US4677366A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unity power factor power supply
Assignee: Pioneer Magnetics Inc
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Filing: 1986-05-12
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Granted: 1987-06-30
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Expires: 2006-05-12
Abstract
Abstract A unity power factor power supply which includes a boost converter connected to the alternating current line which is controlled to draw sinusoidal current from the line by operating as a current regulator having a current reference control signal which tracks the line voltage waveform, thereby to minimize the required input current for a given power output.
Inventors
- 👤 Bruce L. Wilkinson
- 👤 Josh Mandelcorn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:38
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/42; H02M1/4208; H02M1/4225; H02M3/00; H02M3/02; H02M3/04; H02M3/10; H02M3/145; H02M3/155; H02M3/156; Y; Y02; Y02B; Y02B70/00; Y02B70/10; Y02P; Y02P80/00; Y02P80/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
273 words
In a switched power supply: a rectifier adapted to be connected to the alternating current line; a boost converter connected to the output of said rectifier, said converter including an input circuit having a series-connected inductance coil and an output circuit having a shunt-connected storage capacitor, and further including a power switch connected between the inductance coil and the storage capacitor; and a control circuit connected to said power switch for providing a switching control signal for said converter having a current reference which tracks the waveform of the alternating current line voltage to cause the power supply to exhibit unity power factor to the alternating current line, said control circuit including a voltage error amplifier connected to the output of said converter and to a source of reference voltage for producing an output which is a function of the difference between the output voltage of the converter and the reference voltage from the source, a switching analog multiplier circuit connected to the output of said voltage error amplifier and to the output of said rectifier to produce an output which is proportional to the output of said voltage error amplifier multiplied by the instantaneous line voltage and divided by the RMS line voltage squared, a current regulator amplifier connected to the converter and to the multiplier and responsive to a voltage representing the current flow in the converter and to the output of the multiplier for producing a current error signal, and circuit means including a pulse-width modulator connected to said current regulator amplifier and responsive to said current error signal therefrom for introducing said switching control signal to said power switch.
Claim 2
Dependent Claim
273 words
In a switched power supply: a rectifier adapted to be connected to the alternating current line; a boost converter connected to the output of said rectifier, said converter including an input circuit having a series-connected inductance coil and an output circuit having a shunt-connected storage capacitor, and further including a power switch connected between the inductance coil and the storage capacitor; and a control circuit connected to said power switch for providing a switching control signal for said converter having a current reference which tracks the waveform of the alternating current line voltage to cause the power supply to exhibit unity power factor to the alternating current line, said control circuit including a voltage error amplifier connected to the output of said converter and to a source of reference voltage for producing an output which is a function of the difference between the output voltage of the converter and the reference voltage from the source, a switching analog multiplier circuit connected to the output of said voltage error amplifier and to the output of said rectifier to produce an output which is proportional to the output of said voltage error amplifier multiplied by the instantaneous line voltage and divided by the RMS line voltage squared, a current regulator amplifier connected to the converter and to the multiplier and responsive to a voltage representing the current flow in the converter and to the output of the multiplier for producing a current error signal, and circuit means including a pulse-width modulator connected to said current regulator amplifier and responsive to said current error signal therefrom for introducing said switching control signal to said power switch.
Claim 3
Dependent Claim
43 words
The combination defined in claim 1, in which said multiplier is a switching type, and in which said control circuit includes a timer and ramp signal generator for supplying clock signals to said switching multiplier and ramp signals to said pulse width modulator.
Claim 4
Dependent Claim
16 words
The combination defined in claim 1, in which said power switch comprises a field effect transistor.
Claim 5
Dependent Claim
15 words
The combination defined in claim 1, in which said rectifier comprises a full-wave diode rectifier.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-06-29 | 1990-12-29 | 1991-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-29 | 1994-12-29 | 1995-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-29 | 1998-12-29 | 1999-06-30 | $7700.00 | Window Closed / Lapsed |