LED Lamp Beads Commonly Used Connection Methods

The configuration form of LED in the application depends on many factors, including LED parameters and quantity, input voltage, efficiency, heat dissipation management, size and layout restrictions and optics, etc. The simplest configuration form is a single LED. Because planes are usually required for actual application occasions, multiple LEDs need to be arranged and combined as needed to meet the application requirements of large -scale, higher brightness, dynamic display, color transformation, and the matching requirements of LED and supporting drivers. I. Overall connection form 1. Simple series forms are generally connected in LED1 LEDN in the form of simple series connection forms, and the current flowing during LED is equal. For LEDs with the same specifications and batches, although the voltage on a single LED may have a small difference, because the LED is an current device, it can ensure that their luminous intensity is consistent. Therefore, the simple series of LEDs have the characteristics of simple circuits and convenient connections and other characteristics. (Disadvantages: Due to the use of series, when one of the LED fails, the entire LED lights will be extinguished, which will affect the reliability of use. ) 2. The series forms of the two -pole diode with the combination of Qina diode are connected to an improved series connection form of a Qina diode in parallel. In this connection method, the breakdown voltage of each Zina diode is higher than the working voltage of the LED. When working normally, because the Qina diode VD1 VDN does not drive, the current mainly flows through the LED1 LEDN. When the damaged LED in the LED string is caused In addition to the LED, other LEDs still have currents passing and glowing. WeChat public account: Shenzhen LED Chamber of Commerce (this connection method and simple series form have greatly improved reliability in terms of reliability. ) Second, overall parallel form 1. Simple parallel form, simple and connected LED1 LEDN head tail parallel, each LED is equal to the same voltage, equal voltage. It can be seen from the characteristics of LED. It belongs to a current device, and the slight changes in the voltage added to the LED will cause a large change in the current. In addition, due to the limitations of LED manufacturing technology, even the same batch of LEDs, there are differences in performance. Therefore, when LED1 LEDN works, the current flowing through each LED is not equal. It can be seen that the uneven distribution of each LED current may cause the LED life of the current to be too large, and even burn out. (Disadvantages: Although this connection method is relatively simple, but the reliability is not high, especially for applications in the case of large number of LEDs. ) 2. The parallel form of independent matching is aimed at the reliability of simple parallelism. The independent matching parallel form is a good way. Each LED in this way has a current adjustable (drive Voutput terminal is L1 Ln) to ensure that the current flowing through each LED is within the range of its requirements, with good driving effects, a single LED protection Complete, do not affect other LED work when faults, and can match the characteristics of LEDs with large differences. (Disadvantages: The composition of the entire driver circuit is relatively complicated, the cost of the device is high, the volume occupies too much, it is not suitable for the large number of LED circuits. ) Third, the mixed form of mixed formation is proposed by integrating the respective advantages of series and parallel forms. The main forms are the following two. 1. When the mixed formation forms are first, when the number of LED applications is large, simple series or parallel connection is unrealistic, because the former requires the driver to output a high voltage (N times of a single LED voltage VF), and the latter requires the driver to require the driver Output a large current (N times of a single LED current if). This brings difficulties to the design and manufacturing of the driver, and also involves the structural problems and overall efficiency of the drive circuit. The voltage of the number of LEDs in series and the working voltage of a single LED VF determines the output voltage of the driving device; The value determines the output power of the driver. Therefore, the mixing method after mixing is mainly to ensure that there is a certain reliability (the LED fault in each string only affects the normal light of the string), and the matching of the drive circuit ), It improves reliability than simple series forms. WeChat public account: Shenzhen LED Chamber of Commerce (the entire circuit has the characteristics of relatively simple structure, convenient connection, high efficiency, etc., suitable for applications with a large number of LEDs. ) 2. Several of LEDs that are mixed with a string first, and the mixed forms of mixed connecting before the string. Since LED1-N LEDM-N is first connected to connect, which improves the reliability of each group of LEDs, but this is important. For this reason, you can choose the working voltage and current as much as possible as a parallel group by pairing, or to solve the small current resistance of each LED. (The other characteristics of this mixed formation form and the existing problems are similar. ) Fourth, cross array forms of cross arrays are mainly to improve the reliability of LED work and reduce the failure rate. The main form of composition is: each series of 3 LEDs as a group, and the VA, VB, and VC output terminals that are connected to the drive output of the drive. When the 3 LEDs of a series are normal, the 3 LEDs are glowing at the same time; once one or two LEDs are invalidated, it can ensure that at least one LED work normally. In this way, it can greatly improve the reliability of each group of LD light, and it can improve the overall reliability of the entire LED glow. Summary: Different connection forms have their own different characteristics, and the requirements for the driver are different, especially when a single LED fails to fail the circuit work, the overall lighting reliability, the ability to ensure the overall LED as much as possible, the ability to continue to work as much as possible, the ability to continue to work, It is particularly important to reduce the overall LED failure efficiency, etc. All in all, LED group applications are an important way for LED actual applications. Different LED connections are essential for large -scale LEDs and design requirements for driving circuits. Therefore, in the combination of actual circuits, the correct selection of the compatible LED connection method is of positive significance for improving the effect of its luminous effect, the reliability of the work, the convenience of the driver design and manufacturing, and the efficiency of the entire circuit.