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Pulse width modulation

Discussion in 'General Electronics Discussion' started by Electron point, Feb 20, 2012.

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  1. Electron point

    Electron point

    1
    0
    Feb 20, 2012
    Hi Folks

    I am fairly new to this - as my question will show....

    Is there a way to reduce from 12 volts to say 2 volts without wasting power and needing a big heat sink when drawing about 10 amps ?.

    Does a pulse width modulator do that? I see some advertise that they don't need heat sinks.
    I'd like to make a pulse with modulator that is adjustable so as the unit gets hotter the power required remains the stable (over a range of temperatures)

    Thanks

    Gerry
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,378
    2,770
    Jan 21, 2010
    PWM, well, kinda.

    It depends on what you're driving.

    If it's a motor it will probably work, but for an electrical circuit you will need DC, in which case a switchmode regulator is required.
     
  3. jackorocko

    jackorocko

    1,284
    1
    Apr 4, 2010
    Power and heat are very closely related. Doesn't seem to me that you can maintain the same power level and reduce heat. A watt is a watt.
     
  4. Rleo6965

    Rleo6965

    585
    9
    Jan 22, 2012
    My idea was to have a power transformer that have multi-tapped secondary with automatic selector switch to feed selected bridge rectifier then pass a voltage regulator. Voltage drop to series pass transistor therefore would be minimal. It's only an idea. But maybe it can be done. This is linear solution not pwm.
     
    Last edited: Feb 20, 2012
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