A signal shielding and recording interference device supporting wireless charging of mobile phones

Abstract

This invention discloses a signal shielding and recording interference device supporting wireless charging for mobile phones. The device includes: a power conversion chip and a lithium battery, both connected to a wireless charging module, a host controller, and a frequency controller, providing power to these components; a charging management chip connected to both the host controller and the lithium battery; the host controller connected to a pressure detection module; the host controller connected to the wireless charging module for turning wireless charging on and off; the host controller connected to a status indicator light; the host controller connected to the frequency controller; the frequency controller connected to a power amplification module; and the power amplification module connected to an ultrasonic sensor. Compared to similar products currently on the market, this invention offers superior shielding and recording interference performance, is more user-friendly, and provides greater practicality for users.

Description

Technical Field

[0001] This invention relates to the field of communication security technology, and in particular to a signal shielding and recording interference device that supports wireless charging of mobile phones. Background Technology

[0002] With the development of communication technologies and equipment, signal location and voice leakage caused by mobile phones and recording devices are increasingly becoming problems that need to be addressed in important and confidential locations. Currently, various mobile phone signal jamming and anti-recording devices exist on the market, but problems remain, such as unreasonable device structure design, unuser-friendly functional design, and circuit design that fails to overcome traditional power limitations. These issues result in poor signal jamming and anti-recording effects, as well as limited usability, severely restricting the practical application of these devices. Summary of the Invention

[0003] This invention provides a signal shielding and recording interference device that supports wireless charging of mobile phones. While shielding mobile phone signals, this invention can also interfere with the recording of mobile phones and other recording devices; it can also wirelessly charge mobile phones. Through a sophisticated structural and electronic circuit design, this invention has higher shielding and recording interference performance than similar products currently on the market. The device is more user-friendly and offers greater practicality to users. See the description below for details:

[0004] A signal shielding and recording interference device supporting wireless charging of mobile phones, the device comprising:

[0005] The power conversion chip and lithium battery are both connected to the wireless charging module, host controller and frequency controller, and provide power to the wireless charging module, host controller and frequency controller;

[0006] The charging management chip is connected to the host controller and the lithium battery respectively. The host controller is connected to the pressure detection module. The host controller is also connected to the wireless charging module and is used to turn wireless charging on and off.

[0007] The main controller is connected to the status indicator light, the main controller is connected to the frequency controller, the frequency controller is connected to the power amplifier module, and the power amplifier module is connected to the ultrasonic sensor.

[0008] The device is a box structure, and the outer and inner isolation and pressing layers of the box are all made of metal.

[0009] Furthermore, the number of ultrasonic sensors is four, located at the four corners of the device, and the ultrasonic sensors are installed using a columnar groove design.

[0010] The frequency controller and power amplifier module each contain four sub-modules for independently driving four ultrasonic sensors.

[0011] Furthermore, the host controller randomly sends frequency parameters within a preset frequency range to four frequency controllers, which respectively control the power amplifier modules to output ultra-high power signals of different frequencies to drive the ultrasonic sensors, thereby forming a mixed and superimposed interference signal.

[0012] Preferably, the four power amplifier modules use MOSFETs.

[0013] Preferably, the upper and lower parts of the device are provided with grooves and protrusions at the joint position, and compressible shielding foam is pasted at the groove position.

[0014] Preferably, the power amplifier module includes: resistors R1, R2, R3, R4, R5, and R6; transistors Q1 and Q2; MOSFET Q3; and inductor L1.

[0015] Resistors R1 and R4 are used to limit the current at the base terminals of transistors Q1 and Q2; resistors R2, R3, and R5 are used for voltage division; resistor R6 is a pull-up resistor; transistors Q1 and Q2 provide drive current for MOSFET Q3, the switching frequency of MOSFET Q3 is controlled by the In signal, L1 is a high-power inductor, and VCC_ADJ is an adjustable voltage.

[0016] The wireless charging module includes a wireless charging controller and a coil.

[0017] The beneficial effects of the technical solution provided by this invention are:

[0018] 1. This product greatly improves its signal shielding performance through a grooved double-press design and a sealed design with built-in elastic metal foam.

[0019] 2. Through research, this product utilizes a scheme that uses MOSFETs to control the charging and discharging of inductors to achieve ultra-high power drive. The circuit design is simple, the solution cost is low, and while improving recording interference performance, the product cost is optimized.

[0020] 3. This product uses four randomly selected high-frequency signals to drive the four ultrasonic sensors, thereby achieving internal mixing interference, expanding the interference frequency range, and greatly improving the recording interference performance.

[0021] 4. This product has a built-in wireless charging module for mobile phones, and the host controller controls and manages the wireless charging, improving the product's flexibility and applicability. Attached Figure Description

[0022] Figure 1 This is the electrical connection diagram of the internal control system of the device;

[0023] Figure 2 This is a control diagram for ultrasonic interference;

[0024] Figure 3 This is the circuit design diagram for the power amplifier module;

[0025] Figure 4 Control diagram for wireless charging of mobile phones;

[0026] Figure 5 This is a design drawing of the overall structure of the device;

[0027] Figure 5 middle:

[0028] JG1: Box lid groove; JG2: Box lid protrusion;

[0029] JG3: First ultrasonic sensor columnar groove; JG4: Second ultrasonic sensor columnar groove;

[0030] JG5: Wireless charging coil sensing area for mobile phones; JG6: Pressure detection button;

[0031] JG7: Third ultrasonic sensor columnar groove; JG8: Fourth ultrasonic sensor columnar groove.

[0032] Figure 6 A schematic diagram of the groove design for an ultrasonic sensor;

[0033] Figure 7 This is a diagram showing the placement of the ultrasonic sensor.

[0034] Figure 8 This is a rear view of the device.

[0035] Figure 8 middle:

[0036] JG9: External power switch button; JG10: External power socket. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below.

[0038] This invention provides a signal shielding and recording interference device that supports wireless charging of mobile phones. See [link to related document]. Figure 1 The internal control system of the device includes: host controller A, frequency controller C, power amplifier module E, ultrasonic sensor D, status indicator F, wireless charging module B, power conversion chip G, power control module J, pressure detection module K, charging management chip H and lithium battery I.

[0039] The power conversion chip G and lithium battery I are both connected to the wireless charging module B, the host controller A, and the frequency controller C, and provide power to these components. The host controller A is connected to the charging management chip H, which in turn is connected to the lithium battery I. When an external power source is available, the host controller A charges the lithium battery I by controlling the charging management chip H. The host controller A is connected to the pressure detection module K, receiving detection signals from the pressure detection module K in real time. The host controller A is connected to the wireless charging module B, used to turn the wireless charging function on and off. The host controller A is connected to the status indicator F, used to control the status indicator F to display the current status of the device. The host controller A is connected to the frequency controller C, which is connected to the power amplification module E, which is connected to the ultrasonic sensor D, enabling frequency and power control of the ultrasonic signals emitted by the ultrasonic sensor D. All modules and chips are integrated on a single circuit board. The device preferably adopts a box structure, with the circuit board placed inside the box. The outer and inner isolation layers and pressure layers of the box are all made of metal.

[0040] When the device is powered on or the lithium battery is charged, the power control module J is first activated via a button on the device's exterior. The external power supply or the internal lithium battery I then powers the internal circuit board via the power conversion chip G. The internal circuit board enters standby mode. The host controller A on the circuit board reads the signal from the pressure detection module K in real time. When the cover and body of the device are pressed together, the pressure detection module K immediately outputs a high level to the host controller A. The host controller A randomly sends frequency parameters within a preset frequency range to the frequency controller C. The frequency controller C outputs a high-frequency pulse signal matching the received parameters to the power amplifier module E. After being amplified by the power amplifier module E, a high-power ultra-high-frequency drive signal is output to the ultrasonic sensor D, forming a recording interference signal in the form of ultrasonic waves, thus activating the recording interference function. Simultaneously, when the host controller A reads the high-level signal from the pressure detection module K, it immediately pulls the EN pin of the wireless charging module B low, putting the wireless charging module B into normal working condition.

[0041] The recording interference function of the device is jointly achieved by the host controller A, frequency controller C, power amplifier module E, ultrasonic sensor D, and the placement and installation design of ultrasonic sensor D. Through the coordinated work of host controller A, frequency controller C, power amplifier module E, and ultrasonic sensor D, the device itself emits ultra-high frequency and high power ultrasonic signals that exceed the range of human hearing, thereby effectively interfering with the recording equipment. Four ultrasonic sensors D are installed inside the device, located at the four corners, so that the entire space inside the device is completely surrounded by ultrasonic signals. At the same time, the installation of ultrasonic sensor D adopts a columnar groove design, which makes the housing of ultrasonic sensor D fit completely with the device structure, ensuring airtightness and preventing ultrasonic signal leakage, thereby greatly improving the recording interference effect.

[0042] Specifically, the four ultrasonic sensors D inside the device are controlled by four independent control circuits for frequency control and power amplification. See the ultrasonic interference control diagram. Figure 2 As shown ( Figure 2 The ultrasonic sensors D1, D2, D3, and D4 are listed in the diagram. The host controller A is a GD32F407VET6 model, connected to the frequency controller C (GD32E230C8T6 model) via four I / O ports. Figure 2 The code specifies frequency controllers C1, C2, C3, and C4. The host controller A randomly sends square wave frequency parameters within a preset frequency range to the four frequency controllers C at a frequency of 1 second / cycle. The frequency parameters sent by the host controller A include the center frequency value and the frequency offset range value, causing the four frequency controllers C to output square wave signals with different and continuously changing center frequency values ​​and frequency offset ranges. These square wave signals with different and continuously changing frequencies are then amplified by the power amplifier module E. Figure 2 The diagram illustrates how power amplification modules E1, E2, E3, and E4 amplify the signal, driving ultrasonic sensor D with a square wave of extremely high amplitude and frequency. The four ultrasonic sensors then emit ultrasonic interference signals of varying ultra-high frequency, amplitude, and frequency, ultimately creating a mixed and superimposed interference signal within the device. This significantly enhances the recording interference effect by expanding the frequency range of the interference signal. The frequency parameters sent by the host controller include the center frequency value and the frequency offset range value.

[0043] Specifically, the circuit design of power amplifier module E is as follows: Figure 3As shown, the input signal In comes from the frequency controller C, and the output signals Output1 and Output2 are connected to the two ends of the ultrasonic sensor D, respectively. The entire circuit design uses separate discrete components to amplify the voltage and current values ​​under extremely low cost conditions. The design scheme and implementation principle break through the limitations of traditional simple power amplifier chips, so that the power provided by the circuit output terminals Output1 and Output2 far exceeds the output power of a simple power amplifier chip.

[0044] The power amplifier module E circuit design is as follows: Figure 3 The functions of each discrete component are as follows: R1 and R4 limit the current to the base terminals of Q1 and Q2; R2, R3, and R5 divide the voltage to prevent excessive voltage across Q1, Q2, and Q3; R6 is a pull-up resistor; transistors Q1 and Q2 amplify the current to provide drive current for the high-power MOSFET Q3, which mainly functions as a switch. The switching frequency of Q3 is controlled by the In signal; L1 is a high-power inductor that can output a large voltage during discharge; VCC_ADJ is an adjustable voltage, the specific value of which is determined based on the actual circuit debugging.

[0045] This device supports wireless charging for mobile phones, integrating the wireless charging module B inside the device. The wireless charging control diagram is shown below. Figure 4 As shown, host controller A is connected to mobile phone wireless charging module B via I / O port. Mobile phone wireless charging module B includes: wireless charging controller LTC4152 and coil LTX. Host controller A is connected to the EN pin of wireless charging controller via I / O port to control the on and off of mobile phone wireless charging function. When the mobile phone is placed inside the device, the external power switch button of the device is turned on, and host controller A receives a high-level signal from the pressure detection module K. Host controller A pulls the EN pin of wireless charging controller LTC4152 low. The coil LTX connected to wireless charging controller LTC4152 transmits polling pulses at a predetermined frequency. When a pulse reply is received, the mobile phone is identified, power negotiation is completed, and the mobile phone is charged according to the negotiated power.

[0046] This device supports wireless charging for mobile phones, recording interference, and signal shielding. To optimize all functions, and especially to address the poor performance of current signal shielding and recording interference products on the market, this invention employs a special structural design. The overall structural design of the device is as follows: Figure 5As shown: The device is in the form of a rectangular box. JG1 and JG2 are the groove and protrusion of the upper part of the box cover, respectively. This part is tightly pressed with the protrusion and groove of the lower part of the box body. Elastic metal foam is pasted in the groove of the box cover and the box body to ensure that the upper and lower parts fit tightly and prevent the signal from leaking out. This enhances the signal shielding effect and improves the performance of recording interference.

[0047] Specifically, the ultrasonic sensor D installed inside the device... Figure 5 As shown in JG3, JG4, JG7, and JG8, the ultrasonic sensor itself is cylindrical and embedded in a cylindrical groove within the device housing. It is electrically connected to the main circuit board through two pinholes at the bottom of the groove. The grooves of the ultrasonic sensor D are all made of metal, which not only shields the electromagnetic signals within the device but also avoids the problem of poor recording performance caused by ultrasonic interference signals scattering into the housing. The cylindrical groove design of the ultrasonic sensor DD is as follows... Figure 6 As shown in the diagram, the placement of the ultrasonic sensor is as follows: Figure 7 As shown.

[0048] Specifically, the pressure detection module K of the device consists of a pressure detection button combined with voltage divider and debounce components. When the pressure detection button is not pressed, the pressure detection module K outputs a low level to the host controller A. When the pressure detection button is pressed, the pressure detection module K outputs a high level to the host controller A. The host controller A controls each functional module according to the received instructions, such as... Figure 5 As shown, JG6 is the pressure detection button.

[0049] Specifically, in the overall design of the device, an external power switch button is used, such as Figure 8 As shown in JG9, the power supply of the internal system motherboard can be easily controlled, enabling independent control of the recording interference function and the signal shielding function, without affecting or restricting each other. In particular, the recording interference function requires power consumption, and the external power switch button can help users to turn on the recording interference function when needed and turn it off when not needed. This facilitates the management of the built-in lithium battery power and maximizes the device's normal continuous working time without an external power supply.

[0050] Specifically, the device's status indicator lights are controlled by the host controller to indicate the device's current status in real time. The power supply status, lithium battery power status, wireless charging status, and recording interference status of the device are monitored in real time and displayed to the user through the indicator lights, making it convenient for the user to use and monitor the device.

[0051] In particular, the built-in lithium battery powers the entire built-in circuit system through the power conversion chip G when there is no external power source. This ensures that the device can continuously record and interfere with the recording and wirelessly charge the mobile phone without an external power source. The normal working time can last for 6 hours, which greatly facilitates the portability and mobility of the device and greatly improves its environmental adaptability.

[0052] Preferably, the ultrasonic sensors distributed at both ends of the device have a spacing of 47mm between ultrasonic sensors at the same end and a spacing of 132mm between ultrasonic sensors at both ends. The plane area surrounded by the four ultrasonic sensors covers more than 98% of the mobile phone sizes on the market, ensuring that when the mobile phone is placed inside the device, there will be no reduction in recording effect caused by the ultrasonic sensors being covered.

[0053] Preferably, the four power amplification modules employ a scheme where MOSFETs control the charging and discharging of inductors. This utilizes the high voltage generated by inductor discharge to achieve power amplification, overcoming the power limitations of traditional audio amplification modules, enabling ultra-high power drive, and enhancing interference resistance. Unless otherwise specified, the model numbers of the components in this embodiment are not limited; any component capable of performing the above functions is acceptable.

[0054] Those skilled in the art will understand that the accompanying drawings are merely schematic diagrams of a preferred embodiment, and the sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A signal shielding and recording interference device supporting wireless charging of mobile phones, characterized in that, The device includes: The power conversion chip and lithium battery are both connected to the wireless charging module, host controller and frequency controller, and provide power to the wireless charging module, host controller and frequency controller; The host controller is connected to the charging management chip, which in turn is connected to the lithium battery. When there is an external power source, the host controller charges the lithium battery by controlling the charging management chip. The host controller is also connected to the pressing detection module and receives detection signals from the pressing detection module in real time. The host controller is connected to the wireless charging module to turn the wireless charging function on and off; the host controller is connected to the status indicator light to control the current status of the status indicator light display device; the host controller is connected to the frequency controller, the frequency controller is connected to the power amplifier module, and the power amplifier module is connected to the ultrasonic sensor to realize the frequency and power control of the ultrasonic signal emitted by the ultrasonic sensor. When the device is powered on or the lithium battery is charged, the power control module is activated by a button on the device's exterior. The external power supply or the internal lithium battery then powers the internal circuit board via a power conversion chip. The internal circuit board enters standby mode. The host controller on the circuit board reads the signal from the pressing detection module in real time. When the cover and body of the device are pressed together, the pressing detection module immediately outputs a high level to the host controller. The host controller randomly sends frequency parameters within a preset frequency range to the frequency controller. The frequency controller outputs a high-frequency pulse signal matching the received parameters to the power amplifier module. After amplification by the power amplifier module, a high-power ultra-high-frequency drive signal is output to the ultrasonic sensor, which generates a recording interference signal in the form of ultrasonic waves, thus activating the recording interference function. The recording interference function of the device is jointly realized by the host controller, frequency controller, power amplifier module, ultrasonic sensor, ultrasonic sensor placement design and ultrasonic sensor installation method design. Through the coordinated work of the host controller, frequency controller, power amplifier module and ultrasonic sensor, the device itself emits ultra-high frequency and high power ultrasonic signals that are beyond the range of human hearing, thus interfering with the recording equipment. The device is designed to house four ultrasonic sensors, located at the four corners of the device, with the entire interior space completely surrounded by ultrasonic signals; the ultrasonic sensors are mounted using a columnar recess design. The device is in the form of a rectangular box. JG1 and JG2 are the groove and protrusion of the upper part of the box cover, respectively. This part is tightly pressed with the protrusion and groove of the lower part of the box body. Elastic metal foam is pasted in the groove of the box cover and the box body. The ultrasonic sensor is cylindrical and embedded in a cylindrical groove in the box. It is electrically connected to the main circuit board through two pinholes at the bottom of the cylindrical groove. The grooves of the ultrasonic sensor are all made of metal to shield the electromagnetic signals in the device. The upper and lower parts of the device are both provided with grooves and protrusions at the joint position, and compressible shielding foam is pasted in the groove position; the frequency parameters sent by the host controller include the center frequency value and the frequency offset range value. The device has ultrasonic sensors distributed at both the top and bottom. The distance between ultrasonic sensors at the same end is 47mm, and the distance between ultrasonic sensors at the top and bottom ends is 132mm.

2. The signal shielding and recording interference device supporting wireless charging of mobile phones according to claim 1, characterized in that, The outer and internal isolation and pressing layers of the box are all made of metal.

3. The signal shielding and recording interference device supporting wireless charging of mobile phones according to claim 1, characterized in that, The power amplifier module includes: resistors R1, R2, R3, R4, R5, and R6; transistors Q1 and Q2; MOSFET Q3; and inductor L1. Resistors R1 and R4 are used to limit the current values ​​at the base terminals of transistors Q1 and Q2; resistors R2, R3, and R5 are used for voltage division; resistor R6 is a pull-up resistor; transistors Q1 and Q2 provide drive current for MOSFET Q3, the switching frequency of MOSFET Q3 is controlled by the In signal, L1 is a high-power inductor, and VCC_ADJ is an adjustable voltage.

4. The signal shielding and recording interference device supporting wireless charging of mobile phones according to claim 1, characterized in that, The wireless charging module includes a wireless charging controller and a coil.

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