Line Voltage Switch Event Detection for LED Assemblies

A method for controlling a light source according to a plurality of illumination states subject to determine an event of a plurality of events, the method operating in a power-on mode and a power-off mode,

• the method comprising in the power-on mode, the steps of:
• operating a first clock circuit to generate a first clock signal;
• controlling 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, according to the current illumination state and the first clock signal;
• detecting an event of the plurality of events encoded within the input voltage waveform of the line voltage power supply;
• operating a first state processor to determine a next illumination state of the plurality of illumination states, based on a detected event and on a current illumination state and in accordance to the first clock signal;
• and
• in response to determining of a line voltage power-off event, changing the operation mode from the power-on mode to the power-off mode,
• the method comprising in the power-off mode, the steps of:
• disabling the power converter, the first clock circuit and the first state processor;
• enabling a timing circuit to start counting based on a second clock signal;
• determining a supply voltage and comparing the supply voltage to a first voltage threshold;
• if the comparing determines that the supply voltage is below the first voltage threshold, disabling the timer circuit and setting a flag to indicate that the light source is switched off;
• and
• in response to determining a line voltage power-on event, determining a power-off time value based on the counter of the timing circuit and changing the operation mode from the power-off mode to the power-on mode.

A method for providing a controller 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 controls 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 operates in a power-on mode and in a power-off mode, the method comprising the steps of:
• generating a first clock signal by a first clock circuit, wherein the first clock circuit operates in the power-on mode;
• determining a next illumination state of the plurality of illumination states by a first state processor, based on a detected event and on a current illumination state;
• wherein the first state processor operates in the power-on mode and in accordance to the first clock signal;
• generating a second clock signal by a second clock circuit, wherein the second clock circuit operates at least in the power-off mode;
• operating a control circuit 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;
• wherein
• in 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 starts counting, and
• in 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.