PWM hysteresis control with inductor current for buck converter

To improve the behaviors of DC-DC converters,a hysteresis control strategy with inductor current feedback is put forward. The output voltage, output of hysteresis comparator and inductor current are measured to control the capacitor voltage, the value of the capacitor voltage and the hysteresis band width are calculated,and the capacitor voltage is controlled to a narrow range around the hysteresis band width. The principle and control scheme are analyzed with a buck converter as an example.Finally,simulation results verified that the proposed control scheme has faster transient response speed and better steady state than traditional hysteresis control.