TIDUF84 June   2024

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 Key System Specifications
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
    3. 2.3 Highlighted Products
      1. 2.3.1 UCC28810
      2. 2.3.2 MCF8315
      3. 2.3.3 MSPM0L
      4. 2.3.4 MSPM0C
  9. 3System Design Theory
    1. 3.1 MCF8315 Design
      1. 3.1.1 Power section
      2. 3.1.2 GPIO section
    2. 3.2 ACDC Design: Single Stage PFC
    3. 3.3 Host MCU Design
  10. 4Hardware, Software, Testing Requirements, and Test Results
    1. 4.1 Hardware Requirements
      1. 4.1.1 Hardware Overview
      2. 4.1.2 TIDA-010951 PCB
    2. 4.2 Software Requirements
    3. 4.3 Testing requirements
    4. 4.4 Test Setup
    5. 4.5 Test Results
      1. 4.5.1 Power Management in TIDA-010951
      2. 4.5.2 UCC28810 Based Single Stage PFC
      3. 4.5.3 BLDC Residential Fan Operation Using MCF8315C
        1. 4.5.3.1 Power-Up Sequence
        2. 4.5.3.2 Forward Windmilling (ISD Forward Resync)
        3. 4.5.3.3 Reverse Windmilling (ISD Reverse Resync)
        4. 4.5.3.4 Direction Reversal
        5. 4.5.3.5 Fan Acceleration/Deceleration
      4. 4.5.4 Thermal Performance
  11. 5Design and Documentation Support
    1. 5.1 Design Files
      1. 5.1.1 Schematics
      2. 5.1.2 BOM
    2. 5.2 Tools and Software
    3. 5.3 Documentation Support
    4. 5.4 Support Resources
    5. 5.5 Trademarks
  12. 6About the Author
  13. 7Recognition

1 System Description

The use of brushless DC (BLDC) motors has been steadily increasing in applications where a wide range of speed variation is required and BLDC motors are highly efficient as compared to induction motors. For very low power applications, using low voltage motors offers several advantages, such as operation over universal voltage input conditions, cost savings on motors and passives, and a compact printed circuit board (PCB). Additionally, highly integrated and protected low voltage motor driver integrated circuits (ICs) make the motor easier to control and more efficient. However, the use of a low voltage motor does require an efficient and low-cost AC-DC conversion stage. The TIDA-10951 design addresses this application requirement in a simple and efficient manner. The PCB also integrates an efficient and feature rich motor controller stage, which enables customers to use this platform for applications such as ceiling fans, exhaust fans, ventilation fans, oven fans, and other low-power BLDC drives used in home and industrial appliances.

As Figure 1-1 shows, a buck power factor correction (PFC) power stage converts the 85V to 265V, AC input to a regulated 24V DC output. This design utilizes a UCC28810 PFC IC to control this power stage. The 24V DC generated by the power stage is used to power the three-phase sensorless FOC BLDC motor controller MCF8315/MCF8316. This drives the motor to control the speed. The MCF8315/MCF8316 controller also generates a 3.3V supply, which powers the microcontroller (MCU). The MSPM0L/MSPM0C MCU transmits the speed reference to the MCF8315/MCF8316 controller in the form of a pulse-width modulation (PWM) signal producing a duty cycle proportional to the desired speed. This PWM signal is based on the signal received from the infrared (IR) sensor, which in turn is activated by a general-purpose IR remote control. Customizing the firmware of the MCU is easy for any given remote-control data format.

TIDA-010951 TIDA-010951 Block Diagram Figure 1-1 TIDA-010951 Block Diagram

The MCF8315/MCF8316 is a highly integrated and protected single-chip FOC motor controller with integrated sensorless FOC algorithm, gate driver, and FETs, capable of delivering constant torque under varying load conditions. The MSPM0L/MSPM0C is a general-purpose microcontroller from TI's portfolio of highly integrated, low-cost Arm® Cortex®-M0+ MCUs allowing this system to receive IR signal, control motor speed and direction, and get motor status via I2C. The total design is optimized with high efficiency and a small PCB form factor to easily fit into the motor.