US3758840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power supply utilizing improved voltage regulation
Assignee: HP Inc
•
Filing: 1972-05-15
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Granted: 1973-09-11
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Expires: 1992-05-15
Abstract
Abstract A high efficiency, AC-to-DC power supply is provided in which a preregulator circuit including a rectifier bridge is coupled to an AC supply input. Two switching rectifiers, one in each of two arms of the bridge, are controlled by a preregulator control circuit for regulating the turn on time of the bridge and thus the DC output level thereof. An inverter circuit is coupled to the output of the bridge for converting the DC output therefrom to an AC signal with a frequency substantially higher than the AC supply input and with an amplitude dependent on the DC output level of the bridge. The output of the inverter circuit is coupled by a transformer to a rectifier circuit for developing a DC output dependent on the amplitude of the AC signal from the inverter circuit. A flux sensing circuit is coupled to the transformer for developing a feedback control signal dependent on the transformer flux density. The preregulator control circuit includes means responsive to this feedback control signal for controlling the turn on time of the switching rectifiers to thereby control the DC level at the bridge output and maintain a constant flux density in the transformer. In addition, the power supply includes means responsive to the load current for controlling the gain of the feedback loop to maintain a stable loop with fast response time.
Inventors
- 👤 B Oliver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:18
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/02; H02M7/04; H02M7/12; H02M7/145; H02M7/155; H02M7/162; H02M7/1623; H02M7/1626; H02M7/42; H02M7/44; H02M7/48; H02M7/53; H02M7/537
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
245 words
A DC power supply for converting AC voltage on an input supply line to a plurality of separate DC voltages, said DC power supply comprising: a rectifier bridge circuit including controlled rectifier switches, having an input connected across the input supply line, and being operable for producing a DC voltage at an output of the rectifier bridge circuit; a first inverter circuit coupled to the output of the rectifier bridge circuit for receiving the DC voltage produced by the rectifier bridge circuit; drive means coupled to the first inverter circuit for operating it at a selected alternating rate substantially higher than the alternating rate of the AC voltage on the input supply line to produce an AC voltage at an output of the first inverter circuit; an output rectifier circuit including a first transformer and being coupled to the output of the first inverter circuit via the first transformer for converting the AC voltage produced by the first inverter circuit to a plurality of separate DC voltages provided at a plurality of separate outputs of the output rectifier circuit; flux sensing means for sensing the flux in the first transformer; and a control circuit coupled to the controlled rectifier switches and responsive to the flux sensed in the first transformer for controlling the turn-on time of the controlled rectifier switches and thereby maintaining a constant flux density in the first transformer to regulate the DC voltages provided at the outputs of the output rectifier circuit.
Claim 2
Dependent Claim
245 words
A DC power supply for converting AC voltage on an input supply line to a plurality of separate DC voltages, said DC power supply comprising: a rectifier bridge circuit including controlled rectifier switches, having an input connected across the input supply line, and being operable for producing a DC voltage at an output of the rectifier bridge circuit; a first inverter circuit coupled to the output of the rectifier bridge circuit for receiving the DC voltage produced by the rectifier bridge circuit; drive means coupled to the first inverter circuit for operating it at a selected alternating rate substantially higher than the alternating rate of the AC voltage on the input supply line to produce an AC voltage at an output of the first inverter circuit; an output rectifier circuit including a first transformer and being coupled to the output of the first inverter circuit via the first transformer for converting the AC voltage produced by the first inverter circuit to a plurality of separate DC voltages provided at a plurality of separate outputs of the output rectifier circuit; flux sensing means for sensing the flux in the first transformer; and a control circuit coupled to the controlled rectifier switches and responsive to the flux sensed in the first transformer for controlling the turn-on time of the controlled rectifier switches and thereby maintaining a constant flux density in the first transformer to regulate the DC voltages provided at the outputs of the output rectifier circuit.
Claim 3
Dependent Claim
71 words
A DC power supply as in claim 1 wherein said flux sensing means comprises: means coupled to a secondary winding of the first transformer for sensing the voltage across the secondary winding in the unloaded condition with no load current flowing therein; and means for producing a feedback signal from the voltage sensed across the secondary winding of the first transformer to control the turn-on time of the controlled rectifier switches.
Claim 4
Dependent Claim
214 words
A DC power supply as in claim 1 wherein: said DC power supply includes a second inverter circuit coupled to the output of the rectifier bridge circuit; said drive means is coupled to the second inverter circuit for operating it at the selected alternating rate to produce an AC voltage at an output of the second inverter circuit, the AC voltage produced at the output of the second inverter circuit being out-of-phase with respect to the AC voltage produced at the output of the first inverter circuit; said Output rectifier circuit also includes a second transformer and is coupled to the outputs of both the first and second inverter circuits via the first and second transformers, respectively, for converting the AC voltages produced by the first and second inverter circuits to the DC voltages provided at the output of the output rectifier circuit; said flux sensing means is operable for sensing the flux in both the first and second transformers; and said control circuit is responsive to the flux sensed in both the first and second transformers for controlling the turn-on time of the controlled rectifier switches and thereby maintaining a constant flux density in the first and second transformers to regulate the DC voltages provided at the outputs of the output rectifier circuit.
Claim 5
Dependent Claim
15 words
A DC power supply as in claim 1 wherein said controlled rectifier switches are SCR''s.
Claim 6
Dependent Claim
219 words
A DC power supply for converting incoming AC voltage on an input supply line to a plurality of separate output DC voltages for associated load circuits, said DC power supply comprising: a preregulator including a rectifier bridge circuit for converting the incoming AC voltage to a DC voltage provided at an output of the preregulator, said rectifier bridge circuit including controlled rectifier switches; conversion means coupled to the output of the preregulator for converting the DC voltage provided at the output of the preregulator to an AC voltage and for subsequently converting this AC voltage into a plurality of separate output DC voltages provided at a plurality of separate outputs of the conversion means; a control circuit for controlling the turn-on time of the controlled rectifier switches and thereby regulating the level of the DC voltage provided at the output of the preregulator, said control circuit including an amplifier and being responsive to changes in the incoming AC voltage for changing the turn-on time of the controlled rectifier switches; and feedback means coupled to the control circuit and responsive to load current variations at the outputs of the conversion means for providing a feedback signal to adjust the gain of the amplifier and provide optimum gain crossover in the regulation loop comprising the preregulator, conversion means, and control circuit.
Claim 7
Dependent Claim
219 words
A DC power supply for converting incoming AC voltage on an input supply line to a plurality of separate output DC voltages for associated load circuits, said DC power supply comprising: a preregulator including a rectifier bridge circuit for converting the incoming AC voltage to a DC voltage provided at an output of the preregulator, said rectifier bridge circuit including controlled rectifier switches; conversion means coupled to the output of the preregulator for converting the DC voltage provided at the output of the preregulator to an AC voltage and for subsequently converting this AC voltage into a plurality of separate output DC voltages provided at a plurality of separate outputs of the conversion means; a control circuit for controlling the turn-on time of the controlled rectifier switches and thereby regulating the level of the DC voltage provided at the output of the preregulator, said control circuit including an amplifier and being responsive to changes in the incoming AC voltage for changing the turn-on time of the controlled rectifier switches; and feedback means coupled to the control circuit and responsive to load current variations at the outputs of the conversion means for providing a feedback signal to adjust the gain of the amplifier and provide optimum gain crossover in the regulation loop comprising the preregulator, conversion means, and control circuit.
Claim 8
Dependent Claim
178 words
A DC power supply as in claim 5 wherein: said conversion means includes a first inverter circuit, a plurality of full wave rectifier circuits coupled to the outputs of the conversion means, and a first transformer including a primary winding coupled to an output of the first inverter circuit and including a plurality of secondary windings coupled to the full wave rectifier circuits; said conversion means further includes drive means coupled to the first inverter circuit for operating it at a selected alternating rate substantially higher than the alternating rate of the incoming AC voltage on the input supply line to produce an AC voltage at the output of the first inverter circuit; said power supply includes flux sensing means for sensing the flux in the first transformer; and said control circuit includes means responsive to the flux sensed in the first transformer for controlling the turn-on time of the controlled rectifier switches and thereby maintaining a constant flux density in the first transformer to regulate the output DC voltages provided at the outputs of the conversion means.
Claim 9
Dependent Claim
71 words
A DC power supply as in claim 6 wherein said flux sensing means comprises: means coupled to a secondary winding of the first transformer for sensing the voltage across the secondary winding in the unloaded condition with no load current flowing therein; and means for producing a feedback signal from the voltage sensed across the secondary winding of the first transformer to control the turn-on time of the controlled rectifier switches.
Claim 10
Dependent Claim
179 words
A DC power supply as in claim 6 wherein: said conversion means includes a second inverter circuit, and A second transformer having a primary winding coupled to an output of the second inverter circuit and having a plurality of secondary windings coupled to the full wave rectifier circuits; said drive means is coupled to the second inverter circuit for operating it at the selected alternating rate to produce an AC voltage at the output of the second inverter circuit, the AC voltage produced at the output of the second inverter circuit being out of phase with respect to the AC voltage produced at the output of the first inverter circuit; said flux sensing means is operable for sensing the flux in both the first and second tranformers; and said control circuit is responsive to the flux sensed in the first and second transformers for controlling the turn-on time of the controlled rectifier switches and thereby maintaining a constant flux density in the first and second transformers to regulate the DC voltages provided at the outputs of the conversion means.
Claim 11
Dependent Claim
15 words
A DC power supply as in claim 6 wherein said controlled rectifier switches are SCR''s.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |