What is the use of NF3628 filter?

 According to different placement positions of filters, they are generally divided into on board filters and panel filters. NF3628 filters are installed on the circuit board, such as PLB and JLB series filters. The advantage of this filter is economy, while the disadvantage is that the effect of high-frequency filtering is not good. The main reasons are as follows: 1. There is no isolation between the input and output of the NF3628 filter, which is prone to coupling; 2. The grounding impedance of the filter is not very low, which weakens the high-frequency bypass effect; 3. A section of line between the filter and the chassis will produce two kinds of adverse effects: one is that the electromagnetic interference in the internal space of the chassis will directly induce this section of line, along the electrical

 According to different placement positions of filters, they are generally divided into on board filters and panel filters. NF3628 filters are installed on the circuit board, such as PLB and JLB series filters. The advantage of this filter is economy, while the disadvantage is that the effect of high-frequency filtering is not good. The main reasons are as follows: 1. There is no isolation between the input and output of the NF3628 filter, which is prone to coupling; 2. The grounding impedance of the filter is not very low, which weakens the high-frequency bypass effect; 3. A section of line between the filter and the chassis will produce two kinds of adverse effects: one is that the electromagnetic interference in the internal space of the chassis will directly induce this section of line, pass out of the chassis along the cable, and make the filter invalid with the help of cable radiation; The other is that before the external interference is filtered by the on-board filter, it generates radiation through this line, or directly couples with the circuit on the circuit board, causing sensitivity problems. The NF3628 filter is generally directly installed on the metal panel of the shielding case. Since the filter is directly installed on the metal panel, the input and output of the filter are isolated, the grounding is good, and the interference on the cable is filtered out on the chassis port, so the filtering effect is quite ideal. A section of wire between the NF3628 filter and the chassis will produce two kinds of adverse effects: one is that the electromagnetic interference in the interior space of the chassis will directly induce this section of wire, pass out of the chassis along the cable, and cause the filter to fail with the help of cable radiation; The other is that before the external interference is filtered by the on-board filter, it generates radiation through this line, or directly couples with the circuit on the circuit board, causing sensitivity problems.

 NF3628 filter is a filter circuit composed of capacitance, inductance and resistance, which can effectively filter the frequency point of a specific frequency in the power line or the frequency outside the frequency point to obtain a power signal of a specific frequency, or the power signal after eliminating a specific frequency. NF3628 filter is the basis of modern network synthesis method to design filters. All kinds of low-pass, high pass, band-pass and band stop filters are derived from this characteristic. Because of this, the design of the filter is simplified and the precision is improved. NF3628 filter components are divided into passive and active filters

 NF3628 filter is a filter circuit composed of capacitance, inductance and resistance, which can effectively filter the frequency point of a specific frequency in the power line or the frequency outside the frequency point to obtain a power signal of a specific frequency, or the power signal after eliminating a specific frequency. NF3628 filter is the basis of modern network synthesis method to design filters. All kinds of low-pass, high pass, band-pass and band stop filters are derived from this characteristic. Because of this, the design of the filter is simplified and the precision is improved. The components used in NF3628 filter are divided into passive and active filters. The passive filter only consists of passive components. It is formed by the principle that the reactance of capacitor and inductance components changes with frequency. The advantages of this type of filter are: the circuit is relatively simple, no DC power supply is required, and the reliability is high; Disadvantages: the signal in the passband has energy loss, and the load effect is obvious. When using inductive elements, it is easy to cause electromagnetic induction. When the inductance L is large, the volume and weight of the filter are large, and it is not applicable in the low frequency domain. Active filter: composed of passive components and active components. The advantages of this kind of filter are: the signal in the passband is not only free of energy loss, but also can be amplified, the load effect is not obvious, the interaction between multiple stages is small when connected, it is easy to form a high-order filter by using the simple method of cascade, and the filter is small in size, light in weight, and does not need magnetic shielding; Disadvantages: the passband range is limited by the bandwidth of active devices, which requires DC power supply, is not as reliable as passive filters, and is not applicable to high-voltage, high-frequency and high-power occasions.