US3742338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dc voltage regulator circuit
Assignee: Panasonic Holdings Corp
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Filing: 1972-03-08
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Granted: 1973-06-26
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Expires: 1992-03-08
Abstract
Abstract A circuit in which the voltage derived from a reference diode or silicon zener diode is fed back through an emitter-follower circuit to the base of a transistor and the constant current flowing through the emitter-collector circuit of the transistor is in turn applied to the reference diode so that such a stabilized output voltage as cannot be attained by the zener diode alone may be obtained.
Inventors
- 👤 H Sugano
- 👤 A Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:55
CPC Classifications
G; G05; G05F; G05F3/00; G05F3/02; G05F3/08; G05F3/10; G05F3/16; G05F3/18
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
140 words
In combination with a voltage regulator having an emitter follower connected between input and output terminals and a zener diode connected to the base of the emitter follower to maintain a substantially constant base voltage, means for stabilizing the voltage at the output terminal, comprising a current control transistor having an input base and an output collector connected to the zener diode for controlling the supply of base current to the base of the emitter follower, bias voltage control means connected to the input base of the control transistor for maintaining said base current constant, means connected to the output terminal for supplying a reference voltage to the bias voltage control means, and initial current conducting means connecting the input terminal to the base of the emitter follower for instantaneously rendering the emitter follower conductive to establish said reference voltage.
Claim 2
Dependent Claim
140 words
In combination with a voltage regulator having an emitter follower connected between input and output terminals and a zener diode connected to the base of the emitter follower to maintain a substantially constant base voltage, means for stabilizing the voltage at the output terminal, comprising a current control transistor having an input base and an output collector connected to the zener diode for controlling the supply of base current to the base of the emitter follower, bias voltage control means connected to the input base of the control transistor for maintaining said base current constant, means connected to the output terminal for supplying a reference voltage to the bias voltage control means, and initial current conducting means connecting the input terminal to the base of the emitter follower for instantaneously rendering the emitter follower conductive to establish said reference voltage.
Claim 3
Dependent Claim
35 words
The combination of claim 1 wherein said reference voltage supply means comprises a voltage divider connected to the output terminal, and an emitter follower circuit connecting the voltage divider to the bias voltage control means.
Claim 4
Dependent Claim
61 words
The combination of claim 2 wherein said bias voltage control means comprises a constant current conducting transistor having collector and emitter circuits connected in parallel with said emitter follower circuit and a base connected to an output of the emitter follower circuit, the collector circuit of the constant current conducting transistor being connected to the input base of the control transistor.
Claim 5
Dependent Claim
19 words
The combination of claim 3 wherein said initial current conducting means comprises a resistor connected to the input terminal.
Claim 6
Dependent Claim
138 words
A dc voltage regulator comprising power supply and output terminals, a first transistor having a collector and an emitter connected respectively to said power supply terminal and said output terminal and a base, a reference diode connected between the base of said first transistor and ground, parallel circuits consisting of a resistor and a second transistor, said parallel circuits being connected between the power supply terminal and the base of said first transistor, a voltage divider circuit connected in series with the emitter of said first transistor, a third transistor having an emitter, a collector connected to the power supply terminal and a base connected to said voltage divider circuit, the output from the emitter of said third transistor being coupled to the base of said second transistor to control base bias voltage applied to said second transistor.
Claim 7
Dependent Claim
138 words
A dc voltage regulator comprising power supply and output terminals, a first transistor having a collector and an emitter connected respectively to said power supply terminal and said output terminal and a base, a reference diode connected between the base of said first transistor and ground, parallel circuits consisting of a resistor and a second transistor, said parallel circuits being connected between the power supply terminal and the base of said first transistor, a voltage divider circuit connected in series with the emitter of said first transistor, a third transistor having an emitter, a collector connected to the power supply terminal and a base connected to said voltage divider circuit, the output from the emitter of said third transistor being coupled to the base of said second transistor to control base bias voltage applied to said second transistor.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |