SLLA621A September   2023  – October 2023 MCF8315A , MCF8316A

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Design Challenge 1: Thermal Challenges
    1. 2.1 Causes of Thermal Issues
    2. 2.2 How to Solve Thermal Issues
      1. 2.2.1 Solve the Thermal Problem From Hardware
      2. 2.2.2 Solve the Thermal Problem from Algorithm
        1. 2.2.2.1 MCF8315 Test 1
        2. 2.2.2.2 MCF8315 Test 2
        3. 2.2.2.3 MCF8316 Test 1
        4. 2.2.2.4 MCF8316 Test 2
      3. 2.2.3 Solve the Thermal Challenges From PCB Layout
  6. 3Design Challenge 2: Quick Startup
    1. 3.1 Causes of Quick Startup Issues
    2. 3.2 How to Solve Quick Startup Issues
  7. 4Summary
    1. 4.1 Acknowledgment
  8. 5References
  9. 6Revision History

2.2.2 Solve the Thermal Problem from Algorithm

Although FOC is an efficient motor drive method, using these settings can further optimize the thermal performance:

  1. Reduce the PWM frequency
  2. Increase CSA gain
  3. Turn on dead time compensation
  4. Configuring the PWM modulation scheme to 'Discontinuous space vector PWM modulation'.

Through the previous configuration, the Thermal performance can be improved from the perspective of the algorithm.

In general, Power losses in MCF831xA can be minimized by enabling buck regulator power sequencing, increasing the slew rate of the MOSFET switching, decreasing the PWM output frequency and configuring the PWM modulation scheme to Discontinuous space vector PWM modulation.

The following is test data to show the different algorithm techniques to improve thermals: