A wireless power transmission system for robotic capsule endoscopy: Design and optimization

Abstract

This paper presents an inductive coupled wireless power transmission (WPT) system for powering an endoscopic robotic capsule. The proposed WPT system was designed and optimized through manipulation of the core material, the quality factor (Q) and the load impedance matching of the receiving coil (RC). A MnZn ferrite core with high initial permeability was employed. The Q of the 3D RC was optimized by choosing an optimum number of strands and turns. At the optimum design condition the system was able to deliver at least 376 mW of usable power to the load when magnetic field (H-field) of 105 A/m was applied at the frequency of 250 kHz. The uniformity of H-field generated by the power transmitting coil (PTC) was sufficient to achieve 86% stability of received power. The proposed system reduces the required level of H-field by 50% and increases the load power by 22.3% as compared to the existing study.Index Terms -Wireless power transmission (WPT), robotic capsule endoscopy, inductive coupling, quality factor (Q), 3D receiving coil.

Towards a Miniaturized 3D Receiver WPT System for Capsule Endoscopy

“…The CSE of the WPT system was 0.7% with the PA, multi-TX WPT link, and Shottky diode-based bridge rectifier displaying respective efficiencies of 91%, 1%, and 75%. For a total input power of 10 W, i.e., input of 5 W for unit TX circuit, an output power of 70 mW is achieved which is higher than current commercial CE [43,44]. The proposed system can supply approximately 50 mW of power inside the phantom in the worst cases of angular and translational misalignment.…”

Miniaturized 3-D Cross-Type Receiver for Wirelessly Powered Capsule Endoscopy

“…The final output power is 90 mW for a total input power of 10 W, where 5-W input power is supplied in each TX circuit. The current commercial CE typically requires around 30 mW of power [43], [44]. In the worst-cases of angular and translational misalignment of the proposed WPT link, the achievable output power is still 70 mW.…”

Near‐field wireless power transfer used in biomedical implants: A comprehensive review

“…Basar et al. [118] introduced an IC‐WPT. The transmitting unit contains a Helmholtz transmitting coil (40 cm in diameter) and a class‐E power amplifier as a gate driver.…”

“…(a) Proposed transmitting coil in [118]. (b) Proposed receiving coil in [118] (c) Proposed modified Helmholtz coil as a transmitting coil in [119]. (d) Proposed receiving coil in [119].…”