DSP Implementation of digitally controlled SMPS

This paper describes the design and implement of digitally controlled Switching Mode Power Supply (SMPS) that can meet the specifications of steady- state and dynamic requirements. In this architecture, the primary-side DSP can easily implement the control of two interleaved PFCs and one phase-shift full-bridge (PSFB) PWM DC-DC converter. To realize high power density, Peak-current flux bias control can get rid of blocking capacitor to reduce freewheeling time and duty cycle loss. The modeling of quantization effect and analysis of limit cycle are described in the following part of this paper. In the end of this paper, the operation principle and design consideration are described and verified on a 3 kW, 110 kHz experimental power supply.