US3736465A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage supply arrangements
Assignee: BAE Systems Electronics Ltd
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Filing: 1971-12-29
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Granted: 1973-05-29
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Expires: 1991-12-29
Abstract
Abstract An E.H.T. voltage supply system comprising a relatively high voltage d.c. supply having a relatively high output impedance and low output capacitance, a second voltage supply arranged to charge a storage capacitor, and switch means for discharging the capacitor through the primary winding of a transformer to produce a higher voltage of the secondary winding which is combined with the voltage provided by the first voltage supply means.
Inventors
- 👤 J Rowe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:29
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/305; H02M3/315
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
183 words
A display system utilizing a cathode ray tube the final anode E.H.T. voltage of which is required to be variable in steps, the said E.H.T. voltage being proVided by a voltage supply system comprising a first variable voltage supply feeding an output terminal of said supply system and capable of providing continuously current for the final anode of the cathode ray tube, control signal producing means operatively associated with said first variable voltage supply for changing its output voltage in steps, a second variable voltage supply which includes transformer means a secondary winding of which is coupled to said terminal, storage capacitor means, a d.c. for charging said storage capacitor means and switch means responsive to signals deriving from said control signal producing means for discharging said capacitor means through a winding of said transformer, thereby to alter the voltage of said second variable voltage supply rapidly and contemporaneously with said first variable voltage supply, whereby the said E.H.T. voltage is changeable rapidly due to operation of said second variable voltage supply to a level thereafter sustained by said first variable voltage supply.
Claim 2
Dependent Claim
183 words
A display system utilizing a cathode ray tube the final anode E.H.T. voltage of which is required to be variable in steps, the said E.H.T. voltage being proVided by a voltage supply system comprising a first variable voltage supply feeding an output terminal of said supply system and capable of providing continuously current for the final anode of the cathode ray tube, control signal producing means operatively associated with said first variable voltage supply for changing its output voltage in steps, a second variable voltage supply which includes transformer means a secondary winding of which is coupled to said terminal, storage capacitor means, a d.c. for charging said storage capacitor means and switch means responsive to signals deriving from said control signal producing means for discharging said capacitor means through a winding of said transformer, thereby to alter the voltage of said second variable voltage supply rapidly and contemporaneously with said first variable voltage supply, whereby the said E.H.T. voltage is changeable rapidly due to operation of said second variable voltage supply to a level thereafter sustained by said first variable voltage supply.
Claim 3
Dependent Claim
108 words
A display system as claimed in claim 1 wherein the transformer means comprises a double wound transformer having a primary winding and a secondary winding and wherein the capacitor means comprises a capacitor charged by the d.c. supply and dischargeable through the primary winding of said transformer by operation of a semiconductor switch in response to signals from the control signal producing means for increasing the said E.H.T. voltage and a further semiconductor switch and a further capacitor serially connected with the secondary winding of said transformer said further switch being responsive to further signals deriving from the control signal producing means for decreasing the said E.H.T. voltage.
Claim 4
Dependent Claim
113 words
A display system as claimed in claim 1 wherein the storage capacitor means comprises a plurality of capacitors and wherein the switch means comprises a plurality of switchable semiconductor devices one for each capacitor and wherein the transformer means comprises a plurality of primary windings one for each capacitor and a plurality of d.c. sources constituting the said d.c. supply the capacitors being arranged to be charged to the potential of said d.c. sources one capacitor to each said source and selectively discharged through their associated primary windings in response to operation of their associated semiconductor switches consequent upon the application thereto of predetermined signals deriving from the said control signal producing means.
Claim 5
Dependent Claim
62 words
A display system as claimed in claim 3 comprising an additional primary winding and wherein the switch means comprises an additional switchable semiconductor device one of said plurality of capacitors being dischargeable through said additional primary winding in response to operation of said additional switchable semiconductor device consequent upon the application thereto of a signal from the said control signal reducing means.
Claim 6
Dependent Claim
51 words
A display system as claimed in claim 3 wherein one of said plurality of capacitors is connectable to one or another of said d.c. sources in accordance with the operation of a further switchable semiconductor device responsively to the application thereto of a signal from the said control signal producing means.
Claim 7
Dependent Claim
33 words
A display system as claimed in claim 5 comprising a plurality of switchable rectifier devices serially connected with a secondary winding of said transformer means whereby rectification of said E.H.T. voltage is produced.
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) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |