High-performance fans are rapidly evolving toward higher speeds, greater airflow, lighter designs, longer battery life, lower noise, and improved safety. Traditional enclosed motor-control ICs with application-specific functions can no longer meet these demands because they offer limited tuning flexibility and may face supply-chain risks.

To meet the key requirements of high-performance fans, including smooth startup, low noise, and compact design, Geehy has introduced two reference designs:

• G32F031 Low-Voltage Single-Cell Sensorless Trapezoidal High-Speed Fan Solution

• G32M3101 Low-Voltage 2S/4S Sensorless Trapezoidal High-Speed Fan Solution

Both solutions deliver high speed, strong air pressure, low noise, stable speed control, and smooth startup and shutdown. Their highly integrated hardware can reduce overall BOM costs by 20%–30%. Combined with Geehy’s self-developed motor-control algorithm platform, these solutions can shorten development cycles and accelerate time to market.

G32F031 Low-Voltage Single-Cell Sensorless Trapezoidal High-Speed Fan Solution

Block Diagram

• Built around Geehy’s next-generation G32F031 motor-control MCU, this solution uses sensorless trapezoidal control for smooth operation at high speed and high torque.

• A high-speed comparator provides back-EMF zero-crossing detection, while hardware overcurrent protection enables accurate and reliable motor commutation.

• An integrated operational amplifier eliminates the need for an external op amp and supports high-precision current sensing.

• The advanced timer provides complementary PWM outputs that can directly drive PN power transistors, ensuring continuous and stable motor operation.

• Supports speeds of up to 120,000RPM for strong airflow and high air volume.

• Provides a 100% startup success rate and accurate multi-level speed switching for fast airflow adjustment and response.

• Supports multiple protection functions, including overvoltage, undervoltage, overcurrent, phase loss, locked-rotor, and overtemperature protection.

G32F031 Single-Cell High-Speed Fan Demonstration

Measured Prototype Parameters

• Operating frequency: 1.19kHz, corresponding to a calculated speed of 71,400RPM. 

Note: Test results depend closely on the supply voltage.

G32M3101 Low-Voltage 2S/4S Sensorless Trapezoidal High-Speed Fan Solution

Block Diagram

• Built around the G32M3101 motor-control SoC, this solution integrates an MCU, gate driver, LDO, operational amplifier, and comparator. This reduces external components and lowers BOM costs.

• It uses a sensorless trapezoidal-control algorithm with flexible parameter tuning.

• An IPD-free, three-stage soft-start sequence and adaptive commutation algorithm provide smooth, vibration-free startup, quiet high-speed operation, and stable running.

• Hardware zero-crossing detection, dynamically corrected commutation logic, and high-precision ADC sampling allow the solution to adapt startup parameters to different lithium-battery charge levels.

• Integrated protection functions include locked-rotor, overcurrent, undervoltage, overvoltage, overtemperature, and hardware braking protection, ensuring safe and reliable long-term operation.

G32M3101 2S/4S High-Speed Fan Demonstration

Measured Prototype Parameters

• Operating frequency: 1.47kHz, corresponding to a calculated speed of 88,200RPM.

Note: Test results depend closely on the supply voltage.

• Actual voltage: 12V; current: 4.2A; measured power: 50.2W.

Note: Test results depend closely on the supply voltage.

Geehy G32M3101 Motor-Control SoC

The G32M3101 features a Cortex-M0+ core operating at up to 64MHz. Built-in DIV/MULT algorithm accelerators support efficient sensored or sensorless FOC vector control. The device integrates a 40V 3P+3N gate driver and a 5V/60mA LDO, providing a high level of hardware and software integration. This reduces development complexity and helps high-performance fan projects lower costs, improve efficiency, and achieve rapid mass production.

Geehy G32F031 Motor-Control MCU

The G32F031 features a Cortex-M0+ core operating at up to 64MHz. Built-in DIV/MULT/CRC algorithm accelerators support low-latency, high-efficiency sensored or sensorless FOC vector control. The MCU integrates a 12-bit ADC, operational amplifier, and comparator, providing the computing power, functions, and resources required for high-speed operation while shortening the product development cycle.