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A new adaptive auxiliary circuit scheme is proposed for the phase-shift full-bridge converter that provides zero-voltage-switching (ZVS) for all switches for a wide variation in load and input range. Complementary voltage seconds works on the auxiliary inductor to provide adaptive energy for the lagging leg switches. Therefore, ZVS operation over a wide load conversion range is achieved without significantly...
A novel full-bridge converter suitable for low-voltage high-current output applications is proposed. It realizes ZVS for all switches over the entire load range with the use of voltage complementary auxiliary network on the primary side. A current-doubler rectifier is adopted on the secondary side which has no duty cycle loss and no secondary voltage spike. The operation principle and characteristic...
An improved full-bridge (FB) pulse-width-modulated (PWM) converter is proposed featuring zero-voltage-switching (ZVS) of all primary switches in the entire line and load range. Compared to the conventional full bridge dc/dc converter, the proposed converter achieves ZVS with substantially reduced duty-cycle loss and circulating current. The operation principle of the circuit is described and design...
A novel full-bridge (FB) pulse-width-modulated (PWM) converter features zero-voltage-switching (ZVS) of all primary switches in the entire line and load range is described. In contrast to conventional full bridge converter, ZVS is achieved by utilizing energy stored in inductive components of the auxiliary circuit. The auxiliary inductors do not appear as series inductances in the power transfer path,...
A novel passive correction approach is proposed in this paper. By adding a passive auxiliary circuit to the ac side of the rectifier with dc-side C filter, the input currents and power factor can be improved. According to distinctive configurations of the auxiliary circuits, eight low harmonic input rectifier topologies are derived. Three rectifier topologies with better comprehensive performance...
In this paper, an optimal design method of three-phase rectifier with near-sinusoidal input currents (RNSIC) is proposed. By using the proposed method, high power factor could be achieved as well as low input current harmonics, making the converter more practical. Moreover, based on the operation principle analysis of RNSIC, characteristic of the rectifier is discussed. Experimental results form three...
In an electric vehicle power system, a step-up converter is required to increase the voltage from 24 V to 270 V. To achieve such a high voltage boost ratio, there are several challenges that must be overcome: tackling the leakage inductance of the isolation transformer; reducing the voltage stress on the power switches; and guaranteeing fast dynamic response and high efficiency Thus, innovative approaches...
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