Wireless charging system
A wireless charging system that pertains to the field of wireless charging technologies is provided. The system includes: a transmit apparatus and a receive apparatus where the transmit apparatus includes an inverter circuit and two transmit electrodes, an input terminal of the inverter circuit is connected to a direct-current power supply, and two output terminals of the inverter circuit are connected to the two transmit electrodes respectively and where the receive apparatus includes two receive electrodes and a rectifier circuit, two input terminals of the rectifier circuit are connected to the two receive electrodes respectively, and an output terminal of the rectifier circuit is connected to a load.
1 . A wireless charging system, wherein the system comprises:
a transmit apparatus comprising an inverter circuit and two transmit electrodes, an input terminal of the inverter circuit is connected to a direct-current power supply and two output terminals of the inverter circuit are connected to the two transmit electrodes respectively; and
a receive apparatus comprising two receive electrodes and a rectifier circuit, two input terminals of the rectifier circuit are connected to the two receive electrodes respectively and an output terminal of the rectifier circuit is connected to a load,
wherein one transmit electrode of the two transmit electrodes is coupled to one receive electrode of the two receive electrodes through a first transmission medium, and wherein electric conductivity of the first transmission medium is greater than electric conductivity of air;
wherein the two transmit electrodes are coupled through a power transmission medium and are coupled to a receive coil of the receive apparatus through the power transmission medium;
wherein the receive coil generates an alternating current under an action of a magnetic field and transmits the alternating current to the rectifier circuit which converts the alternating current into a direct current and outputs the direct current to the load to supply power to the load; and
wherein transmission power between the transmit apparatus and the receive apparatus is directly proportional to an operating frequency of the system, equivalent coupling capacitance between the transmit electrode and the receive electrode, output voltage of the transmit apparatus, and input voltage of the receive apparatus.
2 . The system according to claim 1 , wherein:
the other transmit electrode of the two transmit electrodes is coupled to the other receive electrode of the two receive electrodes through the air; or
the other transmit electrode of the two transmit electrodes is coupled to the other receive electrode of the two receive electrodes through a second transmission medium, wherein electric conductivity of the second transmission medium is greater than the electric conductivity of the air.
3 . The system according to claim 1 , wherein the transmit apparatus further comprises:
a first compensation circuit, the first compensation circuit is connected between the inverter circuit and the two transmit electrodes, and the first compensation circuit is configured to compensate for capacitive reactance between the transmit apparatus and the receive apparatus.
4 . The system according to claim 1 , wherein the receive apparatus further comprises:
a second compensation circuit, the second compensation circuit is connected between the two receive electrodes and the rectifier circuit, and the second compensation circuit is configured to compensate for capacitive reactance between the receive apparatus and the transmit apparatus.
5 . The system according to claim 1 , wherein the one transmit electrode comes into contact with the first transmission medium or a distance between the one transmit electrode and the first transmission medium is greater than 0 and less than a first distance.
6 . The system according to claim 1 , wherein the one receive electrode comes into contact with the first transmission medium, or a distance between the one receive electrode and the first transmission medium is greater than 0 and less than a second distance.
7 . The system according to claim 1 , wherein the one transmit electrode is at least a portion of a metal structural part of a wireless charging transmit device in which the transmit apparatus is located or the one transmit electrode is located on an inner side of a housing of the wireless charging transmit device.
8 . The system according to claim 1 , wherein the one receive electrode is at least a portion of a metal structural part of a wireless charging receive device in which the receive apparatus is located or the one receive electrode is located on an inner side of a housing of the wireless charging receive device.
9 . A wireless charging system, comprising:
a transmit apparatus comprising an inverter circuit and two transmit electrodes, an input terminal of the inverter circuit is connected to a direct-current power supply, one output terminal of the inverter circuit is connected to one of the transmit electrodes, and the other output terminal of the inverter circuit is connected to an output terminal of the transmit apparatus; and
a receive apparatus comprising one receive electrode and a rectifier circuit, one input terminal of the rectifier circuit is connected to the receive electrode, the other input terminal of the rectifier circuit is connected to an input terminal of the receive apparatus, and an output terminal of the rectifier circuit is connected to a load,
wherein the transmit electrode is coupled to the receive electrode through a power transmission medium, and wherein electric conductivity of the power transmission medium is greater than electric conductivity of air;
wherein the two transmit electrodes are coupled to a receive coil of the receive apparatus through another power transmission medium;
wherein the receive coil generates an alternating current under an action of a magnetic field and transmits the alternating current to the rectifier circuit which converts the alternating current into a direct current and outputs the direct current to the load to supply power to the load; and
wherein transmission power between the transmit apparatus and the receive apparatus is directly proportional to an operating frequency of the system, equivalent coupling capacitance between the transmit electrode and the receive electrode, output voltage of the transmit apparatus, and input voltage of the receive apparatus.
10 . The system according to claim 9 , wherein the transmit apparatus further comprises:
a first compensation circuit, the first compensation circuit is connected between the inverter circuit and the transmit electrode, and is connected between the inverter circuit and the output terminal of the transmit apparatus, and the first compensation circuit is configured to compensate for capacitive reactance between the transmit apparatus and the receive apparatus.
11 . The system according to claim 9 , wherein the receive apparatus further comprises:
a second compensation circuit, the second compensation circuit is connected between the receive electrode and the rectifier circuit, and is connected between the input terminal of the receive apparatus and the rectifier circuit, and the second compensation circuit is configured to compensate for capacitive reactance between the receive apparatus and the transmit apparatus.
12 . The system according to claim 9 , wherein
the transmit electrode comes into contact with the power transmission medium or a distance between the transmit electrode and the power transmission medium is greater than 0 and less than a first distance.
13 . The system according to claim 9 , wherein the receive electrode comes into contact with the power transmission medium or a distance between the receive electrode and the power transmission medium is greater than 0 and less than a second distance.
14 . The system according to claim 9 , wherein the transmit electrode is at least a portion of a metal structural part of a wireless charging transmit device in which the transmit apparatus is located or the transmit electrode is located on an inner side of a housing of the wireless charging transmit device.
15 . The system according to claim 9 , wherein the receive electrode is at least a portion of a metal structural part of a wireless charging receive device in which the receive apparatus is located or the receive electrode is located on an inner side of a housing of the wireless charging receive device.
16 . A wireless charging system, wherein the system comprises:
a transmit apparatus comprising an inverter circuit and two transmit electrodes, wherein an input terminal of the inverter circuit is connected to a direct-current power supply and two output terminals of the inverter circuit are connected to the two transmit electrodes respectively; and the two transmit electrodes are coupled through a power transmission medium, wherein electric conductivity of the power transmission medium is greater than electric conductivity of air;
a receive apparatus comprising a receive coil and a rectifier circuit, an input terminal of the rectifier circuit is connected to the receive coil, and an output terminal of the rectifier circuit is connected to a load;
wherein the two transmit electrodes are coupled to the receive coil through the power transmission medium;
wherein the receive coil generates an alternating current under an action of a magnetic field and transmits the alternating current to the rectifier circuit which converts the alternating current into a direct current and outputs the direct current to the load to supply power to the load; and
wherein transmission power between the transmit apparatus and the receive apparatus is directly proportional to an operating frequency of the system, equivalent coupling capacitance between the transmit electrode and a receive electrode, output voltage of the transmit apparatus, and input voltage of the receive apparatus.
17 . The system according to claim 16 , wherein the transmit apparatus further comprises:
a first compensation circuit, the first compensation circuit is connected between the inverter circuit and the two transmit electrodes, and is configured to compensate for capacitive reactance between the two transmit electrodes.
18 . The system according to claim 16 , wherein the receive apparatus further comprises:
a second compensation circuit, and the second compensation circuit is connected between the receive coil and the rectifier circuit, and is configured to compensate for inductive reactance of the receive coil.
19 . The system according to claim 16 , wherein: at least one transmit electrode of the two transmit electrodes comes into contact with the power transmission medium;
a distance between at least one transmit electrode of the two transmit electrodes and the power transmission medium is greater than 0 and less than a reference distance; or
one transmit electrode of the two transmit electrodes comes into contact with the power transmission medium and a distance between the other transmit electrode and the power transmission medium is greater than 0 and less than a reference distance.
20 . The system according to claim 16 , wherein:
at least one transmit electrode of the two transmit electrodes is at least a portion of a metal structural part of a wireless charging transmit device in which the transmit apparatus is located;
at least one transmit electrode of the two transmit electrodes is located on an inner side of a housing of the wireless charging transmit device; or
one transmit electrode of the two transmit electrodes is at least a portion of a metal structural part of the wireless charging transmit device and the other transmit electrode is located on an inner side of a housing of the wireless charging transmit device.