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A kind of boost-buck-boost bridgeless converter

A BOOST-BUCK-BOOST and converter technology, applied in the field of AC/DC converters, can solve the problems of low efficiency, large common-mode current, and strong electromagnetic interference of two-stage structure converters, and achieve simple structure, low cost, The effect of high circuit reliability

Active Publication Date: 2016-01-06
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing bridgeless AC / DC converter has the defects of large common mode current and strong electromagnetic interference, while the efficiency of the two-stage structure converter is low

Method used

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  • A kind of boost-buck-boost bridgeless converter
  • A kind of boost-buck-boost bridgeless converter
  • A kind of boost-buck-boost bridgeless converter

Examples

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Embodiment

[0016] Such as figure 1 As shown, a BOOST-BUCK-BOOST bridgeless converter includes a BOOST circuit link, a BUCK-BOOST circuit link and an output circuit link. The BOOST circuit link is composed of a second switching tube S2, an inductor L and a second diode D2, and the BUCK-BOOST circuit link is composed of a first switching tube S1, an inductor L and a first diode D1, and the The output circuit link is composed of a load, a capacitor C and a third diode D3.

[0017] In the positive half cycle of the input voltage, the circuit works in BOOST mode, in the negative half cycle of the input voltage, the circuit works in BUCK-BOOST mode, the BUCK-BOOST circuit link and the BOOST circuit link share the inductance L, and the two circuits flow through the inductance L when they work alternately The direction of the current is unchanged, which reduces the di / dt in the circuit. The third diode D3 in the output circuit link is used to block the positive half cycle current of the input ...

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Abstract

The invention discloses a BOOST-BUCK-BOOST bridgeless convertor which comprises an input alternating current power supply, a first switch tube, a second switch tube, an inductance, a first diode, a second diode, a third diode, a capacitor and a load, wherein a source electrode of the first switch tube is connected with an anode of the second diode and one end of the input alternating current power supply respectively; a drain electrode of the first switch tube is connected with one end of the load, one end of the capacitor, one end of the inductance and a drain electrode of the second switch tube respectively; the other end of the inductance is connected with a cathode of the second diode and the cathode of the first diode respectively; an anode of the third diode is connected with the other end of the load and the other end of the capacitor respectively; a cathode of the third diode is connected with a source electrode of the second switch tube, an anode of the first diode and the other end of the input alternating current power supply. The convertor is simple in structure, high in efficiency, easy in control circuit realization, high in power density, high in circuit reliability and low in cost.

Description

technical field [0001] The invention relates to the field of AC / DC converters, in particular to a BOOST-BUCK-BOOST bridgeless converter. Background technique [0002] At present, the commonly used AC / DC converters mainly include single-stage structure and two-stage structure. The single-stage structure is usually a bridgeless AC / DC converter, and the two-stage structure is generally composed of a diode rectifier circuit and a DC / DC converter. . The existing bridgeless AC / DC converter has the defects of large common-mode current and strong electromagnetic interference, while the efficiency of the two-stage structure converter is low. Contents of the invention [0003] The object of the present invention is to overcome the shortcomings of the above-mentioned prior art, and propose a BOOST-BUCK-BOOST bridgeless converter. [0004] The present invention adopts following technical scheme: [0005] A BOOST-BUCK-BOOST bridgeless converter, comprising an input AC power supply, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/12H02M3/10
Inventor 张波张能黄子田丘东元肖文勋
Owner SOUTH CHINA UNIV OF TECH
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