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How to analyze LED driver characteristics?
2018-10-23 22:09:22
To achieve the purpose of illumination, the LED needs a forward voltage to allow current to flow. The LED driver therefore has to provide a forward bias to the LED to illuminate it. The level of illumination or brightness of an LED is usually proportional to the magnitude of the forward current. In addition, the current through the LED should not exceed the rated current specified by the device, otherwise it may cause permanent damage. Thus a constant current drive circuit is the ideal solution to control the current at the correct level of driving the LED. In other words, the LED drive circuit is a power conversion circuit that provides a constant current instead of a constant voltage. The LED driver circuit should contain at least one voltage detection circuit and one current switch circuit.
When the voltage detecting circuit detects different voltage levels of the power supply, it sends a signal to the current opening circuit, and then the current switching circuit is automatically activated, and the electrical setting of the LED is re-adjusted using a predetermined current value, thereby effectively lighting As many LEDs as possible.
High-brightness LEDs have gained a foot in many lighting applications due to their ability to emit more light than traditional lighting sources. But these LEDs generate more heat than traditional LEDs. Therefore, LED drivers require overheat protection to avoid damage from the heat that is emitted during continuous operation.