US3564394A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chopper-type alternating current regulator employing amplitude sensor and zero crossing detector
Assignee: POWER CONTROL CORP
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Filing: 1969-01-03
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Granted: 1971-02-16
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Expires: 1989-01-03
Abstract
Abstract A FAST RESPONSE TIME VOLTAGE REGULATOR WHICH WILL MAINTAIN THE AMPLITUDE OF AN ALTERNATING CURRENT VOLTAGE CONSTANT OVER A RELATIVELY WIDE RANGE OF FREQUENCIES. THIS IS ACCOMPLISHED BY CHOPPING THE INPUT ALTERNATING CURRENT VOLTAGE AT A FREQUENCY MUCH HIGHER THAN THAT OF THE ALTERNATING CURRENT VOLTAGE TO BE REGULATED, AND THEREAFTER FILTERING THE CHOPPER WAVEFORM TO RECONSTRUCT A TRUE SINE WAVE. BY SENSING THE AMPLITUDE OF THE FILTERED OUTPUT AND BY VARING THE "ON" AND "OFF" TIMES OF THE CHOPPER AS A FUNCTION OF VARIATIONS IN AMPLITUDE, SAID AMPLITUDE CAN BE MAINTAINED CONSTANT.
Inventors
- 👤 Kenneth E Opal
- 👤 John S Hess Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:57
CPC Classifications
H; H02; H02M; H02M5/00; H02M5/02; H02M5/04; H02M5/22; H02M5/25; H02M5/27; H02M5/275; H02M5/293
Claims Analysis
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References Cited (Backward Citations)
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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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |