Patent US3969665A successfully refreshed from Google Patents.
US3969665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic control circuit for battery charging systems
Assignee: Schauer Manufacturing Corp
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Filing: 1974-12-23
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Granted: 1976-07-13
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Expires: 1994-12-23
Abstract
Abstract The utilization of a pilot SCR in the control circuitry adapted to trigger a pair of SCRs in the power circuit of a battery charging system to maintain automatic off-on control of the system at full battery charged capacity whenever the battery voltage is or falls below its fully charged condition.
Inventors
- 👤 Clifford A. Rowas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:13
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/90; H02J7/971; H02J7/975
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
300 words
A storage battery charging system comprising: a transformer having a primary winding connected at its ends to a source of alternating current, and a secondary winding having output leads, a first full wave rectifier means connected to the output leads of the secondary winding; said first full wave rectifier means having a pair of direct current output leads connected to the terminals of a storage battery, and which includes a pair of gate controlled rectifiers each interposed in an output lead of the secondary winding, a unijunction relaxation oscillator circuit, a pilot controlled rectifier, a second full wave rectified control circuit connected to the output leads of the secondary winding and consisting of a pair of diodes having their anodes connected to the output leads of the transformer secondary winding and their cathodes electrically connected together, the connected cathodes of said diodes being connected to the anode of the pilot gate controlled rectifier, and the cathode of said pilot gate controlled rectifier being connected to the gates of the pair of gate controlled rectifiers in the said first full wave rectifier means, said unijunction relaxation oscillator circuit being connected across the output terminals of the first full wave rectifier and having a voltage output conduction capacitance coupled to the gate of the pilot gate controlled rectifier, said oscillator circuit including a thermistor in series with a potentiometer and adapted to sense the battery voltage and trigger the pilot gate controlled rectifier when said voltage is or decays below a predetermined full charge, said gate controlled rectifier triggering the pair of gate controlled rectifiers to initiate and maintain the battery charging control of the system and also render the pilot gate controlled rectifier non-conductive to turn off the pair of gate controlled rectifiers when the battery has attained a predetermined charge.
Claim 2
Dependent Claim
300 words
A storage battery charging system comprising: a transformer having a primary winding connected at its ends to a source of alternating current, and a secondary winding having output leads, a first full wave rectifier means connected to the output leads of the secondary winding; said first full wave rectifier means having a pair of direct current output leads connected to the terminals of a storage battery, and which includes a pair of gate controlled rectifiers each interposed in an output lead of the secondary winding, a unijunction relaxation oscillator circuit, a pilot controlled rectifier, a second full wave rectified control circuit connected to the output leads of the secondary winding and consisting of a pair of diodes having their anodes connected to the output leads of the transformer secondary winding and their cathodes electrically connected together, the connected cathodes of said diodes being connected to the anode of the pilot gate controlled rectifier, and the cathode of said pilot gate controlled rectifier being connected to the gates of the pair of gate controlled rectifiers in the said first full wave rectifier means, said unijunction relaxation oscillator circuit being connected across the output terminals of the first full wave rectifier and having a voltage output conduction capacitance coupled to the gate of the pilot gate controlled rectifier, said oscillator circuit including a thermistor in series with a potentiometer and adapted to sense the battery voltage and trigger the pilot gate controlled rectifier when said voltage is or decays below a predetermined full charge, said gate controlled rectifier triggering the pair of gate controlled rectifiers to initiate and maintain the battery charging control of the system and also render the pilot gate controlled rectifier non-conductive to turn off the pair of gate controlled rectifiers when the battery has attained a predetermined charge.
Claim 3
Dependent Claim
24 words
The storage battery charging system as set forth in claim 1 wherein the thermistor is remotely positioned with respect to the battery charging system.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-13 | 1980-01-12 | 1980-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-13 | 1984-01-12 | 1984-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-13 | 1988-01-12 | 1988-07-13 | $7700.00 | Window Closed / Lapsed |