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This paper presents a DC-DC step-down converter, which can accommodate the range of input voltage from VDD to sub-3×VDD voltage. By utilizing stacked power MOSFETs, a voltage level converter, a detector and a controller, the proposed design is realized by a typical 1P6M 0.18 μm CMOS process without using any high voltage process to resolve gate-oxide reliability and leakage current problems. The core...
This paper presents a new low-cost digital control solution that maximizes the AC/DC flyback power supply efficiency. This intelligent digital approach achieves the combined benefits of high performance, low cost and high reliability in a single controller. It introduces unique multiple PWM and PFM operational modes adaptively based on the power supply load changes. While the multi-mode PWM/PFM control...
Design an electrical locomotive 110 V D.C. source with PFC based on the structure of two-stage switching converter. Discuss the design scheme of main circuit and control circuit. Expound the calculation method of the key parameters. The experiments indicate that the device gets good performance on output and reliability. The electric source is appropriate for electrical locomotive and the other similar...
Studies of microtransformer-based switching converters are reviewed in this paper. A multilayered planar device consisting of zigzag-shape coils and Co-Zr amorphous magnetic films is used as the converter's main transformer. A resonant-type microconverter driven at high frequencies (6 MHz) shows excellent characteristics suited to practical applications, including high efficiency (49.5%), high output...
This paper describes a device suitable to control the output of several converters, each voltage regulated and parallel operating with forced load sharing, so that, when failure occurs, it becomes possible to identify and shut-down the failed unit without affecting to other parallel connected units. Undervoltage and overvoltage supervision is garanted by the device to avoid output voltage changes...
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