October 2016 Newsletter - Delta DC fans - Pulse-Width Modulation (PWM) technology



PMW Fans


Delta's DC fans technology continues to provide better performance, higher reliability and cost-effective thermal cooling solutions. Pulse-Width Modulation (PWM) is one of the primary reasons Delta fans have a clear advantage over other manufacturers.

PWM regulates the voltage signal between fully on and fully off. It controls the speed of the fan. The main advantage is that power loss in the switching device is very low. When a switch is off, there is practically no current, and when it is on, there is almost no voltage drop across the switch. Therefore, power loss is close to zero.

Delta carries a full lineup of PWM speed control fans with dimensions ranging from 36x36x28mm up to 280x280x80mm.


Benefits of Delta's Advance PWM Control


Delta's unique internal Advance PWM Controllers deliver a variety of advantages:

Advanced soft switching control (available on certain models)

Flexible speed control

Wide PWM frequency range input (30Hz - 30kHz)

Prevents current spikes

High power efficiency

Low switching noise

Low vibration

Extends the service life of the Motor

Available in Axial and Blower Models

PWM Fan Curve - Speed Characteristics with quiet operation

PWM fan curve



PWM Input Signal Wave Form

PWM input signal



Delta Advance PWM Control

PWM control




For more information, please call us 1-866-407-4278, or email: dcfansales.us@deltaww.com