| CPC H05B 6/062 (2013.01) [H05B 6/04 (2013.01); H05B 2206/02 (2013.01)] | 15 Claims |
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1. 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 second 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 second capacitor is discharged through the resistor;
after the second capacitor is discharged, the controller is configured to 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, wherein a duty cycle of the second control signal is lower than 50%, such that the first capacitor is discharged through the second capacitor, the coil and the second switch which is turned on.
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