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AN-1077

PFC Converter Design with IR1150 One Cycle Control IC

International Rectifier 

Application Note AN-1077

PFC Converter Design with IR1150

One Cycle Control IC

R. Brown, M. Soldano, International Rectifier

This Application Note describes the design methodology of a Continuous Conduction Mode Power

Factor Correction circuit utilizing a boost converter and featuring the IR1150S PFC IC. The IR1150

is based on International Rectifier’s proprietary “One Cycle Control” technique for PFC converter

control. This application note presents a complete, step-by-step, design procedure including con-

verter specifications and necessary design tradeoffs.

Topics Covered

• Power Factor Correction

• One Cycle Control operation

• IR1150 Detailed Description

• Design procedure and example

• Design Tips

¾ For additional data, please visit our website at:

http://www.irf.com/product-info/smps/

http://www.irf.com/e/ir1150ppdus.html/

Keywords: PFC, Power Factor Correction, THD, One

Cycle Control, OCC

Introduction

Power factor is defined as the ratio of real power

to apparent power, where real power is the time inte-

gral of the instantaneous power measured over a full

period and the apparent power is simply the product

of the rms voltage and rms current measured over the

entire period.

For a sinusoidal voltage this can be written as:

PF = Vrms ⋅ Irms1 ⋅ cos( φ ) = Irms1 cos( φ ) (4)

Vrms ⋅ I rms

I rms

Vrms is the line voltage RMS value

I rms is the line current RMS value

I rms1 is the line current fundamental harmonic

φ is the displacement angle between voltage and current

In this case power factor can be split into distortion

factor and displacement factor:

kD

=

I rms1

I rms

; kφ

= cos(φ

)

(5)

Phase shift between the voltage and current

waveforms is introduced by the reactive nature of the

input, either inductive or capacitive.

In a purely resistive load, the voltage and current

will be sine waves, in phase, true power will equal

apparent power and PF = 1.

∫ Real

Power

=

1

T

T

0

VIN

IIN dt

(1)

Apparent Power = VinRMS ⋅ IinRMS

(2)

PF = PREAL

(3)

PAPPARENT

∞

∑ Irms =

I2

rmsn

(6)

n=1

THD =

I2

rms

−

I2

rms1

I2

rms1

(7)

International Rectifier Technical Assistance Center:

USA ++1 310 252 7105 Europe ++44 (0)208 645 8015 1 of 18

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