On October 8, 2015, GreatLink Holding, a leading semiconductor component distributor dedicated to the Asia-Pacific market, announced that its product line has introduced a three-phase Hall sensor brushless DC fan based on Infineon's XMC1302 series microcontrollers. Degree control solution.
Under the current requirements of energy saving and emission reduction, DC brushless motors, as a new motor type, have advantages such as high efficiency and simple control, and are gradually replacing the original AC asynchronous motors with lower efficiency. However, due to trapezoidal wave control, the traditional brushless DC motor has the disadvantage of large commutation noise. But if you change to sine wave control, you can solve the noise problem very well.
The XMC1302 DC brushless blower fan sine wave control system launched by Dalian Dapinjia is mainly composed of Hall signal sampling, speed calculation, speed PI adjustment, and PWM generation. The rotational speed adjustment potentiometer or the upper computer sets the speed reference value through the serial port; according to the Hall signal of the DC brushless fan, the rotor position is estimated and the rotational speed is calculated, and the obtained actual rotational speed value and the given rotational speed enter the rotational speed PI regulator together. The output is the PWM modulation amplitude; the three-phase PWM signal of the drive motor can be calculated through the above PWM amplitude and rotor position information, and the brushless DC fan can be driven through the inverter circuit. The modulation strategy adopted in this scheme is the minimum switching power loss SPWM.
Specifications
The program is based on the Infineon XMC1302 microcontroller. The switching power supply part is designed with Infineon's CoolSETTM F3 series of dedicated integrated ICs (including MOSFETs and their drivers) as the core. The Inverter part uses Infineon's single-tube IGBT and EiceDRIVER driver ICs. This solution can be applied to situations with high control performance and noise.
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