Lighting delay light-off circuit using thermistor
Source: InternetPublisher:奥特man123 Keywords: Thermistor delayed lights off Updated: 2021/04/08
The circuit is shown in Figure 2-49. The circuit is very simple. It uses the jump characteristics of the cold and hot resistors of the thermistor
PTC element
to control the delay time of the lamp. The general delay time is
10~30s. If you want to change the delay time, you can adjust
the values of Rz and C.
R． A PTC thermistor with a positive temperature coefficient is used
. The Curie point is selected to be around 80°C. Its nominal resistance
is ≤1500 at 20°C and rises to several thousand ohms
to tens of kiloohms at 80°C. Rt and R2 need to be in close contact.
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