Dc-dc converter and method for driving same

A DC-DC converter, comprising:

• a first signal generating unit generating a first pulse width modulation (PWM) signal, the first PWM signal being a square signal;
• a signal processing unit comprising a second signal generating unit, a first logic unit and a second logic unit, the second signal generating unit generating a second PWM signal, the second PWM signal being a square signal and a frequency of the second PWM signal being different from a frequency of the first PWM signal, the first logic unit performing an AND operation to the first PWM signal and the second PWM signal to obtain a first control signal, the second logic unit generating a second control signal by inverting the first control signal;
• and
• a voltage converting unit comprises a source supply, a first switch, a second switch, a first energy storing unit, a second energy unit, a first voltage output terminal and a second voltage output terminal, the source supply generating a first direct current (DC) voltage, the first switch switching on or switching off under control of the first control signal, the second switch alternately switching on with the first switch;
• when the first switch switching on and the second switch switching off, the first energy storing unit storing energy by charging of the first DC voltage, and discharging to the second energy storing unit when the first switch switching off and the second switch switching on;
• the second energy storing unit receiving energy discharged by the first energy storing unit and converting the first DC voltage into a second DC voltage.

A method for driving a DC-DC converter, comprising:

• providing a first PWM signal and a second PWM signal, the first PWM signal and the second PWM signal being square signals, a frequency of the first PWM signal being different from a frequency of the second PWM signal;
• performing an AND operation to the first PWM signal and the second PWM signal so as to obtain a first control signal;
• inverting the first control signal to obtain a second control signal;
• and
• providing the first control signal and the second control signal to a voltage converting unit, the voltage converting unit converting a first DC voltage to a second DC voltage under control of the first control signal and the second control signal.