US3840797A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Related power supply
Assignee: United States Department of the Navy
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Filing: 1970-12-28
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Granted: 1974-10-08
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Expires: 1990-12-28
Abstract
Abstract A solid-state high-voltage regulation circuit for devices such as television receivers which incorporate a flyback transformer. Voltage changes across the transformer secondary winding are compared to a stable reference, and any difference is amplified and applied to control the flow of current to the transformer primary coil. The output voltage is thus maintained essentially constant.
Inventors
- 👤 C Aggen
- 👤 H Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:57
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/33507
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
283 words
In a d.c. power supply of the type in which a cyclicallyvarying voltage is stepped up by a transformer having primary and secondary windings and then applied to a load through a rectifier, and in which the value of the voltage appearing across said load is subject to change due to variations in load current, the improvement which comprises: means for connecting the input of said power supply to a cyclically-varying voltage; means for stabilizing the value of the voltage appearing across said load regardless of variations in the current therethrough, said means including: means connected directly to a tap on the secondary winding of said transformer for sensing changes in the voltage output of said transformer due to variations in load; a first operational amplifier having its inverting input connected to the output of said voltage sensing means whereby said amplifier functions as a high-gain inverting amplifier; a parallel resistance-capacitance network connected between the input and output of said operational amplifier to limit the bandwidth for maximum circuit stability; means for limiting the output current to a desired value, said means including: current sampling means connected to the return end of said transformer secondary; a second operational amplifier having its non-inverting input connected to the output of the current sampling means; a power transistor interposed between the primary of said transformer and said cyclically-varying voltage; and means for applying the output of the first and second operational amplifiers to the power transistor, said means comprising; an OR gate connected to the output of said first and second operational amplifiers; and a power amplifier connected between the OR gate and power transistor whereby the passage of the cyclically-varying voltage and current is controlled.
Claim 2
Dependent Claim
283 words
In a d.c. power supply of the type in which a cyclicallyvarying voltage is stepped up by a transformer having primary and secondary windings and then applied to a load through a rectifier, and in which the value of the voltage appearing across said load is subject to change due to variations in load current, the improvement which comprises: means for connecting the input of said power supply to a cyclically-varying voltage; means for stabilizing the value of the voltage appearing across said load regardless of variations in the current therethrough, said means including: means connected directly to a tap on the secondary winding of said transformer for sensing changes in the voltage output of said transformer due to variations in load; a first operational amplifier having its inverting input connected to the output of said voltage sensing means whereby said amplifier functions as a high-gain inverting amplifier; a parallel resistance-capacitance network connected between the input and output of said operational amplifier to limit the bandwidth for maximum circuit stability; means for limiting the output current to a desired value, said means including: current sampling means connected to the return end of said transformer secondary; a second operational amplifier having its non-inverting input connected to the output of the current sampling means; a power transistor interposed between the primary of said transformer and said cyclically-varying voltage; and means for applying the output of the first and second operational amplifiers to the power transistor, said means comprising; an OR gate connected to the output of said first and second operational amplifiers; and a power amplifier connected between the OR gate and power transistor whereby the passage of the cyclically-varying voltage and current is controlled.
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) | 1977-10-07 | 1978-04-08 | 1978-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-07 | 1982-04-08 | 1982-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-07 | 1986-04-08 | 1986-10-08 | $7700.00 | Window Closed / Lapsed |