Energy Source System Having Multiple Energy Storage Devices
First Claim
1. An energy source system, comprising:
- an energy storage device configured to store and release energy;
an ultracapacitor;
a first switching device coupled to the energy storage device and configured to selectively connect and disconnect the energy storage device to a load;
a second switching device coupled to the ultracapacitor and configured to selectively connect and disconnect the ultracapacitor to the load; and
a current sensor configured to sense the current draw at the load, wherein the first switching device is configured to be activated to connect the energy storage device to the load when a rate of change of the current draw at the load is below a preset threshold and the second switching device is configured to be activated to connect the ultracapacitor to the load when the rate of change of the current draw at the load is greater than or equal to the preset threshold.
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Accused Products
Abstract
System are described that include an energy storage device adapted to store and release energy and an ultracapacitor. The systems include a switching device coupled to the energy storage device to selectively connect and disconnect the energy storage device to a load, and a second switching device coupled to the ultracapacitor and adapted to connect and disconnect the ultracapacitor to the load. The systems may include a sensor adapted to sense the current draw at the load. The first switching device is activated to connect the energy storage device to the load when a rate of change of the current draw at the load is below a threshold, and the second switching device is activated to connect the ultracapacitor to the load when the rate of change of the current draw at the load is greater than or equal to the threshold.
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Citations
20 Claims
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1. An energy source system, comprising:
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an energy storage device configured to store and release energy; an ultracapacitor; a first switching device coupled to the energy storage device and configured to selectively connect and disconnect the energy storage device to a load; a second switching device coupled to the ultracapacitor and configured to selectively connect and disconnect the ultracapacitor to the load; and a current sensor configured to sense the current draw at the load, wherein the first switching device is configured to be activated to connect the energy storage device to the load when a rate of change of the current draw at the load is below a preset threshold and the second switching device is configured to be activated to connect the ultracapacitor to the load when the rate of change of the current draw at the load is greater than or equal to the preset threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for controlling an energy source system, comprising:
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monitoring a parameter corresponding to a demand present at a load; determining, based on a rate of change of the monitored parameter over time, whether the rate of change of the monitored parameter is greater than or equal to a preset threshold; controlling a first switch to couple a battery to the load when the rate of change of the monitored parameter is not greater than or equal to the preset threshold; and controlling a second switch to couple an ultracapacitor to the load when the rate of change of the monitored parameter is greater than or equal to the preset threshold. - View Dependent Claims (10, 11, 12)
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13. An energy source system, comprising:
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an energy storage device configured to store and release energy; an ultracapacitor; a first switching device coupled to the energy storage device and configured to selectively connect and disconnect the energy storage device to a load; a second switching device coupled to the ultracapacitor and configured to selectively connect and disconnect the ultracapacitor to the load; a direct current to direct current (DC-DC) converter configured to electrically couple the energy storage device to the ultracapacitor; a controller coupled to the first switching device, the second switching device and the DC-DC converter; a current sensor configured to sense the current draw at the load; the first switching device configured to be activated to connect the energy storage device to the load when a rate of change of the current draw at the load is below a preset threshold; the second switching device configured to be activated to connect the ultracapacitor to the load when the rate of change of the current draw at the load is greater than or equal to the preset threshold; and the controller configured to determine a desired energy flow to the load when the rate of change of the current draw at the load is greater than or equal to the preset threshold and configured to control the first switching device, the second switching device and the DC-DC converter to achieve the determined energy flow. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification