Hi, I have a one project called thermistor heater and the maximum rating of this thermistor heater is 12V , 3A so in this project I have to cut the power after certain temperature using microcontroller PWM signal using TIP3055 power transistor so please give me an idea how the circuit can be designed in order to complete this task also if anyone have other idea to this task please let me know that also thank you.

 

Hi, I have a one project called thermistor heater and the maximum rating of this thermistor heater is 12V , 3A so in this project I have to cut the power after certain temperature using microcontroller PWM signal using TIP3055 power transistor so please give me an idea how the circuit can be designed in order to complete this task also if anyone have other idea to this task please let me know that also thank you.

A schematic diagram of the existing system would be most helpful in order to conceive of a potential solution.

 

Hi Md.
Welcome to AAC.
Do you plan to use the thermistor to measure the temperature and a circuit to switch the 12V to heater On/Off at specific temperature.?
E

 

in this project I have to cut the power after certain temperature using microcontroller PWM signal using TIP3055 power transistor

If you choose a logical level N-MOSFET(Ids>15A) is better than TIP3055.

 

Hi Md.
Welcome to AAC.
Do you plan to use the thermistor to measure the temperature and a circuit to switch the 12V to heater On/Off at specific temperature.?
E

Yes

 

If you choose a logical level N-MOSFET(Ids>15A) is better than TIP3055.

OK

 

hi Md,
What is the type of thermistor you plan to use.
Temperature at which the circuit will switch Off the 12V, required accuracy>?


E
Edit: why do you want to use a micro controller.?

 

OK

You can choose your own or check some info below:
N and P-type MOSFET Components Simple Data.

 

It sounds like you just want a thermostat, but you also mention PWM. So which is it.?

If you simply want yo turn the heater on below a specific temperature, there is no PWM involved.

If you intend to use PWM to maintain a constant temperature, that is much more complicated, and would involve a PID controller.

Also, is it a fixed temperature, or variable?

 

hi Md,
What is the type of thermistor you plan to use.
Temperature at which the circuit will switch Off the 12V, required accuracy>?


E
Edit: why do you want to use a micro controller.?

So basically I want to control the thermistor heater using microcontroller so for that I need transistor to cut the power supply after a certain temperature and the would be anything when thermistor will be too hot

 

It sounds like you just want a thermostat, but you also mention PWM. So which is it.?

If you simply want yo turn the heater on below a specific temperature, there is no PWM involved.

If you intend to use PWM to maintain a constant temperature, that is much more complicated, and would involve a PID controller.

Also, is it a fixed temperature, or variable?

No I want to cut the power supply after certain temperature when thermistor will be too hot so for that I will need to use transistor to cut the power supply thank you

 

No I want to cut the power supply after certain temperature when thermistor will be too hot so for that I will need to use transistor to cut the power supply thank you

That is a thermostat. You can buy one already built. If it is a fixed temperature, then there is a simple, single component.

 

hi Md.
Are you trying to control the actual temperature of the Thermistor.??

E

 

Here we are 13 posts into this thread and still no schematic diagram. Would it be impertinent of me to ask the TS why they are being so obstinate?

 

Y

Hi Md.
Welcome to AAC.
Do you plan to use the thermistor to measure the temperature and a circuit to switch the 12V to heater On/Off at specific temperature.?
E

Yes

 

Hi @Md_Yusuf

If you do not post a circuit diagram, there is no purpose in keeping this Thread Open.

Please post a diagram.

Moderation.