US3723854A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit for compensating for line drop between power source and load circuit
Assignee: New Nippon Electric Co Ltd
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Filing: 1971-08-09
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Granted: 1973-03-27
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Expires: 1991-08-09
Abstract
Abstract A load is energized from an alternating current source by way of a conduction angle control circuit controlled by a phase control circuit. A detected signal proportional to the load current is positively fed back to the conduction angle control circuit to automatically compensate for the voltage drops in the power feed path for the load. A protecting circuit may be connected to generate a negative signal when the supply voltage exceeds a determined value with respect to the normal load current due to the capacity of the load.
Inventors
- 👤 H Kita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:47
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/12; G05F1/40; G05F1/44; G05F1/45; G05F1/455
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
158 words
A system for regulating the energization of a load from an alternating current supply source, wherein said supply source is connected to said load through a current control device and a feedpath having a substantial resistance in that order, said system comprising conduction angle control means connected to said control device for controlling current applied to said load, a control current source, means coupled to said feedpath for deriving a signal proportional to said load current, means for applying the sum of said control current and said derived signal to said conduction angle control means for controlling said current, said signal being applied to said control means in the positive feedback sense whereby said current is increased in a sense to compensate for voltage drops in said feedpath, and means connected to said means for deriving said signal for adding an opposing signal to the output of said signal deriving means when said current exceeds a given magnitude.
Claim 2
Independent Claim
158 words
A system for regulating the energization of a load from an alternating current supply source, wherein said supply source is connected to said load through a current control device and a feedpath having a substantial resistance in that order, said system comprising conduction angle control means connected to said control device for controlling current applied to said load, a control current source, means coupled to said feedpath for deriving a signal proportional to said load current, means for applying the sum of said control current and said derived signal to said conduction angle control means for controlling said current, said signal being applied to said control means in the positive feedback sense whereby said current is increased in a sense to compensate for voltage drops in said feedpath, and means connected to said means for deriving said signal for adding an opposing signal to the output of said signal deriving means when said current exceeds a given magnitude.
Claim 3
Dependent Claim
36 words
The system of claim 1, wherein said means for deriving said signal comprises a single current transformer coupled to said feedpath, and rectifier means coupled to the output of said transformer to produce said derived signal.
Claim 4
Dependent Claim
42 words
The system of claim 2, wherein said means for deriving said signal further comprises a variable resistor connected to the output of said rectifier means for adjusting the amplitude of said signal with respect to the value of resistance of said feedpath.
Claim 5
Dependent Claim
39 words
The system of claim 3, wherein said means for adding an opposing signal further comprises a potentiometer connected between terminals of the output of said rectifier for adjusting the operation point of said means for adding an opposing signal.
Claim 6
Dependent Claim
42 words
The system of claim 2, wherein said means for deriving said signal further comprises a variable resistor connected to the output of said current transformer for adjusting the amplitude of said signal with respect to the value of resistance of said feedpath.
Claim 7
Dependent Claim
39 words
The system of claim 5, wherein said means for adding an opposing signal further comprises a potentiometer connected between terminals of the output of said rectifier for adjusting the operation point of said means for adding an opposing signal.
Claim 8
Dependent Claim
72 words
The system of claim 1, wherein said signal deriving means comprises a single current transformer coupled to said feedpath, rectifier means coupled to the output of said transformer, and a series resistor connected to the output of said rectifier means, and said means for adding an opposing signal comprises a threshold device and an inverter serially connected between the output of said rectifier means and the output of said signal deriving means.
Claim 9
Dependent Claim
18 words
The system of claim 7, further comprising resistor means serially connected with said inverter and said threshold device.
Claim 10
Dependent Claim
65 words
The system according to claim 1, further comprising negative feedback means for controlling variations of supply of current to said load, said negative feedback means producing a signal which is proportional to the alternating current supplied to the load, means for differentially adding said proportional signal to said derived signal from said signal deriving means and to said control current from said control current source.
Claim 11
Dependent Claim
125 words
A dimmer circuit comprising an alternating current source, a lighting load device, conduction angle control means for regulating alternating current to said load device from said alternating current source, power feeding means for said load device, and a feedback circuit having a load current detector for detecting a first signal corresponding to the current of said load device and a second detector for detecting a second signal corresponding to the voltage of said source, said first signal from said load current detector being positively fedback to said conduction angle control means, and said second signal from said second detector being negatively fedback to said conduction angle control means, thereby compensating voltage drops in said power feeding means and controlling illuminant variations in said load device.
Claim 12
Dependent Claim
125 words
A dimmer circuit comprising an alternating current source, a lighting load device, conduction angle control means for regulating alternating current to said load device from said alternating current source, power feeding means for said load device, and a feedback circuit having a load current detector for detecting a first signal corresponding to the current of said load device and a second detector for detecting a second signal corresponding to the voltage of said source, said first signal from said load current detector being positively fedback to said conduction angle control means, and said second signal from said second detector being negatively fedback to said conduction angle control means, thereby compensating voltage drops in said power feeding means and controlling illuminant variations in said load device.
Claim 13
Dependent Claim
53 words
The dimmer circuit according to claim 10, wherein said load current detector includes a current transformer, a rectifier and a resistor the resistance of which is predetermined by said power feeding means, and wherein said second detector includes a rectifier and a transformer for detecting the line voltage of said alternating current source.
Claim 14
Dependent Claim
73 words
The dimmer circuit according to claim 10, wherein said feedback circuit comprises a current transformer having primary and secondary windings, a voltage transformer having primary and secondary windings, said secondary windings being connected in series with each other in the manner of reverse polarity, and wherein a single rectifier is providEd for obtaining a direct current feedback signal from said first and second signals detected by said current transformer and said voltage transformer.
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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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |