Artery AT32F421 MCU for Smart Home Ceiling Fan Control​

Driven by smart home and green energy trends, ceiling fans are inevitably transitioning from traditional brushed motors to brushless permanent magnet synchronous motors (PMSM). This shift places higher demands on the core controller's computational efficiency, control precision, and reliability. Artery Technology's AT32F421 MCU, leveraging its sensorless Field-Oriented Control (FOC) vector control core and highly integrated architecture, has become a key enabler for ceiling fan controller solutions, addressing the limitations of traditional products and redefining performance ceilings for ceiling fans.

I. Focusing on Ceiling Fan Applications: Building Comprehensive Control Capabilities

The AT32F421 addresses the actual operating conditions of ceiling fans, creating a full-scenario control solution covering startup, operation, and regulation, solving three major pain points of traditional ceiling fans:

1.  Sensorless FOC Control: Balancing Efficiency and Quiet Operation

Traditional square-wave control in ceiling fans suffers from significant current ripple, low efficiency, and noticeable noise. The AT32F421 incorporates sensorless FOC vector control technology, enabling precise motor current distribution without requiring position sensors, achieving "maximum torque output with minimum current," significantly enhancing fan efficiency. Coupled with the Luenberger observer + Q-PLL angle estimation algorithm, it captures the rotor position in real-time, maintaining magnetic field synchronization even at low speeds as low as 30 RPM, preventing motor vibration. Simultaneously, the 2Msps high-speed ADC sampling and high-frequency current loop control suppress current ripple, minimizing operational noise, making it suitable for quiet environments like bedrooms and studies.

2.  Full-Condition Startup: Handling Complex Environments

Ceiling fans often face non-static startup scenarios like forward or reverse wind conditions, where traditional controllers easily fail to start or cause mechanical stress. The AT32F421 employs three-phase voltage vector pulse detection to quickly identify the initial blade angle and rotation direction before startup, supporting startup without reversal from "standstill, forward-wind, or reverse-wind" conditions. It guides the motor smoothly into the target rotation by adjusting PWM signal phase, reducing mechanical wear and extending product lifespan.

3.  Precise Regulation: Meeting Diverse Needs

This MCU supports seamless speed control from 30 to 300 RPM. Utilizing high-resolution PWM signals, it enables continuous speed adjustment, replacing the "stepped" feeling of traditional gear-based regulation. It also features forward/reverse rotation control. By switching the three-phase MOSFET drive phase, it enables summer ventilation (forward) and winter warm air circulation (reverse), expanding the ceiling fan's usability across all seasons.

II. Core Technical Advantages: Solidifying Solution Competitiveness

The hardware architecture and integrated design of the AT32F421 deliver triple value: "cost reduction, efficiency improvement, and enhanced stability" for ceiling fan controllers:

1.  High-Frequency Operation: Ensuring Control Precision

Based on the Cortex-M4 core, the AT32F421 achieves a maximum operating frequency of 120MHz, supporting high-frequency current loop control. The current loop response cycle is reduced to the microsecond level, allowing real-time current adjustment during load fluctuations (e.g., dust accumulation on blades) to prevent speed drop. The high-frequency core also enhances PWM signal processing efficiency, reducing adjustment step size, further optimizing speed smoothness and motor efficiency.

2.  High Integration: Simplifying Circuits and Reducing Cost

Traditional solutions require external comparators and over-current detection circuits, increasing hardware complexity and cost. The AT32F421 integrates a comparator (CMP) that can directly interface with current sense resistors, enabling real-time phase current monitoring and triggering over-current protection (OCP). It also supports flexible single/dual resistor sampling configurations - the single-resistor option reduces component count and cost, while the dual-resistor option improves detection accuracy, catering to different needs.

3.  Comprehensive Protection: Enhancing Reliability

Addressing the long-term operational needs of ceiling fans, the AT32F421 integrates four protection mechanisms: stall protection, over-current, over-voltage, and under-voltage protection. It quickly cuts off output during a stall to prevent motor burnout, while over/under-voltage protection handles grid fluctuations, comprehensively safeguarding the controller and motor, reducing after-sales risks.

As the core chip for ceiling fan controllers, the Artery AT32F421 breaks the limitations of traditional products through technological innovation. It not only meets current green energy and smart home demands but also reserves expansion space for future intelligent upgrades (such as IoT connectivity), making it a preferred solution in the home appliance controller field.

About Mandu Technology

Shenzhen Mandu Technology Co., Ltd. has steadfastly centered its operations on the distribution of high-performance, high-quality, and highly reliable integrated circuit products. Its portfolio encompasses memory chips, differential crystal oscillators, and MCU microcontrollers, while progressively integrating analog signal chain products. The company prides itself on delivering comprehensive and cost-effective solutions to its customers. Its products find applications across a broad spectrum of industries, including but not limited to network communication, industrial control, robotics, medical equipment, personal health, and numerous other fields.

Business: sales@manduic.com

Website: www.manduic.com

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