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Constant phase shifting full-bridge soft switching technique

A kind of soft switching and technical technology, which is applied in the direction of high-efficiency power electronic conversion, output power conversion device, electrical components, etc., and can solve problems such as inappropriate

Inactive Publication Date: 2019-04-09
汪水仿
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this type of chip is more expensive, and it usually operates at tens of kilohertz, which is not suitable for working at low frequencies.

Method used

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  • Constant phase shifting full-bridge soft switching technique
  • Constant phase shifting full-bridge soft switching technique

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Embodiment Construction

[0025] The above scheme will be further described below in conjunction with specific examples. It should be understood that these examples are for illustrating the present invention rather than limiting the protection scope of the present invention. The implementation conditions adopted in this embodiment can be further adjusted according to the conditions of specific manufacturers,

[0026] The unspecified implementation conditions are usually the conditions in routine experiments.

[0027] The PWM controller can use a cheap 3525 chip, which contains voltage and current feedback signals. The phase shift circuit can use an RC phase shift circuit. The power tube is a MOS tube. A small capacitor C is connected in parallel between the drain and source poles. The drive circuit uses IR2110 The two output PWM signals generated by the 3525 chip are respectively connected to the RC circuit, and the RC circuit is respectively connected to the IR2110, and the IR2110 drives the MOS tube ...

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Abstract

The object of the invention is to provide a constant phase shifting soft switching technique, which, by replacing a dedicated chip with a relatively inexpensive chip, greatly expands the operating frequency range, and can operate at a low frequency. This technique is implemented by adjusting the duty ratio when voltage regulation or voltage stabilization is performed, rather than by changing the phase, which is significantly different from the usual phase shift control method.

Description

technical field [0001] The invention relates to a switching power supply, an inverter power supply and other related equipment. Background technique [0002] Most of the medium and high-power switching power supplies and inverter power supplies on the market are full-bridge converters. There are mainly four kinds of control methods: bipolar control, limited bipolar control, phase shift control, and resonance control. There are corresponding integrated circuit control chips to realize. At present, the full-bridge conversion is mainly based on soft switching technology. And the soft switching technology adopts the phase-shift control method more. It uses the leakage inductance of the transformer or the primary side series inductance and the parasitic capacitance of the power tube or the external capacitance to realize the zero voltage switching technology. By constantly changing the phase, from 0 degrees to 180 degrees, to change the duty cycle, to achieve the purpose of v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5387H02M1/08
CPCH02M1/083H02M7/5387Y02B70/10
Inventor 汪水仿
Owner 汪水仿