Solid state charging circuitry using a loading coil
Abstract
Abstract Self-regulating solid state battery charging circuitry which automatically provides a rippled constant mean fast charge current irrespective of the condition of the battery and automatically changes to a rippled constant mean trickle charge current in response to a near-full-charge battery voltage. On-off triggering of the supply occurs in response to error signals from a current sensing resistance which is in series with the battery and with a low-loss loading coil, the battery receiving current from the energized loading coil through a diode and through the current sensing resistance during off intervals of the supply to thereby achieve high efficiency. Only the frequency and shape of the current ripples change as the battery becomes charged. In response to a near-full-charge battery voltage the current sensing resistance is increased about 10-fold, resulting in a 10fold reduction in charging current and a 10-fold increase in frequency of the current ripples.
Inventors
- 👤 Lawrence A Westhaver
Bibliographic Details
Claims Analysis
Total Claims: 6References Cited (Backward Citations)
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1974-08-30 | 1975-03-01 | 1975-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-30 | 1979-03-01 | 1979-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-30 | 1983-03-01 | 1983-08-31 | $7700.00 | Window Closed / Lapsed |