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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

Highlighted components are Nexperia focus products

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

MOSFET and GaN FET Handbook

Drawing on over 20 years’ of experience, the MOSFET and GaN FET Application Handbook: A Power Design Engineer’s Guide brings together a comprehensive set of learning and reference materials relating to the use of MOSFETs and GaN FETs in real world systems.

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Driving efficiency takes pole position

Today’s cars are undergoing the greatest transformation the industry has seen. Continued electrification is resulting in significant change from the engine right through to the cloud. Consistently delivering the right functionality, with the right performance, in the right package is how Nexperia is helping ‘driving efficiency’ win.

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