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US 11,690,142 B2Granted
Induction heating device having improved detection accuracy with respect to material of object
AssigneeLG Electronics Inc.
InventorsKyung Hoon Jung, Dooyong Oh, Byeong Wook Park
Life of this patent
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Abstract
An induction heating device includes: a working coil, an inverter, a current transformer, a current detecting circuit, a voltage detecting circuit, an AND circuit, and a controller. The induction heating device may detect presence or absence of an object and a material of the object based on a magnitude of resonance current applied to the working coil and a phase difference between the resonance current and a voltage applied to a switching element of the inverter.
Claims20
An induction heating device, comprising:
- a working coil;
- an inverter comprising a first switching element and a second switching element that are configured to perform a switching operation and to apply resonance current to the working coil based on the switching operation;
- a current transformer comprising a first coil connected to the inverter and the working coil that are configured to change a magnitude of the resonance current in the first coil;
- a current detecting circuit electrically connected to the current transformer, the current detecting circuit being configured to receive a first resonance current which is the resonance current having changed magnitude and output a first voltage based on the received first resonance current;
- a voltage detecting circuit electrically connected to the inverter, the voltage detecting circuit being configured to receive a switching voltage applied to the second switching element and to output a second voltage based on the received switching voltage;
- an AND circuit configured to receive the first voltage and the second voltage and to output a pulse based on the received first voltage and the received second voltage;
- and
- a controller configured to:
- control the switching operation,
- receive the output pulse from the AND circuit, and
- determine a material of an object on the working coil based on a width of the received pulse.
8 more elements
Dependencies are inferred from the claim text.