US3936675A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reference point potential compensating circuit for use with phase controller
Assignee: Fujifilm Business Innovation Corp
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Filing: 1973-12-26
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Granted: 1976-02-03
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Expires: 1993-12-26
Abstract
Abstract Reference point potential compensating circuitry for controlling phase control circuitry which regulates the value of a predetermined parameter, the compensating circuitry comprising means for generating a first signal which varies periodically with time; means, responsive to the first signals, for generating a second signal which periodically increases in amplitude with respect to time; means for generating a third signal, the amplitude of which is a function of the predetermined parameter; means for adding the second and third signals to develop a fourth signal; means, responsive to the first signal, for generating a fifth signal, the amplitude of which is a function of the frequency of the first signal; means for comparing the fourth and fifth signals to generate a sixth signal, the sixth signal being applied to the phase control circuitry to render the operation of the phase control circuitry independent of frequency or amplitude variations of the first signal.
Inventors
- 👤 Tetsuo Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:37
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/08; H02M1/081; G; G05; G05F; G05F1/00; G05F1/10; G05F1/12; G05F1/40; G05F1/44; G05F1/445; G05F1/45; G05F1/455
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
173 words
Reference point potential compensating circuitry for controlling phase control circuitry, which regulates the value of a predetermined parameter, said compensating circuitry comprising means for generating a first signal which varies in amplitude periodically with time; means for generating a second signal, the amplitude of which varies as a function of said predetermined parameter; means for adding all values of said first and second signals to develop a third signal which is a substantially linear sum of said first and second signals; means, responsive to said first signal, for generating a fourth signal, the amplitude of which is a function of the frequency of said first signal and which is representative of a desired value of said parameter; means for comparing said third and fourth signals to generate a fifth signal when said third and fourth signals are substantially equal, said fifth signal being applied to said phase control circuitry so that said phase control circuitry can maintain said parameter at said desired value independent of frequency or amplitude variations of said first signal.
Claim 2
Dependent Claim
173 words
Reference point potential compensating circuitry for controlling phase control circuitry, which regulates the value of a predetermined parameter, said compensating circuitry comprising means for generating a first signal which varies in amplitude periodically with time; means for generating a second signal, the amplitude of which varies as a function of said predetermined parameter; means for adding all values of said first and second signals to develop a third signal which is a substantially linear sum of said first and second signals; means, responsive to said first signal, for generating a fourth signal, the amplitude of which is a function of the frequency of said first signal and which is representative of a desired value of said parameter; means for comparing said third and fourth signals to generate a fifth signal when said third and fourth signals are substantially equal, said fifth signal being applied to said phase control circuitry so that said phase control circuitry can maintain said parameter at said desired value independent of frequency or amplitude variations of said first signal.
Claim 3
Dependent Claim
32 words
Circuitry as in claim 1 where said means for generating a first signal comprises a power supply for generating a sinusoidal signal, the frequency or amplitude of which is subject to variation.
Claim 4
Dependent Claim
18 words
Circuitry as in claim 1 where said means for generating said fourth signal comprises an R-C integrating circuit.
Claim 5
Dependent Claim
91 words
Circuitry as in claim 1 where said means for generating said fifth signal comprises (1) a unijunction transistor, said third signal being applied to the anode of said transistor and said fourth signal being applied to the gate thereof and (2) a discharge means in circuit with said transistor, said phase control circuitry being connected to the cathode of said transistor so that when said third signal is slightly greater than said fourth signal, said fifth signal is applied as a pulse to initiate the operation of said phase control circuitry.
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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) | 1979-02-02 | 1979-08-04 | 1980-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-02 | 1983-08-04 | 1984-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-02 | 1987-08-04 | 1988-02-03 | $7700.00 | Window Closed / Lapsed |