Effectiveness of Ultra-FRFETTM for the HV-BLU system in LCD TVs

This paper introduces a newly improved MOSFET, ultra-FRFET of which T_rr characteristic is much faster than that of the typical MOSFET and presents its effectiveness when it is applied to HV-BLU system of LCD TVs. The reverse recovery time, T_rr of ultra-FRFET is shorter than 40 nsec and the peak value of reverse recovery current, i_rr is also much smaller compared to the typical MOSFET\´s, which are sufficient to prevent the MOSFET\´s failures without additional FRDs and diodes in HV-BLU system with a half-bridge resonant inverter topology worked by PWM method. In order to verify the validity, the loss analysis and the experimental for both cases, the conventional solution using typical MOSFETs with additional FRDs and new soution using only ultra-FRFETs are implemented for the HV-BLU of 40" LCD TV. As a result, the effectiveness of ultra-FRFET was verified and the results are presented in this paper.