US3671853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual-output regulated switching power supply
Assignee: AT&T Inc
•
Filing: 1970-12-24
•
Granted: 1972-06-20
•
Expires: 1990-12-24
Abstract
Abstract The duty cycle and frequency of a switching transistor are individually controlled by separate feedback loop to give two independently regulated output voltages. The main output is controlled by the duty cycle feedback loop in a conventional manner. The auxiliary output is fed by a frequency-to-voltage converter and has a voltage-to-frequency converter in its feedback loop.
Inventors
- 👤 Herbert Rudolf Weischedel
- 👤 George Raymond Westerman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:51
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/33561; H02M1/00; H02M1/0083; H02M1/009
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
162 words
A dual-output voltage regulator comprising input means for connection to a DC voltage source, an output circuit, switching means for connecting said input means to said output circuit, driving means connected to said switching means for alternately opening and closing said switching means, first output means including a first output terminal coupled to said output circuit for providing a first output voltage responsive to the duty cycle of said switching means, second output means including a second output terminal coupled to said output circuit for providing a second output voltage responsive to the switching frequency of said switching means, duty cycle feedback means connected from said first output terminal to said driving means for adjusting the duty cycle of said switching means to regulate the voltage at said first output terminal, and frequency feedback means connected from said second output terminal to said driving means for adjusting the frequency of said switching means to regulate the voltage at said second output terminal.
Claim 2
Dependent Claim
162 words
A dual-output voltage regulator comprising input means for connection to a DC voltage source, an output circuit, switching means for connecting said input means to said output circuit, driving means connected to said switching means for alternately opening and closing said switching means, first output means including a first output terminal coupled to said output circuit for providing a first output voltage responsive to the duty cycle of said switching means, second output means including a second output terminal coupled to said output circuit for providing a second output voltage responsive to the switching frequency of said switching means, duty cycle feedback means connected from said first output terminal to said driving means for adjusting the duty cycle of said switching means to regulate the voltage at said first output terminal, and frequency feedback means connected from said second output terminal to said driving means for adjusting the frequency of said switching means to regulate the voltage at said second output terminal.
Claim 3
Dependent Claim
35 words
A dual-output voltage regulator as in claim 1 wherein said output circuit includes a tapped inductor connected between said switching means and said first output terminal having a tap connected to said second output means.
Claim 4
Dependent Claim
26 words
A dual-output voltage regulator as in claim 1 including a source of reference voltage common to said duty cycle feedback means and said frequency feedback means.
Claim 5
Dependent Claim
30 words
A dual-output voltage regulator as in claim 1 wherein said duty cycle feedback means includes sufficient gain and phase shift to sustain self-oscillation in the switching of said switching means.
Claim 6
Dependent Claim
31 words
A dual-output voltage regulator as in claim 4 wherein the feedback signals produced by said duty cycle feedback means and said frequency feedback means are added to produce one driving signal.
Claim 7
Dependent Claim
227 words
A dual-output voltage regulator comprising input means for connection to a DC voltage source, an output circuit, switching means for connecting said input means to said output circuit, driving means connected to said switching means for alternately opening and closing said switching means, first output means including a first output terminal coupled to said output circuit for providing a first output voltage responsive to the duty cycle of said swItching means, second output means including a second output terminal coupled to said output circuit for providing a second output voltage responsive to the switching frequency of said switching means, duty cycle feedback means connected from said first output terminal to said driving means for adjusting the duty cycle of said switching means to regulate the voltage at said first output terminal, and frequency feedback means connected from said second output terminal to said driving means for adjusting the frequency of said switching means to regulate the voltage at said second output terminal, said frequency feedback means comprising an error detector connected to said second output terminal for producing an error voltage proportional to the amount by which the voltage at said second output terminal exceeds a predetermined value, and frequency generating means connected between said error detector and said driving means for emitting a periodic signal having a frequency that varies in response to said error voltage.
Claim 8
Dependent Claim
227 words
A dual-output voltage regulator comprising input means for connection to a DC voltage source, an output circuit, switching means for connecting said input means to said output circuit, driving means connected to said switching means for alternately opening and closing said switching means, first output means including a first output terminal coupled to said output circuit for providing a first output voltage responsive to the duty cycle of said swItching means, second output means including a second output terminal coupled to said output circuit for providing a second output voltage responsive to the switching frequency of said switching means, duty cycle feedback means connected from said first output terminal to said driving means for adjusting the duty cycle of said switching means to regulate the voltage at said first output terminal, and frequency feedback means connected from said second output terminal to said driving means for adjusting the frequency of said switching means to regulate the voltage at said second output terminal, said frequency feedback means comprising an error detector connected to said second output terminal for producing an error voltage proportional to the amount by which the voltage at said second output terminal exceeds a predetermined value, and frequency generating means connected between said error detector and said driving means for emitting a periodic signal having a frequency that varies in response to said error voltage.
Claim 9
Dependent Claim
29 words
A dual-output voltage regulator as in claim 6 wherein said frequency generating means comprises a relaxation oscillator having a breakdown voltage that varies in response to said error voltage.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |