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Zero-voltage switching pulse-width modulation converter

A pulse width modulation, converter technology, applied in the conversion device for adjusting electrical variables, output power, converting DC power input to DC power output, etc., can solve converter failure, temperature rise, large loss of auxiliary circuit devices, etc. question

Active Publication Date: 2014-05-07
SHENZHEN CLOU ELECTRONICS +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a zero voltage transition pulse width modulation converter, which aims to solve the problem of the existing zero voltage transition pulse width modulation converter under the condition that only the auxiliary switch tube is turned on, due to the influence of the energy storage of the auxiliary inductor , so that the devices in the auxiliary circuit suffer from large loss, resulting in damage due to excessive temperature rise, resulting in the failure of the entire converter

Method used

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Embodiment 1

[0043] image 3 The circuit of the zero-voltage conversion pulse width modulation converter provided by the first embodiment of the present invention is shown, and the zero-voltage conversion pulse width modulation converter is a Boost type zero-voltage conversion pulse width modulation converter.

[0044]Specifically, in the Boost-type zero-voltage conversion PWM converter, the main circuit 11 may include: a first input power supply VS1 of the zero-voltage conversion PWM converter, a first main switch Q1, a first main inductor L1, The first main diode D2 and the first filter capacitor CF1. The first end of the first main inductance L1 is connected to the positive pole of the first input power supply VS1, the second end of the first main inductance L1 is connected to the high end of the first main switch tube Q1 and the anode of the first main diode D2. The low end of the switch tube Q1 is connected to the negative pole of the first input power supply VS1, and the low end of ...

Embodiment 2

[0055] Figure 4 The circuit of the zero-voltage conversion pulse width modulation converter provided by the second embodiment of the present invention is shown. The zero voltage conversion pulse width modulation converter is a Boost zero voltage conversion pulse width modulation converter.

[0056] and image 3 Different from what is shown, the Boost zero-voltage conversion PWM converter does not include the first buffer diode DH1 and the first auxiliary capacitor CA1. That is to say, the auxiliary circuit 12 at this time includes: a first auxiliary inductor LA1, a first auxiliary switch transistor QA1, and a first auxiliary diode DA1. The first end of the first auxiliary inductance LA1 is connected to the reset circuit 13, the second end of the first auxiliary inductance LA1 is connected to the high end of the first auxiliary switch QA1 and the anode of the first auxiliary diode DA1. The low end is connected to the reset circuit 13 and the low end of the first main switch...

Embodiment 3

[0059] Figure 5 The circuit of the zero-voltage conversion pulse width modulation converter provided by the third embodiment of the present invention is shown, and the zero-voltage conversion pulse width modulation converter is a Buck-type zero-voltage conversion pulse width modulation converter.

[0060] Specifically, in the Buck-type zero-voltage conversion PWM converter, the main circuit 11 may include: a second input power supply VS2 of the zero-voltage conversion PWM converter, a second main switch Q2, a second main inductor L2, The second main diode D3 and the second filter capacitor CF2. The high end of the second main switch tube Q2 is connected to the positive pole of the second input power supply VS2, the auxiliary circuit 12 and the reset circuit 13, and the low end of the second main switch tube Q2 is connected to the reset circuit 13, the auxiliary circuit 12, and the second main inductance L2. The first end of the second main diode D3 and the cathode of the sec...

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Abstract

The invention belongs to the field of electric energy transformers, and provides a zero-voltage switching pulse-width modulation converter. A reset circuit is added in the converter on the basis of an existing main circuit and an existing auxiliary circuit, and the reset circuit comprises a reset switching tube and a reset diode. Under the working condition that only an auxiliary switching tube is turned on after the reset switching tube is turned off, a current in an auxiliary inductor flows in output voltages or an input power supply of the converter through the reset diode and related elements in the auxiliary circuit, thus the amplitude of the current in the auxiliary inductor drops to zero rapidly, zero-current turning-on of the auxiliary switching tube, the reset switching tube and the auxiliary inductor and zero-current turning-off of an auxiliary diode and a reset diode are achieved, therefore, it is guaranteed that elements in the auxiliary circuit and elements in the rest circuit are low in loss, and safe and reliable operation of the converter in a whole on-off operating period under the working conditions of a full input voltage range, a full load range and the like is guaranteed.

Description

technical field [0001] The invention belongs to the field of electric energy converters, in particular to a zero-voltage conversion pulse width modulation converter. Background technique [0002] Zero Voltage Transition (ZVT) Pulse Width Modulation (PWM) technology is a DC conversion technology that combines soft switching technology and PWM technology. In the isolated DC / DC converter, the following are formed: Buck (Buck) zero-voltage conversion PWM converter, Boost (Boost) zero-voltage conversion PWM converter, Buck / Boost type Zero voltage conversion pulse width modulation converter, Cuk type zero voltage conversion pulse width modulation converter, Sepic type zero voltage conversion pulse width modulation converter, and Zeta type zero voltage conversion pulse width modulation converter. [0003] like figure 1 Taking the boost type as an example, the typical circuit principle of the zero-voltage conversion pulse width modulation converter provided in the prior art is sho...

Claims

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Application Information

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IPC IPC(8): H02M3/155
Inventor 范家闩
Owner SHENZHEN CLOU ELECTRONICS
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