Power supply for a pulsed load
First Claim
1. An energy storage device for supplying a load with a pulsed load profile, the device including:
- a battery having a predetermined internal resistance R and two terminals for allowing electrical connection to the battery; and
a supercapacitor connected in parallel with the terminals and having a predetermined equivalent series resistance ESR, wherein ESR<
0.25.R and a capacitance provided by the supercapacitor is sufficient to limit the battery current to a predetermined maximum.
3 Assignments
0 Petitions
Accused Products
Abstract
A power supply (1) for a pulsed load (2) includes a first energy storage device in the form of a battery (3) which is in parallel with a second energy storage device in the form of a supercapacitor (4). Battery (3) and supercapacitor (4) are respectively modelled as:
an ideal battery (7) in series with an internal resistance (8); and
an ideal capacitor (9) in series with an equivalent series resistance (ESR) (10).
Through use of a supercapacitor (4) having a low ESR with respect to the resistance (8), the power supply (1) facilitates continuity of supply to load (2). That is, during peak demand more of the load current will be supplied by supercapacitor (4) due to the lower ESR. Moreover, during times of lower load current demands the battery recharges the supercapacitor. This reduces the peak current needed to be provided by the battery and thereby improves battery longevity.
56 Citations
18 Claims
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1. An energy storage device for supplying a load with a pulsed load profile, the device including:
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a battery having a predetermined internal resistance R and two terminals for allowing electrical connection to the battery; and
a supercapacitor connected in parallel with the terminals and having a predetermined equivalent series resistance ESR, wherein ESR<
0.25.R and a capacitance provided by the supercapacitor is sufficient to limit the battery current to a predetermined maximum.- View Dependent Claims (2, 3, 4, 5)
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6. An energy storage device for supplying a load with a pulsed load profile, the device including:
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a battery for providing a battery current and having two terminals for electrically connecting with a load; and
a supercapacitor connected in parallel with the terminals and having a predetermined capacitance that, in use, independently limits the battery current to a predetermined threshold.
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7. A power supply including:
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a battery having two terminals for electrically connecting with a load that demands a pulsed current; and
a supercapacitor connected in parallel with the terminals wherein a capacitance of the supercapacitor is sufficient to maintain the ratio of the range of instantaneous power provided by the battery and the average value of the power provided by the battery at less than a predetermined threshold. - View Dependent Claims (8)
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9. An energy storage device including:
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a battery having two terminals for electrically connecting with a load that demands a pulsed current; and
a supercapacitor connected in parallel with the terminals and having a capacitance sufficient to maintain the ratio of the range of instantaneous power provided by the battery and the average value of the power provided by the battery at less than a predetermined threshold. - View Dependent Claims (10)
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11. An energy storage device for supplying a load with a pulsed load profile, the device including:
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a battery having a predetermined internal resistance R and two terminals for allowing electrical connection to the battery; and
a supercapacitor connected in parallel with the terminals for independently limiting the battery current to a predetermined maximum, the supercapacitor having a predetermined equivalent resistance ESR and a capacitance C, wherein ESR<
0.5R and C is less than 1 Farad.
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12. An energy storage device for supplying a load with a pulsed load profile, the device including:
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a battery having a predetermined internal resistance R and two terminals for allowing electrical connection to the battery; and
a supercapacitor connected in parallel with the terminals for independently limiting the battery current to a predetermined maximum, the supercapacitor having a predetermined equivalent series resistance ESR, wherein ESR<
110 mOhms<
R.- View Dependent Claims (13, 14)
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15. An energy storage device for supplying a load with a pulsed load profile, the device including:
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a battery having a predetermined internal resistance R and two terminals for allowing electrical connection to the battery; and
a supercapacitor connected in parallel with the terminals for independently limiting the battery current to a predetermined maximum, the supercapacitor having a predetermined equivalent series resistance ESR, a predetermined volume V and a predetermined capacitance C, where ESR<
0.5.R, V<
13 cm3 and C>
1 Farad.
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16. An energy storage device for supplying a load with a pulsed load profile, the device including:
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a battery having two terminals for allowing electrical connection to the battery; and
a supercapacitor for independently limiting the battery current to a predetermined maximum, the supercapacitor having a plurality of serial connected supercapacitor cells for connecting in parallel with the terminals, wherein the supercapacitor cells have an operating voltage of at least 2.3 Volts and the supercapacitor has a predetermined equivalent series resistance ESR of less than about 20 mOhms. - View Dependent Claims (17)
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18. An energy storage device for supplying a load with a pulsed load profile, the device including:
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a battery having two terminals for allowing electrical connection to the battery; and
a supercapacitor for independently limiting the battery current to a predetermined maximum, the supercapacitor having a plurality of serial connected supercapacitor cells for connecting in parallel with the terminals, wherein the supercapacitor cells have an operating voltage of at least 2.3 Volts and the supercapacitor has a predetermined capacitance of greater than about 1.9 Farads.
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Specification