Dual-Mode Output DImming Power Supply

A dual-mode output dimming power supply, comprising:

• an electromagnetic filter circuit, a switching power supply main control circuit, transformer, a rectifier filter circuit, a feedback regulation loop, a single-chip microcontroller circuit, a PWM drive circuit, a mode switching circuit, a dimming signal processing circuit, a MOS tube and a resistor;
• wherein, the electromagnetic filter circuit, the switching power supply main control circuit, the transformer and the rectifier filter circuit are sequentially coupled to one another;
• the rectifier filter circuit has an output terminal coupled to the feedback regulation loop and a positive electrode of a lamp;
• the feedback regulation loop is coupled to the switching power supply main control circuit;
• and the single-chip microcontroller circuit is coupled to the feedback regulation loop, the PWM drive circuit, the mode switching circuit and the dimming signal processing circuit;
• the PWM drive circuit has an output terminal coupled to a gate of the MOS tube;
• and
• the MOS tube has a drain coupled to the resistor and a source coupled to a negative electrode of the lamp.