Wireless power transmitter and receiver for vehicle
According to an embodiment of present invention, a wireless power transmitter for a vehicle that transfers power to a wireless power comprising: a resonance circuit comprising a coil assembly and/or a capacitor, wherein the coil assembly comprises first and second bottom coils placed adjacent to each other in a line and each consisting of a single layer of 11 turns and a top coil stacked on the first and second bottom coils and consisting of a single layer of 12 turns; a frequency full bridge driver driving each of coils included in the coil assembly individually, and a placement detection unit detecting a placement of the wireless power receiver.
1. A wireless power transmitter that transfers power to a wireless power receiver, comprising:
a resonance circuit comprising a coil assembly and a capacitor,
wherein the coil assembly comprises first and second bottom coils placed adjacent to each other in a line and each consisting of a single layer of 11 turns and a top coil stacked on the first and second bottom coils and consisting of a single layer of 12 turns;
a frequency full bridge driver driving each coil included in the coil assembly individually, and
a placement detection unit detecting a placement of the wireless power receiver,
wherein the first and second bottom coils and the top coil have a substantially rectangular frame structure with a through hole in the center,
wherein the top coil lies on a plane surface in the middle between the first and second bottom coils,
wherein an area of the top coil is 49.5±1.0 mm ×46.0±1.0 mm, and an area of the through hole in the top coil is 21.0±1.0 mm ×25.5±1.0 mm,
wherein an area of the first and second bottom coils is 49.0±1.0 mm ×44.0±1.0 mm and an area of the through hole in the first and second bottom coils is 26.0±1.0 mm ×22.0±1.0 mm,
wherein the first and second bottom coils and the top coil have a same inductance value,
wherein the first and second bottom coils and the top coil have the same inductance value within a range of 10.6 μH to 12.0 μH,
wherein the capacitor has a capacitance value of 126.5 nF to 139.5 nF, and
wherein an operating frequency of the resonance circuit is adjusted within a range of 140 kHz to 150 kHz.
2. The wireless power transmitter of claim 1 , wherein a level of power transferred to the wireless power receiver is controlled based on a level of input voltage, and input current applied to the frequency full bridge driver.
3. The wireless power transmitter of claim 2 , wherein the level of input voltage applied to the frequency full bridge driver is adjusted within a range of 2.5 V to 15 V.
4. The wireless power transmitter of claim 2 , wherein the level of input current applied to the frequency full bridge driver is adjusted within a range of 1 A to 1.5 A.
5. The wireless power transmitter of claim 1 , wherein an operating frequency of the placement detection unit is 130±5 kHz, and a duty cycle of the placement detection unit is 50±5%.
6. The wireless power transmitter of claim 5 , wherein, when the placement detection unit transmits a digital ping signal to wake up the wireless power receiver, a maximum frequency of the digital ping is 145±5 kHz.