Reverse polarity protection

323

04:55:26

Transitor is only open when positive input voltage is applied. Zener diode protects transitor against excessive Vgs.

published 7 years ago

hurz

7 years ago

body diode is the correct, but source and drain are swapped. in this special case, drain and source must be reverse as you would do it usualy.

selman

7 years ago

Hurz I know it a silly question but why transistor when you can do it with just the diode???

hurz

7 years ago

because a diode does drop some voltage and together with high current its signifucant power you will lose. E.g. diode 0.8V @10A makes 8Watt while a mosfet can have 1mOhm Rdson at 10A is 0.1Watt !

paulvg01

7 years ago

What's the adventage of this over a full-bridge rectifier?

paulvg01

7 years ago

NVM. Realised I'm asking the same question as the last dude.

hurz

7 years ago

a full bridge rectifier does make it even worse in sense of power loss. You drop two times a diode threshold voltage multiplied with current makes e.g. 16Watt instead of 8Watt.

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