The diode ACTS like a variable resistance, low when the charging current to the capacitor is high, then increasing in value as the current decreases with time.
该二极管象一个可变的电阻。当电容器的充电电流很大时，其阻值很低；而电流随时间变小时，其阻值增大。
2
The discharging loop includes a discharging diode connected to the current limiting charging resistance in parallel.