Power supply device and lighting equipment provided with power supply device

A power supply device for use in supplying power to a semiconductor light-emitting element in response to a switch activation, the power supply device comprising:

• a DC output generation module configured to receive AC power, convert the AC power into DC power, and output the DC power;
• a semiconductor light-emitting element configured to receive the DC power output from the DC output generation module, and to emit light;
• a receiving part configured to receive a dimming signal which is output from a dimming signal generator;
• and
• a control module including a timer and configured to control the DC output generation module to dim the semiconductor light-emitting element in accordance with the dimming signal received at the receiving part only after a predetermined time period from the switch activation as determined based on the timer,
• wherein the DC output generation module comprises first and second secondary windings, the first secondary winding configured to provide power to the semiconductor light-emitting element, and the second secondary winding configured to provide power to the control module, and
• wherein the control module is further configured to control the DC output generation module to supply, to the semiconductor light-emitting element, power insufficient to light on the semiconductor light-emitting element until the predetermined time period from the switch activation has elapsed as determined based on the timer.