Synchronized Near-Field Bi-directional Wireless Data Transceiver

Abstract

The present invention relates to a synchronized short-range bidirectional wireless data transceiver that uses different communication methods for downlink and uplink data transmission. A device according to one embodiment of the present invention includes a synchronizer that generates a clock signal for synchronized data demodulation, a first communication modem that modulates downlink data in a transmission mode using a first communication method and demodulates a received signal in a reception mode using the first communication method using the clock signal, and a second communication modem that modulates uplink data in a transmission mode using a second communication method and demodulates a received signal in a reception mode using the clock signal, and can operate in either a transmission mode or a reception mode. Through this configuration, a bidirectional wireless data transceiver can be provided that effectively reduces self-interference while using a single inductive link and improves the reliability of data transmission through synchronized data recovery.

Description

Technology Field

[0001] The present invention relates to a short-range bidirectional wireless data transmission and reception device, and more specifically, to a synchronized short-range bidirectional wireless data transmission and reception device that transmits and receives data bidirectionally using different communication methods for downlink and uplink data transmission. Background Technology

[0003] Wireless Power and Data Transmission (WPDT) is essential for low-power systems such as wearables, IoT, and biomedical systems. These systems must be able to transmit and receive data while receiving power wirelessly. Wireless Power and Data Transmission (WPDT) systems can be broadly divided into half-duplex (HD) and full-duplex (FD) methods.

[0004] Half-Duplex (HD) is a method that transmits downlink and uplink data sequentially. While this method has the advantage of reducing self-interference (SI), it has the disadvantage of increasing system complexity and limiting real-time performance due to the need for additional memory for temporary data storage and communication protocols for time division.

[0005] Full-duplex (FD) is a method that transmits downlink and uplink data simultaneously. While this method provides real-time control and monitoring capabilities, it has the disadvantage of requiring additional antennas or coils to mitigate self-interference (SI) between downlink and uplink data transmissions. These additional antennas or coils contribute to an increase in system size and power consumption.

[0006] Kassiri et al. (IEEE Journal of Solid-State Circuits, vol. 51, no. 5, pp. 1274-1289, 2016) proposed an FD data telemetry method that minimizes SI by using an inductive link and an RF antenna and allocating different frequency bands to the downlink and uplink. By using the inductive link for power transmission and the RF antenna for data transmission, it was possible to transmit power and data simultaneously. However, there is a disadvantage in that power consumption increases and the system becomes more complex due to the addition of RF communication circuits.

[0007] Jing et al. (IEEE Transactions on Power Electronics, vol. 38, no. 4, pp. 5549-5560, 2023) proposed a method using an external LC network to separate power and data channels. This method is designed to reduce interference through frequency separation by connecting an LC network to the power transmission coil and the data transmission coil, respectively. However, the external LC network is disadvantageous for system miniaturization and lacks Synchronized Data Recovery (SynDR) functionality, making it difficult to mitigate SI and maintain data integrity.

[0008] Karimi et al. (IEEE Transactions on Biomedical Circuits and Systems, vol. 18, no. 3, pp. 636-647, 2024) proposed a method for implementing wireless power and data transmission using Amplitude Shift Keying (ASK) and Load Shift Keying (LSK). The ASK method transmits data by utilizing changes in the amplitude of power signals, while the LSK method transmits data by detecting changes in load. However, this method also has limitations in that it is difficult to ensure the reliability of data transmission due to a lack of SynDR functionality.

[0009] As such, existing WPDT systems have problems such as limited real-time performance in the case of HD methods, and increased system complexity and power consumption in the case of FD methods due to additional components or complex circuit configurations. In particular, to apply them to low-power systems, it is important to minimize power consumption and simplify the system. Furthermore, to enhance the reliability of data transmission, technology is required to effectively mitigate self-interference and maintain data integrity. Therefore, there is a growing need for a new wireless power and data transmission system that can effectively reduce self-interference while using a single inductive link and improve the reliability of data transmission through synchronized data recovery. The problem to be solved

[0011] The present invention aims to provide a new bidirectional wireless data transceiver that can effectively reduce self-interference while using a single inductive link and improve the reliability of data transmission through synchronized data recovery. means of solving the problem

[0013] A short-range bidirectional wireless data transmission and reception device according to one embodiment of the present invention comprises: a synchronizer that generates a clock signal for synchronized data demodulation of a first communication method and a second communication method; a first communication modem that uses the clock signal to modulate downlink data into the first communication method in a transmission mode and demodulates a received signal into the first communication method in a reception mode; and a second communication modem that uses the clock signal to modulate uplink data into the second communication method in a transmission mode and demodulates a received signal into the second communication method in a reception mode; wherein the device can operate in either the transmission mode or the reception mode.

[0014] According to an embodiment, the first communication modem may include a first modulator that is activated in a transmission mode and deactivated in a reception mode; and a first demodulator that is deactivated in a transmission mode and activated in a reception mode.

[0015] According to an embodiment, the first communication method may be an ODSK (Off-Duration Shift Keying) method.

[0016] According to an embodiment, the second communication modem may include a second modulator that is disabled in transmission mode and enabled in reception mode; and a second demodulator that is enabled in transmission mode and disabled in reception mode.

[0017] According to an embodiment, the second communication method may be an SP-LSK (Short-Pulse Load Shift Keying) method.

[0018] According to an embodiment, the first modulator can modulate transmission data in a first interval of one cycle of a clock signal in transmission mode.

[0019] According to an embodiment, the second modulator can modulate transmission data in a second interval of one cycle of the clock signal in a receiving mode.

[0020] According to an embodiment, the first section and the second section may be set so as not to overlap each other.

[0021] According to an embodiment, in the transmission mode, data of the first communication method can be transmitted superimposed on the power signal.

[0022] According to an embodiment, the synchronizer can prevent changes in the amplitude of the clock signal during data transmission of the second communication method in the receiving mode.

[0023] According to an embodiment, the synchronizer can prevent changes in the amplitude of the clock signal by fixing the reference voltage during data transmission of the second communication method in the receiving mode.

[0024] According to an embodiment, the device may further include a single coil that transmits data of a first communication method and receives data of a second communication method in a transmission mode.

[0025] According to an embodiment, the single coil can transmit data of a second communication method and receive data of a first communication method in a receiving mode. Effects of the invention

[0027] According to the present invention, a new bidirectional wireless data transmission and reception device can be provided that effectively reduces self-interference while using a single inductive link and improves the reliability of data transmission through synchronized data recovery. Brief explanation of the drawing

[0029] A brief description of each drawing is provided to help to better understand the drawings cited in the detailed description of the invention. FIG. 1 is a diagram illustrating an environment in which a bidirectional wireless data transmission and reception device according to one embodiment of the present invention is applied. FIG. 2 is a block diagram of a bidirectional wireless data transmission and reception device according to one embodiment of the present invention. FIG. 3 is a block diagram of a bidirectional wireless data transmission and reception device according to one embodiment of the present invention when it is in transmission mode. FIG. 4 is a block diagram of a bidirectional wireless data transmission and reception device according to an embodiment of the present invention when it is in reception mode. FIG. 5 is an example circuit diagram for explaining the switching operation of a transceiver according to one embodiment of the present invention. FIG. 6 is a diagram illustrating the signal flow of a bidirectional wireless data transmission and reception device according to an embodiment of the present invention. FIG. 7 is a diagram illustrating the operation to prevent changes in the amplitude of a clock signal when a bidirectional wireless data transmission and reception device according to one embodiment of the present invention is in reception mode. FIGS. 8 and 9 are drawings of data measurement waveforms transmitted and received according to an embodiment of the present invention. FIGS. 10 and FIGS. 11 are photographs of an experimental setup of a bidirectional wireless data transmission and reception device according to one embodiment of the present invention. FIG. 12 is a diagram comparing experimental results according to one embodiment of the present invention with experimental results according to the prior art. Specific details for implementing the invention

[0030] The technical concept of the present disclosure is subject to various modifications and may have various embodiments, and specific embodiments are illustrated in the drawings and described in detail. However, this is not intended to limit the technical concept of the present disclosure to specific embodiments, and it should be understood that it includes all modifications, equivalents, and substitutions that fall within the scope of the technical concept of the present disclosure.

[0031] In describing the technical concept of the present disclosure, detailed descriptions of related prior art are omitted if it is determined that such descriptions would unnecessarily obscure the essence of the technical concept of the present disclosure. Furthermore, numbers used in the description of the present invention (e.g., First, Second, etc.) are merely identification symbols to distinguish one component from another.

[0032] In addition, when a component is described in this document as being "connected" or "joined" with another component, it should be understood that the component may be directly connected or joined to the other component, but unless otherwise specifically stated, it may also be connected or joined through another component in between.

[0033] Additionally, terms such as “~part,” “~device,” and “~part” described herein refer to a unit that processes at least one function or operation, and this may be implemented as hardware such as a processor, microprocessor, microcontroller, CPU (Central Processing Unit), GPU (Graphics Processing Unit), APU (Accelerate Processor Unit), DSP (Digital Signal Processor), ASIC (Application Specific Integrated Circuit), FPGA (Field Programmable Gate Array), software, or a combination of hardware and software.

[0034] Furthermore, it is intended to clarify that the classification of the components in this document is merely based on the primary function each component is responsible for. That is, two or more components described below may be combined into a single component, or a single component may be divided into two or more components based on more subdivided functions. Additionally, each component described below may additionally perform some or all of the functions of other components in addition to its own primary function, and it goes without saying that some of the primary functions of each component may be exclusively performed by other components.

[0035] Hereinafter, various embodiments according to the technical concept of the present disclosure will be described in detail in turn.

[0037] FIG. 1 is a diagram illustrating a communication environment between various electronic devices to which a short-range bidirectional wireless data transmission and reception device according to one embodiment of the present invention can be applied.

[0038] Referring to FIG. 1, a communication environment (100) between various electronic devices to which a short-range bidirectional wireless data transmission and reception device according to one embodiment of the present invention can be applied is illustrated. The communication environment (100) represents the data and power transmission and reception connection relationships between electronic devices that can be connected through the short-range bidirectional wireless data transmission and reception device according to the present invention. The connection relationships are indicated by bidirectional arrows, which means that power and data can be transmitted and received in both directions.

[0039] Smart devices (10) are exemplarily represented as portable electronic devices such as smartphones, laptops, and tablet PCs. Bio-devices (120) are exemplarily represented as bio-devices such as electrocardiograms, blood glucose meters, and portable medical imaging devices. Wearable devices (130) are exemplarily represented as wearable devices such as smartwatches, smart shoes, smart gloves, smart lenses, smart clothing, and smart glasses.

[0040] When a short-range bidirectional wireless data transmission and reception device according to the present invention is applied, various types of electronic devices exemplified by a smart device (10), a bio-device (20), and a wearable device (30) can be wirelessly connected to each other to efficiently exchange power and data. For example, a smartphone (10) can wirelessly supply power to a blood glucose meter (20) and receive measured blood glucose data in real time. Additionally, the smartphone (10) can wirelessly supply power to a smartwatch (30) and receive user exercise information or heart rate data. Furthermore, an electrocardiogram meter (20) can be connected to a smartwatch (30) to transmit measured electrocardiogram data to the smartwatch (30), and the smartwatch (30) can transmit this data to the smartphone (10).

[0041] The operating mode of each device can be flexibly changed depending on the situation. For example, if the portable medical imaging device (20) needs to supply power to another device, it can operate in transmission mode (TX MODE), and if it needs to receive power from a smartphone (10), it can operate in reception mode (RX MODE). The selection of these operating modes may be performed by the user or may be automatically determined by the device or system.

[0042] The short-range bidirectional wireless data transmission and reception device according to the present invention enables bidirectional transmission and reception of power and data using a single coil, thereby providing an efficient and convenient wireless communication environment between various electronic devices. In particular, when applied to wearable / IoT and biomedical systems where low-power operation is important, it can be effective in reducing the size and complexity of the system and extending battery life. The configuration and operation of the short-range bidirectional wireless data transmission and reception device according to the present invention will be described in detail below.

[0044] FIG. 2 is a block diagram of a short-range bidirectional wireless data transmission and reception device according to an embodiment of the present invention.

[0045] Referring to FIG. 2, a short-range bidirectional wireless data transmission and reception device (200) according to one embodiment of the present invention may include a transceiver (TRANSCEIVER, 110), a first modem (1ST MODEM, 120, 130), a second modem (2ND MODEM, 140, 150), a synchronizer (TRX SYNCHRONIZER, 160), and an antenna (ANTENNA, 170).

[0046] The transceiver (110) is configured to combine the functions of a transmitter and a receiver and may include components such as an amplifier and a filter. In particular, the transceiver (110) according to one embodiment of the present invention may enable the bidirectional wireless data transmission and reception device (200) to operate in either a transmission mode or a reception mode through a provided switch.

[0047] The first modem (1ST MODEM) may include a first modulator (1st MODULATOR, 120) and a first demodulator (1st DEMODULATOR, 130). The first modulator (1st MODULATOR, 120) can modulate an input signal using a first communication method. DLin shown in FIG. 2 may represent a downlink data input, and CLK may represent a clock input. The first demodulator (1st DEMODULATOR, 130) can demodulate an input signal using the first communication method. DLout shown in FIG. 2 may represent the demodulated downlink data output.

[0048] The second modem (2nd MODEM) may include a second modulator (2nd MODULATOR, 150) and a second demodulator (2nd DEMODULATOR, 140). The second modulator (2nd MODULATOR, 150) can modulate the input signal into the second communication method. ULin shown in FIG. 2 may represent an uplink data input. The second demodulator (2nd DEMODULATOR, 140) can demodulate the input signal into the second communication method. ULout shown in FIG. 2 may represent the demodulated uplink data output, and VCLK may represent a clock signal input generated by the synchronizer (160).

[0049] A synchronizer (TRX SYNCHRONIZER, 160) can generate a clock signal for synchronized data transmission and reception of a first communication method and a second communication method. The synchronizer (160) can output the generated clock signal to a first modem and / or a second modem. The first modem and / or the second modem can modulate or demodulate a signal using the input clock signal.

[0050] An antenna (ANTENNA, 170) transmits or receives electromagnetic waves, and an antenna (170) according to one embodiment of the present invention may be composed of a single coil.

[0052] FIG. 3 is a block diagram of a bidirectional wireless data transmission and reception device according to one embodiment of the present invention when it is in transmission mode.

[0053] A switch (not shown) capable of determining a transmission mode and a reception mode may be formed inside the transceiver (110), and in the case of the embodiment of FIG. 3, the switch inside the transceiver (110) may be connected to the transmission mode.

[0054] Referring to FIG. 3, in transmission mode, the first modulator (120) may be activated and the first demodulator (130) may be deactivated. At the same time, the second modulator (150) may be deactivated and the second demodulator (140) may be activated. The lines shown in FIG. 3 represent signal flow within the bidirectional wireless data transmission and reception device (200), where a dotted line represents an activated downlink signal path and a dashed line represents an uplink signal path.

[0055] The first modulator (120) can modulate the downlink data (Dlin) using the first communication method based on the downlink data (DLin) and clock signal (CLK) input from the controller (not shown). The modulated downlink data signal can be input to the transceiver (110).

[0056] The transceiver (110) can amplify the input downlink data signal and control noise to radiate it outward through the antenna (170). At this time, the synchronizer (160) can generate a clock signal (VCLK) for transmission operation and provide it to the first modulator (120) and / or the transceiver (110).

[0057] Simultaneously with the transmission of the downlink data signal described above, the antenna (170) can receive an uplink data signal of the second communication method from an external source and output it to the transceiver (110). The transceiver (110) can remove noise from the received uplink data signal, amplify the noise-removed uplink data signal, and output it to the second demodulator (140). The second demodulator (140) can demodulate the input uplink data signal (the signal amplified after noise removal) and output uplink data (ULout). At this time, the clock signal (VCLK) generated by the synchronizer (160) can also be provided to the second demodulator (140) and used for synchronization of the demodulation operation.

[0058] As such, a short-range bidirectional wireless data transmission and reception device according to one embodiment of the present invention can transmit a signal of a first communication method and simultaneously receive a signal of a second communication method in a transmission mode.

[0060] FIG. 4 is a block diagram of a bidirectional wireless data transmission and reception device according to an embodiment of the present invention when it is in reception mode.

[0061] A switch (not shown) capable of determining a transmission mode and a reception mode may be formed inside the transceiver (110), and in the case of the embodiment of FIG. 4, the switch inside the transceiver (110) may be connected to the reception mode.

[0062] Referring to FIG. 4, in receiving mode, the first modulator (120) may be deactivated and the first demodulator (130) may be activated. At the same time, the second modulator (150) may be activated and the second demodulator (140) may be deactivated. The lines shown in FIG. 4 represent signal flow within the bidirectional wireless data transmission and reception device (200), where a dotted line represents a downlink signal path and a dashed line represents an activated uplink signal path.

[0063] The second modulator (150) can modulate the uplink data (ULin) into the second communication method based on the uplink data (ULin) input from the controller (not shown) and the clock signal (VCLK) generated by the synchronizer (160). The modulated uplink data signal can be input to the transceiver (110). The transceiver (110) can amplify the input uplink data signal and control noise to radiate it outward through the antenna (170). At this time, the synchronizer (160) can generate a clock signal (VCLK) for transmission operation and provide it to the second modulator (150) and / or the transceiver (110).

[0064] Simultaneously with the transmission of the uplink data signal described above, the antenna (170) can receive a downlink data signal of the first communication method from an external source and output it to the transceiver (110). The transceiver (110) can remove noise from the received downlink data signal, amplify the noise-removed downlink data signal, and output it to the first demodulator (130). The first demodulator (130) can demodulate the input downlink data signal (the signal amplified after noise removal) and output downlink data (DLout). At this time, the clock signal (VCLK) generated by the synchronizer (160) can also be provided to the first demodulator (130) and used for synchronization of the demodulation operation. Additionally, the transceiver (110) can output a power signal (Vout) received through the antenna (170).

[0065] As such, a short-range bidirectional wireless data transmission and reception device according to one embodiment of the present invention can transmit a signal of a second communication method in a receiving mode and simultaneously receive a signal and power of a first communication method.

[0066] A switch circuit capable of determining a transmission mode and a reception mode formed inside a transceiver (110) is exemplified in FIG. 5. Since the switch inside the transceiver (110) can be implemented in various forms, it is obvious that the example in FIG. 5 cannot limit the scope of the present invention.

[0067] Meanwhile, FIG. 5(c) is an example of a low-side buffer inside the transceiver (110) that can output voltage across the ends of the antenna (170) coil. This will be described later.

[0068] FIG. 6 is a diagram illustrating the signal flow of a bidirectional wireless data transmission and reception device according to an embodiment of the present invention.

[0069] Before referring to FIG. 6, examples of communication methods and clock signal application operations applied in one embodiment of the present invention will be described.

[0070] A first modem according to one embodiment of the present invention may be configured to modulate and demodulate a signal using the Off-Duration Shift Keying (ODSK) method. For example, the first modulator (120) may modulate input data using the ODSK method in accordance with a clock signal. Additionally, the first demodulator (130) may demodulate input data using the ODSK method in accordance with a clock signal. The Off-Duration Shift Keying (ODSK) method can transmit information by modulating the "off-duration" of a signal, and is a method of transmitting digital data by modulating the time during which the signal is off to a specific value. Since this method is already widely known to those skilled in the art, a detailed description thereof is omitted.

[0071] A second modem according to one embodiment of the present invention may be configured to modulate and demodulate a signal using the SP-LSK (Short-Pulse Load Shift Keying) method. For example, the second modulator (150) may modulate input data using the SP-LSK method in accordance with a clock signal. Additionally, the second demodulator (140) may demodulate input data according to the SP-LSK method in accordance with a clock signal. The SP-LSK method is a method of transmitting data by rapidly changing the impedance of the load on the receiver side so that this change is reflected on the transmitter side. Since this method is already widely known to those skilled in the art, a detailed description thereof is omitted.

[0072] In addition, the bidirectional wireless data transmission and reception device (200) according to the present invention can utilize a single clock signal cycle by dividing it into temporal parts. Specifically, within one cycle of the clock signal, a signal of the second communication method can be modulated and transmitted / received during the first time interval (hereinafter referred to as the 'first time interval'), and a signal of the first communication method can be modulated and transmitted / received during the second time interval (hereinafter referred to as the 'second time interval'). That is, in the first part of the clock signal, the bidirectional wireless data transmission and reception device (200) in receiving mode can perform modulation for signal transmission of the second communication method to transmit data or power (SP-LSK method), and in the second part, the bidirectional wireless data transmission and reception device (200) in transmitting mode can perform modulation for signal transmission of the first communication method to transmit data or power (ODSK method).

[0073] The time lengths of the first and second halves of the clock signal used in this embodiment can be appropriately set according to the purpose of use or the system environment. Through this method, the downlink signal and the uplink signal are independently modulated within a single clock cycle, thereby minimizing interference between the two signals and enabling the implementation of an efficient bidirectional data communication and power transmission system.

[0074] Now, referring to FIG. 6, the top section shows a bidirectional wireless data transceiver (WPSFDT IC, 300) in transmission mode and a bidirectional wireless data transceiver (WPSFDT IC, 400) in reception mode connected via a coil for wireless power transmission. FIG. 5 illustrates eight signal waveforms, which are described sequentially in the order in which they are illustrated as follows.

[0075] DLin @ TX (blue) is a downlink data signal modulated using the ODSK method, and it can be confirmed that it was modulated using the latter half of the clock cycle ('0' if off-duration is short, '1' if long).

[0076] ULin @ RX (green) is an uplink data signal input via SP-LSK, and can be confirmed to have been modulated using the first half of the clock cycle (if the voltage amplitude induced in the antenna (170) coil of the bidirectional wireless data transmission / reception device (300) in transmission mode is detected through the change in load impedance of the bidirectional wireless data transmission / reception device (400) in reception mode, it is '1', and if not detected, it is '0').

[0077] VUL (light green) may be a reference voltage for distinguishing uplink signals in a bidirectional wireless data transmission and reception device (300) in transmission mode. The bidirectional wireless data transmission and reception device (300) in transmission mode can demodulate data of '1' if a voltage exceeding VUL (light green) is induced in the antenna (170) coil, and '0' otherwise.

[0078] VCOIL @ TX (red) may be a voltage signal induced in the antenna (170) coil of the bidirectional wireless data transmission and reception device (300) in transmission mode. It can be confirmed that an amplitude change occurs due to the pulse (VUL) for uplink data transmission.

[0079] VCLKT @ TX (brown) is a clock signal generated in a bidirectional wireless data transmission and reception device (300) in transmission mode. It can be generated in a synchronizer (160) of a bidirectional wireless data transmission and reception device (300) in transmission mode and can be used for data transmission and reception synchronization of the bidirectional wireless data transmission and reception device (300).

[0080] ULout @ TX (green) is an uplink data signal demodulated in a bidirectional wireless data transceiver (300) in transmission mode. The bidirectional wireless data transceiver (300) in transmission mode can confirm that '1' is demodulated by the next clock signal after a voltage exceeding VUL (light green) is induced in the antenna (170) coil.

[0081] VCLKR @ RX (brown) is a clock signal generated by a bidirectional wireless data transmission and reception device (400) in receiving mode. It can be generated by a synchronizer (160) of a bidirectional wireless data transmission and reception device (400) in receiving mode and can be used for data transmission and reception synchronization of a bidirectional wireless data transmission and reception device (300).

[0082] VRAMP @ RX (black) is a ramp signal used for ODSK data demodulation in a bidirectional wireless data transceiver (400) in receiving mode. It can be charged during the off-duration of the VCLKR signal, and when a ramp signal exceeding a specific threshold (VDL, blue) is detected, data '1' can be detected.

[0083] DLout @ RX (blue) is a downlink data signal demodulated from a bidirectional wireless data transmission and reception device (400) in receiving mode.

[0084] Meanwhile, VENV (in red), which is superimposed on VCOIL @ TX, is the envelope signal of the input signal of the bidirectional wireless data transceiver (400) in receiving mode. It may be maintained at a specific level during the transmission of the uplink signal, SP-LSK signal (this will be described later). In addition, toff and 2toff are off-duration times representing '1' and '0' in ODSK modulation. toff can represent '1', and 2toff can represent '0'.

[0085] As illustrated in FIG. 6, downlink data (DLin) transmitted from a bidirectional wireless data transmission and reception device (300) in transmission mode is modulated in an ODSK manner and transmitted through a coil, and can be demodulated in a bidirectional wireless data transmission and reception device (400) in reception mode to generate a DLout signal.

[0086] At the same time, the bidirectional wireless data transmission and reception device (400) in the receiving mode can modulate and transmit uplink data (ULin) using the SP-LSK method, and the bidirectional wireless data transmission and reception device (300) in the transmitting mode can demodulate it to generate a ULout signal. At this time, the synchronizer (160) of the bidirectional wireless data transmission and reception device (400) in the receiving mode can prevent changes in the amplitude of the clock signal by fixing the internal reference voltage when transmitting data using the SP-LSK method in order to effectively block interference caused by SP-LSK signal transmission and enable stable ODSK data demodulation.

[0087] When a bidirectional wireless data transmission and reception device (400) (hereinafter abbreviated as "transmitter") in receiving mode receives data in the ODSK method from a bidirectional wireless data transmission and reception device (300) (hereinafter abbreviated as "receiver") in transmitting mode, if the receiver (400) simultaneously transmits data to the transmitter (300) in the SP-LSK method, instantaneous fluctuations may occur in the power transmitted from the transmitter (300) to the receiver (400). Due to these fluctuations, the clock signal (VCLKR) generated by the synchronizer (160) of the receiver (400) may become unstable, and consequently, an error may occur in which the receiver (400) fails to properly read the ODSK signal. To prevent this, the receiver (400) may perform an operation to fix the envelope of the synchronizer (160) of the receiver (400) while transmitting SP-LSK data. This will be explained in detail with reference to FIGS. 7 and FIGS. 8.

[0088] FIG. 7 is a diagram illustrating the operation to prevent changes in the amplitude of a clock signal when a bidirectional wireless data transmission and reception device according to one embodiment of the present invention is in reception mode.

[0089] Referring to FIG. 7, a circuit is illustrated showing the configuration and operation of a clock signal amplitude change prevention circuit inside the synchronizer (160) of the receiving device (400). This circuit can prevent the VCLKR clock signal from becoming unstable due to changes in the amplitude of the power signal that occur during SP-LSK data transmission.

[0090] The circuit exemplified in Fig. 7 can be divided into two main parts. The left part may be a part that receives input signals (VTRX1, VTRX2) and generates an envelope signal (Envelope, VENV), and the right part may be a part that generates a clock signal (VCLKR) by comparing the envelope signal with a reference voltage (VREF).

[0091] Here, the input signals VTRX1 and VTRX2 may be signals output from the transceiver (110) of the bidirectional wireless data transmission and reception device (400) in reception mode. VTRX1 and VTRX2 may be signals for voltages induced in the antenna (170) coil of the bidirectional wireless data transmission and reception device (400) in reception mode. That is, VTRX1 and VTRX2 may be voltages across the antenna (170) coil of the bidirectional wireless data transmission and reception device (400). For example, VTRX1 and VTRX2 may be output signals of the low-side buffer (see (c) in FIG. 5) inside the transceiver (110), which may represent the voltage difference across the antenna (170) coil of the bidirectional wireless data transmission and reception device (400). These voltage differences include both the received power signal and the data signal.

[0092] The circuit on the left in Fig. 7 can generate a VENV signal by extracting the envelope of the input signals (VTRX1 and VTRX2). The generated VENV signal may be a signal representing the amplitude change of the input signals.

[0093] Meanwhile, when SP-LSK data transmission is initiated, the VULIN signal can become High, and as a result, the 'Envelope Hold Scheme' according to one embodiment of the present invention can be activated. As shown in the example of FIG. 7, the 'Envelope Hold Scheme' can fix the VENV signal to a specific level when the VULIN signal is High (i.e., when SP-LSK data transmission is initiated).

[0094] That is, in the circuit on the right side of FIG. 7, the operational amplifier on the right side can generate a clock signal VCLKR by comparing a fixed VENV signal with a reference voltage VREF. Since the VENV signal is fixed, the amplitude change of the voltage induced in the antenna (170) coil of the bidirectional wireless data transceiver (400) in receiving mode due to SP-LSK signal transmission may not affect the generation of the clock signal (VCLKR). As a result, a stable clock signal (VCLKR) is generated, and ODSK data can be accurately demodulated.

[0095] FIGS. 8 and 9 are drawings of data measurement waveforms transmitted and received according to an embodiment of the present invention.

[0096] FIG. 8 is a graph of experimental results showing whether a transmitting device (300) and a receiving device (400) according to an embodiment of the present invention operate stably when transmitting data at a speed of 100kbps. Through FIG. 8, it can be confirmed that the clock signal (VCLKT) generated by the transmitting device (300) and the clock signal (VCLKR) regenerated based on it by the receiving device (400) are synchronized. In addition, it can be seen that when the UL Data IN (uplink data transmission) signal is High, the Envelope Hold function operates so that the VENV signal is maintained at a constant level, which indicates that interference caused by uplink data transmission is protected so as not to affect downlink data reception (ODSK). As a result, it can be seen that the transmitting device (300) and the receiving device (400) according to an embodiment of the present invention can achieve stable 100kbps data transmission.

[0097] FIG. 9 is a graph of experimental results confirming whether data is accurately transmitted and received between a transmitting device (300) and a receiving device (400) according to an embodiment of the present invention when bidirectional communication is performed at a fast speed of 400kbps. Through the graph of FIG. 9, it can be confirmed that downlink data (DLOUT) is accurately demodulated based on a clock signal (VCLKT), and at the same time, uplink data (VUNIN) transmission and the corresponding uplink data demodulation (ULOUT) are successfully performed.

[0098] FIGS. 10 and FIGS. 11 are photographs of an experimental setup of a bidirectional wireless data transmission and reception device according to one embodiment of the present invention.

[0099] Referring to FIG. 10, photographs and specifications of the transmitting device (300) antenna (170) coil and the receiving device (400) antenna (170) coil used in the experiment of the present invention are exemplified. The diameter of the transmitting device (300) antenna (170) coil is 35 mm, and the diameter of the receiving device (400) antenna (170) coil is 30 mm, and the inductances of each coil are 1.39 [μH] and 1.13 [μH], respectively, and the Q factors may be 80 and 79.

[0100] Referring to FIG. 11, an image of an in-vitro test environment of a transmitting device (300, TX mode) and a receiving device (400, RX mode) according to one embodiment of the present invention is shown. A pork sample was placed between the transmitting device (300, TX mode) and the receiving device (400, RX mode) to create an environment similar to actual biological tissue. Through this experimental setup, it was verified that the present invention operates effectively even in an environment similar to biological tissue.

[0102] FIG. 12 is a diagram comparing experimental results according to one embodiment of the present invention with experimental results according to the prior art.

[0103] Referring to FIG. 12, it can be seen that the present invention uses an 180 nm BCD process, supports full-duplex communication at a frequency of 13.56 MHz, and achieves synchronized data recovery without additional components. Furthermore, it can be seen that the present invention exhibits a high data transfer rate of 400 kbps and low power consumption of 32 mW, and achieves an end-to-end efficiency of 34.8%. Compared to other studies, the present invention demonstrates superior performance in terms of full-duplex communication, synchronized data recovery, high data transfer rates, and low power consumption. In particular, it can be said that this represents a significant advancement over existing technologies in that such performance was achieved without additional components.

[0104] For reference, the prior studies abbreviated in Fig. 12 are as follows.

[0105] 2024 JSSC [4]: H. Lee et al., "A 92.7%-Efficiency 6.78-MHz Energy-Resuscitating Resonant Regulating Rectifier With Dual Outputs for Wirelessly Powered Devices” IEEE Journal of Solid-State Circuits, vol. 59, no. 10, pp. 3204-3217, 2024.

[0106] 2024 TBCAS [5]: M. J. Karimi et al., "Wirelessly Powered and Bi-Directional Data Communication System With Adaptive Conversion Chain for Multisite Biomedical Implants Over Single Inductive Link," IEEE Transactions on Biomedical Circuits and Systems, vol. 18, no. 3, pp. 636-647, 2024.

[0107] 2016 JSSC [2]: H. Kassiri et al., "Battery-less Tri-band-Radio Neuro-monitor and Responsive Neurostimulator for Diagnostics and Treatment of Neurological Disorders,” IEEE Journal of Solid-State Circuits, vol. 51, no. 5, pp. 1274-1289, 2016.

[0108] 2021 ISSCC [6]: Y. Park et al., "33.7 A Frequency-Splitting-Based Wireless Power and Data Transfer IC for Neural Prostheses with Simultaneous 115mW Power and 2.5Mb / s Forward Data Delivery" ISSCC, 2021.

[0109] 2023 VLSI [7]: J. Li et al., "Wireless Body-Area Network Transceiver ICs with Concurrent Body-Coupled Powering and Communication using Single Electrode” Symposium on VLSI Circuits, 2023.

[0111] In this way, according to the present invention, wireless power and data can be transmitted and received efficiently and stably in a low-power system through a synchronized full-duplex communication method using a single coil.

[0113] Meanwhile, the embodiments described above may be implemented as hardware components, software components, and / or combinations of hardware and software components. For example, the devices, methods, and components described in the embodiments may be implemented using a general-purpose computer or a special-purpose computer, such as, for example, a processor, a controller, an arithmetic logic unit (ALU), a digital signal processor, a microcomputer, a field programmable gate array (FPGA), a programmable logic unit (PLU), a microprocessor, or any other device capable of executing and responding to instructions. The processing unit may execute an operating system (OS) and software applications executed on said operating system. Additionally, the processing unit may access, store, manipulate, process, and generate data in response to the execution of the software. For ease of understanding, the processing unit may be described as being used as a single unit, but those skilled in the art will understand that the processing unit may include multiple processing elements and / or multiple types of processing elements. For example, the processing unit may include multiple processors or one processor and one controller. In addition, other processing configurations, such as parallel processors, are also possible.

[0114] Software may include computer programs, code, instructions, or a combination of one or more of these, and may configure a processing unit to operate as desired or instruct the processing unit independently or collectively. Software and / or data may be permanently or temporarily embodied in any type of machine, component, physical device, virtual equipment, computer storage medium, or device so as to be interpreted by the processing unit or to provide instructions or data to the processing unit. Software may be distributed over networked computer systems and may be stored or executed in a distributed manner. Software and data may be stored on computer-readable recording media.

[0115] The method according to the embodiment may be implemented in the form of program instructions that can be executed through various computer means and recorded on a computer-readable medium. The computer-readable medium may store program instructions, data files, data structures, etc., either individually or in combination, and the program instructions recorded on the medium may be those specifically designed and configured for the embodiment or those known and available to those skilled in the art of computer software. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tapes; optical recording media such as CD-ROMs and DVDs; magneto-optical media such as floptical disks; and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, and flash memory. Examples of program instructions include machine code, such as that generated by a compiler, as well as high-level language code that can be executed by a computer using an interpreter, etc.

[0116] The hardware device described above may be configured to operate as one or more software modules to perform the operation of the embodiment, and vice versa.

[0118] The description of the above-described embodiments is merely an example provided with reference to the drawings for a more thorough understanding of the present disclosure, and should not be interpreted as limiting the technical scope of the present disclosure. Explanation of the symbols

[0120] 10: Smart devices 20: Bio-devices 30: Wearable devices 110: Transceiver 120: 1st Modulator 130: 1st Demodulator 140: Second Demodulator 150: 2nd Modulator 160: Synchronizer 170: Antenna

Claims

Claim 1 A short-range bidirectional wireless data transmission and reception device comprising: a synchronizer for generating a clock signal for synchronized data demodulation of a first communication method and a second communication method; a first communication modem that, using the clock signal, modulates downlink data into the first communication method in a transmission mode and demodulates a received signal into the first communication method in a reception mode; and a second communication modem that, using the clock signal, modulates uplink data into the second communication method in a transmission mode and demodulates a received signal into the second communication method in a reception mode; wherein the device operates in either the transmission mode or the reception mode. Claim 2 A short-range bidirectional wireless data transmission and reception device according to claim 1, wherein the first communication modem comprises: a first modulator that is activated in the transmission mode and deactivated in the reception mode; and a first demodulator that is deactivated in the transmission mode and activated in the reception mode. Claim 3 In paragraph 2, the first communication modem is a short-range bidirectional wireless data transmission and reception device corresponding to the ODSK (Off-Duration Shift Keying) method. Claim 4 A short-range bidirectional wireless data transmission and reception device according to claim 1, wherein the second communication modem comprises: a second modulator that is deactivated in the transmission mode and activated in the reception mode; and a second demodulator that is activated in the transmission mode and deactivated in the reception mode. Claim 5 In paragraph 2, the second communication modem is a short-range bidirectional wireless data transmission and reception device corresponding to the SP-LSK (Short-Pulse Load Shift Keying) method. Claim 6 In paragraph 2, the first modulator modulates transmission data in a first interval of one cycle of the clock signal in the transmission mode, a short-range bidirectional wireless data transmission and reception device. Claim 7 In claim 6, the second communication modem comprises: a second modulator that is deactivated in the transmission mode and activated in the reception mode; and a second demodulator that is activated in the transmission mode and deactivated in the reception mode; wherein the second modulator modulates transmission data in a second interval of one cycle of the clock signal in the reception mode, a short-range bidirectional wireless data transmission and reception device. Claim 8 A short-range bidirectional wireless data transmission and reception device according to claim 7, wherein the first section and the second section are configured not to overlap each other. Claim 9 A short-range bidirectional wireless data transmission and reception device according to claim 1, wherein in the transmission mode, the data of the first communication method is transmitted superimposed on a power signal. Claim 10 In claim 9, the synchronizer prevents a change in the amplitude of the clock signal during data transmission of the second communication method in the receiving mode, a short-range bidirectional wireless data transmission and reception device. Claim 11 A short-range bidirectional wireless data transmission and reception device according to claim 1, wherein the synchronizer fixes an internal reference voltage during data transmission of the second communication method in the receiving mode to prevent changes in the amplitude of the clock signal. Claim 12 A short-range bidirectional wireless data transmission and reception device, further comprising: a single coil that transmits data of the first communication method and receives data of the second communication method in the transmission mode according to claim 1. Claim 13 In claim 12, the single coil transmits data of the second communication method and receives data of the first communication method in the receiving mode, a short-range bidirectional wireless data transmission and reception device.

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