CN115219821A - Electromagnetic compatibility monitoring circuit, method and system - Google Patents
Electromagnetic compatibility monitoring circuit, method and system Download PDFInfo
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- CN115219821A CN115219821A CN202210818796.6A CN202210818796A CN115219821A CN 115219821 A CN115219821 A CN 115219821A CN 202210818796 A CN202210818796 A CN 202210818796A CN 115219821 A CN115219821 A CN 115219821A
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- G01R31/001—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing
Abstract
The invention discloses an electromagnetic compatibility monitoring circuit, a method and a system, wherein the electromagnetic compatibility monitoring circuit comprises a microstrip antenna, an electromagnetic compatibility detection circuit and a complex programmable logic device, the output end of the microstrip antenna is connected with the input end of the electromagnetic compatibility detection circuit, and the output end of the electromagnetic compatibility detection circuit is connected with the input end of the complex programmable logic device; the complex programmable logic device is used for monitoring the voltage state of the output end of the electromagnetic compatibility detection circuit. The electromagnetic compatibility monitoring circuit, the method and the system can increase the monitoring capability of the server on electromagnetic interference, the electromagnetic compatibility monitoring circuit mainly comprises conventional materials such as a resistance-capacitance element and a triode, a microstrip antenna of a sensor part comprises PCB wiring, the whole circuit does not contain high-value materials, and the electromagnetic compatibility monitoring system is low in manufacturing cost, convenient to implement and convenient to apply in a large range.
Description
Technical Field
The invention belongs to the technical field of electronics, and particularly relates to an electromagnetic compatibility monitoring circuit, method and system.
Background
With the development of society, the rapid development of computing power cannot be left in the process from the rise of Internet economy, cloud computing to the upgrade and digital transformation of industrial Internet enabled national industries; the server supporting the development of computing power is more in need multiplication, and the server has high-speed CPU computing capability, long-time reliable operation capability, strong I/O external data throughput capability and strong expansibility. As the communication speed in the server increases, the problem of electromagnetic compatibility (EMC) becomes more prominent, which poses a challenge to the stability of the server.
At present, no monitoring measure is provided for the electromagnetic interference phenomenon inside the server, and the electromagnetic compatibility problem mainly weakens the influence of the electromagnetic interference in a mode of shielding a sensitive area and the like through EMC testing.
The electromagnetic compatibility condition in the server cannot be monitored, and although the EMC problem is improved during server design, the electromagnetic compatibility strength or the shielding effect of electromagnetic interference can be obviously changed along with the increase of the service life of the server, so that the improvement measures are invalid; if the data cannot be identified in time, obvious threats can be caused to the stability of the server, and the problems of data errors, equipment loss and the like are caused.
Disclosure of Invention
In order to solve the problems of the prior art, the invention provides an electromagnetic compatibility monitoring circuit, a method and a system, wherein the electromagnetic compatibility monitoring circuit comprises a microstrip antenna, an electromagnetic compatibility detection circuit and a complex programmable logic device, the output end of the microstrip antenna is connected with the input end of the electromagnetic compatibility detection circuit, and the output end of the electromagnetic compatibility detection circuit is connected with the input end of the complex programmable logic device; the complex programmable logic device is used for monitoring the voltage state of the output end of the electromagnetic compatibility detection circuit. The electromagnetic compatibility monitoring circuit, the method and the system can increase the monitoring capability of the server on electromagnetic interference, the electromagnetic compatibility monitoring circuit mainly comprises conventional materials such as a resistance-capacitance element and a triode, a microstrip antenna of a sensor part comprises PCB wiring, the whole circuit does not contain high-value materials, and the electromagnetic compatibility monitoring system is low in manufacturing cost, convenient to implement and convenient to apply in a large range.
The technical scheme is as follows:
in a first aspect, the present invention provides an electromagnetic compatibility monitoring circuit, which comprises a microstrip antenna, an electromagnetic compatibility detection circuit, and a complex programmable logic device,
the output end of the microstrip antenna is connected with the input end of the electromagnetic compatibility detection circuit, and the output end of the electromagnetic compatibility detection circuit is connected with the input end of the complex programmable logic device;
the electromagnetic compatibility detection circuit comprises a first triode, a second triode, a third triode and a power supply, wherein the base of the first triode is connected with the output end of the microstrip antenna, the emitting electrode of the first triode is grounded, and the collecting electrode of the first triode is connected with the base of the second triode and the output end of the power supply; the base electrode of the second triode is grounded with the emitting electrode of the second triode, and the collector electrode of the second triode is connected with the base electrode of the first triode, the base electrode of the third triode and the output end of the power supply; the emitter of the third triode is grounded, and the collector of the third triode is connected with the output end of the power supply and the input end of the complex programmable logic device; a collector of the third triode is used as an output end of the electromagnetic compatibility detection circuit;
the complex programmable logic device is used for monitoring the voltage state of the output end of the electromagnetic compatibility detection circuit.
In some embodiments, the EMC detection circuit further includes a first resistor, a second resistor,
the first end of the first resistor is connected with the output end of the microstrip antenna, and the second end of the first resistor is connected with the first end of the second resistor and the base electrode of the first triode; a first end of the first resistor is used as an input end of the electromagnetic compatibility detection circuit;
the second end of the second resistor is connected with the output end of the power supply, the base of the third triode and the collector of the second triode;
the first resistor and the second resistor are used for dividing the base voltage of the first triode.
In some embodiments, the EMC detection circuit further includes a third resistor, a fourth resistor,
the first end of the third resistor is connected with the collector of the first triode and the first end of the fourth resistor, and the second end of the third resistor is connected with the base of the second triode;
a second end of the fourth resistor is grounded;
the third resistor and the fourth resistor are used for adjusting the sensitivity of the microstrip antenna by changing the resistance value.
In some embodiments, the EMC detection circuit further includes a fifth resistor, a sixth resistor,
a first end of the fifth resistor is connected with an output end of the power supply and a second end of the sixth resistor, and a second end of the fifth resistor is connected with a second end of the second resistor, a base of the third triode and a collector of the second triode;
the first end of the sixth resistor is connected with the collector of the first triode;
the fifth resistor is used for adjusting the voltage rise time of the base electrode of the first triode;
the sixth resistor is used for adjusting the voltage rising time of the base electrode of the second triode.
In some embodiments, the EMC detection circuit further includes a seventh resistor, an eighth resistor,
the seventh resistor is connected between the second resistor and the base of the third triode;
and the eighth resistor is connected between the collector of the third triode and the output end of the power supply.
In some embodiments, the EMC detection circuit further includes a first capacitance,
the first end of the first capacitor is connected with the second end of the fourth resistor, and the second end of the first capacitor is grounded;
the first capacitor is used for adjusting the voltage rise time of the base electrode of the second triode.
In some embodiments, the complex programmable logic device includes an analog-to-digital converter,
the analog-digital converter is used for detecting the voltage of the collector electrode of the third triode.
In some embodiments, the EMC monitoring circuit further comprises a baseboard management controller,
and the output end of the complex programmable logic device is connected with the substrate management controller through an I2C bus.
In some embodiments, the first transistor, the second transistor, and the third transistor are NPN transistors.
In a second aspect, the present invention further provides an electromagnetic compatibility monitoring method, including:
the complex programmable logic device monitors the voltage state of the output end of the electromagnetic compatibility detection circuit;
when the voltage state of the output end of the electromagnetic compatibility detection circuit changes repeatedly, the complex programmable logic device reports the alarm information that the electromagnetic compatibility monitoring exceeds the standard to a substrate management controller;
and the baseboard management controller inquires the register value of the complex programmable logic device in a polling mode, confirms the position of the alarm of which the electromagnetic compatibility monitoring exceeds the standard, and reports the position information of the alarm of which the electromagnetic compatibility monitoring exceeds the standard to an equipment operation and maintenance system.
In a third aspect, the present invention also provides an emc monitoring system, which includes the emc monitoring circuit according to any one of the first aspect.
The technical scheme disclosed by the embodiment of the invention has the beneficial effects that:
the invention discloses an electromagnetic compatibility monitoring circuit, a method and a system, wherein the electromagnetic compatibility monitoring circuit comprises a microstrip antenna, an electromagnetic compatibility detection circuit and a complex programmable logic device, the output end of the microstrip antenna is connected with the input end of the electromagnetic compatibility detection circuit, and the output end of the electromagnetic compatibility detection circuit is connected with the input end of the complex programmable logic device; the complex programmable logic device is used for monitoring the voltage state of the output end of the electromagnetic compatibility detection circuit. The electromagnetic compatibility monitoring circuit, the method and the system can improve the monitoring capability of the server on electromagnetic interference, the electromagnetic compatibility monitoring circuit mainly comprises conventional materials such as a resistance-capacitance element and a triode, a microstrip antenna of a sensor part comprises a PCB (printed circuit board) wiring, the whole circuit does not contain high-value materials, and the electromagnetic compatibility monitoring system is low in manufacturing cost, convenient to implement and convenient to apply in a large range.
The technical scheme disclosed by the embodiment of the invention has a simple structure, and the detection circuit is formed by utilizing the conduction characteristic of the triode and the characteristic of the microstrip antenna for receiving electromagnetic waves of different frequency bands, so that the monitoring measure of the electromagnetic interference of the server is enhanced at lower cost, and the performance of the server is more stable; the electromagnetic compatibility monitoring circuit sacrifices details such as sampling resolution and the like, and the implementation cost is greatly saved.
The technical scheme disclosed by the embodiment of the invention has low cost and flexible design, and can carry out targeted detection on EMC interference sources with different frequency bands and different intensities by modifying the wiring mode of the microstrip antenna or modifying the resistance-capacitance value in the detection circuit.
The technical scheme disclosed by the embodiment of the invention can also be used as an independent circuit, namely designed as a handheld device, and the microstrip antenna part is used as a detection head for searching or detecting EMC interference sources or other electromagnetic noises.
Drawings
The above features and advantages of the present disclosure will be better understood upon reading the detailed description of embodiments thereof in conjunction with the following drawings. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a general block diagram of an EMC monitoring circuit according to the present invention;
FIG. 2 is a detailed circuit diagram of the EMC monitoring circuit according to the present invention;
FIG. 3 is a flow chart of an electromagnetic compatibility monitoring method of the present invention;
the attached drawings are marked as follows:
t1, a first triode; t2, a second triode; t3, a third triode; r1 and a first resistor; r2 and a second resistor; r3 and a third resistor; r4 and a fourth resistor; r5 and a fifth resistor; r6 and a sixth resistor; r7 and a seventh resistor; r8 and an eighth resistor; c1, a first capacitor; VCC and a power supply.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
It should be noted that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, "plurality" or "a number" means two or more unless specifically limited otherwise.
Example one
An embodiment of the present invention provides an electromagnetic compatibility monitoring circuit, as shown in fig. 1, the electromagnetic compatibility monitoring circuit includes a microstrip antenna, an electromagnetic compatibility detection circuit, and a complex programmable logic device,
the output end of the microstrip antenna is connected with the input end of the electromagnetic compatibility detection circuit, and the output end of the electromagnetic compatibility detection circuit is connected with the input end of the complex programmable logic device;
as shown in fig. 2, the electromagnetic compatibility detection circuit includes a first triode T1, a second triode T2, a third triode T3, and a power supply VCC, wherein a base of the first triode T1 is connected to an output terminal of the microstrip antenna, an emitter of the first triode T1 is grounded, and a collector of the first triode T1 is connected to a base of the second triode T2 and an output terminal of the power supply VCC; the base electrode of the second triode T2 is grounded with the emitting electrode of the second triode T2, and the collector electrode of the second triode T2 is connected with the base electrode of the first triode T1, the base electrode of the third triode T3 and the output end of the power supply VCC; an emitting electrode of the third triode T3 is grounded, and a collector electrode of the third triode T3 is connected with an output end of the power supply VCC and an input end of the complex programmable logic device; a collector electrode of the third triode T3 is used as an output end of the electromagnetic compatibility detection circuit;
the complex programmable logic device is used for monitoring the voltage state of the output end of the electromagnetic compatibility detection circuit.
Specifically, in this embodiment, the microstrip antenna is configured to receive electromagnetic interference and noise signals, and the microstrip antenna is mainly formed by a PCB surface trace, and the frequency band and the sensitivity of the received signal of the microstrip antenna can be adjusted by adjusting the wiring manner of the microstrip antenna.
Here, the Complex Programmable Logic Device (CPLD) is configured to monitor a voltage state of the output end of the emc detection circuit, that is, detect a voltage output state of the collector of the third transistor T3, and when the CPLD monitors that a level state of the output end of the emc detection circuit repeatedly changes, the CPLD reports an alarm message to a Baseboard Management Controller (BMC) Management system.
In this embodiment, the emc detection circuit further includes a first resistor R1 and a second resistor R2,
the first end of the first resistor R1 is connected with the output end of the microstrip antenna, and the second end of the first resistor R1 is connected with the first end of the second resistor R2 and the base electrode of the first triode T1; a first end of the first resistor R1 is used as an input end of the electromagnetic compatibility detection circuit;
the second end of the second resistor R2 is connected with the output end of the power supply VCC, the base of the third triode T3 and the collector of the second triode T2;
the first resistor R1 and the second resistor R2 are used for dividing the base voltage of the first triode T1.
Specifically, when electromagnetic interference occurs or the intensity of the electromagnetic interference increases, the base voltage of the first triode T1 rises, and different voltage division effects can be obtained by adjusting the resistance values of the first resistor R1 and the second resistor R2; meanwhile, the resistance values of the first resistor R1 and the second resistor R2 can be modified to control the interference intensity of the electromagnetic compatibility detection circuit for receiving electromagnetic interference.
Here, in the emc detection circuit, since the collector of the first transistor T1 is connected to the base of the second transistor T2, and the collector of the second transistor T2 is simultaneously connected to the base of the first transistor T1, that is, the first transistor T1 and the second transistor T2 form an interlocking circuit; after the electromagnetic interference intensity is enhanced, the voltage and the current of the base electrode of the first triode T1 are increased, the stable structure of the interlocking of the first triode T1 and the second triode T2 is broken, namely the interlocking state is turned over to the cut-off of the second triode T2, and the first triode T1 and the third triode T3 are conducted; or the second triode T2 is turned on, and the first triode T1 and the third triode T3 are turned over continuously in a cut-off state.
In this embodiment, the emc detection circuit further includes a third resistor R3 and a fourth resistor R4,
a first end of the third resistor R3 is connected to a collector of the first triode T1 and a first end of the fourth resistor R4, and a second end of the third resistor R3 is connected to a base of the second triode T2;
the second end of the fourth resistor R4 is grounded;
the third resistor R3 and the fourth resistor R4 are used for adjusting the sensitivity of the microstrip antenna by changing the resistance value.
Specifically, the electromagnetic compatibility detection circuit is configured to detect whether electromagnetic interference and noise signals received by the microstrip antenna exceed a standard preset value by 200mV; the first triode T1 is used for receiving electromagnetic interference and noise signals, amplifying and outputting the electromagnetic interference and noise signals, and meanwhile, filtering the electromagnetic interference and noise signals through the third resistor R3, the fourth resistor R4 and the first capacitor C1 and outputting the filtered electromagnetic interference and noise signals to the second triode T2; therefore, the microstrip antenna can adjust the sensitivity of the microstrip antenna by adjusting the wiring mode of the microstrip antenna and adjusting the parameter values of the third resistor R3, the fourth resistor R4 and the first capacitor C1; the second triode T2 continuously amplifies the filtered and shaped electromagnetic interference signal and outputs the amplified electromagnetic interference signal to the third triode T3, and the third triode T3 outputs the final electromagnetic interference signal to the analog-to-digital converter.
The electromagnetic environment noise of the test board card in the standard test environment serves as a preset value, and when the analog-digital converter detects that the maximum value of the electromagnetic noise is 200mV higher than the preset value continuously, the maximum value of the electromagnetic noise is uploaded to the substrate management controller to be alarmed.
In this embodiment, the emc detection circuit further includes a fifth resistor R5 and a sixth resistor R6,
a first end of the fifth resistor R5 is connected to an output end of the power supply VCC and a second end of the sixth resistor R6, and a second end of the fifth resistor R5 is connected to a second end of the second resistor R2, a base of the third triode T3, and a collector of the second triode T2;
a first end of the sixth resistor R6 is connected to a collector of the first triode T1;
the fifth resistor R5 is used for adjusting the voltage rise time of the base of the first triode T1;
the sixth resistor R6 is configured to adjust a voltage rise time of the base of the second transistor T2.
Specifically, in the electromagnetic compatibility detection circuit, since the collector of the first transistor T1 is connected to the base of the second transistor T2, and the collector of the second transistor T2 is simultaneously connected to the base of the first transistor T1, that is, the two transistors of the first transistor T1 and the second transistor T2 form an interlocking circuit; in a circuit saturation state, only one of the first triode T1 and the second triode T2 is allowed to be conducted; under the condition of low electromagnetic interference intensity, for example, when a server is shut down, after a power supply VCC is powered on, the first capacitor C1 may be configured to adjust a rise time of a base voltage of the second triode T2, where the rise time of the base voltage of the first triode T1 is mainly determined by a pull-up resistor fifth resistor R5, and the first capacitor C1 and the sixth resistor R6 may be configured to adjust a rise time of the base voltage of the second triode T2, that is, reducing parameter values of the first capacitor C1 and the sixth resistor R6 may reduce the rise time of the base voltage of the second triode T2, so that the second triode T2 reaches a conducting state first, and the base voltage of the first triode T1 is locked to a low level; and under the condition that does not have electromagnetic interference EMC, after power supply VCC got into the steady state after the electricity, first triode T1 with third triode T3 ends, second triode T2 switches on, analog-to-digital converter detects the voltage of electromagnetic compatibility detection circuitry's output is the high level, and the voltage of this moment electromagnetic compatibility detection circuitry's output equals or is close to power supply VCC's voltage value.
In this embodiment, the emc detection circuit further includes a seventh resistor R7 and an eighth resistor R8,
the seventh resistor R7 is connected between the second resistor R2 and the base of the third triode T3;
the eighth resistor R8 is connected between the collector of the third triode T3 and the output terminal of the power supply VCC.
In this embodiment, the emc detection circuit further includes a first capacitor C1,
a first end of the first capacitor C1 is connected to a second end of the fourth resistor R4, and a second end of the first capacitor C1 is grounded;
the first capacitor C1 is used for adjusting the voltage rise time of the base of the second triode T2.
In this embodiment, the complex programmable logic device further comprises an analog-to-digital converter,
the Analog-to-digital converter (ADC) is configured to detect a voltage of a collector of the third transistor T3. The analog-to-digital converter, i.e. a/D converter, or ADC for short, refers to an electronic component that converts an analog signal into a digital signal. A typical analog-to-digital converter converts an input voltage signal into an output digital signal.
In this embodiment, the emc monitoring circuit further includes a bmc,
and the output end of the complex programmable logic device is connected with the substrate management controller through an I2C bus.
In this embodiment, the first transistor T1, the second transistor T2, and the third transistor T3 are NPN transistors.
The technical scheme disclosed by the embodiment of the invention has the beneficial effects that:
the invention discloses an electromagnetic compatibility monitoring circuit, which comprises a microstrip antenna, an electromagnetic compatibility detection circuit and a complex programmable logic device, wherein the output end of the microstrip antenna is connected with the input end of the electromagnetic compatibility detection circuit; the complex programmable logic device is used for monitoring the voltage state of the output end of the electromagnetic compatibility detection circuit. The electromagnetic compatibility monitoring circuit can improve the monitoring capability of a server on electromagnetic interference, the electromagnetic compatibility monitoring circuit mainly comprises conventional materials such as a resistance-capacitance element and a triode, a microstrip antenna of a sensor part is formed by PCB wiring, the whole circuit does not contain high-value materials, and an electromagnetic compatibility monitoring system is low in manufacturing cost, convenient to implement and convenient to apply in a large range.
The technical scheme disclosed by the embodiment of the invention has low cost and flexible design, and can carry out targeted detection on EMC interference sources with different frequency bands and different strengths by modifying the wiring mode of the microstrip antenna or modifying the resistance-capacitance value in the detection circuit.
Example two
The invention provides an electromagnetic compatibility monitoring method, as shown in fig. 3, the method comprises the following steps:
and S1, monitoring the voltage state of the output end of the electromagnetic compatibility detection circuit by the complex programmable logic device.
And S2, when the voltage state of the output end of the electromagnetic compatibility detection circuit changes repeatedly, the complex programmable logic device reports the alarm information that the electromagnetic compatibility monitoring exceeds the standard to the substrate management controller.
And S3, the baseboard management controller inquires the register value of the complex programmable logic device in a polling mode, confirms the position of the alarm of which the electromagnetic compatibility monitoring exceeds the standard, and reports the position information of the alarm of which the electromagnetic compatibility monitoring exceeds the standard to an equipment operation and maintenance system.
Specifically, in this embodiment, when the server motherboard is designed, the electromagnetic compatibility detection circuit is placed in an electromagnetic interference sensitive area for monitoring; for example, for a common electromagnetic interference source of 30MHz to 300MHz, the corresponding microstrip antenna is designed to enhance the receiving effect of the electromagnetic interference source of 30MHz to 300 MHz; when the server works, the complex programmable logic device continuously monitors the level state of the output end of the electromagnetic compatibility detection circuit; the substrate management controller polls an analog-digital converter chip of the complex programmable logic device through an I2C bus and inquires the voltage state of the output end of the electromagnetic compatibility detection circuit; when the voltage state of the output end of the electromagnetic compatibility detection circuit is continuously changed, the complex programmable logic device reports the alarm information that the electromagnetic compatibility monitoring exceeds the standard to a substrate management controller; and the baseboard management controller checks the register value of the complex programmable logic device in a polling mode, confirms the position of the alarm of the electromagnetic compatibility monitoring standard exceeding, and reports the position to the server operation and maintenance system to remind operation and maintenance personnel to explain that the server has risks and needs to be overhauled in time.
The technical scheme disclosed by the embodiment of the invention has the beneficial effects that:
the technical scheme disclosed by the embodiment of the invention has low cost and flexible design, and can carry out targeted detection on EMC interference sources with different frequency bands and different strengths by modifying the wiring mode of the microstrip antenna or modifying the resistance-capacitance value in the detection circuit.
The technical scheme disclosed by the embodiment of the invention can also be used as an independent circuit, namely designed as a handheld device, and the microstrip antenna part is used as a detection head for searching or detecting EMC interference sources or other electromagnetic noises.
EXAMPLE III
The invention provides an electromagnetic compatibility monitoring system, which comprises an electromagnetic compatibility monitoring circuit, wherein the electromagnetic compatibility monitoring circuit comprises a microstrip antenna, an electromagnetic compatibility detection circuit and a complex programmable logic device,
the output end of the microstrip antenna is connected with the input end of the electromagnetic compatibility detection circuit, and the output end of the electromagnetic compatibility detection circuit is connected with the input end of the complex programmable logic device;
the electromagnetic compatibility detection circuit comprises a first triode T1, a second triode T2, a third triode T3 and a power supply VCC, wherein the base of the first triode T1 is connected with the output end of the microstrip antenna, the emitting electrode of the first triode T1 is grounded, and the collecting electrode of the first triode T1 is connected with the base of the second triode T2 and the output end of the power supply VCC; the base electrode of the second triode T2 is grounded with the emitting electrode of the second triode T2, and the collector electrode of the second triode T2 is connected with the base electrode of the first triode T1, the base electrode of the third triode T3 and the output end of the power supply VCC; an emitting electrode of the third triode T3 is grounded, and a collector electrode of the third triode T3 is connected with an output end of the power supply VCC and an input end of the complex programmable logic device; a collector electrode of the third triode T3 is used as an output end of the electromagnetic compatibility detection circuit;
the complex programmable logic device is used for monitoring the voltage state of the output end of the electromagnetic compatibility detection circuit.
In some embodiments, the EMC detection circuit further includes a first resistor R1, a second resistor R2,
the first end of the first resistor R1 is connected with the output end of the microstrip antenna, and the second end of the first resistor R1 is connected with the first end of the second resistor R2 and the base electrode of the first triode T1; a first end of the first resistor R1 is used as an input end of the electromagnetic compatibility detection circuit;
the second end of the second resistor R2 is connected with the output end of the power supply VCC, the base of the third triode T3 and the collector of the second triode T2;
the first resistor R1 and the second resistor R2 are used for dividing the base voltage of the first triode T1.
In some embodiments, the EMC detection circuit further includes a third resistor R3, a fourth resistor R4,
a first end of the third resistor R3 is connected to a collector of the first triode T1 and a first end of the fourth resistor R4, and a second end of the third resistor R3 is connected to a base of the second triode T2;
the second end of the fourth resistor R4 is grounded;
the third resistor R3 and the fourth resistor R4 are used for adjusting the sensitivity of the microstrip antenna by changing the resistance value.
In some embodiments, the EMC detection circuit further includes a fifth resistor R5, a sixth resistor R6,
a first end of the fifth resistor R5 is connected to an output end of the power supply VCC and a second end of the sixth resistor R6, and a second end of the fifth resistor R5 is connected to a second end of the second resistor R2, a base of the third triode T3, and a collector of the second triode T2;
a first end of the sixth resistor R6 is connected to a collector of the first triode T1;
the fifth resistor R5 is used for adjusting the voltage rise time of the base electrode of the first triode T1;
the sixth resistor R6 is used for adjusting the voltage rise time of the base of the second triode T2.
In some embodiments, the emc detection circuit further includes a seventh resistor R7, an eighth resistor R8,
the seventh resistor R7 is connected between the second resistor R2 and the base of the third triode T3;
the eighth resistor R8 is connected between the collector of the third triode T3 and the output terminal of the power supply VCC.
In some embodiments, the EMC detection circuit further includes a first capacitor C1,
a first end of the first capacitor C1 is connected to a second end of the fourth resistor R4, and a second end of the first capacitor C1 is grounded;
the first capacitor C1 is used for adjusting the voltage rise time of the base of the second triode T2.
In some embodiments, the complex programmable logic device includes an analog-to-digital converter,
the analog-digital converter is used for detecting the voltage of the collector electrode of the third triode T3.
In some embodiments, the EMC monitoring circuit further comprises a baseboard management controller,
and the output end of the complex programmable logic device is connected with the substrate management controller through an I2C bus.
In some embodiments, the first transistor T1, the second transistor T2, and the third transistor T3 are NPN transistors.
The technical scheme disclosed by the embodiment of the invention has a simple circuit structure, and utilizes the conduction characteristic of the triode and the characteristic of the microstrip antenna for receiving electromagnetic waves of different frequency bands to form a detection circuit, thereby enhancing the monitoring measure of the electromagnetic interference of the server with lower cost and ensuring that the performance of the server is more stable; the electromagnetic compatibility monitoring system sacrifices details such as sampling resolution and the like, and greatly saves implementation cost.
The technical scheme disclosed by the embodiment of the invention has low cost and flexible design, and can carry out targeted detection on EMC interference sources with different frequency bands and different intensities by modifying the wiring mode of the microstrip antenna or modifying the resistance-capacitance value in the detection circuit.
The technical scheme disclosed by the embodiment of the invention can also be used as an independent circuit, namely designed as a handheld device, and the microstrip antenna part is used as a detection head for searching or detecting EMC interference sources or other electromagnetic noises.
All the above optional technical solutions may be combined arbitrarily to form optional embodiments of the present invention, and are not described in detail herein.
While preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all changes and modifications that fall within the true scope of the embodiments of the present application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Those not described in detail in this specification are within the skill of the art.
Claims (10)
1. An electromagnetic compatibility monitoring circuit is characterized in that the electromagnetic compatibility monitoring circuit comprises a microstrip antenna, an electromagnetic compatibility detection circuit and a complex programmable logic device,
the output end of the microstrip antenna is connected with the input end of the electromagnetic compatibility detection circuit, and the output end of the electromagnetic compatibility detection circuit is connected with the input end of the complex programmable logic device;
the electromagnetic compatibility detection circuit comprises a first triode, a second triode, a third triode and a power supply, wherein the base of the first triode is connected with the output end of the microstrip antenna, the emitting electrode of the first triode is grounded, and the collecting electrode of the first triode is connected with the base of the second triode and the output end of the power supply; the base electrode of the second triode is grounded with the emitting electrode of the second triode, and the collector electrode of the second triode is connected with the base electrode of the first triode, the base electrode of the third triode and the output end of the power supply; the emitter of the third triode is grounded, and the collector of the third triode is connected with the output end of the power supply and the input end of the complex programmable logic device; a collector of the third triode is used as an output end of the electromagnetic compatibility detection circuit;
the complex programmable logic device is used for monitoring the voltage state of the output end of the electromagnetic compatibility detection circuit.
2. The EMC monitoring circuit of claim 1, further comprising a first resistor, a second resistor,
the first end of the first resistor is connected with the output end of the microstrip antenna, and the second end of the first resistor is connected with the first end of the second resistor and the base electrode of the first triode; a first end of the first resistor is used as an input end of the electromagnetic compatibility detection circuit;
the second end of the second resistor is connected with the output end of the power supply, the base of the third triode and the collector of the second triode;
the first resistor and the second resistor are used for dividing the base voltage of the first triode.
3. The EMC monitoring circuit of claim 1, further comprising a third resistor, a fourth resistor,
the first end of the third resistor is connected with the collector of the first triode and the first end of the fourth resistor, and the second end of the third resistor is connected with the base of the second triode;
a second end of the fourth resistor is grounded;
the third resistor and the fourth resistor are used for adjusting the sensitivity of the microstrip antenna by changing the resistance value.
4. The EMC monitoring circuit of claim 2, further comprising a fifth resistor, a sixth resistor,
a first end of the fifth resistor is connected with an output end of the power supply and a second end of the sixth resistor, and a second end of the fifth resistor is connected with a second end of the second resistor, a base of the third triode and a collector of the second triode;
the first end of the sixth resistor is connected with the collector of the first triode;
the fifth resistor is used for adjusting the voltage rise time of the base electrode of the first triode;
the sixth resistor is used for adjusting the voltage rise time of the base electrode of the second triode.
5. The EMC monitoring circuit of claim 2, further comprising a seventh resistor, an eighth resistor,
the seventh resistor is connected between the second resistor and the base of the third triode;
and the eighth resistor is connected between the collector of the third triode and the output end of the power supply.
6. The EMC monitoring circuit of claim 3, wherein the EMC detection circuit further comprises a first capacitor,
the first end of the first capacitor is connected with the second end of the fourth resistor, and the second end of the first capacitor is grounded;
the first capacitor is used for adjusting the voltage rising time of the base electrode of the second triode.
7. The EMC monitoring circuit of claim 1, wherein the complex programmable logic device includes an analog-to-digital converter,
the analog-digital converter is used for detecting the voltage of the collector of the third triode;
the electromagnetic compatibility monitoring circuit further comprises a baseboard management controller,
and the output end of the complex programmable logic device is connected with the substrate management controller through an I2C bus.
8. The emc monitoring circuit of claim 1, wherein the first transistor, the second transistor, and the third transistor are NPN transistors.
9. An emc monitoring method applied to an emc monitoring circuit according to any one of claims 2 to 8, the method comprising:
the complex programmable logic device monitors the voltage state of the output end of the electromagnetic compatibility detection circuit;
when the voltage state of the output end of the electromagnetic compatibility detection circuit changes repeatedly, the complex programmable logic device reports the alarm information that the electromagnetic compatibility monitoring exceeds the standard to a substrate management controller;
and the baseboard management controller inquires the register value of the complex programmable logic device in a polling mode, confirms the position of the alarm of which the electromagnetic compatibility monitoring exceeds the standard, and reports the position information of the alarm of which the electromagnetic compatibility monitoring exceeds the standard to an equipment operation and maintenance system.
10. An emc monitoring system, comprising an emc monitoring circuit according to any one of claims 1-8.
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| CN202210818796.6A CN115219821B (en) | 2022-07-12 | 2022-07-12 | Electromagnetic compatibility monitoring circuit, method and system |
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| CN202210818796.6A CN115219821B (en) | 2022-07-12 | 2022-07-12 | Electromagnetic compatibility monitoring circuit, method and system |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203084130U (en) * | 2012-12-24 | 2013-07-24 | 泉州豪杰信息科技发展有限公司 | Gps antenna state detection circuit |
| CN207851026U (en) * | 2018-01-31 | 2018-09-11 | 珠海市中科领航科技有限公司 | Systematic gas monitoring system |
| CN112000995A (en) * | 2020-08-06 | 2020-11-27 | 苏州浪潮智能科技有限公司 | Novel case intrusion warning system and method |
-
2022
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203084130U (en) * | 2012-12-24 | 2013-07-24 | 泉州豪杰信息科技发展有限公司 | Gps antenna state detection circuit |
| CN207851026U (en) * | 2018-01-31 | 2018-09-11 | 珠海市中科领航科技有限公司 | Systematic gas monitoring system |
| CN112000995A (en) * | 2020-08-06 | 2020-11-27 | 苏州浪潮智能科技有限公司 | Novel case intrusion warning system and method |
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