US4476428A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power supply device
Assignee: Olympus Corp
•
Filing: 1983-06-20
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Granted: 1984-10-09
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Expires: 2003-06-20
Abstract
Abstract A power supply device for use in a superminiature tape recorder is disclosed. The device comprises a reference voltage generator circuit for generating an output therefrom in response to a reference voltage, a constant-current circuit for generating a constant current to obtain the reference voltage, a starting circuit for supplying a starting current to the constant current circuit and for branching a part of the starting current, and an electronic switch for causing flow of starting current therein so as to turn the constant-current circuit OFF.
Inventors
- 👤 Teruo Iwasawa
- 👤 Hitomi Tojiki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:30
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/46; G05F1/468; Y; Y10; Y10S; Y10S323/00; Y10S323/901
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
111 words
In a power supply device having a reference voltage generator circuit for generating an output therefrom in response to a reference voltage, the improvement comprising a constant-current circuit for generating a constant current to obtain the reference voltage, a starting circuit for supplying a starting current to the constant-current circuit and for branching a part of the starting current, and an electronic switch for shunting the starting current so as to turn the constant-current circuit OFF, said starting circuit and said constant-current circuit having active elements and passive resistive elements, said switch having only active elements and being connected only to active elements of said constant-current circuit and said starting circuit.
Claim 2
Dependent Claim
111 words
In a power supply device having a reference voltage generator circuit for generating an output therefrom in response to a reference voltage, the improvement comprising a constant-current circuit for generating a constant current to obtain the reference voltage, a starting circuit for supplying a starting current to the constant-current circuit and for branching a part of the starting current, and an electronic switch for shunting the starting current so as to turn the constant-current circuit OFF, said starting circuit and said constant-current circuit having active elements and passive resistive elements, said switch having only active elements and being connected only to active elements of said constant-current circuit and said starting circuit.
Claim 3
Dependent Claim
17 words
A power supply device as claimed in claim 1, wherein the electronic switch is an MOS FET.
Claim 4
Dependent Claim
34 words
A device as in claim 1, wherein said constant-current circuit includes an input having a transistor base and emitter said switch including an FET having source and drain connected directly to the base emitter.
References Cited (Backward Citations)
US3671770A
Cited
US3787757A
Cited
US3943380A
Cited
US3984761A
Cited
US4029974A
Cited
US4051392A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-09 | 1988-04-09 | 1988-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-09 | 1992-04-09 | 1992-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-09 | 1996-04-09 | 1996-10-09 | $7700.00 | Window Closed / Lapsed |