Three phase buck power converters having input current control

Details Three phase buck power converters having input current control Three phase buck power converters having input current control

2006-11-21

2006-11-21

Berhane, Adolf (Department: 2838)

Electric power conversion systems

Current conversion

Using semiconductor-type converter

Reexamination Certificate

active

07139180

ABSTRACT:
A three phase buck power converter having input power control is described. The power converter uses a three input buck converter comprising switches for each phase, a catch rectifier, an inductor and an output capacitor. The duty cycle of the three switches is constrained to have a sine function relationship that may be derived from the input voltage wave form or from a reference oscillator. When so constrained, the input currents have high power factor. The output is a precise, high quality dc voltage, comparable to the output of a dc—dc buck converter, and the dynamic response is comparable. Voltage mode and current mode controls are shown, as is a precise line regulation feed forward for the voltage mode embodiment. The three phase buck power converter may be operated in reverse as a three phase boost converter, as they are reciprocal. A three phase ac—ac converter may have a three phase buck converter as its input and a three phase boost converter as its output.

REFERENCES:
patent: 4384321 (1983-05-01), Rippel
patent: 5144222 (1992-09-01), Herbert
patent: 5570279 (1996-10-01), Venkataramanan
patent: 6049471 (2000-04-01), Korcharz et al.
patent: 6545887 (2003-04-01), Smedley et al.
patent: 6690585 (2004-02-01), Betts-LaCroix
patent: 6826028 (2004-11-01), Schuellein

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