CN105226934A - A kind of processing method of electromagnetism harmonic radiation harassing and wrecking and device - Google Patents
A kind of processing method of electromagnetism harmonic radiation harassing and wrecking and device Download PDFInfo
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- CN105226934A CN105226934A CN201510679683.2A CN201510679683A CN105226934A CN 105226934 A CN105226934 A CN 105226934A CN 201510679683 A CN201510679683 A CN 201510679683A CN 105226934 A CN105226934 A CN 105226934A
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Abstract
The invention provides processing method and the device of a kind of electromagnetism harmonic radiation harassing and wrecking, comprising: the high order harmonic component produced in detected electrons equipment running process, and the resonance frequency that harmonic wave is popped one's head in is adjusted to order harmonic frequencies; Harmonics amplification generation alternating voltage is carried out to the harmonic wave that harmonic wave probe produces; Frequency discrimination is carried out to alternating voltage and exports the first direct voltage and the second direct voltage; Second direct voltage is produced the first binary voltage and the second binary voltage through voltage compare; The electronic switch controlled in harmonic filter by the first binary voltage and the second binary voltage carries out coarse tuning vibration frequency, carry out fine tuning vibration frequency by the capacity of variable capacitance diode in the first DC voltage control harmonic filter, make resonance frequency equal order harmonic frequencies.The present invention can reduce the harmonic radiation of electronic product, avoids electromagnetic radiation to the interference of peripheral equipment.
Description
Technical Field
The invention relates to the technical field of radiation disturbance, in particular to a method and a device for processing electromagnetic harmonic radiation disturbance.
Background
Radiation disturbance mainly refers to the phenomenon that energy is emitted to space from a source in the form of electromagnetic waves or energy is transmitted in space in the form of electromagnetic waves. In the working process of the electronic equipment, higher harmonics generated by various clock signals are emitted to the space from a source end in the form of electromagnetic waves to generate radiation disturbance, the performance of surrounding devices, equipment or systems is possibly reduced due to the fact that the radiation disturbance exceeds the standard, the normal work of information technology equipment or other electronic products is interfered, and certain harm is caused to human bodies. Thus, radiation disturbance is an important component of electromagnetic compatibility and is the item that tests are the least likely to pass and the most difficult to modify.
The main solutions at present include:
one mode is a shielding case, but the mode not only needs to use other methods or equipment to determine the interference source of the electromagnetic harmonic wave, but also adopts the shielding case under the condition that the interference source needs to be determined, so that the cost is high, the standardized processing technology and the assembly procedure are not facilitated, the complex later maintenance is difficult, and some high-magnetic harmonic waves cannot be completely shielded, and the electromagnetic leakage exists;
another approach is to use an RC circuit, as shown in fig. 1, which has the main disadvantages of reducing the level of the harmonic to a certain value and also reducing the level of the useful signal, and also has the electromagnetic leakage phenomenon even if the amplitude of the harmonic is reduced, and sometimes affects the signal integrity of the communication interface and the consistency of the product.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a method and an apparatus for processing electromagnetic harmonic radiation disturbance, which can reduce harmonic radiation of an electronic product and avoid interference of electromagnetic radiation on peripheral devices.
The invention provides a method for processing electromagnetic harmonic radiation disturbance, which comprises the following steps: the harmonic probe is used for detecting higher harmonics generated in the operation process of the electronic equipment and adjusting the resonant frequency of the harmonic probe to be higher harmonic frequency; the harmonic amplifier is used for carrying out harmonic amplification on the harmonic generated by the harmonic probe to generate alternating-current voltage; the frequency discriminator is used for carrying out frequency discrimination on the alternating voltage and outputting a first direct voltage and a second direct voltage; the voltage comparator is used for generating a first binary voltage and a second binary voltage by comparing the second direct-current voltage with the voltage; and the processor is used for controlling the electronic switch in the harmonic filter to perform coarse tuning on the vibration frequency through the first binary voltage and the second binary voltage, and controlling the capacity of the variable capacitance diode in the harmonic filter to perform fine tuning on the vibration frequency through the first direct-current voltage so that the resonance frequency is equal to the higher harmonic frequency.
Furthermore, the harmonic probe comprises a higher harmonic resonance circuit formed by a first inductor, a first capacitor, a second capacitor and a resistor.
Furthermore, the first inductor is an adjustable inductor, the second capacitor is an adjustable thin-mode capacitor, and the resonant frequency of the harmonic wave is adjusted by adjusting the first inductor and the second capacitor.
Furthermore, the first inductor is a fixed inductor, the first capacitor and the second capacitor are distributed capacitors, and the resonant frequency of the harmonic wave is adjusted by adjusting the first inductor, the first capacitor and the second capacitor.
Further, the voltage comparator compares the second direct current voltage with the first reference voltage and the second reference voltage to generate a first binary voltage and a second binary voltage.
Further, the processor includes a voltage actuations and indication driving, a/D conversion and data display module, wherein,
the voltage precision calculation and indication driving device is used for controlling an electronic switch in the harmonic filter to perform coarse tuning of the vibration frequency through the first binary voltage and the second binary voltage, and controlling the capacity of a variable capacitance diode in the harmonic filter to perform fine tuning of the vibration frequency through the first direct-current voltage so that the resonance frequency is equal to the higher harmonic frequency;
the data display module is used for displaying the voltage of the corresponding frequency point through A/D conversion, and if the voltage is 0, the measured position has no harmonic wave of the corresponding frequency point; if the voltage is not 0, harmonic disturbance exists at the measured position.
The invention also provides a method for processing electromagnetic harmonic radiation disturbance, which comprises the following steps: detecting higher harmonics generated in the operation process of the electronic equipment, and adjusting the resonant frequency of the harmonic probe to be higher harmonic frequency; carrying out harmonic amplification on the harmonic waves generated by the harmonic probe to generate alternating-current voltage; carrying out frequency discrimination on the alternating voltage to output a first direct voltage and a second direct voltage; comparing the second direct current voltage with the overvoltage to generate a first binary voltage and a second binary voltage; the electronic switch in the harmonic filter is controlled by the first binary voltage and the second binary voltage to perform coarse tuning of the vibration frequency, and the capacitance of the variable capacitance diode in the harmonic filter is controlled by the first direct current voltage to perform fine tuning of the vibration frequency, so that the resonance frequency is equal to the higher harmonic frequency.
Further, the method further comprises: displaying the voltage of the corresponding frequency point, wherein if the voltage is 0, the measured position has no harmonic wave of the corresponding frequency point; if the voltage is not 0, harmonic disturbance exists at the measured position.
Compared with the prior art, the invention has the beneficial effects that: by detecting the frequency point of the higher harmonic, the resonance frequency of the absorption loop can be accurately adjusted, the higher harmonic is filtered, and the interference source in electromagnetic radiation is controlled, so that the harmonic radiation of an electronic product is reduced, the requirement of the limit value of the radiation disturbance of the electronic product is met, and the interference of the electromagnetic radiation on peripheral equipment is avoided.
Drawings
Fig. 1 is a schematic diagram of an RC circuit in the prior art.
FIG. 2 is a schematic diagram of a circuit for processing electromagnetic harmonic radiation disturbance according to the present disclosure.
Fig. 3 is a schematic circuit diagram of the harmonic probe of fig. 2.
Fig. 4 is a circuit diagram of the voltage comparator in fig. 2.
Fig. 5 is a schematic diagram of the harmonic filter circuit of fig. 2.
Fig. 6 is a schematic flow chart of a processing method of electromagnetic harmonic radiation disturbance disclosed in the present invention.
Fig. 7 is a schematic structural diagram of a processing apparatus for electromagnetic harmonic radiation disturbance disclosed in the present invention.
Detailed Description
The present invention will be described in detail with reference to the specific embodiments shown in the drawings, which are not intended to limit the present invention, and structural, methodological, or functional changes made by those skilled in the art according to the specific embodiments are included in the scope of the present invention.
FIG. 2 is a schematic diagram of a circuit for processing electromagnetic harmonic radiation disturbance according to the present disclosure. Wherein,
chip 1 is the master chip and chip 2 is the slave chip in the communication system. During communication, the synchronous clock frequency of the chip 1 and the chip 2 is f. Since the clock system includes a Phase Locked Loop (PLL) or the like, which causes generation of higher harmonics, i.e., n multiples of a fundamental frequency signal, such as f 125MHZ, nf 500MHZ, 750MHZ, etc., the harmonics will become a source of interference.
The circuit diagram of the harmonic probe is shown in fig. 3, wherein a first inductor L1, a first capacitor C1, a second capacitor C2 and a resistor R form a higher harmonic resonant circuit, L1 is an adjustable inductor, C2 is an adjustable thin-mode capacitor, and the resonant frequency of harmonics can be adjusted by adjusting L1 and C1; l1 can also adopt fixed inductance, C2, C1 can also adopt distributed capacitance, improve resonance frequency point, satisfy the detection of higher harmonic. If the resonant frequency is F, the highest voltage U1 is generated in the resonant circuit when the harmonic of frequency F.
The signal generated by the harmonic probe is weak, the harmonic amplifier adopts high-frequency amplification with the gain of G to process the input small signal and output a harmonic signal U2.
The harmonic signal U2 generated by the harmonic amplifier is frequency discriminated to convert the frequency component into dc voltage components U3, U4.
The circuit schematic of the voltage comparator is shown in FIG. 4. U4 is compared with a first reference voltage Vref1 and a Vsecond reference voltage Vref2 to generate voltages U5 and U6.
Fig. 5 shows a schematic diagram of the harmonic filter circuit, where L2, C3, C4, C5, C6, VD, and K form the harmonic filter circuit, where K is an electronic switch; u5 and U6 control the state of a K internal switch, and the total resonant capacitance of the resonant circuit is controlled by the switch state to roughly adjust the resonant frequency; VD is a variable capacitance diode, and U3 controls the reverse voltage of VD to finely adjust the resonant frequency.
Based on the circuits shown in fig. 2 to 5, the method for processing electromagnetic harmonic radiation disturbance of the present invention is shown in fig. 6, and includes:
601, if the higher harmonic frequency generated by the operation of the electronic equipment is Kf, the higher harmonic will be radiated outwards through the space, the harmonic probe detects the higher harmonic, and the resonant frequency of the harmonic probe is adjusted to be Kf;
step 602, harmonic waves with resonant frequency Kf are subjected to harmonic amplification to generate an alternating voltage U2;
step 603, performing frequency discrimination on the alternating current voltage U2 to output direct current voltages U3 and U4;
step 604, generating binary voltages U5 and U6 by the direct current voltage U4 through an overvoltage comparator, wherein the binary voltages U5 and U6 control an electronic switch in a harmonic filter to connect C4/C5 into a circuit to perform coarse tuning on the resonant frequency;
in step 605, the dc voltage U3 controls the capacitance of the varactor inside the harmonic filter to perform fine tuning of the resonant frequency, so that the resonant frequency is equal to Kf.
Therefore, the harmonic waves are short-circuited by the series resonant circuit, so that higher harmonic waves are filtered out or the radiation energy of the higher harmonic waves is reduced to meet the electromagnetic compatibility requirement of products.
The invention also provides a processing device for electromagnetic harmonic radiation disturbance, as shown in figure 7,
the harmonic probe is used for detecting higher harmonics generated in the operation process of the electronic equipment and adjusting the resonant frequency according to the higher harmonic frequency;
the harmonic amplifier is used for carrying out harmonic amplification on the harmonic generated by the harmonic probe to generate an alternating current voltage U2;
the frequency discriminator is used for discriminating the alternating voltage U2 and outputting a first direct voltage U3 and a second direct voltage U4;
the voltage comparator is used for comparing the second direct current voltage U4 to generate a first binary voltage U5 and a second binary voltage U6;
a processor including a voltage actuations and indication driving, A/D conversion and data display module, wherein,
the voltage precision calculation and indication driving is used for controlling an electronic switch in the harmonic filter through binary voltages U5 and U6 to connect C4/C5 into a circuit to perform coarse tuning of the oscillation frequency; the capacity of a varactor inside the harmonic filter is controlled by a first direct-current voltage U3 to perform fine tuning on the resonant frequency, so that the resonant frequency is equal to the higher harmonic frequency;
the data display module is used for displaying the voltage of the corresponding frequency point through A/D conversion, and if the voltage is 0, the measured position has no harmonic wave of the corresponding frequency point; if the voltage is not 0, then there is harmonic disturbance.
Although the present invention has been described with reference to the preferred embodiments, it is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims. It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (8)
1. A device for processing electromagnetic harmonic radiation disturbance, comprising:
the harmonic probe is used for detecting higher harmonics generated in the operation process of the electronic equipment and adjusting the resonant frequency of the harmonic probe to be higher harmonic frequency;
the harmonic amplifier is used for carrying out harmonic amplification on the harmonic generated by the harmonic probe to generate alternating-current voltage;
the frequency discriminator is used for carrying out frequency discrimination on the alternating voltage and outputting a first direct voltage and a second direct voltage;
the voltage comparator is used for generating a first binary voltage and a second binary voltage by comparing the second direct-current voltage with the voltage;
and the processor is used for controlling the electronic switch in the harmonic filter to perform coarse tuning on the vibration frequency through the first binary voltage and the second binary voltage, and controlling the capacity of the variable capacitance diode in the harmonic filter to perform fine tuning on the vibration frequency through the first direct-current voltage so that the resonance frequency is equal to the higher harmonic frequency.
2. The apparatus for processing electromagnetic harmonic radiation disturbance according to claim 1, wherein the harmonic probe comprises a higher harmonic resonance circuit formed by a first inductor, a first capacitor, a second capacitor and a resistor.
3. The apparatus for processing electromagnetic harmonic radiation disturbance of claim 2, wherein the first inductor is an adjustable inductor and the second capacitor is an adjustable thin-mode capacitor, and wherein the resonant frequency of the harmonic is adjusted by adjusting the first inductor and the second capacitor.
4. The apparatus for processing electromagnetic harmonic radiation disturbance of claim 2, wherein the first inductor is a fixed inductor, the first capacitor and the second capacitor are distributed capacitors, and the resonant frequency of the harmonic is adjusted by adjusting the first inductor, the first capacitor and the second capacitor.
5. The apparatus for processing electromagnetic harmonic radiation disturbance of claim 1, wherein the voltage comparator compares the second dc voltage to a first reference voltage and a second reference voltage to generate a first binary voltage and a second binary voltage.
6. The apparatus for processing electromagnetic harmonic radiation disturbance of claim 1, wherein the processor includes a voltage calculation and indication drive, A/D conversion and data display module, wherein,
the voltage precision calculation and indication driving device is used for controlling an electronic switch in the harmonic filter to perform coarse tuning of the vibration frequency through the first binary voltage and the second binary voltage, and controlling the capacity of a variable capacitance diode in the harmonic filter to perform fine tuning of the vibration frequency through the first direct-current voltage so that the resonance frequency is equal to the higher harmonic frequency;
the data display module is used for displaying the voltage of the corresponding frequency point through A/D conversion, and if the voltage is 0, the measured position has no harmonic wave of the corresponding frequency point; if the voltage is not 0, harmonic disturbance exists at the measured position.
7. A method for processing electromagnetic harmonic radiation disturbance is characterized by comprising the following steps:
detecting higher harmonics generated in the operation process of the electronic equipment, and adjusting the resonant frequency of the harmonic probe to be higher harmonic frequency;
carrying out harmonic amplification on the harmonic waves generated by the harmonic probe to generate alternating-current voltage;
carrying out frequency discrimination on the alternating voltage to output a first direct voltage and a second direct voltage;
comparing the second direct current voltage with the overvoltage to generate a first binary voltage and a second binary voltage;
the electronic switch in the harmonic filter is controlled by the first binary voltage and the second binary voltage to perform coarse tuning of the vibration frequency, and the capacitance of the variable capacitance diode in the harmonic filter is controlled by the first direct current voltage to perform fine tuning of the vibration frequency, so that the resonance frequency is equal to the higher harmonic frequency.
8. The method for processing electromagnetic harmonic radiation disturbance according to claim 7, further comprising: displaying the voltage of the corresponding frequency point, wherein if the voltage is 0, the measured position has no harmonic wave of the corresponding frequency point; if the voltage is not 0, harmonic disturbance exists at the measured position.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116223905A (en) * | 2022-12-14 | 2023-06-06 | 广州汇电云联互联网科技有限公司 | Harmonic frequency detection system, method, device and storage medium |
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| CN103152003A (en) * | 2013-01-18 | 2013-06-12 | 西安电子科技大学 | Ultra-wide band electrically-tunable band-pass filter set and frequency control method thereof |
| CN104270002A (en) * | 2014-10-25 | 2015-01-07 | 哈尔滨理工大学 | Passive suppression method for conducted electromagnetic interface of PWM (power width modulation) power converter |
| WO2015140421A1 (en) * | 2014-03-05 | 2015-09-24 | Whylot Sas | Device and method for filtering the resonance peak in a circuit for supplying at least one loud speaker upstream of the latter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103152003A (en) * | 2013-01-18 | 2013-06-12 | 西安电子科技大学 | Ultra-wide band electrically-tunable band-pass filter set and frequency control method thereof |
| WO2015140421A1 (en) * | 2014-03-05 | 2015-09-24 | Whylot Sas | Device and method for filtering the resonance peak in a circuit for supplying at least one loud speaker upstream of the latter |
| CN104270002A (en) * | 2014-10-25 | 2015-01-07 | 哈尔滨理工大学 | Passive suppression method for conducted electromagnetic interface of PWM (power width modulation) power converter |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116223905A (en) * | 2022-12-14 | 2023-06-06 | 广州汇电云联互联网科技有限公司 | Harmonic frequency detection system, method, device and storage medium |
| CN116223905B (en) * | 2022-12-14 | 2023-12-08 | 广州市均能科技有限公司 | Harmonic frequency detection system, method, device and storage medium |
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