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US3675158A
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US
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Self-oscillating switching regulator with secondary switching control signal to regulate switching frequency
Assignee: AT&T Inc
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Filing: 1970-12-21
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Granted: 1972-07-04
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Expires: 1990-12-21
Abstract
Abstract A self-oscillating switching regulator is frequency regulated by the introduction of secondary switching control signals into the voltage regulation feedback loop to delay switching of the switching device. The secondary switching control signal is generated by a monostable circuit with a frequency responsive time constant. The secondary switching control signal comprises a variable duration pulse signal. This pulse signal is tacked onto the trailing edge of the conventional switching control signal and hence extends the duration of the control signal applied to the switching device. The switching delay introduced by the secondary control signal directly regulates the switching frequency of the switching regulator.
Inventors
- 👤 Frank Fuller Judd
- 👤 Helmut Wilhart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:28
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/02; H02M3/04; H02M3/10; H02M3/145; H02M3/155; H02M3/156
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
118 words
A self-oscillating switching regulator to derive a regulated voltage from an unregulated voltage source comprising an input and an output, a switching device coupling said input and output, a voltage regulation feedback loop to control said switching device, a bistable trigger circuit with complementary dual outputs included in said feedback loop, one of said complementary outputs being coupled to said switching device, a monostable circuit with its trigger input connected to the other one of said complementary outputs, and its output coupled to said switching device, a frequency-to-voltage converter responsive to the switching frequency of said switching device, and means to control the duration of the signal output of said monostable circuit in response to said frequency-to-voltage converter.
Claim 2
Dependent Claim
118 words
A self-oscillating switching regulator to derive a regulated voltage from an unregulated voltage source comprising an input and an output, a switching device coupling said input and output, a voltage regulation feedback loop to control said switching device, a bistable trigger circuit with complementary dual outputs included in said feedback loop, one of said complementary outputs being coupled to said switching device, a monostable circuit with its trigger input connected to the other one of said complementary outputs, and its output coupled to said switching device, a frequency-to-voltage converter responsive to the switching frequency of said switching device, and means to control the duration of the signal output of said monostable circuit in response to said frequency-to-voltage converter.
Claim 3
Dependent Claim
51 words
A self-oscillating switching regulator as defined in claim 1 wherein said monostable circuit includes an energy storage device to control timing of the pulse output, and said means to control the duration comprises a controllable impedance responsive to said frequency-to-voltage converter and coupling said voltage source to said energy storage device.
Claim 4
Dependent Claim
41 words
A self-oscillating switching regulator as defined in claim 2 wherein said controllable impedance comprises a transistor and further includes a differential amplifier having one input responsive to said frequency-to-voltage converter and its output connected to the control electrode of said transistor.
Claim 5
Dependent Claim
36 words
A self-oscillating switching regulator as defined in claim 3 further including a NOR gate to couple the output of said monostable circuit and the one complementary output of said bistable trigger circuit to said switching device.
Claim 6
Dependent Claim
131 words
A self-oscillating switching regulator comprising input and output terminals, a switching device coupling said input and output terminals and including a control electrode to control switching, a feedback loop coupling said output terminal to said electrode including means to generate a switching signal to control the switching of said switching device in order to regulate the voltage at said output terminal, means to inject a variable delay pulse into said feedback loop to delay the switching of said switching device and including a frequency-to-voltage converter responsive to said switching device, a pulse generator to generate a pulse whose duration is responsive to the voltage output of said converter, and gating means responsive to said feedback loop to apply said pulse to said electrode at the trailing edge of said switching signal.
Claim 7
Dependent Claim
131 words
A self-oscillating switching regulator comprising input and output terminals, a switching device coupling said input and output terminals and including a control electrode to control switching, a feedback loop coupling said output terminal to said electrode including means to generate a switching signal to control the switching of said switching device in order to regulate the voltage at said output terminal, means to inject a variable delay pulse into said feedback loop to delay the switching of said switching device and including a frequency-to-voltage converter responsive to said switching device, a pulse generator to generate a pulse whose duration is responsive to the voltage output of said converter, and gating means responsive to said feedback loop to apply said pulse to said electrode at the trailing edge of said switching signal.
Claim 8
Dependent Claim
72 words
A self-oscillating switching regulator as defined in claim 5 wherein said pulse generator comprises a monostable circuit including two cross-coupled gate devices and an energy storage device coupling the output of one of said cross-coupled gate devices to the input of the other cross-coupled gate device, and said switching regulator further including means to control the rate of the storage of energy in said energy storage device responsive to said frequency-to-voltage converter.
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) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |