Voltage-Boosted Current-Mode Wireless Power Receiver for Directly Charging a Low-Voltage Battery in Implantable Medical Systems

13.56 MHz Triple Mode Rectifier Circuit With Extended Coupling Range for Wirelessly Powered Implantable Medical Devices

“…On the contrary, [24] is suitable for very low power applications with 50 kHz frequency in single mode operation. Even if [25] operates at 6.78 MHz frequency, it can charge low voltage batteries. Both [16] and [20] offer rectifier circuits in VM and are limited by high couplings.…”

“…In this mode, a series LC tank is used in the receiver side to charge the battery/load. CM is reported in different designs [23]- [25]. While [23] aims to improve voltage conversion ratio, [24] offers a very low output power design which cannot be used for high power applications.…”

“…Furthermore, operation frequencies of 1 MHz [23] and 50 kHz [24] are not suitable for medical applications according to ISM band. In addition to these designs, [25] proposes a voltage-boosted CM operation to charge a 1.1 V battery at 6.78 MHz. However, the single mode studies above, be it VM or CM, cover only a small coupling range resulting from the elimination of alignment magnets.…”

IC-Based Rectification Circuit Techniques for Biomedical Energy-Harvesting Applications

“…In [ 32 ], a near-field capacitive coupling-based wireless powering scheme in the subGHz frequency range is presented, where it could safely deliver up to 100 mW of power to an implant with a peak operating efficiency of over 50%. In [ 33 ], Lee et al proposed a voltage-boosted current-mode wireless power receiver for directly charging a low-voltage battery in implantable medical systems, where the technique is studied to charge low-voltage batteries wirelessly for supplying medical implantable systems. In [ 34 ], an inductive voltage/current mode integrated power management with seamless mode transition and energy recycling is proposed for robust inductive power delivery, based on parasitic bulk diodes of lower voltage drop.…”

Biomedical Implants with Charge‐Transfer Monitoring and Regulating Abilities

“…Therefore, developing wireless chargeable battery in small size and with high biocompatibility is expected to improve the effectiveness of clinical application of wired implantable devices. [ 147 ] Moreover, the wired implant devices are vulnerable to fiber wrapping because of their mismatched mechanical and biological properties, which will decrease their sensitivity and shorten their working life. Therefore, developing nanosized or flexible electrodes with good biocompatibility, high charge injection ability, and good mechanical property matching with the human tissues are crucial to enhance the performance of wired implant devices.…”