IRPLCFL3【PDF 1/12 页】KIT DESIGN CFL TRIAC DIMMING

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IRPLCFL3

R E F E R E N C E D E S I G N

IRPLCFL3 rev.b

International Rectifier ? 233 Kansas Street, El Segundo, CA 90245 USA

IRPLCFL3: A ballast that can be dimmed

from a domestic (phase cut) dimmer

By Peter Green

TOPICS COVERED

Introduction

Dimmer Circuit

Proposed Solution

Block Diagram

Functional Description

Schematic Diagram

Design Considerations

Bill of Materials

IR2156

IRPLCFL3

INTRODUCTION

It has often been a disadvantage with electronic ballasts that they have been unable to

be dimmed with a standard (phase cut) type of dimmer, particularly in the case of small

integral ballast-lamp combinations commonly used in the home to save energy. This is

due to the fact that, where there is no power factor correction, the ballast circuit input

consists of a rectification stage followed by a large storage capacitor connected to the

AC mains supply that provides the DC bus from which the high frequency half bridge

and output section is supplied. In such a system current is drawn from the mains only

near the peak of the mains voltage where the storage capacitor charges and not during

the remainder of the mains half-cycle.

Virtually all domestic and professional dimming systems are based on triacs. These

devices will conduct once they have been fired, only while current flows in excess of the

holding current of the device. These dimmers work very well with a resistive load such

as an ordinary Tungsten filament light bulb as the triac can be fired at any point during

the mains half-cycle and will continue to conduct until very close to the end of the half-

cycle as current is drawn continuously over this period. In this way the lamp current can

be adjusted from maximum to zero.

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