DC/DC converter

A technology of DC converter and high-frequency transformer, applied in the field of power supply, can solve the problems of difficult design of secondary side synchronous rectification drive control, unoptimized transformer design, complicated control method, etc., to eliminate adverse effects, reduce switching loss and EMI, The effect of improving conversion efficiency

Inactive Publication Date: 2015-06-24
HAWUN ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a kind of A DC / DC converter with simple control mode, optimized design of transformer, simple design of synchronous rectification drive control circuit, and small output ripple current

Method used

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Embodiment Construction

[0027] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0028] like figure 1 As shown, in an embodiment of a DC / DC converter of the present invention, the DC / DC converter includes an inverter unit, a resonance unit, a high-frequency transformer and a rectification and filtering unit; the above inverter unit is in an asymmetric, complementary Under the action of the pulse width modulation (PWM) control signal, the DC input is converted into a square wave; and the resonance unit obtains the output square wave from the above-mentioned inverter unit and makes it resonate. The resonant capacitor on the transformer; the rectification and filtering unit adopts current doubler rectification, full wave rectification or full bridge rectification and converts the AC waveform on the secondary side of the high frequency transformer into a DC output through LC filtering. figure 2 It is a schematic diagram of the circuit ...

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Abstract

The invention relates to a DC / DC converter. The DC / DC converter comprises an inverter unit, a resonance unit, a high-frequency transformer and a rectification smoothing unit. The inverter unit comprises semi-bridge circuits or a full-bridge circuit, wherein the semi-bridge circuits are under the action of control signals modulated by the asymmetry and complementary pulse width or the full-bridge circuit is under the control of the constant frequency phase-shift to convert the direct-current input into square waves; the resonance unit obtains the square weaves output by the inverter unit to make the square weaves be in the resonance state. The resonance unit comprises a resonance inductor, a first resonance capacitor and a second resonance capacitor. The rectification smoothing unit is used for combining various LC smoothing in a current-doubler rectification or full-wave rectification or full-bridge rectification mode and converting altering current waves on the secondary side of the high-frequency transformer into direct-current output. The DC / DC converter has the following advantages that the control mode is simple, the output ripple is small, conversion efficiency is high and the transformer is simple in design.

Description

technical field [0001] The present invention relates to power supplies, and more particularly, to a DC / DC converter. Background technique [0002] Generally speaking, the resonant network is applied to the power conversion circuit, which can effectively reduce the switching loss and noise of the circuit, reduce electromagnetic interference, reduce the voltage and current pressure of the device, increase the switching frequency, improve efficiency, reduce volume and weight, and increase power for the converter. Density creates good conditions. At present, the widely used LLC resonant topology adopts PFM control in the control method, that is, the switching frequency changes, which makes the design of the control method complicated; when PFM control is used, the transformer needs to be designed according to the minimum operating frequency, and the design of the transformer itself is complicated. The parameters are difficult to optimize; in the synchronous rectification circu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/338H02M1/14
CPCH02M3/335H02M3/33592H02M1/14H02M7/5395
Inventor 王跃斌宋栋梁崔荣明
Owner HAWUN ELECTRONICS CO LTD
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