Wireless power transmitter

A wireless power transmitter, comprising:

• a first power transmitting unit comprising first switching elements forming a first bridge circuit, and configured to receive input direct current (DC) voltage and transmit a first power by switching operations of the first switching elements;
• and
• a second power transmitting unit comprising second switching elements forming a second bridge circuit, and configured to receive the input DC voltage and transmit a second power by switching operations of the second switching elements,
• wherein the first power transmitting unit is configured to step-up the input DC voltage according to a duty ratio of at least one first switching element among the first switching elements, and apply the stepped-up input DC voltage to the first bridge circuit, and
• wherein the second power transmitting unit is configured to step-up or step-down the input DC voltage according to a duty ratio of at least one second switching element among the second switching elements, and apply the stepped-up or stepped-down input DC voltage to the second bridge circuit.