US3930193A
Expired / Lapsed
US
⏱️ 0.0 years remaining
SCR inverter systems
Assignee: General Electric Co
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Filing: 1973-08-02
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Granted: 1975-12-30
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Expires: 1993-08-02
Abstract
Abstract An A.C. to D.C. to A.C. inverter system including a current controlling element connected between a source of D.C. voltage and an SCR inverter is described. The current controlling element, responsive to various circuit parameters, such as load current, power or instantaneous SCR voltage, maintains the circuit parameters within safe limits. Current controlling elements such as transistors, SCR''s, thermistors, pressure sensitive resistors and other current controlling devices are described.
Inventors
- 👤 William P Kornrumpf
- 👤 Jr John D Harnden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:56
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/02; H02M3/04; H02M3/10; H02M3/145; H02M3/155; H02M3/156; H02M3/158; H02M3/1582; H02M5/00; H02M5/40; H02M5/42; H02M5/44; H02M5/443; H02M5/45; Y; Y02; Y02B; Y02B70/00; Y02B70/10
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
181 words
An improved direct current-to-alternating current inverter system comprising: an SCR inverter adapted to be connected to a load, said inverter including a series resonant load circuit including an inductor, a capacitor and said load with an SCR connected in parallel relationship with said circuit; a current controlling means having one terminal operatively connected to said SCR inverter and another terminal adapted to be connected to a D.C. voltage source, said means controlling the application of said D.C. voltage source to said SCR inverter; frequency control means for maintaining the operation of said inverter at a substantially constant frequency, said frequency control means providing variable width gating signals to said current controlling means for controlling the duration of time said D.C. voltage source is applied to said SCR inverter and constant width gating signals to said SCR for controlling the conduction of said SCR; and means responsive to inverter system variations for altering the width of said variable width gating signals to ensure reliable SCR commutation as said SCR inverter maintains a substantially constant frequency of operation independently of said systEm variations.
Claim 2
Dependent Claim
181 words
An improved direct current-to-alternating current inverter system comprising: an SCR inverter adapted to be connected to a load, said inverter including a series resonant load circuit including an inductor, a capacitor and said load with an SCR connected in parallel relationship with said circuit; a current controlling means having one terminal operatively connected to said SCR inverter and another terminal adapted to be connected to a D.C. voltage source, said means controlling the application of said D.C. voltage source to said SCR inverter; frequency control means for maintaining the operation of said inverter at a substantially constant frequency, said frequency control means providing variable width gating signals to said current controlling means for controlling the duration of time said D.C. voltage source is applied to said SCR inverter and constant width gating signals to said SCR for controlling the conduction of said SCR; and means responsive to inverter system variations for altering the width of said variable width gating signals to ensure reliable SCR commutation as said SCR inverter maintains a substantially constant frequency of operation independently of said systEm variations.
Claim 3
Dependent Claim
26 words
The improved inverter of claim 1 wherein said current controlling means comprises a transistor and said transistor is electrically connected to said inverter with a reactor.
Claim 4
Dependent Claim
37 words
The improved inverter of claim 1 wherein said current controlling means comprises a transistor and said means for altering the width of said variable width gating signals includes means for sensing the power applied to said load.
Claim 5
Dependent Claim
30 words
The improved inverter of claim 1 wherein said means for altering the width of said variable width gating signals includes a peak voltage sensor sensing the voltage across said SCR.
Claim 6
Independent Claim
110 words
A method of controlling the current into a D.C. to A.C. inverter system wherein said inverter system includes a current controlling device adapted to be connected between a single SCR inverter and a source of D.C. voltage, said method comprising: sensing the voltage, current or power into said single SCR inverter; altering the duration of time said D.C. voltage source is applied to said SCR inverter in response to said sensing step by controlling the conduction of said current controlling device to maintain reliable SCR commutation; and maintaining said SCR inverter at a substantially constant frequency of operation substantially independent of voltage, current or power variations of said inverter system.
Claim 7
Independent Claim
110 words
A method of controlling the current into a D.C. to A.C. inverter system wherein said inverter system includes a current controlling device adapted to be connected between a single SCR inverter and a source of D.C. voltage, said method comprising: sensing the voltage, current or power into said single SCR inverter; altering the duration of time said D.C. voltage source is applied to said SCR inverter in response to said sensing step by controlling the conduction of said current controlling device to maintain reliable SCR commutation; and maintaining said SCR inverter at a substantially constant frequency of operation substantially independent of voltage, current or power variations of said inverter system.
Claim 8
Dependent Claim
56 words
The method of claim 5 wherein said current controlling device comprises a transistor and the step of altering the duration of time said D.C. voltage source is applied to said SCR inverter includes: controlling the duration of the conduction time of said transistor as an inversely related function of the current into said SCR inverter system.
Claim 9
Dependent Claim
144 words
An A.C. to D.C. to A.C. inverter system comprising: means for converting an A.C. voltage source to a D.C. voltage source; an SCR inverter adapted to be connected to a load, said inverter including a series resonant load circuit including an inductor, a capacitor and said load with an SCR connected in parallel relationship with said circuit; current control means connected between said D.C. voltage source and said SCR inverter for controlling the application of said D.C. voltage source to said SCR inverter; and frequency control means for maintaining the operation of SCR inverter at a substantially constant frequency, said means including an output providing variable width gating signals to said current control means for controlling the duration of time said D.C. voltage is applied to said SCR inverter and constant width gating signals to said SCR for controlling the conduction of said SCR.
Claim 10
Dependent Claim
144 words
An A.C. to D.C. to A.C. inverter system comprising: means for converting an A.C. voltage source to a D.C. voltage source; an SCR inverter adapted to be connected to a load, said inverter including a series resonant load circuit including an inductor, a capacitor and said load with an SCR connected in parallel relationship with said circuit; current control means connected between said D.C. voltage source and said SCR inverter for controlling the application of said D.C. voltage source to said SCR inverter; and frequency control means for maintaining the operation of SCR inverter at a substantially constant frequency, said means including an output providing variable width gating signals to said current control means for controlling the duration of time said D.C. voltage is applied to said SCR inverter and constant width gating signals to said SCR for controlling the conduction of said SCR.
Claim 11
Dependent Claim
32 words
The inverter system of claim 7 wherein said current control means comprises a transistor and said inverter system further includes a variable width pulser connected to the base electrode of said transistor.
Claim 12
Dependent Claim
28 words
The inverter system of claim 8 further comprising means responsive to current variations in said load for altering the width of the pulses from said variable width pulser.
Claim 13
Dependent Claim
21 words
The inverter system of claim 8 further comprising means responsive to a current in the inverter representative of the commutation margin.
Claim 14
Dependent Claim
30 words
The inverter of claim 11 wherein said inductor in said series resonant circuit comprises one winding of a transformer, the other winding of the transformer being connected to said load.
Claim 15
Dependent Claim
33 words
The inverter of claim 7 wherein said converting means comprises rectification means adapted to be connected to an A.C. voltage and filter means connected to said rectification means to provide said D.C. voltage.
Claim 16
Dependent Claim
36 words
The inverter of claim 8 further comprising: means for providing substantially constant frequency pulses to said variable width pulser and the gate electrode of said SCR to establish the frequency of operation of said inverter system.
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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) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |