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Three-phase gate driver keeps EV batteries quiet and cool
The latest addition to the company’s QuietMotion product is for battery cooling fans and HVAC systems in electric and hybrid vehicles. It  achieves low noise and vibration via a field oriented control (FOC) algorithm which continuously drives sinusoidal current to the load. This helps vehicle manufacturers reduce noise and improve battery life, says the company.

It is because EVs and hybrid vehicles are quieter than vehicles with internal combustion engines, drivers are becoming increasingly sensitive to noise created by components such as cooling fans, explains Steve Lutz, product line director for motor drivers at Allegro. “The A89307’s hardware-based algorithm makes it easier for designers to reduce fan noise while improving cooling performance and increasing miles per charge,” he confirmed.

The hardware-based algorithm requires no external sensors or software development. The user selects parameters using a simple GUI and loads them into the IC’s on-chip EEPROM. There are only five external components required, which means the A89307 helps designers lower material costs by reducing BoM and supporting small system footprints for in-motor PCBs. The integrated algorithm can even eliminate the need for a separate microprocessor, says the company.

Modes of operation include open-loop PWM or fully programmable closed-loop speed control. In closed-loop mode, the customer can program the PWM-to-speed relationship to match the PWM commands provided by an external ECU. Field weakening is included to improve performance at high speed. Low-speed operation and windmilling start-up are also included in the digital algorithm.

The A89307 can also be used in HVAC blowers as well as liquid pumps in traction inverter cooling systems. The external gate drive allows it to drive a range of motor powers up to 500W.

The A89307 is available in a 28L wettable flank QFN package.



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