US3873849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Remote control circuit for constant current regulator
Assignee: General Electric Co
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Filing: 1970-11-04
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Granted: 1975-03-25
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Expires: 1990-11-04
Abstract
Abstract Current regulator device used for lighting circuits to control lamp brightness. A moving coil transformer has a main secondary winding connected to an illuminating load and an auxiliary secondary winding associated with the main secondary winding, and SCR phase control device is connected to the auxiliary secondary winding for controlling the current therein and thereby the current in the main secondary winding and the load. The SCR control device is triggered by a transistor and pulse transformer circuit synchronized with the voltage from the alternating current supply which is rectified by a bridge circuit. A remote control circuit for operating the regulator to produce different brightness levels includes a plurality of parallel-connected transistor circuits having individually adjustable resistors.
Inventors
- 👤 Robert E Babcock
- 👤 Wayne R Neal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:34
CPC Classifications
H; H05; H05B; H05B39/00; H05B39/04; H05B39/041; H05B39/044; G; G05; G05F; G05F1/00; G05F1/10; G05F1/12; G05F1/14; G05F1/16; G05F1/20; G05F1/32; G05F1/34; G05F1/38; Y; Y02; Y02B; Y02B20/00; Y10; Y10S; Y10S323/00; Y10S323/909
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
110 words
Adjustable control device comprising, in combination, a unidirectional current supply, a current control circuit comprising variable resistance means connected to said unidirectional current supply and a transistor connected at its base to said current supply and having its collector connected to said variable resistance means, a charging capacitor connected to the junction of said variable resistance means and said transistor collector and to the emitter of said transistor, said capacitor and said variable resistance meAns forming an RC time constant circuit, and means connected to said transistor for at least partially turning off the same for controlling the operation thereof and thereby the operation of the RC time constant circuit.
Claim 2
Dependent Claim
110 words
Adjustable control device comprising, in combination, a unidirectional current supply, a current control circuit comprising variable resistance means connected to said unidirectional current supply and a transistor connected at its base to said current supply and having its collector connected to said variable resistance means, a charging capacitor connected to the junction of said variable resistance means and said transistor collector and to the emitter of said transistor, said capacitor and said variable resistance meAns forming an RC time constant circuit, and means connected to said transistor for at least partially turning off the same for controlling the operation thereof and thereby the operation of the RC time constant circuit.
Claim 3
Dependent Claim
34 words
A device as defined in claim 1, said last-mentioned means comprising a second unidirectional current supply of polarity opposite that of said first-mentioned unidirectional current supply, and connected to the base of said transistor.
Claim 4
Dependent Claim
25 words
A device as defined in claim 2, and an adjustable resistor connected between said second unidorectional current supply and said transistor base in series therewith.
Claim 5
Dependent Claim
244 words
Adjustable control device comprising, in combination, a unidirectional current supply, a current control circuit comprising variable resistance means connected to said unidirectional current supply and a transistor connected at its base to said current supply and having its collector connected to said variable resistance means, a charging capacitor connected to the junction of said variable resistance means and said transistor collector and to the emitter of said transistor, said capacitor and said variable resistance means forming an RC time constant circuit, and means connected to said transistor for at least partially turning off the same for controlling the operation thereof and thereby the operation of the RC time constant circuit, said last-mentioned means comprising a second unidirectional current supply of polarity opposite that of said first-mentioned unidirectional current supply, and connected to the base of said transistor, an adjustable resistor connected between said second unidirectional current supply and said transistor base in series therewith, and at least another current control circuit comprising a second transistor and a second variable resistance means corresponding to and in parallel with said first-mentioned current control circuit, and a plurality of parallel-connected voltage limiting means of different voltage levels respectively connected to the transistors of the first and second mentioned current control circuits and in series with said adjustable resistor for sequentially turning off the respective transistors upon adjustment of said adjustable resistor, and current blocking means isolating said resistances in the respective current control circuits from each other.
Claim 6
Dependent Claim
244 words
Adjustable control device comprising, in combination, a unidirectional current supply, a current control circuit comprising variable resistance means connected to said unidirectional current supply and a transistor connected at its base to said current supply and having its collector connected to said variable resistance means, a charging capacitor connected to the junction of said variable resistance means and said transistor collector and to the emitter of said transistor, said capacitor and said variable resistance means forming an RC time constant circuit, and means connected to said transistor for at least partially turning off the same for controlling the operation thereof and thereby the operation of the RC time constant circuit, said last-mentioned means comprising a second unidirectional current supply of polarity opposite that of said first-mentioned unidirectional current supply, and connected to the base of said transistor, an adjustable resistor connected between said second unidirectional current supply and said transistor base in series therewith, and at least another current control circuit comprising a second transistor and a second variable resistance means corresponding to and in parallel with said first-mentioned current control circuit, and a plurality of parallel-connected voltage limiting means of different voltage levels respectively connected to the transistors of the first and second mentioned current control circuits and in series with said adjustable resistor for sequentially turning off the respective transistors upon adjustment of said adjustable resistor, and current blocking means isolating said resistances in the respective current control circuits from each other.
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) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |