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Soft switching current-fed push-pull DC/DC converter

A DC converter, feed-push-pull technology, applied in the direction of converting DC power input to DC power output, adjusting electrical variables, and high-efficiency power electronic conversion, can solve problems such as large switching loss and limiting efficiency, and reduce switching loss. , the effect of improving work efficiency

Active Publication Date: 2019-04-05
ZHONGSHAN VOLTRONIC POWERELECTRIC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the hard switching mode of the current-fed push-pull DC-DC converter makes its switching loss larger, which limits the improvement of its efficiency.

Method used

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  • Soft switching current-fed push-pull DC/DC converter
  • Soft switching current-fed push-pull DC/DC converter
  • Soft switching current-fed push-pull DC/DC converter

Examples

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Embodiment Construction

[0046] The following combination Figure 6 A specific embodiment of the present invention is described in further detail. It is only used to illustrate rather than limit the technical solution of the present invention.

[0047] For this example see Figure 6 , is an implementation circuit of a soft-switching current-fed push-pull DC-DC converter of the present invention, which is connected with the main transformer TX 2 The rectifier circuit connected to the secondary winding is a full bridge rectifier circuit. The circuit contains a DC power supply U in , flyback transformer TX 1 and main transformer TX 2 , three power switches S with antiparallel diodes 1 ~S 3 , each power switch S 1 ~S 3 The external shunt capacitor C 1 ~C 3 , the fourth diode D 4 , with the main transformer TX 2 Four diodes D connected to the secondary winding 5 ~D 8 composed of a full-bridge rectifier circuit, and an output capacitor C o . u o is the output voltage. R o is the load res...

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PUM

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Abstract

A soft switching current-fed push-pull DC / DC converter includes a DC power source Uin, a flyback transformer TX1, a main transformer TX2, a fourth diode D4 connected to a secondary winding of the flyback transformer TX1, an output capacitor Co and a load resistor R0. The soft switching current-fed push-pull DC / DC converter further comprises a primary side circuit connected to the primary windingsof the two transformers and a rectifier circuit connected to the secondary winding of the main transformer. The converter adds a serial first power switch tube on the primary circuit connected with the two transformers and assist in a corresponding switching timing sequence to achieve soft switch switching of the switch tube. The soft switch switching of the switch tube is achieved, the switchingloss is reduced, and the working efficiency is improved.

Description

technical field [0001] The invention relates to a soft-switching current-fed push-pull DC-DC converter, which belongs to the technical field of power electronics. Background technique [0002] Because the traditional push-pull DC-DC converter has two primary windings, the switching tube used when it is turned off bears twice the input voltage, which is suitable for low-voltage and high-current input applications. But the traditional push-pull DC-DC converter is essentially a step-down circuit when the transformer ratio is 1, which limits its application range. The current-fed push-pull DC-DC converter moves the filter inductance to the input side, and in the same transformer TX 2 When the transformation ratio is 1, it is essentially a boost circuit, as attached figure 1 shown. Therefore, the current-fed push-pull DC-DC converter is suitable for lower input voltage U in . Moreover, since the filter inductor L p1 On the input side, the current-fed push-pull DC-DC convert...

Claims

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Application Information

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IPC IPC(8): H02M3/337
CPCH02M3/337H02M1/0058Y02B70/10
Inventor 袁义生饶晟锐
Owner ZHONGSHAN VOLTRONIC POWERELECTRIC LTD
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