US Patent: 6,262,560
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| Battery Pack Discharge Recovery Circuit
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Patentees:
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| Daniel D. Lionberg (exact or similar names) - Milwaukee, WI |
| Thomas P. Becker (exact or similar names) - Kenosha, WI |
| Daniel M. Eggert (exact or similar names) - Kenosha, WI |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jul. 17, 2000 |
| Granted: |
Jul. 17, 2001 |
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Stan Schulz
Snap-On Tools Company History
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Description: |
| Seyfarth & Shaw - patent attorneys
Abstract
A charging circuit for a lead-acid battery pack includes a sacrificial battery with a voltage less than that required to charge the lead-acid battery and connected across the input terminals of a power converter, which boosts the sacrificial battery voltage to an output voltage sufficient to charge the battery pack. A processor operating under stored program control is connected across the lead-acid battery and monitors its voltage and produces an output signal when the voltage drops below a predetermined level, for triggering the power converter to apply its boosted voltage to the lead-acid battery for charging. The processor program ignores normal battery voltage conditions which occur during normal operation of an associated device powered by the lead-acid battery and will activate the power converter only when the lead-acid battery voltage has reached a significantly low level or has reached a low level for a sufficiently long period of time, to be consistent with a deep discharge condition of the lead-acid battery.
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