Random PWM Quiets Noise And Reduces Emissions In Three-Phase Inverter Applications

Focus:

Conventional pulse width modulation (PWM) methods for driving three-phase inverters can produce undesirable effects in industrial applications such as acoustic noise, radio interference, and mechanical vibration. Traditionally, these problems are solved by employing filters to filter out the predetermined harmonic content and mitigate electromagnetic interference. However, random pulse width modulation (RPWM) has been found more effective than traditional methods as it spreads the harmonic content over a wide frequency range, reducing the unwanted effects in three-phase-inverter-fed systems. This article provides details of RPWM signal generation for driving three-phase inverters using the SLG46620 configurable mixed-signal IC. This solution provides a low-cost, space-saving alternative to DSP and FPGA implementations, while also simplifying coding requirements.

What you’ll learn:

• How to implement random pulse width modulation (spread-spectrum switching) in three-phase inverters with a small, low-cost design
• How to implement random pulse width modulation using the SLG46620 configurable mixed-signal IC

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Author & Publication:

Aamir Hussain Chughtai and Muhammad Saqib, Dialog Semiconductor, Lahore, Pakistan, How2Power Today, Oct 15 2018

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