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The widely used Boost type front-end Power factor correction (PFC) circuit for electric vehicle (EV) chargers has a common problem that, the bulky dc-bus capacitor will cause uncontrollable start-up surge current, which is a hidden trouble for system reliability. The reason for surge current is analyzed and a step-variable soft start control method is developed in this paper. A CPLD based phase shift...
In this paper, a novel passive lossless snubber is proposed for current-fed half-bridge isolated dc/dc converter. The snubber is composed of two small inductors, three diodes and two capacitors. Compare with traditional hard-switched current-fed half-bridge isolated dc/dc converter, ZVS turned-off for the switches are realized in the proposed converter and the voltage spike of turned-off switch, which...
This paper proposes a new double feedback loop control scheme for single-phase voltage-source uninterruptible power supply(UPS) inverter with L-C filter. Proportional regulator and proportional-resonant (PR) regulator are applied to the inner current controller and outer voltage controller respectively to guarantee the robustness of the system. In order to improve the dynamic response, a load current...
A novel soft-switching boost converter with a magnetically coupled resonant snubber is presented in this paper. The passive snubber circuit, which is composed of two diodes, two capacitors, and one coupled inductor, ensures a zero current turn-on and zero voltage turn-off conditions for the power switch, and alleviates the reverse-recovery problem for the output diode. Moreover, with the proper design...
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