US5017858A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Constant-current regulated power circuit
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1990-08-14
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Granted: 1991-05-21
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Expires: 2010-08-14
Abstract
Abstract A constant current regulated power circuit comprises first and second voltage sources; a bias circuit connected to the first and second voltage sources for sending out a predetermined output voltage, the bias circuit having an output terminal; first and second resistors; and a transistor having a base connected to the output terminal of the bias circuit, an emitter connected to the first voltage source through the first resistor and to the second voltage source through the second resistor, respectively, and a collector operating as an output terminal.
Inventors
- 👤 Shigeo Hayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:44
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/46; G05F1/56; G05F1/561; G05F3/00; G05F3/02; G05F3/08; G05F3/10; G05F3/16; G05F3/20; G05F3/22; G05F3/222; G05F3/227; H; H03; H03K; H03K17/00; H03K17/14; H03K17/51; H03K17/56; H03K17/60; H03K17/603
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
103 words
A constant current regulated power circuit, comprising: a first voltage source; a second voltage source; a third voltage source which cooperates with said first voltage source; a bias circuit connected to said first and second voltage sources for sending out a predetermined output voltage, said bias circuit having an output terminal; a first resistor; a second resistor; and a transistor having a base connected to the output terminal of said bias circuit, an emitter connected to said third voltage source through said first resistor and to said second voltage source through said second resistor, respectively, and a collector operating as an output terminal.
Claim 2
Dependent Claim
103 words
A constant current regulated power circuit, comprising: a first voltage source; a second voltage source; a third voltage source which cooperates with said first voltage source; a bias circuit connected to said first and second voltage sources for sending out a predetermined output voltage, said bias circuit having an output terminal; a first resistor; a second resistor; and a transistor having a base connected to the output terminal of said bias circuit, an emitter connected to said third voltage source through said first resistor and to said second voltage source through said second resistor, respectively, and a collector operating as an output terminal.
Claim 3
Dependent Claim
17 words
A circuit as claimed in claim 1, wherein said third voltage source comprises said first voltage source.
Claim 4
Dependent Claim
25 words
A circuit as claimed in claim 1, further comprising at least one diode which is connected between said first voltage source and said first resistor.
Claim 5
Dependent Claim
102 words
A constant-current regulated power circuit, comprising: a first voltage source; a second voltage source; a third voltage source which cooperates with said first voltage source; a bias circuit connected to said first and second voltage sources for sending out a predetermined output voltage, said bias circuit having an output terminal; a first resistor; a second resistor; and a transistor having a gate connected to the output terminal of said bias circuit, a source connected to said third voltage source through said first resistor and to said second voltage source through said second resistor, respectively, and a drain operating as an output terminal.
Claim 6
Dependent Claim
102 words
A constant-current regulated power circuit, comprising: a first voltage source; a second voltage source; a third voltage source which cooperates with said first voltage source; a bias circuit connected to said first and second voltage sources for sending out a predetermined output voltage, said bias circuit having an output terminal; a first resistor; a second resistor; and a transistor having a gate connected to the output terminal of said bias circuit, a source connected to said third voltage source through said first resistor and to said second voltage source through said second resistor, respectively, and a drain operating as an output terminal.
Claim 7
Dependent Claim
17 words
A circuit as claimed in claim 4, wherein said third voltage source comprises said first voltage source.
Claim 8
Dependent Claim
25 words
A circuit as claimed in claim 4, further comprising at least one diode which is connected between said first voltage source and said first resistor.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1994-05-20 | 1994-11-19 | 1995-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-20 | 1998-11-19 | 1999-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-20 | 2002-11-19 | 2003-05-21 | $7700.00 | Window Closed / Lapsed |