Charging management apparatus
An on-board charging management apparatus includes a vehicle-side earth line connected with an external-side earth line of an external power unit; a vehicle-side signal line connected with an external-side signal line of the external power unit; and a detection signal line configured to connect the vehicle-side signal line and the vehicle-side earth line. Presence or absence of a disconnection of the external-side earth line and the vehicle-side earth line is determined based on an electric current value or a voltage value of the detection signal line, when the external power unit is in a connected state. As a consequence, the on-board charging management apparatus can detect a disconnection of the earth line at the time of charging an on-board electric storage device.
1. An on-board charging management apparatus that charges an on-board electric storage device with electric power from an external power unit, the charging management apparatus comprising:
a vehicle-side earth line connected with an external-side earth line of the external power unit;
an external-side connection signal line connected to the external-side earth line on an external power unit side, the external-side connection signal line is connected with a vehicle-side connection signal line;
a vehicle-side signal line connected with an external-side signal line of the external power unit;
a detection signal line positioned on a vehicle side and configured to connect the vehicle-side signal line and the vehicle-side earth line; and
a disconnection determination device configured to determine presence or absence of a disconnection of at least one of the external-side earth line or the vehicle-side earth line, based on an electric current value of the detection signal line, when the external power unit is in a connected state based on an electric current value of the external-side connection signal line.
2. The charging management apparatus according to claim 1 ,
wherein the disconnection determination device includes a current detector configured to detect electric current flowing through the detection signal line, and
wherein the disconnection determination device is configured to determine a disconnection of at least one of the external-side earth line or the vehicle-side earth line, when the electric current is not detected by the current detector.
3. The charging management apparatus according to claim 2 , wherein the current detector is a photo-coupler.
4. The charging management apparatus according to claim 2 , wherein the current detector is an ammeter.
5. The charging management apparatus according to claim 2 ,
wherein the external-side signal line is connected to a reference potential through an external-side resistance, and
wherein the disconnection determination device includes a vehicle-side resistance connected to the detection signal line in series with the current detector.
6. The charging management apparatus according to claim 1 , wherein the disconnection determination device is configured to prohibit charging, when a disconnection of the external-side earth line, the vehicle-side earth line, or the external-side earth line and the vehicle-side earth line is determined.
7. The charging management apparatus according to claim 2 , wherein the current detector is a photo-coupler configured to display whether or not an electric current flows through the detection signal line.
8. An on-board charging management apparatus that charges an on-board electric storage device with electric power from an external power unit, the charging management apparatus comprising:
a vehicle-side earth line connected with an external-side earth line of the external power unit;
an external-side connection signal line connected to the external-side earth line on an external power unit side, the external-side connection signal line is connected with a vehicle-side connection signal line;
a vehicle-side signal line connected with an external-side signal line of the external power unit;
a detection signal line positioned on a vehicle side and configured to connect the vehicle-side signal line and the vehicle-side earth line; and
a disconnection determination device configured to determine presence or absence of a disconnection of at least one of the external-side earth line or the vehicle-side earth line, based on a voltage value of the detection signal line, when the external power unit is in a connected state based on an electric voltage value of the external-side connection signal line.
9. The charging management apparatus according to claim 8 ,
wherein the disconnection determination device includes a voltage detector configured to detect the voltage value of the detection signal line, and
wherein the disconnection determination device is configured to determine a disconnection of at least one of the external-side earth line or the vehicle-side earth line, when the voltage value is not detected by the voltage detector.
10. The charging management apparatus according to claim 9 , wherein the voltage detector is a voltage sensor.
11. The charging management apparatus according to claim 9 ,
wherein the external-side signal line is connected to a reference potential through an external-side resistance, and
wherein the disconnection determination device includes a vehicle-side resistance connected to the detection signal line in parallel with the voltage detector.
12. The charging management apparatus according to claim 8 , wherein the disconnection determination device is configured to prohibit charging, when a disconnection of at least one of the external-side earth line or the vehicle-side earth line is determined.