Analysis and design of a voltage regulator based on an AC-to-AC converter

[摘要] ENGLISH ABSTRACT:This thesis discusses the analysis and design of a voltage regulator based onan AC-to-AC converter. A background study was performed on the besttopology for the purpose. The chosen topology was analysed and theconverter was designed in detail. A voltage sign-detector and an over-currentdetector were designed and built. They were used for control and protection.Three methods of control were investigated. The first was a slow but reliablemethod of computing the RMS value of the input voltage and then using thatvalue and the RMS value of the desired output voltage to compute the dutyratio of the converter. The second method was fast and is an open-loopcontrol method, where the measured input voltage and a reference value ofthe desired output voltage are used to compute the duty ratio. The thirdmethod is a closed-loop control method in which the input voltage, outputvoltage and the same reference values used in the second method are usedto compute the duty ratio. All of these methods were implemented and tested.

[发布机构] Stellenbosch University