Power supply having high power factor and low standby power consumption

A power supply circuit comprising:

• an anti-electromagnetic interference circuit configured to receive input alternating current power and to output filtered alternating current power;
• a rectifier circuit configured to rectify the filtered alternating current power;
• a current correction circuit configured to perform passive power factor correction on the rectified alternating current power;
• a single-ended flyback converter circuit coupled to the output of the current correction circuit, the single-ended flyback converter circuit comprising:
• a power supply controller;
• an output transformer coupled to the power supply controller;
• a secondary transformer coupled to the output transformer;
• and
• an optocoupler coupled between the power supply controller and the secondary transformer;
• and
• a dimming control circuit coupled between the output of the single-ended flyback converter circuit and a light load, the dimming control circuit being coupled to the secondary transformer,
• wherein the current correction circuit is configured to control a waveform of the rectified alternating current power to follow a current output to the light load in order to provide passive power factor correction.