Automatic varying rate battery charger utilizing transistor latching means in voltage sensing circuit
Abstract
Abstract AN AUTOMATIC VARYING RATE BATTERY CHARGING CIRCUIT INCLUDING A SILICON-CONTROLLED RECTIFIER, THE CONDUCTION OF WHICH IS EFFECTIVELY DETERMINED BY THE VOLTAGE LEVEL OF THE BATTERY. THE CIRCUITRY COMPRISES A VOLTAGE DIVIDING NETWORK AND A TRANSISTOR HAVING ITS EMITTER AND COLLECTOR ELECTRODE SHUNTED ACROSS A RESISTOR OF THE VOLTAGE DIVIDING NETWORK TO INSURE THE CONDUCTION OF THE CONTROLLED RECTIFIER. A ZENER DIODE CONNECTED AT ITS CATHODE TO THE VOLTAGE DIVIDING NETWORK ITS USED TO INSURE, THROUGH A SECOND CONTROLLED RECTIFIER, THE TAPERING OF A HIGH CHARGE CURRENT APPLIED BY THE CIRCUIT TO THE BATTERY WHEN THE BATTERY REACHES A POINT OF GASSING. AT A MAXIMUM CHARGE VOLTAGE LEVEL OF THE BATTERY, THE FULL CONDUCTION OF THE ZENER DIODE CAUSES, THROUGH THE SECOND CONTROLLED RECTIFIER, THE COMPLETE CUT-OFF OF THE HIGH CHARGE CURRENT. A LOW OR TRICKLE CHARGE CURRENT IS SUPPLIED TO THE BATTERY THROUGH A SERIES CONNECTED RESISTOR DIODE WHEN THE HIGH CHARGE CURRENT HAS BEEN CUT OFF.
Inventors
- 👤 John C Lesher
Bibliographic Details
Claims Analysis
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |