Power supply device for vehicle
First Claim
1. A battery-to-load circuit for a motor vehicle that supplies power from a battery to load, the battery-to-load circuit comprising:
- a power supplying line connected between the battery and the load, said power supplying line having a power wire, a detecting layer made of metal, and an insulating layer being inserted between said power wire and said detecting layer, said detecting layer being maintained at a fixed voltage by means of external resistors; and
detecting means connected to said detecting layer of said power supplying line for detecting whether a short-circuit occurs in the battery-to-load circuit on the basis of a voltage variation of the detecting layer.
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Accused Products
Abstract
A power supply unit is provided between a car-carried battery and load units, such as a light control unit. The power supply unit is connected to the load units through a multi-signal line. The power supply unit calculates a consumption current consumed by the load unit using an operating state of the load unit which is received through the multi-signal line from the load control unit associated with the load unit. The power supply unit compares the calculated consumption current with a supplying current supplied form the battery. If the supplying current is excessively large, the power supply unit interrupts the supply of current from the battery to the load unit. Therefore, the power supply device can detect a phenomenon, for example, a rare short of an extremely short shorting time.
51 Citations
15 Claims
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1. A battery-to-load circuit for a motor vehicle that supplies power from a battery to load, the battery-to-load circuit comprising:
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a power supplying line connected between the battery and the load, said power supplying line having a power wire, a detecting layer made of metal, and an insulating layer being inserted between said power wire and said detecting layer, said detecting layer being maintained at a fixed voltage by means of external resistors; and detecting means connected to said detecting layer of said power supplying line for detecting whether a short-circuit occurs in the battery-to-load circuit on the basis of a voltage variation of the detecting layer. - View Dependent Claims (2, 3)
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4. A battery-to-load circuit for a motor vehicle that supplies power from a battery to a load, the battery-to-load circuit comprising:
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a circuit breaker connecting the battery and the load, said load comprising auxiliary devices, and a resistor connected in parallel across said circuit breaker, said resistor also connecting the battery and the load. - View Dependent Claims (5, 6)
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7. A battery-to-load circuit for a motor vehicle that supplies power from a battery to a load, in which the battery-to-load circuit:
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constantly monitors operating states of load units connected to the battery; calculates currents to be consumed by said load units on the basis of the operating states monitored; detects a supplied current from the battery to said load units; compares the calculated consumption current of said load units with the current supplied from the battery to said load units; and interrupts the supply of electric power from the battery to the associated load unit when the supplied current is either excessively larger or smaller than the calculated consumption current. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A room lamp device for a motor vehicle wherein a room lamp may be placed in a mode selected from one of three modes, said room lamp device connecting a battery and a door switch, said door switch being either turned on or off with the opening and closing of a motor vehicle door, said three modes comprising a light-on mode in which the room lamp is always in an on state, a light-off mode in which the room lamp is always in an off state, and a temporary light-on mode in which the room lamp is either in the on state or the off state, said room lamp device comprising:
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a lamp switch inserted between the door switch and the battery;
which places said room lamp in a selected mode dependent upon said door switch being turned on or off; anda controller which turns off the room lamp when said lamp switch is set in the light-on mode for a preset time. - View Dependent Claims (15)
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Specification