LED driving circuit under double-loop control

The utility model discloses an LED driving circuit under double-loop control. The LED driving circuit comprises an alternating-current power supply, a rectifying circuit, a load circuit, an output current sampling control loop and an input voltage sampling control loop which are connected in sequence. The load circuit includes a plurality of LED light sources connected in series or in parallel, a power triode Q1, a sampling resistor Rs and a bias resistor Rb; the output current sampling control loop includes a control triode Q2 and a sampling resistor Rs; and the input voltage sampling control loop includes a control triode Q3 and sampling resistors R1 and R2. Due to the adoption of the LED driving circuit under double-loop control, the power consumption of the power tube is enabled to decrease with the increase of the input voltage, the power efficiency is improved, the heat radiation is reduced, and the safety performance of lamps is increased.