Guide: led bulbs are an indispensable device in our lives. It not only beautifies our lighting environment, but also creates a different home improvement atmosphere. Many people will ask if the LED bulbs are connected in series or in parallel. I believe many people don't know much about it! Why are LED bulbs not bad? We all know that LED bulbs are very durable, environmentally friendly and energy-saving, and are contemporary civilization. The main symbol, then about whether the LED bulbs are connected in series or in parallel, let's take a closer look.
LED bulb
LED bulbs are connected in series or in parallel
LED bulbs are connected in series or in parallel - advantages and disadvantages of LED series and parallel
LCD backlights, general lighting fixtures, street lamps, etc. need to drive multiple high-brightness LEDs simultaneously. These LEDs require a series-parallel combination connection and require drive.
For example, when driving a 28-inch LED, there are six connection methods that can be conceived. One is to first connect 14 LEDs (LED strings) and then connect two LED strings in series (14 series × 2 parallel). In addition to this, there are 7 series × 4 parallel, 4 series × 7 parallel, 2 series × 14 parallel, 28 series × 1 parallel, 1 series × 28 parallel connection.
Is the LED light connected in series or in parallel? Answering this question requires an understanding of the advantages and disadvantages of LED series and parallel connection.
Whether the LED bulbs are connected in series or in parallel - the advantage of series connection is that the brightness is uniform
The advantage of series is that the brightness of the same string of LEDs is uniform. Because the current supplied to all LEDs is the same. Moreover, the driving IC can output all the LEDs in series by outputting only one current, and the circuit has a simple structure. In addition, even if a short-circuit fault occurs in one LED short-circuit, the other LEDs can continue to illuminate.
The disadvantage is that the drive voltage is higher. When 14 LEDs are connected in series, assuming a forward voltage drop (VF) of 1 LED is 4V, the driving voltage needs 56V. If 28 are connected in series, it is as high as 112V. In addition to products from some semiconductor manufacturers, the range of high drive voltage LED driver ICs is extremely narrow.
In addition, there is a disadvantage that the LEDs in series cannot be lit after an LED is broken.
LED bulbs are good in series or in parallel, and there are two advantages in parallel. One is the ability to drive multiple LEDs simultaneously at low voltage. If it is a 2 series × 14 parallel configuration, then 8V drive voltage can drive 28 LEDs. Another advantage is that when a series LED fails for some reason, other series connected LEDs can continue to illuminate. In other words, it is possible to form a circuit that is not susceptible to failure.
LED bulb
LED bulbs are good in series or in parallel, and there are two disadvantages. One is that the supply currents of multiple LED strings connected in parallel are difficult to control to the same value, so the brightness of each string of LEDs is likely to vary. The other is that the drive circuit is more complicated. If the number of parallels is 14, you need to route 14 LED strings. Moreover, according to the circuit structure, all LED strings must be separately subjected to voltage control and current control, resulting in an increase in cost.
Why are LED bulbs not bad?
Why is the LED bulb not bad? It changes the principle of incandescent tungsten filament illumination and energy-saving lamp tri-color toner illumination, and uses electric field illumination. Why LED bulbs are not bad. According to analysis, the characteristics of LEDs are very obvious, long life, high luminous efficiency, no radiation and low power consumption. The spectrum of the LED is almost entirely concentrated in the visible light range, and its luminous efficiency can exceed 150 lm/W (2010). Comparing LED with ordinary incandescent lamp, spiral energy-saving lamp and T5 trichromatic fluorescent lamp, the results show that the luminous efficiency of ordinary incandescent lamp is 12lm/W, the life is less than 2000 hours, the luminous efficiency of spiral energy-saving lamp is 60lm/W, and the service life is less than 8000 hours, T5 fluorescent lamp is 96lm / W, life expectancy is about 10,000 hours, and the white light LED diameter of 5 mm can theoretically exceed 150lm / W, the life can be more than 100000 hours. Some people also predict that the future LED life limit will be infinite. However, the working principle of LED lights makes the heat dissipation problem in the high-power LED lighting industry become very prominent. Many LED lighting solutions do not pay much attention to heat dissipation, or the technical level is limited. Therefore, the current high-power LED lamps in mass production generally have actual service life. Far less than the theoretical value, the cost performance is lower than the embarrassing situation of traditional lamps. In order to improve the service life of LED lamps, and truly suitable for commercial mass production, LED lighting industry is working independently or with professional thermal material suppliers to develop new thermal materials, such as thermal plastics.
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