Line Voltage Switch Event Detection for LED Assemblies

摘要

A controller for controlling the illumination state of a light source of solid state lighting devices such as LED or OLED assemblies, is presented. The controller controls the light source according to a plurality of illumination states subject to determine an event of a plurality of events. The controller controls a power converter that converts power derived from an input voltage waveform of line voltage power supply into a drive signal for the light source. The controller determines an event of a plurality of events encoded within the input voltage waveform of the line voltage power supply. A first state processor determines a next illumination state of the plurality of illumination states, based on the determined event and based on the current illumination state. Line voltage Switch event detection is performed while no power is available at the line voltage terminals.

主权项

1. A controller configured to control a light source according to a plurality of illumination states subject to determine an event of a plurality of events, wherein the controller is configured to control a power converter that converts power derived from an input voltage waveform of a line voltage power supply into a drive signal for the light source; the controller configured to operate in a power-on mode and in a power-off mode, the controller comprising:
a first clock circuit configured to generate a first clock signal, wherein the first clock circuit is enabled to operate in the power-on mode; a first state processor configured to determine a next illumination state of the plurality of illumination states, based on a detected event and on a current illumination state; wherein the first state processor is configured to operate in the power-on mode and in accordance to the first clock signal; a second clock circuit configured to generate a second clock signal, wherein the second clock circuit is enabled to operate at least in the power-off mode; a control circuit configured to operate in the power-off mode and in accordance to the second clock signal, the control circuit comprising a timing circuit for determining a power-off time value; whereinin response to detection of a line voltage power-off event, the controller changes the operation mode from the power-on mode to the power-off mode and the timing circuit is enabled to start counting, andin response to detection of a line voltage power-on event, the controller changes the operation mode from the power-off mode to the power-on mode.