Abstract: A light emitting device includes a rectifier circuit, a mutual inductance device coupled to the rectifier circuit, an energy-storing capacitor coupled to a comm on node of a primary winding and a secondary winding of the mutual inductance device, a light emitting unit coupled to the mutual inductance device, a switch unit coupled to the light emitting unit, and a control circuit. The control circuit is coupled to the energy-storing capacitor and controls operation of the switch unit according to a voltage across the energy-storing capacitor.

Abstract: A light emitting device includes a rectifier circuit, a mutual inductance device coupled to the rectifier circuit, an energy-storing capacitor coupled to a common node of a primary winding and a secondary winding of the mutual inductance device, a light emitting unit coupled to the mutual inductance device, a switch unit coupled to the light emitting unit, and a control circuit. The control circuit is coupled to the energy-storing capacitor and controls operation of the switch unit according to a voltage across the energy-storing capacitor.