Microwave technology is now widely used in a variety of medical applications such as cancer treatment and diagnostics. This paper describes the structure of a novel hyperthermia system for biomedical research. The software Ansoft HFSS was used to design a rectangular waveguide applicator. A closed-loop is presented in order to control the output power of the system by the temperature measured on the sample. Initial results from experimental testing are presented. In these results, it is shown that the water temperature can be increased from 21ºC to 40ºC in 12 minutes. As a result, it has been tested that the system works properly. The next step will be to apply the system to melanoma cancer cells.
The double conversion circuits are widely used as motors drivers, UPS's, Active filters, etc. As its name indicates, there are two types of conversions in this system, the AC/DC and the DC/AC conversion. In this paper the results obtained of the implementation of a double conversion system AC/DC/AC are presented. For the AC/DC conversion a topology with power factor correction (PFC) is used, which is controlled by the new technique OCC (One Cycle Control). The previously mention technique showed similar results in comparison with the traditional control technique "The Multiplier based approach", but with the advantages of less complexity and reduction in component count. In the DC/AC conversion an inverter circuit with the modulation technique SPWM was implemented, in which we obtained a regulated output AC voltage and a low harmonic content.
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