CN103904904A - Dual-voltage amplifying high-gain high-frequency rectifying isolating converter - Google Patents

Dual-voltage amplifying high-gain high-frequency rectifying isolating converter Download PDF

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Publication number
CN103904904A
CN103904904A CN201410154889.9A CN201410154889A CN103904904A CN 103904904 A CN103904904 A CN 103904904A CN 201410154889 A CN201410154889 A CN 201410154889A CN 103904904 A CN103904904 A CN 103904904A
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China
Prior art keywords
diode
circuit
frequency
gain
rectifying
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CN201410154889.9A
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Inventor
吴红飞
夏天
邢岩
许�鹏
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Nanjing University of Aeronautics and Astronautics
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Nanjing University of Aeronautics and Astronautics
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Abstract

The invention discloses a dual-voltage amplifying high-gain high-frequency rectifying isolating converter and belongs to the technical field of power electronic converters. The dual-voltage amplifying high-gain high-frequency rectifying isolating converter is composed of a primary circuit, a transformer and a rectifying circuit. The rectifying circuit is composed of four diodes, two switch tubes, two auxiliary capacitors, two output filter capacitors, a high-frequency inductor and a load. According to the dual-voltage amplifying high-gain high-frequency rectifying isolating converter, a rectifying circuit has the controllable boosting and rectifying ability through the high-frequency inductor and the switch tubes, an embedded voltage amplifying rectifying circuit is formed through the auxiliary capacitors and the diodes, and a voltage amplifying output circuit is formed through the two output capacitors; in this way, the dual-voltage amplifying high-gain high-frequency rectifying isolating converter has the high-gain boosting and rectifying ability, soft switching of all the switch tubes and the diodes is achieved by the rectifying isolating converter through the high-frequency inductor, switching loss can be effectively reduced, efficiency can be improved, and the dual-voltage amplifying high-gain high-frequency rectifying isolating converter is particularly suitable for efficient high-gain isolating boosting direct-current power conversion occasions.

Description

Double pressure high-gain high-frequency rectification isolated converter
Technical field
The present invention relates to a kind of double pressure high-gain high-frequency rectification isolated converter, belong to converters technical field, especially belong to isolated DC-direct current energy converter technique field.
Background technology
In the application of the technical fields such as medical treatment, automobile, Aeronautics and Astronautics and renewable energy power generation, for the purpose of safety and in order to meet the demand of voltage, conventionally need to adopt isolation boosting DC converter.How to promote isolated converter voltage gain, to reduce the voltage stress of converter device used and realize high efficiency power conversion be the Important Problems that this technical field is paid close attention to always.
Traditional isolated DC transducer is realized various boost functions by the no-load voltage ratio of adjusting transformer, but, the no-load voltage ratio that transformer is adjusted in simple dependence realizes boosting and has following problem: the voltage stress of switching device is high, and particularly the voltage stress of converter secondary rectifier diode is far above output voltage; Transformer leakage inductance increase, cause due to voltage spikes and the concussion of switching device, further aggravated switching device stress, reduced reliability and efficiency.In addition, traditional isolated DC transducer can not be realized the soft switch of all switching devices, particularly transformer secondary device conventionally, has affected greatly the efficiency of converter.
Current mode isolated converter is one of Typical solutions of isolation boosting converter, as accompanying drawing 1, this scheme is placed in booster circuit in the former limit circuit of isolated converter, duty ratio by by-pass cock pipe can realize isolation boosting function, this scheme can effectively reduce the number of turn of Transformer Winding, and rectifier diode is directly output voltage clamp, voltage stress is lower.But, its subject matter is that the voltage stress of former limit switching tube is too high, and when particularly switching tube turn-offs, transformer leakage inductance etc. can cause great due to voltage spikes, has a strong impact on the normal operation of converter, therefore must add suitable active or passive snubber, cause circuit complexity.In addition, boost although this circuit arrangement can be realized, boost capability is limited, and switching tube can not realize soft switch, and 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-isolation boosting circuit is placed in to the secondary of isolated buck converter, realize isolation boosting function with this.The subject matter of this scheme is that rectification circuit, the non-isolation boosting circuit etc. of transformer secondary are all hard switchings, and need to be through two stage power conversion from being input to output, and this all can reduce the whole efficiency of converter greatly.
Summary of the invention
The object of the invention is for the deficiencies in the prior art, for isolation boosting power conversion occasion provides a kind of double pressure high-gain high-frequency rectification isolated converter.
The object of the invention is to be achieved through the following technical solutions:
Described double pressure high-gain high-frequency rectification isolated converter is made up of former limit circuit (10), transformer (T) and rectification circuit (20), and wherein transformer (T) comprises a secondary winding (N s) and a former limit winding (N p), rectification circuit (20) is by high-frequency inductor (L h), the first switching tube (S 1), second switch pipe (S 2), the first auxiliary capacitor (C a1), the second auxiliary capacitor (C a2), the first diode (D 1), the second diode (D 2), the 3rd diode (D 3), the 4th diode (D 4), the first output filter capacitor (C o1), the second output filter capacitor (C o2) and load (R o) composition; Described transformer (T) secondary winding (N s) one end be connected in high-frequency inductor (L h) one end, high-frequency inductor (L h) the other end be connected in the first switching tube (S 1) drain electrode, the anode of the first diode (D1), the second diode (D 2) negative electrode, the first output filter capacitor (C o1) one end and the second output filter capacitor (C o2) one end, the first diode (D 1) negative electrode be connected in the first auxiliary capacitor (C a1) one end and the 3rd diode (D 3) anode, the 3rd diode (D 3) negative electrode be connected in the first output filter capacitor (C o1) the other end and load (R o) one end, load (R o) the other end be connected in the second output filter capacitor (C o2) the other end and the 4th diode (D 4) anode, the 4th diode (D 4) negative electrode be connected in the second auxiliary capacitor (C o2) one end and the second diode (D 2) anode, the second auxiliary capacitor (C a2) the other end be connected in the first auxiliary capacitor (C a1) the other end, second switch pipe (S 2) drain electrode and transformer (T) secondary winding (N s) the other end, second switch pipe (S 2) source electrode be connected in the first switching tube (S 1) source electrode.
The former limit winding (N of described former limit circuit (10) and transformer (T) p) two ends be connected, the effect of former limit circuit (10) is that to produce positive negative pulse stuffing width be respectively 50% ac square wave voltage, and is put on transformer (T) former limit winding (N p) two ends.In order to achieve this end, described former limit circuit (10) can be the circuit topologies such as full-bridge type, semibridge system.
The essential distinction of technical solution of the present invention and existing technical scheme is, booster circuit has been integrated in the high-frequency rectification circuit of isolated converter, and has realized high step-up ratio by dual voltage doubling rectifing circuit.
The present invention has following beneficial effect:
(1) rectification circuit itself can be realized boost function, has effectively reduced the number of turn of house transformer winding, thereby can significantly reduce transformer leakage inductance, improve efficiency;
(2) can realize high voltage gain by dual times of laminated structure, this can further reduce the number of turn of required Transformer Winding;
(3) all switching tubes, diode constant power device can both be realized soft switch, and conversion efficiency is high;
(4) all switching tubes, diode constant power device can both be realized voltage clamp naturally, and device voltage stress is low.
Accompanying drawing explanation
Accompanying drawing 1 is traditional electrical flow pattern isolation boosting converter principle figure;
Accompanying drawing 2 is the double pressure high-gain of the present invention high-frequency rectification isolated converter schematic diagrams;
Accompanying drawing 3 is double pressure high-gain high-frequency isolation converter principle figure that the former limit of the present invention adopts full-bridge circuit topology;
Accompanying drawing 4 is double pressure high-gain high-frequency isolation converter principle figure that the former limit of the present invention adopts half-bridge circuit topology;
Accompanying drawing 5 is groundwork oscillograms that former limit adopts the double pressure high-gain high-frequency isolation converter of full-bridge circuit topology;
Accompanying drawing 6~9th, former limit adopts the double pressure high-gain high-frequency isolation converter of full-bridge circuit topology at the equivalent circuit diagram of each switch mode;
Designation in above accompanying drawing: 10 is former limit circuit; 20 is rectification circuit; T is transformer; N pand N sbe respectively former limit winding and the secondary winding of transformer (T); L hfor high-frequency inductor; S 1and S 2be respectively first, second switching tube; D 1, D 2, D 3and D 4be respectively first, second, third and the 4th diode; C a1and C a2be respectively the first and second auxiliary capacitors; C o1and C o2be respectively the first and second output filter capacitors; R ofor load; U ofor output voltage; U infor input source; L 1, L 2for inductance; S p1, S p2, S p3and S p4for switching tube; C 1and C 2for electric capacity; u nPfor the voltage at winding two ends, the former limit of transformer (T); i lHfor the electric current of high-frequency inductor; u gSP1, u gSP2, u gSP3and u gSP4be respectively switching tube S p1, S p2, S p3and S p4driving voltage; u gS1and u gS2be respectively the driving voltage of the first and second switching tubes; t 0, t 1, t 2, t 3and t 4for the time.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is elaborated.
As shown in Figure 2, described double pressure high-gain high-frequency rectification isolated converter is made up of former limit circuit (10), transformer (T) and rectification circuit (20), and wherein transformer (T) comprises a secondary winding (N s) and a former limit winding (N p), rectification circuit (20) is by high-frequency inductor (L h), the first switching tube (S 1), second switch pipe (S 2), the first auxiliary capacitor (C a1), the second auxiliary capacitor (C a2), the first diode (D 1), the second diode (D 2), the 3rd diode (D 3), the 4th diode (D 4), the first output filter capacitor (C o1), the second output filter capacitor (C o2) and load (R o) composition; Described transformer (T) secondary winding (N s) one end be connected in high-frequency inductor (L h) one end, high-frequency inductor (L h) the other end be connected in the first switching tube (S 1) drain electrode, the first diode (D 1) anode, the second diode (D 2) negative electrode, the first output filter capacitor (C o1) one end and the second output filter capacitor (C o2) one end, the first diode (D 1) negative electrode be connected in the first auxiliary capacitor (C a1) one end and the 3rd diode (D 3) anode, the 3rd diode (D 3) negative electrode be connected in the first output filter capacitor (C o1) the other end and load (R o) one end, load (R o) the other end be connected in the second output filter capacitor (C o2) the other end and the 4th diode (D 4) anode, the 4th diode (D 4) negative electrode be connected in the second auxiliary capacitor (C a2) one end and the second diode (D 2) anode, the second auxiliary capacitor (C a2) the other end be connected in the first auxiliary capacitor (C a1) the other end, second switch pipe (S 2) drain electrode and transformer (T) secondary winding (N s) the other end, second switch pipe (S 2) source electrode be connected in the first switching tube (S 1) source electrode.
In the present invention, the former limit winding (N of described former limit circuit (10) and transformer (T) p) two ends be connected, the effect of former limit circuit (10) is that to produce positive negative pulse stuffing width be respectively 50% ac square wave voltage, and is put on transformer (T) former limit winding (N p) two ends.In order to achieve this end, former limit circuit (10) has multiple circuit topology available, for example, can be the circuit topologies such as full-bridge type, semibridge system.Double pressure high-gain high-frequency rectification isolated converter schematic diagram when accompanying drawing 3 has provided former limit circuit (10) employing full bridge circuit topology, limit, figure Central Plains circuit comprises input source (U in) and four switching tube (S p1, S p2, S p3and S p4), four switching tubes form full-bridge circuit structure, the mid point of two switch brachium pontis and transformer (T) former limit winding (N p) two ends be connected.Double pressure high-gain high-frequency rectification isolated converter schematic diagram when accompanying drawing 4 has provided former limit circuit employing half bridge circuit topology, limit, figure Central Plains circuit comprises input source (U in), two switching tube (S p1, S p2) and two electric capacity (C 1and C 2).
The object of the invention is to realize high efficiency isolation boosting conversion, in order to realize this object, the present invention has been placed in booster circuit the rectification circuit of isolated converter, and boost by the high-frequency inductor in rectification circuit and common realization of switching tube, and improve boost capability by double laminated structure, this can significantly reduce Transformer Winding the number of turn, reduce stresses of parts, raise the efficiency.
Adopt the double pressure high-gain high-frequency rectification isolated converter of full bridge circuit topology as example take the former limit shown in accompanying drawing 3 below, operation principle of the present invention is described.Accompanying drawing 5 has provided the groundwork waveform of the double pressure high-gain high-frequency rectification isolated converter of former limit employing full bridge circuit topology.
T 0before moment, former limit switching tube S p2and S p3conducting, full-bridge circuit applies the former limit winding (N of negative voltage at transformer (T) p), high-frequency inductor (L h) in electric current be negative value, the second diode (D 2) conducting, input source (U in) through transformer (T) and high-frequency inductor (L h) to the second auxiliary capacitor (C a2) charging, simultaneously the 3rd diode (D 3) conducting, input source (U in) through transformer (T), high-frequency inductor (L h) and the first auxiliary capacitor (C a1) provide power to load; t 0moment, former limit switching tube S p2and S p3turn-off, due to high-frequency inductor (L h) electric current can not suddenly change, and reflexes to transformer (T) former limit winding (N p) electric current flow through former limit switching tube S p1and S p4body diode, be S p1and S p4no-voltage the condition that provides is provided, be applied to transformer (T) former limit winding (N simultaneously p) voltage become on the occasion of, high-frequency inductor (L h) current value start linearity and reduce, this mode equivalent electric circuit is as shown in Figure 6.
T 1moment, former limit switching tube S p1and S p4no-voltage is open-minded, and this mode equivalent electric circuit as shown in Figure 7.
T 2moment, high-frequency inductor (L h) electric current be reduced to zero, the second diode (D 2) and the 3rd diode (D 3) zero-current switching, due to the first switching tube (S 1) in opening state, high-frequency inductor (L h) through the first switching tube (S1) and second switch pipe (S 2) body diode conducting, high-frequency inductor (L h) the linear rising of electric current, this mode equivalent electric circuit is as shown in Figure 8.
T 3moment, the first switching tube (S 1) turn-off the first diode (D 1) and the 4th diode (D 4) conducting, input source (U in) through transformer (T), high-frequency inductor (L h) and the first diode (D1) to the first auxiliary capacitor (C a1) charging, the second auxiliary capacitor (C a2) electric discharge, and and high-frequency inductor (L h) provide power to load together.
T 4in the moment, lower half switch periods starts, and the course of work is similar, no longer repeated description.
Known according to the description of the above-mentioned course of work, the present invention can realize the soft switch of all switching tubes, diode, can effectively improve conversion efficiency.

Claims (3)

1. a double pressure high-gain high-frequency rectification isolated converter, is characterized in that:
Described double pressure high-gain high-frequency rectification isolated converter is made up of former limit circuit (10), transformer (T) and rectification circuit (20), and wherein transformer (T) comprises a secondary winding (N s) and a former limit winding (N p), rectification circuit (20) is by high-frequency inductor (L h), the first switching tube (S 1), second switch pipe (S 2), the first auxiliary capacitor (C a1), the second auxiliary capacitor (C a2), the first diode (D 1), the second diode (D 2), the 3rd diode (D 3), the 4th diode (D 4), the first output filter capacitor (C o1), the second output filter capacitor (C o2) and load (R o) composition;
Described transformer (T) secondary winding (N s) one end be connected in high-frequency inductor (L h) one end, high-frequency inductor (L h) the other end be connected in the first switching tube (S 1) drain electrode, the first diode (D 1) anode, the second diode (D 2) negative electrode, the first output filter capacitor (C o1) one end and the second output filter capacitor (C o2) one end, the first diode (D 1) negative electrode be connected in the first auxiliary capacitor (C a1) one end and the 3rd diode (D 3) anode, the 3rd diode (D 3) negative electrode be connected in the first output filter capacitor (C o1) the other end and load (R o) one end, load (R o) the other end be connected in the second output filter capacitor (C o2) the other end and the 4th diode (D 4) anode, the 4th diode (D 4) negative electrode be connected in the second auxiliary capacitor (C a2) one end and the second diode (D 2) anode, the second auxiliary capacitor (C a2) the other end be connected in the first auxiliary capacitor (c a1) the other end, second switch pipe (S 2) drain electrode and transformer (T) secondary winding (N s) the other end, second switch pipe (S 2) source electrode be connected in the first switching tube (S 1) source electrode.
2. double pressure high-gain high-frequency rectification isolated converter according to claim 1, is characterized in that: the former limit winding (N of described former limit circuit (10) and transformer (T) p) two ends be connected, it is respectively that 50% ac square wave voltage puts on transformer (T) former limit winding (N that described former limit circuit (10) produces positive negative pulse stuffing width p) two ends.
3. double pressure high-gain high-frequency rectification isolated converter according to claim 1, is characterized in that: described former limit circuit (10) can be the circuit topologies such as full-bridge type, semibridge system.
CN201410154889.9A 2014-04-17 2014-04-17 Dual-voltage amplifying high-gain high-frequency rectifying isolating converter Pending CN103904904A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107171576A (en) * 2017-06-09 2017-09-15 上海科技大学 A kind of voltage doubling rectifing circuit and its application in resonance isolated converter
US10224827B1 (en) 2018-02-15 2019-03-05 Futurewei Technologies, Inc. Power converter with wide DC voltage range
CN111624446A (en) * 2020-05-12 2020-09-04 西安交通大学 Passive earth electric wave sensor based on radio frequency energy collection
CN112087139A (en) * 2019-06-12 2020-12-15 台达电子工业股份有限公司 Isolated converter with high step-up ratio
CN112087150A (en) * 2019-06-12 2020-12-15 台达电子工业股份有限公司 Isolated boost converter

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CN103595258A (en) * 2013-11-28 2014-02-19 南京航空航天大学 Boost type soft switching resonant converter and frequency fixing control method thereof

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CN103208927A (en) * 2013-05-07 2013-07-17 南京航空航天大学 Disconnecting soft switching high-boost direct-current converter and control method thereof
CN103391009A (en) * 2013-07-18 2013-11-13 厦门大学 High-gain isolated type direct current-direct current (DC-DC) convertor
CN103595258A (en) * 2013-11-28 2014-02-19 南京航空航天大学 Boost type soft switching resonant converter and frequency fixing control method thereof

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107171576A (en) * 2017-06-09 2017-09-15 上海科技大学 A kind of voltage doubling rectifing circuit and its application in resonance isolated converter
US10224827B1 (en) 2018-02-15 2019-03-05 Futurewei Technologies, Inc. Power converter with wide DC voltage range
CN112087139A (en) * 2019-06-12 2020-12-15 台达电子工业股份有限公司 Isolated converter with high step-up ratio
CN112087150A (en) * 2019-06-12 2020-12-15 台达电子工业股份有限公司 Isolated boost converter
CN112087150B (en) * 2019-06-12 2022-02-18 台达电子工业股份有限公司 Isolated boost converter
CN111624446A (en) * 2020-05-12 2020-09-04 西安交通大学 Passive earth electric wave sensor based on radio frequency energy collection

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Application publication date: 20140702