US3703678A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Isolating power supply
Assignee: AT&T Inc
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Filing: 1971-05-12
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Granted: 1972-11-21
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Expires: 1991-05-12
Abstract
Abstract An isolating power supply having direct-current power as its input and providing a direct-current output having a ground that is independent of the input power lines.
Inventors
- 👤 David Reis Weller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:18
CPC Classifications
G; G05; G05F; G05F3/00; G05F3/02; G05F3/08; G05F3/10; G05F3/16; G05F3/20; G05F3/22; G05F3/222; G05F3/227; G05F3/18; H; H02; H02M; H02M3/00; H04; H04B; H04B3/00; H04B3/02; H04B3/44; H04L; H04L12/00; H04L12/28; H04L12/42
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
187 words
An isolating power supply adapted to transfer direct-current power from a pair of input power lines to a pair of output power lines, said output power lines being referenced to a ground that is independent of said input power lines, said isolating power supply comprising: a first constant-voltage source for coupling a first one of said pair of input power lines to a first one of said pair of output power lines; a first voltage-biasing means connected to said first constantvoltage source and to said reference ground; a first constant-current source connected to said first voltagebiasing means and to said first one of said pair of input power lines for activating said first voltage-biasing means; a second constant-voltage source for coupling the second one of said pair of input power lines to the second one of said pair of output power lines; a second voltage-biasing means connected to said second constant-voltage source and to said reference ground; and a second constant-current source connected to said second voltage-biasing means and to said second one of said pair of input power lines for activating said second voltage biasing means.
Claim 2
Dependent Claim
187 words
An isolating power supply adapted to transfer direct-current power from a pair of input power lines to a pair of output power lines, said output power lines being referenced to a ground that is independent of said input power lines, said isolating power supply comprising: a first constant-voltage source for coupling a first one of said pair of input power lines to a first one of said pair of output power lines; a first voltage-biasing means connected to said first constantvoltage source and to said reference ground; a first constant-current source connected to said first voltagebiasing means and to said first one of said pair of input power lines for activating said first voltage-biasing means; a second constant-voltage source for coupling the second one of said pair of input power lines to the second one of said pair of output power lines; a second voltage-biasing means connected to said second constant-voltage source and to said reference ground; and a second constant-current source connected to said second voltage-biasing means and to said second one of said pair of input power lines for activating said second voltage biasing means.
Claim 3
Dependent Claim
187 words
An isolating power supply adapted to transfer direct-current power from a pair of input power lines to a pair of output power lines, said output power lines being referenced to a ground that is independent of said input power lines, said isolating power supply comprising: a first constant-voltage source for coupling a first one of said pair of input power lines to a first one of said pair of output power lines; a first voltage-biasing means connected to said first constant-voltage source and to said reference ground; a first constant-current source connected to said first voltage-biasing means and to said first one of said pair of input power lines for activating said first voltage-biasing means; a second constant-voltage source for coupling the second one of said pair of input power lines to the second one of said pair of output power lines; a second voltage-biasing means connected to said second constant-voltage source and to said reference ground; and a second constant-current source connected to said second voltage-biasing means and to said second one of said pair of input power lines for activating said second voltage biasing means.
Claim 4
Dependent Claim
187 words
An isolating power supply adapted to transfer direct-current power from a pair of input power lines to a pair of output power lines, said output power lines being referenced to a ground that is independent of said input power lines, said isolating power supply comprising: a first constant-voltage source for coupling a first one of said pair of input power lines to a first one of said pair of output power lines; a first voltage-biasing means connected to said first constant-voltage source and to said reference ground; a first constant-current source connected to said first voltage-biasing means and to said first one of said pair of input power lines for activating said first voltage-biasing means; a second constant-voltage source for coupling the second one of said pair of input power lines to the second one of said pair of output power lines; a second voltage-biasing means connected to said second constant-voltage source and to said reference ground; and a second constant-current source connected to said second voltage-biasing means and to said second one of said pair of input power lines for activating said second voltage biasing means.
Claim 5
Dependent Claim
19 words
The isolating power supply of claim 1 wherein both of said first and said second constant-voltage sources comprise emitter-followers.
Claim 6
Dependent Claim
27 words
The isolating power supply of claim 2 wherein said first voltage-biasing means comprises a Zener diode and said second voltage-biasing means comprises two diodes connected in series.
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) | 1975-11-21 | 1976-05-22 | 1976-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-21 | 1980-05-22 | 1980-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-21 | 1984-05-22 | 1984-11-21 | $7700.00 | Window Closed / Lapsed |