Bi-directional battery voltage converter
First Claim
1. A method of balancing current in a vehicle electric system, the vehicle electrical system comprising a system bus, a first battery, a first bi-directional battery voltage converter selectively transferring a first current between the first battery and the system bus, a second battery, a second bi-directional battery voltage converter selectively transferring a second current between the second battery and the system bus, and a controller controlling the first bi-directional battery voltage converter and the second bi-directional battery voltage converter, the method comprising:
- sensing the first current;
providing a first signal related to the first current to the controller;
sensing the second current;
providing a second signal related to the second current to the controller; and
controlling the first bi-directional battery voltage converter and the second bi-directional battery voltage converter so that the first current and the second current are equal portions of a load current supplied to an electrical load connected to the system bus, wherein the first bi-directional battery voltage converter includes an inductor, a first switch coupled to the first battery, a second switch coupled to the first battery, a third switch coupled to the system bus, a fourth switch coupled to the system bus, and a routing circuit connected to each of the first, second, third, and fourth switches, andcontrolling the routing circuit by the controller to open and close each of the first, second, third and fourth switches in pairs to charge the inductor from one of the vehicle electrical system and the first battery and to discharge the inductor to the other of the vehicle electrical system and the first battery.
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Accused Products
Abstract
A method of balancing current in a vehicle electric system having a system bus, a first battery, a first bi-directional battery voltage converter selectively transferring a first current between the first battery and the system bus, a second battery, a second bi-directional battery voltage converter selectively transferring a second current between the second battery and the system bus, and a controller controlling the first bi-directional battery voltage converter and the second bi-directional battery voltage converter. The method includes sensing the first current and sensing the second current. The first bi-directional battery voltage converter and the second bi-directional battery voltage converter are controlled so that the first current and the second current are equal portions of a load current supplied to an electrical load connected to the system bus.
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Citations
16 Claims
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1. A method of balancing current in a vehicle electric system, the vehicle electrical system comprising a system bus, a first battery, a first bi-directional battery voltage converter selectively transferring a first current between the first battery and the system bus, a second battery, a second bi-directional battery voltage converter selectively transferring a second current between the second battery and the system bus, and a controller controlling the first bi-directional battery voltage converter and the second bi-directional battery voltage converter, the method comprising:
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sensing the first current; providing a first signal related to the first current to the controller; sensing the second current; providing a second signal related to the second current to the controller; and controlling the first bi-directional battery voltage converter and the second bi-directional battery voltage converter so that the first current and the second current are equal portions of a load current supplied to an electrical load connected to the system bus, wherein the first bi-directional battery voltage converter includes an inductor, a first switch coupled to the first battery, a second switch coupled to the first battery, a third switch coupled to the system bus, a fourth switch coupled to the system bus, and a routing circuit connected to each of the first, second, third, and fourth switches, and controlling the routing circuit by the controller to open and close each of the first, second, third and fourth switches in pairs to charge the inductor from one of the vehicle electrical system and the first battery and to discharge the inductor to the other of the vehicle electrical system and the first battery. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A vehicle electrical system for supplying electrical power to an electrical load, the system comprising:
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a system bus, a first battery; a first bi-directional battery voltage converter controllably transferring a first current between the first battery and the system bus; a second battery; a second bi-directional battery voltage converter controllably transferring a second current between the second battery and the system bus; and a controller for controlling the first bi-directional battery voltage converter and the second bi-directional battery voltage converter such that the first current and the second current are equal portions of a load current supplied to an electrical load connected to the system bus, wherein the first bi-directional battery voltage converter includes an inductor, a first switch selectively connecting the inductor to the first battery, a second switch selectively connecting the inductor to the first battery, a third switch selectively connecting the inductor to the system bus, a fourth switch selectively connecting the inductor to the system bus, and a routing circuit, controlled by the controller, opening and closing the first, second, third, and fourth switches in pairs to charge the inductor from one of the vehicle electrical system and the battery and to discharge the inductor to the other of the vehicle electrical system and the first battery. - View Dependent Claims (10, 11, 12)
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13. A bi-directional battery voltage converter for use with a vehicle electrical system, comprising:
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an inductor; a first switch selectively coupling the inductor to a first battery; a second switch selectively coupling the inductor to the first battery; a third switch selectively coupling the inductor to the vehicle electrical system; a fourth switch selectively coupling the inductor to the vehicle electrical system; a routing circuit connected to each of the first, second, third, and fourth switches, the routing circuit controllably opening and closing the switches in pairs such that the inductor is charged from one of the vehicle electrical system and the battery and discharged to the other of the vehicle electrical system and the battery; and a controller controlling the routing circuit to deliver a portion of a load current supplied to a connected electrical load, the portion based upon the availability of other current sources. - View Dependent Claims (14, 15, 16)
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Specification