CN1316726C - Self-driving circuit of antilaser converter synchronous rectifier - Google Patents

Self-driving circuit of antilaser converter synchronous rectifier Download PDF

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Publication number
CN1316726C
CN1316726C CNB2004100596069A CN200410059606A CN1316726C CN 1316726 C CN1316726 C CN 1316726C CN B2004100596069 A CNB2004100596069 A CN B2004100596069A CN 200410059606 A CN200410059606 A CN 200410059606A CN 1316726 C CN1316726 C CN 1316726C
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power tube
winding
main power
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circuit
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CN1585249A (en
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刘亚
熊代富
华桂潮
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YIBO POWER SUPPLY (HANGZHOU) CO Ltd
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YIBO POWER SUPPLY (HANGZHOU) CO Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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Abstract

The present invention discloses a self-driving circuit of a synchronous rectifying tube of an anti-laser converter, which makes a converter have the advantages of small common conduction loss and easy realization of high power density and is suitable for the application occasions of primary side and secondary side high-voltage isolation. The self-driving circuit comprises a time delay driving circuit, an isolation differential circuit, a switching-off and triggering circuit of a synchronous rectifying tube, and a self-locking and driving maintaining circuit of the synchronous rectifying tube, wherein the time delay driving circuit transmits PWM signals to a gate pole of a main power tube after delaying the PWM signals; the isolation differential circuit inputs the PWM signals and outputs a narrow pulse signal; the switching-off and triggering circuit of the synchronous rectifying tube receives the narrow pulse signal outputted by the isolation differential circuit and then switches off the synchronous rectifying tube; the self-locking and driving maintaining circuit of the synchronous rectifying tube comprises a drive winding as a second secondary side winding of a main transformer; the gate poles of all synchronous rectifying MOS tubes are limited at zero voltage when a main power tube is switched on ; the synchronous rectifying MOS tubes are kept in a conduction state when the main power tube is switched off.

Description

The self-driven circuit of reverse exciting converter synchronous rectifier
Technical field
The present invention relates to Switching Power Supply, specifically a kind of self-driven circuit of reverse exciting converter synchronous rectifier of novelty.
Background technology
Traditional anti exciting converter synchronous commutation self-driving circuit can not be controlled common conducting well, thereby can't obtain high efficiency.Traditional self-driven technology shown in Figure 1 is to adopt outside auxiliary winding Nb to drive synchronous rectifier S3.When bearing just down on S1 turn-offs, and secondary winding Ns, driving winding Nb voltage become, S3 is open-minded, and the energy of transformer secondary provides to load by S3; When S1 is open-minded, to go up the negative following positive process need time because of secondary winding Ns, Nb voltage become, thereby make S1 and the common conducting of S3, secondary is by short circuit.Although this time is very short, common conduction loss is still very big, will damage S1 and S3 when serious.Even operate as normal, but because of common conduction loss is very big, the efficient of converter can be very not high yet.
Fig. 2 (a) is depicted as the self-driven circuit of a kind of reverse exciting converter synchronous rectifier commonly used at present.This circuit comprises former limit power circuit, secondary circuit and self-driven circuit, described former limit circuit comprises main power MOSFET S1, the former limit of transformer winding Np, input end capacitor Cin, and described secondary circuit comprises transformer secondary winding Ns, rectifying tube S3 and output capacitor Co.Wherein, described self-driven circuit is made up of diode D2, capacitor C 2, resistance R 2, isolation drive transformer T2, capacitor C 1, resistance R 1 and a delay driving circuit, described delay driving circuit is made of delay circuit and drive circuit, wherein, an example of described delay circuit be by with diode with after resistance is in parallel, connect with ground capacity again and constitute.
When becoming when high by low from the pwm signal of control chip, pwm signal makes isolation drive transformer T2 through differential circuit R1C1 former limit winding Npp end of the same name is for just, thereby T2 secondary winding Nss voltage becomes and goes up negative down just (end of the same name for just) conducting D2 C2 is charged, synchronous rectifier S3 so be turned off.Pwm signal after delay circuit time-delay, open main power tube S1 with store energy in transformer T1.When pwm signal by hypermutation when low, the former limit winding Npp voltage of isolation drive transformer T2 becomes goes up negative down just (end of the same name is for negative), thereby T2 secondary winding Nss voltage is negative just down on becoming, synchronous rectifier S3 is therefore by open-minded.The energy that is stored among the transformer T1 offers load by secondary winding Ns and synchronous rectifier S3.Though this scheme has solved the shortcoming of scheme among Fig. 1, the efficient of converter is greatly improved, but this self-driven circuit is the whole PWM signal to be passed to secondary realize the shutoff of synchronous rectifier and open-minded, the isolation drive transformer needs transmitted power, what therefore, the volume of isolation drive transformer was difficult to do is very little.The occasion of isolating at the former secondary high pressure of needs and since safe distance requirement, the volume of isolation drive transformer will be bigger.Simultaneously, because the leakage inductance of driving transformer is very big, the drive waveforms that passes to secondary has very big due to voltage spikes, punctures the grid source electrode of synchronous rectifier possibly in this case.This just makes this self-driven circuit be difficult to realize high power density, and is not suitable for the occasion that former secondary needs high pressure to isolate.
Summary of the invention
To the objective of the invention is the problem that exists in the existing anti exciting converter self-driven technology commonly used in order solving, to provide a kind of and make the common conduction loss of converter little, high power density realizes easily, be applicable to the self-driven circuit of former secondary high pressure isolation applications occasion.
The self-driven circuit of reverse exciting converter synchronous rectifier of the present invention is realized by following proposal: its converter comprises main transformer, main power tube and synchronous rectifier, and wherein, described self-driven circuit comprises:
A delay driving circuit will be exported to the gate pole of main power tube after the pwm signal time-delay;
Isolate differential circuit for one, the input pwm signal is exported a narrow pulse signal;
A synchronous rectifier turn-offs circuits for triggering, receives the narrow pulse signal of self-isolation differential circuit output, and synchronous rectifier is turn-offed;
The self-locking of a synchronous rectifier and drive holding circuit, this circuit comprises a driving winding as the second secondary winding of main transformer, during main power tube is opened with the gate pole clamper of described synchronous rectifier in no-voltage; Keep described synchronous rectifier conducting at the main power tube blocking interval.
Described delay driving circuit is made of delay circuit and drive circuit, wherein, an example of described delay circuit be by with diode with after resistance is in parallel, connect with ground capacity again and constitute.
Described isolation differential circuit is made of transformer, an electric capacity, a resistance and a diode, and wherein, transformer comprises former limit winding and secondary winding; Be connected to the output and the PMW signal end of described delay driving circuit after the described electric capacity one end series resistance, the end of the same name of the negative electrode of the other end and diode and the former limit winding of transformer links to each other the non-same polarity ground connection of the former limit winding of the anode of described diode and transformer.
Described synchronous rectifier turn-offs circuits for triggering and is made of a transistor, an electric capacity, a resistance and two diodes; An end links to each other with the negative electrode of first diode after described electric capacity and the resistance parallel connection, and the other end links to each other with transistorized base stage; The anode of described first diode links to each other with the end of the same name of the secondary winding of the transformer of described isolation differential circuit; Described transistorized grounded emitter, collector electrode links to each other with the negative electrode of described second diode; The anode of described second diode links to each other with the gate pole of synchronous rectifier.
Described synchronous rectifier self-locking and driving holding circuit constitute by driving winding, a resistance, three diodes and a triode; The end ground connection of the same name of described driving winding, non-same polarity links to each other with the anode of first diode; One end of described first diode cathode and resistance, the collector electrode of triode and second diode cathode link to each other; The anode of described second diode links to each other with the emitter of the gate pole of described synchronous rectifier and triode; The negative electrode of described the 3rd diode links to each other plus earth with the base stage of the other end of described resistance and triode.
Described converter is two anti exciting converters, have the former limit of main transformer winding, main transformer secondary winding and first main power tube and second main power tube, the end of the same name of the former limit of described main transformer winding links to each other with the source electrode of first main power tube, the non-same polarity of the former limit of main transformer winding links to each other with the drain electrode of second main power tube, described delay driving circuit links to each other respectively with the gate pole of described power tube, the drain electrode of described first main power tube connects positive source, the source ground of described second main power tube.
Described converter is three winding clamp anti exciting converters, have the former limit of main transformer winding, main transformer secondary winding, the tertiary winding, main power tube and clamping diode, the non-same polarity of the former limit of main transformer winding links to each other with the drain electrode of main power tube, the end of the same name of the tertiary winding links to each other with the negative electrode of clamping diode, described delay driving circuit links to each other with the gate pole of described main power tube, the source electrode of described main power tube and the plus earth of clamping diode, the end of the same name of the former limit of described main transformer winding links to each other with the different name end of the tertiary winding.
Described converter is a RCD clamp anti exciting converter, have the former limit of winding main transformer winding, main transformer secondary winding, main power tube, clamping capacitance, clamp resistance and clamping diode, the non-same polarity of the former limit of main transformer winding links to each other with the anode of clamping diode, the drain electrode of power tube, an end links to each other with the negative electrode of clamping diode after clamping capacitance and the parallel connection of clamp resistance, and the other end links to each other with the end end of the same name of the former limit of main transformer winding, described delay driving circuit links to each other with the gate pole of described main power tube, the source ground of described main power tube.
Described converter is the active-clamp anti exciting converter, have the former limit of main transformer, main transformer secondary winding, first main power tube, second main power tube and clamping capacitance, the end of the same name of the former limit of described main transformer winding links to each other by the drain electrode of clamping capacitance with second power tube, the source electrode of described second main power tube links to each other with the drain electrode of described first main power tube and the non-same polarity of the former limit of main transformer winding, described delay driving circuit links to each other with the gate pole of first main power tube, the source ground of described main power tube.
Described converter is the two anti exciting converters of diode clamp, has the former limit of main transformer winding, main transformer secondary winding, first main power tube, second main power tube and two clamping diodes, the end of the same name of the former limit of main transformer winding links to each other with the source electrode of first main power tube, the non-same polarity of the former limit of main transformer winding links to each other with the drain electrode of second main power tube, the anode of second clamping diode is connected with the source electrode of second main power tube, negative electrode is connected with the end of the same name of the former limit of main transformer winding, the negative electrode of first clamping diode is connected with the drain electrode of first main power tube, anode is connected with the non-same polarity of the former limit of main transformer winding, and described delay driving circuit links to each other respectively with the gate pole of two main power tubes.
Described converter is the two anti exciting converters of active-clamp, has the former limit of main transformer, main transformer secondary winding, first main power tube, second main power tube, clamping capacitance and the 3rd main power tube, the end of the same name of the former limit of main transformer winding links to each other with the source electrode of first main power tube, the non-same polarity of the former limit of main transformer winding Np links to each other with the drain electrode of second main power tube, in parallel behind the drain electrode of clamping capacitance and the 3rd main power tube and the source series with the former limit of main transformer winding, described delay driving circuit and first, the gate pole of second main power tube links to each other respectively, the drain electrode of described first main power tube connects positive source, the source ground of second main power tube, the gate pole of the 3rd main power tube links to each other with described drive circuit.
Self-driven circuit of the present invention is regulated the dead band that turns on and off between main power tube and the synchronous rectifier by the delay driving circuit on former limit and synchronous rectifier shutoff circuits for triggering, the synchronous rectification tube drive circuit of secondary, thereby control common conduction loss, improve the efficient of converter.What is more important, the self-driven circuit of this synchronous rectifier only need pass to a voltage signal triggering synchronous of secondary rectifying tube when the pwm signal rising edge of former limit shutoff, and in main power tube conduction period, the shutoff of synchronous rectifier is kept by described synchronous rectifier latching circuit.Therefore, the self-driven circuit of this synchronous rectifier does not need the whole PWM square-wave signal on former limit is passed to secondary.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is the common self-driven circuit of reverse exciting converter synchronous rectifier;
Fig. 2 (a) is the self-driven circuit of a kind of reverse exciting converter synchronous rectifier commonly used;
Fig. 2 (b) is the main waveform of each point in Fig. 2 (a) circuit;
Fig. 3 (a) is the self-driven circuit of reverse exciting converter synchronous rectifier of a kind of novelty of the present invention;
Fig. 3 (b) is the main waveform of each point in Fig. 3 (a) circuit;
Fig. 4 is two anti exciting converters of the self-driven circuit of application drawing 3 (a) synchronous rectifier;
Fig. 5 is three winding clamp anti exciting converters of the self-driven circuit of application drawing 3 (a) synchronous rectifier;
Fig. 6 is the R.C.D clamp anti exciting converter of the self-driven circuit of application drawing 3 (a) synchronous rectifier;
Fig. 7 is the active-clamp anti exciting converter of the self-driven circuit of application drawing 3 (a) synchronous rectifier;
Fig. 8 is the two anti exciting converters of the diode clamp of the self-driven circuit of application drawing 3 (a) synchronous rectifier;
Fig. 9 is the two anti exciting converters of the active-clamp of the self-driven circuit of application drawing 3 (a) synchronous rectifier;
Embodiment
With reference to Fig. 3 (a), the self-driven circuit of reverse exciting converter synchronous rectifier of the present invention, its converter comprise main transformer T1, main power tube S1 and synchronous rectification metal-oxide-semiconductor S3, and described self-driven circuit comprises:
A delay driving circuit will be exported to the gate pole of main power tube S1 after the pwm signal time-delay;
Isolate differential circuit for one, the input pwm signal is exported a narrow pulse signal;
A synchronous rectifier turn-offs circuits for triggering, receives the narrow pulse signal of self-isolation differential circuit output, and synchronous rectifier is turn-offed;
The self-locking of a synchronous rectifier and drive holding circuit, this circuit comprises a driving winding Na as the second secondary winding of main transformer, during main power tube S1 opens with the gate pole clamper of described synchronous rectification metal-oxide-semiconductor S3 in no-voltage; Keep described synchronous rectification metal-oxide-semiconductor S3 conducting at main power tube S1 blocking interval.
Described delay driving circuit is made of delay circuit and drive circuit, wherein, an example of described delay circuit be by with diode with after resistance is in parallel, connect with ground capacity again and constitute.
Described isolation differential circuit is made of transformer T2, capacitor C 1, a resistance R 1 and a diode D1, wherein, transformer T2 links to each other with the output and the PMW signal end of described delay driving circuit after comprising the described capacitor C 1 one end series resistance R1 of former limit winding Npp and secondary winding Nss, the end of the same name of the negative electrode of the other end and diode D1 and the former limit winding Npp of transformer T2 links to each other the non-same polarity ground connection of the former limit winding Npp of the anode of described diode D1 and transformer T2.
Described synchronous rectifier turn-offs circuits for triggering and is made of a transistor Q1, capacitor C 2, a resistance R 2 and two diode D2, D3; Described capacitor C 2 links to each other with the negative electrode of the first diode D2 with resistance R 2 backs in parallel one end, and the other end links to each other with the base stage of transistor Q1; The anode of the described first diode D2 links to each other with the end of the same name of the secondary winding Nss of the transformer of described isolation differential circuit; The emitter of described transistor Q1 links to each other with the non-same polarity of the secondary winding Nss of described transformer, and collector electrode links to each other with the negative electrode of the described second diode D3; The anode of the described second diode D3 links to each other with the gate pole of synchronous rectifier S3.
Described synchronous rectifier self-locking and drive holding circuit by drive winding Na, resistance R 5, three diode D5, D4, D6 and triode Q2 constitute; The end ground connection of the same name of described driving winding Na, non-same polarity links to each other with the anode of the first diode D5; One end of described first diode D5 negative electrode and resistance R 5, the collector electrode of triode Q2 and the second diode D4 negative electrode link to each other; The gate pole of the anode of the described second diode D4 and described synchronous rectifier S3 and triode Q2 emitter link to each other; The negative electrode of described the 3rd diode D6 links to each other with the other end of described resistance R 5 and the base stage of triode Q2, and anode links to each other with the emitter that described synchronous rectifier turn-offs transistor Q1 in the circuits for triggering.
The operation principle of the self-driven circuit of above-mentioned synchronous rectifier is as follows:
With reference to Fig. 3 (b), at t=t0 constantly, pwm signal from control chip becomes height by hanging down, pwm signal makes isolation drive transformer T2 through differential circuit R1C1 former limit winding Npp end of the same name is being for just, thereby T2 secondary winding Nss voltage negative just down on becoming (end of the same name for just) turn-offs synchronous rectifier S3 through diode D2, speed-up capacitor C2 turn-on transistor Q1.Pwm signal through open during in t=t1 after the delay circuit time-delay S1 with store energy in transformer T1; Negative just down on the former limit winding Np voltage of transformer T1 becomes (end of the same name for just), thereby drive winding Na voltage and become and just going up negative (end of the same name for just) down and be added on the diode D5 through diode D6, resistance R 5, synchronous rectifier S3 grid source electrode is clamped in no-voltage through diode D4, thereby keeps shutoff.In the t=t3 moment, pwm signal is low by hypermutation, and the former limit winding Np voltage of transformer T1 begins oppositely, and T1 secondary winding Ns, driving winding Na voltage also begin oppositely thereupon.During t3~t4, after the reverse driving winding Na voltage of beginning made transistor Q2 conducting, beginning provided driving for synchronous rectifier S3.The energy that is stored among the transformer T1 offers load by secondary winding Ns and synchronous rectifier S3.
By above-mentioned operation principle as seen, the synchronous rectifier that turns on and off delay driving circuit that the dead band can be by former limit and secondary between former secondary power tube S1, the S3 turn-offs circuits for triggering, the synchronous rectification tube drive circuit be regulated, thereby control common conduction loss, improve the efficient of converter.What is more important, the self-driven circuit of this synchronous rectifier only need pass to a voltage signal triggering synchronous of secondary rectifying tube by isolating transformer T2 when the pwm signal rising edge of former limit shutoff, in former limit S1 conduction period, the shutoff of synchronous rectifier is kept by described synchronous rectifier latching circuit.Therefore, the self-driven circuit of this synchronous rectifier does not need the whole PWM square-wave signal on former limit is passed to secondary, and isolating transformer T2 does not need transmitted power.These characteristics make that the isolating transformer T2 volume in the self-driven circuit of this synchronous rectifier is little, and high power density realizes easily, and is suitable for the occasion that former secondary needs high pressure to isolate.
Invention technology to Fig. 3 (a) is promoted, and also can obtain other invention scheme of Fig. 4 one Fig. 9.Their The characteristics is as follows:
Fig. 4 is the popularization of the self-driven circuit of synchronous rectifier of the present invention in two circuit of reversed excitation.This circuit has the former limit winding Np of main transformer T1, secondary winding Ns and power MOS pipe S1, the S2 of main transformer T1, the end of the same name of described winding Np links to each other with the source electrode of power MOS pipe S1, the non-same polarity of winding Np links to each other with the drain electrode of power MOS pipe S2, described delay driving circuit links to each other respectively with the gate pole of described power MOS pipe S1 and S2, the drain electrode of described power tube S1 meets positive source Vin, the source ground of described power tube S2.
Fig. 5 is the popularization of the self-driven circuit of synchronous rectifier of the present invention in three winding clamp circuit of reversed excitation.This three winding (Nb, Np, Ns) clamp anti exciting converter has the former limit winding Np of tertiary winding Nb, main transformer T1, the secondary winding Ns of main transformer T1, power MOS pipe S1 and clamping diode Db, the non-same polarity of winding Np links to each other with the drain electrode of power MOS pipe S1, the end of the same name of winding Nb links to each other with the negative electrode of clamping diode Db, described delay driving circuit links to each other with the gate pole of described power MOS pipe S1, the plus earth of the source electrode of described power tube S1 and clamping diode Db, the end of the same name of the former limit of described transformer winding Np links to each other with the different name end of tertiary winding Nb.
Fig. 6 is the popularization of the self-driven circuit of synchronous rectifier of the present invention in R.C.D clamp circuit of reversed excitation.This R.C.D clamp anti exciting converter has the former limit winding Np of main transformer T1, secondary winding Ns, power MOS pipe S1, clamping capacitance Cb, clamp resistance R b and the clamping diode Db of main transformer T1, the non-same polarity of winding Np links to each other with the anode of clamping diode Db, the drain electrode of power MOS pipe S1, an end links to each other with the negative electrode of clamping diode Db after clamping capacitance Cb and the clamp resistance R b parallel connection, and the other end links to each other with the end end of the same name of winding Np.Described delay driving circuit links to each other with the gate pole of described power MOS pipe S1, the source ground of described power tube S1.
Fig. 7 is the popularization of the self-driven circuit of synchronous rectifier of the present invention in the active-clamp circuit of reversed excitation.This active-clamp anti exciting converter has the former limit winding Np of main transformer T1, secondary winding Ns, power MOS pipe S1, S2 and the clamping capacitance Cc of main transformer T1, the end of the same name of described winding Np links to each other with the drain electrode of power MOS pipe S2 by clamping capacitance Cc, the source electrode of described power MOS pipe S2 links to each other with the drain electrode of described power MOS pipe S1 and the non-same polarity of winding Np, described delay driving circuit links to each other with the gate pole of power MOS pipe S1, the source ground of described power tube S1.
Fig. 8 is the popularization of the self-driven circuit of synchronous rectifier of the present invention in the two circuit of reversed excitation of diode clamp.The two anti exciting converters of this diode clamp have the former limit winding Np of main transformer T1, the secondary winding Ns of main transformer T1, power MOS pipe S1, S2 and clamping diode D5, D6, the end of the same name of winding Np links to each other with the source electrode of power MOS pipe S1, the non-same polarity of winding Np links to each other with the drain electrode of power MOS pipe S2, the anode of clamping diode D6 is connected with the source electrode of power MOS pipe S2, negative electrode is connected with the end of the same name of winding Np, the negative electrode of clamping diode D5 is connected with the drain electrode of power MOS pipe S1, anode is connected with the non-same polarity of winding Np, described delay driving circuit and power MOS pipe S1, the gate pole of S2 links to each other respectively.
Fig. 9 is the popularization of the self-driven circuit of synchronous rectifier of the present invention in the two circuit of reversed excitation of active-clamp.The two anti exciting converters of this active-clamp have the former limit winding Np of main transformer T1, the secondary winding Ns of main transformer T1, power MOS pipe S1, S2, clamping capacitance Cc and power MOS pipe S4, the end of the same name of winding Np links to each other with the source electrode of power MOS pipe S1, the non-same polarity of winding Np links to each other with the drain electrode of power MOS pipe S2, in parallel behind the drain electrode of clamping capacitance Cc and power MOS pipe S4 and the source series with winding Np, its two ends are connected with non-same polarity with the end of the same name of winding Np respectively, described delay driving circuit and power MOS pipe S1, the gate pole of S2 links to each other respectively, the drain electrode of described power tube S1 meets positive source Vin, the source ground of power tube S2, the gate pole of power tube S4 links to each other with described drive circuit.
More than the present invention is had been described in detail, but the present invention is not limited thereto, and is all in improvement or the replacement done without prejudice to the spirit and the content of invention, should be regarded as belonging to protection scope of the present invention.

Claims (11)

1, the self-driven circuit of reverse exciting converter synchronous rectifier, its converter comprise main transformer (T1), main power tube (S1) and synchronous rectifier (S3), it is characterized in that, described self-driven circuit comprises:
A delay driving circuit will be exported to the gate pole of main power tube (S1) after the pwm signal time-delay;
Isolate differential circuit for one, the input pwm signal is exported a narrow pulse signal;
A synchronous rectifier turn-offs circuits for triggering, receives the narrow pulse signal of self-isolation differential circuit output, and synchronous rectifier (S3) is turn-offed;
The self-locking of a synchronous rectifier and drive holding circuit, this circuit comprises a driving winding (Na) as the second secondary winding of main transformer, during main power tube (S1) is opened with the gate pole clamper of described synchronous rectifier (S3) in no-voltage; Keep described synchronous rectifier (S3) conducting at main power tube (S1) blocking interval.
2, the self-driven circuit of reverse exciting converter synchronous rectifier as claimed in claim 1, it is characterized in that described delay driving circuit is made of delay circuit and drive circuit, wherein, described delay circuit be by with diode with after resistance is in parallel, connect with ground capacity again and constitute.
3, the self-driven circuit of reverse exciting converter synchronous rectifier as claimed in claim 1, it is characterized in that described isolation differential circuit is made of transformer (T2), an electric capacity (C1), a resistance (R1) and a diode (D1), wherein, transformer (T2) comprises former limit winding (Npp) and secondary winding (Nss); Be connected to the output and the PMW signal end of described delay driving circuit after described electric capacity (C1) the end series resistance (R1), the end of the same name of the negative electrode of the other end and diode (D1) and the former limit winding (Npp) of transformer (T2) links to each other the non-same polarity ground connection of the former limit winding (Npp) of the anode of described diode (D1) and transformer (T2).
4, the self-driven circuit of reverse exciting converter synchronous rectifier as claimed in claim 1 is characterized in that described synchronous rectifier turn-offs circuits for triggering and is made of transistor (Q1), an electric capacity (C2), a resistance (R2) and two diodes (D2, D3); Described electric capacity (C2) links to each other with the negative electrode of first diode (D2) with resistance (R2) back in parallel one end, and the other end links to each other with the base stage of transistor (Q1); The anode of described first diode (D2) links to each other with the end of the same name of the secondary winding (Nss) of the transformer (T2) of described isolation differential circuit, the grounded emitter of described transistor (Q1), collector electrode links to each other with the negative electrode of described second diode (D3), and the anode of described second diode (D3) links to each other with the gate pole of synchronous rectifier (S3).
5, the self-driven circuit of reverse exciting converter synchronous rectifier as claimed in claim 1 is characterized in that described synchronous rectifier self-locking and drives holding circuit constituting by driving winding (Na), a resistance (R5) and three diodes (D5, D4, D6) and a transistor (Q2); The end ground connection of the same name of described driving winding (Na), non-same polarity links to each other with the anode of first diode (D5); One end of described first diode (D5) negative electrode and resistance (R5), the collector electrode of transistor (Q2) and second diode (D4) negative electrode link to each other; The anode of described second diode (D4) links to each other with the gate pole of described synchronous rectifier (S3) and the emitter of transistor (Q2); The negative electrode of described the 3rd diode (D6) links to each other plus earth with the base stage of the other end of described resistance R 5 and transistor (Q2).
6, self-driven circuit as any one described reverse exciting converter synchronous rectifier of claim 1~5, it is characterized in that described converter is two anti exciting converters, has the former limit of main transformer winding (Np), main transformer secondary winding (Ns) and first main power tube (S1) and second main power tube (S2), the end of the same name of the former limit of described main transformer winding (Np) links to each other with the source electrode of first main power tube (S1), the non-same polarity of the former limit of main transformer winding (Np) links to each other with the drain electrode of second main power tube (S2), described delay driving circuit links to each other respectively with the gate pole of described two power tubes (S1 and S2), the drain electrode of described first main power tube (S1) connects positive source (Vin), the source ground of described second main power tube (S2).
7, self-driven circuit as any one described reverse exciting converter synchronous rectifier of claim 1~5, it is characterized in that described converter is three winding clamp anti exciting converters, has the former limit of main transformer winding (Np), main transformer secondary winding (Ns), the tertiary winding (Nb), main power tube (S1) and clamping diode (Db), the non-same polarity of main transformer (T1) former limit winding (Np) links to each other with the drain electrode of main power tube (S1), the end of the same name of the tertiary winding (Nb) links to each other with the negative electrode of clamping diode (Db), described delay driving circuit links to each other with the gate pole of described main power tube (S1), the plus earth of the source electrode of described main power tube (S1) and clamping diode (Db), the end of the same name of the former limit of described main transformer winding (Np) links to each other with the different name end of the tertiary winding (Nb).
8, self-driven circuit as any one described reverse exciting converter synchronous rectifier of claim 1~5, it is characterized in that described converter is a RCD clamp anti exciting converter, has winding main transformer (T1) former limit winding (Np), main transformer secondary winding (Ns), main power tube (S1), clamping capacitance (Cb), clamp resistance (Rb) and clamping diode (Db), the anode of the non-same polarity of main transformer (T1) former limit winding (Np) and clamping diode (Db), the drain electrode of power tube (S1) links to each other, clamping capacitance (Cb) links to each other with the negative electrode of clamping diode (Db) with clamp resistance (Rb) back in parallel one end, and the other end links to each other with the end of the same name of main transformer (T1) former limit winding (Np), described delay driving circuit links to each other with the gate pole of described main power tube (S1), the source ground of described main power tube (S1).
9, self-driven circuit as any one described reverse exciting converter synchronous rectifier of claim 1~5, it is characterized in that described converter is the active-clamp anti exciting converter, has the former limit of main transformer (T1) (Np), main transformer secondary winding (Ns), first main power tube (S1), the second main power tube S2 and clamping capacitance (Cc), the end of the same name of described main transformer (T1) former limit winding (Np) links to each other with the drain electrode of second power tube (S2) by clamping capacitance (Cc), the source electrode of described second main power tube (S2) links to each other with the drain electrode of described first main power tube (S1) and the non-same polarity of main transformer (T1) former limit winding (Np), described delay driving circuit links to each other with the gate pole of first main power tube (S1), the source ground of described main power tube (S1).
10, self-driven circuit as any one described reverse exciting converter synchronous rectifier of claim 1~5, it is characterized in that described converter is the two anti exciting converters of diode clamp, has main transformer (T1) former limit winding (Np), main transformer secondary winding (Ns), first main power tube (S1), second main power tube (S2) and two clamping diode (D5, D6), the end of the same name of main transformer (T1) former limit winding (Np) links to each other with the source electrode of first main power tube (S1), the non-same polarity of main transformer (T1) former limit winding (Np) links to each other with the drain electrode of second main power tube (S2), the anode of second clamping diode (D6) is connected with the source electrode of second main power tube (S2), negative electrode is connected with the end of the same name of main transformer (T1) former limit winding (Np), the negative electrode of first clamping diode (D5) is connected with the drain electrode of first main power tube (S1), anode is connected with the non-same polarity of the former limit of main transformer (T1) (Np) winding, described delay driving circuit and two main power tube (S1, S2) gate pole links to each other respectively.
11, self-driven circuit as any one described reverse exciting converter synchronous rectifier of claim 1~5, it is characterized in that described converter is the two anti exciting converters of active-clamp, has the former limit of main transformer (T1) (Np), main transformer secondary winding (Ns), first main power tube (S1), second main power tube (S2), clamping capacitance (Cc) and the 3rd main power tube (S4), the end of the same name of main transformer (T1) former limit winding (Np) links to each other with the source electrode of first main power tube (S1), the non-same polarity of main transformer (T1) former limit winding (Np) links to each other with the drain electrode of second main power tube (S2), in parallel behind the drain electrode of clamping capacitance (Cc) and the 3rd main power tube (S4) and the source series with main transformer (T1) former limit winding (Np), described delay driving circuit and first, second main power tube (the S1, S2) gate pole links to each other respectively, the drain electrode of described first main power tube (S1) connects positive source (Vin), the source ground of second main power tube (S2), the gate pole of the 3rd main power tube (S4) links to each other with described drive circuit.
CNB2004100596069A 2004-06-11 2004-06-11 Self-driving circuit of antilaser converter synchronous rectifier Expired - Fee Related CN1316726C (en)

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CN101515761B (en) * 2009-04-03 2011-01-05 北京新雷能有限责任公司 Synchronous rectification circuit of reverse excitation circuit provided with adjustable dead time
CN103812379A (en) * 2012-11-13 2014-05-21 徐夫子 Conversion device for improving electricity utilization efficiency
CN105048836A (en) * 2015-09-01 2015-11-11 中国电子科技集团公司第四十三研究所 Switching power supply flyback synchronous rectification self-driving circuit
CN105281578B (en) * 2015-11-18 2018-06-29 广州金升阳科技有限公司 Synchronous commutation control device and Switching Power Supply
CN106357120B (en) * 2016-09-27 2019-06-21 深圳Tcl数字技术有限公司 Switching power circuit
CN107528458B (en) * 2017-06-23 2019-12-10 上海源微电子科技有限公司 Active clamping circuit in switching power supply
CN113809926A (en) * 2021-08-16 2021-12-17 广州金升阳科技有限公司 Synchronous rectification control circuit

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CN1424811A (en) * 2003-01-06 2003-06-18 艾默生网络能源有限公司 Synchronous rectifying driving circuit for DC converter
CN1464629A (en) * 2002-06-06 2003-12-31 伊博电源(杭州)有限公司 Novel synchronous rectified drive circuit of reversed excitation circuit

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