CN105322930A - Short-time power down retaining circuit for direct-current solid-state power controller - Google Patents
Short-time power down retaining circuit for direct-current solid-state power controller Download PDFInfo
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- CN105322930A CN105322930A CN201510875956.0A CN201510875956A CN105322930A CN 105322930 A CN105322930 A CN 105322930A CN 201510875956 A CN201510875956 A CN 201510875956A CN 105322930 A CN105322930 A CN 105322930A
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Abstract
The invention relates to a short-time power down retaining circuit for a direct-current solid-state power controller. The short-time power down retaining circuit is used for performing power down retaining of direct-current distribution equipment of an airplane and comprises an RC short-time power down retaining circuit, and a power MOSFET driving circuit. Under the condition of power down, the driving voltage of a gate of the power MOSFET still can be retained at a certain voltage level during power down under the action of the RC short-time power down retaining circuit; and when power is restored, the voltage conducts the driving power MOSFET immediately. Therefore, the short-time power down retaining circuit can ensure that load in an open channel before power is turned off can be immediately conducted after the power is restored.
Description
Technical field
The present invention relates to aircraft field of power distribution, particularly a kind of short time power down holding 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.The situation that short time power down occurs in the normal operation circumstances of DC solid-state power controller is inevitable.When there is short time power down, DC solid-state power controller is because power down can automatically shut down aircraft DC for electric loading.After restoring electricity, need to wait for that dsp control signal end sends conductivity control signal, the just meeting conducting of the power MOSFET in power MOSFET driving circuit, and then again open aircraft DC for electric loading.Above-mentioned working method system is the most conventional at present, generally accept by technical staff and approve, how to reduce in the process of power-interrupt time in research, there is technical prejudice in technical staff, as one man study in the link restored electricity, and have ignored power MOSFET described in conducting is improved, cause this technology to be in the stage of stagnation for a long time.And applicant finds, above-mentioned working method also additionally can increase the time making power MOSFET ON on the basis of the time cycle of short time power down, increases the power-interrupt time of flight sequencing, affects distribution effect.If the circuit structure of power MOSFET can be improved, power-interrupt time can be shortened simply and effectively.
Summary of the invention
The object of the invention is the problem solving airborne DC distribution equipment short time power down, a kind of short time power down holding 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 short time power down holding circuit for DC solid-state power controller, for the short time power down maintenance work of aircraft DC controller switching equipment, includes,
RC short time power down holding circuit, it has the first electric capacity and the first resistance; And,
Power MOSFET driving circuit, it has the second resistance and the first power MOSFET;
There is the situation of power down, under described first electric capacity in described RC short time power down holding circuit and the acting in conjunction of described first resistance, make the gate drive voltage of described first power MOSFET in described power MOSFET driving circuit can maintain certain voltage levvl during power down, if after this restore electricity, described first power MOSFET can conducting rapidly, the object opened immediately for electric loading with the aircraft DC being in opening state before reaching power down.
As a kind of preferred version of the short time power down holding circuit for DC solid-state power controller, described power MOSFET driving circuit also includes the first voltage end and the second voltage end, wherein, described first voltage end connects the first end of described first electric capacity respectively, the first end of described first resistance and the first end of described second resistance, second end of described first electric capacity, second end of described first resistance and the equal earth terminal of source terminal of described first power MOSFET, the gate terminal of the first power MOSFET described in second termination of described second resistance, second voltage end described in the drain electrode termination of described first power MOSFET, again, the driving voltage of the first power MOSFET described in described first voltage end system, the operating voltage of DC solid-state power controller described in described second voltage end system.
As a kind of preferred version of the short time power down holding circuit for DC solid-state power controller, described power MOSFET driving circuit includes dsp control signal end and isolated drive circuit further, described dsp control signal end is in order to provide conductivity control signal, and described isolated drive circuit provides driving voltage according to described conductivity control signal to described first voltage end.
Compared with prior art, the present invention at least has the following advantages: 1. circuit realiration is simple, and volume is little, and cost is low, effectively can keep function by realizing circuit short supply interruption by rational match parameter.2. apply in a flexible way, by the circuit selecting different capacitance resistance parameters to realize the maintenance of different short time power down.3. shorten the power-interrupt time of flight sequencing.
Accompanying drawing explanation
Fig. 1 is circuit structure diagram of the present invention.
Fig. 2 is the circuit structure diagram of the RC short time power down holding circuit part in Fig. 1.
Fig. 3 is the circuit structure diagram of the power MOSFET driving circuit part in Fig. 1.
Fig. 4 is RC short time power down holding circuit waveform.
Embodiment
Below in conjunction with drawings and Examples, the present invention is elaborated.
Refer to Fig. 1, shown in figure is a kind of short time power down holding circuit for DC solid-state power controller, for the short time power down maintenance work of airborne controller switching equipment, primarily of a RC short supply interruption holding circuit and power MOSFET driving circuit composition.In the event of a power failure, under the effect of short time power down holding circuit, during DC solid-state power controller short time power down, the gate drive voltage of power MOSFET still maintains certain voltage levvl, after restoring electricity, this voltage enough makes power MOSFET conducting immediately, power MOSFET just conducting when need not wait until that DSP sends conductivity control signal, so can guarantee that DC solid-state power controller is in the channel load opened before power down can be open-minded immediately after restoring electricity.
Refer to Fig. 2, described RC short supply interruption holding circuit, comprises,
The first end of described first electric capacity C1 is connected with the first voltage end Vp, second end of the first electric capacity C1 is connected with the first earth terminal GND, the first end of described first resistance R1 is connected with the first voltage end Vp, second end of the first resistance R1 is connected with the first earth terminal GND, described first voltage end Vp is the voltage that control signal that DSP sends exports through isolation drive module, and this voltage Vp is used for driving power MOSFETQ1.
As shown in Figure 2, the base components of RC short time power down holding circuit is an electric capacity, and general principle is exactly capacitor charge and discharge principle.When dsp control signal is high level, export a power MOSFET gate drive voltage by isolated drive circuit, now the first electric capacity C1 is charged; When there is the situation of short time power down, dsp control signal end does not have signal to export, at this moment the first electric capacity C1 is discharged by the first resistance R1, although short time power down during this period of time in voltage on the first electric capacity C1 and power MOSFET Q1 gate drive voltage Vp reduce gradually, as long as but reasonably coupling arranges the parameter of the first electric capacity C1 and the first resistance R1, just can guarantee the enough driving power MOSFETQ1 of voltage after service restoration on the first electric capacity C1.When there is short time power down, the first electric capacity C1 is discharged by the first resistance R1, and electric discharge formula is:
In formula, Ut is the voltage after the t time of electric capacity two ends, and E is the initial voltage at electric capacity two ends, and R is the resistance of the first resistance R1, and C is the capacitance of the first electric capacity C1, and t is the time of short time power down.With the first resistance R1 for 470k, first electric capacity C1 is 47uF, short time power down time t is 200ms is example, its RC short time power down holding circuit waveform is shown in Figure 4, wavy curve is below the oscillogram of dsp control signal, and wavy curve is above voltage waveform on the first electric capacity C1 and power MOSFET Q1 gate drive voltage wavy curve.
Refer to Fig. 3, described power MOSFET driving circuit, comprises,
Described DSP sends control signal and exports a driving voltage Vp by isolated drive circuit, this driving voltage Vp is used for driving power MOSFETQ1, the first end of described second resistance R2 is connected with the first voltage end Vp, second end of described second resistance R2 is connected with the gate terminal of one first power MOSFET Q1, the gate terminal of described first power MOSFET Q1 is connected with second end of one second resistance R2, the drain electrode end of described power MOSFET Q1 is connected with one second voltage end D28V, the source terminal of described power MOSFET Q1 is connected with one first earth terminal GND, described second voltage end D28V is the operating voltage of DC solid-state power controller.Described second resistance R2 is for buffered power MOSFETQ1 grid impulse voltage.
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 (3)
1., for a short time power down holding circuit for DC solid-state power controller, for the short time power down maintenance work of aircraft DC controller switching equipment, it is characterized in that, include,
RC short time power down holding circuit, it has the first electric capacity and the first resistance; And,
Power MOSFET driving circuit, it has the first power MOSFET, preferably, also has the second resistance;
There is the situation of power down, under described first electric capacity in described RC short time power down holding circuit and the acting in conjunction of described first resistance, make the gate drive voltage of described first power MOSFET in described power MOSFET driving circuit can maintain certain voltage levvl during power down, if after this restore electricity, described first power MOSFET can conducting rapidly, the object opened immediately for electric loading with the aircraft DC being in opening state before reaching power down.
2. a kind of short time power down holding circuit for DC solid-state power controller according to claim 1, it is characterized in that, described power MOSFET driving circuit also includes the first voltage end and the second voltage end, wherein, described first voltage end connects the first end of described first electric capacity respectively, the first end of described first resistance and the first end of described second resistance, second end of described first electric capacity, second end of described first resistance and the equal earth terminal of source terminal of described first power MOSFET, the gate terminal of the first power MOSFET described in second termination of described second resistance, second voltage end described in the drain electrode termination of described first power MOSFET, again, the driving voltage of the first power MOSFET described in described first voltage end system, the operating voltage of DC solid-state power controller described in described second voltage end system.
3. a kind of short time power down holding circuit for DC solid-state power controller according to claim 2, it is characterized in that, described power MOSFET driving circuit includes dsp control signal end and isolated drive circuit further, described dsp control signal end is in order to provide conductivity control signal, and described isolated drive circuit provides driving voltage according to described conductivity control signal to described first voltage end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510875956.0A CN105322930A (en) | 2015-12-02 | 2015-12-02 | Short-time power down retaining circuit for direct-current solid-state power controller |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510875956.0A CN105322930A (en) | 2015-12-02 | 2015-12-02 | Short-time power down retaining circuit for direct-current solid-state power controller |
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| CN105322930A true CN105322930A (en) | 2016-02-10 |
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| CN201510875956.0A Pending CN105322930A (en) | 2015-12-02 | 2015-12-02 | Short-time power down retaining circuit for direct-current solid-state power controller |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09266439A (en) * | 1996-03-28 | 1997-10-07 | Kokusan Denki Co Ltd | Time-limit circuit |
| US5881251A (en) * | 1996-10-10 | 1999-03-09 | Bay Networks, Inc. | Hot swap control circuit |
| CN202633902U (en) * | 2012-06-21 | 2012-12-26 | 四川长虹欣锐科技有限公司 | Power failure protecting circuit for television set |
| CN103297017A (en) * | 2013-06-05 | 2013-09-11 | 江苏德厚机电有限公司 | Simple direct-current light-operated delay control circuit |
| CN204578815U (en) * | 2015-02-06 | 2015-08-19 | 法雷奥汽车内部控制（深圳）有限公司 | Power down memory circuit |
-
2015
- 2015-12-02 CN CN201510875956.0A patent/CN105322930A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09266439A (en) * | 1996-03-28 | 1997-10-07 | Kokusan Denki Co Ltd | Time-limit circuit |
| US5881251A (en) * | 1996-10-10 | 1999-03-09 | Bay Networks, Inc. | Hot swap control circuit |
| CN202633902U (en) * | 2012-06-21 | 2012-12-26 | 四川长虹欣锐科技有限公司 | Power failure protecting circuit for television set |
| CN103297017A (en) * | 2013-06-05 | 2013-09-11 | 江苏德厚机电有限公司 | Simple direct-current light-operated delay control circuit |
| CN204578815U (en) * | 2015-02-06 | 2015-08-19 | 法雷奥汽车内部控制（深圳）有限公司 | Power down memory circuit |
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Application publication date: 20160210 |