One cycle PFC boost converter IC with inrush limiting, fan control and housekeeping supply control

Abstract

A power factor corrected boost converter circuit comprising 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, a first terminal of the inductor coupled to the output of said rectifier, an integrated circuit comprising a control circuit for controlling a switch, the integrated circuit comprising 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 first terminal of the diode coupled to the second terminal of the inductor, the diode having a second terminal, and a storage capacitor connected to the second terminal of the diode, wherein 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 integrator receiving as an input a signal provided on said first control input terminal, further comprising an inrush current limiting circuit for limiting the current through the inductor to a value below a predetermined level. Also disclosed is a fan motor speed controller and a housekeeping power supply controller.

Description

[0001] Cross References to Related Applications [0002] This application is based on and claims the patent application entitled "Single-Cycle Controlled Continuous Conduction Mode PFC Boost Converter IC with Inrush Current Limiting and Fan Speed ​​Control" filed November 1, 2002 by Frank Athari U.S. Provisional Application No. 60 / 423,191 and filed December 9, 2002 by Frank Atari entitled "Continuous Conduction Mode PFC Boost Converter IC with Integrated Inrush Current Limiting, Fan Speed, and Internal Regulatory Control priority of U.S. Provisional Application No. 60 / 431,858. The disclosures of the aforementioned applications are incorporated herein by reference. Background of the invention [0003] One Cycle Control (OCC) techniques for controlling switching circuits are now well known. Its general technique is described in US Patent No. 5,278,490. This technique is applied to a PFC (Power Factor Correction) boost converter in US Patent No. 5,886,586. In OCC technique, w...

AI Technical Summary

Problems solved by technology

[0005] The above prior art with multiplier solutions has the disadvantage of high discrete component count and complex design and requires development work to realize high performance continuous conduction mode power factor correction converters

Furthermore, it is more difficult to implement a "single package" design in which the switch and control circuitry are packaged together because of the high component count and limited number of pins

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