CN110071624A - Drive control circuit and air conditioner - Google Patents
Drive control circuit and air conditioner Download PDFInfo
- Publication number
- CN110071624A CN110071624A CN201910447793.4A CN201910447793A CN110071624A CN 110071624 A CN110071624 A CN 110071624A CN 201910447793 A CN201910447793 A CN 201910447793A CN 110071624 A CN110071624 A CN 110071624A
- Authority
- CN
- China
- Prior art keywords
- drive control
- control circuit
- circuit
- signal
- switch element
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000001960 triggered effect Effects 0.000 claims abstract description 25
- 239000003990 capacitor Substances 0.000 claims description 42
- 238000007599 discharging Methods 0.000 claims description 6
- 238000010521 absorption reaction Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 14
- 238000001914 filtration Methods 0.000 description 11
- 230000005611 electricity Effects 0.000 description 7
- 239000010409 thin film Substances 0.000 description 7
- 238000001514 detection method Methods 0.000 description 5
- 230000000875 corresponding effect Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000002596 correlated effect Effects 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 206010037660 Pyrexia Diseases 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention proposes a kind of drive control circuits and a kind of air conditioner, wherein, drive control circuit includes: the first resistance element and switch element, switch element is configured as the surging signal on control the first resistance element absorption bus, is serially connected between high voltage bus and low-voltage bus bar after the first resistance element and switch element series connection；Comparison circuit, for detecting and confirming that power supply signal is greater than or equal to predeterminated voltage, the interruptive port of trigger control chip, comparison circuit is connected with sample circuit；Chip is controlled, the number control switch element for being triggered according to interruptive port in preset time works according to different carrier frequencies or different duty, and control chip is connected with switch element and comparison circuit respectively.By adjusting the working frequency of switch element, the effect absorbed to surging signal is improved, meanwhile, reduce circuit loss and hardware power consumption.
Description
This application claims on 01 16th, 2019 submission Patent Office of the People's Republic of China, application No. is 201910041249.X, invention
This is hereby incorporated by reference in the priority of the Chinese patent application of entitled " drive control circuit and air conditioner ", entire contents
In application.
Technical field
The present invention relates to field of circuit technology, in particular to a kind of drive control circuit and a kind of air conditioner.
Background technique
Such as compressor, motor, engine threephase load equipment use AC-DC-exchange topological structure, specifically,
AC-DC-exchange topological structure is as shown in Figure 1, comprising: AC power supply module, power filtering module, rectification module, filtering
Module, inverter module and load.
Power frequency component after needing to filter smooth stream due to filter module, so often being made using the electrolytic capacitor of larger capacity
For main filter element.However, the use of electrolytic capacitor will cause THD (the Total Harmonic of input AC electric current
Distortion, total harmonic distortion) increase, and the service life shorter ultimate life for influencing controller of itself, furthermore electrolytic capacitor
Fever reduce controller efficiency.
With the promotion of cost and reliability requirement, electrolytic capacitor capacity reduction even no electrolytic capacitor control program is gradually
It is mature.For no electrolytic capacitor control program, electrolytic capacitor is generally replaced using a thin-film capacitor compared with low capacity.Due to mother
The reduction of line capacitance capacity is deteriorated for the absorbability of surge, and defect is mainly reflected in following two aspect:
One, thin-film capacitor or small electric solution capacitor are limited for surge absoption, lead to the first device of the excessively high damage of busbar voltage
Part.
Two, thin-film capacitor or small electric solution capacitor are limited for surge absoption, if input wave when model machine operates normally
Voltage is gushed, leads to busbar voltage moment acute variation, influences control stability.
Summary of the invention
The present invention is directed to solve at least one of the technical problems existing in the prior art or related technologies.
For this purpose, first aspect of the present invention is to propose a kind of drive control circuit.
The second aspect of the invention is to propose a kind of air conditioner.
In view of this, according to the first aspect of the invention, proposing a kind of drive control circuit, comprising: inverter bridge, it is inverse
Become bridge and be used for drive control load running, inverter bridge accesses between high voltage bus and low-voltage bus bar；Bus capacitor, the bus
Capacitor is used to provide the described load and powers on required starting voltage, and the bus capacitor is also used to absorb the surging signal, institute
Bus capacitor access is stated in the two buss lines of the inverter bridge input side；Reactor, for absorbing the drive control circuit
The surging signal generated during the load running is driven, the reactor access is between power grid and the load；Sampling
Circuit, for acquiring power supply signal；First surge absorbing circuit, the first surge absorbing circuit include: the first resistance element and open
Close element, switch element is configured as the first resistance element of control and absorbs surging signal on bus, the first resistance element and opens
It is serially connected between high voltage bus and low-voltage bus bar after closing element series connection；Comparison circuit, for detecting and confirming that power supply signal is greater than
Or it is equal to predeterminated voltage, the interruptive port of trigger control chip, comparison circuit is connected with sample circuit；Chip is controlled, is used for
The number control switch element being triggered according to interruptive port in preset time is according to different carrier frequencies or different duty work
Make, control chip is connected with switch element and comparison circuit respectively.
The drive control circuit of embodiment according to the present invention, comprising: inverter bridge, bus capacitor, reactor, comparison are electric
First surge absorbing circuit of road, control chip and the first resistance element and switch element composition.Wherein inverter bridge driving control
Load running processed such as controls motor operation, and since the capacitance of bus capacitor is lower, the surge formed on high voltage bus is believed
It number is unable to ensure and to fully absorb, therefore concatenate between high voltage bus and low-voltage bus bar and be made of the first resistance element and switch element
The first surge absorbing circuit, and be arranged for sample circuit to be collected power supply signal compared with predeterminated voltage is compared
Circuit, power supply signal be greater than or equal to predeterminated voltage in the case where, the interruptive port of trigger control chip, control chip according to
The number control switch element that interruptive port is triggered works according to different carrier frequencies or different duty, i.e., by adjusting opening
The working frequency of element is closed, realizes and quickly absorbs surging signal within a short period of time, and then realization quickly reduces high voltage bus
Voltage, to avoid the damage of the component in drive control circuit.
Wherein, carrier frequency and duty ratio can be predetermined fixed value, be also possible to adjustable changing value.
It is worth noting that absorbing the drive control electricity by the reactor of setting for the ease of controlling surging signal
Road drives the surging signal generated during the load running, and then to block inverter bridge and exchange the surge that input side generates
Signal, busbar voltage be greater than predeterminated voltage when trigger control chip interruptive port, such as detect busbar voltage be greater than or
When the first predeterminated voltage 1, interruptive port is triggered, when detecting busbar voltage less than the first predeterminated voltage 1, stops triggering and interrupts
Port.
Drive control circuit according to the abovementioned embodiments of the present invention can also have following technical characteristic:
In any of the above-described technical solution, further, drive control circuit further include: the second surge absorbing circuit, the
Two surge absorbing circuits include: the first capacitive element and one-way conduction element, and one-way conduction element, which is configured as limitation first, to be held
Property element absorb the surging signal on high voltage bus, the first capacitive element connects with one-way conduction element.
In the technical scheme, pass through the second surge absoption electricity of the first capacitive element of setting and one-way conduction element composition
Road absorbs the surging signal on high voltage bus by the first capacitive element in the case where one-way conduction element meets turn-on condition, into
And improve the surge absoption ability of drive control circuit, wherein one-way conduction element is the element with one-way conduction characteristic, all
Such as diode.
In any of the above-described technical solution, further, the second surge absorbing circuit further include: the second resistance element, the
Two resistance elements are used to discharge the surging signal in the first capacitive element, and the second resistance element is in parallel with the first capacitive element.
In the technical scheme, after the surging signal that the first capacitive element absorbs on high voltage bus, setting and the is utilized
Second resistance element of one capacitive element parallel connection discharges the surging signal in the first capacitive element, the setting of the second resistance element
Improve the reliability of drive control circuit.
In any of the above-described technical solution, further, the second surge absorbing circuit further include: the second capacitive element is used
In absorbing the surging signal on high voltage bus, the second capacitive element is connected with the first capacitive element.
In the technical scheme, when the pressure of high voltage bus is larger, second is connected on the basis of the first capacitive element
Capacitive element, to improve the absorbability of the surging signal of high voltage bus.
In any of the above-described technical solution, further, the second surge absorbing circuit further include: third resistance element, the
For three resistance elements for discharging surging signal in the second capacitive element, third resistance element is in parallel with the second capacitive element.
In the technical scheme, in the case where the second capacitive element is arranged, by the way that third resistance element and second is arranged
Resistance element is used cooperatively, the voltage of the first capacitive element of Lai Pingheng and the second capacitive element both ends, while third resistance element
It is also used to discharge the surging signal on the second capacitive element, to improve the reliability of drive control circuit.
In any of the above-described technical solution, further, the second surge absorbing circuit further include: the 4th resistance element is used
The electric current of the first capacitive element and/or the second capacitive element is flowed through in limitation；4th resistance element, the first capacitive element and unidirectional
Breakover element series connection；Or the 4th resistance element, the first capacitive element, the second capacitive element and the series connection of one-way conduction element.
In the technical scheme, the 4th resistance element is additionally provided in the second surge absorbing circuit, the 4th resistance element exists
Play limitation in second surge absorbing circuit and flow through the electric current of the second surge absorbing circuit, so improve drive control circuit can
By property, while the 4th resistance element also acts as the effect for absorbing surging signal in the second surge absorbing circuit, and then improves the
The absorbability of the surging signal of two surge absorbing circuits, further for, improve the surging signal of drive control circuit
Absorbability.
In any of the above-described technical solution, further, the first surge absorbing circuit further include: arresting element, for releasing
The surging signal in the first resistance element is put, arresting element is in parallel with the first resistance element.
In the technical scheme, by the way that arresting element is arranged, the surge letter on high voltage bus is absorbed in the first resistance element
After number, the surging signal in first resistive yuan, electric discharge member are discharged using the arresting element in parallel with the first resistance element is arranged
The setting of part improves the reliability of drive control circuit.
In any of the above-described technical solution, further, control chip is specifically used for: interruptive port is touched in preset time
The number of hair be it is primary, control switch element is according to first carrier frequency (duty ratio is identical) or the first duty ratio (carrier wave is identical)
Work；The number that interruptive port is triggered in preset time be it is secondary, control switch element is according to the second carrier frequency (duty ratio
It is identical) or the second duty ratio (carrier wave is identical) work；Wherein, the second carrier frequency is greater than first carrier frequency or the second duty ratio
Less than the first duty ratio.
In the technical scheme, by detect interruptive port is triggered within a preset time number control switch element by
It works according to different carrier frequencies, further, since the number being triggered in preset time is more, in order to reduce drive control
The risk of the damage of component in circuit, by increasing the carrier frequency of control switch element operation or reducing switch element fortune
Capable duty ratio, and then reduce the risk of the damage of component.
Further, since predeterminated voltage is set as multiple, detecting that it is pre- that busbar voltage is more than or equal to first
If when voltage 1, i.e., when interruptive port is triggered one time, control switch element works according to first carrier frequency, in busbar voltage
When gradually rising, and detect busbar voltage be greater than the first predeterminated voltage 1 when, i.e., when interruptive port is triggered twice, control is opened
It closes element to work according to the second carrier frequency, wherein the second carrier frequency is greater than first carrier frequency, and then realizes quickly reduction
The voltage of high voltage bus, to avoid the damage of the component in drive control circuit；When busbar voltage gradually rises again, and
When detecting that busbar voltage is greater than the first predeterminated voltage 1, i.e., when interruptive port is triggered three times, control switch element is according to third
Carrier frequency work；So that the voltage of high voltage bus quickly reduces to avoid the damage of the component in drive control circuit
Bad, carrier frequency is presented with the number that terminal prot is triggered and is positively correlated, until carrier frequency reaches the maximum value of setting.
In any of the above-described technical solution, further, control chip is also used to: the busbar voltage of high voltage bus is less than pre-
If the time that is continuously turned on of voltage and switch element is greater than preset duration, stop driving switch element；Or the bus of high voltage bus
Voltage is less than predeterminated voltage, stops driving switch element.
In the technical scheme, it is less than the continuous of predeterminated voltage and switch element in the busbar voltage for detecting high voltage bus
In the case that turn-on time is greater than preset duration, stop driving switch element；Or high voltage bus busbar voltage be less than it is default
In the case where voltage, stop driving switch element.To avoid making using the corresponding absorbing circuit of switch element as bus capacitor
With, and then improve the first resistance element and the service life of other capacitive elements.
In any of the above-described technical solution, further, bus capacitor is thin-film capacitor.
In any of the above-described technical solution, further, further includes: rectification circuit, the rectification circuit is to AC signal
Output is the power supply signal after being rectified, and the power supply signal is exported through the high voltage bus and the low-voltage bus bar to institute
State bus capacitor, the inverter bridge and the load, wherein the control chip controls the switch according to the AC signal
The on state of element.
In this embodiment, drive control circuit includes power filtering module, and power filtering module is serially connected with AC power source
Between rectification circuit, the AC power source before sample circuit is specifically used for acquisition power filtering module inputs peak voltage signal
And/or the voltage signal after power filtering module before rectification circuit.
According to the second aspect of the invention, a kind of air conditioner is proposed, comprising: motor；And such as any of the above-described technology
Drive control circuit described in scheme, the signal input part of the motor are connected to the drive control circuit, the driving control
The driving signal of circuit output processed is for driving the motor operation.Therefore the air conditioner has described in any of the above-described embodiment
Whole beneficial effects of drive control circuit, details are not described herein.
Additional aspect and advantage of the invention will become obviously in following description section, or practice through the invention
Recognize.
Detailed description of the invention
Above-mentioned and/or additional aspect of the invention and advantage will become from the description of the embodiment in conjunction with the following figures
Obviously and it is readily appreciated that, in which:
Fig. 1 shows AC-DC-exchange topological structure in the prior art；
Fig. 2 shows a kind of drive control circuit schematic diagrames；
Fig. 3 shows the drive control circuit schematic diagram of one embodiment of the present of invention；
Fig. 4 shows the drive control circuit schematic diagram of another embodiment of the invention；
Fig. 5 shows the drive control circuit schematic diagram of yet another embodiment of the present invention；
Fig. 6 shows the drive control circuit schematic diagram of another embodiment of the invention；
Fig. 7 shows the drive control circuit schematic diagram of another embodiment of the invention；
Fig. 8 shows the drive control circuit schematic diagram of another embodiment of the invention；
Fig. 9 shows the drive control circuit schematic diagram of another embodiment of the invention；
Figure 10 shows the drive control circuit schematic diagram of another embodiment of the invention；
Figure 11 shows the drive control circuit schematic diagram of another embodiment of the invention；
Figure 12 shows the drive control circuit schematic diagram of another embodiment of the invention；
Figure 13 shows the control schematic diagram of another embodiment of the invention；
Figure 14 shows the turn-on time schematic diagram of another embodiment of the invention；
Figure 15 shows the flow diagram of another embodiment of the invention.
Wherein, the corresponding relationship between appended drawing reference and component names of the Fig. 2 into Figure 11 are as follows:
102 inverter bridges, 104 switch elements, 106 comparison circuits, 108 control chips, 110 arresting elements, 112 rectified currents
Road.
Specific embodiment
It is with reference to the accompanying drawing and specific real in order to be more clearly understood that aforementioned aspect of the present invention, feature and advantage
Mode is applied the present invention is further described in detail.It should be noted that in the absence of conflict, the implementation of the application
Feature in example and embodiment can be combined with each other.
In the following description, numerous specific details are set forth in order to facilitate a full understanding of the present invention, still, the present invention may be used also
To be implemented using other than the one described here other modes, therefore, protection scope of the present invention is not limited to following public affairs
The limitation for the specific embodiment opened.
The embodiment of first aspect present invention proposes a kind of drive control circuit, as shown in figure 8, drive control circuit packet
Include: inverter bridge 102, inverter bridge 102 are used for drive control load running, and inverter bridge 102 is accessed in high voltage bus and low-voltage bus bar
Between；Bus capacitor C1, the bus capacitor C1It is used to provide the described load and powers on required starting voltage, the bus capacitor
C1It is also used to absorb the surging signal, the bus capacitor C1It accesses in the two buss lines of 102 input side of inverter bridge；
Reactor Ldc drives the surging signal generated during the load running, the electricity for absorbing the drive control circuit
Anti- device Ldc access is between power grid and the load；Sample circuit, for acquiring power supply signal；First surge absorbing circuit, the
One surge absorbing circuit includes: the first resistance element R1With switch element 104, switch element 104 is configured as the first resistance of control
Property element R1Absorb the surging signal on bus, the first resistance element R1With switch element 104 connect after be serially connected in high voltage bus and
Between low-voltage bus bar；Comparison circuit 106, for detecting and confirming that power supply signal is greater than or equal to predeterminated voltage, triggering control core
The interruptive port of piece 108, comparison circuit 106 are connected with sample circuit；Chip 108 is controlled, for according in preset time
The number control switch element 104 that interruptive port is triggered works according to different carrier frequencies, and control chip 108 is first with switch respectively
Part 104 is connected with comparison circuit 106.
The drive control circuit of embodiment according to the present invention is the motor for being driven by inverter bridge, wherein driving
Control circuit includes: inverter bridge 102, bus capacitor C1, reactor Ldc, comparison circuit 106, control chip 108, by first resistance
Property element R1The first surge absorbing circuit formed with switch element 104.Wherein inverter bridge 102 is to motor output drive signal,
Motor operation is controlled, due to bus capacitor C1Capacitance it is lower, therefore the surging signal formed on high voltage bus is unable to ensure
It fully absorbs, therefore concatenation is by the first resistance element R between high voltage bus and low-voltage bus bar1The formed with switch element 104
One surge absorbing circuit, and being arranged for sample circuit to be collected power supply signal, such as: the busbar voltage of high voltage bus and default
The comparison circuit 106 that voltage is compared, in the case where power supply signal is greater than or equal to predeterminated voltage, trigger control chip
108 interruptive port, the number control switch element 104 that control chip 108 is triggered according to interruptive port is according to different carrier waves
Frequency or different duty work, the i.e. working frequency by adjusting switch element 104 are realized and are quickly absorbed within a short period of time
Surging signal, and then realize the voltage for quickly reducing high voltage bus, to avoid the damage of the component in drive control circuit, together
When reduce the first resistance element R1The influence of absorbability caused by being increased because of own temperature.
It is worth noting that for the ease of control surging signal, by setting reactor Ldc come block inverter bridge with exchange
The surging signal that input side generates, multiple predeterminated voltages that wherein predeterminated voltage can be different for numerical value, is greater than in busbar voltage
The interruptive port of trigger control chip 108 when predeterminated voltage, when such as detecting that busbar voltage is more than or equal to the first predeterminated voltage 1,
Interruptive port is triggered, when detecting that busbar voltage is less than or equal to the first predeterminated voltage 2, stops triggering interruptive port, wherein first
Predeterminated voltage 1 is greater than the first predeterminated voltage 2, the setting of predeterminated voltage and bus capacitor C1Surge absoption ability it is related, preset
The setting of time is related to the tolerance situation that circuit components damage.
In one embodiment of the invention, as shown in Fig. 4, Fig. 5, Fig. 7 and Fig. 8, drive control circuit further include: second
Surge absorbing circuit, the second surge absorbing circuit include: the first capacitive element C2With one-way conduction element D1, one-way conduction element
D1It is configured as the first capacitive element C of limitation2Absorb the surging signal on high voltage bus, the first capacitive element C2With one-way conduction
Element D1Series connection.
In this embodiment, by the way that the first capacitive element C is arranged2With one-way conduction element D1Second surge absoption of composition
Circuit, in one-way conduction element D1Meet under turn-on condition, passes through the first capacitive element C2To absorb the letter of the surge on high voltage bus
Number, and then improve the surge absoption ability of drive control circuit, specifically, one-way conduction element D1Anode and high voltage bus phase
Connection, one-way conduction element D1Cathode via the first capacitive element C2It is connected with low-voltage bus bar, wherein one-way conduction element
D1It is the element with one-way conduction characteristic, diode etc..
In one embodiment of the invention, as shown in Fig. 4, Fig. 5, Fig. 7 and Fig. 8, the second surge absorbing circuit further include:
Second resistance element R2, the second resistance element R2For discharging the first capacitive element C2In surging signal, the second resistance element R2
With the first capacitive element C2It is in parallel.
In this embodiment, in the first capacitive element C2After absorbing the surging signal on high voltage bus, setting and the is utilized
One capacitive element C2Second resistance element R in parallel2To discharge the first capacitive element C2In surging signal, the second resistance element
R2Setting improve the reliability of drive control circuit.
In one embodiment of the invention, as shown in Fig. 4, Fig. 5, Fig. 7 and Fig. 8, the second surge absorbing circuit further include:
Second capacitive element C3, for absorbing the surging signal on high voltage bus, the second capacitive element C3With the first capacitive element C2String
Connection.
In this embodiment, when the pressure of high voltage bus is larger, in the first capacitive element C2On the basis of connect second
Capacitive element C3, to improve the absorbability of the surging signal of high voltage bus.
In one embodiment of the invention, as shown in Fig. 4, Fig. 5, Fig. 7 and Fig. 8, the second surge absorbing circuit further include:
Third resistance element R3, third resistance element R3For discharging the second capacitive element C3Middle surging signal, third resistance element R3With
Second capacitive element C3It is in parallel.
In this embodiment, the second capacitive element C is being set3In the case where, by the way that third resistance element R is arranged3With second
Resistance element R2It is used cooperatively, the first capacitive element of Lai Pingheng C2With the second capacitive element C3The voltage at both ends, while third is resistive
Element R3It is also used to the second capacitive element C2On surging signal discharged, to improve the reliability of drive control circuit.
In one embodiment of the invention, further, as shown in Fig. 4, Fig. 5, Fig. 7 and Fig. 8, the second surge absoption electricity
Road further include: the 4th resistance element R4, the first capacitive element C is flowed through for limiting2And/or the second capacitive element C3Electric current；The
Four resistance element R4, the first capacitive element C2It connects with one-way conduction element；Or the 4th resistance element R4, the first capacitive element C2、
Second capacitive element C3It connects with one-way conduction element.
In this embodiment, the 4th resistance element R is additionally provided in the second surge absorbing circuit4, the 4th resistance element R4?
Play limitation in second surge absorbing circuit and flow through the electric current of the second surge absorbing circuit, so improve drive control circuit can
By property, while the 4th resistance element R4The effect for absorbing surging signal in the second surge absorbing circuit is also acted as, and then is improved
The absorbability of the surging signal of second surge absorbing circuit, further for, improve drive control circuit surge letter
Number absorbability.
In one embodiment of the invention, further, as shown in Fig. 2 to Fig. 8, the first surge absorbing circuit is also wrapped
It includes: arresting element 110, for discharging the first resistance element R1In surging signal, arresting element 110 and the first resistance element R1
It is in parallel.
In this embodiment, by the way that arresting element 110 is arranged, in the first resistance element R1Absorb the surge on high voltage bus
After signal, setting and the first resistance element R are utilized1In parallel arresting element discharges the first resistance element R1In surging signal,
The setting of arresting element 110 improves the reliability of drive control circuit.
In an embodiment of the present invention, as shown in Figs. 9 to 11, wherein Fig. 9 is the setting position of surge absorbing circuit in Fig. 5
The embodiment set, Figure 10 and Figure 11 are that the connection that can be implemented of the first surge absorbing circuit and the second surge absorbing circuit is closed
System.Detect that whether there is or not 104 on or off of overcurrent Signal-controlled switch element according to flow element.
In one embodiment of the invention, further, control chip 108 is specifically used for: the middle broken ends of fractured bone in preset time
The number that is triggered of mouth be it is primary, control switch element 104 is according to first carrier frequency (duty ratio is identical) or the first duty ratio
(carrier wave is identical) work；The number that interruptive port is triggered in preset time be it is secondary, control switch element 104 according to second carry
Wave frequency rate (duty ratio is identical) or the second duty ratio (carrier wave is identical) work；Wherein, the second carrier frequency is greater than first carrier frequency
Rate or the second duty ratio are less than the first duty ratio.
In this embodiment, by detecting the number control switch element 104 that interruptive port is triggered within a preset time
It works according to different carrier frequencies, further, since the number being triggered in preset time is more, in order to reduce driving control
The risk of the damage of component in circuit processed, by increasing the carrier frequency or reduce switch that control switch element 104 is run
The duty ratio of element operation, and then reduce the risk of the damage of component.
Further, since predeterminated voltage is set as multiple, detecting that it is pre- that busbar voltage is more than or equal to first
If when voltage 1, i.e., when interruptive port is triggered one time, control switch element 104 works according to first carrier frequency, in bus electricity
Pressure is when gradually rising, and when detecting that busbar voltage is greater than the first predeterminated voltage 1, i.e., when interruptive port is triggered twice, control
Switch element 104 works according to the second carrier frequency, wherein the second carrier frequency is greater than first carrier frequency, and then realizes quick
The voltage of high voltage bus is reduced, to avoid the damage of the component in drive control circuit；It is gradually risen again in busbar voltage
When, and detect busbar voltage be greater than the first predeterminated voltage 1 when, i.e., when interruptive port is triggered three times, control switch element 104
It works according to third carrier frequency；So that the voltage of high voltage bus quickly reduces to avoid first device in drive control circuit
The number that the damage of part, carrier frequency and terminal prot are triggered, which is presented, to be positively correlated, until carrier frequency reaches the maximum of setting
Value.
In one embodiment of the invention, as shown in figure 8 and 13, when model machine powers on, the rectified circuit of input voltage
Bus capacitor C is given after 112 simultaneously1With the first capacitive element C2With the second capacitive element C3Charging, at this time if input voltage is just
In normal setting range (150V~264V), (hardware protection voltage threshold Vref is set as 800V, software protection when being less than 294V
Threshold value is 720V, and corresponding exchange input virtual value is 720/1.414/1.732), model machine works normally, the first resistance element R1
Switch element 104 be not turned on.After charging, the first resistance element R1Both end voltage is stablized in (the i.e. first resistance of Vdc-max value
Property element R1Both end voltage stablizes the maximum value Vdc-max in busbar voltage, or variation is slowly).
When model machine operates normally, bus capacitor C1Upper voltage with alternating current input power supplying frequency multiplied by 6 frequency fluctuation, normally
Busbar voltage maximum value is 264 × 1.414 × 1.732=646V when operation, and much smaller than the protection threshold value of setting, therefore first hinders
Property element R1Switch element 104 will not work.
Compressor winding, the inductance afterflow of alternating current-direct current side when surge energy is mainly derived from power input, model machine disorderly closedown
And compression maneuver energy；When surge comes temporarily, due to the bus capacitor C of low capacity1(thin-film capacitor or low capacity electrolysis electricity
Hold) absorb surge capacity it is limited, busbar voltage can rapid increase, when DC bus-bar voltage be higher than set threshold voltage V2 (herein
It is set as 720V, practical adjustable) when, busbar voltage of the DC bus-bar voltage through divider resistance R6 and R7, after being divided
Into control chip 108 (MCU, micro controller unit micro-control unit) AD mouth (being Vdc into MCU) and
The input terminal of comparator.When busbar voltage after partial pressure is greater than the given threshold of comparison circuit 106, comparison circuit 106 (compares
Device) output from high level becomes low level, and level translation signal enters the external interrupt mouth of MCU.
As shown in Figure 14 and Figure 15, it is judged as that current busbar voltage is more than 720V when MCU receives external interrupt signal, presses
Contracting machine starts downrating or shutdown, while MCU is started with the time window of 30 seconds (can be for other values) in outside
Break signal counts, and different carrier frequency is arranged according to the difference of count value.For example, MCU is considered in 30 seconds first when count value is 1
Secondary surge, at this time the first resistance element R1Temperature is environment temperature, therefore can be absorbed with prestissimo, i.e., by the 1ms of design
Pulse absorbs (burst length is related to resistance and the voltage threshold of setting)；Since resistance transient absorption surge energy can be sent out
Heat, so if 30 seconds count values are 2, to guarantee the first resistance element R1It works normally, uses the 60% of 10K carrier frequency at this time
Duty ratio exports (numerical value is adjustable), while ensuring to be continuously turned on the time no more than 1ms；With the first resistance element R1It absorbs
Surge energy twice, if continuing within 30 seconds have surging signal, i.e., count value is 3, then MCU uses 60% duty ratio of 20K carrier frequency
Output；Further, with the increase of count value, the carrier frequency of the output pulse width modulation of MCU keeps increasing, final carrier frequency limitation
For 40K, wherein 10K, 20K, 40K, be only used for enumerating example within 30 seconds.
Due to the intervention of absorption resistance, busbar voltage understands rapid decrease, when being lower than some fixed threshold (such as 700V),
MCU controls the first resistance element R1Switch element 104 disconnect, the first resistance element R1No longer work.
It is worth noting that the selection of carrier frequency and duty ratio depends mainly on the threshold value V2 that works of setting, first resistive
Element R1Resistance value, the first resistance element R1Rated power and momentary overload capacity (resistance specification gathering of calligraphers embodiment)；It is general next
It says, the first resistance element R1Its bigger momentary overload capacity of rated power it is also bigger, can therefore under identical threshold value V2
It is bigger with the duty ratio opened or carrier frequency is smaller (i.e. the period is bigger).
Specifically, duty ratio is given by formula, for example (Vdc-filter is that real-time detection is female to (Vdc-filter/V2) × T
The voltage value that line voltage obtains after filtering, T are the period of pulse width modulation), while increasing duty-cycle limit link, it is female
The line voltage the big, and the duty ratio exported is bigger, and high busbar voltage high duty ratio can quickly absorb surge energy；It can also make
With remainder formula, the duty ratio such as the bigger output of busbar voltage is smaller, guarantees the reliability etc. of absorption resistance.
About the threshold voltage (being set as fixed 720V and 700V herein) of conducting, the value that can be floating (for example is examined
(Vdc-max is the busbar voltage of several detection cycles before detecting to Vdc-max value before surveying on several detection cycles (such as 100ms)
Maximum value), and using the value add △ V1 as switch element turn off voltage threshold, with Vdc-max+ △ V1+20V (wherein, △ V1
For the float value of voltage, it is configured according to the degrees of tolerance of the component damage of drive control circuit, 20V can be other
Value) it is used as 104 conducting voltage threshold value of switch element.It is, of course, also possible to the peak value for detection exchange input be expanded, to exchange input
Peak value Vac-max+ △ V1 as switching elements conductive voltage threshold, using Vdc-max+ △ V1+20V (can be other values) as
Switching elements conductive voltage threshold.
Over-voltage and the judgement for exiting over-voltage are currently to generate level conversion compared with given threshold by hardware comparator to sentence
Break as over-voltage, software real-time detection busbar voltage (Vdc-filter) after filtering is set as exiting over-voltage lower than some value；
It over-voltage and exits over-voltage and is all given by hardware hysteresis comparator.
About carrier frequency (10K 20K 30K 40K) can all change, but variation tendency should be increasing；When
Between window 30 seconds be also that can change, be based primarily upon be to receive first time over-voltage fault signal from MCU it is normal to complete machine
It shuts down the time needed；The PWM (60%) and counts of fixed duty cycle are also adjustable.
In one embodiment of the invention, as shown in figure 15, control chip 108 is also used to: in the bus of high voltage bus
What voltage was less than predeterminated voltage and switch element 104 is continuously turned on the time greater than in the case where preset duration, stops driving switch
Element 104；Or in the case where the busbar voltage of high voltage bus is less than predeterminated voltage, stop driving switch element 104.
In the technical scheme, it is less than the continuous of predeterminated voltage and switch element in the busbar voltage for detecting high voltage bus
In the case that turn-on time is greater than preset duration, stop driving switch element 104；Or it is less than in advance in the busbar voltage of high voltage bus
If in the case where voltage, stopping driving switch element 104.To avoid using the corresponding absorbing circuit of switch element 104 as mother
Line capacitance uses, and then improves the first resistance element R1 and the service life of other capacitive elements.
As shown in figure 12, R5For system damping resistance, if it is no harmonic requirement region, the preferred small inductor of Ldc (at
This reason), such as less than 2mH can actually not used.If selecting small inductor, best matching system damping resistance promotes system
System stability.
First resistance element R1Resistance value and setting busbar voltage protect threshold value, the overcurrent capability of switch element 104
It is related.
4th resistance element R4And the first capacitive element C2Selection and the first resistance element R1Inductance it is related, if
First resistance element R1It is noninductive resistance, then can use the 4th resistance element R4, the first capacitive element C2And arresting element
110 (anti-paralleled diodes).
The selection of arresting element 110 (anti-paralleled diode) is related to the inductance of the first resistance element R1 and resistance value.
Theoretically, time restriction is continuously turned on using 1ms when counting 1；1ms should be reduced when being counted as 2
Numerical value, for example 0.9ms can be used etc.；0.8ms time restriction etc. is used when count value is 3.It is assumed to be software set 720V to lead
Logical, hardware 800V conducting due to detection filter etc., is actually turned on voltage and is up to 800V.Due to being four resistance series connection,
Therefore maximum voltage is 200V on each resistance.Then (200 × 200/10) × t/1=5W, then t=1.25ms, that is to say, that 1
It should not be more than 1.25ms that the time is continuously turned in time second.
In any of the above-described embodiment, further, bus capacitor C1For thin-film capacitor.
In an embodiment of the invention, as shown in figure 8, rectification circuit 112, the rectification circuit 112 is to AC signal
Output is the power supply signal after being rectified, and the power supply signal is exported through the high voltage bus and the low-voltage bus bar to institute
State bus capacitor C1, the inverter bridge 102 and the load, wherein the control chip controls institute according to the AC signal
State the on state of switch element 104.
In this embodiment, before the voltage signal of high voltage bus can be by reactor Ldc after detection rectification circuit 112
Voltage after voltage or reactor Ldc before inverter bridge 102 obtains, and the voltage signal of AC power source passes through to AC power source VACIt surveys
, such as the alternating voltage peak of AC power source.Optionally, drive control circuit includes power filtering module (not shown), power supply
Filter module is serially connected between AC power source and rectification circuit 112, and sample circuit is specifically used for before acquisition power filtering module
AC power source input peak voltage signal and/or power filtering module after voltage signal before rectification circuit 112.
In one particular embodiment of the present invention, the capacitance of thin-film capacitor is lower than default capacitance, wherein default capacitance is pressed
It is calculated according to following calculation formula:
Wherein, CdcFor preset capacity, LSIt is the total inductance value of equivalent drive control circuit DC side, PLIt is drive control electricity
The bearing power on road, RSFor the all-in resistance of equivalent drive control circuit DC side, vdc0For busbar voltage average value, for example, with 7P
For model machine, C can be determined according to the calculation formuladc840uF is had to be larger than, preset capacity is 840uF or more, is being embodied
When be 1230uF.
The embodiment of second aspect of the present invention proposes a kind of air conditioner, comprising: motor；And such as any of the above-described technical side
Drive control circuit described in case, the signal input part of motor are connected to drive control circuit, the drive of drive control circuit output
Dynamic signal is for driving the motor operation.Therefore the air conditioner has drive control circuit described in any of the above-described embodiment
Whole beneficial effects, details are not described herein.
In the description of this specification, the description of term " one embodiment ", " some embodiments ", " specific embodiment " etc.
Mean that particular features, structures, materials, or characteristics described in conjunction with this embodiment or example are contained at least one reality of the invention
It applies in example or example.In the present specification, schematic expression of the above terms are not necessarily referring to identical embodiment or reality
Example.Moreover, description particular features, structures, materials, or characteristics can in any one or more of the embodiments or examples with
Suitable mode combines.
These are only the preferred embodiment of the present invention, is not intended to restrict the invention, for those skilled in the art
For member, the invention may be variously modified and varied.All within the spirits and principles of the present invention, it is made it is any modification,
Equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (11)
1. a kind of drive control circuit, comprising: inverter bridge, the inverter bridge are used for drive control load running, the inverter bridge
It accesses between high voltage bus and low-voltage bus bar characterized by comprising
Reactor drives the surging signal generated during the load running for absorbing the drive control circuit, described
Reactor accesses between power grid and the load；Sample circuit, for acquiring power supply signal；
Bus capacitor, the bus capacitor are used to provide the described load and power on required starting voltage, and the bus capacitor is also used
In absorbing the surging signal, the bus capacitor access is in the two buss lines of the inverter bridge input side；
First surge absorbing circuit, first surge absorbing circuit include: the first resistance element and switch element, the switch
Element is configured as controlling first resistance element and absorbs surging signal on the bus, first resistance element and institute
It is serially connected between the high voltage bus and the low-voltage bus bar after stating switch element series connection；
Comparison circuit triggers the control chip for detecting and confirming that the power supply signal is greater than or equal to predeterminated voltage
Interruptive port, the comparison circuit are connected with the sample circuit；
Chip is controlled, the number for being triggered according to interruptive port described in preset time controls the switch element according to not
It works with carrier frequency or different duty, the control chip is connected with the switch element and the comparison circuit respectively
It connects.
2. drive control circuit according to claim 1, which is characterized in that further include:
Second surge absorbing circuit, second surge absorbing circuit include: the first capacitive element and one-way conduction element, described
One-way conduction element is configured as limiting first capacitive element and absorbs surging signal on the high voltage bus, and described first
Capacitive element is connected with the one-way conduction element.
3. drive control circuit according to claim 2, which is characterized in that second surge absorbing circuit further include:
Second resistance element, second resistance element are used to discharge surging signal in first capacitive element, and described the
Two resistance elements are in parallel with first capacitive element.
4. drive control circuit according to claim 3, which is characterized in that second surge absorbing circuit further include:
Second capacitive element, for absorbing the surging signal on the high voltage bus, second capacitive element and described first
Capacitive element series connection.
5. drive control circuit according to claim 4, which is characterized in that second surge absorbing circuit further include:
Third resistance element, the third resistance element is for discharging surging signal in second capacitive element, the third
Resistance element is in parallel with second capacitive element.
6. drive control circuit according to claim 5, which is characterized in that second surge absorbing circuit further include:
4th resistance element, for limiting the electric current for flowing through first capacitive element and/or second capacitive element；
4th resistance element, first capacitive element and one-way conduction element series connection；Or described 4th resistive yuan
Part, first capacitive element, the second capacitive element and one-way conduction element series connection.
7. drive control circuit according to claim 1, which is characterized in that first surge absorbing circuit further include:
Arresting element, for discharging the surging signal in first resistance element, the arresting element and described first resistive
Element in parallel.
8. drive control circuit according to claim 1, which is characterized in that the control chip is specifically used for:
The number that the interruptive port is triggered in the preset time be it is primary, control the switch element according to first carrier
Frequency work；
The number that the interruptive port is triggered in the preset time be it is secondary, control the switch element according to the second carrier wave
Frequency work；
Wherein, second carrier frequency is greater than the first carrier frequency.
9. drive control circuit according to claim 1, which is characterized in that the control chip is also used to:
The busbar voltage of the high voltage bus is less than the predeterminated voltage and the time that is continuously turned on of the switch element is greater than in advance
If duration, stop driving the switch element；Or the busbar voltage of the high voltage bus is less than the predeterminated voltage, stops driving
The switch element.
10. drive control circuit according to claim 1, which is characterized in that further include:
Rectification circuit, output is the power supply signal, the power supply signal after the rectification circuit rectifies AC signal
It exports through the high voltage bus and the low-voltage bus bar to the bus capacitor, the inverter bridge and the load,
Wherein, the control chip controls the on state of the switch element according to the AC signal.
11. a kind of air conditioner characterized by comprising
Motor；
Drive control circuit as described in any one of claims 1 to 10, the signal input part of the motor are connected to described
Drive control circuit, the driving signal of the drive control circuit output is for driving the motor operation.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910041249 | 2019-01-16 | ||
| CN201910041249X | 2019-01-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110071624A true CN110071624A (en) | 2019-07-30 |
Family
ID=67371596
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910447793.4A Pending CN110071624A (en) | 2019-01-16 | 2019-05-27 | Drive control circuit and air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110071624A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110518563A (en) * | 2019-09-11 | 2019-11-29 | 广东志高暖通设备股份有限公司 | The method and its MCU of overvoltage protection, air-conditioning equipment |
| CN110829817A (en) * | 2019-11-18 | 2020-02-21 | 广东美的暖通设备有限公司 | Control circuit, control method and device of control circuit and air conditioner |
| CN113612421A (en) * | 2021-08-03 | 2021-11-05 | 珠海格力电器股份有限公司 | Braking circuit control method and device, storage medium and servo motor |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101714826A (en) * | 2004-12-09 | 2010-05-26 | 大金工业株式会社 | Multi-phase current supplying circuit, driving apparatus, compressor, and air conditioner |
| CN102217177A (en) * | 2008-11-13 | 2011-10-12 | 莫斯科技株式会社 | Magnetic energy regeneration switch provided with protection circuit |
| US20130033914A1 (en) * | 2010-04-27 | 2013-02-07 | Hitachi Automotive Systems, Ltd. | Power Conversion Device |
| CN203193496U (en) * | 2013-03-17 | 2013-09-11 | 江苏宝丰新能源科技有限公司 | Large-capacitance self-discharge controller without external power supply |
| CN109038757A (en) * | 2018-09-05 | 2018-12-18 | 国充充电科技江苏股份有限公司 | A kind of discharge type DC grid charging pile system |
| CN209692604U (en) * | 2019-01-16 | 2019-11-26 | 广东美的制冷设备有限公司 | Drive control circuit and air conditioner |
-
2019
- 2019-05-27 CN CN201910447793.4A patent/CN110071624A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101714826A (en) * | 2004-12-09 | 2010-05-26 | 大金工业株式会社 | Multi-phase current supplying circuit, driving apparatus, compressor, and air conditioner |
| CN102217177A (en) * | 2008-11-13 | 2011-10-12 | 莫斯科技株式会社 | Magnetic energy regeneration switch provided with protection circuit |
| US20130033914A1 (en) * | 2010-04-27 | 2013-02-07 | Hitachi Automotive Systems, Ltd. | Power Conversion Device |
| CN203193496U (en) * | 2013-03-17 | 2013-09-11 | 江苏宝丰新能源科技有限公司 | Large-capacitance self-discharge controller without external power supply |
| CN109038757A (en) * | 2018-09-05 | 2018-12-18 | 国充充电科技江苏股份有限公司 | A kind of discharge type DC grid charging pile system |
| CN209692604U (en) * | 2019-01-16 | 2019-11-26 | 广东美的制冷设备有限公司 | Drive control circuit and air conditioner |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110518563A (en) * | 2019-09-11 | 2019-11-29 | 广东志高暖通设备股份有限公司 | The method and its MCU of overvoltage protection, air-conditioning equipment |
| CN110518563B (en) * | 2019-09-11 | 2021-10-22 | 广东志高暖通设备股份有限公司 | Overvoltage protection method, MCU and air conditioning equipment |
| CN110829817A (en) * | 2019-11-18 | 2020-02-21 | 广东美的暖通设备有限公司 | Control circuit, control method and device of control circuit and air conditioner |
| CN113612421A (en) * | 2021-08-03 | 2021-11-05 | 珠海格力电器股份有限公司 | Braking circuit control method and device, storage medium and servo motor |
| CN113612421B (en) * | 2021-08-03 | 2024-07-19 | 珠海格力电器股份有限公司 | Brake circuit control method and device, storage medium and servo motor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9263939B2 (en) | Capacitor discharging circuit and converter | |
| CN110071624A (en) | Drive control circuit and air conditioner | |
| CN206195631U (en) | Efficient half -bridge resonance AC DC converter | |
| US10270328B2 (en) | Multilevel converter with energy storage | |
| WO2020147239A1 (en) | Drive control circuit, air conditioner and controller | |
| CN107370404A (en) | Integrated PFC high voltage half-bridge resonance synchronous rectification AC/DC power modules | |
| CN104269999A (en) | Closed loop starting method for resonant converter | |
| CN110112899A (en) | Drive control circuit and air conditioner | |
| CN209676119U (en) | Drive control circuit and air conditioner | |
| CN209692604U (en) | Drive control circuit and air conditioner | |
| CN203057605U (en) | Low stroboflash driving circuit and LED lamp employing low stroboflash driving circuit | |
| CN209627230U (en) | Drive control circuit, air-conditioner controller and air conditioner | |
| CN102804593A (en) | Motor control device | |
| CN209627225U (en) | Drive control circuit, air-conditioner controller and air conditioner | |
| CN110207341B (en) | Drive control circuit and air conditioner | |
| CN209608541U (en) | Drive control circuit and air conditioner | |
| CN209608542U (en) | Drive control circuit, air-conditioner controller and air conditioner | |
| CN110071626A (en) | Drive control circuit and air conditioner | |
| CN209627229U (en) | Drive control circuit and air conditioner | |
| CN209627227U (en) | Drive control circuit, air-conditioner controller and air conditioner | |
| CN102946186A (en) | Active harmonic suppressing mechanism | |
| WO2022218255A1 (en) | Charging apparatus | |
| CN113346731B (en) | Compressor shutdown circuit and method and air conditioner | |
| CN110086332A (en) | Drive control circuit, air-conditioner controller and air conditioner | |
| CN209608540U (en) | Drive control circuit, air-conditioner controller and air conditioner |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |