In recent years, rising demand for better hair care has made high-speed hair dryers a popular category in personal care appliances. Powered by high-speed brushless motors running at over 100,000 rpm, these products use strong airflow instead of high heat to dry hair quickly while reducing heat damage. With negative ion technology, they also help make hair smoother and shinier.

Application Challenges of High-Speed Hair Dryers

• High computing requirements: Driving a motor with an electrical frequency of up to 83kHz requires a very short control cycle, placing higher demands on MCU computing power and real-time performance.

• High device losses: High-frequency switching increases power device losses and temperature rise, requiring components that deliver both high performance and low loss.

• Rotor angle deviation: At high speed, the rotor position changes significantly between sampling and PWM output, which can reduce control efficiency.

• Difficult temperature control: The relationship between triac conduction angle and heating power is nonlinear, making it difficult for conventional algorithms to balance accuracy and response speed.

To meet these market needs, Geehy has introduced the G32F031 high-speed negative ion hair dryer control reference solution. The solution addresses key challenges in high-speed hair dryer applications and supports operation at 110,000 rpm. It also provides multi-level airflow and temperature control, intelligent constant-temperature regulation, negative ion hair care, and multiple protection functions. This helps customers shorten development time, reduce costs, improve production efficiency, and enhance the user experience.

Introduction to the G32F031 High-Speed Hair Dryer Solution

Core Advantages of the Solution

• Uses Geehy’s new-generation G32F031 motor control MCU, which can stably control a motor with an 83kHz electrical frequency at a 20kHz carrier frequency.

• Works with the GHP500N05 low-power Intelligent Power Module (IPM), keeping chip temperature rise within the normal range even at a 20kHz carrier frequency.

• Supports angle compensation to improve rotor position estimation accuracy and enhance motor efficiency.

• Uses an incremental variable-gain PI control strategy. It increases integral action at low conduction angles for faster heating and reduces integral action at high conduction angles to suppress overshoot, achieving better temperature control across the full temperature range.

G32F031 High-Speed Negative Ion Hair Dryer Solution Block Diagram

Core Functions of the Solution

• Precise speed control: Geehy’s self-developed high-speed observer and sensorless FOC algorithm ensure constant-speed motor operation without additional sensors.

• Intelligent air temperature regulation: A triac and zero-crossing detection circuit dynamically adjust heating wire power to accurately control outlet air temperature for constant-temperature hair care.

• Multiple safety protections: Built-in over-temperature, over-voltage, locked-rotor, phase-loss, and over-current protections help prevent abnormal operating conditions.

• User-friendly interaction: Supports gear memory and speed switch design to meet different usage needs.

Core Parameters of the Solution

• AC Input Range：187V~253V

• Current Sampling：Dual-resistor current sampling at 20kHz carrier frequency

• Motor Speed：8000RPM~110000RPM

• Motor Rated Power：120W

G32F031 High-Speed Hair Dryer Solution Board

Overview of motor current waveforms (from startup to shutdown)

• AC: Waveform at 220 V; green indicates motor phase current

Motor startup 40 ms control test waveform

• AC: Waveform at 220 V and 105,000 rpm; green indicates motor phase current

Introduction to the Core Chips in Geehy’s G32F031 High-Speed Hair Dryer Solution

G32F031 New-Generation Motor Control MCU

Designed for small and medium-power motor control in home appliances, the G32F031 offers high efficiency, strong integration, and excellent cost performance. It provides the computing power, functions, and resources required for high-speed operation, helping customers greatly shorten product development cycles.

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GHP500N05 Intelligent Power Module (IPM)

The GHP500N05 is a compact single-chip IPM that integrates a 500V/5A fast-recovery MOSFET and a 600V gate driver. It simplifies peripheral circuit design, saves PCB space, and includes over-temperature protection and shoot-through prevention to ensure stable motor operation.

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Geehy continues to build deep expertise in motor control, offering a full-stack motor chip portfolio covering MCU, driver, and power devices. Together with reference designs for a wide range of applications and Geehy’s self-developed motor control algorithm platform, the company provides complete support from hardware selection and solution implementation to algorithm tuning. This helps customers reduce development difficulty, shorten development cycles, and bring end products to mass production faster.