Power Factor Correction in Power Conversion Applications ...

1 2008 Microchip Technology - 1AN1106 AC-DC AC DC DC 500 2 (PF) (THD) PF (DSC) (PFC) 16 dsPIC DSC PFC PFC DCS - (ADC) (PWM) PFC PF 2 (kW) (kWh) (kVAR) (kVA)

2 1 PFC :Vinaya SkandaMicrochip Technology DSC AN1106DS01106A_JP - 2 2008 Microchip Technology Inc. 1:PFC PFC DC PFC 1 1: 2 2 2 DC DC PFC PFC 00 = / 2008 Microchip Technology - 3AN1106 2.

3 ( UPS SCR ) ( ) ( ) 2 (THD) PFC 2 (V) (I) 2: = cos = THD = I1 = I2 = cos11I2I1 ()2I3I1 () +++------------------------------------- -------------------------------- cos1 THD2+----------------------------== THD1I2I1 ()2I3I1 () +++= RIVVItV (t)I (t)AN1106DS01106A_JP - 4 2008 Microchip Technology Inc.

4 MOSFET IGBT PFC (L) (C) 3 4 3: 4: PFC 3 4 2 PFC AC IL+C V- 2008 Microchip Technology - 5AN1106 PFC DSC PFC 5 PFC dsPIC PFC AC-DC AC DC 3

5 DC 3 dsPIC PWM DC PFC 5 5: DC dsPIC AC AN1106DS01106A_JP - 6 2008 Microchip Technology Inc. PFC (MOSFET) VOUT 6 PFC 7 PFC 6: PFC 7: PFC PFC PFC DC (MOSFET) VIN 8 PFC 9 PFC 8: PFC 9: PFC PFC PFC DC (MOSFET) (VIN+ VOUT) 10 PFC 11 PFC 10: PFC 11.

6 PFC (CMM) +CoD-L tt+Co-DLtt +CoD-Ltt 2008 Microchip Technology - 7AN1106dsPIC30F6010A PFC PFC dsPIC30F6010A PFC dsPIC 12 dsPIC30F6010A PFC dsPIC AC DC DC PFC 2 PFC 12.

7 DsPIC30F6010A PFC +-AN11AN9AN6 PWM 1 VAVG2 VAVGVERRVDCREFIACIERR VAC VACVPIIACREFCoAC LD - dsPIC30F6010A VDCAN1106DS01106A_JP - 8 2008 Microchip Technology 13 14 3 13: PFC 14: PFC k2k3k1 LDQCoLoad VDCVDCIACVACVACIACVAC AC VPI = VCOMP = IPI = k1, k2, k3 = : dsPICDEM MC1H 3 (DS70096) VACk2 =IACk3 =VDCk1 = kmVACxxxxxx VPI = VCOMP = IPI = km = VERRVDCREFVDCVPIIACREFIACIERRIPIVCOMP MOSFET VACVAVG VACN------------------=1 VAVG2-------------------- 2008 Microchip Technology - 9AN1106 IACREF IAC IAC IACREF 100 kHz 5 kHz 10 kHz 80 kHz 8 kHz 80 kHz GI PFC MOSFET

8 DC VDCREF DC IO VAC DC VDC VDCREF GV IACREF VAC VPI IACREF IACREF (VAC VPI) IACREF VAC PFC 3 3: N N = T/TS f = 1/T fs = 1/TS PFC 40 kHz ADC (ISR) 40 kHz 4 4: PFC 5 40 Hz 66 Hz VAC = AC T = AC i/p VAC = ith N = VAVG1T---VACtd ()ttT+() = VAVG 1T---VACi()TS in=inTTS-----+= = VAVG VACi()1 TTS ------------- in= = VAVG VACi() N----------------------=TS140kHz-------- --------140000---------------25 s===AN1106DS01106A_JP - 10 2008 Microchip Technology Inc.

9 5: N 6 6: AC 2 300 500 60 Hz 15 AC N ( ) 16 ADC AC VMINREF VMINREF N 15: AC 16: AV fMAX 66 HzTMIN fMIN 40 HzTMAX 25ms==toNMAXTMINTS------------25ms25 s-------------1000=== s--------------------6 0 0===VACt VAC VACtVACVMINREFT2TS ()N= 2008 Microchip Technology - 11AN1106 PFC VAC VDC ADC IAC 12 ( ) ADC 14 17 17: PFC 1 PFC kokmxxxxxxVERRVDCREFVPIIERRIPIVCOMPGVGI IPIko =VACVACk2 =IACIACk3 =VDCk1 IACREFIACREFkm = 1.

10 P = 400 Watt ( )VACMIN = 100V, VACMAX = 410V fMIN= 40 Hz, fMAX = 66 Hz VDC = 410V fSW = 80 kHz fS = 40 kHz L = mH CO = 1000 F fBWV = 10 Hz fBWI = 8 kHz330 F3 () : AN1106DS01106A_JP - 12 2008 Microchip Technology Inc. 7: 2 3 4 3:AC 4:DC : (Q15) 0x7 FFF Q15 k1 k2 k3 km IACMAX2P VMIN-------------2 400 100----------------8A=== 2:AC VAC (RMS)VAC ( )ADC ( )Q15 290 volt410 volt0x7 FFF 70 volt100 volt0x1EE0 230 volt325 volt0x6560ffRECT (N) 66 Hz132 Hz300 40 Hz80 Hz500 50 Hz100 Hz400 VDCADC Q15 410 volt0x7300 2008 Microchip Technology - 13AN1106 8.