One cycle control PFC boost converter integrated circuit...

Electricity: power supply or regulation systems – In shunt with source or load – Using choke and switch across source

Reexamination Certificate

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Reexamination Certificate

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07068016

ABSTRACT:
A power factor corrected boost converter circuit includes a rectifier connectable to an ac input and having a rectified dc output provided across a dc bus, an inductor having first and second terminals connected in one leg of the dc bus, an integrated circuit comprising a control circuit for controlling a switch, the integrated circuit including a housing enclosing the control circuit, the integrated circuit having a power terminal, a ground terminal, a first control input terminal coupled to an output of the converter circuit, and a second control input terminal coupled to a sensor for sensing current in the dc bus and further having an output terminal connected to the switch, a boost rectifier diode having a first terminal, the diode coupled to the inductor, and a storage capacitor connected to the diode. The control circuit comprises a one cycle control circuit having an integrator reset by a clock signal for each cycle of the clock signal. The circuit further includes any or all of an inrush current limiting circuit for limiting the current through the inductor to a value below a predetermined level, a fan motor speed controller and a housekeeping power supply controller.

REFERENCES:
patent: 3781637 (1973-12-01), Potter
patent: 5343122 (1994-08-01), Sugimori et al.
patent: 5436550 (1995-07-01), Arakawa
patent: 6011707 (2000-01-01), Mine
patent: 6043705 (2000-03-01), Jiang
patent: 6163470 (2000-12-01), Chavez et al.
patent: 6225797 (2001-05-01), Willis et al.
patent: 6297980 (2001-10-01), Smedley et al.
patent: 6781352 (2004-08-01), Athari et al.

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