• .
  • Willkommen im Forum!
  • Alles beim Alten...
  • Du hast kaum etwas verpasst ;-)
  • Jetzt noch sicherer mit HTTPS
Hallo, Gast! Anmelden Registrieren


H-bridge current sense and protection
#1
I want to design overcurrent protection in my full-brigde, but where to put this and how to make it fast enough? Will a 5-10 mOhm sense resistor on low side of each half-bridge leg affect performance worse than if it is placed on the high side? Second, it is difficult to construct a high side sense circuit that is fast enough to react on individual switch pulses (thinking about using MAX4080 with BW 250kHz), how to overcome this? I suspect that the FETs will die during a short if I have large banks of low-esr caps and sense the current going into the capacitor banks in order to get a slower process to measure.

Edit: here is a suggestion using ordinary op-amp and fets, could this be fast enough and noise immune enough to work?
[Bild: 46_sense2.jpg]
 
  


Nachrichten in diesem Thema
H-bridge current sense and protection - von zilog - 02.01.2006, 09:49 AM