A switch driving circuit electrically opens and closes a switch circuit (5) including two N-channel type semiconductor switching elements (6a, 6b) series connected in opposite directions, thereby electrically opening and closing an electrical path between ...

Disclosed herein, among other things, are apparatus and methods for detecting and switching battery polarity in a battery charger. In various embodiments, a method includes grounding a first terminal of a battery inserted in a charger and sensing a bipolar...

A control circuit for preventing a battery group (101) from being reversely connected includes a normally-open contactor (102), a first normally-open relay (103), a first diode (104), a second diode (105), a second normally-open relay (106), a third diode ...