Current Hysteresis Control of High Step-up Current-fed DC-DC Converter for Haptic Application

Abstract

Abstract-The steady accuracy of output waveforms is a core index for judging the performance of DC-DC converter and it is mainly determined by the control scheme of DC-DC converter. This paper studied a PWM current hysteresis control scheme to improve the performance of the high step-up current-fed DC-DC converter proposed in our previous work. This control scheme treated the currents of two input inductors as control quantities, and treated the error between the practical and theoretical output voltage as feedback quantity. It calculated the reference current of input inductor by collecting the output voltage and current of the DC-DC converter, and adjusted the hysteresis band width in real time. A control system including the DC-DC converter and the current hysteresis control circuit has been presented and evaluated. The simulation results demonstrates its easy-implementation, fast response, and high steady accuracy of 97%.