CN201466998U - Synchronous rectification driving circuit for voltage-multiplying rectification - Google Patents
Synchronous rectification driving circuit for voltage-multiplying rectification Download PDFInfo
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- CN201466998U CN201466998U CN2009201250723U CN200920125072U CN201466998U CN 201466998 U CN201466998 U CN 201466998U CN 2009201250723 U CN2009201250723 U CN 2009201250723U CN 200920125072 U CN200920125072 U CN 200920125072U CN 201466998 U CN201466998 U CN 201466998U
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Abstract
The utility model discloses a synchronous rectification driving circuit for voltage-multiplying rectification, comprising a high-frequency transformer T1, a current mutual inductor CT1, an output capacitance C1, an output capacitance C2, a synchronous rectification pipe SR1, a synchronous rectification pipe SR2 and two driving units for driving the synchronous rectification pipe SR1 and the synchronous rectification pipe SR2 respectively; the synchronous rectification pipe SR1, a synchronous rectification pipe SR2 is characterized in that: each driving unit comprises a reforming and resetting circuit and a driving self-supplying circuit; compared with the prior art, the synchronous rectification driving circuit has the beneficial effects that: 1. only one current mutual inductor is needed for realizing driving of the two SR lines, the circuit is simplified and the cost is reduced; 2. self supplying and SR floating driving of the driving circuit can be realized, the driving is simple without an energy feedback circuit. 3. the synchronous rectification driving circuit is suitable for high-voltage output and adopts a low-voltage synchronous rectification device, the conduction loss is reduced and the efficiency is improved.
Description
Technical field
The utility model relates to a kind of synchronous rectification driving circuit.More particularly, the utility model relates to a kind of current control synchronization commutation driving circuit that is applicable to voltage doubling rectifing circuit.
Background technology
Along with the progress of semiconductor technology, the conducting resistance of mesolow MOSFET is more and more littler, therefore in the Switching Power Supply of low-voltage, high-current, in order to reduce conduction loss, generally all adopts synchronous rectification.In the application of some mesolow DC converting, the output voltage of converter is generally and reaches more than 48 volts, and this electric pressure adopts halfwave rectifier or centre cap rectifier structure, can cause the voltage stress of rectifying device very high, can't adopt low-voltage device, reduce conduction loss.When voltage is higher than 60V output, generally can only adopt the diode rectification mode, because the MOSFET cost of the above electric pressure of 200V is higher, conducting resistance is bigger, has been not suitable for using in synchronous rectification.Consider that the junction capacitance between transformer leakage inductance and the MOSFET drain-source has vibration, cause due to voltage spikes, so the voltage stress of rectifying device can surpass voltage ideally.
The voltage multiplying rectifier technology can be eliminated the due to voltage spikes on the rectifying device, reduces voltage stress, the withstand voltage output voltage that remains on that rectifying device is born.Therefore, adopt this structure can adopt low pressure MOSFET, reduce conduction loss as synchronous rectification.But,, drive more complicated because a MOSFET need float driving in the voltage multiplying rectifier structure.If adopt the method among the figure one, need two current transformers as independently sampling and driving, cost is higher.And because current transformer is connected in series with synchronous rectifier, and there are some leakage inductances in instrument transformer itself, and the generation of the junction capacitance between the drain-source of MOSFET resonance, cause due to voltage spikes, reduce the voltage clamp effect of multiplication of voltage structure.
Summary of the invention
In order to reduce the quantity of current transformer, simplify circuit structure, reduce cost, the utility model proposes a kind of instrument transformer generation two-way method of driving of utilizing.By utilizing two signal windings of instrument transformer, produce two-way respectively and drive deserved two synchronous rectifiers.
For this reason, the utility model adopts following technical scheme: the synchronous rectification driving circuit that is applicable to voltage multiplying rectifier, comprise high frequency transformer T1, current transformer CT1, output capacitance C1, output capacitance C2, synchronous rectifier SR1, synchronous rectifier SR2 and two driver elements that are respectively applied for driving synchronous rectifier SR1 and synchronous rectifier SR2, it is characterized in that the secondary windings in series of first side winding N1 and the high frequency transformer of current transformer CT1, two secondary side winding of current transformer CT1 are connected respectively to the input of two driver elements; Described each driver element comprises:
Shaping and reset circuit, form drive signal after the current signal of the controlled synchronous rectifier that current transformer CT1 secondary side is detected is converted to voltage signal and shaping, and when this synchronous rectification tube current is zero, current transformer CT1 is resetted; One of them secondary side of input termination current transformer CT1 of described shaping and reset circuit;
One drives self-powered circuit, the energy that current transformer CT1 gathers is stored, and produced a voltage source that changes with the mean variation of electric current in half switch periods in the synchronous rectifying tube, gives whole drive circuitry; The secondary side of the input termination current transformer CT1 of described driving self-powered circuit, its output termination push-pull power amplifier circuit.
Compared with prior art, the beneficial effects of the utility model are:
1, only needs a current transformer, realize two-path SR driving, simplified circuit, reduced cost.
2, can realize the floating driving of the self-powered and the SR of drive circuit, drive simply, need not the energy feedback circuit.
3, be applicable to high voltage output and adopt low pressure synchronous rectification device, reduce conduction loss, raise the efficiency.
As further improvement of the utility model, the output of shaping and reset circuit also is provided with a push-pull power amplifier circuit, will carry out power amplification rear drive corresponding synchronous rectifying tube from the drive signal of shaping and reset circuit output; The input termination shaping of described push-pull power amplifier circuit and the output of reset circuit, its output connects the gate pole of controlled synchronous rectifier.
According to the utility model, drive circuit and main circuit can adopt such connected mode: the non-same polarity of high frequency transformer T1 connects the end of the same name of current transformer CT1 first side winding N1, the negative pole of the termination output capacitance C1 of the same name of high frequency transformer T1 and the positive pole of output capacitance C2; The source electrode of synchronous rectifier SR1 connects the non-same polarity of current transformer CT1 first side winding N1 and the drain electrode of synchronous rectifier SR2, and the drain electrode of synchronous rectifier SR connects the positive pole of output capacitance C1, and gate pole links to each other with the output of its driver element; The negative pole of output capacitance C2 connects the source electrode of synchronous rectifier SR2; The gate pole of synchronous rectifier SR2 links to each other with the output of its driver element.
According to the utility model, drive circuit and main circuit can also adopt such connected mode: the non-same polarity of high frequency transformer T1 connects the end of the same name of current transformer CT1 first side winding N1, the negative pole of the termination output capacitance C2 of the same name of high frequency transformer T1 and the source electrode of synchronous rectifier SR2, the drain electrode of synchronous rectifier SR2 connects the source electrode of synchronous rectifier SR1 and the positive pole of output capacitance C1, the gate pole of synchronous rectifier SR2 connects the output of its driver element, the negative pole of output capacitance C1 connects the non-same polarity of current transformer CT1 first side winding N1, the drain electrode of synchronous rectifier SR1 connects the positive pole of output capacitance C2, and the gate pole of synchronous rectifier SR1 connects the output of its driver element.
According to the utility model, a typical embodiment is: described shaping and reset circuit are by diode D1, diode D2, diode D7, resistance R 1 and triode Q1 form, the negative electrode of diode D1 connects the end of the same name of current transformer CT1 secondary side winding N2, the collector electrode of triode Q1, the anode of the end of anode connecting resistance R1, the base stage of triode Q1 and diode D7, the non-same polarity of another terminating diode D2 of resistance R 1 and the negative electrode of diode D7, current transformer CT1 secondary side winding N2, the anode of diode D2 connects the emitter of triode Q1; Described push-pull power amplifier circuit is made up of NPN type triode Q2 and positive-negative-positive triode Q3, the base stage of triode Q2 connects the end of the same name of the base stage summation current transformer CT1 secondary side winding N2 of triode Q3, the emitter of triode Q2 connects the emitter of triode Q3 and the control utmost point of synchronous rectifier SR1, and the collector electrode of triode Q3 connects the positive pole of diode D2.
Further improve again as of the present utility model, between the drain-source utmost point of each synchronous rectifier, also be provided with a mistake Drive Protecting Circuit.Described mistake Drive Protecting Circuit is made of the negative electrode of a terminating diode D10 of resistance R 5 and the drain electrode of synchronous rectifier SR1, the anode of another terminating diode D10 and the base stage of triode Q7 resistance R 5, diode D10 and triode Q7; The collector electrode of triode Q7 connects driver element, and emitter connects the source electrode of synchronous rectifier SR1.
According to the utility model, described driving self-powered circuit comprises energy storage capacitor C3 and diode D3.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples.
A kind of common voltage doubling rectifing circuit figure that utilizes diode of Fig. 1.
The another kind of diode voltage doubling rectifing circuit of Fig. 2 figure.
The circuit diagram of Fig. 3 existing in lock-in tube (SR), independently connect CT sampling and driving SR.
Propose to utilize a CT sampling to drive a kind of voltage doubling rectifing circuit figure of two-path SR in Fig. 4 the utility model.
Propose to utilize a CT sampling to drive the another kind of voltage doubling rectifing circuit figure of two-path SR in Fig. 5 the utility model.
Fig. 6 adopts CT of the present utility model to drive a kind of specific implementation method block diagram of SR.
Fig. 7 adopts CT of the present utility model to drive a kind of specific implementation circuit diagram of SR.
Fig. 8 the utility model is applied to a kind of embodiment one that drives the synchronous voltage multiplying rectifier structural circuit figure of protection with mistake.
Fig. 9 adopts CT of the present utility model to drive the embodiment two of SR specific implementation circuit diagram.
Figure 10 adopts CT of the present utility model to drive the embodiment three of SR specific implementation circuit diagram.
Figure 11 adopts CT of the present utility model to drive the embodiment four of SR specific implementation circuit diagram.
Figure 12 adopts CT of the present utility model to drive the embodiment five of SR specific implementation circuit diagram.
Figure 13 adopts CT of the present utility model to drive the embodiment six of SR specific implementation circuit diagram.
Figure 14 the utility model is applied to the circuit diagram of half-bridge LLC circuit.
Figure 15 the utility model is applied to the circuit diagram of full-bridge LLC circuit.
Embodiment
With reference to accompanying drawing 1, a kind of common voltage doubling rectifing circuit figure that utilizes diode.When bearing just down on the high frequency transformer current potential, diode D1 conducting, transformer gives capacitor C 1 charging Vo; Negative timing down on the high frequency transformer current potential, diode D2 conducting, transformer gives capacitor C 2 charging Vo; Voltage and be 2Vo on capacitor C 1 and the capacitor C 2.
With reference to accompanying drawing 2, another kind of diode voltage doubling rectifing circuit figure.Negative timing down on the high frequency transformer current potential, diode D2 conducting, transformer gives capacitor C 1 charging Vo; When bearing just down on the high frequency transformer current potential, diode D1 conducting, transformer and capacitor C 2 give capacitor C 1 charging 2Vo.
Fig. 3 is the circuit diagram of existing independently connect in lock-in tube (SR) CT sampling and driving SR, and its defective front was described, and did not repeat them here.
With reference to accompanying drawing 4, propose to utilize a CT sampling to drive a kind of diode voltage doubling rectifing circuit figure of two-path SR in the utility model, comprise synchronous rectification tube drive circuit, current transformer and main circuit.
Described main circuit is made up of high frequency transformer T1, synchronous rectifier SR1, synchronous rectifier SR2, capacitor C 1, capacitor C 2.The end of high frequency transformer T1 one termination current transformer CT1, an end of another termination capacitor C 1; The end of the termination current transformer CT1 first side winding N1 of synchronous rectifier SR1, an end of another termination capacitor C 1, gate pole links to each other with its drive circuit; One end of capacitor C 2 links to each other with the other end of capacitor C 1, the end of another termination synchronous rectifier SR2; The other end of synchronous rectifier SR2 links to each other with the other end of synchronous rectifier SR1, and gate pole links to each other with its drive circuit.
Described current transformer CT1 is made up of magnetic core, winding N1, winding N2 and winding N3.The end of the termination high frequency transformer T1 of winding N1, the end of another termination synchronous rectifier SR1; Winding N2 connects down the driver of synchronous rectifier SR2; Winding N3 connects the driver of synchronous rectifier SR1.
With reference to Fig. 5, propose to utilize a CT sampling to drive the another kind of voltage doubling rectifing circuit figure of two-path SR in the utility model.Compare with figure four, an end of capacitor C 1 connects the end of current transformer CT1 first side winding N1, the end of another termination synchronous rectifier SR1, the i.e. point of A among the figure; The other end of one termination synchronous rectifier SR1 of capacitor C 2, other end ground connection; The winding one end ground connection of high frequency transformer.All the other structures are constant.
Described synchronous rectification tube drive circuit will further specify below.
With reference to accompanying drawing 6, adopt CT of the present utility model to drive a kind of specific implementation method block diagram of SR, comprise current transformer CT1, shaping and reset circuit, drive self-powered circuit.
Described current transformer CT1 is made up of magnetic core, winding N1, winding N2 and winding N3.One end of first side winding N1 one termination high frequency transformer, secondary side winding N2 and winding N3 connect the drive circuit input of top tube and down tube respectively.
Described shaping and reset circuit go out the current transformer input, convert drive voltage signal then to and drive synchronous rectifier.
Described driving self-powered circuit is the power supply of drive circuit.Adjust because the rectification circuit driving voltage changes automatically with synchronous rectifying tube SR electric current, driving voltage reduces during underloading, and the synchronous rectification driving power consumption is reduced.
With reference to accompanying drawing 7, adopt CT of the present utility model to drive a kind of specific implementation circuit diagram of SR, comprise current transformer CT1, shaping and reset circuit and drive self-powered circuit.
Described shaping and reset circuit are by diode D1, diode D2, diode D7, and resistance R 1 and triode Q1 form, and the negative electrode of diode D1 connects the end of the same name of current transformer CT1 secondary side, the collector electrode of triode Q1, the end of anode connecting resistance R1; Another terminating diode D2 of resistance R 1 and the negative electrode of diode D7; The negative electrode of diode D2 connects the non-same polarity of current transformer CT1 secondary side, the other end of resistance R 1 and the negative electrode of diode D7; The anode of diode D2 connects the emitter of triode Q1 and the A point of main circuit.
Current transformer CT1 went out input then and converts drive voltage signal to by synchronous rectifier SR1, diode D2 when synchronous rectifier SR1 flow through current signal; When synchronous rectifier SR1 electric current was zero, current transformer CT1 secondary side resetted through resistance R 1, diode D1, diode D7, and drive voltage signal is closed in triode Q1 conducting simultaneously.
Described push-pull power amplifier circuit is made up of triode Q2 and triode Q3, and drive voltage signal is carried out power amplification rear drive synchronous rectifier SR1.Described triode Q2 is a NPN type pipe, described triode Q3 is the positive-negative-positive pipe, the base stage of triode Q2 connects the non-same polarity of the base stage summation current transformer CT1 secondary side of triode Q3, the emitter of triode Q2 connects the emitter of triode Q3 and the control utmost point of synchronous rectifier SR1, the collector electrode of triode Q3 connects an end of capacitor C 3, i.e. main circuit A point.
Described driving self-powered circuit comprises diode D3 and capacitor C 3, and the anode of diode D3 connects the end of the same name of current transformer CT1 secondary side, and negative electrode connects the collector electrode of triode Q2 and an end of capacitor C 3, another termination main circuit A point of capacitor C 3.
The input that drives self-powered circuit connects current transformer CT1 secondary side, is the power supply of drive circuit after diode D3 rectification, capacitor C 3 filtering.
First winding N2 of Current Transformer Secondary side connects the synchronous rectifier driver, and second winding N3 of current transformer connects down the synchronous rectifier driver.Two driver circuit structures are compared, and mainly are that the end of the same name of Current Transformer Secondary side winding is opposite, and all the other structures are constant.
Utility model point of the present utility model is: at first, by utilizing two signal windings of instrument transformer, produce the two-way drive signal respectively and drive two corresponding synchronous rectifiers.Only need a current transformer, simplified circuit, reduced cost.Secondly, can realize the floating driving of the self-powered and the MOSFET of drive circuit, drive simple.
With reference to Fig. 8; the utility model is applied to a kind of embodiment one that drives the synchronous voltage multiplying rectifier structural circuit figure of protection with mistake; comprise current transformer CT1, shaping and reset circuit, push-pull power amplifier circuit, drive circuit self-powered circuit and mistake Drive Protecting Circuit; comparing with a kind of specific implementation circuit of the employing of Fig. 6 CT driving of the present utility model SR mainly is to have increased driving logic clamp protective circuit; prevent that drive signal provides in advance when the conducting sequential of lock-in tube is switched up and down, all the other structures are constant.
Described drive circuit is compared with the drive circuit that Fig. 6 adopts CT of the present utility model to drive SR; increased a resistance R 3; one of resistance R 3 terminates at utmost point pipe Q1 collector electrode; the collector electrode of another termination triode Q2 base stage and triode Q7, promptly an end B point of the resistance R 3 of drive circuit links to each other with the collector electrode B point of the triode Q7 of mistake Drive Protecting Circuit.
Described mistake Drive Protecting Circuit is made up of resistance R 5, diode D10 and triode Q7, the end of pipe SR1 on the negative electrode of a terminating diode D10 of resistance R 5 and the synchronous rectifier, the anode of another terminating diode D10 and the base stage of triode Q7; The collector electrode of triode Q7 is an end B point of the B point resistance R 3 that connects drive circuit, and emitter connects main circuit A point.
First winding N2 of Current Transformer Secondary side connects the synchronous rectifier driver, and second winding N3 of current transformer connects down the synchronous rectifier driver.Two driver circuit structures are compared, and mainly are that the end of the same name of Current Transformer Secondary side winding is opposite, and all the other structures are constant.
With reference to Fig. 9, adopt CT of the present utility model to drive the embodiment two of SR specific implementation circuit diagram.Adopt and to realize in this structure that portion of energy directly to load output feed, raises the efficiency, can be applied to the not high situation of output voltage (less than 40V).Comparing with the circuit of Fig. 8 mainly is by diode D7 capacitor C 4 to be connected to capacitor C 2, the anode of the positive terminating diode D12 of the negative electrode C4 of the positive terminating diode D12 of capacitor C 2, and all the other structures are constant.
With reference to Figure 10, adopt CT of the present utility model to drive the embodiment three of SR specific implementation circuit diagram.The effect to Fig. 9 in similar, mainly be that portion of energy is directly fed back to output, raise the efficiency.Equally, this structure is applicable to when output voltage is low (Vo is less than 20V).Comparing with the circuit of Fig. 8 mainly is that capacitor C 4 is connected to output storage capacitor C1 by diode D12, the negative electrode of the positive terminating diode D12 of capacitor C 1, and the anode of the positive terminating diode D12 of C4, all the other structures are constant.
With reference to Figure 11, adopt CT of the present utility model to drive the embodiment four of SR specific implementation circuit diagram, the synchronous voltage doubling rectifing circuit that drives protection for the utility model band mistake is applied to another kind of voltage doubling rectifing circuit shown in Figure 2.Similar to the purpose of Figure 10, directly with the energy delivery among the portion C T to output capacitance.One end of capacitor C 1 connects the end of current transformer CT1 first side winding N1, the end of another termination synchronous rectifier SR1, an end of capacitor C 3 and the collector electrode of triode Q3, the i.e. point of A among the figure; Capacitor C 4 is connected to capacitor C 2 by diode D12.The other end of the anode termination synchronous rectifier SR1 of C2, the negative electrode of D12, other end ground connection; The winding one end ground connection of high frequency transformer.All the other structures are constant.
With reference to Figure 12, adopt CT of the present utility model to drive the embodiment five of SR specific implementation circuit diagram, the synchronous voltage doubling rectifing circuit that drives protection for the utility model band mistake is applied to another kind of voltage doubling rectifing circuit shown in Figure 2.Similar to the purpose of Figure 11, directly with the energy delivery among the portion C T to output capacitance.One end of capacitor C 1 connects the end of current transformer CT1 first side winding N1, the end of another termination synchronous rectifier SR2, an end of capacitor C 2 and ground; The end of another termination current transformer of the winding of high frequency transformer CT1 first side winding N1.Drain electrode, the other end ground connection of the positive termination synchronous rectifier SR1 of capacitor C 2; Capacitor C 4 is connected to the anode of C1 by diode D12.The anode of C1 connects the negative electrode of diode D12, and the anode of diode D12 is received the anode of C4, and all the other structures are constant.
With reference to Figure 14, voltage-multiplied synchronizing rectifier of the present utility model is applied in the circuit diagram in the half-bridge circuit, comprises half-bridge circuit and voltage-multiplied synchronizing rectifier circuit.
Described half-bridge circuit is made up of switching tube S2, high frequency transformer T1 under switching tube S1, the half-bridge on DC power supply Vin, the half-bridge.Switching tube S1 on the positive termination half-bridge of described DC power supply Vin, negative terminal meets switching tube S2 under the half-bridge; An end of the first side winding of another termination high frequency transformer T1 of switching tube S1 on the half-bridge; The end of switching tube S2 and ground under another termination half-bridge of the first side winding of high frequency transformer T1, the secondary side winding of high frequency transformer T1 connects voltage-multiplied synchronizing rectifier circuit.
Described voltage-multiplied synchronizing rectifier circuit is consistent with the circuit structure that utilizes a CT sampling to drive two-path SR among Fig. 4.
With reference to Figure 15, voltage-multiplied synchronizing rectifier of the present utility model is applied in the circuit diagram in the full-bridge circuit, comprises full-bridge circuit and voltage-multiplied synchronizing rectifier circuit.
Described full-bridge circuit is made up of switching tube S4, high frequency transformer T1 under switching tube S2, the full-bridge under switching tube S3, the full-bridge on switching tube S1, the full-bridge on DC power supply Vin, the full-bridge.The end of switching tube S3 on switching tube S1 and the full-bridge on the positive termination full-bridge of described DC power supply Vin, negative terminal connect switching tube S4 one end and ground under the end, full-bridge of switching tube S2 under the full-bridge; The end of switching tube S2 under an end of the first side winding of another termination high frequency transformer T1 of switching tube S1 and the full-bridge on the full-bridge; The other end of switching tube S4 under the end of switching tube S3 and the full-bridge on another termination full-bridge of the first side winding of high frequency transformer T1, the secondary side winding of high frequency transformer T1 connects voltage-multiplied synchronizing rectifier circuit.
Described voltage-multiplied synchronizing rectifier circuit is consistent with the circuit structure that utilizes a CT sampling to drive two-path SR among Fig. 4.
Propose in the utility model utilize CT sampling drive two-path SR circuit, adopt CT of the present utility model to drive the circuit that the specific implementation circuit of SR, circuit that the utility model band mistake drives the voltage multiplying rectifier structure of protection, circuit that the utility model is applied to half-bridge circuit and the utility model be applied to full-bridge circuit all can be applied to another kind of diode voltage doubling rectifing circuit shown in Figure 2.
The circuit that utilizes a CT sampling driving two-path SR that proposes in the utility model, the specific implementation circuit that adopts CT driving SR of the present utility model and the utility model band mistake drive the synchronous voltage doubling rectifing circuit of protecting and all can be applied to another kind of voltage doubling rectifing circuit shown in Figure 2.
At last, it is also to be noted that what more than enumerate only is specific embodiment of the utility model.Obviously, the utility model is not limited to above embodiment, and many distortion can also be arranged.All distortion that those of ordinary skill in the art can directly derive or associate from the disclosed content of the utility model all should be thought the protection range of utility model.
What should be understood that is: the foregoing description is just to explanation of the present utility model, rather than to restriction of the present utility model, any utility model that does not exceed in the utility model connotation scope is created, and all falls within the protection range of the present utility model.
Claims (8)
1. be applicable to the synchronous rectification driving circuit of voltage multiplying rectifier, comprise high frequency transformer T1, current transformer CT1, output capacitance C1, output capacitance C2, synchronous rectifier SR1, synchronous rectifier SR2 and two driver elements that are respectively applied for driving synchronous rectifier SR1 and synchronous rectifier SR2, it is characterized in that the secondary windings in series of first side winding N1 and the high frequency transformer of current transformer CT1, two secondary side winding of current transformer CT1 are connected respectively to the input of two driver elements; Described each driver element comprises: shaping and reset circuit, form drive signal after the current signal of the controlled synchronous rectifier that current transformer CT1 secondary side is detected is converted to voltage signal and shaping, and when this synchronous rectification tube current is zero, current transformer CT1 is resetted; One of them secondary side of input termination current transformer CT1 of described shaping and reset circuit;
One drives self-powered circuit, the energy that current transformer CT1 gathers is stored, and produced a voltage source that changes with the mean variation of electric current in half switch periods in the synchronous rectifying tube, gives whole drive circuitry; The secondary side of the input termination current transformer CT1 of described driving self-powered circuit, its output termination push-pull power amplifier circuit.
2. the synchronous rectification driving circuit that is applicable to voltage multiplying rectifier as claimed in claim 1, the output that it is characterized in that shaping and reset circuit also is provided with a push-pull power amplifier circuit, will carry out power amplification rear drive corresponding synchronous rectifying tube from the drive signal of shaping and reset circuit output; The input termination shaping of described push-pull power amplifier circuit and the output of reset circuit, its output connects the gate pole of controlled synchronous rectifier.
3. the synchronous rectification driving circuit that is applicable to voltage multiplying rectifier as claimed in claim 2, it is characterized in that the non-same polarity of high frequency transformer T1 connects the end of the same name of current transformer CT1 first side winding N1, the negative pole of the termination output capacitance C1 of the same name of high frequency transformer T1 and the positive pole of output capacitance C2; The source electrode of synchronous rectifier SR1 connects the non-same polarity of current transformer CT1 first side winding N1 and the drain electrode of synchronous rectifier SR2, and the drain electrode of synchronous rectifier SR connects the positive pole of output capacitance C1, and gate pole links to each other with the output of its driver element; The negative pole of output capacitance C2 connects the source electrode of synchronous rectifier SR2; The gate pole of synchronous rectifier SR2 links to each other with the output of its driver element.
4. the synchronous rectification driving circuit that is applicable to voltage multiplying rectifier as claimed in claim 2, it is characterized in that the non-same polarity of high frequency transformer T1 connects the end of the same name of current transformer CT1 first side winding N1, the negative pole of the termination output capacitance C2 of the same name of high frequency transformer T1 and the source electrode of synchronous rectifier SR2, the drain electrode of synchronous rectifier SR2 connects the source electrode of synchronous rectifier SR1 and the positive pole of output capacitance C1, the gate pole of synchronous rectifier SR2 connects the output of its driver element, the negative pole of output capacitance C1 connects the non-same polarity of current transformer CT1 first side winding N1, the drain electrode of synchronous rectifier SR1 connects the positive pole of output capacitance C2, and the gate pole of synchronous rectifier SR1 connects the output of its driver element.
5. as claim 3 or the 4 described synchronous rectification driving circuits that are applicable to voltage multiplying rectifier, it is characterized in that described shaping and reset circuit are by diode D1, diode D2, diode D7, resistance R 1 and triode Q1 form, the negative electrode of diode D1 connects the end of the same name of current transformer CT1 secondary side winding N2, the collector electrode of triode Q1, the end of anode connecting resistance R1, the anode of the base stage of triode Q1 and diode D7, another terminating diode D2 of resistance R 1 and the negative electrode of diode D7, the non-same polarity of current transformer CT1 secondary side winding N2, the anode of diode D2 connects the emitter of triode Q1; Described push-pull power amplifier circuit is made up of NPN type triode Q2 and positive-negative-positive triode Q3, the base stage of triode Q2 connects the end of the same name of the base stage summation current transformer CT1 secondary side winding N2 of triode Q3, the emitter of triode Q2 connects the emitter of triode Q3 and the control utmost point of synchronous rectifier SR1, and the collector electrode of triode Q3 connects the positive pole of diode D2.
6. the synchronous rectification driving circuit that is applicable to voltage multiplying rectifier as claimed in claim 2 is characterized in that also being provided with a mistake Drive Protecting Circuit between the drain-source utmost point of each synchronous rectifier.
7. the synchronous rectification driving circuit that is applicable to voltage multiplying rectifier as claimed in claim 6, it is characterized in that described mistake Drive Protecting Circuit is made up of resistance R 5, diode D10 and triode Q7, the negative electrode of one terminating diode D10 of resistance R 5 and the drain electrode of synchronous rectifier SR1, the anode of another terminating diode D10 and the base stage of triode Q7; The collector electrode of triode Q7 connects driver element, and emitter connects the source electrode of synchronous rectifier SR1.
8. as any one described synchronous rectification driving circuit that is applicable to voltage multiplying rectifier of claim 1-4, it is characterized in that described driving self-powered circuit comprises energy storage capacitor C3 and diode D3.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009201250723U CN201466998U (en) | 2009-07-20 | 2009-07-20 | Synchronous rectification driving circuit for voltage-multiplying rectification |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009201250723U CN201466998U (en) | 2009-07-20 | 2009-07-20 | Synchronous rectification driving circuit for voltage-multiplying rectification |
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| CN201466998U true CN201466998U (en) | 2010-05-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101488719B (en) * | 2009-03-05 | 2011-06-29 | 英飞特电子（杭州）有限公司 | Synchronous rectifying driver circuit suitable for voltage-multiplying rectifying |
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2009
- 2009-07-20 CN CN2009201250723U patent/CN201466998U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101488719B (en) * | 2009-03-05 | 2011-06-29 | 英飞特电子（杭州）有限公司 | Synchronous rectifying driver circuit suitable for voltage-multiplying rectifying |
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Granted publication date: 20100512 Effective date of abandoning: 20090720 |