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The National Academy of Sciences of Ukraine

The Institute of Electrodynamics

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V.YA. Hutsaliuk*, I.S. Zubkov
Institute of Electrodynamics of the National Academy of Sciences of Ukraine,
Peremohy, 56, Kyiv-57, 03680, Ukraine,
e-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it

Phase-locked loop (PLL) systems in control circuits of resonant voltage inverters of high-frequency induction heating installations are used for getting the maximal active power in the load and minimal power losses in converter transistors under a wide range of load settings. In the paper, it is shown study results of the Q-factor influence of the voltage inverter’s load series resonant circuit of the induction heating installations on the accuracy of the PLL system. Under low values of the Q-factor, which is, for instance, equal 2, switching current may increase up to 30 % in comparison to that under high Q-factors; this, respectively, increases power losses under transistors switching. To provide optimal modes of their switching it is necessary to lower the transistor control pulse delay time depending on the Q-factor of the inverter load circuit. Reference 8, figures 8.
Key words: induction heating, transistor resonant voltage inverter, phase-locked loop (PLL) system.

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Received 19.09.2019