Solution of frequency conversion washing machine based on MCU

　　In the overall energy consumption structure of domestic washing machines,the motor energy consumption accounts for 60%-70%.Compared with the traditional fixed-speed motor,DC variable-frequency motor can realize precise speed regulation and dynamic energy control,and has obvious energy-saving advantages.Now it has become the mainstream configuration of high-end washing machines.The key performance of frequency conversion washing machine depends on the motor drive control technology and the performance of the main control chip.Therefore,our company launched a special frequency conversion washing machine solution based on MCU CMS32M65 series,focusing on improving energy efficiency,running stability and intelligent functions,so as to meet the diversified operation requirements of household frequency conversion washing machines.

 

　　The scheme of frequency conversion washing machine relies on the computing power and control ability of high-performance MCU,and is equipped with mature and stable motor control algorithm,which is suitable for all working conditions such as washing,dehydration and speed regulation of washing machine.Double-resistance FOC control technology is adopted to accurately control the running state of the motor and improve the energy utilization rate.Equipped with quick start mechanism,the device has fast response speed,effectively shortening the standby start-up time.Built-in proprietary software weighing algorithm can automatically identify the weight of clothes,intelligently match the washing mode and rotation speed,and reduce ineffective energy consumption.At the same time,it is equipped with the function of optimizing the speed increase of the weak field,so that the transition of the motor in and out of the weak field stage is smooth,and there is no problem of jamming and abnormal sound.In addition,the frequency conversion washing machine scheme integrates multiple protection mechanisms,which can monitor the state of equipment in real time,realize all-round protection of abnormal situations such as overvoltage,undervoltage,overcurrent,phase loss and locked rotor,and greatly improve the operation safety and service life of equipment.

 

　　The CMS32M65 series MCU single chip microcomputer equipped in the scheme adopts industrial ARM M0+core to adapt to the complex operation environment of household appliances.The main frequency of MCU can reach 64MHz,the working voltage covers 1.8V-5.5V,and the working temperature range is-40℃-105℃,so it has strong environmental adaptability.The storage configuration is equipped with 64KB Flash ROM,8KB SRAM and 1KB DATA FLASH,which meets the requirements of algorithm storage and high-speed operation.The MCU is equipped with a variety of hardware peripherals,including multiple sets of general timers,6-channel enhanced PWM modules,bilateral hysteresis analog comparators,gain adjustable programmable amplifiers,and a built-in 12-bit high-speed ADC with a sampling rate as high as 1.2Msps,which can realize high-precision and fast signal acquisition and provide hard accounting support for the precise control and stable operation of the inverter washing machine.