This paper proposes a novel capacitive power transfer (CPT) system with switchable compensation for achieving constant current (CC) or constant voltage (CV) output against load and coupling capacitance variations. Meanwhile, a parameter design method is proposed to ensure a low input impedance angle at constant operation modes. Mathematical models of voltage and current gains are established, which are used to analyze the CC and CV operation modes of the proposed CPT system. Two relays are adopted in receiver to reconfigure the compensation network to switch the CC mode and CV mode. The communication between the transmitter and receiver is not needed, and complex control is not required either for changing two operation modes. An experimental setup with 2A output current in CC mode and 96 V output voltage in CV mode is constructed. Experimental results show that the maximum variation of the output current is 4.0% in CC mode, and the maximum variation of the output voltage is 5.0% in CV mode, when the load resistance and coupling capacitance vary from 24 to 72 ohms, and 500 to 1000 pF, respectively. Experimental results verify the CC/CV output and the effectiveness of the proposed parameter design method.

本文提出了一种具有可切换补偿的新型电容式功率传输（CPT）系统，以针对负载和耦合电容变化实现恒定电流（CC）或恒定电压（CV）输出。同时，提出了一种参数设计方法，以确保恒定工作模式下的低输入阻抗角。建立了电压和电流增益的数学模型，用于分析所提出的CPT系统的CC和CV操作模式。接收器采用两个继电器来重新配置补偿网络，以切换CC模式和CV模式。不需要发送器和接收器之间的通信，也不需要复杂的控制来更改两种操作模式。构建了一个实验设置，在CC模式下具有2A的输出电流，在CV模式下具有96 V的输出电压。实验结果表明，当负载电阻和耦合电容在24至72 ohms和500至500 ohm之间变化时，在CC模式下，输出电流的最大变化为4.0％，在CV模式下，输出电压的最大变化为5.0％。分别为1000 pF。实验结果验证了CC / CV输出和所提出的参数设计方法的有效性。