Wireless power transmitter

A wireless power transmitter, comprising:

• a first resonance circuit;
• and
• a step-up/step-down inverter comprising switching elements forming a first bridge circuit, and configured to receive input direct current (DC) voltage and transmit a first power through the first resonance circuit by switching operations of the switching elements,
• wherein the step-up/step-down inverter is configured to step-down the input DC voltage according to a duty ratio of at least one switching element among the switching elements and apply the stepped-down input DC voltage to the first bridge circuit, in response to the input DC voltage being a first voltage, and
• wherein the step-up/step-down inverter comprises,
• an inductor connected between a terminal to which the input DC voltage is applied and a first node,
• a first capacitor connected between the first node and a second node,
• a first switching element, among the switching elements, connected between the second node and a third node,
• a second switching element, among the switching elements, connected between the first node and a ground, and
• a second capacitor connected between the third node and the ground.