Reducing stress in power amplifiers
: trapezoidal current shape with multilevel topology

  • R.A.J. Hermsen

Student thesis: Master


Soft switching power amplifiers have the disadvantage of high current stress on power components. High output current and resonant operation can result in high peak currents and high di/dt, compromising reliability. This paper proposes a technique using multilevel topology with the flying capacitor as current source, reducing the voltage and current stress in softswitching power amplifiers. The intermediate level in multilevel topologies is often active only a short time for commutation of the switchnode. When the capacity of the flying capacitor is increased, it can be actively used as a current source which results in a trapezoidal current shape with lower peak current and thus lower RMS current, making the power amplifier more efficient. A power amplifier prototype is designed and built to demonstrate this technique.
Date of Award28 Feb 2014
Original languageEnglish
SupervisorJorge L. Duarte (Supervisor 1) & Jeroen van Duivenbode (External coach)

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