Wireless data transmission system and method in aircraft

Abstract

The invention discloses an aircraft internal wireless data transmission system and method, and the system comprises a multipath sensor signal collection module which collects an analog signal through a single-chip microcomputer integrated with an ADC, and converts the analog signal into a voltage signal through a conditioning circuit; the wireless communication module wirelessly transmits a signal and binds an independent IP identification type for the sensor through the wireless module and the pasted coaxial feed antenna; the video and telemetry data mixed transmission module is used for compressing the video by using an MPEG4 standard and embedding the telemetry data into a compressed video code stream DCT domain high-frequency unit; according to the electric energy and information integrated transmission module, through a bilateral LCC compensation topology magnetic coupling coil, the same coil synchronously transmits electric energy and information, the coil is subjected to forward modeling and reverse parameter optimization design, efficient integrated transmission is achieved, and the requirement for internal data transmission of the aircraft is met.

Description

Technical Field

[0001] This invention relates to the field of aircraft communication and data transmission technology, specifically to an internal wireless data transmission system and method for aircraft. Background Technology

[0002] In aircraft design and operation, real-time monitoring and transmission of various parameters are crucial for flight safety and test success. Currently, most aircraft sensors and main control units are connected via wires, transmitting data directly through analog signals. This method not only occupies a lot of space and increases the weight of the aircraft, leading to a reduced payload ratio, but is also susceptible to electromagnetic interference affecting signal quality, and the complexity of the wiring limits the flexibility of equipment layout.

[0003] Meanwhile, micro-aircraft need to transmit video images and telemetry data simultaneously. Traditionally, two independent channels are used for transmission, which leads to problems such as wasted channel resources and poor data synchronization. Video data is large in volume and has high real-time requirements, while telemetry data, although small in volume, is crucial for flight status monitoring. How to efficiently coordinate the transmission of these two types of data in a single channel has become a key challenge for improving communication efficiency.

[0004] Furthermore, the power supply and information transmission of electrical equipment inside aircraft have long relied on wired cable networks. The large number of cables increases the system's weight and makes integration difficult. In addition, the traditional separate design of wireless communication and wireless power transmission requires additional devices, further occupying space and introducing interference. In existing technologies, wireless transmission of power and information mostly uses independent coils or simple multiplexed channels, which suffer from problems such as coupling interference, low transmission efficiency, and poor stability, making it difficult to meet the requirements of aircraft for lightweight and high reliability.

[0005] Therefore, there is an urgent need for a technical solution that can integrate the acquisition of multiple sensor signals, the mixed transmission of video and telemetry data, and the integrated transmission of electrical energy and information, in order to solve the inherent defects of existing wired transmission within aircraft and improve system integration and operational efficiency. Summary of the Invention

[0006] In view of this, the purpose of this invention is to develop an internal wireless data transmission system for aircraft to solve the following problems:

[0007] I. The problem of complex internal cabling and low payload ratio in aircraft. Wireless transmission of multi-sensor information reduces cabling, improving the aircraft's payload ratio and the flexibility of sensor usage.

[0008] II. Achieving efficient transmission of video information and telemetry data on a single channel. By mixing video information and telemetry data into a single stream and transmitting it through a single channel, channel utilization is improved, and data transmission synchronization is guaranteed.

[0009] Third, it enables integrated wireless transmission of electrical energy and information. This allows the system to transmit power and information simultaneously, reducing the number of cables, lowering system weight, improving system reliability and integration, and meeting the requirements for lightweight aircraft and rapid integrated launch.

[0010] The aircraft internal wireless data transmission system of the present invention includes:

[0011] The multi-channel sensor signal acquisition module uses a microcontroller with an integrated ADC to acquire analog signals from multiple sensors inside the aircraft. The analog signals are converted into voltage signals by a conditioning circuit.

[0012] The wireless communication module includes a wireless module and an adhesive coaxial feed antenna. The wireless module is connected to a microcontroller and is used to transmit the collected sensor signals wirelessly. It can also bind independent IP addresses to different sensors to identify the sensor type.

[0013] The video and telemetry data hybrid transmission module uses the MPEG4 encoding standard to compress the video signal and embeds the telemetry data into the DCT domain high-frequency unit of the compressed video stream.

[0014] The integrated power and information transmission module adopts a magnetically coupled coil with a double-sided LCC compensation topology. It achieves synchronous transmission of power and information through the same set of transmitting and receiving coils. The coil adopts a design method that combines forward modeling and reverse parameter optimization. The ampere-turns of the primary coil are the same as those of the secondary coil.

[0015] Furthermore, in the multi-channel sensor signal acquisition module, the conditioning circuit includes two conditioning circuit chips. The input terminal of the first conditioning circuit chip is connected to the analog signal output terminal of each sensor, and is used to perform the first-stage follow-up processing on the input analog signal. The signal after the first-stage follow-up processing is divided by a voltage divider circuit. The divided signal is input to the second conditioning circuit chip for the second-stage follow-up processing. The output terminal of the second conditioning circuit chip is connected to the ADC input terminal of the microcontroller.

[0016] Furthermore, the microcontroller is connected to the ADC module via an internal DMA controller; the microcontroller's UART interface is connected to the wireless module's UART interface via a level conversion circuit.

[0017] Furthermore, in the structure of the wireless communication module, the wireless module includes a crystal clock circuit, with the two ends of the crystal grounded through capacitors, and the output terminal of the crystal connected to the clock input pin of the chip, providing a working clock source for the on-chip microprocessor subsystem and the WiFi network subsystem.

[0018] Furthermore, in the power supply circuit, capacitors are connected to the power supply pins of the wireless module's I / O ports, and capacitors are connected to the three DC-DC input pins inside the chip to maintain current stability.

[0019] Furthermore, the external antenna circuit is connected to the wireless module chip via an interface, which is connected to a glued coaxial feed antenna via a coaxial cable. The UART receive pin and transmit pin of the wireless module chip are connected to the UART transmit pin and receive pin of the microcontroller via current-limiting resistors, respectively, forming a bidirectional data transmission path. The wireless communication module also includes a reset circuit, which is composed of an RC circuit. The reset signal is connected to the reset pin of the wireless module chip to realize the automatic reset and manual reset functions of the module upon power-on.

[0020] Furthermore, the video and telemetry data hybrid transmission module includes: a video encoding unit, which adopts the simple-level coding framework of the MPEG4 standard and performs motion estimation and motion compensation on a macroblock basis; a telemetry data preprocessing unit, which converts telemetry data into a binary bitstream and performs verification processing on each bit; an embedding unit connecting the video encoding unit and the telemetry data preprocessing unit, which selects the unit corresponding to the last non-zero coefficient after Z-scan as the embedding position; a synchronization unit, which extracts the timestamp information from the output bitstream of the video encoding unit and matches it with the acquisition timestamp of the telemetry data to ensure that each frame of video image corresponds to one frame of telemetry data; and a bitstream compositing unit, which generates a composite bitstream by entropy encoding the unit sequence after embedding telemetry data, and transmits the composite bitstream to the wireless transmission circuit through the SPI interface of the wireless module.

[0021] Furthermore, the integrated power and information transmission module includes: a coupling mechanism comprising a primary coil and a secondary coil, the coils adopting a planar structure, an electromagnetic model constructed based on forward modeling, and iterative optimization of key coil parameters with transmission efficiency as the objective through inverse parameter optimization; a bilateral LCC compensation topology, wherein the primary compensation circuit parameters satisfy: The parameters of the secondary-side compensation circuit satisfy: To achieve constant voltage output; the communication circuit includes a transmitter series structure and a receiver processing circuit. The transmitter uses a single-pole double-throw switch to switch between forward and reverse communication. The circuit parameters include L. d1 \C d1 \L d2 \C d2 The signal processing circuit includes a communication load R, where R is the input impedance of the signal processing circuit; and an integrated wave blocking circuit, including a parallel resonant cavity and a series capacitor. The resonant cavity resonates above the communication frequency to prevent the signal from being transmitted to the energy loop, and the series capacitor is used to compensate for the additional inductive reactance generated by the resonant cavity.

[0022] This invention discloses a method for wireless data transmission inside an aircraft, comprising the following steps:

[0023] S1: Multi-channel sensor signal acquisition and transmission. The microcontroller acquires analog signals from various sensors. After the conditioning circuit composed of chips converts the 0-5V signal into a 0-3.3V signal, the microcontroller's internal ADC completes the A / D conversion. The converted data is buffered through DMA. When the buffered data reaches 1024 bytes, it is transmitted to the wireless module. The wireless module binds an independent IP address to each sensor and transmits the data through a glued coaxial feed antenna.

[0024] S2: Video and telemetry data are transmitted in a mixed manner. The video signal is encoded using the MPEG4 standard, and the telemetry data is converted into a binary bit stream. The least significant bit of the last unit after Z-scanning in the encoded video bit stream is embedded. During embedding, it is ensured that the level value of the unit is greater than 0 and is not 0 after embedding. After forming a composite bit stream, it is sent through the wireless communication module.

[0025] S3: Integrated transmission of electrical energy and information. Electrical energy and data from steps S1 and S2 above are transmitted simultaneously through magnetically coupled coils with a bilateral LCC compensated topology. The primary coil transmits electrical energy at a frequency of 100kHz, and the information signal is modulated at a frequency of 900kHz and loaded onto the same coil. The secondary coil receives the signal and separates the electrical energy and information signal. The electrical energy is rectified and regulated to power the device, and the information signal is demodulated to restore the original data.

[0026] The beneficial effects of this invention are:

[0027] 1. Effectively solves the problem of complex internal wiring in aircraft, improving payload ratio. This patent uses wireless transmission to transmit information from multiple sensors, reducing a large amount of wiring, simplifying the internal wiring of the aircraft, saving space, and reducing the weight of the aircraft. This effectively improves the payload ratio of the aircraft and enhances the flexibility of sensor use, freeing the internal layout of the aircraft from wiring limitations.

[0028] 2. Achieving efficient collaborative transmission of video information and telemetry data, improving channel utilization. This patent uses a single channel to transmit video information and telemetry data simultaneously, avoiding waste of channel resources. By embedding telemetry data into the high-frequency portion of the video stream and considering the characteristics of human vision, stable transmission of both types of data is achieved while ensuring good visual effects in the video image, thus improving transmission efficiency and data synchronization.

[0029] 3. Achieving integrated wireless transmission of electrical energy and information enhances system reliability and integration. This patent enables synchronous wireless transmission of electrical energy and information, reducing the use of power and communication cables, lowering system weight, and simplifying the aircraft's internal structure. Simultaneously, the integrated design reduces the need for additional communication devices, lowers electromagnetic interference, and improves system reliability and integration, meeting the requirements for lightweight aircraft and rapid integrated launch. Attached Figure Description

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0031] Figure 1 This is a schematic diagram of the structure of a multi-channel sensor signal acquisition and wireless transmission module;

[0032] Figure 2 This is a schematic diagram of the communication principle of an integrated power and information transmission system. Detailed Implementation

[0033] like Figure 1 , 2 As shown, the aircraft's internal wireless data transmission system in this embodiment includes:

[0034] The multi-channel sensor signal acquisition module employs a microcontroller with an integrated ADC to acquire analog signals from multiple sensors within the aircraft. These analog signals are converted into voltage signals by a conditioning circuit. The conditioning circuit within the module includes two conditioning circuit chips. The input of the first chip is connected to the analog signal output of each sensor, performing a first-stage follow-up processing on the input analog signals. The processed signal is then divided by a voltage divider circuit. The divided signal is input to the second conditioning chip for a second-stage follow-up processing. The output of the second chip is connected to the ADC input of the microcontroller. The microcontroller is connected to the ADC module via an internal DMA controller. The microcontroller's UART interface is connected to the UART interface of the wireless module via a level conversion circuit. In this embodiment, the multi-channel sensor signal acquisition module is based on the STM32F103 series microcontroller with an integrated ADC. First, the 0-5V analog signal output by the sensor is converted into a 0-3.3V adaptive signal through a conditioning circuit composed of an AD824 chip. Then, the microcontroller cyclically acquires the 8-channel signal and uses DMA to buffer the data, which is then transmitted to the CC3200 wireless module via UART. The adhesive coaxial feed antenna is used to enhance the signal. It can identify the types of sensors and connect sensors with high-speed transmission requirements to a low-interference network. The host computer can clearly identify the sensor type through the IP address. The integration and reliability are superior to similar products on the market, effectively reducing wiring complexity and improving the payload ratio of the aircraft.

[0035] The wireless communication module includes a wireless module and an adhesive coaxial feed antenna. The wireless module is connected to a microcontroller and is used to transmit the collected sensor signals wirelessly. It can also bind independent IP addresses to different sensors to identify the sensor type. The wireless communication module includes a crystal clock circuit. The two ends of the crystal are grounded through capacitors, and the output of the crystal is connected to the clock input pin of the chip, providing a clock source for the on-chip microprocessor subsystem and the WiFi network subsystem. In the power supply circuit, capacitors are connected to the power supply pins of the wireless module's I / O ports, and capacitors are connected to the three DC-DC input pins inside the chip to maintain current stability. The external antenna circuit is connected to the wireless module chip via an interface using a coaxial cable connected to the adhesive coaxial feed antenna. The UART receive and transmit pins of the wireless module chip are connected to the UART transmit and receive pins of the microcontroller through current-limiting resistors, forming a bidirectional data transmission path. The wireless communication module also includes a reset circuit, which is composed of an RC circuit. The reset signal is connected to the reset pin of the wireless module chip to realize the automatic reset and manual reset functions of the module upon power-on. The wireless communication module is based on the CC3200, whose 40MHz crystal oscillator provides the clock for the microprocessor and WiFi subsystem. The power supply pin stabilizes the current and bypasses high-frequency noise through capacitors. An external adhesive coaxial feed antenna enhances the signal transmission capability. It receives sensor data transmitted by STM32F103 and composite video and telemetry data through the UART interface. It creates multiple sockets based on the TCP protocol to realize multi-terminal connection and binds independent IP addresses to different sensors to identify their type.

[0036] The video and telemetry data hybrid transmission module uses the MPEG4 encoding standard to compress the video signal and embeds the telemetry data into the high-frequency units of the DCT domain of the compressed video stream. The module includes: a video encoding unit using the MPEG4 standard's simple-level coding framework, performing motion estimation and motion compensation on a macroblock basis; a telemetry data preprocessing unit, used to convert telemetry data into a binary bitstream and perform verification processing on each bit; an embedding unit connecting the video encoding unit and the telemetry data preprocessing unit, selecting the unit corresponding to the last non-zero coefficient after Z-scanning as the embedding position; a synchronization unit, used to extract the timestamp information from the output bitstream of the video encoding unit and match it with the acquisition timestamp of the telemetry data to ensure that each frame of video image corresponds to one frame of telemetry data; and a bitstream compositing unit, which generates a composite bitstream from the unit sequence after embedding the telemetry data through entropy encoding, and the composite bitstream is transmitted to the wireless transmission circuit through the SPI interface of the wireless module. Based on the human eye's greater sensitivity to low-frequency components in video, the hybrid video and telemetry data transmission module uses the MPEG4 standard to compress and encode the video signal. After converting the telemetry data into a binary bitstream, the least significant bit of the last high-frequency unit in the 8×8 block of Z-scanned data in the compressed bitstream is embedded. During embedding, the level value is ensured to be non-zero and remain valid after embedding. This module can achieve two types of data transmission on a single channel, with a high average peak signal-to-noise ratio, good video visual effects, and complete recovery of telemetry data. It avoids the resource waste of independent channel transmission and is suitable for the data transmission needs of micro-aircraft.

[0037] The integrated power and information transmission module employs a magnetically coupled coil with a bilateral LCC compensation topology. It achieves synchronous power and information transmission through the same set of transmitting and receiving coils. The coils utilize a design method combining forward modeling and inverse parameter optimization, with the primary coil having the same ampere-turns as the secondary coil. The integrated power and information transmission module includes: a coupling mechanism comprising a primary coil and a secondary coil, the coils employing a planar structure; an electromagnetic model constructed based on forward modeling; and iterative optimization of key coil parameters with transmission efficiency as the objective through inverse parameter optimization; a bilateral LCC compensation topology, with primary compensation circuit parameters satisfying the following: The parameters of the secondary-side compensation circuit satisfy: To achieve constant voltage output; the communication circuit includes a transmitter series structure and a receiver processing circuit. The transmitter uses a single-pole double-throw switch to switch between forward and reverse communication. The circuit parameters include L. d1 \C d1 \L d2 \C d2The communication load R is included, where R is the input impedance of the signal processing circuit. An integrated wave-blocking circuit is also included, comprising a parallel resonant cavity and a series capacitor. The resonant cavity resonates above the communication frequency to prevent signal transmission to the energy loop, and the series capacitor compensates for the additional inductive reactance generated by the resonant cavity. In this embodiment, the integrated power and information transmission module uses a magnetically coupled coil with a bilateral LCC-compensated topology. The information signal is modulated at 900kHz and transmitted through the same coil as the power signal. The wave-blocking circuit separates the energy and signal channels. This design, through forward modeling and reverse parameter optimization of the coupling mechanism, enables a 30A ampere-turns coil to simultaneously transmit information while transmitting 600W of power, solving the multi-coil interference problem, improving transmission efficiency and signal-to-noise ratio, effectively reducing the weight of aircraft cables, and meeting the requirements for cableless integration.

[0038] This invention discloses a method for wireless data transmission inside an aircraft, comprising the following steps:

[0039] S1: Multi-channel sensor signal acquisition and transmission. The microcontroller acquires analog signals from various sensors. After the conditioning circuit composed of chips converts the 0-5V signal into a 0-3.3V signal, the microcontroller's internal ADC completes the A / D conversion. The converted data is buffered through DMA. When the buffered data reaches 1024 bytes, it is transmitted to the wireless module. The wireless module binds an independent IP address to each sensor and transmits the data through a glued coaxial feed antenna.

[0040] S2: Video and telemetry data are transmitted in a mixed manner. The video signal is encoded using the MPEG4 standard, and the telemetry data is converted into a binary bit stream. The least significant bit of the last unit after Z-scanning in the encoded video bit stream is embedded. During embedding, it is ensured that the level value of the unit is greater than 0 and is not 0 after embedding. After forming a composite bit stream, it is sent through the wireless communication module.

[0041] S3: Integrated transmission of electrical energy and information. Electrical energy and data from steps S1 and S2 above are transmitted simultaneously through magnetically coupled coils with a bilateral LCC compensated topology. The primary coil transmits electrical energy at a frequency of 100kHz, and the information signal is modulated at a frequency of 900kHz and loaded onto the same coil. The secondary coil receives the signal and separates the electrical energy and information signal. The electrical energy is rectified and regulated to power the device, and the information signal is demodulated to restore the original data.

[0042] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations; any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the protection scope of the present invention.

Claims

1. A wireless data transmission system for an aircraft, characterized in that, include: The multi-channel sensor signal acquisition module uses a microcontroller with an integrated ADC to acquire analog signals from multiple sensors inside the aircraft. The analog signals are converted into voltage signals by a conditioning circuit. The wireless communication module includes a wireless module and an adhesive coaxial feed antenna. The wireless module is connected to a microcontroller and is used to transmit the collected sensor signals wirelessly. It can also bind independent IP addresses to different sensors to identify the sensor type. The video and telemetry data hybrid transmission module uses the MPEG4 encoding standard to compress the video signal and embeds the telemetry data into the DCT domain high-frequency unit of the compressed video stream. The integrated power and information transmission module adopts a magnetically coupled coil with a bilateral LCC compensation topology. It achieves synchronous transmission of power and information through the same set of transmitting and receiving coils. The coil adopts a design method that combines forward modeling and reverse parameter optimization.

2. The aircraft internal wireless data transmission system according to claim 1, characterized in that: In the multi-channel sensor signal acquisition module, the conditioning circuit includes two conditioning circuit chips. The input terminal of the first conditioning circuit chip is connected to the analog signal output terminal of each sensor, and is used to perform the first-stage follow-up processing on the input analog signal. The signal after the first-stage follow-up processing is divided by a voltage divider circuit. The divided signal is input to the second conditioning circuit chip for the second-stage follow-up processing. The output terminal of the second conditioning circuit chip is connected to the ADC input terminal of the microcontroller.

3. The aircraft internal wireless data transmission system according to claim 2, characterized in that: The microcontroller is connected to the ADC module via an internal DMA controller; the microcontroller's UART interface is connected to the wireless module's UART interface via a level conversion circuit.

4. The aircraft internal wireless data transmission system according to claim 1, characterized in that: In the structure of the wireless communication module, the wireless module includes a crystal clock circuit. The two ends of the crystal are grounded through capacitors, and the output of the crystal is connected to the clock input pin of the chip to provide a working clock source for the on-chip microprocessor subsystem and the WiFi network subsystem.

5. The aircraft internal wireless data transmission system according to claim 4, characterized in that: In the power supply circuit, capacitors are connected to the power supply pins of the I / O ports of the wireless module, and capacitors are connected to the three DC-DC input pins inside the chip to maintain current stability.

6. The aircraft internal wireless data transmission system according to claim 4, characterized in that: The external antenna circuit is connected to the wireless module chip via an interface, which is connected to a glued coaxial feed antenna via a coaxial cable. The UART receive pin and transmit pin of the wireless module chip are connected to the UART transmit pin and receive pin of the microcontroller via current-limiting resistors, respectively, forming a bidirectional data transmission path. The wireless communication module also includes a reset circuit, which is composed of an RC circuit. The reset signal is connected to the reset pin of the wireless module chip to realize the automatic reset and manual reset functions of the module upon power-on.

7. The aircraft internal wireless data transmission system according to claim 1, characterized in that: The video and telemetry data hybrid transmission module includes: The video coding unit adopts the simple-level coding framework of the MPEG4 standard, and performs motion estimation and motion compensation on a macroblock basis. The telemetry data preprocessing unit is used to convert telemetry data into a binary bit stream and perform verification processing on each bit. The embedding unit connects the video coding unit and the telemetry data preprocessing unit, and selects the unit corresponding to the last non-zero coefficient after Z-scan as the embedding position. The synchronization unit is used to extract the timestamp information from the output bitstream of the video encoding unit and match it with the acquisition timestamp of the telemetry data to ensure that each frame of video image corresponds to a frame of telemetry data. The code stream compositing unit entropy-encodes the unit sequence embedded with telemetry data to generate a composite code stream, which is then transmitted to the wireless transmission circuit via the SPI interface of the wireless module.

8. The aircraft internal wireless data transmission system according to claim 1, characterized in that: The integrated power and information transmission module includes: The coupling mechanism includes a primary coil and a secondary coil. The coil adopts a planar structure. An electromagnetic model is constructed based on forward modeling. The key parameters of the coil are iteratively optimized with transmission efficiency as the goal through inverse parameter optimization. In the bilateral LCC compensation topology, the primary-side compensation circuit parameters satisfy: The parameters of the secondary-side compensation circuit satisfy: To achieve constant voltage output; The communication loop includes a transmitter in series and a receiver processing circuit. The transmitter uses a single-pole double-throw switch to switch between forward and reverse communication. The loop parameters include L. d1 \C d1 \L d2 \C d2 and the communication load R, where R is the input impedance of the signal processing circuit; The integrated wave-blocking circuit includes a parallel resonant cavity and a series capacitor. The resonant cavity resonates above the communication frequency to prevent the signal from being transmitted to the energy loop, and the series capacitor is used to compensate for the additional inductive reactance generated by the resonant cavity.

9. A method for wireless data transmission inside an aircraft, characterized in that, Includes the following steps: S1: Multi-channel sensor signal acquisition and transmission. The microcontroller acquires analog signals from various sensors. After the conditioning circuit composed of chips converts the 0-5V signal into a 0-3.3V signal, the microcontroller's internal ADC completes the A / D conversion. The converted data is buffered through DMA. When the buffered data reaches 1024 bytes, it is transmitted to the wireless module. The wireless module binds an independent IP address to each sensor and transmits the data through a glued coaxial feed antenna. S2: Video and telemetry data are transmitted in a mixed manner. The video signal is encoded using the MPEG4 standard, and the telemetry data is converted into a binary bit stream. The least significant bit of the last unit after Z-scanning in the encoded video bit stream is embedded. During embedding, it is ensured that the level value of the unit is greater than 0 and is not 0 after embedding. After forming a composite bit stream, it is sent through the wireless communication module. S3: Integrated transmission of electrical energy and information. Electrical energy and data from steps S1 and S2 above are transmitted simultaneously through magnetically coupled coils with a bilateral LCC compensated topology. The primary coil transmits electrical energy at a frequency of 100kHz, and the information signal is modulated at a frequency of 900kHz and loaded onto the same coil. The secondary coil receives the signal and separates the electrical energy and information signal. The electrical energy is rectified and regulated to power the device, and the information signal is demodulated to restore the original data.

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