Product category: Power Supply ICs and Controllers
News Release from: International Rectifier | Subject: Single cycle control
Edited by the Electronicstalk Editorial Team on 3 June 2003
Novel architecture simplifies PFC
A new single cycle control architecture greatly simplifies boost power factor correction circuits commonly found in AC/DC convertors
International Rectifier's new single cycle control (SCC) architecture greatly simplifies boost power factor correction (PFC) circuits commonly found in AC/DC convertors powering notebook adapters, high-density servers, workstations and computer peripherals. This architecture advancement allows designers to easily create highly efficient, space-saving continuous conduction mode (CCM) controllers in the PFC circuit instead of their larger, less efficient discontinuous current mode (DCM) counterparts.
This article was originally published on Electronicstalk on 3 June 2003 at 8.00am (UK)
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"Traditionally, using DCM or CCM, a designer must compromise on performance, power density or cost.
Typically, a CCM design has high efficiency and density but is very complex and costly.
A DCM solution is cost effective but has lower efficiency and power density.
Today, IR's new SCC topology offers a no compromise solution.
SCC architecture delivers high performance and high power density at low system cost.
Also, SCC transforms the PFC controller design process from over a dozen iterative stages into a three-step, one-time activity", said Stephen Oliver, Marketing Manager for AC-DC Products at International Rectifier.
The SCC architecture implements a form of CCM control but eliminates the complex multiplier, current loop error amplifier and input line voltage sensing circuits required with traditional PFC control methods.
As a result, for example, a 1kW, a universal input 100kHz PFC boost convertor using the SCC topology uses 75% fewer components and less PCB board space than traditional solutions.
Typical power factors of 0.998 are achieved with harmonic currents well within the IEC1000-3-2 specifications.
The name 'single cycle control' refers to the operation of an integrator and the generation of the reference signal during each switching cycle.
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