CN102832870A - Chopper circuit for power generator exciting current - Google Patents
Chopper circuit for power generator exciting current Download PDFInfo
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- CN102832870A CN102832870A CN2012103109505A CN201210310950A CN102832870A CN 102832870 A CN102832870 A CN 102832870A CN 2012103109505 A CN2012103109505 A CN 2012103109505A CN 201210310950 A CN201210310950 A CN 201210310950A CN 102832870 A CN102832870 A CN 102832870A
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Abstract
The invention belongs to the design technology of power generator controllers and relates to an improvement of a chopper circuit for power generator exciting current. The chopper circuit comprises a driving chip N1, a resistor R1, a resistor R3, a resistor R4, a field-effect tube V1, a capacitor C1 and a diode D2; the chopper circuit is characterized by also comprising a second series branch consisting of a diode D1 and a resistor R2 which are connected in series, the negative electrode of the diode D1 is connected with the output end of the driving chip N1, and the other end of the resistor R2 is connected with the grid electrode G of the field-effect tube. According to the chopper circuit, the switching-off process of the field-effect tube V1 is accelerated, the switching-off time is reduced, so that the loss of the field-effect tube V1 is reduced.
Description
Technical field
The invention belongs to the engine controller designing technique, relate to improvement the exciter current of generator chopper circuit.
Background technology
The service aircraft power-supply system is made up of generator and controller basically, and controller is realized functions such as generator output voltage pressure regulation and protection.When load variations, controller is kept generator output voltage through regulator generator exciting current size and is kept constant.The adjusting exciting current is through the conducting of switching tube in the chopping signal driving exciting current loop and turn-offs and realize.The structure of present a kind of exciter current of generator chopper circuit is referring to Fig. 1, and it is made up of chip for driving N1, resistance R 1, R3 and R4, FET V1, capacitor C 1 and diode D2; Diode D2 is connected in parallel on the two ends of generator excitation winding L; The negative pole of diode D2 is connected with field power supply; The pulse-width signal input of chip for driving N1 is connected with the pulse-width signal output PWM of regulating circuit, and the power input of chip for driving N1 is connected, is connected with the grid G of FET V1 behind the output series resistance R1 of chip for driving N1 with+15V power supply; Resistance R 3 is connected between the grid G and drain electrode S of FET V1; The drain electrode S ground connection of FET V1, the source electrode D of FET V1 is connected with the positive pole of diode D2, and capacitor C 1 is formed a series arm with resistance R 4; One end ground connection of this series arm, the other end is connected with the source electrode D of FET V1.Its operation principle is: pwm signal drives FET V1 through current-limiting resistance R1 after carrying out electrical isolation and power amplification through chip for driving N1, the time of resistance R 1 decision FET V1 conducting and turn off process; When FET V1 turn-offed, diode D2 carried out afterflow to exciting current, and capacitor C 1 absorbs the pulse spike that FET V1 shutdown moment produces at FET V1 source electrode D with resistance R 4.Its shortcoming is: because of the resistance limits of resistance R 1, FET V1 turn off process is slow, and the turn-off time is long, causes the loss of FET V1 big.
Summary of the invention
The objective of the invention is: propose a kind of exciter current of generator chopper circuit that can quicken turn off process, shorten the turn-off time, to reduce the loss of field effect transistor switch pipe V1.
Technical scheme of the present invention is: the exciter current of generator chopper circuit comprises chip for driving N1, resistance R 1, R3 and R4, FET V1, capacitor C 1 and diode D2; Diode D2 is connected in parallel on the two ends of generator excitation winding L; The negative pole of diode D2 is connected with field power supply; The pulse-width signal input of chip for driving N1 is connected with the pulse-width signal output PWM of regulating circuit, and the power input of chip for driving N1 is connected, is connected with the grid G of FET V1 behind the output series resistance R1 of chip for driving N1 with+15V power supply; Resistance R 3 is connected between the grid G and drain electrode S of FET V1; The drain electrode S ground connection of FET V1, the source electrode D of FET V1 is connected with the positive pole of diode D2, and capacitor C 1 is formed a series arm with resistance R 4; One end ground connection of this series arm, the other end is connected with the source electrode D of FET V1; It is characterized in that: second series arm that is composed in series by diode D1 and resistance R 2 is arranged; The positive pole of diode D1 is connected with an end of resistance R 2; The negative pole of diode D1 is connected with the output of chip for driving N1, and the other end of resistance R 2 is connected with the grid G of FET V1.
Advantage of the present invention is: quickened the turn off process of field effect transistor switch pipe V1, shortened the turn-off time, thereby reduced the loss of field effect transistor switch pipe V1.
Description of drawings
Fig. 1 is the structure principle chart of present a kind of exciter current of generator chopper circuit.
Fig. 2 is a structure principle chart of the present invention.
Embodiment
Explain further details in the face of the present invention down.Referring to Fig. 2, the exciter current of generator chopper circuit comprises chip for driving N1, resistance R 1, R3 and R4, FET V1, capacitor C 1 and diode D2; Diode D2 is connected in parallel on the two ends of generator excitation winding L; The negative pole of diode D2 is connected with field power supply; The pulse-width signal input of chip for driving N1 is connected with the pulse-width signal output PWM of regulating circuit, and the power input of chip for driving N1 is connected, is connected with the grid G of FET V1 behind the output series resistance R1 of chip for driving N1 with+15V power supply; Resistance R 3 is connected between the grid G and drain electrode S of FET V1; The drain electrode S ground connection of FET V1, the source electrode D of FET V1 is connected with the positive pole of diode D2, and capacitor C 1 is formed a series arm with resistance R 4; One end ground connection of this series arm, the other end is connected with the source electrode D of FET V1; It is characterized in that: second series arm that is composed in series by diode D1 and resistance R 2 is arranged; The positive pole of diode D1 is connected with an end of resistance R 2; The negative pole of diode D1 is connected with the output of chip for driving N1, and the other end of resistance R 2 is connected with the grid G of FET V1.
The resistance of said resistance R 2 is identical with resistance R 1, and said diode D1 is a fast recovery diode.
Operation principle of the present invention is: pwm signal is behind chip for driving N1, and through the drive circuit that R1, R2, R3, D1 form, driven MOS pipe V1, R4, C1 are the absorption circuit of V1, and L is an excitation winding, and D2 is a fly-wheel diode.The output output 15V of N1 is behind R1, R3, and the VGS of input V1 holds the V1 conducting.The output of N1 is 0, and the G of V1 end is dragged down, and V1 turn-offs.FET pipe V1 opens/turn-off time:
t＝R
G×C
ISS＝R
G×(C
GS+C
gd1)
In the formula, R
GBe V1 gate driving resistance, C
GSBe V1 grid source parasitic capacitance, C
Gd1Be V1 Muller electric capacity (relevant) with the DS voltage/current.
Embodiment 1, and R1, R2 resistance are 20 Ω, and the R3 resistance is 5.1K Ω, and the D1 model is 2CN3F, and the V1 model is IXKK85N60C, and DS voltage was 150V when FET pipe V1 turn-offed, and the V1 average current is 20A.The FET pipe turn-off time is reduced to 55ns by 100ns.
Embodiment 2:R1, R2 resistance are 100 Ω, and the R3 resistance is 5.1K Ω, and the D1 model is 2CN3F, and the V1 model is IRF460, and DS voltage was 110V when FET pipe V1 turn-offed, and the V1 average current is 5A.The FET pipe turn-off time is reduced to 30ns by 51ns.
Claims (2)
1. the exciter current of generator chopper circuit comprises chip for driving N1, resistance R 1, R3 and R4, FET V1, capacitor C 1 and diode D2; Diode D2 is connected in parallel on the two ends of generator excitation winding L; The negative pole of diode D2 is connected with field power supply; The pulse-width signal input of chip for driving N1 is connected with the pulse-width signal output PWM of regulating circuit, and the power input of chip for driving N1 is connected, is connected with the grid G of FET V1 behind the output series resistance R1 of chip for driving N1 with+15V power supply; Resistance R 3 is connected between the grid G and drain electrode S of FET V1; The drain electrode S ground connection of FET V1, the source electrode D of FET V1 is connected with the positive pole of diode D2, and capacitor C 1 is formed a series arm with resistance R 4; One end ground connection of this series arm, the other end is connected with the source electrode D of FET V1; It is characterized in that: second series arm that is composed in series by diode D1 and resistance R 2 is arranged; The positive pole of diode D1 is connected with an end of resistance R 2; The negative pole of diode D1 is connected with the output of chip for driving N1, and the other end of resistance R 2 is connected with the grid G of FET V1.
2. exciter current of generator chopper circuit according to claim 1 is characterized in that: the resistance of said resistance R 2 is identical with resistance R 1, and said diode D1 is a fast recovery diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103109505A CN102832870A (en) | 2012-08-28 | 2012-08-28 | Chopper circuit for power generator exciting current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103109505A CN102832870A (en) | 2012-08-28 | 2012-08-28 | Chopper circuit for power generator exciting current |
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| CN102832870A true CN102832870A (en) | 2012-12-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012103109505A Pending CN102832870A (en) | 2012-08-28 | 2012-08-28 | Chopper circuit for power generator exciting current |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103607122A (en) * | 2013-11-27 | 2014-02-26 | 西安合电电气有限公司 | Harmonic voltage stabilization control system |
| CN104270051A (en) * | 2014-10-08 | 2015-01-07 | 北京曙光航空电气有限责任公司 | Brushless direct-current generator excitation circuit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4933623A (en) * | 1988-12-29 | 1990-06-12 | Westinghouse Electric Corp. | Generator voltage regulator power circuit |
| CN200976577Y (en) * | 2006-11-29 | 2007-11-14 | 青岛海信电器股份有限公司 | MOS tube driving circuit and television set having the same |
| CN201503817U (en) * | 2009-07-07 | 2010-06-09 | 厦门士林电机有限公司 | Improved control loop of electronic contactor |
| CN102624220A (en) * | 2011-01-28 | 2012-08-01 | 松下电器产业株式会社 | Switching power circuit, and lighting device for semiconductor light-emitting element and illumination apparatus using same |
-
2012
- 2012-08-28 CN CN2012103109505A patent/CN102832870A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4933623A (en) * | 1988-12-29 | 1990-06-12 | Westinghouse Electric Corp. | Generator voltage regulator power circuit |
| CN200976577Y (en) * | 2006-11-29 | 2007-11-14 | 青岛海信电器股份有限公司 | MOS tube driving circuit and television set having the same |
| CN201503817U (en) * | 2009-07-07 | 2010-06-09 | 厦门士林电机有限公司 | Improved control loop of electronic contactor |
| CN102624220A (en) * | 2011-01-28 | 2012-08-01 | 松下电器产业株式会社 | Switching power circuit, and lighting device for semiconductor light-emitting element and illumination apparatus using same |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103607122A (en) * | 2013-11-27 | 2014-02-26 | 西安合电电气有限公司 | Harmonic voltage stabilization control system |
| CN104270051A (en) * | 2014-10-08 | 2015-01-07 | 北京曙光航空电气有限责任公司 | Brushless direct-current generator excitation circuit |
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Application publication date: 20121219 |