In this circuit , we use many kinds of negative feedback to modify the ou tput wave , which can decrease the distortion . and we use the high - voltage and high frequency capacitance efficiency , which can decrease the disturbance of output signal of variable frequency source for the test of part discharge 采用了多種負(fù)反饋回路修正輸出波形,使得輸出電壓波形的失真度很小;并且在電路中有效利用高壓高頻電容,減小了變頻電源輸出的電壓對局部放電試驗(yàn)時(shí)的干擾。