Abstract—Induction
heating (IH) technology is nowadays widely present in domestic appliances
because of its cleanness, high efficiency, and faster heating process. All of
these advantages are due to its heating process, where the pot is directly
heated by the induced currents generatedwith a varyingmagnetic field.As a
result, the glass where the pot is supported is not directly heated and,
consequently, efficiency and heating times are improved. IH systems are based
on dc-link inverters to generate the required alternating current to feed the
inductor. Usually, resonant converters are used to achieve higher efficiencies
and power densities. In such systems, themaximum output power and efficiency
are achieved at the resonant frequency, and the switching frequency is
increased to reduce the output power. As a consequence, in these converters,
the efficiency is also reduced in the low-medium output power range. This paper
proposes the use of the half-bridge inverter in two operating modes to achieve
higher efficiency in a wide output power range. The power converter topology
can be reconfigured by changing the resonant capacitors through
electromechanical relays. As a consequence, the entire efficiency of the
cooking process is improved with a cost-effective procedure.
(Index
Terms—Induction heating (IH), inverter, resonant power conversion.)
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