... the charging coil L1 induction the ac voltage,after the diode D1 half-wave rectifier,Into pulse ... timing),Trigger coil L2 induction the ac voltage,The diode D3 half-wave rectifier,R1 current-limiting, ... L4 on induction out all fell more high voltage, Breakdown spark plug, Make its jump fire, ... : Flywheel magnetic steel,charge coil L1,commutation diode D1 and energy-storage capacitor C1.B)Discharging ...