UC3875-based switching power supply of phase-shift full-control inverter bridge

A technology of switching power supply and inverter bridge, which is applied in the direction of electrical components, adjusting electrical variables, control/regulation systems, etc., can solve problems such as low conversion efficiency, and achieve the effects of small switching loss, high control precision, and small ripple coefficient
CN106877667AInactive Publication Date: 2017-06-20ๆŽ็ฆๆฅ
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
ๆŽ็ฆๆฅ
Publication Date
2017-06-20
Estimated Expiration
Not applicable ยท inactive patent

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Abstract

The switching power supply of the phase shifting fully controlled inverter bridge based on UC3875 is composed of a main circuit, an overvoltage protection circuit, an overcurrent protection circuit and an adjustable link. The main circuit is composed of an EMI filter and a phase shifting control ZVS-PWM- Composed of DC / DC full-bridge converters, the overvoltage protection circuit is composed of NE555; once the overcurrent protection circuit is overcurrent, the comparator outputs a high level, UC3875 locks and trips, and the power supply stops working. Based on UC3875 phase-shift full-control inverter bridge switching power supply, ZVS phase-controlled PWM mode has small switching loss, low switching strength, high electrical efficiency, good controllability, stability and reliability, high control precision, and small ripple coefficient and many other advantages.
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Description

technical field

[0001] The invention relates to a switching power supply of a phase-shifting full-control inverter bridge based on UC3875. Background technique

[0002] The traditional full-bridge PWM converter is suitable for the situation of outputting low voltage and high power, as well as occasions where the power supply voltage and load current vary greatly. Its advantage is that the switching frequency is fixed and easy to control. In order to increase the power density of the converter and reduce the volume and weight of the unit output power, it is necessary to increase the switching frequency. Combining resonant converter and PWM technology to form a soft-switching PWM control scheme, which can not only realize the soft-switching characteristics of power switches, but also realize constant frequency control, is one of the research hotspots in the field of power electronics technology today. Full-bridge phase-shift control soft-switching PWM converter is one of the...

Claims

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