US3746970A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Root mean square voltage regulator
Assignee: International Business Machines Corp
•
Filing: 1972-04-13
•
Granted: 1973-07-17
•
Expires: 1992-04-13
Abstract
Abstract A regulating power supply circuit in which the power supplied at the output is controlled by controlling the firing angle of a thyrister switching device in response to changes in a hybrid signal which is indicative of the difference between the RMS value of the output voltage and a desired RMS value. The hybrid signal is formed by summing a feedback current proportional to the absolute load voltage with a reference current proportional to the firing angle of the thyrister on a summing capacitor. Since for any given RMS voltage, the value of the average load voltage varies linearly with the conduction angle over a large range of conduction angles, the phase angle proportional reference current source is utilized to relate the absolute output voltage with the RMS voltage linearly over a wide range of input voltages.
Inventors
- 👤 Cleave G Van
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:46
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/66; G05F1/10; G05F1/12; G05F1/40; G05F1/44; G05F1/445
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
236 words
A root mean square voltage regulator for controlling in each half cycle the output voltage supplied to a load from an alternating current supply, said regulator comprising: switching means switchable from a high impedance condition to a low impedance condition in each half cycle connected between said load and said alternating current supply; said switching means having at least one control element for switching said switching means to said low impedance condition when a control signal supplied to the control element exceeds a predetermined threshold level; a feedback circuit connected in circuit with said switching means and said load for supplying a first signal indicative of the absolute value of the output voltage; circuit means coupled with said switching means for supplying a second signal indicative of the duration within each half cycle of the low impedance condition of said switching means; a constant signal source for supplying a constant signal; summing means for combining at least portions of said first signal, said second signal, and said constant signal for synthesizing a hybrid signal indicative of the difference between the root mean square value of the output voltage signal and a desired root mean square value; and means coupled with said summing means and said control element for supplying said control signal as a function of said hybrid signal thereby to maiNtain the root mean square magnitude of the output voltage substantially at a preselected level.
Claim 2
Dependent Claim
236 words
A root mean square voltage regulator for controlling in each half cycle the output voltage supplied to a load from an alternating current supply, said regulator comprising: switching means switchable from a high impedance condition to a low impedance condition in each half cycle connected between said load and said alternating current supply; said switching means having at least one control element for switching said switching means to said low impedance condition when a control signal supplied to the control element exceeds a predetermined threshold level; a feedback circuit connected in circuit with said switching means and said load for supplying a first signal indicative of the absolute value of the output voltage; circuit means coupled with said switching means for supplying a second signal indicative of the duration within each half cycle of the low impedance condition of said switching means; a constant signal source for supplying a constant signal; summing means for combining at least portions of said first signal, said second signal, and said constant signal for synthesizing a hybrid signal indicative of the difference between the root mean square value of the output voltage signal and a desired root mean square value; and means coupled with said summing means and said control element for supplying said control signal as a function of said hybrid signal thereby to maiNtain the root mean square magnitude of the output voltage substantially at a preselected level.
Claim 3
Dependent Claim
33 words
The root mean square voltage regulator set forth in claim 1 wherein said feedback circuit includes rectifying means connected in circuit with said switching means and said load for supplying said first signal.
Claim 4
Dependent Claim
33 words
The root mean square voltage regulator set forth in claim 1 wherein said first signal, said second signal, and said constant signal being current signals and wherein said summing means comprises a capacitor.
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) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |