CN201690364U - Circuit for preventing current flowing backwards - Google Patents
Circuit for preventing current flowing backwards Download PDFInfo
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- CN201690364U CN201690364U CN201020199282XU CN201020199282U CN201690364U CN 201690364 U CN201690364 U CN 201690364U CN 201020199282X U CN201020199282X U CN 201020199282XU CN 201020199282 U CN201020199282 U CN 201020199282U CN 201690364 U CN201690364 U CN 201690364U
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- Y—GENERAL 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
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- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies 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 utility model relates to a circuit for preventing current flowing backwards when synchronous rectifying converters are in synchronous rectification and parallel operation. The circuit comprises a synchronous rectifying driving circuit, a power supply control circuit, a sampling circuit and a voltage comparison circuit. The sampling circuit outputs voltage signals to a first input end of the voltage comparison circuit, the power supply control circuit receives the output signals from the voltage comparison circuit and controls the synchronous rectifying driving circuit, the power supply control circuit is further connected with a control end of a synchronous rectifying tube of the synchronous rectifying driving circuit, the sampling circuit is coupled with a main-side winding or a secondary-side winding or an output inductor of a transformer of a second converter in the converters, and a second input end of the voltage comparison voltage receives output voltage from a first converter. The synchronous rectifying converters does not cause output voltage pit and overshoot when in parallel operation, and are high in efficiency and low in loss.
Description
Technical field
The utility model relates to a kind of anti-circuit of irritating of electric current that prevents, relates in particular to a kind of DC-DC of being used for synchronous rectifier converter and prevent the anti-circuit of irritating of electric current when parallel operation plays machine.
Background technology
Along with the increase of converter bearing power, the parallel operation of system requirements converter moves so that bigger power output is provided, and load-sharing electric current between the converter is to reduce the current stress of each converter.Simultaneously, the converter of parallel operation operation is easy to realize electric power system redundancy backup and hot plug, to improve the reliability of system.At present, the method of converter parallel operation generally is that the output at converter adds isolating diode or isolates MOSFET and simply realize exporting parallel operation and redundancy backup, this method is simple and reliable, be applied extensively, circuit diagram sees Figure 10 and Figure 11 for details, wherein Figure 10 is for adopting the parallel operation circuit theory diagrams of diode-isolated, the parallel operation circuit theory diagrams of Figure 11 for adopting metal-oxide-semiconductor to isolate, but there is significant disadvantages in above two kinds of methods: obviously in the low-voltage, high-current converter, isolating diode pressure drop effect is obvious, loss is very big, and this method is difficult to be used for the parallel operation operation of the converter of low-voltage, high-current.Even if use metal-oxide-semiconductor to replace isolating diode, certain power consumption is still arranged, transducer effciency is descended, and cost increase control circuit complexity, reliability reduction.As seen not only the high control of cost is complicated to use isolating diode or metal-oxide-semiconductor to realize parallel operation and redundancy backup in the low-voltage, high-current converter, and reliability and feasibility are all poor.
Simultaneously along with computer, development of Communication Technique, the extensive use of low-voltage, high-current Switching Power Supply, require more and more higher to converter, high-power, small size, high efficiency become the development trend of converter, and this development trend has exactly been complied with in the appearance of synchronous rectification, it can improve the efficient of converter greatly, reduces the damage of thermal stress to power supply, improves the reliability of power supply.
Therefore wishing has a kind of converter to can be good at realizing two kinds of functions; Output does not need to adopt isolating device to isolate during first converter parallel operation operation; The second converter using synchronous rectification.The high efficiency requirement of converter can either be satisfied like this and simultaneously converter can be satisfied again the parallel operation requirement.Accompanying drawing 12 is synchronous rectifier converter parallel operation circuit theory diagrams.
But when parallel operation is used on the converter of employing synchronous rectification,, play the machine failure when parallel operation, even the problem of converter damage because the intrinsic two-way admittance characteristic of synchronous rectification MOS transistor exists output voltage that pit is arranged.Concrete reason is analyzed as follows:
During converter output parallel operation, at first play first converter of machine and set up output voltage, give the output capacitance charging of the converter of other parallel operation simultaneously, impel the output of other converters to have output voltage.When second converter plays machine, because the effect of Voltage loop and soft start, duty ratio D is an ascending process that increases gradually, promptly this moment, 1-D was bigger, and it is long that synchronous rectifier is in the state time of opening, and voltage is added on the synchronous rectifier of opening on the parallel operation bus, a big electric current will be returned through inductance L, the anti-filling of synchronous rectifier, consequently cause busbar voltage to be fallen, output voltage had pit when converter played machine, even converter damages.
In the existing patented technology similar control circuit is arranged also, Chinese patent as the patent No.: ZL 200410022451.1, but there is following shortcoming in this patent: when the converter isolated operation, because the reference voltage Vref in its comparison circuit is a fixed value, during the machine of rising, this control circuit action, the rectifying tube drive signal is closed, converter relies on the body diode rectification of synchronous rectifier, when treating boost voltage greater than reference voltage Vref, control circuit cuts out, and the synchronous rectifier operate as normal can cause output voltage that pit or overshoot phenomenon are arranged in the process of this conversion.
Summary of the invention
Purpose of the present invention is exactly will solve in the synchronous rectifier converter of prior art and the machine technology to exist output voltage that pit is arranged, overshoot phenomenon, thereby caused the machine failure, problems such as converter damage, a kind of anti-circuit of irritating of electric current when preventing the synchronous rectifier converter parallel operation is provided, comprise synchronous rectification driving circuit, power-supplying circuit, sample circuit and voltage comparator circuit, described sample circuit outputs voltage signal to the first input end of described voltage comparator circuit, described power-supplying circuit receives from the output signal of voltage comparator circuit and controls described synchronous rectification driving circuit, described power-supplying circuit also is connected with the control end of the synchronous rectifier of described synchronous rectification driving circuit, the take a sample output voltage of first converter in the described converter of described sample circuit, second input of described voltage comparator circuit receives the output busbar voltage of described first converter.
The beneficial effects of the utility model are: the utility model is by the bus output voltage of taking a sample, the situation of change of reflecting voltage in real time, thereby control that can be in good time, no-output voltage pit, overshoot phenomenon when making synchronous rectifier converter parallel operation operation, the transducer effciency height, loss is little.
Further, by controlling outer synchronous cooperation of driving power supply circuits power supply and synchronous rectifier driving, the operating state of rectifying tube can be the metal-oxide-semiconductor rectification by diode rectification transition stably when synchronous rectifier converter parallel operation of the present utility model moved, thereby thoroughly solve the machine that rises in advance when having the synchronous rectifier converter parallel operation now, output voltage pit, even problem such as converter damage.
Description of drawings
Fig. 1 is the circuit theory diagrams of first kind of embodiment of the utility model;
Fig. 2 is the embodiment of Fig. 1 circuit theory diagrams when crystal drive circuit is not worked outside crystal drive circuit power supply VCC turn-offs outside synchronous rectification;
Fig. 3 is the circuit theory diagrams of second kind of embodiment of the utility model;
Fig. 4 is the synchronous rectification driving voltage and the control signal oscillogram of second kind of embodiment of the utility model;
Fig. 5 is the circuit theory diagrams of the third embodiment of the utility model;
Fig. 6 is the circuit theory diagrams of the 4th kind of embodiment of the utility model;
Fig. 7 is the circuit theory diagrams of the 5th kind of embodiment of the utility model;
Fig. 8 is the circuit theory diagrams of the 6th kind of embodiment of the utility model;
Fig. 9 is the circuit theory diagrams of the 7th kind of embodiment of the utility model;
Figure 10 is the circuit theory diagrams of output series connection isolating diode when having the converter parallel operation now;
Figure 11 is the circuit theory diagrams that metal-oxide-semiconductor is isolated in the output series connection when having the converter parallel operation now;
Figure 12 is that existing synchronous rectifier converter does not adopt isolating device parallel operation circuit theory diagrams.
Embodiment
Also in conjunction with the accompanying drawings the utility model is described in further details below by preferred embodiment.
Embodiment one
Fig. 1 is the circuit diagram of first embodiment of the utility model.Should outer drive all-wave synchronous rectification counnter attack filling circuit comprises: synchronous outer crystal drive circuit power-supplying circuit I, boost voltage VCC1 and output busbar voltage+Vo comparison circuit II are from the outputting inductance coupling generation boost voltage III of converter, crystal drive circuit IV outside the synchronous rectification.The Q1 of triode described in Fig. 1, Q2, Q3 can be triodes, also metal-oxide-semiconductor.
The operation principle of driving synchronous rectification counnter attack filling circuit outward is as follows: produce boost voltage VCC1 from the outputting inductance coupling of converter, this boost voltage VCC1 can be real-time fully the variation of this converter output voltage V of reflection o, can be formulated as VCC1=K*Vo, wherein K is the ratio of the accessory power supply number of turn and the inductance number of turn, is constant.Output busbar voltage+Vo, the voltage status of response transform device output that can be real-time.The voltage status of converter output terminal can be divided into: during state one, converter parallel operation operation, when another converter has played machine, output voltage exists, promptly exports busbar voltage+Vo and is the output setting voltage; When state two, converter isolated operation, when converter did not also play machine work, output voltage did not exist, and promptly exporting busbar voltage+Vo is 0.
When the converter parallel operation moves, first converter has played machine, output voltage exists, promptly exporting busbar voltage+Vo exists, when second converter played machine, VCC1 voltage began to increase by zero, exported the bigger voltage difference of existence between busbar voltage+Vo and the boost voltage VCC1 this moment, triode Q1 is in conducting state, voltage is provided for triode Q2 base stage, triode Q2 conducting, triode Q3 ends, the outer crystal drive circuit power supply VCC of synchronous rectification turn-offs, outer crystal drive circuit is not worked, and synchronous rectifier does not have driving voltage and turn-offs, and synchronous rectifier is by diode rectification in the body, be equivalent to diode rectification, as shown in Figure 2, this moment, electric current flow through the body diode D4 and the D5 of metal-oxide-semiconductor, came rectification by D4 and D5, because of the unidirectional on state characteristic of diode, the anti-phenomenon of irritating of no current when this situation downconverter plays machine.When the converter output voltage rises near the parallel operation busbar voltage, it is very little that export between busbar voltage+Vo and the boost voltage VCC1 voltage difference this moment, triode Q1 ends, but because the existence of capacitor C 2 time-delays, triode Q2 continues to keep conducting a period of time, triode Q3 continues to end, when output voltage V o rises to busbar voltage fully, triode Q2 ends, triode Q3 conducting, outer crystal drive circuit power supply VCC is open-minded in synchronous rectification, outer crystal drive circuit work, and synchronous rectifier begins that driving is arranged, synchronous rectifier becomes the metal-oxide-semiconductor rectification fully by diode rectification, because converter output voltage V o is the same with the output busbar voltage, eliminate the anti-phenomenon of irritating of output current fully at this moment, thoroughly solved output voltage pit when having the synchronous rectifier converter parallel operation now, overshoot, even problem such as converter damage.
When the converter isolated operation, before converter played machine, output busbar voltage+Vo did not exist, and promptly exporting busbar voltage+Vo is 0; There is not voltage difference between output busbar voltage+Vo and the boost voltage VCC1 during machine of rising, transistor Q1 ends, transistor Q2 base stage no-voltage ends, transistor Q3 is a conducting state, synchronous rectification outer crystal drive circuit power supply VCC directly give drive circuitry, circuit of synchronous rectification immediately enters into metal-oxide-semiconductor synchronous rectification state, changed into the problem of the output voltage pit that the metal-oxide-semiconductor rectification causes in output voltage overshoot that diode rectification causes in the body when having avoided machine and the output voltage uphill process by diode rectification in the body.
Embodiment two
Fig. 3 is the circuit theory diagrams of second kind of embodiment of the present utility model.The difference of itself and embodiment one is: use the power-supplying circuit I among the described embodiment of Fig. 1 instead another kind of synchronous rectification and drive control circuit outward, it comprises driving transformer T2, diode (D3, D4), metal-oxide-semiconductor field effect transistor (Q2, Q3, Q4), resistance (R2, R3, R6) and capacitor C 3; The end of described driving transformer T2 is connected with the grid of the anode of diode D3 and metal-oxide-semiconductor field effect transistor Q4, and the other end is connected with the anode of diode D4 and the grid of metal-oxide-semiconductor field effect transistor Q2; One end of the negative electrode of described diode (D3, D4), capacitor C 3, resistance (R3, R6) links together; The drain electrode of described metal-oxide-semiconductor field effect transistor Q4 is connected with the other end of resistance R 3; The drain electrode of described metal-oxide-semiconductor field effect transistor Q2 is connected with the other end of resistance R 6; The drain electrode of described metal-oxide-semiconductor field effect transistor Q3 is connected with the other end of capacitor C 3, and the grid of described metal-oxide-semiconductor field effect transistor Q3 is connected with resistance R 2; The source electrode of the intermediate ends of described driving transformer T2, metal-oxide-semiconductor field effect transistor (Q2, Q3, Q4) and the other end of resistance R 2 are connected with ground wire respectively; This circuit reaches the purpose of half synchronous rectification by the waveform of control break driving voltage when parallel operation, drive voltage signal is become the drive waveforms of having only rectification and not having afterflow, thereby prevents the anti-purpose of irritating of electric current when reaching parallel operation.Particularly be: when the converter parallel operation moves, first converter has played machine, output busbar voltage+Vo exists, when second converter plays machine, boost voltage VCC1 voltage begins to increase by zero, export the bigger voltage difference of existence between busbar voltage+Vo and the boost voltage VCC1 this moment, transistor Q1 is in conducting state, transistor Q3 ends, the voltage of 3 couples of diode D3 of capacitor C, D4 rectification does not have filter action, the Ua of this point voltage waveform and transformer T2 and Ub signal Synchronization, the Ua signal of driving transformer T2 behind transistor Q4, the synthetic US2 drive signal that obtains; The Ub signal of driving transformer T2 synthetic obtains the US1 drive signal behind transistor Q2, timing waveform is seen the t0-t1 period among Fig. 4.This drive waveforms is just in time identical with the voltage waveform Ut of transformer, synchronous rectifier S1 and S2 conducting rectification when transformer has voltage like this, when transformer voltage is zero, synchronous rectifier turn-offs simultaneously, rely on diode continuousing flow in the body, export and do not have the negative sense path in the energy storage inductor this moment, plays the anti-effect of irritating of output current that prevents.When converter output voltage V o rises near the parallel operation busbar voltage, it is very little that export between busbar voltage+Vo and the boost voltage VCC1 voltage difference this moment, transistor Q1 ends, transistor Q3 conducting, 3 couples of diode D3 of capacitor C, the voltage of D4 rectification plays filter action, producing a galvanic current presses, the Ua signal of driving transformer T2 is through transistor Q4, the synthetic US2 drive signal that obtains, the Ub signal of driving transformer T2 is behind transistor Q2, synthetic obtain the US1 drive signal, timing waveform is seen the time period t 2-t3 among Fig. 4, synchronous rectifier S1 and S2 conducting rectification when transformer has voltage like this, when transformer voltage is zero, the also corresponding conducting of synchronous rectifier, the inductance afterflow realizes complete synchronous rectification.
Embodiment three
Fig. 5 is the third embodiment of the present utility model, and the difference of itself and embodiment one is: in the parallel operation start-up phase, the outer voltage that drives of the second transducer synchronous rectification continued flow tube is turn-offed, thereby prevent the anti-purpose of irritating of electric current when reaching parallel operation.
Embodiment four
Fig. 6 is the circuit theory diagrams of the 4th kind of embodiment of the utility model.The difference of itself and embodiment one is: in the parallel operation start-up phase, the self-powered voltage of the second transducer synchronous rectification continued flow tube is turn-offed, thereby prevent the anti-purpose of irritating of electric current when reaching parallel operation.
Embodiment five
Fig. 7 is the circuit theory diagrams of the 5th kind of embodiment of the utility model, and the difference of itself and embodiment one is: use voltage comparator circuit II among the described embodiment of Fig. 1 instead the circuit that is made of the operational amplifier circuit of making comparisons.
Embodiment six
Fig. 8 is the 6th kind of embodiment of the utility model, and the difference of itself and embodiment one is: use the sample circuit III among the described embodiment of Fig. 1 instead main transformer accessory power supply potential circuit.
Embodiment seven
Fig. 9 is the 7th kind of embodiment of the utility model, the difference of itself and embodiment one is: use the power-supplying circuit I among the described embodiment of Fig. 1 instead another kind of synchronous rectification and drive power-supplying circuit outward, it comprises resistance R 2, R4, capacitor C 2 and metal-oxide-semiconductor field effect transistor Q2, Q3, the two ends of described resistance R 2 connect described resistance R 4 and capacitor C 2 respectively, a bit being connected with the output of described voltage comparator circuit respectively in addition of described resistance R 4 and capacitor C 2, drain electrode and the described resistance R 2 of described MOS effect pipe Q2, the common port of capacitor C 2 connects, source electrode connects grid and described resistance R 2 in the source electrode of described metal-oxide-semiconductor field effect transistor Q3, the common port of R4 connects; The drain electrode of described metal-oxide-semiconductor field effect transistor Q3 connects the output bus (also can connect the edges generating line of first converter or the bus of main transformer certainly) of first converter.
Above content is in conjunction with specifically implementing embodiment to further describing that the utility model is done, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, under the prerequisite that does not break away from the utility model design, can also make some simple deduction or replace, all should be considered as belonging to protection range of the present utility model.
Claims (10)
1. anti-circuit of irritating of electric current when preventing the synchronous rectifier converter parallel operation, comprise synchronous rectification driving circuit, power-supplying circuit, sample circuit and voltage comparator circuit, described sample circuit outputs voltage signal to the first input end of described voltage comparator circuit, described power-supplying circuit receives from the output signal of voltage comparator circuit and controls described synchronous rectification driving circuit, described power-supplying circuit also is connected with the control end of the synchronous rectifier of described synchronous rectification driving circuit, it is characterized in that: the former limit of the transformer of second converter or secondary or outputting inductance coupling in described sample circuit and the described converter, second input of described voltage comparator circuit receives the output voltage of described first converter.
2. a kind of anti-circuit of irritating of electric current when preventing the synchronous rectifier converter parallel operation as claimed in claim 1, it is characterized in that: described sample circuit comprises resistance R 1, capacitor C 1, inductance L 1-B and diode D1, is connected in parallel with described resistance R 1, capacitor C 1 after the positive pole of described inductance L 1-B and diode D1 is connected in series.
3. a kind of anti-circuit of irritating of electric current when preventing the synchronous rectifier converter parallel operation as claimed in claim 1 or 2, it is characterized in that: described synchronous rectification driving circuit is synchronous rectification external drive circuit or synchronous commutation self-driving circuit; Described voltage comparator circuit comprises resistance R 5, Xiao Te diode Z1 and the diode D2 that is connected in series successively, also comprise triode Q1, the anode of described diode D2 is connected with the anode of described Xiao Te diode Z1, negative electrode receives the output voltage signal from sample circuit, the other end of described resistance R 5 connects the voltage output end of described first converter, and the collector electrode of described triode Q1 connects the common port that voltage output end, base stage that the input of described power-supplying circuit, emitter connect described first converter connect described resistance R 5 and Xiao Te diode Z1.
4. a kind of anti-circuit of irritating of electric current when preventing the synchronous rectifier converter parallel operation as claimed in claim 1 or 2, it is characterized in that: described synchronous rectification driving circuit is the synchronous rectification external drive circuit, comprise driving transformer T2, diode (D3, D4), metal-oxide-semiconductor field effect transistor (Q2, Q3, Q4), resistance (R2, R3, R6) and capacitor C 3; The end of described driving transformer T2 is connected with the grid of the anode of diode D3 and metal-oxide-semiconductor field effect transistor Q4, and the other end is connected with the anode of diode D4 and the grid of metal-oxide-semiconductor field effect transistor Q2; One end of the negative electrode of described diode (D3, D4), capacitor C 3, resistance (R3, R6) links together; The drain electrode of described metal-oxide-semiconductor field effect transistor Q4 is connected with the other end of resistance R 3; The drain electrode of described metal-oxide-semiconductor field effect transistor Q2 is connected with the other end of resistance R 6; The drain electrode of described metal-oxide-semiconductor field effect transistor Q3 is connected with the other end of capacitor C 3, and the grid of described metal-oxide-semiconductor field effect transistor Q3 is connected with resistance R 2; The source electrode of the intermediate ends of described driving transformer T2, metal-oxide-semiconductor field effect transistor (Q2, Q3, Q4) and the other end of resistance R 2 are connected with ground wire respectively.
5. a kind of anti-circuit of irritating of electric current when preventing the synchronous rectifier converter parallel operation as claimed in claim 3, it is characterized in that, described synchronous rectification external drive circuit comprises: driving transformer T2, diode (D3, D4), metal-oxide-semiconductor field effect transistor (Q2, Q3, Q4), resistance (R2, R3, R6) and capacitor C 3; The end of described driving transformer T2 is connected with the grid of the anode of diode D3 and metal-oxide-semiconductor field effect transistor Q4, and the other end is connected with the anode of diode D4 and the grid of metal-oxide-semiconductor field effect transistor Q2; One end of the negative electrode of described diode (D3, D4), capacitor C 3, resistance (R3, R6) links together; The drain electrode of described metal-oxide-semiconductor field effect transistor Q4 is connected with the other end of resistance R 3; The drain electrode of described metal-oxide-semiconductor field effect transistor Q2 is connected with the other end of resistance R 6; The drain electrode of described metal-oxide-semiconductor field effect transistor Q3 is connected with the other end of capacitor C 3, and the grid of described metal-oxide-semiconductor field effect transistor Q3 is connected with resistance R 2; The source electrode of the intermediate ends of described driving transformer T2, metal-oxide-semiconductor field effect transistor (Q2, Q3, Q4) and the other end of resistance R 2 are connected with ground wire respectively.
6. a kind of anti-circuit of irritating of electric current when preventing the synchronous rectifier converter parallel operation as claimed in claim 3 is characterized in that: outer crystal drive circuit of synchronous rectification or synchronous rectification self-driving circuit that described synchronous rectification driving circuit comprises the PWM drive signal generation unit and is attached thereto.
7. a kind of anti-circuit of irritating of electric current when preventing the synchronous rectifier converter parallel operation as claimed in claim 4 is characterized in that: outer crystal drive circuit of synchronous rectification or synchronous rectification self-driving circuit that described synchronous rectification driving circuit comprises the PWM drive signal generation unit and is attached thereto.
8. a kind of anti-circuit of irritating of electric current when preventing the synchronous rectifier converter parallel operation as claimed in claim 4, it is characterized in that: described voltage comparator circuit is the comparator that is made of operational amplifier, comprise operational amplifier, resistance R 3 and resistance R 5 ', described resistance R 3 and resistance R 5 ' be connected in series, resistance R 1 in the other end of resistance R 3 and the described sample circuit, the common port of capacitor C 1 connects, resistance R 5 ' the other end connect the voltage output end of described first converter, the in-phase input end of described operational amplifier and described resistance R 3 and resistance R 5 ' common port be connected, inverting input receives the output voltage signal from sample circuit, output is connected with the input of described power-supplying circuit; Outer crystal drive circuit of synchronous rectification or synchronous rectification self-driving circuit that described synchronous rectification driving circuit comprises the PWM drive signal generation unit and is attached thereto.
9. a kind of anti-circuit of irritating of electric current when preventing the synchronous rectifier converter parallel operation as claimed in claim 4, it is characterized in that: described voltage comparator circuit is the comparator that is made of operational amplifier, comprise operational amplifier, resistance R 3 and resistance R 5 ', described resistance R 3 and resistance R 5 ' be connected in series, resistance R 1 in the other end of resistance R 3 and the described sample circuit, the common port of capacitor C 1 connects, resistance R 5 ' the other end connect the voltage output end of described first converter, the in-phase input end of described operational amplifier and described resistance R 3 and resistance R 5 ' common port be connected, inverting input receives the output voltage signal from sample circuit, output is connected with the input of described power-supplying circuit; Outer crystal drive circuit of synchronous rectification or synchronous rectification self-driving circuit that described synchronous rectification driving circuit comprises the PWM drive signal generation unit and is attached thereto.
10. a kind of anti-circuit of irritating of electric current when preventing the synchronous rectifier converter parallel operation as claimed in claim 4, it is characterized in that: described voltage comparator circuit is the comparator that is made of operational amplifier, comprise operational amplifier, resistance R 3 and resistance R 5 ', described resistance R 3 and resistance R 5 ' be connected in series, resistance R 1 in the other end of resistance R 3 and the described sample circuit, the common port of capacitor C 1 connects, resistance R 5 ' the other end connect the voltage output end of described first converter, the in-phase input end of described operational amplifier and described resistance R 3 and resistance R 5 ' common port be connected, inverting input receives the output voltage signal from sample circuit, output is connected with the input of described power-supplying circuit; Outer crystal drive circuit of synchronous rectification or synchronous rectification self-driving circuit that described synchronous rectification driving circuit comprises the PWM drive signal generation unit and is attached thereto; Outer crystal drive circuit of synchronous rectification or synchronous rectification self-driving circuit that described synchronous rectification driving circuit comprises the PWM drive signal generation unit and is attached thereto.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020199282XU CN201690364U (en) | 2010-05-21 | 2010-05-21 | Circuit for preventing current flowing backwards |
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| CN201020199282XU CN201690364U (en) | 2010-05-21 | 2010-05-21 | Circuit for preventing current flowing backwards |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102255287A (en) * | 2011-07-26 | 2011-11-23 | 深圳市核达中远通电源技术有限公司 | Circuit for preventing current from flowing backwards |
| CN103138240A (en) * | 2013-02-22 | 2013-06-05 | 华为技术有限公司 | Backward-flowing current prevention circuit, backward-flowing current prevention method and power supply system |
| CN103296893A (en) * | 2013-05-09 | 2013-09-11 | 嘉善中正电子科技有限公司 | Active clamping forward-and-flyback circuit capable of starting or stopping synchronous rectification |
| CN103887973A (en) * | 2012-12-24 | 2014-06-25 | 中兴通讯股份有限公司 | Method and system controlling reverse current to generate power tube voltage stress |
| WO2015197031A1 (en) * | 2014-06-27 | 2015-12-30 | Byd Company Limited | Synchronous rectifier circuit and llc resonance converter having the same |
| WO2016023275A1 (en) * | 2014-08-13 | 2016-02-18 | 中兴通讯股份有限公司 | Current control method and circuit, power converter and computer storage medium |
| CN107482917A (en) * | 2016-06-08 | 2017-12-15 | 马小林 | The integrated three port power converters of one kind |
| CN110535353A (en) * | 2019-10-18 | 2019-12-03 | 上海军陶电源设备有限公司 | Self-powered synchronous rectification adjusts circuit and switch power supply system |
| CN111865090A (en) * | 2020-07-16 | 2020-10-30 | 北京卫星制造厂有限公司 | Secondary synchronous rectification control circuit and method based on primary current sampling |
| CN113162419A (en) * | 2021-03-24 | 2021-07-23 | 西安微电子技术研究所 | Light-load circulating current suppression circuit based on peak current control |
| CN113872177A (en) * | 2021-10-14 | 2021-12-31 | 上海军陶科技股份有限公司 | Anti-reverse-filling circuit based on field effect transistor |
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- 2010-05-21 CN CN201020199282XU patent/CN201690364U/en not_active Expired - Lifetime
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102255287A (en) * | 2011-07-26 | 2011-11-23 | 深圳市核达中远通电源技术有限公司 | Circuit for preventing current from flowing backwards |
| CN103887973A (en) * | 2012-12-24 | 2014-06-25 | 中兴通讯股份有限公司 | Method and system controlling reverse current to generate power tube voltage stress |
| CN103887973B (en) * | 2012-12-24 | 2018-07-06 | 中兴通讯股份有限公司 | Reverse irrigated current is controlled to generate the method and system of power tube voltage stress |
| CN103138240A (en) * | 2013-02-22 | 2013-06-05 | 华为技术有限公司 | Backward-flowing current prevention circuit, backward-flowing current prevention method and power supply system |
| CN103138240B (en) * | 2013-02-22 | 2016-03-30 | 华为技术有限公司 | Current circuit is filled with in counnter attack, current methods and electric power system are filled with in counnter attack |
| CN103296893A (en) * | 2013-05-09 | 2013-09-11 | 嘉善中正电子科技有限公司 | Active clamping forward-and-flyback circuit capable of starting or stopping synchronous rectification |
| CN105207457B (en) * | 2014-06-27 | 2019-03-29 | 比亚迪股份有限公司 | Circuit of synchronous rectification and LLC resonant converter with it |
| WO2015197031A1 (en) * | 2014-06-27 | 2015-12-30 | Byd Company Limited | Synchronous rectifier circuit and llc resonance converter having the same |
| CN105207457A (en) * | 2014-06-27 | 2015-12-30 | 比亚迪股份有限公司 | Synchronous rectification circuit and LLC resonance converter possessing the synchronous rectification circuit |
| WO2016023275A1 (en) * | 2014-08-13 | 2016-02-18 | 中兴通讯股份有限公司 | Current control method and circuit, power converter and computer storage medium |
| CN107482917A (en) * | 2016-06-08 | 2017-12-15 | 马小林 | The integrated three port power converters of one kind |
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| CN110535353A (en) * | 2019-10-18 | 2019-12-03 | 上海军陶电源设备有限公司 | Self-powered synchronous rectification adjusts circuit and switch power supply system |
| CN111865090A (en) * | 2020-07-16 | 2020-10-30 | 北京卫星制造厂有限公司 | Secondary synchronous rectification control circuit and method based on primary current sampling |
| CN111865090B (en) * | 2020-07-16 | 2022-01-04 | 北京卫星制造厂有限公司 | Secondary synchronous rectification control circuit and method based on primary current sampling |
| CN113162419A (en) * | 2021-03-24 | 2021-07-23 | 西安微电子技术研究所 | Light-load circulating current suppression circuit based on peak current control |
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