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Peltier power circuit with PWM

DJ15246
Prodigy 130 points
Other Parts Discussed in Thread: LM5023, UCC28630

HI All

I need to develop a power supply for a thermal application. We are using a thermal peltier module. We are going to use the one that is rated to about 70W. I would like to use a PWM with a Switch mode power supply, so that I can regulate the power going to the module and adjust it depending on the required temperature and which would optimise the power consumption for when I do not need low temperatures. Can you please advise me on what devices to use and if I am correct I need to use some form of filter on the output of the power regulator before connect the Peltier?

Thank You

Regards


DJ

  • 0
    TI__Mastermind 31580 points
    Hi DJ,

    All of the power supply designs will come with some form of filtering to reduce the output voltage ripple. What you need to do is put together a spec for the power supply that you require.

    Input Voltage range ?, AC or DC ?
    Output voltage ?
    single output or multi-outputs
    Isolated or non-isolated
    Output voltage ripple ?
    Constant Voltage or constant current ?

    For example take a look at the LM5023 and UCC28630 product pages and EVMs. Read through the EVM user manuals to see how the power supply is specified and if it is close to your requirement.

    Regards

    Peter
  • 0 in reply to Peter Meaney
    Prodigy 130 points

    The input power will be DC, ideally input voltage range between 5 to 30V. 

    Outputs

    Output 1

    I require a max output of 12V 5A. AS i require it to be PWM output would be between 5 to 12V. This would be for my peltier .

    Output 2

    12 V 400 mA  for Fans. I will have two fans, it would be good if these two fans can also be speed controlled. Maybe with special FAN IC or just a Mosfet / Micro controller. 

    Output 3

    3.3V for the micro controller. 

    Is it possible to have Step up/Step down IC  and also  produce voltage output  between 5-12V based on PWM signal for a peltier?

    In regards to the peltier would you a reference designs that shows how to use a PWM based power supply with it?

    Thank You

    Regards

    DJ

  • 0 in reply to DJ15246
    Prodigy 130 points
    Is it possible to have one power regulator to create the 12V and then use a mosfet and PWM driver(either a micro controller OR a FAN speed control IC) to create different outputs?

    If its possible my aim to use a Step down regulator with two output, 12V and 3,3V.

    Then segment the 12V output, two separate outputs to the so that i can control the power from 0 to 12V?

    Can this be possible ?

    Aim is to keep PCB small as possible and use one power DC-DC IC.