Boost Converter Control for Constant-Frequency High Power Factor

The patent employs periodic action by using a fixed-frequency clock signal to generate gate drive pulses for the transistor switch. The clock signal operates at a predetermined frequency, ensuring that switching occurs at regular intervals regardless of the conduction mode. This periodic switching mechanism simplifies the control scheme while maintaining stable switching frequency, resolving the contradiction between control simplicity and frequency stability in discontinuous conduction mode operation.

The patent implements feedback by monitoring the voltage across the capacitor and using it to control the duty cycle of the transistor switch. The controller adjusts the switching duty cycle based on the capacitor voltage feedback to maintain a substantially constant output voltage. This feedback mechanism enables the system to adapt to load changes while maintaining stable output, resolving the contradiction between load adaptability and frequency stability by decoupling output regulation from switching frequency.