Apparatus for measuring insulation resistance
An apparatus for measuring an insulation resistance according to the present invention includes: a first distribution resistor connected to a positive terminal of a battery and a ground; a first switch connected to the positive terminal of the battery and the first distribution resistor; a second distribution resistor connected to a negative terminal of the battery and the ground; a second switch connected to the negative terminal the battery and the second distribution resistor; and an insulation resistance measurement unit measuring a resistance value of a negative electrode insulation resistor of the battery using a first voltage applied to the first distribution resistor and measuring a resistance value of a positive electrode insulation resistor of the battery using a second voltage applied to the second distribution resistor.
1. An apparatus for measuring an insulation resistance, comprising:
a first distribution resistor connected to a positive terminal of a battery and a ground;
a first switch connected to the positive terminal of the battery and the first distribution resistor;
a second distribution resistor connected to a negative terminal of the battery and the ground;
a second switch connected to the negative terminal of the battery and the second distribution resistor; and
an insulation resistance measurement unit measuring a resistance value of a negative electrode insulation resistor of the battery using a first voltage applied to the first distribution resistor and measuring a resistance value of a positive electrode insulation resistor of the battery using a second voltage applied to the second distribution resistor,
wherein when the resistance value of the positive electrode insulation resistor of the battery is measured, the insulation resistance measurement unit assumes the negative electrode insulation resistor of the battery to have an infinite resistance value, and
when the resistance value of the negative electrode insulation resistor of the battery is measured, the insulation resistance measurement unit assumes the positive electrode insulation resistor of the battery to have an infinite resistance value.
2. The apparatus for measuring an insulation resistance of claim 1 , wherein the insulation resistance measurement unit is connected directly to the first distribution resistor and the second distribution resistor to measure the first voltage and the second voltage.
3. The apparatus for measuring an insulation resistance of claim 1 , wherein the insulation resistance measurement unit controls the first switch and the second switch to be turned on or off to create a current path connected to the positive terminal of the battery, the ground, and the negative terminal of the battery.
4. The apparatus for measuring an insulation resistance of claim 1 , wherein when the resistance value of the positive electrode insulation resistor of the battery is measured, the insulation resistance measurement unit operates the first switch in a turn-off state and the second switch in a turn-on state, and
when the resistance value of the negative electrode insulation resistor of the battery is measured, the insulation resistance measurement unit operates the first switch in a turn-on state and the second switch in a turn-off state.
5. The apparatus for measuring an insulation resistance of claim 1 , further comprising:
a first protective resistor connected to the positive terminal of the battery and the first switch; and
a second protective resistor connected to the negative terminal of the battery and the second switch.
6. The apparatus for measuring an insulation resistance of claim 5 , further comprising a direct current voltage source connected to the second distribution resistor and the ground.
7. The apparatus for measuring an insulation resistance of claim 6 , wherein the insulation resistance measurement unit measures the resistance value of the positive electrode insulation resistor of the battery through the following Equation 1:
Riso
1
=
(
Vb
-
Vdc
V
2
)
R
2
-
(
R
2
+
Ron
2
)
[
Equation
1
]
where Riso 1 is the resistance value of the positive electrode insulation resistor of the battery, Vb is a voltage of the battery, Vdc is a voltage of the direct current voltage source, V 2 is the second voltage applied to the second distribution resistor, R 2 is a resistance value of the second distribution resistor, and Ron 2 is a resistance value of the second protective resistor.
8. The apparatus for measuring an insulation resistance of claim 6 , wherein the insulation resistance measurement unit measures the resistance value of the negative electrode insulation resistor of the battery through the following Equation 2:
Riso
2
=
Vb
V
1
R
1
-
(
R
1
+
Ron
1
)
[
Equation
2
]
where Riso 2 is the resistance value of the negative electrode insulation resistor of the battery, Vb is a voltage of the battery, V 1 is the first voltage applied to the first distribution resistor, R 1 is a resistance value of the first distribution resistor, and Ron 1 is a resistance value of the first protective resistor.