Lecture 16 Boost PFC

Lecture 16 Boost PFC - Lecture 16 AC - DC conversion PFC...

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Lecture 16 AC - DC conversion PFC circuits
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EEE 498/591 – Raja Ayyanar Power factor correction circuits (PFC) • Diode bridge rectifiers and motivation for PFC • Single phase PFC circuits Boost converter in CCM ‘Natural rectifiers’ in DCM
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Vs D1 D3 D4 D2 0s 5.0ms 10.0ms 15.0ms 20.0ms 25.0ms 30.0ms 33.3ms -200 -100 0 100 200 170 in pk V: V 1200 o P :W 14 1 10 in pk RMS I: . A :A Under UPF Actual 71 5 19 8 in pk RMS .A :. A o V in i in v o I in i in v o I Higher peak and RMS currents Harmonic distortion Single phase diode bridge rectifier EEE 498/591 – Raja Ayyanar
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0s 5.0ms 10.0ms 15.0ms 20.0ms 25.0ms 30.0ms 33.3ms -100 -50 0 50 100 2 2 1 144 j j I THD % I  1 in, i in i in v 1 15 41 19 pk i:. A 74 20 in pk RMS i: A A Single phase diode bridge rectifier Frequency 0Hz 100Hz 200Hz 300Hz 400Hz 500Hz 600Hz 700Hz 800Hz 900Hz I(Ls) 0A 4A 8A 12A 16A (780.002,3.2776) (660.002,3.9566) (540.001,5.9155) (420.001,8.7410) (300.001,11.695) (180.001,14.106) (60.000,15.456) EEE 498/591 – Raja Ayyanar
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0 1 () Average power Power factor Apparent power T ss rms rms vt it T VI  1, Powerfactor cos cos rms rms rms rms rms rms I I 1 ,rms rms I distortion factor I cos displacement factor  22 rms rms rms II THD I Diode bridge example Displacement factor : 0.945 Distortion factor : 0.544 Power factor : 0.515 THD : 150 % Power factor definitions EEE 498/591 – Raja Ayyanar
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, 34 neutral RMS iA 0 Ls Rs 2000uF D2 D4 D3 D1 D5 D12 D11 D10 D9 D8 D7 D6 L6 L5 R4 10m R3 10m 2000uF 2000uF neutral i Neutral current (ideally should be zero) is even larger than the phase currents Neutral currents with balanced diode bridge loads Time 0s 5.0ms 10.0ms 15.0ms 20.0ms 25.0ms 30.0ms 33.3ms I(R7) RMS(-I(R7)) -100A -50A 0A 50A 100A EEE 498/591 – Raja Ayyanar
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in L i S i S v rect v in L S o C L R S i in L i • most popular PFC topology • inductor current controlled to follow v rect • usually used as a pre-regulator • high switching frequency – > 100 kHz PFC based on boost converter in CCM EEE 498/591 – Raja Ayyanar
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Lecture 16 Boost PFC - Lecture 16 AC - DC conversion PFC...

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