Patent ID: 8633655

Claim:
An LED output power adjusting device, comprising: an analog/digital conversion and detection circuit, which is connected to a load of an LED lighting device to detect an analog forward voltage of an LED array of the LED lighting device and to convert the analog forward voltage into a corresponding digital signal; a computation and control unit, which is connected to the analog/digital conversion and detection circuit for performing evaluation processing on the digital signal of the forward voltage supplied from the analog/digital conversion and detection circuit in order to determine an output current and supplying a digital current control signal corresponding to the output current; a digital/analog conversion control circuit, which is connected to the computation and control unit and a constant-current drive circuit of the LED lighting device to convert the digital current control signal from the computation and control unit into a corresponding analog current control signal and to feed the analog current control signal to the constant-current drive circuit of the LED lighting device, so that the constant-current drive circuit applied the output current that is obtained through the evaluation and computation of the computation and control unit to drive the LED array of the LED lighting device in order to make an output power of the LED lighting device approximating a constant power condition; and a power supply circuit, which is connected to the analog/digital conversion and detection circuit, the computation and control unit, and the digital/analog conversion control circuit to supply working powers to the analog/digital conversion and detection circuit, the computation and control unit, and the digital/analog conversion control circuit.