CN104467380A - Driving device and method - Google Patents
Driving device and method Download PDFInfo
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- CN104467380A CN104467380A CN201410856173.3A CN201410856173A CN104467380A CN 104467380 A CN104467380 A CN 104467380A CN 201410856173 A CN201410856173 A CN 201410856173A CN 104467380 A CN104467380 A CN 104467380A
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- 230000000295 complement effect Effects 0.000 claims abstract description 48
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- 230000005669 field effect Effects 0.000 claims description 67
- 230000002708 enhancing effect Effects 0.000 claims description 8
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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Abstract
The invention discloses a driving device, comprising: the driving circuit comprises a first driving end, a second driving end, a driving circuit, a first output end, a second output end, a third output end and a fourth output end; the first driving end and the second driving end input complementary PWM input signals with dead time, and the first driving signal and the second driving signal which are used for driving the double-tube forward conversion network and the third driving signal and the fourth driving signal which are used for driving the synchronous rectification conversion network are obtained after signal processing is carried out on the complementary PWM input signals with dead time by the driving circuit; the first driving signal, the second driving signal, the third driving signal and the fourth driving signal are simultaneously output through a first output end, a second output end, a third output end and a fourth output end respectively. The invention also discloses a driving method. By adopting the embodiment of the invention, the driving mode is simple, the cost is reduced, and the compatibility, efficiency and stability of the product are improved.
Description
Technical field
The present invention relates to electronic technology field, particularly relate to a kind of drive unit and method.
Background technology
Compared with conventional linear power supply, it is little that Switching Power Supply has volume, the feature that conversion efficiency is high, is widely used in the various electronic equipment such as Industry Control, communication office, household consumption.
High efficiency, ultra-thin, small size, low middle power product are the main products being applied to power supply in electronic equipment at present.In order to raise the efficiency, usually select the topology (LLC half-bridge resonance, asymmetrical half-bridge, double tube positive exciting) of Sofe Switch to add to export synchronous rectification (self-powered synchronous rectification, the synchronous rectification of IC control chip, it drives formula synchronous rectification) mode.
Use and export synchronous rectification, no matter adopt which kind of mode, all need power supply reliability high stability strong.Therefore just need to overcome the common of rectifying tube and continued flow tube, namely when rectifying tube is opened, continued flow tube does not also enter off state, the phenomenon of at this moment two pipes conducting simultaneously.
In order to express more clearly, introduce double tube positive exciting circuit of synchronous rectification and the drive circuit thereof of prior art below in conjunction with Fig. 1 to Fig. 3.
Fig. 1 is double tube positive exciting synchronous rectification topological circuit schematic diagram in prior art.As shown in Figure 1, its limit, Central Plains is double tube positive exciting converting network, and secondary is synchronous rectification converting network.Q300, Q302, D300, D302 constitute double tube positive exciting topological structure for former limit; VDC+ is AC rectification filtering voltage interface; DRVA is that upper pipe drives, DRVB is that lower pipe drives.Secondary Q403, Q401, LB400, EC400 form MOSFET synchronous rectification network; Synchronous rectifier Q403 drives and adopts the self-driven mode of main transformer TB1 to supply; Synchronous freewheeling pipe Q401 drives and adopts former limit pwm signal to transmit supply, drive circuit through continued flow tube drive circuit isolating transformer T301A.
Fig. 2 is drive circuit schematic diagram two-tube in double tube positive exciting converting network in prior art.
Wherein DRV provides pwm signal by control chip, through R305, R306, C302, the delay circuit of Q303, be supplied to by Q301 after time delay is carried out to pwm signal, the totem drive circuit of Q304 composition, two windings are divided into the master power switch pipe Q300 of double tube positive exciting again by driving isolation transformer T300A, Q302 provides drive singal, for controlling master power switch pipe Q300, Q302 opens delay, thus the on-delay of control synchronization rectifying tube Q403, keep the service time of synchronous freewheeling pipe Q401 constant, thus dead band is formed between synchronous rectifier Q403 and synchronous freewheeling pipe Q401, prevent two switching tubes common.
Fig. 3 is the drive circuit schematic diagram of continued flow tube in synchronous rectification converting network in prior art.
DRV provides pwm signal by control chip, negater circuit is formed through R327, RC301, C307, Q312, carry out being supplied to the totem drive circuit be made up of RC300, Q309, Q310 oppositely to pwm signal, there is provided drive singal by driving isolation transformer T301A vice-side winding to synchronous freewheeling pipe Q401 again, ensure that stablizing of continued flow tube is open-minded.
The shortcoming that prior art exists mainly contains:
1, in prior art, need to carry out continued flow tube in two-tube in corresponding driving double tube positive exciting converting network and synchronous rectification converting network respectively by two drive circuits, circuit is complicated, high expensive.
2, in prior art, the driving voltage of secondary rectifying tube takes from main transformer vice-side winding, when electric power output voltage is higher, and input voltage range very wide time, drive circuit loss can be caused very large, thus the synchronous rectification of high output voltage equipment cannot be realized, have a strong impact on compatibility and the efficiency of product.
3, drive circuit of the prior art only can realize opening time delay between secondary synchronous rectifier and continued flow tube, and cannot realize turn off delay time, product stability is poor.
Summary of the invention
Technical problem to be solved by this invention is, provides a kind of drive unit and method, makes type of drive simple, reduces costs, and improves the compatibility of product, efficiency and stability.
In order to solve the problems of the technologies described above, the present invention proposes a kind of drive unit, described drive unit comprises the first drive end, the second drive end, drive circuit, the first output, the second output, the 3rd output and the 4th output;
By the complementary PWM input signal with Dead Time that described first drive end and described second drive end input, carry out after signal transacting through described drive circuit, obtain the 3rd drive singal, the four-wheel drive signal that are respectively used to drive the first drive singal of described double tube positive exciting converting network, the second drive singal and drive described synchronous rectification converting network;
Described first drive singal, described second drive singal, described 3rd drive singal and described four-wheel drive signal export respectively by described first output, described second output, described 3rd output and described 4th output simultaneously; Wherein, described first drive singal and described second drive singal are in-phase signal, and described 3rd drive singal and described four-wheel drive signal are the complementary PWM output signal with Dead Time.
As the improvement of technique scheme, state drive circuit and comprise transformer; Described transformer comprises former limit winding, the first vice-side winding, the second vice-side winding, the 3rd vice-side winding and the 4th vice-side winding; Described first drive end and described second drive end are connected with the first end of the former limit winding of described transformer and the second end respectively; Described first output is connected with the first end of described first vice-side winding, described second output is connected with the first end of described second vice-side winding, described 3rd output is connected with the first end of described 3rd vice-side winding, and described 4th output is connected with the first end of described 4th vice-side winding;
The first end of the first end of described first vice-side winding, the first end of described second vice-side winding, described 3rd vice-side winding and the first end of described former limit winding are Same Name of Ends, and the first end of described 4th vice-side winding and the first end of described former limit winding are not Same Name of Ends.
As the improvement of technique scheme, described drive unit also comprises signal adjustment circuit, and described signal adjustment circuit receives described complementary PWM input signal, and sends to described drive circuit after described complementary PWM input signal being carried out corresponding enhancing process; Described first drive end and described second drive end are connected with the first end of the former limit winding of described transformer and the second end respectively by described signal adjustment circuit.
As the improvement of technique scheme, described signal adjustment circuit comprises the first adjustment unit and the second adjustment unit; Described first adjustment unit comprises the first switching tube and second switch pipe, the common port access direct voltage of the first switching tube, the common end grounding of second switch pipe, the control end of the first switching tube and the control end of second switch pipe are connected to the first drive end jointly, and the output of the first switching tube and the output of second switch pipe are connected to the first end of the former limit winding of described transformer jointly; Described second adjustment unit comprises the 3rd switching tube and the 4th switching tube, the common port access direct voltage of the 3rd switching tube, the common end grounding of the 4th switching tube, the control end of the 3rd switching tube and the control end of the 4th switching tube are connected to the second drive end jointly, and the output of the 3rd switching tube and the output of the 4th switching tube are connected to the second end of the former limit winding of described transformer jointly; Described complementary PWM input signal controls described first switching tube, described second switch pipe, described 3rd switching tube and described 4th switching tube and is operated in conducting state or cut-off state.
As the improvement of technique scheme, described signal adjustment circuit also comprises the first resistance, the second resistance, electric capacity, the first diode, the second diode, the 3rd diode and the 4th diode; The control end of described first switching tube and the control end of described second switch pipe are connected to described first drive end jointly by described first resistance; The control end of described 3rd switching tube and the control end of described 4th switching tube are connected to described second drive end jointly by described second resistance; The output of described first switching tube and the output of described second switch pipe are connected to the first end of the former limit winding of described transformer jointly by described electric capacity; The anode of described first diode is connected with the first end of the former limit winding of described transformer, and the negative electrode of described first diode is connected with the output of described first switching tube; The plus earth of described second diode, the negative electrode of described second diode is connected with the output of described first switching tube; The plus earth of described 3rd diode, the negative electrode of described 3rd diode is connected with the output of described 3rd switching tube; The plus earth of described 4th diode, the negative electrode of described 4th diode is connected with the output of described 3rd switching tube.
As the improvement of technique scheme, described drive circuit also comprises the 3rd resistance, the 4th resistance, the 5th resistance and the 6th resistance; Described first output is connected with the first end of described first vice-side winding by described 3rd resistance, described second output is connected with the first end of described second vice-side winding by described 4th resistance, described 3rd output is connected with the first end of described 3rd vice-side winding by described 5th resistance, and described 4th output is connected with the first end of described 4th vice-side winding by described 6th resistance.
The invention allows for a kind of driving method, comprise step:
Receive the complementary PWM input signal with Dead Time;
After signal transacting is carried out to described complementary PWM input signal, obtain the 3rd drive singal, the four-wheel drive signal that are respectively used to drive the first drive singal of described double tube positive exciting converting network, the second drive singal and drive described synchronous rectification converting network; Wherein, described first drive singal and described second drive singal are in-phase signal, and described 3rd drive singal and described four-wheel drive signal are the complementary PWM output signal with Dead Time;
Described first drive singal, described second drive singal, described 3rd drive singal and described four-wheel drive signal are exported.
As the improvement of technique scheme, also comprise after the complementary PWM input signal of described reception with Dead Time: corresponding enhancing process is carried out to described complementary PWM input signal;
Described signal transacting is carried out to described complementary PWM input signal after, the 3rd drive singal obtaining being respectively used to drive the first drive singal of described double tube positive exciting converting network, the second drive singal and drive described synchronous rectification converting network, four-wheel drive signal specifically comprise: after carrying out signal transacting to the described complementary PWM input signal after strengthening, obtain the 3rd drive singal, the four-wheel drive signal that are respectively used to drive the first drive singal of described double tube positive exciting converting network, the second drive singal and drive described synchronous rectification converting network.
Implement the embodiment of the present invention, there is following beneficial effect:
The drive unit that the embodiment of the present invention provides, after the described complementary PWM input signal received is carried out signal transacting, obtains the drive singal being respectively used to drive described double tube positive exciting converting network and described synchronous rectification converting network; The drive circuit of double tube positive exciting converting network and described synchronous rectification converting network is incorporated in a circuit, simplifies circuit to the utmost, reduce costs, improve reliability; Drive singal due to secondary rectifying tube is no longer taken from main transformer and is exported winding, when electric power output voltage is higher, also drive circuit loss can not be caused very large, and then the synchronous rectification of high output voltage equipment can be realized, enhance compatibility and the efficiency of product; The drive singal that two outputs connecting the rectifying tube of described synchronous rectification converting network and continued flow tube export is the complementary PWM output signal with Dead Time, make the rectifying tube of synchronous rectification converting network and continued flow tube can not conducting simultaneously, can not only realize opening time delay between secondary synchronous rectifier and continued flow tube, can also turn off delay time be realized, improve the stability of product.
Accompanying drawing explanation
Fig. 1 is double tube positive exciting synchronous rectification topological circuit schematic diagram in prior art;
Fig. 2 is drive circuit schematic diagram two-tube in double tube positive exciting converting network in prior art;
Fig. 3 is the drive circuit schematic diagram of continued flow tube in double tube positive exciting converting network in prior art;
Fig. 4 is the structural representation of the first embodiment of drive unit provided by the invention;
Fig. 5 is the structural representation of the second embodiment of drive unit provided by the invention;
Fig. 6 a is the oscillogram of the drive singal that drive unit provided by the invention inputs;
Fig. 6 b is the oscillogram of the level value of the first end W11 of the former limit winding 307 of double tube positive exciting circuit of synchronous rectification provided by the invention;
Fig. 6 c is the oscillogram of the drive singal that drive unit provided by the invention exports;
Fig. 7 is the structural representation of the 3rd embodiment of drive unit provided by the invention;
Fig. 8 is the schematic flow sheet of an embodiment of driving method provided by the invention;
Fig. 9 is the schematic flow sheet of another embodiment of driving method provided by the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
See Fig. 4, it is the structural representation of the first embodiment of drive unit provided by the invention.
A kind of drive unit that the embodiment of the present invention provides, for driving double tube positive exciting converting network and the synchronous rectification converting network of double tube positive exciting circuit of synchronous rectification, described drive unit comprises the first drive end 201, second drive end 202, drive circuit 203, first output 204, second output 205, the 3rd output 206 and the 4th output 207;
By the complementary PWM input signal with Dead Time that described first drive end 201 and described second drive end 202 input, after described drive circuit 203 carries out signal transacting, obtain the 3rd drive singal, the four-wheel drive signal that are respectively used to drive the first drive singal of described double tube positive exciting converting network, the second drive singal and drive described synchronous rectification converting network;
Described first drive singal, described second drive singal, described 3rd drive singal and described four-wheel drive signal export respectively by described first output 204, described second output 205, described 3rd output 206 and described 4th output 207 simultaneously; Wherein, described first drive singal and described second drive singal are in-phase signal, and described 3rd drive singal and described four-wheel drive signal are the complementary PWM output signal with Dead Time.
Concrete, described drive circuit 203 comprises transformer; Described transformer comprises former limit winding, the first vice-side winding, the second vice-side winding, the 3rd vice-side winding and the 4th vice-side winding; Described first drive end 201 and described second drive end 202 are connected with the first end of the former limit winding of described transformer and the second end respectively; Described first output 204 is connected with the first end of described first vice-side winding, described second output 205 is connected with the first end of described second vice-side winding, described 3rd output 206 is connected with the first end of described 3rd vice-side winding, and described 4th output 207 is connected with the first end of described 4th vice-side winding; The first end of the first end of described first vice-side winding, the first end of described second vice-side winding, described 3rd vice-side winding and the first end of described former limit winding are Same Name of Ends, and the first end of described 4th vice-side winding and the first end of described former limit winding are not Same Name of Ends.
Described drive unit also comprises signal adjustment circuit, and described signal adjustment circuit receives described complementary PWM input signal, and sends to described drive circuit after described complementary PWM input signal being carried out corresponding enhancing process; Described first drive end 201 and described second drive end 202 are connected with the first end of the former limit winding of described transformer and the second end respectively by described signal adjustment circuit.
Described signal adjustment circuit comprises the first adjustment unit and the second adjustment unit; Described first adjustment unit comprises the first switching tube and second switch pipe, the common port access direct voltage of the first switching tube, the common end grounding of second switch pipe, the output of output and second switch pipe that the control end of the first switching tube and the control end of second switch pipe are connected to the first drive end 201, first switching tube is jointly connected to the first end of the former limit winding of described transformer jointly; Described second adjustment unit comprises the 3rd switching tube and the 4th switching tube, the common port access direct voltage of the 3rd switching tube, the common end grounding of the 4th switching tube, the output of output and the 4th switching tube that the control end of the 3rd switching tube and the control end of the 4th switching tube are connected to the second drive end the 202, three switching tube is jointly connected to the second end of the former limit winding of described transformer jointly; Described complementary PWM input signal controls described first switching tube, described second switch pipe, described 3rd switching tube and described 4th switching tube and is operated in conducting state or cut-off state.
Described signal adjustment circuit also comprises the first resistance, the second resistance, electric capacity, the first diode, the second diode, the 3rd diode and the 4th diode; The control end of described first switching tube and the control end of described second switch pipe are connected to described first drive end 201 jointly by described first resistance; The control end of described 3rd switching tube and the control end of described 4th switching tube are connected to described second drive end 202 jointly by described second resistance; The output of described first switching tube and the output of described second switch pipe are connected to the first end of the former limit winding of described transformer jointly by described electric capacity; The anode of described first diode is connected with the first end of the former limit winding of described transformer, and the negative electrode of described first diode is connected with the output of described first switching tube; The plus earth of described second diode, the negative electrode of described second diode is connected with the output of described first switching tube; The plus earth of described 3rd diode, the negative electrode of described 3rd diode is connected with the output of described 3rd switching tube; The plus earth of described 4th diode, the negative electrode of described 4th diode is connected with the output of described 3rd switching tube.
Described drive circuit also comprises the 3rd resistance, the 4th resistance, the 5th resistance and the 6th resistance; Described first output 204 is connected with the first end of described first vice-side winding by described 3rd resistance, described second output 205 is connected with the first end of described second vice-side winding by described 4th resistance, described 3rd output 206 is connected with the first end of described 3rd vice-side winding by described 5th resistance, and described 4th output 207 is connected with the first end of described 4th vice-side winding by described 6th resistance.
In the middle of concrete enforcement, the switching tube in drive circuit can be the three side controller parts such as triode, field effect transistor, IGBT, thyristor or its derivation device.Wherein, the control end of switching tube, common port and output, the base stage of triode, collector electrode, emitter can be corresponded respectively to, the grid of field effect transistor, drain electrode, source electrode, the grid of IGBT, collector electrode, emitter, the grid of unidirectional thyristor, anode, negative electrode, the grid of bidirectional thyristor, port 2, port one.
Below for convenience of description, be only described for triode, the technical scheme of field effect transistor to the embodiment of the present invention respectively, the switching tube in the drive unit that the embodiment of the present invention provides is not limited to triode, field effect transistor.
See Fig. 5, it is the structural representation of the second embodiment of drive unit provided by the invention.
Wherein, the first drive end DRV1 and the second drive end DRV2 is for inputting the complementary PWM input signal with Dead Time.By the complementary PWM input signal with Dead Time that described first drive end DRV1 and described second drive end DRV2 inputs, first carry out corresponding enhancing process through described signal adjustment circuit, carry out after signal transacting through described drive circuit again, obtain the 3rd drive singal, the four-wheel drive signal that are respectively used to drive the first drive singal of described double tube positive exciting converting network, the second drive singal and drive described synchronous rectification converting network;
Concrete, as shown in Figure 5, described drive circuit comprises transformer T301; Described transformer T301 comprises former limit winding 307, first vice-side winding 305, second vice-side winding 302, the 3rd vice-side winding 310 and the 4th vice-side winding 312;
Described first drive end DRV1 and described second drive end DRV2 are connected with the first end W11 of the former limit winding of described transformer and the second end W12 respectively; Described first output DRVA is connected with the first end W21 of the first vice-side winding 305, and the second end W22 of the first vice-side winding 305 connects a sampled voltage signal, for the first output DRVA provides reference level; Described second output DRVB is connected with the first end W31 of the second vice-side winding 302, and the second end W32 of the second vice-side winding 302 connects a leaping voltage signal, for the second output DRVB provides reference level; Described 3rd output DRVD1 is connected with the first end W41 of the 3rd vice-side winding 310, the second end W42 ground connection of the 3rd vice-side winding 310; Described 4th output DRVD2 is connected with the first end W51 of the 4th vice-side winding 312; Second end W52 ground connection of the 4th vice-side winding 312; The first end W21 of the first vice-side winding 305, the first end W31 of the second vice-side winding 302, the first end W41 of the 3rd vice-side winding 310 and the first end W11 of former limit winding 307 are Same Name of Ends, and the first end W51 of the 4th the vice-side winding 312 and first end W11 of former limit winding 307 is not Same Name of Ends.
The drive singal of the upper pipe of described double tube positive exciting converting network exports from the first output DRVA, the drive singal of the lower pipe of described double tube positive exciting converting network exports from the second output DRVB, the drive singal of the rectifying tube of described synchronous rectification converting network exports from the 3rd output DRVD1, and the drive singal of the continued flow tube of described synchronous rectification converting network exports from the 4th output DRVD2.
Further, described drive unit also comprises signal adjustment circuit, and described signal adjustment circuit receives described complementary PWM input signal, and sends to described drive circuit after described complementary PWM input signal being carried out corresponding enhancing process; Described first drive end DRV1 and described second drive end DRV2 are connected with the first end W11 of the former limit winding of described transformer and the second end W12 respectively by described signal adjustment circuit.
Described signal adjustment circuit comprises the first adjustment unit and the second adjustment unit;
Described first adjustment unit comprises the first triode Q1 and the second triode Q2, first triode Q1 is NPN type, the collector electrode access direct voltage of the first triode Q1, second triode Q2 is positive-negative-positive, the grounded collector of the second triode Q2, the base stage of the first triode Q1 and the base stage of the second triode Q2 are connected to the first drive end DRV1 jointly, and the emitter of the first triode Q1 and the emitter of the second triode Q2 are connected to the first end W11 of the former limit winding 307 of transformer T301 jointly;
Described second adjustment unit comprises the 3rd triode Q3 and the 4th triode Q4,3rd triode Q3 is NPN type, the collector electrode access direct voltage of the 3rd triode Q3,4th triode Q4 is positive-negative-positive, the grounded collector of the 4th triode Q4, the base stage of the 3rd triode Q3 and the base stage of the 4th triode Q4 are connected to the second drive end DRV2 jointly, and the emitter of the 3rd triode Q3 and the emitter of the 4th triode Q4 are connected to the second end W12 of the former limit winding 307 of transformer T301 jointly.
Described complementary PWM input signal controls described first triode Q1, described second triode Q2, described 3rd triode Q3 and described 4th triode Q4 and is operated in conducting state or cut-off state.
Described signal adjustment circuit also comprises the first resistance R1, the second resistance R2, electric capacity C1, the first diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4.The base stage of described first triode Q1 and the base stage of the second triode Q2 are connected to described first drive end DRV1 jointly by the first resistance R1; The base stage of described 3rd triode Q3 and the base stage of the 4th triode Q4 are connected to the second drive end DRV2 jointly by the second resistance R2; The emitter of described first triode Q1 and the emitter of the second triode Q2 are connected to the first end W11 of the former limit winding 307 of described transformer T301 jointly by described electric capacity C1; The anode of described first diode D1 is connected with the former limit winding 307 of described transformer, and the negative electrode of described first diode D1 is connected with the emitter of described first triode Q1; The plus earth of described second diode D2, the negative electrode of described second diode D2 is connected with the emitter of described first triode Q1; The plus earth of described 3rd diode D3, the negative electrode of described 3rd diode D3 is connected with the emitter of described 3rd triode Q3; The plus earth of described 4th diode D4, the negative electrode of described 4th diode D4 is connected with the emitter of described 3rd triode Q3.
Described drive circuit also comprises the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5 and the 6th resistance R6;
Described first output DRVA is connected with the first end W21 of described first vice-side winding 305 by described 3rd resistance R3, described second output DRVB is connected with the first end W31 of described second vice-side winding 302 by described 4th resistance R4, described 3rd output DRVD1 is connected with the first end W41 of described 3rd vice-side winding 310 by described 5th resistance R5, and described 4th output DRVD2 is connected with the first end W51 of described 4th vice-side winding 312 by described 6th resistance R6.
Below in conjunction with Fig. 6 a-6c, the specific works state of drive unit provided by the invention is described.
When power supply normally works, complementary PWM input signal with Dead Time (a) is input in two driving signal input see Fig. 6, after the current limliting of the first resistance R1 and the second resistance R2, control the first triode Q1, second triode Q2, 3rd triode Q3 and the 4th triode Q4 makes corresponding switch motion, to increase the current amplitude of input signal, complementary PWM input signal is added in (oscillogram of the level value of the first end W11 of former limit winding 307 is see Fig. 6 b) on the former limit winding of driving transformer after strengthening, by the mutual inductance principle of transformer, the drive singal (oscillogram of the drive singal of output is see Fig. 6 c) of four field effect transistor double tube positive exciting circuit of synchronous rectification is exported respectively from the drive singal output of connection transformer vice-side winding.
The specific works state of this drive circuit is as follows:
(1) when the first drive end DRV1 is input as high level, when second drive end DRV2 is input as low level, first triode Q1, 4th triode Q4 conducting, second triode Q2, 3rd triode Q3 ends, the first end W11 of former limit winding 307 is made to be high level, second end W12 is low level, so the first end W21 of the first vice-side winding 305, the first end W31 of the second vice-side winding 302, the first end W41 of the 3rd vice-side winding 310 and the second end W52 of the 4th vice-side winding 312 is high level simultaneously, second end W22 of the first vice-side winding 305, second end W32 of the second vice-side winding 302, second end W42 of the 3rd the vice-side winding 310 and first end W51 of the 4th vice-side winding 312 is low level simultaneously, accordingly, first output DRVA, second output DRVB, 3rd output DRVD1 exports as high level, 4th output DRVD2 exports as low level, and then drive the upper pipe of double tube positive exciting converting network and lower pipe, the rectifying tube conducting of synchronous rectification converting network, drive the continued flow tube cut-off of synchronous rectification converting network, the former limit of power supply is to secondary transmitting energy.
(2) as the first drive end DRV1, when second drive end DRV2 is input as low level, second triode Q2, 4th triode Q4 conducting, first triode Q1, 3rd triode Q3 ends, the former limit winding two-terminal-grounding of transformer, so the first end W21 of the first vice-side winding 305 and the second end W22, the first end W31 of the second vice-side winding 302 and the second end W32, the first end W41 of the 3rd vice-side winding 310 and the second end W42, the first end W51 of the 4th vice-side winding 312 and the second end W52 is low level simultaneously, accordingly, first output DRVA, second output DRVB, 3rd output DRVD1, 4th output DRVD2 exports as low level, and then drive the upper pipe of double tube positive exciting converting network and lower pipe, rectifying tube and the continued flow tube of synchronous rectification converting network all end, so just can, before the rectifying tube conducting of synchronous rectification converting network, make the continued flow tube of synchronous rectification converting network guarantee to turn off, achieve and open time delay between the rectifying tube of synchronous rectification converting network and continued flow tube.
(3) when the first drive end DRV1 is input as low level, when second drive end DRV2 is input as high level, second triode Q2, 3rd triode Q3 conducting, first triode Q1, 4th triode Q4 ends, the first end W11 of former limit winding 307 is made to be low level, second end W12 is high level, so the first end W21 of the first vice-side winding 305, the first end W31 of the second vice-side winding 302, the first end W41 of the 3rd vice-side winding 310 and the second end W52 of the 4th vice-side winding 312 is low level simultaneously, second end W22 of the first vice-side winding 305, second end W32 of the second vice-side winding 302, second end W42 of the 3rd the vice-side winding 310 and first end W51 of the 4th vice-side winding 312 is high level simultaneously, accordingly, first output DRVA, second output DRVB, 3rd output DRVD1 exports as low level, 4th output DRVD2 exports as high level, and then drive the upper pipe of double tube positive exciting converting network and lower pipe, the rectifying tube cut-off of synchronous rectification converting network, drive the continued flow tube conducting of synchronous rectification converting network, power supply secondary afterflow inductance provides energy to output.
(4) as the first drive end DRV1, when second drive end DRV2 input is all low level again, second triode Q2, 4th triode Q4 conducting, first triode Q1, 3rd triode Q3 ends, the former limit winding two-terminal-grounding of transformer, so the first end W21 of the first vice-side winding 305 and the second end W22, the first end W31 of the second vice-side winding 302 and the second end W32, the first end W41 of the 3rd vice-side winding 310 and the second end W42, the first end W51 of the 4th vice-side winding 312 and the second end W52 is low level simultaneously, accordingly, first output DRVA, second output DRVB, 3rd output DRVD1, 4th output DRVD2 exports as low level, and then drive the upper pipe of double tube positive exciting converting network and lower pipe, rectifying tube and the continued flow tube of synchronous rectification converting network all end, so just can, before the continued flow tube conducting of synchronous rectification converting network, make the rectifying tube of synchronous rectification converting network guarantee to turn off, achieve the turn off delay time between the rectifying tube of synchronous rectification converting network and continued flow tube.
What above 4 operating states ensure that the rectifying tube of synchronous rectification converting network and continued flow tube opens dead band, and power good is reliably worked.
See Fig. 7, it is the structural representation of the 3rd embodiment of drive unit provided by the invention.
The drive unit that the present embodiment provides, compared with the first above-mentioned embodiment, its difference is:
Described first adjustment unit comprises the first field effect transistor Q11 and the second field effect transistor Q12, first field effect transistor Q11 is N channel-type, the drain electrode access direct voltage of the first field effect transistor Q11, second field effect transistor Q12 is P channel-type, the grounded drain of the second field effect transistor Q12, the grid of the first field effect transistor Q11 and the grid of the second field effect transistor Q12 are connected to the first drive end DRV1 jointly, and the source electrode of the first field effect transistor Q11 and the source electrode of the second field effect transistor Q12 are connected to the first end W11 of the former limit winding 307 of transformer T301 jointly;
Described second adjustment unit comprises the 3rd field effect transistor Q13 and the 4th field effect transistor Q14,3rd field effect transistor Q13 is N channel-type, the drain electrode access direct voltage of the 3rd field effect transistor Q13,4th field effect transistor Q14 is P channel-type, the grounded drain of the 4th field effect transistor Q14, the grid of the 3rd field effect transistor Q13 and the grid of the 4th field effect transistor Q14 are connected to the second drive end DRV2 jointly, and the source electrode of the 3rd field effect transistor Q13 and the source electrode of the 4th field effect transistor Q14 are connected to the second end W12 of the former limit winding 307 of transformer T301 jointly.
Further, described signal adjustment circuit also comprises the first resistance R1, the second resistance R2, electric capacity C1, the first diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4; The grid of described first field effect transistor Q11 and the grid of the second field effect transistor Q12 are connected to described first drive end DRV1 jointly by the first resistance R1; The grid of described 3rd field effect transistor Q13 and the grid of the 4th field effect transistor Q14 are connected to described second drive end DRV2 jointly by the second resistance R2; The source electrode of described first field effect transistor Q11 and the source electrode of the second field effect transistor Q12 are connected to the first end W11 of the former limit winding 307 of described transformer T301 jointly by described electric capacity C1; The anode of described first diode D1 is connected with the former limit winding 307 of described transformer, and the negative electrode of described first diode D1 is connected with the source electrode of described first field effect transistor Q11; The plus earth of described second diode D2, the negative electrode of described second diode D2 is connected with the source electrode of described first field effect transistor Q11; The plus earth of described 3rd diode D3, the negative electrode of described 3rd diode D3 is connected with the source electrode of described 3rd field effect transistor Q13; The plus earth of described 4th diode D4, the negative electrode of described 4th diode D4 is connected with the source electrode of described 3rd field effect transistor Q13.
The operation principle of the present embodiment is identical with the second above-mentioned embodiment, does not repeat them here.
It should be noted that, in the drive unit that above-described embodiment provides, four switching tubes are only described for triode, field effect transistor respectively, can also replace with IGBT, thyristor etc. three side controller part or its derive from device;
See Fig. 8, it is the schematic flow sheet of an embodiment of driving method provided by the invention.
A kind of driving method that the embodiment of the present invention provides, is applicable to the double tube positive exciting converting network and the synchronous rectification converting network that drive double tube positive exciting circuit of synchronous rectification, comprises step S301 to S303, specific as follows:
S301, receive complementary PWM input signal with Dead Time;
S302, signal transacting is carried out to described complementary PWM input signal after, obtain the 3rd drive singal, the four-wheel drive signal that are respectively used to drive the first drive singal of described double tube positive exciting converting network, the second drive singal and drive described synchronous rectification converting network; Wherein, described first drive singal and described second drive singal are in-phase signal, and described 3rd drive singal and described four-wheel drive signal are the complementary PWM output signal with Dead Time;
S303, described first drive singal, described second drive singal, described 3rd drive singal and described four-wheel drive signal to be exported.
See Fig. 9, it is the schematic flow sheet of another embodiment of driving method provided by the invention.
A kind of driving method that the embodiment of the present invention provides, comprises step S401 to S404, specific as follows:
S401, receive complementary PWM input signal with Dead Time;
S402, corresponding enhancing process is carried out to described complementary PWM input signal;
S403, to strengthen after described complementary PWM input signal carry out signal transacting after, obtain the 3rd drive singal, the four-wheel drive signal that are respectively used to drive the first drive singal of described double tube positive exciting converting network, the second drive singal and drive described synchronous rectification converting network.
S404, described first drive singal, described second drive singal, described 3rd drive singal and described four-wheel drive signal to be exported.
The drive unit that the embodiment of the present invention provides and method, be added on the former limit winding of transformer after complementary PWM input signal with Dead Time is strengthened process, by the mutual inductance principle of transformer, the drive singal of four field effect transistor double tube positive exciting circuit of synchronous rectification is exported respectively from the drive singal output of connection transformer vice-side winding, overcome in prior art and need additionally to increase delay circuit, the problem of negater circuit and a driving transformer, and the drive circuit of four switching tubes in double tube positive exciting circuit of synchronous rectification is incorporated in a circuit, simplify circuit to the utmost, reduce costs, improve reliability, drive singal due to secondary rectifying tube is no longer taken from main transformer and is exported winding, when electric power output voltage is higher, also drive circuit loss can not be caused very large, and then the synchronous rectification of high output voltage equipment can be realized, enhance compatibility and the efficiency of product, the drive singal that two outputs connecting the rectifying tube of described synchronous rectification converting network and continued flow tube export is the complementary PWM output signal with Dead Time, make the rectifying tube of synchronous rectification converting network and continued flow tube can not conducting simultaneously, can not only realize opening time delay between secondary synchronous rectifier and continued flow tube, can also turn off delay time be realized, improve the stability of product.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvement and distortion, these improve and distortion is also considered as protection scope of the present invention.
Claims (12)
1. a drive unit, is characterized in that, described drive unit comprises the first drive end, the second drive end, drive circuit, the first output, the second output, the 3rd output and the 4th output;
By the complementary PWM input signal with Dead Time that described first drive end and described second drive end input, carry out after signal transacting through described drive circuit, obtain the 3rd drive singal, the four-wheel drive signal that are respectively used to drive the first drive singal of described double tube positive exciting converting network, the second drive singal and drive described synchronous rectification converting network;
Described first drive singal, described second drive singal, described 3rd drive singal and described four-wheel drive signal export respectively by described first output, described second output, described 3rd output and described 4th output simultaneously; Wherein, described first drive singal and described second drive singal are in-phase signal, and described 3rd drive singal and described four-wheel drive signal are the complementary PWM output signal with Dead Time.
2. drive unit as claimed in claim 1, it is characterized in that, described drive circuit comprises transformer;
Described transformer comprises former limit winding, the first vice-side winding, the second vice-side winding, the 3rd vice-side winding and the 4th vice-side winding;
Described first drive end and described second drive end are connected with the first end of the former limit winding of described transformer and the second end respectively; Described first output is connected with the first end of described first vice-side winding, described second output is connected with the first end of described second vice-side winding, described 3rd output is connected with the first end of described 3rd vice-side winding, and described 4th output is connected with the first end of described 4th vice-side winding;
The first end of the first end of described first vice-side winding, the first end of described second vice-side winding, described 3rd vice-side winding and the first end of described former limit winding are Same Name of Ends, and the first end of described 4th vice-side winding and the first end of described former limit winding are not Same Name of Ends.
3. drive unit as claimed in claim 2, it is characterized in that, described drive unit also comprises signal adjustment circuit, and described signal adjustment circuit receives described complementary PWM input signal, and sends to described drive circuit after described complementary PWM input signal being carried out corresponding enhancing process;
Described first drive end and described second drive end are connected with the first end of the former limit winding of described transformer and the second end respectively by described signal adjustment circuit.
4. drive unit as claimed in claim 3, it is characterized in that, described signal adjustment circuit comprises the first adjustment unit and the second adjustment unit;
Described first adjustment unit comprises the first switching tube and second switch pipe, the common port access direct voltage of the first switching tube, the common end grounding of second switch pipe, the control end of the first switching tube and the control end of second switch pipe are connected to the first drive end jointly, and the output of the first switching tube and the output of second switch pipe are connected to the first end of the former limit winding of described transformer jointly;
Described second adjustment unit comprises the 3rd switching tube and the 4th switching tube, the common port access direct voltage of the 3rd switching tube, the common end grounding of the 4th switching tube, the control end of the 3rd switching tube and the control end of the 4th switching tube are connected to the second drive end jointly, and the output of the 3rd switching tube and the output of the 4th switching tube are connected to the second end of the former limit winding of described transformer jointly;
Described complementary PWM input signal controls described first switching tube, described second switch pipe, described 3rd switching tube and described 4th switching tube and is operated in conducting state or cut-off state.
5. drive unit as claimed in claim 4, it is characterized in that, described signal adjustment circuit also comprises the first resistance, the second resistance, electric capacity, the first diode, the second diode, the 3rd diode and the 4th diode;
The control end of described first switching tube and the control end of described second switch pipe are connected to described first drive end jointly by described first resistance;
The control end of described 3rd switching tube and the control end of described 4th switching tube are connected to described second drive end jointly by described second resistance;
The output of described first switching tube and the output of described second switch pipe are connected to the first end of the former limit winding of described transformer jointly by described electric capacity;
The anode of described first diode is connected with the first end of the former limit winding of described transformer, and the negative electrode of described first diode is connected with the output of described first switching tube;
The plus earth of described second diode, the negative electrode of described second diode is connected with the output of described first switching tube;
The plus earth of described 3rd diode, the negative electrode of described 3rd diode is connected with the output of described 3rd switching tube;
The plus earth of described 4th diode, the negative electrode of described 4th diode is connected with the output of described 3rd switching tube.
6. drive unit as claimed in claim 2, it is characterized in that, described drive circuit also comprises the 3rd resistance, the 4th resistance, the 5th resistance and the 6th resistance;
Described first output is connected with the first end of described first vice-side winding by described 3rd resistance, described second output is connected with the first end of described second vice-side winding by described 4th resistance, described 3rd output is connected with the first end of described 3rd vice-side winding by described 5th resistance, and described 4th output is connected with the first end of described 4th vice-side winding by described 6th resistance.
7. drive unit as claimed in claim 4, it is characterized in that, described first switching tube is the first triode, described second switch pipe is the second triode, first triode is NPN type, the collector electrode access direct voltage of the first triode, second triode is positive-negative-positive, the grounded collector of the second triode, the base stage of the first triode and the base stage of the second triode are connected to the first drive end jointly, and the emitter of the first triode and the emitter of the second triode are connected to the first end of the former limit winding of transformer jointly;
Described 3rd switching tube is the 3rd triode, described 4th switching tube is the 4th triode, 3rd triode is NPN type, the collector electrode access direct voltage of the 3rd triode, 4th triode is positive-negative-positive, the grounded collector of the 4th triode, the base stage of the 3rd triode (Q3) and the base stage of the 4th triode are connected to the second drive end jointly, and the emitter of the 3rd triode and the emitter of the 4th triode are connected to the second end of the former limit winding of transformer jointly.
8. drive unit as claimed in claim 7, it is characterized in that, described signal adjustment circuit also comprises the first resistance, the second resistance, electric capacity, the first diode, the second diode, the 3rd diode and the 4th diode;
The base stage of described first triode and the base stage of the second triode are connected to described first drive end jointly by the first resistance;
The base stage of described 3rd triode and the base stage of the 4th triode are connected to described second drive end jointly by the second resistance;
The emitter of described first triode and the emitter of the second triode are connected to the first end of the former limit winding of described transformer (T301) jointly by described electric capacity;
The anode of described first diode is connected with the former limit winding 307 of described transformer, and the negative electrode of described first diode is connected with the emitter of described first triode;
The plus earth of described second diode, the negative electrode of described second diode is connected with the emitter of described first triode;
The plus earth of described 3rd diode, the negative electrode of described 3rd diode is connected with the emitter of described 3rd triode;
The plus earth of described 4th diode, the negative electrode of described 4th diode is connected with the emitter of described 3rd triode.
9. drive unit as claimed in claim 4, it is characterized in that, described first switching tube is the first field effect transistor, described second switch pipe is the second field effect transistor, first field effect transistor is N channel-type, the drain electrode access direct voltage of the first field effect transistor, second field effect transistor is P channel-type, the grounded drain of the second field effect transistor, the grid of the first field effect transistor and the grid of the second field effect transistor are connected to the first drive end jointly, and the source electrode of the first field effect transistor and the source electrode of the second field effect transistor are connected to the first end of the former limit winding of transformer jointly;
Described 3rd switching tube is the 3rd field effect transistor, described 4th switching tube is the 4th field effect transistor, 3rd field effect transistor is N channel-type, the drain electrode access direct voltage of the 3rd field effect transistor, 4th field effect transistor is P channel-type, the grounded drain of the 4th field effect transistor, the grid of the 3rd field effect transistor and the grid of the 4th field effect transistor are connected to the second drive end jointly, and the source electrode of the 3rd field effect transistor and the source electrode of the 4th field effect transistor are connected to the second end of the former limit winding 307 of transformer jointly.
10. drive unit as claimed in claim 9, it is characterized in that, described signal adjustment circuit also comprises the first resistance (R1), the second resistance, electric capacity, the first diode, the second diode, the 3rd diode and the 4th diode;
The grid of described first field effect transistor and the grid of the second field effect transistor are connected to described first drive end jointly by the first resistance;
The grid of described 3rd field effect transistor and the grid of the 4th field effect transistor are connected to described second drive end jointly by the second resistance;
The source electrode of described first field effect transistor and the source electrode of the second field effect transistor are connected to the first end of the former limit winding of described transformer jointly by described electric capacity;
The anode of described first diode and the former limit winding switching of described transformer, the negative electrode of described first diode is connected with the source electrode of described first field effect transistor;
The plus earth of described second diode, the negative electrode of described second diode is connected with the source electrode of described first field effect transistor;
The plus earth of described 3rd diode, the negative electrode of described 3rd diode is connected with the source electrode of described 3rd field effect transistor;
The plus earth of described 4th diode, the negative electrode of described 4th diode is connected with the source electrode of described 3rd field effect transistor.
11. 1 kinds of driving methods, is characterized in that, comprise step:
Receive the complementary PWM input signal with Dead Time;
After signal transacting is carried out to described complementary PWM input signal, obtain the 3rd drive singal, the four-wheel drive signal that are respectively used to drive the first drive singal of described double tube positive exciting converting network, the second drive singal and drive described synchronous rectification converting network; Wherein, described first drive singal and described second drive singal are in-phase signal, and described 3rd drive singal and described four-wheel drive signal are the complementary PWM output signal with Dead Time;
Described first drive singal, described second drive singal, described 3rd drive singal and described four-wheel drive signal are exported.
12. driving methods as claimed in claim 11, is characterized in that, also comprise after the complementary PWM input signal of described reception with Dead Time:
Corresponding enhancing process is carried out to described complementary PWM input signal;
Described signal transacting is carried out to described complementary PWM input signal after, the 3rd drive singal obtaining being respectively used to drive the first drive singal of described double tube positive exciting converting network, the second drive singal and drive described synchronous rectification converting network, four-wheel drive signal specifically comprise: after carrying out signal transacting to the described complementary PWM input signal after strengthening, obtain the 3rd drive singal, the four-wheel drive signal that are respectively used to drive the first drive singal of described double tube positive exciting converting network, the second drive singal and drive described synchronous rectification converting network.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410856173.3A CN104467380B (en) | 2014-12-31 | Driving device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410856173.3A CN104467380B (en) | 2014-12-31 | Driving device and method |
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| CN104467380A true CN104467380A (en) | 2015-03-25 |
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