US3585485A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Novel integral firing angle control for converters
Assignee: Westinghouse Electric Corp
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Filing: 1969-06-20
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Granted: 1971-06-15
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Expires: 1989-06-20
Abstract
Abstract An improved method of firing angle control of thyristor type converters and particularly cycloconverters each of the component waveforms of the converter as well as the composite output waveform of the converter are summed with a reference waveform and the difference resulting from each of the summations is integrated. The firing angles of the thyristors are established when a predetermined relationship exists between the integral corresponding to the composite output waveform and the integrals corresponding to the component waveforms. A system of control is employed wherein the firing points are determined as a function of the integral of the converter output waveform.
Inventors
- 👤 Laszlo Gyugyi
- 👤 John Rosa
- 👤 Brian R Pelly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:49
CPC Classifications
H; H02; H02M; H02M5/00; H02M5/02; H02M5/04; H02M5/22; H02M5/25; H02M5/27; H02M5/271
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
149 words
A method for generating an output waveform of a converter circuit including an essentially sinusoidal AC input voltage source, a reference voltage source, and switching means operated by firing pulses to generate numerous component waveforms, a composite of which forms the converter output waveform, comprising the steps, of, firstly summing the component waveforms and the reference voltage waveform to generate signals corresponding to the differences between said component waveforms and said reference waveform, secondly summing the converter input waveform and said reference waveform to generate a signal corresponding to the difference between said converter output waveform and said reference waveform, determining the average value of said signals corresponding to said differences, comparing the average value of the signals corresponding to the first sunning step to the average value of the signal corresponding to the second summing step, and generating firing pulses when predetermined relationships exist between said average values.
Claim 2
Independent Claim
149 words
A method for generating an output waveform of a converter circuit including an essentially sinusoidal AC input voltage source, a reference voltage source, and switching means operated by firing pulses to generate numerous component waveforms, a composite of which forms the converter output waveform, comprising the steps, of, firstly summing the component waveforms and the reference voltage waveform to generate signals corresponding to the differences between said component waveforms and said reference waveform, secondly summing the converter input waveform and said reference waveform to generate a signal corresponding to the difference between said converter output waveform and said reference waveform, determining the average value of said signals corresponding to said differences, comparing the average value of the signals corresponding to the first sunning step to the average value of the signal corresponding to the second summing step, and generating firing pulses when predetermined relationships exist between said average values.
Claim 3
Dependent Claim
15 words
A method as claimed in claim 1 wherein said average values are obtained by integration.
Claim 4
Dependent Claim
22 words
A method as claimed in claim 1 wherein the average value of the converter output waveform is determinded between successive firing pulses.
Claim 5
Dependent Claim
145 words
A converter circuit including an essentially sinusoidal AC input voltage source, a reference voltage source switching means operated by firing pulses to generate numerous component waveforms, a composite of which forms the converter output waveform, first means for summing the component waveforms and the reference waveform to generate signals corresponding to the differences between said component waveforms and said reference waveform, second means for summing the converter output waveform and said reference waveform to generate signal corresponding to the differEnce between said converter output waveform and said reference waveform, third means for when said determining the average value of said signals corresponding to said differences, and fourth means for comparing the average value of the signals corresponding to the first means to the average value of the signal corresponding to the second means and generating firing pulses when predetermined relationships exist between said average values.
Claim 6
Dependent Claim
145 words
A converter circuit including an essentially sinusoidal AC input voltage source, a reference voltage source switching means operated by firing pulses to generate numerous component waveforms, a composite of which forms the converter output waveform, first means for summing the component waveforms and the reference waveform to generate signals corresponding to the differences between said component waveforms and said reference waveform, second means for summing the converter output waveform and said reference waveform to generate signal corresponding to the differEnce between said converter output waveform and said reference waveform, third means for when said determining the average value of said signals corresponding to said differences, and fourth means for comparing the average value of the signals corresponding to the first means to the average value of the signal corresponding to the second means and generating firing pulses when predetermined relationships exist between said average values.
Claim 7
Dependent Claim
23 words
A converter circuit as claimed in claim 4 wherein said third means for determining the average value of said differences are integrator circuits.
Claim 8
Dependent Claim
16 words
A converter circuit as claimed in claim 4 wherein said fourth means includes a comparator circuit.
Claim 9
Dependent Claim
17 words
A converter circuit as claimed in claim 4 wherein said fourth means includes a firing pulse generator.
Claim 10
Dependent Claim
127 words
A converter circuit wherein the phase, frequency and amplitude of the output is controlled as a function of a reference waveform, comprising, switching means responsive to a control signal for controlling the output waveform of said converter, means operatively coupled to a source of said reference waveform and to said switching mean for summing said reference waveform with the converter output waveform, an integrator circuit means having an input coupled to the output of said summing means for generating said control signal when a predetermined relationship exits between the average value of the reference waveform and the average value of the converter output waveform, and means for controlling said switching means in response to said control signal, said switching means comprised of multiple sets of switching elements.
Claim 11
Dependent Claim
127 words
A converter circuit wherein the phase, frequency and amplitude of the output is controlled as a function of a reference waveform, comprising, switching means responsive to a control signal for controlling the output waveform of said converter, means operatively coupled to a source of said reference waveform and to said switching mean for summing said reference waveform with the converter output waveform, an integrator circuit means having an input coupled to the output of said summing means for generating said control signal when a predetermined relationship exits between the average value of the reference waveform and the average value of the converter output waveform, and means for controlling said switching means in response to said control signal, said switching means comprised of multiple sets of switching elements.
Claim 12
Dependent Claim
43 words
A converter circuit as claimed in claim 8 wherein the output waveform of said converter is connected additively with the output waveform of said reference source successively through an integrator circuit, a comparator circuit and the control means associated with said switching means.
Claim 13
Dependent Claim
36 words
A converter circuit as claimed in claim 8 wherein said converter output waveform is comprised of a plurality of component waveforms, wherein said component waveforms correspond to the output of said multiple sets of switching elements.
Claim 14
Dependent Claim
46 words
A converter circuit as claimed in claim 9 wherein said control means comprises a plurality of control elements, the output to one of said control elements connected to control one set of said switching elements to control the activation of the switching elements of said set.
Claim 15
Dependent Claim
22 words
A converter circuit as claimed in claim 11 wherein each set of said switching elements comprises a plurality of controlled rectifier elements.
Claim 16
Dependent Claim
46 words
A converter circuit as claimed in claim 12 wherein each of said control elements is a ring counter circuit and the outputs of said ring counter circuits are connected to a set of rectifier elements through individual firing circuits associated with each of said controlled rectifiers.
Claim 17
Dependent Claim
148 words
A converter circuit as claimed in claim 12 including summing circuit means for combining said reference waveform with said converter output waveform and with each of said component waveforms, and generating output signals corresponding to the difference between said reference waveform and said converter output waveform a well as generating output signals corresponding to the difference between said reference waveform and each to said component waveforms, said integrator circuit means being operatively connected to the outputs of said summing circuit means for generating output signals corresponding to the average value of the output signals of said summing circuit means, and including comparator circuit means responsive to said average value output signals for generating control signals to each of said sets of switching elements when a predetermined relationship exists between the average value corresponding to the converter output waveform and the average values corresponding to the respectively component waveforms.
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) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |