Reversed battery protection
January 22, 2009
Hi guys, i'll start by giving you this circuit:
The circuit breaker (the PTC at the top named "CB1") and the Zener diode ("D1") have been added for overcurrent and overvoltage protection. But now my concern now is about protection from reversed batteries. What i wanted to ask you is: is it better to add the p-channel mosfet or shall i take it out?
As for as i understand the circuit, there would be reversed battery protection anyways, since the current would pass through D1 thus short circuiting the robot and activating the PTC, but i am worried that this way the PTC would be stressed to much.
PS: oops i think i connected the Q1 the other way round. (switched source and drain)