Abstract
In this paper, a direct current (dc) converter with the abilities of bidirectional power transfer and soft switching characteristics is studied and implemented. The circuit schematic of the developed dc converter is built by a half-bridge converter and a center-tapped rectifier with synchronous rectifier. Under forward power transfer, a half-bridge circuit is controlled to regulate the low-voltage side at a stable value. For backward power transfer, a center-tapped rectifier with synchronous rectifier is regulated to control the high-voltage side at the desired voltage value, and the half-bridge circuit is operated as a voltage doubler rectifier. Active power devices are operated at zero-voltage switching using a series resonant technique on the high-voltage side with frequency modulation and inductive load operation. The practicability of the developed converter is established from experiments with a laboratory prototype circuit.
Highlights
To reduce air pollution and climate change, renewable energy sources with power electronic conversion have been demanded and developed in recent years
The soft switching characteristics were lost in this circuit topology in backward power transfer due to the non-symmetric circuits in both power flow operations
LLC resonant characteristicsswitches for both forward and backward power transfer, a on a center-tapped rectifier with synchronous are operated as synchronous rectifiers for parallel inductor is connected between half-bridge leg and split input capacitors on the high-voltage reducing the conduction losses on the low-voltage side
Summary
To reduce air pollution and climate change, renewable energy sources with power electronic conversion have been demanded and developed in recent years. The dual full-bridge resonant converter in reference [14] achieves soft switching characteristics in forward power transfer. LLC resonant characteristicsswitches for both forward and backward power transfer, a on a center-tapped rectifier with synchronous are operated as synchronous rectifiers for parallel inductor is connected between half-bridge leg and split input capacitors on the high-voltage reducing the conduction losses on the low-voltage side. Power switches on a center-tapped rectifier with synchronous switches are operated as the parallel inductor is usedfor onreducing the high-voltage sidelosses to achieve resonant synchronous rectifiers the conduction on the LLC low-voltage side.characteristics. Experimental power transfer, the parallel inductor is used on the high-voltage side to achieve LLC resonant results are presented to verify the feasibility of the proposed circuit. Duty cycle [9] in Circuit topology in switches, magnetic components, Reference [8]
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