New modulation strategy for controlled power electronic applications with low switching frequencies

This document describes a new approach to generate binary signals with varying pulse-lengths for the use in power electronics. The novel modulation scheme SB-ZePoC (Zero Position Coding with Separated Baseband) was primarily developed for Class-D audio amplifiers. This modulation scheme has the extraordinary advantage that the signal band is free of harmonic distortion and carrier intermodulation products. SB-ZePoC allows very low switching frequencies compared to conventional Pulse Width Modulation (PWM) schemes. A modified ZePoC scheme with low latency time (LLT-ZePoC) is introduced. Advantages and disadvantages compared to conventional PWM-schemes on the background of power electronics applications will be discussed.