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4 Connection Methods for LED Driver

  • Categories:Industry News
  • Author:Ways Yi
  • Origin:
  • Time of issue:2022-08-24 09:42
  • Views:

(Summary description)At present, many LED products like led high bay, street light use constant current drive mode to drive LEDs, and LED connection mode is also designed according to actual circuit needs. There are generally four forms like series, parallel, mixed and array.

4 Connection Methods for LED Driver

(Summary description)At present, many LED products like led high bay, street light use constant current drive mode to drive LEDs, and LED connection mode is also designed according to actual circuit needs. There are generally four forms like series, parallel, mixed and array.

  • Categories:Industry News
  • Author:Ways Yi
  • Origin:
  • Time of issue:2022-08-24 09:42
  • Views:
Information

At present, many LED products like led high bay, street light use constant current drive mode to drive LEDs, and LED connection mode is also designed according to actual circuit needs. There are generally four forms like series, parallel, mixed and array.

 

1. Concatenation method

 

The circuit of this series connection method is relatively simple, the end and end are connected together, and the current flowing through the LED is very consistent. Since the LED is a current-type device, the luminous intensity of each LED can basically be guaranteed to be consistent. The circuit adopting this LED connection method is simple and convenient to connect. But there is also a fatal disadvantage, that is, when one of the LEDs has an open-circuit fault, the entire LED light string will be extinguished, which will affect the reliability of use. This requires ensuring that the quality of each LED is excellent, so the reliability is correspondingly increased.

 

It is worth noting that if the LED constant voltage drive power supply is used to drive the LED, then when a certain LED is short-circuited, the circuit current will increase, and when it reaches a certain value, the LED will be damaged, resulting in all subsequent LEDs being damaged, but if the LED constant current drive power supply is used to drive the LED, when a certain LED is short-circuited, the current basically remains unchanged, which has no effect on the subsequent LEDs. No matter which way it is driven, once an LED is opened, the entire circuit will not be lit.

2. Parallel connection

 

The parallel mode is characterized in that the LEDs are connected in parallel at the head and tail, and the voltages on each LED are equal during operation. However, the currents are not necessarily equal, even for LEDs of the same model and batch of specifications. This is due to the manufacturing process and other reasons. Therefore, the inability of the current distribution of each LED can make the life of the LED with excessive current decrease compared with other LEDs, and it is easy to burn out over time. This parallel connection circuit is relatively simple, but the reliability is not high, especially in the case of a large number of LEDs, the possibility of failure is higher.

 

It is worth noting that the voltage required for parallel connection is lower, but because the forward voltage drop of each LED is different, the brightness of each LED is different, and if one LED is short-circuited, the entire circuit will be short-circuited. The rest of the LEDs can't work normally. If a certain LED is disconnected, if the constant current drive is used, the current distributed to the remaining LEDs will increase, which may cause damage to the remaining LEDs, but the use of constant voltage drive will not affect the entire LED circuit. of normal work.

 

3. Mixed connection method

 

Hybrid connection is to use a combination of series and parallel methods. First, several LEDs are connected in series, and then connected in parallel to both ends of the LED drive power supply. Under the condition of basic consistency of LEDs, this connection method makes the voltages of all branches basically equal. , the current flowing through each branch is basically the same.

 

It is worth noting that the hybrid connection method is mainly used in the case of a large number of LEDs, because this method ensures that the LED failure in each branch will only affect the normal lighting of this branch at most, which improves reliability compared with the simple series and parallel forms. sex. At present, many high-power LED lamps generally use this method to achieve a very practical effect.

 

4. Array method

 

The main form of the array mode is: the branch is composed of 3 LEDs, which are respectively connected to the Ua, Ub and Uc output terminals of the driver output. When the three LEDs in a branch are all normal, the three LEDs light up at the same time; once one or two of the LEDs fail to open, it can ensure that at least one LED works normally. In this way, the lighting reliability of each group of LEDs can be greatly improved, and the overall reliability of the entire LED lighting can also be improved. In this way, multiple sets of input power supplies are required, and the purpose is to improve the reliability of the LED operation and reduce the overall circuit failure rate. Thus, it’s important to be equipped with a suitable driver for led high bay, flood light and led area light etc.

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