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Sneak Circuits of Power Electronic Converters by Dongyuan Qiu, Bo Zhang

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Chapter 7Sneak Circuit Mode Analysis Method for Power Electronic Converters

7.1 Introduction

According to the definition of a sneak circuit in power electronic converters and sneak circuit phenomena described in Chapters 2–5, the occurrence of sneak circuit phenomenon is due to the current flowing through the sneak circuit paths, and the essence of the phenomenon is a sneak circuit operating mode differing from the normal operating mode. All sneak circuit paths existing in power electronic converters can be found by the sneak circuit path analysis method that was introduced in Chapter 6. But the basic operating unit of the power electronic converter is the equivalent circuit or sub-circuit at every operating stage. Different operating units or sub-circuits are switched in a fixed order during each switching cycle according to the designed control strategy, which constitute the operating mode of the power electronic converter. So it is difficult to know the route of sneak circuit operation or sneak circuit phenomenon of the power electronic converter will be, even if sneak circuit paths in the power electronic converter has been discovered.

This chapter intends to discover all of the operating units or sub-circuits that may exist in the power electronic converter by using some basic graph algorithms [1–3], and then obtains all operating modes in the power electronic converter by assembling the operating units based on the operating principles of the power electronic converter ...

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