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

5.7 Total Harmonic Distortion (THD)

Total harmonic distortion is a single number that interprets output spectrum measurements from the previous chapter. Table 5-3, Figure 5-19 and Figure 5-20 document the results.

Table 5-3 Total Harmonic Distortion
Input type Value Unit
Harmonic signal THD 1.15 %
Modulated PWM signal THD 3.24 %
Total Harmonic Distortion (Harmonic Signal) Figure 5-19 Total Harmonic Distortion (Harmonic Signal)
Total Harmonic Distortion (PWM signal) Figure 5-20 Total Harmonic Distortion (PWM signal)