CN103795229A - Drive circuit of double-tube forward synchronous rectification circuit - Google Patents
Drive circuit of double-tube forward synchronous rectification circuit Download PDFInfo
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- CN103795229A CN103795229A CN201410038844.5A CN201410038844A CN103795229A CN 103795229 A CN103795229 A CN 103795229A CN 201410038844 A CN201410038844 A CN 201410038844A CN 103795229 A CN103795229 A CN 103795229A
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Abstract
The embodiment of the invention discloses a driving circuit of a double-tube forward synchronous rectification circuit, which comprises a double-tube forward conversion network at the primary side of a transformer and a synchronous rectification conversion network at the secondary side of the transformer, wherein the driving circuit of the double-tube forward synchronous rectification circuit comprises a double-tube driving circuit for driving the double-tube forward conversion network and a follow current tube driving circuit for driving the synchronous rectification conversion network, the double-tube driving circuit comprises an adjusting circuit for adjusting the turn-on time of an input signal of the double-tube driving circuit, and/or the follow current tube driving circuit comprises a self-locking discharge circuit for quickly releasing the current in a follow current tube in the synchronous rectification conversion network. The invention can realize the dead zone adjustment of the drive of the rectifier tube and the follow current tube and simultaneously realize the quick turn-off of the synchronous follow current tube.
Description
Technical field
The present invention relates to a kind of drive circuit, relate in particular to a kind of drive circuit of double tube positive exciting circuit of synchronous rectification.
Background technology
Current professional LED display and LED illumination has become main flow, and particularly product has moved towards internationalization in recent years, and the aspect such as efficiency and environment for use requirement of quality to product, power density, power supply is also more harsh.Along with the enforcement of new national standard, prominent domestic LED display manufacturer also will be in each side such as power-efficient, ultra-thin, environment, especially pay close attention to.
For this reason, the product of high efficiency, ultra-thin, small size, low middle power is current LED power supply main product.In order to raise the efficiency, conventionally select the topology (LLC half-bridge resonance, asymmetrical half-bridge, double tube positive exciting) of soft switch to add output synchronous rectification (self-powered synchronous rectification, the synchronous rectification of IC control chip, it drive formula synchronous rectification) mode.
Use output 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, in the time that rectifying tube is opened, afterflow does not also enter off state, at this moment the phenomenon of two pipe conductings 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 prior art double tube positive exciting synchronous rectification topological circuit schematic diagram.As shown in Figure 1, its limit, Central Plains is double tube positive exciting converting network, and secondary is synchronous rectification converting network.Former limit Q300, Q302, D300, D302 have formed double tube positive exciting topological structure; VBulk is AC rectification filtering voltage interface; DRVA, DRVAA are that upper pipe driving, DRVB, CS are that lower pipe drives.Secondary Q403, Q401, LB400, EC400, EC401 composition MOSFET synchronous rectification network; Synchronous rectifier Q403 drives and adopts the self-driven mode of main transformer TB1 to supply with; 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 the two-tube drive circuit schematic diagram of prior art.
Wherein DRV provides pwm signal by control chip, and being divided into two identical windings by driving isolation transformer T300A again through the totem drive circuit of R305, DB300, Q301, Q304 composition provides identical driving signal to master power switch pipe Q300, the Q302 of double tube positive exciting;
Fig. 3 is prior art continued flow tube drive circuit schematic diagram.
DRV provides pwm signal by control chip, offer after carrying out oppositely to pwm signal through R327, RC301, C307, Q312, composition, the totem drive circuit of RC300, Q309, Q310, composition provides driving signal by driving isolation transformer T301A secondary winding to continued flow switch pipe Q401 again.
The shortcoming that prior art exists mainly contains:
1, can not carry out the dead band adjustment of the driving of rectifying tube and continued flow tube, the common phenomenon of the meeting uncontrollable rectifying tube of random time of occurrence and continued flow tube in the situations such as year start of output band or dynamic load, output short-circuit, cause Efficiency Decreasing, when serious, can make the short circuit in winding of secondary, damage main switch or output synchronous rectifier.
2, the shutoff of continued flow tube is carried out in the load that utilizes secondary winding oppositely to produce, and turn-off speed is slow, has serious potential safety hazard.
Summary of the invention
Embodiment of the present invention technical problem to be solved is, a kind of drive circuit of double tube positive exciting circuit of synchronous rectification is provided.Can the Dead Time of the driving of rectifying tube and continued flow tube be adjusted and be arranged, and can turn-off fast the continued flow tube of output.
In order to solve the problems of the technologies described above, the embodiment of the present invention provides a kind of drive circuit of double tube positive exciting circuit of synchronous rectification, described double tube positive exciting circuit of synchronous rectification comprises the double tube positive exciting converting network in transformer primary side and the synchronous rectification converting network in transformer secondary, the drive circuit of described double tube positive exciting circuit of synchronous rectification comprises two-tube drive circuit for driving described double tube positive exciting converting network and for driving the continued flow tube drive circuit of described synchronous rectification converting network, described two-tube drive circuit comprises the Circuit tuning of the input signal service time for adjusting described two-tube drive circuit, and/or described continued flow tube drive circuit comprises the self-locking discharge circuit for discharging fast electric current in described synchronous rectification converting network continued flow tube.
Further, the pwm signal of the input signal of described two-tube drive circuit for being provided by control chip, described service time refers to the time that the rising edge of described pwm signal starts.
Further, described two-tube drive circuit comprises the first totem drive circuit, the first driving isolation transformer; The input signal of described two-tube drive circuit is inputted the first totem drive circuit after the adjustment of described Circuit tuning, then by described the first driving isolation transformer, and by the secondary winding output signal of described transformer, for described double tube positive exciting converting network provides driving signal.
Further, described double tube positive exciting converting network comprises two master power switch pipes, and the input signal of described two-tube drive circuit, after described the first driving isolation transformer, is divided into two identical windings, is respectively described master power switch pipe driving signal is provided.
Further, described Circuit tuning comprises the first electric capacity, the first resistance and the first triode; Need controlled signal to input described Circuit tuning by one end of described the first electric capacity, the other end of described the first electric capacity is by described the first grounding through resistance, the base stage of described the first triode is connected between described the first electric capacity and the first resistance, the emitter grounding of described the first triode, the collector electrode of described the first triode is connected with rear one-level circuit, one-level circuit after the signal after described Circuit tuning adjustment is passed to by the collector electrode of described the first triode.
Further, described the first triode is NPN type triode.
Further, described continued flow tube drive circuit adopts the pwm signal of described control chip output as input signal.
Further, described continued flow tube drive circuit comprises negater circuit, the second totem drive circuit, the second driving isolation transformer; The input signal of described continued flow tube drive circuit is after described negater circuit is reverse, through described the second totem drive circuit, again by described the second driving isolation transformer, provide driving signal finally by crossing described self-locking discharge circuit for the continued flow tube in described synchronous rectification converting network.
Further, described self-locking discharge circuit comprises the second triode, the 3rd triode, the first diode, the second resistance, the emitter-base bandgap grading of described the second triode as the input of described self-locking discharge circuit to receive signal, the collector electrode of described the second triode connects the base stage of described the 3rd triode, the emitter grounding of described the 3rd triode, the emitter-base bandgap grading of described the 3rd triode connects the base stage of described the 3rd triode by described the first diode, for positive conducting voltage between described the 3rd transistor base and emitter-base bandgap grading is provided, the collector electrode of described the 3rd triode connects the base stage of described the second triode, the base stage of described the second triode connects the emitter-base bandgap grading of described the second triode by described the second resistance, the emitter-base bandgap grading of described the second triode is as the output of described continued flow tube drive circuit.
Further, described the second triode is positive-negative-positive triode, and described the 3rd triode is NPN type triode.
Implement the embodiment of the present invention, there is following beneficial effect:
1, the time that the present invention starts with the pwm signal rising edge of simple RC device adjustment input, thereby the Dead Time of the driving of capable of regulating rectification pipe and continued flow tube.
2, realize the quick shutoff of continued flow tube.
3, the common phenomenon of synchronous rectification reduces.
4, synchronous rectification switch loss reduces.
5, reduce between synchronous rectifier and synchronous freewheeling pipe because of common cause unstable.
6, the efficiency of the double tube positive exciting circuit of synchronous rectification of entirety gets a promotion.
7, the present invention's scheme compared to existing technology, the scope of application is wider.
Accompanying drawing explanation
Fig. 1 is prior art double tube positive exciting synchronous rectification topological circuit schematic diagram;
Fig. 2 is the two-tube drive circuit schematic diagram of prior art;
Fig. 3 is prior art continued flow tube drive circuit schematic diagram;
Fig. 4 is the two-tube drive circuit schematic diagram of the present invention;
Fig. 5 is continued flow tube drive circuit schematic diagram of the present invention;
Fig. 6 is the drive circuit schematic diagram of double tube positive exciting circuit of synchronous rectification of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, the present invention is described in further detail.
Drive circuit of the present invention is applicable to double tube positive exciting circuit of synchronous rectification, and described double tube positive exciting circuit of synchronous rectification comprises the double tube positive exciting converting network in transformer primary side and the synchronous rectification converting network in transformer secondary.The drive circuit of double tube positive exciting circuit of synchronous rectification of the present invention comprises two-tube drive circuit for driving described double tube positive exciting converting network and for driving the continued flow tube drive circuit of described synchronous rectification converting network continued flow tube.
Fig. 4 is the two-tube drive circuit schematic diagram of the present invention.As shown in the figure, the pwm signal being provided by control chip is as the described two-tube drive circuit of input signal DRV access.Described input signal first through formed by the first capacitor C 1, the first resistance R 1 and the first triode Q1 for adjust input the pwm signal rising edge time started Circuit tuning, the first totem drive circuit through being formed by resistance R 305, diode DB300, triode Q301 and triode Q304 again, then be divided into two identical windings by described the first driving isolation transformer T1, provide driving signal for the master power switch pipe of giving double tube positive exciting synchronous rectification topology double tube positive exciting shown in Fig. 1.Concrete, wherein the DRVA in circuit and DRVAA shown in Fig. 4 provide driving signal for the upper pipe Q300 of limit, Fig. 1 Central Plains double tube positive exciting circuit, and the DRVB shown in Fig. 4 in circuit and CS provide driving signal for the lower pipe Q302 of limit, Fig. 1 Central Plains double tube positive exciting circuit.
The input signal of described two-tube drive circuit, the concrete annexation of described Circuit tuning and described totem-pote circuit is as follows: described totem drive circuit is by resistance R 305, diode DB300, triode Q301 and triode Q304 composition, described input signal is sent into the base stage of triode Q301 and triode Q304 after the circuit being made up of described resistance R 305 and described diode DB300 parallel connection, the collector electrode of described triode Q301 is connected to power supply VCC by a resistance, the emitter-base bandgap grading of triode Q301 connects the emitter-base bandgap grading of described triode Q304, the grounded collector of described triode Q304.Described Circuit tuning is made up of the first triode Q1 of the first capacitor C 1, the first resistance R 1 and NPN type, one end of described the first electric capacity receives the pwm signal of being exported by control chip, the other end connects respectively one end of described the first resistance R 1 and the base stage of described the first triode Q1, all ground connection of emitter-base bandgap grading of described the first resistance and described the first triode Q1, the collector electrode of described the first triode Q1 connects the base stage of the described triode Q304 of described totem-pote circuit.By such mode, the input signal of adjusted rise time is delivered to next stage circuit by described Circuit tuning.Wherein, the described rise time refers to the time that pwm signal rising edge starts.
By adding the Circuit tuning being formed by the first capacitor C 1, the first resistance R 1 and the first triode Q1 in conventional in the prior art two-tube drive circuit, can adjust the rise time of the pwm signal of inputting described two-tube drive circuit, thereby the Dead Time of the driving of realization to rectifying tube and continued flow tube is adjusted.The principle that realizes this function is as follows:
First pulse of described input signal PWM is risen while coming, due to the existence of described the first capacitor C 1, signal is added in described the first resistance R 1, in the time that pulse voltage value reaches the turn-on threshold of described the first triode Q1, described the first triode Q1 conducting, described input signal PWM imports the earth by described the first triode Q1, and therefore described pwm signal does not access rear class totem-pote circuit.Along with described the first capacitor C 1 is full of after electricity, described the first triode Q1 enters again cut-off state, and described input signal PWM inputs in totem-pote circuit normally.Like this, just there is a time difference importing the moment of described two-tube drive circuit into and be passed between moment of master power switch pipe of double tube positive exciting circuit in the rise time of input pwm signal.That is to say, rectifying tube drives with the conducting of continued flow tube driving and on the time of shutoff and has the described time difference.By regulating the parameter of described the first capacitor C 1, the first resistance R 1 and the first triode Q1, can adjust described time extent simultaneously, avoid the common of rectifying tube and continued flow tube in described double tube positive exciting circuit of synchronous rectification.The two-tube drive circuit of prior art as shown in Figure 2 does not have this adjustable time difference.
Should be understood that; spirit of the present invention is to utilize simple resistance, electric capacity, the realization of triode original paper to adjust the pwm signal rise time of input; and then being delivered to next stage circuit, protection scope of the present invention should not be subject to the restriction of totem-pote circuit structure described above.
Fig. 5 is continued flow tube drive circuit schematic diagram of the present invention.The pwm signal being provided by control chip is inputted described continued flow tube drive circuit as input signal DRV, through the negater circuit that formed by R327, RC301, C307, Q312 oppositely after, again through described the second totem drive circuit being formed by RC300, Q309, Q310, then pass through described the second driving isolation transformer T2 secondary winding, finally by crossing by the second triode Q2, the 3rd triode Q3, the first diode D1, the self-locking discharge circuit that the second resistance R 2 forms provides driving signal for the continued flow tube in described synchronous rectification converting network.Concrete, the DRVD2 shown in Fig. 5 in circuit provides driving signal for the continued flow switch pipe Q401 in secondary synchronous rectification converting network in Fig. 1.
Described self-locking discharge circuit comprises positive-negative-positive the second triode Q2, NPN type the 3rd triode Q3, the second resistance R 2, the first diode D1, the emitter-base bandgap grading of described the second triode Q2 as the input of described self-locking discharge circuit to receive signal, the collector electrode of described the second triode Q2 connects the base stage of described the 3rd triode Q3, the emitter grounding of described the 3rd triode Q3, the emitter-base bandgap grading of described the 3rd triode Q3 connects the base stage of described the 3rd triode Q3 by described the first diode D1, for positive conducting voltage between described the 3rd triode Q3 base stage and emitter-base bandgap grading is provided, the collector electrode of described the 3rd triode Q3 connects the base stage of described the second triode, the base stage of described the second triode Q2 connects the emitter-base bandgap grading of described the second triode Q2 by described the second resistance R 2, the emitter-base bandgap grading of described the second triode Q2 is used to the continued flow switch pipe Q401 in secondary synchronous rectification converting network in Fig. 1 that driving signal is provided as the output of described continued flow tube drive circuit.
By adding in conventional in the prior art continued flow tube drive circuit by the second triode Q2, the 3rd triode Q3, the second resistance R 2, the self-locking discharge circuit that the first diode D1 forms, can make the grid of described continued flow switch pipe Q401 and the electric charge of source electrode thoroughly release, thereby realize the described continued flow switch pipe of the shutoff Q401 of fast and reliable.The principle that realizes this function is as follows:
Input signal is delivered to secondary by isolating transformer T2, in the time bearing just down on the voltage on secondary coil, the pwm signal of input is directly exported to described continued flow tube Q401 by capacitor C 409, resistance R 427, the VBE of the VBE of described the 3rd triode Q3 in reverse voltage, described the second triode Q2 is in forward voltage, and now described the 3rd triode Q3 and described the second triode Q2 are in cut-off state; When negative lower timing on the voltage on secondary coil is due to the existence of the first diode D1, the VBE of described the 3rd triode Q3 have positive 0.7V conducting voltage can, described the 3rd triode Q3 and the second triode Q2 have formed an interactive self-locking mode.Opening of described the 3rd triode Q3 makes described the second triode Q2 along with open-minded, and the electric charge of faster continued flow tube grid and source electrode being deposited bleeds off fast, reaches quick closedown.And the continued flow tube drive circuit of prior art is that the negative pressure of utilizing secondary winding oppositely to produce is turn-offed, the speed that this mode continued flow tube is closed is slower.
To sum up, the present invention includes two-tube drive circuit and the two-part double tube positive exciting circuit of synchronous rectification of continued flow tube rectification circuit as shown in Figure 6.
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 improvements and modifications, these improvements and modifications are also considered as protection scope of the present invention.
Claims (10)
1. the drive circuit of a double tube positive exciting circuit of synchronous rectification, described double tube positive exciting circuit of synchronous rectification comprises the double tube positive exciting converting network in transformer primary side and the synchronous rectification converting network in transformer secondary, the drive circuit of described double tube positive exciting circuit of synchronous rectification comprises two-tube drive circuit for driving described double tube positive exciting converting network and for driving the continued flow tube drive circuit of described synchronous rectification converting network, it is characterized in that, described two-tube drive circuit comprises the Circuit tuning of the input signal service time for adjusting described two-tube drive circuit, and/or described continued flow tube drive circuit comprises the self-locking discharge circuit for discharging fast electric current in described synchronous rectification converting network continued flow tube.
2. drive circuit according to claim 1, is characterized in that, the pwm signal of the input signal of described two-tube drive circuit for being provided by control chip, and described service time refers to the time that the rising edge of described pwm signal starts.
3. drive circuit according to claim 1, is characterized in that, described two-tube drive circuit comprises the first totem drive circuit, the first driving isolation transformer; The input signal of described two-tube drive circuit is inputted the first totem drive circuit after the adjustment of described Circuit tuning, then by described the first driving isolation transformer, and by the secondary winding output signal of described transformer, for described double tube positive exciting converting network provides driving signal.
4. drive circuit according to claim 3, it is characterized in that, described double tube positive exciting converting network comprises two master power switch pipes, the input signal of described two-tube drive circuit is after described the first driving isolation transformer, be divided into two identical windings, be respectively described master power switch pipe driving signal is provided.
5. drive circuit according to claim 1, is characterized in that, described Circuit tuning comprises the first electric capacity, the first resistance and the first triode; Need controlled signal to input described Circuit tuning by one end of described the first electric capacity, the other end of described the first electric capacity is by described the first grounding through resistance, the base stage of described the first triode is connected between described the first electric capacity and the first resistance, the emitter grounding of described the first triode, the collector electrode of described the first triode is connected with rear one-level circuit, one-level circuit after the signal after described Circuit tuning adjustment is passed to by the collector electrode of described the first triode.
6. drive circuit according to claim 5, is characterized in that, described the first triode is NPN type triode.
7. drive circuit according to claim 1, is characterized in that, described continued flow tube drive circuit adopts the pwm signal of described control chip output as input signal.
8. drive circuit according to claim 1, is characterized in that, described continued flow tube drive circuit comprises negater circuit, the second totem drive circuit, the second driving isolation transformer; The input signal of described continued flow tube drive circuit is after described negater circuit is reverse, through described the second totem drive circuit, again by described the second driving isolation transformer, provide driving signal finally by crossing described self-locking discharge circuit for the continued flow tube in described synchronous rectification converting network.
9. drive circuit according to claim 8, is characterized in that, described self-locking discharge circuit comprises the second triode, the 3rd triode, the first diode, the second resistance, the emitter-base bandgap grading of described the second triode as the input of described self-locking discharge circuit to receive signal, the collector electrode of described the second triode connects the base stage of described the 3rd triode, the emitter grounding of described the 3rd triode, the emitter-base bandgap grading of described the 3rd triode connects the base stage of described the 3rd triode by described the first diode, for positive conducting voltage between described the 3rd transistor base and emitter-base bandgap grading is provided, the collector electrode of described the 3rd triode connects the base stage of described the second triode, the base stage of described the second triode connects the emitter-base bandgap grading of described the second triode by described the second resistance, the emitter-base bandgap grading of described the second triode is as the output of described continued flow tube drive circuit.
10. drive circuit according to claim 9, is characterized in that, described the second triode is positive-negative-positive triode, and described the 3rd triode is NPN type triode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410038844.5A CN103795229B (en) | 2014-01-26 | 2014-01-26 | Drive circuit of double-tube forward synchronous rectification circuit |
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| CN201410038844.5A CN103795229B (en) | 2014-01-26 | 2014-01-26 | Drive circuit of double-tube forward synchronous rectification circuit |
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| CN107453595A (en) * | 2017-08-17 | 2017-12-08 | 国家电网公司 | Series IGBT sync control device based on synchro source technology |
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| CN110474539A (en) * | 2019-08-23 | 2019-11-19 | 佛山市格正电源科技有限公司 | A kind of novel isolated drive circuit |
| CN114123758A (en) * | 2021-11-29 | 2022-03-01 | 珠海格力电器股份有限公司 | AC-DC converter and control method of AC-DC converter |
| CN117674606A (en) * | 2023-11-02 | 2024-03-08 | 山东航天电子技术研究所 | A nationally produced synchronous rectification and drive circuit suitable for GaN power devices |
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| CN104269997B (en) * | 2014-10-11 | 2017-09-26 | 南京航空航天大学 | A kind of adjustable transformer isolation complementary drive circuit in dead band |
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| TWI677178B (en) * | 2017-06-27 | 2019-11-11 | 全漢企業股份有限公司 | Rectifier and associated rectifying circuit |
| CN107196486A (en) * | 2017-07-13 | 2017-09-22 | 无锡市金赛德电子有限公司 | A kind of active and standby input power circuit |
| CN107453595A (en) * | 2017-08-17 | 2017-12-08 | 国家电网公司 | Series IGBT sync control device based on synchro source technology |
| CN107453595B (en) * | 2017-08-17 | 2019-07-02 | 国家电网公司 | Serial IGBT Synchronous Control Device Based on Synchronous Power Technology |
| CN108880202A (en) * | 2018-07-05 | 2018-11-23 | 广州视源电子科技股份有限公司 | Drive circuit and variable frequency power supply |
| CN110474539A (en) * | 2019-08-23 | 2019-11-19 | 佛山市格正电源科技有限公司 | A kind of novel isolated drive circuit |
| CN114123758A (en) * | 2021-11-29 | 2022-03-01 | 珠海格力电器股份有限公司 | AC-DC converter and control method of AC-DC converter |
| CN114123758B (en) * | 2021-11-29 | 2023-10-10 | 珠海格力电器股份有限公司 | AC-DC converter and control method for AC-DC converter |
| CN117674606A (en) * | 2023-11-02 | 2024-03-08 | 山东航天电子技术研究所 | A nationally produced synchronous rectification and drive circuit suitable for GaN power devices |
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