SLOA338 March   2025 TSD5402-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction TO RESOLVER and LVDT sensors
  5. 2Conventional Excitation Amplifier
  6. 3Excitation Amplifier Using Class-D Amplifiers
  7. 4Class-D Resolver Excitation Design Details
    1. 4.1 Components Selection for the Power Stage
    2. 4.2 Input Filter Components Selection
  8. 5Practical Experiments
    1. 5.1 Test Setup
    2. 5.2 Output Waveforms for Default Conditions
    3. 5.3 Amplifier Transfer Function
    4. 5.4 Using PWM for Generating the Reference Signal
    5. 5.5 Thermal Image and Comparison Against the Linear Design
    6. 5.6 Output Spectrum
    7. 5.7 Total Harmonic Distortion (THD)
    8. 5.8 Fail Events
  9. 6Summary
  10. 7References

6 Summary

Engineers recognize Class-D amplifiers mainly for high efficiency and resulting lower power dissipation. Seemingly same operation in the resolver excitation amplifier leads however to different results. Resolvers transfer negligible power therefore the primary winding acts as a reactive load. Improved efficiency compared to the basic analog circuit is the result of the parallel resonant tank that the output capacitance forms together with the resolver. Resolver excitation with the TSD5402-Q1 Class-D amplifier offers wide range of protection mechanisms and significantly improves system behavior during fail events.