WO2018113489A1

WO2018113489A1 - Non-contact charging system and method

Info

Publication number: WO2018113489A1
Application number: PCT/CN2017/113463
Authority: WO
Inventors: 鲍渊智
Original assignee: 上海掌门科技有限公司
Priority date: 2016-12-20
Filing date: 2017-11-29
Publication date: 2018-06-28

Abstract

A non-contact charging system of the present invention comprises a positioning magnetic field generation device used for generating a positioning magnetic field, a positioning magnetic field detection device corresponding to the positioning magnetic field generation device, and a wireless charging unit, the wireless charging unit starting wireless charging according to the detection result of the positioning magnetic field detection device. Compared with the prior art, the present invention can accurately determine whether two parties of the charging system are in optimal coupling locations, avoiding starting a wireless charging function when the two parties are in wrong placement locations, and can avoid occurrence of an unfavorable problem, greatly improving wireless charging efficiency.

Description

Non-contact charging system and method

Technical field

The present invention relates to the field of charging, and in particular to a contactless charging system and method.

Background technique

Portable electronic products are easy to carry and easy to use. Many portable electronic devices such as mobile phones, PDAs, MP3 players, and smart watches use rechargeable batteries. Once the battery is exhausted, it needs to be charged in time. At present, the commonly used chargers are connected to the load through conductors, and the charger interfaces produced by various manufacturers are different, so there may be charging safety problems, such as poor contact of the connectors during plugging, especially in the case of After long-term use, there may be phenomena such as poor contact or other faults. Secondly, the charging interfaces of different devices are different and cannot be universal. If the user needs to charge multiple devices at the same time, multiple chargers must be connected, which causes inconvenience in use. Thus, an inductive non-contact charging device has emerged which utilizes a charging terminal to generate an induced magnetic field for non-contact charging of the rechargeable battery.

However, when the non-contact charging device is in use, if the user shifts the position when the non-contact charging transmitting device and the receiving device are placed, the charging efficiency is greatly reduced, and the heat generation is increased, if the circuit is not made in time. A corresponding problem can easily lead to a series of problems such as overheating of the device. At present, the industry's solutions usually fix the placement positions of the charging transmitting device and the receiving device by mechanical means, which is easily subject to human damage. Moreover, the design of the mechanical structure design requires high mechanical design and has a life limit. Therefore, there is a need for a safe, simple, flexible, and efficient non-contact charging system and method.

Summary of the invention

The object of the present invention is achieved by the following technical solutions.

According to an embodiment of the present invention, a contactless charging system is provided, the system including a positioning magnetic field generating device for generating a positioning magnetic field, a positioning magnetic field detecting device corresponding to the positioning magnetic field generating device, and a wireless charging unit, The positioning magnetic field generating device is disposed opposite to the positioning magnetic field detecting device, and the positioning magnetic field detecting device detects the positioning magnetic field generated by the positioning magnetic field generating device, The wireless charging unit turns on wireless charging according to the detection result of the positioning magnetic field detecting device.

According to an embodiment of the invention, the positioning magnetic field generating device is disposed at a charging transmitting end, and the positioning magnetic field detecting device is disposed at a charging receiving end.

According to an embodiment of the present invention, the charging receiving end further includes a signal feedback circuit and a second processor, wherein the signal feedback circuit and the positioning magnetic field detecting device are respectively connected to the second processor, and when the second processor detects the positioning When the magnetic field detecting device has a current or voltage signal, the signal feedback circuit is instructed to send a coupled positioning signal to the charging transmitting end.

According to an embodiment of the present invention, the charging transmitting end further includes a positioning signal receiving circuit and a first processor, wherein the positioning signal receiving circuit and the positioning magnetic field generating device are respectively connected to the first processor, and the positioning signal receiving circuit is used for Receiving a coupling positioning signal sent by the charging receiving end; the first processor is configured to generate a charging instruction according to the received coupled positioning signal; and the wireless charging unit performs charging of the wireless charging unit according to the charging instruction.

According to an embodiment of the invention, the positioning magnetic field generating device is disposed at a charging receiving end, and the positioning magnetic field detecting device is disposed at a charging transmitting end.

According to an embodiment of the invention, the positioning magnetic field detecting device is a Hall sensor.

According to an embodiment of the invention, the positioning magnetic field generating device is a magnet.

According to an embodiment of the present invention, the positioning magnetic field detecting device and the positioning magnetic field generating device are each one.

According to an embodiment of the invention, the charging transmitting end further comprises a rechargeable battery for supplying power to the charging transmitting end without a DC power supply.

According to an embodiment of the present invention, the first processor is further configured to perform an abnormal prompt when a coupled positioning signal is not received within a predetermined time after the charging receiving end is placed on the charging transmitting end; or start normal charging When the coupled positioning signal is not received again within the predetermined time period, it is determined that the charging receiving end is moved, an abnormality prompt is issued, or an instruction to reduce the charging current is issued.

According to an embodiment of the present invention, a non-contact charging method is also proposed, which may be implemented by the above-described non-contact charging system, the method comprising:

Detecting whether the charging receiving end is placed on the charging transmitting end;

If yes, continue to detect the positioning magnetic field;

When the positioning magnetic field is detected, the charging transmitting end charges the charging receiving end;

When the positioning magnetic field is not detected, the abnormal protection process is performed.

According to an embodiment of the present invention, the detecting positioning magnetic field detects a magnetic field generated by a positioning magnetic field generating device disposed on a charging transmitting end by a positioning magnetic field detecting device disposed on the charging receiving end; and detecting a current generated by the positioning magnetic field detecting device Or a voltage signal, the coupled positioning signal is sent to the charging transmitter.

According to an embodiment of the present invention, the detecting positioning magnetic field detects a magnetic field generated by a positioning magnetic field generating device disposed on the charging receiving end by a positioning magnetic field detecting device disposed on the charging transmitting end; and detecting a current generated by the positioning magnetic field detecting device Or a voltage signal, the coupled positioning signal is sent to the charging receiving end.

According to an embodiment of the present invention, the abnormality protection process includes performing an abnormality prompt when a coupled positioning signal is not received within a predetermined time after the charging receiving end is placed on the charging transmitting end; or when the normal charging is started During the time when the coupled positioning signal is not received again, it is determined that the charging receiving end is moved, an abnormality prompt is issued, or an instruction to reduce the charging current is issued.

The advantages of the invention are:

The non-contact charging system of the present invention includes a positioning magnetic field generating device for generating a positioning magnetic field, a positioning magnetic field detecting device corresponding to the positioning magnetic field generating device, and a wireless charging unit, the wireless charging unit detecting the detection result according to the positioning magnetic field detecting device Turn on wireless charging; compared with the prior art, it can accurately determine whether both sides of the charging system are in the optimal coupling position, avoiding the wireless charging function being turned on in the incorrect positioning position, can avoid the occurrence of unfavorable problems, and greatly improve the wireless The efficiency of charging.

DRAWINGS

Various other advantages and benefits will become apparent to those skilled in the art from a The drawings are only for the purpose of illustrating the preferred embodiments and are not to be construed as limiting. Throughout the drawings, the same reference numerals are used to refer to the same parts. In the drawing:

1 is a schematic structural view of a contactless charging system according to an embodiment of the present invention;

2 is a schematic structural view of a charging transmitting end according to a first embodiment of the present invention;

3 is a schematic structural view of a charging receiving end according to a first embodiment of the present invention;

4 is a schematic structural view of a charging transmitting end according to a third embodiment of the present invention;

Figure 5 is a block diagram showing the structure of a charging receiving end according to a third embodiment of the present invention;

6 shows a flow chart of a contactless charging method in accordance with an embodiment of the present invention.

detailed description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While the exemplary embodiments of the present disclosure are shown in the drawings, it is understood that the invention may be embodied in various forms and not limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be more fully understood, and the scope of the disclosure can be fully conveyed to those skilled in the art.

In order to solve the above problems, the present invention provides a contactless charging system, as shown in FIG. 1, the system includes a charging transmitting end (not shown), a charging receiving end (not shown), for generating a positioning magnetic field. a positioning magnetic field generating device, a positioning magnetic field detecting device corresponding to the positioning magnetic field generating device, and a wireless charging unit, wherein the positioning magnetic field generating device is disposed opposite to the positioning magnetic field detecting device, and the positioning magnetic field detecting device detects the positioning magnetic field generating device The generated positioning magnetic field, the wireless charging unit turns on wireless charging according to the detection result of the positioning magnetic field detecting device.

Specifically, when the positioning magnetic field generating device generates a positioning magnetic field, the positioning magnetic field detecting device detects the positioning magnetic field, and when the positioning magnetic field is detected, it indicates that the transmitting end and the receiving end of the non-contact charging system have been placed correctly. The position, that is, the position of the receiving end is at the optimal coupling position of the charging coil of the transmitting end, and the wireless charging is turned on.

The specific implementation of the non-contact charging system of the present invention will be described in detail below with reference to the accompanying drawings.

According to a first embodiment of the present invention, the non-contact charging system includes a charging transmitting end and a charging receiving end; as shown in FIG. 2, the charging transmitting end of the present invention includes a positioning magnetic field generator (ie, a positioning magnetic field generating device) ), positioning signal receiving circuit, DC power supply, DC/DC converter, conversion circuit, switch, transmitting antenna (the DC power supply, DC/DC converter, conversion circuit, switch, transmission antenna, ie, wireless system of contactless charging system) a charging unit) and a first processor;

The positioning magnetic field generator is configured to generate a magnetic field that locates an optimal charging coupling position of the charging transmitting end and the charging receiving end;

The positioning signal receiving circuit is configured to receive a coupled positioning signal sent by the charging receiving end;

The first processor is configured to generate a charging instruction according to the received coupled positioning signal;

The DC/DC converter is configured to generate DC power having a variable voltage according to DC power obtained from a DC power source, and output the signal to a conversion circuit;

The conversion circuit is configured to generate high frequency power having a variable frequency and a variable size, and transmit to the transmitting antenna via a switch;

The switch is configured to transmit the generated high frequency power to the transmitting antenna;

The transmitting antenna is provided with a resonant circuit including a transmitting coil, and is electromagnetically coupled to a receiving antenna of the charging receiving end for charging the charging receiving end.

In this embodiment, preferably, the positioning magnetic field generator is a magnet.

In this embodiment, preferably, the magnet is disposed at a position where an upper surface of the charging transmitting end intersects with an axis of the transmitting coil.

In this embodiment, preferably, the charging transmitting end further includes a rechargeable battery, a battery controller, and a mode converter;

The rechargeable battery is used to supply power to the charging transmitter without a DC power source;

The battery controller is configured to control the charging battery to not operate when the DC power source is provided with power, and control the charging battery to supply power to the charging transmitting end when there is no DC power source;

The mode converter is used to control whether the DC power source charges the rechargeable battery or is used to supply power to the charging transmitter; when the DC power source charges the rechargeable battery, the mode converter controls to disconnect the DC power supply from the DC/DC converter; When the charging transmitting end performs non-contact charging for the charging receiving end through the DC power source, the mode converter controls to disconnect the DC/DC converter from the rechargeable battery.

By providing the above-described rechargeable battery, battery controller, and mode converter, the range of use and portable mobility of the charging transmitting end can be greatly expanded.

In this embodiment, the first processor is further configured to perform an abnormal prompt when the coupled positioning signal is not received within a predetermined time after the charging receiving end is placed on the charging transmitting end; or after starting normal charging When the coupled positioning signal is not received again within the predetermined time, it is determined that the charging receiving end is moved, an abnormality prompt is issued, or an instruction to reduce the charging current is issued.

As shown in FIG. 3, the charging receiving end of the present invention includes a positioning magnetic field detector (ie, a positioning magnetic field detecting device), a signal feedback circuit, a second processor, and a receiving antenna;

The positioning magnetic field detector is configured to detect a magnetic field generated by a positioning magnetic field generator on the charging transmitting end to locate an optimal charging coupling position of the charging transmitting end and the charging receiving end; preferably, the positioning The magnetic field detector periodically detects the magnetic field generated by the positioning magnetic field generator;

The second processor reads a current or voltage signal of the positioning magnetic field detector, and when the current or voltage signal is read, the indication signal feedback circuit sends a coupling positioning signal to the charging transmitting end;

The receiving antenna is provided with a resonant circuit including a receiving coil, and is electrically coupled to a transmitting antenna of the charging transmitting end for charging.

In this embodiment, preferably, the positioning magnetic field detector is a Hall sensor.

In this embodiment, preferably, the Hall sensor is disposed at a position where a lower surface of the charging receiving end intersects with an axis of the receiving coil.

The working principle of this embodiment is: when the positioning magnetic field detector of the charging receiving end detects the magnetic field generated by the positioning magnetic field generator on the charging transmitting end, the two coils of the transmitting antenna and the receiving antenna are also exactly coincident or substantially coincident with each other. Position, at this time, the coupling strength of the two coils is the highest, and the charging efficiency is also the highest, indicating that the charging receiving end has been placed at the optimal charging position.

It can be understood by those skilled in the art that the positioning magnetic field generator and the positioning magnetic field detector can also be disposed at other positions, as long as the pre-measurement is made, when the position of the positioning magnetic field generator and the positioning magnetic field detector coincide, the transmitting antenna and the receiving The technical problems of the present application can be solved by the two coils of the antenna also being in the position where the axes coincide or substantially coincide.

According to a second embodiment of the present invention, the charging transmitting end includes a plurality of positioning magnetic field generators. Correspondingly, the charging receiving end also includes a plurality of positioning magnetic field detectors, the plurality of positioning magnetic field generators and the plurality of positioning magnetic field detectors. One-to-one correspondence, the plurality of positioning magnetic field generators and the plurality of positioning magnetic field detectors may be respectively disposed at any positions of the charging transmitting end and the charging receiving end, when the plurality of positioning magnetic field generators and the plurality of positioning magnetic field detectors are When the positioning is successful, the two coils of the transmitting antenna and the receiving antenna are also in the position where the axes coincide or substantially coincide. This embodiment has a higher positioning accuracy than in the case of a positioning magnetic field generator and a positioning magnetic field detector. The remaining components of the charging transmitting end and the charging receiving end in this embodiment are the same as those in the first embodiment, and will not be described in detail herein.

According to a third embodiment of the present invention, another non-contact charging system is disclosed, and the non-contact charging system of the present embodiment also includes a charging transmitting end and a charging receiving end.

As shown in FIG. 4, the charging transmitting end of the present invention includes a positioning magnetic field detector, a signal feedback circuit, a DC power supply, a DC/DC converter, a conversion circuit, a switch, a transmitting antenna, and a first processor;

The positioning magnetic field detector is configured to detect a magnetic quantity generated by a positioning magnetic field generator on a charging receiving end Field, in order to locate the charging connection end and the charging receiving end optimal charging coupling position; preferably, the positioning magnetic field detector periodically detects the magnetic field generated by the positioning magnetic field generator;

The first processor reads a current or voltage signal of the positioning magnetic field detector, and when the current or voltage signal is read, the indication signal feedback circuit sends a coupling positioning signal to the charging receiving end, and generates a charging instruction;

The DC/DC converter is configured to generate DC power having a variable voltage according to DC power obtained from a DC power source, and output the same to a conversion circuit;

The conversion circuit is configured to generate high frequency power having a variable frequency and a variable size, and transmitting to the transmitting antenna via the switch;

The switch is configured to transmit the generated high frequency power to the transmitting antenna, and the transmitting antenna is provided with a resonant circuit including a transmitting coil, and is electromagnetically coupled to the receiving antenna of the charging receiving end for charging the charging receiving end.

In this embodiment, preferably, the Hall sensor is disposed at a position where the upper surface of the charging transmitting end intersects the axis of the transmitting coil.

The mode converter is used to control whether the DC power source charges the rechargeable battery or is used to supply power to the charging transmitter. When the DC power source charges the rechargeable battery, the mode converter controls to disconnect the DC power supply from the DC/DC converter. When the charging transmitting end performs non-contact charging for the charging receiving end through the DC power source, the mode converter controls to disconnect the DC/DC converter from the rechargeable battery.

In this embodiment, the first processor is further configured to perform an abnormal prompt when a magnetic field generated by the positioning magnetic field generator is not detected within a predetermined time after the charging receiving end is placed on the charging transmitting end; or When the magnetic field generated by the positioning magnetic field generator is not detected again within a predetermined time after the normal charging is started, it is determined that the charging receiving end is moved, an abnormality is issued, or an instruction to reduce the charging current is issued.

As shown in FIG. 5, the charging receiving end of the present invention includes a positioning magnetic field generator and a positioning signal. a receiving circuit, a second processor, and a receiving antenna;

The second processor is configured to instruct, according to the coupled positioning signal, a resonant circuit of the receiving antenna to perform charging; the second processor is further configured to: when the charging receiving end is placed on the charging transmitting end, the predetermined time is still not received. When charging the coupled positioning signal sent by the receiving end, performing an abnormal prompt, including prompting the user to continue to move the charging receiving end; the second processor is further configured to: not receive the re-received within a predetermined time after starting normal charging When the positioning signal is coupled, it is determined that the charging receiving end is moved, and the abnormality prompt is performed again;

In this embodiment, preferably, the magnet is disposed at a position where a lower surface of the charging receiving end intersects with an axis of the receiving coil.

The working principle of this embodiment is: when the positioning magnetic field detector of the charging transmitting end detects the magnetic field generated by the positioning magnetic field generator on the charging receiving end, the two coils of the transmitting antenna and the receiving antenna are also exactly coincident or substantially coincident with each other. Position, at this time, the coupling strength of the two coils is the highest, and the charging efficiency is also the highest, indicating that the charging receiving end has been placed at the optimal charging position.

According to a fourth embodiment of the present invention, the charging receiving end includes a plurality of positioning magnetic field generators. Correspondingly, the charging transmitting end also includes a plurality of positioning magnetic field detectors, the plurality of positioning magnetic field generators and the plurality of positioning magnetic field detectors. One-to-one correspondence, the plurality of positioning magnetic field generators and the plurality of positioning magnetic field detectors may be respectively disposed at any positions of the charging receiving end and the charging transmitting end, when the plurality of positioning magnetic field generators and the plurality of positioning magnetic field detectors are When the detection is successful, the two coils of the transmitting antenna and the receiving antenna are also in the position where the axes coincide or substantially coincide. Compared to a positioning magnetic field generator and a positioning magnetic field In the case of a detector, this embodiment has a higher positioning accuracy. The remaining components of the charging transmitting end and the charging receiving end in this embodiment are the same as those in the third embodiment, and will not be described in detail herein.

The present invention also provides a non-contact charging method, which can be implemented by the non-contact charging system of the first to fourth embodiments described above, as shown in FIG. 6, the method comprising:

If yes, continue to detect the positioning magnetic field;

Preferably, the detecting and positioning magnetic field may be detected by a positioning magnetic field detector disposed on the charging transmitting end by a positioning magnetic field generator disposed on the charging receiving end, or may be detected by a positioning magnetic field disposed on the charging receiving end. The detector detects a magnetic field generated by a positioning magnetic field generator disposed on the charging transmitting end.

Preferably, the abnormal protection process includes performing an abnormality prompt when a coupled positioning signal is not received within a predetermined time after the charging receiving end is placed on the charging transmitting end; or when a predetermined time after starting normal charging, When the coupled positioning signal is received again, it is determined that the charging receiving end is moved, an abnormality prompt is issued, or an instruction to reduce the charging current is issued.

The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or within the technical scope disclosed by the present invention. Alternatives are intended to be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the appended claims.

Claims

A non-contact charging system, the system comprising a positioning magnetic field generating device for generating a positioning magnetic field, a positioning magnetic field detecting device corresponding to the positioning magnetic field generating device, and a wireless charging unit, the positioning magnetic field generating device and the positioning magnetic field detecting The device is oppositely disposed, the positioning magnetic field detecting device detects a positioning magnetic field generated by the positioning magnetic field generating device, and the wireless charging unit turns on wireless charging according to the detection result of the positioning magnetic field detecting device.
The non-contact charging system according to claim 1, wherein the positioning magnetic field generating device is disposed at a charging transmitting end, and the positioning magnetic field detecting device is disposed at a charging receiving end.
The contactless charging system of claim 2, wherein the charging receiving end further comprises a signal feedback circuit and a second processor, wherein the signal feedback circuit and the positioning magnetic field detecting device are respectively connected to the second processor, when the When the second processor detects that the positioning magnetic field detecting device has a current or voltage signal, it instructs the signal feedback circuit to send a coupled positioning signal to the charging transmitting end.
The contactless charging system according to claim 3, wherein the charging transmitting end further comprises a positioning signal receiving circuit and a first processor, wherein the positioning signal receiving circuit and the positioning magnetic field generating device are respectively connected to the first processor, The positioning signal receiving circuit is configured to receive a coupled positioning signal sent by the charging receiving end; the first processor is configured to generate a charging instruction according to the received coupled positioning signal; and the wireless charging unit performs charging according to the charging instruction.
The non-contact charging system according to claim 1, wherein the positioning magnetic field generating device is disposed at a charging receiving end, and the positioning magnetic field detecting device is disposed at a charging transmitting end.
The non-contact charging system according to claim 2 or 5, wherein the positioning magnetic field detecting device is a Hall sensor.
The non-contact charging system according to claim 2 or 5, wherein the positioning magnetic field generating device is a magnet.
The non-contact charging system according to claim 2 or 5, wherein the positioning magnetic field detecting device and the positioning magnetic field generating device are each one.
The contactless charging system according to claim 2 or 5, wherein the charging transmitting end further comprises a rechargeable battery for supplying power to the charging transmitting end without a DC power supply.
The contactless charging system according to claim 4, wherein the first processor is further configured to perform an abnormality prompt when a coupled positioning signal is not received within a predetermined time after the charging receiving end is placed on the charging transmitting end. Or the coupling position letter is not received again within the predetermined time after the start of normal charging When the number is determined, the position of the charging receiving end is determined to move, and an abnormality prompt or an instruction to reduce the charging current is issued.
A contactless charging method performed by the system of any one of claims 1-10, the method comprising:

Detecting whether the charging receiving end is placed on the charging transmitting end;

If yes, continue to detect the positioning magnetic field;

When the positioning magnetic field is detected, the charging transmitting end charges the charging receiving end;

When the positioning magnetic field is not detected, the abnormal protection process is performed.
The method according to claim 11, wherein the detecting positioning magnetic field detects a magnetic field generated by a positioning magnetic field generating device disposed on the charging transmitting end by a positioning magnetic field detecting device disposed on the charging receiving end; when the positioning magnetic field detecting device is detected When there is a current or voltage signal, a coupled positioning signal is sent to the charging transmitter.
The method according to claim 11, wherein the detecting positioning magnetic field detects a magnetic field generated by a positioning magnetic field generating device disposed on the charging receiving end by a positioning magnetic field detecting device disposed on the charging transmitting end; when the positioning magnetic field detecting device is detected When there is a current or voltage signal, a coupled positioning signal is sent to the charging receiving end.
The method according to claim 11, wherein the abnormality protection process includes performing an abnormality prompt when a coupled positioning signal is not received within a predetermined time after the charging receiving end is placed on the charging transmitting end; or when starting normal charging When the coupled positioning signal is not received again within the predetermined time, it is determined that the charging receiving end is moved, an abnormality prompt is issued, or an instruction to reduce the charging current is issued.