基于开关电容和耦合电感的交错并联型高电压增益双向DC-DC变换器

Interleaved High Gain Bidirectional DC-DC Converter with Switched Capacitor and Coupled Inductor

提出一种基于开关电容和耦合电感的交错并联型高电压增益双向DC-DC变换器。通过并联通道数的增加,使得变换器具有更高的电压增益、更大的输出功率和更小的器件电压/电流应力。通过引入耦合电感,不仅降低了通道内电流纹波,同时可使各通道的电感量最小,进一步提升变换器的效率和功率密度。而且,较小的电感量可加快开关电容自动均流速度,仅需简单的控制方法,有利于提高电路的可靠性和实用性。制作了一台500W样机,以验证该拓扑和理论分析的有效性。

This paper proposes a high voltage ratio interleaved bidirectional DC-DC converter with switched capacitor and coupled inductor. The number of parallel channels is increased to realize higher voltage gain, greater output power, and lower device voltage/current stress. The coupled inductors can reduce current ripples and minimize the inductance in each channel, further increase the power density and efficiency of the converter. Additionally, low inductance accelerates the dynamic process of automatic current sharing by switched capacitors. A simple control strategy is adopted to facilitate circuit applications. Experimental verification of the proposed topology is performed using a 500-W prototype converter built in the laboratory.