Current Sense Apparatus for Battery Charger Systems

摘要

A current sense apparatus comprises a first switch having a first terminal connected to a power source and a second terminal connected to a battery, a second switch comprising a gate connected to a gate of the first switch and a first terminal connected to the first terminal of the first switch, a first operational amplifier having a first input connected to the second terminal of the first switch and a second input connected to a second terminal of the second switch, a second operational amplifier having an output connected to the gate of the first switch, a first input coupled to the first terminal of the first switch and a second input coupled to the second terminal of the first switch and a reference voltage source connected to one input of the second operational amplifier.

主权项

1. A system comprising:
a first switch coupled between a power source and a load; a second switch comprising a gate connected to a gate of the first switch and a first terminal connected to a first terminal of the first switch; a first operational amplifier having a first input connected to a second terminal of the first switch and a second input connected to a second terminal of the second switch; a second operational amplifier having an output connected to the gate of the first switch, a first input coupled to the first terminal of the first switch and a second input coupled to the second terminal of the first switch; and a reference voltage source connected to one input of the second operational amplifier.