Digital Charge Control of boost converter with constant power machine load

This paper proposes the digital charge control method to boost converter operating with a type of nonlinear load, the constant power load. The constant power load is modeled theoretically, and model parameters are given in detail. Transfer functions of the boost converter with constant power load are deduced, and a small-signal model of the charge controlled current inner loop is presented. The digital charge control method (DCC) is implemented with TMS320LF2407. A novel digital forecasting charge control method (DFCC) is proposed to eliminate the defect of duty-cycle jumping. The system stability and dynamic performance are analyzed thoroughly. Experimental results confirm that DFCC boost converter operating with the constant power machine load can follow the reference stably and rapidly.