transistor switching currents

Discussion in 'General Electronics Chat' started by puya, Oct 8, 2014.

  1. puya

    Thread Starter New Member

    Oct 8, 2014
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    0
    I need to high speed transistor switching currents
    Thanks
    (load is Solenoid with 10 Amper)
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,652
    2,348
    Hello,

    How fast is fast?
    What will be the voltage of the powersupply?

    Bertus
     
  3. puya

    Thread Starter New Member

    Oct 8, 2014
    4
    0
    Solenoid is 24v and Command 24v Coming from PLC
     
  4. puya

    Thread Starter New Member

    Oct 8, 2014
    4
    0
    every 0.5 second
     
  5. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    1,105
    Is the 24V AC or DC?
    If 0.5 sec is the on and off total time, how long will the solenoid stay energised in each cycle?
    What are the solenoid inductance and coil resistance values?
    Have you considered how many on/off cycles the solenoid is rated for?
     
  6. crutschow

    Expert

    Mar 14, 2008
    13,056
    3,245
    Any transistor will be much faster than the solenoid so transistor speed is likely not a consideration.
    What is the current and voltage signal output from the PLC?
     
  7. puya

    Thread Starter New Member

    Oct 8, 2014
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    0
    Solenoid is 24v DC and coil resistance is 4 ohm and Command 24v DC Coming from PLC
    and Solenoid is on for 20 second
    I've used the transistor F9540N but operates with a lag
     
  8. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    5,813
    1,105
    I suspect the lag was due to the current build-up time in the inductance of the solenoid, or to mechanical inertia; not so much the transistor. Can you post a link to the circuit you used?
     
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