CN117715400A - Electromagnetic protection control device - Google Patents
Electromagnetic protection control device Download PDFInfo
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- CN117715400A CN117715400A CN202311721376.7A CN202311721376A CN117715400A CN 117715400 A CN117715400 A CN 117715400A CN 202311721376 A CN202311721376 A CN 202311721376A CN 117715400 A CN117715400 A CN 117715400A
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- 230000005670 electromagnetic radiation Effects 0.000 claims abstract description 120
- 230000006698 induction Effects 0.000 claims abstract description 31
- 230000008030 elimination Effects 0.000 claims abstract description 11
- 238000003379 elimination reaction Methods 0.000 claims abstract description 11
- 230000003068 static effect Effects 0.000 claims description 64
- 230000005611 electricity Effects 0.000 claims description 28
- 238000001514 detection method Methods 0.000 claims description 10
- 239000007769 metal material Substances 0.000 claims description 3
- 230000000737 periodic effect Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 16
- 238000007599 discharging Methods 0.000 description 11
- 238000005070 sampling Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000002238 attenuated effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000001739 density measurement Methods 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0007—Casings
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0067—Devices for protecting against damage from electrostatic discharge
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Abstract
The application relates to the field of electromagnetic protection and provides an electromagnetic protection control device, which comprises a control circuit board, a power supply unit and an electromagnetic shielding circuit, wherein the control circuit board comprises an electromagnetic radiation induction piece, a control piece and an electrostatic elimination circuit, the control piece is provided with a power supply input end, a power supply output end, an induction input end and a control output end, the power supply input end is electrically connected with the power supply unit, the power supply output end is electrically connected with the electromagnetic shielding circuit, the induction input end is electrically connected with the electromagnetic radiation induction piece, and the control output end is electrically connected with the electrostatic elimination circuit; the electromagnetic radiation induction piece detects electromagnetic radiation signals and transmits current electromagnetic radiation information, the control piece controls the on-off of the electromagnetic shielding circuit and adjusts the power input into the electromagnetic shielding circuit according to the electromagnetic radiation information, and the current electromagnetic radiation information comprises the electromagnetic radiation direction and the electromagnetic radiation intensity. The electromagnetic compatibility of the sensor is ensured by the electromagnetic shielding circuit of the shell and the hollow cavity of the shell to precisely shield the external electromagnetic interference.
Description
Technical Field
The present application relates to the field of electromagnetic protection, and in particular, to an electromagnetic protection control device.
Background
Electromagnetic compatibility (EMC, electromagnetic Compatibility) refers to the ability of a device or system to operate satisfactorily in its electromagnetic environment and not create intolerable electromagnetic disturbances to any device in its environment. The sensor is widely applied to various detection fields, however, the sensor is often required to be in a region with complex electromagnetic environment when in application, and thus, certain requirements are provided for the electromagnetic compatibility of the sensor.
In order to ensure electromagnetic compatibility of the sensor, a protection circuit with only a diode is often adopted to resist EFT and surge in the current market, and the mode has poor performance. There is another way to directly arrange the shielding case and shield the external electromagnetic radiation through the weakness, however, this way cannot adapt to various electromagnetic environments, and the sensor needs to cope with various complex and changeable electromagnetic environments, and the fixed electromagnetic compatibility is not beneficial to the adaptive use of the sensor.
Disclosure of Invention
In order to adapt to the application scene of multiple different electromagnetic radiation intensity, this application provides an electromagnetic protection controlling means.
The application provides an electromagnetic protection controlling means adopts following technical scheme:
an electromagnetic protection control device is used for a sensor and comprises a control circuit board, a power supply unit and an electromagnetic shielding circuit, wherein the control circuit board is positioned in a cavity of the sensor, the power supply unit is positioned in the cavity of the sensor, the electromagnetic shielding circuit is positioned in a cavity in a shell of the sensor, the power supply unit is electrically connected with the control circuit board, and the control circuit board is used for being electrically connected with the electromagnetic shielding circuit;
the control circuit board comprises an electromagnetic radiation induction piece, a control piece and a static electricity eliminating circuit, and the electromagnetic radiation induction piece, the control piece and the static electricity eliminating circuit are all electrically connected with the power supply unit; the control piece is provided with a power supply input end, a power supply output end, an induction input end and a control output end, wherein the power supply input end is electrically connected with the power supply unit, the power supply output end is electrically connected with the electromagnetic shielding circuit, the induction input end is electrically connected with the electromagnetic radiation induction piece, and the control output end is electrically connected with the static electricity eliminating circuit; the electromagnetic radiation induction piece detects electromagnetic radiation signals and transmits current electromagnetic radiation information, the control piece controls the on-off of the electromagnetic shielding circuit and adjusts the power input into the electromagnetic shielding circuit according to the electromagnetic radiation information, and the current electromagnetic radiation information comprises an electromagnetic radiation direction and electromagnetic radiation intensity;
the static elimination circuit is electrically connected with the static elimination unit and comprises a static detection unit and a discharge unit, all grounding ends of the control circuit board are respectively electrically connected with an input end of the discharge unit and an input end of the static detection unit, an output end of the static detection unit is grounded, an output end of the discharge unit is grounded, the static detection unit detects current to be detected and transmits the current to a control member, and the control member outputs a discharge signal to the discharge unit when the current to be detected exceeds a preset value so as to enable the discharge unit to start.
Through adopting above-mentioned technical scheme, the sensor not only isolates external electromagnetic interference through the shell, can also further shield external electromagnetic interference through the electromagnetic shield circuit of shell cavity in, adopts the static elimination circuit to realize the influence of inside formation static in the sensor work application process simultaneously.
In the scheme, the electromagnetic radiation intensity and the electromagnetic radiation direction which pass through the shell and reach the inside of the sensor are detected through the electromagnetic radiation induction piece, and then the on-off of the electromagnetic shielding circuit is adjusted according to the electromagnetic radiation intensity and the electromagnetic radiation direction, so that the enhancement of the shielding effect of the shell is realized. In the scheme, the static eliminating circuit detects the output current of the grounding end through the static detecting unit, judges whether static exists according to the magnitude of the current to be detected, and further starts the discharging unit to consume the static, so that the static is prevented from staying in the sensor and affecting the operation of the integral sensor.
Optionally, a plurality of cavities are arranged in the shell of the sensor, the electromagnetic shielding circuit is arranged in at least one cavity, and the control part controls the on-off of the electromagnetic shielding circuit at the corresponding position of the electromagnetic radiation direction and adjusts the power input into the electromagnetic shielding circuit according to the electromagnetic radiation direction and the electromagnetic radiation intensity detected by the electromagnetic radiation induction part.
Through adopting above-mentioned technical scheme, set up a plurality of electrified magnetism shielding circuit's cavity in the shell, through electromagnetic radiation intensity and electromagnetic radiation direction, with the electromagnetic shielding circuit on the corresponding direction switch on to strengthen the electromagnetic shielding performance of this corresponding direction. Compared with the conduction of electromagnetic shielding circuits of all cavities in the shell, the electromagnetic shielding circuit switching device only conduction one or more electromagnetic shielding circuits in a targeted manner, so that energy loss is reduced, and an accurate electromagnetic radiation shielding effect is realized.
Optionally, the control element searches the input ends of one or more electromagnetic shielding circuits in the corresponding area from a preset table according to the electromagnetic radiation direction and uses the input ends as target input ends, and the control element transmits the electric energy from the power supply unit to the target input ends to supply power.
By adopting the technical scheme, the input end of the corresponding electromagnetic shielding circuit is found according to the electromagnetic radiation direction, and the electromagnetic shielding circuit is conducted, so that the purpose of locking the electromagnetic shielding circuit in one direction according to the electromagnetic radiation direction is realized. Usually, the preset table is preset, and is directly applied in practice, so that the running speed is faster than that of direct calculation in the prior art.
Optionally, the control element obtains target power according to the electromagnetic radiation intensity and a preset power-intensity correspondence table, and inputs the target power to the target input end.
By adopting the technical scheme, the corresponding input power (namely target power) input to the electromagnetic shielding circuit is adjusted according to the detected electromagnetic radiation intensity, so that the working power of the corresponding electromagnetic shielding circuit is influenced, and the shielding effect of different electromagnetic shielding circuits is adjusted.
Optionally, the controlling means inputting the target power to the target input terminal further includes: attenuating the target power according to the position of the electromagnetic shielding circuit and the electromagnetic radiation direction to obtain input power corresponding to each electromagnetic shielding circuit; the control element controls the power input to the electromagnetic shielding circuit to be the corresponding input power.
By adopting the technical scheme, the input power of the control element input into each electromagnetic shielding circuit can be the same or different, and the input power corresponding to each different electromagnetic shielding circuit is set according to the position of the electromagnetic shielding circuit. Therefore, the scheme realizes further limitation of the power of the electromagnetic shielding circuit, and reduces the energy loss as much as possible on the premise of ensuring the electromagnetic shielding effect. For example, the input power corresponding to the electromagnetic shielding circuit facing the electromagnetic radiation direction is set as the target power, and the input power corresponding to the electromagnetic shielding circuit facing the electromagnetic radiation direction is generated after the target power is attenuated, and the attenuation degree is related to the position of the electromagnetic shielding circuit.
Optionally, the control circuit board further includes a timing unit, the timing unit is electrically connected with the control element, the timing unit counts time to obtain a current duration when detecting a power supply current between the control element and the electromagnetic shielding circuit, and the timing unit sends a cycle reminding signal to the control element when the current duration reaches a preset cycle duration;
and the control part reselects the target input end to supply power according to the current electromagnetic radiation information transmitted by the electromagnetic radiation induction part according to the periodic reminding signal.
By adopting the technical scheme, the control part periodically adjusts the target input end so as to ensure the stability of the shielding effect. The period of the control element adjusting target input end is limited by a timing unit, and the timing unit continuously calculates the power supply duration of the power supply current between the control element and the electromagnetic shielding circuit, wherein the power supply duration reflects the duration of entering the electromagnetic shielding circuit in the working state.
Optionally, the control part calculates a region to be shielded according to the electromagnetic radiation direction, takes the input ends of the one or more electromagnetic shielding circuits in the region to be shielded as target input ends, and controls the power supply unit to supply power to the target input ends.
By adopting the technical scheme, the control part calculates the area to be shielded according to the electromagnetic radiation direction, and compared with the direct table look-up, the mode of each calculation is more accurate. Then, the target input end selects one or more input ends of the electromagnetic shielding circuits in the areas to be shielded, so that the electromagnetic shielding circuits in the areas to be shielded are ensured to work, and the original electromagnetic shielding effect of the shell is enhanced.
Optionally, the static eliminating circuit includes a sampling Kang Tong and a discharging unit, the sampling Kang Tong is connected in series with the ground wire of the control circuit board, the control element is further used for detecting the current to be detected of the sampling Kang Tong, and when the current to be detected exceeds a preset value, the discharging unit is controlled to be connected in.
Through adopting above-mentioned technical scheme, when the control detects that the current that awaits measuring of flowing through sampling Kang Tong exceeds the default, can judge that static appears at present, later insert the both ends of sampling Kang Tong with the discharge unit to realize the further discharge to the static electric current, realize antistatic function.
Optionally, the charging wire of the power supply unit is connected with the passive filter in series, and the ground wire of the power supply unit is connected with the static electricity eliminating circuit.
Through adopting above-mentioned technical scheme, through passive filter and access static elimination circuit, realize the static protection to the marginless filter can effectively block the interference source from the transmission line, and static elimination circuit can eliminate the static from the transmission line.
Optionally, the housing of the sensor is made of metal material.
By adopting the technical scheme, the design of the metal shell can effectively prevent electromagnetic radiation.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the sensor not only isolates external electromagnetic interference through the shell, but also further shields the external electromagnetic interference through an electromagnetic shielding circuit of a cavity in the shell, and meanwhile, the influence of static electricity generated inside the sensor in the working application process is realized by adopting the static electricity eliminating circuit.
2. The electromagnetic shielding circuit in the corresponding direction is conducted through the electromagnetic radiation intensity and the electromagnetic radiation direction, so that the electromagnetic shielding performance in the corresponding direction is enhanced. Compared with the conduction of electromagnetic shielding circuits of all cavities in the shell, the electromagnetic shielding circuit switching device only conduction one or more electromagnetic shielding circuits in a targeted manner, so that energy loss is reduced, and an accurate electromagnetic radiation shielding effect is realized.
3. The corresponding input power (namely target power) input to the electromagnetic shielding circuit is adjusted according to the detected electromagnetic radiation intensity, so that the working power of the corresponding electromagnetic shielding circuit is influenced, and the shielding effect of different electromagnetic shielding circuits is adjusted. The input power of the control element input to each electromagnetic shielding circuit can be the same or different, and the input power corresponding to each different electromagnetic shielding circuit is set according to the position of the electromagnetic shielding circuit.
Drawings
FIG. 1 is a schematic structural diagram of an electromagnetic protection control device provided by the invention;
FIG. 2 is a schematic block diagram of the control circuit board of FIG. 1;
fig. 3 is a circuit schematic of the static elimination circuit of fig. 2.
Reference numerals illustrate:
sensor 100, housing 10, electromagnetic protection control device 20, cavity 101, cavity 102, control circuit board 21, power supply unit 22, electromagnetic shielding circuit 23, electromagnetic radiation inductor 211, control 212, static eliminating circuit 213, static detecting unit 2131, and bleeder unit 2132.
Detailed Description
The present application is described in further detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the inventive concepts. As part of this specification, some of the drawings of the present disclosure represent structures and devices in block diagram form in order to avoid obscuring the principles of the disclosure. In the interest of clarity, not all features of an actual implementation are necessarily described. Reference in the present disclosure to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment, and multiple references to "one embodiment" or "an embodiment" should not be understood as necessarily all referring to the same embodiment.
The terms "a," "an," and "the" are not intended to refer to a singular entity, but rather include the general class of which a particular example may be used for illustration, unless clearly defined. Thus, the use of the terms "a" or "an" may mean any number of at least one, including "one", "one or more", "at least one", and "one or more than one". The term "or" means any of the alternatives and any combination of alternatives, including all alternatives, unless alternatives are explicitly indicated as mutually exclusive. The phrase "at least one of" when combined with a list of items refers to a single item in the list or any combination of items in the list. The phrase does not require all of the listed items unless specifically so defined.
The first embodiment is:
a first embodiment of the present invention provides an electromagnetic protection control device. The electromagnetic protection control device is suitable for various sensors, as shown in fig. 1, the sensor 100 comprises a housing 10 and an electromagnetic protection control device 20, the housing 10 is provided with a cavity 101 and a cavity 102, and the cavity 20 is positioned in the middle. In some examples, sensor 100 may be an SF6 density measurement sensor.
The electromagnetic protection control device 200 provided in this embodiment includes a control circuit board 21 located in the cavity 10 of the sensor 100, a power supply unit 22 located in the cavity 10 of the sensor 100, and an electromagnetic shielding circuit 23 located in the cavity 102 of the housing 10 of the sensor 100, where the power supply unit 22 is electrically connected to the control circuit board 21, and the control circuit board 21 is electrically connected to the electromagnetic shielding circuit 23.
In some examples, as shown in fig. 1, the power supply unit 22 is disposed at the bottom of the cavity 10, and the power supply unit 202 is connected to a charging wire, where the charging wire penetrates through the housing, and one end of the charging wire is electrically connected to the power supply unit 202, and the other end is used for externally connecting a power source. In this example, the power supply unit 22 may be powered by a battery, or may be powered by a connection to an external power source, or the power supply unit 22 may be set as a storage battery, where the storage battery supplies power to the control circuit board 21, and the storage battery may be charged by the external power source.
In this embodiment, as shown in fig. 2, the power supply unit 22 continuously supplies power to the control circuit board 21, and the control circuit board 21 is used for transferring the received power of the power supply unit 22 to the electromagnetic shielding circuit 23. The control circuit board 21 controls the opening and closing of the electromagnetic shielding circuit 23 in the cavity 102 of the housing 10 according to the self condition, thereby realizing the activation of the electromagnetic shielding circuit 23 according to the self-detected electromagnetic radiation condition so as to strengthen the electromagnetic compatibility of the integral sensor.
As shown in fig. 2, the control circuit board 21 includes an electromagnetic radiation induction element 211, a control element 212, and a static electricity eliminating circuit 213, wherein the electromagnetic radiation induction element 211, the control element 212, and the static electricity eliminating circuit 213 are electrically connected to the power supply unit 22, and the power supply unit 21 supplies power to the electromagnetic radiation induction element 211, the control element 212, and the static electricity eliminating circuit 213 in the control circuit board 21. The control element 212 has a power supply input end, a power supply output end, an induction input end and a control output end, wherein the power supply input end is electrically connected with the power supply unit 21, the power supply output end is electrically connected with the electromagnetic shielding circuit 23, the induction input end is electrically connected with the electromagnetic radiation induction element 211, and the control output end is electrically connected with the static electricity eliminating circuit 213. Specifically, the electromagnetic radiation sensor 211 detects an electromagnetic radiation signal and transmits current electromagnetic radiation information, and the control member 212 controls the on-off of the electromagnetic shielding circuit and adjusts the power input into the electromagnetic shielding circuit according to the electromagnetic radiation information, wherein the current electromagnetic radiation information includes an electromagnetic radiation direction and an electromagnetic radiation intensity.
As shown in fig. 3, the static electricity eliminating circuit 213 is electrically connected to the static electricity detecting unit 2131 and the discharging unit 2132, all the grounding terminals igeeratrix of the control circuit board 21 are electrically connected to the input terminal of the discharging unit 2132 and the input terminal of the static electricity detecting unit 2131, the output terminal of the static electricity detecting unit 2131 is grounded, the output terminal of the discharging unit 2132 is grounded, the static electricity detecting unit 2131 detects the current to be measured and transmits the current to the control element 212, and the control element 212 outputs a discharging signal GUI to the discharging unit 2132 when the current to be measured exceeds a preset value, so that the discharging unit 2132 can be started.
In specific use, the sensor 100 not only isolates external electromagnetic interference through the housing 10, but also further shields external electromagnetic interference through the electromagnetic shielding circuit 23 of the cavity 102 in the housing 10, and meanwhile, the static eliminating circuit 213 is adopted to realize the influence of static electricity generated inside in the working and application process of the sensor 100.
The electromagnetic radiation sensor 211 detects the intensity and direction of electromagnetic radiation passing through the housing 10 to the inside of the sensor 100, and then the control member 212 adjusts the on-off state of the electromagnetic shielding circuit 23 according to the intensity and direction of electromagnetic radiation, thereby enhancing the shielding effect of the housing 10. In the static eliminating circuit 213, the static detecting unit 2131 detects the output current (i.e. the current to be measured) at the ground end, the control unit 212 determines whether static exists according to the magnitude of the output current, and further controls the opening and closing of the discharging unit 2132, and the discharging unit 2132 consumes the static, so as to prevent the static from staying inside the sensor 100 and affecting the operation of the whole sensor 100.
In some examples, the sensor 100 housing 10 has only one cavity 102, and the electromagnetic shielding circuit 23 is disposed in the cavity 102, and the shielding range of the electromagnetic shielding circuit 23 covers the inside of the sensor 100.
In some examples, as shown in fig. 1, the housing 10 of the sensor 100 is provided with a plurality of cavities 102, at least one cavity 102 is provided with the electromagnetic shielding circuit 23, and the control element 212 controls the electromagnetic shielding circuit 23 at a position corresponding to the electromagnetic radiation direction to be turned on or turned off and adjusts the power input to the electromagnetic shielding circuit 23 according to the electromagnetic radiation direction and the electromagnetic radiation intensity detected by the electromagnetic radiation induction element 211.
In this example, a plurality of cavities 102 with electromagnetic shielding circuits 23 are provided in the housing 10, and electromagnetic shielding circuits 23 are provided in the cavities 102 to realize electromagnetic radiation of detection devices in the sensor 100, so as to avoid interference of external electromagnetic radiation. For this purpose, the cavities 102 in the housing 10 are preferably uniformly distributed, wherein the cavities 102 with the electromagnetic shielding circuit 23 are uniformly distributed. The electromagnetic shielding circuit 23 may be arranged to fill all of the cavities 102 or may be arranged in all of the cavities 102 at intervals. While the uniform arrangement of the cavities 102 within the housing may be referred to as honeycomb. In a specific implementation, the electromagnetic radiation induction element 211 in the present case detects the intensity and direction of electromagnetic radiation, finds the electromagnetic shielding circuit 23 in the corresponding cavity 102 according to the electromagnetic radiation direction, and transmits the electric energy transmitted by the power supply unit 22 to the electromagnetic shielding circuits 23 according to the electromagnetic intensity so as to generate a corresponding electromagnetic shielding field by the electromagnetic shielding circuits 23, thereby avoiding external electromagnetic interference. In this example, compared to conducting the electromagnetic shielding circuits 23 of all the cavities 102 in the housing 10, only one or more electromagnetic shielding circuits 23 are purposefully conducted, so that energy loss is reduced, and an accurate electromagnetic radiation shielding effect is achieved.
In some examples, the control element 212 searches the input ends of the one or more electromagnetic shielding circuits 23 in the corresponding area from the preset table according to the electromagnetic radiation direction and uses the input ends as target input ends, and controls the power supply unit 22 to supply power to the target input ends.
In this example, the preset table includes the electromagnetic radiation direction range-the shielding region of the housing-the number of the cavity 102 within the shielding region of the housing; wherein the electromagnetic radiation direction range is preset, the shielding area of the housing refers to a corresponding range area indicated by the electromagnetic radiation direction range (the range area is represented by coordinates in a coordinate system established centering on the sensor 100), and the number in each cavity 102 is unique. The present case finds the corresponding numbers of the cavities 102 according to the electromagnetic radiation directions, then uses the input ends of the electromagnetic shielding circuits 23 in the corresponding cavities as target input ends, and uses the control element 212 to control the electric energy in the power supply unit 22 to be forwarded to the target input ends, so that the power supply unit 22 supplies power to the target input ends, and the purpose of locking the electromagnetic shielding circuits 23 in one direction according to the electromagnetic radiation directions is achieved. The preset table is preset, and is directly applied in practice, so that the running speed is faster compared with the direct calculation in the prior art.
In a further example, the control element 212 obtains a target power according to the electromagnetic radiation intensity and a preset power-intensity correspondence table, and inputs the target power to the target input terminal.
In this example, a power-intensity correspondence table is preset, which includes the electromagnetic radiation intensity range and the target power value. And finding out the electromagnetic radiation intensity range according to the electromagnetic radiation intensity, and taking the power value corresponding to the electromagnetic radiation intensity range as target power. The input power (i.e. target power) input to the electromagnetic shielding circuit 23 is adjusted according to the detected electromagnetic radiation intensity, so that the working power of the corresponding electromagnetic shielding circuit 23 is affected, and the shielding effect of different electromagnetic shielding circuits 23 is adjusted. Meanwhile, all the power of the electromagnetic shielding circuit 23 corresponding to the target input end adopts the same target power, so that the shielding effect is ensured.
In a further example, the control 212 inputting the target power to the target input further includes: attenuating the target power according to the position of the electromagnetic shielding circuit 23 and the electromagnetic radiation direction to obtain input power corresponding to each electromagnetic shielding circuit 23; the control 212 controls the power input to the electromagnetic shielding circuit 23 to the corresponding input power.
In this example, the input power of the control unit 212 to each electromagnetic shielding circuit 23 may be the same or different, and the input power corresponding to each different electromagnetic shielding circuit 23 is set according to the position of the electromagnetic shielding circuit 23. Specifically, the corresponding region is divided into a facing region and a side facing region, the facing region is located at a position pointed by the opposite direction of the electromagnetic radiation direction, and the side facing region is other regions except the facing region of the corresponding region. The control 212 inputs the target power P to the electromagnetic shielding circuit 23 located in the cavity 102 in the facing region.
The staff sets the attenuation coefficient x, calculates the minimum distance d between the cavity 102 located in the other area and the cavity 102 located in the target area, and calculates the power P '=p-d x of the cavity 102 located in the other area, at this time, sets the target power to attenuate with the attenuation coefficient x according to the distance d, so that the control element 212 inputs the target power P' to the electromagnetic shielding circuit 23 located in the cavity 102 located in the facing area.
Therefore, the scheme realizes further limitation of the power of the electromagnetic shielding circuit 23, and reduces the energy loss as much as possible on the premise of ensuring the electromagnetic shielding effect. For example, the input power corresponding to the electromagnetic shielding circuit 23 facing the electromagnetic radiation direction is set as the target power, and the input power corresponding to the electromagnetic shielding circuit 23 facing the electromagnetic radiation direction is attenuated by the target power, and the attenuation degree is related to the position of the electromagnetic shielding circuit 23.
In some examples, as shown in fig. 2, the control circuit board 21 further includes a timing unit 214, where the timing unit 214 is electrically connected to the control element 212, the timing unit 214 counts a current duration when detecting a supply current between the control element 212 and the electromagnetic shielding circuit 23, and when the current duration reaches a preset period duration, the timing unit 214 sends a period reminding signal to the control element 212;
the control element 212 re-selects the target input end to supply power according to the current electromagnetic radiation information transmitted by the electromagnetic radiation induction element 211 according to the periodic reminding signal.
By adopting the above technical solution, the control element 212 periodically adjusts the target input end, so as to ensure the stability of the shielding effect. Wherein the cycle of the control element adjustment target input terminal is limited by the timing unit 214, the timing unit 214 continuously calculates the power supply duration of the power supply current between the control element 212 and the electromagnetic shielding circuit 23, and the power supply duration reflects the duration of entering the electromagnetic shielding circuit 23 in the working state. The situation that the service life of the electromagnetic shielding circuit 23 is reduced due to frequent opening and closing of the electromagnetic shielding circuit 23 in the case of unstable external electromagnetic radiation is avoided.
In some examples, the control 212 calculates the area to be shielded according to the electromagnetic radiation direction, uses the input ends of the one or more electromagnetic shielding circuits 23 in the area to be shielded as target input ends, and controls the power supply unit 22 to supply power to the target input ends.
The calculation formula of the electromagnetic radiation direction-the region to be shielded is pre-stored in the scheme, and then the region to be shielded is calculated according to the vector corresponding to the electromagnetic radiation direction. The control 212 calculates the area to be shielded from the electromagnetic radiation direction, and the manner of each calculation appears to be more accurate than a direct look-up table. The target input then selects the input of one or more electromagnetic shielding circuits 23 in the areas to be shielded, thereby ensuring that the electromagnetic shielding circuits 23 in the areas to be shielded are operational and enhancing the original electromagnetic shielding effect of the housing 10.
In some examples, as shown in fig. 3, the static electricity eliminating circuit 213 includes a sample Kang Tong and a discharge unit 2132, the sample Kang Tong is connected in series with the ground of the control circuit board 21, the control element 212 is further configured to detect a voltage across the sample Kang Tong, and when the voltage exceeds a preset value, control the discharge unit 2132 to be connected in.
The samples Kang Tong include an R0N sample Kang Tong and an R0M sample Kang Tong, the control member 212 detects voltages at two ends of the sample Kang Tong, and calculates out a current to be measured in combination with a preset resistance value of the sample Kang Tong, when the current to be measured exceeds the preset value, it can be determined that static electricity is present, then a discharge signal GUI is generated and sent to the discharge unit 2132, and the discharge unit 2132 is connected to two ends of the sample Kang Tong according to the discharge signal GUI, so that further discharge of the static electricity is achieved, and an antistatic function is achieved.
In some examples, the charging line of the power supply unit 22 is connected in series with a passive filter, and the ground line of the power supply unit 22 is connected to the static electricity eliminating circuit 213.
In this example, the static electricity protection is achieved by the passive filter and the connected static electricity eliminating circuit 213, and the rimless filter can effectively block the interference source from the transmission line, and the static electricity eliminating circuit 213 can eliminate static electricity from the transmission line. Optionally, the housing 10 of the sensor 100 is made of a metal material; the design of the metal housing 10 can effectively eliminate electromagnetic radiation.
The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.
Claims (10)
1. An electromagnetic protection control device is used for a sensor and is characterized by comprising a control circuit board positioned in a cavity of the sensor, a power supply unit positioned in the cavity of the sensor and an electromagnetic shielding circuit positioned in a cavity in a shell of the sensor, wherein the power supply unit is electrically connected with the control circuit board, and the control circuit board is used for being electrically connected with the electromagnetic shielding circuit;
the control circuit board comprises an electromagnetic radiation induction piece, a control piece and a static electricity eliminating circuit, and the electromagnetic radiation induction piece, the control piece and the static electricity eliminating circuit are all electrically connected with the power supply unit; the control piece is provided with a power supply input end, a power supply output end, an induction input end and a control output end, wherein the power supply input end is electrically connected with the power supply unit, the power supply output end is electrically connected with the electromagnetic shielding circuit, the induction input end is electrically connected with the electromagnetic radiation induction piece, and the control output end is electrically connected with the static electricity eliminating circuit; the electromagnetic radiation induction piece detects electromagnetic radiation signals and transmits current electromagnetic radiation information, the control piece controls the on-off of the electromagnetic shielding circuit and adjusts the power input into the electromagnetic shielding circuit according to the electromagnetic radiation information, and the current electromagnetic radiation information comprises an electromagnetic radiation direction and electromagnetic radiation intensity;
the static elimination circuit is electrically connected with the static elimination unit and comprises a static detection unit and a discharge unit, all grounding ends of the control circuit board are respectively electrically connected with an input end of the discharge unit and an input end of the static detection unit, an output end of the static detection unit is grounded, an output end of the discharge unit is grounded, the static detection unit detects current to be detected and transmits the current to a control member, and the control member outputs a discharge signal to the discharge unit when the current to be detected exceeds a preset value so as to enable the discharge unit to start.
2. The electromagnetic protection control device according to claim 1, wherein a plurality of cavities are arranged in the shell of the sensor, the electromagnetic shielding circuit is arranged in at least one cavity, and the control part controls the on-off of the electromagnetic shielding circuit at the position corresponding to the electromagnetic radiation direction and adjusts the power input into the electromagnetic shielding circuit according to the electromagnetic radiation direction and the electromagnetic radiation intensity detected by the electromagnetic radiation induction piece.
3. The electromagnetic shield control device according to claim 2, wherein the control unit searches for the input end of one or more electromagnetic shield circuits of the corresponding area from a preset table according to the electromagnetic radiation direction and uses the input end as a target input end, and the control unit transmits the electric energy from the power supply unit to the target input end to supply power.
4. The electromagnetic shield control apparatus according to claim 3, wherein the control unit obtains a target power according to the electromagnetic radiation intensity and a preset power-intensity correspondence table, and inputs the target power to the target input terminal.
5. The electromagnetic shield control apparatus of claim 4 wherein the control inputting the target power to the target input further comprises: attenuating the target power according to the position of the electromagnetic shielding circuit and the electromagnetic radiation direction to obtain input power corresponding to each electromagnetic shielding circuit; the control element controls the power input to the electromagnetic shielding circuit to be the corresponding input power.
6. The electromagnetic protection control device according to claim 1, wherein the control circuit board further comprises a timing unit, the timing unit is electrically connected with the control member, the timing unit counts a current time length when detecting a supply current between the control member and the electromagnetic shielding circuit, and the timing unit sends a period reminding signal to the control member when the current time length reaches a preset period time length;
and the control part reselects the target input end to supply power according to the current electromagnetic radiation information transmitted by the electromagnetic radiation induction part according to the periodic reminding signal.
7. The electromagnetic protection control device according to claim 2, wherein the control unit calculates an area to be shielded according to the electromagnetic radiation direction, uses the input end of the one or more electromagnetic shielding circuits in the area to be shielded as a target input end, and controls the power supply unit to supply power to the target input end.
8. The electromagnetic shield control device according to claim 2, wherein the static elimination circuit includes a sample Kang Tong and a bleed unit, the sample Kang Tong being connected in series with the ground of the control circuit board, the control being further adapted to detect a current to be measured by the sample Kang Tong, and to control the bleed unit to be switched in when the current to be measured exceeds a preset value.
9. The electromagnetic shield control device according to claim 1, wherein the charging line of the power supply unit is connected in series with a passive filter, and the ground line of the power supply unit is connected to the static electricity eliminating circuit.
10. The electromagnetic shield control device according to claim 1, wherein the housing of the sensor is made of a metallic material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311721376.7A CN117715400A (en) | 2023-12-14 | 2023-12-14 | Electromagnetic protection control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311721376.7A CN117715400A (en) | 2023-12-14 | 2023-12-14 | Electromagnetic protection control device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117715400A true CN117715400A (en) | 2024-03-15 |
Family
ID=90161848
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311721376.7A Pending CN117715400A (en) | 2023-12-14 | 2023-12-14 | Electromagnetic protection control device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117715400A (en) |
-
2023
- 2023-12-14 CN CN202311721376.7A patent/CN117715400A/en active Pending
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