A wireless driving system and method for an electric response camouflage net

Abstract

The present invention is applicable to the technical field of camouflage nets, and provides a wireless driving system and method for an electrically responsive camouflage net. The wireless driving method of the present invention realizes the individual control of each camouflage base component of the electrically responsive camouflage net, and the arrangement of the camouflage base components can be adjusted according to the changes in the camouflage scene. When a camouflage base component at a certain position fails, the device at that position can be replaced quickly and independently without the need to re-prepare the entire camouflage net; it helps the electrically responsive camouflage net to get rid of its dependence on power cords and wires, and improves the portability of the equipment; by adjusting the presence and size of the current in the transmitting coil to provide the required voltage for the camouflage base components, a more flexible driving voltage and richer control modes are provided for different camouflage base components. The present invention greatly simplifies the complexity of the electrical system on the camouflage net side, and effectively reduces the signal interference problem that may occur between the camouflage base components.

Description

Technical Field

[0001] The present invention belongs to the technical field of camouflage nets, and in particular relates to a wireless driving system and method for an electric response camouflage net. Background Art

[0002] In the modern battlefield environment with highly developed informatization, the capability of targeted military strikes has been significantly enhanced, and weapons and equipment are facing unprecedented risks of being detected and attacked. This "discover and destroy" combat mode forces the military science and technology field to continuously explore new methods to prevent the enemy from obtaining information about weapons and equipment. Adaptive camouflage technology changes the light wave characteristics of the target itself through active control methods to achieve integration with the background environment, making it difficult for the enemy's light detection equipment to detect, track, identify, and even attack, becoming a key way to improve the survivability of equipment.

[0003] Most adaptive camouflage nets use stimulus-responsive materials, and the most widely used response modes are thermal response, light response, and electrical response. Among them, the electrical response mode has great advantages because it can be easily combined with current semiconductor technology to achieve more precise control and is not affected by the external environment. However, electrical response camouflage devices (electrochromic devices, OLED, LCD, liquid crystal, etc.) require power supply to maintain the current optical state during operation. This not only leads to the problems of bulky size, complex structure, and poor portability of camouflage equipment in actual use, but also limits the further optimization of the camouflage effect due to the cumbersome layout and aging of the wires. To solve these problems, wireless drive technology came into being. It uses inductive coupling between coils to wirelessly transmit energy to camouflage components, thereby changing the optical state of the device and achieving precise, lightweight and flexible adaptive camouflage. There are three main existing wireless driving methods: one is to transmit the generation control instructions of the camouflage pattern through the distributed Lora wireless communication network, but a separate power supply is required; the second is to provide the working voltage for the camouflage device through a high-power wireless power transmission system, but the camouflage device cannot be controlled; the third is to power the wireless power transmission system and transmit the control instructions through wireless communication methods such as Bluetooth, but there are defects such as the complex circuit structure of the receiving system on the camouflage net side and the camouflage net cannot be changed after it is formed once. Therefore, a wireless driving system and method for an electrically responsive camouflage net are proposed. Summary of the invention

[0004] The object of the present invention is to provide a wireless driving system and method for an electrically responsive camouflage net, aiming to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A wireless driving method for an electrically responsive camouflage net comprises the following steps:

[0007] Step 1: Select a control method based on the resolution of the camouflage pattern;

[0008] When the resolution reaches or exceeds 10*10, a matrix determinant control method is used to control the target camouflage base components; when the resolution is lower than 10*10, the controller is used to independently control each transmitting coil to achieve control of the target camouflage base components;

[0009] Step 2: Input the data of the camouflage pattern into the controller, and the controller converts the data of the camouflage pattern into the working voltage signal required by the corresponding camouflage base component; the voltage signal output by the controller is input into the transmitting coil after D / A conversion, power amplification and parallel current sharing, driving the transmitting coil to generate a changing magnetic field; when the receiving coil enters the magnetic field range of the transmitting coil, according to Faraday's law of electromagnetic induction, an AC induced electromotive force is generated in the receiving coil; the AC induced electromotive force generated by the receiving coil is processed by the rectifier and filter circuit and input into both ends of the camouflage base component, so that the camouflage base component starts to work, and adaptive camouflage is realized;

[0010] The control method of the matrix determinant is as follows: the arrangement of the transmitting coils and the receiving coils corresponds to each other, the inner sides of each row of transmitting coils are connected, the outer sides of each column of transmitting coils are connected, and the leads of each row and column of transmitting coils are connected to the controller of the transmitting system; when it is necessary to control the transmitting coil located at the position (a, b), the controller adjusts the output level of the leads of the ath row and the bth column, so that the transmitting coil at the target position emits a magnetic field outward, thereby realizing the control of the camouflage base components at the position (a, b).

[0011] Furthermore, when controlling the camouflage base components in the ath row and bth column, the I / O of the ath row lead is controlled to output a high level, and the other rows output a low level, and the I / O of the bth column lead is controlled to output a low level, and the other columns output a high level.

[0012] Furthermore, when the transmission efficiency between the transmitting coil and the receiving coil is low and cannot drive the camouflage base components to work, ferrite is added to one side of the receiving coil and / or one side of the transmitting coil to gather magnetic flux and reduce leakage magnetic flux.

[0013] Furthermore, a ferrite is vertically placed between the transmitting coil and the receiving coil as a partition wall to reduce the propagation of the magnetic field in a non-vertical direction.

[0014] A wireless driving system for an electrically responsive camouflaged net, used to implement the wireless driving method for an electrically responsive camouflaged net as described above, comprising:

[0015] A transmitting system, comprising a controller, a D / A converter, a power amplifier, a parallel current sharing circuit, a transmitting coil and a diode; the output port of the controller is connected to the input end of the D / A converter, and the controller is used to convert the data of the camouflage pattern into the working voltage signal required by the corresponding camouflage base component; the output end of the D / A converter is connected to the input end of the power amplifier, and the D / A converter is used to perform D / A conversion on the voltage signal output by the controller to generate an analog voltage signal; the output end of the power amplifier is connected to the input end of the parallel current sharing circuit, and the power amplifier is used to amplify the analog voltage signal; the output end of the parallel current sharing circuit is respectively connected to one end of each transmitting coil, and the parallel current sharing circuit is used to evenly distribute the current; a diode is provided on one side of the transmitting coil, and the transmitting coil is used to emit a magnetic field outward; the diode is used to control the unidirectionality of the current in the transmitting coil;

[0016] The receiving coil is placed in the magnetic field range of the transmitting coil and is used to receive the magnetic field energy from the transmitting coil and generate AC induced electromotive force;

[0017] A rectifier and filter circuit, wherein the output end of the receiving coil is connected to the input end of the rectifier and filter circuit, and the output end of the rectifier and filter circuit is connected to the two ends of the camouflage base component. The rectifier and filter circuit is used to convert the AC induced electromotive force into DC power and input it to the two ends of the camouflage base component.

[0018] Furthermore, the camouflage base components include electrochromic devices, liquid crystal devices and OLED devices.

[0019] Furthermore, when the camouflage base component is transparent, an opaque substrate is provided at the bottom of the camouflage base component, a via is provided on the opaque substrate, and the receiving coil and the rectifying and filtering circuit are placed under the opaque substrate and connected to the camouflage base component through the via.

[0020] Furthermore, the transmitting system controls the voltage of the receiving coil by controlling the voltage in the transmitting coil according to the turns ratio of the transmitting coil to the receiving coil, or controls the voltage of the receiving coil by adjusting the transmitting voltage of the transmitting system.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The wireless driving method of the present invention realizes the individual control of each camouflage base component of the electric response camouflage net, so the arrangement of the camouflage base components is highly flexible and can be adjusted according to the changes in the camouflage scene. When a camouflage base component at a certain position fails, the present invention can quickly and independently replace the component at that position without the need to re-prepare the entire electric response camouflage net, thereby improving maintenance efficiency.

[0023] 2. The wireless driving method of the present invention helps the electrically responsive camouflage net to get rid of its dependence on physical connections such as power cords and wires, significantly improving the portability of the camouflage net device.

[0024] 3. The wireless driving method of the present invention provides the required voltage for the camouflage base components by adjusting the current in the transmitting coil and the size. This method can provide more flexible driving voltage and richer control modes for different camouflage base components. Compared with the control information processing and signal conditioning on the camouflage net side, the present invention greatly simplifies the complexity of the electrical system on the camouflage net side, and because the magnetic field propagation is directional, it effectively reduces the signal interference problem that may occur between the camouflage base components. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a functional block diagram of the system of the present invention.

[0026] Figure 2 It is a schematic diagram of wireless driving of the camouflage-based components in the present invention.

[0027] Figure 3 It is a schematic diagram of the cross-sectional structure of the wireless driver of the camouflage base component in the present invention.

[0028] Figure 4 Schematic diagram of a wireless driving system of a matrix-determinant arrangement of an electrically responsive camouflage net in the present invention.

[0029] Figure 5 This is the distribution diagram of magnetic flux lines in the YZ direction of the transmitting coil and the receiving coil in the present invention.

[0030] Figure 6 The figure is a distribution diagram of magnetic flux lines in the YZ direction of the transmitting coil and the receiving coil with ferrite in the present invention.

[0031] Figure 7 The figure is a distribution diagram of magnetic flux lines in the YZ direction of the transmitting coil with ferrite and the receiving coil with ferrite in the present invention.

[0032] Figure 8 The figure is a distribution diagram of magnetic flux lines in the YZ direction of the transmitting coil with ferrite and the receiving coil with ferrite in the present invention (a vertical ferrite partition exists between the transmitting coil and the receiving coil).

[0033] Fig. 9 The figure is a schematic diagram of the structure of the wireless driving system of the camouflage net with a high magnetic permeability partition wall in the present invention.

[0034] In the figure: camouflage base components 1, rectification and filtering circuit 2, receiving coil 3, partition wall 4, transmitting coil 5, diode 6. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0036] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0037] like Figure 1-4 As shown, a wireless driving method of an electric response camouflage net provided by an embodiment of the present invention includes the following steps:

[0038] Step 1: Generate a camouflage pattern that matches the pixel resolution of the camouflage net in a computer based on the environmental information detected by the spectrometer or other optical information sensors (e.g., if the camouflage net is composed of 10*10 camouflage basic components, the corresponding camouflage pattern resolution is 10*10).

[0039] Step 2: Select a control method based on the resolution of the camouflage pattern;

[0040] When the resolution reaches or exceeds 10*10, a matrix determinant control method is used to control the target camouflage base components; when the resolution is lower than 10*10, a method of independently controlling each transmitting coil 5 by a controller is selected to achieve control of the target camouflage base components;

[0041] Step 3, input the data of the camouflage pattern into the controller, and the controller converts the data of the camouflage pattern into the working voltage signal required by the corresponding camouflage base component 1; perform D / A conversion on the voltage signal output by the controller to generate an analog voltage signal, and amplify the analog voltage signal through the power amplifier to meet the driving current required by the transmitting coil. Use a parallel current sharing circuit to ensure that multiple transmitting coils can receive current evenly to avoid uneven current distribution. The voltage signal output by the controller is input into the transmitting coil 5 after D / A conversion, power amplification and parallel current sharing circuit, driving the transmitting coil to generate a changing magnetic field; when the receiving coil 3 enters the magnetic field range of the transmitting coil 5, according to Faraday's law of electromagnetic induction, an induced electromotive force is generated in the receiving coil 3; the induced electromotive force generated by the receiving coil 3 is processed by the rectifier and filter circuit 2 and input to both ends of the camouflage base component 1, so that the camouflage base component 1 starts to work and realizes adaptive camouflage;

[0042] The control method of the matrix determinant is as follows: the arrangement of the transmitting coil 5 and the receiving coil 3 are made corresponding, the inner side of each row of the transmitting coil 5 is connected, the outer side of each column of the transmitting coil 5 is connected, and the leads of each row and column of the transmitting coil 5 are connected to the controller of the transmitting system; when the transmitting coil 5 located at the position (a, b) needs to be controlled, the I / O of the lead of the ath row is controlled to output a high level, and the other rows are controlled to output a low level, and the I / O of the lead of the bth column is controlled to output a low level, and the other columns are controlled to output a high level, so that the transmitting coil 5 at the target position emits a magnetic field outward, and the control of the camouflage base component 1 at the position (a, b) is realized. For example, if the color of the device (2, 2) is to be controlled, it is only necessary to control the transmitting coil 5 located at (2, 2) to emit a magnetic field outward, and the output level of the second row and the second column is further controlled by the controller to realize the control of the target position.

[0043] Among them, when the transmission efficiency between the transmitting coil 5 and the receiving coil 3 is low and cannot drive the camouflage base component 1 to work, ferrite is added to one side of the receiving coil 3 and / or one side of the transmitting coil 5 to gather magnetic flux and reduce leakage magnetic flux. In addition, according to actual needs, a partition wall 4 made of high magnetic permeability material (such as ferrite, etc.) can be vertically placed between the transmitting coil 5 and the receiving coil 3 to reduce the propagation of the magnetic field in the non-vertical direction (optionally used in the transmitting coil 5 and the receiving coil 3).

[0044] like Figure 1-4 As shown, a wireless driving system of an electrically responsive camouflage net provided by an embodiment of the present invention is used to implement the wireless driving method described above, including:

[0045] The transmitting system includes a controller, a D / A converter, a power amplifier, a parallel current sharing circuit, a transmitting coil 5 and a diode 6;

[0046] The output port of the controller is connected to the input end of the D / A converter, and the controller is used to convert the data of the camouflage pattern into the working voltage signal required by the corresponding camouflage base component 1;

[0047] The output end of the D / A converter is connected to the input end of the power amplifier, and the D / A converter is used to perform D / A conversion on the voltage signal output by the controller to generate an analog voltage signal;

[0048] The output end of the power amplifier is connected to the input end of the parallel current sharing circuit, and the power amplifier is used to amplify the analog voltage signal;

[0049] The output end of the parallel current balancing circuit is respectively connected to one end of each transmitting coil 5, and the parallel current balancing circuit is used to evenly distribute the current;

[0050] A diode 6 is provided on one side of the transmitting coil 5 (a high magnetic permeability material, such as ferrite, may be added according to actual application requirements), and the transmitting coil 5 is used to emit a magnetic field outward;

[0051] The diode 6 is used to control the unidirectionality of the current in the transmitting coil 5;

[0052] The receiving coil 3 (a high magnetic permeability material such as ferrite may be added according to actual application requirements) is placed within the magnetic field range of the transmitting coil 5, and is used to receive the magnetic field energy from the transmitting coil 5 and generate an AC induced electromotive force;

[0053] The rectifier and filter circuit 2 (which may be a half-wave rectifier, a full-wave rectifier, a bridge rectifier or a voltage doubler rectifier) ​​has an output end of the receiving coil 3 connected to an input end of the rectifier and filter circuit 2, and an output end of the rectifier and filter circuit 2 connected to two ends of the camouflage base component 1. The rectifier and filter circuit 2 is used to convert the AC induced electromotive force into a DC power and input it to two ends of the camouflage base component 1.

[0054] The camouflage base component 1 includes an electrochromic device, a liquid crystal device, an OLED device, etc. When the camouflage base component is transparent, an opaque substrate is provided at the bottom of the camouflage base component, and a via is provided on the opaque substrate. The receiving coil 3 and the rectifying and filtering circuit 2 are placed under the opaque substrate and connected to the camouflage base component through the via.

[0055] The transmitting system controls the voltage of the receiving coil 3 by controlling the voltage in the transmitting coil 5 according to the turns ratio of the transmitting coil 5 to the receiving coil 3, or controls the voltage of the receiving coil 3 by adjusting the transmitting voltage of the transmitting system. Due to the directionality of the magnetic field distribution, it mainly propagates in the vertical direction, so it has no effect on other camouflage components 1 at adjacent positions, thereby avoiding signal crosstalk.

[0056] In the embodiment of the present invention, for a large-scale array-arranged electric response camouflage network, the arrangement of the camouflage base components is as follows: Figure 4 As shown, the structure of each camouflage base component is as follows Figure 2 As shown, the details are in Figure 4 Omitted in .

[0057] Example 1, take an electrochromic camouflage net with a resolution of 30*30 as an example for explanation. Electrochromism refers to a reversible change in the optical properties of a device after being electrically stimulated, such as a change in color or transmittance. For a transparent electrochromic device, when it is applied to an electrically responsive camouflage net, it is necessary to add an opaque substrate at the bottom thereof, and a via is provided on the opaque substrate. The receiving coil 3 and the rectifier filter circuit 2 are hidden under the opaque substrate and connected to the electrochromic device through the via. According to the camouflage scene, select one or several electrochromic devices that meet the color requirements and assemble them into a 30*30 electrochromic camouflage net.

[0058] Correspondingly, the arrangement position of the transmitting coil 5 is required to be aligned with the center of the receiving coil 3. According to the requirements of different electrochromic devices, the appropriate number of turns / diameter is selected for the transmitting coil 5, and the output voltage of the transmitting coil 5 is controlled to ensure that the induced electromotive force obtained by the receiving coil 3 is within the operating voltage range of the electrochromic device (greater than the opening voltage of the electrochromic device, less than its maximum operating voltage, to prevent breakdown of the device). The inner side of each row of transmitting coils 5 is connected, and the outer side of each column of transmitting coils 5 is connected, and then 30 row control leads and 30 column control leads are connected to the controller of the transmitting system. Taking the control of the electrochromic device of the 5th row and the 3rd column as an example, the I / O of the control lead of the 5th row outputs a high level, and the other rows output a low level, and the I / O of the control lead of the 3rd column outputs a low level, and the other columns output a high level. It can be ensured that the transmitting coil 5 at the target position works to emit a magnetic field outward, while the remaining transmitting coils 5 have no current and will not emit a magnetic field outward.

[0059] In addition, if the transmission efficiency between the transmitting coil 5 and the receiving coil 3 is low and the electrochromic device cannot be driven to work, ferrite or other high magnetic permeability materials can be added to the side of the receiving coil 3 and / or the side of the transmitting coil 5 to gather magnetic flux and reduce leakage magnetic flux. Figure 5-7 As shown. Although the main direction of magnetic field propagation is vertical, when the electrochromic devices are small and closely arranged, it is still possible that the receiving coils 3 at adjacent positions will obtain induced electromotive force, thereby causing the electrochromic devices at adjacent positions to change color and cause signal crosstalk. Therefore, according to actual needs, ferrite or other high magnetic permeability materials can be placed vertically between each group of transmitting coils 5 and receiving coils 3 as partition walls 4 to reduce the propagation of magnetic fields in non-vertical directions. The simulation results are shown in Figure 8 The schematic diagram of the structure of the wireless driving system of the camouflage net with the partition wall 4 is shown in FIG. Fig. 9 shown.

[0060] Embodiment 2, taking the electrochromic camouflage net with a resolution of 5*5 as an example for explanation. The connection between the receiving side electrochromic camouflage base component 1 and the receiving coil 3 is the same as that in embodiment 1. In this embodiment, the number of camouflage base components is small, and the controller can control the target camouflage base component by independently controlling the transmitting coil 5, without the need to use the matrix determinant control described in embodiment 1.

[0061] The electrochromic camouflage nets in Example 1 and Example 2 can be replaced with camouflage nets composed of other electrical response devices such as liquid crystal, electrowetting ink screen, OLED, etc.

[0062] When the resolution of the electrical response camouflage network is high, such as 1000*1000, which exceeds the number of I / O pins of a single controller, the control of a large-scale camouflage network can be achieved by increasing the number of controllers or adding I / O port expansion circuits.

[0063] The above are only preferred embodiments of the present invention. It should be pointed out that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention. These should also be regarded as the protection scope of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A wireless driving method for an electrically responsive camouflage net, characterized in that: The following steps are involved: Step 1: Select a control method based on the resolution of the camouflage pattern; When the resolution reaches or exceeds 10*10, a matrix determinant control method is used to control the target camouflage base components; when the resolution is lower than 10*10, the controller is used to independently control each transmitting coil to achieve control of the target camouflage base components; Step 2: Input the data of the camouflage pattern into the controller, and the controller converts the data of the camouflage pattern into the working voltage signal required by the corresponding camouflage base component; the voltage signal output by the controller is input into the transmitting coil after D / A conversion, power amplification and parallel current sharing, driving the transmitting coil to generate a changing magnetic field; when the receiving coil enters the magnetic field range of the transmitting coil, according to Faraday's law of electromagnetic induction, an AC induced electromotive force is generated in the receiving coil; the AC induced electromotive force generated by the receiving coil is processed by the rectifier and filter circuit and input into both ends of the camouflage base component, so that the camouflage base component starts to work, and adaptive camouflage is realized; The control method of the matrix determinant is as follows: the arrangement of the transmitting coils and the receiving coils corresponds to each other, the inner sides of each row of transmitting coils are connected, the outer sides of each column of transmitting coils are connected, and the leads of each row and column of transmitting coils are connected to the controller of the transmitting system; when it is necessary to control the transmitting coil located at the position (a, b), the controller adjusts the output level of the leads of the ath row and the bth column, so that the transmitting coil at the target position emits a magnetic field outward, thereby realizing the control of the camouflage base components at the position (a, b).

2. The wireless driving method of the electric response camouflage net according to claim 1, characterized in that: When controlling the camouflage base components in row a and column b, the I / O of the lead in row a is controlled to output high level, and the other rows output low level; the I / O of the lead in column b is controlled to output low level, and the other columns output high level.

3. The wireless driving method of the electric response camouflage net according to claim 1, characterized in that: When the transmission efficiency between the transmitting coil and the receiving coil is low and cannot drive the camouflage base components to work, ferrite is added to one side of the receiving coil and / or one side of the transmitting coil to gather magnetic flux and reduce leakage magnetic flux.

4. The wireless driving method of the electric response camouflage net according to claim 1, characterized in that: A ferrite is vertically placed between the transmitting coil and the receiving coil as a partition wall to reduce the propagation of the magnetic field in a non-vertical direction.

5. A wireless driving system for an electrically responsive camouflaged net, used to implement the wireless driving method for an electrically responsive camouflaged net according to any one of claims 1 to 4, characterized in that: include: A transmitting system, comprising a controller, a D / A converter, a power amplifier, a parallel current sharing circuit, a transmitting coil and a diode; the output port of the controller is connected to the input end of the D / A converter, and the controller is used to convert the data of the camouflage pattern into the working voltage signal required by the corresponding camouflage base component; the output end of the D / A converter is connected to the input end of the power amplifier, and the D / A converter is used to perform D / A conversion on the voltage signal output by the controller to generate an analog voltage signal; the output end of the power amplifier is connected to the input end of the parallel current sharing circuit, and the power amplifier is used to amplify the analog voltage signal; the output end of the parallel current sharing circuit is respectively connected to one end of each transmitting coil, and the parallel current sharing circuit is used to evenly distribute the current; a diode is provided on one side of the transmitting coil, and the transmitting coil is used to emit a magnetic field outward; the diode is used to control the unidirectionality of the current in the transmitting coil; The receiving coil is placed in the magnetic field range of the transmitting coil and is used to receive the magnetic field energy from the transmitting coil and generate AC induced electromotive force; A rectifier and filter circuit, wherein the output end of the receiving coil is connected to the input end of the rectifier and filter circuit, and the output end of the rectifier and filter circuit is connected to the two ends of the camouflage base component. The rectifier and filter circuit is used to convert the AC induced electromotive force into DC power and input it to the two ends of the camouflage base component.

6. The wireless driving system of the electric response camouflage net according to claim 5, characterized in that: The camouflage base components include electrochromic devices, liquid crystal devices and OLED devices.

7. The wireless driving system of the electric response camouflage net according to claim 6, characterized in that: When the camouflage base component is transparent, an opaque substrate is provided at the bottom of the camouflage base component, a via is provided on the opaque substrate, and the receiving coil and the rectifier filter circuit are placed under the opaque substrate and connected to the camouflage base component through the via.

8. The wireless driving system of the electric response camouflage net according to claim 5, characterized in that: The transmitting system controls the voltage of the receiving coil by controlling the voltage in the transmitting coil according to the turns ratio of the transmitting coil to the receiving coil, or controls the voltage of the receiving coil by adjusting the transmitting voltage of the transmitting system.

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