"How to choose the magnetic ring", "How to choose the magnetic ring" I usually first understand the use of the customer's magnetic ring, the frequency of use and so on.
Here I simply analyze, such as: when encountering interference, generally use amorphous magnetic ring, manganese-zinc magnetic ring or nickel-zinc magnetic ring, of course, these three magnetic rings use different frequency segments. When high-frequency interference is used, the nickel-zinc magnetic ring is selected. How big the magnetic ring is used for the large wire, the inner hole must be paid attention to, the wire thickness and the inner hole of the magnetic ring must be just right, too big to wear, too small to leak magnetic, still There are injection molds that are slightly larger than the magnetic ring size, but do not make the gap too large, so it is not easy to damage the mold during injection molding. In addition, when the performance is not strong, the wire diameter is so large, then the outer diameter and the inner hole are unchanged, but the length is selected to be a longer magnetic ring. Generally, the selection of the magnetic ring is preferred to "the outer diameter is large, the inner hole is small, and the length is long". The larger the cross-sectional area of ​​the magnetic ring, the better the effect.
How to choose the magnetic ring?Now let me introduce how the clip-on magnetic ring is selected. The clip-on magnetic ring is relatively better than other magnetic ring models. It is convenient and quick to use. It is made up of two-piece magnetic core and plastic shell. Assembled, it is also called assembly magnetic ring. With this type of model, it can be directly attached to the interference line without injection molding. In the case of a large inner diameter, it can be repeatedly wound 1~2 times. The more the winding, the better the impedance effect. At present, our specifications have been suitable for 1MM to 19MM cable clip type magnetic ring for customers to choose.
1.1 Electromagnetic environment electromagneTIc environment
The sum of all electromagnetic phenomena present at a given location.
1.2 electromagnetic noise electromagneTIc noise
A time-varying electromagnetic phenomenon that clearly does not transmit information, which may be superimposed or combined with useful signals.
1.3 unwanted signal unwanted signal, undesired signal
Signals that may be corrupted by the useful signal.
1.4 Interference signal
Damage to signals received by useful signals.
1.5 electromagnetic disturbance electromagneTIc disturbance
Any electromagnetic phenomenon that may degrade the performance of the device, equipment, or system or cause damage to living or inanimate matter.
Note: Electromagnetic disturbances may be electromagnetic noise, unwanted signals or changes in the media itself.
1.6 electromagnetic interference electromagneTIc interference (EMI)
A decrease in the performance of equipment, transmission channels, or systems caused by electromagnetic disturbances.
1.7 Electromagnetic compatibility (EMC)
A device or system that functions properly in its electromagnetic environment and does not constitute an unacceptable electromagnetic disturbance to anything in the environment.
1.8 (electromagnetic) emission (electromagnet1c) em1ss1on
The phenomenon of electromagnetic energy emitted from the source.
1.9 (in radio communication) emission (in radiocommunication)
A phenomenon in which a radio wave or signal is generated and emitted by a radio transmitter.
1.10 (electromagnetic) radiation
a. The phenomenon in which energy is emitted from the source into space in the form of electromagnetic waves.
b. Energy travels in space as electromagnetic waves.
Note: The meaning of the term “electromagnetic radiation†can sometimes be extended to include electromagnetic induction.
1.11 radio environment
National Technical Supervision Bureau 19 9 5- 0 8- 2 5 Approval 19 9 6- 0 3- 01 Implementation
a. Electromagnetic environment within the radio frequency range.
b. The sum of the electromagnetic fields generated by all working radio transmitters in a given location.
1.12 radio (frequency) noise radio (frequency) noise
Electromagnetic noise with radio frequency components.
1.13 radio (frequency) disturbance radio (frequency) disturbance
Electromagnetic disturbance with radio frequency components.
1.14 radio frequency interference (RFI)
A decrease in the useful signal reception performance caused by radio disturbances.
1.15 inter-system interference
Electromagnetic interference caused by electromagnetic disturbances generated by other systems to a system.
1.16 intra-system interference
Electromagnetic interference caused by electromagnetic disturbances inside the system appearing in the system.
1.17 natural noise
Electromagnetic noise generated by natural phenomena rather than by artificial devices.
1.18 man-made noise
Electromagnetic noise from artificial devices.
1.19 (performance) degradation (of performance)
Undesirable deviations in performance between a device, device, or system from normal performance.
1.20 (for harassment) immunity (to a disturbance)
The ability of a device, device, or system to experience electromagnetic disturbances without degrading operational performance.
1.21 (electromagnetic) sensitivity (electromagnetic) susceptibility
In the presence of electromagnetic disturbances, the device, device or system cannot avoid the ability to degrade performance. Note: High sensitivity and low immunity.
2 disturbance waveform
2.1 transient (adjective and noun)
A physical quantity or physical phenomenon that changes between two adjacent stable states whose change time is less than the time scale of interest.
2.2 Pulse Pulse
A physical quantity that mutates in a short period of time and then quickly returns to its initial value.
2.3 impulse impulse impulse
A pulse that approximates a unit pulse or a Dirac function for a given application.
2.4 spike pulse
A one-way pulse with a short duration.
2. 5 (pulse) rise time rise time (of a pluse)
The time it takes for the pulse instantaneous value to first rise from a given lower limit to a given upper limit.
Note: Unless otherwise specified, the lower and upper limits are set at 10% and 90% of the pulse amplitude, respectively.
2.6 rate of rise rate of rise
An average rate over time in a specified range of values, from 10% to 90% of the peak.
2.7 burst (pulse or oscillation) burst (of pluses or oscillations)
A limited number of clear pulses or a limited duration oscillation.
2. 8 impulse noise impulse noise
Noise that appears on a particular device and appears as a series of sharp pulses or transients
2. 9 pulse disturbance impulsive disturbance
Electromagnetic disturbances that occur on a particular device or device and that exhibit a series of sharp pulses or transients.
2. 10 continuous noise continuous noise
The effect on a particular device cannot be broken down into a series of noises with clearly identifiable effects.
2. 11 continuous disturbance
The effect on a particular device cannot be broken down into a series of electromagnetic disturbances with clearly identifiable effects.
2. 12 quasi-impact noise quasi-impulsive noise
Equivalent to the noise of the superposition of impulse noise and continuous noise.
2. 13 discontinuous interference discontinuous Interference
Electromagnetic interference that occurs during a certain time interval that is intermittently separated by interference.
2. 14 random noise radom noise
Given an unpredictable noise of instantaneous values.
2. 15 clicks Click
When measured by a prescribed method, electromagnetic disturbances whose duration does not exceed a specified value.
2. 16 click rate click rate
The number of clicks per unit time (usually per minute) that exceeds a specified level.
2. 17 fundamental (component) fundamental (component)
The first component of a periodic amount of the Bolieran series.
2. 18 harmonics (component) harmonic (component)
A component of a Fourier series of a periodic quantity that is higher than one.
2. 19 harmonic number harmonic number
The integer ratio of the harmonic frequency to the fundamental frequency. Note: The harmonic order is also called the harmonic order.
2. 20th harmonic ratio nth harmonic ratio
The ratio of the nth harmonic rms value to the fundamental rms value.
2. 21 harmonic content harmonic content
The amount obtained by subtracting its fundamental component from an alternating variable.
2. 22 fundamental coefficient
The ratio of the mean square value between the fundamental component and its associated intersection variable.
2. 23 (total) harmonic coefficient (total) harmonic factor
The ratio of the harmonic content to the rms value between its assigned variables.
2. 24 pulse pulsating
Used to represent the amount of periods with a non-zero mean.
2. 25 AC component alternating component
The amount obtained by removing the DC component from the pulsation.
Note: The AC component is sometimes referred to as the ripple content.
2. 26 ripple peak coefficient peak-ripple factor
The ratio of the peak-to-valley peak-to-valley difference to the absolute value of the DC component.
2. 27 ripple root mean square coefficient r. m. S-ripple factor
The ratio of the mean square value of the ripple ripple content to the absolute value of the DC component.
3 interference control
3. 1 (time variable)
Level of time (of a time varying quantity)
The average or weighted value of a time-like variable such as power or field parameter found in a prescribed time interval within a prescribed time interval. Note: Levels can be expressed in logarithms, such as the number of decibels relative to a reference value.
3.2 power disturbance mains-borne disturbance
Electromagnetic disturbance transmitted to the device via the power supply line.
3. 3 power immunity mains immunity
Immunity to power disturbances.
3. 4 power supply decoupling coefficient mains decoupling factor
The ratio of the voltage applied to a specified location of the power supply to the voltage value applied to the specified input of the device and producing the same disturbance effect on the device.
3. 5 casing radiation cabinet radiation
Radiation generated by the equipment enclosure does not include radiation from the connected antenna or cable.
3. 6 internal immunity
The ability of a device, device, or system to function properly without electromagnetic interference at its conventional input or antenna.
3. 7 external immunity
A device, device, or system that is capable of functioning properly without loss of performance in the event that electromagnetic disturbances invade via a route other than a conventional input or antenna.
3. 8 disturbance limit (allowed value) limit of disturbance
The maximum electromagnetic disturbance permissible level corresponding to the specified measurement method.
3. 9 interference limit (allowed value) limit of interference
Electromagnetic disturbances reduce the maximum allowable performance of a device, device or system.
3. 10 (electromagnetic) compatibility level (electromagnetic) compatibility level
The specified maximum electromagnetic disturbance level expected to be applied to a device, device or system operating on specified conditions.
Note: Actually the EMC level is not an absolute maximum and may be exceeded with a small probability.
3. 11 (the source of the disturbance) emission level (of a disturbance source)
A given level of magnetizing disturbance emitted by a particular device, device, or system as measured by a prescribed method.
3. 12 (from the source of the disturbance) emission limit (from a disturbing source)
The maximum emission level of the specified electromagnetic disturbance source.
3. 13 emission margin
The difference between the electromagnetic compatibility level of the device, device, or system and the emission limit.
3. 14 immunity level
The maximum level of disturbance when a given electromagnetic disturbance is applied to a device, device, or system while still functioning properly and maintaining the desired level of performance.
3. 15 immunity limit
The minimum immunity level specified.
3. 16 immunity margin
The difference between the immunity limit of the device, device, or system and the electromagnetic compatibility level.
3. 17 (electromagnetic) compatibility margin (electromagnetic) compatibility margin
The difference between the immunity level of the device, device, or system and the emission limit of the disturbance source.
3. 18 coupling coefficient coupling factor
In a given circuit, the electromagnetic quantity (usually voltage or current) is coupled from a specified position to another specified position, and the ratio of the target position to the corresponding electromagnetic quantity of the source position is the coupling coefficient.
3. 19 Coupling path
The path through which some or all of the electromagnetic energy is transmitted from a specified source to another circuit or device.
3. 20-coupled interference, ground-coupled interference
Electromagnetic interference caused by electromagnetic disturbances from a circuit being coupled to another circuit through a common ground or ground.
3. 21 grounding inductor earthing inductor, grounding inductor
An inductor in series with the ground conductor of the device.
3. 22 harassment suppression disturbance suppression
Measures to weaken or eliminate electromagnetic disturbances.
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