Patent US4025862A successfully refreshed from Google Patents.
US4025862A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power supply with chopping circuit
Assignee: Telemecanique SA
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Filing: 1975-12-04
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Granted: 1977-05-24
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Expires: 1995-12-04
Abstract
Abstract An improved power supply apparatus for providing a stabilized low voltage d.c. output from the a.c. mains, comprises two distinct chopper stages, each having its regulation control loop which operates by duty cycle control. The first loop includes a current limiter and provides a rough regulation of the output voltage as a function of the mains variations, whereas the second loop provides a fine regulation of the output voltage as a function of the load variations, and isolation with respect to the load.
Inventors
- 👤 Jean-Francois Gautheron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:03
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/337; H02M3/3372; H02M3/3374
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
265 words
A power supply apparatus for providing a stabilised direct current output from an alternating current input, comprising: input filtering and rectifying means connected to the alternating current input and producing a rectified and filtered output, first chopper means for converting said rectified and filtered output to a periodic square wave signal having a variable mark-to-space ratio, said first chopper means having a control input and an output; first auxiliary rectifying and filtering means connected at the output of the first chopper means; second push-pull mounted chopper means connected to the first auxiliary rectifying and filtering means and providing a further square-wave signal having a variable mark-to-space ratio and a fixed repetition rate, said second chopper means having a control input and an output, a transformer having a primary winding connected to the output of the second chopper means and a secondary winding; output filtering and rectifying means connected to the secondary winding of the transformer; comparator means connected to the output of the first chopper means and to a reference voltage source for comparing the variations of the said square wave signal to a reference voltage and providing a control square wave signal having a variable mark-to-space ratio; means connecting the control square wave signal to the control input of the first chopper means; and further comparator means for comparing the variations of the stabilised direct current output to a further reference voltage and providing a further control square wave signal having a variable mark-to-space ratio and means connecting the said further control square wave signal to the control input of the second chopper means.
Claim 2
Dependent Claim
265 words
A power supply apparatus for providing a stabilised direct current output from an alternating current input, comprising: input filtering and rectifying means connected to the alternating current input and producing a rectified and filtered output, first chopper means for converting said rectified and filtered output to a periodic square wave signal having a variable mark-to-space ratio, said first chopper means having a control input and an output; first auxiliary rectifying and filtering means connected at the output of the first chopper means; second push-pull mounted chopper means connected to the first auxiliary rectifying and filtering means and providing a further square-wave signal having a variable mark-to-space ratio and a fixed repetition rate, said second chopper means having a control input and an output, a transformer having a primary winding connected to the output of the second chopper means and a secondary winding; output filtering and rectifying means connected to the secondary winding of the transformer; comparator means connected to the output of the first chopper means and to a reference voltage source for comparing the variations of the said square wave signal to a reference voltage and providing a control square wave signal having a variable mark-to-space ratio; means connecting the control square wave signal to the control input of the first chopper means; and further comparator means for comparing the variations of the stabilised direct current output to a further reference voltage and providing a further control square wave signal having a variable mark-to-space ratio and means connecting the said further control square wave signal to the control input of the second chopper means.
Claim 3
Dependent Claim
73 words
A power supply apparatus as claimed in claim 1, wherein said means connecting the control square wave signal to the control input of the chopper means include gating means having an inhibiting input, said apparatus further comprising current limiter means connected to the input filtering and rectifying means for applying an inhibiting signal on the inhibiting input of the gating means each time the said rectified and filtered output exceeds a predetermined value.
Claim 4
Dependent Claim
103 words
A power supply apparatus as claimed in claim 1, wherein the further comparator means include means for comparing the stabilised direct current output to a said reference voltage and providing a direct current error signal; light emitting means connected to said direct current error signal; light sensitive means cooperating with said light emitting means to provide a further direct current error signal; means generating a saw-tooth wave signal having the same repetition rate as the said further square-wave signal; and means for comparing the further direct current error signal and of the saw-tooth wave signal to provide the said further square-wave control signal.
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) | 1980-05-23 | 1980-11-22 | 1981-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-23 | 1984-11-22 | 1985-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-23 | 1988-11-22 | 1989-05-24 | $7700.00 | Window Closed / Lapsed |