Double loop controlled LED (Light Emitting Diode) driving circuit

The invention discloses a double loop controlled LED (Light Emitting Diode) driving circuit, which 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 connected in sequence, wherein the load circuit comprises a plurality of serial or parallel LED light sources, a power triode Q1, a sampling resistor Rs and a bias resistor Rb; the output current sampling control loop comprises a control triode Q2 and a sampling resistor Rs; and the input voltage sampling control loop comprises a control triode Q3 and sampling resistors R1 and R2. By using the double loop controlled LED driving circuit, power consumption of a power tube is reduced along with rise of input voltage, so that the power efficiency is increased, the heating is reduced, and the safety performance of a lamp is enhanced.