Patent ID: 9445479
Filing Date: 2016-09-13
CPC Classification: H05B,Y02B

Claim Text:
1. A dimming control method, comprising: conducting a first shunt load; obtaining an output signal of a dimming apparatus; detecting a conduction angle of the dimming apparatus according to the output signal; and controlling the first shunt load by a control signal according to the conduction angle to disconnect the first shunt load upon detecting that the dimming apparatus is in a low impedance status that is, there is a valid conduction angle of the dimming apparatus, and to keep the first shunt load conducted upon detecting that the dimming apparatus is in a high impedance status, that is there is no valid conduction angle of the dimming apparatus, wherein there is a small overlap zone of the control signal and the conduction angle, thereby the first shunt load is kept conducted for a short period of time.