CN105356425A - Over-current turn-off circuit for direct-current solid-state power controller - Google Patents
Over-current turn-off circuit for direct-current solid-state power controller Download PDFInfo
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- CN105356425A CN105356425A CN201510871560.9A CN201510871560A CN105356425A CN 105356425 A CN105356425 A CN 105356425A CN 201510871560 A CN201510871560 A CN 201510871560A CN 105356425 A CN105356425 A CN 105356425A
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- resistance
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- triode
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications
Abstract
The invention relates to an over-current turn-off circuit for a direct-current solid-state power controller, which is used for over-current protection of direct-current distribution equipment of an airplane. The over-current turn-off circuit comprises a triode over-current protection circuit and a current control turn-off circuit, wherein the current control turn-off circuit is provided with a power MOSFET (Metal Oxide Semiconductor Field Effect Transistor); if the current magnitude of an input current signal is beyond an over-current protection set value, the triode over-current protection circuit immediately limits the input current signal within the range of the set value and the current control turn-off circuit turns off the power MOSFET. The over-current turn-off circuit has the advantages: 1, the triode over-current protection circuit has quick response, and can effectively realize the over-current protection function of the direct-current solid-state power controller; and 2, in the normal working state of the direct-current solid-state power controller, the triode over-current protection circuit is cut off, so the leak current is low, and the loss of the circuit is reduced.
Description
Technical field
The present invention relates to aircraft field of power distribution, particularly a kind of overcurrent turn-off function circuit for DC solid-state power controller.
Background technology
In aircraft DC distribution system, be that the solid state distribution technology of representative is progressively developing with DC solid-state power controller, because in the operational environment of DC solid-state power controller, overcurrent condition is inevitable, overcurrent comprises overload and short circuit, and short circuit wants large relative to harmfulness of over-load.The short-circuit conditions in overcurrent is referred to, because the destructiveness of short circuit is larger, so short circuit is realized by hardware usually, can protect immediately for the overcurrent in the overcurrent turn-off function circuit of DC solid-state power controller.We know that triode belongs to current-control type element circuit shown in Figure 1, and when base current ib is 0, transistor collector current i c is 0, and triode ends, and are equivalent to switch and disconnect; When the increase of base current ib, when collector current ic can not be made to continue to increase, triode just enters saturation condition, the criterion of general judgement saturation condition is ib* β >ic, after triode enters saturation condition, the collector electrode c of triode is very little with the pressure reduction between emitter e, is equivalent to switch and closes.The switching characteristic of triode is utilized the collector electrode of triode and the grid of power MOSFET to be connected together, triode in saturation condition time, immediately the grid voltage of power MOSFET can be dragged down, be limited in the scope of setting by power MOSFET input current, simultaneously controlling to match with DSP turns off power MOSFET.
Applicant finds through practice, and the current foldback circuit utilizing the switching characteristic of triode to form is applied in DC solid-state power controller, effectively can realize the overcurrent turn-off function function of DC solid-state power controller.
Summary of the invention
The object of the invention is the problem solving airborne DC distribution equipment circuit overcurrent, a kind of overcurrent turn-off function circuit for DC solid-state power controller provided.
To achieve these goals, technical scheme of the present invention is achieved in that a kind of overcurrent turn-off function circuit for DC solid-state power controller, for the overcurrent protection work of aircraft DC controller switching equipment, includes,
Triode current foldback circuit; And,
Current Control breaking circuit, has power MOSFET;
If when the size of current of input current signal exceedes overcurrent protection set point, by described Current Control breaking circuit, power MOSFET is turned off in the scope immediately this input current signal being limited in set point by described triode current foldback circuit.
As a kind of preferred version of the overcurrent turn-off function circuit for DC solid-state power controller, described Current Control breaking circuit includes gate driver circuit, first resistance, first power MOSFET, A/D change-over circuit, DSP control circuit and the second voltage end, described triode current foldback circuit includes the second resistance, 3rd resistance, 4th resistance, 5th resistance and the first triode, wherein, the driving voltage end of described gate driver circuit is connected with the first end of described first resistance, second end of described first resistance is connected with the gate terminal of described first power MOSFET and the collector electrode of described first triode respectively, the base stage of described first triode is connected with the first end of described second resistance and the first end of described 3rd resistance respectively, second end of described second resistance is connected with the first end of described 5th resistance and the source terminal of described first power MOSFET respectively, second end of described 5th resistance is connected with the second end of described 4th resistance, the emitter of described first triode, second end of described 3rd resistance and the first end of described 4th resistance all with the first earth terminal, the drain electrode end of described first power MOSFET is connected with described second voltage end, again, the voltage detecting end of described A/D change-over circuit is connected with the first end of described 5th resistance and the second end respectively, described A/D change-over circuit is in order to sense the magnitude of voltage of described 5th resistance, the signal output part of described A/D change-over circuit is connected with the signal input part of described DSP control circuit, the signal output part of described DSP control circuit is connected with the signal input part of described gate driver circuit.
As a kind of preferred version of the overcurrent turn-off function circuit for DC solid-state power controller, the resistance of resistance much larger than described second resistance of described 3rd resistance and the resistance of described 4th resistance.
As a kind of preferred version of the overcurrent turn-off function circuit for DC solid-state power controller, described 5th resistance sampling resistance adopts high power superalloy low resistance Chip-R, described second earth terminal is corresponding with the second voltage end, and described second earth terminal and the first earth terminal are different earth terminals.
Compared with prior art, the present invention at least has the following advantages: 1. triode current foldback circuit fast response time, effectively can realize the overcurrent protection function of DC solid-state power controller.2. under DC solid-state power controller normal operating conditions, triode current foldback circuit is in cut-off state, and leakage current is very little, reduces circuit loss.
Accompanying drawing explanation
Fig. 1 is triode principle graphical diagram.
Fig. 2 is circuit structure of the present invention.
Fig. 3 is the circuit structure diagram of the triode current foldback circuit part in Fig. 2.
Fig. 4 is the circuit structure diagram of the Current Control breaking circuit part in Fig. 2.
Embodiment
Below in conjunction with drawings and Examples, the present invention is elaborated.
Refer to Fig. 2, shown in figure is a kind of overcurrent turn-off function circuit for DC solid-state power controller, for aircraft DC for the work of electric loading power distribution protection, primarily of a Current Control breaking circuit and triode current foldback circuit composition.Wherein, described Current Control breaking circuit includes gate driver circuit, the first resistance R1, first power MOSFET Q2, A/D change-over circuit, DSP control circuit and the second voltage end D28V.Described triode current foldback circuit includes the second resistance R2, the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5 and the first triode Q1.When connecting the working power of described first power MOSFET Q2 drain electrode end; and when gate driver circuit provides a driving voltage; a current signal can be exported; when this current signal exceedes overcurrent protection design load, by described Current Control breaking circuit, described first power MOSFET Q2 is turned off in the scope immediately this current signal being limited in set point by described triode current foldback circuit.
Refer to Fig. 3, described triode current foldback circuit, particularly, the base stage of described first triode Q1 is connected with the first end of described second resistance R2, the base stage of described first triode Q1 is connected with the first end of described 3rd resistance R3, second end of described 3rd resistance R3 is connected with the first earth terminal GND, second end of described 3rd resistance R3 is connected with the first end of described 4th resistance R4, the emitter of described first triode Q1 is connected with the first earth terminal GND, second end of described second resistance R2 is connected with the first end of described 5th resistance R5, second end of described 4th resistance R4 is connected with second end of described 5th resistance R5.Described triode current foldback circuit has fast response time, the feature that leakage current is little.Wherein, described 3rd resistance R3 resistance is much larger than described second resistance R2 resistance, described 4th resistance R4 resistance.When the electric current of described 5th resistance R5 exceedes overcurrent protection set point, described A/D change-over circuit collects the voltage at described 5th resistance R5 two ends, namely the voltage at described 3rd resistance R3 two ends is (because the 3rd resistance R3 resistance is much larger than the second resistance R2 resistance, 4th resistance R4 resistance) be greater than base stage and the launching base both end voltage Ube of described first triode Q1, base current ib* β > collector electrode ic simultaneously, described first triode Q1 enters saturation condition, the voltage U ce ≈ 0 of collector electrode and emitter, described first triode Q1 collector potential is dragged down, namely the grid voltage of described first power MOSFET Q2 is dragged down, this over-current signal is limited in the scope of set point.The effect of described second resistance R2, described 3rd resistance R3, described 4th resistance R4 has damaged triode when having prevented overvoltage signal.Wherein, described 5th resistance R5 system sampling resistor, adopt high power superalloy low resistance Chip-R, when operating current flows through sampling resistor, current signal is changed into voltage signal by described A/D change-over circuit, the size of this voltage signal is compared with emitter both end voltage value with described first triode Q1 base stage, judges whether triode is opened.
Refer to Fig. 4, described Current Control breaking circuit, particularly, the driving voltage Vp that described gate driver circuit exports is connected with the first end of described first resistance R1, second end of described first resistance R1 is connected with the gate terminal of described first power MOSFET Q2, the drain electrode end of described first power MOSFET Q2 is connected with described second voltage end D28V, the source electrode of described first power MOSFET Q2 is connected with the first end of described 5th resistance R5, the two ends of described 5th resistance R5 are connected with described A/D change-over circuit, described A/D convertor circuit is connected with described DSP control circuit, described DSP control circuit is connected with described gate driver circuit.When circuit generation electric current, described for collection the 5th resistance R5 two ends analog voltage signal is changed into digital signal simultaneously and delivers to described DSP control circuit by described A/D change-over circuit, an over current value (lower than above-mentioned set overcurrent value) can be set in described DSP control circuit, described DSP control circuit sends control signal and is dragged down by gate drive voltage, turns off described first power MOSFET.In addition, described second earth terminal D28V-GND is corresponding with the second voltage D28V, and described second earth terminal D28V-GND is different earth terminals from the first earth terminal GND, if the first earth terminal is corresponding with the second voltage D28V, can cause power supply short circuit.
Below only have expressed embodiments of the present invention, it describes comparatively concrete and detailed, but can not therefore be construed as limiting the scope of the patent.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (4)
1., for an overcurrent turn-off function circuit for DC solid-state power controller, for the overcurrent protection work of aircraft DC controller switching equipment, it is characterized in that, include,
Triode current foldback circuit; And,
Current Control breaking circuit, has power MOSFET;
If when the size of current of input current signal exceedes overcurrent protection set point, by described Current Control breaking circuit, power MOSFET is turned off in the scope immediately this input current signal being limited in set point by described triode current foldback circuit.
2. a kind of overcurrent turn-off function circuit for DC solid-state power controller according to claim 1, it is characterized in that, described Current Control breaking circuit includes gate driver circuit, first resistance, first power MOSFET, A/D change-over circuit, DSP control circuit and the second voltage end, described triode current foldback circuit includes the second resistance, 3rd resistance, 4th resistance, 5th resistance and the first triode, wherein, the driving voltage end of described gate driver circuit is connected with the first end of described first resistance, second end of described first resistance is connected with the gate terminal of described first power MOSFET and the collector electrode of described first triode respectively, the base stage of described first triode is connected with the first end of described second resistance and the first end of described 3rd resistance respectively, second end of described second resistance is connected with the first end of described 5th resistance and the source terminal of described first power MOSFET respectively, second end of described 5th resistance is connected with the second end of described 4th resistance, the emitter of described first triode, second end of described 3rd resistance and the first end of described 4th resistance all with the first earth terminal, the drain electrode end of described first power MOSFET is connected with described second voltage end, again, the voltage detecting end of described A/D change-over circuit is connected with the first end of described 5th resistance and the second end respectively, described A/D change-over circuit is in order to sense the magnitude of voltage of described 5th resistance, the signal output part of described A/D change-over circuit is connected with the signal input part of described DSP control circuit, the signal output part of described DSP control circuit is connected with the signal input part of described gate driver circuit.
3. a kind of overcurrent turn-off function circuit for DC solid-state power controller according to claim 2, is characterized in that, the resistance of resistance much larger than described second resistance of described 3rd resistance and the resistance of described 4th resistance.
4. a kind of overcurrent turn-off function circuit for DC solid-state power controller according to Claims 2 or 3, it is characterized in that, described 5th resistance sampling resistance adopts high power superalloy low resistance Chip-R, described second earth terminal is corresponding with the second voltage end, and described second earth terminal and the first earth terminal are different earth terminals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510871560.9A CN105356425A (en) | 2015-12-02 | 2015-12-02 | Over-current turn-off circuit for direct-current solid-state power controller |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510871560.9A CN105356425A (en) | 2015-12-02 | 2015-12-02 | Over-current turn-off circuit for direct-current solid-state power controller |
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| CN105356425A true CN105356425A (en) | 2016-02-24 |
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| CN201510871560.9A Pending CN105356425A (en) | 2015-12-02 | 2015-12-02 | Over-current turn-off circuit for direct-current solid-state power controller |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111670524A (en) * | 2018-02-05 | 2020-09-15 | 皮尔伯格泵技术有限责任公司 | Automatic auxiliary unit with electronic protection unit |
| CN111987686A (en) * | 2020-08-26 | 2020-11-24 | 天津津航计算技术研究所 | Configurable MOS tube current-limiting protection circuit |
| CN111987703A (en) * | 2020-08-26 | 2020-11-24 | 天津津航计算技术研究所 | MOS pipe current-limiting protection circuit among direct current circuit |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203445604U (en) * | 2013-05-03 | 2014-02-19 | Tcl空调器(中山)有限公司 | PFC (power factor correction) circuit and PFC frequency converter |
-
2015
- 2015-12-02 CN CN201510871560.9A patent/CN105356425A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203445604U (en) * | 2013-05-03 | 2014-02-19 | Tcl空调器(中山)有限公司 | PFC (power factor correction) circuit and PFC frequency converter |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111670524A (en) * | 2018-02-05 | 2020-09-15 | 皮尔伯格泵技术有限责任公司 | Automatic auxiliary unit with electronic protection unit |
| CN111670524B (en) * | 2018-02-05 | 2022-11-15 | 皮尔伯格泵技术有限责任公司 | Automatic auxiliary unit with electronic protection unit |
| CN111987686A (en) * | 2020-08-26 | 2020-11-24 | 天津津航计算技术研究所 | Configurable MOS tube current-limiting protection circuit |
| CN111987703A (en) * | 2020-08-26 | 2020-11-24 | 天津津航计算技术研究所 | MOS pipe current-limiting protection circuit among direct current circuit |
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Application publication date: 20160224 |
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