Patent US3686560A successfully refreshed from Google Patents.
US3686560A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized power supply systems
Assignee: Fujitsu Services Ltd
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Filing: 1971-05-06
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Granted: 1972-08-22
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Expires: 1991-05-06
Abstract
Abstract A D.C. power supply employs shunt stabilization of the output of a full-wave rectifier for an A.C. source. The A.C. source is a low-loss, high impedance type and a shunt stabilizer can be connected across the source output and/or the rectifier output.
Inventors
- 👤 Hans Heinz Lutterkort
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:14
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/12; G05F1/40; G05F1/44; G05F1/46; G05F1/56; G05F1/563; G05F1/613
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
134 words
A D.C. power supply system comprising a low-loss high impedance source of alternating current as a first output; a full wave rectifier connected to the first output to produce a direct current at a second output; a first shunt stabilizer including a triac having its conductive path connected in a low resistance shunt path across the first output, first switching means for repeatedly switching the triac to conduct over a portion of a succession of A.C. cycles, and means for inhibiting the switching means except when the D.C. load signal exceeds a predetermined level; a second shunt stabilizer means having a transistor with its emitter collector in a low resistance path shunting the second output and second switching means for switching the transistor to conduct when the D.C. load signal exceeds said predetermined level.
Claim 2
Dependent Claim
134 words
A D.C. power supply system comprising a low-loss high impedance source of alternating current as a first output; a full wave rectifier connected to the first output to produce a direct current at a second output; a first shunt stabilizer including a triac having its conductive path connected in a low resistance shunt path across the first output, first switching means for repeatedly switching the triac to conduct over a portion of a succession of A.C. cycles, and means for inhibiting the switching means except when the D.C. load signal exceeds a predetermined level; a second shunt stabilizer means having a transistor with its emitter collector in a low resistance path shunting the second output and second switching means for switching the transistor to conduct when the D.C. load signal exceeds said predetermined level.
Claim 3
Dependent Claim
65 words
A D.C. power supply system as claimed in claim 1, and comprising means for providing a reference signal at said predetermined level, a comparator connected to receive said reference signal and said D.C. load signal and to provide a switching signal for the transistor when said level signal exceeds said reference signal, and means responsive to conduction of the transistor for disabling the inhibiting means.
Claim 4
Dependent Claim
83 words
A D.C. power supply system as claimed in claim 1, wherein the first switching means comprises means for squaring an A.C. signal from said source, and differentiation means for deriving from the square wave, pulses at the start of each half cycle, and wherein the first switching means also includes a saturable transformer having a first winding for said pulses, a second winding for supplying the control electrode of the triac, and a third normally energized saturating winding included in the inhibiting means.
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) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |