US3596170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit for regulating peak values of an ac wave
Assignee: Tektronix Inc
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Filing: 1969-09-12
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Granted: 1971-07-27
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Expires: 1989-09-12
Abstract
Abstract A peak-to-peak regulator is coupled in series between an AC power source and the primary of an AC transformer. Another winding on the same transformer is employed to detect when peak values of the AC wave exceed a predetermined value, and negative feedback in response thereto increases the impedance of the regulator. Positive feedback circuitry is included which detects an increase in voltage drop across the regulator and which in response thereto further enhances or aids the negative feedback. As a result, the current through the regulator is minimized for the duration of the peak of the AC wave which it regulates.
Inventors
- 👤 Hiro Moriyasu
- 👤 Hideki Iwata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:22
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/12; G05F1/40; G05F1/44; G05F1/445
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
156 words
A circuit for regulating peak values of an AC wave as delivered on an AC line from a supply, said circuit comprising: a variable impedance control means coupled in series with said line, said control means comprising principal terminals coupled to said line and a control element adapted to vary the impedance between said principal terminals, a means for sensing voltage peaks of said AC wave on said line beyond said control means, negative feedback means for coupling a sensing signal from said means for sensing to said control element for increasing the impedance of said control means as said peaks exceed a predetermined value, and positive feedback means coupled to aid said negative feedback means for effectively increasing the impedance change initiated by said sensing signal substantially for the duration of the period during which a said peak exceeds said predetermined value, so as to reduce the current in said control means during that time.
Claim 2
Dependent Claim
156 words
A circuit for regulating peak values of an AC wave as delivered on an AC line from a supply, said circuit comprising: a variable impedance control means coupled in series with said line, said control means comprising principal terminals coupled to said line and a control element adapted to vary the impedance between said principal terminals, a means for sensing voltage peaks of said AC wave on said line beyond said control means, negative feedback means for coupling a sensing signal from said means for sensing to said control element for increasing the impedance of said control means as said peaks exceed a predetermined value, and positive feedback means coupled to aid said negative feedback means for effectively increasing the impedance change initiated by said sensing signal substantially for the duration of the period during which a said peak exceeds said predetermined value, so as to reduce the current in said control means during that time.
Claim 3
Dependent Claim
38 words
The circuit according to claim 1 wherein said variable impedance control means comprises a unilaterally conducting control device, said circuit further including a bridge rectifier coupling the principal terminals of said control device in series with said line.
Claim 4
Dependent Claim
24 words
The circuit according to claim 2 wherein said control device comprises a transistor having its collector and emitter terminals connected to said bridge rectifier.
Claim 5
Dependent Claim
86 words
The circuit according to claim 2 further including a transformer having an input winding coupled to said line beyond said control means, said transformer having an output winding, and said means for sensing voltage peaks comprising a sensing winding on said transformer and comparison circuit means for detecting when the voltage on the last-mentioned winding exceeds a predetermined value, said negative feedback means including amplifying means driving said control device for increasing the impedance thereof when the voltage on the sensing winding exceeds a predetermined value.
Claim 6
Dependent Claim
45 words
The circuit according to claim 4 wherein said positive feedback means includes a further amplifying means coupled to detect the voltage across said control device and for increasing the negative feedback provided by said negative feedback means as the voltage across said control device increases.
Claim 7
Dependent Claim
56 words
The circuit according to claim 1 wherein said positive feedback means comprises a further control means coupled to sense the voltage across said variable impedance control means and in response thereto providing an output for application to said negative feedback means for causing said negative feedback means further to increase the impedance of said control means.
Claim 8
Dependent Claim
146 words
A circuit for regulating peak values of an AC wave as delivered on an AC line from a supply, said circuit comprising: a series control device provided with principal terminals and a control terminal, rectifier means for coupling said line to said principal terminals of said control deviCe, sensing means for detecting the voltage across said line beyond said rectifier means, negative feedback means responsive to said sensing means for increasing the voltage across said control device as the peaks of the AC wave exceed a predetermined value, said negative feedback means comprising an amplifier circuit, and positive feedback means responsive to increases in the voltage across said control device and in response thereto increasing an input to said amplifier circuit whereby further to increase the voltage across said control device for the duration of the period during which the AC wave exceeds a predetermined value.
Claim 9
Dependent Claim
146 words
A circuit for regulating peak values of an AC wave as delivered on an AC line from a supply, said circuit comprising: a series control device provided with principal terminals and a control terminal, rectifier means for coupling said line to said principal terminals of said control deviCe, sensing means for detecting the voltage across said line beyond said rectifier means, negative feedback means responsive to said sensing means for increasing the voltage across said control device as the peaks of the AC wave exceed a predetermined value, said negative feedback means comprising an amplifier circuit, and positive feedback means responsive to increases in the voltage across said control device and in response thereto increasing an input to said amplifier circuit whereby further to increase the voltage across said control device for the duration of the period during which the AC wave exceeds a predetermined value.
Claim 10
Dependent Claim
33 words
The circuit according to claim 7 wherein said control device comprises a transistor, wherein said amplifier circuit comprises a first transistor amplifier, and wherein said positive feedback means comprises a further transistor amplifier.
Claim 11
Dependent Claim
47 words
The circuit according to claim 8 wherein said sensing means includes comparison means comprising a Zener diode coupled to one terminal of a transistor in said first transistor amplifier, another terminal of the same transistor being coupled to receive a signal substantially proportional to the AC wave.
Claim 12
Dependent Claim
57 words
The circuit according to claim 9 further including a transformer having a primary winding coupled to said line beyond said control device, said sensing means including a further winding on said transformer being coupled to an input of said amplifier circuit and rectification means between the said last mentioned winding and the input of said amplifier circuit.
Claim 13
Dependent Claim
29 words
The circuit according to claim 10 wherein said further winding and said rectification means are also connected to provide power for at least a portion of said amplifier circuit.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |