CN112611927B - Electromagnetic radiation adjusting device and method and electronic equipment - Google Patents
Electromagnetic radiation adjusting device and method and electronic equipment Download PDFInfo
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/001—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
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- G01R23/165—Spectrum analysis; Fourier analysis using filters
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
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- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
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Abstract
The invention provides an electromagnetic radiation adjusting device, an electromagnetic radiation adjusting method and electronic equipment, belongs to the technical field of servers, and solves the problems that in the EMC design and debugging stage, the capacitance value is debugged by disassembling a machine and a main board for multiple times, and time and labor are wasted. The device comprises a differential signal circuit, an electromagnetic analysis device, a switch circuit and a filtering regulation circuit, wherein the electromagnetic analysis device, the switch circuit and the filtering regulation circuit are connected with the differential signal circuit; the electromagnetic analysis device is used for analyzing the electromagnetic radiation value of the differential signal circuit; the switch circuit is used for turning off the output signal of the differential signal circuit when the electromagnetic radiation value is larger than a threshold value. The invention can avoid the waste of time of the disassembling and assembling machine caused by judging the noise source and changing the filtering capacitance value when the electromagnetic radiation noise exceeds the standard to the maximum extent. The field use cost is saved, and meanwhile, the problem that the test condition is changed due to the fact that the machine is inevitably moved in the problem judgment process can be guaranteed.
Description
Technical Field
The present invention relates to the field of server technologies, and in particular, to an electromagnetic radiation adjusting apparatus and method, and an electronic device.
Background
The server products develop towards high speed, high sensitivity, high integration and high stability, and the requirements on electromagnetic compatibility are more and more strict. For interconnection equipment of a high-speed digital system, the problem of electromagnetic radiation is increasingly prominent, the electromagnetic radiation not only affects the work of connecting the digital system, but also interferes other surrounding equipment, and therefore the problem of electromagnetic compatibility must be considered in the early stage of server design.
In engineering design, data transmission is generally performed by using differential signal pairs for longer-distance device interconnection, and for example, data transmission of physical layers of high-speed serial buses USB and SATA both use differential pairs.
Differential transmission is a signal transmission technology, and is different from the traditional method of one signal line and one ground wire, wherein the differential transmission transmits signals on the two lines, and the two signals have the same amplitude and opposite phases. The signals transmitted on these two lines are differential signals. If the polarity of the signal is the same (likewise, the direction of the current is the same), such a signal is called a common mode signal.
The signal receiving end compares the difference value of the two voltages to judge the logic state sent by the sending end. On a circuit board, the differential traces must be two lines that are equal in length, equal in width, closely adjacent, and on the same plane. The signal receiving end compares the difference value of the two voltages to judge whether the transmitting end sends logic 0 or logic 1.
The differential signal is composed of a differential mode component and a common mode component. Wherein: because the 2 signals of the differential mode component have opposite polarities, the coupling is better in the differential transmission line, and most of the radiation quantity is mutually cancelled. The amount of electromagnetic radiation it generates is small and the main factor causing the problem of electromagnetic radiation is the common mode component of the differential signal.
In an ideal case, the common mode signal is generally considered to be constant. Common mode signals typically do not carry information and therefore do not affect system performance. However, in practical situations, the common mode signal cannot be constant, the physical design of the differential interconnection lines cannot completely avoid external interference and internal signal misalignment, and small interference causes the change of the common mode component, thereby causing a potential electromagnetic radiation problem.
The prior art measures are as follows:
in the design process of a server product, due to the requirements of power consumption, heat dissipation and stability, most signal transmission adopts differential signal lines. In the design process of the differential line, the problem of electromagnetic radiation is avoided by depending on the working principle of the differential signal. The routing rule of the differential signal lines is usually relied on to avoid radiation problems, such as: it is essential to maintain a continuous characteristic impedance, proper termination matching and termination circuits, and T-shaped or right-angled routing is not required as much as possible. The reference plane is ensured to be continuous so as to make the loop area as short as possible. The characteristic impedance is ensured to be continuous so as to reduce the reflection of the signal. The ground plane is selected as a reference plane as much as possible.
At the place of wiring layer change, a via hole with a reference plane is properly added to ensure the integrity of a signal return path. The clock line and the synchronous data line are ensured to be on the same layer so as to minimize the transmission rate difference between different layers. The high-speed differential signal lines keep the differential line spacing constant and the wiring is equal in length, and if the wiring is not equal in length, phase mismatch may be caused, and the performance of the differential lines may be affected.
The disadvantages of the prior art are as follows:
1) The product is difficult to pass the EMC test at one time only depending on wiring specifications, and once the Fail is tested, the whole machine must be disassembled in the subsequent debugging process. The differential signal pair in question is measured by means of a spectrum analyzer and then a filter capacitance is added to the differential signal pair.
2) Due to the complexity of the electromagnetic problem, it is difficult to select an appropriate capacitance value at one time to solve the problem. The case and the mainboard must be disassembled for many times, which wastes time and labor.
Disclosure of Invention
The invention aims to provide an electromagnetic radiation adjusting device, an electromagnetic radiation adjusting method and electronic equipment, and solves the problems that in an EMC design and debugging stage, time and labor are wasted because a main board needs to be dismounted for debugging a capacitance value for multiple times. And because of the complexity of the electromagnetic compatibility problem, the test accuracy of the next test can be influenced by disassembling each time, after the scheme of the invention is introduced, the more accurate filtering capacitance value can be selected to carry out EMI filtering within the interval range of different capacitance values by controlling the CPLD while keeping the reinitialized test position of the original test prototype, the disassembling time is saved, and the use cost of a test field is effectively saved. And the damage and the loss of the main board caused by misoperation in the disassembly process can be avoided.
In a first aspect, the present invention provides an electromagnetic radiation adjusting apparatus, which includes a differential signal circuit, and an electromagnetic analyzing apparatus, a switching circuit and a filtering adjusting circuit connected to the differential signal circuit;
the electromagnetic analysis device is used for analyzing the electromagnetic radiation value of the differential signal circuit;
the switch circuit is used for turning off the output signal of the differential signal circuit when the electromagnetic radiation value is larger than a threshold value;
and the filtering adjusting circuit is used for adjusting and reducing the electromagnetic radiation when the electromagnetic radiation value is smaller than a threshold value after the output signal is closed.
Further, the switching circuit comprises an MOS transistor M1, an MOS transistor M2, an MOS transistor M5, an operational amplifier U1, a resistor R1, and a resistor R2;
the source electrode of the MOS transistor M1 inputs a positive input signal of the differential signal circuit, the drain electrode of the MOS transistor M1 outputs a positive output signal of the output signal, the source electrode of the MOS transistor M2 inputs a negative input signal of the differential signal circuit, the drain electrode of the MOS transistor M2 outputs a negative output signal of the output signal, the positive input end of the operational amplifier U1 inputs a first level signal, the negative input end of the operational amplifier U1 is grounded, the first output end of the operational amplifier U1 is grounded, the second output end of the operational amplifier U1 is connected to the gate electrode of the MOS transistor M5, the third output end of the operational amplifier U1 is connected to one end of the resistor R1 and one end of the resistor R2, the other end of the resistor R1 is connected to a power supply signal, the other end of the resistor R2 is connected to the gate electrode of the MOS transistor M1, the gate electrode of the MOS transistor M2 and the source electrode of the MOS transistor M5, and the drain electrode of the MOS transistor M5 is grounded.
Further, when the first level signal is a low level signal, the differential signal circuit outputs the output signal;
when the first level signal is a high level signal, the differential signal circuit turns off the output signal.
Further, the electromagnetic analysis device is further configured to determine whether the electromagnetic radiation value is smaller than a threshold value according to the first level signal.
Further, the filtering regulation circuit comprises a diode D1, a diode D2, a capacitor C1, a capacitor C2, an MOS transistor M3, and an MOS transistor M4;
the positive pole of the diode D1 is connected with the negative output signal of the output signal, the positive pole of the diode D2 is connected with the positive output signal of the output signal, the negative pole of the diode D1 is respectively connected with the negative pole of the diode D2, one end of the capacitor C1 and one end of the capacitor C2, the other end of the capacitor C1 is connected with the source electrode of the MOS tube M3, the other end of the capacitor C2 is connected with the source electrode of the MOS tube M4, the grid electrode of the MOS tube M3 inputs a second level signal, the grid electrode of the MOS tube M4 inputs a third level signal, and the drain electrode of the MOS tube M3 and the drain electrode of the MOS tube M4 are grounded.
Further, when the second level signal is at a high level, the capacitor C1 is connected to the differential signal circuit for filtering, so as to reduce electromagnetic radiation.
Further, when the third level signal is at a high level, the capacitor C2 is connected to the differential signal circuit for filtering, so as to reduce electromagnetic radiation.
In a second aspect, the present invention also provides a method of electromagnetic radiation conditioning, the method comprising:
analyzing the electromagnetic radiation value of the differential signal circuit;
turning off an output signal of the differential signaling circuit when the electromagnetic radiation value is greater than a threshold value;
and after the output signal is turned off, when the electromagnetic radiation value is smaller than a threshold value, adjusting to reduce the electromagnetic radiation.
In a third aspect, the present invention further provides an electronic device, which includes a memory and a processor, where the memory stores a computer program operable on the processor, and the processor implements the steps of the electromagnetic radiation adjusting method when executing the computer program.
In a fourth aspect, the invention also provides a computer readable storage medium having stored thereon machine executable instructions which, when invoked and executed by a processor, cause the processor to perform a method of electromagnetic radiation regulation.
The electromagnetic radiation adjusting device, the electromagnetic radiation adjusting method and the electronic equipment can avoid time waste of a disassembling and assembling machine caused by judging a noise source and changing a filter capacitance value when electromagnetic radiation noise exceeds the standard to the maximum extent. Practice thrift place use cost, can also guarantee simultaneously in the problem judgement process that the inevitable test condition that moves the machine and bring changes the problem, if test condition changes, the test result will appear the deviation, can cause the extravagant more time to go the variable reason of analysis, has solved in EMC design debugging stage, need tear the machine open many times, tear the mainboard open and debug the capacitance value, the problem that wastes time and energy. After the scheme of the invention is introduced, the EMI filtering can be carried out by selecting a more accurate filtering capacitance value within the range of different capacitance values by the control of the CPLD while maintaining the reinitialized testing position of the original testing prototype, thereby saving the time for disassembling the machine and effectively saving the use cost of a testing field. And the damage and the loss of the main board caused by misoperation in the disassembly process can be avoided.
Accordingly, the electronic device and the computer-readable storage medium provided by the embodiments of the present invention also have the above technical effects.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a block diagram of a structure provided by an embodiment of the present invention;
FIG. 2 is a circuit diagram provided by an embodiment of the present invention;
fig. 3 is a flow chart of an implementation provided in an embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "comprising" and "having," and any variations thereof, as referred to in embodiments of the present invention, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements but may alternatively include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Referring to fig. 1-3, an electromagnetic radiation adjusting apparatus according to an embodiment of the present invention includes a differential signal circuit, and an electromagnetic analyzing apparatus, a switching circuit and a filtering adjusting circuit connected to the differential signal circuit;
the electromagnetic analysis device is used for analyzing the electromagnetic radiation value of the differential signal circuit;
the switch circuit is used for closing the output signal of the differential signal circuit when the electromagnetic radiation value is larger than a threshold value;
and the filtering adjusting circuit is used for adjusting and reducing the electromagnetic radiation when the electromagnetic radiation value is smaller than the threshold value after the output signal is closed.
The invention can avoid the waste of time of the disassembly and assembly machine caused by judging the noise source and changing the filter capacitance value when the electromagnetic radiation noise exceeds the standard to the maximum extent. Practice thrift place use cost, can also guarantee simultaneously in the problem judgement process that the inevitable test condition that moves the machine and bring changes the problem, if test condition changes, the test result will appear the deviation, can cause the extravagant more time to go the variable reason of analysis, has solved in EMC design debugging stage, need tear the machine open many times, tear the mainboard open and debug the capacitance value, the problem that wastes time and energy. After the scheme of the invention is introduced, the EMI filtering can be carried out by selecting a more accurate filtering capacitance value within the range of different capacitance values under the control of the CPLD while maintaining the reinitialized testing position of the original testing prototype, thereby saving the time for disassembling the machine and effectively saving the use cost of a testing field. And the damage and the loss of the main board caused by misoperation in the disassembly process can be avoided.
In the embodiment of the invention, the switch circuit comprises an MOS tube M1, an MOS tube M2, an MOS tube M5, an operational amplifier U1, a resistor R1 and a resistor R2;
a positive input signal of the differential signal circuit is input to a source electrode of the MOS transistor M1, a positive output signal of the output signal is output from a drain electrode of the MOS transistor M1, a negative input signal of the differential signal circuit is input to a source electrode of the MOS transistor M2, a negative output signal of the output signal is output from a drain electrode of the MOS transistor M2, a first level signal is input to a positive input end of the operational amplifier U1, a negative input end of the operational amplifier U1 is grounded, a first output end of the operational amplifier U1 is grounded, a second output end of the operational amplifier U1 is connected to a gate electrode of the MOS transistor M5, a third output end of the operational amplifier U1 is connected to one ends of a resistor R1 and a resistor R2, the other end of the resistor R1 is connected to a power supply signal, the other end of the resistor R2 is connected to a gate electrode of the MOS transistor M1, a gate electrode of the MOS transistor M2 and a source electrode of the MOS transistor M5, and a drain electrode of the MOS transistor M5 is grounded.
In the embodiment of the invention, when the first level signal is a low level signal, the differential signal circuit outputs an output signal;
when the first level signal is a high level signal, the differential signal circuit turns off the output signal.
In an embodiment of the present invention, the electromagnetic analysis device is further configured to determine whether the electromagnetic radiation value is smaller than a threshold value according to the first level signal.
In the embodiment of the invention, the filtering regulating circuit comprises a diode D1, a diode D2, a capacitor C1, a capacitor C2, an MOS (metal oxide semiconductor) transistor M3 and an MOS transistor M4;
the positive pole of diode D1 links to each other with the negative-going output signal of output signal, the positive pole of diode D2 links to each other with the positive output signal of output signal, the negative pole of diode D1 links to each other with the negative pole of diode D2, the one end of electric capacity C1 and the one end of electric capacity C2 respectively, the other end of electric capacity C1 links to each other with MOS pipe M3's source electrode, the other end of electric capacity C2 links to each other with MOS pipe M4's source electrode, second level signal is inputed to MOS pipe M3's grid, third level signal is inputed to MOS pipe M4's grid, MOS pipe M3's drain electrode and MOS pipe M4's drain electrode ground connection.
In the embodiment of the invention, when the second level signal is at a high level, the capacitor C1 is connected to the differential signal circuit for filtering, so as to reduce electromagnetic radiation.
In the embodiment of the invention, when the third level signal is at a high level, the capacitor C2 is connected to the differential signal circuit for filtering, so as to reduce electromagnetic radiation.
The embodiment of the invention also provides an electromagnetic radiation adjusting method, which comprises the following steps:
analyzing the electromagnetic radiation value of the differential signal circuit;
when the electromagnetic radiation value is larger than the threshold value, the output signal of the differential signal circuit is closed;
and after the output signal is closed, when the electromagnetic radiation value is smaller than the threshold value, adjusting to reduce the electromagnetic radiation.
The embodiment of the present invention further provides an electronic device, which includes a memory and a processor, where the memory stores a computer program that can run on the processor, and the processor implements the steps of the electromagnetic radiation adjusting method when executing the computer program.
Embodiments of the present invention also provide a computer-readable storage medium having stored thereon machine-executable instructions that, when invoked and executed by a processor, cause the processor to execute an electromagnetic radiation adjustment method.
As shown in fig. 1, the embodiment of the present invention mainly includes two parts, and the corresponding implementation circuit includes two parts, namely, a differential signal pair switch circuit and a differential signal pair filter adjustment circuit. As shown in fig. 2:
the first part is: differential signal pair switching circuits.
The part has the main functions of:
when the test result exceeds the requirement of the limit value in the EMC semi-anechoic chamber. The switching circuits of the differential signal pairs are selectively opened. At this time, the path of the external output signal is cut off, and the electromagnetic radiation path of the common mode signal (i.e. common mode noise, common mode noise) is also cut off. If the electromagnetic radiation energy displayed on the spectrum analyzer is reduced or disappeared, the electromagnetic noise of the part is indicated to exceed the requirement of the regulation limit standard.
The second part is: and the differential signal pair filtering and adjusting circuit. After the differential signal pair with the common-mode noise is determined, the range of the filtering capacitance value can be determined without disassembling the machine and moving the original test environment by selecting the capacitance value of the filtering circuit. Two capacitors with capacitance values of 1000pf and 0.1uf exist in the circuit, and the capacitance values can be determined by respectively enabling the capacitors.
For example, a 1000pf capacitor is switched into the circuit, and if the common mode noise disappears or is reduced, the capacitance values are matched. If not, the capacitor of 0.1uf is connected into the circuit, and if the common mode noise disappears or is reduced, the capacitance value is matched.
The specific implementation of the embodiment of the present invention is shown in fig. 2 and 3. The specific implementation steps are as follows:
1) The N-type MOS transistors M1 and M2 are the switch part of the switch control circuit. When the CPLD _ GPIO1 is at a low level, the operational amplifier U1 has no output voltage to drive the N-type MOS transistor M5. Therefore, the N-type MOS transistors M1 and M2 are supplied with power from VCC _5V, and can be kept in a conducting state continuously. When the CPLD _ GPIO1 is at a high level, the operational amplifier U1 outputs a voltage, and the voltage drives the N-type MOS transistor M5 to conduct to ground. Therefore, the gate voltages of the N-type MOS transistors M1 and M2 are pulled low, and M1 and M2 can be kept off continuously.
2) The role of the backward diode D1 is to keep the differential signal pair connected to the same set of capacitors without causing short-circuiting between the differential signal pair.
3) And a filter circuit part, wherein C1 and M3 are connected in series. And the CPLD _ GPIO 2 controls the conduction and the closing of the N-type MOS tube. When the CPLD _ GPIO 2 outputs high level, M3 is conducted to the ground, and C1 is connected into the circuit and plays a role in filtering.
4) And a filter circuit part, wherein C2 is connected in series with M4. And the CPLD _ GPIO 3 controls the conduction and the closing of the N-type MOS tube. When the CPLD _ GPIO 3 outputs high level, the M4 is conducted to the ground, and the C2 is connected into the circuit and plays a role in filtering.
5) The access capacitance value can be determined by controlling the signals of CPLD _ GPIO 2 and CPLD _ GPIO 3, respectively. For example, when the CPLD _ GPIO 2 is at a high level and the CPLD _ GPIO 3 is at a low level, a 1000pf capacitor is connected to the circuit, and if the common mode noise disappears or decreases, the capacitance value matching is indicated. If the capacitance value is not matched, the CPLD _ GPIO 2 is at a low level, and the CPLD _ GPIO 3 is at a high level, the capacitance of 0.1uf is connected into the circuit, and if the common mode noise disappears or is reduced, the capacitance value matching is shown.
The apparatus provided by the embodiment of the present invention may be specific hardware on the device, or software or firmware installed on the device, etc. The device provided by the embodiment of the present invention has the same implementation principle and the same technical effects as those of the foregoing method embodiments, and for the sake of brief description, reference may be made to corresponding contents in the foregoing method embodiments for the parts of the device embodiments that are not mentioned. It can be clearly understood by those skilled in the art that, for convenience and simplicity of description, the specific working processes of the system, the apparatus and the unit described above may all refer to the corresponding processes in the method embodiments, and are not described herein again.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
Also for example, a partition of a unit may be a logical division, and in practice, there may be other partitions, and for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not implemented. In addition, the shown or discussed coupling or direct coupling or communication connection between each other may be through some communication interfaces, indirect coupling or communication connection between devices or units, and may be in an electrical, mechanical or other form.
Units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments provided by the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus once an item is defined in one figure, it need not be further defined and explained in subsequent figures, and moreover, the terms "first", "second", "third", etc. are used merely to distinguish one description from another and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; and the modifications, changes or substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention. Are intended to be covered by the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. An electromagnetic radiation adjusting device is characterized by comprising a differential signal circuit, an electromagnetic analysis device, a switch circuit and a filtering adjusting circuit, wherein the electromagnetic analysis device, the switch circuit and the filtering adjusting circuit are connected with the differential signal circuit;
the electromagnetic analysis device is used for analyzing the electromagnetic radiation value of the differential signal circuit;
the switch circuit is used for turning off the output signal of the differential signal circuit when the electromagnetic radiation value is larger than a threshold value;
the filtering adjusting circuit is used for adjusting and reducing electromagnetic radiation when the electromagnetic radiation value is smaller than a threshold value after the output signal is closed;
the filtering regulating circuit comprises a diode D1, a diode D2, a capacitor C1, a capacitor C2, an MOS tube M3 and an MOS tube M4;
the positive electrode of the diode D1 is connected with the negative output signal of the output signal, the positive electrode of the diode D2 is connected with the positive output signal of the output signal, the negative electrode of the diode D1 is respectively connected with the negative electrode of the diode D2, one end of the capacitor C1 and one end of the capacitor C2, the other end of the capacitor C1 is connected with the source electrode of the MOS tube M3, the other end of the capacitor C2 is connected with the source electrode of the MOS tube M4, the gate electrode of the MOS tube M3 inputs a second level signal, the gate electrode of the MOS tube M4 inputs a third level signal, and the drain electrode of the MOS tube M3 and the drain electrode of the MOS tube M4 are grounded;
when the second level signal is at a high level, the capacitor C1 is connected into the differential signal circuit for filtering so as to reduce electromagnetic radiation;
when the third level signal is at a high level, the capacitor C2 is connected to the differential signal circuit for filtering, so as to reduce electromagnetic radiation.
2. The apparatus of claim 1, wherein the switching circuit comprises a MOS transistor M1, a MOS transistor M2, a MOS transistor M5, an operational amplifier U1, a resistor R1, and a resistor R2;
the source electrode of the MOS transistor M1 inputs a positive input signal of the differential signal circuit, the drain electrode of the MOS transistor M1 outputs a positive output signal of the output signal, the source electrode of the MOS transistor M2 inputs a negative input signal of the differential signal circuit, the drain electrode of the MOS transistor M2 outputs a negative output signal of the output signal, the positive input end of the operational amplifier U1 inputs a first level signal, the negative input end of the operational amplifier U1 is grounded, the first output end of the operational amplifier U1 is grounded, the second output end of the operational amplifier U1 is connected to the gate electrode of the MOS transistor M5, the third output end of the operational amplifier U1 is connected to one end of the resistor R1 and one end of the resistor R2, the other end of the resistor R1 is connected to a power supply signal, the other end of the resistor R2 is connected to the gate electrode of the MOS transistor M1, the gate electrode of the MOS transistor M2 and the source electrode of the MOS transistor M5, and the drain electrode of the MOS transistor M5 is grounded.
3. The apparatus of claim 2, wherein the differential signaling circuit outputs the output signal when the first level signal is a low level signal;
and when the first level signal is a high level signal, the differential signal circuit closes the output signal.
4. The apparatus of claim 2, wherein the electromagnetic analysis device is further configured to determine whether the electromagnetic radiation value is less than a threshold value according to the first level signal.
5. The electromagnetic radiation adjusting method is characterized by being applied to an electromagnetic radiation adjusting device, wherein the device comprises a differential signal circuit, and an electromagnetic analysis device, a switching circuit and a filtering adjusting circuit which are connected with the differential signal circuit;
the filtering regulating circuit comprises a diode D1, a diode D2, a capacitor C1, a capacitor C2, an MOS tube M3 and an MOS tube M4;
the method comprises the following steps:
the electromagnetic analysis device analyzes the electromagnetic radiation value of the differential signal circuit;
the switch circuit turns off the output signal of the differential signal circuit when the electromagnetic radiation value is larger than a threshold value;
after the output signal is turned off, the filtering and adjusting circuit adjusts and reduces the electromagnetic radiation when the electromagnetic radiation value is smaller than a threshold value;
the positive electrode of the diode D1 is connected with the negative output signal of the output signal, the positive electrode of the diode D2 is connected with the positive output signal of the output signal, the negative electrode of the diode D1 is respectively connected with the negative electrode of the diode D2, one end of the capacitor C1 and one end of the capacitor C2, the other end of the capacitor C1 is connected with the source electrode of the MOS tube M3, the other end of the capacitor C2 is connected with the source electrode of the MOS tube M4, the gate electrode of the MOS tube M3 inputs a second level signal, the gate electrode of the MOS tube M4 inputs a third level signal, and the drain electrode of the MOS tube M3 and the drain electrode of the MOS tube M4 are grounded;
when the second level signal is at a high level, the capacitor C1 is connected into the differential signal circuit for filtering so as to reduce electromagnetic radiation; when the third level signal is at a high level, the capacitor C2 is connected to the differential signal circuit for filtering, so as to reduce electromagnetic radiation.
6. An electronic device comprising a memory and a processor, wherein the memory stores a computer program operable on the processor, and wherein the processor implements the steps of the method of claim 5 when executing the computer program.
7. A computer readable storage medium having stored thereon machine executable instructions which, when invoked and executed by a processor, cause the processor to perform the method of claim 5.
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| CN204515026U (en) * | 2015-02-03 | 2015-07-29 | 江汉大学 | A kind of device detecting electromagnetic radiation |
| CN110325025A (en) * | 2019-06-18 | 2019-10-11 | 中国船舶工业系统工程研究院 | A kind of system and method for reducing installation electromagnetical interference based on pulse modulated circuit |
| CN111951722A (en) * | 2020-08-29 | 2020-11-17 | 深圳市洲明科技股份有限公司 | Clock signal transmitter and receiver, clock circuit, receiving card and LED module |
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| FR2937150B1 (en) * | 2008-10-15 | 2010-12-24 | Soc Fr Detecteurs Infrarouges Sofradir | DEVICE AND METHOD FOR REALIZING THE READING OF ELECTRIC CURRENTS RESULTING FROM AN ELECTROMAGNETIC SIGNAL DETECTOR |
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| CN204515026U (en) * | 2015-02-03 | 2015-07-29 | 江汉大学 | A kind of device detecting electromagnetic radiation |
| CN110325025A (en) * | 2019-06-18 | 2019-10-11 | 中国船舶工业系统工程研究院 | A kind of system and method for reducing installation electromagnetical interference based on pulse modulated circuit |
| CN111951722A (en) * | 2020-08-29 | 2020-11-17 | 深圳市洲明科技股份有限公司 | Clock signal transmitter and receiver, clock circuit, receiving card and LED module |
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