CN101800472A - Unipolar driving circuit - Google Patents
Unipolar driving circuit Download PDFInfo
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- CN101800472A CN101800472A CN201010102508A CN201010102508A CN101800472A CN 101800472 A CN101800472 A CN 101800472A CN 201010102508 A CN201010102508 A CN 201010102508A CN 201010102508 A CN201010102508 A CN 201010102508A CN 101800472 A CN101800472 A CN 101800472A
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- power switching
- switching tube
- driving circuit
- follow current
- power switch
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Abstract
The invention discloses a unipolar driving circuit, which is characterized by comprising a direct-current power supply, four power switching tubes and four follow current diodes, wherein a positive electrode of the direct-current power supply is connected with drain electrodes of a first power switching tube and a third power switching tube and cathodes of a first follow current diode and a third follow current diode respectively; a negative electrode of the direct-current power supply is connected with source electrodes of a second power switching tube and a fourth power switching tube and anodes of a second follow current diode and a fourth follow current diode respectively; the first power switching tube is connected with a drain electrode of the second power switching tube, an anode of the first follow current diode and a cathode of the second follow current diode respectively and is used as an output end of the driving circuit; and the third power switching tube is connected with a drain electrode of the fourth power switching tube, an anode of the third follow current diode and a cathode of the fourth follow current diode respectively and is used as an input end of the driving circuit. In the unipolar driving circuit, the polar modulation is realized by a double-edge-driving mode, and the unipolar driving circuit has the advantages of simple structure, high efficiency and reliable pulse data transmission.
Description
Technical field
Invent the Unipolar driving circuit that relates to inductive loads such as a kind of drive motors.
Background technology
Traditional unipolarity modulation divides the high and low frequency arm, and (G1 and G2 are that low frequency drives, such as when being output as 50Hz, G1, G2 is each conducting 10ms, G3, G4 copped wave under relative high frequency), bilateral driving pulse along type PWM structure produces the angle that needs to calculate zero crossing and comes, its switching angle must change with sinusoidal rule by the output voltage pulsewidth, so calculation of complex.
Summary of the invention
The present invention seeks to provides a kind of Unipolar driving circuit at the defective that prior art exists.
The present invention adopts following technical scheme for achieving the above object:
The present invention is a kind of Unipolar driving circuit, it is characterized in that comprising DC power supply, four power switch pipes and four fly-wheel diodes, wherein the positive pole of DC power supply connects the drain electrode of the first and the 3rd power switch pipe and the negative electrode of the first and the 3rd fly-wheel diode respectively, the negative pole of DC power supply connects the source electrode of the second and the 4th power switch pipe and the anode of the second and the 4th fly-wheel diode respectively, first power switch pipe connects the drain electrode of second power switch pipe respectively, the negative electrode of the anode of first fly-wheel diode and second fly-wheel diode and as the output of described drive circuit, the 3rd power switch pipe connects the drain electrode of the 4th power switch pipe respectively, the negative electrode of the anode of the 3rd fly-wheel diode and the 4th fly-wheel diode and as the input of described drive circuit.
Power IGBT is in afterflow in time having under the inductive load situations such as translator greatly in the present invention, if four IGBT are conducting and Homogeneouslly-radiating on average, each IGBT on installation and the heat-pipe radiator will evenly generate heat so, can not cause the uneven problem of local pyrexia.
Description of drawings
Fig. 1: circuit theory diagrams of the present invention.
Fig. 2: switching sequence and negative half period afterflow administrative division map.
Fig. 3: (a) drive the demodulation sequential, (b) bilateral along driving the generation circuit sequence.
Embodiment
Be elaborated below in conjunction with the technical scheme of accompanying drawing to invention:
As shown in Figure 1, a kind of Unipolar driving circuit, it is characterized in that comprising DC power supply DC, four power switch pipe G1～G4 and four sustained diode 1～D4, wherein the positive pole of DC power supply DC meets the first and the 3rd power switch pipe (G1 respectively, G3) drain electrode and the first and the 3rd sustained diode 1, the negative electrode of D3, the negative pole of DC power supply DC meets the second and the 4th power switch pipe G2 respectively, the source electrode of G4 and the second and the 4th sustained diode 2, the anode of D4, the first power switch pipe G1 connects the drain electrode of the second power switch pipe G2 respectively, the negative electrode of the anode of first sustained diode 1 and second sustained diode 2 and as the output of described drive circuit, the 3rd power switch pipe G3 connects the drain electrode of the 4th power switch pipe G4 respectively, the negative electrode of the anode of the 3rd sustained diode 3 and the 4th sustained diode 4 and as the input of described drive circuit.
Power cell uses the unipolar driving sequential of full-bridge, driving branch with respect to traditional unipolarity mode has high frequency arm and low band arm, employed driving is with driving pulse frequently in this unit, and by expanding duty ratio and the positive and negative sequential that pulse duty factor is regulated output, therefore this driving sequential can be in a duty cycle of switching timesharing IGBT that flows through make the loss of switching tube even, just can realize equal heating for the IGBT in the module like this, reduced electrical characteristics, caused the fault of IGBT owing to unbalanced warming-up effect switching tube.
This bridge circuit is used for the power cell of high voltage converter on the other hand, traditional unipolarity modulation divides the high and low frequency arm, and (G1 and G2 are that low frequency drives, such as when being output as 50Hz, G1, G2 is each conducting 10ms, G3, G4 copped wave under relative high frequency), utilize bilateral driving along structure than traditional unipolarity in this circuit structure, four switching tubes all are high frequency, bilateral driving pulse along type PWM structure produces the angle that needs to calculate zero crossing and comes, its switching angle must change with sinusoidal rule by the output voltage pulsewidth, so calculation of complex, but adopt traditional unipolarity pulsewidth to produce principle (interface point by carrier wave and modulating wave produces effective driving duty ratio) in this circuit, in power cell, finish driving IGBT in addition by isolation drive modular circuit (2SD315 or 2SC108T circuit), the drive signal of relative high frequency rate (with respect to the input of drive circuit) also is favourable to drive circuit, because driver module also will carry out input the modulation of higher frequency so that the signal transmission, prevent that rub-out signal from producing, drive with respect to traditional unipolarity mode and need take two aspects of low-and high-frequency into account, this circuit structure needs only the purpose that a kind of frequency is promptly finished outputting drive voltage pulse and positive-negative half-cycle, has simplified the design of hardware circuit.
From Fig. 2 as seen in a switch periods pulsewidth size by G1 and G2 (green area is effective output duty cycle, red be the afterflow period) change the positive and negative of output, by the overlapping size of pipe being changed the voltage pulsewidth of output pulse, and four switching tubes are respectively born continuous current circuit one time in a switch periods, like this when the band inductive load, four switching tubes just can reach equal heating, bring facility in the design for other manufacturing process, such as heat radiation and air channel, this driving sequential has increased the coefficient of safety of IGBT as much as possible simultaneously.The driving sequential of Fig. 2 shows that four switching tubes all are high-frequency drive, divide high frequency arm and low band arm than traditional unipolarity, the present invention has realized the unipolarity voltage pulse output equally, the unipolarity mode can realize the output of many level formula in unit cascaded on the other hand, and bipolarity can not realize this purpose.
Fig. 3 is the emulation sequential chart of demodulator circuit, the sequential chart of Fig. 3 (a) for carrying out demodulation by the high-frequency carrier signal that Optical Fiber Transmission is come, originally in the demodulation of CPLD circuit, carry out demodulation by some gate circuits and imitation monostable flipflop circuit, in the design, adopted the FSK demodulation, only the module that needs a VHDL to write just can be finished demodulation, so programmed readability is strong.Fig. 3 (b) is bilateral along structure generation circuit, carries out pulse by the time sequential pulse that demodulator circuit is produced and merges the driving sequential that is bilateral edge generation structure.This circuit utilizes triangular wave and modulating wave handing-over to produce effective drive signal, such algorithm is very ripe now, but giving the signal that is transferred to driving is bilateral along driving sequential (utilizing bilateral edge with effective output duty cycle voltage and the advantage of the positive and negative fusion of output in two signals), has simplified circuit design.
This on the other hand driving sequential also can effectively provide a current path for other unit under the output duty cycle voltage condition in this unit in high voltage converter units in series structure, when this unit is exported when effective, voltage also is added in the whole series arm simultaneously on it.
Claims (1)
1. Unipolar driving circuit, it is characterized in that comprising DC power supply (DC), four power switch pipes (G1～G4) and four fly-wheel diodes (D1～D4), wherein the positive pole of DC power supply (DC) meets the first and the 3rd power switch pipe (G1 respectively, G3) drain electrode and the first and the 3rd fly-wheel diode (D1, D3) negative electrode, the negative pole of DC power supply (DC) meets the second and the 4th power switch pipe (G2 respectively, G4) source electrode and the second and the 4th fly-wheel diode (D2, D4) anode, first power switch pipe (G1) connects the drain electrode of second power switch pipe (G2) respectively, the negative electrode of the anode of first fly-wheel diode (D1) and second fly-wheel diode (D2) and as the output of described drive circuit, the 3rd power switch pipe (G3) connects the drain electrode of the 4th power switch pipe (G4) respectively, the negative electrode of the anode of the 3rd fly-wheel diode (D3) and the 4th fly-wheel diode (D4) and as the input of described drive circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010102508A CN101800472A (en) | 2010-01-28 | 2010-01-28 | Unipolar driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010102508A CN101800472A (en) | 2010-01-28 | 2010-01-28 | Unipolar driving circuit |
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| CN101800472A true CN101800472A (en) | 2010-08-11 |
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| CN201010102508A Pending CN101800472A (en) | 2010-01-28 | 2010-01-28 | Unipolar driving circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017101839A1 (en) * | 2015-12-18 | 2017-06-22 | Byd Company Limited | Electric vehicle and vehicle-mounted charger and method for controlling the same |
| WO2017101837A1 (en) * | 2015-12-18 | 2017-06-22 | Byd Company Limited | Electric vehicle and vehicle-mounted charger and method for controlling the same |
| CN106891752A (en) * | 2015-12-18 | 2017-06-27 | 比亚迪股份有限公司 | The control method of electric automobile and its onboard charger and onboard charger |
| US10958181B2 (en) | 2016-12-02 | 2021-03-23 | Byd Company Limited | Electric vehicle, DC-DC convertor, and control method for DC-DC convertor |
-
2010
- 2010-01-28 CN CN201010102508A patent/CN101800472A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017101839A1 (en) * | 2015-12-18 | 2017-06-22 | Byd Company Limited | Electric vehicle and vehicle-mounted charger and method for controlling the same |
| WO2017101837A1 (en) * | 2015-12-18 | 2017-06-22 | Byd Company Limited | Electric vehicle and vehicle-mounted charger and method for controlling the same |
| CN106891752A (en) * | 2015-12-18 | 2017-06-27 | 比亚迪股份有限公司 | The control method of electric automobile and its onboard charger and onboard charger |
| CN106891752B (en) * | 2015-12-18 | 2019-12-10 | 比亚迪股份有限公司 | electric automobile, vehicle-mounted charger thereof and control method of vehicle-mounted charger |
| US10618416B2 (en) | 2015-12-18 | 2020-04-14 | Byd Company Limited | Electric vehicle, vehicle-mounted charger, and method for controlling the same |
| US10675978B2 (en) | 2015-12-18 | 2020-06-09 | Byd Company Limited | Electric vehicle, vehicle-mounted charger, and method for controlling the same |
| US10958181B2 (en) | 2016-12-02 | 2021-03-23 | Byd Company Limited | Electric vehicle, DC-DC convertor, and control method for DC-DC convertor |
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Open date: 20100811 |