High-transformation ratio bidirectional DC/DC converter based on coupling inductor

Abstract

The invention discloses a high-transformation ratio bidirectional DC/DC converter based on a coupling inductor, and belongs to the field of power electronics. The bidirectional DC/DC converter comprises a high-voltage power supply end VH, a low-voltage power supply end VL, a high-voltage filter capacitor CH, a low-voltage filter capacitor CL, a high-transformation ratio boost-buck structure composed of an intermediate capacitor C1, a coupling inductor T, a first switch tube S1 and a body diode D1 thereof, a third switch tube S3 and a body diode D3 thereof, a fourth switch tube S4 and a body diode D4 thereof and an active clamping circuit consisting of a clamping capacitor C2, a second switch tube S2 and a body diode D2 of the second switch tube S2. The high-transformation ratio bidirectional DC/DC converter is simple in circuit structure and can realize the higher voltage transformation ratio, the voltage stress of a switching device is small, and the circuit loss is reduced.

Description

technical field [0001] The present invention relates to a novel bidirectional DC / DC converter, specifically a bidirectional DC / DC converter that utilizes coupled inductors to achieve a high voltage transformation ratio, and can be applied to photovoltaic energy storage systems and other bidirectional DC / DC converters that require high voltage transformation ratios. DC power conversion occasions. Background technique [0002] In recent years, in response to increasingly serious environmental problems and energy crises, renewable energy power generation systems represented by solar energy and wind energy have been extensively studied. However, it is deeply affected by environmental factors, and the output power shows obvious intermittent and randomness. To improve power quality, this type of power generation system can be connected to energy storage equipment to store and release energy to maintain the stability of the DC bus voltage. In these new energy power generation sys...

AI Technical Summary

Problems solved by technology

Theoretically, the high voltage transformation ratio of traditional bidirectional DC / DC converters can be achieved through extremely small or extremely large duty cycles. However, due to the influence of the parasitic parameters of the circuit itself, when the duty cycle reaches a certain value, the voltage can no longer be boosted. or power down, which will cause serious reverse recovery loss and EMI problems at the same time

In addition, the high voltage ratio makes the voltage stress of each switch tube larger, which increases energy loss

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