US3781654A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switching voltage regulator circuit
Assignee: HP Inc
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Filing: 1972-05-26
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Granted: 1973-12-25
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Expires: 1992-05-26
Abstract
Abstract A tapped inductor is utilized in a switching mode voltage regulator, which employs a pass transistor and an associated driver transistor connected in a modified Darlington configuration, for the purpose of allowing these transistors to saturate during switching, thereby substantially increasing the over-all efficiency of the regulator. A filter circuit may be added at the output of the voltage regulator to significantly reduce ripple and to improve the response of the regulator to load transients.
Inventors
- 👤 K Simcoe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:57
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/02; H02M3/04; H02M3/10; H02M3/145; H02M3/155; H02M3/156; H02M3/1563
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
138 words
An improved switching circuit for deriving a regulated D.C. voltage from a source of unregulated D.C. voltage, said switching circuit being of the type having at least a switching transistor, an associated driver transistor, a linear differential amplifier with an inverting input for sensing the output voltage at An output of the switching circuit, with a non-inverting input for sensing a source of reference potential, and with an output for driving the switching and driver transistors, and a tapped inductor connected between the collector of the switching transistor and the output of the switching circuit, wherein the improvement comprises a transformer having a first winding connected between the tapped inductor and the output of the switching circuit and a second winding connected between the output of the switching circuit and the inverting input of the linear differential amplifier.
Claim 2
Dependent Claim
138 words
An improved switching circuit for deriving a regulated D.C. voltage from a source of unregulated D.C. voltage, said switching circuit being of the type having at least a switching transistor, an associated driver transistor, a linear differential amplifier with an inverting input for sensing the output voltage at An output of the switching circuit, with a non-inverting input for sensing a source of reference potential, and with an output for driving the switching and driver transistors, and a tapped inductor connected between the collector of the switching transistor and the output of the switching circuit, wherein the improvement comprises a transformer having a first winding connected between the tapped inductor and the output of the switching circuit and a second winding connected between the output of the switching circuit and the inverting input of the linear differential amplifier.
Claim 3
Dependent Claim
163 words
An improved switching circuit for deriving a regulated D.C. voltage from a source of unregulated D.C. voltage, said switching circuit being of the type havng at least a switching transistor, an associated driver transistor, a linear differential amplifier with an inverting input for sensing the output signal at an output of the switching circuit, with a non-inverting input for sensing a source of reference potential, and with an output for driving the switching and driver transistors, and a tapped inductor connected between the collector of the switching transistor and the output of the switching circuit, wherein the improvement comprises a filter inductor interposed between the tapped inductor and the output of the switching circuit and associated means for coupling a feedback signal comprising both a ripple signal appearing at the point of connection of the tapped inductor and the filter inductor and a D.C. sense signal taken from the output of the switching circuit to the inverting input of the linear differential amplifier.
Claim 4
Dependent Claim
163 words
An improved switching circuit for deriving a regulated D.C. voltage from a source of unregulated D.C. voltage, said switching circuit being of the type havng at least a switching transistor, an associated driver transistor, a linear differential amplifier with an inverting input for sensing the output signal at an output of the switching circuit, with a non-inverting input for sensing a source of reference potential, and with an output for driving the switching and driver transistors, and a tapped inductor connected between the collector of the switching transistor and the output of the switching circuit, wherein the improvement comprises a filter inductor interposed between the tapped inductor and the output of the switching circuit and associated means for coupling a feedback signal comprising both a ripple signal appearing at the point of connection of the tapped inductor and the filter inductor and a D.C. sense signal taken from the output of the switching circuit to the inverting input of the linear differential amplifier.
Claim 5
Dependent Claim
117 words
An improved switching circuit for deriving a regulated D.C. voltage from a source of unregulated D.C. voltage, said circuit being of the type having at least a switching transistor, an associated driver transistor, and a linear differential amplifier with an inverting input for sensing the output voltage at an output of the switching circuit, with a non-inverting input for sensing a source of reference potential, and with an output for driving the switching and driver transistors, wherein the improvement comprises a transformer having a first winding serially connected in an output lead of the switching circuit and a second winding connected between the output of the switching circuit and the inverting input of the linear differential amplifier.
Claim 6
Dependent Claim
117 words
An improved switching circuit for deriving a regulated D.C. voltage from a source of unregulated D.C. voltage, said circuit being of the type having at least a switching transistor, an associated driver transistor, and a linear differential amplifier with an inverting input for sensing the output voltage at an output of the switching circuit, with a non-inverting input for sensing a source of reference potential, and with an output for driving the switching and driver transistors, wherein the improvement comprises a transformer having a first winding serially connected in an output lead of the switching circuit and a second winding connected between the output of the switching circuit and the inverting input of the linear differential amplifier.
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) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |