Simulation of series-parallel resonant DC-DC converter system with DSP based digital control scheme for medical X-ray use

This paper describes a new simulation approach for a DSP controlled series-parallel resonant high frequency DC-DC power conversion system for a medical X-ray tube voltage generator. Software code of the control function in the simulation program is also applicable to software of DSP control based system. This power electronic circuit simulation technique is based on a circuit equation modelled by substituting switch modulated resistors in place of all the active and passive power switches incorporated in the power converter circuit, one state-vector equation described by state-variables for inductors and capacitors, and an algebraic computation method to transform the matrices of the circuit equation into matrices of the state vector equation. Simulation results are illustrated and discussed together with experimental results.