Abstract
A novel bidirectional DC-DC converter with high conversion ratio is proposed in this paper. The proposed converter uses the three windings coupled-inductor to achieved high voltage conversion ratio. The primary side consist of a winding and secondary side consist of two windings, which these two windings are series to achieved high voltage gain.In the boost mode, a capacitor is parallel charged and series discharged by the coupled inductor. Thus, high step-up voltage gain can be achieved with an appropriate duty ratio. In the buck mode, a capacitor is series charged and parallel discharged by the coupled inductor. The bidirectional converter can have high step-down voltage gain.The stress voltage of main switches can be reduced, and efficiency can be improved. The operating principle and the steady-state analyses of the voltage gain are discussed. Finally, in 24V for low voltage, and 400V for high voltage, and 200W for output power, this converter is simulated in MATLAB.
Highlights
Because of the environmental pollution and global warming, renewable energy has become the research and the development priorities for most of the industrial countries
Bidirectional DC-DC converter is widely used for many green energy applications, such as wind power systems [ ], photovoltaic systems [ ], fuel cell and battery hybrid supplied power systems [ ]
Because the bidirectional DC–DC converters can transfer the power between two DC sources in either direction, these converters are widely used for renewable energy hybrid power systems, hybrid electric vehicle energy systems and uninterrupted power supplies [11]-[12]
Summary
Because of the environmental pollution and global warming, renewable energy has become the research and the development priorities for most of the industrial countries. Compare with [25], the proposed converter successfully developed to high conversion ratio bidirectional dc-dc converter with a three windings coupled inductors whit low duty cycle, and the switches voltage stress reduced and efficiency increase in boost and buck mode. When the proposed converter operated in the boost mode, a capacitor is parallel charged and series discharged by the coupled inductor.
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