WIRELESS POWER TRANSMITTER SUPPORTING MULTIPLE MODES
The present invention relates to a wireless power transmission technology and, more particularly, to a wireless power transmitter capable of increasing the probability that wireless power transmission will succeed, thereby improving performance. A wireless power transmitter according to an embodiment of the present invention comprises: a first coil printed circuit board (PCB) comprising an induction coil for transmitting a power signal in a first frequency band to a wireless power receiver coil having a first coupling coefficient; a second coil PCB formed on the upper or lower portion of the first coil PCB, the second coil PCB comprising a resonance coil for transmitting a power signal in a second frequency band to a wireless power receiver coil having a second coupling coefficient; and a control circuit PCB formed beneath the first and second coil PCBs so as to control the induction coil and the resonance coil, wherein the induction coil has a charging area on the upper portion of the first coil PCB, the resonance coil has a charging area on the upper portion of the second coil PCB, and the charging area of the induction coil may at least partially overlap with the charging area of the resonance coil.
1 . A wireless power transmitter supporting multiple modes, comprising:
a first coil PCB (printed circuit board) comprising an induction coil for transmitting a power signal of a first frequency band to a wireless power receiver coil having a first coupling coefficient;
a second coil PCB formed over or under the first coil PCB, the second coil PCB comprising a resonant coil for transmitting a power signal of a second frequency band to a wireless power receiver coil having a second coupling coefficient; and
a control circuit PCB formed under the first coil PCB and the second coil PCB and configured to control the induction coil and the resonant coil,
wherein a charging area of the induction coil is over the first coil PCB, and a charging area of the resonant coil is over the second coil PCB,
wherein the charging area of the induction coil at least partially overlaps the charging area of the resonant coil.
2 . The wireless power transmitter according to claim 1 , further comprising:
a first connector configured to electrically connect the first coil PCB and the control circuit PCB.
3 . The wireless power transmitter according to claim 2 , wherein the second coil PCB comprises a connector hole allowing the first connector to pass therethrough.
4 . The wireless power transmitter according to claim 1 , further comprising:
a second connector configured to electrically connect the second coil PCB and the control circuit PCB.
5 . The wireless power transmitter according to claim 1 , wherein the induction coil comprises three transmission induction coils positioned to at least partially overlap each other.
6 . The wireless power transmitter according to claim 1 , further comprising:
ferrite for shielding a magnetic field, the ferrite being positioned between the second coil PCB and the control circuit PCB.
7 . The wireless power transmitter according to claim 1 , wherein the first coupling coefficient is greater than the second coupling coefficient,
wherein a range of the first frequency band is below a range of the second frequency band.
8 . The wireless power transmitter according to claim 1 , wherein a range of the first coupling coefficient is from 0 to 0.2 and a range of the first frequency band is from 90 kHz to 300 kHz or from 100 kHz to 220 kHz.
9 . The wireless power transmitter according to claim 1 , wherein a range of the second coupling coefficient is from 0.5 to 1.0 and a range of the second frequency band is from 6 MHz to 8 MHz.
10 . A wireless power transmitter supporting multiple modes, comprising:
a first coil PCB (printed circuit board) comprising an induction coil for transmitting a power signal of a first frequency band to a wireless power receiver coil having a first coupling coefficient;
a second coil PCB formed over or under the first coil PCB, the second coil PCB comprising a resonant coil for transmitting a power signal of a second frequency band to a wireless power receiver coil having a second coupling coefficient;
a control circuit PCB formed under the first coil PCB and the second coil PCB and configured to control the induction coil and the resonant coil; and
a first connector configured to electrically connect the first coil PCB and the control circuit PCB,
wherein a charging area of the induction coil is over the first coil PCB, and a charging area of the resonant coil is over the second coil PCB,
wherein the charging area of the induction coil at least partially overlaps the charging area of the resonant coil.
11 . The wireless power transmitter according to claim 10 , further comprising:
a second connector configured to electrically connect the second coil PCB and the control circuit PCB.
12 . The wireless power transmitter according to claim 11 , wherein the first connector and the second connector are positioned on opposite sides.
13 . The wireless power transmitter according to claim 10 , wherein the second coil PCB comprises a connector hole allowing the first connector to pass therethrough.
14 . The wireless power transmitter according to claim 10 , wherein the first coupling coefficient is greater than the second coupling coefficient,
wherein a range of the first frequency band is below a range of the second frequency band.
15 . The wireless power transmitter according to claim 10 , wherein a range of the first coupling coefficient is from 0 to 0.2 and a range of the first frequency band is from 90 kHz to 300 kHz or from 100 kHz to 220 kHz.
16 . The wireless power transmitter according to claim 10 , wherein a range of the second coupling coefficient is from 0.5 to 1.0 and a range of the second frequency band is from 6 MHz to 8 MHz.