一种适合宽范围输出的双向DC-DC变换器

Bidirectional DC-DC converter suitable for wide output range

提出一种适合宽范围输出的双向DC-DC变换器。该变换器结构与传统LLC双向DC-DC变换器类似,但通过开关管复用以及将谐振电感增加绕组复用为一个反激变压器,构造了多种工作模式。变换器采用PWM调制,正向功率传输时有中、低两种电压增益模式,反向功率传输时有高、中、低三种电压增益模式,所有模式中均可实现全负载范围内的软开关状态。对各模式的工作原理、增益公式推导进行了详细的描述。最后以满足4-5节12 V蓄电池的充放电为前提,给出变换器设计和控制方法,并搭建了相应参数的实验样机。实验结果验证了该变换器分析的有效性。

A bidirectional DC-DC converter suitable for wide range output was proposed.The structure of the converter is similar to that of the traditional LLC bi-directional DC-DC converter,but a variety of operating modes were constructed by multiplexing the switching and multiplexing the resonant inductor increasing winding as a flyback transformer.In the converter,by adopting PWM modulation,forward power transmission has medium and low voltage gain mode,reverse power transmission has high,medium and low voltage gain mode,all modes can achieve the soft switching state within the full load range.The working principle of each mode and derivation of gain formula are described in detail.Finally,on the premise of charging and discharging 4-512 V batteries,the design and control method of the converter is given,and the experimental prototype of the corresponding parameters is built.Experimental results verify the effectiveness of the proposed converter analysis.