Hide side On/Off Switch

Discussion in 'General Electronics Chat' started by SVS, Feb 14, 2014.

  1. SVS

    Thread Starter Member

    Aug 16, 2012
    89
    4
    Hi everyone,

    could someone please suggest me a high side switch just to switch On
    /Off my DC supply voltage to the H bridge circuit.
    Please check the attachment if the question isn't clear.

    Thank you in advance!!
     
  2. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    5,804
    1,105
    What voltage is the supply?
    What is the stall (not running) current of the motor?
    What control voltage are you using for the FETs?
     
  3. SVS

    Thread Starter Member

    Aug 16, 2012
    89
    4
    My bad.

    Sorry for not giving any specs.

    Voltage : 300 V DC
    Max current :5 A
    MOSFET PWM control voltage 12V.
    i thought of 2 options
    1. Solid state relay.
    2 . Fan 7361 IC which is a high side gate driver .

    Are these good solutions.
     
  4. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    5,804
    1,105
    Solid state relay sounds a good option, though I've not used one so can't suggest any particular model.
     
  5. crutschow

    Expert

    Mar 14, 2008
    13,039
    3,243
    I agree with Alec. For that high a voltage, I would use an SSR (but it has to be one designed for DC output, not just AC).
     
  6. SVS

    Thread Starter Member

    Aug 16, 2012
    89
    4

    Why not use FAN 7361 IC .
    Please check my attachment .
    I have made a rough circuit . It is much more cheaper .
    Solid state relay for such a High voltages are expensive.

    Thank you!
     
  7. crutschow

    Expert

    Mar 14, 2008
    13,039
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    Note that this is a bootstrap driver so the amount of time it can be ON is limited by the leakage current discharging the bootstrap capacitor Cb. Does the ON time need to be indefinitely long?
     
  8. SVS

    Thread Starter Member

    Aug 16, 2012
    89
    4
    yes. I was afraid of that .
    the ON time has to be indefinitely long.

    Isn t my capacitor leakage current zero , if it was a ceramic capacitor ?
    or is it just theoretical?
    is it possible to find one at these voltage ratings?
     
    Last edited: Feb 17, 2014
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