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High Efficiency AC–AC Power Electronic Converter Applied to
High Efficiency AC–AC Power Electronic Converter Applied to

... The aim of this paper is to propose a new topology to improve the efficiency while reducing the power device count for induction heating applications. The proposed topology is based on the series resonant half-bridge topology and requires only two rectifier diodes. The effective output voltage is do ...
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... When the load dynamics do not permit staged compensation switched via a contactor, then this is replaced by a combination of thyristors and diodes. Together with fast data acquisition and control, real switching operations in the range of a few mains cycles are then possible without switching transi ...
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Utility frequency



The utility frequency, (power) line frequency (American English) or mains frequency (British English) is the frequency of the oscillations of alternating current (AC) in an electric power grid transmitted from a power plant to the end-user. In large parts of the world this is 50 Hz, although in the Americas and parts of Asia it is typically 60 Hz. Current usage by country or region is given in the list of mains power around the world.During the development of commercial electric power systems in the late 19th and early 20th centuries, many different frequencies (and voltages) had been used. Large investment in equipment at one frequency made standardization a slow process. However, as of the turn of the 21st century, places that now use the 50 Hz frequency tend to use 220–240 V, and those that now use 60 Hz tend to use 100–127 V. Both frequencies coexist today (Japan uses both) with no great technical reason to prefer one over the other and no apparent desire for complete worldwide standardization.Unless specified by the manufacturer to operate on both 50 and 60 Hz, appliances may not operate efficiently or even safely if used on anything other than the intended frequency.
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