CN104810797B - Phase terminal shortcircuit protects circuit and alternating current generator - Google Patents
Phase terminal shortcircuit protects circuit and alternating current generator Download PDFInfo
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- CN104810797B CN104810797B CN201410031734.6A CN201410031734A CN104810797B CN 104810797 B CN104810797 B CN 104810797B CN 201410031734 A CN201410031734 A CN 201410031734A CN 104810797 B CN104810797 B CN 104810797B
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Abstract
The present invention relates to phase terminal shortcircuit protection circuit and alternating current generators; alternating current generator has excitation control circuit and field switch; phase terminal shortcircuit protection circuit is arranged in parallel with excitation control circuit; and phase terminal shortcircuit protects circuit and the input terminal of excitation control circuit all connects the excitation end of alternating current generator, output terminal all connects field switch; phase terminal shortcircuit protection circuit includes voltage detection unit, control switch, control switch positive closing unit and switch power supply unit, and whether voltage detection unit is used to detect the voltage at excitation end higher than a predetermined voltage；Control switch disconnects field switch when conducting；Control switch positive closing unit disconnects control switch when the voltage at excitation end is higher than predetermined voltage；Switch power supply unit conducting control switch when the voltage at excitation end is less than predetermined voltage.The present invention can disconnect excitation control circuit when short circuit occurs, so as to protect alternating current generator.
Description
Technical field
The present invention relates to a kind of alternating current generator, specifically, being to be related to its phase terminal shortcircuit protection circuit.The present invention also relates to
And the phase terminal shortcircuit guard method of alternating current generator.
Background technology
At present, the vehicle alternator voltage control system overwhelming majority will not use process in vehicle in the design process
In due to circuit question may caused by phase end shorted to earth problem take into account, and at present at user by generator phase end group
This is intercepted for signal, and relay switch control etc. is usually no more than the small load of 1A, and thinner mutually end is conventionally selected at this
Lead wire.During such issues that when occur, one larger short circuit current of generation over the ground is mutually held, considerably beyond the allowable of existing configuration
Safe current value, therefore will appear and mutually hold lead wire since long-time is by high current, line footpath, which is more carefully located to overheat, blows, and may lead
Lead wire insulation skin over hot melting is caused, which can emit bad smell, and smog be generated, such as combustion phenomena；User is if it find that this feelings
Condition can raise fear, and consequence is quite serious.
Invention content
A technical problem to be solved by this invention is to provide a kind of phase terminal shortcircuit protection circuit, to avoid electric generating
Machine mutually holds correlated parts because generating ablation during alternating current generator phase terminal shortcircuit, so as to protect alternating current generator and each vehicle-mounted electricity consumption
Device.
To achieve these goals, the present invention provides a kind of phase terminal shortcircuit protection circuit, is connect with an alternating current generator, institute
Alternating current generator is stated with excitation control circuit and field switch, the phase terminal shortcircuit protects circuit and the excitation control circuit
It is arranged in parallel, and phase terminal shortcircuit protection circuit all connect encouraging for alternating current generator with the input terminal of the excitation control circuit
Magnetic end, output terminal all connect the field switch, and the phase terminal shortcircuit protection circuit includes：
Voltage detection unit, for whether detecting the voltage at the excitation end higher than a predetermined voltage；
Control switch disconnects the field switch when conducting；
Control switch positive closing unit disconnects the control when voltage at excitation end is higher than the predetermined voltage and opens
It closes；And
Power supply unit is switched, the control switch is connected when the voltage at excitation end is less than the predetermined voltage.
Above-mentioned phase terminal shortcircuit protection circuit, wherein, the alternating current generator has voltage modulator circuit, the phase end
Short-circuit protection circuit is embedded in the voltage modulator circuit or, phase terminal shortcircuit protection circuit is arranged on the voltage
Outside adjuster circuit.
Above-mentioned phase terminal shortcircuit protection circuit, wherein, the phase terminal shortcircuit protection circuit is set to the alternating current generator
An internal part as generator control circuit.
Above-mentioned phase terminal shortcircuit protection circuit, wherein, the voltage detection unit is zener diode.
Above-mentioned phase terminal shortcircuit protection circuit, wherein, the control switch is triode, field-effect tube or Darlington transistor.
Above-mentioned phase terminal shortcircuit protection circuit, wherein, the switch power supply unit is storage capacitor.
Another technical problem to be solved by this invention is to provide a kind of alternating current generator, which is avoided that
Phase end correlated parts during alternating current generator phase terminal shortcircuit because generating ablation, so as to protect alternating current generator and each vehicle-mounted electrical appliance.
To achieve these goals, alternating current generator provided by the invention has excitation control circuit and field switch, also
Circuit is protected with a phase terminal shortcircuit, the phase terminal shortcircuit protection circuit is arranged in parallel, and described with the excitation control circuit
Circuit all connect the excitation end of alternating current generator to the protection of phase terminal shortcircuit with the input terminal of the excitation control circuit, output terminal all connects
The field switch is connect, the phase terminal shortcircuit protection circuit includes：
Voltage detection unit, for whether detecting the voltage at the excitation end higher than a predetermined voltage；
Control switch disconnects the field switch when conducting；
Control switch positive closing unit disconnects the control when voltage at excitation end is higher than the predetermined voltage and opens
It closes；And
Power supply unit is switched, the control switch is connected when the voltage at excitation end is less than the predetermined voltage.
Above-mentioned alternating current generator, wherein, the alternating current generator has voltage modulator circuit, and the phase terminal shortcircuit is protected
Protection circuit is embedded in the voltage modulator circuit or, phase terminal shortcircuit protection circuit is arranged on the voltage regulator
Outside circuit.
Above-mentioned alternating current generator, wherein, the phase terminal shortcircuit protection circuit, which is set to inside the alternating current generator, to be made
A part for generator control circuit.
Above-mentioned alternating current generator, wherein, the control switch is triode, field-effect tube or Darlington transistor.
Above-mentioned alternating current generator, wherein, the switch power supply unit is storage capacitor.
The present invention further provides a kind of phase terminal shortcircuit guard method of alternating current generator, the alternating current generator, which has, encourages
Control circuit and field switch, the phase terminal shortcircuit that this method is arranged in parallel by one with the excitation control circuit protect circuit
Alternating current generator is protected, is included the following steps：
S100, whether the voltage at detection alternating current generator excitation end is higher than a predetermined voltage, if so, carrying out step
S200, if it is not, then carrying out step S300；
S200, the control switch that control switch positive closing unit disconnection is connect with the field switch, so that it is to encouraging
Magnetic switch is without control；
S300, the control switch that switch power supply unit conducting is connect with the field switch, so that the excitation con-trol is electric
Road disconnects.
The beneficial functional of the present invention is, the setting of circuit is protected by phase terminal shortcircuit, can be by excitation when short circuit occurs
Control circuit disconnects, so as to protect alternating current generator.
Below in conjunction with the drawings and specific embodiments, the present invention will be described in detail, but not as a limitation of the invention.
Description of the drawings
Each terminal voltage of alternating current generator changes test curve figure when Fig. 1 is phase terminal shortcircuit；
Fig. 2 is the circuit diagram of alternating current generator of the present invention；
Fig. 3 is that the phase terminal shortcircuit of alternating current generator of the present invention protects work flow diagram.
Wherein, reference numeral
100-alternating current generator
10-excitation control circuit
20-field switch
30-phase terminal shortcircuit protects circuit
31-voltage detection unit
32-control switch
33-control switch positive closing unit
34-switch power supply unit
40-voltage modulator circuit
S100~S300 steps
Specific embodiment
Technical solution of the present invention is described in detail in the following with reference to the drawings and specific embodiments, to be further understood that
The purpose of the present invention, scheme and effect, but it is not intended as the limitation of scope of the appended claims of the present invention.
The present invention, using for field-effect tube, illustrates operation principle by each switch.
By taking 28V alternator systems as an example, each terminal voltage variation test of alternating current generator is bent when Fig. 1 is phase terminal shortcircuit
Line can clearly be seen from curve, and when mutually end shorted to earth occurs, excitation terminal voltage can be in substantially oscillatory regime, this is
The foundation of protection philosophy in the present invention.When detecting finds short circuit, excitation terminal voltage becomes large amplitude from small amplitude oscillation moment and shakes
It swings, amplitude reaches 24V or so, it is contemplated that amplitude of oscillation when alternating current generator works normally prevents the erroneous judgement of normal condition, this reality
Excitation end detecting voltage is applied using 8.2V (detecting voltage herein is predetermined voltage described hereinafter), different system needs root
Factually border test result confirms detecting voltage value.
Fig. 2 is alternator circuit schematic diagram according to the present invention, and alternating current generator 100 has excitation control circuit
10th, 20 and one phase terminal shortcircuit of field switch protection circuit 30.Phase terminal shortcircuit protection circuit 30 is in parallel with excitation control circuit 10
Setting, and phase terminal shortcircuit protection circuit 30 and the input terminal of excitation control circuit 10 all connect alternating current generator excitation end D+,
Output terminal all connects field switch 20.Phase terminal shortcircuit protection circuit 30 includes voltage detection unit 31, control switch 32, controls and open
Close positive closing unit 33 and switch power supply unit 34.Whether the voltage that voltage detection unit 31 is used to detect excitation end is higher than
One predetermined voltage；Control switch 32 disconnects field switch 20 when conducting；Control switch positive closing unit 33 is in excitation end
Voltage disconnects control switch 32 when being higher than predetermined voltage；Switch power supply unit 34 is led when the voltage at excitation end is less than predetermined voltage
Logical control switch 32.
The present invention operation principle be：Excitation end D+ voltages mainly provide 10 detection signal of excitation control circuit and mutually hold short
30 detection signal of circuit is protected on road, and the output terminal of 10 Ji Xiangduan roads of excitation control circuit protection circuit 30 is all connected with field switch
20, two parts circuit in parallel connection, when alternating current generator works normally, such as zener diode of voltage detection unit 31 to
Phase terminal shortcircuit protects 30 input voltage of circuit and is maintained at 8.2V, and control switch positive closing unit 33 is in positive closing always
The control stage will control the control terminal voltage of switch 32 (such as triode, field-effect tube, Darlington transistor) to force to drag down, sternly
Lattice will control switch 32 in open position, therefore to field switch 20 without control, and field switch 20 is according only to excitation at this time
It is worked normally under the input signal of control circuit 10；On the contrary, when mutually holding generation short circuit over the ground, due to the D+ voltage drops of excitation end
Low, voltage detection unit 31 is in open-circuit condition, and 33 control terminal of control switch positive closing unit is in low-potential state, loses
To the control action of control switch 32, and when generator works normally, unanimously the switch in charging energy-storing state is powered at this time
Such as storage capacitor of unit 34 starts electric discharge and provides control switch 32 high-order voltage signal, and excitation is opened in 32 conducting of control switch
It closes 20 control terminal voltage pressures and is placed in low potential, so as to close alternating current generator excitation signal, protect alternating current generator.
In embodiment shown in Fig. 2, phase terminal shortcircuit protection circuit 30 returns in voltage modulator circuit 40 from excitation
Excitation voltage signal is detected in road, when defencive function is opened, forces to turn off operation to field switch 20；Entire voltage is adjusted
Excitation end D+, brush end F and the ground terminal E of device circuit 40 are connect with 100 complete machine of alternating current generator, so as to reach control generator
The purpose of output voltage.In actual use, circuit 30 can also be protected to be placed in outside voltage modulator circuit 40 phase terminal shortcircuit
Portion can also be placed in a part of the generator as generator control circuit；When the generator is used for vehicle, can also incite somebody to action
Phase terminal shortcircuit protection circuit 30 is placed in inside the outer vehicle of generator, and as the part in full-vehicle control circuit, phase end can be achieved
Shorted to earth defencive function.
From the aforegoing it can be seen that there is the alternating current generator of the present invention phase terminal shortcircuit to protect circuit, can occur over the ground at mutually end
When short-circuit, generator is avoided mutually to hold correlated parts ablation due to the excessive short circuit current of generation, so as to protect alternating current generator
And each vehicle-mounted electrical appliance.Actual test finds when mutually holding shorted to earth state, and when short circuit occurs, excitation terminal voltage can be from relatively connecing
Voltage when nearly generator normally exports declines close to 0V in moment, and with amplitude close to the state persistent oscillation of 24V, because
This using this actual test as a result, constantly detect excitation terminal voltage, when occur drastically decline close to 0V in short-term when, that is, send out
Reveal existing phase end shorted to earth.In the system, whether the excitation terminal voltage of generator is used for detecting and mutually holds in short-circuit shape
State, so as to judge whether to need to be closed protection control switch with positive closing field switch, the short circuit electricity so as to which mutually end be generated
Flow control is in a relatively low range.The zener diode of a dimension can be used in detection threshold, is connected to excitation end, when
When excitation terminal voltage is higher than 8.2V, which remains conducting state, and conducting voltage is 8.2V, that is, entire phase terminal shortcircuit
Protection circuit voltage is 8.2V.And the effect of control switch positive closing unit is generated when being worked normally by generator
High potential keep subsequent control switch --- being used herein as field-effect tube --- grid be constantly in connected state over the ground, control
Switch remains off, therefore the excitation of entire generator will not be had an impact；But when excitation terminal voltage drops in short-term
During below 8.2V, the zener diode for detecting voltage cannot keep on-state, that is, when there is short circuit, alternating current generator system
System can not provide the high potential input that control switch positive closing unit is kept to close, and control the grid of switch at this time by a power supply
Unit --- capacitance for being used herein as dimension --- is constantly in energy storage state when generator works normally, and is sent out in short circuit
The grid high potential of field-effect tube conducting that control switch uses can be provided as by being provided when raw, therefore be opened in control switch with excitation
Diode between pass is connected due to the conducting of control switch, field switch is forced to disconnect, so as to protect alternating current generator
System.
The present invention provides the phase terminal shortcircuit guard method of ground alternating current generator, in parallel with excitation control circuit is set by one
The phase terminal shortcircuit protection circuit put protects alternating current generator, and with reference to refering to Fig. 3, the guard method of phase terminal shortcircuit includes as follows
Step：
S100, whether the voltage at detection alternating current generator excitation end is higher than a predetermined voltage, if so, carrying out step
S200, if it is not, then carrying out step S300；
S200, the control switch that control switch positive closing unit disconnection is connect with the field switch, so that it is to encouraging
Magnetic switch is without control；
S300, the control switch that switch power supply unit conducting is connect with the field switch, so that the excitation con-trol is electric
Road disconnects.
In above-mentioned steps S100, including excitation terminal voltage detecting S101 and judge whether excitation terminal voltage is predetermined higher than one
Voltage (such as 8.2V) S102.
In above-mentioned steps S200, conducting S301 is closed including control switch positive closing unit, switch power supply unit without
Method offer high potential S202, control switch open S203 and field switch action without influence S204.
In above-mentioned steps S300, positive closing unit attonity S301 is switched including control, switch power supply unit starts
Power S302, and control switch is closed conducting S303 and field switch disconnects S304.
Certainly, the present invention can also have other various embodiments, without deviating from the spirit and substance of the present invention, ripe
It knows those skilled in the art and makes various corresponding changes and deformation, but these corresponding changes and change in accordance with the present invention
Shape should all belong to the protection domain of appended claims of the invention.
Claims (10)
1. a kind of phase terminal shortcircuit protects circuit, it is connect with an alternating current generator, the alternating current generator has excitation control circuit
And field switch, which is characterized in that the phase terminal shortcircuit protection circuit is arranged in parallel, and the phase with the excitation control circuit
Circuit all connect the excitation end of alternating current generator with the input terminal of the excitation control circuit, output terminal all connects for terminal shortcircuit protection
The field switch, the phase terminal shortcircuit protection circuit include：
Voltage detection unit, for whether detecting the voltage at the excitation end higher than a predetermined voltage；
Control switch disconnects the field switch when conducting；
Control switch positive closing unit disconnects the control switch when voltage at excitation end is higher than the predetermined voltage；With
And
Power supply unit is switched, the control switch is connected when the voltage at excitation end is less than the predetermined voltage；
Wherein, the voltage detection unit is zener diode.
2. phase terminal shortcircuit according to claim 1 protects circuit, which is characterized in that the alternating current generator has voltage tune
Device circuit is saved, the phase terminal shortcircuit protection circuit is in the voltage modulator circuit or, phase terminal shortcircuit protection is electric
Road is arranged on outside the voltage modulator circuit.
3. phase terminal shortcircuit according to claim 1 protects circuit, which is characterized in that the phase terminal shortcircuit protection circuit setting
A part inside the alternating current generator as generator control circuit.
4. the phase terminal shortcircuit protection circuit according to any one in claim 1-3, which is characterized in that the control switch
For triode, field-effect tube or Darlington transistor.
5. the phase terminal shortcircuit protection circuit according to any one in claim 1-3, which is characterized in that the switch power supply
Unit is storage capacitor.
6. a kind of alternating current generator has excitation control circuit and field switch, which is characterized in that is also protected with a phase terminal shortcircuit
Protection circuit, the phase terminal shortcircuit protection circuit are arranged in parallel with the excitation control circuit, and phase terminal shortcircuit protection circuit
All connect the excitation end of alternating current generator with the input terminal of the excitation control circuit, output terminal all connects the field switch,
The phase terminal shortcircuit protection circuit includes：
Voltage detection unit, for whether detecting the voltage at the excitation end higher than a predetermined voltage；
Control switch disconnects the field switch when conducting；
Control switch positive closing unit disconnects the control switch when voltage at excitation end is higher than the predetermined voltage；With
And
Power supply unit is switched, the control switch is connected when the voltage at excitation end is less than the predetermined voltage；
Wherein, the voltage detection unit is zener diode.
7. alternating current generator according to claim 6, which is characterized in that also with voltage modulator circuit, the phase end
Short-circuit protection circuit is embedded in the voltage modulator circuit or, phase terminal shortcircuit protection circuit is arranged on the voltage
Outside adjuster circuit.
8. alternating current generator according to claim 6, which is characterized in that the phase terminal shortcircuit protection circuit is set to described
A part inside alternating current generator as generator control circuit.
9. according to the alternating current generator described in any one in claim 6-8, which is characterized in that the control switch is three poles
Pipe, field-effect tube or Darlington transistor.
10. according to the alternating current generator described in any one in claim 6-8, which is characterized in that the switch power supply unit
For storage capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410031734.6A CN104810797B (en) | 2014-01-23 | 2014-01-23 | Phase terminal shortcircuit protects circuit and alternating current generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410031734.6A CN104810797B (en) | 2014-01-23 | 2014-01-23 | Phase terminal shortcircuit protects circuit and alternating current generator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104810797A CN104810797A (en) | 2015-07-29 |
| CN104810797B true CN104810797B (en) | 2018-07-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410031734.6A Active CN104810797B (en) | 2014-01-23 | 2014-01-23 | Phase terminal shortcircuit protects circuit and alternating current generator |
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| Country | Link |
|---|---|
| CN (1) | CN104810797B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110829914B (en) * | 2019-11-08 | 2021-07-09 | 陕西航空电气有限责任公司 | Wide-range short-circuit current limiting device of three-phase alternating-current generator |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101026356A (en) * | 2006-02-16 | 2007-08-29 | 株式会社电装 | Vehicle generator |
| US20070241724A1 (en) * | 2006-04-17 | 2007-10-18 | Denso Corporation | Vehicle generator control device |
| CN101483333A (en) * | 2007-12-28 | 2009-07-15 | 车王电子股份有限公司 | Short circuit protection apparatus for electricity generator |
| CN101572525A (en) * | 2009-05-25 | 2009-11-04 | 刘芳彪 | Generator excitation unit |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4670720B2 (en) * | 2006-04-21 | 2011-04-13 | 株式会社デンソー | Vehicle power generation control device |
| CN203070746U (en) * | 2012-12-31 | 2013-07-17 | 张立君 | D key code position drawing board capable of preventing zither panel from being poked |
-
2014
- 2014-01-23 CN CN201410031734.6A patent/CN104810797B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101026356A (en) * | 2006-02-16 | 2007-08-29 | 株式会社电装 | Vehicle generator |
| US20070241724A1 (en) * | 2006-04-17 | 2007-10-18 | Denso Corporation | Vehicle generator control device |
| CN101483333A (en) * | 2007-12-28 | 2009-07-15 | 车王电子股份有限公司 | Short circuit protection apparatus for electricity generator |
| CN101572525A (en) * | 2009-05-25 | 2009-11-04 | 刘芳彪 | Generator excitation unit |
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| Publication number | Publication date |
|---|---|
| CN104810797A (en) | 2015-07-29 |
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