Facing the demand of miniaturization and lightweight motor drive market,our company introduced a high integration BLDC(Brushless DC Motor)control scheme with MCU CH641 as the core.This scheme is specially designed for small motor applications such as power tools and portable devices.With the characteristics of single-chip integration of professional pre-drive,12V I/O direct-drive MOS and support for USB PD/Type-C fast charging,the peripheral circuits are greatly simplified,and the reliability of the system is significantly improved,at the same time,the composite requirements of miniaturization,low cost and efficient charging are effectively helped.
 

The main control of the scheme adopts CH641 chip,which is equipped with a self-developed highland barley RISC-V2A kernel,and there is no need to pay the third-party authorization fee,which fundamentally reduces the chip cost.The MCU chip is highly integrated.Besides the core processor,it also has a built-in 12V I/O interface,which can directly drive MOS tubes,LDO regulated power supply,DMA controller,multi-channel ADC and rich timer resources,which perfectly meets the strict timing requirements such as PWM generation,back emf timing and real-time interruption in BLDC control.
 

The MCU CH641 has built-in PD PHY physical layer,which natively supports USB PD and Type-C fast charging protocols,and is compatible with various high-voltage charging protocols such as BC1.2 and DCP.The MCU chip also has multiple protection mechanisms such as over-voltage and over-temperature,and the overall power consumption is low,which greatly reduces the number of peripheral components and realizes the dual simplification of system design and supply chain.
 

Core advantages of MCU single chip microcomputer scheme

1.Highly integrated,saving space and cost.

The single chip design based on MCU CH641 can significantly reduce the PCB area and reduce the cost of materials and management,which is especially suitable for miniaturized products sensitive to volume and cost.
 

2.Reliable non-inductive square wave control

The sensorless square wave control algorithm based on back electromotive force(BEMF)detection is adopted,and the Hall sensor is omitted,which further simplifies the structure and improves the system reliability.
 

3.Excellent dynamic performance

Through the closed-loop control of speed,the motor is ensured to start quickly and reliably,run smoothly and have good dynamic response,and the use experience of end products is improved.
 

4.Comprehensive security protection mechanism

Built-in multiple protection functions such as locked rotor,overvoltage,undervoltage,overcurrent and overload ensure the stability and reliability of the motor system under various abnormal working conditions and prolong its service life.
 

5.Convenient fast charging function and complete support

MCU single chip integrated Type-C fast charging solution,which makes the charging of terminal equipment more convenient and efficient.We can provide complete and customizable production-level solutions,including hardware design,algorithm software and debugging tools,to help customers get their products to market quickly.

Keywords:microcomputer