SystemC-AMS Heterogeneous Modeling of a Capacitive Harvester of Vibration Energy

This paper presents the results of modeling of a mixed non-linear, strongly coupled and multidomain electromechanical system designed to scavenge the energy of ambient vibra-tions and to generate an electrical supply for an embedded microsystem. The system is operating in three domains: purely mechanical (the resonator), coupled electromechan-ical (electrostatic transducer associated with the moving mass) and electrical circuit, including switches, diodes and linear electrical components. Although only linear networks can be properly modeled in SystemC-AMS, we propose a technique allowing modeling of electrical networks including non-linear components (diodes) as well as time-varying ca-pacitors. The whole system was modeled using two solvers of SystemC-AMS simultaneously: the one allowing TDF (Timed Data Flow) modeling and the one allowing LIN ELEC (linear electrical) circuit analysis. The modeling re-sults are compared with VHDL-AMS and Matlab Simulink models