Introduction
Hair dryers are essential personal care products in every household due to their ability to quickly dry hair and style it. Although these products seem simple, their internal structure is a mechatronic system that requires high precision and reliability in control. The microcontroller unit (MCU) is the “brain” of this system. In hair dryers, the MCU is responsible for driving and regulating the operation of the fan motor, as well as handling fault detection and protection, interaction, and power management. The performance of these chips directly determines the efficiency, noise, lifespan, and user experience of the hair dryer.
After disassembling several popular hair dryers, it was found that the CMS32M5710 microcontroller chip from Micro Semiconductor is widely adopted in consumer-grade hair dryer designs and favored by many major brands. Next, we will introduce this chip, explore why it is so popular, and present some hair dryers that utilize this MCU to provide a better understanding.
Micro Semiconductor
CMS32M5710
The CMS32M5710 is a 32-bit motor microcontroller chip based on the ARM Cortex-M0 core, with a maximum operating frequency of 64MHz and a supply voltage range of 2.1V to 5.5V. It features a single-cycle 32-bit hardware multiplier and a 32-bit hardware divider, efficiently handling numerical computation needs in motor control scenarios.
This chip includes 64KB of FLASH, a 1KB independent FLASH data area, and 8KB of SRAM. It also integrates a hardware CRC check module to ensure FLASH code integrity, provides a 96-bit unique ID and a 128-bit encryptable user ID, and supports FLASH partition protection, highlighting its security and data reliability. The chip has a built-in 48/64MHz high-speed internal oscillator and a 40KHz low-speed internal oscillator, supporting four operating modes: normal, sleep, deep sleep, and stop to optimize power consumption. It features selectable low-voltage reset options of 1.8V/2.0V/2.5V/3.5V and supports a wide operating temperature range of -40℃ to 105℃, packaged in an LQFP48 format to meet various environmental application needs.
Detailed information on CMS32M5710.
Application Cases
Laifen 1400W High-Speed Hair Dryer SE Lite
The Laifen high-speed hair dryer features a 100,000 RPM high-speed brushless motor, producing an airspeed of 19m/s, with two speed settings and four temperature settings available. It also offers optional nozzles for styling needs. The hair dryer is equipped with a high-concentration negative ion generator to neutralize static electricity in hair, enhancing the user experience.
Through disassembly, it was found that the Laifen high-speed hair dryer uses a domestic control scheme, powered by the Jingfeng Mingyuan BP85226 non-isolated chip for the MCU and half-bridge driver chip, with the MCU for controlling the fan operation sourced from Micro Semiconductor, utilizing the CMS32M5710, in conjunction with three Yijingwei half-bridge drivers using EG27710.
The MOSFETs used to drive the motor are the Yongyuan Micro AP5N50BD, and the SCR controlling the heating wire is the JieJie Micro BTA16-600CW. This hair dryer employs discrete MOSFETs paired with drivers, rather than an integrated half-bridge chip. The heating wire’s mica sheet is equipped with an NTC thermistor for temperature detection, along with a bimetallic temperature controller and a thermal fuse for dual overheat protection, ensuring safe use.
Related Reading:
1、Disassembly Report: Laifen 1400W High-Speed Hair Dryer SE Lite
Laifen High-Speed Hair Dryer MINI
The Laifen High-Speed Hair Dryer MINI features a compact design, making it lighter and more comfortable to hold compared to the Laifen SE hair dryer. It is equipped with a new generation 110,000 RPM high-speed brushless motor, achieving an airspeed of up to 19m/s, and comes with a smooth nozzle. This hair dryer also includes a child mode with lower air temperature for safer use.
Through disassembly, it was found that the Laifen High-Speed Hair Dryer MINI uses a domestic chip solution, powered by the Jingfeng Mingyuan BP85226 non-isolated chip for the MCU and three-phase half-bridge chip, with the MCU for controlling the fan operation sourced from Micro Semiconductor, utilizing the CMS32M5710, in conjunction with the Jilin Huami SPE05M50T-C half-bridge chip.
The brushless motor of the hair dryer is driven by a half-bridge chip, integrating discrete MOSFETs and drivers to save space. The heating wire is temperature-controlled by an SCR, with the mica sheet’s NTC thermistor detecting the outlet temperature, and dual overheat protection is provided by a bimetallic temperature controller and a thermal fuse, ensuring safe use.
Related Reading:
1、Disassembly Report: Laifen High-Speed Hair Dryer MINI
Laifen High-Speed Hair Dryer SE 02
The Laifen High-Speed Hair Dryer SE 02 features a 108,000 RPM brushless motor, with improved speed and airflow compared to the previous model. The hair dryer introduces a child mode with lower air temperature and offers multiple speed settings. The head of the hair dryer is equipped with a light ring to visually display the dryer settings, and it comes standard with a magnetic nozzle, meeting daily styling and usage needs without the need for additional purchases.
Through disassembly, it was found that the Laifen High-Speed Hair Dryer SE 02 uses a complete set of domestic chip solutions, powered by the Jingfeng Mingyuan BP85226DF non-isolated chip for voltage reduction, and using the Weide Technology WD78L05 voltage regulator to supply power to the MCU and three-phase half-bridge chip, with the MCU for controlling the fan operation sourced from Micro Semiconductor, utilizing the CMS32M5710.
The brushless motor of the hair dryer is driven by the Jilin Huami SPE05M50T-C three-phase half-bridge chip, integrating discrete MOSFETs and drivers to save space. The heating wire is temperature-controlled by an SCR, with the mica sheet’s NTC thermistor detecting the outlet temperature, and dual overheat protection is provided by a bimetallic temperature controller and a thermal fuse, ensuring safe use.
Related Reading:
1、Disassembly Report: Laifen High-Speed Hair Dryer SE 02
Xiao Shi 1600W High-Speed Hair Dryer
The Laifen High-Speed Hair Dryer SE 02 features a 108,000 RPM brushless motor, with improved speed and airflow compared to the previous model. The hair dryer introduces a child mode with lower air temperature and offers multiple speed settings. The head of the hair dryer is equipped with a light ring to visually display the dryer settings, and it comes standard with a magnetic nozzle, meeting daily styling and usage needs without the need for additional purchases.
Through disassembly, it was found that the Laifen High-Speed Hair Dryer HD 02 uses a complete set of domestic chip solutions, powered by the Jingfeng Mingyuan BP85226DF non-isolated chip for voltage reduction, and using the Weide Technology WD78L05 voltage regulator to supply power to the MCU and three-phase half-bridge chip, with the MCU for controlling the fan operation sourced from Micro Semiconductor, utilizing the CMS32M5710.
The brushless motor of the hair dryer is driven by the Jilin Huami SPE05M50T-C three-phase half-bridge chip, integrating discrete MOSFETs and drivers to save space. The heating wire is temperature-controlled by an SCR, with the mica sheet’s NTC thermistor detecting the outlet temperature, and dual overheat protection is provided by a bimetallic temperature controller and a thermal fuse, ensuring safe use.
Related Reading:
1、Disassembly Report: Xiao Shi 1600W High-Speed Hair Dryer
Oufu High-Speed Hair Dryer
The Oufu high-speed hair dryer features a unique linear design, reducing its size by 40% compared to conventional high-speed hair dryers, making it more user-friendly. It is equipped with an 110,000 RPM high-speed brushless motor, offering three speed settings and four temperature settings. The hair dryer includes a plasma generator and NTC intelligent temperature control to better protect hair and maintain moisture balance.
Through disassembly, it was found that the Oufu high-speed hair dryer uses the Chuangxin Micro CM04M50ST half-bridge module for driving the high-speed brushless motor. The internal power supply for the main control MCU is provided by the Jingfeng Mingyuan BP85956D non-isolated buck chip, with the main control MCU sourced from Micro Semiconductor, utilizing the CMS32M5710, and controlling the heating wire and plasma generator through the Quxin Micro QXM3052 optocoupler.
The Chuangxin Micro CM04M50ST half-bridge driver chip integrates a high-performance driver, half-bridge MOSFETs, and bootstrap diodes, significantly reducing the board area compared to traditional drivers and discrete MOSFET solutions, and integrates temperature detection signal output, making it very suitable for high-voltage brushless motor driving, meeting various home appliance applications.
Related Reading:
1、Disassembly Report: Oufu High-Speed Hair Dryer
Summary from Charging Head Network
Through the disassembly of several popular hair dryers, it can be seen that the MCU has evolved into a core component that determines the overall performance and experience of the device. The CMS32M5710 is widely adopted in consumer-grade hair dryers, reflecting manufacturers’ preference for solutions that offer high cost-performance and rapid mass production, particularly those optimized for motor control, ADC sampling, and low power management with mature software ecosystems.
For overall design, a unified and fully functional MCU can shorten development cycles and reduce BOM complexity, while providing a stable and reliable hardware and software foundation for closed-loop control of airspeed, overheat protection, and multi-level user interaction. This directly enhances product efficiency, noise control, and lifespan, while leaving more room for software-driven differentiation in brand experience.
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