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Communication Circuit In Inverter AC PCB Board

Discussion in 'Power Electronics' started by suyog, Mar 22, 2020.

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  1. suyog


    Apr 22, 2016
    Hie Guys,

    I am working in Inverter Air conditioner PCB Board. I am getting stuck at communication signal circuit which is coming from Indoor Unit to Outdoor Unit. Circuit coupled with 2K 5% 3W resistor , 14D618K mov capacitor which further connected with two pc817 optocoupler interfaced with microcontroller.

    Can anyone help to figure the schematic or working of this circuit.

  2. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    Not with the scarce "detail" you've given.
    How about, for starters, a model number and a description of the problem you are working on?
    suyog likes this.
  3. dave9


    Mar 5, 2017
    I'm going to go out on a limb here and suggest that what you are stating is incorrect.

    It looks like you have just pictured a power supply board that has nothing to do with indoor, outdoor unit communication, unless they happened to integrate that feature onto the PSU board, which I would assume is not the case unless it does not have additional circuit boards for the control circuits.

    Indoor - outdoor communication is probably nothing more than an on/off signal, maybe not even a signal in the digital sense, nothing more than a pair of power leads going to a relay to power its coil.

    Why are you calling it an "inverter"? Inverter typically means it turns DC into AC while I suspect your board is doing the opposite, taking AC mains and converting to DC for the logic and relay activation.

    I may have assumed too much, just seeing that small area of one circuit board and not having any description of the problem.

    FYI, one of the most common reasons why an outdoor condenser unit won't start, is a failed motor start/run capacitor. Certainly if it is relay activated, a bad relay or wiring is possible too, or a refrigerant leak can cause a freeze-up, or compressor could go out, etc.
  4. suyog


    Apr 22, 2016
    Here I have attached full indoor pcb schematic. As I have understood rx and tx signal generated using AC line most probably pwm frequency of 50HZ.
    fig-5 (1).jpg
    Following circuit is communication Circuit in the indoor pcb which used to transmit and receive the data.

    Outdoor Unit also has same communication circuit as follows
    Communication circuit as follows

    I hope this would be clear picture. I would like to is it possible to use ac voltage for transmission. Thanks.
    Sure likes this.
  5. Sure


    Feb 28, 2021
    Sir how you get this Ac board schematic pls replay and help me I am ac mechanic
    Last edited by a moderator: Feb 28, 2021
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