Research on new multi-output LLC resonant converter for high-efficiency and low-cost PDP power module

Abstract

AC-PDP has many desired features as a display device, such as large screen size, wide view angle, fast response, high contrast, thinness, and long life time. Moreover, recently, the power consumption is greatly decreased through the auto power control (APC) technique, and the cost per inch is also reduced by the application-specific integrated circuit (ASIC) technology and the improvement of the panel fabrication process. Therefore, AC-PDP shows the brightest prospect as a flat panel display device. AC-PDP is operated in three periods of resetting, addressing, and sustaining within a sub-field, in order to display the desired images. In resetting period, the wall charges of the overall PDP cells are removed by applying the resetting ramps to the scanning and sustaining electrodes. And then, to create the wall charges at the required PDP cells, the data and scanning pulses are applied to the addressing and scanning electrodes, respectively. If the continuous sustaining pulses are applied between the scanning and sustaining electrodes during the sustaining period, the selected PDP cells emit the intense light and the desired image can be displayed. Therefore, to drive AC-PDP optimally, the various power supplies are required, such as the sustaining, addressing, scanning, resetting, and erasing power supplies. PDP power module includes not only these power supplies but also the logic-board and the audio-amp power supplies. In addition, the boost pre-regulator for power factor correction (PFC) is implemented at input stage. Thus, PDP power module has the complicated structure and the high power rating. Especially, the sustaining and addressing power supplies have the highest power rating of 440W and 140W, respectively. However, as described above, the sustaining and addressing power supplies do not operate at the same time. Furthermore, these power supplies do not have heavy load conditions, that is, one has heavy load condition and the other has light load co...