High power-factor converter for motor drives and power supplies

Details High power-factor converter for motor drives and power supplies High power-factor converter for motor drives and power supplies

1991-03-15

1993-08-10

Beha, Jr., William H.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

323224, 363 81, 363 89, H02M 706, H02M 3157, G05F 170

Patent

active

052355047

ABSTRACT:
A high power-factor converter (50) for use with motor drives and power supplies. A first and "buck"-type converter section (62) is connected to an a.c. voltage source. This section provides an output voltage having preselected voltage characteristics. This section is operational during that portion of an input voltage cycle in which the input voltage level exceeds that of the output voltage level. A second and "boost"-type converter section (70) is also connected to the voltage source. This second section also provides the output voltage, and is operational during that portion of the input voltage cycle in which the output voltage level exceeds that of the input voltage level. A control circuit (66) is responsive to the relative levels of the input and output voltages to operate the first and second converter sections on a time sharing basis in which converter operation is switched between the two converter sections as a function of the sensed actual output voltage characteristics compared to the preselected characteristics. This permits the converter to maintain a nearly full conduction angle, and therefore a high power factor, for any level of output voltage in a range from zero volts to voltage levels higher than the peak input voltage level.

REFERENCES:
patent: 4618812 (1986-10-01), Kawakami
patent: 4729088 (1988-03-01), Wong
patent: 4958121 (1990-09-01), Cuomo et al.
patent: 4964029 (1990-10-01), Severinsky et al.
patent: 5134355 (1992-07-01), Hastings
Unitrode Switching Regulator Power Supply Design Seminar Manual, Unitrode Corp 1988, pp. 613, 614.

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