Induction heating device having improved control algorithm and circuit structure

An induction heating device comprising:

• a first board that comprises:
• a first working coil,
• a first resonant capacitor connected to the first working coil,
• a first inverter configured to perform a first switching operation and to apply a first resonant current to the first working coil based on the first switching operation,
• a first current transformer configured to adjust a magnitude of the first resonant current output from the first inverter and to transmit the first resonant current having the adjusted magnitude to the first working coil,
• a first control unit configured to control operation of the first inverter;
• and
• a second board that comprises:
• a second working coil,
• a second resonant capacitor connected to the second working coil,
• a second inverter configured to perform a second switching operation and to apply a second resonant current to the second working coil based on the second switching operation,
• a second current transformer configured to adjust a magnitude of the second resonant current output from the second inverter and to transmit the second resonant current having the adjusted magnitude to the second working coil,
• a first relay configured to selectively connect a first end of the second working coil to the second current transformer or to a first end of the first working coil,
• a second relay configured to selectively connect a second end of the second working coil to a second end of the first working coil or to the second resonant capacitor, and
• a second control unit configured to control operation of each of the second inverter, the first relay, and the second relay.