CLTC resonant soft switching bi-directional converter

Abstract

The invention relates to a bi-directional converter, and provides a novel DC converter circuit topology with relatively high conversion efficiency. Zero-voltage turn-on (ZVS) and zero current turn-off (ZCS) of switch tubes are achieved; the efficiency and the power density of the converter are improved; and the gain range is expanded. Therefore, a CLTC resonant soft switching bi-directional converter comprises three parts, namely a main transformer primary side full-bridge circuit, a CLTC resonant circuit, a main transformer secondary side full-bridge circuit; the three parts are sequentially connected with one another; the CLTC resonant circuit is provided with an auxiliary transformer Tr2; a primary side of the auxiliary transformer Tr2 is spliced to the primary side of the main transformer Tr1; a secondary side of the auxiliary transformer Tr2 is connected with the secondary side of the main transformer Tr1; and the positions of dotted terminals of the primary side and the secondary side of the auxiliary transformer Tr2 and the primary side and the secondary side of the main transformer Tr1 are in the same direction. The bi-directional converter is mainly applied to designing and manufacturing of the bi-directional DC converter.

Description

technical field [0001] The invention relates to a bidirectional DC converter, in particular to a CLTC resonant soft-switching bidirectional converter. Background technique [0002] Today, with the increasingly serious problems of energy depletion and environmental deterioration, people pay attention to the rational and effective use of energy. In distributed power generation systems such as photovoltaics, wind turbines, fuel cells, and micro-gas turbines, energy storage systems are required to achieve stable and economical operation of the system through bidirectional DC / DC converters. In electric vehicles, energy storage power stations and other applications, bidirectional DC / DC is also required to achieve stable, efficient and fast bidirectional charging and discharging. Especially when the voltage gain is high and the current stress is high, the bidirectional DC / DC efficiency loss increases sharply, which also increases the difficulty of heat dissipation design. At pres...

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Problems solved by technology

However, the power density of the above circuits is low, the switching tube ZCS cannot be realized and the light load ZVS cannot be realized

LLC resonant DC / DC converter has high operating frequency and high power density, the secondary diode can realize ZCS, and light load can realize ZVS, but this circuit cannot realize bidirectional energy conversion

On the basis of the LLC resonant converter, the CLLC bidirectional DC / DC converter with a bilateral resonant structure can realize bidirectional energy conversion, but when the load is heavy, the gain curve is difficult to lift, and the gain range is too narrow

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