RCD (Resistance Capacitor Diode) absorption circuit, dimmable LED (Light-Emitting Diode) power supply system and dimming method

The invention relates to a RCD (Resistance Capacitor Diode) absorption circuit, a dimmable LED (Light-Emitting Diode) power supply system using the circuit and a dimming method. The RCD absorption circuit comprises a first resistor, a capacitor and a diode, wherein the first resistor is connected with the capacitor in parallel and then is connected with the diode in series; one end of the first resistor connected with the capacitor in parallel is connected with the cathode of the diode, and the other end of the first resistor forms a first terminal of the RCD absorption circuit; and the anode of the diode forms a second terminal of the RCD absorption circuit. The RCD absorption circuit is characterized in that the RCD absorption circuit also comprises a RCD absorption circuit power regulating component connected with the first resistor and the capacitor in parallel. The RCD absorption circuit has the beneficial effects that a dimmer of the absorption circuit is used to change the power transmitted to the output end in starting, so that the output current of multiple groups of LED lighting driving power supplies can achieve a consistent effect, and LEDs can simultaneously and consistently emit light.