Dimming control method and apparatus and dimming system

摘要

Embodiments of the present invention disclose a dimming control method and apparatus and a dimming system. The method according to an embodiment of the invention includes: detecting a conduction angle of a dimming apparatus according to an output signal; and controlling a first shunt load according to the conduction angle to disconnect the first shunt load upon detecting a valid conduction angle of the dimming apparatus and to keep the first shunt load conducted upon detecting no valid conduction angle of the dimming apparatus, thereby lowering power consumption.

主权项

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.