Possible related post:Warming PCB in a low temperature environment
I am trying to design a circuit which should work properly under -55 degree. There are two options in front of me: to choose specific components and carefully design the circuits to fulfill the environment requirements, or to heat the circuit up.
After searching the internet for a while, I decide to choose the second one, due to the complexity of our circuit. It would be easier just to heat the system up.
Here comes some of my initial thoughts, which are contributed by the mentioned post.
- The circuit shall be divided into two parts: heating part and the functional part. The heating part is to create a suitable environment for the functional part. The functional part can only work properly, say, above +10 degree.
- The functional part shall not work when the temperature is below +10 degree. It shall wait until the heater heat up the environment.
- An analog temperature sensor like this one will be used to measure the environment. It will control a 1*2 switch: one end system power, the other end heat up circuit OR the functional circuit.
- Could I get some comments? Or any better designs?
- How should I calculate the number of heat-up resistors?
- How to calculate the heat-up power needed?
- Some sort of heat-isolation material shall be used. How to find them?