Automatic battery power switch
First Claim
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1. An automatic battery power switch circuit, comprising:
- n+m cells in a battery;
inductor means for determining the current level at which switching occurs;
a first capacitor having a first end connected between a first end of said inductor means and a second end connected to ground;
a second capacitor having a first end connected between a second end of said inductor means and a second end connected to ground; and
switching means for switching between n and n+m cells based on a change in current.
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Abstract
An automatic battery power switch circuit which switches from n to n+m cells, where n and m are integers, in a battery. The circuit delivers a relatively constant voltage over a wide range of load current conditions. One embodiment switches based on load current. Another embodiment switches based on the output voltage of the circuit. The circuit provides a high speed automatic switch used in devices that require at least two power states, that can function as a voltage regulator, and that can significantly prolong functional battery life.
15 Citations
6 Claims
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1. An automatic battery power switch circuit, comprising:
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n+m cells in a battery; inductor means for determining the current level at which switching occurs; a first capacitor having a first end connected between a first end of said inductor means and a second end connected to ground; a second capacitor having a first end connected between a second end of said inductor means and a second end connected to ground; and switching means for switching between n and n+m cells based on a change in current. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification
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Current AssigneeJohns Hopkins University
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Original AssigneeJohns Hopkins University
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InventorsCutchis, Protagoras N.
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Primary Examiner(s)Wong, Peter S.
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Assistant Examiner(s)LUK, LAWRENCE W
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Application NumberUS09/035,278Time in Patent Office592 DaysField of Search320/121, 320/135, 320/120, 429/61, 429/90US Class Current320/121CPC Class CodesH02J 7/36 Arrangements using end-cell...
