Power factor improving circuit

Details Power factor improving circuit Power factor improving circuit

2007-04-10

2007-04-10

Riley, Shawn (Department: 2838)

Electricity: power supply or regulation systems

For reactive power control

C323S285000

Reexamination Certificate

active

10953766

ABSTRACT:
The power factor improving circuit has a current detecting resistor Rsh for detecting current conducting through a set up reactor L1or current conducting through a switch Q1, an output voltage detector11which amplifies a difference between output voltage Eo and reference voltage Vref to generate error voltage, a variable gain amplifier15which amplifies voltage which is proportional to current detected by the current detecting resistor Rsh by varying gain in accordance with a value of the error voltage of the output voltage detector11, and a pulse width modulator14which generates a pulse signal whose pulse width is controlled in accordance with a value of output of the variable gain amplifier15and which applies the pulse signal to the switch Q1to control the output voltage Eo to predetermined voltage.

REFERENCES:
patent: 3913002 (1975-10-01), Steigerwald et al.
patent: 4974141 (1990-11-01), Severinsky et al.
patent: 5804950 (1998-09-01), Hwang et al.
patent: 6531854 (2003-03-01), Hwang
patent: 03-284168 (1991-12-01), None
patent: 2000-037072 (2000-02-01), None

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