Patent ID: 11723129

Abstract:
A voltage-regulating phase-cut dimmable power supply includes an electromagnetic interference filter circuit, a rectifier circuit, a power conversion circuit, a transformer, a rectifier and filter circuit, a phase-cut dimming signal conversion circuit, a first optocoupler, a dimming signal conversion circuit, a voltage comparison control circuit, a second optocoupler, a pulse width modulation (PWM) control circuit, and a voltage sampling circuit. The electromagnetic interference filter circuit, the rectifier circuit, the power conversion circuit, the transformer and the rectifier and filter circuit are electrically connected in sequence. The phase-cut dimming signal conversion circuit, the first optocoupler, the dimming signal conversion circuit, the voltage comparison control circuit, the second optocoupler and the PWM control circuit are electrically connected in sequence to an output end of the electromagnetic interference filter circuit. The voltage sampling circuit is electrically connected to the voltage comparison control circuit and an output end of the rectifier and filter circuit.