CN108267647B - Detection method and device for power conduction electromagnetic leakage protection - Google Patents
Detection method and device for power conduction electromagnetic leakage protection Download PDFInfo
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- CN108267647B CN108267647B CN201711372878.8A CN201711372878A CN108267647B CN 108267647 B CN108267647 B CN 108267647B CN 201711372878 A CN201711372878 A CN 201711372878A CN 108267647 B CN108267647 B CN 108267647B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0807—Measuring electromagnetic field characteristics characterised by the application
- G01R29/0814—Field measurements related to measuring influence on or from apparatus, components or humans, e.g. in ESD, EMI, EMC, EMP testing, measuring radiation leakage; detecting presence of micro- or radiowave emitters; dosimetry; testing shielding; measurements related to lightning
- G01R29/0835—Testing shielding, e.g. for efficiency
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0864—Measuring electromagnetic field characteristics characterised by constructional or functional features
- G01R29/0892—Details related to signal analysis or treatment; presenting results, e.g. displays; measuring specific signal features other than field strength, e.g. polarisation, field modes, phase, envelope, maximum value
Abstract
The invention discloses a detection method for power conduction electromagnetic leakage protection, which comprises the following steps: generating an electromagnetic leakage red signal for simulating a conduction electromagnetic leakage signal by using a conduction electromagnetic leakage red signal source, and coupling the electromagnetic leakage red signal to a signal source power line; the leakage signal detection device receives and analyzes the signal of the receiving end. The invention also discloses a detection device for power conduction electromagnetic leakage protection, which comprises: the transmission electromagnetic leakage red signal source is used for generating an electromagnetic leakage red signal simulating the transmission electromagnetic leakage signal and realizing the coupling of the electromagnetic leakage red signal to a signal source power line; and the leakage signal detection device is used for receiving and analyzing the signals at the receiving end. The invention realizes the rapid detection and weak point location of the device and system conductive electromagnetic leakage protection capability.
Description
Technical Field
The invention relates to the technical field of electromagnetic environment safety protection, in particular to a detection method and a detection device for power conduction electromagnetic leakage protection.
Background
During the operation of the digital system, the information of the behavior, storage and processing of the system can be transmitted by two Electromagnetic leakage modes, namely radiation leakage and conduction leakage, and the leaked Electromagnetic signals can be restored at the far end of the leakage source by using TEMPEST (transient Electromagnetic Pulse emission technology). The conducted information leakage is a main electromagnetic leakage mode, and the threat of electromagnetic information leakage caused by strong signal intensity and long transmission distance is larger. Aiming at the leakage of the conduction information, the existing protection method is to connect a red and black isolation device in series on a conduction line for filtering to realize isolation.
The red and black isolation device is generally composed of passive L, R, C and other devices, and different filter topologies are adopted for the device, so that different frequency responses are brought, namely the insertion loss of the red and black isolation device. The insertion loss of a red and black spacer is typically measured under 50 ohm loading and is given a nominal value. In fact, the performance of the red and black isolation device is affected by the filtering topology of the red and black isolation device, and is also affected by the load characteristics in the practical application environment and the grounding condition of the red and black isolation device. In an actual application scenario, the same red and black isolation device has completely different load characteristics due to different hardware conditions of the accessed target device and the system, and the expressed red and black isolation effects are completely different, so that the red and black isolation performance is most likely to deviate from a nominal value under the premise of 50 ohms, and an ideal conductive electromagnetic information leakage protection effect cannot be achieved in certain frequency bands.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the conductive electromagnetic leakage protection effect of the red and black isolation device in the practical application environment, a quick and effective field detection method and device are provided, the real red and black isolation effect of the equipment and the system is subjected to field inspection, and a basis is provided for the weak link investigation of the conductive electromagnetic leakage of the equipment and the system and the improvement of the whole conductive electromagnetic protection capability.
The invention provides a detection method for power conduction electromagnetic leakage protection, which comprises the following steps:
generating an electromagnetic leakage red signal for simulating a conduction electromagnetic leakage signal by using a conduction electromagnetic leakage red signal source, and coupling the electromagnetic leakage red signal to a signal source power line;
the leakage signal detection device receives and analyzes the signal of the receiving end.
Further, the conducted electromagnetic leakage red signal source modulates the electromagnetic leakage red signal through a carrier signal; the leakage signal detection device at the receiving end is a radio or other portable frequency spectrum receiving device.
Further, the frequency of the carrier signal is 150 kHz-30 MHz.
Furthermore, the conduction electromagnetic leakage red signal source utilizes a power supply interface of the signal source to carry out power supply coupling, the power supply interface of the conduction electromagnetic leakage red signal source is a USB interface, and the interface does not contain a signal line.
Further, the conductive electromagnetic leakage red signal source can be connected with other interfaces or an external AC-DC or DC-DC power adapter in a switching mode.
Furthermore, the electromagnetic leakage red signal is amplified by a power amplifier and then coupled.
The invention also provides a detection device for power conduction electromagnetic leakage protection, which comprises:
the transmission electromagnetic leakage red signal source is used for generating an electromagnetic leakage red signal simulating the transmission electromagnetic leakage signal and realizing the coupling of the electromagnetic leakage red signal to a signal source power line;
and the leakage signal detection device is used for receiving and analyzing the signals at the receiving end.
Further, the conducted electromagnetic leakage red signal source modulates the electromagnetic leakage red signal through a carrier signal; the leakage signal detection device at the receiving end is a radio or other portable frequency spectrum receiving device.
Further, the frequency of the carrier signal is 150 kHz-30 MHz.
Furthermore, the conduction electromagnetic leakage red signal source utilizes a power supply interface of the signal source to carry out power supply coupling, the power supply interface of the conduction electromagnetic leakage red signal source is a USB interface, and the interface does not contain a signal line.
Further, the conductive electromagnetic leakage red signal source can be connected with other interfaces or an external AC-DC or DC-DC power adapter in a switching mode.
Furthermore, the electromagnetic leakage red signal is amplified by a power amplifier and then coupled.
The invention also provides a conductive electromagnetic leakage red signal source, which is used for generating an electromagnetic leakage red signal and realizing the coupling of the electromagnetic leakage red signal to a signal source power line.
Further, the signal generating device comprises a microcontroller MCU, and the MCU modulates and outputs the electromagnetic leakage red signal through a carrier signal.
Further, the frequency of the carrier signal is 150 kHz-30 MHz.
Furthermore, the output signal of the MCU is amplified by the power amplifier and then coupled by the conduction coupling device.
Furthermore, the power supply interface of the conduction electromagnetic leakage red signal source is a USB interface, and the interface does not contain a signal line.
Further, the conductive electromagnetic leakage red signal source can be connected with other interfaces or comprises a power conversion device, and the power conversion device comprises an AC-DC or DC-DC power adapter.
By adopting the technical scheme, the invention has the beneficial effects that: the invention realizes the rapid detection and weak point location of the device and system conductive electromagnetic leakage protection capability. The device is low in implementation cost, and the device and the detection method can be effectively applied to field detection of the electromagnetic protection capability of equipment and systems, provide an effective means for evaluation of the conductive electromagnetic leakage protection capability of important equipment and systems, and provide support for improvement of the protection capability of the equipment and systems.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a test chart of the leakage protection capability of a single device for conducting electromagnetic information;
FIG. 2 is a diagram of a system power supply network conducted electromagnetic information leakage protection capability test;
FIG. 3 is a schematic diagram of a protection capability test;
FIG. 4 is a block diagram of the conductive electromagnetic leakage red signal source hardware components;
FIG. 5 is a diagram of signal modulation patterns;
FIG. 6 is a frame format diagram of a complex conducted electromagnetic leakage information;
fig. 7 is a flowchart of electromagnetic leakage red signal generation.
The labels in the figure are:
1 is an equipment grounding device; 2 is a device shielding cavity; 3, a direct current power supply network inside the equipment; 4, an equipment internal board card; 5 is a conduction electromagnetic leakage red signal source; 6 is the equipment power supply and the filter device; 7 is a signal line test probe; 8 is a power line test probe; 9 is a portable leakage signal detection device; 10 is a tested electronic system; 11 is a system power supply network red and black isolation device; 12 is the electronic equipment inside the system; 13 is an alternating current supply network in the system; 14 is a red signal source direct current power supply line; 15 is data for which no leakage program is running; 16 is the sync mark for leak start; 17 is the leak program check bit; 18 is data conducting leakage of electromagnetic information; 19 is a conductive electromagnetic leakage end flag; and 20 is data after the leakage program exits.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In one embodiment, a single device red-black signal isolation capability test environment using a conductive electromagnetic leakage red signal source is shown in FIG. 1. The power supply cable and the communication cable of the equipment are main paths for conducting electromagnetic information leakage, and the electromagnetic leakage red signal is actively excited in the equipment, and the power supply cable and the communication cable outside the equipment are subjected to signal receiving test, so that the test of the true protection capability of single equipment for conducting electromagnetic information leakage can be realized. Similarly, a conducted electromagnetic information leakage protection test for an electrical power supply network of an electronic information system is shown in fig. 2.
Whether in a single device or a system, the isolation effect of the conductive electromagnetic leakage red-black isolation device can be equivalent to a two-port network, and as shown in fig. 3, the S21 parameter of the two-port network can represent the performance of the red-black isolation device. When an electromagnetic leakage red signal Vi of a certain frequency point passes through the red and black isolating device, the amplitude is attenuated to become an output signal Vo, and then the equivalent insertion loss of the red and black isolating device at the frequency point is as follows:
the full-band test of the conduction electromagnetic leakage protection capability can be realized by traversing the frequency range to be tested by the conduction electromagnetic leakage red signal source.
In one embodiment, the detection method for power conduction electromagnetic leakage protection of the invention utilizes a conduction electromagnetic leakage red signal source to generate an electromagnetic leakage red signal for simulating a conduction electromagnetic leakage signal, and couples the electromagnetic leakage red signal to a signal source power line; the leakage signal detection device receives and analyzes the signal of the receiving end.
In one embodiment, the detection device for power conduction electromagnetic leakage protection of the invention comprises a conduction electromagnetic leakage red signal source and a leakage signal detection device.
1. Conduction electromagnetic leakage red signal source
The conduction electromagnetic leakage red signal source is a key device of the detection method and the detection device for power conduction electromagnetic leakage protection. The conductive electromagnetic leakage red signal source mainly completes the generation of electromagnetic leakage red signals and realizes the coupling of the red signals to a power line of the signal source. The hardware composition of the conducted electromagnetic leakage red signal source is shown in fig. 4.
Frequency input means:
because the electromagnetic conduction leakage red signal source needs to simulate the electromagnetic conduction leakage signal in the full frequency band of 150 kHz-30 MHz, the frequency input device can input the signal frequency point needing to be leaked to the I/O or A/D conversion port corresponding to the MCU (microcontroller) by a matrix keyboard, an encoder or analog quantity input mode and the like. The portable leakage signal detection device is mainly used for providing a man-machine interface for the MCU, receiving frequency information of a signal set manually, and providing received/demodulated frequency information for the portable leakage signal detection device.
A signal generation device:
the signal generating device is independently completed by the MCU and is a core part for conducting the electromagnetic leakage red signal source. The analog electromagnetic leakage red signal is generated by an I/O port of the MCU and a length of cable. In order to ensure that the high frequency of the output signal can reach 30MHz, the MCU selects a higher reference frequency as much as possible during model selection, and the frequency and the quality of the output signal are ensured.
The output format of the signal generating device is shown in fig. 5. After receiving the frequency input signal, the MCU outputs a carrier signal with a period T1, and the frequency is also a frequency point that the receiving device needs to demodulate. The signal uses AM modulation to take the signal T2 (which may be audio, text or other information) to be leaked as the envelope of the carrier signal. After AM modulation, the receiving device can effectively demodulate T2 information at the frequency point corresponding to T1 and its harmonic point. Further, on the necessary premise, the T2 signal is further encoded and designed, so that more complex modulation of the content of the conducted electromagnetic leakage can be realized, as shown in fig. 6, after simple verification analysis, a signal "01100001011000100011000100110010" can be obtained, and after corresponding ASCII code, the conducted electromagnetic leakage signal "ab 12" can be analyzed.
Because the signal generating device is mainly born by the MCU. The flow chart of the MCU completing the modulation and output of the electromagnetic leakage red signal is shown in FIG. 7. After the initialization is successful, configuring leakage frequency points and a modulation mode; reading leakage information; processing the leakage information and sending the leakage information to a corresponding port; if fifo is abnormal, returning to the previous step; if fifo is normal, sending specific data to generate specific electromagnetic signals; if the transmission needs to be continued, the steps are circulated; if the transmission is aborted, the process ends.
A conductive coupling device:
when the MCU completes the output of a specific modulation signal, the inversion of each bit of an I/O port of the signal output of the MCU can couple corresponding conduction electromagnetic leakage signals on a power supply (+5V) and a ground line (GND). The MCU can realize the coupling of the electromagnetic leakage red signal source to the power line while outputting the signal.
The essence of the conductive coupling means is the coupling of the electric dipole antenna output signal to the power source. In order to further enhance the coupling degree of the power supply signal, energy storage devices such as inductors, magnetic beads and capacitors should be adopted as few as possible in a hardware system for conducting the electromagnetic leakage red signal source. If necessary, the length and the sectional area of a cable of the MCU modulation signal output port can be increased to improve the transmitting power and the coupling power, or a single I/O output is adjusted to be a multi-I/O parallel output, even a voltage/power amplifier is added, the output signal of the MCU is amplified for the second time, and the potential of the output level is improved, so that the power conduction coupling energy of the MCU is increased.
The power conversion device comprises:
the power conversion device is mainly completed by an AC-DC or DC-DC power adapter, and the main purpose is to enable a conduction electromagnetic leakage red signal source to have stronger power adaptability and realize the coupling of the electromagnetic leakage red signal from low-voltage direct current to high-voltage direct current or even an alternating current power network.
The core component of the power conversion device is a transformer, and the ideal transformer has good common-mode signal rejection capability. In the design process of an actual transformer or a switching power supply, a coupling capacitor Cww is directly or indirectly parasitic between the primary coil and the secondary coil of the transformer, so that the electromagnetic leakage red signal can be efficiently coupled to direct current or alternating current at the front end of the power supply through a power adapter. The power conversion device realizes the transmission of the electromagnetic leakage red signal while realizing the power conversion function of the conduction electromagnetic leakage red signal source.
In another embodiment, the conductive electromagnetic leakage red signal source is coupled with a power supply interface of the signal source, the power supply interface of the conductive electromagnetic leakage red signal source is a USB interface, and the interface does not include a signal line. In another embodiment, a source of conductive electromagnetic leakage red signals may switch to other interfaces.
2. Leakage signal detection device
In the power conduction electromagnetic leakage protection method, an electromagnetic leakage red signal source is matched with a certain receiving device to evaluate the electromagnetic conduction leakage protection capability of target equipment or a system.
The leakage red signal has been coupled into the power supply network of the target device or system by a conductive electromagnetic leakage red signal source, and the modulation scheme is AM modulation. The leakage signal detection device at the receiving end can adopt a radio or other portable frequency spectrum receiving devices to receive and analyze signals. By analyzing the signal intensity of the receiving end, the protection capability of the target equipment or system can be effectively evaluated.
While the foregoing description shows and describes the preferred embodiments of the present invention, it is to be understood, as noted above, that the invention is not limited to the forms disclosed herein, but is not intended to be exhaustive or to exclude other embodiments and may be used in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept described herein, as determined by the above teachings or as determined by the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (13)
1. A method for detecting power conduction electromagnetic leakage protection, comprising:
generating an electromagnetic leakage red signal for simulating a conduction electromagnetic leakage signal by using a conduction electromagnetic leakage red signal source, and coupling the electromagnetic leakage red signal to a signal source power line; the conduction electromagnetic leakage red signal source comprises a frequency input device, a signal generation device and a conduction coupling device, wherein the frequency input device is used for inputting frequency to the signal generation device, and the conduction coupling device is used for coupling an output signal of the signal generation device to a signal source power line; the signal generating device comprises a microcontroller MCU (microprogrammed control unit), and the MCU modulates and outputs the electromagnetic leakage red signal through a carrier signal; the simulated electromagnetic leakage red signal is generated by an I/O port of the MCU and a cable with a certain length; the power supply interface of the conduction electromagnetic leakage red signal source is a USB interface, and the interface does not contain a signal line; the conduction electromagnetic leakage red signal source also comprises a power supply conversion device, and the power supply conversion device comprises a transformer; the conduction electromagnetic leakage red signal source can be connected with other interfaces or an external AC-DC or DC-DC power adapter in a switching mode;
the leakage signal detection device receives and analyzes the signal of the receiving end;
the isolation effect of the conductive electromagnetic leakage red-black isolation device is equivalent to a two-port network, and the S21 parameter of the two-port network represents the performance of the red-black isolation device; when an electromagnetic leakage red signal Vi of a certain frequency point passes through the red and black isolating device, the amplitude is attenuated to become an output signal Vo, and then the equivalent insertion loss of the red and black isolating device at the frequency point is as follows:
the full-band test of the conduction electromagnetic leakage protection capability can be realized by traversing the frequency range to be tested by the conduction electromagnetic leakage red signal source.
2. The method of claim 1, wherein the conducted electromagnetic leakage red signal source modulates the electromagnetic leakage red signal with a carrier signal.
3. The method as claimed in claim 2, wherein the leakage signal detection device at the receiving end is a radio or other portable spectrum receiving device.
4. The method of claim 2, wherein the carrier signal has a frequency of 150kHz to 30 MHz.
5. The method of claim 1, wherein the electromagnetic leakage red signal is amplified by a power amplifier and then coupled.
6. A power conduction electromagnetic leakage protection detection device, comprising:
the transmission electromagnetic leakage red signal source is used for generating an electromagnetic leakage red signal simulating the transmission electromagnetic leakage signal and realizing the coupling of the electromagnetic leakage red signal to a signal source power line; the conduction electromagnetic leakage red signal source comprises a frequency input device, a signal generation device and a conduction coupling device, wherein the frequency input device is used for inputting frequency to the signal generation device, and the conduction coupling device is used for coupling an output signal of the signal generation device to a signal source power line; the signal generating device comprises a microcontroller MCU (microprogrammed control unit), and the MCU modulates and outputs the electromagnetic leakage red signal through a carrier signal; the simulated electromagnetic leakage red signal is generated by an I/O port of the MCU and a cable with a certain length; the power supply interface of the conduction electromagnetic leakage red signal source is a USB interface, and the interface does not contain a signal line; the conduction electromagnetic leakage red signal source also comprises a power supply conversion device, and the power supply conversion device comprises a transformer; the conduction electromagnetic leakage red signal source can be connected with other interfaces or an external AC-DC or DC-DC power adapter in a switching mode;
the leakage signal detection device is used for receiving and analyzing signals at a receiving end;
the isolation effect of the conductive electromagnetic leakage red-black isolation device is equivalent to a two-port network, and the S21 parameter of the two-port network represents the performance of the red-black isolation device; when an electromagnetic leakage red signal Vi of a certain frequency point passes through the red and black isolating device, the amplitude is attenuated to become an output signal Vo, and then the equivalent insertion loss of the red and black isolating device at the frequency point is as follows:
the full-band test of the conduction electromagnetic leakage protection capability can be realized by traversing the frequency range to be tested by the conduction electromagnetic leakage red signal source.
7. The device of claim 6, wherein the conductive electromagnetic leakage red signal source modulates the electromagnetic leakage red signal with a carrier signal.
8. The apparatus of claim 7, wherein the leakage signal detection device at the receiving end is a radio or other portable spectrum receiving device.
9. The device of claim 7, wherein the carrier signal has a frequency of 150kHz to 30 MHz.
10. The device of claim 6, wherein the electromagnetic leakage red signal is amplified by a power amplifier and then coupled.
11. A conduction electromagnetic leakage red signal source is characterized in that the conduction electromagnetic leakage red signal source is used for generating an electromagnetic leakage red signal and realizing the coupling of the electromagnetic leakage red signal to a signal source power line, and comprises a frequency input device, a signal generating device and a conduction coupling device, wherein the frequency input device is used for inputting frequency to the signal generating device, and the conduction coupling device is used for coupling an output signal of the signal generating device to the signal source power line;
the signal generating device comprises a microcontroller MCU (microprogrammed control unit), and the MCU modulates and outputs the electromagnetic leakage red signal through a carrier signal; the simulated electromagnetic leakage red signal is generated by an I/O port of the MCU and a cable with a certain length; the power supply interface of the conduction electromagnetic leakage red signal source is a USB interface, and the interface does not contain a signal line;
the conduction electromagnetic leakage red signal source also comprises a power supply conversion device, and the power supply conversion device comprises a transformer;
the conduction electromagnetic leakage red signal source can be connected with other interfaces in a switching mode or the power conversion device comprises an AC-DC or DC-DC power adapter;
the isolation effect of the conductive electromagnetic leakage red-black isolation device is equivalent to a two-port network, and the S21 parameter of the two-port network represents the performance of the red-black isolation device; when an electromagnetic leakage red signal Vi of a certain frequency point passes through the red and black isolating device, the amplitude is attenuated to become an output signal Vo, and then the equivalent insertion loss of the red and black isolating device at the frequency point is as follows:
the full-band test of the conduction electromagnetic leakage protection capability can be realized by traversing the frequency range to be tested by the conduction electromagnetic leakage red signal source.
12. A conductive electromagnetic leakage red signal source according to claim 11, wherein said carrier signal has a frequency of 150kHz to 30 MHz.
13. The conducted electromagnetic leakage red signal source of claim 11, wherein the output signal of the MCU is amplified by the power amplifier and then coupled by the conductive coupling device.
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| CN109239467B (en) * | 2018-07-24 | 2021-02-05 | 中国空间技术研究院 | Multi-position and wide-frequency-band-oriented satellite deck electromagnetic leakage detection device and method |
| CN110907706A (en) * | 2018-09-18 | 2020-03-24 | 比亚迪股份有限公司 | Electromagnetic radiation testing method and device |
| CN110688652A (en) * | 2019-08-30 | 2020-01-14 | 中国电子科技网络信息安全有限公司 | USB micro electromagnetic leakage signal source |
| CN111949988B (en) * | 2020-07-03 | 2022-04-22 | 中国电子科技网络信息安全有限公司 | Active electromagnetic vulnerability detection system and method for physically isolated computer |
| CN112630683A (en) * | 2020-12-10 | 2021-04-09 | 山东恒邦智能设备有限公司 | Checking and repairing point system for local electric leakage of high-voltage switch cabinet |
| CN112763810A (en) * | 2020-12-28 | 2021-05-07 | 河北科技师范学院 | Electromagnetic leakage detection device for computer digital video information |
| CN113156221A (en) * | 2021-03-26 | 2021-07-23 | 上海上大鼎正软件股份有限公司 | Monitoring device and monitoring system based on electromagnetic leakage |
| CN116047177B (en) * | 2023-03-31 | 2023-06-02 | 中国船舶集团有限公司第七〇七研究所 | Electromagnetic leakage testing method and device for fiber optic gyroscope |
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