Patent ID: 7259542

Claim:
An apparatus for controlling a Direct Current (DC)/DC converter which controls energy flow between a first DC source and a second DC source, comprising: a voltage controller for generating a current command value for an input current of the second DC source; one or more subtractors for generating differences between the current command value and measured currents of respective phases of the DC/DC converter; one or more fundamental component current controllers for generating fundamental component control voltage command values of the respective phases of the DC/DC converter; a first coordinate transformer for transforming the generated differences into values in an orthogonal stationary coordinate system; a resonance current component extractor for extracting resonance current components from the transformed values in the orthogonal stationary coordinate system; a resonance frequency tracker for estimating resonance frequency variation from the extracted resonance current components and feeding the estimated resonance frequency variation back to the resonance current component extractor; one or more resonance component current controllers for generating voltage command values in the orthogonal stationary coordinate system; a second coordinate transformer for generating resonance component control voltage command values for the respective phases of the DC/DC converter using the voltage command values in the orthogonal stationary coordinate system; one or more adders for generating final voltage command values by adding each of the fundamental component control voltage command values of the respective phases to each of the corresponding resonance component control voltage command values; and a Pulse Width Modulation (PWM) signal generation unit for generating a PWM signal for controlling the DC/DC converter based on the final voltage command values.