Method and apparatus for dimming

摘要

Aspects of the disclosure provide a lighting system. The lighting system includes a transformer having a primary winding on a receiving path and a secondary winding on a delivering path. The receiving path receives electric energy regulated based on a dimming angle. The delivering path delivers the received electric energy. According to an aspect of the disclosure, the lighting system includes a secondary switch, and a dimming controller. The secondary switch is switched on to couple a light source, such as an LED array, and the like, with the delivering path to emit light in response to the delivered electric energy and is switched off to decouple the light source from the delivering path. The dimming controller is configured to detect the dimming angle based on an electrical property of the delivering path. Then, the dimming controller switches on and switches off the secondary switch based on the dimming angle.

主权项

1. A lighting system, comprising:
a switch configured to be switched on to couple a light source with a delivering path to emit light in response to electric energy delivered to a receiving path and switched off to decouple the light source from the delivering path, the receiving path receiving the electric energy regulated based on a dimming angle; and a controller configured to detect the dimming angle, and switch on and switch off the switch based on the dimming angle, the controller further configured to measure a width of a signal that is a function of the dimming angle, the signal being generated based on a voltage signal on the delivering path.