Method for inhibiting electromagnetic interference and electromagnetic interference filter
An electromagnetic interference and filter technology, applied in the electronic field, can solve problems such as complex circuits and increased costs, and achieve the effect of simplifying circuits and saving costs
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Embodiment 1
[0023] Embodiment 1, the embodiment of the present invention provides a method for suppressing electromagnetic interference, including:
[0024] 101: Obtain the frequency points that need to suppress electromagnetic interference;
[0025] 102: Calculate the bias voltage required to suppress the electromagnetic interference at the above frequency point;
[0026] The above calculation of the bias voltage required to suppress the electromagnetic interference at the above frequency point includes: calculating the junction capacitance required to suppress the electromagnetic interference at the above frequency point; and calculating the bias voltage required for the varactor diode to provide the above junction capacitance.
[0027] 103: Set the above-mentioned bias voltage on a varactor diode connected in series with the electromagnetic interference device; one end of the above-mentioned varactor diode is connected to the above-mentioned electromagnetic interference device, and the...
Embodiment 2
[0035] Embodiment two, such as figure 2 As shown, the embodiment of the present invention also provides an electromagnetic interference filter, including:
[0036] A variable capacitance diode 202 connected in series with the electromagnetic interference device 201, one end of the above-mentioned variable capacitance diode 202 is connected to the above-mentioned electromagnetic interference device 201, and the other end is grounded;
[0037] A bias voltage control unit 203 is connected in parallel with the varactor diode 202, and the bias voltage control unit 203 is used to provide a bias voltage for the varactor diode 202;
[0038] One end of the electromagnetic interference device 201 of the above-mentioned EMI filter is connected to a resistor 204, and the other end is connected to a varactor diode 202;
[0039] refer to figure 2 , the signal that needs to use the EMI filter is input from one end of the above-mentioned resistor 204, passes through the resistor 204, and ...
Embodiment 3
[0050] Embodiment three, such as Figure 5 As shown, it is a schematic structural diagram of the EMI filter provided by the embodiment of the present invention. This structure can have many paths in the EMI filter to deal with the EMI in multiple lines in the device. Generally, there are 2 paths, 8 channels, 32 channels, etc., the specific number of channels does not affect the implementation of the embodiment of the present invention, and is not limited in this embodiment of the present invention. In the embodiment of the present invention, the varactor diode adopts a structure in which a diode D1 with a positive temperature coefficient and a diode D2 with a negative temperature coefficient are connected in parallel, and the EMI device takes a capacitor C1 as an example, and the capacitor C1 is connected to one end of the resistor R. A bias voltage is set at the middle connection part where the capacitor C1 is connected to the varactor diode, and the bias voltage can be set m...
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