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The paper presents a new four-level voltage source converter (VSC). Compared to conventional four-level converters, this proposed converter has fewer components and can be used for a higher power density system in low and medium voltage applications. Its principles and advantages are studied in this paper. The effect of various redundant switching states on the voltages of flying capacitors is analyzed...
This paper proposes a novel two-stage electronic ballast used to supply automotive high-intensity-discharge (HID) lamps with low-frequency square-wave sources. The ballast is composed of a boost-flyback converter with two output windings plus cascaded voltage doublers to boost up the 12V input voltage to a high DC voltage level of 400 V, and a high-frequency combined with low-frequency square-wave-driven...
This paper presents a single-stage electronic ballast for the high-intensity-discharge (HID) lamp with high power factor (PF). The presented ballast consists of a discontinuous-conduction-mode (DCM) operated dual-boost converter to achieve input-current shaping, and a high-frequency combined with low-frequency square-wave-driven half-bridge-type inverter for supplying the HID lamp with low-frequency...
This paper presents a single-stage electronic ballast for the high-intensity-discharge (HID) lamp with high power factor. The presented ballast consists of a discontinuous-conduction-mode (DCM) operated bridgeless boost converter to achieve input current shaping and a high-frequency combined with low-frequency square-wave-driven full-bridge-type inverter for supplying the HID lamp with low-frequency...
This paper presents a novel pixel design for active matrix organic light emitting diode (AM-OLED) displays using nanocrystalline silicon thin-film transistors (TFTs). The proposed pixel design can effectively reduce the variation of its stored display data caused by the leakage current of nanocrystalline silicon TFTs, which can in turn increase the contrast resolution of AM-OLED displays. With a proper...
Series compensation (SC) is one of the effective measures to increase the transmission capacity of 1000kV Ultra High Voltage (UHV) transmission system. Study on UHV SC technique is an urgently requirement along with the development of UHV transmission system. This paper will focus on the calculation and analysis of lightning withstand capability of SC station in order to confirm insulation level of...
For modern display systems, thorough testing of the TFT array is a critical element in yield management. However, for system-on-panel displays which integrate drivers, timing units, and controllers on the same substrate (usually glass) as the TFT array, access to the array data and scan lines is complicated. To reduce the tester complexity, we propose a low area overhead and offset compensated charge...
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