Patent ID: 7015728
Filing Date: 2006-03-21
Classification: G01R,H03F

Abstract:
1. A high voltage floating current sense amplifier circuit for sensing current through a current sense device coupled between an output node and a battery node each referenced to a common node, the battery node for coupling to a positive terminal of a removable battery, said high voltage floating current sense amplifier circuit comprising: a first resistive device having a first end coupled to the output node and a second end; a floating amplifier circuit, coupled to said second end of said first resistive device and for coupling to the battery node, that drives a proportional current through said first resistive device in order to maintain voltage at said second end of said first resistive device at approximately the same voltage as the battery node; and a second resistive device having a first end coupled to said common node and a second end coupled to receive said proportional current for developing a sense voltage indicative of current through said current sense device.