Bi-directional hybrid bridge dc-dc converter and half-period volt-second area balance control method

Abstract

The invention discloses a bidirectional hybrid bridge DC-DC converter and a half-cycle volt-second area balance control method, which belong to the direction of high-frequency switching power supply in the field of power electronics. The bidirectional hybrid bridge DC-DC converter disclosed by the invention is composed of a main circuit and a control circuit; the main circuit is composed of an input side, a high-frequency transformer and an output side; the control circuit includes a controller and a drive circuit. Based on the proposed bidirectional hybrid bridge DC-DC converter, half-cycle volt-second area balance control is employed. By adjusting the duty cycle of the input side and the half-cycle volt-second area balance control at the same time, the effective value of the leakage inductance current can be reduced in the stage when the power is not transmitted, the reactive current can be reduced, and the circuit on-state loss and circulating current loss caused by the current can be reduced. At the same time, a wide range of soft switching of each switch tube device can also be realized. In addition, the half-cycle volt-second area balance control can realize real-time control of bidirectional power flow while reducing the complexity of the control unit.

Description

technical field [0001] The present invention relates to a bidirectional DC-DC converter and a half-period volt-second area method for controlling the converter, in particular to a high-frequency isolated bidirectional hybrid bridge DC-DC converter and its half-period volt-second area method The balance control method belongs to the direction of high-frequency switching power supply in the field of power electronics. Background technique [0002] With the development of power electronics technology, the demand for bidirectional, high-frequency isolation, and high-efficiency converters is gradually increasing, especially in various power supply systems such as solid-state transformers including energy storage units, high-voltage direct current transmission, and micro-grids. Because these systems need to control the energy of charging and discharging the energy storage unit, the converter is required to have the characteristics of bidirectional controllable power flow; consider...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the problems that the above-mentioned converter cannot realize large-scale soft switching and wide voltage gain under bidirectional power flow, and the controller design is complex, the present invention discloses a bidirectional hybrid bridge DC-DC converter and half-period volt-second area balance control Method, the technical problem to be solved is to provide a bidirectional hybrid bridge DC-DC converter topology and its half-period volt-second area balance control method for the bidirectional DC-DC converter occasion

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