REAL-TIME SIMULATION OF A 20 KHZ PARALLEL-LOADED RESONANT CONVERTER USING AN IBM RISC SYSTEM-6000 MODEL-350

Real-time simulation tools are useful in studying the large-signal beh avior of power electronic converters in a system-level environment, an d can provide a platform for the evaluation of hardware implementation s of control loop designs. This paper presents an approach which allow s real-time simulation of the open-loop performance of a 20 kHz parall el-loaded resonant converter using an IBM RISC System/6000 Model 350. The state equations which describe the converter are transformed to re cursive equations using finite-difference techniques. First- and secon d-order differencing schemes have been investigated and compared. The second-order method is superior to the first-order method because a ti me step of 3.5 mus executes in 3.33 mus with exceptional accuracy and negligible error propagation.