A study of single phase hysteresis current control for reducing switching loss using the slope of reference current

Hysteresis current regulator has been used widely because of its simple principle and structure. However, when the current band width is too narrow or the applied voltage is relatively too high, the switching frequency increases abruptly and it generates a large amount of heat. Thus, this study will suggest a better and simple method to reduce the switching frequency. For single phase current control, the proposed hysteresis current control is executed by adding 0 mode state and comparing the slope of the current reference. When the slope is positive, the applied voltage is the DC link voltage or 0 mode state. If the slope is negative, the applied voltage becomes 0 mode state or - DC link voltage. This simple method decreases the generated switching frequency and significantly reduces the generated heat. This proposed method was proved with simulations.