How to connect in-line LED lamp beads
1. Overall series connection
1. Simple series connection
Generally, in the simple series connection form, LED1~LEDn are connected end to end, and the currents flowing through the LEDs are equal when they work. For LEDs of the same specification and batch, although there may be slight differences in the voltage on a single LED, since the LEDs are current-type devices, they can ensure the same luminous intensity. LED has the characteristics of simple circuit and convenient connection. However, due to the series connection, when one of the LEDs has an open-circuit fault, the entire LED light string will be extinguished, affecting the reliability of use.
2. Series form with parallel Zener diodes
Each in-line LED lamp bead is connected in parallel with an improved series connection of a Zener diode. In this connection, the breakdown voltage of each Zener diode is higher than the operating voltage of the LED. When the LED is working normally, since the Zener diodes VD1~VDn are non-conductive, the current mainly flows through LED1~LEDn. Except for the faulty LED, the other LEDs still have current flowing through and emit light. Compared with the simple series connection, this connection method is greatly improved in reliability.
Second, the overall parallel form
1. In-line LED lamp beads in simple parallel connection
In the simple parallel form, LED1~LEDn are connected in parallel end to end, and each LED bears the same voltage during operation. It can be seen from the characteristics of the LED that it is a current-type device, and a small change in the voltage applied to the LED will cause a large change in the current. In addition, due to the limitation of LED manufacturing technology, even the same batch of LEDs, the difference in performance is inherent, so when LED1~LEDn work, who passes the current of each LED is not equal. It can be seen that the impossibility of the current distribution of each LED can drastically reduce the life of LEDs with excessive current, or even burn them out. This connection method is relatively simple. However, the reliability is not high, especially for applications with a large number of LEDs, it is more likely to cause failures in use.
2. In-line LED lamp beads are independently matched in parallel form
For the reliability problems existing in simple parallel connection, the parallel form of independent matching is a good way. Each LED in this method has its own current adjustability (the V+ output terminals of the driver are L1~Ln, respectively), which ensures that the current flowing through each LED is within its required range, and has good driving effect and a single LED. The protection is complete, the failure does not affect the work of other LEDs, and the LEDs with large differences can be matched. The main problems are: the structure of the entire driving circuit is relatively complex, the cost of the device is high, and the volume occupied is too large, which is not suitable for a large number of LED circuits.
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