Switching controlling circuit, converter using the same, and switching controlling method

A switching control circuit controlling a switching operation of a switching device which controls a generation of an output voltage from DC input power by an energy storage device and turning on the switching device when a voltage between one terminal and the other terminal of the switching device reaches a lowest point of a resonance waveform, the switching control circuit comprising:

• a voltage detection unit detecting the voltage between one terminal and the other terminal at the time of the resonance waveform;
• a first signal output unit outputting a first signal when the voltage detected by the voltage detection unit reaches a change point of a slope corresponding to the lowest point of the resonance waveform;
• and
• a switching driving unit turning on the switching device in response to the first signal.

A switching controlling method controlling a switching operation of a switching device controlling a generation of an output voltage from DC input power by an energy storage device and turning on the switching device when a voltage between one terminal and the other terminal of the switching device reaches a lowest point of a resonance waveform, the switching controlling method comprising:

• detecting the voltage between one terminal and the other terminal at the time of the resonance waveform;
• outputting a first signal when a detected voltage between one terminal and the other terminal reaches a change point of a slope corresponding to the lowest point of the resonance waveform;
• and
• turning on the switching device in response to the first signal.