Heating device and control method thereof

A heating device configured to generate an induced magnetic field according to a voltage provided by a power source, comprising:

• a first capacitor coupled to the power source;
• a first switch;
• a second switch coupled to first switch in series at a first node, and the first switch and the second switch are coupled with the first capacitor in parallel;
• a second capacitor coupled to the first switch;
• a third capacitor coupled to the second switch, and coupled to the second capacitor in series at a second node;
• a coil coupled between the first node and the second node, and configured to generate the induced magnetic field;
• a resistor coupled with the third capacitor in parallel;
• and
• a controller configured to output a first control signal and a second control signal to the first switch and the second switch, respectively, wherein the first control signal and the second control signal are complementary to each other;
• wherein after the heating device receives the voltage, the third capacitor is discharged through the resistor.

A heating device, configured to generate an induced magnetic field according to a voltage provided by a power source, comprising:

• a first capacitor coupled to the power source;
• a first switch;
• a second switch coupled to the first switch in series at a first node, and the first switch and the second switch are coupled with the first capacitor in parallel;
• a second capacitor coupled to the first switch;
• a third capacitor coupled to the second switch, and coupled to the second capacitor in series at a second node;
• a coil coupled between the first node and the second node, and configured to generate the induced magnetic field;
• a resistor and a third switch coupled to the resistor in series, wherein the third switch and the resistor are coupled with the third capacitor in parallel;
• a controller configured to output a first control signal and a second control signal to the first switch and the second switch, respectively, wherein the first control signal and the second control signal are complementary to each other;
• wherein after the heating device receives the voltage, the controller is configured to control the third switch to be turned on to make the third capacitor be discharged through the resistor;
• and
• after the third capacitor is discharged, the controller is configured to control the third switch to be turned off, and output the first control signal to turn on or off the first switch and the second control signal to turn on or off the second switch.