Bi-directional battery voltage converter
First Claim
Patent Images
1. An electrical system for a vehicle, comprising:
- a system bus;
an alternator supplying a current to the system bus when mechanically driven by a prime mover;
an ignition switch selecting an operational state of the electrical system;
a primary battery connected to the system bus;
a first auxiliary battery module connected to the system bus comprisinga first auxiliary battery,a second auxiliary battery,a bi-directional battery voltage converter,a module controller selectively connecting one of the first auxiliary battery, and the second auxiliary battery to the bi-directional battery voltage converter; and
a main system controller operating the first auxiliary battery module in one ofa null mode, wherein the first auxiliary battery and the second auxiliary battery are disconnected from the electrical system,a charging mode, wherein one of the first auxiliary battery and the second auxiliary battery receives a current via the bi-directional battery voltage converter, anda discharging mode, wherein one of the first auxiliary battery and the second auxiliary battery supplies a current via the bi-directional battery voltage converter,wherein the bi-directional battery voltage converter comprisesan inductor,a first switch selectively coupling the inductor to one of the first auxiliary battery and the second auxiliary battery,a second switch selectively coupling the inductor to one of the first auxiliary battery and the second auxiliary battery,a third switch selectively coupling the inductor to the system bus,a fourth switch selectively coupling the inductor to the system bus, anda routing circuit controlled by the module controller and connected to each of the first, second, third, and fourth switches, the routing circuit controllably directing opening and closing of each of the first switch, the second switch, the third switch, and the fourth switch.
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Abstract
A battery module for use with a vehicle electrical system. The battery module includes a bi-directional battery voltage converter, a first battery, and a second battery. A first relay selectively connects the first battery to the bi-directional battery voltage converter. A second relay selectively connecting the second battery to the bi-directional battery voltage converter. A controller selectively energizes the first relay, selectively energizes the second relay, and controls a direction of current through the bi-directional battery voltage converter.
172 Citations
16 Claims
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1. An electrical system for a vehicle, comprising:
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a system bus; an alternator supplying a current to the system bus when mechanically driven by a prime mover; an ignition switch selecting an operational state of the electrical system; a primary battery connected to the system bus; a first auxiliary battery module connected to the system bus comprising a first auxiliary battery, a second auxiliary battery, a bi-directional battery voltage converter, a module controller selectively connecting one of the first auxiliary battery, and the second auxiliary battery to the bi-directional battery voltage converter; and a main system controller operating the first auxiliary battery module in one of a null mode, wherein the first auxiliary battery and the second auxiliary battery are disconnected from the electrical system, a charging mode, wherein one of the first auxiliary battery and the second auxiliary battery receives a current via the bi-directional battery voltage converter, and a discharging mode, wherein one of the first auxiliary battery and the second auxiliary battery supplies a current via the bi-directional battery voltage converter, wherein the bi-directional battery voltage converter comprises an inductor, a first switch selectively coupling the inductor to one of the first auxiliary battery and the second auxiliary battery, a second switch selectively coupling the inductor to one of the first auxiliary battery and the second auxiliary battery, a third switch selectively coupling the inductor to the system bus, a fourth switch selectively coupling the inductor to the system bus, and a routing circuit controlled by the module controller and connected to each of the first, second, third, and fourth switches, the routing circuit controllably directing opening and closing of each of the first switch, the second switch, the third switch, and the fourth switch. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A battery module for use with a vehicle electrical system, comprising:
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a bi-directional battery voltage converter; a first battery; a second battery; a first relay selectively connecting the first battery to the bi-directional battery voltage converter; a second relay selectively connecting the second battery to the bi-directional battery voltage converter; and a controller selectively energizing the first relay, selectively energizing the second relay, and controlling a direction of current through the bi-directional battery voltage converter, wherein the bi-directional battery voltage converter comprises an inductor, a first switch selectively coupling the inductor to one of the first auxiliary battery and the second auxiliary battery, a second switch selectively coupling the inductor to one of the first auxiliary battery and the second auxiliary 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, and a routing circuit controlled by the controller and connected to each of the first, second, third, and fourth switches, the routing circuit selectively opening and closing each of the first switch, the second switch, the third switch, and the fourth switch, charging the inductor from one of the vehicle electrical system and the battery and discharging the inductor to the other of the vehicle electrical system and the battery. - View Dependent Claims (14, 15, 16)
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Specification