LED Lamp Bead Connection Form, Common Failure Solution of LED Light Emitting Modules

LED lamp beads Common forms of connection 1. Overall connection form (1) Simple series forms Generally and simple series connection forms of LED1 LEDN are connected at the beginning and tail, and the current flowing during LED is equal. For LEDs of the same-specifications and batches, although the voltage on a single LED may have a small difference, because the LED is a current device, it can ensure that their luminous intensity is consistent, trapped this, simple series forms of formation forms LED has the characteristics of simple circuit and convenient connection. However, due to the use of series, when one of the LEDs occurs, 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 Qiner 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, the current is mainly flowing through the LED1 LEDN. When the damaged LED in the LED string is caused In addition to the fault LED, other LEDs still have currents through the current and glow. This connection method is greatly improved in terms of reliability comparison in terms of reliability. Overall parallel form (1) Simple parallel form Simple and connected LED1 LEDN head and tail parallel, each LED is equal to each LED. 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, the difference in performance is inherent, so when LED1 LEDN works, whoever spends 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. 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 parallel form of independent matching is a good way. Each LED in this way has currently adjustable current (the drive Voutput terminal is L1 Ln, respectively), and ensure that the current flowing through each LED is within the range of its requirements, with good driving effects, a single LED, a single LED Protect complete, does not affect other LED work when faults, and can match the characteristics of LEDs with large differences. The main problem of existence is: the composition of the entire driver circuit is relatively complicated, the cost of the device is high, and the volume of occupation is too much. It is not suitable for the large number of LED circuits. Mixed -connected forms are 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, the number of LED applications is large, and the simple series or parallel connection is unrealistic. The former requires the former to request a high voltage of the drive (N times of a single LED voltage VF). To fall the drive with 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 working voltage of the number of LEDs in series and the working voltage of a single LED VF determines the output voltage of the driving force; The NVF value determines the output power of the drive. 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. The entire circuit has the characteristics of relatively simple structure, convenient connection, and high efficiency. It is suitable for applications with a large number of LEDs. (2) Several LEDs that are mixed with a string of collaboration first and then skewers are first and then stringed. 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 and existing problems of this mixed form form are similar to. (3) 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. 2. Different connections in different connections have their own characteristics, and the requirements for the driver are different, especially when a single LED fails to fail the circuit work, the overall lighting reliability, and ensure that the overall LED can be as much as possible to be as possible as possible. It is particularly important to continue the ability of work and reduce the overall LED's 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. LED luminous module failure and solution phenomenon: all LED flashing; Question: poor contact; solution: re -fixation or insertion; phenomenon: LED dim; Question: 1. LED polarity is reversed; 2. LED is too long to be too long ; 3. The switching power supply is inconsistent with the LED voltage mark; Light; Question: 1. Whether the direction of the insertion is correct; 2. Whether the power output wiring is correct; 3. The power cord plugs and reverse; the solution: 1. Disassemble , Black wires are connected to negative poles; 3. Find out part of the inverse lines; re -connect; phenomenon: All LEDs are not bright; Question: 1. There is no voltage output of the switching power supply; 2. Whether the output wiring of the switching power supply is correct; solution: 1 , Test -to -power access switching power input terminal; 2. Power wiring positive and negative poles correct;