Apparatus for transmitting power wirelessly
There are provided an apparatus for transmitting power wirelessly. The apparatus for transmitting power wirelessly may include a boosting unit boosting an input voltage, and an inverter unit inverting the boosted voltage output from the boosting unit to transmit power wirelessly. The inverter unit and the boosting unit are controlled by the same switching element.
1. An apparatus for transmitting power wirelessly, the apparatus comprising:
a converting unit comprising a first switch and a second switch, and configured to output one of a first AC voltage generated by boosting an input voltage by an alternating switching operation of the first switch and the second switch and a second AC voltage generated by using the input voltage;
a resonance circuit configured to input the first AC voltage or the second AC voltage, and transmit a power wirelessly; and
a bypass unit configured to change an input node to which the input voltage is applied according to a magnitude of the input voltage,
wherein the converting unit further comprises a first inductor and a first capacitor,
wherein the bypass unit comprises,
a third switch connected between an input terminal to which the input voltage is applied and the first inductor, and
a diode comprising an anode connected to the input terminal and a cathode connected to the first capacitor.
2. The apparatus of claim 1 , wherein the converting unit in configured to vary a switching frequency of the first switch and the second switch to compensate a difference between the first AC voltage and the second AC voltage.
3. The apparatus of claim 1 , wherein the first inductor is connected between a first node and a second node, the first capacitor is connected between a third node and a fourth node, the first switch is connected between the third node and the second node, the second switch is connected between the second node and the fourth node.
4. The apparatus of claim 3 , wherein the third switch is configured to turn on when the magnitude of the input voltage is a first value, and configured to turn off when the magnitude of the input voltage is a second value larger than the first value.
5. The apparatus of claim 4 , the converting unit is configured to output the first AC voltage through the second node and the fourth node when the third switch is turned on.
6. The apparatus of claim 4 , the converting unit is configured to output the second AC voltage through the second node and the fourth node when the third switch is turned off.
7. The apparatus of claim 3 , the resonance circuit comprises a second inductor and a second capacitor connected in series between the second node and the fourth node.