On Frequency-Response Measurements of Power-Electronic Systems Applying MIMO Identification Techniques

Switched-mode converters are often the key to operating various electronic systems in everyday life. This means that the reliable operation of the converters is of prime importance and that the functioning must be verified during both the design phase and production. Recent studies have shown that the converters can be fully characterized by a set of frequency responses that can be efficiently used to validate the operation of the converters and analyze the related systems. Several methods have been proposed for quickly and accurately measuring the frequency responses, but surprisingly, the use of multiple-input multiple-output (MIMO) identification techniques has not been considered. Applying MIMO identification techniques, the operating conditions of a converter can be kept constant during the frequency-response measurements, and the overall measurement time can be further shortened. This paper reviews the techniques and proposes an implementation setup. The presented techniques provide efficient means to characterize the switched-mode converters during one measurement cycle. The methods can be used for example in field-programmable gate-array-based controller implementation and in fast online analysis. Experimental measurements are shown from a high-frequency switched-mode converter.