Inductive resonant wireless charging system, resonant wireless charging transmitting device, wireless charging relay device and inductive wireless charging receiving device

1. An inductive resonant wireless charging system, comprising: a resonant wireless charging transmitting device for transmitting a high-frequency radio frequency wave; a wireless charging relay device including a resonant receiving coil, a first variable capacitor and an inductive transmitting coil, wherein the resonant receiving coil receives the high-frequency radio frequency wave in a manner of electromagnetic resonance, and the inductive transmitting coil transmits a low-frequency radio frequency wave; and an inductive wireless charging receiving device for receiving the low-frequency radio frequency wave in a manner of electromagnetic induction;

wherein the inductive wireless charging receiving device includes an inductive receiving coil, a second variable capacitor and an inductive resonant switch, in which, when the inductive resonant switch is turned on, the inductive receiving coil and the second variable capacitor form a parallel structure, and the inductive receiving coil receives the high-frequency radio frequency wave in the manner of electromagnetic resonance, and when the inductive resonant switch is turned off, the inductive receiving coil receives the low-frequency radio frequency wave in the manner of electromagnetic induction.

2. The inductive resonant wireless charging system of claim 1 , wherein the wireless charging relay device further includes a control module, in which the control module adjusts the first variable capacitor to enable the resonant receiving coil to reach a resonant frequency of the high-frequency radio frequency wave, and converts the high-frequency radio frequency wave into a low-frequency radio frequency wave.

3. The inductive resonant wireless charging system of claim 1 , wherein the wireless charging relay device generates an equivalent circuit through the manner of electromagnetic induction performed with the inductive wireless charging receiving device, so that the wireless charging relay device forms an impedance matching circuit corresponding to a maximum power output of the manner of electromagnetic induction.

4. The inductive resonant wireless charging system of claim 1 , wherein the inductive wireless charging receiving device is an electronic device, and the wireless charging relay device is a protective housing of the electronic device or a conductive sticker attached to the electronic device of the protective housing of the electronic device.

5. The inductive resonant wireless charging system of claim 1 , wherein the inductive wireless charging receiving device has a receiving power of 4 to 6 watts.

6. The inductive resonant wireless charging system of claim 1 , wherein a resonant frequency of the high-frequency radio frequency wave is between 3 and 30 MHz, and a resonant frequency of the low-frequency radio frequency wave is between 30 and 300 kHz.

7. The inductive resonant wireless charging system of claim 1 , wherein the resonant wireless charging transmitting device includes a power amplifier circuit, in which a switch of the power amplifier circuit is a gallium nitride (GaN) transistor.

8. The inductive resonant wireless charging system of claim 1 , wherein the manner of electromagnetic resonance adopts A4WP (Alliance for Wireless Power) standard, and the manner of electromagnetic induction adopts WPC Qi (Wireless Power Consortium Qi) standard.

9. The inductive resonant wireless charging system of claim 1 , wherein the high-frequency radio frequency wave is a beam-forming electric wave.

10. A resonant wireless charging transmitting device used in an inductive resonant wireless charging system having a wireless charging relay device and an inductive wireless charging receiving device, wherein the resonant wireless charging transmitting device transmits a high-frequency radio frequency wave, the wireless charging relay device includes a resonant receiving coil, a first variable capacitor and an inductive transmitting coil, in which the resonant receiving coil receives the high-frequency radio frequency wave in a manner of electromagnetic resonance, and the inductive transmitting coil transmits a low-frequency radio frequency wave, and the inductive wireless charging receiving device receives the low-frequency radio frequency wave in a manner of electromagnetic induction;

wherein the inductive wireless charging receiving device includes an inductive receiving coil, a second variable capacitor and an inductive resonant switch, in which, when the inductive resonant switch is turned on, the inductive receiving coil and the second variable capacitor form a parallel structure, and the inductive receiving coil receives the high-frequency radio frequency wave in the manner of electromagnetic resonance, and when the inductive resonant switch is turned off, the inductive receiving coil receives the low-frequency radio frequency wave in the manner of electromagnetic induction.

11. A wireless charging relay device used in an inductive resonant wireless charging system having a resonant wireless charging transmitting device and an inductive wireless charging receiving device, wherein the resonant wireless charging transmitting device transmits a high-frequency radio frequency wave, the wireless charging relay device includes a resonant receiving coil, a first variable capacitor and an inductive transmitting coil, in which the resonant receiving coil receives the high-frequency radio frequency wave in a manner of electromagnetic resonance, and the inductive transmitting coil transmits a low-frequency radio frequency wave, and the inductive wireless charging receiving device receives the low-frequency radio frequency wave in a manner of electromagnetic induction;

wherein the inductive wireless charging receiving device includes an inductive receiving coil, a second variable capacitor and an inductive resonant switch, in which, when the inductive resonant switch is turned on, the inductive receiving coil and the second variable capacitor form a parallel structure, and the inductive receiving coil receives the high-frequency radio frequency wave in the manner of electromagnetic resonance, and when the inductive resonant switch is turned off, the inductive receiving coil receives the low-frequency radio frequency wave in the manner of electromagnetic induction.

12. An inductive wireless charging receiving device used in an inductive resonant wireless charging system having a resonant wireless charging transmitting device and a wireless charging relay device, wherein the resonant wireless charging transmitting device transmits a high-frequency radio frequency wave, the wireless charging relay device includes a resonant receiving coil, a first variable capacitor and an inductive transmitting coil, in which the resonant receiving coil receives the high-frequency radio frequency wave in a manner of electromagnetic resonance, and the inductive transmitting coil transmits a low-frequency radio frequency wave, and the inductive wireless charging receiving device receives the low-frequency radio frequency wave in a manner of electromagnetic induction;

wherein the inductive wireless charging receiving device includes an inductive receiving coil, a second variable capacitor and an inductive resonant switch, in which, when the inductive resonant switch is turned on, the inductive receiving coil and the second variable capacitor form a parallel structure, and the inductive receiving coil receives the high-frequency radio frequency wave in the manner of electromagnetic resonance, and when the inductive resonant switch is turned off, the inductive receiving coil receives the low-frequency radio frequency wave in the manner of electromagnetic induction.