Position detection device and mobile wireless power transfer system

Abstract

The application belongs to the field of electric energy transmission, and discloses a position detection device and a mobile wireless electric energy transmission system. The position detection device comprises a detection transmitting coil, a detection receiving coil, a direct-current alternating-current converter, an alternating-current direct-current converter and a voltage detector. The first output end of the direct-current alternating-current converter is connected with the first end of the detection transmitting coil, and the second output end is connected with the second end of the detection transmitting coil. The first end of the detection receiving coil is connected with the first input end of the alternating-current direct-current converter, and the second end of the detection receiving coil is connected with the second input end of the alternating-current direct-current converter. The output end of the alternating-current direct-current converter is connected with the voltage detector. The mobile wireless electric energy transmission system comprises a switching controller, an energy receiving coil, an energy receiving control circuit, a plurality of energy transmitting coils, an energy transmitting control circuit and a plurality of position detection devices. The position detection device can realize accurate detection of the position of a mobile terminal, and effectively improve the accuracy and reliability of the mobile wireless electric energy transmission system.

Description

Technical Field

[0001] This invention belongs to the field of power transmission and relates to a position detection device and a mobile wireless power transmission system. Background Technology

[0002] Magnetic-coupled resonant wireless power transfer systems have broad application prospects in mobile vehicles such as electric vehicles and inspection robots. Currently, such devices generally use contact charging, which is prone to damage to the charging interface and the insulation layer of the wires, making them difficult to cope with extreme weather and climate. Mobile wireless power transfer systems, however, achieve "charging while moving" by laying transmitting coils along the entire route. Therefore, they can increase the vehicle's range while reducing the size of the onboard battery, making them the most promising wireless power transfer method for electric vehicles. This significantly reduces the device's own battery capacity, lightens the equipment, and improves operating efficiency. Furthermore, with increased automation and intelligence, the device can autonomously locate power sources, further enhancing automation.

[0003] Currently, mobile wireless power transmission using segmented transmitting coils requires switching to the appropriate transmitting coil based on the vehicle's location. Based on the current research, the main schemes for detecting the real-time location of a vehicle are as follows: Scheme 1 uses sensors such as infrared, magnetoresistive, and radar to determine the vehicle's location; Scheme 2 uses the phase reversal of the current phase of the detection coil at a specific location to determine the location.

[0004] Scheme 1 heavily relies on the sensor's own accuracy and cannot achieve specific identification. Therefore, it is only suitable for enclosed scenarios, such as rail transit systems. In more open roads, the presence of various vehicles can easily obstruct the sensor, causing misjudgments, malfunctions of the transmitting coil, and system abnormalities. Scheme 2 is a more widely used vehicle detection scheme. This scheme requires two signal detection coils below the transmitting coil. The vehicle position is determined by detecting the phase of the current in the two signal detection coils; if the current phases are opposite, the vehicle's position is determined. However, the signal detection coils in this scheme are relatively large, making them difficult to manufacture. Furthermore, the implementation of this scheme requires complex signal processing circuits, including multi-stage filters and amplifiers, posing a significant challenge to debugging. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art, which is that the real-time position detection of vehicles is inaccurate and difficult to implement, and to provide a position detection device and a mobile wireless power transmission system.

[0006] To achieve the above objectives, the present invention employs the following technical solution:

[0007] In a first aspect, the present invention provides a position detection device, comprising a detection transmitting coil, a detection receiving coil, a DC-AC converter, an AC-DC converter, and a voltage detector;

[0008] The input terminal of the DC-AC converter is used to connect to a DC power supply, the first output terminal is connected to the first terminal of the detection and transmission coil, and the second output terminal is connected to the second terminal of the detection and transmission coil.

[0009] The first end of the detection receiving coil is connected to the first input terminal of the AC-DC converter, and the second end of the detection receiving coil is connected to the second input terminal of the AC-DC converter.

[0010] The output of the AC / DC converter is connected to a voltage detector.

[0011] Optionally, it may also include a first capacitor, a second capacitor, and a third capacitor;

[0012] The first output terminal is connected to the first end of the detection transmitting coil via a first capacitor; the second end of the detection receiving coil is connected to the second input terminal of the AC-DC converter via a second capacitor; and the output terminal of the AC-DC converter is connected to the voltage detector via a third capacitor.

[0013] Optionally, the DC-AC converter includes a fourth capacitor, a fifth capacitor, and a half-bridge inverter circuit; the input terminal of the half-bridge inverter circuit is connected to the first terminal of both the fourth and fifth capacitors; the second terminal of the fourth capacitor is connected to the second terminal of the fifth capacitor; the output terminal of the half-bridge inverter circuit is connected to the first terminal of the detection transmitting coil; the second terminals of both the fourth and fifth capacitors are connected to the second terminal of the detection receiving coil; the first terminals of both the fourth and fifth capacitors are used to connect to a DC power supply.

[0014] Optionally, the AC / DC converter is a first uncontrolled rectifier.

[0015] In a second aspect, a mobile wireless power transmission system is provided, comprising a switching controller, an energy receiving coil, an energy receiving control circuit, a plurality of energy transmitting coils, an energy transmitting control circuit, and a plurality of the aforementioned position detection devices.

[0016] Several position detection devices share a detection transmitting coil and a voltage detector. The detection transmitting coil, energy receiving coil, and energy receiving control circuit are all mounted on a mobile terminal. Several energy transmitting coils are alternately arranged with the detection receiving coils of several position detection devices. The energy transmitting control circuit is connected to several energy transmitting coils. The switching controller is connected to both the voltage detector and the energy transmitting control circuit.

[0017] The voltage detector is used to detect the voltage of each detection receiving coil, obtain the detection signal and send it to the switching controller. The switching controller is used to switch the working state of each energy emission coil according to the detection signal through the energy emission control circuit.

[0018] Optionally, it also includes an energy storage battery, which is connected to an energy receiving coil via an energy receiving control circuit.

[0019] Optionally, the operating frequency of both the energy receiving coil and the energy transmitting coil is 85kHz, and the operating frequency of both the detection transmitting coil and the detection receiving coil is 620.5 to 1580kHz.

[0020] Optionally, the energy receiving coil is a double-layer coil.

[0021] Optionally, the energy receiving control circuit includes a sixth capacitor, a second uncontrolled rectifier, and a seventh capacitor;

[0022] The first terminal of the sixth capacitor is connected to the first terminal of the energy receiving coil, and the second terminal is connected to the first input terminal of the second uncontrolled rectifier; the second input terminal of the second uncontrolled rectifier is connected to the second terminal of the energy receiving coil.

[0023] The seventh capacitor is connected in parallel to the output of the second uncontrolled rectifier.

[0024] Optionally, the energy emission control circuit includes a third uncontrolled rectifier, an eighth capacitor, a full-bridge inverter, an inductor, a ninth capacitor, and a tenth capacitor.

[0025] The input terminal of the third uncontrolled rectifier and one end of the eighth capacitor are both used to connect to the energy source. The output terminal of the third uncontrolled rectifier is connected in parallel with the eighth capacitor and the full-bridge inverter. The first output terminal of the full-bridge inverter is connected in sequence to the inductor and the first end of the ninth capacitor. The second end of the ninth capacitor is connected to the first end of several energy emitting coils. The second output terminal of the full-bridge inverter is connected to the first end of the tenth capacitor and the second end of several energy emitting coils. The second end of the tenth capacitor is connected to the connecting line between the inductor and the first end of the ninth capacitor.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The position detection device of the present invention is based on the induction effect between the detection transmitting coil and the detection receiving coil, combined with the conversion of the AC-DC converter and the AC-DC converter, and finally detects the DC voltage at the output terminal of the AC-DC converter through a voltage detector, so as to realize the accurate detection of the real-time position of the detection transmitting coil relative to the detection receiving coil. In this way, it can accurately and effectively detect the real-time position of the object to be detected with the detection transmitting coil. Moreover, the structure is simple, does not require complex signal processing circuits, is easy to implement and has low cost.

[0028] This invention relates to a mobile wireless power transmission system. Based on the setup of several position detection devices, these devices share a single detection transmitting coil and a voltage detector, enabling accurate detection of the mobile terminal's position within the range of the detection receiving coil. Furthermore, by alternately arranging several energy transmitting coils and the detection receiving coils of the position detection devices, the operating state of each energy transmitting coil can be switched according to the induction results of the detection receiving coils, achieving stable energy transmission between the energy receiving coil and the energy transmitting coil. The alternating arrangement of the magnetic coupling mechanisms of the energy transmitting coil and the detection receiving coil helps reduce the mutual inductance between them, thereby minimizing the impact of energy transmission on position detection. Attached Figure Description

[0029] Figure 1 This is a topology diagram of the position detection device according to an embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram showing the arrangement of the detection receiving coil and the energy transmitting coil in an embodiment of the present invention;

[0031] Figure 3 This is a topology diagram of the energy transmission device according to an embodiment of the present invention.

[0032] Wherein: 1-Detection receiving coil; 2-Energy transmitting coil. Detailed Implementation

[0033] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0034] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0035] The present invention will now be described in further detail with reference to the accompanying drawings:

[0036] See Figure 1 In one embodiment of the present invention, a position detection device is provided, which can be applied to electric vehicles to achieve accurate detection of the position of electric vehicles, and then switch to the corresponding energy transmitting coil 2 according to the position of electric vehicles, thereby effectively improving the accuracy and reliability of mobile wireless power transmission systems.

[0037] Specifically, the position detection device includes a detection transmitting coil, a detection receiving coil, a DC-AC converter, an AC-DC converter, and a voltage detector; the input terminal of the DC-AC converter is used to connect to a DC power supply, the first output terminal is connected to the first terminal of the detection transmitting coil, and the second output terminal is connected to the second terminal of the detection transmitting coil; the first terminal of the detection receiving coil is connected to the first input terminal of the AC-DC converter, and the second terminal of the detection receiving coil is connected to the second input terminal of the AC-DC converter; the output terminal of the AC-DC converter is connected to the voltage detector.

[0038] In practice, the detection transmitting coil is mounted on the electric vehicle. In this embodiment, the electric vehicle is used as the object to be detected. The detection receiving coil 1 is set on a designated area on the ground.

[0039] The input of the DC-AC converter can be connected to the on-board battery of an electric vehicle, which provides DC power. This DC power is then converted into high-frequency AC power by the DC-AC converter. When the detection transmitting coil moves into the coupling area of ​​the detection receiving coil 1, the detection receiving coil 1 senses the high-frequency AC power from the detection transmitting coil and converts it into DC power through the AC-DC converter. The DC voltage is then detected by a voltage detector and compared with a preset reference voltage. This reference voltage can be the measured voltage at the output of the AC-DC converter when the detection transmitting coil moves outside the coupling area of ​​the detection receiving coil 1.

[0040] Therefore, based on the induction phenomenon between the detection transmitting coil and the detection receiving coil 1, when the current DC voltage is greater than the reference voltage, it indicates that the detection transmitting coil has moved into the coupling area of ​​the detection receiving coil 1, that is, the electric vehicle has moved into the coupling area of ​​the detection receiving coil 1, thus realizing the real-time position detection of the electric vehicle.

[0041] The position detection device of the present invention is based on the induction effect between the detection transmitting coil and the detection receiving coil 1, combined with the conversion of the AC-DC converter and the AC-DC converter, and finally detects the DC voltage at the output terminal of the AC-DC converter through a voltage detector, so as to realize the accurate detection of the real-time position of the detection transmitting coil relative to the detection receiving coil 1. Thus, it can accurately and effectively detect the real-time position of the object to be detected that is equipped with the detection transmitting coil. Moreover, the structure is simple, does not require complex signal processing circuits, is easy to implement and has low cost.

[0042] In one possible implementation, the position detection device further includes a first capacitor C1, a second capacitor C2, and a third capacitor C3; the first output terminal is connected to the first end of the detection transmitting coil via the first capacitor C1; the second end of the detection receiving coil 1 is connected to the second input terminal of the AC-DC converter via the second capacitor C2; and the output terminal of the AC-DC converter is connected to the voltage detector via the third capacitor C3.

[0043] Specifically, the first capacitor C1, the second capacitor C2, and the self-inductance L of the detection transmitting coil... P And the self-inductance L of the receiving coil 1 is detected. S An SS-type resonant compensation circuit is used for resonant compensation, consisting of the first capacitor C1 and the self-inductance L of the detection and transmitting coil. P As a transmitter resonance compensation circuit, the second capacitor C2 and the self-inductance L of the detection receiving coil 1 S This serves as a resonant compensation circuit at the receiving end. Furthermore, since the transmission power required by the position detection device is not very high, using an SS-type resonant compensation circuit can simplify the structure of the position detection device to some extent, further reducing design difficulty and cost. The third capacitor, C3, acts as a filter capacitor, performing a filtering function.

[0044] In one possible implementation, the DC-AC converter includes a fourth capacitor C4, a fifth capacitor C5, and a half-bridge inverter circuit; the input terminal of the half-bridge inverter circuit is connected to the first terminal of both the fourth capacitor C4 and the fifth capacitor C5; the second terminal of the fourth capacitor C4 is connected to the second terminal of the fifth capacitor; the output terminal of the half-bridge inverter circuit is connected to the first terminal of the detection transmitting coil; the second terminals of both the fourth capacitor C4 and the fifth capacitor C5 are connected to the second terminal of the detection receiving coil 1; the first terminals of both the fourth capacitor C4 and the fifth capacitor C5 are used to connect to a DC power supply.

[0045] Specifically, the fourth capacitor C4 and the fifth capacitor C5 are generally chosen to be relatively large, serving as filter capacitors like the third capacitor C3, and are connected in parallel to achieve a filtering effect. The half-bridge inverter circuit is composed of two MOSFETs VT1 and VT2 and two diodes VD1 and VD2, used to convert DC power into high-frequency AC power.

[0046] In one possible implementation, the AC / DC converter is a first uncontrolled rectifier. Specifically, the first uncontrolled rectifier is composed of four diodes, VD3, VD4, VD5, and VD6, used to convert the high-frequency AC current induced by the detection receiving coil 1 into DC current.

[0047] See Figure 2 and 3 In another embodiment of the present invention, a mobile wireless power transmission system is provided, including a switching controller, an energy receiving coil, an energy receiving control circuit, a plurality of energy transmitting coils 2, an energy transmitting control circuit, and a plurality of the aforementioned position detection devices. The plurality of position detection devices share a detection transmitting coil and a voltage detector. The detection transmitting coil, the energy receiving coil, and the energy receiving control circuit are all mounted on a mobile terminal. The plurality of energy transmitting coils 2 and the detection receiving coils 1 of the plurality of position detection devices are alternately arranged in sequence. The energy transmitting control circuit is connected to all the plurality of energy transmitting coils 2, and the switching controller is connected to both the voltage detector and the energy transmitting control circuit. The voltage detector is used to detect the voltage of each detection receiving coil 1, obtain a detection signal, and send it to the switching controller. The switching controller is used to switch the operating state of each energy transmitting coil 2 according to the detection signal via the energy transmitting control circuit.

[0048] Based on a sequential alternating arrangement of several energy transmitting coils 2 and several position detection receiving coils 1, the detection receiving coils 1 and energy transmitting coils 2 are designed separately. The detection receiving coil 1, as an independent coil, is arranged between two adjacent energy transmitting coils 2 or on one side of an edge energy transmitting coil 2. When the mobile terminal first enters the charging area, it is facing the first detection receiving coil 1, thus activating the first energy transmitting coil 2 and deactivating the remaining energy transmitting coils 2. As the mobile terminal moves further forward, the second detection receiving coil 1 senses the mobile terminal's position, deactivating the first and third energy transmitting coils 2 and activating the second energy transmitting coil 2. This process continues until the mobile terminal leaves the wireless charging area, thereby achieving mobile terminal position detection and mobile wireless charging.

[0049] This invention relates to a mobile wireless power transmission system. Based on the setup of several position detection devices, these devices share a single detection transmitting coil and a voltage detector, enabling accurate detection of the mobile terminal's position within the range of the detection receiving coil 1. Furthermore, by employing a method where several energy transmitting coils 2 and the detection receiving coils 1 of the position detection devices are alternately arranged, the operating state of each energy transmitting coil 2 can be switched according to the sensing results of the detection receiving coils 1, achieving stable energy transmission between the energy receiving coil and the energy transmitting coil 2. Moreover, the alternating arrangement of the magnetic coupling mechanisms of the energy transmitting coil 2 and the detection receiving coil 1 helps reduce the mutual inductance between them, thereby minimizing the impact of energy transmission on position detection.

[0050] In one possible implementation, the mobile wireless power transfer system further includes an energy storage battery connected to the energy receiving coil via an energy receiving control circuit. Specifically, by incorporating the energy storage battery, the energy sensed by the energy receiving coil can be effectively stored, eliminating the need for immediate consumption.

[0051] In one possible implementation, the operating frequencies of the energy receiving coil and the energy transmitting coil 2 are both 85 kHz, and the operating frequencies of the detection transmitting coil and the detection receiving coil 1 are both 620.5 to 1580 kHz, preferably 1000 kHz.

[0052] Specifically, since the energy receiving coil and energy transmitting coil 2, as well as the detection transmitting coil and detection receiving coil 1, are all operated through magnetic coupling, in order to minimize the mutual interference between them during operation, it is necessary to reasonably select the operating frequency of each coil. In this embodiment, the operating frequency of the energy receiving coil and energy transmitting coil 2 is 85kHz, and the operating frequency of the detection transmitting coil and detection receiving coil 1 is 620.5 to 1580kHz. Under this operating frequency setting, the mutual interference between them is significantly reduced.

[0053] In one possible implementation, the energy receiving coil is a double-layer coil. Specifically, since most mobile terminals have limited space, such as electric vehicle chassis, the energy receiving coil is designed as a double-layer coil to enhance its energy pickup capability.

[0054] In one possible implementation, the energy receiving control circuit includes a sixth capacitor C6, a second uncontrolled rectifier, and a seventh capacitor C7; the first end of the sixth capacitor C6 is connected to the first end of the energy receiving coil, and the second end is connected to the first input end of the second uncontrolled rectifier; the second input end of the second uncontrolled rectifier is connected to the second end of the energy receiving coil; and the seventh capacitor C7 is connected in parallel to the output end of the second uncontrolled rectifier.

[0055] Specifically, the second uncontrolled rectifier consists of four diodes VD 71 VD 81 VD 91 and VD 101 Together, they form a circuit used to convert the high-frequency alternating current induced by the energy receiving coil into direct current, which can then power the energy storage battery through the energy storage battery charging circuit. The sixth capacitor C6 and the self-inductance L of the energy receiving coil... S1 The receiving end resonant compensation circuit is formed, and the seventh capacitor C7 serves as a filter capacitor, mainly playing a filtering role.

[0056] In one possible implementation, the energy emission control circuit includes a third uncontrolled rectifier, an eighth capacitor C8, a full-bridge inverter, an inductor L1, a ninth capacitor C9, and a tenth capacitor C1. 10 The input terminal of the third uncontrolled rectifier and one end of the eighth capacitor C8 are both used to connect to the energy source. The output terminal of the third uncontrolled rectifier is connected in parallel with the eighth capacitor C8 and the full-bridge inverter. The first output terminal of the full-bridge inverter is connected in parallel with the inductor L1 and the first end of the ninth capacitor C9. The second end of the ninth capacitor C9 is connected to the first ends of several energy transmitting coils 2. The second output terminal of the full-bridge inverter is connected to the tenth capacitor C... 10 The first end and the second ends of several energy transmitting coils 2 are all connected; the tenth capacitor C 10 The second terminal is connected to the connection line between the inductor and the first terminal of the ninth capacitor C9.

[0057] Specifically, the energy transmission module input can be selected as single-phase power frequency AC U. i The third uncontrolled rectifier consists of four diodes VD 11 VD 21 VD 31 and VD 41 Together they form a single-phase power frequency AC U i The full-bridge inverter converts DC power to DC power and consists of four MOSFETs VT. 11 VT 21 VT 31 and VT 41 Together, they form a system that converts direct current into high-frequency alternating current. Inductor L1, ninth capacitor C9, and tenth capacitor C... 10 And the self-inductance L of energy transmitting coil 2 P1 The transmitter resonant compensation circuit is formed, and the eighth capacitor C8 serves as a filter capacitor, mainly playing a filtering role.

[0058] Among them, the transmitting end resonant compensation circuit of the energy transmission control circuit and the receiving end resonant compensation circuit of the energy receiving control circuit form an LCC-S structure resonant compensation circuit. Based on the large power of energy transmission, the LCC-S structure resonant compensation circuit can effectively maintain the constant transmitting end current.

[0059] In one possible implementation, the energy transmitting coil 2 is 80cm long and 40cm wide, and the radius of the energy receiving coil is 20cm. The specific parameters of the energy transmitting coil 2 and the energy receiving coil are shown in Table 1.

[0060] Table 1 Parameters of Energy Transmitting Coil 2 and Energy Receiving Coil

[0061] Parameter name transmitter coil Receiver coil Coil outer dimensions 80×40cm 20cm radius Coil internal dimensions 50×10cm Radius 10cm Number of turns 21 turns 10 turns Leeds Line Shares 1300 shares 2000 shares Lids line diameter 13mm 20mm Does it have a magnetic core? yes yes Self-awareness 361μH 53μH

[0062] Considering that the mobile terminal needs to simultaneously deploy an energy receiving coil and a detection transmitting coil, and that its space is limited, as well as that the transmission power of the detection transmitting coil is not large, the design of the detection transmitting coil is relatively simple. Its size is consistent with that of the energy receiving coil, and its outer size is a 20×20cm square coil. For specific parameters, please refer to Table 2.

[0063] Table 2 Parameter Table for Detection Transmitting Coil and Detection Receiving Coil 1

[0064] Parameter name transmitter coil Receiver coil Coil outer dimensions 20×20cm 20×40cm Coil internal dimensions 5×5cm 5×25cm Number of coil turns 10 turns 10 turns Leeds Line Shares 1000 shares 1000 shares Does it have a magnetic core? It is (shared). no

[0065] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A position detection device, characterized in that, This includes a detection transmitting coil, a detection receiving coil, a DC-AC converter, an AC-DC converter, and a voltage detector; The input terminal of the DC-AC converter is used to connect to a DC power supply, the first output terminal is connected to the first terminal of the detection and transmission coil, and the second output terminal is connected to the second terminal of the detection and transmission coil. The first end of the detection receiving coil is connected to the first input terminal of the AC-DC converter, and the second end of the detection receiving coil is connected to the second input terminal of the AC-DC converter. The output of the AC / DC converter is connected to a voltage detector; It also includes a first capacitor, a second capacitor, and a third capacitor; The first output terminal is connected to the first terminal of the detection transmitting coil via a first capacitor; the second terminal of the detection receiving coil is connected to the second input terminal of the AC-DC converter via a second capacitor; the output terminal of the AC-DC converter is connected to the voltage detector via a third capacitor. The DC-AC converter includes a fourth capacitor, a fifth capacitor, and a half-bridge inverter circuit; the input terminal of the half-bridge inverter circuit is connected to the first terminal of both the fourth and fifth capacitors; the second terminal of the fourth capacitor is connected to the second terminal of the fifth capacitor; the output terminal of the half-bridge inverter circuit is connected to the first terminal of the detection transmitting coil; the second terminals of both the fourth and fifth capacitors are connected to the second terminal of the detection receiving coil; the first terminals of both the fourth and fifth capacitors are used to connect to a DC power supply.

2. The position detection device according to claim 1, characterized in that, The AC / DC converter is the first uncontrolled rectifier.

3. A mobile wireless power transmission system, characterized in that, It includes a switching controller, an energy receiving coil, an energy receiving control circuit, several energy transmitting coils, an energy transmitting control circuit, and several position detection devices as described in any one of claims 1 to 2; Several position detection devices share a detection transmitting coil and a voltage detector. The detection transmitting coil, energy receiving coil, and energy receiving control circuit are all mounted on a mobile terminal. Several energy transmitting coils are alternately arranged with the detection receiving coils of several position detection devices. The energy transmitting control circuit is connected to several energy transmitting coils. The switching controller is connected to both the voltage detector and the energy transmitting control circuit. The voltage detector is used to detect the voltage of each detection receiving coil, obtain the detection signal and send it to the switching controller. The switching controller is used to switch the working state of each energy emission coil according to the detection signal through the energy emission control circuit.

4. The mobile wireless power transmission system according to claim 3, characterized in that, It also includes an energy storage battery, which is connected to an energy receiving coil via an energy receiving control circuit.

5. The mobile wireless power transmission system according to claim 3, characterized in that, The operating frequency of both the energy receiving coil and the energy transmitting coil is 85kHz, and the operating frequency of both the detection transmitting coil and the detection receiving coil is 620.5~1580kHz.

6. The mobile wireless power transmission system according to claim 3, characterized in that, The energy receiving coil is a double-layer coil.

7. The mobile wireless power transmission system according to claim 3, characterized in that, The energy receiving control circuit includes a sixth capacitor, a second uncontrolled rectifier, and a seventh capacitor. The first terminal of the sixth capacitor is connected to the first terminal of the energy receiving coil, and the second terminal is connected to the first input terminal of the second uncontrolled rectifier; the second input terminal of the second uncontrolled rectifier is connected to the second terminal of the energy receiving coil. The seventh capacitor is connected in parallel to the output of the second uncontrolled rectifier.

8. The mobile wireless power transmission system according to claim 3, characterized in that, The energy emission control circuit includes a third uncontrolled rectifier, an eighth capacitor, a full-bridge inverter, an inductor, a ninth capacitor, and a tenth capacitor. The input terminal of the third uncontrolled rectifier and one end of the eighth capacitor are both used to connect to the energy source. The output terminal of the third uncontrolled rectifier is connected in parallel with the eighth capacitor and the full-bridge inverter. The first output terminal of the full-bridge inverter is connected in sequence to the inductor and the first end of the ninth capacitor. The second end of the ninth capacitor is connected to the first end of several energy emitting coils. The second output terminal of the full-bridge inverter is connected to the first end of the tenth capacitor and the second end of several energy emitting coils. The second end of the tenth capacitor is connected to the connecting line between the inductor and the first end of the ninth capacitor.

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