I need to control temperature of a heater. The heater uses 12 to 24V DC. I like to control the temperature by regulating the current (>20A) or voltage (from 12 to 24V) to the heater instead of using a SSR. I used PWM to control an SSR, then the voltage or duty cycle supplied to the heater. It se…

[image] supermulan88: by regulating the current (>20A) That’s a lot of current. How tight a temperate window is needed ? Perhaps just on/off control is needed ? Does the voltage need to change 12v/24v ? A MOSFET or two might be a solution for this. Suggest solid 24v and a MOSFET.

hi @supermulan88 What voltage and type of power is available to supply to this heater? AC DC? Please post more details of your project. With little information about your project, it is difficult to give good help. [image] supermulan88: but I have read comments that this would use out the l…

the link to the comments: Can you PWM a relay? - Using Arduino / General Electronics - Arduino Forum The power to the heater is max 24V but I want to vary the power, either the current or the voltage, to the heater so to control the temperature when it stabilized. I want directly vary the power t…

If you don’t need tight PID control, try 24v DC, logic MOSFET and a temperature sensor. A fan can be helpful. Use C1 with motor3 and D3 replaced by your heater; change power supply from 12 to 24v. [DiscreteMotorControl] 7253db9f14a32e3568824488ca7d3ba8cae7aea6.pdf 1351.52 KB …

Hi, @supermulan88 Welcome to the forum. Please read the post at the start of any forum , entitled "How to use this Forum". [image] How to get the best out of this forum IDE 1.x See also FAQ - Arduino Forum for general rules on forum behaviour and etiquette. Hello, Welc…

I see no benefit in using PWM on a 500W heater (24V * 20A) as it will have a large heat capacity, so if air cooled its temperature will change little in a short space of time. @drmpf I'm interested - thats a nice piece of engineering, why was it an advantage to use PWM in that particular case?? I'…

[image] johnerrington: why was it an advantage to use PWM in that particular case?? The temperature of the head is actually being controlled by a thermocouple to melt down into a block of ice, so PWM provides the variable power to control the temperature of the head. You are correct about a …

Current or voltage control by PWM?

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drmpf July 14, 2021, 1:59am 9

Here is 24V heater control I just built for a 30A heater controlled by PWM from a 3v3 board

High Current fan controlled with Arduino pwm

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Current or voltage control by PWM?

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