弹光调制高压谐振电路设计

Design of high voltage resonant circuit based on the photoelastic modulator

针对弹光调制需要高Q值、高电压、高稳定性驱动电路的特点，设计了一种基于LC谐振升压原理的高压驱动电路，该电路主要由输入波形转换电路、功率放大电路、充放电回路、阻抗匹配电路和反馈信号采集电路组成。采用低磁导率磁芯制作的高品质因数电感，使电路在输出高电压的同时，降低了对直流电源电压的要求。实验结果表明：在弹光调制干涉具谐振频率50．04 kHz下，谐振电路的输出电压在0～1200 VP-P可调，所需直流电源电压最大幅值为29 V。电路具有较强的带负载能力，可以满足弹光调制晶体的驱动需求。

Because photoelastic modulator requires the drive circuit of high Q value,high voltage and high stability,a high voltage drive circuit based on LC resonant boost principle is designed. The circuit is mainly composed of the in-ut waveform converting circuit,power amplifier circuit,charge and discharge circuit,impedance matching circuit and feedback signal acquisition circuit. A high quality factor inductance is made by low permeability core. The output voltage of the circuit is higher,while the DC power supply voltage requirements is lower. The experiments show that：at the resonant frequency 50. 04 kHz of photoelastic modulator,the adjustable output voltage of the circuit is 0 to 1200VP-P,the maximum supply voltage of input DC power is 29 V. This circuit has a strong load capacity and can fully meet the demand to drive the photoelastic modulator crystal.