Patent ID: 6489786
Filing Date: 2002-12-03
Classification: G01R

Abstract:
A non-isolated type voltage sensor provided between a battery and a circuit having a pull-up resister which is connected to a reference power supply and a cable, the non-isolated type voltage sensor comprising:a voltage dividing circuit comprising a plurality of resistors connected in series such that the voltage dividing circuit is connected to said battery in parallel, so as to obtain a voltage proportional to a terminal voltage of said battery and less than said reference voltage at a desired voltage dividing point of said plural resistors; a voltage follower which receives an input of a voltage from the voltage dividing point of said voltage dividing circuit; and a voltage-current conversion circuit in which an input thereof is connected to an output of said voltage follower while an output thereof is connected to said cable so that a current proportional to a low impedance output voltage obtained through said voltage follower flows to the ground through an output resistor.