Power source switchover apparatus and method
First Claim
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1. A battery-switching apparatus for switching between at least a first battery and a second battery, comprising:
- a first battery compartment operative to house a first battery and having a first positive terminal and a first negative terminal;
a second battery compartment operative to house a second battery and having a second positive terminal and a second negative terminal;
a single boost converter connected to each of the first and second battery compartments;
whereinthe boost converter is operative to draw power from one of the first and second battery compartments having the highest voltage;
a first capacitor, wherein the first capacitor is enabled when a voltage of the first battery exceeds a voltage of the second battery; and
a second capacitor, wherein the second capacitor is enabled when a voltage of the second battery exceeds a voltage of the first battery;
the first positive terminal of the first battery compartment is connected directly to a first common node;
the second positive terminal of the second battery compartment is connected directly to the first common node;
the first negative terminal of the first battery compartment is connected to a first input of a comparator through a second common node; and
the second negative terminal of the second battery compartment is connected to a second input of the comparator through a third common node.
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Abstract
An apparatus for switching from a first power supply to a second power supply. The embodiment may detect the charge or voltage of both the first and second power supply, and power a device from the power supply having the greatest voltage or charge. A single boost converter is used regardless of which power supply is providing power.
183 Citations
25 Claims
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1. A battery-switching apparatus for switching between at least a first battery and a second battery, comprising:
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a first battery compartment operative to house a first battery and having a first positive terminal and a first negative terminal; a second battery compartment operative to house a second battery and having a second positive terminal and a second negative terminal; a single boost converter connected to each of the first and second battery compartments;
whereinthe boost converter is operative to draw power from one of the first and second battery compartments having the highest voltage; a first capacitor, wherein the first capacitor is enabled when a voltage of the first battery exceeds a voltage of the second battery; and a second capacitor, wherein the second capacitor is enabled when a voltage of the second battery exceeds a voltage of the first battery; the first positive terminal of the first battery compartment is connected directly to a first common node; the second positive terminal of the second battery compartment is connected directly to the first common node; the first negative terminal of the first battery compartment is connected to a first input of a comparator through a second common node; and the second negative terminal of the second battery compartment is connected to a second input of the comparator through a third common node. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 25)
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16. A method for switching between at least a first battery and a second battery, comprising:
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detecting a first voltage across the first battery; detecting a second voltage across the second battery; determining which of the first voltage and second voltage is greatest, further comprising; enabling a first capacitor and disabling a second capacitor in the event the first voltage exceeds the second voltage, wherein the operation of disabling the second capacitor comprises; enabling a third capacitor; and employing an output of the third capacitor to disable the second capacitor; disabling the first capacitor and enabling the second capacitor in the event the second voltage exceeds the first voltage; and in response to determining which of the first voltage and second voltage is greatest, supplying power from the greatest voltage to a single boost converter. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24)
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Specification