Improved Pulse Regulation Control Technique for Switching DC-DC Converters Operating in DCM

Improved pulse regulation (IPR) control, a novel control technique for switching dc-dc converters, is proposed and studied in this paper. According to the output voltage and load current of the switching dc-dc converter, IPR control technique achieves output voltage regulation by generating control pulse train made up of some preset control pulses with different duty ratios. IPR control needs only comparators, triggers, and some simple logic devices, without error amplifier and the corresponding compensation circuit of pulse width modulation control scheme, thus IPR control scheme is easy to realize, benefits with excellent transient performance and stability. The principle and operation of IPR control scheme are introduced and illustrated with buck converter operating in discontinuous conduction mode as an example. Simulation and experimental results are presented to show that IPR-controlled converter has much lower output voltage ripple and more accurate output voltage regulation than PR converter.