In recent years, lamps made with 1 to 3W high-power LEDs have increased year by year, and their power can range from a few watts to hundreds of watts. High-power LED lamps adopt the structure of LED series connection, and are powered by constant current. The structure is shown in Figure 1. Generally, the operating current of 1W LED is 250-350 mA, the working current of 3W LED is 600-700 mA, and the current is 900-1000 mA.
Figure 1 LED drive circuit
Such a series LED lamp has a disadvantage that if one of the LEDs in series is open, the entire lamp is not illuminated. This is very dangerous for the application of certain lamps (such as warning lights, miner's lamps, emergency lights, etc.). In order to prevent the LED light from being bright when the LED is open, it is very effective to use the LED open circuit protector, which can ensure the safety of the lamp.
The 1W LED open circuit protector that has been developed has two structures: Zener diode type and thyristor type (one-way thyristor type), as shown in Fig. 2. Some LED manufacturers directly package Zener diodes with LEDs, that is, LEDs with open circuit protection are also available. The working current of 3WLED is generally 700~1000mA. This open circuit protector is rare in the market due to the large current.
Figure 2 two LED protection devices
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