Design of wireless transcutaneous energy transmission system for totally artificial hearts

A wireless transcutaneous energy transmission system has been developed for totally artificial hearts. The complete system includes a dc-to-dc converter, dc-to-high-frequency transfer circuit, a coil-coupling structure, and a high-frequency-to-dc rectifying circuit. The power transfer is stabilized by feedback control of the phase of the input impedance of the resonant circuit. Experimental results showed that the output voltage variation was kept within /spl plusmn/0.4 volts when the coil spacing varied from 6 to 18 mm. The optimized conversion efficiency of this system was about 68% when the output power was 36 watts.