| 摘要 |
PURPOSE: An insulation resistance measuring circuit using an operational amplifier is provided to precisely measure the insulation resistance of a battery. CONSTITUTION: A source resistor(103,104) includes a first source resistor connected to a second source resistor and a plus terminal of a battery and the second source resistor connected to the first source resistor and a minus terminal of the battery. A voltage sensor(110) senses the voltage of the first source resistor source as a first voltage, senses the voltage of the second source resistor as a second voltage, and senses the voltage of the battery as a (5-1)-th voltage. An operational amplifier(120) generates a sixth voltage by subtracting the (5-1)-th voltage from the third voltage which is obtained by subtracting the second voltage from the first voltage, generates a seventh voltage by subtracting the (5-1)-th voltage from the fourth voltage by subtracting the first voltage from the second voltage, and outputs the addition of the sixth voltage and the seventh voltage. |
