Electric power conversion systems – Current conversion – With condition responsive means to control the output...
Reexamination Certificate
2008-04-30
2011-12-27
Behm, Harry (Department: 2838)
Electric power conversion systems
Current conversion
With condition responsive means to control the output...
C323S207000, C323S288000
Reexamination Certificate
active
08085562
ABSTRACT:
A one cycle power factor correction converter circuit comprising a switch for controlling a DC output voltage of the converter circuit, the switch being switched by a drive signal having a frequency determined by a clock signal; the converter circuit being provided with a DC input voltage and producing the DC output voltage, the DC input voltage being rectified from an AC input; a controller circuit for controlling an on-time or off-time of the switch to set the output voltage and to achieve power factor correction at the AC input; the controller circuit comprising an error amplifier receiving a feedback voltage from the output of the converter circuit and a reference voltage and producing an error signal; a ramp generator receiving the error signal and generating a first ramp signal by integrating a signal related to the error signal; a pulse width modulation circuit receiving the first ramp signal and a signal related to the error signal and producing a pulse width modulated signal by comparing the first ramp signal and the signal related to the error signal; the pulse width modulated signal determining the on-time or off-time of the switch to control the output voltage with power factor correction; further comprising a circuit for terminating the first ramp signal when a predetermined inequality exists between the first ramp signal and a reference signal and for developing the clock signal from the first ramp signal.
REFERENCES:
patent: 6366070 (2002-04-01), Cooke et al.
patent: 7106130 (2006-09-01), Gan et al.
patent: 2006/0043956 (2006-03-01), Clavette
Behm Harry
Farjami & Farjami LLP
International Rectifier Corporation
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