Modeling, Analysis, and Development of a Current Decoupling Control High-Precision Converter Under Nonideal Conditions

In order to ensure that the inductors of dual-buck full-bridge converter (DBFBC) can operate in continuous conduction mode (CCM), the bias current and output current are decoupled and controlled independently, and it makes the converter obtain high-precision output current. Present analytical models are established on the ideal conditions and the effect of nonideal conditions on decoupling control is not considered. At first, in order to analyze the mechanism of current error under nonideal conditions, the state-space average model with equivalent parameters of DBFBC is established. Then, the cross coupling caused by incomplete decoupling under nonideal conditions is analyzed, and the expression between equivalent parameters and current error is derived. Furthermore, the features of bias current and output current error caused by cross coupling are analyzed, and the corresponding restraining method is proposed. Finally, the experimental results are presented to verify the theoretical analysis.