Question about gate drive transformers

T

twenglish1

New member
If i understand correctly the high side switch of a half bridge requires 15 volts more than the collector voltage, right? If so, I am wondering how a gate drive transformer accomplishes this, this is a fairly simple question, but it is something I do not understand, as a gate drive transformer is only driven at say 15 volts and only outputting 15 volts on the gate side
 
DjLeco

DjLeco

Moderator
No, the IGBT needs 15 volts between Base (gate) and Emmiter for correct driving and mosfet requires around 10 volts.

The switching devices must be controlled B-E or G-S (if mosfet).

Trafo driver makes galvanically insulated supplies (commands) between low and high side transistors, dedicate drivers have internal level shifter insulation and control (IR2110).

Most usual supply type is bootstrapping (for low and high side).
 
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T

twenglish1

New member
Oh I get it now, so the high side driver is just a way to isolate the high side from the low side, could you explain how bootstrapping works? I have heard that term a lot and still don't understand what it means, or how it works
 
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