CN104810797A - Phase end short circuit protection circuit, alternating current generator and phase end short circuit protection method thereof - Google Patents
Phase end short circuit protection circuit, alternating current generator and phase end short circuit protection method thereof Download PDFInfo
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- CN104810797A CN104810797A CN201410031734.6A CN201410031734A CN104810797A CN 104810797 A CN104810797 A CN 104810797A CN 201410031734 A CN201410031734 A CN 201410031734A CN 104810797 A CN104810797 A CN 104810797A
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Abstract
The invention relates to a phase end short circuit protection circuit, an alternating current generator and a phase end short circuit protection method thereof. The alternating current generator is provided with an excitation control circuit and an excitation switch. The phase end short circuit protection circuit and the excitation control circuit are arranged in a parallel connection mode, the input end of the phase end short circuit protection circuit and the input end of the excitation control circuit are connected to an excitation end of the alternating current generator, and the output end of the phase end short circuit protection circuit and the output end of the excitation control circuit are connected to the excitation switch, the phase end short circuit protection circuit comprises a voltage detection unit, a control switch, a control switch forcibly closing unit and a switch power supply unit, and the voltage detection unit is used for detecting whether voltage at the excitation end is higher than predetermined voltage or not; the control switch turns off the excitation switch during conduction; the control switch forcibly closing unit turns off the control switch when the voltage at the excitation end is higher than the predetermined voltage; and the switch power supply unit turns on the control switch when the voltage at the excitation end is lower than the predetermined voltage. The phase end short circuit protection circuit can break the excitation control circuit when a short circuit occurs, thereby being capable of protecting the alternating current generator.
Description
Technical field
The present invention relates to a kind of alternating current generator, specifically, relate to its phase terminal shortcircuit protective circuit.The invention still further relates to the phase terminal shortcircuit guard method of alternating current generator.
Background technology
At present, the shorted to earth of the end mutually problem that may cause due to circuit question in vehicle use procedure is not taken into account by the vehicle alternator voltage control system overwhelming majority in the design process, and generator phase end group is originally used for signal intercepting by user place at present, relay switch control etc. is generally no more than the little load of 1A, and conventionally this place selects the thinner lead wire of end mutually.When there is this kind of problem, hold the short circuit current that generation one is larger over the ground mutually, considerably beyond the safety electric flow valuve allowable of existing configuration, therefore there will be and hold lead wire owing to passing through big current for a long time mutually, wire diameter more carefully locates overheated blowing, and may cause lead wire insulation skin over hot melting, this process can emit bad smell, produce smog, as combustion phenomena; If user finds this situation, can raise fear, consequence is quite serious.
Summary of the invention
A technical problem to be solved by this invention is, provides a kind of phase terminal shortcircuit protective circuit, to avoid alternator for vehicle to hold correlated parts because producing ablation during alternating current generator phase terminal shortcircuit mutually, thus protection alternating current generator and each vehicle-mounted electrical equipment.
To achieve these goals; the invention provides a kind of phase terminal shortcircuit protective circuit; be connected with an alternating current generator; described alternating current generator has excitation control circuit and field switch; described phase terminal shortcircuit protective circuit and described excitation control circuit are arranged in parallel; and described phase terminal shortcircuit protective circuit and the input of described excitation control circuit are all connected the excitation end of alternating current generator, output all connects described field switch, described phase terminal shortcircuit protective circuit comprises:
Whether voltage detection unit, for detecting the voltage of described excitation end higher than a predetermined voltage;
Control switch, disconnects described field switch when conducting;
Control switch positive closing unit, in the voltage of excitation end higher than disconnecting described control switch during described predetermined voltage; And
Switch power supply unit, in the voltage of excitation end lower than control switch described in conducting during described predetermined voltage.
Above-mentioned phase terminal shortcircuit protective circuit, wherein, described alternating current generator has voltage modulator circuit, and described phase terminal shortcircuit protective circuit is embedded in described voltage modulator circuit, or described phase terminal shortcircuit protective circuit is arranged on outside described voltage modulator circuit.
Above-mentioned phase terminal shortcircuit protective circuit, wherein, described phase terminal shortcircuit protective circuit is arranged at the inner part as generator control loop of described alternating current generator.
Above-mentioned phase terminal shortcircuit protective circuit, wherein, described voltage detection unit is voltage stabilizing didoe.
Above-mentioned phase terminal shortcircuit protective circuit, wherein, described control switch is triode, field effect transistor or Darlington transistor.
Above-mentioned phase terminal shortcircuit protective circuit, wherein, described switch power supply unit is storage capacitor.
Another technical problem to be solved by this invention provides a kind of alternating current generator, and this alternative electric generation function is avoided holding correlated parts because producing ablation during alternating current generator phase terminal shortcircuit mutually, thus protection alternating current generator and each vehicle-mounted electrical equipment.
To achieve these goals; alternating current generator provided by the invention; there is excitation control circuit and field switch; also there is a phase terminal shortcircuit protective circuit; described phase terminal shortcircuit protective circuit and described excitation control circuit are arranged in parallel; and described phase terminal shortcircuit protective circuit and the input of described excitation control circuit are all connected the excitation end of alternating current generator, output all connects described field switch, described phase terminal shortcircuit protective circuit comprises:
Whether voltage detection unit, for detecting the voltage of described excitation end higher than a predetermined voltage;
Control switch, disconnects described field switch when conducting;
Control switch positive closing unit, in the voltage of excitation end higher than disconnecting described control switch during described predetermined voltage; And
Switch power supply unit, in the voltage of excitation end lower than control switch described in conducting during described predetermined voltage.
Above-mentioned alternating current generator, wherein, described alternating current generator has voltage modulator circuit, and described phase terminal shortcircuit protective circuit is embedded in described voltage modulator circuit, or described phase terminal shortcircuit protective circuit is arranged on outside described voltage modulator circuit.
Above-mentioned alternating current generator, wherein, described phase terminal shortcircuit protective circuit is arranged at the inner part as generator control loop of described alternating current generator.
Above-mentioned alternating current generator, wherein, described control switch is triode, field effect transistor or Darlington transistor.
Above-mentioned alternating current generator, wherein, described switch power supply unit is storage capacitor.
The present invention further provides a kind of phase terminal shortcircuit guard method of alternating current generator; described alternating current generator has excitation control circuit and field switch; the phase terminal shortcircuit protective circuit that this method is arranged in parallel with described excitation control circuit by one is protected alternating current generator, comprises the steps:
S100, the voltage detecting alternating current generator excitation end, whether higher than a predetermined voltage, if so, then carries out step S200, if not, then carry out step S300;
S200, control switch positive closing unit disconnects the control switch be connected with described field switch, to make it to field switch without control;
S300, the control switch that the conducting of switch power supply unit is connected with described field switch, disconnects to make described excitation control circuit.
Beneficial functional of the present invention is, by the setting of phase terminal shortcircuit protective circuit, excitation control circuit can be disconnected when short circuit occurs, thus can protect alternating current generator.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Accompanying drawing explanation
Alternating current generator each terminal voltage change test curve figure when Fig. 1 is phase terminal shortcircuit;
Fig. 2 is the circuit theory diagrams of alternating current generator of the present invention;
Fig. 3 is the phase terminal shortcircuit protection workflow diagram of alternating current generator of the present invention.
Wherein, Reference numeral
100-alternating current generator
10-excitation control circuit
20-field switch
30-phase terminal shortcircuit protective 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 step
Embodiment
Below in conjunction with the drawings and specific embodiments, technical solution of the present invention is described in detail, further to understand object of the present invention, scheme and effect, but not as the restriction of claims protection range of the present invention.
The present invention all uses field effect transistor for each switch, illustrates operation principle.
For 28V alternator system; when Fig. 1 is phase terminal shortcircuit, alternating current generator each terminal voltage change test curve, can clearly see, when holding shorted to earth to occur mutually from curve; excitation terminal voltage can in significantly oscillatory regime, and this is the foundation of protection philosophy in the present invention.When detecting finds short circuit, excitation terminal voltage becomes large amplitude vibration instantaneously from small amplitude oscillation, amplitude reaches about 24V, consider amplitude of oscillation when alternating current generator normally works, prevent the erroneous judgement of normal condition, the present embodiment excitation end detecting voltage adopts 8.2V(detecting voltage to be herein hereinafter described predetermined voltage), different system need confirm detecting voltage value according to actual test result.
Fig. 2 is alternator circuit schematic diagram involved in the present invention, and alternating current generator 100 has excitation control circuit 10, field switch 20 and a phase terminal shortcircuit protective circuit 30.Phase terminal shortcircuit protective circuit 30 and excitation control circuit 10 are arranged in parallel, and phase terminal shortcircuit protective circuit 30 and the input of excitation control circuit 10 are all connected the excitation end D+ of alternating current generator, output all connects field switch 20.Phase terminal shortcircuit protective circuit 30 comprises voltage detection unit 31, control switch 32, control switch positive closing unit 33 and switch power supply unit 34.Whether voltage detection unit 31 is for detecting the voltage of excitation end higher than a predetermined voltage; Control switch 32 disconnects field switch 20 when conducting; Control switch positive closing unit 33 disconnects control switch 32 in the voltage of excitation end higher than during predetermined voltage; Switch power supply unit 34 in the voltage of excitation end lower than conducting control switch 32 during predetermined voltage.
Operation principle of the present invention is: excitation end D+ voltage mainly provides excitation control circuit 10 detection signal and phase terminal shortcircuit protective circuit 30 detection signal, and the output of excitation control circuit 10 Ji Xiangduan road protective circuit 30 all connects field switch 20, this two parts circuit in parallel connects, when alternating current generator normally works, voltage detection unit 31 such as voltage stabilizing didoe is to phase terminal shortcircuit protective circuit 30 input voltage and remain on 8.2V, control switch positive closing unit 33 is in positive closing all the time and controls the stage, by control switch 32 (such as triode, field effect transistor, Darlington transistor) control end voltage force drag down, strictly control switch 32 is in open position, therefore to field switch 20 without control, and now field switch 20 only according to normally working under the input signal of excitation control circuit 10, on the contrary, when hold mutually be short-circuited over the ground time, because excitation end D+ voltage reduces, voltage detection unit 31 is in open-circuit condition, control switch positive closing unit 33 control end is in low-potential state, lose the control action to control switch 32, and charging energy-storing state of switch power supply unit 34 such as storage capacitor is now unanimously in when generator normally works, starting electric discharge provides control switch 32 high-order voltage signal, control switch 32 conducting, field switch 20 control end voltage is forced to be placed in electronegative potential, thus close alternating current generator excitation signal, protection alternating current generator.
In embodiment shown in Fig. 2, phase terminal shortcircuit protective circuit 30 is embedded in voltage modulator circuit 40, detects exciting voltage signal from energized circuit, when defencive function is opened, forces to carry out opening operation to field switch 20; Excitation end D+, the brush end F of whole voltage modulator circuit 40 and earth terminal E are connected with alternating current generator 100 complete machine, thus reach the object controlling generator output voltage.In actual use, phase terminal shortcircuit protective circuit 30 can also be placed in voltage modulator circuit 40 outside, the part of generator as generator control loop can also be placed in; When this generator is used for vehicle, also phase terminal shortcircuit protective circuit 30 can be placed in the outer car load of generator inner, as the part in full-vehicle control loop, all can realizes holding shorted to earth defencive function mutually.
As can be seen from above; alternating current generator of the present invention has phase terminal shortcircuit protective circuit; can, when shorted to earth appears in end mutually, generator be avoided to hold correlated parts ablation because of the excessive short circuit current produced mutually, thus protection alternating current generator and each vehicle-mounted electrical equipment.Actual test is held mutually during shorted to earth state and is found, when short circuit occurs, excitation terminal voltage can decline close to 0V from voltage when comparatively normally exporting close to generator instantaneously, and vibrate with the state continuance of amplitude close to 24V, therefore the result of this actual test is utilized, detecting excitation terminal voltage constantly, when occurring sharply declining close to 0V in short-term, namely finding to occur holding shorted to earth mutually.In this system, the excitation terminal voltage of generator is used to detecting and holds whether be in short-circuit condition mutually, thus judges whether to need closed protection control switch with positive closing field switch, thus will the short circuit current of generation be held mutually to control a lower scope.Detection threshold can adopt the voltage stabilizing didoe of a dimension, is connected to excitation end, and when excitation terminal voltage is higher than 8.2V, this voltage-stabiliser tube remains conducting state, and conducting voltage is 8.2V and whole phase terminal shortcircuit protective circuit operating voltage is 8.2V.And the effect of control switch positive closing unit to be the high potential produced when normally being worked by generator keep subsequent control switch---to use field effect transistor herein---that grid is in connected state over the ground always, control switch remains open state, therefore can not have an impact to the excitation of whole generator, but when excitation terminal voltage drops to below 8.2V in short-term, voltage stabilizing didoe for detecting voltage cannot keep on-state, when namely there is short circuit, the high potential input that alternator system cannot provide retentive control switch positive closing unit to close, now the grid of control switch is by a power supply unit, and---using the electric capacity of dimension herein---is in energy storage state when generator normally works always, the grid high potential that can be provided as the field effect transistor conducting that control switch uses is provided when short circuit occurs, therefore the conducting due to the conducting of control switch of the diode between control switch and field switch, field switch is forced to disconnect, thus protection alternator system.
The invention provides the phase terminal shortcircuit guard method of ground alternating current generator, be that the phase terminal shortcircuit protective circuit be arranged in parallel with excitation control circuit by is protected alternating current generator, in conjunction with consulting Fig. 3, the guard method of phase terminal shortcircuit comprises the steps:
S100, the voltage detecting alternating current generator excitation end, whether higher than a predetermined voltage, if so, then carries out step S200, if not, then carry out step S300;
S200, control switch positive closing unit disconnects the control switch be connected with described field switch, to make it to field switch without control;
S300, the control switch that the conducting of switch power supply unit is connected with described field switch, disconnects to make described excitation control circuit.
In above-mentioned steps S100, comprise excitation terminal voltage detecting S101 and judge that whether excitation terminal voltage is higher than a predetermined voltage (as 8.2V) S102.
In above-mentioned steps S200, comprise control switch positive closing unit and close conducting S301, switch power supply unit cannot provide high potential S202, and control switch unlatching S203 and field switch action are without affecting S204.
In above-mentioned steps S300, comprise control switch positive closing unit attonity S301, switch power supply unit starts the S302 that powers, and control switch closes conducting S303 and field switch disconnects S304.
Certainly; the present invention also can have other various embodiments; when not deviating from the present invention's spirit and essence thereof; those of ordinary skill in the art are when making various corresponding change and distortion according to the present invention, but these change accordingly and are out of shape the protection range that all should belong to the claim appended by the present invention.
Claims (12)
1. a phase terminal shortcircuit protective circuit; be connected with an alternating current generator; described alternating current generator has excitation control circuit and field switch; it is characterized in that; described phase terminal shortcircuit protective circuit and described excitation control circuit are arranged in parallel; and described phase terminal shortcircuit protective circuit and the input of described excitation control circuit are all connected the excitation end of alternating current generator, output all connects described field switch, described phase terminal shortcircuit protective circuit comprises:
Whether voltage detection unit, for detecting the voltage of described excitation end higher than a predetermined voltage;
Control switch, disconnects described field switch when conducting;
Control switch positive closing unit, in the voltage of excitation end higher than disconnecting described control switch during described predetermined voltage; And
Switch power supply unit, in the voltage of excitation end lower than control switch described in conducting during described predetermined voltage.
2. phase terminal shortcircuit protective circuit according to claim 1; it is characterized in that; described alternating current generator has voltage modulator circuit; described phase terminal shortcircuit protective circuit is embedded in described voltage modulator circuit; or described phase terminal shortcircuit protective circuit is arranged on outside described voltage modulator circuit.
3. phase terminal shortcircuit protective circuit according to claim 1, is characterized in that, described phase terminal shortcircuit protective circuit is arranged at the inner part as generator control loop of described alternating current generator.
4. according to the phase terminal shortcircuit protective circuit in claim 1-3 described in any one, it is characterized in that, described voltage detection unit is voltage stabilizing didoe.
5. according to the phase terminal shortcircuit protective circuit in claim 1-3 described in any one, it is characterized in that, described control switch is triode, field effect transistor or Darlington transistor.
6. according to the phase terminal shortcircuit protective circuit in claim 1-3 described in any one, it is characterized in that, described switch power supply unit is storage capacitor.
7. an alternating current generator; there is excitation control circuit and field switch; it is characterized in that; also there is a phase terminal shortcircuit protective circuit; described phase terminal shortcircuit protective circuit and described excitation control circuit are arranged in parallel; and described phase terminal shortcircuit protective circuit and the input of described excitation control circuit are all connected the excitation end of alternating current generator, output all connects described field switch, described phase terminal shortcircuit protective circuit comprises:
Whether voltage detection unit, for detecting the voltage of described excitation end higher than a predetermined voltage;
Control switch, disconnects described field switch when conducting;
Control switch positive closing unit, in the voltage of excitation end higher than disconnecting described control switch during described predetermined voltage; And
Switch power supply unit, in the voltage of excitation end lower than control switch described in conducting during described predetermined voltage.
8. alternating current generator according to claim 7; it is characterized in that also having voltage modulator circuit, described phase terminal shortcircuit protective circuit is embedded in described voltage modulator circuit; or described phase terminal shortcircuit protective circuit is arranged on outside described voltage modulator circuit.
9. alternating current generator according to claim 7, is characterized in that, described phase terminal shortcircuit protective circuit is arranged at the inner part as generator control loop of described alternating current generator.
10. according to the alternating current generator in claim 7-9 described in any one, it is characterized in that, described control switch is triode, field effect transistor or Darlington transistor.
11., according to the alternating current generator in claim 7-9 described in any one, is characterized in that, described switch power supply unit is storage capacitor.
The phase terminal shortcircuit guard method of 12. 1 kinds of alternating current generators; described alternating current generator has excitation control circuit and field switch; it is characterized in that, the phase terminal shortcircuit protective circuit be arranged in parallel with described excitation control circuit by is protected alternating current generator, comprises the steps:
S100, the voltage detecting alternating current generator excitation end, whether higher than a predetermined voltage, if so, then carries out step S200, if not, then carry out step S300;
S200, control switch positive closing unit disconnects the control switch be connected with described field switch, to make it to field switch without control;
S300, the control switch that the conducting of switch power supply unit is connected with described field switch, disconnects to make described excitation control circuit.
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 |
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| Publication Number | Publication Date |
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| CN104810797A true CN104810797A (en) | 2015-07-29 |
| CN104810797B CN104810797B (en) | 2018-07-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410031734.6A Active CN104810797B (en) | 2014-01-23 | 2014-01-23 | Phase terminal shortcircuit protects circuit and alternating current generator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110829914A (en) * | 2019-11-08 | 2020-02-21 | 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 |
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| 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 |
| CN101060255A (en) * | 2006-04-21 | 2007-10-24 | 株式会社电装 | Vehicle-use power generation control apparatus |
| 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 |
| 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 |
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2014
- 2014-01-23 CN CN201410031734.6A patent/CN104810797B/en active Active
Patent Citations (6)
| 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 |
| CN101060255A (en) * | 2006-04-21 | 2007-10-24 | 株式会社电装 | Vehicle-use power generation control apparatus |
| 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 |
| 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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110829914A (en) * | 2019-11-08 | 2020-02-21 | 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 |
| 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 |
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| CN104810797B (en) | 2018-07-06 |
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