As various applications of smart homes are deeply rooted in people's hearts, the range hood revolution is getting closer and closer to users. As the entrance and key core of the "smart kitchen", the smart range hood is paying more and more attention to the requirements of consumers in terms of safety and convenience. The intelligent range hood FOC control scheme developed by Beineng International helps the range hood to realize automatic speed regulation, liberate manpower, reduce noise and save energy as much as possible. upgrade.

This solution is applied to a range hood. It can quickly detect changes in the amount of oil fume, control the fan gear in real time through an algorithm, without manual switching, automatically adjust the speed of the fan (motor) according to the actual air quality. Using FOC control mode, mute and efficient.

System Block Diagram

       This demo board consists of 3 parts, namely:

      • Air quality sensor: Continuously collect air quality information in the ambient air and indicate the current smoke concentration in TVOC equivalent.

      • Main control & motor control: analyze and process the collected TVOC value, and then linearly control the speed value of the FOC special control chip to control the start and speed adjustment of the fan.

      • Fan: According to the drive work of the FOC special control chip, the suction power of the range hood is controlled by adjusting the speed of the speed.

      The linkage control of the entire system achieves the purpose of controlling the suction power in proportion to the value of the oil smoke.

Typical application system block diagram based on FOC special control chip :

Program features

      • The IAQ-core air quality sensor automatically collects air quality data, without the need for the master to send work commands, and can read the data when necessary.

      • It can analyze 125-600ppm TVOC equivalent and 450-2000ppm CO2 equivalent.

      • The main control part automatically detects the current environmental fume concentration every second and stands by when there is no fume; when there is fume, it automatically controls the start and suction power of the range hood according to the amount of fume, which can directly eliminate the manual operation and realize the purpose of intelligent range hood

      • Use the FOC special control chip to control the BLDC motor, save the main control resources and eliminate the developer's handling of complex FOC drive control, reduce the development cycle and cost, and promote the application products to the market faster.

      • Simple circuit design can save hardware cost.

IAQ-core electrical parameters

      • Working voltage: 3.3V ± 0.1V

      • Working current: 20mA

      • CO2 equivalent detection range: 450-2000ppm

      • TVOC equivalent detection range: 125-600ppm

      • Working temperature: 0-50 degrees Celsius

      • Warm-up time: 5min

      • Working humidity: 5-95%

FOC special control chip

      • Supply voltage: 3.3V

      • Working current: 20mA

      • Working temperature: -40-150 ℃

      • Output type: UART / I2C

      • Typical power consumption: 100mW

      • Internal clock: 100MHz

Target application

      • Intelligent cooker hood, household air purifier, etc.