Fast Frequency Response Measurements of Switched-Mode Power Supplies

Switched-mode converters are extensively used in powering various electronics loads and processes. The proper functioning of those processes may be vital for every day life in society. Therefore, reliable operation of the converters is naturally of prime importance and actions to verify their quality are required. It has been shown lately that the main deficiencies in the verification process are related to the dynamics of the converter which can be characterized by a certain set of transfer functions. This book investigates frequency response measurement methods by means of which the transfer functions can be identified fast and accurately. Various binary sequences are applied as the excitation signals and the transfer functions are identified from the measurement data with correlation-based techniques. The proposed techniques can be used to develop various frequency-response-based applications both in development phase and in full scale production of switched-mode converters. Possible applications could be controller design, quality assessment and system validation.