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-directionalbattery voltage converter selectively transferring a first current between the first battery and the system bus, a second battery, a second bi-directional battery voltageconverter 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 bidirectional battery voltage converter so that the first current and the second current are 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 plurality of switches including a first switch coupling the inductor to the first battery and a second switch coupling the inductor to the system bus, and a routing circuit connected to each of the plurality of switches, and controlling the routing circuit by the controller to open and close each of the plurality of switches 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.
161 Citations
14 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: -
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 bidirectional battery voltage converter so that the first current and the second current are 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 plurality of switches including a first switch coupling the inductor to the first battery and a second switch coupling the inductor to the system bus, and a routing circuit connected to each of the plurality of switches, and controlling the routing circuit by the controller to open and close each of the plurality of switches 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, 11, 12)
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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 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 plurality of switches with a first switch connecting the inductor to the first battery and a second switch connecting the inductor to the system bus, and a routing circuit connected to each of the plurality of switches, and wherein the controller controls the routing circuit to open and close each of the plurality of switches 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 (10, 13, 14)
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Specification