Dual-active bridge type converter for realizing wide-range soft switching

Abstract

The invention discloses a dual-active bridge type converter for realizing wide-range soft switching. The converter comprises a full-bridge switching network, an inductance energy storage network, a transformer transmission network and a rectification filter network which are connected in sequence, the input end of the full-bridge switching network is connected with an input direct current source, and the output end of the full-bridge switching network is connected with the input end of the inductance energy storage network; the input end of the rectification filter network is connected with the output end of the transformer transmission network; and the inductance energy storage network comprises a first inductor L1 and a first switch S1, and the first switch S1 is connected with the primary side of a second transformer T2 of the transformer transmission network in parallel to form a second parallel branch. The dual-active bridge type converter is simple in structure, the battery voltage is selected according to the second selector switch S2, then the first switch S1 is switched, and the number of transformers of the inductor energy storage network is changed, so it is guaranteed that even if the load voltage is changed, the input and output voltage transmission ratio k of the dual-active bridge type converter is kept unchanged.

Description

technical field [0001] The invention relates to the field of bidirectional DC / DC converters for mutual switching of battery voltages, in particular to a double active bridge converter for realizing wide-range soft switching. Background technique [0002] High efficiency and high power density are the goals and development direction of switching power converters. For a converter circuit composed of power devices, an increase in switching frequency will cause an increase in the switching loss of the power device, which will eventually lead to a decrease in converter efficiency. Especially for high-frequency converters, in order to reduce switching losses, soft switching technology has emerged, and its main implementation methods include zero voltage switching (Zero Voltage Switching, ZVS) and zero current switching (Zero Current Switching, ZCS). The dual active bridge (DAB) converter is widely used in the field of power conversion due to its characteristics of electrical isol...

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Problems solved by technology

[0003] However, in some occasions, the battery voltage needs to be switched between two different voltage levels. When the DC output voltage changes, the dual active bridge converter cannot meet all the requirements of the primary and secondary switch tubes under light load. Achieving Zero Voltage Switching

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