Particularly, in the classical dual-active-bridge (DAB) converter, the current difference between the source and leakage inductance of high-frequency transformer potentially results in circulating current. This circulating current further causes the increased voltage stress, voltage overshoots, and conduction losses in the circuit. In view of this, a combination of dualswitch-forward (DSF) snubber and pre-charging method assisted isolated bi-directional DC-DC (BDC) converter is described in this study for electric vehicle application. The proposed configuration effectively diminishes the adverse impact of circulating current while reducing conduction loss, as well as switching stress. The working principle and corresponding circuit configurations are extensively discussed during both modes of operation. The control-to-output transfer functions have been obtained, and it has been confirmed that the system is stable for both modes of operation. The experimental prototype of 480 W for 20 kHz application has been developed using DSP TMS320F28335 to verify the practicality of the proposed converter. The experimental results assure that the voltage spike is successfully alleviated when the converter is operated with the proposed configuration. Finally, the comparative loss analysis has been carried out, which determines that the DSF snubber circuit with pre-charging method provides a better solution compared to classical converters/techniques.
This work presents an isolated full-bridge bidirectional DC/DC converter for battery charging/discharging operation. In the proposed scheme, the full-bridge isolated topology is used for the DC-DC conversion. The full bridge scheme is widely used for the high power application. High frequency transformer is used for isolation purpose. This paper deals with the effect of leakage inductance of high frequency transformer in the charging mode as well as discharge mode of operation. Phase shifted topology is used as control scheme. Effect of leakage inductance on output voltage, output current is shown in simulation. Simulation results are obtained using PSIM Software with a 7.75-kW load. Test result is given for effectiveness of the study. Battery rating 310 V, 25 A.
In this paper, a modified flyback snubber circuit for isolated bidirectional DC-DC converter has been introduced. The soft switching isolated snubber circuit provides an alternative path for the current difference created due to source inductance and leakage inductance. The auxiliary snubber circuit operates during the step-up conversion, and it only persists of the two semiconductor switch, two inductors one diode and two capacitors. Both semiconductor devices (G1, G2) of flyback snubber circuit achieve soft switching during turn ON and turn OFF condition. The PWM technique has been used to control the semiconductor devices. The different mode of operation has been discussed in detail. The effective performance of proposed converter system has been validated with the PSIM simulation tool. The proposed converter is compared with the active clamp converter based on efficiency. The loss comparison proves that flyback snubber circuit has high efficiency compared to active clamp converter.
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