1. 工作原理/Working principle ★ 当U2为正半周并且数值大于电容两端电压Uc时,二极管D1和D3管导通,D2和D4管截止,电流一路流经负载电阻RL,另一路对电容C充电。当Uc>U2,导致D1和D3管反向偏置而截止,电容通过负载电阻RL放电,Uc按指数规律缓慢下降。 ★ The diode D1&D3 work, D2&D4 cut off, the current flows through the load resistance RL in a loop and charge the capacitor C up when U2 in the pos