SLUAB06 January   2025 AMC131M02 , AMC3330 , ISO7731

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Topologies for Insulation Monitoring in ESS
    1. 2.1 Single Switch Topology
      1. 2.1.1 Test Steps
    2. 2.2 Dual Switch Floating Sampling Topology
      1. 2.2.1 Test Steps
    3. 2.3 Dual Switch Sampling in High Voltage Side Topology
    4. 2.4 AC Injection Topology
  6. 3Comparison of Designs
    1. 3.1 Injection Resistance Influence on Accuracy
  7. 4Capacitor Influence on Sampling Time
    1. 4.1 How to Choose Y Capacitor
    2. 4.2 Sampling Time
  8. 5Key Devices
    1. 5.1 BQ79731-Q1
    2. 5.2 UCC33421-Q1
    3. 5.3 AMC131M02
    4. 5.4 AMC3330
    5. 5.5 ISO773x
  9. 6Topos Simulation Result and Conclusion
  10. 7Summary
  11. 8References

6 Topos Simulation Result and Conclusion

Build simulation models for three designs like following:

Design 1 Simulation ModelFigure 6-1 Design 1 Simulation Model
Design 2 Simulation ModelFigure 6-3 Design 2 Simulation Model
Design 3 Simulation ModelFigure 6-5 Design 3 Simulation Model
Design 1 ResultFigure 6-2 Design 1 Result
Design 2 ResultFigure 6-4 Design 2 Result
Design 3 ResultFigure 6-6 Design 3 Result

Take design 3 as an example, As simulation result shows, while sampling time > 5.175s, sampling voltage can be 0.995u.

Table 6-1 Design 3 Test Result
RisoP RisoN RisoP' RisoN' ErrorP ErrorN
10000.0000 10000.0000 10065.1708 10028.0692 -0.6517% -0.2807%
NC 10000.0000 10027.3703 -0.2737%
10000.0000 NC 10067.1862 -0.6719%
50.0000 50.0000 50.4129 50.5771 -0.8258% -1.1543%
50.0000 NC 46.8382 6.3236%
NC 50.0000 50.7680 -1.5359%

As shown in the table, worst accuracy 6.3236% happened in RisoP=50kohm, the actual test results are in agreement with the theory.