Light-emitting diode (LED) lamp control circuit having key element overvoltage protection function
A technology of LED lamps and overvoltage protection, which is applied in the direction of emergency protection circuit device for limiting overcurrent/overvoltage, emergency protection circuit device, lamp circuit layout, etc., and can solve the problem of LED lamp dead light scrapping and switching surge impact , fan damage and other problems, to avoid excessive instantaneous voltage, reliable control, and reduce the effect of circuit components
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Embodiment 1
[0025] like figure 1 , figure 2As shown, the LED lamp with overvoltage protection function of key components in this embodiment includes a radiator for passive heat dissipation, and the LED lamp control circuit with overvoltage protection function of key components includes a first temperature control switch circuit 1, an overcurrent Protection circuit 11, power lightning protection circuit 2, EMC circuit 3, voltage stabilizer and PFC circuit 5, LED light source load 6, rectifier circuit 4 that converts alternating current into direct current, and stabilizes voltage and current for the LED light source load 6 Constant current circuit 7, the overcurrent protection circuit 11 is connected to the input end of the power supply, the overcurrent protection circuit 11 includes an overcurrent protection fuse F1 for overcurrent and short circuit protection, the power lightning protection circuit 2 is connected to the overcurrent protection circuit 11 and the first temperature control...
Embodiment 2
[0027] like image 3 , Figure 4 As shown, the LED lamp control circuit with the overvoltage protection function of key components in this embodiment can be applied to the high bay lamp of the cold storage. The LED lamp includes a cooling fan for active heat dissipation and a radiator for passive heat dissipation, which is related to the The difference between the first embodiment is that this embodiment also includes a lamp fan motor 10 , a fan shunt circuit 8 , and a second temperature control switch circuit 9 , and the second temperature control switch circuit 9 is connected in series with the lamp fan motor 10 . In parallel with the fan shunt circuit 8, the fan shunt circuit 8 is connected in parallel with a second Zener diode Dfan, and the voltage regulator operating point of the second Zener diode Dfan can be based on the power of the lamp and the actual circuit situation. and other factors are selected as a specific voltage between 6 and 24V DC, and the fan shunt circu...
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