US3720868A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple input voltage source power supply
Assignee: Zenith Electronics LLC
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Filing: 1972-01-10
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Granted: 1973-03-13
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Expires: 1992-01-10
Abstract
Abstract A power supply for supplying a predetermined d.c. output voltage notwithstanding its connection to external a.c. voltage sources of different voltage magnitudes operates in either a full wave rectifying or diode ridge rectifying mode to accommodate the different source voltage. A zener diode senses the source voltage magnitude and a mode control voltage controls a switching circuit for establishing the power supply in the proper rectifying mode.
Inventors
- 👤 C Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:17
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/02; H02M3/04; H02M3/10; H02M3/145; H02M3/155; H02M1/00; H02M1/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
192 words
An a.c. to d.c. voltage power supply which supplies a predetermined output voltage notwithstanding its connection to a.c. external voltage sources of first or second voltages of substantially different magnitudes by operating in either one of two distinct operating modes comprising: an a.c. voltage center tapped transformer having input terminals for connection to an external a.c. voltage source for transforming the external a.c. voltage applied to its terminals; rectifying means coupled across said transformer which operate in either a full-wave bridge or full-wave center tap operating mode to accommodate said first or second a.c. source voltages for providing a pulsating d.c. voltage and having output terminals for connection to an external load; monitoring means for sensing the first or second voltage magnitude of said external a.c. voltage applied to said input terminals and for providing a mode control voltage in response to said first or second magnitude of said external a.c. voltage; and switching means coupled to said rectifying means and to said monitoring means for switching said rectifying means into said full-wave bridge or full-wave center tap operating mode in response to said mode control voltage developed by said monitoring means.
Claim 2
Dependent Claim
192 words
An a.c. to d.c. voltage power supply which supplies a predetermined output voltage notwithstanding its connection to a.c. external voltage sources of first or second voltages of substantially different magnitudes by operating in either one of two distinct operating modes comprising: an a.c. voltage center tapped transformer having input terminals for connection to an external a.c. voltage source for transforming the external a.c. voltage applied to its terminals; rectifying means coupled across said transformer which operate in either a full-wave bridge or full-wave center tap operating mode to accommodate said first or second a.c. source voltages for providing a pulsating d.c. voltage and having output terminals for connection to an external load; monitoring means for sensing the first or second voltage magnitude of said external a.c. voltage applied to said input terminals and for providing a mode control voltage in response to said first or second magnitude of said external a.c. voltage; and switching means coupled to said rectifying means and to said monitoring means for switching said rectifying means into said full-wave bridge or full-wave center tap operating mode in response to said mode control voltage developed by said monitoring means.
Claim 3
Dependent Claim
192 words
An a.c. to d.c. voltage power supply which supplies a predetermined output voltage notwithstanding its connection to a.c. external voltage sources of first or second voltages of substantially different magnitudes by operating in either one of two distinct operating modes comprising: an a.c. voltage center tapped transformer having input terminals for connection to an external a.c. voltage source for transforming the external a.c. voltage applied to its terminals; rectifying means coupled across said transformer which operate in either a full-wave bridge or full-wave center tap operating mode to accommodate said first or second a.c. source voltages for providing a pulsating d.c. voltage and having output terminals for connection to an external load; monitoring means for sensing the first or second voltage magnitude of said external a.c. voltage applied to said input terminals and for providing a mode control voltage in response to said first or second magnitude of said external a.c. voltage; and switching means coupled to said rectifying means and to said monitoring means for switching said rectifying means into said full-wave bridge or full-wave center tap operating mode in response to said mode control voltage developed by said monitoring means.
Claim 4
Dependent Claim
192 words
An a.c. to d.c. voltage power supply which supplies a predetermined output voltage notwithstanding its connection to a.c. external voltage sources of first or second voltages of substantially different magnitudes by operating in either one of two distinct operating modes comprising: an a.c. voltage center tapped transformer having input terminals for connection to an external a.c. voltage source for transforming the external a.c. voltage applied to its terminals; rectifying means coupled across said transformer which operate in either a full-wave bridge or full-wave center tap operating mode to accommodate said first or second a.c. source voltages for providing a pulsating d.c. voltage and having output terminals for connection to an external load; monitoring means for sensing the first or second voltage magnitude of said external a.c. voltage applied to said input terminals and for providing a mode control voltage in response to said first or second magnitude of said external a.c. voltage; and switching means coupled to said rectifying means and to said monitoring means for switching said rectifying means into said full-wave bridge or full-wave center tap operating mode in response to said mode control voltage developed by said monitoring means.
Claim 5
Dependent Claim
31 words
An a.c. to d.c. voltage power supply in accordance with claim 1 wherein said a.c. voltage center tapped transformer has a diode coupled between the center tap and a reference potential.
Claim 6
Dependent Claim
46 words
An a.c. to d.c. voltage power supply in accordance with claim 1 where said first voltage source magnitude is substantially less than said second voltage source magnitude and where said rectifying means operates in said full-wave bridge rectifying mode to accommodate said first a.c. source voltage.
Claim 7
Dependent Claim
47 words
An a.c. to d.c. voltage power supply in accordance with claim 1 where said second voltage source magnitude is substantially greater than said first voltage source magnitude and where said rectifying means operates in said full-wave center tap rectifying mode to accommodate said second a.c. source voltage.
Claim 8
Dependent Claim
80 words
An a.c. to d.c. voltage power supply in accordance with claim 1 wherein said switching means comprise a first and second transistor, said mode control voltage being applied to said first transistor, and where said second transistor is saturated to establish said rectifying means in said full-wave bridge operating mode and where said first transistor is saturated by said mode control voltage to cut off said second transistor to establish said rectifying means in said full-wave center tap operating mode.
Claim 9
Dependent Claim
20 words
An a.c. to d.c. voltage power supply in accordance with claim 1 where said monitoring means comprise a zener diode.
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) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |