Electricity: power supply or regulation systems – For reactive power control – Using impedance
Patent
1993-06-29
1997-03-18
Pellinen, A. D.
Electricity: power supply or regulation systems
For reactive power control
Using impedance
323222, 323285, 363 89, G05F 170
Patent
active
056126093
ABSTRACT:
A power factor correction circuit in which an inductor current is detected separately as a charging current indication signal and a discharging current indication signal by using a current sense resistor and a current sense circuit. A scaled-down output DC voltage is compared with a predetermined reference DC voltage by using an error amplifier which serves to produce an output voltage error signal. The output voltage error signal is then multiplied with a divided-down rectified input line voltage through the use of the multiplier to generate a sinusoidal reference signal. The sinusoidal reference signal is used by peak and valley comparators which also receive the charging and the discharging current indication signals. The outputs from the peak and the valley comparators are used to control a FET transistor which controls the input line current. As a result, the power factor correction circuit is capable of effectively eliminating a dead time and thereby achieving a near unity power factor.
REFERENCES:
patent: 4683529 (1987-07-01), Bucher, II
patent: 5003454 (1991-03-01), Bruning
Donohoe Charles R.
Han Y. Jessica
Pellinen A. D.
Samsung Electronics Co,. Ltd.
Westerlund Robert A.
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