US Patent No. 10,462,863

DIMMER INTERFACE HAVING REDUCED POWER CONSUMPTION


Patent No. 10,462,863
Issue Date October 29, 2019
Title Dimmer Interface Having Reduced Power Consumption
Inventorship Zhi Hua Song, San Jose, CA (US)
Assignee Lumileds LLC, San Jose, CA (US)

Claim of US Patent No. 10,462,863

1. A light emitting diode (LED) light system comprising:a plurality of LED devices;
a driver circuit electrically coupled to the plurality of LED devices; and
a dimmer switch interface comprising:
a transformer having a first winding and a second winding, the first winding being electrically coupled to at least one input terminal to receive a dimmer input voltage, the second winding being electrically coupled to the driver circuit to provide a dimmer output voltage, to the driver circuit, based on the dimmer input voltage, and the first winding being magnetically coupled to the second winding,
a current source electrically coupled to the second winding, and
a control circuit communicatively coupled to the current source and configured to:
detect the dimmer output voltage,
on a condition that the dimmer output voltage is below a threshold, determine that a dimmer switch is in a standby mode, and
on a condition that the dimmer switch is in the standby mode, provide a control signal to the current source, the control signal having a cycle comprising a first portion during which the control signal has a first duty cycle and a second portion during which the control signal has a second duty cycle greater than the first duty cycle.