利用在起动瞬间三相干扰触发脉冲同时存在的特点，设计出抗干扰电路，消除了在按下起动按钮的瞬间出现的干扰触发脉冲。利用电容的滤波作用，在变换电路的输入端加接滤波电容，消除了在移相至某区域出现的低幅值超前干扰触发脉冲；利用电容的充电效应，使得每次起动时，移相电压都由一较低值渐增至给定值，实现了限流起动的要求。 By using the characteristic that the three-phase interference trigger pulse exists at the moment of starting, the anti-interference circuit is designed to eliminate the interference trigger pulse which occurs when the start button is pressed. The use of capacitor filtering, the conversion circuit input filter capacitor connected to eliminate the phase shift to a region of low-amplitude advanced interference trigger pulse; the use of capacitor charging effect, making each start, the phase-shifted voltage Increasing from a lower value to a given value, to achieve the requirements of current-limit start.