US3921058A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for compensating AC power source voltage
Assignee: Panasonic Holdings Corp
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Filing: 1974-01-23
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Granted: 1975-11-18
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Expires: 1994-01-23
Abstract
Abstract The power source voltage is detected beforehand through a filter and phase shifter. When the detected voltage reaches the reference voltage through comparison of the detected voltage and the reference voltage, the conduction phase is controlled by turning a phase-controlled rectifier connected in series with the power source circuit, and the amount of the power source current is controlled with respect to time to compensate the effective primary terminal voltage of the power source transformer. When the power source voltage is high, current flows for a short. And when it is low, current flows for a longer period of time.
Inventors
- 👤 Masaru Tanaka
- 👤 Takeshi Oku
- 👤 Yoshimitsu Matsumoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:06
CPC Classifications
B; B23; B23K; B23K11/00; B23K11/24; B23K11/25
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
113 words
Device for compensating AC power source voltage comprising: a. a phase controlled rectifier connected in series to the primary circuit of a power source transformer; b. a power source voltage detector composed of a filter including RC elements and a transistor for blocking transmission of high frequencies and a phase shifter; c. a comparator connected to compare the detected voltage of said power source voltage detector and the reference voltage; and d. means for controlling the effective terminal voltage of the primary circuit of said power source transformer by controlling the conduction phase of said phase controlled rectifier in correspondence to the timing when said detected voltage becomes equal to said reference voltage.
Claim 2
Dependent Claim
113 words
Device for compensating AC power source voltage comprising: a. a phase controlled rectifier connected in series to the primary circuit of a power source transformer; b. a power source voltage detector composed of a filter including RC elements and a transistor for blocking transmission of high frequencies and a phase shifter; c. a comparator connected to compare the detected voltage of said power source voltage detector and the reference voltage; and d. means for controlling the effective terminal voltage of the primary circuit of said power source transformer by controlling the conduction phase of said phase controlled rectifier in correspondence to the timing when said detected voltage becomes equal to said reference voltage.
Claim 3
Dependent Claim
13 words
Device according to claim 1 wherein said filter is a band pass filter.
Claim 4
Dependent Claim
13 words
Device according to claim 1 wherein said filter is a low pass filter.
References Cited (Backward Citations)
US2393884A
Cited
US2617977A
Cited
US3128422A
Cited
US3233165A
Cited
US3504270A
Cited
US3351810A
Cited
US3502960A
Cited
US3646423A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |