JAJU873 August   2020

 

  1.   概要
  2.   リソース
  3.   特長
  4.   アプリケーション
  5.   5
  6. 1 System Description
    1. 1.1 Medical Respiratory Systems
    2. 1.2 Respirator System Components
    3. 1.3 Key System Specifications
  7. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
      1. 2.2.1 Brushless DC Motor (BLDC)
        1. 2.2.1.1 DRV8323RS BLDC Motor Driver Design Calculations
        2. 2.2.1.2 BLDC Motor Driver Circuit
      2. 2.2.2 Solenoid Valve Drivers
        1. 2.2.2.1 DRV8847 Solenoid Driver Design Calculations
        2. 2.2.2.2 Solenoid Driver Circuit
      3. 2.2.3 Power Tree Architecture
        1. 2.2.3.1 Input protection - overvoltage and reverse voltage
        2. 2.2.3.2 LM5122 Boost Design Calculations
        3. 2.2.3.3 LMR33630 Buck Design Calculations
        4. 2.2.3.4 Secondary Power Stage – TPS62840 3.3V Buck
        5. 2.2.3.5 Secondary Power Stage – TPS7A02 3.3V LDO
        6. 2.2.3.6 Power Tree Circuit
    3. 2.3 Highlighted Products
  8. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Hardware and Software Requirements
    2. 3.2 Test Setup
      1. 3.2.1 Hardware Configuration
      2. 3.2.2 Software Configuration
    3. 3.3 Test Results
      1. 3.3.1 Motor Test Result
      2. 3.3.2 Valve Test Result
      3. 3.3.3 Power Tree Test Result
      4. 3.3.4 Key Test Summary
  9. 4Design and Documentation Support
    1. 4.1 Design Files
      1. 4.1.1 Schematics
      2. 4.1.2 BOM
    2. 4.2 Documentation Support
    3. 4.3 サポート・リソース
    4. 4.4 Trademarks
  10. 5About the Author

3.3.4 Key Test Summary

Both the Wonsmart and Boreasa motors under test were able to achieve an acceleration of 120 kRPM/s (10 kRPM to 40 kRPM in 250 ms) and a deceleration of 150 kRPM/s (40 kRPM to 10 kRPM in 200 ms). The results were only limited by the motor maximum current ratings and other motor specific speed characteristics. The hardware is capable of supporting up to 200 kRPM/s for motors capable of higher current limits and speeds. The valve driver’s turn-on and turn-off times were less than 400 ns, which is faster than the typical application requirement of 5 ms.

This reference design shows how to adapt InstaSPIN-FOC to enable high-speed motor control using TI provided software. This is done by using the special capabilities of the C2000 processor family for advanced system debug capability. This can supplement the simulation effort of the engineers to not need to develop the perfect simulation tool for the system, but simply use the actual hardware to debug the control algorithm issue. This removes the need to build complex simulation algorithms to define specific motor or PCB parasitic effects to the system. The C2000 device can run a full FOC, sensorless, speed, and current closed loop control system up to 1.2 kHz electrically or higher, using TI provided software (for example, MotorWare).