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ON Semiconductor - Implementing Cost Effective and Robust Power Factor Correction

Numéro de référence AND8282
Description Implementing Cost Effective and Robust Power Factor Correction
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AND8282 fiche technique
AND8282/D
Implementing Cost
Effective and Robust Power
Factor Correction with the
NCP1606
Prepared by: Jon Kraft
ON Semiconductor
http://onsemi.com
APPLICATION NOTE
Introduction
The NCP1606 is a voltage mode power factor correction
(PFC) controller designed to drive costeffective
preconverters to meet input line harmonic regulations. The
device operates in Critical Conduction Mode (CRM) for
optimal performance in applications up to about 300 W. Its
voltage mode scheme enables it to obtain unity power factor
without the need for a line sensing network. The output
voltage is accurately controlled with a built in high precision
error amplifier. The controller also implements a
comprehensive array of safety features for robust designs.
This application note describes the design and
implementation of a 400 V, 100 W, CRM Boost PFC
preconverter using the NCP1606. The converter exhibits
high power factor, low standby power dissipation, good
active mode efficiency, and a variety of protection features.
The Need for PFC
Most electronic ballasts and switching power supplies use
a diode bridge rectifier and a bulk storage capacitor to
produce a dc voltage from the utility ac line. This produces
a nonsinusoidal current draw and places a significant
demand on the power delivery infrastructure. Increasingly,
government regulations and utility requirements often
necessitate control over line current harmonic content.
Active PFC circuits have become the most popular way to
meet these harmonic content requirements. They consist of
inserting a PFC preregulator between the rectifier bridge
and the bulk capacitor (Figure 1). The boost (or stepup)
converter is the most popular topology for active power
factor correction. With the proper control, it can be made to
produce a constant output voltage while drawing a
sinusoidal current from the line.
Rectifiers
PFC Preconverter
Converter
AC Line
High
+ Frequency
Bypass
Capacitor
NCP1606
+ Bulk
Storage
Capacitor
Load
Figure 1. Active PFC Stage with the NCP1606
Basic Operation of a CRM Boost Converter
For medium power (<300 W) applications, critical
conduction mode (CRM) is the preferred control method.
Critical conduction mode occurs at the boundary between
discontinuous conduction mode (DCM) and continuous
conduction mode (CCM). In CRM, the next driver on time
is initiated when the boost inductor current reaches zero.
Hence, CRM combines the lower peak currents of CCM
operation with the zero current switching of DCM
operation. But this control method means that the frequency
inherently varies with the line input voltage and the output
load. The operation and waveforms in a PFC boost converter
are illustrated in Figure 2. For detailed information on the
operation of a CRM Boost Converter for PFC applications,
please refer to AND8123 at www.onsemi.com.
© Semiconductor Components Industries, LLC, 2009
May, 2009 Rev. 3
1
Publication Order Number:
AND8282/D

PagesPages 18
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