Induction heating apparatus
AssigneesLG Electronics Inc., Ulsan National Institute of Science and Technology
InventorsKyelyong Kang, Gwangrok Kim, Jee Hoon Jung, See Hoon Jung, Hwa Pyeong Park
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Abstract
An induction heating apparatus according to an embodiment of the present specification comprises a main control circuit for adjusting the capacitance of the variable capacitor circuit according to a driving mode of the inverter circuit determined on the basis of a load resistance value of a container placed on the working coil and adjusting the magnitude of the direct current link voltage according to a final voltage value calculated on the basis of an equivalent resistance value of the container and the working coil and a required power value for the working coil.
Claims15
An induction heating apparatus, comprising:
- a rectifier circuit configured to rectify an alternating current (AC) input voltage supplied by a power source, and to output a rectified voltage;
- a power factor correction (PFC) circuit configured to be driven by a PFC driving signal, and to control and output power factors of the rectified voltage and an output current from the rectifier circuit;
- a direct current (DC) link capacitor configured to smooth a voltage output from the PFC circuit and to output a DC link voltage;
- an inverter circuit comprising a first switching element, a second switching element, a third switching element, a fourth switching element, an inductor, and a variable capacitor circuit, and configured to be driven by an inverter driving signal and to convert the DC link voltage into an AC voltage for driving a working coil;
- and
- a main control circuit configured to:
- determine a driving mode of the inverter circuit by sequentially changing a driving frequency of the inverter circuit from a first predetermined driving frequency to a subsequent predetermined driving frequency until a calculated load resistance value satisfies a predetermined reference resistance value, which includes:
- calculating a load resistance value of a container placed on the working coil at each driving frequency, and
- comparing the load resistance value of the container with the predetermined reference resistance value;
- adjust a capacitance of the variable capacitor circuit depending on the driving mode of the inverter circuit;
- and
- adjust a magnitude of the DC link voltage depending on a final voltage value calculated based on an equivalent resistance value that is a resistance value in which the load resistance of the container and a resistance of the working coil are added and a required power value of the working coil.
Dependencies are inferred from the claim text.