A new digitally controlled switching power supply for green IT

This paper presents transient response characteristics of digitally controlled dc-dc converter with a new control method. In the conventional digital control method, the sampling rate is single and the calculation process of P-I-D control is series. On the other hand, in the proposed method, the sampling rate is multiple and the calculation process of P and I-D controls is parallel. The AD converter can sample the output voltage during the short interval because the calculation process of P control is very simple. The only sample data near the turn-off timing of PWM pulse is used. The simulation and experiment results of the output voltage against the step change of the load are discussed. As a result, it is revealed experimentally that the good transient response is obtained.