Patent ID: 8884540

Claim:
A power supply device for supplying power to a semiconductor light-emitting element in response to a switch activation, the power supply comprising: a control module configured to: detect output of DC power from a DC output generation module, following detection of the output of DC power from the DC output generation module, receive a dimming signal output from a dimming signal generator, and following receipt of the dimming signal, control the DC power in accordance with the dimming signal including controlling the DC output generation module to dim or light a semiconductor light-emitting element based on the dimming signal, wherein controlling the DC power in accordance with the dimming signal is performed only after a predetermined time period from a switch activation, wherein the control module includes a timer, the timer being configured to count time until the predetermined time period elapses, wherein the timer is configured to start counting the time in response to the DC power supplied from the DC output generation module after the switch activation, and wherein the control module is further configured to control the DC output generation module to supply the DC power, to the semiconductor light-emitting element, at a level that does not cause the semiconductor light-emitting element to light, until the predetermined time period has elapsed as determined based on the timer.