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US 5,969,504 AGranted
Automatic battery power switch
AssigneeThe Johns Hopkins University
InventorProtagoras N. Cutchis
Life of this patent
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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.
Claims6
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.
3 more elements
Dependencies are inferred from the claim text.