Double-T type bidirectional DC-DC converter

The invention discloses a double-T-type bidirectional DC-DC converter, which comprises a pre-stage T-type circuit, a transformer, an Lr leakage inductor and a post-stage T-type circuit, the pre-stage T-type circuit comprises three groups of input capacitors Cin1, Cin2 and Cin3, and four groups of switch tubes SL1, SL2, SL3 and SL4; the post-stage T-type circuit comprises three groups of output capacitors Cout1, Cout2 and Cout3, and four groups of switch tubes SR1, SR2, SR3 and SR4; the switching tubes SL3 and SL4 and the switching tubes SR3 and SR4 only bear half of bus voltage, so that less switching loss is generated during light load, and the switching tubes SL3 and SL4 and the switching tubes SR3 and SR4 only bear half of direct-current bus voltage and can be realized by using devices which are cheaper, lower in rated current and lower in withstand voltage, an additional clamping diode does not need to be used, and the cost is reduced. The use of power devices is reduced, and the manufacturing cost is low