Inverter/rectifier technologies on WPT systems

Inverter/rectifier technologies on WPT systems

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This chapter introduces a design theory of optimal magnetic-coupling wireless power transfer (WPT) systems from circuit theory viewpoint. WPT systems are generally divided into three parts: DC/AC inverter, coupling part, and AC/DC rectifier. For designs of the high-efficiency WPT systems, it is important to reduce power losses in each part. This chapter also introduces high-efficiency DC-AC inverters and AC-DC rectifiers, which achieve high power conversion efficiency at high frequencies, in particular, due to soft-switching-condition satisfactions. It is, however, not sufficient even if each part is optimized individually. Because a certain part affects other parts, it is quite important to design the optimal WPT system as an integrated system consisting of three parts, which is shown through a design example of the class-E2 WPT system.

Chapter Contents:

  • 6.1 Introduction
  • 6.2 WPT system construction
  • 6.3 General theory of optimal WPT system designs
  • 6.3.1 Coupling coils
  • Self-inductance of air-core solenoid
  • Mutual inductance
  • Equivalent series resistance
  • 6.3.2 Optimal design of coupling part
  • Impedance transformation of rectifier and transformer
  • Efficiency of coupling part
  • Optimal coupling part design and secondary resonance
  • 6.3.3 Design strategies of rectifier and inverter
  • 6.4 High-efficiency rectifier
  • 6.4.1 Class D rectifier
  • 6.4.2 Effects of diode parasitic capacitance
  • 6.4.3 Class E rectifier
  • 6.4.4 Class E/F rectifier
  • 6.5 High-efficiency inverters
  • 6.5.1 Class D inverter
  • 6.5.2 Class E inverter
  • 6.5.3 Class DE inverter
  • 6.5.4 Class E/F inverter
  • 6.5.5 Class φ inverter
  • 6.6 Design example of optimal WPT system
  • 6.6.1 Optimal design for fixed coil parameters
  • Receiver part design
  • Class E inverter design
  • 6.6.2 Optimal WPT system design
  • 6.7 Conclusion
  • References

Inspec keywords: inductive power transmission; invertors; zero voltage switching; radiofrequency power transmission; zero current switching; switching convertors; rectifying circuits

Other keywords: class-E2 WPT system; circuit theory; AC-DC rectifier; optimal magnetic-coupling wireless power transfer systems; power conversion efficiency; soft-switching-condition satisfactions; inverter-rectifier technologies; DC-AC inverter; power losses reduction; high-efficiency WPT systems

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