Electrical – PWM solar charge controller MOSFET

mosfetpwmsolar energy

This diagram is from a PWM solar charge controller datasheet,

http://www.epsolarpv.com/en/uploads/news/201310/1382338419195066.pdf

I have 2 questions about it:

1-Why they used two MOSFET in series rather than one?

2-Can we simply increase the max. current of any PWM solar charger by replacing its MOSFETs by another with higher current or it need to more modifications?

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Best Answer

  1. I've seen this MOSFET configuration in a surge stopper circuit with an ideal diode (e.g. LTC4364). One MOSFET clamps the voltage if it goes above a certain level, while the other prevents reverse current with a smaller voltage drop (and thus less power dissipation) than a diode.

  2. It's not just the MOSFETs that determine the rating of a power converter such as this. Protection and control circuitry, the current sensor, and internal wiring are designed and rated up to a specific power level. Simply replacing the MOSFETs with beefier ones will not achieve a higher-current PWM controller, and could easily compromise safety. Just buy/acquire a different one.

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