LEDs are widely used in the industry because of their wide application and reasonable price. Whether it is a festive decorative lamp or a variety of lamps used in the home, LED driving circuits are used. Because of its reduced energy consumption, it can work stably for a long time. Today I will introduce the LED lighting driver circuit from a practical LED circuit.
Light-emitting diodes (LEDs) have become an alternative to today's lighting technology due to their high efficiency, energy saving, long life and environmental protection, and are gradually being applied to lighting. A key factor driving attention to LED lighting technology is that it greatly reduces energy consumption and enables long-term, reliable work.
This article starts with a circuit using a constant current source . The main component transistor in this circuit requires a high-power tube with a withstand voltage of 400V or more and a power of 10W or more, such as MJE13003, MJE13005, etc., and a heat sink is required. The filter capacitor C has a capacity of 4.7uF and a withstand voltage of 400V or more. The current of the arc tube is determined by the R2 adjustment. For the convenience of adjustment, the variable resistor can be adjusted and then replaced with a fixed resistor of the same resistance. This circuit can be equipped with an arc tube. The number is less than a dozen, and the maximum can reach more than 90. Although the cost is increased, the effect is much better than that of the resistor-only current circuit. Even if the voltage fluctuates greatly, the circuit can keep the current constant. This is very advantageous for the life of the arc tube, and the current in this range can be kept substantially constant. The number of light-emitting tubes used in this circuit is not too small, and the less the efficiency, the lower the efficiency. The total power consumption of this circuit is about 6W.
Here, I will tell you about the LED adoption and connection method or the serial connection method?
LEDs are connected in series or in series , and should be determined mainly according to the form and requirements of the power box circuit.
With a series connection circuit, when one of the LEDs is open, the entire string of LEDs is not bright; but when one of the LEDs is shorted, the other LEDs are still bright. With the circuit of the parallel connection method, when one of the LEDs is open, the other LEDs can be bright; but when one of the LEDs is short-circuited, the power of the entire circuit will be short-circuited, so that not only other LEDs can not work normally, and It is also possible to damage the power supply. Therefore, the circuit connected in series is more advantageous.
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