Induction heating and wireless power transmitting apparatus having control algorithm

An apparatus for induction heating and wireless power transmission, the apparatus comprising:

• a first group of working coils comprising a first working coil and a second working coil that are electrically connected to each other in parallel;
• a first inverter configured to perform a switching operation to generate a resonance current in at least one of the first working coil or the second working coil;
• a first semiconductor switch electrically connected to the first working coil and configured to turn on and turn off the first working coil;
• a second semiconductor switch electrically connected to the second working coil and configured to turn on and turn off the second working coil;
• a first resonance capacitor electrically connected between the first working coil and the first semiconductor switch;
• a second resonance capacitor electrically connected between the second working coil and the second semiconductor switch;
• and
• a controller configured to:
• turn on the first semiconductor switch at a first time point P1,
• provide the first inverter with N pulses from a starting time point P1′ to an end time point P1″, wherein a first delay is provided between the first time point P1 and the start time point P1′,
• detect an attenuation degree of the resonance current generated in the first working coil,
• detect whether an object is disposed above the first working coil based on the attenuation degree of the resonance current,
• turn off the first semiconductor switch at a second time point P2, wherein a second delay is provided between the end time point P1″ and the second time point P2, and
• turn on the second semiconductor switch at the second time point P2 at which the first semiconductor switch is turned off.