Dual-bridge DC-DC converter and its control method

A technology of DC converter and converter, which is applied in the direction of DC power input conversion to DC power output, control/regulation system, conversion equipment with intermediate conversion to AC, etc. It can solve the problem that asymmetrical half bridges cannot use high-power circuits, Problems such as magnetic bias and saturation of the main transformer, to achieve the effect of improving energy transmission efficiency and power conversion efficiency

Active Publication Date: 2008-04-30
叶忠
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, large load changes can easily cause bias and saturation of the main transformer
Therefore, the asymmetrical half-bridge cannot be used in high-power circuits; when designing, its zero-crossing frequency is relatively low

Method used

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  • Dual-bridge DC-DC converter and its control method
  • Dual-bridge DC-DC converter and its control method
  • Dual-bridge DC-DC converter and its control method

Examples

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Embodiment Construction

[0042] In conjunction with the accompanying drawings, the structural features of the present invention are: the double-bridge DC-DC converter includes an inverter, a rectifier and a filter, the DC voltage is input to the inverter, and the AC output of the inverter is then input to the rectifier The AC input terminal, the DC output terminal of the rectifier and then output the converted DC voltage through the filter;

[0043] The inverter is composed of first and second DC-AC inverters, and each DC-AC inverter has two mutually isolated first and second AC output ports;

[0044] The rectifier is composed of first and second full-wave rectification circuits, and each full-wave rectification circuit is composed of a rectifier and a freewheeling element;

[0045] The filter is composed of a first inductance, a second inductance, two inductances and a capacitor;

[0046] The first rectifying element of the first rectifying circuit in the rectifier is connected in series with one en...

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PUM

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Abstract

The invention discloses a DC-DC converter circuit and a relevant control method; wherein, the converter comprises two DC-AC inverters; each can create symmetrical and isolated square waves or other similar AC output voltage. Through the movement of the phase of one of the DC-AC inverters, the overlapping part of the corresponding voltage of a DC output filtration circuit, which is the two DC-AC inverters can be applied to, will be changed accordingly, so as to reach the target of regulating the output voltage. A double half-bridge and double full-bridge DC-DC converters are two typical types of the converters. During normal running process, the bridge-type inverter is always running in a 50 percent of duty cycle, so as to fulfill Zero Voltage Switching (ZVS) in broad loads. Meanwhile, the invention can also eliminate circulation current, so as to improve the efficiency of power conversion. As for the adjustment and startup of low output voltage, the circuit can work in a Pulse Width Modulation (PWM) status.

Description

technical field [0001] The present invention relates to a DC-DC converter (DC-DC Converter), which has two power transformers, is controlled by PWM and phase shifting, and has the characteristics of wide-load ZVS and zero circulation current. More specifically, dual half-bridge and dual full-bridge DC-DC converters. Background technique [0002] In the field of power conversion, high-frequency switching technology is usually used to convert direct current from one voltage level to another isolated voltage level. The use of switching technology greatly reduces the volume of the converter and improves the conversion efficiency. While the industry is enjoying this switching technology, it is facing new challenges, including further improving conversion efficiency, reducing volume and reducing electromagnetic interference (EMI) caused by switching voltage and current. For these challenges, many efforts have focused on the following four areas: [0003] 1. Wide-load zero-volta...

Claims

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Application Information

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IPC IPC(8): H02M3/28H02M3/335
Inventor 叶忠
Owner 叶忠
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