US3781646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Current supply comprising an asymmetric rectifier arrangement
Assignee: US Philips Corp
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Filing: 1972-10-03
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Granted: 1973-12-25
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Expires: 1992-10-03
Abstract
Abstract Full-wave rectified current supply comprising a single thyristor the gate electrode of which is connected to an electronic control circuit, which supply is connected to a direct-current motor. Varying the conduction angle of the thyristor enables torques of different values to be obtained in order to achieve regulation of the speed of the motor. Applications: direct-current motors, washing machines, etc.
Inventors
- 👤 J Dheilly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:10
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/02; H02M7/04; H02M7/12; H02M7/145; H02M7/155; H02M7/162; H02M7/1623
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
147 words
A power supply for supplying full-wave rectified current to a DC motor comprising, a pair of supply input terminals for connection to a source of AC voltage, a full-wave rectifier bridge circuit with input terminals coupled to said supply terminals and output terminals coupled to said motor, said bridge circuit including a single controlled rectifier element in one arm of the bridge and a diode in a second arm of the bridge, said bridge further comprising asymmetrical impedance means arranged so that the maximum amplitudes of the rectified currents that the bridge can supply to the motor during alternate half cycles of the AC input voltage are substantially different, a source of reference voltAge, and means for coupling said reference voltage and the motor terminal voltage cathode electrodes of the controlled rectifier so that the conduction period of the controlled rectifier is determined by the motor voltage.
Claim 2
Dependent Claim
147 words
A power supply for supplying full-wave rectified current to a DC motor comprising, a pair of supply input terminals for connection to a source of AC voltage, a full-wave rectifier bridge circuit with input terminals coupled to said supply terminals and output terminals coupled to said motor, said bridge circuit including a single controlled rectifier element in one arm of the bridge and a diode in a second arm of the bridge, said bridge further comprising asymmetrical impedance means arranged so that the maximum amplitudes of the rectified currents that the bridge can supply to the motor during alternate half cycles of the AC input voltage are substantially different, a source of reference voltAge, and means for coupling said reference voltage and the motor terminal voltage cathode electrodes of the controlled rectifier so that the conduction period of the controlled rectifier is determined by the motor voltage.
Claim 3
Dependent Claim
65 words
A power supply as claimed in claim 1 wherein said asymmetrical impedance means comprises the secondary winding of a transformer which has an asymmetrical tap point forming one output terminal of the bridge and which divides said secondary winding into two unequal windings each of which forms an arm of the bridge circuit, said transformer including a primary winding coupled to the AC voltage source.
Claim 4
Dependent Claim
30 words
A power supply as claimed in claim 1 wherein the bridge circuit is supplied from an auto-transformer having a secondary winding with an asymmetrical tap point coupled to the motor.
Claim 5
Dependent Claim
26 words
A power supply as claimed in claim 1 further comprising second and third diodes connected in the third and fourth arms, respectively, of the bridge circuit.
Claim 6
Dependent Claim
20 words
A power supply as claimed in claim 4 further comprising a resistor connected in one arm of the bridge circuit.
Claim 7
Dependent Claim
26 words
A power supply as claimed in claim 1 further comprising first and second resistors connected in the third and fourth arms, respectively, of the bridge circuit.
Claim 8
Dependent Claim
21 words
A power supply as claimed in claim 6 wherein the resistance values of said first and second resistors are substantially unequal.
Claim 9
Dependent Claim
30 words
A power supply as claimed in claim 1 further comprising a second diode and a resistor which together with the controlled rectifier and the first diode form said bridge circuit.
Claim 10
Dependent Claim
62 words
A full-wave rectified current supply comprising, a transformer having a primary winding coupled to a source of AC voltage and a secondary winding having an asymmetrical tap that divides the secondary into two unequal windings, and a full-wave rectifier circuit coupling the two secondary windings to a load, said rectifier circuit including a single controlled rectifier for controlling the full-wave rectified current.
Claim 11
Dependent Claim
62 words
A full-wave rectified current supply comprising, a transformer having a primary winding coupled to a source of AC voltage and a secondary winding having an asymmetrical tap that divides the secondary into two unequal windings, and a full-wave rectifier circuit coupling the two secondary windings to a load, said rectifier circuit including a single controlled rectifier for controlling the full-wave rectified current.
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) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |