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High frequency power supply is used for inductive heating and contactless inductive power supplies. The experience with resonant inverters for several power classes has shown that those with the higher power (more than 100 kW) may be negatively influenced by the phase difference between voltage and current. The phase response of the inverter load circuit is complicated and depends on many parameters...
Resonant power supply involves the use of zero-current-switching (ZCS) high-frequency inverters. The load can be considered as a bandpass, so that a variation of its resonant frequency (by decreasing of distance of the power consumer) means that the inverter switches at higher current which can damage the IGBTs. This paper proposes a closed-loop-control of the inverter frequency to preserve the ZCS...
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