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Bipolar junction transistors need base current and sufficient positive voltage to the collector in order to provide amplification.
How led driver circuit works. Simple led light emitting diode circuit diagram in electronics an led circuit or led driver is an electrical circuit used to power a light emitting diode led. There are two main types of drivers those that use low voltage dc input power generally 5 36vdc and those that use high voltage ac input power generally 90 277vac. It is used as an optoelectronic device. Current can increase in a led if we operate the.
However it conducts in forward bias the same as the p n junction diode. In most applications using a low voltage dc input led driver is recommended. If current increase in a led beyond predetremind level as recommended by the manufacture the led will just fail. The circuit must provide sufficient current to light the led at the required brightness but must limit the current to prevent damaging the led.
Led drivers that use high voltage ac power are called off line drivers or ac led drivers. A simple transformer less 230v led driver circuit is built in this project. The main components of this project are the x rated capacitor the zener diode and the resistor which limits the current in the zener diode. How the 230v led driver circuit works.
Leds use dc voltage to work unlike normal leds the high power leds that used in tv works at 3vdc per led. Therefore the transistor cannot turn on. Now let me ask you a simple question. The purpose of led driver board is to keep current constant in the led.
When the switch of the circuit is open no current flows to the base of the transistor.
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