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Semi-bridge soft switch direct current converter and control method thereof

A DC converter and soft switching technology, which is applied in the direction of DC power input conversion to DC power output, control/regulation systems, instruments, etc., can solve the problems of large switching loss and large voltage oscillation of the rectifier circuit, so as to reduce system loss and Effects of high-frequency noise, reduction of resonance parameters, and improvement of conversion efficiency

Inactive Publication Date: 2011-08-10
SUZHOU INST OF INDAL TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] In view of the above-mentioned defects in the prior art, the purpose of the present invention is to propose a half-bridge type soft-switching DC converter and its control method to solve the large switching loss and the voltage oscillation of the rectifier circuit in the half-bridge type DC-DC converter. big problem

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  • Semi-bridge soft switch direct current converter and control method thereof
  • Semi-bridge soft switch direct current converter and control method thereof
  • Semi-bridge soft switch direct current converter and control method thereof

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Embodiment Construction

[0023] Combine below Figure 2 to Figure 6 The schematic diagram, equivalent circuit diagram, and working waveform schematic diagram of the converter of the present invention shown further illustrate the essential features and remarkable effects of a half-bridge soft-switching DC converter and its control method of the present invention. figure 2 is a schematic circuit structure diagram of an embodiment of the present invention, and its composition includes a switching device S 1 , S A , S 2 , S R1 , S R2 , both use full control switching device MOSFET or IGBT, inductance L add , L O , Diode D 1 、D 2 , Transformer T RS , resonant capacitor C B , C O . Switching device S 1 , S A , S 2 , S R1 , S R2 Both use fully controlled switching devices MOSFET or IGBT.

[0024] S 1 The power input terminal and the positive pole of the input power supply, D 1 connected to the negative pole of S 1 The power output terminal with S A The power input terminal, L add conne...

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Abstract

The invention discloses an improved semi-bridge soft switch direct current-direct current (DC-DC) converter which comprises switch apparatuses S1, SA, S2,SR1 and SR2, inductors Ladd and LO, diodes D1 and D2, a transformer TRS and resonance capacitors CB and CO. The SA, the Ladd, the D1 and the D2 are additionally arranged on the basis of a general semi-bridge DC converter to form an assistant soft switch apparatus; the master power switch apparatuses S1 and S2 are used for turning on and turning off the wide-range zero voltage through ration control; meanwhile, the voltage oscillation of a transformer secondary rectifying circuit is effectively inhibited. The work efficiency of the transformer is effectively improved, the system loss and the high-frequency noise are reduced, and the high frequency, the high integration level and the high power density are easy to realize.

Description

technical field [0001] The invention relates to a soft-switching half-bridge DC converter and a control method thereof, belonging to the field of electric energy conversion. Background technique [0002] The half-bridge DC converter has the advantages of large voltage transformation ratio and easy realization of high power, etc., and has been widely used in switching power supplies for personal computers and low-voltage high-power switching power supplies in the communication field. However, the hard switching working mode adopted by the traditional circuit, in the process of turning on and turning off the power switching device and the power diode, due to the high switching frequency, a large switching loss is generated, resulting in a decrease in system efficiency and restricting the switching frequency. Lifting is not conducive to reducing loss, volume and cost. [0003] One solution to the above problems is to use soft switching technology. Among the existing soft swit...

Claims

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Application Information

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IPC IPC(8): H02M3/338H02M1/14
CPCY02B70/1491Y02B70/10
Inventor 卜树坡曹建东章雯钱涛赵展
Owner SUZHOU INST OF INDAL TECH
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