Method and apparatus for wireless power supply for direct current power supply system

Abstract

The application relates to the technical field of intelligent household appliances, and discloses a wireless power supply method for a direct-current power supply system, which is applied to a mobile device, the mobile device comprising a receiving coil, and the method comprises the following steps: receiving a detection signal; when the detection signal is a first signal, adjusting the mobile device to move towards the direction from which the first signal is emitted at a first speed; or when the detection signal comprises the first signal and a second signal, adjusting the mobile device to move towards the direction from which the first signal is emitted at a second speed; wherein the first speed is greater than the second speed. According to whether the received detection signal is the first signal or comprises the first signal and the second signal, the moving speed and the moving direction of the mobile device are adjusted, so that the mobile device can quickly and accurately approach a power supply device. The application further discloses a device for wireless power supply of a direct-current power supply system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wireless power supply, for example, to a method and device for wireless power supply of a direct current power supply system. BACKGROUND

[0002] Wireless power supply does not require any physical connection, and electric energy can be transmitted to a load in close proximity without contact. Wireless charging devices are increasingly widely used in people's lives. Wireless charging devices can achieve wireless electric energy transmission in various ways, such as electromagnetic induction, electromagnetic resonance, electromagnetic radiation, etc. A wireless charging system includes a receiving coil and a transmitting coil, the transmitting coil is used for transmitting energy, and the receiving coil is used for receiving energy. The transmitting coil is arranged on a power supply device, and in some existing schemes, the receiving coil is arranged on a mobile device. The power supply device can obtain the position information of the mobile device, and the mobile device can move towards the power supply device. When the mobile device is located at a preset position, the power supply device charges the mobile device.

[0003] In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art: the movement of the mobile device to the power supply device is not fast and accurate enough. SUMMARY

[0004] To provide a basic understanding of some aspects of the disclosed embodiments, the following brief summary is given. The summary is not an overall description of the application, nor is it intended to identify key / important elements or delineate the scope of the embodiments, but to serve as a prelude to the detailed description below.

[0005] The embodiments of the present disclosure provide a method and device for wireless power supply of a direct current power supply system to solve the technical problem that the movement of the mobile device to the power supply device is not fast and accurate enough.

[0006] In some embodiments, the method for wireless power supply of a direct current power supply system is applied to a mobile device, the mobile device includes a receiving coil, and the method for wireless power supply of the mobile device includes: receiving a detection signal; when the detection signal is a first signal, adjusting the mobile device to move at a first speed towards the direction from which the first signal is emitted; or when the detection signal includes a first signal and a second signal, adjusting the mobile device to move at a second speed towards the direction from which the first signal is emitted; wherein the first speed is greater than the second speed.

[0007] In some embodiments, the method for wireless power supply of a direct current power supply system is applied to a power supply device, and includes: transmitting a detection signal and identifying whether a mobile device exists in a preset area; when the mobile device is identified, starting power supply.

[0008] In some embodiments, the apparatus for wireless power supply of a direct current power supply system comprises a processor and a memory storing program instructions, the processor is configured to execute the program instructions to perform the method for wireless power supply of a direct current power supply system provided by the foregoing embodiments.

[0009] The method and apparatus for wireless power supply of a direct current power supply system provided by the embodiments of the present disclosure can achieve the following technical effects: according to whether the received probe signal is a first signal or a signal comprising a first signal and a second signal, the moving speed and moving direction of the mobile device are adjusted according to the received signal, so that the mobile device can quickly and accurately approach the power supply device. The power supply device transmits a probe signal and identifies whether there is a mobile device in the preset area, and starts power supply when the mobile device enters the preset area, so that the mobile device can move to the power supply device for charging.

[0010] The foregoing general description and the following description are only exemplary and explanatory, and are not used to limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0011] One or more embodiments are exemplarily illustrated by corresponding drawings, which do not constitute limitation on the embodiments, elements with the same reference numerals in the drawings are shown as similar elements, the drawings do not constitute proportional limitation, and wherein:

[0012] Figure 1 is a schematic diagram of a method for wireless power supply of a direct current power supply system provided by an embodiment of the present disclosure;

[0013] Figure 2 is a schematic diagram of another method for wireless power supply of a direct current power supply system provided by an embodiment of the present disclosure;

[0014] Figure 3 is a schematic diagram of a method for wireless power supply of a direct current power supply system provided by an embodiment of the present disclosure;

[0015] Figure 4 is a schematic diagram of an apparatus for wireless power supply of a direct current power supply system provided by an embodiment of the present disclosure. DETAILED DESCRIPTION

[0016] In order to be able to understand the features and technical contents of the embodiments of the present disclosure more fully, the implementation of the embodiments of the present disclosure is described in detail below, and the attached drawings are only used for reference and do not constitute limitation on the embodiments of the present disclosure. In the following technical description, in order to facilitate explanation, a plurality of details are provided to provide a full understanding of the disclosed embodiments. However, one or more embodiments can still be implemented without these details. In other cases, in order to simplify the drawings, well-known structures and devices can be simplified.

[0017] The terms "first", "second", and the like in the description and in the claims of the embodiments of the present disclosure and the above-described drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so as to implement the embodiments of the present disclosure described herein. In addition, the terms "comprise" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0018] In combination Figure 1 As shown, the embodiments of the present disclosure provide a method for wireless power supply of a direct current power supply system, applied to a mobile device, the mobile device comprising a receiving coil, the method for wireless power supply of the direct current power supply system comprising:

[0019] S01, receiving a detection signal;

[0020] S02, detecting whether the detection signal comprises a first signal and a second signal simultaneously, if yes, performing step S03, if not, performing step S04;

[0021] S03, adjusting the mobile device to move at a second speed towards the direction from which the first signal is emitted;

[0022] S04, adjusting the mobile device to move at a first speed towards the direction from which the first signal is emitted;

[0023] Wherein the first speed is greater than the second speed.

[0024] When the detection signal only comprises the first signal, it indicates that the mobile device has a certain distance from the position from which the first signal is emitted. The mobile device is adjusted to move at the first speed towards the direction from which the first signal is emitted, so as to approach the position from which the first signal is emitted. Optionally, the propagation distance of the first signal is greater than the propagation distance of the second signal. Then, when the mobile device moves within a certain area, it can only receive the first signal, or receive the first signal and the second signal simultaneously.

[0025] It can be considered that when the probe signal only includes the first signal, the mobile device is far away from the position where the first signal is emitted. In this case, the mobile device is caused to move towards the direction where the first signal is emitted at a first speed. The first speed can be set as a faster speed, so that the mobile device far away from the position where the first signal is emitted can approach the position where the first signal is emitted faster. When the probe signal includes the first signal and the second signal, that is, both the first signal and the second signal are received, the mobile device is closer to the position where the first signal is emitted than when only the first signal is received. The mobile device is adjusted to move beyond the position where the first signal is emitted at a second speed, and the second speed is less than or equal to the first speed. In this way, when the mobile device is close to the position where the first signal is emitted, the speed is slowed down, so that the mobile device can move to the position where the first signal is emitted more accurately, and the phenomenon that the mobile device cannot stop in time due to too high speed can be avoided.

[0026] By using the embodiment, when the mobile device is far away from the position where the first signal is emitted, the mobile device can move to the position where the first signal is emitted faster, and when the mobile device is close to the position where the first signal is emitted, the mobile device can move to the position where the first signal is emitted more accurately, and the phenomenon that the mobile device cannot stop in time due to too high speed can be avoided.

[0027] Optionally, the mobile device is provided with a motion control module configured to adjust the moving direction and the moving speed of the mobile device. By using the motion control module, the moving direction of the mobile device is controlled according to the direction where the first signal is emitted, and the moving speed of the mobile device is controlled according to whether only the first signal is received. The motion control module can be realized by using existing products, such as the motion control module of a household sweeper.

[0028] Optionally, the mobile device receives the probe signal. The mobile device is provided with a probe signal receiving device to receive the probe signal. Optionally, the mobile device is a sweeper robot. The sweeper robot adjusts the moving speed and the moving direction of the sweeper robot in a certain area in a room according to the received signal, so as to approach the position where the first signal is emitted. Optionally, the power supply device emits the probe signal. In this way, the mobile device can approach the power supply device for charging. The power supply device emits both the first signal and the second signal, and when the mobile device approaches the position where the first signal is emitted, the mobile device approaches the power supply device.

[0029] In some embodiments, before receiving the probe signal, the method further includes: emitting a signal indicating that the mobile device needs to be charged. The mobile device emits the signal indicating that the mobile device needs to be charged when the mobile device needs to be charged. Optionally, the power supply device emits the probe signal after receiving the signal indicating that the mobile device needs to be charged. In this way, the mobile device can receive the probe signal and perform the next operation according to the probe signal.

[0030] In some embodiments, the second signal is an ultrasonic signal. When the ultrasonic signal is used, the propagation distance of the ultrasonic signal can be adjusted to be smaller than the propagation distance of the first signal, so that the mobile device can determine that it is in a region close to the position from which the first signal is emitted when it receives the first signal and the second signal. Optionally, the power supply device is provided with an ultrasonic transmitter. The ultrasonic signal is transmitted by the ultrasonic transmitter.

[0031] In some embodiments, when the detection signal includes the first signal and the second signal, the method further includes adjusting the deflection angle of the mobile device according to the second signal so that the receiving coil is aligned with the transmitting coil of the power supply device.

[0032] The receiving coil of the mobile device is used to receive electric energy, and the transmitting coil of the power supply device transmits electric energy. The charging efficiency of the power supply device for the mobile device is related to the alignment of the receiving coil and the transmitting coil. If the receiving coil and the transmitting coil are not aligned, the charging efficiency will be reduced. When the receiving coil and the transmitting coil are aligned, the charging efficiency can be maximized. According to the ultrasonic signal, it can be determined whether the receiving coil and the transmitting coil are aligned. By adjusting the deflection angle of the mobile device, the receiving coil and the transmitting coil of the power supply device can be aligned, thereby improving the charging efficiency. In this embodiment, the mobile device adjusts its posture when it is close to the position from which the first signal is emitted, so that the receiving coil is aligned with the transmitting coil. Compared with adjusting the posture when the mobile device is far away from the position from which the first signal is emitted, it is easier to control and the alignment of the coils can also be achieved.

[0033] In combination with Figure 2 In some embodiments, adjusting the deflection angle of the mobile device according to the second signal includes:

[0034] S05, determining the time difference between the received first ultrasonic signal and the second ultrasonic signal;

[0035] S06, determining the deflection angle between the receiving coil and the transmitting coil according to the time difference;

[0036] S07, adjusting the deflection of the receiving coil according to the deflection angle.

[0037] The side of the transmitting coil of the power supply device is provided with a first ultrasonic transmitter, and the other side is provided with a second ultrasonic transmitter. The first ultrasonic transmitter and the second ultrasonic transmitter emit signals at the same time. The signal emitted by the first ultrasonic transmitter is a first ultrasonic signal, and the signal emitted by the second ultrasonic transmitter is a second ultrasonic signal. The side and the other side of the transmitting coil are located on the same plane of the transmitting coil, which is equivalent to the left and right sides of the transmitting coil. When there is an offset angle between the mobile device and the power supply device, that is, the receiving coil of the mobile device and the transmitting coil of the power supply device are not aligned, the mobile device will not receive the first ultrasonic signal and the second ultrasonic signal at the same time, but will receive them in sequence. Therefore, there is a time difference between the receiving time points of the first ultrasonic signal and the second ultrasonic signal. According to the time difference and the propagation speed of the ultrasonic wave and other parameters, the offset angle between the receiving coil and the transmitting coil can be calculated. The specific calculation method belongs to the existing technology of ultrasonic detection. The time difference can also be detected while the mobile device is deflected until the time difference is zero, which means that the receiving coil and the transmitting coil have been aligned.

[0038] Optionally, the mobile device is provided with a timer. The time difference between the received first ultrasonic signal and the second ultrasonic signal is determined by the timer. Optionally, the mobile device is also provided with a calculation module. The offset angle is calculated by the calculation module according to the time difference, the ultrasonic wave propagation speed and other parameters.

[0039] In some embodiments, the first ultrasonic signal and the second ultrasonic signal are ultrasonic signals emitted simultaneously from different parts of the power supply device.

[0040] The first ultrasonic signal and the second ultrasonic signal are signals emitted from different parts of the power supply device. For example, two ultrasonic transmitters are arranged around the transmitting coil, and a signal receiving device is arranged around the receiving coil. When the time required for the two signals to reach the signal receiving device is different, it indicates that there is an angle deviation between the receiving coil and the transmitting coil, resulting in different distances of the two ultrasonic signals. When the time required for the two signals to reach the signal receiving device is the same, it indicates that the receiving coil and the transmitting coil are aligned. By using this embodiment, the receiving coil and the transmitting coil can be adjusted to be aligned by ultrasonic signals.

[0041] In some embodiments, the first signal is an infrared signal. The infrared signal can propagate at a long distance, which is suitable for detecting the mobile device. Especially when the mobile device is used indoors, the infrared signal can propagate in a preset room, and the mobile device can receive the infrared signal when moving in the preset room. Optionally, the power supply device is provided with an infrared signal emitting device. When the mobile device receives the infrared signal, it moves towards the direction from which the infrared signal is emitted, so as to approach the power supply device.

[0042] When the second signal is an ultrasonic signal, by adjusting the parameters of the ultrasonic signal, the propagation distance of the ultrasonic signal is less than the propagation distance of the infrared signal, so that the mobile device can only adjust the moving direction when receiving only the infrared signal, and move to the direction of the infrared signal, and adjust the offset angle of the receiving coil and the transmitting coil according to the ultrasonic signal when receiving the infrared signal and the ultrasonic signal at the same time.

[0043] Optionally, the method for wirelessly powering the mobile device further comprises: when the mobile device moves into the preset area, adjusting the mobile device to move at a third speed, the third speed being less than the second speed. When the mobile device moves into the preset area, the power supply device starts to supply power, and the distance between the mobile device and the power supply device is already very close, so the speed can be reduced to the third speed, which is convenient for further fine adjustment and also convenient for the mobile device to stop.

[0044] In some embodiments, the method for wirelessly powering the direct current power supply system further comprises:

[0045] detecting the voltage value of the mobile device;

[0046] When the voltage value is greater than or equal to the preset voltage, the mobile device stops moving.

[0047] When the transmitting coil supplies power to the receiving coil, the voltage value of the mobile device can be detected, and when the voltage value is greater than or equal to the preset voltage, it indicates that the distance between the mobile device and the power supply device is appropriate, and the charging efficiency is high, so the mobile device can be controlled to stop moving for charging. Optionally, the power supply device is provided with a position sensor configured to detect the position information of the mobile device. When the mobile device is located in the preset area, the voltage value of the mobile device is detected. When the mobile device enters the preset area, the transmitting coil supplies power to the power supply coil, and the mobile device can perform the measurement of the receiving voltage value. When the voltage value is greater than the preset voltage, the mobile device is adjusted from moving to a stationary state. In this voltage range, the charging efficiency of the mobile device is relatively high.

[0048] In combination with Figure 3 As shown in the figure, the embodiment of the present disclosure provides a method for wirelessly powering a direct current power supply system, applied to a power supply device, comprising:

[0049] S08, transmitting a detection signal and identifying whether there is a mobile device in the preset area;

[0050] S09, when the mobile device is identified, starting to supply power.

[0051] The power supply device emits a detection signal to enable the mobile device to approach the power supply device according to the signal. The preset area is an area in which the power supply device has a high charging efficiency for the mobile device, and when the mobile device is identified to enter the preset area, the power supply device can be started to charge. Optionally, the power supply device is provided with an infrared signal emitting device. In this way, the mobile device can be adjusted in the moving direction by emitting an infrared signal through the infrared signal emitting device. Optionally, the power supply device is provided with an ultrasonic wave emitting device. In this way, the mobile device can adjust the offset angle of itself to align the receiving coil and the transmitting coil of the power supply device by emitting an ultrasonic wave signal through the ultrasonic wave emitting device. Optionally, the power supply device is provided with an identification module. When the mobile device enters the preset area, the identification module can identify the mobile device. Optionally, the identification module is a camera. The camera is adjusted to align the preset area, and when the mobile device enters the preset area, the mobile device can be photographed. The direct current is input into the power supply device, the power supply device converts the direct current into high-frequency alternating current, and then inputs the alternating current into the transmitting coil to generate a certain current in the receiving coil of the mobile device through electromagnetic induction. The method can also be used for an alternating current power supply system to realize wireless power supply for the mobile device.

[0052] In some embodiments, the method for wireless power supply for a direct current power supply system further comprises:

[0053] receiving the power amount sent by the mobile device;

[0054] stopping power supply when the mobile device is fully charged.

[0055] The mobile device sends the power amount to the power supply device, and when the mobile device is fully charged, the power supply device can stop power supply. In this embodiment, when the power supply device stops power supply can be controlled.

[0056] The present disclosure provides an apparatus for wireless power supply for a direct current power supply system, comprising a processor and a memory storing program instructions, the processor is configured to execute the program instructions to perform the method for wireless power supply for a direct current power supply system provided by any one of the preceding embodiments.

[0057] In combination with Figure 4As shown, the apparatus for wireless power supply of a direct current power supply system provided by the embodiments of the present disclosure includes a processor 100 and a memory 101. Optionally, the apparatus can further include a communication interface 102 and a bus 103. The processor 100, the communication interface 102 and the memory 101 can complete communication with each other through the bus 103. The communication interface 102 can be used for information transmission. The processor 100 can invoke the logical instructions in the memory 101 to execute the method for wireless power supply of a direct current power supply system of the above-mentioned embodiments.

[0058] In addition, the logical instructions in the memory 101 described above can be implemented in the form of a software functional unit and sold or used as an independent product, which can be stored in a computer readable storage medium.

[0059] The memory 101 as a computer readable storage medium can be used to store software programs, computer executable programs, such as program instructions / modules corresponding to the method in the embodiments of the present disclosure. The processor 100 executes the function application and data processing by running the program instructions / modules stored in the memory 101, that is, implements the method for wireless power supply of a direct current power supply system in the above-mentioned embodiments.

[0060] The memory 101 can include a program storage area and a data storage area, wherein the program storage area can store an operating system and application programs required by at least one function; the data storage area can store data created according to the use of the terminal device, etc. In addition, the memory 101 can include a high-speed random access memory, and can also include a non-volatile memory.

[0061] The embodiments of the present disclosure provide a product (for example: computer, mobile phone and the like), containing the above-mentioned apparatus for wireless power supply of a direct current power supply system.

[0062] The embodiments of the present disclosure provide a computer readable storage medium, which stores computer executable instructions, and the computer executable instructions are configured to execute the above-mentioned method for wireless power supply of a direct current power supply system.

[0063] The embodiments of the present disclosure provide a computer program product, which includes a computer program stored on a computer readable storage medium, and the computer program includes program instructions, when the program instructions are executed by a computer, the computer executes the above-mentioned method for wireless power supply of a direct current power supply system.

[0064] The above-mentioned computer readable storage medium can be a transitory computer readable storage medium, or a non-transitory computer readable storage medium.

[0065] The technical solutions of the embodiments of the present disclosure can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes one or more instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method disclosed in the embodiments of the present disclosure. The aforementioned storage medium can be a non-transitory storage medium, including: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media that can store program codes, or can be a transitory storage medium.

[0066] The above description and drawings sufficiently illustrate the embodiments of the present disclosure to enable one skilled in the art to practice them. Other embodiments can include structural, logical, electrical, process, and other changes. The embodiments represent only a few of the possible variations. Individual components and functions are optional unless explicitly required, and the order of operations can be changed. Parts and features of some embodiments can be included in or replace parts and features of other embodiments. Also, the words used in this application are used only to describe the embodiments and not to limit the claims. As used in the description of the embodiments and the claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Similarly, the term "and / or" as used in this application refers to any and all possible combinations of one or more associated listed items. In addition, when used in this application, the term "comprise" and its variants "comprises" and / or "comprising" and the like mean the presence of the stated features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. Without more limitations, the element defined by the phrase "comprising a" does not exclude the presence of additional identical elements in the process, method, or device including the stated element. In this document, each embodiment focuses on the differences from other embodiments, and the same or similar parts between various embodiments can be referred to each other. For the method, product, etc. disclosed in the embodiments, if it corresponds to the method part disclosed in the embodiments, the relevant part can be referred to the description of the method part.

[0067] Those skilled in the art can understand that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be realized by electronic hardware or a combination of computer software and electronic hardware. Whether the functions are realized in hardware or software depends on the specific application and design constraints of the technical solution. The skilled person can use different methods for each specific application to realize the described functions, but such implementation should not be considered beyond the scope of the embodiments of the present disclosure. The skilled person can clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described system, device and unit can refer to the corresponding processes in the foregoing method embodiments, which will not be repeated here.

[0068] In the embodiments disclosed herein, the disclosed methods, products (including but not limited to devices, equipment, etc.) can be implemented in other ways. For example, the above-described device embodiments are only schematic, for example, the division of the units can only be a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interface, device or unit, and can be electrical, mechanical or other forms. The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, that is, they can be located in one place, or can be distributed on a plurality of network units. Part or all of the units can be selected according to actual needs to implement the embodiments. In addition, each functional unit in the embodiments of the present disclosure can be integrated in one processing unit, or each unit can be a physically independent unit, or two or more units can be integrated in one unit.

[0069] The computer program instructions can also be loaded onto a computer, other programmable data processing apparatus, or other processing device to cause a series of operational steps to be performed on the computer, other programmable apparatus or other processing device to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide processes for implementing the functions / acts specified in the flowchart and / or block diagram block or blocks.

Claims

1. A method for wireless power supply in a DC power supply system, applied to a mobile device, the mobile device including a receiving coil, characterized in that, The DC power supply system includes power supply equipment, and the method includes: Receive detection signals; When the detected signal is the first signal, adjust the mobile device to move at a first speed in the direction from which the first signal was emitted; or... When the detection signal includes a first signal and a second signal, the mobile device is adjusted to move at a second speed toward the direction from which the first signal is emitted. Wherein, the first speed is greater than the second speed; the first signal is an infrared signal; the second signal is an ultrasonic signal, and the propagation distance of the ultrasonic signal is made lower than the propagation distance of the first signal by adjusting the parameters of the ultrasonic signal; the power supply device emits both the first signal and the second signal.

2. The method according to claim 1, characterized in that, When the detection signal includes a first signal and a second signal, it further includes: Adjust the deflection angle of the mobile device according to the second signal so that the receiving coil is aligned with the transmitting coil of the power supply device.

3. The method according to claim 2, characterized in that, The adjustment of the deflection angle of the mobile device according to the second signal includes: Determine the time difference between the received first and second ultrasonic signals; The offset angle between the receiving coil and the transmitting coil is determined based on the time difference; The receiving coil is deflected by adjusting the offset angle.

4. The method according to claim 3, characterized in that, The first ultrasonic signal and the second ultrasonic signal are ultrasonic signals emitted simultaneously from different parts of the power supply equipment.

5. The method according to any one of claims 1 to 4, characterized in that, Also includes: Detect the voltage value of the mobile device; The mobile device stops moving when the voltage value is greater than or equal to the preset voltage.

6. A method for wireless power supply in a DC power supply system, applied to power supply equipment, characterized in that, include: The device emits a detection signal and identifies whether a mobile device exists within a preset area. The detection signal includes a first signal and a second signal. The first signal is an infrared signal, and the second signal is an ultrasonic signal. By adjusting the parameters of the ultrasonic signal, the propagation distance of the ultrasonic signal is made lower than the propagation distance of the first signal. The power supply device emits both the first signal and the second signal. Power is activated when the mobile device is detected; Wherein, when the detection signal received by the mobile device is the first signal, the mobile device is adjusted to move in the direction from which the first signal was emitted at a first speed; or, when the detection signal received by the mobile device includes both the first signal and the second signal, the mobile device is adjusted to move in the direction from which the first signal was emitted at a second speed; the first speed is greater than the second speed.

7. The method according to claim 6, characterized in that, Also includes: Receive battery level data from mobile devices; Power is cut off when the mobile device is fully charged.

8. A device for wireless power supply in a DC power supply system, comprising a processor and a memory storing program instructions, characterized in that, The processor is configured to, when executing the program instructions, perform the method for wireless power supply for a DC power supply system as described in any one of claims 1 to 7.

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