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In this paper, a 5kW wireless electric vehicles (EV) charger is introduced and modeled in time-frequency domain. Base on the function of the charging current, two current control methods are discussed. It is found that the DC-link voltage control can make the voltage source inverter (VSI) work under soft switching mode but the adjustable range of the charging current is limited. The phase shift control...
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...
This paper proposes a new virtual impedance method for parallel inverters. To achieve wireless control, the droop control method is adopted, and virtual output impedance is usually added to alleviate the unbalance of output impedance between each inverter and then, improve power sharing accuracy. However, resistive virtual impedance usually causes a certain voltage drop, while inductive virtual impedance...
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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