US3820109A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cycloconverter interface apparatus
Assignee: General Electric Co
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Filing: 1972-01-19
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Granted: 1974-06-25
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Expires: 1992-01-19
Abstract
Abstract A conversion circuit having polarity sensing wherein an input signal is converted into two signals each of which is the inverse of the other. A pair of switches, arranged to conduct these signals selectively, are connected to an integrator which accumulates the voltage of these signals within predetermined limits set by a pair of comparators. Control logic between the comparators and the switches, together with a third comparator producing a binary signal in response to polarity changes of the input signal, cause alternate conduction of the signals and produce a square wave pulse train having a pulse rate proportional to the absolute magnitude of the input signal.
Inventors
- 👤 C Konrad
- 👤 B Chausse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:27
CPC Classifications
H; H03; H03K; H03K19/00; H03K19/02; H03K19/173; G; G01; G01R; G01R19/00; G01R19/18; G01R19/25; G01R19/252; H03K7/00; H03K7/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
214 words
A cycloconverter interface circuit having an input signal of varying amplitude and polarity, comprising: a. means for scaling the input signal and converting said scaled signal into first and second gate signals of equal amplitude and of opposite polarity; b. first and second switching means for selectively conducting respectively said first and second gate signals; c. an integrator connected to the output of said first and second switching means for producing an alternating voltage signal which is the time-integral of the gate signal appliedd thereto; d. means responsive to the output of said integrator for producing a first switching signal each time said alternating voltage signal has reached a predetermined positive value and a second switching signal each time said alternating voltage signal has reached a predetermined negative value; and e. logic means responsive to said first and second switching signals to selectively actuate said first and second switching means to reverse the gate signal polarity applied to said integrator and further responsive to a change in polarity of the input signal to actuate said switching means to change the gate signal applied to said integrator when either of said switching signals is present to produce a square wave pulse train having a pulse rate proportional to the absolute magnitude of the input signal.
Claim 2
Dependent Claim
214 words
A cycloconverter interface circuit having an input signal of varying amplitude and polarity, comprising: a. means for scaling the input signal and converting said scaled signal into first and second gate signals of equal amplitude and of opposite polarity; b. first and second switching means for selectively conducting respectively said first and second gate signals; c. an integrator connected to the output of said first and second switching means for producing an alternating voltage signal which is the time-integral of the gate signal appliedd thereto; d. means responsive to the output of said integrator for producing a first switching signal each time said alternating voltage signal has reached a predetermined positive value and a second switching signal each time said alternating voltage signal has reached a predetermined negative value; and e. logic means responsive to said first and second switching signals to selectively actuate said first and second switching means to reverse the gate signal polarity applied to said integrator and further responsive to a change in polarity of the input signal to actuate said switching means to change the gate signal applied to said integrator when either of said switching signals is present to produce a square wave pulse train having a pulse rate proportional to the absolute magnitude of the input signal.
Claim 3
Dependent Claim
41 words
The invention claimed in claim 1 wherein said scaling and converting means comprises first and second operational amplifiers connected in series and in which said second operational amplifier has unity gain and inverts the output signal of said first operational amplifier.
Claim 4
Dependent Claim
14 words
The invention claimed in claim 1 wherein said switching means comprises solid state control.
Claim 5
Dependent Claim
17 words
The invention claimed in claim 3 wherein said switching means includes a pair of field effect transistors.
Claim 6
Dependent Claim
22 words
The invention claimed in claim 1 wherein said means responsive to the output of the integrator comprises a pair of comparator circuits.
Claim 7
Dependent Claim
26 words
The invention claimed in claim 5 wherein the comparator circuits compare the output of said integrator to the voltages set by a pair of Zener diodes.
Claim 8
Dependent Claim
35 words
The invention claimed in claim 6 wherein said Zener diodes are connected such that one provides a positive voltage level and the other provides a negative level of voltage for comparison by said comparator circuits.
Claim 9
Dependent Claim
76 words
The invention claimed in claim 1 wherein said logic means includes a plurality of interconnected logic function circuits operable, when said input signal is of a first polarity, to render said first and second switching means conductive in response, respectively, to said first and second switching signals and to render, when said input signal is of a second polarity, said first and second switching means conductive in response, respectively, to said second and first switching signals.
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) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |