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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

Inactive Publication Date: 2017-06-20
李福来
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Problems solved by technology

Full-bridge phase-shift control soft-switching PWM converter is one of the ideal topologies for DC power supply to achieve high frequency, especially in the application of medium and high-power converters, the efficiency of DC-DC converters realized by soft-switching technology can reach 90 More than %, the wide application of traditional AC-DC converters also brings low conversion efficiency

Method used

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

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Embodiment Construction

[0012] exist figure 1 Among them, it is composed of EMI filter and phase-shift control ZVS-PWM-DC / DC full-bridge converter. The single-phase 22OV / 50Hz mains input is rectified and filtered to obtain a DC voltage of about 300V, which is supplied to the varistor at the input end of the subsequent DC / DC full-bridge converter to buffer the excessive current when starting up, and then passes through a pair of EMI filter composed of common mode inductor and filter capacitor. It is composed of four main power MOSFETs Q1, Q2, Q3 and Q4 behind the input rectifier bridge and C1~C4. The control chip UC3875 outputs a phase-shift PWM control signal to control the four MOSFETs. The two power of each bridge arm The tubes are 180° complementary conduction, and the conduction of the two bridge arms differs by a phase, that is, the phase shift angle. The width of the output pulse is adjusted by adjusting the size of the phase shift angle. At the output end, an output voltage division signal i...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02H7/125
CPCH02M3/33523H02H7/1252
Inventor 李福来
Owner 李福来
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