A new control method of series resonant converter (SRC) of which the device switching instants are always synchronized to the zero crossing points of the resonant current is proposed. Output voltage is controlled by proper selection of the switch modes by varying the duty ratio of powering mode and free resonant mode. Each switch mode is analyzed and the dc transfer function is obtained. It is also shown that the simulation results are good coinsided with the practical case. The SRC with the proposed control scheme shows many advantages such as low current switching stress, low switching loss, low electromagnetic interference(EMI), high input power factor and wide control range. Some of these characteristics are verified though the experiment.
This study deals with a bidirectional interleaved soft switching DC-DC converter for a wide range of input voltages. The proposed converter operates in complementary switching with the purpose of inductor size reduction and zero-voltage switching (ZVS) operation. The current ripple related to complementary switching is minimized by three-phase interleaved operation. The main characteristics of the proposed topology are its soft-switching method of operation and its simple structure. The soft-switching operation and the system efficiency of the proposed converter are verified by experimental results.
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