CN104201894B - Voltage-multiplying high frequency rectification isolated transformer based on switched capacitors - Google Patents

Voltage-multiplying high frequency rectification isolated transformer based on switched capacitors Download PDF

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CN104201894B
CN104201894B CN201410485737.7A CN201410485737A CN104201894B CN 104201894 B CN104201894 B CN 104201894B CN 201410485737 A CN201410485737 A CN 201410485737A CN 104201894 B CN104201894 B CN 104201894B
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transformer
circuit
voltage
output filter
switch pipe
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CN104201894A (en
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陆杨军
吴红飞
葛红娟
邢岩
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Nanjing University of Aeronautics and Astronautics
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Nanjing University of Aeronautics and Astronautics
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

The invention discloses a voltage-multiplying high frequency rectification isolated transformer based on switched capacitors and belongs to the technical field of power electronic converters. The voltage-multiplying high frequency rectification isolated transformer comprises a primary circuit, a transformer and a rectifier circuit; the rectifier circuit is composed of two diodes, two switch tubes, two auxiliary capacitors, two output filter capacitors, a high-frequency inductor and a load. The high-frequency inductor and the switch tubes impart controllable boosting and rectifying capacities to the rectifier circuit, and the auxiliary capacitors form a switched capacitor circuit so that the boosting capacity of the rectifier circuit is improved. The voltage-multiplying high frequency rectification isolated transformer has the advantages that the rectifier circuit is imparted the high boosting capacity, soft on and off of all switch tubes is achieved, switching loss is effectively reduced, switching efficiency is improved, and the converter is especially suitable for efficient high-gain isolated boosting direct-current power conversions.

Description

A kind of many multiplication of voltages high-frequency rectification isolated converter based on switching capacity
Technical field
The present invention relates to a kind of many multiplication of voltages high-gain high-frequency rectification isolated converter, belong to converters technology neck Domain, especially belongs to isolated DC-direct current energy converter technique field.
Background technology
In the application of the technical fields such as renewable energy power generation, Aeronautics and Astronautics, automobile and medical treatment, for safety Consider and in order to meet the demand of voltage, it usually needs using isolation boosting DC converter.How to lift isolated converter Voltage gain, reduce the voltage stress of device used by converter and realize high efficiency power conversion and be always this technical field institute The Important Problems of concern.
Traditional isolated DC transducer realizes various boost functions by the no-load voltage ratio adjusting transformer, but, single The pure no-load voltage ratio relying on adjustment transformer, to realize boosting there is problems in that the voltage stress of switching device is high, particularly converts The voltage stress of device secondary commutation diode is far above output voltage;Transformer leakage inductance increases, and causes the voltage point of switching device Peak and concussion, have been further exacerbated by the stress of switching device, have reduced reliability and efficiency.Additionally, traditional isolated DC Converter generally can not realize the Sofe Switch of all switching devices, particularly transformer secondary device, strong influence conversion The efficiency of device.
Current mode isolated converter is one of Typical solutions of isolation boosting converter, such as accompanying drawing 1, and the program will rise Volt circuit is placed in the primary circuit of isolated converter, can realize isolation boosting function by the dutycycle adjusting switching tube, should Scheme can effectively reduce the number of turn of Transformer Winding, and it is relatively low that commutation diode is directly output voltage clamp, voltage stress.So And, its subject matter is that the voltage stress of primary side switch pipe is too high, and when particularly switching tube turns off, transformer leakage inductance etc. can draw Play great due to voltage spikes, have a strong impact on the normal operation of converter it is therefore necessary to add suitably active or passive absorption electricity Road, leads to circuit complicated.Additionally, although this circuit arrangement can be realized boosting, boost capability is limited, and switching tube can not Realize Sofe Switch, conversion efficiency is also affected.
Document " chuan yao, xinbo ruan, xuehua wang, chi k.tse.isolated buck-boost dc/dc converters suitable for wide input-voltage range[j].ieee transactions On power electronics, 2011,26 (9): 2599-2613. " non-isolated booster circuit is placed in isolated buck converter Secondary, after being connected to rectification circuit output end, isolation boosting function is realized with this.The subject matter of the program is transformation The rectification circuit of device secondary, non-isolated booster circuit etc. are all hard switchings, and need through two stage power from being input to output Conversion, this all can greatly be lost the whole efficiency of converter.
Content of the invention
The purpose of the present invention is for the deficiencies in the prior art, provides a kind of being based on to open for isolation boosting power conversion occasion Close many multiplication of voltages high-frequency rectification isolated converter of electric capacity.
The purpose of the present invention is achieved through the following technical solutions:
Described many multiplication of voltages high-frequency rectification isolated converter based on switching capacity by primary circuit (10), transformer (t) and Rectification circuit (20) is constituted, and wherein transformer (t) comprises a vice-side winding (ns) and a primary side winding (np), rectification circuit (20) by high-frequency inductor (lh), first switch pipe (s1), second switch pipe (s2), the first auxiliary capacitor (ca1), the second auxiliary capacitor (ca2), the first diode (d1), the second diode (d2), the first output filter capacitor (co1), the second output filter capacitor (co2) With load (ro) composition;Described transformer (t) vice-side winding (ns) one end be connected in high-frequency inductor (lh) one end, high-frequency inductor (lh) the other end be connected in the first auxiliary capacitor (ca1) one end, the first auxiliary capacitor (ca1) the other end be connected in first switch pipe (s1) drain electrode, second switch pipe (s2) source electrode and the second auxiliary capacitor (ca2) one end, first switch pipe (s1) source electrode even In the first output filter capacitor (co1) one end, load (ro) one end and transformer (t) vice-side winding (ns) the other end, Two switching tube (s2) drain electrode be connected in the first output filter capacitor (co1) the other end, the second output filter capacitor (co2) one end With the first diode (d1) anode, the second auxiliary capacitor (ca2) the other end be connected in the first diode (d1) negative electrode and second Diode (d2) anode, the second diode (d2) negative electrode be connected in the second output filter capacitor (co2) the other end and load (ro) the other end.
Described primary circuit (10) and the primary side winding (n of transformer (t)p) two ends be connected, the work of primary circuit (10) With being to produce the ac square wave voltage that positive negative pulse stuffing width is respectively 50%, and apply to transformer (t) primary side winding (np) two ends.In order to realize this purpose, described primary circuit (10) can be the circuit topology such as full-bridge type, semibridge system.
Technical solution of the present invention is with the essential distinction of existing technical scheme, and booster circuit has been integrated into isolated variable In the high-frequency rectification circuit of device, and high step-up ratio is realized by switched-capacitor circuit, this not only can effectively reduce stresses of parts, Lifting step-up ratio, and be capable of the Sofe Switch of all switching tubes, improve conversion efficiency.
The invention has the following beneficial effects:
(1) rectification circuit is capable of boost function in itself, efficiently reduces the number of turn of house transformer winding, thus Transformer leakage inductance can significantly be reduced, improve efficiency;
(2) voltage gain can be greatly improved by switched-capacitor circuit, this can reduce further required transformer around The number of turn of group;
(3) all switching tubes can realize Sofe Switch, and conversion efficiency is high;
(4) all switching tubes, the power device of diode can realize voltage clamp naturally, and device voltage stress is low.
Brief description
Accompanying drawing 1 is conventional current type isolation boosting converter principle figure;
Accompanying drawing 2 is many multiplication of voltages high-frequency rectification converter principle figure based on switching capacity for the present invention;
Accompanying drawing 3 is the many multiplication of voltages high-frequency rectification converter based on switching capacity that former limit of the present invention adopts full-bridge circuit topology Schematic diagram;
Accompanying drawing 4 is the many multiplication of voltages high-frequency rectification converter based on switching capacity that former limit of the present invention adopts half-bridge circuit topology Schematic diagram;
Accompanying drawing 5 is the main of the many multiplication of voltages high-frequency rectification converter based on switching capacity that former limit adopts full-bridge circuit topology Working waveform figure;
Accompanying drawing 6~9 is that former limit adopts the many multiplication of voltages high-frequency rectification converter based on switching capacity of full-bridge circuit topology to exist Each equivalent circuit diagram switching mode;
Designation in the figures above: 10 is primary circuit;20 is rectification circuit;T is transformer;npAnd nsIt is respectively The primary side winding of transformer (t) and vice-side winding;lhFor high-frequency inductor;s1And s2It is respectively first, second switching tube;d1And d2Point Wei not the first and second diodes;ca1And ca2It is respectively the first and second auxiliary capacitors;co1And co2It is respectively first and second defeated Go out filter capacitor;roFor load;uoFor output voltage;uinFor input source;l1、l2For inductance, d3、d4For diode;coFor output Filter capacitor;sp1、sp2、sp3And sp4For switching tube;cin1And cin2For electric capacity;unpElectricity for transformer (t) primary side winding two ends Pressure;ilhElectric current for high-frequency inductor;ugsp1、ugsp2、ugsp3And ugsp4It is respectively switching tube sp1、sp2、sp2And sp4Driving voltage; ugs1And ugs2It is respectively the first and second switching tube (s1And s2) driving voltage;udsp4And uds2It is switching tube s respectivelyp4With second Switching tube (s2) drain electrode and source electrode between voltage;isp1、isp2、isp3And isp4It is respectively and flow into switching tube sp1、sp2、sp3With sp4The electric current of drain electrode;t0、t1、t2、t3、t4And t5For the time.
Specific embodiment
Below in conjunction with the accompanying drawings technical scheme is described in detail.
As shown in Figure 2, described many multiplication of voltages high-frequency rectification isolated converter based on switching capacity by primary circuit (10), Transformer (t) and rectification circuit (20) are constituted, and wherein transformer (t) comprises a vice-side winding (ns) and a primary side winding (np), rectification circuit (20) is by high-frequency inductor (lh), first switch pipe (s1), second switch pipe (s2), the first auxiliary capacitor (ca1), the second auxiliary capacitor (ca2), the first diode (d1), the second diode (d2), the first output filter capacitor (co1), second Output filter capacitor (co2) and load (ro) composition;Described transformer (t) vice-side winding (ns) one end be connected in high-frequency inductor (lh) One end, high-frequency inductor (lh) the other end be connected in the first auxiliary capacitor (ca1) one end, the first auxiliary capacitor (ca1) another End is connected in first switch pipe (s1) drain electrode, second switch pipe (s2) source electrode and the second auxiliary capacitor (ca2) one end, first Switching tube (s1) source electrode be connected in the first output filter capacitor (co1) one end, load (ro) one end and transformer (t) secondary Winding (ns) the other end, second switch pipe (s2) drain electrode be connected in the first output filter capacitor (co1) the other end, second defeated Go out filter capacitor (co2) one end and the first diode (d1) anode, the second auxiliary capacitor (ca2) the other end be connected in the one or two Pole pipe (d1) negative electrode and the second diode (d2) anode, the second diode (d2) negative electrode be connected in the second output filter capacitor (co2) the other end and load (ro) the other end.
In the present invention, the primary side winding (n of described primary circuit (10) and transformer (t)p) two ends be connected, former limit electricity The effect on road (10) is to produce the ac square wave voltage that positive negative pulse stuffing width is respectively 50%, and applies to transformer (t) Primary side winding (np) two ends.In order to realize this purpose, primary circuit (10) has multiple circuit topologies available, for example, It can be the circuit topology such as full-bridge type, semibridge system.Accompanying drawing 3 gives primary circuit (10) and adopts base during full bridge circuit topology In many multiplication of voltages high-gain high-frequency rectification isolated converter schematic diagram of switching capacity, in figure primary circuit includes input source (uin) and Four switching tube (sp1、sp2、sp3And sp4), four switching tubes form full-bridge circuit structure, the midpoint of two switch brachium pontis and transformation Device (t) primary side winding (np) two ends be connected.Accompanying drawing 4 give primary circuit adopt half bridge circuit topology when based on switch Many multiplication of voltages high-gain high-frequency rectification isolated converter schematic diagram of electric capacity, in figure primary circuit includes input source (uin), two open Close pipe (sp1、sp2) and two electric capacity (cin1And cin2).
The purpose of the present invention is to realize efficient isolation boosting conversion, and in order to realize this purpose, the present invention will rise piezoelectricity In the creative rectification circuit being placed in isolated converter in road and common by the high-frequency inductor in rectification circuit and switching tube Realize boosting, and to improve boost capability by switched-capacitor circuit, this can significantly reduce the number of turn, the reduction of Transformer Winding Stresses of parts, raising efficiency.
Adopt the many multiplication of voltages high-gain based on switching capacity of full bridge circuit topology high with the former limit shown in accompanying drawing 3 below As a example frequency rectification isolated converter, the operation principle of the present invention is described.Accompanying drawing 5 gives former limit and adopts full bridge circuit topology The key operation waveforms of the many multiplication of voltages high-gain high-frequency rectification isolated converter based on switching capacity.
t0Before moment, primary side switch pipe sp2And sp3Conducting, full-bridge circuit apply negative voltage transformer (t) former limit around Group (np), high-frequency inductor (lh) in electric current be negative value, first switch pipe (s1) and the first diode (d1) conducting, input source (uin) through transformer (t) and high-frequency inductor (lh) to the first auxiliary capacitor (ca1) charge, the first output filter capacitor (co1) to Two auxiliary capacitor (ca2) charge;t0Moment, primary side switch pipe sp2And sp3Turn off, due to high-frequency inductor (lh) electric current can not be mutated, Reflex to transformer (t) primary side winding (np) electric current flow through primary side switch pipe sp1And sp4Body diode, be sp1And sp4Zero Voltage opens offer condition, is applied simultaneously to transformer (t) primary side winding (np) voltage be changed on the occasion of high-frequency inductor (lh) Current value starts linearly to reduce, and this mode equivalent circuit is as shown in Figure 6.
t1Moment, switching tube sp1And sp4No-voltage is open-minded, and this mode equivalent circuit is as shown in Figure 7.
t2Moment, high-frequency inductor lhElectric current natural commutation.
t3Moment, first switch pipe (s1) turn off, high-frequency inductor (lh) electric current flows through second switch pipe (s2) body two pole Pipe, is s2No-voltage offer condition, input source (u are providedin) through transformer (t), high-frequency inductor (lh), second switch pipe (s2) Body diode and the first auxiliary capacitor (ca1) to the first output filter capacitor (co1) charge, the second diode (d simultaneously2) lead Logical, the second auxiliary capacitor (ca2) to the second output filter capacitor (co2) charge, this mode equivalent circuit is as shown in Figure 8.
t4Moment, second switch pipe (s2) no-voltage is open-minded, this mode equivalent circuit is as shown in Figure 9.
t5In the moment, lower half switch periods start, and the course of work is similar to, and are not repeated to describe.
According to the description of the above-mentioned course of work, the present invention can realize the Sofe Switch of all switching tubes, can be effective Improve conversion efficiency.

Claims (3)

1. the many multiplication of voltages high-frequency rectification isolated converter based on switching capacity it is characterised in that:
Described many multiplication of voltages high-frequency rectification isolated converter based on switching capacity is by primary circuit (10), transformer (t) and rectification Circuit (20) is constituted, and wherein transformer (t) comprises a vice-side winding (ns) and a primary side winding (np), rectification circuit (20) By high-frequency inductor (lh), first switch pipe (s1), second switch pipe (s2), the first auxiliary capacitor (ca1), the second auxiliary capacitor (ca2), the first diode (d1), the second diode (d2), the first output filter capacitor (co1), the second output filter capacitor (co2) With load (ro) composition;
Described transformer (t) vice-side winding (ns) one end be connected in high-frequency inductor (lh) one end, high-frequency inductor (lh) the other end It is connected in the first auxiliary capacitor (ca1) one end, the first auxiliary capacitor (ca1) the other end be connected in first switch pipe (s1) drain electrode, Second switch pipe (s2) source electrode and the second auxiliary capacitor (ca2) one end, first switch pipe (s1) source electrode be connected in the first output Filter capacitor (co1) one end, load (ro) one end and transformer (t) vice-side winding (ns) the other end, second switch pipe (s2) drain electrode be connected in the first output filter capacitor (co1) the other end, the second output filter capacitor (co2) one end and the one or two Pole pipe (d1) anode, the second auxiliary capacitor (ca2) the other end be connected in the first diode (d1) negative electrode and the second diode (d2) anode, the second diode (d2) negative electrode be connected in the second output filter capacitor (co2) the other end and load (ro) another One end.
2. the many multiplication of voltages high-frequency rectification isolated converter based on switching capacity according to claim 1 it is characterised in that: institute State the primary side winding (n of primary circuit (10) and transformer (t)p) two ends be connected, described primary circuit (10) produces positive and negative arteries and veins Rush the ac square wave voltage that width is respectively 50% and put on transformer (t) primary side winding (np) two ends.
3. the many multiplication of voltages high-frequency rectification isolated converter based on switching capacity according to claim 1 it is characterised in that: institute Stating primary circuit (10) is full-bridge type or half bridge circuit topology.
CN201410485737.7A 2014-09-18 2014-09-18 Voltage-multiplying high frequency rectification isolated transformer based on switched capacitors Active CN104201894B (en)

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CN106877657A (en) * 2017-03-22 2017-06-20 天津大学 The fuel cell imported quasi- Z source switches capacitance boost DC converter of wide scope

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CN103887987A (en) * 2014-04-17 2014-06-25 南京航空航天大学 Multiple voltage-multiplying high-gain high-frequency rectification isolation converter based on switched capacitor
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