US3818315A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical converter apparatus having an integrating type control means for determining firing points and an end stop firing pulse control means
Assignee: Westinghouse Electric Corp
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Filing: 1972-11-22
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Granted: 1974-06-18
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Expires: 1992-11-22
Abstract
Abstract In order to prevent reference voltage variations from producing system malfunctions in converters having an integrating type firing pulse control system, an overriding end stop firing pulse control is provided that introduces pulses at prescribed intervals in positive and negative directions to the firing circuits to limit the maximum period within which firing can occur.
Inventors
- 👤 L Gyugyi
- 👤 B Pelly
- 👤 E Stacey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:14
CPC Classifications
H; H02; H02M; H02M5/00; H02M5/02; H02M5/04; H02M5/22; H02M5/25; H02M5/27; H02M5/272
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
193 words
Converter apparatus comprising; an input voltage source; a reference voltage source; switching means interconnected with said sources; and means for generating and applying firing pulses to said switching means to produce from said switching means an output voltage having the waveform of said reference voltage substantially at the power level of the input voltage; said firing pulse means being of the type in which firing points are determined as a function of the integrals of the converter output waveform and the reference voltage waveform; and firing pulse end stop control means for insuring proper operation even when said reference voltage is out of a predetermined operative range, said end stop means comprising means to generate periodic firing pulses independently of the reference voltage and to apply said pulses to said switching means; said firing pulse means comprising a comparator having inputs representative of integrated signals developed from the converteR output waveform and the reference voltage waveform, and said firing pulse end stop control means comprising means for supplying signals to said comparator independently of said reference voltage waveform to generate firing pulses when said reference voltage is outside of a predetermined operative range.
Claim 2
Dependent Claim
193 words
Converter apparatus comprising; an input voltage source; a reference voltage source; switching means interconnected with said sources; and means for generating and applying firing pulses to said switching means to produce from said switching means an output voltage having the waveform of said reference voltage substantially at the power level of the input voltage; said firing pulse means being of the type in which firing points are determined as a function of the integrals of the converter output waveform and the reference voltage waveform; and firing pulse end stop control means for insuring proper operation even when said reference voltage is out of a predetermined operative range, said end stop means comprising means to generate periodic firing pulses independently of the reference voltage and to apply said pulses to said switching means; said firing pulse means comprising a comparator having inputs representative of integrated signals developed from the converteR output waveform and the reference voltage waveform, and said firing pulse end stop control means comprising means for supplying signals to said comparator independently of said reference voltage waveform to generate firing pulses when said reference voltage is outside of a predetermined operative range.
Claim 3
Dependent Claim
99 words
The subject matter of claim 1 wherein: said end stop control means comprises, for each of a plurality of switching elements of said switching means, a transformer having a secondary winding serially connected in circuit with the firing pulse means for said switching means and means connected to the primary of each of said transformers for applying thereto signals resulting in the saturation of said transformers on a periodic phase displaced basis to induce a sequence of positive going and negative going pulses alternately in the secondaries thereof that are supplied to said comparator of said firing pulse means.
Claim 4
Dependent Claim
83 words
The subject matter of claim 2 wherein: said end stop control means further comprises an integrator for each switching element channel to which is applied the converter power waveform and which produces a cosine wave thereof which is applied through resistive impedance means to a null detector along with another signal representative of the condition of another one of the end stop control means of another channel with the output of the null detector supplied to the primary winding of the respective transformer.
Claim 5
Dependent Claim
161 words
A converter circuit, wherein the phase, frequency and amplitude of an output is controlled as a function of a reference waveform, comprising: switching means responsive to a firing pulse to control the output waveform of the converter; an intergrating control circuit for responding upon occurrence of a predetermined relationship between the average value of the reference waveform and the average value of the converter output waveform to initiate a firing pulse; and an end stop firing pulse control circuit supplying signals, developed independently of said reference voltage, to said integrating control circuit to develop firing pulses upon occurrence of a predetermined relationship between said signals from said firing pulse control circuit and other inputs to said integrating control circuit; said integrating control circuit including a comparator having two inputs representative of integrated signals developed from the converter output waveform and the reference voltage waveform and said signals from said end stop firing pulse control circuit are also applied to said comparator.
Claim 6
Dependent Claim
161 words
A converter circuit, wherein the phase, frequency and amplitude of an output is controlled as a function of a reference waveform, comprising: switching means responsive to a firing pulse to control the output waveform of the converter; an intergrating control circuit for responding upon occurrence of a predetermined relationship between the average value of the reference waveform and the average value of the converter output waveform to initiate a firing pulse; and an end stop firing pulse control circuit supplying signals, developed independently of said reference voltage, to said integrating control circuit to develop firing pulses upon occurrence of a predetermined relationship between said signals from said firing pulse control circuit and other inputs to said integrating control circuit; said integrating control circuit including a comparator having two inputs representative of integrated signals developed from the converter output waveform and the reference voltage waveform and said signals from said end stop firing pulse control circuit are also applied to said comparator.
Claim 7
Dependent Claim
52 words
The subject matter of claim 4 wherein: at least said integrating control circuit includes at least one amplifier element subject to saturation upon transient excursions of the reference voltage and said end stop firing pulse control circuit insures generation of firing pulses even while the reference voltage is undergoing a transient excursion.
References Cited (Backward Citations)
US3713012A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |