Capacitor device and vehicular power supply device

1. A vehicular power supply device comprising:

a battery;

a capacitor device including a capacitor and a normally open internal relay provided on an electric wire of the capacitor used together with the battery, the normally open internal relay being closed by supplying a power from the battery;

a controller controlling opening and closing of the normally open internal relay; and

a voltage sensor detecting a voltage of the capacitor;

wherein the capacitor device is connected so that, when the normally open internal relay is closed, power is supplied from an alternator to the capacitor, and

wherein, when the detected voltage in a case where the normally open internal relay is closed is lower than a voltage applied from the alternator to the capacitor, the controller determines that the normally open internal relay has a problem in being opened.

2. The vehicular power supply device according to claim 1 , wherein the controller determines a charging state of the capacitor on the basis of the detected voltage in a case where the normally open internal relay is opened.

3. The vehicular power supply device according to claim 1 , further comprising

an adapter being electrically connected to terminals of the capacitor device in a case where the capacitor device is electrically disconnected from the battery and the controller, the adapter forms a discharge circuit of the capacitor in such a manner that the normally open internal relay is closed by a power supplied from the capacitor in a case where the adapter is electrically connected to the terminals of the capacitor device.

4. The vehicular power supply device according to claim 2 , further comprising

an adapter being electrically connected to terminals of the capacitor device in a case where the capacitor device is electrically disconnected from the battery and the controller, the adapter forms a discharge circuit of the capacitor in such a manner that the normally open internal relay is closed by a power supplied from the capacitor in a case where the adapter is electrically connected to the terminals of the capacitor device.

5. A vehicular power supply device comprising:

a battery;

a capacitor device including a capacitor and a normally open internal relay provided on an electric wire of the capacitor used together with the battery, the normally open internal relay being closed by supplying a power from the battery;

a controller controlling opening and closing of the normally open internal relay; and

an adapter being electrically connected to terminals of the capacitor device in a case where the capacitor device is electrically disconnected from the battery and the controller, the adapter forms a discharge circuit of the capacitor in such a manner that the normally open internal relay is closed by a power supplied from the capacitor in a case where the adapter is electrically connected to the terminals of the capacitor device.

6. A vehicular power supply device comprising:

a battery;

a capacitor device including a capacitor and a normally open internal relay electrically connected to the capacitor used together with the battery, the normally open internal relay being closed by supplying a power from the battery;

a diode provided between the normally open internal relay of the capacitor and the battery, the diode inhibits feeding from the capacitor to the battery; and

a controller controlling opening and closing of the normally open internal relay.

7. The vehicular power supply device according to claim 6 , further comprising:

a first power supply wire electrically connected to the anode of the diode, the first power supply wire being capable of feeding from the battery and not feeding from the capacitor; and

a second power supply wire electrically connected to the cathode of the diode, the second power supply wire being capable of feeding from the battery and feeding from the capacitor via the diode.

8. The vehicular power supply device according to claim 6 , further comprising:

a first electric load electrically connected to the first power supply; and

a second electric load electrically connected to the second power supply,

wherein the second electric load needs a larger current than the first electric load.

9. The vehicular power supply device according to claim 8 , wherein the first electric load is one of a headlight or an electronic side mirror.

10. The vehicular power supply device according to claim 8 , wherein the second electric load is one of an engine starter, a seat heater or a rear window defogger.

11. The vehicular power supply device according to claim 6 , wherein the first power supply wire electrically connects to one of a headlight or an electronic side mirror.

12. The vehicular power supply device according to claim 6 , wherein the second power supply wire electrically connects to one of an engine starter, a seat heater or a rear window defogger.

13. The vehicular power supply device according to claim 6 , wherein the maximum current amount fed from the capacitor is larger than the maximum current amount fed from the battery.

14. The vehicular power supply device according to claim 6 , wherein the battery and the capacitor are connected in parallel.

15. The vehicular power supply device according to claim 6 , further comprising:

a switching element to control the normally opened relay, the switching element is fed by the battery, and

wherein the normally opened relay opens when the battery is over-discharged or the batter is disconnected from the vehicular power supply.

16. A power supply kit comprising:

a capacitor device including a capacitor and a normally open internal relay electrically connected to the capacitor; and

an adapter being capable electrically connecting to terminals of the capacitor device, and

wherein the adapter forms a discharge circuit of the capacitor in such a manner that the normally open internal relay is closed by a power supplied from the capacitor in a case where the adapter is electrically connected to the terminals of the capacitor device.

17. The power supply kit according to claim 16 , wherein the adaptor comprises a indicator capable electrically connecting to the capacitor device, the indicator indicates that charge in the capacitor consumes.