Motor vehicle electrical system
First Claim
1. An electrical system for a motor vehicle comprising:
- a plurality of electronic devices each having a power source input;
an energy storage device having a power output;
a power source with a power output;
a switching power supply having a power input and a power output, said power input coupled to said power output of said energy storage device and said power output coupled to said power source inputs of said electronic devices;
switching means for switchably coupling said power output of said power source to said power source inputs of said electronic devices; and
an ignition switch;
whereinsaid switching means is responsively coupled to said ignition switch;
each said electronic device has a first state having a first current draw and a second state of higher current draw than said first state; and
said switching power supply has at least enough power output capability to provide sufficient power to all of said electrical devices when in their first states.
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Accused Products
Abstract
In one embodiment of the present invention, a motor vehicle electrical system has a plurality of electronic modules. The electrical power input of each module is coupled to the output of a switching power supply. Further, the electrical power input of each module is switchably coupled to vehicle system voltage. During "key-on", the switchable connection to vehicle system voltage is closed, thereby providing "key-on" power for the modules from system voltage. During "key-off", the switchable connection is opened, thereby providing "key-off" power for the modules from the switching power supply. In a second embodiment of the present invention, a motor vehicle electrical system has at least one electronic module with a normal power input and a "key-off" power input. The normal power input is coupled to vehicle system voltage, and the "key-off" power input is coupled to the output of a switching power supply. Systems embodying the present invention can reduce "key-off" current draw from the vehicle battery.
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Citations
13 Claims
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1. An electrical system for a motor vehicle comprising:
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a plurality of electronic devices each having a power source input; an energy storage device having a power output; a power source with a power output; a switching power supply having a power input and a power output, said power input coupled to said power output of said energy storage device and said power output coupled to said power source inputs of said electronic devices; switching means for switchably coupling said power output of said power source to said power source inputs of said electronic devices; and an ignition switch;
whereinsaid switching means is responsively coupled to said ignition switch; each said electronic device has a first state having a first current draw and a second state of higher current draw than said first state; and said switching power supply has at least enough power output capability to provide sufficient power to all of said electrical devices when in their first states. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An electrical system for a motor vehicle comprising:
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a switching power supply having a power input and a power output; an energy storage device with a power output coupled to said power input of said switching power supply; a power source with a power output; a plurality of electronic devices each comprising a normal-operation power input and a key-off power input; wherein said normal-operation power inputs are coupled to said power output of said power source; and wherein said key-off power inputs are coupled to said power output of said switching power supply. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification