hi ,everyone, I am dealing with a temperature control job. And the object is 200K with a 0.05C stability.
Demand on TEC control is like following :
The maximum current supply of the TEC shall be less than 4.2 A for 7.4 V such that the maximum electrical power is less than 31 W.
At first I prefer a PWM control based on a H-bridge, but there are some app tips from Marlow and RMT which stated a DC current is more efficient than PWM. I wander if this is true.
Id like to use a H-bridge shown below, and the LC filter to smooth the current , but I dont know how to limit both the voltage and current within the requirment mentioned before in the same time , thanks alot for any suggestion.
I had known the high-side driver issue, and I will employ an IC to simply my design , but during one period, how the voltage changed on the TEC1 and TEC2 . I want to figure out how to operate the MOSFETs using PWM. For example, turn off Q1 and Q3, turn on Q2 , and a PWM on Q4 to result a current from TEC2 to TEC1, is that right?
An last, any programmable DC current supply scheme is appreicated.
Demand on TEC control is like following :
The maximum current supply of the TEC shall be less than 4.2 A for 7.4 V such that the maximum electrical power is less than 31 W.
At first I prefer a PWM control based on a H-bridge, but there are some app tips from Marlow and RMT which stated a DC current is more efficient than PWM. I wander if this is true.
Id like to use a H-bridge shown below, and the LC filter to smooth the current , but I dont know how to limit both the voltage and current within the requirment mentioned before in the same time , thanks alot for any suggestion.
I had known the high-side driver issue, and I will employ an IC to simply my design , but during one period, how the voltage changed on the TEC1 and TEC2 . I want to figure out how to operate the MOSFETs using PWM. For example, turn off Q1 and Q3, turn on Q2 , and a PWM on Q4 to result a current from TEC2 to TEC1, is that right?
An last, any programmable DC current supply scheme is appreicated.
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