Circuit for linearly driving LED illumination based on MCU-controlled color temperature switching

A circuit for linearly driving light-emitting diode (LED) illumination based on Micro-Controller Unit (MCU)-controlled color temperature switching, comprising:

• an AC power supply module, configured to supply an input voltage;
• an LED illumination module connected to the AC power supply module and an Single Chip Microcomputer (SCM) color temperature control module, comprising at least two LED bead strings at different color temperatures;
• the SCM color temperature control module, connected to the Alternating Current (AC) power supply module, an LED linear dimming driving and control module, and the LED illumination module, respectively, comprising an SCM input control module, an SCM processing module and a color temperature output control module, wherein the SCM input control module is configured to generate an enable signal to trigger the operation of the SCM processing module, the SCM processing module performs corresponding processing upon receiving the enable signal and controls the color temperature output control module, the color temperature output control module may output two Pulse-Width Modulation (PWM) control signals or multi-channel control signals, to control the ratio of current at the LED bead strings at high and low color temperatures, thus to realize the control of two or more color temperatures;
• and
• the LED linear dimming driving and control module, connected to the AC power supply module and the SCM color temperature control module, configured to control and adjust the illuminance of the LED illumination module and to realize a dimming function,
• wherein the LED illumination module comprises an LED bead string at a high color temperature and an LED bead string at a low color temperature,
• wherein the SCM color temperature control module outputs multi-channel control signals, and controls the ratio of current at the LED bead string at a high color temperature and current at the LED bead string at a low color temperature by the multi-channel control signals, thus to generate at least two different color temperatures.