US3711747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power transformer primary winding fuse arrangement
Assignee: Sony Corp
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Filing: 1971-08-10
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Granted: 1973-01-16
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Expires: 1991-08-10
Abstract
Abstract A power supply for use with different AC line voltages, which includes a power transformer having a plurality of separate primary windings and a corresponding plurality of fuses connected thereto. The primary windings are connected to each other in several different ways to change the turns ratio of the power transformer depending upon the value of the voltage supplied thereto. Thus, a predetermined voltage is produced in the secondary winding of the transformer irrespective of the value of the supplied AC line voltage and the current flowing through each of the fuses is held substantially constant, during normal operating conditions, regardless of the manner in which the separate primary windings are connected.
Inventors
- 👤 H Sahara
- 👤 K Yamakawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:11
CPC Classifications
H; H01; H01F; H01F29/00; H01F29/02; H02; H02H; H02H7/00; H02H7/04; H02M; H02M5/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
112 words
A power supply for use with input voltages of differing magnitude, said power supply comprising; a power transformer having a secondary winding and a plurality of separate primary windings, said primary windings being interconnected to supply a predetermined operating voltage to an external load; means for supplying a source of AC voltage to said plurality of primary windings; means for selectively changing the interconnection of said primary windings, to maintain said predetermined operating voltage when said source of AC voltage is of differing magnitude; and a plurality of fuse means, a separate one of said fuse means being connected, in series, between each of said separate primary windings and said changing means.
Claim 2
Dependent Claim
112 words
A power supply for use with input voltages of differing magnitude, said power supply comprising; a power transformer having a secondary winding and a plurality of separate primary windings, said primary windings being interconnected to supply a predetermined operating voltage to an external load; means for supplying a source of AC voltage to said plurality of primary windings; means for selectively changing the interconnection of said primary windings, to maintain said predetermined operating voltage when said source of AC voltage is of differing magnitude; and a plurality of fuse means, a separate one of said fuse means being connected, in series, between each of said separate primary windings and said changing means.
Claim 3
Dependent Claim
19 words
A power supply according to claim 1, wherein said separate primary windings each have the same number of turns.
Claim 4
Dependent Claim
23 words
A power supply according to claim 2, wherein each of said separate primary windings is provided with at least one intermediate winding tap.
Claim 5
Dependent Claim
58 words
A power supply according to claim 1, wherein said changing means includes means for selectively changing the turns ratio of said power transformer to correspond to predetermined magnitudes of the AC voltage supplied to the primary windings, thereby providing a substantially constant voltage at the output of the power supply, irrespective of the magnitude of said AC voltage.
Claim 6
Dependent Claim
86 words
A power supply for use with any one of a plurality of different AC input voltages, said power supply comprising; a power transformer having a secondary winding and at least two separate primary windings each having the same number of turns; means for supplying a source of AC voltage to said two primary windings; means for changing the connecting relationship between said two primary windings; and at least two fuse means respectively connected in series between each of said two primary windings and said changing means.
Claim 7
Dependent Claim
86 words
A power supply for use with any one of a plurality of different AC input voltages, said power supply comprising; a power transformer having a secondary winding and at least two separate primary windings each having the same number of turns; means for supplying a source of AC voltage to said two primary windings; means for changing the connecting relationship between said two primary windings; and at least two fuse means respectively connected in series between each of said two primary windings and said changing means.
Claim 8
Dependent Claim
25 words
A power supply according to claim 5, wherein each of said two primary windings has a terminal connecting to an intermediate tap on said winding.
Claim 9
Dependent Claim
20 words
A power supply according to claim 6, wherein the primary windings are supplied with AC voltage through said changing 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) | 1976-01-16 | 1976-07-17 | 1977-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-16 | 1980-07-17 | 1981-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-16 | 1984-07-17 | 1985-01-16 | $7700.00 | Window Closed / Lapsed |