This paper introduces a phase-shifting and frequency-dependent, PSFV (PSFV) PWM control based on digital signal processor (DSP) The main circuit topology is given, the control principle is analyzed and the flow chart of control program is designed. The novel PSFV control can achieve output The adjustment rate of the voltage is 90%, the output current fluctuation is less than the simple shift phase of the PWM mode, and it is maintained continuously at light load. Power switch device zero voltage zero current The realization of the soft switch of Zero-Voltage-Zero-Current Switching is conducive to further increasing the Switching frequency and reducing Switching loss. using The high performance special DSP chip TMS320F2812 achieves the digital control of the system, which satisfies the flexibility and real time of system control and reduces the system Volume and production costs. The simulation analysis and experimental results prove the feasibility and rationality of this control mode.

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