Power supply circuit for an automobile
First Claim
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1. A power supply circuit for an automobile comprising:
- an electric automotive appliance;
a main battery for supplying power to said electric automotive appliance;
a backup battery for supplying power to said electric automotive appliance;
an ignition key switch connected between said main battery and said electric automotive appliance;
battery switching circuit means for connecting one of said main battery and said backup battery to said electric automotive appliance in accordance with a condition of said ignition key switch;
power detecting means for detecting a charged power in said backup battery;
operation limitation means for limiting an operation of said electric automotive appliance to substantially reduce an amount of power required by said electric automotive appliance; and
control unit means for activating said operation limitation means when said power detecting means detects that a charged power in said backup battery is below a predetermined level.
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Abstract
A power supply circuit for an automobile including an electric automotive appliance having a memory, a main battery, a backup battery, an ignition key switch, a battery switching circuit for connecting one of the main and backup batteries to the electric automotive appliance, a power detector for detecting a charged power in the backup battery, a limiting circuit for limiting the operation of the electric automobile appliance to only a power backup of the memory, and a control circuit for activating the limiting circuit when a charged power in the backup battery is detected to be below a predetermined level.
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Citations
12 Claims
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1. A power supply circuit for an automobile comprising:
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an electric automotive appliance; a main battery for supplying power to said electric automotive appliance; a backup battery for supplying power to said electric automotive appliance; an ignition key switch connected between said main battery and said electric automotive appliance; battery switching circuit means for connecting one of said main battery and said backup battery to said electric automotive appliance in accordance with a condition of said ignition key switch; power detecting means for detecting a charged power in said backup battery; operation limitation means for limiting an operation of said electric automotive appliance to substantially reduce an amount of power required by said electric automotive appliance; and control unit means for activating said operation limitation means when said power detecting means detects that a charged power in said backup battery is below a predetermined level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification