Abstract:
A modular inverter-based parallel multi-inverter system provides high and extendable power levels for inductive power transfer (IPT). Adjusting the number of paralleled inverters allows for modular power requirements. Parallel inverters use a master-slave scheme for switching-driver signals. Due to modular inverter hardware equality, the proposed circuit topology is naturally robust despite the master-slave scheme. For proper parameters, an inverter’s output phase (current lagging corresponding voltage) is lower than the average of all inverters when its output voltage lags behind others, and vice versa. PI controllers phase-synchronize all inverter output voltages using this method. A three-inverter parallel multi-inverter IPT prototype was designed, built, and tested. Experiments show that the parallel multi-inverter system has good phase synchronization and circulating current suppression. DC-dc efficiency reached 94% at 35.1 kW receiving power. This paper includes a Matlab/Simulink phase synchronization control file.
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