Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1992-06-23
1995-05-16
Stephan, Steven L.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
363 48, 363126, H02M 112
Patent
active
054166870
ABSTRACT:
A saturating inductor or transformer is used to shape input current flowing into an alternating current (AC) to direct current (DC) power supply to correct the power factor for the supply. If a saturable inductor is used, it is connected to feed current into the power supply and a capacitor is connected across the input of the power supply. The capacitor precharges the saturable inductor to a point just short of saturation during a preliminary portion of each sinusoidal half cycle of the input AC power. For steady state operation, this is the point at which current will start to flow into the AC to DC power supply and the inductor will saturate. Since the inductance falls in accordance with a permeance curve characteristic of material used to construct the inductor, the current will continue to flow at the same or an increasing level despite the declining voltage level of the AC input power. In the final portion of each half cycle of the input AC power, power stored in the inductor and capacitor discharges into the power supply to extend the current flow beyond its normal point of termination. If a saturable transformer is used, it is connected to feed current into the power supply through a secondary winding of the transformer with a primary winding of the transformer being connected to a common low voltage or ground of the source of AC power and the AC to DC power supply either directly or through primary current control means. For this embodiment, transformer action boosts the voltage level applied to the AC to DC power supply which also serves to precharge the secondary winding. As the current builds, the transformer nears saturation toward the peak of the input voltage waveform. Operation is similar in that current continues to flow or even increase during a portion of the declining voltage of the input power due to the reduced inductance caused by saturation of the transformer.
REFERENCES:
patent: 1886180 (1932-11-01), Green
patent: 1975647 (1934-10-01), Osnos
patent: 1976581 (1934-10-01), Rose
patent: 3133259 (1964-05-01), Van Dine
patent: 3147094 (1964-09-01), Hall et al.
patent: 3422341 (1966-06-01), Kurimura
patent: 4053820 (1977-10-01), Peterson et al.
patent: 4130790 (1978-12-01), Heisey
patent: 4161772 (1979-07-01), Moerman
patent: 4195334 (1980-03-01), Perry et al.
patent: 4222096 (1980-09-01), Capewell
patent: 4238708 (1980-12-01), Kaneda
patent: 4369490 (1983-01-01), Blum
patent: 4462071 (1984-07-01), Blok
patent: 4680689 (1987-07-01), Payne et al.
patent: 4683529 (1987-07-01), Bucher, II
patent: 4719552 (1988-01-01), Albach et al.
patent: 4816982 (1989-03-01), Severinsky
patent: 4821166 (1989-04-01), Albach
patent: 4831508 (1989-05-01), Hunter
patent: 4855890 (1989-08-01), Kammiller
patent: 4914375 (1990-04-01), Hatanaka
patent: 4930061 (1990-05-01), Slack et al.
patent: 4961044 (1990-10-01), Kravitz
patent: 4977493 (1990-12-01), Smith
patent: 5113335 (1992-05-01), Smith
patent: 5218272 (1993-06-01), Jones
Berhane Adolf
Delta Coventry Corporation
Stephan Steven L.
LandOfFree
Power factor correction circuit for AC to DC power supply does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Power factor correction circuit for AC to DC power supply, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Power factor correction circuit for AC to DC power supply will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-642718