US4983905A
Expired / Lapsed
US
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Constant voltage source circuit
Assignee: Denso Ten Ltd
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Filing: 1989-07-05
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Granted: 1991-01-08
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Expires: 2009-07-05
Abstract
Abstract A constant voltage source circuit which is provided with an output transistor (Q 1 ) for outputting a predetermined output voltage (V 0 ) in accordance with an input voltage (V IN ) and a differential amplifier (A), and is further characterized in that the circuit further comprises a reference voltage control means which monitors variations of the input voltage (V IN ) and outputs a predetermined constant voltage to the differential amplifier (A) as a reference voltage when the input voltage (V IN ) is higher than, a predetermined voltage level, and a voltage varied in accordance with the variation of the input voltage (V IN ) is output therefrom to the differential amplifier (A) as a reference voltage when the input voltage (V IN ) falls below a predetermined voltage level.
Inventors
- 👤 Yoshiaki Sano
- 👤 Toshio Hanazawa
- 👤 Yasuhide Katagase
- 👤 Katsuyuki Yasukouchi
- 👤 Takashi Matsumoto
- 👤 Susumu Fujihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:40
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/46; G05F1/56; G05F1/565
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
123 words
A constant voltage source circuit comprising: an input terminal for receiving an input voltage; an output transistor connected to said input terminal for outputting a predetermined output voltage in accordance with said input voltage; a differential amplifier for controlling said output transistor; and a reference voltage control means, operatively connected to said differential amplifier and said input terminal, for monitoring variations of said input voltage and for outputting a predetermined constant voltage to said differential amplifier as a reference voltage when said input voltage is higher than a predetermined voltage level, and outputting a voltage varied in accordance with the variation of said input voltage to said differential amplifier as the reference voltage when said input voltage falls below said predetermined voltage level.
Claim 2
Dependent Claim
123 words
A constant voltage source circuit comprising: an input terminal for receiving an input voltage; an output transistor connected to said input terminal for outputting a predetermined output voltage in accordance with said input voltage; a differential amplifier for controlling said output transistor; and a reference voltage control means, operatively connected to said differential amplifier and said input terminal, for monitoring variations of said input voltage and for outputting a predetermined constant voltage to said differential amplifier as a reference voltage when said input voltage is higher than a predetermined voltage level, and outputting a voltage varied in accordance with the variation of said input voltage to said differential amplifier as the reference voltage when said input voltage falls below said predetermined voltage level.
Claim 3
Dependent Claim
90 words
A constant voltage source circuit according to claim 1, wherein said reference voltage control means further comprises a first reference voltage supply means for supplying said predetermined constant voltage to said differential amplifier (A) when said input voltage (V IN ) is higher than the predetermined voltage level and a second reference voltage supply means for supplying said voltage varied in accordance with the variation of said input voltage (V IN ) to said differential amplifier (A) when said input voltage (V IN ) falls below the predetermined voltage level.
Claim 4
Dependent Claim
114 words
A constant voltage source circuit according to claim 1, wherein said reference voltage control means further comprises a reference voltage supply means for supplying said predetermined constant voltage to said differential amplifier (A) when said input voltage (V IN ) is higher than the predetermined voltage level and a bias voltage supply means for supplying a bias voltage varied in accordance with the variation of said input voltage (V IN ) to said reference voltage supply means so as to provide said voltage (V RB ) varied in accordance with the variation of said bias voltage to said differential amplifier (A) when said input voltage (V IN ) falls below the predetermined voltage level.
Claim 5
Dependent Claim
30 words
A constant voltage source circuit according to claim 1, wherein said circuit further comprises a ripple elimination means for eliminating a ripple accumulated in said input voltage (V IN ).
Claim 6
Dependent Claim
19 words
A constant voltage source circuit according to claim 1, wherein said output transistor (Q 1 ) comprises a transistor.
Claim 7
Dependent Claim
30 words
A constant voltage source circuit according to claim 2, wherein said circuit further comprises a ripple elimination means for eliminating a ripple accumulated in said input voltage (V IN ).
Claim 8
Dependent Claim
16 words
A constant voltage source circuit according to claim 3, wherein said circuit further comprises a ripple.
Claim 9
Dependent Claim
19 words
A constant voltage source circuit according to claim 2, wherein said output transistor (Q 1 ) comprises a transistor.
Claim 10
Dependent Claim
19 words
A constant voltage source circuit according to claim 3, wherein said output transistor (Q 1 ) comprises a transistor.
Claim 11
Dependent Claim
26 words
A constant voltage source circuit according to claim 1, wherein said output transistor (Q 1 ) comprises a pair of transistors connected by a Darlington connection.
Claim 12
Dependent Claim
27 words
A constant voltage source circuit according to claim 1, wherein said output transistor (Q 1 ) comprises a pair of transistors connected by an inverted Darlington connection.
Claim 13
Dependent Claim
26 words
A constant voltage source circuit according to claim 2, wherein said output transistor (Q 1 ) comprises a pair of transistors connected by a Darlington connection.
Claim 14
Dependent Claim
27 words
A constant voltage source circuit according to claim 2, wherein said output transistor (Q 1 ) comprises a pair of transistors connected by an inverted Darlington connection.
Claim 15
Dependent Claim
26 words
A constant voltage source circuit according to claim 3, wherein said output transistor (Q 1 ) comprises a pair of transistors connected by a Darlington connection.
Claim 16
Dependent Claim
27 words
A constant voltage source circuit according to claim 3, wherein said output transistor (Q 1 ) comprises a pair of transistors connected by an inverted Darlington connection.
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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) | 1994-01-07 | 1994-07-09 | 1995-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-07 | 1998-07-09 | 1999-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-07 | 2002-07-09 | 2003-01-08 | $7700.00 | Window Closed / Lapsed |