Temperature sensor NTC LED lighting overheating protection is relatively early widely used. LED lamps, such as the use of high-power LED light source, you must use a multi-wing aluminum radiator, LED flood light for interior lighting itself is very small space, the heat problem is still one of the largest technical bottlenecks. LED flood lightheat unhappy words, will lead to LED light source due to overheating and early light failure.
After the LED lamp is turned on, the heat will also be enriched to the lamp cap due to the automatic rise of the hot air, which will affect the life of the power supply (Figure 9).
Therefore, in the design of LED lamps can be close to the aluminum radiator near the LED light source in close contact with an NTC, in order to collect the temperature of the lamp in real time, when the LED flood light aluminum heatsink temperature can be used to automatically reduce the output current of the constant current source, When the temperature of the lamp cup aluminum radiator rises to the limit set value, the LED power supply will be cut off automatically to realize the over-temperature protection of the lamp. When the temperature drops, the lamp will turn on automatically.