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US 8,803,486 B2Granted
Power supply device
AssigneeShin-Kobe Electric Machinery Co., Ltd.
InventorsYasuaki Norimatsu, Shinji Imai
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Abstract
A power supply device according to the present invention includes: a capacitor 10 connected in parallel with a battery; two switching circuits 31,32 connected in series with the capacitor 10; a pre-charge switching circuit 33 connected in parallel with one of the two switching circuits 31,32; and a control unit 14 that, when a voltage of the capacitor 10 is lower than a voltage of the battery 1, controls the pre-charge switching circuit 33 and the switching circuit 32 and performs pre-charging current limitation for the capacitor 10.
Claims1
A power supply device, comprising:
- a capacitor connected in parallel with a battery;
- two switching circuits connected in series with the capacitor;
- a pre-charge switching circuit connected in parallel with one of the two switching circuits;
- and
- a control unit that, when a voltage of the capacitor is lower than a voltage of the battery, controls the pre-charge switching circuit and at least one of the two switching circuits and performs pre-charging current limitation for the capacitor,
- wherein each of the two switching circuits connected in series with the capacitor and the pre-charge switching circuit comprises a single semiconductor switching element, or a plurality of semiconductor switching elements that are connected in parallel;
- wherein the capacitor is a hybrid capacitor doped with lithium ions;
- and
- wherein, during pre-charging current limitation, the control unit controls the semiconductor switching element of the pre-charge switching circuit stepwise, so as to cause pseudo increase of internal resistance of the hybrid capacitor.
6 more elements
Dependencies are inferred from the claim text.