Automatic HVAC - BLDC blower motor

In Heating, Ventilation, and Air Conditioning (HVAC) systems, the trend is towards temperature control with PWM driven brushless DC motors. Overall system reliability and efficiency is improved compared with linear operation and brushed motors. This delivers significant performance, fuel and CO2 savings over the lifetime of the vehicle.

Block diagram

Design considerations

50 W – 400 W Brushless DC motor drive

  • BLDC preferred for controllability and low power performance

Controlled by 6 MOSFETs operated with PWM

  • puts the focus on switching losses and EMC performance
  • power saving of 100 W on average
  • emission reduction of approx. 0.24 kg CO2 per 100 km.

Applications face a high ambient temperature

Automotive relay replacement - Reliability meets space savings

A relay is often perceived as the ideal device with perfect input/output isolation. Unfortunately, this is not the case. MOSFETs are rapidly becoming the option of choice offer reliability and space savings. 

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