System modeling and analysis of single-phase current regulation module

This paper presents the system modeling and analysis of the single-phase current regulation module (CRM) in continuous-conduction-mode (CCM) at steady state for use in the electrical discharge machines (EDMs). Based on the equivalent model of the three-terminal PWM switching cell, the small-signal equivalent circuit models of the single-phase CRM are obtained to derive the corresponding open-loop transfer functions, including control-to-output, line-to-output, output admittance, and input impedance. The derived theoretical transfer functions are verified with the measured results of a prototype circuit.