CN102035394A - Forward topology synchronous rectification driver circuit - Google Patents

Forward topology synchronous rectification driver circuit Download PDF

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Publication number
CN102035394A
CN102035394A CN2010105963303A CN201010596330A CN102035394A CN 102035394 A CN102035394 A CN 102035394A CN 2010105963303 A CN2010105963303 A CN 2010105963303A CN 201010596330 A CN201010596330 A CN 201010596330A CN 102035394 A CN102035394 A CN 102035394A
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transformer
tube
resistance
links
continued flow
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CN102035394B (en
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金祖敏
顾巍
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SHENZHEN SUPLET HYBRID INTEGRATED CIRCUIT CO Ltd
BEIJING SUPLET Co Ltd
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SHENZHEN SUPLET HYBRID INTEGRATED CIRCUIT CO Ltd
BEIJING SUPLET Co Ltd
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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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • 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 invention provides a forward topology synchronous rectification driver circuit comprising a rectifying tube Q3 and a follow current tube Q2, wherein the rectifying tube Q3 is connected between the secondary-side synonym end of a transformer and ground, and the follow current tube Q2 is connected between the secondary-side homonym end of the transformer and the ground; and an output inductor L1 is connected between the secondary-side homonym end of the transformer and the output end of a circuit. The driver circuit also comprises an auxiliary winding T1B of the transformer, wherein the synonym end of the auxiliary winding T1B of the transformer is connected with the cathode of a diode D1, the collector electrode of a triode VT1 and the public end of the first end of the auxiliary winding T1B of the transformer by a resistor R4; the second end of the resistor R2 is connected with the base electrode of the triode VT1 and the cathode of a stabilivolt D2 of which the anode is earthed by a resistor R5; the anode of the diode D1 is connected with the emission electrode of the triode VT1 and the first end of the resistor R1; the second end of the resistor R1 is connected with the grid electrode of the follow current tube Q2; and the homonym end of the auxiliary winding T1B of the transformer is connected with the output end of the circuit.

Description

A kind of forward topology synchronous rectification driving circuit
Technical field
The invention belongs to DC/DC power circuit field, relate in particular to a kind of drive circuit of forward topology synchronous rectification driving circuit.
Background technology
At present, the application of the power supply of the big electric current of output LOW voltage in the communications field is more and more wider, and this just requires higher power supply conversion efficiency.In order to keep the high efficiency of power source conversion, adopt the synchronous rectification of secondary usually.
Key in the synchronous rectification is a Driving technique.Using the widest mode now is the mode that self-powered or winding drive.Wherein the single-end ortho-exciting self-powered synchronous rectification topology that resets of electric capacity is simple because of its circuit, device is few, with low cost being used widely, particularly in middle low power and the limited power supply occasion of volume.In the Driving technique of this synchronous rectification, the drive signal of continued flow tube is from the resetting voltage of reset capacitance, the waveform of this resetting voltage is a parabolic type, when input voltage is higher, the duty ratio of whole power supply is less, to cause resetting voltage on-off state to occur, and then make that the driving voltage on the continued flow tube is approaching zero in the rear section of one-period, the driving deficiency that causes continued flow tube, the freewheel current of the inductance of this moment will be by the body diode of continued flow tube, this is that the power circuit conversion efficiency is low excessively, the main cause that continued flow tube damages also is the bottleneck that influences the reliability of this power circuit in application.Therefore, synchronous rectification driving circuit of the prior art is when change range of input voltage is big, and the conversion efficiency of entire circuit reduces, and damages device easily.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of forward topology synchronous rectification driving circuit, under the situation of the variation of input voltage any range, can both guarantee the job stability of entire circuit high conversion rate and device.
For achieving the above object, the invention provides a kind of synchronous rectification driving circuit of forward topology, comprise: be connected the secondary different name end of transformer T1A and the rectifying tube Q3 between the ground, and the continued flow tube Q2 between the secondary that is connected transformer T1A end of the same name and the ground, be connected with outputting inductance L1 between the output of the secondary of transformer T1A end of the same name and circuit; Described rectifying tube Q3 and continued flow tube Q2 all are field effect transistor, the grid of described rectifying tube Q3 links to each other with the secondary end of the same name of transformer T1A, the drain electrode of rectifying tube Q3 links to each other with the secondary different name end of transformer T1A, the source ground of rectifying tube Q3, the drain electrode of described continued flow tube Q2 links to each other the source ground of described continued flow tube Q2 with the secondary end of the same name of transformer T1A;
The auxiliary winding T1B that also comprises transformer T1A, the common port of the collector electrode of the negative electrode of the different name end of the auxiliary winding T1B of described transformer T1A by resistance R 4 and diode D1, triode VT1 and first end of resistance R 2 links to each other, second end of described resistance R 2 links to each other with the negative electrode of the base stage of triode VT1 and voltage-stabiliser tube D2, the anode of described voltage-stabiliser tube D2 is by resistance R 5 ground connection, the anode of described diode D1 is connected with the emitting stage of triode VT1 and first end of resistance R 1, and second end of described resistance R 1 is connected with the grid of continued flow tube Q2;
The auxiliary induction L1A that also comprises outputting inductance L1, the end of the same name of described auxiliary induction L1A links to each other with the anode of diode D3, different name end and the ground connection of auxiliary induction L1A, the negative electrode of described diode D3 links to each other with the end of the same name of the auxiliary winding T1B of described transformer T1A and first end of capacitor C 2, the second end ground connection of described capacitor C 2.
The present invention also provides the synchronous rectification driving circuit of another kind of forward topology, comprise: be connected the secondary different name end of transformer T1A and the rectifying tube Q3 between the ground, and the continued flow tube Q2 between the secondary that is connected transformer T1A end of the same name and the ground, be connected with outputting inductance L1 between the output of transformer secondary end of the same name and circuit; Described rectifying tube Q3 and continued flow tube Q2 all are field effect transistor, described rectifying tube Q3 and continued flow tube Q2 are field effect transistor, the grid of described rectifying tube Q3 links to each other with the secondary end of the same name of transformer T1A, the drain electrode of rectifying tube Q3 links to each other with the secondary different name end of transformer T1A, the source ground of rectifying tube Q3, the drain electrode of described continued flow tube Q2 links to each other the source ground of described continued flow tube Q2 with the secondary end of the same name of transformer T1A;
The auxiliary winding T1B that also comprises transformer T1A, the common port of the collector electrode of the negative electrode of the different name end of the auxiliary winding T1B of described transformer T1A by resistance R 4 and diode D1, triode VT1 and first end of resistance R 2 links to each other, second end of described resistance R 2 links to each other with the negative electrode of the base stage of triode VT1 and voltage-stabiliser tube D2, the anode of described voltage-stabiliser tube D2 is by resistance R 5 ground connection, the anode of described diode D1 is connected with the emitting stage of triode VT1 and first end of resistance R 1, and second end of described resistance R 1 is connected with the grid of continued flow tube Q2;
The end of the same name of the auxiliary winding T1B of described transformer T1A is connected with the output of circuit.
The synchronous rectification driving circuit of the forward topology that the embodiment of the invention provides, can avoid the problem of the driving deficiency of the original continued flow tube of former cause fully, guarantee continued flow tube reliably conducting under any state, no matter it is much that the excursion of input voltage has, circuit working is under the condition of any duty ratio.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the schematic diagram of an embodiment of the synchronous rectification driving circuit of forward topology provided by the invention;
Fig. 2 is the schematic diagram of another embodiment of the synchronous rectification driving circuit of forward topology provided by the invention;
Fig. 3 is the schematic diagram of another embodiment of the synchronous rectification driving circuit of forward topology provided by the invention;
Fig. 4 is the schematic diagram of another embodiment of the synchronous rectification driving circuit of forward topology provided by the invention.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer, below in conjunction with the accompanying drawing in the embodiment of the invention, technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
Fig. 1 is the schematic diagram of an embodiment of the synchronous rectification driving circuit of forward topology provided by the invention.As shown in Figure 1, in this embodiment, synchronous rectification driving circuit comprises the secondary different name end that is connected transformer T1A and the rectifying tube Q3 between the ground, and is connected the secondary end of the same name of transformer T1A and the continued flow tube Q2 between the ground.Be connected with outputting inductance L1 between the output of the secondary of transformer T1A end of the same name and circuit.Rectifying tube Q3 and continued flow tube Q2 all are field effect transistor, wherein, the grid of rectifying tube Q3 links to each other with the secondary end of the same name of transformer T1A, the drain electrode of rectifying tube Q3 links to each other with the secondary different name end of transformer T1A, the source ground of rectifying tube Q3, the grid of rectifying tube Q3 links to each other with the end secondary of the same name of transformer T1A; The drain electrode of continued flow tube Q2 links to each other the source ground of continued flow tube Q2 with the secondary end of the same name of transformer T1A.
Above-mentioned drive circuit also comprises the auxiliary winding T1B of transformer T1A, and the common port of the collector electrode of the negative electrode of the different name end of the auxiliary winding T1B of transformer T1A by resistance R 4 and diode D1, triode VT1 and first end of resistance R 2 links to each other.Second end of resistance R 2 links to each other with the negative electrode of the base stage of triode VT1 and voltage-stabiliser tube D2.The anode of voltage-stabiliser tube D2 is by resistance R 5 ground connection.The anode of diode D1 is connected with the emitting stage of triode VT1 and first end of resistance R 1.Second end of resistance R 1 is connected with the grid of continued flow tube Q2.
In the present embodiment, above-mentioned drive circuit also comprises the auxiliary induction L1A of outputting inductance L1, and the end of the same name of auxiliary induction L1A links to each other with the anode of diode D3, different name end and the ground connection of auxiliary induction L1A.The negative electrode of diode D3 links to each other with the end of the same name of the auxiliary winding T1B of transformer T1A and first end of capacitor C 2, the second end ground connection of capacitor C 2.
In addition, between the output of circuit and ground, can also be connected to capacitor C 3.
Be provided with reset capacitance C1, former limit switching tube Q1 and discharge resistance R1 in the former limit of transformer T1A one side.
In the synchronous rectification driving circuit in the present embodiment, rectifying tube Q3 adopts the self-powered mode, its drive signal is directly from the drain electrode of continued flow tube Q2, when the switching tube Q1 conducting of former limit, the secondary of transformer T1A end of the same name is a positive voltage, and this voltage is applied directly on the grid of rectifying tube Q3, makes rectifying tube Q3 conducting, this moment, transformer T1A provided energy by outputting inductance L1 and rectifying tube Q3 to output loading, and the linear rising of the electric current of outputting inductance L1.
When former limit switching tube Q1 turn-offed, rectifying tube Q3 turn-offed.This moment reset capacitance C1 by and the magnetizing inductance resonance on the former limit of transformer T1A realize the magnetic reset of transformer, during this period, on the resetting voltage on the reset capacitance C1 negative down just, be parabolic shape.Different name end on the auxiliary winding T1B of transformer is a positive voltage, can be designated as V T1B, negative just down on satisfying in the drawings.The voltage of the different name end on the auxiliary winding T1B and the voltage relation in direct ratio on the reset capacitance C1.The auxiliary winding L 1B of outputting inductance forms direct voltage V by the rectification of diode D3 on capacitor C 2 C2, the output voltage of this direct voltage and entire circuit relation in direct ratio.The voltage V of the different name end of the auxiliary winding T1B of transformer T1BWith the direct voltage V on the capacitor C 2 C2After the stack,, can be designated as V as the driving voltage of continued flow tube Q2 Q2_GSV Q2_GSBe applied on the grid of continued flow tube Q2 by resistance R 4 and R2, make continued flow tube Q2 conducting, the electric current of output cable L1 pass through continued flow tube Q2 and realize afterflow, the electric current on the outputting inductance L1 is linear to descend.
When the switching tube Q1 conducting of former limit, the voltage V of the auxiliary winding T1B of transformer T1BGo up negative down just, the voltage V on itself and the electric capacity C2Obtain a negative voltage after the stack, diode D2 conducting, by resistance R 2, R4 and R5 dividing potential drop, and this moment continued flow tube Q2 grid capacitance on electric charge discharge rapidly by diode D1, realize reliable turn-off.
This shows, during the magnetic reset of reset capacitance C2, the different name end of the auxiliary winding T1B of transformer is for just, and a positive direct voltage has superposeed, make the whole driving voltage that is added on the continued flow tube Q2 be raised, preferably the voltage difference of this lifting is designed to be higher than the turning-on voltage V of continued flow tube Q2 GS_th, then can avoid the problem of the driving deficiency of the original continued flow tube of former cause fully, guarantee continued flow tube reliably conducting under any state, much no matter the excursion of input voltage has, circuit working is under the condition of any duty ratio.
Need to prove that because the leakage inductance of transformer and the existence of various parasitic capacitances, by the coupling of transformer, the driving high voltage of continued flow tube Q2 can produce the product due to voltage spikes.Circuit working is under transient condition in addition, and transformer is assisted the voltage V of the different name end of winding T1B T1BAlso can produce higher transient voltage, and in the present embodiment, if be higher than the voltage stabilizing value of voltage-stabiliser tube D2 after the dividing potential drop of high transient state driving voltage by R4, R5 and R2, then the base voltage of triode VT1 will be clamped on the fixing value, by triode VT1, the driving voltage of continued flow tube Q2 also is clamped in the safety value.Therefore can think, resistance R 4, triode VT1, resistance R 2, resistance R 5 and voltage-stabiliser tube D2 have constituted clamp circuit.As mentioned above, this clamp circuit can effectively suppress the high voltage transient in the circuit, protection continued flow tube Q2, the stability of raising circuit.
In addition, can on continued flow tube Q2, produce a negative voltage in the drive circuit provided by the invention, because the existence of resistance R 5 and voltage-stabiliser tube D2, this negative voltage is clamped on the suitable value, can either guarantee the reliable turn-off of continued flow tube, can make that again the drive loss of afterflow is controlled at minimum value, suppress the generation of the driving negative sense high pressure of continued flow tube Q2 simultaneously, improve the conversion efficiency and the reliability of circuit.
Fig. 2 shows the schematic diagram of another embodiment of the synchronous rectification driving circuit of forward topology provided by the invention.As shown in Figure 2, the synchronous rectification driving circuit among this embodiment only is that with the difference of Fig. 1 the former limit main circuit of transformer is different, and promptly main circuit adopts active-clamp single-end ortho-exciting topology in Fig. 2.Particularly, be provided with reset capacitance C1, former limit switching tube Q1, discharge resistance R3 and clamper tube Q4 in the main circuit.
Fig. 3 shows the schematic diagram of another embodiment of the synchronous rectification driving circuit of forward topology provided by the invention.In the embodiment shown in Fig. 1 and Fig. 2, the direct voltage that superposes in the continued flow tube drive signal comes from outputting inductance L1, and in the present embodiment, the direct voltage that superposes in the continued flow tube drive signal is from output voltage.Below specify the specific implementation of present embodiment.
As shown in Figure 3, this synchronous rectification driving circuit comprises the secondary different name end that is connected transformer T1A and the rectifying tube Q3 between the ground, and is connected the secondary end of the same name of transformer T1A and the continued flow tube Q2 between the ground.Be connected with outputting inductance L1 between the output of the secondary of transformer T1A end of the same name and circuit.Rectifying tube Q3 and continued flow tube Q2 all are field effect transistor, wherein, the grid of rectifying tube Q3 links to each other with the secondary end of the same name of transformer T1A, the drain electrode of rectifying tube Q3 links to each other with the secondary different name end of transformer T1A, the source ground of rectifying tube Q3, the grid of rectifying tube Q3 links to each other with the end secondary of the same name of transformer T1A; The drain electrode of continued flow tube Q2 links to each other the source ground of continued flow tube Q2 with the secondary end of the same name of transformer T1A.
Above-mentioned drive circuit also comprises the auxiliary winding T1B of transformer T1A, and the common port of the collector electrode of the negative electrode of the different name end of the auxiliary winding T1B of transformer T1A by resistance R 4 and diode D1, triode VT1 and first end of resistance R 2 links to each other.Second end of resistance R 2 links to each other with the negative electrode of the base stage of triode VT1 and voltage-stabiliser tube D2.The anode of voltage-stabiliser tube D2 is by resistance R 5 ground connection.The anode of diode D1 is connected with the emitting stage of triode VT1 and first end of resistance R 1.Second end of resistance R 1 is connected with the grid of continued flow tube Q2.
The end of the same name of the auxiliary winding T1B of transformer T1A is connected with the output of circuit.
Similar among the operation principle of the synchronous rectification driving circuit shown in Fig. 3 and Fig. 1, it is reseting period at reset capacitance C2, the voltage of the different name end of the auxiliary winding T1B of transformer and output voltage stack can guarantee continued flow tube reliably conducting under free position equally.
Fig. 4 shows the schematic diagram of another embodiment of the synchronous rectification driving circuit of forward topology provided by the invention.As shown in Figure 4, the synchronous rectification driving circuit among this embodiment only is that with the difference of Fig. 3 the former limit main circuit of transformer is different, and promptly main circuit adopts active-clamp single-end ortho-exciting topology in Fig. 4.Particularly, be provided with reset capacitance C1, former limit switching tube Q1, discharge resistance R3 and clamper tube Q4 in the main circuit.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (2)

1. the synchronous rectification driving circuit of a forward topology, it is characterized in that, comprise: be connected the secondary different name end of transformer T1A and the rectifying tube Q3 between the ground, and the continued flow tube Q2 between the secondary that is connected transformer T1A end of the same name and the ground, be connected with outputting inductance L1 between the output of the secondary of transformer T1A end of the same name and circuit; Described rectifying tube Q3 and continued flow tube Q2 all are field effect transistor, the grid of described rectifying tube Q3 links to each other with the secondary end of the same name of transformer T1A, the drain electrode of rectifying tube Q3 links to each other with the secondary different name end of transformer T1A, the source ground of rectifying tube Q3, the drain electrode of described continued flow tube Q2 links to each other the source ground of described continued flow tube Q2 with the secondary end of the same name of transformer T1A;
The auxiliary winding T1B that also comprises transformer T1A, the common port of the collector electrode of the negative electrode of the different name end of the auxiliary winding T1B of described transformer T1A by resistance R 4 and diode D1, triode VT1 and first end of resistance R 2 links to each other, second end of described resistance R 2 links to each other with the negative electrode of the base stage of triode VT1 and voltage-stabiliser tube D2, the anode of described voltage-stabiliser tube D2 is by resistance R 5 ground connection, the anode of described diode D1 is connected with the emitting stage of triode VT1 and first end of resistance R 1, and second end of described resistance R 1 is connected with the grid of continued flow tube Q2;
The auxiliary induction L1A that also comprises outputting inductance L1, the end of the same name of described auxiliary induction L1A links to each other with the anode of diode D3, different name end and the ground connection of auxiliary induction L1A, the negative electrode of described diode D3 links to each other with the end of the same name of the auxiliary winding T1B of described transformer T1A and first end of capacitor C 2, the second end ground connection of described capacitor C 2.
2. the synchronous rectification driving circuit of a forward topology, it is characterized in that, comprise: be connected the secondary different name end of transformer T1A and the rectifying tube Q3 between the ground, and the continued flow tube Q2 between the secondary that is connected transformer T1A end of the same name and the ground, be connected with outputting inductance L1 between the output of transformer secondary end of the same name and circuit; Described rectifying tube Q3 and continued flow tube Q2 all are field effect transistor, described rectifying tube Q3 and continued flow tube Q2 are field effect transistor, the grid of described rectifying tube Q3 links to each other with the secondary end of the same name of transformer T1A, the drain electrode of rectifying tube Q3 links to each other with the secondary different name end of transformer T1A, the source ground of rectifying tube Q3, the drain electrode of described continued flow tube Q2 links to each other the source ground of described continued flow tube Q2 with the secondary end of the same name of transformer T1A;
The auxiliary winding T1B that also comprises transformer T1A, the common port of the collector electrode of the negative electrode of the different name end of the auxiliary winding T1B of described transformer T1A by resistance R 4 and diode D1, triode VT1 and first end of resistance R 2 links to each other, second end of described resistance R 2 links to each other with the negative electrode of the base stage of triode VT1 and voltage-stabiliser tube D2, the anode of described voltage-stabiliser tube D2 is by resistance R 5 ground connection, the anode of described diode D1 is connected with the emitting stage of triode VT1 and first end of resistance R 1, and second end of described resistance R 1 is connected with the grid of continued flow tube Q2;
The end of the same name of the auxiliary winding T1B of described transformer T1A is connected with the output of circuit.
CN2010105963303A 2010-12-20 2010-12-20 Forward topology synchronous rectification driver circuit Active CN102035394B (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102820794A (en) * 2012-08-27 2012-12-12 杭州电子科技大学 Power supply circuit using ultrasonic scalpel mainframe to output electric energy
WO2013174152A1 (en) * 2012-05-23 2013-11-28 华为技术有限公司 Synchronous rectification device and synchronous rectification power supply
CN105406715A (en) * 2014-09-15 2016-03-16 Tdk株式会社 Switching power supply unit
CN108075623A (en) * 2016-11-09 2018-05-25 致茂电子(苏州)有限公司 Clipping control unit
CN109347311A (en) * 2018-12-07 2019-02-15 广州金升阳科技有限公司 A kind of self-powered driving circuit of double tube positive exciting circuit of synchronous rectification
CN110880872A (en) * 2019-11-25 2020-03-13 深圳市英威腾电气股份有限公司 Bidirectional self-driven DC-DC converter

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JP2007124759A (en) * 2005-10-26 2007-05-17 Sanken Electric Co Ltd Dc converter
CN2924920Y (en) * 2006-07-19 2007-07-18 北京新雷能有限责任公司 Synchronous rectifier driving circuit
CN101686015A (en) * 2008-09-23 2010-03-31 台达电子工业股份有限公司 Forward-flyback converter with active clamping circuit

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6760236B2 (en) * 2002-09-04 2004-07-06 Chih-Hung Hsieh Third winding reset forward converter
JP2007124759A (en) * 2005-10-26 2007-05-17 Sanken Electric Co Ltd Dc converter
CN2924920Y (en) * 2006-07-19 2007-07-18 北京新雷能有限责任公司 Synchronous rectifier driving circuit
CN101686015A (en) * 2008-09-23 2010-03-31 台达电子工业股份有限公司 Forward-flyback converter with active clamping circuit

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013174152A1 (en) * 2012-05-23 2013-11-28 华为技术有限公司 Synchronous rectification device and synchronous rectification power supply
CN102820794A (en) * 2012-08-27 2012-12-12 杭州电子科技大学 Power supply circuit using ultrasonic scalpel mainframe to output electric energy
CN102820794B (en) * 2012-08-27 2015-05-20 杭州电子科技大学 Power supply circuit using ultrasonic scalpel mainframe to output electric energy
CN105406715A (en) * 2014-09-15 2016-03-16 Tdk株式会社 Switching power supply unit
CN105406715B (en) * 2014-09-15 2018-04-27 Tdk株式会社 Switching power unit
CN108075623A (en) * 2016-11-09 2018-05-25 致茂电子(苏州)有限公司 Clipping control unit
CN108075623B (en) * 2016-11-09 2020-04-21 致茂电子(苏州)有限公司 Clamping control circuit
CN109347311A (en) * 2018-12-07 2019-02-15 广州金升阳科技有限公司 A kind of self-powered driving circuit of double tube positive exciting circuit of synchronous rectification
CN110880872A (en) * 2019-11-25 2020-03-13 深圳市英威腾电气股份有限公司 Bidirectional self-driven DC-DC converter
CN110880872B (en) * 2019-11-25 2021-01-26 深圳市英威腾电气股份有限公司 Bidirectional self-driven DC-DC converter

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