Voltage design of led fluorescent lamp panel
The voltage design of the LED fluorescent lamp panel depends on the voltage of the LED lamp beads. The more lamp strings, the higher the voltage. Usually,
1. Non-isolated power supply, using high string lamp beads, generally more than 20 strings, which is convenient to reduce the current. Non-isolated power generally has high voltage and low total current
2. The current of the isolated power supply is relatively large, and the LED lamp string can be made smaller, generally 10-12 strings. The isolated power supply generally has low voltage and large current.
It mainly depends on the choice of power supply, and then comes to match the led light board
One of the designs:
When designing the LED fluorescent lamp module, the constant current driver module needs to be taken into consideration. For example, the number of LED fluorescent lamps connected in series should be guaranteed to be less than ten, because LED lamps have a safety upper limit.
According to the European standard, the maximum voltage of the LED module driven by the power supply cannot exceed the maximum safe voltage of industrial electricity.
So if one led fluorescent lamp is 22v, ten are 220v.
Secondly, as an LED fluorescent lamp, in order to facilitate maintenance, it is often in the form of modules, and it is recommended that the power of each module is less than 32 volts.
Third, it is recommended to use 0.1-0.2w led diodes for each led module, and use parallel and parallel hybrid methods. This avoids all being unable to emit light when one of them is damaged.
The second design plan:
Using low-power led lamp beads. Such as 3014, 3528, 2835, 5730, etc., the isolated power supply adopts 12 strings, the voltage reaches about 38v, and the led fluorescent lamp ensures safety
Design scheme three:
If it is found that the LED light board is not enough, for example, there are only 12 series and 4 parallels, and 12 series and 5 parallels are actually needed. In this case, we can increase the power of the LED lamp beads. For example, if we usually use 2835 0.2w, each parallel can be shared Less than 60ma. After the number of parallels is reduced. We increase the power. With 0.5w, the current can reach 75ma. Although the power is a bit larger, the led lamp beads are protected. The use range of the led lamp board is wider. The board reduces the cost and meets the conditions of use.
The main convenience is due to the benefits brought by the increased power of led lamp beads. If 3528 0.06w 3014 0.1w is used in the early stage, there is no workaround, only to increase led lamp beads, and the process becomes more troublesome
Design scheme four
There are skills in the design of high-efficiency LED light boards. Generally, it is better to use high-string light boards. At the same time, pay attention to the number of parallel connections that need to be considered more, which indirectly increases the current. At the same time, pay attention to try to use LED light beads with low voltage, so that It can also improve the light efficiency of a single LED lamp bead.
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