An induction heating device of one embodiment includes a working coil, an inverter including a first switch and a second switch and supplying a resonance current to the working coil, a phase sensing circuit outputting a pulse signal that indicates a phase difference between the resonance current and a switching voltage of the second switch, and a controller calculating a final phase difference between the resonance current and the switching voltage of the second switch, based on the pulse signal, and adjusting an output power value of the working coil, based on the final phase difference.

An induction heating device of one embodiment includes a working coil, an inverter including a first switch and a second switch and supplying a resonance current to the working coil, a phase sensing circuit outputting a pulse signal that indicates a phase difference between the resonance current and a switching voltage of the second switch, and a controller calculating a final phase difference between the resonance current and the switching voltage of the second switch, based on the pulse signal, and adjusting an output power value of the working coil, based on the final phase difference.

An induction heating device according to an embodiment includes an inverter configured to supply an AC current to a working coil and includes a plurality of switches; a drive circuit configured to supply a switching signal for a switching operation of the plurality of switches to the inverter; and a controller configured to control driving of the working coil by supplying a control signal corresponding to a required power value of the working coil to the drive circuit. The controller may drive the working coil based on the required power value, receive a resonance current value of the working coil when the working coil is driven, calculate a container efficiency index based on an output power value of the working coil, the required power value, the resonance current value and a preset limit current value, and control the driving of the working coil based on the container efficiency index.

An induction heating device according to an embodiment includes an inverter configured to supply an AC current to a working coil and includes a plurality of switches; a drive circuit configured to supply a switching signal for a switching operation of the plurality of switches to the inverter; and a controller configured to control driving of the working coil by supplying a control signal corresponding to a required power value of the working coil to the drive circuit. The controller may drive the working coil based on the required power value, receive a resonance current value of the working coil when the working coil is driven, calculate a container efficiency index based on an output power value of the working coil, the required power value, the resonance current value and a preset limit current value, and control the driving of the working coil based on the container efficiency index.

An induction heater device and a method for controlling an induction heating device are provided. The method may include determining a first target frequency of a first working coil corresponding to the drive command for the first working coil, determining a second target frequency of a second working coil corresponding to the drive command for the second working coil, and determining a final drive frequency of the first working coil and a final drive frequency of the second working coil based on the first target frequency and the second target frequency, respectively.

An induction heater device and a method for controlling an induction heating device are provided. The method may include determining a first target frequency of a first working coil corresponding to the drive command for the first working coil, determining a second target frequency of a second working coil corresponding to the drive command for the second working coil, and determining a final drive frequency of the first working coil and a final drive frequency of the second working coil based on the first target frequency and the second target frequency, respectively.

An induction heating apparatus includes a working coil; an inverter configured to perform switching operation to thereby apply a resonance current to the working coil; and a controller configured to provide a control signal with a fixed frequency to the inverter to thereby control the switching operation. The controller changes a pulse width of the control signal based on a predetermined cycle that is set based on a temperature of the inverter.

An induction heating apparatus includes a working coil; an inverter configured to perform switching operation to thereby apply a resonance current to the working coil; and a controller configured to provide a control signal with a fixed frequency to the inverter to thereby control the switching operation. The controller changes a pulse width of the control signal based on a predetermined cycle that is set based on a temperature of the inverter.

An induction heating device includes a working coil, an inverter including a first switching element and a second switching element that are configured to perform a switching operation and to apply a resonance current to the working coil, a snubber capacitor including a first snubber capacitor connected to the first switching element, and a second snubber capacitor connected to the second switching element, a phase detector configured to detect a phase difference between the resonance current applied to the working coil and a switching voltage applied to the second switching element, and a controller configured to receive, from the phase detector, phase information including the phase difference, provide the inverter with a switching signal to thereby control the switching operation, and adjust an operating frequency of the switching signal based on the phase information to thereby control an output of the working coil.

An induction heating device includes a working coil, an inverter including a first switching element and a second switching element that are configured to perform a switching operation and to apply a resonance current to the working coil, a snubber capacitor including a first snubber capacitor connected to the first switching element, and a second snubber capacitor connected to the second switching element, a phase detector configured to detect a phase difference between the resonance current applied to the working coil and a switching voltage applied to the second switching element, and a controller configured to receive, from the phase detector, phase information including the phase difference, provide the inverter with a switching signal to thereby control the switching operation, and adjust an operating frequency of the switching signal based on the phase information to thereby control an output of the working coil.