Novel passive boost converter for 3-phase Switched reluctance motor

This paper presents a novel passive boost power converter for 3-phase Switched reluctance motor. A simple passive circuit is proposed, which makes of three diodes and one capacitor. It is added in the front-end of conventional asymmetric converter to obtain high negative bias. Based on this passive network, the terminal voltage of the converter side is a general dc-link voltage level in parallel mode and is up to a double dc-link voltage level in series mode. So it can suppress the negative torque generation from the tail current and improve the output power. Combining passive circuit with 3-phase asymmetric converter, without phase current overlap, the phase winding obtains the dc-link voltage in excitation mode and the negative double dc-link voltage in demagnetization mode. With phase current overlap, the dc-link voltage or double dc-link voltage is dependent on the overlap current. The operation modes of the proposed converter are analyzed with a 3-phase SR motor in detail. The compared simulation and experiments for the conventional and proposed converter have been executed. And the results verify the performance of proposed converter.