Author(s)

ZiYu Qin, Tu Hong, Lei Shi^*

Affiliation(s)

College of Automotive and Energy Engineering, Shanghai 201804, China.

Corresponding Author

Lei Shi

ABSTRACT

A Simulink/Simscape-compatible device model is developed for system-level simulation of PV DC–DC power conversion, using a vendor-provided SPICE behavioral subcircuit of the EPC2302 GaN power transistor. After an automatic translation from the SPICE netlist to a Simscape description, semantic and syntactic incompatibilities are analyzed and are found to mainly originate from representing voltage-dependent capacitances as parameterized primitive components, which introduces runtime terminal voltages into parameter evaluation and leads to compilation conflicts. To preserve the device dynamic behavior while complying with Simscape semantics, the voltage-dependent capacitances are reformulated as explicit branch-current relations at the equation level, and the smooth fitting structure of the vendor model is retained to enhance numerical robustness. A datasheet-referenced verification workflow is established to assess consistency in static conduction behavior and dynamic capacitance-related characteristics. The resulting model compiles successfully and runs stably in time-domain simulations, providing a practical foundation for system-level transient analysis and loss-trend evaluation of high-frequency GaN DC–DC converters.

KEYWORDS

Photovoltaics; DC-DC converter; Gallium nitride; Circuit simulation; SPICE; Nonlinear capacitance

CITE THIS PAPER

ZiYu Qin, Tu Hong, Lei Shi. Simscape-equivalent modeling and verification of a GaN device spice behavioral model for PV DC–DC system-level simulation. World Journal of Engineering Research. 2026, 4(1): 72-78. DOI: https://doi.org/10.61784/wjer3080.

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