A high performance DC power supply system

This paper presented a high performance DC power supply system with high input power factor. The presented DC power supply system provides the input current with low current distortion on the ac input side and the stable output dc voltage with low ripple voltage on the dc output side. The presented DC power supply system only uses four active switches to correct power factor in input side and regulate the output dc voltage magnitude. Moreover, the presented DC power supply system does not need soft-switching auxiliary circuit to get ZVS on main semiconductors in it. Thus, the circuit cost can be reduced. The presented DC power supply system does not also need the four-diode front-end rectifier on the ac input side. The conduction losses can also be reduced. A phase-shift resonant PWM control technique is employed to synthesize a suitable low harmonics sinusoidal waveform for the ac input current and achieve well dynamic regulation. A design example of 500W DC power supply system is examined to assess its performance.