Current Sharing Schemes for Multiphase Interleaved DC/DC Converter with FPGA Implementation

Many multiphase interleaved DC/DC converter requires current sharing with average current control. Conventional current sharing schemes are based on sensing each phase current to provide the current information to the current control loop. Such schemes have drawback of affection by the sensing accuracy of each phase. Additionally, the switch actions in multiphase interleaved DC/DC converter lead to EMI noise which result in further inaccuracy of the current measurement. Thus, an advanced triple current sampling algorithm for multiphase interleaved DC/DC converter is proposed to eliminate sampling inaccuracy and immune to EMI noise. The proposed control schemes are simulated by Matlab/simulink and realized by FPGA implementation. Simulation and experiment results validated the control strategy.