Active clamping high gain boost converter using coupling inductor

A coupled inductor and high-gain technology, which is applied in the field of active clamp high-gain boost converters, can solve the problems of high voltage spikes generated by its own leakage inductance, large voltage stress of power switch tubes, etc., to solve high voltage spikes, Reduced voltage stress and high output gain

Inactive Publication Date: 2013-10-16
NO 8357 RES INST OF THE THIRD ACADEMY OF CHINA AEROSPACE SCI & IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] For example, the document "Analysis of Coupled Inductor BOOST Circuits Applied in UPS" (author: Fang Yu, public date 2009-12-20) proposes that the output voltage gain can be increased by using coupled inductors, but the leakage inductance of coupled inductors A high voltage spike will be generated when the power switch tube is turned off, and the voltage stress of the power switch tube is very large

Method used

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  • Active clamping high gain boost converter using coupling inductor
  • Active clamping high gain boost converter using coupling inductor
  • Active clamping high gain boost converter using coupling inductor

Examples

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Embodiment 1

[0020] Such as figure 1 As shown, the active-clamp high-gain boost converter using coupled inductors includes a power switch S1, a clamp switch S2, a freewheeling diode D1, a clamp capacitor C1, and an output filter capacitor C2. A coupled inductor L. The coupled inductor L has two windings La, Lb, one end of the first winding La is connected to the positive end of the power supply Vin, the other end of the first winding La is connected to the drain of the power switch S1 and the source of the clamping switch S2 and the second One end of the second winding Lb is connected, the other end of the second winding Lb is connected to the anode of the freewheeling diode D1, the cathode of the freewheeling diode D1 is connected to the positive end of the output filter capacitor C2 and one end of the load R1, and the source of the power switch S1 The pole is connected to the negative end of the output filter capacitor C2 and the other end of the load resistor R1 is connected to the neg...

Embodiment 2

[0023] Such as figure 2 As shown, the difference from Embodiment 1 is that the other end of the clamping capacitor C1 connected to the drain of the clamping switch S2 is connected to the negative terminal of the power supply Vin.

Embodiment 3

[0025] Such as image 3 As shown, the difference from Embodiment 1 is that the other end of the clamping capacitor C1 connected to the drain of the clamping switch S2 is connected to the cathode of the freewheeling diode D1.

[0026] When the converter is working, in one switching cycle, the power switch tube S1 is first turned on, the first winding La of the coupling inductor charges and stores energy, and the positive voltage is induced on the second winding Lb of the coupling inductor, the freewheeling diode D1 is reversely cut off, and the load R1 Energy is provided by the output filter capacitor C2 to maintain the output voltage. When the power switch S1 is turned off, the clamp switch S2 is turned on, and the clamp capacitor C1 absorbs leakage inductance energy. At the same time, part of the energy in the first winding La of the coupled inductor is transferred to the second winding Lb of the coupled inductor when the power switch tube S1 is turned off, and then La, Lb, ...

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PUM

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Abstract

The invention discloses an active clamping high gain boost converter using a coupling inductor. The converter comprises a power switch tube, a clamping switch tube, a fly-wheel diode, a clamping capacitor, an output filtering capacitor and the coupling inductor with two windings. In the invention, the coupling inductor is used to increase the gain of the converter; a clamping circuit formed by the clamping switch tube and the clamping capacitor is used to absorb a turn-off voltage spike of a main power switch tube, realize lossless transfer of energy and reduce a voltage stress of the main power switch tube, wherein the turn-off voltage spike of the main power switch tube is caused by a leakage inductor. Because the structure of the circuit is simple, cost is low and control is convenient, the boost power supply converter has an important popularization value. The boost converter of the invention can replace the existing boost converter and can be used for a booster type power supply and the like.

Description

technical field [0001] The present invention relates to DC-DC power converters, and more particularly to an active-clamp high-gain boost converter using coupled inductors. Background technique [0002] A conventional step-up (BOOST) DC-DC power converter includes a power switch tube, a freewheeling diode, an inductor, and an output filter capacitor. The output voltage gain of this boost-type DC-DC power conversion device is small . [0003] For example, the document "Analysis of Coupled Inductor BOOST Circuits Applied in UPS" (author: Fang Yu, public date 2009-12-20) proposes that the output voltage gain can be increased by using coupled inductors, but the leakage inductance of coupled inductors A very high voltage spike will be generated when the power switch tube is turned off, and the voltage stress of the power switch tube is very large. Contents of the invention [0004] The invention discloses an active clamp high-gain boost converter using a coupled inductor, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/10
Inventor 何晓宇杨印晟
Owner NO 8357 RES INST OF THE THIRD ACADEMY OF CHINA AEROSPACE SCI & IND
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