WO2015027917A1

WO2015027917A1 - Wireless power supply method, wireless power supply apparatus and wireless power supply system

Info

Publication number: WO2015027917A1
Application number: PCT/CN2014/085297
Authority: WO
Inventors: 李聃; 龙海岸; 娄兵兵
Original assignee: 海尔集团技术研发中心; 海尔集团公司
Priority date: 2013-08-29
Filing date: 2014-08-27
Publication date: 2015-03-05
Also published as: CN104426245B; CN104426245A

Abstract

A wireless power supply method, a wireless power supply apparatus and a wireless power supply system. The method comprises: detecting whether there is power consumption equipment in the working area of the wireless power supply apparatus, the working area comprising a plurality of differently-sized and concentrically-arrayed transmitting coils; if there is, establishing a communicative connection between the wireless power supply apparatus and the power consumption equipment, obtaining the power information of the power consumption equipment, and, on the basis of the power information, choosing to enable electric power transmission between the corresponding transmitting coils in the working area and a receiving coil of the power consumption equipment; and improving the coupling of the transmitting coils and the receiving coil so as to improve the efficiency of power supply.

Description

Wireless power supply method, wireless power supply device and wireless power supply system

Technical field

The present invention relates to the field of wireless power supply technologies, and in particular, to a wireless power supply method, a wireless power supply device, and a wireless power supply system.

Background technique

The wireless power supply technology realizes wireless transmission of energy by respectively providing corresponding electromagnetic transmitting coils and electromagnetic receiving coils in the wireless power supply device and the electric power device, but the power of different electrical devices is different and the size is different, so the size of the receiving coil is also Differently, the transmitting coil of the current wireless power supply device is a fixed single coil structure. When the receiving coil size in the electrical equipment is smaller than the transmitting coil, the receiving coil cannot be completely covered due to the large effective working area of the transmitting coil, resulting in electromagnetic leakage. If an uncovered area is placed with a metal foreign object, it may be hot due to eddy current loss caused by electromagnetic leakage, and there is a certain safety hazard; in addition, the coupling between the transmitting coil and the receiving coil is poor, and the energy transmission efficiency is low.

Summary of the invention

A brief summary of the invention is set forth below in order to provide a basic understanding of certain aspects of the invention. It should be understood that this summary is not an exhaustive overview of the invention. It is not intended to identify key or critical aspects of the invention, and is not intended to limit the scope of the invention. Its purpose is to present some concepts in a simplified form as a pre-

The invention provides a wireless power supply method, a wireless power supply device and a wireless power supply system, which can effectively improve power supply efficiency.

The invention provides a wireless power supply method, including:

Detecting whether there is an electric device in a working area of the wireless power supply device, wherein the working area includes a plurality of transmitting coils of different sizes and concentrically arranged;

If yes, establishing a communication connection between the wireless power supply device and the powered device, acquiring power information of the powered device, and selecting to turn on a corresponding transmitting coil and the working area in the working area according to the power information Power transmission between the receiving coils of the powered device.

The invention also provides a wireless power supply device, comprising:

a working area formed by a plurality of transmitting coils that are concentrically arranged in different sizes;

a control device, configured to control whether the electrical equipment is useful in the working area, control establishing a communication connection with the electrical equipment when the electrical equipment is used in the working area, and control acquiring power of the electrical equipment Information, and selecting, according to the power information, conducting power transmission between a corresponding transmitting coil in the working area and a receiving coil of the powered device.

In another aspect, the present invention also provides a wireless power supply system comprising the above wireless power supply device, further comprising a power device, wherein the power device is provided with a receiving coil for transmitting with a working area of the wireless power supply device The coil is coupled for power transmission.

The wireless power supply method, the wireless power supply device and the wireless power supply system provided by the invention can select a suitable transmitting coil for power transmission according to the power information of the powered device, improve the coupling of the transmitting coil and the receiving coil, and thereby improve the power supply efficiency.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any creative work.

FIG. 1 is a flowchart of an embodiment of a wireless power supply method provided by the present invention.

2 is a schematic structural diagram of a transmitting coil in an application scenario of a wireless power supply method according to the present invention.

FIG. 3 is a circuit diagram of a transmit coil control circuit in an application scenario of a wireless power supply method according to the present invention.

FIG. 4 is a schematic structural diagram of an embodiment of a wireless power supply device according to the present invention.

FIG. 5 is a schematic structural diagram of an embodiment of a wireless power supply system according to the present invention.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. Elements and features described in one of the figures or one embodiment of the invention may be combined with elements and features illustrated in one or more other figures or embodiments. It should be noted that components known to those of ordinary skill in the art that are not relevant to the present invention are omitted from the drawings and description for the sake of clarity. And the representation and description of the process. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without departing from the inventive scope are the scope of the present invention.

Embodiment 1

Referring to FIG. 1, the embodiment provides a wireless power supply method, including:

Step S101: detecting whether an electrical device is used in a working area of the wireless power supply device;

The working area includes a plurality of transmitting coils of different sizes and concentrically arranged;

Step S102, if yes, establishing a communication connection between the wireless power supply device and the powered device, acquiring power information of the powered device, and selecting to conduct a corresponding transmission in the working area according to the power information. Power transmission between the coil and the receiving coil of the powered device.

This embodiment does not limit the control processing method for detecting that there is no power-consuming device in the working area. For example, an optional implementation manner is: continuously detecting whether the electrical device is useful in the working area.

The wireless charging method provided in this embodiment can select a suitable transmitting coil for power transmission according to the power information of the powered device, improve the coupling between the transmitting coil and the receiving coil, and further improve the power supply efficiency.

As an optional implementation manner, detecting whether the electrical equipment is available in the working area of the wireless power supply device includes:

The giant magnetoresistive sensor detects the change of the magnetic field around the working area, and determines whether the electric equipment is useful in the working area according to the detection result.

The Giant Magneto Resistive (GMR) effect refers to the phenomenon that the resistivity of a magnetic material changes significantly when it has an external magnetic field as compared with the absence of an external magnetic field.

The giant magnetoresistive sensor is a sensor made according to the giant magnetoresistance effect. The receiving device is provided with a receiving coil inside, and the receiving coil and the transmitting coil in the working area are electromagnetic coils. When the working area has useful electrical equipment, the receiving coil Contact with the transmitting coil must change the magnetic field around the transmitting coil, and the resistivity of the giant magnetoresistive sensor changes accordingly. According to the change of the resistivity, it is possible to detect whether there is useful electrical equipment in the working area.

The giant magnetoresistive sensor detects whether there is useful electrical equipment in the working area, and the detection method is simple and the accuracy is high.

Further, establishing a communication connection between the wireless power supply device and the powered device includes:

The wireless power supply device in the standby state is powered on a preset combination of a plurality of transmitting coils, and the transmitting coils corresponding to each combination mode are energized for a preset period of time, so that the powered device is powered. The signal transmitting end enters an active state to establish a communication connection with the signal transmitting end of the powered device.

After detecting the useful electrical equipment in the working area, according to the preset combination manner of the plurality of transmitting coils, the transmitting coils in each combined mode are energized for a preset duration, and the preset duration is preferably 20 seconds to wake up the electrical equipment. The power transmitting device is powered to use the signal transmitting end of the electrical device to enter a working state, and the signal transmitting end can communicate with it under the working state.

Preset combinations include, but are not limited to, a single transmit coil, or multiple transmit coils in series.

Considering that the size and power of the receiving coil in different electrical equipment are different, if the size of the receiving coil is larger than the transmitting coil exceeds a certain range, the powering device cannot be woken up. Therefore, according to the preset combination, the first is The smallest transmitting coil of the smallest size is energized, and then powering a plurality of transmitting coils of different sizes in series, so that regardless of the size of the receiving coil of the powered device, the powered device can be awakened to ensure that the signal transmitting end of the powered device enters the working state. .

After establishing a communication connection with the powered device, the signal transmitting end of the powered device transmits power information, and after receiving the power information, selecting a corresponding transmitting coil to perform power transmission according to the power information.

As an optional implementation manner, the information includes: a power level of the powered device.

After receiving the power level of the powered device, according to the mapping relationship between the pre-established power level and the size of the transmitting coil, at least one transmitting coil adapted to the acquired power level is selected for power transmission.

Specifically, selecting to conduct power transmission between the at least one transmitting coil and the receiving coil in the working area that is adapted to the acquired power level comprises:

Selecting to conduct power transmission of a single transmit coil and the receive coil in the working area that is adapted to the acquired power level; or

Selectively conducting power transfer between the transmit coils in the working area that is adapted to the acquired power level in series with the receive coil.

Generally, the size of the transmitting coil is proportional to its power. The larger the size of the transmitting coil is, the larger the power is. The mapping relationship between the power level and the size of the transmitting coil is established, and the power level is selected according to the received power level. Transmitting coil, if the power level of the electric equipment is small, the transmitting coil with smaller size can be selected. If the power level of the electric equipment is large, the smaller coil and the large coil can be selected in series, which is the selected transmitting coil. When the power is turned on, the transmitting coil and the receiving coil are electromagnetically induced to transmit energy, and the electric device can enter a normal working state.

The wireless power supply method provided in this embodiment can select a suitable transmitting coil for power transmission according to power information of the powered device, and is compatible with power devices of different power levels, and has high energy transmission efficiency, avoiding mismatch between the transmitting coil and the receiving coil. The resulting security risks are high reliability and security.

The wireless power supply method provided in this embodiment is further described below through a specific application scenario.

In this application scenario, the electrical equipment is a kitchen appliance.

Generally, kitchen appliances can be divided into three categories according to power and size: Class A: power is about 200W, and the diameter of the receiving coil is about 8-12cm, such as manual mixer, fruit and vegetable juice machine, etc.; Class B: power is about 800W, the diameter of the receiving coil is about 13-17cm, such as mixer, coffee machine, bread machine, etc.; Class C: power is about 2.5KW, the receiving coil diameter is about 18-24cm, such as rice cooker, hot water bottle, smart cooker, etc.

As shown in FIG. 2, a plurality of transmitting coils of different sizes and concentrically arranged are disposed on a working area of the wireless power supply device. As an optional implementation manner, in the application scenario, two transmitting coils are used, respectively. _2, the outer diameter of the first transmitting coil L a transmitting coil L ₁ and a second transmission coil disposed on the first transmitting coil L and a first outer transmitting _{coil. _1.} ₁ concentrically L L ₁ of about 14cm, a second transmitting coil L ₂ The outer diameter is approximately 20 cm.

By varying magnetic field around a GMR sensor for detecting the transmit coil based on the detection result of the determination whether there are kitchen appliances within the work area, when a kitchen appliance is detected, the first long transmission coil L ₁ is energized preset, predetermined duration preferably 20 seconds, after the preset duration is reached, the first transmitting coil L ₁ and the second transmitting coil L _{2 are} energized for a preset period of time, that is, the first transmitting coil L ₁ and the second transmitting coil L _{2 are} operated in series, and wake up in the process. The kitchen appliance enables the signal transmitting end in the kitchen appliance to enter a working state, so that the signal transmitting end establishes a communication connection with the signal receiving end in the wireless power supply device, and the signal transmitting end transmits the power information of the kitchen appliance itself to the signal in the wireless power supply device. Receiving end.

After receiving the power information, the wireless power supply device selects a transmitting coil that is adapted to the acquired power level according to the mapping relationship between the power level and the size of the transmitting coil. If the power level is characterized by a hundred watt level, it is a Class A kitchen appliance or Class B kitchen appliances, which supply power to the first transmitting coil L ₁ , because the first transmitting coil L ₁ and the receiving coils of the Class A kitchen appliances or the Class B kitchen appliances are matched, thereby achieving optimal energy transmission efficiency; Characterization of a kilowatt power information, i.e. class C kitchen appliances, for the first transmitting coil L ₁ and a second power transmitting coil L _2, i.e., a first transmitting coil L ₁ and L ₂ of the second transmitting coil series operation, so that The output power matches the power of the Class C kitchen appliance.

Referring to FIG. 3, FIG. 3 is a transmission coil control circuit diagram. The control device includes a DC power supply module, an inverter module, and a switch. The DC power U _dc outputted by the DC power module is converted into AC power by the inverter module, that is, the inverter module is used for Convert the DC power output from the DC power module to AC power. The first switch tube S ₁ , the second switch tube S ₂ , the third switch tube S ₃ and the fourth switch tube S ₄ form an inverter module, and the first transmit coil L ₁ and the second transmit coil L ₂ and the second capacitor C ₂ composition of the first resonance circuit, a first transmitting coil L ₁ and a first capacitor C ₁ constitute a second resonant circuit. Each of the terminals of the changeover switch is connected to the plurality of transmit coils. The switch SW control selects to supply power to the corresponding transmitting coil L_Tx to control the transmitting coil to emit energy of different power levels. When the kitchen appliance belongs to Class A or Class B, the switching switch SW is placed at the "0" terminal, and the first transmitting coil L _{1 is} operated to provide power to the class a or class B receiving coil L_Rx kitchen appliances; when kitchen appliances are class C, the changeover switch SW set to "1" side, a first transmitting coil and the second transmission coil L ₁ L ₂ Working in series, transmitting a higher power level of energy to provide power to the receiving coil L_Rx of the Class C kitchen appliance. That is, the switch is used to gate power transmission of a single transmit coil and the receive coil; or to transmit power between the cascaded transmit coils and the receive coil.

In addition, it can be further extended to a three-coil structure or a structure of more coils, which can be compatible with more power-grade electrical equipment, and meets the need for powering more electrical equipment.

Embodiment 2

Referring to FIG. 4, the embodiment provides a wireless power supply device, including:

a working area 201 formed by a plurality of transmitting coils of different sizes and concentrically arranged;

The control device 202 is configured to control whether the electrical device is used in the working area, and when the electrical device is used in the working area, control establishes a communication connection with the powered device, and controls acquiring the powered device. Power information, and selecting, according to the power information, conducting power transmission between a corresponding transmitting coil in the working area and a receiving coil of the powered device.

As an optional implementation manner, the wireless power supply apparatus provided in this embodiment further includes a giant magnetoresistive sensor 203, configured to detect whether the electrical equipment is in the working area; the receiving device is internally provided with a receiving coil, due to the receiving coil and The transmitting coils in the working area are all electromagnetic coils. When there is electrical equipment in the working area, the receiving coil and the transmitting coil are in contact, which must change the magnetic field around the transmitting coil. The giant magnetoresistive sensor detects the magnetic field changes around the working area. When the magnetic field changes The resistivity of the giant magnetoresistive sensor 203 is also changed accordingly, and the control device 202 can determine whether the electrical equipment is available in the working area according to the change of the resistivity.

Further, the wireless power supply device further includes a signal receiving end 204 for receiving information transmitted by the signal transmitting end of the powered device.

When the control device 202 determines that the electrical device is in the working area 201, the wireless power supply device in the standby state is sequentially powered by the preset combination of the plurality of transmitting coils, and the preset time for each corresponding transmitting mode is energized. The signal transmitting end of the electrical device is used to enter a working state to establish a communication connection between the signal receiving end 204 and the signal transmitting end of the powered device.

After establishing a communication connection with the powered device, the signal transmitting end of the powered device transmits power information, and after receiving the power information, the signal receiving terminal 204 selects a corresponding transmitting coil to perform power transmission according to the power information.

As an alternative embodiment, the information includes the power level of the powered device.

The control device 202 is further configured to control the signal receiving end 204 to receive the power level of the powered device, and select at least one transmitting coil adapted to the acquired power level to perform power according to a mapping relationship between the pre-established power level and the transmitting coil size. transmission.

Generally, the size of the transmitting coil is proportional to its power. The larger the size of the transmitting coil is, the larger the power is. The mapping relationship between the power information and the size of the transmitting coil is established, and the power information is selected according to the received power information. The transmitting coil, if the power of the electric device is small, the transmitting coil with a smaller size can be selected. If the power of the electric device is large, the smaller coil and the large coil can be selected in series to electrify the selected transmitting coil. The transmitting coil and the receiving coil are electromagnetically induced to transmit energy, and the electric device can enter a normal working state.

For a specific application scenario and a circuit diagram of the control device, refer to the wireless power supply method embodiment, and details are not described herein.

The wireless power supply device provided by the embodiment can select a suitable transmitting coil for power transmission according to the information of the powered device, and is compatible with the power device with different power levels, and the energy transmission efficiency is high, and the mismatch between the transmitting coil and the receiving coil is avoided. The safety hazard has high reliability and safety, simple structure and strong practicability.

Embodiment 3

Referring to FIG. 5, the embodiment provides a wireless power supply system, including:

The wireless power supply device 301 and the consumer device 302 are provided with a receiving coil for coupling with the transmitting coil in the wireless power feeding device 301 for power transmission.

For the structure and principle of the wireless power supply device 301, refer to the second embodiment, and details are not described herein again.

The power device 302 is further provided with a signal transmitting end 303 for communicating with the signal receiving end of the wireless power supply device 301 to transmit information to the signal receiving end, the information including the power information of the powered device itself.

The wireless power supply system provided in this embodiment can select a suitable transmitting coil for power transmission according to the information of the powered device, and is compatible with the power devices of different power levels, and the energy transmission efficiency is high, and the mismatch between the transmitting coil and the receiving coil is avoided. The safety hazard has high reliability and safety, simple structure and strong practicability.

In the above embodiments of the present invention, the serial numbers of the embodiments are merely for convenience of description, and do not represent the advantages and disadvantages of the embodiments. The descriptions of the various embodiments are all different, and the parts that are not detailed in a certain embodiment can be referred to the related description of other embodiments.

One of ordinary skill in the art can understand that all or part of the steps of the above method embodiments are implemented. The foregoing program may be stored in a computer readable storage medium, and when executed, the program includes the steps of the foregoing method embodiment; and the foregoing storage medium includes: a read only memory (Read-Only Memory, ROM for short), random access memory (RAM), disk or optical disk, and other media that can store program code.

In the embodiments of the apparatus and method of the present invention, it is apparent that the various components or steps may be decomposed, combined, and/or decomposed and recombined. These decompositions and/or recombinations should be considered as equivalents to the invention. Also, in the above description of specific embodiments of the present invention, features described and/or illustrated with respect to one embodiment may be used in the same or similar manner in one or more other embodiments, and in other embodiments. The features are combined or substituted for features in other embodiments.

It should be emphasized that the term "comprising" or "comprising" is used to mean the presence of a feature, element, step or component, but does not exclude the presence or addition of one or more other features, elements, steps or components.

It is to be understood that the present invention and its advantages are described in detail, and it is understood that various changes, substitutions and changes can be made without departing from the spirit and scope of the invention as defined by the appended claims. Transform. Further, the scope of the invention is not limited to the specific embodiments of the processes, devices, means, methods and steps described in the specification. It will be readily apparent to those skilled in the art from this disclosure that the present invention can be used in accordance with the present invention to perform substantially the same functions as the corresponding embodiments described herein or to obtain substantially the same results as the present and future Process, equipment, means, method or step to be developed. Therefore, the appended claims are intended to cover such a process, apparatus, means, methods or steps.

Claims

A wireless power supply method includes:

Detecting whether there is an electric device in a working area of the wireless power supply device, wherein the working area includes a plurality of transmitting coils of different sizes and concentrically arranged;

If yes, establishing a communication connection between the wireless power supply device and the powered device, acquiring power information of the powered device, and selecting to turn on a corresponding transmitting coil and the working area in the working area according to the power information Power transmission between the receiving coils of the powered device.
The wireless power supply method according to claim 1, wherein the detecting whether the electrical device is useful in the working area comprises:

The change of the magnetic field around the working area is detected by the giant magnetoresistive sensor, and whether the electric equipment is useful in the working area is determined according to the detection result.
The wireless power supply method according to claim 1, wherein the establishing a communication connection between the wireless power supply device and the powered device comprises:

The wireless power supply device in the standby state is powered on a preset combination of a plurality of transmitting coils, and the transmitting coils corresponding to each combination mode are energized for a preset period of time, so that the signal transmitting end of the powered device enters a working state. To establish a communication connection with the signal transmitting end of the powered device.
The wireless power supply method according to claim 1, wherein

The power information includes a power level of the powered device;

Obtaining the power information of the powered device and selecting, according to the power information, the power transmission between the corresponding transmitting coil in the working area and the receiving coil of the powered device, including:

Obtaining a power level of the powered device, and selecting, according to a mapping relationship between the pre-established power level and the size of the transmitting coil, selecting at least one transmitting coil in the working area that is adapted to the acquired power level, and receiving the Power transfer between coils.
The wireless power supply method according to claim 4, wherein said selecting to turn on at least one transmitting coil and said receiving coil in said working area that are adapted to the acquired power level The power transmission between, including:

Selecting to conduct power transmission of a single transmit coil and the receive coil in the working area that is adapted to the acquired power level; or

Selectively conducting power transfer between the transmit coils in the working area that is adapted to the acquired power level in series with the receive coil.
A wireless power supply device comprising:

a working area formed by a plurality of transmitting coils that are concentrically arranged in different sizes;

a control device, configured to control whether the electrical equipment is useful in the working area, control establishing a communication connection with the electrical equipment when the electrical equipment is used in the working area, and control acquiring power of the electrical equipment Information, and selecting, according to the power information, conducting power transmission between a corresponding transmitting coil in the working area and a receiving coil of the powered device.
The wireless power supply device of claim 6, wherein the wireless power supply device further comprises:

a giant magnetoresistive sensor for detecting a change in a magnetic field around the working area; and the control device determining whether the electric device is useful in the working area according to the detection result.
The wireless power supply device of claim 6, wherein the wireless power supply device further comprises:

a signal receiving end, configured to receive power information sent by a signal transmitting end of the powered device;

The control device is further configured to control, according to a preset combination manner of the plurality of transmitting coils, the wireless power feeding device in a standby state, and sequentially energize the transmitting coils corresponding to each combination mode for a preset duration, so that the powering device is The signal transmitting end enters an active state to establish a communication connection with the signal transmitting end of the powered device.
The wireless power supply device according to claim 6, wherein

The power information includes a power level of the powered device;

The control device is further configured to control the power level of the powered device, and select, according to a mapping relationship between the pre-established power level and the size of the transmitting coil, to turn on the working area to match the acquired power level. Power transmission between at least one transmit coil and the receive coil.
The wireless power supply device according to claim 9, wherein

The control device includes a DC power module, an inverter module, and a switch;

The inverter module is configured to convert DC power output by the DC power module into AC power;

Each of the terminals of the changeover switch is respectively connected to the plurality of transmit coils, and the switch is used for strobing power transmission of a single transmit coil and the receive coil; or Power transmission between the receiving coils.
A wireless power supply system comprising:

a wireless power supply device according to any one of claims 6 to 10;

An electrical device, the electrical device being provided with a receiving coil for coupling with a transmitting coil of a working area of the wireless power supply device for power transmission.
The wireless power supply system of claim 11, wherein the powered device further comprises:

And a signal transmitting end, configured to send the power information to the wireless power supply device.