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Solar PWM Charging Mosfet Selection

Discussion in 'Renewable Energy' started by sonar_abhi, Apr 15, 2016.

  1. sonar_abhi

    sonar_abhi New Member

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    Hello Guys.

    I am making a Solar Charge Controller with PWM. For PWM, I need to connect the MOSFET to the high side so as to control the current going into the battery from the panel.

    If I connect an N channel MOSFET, that would need a charge pump to increase the gate voltage above the Vdd.
    But if I use a P channel MOSFET, that would not be necessity, since I only need to turn off the gate supply for the MOSFET to conduct and vice versa.

    Some of the examples on the net have used N channel with a charge pump and I really dont understand why they have not used a P channel MOSFET instead.

    What would be a better selection in terms of efficiency and power dissipation.

    Thanks
    AS
     

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  2. MikeMl

    MikeMl Well-Known Member Most Helpful Member

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    What battery voltage?
    How much current?
    Why PWM instead of just On/Off based on battery voltage?
     
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