Leakage detector for a power supply apparatus for a vehicle
AssigneeSanyo Electric Co., Ltd.
InventorKimihiko Furukawa
Life of this patent
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Abstract
A leakage detector for a power supply apparatus for a vehicle having a voltage detection circuit that detects voltages of a plurality of battery modules. The voltage detection circuit comprises a multiplexer that switches the battery modules voltages of which are detected in a time sharing manner, and a voltage detection portion that detects the voltages of the battery modules switched by the multiplexer. In the power supply apparatus, a particular point of the battery module is connected to a chassis through a leakage detection resistance, and the voltage detection circuit detects a chassis voltage that is induced between the ends of the leakage detection resistance by switching the multiplexer of the voltage detection circuit to detect a leakage resistance based on the chassis voltage.
Claims16
A power supply apparatus for a vehicle, the power supply apparatus comprising:
- a driving battery including a plurality of battery modules that are connected to each other in series, said driving battery to be connected to a chassis of the vehicle via a leakage detection resistance;
- and
- a voltage detection circuit operable to detect a voltage of said driving battery, said voltage detection circuit comprising:
- a multiplexer having a plurality of channels, with a number of said plurality of channels being not less than a number of said plurality of battery modules of said driving battery, said multiplexer being operable to switch one of said plurality of battery modules of said driving battery of which a voltage is to be detected;
- and
- a voltage detection portion operable to detect a voltage of one of said plurality of battery modules of said driving battery switched to by said multiplexer;
- wherein said voltage detection circuit is operable to detect a chassis voltage induced across said leakage detection resistance by switching to one of said plurality of channels of said multiplexer of said voltage detection circuit which is not in use for switching said plurality of battery modules of said driving battery, thereby detecting a leakage resistance based on said chassis voltage.
A leakage detector for use with an ungrounded power supply having at least one battery module and to be carried in a chassis, said leakage detector comprising:
- a leak detection resistor operable to be connected between the power supply and a chassis ground;
- and
- a voltage detection circuit operable to measure a voltage of said at least one battery module and operable to measure a chassis voltage induced across said leakage detection resistor.
Dependencies are inferred from the claim text.