DC-DC converter and method for controlling the same

A control method of a DC-DC converter including a first capacitor;

• a first switching element, a second switching element, a third switching element, and a fourth switching element sequentially connected to one another in series between both ends of the first capacitor;
• and a second capacitor having both ends connected at a connection node of the first switching element and the second switching element and a connection node of the third switching element and the fourth switching element, respectively, the control method comprising:
• controlling states of the second switching element and the third switching element to be complementary;
• sensing a voltage applied to the second capacitor;
• comparing a sensed voltage obtained by sensing the voltage applied to the second capacitor with a preset reference value for overvoltage determination;
• and
• determining that an overvoltage is applied to the both ends of the second switching element or third switching element when the sensed voltage is greater than the preset reference value.

A control method of a DC-DC converter including a first capacitor;

• a first switching element, a second switching element, a third switching element, and a fourth switching element sequentially connected to one another in series between both ends of the first capacitor;
• and a second capacitor having both ends connected at a connection node of the first switching element and the second switching element and a connection node of the third switching element and the fourth switching element, respectively, the control method comprising:
• controlling states of the first switching element and the fourth switching element to be complementary;
• sensing a voltage applied to the first capacitor and a voltage applied to the second capacitor;
• comparing a difference value with a predetermined reference value for overvoltage determination, wherein the difference value is obtained by subtracting a second sensed voltage obtained by sensing the voltage applied to the second capacitor from a first sensed voltage obtained by sensing the voltage applied to the first capacitor;
• and
• determining that an overvoltage is applied to the both ends of the first switching element or fourth switching element when the difference value is greater than the preset reference value.