Power factor correction with reduced total harmonic distortion

Details Power factor correction with reduced total harmonic distortion Power factor correction with reduced total harmonic distortion

1999-05-07

2000-10-03

Riley, Shawn

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 44, 323283, 323284, H02M 768

Patent

active

061282057

ABSTRACT:
Commercially available transition mode ("TM") power factor correction ("PFC") pre-regulator integrated circuits ("IC") typically have an output pin that is used to control a MOSFET in the power output circuit as well as a multiplier input pin that is used to set the peak current that is conducted by the MOSFET on a cycle-by-cycle basis. A portion of the rectified line voltage typically is applied to the multiplier input pin. Zero crossing distortion in the input line current is significantly decreased by reducing the range of the portion of rectified line voltage applied to the multiplier input of the TM PFC IC. The range may be reduced in any convenient manner. For example, one technique adds a clamping device such as a Zener diode to the voltage divider used to sense the rectified line voltage, so that the peak value at the PFC IC multiplier input is clamped if the rectified line voltage exceeds a certain value. Another technique actively changes the value of impedance in the voltage divider used to sense the rectified line voltage based on, for example, either the peak or average rectified line voltage. The change in the divider impedance may be achieved in any convenient manner, as for example by using a small signal transistor to switch a resistor in and out of the divider and a peak detector or average sense circuit to turn the signal transistor ON or OFF as a function of the rectified line voltage.

REFERENCES:
patent: 4683529 (1987-07-01), Bucher, II
patent: 5801935 (1998-09-01), Sugden et al.
patent: 5910891 (1999-06-01), Jo

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