对用于高压场合的LCC谐振变换器进行了分析和研究, 采用基波近似法推导等效模型, 建立了谐振电路的大信号模型和等效模型, 对LCC谐振变换器的稳态特性进行分析, 采用了一种以输入阻抗角为限定条件的参数设计方法, 该方法可以实现谐振变换器零电压开关的同时兼顾谐振电流对效率的影响。在大信号模型的基础上, 建立了小信号模型, 得到输出电压与输入占空比之间的传递函数, 从而建立闭环系统, 实现电压的宽范围输出。通过Simulink仿真验证了所设计的LCC谐振变换器可实现全负载范围的零电压开关(ZVS), 说明了设计方法的可行性。

In this paper, the LCC resonant converter for high voltage applications is analyzed and studied. The equivalent model is derived by the fundamental approximation method. The large signal model of the resonant circuit is established. Based on the equivalent model and the large signal model, the LCC resonance is performed. A parameter design method is proposed after analyzing the steady-state characteristics of the converter. The method can realize zero voltage switching of the resonant converter while taking into account the influence of the resonant current on the efficiency. Based on the large-signal model, a small-signal model is established to obtain a transfer function between the output voltage and the input duty cycle, thereby establishing a closed-loop system and achieving a wide-range output voltage. The Simulink simulation verifies that the designed LCC resonant converter can realize ZVS switch with full load range, which verifies the feasibility of the design method.