SLUAAY1 October   2024 UCC28064A

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Interleaving PFC Principle of Operation
  6. 3Original PFC Design with Internal Line Feed-Forward block
  7. 4Current Phenomenon of Operating With UCC28064A Internal Line Feed Forward Function
  8. 5Achieving Adaptive Current Control PFC With UCC28064A
  9. 6Test Results Comparing Original PFC Design to Adaptive PFC Design
  10. 7Summary
  11. 8References

6 Test Results Comparing Original PFC Design to Adaptive PFC Design

Table 6-1 shows thermal test result with decrease temperature in PFC block components, especially PFC inductor with applying adaptive PFC external circuit design against original boost PFC design.

Table 6-1 Temperature Result Between Original PFC Design and Adaptive PFC Design
Original Interleaved PFC Interleaved Adaptive PFC Remark
Inductor
EER3311 x 2EA EER3311 x 2EA
140μH, 0.1Φx30P 140μH, 0.1Φx30P
71.5. °C 62.1°C 10.4℃↓
FET 56.8°C 52.7°C 4.1℃↓
Diode 56.5°C 52.6°C 3.9℃↓

Table 6-2 shows efficiency test result of increased efficiency value at total board condition when applying adaptive PFC external circuit design against original boost PFC design.

Table 6-2 Efficiency Increases With Adaptive PFC Design Over Original PFC Design
Input Voltage 110Vac 230Vac
Load Efficiency Improvement Efficiency Improvement
25% 1.96% 0.69%
50% 1.11% 0.61%
75% 0.88% 0.43%
100% 0.62% 0.33%

Table 6-3 shows PF(Power Factor) test result of decreased PF value at low AC input condition when applying adaptive PFC external circuit design against original boost PFC design. But the PF standard is 0.9 or higher and this standard is met even if an adaptive PFC design is applied.

Table 6-3 PF Test Result Between Original PFC Design and Adaptive PFC Design
Input Voltage Original PFC Adaptive PFC
90Vac 0.99 0.95
132Vac 0.99 0.95
230Vac 0.95 0.95
264Vac 0.94 0.94

Table 6-4 shows various comparison waveforms especially inductor current value with applying adaptive PFC external circuit design against original boost PFC design. As shown from the comparison waveforms, the board with adaptive PFC external circuitry has a significantly lower inductor current value than the existing circuit board.

Table 6-4 Waveforms Between Original PFC Design and Adaptive PFC Design
Original PFC Adaptive PFC

Max Load

Operating
ILmax = 7.79A(Vin:90Vac,Vout:395V) ILmax = 6.13A(Vin:90Vac,Vout:353V)

Normal Operating
ILmax ILmax = 7.09A(Vin:90Vac,Vout:395V) ILmax = 5.62A(Vin:90Vac,Vout:353V)

Line Transient Operating

(264Vac to 90Vac)
ILmax ILmax = 9.71A ILmax = 6.70A
Note: CH1(Yellow) :VPFC OUT, CH2(Red): GDA, CH3(Blue): VCOMP, CH4(Green): IINDUCTOR