Drive circuit of LED lamp

The invention discloses a controller for an LED lamp, wherein the controller enables an average current passing through the LED to be basically constant when the LED lamp is lightened. The controller comprises a microprocessor, an output control module and three LED lamp drive circuits. The control terminal of the output control module is connected with the microprocessor. Each LED lamp drive circuit consists of a current amplification module and an electronic switch module. The control terminal of the current amplification module is connected with a signal source through an input resistance. The output terminal of the current amplification module is connected with a power supply anode of an LED lamp through the LED lamp. The output terminal of the electronic switch module is connected with the control terminal of the current amplification module. The control terminal of the electronic switch module is connected with the negative feedback point of the current amplification module. After being connected togeth