Antenna tuning circuit and method and electronic equipment

Abstract

The invention discloses an antenna tuning circuit, an antenna tuning method and electronic equipment, relates to the field of radio frequency, and can switch the state of a tuning switch to a Bluetooth frequency band and connect a corresponding matching impedance before shutdown, and keep the state after shutdown, thereby improving the FMD performance. The antenna tuning circuit comprises a tuning switch, a power manager, a tuning controller, a Bluetooth chip and a processor, the Bluetooth module is connected with the Bluetooth antenna; the first end of the tuning switch is connected with the Bluetooth antenna, the second end is grounded through the first impedance matching circuit, the power end is connected with the power manager, and the control end is connected with the tuning controller; the processor is used for acquiring shutdown information of the electronic equipment about to be shut down; and before the electronic equipment is shut down, switching the first end and the second end of the tuning switch to be conducted through the tuning controller, and sending a first control instruction that the power manager supplies power to the tuning switch and the Bluetooth chip to the power manager after the electronic equipment is shut down.

Description

Technical Field

[0001] The present application relates to the field of radio frequency, and in particular, to an antenna tuning circuit, method and electronic device. Background Art

[0002] Currently, many electronic devices such as mobile phones support the find my device (FMD) feature. The FMD feature enables, after the electronic device is powered off, the use of Bluetooth Low Energy (BLE) technology to support the continued operation of a low-power Bluetooth module, which transmits radio frequency signals through an antenna. At this time, other surrounding electronic devices can scan the radio frequency signals to obtain the location of the electronic device and report it to the cloud, so as to achieve the purpose of finding the electronic device.

[0003] However, after the electronic device is powered off, both the tuning switch and the processor are powered off. Before power-off, since the state of the tuning switch is unknown, when the state of the tuning switch is not in the Bluetooth frequency band and the corresponding matching impedance, after power-off, it is neither possible to switch the state of the tuning switch to the Bluetooth frequency band and connect to the corresponding matching impedance, nor to maintain the state in the Bluetooth frequency band and the corresponding matching impedance. As a result, the efficiency of the antenna is reduced and the coverage range of the radio frequency signal is small, leading to poor FMD performance. Summary of the Invention

[0004] Embodiments of the present application provide an antenna tuning circuit, method and electronic device, which can switch the state of the tuning switch to the Bluetooth frequency band and connect to the corresponding matching impedance before the electronic device is powered off, and can keep the tuning switch in the Bluetooth frequency band and the corresponding matching impedance after the electronic device is powered off, improving the efficiency of the antenna and increasing the coverage range of the radio frequency signal, thereby improving FMD performance.

[0005] To achieve the above object, the embodiments of the present application adopt the following technical solutions: In a first aspect, an antenna tuning circuit is provided. The antenna tuning circuit is applied to an electronic device; the antenna tuning circuit is connected to an antenna; the antenna tuning circuit includes a tuning switch, a power manager, a tuning controller, a Bluetooth chip, and a processor; the antenna includes a Bluetooth antenna; the Bluetooth antenna is connected to a first end of the tuning switch; a power supply end of the tuning switch is connected to the power manager, and a control end of the tuning switch is connected to the tuning controller; a second end of the tuning switch is grounded through a first impedance matching circuit; a first end of the Bluetooth chip is connected to the Bluetooth antenna, a second end of the Bluetooth chip is connected to the power manager, and a third end of the Bluetooth chip is connected to the processor; the power manager and the tuning controller are respectively connected to the processor; the processor is configured to: obtain shutdown information of the electronic device; the shutdown information is used to indicate that the electronic device is about to shut down; before the electronic device shuts down, switch the state of the tuning switch to a first state through the tuning controller, and send a first control instruction to the power manager; the first state is used to represent that the first end and the second end of the tuning switch are conducting; the first control instruction is used to instruct that after the electronic device shuts down, the power manager supplies power to the tuning switch and the Bluetooth chip.

[0006] For the above antenna tuning circuit, before the electronic device shuts down, the tuning controller can switch the tuning switch to the first state where the first end and the second end are conducting, and send a first control instruction to the power manager, which is used to instruct that after the electronic device shuts down, the power manager supplies power to the tuning switch and the Bluetooth chip. Therefore, the state of the tuning switch can be switched to the Bluetooth frequency band and the corresponding matching impedance before the electronic device shuts down, and the tuning switch can be kept at the Bluetooth frequency band and the corresponding matching impedance after the electronic device shuts down, improving the efficiency of the antenna and increasing the coverage range of the radio frequency signal, thereby improving the FMD performance.

[0007] In an implementable manner of the first aspect, the processor is further configured to: obtain the battery power of the electronic device; when the battery power of the electronic device is greater than a first battery power threshold, before the electronic device shuts down, switch the state of the tuning switch to the first state through the tuning controller, and send a first control instruction to the power manager.

[0008] In this implementable manner, after obtaining the battery power of the electronic device, the processor determines whether the battery power of the electronic device is greater than the first battery power threshold, in order to determine whether the battery power of the electronic device can meet the switching of the tuning switch before the electronic device shuts down and the continuous power consumption after the electronic device shuts down, thereby reducing the power consumption of the electronic device. When the battery power of the electronic device is greater than the first battery power threshold, it indicates that the battery power of the electronic device can meet the switching of the tuning switch before the electronic device shuts down and the continuous power consumption after the electronic device shuts down. Therefore, the operations of switching the state of the tuning switch to the first state through the tuning controller and sending a first control instruction to the power manager before the electronic device shuts down can be executed.

[0009] In an implementable manner of the first aspect, the processor is further configured to: when the power of the electronic device is greater than a second power threshold and less than or equal to a first power threshold, before the electronic device shuts down, send a second control instruction to the power manager; the second control instruction is used to instruct that after the electronic device shuts down, the power manager cuts off the power supply of the tuning switch and supplies power to the Bluetooth chip.

[0010] In this implementable manner, since the power of the electronic device is less than or equal to the first power threshold, the power of the electronic device cannot meet the switching of the tuning switch before the electronic device shuts down and the continuous power consumption after the electronic device shuts down. The processor determines whether the power of the electronic device is greater than the second power threshold to determine whether the power of the electronic device can meet the continuous power consumption of the Bluetooth chip after the electronic device shuts down, thereby reducing the power consumption of the electronic device. When the power of the electronic device is greater than the second power threshold, it indicates that the power of the electronic device cannot meet the switching of the tuning switch before the electronic device shuts down and the continuous power consumption after the electronic device shuts down, but can meet the continuous power consumption of the Bluetooth chip after the electronic device shuts down. Therefore, the operation of sending a second control instruction to the power manager to cut off the power supply of the tuning switch and supply power to the Bluetooth chip before the electronic device shuts down can be performed to reduce the power consumption of the electronic device.

[0011] In an implementable manner of the first aspect, the processor is further configured to: when the power of the electronic device is less than or equal to the second power threshold, before the electronic device shuts down, send a third control instruction to the power manager; the third control instruction is used to instruct that after the electronic device shuts down, the power manager cuts off the power supply of the Bluetooth chip and the tuning switch.

[0012] In this implementable manner, since the power of the electronic device is less than or equal to the first power threshold, the power of the electronic device cannot meet the switching of the tuning switch before the electronic device shuts down and the continuous power consumption after the electronic device shuts down. When the power of the electronic device is less than or equal to the second power threshold, it indicates that the power of the electronic device cannot meet the continuous power consumption of the Bluetooth chip after the electronic device shuts down. Therefore, the operation of sending a third control instruction to the power manager to cut off the power supply of both the tuning switch and the Bluetooth chip before the electronic device shuts down can be performed to reduce the power consumption of the electronic device.

[0013] In an implementable manner of the first aspect, the processor is further configured to: obtain the state of the tuning switch through a tuning controller; when the state of the tuning switch is the second state, before the electronic device shuts down, switch the state of the tuning switch to the first state through the tuning controller, and send a first control instruction to the power manager; the second state is used to characterize that the first end and the second end of the tuning switch are disconnected.

[0014] In this implementation manner, the processor determines whether the state of the tuning switch is the second state, in order to judge whether it is necessary to switch the state of the tuning switch to the first state according to this state. When the state of the tuning switch is the second state, it indicates that the tuning switch is not in the Bluetooth frequency band and the corresponding matching impedance. At this time, it is necessary to switch the state of the tuning switch to the first state so that the tuning switch is in the Bluetooth frequency band and the corresponding matching impedance. When the state of the tuning switch is the first state, it indicates that the tuning switch is in the Bluetooth frequency band and the corresponding matching impedance. At this time, it is not necessary to switch the state of the tuning switch to the first state.

[0015] In an implementable manner of the first aspect, the processor is further configured to: when the tuning switch is in the first state, control the tuning switch to operate in the first frequency band through the tuning controller, and control the first impedance matching circuit to conduct.

[0016] In this implementation manner, when the tuning switch is in the first state, the first end and the second end of the tuning switch are conducted, and the tuning switch is in the Bluetooth frequency band and connected to the corresponding matching impedance. In order to keep the Bluetooth antenna working with high efficiency, the tuning controller can be used to control the tuning switch to operate in the first frequency band, so that the Bluetooth antenna operates in the first frequency band, and control the first impedance matching circuit to conduct, so as to match the corresponding impedance.

[0017] In an implementable manner of the first aspect, the first frequency band is the 2.400 GHz - 2.4835 GHz frequency band.

[0018] In this implementation manner, by setting the first frequency band to the 2.400 GHz - 2.4835 GHz frequency band, the tuning switch is in the Bluetooth frequency band of 2.400 GHz - 2.4835 GHz, which can improve the efficiency of the Bluetooth antenna.

[0019] In the second aspect, an antenna tuning method is provided, which is applied to an electronic device. The electronic device includes an antenna; the antenna includes a Bluetooth antenna; the method includes: obtaining the shutdown information of the electronic device; the shutdown information is used to indicate that the electronic device is about to shut down; before the electronic device shuts down, switch the state of the tuning switch to the first state through the tuning controller, and send a first control instruction to the power manager; the first state is used to represent that the first end and the second end of the tuning switch are conducted, the first end of the tuning switch is used to connect to the Bluetooth antenna, and the second end of the tuning switch is used to ground through the first impedance matching circuit; the first control instruction is used to indicate that after the electronic device shuts down, the power manager supplies power to the tuning switch and the Bluetooth chip; the Bluetooth chip is used to transmit radio frequency signals with the Bluetooth antenna.

[0020] In an implementable manner of the second aspect, the method further includes: obtaining the power of the electronic device; when the power of the electronic device is greater than the first power threshold, before the electronic device shuts down, switching the state of the tuning switch to the first state through the tuning controller, and sending a first control instruction to the power manager.

[0021] In an implementable manner of the second aspect, the method further includes: when the power of the electronic device is greater than the second power threshold and less than or equal to the first power threshold, before the electronic device shuts down, sending a second control instruction to the power manager; the second control instruction is used to instruct that after the electronic device shuts down, the power manager cuts off the power supply of the tuning switch and supplies power to the Bluetooth chip.

[0022] In an implementable manner of the second aspect, the method further includes: when the power of the electronic device is less than or equal to the second power threshold, before the electronic device shuts down, sending a third control instruction to the power manager; the third control instruction is used to instruct that after the electronic device shuts down, the power manager cuts off the power supply of the Bluetooth chip and the tuning switch.

[0023] In an implementable manner of the second aspect, the method further includes: obtaining the state of the tuning switch through the tuning controller; when the state of the tuning switch is the second state, according to the shutdown information of the electronic device, switching the state of the tuning switch to the first state through the tuning controller; the second state is used to represent that the first end and the second end of the tuning switch are disconnected.

[0024] In an implementable manner of the second aspect, the method further includes: when the tuning switch is in the first state, controlling the tuning switch to operate in the first frequency band through the tuning controller, and controlling the first impedance matching circuit to conduct.

[0025] In an implementable manner of the second aspect, the first frequency band is the 2.400 GHz - 2.4835 GHz frequency band.

[0026] In a third aspect, an electronic device is provided, including an antenna tuning circuit as in the first aspect and any of its implementation manners, where the antenna tuning circuit is used to switch the antenna state of the electronic device and tune the antenna.

[0027] In a fourth aspect, an electronic device is provided, including: a memory and one or more processors, the memory is coupled to the processors; wherein, the memory is used to store instructions executable by the processors, the memory stores computer program code, and the computer program code includes computer instructions, when the computer instructions are executed by the processors, the electronic device executes the antenna tuning method as in the second aspect and any of its implementation manners.

[0028] In a fifth aspect, a computer-readable storage medium is provided, including computer instructions which, when running on an electronic device, cause the electronic device to execute the antenna tuning method as described in the second aspect and any of its embodiments.

[0029] In a sixth aspect, a computer program product is provided which, when running on an electronic device, causes the electronic device to execute the antenna tuning method as described in the second aspect and any of its embodiments.

[0030] It should be noted that for the technical effects brought about by the design methods of the second, third, fourth, fifth, and sixth aspects, reference may be made to the technical effects brought about by different design methods in the first aspect, which will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 FIG. is a schematic diagram of a possible hardware structure of an electronic device provided by an embodiment of the present application; Figure 2 FIG. is a schematic diagram of the structure of an antenna tuning circuit before an electronic device shuts down provided by the related art; Figure 3 FIG. is a schematic diagram of the structure of an antenna tuning circuit after an electronic device shuts down provided by the related art; Figure 4 FIG. is a schematic diagram of an FMD characteristic provided by the related art; Figure 5 FIG. is a schematic diagram of the wave depth and efficiency of the corresponding antenna when a tuning switch is working properly and not working provided by the related art; Figure 6 FIG. is a schematic diagram of the structure of an antenna tuning circuit before an electronic device shuts down provided by an embodiment of the present application; Figure 7 FIG. is a schematic diagram of the structure of an antenna tuning circuit after an electronic device shuts down provided by an embodiment of the present application; Figure 8 FIG. is a schematic diagram of the structure of an antenna tuning circuit with a 4T switch provided by an embodiment of the present application; Figure 9 FIG. is a schematic diagram of the structure of an antenna tuning circuit including the conduction of a 4T switch and the connection of each port provided by an embodiment of the present application; Figure 10 FIG. is a flowchart of an antenna tuning method provided by an embodiment of the present application; Figure 11 FIG. is a schematic diagram of a possible software structure of an electronic device provided by an embodiment of the present application; Figure 12 FIG. is a schematic diagram of an antenna tuning method combining hardware and software provided by an embodiment of the present application; Figure 13 Schematic diagram of an antenna tuning method combined with a shutdown process provided by an embodiment of the present application. Detailed implementation manners

[0032] The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application. Among them, in the description of the present application, unless otherwise specified, " / " means that the objects associated before and after are in an "or" relationship. For example, A / B may represent A or B; "and / or" in the present application is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. These three situations, where A and B can be singular or plural. Also, in the description of the present application, unless otherwise specified, "a plurality of" means two or more than two. "At least one (item)" or similar expressions thereof refer to any combination of these items, including any combination of single item (s) or plural item (s). For example, at least one (item) of a, b, or c may represent: a, b, c, a - b, a - c, b - c, or a - b - c, where a, b, c can be single or multiple. In addition, in order to clearly describe the technical solutions in the embodiments of the present application, in the embodiments of the present application, terms such as "first" and "second" are used to distinguish the same items or similar items with basically the same functions and roles. Those skilled in the art can understand that the terms "first", "second", etc. do not limit the quantity and execution order, and the terms "first", "second", etc. do not necessarily limit to be different. At the same time, in the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design solution described as "exemplary" or "for example" in the embodiments of the present application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Exactly speaking, using words such as "exemplary" or "for example" aims to present relevant concepts in a specific way for easy understanding. The terms "coupled" and "connected" involved in the embodiments of the present application should be understood in a broad sense. For example, it can refer to a direct physical connection, or an indirect connection realized through electronic devices, such as a connection realized through resistors, inductors, capacitors or other electronic devices.

[0033] Bluetooth is a short - range wireless communication technology used for data transmission and communication between devices.

[0034] A tuning switch is an electronic switch used to adjust circuit parameters, commonly found in radio frequency (RF) and microwave circuits for optimizing signal transmission and reception. The main functions of the tuning switch include frequency tuning, impedance matching, and signal optimization, etc.

[0035] The "Find My Device" (FMD) feature is an important security feature in electronic devices such as mobile phones, which is used to help users locate, lock, or erase the data on the device when the electronic device is lost or stolen.

[0036] Embodiments of this application provide an electronic device, which is an electronic device with radio frequency function. The electronic device can be mobile or fixed. The electronic device can be deployed on land (such as indoors or outdoors, handheld or vehicle-mounted, etc.), on water (such as ships, etc.), or in the air (such as airplanes, balloons, and satellites, etc.). This electronic device can be referred to as user equipment (UE), access terminal, terminal unit, subscriber unit, terminal station, mobile station (MS), mobile phone, terminal agent, or terminal device, etc. For example, the electronic device can be a mobile phone, tablet computer, laptop computer, smart bracelet, smart screen, smart watch, virtual reality (VR) device, augmented reality (AR) device, terminal in industrial control, terminal in self-driving, terminal in remote medical, terminal in smart grid, terminal in transportation safety, terminal in smart city, terminal in smart home, etc. Embodiments of this application do not limit the specific type and structure of the electronic device. A possible structure of the electronic device will be described below.

[0037] Taking the electronic device as a mobile phone as an example, Figure 1Shows a possible structure of the electronic device 100. The electronic device 100 may include a processor 6, an external memory interface 220, an internal memory 221, a universal serial bus (USB) interface 230, a power management module 240, a battery 241, a wireless charging coil 242, a mobile communication module 250, a wireless communication module 260, an antenna tuning circuit 1, an antenna 2, an audio module 270, a speaker 270A, a receiver 270B, a microphone 270C, a headphone interface 270D, a sensor module 280, a button 290, a motor 291, an indicator 292, a camera 293, a display screen 294, and a subscriber identification module (SIM) card interface 295, etc. Optionally, in some embodiments, it further includes an audio digital signal processor (ADSP) 243.

[0038] It can be understood that the structure illustrated in the embodiments of the present application does not constitute a specific limitation on the electronic device 100. In other embodiments of the present application, the electronic device 100 may include more or fewer components than those shown in the figure, or combine certain components, or split certain components, or have different component arrangements. The components shown in the figure may be implemented in hardware, software, or a combination of software and hardware.

[0039] Processor 6 may include one or more processing units. For example, processor 6 may be a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), a system on chip (SoC), a central processing unit (CPU), an application processor (AP), a network processor (NP), a digital signal processor (DSP), a microcontroller unit (MCU), a programmable logic device (PLD), a modem processor, a graphics processing unit (GPU), an image signal processor (ISP), a controller, a video codec, and a neural-network processing unit (NPU), etc. Among them, different processing units may be independent devices or integrated in one or more processors. For example, processor 6 may be an application processor AP. Alternatively, processor 6 may be integrated in a system on chip (SoC). Alternatively, processor 6 may be integrated in an integrated circuit (IC) chip. The processor 6 may include an analog front end (AFE) and a microcontroller unit (MCU) in the IC chip.

[0040] A memory may also be provided in processor 6 for storing computer instructions and data. In some embodiments, the memory in processor 6 is a cache memory. This memory can save the computer instructions or data that processor 6 has just used or recycled. If processor 6 needs to use the computer instructions or data again, it can directly call them from the memory. This avoids repeated access and reduces the waiting time of processor 6, thus improving the efficiency of the system.

[0041] In some embodiments, the processor 6 may include one or more interfaces. The interfaces may include an inter-integrated circuit (I2C) interface, an inter-integrated circuit sound (I2S) interface, a pulse code modulation (PCM) interface, a universal asynchronous receiver / transmitter (UART) interface, a mobile industry processor interface (MIPI), a general-purpose input / output (GPIO) interface, a subscriber identity module (SIM) interface, and / or a USB interface, etc.

[0042] In some embodiments, the processor may be a processor, such as a central processing unit (CPU), a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It can implement or execute various exemplary logic blocks, modules, and circuits described in connection with the present disclosure. The above processor may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, and so on.

[0043] ADSP 243 can be coupled to the audio module 270 and the sensor module 280. ADSP 243 can be used to process audio signals and also process sensor data. When the processor 6 is in the sleep state, ADSP 243 can still remain working, thereby reducing the power consumption of the electronic device 100.

[0044] It can be understood that the interface connection relationships shown in the embodiments of the present application are only illustrative and do not constitute a structural limitation on the electronic device 100. In other embodiments of the present application, the electronic device 100 may also adopt different interface connection methods in the embodiments, or a combination of multiple interface connection methods.

[0045] The external memory interface 220 can be used to connect to an external memory card to expand the storage capacity of the electronic device 100. The external memory card communicates with the processor 6 through the external memory interface 220 to implement the data storage function. For example, files such as music and videos are saved in the external memory card.

[0046] The internal memory 221 can be used to store computer-executable program codes, and the executable program codes include computer instructions. The processor 6 executes various functional applications and data processing of the electronic device 100 by running the computer instructions stored in the internal memory 221. In addition, the internal memory 221 can include a high-speed random access memory, and can also include a non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, a universal flash storage (UFS), etc.

[0047] In the embodiment of the present application, when the computer instructions are executed by the processor 6, the electronic device 100 executes the antenna tuning method in the embodiment of the present application.

[0048] The memory involved in the embodiment of the present application can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memories. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable ROM (PROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), or a flash memory. The volatile memory can be a random access memory (RAM), which is used as an external cache. By way of example but not limitation, many forms of RAM are available, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchlink DRAM (SLDRAM), and direct rambus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but not be limited to, these and any other suitable types of memory.

[0049] The electronic device 100 can implement audio functions through the audio module 270, speaker 270A, receiver 270B, microphone 270C, headphone jack 270D, and application processor, etc. Such as music playback, recording, etc.

[0050] The keys 290 include a power key, volume keys, etc. The keys 290 can be mechanical keys or touch keys. The electronic device 100 can receive key inputs and generate key signal inputs related to the user settings and function controls of the electronic device 100. The motor 291 can generate vibration prompts. The motor 291 can be used for incoming call vibration prompts and can also be used for touch vibration feedback. The indicator 292 can be an indicator light, which can be used to indicate the charging state, power change, and can also be used to indicate messages, missed calls, notifications, etc. The SIM card interface 295 is used to connect the SIM card. The SIM card can be in contact with and separated from the electronic device 100 by inserting or removing it from the SIM card interface 295. The electronic device 100 can support 1 or N SIM card interfaces, where N is a positive integer greater than 1. The SIM card interface 295 can support Nano SIM cards, Micro SIM cards, SIM cards, etc. In some embodiments, the electronic device 100 uses an embedded SIM (eSIM) card, and the eSIM card can be embedded in the electronic device 100 and cannot be separated from the electronic device 100.

[0051] The electronic device 100 can implement a shooting function through the ISP, camera 293, video codec, GPU, display screen 294, and application processor, etc. The ISP is used to process the data fed back by the camera 293. In some embodiments, the ISP can be provided in the camera 293. The camera 293 is used to capture static images or videos. In some embodiments, the electronic device 100 can include 1 or N cameras 293, where N is a positive integer greater than 1.

[0052] The electronic device 100 can implement a display function through the GPU, display screen 294, and application processor, etc. The GPU is a microprocessor for image processing, connecting the display screen 294 and the application processor. The GPU is used to perform mathematical and geometric calculations for graphics rendering. The processor 6 can include one or more GPUs, which execute computer instructions to generate or change display information.

[0053] The power management module 240 is used to receive a charging input from a charger. Among them, the charger can be a wireless charger, such as a wireless charging dock, other electronic devices 100 with reverse wireless charging function, etc. The power management module 240 can receive a wireless charging input through the wireless charging coil 242 of the electronic device. The charger can also be a wired charger. For example, the power management module 240 can receive a charging input from a wired charger through the USB interface 230. The power management module 240 is also called a charging chip.

[0054] The power management module 240 is used to connect to the battery 241. The power management module 240 receives the input of the battery 241 and supplies power to the processor 6, the internal memory 221, the display screen 294, the camera 293, the wireless communication module 260, etc. The power management module 240 can also be used to monitor parameters such as the capacity of the battery 241, the number of battery 241 charge cycles, and the health status (leakage, impedance) of the battery 241. In some other embodiments, the power management module 240 can also be disposed in the processor 6.

[0055] In the embodiments of the present application, the wireless communication function of the electronic device 100 can be implemented through the antenna tuning circuit 1, the antenna 2, the mobile communication module 250, the wireless communication module 260, the modulation and demodulation processor, etc.

[0056] The mobile communication module 250 can provide solutions for wireless communications including 2G / 3G / 4G / 5G, etc. applied to the electronic device 100. The wireless communication module 260 can provide solutions for wireless communications including wireless local area networks (WLAN) (such as wireless fidelity (Wi-Fi) networks), Bluetooth (BT), global navigation satellite system (GNSS), frequency modulation (FM), near field communication (NFC), infrared technology (IR), etc. applied to the electronic device 100.

[0057] In the related art, by way of example, as shown in the appendix Figure 2As shown in the figure, the antenna tuning circuit 1 includes an antenna 2, a tuning switch 3, a power manager 4, a Bluetooth chip 5, and a processor 6. The antenna 2 includes a Bluetooth antenna 21 and a Wifi antenna 22. The Bluetooth antenna 21 is connected to the first end of the tuning switch 3. The power supply terminal of the tuning switch 3 is connected to the power manager 4. The control terminal of the tuning switch 3 is connected to the processor 6. The Bluetooth antenna 21 is also connected to the first end of the Bluetooth chip 5. The second end of the Bluetooth chip 5 is connected to the power manager 4, and the third end of the Bluetooth chip 5 is connected to the processor 6. When the Bluetooth of the electronic device 100 is working properly, the power manager 4 supplies power to the tuning switch 3, the Bluetooth chip 5, and the processor 6. On the one hand, the processor 6 controls the Bluetooth chip 5 to transmit radio frequency signals through the Bluetooth antenna 21. On the other hand, the processor 6 controls the tuning switch 3 to switch states, so that the tuning switch 3 is in the Bluetooth frequency band and the corresponding matching impedance. And because the tuning switch 3 is powered on, the tuning switch 3 is maintained in the Bluetooth frequency band and the corresponding matching impedance, so that the Bluetooth antenna 21 works in the best frequency band of Bluetooth.

[0058] Currently, many electronic devices 100 such as mobile phones support the FMD feature. Exemplarily, as shown in the appendix Figure 3 As shown in the figure, on the one hand, after the electronic device 100 is powered off, the power manager 4 cuts off the power supply to the tuning switch 3 and the processor 6. After the tuning switch 3 and the processor 6 are powered off, the processor 6 cannot control the tuning switch 3 to switch states to make the tuning switch 3 in the Bluetooth frequency band, and cannot control the Bluetooth chip 5. Exemplarily, as shown in the appendix Figure 3 - Appendix Figure 4 As shown in the figure, on the other hand, the power manager 4 continues to supply power to the Bluetooth chip 5. After the electronic device 100 is powered off, the Bluetooth chip 5 continues to work and transmits radio frequency signals through the Bluetooth antenna 21. At this time, other surrounding electronic devices 101 can obtain the location of the electronic device 100 by scanning the radio frequency signals transmitted by the Bluetooth antenna 21 and report it to the cloud to achieve the purpose of finding the electronic device 100.

[0059] Exemplarily, as shown in the appendix Figure 5As shown, when the tuning switch 3 is operating normally, that is, when the electronic device 100 is operating normally and in a state of tuning the Bluetooth antenna 21, the tuning switch 3 is at the Bluetooth frequency band and the corresponding matching impedance, and the power manager 4 supplies power to the tuning switch 3 to keep the tuning switch 3 at the Bluetooth frequency band and the corresponding matching impedance. At this time, the coordinates of point ② are (2.44 GHz, -4.224761 db), that is to say, the efficiency of the Bluetooth antenna 21 at the 2.44 GHz frequency band is -4.224761 db. When the tuning switch 3 is not working, that is, before the electronic device 100 shuts down, the tuning switch 3 is not at the Bluetooth frequency band and the corresponding matching impedance. After the electronic device 100 shuts down, the power manager 4 cuts off the power supply to the tuning switch 3 and the processor 6. The processor 6 cannot switch the state of the tuning switch 3 through the tuning switch 3 to make the tuning switch 3 at the Bluetooth frequency band and the corresponding matching impedance. And because the tuning switch 3 is powered off, it cannot keep the tuning switch 3 at the Bluetooth frequency band and the corresponding matching impedance. At this time, the coordinates of point ① are (2.44 GHz, -12.40478 db), that is to say, the efficiency of the Bluetooth antenna 21 at the 2.44 GHz frequency band is -12.40478 db. It can be seen from this that when the tuning switch 3 is not working, compared with when the tuning switch 3 is working normally, the efficiency of the Bluetooth antenna 21 drops by about 8 db. Therefore, it causes the efficiency of the Bluetooth antenna 21 to drop and the coverage range of the radio frequency signal to be small, resulting in poor FMD performance.

[0060] For this reason, in the embodiments of the present application, an antenna tuning circuit 1 is provided, which can, before the electronic device 100 shuts down, switch the tuning switch 3 to a first state in which the first end and the second end are conducted through the tuning controller, and send a first control instruction to the power manager 4 to supply power to the tuning switch 3 and the Bluetooth chip 5 after the electronic device 100 shuts down. Therefore, it can switch the state of the tuning switch 3 to the Bluetooth frequency band and connect the corresponding matching impedance before the electronic device 100 shuts down, and keep the tuning switch 3 at the Bluetooth frequency band and the corresponding matching impedance after the electronic device 100 shuts down, improving the efficiency of the Bluetooth antenna 21, increasing the coverage range of the radio frequency signal, and thus improving the FMD performance.

[0061] The antenna tuning circuit provided by the embodiments of the present application can be the antenna tuning circuit 1 in the electronic device 100 as shown in the appendix Figure 1 The antenna can be the antenna 2 in the electronic device 100 as shown in the appendix Figure 1 Taking the electronic device 100 including the antenna tuning circuit 1 as an example, the antenna tuning circuit 1 of the present application is specifically described in the embodiments of the present application.

[0062] Exemplarily, as shown in the appendix Figure 6 The antenna tuning circuit 1 is applied to the electronic device 100. The antenna tuning circuit 1 is connected to the antenna 2. The antenna tuning circuit 1 is compared with the appendixFigure 2 The antenna tuning circuit in the related art shown also includes a tuning controller 7. The control end of the tuning switch 3 is connected to the tuning controller 7. The second end of the tuning switch 3 is grounded through a first impedance matching circuit 31. The tuning controller 7 is connected to the processor 6.

[0063] The processor 6 is configured to: obtain shutdown information for indicating that the electronic device 100 is about to shut down. Before the electronic device 100 shuts down, switch the tuning switch 3 to the first state through the tuning controller 7, and send a first control instruction to the power manager 4.

[0064] Wherein, the first state is used to represent that the first end and the second end of the tuning switch 3 are conducting; the first control instruction is used to instruct that after the electronic device 100 shuts down, the power manager 4 supplies power to the tuning switch 3 and the Bluetooth chip 5.

[0065] In a possible implementation, the antenna 2 can be a patch antenna, or a dipole antenna or a chip antenna, etc. The embodiments of the present application do not limit the type of the antenna 2.

[0066] In a possible implementation, the antenna 2 can include a Bluetooth antenna 21, and can also include a Wifi antenna 22, and can also include a zigbee antenna. The embodiments of the present application do not limit the types of the antenna 2.

[0067] In a possible implementation, the tuning switch 3 can be a single-pole double-throw switch, or a relay switch, or a single-pole multi-throw switch. The embodiments of the present application do not limit the type of the tuning switch 3.

[0068] In the embodiments of the present application, the tuning controller 7, the Bluetooth chip 5 and the processor 6 are independent of each other. The tuning controller 7 can be integrated on a radio frequency chip. The processor 6 can be integrated on a system on chip (SOC). The Bluetooth chip 5 can be integrated on a separate chip different from the SOC and the radio frequency chip.

[0069] As attached Figure 6 The working principle of the antenna tuning circuit 1 in the embodiments of the present application shown is as follows: After the electronic device 100 is powered off, in addition to supplying power to the Bluetooth chip 5, the power manager 4 cuts off the power supply to the tuning switch 3, the processor 6, and the tuning controller 7. In order to prevent the state of the tuning switch 3 from being unable to be switched to the Bluetooth frequency band and the corresponding matching impedance after the power manager 4 cuts off the power supply to the tuning switch 3 and the processor 6, the processor 6 obtains the power-off information that the electronic device 100 is about to be powered off. Before the electronic device 100 is powered off, the tuning switch 3 is switched to the first state where the first end and the second end are conducted through the tuning controller 7, that is, the state of the tuning switch 3 is switched to the Bluetooth frequency band and the corresponding matching impedance, so that the tuning switch 3 is in the Bluetooth frequency band and the corresponding matching impedance before the electronic device 100 is powered off. And a first control instruction for the power manager 4 to supply power to the tuning switch 3 and the Bluetooth chip 5 after the electronic device 100 is powered off is sent to the power manager 4. Exemplarily, as shown in the appendix Figure 7 As shown, after the electronic device 100 is powered off, although the power manager 4 cuts off the power supply to the tuning controller 7 and the processor 6, resulting in the processor 6 being unable to control the tuning switch 3 to switch states through the tuning controller 7 and unable to control the Bluetooth chip 5. However, the power manager 4 continues to supply power to the tuning switch 3 and the Bluetooth chip 5, so that the tuning switch 3 can continue to stay in the Bluetooth frequency band and the corresponding matching impedance after the electronic device 100 is powered off because it is still powered. That is to say, the tuning switch 3 works normally, and the Bluetooth antenna 21 always works at 2.4 GHz, thus maintaining high-efficiency operation. Therefore, the efficiency of the Bluetooth antenna 21 can be improved (for example, the efficiency of the Bluetooth antenna 21 is increased from -12.40478 db to -4.224761 db), and the coverage range of the radio frequency signal can be increased (for example, the coverage range is increased from 2 to 3 meters to 6 to 8 meters), thereby improving the FMD performance.

[0070] In a possible implementation, the tuning switch 3 can be a single-pole double-throw switch, a relay switch, or a single-pole multi-throw switch. The embodiments of the present application do not limit the type of the tuning switch 3.

[0071] In a possible implementation, the single-pole multi-throw switch can be a single-pole triple-throw switch, that is, a 3T switch, or a single-pole quadruple-throw switch, that is, a 4T. The embodiments of the present application do not limit the type of the single-pole multi-throw switch.

[0072] In the following embodiments of the present application, taking the single-pole multi-throw switch as a 4T switch as an example, the antenna tuning circuit 1 of the present application is specifically described.

[0073] Exemplarily, as shown in the appendix Figure 8 As shown, the tuning switch 3 includes a first end (ANT end), an RF1 end, an RF2 end, an RF3 end, an RF4 end, a first ground end (GND1 end), a power supply end (VIO end), a control end, an address end (IDO end), and a second ground end (GND2 end).

[0074] Among them, the ANT terminal is used to connect to antenna 2. The RF1 terminal, RF2 terminal, RF3 terminal, and RF4 terminal are used to conduct with the ANT terminal respectively, corresponding to four different frequency bands. The GND1 terminal and GND2 terminal are used for grounding. The VIO terminal is used to connect to the power supply to input the power supply voltage VDD. The control terminal is a serial interface, including the SCLK terminal and the SDATA terminal. The SCLK terminal is used to input the clock signal, and the SDATA terminal is used to input the data signal. The IDO terminal is used to input the address to identify different models of the tuning switch 3.

[0075] In the embodiment of the present application, the second terminal can be the RF1 terminal, or the RF2 terminal, or the RF3 terminal, or the RF4 terminal. The embodiment of the present application does not limit the port of the second terminal.

[0076] In the following embodiments of the present application, taking the second terminal as the RF1 terminal as an example, the antenna tuning circuit 1 of the present application will be specifically described.

[0077] Exemplarily, as shown in the appendix Figure 9 In the embodiment of the present application, the ANT terminal is connected to the Bluetooth antenna 21. The RF1 terminal is grounded through the first impedance matching circuit 31. The RF2 terminal is grounded through the second impedance matching circuit 32. The RF3 terminal is grounded through the third impedance matching circuit 33. The RF4 terminal is grounded through the fourth impedance matching circuit 34. The VIO terminal is connected to the power manager 4. The SCLK terminal and the SDATA terminal are respectively connected to the tuning controller 7. The connection relationships of other devices of the antenna tuning circuit 1 are the same as those in the appendix Figure 6 - appendix Figure 8 and will not be elaborated here.

[0078] As shown in the appendix Figure 9 The working principle of the antenna tuning circuit 1 in the embodiment of the present application is as follows: When the tuning switch 3 is operating, the power manager 4 supplies power to the tuning switch 3. When the ANT terminal is conducting with the RF1 terminal, the tuning switch 3 is in the first state, and the tuning switch 3 is in the first frequency band, enabling the Bluetooth antenna 21 to operate in the first frequency band. For example, the first state enables the Bluetooth antenna 21 to operate in the Bluetooth frequency band of 2.400 GHz to 2.4835 GHz, and the tuning controller 7 can control the first impedance matching circuit 31 to conduct through the tuning switch 3 to match the corresponding impedance. When the ANT terminal is conducting with the RF2 terminal, the tuning switch 3 is in the second state, and the tuning switch 3 is in the second frequency band, enabling the Bluetooth antenna 21 to operate in the second frequency band. For example, the second state enables the Bluetooth antenna 21 to operate in the first Wifi frequency band of 4.915 GHz to 5.825 GHz, and the tuning controller 7 can control the second impedance matching circuit 32 to conduct through the tuning switch 3 to match the corresponding impedance. When the ANT terminal is conducting with the RF3 terminal, the tuning switch 3 is in the third state, and the tuning switch 3 is in the third frequency band, enabling the Bluetooth antenna 21 to operate in the third frequency band. For example, the third state enables the Bluetooth antenna 21 to operate in the second Wifi frequency band of 5.925 GHz to 7.125 GHz, and the tuning controller 7 can control the third impedance matching circuit 33 to conduct through the tuning switch 3 to match the corresponding impedance. When the ANT terminal is conducting with the RF4 terminal, the tuning switch 3 is in the fourth state, and the tuning switch 3 is in the fourth frequency band, and the Bluetooth antenna 21 operates in the fourth frequency band. For example, the fourth state enables the Bluetooth antenna 21 to operate in the zigbee frequency band of 868 MHz, and the tuning controller 7 can control the fourth impedance matching circuit 34 to conduct through the tuning switch 3 to match the corresponding impedance.

[0079] Furthermore, during the process that the power manager 4 continuously supplies power to the tuning switch 3, the VIO terminal of the tuning switch 3 is always powered on, which can maintain the state of the tuning switch 3. For example, after the tuning switch 3 is switched to the first state, the power manager 4 continuously supplies power to the tuning switch 3, and the VIO terminal is always powered on, then the tuning switch 3 is maintained in the first state. When the power manager 4 cuts off the power supply to the tuning switch 3, the tuning switch 3 cannot be maintained in the first state.

[0080] In the embodiment of the present application, by way of example, refer to the appendix Figure 9, before the electronic device 100 is powered off, the processor 6 switches the tuning switch 3 to conduct between the ANT terminal and the RF1 terminal through the tuning controller 7. At this time, the tuning switch 3 is in the first state, and the tuning switch 3 is on the Bluetooth frequency band and the corresponding matching impedance. And the processor 6 sends a first control instruction to the power manager 4 through the tuning controller 7. After the electronic device 100 is powered off, the power manager 4 supplies power to the tuning switch 3 and the Bluetooth chip 5 according to the first control instruction. The power manager 4 supplies power to the tuning switch 3 to make the tuning switch 3 charged after the electronic device 100 is powered off and still maintain the state before the electronic device 100 is powered off. The power manager 4 supplies power to the Bluetooth chip 5 to enable the Bluetooth antenna 21 to still emit radio frequency signals after the electronic device 100 is powered off, so that other surrounding electronic devices 101 can still scan the radio frequency signals emitted by the Bluetooth antenna 21. After the electronic device 100 is powered off, since the power manager 4 still supplies power to the tuning switch 3, the tuning switch 3 can be maintained in the first state, so as to ensure that the Bluetooth antenna 21 operates in the optimal frequency band of Bluetooth, that is, the 2.400 GHz to 2.4835 GHz frequency band, so as to maintain high-efficiency operation. Therefore, the efficiency of the Bluetooth antenna 21 can be improved, the coverage range of the radio frequency signal can be increased, and the FMD performance can be improved.

[0081] In a possible implementation manner, when the tuning switch 3 is in the first state, the processor 6 controls the tuning switch 3 to operate in the first frequency band through the tuning controller 7, and controls the first impedance matching circuit 31 to conduct. In a possible implementation manner, the first frequency band is the 2.400 GHz to 2.4835 GHz frequency band.

[0082] When the tuning switch 3 is in the first state, the ANT terminal and the RF1 terminal of the tuning switch 3 are conducted, and the tuning switch 3 is on the Bluetooth frequency band and the corresponding matching impedance. Therefore, it is necessary to control the tuning switch 3 to operate in the Bluetooth frequency band of the first frequency band, so that the Bluetooth antenna 21 operates in the Bluetooth frequency band. And control the first impedance matching circuit 31 to conduct to match the corresponding impedance, so that the Bluetooth antenna 21 maintains high-efficiency operation.

[0083] To solve the above problems, the embodiment of the present application also provides an antenna tuning method. Similarly, it can switch the state of the tuning switch 3 to the Bluetooth frequency band and connect the corresponding matching impedance before the electronic device 100 is powered off, and keep the tuning switch 3 in the Bluetooth communication frequency band and the corresponding matching impedance after the electronic device 100 is powered off, improving the efficiency of the Bluetooth antenna 21 and increasing the coverage range of the radio frequency signal, thereby improving the FMD performance. The embodiment of the present application takes the electronic device 100 including the antenna tuning method as an example to specifically illustrate the antenna tuning method of the present application.

[0084] Exemplarily, as shown in the appendix Figure 10As shown in the figure, an antenna tuning method provided by an embodiment of the present application is applied to an electronic device 100. The electronic device 100 includes an antenna 2, and the antenna 2 includes a Bluetooth antenna 21. The processor 6 is used to execute the antenna tuning method. Among them, the connection relationships of the Bluetooth antenna 21, the tuning switch 3, the power manager 4, the tuning controller 7, the Bluetooth chip 5, and the processor 6 are the same as those in the antenna tuning circuit 1 described above, and will not be elaborated here. The antenna tuning method may include steps S1001 - S1011: Step S1001, the processor 6 obtains the shutdown information of the electronic device 100.

[0085] Among them, the shutdown information is used to indicate that the electronic device 100 is about to shut down. The processor 6 obtains the shutdown information that the electronic device 100 is about to shut down, in order to, before the electronic device 100 shuts down, execute the steps of switching the tuning switch 3 and / or sending a control instruction to the power manager 4 according to the state of the tuning switch 3 and the power of the electronic device 100, so that after the electronic device 100 shuts down, the Bluetooth antenna 21 still operates in the first frequency band of 2.400 GHz to 2.4835 GHz.

[0086] Step S1002, the processor 6 obtains the state of the tuning switch 3 through the tuning controller 7.

[0087] Among them, the state of the tuning switch 3 includes a first state and a second state. The first state is used to represent that the ANT terminal of the tuning switch 3 is conducted with the RF1 terminal, that is, the tuning switch 3 is in the Bluetooth frequency band and the corresponding matching impedance. The second state is used to represent that the ANT terminal of the tuning switch 3 is disconnected from the RF1 terminal, that is, the tuning switch 3 is not in the Bluetooth frequency band and the corresponding matching impedance, but in other frequency bands and the corresponding matching impedance. For example, the ANT terminal is conducted with the RF2 terminal or the RF3 terminal or the RF4 terminal, and the tuning switch 3 is in the first Wifi frequency band or the second Wifi frequency band or the zigbee frequency band, so that the Bluetooth antenna 21 operates in the corresponding first Wifi frequency band or the second Wifi frequency band or the zigbee frequency band.

[0088] The processor 6 obtains the state of the tuning switch 3 through the tuning controller 7 in order to execute step S1003 to determine what state the tuning switch 3 is in before the electronic device 100 shuts down.

[0089] Step S1003, the processor 6 determines whether the state of the tuning switch 3 is the second state.

[0090] The processor 6 determines whether the state of the tuning switch 3 is the second state, in order to determine whether to switch the state of the tuning switch 3 to the first state according to this state. When the state of the tuning switch 3 is the second state, it indicates that the tuning switch 3 is not on the Bluetooth frequency band and the corresponding matching impedance. At this time, step S1005 needs to be executed for further judgment, so as to switch the state of the tuning switch 3 to the first state, so that the tuning switch 3 is on the Bluetooth frequency band and the corresponding matching impedance. When the state of the tuning switch 3 is the first state, it indicates that the tuning switch 3 is on the Bluetooth frequency band and the corresponding matching impedance. At this time, it is not necessary to switch the state of the tuning switch 3 to the first state, and step S1004 is executed.

[0091] In step S1004, the processor 6 sends a first control instruction to the power manager 4.

[0092] When the state of the tuning switch 3 is the first state, it indicates that the tuning switch 3 is on the Bluetooth frequency band and the corresponding matching impedance. At this time, the tuning switch 3 is already in the first state and there is no need to switch the state of the tuning switch 3 to the first state again. Therefore, only a first control instruction for powering the tuning switch 3 and the Bluetooth chip 5 through the power manager 4 after the electronic device 100 is shut down needs to be sent to the power manager 4. In this way, after the electronic device 100 is shut down, the tuning switch 3 remains in the first state due to being powered, so that the tuning switch 3 is always on the Bluetooth frequency band and the corresponding matching impedance, and the Bluetooth chip 5 can continuously transmit radio frequency signals through the Bluetooth antenna 21 due to being powered, so that other surrounding electronic devices 101 can still scan the radio frequency signals emitted by the Bluetooth antenna 21.

[0093] In step S1005, the processor 6 obtains the power of the electronic device 100.

[0094] After the processor 6 determines the state of the tuning switch 3, it obtains the power of the electronic device 100, in order to determine whether the power of the electronic device 100 can meet the requirements of the switching of the tuning switch 3 before the electronic device 100 is shut down and the continuous power consumption after the electronic device 100 is shut down, and the continuous power consumption of the Bluetooth chip 5 after the electronic device 100 is shut down. Then, according to this power, the power manager 4 supplies power to the tuning switch 3 and the Bluetooth chip 5 correspondingly after the electronic device 100 is shut down, thereby reducing the power consumption of the electronic device 100.

[0095] In step S1006, the processor 6 determines whether the power of the electronic device 100 is greater than the first power threshold.

[0096] Among them, the first power threshold is the threshold of the power of the electronic device 100 that cannot meet the switching of the tuning switch 3 before the electronic device 100 shuts down and the continuous power consumption after the electronic device 100 shuts down, and can be set according to actual needs. For example, it can be obtained by statistically analyzing multiple powers of the electronic device 100 that cannot meet the switching of the tuning switch 3 before the electronic device 100 shuts down and the continuous power consumption after the electronic device 100 shuts down, such as the mean or median or minimum or maximum value of multiple powers of the electronic device 100 that cannot meet the switching of the tuning switch 3 before the electronic device 100 shuts down and the continuous power consumption after the electronic device 100 shuts down; it can also be set according to empirical values, such as 10% power.

[0097] The processor 6 determines whether the power of the electronic device 100 is greater than the first power threshold, in order to determine whether the power of the electronic device 100 can meet the switching of the tuning switch 3 before the electronic device 100 shuts down and the continuous power consumption after the electronic device 100 shuts down, thereby reducing the power consumption of the electronic device 100. When the power of the electronic device 100 is greater than the first power threshold, it indicates that the power of the electronic device 100 can meet the switching of the tuning switch 3 before the electronic device 100 shuts down and the continuous power consumption after the electronic device 100 shuts down. At this time, when the switching condition of the tuning switch 3 is met, that is, the state of the tuning switch 3 is the second state, step S1007 is executed. When the power of the electronic device 100 is less than or equal to the first power threshold, it indicates that the power of the electronic device 100 cannot meet the switching of the tuning switch 3 before the electronic device 100 shuts down and the continuous power consumption after the electronic device 100 shuts down. At this time, when the switching condition of the tuning switch 3 is met, that is, the state of the tuning switch 3 is the second state, further judgment is required, and step S1008 is executed.

[0098] Step S1007, before the electronic device 100 shuts down, the processor 6 switches the state of the tuning switch 3 to the first state through the tuning controller 7, and sends a first control instruction to the power manager 4.

[0099] When the power of the electronic device 100 is greater than the first power threshold, it indicates that the power of the electronic device 100 can meet the switching of the tuning switch 3 before the electronic device 100 shuts down and the continuous power consumption after the electronic device 100 shuts down. At this time, when the switching condition of the tuning switch 3 is met, that is, the state of the tuning switch 3 is the second state, it can not only control the tuning switch 3 to switch through the tuning controller 7 before the electronic device 100 shuts down, but also supply power to the tuning switch 3 and the Bluetooth chip 5 through the power manager 4 after the electronic device 100 shuts down. That is to say, before the electronic device 100 shuts down, the processor 6 switches the state of the tuning switch 3 to the first state through the tuning controller 7, and sends a first control instruction to the power manager 4 to supply power to the tuning switch 3 and the Bluetooth chip 5 through the power manager 4 after the electronic device 100 shuts down.

[0100] Step S1008, the processor 6 determines whether the power of the electronic device 100 is greater than a second power threshold.

[0101] The second power threshold is the threshold of the power of the electronic device 100 that cannot meet the continuous power consumption of the Bluetooth chip 5 after the electronic device 100 is powered off, and can be set according to actual needs. For example, it can be obtained by statistically analyzing multiple powers of the electronic device 100 that cannot meet the continuous power consumption of the Bluetooth chip 5 after the electronic device 100 is powered off, such as the mean or median or minimum or maximum value of multiple powers of the electronic device 100 that cannot meet the continuous power consumption of the Bluetooth chip 5 after the electronic device 100 is powered off; it can also be set according to an empirical value, such as 3% power.

[0102] The processor 6 determines whether the power of the electronic device 100 is greater than the second power threshold to determine whether the power of the electronic device 100 can meet the continuous power consumption of the Bluetooth chip 5 after the electronic device 100 is powered off, thereby reducing the power consumption of the electronic device 100. When the power of the electronic device 100 is greater than the second power threshold, it indicates that the power of the electronic device 100 can meet the continuous power consumption of the Bluetooth chip 5 after the electronic device 100 is powered off. At this time, when the tuning switch 3 switching condition is met, that is, the state of the tuning switch 3 is the second state, step S1009 is executed. When the power of the electronic device 100 is less than or equal to the second power threshold, it indicates that the power of the electronic device 100 cannot meet the continuous power consumption of the Bluetooth chip 5 after the electronic device 100 is powered off. At this time, when the tuning switch 3 switching condition is met, that is, the state of the tuning switch 3 is the second state, step S1010 is executed.

[0103] Step S1009, before the electronic device 100 is powered off, send a second control instruction to the power manager 4.

[0104] Since the power of the electronic device 100 is less than or equal to the first power threshold, the power of the electronic device 100 cannot meet the switching of the tuning switch 3 before the electronic device 100 shuts down and the continuous power consumption after the electronic device 100 shuts down. When the power of the electronic device 100 is greater than the second power threshold, it indicates that although the power of the electronic device 100 cannot meet the switching of the tuning switch 3 before the electronic device 100 shuts down and the continuous power consumption after the electronic device 100 shuts down, it can meet the continuous power consumption of the Bluetooth chip 5 after the electronic device 100 shuts down. At this time, when the switching condition of the tuning switch 3 is met, that is, the state of the tuning switch 3 is the second state, the Bluetooth chip 5 can be powered only by the power manager 4 after the electronic device 100 shuts down. That is to say, before the electronic device 100 shuts down, a second control instruction is sent to the power manager 4 to cut off the power supply to the tuning switch 3 and supply power to the Bluetooth chip 5 through the power manager 4 after the electronic device 100 shuts down, thereby reducing the power consumption of the electronic device 100.

[0105] Step S1010, before the electronic device 100 shuts down, send a third control instruction to the power manager 4.

[0106] Since the power of the electronic device 100 is less than or equal to the first power threshold, the power of the electronic device 100 cannot meet the switching of the tuning switch 3 before the electronic device 100 shuts down and the continuous power consumption after the electronic device 100 shuts down. When the power of the electronic device 100 is less than or equal to the second power threshold, it indicates that the power of the electronic device 100 can neither meet the switching of the tuning switch 3 before the electronic device 100 shuts down and the continuous power consumption after the electronic device 100 shuts down, nor can it meet the continuous power consumption of the Bluetooth chip 5 after the electronic device 100 shuts down. At this time, when the switching condition of the tuning switch 3 is met, that is, the state of the tuning switch 3 is the second state, the power supply to both the tuning switch 3 and the Bluetooth chip 5 can be cut off through the power manager 4 after the electronic device 100 shuts down. That is to say, before the electronic device 100 shuts down, a third control instruction is sent to the power manager 4 to cut off the power supply to the tuning switch 3 and the Bluetooth chip 5 through the power manager 4 after the electronic device 100 shuts down, thereby reducing the power consumption of the electronic device 100.

[0107] Step S1011, after the electronic device 100 shuts down, the power manager 4 supplies power to the tuning switch 3 and the Bluetooth chip 5 according to the first control instruction; or; the power manager 4 cuts off the power supply to the tuning switch 3 and supplies power to the Bluetooth chip 5 according to the second control instruction; or; the power manager 4 cuts off the power supply to the tuning switch 3 and the Bluetooth chip 5 according to the third control instruction.

[0108] The antenna tuning method described in the above steps S1001 - S1010 is that the processor 6, under the condition of judging the state of the tuning switch 3 and the power of the electronic device 100, sends the first or second or third control instruction to the power manager 4 respectively before the electronic device 100 shuts down for different combinations that meet the conditions. Therefore, after the electronic device 100 shuts down, the power manager 4 supplies power to the tuning switch 3 and the Bluetooth chip 5 according to the first control instruction sent above; or; the power manager 4 cuts off the power of the tuning switch 3 and supplies power to the Bluetooth chip 5 according to the second control instruction sent above; or; the power manager 4 cuts off the power of the tuning switch 3 and the Bluetooth chip 5 according to the third control instruction sent above.

[0109] The antenna tuning method described in the above steps S1001 - S1011 is that after the processor 6 obtains the shutdown information of the electronic device 100, when the state of the tuning switch 3 is the second state and the power of the electronic device 100 is greater than the first power threshold, before the electronic device 100 shuts down, the tuning controller 7 is used to switch the tuning switch 3 to the first state, and a first control instruction for the power manager 4 to supply power to the tuning switch 3 and the Bluetooth chip 5 after the electronic device 100 shuts down is sent. So that before the electronic device 100 shuts down, the tuning switch 3 is at the Bluetooth frequency band and the corresponding matching impedance, and after the electronic device 100 shuts down, the tuning switch 3 remains at the Bluetooth frequency band and the corresponding matching impedance, thereby maintaining high - efficiency operation. Therefore, the efficiency of the Bluetooth antenna 21 can be improved, the coverage range of the radio frequency signal can be increased, and thus the FMD performance can be improved. And the processor 6 can send different control instructions to the power manager 4 before the electronic device 100 shuts down according to the power of the electronic device 100. After the electronic device 100 shuts down, the power manager 4 takes different power supply measures for the tuning switch 3 and the Bluetooth chip 5 according to the control instructions sent above, thereby reducing the power consumption of the electronic device 100.

[0110] The above antenna tuning method can also be implemented through the software layer of the electronic device 100. Exemplarily, as shown in the appendix Figure 11 Taking the electronic device 100 running the Android operating system as an example, the software architecture of the electronic device 100 includes an application layer, a framework layer, a system runtime library layer, a hardware abstraction layer (HAL), and a kernel layer.

[0111] The kernel layer is the layer between hardware and software. Exemplarily, the kernel layer includes a display driver, a camera driver, and a radio frequency driver, etc. The display driver is used to drive the display screen to display images or receive the touch operations of the user, the camera driver is used to drive the camera to collect image data, and the radio frequency driver is used to drive the antenna tuning circuit.

[0112] In the embodiment of the present application, the RF driver is used to drive the antenna tuning circuit 1 to output a RF signal through the antenna 2.

[0113] The HAL layer is used to abstract the hardware. The HAL layer hides the hardware interface details of a specific platform and provides a virtual hardware platform for the operating system, which is hardware-independent. For example, the HAL layer includes a display module, a camera module, and a radio frequency module. The display module is used for a virtual display screen, the camera module is used for a virtual camera, and the radio frequency module is used for a virtual antenna tuning circuit.

[0114] The system runtime layer includes C / C++ program libraries and runtime libraries. Many core components and services of the Android operating system are built from native code and need to be written in C and C++ as C / C++ program libraries. When an application is installed for the first time, it will be pre-compiled into a runtime library in the form of machine code. This process is called pre-compilation. In this way, when the application is started and executed, it can be accelerated by running the machine code.

[0115] The framework layer provides application programming interfaces (APIs) and programming frameworks for applications in the application layer. The framework layer includes some predefined implementation methods. For example, the framework layer includes window managers, content providers, view systems, notification managers, and mobile industry processor interface (MIPI) managers.

[0116] The application layer can include a series of application packages, such as photo, camera and other applications (application, app).

[0117] In combination with the hardware and software structure of the electronic device 100, for example, as shown in the attached Figure 12As shown, the above antenna tuning method, first, the electronic device 100 responds to the shutdown event, and the processor 6 obtains the shutdown information corresponding to the shutdown event. Among them, the shutdown event can be a shutdown event of the power button on the hardware, or it can be a shutdown event of screen sliding, screen clicking, etc. on the software. Secondly, at the kernel layer, the processor 6 transmits a synchronous signal to the tuning controller 7 through the synchronous serial communication protocol (serial peripheral interface, SPI) of the synchronous drive in the radio frequency drive according to the shutdown information, and transmits an asynchronous signal to the tuning controller 7 through the asynchronous serial communication protocol (universal asynchronous receiver transmitter, UART) of the asynchronous drive in the radio frequency drive. Thirdly, after receiving the synchronous signal and the asynchronous signal, the tuning controller 7 sends a clock signal and a data signal to the SCLK terminal and the SDATA terminal of the tuning switch 3 respectively through the MIPI manager of the HAL layer. Finally, the tuning switch 3 switches the state according to the received clock signal and data signal, that is, controls the ANT terminal and the RF1 terminal to be turned on, so that the tuning switch 3 is in the Bluetooth frequency band and the corresponding matching impedance.

[0118] Furthermore, the shutdown of the electronic device 100 is implemented through a software system, and in the software implementation process, from the desktop to the shutdown, a series of software processes need to be closed, and different processes correspond to different shutdown process stages, and different shutdown process stages correspond to the shutdown of different layers of the software system. The embodiment of the present application combines software and hardware, taking the shutdown flowchart as an example, corresponding to each layer in the shutdown process in the software, and the tuning switch 3 and Bluetooth antenna 21 in the hardware, exemplarily illustrates the above-mentioned antenna tuning method. Exemplarily, as shown in the attached Figure 13 As shown, the antenna tuning method includes the following steps: Step 1: At the kernel layer, register the callback function when booting.

[0119] The power-on registration callback function refers to registering the reboot callback function in the kernel layer during the power-on process of the electronic device 100. This step is to facilitate calling the reboot callback function when the electronic device 100 is turned off, so as to perform subsequent steps. Since the kernel layer is a layer between hardware and software, including some drivers, the registration of the reboot callback function is completed in the kernel layer during the power-on process.

[0120] Step ②: At the kernel layer, shutdown calls the callback function.

[0121] The shutdown call-back function means that during the shutdown process of the electronic device 100, a reboot call-back function is registered at the kernel layer. After detecting the shutdown event, first perform the shutdown operation software-wise, and the electronic device 100 executes the shutdown process. After the processor 6 obtains the shutdown information, at the kernel layer, the reboot call-back function is called through the reboot module. Since the kernel layer is the layer between hardware and software and includes some drivers, therefore, during the shutdown process, the call of the reboot call-back function is also completed at the kernel layer.

[0122] Step ③: Broadcast the shutdown information at the kernel layer.

[0123] In Step ①, the user has selected the shutdown operation. In Step ②, the reboot call-back function has been called. At this time, it is necessary to respond to the user's shutdown operation and broadcast the shutdown information at the kernel layer to complete the subsequent shutdown process and antenna tuning method. Since the kernel layer is the layer between hardware and software and includes some drivers, therefore, the work of broadcasting the shutdown information is performed at the kernel layer.

[0124] Step ④: The tuning controller 7 executes the antenna tuning method.

[0125] After receiving the broadcast shutdown information, the tuning controller 7 executes the above-mentioned antenna tuning method according to the shutdown information.

[0126] Step ⑤: The tuning switch 3 switches to the first state.

[0127] In response to the execution of the above-mentioned antenna tuning method, before the electronic device 100 shuts down, the tuning controller 7 switches the tuning switch 3 to the first state where the ANT terminal and the RF1 terminal are conducting, so that the tuning switch 3 is at the Bluetooth frequency band and the corresponding matching impedance.

[0128] Step ⑥: The Bluetooth antenna 21 operates in the first frequency band and emits radio frequency signals.

[0129] During the process of executing the above-mentioned antenna tuning method, before the electronic device 100 shuts down, the processor 6 also sends a first control instruction to the power manager 4. Since the first control instruction is for the power manager 4 to supply power to the tuning switch 3 and the Bluetooth chip 5 after the electronic device 100 shuts down. After the tuning switch 3 is at the Bluetooth frequency band and the corresponding matching impedance in Step ⑤, after the electronic device 100 shuts down, since the tuning switch 3 is powered, the tuning switch 3 can remain at the Bluetooth frequency band, that is, operate in the first frequency band, and at the corresponding matching impedance. And since the Bluetooth chip 5 is powered, the Bluetooth chip 5 can continuously emit radio frequency signals through the Bluetooth antenna 21.

[0130] In the embodiments of the present application, the provided antenna tuning circuit, method, and electronic device can, after obtaining the shutdown information of the electronic device, when the state of the tuning switch is the second state and the power of the electronic device is greater than the first power threshold, before the electronic device shuts down, switch the tuning switch to the first state through the tuning controller, and send a first control instruction to the power manager to supply power to the tuning switch and the Bluetooth chip after the electronic device shuts down. This enables the tuning switch to be on the Bluetooth frequency band and the corresponding matching impedance before the electronic device shuts down, and remain on the Bluetooth frequency band and the corresponding matching impedance after the electronic device shuts down, thereby enabling the Bluetooth antenna to operate with high efficiency. Therefore, the efficiency of the Bluetooth antenna can be improved, the coverage range of the radio frequency signal can be increased, and the FMD performance can be improved. Moreover, the processor can send different control instructions to the power manager before the electronic device shuts down according to the power of the electronic device, and after the electronic device shuts down, the power manager takes different power supply measures for the tuning switch and the Bluetooth chip according to the above-sent control instructions, thereby reducing the power consumption of the electronic device.

[0131] It can be understood that, in order to implement the above functions, the electronic device includes the corresponding hardware and / or software modules for executing each function. Combining the algorithm steps of each example described in the embodiments disclosed in this article, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application in combination with the embodiments, but such implementation should not be considered to exceed the scope of the present application.

[0132] In this embodiment, the electronic device can be divided into functional modules according to the above method examples. For example, each functional module can be divided corresponding to each function, or two or more functions can be integrated into one processing module. The above integrated module can be implemented in the form of hardware. It should be noted that the division of modules in this embodiment is illustrative, only a logical function division, and there can be other division methods in actual implementation.

[0133] The embodiments of the present application also provide a computer-readable storage medium, in which computer program code is stored. When the above processor executes the computer program code, the electronic device executes the relevant method steps in the above method embodiments.

[0134] The embodiments of the present application also provide a computer program product. When the computer program product runs on a computer, the computer executes the relevant method steps in the above method embodiments.

[0135] Among them, the electronic device, computer storage medium, or computer program product provided in this application is used to execute the corresponding method provided above. Therefore, the beneficial effects it can achieve can refer to the beneficial effects in the corresponding method provided above, and will not be elaborated here.

[0136] Through the description of the above embodiments, those skilled in the art can clearly understand that for the convenience and conciseness of description, only the above division of each functional module is used as an example. In actual applications, the above functions can be allocated to different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above.

[0137] In several embodiments provided in this application, it should be understood that the disclosed device and method can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the above division of modules or units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point, the displayed or discussed mutual coupling or direct coupling or communication connection can be through some interfaces. The indirect coupling or communication connection of the device or unit can be in electrical, mechanical or other forms.

[0138] The units described as separate components may or may not be physically separated. The components displayed as units can be one physical unit or multiple physical units, that is, they can be located in one place, or they can be distributed to multiple different places. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0139] In addition, in each embodiment of this application, each functional unit can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The functions of the above integrated units can be implemented in the form of hardware or in the form of software functional units.

[0140] If the above integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on this understanding, the technical solution of the embodiments of the present application, in essence, or the part that makes a contribution, or all or part of the technical solution, can be embodied in the form of a software product. The software product is stored in a storage medium and includes several instructions for causing a device (which can be a single-chip microcomputer, a chip, etc.) or a processor to execute all or part of the steps of the above methods in the various embodiments of the present application. The foregoing storage medium includes: various media that can store program codes, such as USB flash drives, mobile hard disks, read only memory (ROM), random access memory (RAM), magnetic disks, or optical discs.

[0141] The above content is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be covered by the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An antenna tuning circuit, characterized in that: Applicable to electronic equipment; the antenna tuning circuit is connected to the antenna; the antenna tuning circuit includes a tuning switch, a power manager, a tuning controller, a Bluetooth chip and a processor; the antenna includes a Bluetooth antenna; The Bluetooth antenna is connected to the first end of the tuning switch; the power end of the tuning switch is connected to the power manager, and the control end of the tuning switch is connected to the tuning controller; the second end of the tuning switch is grounded through a first impedance matching circuit; the first end of the Bluetooth chip is connected to the Bluetooth antenna, the second end of the Bluetooth chip is connected to the power manager, and the third end of the Bluetooth chip is connected to the processor; the power manager and the tuning controller are connected to the processor respectively; The processor is used to: Acquiring shutdown information of the electronic device; the shutdown information is used to indicate that the electronic device is about to be shut down; Before the electronic device is shut down, switching the state of the tuning switch to a first state through the tuning controller, and sending a first control instruction to the power manager; The first state is used to represent that the first end and the second end of the tuning switch are connected; the first control instruction is used to instruct the power manager to supply power to the tuning switch and the Bluetooth chip after the electronic device is turned off.

2. The antenna tuning circuit according to claim 1, characterized in that: The processor is further configured to: Obtaining the power of the electronic device; When the power level of the electronic device is greater than a first power threshold, before the electronic device is shut down, the tuning controller switches the state of the tuning switch to the first state, and sends the first control instruction to the power manager.

3. The antenna tuning circuit according to claim 2, characterized in that: The processor is further configured to: When the power level of the electronic device is greater than a second power threshold and less than or equal to the first power threshold, before the electronic device is shut down, a second control instruction is sent to the power manager; the second control instruction is used to instruct the power manager to cut off power to the tuning switch and supply power to the Bluetooth chip after the electronic device is shut down.

4. The antenna tuning circuit according to claim 3, characterized in that: The processor is further configured to: When the power level of the electronic device is less than or equal to the second power threshold, before the electronic device is shut down, a third control instruction is sent to the power manager; the third control instruction is used to instruct the power manager to cut off power to the Bluetooth chip and the tuning switch after the electronic device is shut down.

5. The antenna tuning circuit according to claim 4, characterized in that: The processor is further used for: acquiring the state of the tuning switch through the tuning controller; When the state of the tuning switch is in the second state, before the electronic device is shut down, the state of the tuning switch is switched to the first state through the tuning controller, and the first control instruction is sent to the power manager; the second state is used to characterize that the first end and the second end of the tuning switch are disconnected.

6. The antenna tuning circuit according to any one of claims 1 to 5, characterized in that: The processor is further configured to: When the tuning switch is in the first state, the tuning controller controls the tuning switch to operate in a first frequency band, and controls the first impedance matching circuit to be turned on.

7. The antenna tuning circuit according to claim 6, characterized in that: The first frequency band is 2.400 GHz~2.4835 GHz.

8. An antenna tuning method, characterized in that: Applied to an electronic device, the electronic device includes an antenna; the antenna includes a Bluetooth antenna; the method includes: Acquiring shutdown information of the electronic device; the shutdown information is used to indicate that the electronic device is about to be shut down; Before the electronic device is turned off, the state of the tuning switch is switched to the first state through the tuning controller, and a first control instruction is sent to the power manager; the first state is used to indicate that the first end and the second end of the tuning switch are turned on, the first end of the tuning switch is used to be connected to the Bluetooth antenna, and the second end of the tuning switch is used to be grounded through a first impedance matching circuit; the first control instruction is used to instruct that after the electronic device is turned off, the tuning switch and the Bluetooth chip are powered by the power manager; the Bluetooth chip is used to transmit radio frequency signals with the Bluetooth antenna.

9. The antenna tuning method according to claim 8, characterized in that: The method further comprises: Obtaining the power of the electronic device; When the power level of the electronic device is greater than a first power threshold, before the electronic device is shut down, the tuning controller switches the state of the tuning switch to the first state, and sends the first control instruction to the power manager.

10. The antenna tuning method according to claim 9, characterized in that: The method further comprises: When the power level of the electronic device is greater than a second power threshold and less than or equal to the first power threshold, before the electronic device is shut down, a second control instruction is sent to the power manager; the second control instruction is used to instruct the power manager to cut off power to the tuning switch and supply power to the Bluetooth chip after the electronic device is shut down.

11. The antenna tuning method according to claim 10, characterized in that: The method further comprises: When the power level of the electronic device is less than or equal to the second power threshold, before the electronic device is shut down, a third control instruction is sent to the power manager; the third control instruction is used to instruct the power manager to cut off power to the Bluetooth chip and the tuning switch after the electronic device is shut down.

12. The antenna tuning method according to claim 11, characterized in that: The method further comprises: Acquiring the state of the tuning switch through the tuning controller; When the state of the tuning switch is in the second state, the state of the tuning switch is switched to the first state through the tuning controller according to the shutdown information of the electronic device; the second state is used to represent that the first end and the second end of the tuning switch are disconnected.

13. The antenna tuning method according to any one of claims 8 to 12, characterized in that: The method further comprises: When the tuning switch is in the first state, the tuning controller controls the tuning switch to operate in a first frequency band, and controls the first impedance matching circuit to be turned on.

14. The antenna tuning method according to claim 13, characterized in that: The first frequency band is 2.400 GHz~2.4835 GHz.

15. An electronic device, characterized in that: It comprises the antenna tuning circuit as described in any one of claims 1 to 7; the antenna tuning circuit is used to switch the antenna state of the electronic device and tune the antenna.

16. An electronic device, characterized in that: include: A memory and one or more processors, wherein the memory is coupled to the processor; wherein the memory is used to store instructions executable by the processor, and a computer program code is stored in the memory, and the computer program code includes computer instructions, and when the computer instructions are executed by the processor, the electronic device executes the antenna tuning method as described in any one of claims 8 to 14.

17. A computer-readable storage medium, characterized in that: The method comprises computer instructions, and when the computer instructions are executed on the electronic device, the electronic device executes the antenna tuning method as claimed in any one of claims 8 to 14.

18. A computer program product, characterized in that When the computer program product runs on a computer, the computer is enabled to execute the antenna tuning method according to any one of claims 8 to 14.

Images