Help with 0 to 10 volt PWM


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  1. #1
    Trevean
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    Default Help with 0 to 10 volt PWM

    Looking for some advice please, need to get a 0 to 10 volt output to control a Proportional Power Controller (RS Stock No.708-2080) The max current is only 0.1 amp. Some background info in case it helps, we have a 4kw solar array on a tracker controlled by a PC, the PC also monitors the incoming grid current and the current generated by the solar array, the idea is then for the PC to control the Proportional Power Controller connected to an immersion heater when there is spare power from the solar. The plan is/was to have the PC control a 16F88, via a Tibbo, so would have an ADC to monitor the current supplied to the heater via a CT and PWM off portB.0 but of course that's only 0 to 5 volts, so how to get 0 to 10 volts? if anyone can point me in the right direction I would be grateful.

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    Default Re: Help with 0 to 10 volt PWM

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    This is what I used it works really well, It may be of help to you
    Steve

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    Trevean
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    Default Re: Help with 0 to 10 volt PWM

    Many Thanks for the info Steve, just what I needed. I was going round in circles with this.

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    Prolific Poster pic-ignorant's Avatar
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    Default Re: Help with 0 to 10 volt PWM

    How would you interface that to the outside world Steve? ie shorted output, or connected to a low impedance load

    John

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    Default Re: Help with 0 to 10 volt PWM

    Well in my application it just connects to the circuit that drives some mosfets and ok with my circuit, It just produces 0-10V
    No sure what your trying to get at there John
    Steve

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    Default Re: Help with 0 to 10 volt PWM

    Hi steve,
    I wasn't questioning your design, I am thinking of adding 0-10v as an output on one of my boards. I am guessing your 0-10v is on-board? In my case, I need to be able to connect this to an external device,, ie motor controller etc, so I would need to make it as rugged as possible, so the op-amp wouldn't get damaged if connected to a low-impedance source, or shorted to 0v etc

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    Default Re: Help with 0 to 10 volt PWM

    Sorry John it did not mean to come across like that,
    Yes my is only feeding a signal on aboard, Could you use the 0-10v to drive a Fet or something like that to drive the motor, I drive Fet's via another op-amp in totem pole sytle driver(If I remember that's what they call it) but I'm using it has a load rather than a motor driver
    The schematic of the 0-10V I found on the PBP site sometime ago
    Steve

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