CN101267156A - Separation driving circuit and control method with discharging channel - Google Patents
Separation driving circuit and control method with discharging channel Download PDFInfo
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- CN101267156A CN101267156A CNA200810067014XA CN200810067014A CN101267156A CN 101267156 A CN101267156 A CN 101267156A CN A200810067014X A CNA200810067014X A CN A200810067014XA CN 200810067014 A CN200810067014 A CN 200810067014A CN 101267156 A CN101267156 A CN 101267156A
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Abstract
The present invention provides an isolation driving circuit having a discharge path and its control method. The isolation driving circuit includes a control or driving unit, a driving transformer unit and a secondary line bootstrap circuit, the secondary line bootstrap circuit includes a bootstrap capacitor; the isolation driving circuit also includes a discharge circuit discharging for the bootstrap capacitor, the discharge circuit is parallel with the bootstrap diode, the discharge circuit further includes a switch, processing by passing the auxiliary winding. The control method of the isolation driving circuit includes: when the driving pulse of the isolation driving circuit is a high level, the bootstrap capacitor discharge circuit is turned off, the isolation driving circuit outputs the high level; when the driving pulse of the isolation driving circuit is a lower level, the bootstrap capacitor discharge circuit is turned on, the lower level of the isolation driving circuit output is zero. The invention ensures the normal working of the driving circuit when the duty cycle is large change. The auxiliary winding coil and the auxiliary switch can provide quick discharge circuit to the secondary line bootstrap capacitor, avoiding the miss guide of the power switch tube which is switched.
Description
Technical field
The invention belongs to field of switch power, relate to a kind of drive circuit that is applied to the Switching Power Supply power switch pipe, be specifically related to a kind of isolated drive circuit and control method thereof of high side power switching tube belt discharge path.
Background technology
For high frequency switch power, need or need and to isolate from the driving pulse and the power switch pipe of control circuit for the circuit safety consideration because topology is own.
Power switch pipe isolated drive circuit of the prior art such as Figure of description are shown in Figure 1, comprising: control or chip for driving, former limit capacitance C1, isolation drive transformer T1 and secondary bootstrap capacitor C2, bootstrap diode D1, resistance R 1 and R2.
The pulse square wave signal that described control or chip for driving are sent is sent to secondary through described former limit capacitance C1 and isolation drive transformer T1, the booster circuit of forming through described secondary bootstrap capacitor C2 and described bootstrap diode D1 pulse square wave signal that driving transformer is sent carries out current potential and promotes again, makes the pulse square wave waveform of final driving power switching tube follow the waveform of drive signal.
The resistance of described resistance R 1 is very little, is used for suppressing the vibration that the circuit equivalent inductance produces.
The technical problem that this isolated drive circuit exists in the prior art is: when the pulse square wave waveform duty cycle that sends when described control or chip for driving reduces fast, described former limit capacitance both end voltage also can acute variation, thereby makes described former limit capacitance and the former limit of driving transformer magnetizing inductance produce resonance.And the described bootstrap capacitor C2 of driving transformer secondary can only discharge by described resistance R 1 and described resistance R 2, and the resistance value of common described resistance R 2 is bigger, makes the voltage at its two ends not change according to the quick variation of duty ratio.Final drive waveforms low level is higher, can't turn-off driven power switch pipe.Shown in waveform such as Figure of description shown in Figure 2, the impulse waveform above in Fig. 2 is the waveform that control or chip for driving are sent, duty ratio from large to small, following impulse wave is the drive waveforms of M1 reality.
Summary of the invention
For solve exist in the prior art when control or the pulse square wave waveform duty cycle that sends of chip for driving reduce fast, make the former limit of former limit capacitance and driving transformer magnetizing inductance produce resonance, and the bootstrap capacitor C2 of driving transformer secondary can only be by resistance R 1 and resistance R 2 discharges, and the resistance value of resistance R 2 is bigger usually, make the voltage at its two ends not change according to the quick variation of duty ratio, final drive waveforms low level is higher, can't turn-off technical problems such as driven power switch pipe, the invention provides a kind of isolated drive circuit of belt discharge path.
For solve exist in the prior art when control or the pulse square wave waveform duty cycle that sends of chip for driving reduce fast, make the former limit of former limit capacitance and driving transformer magnetizing inductance produce resonance, and the bootstrap capacitor C2 of driving transformer secondary can only be by resistance R 1 and resistance R 2 discharges, and the resistance value of resistance R 2 is bigger usually, make the voltage at its two ends not change according to the quick variation of duty ratio, final drive waveforms low level is higher, can't turn-off technical problems such as driven power switch pipe, the present invention also provides a kind of isolated drive circuit control method of belt discharge path.
The present invention solves technical scheme that the prior art problem adopted for a kind of isolated drive circuit of belt discharge path is provided, described isolated drive circuit comprises: the driving voltage transformation unit and the secondary boostrap circuit of the control unit of generation driving pulse or driver element, one or more output, and described secondary boostrap circuit comprises bootstrap capacitor; It is characterized in that: described isolated drive circuit also is included as the discharge loop of described bootstrap capacitor discharge, and described discharge loop is in parallel with described bootstrap diode, comprises switch in the described discharge loop, and the control of described switch is undertaken by auxiliary winding.
According to a preferred embodiment of the invention: described discharge loop comprises switch and resistance, and described switch is a switching tube, and described switching tube and described resistance are the relation of being connected in series.
According to a preferred embodiment of the invention: the end of the same name of described auxiliary winding is connected with the non-same polarity of secondary winding, and the non-same polarity of described auxiliary winding is connected with the grid of described switch.
According to a preferred embodiment of the invention: described auxiliary winding is the thread switching control circle, and the turn ratio of described auxiliary winding and described former limit winding is 1: 1.
According to a preferred embodiment of the invention: switch is a N type switching tube in the described discharge loop, is specially N channel field-effect pipe or N type triode.
According to a preferred embodiment of the invention: switch is a P type switching tube in the described discharge loop, is specially P-channel field-effect transistor (PEFT) pipe or P type triode.
According to a preferred embodiment of the invention: described isolated drive circuit comprises the boostrap circuit in a plurality of described belt discharges loop; Described driving transformer comprises a plurality of described secondary windings, and described each secondary winding is connected with the boostrap circuit in its corresponding described each belt discharge loop, can drive a plurality of power switch pipes that need isolation simultaneously.
According to a preferred embodiment of the invention: described isolated drive circuit comprises the control unit or the driver element of a plurality of generation driving pulses.
The present invention solves technical scheme that the prior art problem adopted for a kind of isolated drive circuit control method of belt discharge path is provided, described isolated drive circuit control method is: when the driving pulse of described isolated drive circuit is high level, described bootstrap capacitor discharge loop is closed, described isolated drive circuit output high level; When the driving pulse of described isolated drive circuit was low level, described bootstrap capacitor discharge loop was opened, and the voltage at described bootstrap capacitor two ends drops to and the identical voltage of former limit capacitance at once, and the low level that makes described isolated drive circuit output is zero.
Beneficial effect of the present invention is: increased the discharge loop of bootstrap capacitor on the basis of conventional ADS driving circuit, drive circuit still can operate as normal when the assurance change in duty cycle was bigger.Auxiliary winding coil and auxiliary switch provide the repid discharge path can for the bootstrap capacitor of secondary, make the charging voltage of bootstrap capacitor can follow the isolation capacitance variation of former limit, and the power switch pipe of having avoided needing to turn-off misleads.
Description of drawings
Fig. 1. power switch pipe isolated drive circuit schematic diagram in the prior art;
Fig. 2. actual output duty cycle oscillogram when the isolated drive circuit duty ratio changes fast in the prior art;
Fig. 3. the isolated drive circuit schematic diagram of belt discharge path of the present invention;
Fig. 4. as the final drive waveforms figure that obtains during not with resistance R 3 that switching tube Q1 connects in the drive circuit;
Fig. 5. the circuit theory diagrams after switching tube Q1 is replaced by equivalent capacity in the drive circuit;
Fig. 6. adopt resulting output drive waveforms figure behind the Method and circuits of the present invention;
Fig. 7. first kind of way of realization circuit theory diagrams of the isolated drive circuit of belt discharge path of the present invention;
Fig. 8. second kind of way of realization circuit theory diagrams of the isolated drive circuit of belt discharge path of the present invention;
Fig. 9. the third way of realization circuit theory diagrams of the isolated drive circuit of belt discharge path of the present invention;
Figure 10. the isolated drive circuit of belt discharge path of the present invention is applied to the embodiment of multichannel output.
Embodiment
The technology of the present invention is parallel with controlled discharge loop at the two ends of secondary bootstrap diode 308 on the basis of traditional isolated drive circuit.When making the descending quick variation of former limit duty ratio, secondary bootstrap capacitor 305 can guarantee discharge rapidly, makes the drive signal low level of final output reduce to zero, connects misleading of power switch pipe after preventing.
Below in conjunction with accompanying drawing the present invention is launched explanation:
See also the isolated drive circuit schematic diagram of Fig. 3 belt discharge path of the present invention, as shown in Figure 3, former limit input signal interface enters circuit of the present invention thus from the driving pulse of control circuit; Described former limit capacitance C1304 is connected between driving pulse inlet and described driving isolating transformer former limit winding L p302 first end 1; Driving transformer T1309 comprises a former limit winding L p302, and one is secondary winding L s303, also needs the thread switching control circle 313 of a Q1, can be taken on by the auxiliary winding 313 of secondary, and the turn ratio can be chosen according to actual conditions.The connected mode of secondary winding 303 and auxiliary winding 313 can be to be with tapped coil as shown in the figure, also can be that two coils are cascaded.
Bootstrap capacitor C2305 one end connects the 3rd end 3 of secondary winding L s303, and the other end connects the negative electrode of bootstrap diode D1308; Bootstrap diode D1308 anode connects the 4th end 4 of secondary winding 303, and negative electrode connects bootstrap capacitor C2305; Resistance R 3307 and power switch pipe Q1306 are connected in parallel on the two ends of bootstrap diode D1308, and the five terminal 5 that drives winding 303 connects the grid of Q1306; The method of attachment of resistance R 1310 and resistance R 2311 is consistent with traditional circuit.
The operation principle of the isolated drive circuit of belt discharge path of the present invention is as described below:
When described control or chip for driving 301 are sent high level pulse, transfer the energy to described transformer secondary through described capacitance C1304 and the former limit of described transformer winding L p302.Thread switching control circle 313 triggers described power switch pipe Q1306 at this moment and closes, and high level is further passed to the driven switch M1312 in back after the lifting through described boostrap circuit C2305 and described bootstrap diode D1308 with voltage.
When described control or chip for driving 301 were sent low level pulse, the left end of described capacitance C1304 was equivalent to be pulled to ground.The former limit 302 of described driving transformer the 2nd end induces high level, and 1 end is a low level.Described thread switching control circle triggers described power switch pipe Q1306 conducting 313 this moments, so just makes described isolation capacitance C1304 and described bootstrap capacitor C2305 be connected in parallel, and the voltage at their two ends also is consistent.If duty ratio originally is bigger, make and have higher voltage on the described bootstrap capacitor C2305, when duty ratio reduces rapidly, described bootstrap capacitor C2305 can discharge by the loop that described power switch pipe Q1306 and Transformer Winding 313 are formed, avoided in the conventional ADS driving circuit owing to there is not discharge loop to cause the overtension of described bootstrap capacitor C2305, can't the driven switch M1312 of reliable turn-off.
If the resistance R 3307 of not connecting with described power switch pipe Q1306 in the drive circuit, the final drive waveforms that obtains so is shown in Figure of description 4.What chip for driving was sent is the impulse waveform of the ascending circulation change of duty ratio, and in the waveform of final output, the impulse wave of little duty ratio has all disappeared.The reason that produces this phenomenon is to have interelectrode capacitance between the drain-source utmost point of described power switch pipe Q1306, and equivalent electric circuit is shown in Figure of description 5.When duty ratio hour, the impulse wave that sends has been absorbed by the equivalent capacity Cds313 of described power switch pipe Q1305, can't pass to the circuit of back.In order to suppress the generation of this situation, described resistance R 3307 is connected in the circuit of described power switch pipe Q1306, be reduced to the electric current of described equivalent capacity Cds313 charging, make the impulse wave of little duty ratio also can pass to the circuit of back exactly.
Because described power switch pipe Q1306 has the bi directional conductibility characteristic, both can also can charge, so also can save need not for bootstrap diode D1308 for described bootstrap capacitor C2305 discharge for it.But owing to be in series with described resistance R 3307 in the loop of described power switch pipe Q1306, when having reduced described equivalent capacity Cds313 absorption current, also can suppress charging current to described bootstrap capacitor C2305, continue to keep described bootstrap diode D1308 and guaranteed described bootstrap capacitor C2305 quick charge, help the operate as normal of circuit.
After using drive circuit of the present invention, drive waveforms has had obvious improvement, and the final output waveform of drive circuit is shown in Figure of description 6 when the ascending circulation change of duty ratio, and visible output waveform has well been followed the impulse waveform of input.
See also Figure of description Fig. 7, first kind of way of realization circuit theory diagrams of the isolated drive circuit of belt discharge path of the present invention. as shown in Figure 7, the Q1306 of power switch pipe described in Fig. 3 is used N type switching tube 306: as N channel field-effect pipe or N type triode etc.When the impulse wave that sends when described driving or control chip 301 was high level, the ancillary coil 313 of described control Q1 drove described N type switching tube Q1306 and closes, and drive circuit is output as high level.When the impulse wave that sends when described driving or control chip 301 was low level, the ancillary coil 313 of described control Q1 drove described N type switching tube Q1306 conducting, and described bootstrap capacitor C2305 can finish quick impulse electricity, and output voltage is zero.
See also second kind of way of realization circuit theory diagrams of the isolated drive circuit of Figure of description Fig. 8 belt discharge path of the present invention, as shown in Figure 8, the Q1306 of power switch pipe described in Fig. 3 is used P type switching tube 306: as the P-channel field-effect transistor (PEFT) pipe, P type triode etc.When the impulse wave that sends when described driving or control chip 301 was high level, the ancillary coil 313 of described control Q1 drove described P type switching tube Q1 and closes, and drive circuit is output as high level.When the impulse wave that sends when described driving or control chip 301 was low level, the ancillary coil 313 of control Q1 drove described P type switching tube Q1306 conducting, and described bootstrap capacitor C2305 can finish quick impulse electricity, and output voltage is zero.
Because described power switch pipe Q1306 injects bigger electric current need in switch motion the electric capacity between the grid source electrode, and the big more switching speed of current value is fast more, loss is more little.In order to improve the driving force of drive circuit, can use the chip for driving of two or more logical complements to be connected on the two ends of former limit drive circuit respectively on the former limit of transformer, shown in the third way of realization circuit theory diagrams of the isolated drive circuit of Figure of description 9 belt discharge paths of the present invention.The logical relation complementation of chip for driving 3011 and chip for driving 3012 output waveforms can be adopted a chip for driving separately, also can adopt a plurality of chip for driving form of using in parallel to improve driving force.The primary coil bidirectional excitation of described driving transformer T1309, driving voltage was doubled than originally, the also corresponding raising of drive current, the switching speed that helps improving power switch pipe reduces loss.
The isolated drive circuit that sees also Figure of description Figure 10 belt discharge path of the present invention is applied to the embodiment of multichannel output, and as shown in figure 10, described isolated drive circuit comprises a plurality of described discharge loops; Described driving transformer comprises a plurality of described secondary winding L s1 3031...Lsn3032, described each secondary winding L s 1 3031...Lsn3032 (quantity of described secondary winding is more than or equal to 2) is connected with its corresponding described each discharge loop, can drive a plurality of power switch pipe Q 13061, Q23062...Qn (quantity of described power switch pipe is more than or equal to 2) that need isolation simultaneously.
The present invention has increased the discharge loop of bootstrap capacitor on the basis of conventional ADS driving circuit, drive circuit still can operate as normal when the assurance change in duty cycle was bigger.Auxiliary winding coil and auxiliary switch provide the repid discharge path can for the bootstrap capacitor of secondary, make the charging voltage of bootstrap capacitor can follow the isolation capacitance variation of former limit, and the power switch pipe of having avoided needing to turn-off misleads.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (9)
1. the isolated drive circuit of a belt discharge path, described isolated drive circuit comprises: produce control unit or driver element (301), driving transformer unit (309) and the secondary boostrap circuit of driving pulse, described secondary boostrap circuit comprises bootstrap capacitor (305); It is characterized in that: described isolated drive circuit also is included as the discharge loop of described bootstrap capacitor (305) discharge, described discharge loop is in parallel with described bootstrap diode (308), comprise switch (306) in the described discharge loop, the control of described switch (306) is undertaken by auxiliary winding (313).
2. according to the described isolated drive circuit of claim 1, it is characterized in that: described discharge loop comprises switch (306) and resistance (307), and described switch (306) is a switching tube, and described switching tube is the relation of being connected in series with (306) described resistance (307).
3. according to the described isolated drive circuit of claim 1, it is characterized in that: the end of the same name of described auxiliary winding (313) is connected with the non-same polarity of secondary winding (303), and the non-same polarity of described auxiliary winding (313) is connected with the grid of described switch (306).
4. according to claim 1 or 3 described isolated drive circuits, it is characterized in that: described auxiliary winding (313) is the thread switching control circle, and described auxiliary winding (313) is 1: 1 with the turn ratio of described former limit winding (302).
5. according to claim 1 or 2 described isolated drive circuits, it is characterized in that: switch in the described discharge loop (306) is a N type switching tube (306), is specially N channel field-effect pipe or N type triode.
6. according to claim 1 or 2 described isolated drive circuits, it is characterized in that: switch in the described discharge loop (306) is a P type switching tube (306), is specially P-channel field-effect transistor (PEFT) pipe or P type triode.
7. according to the described isolated drive circuit of claim 1, it is characterized in that: described isolated drive circuit comprises the boostrap circuit in a plurality of described belt discharges loop; Described driving transformer (309) comprises a plurality of described secondary windings (3031,3032), described each secondary winding (3031,3032) is connected with the boostrap circuit in its corresponding described each belt discharge loop, can drive a plurality of power switch pipes (3061,3062) that need isolation simultaneously.
8. according to the described isolated drive circuit of claim 1, it is characterized in that: described isolated drive circuit comprises the control unit or the driver element (3011,1012) of a plurality of generation driving pulses.
9. the isolated drive circuit control method of a belt discharge path, it is characterized in that: described isolated drive circuit control method is:
When the driving pulse of described isolated drive circuit was high level, described bootstrap capacitor (305) discharge loop was closed, described isolated drive circuit output high level;
When the driving pulse of described isolated drive circuit is low level, described bootstrap capacitor (305) discharge loop is opened, the voltage at described bootstrap capacitor (305) two ends drops to and the identical voltage of former limit capacitance (304) at once, and the low level that makes described isolated drive circuit output is zero.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810067014XA CN101267156B (en) | 2008-04-29 | 2008-04-29 | Separation driving circuit with discharging channel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200810067014XA CN101267156B (en) | 2008-04-29 | 2008-04-29 | Separation driving circuit with discharging channel |
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| CN101267156A true CN101267156A (en) | 2008-09-17 |
| CN101267156B CN101267156B (en) | 2011-03-30 |
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| CN200810067014XA Expired - Fee Related CN101267156B (en) | 2008-04-29 | 2008-04-29 | Separation driving circuit with discharging channel |
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| CN102280990A (en) * | 2011-08-26 | 2011-12-14 | 北京新雷能科技股份有限公司 | Magnetic isolation driving circuit |
| CN102307003A (en) * | 2011-09-14 | 2012-01-04 | 深圳航天科技创新研究院 | Insulation driving circuit of power switching tube |
| CN102315759A (en) * | 2010-07-05 | 2012-01-11 | 通用电气公司 | Gate driving controller circuitry and power-up circuit thereof with anti saturation circuit |
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| CN103051160A (en) * | 2012-12-10 | 2013-04-17 | 广州金升阳科技有限公司 | Magnetic isolation driving circuit |
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| CN103066814B (en) * | 2011-10-24 | 2016-07-27 | 中兴通讯股份有限公司 | A kind of isolated drive circuit |
| CN102916570B (en) * | 2012-09-27 | 2015-04-22 | 安徽动力源科技有限公司 | Isolated driving circuit |
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| CN103051160A (en) * | 2012-12-10 | 2013-04-17 | 广州金升阳科技有限公司 | Magnetic isolation driving circuit |
| CN103051160B (en) * | 2012-12-10 | 2015-04-08 | 广州金升阳科技有限公司 | Magnetic isolation driving circuit |
| CN104065251A (en) * | 2013-03-18 | 2014-09-24 | 意法半导体研发（上海）有限公司 | Driver circuit with controlled gate discharge current |
| CN104065251B (en) * | 2013-03-18 | 2017-03-15 | 意法半导体研发（上海）有限公司 | There is the drive circuit of controlled gate discharge current |
| CN103337839B (en) * | 2013-06-26 | 2015-12-23 | 国家电网公司 | A kind of MOS door PLC optocoupler drive circuit and resistance loop device |
| CN103414354B (en) * | 2013-07-16 | 2015-08-05 | 燕山大学 | Device for power switching pulse transformer isolated drive circuit |
| CN103414354A (en) * | 2013-07-16 | 2013-11-27 | 燕山大学 | Power switch device pulse transformer isolation driving circuit |
| CN103817407A (en) * | 2014-03-14 | 2014-05-28 | 上海沪工焊接集团股份有限公司 | Driving circuit |
| CN107404778A (en) * | 2016-05-18 | 2017-11-28 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic Heating cooking system and its drive control circuit, detection method |
| CN112514222A (en) * | 2020-01-21 | 2021-03-16 | 深圳市大疆创新科技有限公司 | Demodulation circuit, pulse generation circuit and isolation drive circuit for isolation drive circuit |
| WO2021146909A1 (en) * | 2020-01-21 | 2021-07-29 | 深圳市大疆创新科技有限公司 | Demodulation circuit for isolation drive circuit, pulse generation circuit, and isolation drive circuit |
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| CN101267156B (en) | 2011-03-30 |
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