Non-isolated type voltage sensor

摘要

A non-isolated type voltage sensor provided between a battery 15 of less than 60V and a circuit having a resistor Rg an end of which is connected to a wire harness 19 while the other end thereof is connected to a reference power supply, the non-isolated type voltage sensor comprising: voltage dividing circuits Rd, Rf including plural resistors connected in series such that those resistors are connected to the battery 15 in parallel, so as to obtain a voltage proportional to a terminal voltage of the battery 15 and less than the reference voltage at a desired voltage dividing point of the plural resistors; a voltage follower 18 which receives an input of a voltage from the voltage dividing point of this voltage dividing circuit; and a voltage-current conversion circuit 20 including a FETQ1 so as to supply a current proportional to a low impedance output voltage obtained through the voltage follower 18 to the ground through a resistor Rh.