Switch device for on-board power supply and on-board power supply device
A relay module includes: power supply lines; main relay; sub relay with different current capacities. The first power supply line is connected to a main battery, the second power supply line is connected to a sub battery, and the third power supply line is connected to a load. The main relay is between the first and third power supply lines. The sub relay is between the second and third power supply lines. The main relay disconnects when a ground fault occurs in the first power supply line, and connects when a ground fault occurs in the second power supply line. The sub relay disconnects with a ground fault in the second power supply line, and connects with a ground fault in the first power supply line. Whichever one of the main relay and the sub relay has a larger current capacity becomes electrically connected, and the other becomes electrically disconnected.
1. An on-board power supply switch device that is to be interposed between: a set of a first power storage device and a second power storage device that are both mounted on a vehicle; and a load that is mounted on the vehicle and that can operate using power supplied from either of the first power storage device or the second power storage device, the on-board power supply switch device comprising:
a first power supply line that is to be connected to the first power storage device;
a second power supply line that is to be connected to the second power storage device;
a third power supply line that is to be connected to the load;
a first switch that is provided between the first power supply line and the third power supply line;
a second switch that is provided between the second power supply line and the third power supply line, and is different from the first switch in current capacity; and a control circuit,
wherein, when it is determined that an abnormality has occurred in the first power supply line, the first switch becomes electrically disconnected, and when it is determined that an abnormality has occurred in the second power supply line, the first switch becomes electrically connected,
when it is determined that an abnormality has occurred in the second power supply line, the second switch becomes electrically disconnected, and when it is determined that an abnormality has occurred in the first power supply line, the second switch becomes electrically connected,
when it is determined that no abnormality has occurred in either the first power supply line or the second power supply line, whichever one of the first switch and the second switch has a larger current capacity becomes electrically connected, and the other becomes electrically disconnected,
the load operates in either a first mode, or a second mode in which power consumption is lower than that in the first mode,
when it is determined that an abnormality has occurred in either the first power supply line or the second power supply line, the control circuit causes the load to operate in the second mode, and
when it is determined that a voltage drop has been resolved in both the first power supply line and the second power supply line, the control circuit causes the load to operate in the first mode.
2. The on-board power supply switch device according to claim 1 , wherein a current capacity of the second switch is larger than a current capacity of the first switch, and
when it is determined that a ground fault has occurred in the second power supply line, the first switch becomes electrically connected after the second switch has become electrically disconnected.
3. The on-board power supply switch device according to claim 1 , wherein a current capacity of the second switch is smaller than a current capacity of the first switch, and
when it is determined that a ground fault has occurred in the first power supply line, the second switch becomes electrically connected after the first switch has become electrically disconnected.
4. An on-board power supply switch device that is to be interposed between: a set of a first power storage device and a second power storage device that are both mounted on a vehicle; and a load that is mounted on the vehicle and that can operate using power supplied from either of the first power storage device or the second power storage device, the on-board power supply switch device comprising:
a first power supply line that is to be connected to the first power storage device; a second power supply line that is to be connected to the second power storage device; a third power supply line that is to be connected to the load;
a first switch that is provided between the first power supply line and the third power supply line; and
a second switch that is provided between the second power supply line and the third power supply line, and is different from the first switch in current capacity,
wherein, when it is determined that an abnormality has occurred in the first power supply line, the first switch becomes electrically disconnected, and when it is determined that an abnormality has occurred in the second power supply line, the first switch becomes electrically connected,
when it is determined that an abnormality has occurred in the second power supply line, the second switch becomes electrically disconnected, and when it is determined that an abnormality has occurred in the first power supply line, the second switch becomes electrically connected,
when it is determined that no abnormality has occurred in either the first power supply line or the second power supply line, whichever one of the first switch and the second switch has a larger current capacity becomes electrically connected, and the other becomes electrically disconnected,
a current capacity of the second switch is larger than a current capacity of the first switch, and
when it is determined that a voltage drop has occurred in the second power supply line, the second switch becomes electrically disconnected after the first switch has become electrically connected.
5. The on-board power supply switch device according to claim 4 , wherein, when it is determined that a voltage drop in the second power supply line has been resolved, the first switch becomes electrically disconnected after the second switch has become electrically connected.
6. The on-board power supply switch device according to claim 4 , further comprising:
a control circuit,
wherein the load operates in either a first mode, or a second mode in which power
consumption is lower than that in the first mode, and when it is determined that an abnormality has occurred in either the first power supply line or the second power supply line, the control circuit causes the load to operate in the second mode.
7. The on-board power supply switch device according to claim 6 , wherein, when
it is determined that a voltage drop has been resolved in both the first power supply line and
the second power supply line, the control circuit causes the load to operate in the first mode.
8. An on-board power supply device comprising:
the on-board power supply switch device according claim 4 ;
the first power storage device; and
the second power storage device.
9. An on-board power supply switch device that is to be interposed between: a set of a first power storage device and a second power storage device that are both mounted on a vehicle; and a load that is mounted on the vehicle and that can operate using power supplied from either of the first power storage device or the second power storage device, the on-board power supply switch device comprising:
a first power supply line that is to be connected to the first power storage device;
a second power supply line that is to be connected to the second power storage device;
a third power supply line that is to be connected to the load;
a first switch that is provided between the first power supply line and the third power supply line; and
a second switch that is provided between the second power supply line and the third power supply line, and is different from the first switch in current capacity,
wherein, when it is determined that an abnormality has occurred in the first power supply line, the first switch becomes electrically disconnected, and when it is determined that an abnormality has occurred in the second power supply line, the first switch becomes electrically connected,
when it is determined that an abnormality has occurred in the second power supply line, the second switch becomes electrically disconnected, and when it is determined that an abnormality has occurred in the first power supply line, the second switch becomes electrically connected,
when it is determined that no abnormality has occurred in either the first power supply line or the second power supply line, whichever one of the first switch and the second switch has a larger current capacity becomes electrically connected, and the other becomes electrically disconnected,
a current capacity of the second switch is smaller than a current capacity of the first switch, and
when it is determined that a voltage drop has occurred in the first power supply line, the first switch becomes electrically disconnected after the second switch has become electrically connected.
10. The on-board power supply switch device according to claim 9 , wherein, when it is determined that a voltage drop in the first power supply line has been resolved, the second switch becomes electrically disconnected after the first switch has become electrically connected.
11. The on-board power supply switch device according to claim 9 , further comprising a control circuit, wherein the load operates in either a first mode, or a second mode in which power consumption is lower than that in the first mode, and
when it is determined that an abnormality has occurred in either the first power supply line or the second power supply line, the control circuit causes the load to operate in the second mode.
12. An on-board power supply device comprising:
the on-board power supply switch device according to claim 9 ;
the first power storage device; and
the second power storage device.
13. An on-board power supply switch device that is to be interposed between: a set of a first power storage device and a second power storage device that are both mounted on a vehicle; and a load that is mounted on the vehicle and that can operate using power supplied from either of the first power storage device or the second power storage device, the on-board power supply switch device comprising:
a first power supply line that is to be connected to the first power storage device;
a second power supply line that is to be connected to the second power storage device;
a third power supply line that is to be connected to the load;
a first switch that is provided between the first power supply line and the third power supply line;
a second switch that is provided between the second power supply line and the third power supply line, and is different from the first switch in current capacity; and
a third switch that is connected between the first power supply line and the second power supply line,
wherein, when it is determined that an abnormality has occurred in the first power supply line, the first switch becomes electrically disconnected, and when it is determined that an abnormality has occurred in the second power supply line, the first switch becomes electrically connected,
when it is determined that an abnormality has occurred in the second power supply line, the second switch becomes electrically disconnected, and when it is determined that an abnormality has occurred in the first power supply line, the second switch becomes electrically connected,
when it is determined that no abnormality has occurred in either the first power supply line or the second power supply line, whichever one of the first switch and the second switch has a larger current capacity becomes electrically connected, and the other becomes electrically disconnected, and
when it is determined that a ground fault has occurred in either the first power supply line or the second power supply line, the third switch becomes electrically disconnected, and when it is determined that a voltage drop has occurred in either the first power supply line or the second power supply line, the third switch becomes electrically connected.
14. The on-board power supply switch device according to claim 8 ,
wherein a current capacity of the second switch is larger than a current capacity of the first switch, and
when it is determined that a ground fault has occurred in the second power supply line, the second switch becomes electrically disconnected after the third switch has become electrically disconnected, and the first switch becomes electrically connected after the second switch has become electrically disconnected.
15. The on-board power supply switch device according to claim 8 ,
wherein a current capacity of the second switch is smaller than a current capacity of the first switch, and
when it is determined that a ground fault has occurred in the first power supply line, the first switch becomes electrically disconnected after the third switch has become electrically disconnected, and the second switch becomes electrically connected after the first switch has become electrically disconnected.
16. The on-board power supply switch device according to claim 13 , further comprising a control circuit, wherein the load operates in either a first mode, or a second mode in which power consumption is lower than that in the first mode, and
when it is determined that an abnormality has occurred in either the first power supply line or the second power supply line, the control circuit causes the load to operate in the second mode.
17. An on-board power supply device comprising:
the on-board power supply switch device according to claim 13 ;
the first power storage device; and
the second power storage device.