TMS 320 TMS320: Survey of other people's design using this controller as RTC

 2022 Cheng, Chinese academy of sciences:  General purpose controller for multiple types of magnetic bearing rotorsystems

1. Gap signal conditioning circuit accepts input voltage of -20 Volt to + 20 Volt.
2. Gap signal conditioning circuit also accepts 20 milliampere current input .
3. Gap signal conditioning circuit also accepts Rs 485 format signal inputs.
4. This signal conditioning circuit can receive input from eddy current gap sensor, inductive gap sensor and capacitive gap sensors.
5. The power amplifier of the controller supports half bridge and full bridge current control.
6. The power amplifier has capability to produce 2 state pwm and 3 state pwm
7. Current loop is PI controlled.
8. For current control, necessary current sensing elements are in the controller itself.
9. Position loop is Linear Active Disturbance Rejection Control (LADRC) based.
10. Signal conditioning circuit : We have only Usax as our sensor is voltage output. Isax is zero for us. input given to the DSP is Udsp. 
    
    
    
11. If the magnetic bearing is a permanent biased bearing, then both positive and negative currents are required in actuator. In that case we need full bridge rectifier to reverse the direction of the current.
12. For active magnetic bearing with only active part, without any permanent bias, unidirectional power amplifier is sufficient only positive current needs to be generated
13. For 2 level PWM, only charging and discharging mode of operation is present. 
14. Only one pwm wave is needed to control 2 switches on and off simultaneously in 2 level 
15. For 2 level operation of the power amplifier 10 PWM channels are required to run 10 H bridges
16. For 3 level operation of the power amplifier 20 PWM channels are required to run 10 H bridges
17. The authors  use F28377s single core 12 PWM output microcontroller instead of F28379d dual core 24 PWM microcontroller that we are using. Here is a short comparison of both the controllers