Electric power conversion systems – Current conversion – With condition responsive means to control the output...
Reexamination Certificate
2007-11-13
2007-11-13
Han, Jessica (Department: 2838)
Electric power conversion systems
Current conversion
With condition responsive means to control the output...
C323S235000, C323S240000, C323S284000
Reexamination Certificate
active
11470629
ABSTRACT:
An active power factor correction (PFC) circuit and its controlling method are provided. The method comprises the following steps. Drive the power switch of the circuit so that the average inductor current waveform follows the rectified input voltage waveform. Suspend the operation of the power switch at a first moment in a first line cycle of the rectified input voltage and then resume the operation of the power switch at a second moment in a second line cycle of the rectified input voltage. The first moment is when the phase angle of the rectified input voltage exceeds a predetermined angle and the switching frequency of the power switch exceeds a predetermined frequency. The time span from the first moment to the end of the first line cycle is substantially as long as the time span from the beginning of the second line cycle to the second moment.
REFERENCES:
patent: 5001620 (1991-03-01), Smith
patent: 5367247 (1994-11-01), Blocher et al.
patent: 5737204 (1998-04-01), Brown
patent: 5757166 (1998-05-01), Sodhi
Green Mark Technology Inc.
Han Jessica
Jianq Chyun IP Office
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