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EE 241 Design Problem. Paguio , Cindy Sandoval, Andrew Valdez, Rozelle. Specifications. Typical Lab Supply Single Output Flyback converter in DCM Vi = universal supply (85V to 264V) Io = 0 to 3A Vo = 2V to 20V. Block Diagram. Linear Regulator. Flyback Converter. Assumptions:

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ee 241 design problem

EE 241 Design Problem

Paguio, Cindy

Sandoval, Andrew

Valdez, Rozelle

specifications
Specifications
  • Typical Lab Supply
  • Single Output
  • Flyback converter in DCM
  • Vi = universal supply (85V to 264V)
  • Io = 0 to 3A
  • Vo = 2V to 20V
flyback converter
Flyback Converter
  • Assumptions:
    • Efficiency = 80%
    • fs = 175kHz
    • Iout = 5A
  • Design Approach
    • 5 Outputs (4.3V, 8.3V, 12.3V, 16.3V, 20.3V)
      • Tap Configuration
    • 15V Primary Auxiliary Output
      • To power PWM Controller
    • 24V Secondary Auxiliary Output
      • To power op-amps in linear regulator and the flyback switcher
flyback transformer design
Flyback Transformer Design
  • Primary Side:
    • Core: E14-3C90
    • Ie = 78.6mm, Ae = 97.1mm^2, Ue =67

(1)

N = 26.68 turns

  • Secondary Side:

(2)

15V flyback auxiliary output: Nsec = 3.48 turns

24V flyback auxiliary output: Nsec = 4.93 turns

flyback transformer
Flyback Transformer
  • Secondary Side:
    • Multi-output tap configuration
    • Outputs are in 4V increments (4.3V, 8.3V, 12.3V, 16.3V, 20.3V)
    • Eq. 2 is used to get Nsec for Vout = 4.3V
    • Nsec(4.3V) = 0.998 turns
    • Nsec(4V) = 0.938 turns
    • Nsec(8.3V) = Nsec(4.3V) + Nsec(4V)
    • Nsec(12.3V) = Nsec(4.3V) + 2*Nsec(4V)
    • Nsec(16.3V) = Nsec(4.3V) + 3*Nsec(4V)
    • Nsec(20.3V) = Nsec(4.3V) + 4*Nsec(4V)
flyback transformer1
Flyback Transformer
  • PWM Controller Circuit and Switch:
    • Osc pin:
      • fs = 175kHz, 1.8/RC, R >= 5kHz
      • R1 = 5kohms, C4 = 2nF
    • Sense pin:
      • Pout = Vout,max*Iout,max = 20.3*5A=101.5W
      • I_peak = (5.5*Pout)/Vin,min = (5.5*101.5)/(85*sqrt(2))

= 4.64A

      • Rsense = 1.0/I_peak = 1.0/4.64 = 215mΩ
flyback simulation
Flyback (Simulation)
  • Conditions: Vin = 85Vrms
flyback simulation1
Flyback (Simulation)
  • Conditions: Vin = 85Vrms
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