Novel Active Boost Power Converter for SR Drive

In this paper, a novel active boost converter for the SR drive is proposed. An active capacitor circuit is added in the front-end. Based on this active capacitor network, when the boost switch turns off, this network seems as a passive capacitor network. And the voltage of boost capacitor can keep balance with the dc-link voltage automatically. In the capacitor network, the discharging voltage is the general dc-link voltage in the parallel-connected capacitors; the charging voltage is double dc-link voltage in the series-connected capacitors. So the fast demagnetization current is obtained. When the boost switch turns on, the two capacitors are connected in series, and the discharging voltage is up to double dc-link voltage. The fast excitation current can be obtained from this mode. The performance and output power can be improved from the fast excitation and fast demagnetization mode. Some computer simulations and experimental results are done to verify the performance of proposed converter.