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Measurement of the flatness of cold rolled steel strip or aluminum foil is a vital aspect of production quality control. Cold lamination control based on the results of this measurement crucially affects production efficiency, but further processes can modify this flatness, and it can be even lost when strip becomes cold. We describe a low-cost flatness(More)
Synchronous rectification (SR) is mandatory to achieve good efficiencies with low output voltages. If the transformer is driven asymmetrically without dead times, self-driven SR (SDSR) is a very interesting solution. However, if the transformer is driven symmetrically, the synchronous rectifiers are off during the dead times and, as a consequence, the(More)
One of the major drawbacks of high-ratio step-up transformers is the high value of their secondary side capacitor. This value is reflected at the primary side giving rise to a non-desirable one. There are some converters [1][2][3] which include this capacitor in the topology and can cope with it, and even more, they need it. Particularly, in high-voltage(More)
The DC/DC buck converter is an interesting solution to implement power factor correction (PFC) in many applications, meeting the IEC 1000-3-2 standard with a low cost circuit. In this paper, an average small-signal model of buck converter realising power factor correction is presented. The model is valid for frequencies lower than the line frequency and(More)
Measuring the flatness of a cold-rolled steel strip or aluminum foil is a vital aspect of production quality control. Cold lamination control based on the results of this measurement crucially affects production efficiency, but further processes can modify flatness, which can be lost when the strip becomes cold. We describe a low-cost flatness measurement(More)
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