Abstract: A power supply circuit for supplying power to a microcontroller unit (MCU) comprises: a MCU, a MCU power supply module coupled to the MCU, a load, and a charging capacitor coupled to two ends of the load. The MCU power supply module is coupled to an input power source, and the MCU power supply module is coupled to the charging capacitor via a MOS tube. The MOS tube is coupled to a parasitic diode.

Abstract: The present disclosure provides a dimmer control circuit, a dimmer control method and a lighting device. The dimmer control circuit includes: a dimming output end configured to connect to a dimmer, a load terminal configured to connect to a load, a detection-control module, and a current holding module. An input end of the detection-control module is connected to an output end of the dimmer. An output end of the detection-control module is configured to: control the current holding module to connect to the load terminal when the dimming output end is connected to a SCR-based leading-edge phase cut dimmer, and control the current holding module to disconnect from the load terminal when the dimming output end is not connected to the SCR-based leading-edge phase cut dimmer. The current holding module is configured to supply a holding current to the SCR-based leading-edge phase cut dimmer connected to the dimming output end.

Abstract: A color-temperature adjustable light-emitting diode (LED) lighting device and a method for adjusting the color temperature of an LED lighting device are provided. The color-temperature adjustable LED lighting device includes: a power supply module, a micro-control unit (MCU), an adjustable LED driving power supply having a positive output terminal and a negative output terminal, a cool white LED array, a warm white LED array, a first switch circuit, a second switch circuit, a first current detection circuit, and a second current detection circuit. The power supply module is connected to an input terminal of the MCU and an input terminal of the adjustable LED driving power supply.

Abstract: A color-temperature adjustable light-emitting diode (LED) lighting device and a method for adjusting the color temperature of an LED lighting device are provided. The color-temperature adjustable LED lighting device includes: a power supply module, a micro-control unit (MCU), an adjustable LED driving power supply having a positive output terminal and a negative output terminal, a cool white LED array, a warm white LED array, a first switch circuit, a second switch circuit, a first current detection circuit, and a second current detection circuit. The power supply module is connected to an input terminal of the MCU and an input terminal of the adjustable LED driving power supply.

Abstract: The present disclosure provides a dimmer control circuit, a dimmer control method and a lighting device. The dimmer control circuit includes: a dimming output end configured to connect to a dimmer, a load terminal configured to connect to a load, a detection-control module, and a current holding module. An input end of the detection-control module is connected to an output end of the dimmer. An output end of the detection-control module is configured to: control the current holding module to connect to the load terminal when the dimming output end is connected to a SCR-based leading-edge phase cut dimmer, and control the current holding module to disconnect from the load terminal when the dimming output end is not connected to the SCR-based leading-edge phase cut dimmer. The current holding module is configured to supply a holding current to the SCR-based leading-edge phase cut dimmer connected to the dimming output end.