Black-box modeling of DC-DC converters based on transient response analysis and parametric identification methods

Abstract

Today, "black-box" behavioral models of power converters are becoming interesting for system-level analysis. These models can be used to evaluate the response of power electronics systems which are composed of commercial converters, since they can be fully parameterized by analyzing the actual converter response. In this paper a new identification method of "black box" models for DC-DC converters is presented. This method is based on the analysis of the step transient response of the converter, which is obtained by means of simple experiments. The identification of the model is carried out using well established fitting algorithms, which can be applied using commercial tools. I.978-1-4244-4783-1/10/$25.00 ©2010 IEEE

Power Supply on Chip (PwrSoC) model identification using black-box modeling techniques

“…A similar investigation has been reported in [1] but is focused on more traditional switch mode power supplies. This work extends that investigation into the PwrSoC realm of power conversion technologies.…”

“…As suggested by [1], system identification from transient response data requires that two experimental tests be conducted, namely, the input terminal excitation test and the output terminal excitation test. Each test is conducted over a wide set of operating conditions that are defined by the input voltage, output voltage, and output current.…”

“…MATLAB's System Identification Toolbox is used extensively in the parameter estimation algorithm and was also used in previous work as described in [1]. The system identification algorithm is, first, responsible for preprocessing the raw experimental transient data collected at the test bench.…”

“…The generic small-signal model structure is that of a two-port g-parameter network, comprised of four dynamic models: input admittance ) (s Y i , reverse The two-port network model utilizes dependent voltage and current sources to model dynamics that are reflected across the converter along with equivalent admittances and impedances to emulate the dynamic behavior found in the input and output networks. Therefore, standard circuit techniques are applied and by Kirchhoff's Voltage Law and Kirchhoff's Current Law a mathematical relationship between each of the four parameters is obtained and expressed in (1) and (2).…”

Un-terminated, low-frequency terminal-behavioral d-q model of three-phase converters

“…This modeling is very well understood and applied to dc-dc converters [6][7][8][9][10] due to the easiness of performing small-signal measurements and existence of the operating point. This concept has even been further extended to address nonlinear behavior [11,12] and EMI [13,14].…”