Wireless signal shielding device supporting POE power supply configuration

Abstract

The invention discloses a wireless signal shielding device supporting POE power supply configuration, which can flexibly configure the suppression power level of a communication frequency band based on a power control unit and realize signal shielding under different frequency band power levels, so that when the power of a base station of an operator changes, a shielding device does not need to be replaced or added, and the cost is reduced. Only by slightly configuring the power level of the existing shielding device, the shielding effect can be ensured, and meanwhile, the electromagnetic radiation safety requirement of a human body is considered. When setting of the classroom shielding device needs to be adjusted during teaching, in order to not affect teaching, the signal shielding device can support parameter configuration in a power-off state through an internal integrated POE circuit. Besides, when configuration change needs to be carried out on a plurality of signal shielding devices, firmware programs of the shielding devices support UDP communication, and batch searching, configuration and upgrading can be achieved in a local area network broadcasting state.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to a wireless signal shielding device supporting POE power supply configuration. Background Art

[0002] In the current examination environment, in order to ensure the fairness of the examination, it is necessary to effectively shield all mobile phone communication frequency bands in the examination room, and the base station transmission power of the communication frequency bands of different operators is often different. At present, most of the examination room signal shielding devices on the market use blind scanning to cover the communication frequency bands disclosed by each operator, and the working frequency and power are fixed. When the power of the operator's base station changes, the shielding power of the examination room signal shielding device must also be changed accordingly. At present, there are only two solutions to deal with it: replacing the shielding device or increasing the number of shielding devices. Replacing the shielding device will consume additional costs, and the more shielding devices there are, the more radiation will be generated by the superposition of work at the same time, which is easy to cause excessive electromagnetic radiation and threaten personal health.

[0003] Therefore, in the actual application scenarios of wireless signal shielding devices in examination rooms, the following issues need to be considered: being able to flexibly configure the suppression power level of the communication frequency band; supporting the modification of the parameter configuration of the signal shielding device in the power-off state without affecting normal teaching; and being able to realize batch search, configuration and upgrade when configuration changes are required for multiple signal shielding devices. Summary of the invention

[0004] The present invention provides a wireless signal shielding device supporting POE power supply configuration, which can flexibly configure the suppression power level of the communication frequency band based on a power control unit to achieve shielding of power in different frequency bands, and supports parameter configuration in a power-off state through an integrated POE circuit. At the same time, the firmware program of the shielding device supports UDP communication, and can achieve batch search, configuration and upgrade in a local area network broadcast state.

[0005] In order to achieve the above object, an embodiment of the present invention provides a wireless signal shielding device supporting POE power supply configuration, comprising:

[0006] A plurality of communication channels and network communication units, each communication channel including a power control unit, a signal generating unit and a frequency sweep control unit;

[0007] The power control unit is used to output a corresponding suppression power level according to the working voltage to adjust the suppression power level of the wireless signal shielding device;

[0008] The signal generating unit is used to generate a corresponding interference signal according to the suppression power level and the preset frequency tuning range to perform signal shielding;

[0009] The frequency sweep control unit is used to periodically generate a sawtooth signal to provide the working voltage;

[0010] The network communication unit is used for network communication data interaction;

[0011] The network communication unit has POE related circuits integrated inside;

[0012] The POE related circuit is used to configure the parameters of the wireless signal shielding device using a single network cable and a POE switch when the power of the wireless signal shielding device is turned off.

[0013] As an improvement of the above solution, the POE related circuit includes a POE network port and a network transformer circuit and a POE power supply processing circuit;

[0014] The POE network port and network transformer circuit includes an RJ45 network socket and a network transformer;

[0015] The POE power supply processing circuit includes a rectifier bridge circuit, a signature detection circuit, a power consumption classification circuit and a DC-DC conversion circuit.

[0016] As an improvement of the above solution, the network communication unit supports UDP communication, and when a UDP firmware upgrade package of the wireless signal shielding device is monitored, the firmware of the wireless signal shielding device is upgraded.

[0017] As an improvement of the above solution, the wireless signal shielding device further includes:

[0018] A control unit, used to control the wireless signal shielding device to work;

[0019] The built-in power supply module is used to convert the input alternating current into direct current to power the wireless signal shielding device.

[0020] As an improvement of the above solution, the wireless signal shielding device further includes:

[0021] An amplifier unit, used to amplify the interference signal and transmit it to a directional antenna;

[0022] The directional antenna is used to convert the amplified interference signal into electromagnetic waves for transmission to achieve signal shielding.

[0023] As an improvement of the above solution, the wireless signal shielding device further includes:

[0024] A control unit is reserved for upgrading and extending units with unknown frequency bands.

[0025] Compared with the prior art, the implementation of the present invention has the following beneficial effects:

[0026] The embodiment of the present invention discloses a wireless signal shielding device that supports POE power supply configuration. By designing a power control unit, it can be flexibly configured according to the suppression power level of different communication frequency bands. The advantage of this design is that once the operator adjusts the output power of the base station, the user does not need to replace or add shielding equipment. It only needs to simply adjust the power configuration of the existing device to maintain the required shielding effect while taking into account the safety requirements of human electromagnetic radiation. In order to set and adjust the shielding device in the classroom without interfering with normal teaching activities, the shielding device integrates POE related circuits so that parameters can be configured through a single network cable and a POE switch in the event of a power outage, ensuring the continuity and stability of the teaching environment. In addition, the firmware program of the shielding device supports the UDP communication protocol, and can realize rapid search, batch configuration and firmware upgrade of multiple shielding devices in the LAN broadcast mode, greatly improving the configuration efficiency and operation convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of a wireless signal shielding device supporting POE power supply configuration provided by an embodiment of the present invention;

[0028] Figure 2 is a circuit structure diagram of a 4G channel provided by an embodiment of the present invention;

[0029] Figure 3 This is a circuit diagram of a POE network port and a network transformer provided by an embodiment of the present invention;

[0030] Figure 4 The present invention provides a POE power supply processing circuit diagram. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that the terms "comprises" and "specifically" and any variations of the present invention are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0033] See also Figure 1 , Figure 1 1 is a schematic diagram of a wireless signal shielding device supporting POE power supply configuration provided by an embodiment of the present invention, the signal shielding device comprising:

[0034] A plurality of communication channels and network communication units, each communication channel including a power control unit, a signal generating unit and a frequency sweep control unit;

[0035] The power control unit is used to output a corresponding suppression power level according to the working voltage to adjust the suppression power level of the wireless signal shielding device;

[0036] The signal generating unit is used to generate a corresponding interference signal according to the suppression power level and the preset frequency tuning range to perform signal shielding;

[0037] The frequency sweep control unit is used to periodically generate a sawtooth signal to provide the working voltage;

[0038] The network communication unit is used for network communication data interaction;

[0039] The network communication unit has POE related circuits integrated inside;

[0040] The POE related circuit is used to configure the parameters of the wireless signal shielding device using a single network cable and a POE switch when the power of the wireless signal shielding device is turned off.

[0041] Exemplarily, the wireless signal shielding device includes shielding devices such as a shielding device and a shielding instrument, and the communication channels include 2G, 3G, 4G, 5G, low frequency and wifi channels. The switch and suppression power level of each communication channel can be independently controlled, and remote switch management and remote power intensity adjustment functions of each sub-frequency band can be realized. It can be adjusted according to the actual scene. Based on the blocking strategy of "the enemy has it, I have it; the enemy does not have it, I have it; the enemy is strong, I am strong; the enemy is weak, I am weak", it can achieve shielding of different frequency band powers, and truly achieve higher blocking efficiency and lower radiation. Completely get rid of the blind blocking method of the traditional full-band signal shielding instrument, the blocking efficiency is dozens of times higher than that of the traditional full-band signal shielding instrument, and the wireless signal radiation is less than one-tenth of that of the traditional full-band signal shielding instrument. Within the control range, it has no effect on the normal examination of the candidates, reduces the impact of unnecessary electromagnetic radiation on the candidates and the invigilators, and avoids the shielding signal affecting the electromagnetic environment around the examination room and the lives of residents. It meets the requirements of "GB9175-1988 Environmental Electromagnetic Wave Hygiene Standard" and "GB8702-2014 Environmental Electromagnetic Wave Hygiene Standard".

[0042] Take the 4G communication channel (other channels are similar) as an example. Figure 2 As shown, Figure 2It is a circuit structure diagram of a 4G channel provided by an embodiment of the present invention. The 4G channel includes a power control unit, a signal generating unit (VCO unit) and a frequency sweep control unit. The power control unit is the core of adjusting the power level of the wireless signal shielding device. It can output the corresponding power level through different working voltages, thereby realizing signal suppression at each power level. It is mainly designed to take into account the safety requirements of human electromagnetic radiation and the shielding effect. The principle is to change the output by changing the working voltage by adjusting the duty cycle of PWM. The power control unit requires that the PWM voltage of each channel is adjustable from 0 to 5V, and all channels (including 2G, 3G, 4G, 5G, Wifi / Bluetooth, low frequency, etc.) support 32 levels of adjustment from 0 to 31. The larger the value, the greater the suppression power; taking the 4G channel as an example, two RF amplifiers SKY65174-21 are selected, and the PWM voltage output by the single-chip microcomputer is processed and input to the VREF1 pin of the RF to realize the power size. The high-frequency sine wave signal output by the VCO unit enters the power control unit to achieve different levels of power suppression, thereby achieving different shielding effects.

[0043] The VCO unit is an important part of the shielding device. It can select the corresponding VCO chip according to the preset frequency tuning range and output power, and only shield the downlink channel of the base station instead of the uplink channel. The voltage-controlled oscillator refers to an oscillator whose output frequency is a function of the input voltage signal. It needs to meet higher phase noise requirements, have faster tuning speed, good frequency-temperature characteristics and frequency drift performance, good power flatness, and good electromagnetic compatibility. Taking the 4G channel as an example, it uses 2 VCOs, and the output frequency is controlled by adjusting the resistance values ​​of VR6 and R26. The sweep control unit is a circuit that periodically generates a triangular wave signal, also known as a scanning circuit or a time base generator. The wireless signal shielding device is equipped with a sweep control unit (NE555 time base circuit) on each channel (a total of 17 channels) to prevent the failure of a certain channel sweep control unit from causing all channels to fail. Taking the 4G channel unit as an example, it outputs a 138KHZ triangular wave low-frequency signal, which is converted into a high-frequency sine wave signal by the VCO unit.

[0044] Exemplarily, the network communication unit is the medium for the jammer to communicate with the test site management and control software. Network communication interaction data must be interacted through this unit. This part has built-in POE (Power over Ethernet) related circuits, which supports the wireless signal jamming device to use a single network cable with a POE switch to perform parameter configuration (such as channel switch settings, power adjustment, etc.) when the power is off, without affecting normal teaching. The working process of the POE-related circuit is: detection - PD (Power Device) end device classification - start power supply - power supply - power off; for example, at the beginning, the PSE (Power Sourcing Equipment) device (POE switch) outputs a small voltage at the port until it detects that the cable terminal is connected to a power receiving device that supports the IEEE802.3af standard; when the PD of the receiving device is detected, the PSE device can classify the PD device and evaluate the power loss required by the PD device; within a configurable time during startup (usually less than 15μs), the PSE device starts to supply power to the PD device from a low voltage until a 48V DC power supply is provided; a stable and reliable 48V DC power supply is provided for the partial discharge device to meet the power consumption of the partial discharge device not exceeding 15.4W; if the PD device is disconnected from the network, the PSE will quickly (usually within 300-400ms) stop supplying power to the PD device, repeat the detection process, and detect whether the cable terminal is connected to the PD device.

[0045] In a specific embodiment, when the wireless signal shielding device is applied to a teaching scenario, such as installing the wireless signal shielding device in a classroom, it is inconvenient to turn on the wireless signal shielding device during class. If the wireless signal shielding device information needs to be reconfigured at this time (such as channel switch settings, power adjustment, etc.), the traditional examination room network shielding device defaults to the shielding function turned on when it leaves the factory. When the device information needs to be reconfigured, the shielding device power must be turned on, which will affect the teaching and cause unnecessary trouble; and the traditional examination room network shielding device leaves the factory with a fixed IP, and is connected and configured by directly connecting the computer and the device. When the device has been configured but the local IP is forgotten, it can only be reconfigured by restoring the factory. However, a wireless signal shielding device that supports POE power supply configuration provided in an embodiment of the present invention supports modifying the device configuration information and the shielding device suppression power using a single network cable in conjunction with a POE switch when the device power is turned off, without affecting normal teaching.

[0046] Furthermore, the POE related circuit includes a POE network port and a network transformer circuit and a POE power supply processing circuit;

[0047] The POE network port and network transformer circuit includes an RJ45 network socket and a network transformer;

[0048] The POE power supply processing circuit includes a rectifier bridge circuit, a signature detection circuit, a power consumption classification circuit and a DC-DC conversion circuit.

[0049] like Figure 3 As shown, Figure 3 This is a circuit diagram of a POE network port and a network transformer provided by an embodiment of the present invention. Figure 3 RJ1 (R-RJ45R08P-C000) is the RJ45 network socket, pins 1, 2, 3, and 6 are data lines for network communication (pin 1 is the positive pole for sending data, pin 2 is the negative pole for sending data, pin 3 is the positive pole for receiving data, and pin 4 is the negative pole for receiving data), 4 and 5 are the positive poles of POE power, 7 and 8 are the negative poles of POE power; 9 and 10 are Link / ACT indicators, and 11 and 12 are Speed ​​indicators: used to indicate the network transmission speed. Depending on the network rate, the light will display different flashing frequencies. The network data communication data line of RJ1 (i.e., pins 1, 2, 3, and 6) will be connected to the corresponding pins of the network transformer L3 (HY601680) (i.e., pin 1 of RJ1 corresponds to pin 16 of HY601680, pin 2 of RJ1 corresponds to pin 14 of HY601680, pin 3 of RJ1 corresponds to pin 11 of HY601680, and pin 6 of RJ1 corresponds to pin 9 of HY601680). Pins 15 and 10 of L3 are the center tap voltages, which can be provided by the DC bias voltage provided by the receiving PD end; pins 1, 3, 6, and 8 of L3 are connected to the network chip of the network control unit to ensure normal network communication.

[0050] like Figure 4 As shown, Figure 4This is a POE power supply processing circuit diagram provided by an embodiment of the present invention, which includes four parts. The first part is a rectifier bridge circuit. The purpose of this circuit is to ensure that no matter the polarity of POE+ and POE- or TX_CM and RX_CM, the subsequent voltage can be output normally to prevent burning other circuits; the second part is a signature detection circuit. According to the IEEE802.3af standard, the PD detection state should meet the input impedance between 23.75 and 26.25KΩ and the input capacitance between 0.02 and 0.12uF. Therefore, the input impedance of the signature detection circuit of our company's equipment is 24.9KΩ and the input capacitance is 0.1uF; the third part is a power consumption classification circuit. This circuit mainly realizes a level 0 PD. The implementation process is that PSE sends a 14.5v-20v voltage to the device, and the voltage regulator D1 cannot be turned on, so PSE will detect a current of 0mA. When the classification current is 0-4ma, the classification level is 0; the fourth part is the DC-DC conversion circuit. The circuit uses the H6225KDC-DC chip. H6225K is a built-in 60V withstand voltage MOS, which supports input up to 48V high-voltage step-down switch controller, and can provide 2.5A continuous current to the load to support output constant voltage. This circuit obtains an output voltage of 12V by setting R23 and R24, and sets the maximum output current to 1A by setting R26. The power supply can be stepped down and output to the MCU main control chip through the LDO chip for operation.

[0051] Since the shielding function of the examination room shielding device is turned on by default, when the device information is reconfigured, the power of the examination room shielding device needs to be turned on, and the shielding function is turned on synchronously, which will affect the teaching and cause unnecessary trouble; however, in the embodiment of the present invention, the PSE device is connected to the network port of the shielding device (PD) through a network cable, and the network port only supplies power to the subsequent control unit and the network communication unit through the network transformer circuit, the rectifier bridge circuit, the signature detection circuit, the power level circuit and the DC-DC conversion circuit (at this time, the VCO unit and the amplification unit are not powered), and is executed according to the standard process, supports the 802.3at / af protocol, and can be realized when the shielding device is powered off. The configuration information of the device and the shielding device suppression power can be modified through the POE switch without affecting normal teaching.

[0052] Specifically, the network communication unit supports UDP communication, and when a UDP firmware upgrade package of the wireless signal shielding device is monitored, the firmware of the wireless signal shielding device is upgraded.

[0053] For example, the examination room shield is shipped with a fixed IP. When the device has been configured but the local IP is forgotten, it can only be reconfigured by restoring the factory. It does not support remote firmware upgrades, which makes later operation and maintenance inconvenient. However, the firmware program of the shield provided by the embodiment of the present invention supports UDP (User Datagram Protocol) communication and monitors broadcast packets in the network. When the data packet of the corresponding device is detected, it will reply. When the UDP firmware upgrade packet of the device is monitored, it will jump to the bootloader to connect to TCP (Transmission Control Protocol) to achieve firmware upgrade. This function is a program design part, so it supports LAN broadcast search, performs relevant settings in the broadcast state, and combines with the host computer to perform firmware upgrades in the broadcast state.

[0054] Furthermore, the wireless signal shielding device further includes:

[0055] A control unit, used to control the wireless signal shielding device to work;

[0056] The built-in power supply module is used to convert the input alternating current into direct current to power the wireless signal shielding device.

[0057] For example, the control unit is the MCU unit, which loads the jammer program, integrates rich peripherals, and can control the network communication unit, power control unit, etc. The built-in power module converts the 220V AC input into a DC 12V output to supply power to other units.

[0058] Furthermore, the wireless signal shielding device further includes:

[0059] An amplifier unit, used to amplify the interference signal and transmit it to a directional antenna;

[0060] The directional antenna is used to convert the amplified interference signal into electromagnetic waves for transmission to achieve signal shielding.

[0061] Furthermore, the wireless signal shielding device further includes:

[0062] A control unit is reserved for upgrading and expanding units with unknown frequency bands.

[0063] For example, the amplifier unit is used to amplify the interference signal and output it through the antenna; the reserved control unit is a unit used for future upgrades and expansions of unknown frequency bands; and the directional antenna is used to convert electrical signals into electromagnetic waves for transmission, thereby achieving examination room shielding.

[0064] It is worth noting that the working process of the signal shielding device is as follows: the scanning signal generated by the frequency sweeping unit is inverted by the inverter and then modulated by the VCO unit. In the corresponding downlink frequency band, the modulated frequency sweeping signal is amplified by the power control unit, and the PWM voltage generated by the control unit outputs the suppression power of the corresponding frequency band. The amplified frequency sweeping signal is transmitted to the air in the form of radio waves. Because the frequency sweeping signal will form garbled interference in the message signal received by the mobile phone, the mobile phone cannot detect the normal microwave signal data sent from the base station, so that the mobile phone cannot connect to the base station within a certain range. At this time, the mobile phone will search for the network, no signal, no service system, etc., so as to achieve the purpose of disabling the mobile phone. When the mobile phone leaves the range of the shielding device, it can be fully restored to normal use.

[0065] In summary, the embodiment of the present invention discloses a wireless signal shielding device supporting POE power supply configuration, including a built-in power module, a control unit, a reserved control unit, an amplifier unit, a power control unit, a sweep control unit, a signal generating unit, a network communication unit, and a directional antenna. Among them, the power control unit can be flexibly configured according to the suppression power level of different communication frequency bands. The advantage of this design is that once the operator adjusts the output power of the base station, the user does not need to replace or add shielding equipment, but only needs to simply adjust the power configuration of the existing device to maintain the required shielding effect while taking into account the safety requirements of human electromagnetic radiation. The network communication unit is internally provided with POE-related circuits, which can configure the parameters of the signal shielding device through a single network cable and a POE switch when the power of the shielding device is turned off. The advantage of this design is that the shielding device in the classroom can be set and adjusted without interfering with normal teaching activities, ensuring the continuity and stability of the teaching environment. The firmware program of the shielding device supports the UDP communication protocol. The advantage of this design is that it can realize the rapid search, batch configuration and firmware upgrade of multiple shielding devices in the LAN broadcast mode, which greatly improves the configuration efficiency and operation convenience.

[0066] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A wireless signal shielding device supporting POE power supply configuration, characterized in that: include: A plurality of communication channels and network communication units, each communication channel including a power control unit, a signal generating unit and a frequency sweep control unit; The power control unit is used to output a corresponding suppression power level according to the working voltage to adjust the suppression power level of the wireless signal shielding device; The signal generating unit is used to generate a corresponding interference signal according to the suppression power level and the preset frequency tuning range to perform signal shielding; The frequency sweep control unit is used to periodically generate a sawtooth signal to provide the working voltage; The network communication unit is used for network communication data interaction; The network communication unit has POE related circuits integrated inside; The POE related circuit is used to configure the parameters of the wireless signal shielding device using a single network cable and a POE switch when the power of the wireless signal shielding device is turned off.

2. The wireless signal shielding device supporting POE power supply configuration as claimed in claim 1, characterized in that: The POE related circuits include a POE network port and a network transformer circuit and a POE power processing circuit; The POE network port and network transformer circuit includes an RJ45 network socket and a network transformer; The POE power supply processing circuit includes a rectifier bridge circuit, a signature detection circuit, a power consumption classification circuit and a DC-DC conversion circuit.

3. The wireless signal shielding device supporting POE power supply configuration as claimed in claim 1, characterized in that: The network communication unit supports UDP communication, and when a UDP firmware upgrade package of the wireless signal shielding device is monitored, the firmware of the wireless signal shielding device is upgraded.

4. The wireless signal shielding device supporting POE power supply configuration as claimed in claim 2, characterized in that: The wireless signal shielding device further includes: A control unit, used to control the wireless signal shielding device to work; The built-in power supply module is used to convert the input alternating current into direct current to power the wireless signal shielding device.

5. The wireless signal shielding device supporting POE power supply configuration as claimed in claim 4, characterized in that: The wireless signal shielding device further includes: An amplifier unit, used to amplify the interference signal and transmit it to a directional antenna; The directional antenna is used to convert the amplified interference signal into electromagnetic waves for transmission to achieve signal shielding.

6. The wireless signal shielding device supporting POE power supply configuration as claimed in claim 5, characterized in that: The wireless signal shielding device further includes: A control unit is reserved for upgrading and expanding units with unknown frequency bands.

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