LED cycle lighting circuit based on 12C508A control

Posted by: admin  • Information section:LED

The circuit is a LED color-changing lighting control circuit suitable for landscape lighting such as urban streets, parks and factory lighting projects. The circuit structure is simple, the life is long, the light color is bright, soft and beautiful.

  The working principle is as follows: the circuit is energized, after the AC 220V is rectified, one pass through the resistor R1, the step-down C1 is filtered into a +5V voltage to supply the integrated block U1 (12C508A); the other is directly supplied to the positive electrode of the light-emitting diode (red, green, blue). . When the 12C508A is powered, it outputs a 0~0.76V pulse signal from the 5th, 6th, and 7th pins in turn, triggering the corresponding Thyristor to conduct, thereby causing the connected LED string to emit light. U1's 4 pin is connected to resistor R4 and capacitor C3 for time constant control (change the corresponding resistance and capacitance capacity specifications, you can change the duration of each string of LEDs); R2 and R3 are used to start 12C508A when power is on. . The lamp has a normal cycle of about 2 minutes.

  The whole string consists of 12 strips with a width of 15mm and a length of 465mm. It consists of 528 LEDs, and the red, green and blue LEDs are arranged at intervals. Among them, the red LED is 80 strings. There are 20 series of 1.2kΩ/1W current limiting resistors (current is 13.7mA). Green and blue are each 48 LEDs. Each is 12 strings and 1 1 Ω/1 W resistor (current is 15 mA). The mixed cross arrangement 44 is a set of boards.

  Common faults: not lit after power on. The fault is generally R2, R3, R1 open circuit or 12C508A damage. If there is a set of color long lights, it is the group of controlled thyristor (MCR100-6) breakdown. Another common phenomenon is that if there is an aging or burnout in the LED series circuit, then the group will have no current to pass through. At this time, you need to use a set of 3.0V power supply, string a 20Ω. After the resistor. The set of diodes are searched one by one from start to finish. Just replace the non-bright LED.

  When repairing, be sure to disconnect the power supply, solder or find faults. be careful. The Circuit diagram drawn in kind is shown in the drawing.

  



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read ()  •  Sep 23, 2019  •  Edit


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