Electric power conversion systems – Current conversion – With voltage multiplication means
Patent
1999-02-19
2000-11-28
Riley, Shawn
Electric power conversion systems
Current conversion
With voltage multiplication means
H02M 318
Patent
active
061543802
DESCRIPTION:
BRIEF SUMMARY
FIELD OF INVENTION
The present invention relates to an AC/DC boost converter that has a high power factor and that can be connected to different network or mains voltages.
BACKGROUND OF THE INVENTION
Traditional rectifier circuits in which energy is first stored in a capacitor that is charged to a peak voltage from a rectifier bridge have low power factors. These circuits also usually generate markedly distorted sinusoidal currents that are liable to cause disturbances in a connected public switched network. Various solutions to this problem have been proposed.
U.S. Pat. No. 5,383,109 teaches a rectifier circuit that has a high power factor. The circuit is constructed as a full-wave rectifier bridge for high mains voltages and as a voltage doubler for low mains voltages. Output voltage control and power factor correction are achieved with the aid of a high frequency booster circuit that includes two coils which are parallel-coupled at low mains voltages and series-coupled at high mains voltages. The circuit also includes two series-coupled transistors which function as pulse wave modulators.
One drawback with the aforedescribed circuit is that it includes double transistors and double switches, causing the circuit to be unnecessarily complicated.
SUMMARY OF THE INVENTION
The present invention solves, on the one hand, the problem of how the power and efficiency of a load coupled to an electric rectifying circuit shall be held constant irrespective of whether the alternating mains voltage takes one of two different values, e.g. either a value of 220V or a value of 110V, and, on the other hand, the problem of how an input current shall be able to assume a predetermined current curve.
Another problem is that in order to maintain constant load power values when the mains voltage assumes the aforesaid typical values for instance, certain circuit components must be dimensioned for very high energies and therewith become unnecessarily large and expensive.
The aforesaid problems are solved by means of the present invention with the aid of an improved electric rectifying circuit that includes a plurality of diodes, at least one coil, at least two capacitors, at least one selector switch, and at least one high frequency switch.
In one embodiment, two pairs of series-coupled diodes are arranged to form a full-wave rectifier. A DC voltage is applied to the full-wave rectifier at a connection point located in the connection line between the diodes of the one diode pair, and the other connection point is located between the diodes of the other diode pair. Two coils and the high frequency switch are coupled in parallel with the full-wave rectifier. One terminal of the first coil is connected to one DC-side of the full-wave rectifier that has the highest potential, the so-called positive side. One terminal of the other coil is connected to the other DC-side of the full-wave rectifier that has the lowest potential, the so-called negative side. The high frequency switch is coupled between the two coils such that a first terminal of the high frequency switch will be coupled to a second terminal of the first coil and a second terminal of the high frequency switch will be coupled to the other terminal of the second coil.
A fifth and a sixth diode and two capacitors are coupled in parallel with the high frequency switch. The anode of the fifth diode is coupled to the first coil, so that said first coil will sit between the positive side in the full-wave rectifier and said fifth diode. The cathode of a sixth diode is coupled to the second coil, so that the second coil will sit between the negative side in the full-wave rectifier and the cathode on the sixth diode.
Two series-coupled capacitors are disposed between the first and the second diode. One terminal or side of a switch is connected to the connecting line between the one diode-pair in the full-wave rectifier. The other terminal or side of the switch is disposed on the connecting line between the two capacitors.
In the case of a relatively high AC voltage, for insta
REFERENCES:
patent: 3526821 (1970-09-01), Thomas
patent: 4864488 (1989-09-01), Bulmahn et al.
patent: 5119283 (1992-06-01), Steigerwald et al.
patent: 5383109 (1995-01-01), Maksimovic et al.
patent: 5969481 (1999-10-01), Konopka
Assow Bengt
Rolleberg Kjell
Laxton Gary L.
Riley Shawn
Telefonaktiebolaget LM Ericsson
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