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CN108418178A - Excess voltage protection and power-converting device with the excess voltage protection - Google Patents

Excess voltage protection and power-converting device with the excess voltage protection Download PDF

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Publication number
CN108418178A
CN108418178A CN201810288442.9A CN201810288442A CN108418178A CN 108418178 A CN108418178 A CN 108418178A CN 201810288442 A CN201810288442 A CN 201810288442A CN 108418178 A CN108418178 A CN 108418178A
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CN
China
Prior art keywords
voltage
switch
impedance
equipment
power
Prior art date
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Pending
Application number
CN201810288442.9A
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Chinese (zh)
Inventor
佐藤俊彰
矢吹俊生
田口泰贵
三井淳也
森田康平
畑山敬之
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Daikin Industries Ltd
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Daikin Industries Ltd
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Publication of CN108418178A publication Critical patent/CN108418178A/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage

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  • Emergency Protection Circuit Devices (AREA)
  • Protection Of Static Devices (AREA)

Abstract

The present invention provides excess voltage protection and the power-converting device with the excess voltage protection, and protection equipment is not subjected to the excessive voltage of moment, small and inexpensive.In excess voltage protection (50); connecting switch (11) when usual makes bypass resistance (35) be closed; because that without consuming power in impedance circuit (20), can avoid declining the amount of pressure drop in impedance circuit (20) to the application voltage of equipment (30).Also, (11) are switched in overvoltage to disconnect, thus declines the amount of pressure drop of the impedance Z of impedance circuit (20) to the voltage that equipment (30) applies, equipment (30) can be protected to be not subjected to overvoltage.In addition, the 2nd switch (12) cuts off power cord (901), the power consumption of impedance circuit (20) is thus stopped at.As a result, the overheat of impedance circuit (20) can be inhibited, reduce rated power.

Description

Excess voltage protection and power-converting device with the excess voltage protection
The application is the application for a patent for invention (international application no application No. is 201480070190.2：PCT/JP2014/ 084101, the applying date：On December 24th, 2014, denomination of invention：Excess voltage protection and with the excess voltage protection Power-converting device) divisional application.
Technical field
The present invention relates to excess voltage protection and the power-converting device with the excess voltage protection.
Background technology
The equipment used in the region that supply voltage easy tos produce variation no matter voltage rise when countermeasure how, have It may lead to the failure of equipment.Therefore, it is equipped with excessively electric as disclosed in patent document 1 (Japanese Unexamined Patent Publication 2009-207329 bulletins) Voltage protection circuit.It is cut off the power by relay when the excess voltage protection is configured to the voltage as defined in reaching or more.
Invention content
Problems to be solved by the invention
But the time that supply voltage reaches needed for excessive value is extremely short, and cutoff action reaction is carried out above by relay It is slow, it is difficult to reliably to be protected.It is shorter especially for the time that can bear overvoltage as semiconductor element Component, the cut-out based on relay cannot be protected.Also, due to being the excessive voltage of moment, thus by semiconductor element Deng pressure resistance improve can lead to high cost, enlargement.
Therefore, the small and inexpensive mistake of the excessive voltage of moment is not subjected to the subject of the invention is to provide protection equipment Voltage protection circuit and power-converting device with the excess voltage protection.
The means used to solve the problem
The excess voltage protection of the first aspect of the present invention is to be connected to power supply and the equipment from the power source supplies power Between excess voltage protection, the excess voltage protection have impedance circuit, voltage detector, bypass resistance.Impedance electricity Road is connected in series in equipment on the power cord for connecting power supply and equipment.Voltage detector detects the voltage of power supply. Bypass resistance is to bypass the circuit of impedance circuit.Also, bypass resistance has the switch that bypass resistance is disconnected and is closed.Switch Bypass resistance is closed when usual, when the detected value of voltage detector is more than defined threshold value, bypass resistance is cut off.
In the excess voltage protection, bypass resistance is closed when usual, because without being consumed in impedance circuit Power can also avoid the application voltage to equipment from declining the amount of pressure drop in impedance.On the other hand, in overvoltage, to equipment The voltage of application declines the amount of pressure drop in the impedance of impedance circuit, equipment can be protected to be not subjected to overvoltage.
The excess voltage protection of the second aspect of the present invention is the excess voltage protection according to first aspect, also With the 2nd switch that power cord is disconnected and is closed.2nd switch keeps power cord in the conduction state when usual, is examined in voltage When surveying the detected value of device more than defined threshold value, power cord is cut off after switch is acted.
In the excess voltage protection, bypass resistance is closed when usual, because without being consumed in impedance circuit Power can also avoid the application voltage to equipment from declining the amount of pressure drop in impedance circuit.
Also, it switchs and is acted in overvoltage, thus decline the pressure drop in impedance circuit to the voltage that equipment applies Amount, can protect equipment to be not subjected to overvoltage.
In addition, after switch is acted, the 2nd switch, which is acted, cuts off power cord, thus makes in impedance circuit Power consumption stops.As a result, the overheat of impedance can be inhibited, rated power can be reduced.
The excess voltage protection of the third aspect of the present invention is the excess voltage protection according to first aspect, also With the 2nd switch that power cord is disconnected and is closed.2nd switch keeps power cord in the conduction state when usual, is examined in voltage It, will after switch is acted when the detected value of survey device is longer than defined duration decision content more than the time of defined threshold value Power cord is cut off.
In the excess voltage protection, the amount of pressure drop in impedance circuit is declined to the voltage that equipment applies, can be protected Equipment is not subjected to overvoltage.
In addition, after switch is acted, the 2nd switch, which is acted, cuts off power cord, thus makes in impedance circuit Power consumption stops.As a result, the overheat of impedance can be inhibited, rated power can be reduced.
The excess voltage protection of the fourth aspect of the present invention is the excess voltage protection according to first aspect, also The equipment voltage detector of the voltage of equipment is applied to the 2nd switch that power cord is disconnected and is closed and detection.2nd Switch keeps power cord in the conduction state when usual, when the detected value of equipment voltage detector is more than defined 3 threshold value, Power cord is cut off after switch is acted.
In the excess voltage protection, the amount of pressure drop in impedance circuit is declined to the voltage that equipment applies, can be protected Equipment is not subjected to overvoltage.
In addition, after switch is acted, the 2nd switch, which is acted, cuts off power cord, thus stops at impedance circuit Power consumption.As a result, the overheat of impedance can be inhibited, rated power can be reduced.
The excess voltage protection of the fifth aspect of the present invention be connected to power supply with by power supply provide electric power equipment it Between excess voltage protection, the excess voltage protection have variable impedance circuit and voltage detector.Variable impedance circuit It is connected in series on the power cord for connecting power supply and equipment with equipment.Voltage detector detects the voltage of power supply.And And variable impedance circuit voltage detector detected value be more than defined threshold value when, make impedance value be more than it is usual when value.
In the excess voltage protection, impedance value is set to smaller value (including 0) when usual, it is thus possible to press down The power consumption in variable impedance circuit is made, is also reduced in the pressure drop of variable impedance circuit, is inhibited under the application voltage of equipment Amount of pressure drop in variable impedance circuit drops.
On the other hand, impedance value is set to larger value in overvoltage, thus the voltage that equipment applies is declined The amount of pressure drop of variable impedance circuit can protect equipment to be not subjected to overvoltage.
The excess voltage protection of the sixth aspect of the present invention is the excess voltage protection according to the 5th aspect, can Variable resistance reactive circuit makes impedance value continuously change with the variation of the detected value of voltage detector.
In the excess voltage protection, impedance value is set to larger value in overvoltage, thus equipment is applied Voltage decline variable impedance circuit amount of pressure drop, equipment can be protected to be not subjected to overvoltage.
The excess voltage protection of the seventh aspect of the present invention is the excess voltage protection according to the 5th aspect, can Variable resistance reactive circuit makes impedance value change by stages with the variation of the detected value of voltage detector.
In the excess voltage protection, impedance value is set to larger value in overvoltage, thus equipment is applied Voltage decline variable impedance circuit amount of pressure drop, equipment can be protected to be not subjected to overvoltage.
The excess voltage protection of the eighth aspect of the present invention is the excess voltage protection according to the 5th aspect, can Variable resistance reactive circuit selectively uses multiple impedors.Multiple impedors include the 1st impedor and the 2nd impedor. 1st impedor has the 1st impedance value.2nd impedor has 2nd impedance value bigger than the 1st impedance value.Variable impedance circuit When using 1 impedor, when the detected value of voltage detector is more than defined threshold value, by the impedor used from the 1 impedor is switched to the 2nd impedor.
In the excess voltage protection, 1st impedor smaller with impedance value is connect when usual, it is thus possible to be pressed down The power consumption in impedance circuit is made, is also reduced in the pressure drop of impedance circuit, also inhibits the application voltage to equipment to decline and is hindering The amount of pressure drop of reactive circuit.
On the other hand, 2nd impedor larger with impedance value in overvoltage is connect, thus to the voltage of equipment application Decline the amount of pressure drop in impedance circuit, equipment can be protected to be not subjected to overvoltage.
The excess voltage protection of the ninth aspect of the present invention is according to any one aspect institute in five~eighth aspect The excess voltage protection stated also has the 2nd switch that power cord is disconnected and is closed.2nd switch makes power cord when usual It is in the conduction state, power cord is cut off when the detected value of voltage detector is more than defined 2 threshold value.
In the excess voltage protection, the 2nd switch, which is acted, cuts off power cord, thus stops at impedance circuit Power consumption.As a result, the overheat of impedance can be inhibited, rated power can be reduced.
The excess voltage protection of the tenth aspect of the present invention is according to any one aspect institute in five~eighth aspect The excess voltage protection stated also has the 2nd switch that power cord is disconnected and is closed.2nd switch makes power cord when usual It is in the conduction state, it is longer than defined duration decision content more than the time of defined threshold value in the detected value of voltage detector When, power cord is cut off.
In the excess voltage protection, the 2nd switch, which is acted, cuts off power cord, thus stops at impedance circuit Power consumption.As a result, the overheat of impedance can be inhibited, rated power can be reduced.
The excess voltage protection of the eleventh aspect of the present invention is according to any one aspect in five~eighth aspect Also there is the excess voltage protection the 2nd switch that power cord is disconnected and is closed and detection to be applied to the electricity of equipment The equipment voltage detector of pressure.2nd switch keeps power cord in the conduction state when usual, in the detection of equipment voltage detector Value cuts off power cord when being more than defined 3 threshold value.
In the excess voltage protection, the 2nd switch, which is acted, cuts off power cord, thus stops at impedance circuit Power consumption.As a result, the overheat of impedance can be inhibited, rated power can be reduced.
The excess voltage protection of the twelveth aspect of the present invention is according to any one side in the first~the tenth one side Excess voltage protection described in face, power supply are AC power supplies.
In the excess voltage protection, when the service voltage even from AC power supplies is excessive voltage, equipment is applied The voltage added also declines the amount of pressure drop in impedance circuit.It therefore, there is no need to protect just to the excessive voltage to the short time The voltage rating of shield and design raising equipment, it is relatively more reasonable.
The excess voltage protection of the thirteenth aspect of the present invention is according to any one side in the first~the tenth one side Excess voltage protection described in face, power supply are DC power supplies.
In the excess voltage protection, the switch for exchanging switched on and off is needed to be amphicheirality, but in DC power supply Downstream side configuration switch can also be single-way switch, it is thus possible to realize the cost effective of switch.
The power-converting device of the fourteenth aspect of the present invention has converter circuit, inverter circuit and the first~the Excess voltage protection in ten aspects described in any one aspect.Converter circuit is connect with AC power, by alternating voltage It is transformed to DC voltage.DC voltage conversion is alternating voltage by inverter circuit.
In the power-converting device, excess voltage protection can protect converter circuit to be not subjected to the mistake that transition applies Big alternating voltage, or protection inverter circuit are not subjected to the excessive DC voltage of transition application.
The fifteenth aspect of the present invention provides a kind of excess voltage protection of refrigerating plant, is connected to AC power Between the equipment by power supply offer electric power, the excess voltage protection has：
Impedance circuit is connected in series in the power cord for connecting the power supply and the equipment with the equipment On；
Voltage detector detects the voltage of the power supply；And
Bypass resistance bypasses the impedance circuit,
The bypass resistance has disconnects and connects the two-way of alternating current to disconnect and be closed the bypass resistance Switch,
The bypass resistance is closed by the switch when usual, is more than defined in the detected value of the voltage detector When threshold value, the bypass resistance is cut off.
The sixteenth aspect of the present invention provides a kind of power-converting device, has：
The excess voltage protection that the fifteenth aspect of the present invention is recorded；
The voltage transformation of the AC power is DC voltage by converter circuit；And
The DC voltage conversion is alternating voltage by inverter circuit.
Invention effect
In the excess voltage protection of the first aspect of the present invention, bypass resistance is closed when usual, because without Power is consumed in impedance circuit, and the application voltage to equipment can also be avoided to decline the amount of pressure drop in impedance.On the other hand, exist When overvoltage, the amount of pressure drop in the impedance of impedance circuit is declined to the voltage that equipment applies, equipment can be protected to be not subjected to electricity Pressure.
In the excess voltage protection of the second aspect of the present invention, bypass resistance is closed when usual, because without Power is consumed in impedance circuit, and the application voltage to equipment can also be avoided to decline the amount of pressure drop in impedance circuit.
Also, it switchs and is acted in overvoltage, thus decline the pressure drop in impedance circuit to the voltage that equipment applies Amount, can protect equipment to be not subjected to overvoltage.
In addition, after switch is acted, the 2nd switch, which is acted, cuts off power cord, thus stops at impedance circuit Power consumption.As a result, the overheat of impedance can be inhibited, rated power can be reduced.
In the excess voltage protection of the third aspect of the present invention and fourth aspect, the voltage that equipment applies is declined The amount of pressure drop of impedance circuit can protect equipment to be not subjected to overvoltage.In addition, after switch is acted, the 2nd switchs into action Work cuts off power cord, thus stops at the power consumption of impedance circuit.As a result, the rated power of impedance can be reduced.
In the excess voltage protection of the fifth aspect of the present invention, impedance value is set to smaller value when usual (including 0), it is thus possible to inhibit the power consumption in variable impedance circuit, also reduce in the pressure drop of impedance circuit, inhibition pair is set Standby application voltage declines the amount of pressure drop in impedance circuit.
On the other hand, impedance value is set to larger value in overvoltage, thus the voltage that equipment applies is declined The amount of pressure drop of impedance circuit can protect equipment to be not subjected to overvoltage.
In the excess voltage protection of the sixth aspect of the present invention and the 7th aspect, impedance value is set in overvoltage At larger value, thus the amount of pressure drop in impedance circuit is declined to the voltage that equipment applies, equipment can be protected to be not subjected to electricity Pressure.
In the excess voltage protection of the eighth aspect of the present invention, when usual with the 1st smaller impedance element of impedance value Part connects, it is thus possible to inhibit the power consumption in impedance circuit, also reduce in the pressure drop of impedance circuit, also inhibit to equipment Application voltage declines the amount of pressure drop in impedance circuit.
On the other hand, 2nd impedor larger with impedance value in overvoltage is connect, thus to the voltage of equipment application Decline the amount of pressure drop in impedance circuit, equipment can be protected to be not subjected to overvoltage.
In excess voltage protection in the 9th~the tenth one side of the present invention in terms of any one, the 2nd switch into Action is made to cut off power cord, thus stops the power consumption in impedance circuit.As a result, the mistake of impedance can be inhibited Heat can reduce rated power.
In the excess voltage protection of the twelveth aspect of the present invention, the service voltage even from AC power supplies was When big voltage, the voltage applied to equipment also declines the amount of pressure drop in impedance circuit.It therefore, there is no need to just to the short time Excessive voltage protected and design the voltage rating for improving equipment, it is relatively reasonable.
It is double by switched on and off switch needs are exchanged in the excess voltage protection of the thirteenth aspect of the present invention Tropism, but can also be single-way switch in the switch of the downstream side of DC power supply configuration, it is thus possible to realize the low cost of switch Change.
In the excess voltage protection of the fourteenth aspect of the present invention, excess voltage protection can protect current transformer electric Road is not subjected to the excessive alternating voltage of transition application, or protection inverter circuit is not subjected to the excessive direct current of transition application Pressure.
Description of the drawings
Fig. 1 is the circuit diagram of the device of the excess voltage protection of the 1st embodiment with the present invention.
Fig. 2 is the circuit diagram of voltage detector.
Fig. 3 is the curve graph of the variation of voltage V when to show impedance only be resistance.
Fig. 4 is the curve graph for the variation for showing voltage V when impedance includes inductance ingredient.
Fig. 5 is the circuit diagram of the device of the excess voltage protection of the 2nd embodiment with the present invention.
Fig. 6 is the curve graph of the variation of voltage V when to show impedance only be resistance.
Fig. 7 is the circuit diagram of the power-converting device of the excess voltage protection of the 3rd embodiment with the present invention.
Fig. 8 is the circuit diagram of the power-converting device of the excess voltage protection of the 4th embodiment with the present invention.
Fig. 9 is the curve graph of the variation of voltage V when to show impedance only be resistance.
Figure 10 is the curve graph of the variation of voltage V when to show impedance only be resistance.
Figure 11 is the circuit diagram of the power-converting device of the excess voltage protection with another variation.
Figure 12 is the circuit diagram of the device of the excess voltage protection of the 5th embodiment with the present invention.
Figure 13 is the curve graph for the variation for showing impedance only and be voltage V when variable resistance and impedance value increase continuously.
Figure 14 is the song for the variation for showing impedance only and be voltage V when variable resistance and impedance value increase by stages Line chart.
Figure 15 is the circuit diagram of the device of the excess voltage protection of the 6th embodiment with the present invention.
Figure 16 is the curve graph of the variation of voltage V when to show impedance only be resistance.
Figure 17 is the circuit diagram of the device of the excess voltage protection of the 7th embodiment with the present invention.
Figure 18 is the curve graph of the variation of voltage V when to show impedance only be resistance.
Figure 19 is the circuit diagram of the device of the excess voltage protection of the 8th embodiment with the present invention.
Figure 20 is the curve graph of the variation of voltage V when to show impedance only be resistance.
Figure 21 is the circuit diagram of the power-converting device of the excess voltage protection of the 9th embodiment with the present invention.
Figure 22 is the circuit diagram of the power-converting device of the excess voltage protection of the 10th embodiment with the present invention.
Figure 23 is the circuit diagram of the device of the excess voltage protection with another variation.
Figure 24 is the curve graph of the variation of voltage V when to show impedance only be resistance.
Specific implementation mode
In the following, being described with reference to embodiments of the present invention.In addition, following embodiment is the specific of the present invention Example cannot limit the technical scope of the present invention.
<1st embodiment>
(1) structure of excess voltage protection 50
Fig. 1 is the circuit diagram of the device of the excess voltage protection 50 of the 1st embodiment with the present invention.In Fig. 1, Equipment 30 is powered from source power supply 90 via a pair of of power cord 901,902.Excess voltage protection 50 is connected to source power supply Between 90 and equipment 30.
Excess voltage protection 50 includes impedance circuit 20, voltage detector 33, bypass resistance 35.
(2) concrete structure of excess voltage protection 50
(2-1) impedance circuit 20
Impedance circuit 20 is configured to make the circuit that the ratio between voltage and electric current in the circuit i.e. impedance value reach Z.
Impedance circuit 20 is connected on power cord 90 between source power supply 90 and equipment 30.
(2-2) voltage detector 33
Voltage detector 33 is made of ac voltage detection circuit.There are many ac voltage detection circuits, according to using item Part and suitably use.For example, Fig. 2 is the circuit diagram of general voltage detector 33.In fig. 2, voltage detector 33 is by transformation Circuit 331 and converter circuit 332 are constituted.
Transforming circuit 331 is located at input side, is made of first side winding 331a and secondary side winding 331b.
Converter circuit 332 is that the rectification part 332a that will be made of rectifier diode and smoothing capacity device 332b parallel connections connect Connect the circuit of composition.
In voltage detector 33, when applying alternating voltage to transforming circuit 331, alternating voltage passes through transforming circuit 331 and transformation.Also, the both end voltage of secondary side winding 331b is input to converter circuit 332.
It is input to the alternating voltage after the transformation of converter circuit 332 and is transformed to DC voltage in rectification part 332a, Smoothing capacity device 332b is smoothed.The DC voltage after smooth is entered control unit 40.That is, with first side winding is applied to The corresponding DC voltage of voltage of 331a is input to control unit 40.
(2-3) bypass resistance 35
Bypass resistance 35 is connected in parallel with impedance circuit 20 and around the circuit of impedance circuit 20.Bypass resistance 35 has There is switch 11.Bypass resistance 35 is disconnected and is closed (Open Closed by switch 11).Wherein, it is to instigate bypass resistance 35 to be disconnected and is closed Bypass resistance 35 is switched on or off and is in not on-state.
(2-4) switch 11
Bypass resistance 35 is closed in the conduction state by switch 11 when usual.Because if will bypass electricity when usual Road 35 is set as disconnecting (not on-state), and impedance circuit 20 is in the state connected always and consumes power always, to equipment 30 Apply voltage will decline impedance circuit 20 impedance Z amount of pressure drop.
On the other hand, in order in overvoltage protect equipment 30, need as early as possible by bypass resistance 35 disconnect and by impedance electricity Road 20 connects, and constitutes the closed-circuit of source power supply 90- equipment 30- impedance circuit 20- source power supplies 90.It is therefore desirable to switch 11 high speed motions.
Switch 11 is using bidirectional triode thyristor, the MOSFET etc. connected to bidirectional conduction.In the present embodiment, using photoelectricity Bidirectional triode thyristor coupler.
As shown in Figure 1, switch 11 input side (between A1-A2) be equipped with light emitting diode 11a, outlet side (B1-B2 it Between) it is equipped with photoelectricity bidirectional triode thyristor 11b.The equivalent circuit of photoelectricity bidirectional triode thyristor 11b is by two photoelectricity thyristors 111,112 It is oppositely connected in parallel to constitute each other.
The anode A 1 of light emitting diode 11a is connect via resistance R1 with power supply Vc.Also, the cathode of light emitting diode 11a A2 is connect via signal wire with control unit 40.
The 1st anode B1 of photoelectricity bidirectional triode thyristor 11b be connected to impedance circuit 20 in power cord 902 and equipment 30 it Between.Also, the 2nd anode B2 of photoelectricity bidirectional triode thyristor 11b is connected to impedance circuit 20 and source power supply 90 in power cord 902 Between.
Light emitting diode 11a shines when electric current flows through.Photoelectricity bidirectional triode thyristor 11b is big when the current potential in the 1st anode B1 When receiving the light from light emitting diode 11a in the state of the current potential of the 2nd anode B2, photoelectricity thyristor 111, which is in, to be connected State.On the other hand, carry out self-luminous two when being received in the state of current potential of the current potential of the 1st anode B1 less than the 2nd anode B2 When the light of pole pipe 11a, photoelectricity thyristor 112 is in an ON state.
In this way, photoelectricity bidirectional triode thyristor 11b is the bilateral element acted to two-way application voltage, and it is high speed Action, thus it is used as two-way high-speed switch.
In addition, two-way high-speed switch is not limited to photoelectricity bidirectional triode thyristor, can also use common bidirectional triode thyristor and The MOSFET etc. connected to bidirectional conduction.It is appropriate to use and the switch in the case of high-speed switch taken other form The corresponding driving circuit of form.
Also, the action control of switch 11 is carried out the power control of light emitting diode 11a by control unit 40.
(3) action of excess voltage protection 50
Fig. 3 is the curve for the variation for showing the voltage V when impedance of equipment 30 be only resistance components, impedance Z is only resistance Figure.In figures 1 and 3, bypass resistance 35 thus applies equipment 30 because that switch 11 is closed is in the conduction state when usual Voltage V=Vac.
It is sharply increased in the voltage Vac of source power supply 90, control unit 40 is determined as the voltage exported from voltage detector 33 When more than threshold value, control unit 40 stops the energization to the light emitting diode 11a of switch 11, and photoelectricity bidirectional triode thyristor 11b is made to disconnect. In addition, in order to protect equipment 30, it is desirable that 11 high speed motion of switch.
As a result, constituting the closed-circuit of source power supply 90- equipment 30- impedance circuit 20- source power supplies 90.At this point, Voltage V=Vac-Vz can only be applied to equipment 30.As a result, protection equipment 30 is not subjected to overvoltage.In addition, when in switch 11 In the case that voltage Vac also rises after disconnection, voltage V rises also with the rising.
Fig. 4 is the curve graph for the variation for showing voltage V when impedance Z includes inductance ingredient.In Fig. 4, when usual pair Equipment 30 applies voltage V=Vac.Reach the maximum overvoltage value for example with Fig. 3 in the voltage Vac momentary variations of source power supply 90 Identical value, when control unit 40 makes switch 11 disconnect, the rising of the voltage V after the disconnection of switch 11 and impedance Z are only resistance phases Than being slowly to rise.
Therefore, supply voltage easy to produce variation, long-term sustained overvoltage region in, it is preferred to use impedance Z includes The component of inductance ingredient.
Decline in the voltage Vac of source power supply 90, control unit 40 is determined as the voltage return exported from voltage detector 33 And when less than threshold value, control unit 40 is powered to the light emitting diode 11a of switch 11, and photoelectricity bidirectional triode thyristor 11b is made to connect.By This, reverts to common action.
The feature of (4) the 1st embodiments
(4-1) in excess voltage protection 50, make when usual switch 11 connection bypass resistance 35 is closed, because without Power can be consumed in impedance circuit 20, can also avoid applying pressure drop of the voltage decline in impedance circuit 20 to equipment 30 Amount.
(4-2) also, in overvoltage, switch 11 disconnects, and thus declines the voltage that equipment 30 applies in impedance circuit The amount of pressure drop of 20 impedance Z, protection equipment 30 are not subjected to overvoltage.
(4-3) declines the voltage that equipment 30 applies when the service voltage from source power supply 90 is excessive voltage The amount of pressure drop of impedance circuit 20.It therefore, there is no need to be protected just to the excessive voltage to the short time and design raising and set Standby 30 voltage rating, it is relatively more reasonable.
<2nd embodiment>
(1) structure of excess voltage protection 50
Fig. 5 is the circuit diagram of the device of the excess voltage protection 50 of the 2nd embodiment with the present invention.In Figure 5, Equipment 30 is powered from source power supply 90 via a pair of of power cord 901,902.Excess voltage protection 50 is connected to source power supply Between 90 and equipment 30.
Excess voltage protection 50 includes impedance circuit 20, voltage detector 33, bypass resistance 35 and the 2nd switch 12.
(2) concrete structure of excess voltage protection 50
2nd embodiment is that the mode of the 2nd switch 12 composition has been added to the 1st embodiment, impedance circuit 20, voltage inspection It surveys device 33 and bypass resistance 35 uses identical structure.Therefore, only the 2nd switch 12 is illustrated herein.
(2-1) the 2nd switch 12
Power cord 901 is disconnected and is closed by the 2nd switch 12.Wherein, it refers to by power cord power cord 901 to be disconnected and is closed 901 conductings or cut-out make to be in not on-state.
Power cord 901 is closed in the conduction state by the 2nd switch 12 when usual.On the other hand, it in overvoltage, opens It closes 11 to disconnect, constitutes the closed-circuit of source power supply 90- equipment 30- impedance circuit 20- source power supplies 90, carrying out equipment 30 Protection act after, the 2nd switch 12 disconnect, power cord 901 is disconnected.
It is that can reduce impedance electricity to stop at the power consumption of impedance circuit 20 by the purpose that power cord 901 disconnects The rated power on road 20 can be realized cost effective.
2nd switch 12 does not require the high speed as switch 11, thus uses relay circuit in the present embodiment.
As shown in figure 5, the 2nd switch 12 includes by relay tip 12a that power cord 901 is disconnected and is closed, makes relay Relay coil 12b that contact 12a is acted, relay coil 12b be powered and cold transistor 12c.After One end of electric apparatus coil 12b is connect with the anode of power supply Vb, and the other end is connect with the collector side of transistor 12c.Control unit 40 The presence or absence of the base current of switching transistor 12c, will be switched on and off between collector and emitter, to relay coil 12b Carry out energization and no power.
(3) action of excess voltage protection 50
Fig. 6 is the curve graph of the variation of voltage V when to show impedance Z only be resistance.In Fig. 5 and Fig. 6, when usual by Circuit passband 35 is because that switch 11 is closed is in the conduction state, and the 2nd switch 12 keeps power cord 901 in the conduction state, thus Voltage V=Vac is applied to equipment 30.
It is sharply increased in the voltage Vac of source power supply 90, control unit 40 is determined as the voltage exported from voltage detector 33 When more than threshold value, control unit 40 stops the energization to the light emitting diode 11a of switch 11, and photoelectricity bidirectional triode thyristor 11b is made to disconnect.
As a result, constituting the closed-circuit of source power supply 90- equipment 30- impedance circuit 20- source power supplies 90.At this point, Voltage V=Vac-Vz can only be applied to equipment 30.As a result, protection equipment 30 is not subjected to overvoltage.
Then, in the case where overvoltage condition continues, rise with the voltage Vac of source power supply 90, be applied to equipment 30 voltage V also rises.But when voltage Vac reaches 2 threshold value, the 2nd switch 12 disconnects power cord 901.Its result It is to protect equipment 30, and stop at the power consumption of impedance circuit 20.
In the case where impedance Z includes inductance ingredient, increase in the voltage Vac of source power supply 90 and control unit 40 makes switch When 11 disconnection, the rising of the voltage V after the disconnection of switch 11 is slowly to rise compared with when impedance Z is only resistance.
Therefore, when postponing deenergization line 901 even by the 2nd switch 12, damage is when also specific impedance Z is only resistance It is small.That is, in the state that even the rated power of impedance Z is smaller, equipment 30 can also be protected to be not subjected to the overvoltage of short time.
Decline in the voltage Vac of source power supply 90, control unit 40 is determined as that the voltage exported from voltage detector 33 is less than When threshold value for recovery, control unit 40 is powered to the light emitting diode 11a of switch 11, and photoelectricity bidirectional triode thyristor 11b is made to connect. In addition, the 2nd switch 12 is made to connect, power cord 901 is connected, common action is thus reverted to.
The feature of (4) the 2nd embodiments
(4-1) makes switch 11 connect and be closed bypass resistance 35 in excess voltage protection 50 when usual, thus Power will not be consumed in impedance circuit 20, can also avoid applying pressure drop of the voltage decline in impedance circuit 20 to equipment 30 Amount.
(4-2) also, in overvoltage, switch 11 disconnects, and thus declines the voltage that equipment 30 applies in impedance circuit The amount of pressure drop of 20 impedance Z, protection equipment 30 are not subjected to overvoltage.
(4-3) also, the 2nd switch 12 disconnect power cord 901, thus stop at the power consumption of impedance circuit 20.Its As a result, it is possible to inhibit the overheat of impedance circuit 20, reduce rated power.
(4-4) declines the voltage that equipment 30 applies when the service voltage from source power supply 90 is excessive voltage The amount of pressure drop of impedance circuit 20.It therefore, there is no need to be protected just to the excessive voltage to the short time and design raising and set Standby 30 voltage rating, it is relatively more reasonable.
<3rd embodiment>
(1) structure of power-converting device 300
Fig. 7 is the electricity of the power-converting device 300 of the excess voltage protection 100 of the 3rd embodiment with the present invention Lu Tu.In the figure 7, power-converting device 300 is made of DC power portion 80, inverter 95, excess voltage protection 100.
Inverter 95 is powered from DC power portion 80 via a pair of of power cord 801,802.Excess voltage protection 100 connects It is connected between DC power portion 80 and inverter 95.
(1-1) DC power portion 80
DC power portion 80 is made of rectification part 81 and the smoothing capacity device being connected in parallel with rectification part 81 82.
Rectification part 81 is configured to bridge like by 4 diodes D1a, D1b, D2a, D2b.Specifically, diode D1a and D1b, D2a and D2b connections in series with each other.The respective cathode terminal of diode D1a, D2a all with the positive side of smoothing capacity device 82 Son connection, the positive side leading-out terminal as rectification part 81 play a role.Each anode tap of the respective diode of diode D1b, D2b Son is all connect with the negative side terminal of smoothing capacity device 82, and the negative side leading-out terminal as rectification part 81 plays a role.
The tie point of diode D1a and diode D1b are connect with a pole of source power supply 90.Diode D2a and two poles The tie point of pipe D2b is connect with another pole of source power supply 90.Rectification part 81 is to the alternating voltage that is exported from source power supply 90 It carries out rectification and generates direct current, and direct current is supplied to smoothing capacity device 82.
Smoothing capacity device 82 by the voltage after 81 rectification of rectification part to being smoothed.Voltage Vdc after will be smooth is applied Add to the inverter 95 being connect with the outlet side of smoothing capacity device 82.
In addition, the type about capacitor, can enumerate electrolytic capacitor and thin film capacitor, Tantal condenser etc., In present embodiment, smoothing capacity device 82 uses electrolytic capacitor.
The DC power portion 80 can also be known as alternating voltage being transformed to the converter circuit of DC voltage.
(1-2) inverter 95
Inverter 95 includes multiple IGBT (insulated gate polar form bidirectional transistor, hereinafter referred to as transistor) and multiple reflux Use diode.Inverter 95 is applied to the voltage Vdc from smoothing capacity device 82, and is being indicated by gate driving circuit 96 Timing carries out the switched on and off of each transistor, thus generates the driving voltage of driving motor 500.Motor 500 is, for example, heat pump Compressor electric motor, the fan electromotor of formula air conditioner.
In addition, the inverter 95 of present embodiment is voltage source inverter, but not limited to this, can also be current mode inversion Device.
(1-3) gate driving circuit 96
Gate driving circuit 96 makes the switched on and off of each transistor of inverter 95 according to the instruction from control unit 40 State change.
(1-4) excess voltage protection 100
Excess voltage protection 100 includes impedance circuit 70, voltage detector 83, bypass resistance 85, the 2nd switch 62.
(2) concrete structure of excess voltage protection 100
3rd embodiment and the 1st embodiment having been described above and the 2nd embodiment it is maximum the difference is that, mistake Voltage protection circuit 100 is located at direct current portion.Therefore, direct-current ratings also are replaced with from exchange specification in view of each integral part, Even identical title, also replaces label and illustrate again.
(2-1) impedance circuit 70
Impedance circuit 70 is configured to make the circuit that the ratio between voltage and current in the circuit i.e. impedance value reaches Z.Usually adopt Use resistive element.
Impedance circuit 70 is connected on power cord 802 between DC power portion 80 and inverter 95.
(2-2) voltage detector 83
Voltage detector 83 is connect with the outlet side of smoothing capacity device 82, and the both end voltage of detection smoothing capacity device 82 is i.e. flat The value of voltage Vdc after cunning.Voltage detector 83 is for example configured to will be connected in series with each other two resistance and smoothing capacity devices 82 are connected in parallel, and are divided to voltage Vdc.By the voltage value input control portion 40 of the mutual tie point of the two resistance.
(2-3) bypass resistance 85
Bypass resistance 85 is connected in parallel with impedance circuit 70 and around the circuit of impedance circuit 70.Bypass resistance 85 has There is switch 61.Bypass resistance 85 is disconnected and is closed by switch 61.Wherein, bypass resistance 85 is disconnected and is closed is to instigate bypass electricity Road 85 is connected or cuts off and be in not on-state.
(2-4) switch 61
Bypass resistance 85 is closed in the conduction state by switch 61 when usual.Because if will bypass electricity when usual Road 85 be set as disconnect (not on-state), consume power always in impedance circuit 70, to the application voltage of inverter 95 will under The amount of pressure drop of the impedance Z of impedance circuit 70 drops.
On the other hand, it in order to protect inverter 95 in overvoltage, needs as early as possible to disconnect bypass resistance 85, constitutes direct current The closed-circuit of power supply unit 80- inverter 95- impedance circuit 70- DC power portions 80.It is therefore desirable to 61 high speed motion of switch. Transistor, the mode of switch 61 is used to be not limited to present embodiment in the present embodiment.
As shown in fig. 7, switch 61 is made of photo-coupler 61a, driving circuit 61b, transistor 61c.In photo-coupler 61a Light emitting diode 611 and phototransistor 612 are set.
The input side (between C1-C2) of switch 61 is connect with the light emitting diode 611 of photo-coupler 61a.Light emitting diode 611 positive C 1 is connect via resistance R1 with power supply Vc.The cathode C2 of light emitting diode 611 connects via signal wire and control unit 40 It connects.Also, phototransistor 612 is connected between driving circuit 61b and ground.
It is equipped with transistor 61c in the outlet side (between D1-D2) of switch 61.The collector D1 of transistor 61c is connected to resistance Between reactive circuit 70 and inverter 95.Also, the emitter D2 of transistor 61c is connected to impedance circuit 70 and DC power portion 80 Between.
The control signal of control unit 40 is input into driving circuit 61b via photo-coupler 61a.Driving circuit 61b and drive Power supply connection (not shown) is employed, when control unit 40 makes the signal wire of light emitting diode 611 connect, light emitting diode 611 is sent out Light, phototransistor 612 are connected.During the phototransistor 612 is connected, from driving circuit 61b to the base of transistor 61c Pole output drive signal is connected between the collector D1- emitters D2 of transistor 61c.
On the contrary, when control unit 40 disconnects the signal wire of light emitting diode 611, light emitting diode 611 does not shine, thus Phototransistor 612 is not turned on.During the phototransistor 612 is not turned on, the collector D1- emitters of transistor 61c It is also not turned between D2.
(2-5) the 2nd switch 62
Power cord 801 is disconnected and is closed by the 2nd switch 62.Wherein, it refers to by power cord power cord 801 to be disconnected and is closed 801 be switched on or off make be in not on-state.
Power cord 801 is closed in the conduction state by the 2nd switch 62 when usual.On the other hand, it in overvoltage, opens It closes 61 to disconnect, constitutes the closed-circuit of DC power portion 80- impedance circuit 70- DC power portions 80, carrying out inverter 95 Protection act after, the 2nd switch 62 disconnect, power cord 801 is disconnected.
It is that can reduce impedance electricity to stop at the power consumption of impedance circuit 70 by the purpose that power cord 801 disconnects The rated power on road 70 can be realized cost effective.
2nd switch 62 does not require the high speed as switch 61, thus uses relay circuit in the present embodiment.
As shown in fig. 7, the 2nd switch 62 includes by relay tip 62a that power cord 801 is disconnected and is closed, makes relay Relay coil 62b that contact 62a is acted, relay coil 62b be powered and cold transistor 62c.After One end of electric apparatus coil 62b is connect with the anode of power supply Vb, and the other end is connect with the collector side of transistor 62c.Control unit 40 The presence or absence of the base current of switching transistor 62c, will be switched on and off between collector and emitter, to relay coil 62b Carry out energization and no power.
(3) action of excess voltage protection 100
In the figure 7, bypass resistance 85 is because that switch 61 is closed is in the conduction state when usual, and the 2nd switch 62 makes Power cord 801 is in the conduction state, thus applies voltage V=Vdc to inverter 95.
When the voltage Vdc of DC power portion 80 is sharply increased, control unit 40 is determined as the electricity exported from voltage detector 83 When pressure is more than threshold value, control unit 40 stops the energization to the light emitting diode 611 of switch 61, and phototransistor 612 is made to disconnect.
As a result, constituting the closed-circuit of DC power portion 80- inverter 95- impedance circuit 70- DC power portions 80. At this point, voltage V=Vdc-Vz can only be applied to inverter 95.As a result, protection inverter 95 is not subjected to overvoltage.
Then, in the case where overvoltage condition continues, the 2nd switch 62 cuts off power cord 801, stops at impedance circuit 70 power consumption.
Decline in the voltage Vac of source power supply 90, control unit 40 is determined as that the voltage exported from voltage detector 83 is less than When threshold value for recovery, control unit 40 is powered to the light emitting diode 611 of switch 61, and transistor 61c is made to connect.Also, make 2nd switch 62 is connected and connects power cord 801, and common action is thus reverted to.
The feature of (4) the 3rd embodiments
The connection of switch 61 is made bypass resistance 85 be closed by (4-1) in excess voltage protection 100 when usual, thus Power will not be consumed in impedance circuit 70, and the application voltage to inverter 95 can also be avoided to decline the pressure in impedance circuit 70 Drop amount.
(4-2) also, switch 61 disconnects in overvoltage, and the voltage thus applied to inverter 95 has dropped impedance circuit The amount of pressure drop of 70 impedance Z, thus inverter 95 is protected to be not subjected to overvoltage.
(4-3) thus stops at the power consumption of impedance circuit 70 in addition, the 2nd switch 62 cuts off power cord 801.Its As a result, it is possible to reduce the rated power of impedance circuit 70.
(4-4) is in addition, the switch 61 configured in the downstream side of DC power portion 80 can be single-way switch, it is thus possible to real What is now switched is cost effective.
<4th embodiment>
(1) structure of excess voltage protection 100
Fig. 8 is the electricity of the power-converting device 300 of the excess voltage protection 100 of the 4th embodiment with the present invention Lu Tu.In fig. 8, inverter 95 is powered from DC power portion 80 via a pair of of power cord 801,802.Excess voltage protection 100 part is connected between source power supply 90 and DC power portion 80, and other parts are connected to DC power portion 80 and inverse Become between device 95.
Excess voltage protection 100 included impedance circuit 70, voltage detector 33, bypass resistance 85, the 2nd switch 12.
4th embodiment and the 3rd embodiment that has been described above the difference is that, as excess voltage protection The voltage detector of 100 inscape and the 2nd switch are set between source power supply 90 and DC power portion 80.That is, voltage is examined The configuration of survey device and the 2nd switch is identical as the voltage detector 33 in the 2nd embodiment and the configuration of the 2nd switch 12.Therefore, it reflects Exchange specification also is replaced with from direct-current ratings in voltage detector and the 2nd switch, using the voltage detecting in the 2nd embodiment Device 33 and the 2nd switch 12.
Therefore, the content of each integral part and the voltage detector 33 in the 2nd embodiment and the implementation of the 2nd switch the 12, the 3rd The impedance circuit 70 and bypass resistance 85 of mode are identical, thus in this description will be omitted, only carry out action specification.
(2) action of excess voltage protection 100
In fig. 8, bypass resistance 85 is because that switch 61 is closed is in the conduction state when usual, and the 2nd switch 12 makes Power cord 901 is in the conduction state, thus applies voltage V=Vdc to inverter 95.
Due to the variation of the voltage Vac of source power supply 90, the voltage Vdc of DC power portion 80 drastically changes and reached electricity When pressure, control unit 40 is determined as that the voltage exported from voltage detector 33 is more than threshold value, and stops the light-emitting diodes to switch 61 The energization of pipe 611 makes transistor 61c disconnect.
As a result, constituting the closed-circuit of DC power portion 80- inverter 95- impedance circuit 70- DC power portions 80. At this point, voltage V=Vdc-Vz can only be applied to inverter 95.As a result, protection inverter 95 is not subjected to overvoltage.
Then, the 2nd switch 12 cuts off power cord 901, stops at the power consumption of impedance circuit 70.
The feature of (3) the 4th embodiments
Switch 61 is connected when usual in excess voltage protection 100 and bypass resistance 85 is made to be closed by (3-1), because Without consuming power in impedance circuit 70, the application voltage to inverter 95 can also be avoided to decline in impedance circuit 70 Amount of pressure drop.
(3-2) also, switch 61 disconnects in overvoltage, and the voltage thus applied to inverter 95 has dropped impedance circuit The amount of pressure drop of 70 impedance Z, thus inverter 95 is protected to be not subjected to overvoltage.
(3-3) thus stops at the power consumption of impedance circuit 70 in addition, the 2nd switch 12 cuts off power cord 901.Its As a result, it is possible to inhibit the overheat of impedance circuit 70, reduce rated power.
(3-4) is in addition, the switch 61 configured in the downstream side of DC power portion 80 can be single-way switch, it is thus possible to real What is now switched is cost effective.
<Variation>
(A) excess voltage protection 50 of the 1st embodiment shown in FIG. 1 is with the overvoltage protection for alternating voltage Circuit is embodiment, and has in the case where power supply is DC power supply or in equipment and carry out rectification to alternating current In the case of DC power portion, each integral part can also be replaced with direct-current ratings from exchange specification and be set to DC power portion Downstream side.
(B) in the 2nd embodiment, reach in voltage Vac as defined in 2 threshold value when, the 2nd switch 12 is by power cord 901 Cut-out, can also be to be cut off when overvoltage condition have passed through the defined duration.
Fig. 9 is the curve graph of the variation of voltage V when to show impedance Z only be resistance.In Fig. 5 and Fig. 9, when usual by Circuit passband 35 is because that switch 11 is closed is in the conduction state, and the 2nd switch 12 keeps power cord 901 in the conduction state, thus Voltage V=Vac is applied to equipment 30.
It is sharply increased in the voltage Vac of source power supply 90, control unit 40 is determined as the voltage exported from voltage detector 33 When more than threshold value, control unit 40 stops the energization to the light emitting diode 11a of switch 11, and photoelectricity bidirectional triode thyristor 11b is made to disconnect.
As a result, constituting the closed-circuit of source power supply 90- equipment 30- impedance circuit 20- source power supplies 90.At this point, Voltage V=Vac-Vz can only be applied to equipment 30.As a result, protection equipment 30 is not subjected to overvoltage.
Then, in the case where overvoltage condition continues, rise with the voltage Vac of source power supply 90, be applied to equipment 30 voltage V also rises, when the overvoltage condition from voltage Vac is more than threshold value reaches defined duration decision content, 2nd switch 12 cuts off power cord 901.As a result, protection equipment 30, and the power consumption in impedance circuit 20 is made to stop Only.
(C) in the 2nd embodiment, reach in voltage Vac as defined in 2 threshold value when, the 2nd switch 12 is by power cord 901 Cut-out, can also be the equipment voltage detector 37 for also setting up the voltage V that detection is applied to equipment, reach defined in voltage V (Figure 11 shows circuit diagram at this time) is cut off when 3 threshold value.
Figure 10 is the curve graph of the variation of voltage V when to show impedance Z only be resistance.In Fig. 5 and Figure 10, when usual Bypass resistance 35 is because that switch 11 is closed is in the conduction state, and the 2nd switch 12 keeps power cord 901 in the conduction state, because And voltage V=Vac is applied to equipment 30.
It is sharply increased in the voltage Vac of source power supply 90, control unit 40 is determined as the voltage exported from voltage detector 33 When more than threshold value, control unit 40 stops the energization to the light emitting diode 11a of switch 11, and photoelectricity bidirectional triode thyristor 11b is made to disconnect.
As a result, constituting the closed-circuit of source power supply 90- equipment 30- impedance circuit 20- source power supplies 90.At this point, Voltage V=Vac-Vz can only be applied to equipment 30.As a result, protection equipment 30 is not subjected to overvoltage.
Then, in the case where overvoltage condition continues, rise with the voltage Vac of source power supply 90, be applied to equipment 30 voltage V also rises, and when voltage V reaches 3 threshold value, the 2nd switch 12 cuts off power cord 901.As a result, protection is set Standby 30, and the power consumption in impedance circuit 20 is made to stop.
(D) the 4th embodiment is that the 3rd embodiment is changed to a voltage detector and the 2nd switch set on source power supply The mode obtained between 90 and DC power portion 80, but can also voltage detector be only set to source power supply 90 and DC power supply Between portion 80.
(E) shown in the 3rd embodiment, the 4th embodiment has excess voltage protection in the inside of equipment Example, but equipment is not limited to converter circuit and inverter circuit.
<5th embodiment>
(1) structure of excess voltage protection 150
Figure 12 is the circuit diagram of the device of the excess voltage protection 150 of the 5th embodiment with the present invention.In Figure 12 In, equipment 30 is powered from source power supply 90 via a pair of of power cord 901,902.Excess voltage protection 150 is connected to commercialization Between power supply 90 and equipment 30.
Excess voltage protection 150 includes variable impedance circuit 120 and voltage detector 33.
(2) concrete structure of excess voltage protection 150
(2-1) variable impedance circuit 120
Variable impedance circuit 120 is configured to make the circuit that the ratio between voltage and current in the circuit i.e. impedance value reaches Z.And And impedance value Z is variable.
Variable impedance circuit 120 is connected on power cord 902 between source power supply 90 and equipment 30.
(2-2) voltage detector 33
Voltage detector 33 is made of ac voltage detection circuit.There are many ac voltage detection circuits, according to using item Part and suitably use.Specifically, for example with the voltage detector (reference that is used in the 1st embodiment and the 2nd embodiment It is Fig. 2) identical, thus in this description will be omitted.
(3) action of excess voltage protection 150
Figure 13 is to show that the impedance of equipment 30 is only that resistance components, impedance Z are only variable resistances and impedance value Z continuously increases The curve graph of the variation of the voltage V of added-time.In Figure 12 and Figure 13, when usual impedance value Z be 0 or close to 0 value, thus Voltage V ≒ Vac are applied to equipment 30.
The voltage Vac=V of source power supply 90 when usual0When following, the voltage Vac of source power supply 90 increases, and is controlling Portion 40 processed is determined as that the voltage exported from voltage detector 33 is more than V0When, control unit 40 makes impedance value Z with voltage detector The increase of 33 detected value and increase continuously.
As a result, applying the voltage V=of the amount of pressure drop Vz at the both ends for having subtracted variable impedance circuit 120 to equipment 30 Vac-Va, protection equipment 30 are not subjected to overvoltage.
Decline in the voltage Vac of source power supply 90, control unit 40 is determined as that the voltage exported from voltage detector 33 is less than When threshold value for recovery, control unit 40 make the impedance value Z of variable impedance circuit 120 revert to 0 or close to 0 value.As a result, Revert to common action.
(4) variation
In addition, the variation of impedance value Z is not necessarily required to increase continuously as shown in figure 13, can also be interrupted increase.
For example, Figure 14 is to show that the impedance of equipment 30 be only resistance components, impedance Z is only variable resistance and impedance value Z The curve graph of the variation of voltage V when increasing by stages.
In Figure 12 and Figure 14, even the value V when voltage Vac of source power supply 90 is more than usual0When, control unit 40 Make impedance value Z be maintained 0 or close to 0 value.Then, voltage Vac continues to rise, the detected value of voltage detector 33 is more than V1When, control unit 40 makes impedance value Z be increased to Za.As a result, the amount of pressure drop Vz at the both ends of variable impedance circuit 120 increases, it is right Equipment 30 applies voltage V=Vac-Vz, is applied to the voltage V of equipment 30 from V1It is reduced to V0, equipment 30 is protected to be not subjected to electricity Pressure.
Later with time going by, voltage Vac rises, but impedance value Z is maintained Z by control unit 40a.Later in voltage Vac continues rising, the detected value of voltage detector 33 is more than V2When, control unit 40 makes impedance value Z be increased to Zb.As a result, can The amount of pressure drop Vz at the both ends of variable resistance reactive circuit 120 is further increased, and is applied voltage V=Vac-Vz to equipment 30, is applied to equipment 30 voltage V is from V1It is reduced to V0, equipment 30 is protected to be not subjected to overvoltage.
The feature of (5) the 5th embodiments
Impedance value Z is set to smaller value (including 0) by (5-1) in excess voltage protection 150 when usual, because And the power consumption in variable impedance circuit 120 can be inhibited, also reduce in the pressure drop of variable impedance circuit 120, inhibition pair is set Standby 30 application voltage declines the amount of pressure drop in variable impedance circuit 120.
On the other hand, impedance value Z is set to larger value in overvoltage, thus the voltage that equipment 30 applies is declined In the amount of pressure drop of variable impedance circuit 120, equipment 30 can be protected to be not subjected to overvoltage.
(5-2) also, variable impedance circuit 120 can make impedance value Z with the variation of the detected value of voltage detector 33 And continuously change.
(5-3) is in addition, variable impedance circuit 120 also can make impedance value Z with the change of the detected value of voltage detector 33 Change and changes by stages.
<6th embodiment>
(1) structure of excess voltage protection 150
Figure 15 is the circuit diagram of the device of the excess voltage protection 150 of the 6th embodiment with the present invention.In Figure 15 In, equipment 30 is powered from source power supply 90 via a pair of of power cord 901,902.Excess voltage protection 150 is connected to commercialization Between power supply 90 and equipment 30.
Excess voltage protection 150 includes variable impedance circuit 120 and voltage detector 33.
(2) concrete structure of excess voltage protection 150
The variable impedance circuit 120 of 6th embodiment is made of multiple impedors, this point and above-mentioned 5th embodiment party Formula is different, and other structures are identical as the 5th embodiment.Therefore, only variable impedance circuit 120 is illustrated herein.
(2-1) variable impedance circuit 120
Variable impedance circuit 120 includes low impedance element 121, high-impedance component 122 and switching switch 123.
Variable impedance circuit 120 can selectively use low impedance element 121 and high impedance member by switching switch 123 Part 122.Low impedance element 121 has impedance value Z1.Also, high-impedance component 122 has specific impedance value Z1Big impedance value Z2。
When using low impedance element 121, when the detected value of voltage detector 33 is more than defined threshold value, variable impedance The impedor used can be switched to high-impedance component 122 by circuit 120 from low impedance element 121.
(3) action of excess voltage protection 150
Figure 16 is the curve for the variation for showing the voltage V when impedance of equipment 30 be only resistance components, impedance Z is only resistance Figure.In Figure 15 and Figure 16, when usual, variable impedance circuit 120 will switch the contact and low impedance element 121 of switch 123 Connection.The impedance value Z of low impedance element 1211Be 0 or close to 0 value, thus voltage V ≒ Vac are applied to equipment 30.
Assuming that the voltage Vac=V of the source power supply 90 when usual0.Even if being more than logical in the voltage Vac of source power supply 90 Value V when often0When, control unit 40 also can maintain impedance value Z using the low impedance element 121 of variable impedance circuit 1201。
Then, voltage Vac continues to rise, the detected value of voltage detector 33 is more than the 1st threshold value V1When, control unit 40 makes Switching switch 123 is acted, and contact is connect with high-impedance component 122.
The impedance value Z of high-impedance component 1222More than the impedance value Z of low impedance element 1211, thus variable impedance circuit 120 The amount of pressure drop Vz at both ends increase, voltage V=Vac-Vz is applied to equipment 30.
As a result, being applied to the voltage V of equipment 30 from V1It is reduced to V0, equipment 30 is protected to be not subjected to overvoltage.
Decline in the voltage Vac of source power supply 90, control unit 40 is determined as that the voltage exported from voltage detector 33 is less than When threshold value for recovery, the impedor of variable impedance circuit 120 is switched to low-resistance by control unit 40 from high-impedance component 122 Anti- element 121 makes impedance value Z2Revert to Z1.Common action is reverted to as a result,.
The feature of (4) the 6th embodiments
(4-1), in overvoltage, declines can variable resistance the voltage that equipment 30 applies in excess voltage protection 150 The amount of pressure drop of reactive circuit 120, protection equipment 30 are not subjected to overvoltage.
(4-2) declines the voltage that equipment 30 applies when the service voltage from source power supply 90 is excessive voltage The amount of pressure drop of variable impedance circuit 120 is carried because without being designed due to protection just to the excessive voltage to the short time The voltage rating of high equipment 30, it is relatively more reasonable.
<7th embodiment>
(1) structure of excess voltage protection 150
Figure 17 is the circuit diagram of the device of the excess voltage protection 150 of the 7th embodiment with the present invention.In Figure 17 In, equipment 30 is powered from source power supply 90 via a pair of of power cord 901,902.Excess voltage protection 150 is connected to commercialization Between power supply 90 and equipment 30.
Excess voltage protection 150 includes variable impedance circuit 120, voltage detector 33 and the 2nd switch 12.
(2) concrete structure of excess voltage protection 150
7th embodiment is to add the mode that the 2nd switch 12 obtains, variable impedance circuit 120 and electricity to the 5th embodiment Detector 33 is pressed to use identical structure.Therefore, only the 2nd switch 12 is illustrated herein.
(2-1) the 2nd switch 12
Power cord 901 is disconnected and is closed by the 2nd switch 12.Wherein, it is to instigate power cord power cord 901 to be disconnected and is closed 901 conductings are cut off and are in not on-state.
It is i.e. in the conduction state that 2nd switch 12 is closed power cord 901 when usual.On the other hand, in overvoltage, After the impedance value Z variations of variable impedance circuit 120 have carried out the protection act of equipment 30, the 2nd switch 12 disconnects, will be electric Source line 901 is cut off.
The purpose that power cord 901 is cut off is, the hypothesis when the overvoltage of power supply reaches design variable impedance circuit In the case of more than voltage or in the case where the duration of overvoltage condition reaching the imaginary time or more, in order to make to can be changed The power consumption and temperature rise of impedance circuit 120 stop, and can reduce the rated power of variable impedance circuit 120, Neng Goushi It is existing cost effective.2nd switch 12 uses relay circuit.
As shown in figure 17, the 2nd switch 12 includes the relay tip 12a for making power cord 901 disconnect and be closed, makes relay The relay coil 12b and energization and cold transistor 12c are carried out to relay coil 12b that contact 12a is acted. One end of relay coil 12b is connect with the anode of power supply Vb, and the other end is connect with the collector side of transistor 12c.Control unit The presence or absence of the base current of 40 switching transistor 12c, makes switched on and off between collector and emitter, carries out to relay line Enclose energization and the no power of 12b.
(3) action of excess voltage protection 150
Figure 18 is the curve for the variation for showing the voltage V when impedance of equipment 30 be only resistance components, impedance Z is only resistance Figure.In Figure 17 and Figure 18,2nd switch 12 keeps power cord 901 in the conduction state when usual.Also, variable impedance circuit 120 impedance value Z be 0 or close to 0 value, thus voltage V ≒ Vac are applied to equipment 30.
The voltage Vac of source power supply 90 when usual is V0When following, the voltage Vac of source power supply 90 increases, and is controlling Portion 40 processed is determined as that the voltage exported from voltage detector 33 is more than V0When, control unit 40 makes impedance value Z with voltage detector The increase of 33 detected value and increase continuously.
As a result, applying the voltage V=of the amount of pressure drop Vz at the both ends for having subtracted variable impedance circuit 120 to equipment 30 Vac-Vz, protection equipment 30 are not subjected to overvoltage.
Then, in the case where overvoltage condition continues, rise with the voltage Vac of source power supply 90, be applied to equipment 30 voltage V also rises.But reach the 1st threshold value V in voltage Vac1When, the 2nd switch 12 cuts off power cord 901.Its result It is to protect equipment 30, and stop at the power consumption of variable impedance circuit 120.
Decline in the voltage Vac of source power supply 90, control unit 40 is determined as that the voltage exported from voltage detector 33 is less than When threshold value for recovery, control unit 40 make the impedance value Z of variable impedance circuit 120 revert to 0 or close to 0 value.Also, So that the 2nd switch 12 is connected and is connected power cord 901, thus reverts to common action.
The feature of (4) the 7th embodiments
(4-1), in overvoltage, declines can variable resistance the voltage that equipment 30 applies in excess voltage protection 150 The amount of pressure drop of reactive circuit 120, protection equipment 30 are not subjected to overvoltage.
(4-2) the 2nd switch 12 cuts off power cord 901, thus stops at the power consumption of variable impedance circuit 120.Its As a result, it is possible to inhibit the overheat of variable impedance circuit 120, reduce rated power.
(4-3) declines the voltage that equipment 30 applies when the service voltage from source power supply 90 is excessive voltage The amount of pressure drop of variable impedance circuit 120 is carried because without being designed due to protection just to the excessive voltage to the short time The voltage rating of high equipment 30, it is relatively more reasonable.
<8th embodiment>
(1) structure of excess voltage protection 150
Figure 19 is the circuit diagram of the device of the excess voltage protection 150 of the 8th embodiment with the present invention.In Figure 19 In, equipment 30 is powered from source power supply 90 via a pair of of power cord 901,902.Excess voltage protection 150 is connected to commercialization Between power supply 90 and equipment 30.
Excess voltage protection 150 includes variable impedance circuit 120, voltage detector 33 and the 2nd switch 12.
(2) concrete structure of excess voltage protection 150
The variable impedance circuit 120 of 8th embodiment is made of multiple impedors, this point and above-mentioned 7th embodiment party Formula is different, and other structures are identical as the 7th embodiment.Therefore, only variable impedance circuit 120 is illustrated herein.
(2-1) variable impedance circuit 120
Variable impedance circuit 120 includes low impedance element 121, high-impedance component 122 and switching switch 123.
Variable impedance circuit 120 can selectively use low impedance element 121 and high impedance member by switching switch 123 Part 122.Low impedance element 121 has impedance value Z1.Also, high-impedance component 122 has specific impedance value Z1Big impedance value Z2。
When using low impedance element 121, when the detected value of voltage detector 33 is more than defined threshold value, variable impedance The impedor used can be switched to high-impedance component 122 by circuit 120 from low impedance element 121.
(3) action of excess voltage protection 150
Figure 20 is the curve for the variation for showing the voltage V when impedance of equipment 30 be only resistance components, impedance Z is only resistance Figure.In Figure 19 and Figure 20, when usual, variable impedance circuit 120 will switch the contact and low impedance element 121 of switch 123 Connection.The impedance value Z of low impedance element 1211Be 0 or close to 0 value, thus voltage V ≒ Vac are applied to equipment 30.
The voltage Vac of source power supply 90 when usually is V0Below.Even if being more than usual in the voltage Vac of source power supply 90 When value V0When, control unit 40 also uses the low impedance element 121 of variable impedance circuit 120, maintains impedance value Z1。
Then, voltage Vac continues to rise, the detected value of voltage detector 33 is more than the 1st threshold value V1When, control unit 40 makes Switching switch 123 is acted, and contact is connect with high-impedance component 122.
The impedance value Z of high-impedance component 1222More than the impedance value Z of low impedance element 1211, thus variable impedance circuit 120 The amount of pressure drop Vz at both ends increase, voltage V=Vac-Vz is applied to equipment 30.
As a result, being applied to the voltage V of equipment 30 from V1It is reduced to V0, equipment 30 is protected to be not subjected to overvoltage.
Then, in the case where overvoltage condition continues, rise with the voltage Vac of source power supply 90, be applied to equipment 30 voltage V also rises.But reach the 2nd threshold value V in voltage Vac2(can also be V2=V1) when, the 2nd switch 12 is by power supply Line 901 is cut off.As a result, protection equipment 30, and stop at the power consumption of variable impedance circuit 120.
Decline in the voltage Vac of source power supply 90, control unit 40 is determined as that the voltage exported from voltage detector 33 is less than When threshold value for recovery, the impedor of variable impedance circuit 120 is switched to low-resistance by control unit 40 from high-impedance component 122 Anti- element 121 makes impedance value Z2Revert to impedance value Z1.Also, the 2nd switch 12 is set to connect and connect power cord 901, thus Revert to common action.
The feature of (4) the 8th embodiments
(4-1) in excess voltage protection 150, in overvoltage, by the impedor of variable impedance circuit 120 from low Impedor 121 is switched to high-impedance component 122, thus declines impedance value Z to the voltage that equipment 30 applies2Amount of pressure drop, protect Shield equipment 30 is not subjected to overvoltage.
(4-2) also, the 2nd switch 12 cut off power cord 901, and the power for thus stopping at variable impedance circuit 120 disappears Consumption.As a result, the overheat of variable impedance circuit 120 can be inhibited, reduce rated power.
(4-3) when the service voltage from source power supply 90 is excessive voltage, the voltage decline applied to equipment 30 can The amount of pressure drop of variable resistance reactive circuit 120 designs raising due to without being protected just to the excessive voltage to the short time The voltage rating of equipment 30, it is relatively more reasonable.
<9th embodiment>
(1) structure of power-converting device 300
Figure 21 is the electricity of the power-converting device 300 of the excess voltage protection 200 of the 9th embodiment with the present invention Lu Tu.In figure 21, power-converting device 300 is made of DC power portion 80, inverter 95, excess voltage protection 200.
Inverter 95 is powered from DC power portion 80 via a pair of of power cord 801,802.Excess voltage protection 200 connects It is connected between DC power portion 80 and inverter 95.
(1-1) DC power portion 80
DC power portion 80 is made of rectification part 81 and the smoothing capacity device being connected in parallel with rectification part 81 82.
Rectification part 81 is configured to bridge like by 4 diodes D1a, D1b, D2a, D2b.Specifically, diode D1a and D1b, D2a and D2b connections in series with each other.The respective cathode terminal of diode D1a, D2a all with the positive side of smoothing capacity device 82 Son connection, the positive side leading-out terminal as rectification part 81 play a role.Each anode tap of the respective diode of diode D1b, D2b Son is all connect with the negative side terminal of smoothing capacity device 82, and the negative side leading-out terminal as rectification part 81 plays a role.
The tie point of diode D1a and diode D1b are connect with a pole of source power supply 90.Diode D2a and two poles The tie point of pipe D2b is connect with another pole of source power supply 90.Rectification part 81 is to the alternating voltage that is exported from source power supply 90 It carries out rectification and generates direct current, and direct current is supplied to smoothing capacity device 82.
Smoothing capacity device 82 by the voltage after 81 rectification of rectification part to being smoothed.Voltage Vdc after will be smooth is applied Add to the inverter 95 being connect with the outlet side of smoothing capacity device 82.
In addition, the type about capacitor, can enumerate electrolytic capacitor and thin film capacitor etc., in present embodiment In, smoothing capacity device 82 uses electrolytic capacitor.
The DC power portion 80 can also be known as alternating voltage being transformed to the converter circuit of DC voltage.
(1-2) inverter 95
Inverter 95 includes multiple IGBT (insulated gate polar form bidirectional transistor, hereinafter referred to as transistor) and multiple reflux Use diode.Inverter 95 is applied to the voltage Vdc from smoothing capacity device 82, and is being indicated by gate driving circuit 96 Timing carries out the switched on and off of each transistor, thus generates the driving voltage of driving motor 500.Motor 500 is, for example, heat pump Compressor electric motor, the fan electromotor of formula air conditioner.
In addition, the inverter 95 of present embodiment is voltage shape inverter, but not limited to this, can also be electric current shape inversion Device.
(1-3) gate driving circuit 96
Gate driving circuit 96 makes the switched on and off of each transistor of inverter 95 according to the instruction from control unit 40 State change.
(1-4) excess voltage protection 200
Excess voltage protection 200 includes variable impedance circuit 170, voltage detector 83, the 2nd switch 62.
(2) concrete structure of excess voltage protection 200
9th embodiment and the 7th embodiment having been described above and the 8th embodiment it is maximum the difference is that, mistake Voltage protection circuit 200 is located at direct current portion.Therefore, direct-current ratings also are replaced with from exchange specification in view of each integral part, Even identical title, also replaces label and illustrate again.
(2-1) variable impedance circuit 170
Variable impedance circuit 170 is configured to make the circuit that the ratio between voltage and current in the circuit i.e. impedance value reaches Z.It is logical Frequently with resistive element.
Variable impedance circuit 170 is connected on power cord 802 between DC power portion 80 and inverter 95.
Variable impedance circuit 170 includes low impedance element 171, high-impedance component 172 and switching switch 173.
Variable impedance circuit 170 can selectively use low impedance element 171 and high impedance member by switching switch 173 Part 172.Low impedance element 171 has impedance value Z1.Also, high-impedance component 172 has specific impedance value Z1Big impedance value Z2。
When using low impedance element 171, when the detected value of voltage detector 83 is more than defined threshold value, variable impedance The impedor used can be switched to high-impedance component 172 by circuit 170 from low impedance element 171.
(2-2) voltage detector 83
Voltage detector 83 is connect with the outlet side of smoothing capacity device 82, and the both end voltage of detection smoothing capacity device 82 is i.e. flat The value of voltage Vdc after cunning.Voltage detector 83 is for example configured to will be connected in series with each other two resistance and smoothing capacity devices 82 are connected in parallel, and are divided to voltage Vdc.By the voltage value input control portion 40 of the mutual tie point of the two resistance.
(2-3) the 2nd switch 62
Power cord 801 is disconnected and is closed by the 2nd switch 62.Wherein, it refers to by power cord power cord 801 to be disconnected and is closed 801 conductings are cut off and make to be in not on-state.
Power cord 801 is closed in the conduction state by the 2nd switch 62 when usual.On the other hand, in overvoltage, After the impedance value Z variations of variable impedance circuit 170 have carried out the protection act of inverter 95, the 2nd switch 62 disconnects, will Power cord 801 is cut off.
It is to stop at the power consumption of variable impedance circuit 170 by the purpose that power cord 801 is cut off, can reduce can The rated power of variable resistance reactive circuit 170 can be realized cost effective.2nd switch 62 uses relay circuit.
As shown in figure 21, the 2nd switch 62 includes by relay tip 62a that power cord 801 is disconnected and is closed, makes relay Relay coil 62b that contact 62a is acted, relay coil 62b be powered and cold transistor 62c.After One end of electric apparatus coil 62b is connect with the anode of power supply Vb, and the other end is connect with the collector side of transistor 62c.Control unit 40 The presence or absence of the base current of switching transistor 62c, will be switched on and off between collector and emitter, to relay coil 62b Carry out energization and no power.
(3) action of excess voltage protection 200
In figure 21,2nd switch 62 keeps power cord 801 in the conduction state when usual.Also, it can variable resistance when usual The contact for switching switch 173 is connect by reactive circuit 170 with low impedance element 171.The impedance value Z of low impedance element 1711Be 0 or Value of the person close to 0, thus voltage V ≒ Vdc are applied to inverter 95.
When the voltage Vdc of DC power portion 80 increases, and the detected value of voltage detector 83 is more than 1 threshold value, control unit 40 make switching switch 173 be acted, and contact is connect with high-impedance component 172.
The impedance value Z of high-impedance component 1722More than the impedance value Z of low impedance element 1711, thus variable impedance circuit 170 The amount of pressure drop Vz at both ends increases, and applies voltage V=Vdc-Vz to inverter 95.As a result, being applied to the voltage V of inverter 95 Reduce, protection inverter 95 is not subjected to overvoltage.
Then, in the case where overvoltage condition continues, the voltage V for being applied to inverter 95 also rises.But in direct current When the voltage Vdc of power supply unit 80 reaches the 2nd threshold value (can also=the 1st threshold value), the 2nd switch 62 disconnects power cord 801.It is tied Fruit is that protection inverter 95 is not subjected to overvoltage, and the power consumption in variable impedance circuit 170 is made to stop.
Decline in the voltage Vdc of DC power portion 80, control unit 40 is determined as that the voltage exported from voltage detector 83 returns When returning and being less than threshold value, the impedor of variable impedance circuit 170 is switched to Low ESR by control unit 40 from high-impedance component 172 Element 171 makes impedance value Z2Revert to impedance value Z1.Also, so that the 2nd switch 62 is connected and is connected power cord 801, it is thus extensive It is common action again.
The feature of (4) the 9th embodiments
(4-1), in overvoltage, the impedor of variable impedance circuit 170 is switched in excess voltage protection 200 For high-impedance component 172, impedance value Z thus is declined to the voltage that inverter 95 applies2Amount of pressure drop, protect inverter 95 not meet with By overvoltage.
(4-2) also, the 2nd switch 62 cut off power cord 801, and the power for thus stopping at variable impedance circuit 170 disappears Consumption.As a result, the rated power of variable impedance circuit 170 can be reduced.
<10th embodiment>
(1) structure of excess voltage protection 200
Figure 22 is the power-converting device 300 of the excess voltage protection 200 of the 10th embodiment with the present invention Circuit diagram.In fig. 22, inverter 95 is powered from DC power portion 80 via a pair of of power cord 801,802.Overvoltage protection A part for circuit 200 is connected between source power supply 90 and DC power portion 80, and other parts are connected to DC power portion 80 Between inverter 95.
Excess voltage protection 200 includes variable impedance circuit 170, voltage detector 33, the 2nd switch 12.
10th embodiment and the 9th embodiment that has been described above the difference is that, as excess voltage protection The voltage detector of 200 inscape and the 2nd switch are set between source power supply 90 and DC power portion 80.That is, voltage is examined The configuration of survey device and the 2nd switch is identical as the voltage detector 33 in the 8th embodiment and the configuration of the 2nd switch 12.Therefore, it reflects Exchange specification also is replaced with from direct-current ratings in voltage detector and the 2nd switch, using the voltage detecting in the 8th embodiment Device 33 and the 2nd switch 12.
Therefore, the content of each integral part and the voltage detector 33 in the 2nd embodiment and the implementation of the 2nd switch the 12, the 9th The variable impedance circuit 170 of mode is identical, thus in this description will be omitted, only carries out action specification.
(2) action of excess voltage protection 200
In fig. 22,2nd switch 12 keeps power cord 901 in the conduction state when usual.Also, it can variable resistance when usual The contact for switching switch 173 is connect by reactive circuit 170 with low impedance element 171.The impedance value Z of low impedance element 1711Be 0 or Value of the person close to 0, thus voltage V ≒ Vdc are applied to inverter 95.
Due to the variation of the voltage Vac of source power supply 90, the voltage Vdc of DC power portion 80 increases, in voltage detector When 33 detected value is more than 1 threshold value, control unit 40 makes switching switch 173 be acted, and contact and high-impedance component 172 are connected It connects.
The impedance value Z of high-impedance component 1722More than the impedance value Z of low impedance element 1711, thus variable impedance circuit 170 The amount of pressure drop Vz at both ends increase, voltage V=Vdc-Vz is applied to inverter 95.As a result, being applied to the electricity of inverter 95 V is pressed to reduce, protection inverter 95 is not subjected to overvoltage.
Then, in the case where overvoltage condition continues, the voltage V for being applied to inverter 95 also rises.But in voltage When the detected value of detector 33 reaches the 2nd threshold value (can also=the 1st threshold value), the 2nd switch 12 cuts off power cord 901.It is tied Fruit is that protection inverter 95 is not subjected to overvoltage, and stops at the power consumption of variable impedance circuit 170.
The voltage Vac of source power supply 90 is stable, voltage Vdc of DC power portion 80 declines, control unit 40 be determined as from When the voltage that voltage detector 33 exports is less than the threshold value for recovery, control unit 40 is by the impedance element of variable impedance circuit 170 Part is switched to low impedance element 171 from high-impedance component 172, makes impedance value Z2Revert to impedance value Z1.Also, make the 2nd switch 12 It connects and connects power cord 901, thus revert to common action.
The feature of (3) the 10th embodiments
(3-1) in excess voltage protection 200, by the way that the impedor of variable impedance circuit 170 is switched to high resistant Anti- element 172, the voltage applied to inverter 95 have dropped impedance value Z2Amount of pressure drop, thus protect inverter 95 be not subjected to Voltage.
(3-2) also, the 2nd switch 12 cut off power cord 901, and the power for thus stopping at variable impedance circuit 170 disappears Consumption.As a result, the overheat of variable impedance circuit 170 can be inhibited, reduce rated power.
<Other variations>
(A) excess voltage protection 150 of the 5th embodiment shown in FIG. 1 is to be protected for the overvoltage of alternating voltage Protection circuit is embodiment, and is had in the case where power supply is DC power supply or in equipment whole to AC power progress In the case of the DC power portion of stream, each integral part can also be replaced with direct-current ratings from exchange specification and be set to direct current The downstream side in source portion.
(B) in the 8th embodiment, reach in voltage Vac as defined in 2 threshold value when, the 2nd switch 12 is by power cord 901 Cut-out, can also be to be cut off when overvoltage condition have passed through the defined duration.
(C) in the 8th embodiment, reach in voltage Vac as defined in 2 threshold value when, the 2nd switch 12 is by power cord 901 Cut-out, can also be the equipment voltage detector 37 for also setting up the voltage V that detection is applied to equipment, reach defined in voltage V It is cut off when 3 threshold value.
Figure 23 is the circuit diagram of the device for the excess voltage protection 150 for showing to have other variations.Also, Figure 24 is The curve graph of the variation of voltage V when to show impedance only be resistance.In Figure 23 and Figure 24, variable impedance circuit when usual 120 connect the contact for switching switch 123 with low impedance element 121.The impedance value Z of low impedance element 1211It is 0 or close to 0 Value, thus voltage V ≒ Vac are applied to equipment 30.
Value V when even the voltage Vac of source power supply 90 is more than usual0When, control unit 40 also uses variable impedance electricity The low impedance element 121 on road 120 maintains impedance value Z1。
Then, continue to rise in voltage Vac and the detected value of voltage detector 33 is more than the 1st threshold value V1When, control unit 40 So that switching switch 123 is acted, contact is connect with high-impedance component 122.
The impedance value Z of high-impedance component 1222More than the impedance value Z of low impedance element 1211, thus variable impedance circuit 120 The amount of pressure drop Vz at both ends increases, and applies voltage V=Vac-Vz to equipment 30.As a result, the voltage for being applied to equipment 30 reduces, Protection equipment 30 is not subjected to overvoltage.
Then, control unit 40 maintains the state for connecting the contact for switching switch 123 with high-impedance component 122, but in mistake In the case that voltage status continues, as shown in figure 24, rises with the voltage Vac of source power supply 90, be applied to the electricity of equipment 30 Pressure V also rises.
Also, reach threshold value V in the detected value of equipment voltage detector 37mWhen, control unit 40 will be electric via the 2nd switch 12 Source line 901 is cut off.As a result, protection equipment 30, and stop in the power consumption and temperature of variable impedance circuit 120 It rises.
Decline in the voltage Vac of source power supply 90, control unit 40 is determined as that the voltage exported from voltage detector 33 is less than When threshold value for recovery, the impedor of variable impedance circuit 120 is switched to low-resistance by control unit 40 from high-impedance component 122 Anti- element 121 makes impedance value Z2Revert to impedance value Z1.Also, the 2nd switch 12 is set to connect and connect power cord 901, thus Revert to common action.
(D) the 10th embodiment is to be changed to the voltage detector of the 9th embodiment and the 2nd switch to be set to source power supply The mode obtained between 90 and DC power portion 80, but can also voltage detector be only set to source power supply 90 and DC power supply Between portion 80.
(E) shown in the 9th embodiment, the 10th embodiment has excess voltage protection in the inside of equipment Example, but equipment is not limited to converter circuit and inverter circuit.
(F) it in the 6th embodiment and the 8th embodiment, can also substitute using the structure for switching switch 123, and incite somebody to action The switch 11 of 1st embodiment is connected in series with respectively with low impedance element 121 and high-impedance component 122, and according to voltage detecting The detection voltage switching of device 33 needs the switch connected.
(G) it in the 9th embodiment and the 10th embodiment, can also substitute using the structure for switching switch 173, and incite somebody to action The switch 71 of 3rd embodiment is connected in series with respectively with low impedance element 171 and high-impedance component 172, and according to voltage detecting The detection voltage switching of device 83 needs the switch connected.
Industrial availability
The equipment such as refrigerating plant that the present invention is used to use in the region that supply voltage easy tos produce variation.
Label declaration
11,61 switch；12,62 the 2nd switch；20,70 impedance circuit；33,83 voltage detector；35,85 bypass resistance；37 Equipment voltage detector；50,100 excess voltage protection；80 DC power portions (DC power supply, converter circuit)；90 commercial electricity Source (AC power supplies)；95 inverters (inverter circuit)；120,170 variable impedance circuit；121,171 low impedance element；122、172 High-impedance component；150,200 excess voltage protection；300 power-converting devices.
Existing technical literature
Patent document
Patent document 1：Japanese Unexamined Patent Publication 2009-207329 bulletins

Claims (6)

1. a kind of excess voltage protection of refrigerating plant (50) is connected to AC power and provides electric power with by the power supply Equipment between, the excess voltage protection has：
Impedance circuit (20) is connected in series in the power cord for connecting the power supply and the equipment with the equipment On；
Voltage detector (33), detects the voltage of the power supply；And
Bypass resistance (35) bypasses the impedance circuit (20),
The bypass resistance (35) has disconnects and connects alternating current to disconnect and be closed the bypass resistance (35) Two-way switch (11),
The bypass resistance (35) are closed by the switch (11) when usual, super in the detected value of the voltage detector (33) When crossing defined threshold value, the bypass resistance (35) are cut off.
2. excess voltage protection (50) according to claim 1, wherein
The excess voltage protection also has the 2nd switch (12) that the power cord is disconnected and is closed,
2nd switch (12) makes the power cord in the conduction state when usual, the inspection in the voltage detector (33) When measured value is more than defined 2 threshold value, the power cord is cut off after the switch (11) is acted.
3. excess voltage protection (50) according to claim 1, wherein
The excess voltage protection also has the 2nd switch (12) that the power cord is disconnected and is closed,
2nd switch (12) makes the power cord in the conduction state when usual, the inspection in the voltage detector (33) It, will after the switch (11) is acted when measured value is longer than defined duration decision content more than the time of defined threshold value The power cord cut-out.
4. excess voltage protection (50) according to claim 1, wherein
The excess voltage protection also has the 2nd switch (12) that the power cord is disconnected and is closed and detection application To the equipment voltage detector (37) of the voltage of the equipment,
2nd switch (12) makes the power cord in the conduction state when usual, in the equipment voltage detector (37) Detected value be more than defined 3 threshold value when, the power cord is cut off after the switch (11) is acted.
5. excess voltage protection (50) according to claim 1, wherein
The two-way switch (11) be bidirectional triode thyristor or be bidirectional conduction MOSFET.
6. a kind of power-converting device, has：
Excess voltage protection described in any one of Claims 1 to 5；
The voltage transformation of the AC power is DC voltage by converter circuit (80)；And
The DC voltage conversion is alternating voltage by inverter circuit (95).
CN201810288442.9A 2013-12-27 2014-12-24 Excess voltage protection and power-converting device with the excess voltage protection Pending CN108418178A (en)

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JP5761425B2 (en) 2015-08-12

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Application publication date: 20180817