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
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[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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