title: The optimization of wireless power transmission: design and realization.
abstract: BACKGROUND
  A wireless power transmission system is regarded as a practical way of solving power-shortage problems in multifunctional active capsule endoscopes.
  
  
  METHODS
  The uniformity of magnetic flux density, frequency stability and orientation stability are used to evaluate power transmission stability, taking into consideration size and safety constraints. Magnetic field safety and temperature rise are also considered. Test benches are designed to measure the relevent parameters. Finally, a mathematical programming model in which these constraints are considered is proposed to improve transmission efficiency. To verify the feasibility of the proposed method, various systems for a wireless active capsule endoscope are designed and evaluated.
  
  
  RESULTS
  The optimal power transmission system has the capability to supply continuously at least 500 mW of power with a transmission efficiency of 4.08%.
  
  
  CONCLUSIONS
  The example validates the feasibility of the proposed method. Introduction of novel designs enables further improvement of this method.
authors.affiliation: 820 Institute, Department of Instrument Science and Engineering, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, People's Republic of China. jiayege@hotmail.com
authors.forename: Zhiwei
authors.initials: Z
authors.lastname: Jia
authors.forename: Guozheng
authors.initials: G
authors.lastname: Yan
authors.forename: Hua
authors.initials: H
authors.lastname: Liu
authors.forename: Zhiwu
authors.initials: Z
authors.lastname: Wang
authors.forename: Pingping
authors.initials: P
authors.lastname: Jiang
authors.forename: Yu
authors.initials: Y
authors.lastname: Shi
mesh_terms: D053705:Capsule Endoscopes / Q000706:statistics & numerical data; D053704:Capsule Endoscopy / Q000379:methods* / Q000706:statistics & numerical data; D011211:Electric Power Supplies / Q000009:adverse effects / Q000706:statistics & numerical data; D004574:Electromagnetic Fields / Q000009:adverse effects; D004867:Equipment Design; D004869:Equipment Safety; D006801:Humans