Patent US3676800A successfully refreshed from Google Patents.
US3676800A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synchronized self-oscillating switching regulator
Assignee: AT&T Inc
•
Filing: 1970-12-24
•
Granted: 1972-07-11
•
Expires: 1990-12-24
Abstract
Abstract A periodic synchronizing signal of constant frequency is coupled to the feedback loop of a self-oscillating switching regulator to hold the switching frequency constant. The synchronizing signal is added directly to the feedback signal to drive the switch ON and OFF. The waveform of the synchronizing signal is not critical; a relaxation oscillator and a resonant circuit shock excited by the switching are shown as synchronizing signal sources.
Inventors
- 👤 Herbert Rudolf Weischedel
- 👤 George Raymond Westerman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:00
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/02; H02M3/04; H02M3/10; H02M3/145; H02M3/155; H02M3/156; Y; Y02; Y02B; Y02B70/00; Y02B70/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
142 words
A constant frequency switching regulator comprising a pair of input terminals for connection to a dc source, a pair of output terminals for connection to a dc load, switching means connected to said input and said output terminals for intermittently connecting at least one of said input terminals to at least one of said output terminals, a feedback loop connected between said output terminals and said switching means for driving said switching means to open and close in response to the voltage at said output terminals, said feedback loop including sufficient gain and phase shift to sustain self-oscillation in the switching of said switching means, and a source of periodic synchronizing signals of substantially constant frequency and sufficient amplitude coupled to said feedback loop to hold the switching frequency of said switching means and the voltage at said output terminals substantially constant.
Claim 2
Dependent Claim
142 words
A constant frequency switching regulator comprising a pair of input terminals for connection to a dc source, a pair of output terminals for connection to a dc load, switching means connected to said input and said output terminals for intermittently connecting at least one of said input terminals to at least one of said output terminals, a feedback loop connected between said output terminals and said switching means for driving said switching means to open and close in response to the voltage at said output terminals, said feedback loop including sufficient gain and phase shift to sustain self-oscillation in the switching of said switching means, and a source of periodic synchronizing signals of substantially constant frequency and sufficient amplitude coupled to said feedback loop to hold the switching frequency of said switching means and the voltage at said output terminals substantially constant.
Claim 3
Dependent Claim
27 words
A constant frequency switching regulator as in claim 1 wherein said source of periodic synchronizing signals derives its energy from said dc source through said switching means.
Claim 4
Dependent Claim
20 words
A constant frequency switching regulator as in claim 1 wherein said source of periodic synchronizing signals is a relaxation oscillator.
Claim 5
Dependent Claim
35 words
A constant frequency switching regulator as in claim 1 wherein the feedback signal in said feedback loop and the synchronizing signals from said source of periodic synchronizing signals are added to drive said switching means.
Claim 6
Dependent Claim
20 words
A constant frequency switching regulator as in claim 4 wherein said synchronIzing signals are capacitively coupled to said feedback loop.
Claim 7
Dependent Claim
21 words
A constant frequency switching regulator as in claim 2 wherein said source of periodic synchronizing signals is a shock-excited resonant circuit.
References Cited (Backward Citations)
US3328674A
Cited
US3577065A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |