Application Note AN-1077 - International Rectifier

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Voltage Feedback Loop .......................................................................12 Voltage Loop Compensation...........................................................14 Design Tips ..........................................................................................16 IC Decoupling Capacitor.................................................................16 Inductor Design...............................................................................16 Gate Drive Considerations..............................................................17 PCB Layout.....................................................................................17 Additional Noise Suppression Considerations ................................18 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 converter specifications and necessary design tradeoffs. www.irf.com AN-1077 cover
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 converter specifications and necessary design tradeoffs. Topics Covered • Power Factor Correction • One Cycle Control operation • IR1150 Detailed Description • Design procedure and example • Design Tips ‣ 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 integral 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. T 1 Real Power = VIN I INdt (1) T ∫ 0 Apparent Power = V ⋅ (2) REAL APPARENT inRMS I inRMS P PF = (3) P For a sinusoidal voltage this can be written as: Vrms ⋅ I rms1 ⋅ cos( φ ) I rms1 PF = = cos( φ ) (4) V ⋅ I I rms rms V rms is the line voltage RMS value I rms is the line current RMS value rms 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: k D I rms1 = ;kφ = cos( φ ) (5) I rms 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. ∑ ∞ n= 1 2 I = I (6) rms rmsn I − I THD = (7) 2 2 rms rms1 2 I rms1 International Rectifier Technical Assistance Center: USA ++1 310 252 7105 Europe ++44 (0)208 645 8015 1 of 18
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Application Note AN-1077 - International Rectifier

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