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Speed of DC solid state relays?

Discussion in 'Electronic Basics' started by BobG, May 16, 2005.

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  1. BobG

    BobG Guest

    Anyone know how fast you can turn these on and off? Can I make a motor
    controller out of em and run em at 1KHz?
     
  2. John Larkin

    John Larkin Guest

    Well, the datasheets have the specs. But if you're thinking PWM at 1
    KHz, probably not; the optocoupled SSRs are pretty slow.

    John
     
  3. Chris

    Chris Guest

    All of these solid state relays have data sheets, and you can easily
    look up the specs for the part you have or want.

    The standard DC SSR will switch on fast enough, but will switch off too
    slowly to get a decent response for 1KHz. If you look at the data
    sheet for a standard DC power SSR, the Opto 22 DC60

    http://www.opto22.com/asset/documents/0859_Solid_State_Relays_data_sheet.pdf

    you'll see that they guarantee turn-on time of 100us, but turn-off is
    750us. That's going to make a mess out of 1KHz.

    There are SSRs which have been optimized for higher speed switching,
    but you have to provide a little more information about your
    application if you want a recommendation.

    Good luck
    Chris
     
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