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A phase-shifted full-bridge switching converter

A switching converter and phase-shifting full bridge technology, which is applied in the direction of instruments, DC power input conversion to DC power output, and adjustment of electrical variables, can solve problems such as soft switching failure of lagging bridge arms, and achieve shortening Miller platform time, Low cost and good reliability

Active Publication Date: 2017-02-15
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current design for reliability is mainly aimed at the failure of the soft switch of the lagging arm under light load conditions, while ignoring the problem of the Miller platform extension of the leading arm under heavy load conditions

Method used

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  • A phase-shifted full-bridge switching converter
  • A phase-shifted full-bridge switching converter
  • A phase-shifted full-bridge switching converter

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Embodiment Construction

[0031] Below in conjunction with accompanying drawing, the technical scheme of invention is described in detail:

[0032] figure 1 It is the existing technology including input rectification filter circuit 1, leading bridge arm and its isolation drive circuit 2, lagging bridge arm and its isolation drive circuit 5, high frequency transformer 6, output freewheeling circuit 7, output filter circuit 8, output voltage sampling Circuit 9 and phase-shift control circuit 11 constitute a basic phase-shift full-bridge switching converter. The invention is figure 1 On the basis of the prior art, a resonant transformer circuit 3, a resonant transformer controller 4 and an output current sampling circuit 10 are added, such as figure 2 . figure 1 and figure 2 The double-headed arrows shown in indicate that the current will flow in different directions at different times.

[0033] like image 3, the input rectification and filtering circuit 1 is composed of four diodes to form a ful...

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Abstract

A phase-shifted full-bridge switching converter, based on an input rectification filter circuit, a leading bridge arm and its isolation drive circuit, a lagging bridge arm and its isolation drive circuit, a high-frequency transformer, an output freewheeling circuit, an output filter circuit, and an output voltage The basic phase-shift full-bridge switching converter structure of the sampling circuit and the phase-shift controller is characterized in that a resonant transformer circuit instead of a resonant inductance is added between the leading bridge arm and its isolated drive circuit and the high-frequency transformer, and a power semiconductor switching device is used The resonant transformer controller is controlled by the phase shift control circuit. An output current sampling circuit is added between the output ground terminal of the output filter circuit and the phase-shift controller, which greatly improves the reliability of the phase-shift full-bridge switching converter.

Description

technical field [0001] The invention relates to a switching converter, in particular to a phase-shifting full-bridge switching converter, which can improve the reliability of a power semiconductor switching device. Background technique [0002] Currently, in the application of high-power switching converters, isolated full-bridge converters are the most common, because the main advantages of isolated full-bridge converters are: [0003] 1. As a variant of the Buck converter, the efficiency of the full bridge converter is very high; [0004] 2. The voltage on the primary side of the high-frequency transformer is positive and negative symmetrical, and there is no problem of magnetic bias; [0005] 3. When the drain-source voltage of the power MOSFET is the highest, it is equal to the bus voltage, and the voltage stress on the power MOSFET of the full-bridge converter is low; [0006] The mainstream control methods of the full-bridge converter are divided into hard switching ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335
CPCH02M1/38H02M3/33576H02M1/0058Y02B70/10
Inventor 钱钦松俞居正朱俊杰郭小强孙伟锋陆生礼时龙兴
Owner SOUTHEAST UNIV
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