Non-isolated type voltage sensor
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United States of America Patent
Stats
-
Dec 3, 2002
Grant Date -
N/A
app pub date -
Oct 12, 2000
filing date -
Oct 25, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A non-isolated type voltage sensor is provided between a battery of less than 60 V and a circuit having a resistor, an end of which is connected to a wire harness while another end is connected to a reference power supply. The non-isolated type voltage sensor includes voltage dividing circuits, which include plural resistors connected in series such that those resistors are connected to the battery in parallel so as to obtain a voltage proportional to a terminal voltage of the battery and less than the reference voltage at a desired voltage dividing point of the plural resistors, a voltage follower, which receives an input of a voltage from the voltage dividing point of the voltage dividing circuit, and a voltage-current conversion circuit including a FET so as to supply a current proportional to a low impedance output voltage obtained through the voltage follower to the ground through a resistor.
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