Integrated power management circuit for piezoelectronic generator in wireless monitoring system of orthopaedic implants

Wireless Monitoring System of Orthopedic Implants(WMSoOI), which is employed to detect the situations of implanted materials in patients as artificial joints, is one kind of Smart Biomedical MicroSystems(BMS). This kind of BMS is supplied by little mechanical energy. Due to the limit of input energy, there are a lot of challenges on power converter system, such as efficiency, volume, etc[1][2]. In this chapter, section 2 gives the application background of WMSoOI, and then according to the system requirements, a novel hybrid power management system is proposed in section 3. Section 4 illustrates the concrete circuit design of each block. In section 5, measurement results and simulation results are given. Finally, section 6 is a summary.