US3742371A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wide range regulated power supply utilizing optimized energy storage
Assignee: Tektronix Inc
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Filing: 1971-12-16
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Granted: 1973-06-26
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Expires: 1991-12-16
Abstract
Abstract A fly-back type power supply includes a transformer, the primary winding of which is periodically connected to a DC source to establish current through such winding. When this current increases to a predetermined optimum value, the current flow through the primary winding is interrupted for producing collapse of the transformer''s magnetic field and generation of an output in the transformer''s secondary windings. The frequency at which the primary is periodically connected to the DC source is controlled by a secondary output voltage such that the frequency is increased when such output voltage tends to decrease. A plurality of secondary windings are each connected to a rectifier and filter capacitor combination, wherein the filter capacitors are coupled in series for production of a high voltage output.
Inventors
- 👤 A Seibt
- 👤 F Churchill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:53
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/33507; H02M3/33523
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
218 words
A power supply comprising: a transformer having a primary winding means and secondary winding means; a DC input source; a control device serially interposed between said DC input source and said primary winding means; a current sensing transformer having a primary winding connected in series with said primary winding means and said control device, said current sensing transformer also having a secondary winding; a control circuit for operating said control device to thereby couple current from said input source to said primary winding means and to the primary of said current sensing transformer; oscillator means for periodically operating said control circuit; said control circuit being responsive to the output of the secondary of said current sensing transformer to discontinue operation of said control device when the current in the primary of said current sensing transformer reaches a predetermined value for interrupting such current and initiating collapse of the field established in said transformer; and a damper winding on said first mentioned transformer operated by said control circuit for heavily loading said first mentioned transformer after the collapse of the field in said first mentioned transformer subsequent to the interruption of current in said primary winding means and before said control circuit again operates said control device to couple current from said input source to said primary winding means.
Claim 2
Dependent Claim
218 words
A power supply comprising: a transformer having a primary winding means and secondary winding means; a DC input source; a control device serially interposed between said DC input source and said primary winding means; a current sensing transformer having a primary winding connected in series with said primary winding means and said control device, said current sensing transformer also having a secondary winding; a control circuit for operating said control device to thereby couple current from said input source to said primary winding means and to the primary of said current sensing transformer; oscillator means for periodically operating said control circuit; said control circuit being responsive to the output of the secondary of said current sensing transformer to discontinue operation of said control device when the current in the primary of said current sensing transformer reaches a predetermined value for interrupting such current and initiating collapse of the field established in said transformer; and a damper winding on said first mentioned transformer operated by said control circuit for heavily loading said first mentioned transformer after the collapse of the field in said first mentioned transformer subsequent to the interruption of current in said primary winding means and before said control circuit again operates said control device to couple current from said input source to said primary winding means.
Claim 3
Dependent Claim
31 words
The circuit according to claim 1 wherein said input source comprises a rectifier for receiving an alternating current input and for providing a direct current output to said primary winding means.
Claim 4
Dependent Claim
47 words
The circuit according to claim 1 wherein said oscillator means is responsive in its frequency of operation to a voltage derived from said secondary winding means for increasing the frequency of operation of said oscillator as said voltage derived from said secondary winding means tends to decrease.
Claim 5
Dependent Claim
68 words
The circuit according to claim 3 including means for coupling a load to the secondary of the first mentioned transformer comprising rectifier means in series with said secondary winding means and filter means for developing an output voltage; said oscillator means further including a comparator means for comparing said voltage derived from said secondary winding means with a reference for controlling said oscillator in accordance with such comparison.
Claim 6
Dependent Claim
70 words
The circuit according to claim 3 wherein said oscillatormeans operates at frequencies which allow a period of nonconduction between periodic operations, said period of nonconduction having a time duration ufficient for allowing variation in the time interval current from said input source and through said primary of said current sensing primary flows in order that said current can reach said predetermined value during said interval, before the next periodic operation.
Claim 7
Dependent Claim
81 words
The circuit according to claim 3 wherein said secondary winding means comprises a plurality of output windings, said circuit further including means for coupling a load to said first transformer comprising a filter means associated with each said output winding, and rectifier means coupling each such filter means to the associated output winding; and means connecting said filter means in series-aiding rElation to provide a high voltage output in response to periodic collapse of the field established in said first transformer.
Claim 8
Dependent Claim
27 words
The circuit according to claim 6 further including a dissipative voltage regulator means for coupling the series connection of said filter means to a high voltage load.
Claim 9
Dependent Claim
41 words
The circuit according to claim 1, further including a holdoff winding on said transformer coupled to said control circuit for preventing conductive operation of said control device during the collapse of the field in said transformer after interruption of said current.
Claim 10
Dependent Claim
14 words
The circuit according to claim 1 wherein said control device comprises a power transistor.
Claim 11
Dependent Claim
63 words
The circuit according to claim 1 further including first means in said control circuit for energizing said control device in response to an input from said oscillator means, said first means being adapted to operate for a variable period until shut off, and means also responsive to the output from the secondary of said current sensing transformer for turning off said first means.
Claim 12
Dependent Claim
14 words
The circuit according to claim 1 wherein said control device is a power transistor.
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) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |