Chun-Chieh Fang

Learn More
A novel cost-effective and high-efficiency singleswitch resonant inverter with a power-factor-correction (PFC) scheme is proposed to drive a piezoelectric ceramic transducer (PCT) for an ultrasonic cleaner. The circuit topology is derived by integrating a flyback converter that served as the PFC stage with a Class E resonant inverter for driving a thin PCT(More)
We investigated the process of focusing a radially polarized (RP) light beam through a sub-wavelength annular aperture (SAA). We found that the result was a non-diffraction doughnut-shaped light beam which propagates in free space. After analyzing the electric field component of the focus generated by the SAA structure, we identified the relationship(More)
  • 1