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Reset circuit of single-end ortho-exciting electric source

A reset circuit, single-ended forward excitation technology, applied in electrical components, adjusting electrical variables, output power conversion devices, etc., can solve the problems of high cost, clamping capacitor energy storage loss, etc., to improve efficiency, reduce losses, overcome Effect of Clamping Capacitor Energy Storage Loss

Active Publication Date: 2009-02-11
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the problem that the energy storage of the clamp capacitor is lost when the clamp switch tube adopts self-driven control in the prior art, and at the same time overcome the disadvantage of high cost when the clamp switch tube is controlled by other excitation in the prior art

Method used

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  • Reset circuit of single-end ortho-exciting electric source
  • Reset circuit of single-end ortho-exciting electric source
  • Reset circuit of single-end ortho-exciting electric source

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Embodiment Construction

[0021] The implementation of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0022] figure 2 It is a schematic diagram of the present invention. In the figure, Q1 is the main switching tube of the primary side, Q2 is the clamping switching tube, C1 is the clamping capacitor, D1 and D2 are the output rectifier tube and the output freewheeling tube respectively, Lf is the filter inductor, Cf is the filter capacitor, and T is the transformer . Its working principle is: when the primary switch tube Q1 is turned on, the transformer T outputs energy to the secondary side, and the secondary side current passes through the output rectifier tube D1, the filter inductor Lf and the load, and the clamp switch tube Q2 is in the off state at this time . When the main switch tube Q1 is turned off, the voltage on the secondary side of the transformer T rises in reverse, the clamp switch tube Q2 controlled by the transformer ...

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PUM

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Abstract

A reset circuit of single end normal shock power supply is prepared as using transformer to transform input voltage, forming a clamping network by clamping switching-tube and clamping capacitor and connecting said network to two ends of secondary winding on transformer in parallel, controlling switch of switching-tube by auxiliary winding and driving circuit to form phase relation complementary to on time of primary main switching-tube, connecting rectifier and filtering circuit to secondary winding of transformer for rectifying and filtering voltage there and then providing rectified and filtered voltage to load.

Description

technical field [0001] The invention relates to the field of power supplies, in particular to a forward circuit device for a DC / DC converter. Background technique [0002] Switching power supply devices are widely used in various fields of society, among which DC / DC converters are more common, and DC / DC converters are used to convert a certain DC voltage into different output DC voltages and provide them to the load. A single-ended forward power supply is a widely used DC / DC converter, usually relying on a single switch connected between the voltage source and the primary winding of the transformer to provide power forward to the secondary winding of the transformer when the switch is on and conducting . To discharge the transformer's inductive energy storage, the transformer core needs to be "reset" during the switch-off period. Usually additional circuitry is used to complete the core reset process. Take Chinese patent CN 1332513A (disclosure date: January 23, 2002) as ...

Claims

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Application Information

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IPC IPC(8): H02M3/28H02M3/335H02M3/338
Inventor 张滨
Owner ZTE CORP
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