Color-temperature-adjustable LED driving device

The utility model discloses a color-temperature-adjustable LED driving device. The device comprises an LED driving module and a color-temperature adjusting and controlling module. The LED driving module includes an EMI filtering circuit, a rectifier bridge, a single-stage PFC controlling circuit, a transformer and two voltage-reducing constant-current controlling circuits. The voltage-reducing constant-current controlling circuits are electrically connected with the color-temperature adjusting and controlling module. The color-temperature adjusting and controlling module includes a Push switch, an optical-coupling driving triode, and an MCU signal processing and output PWM controlling circuit. When the switch is short pressed, the switch function is carried out; and when the switch is long pressed, the output voltage of one voltage-reducing constant-current controlling circuit drops linearly from 100% to 0%, while the output voltage of the other voltage-reducing constant-current controlling circuit rises linearly from 0% to 100%, so that the power is kept constant, and the color assortment of the load of two color temperatures can be output, thereby achieving the free adjustment of the color temperature. The color-temperature-adjustable LED driving device is simple in structure, convenient in operation and low in cost, thereby being suitable for popularization and application.