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design the ipad charger

design the ipad charger

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  • 1. Po = 10WVs = 240VrmsF = 50HzFswitching = 20kHzVo = 5.1 VDC, 5% (+ 2%) voltage ripple factorIo = 2.1ARepeat the design for <3% ( + 2%) voltage ripple factorTHE IDEAVAC INPUT --- RECTIFIER --- BUCK -----VO, Io, PoRECTIFIER CIRCUIT
  • 2. RECTIFIER PARAMETERTHE CALCULATION - REFER PAGE 123 DANIEL W HART
  • 3. RECTIFIER WAVEFORM Vs Is Ic + Ir Vo
  • 4. BUCK CIRCUIT
  • 5. BUCK PARAMETERTHE BUCK CALCULATIONVO = 5.1, IO = 2.1, FSWITCHING = 2O kHz, VSMAX = 339.411V, RIPPLE V = 2%VO = DVS Thus, D = 0.015IO = IR = VO/R R = 2.43LMIN = (1 – D) R / 2F LMIN = 0.0598mHL = 10LMIN L = 0.598MhΔVO = (1 – D) / 8LCF2 C = 25.7368uF
  • 6. BUCK WAVEFORM (RALF VIEW) – the Vo decreased from Vm = 339.411V to 5.1V Vs Vmosfet Gate signal Io Vo
  • 7. BUCK WAVEFORM (STEADY STATE; DETAIL VIEW) Vs Vmosfet Gate signal; D = 0.015 FROM THE WAVEFORM IO = 2.1A VO = 5.08V RIPPLE, ΔVO = (5.11 – 5.05) / 5.08 = 1.2%
  • 8. AFTER COMBINE THE CIRCUIT
  • 9. THE WAVEFORM AFTER COMBINATION (RECTIFIER -- BUCK --- 2A, 5V, ripple 6%, 10W) Vo(rec) = Vs(buck) Vmosfet Gate signal SINCE THE DESIGN IS TO GET THE Io = 2.1A, Vo = 5.1 VDC, 5 %( +- 2%) ripple and Po = 10W THUS, THIS OUTPUT IS ACCEPTABLE Io = 2A VO = 4.95V Vripple ͌ (5.1-4.8)/4.95 = 6% Po = IoVo = 9.9W
  • 10. REDUCE THE RIPPLE BY ADDING THE CAPASITOR FILTER
  • 11. REDUCE THE RIPPLE BY ADDING THE CAPASITOR FILTER AND THE OUTPUT WAVEFORM AS BELOW Vo(rec) = Vs(buck) Vmosfet Gate signal SINCE THE DESIGN IS TO GET THE Io = 2.1A, Vo = 5.1 VDC, < 3 %( +- 2%) ripple and Po = 10W THUS, THIS OUTPUT IS ACCEPTABLE Io = 2A VO = 5.04V Vripple ͌ (5.11-4.95)/5.04 = 3% Po = IoVo = 10.1W

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