A push-pull resonant converter with dual coils for Transcutaneous Energy Transfer systems

This paper presents a compact push-pull current-fed parallel resonant converter suitable for implementing a Transcutaneous Energy Transmission (TET) system to power heart assist devices. The new circuit topology integrates all three magnetic components of a conventional current-fed push-pull resonant converter including the DC inductor, phase splitting transformer and primary coil inductor into a coreless dual primary coil configuration, which significantly reduces the size and weight of the system. A stroboscopic mapping model is developed and used to analyse the circuit performance. Experimental results have demonstrated that the proposed converter performs very well and can achieve a DC to AC power efficiency of 90.5% at an output power of 10 W.