A power-adjustable keyboard system, control method and authentication test method

Abstract

The application discloses a power-adjustable keyboard system, a control method and an authentication test method, and belongs to the technical field of computer external devices. The intelligent keyboard system realizes intelligent selection of a communication antenna and dynamic adjustment of transmission power through cooperative work of a main antenna, an auxiliary antenna, a proximity sensing module and a control module. This not only solves the pain point of manual power adjustment in electromagnetic compatibility authentication test, but also flexibly optimizes the performance and power consumption of wireless communication according to the proximity state of the user and the keyboard and the use scene of the keyboard in actual use of the user, significantly improves the practicability and user experience of the product, and overcomes the problems of high power consumption, short battery life and the like in the prior art.

Description

Technical Field

[0001] This invention relates to the field of computer peripherals technology, and in particular to a power-adjustable keyboard system, control method, and certification testing method. Background Technology

[0002] Electromagnetic compatibility (EMC) certification testing is a crucial step in verifying the safety and performance of electronic and electrical products, especially for wireless peripherals such as wireless keyboards. Currently, most wireless keyboards on the market use a fixed transmit power mode. During EMC certification testing, when the keyboard is tested in conjunction with a host device (such as a personal computer or tablet), the fixed transmit power encounters electromagnetic interference (EMI) issues. Engineers need to repeatedly and manually adjust the wireless keyboard's communication power parameters to meet certification test requirements. This process not only significantly extends the testing cycle and increases R&D costs, but also makes it difficult to ensure the stability and repeatability of test results due to the subjectivity of human intervention, hindering rapid product launch.

[0003] Furthermore, in everyday user scenarios, existing wireless keyboards lack the ability to dynamically perceive the operating environment. Wireless keyboards cannot recognize the user's proximity to the host device or their operational intentions; for example, they cannot distinguish whether the user is typing, briefly away, or completely idle. Therefore, the wireless communication module in the wireless keyboard always operates at a preset power, resulting in high-intensity signal transmission even when the user is far away, leading to wasted power. During actual operation, the excessively strong signal may cause unnecessary radiation interference. This static power management mechanism directly exacerbates the power consumption burden of the wireless keyboard, shortens battery life, forces users to charge or replace batteries frequently, and significantly reduces usability. Summary of the Invention

[0004] The purpose of this invention is to provide a keyboard system, control method, and certification testing method with adjustable power, so as to at least solve the problem that the communication power of the keyboard end cannot be adjusted in a timely and flexible manner in the prior art.

[0005] To achieve the above objectives, the present invention proposes a power-adjustable keyboard system, comprising: Keyboard body; The main antenna is arranged in a first region within the keyboard body; A secondary antenna is arranged in the second region within the keyboard body; A proximity sensing module is used to sense external signals approaching the keyboard body and generate a sensing signal; The control module is electrically connected to the proximity sensing module, the main antenna, and the secondary antenna, respectively. The control module is configured to generate control commands in response to the sensing signal to perform selection or switching operations on the main antenna and the secondary antenna.

[0006] As a further aspect of the present invention, it also includes a radio frequency switch and a wireless communication module disposed in the keyboard body; The output of the control module is connected to the input of the RF switch; different outputs of the RF switch are respectively connected to the main antenna and the secondary antenna; the control module switches the path connection between the main antenna or the secondary antenna and the RF switch by sending the control command to the RF switch.

[0007] As a further aspect of the present invention, the control module is further configured to synchronously control the transmission power level of the wireless communication module based on the sensing signal.

[0008] As a further aspect of the present invention: the proximity sensing module is a specific absorption rate sensor, and part of the radiator of the sub-antenna directly constitutes the sensing electrode of the specific absorption rate sensor.

[0009] As a further aspect of the present invention: the sub-antenna includes a pair of symmetrically arranged conductive plates, which serve as the sensing electrodes and are placed on the left and right sides of the second region.

[0010] To achieve the above objectives, the present invention also proposes a control method for a power-adjustable keyboard system, the method comprising the following steps: The proximity sensing module senses external signals approaching the keyboard body and generates corresponding sensing signals. Based on the sensed signal and the current usage scenario of the keyboard body, the control module outputs control commands to select the main antenna or the secondary antenna for wireless communication, and adjusts the transmission power of the wireless communication module in the keyboard body accordingly.

[0011] As a further aspect of the present invention, the current usage scenarios of the keyboard body include at least the following three: powered on but not connected to the host, powered on and connected to the host in standby mode, and powered on and connected to the host in operation.

[0012] As a further aspect of the present invention: when the keyboard body is powered on and connected to the host, when the proximity sensing module detects that a user is approaching or touching the keyboard body, the control module outputs a control command to select the main antenna for communication and instructs the wireless communication module to reduce its transmission power; when the proximity sensing module detects that the user is moving away from the keyboard body, the control module outputs a control command to switch the secondary antenna for communication and restores or increases the power of the wireless communication module.

[0013] As a further aspect of the present invention: when the keyboard body is powered on but not connected to the host or powered on and connected to the host in standby mode, the control module instructs the main antenna to perform communication without reducing the transmission power of the wireless communication module.

[0014] The present invention also provides a certification test method for a power adjustable keyboard system. During the certification test, the control module directs the wireless communication path to the secondary antenna, disconnects or puts the main antenna in a non-working state, and / or locks the transmission power of the wireless communication module at the lowest level for certification testing.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects: The intelligent keyboard system of this invention achieves intelligent selection of the communication antenna and dynamic adjustment of the transmission power through the coordinated operation of the main antenna, secondary antenna, proximity sensing module, and control module. This not only solves the pain point of manually adjusting the power in electromagnetic compatibility certification testing, but also flexibly optimizes the performance and power consumption of wireless communication based on the user's proximity to the keyboard and the keyboard's usage scenario in actual use. This significantly improves the product's practicality and user experience, overcoming problems such as high power consumption and short battery life in existing technologies.

[0016] Furthermore, this invention creatively integrates the secondary antenna as the sensing electrode of a specific absorption rate sensor. This physical-level integrated design achieves proximity sensing functionality without increasing additional space or cost, demonstrating a high degree of design innovation, simplifying the structure, and improving reliability. Attached Figure Description

[0017] Figure 1 This is a block diagram of the intelligent keyboard system structure in an embodiment of the present invention; Figure 2 This is a control logic diagram of the intelligent keyboard system in an embodiment of the present invention; Figure 3 This is a flowchart of the power control method for the keyboard when it is powered on and connected to the host. Detailed Implementation

[0018] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this application, and not all embodiments. The components of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0019] As mentioned in the background section, traditional wireless keyboards often use a fixed power transmission for their communication modules during electromagnetic compatibility certification testing, which can easily lead to excessive electromagnetic interference. Engineers need to manually adjust the power repeatedly, a tedious and inefficient process. Furthermore, in actual use, existing keyboards cannot sense the user's proximity or the host's operating status, resulting in inflexible adjustment of communication signal strength. This leads to higher power consumption, shorter battery life, and negatively impacts the user experience.

[0020] Example 1 Based on this, such as Figure 1 As shown in the figure, this application proposes a keyboard system with adjustable power. The system includes a keyboard body, a main antenna, a secondary antenna, a proximity sensing module, and a control module.

[0021] The keyboard body serves as the basic structural support for the smart keyboard system. This keyboard body can be made of various materials, such as plastic, metal, or composite materials, and its internal space is rationally planned to accommodate all necessary components, including circuit boards, keys, batteries, and wireless communication modules (such as Bluetooth). Its internal structure is based on existing technology and will not be elaborated upon here.

[0022] In this embodiment, the main antenna ANT_1 is preferably located in a first region within the keyboard body where electromagnetic interference is minimal. The selection of this first region aims to minimize electromagnetic interference from other electronic components within the keyboard, ensuring the radiation performance of the main antenna ANT_1. For example, this first region can be located at the edge, corner, or a specific location away from high-frequency circuitry within the keyboard body. The main antenna ANT_1 can employ various antenna types, such as an inverted-F antenna (IFA), a monopole antenna, or a dipole antenna, with its specific structure and dimensions designed according to the required operating frequency and space constraints. By placing the main antenna in a first region with minimal electromagnetic interference, better signal quality and transmission efficiency can be ensured under conventional communication modes.

[0023] The secondary antenna ANT_2 is preferably located in the second area within the main body of the keyboard, that is, below the key area that is easily accessible to the user during operation. For example, the secondary antenna ANT_2 can be placed below the space bar, below the arrow key area, or below the numeric keypad area.

[0024] In this embodiment, the proximity sensing module is used to sense external signals approaching the keyboard body and generate a sensing signal. That is, it senses the proximity of the user to the keyboard body and generates a sensing signal based on the sensing results. For wireless keyboards, a specific absorptivity sensor (SAR sensor) is preferably used for the proximity sensing module. A SAR sensor is a sensor specifically designed to detect changes in electromagnetic properties caused by changes in electromagnetic field absorption or reflection when a human body or object approaches. Its working principle is typically based on changes in capacitance, inductance, or radio frequency signal strength. This sensor can efficiently and accurately sense the proximity of the user to the keyboard body and generate a corresponding sensing signal (SAR_L), providing reliable input for subsequent control modules.

[0025] It is worth noting that, to facilitate the proximity sensing module in detecting the user's proximity to the keyboard, in this embodiment, a portion of the radiator of the secondary antenna ANT_2 directly constitutes the sensing electrode of the SAR sensor. The secondary antenna ANT_2 itself is a conductive structure used for wireless communication, and its radiator is the core component for generating and receiving electromagnetic waves. The sensing electrode is the conductive component in the SAR sensor used to sense changes in the electromagnetic field. In other words, it can also be understood as integrating the SAR sensor onto the secondary antenna ANT_2.

[0026] By integrating the SAR sensor onto the secondary antenna ANT_2, the radiator structure of ANT_2 is cleverly reused as the sensing electrode of the SAR sensor while simultaneously performing wireless communication functions. This not only eliminates the need for a separate sensing electrode, significantly reducing the number of components and physical space occupied within the keyboard body, but also lowers material costs and assembly complexity, improving the overall integration of the smart keyboard system. Furthermore, since the SAR sensor is specifically optimized for human proximity sensing, its sensing accuracy and response speed are guaranteed. This ensures that the control module can perform timely and efficient selection or switching operations between the main antenna ANT_1 and the secondary antenna ANT_2 based on accurate sensing signals, as well as subsequent adjustments to the transmission power of the wireless communication module, thereby optimizing the overall performance and user experience of the keyboard system.

[0027] Furthermore, in other examples, the secondary antenna ANT_2 is configured to include a pair of symmetrically arranged conductive sheets, which serve as sensing electrodes positioned on the lower left and right sides of the keyboard key area, for example, on either side of the space bar. A conductive sheet refers to a thin, sheet-like structure with good conductivity, which can be part of an antenna radiator or a separate sensing component. Symmetrical arrangement means that the two conductive sheets are spatially mirror- or rotationally symmetrically distributed with respect to the keyboard's central axis or center point. Specifically, the conductive sheets can be implemented in various forms. For example, they can be copper foil patterns printed on a flexible printed circuit board (FPC), adapting to the complex internal structure of the keyboard through the FPC's flexibility; or they can be conductive areas directly etched onto the printed circuit board (PCB) of the keyboard body.

[0028] The secondary antenna ANT_2 uses a pair of symmetrically arranged conductive plates as sensing electrodes, positioned on the lower left and right sides of the keyboard key area. This effectively solves the potential uniformity and stability issues associated with the sensor electrode arrangement. The symmetrical conductive plate design ensures a uniform distribution of the induced electric field in the user's operating area, avoiding sensing deviations caused by single-point sensing or asymmetrical arrangement. Simultaneously, positioning the sensing electrodes on the lower left and right sides of the keyboard key area provides more comprehensive and sensitive coverage of typical user proximity or contact areas, significantly improving the accuracy and reliability of the proximity sensing module in detecting the user's proximity to the keyboard. Consequently, the control module can receive more precise sensing signals, generating more accurate control commands to optimize the selection or switching operations between the main antenna ANT_1 and the secondary antenna ANT_2, and more accurately adjust the transmission power level of the wireless communication module.

[0029] In this embodiment, the control module is electrically connected to the proximity sensing module, the main antenna ANT_1, and the secondary antenna ANT_2, respectively. This control module is the intelligent decision-making center of the system and is configured to respond to the sensing signals generated by the proximity sensing module (SAR sensor).

[0030] Specifically, after receiving the sensing signal, the control module analyzes and processes it. For example, it compares the strength of the sensing signal with a preset threshold to determine whether the user is approaching or moving away from the keyboard. Based on this analysis, the control module generates corresponding control commands. These commands are used to perform selection or switching operations between the main antenna ANT_1 and the secondary antenna ANT_2.

[0031] In other examples, to improve the efficiency and reliability of selection or switching operations between the main antenna ANT_1 and the secondary antenna ANT_2, the smart keyboard system also includes an RF switch. The output of the control module is connected to the input of the RF switch, and the different outputs of the RF switch are connected to the main antenna ANT_1 and the secondary antenna ANT_2, respectively. The control module switches the path connection between the main antenna ANT_1 or the secondary antenna ANT_2 and the wireless communication module by sending control commands to the RF switch.

[0032] Specifically, an RF switch is an electronic device used to switch between different RF signal paths. It can connect one input port to one of multiple output ports, or one of multiple input ports to one output port, depending on a control signal. In this application, the RF switch enables fast and reliable physical connection switching between the main antenna ANT_1 and the secondary antenna ANT_2 and the wireless communication module. The main antenna ANT_1 and the secondary antenna ANT_2 are connected to different outputs of the RF switch, ensuring that they can be independently connected to the RF switch, providing a physical basis for the control module to select different antennas.

[0033] By setting up an RF switch, an efficient and reliable antenna path switching mechanism is provided. When the control module responds to the sensing signal generated by the proximity sensing module and generates a control command based on the sensing signal, the control command no longer directly operates the antenna connection, but is sent to the RF switch. The RF switch can quickly switch the physical path between the main antenna ANT_1 and the secondary antenna ANT_2 according to the received control command, connecting one of the antennas to the wireless communication module. This fast physical-level switching avoids the delays and uncertainties that may be caused by traditional software or complex circuit switching, significantly improving the efficiency and reliability of the selection or switching operation between the main antenna ANT_1 and the secondary antenna ANT_2. In addition, the main antenna ANT_1 and the secondary antenna ANT_2 are connected to different output terminals of the RF switch, ensuring that they are independently accessible. This allows the control module to flexibly select the optimal antenna for communication according to different usage scenarios and sensing signals, thereby optimizing the system's response speed and overall wireless communication performance, and effectively solving the problems of lack of concrete implementation, low efficiency, and insufficient reliability of antenna switching mechanisms.

[0034] It should also be noted that the control module is further configured to synchronously control the transmit power level of the wireless communication module (Bluetooth TX) based on the SAR sensor's sensing signal (SAR_L). Specifically, the control module is not only responsible for antenna selection or switching, but also for the dynamic management of the wireless communication module's transmit power. The control module can be a microcontroller (MCU), digital signal processor (DSP), or application-specific integrated circuit (ASIC), implementing these functions by executing preset firmware or program instructions. For example, the control module may include a power management unit that receives signals from the proximity sensing module and sends power adjustment commands to the wireless communication module according to a preset power control strategy.

[0035] In this embodiment, the control module can also synchronously control the transmit power of the wireless communication module. Synchronous control means that while performing the selection or switching operation between the main antenna ANT_1 and the secondary antenna ANT_2, the control module coordinately adjusts the transmit power level of the wireless communication module within a millisecond time interval. This synchronization ensures consistency between antenna selection and power adjustment, avoiding communication interruptions or inefficiencies that may result from asynchronous operations. For example, when the control module decides to switch to the secondary antenna ANT_2, it immediately adjusts the transmit power of the wireless communication module according to the SAR_L signal; or, when the SAR_L signal indicates that the user is moving away, the control module simultaneously increases the transmit power of the wireless communication module while switching antennas.

[0036] The transmit power level of a wireless communication module refers to the level of radio frequency output power used by the module during wireless communication. Typically, a wireless communication module supports multiple configurable transmit power levels, such as high, medium, and low, or more finely stepped adjustments. The control module selects or sets the current transmit power level by sending specific control commands to the wireless communication module. For example, when a user approaches, the control module can instruct the wireless communication module to reduce the transmit power to a lower level to reduce radiation and power consumption; when the user moves away, it can instruct it to increase the power to a higher level to ensure communication stability and coverage.

[0037] The intelligent keyboard system proposed in this embodiment can dynamically and synchronously control the transmission power of the wireless communication module based on the proximity of the user to the keyboard. When the proximity sensor module detects the user approaching the keyboard, the control module, while performing antenna selection or switching operations, can simultaneously instruct the wireless communication module to reduce its transmission power level. This effectively reduces unnecessary radio frequency energy radiation, lowers the overall system power consumption, and thus extends battery life. Conversely, when the user moves away from the keyboard, the control module can synchronously increase the transmission power to ensure the stability and reliability of the communication link and avoid communication interruptions due to insufficient power. This intelligent power management mechanism, working in conjunction with the dual-antenna selection strategy, enables the system to optimize energy consumption to the maximum extent while ensuring communication performance, significantly improving the user experience and solving the problems of high power consumption and short battery life caused by fixed or manual power adjustments in existing technologies.

[0038] Example 2 Existing keyboard systems are easily affected by their own inherent characteristics or external conditions during EMC certification testing. This can lead to various electromagnetic interference issues in the EMC field when used in conjunction with host device certification. Engineers need to repeatedly and manually adjust the communication power parameters of the wireless keyboard to meet the certification test requirements.

[0039] Based on this, this embodiment proposes an authentication test method. When conducting the authentication test, the control module directs the wireless communication path of the keyboard system to the secondary antenna ANT_2, disconnects or puts the main antenna ANT_1 into a non-working state, and / or locks the transmission power of the wireless communication module to the lowest level to conduct the authentication test.

[0040] Specifically, the electromagnetic compatibility (EMC) certification test mode refers to a special operating state pre-set within the keyboard system, providing a stable and controllable test environment for EMC certification testing. In this mode, the control module directs the wireless communication path to the secondary antenna ANT_2. This is achieved by sending control commands to the RF switch, causing the RF switch to connect the secondary antenna ANT_2 to the wireless communication module, while disconnecting or disabling the main antenna ANT_1. This aims to avoid additional interference that the main antenna ANT_1 may generate in the electromagnetically optimized area, thus providing a more stable and predictable radiation source for EMC testing.

[0041] Meanwhile, in this mode, the control module will actively shield or not process any sensing signals from the proximity sensor module. This can be achieved by setting a status flag in the control module's firmware or software that disables the processing logic for sensing signals in test mode; or by temporarily interrupting the data flow between the proximity sensor module and the control module's decision unit at the hardware level to ensure that dynamic adjustments to antenna selection or transmit power are not triggered when the user accidentally approaches or moves away from the keyboard during testing, thereby maintaining the stability of the test environment.

[0042] Furthermore, the control module forces the wireless communication module to operate at its preset minimum transmit power level and prevents any dynamic power adjustments. This is typically achieved by the control module sending a specific configuration command to the wireless communication module, setting the internal transmit power register of the wireless communication module to the minimum value. This setting remains unchanged throughout the test mode, thereby directly minimizing electromagnetic radiation, effectively eliminating the risk of electromagnetic interference, and improving the efficiency of EMC certification testing.

[0043] By introducing a preset electromagnetic compatibility (EMC) certification test mode, this embodiment effectively solves the problem of cumbersome and inefficient manual adjustments to communication power due to unstable power control during EMC certification testing. In this mode, the control module selects the secondary antenna ANT_2 as the communication antenna, avoiding additional interference from the main antenna ANT_1 and providing a more stable radiation source for testing. Simultaneously, the control module ignores the proximity sensor signal, ensuring that even if a user approaches or moves away from the keyboard during testing, it will not trigger dynamic changes in antenna selection or transmission power, thus maintaining the stability and repeatability of the test environment. Furthermore, the control module locks the keyboard's wireless communication module transmission power to a preset minimum level, directly reducing electromagnetic radiation to the lowest possible level and significantly lowering the risk of exceeding electromagnetic interference limits. Through the synergistic effect of the above technical solutions, manual intervention by engineers is unnecessary, significantly improving testing efficiency and ensuring the accuracy and reliability of test results.

[0044] Example 3 This embodiment proposes a control method for a power-adjustable keyboard system. The method is applied to the aforementioned intelligent keyboard system. The specific steps include: monitoring the proximity state between the user and the keyboard through a proximity sensing module and generating a corresponding sensing signal; the control module outputs a control command based on the sensing signal and combined with the current usage scenario of the keyboard to select the main antenna ANT_1 or the secondary antenna ANT_2 for wireless communication, and adjusts the transmission power of the keyboard's wireless communication module accordingly.

[0045] This method first monitors the proximity of the user to the keyboard using a proximity sensing module (SAR sensor) and generates a corresponding sensing signal (SAR_L). This step aims to acquire real-time information about the physical distance or contact between the user and the keyboard, serving as the basic input for intelligent control. Based on this, the control module, using the sensing signal (SAR_L) and considering the current keyboard usage scenario, outputs control commands to select either the main antenna ANT_1 or the secondary antenna ANT_2 for wireless communication and adjusts the transmit power of the keyboard's wireless communication module (Bluetooth TX) accordingly. The goal is to dynamically optimize antenna usage and power output based on user behavior and the keyboard's operating environment, achieving a balance between performance and power consumption.

[0046] This embodiment effectively solves the power consumption problem and user experience defects caused by the lack of scene adaptability in existing technologies by intelligently integrating the user's proximity status and the current keyboard usage scenario, and dynamically optimizing antenna selection and transmission power adjustment, thus achieving high efficiency, energy saving, and automated control. Specifically, the proximity sensing module captures user operation behavior in real time, providing basic input to the system and ensuring that control decisions are based on actual user interaction. Building on this, the control module introduces scene dimensions such as working or standby modes, making the decisions more comprehensive and avoiding the shortcomings of relying on a single signal. Control commands are output to select the main antenna or secondary antenna for wireless communication, optimizing antenna usage according to the current keyboard usage scenario and user proximity status. For example, the main antenna is selected when the user is approaching to reduce radiation impact, and the secondary antenna is switched to maintain signal strength when the user is moving away. Simultaneously, the transmission power of the wireless communication module is adjusted accordingly, directly addressing the power consumption problem. Power is reduced in low-demand scenarios to save energy, and increased in high-demand scenarios to ensure stable connection, thereby synergistically improving overall efficiency. This dynamic adjustment mechanism significantly reduces the overall power consumption of the keyboard, extends battery life, and improves the user experience. Furthermore, by combining the current keyboard usage scenario, the system can better adapt to different working environments. For example, in the electromagnetic compatibility certification test mode, specific antenna selection and power levels can be preset, thereby simplifying the certification process and improving testing efficiency.

[0047] The current usage scenario of the keyboard refers to the operating state or working mode of the smart keyboard system at a specific point in time. These scenarios reflect the connection status between the keyboard and the host, the activity status of the host, and the power status of the keyboard itself. This scenario information can be determined by the control module monitoring the keyboard's power status, wireless communication connection status, and status information received from the host, or by using preset timers and user behavior pattern recognition algorithms. The current usage scenario of the keyboard includes at least the following three: powered on but not connected to the host, powered on and connected to the host in standby mode, and powered on and connected to the host in operation.

[0048] "Power on but not connected to host" means that the keyboard is powered on and started, but has not yet established a wireless communication connection with any host.

[0049] "Power on and connected to host in standby mode" means that the keyboard has been powered on and successfully established a wireless communication connection with the host, but the host is currently in a low-power mode (such as standby, hibernation, or screen off). "Powered on and connected to the host" means that the keyboard has been powered on and successfully established a wireless communication connection with the host, and the host is currently in normal operation or active use.

[0050] By clearly defining the current usage scenario of the keyboard, the control module can be provided with a more refined basis for decision-making. In the control method based on dual antennas and proximity sensing described above, the control module no longer processes the sensing signals in a general way, but can combine this specific scenario information to output control commands more accurately, select the main antenna or the secondary antenna for wireless communication, and adjust the transmission power of the wireless communication module accordingly.

[0051] Specifically, such as Figure 3 As shown, when the keyboard is powered on and connected to the host, the system can intelligently judge and dynamically adjust based on the user's proximity to the keyboard. When the user approaches or touches the keyboard, the system selects the primary antenna and reduces its transmission power. This helps reduce electromagnetic radiation during close-range communication, minimizing potential impact on the user and avoiding unnecessary energy consumption, thus optimizing communication power consumption. When the user moves away from the keyboard, the system switches to the secondary antenna and restores or increases its transmission power. This ensures the stability and reliability of communication at longer distances, avoiding connection interruptions or data transmission errors caused by signal attenuation, thereby improving the user experience. This user-behavior-based dynamic antenna selection and power adjustment mechanism achieves an intelligent balance between communication performance, power consumption, and electromagnetic compatibility, requiring no manual user intervention, significantly extending battery life, and improving the overall user experience.

[0052] In critical scenarios where the keyboard is powered on but not connected to the host, or powered on and connected to the host in standby mode, the control module selects the main antenna for communication and maintains the transmission power of the wireless communication module without reduction. This effectively avoids communication instability or inability to connect to the host due to insufficient signal strength. This strategy ensures that the keyboard maintains high communication capabilities when not connected or in standby mode, enabling rapid response to connection requests or waking up the host, thus improving system responsiveness and user experience.

[0053] This application utilizes a combination of SAR sensor sensing, intelligent decision-making by the system MCU, antenna switching, and dynamic adjustment of communication power. The keyboard can automatically optimize communication performance, reduce power consumption, and extend battery life based on actual usage and environment. It achieves millisecond-level dynamic adjustment of transmission power, saving approximately 15% of communication power consumption and extending battery life by about 20% in typical office scenarios compared to traditional fixed-power keyboards. The dual-antenna design, combined with an intelligent switching algorithm, ensures automatic selection of the less interfering antenna or frequency band in complex electromagnetic environments (such as multi-device interference), reducing wireless connection interruption rate by 5%, significantly improving the product's EMC (electromagnetic compatibility) certification pass rate, and avoiding tedious manual debugging processes.

[0054] Its control logic is as follows: like Figure 2 As shown, the keyboard's secondary antenna ANT_2 also functions as a SAR sensor. When a user approaches the keyboard (e.g., when the user's fingers or body are close to the keyboard), the secondary antenna ANT_2, acting as a SAR sensor, detects this proximity and generates a SAR_L induction signal. This SAR_L signal is then received by the SAR sensor processor and transmitted to the control module (system MCU).

[0055] The system MCU continuously monitors the SAR_L signal status and the current application scenario of the keyboard (e.g., whether it is connected to the host, in operation, or in standby). Based on the SAR_L signal and the application scenario, the MCU outputs a SW_RF1 / 2 control signal (high or low level) to the RF switch (RF switch device U5705). The RF switch device U5705 switches between the main antenna ANT_1 and the secondary antenna ANT_2 according to the SW_RF1 / 2 signal, directing the selected antenna signal to the ANT port, and then connecting it to the MCU's BT_RFO for processing via a signal matching circuit.

[0056] While switching antennas, the system MCU also triggers a Bluetooth TX power backoff mechanism based on the SAR_L signal and the application scenario. For example, when SAR_L detects a user approaching (high level) and the keyboard is active, the system reduces the Bluetooth TX power to reduce electromagnetic interference and power consumption. Conversely, when no user is detected approaching or the system is in standby mode, no power backoff occurs, and normal communication power is maintained.

[0057] The above-disclosed embodiments are merely a few specific examples of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A keyboard system with adjustable power, characterized in that, include: Keyboard body; The main antenna is arranged in a first region within the keyboard body; A secondary antenna is arranged in the second region within the keyboard body; A proximity sensing module is used to sense external signals approaching the keyboard body and generate a sensing signal; The control module is electrically connected to the proximity sensing module, the main antenna, and the secondary antenna, respectively. The control module is configured to generate control commands in response to the sensing signal to perform selection or switching operations on the main antenna and the secondary antenna.

2. The power-adjustable keyboard system according to claim 1, characterized in that, It also includes a radio frequency switch and a wireless communication module disposed in the keyboard body; The output of the control module is connected to the input of the RF switch; different outputs of the RF switch are respectively connected to the main antenna and the secondary antenna; the control module switches the path connection between the main antenna or the secondary antenna and the RF switch by sending the control command to the RF switch.

3. The power-adjustable keyboard system according to claim 2, characterized in that, The control module is further configured to synchronously control the transmission power level of the wireless communication module based on the sensing signal.

4. The power-adjustable keyboard system according to claim 1, characterized in that, The proximity sensing module is a specific absorption rate sensor, and part of the radiator of the sub-antenna directly constitutes the sensing electrode of the specific absorption rate sensor.

5. The power-adjustable keyboard system according to claim 4, characterized in that, The sub-antenna includes a pair of symmetrically arranged conductive plates, which serve as the sensing electrodes and are positioned on the left and right sides of the second region.

6. A control method, characterized in that, Includes the following steps: The proximity sensing module senses external signals approaching the keyboard body and generates corresponding sensing signals. Based on the sensed signal and the current usage scenario of the keyboard body, the control module outputs control commands to select the main antenna or the secondary antenna for wireless communication, and adjusts the transmission power of the wireless communication module in the keyboard body accordingly.

7. The control method according to claim 6, characterized in that, The keyboard body is currently used in at least three scenarios: powered on but not connected to the host, powered on and connected to the host in standby mode, and powered on and connected to the host in operation.

8. The control method according to claim 7, characterized in that, In a scenario where the keyboard body is powered on and connected to the host, when the proximity sensing module detects that a user is approaching or touching the keyboard body, the control module outputs a control command to select the main antenna for communication and instructs the wireless communication module to reduce its transmission power. When the proximity sensing module detects that the user is moving away from the keyboard body, the control module outputs a control command to switch the secondary antenna for communication and restore or increase the power of the wireless communication module.

9. The control method according to claim 7, characterized in that, In scenarios where the keyboard body is powered on but not connected to the host or powered on and connected to the host in standby mode, the control module instructs the main antenna to perform communication without reducing the transmission power of the wireless communication module.

10. A certification test method, applied to the power-adjustable keyboard system according to any one of claims 1-5, characterized in that: During the certification test, the control module directs the wireless communication path to the secondary antenna, disconnects or disables the main antenna, and / or locks the transmission power of the wireless communication module to the lowest level for the certification test.

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