Patent ID: 9179508
Filing Date: 2015-11-03
Classification: H05B,Y02B

Abstract:
1. A solid-state lighting (SSL) system having dimming capability, comprising: an alternating current to direct current (AC/DC) converter configured to convert a scaled non-phase-cut AC voltage to a DC voltage; a dim control signal generating circuit configured to generate a dim control signal based on said scaled non-phase-cut AC voltage; and an SSL driver configured to generate, based on said DC voltage, a DC supply voltage for powering a light-emitting load, said SSL driver including dim control circuitry configured to control the brightness of light emitted by said light-emitting load based on the dim control signal generated by said dim control signal generating circuit, wherein said dim control circuit com rises current control circuit configured to control the magnitude of current flowing through said light-emitting load depending on the value of said dim control signal and pulse-width modulation (PWM) circuit configured to periodically disrupt current flow through said light-emitting load, and said dim control circuitry is configured to employ said current control circuitry to control dimming of light emitted by said light-emitting load over a first range of dimming levels and is configured to employ said PMW circuitry to control dimming of light emitted by said light-emitting load over a second range of dimming levels.