Study on the Wireless Energy Supply System in the Implantable Cardiac Pacemaker

In order to prolong the lifetime of the implantable cardiac pacemaker. A power supplying system for the pacemaker based on resonant magnetic coupling wireless power transmission is designed. DDS technology is applied to tune the working frequency of the system through the micro-controller AT89S52, and a square wave signal that generated by AD9850 will be utilized as the signal source of the system after being processed by the invert circuit and driving circuit. Then the SP-type topology of resonant capacitor compensation of the energy wireless transmission is designed. Through rectification, filtering and regulation, the voltage, which is induced by the secondary coil, will be stable enough to power the pacemaker. The experimental results shows that the energy transferring efficiency can be up to 81.03% when the system works at its resonance frequency and the transferring distance is 2cm, which indicates that the design is feasible and effective.