Circuit for temperature dependent current supply to LED

摘要

The circuit provides current to a light emitting diode or LED. A current source is connected to the LED to provide current. The circuit includes a logic gate (4) to regulate the current supply to the LED (1) depending on the LED temperature. The logic gate may reduce the current supply to the LED when a temperature threshold is exceeded and increase the current if the temperature falls below the threshold. The logic gate may provide a difference voltage from the flux voltage applied to the LED and a reference voltage with constant current through the LED. The difference voltage acts as a control signal for switching the LED current supply on or off.