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Electromagnetic interference filter circuit

An electromagnetic interference filtering and filtering circuit technology, applied in circuits, inductors, electrical components, etc., can solve the problems of cumbersomeness, poor suppression effect, application limitations of passive electromagnetic interference filters, etc., to achieve miniaturization, improve high The effect of frequency characteristics

Pending Publication Date: 2020-09-01
ORMON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Passive electromagnetic interference filters have been widely used to suppress the influence of electromagnetic interference generated by electricity consumption on the power grid. However, as the design requirements for miniaturization, light weight, and integration of devices increase year by year, passive electromagnetic interference filters are large in size and Disadvantages such as bulkiness and poor suppression effect are becoming more and more prominent
These problems limit the application of passive EMI filters

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0040] Embodiment 1 of the present application provides a common mode choke coil.

[0041] figure 1 is a schematic diagram of the common mode choke coil of this embodiment. like figure 1 As shown, the common mode choke coil 10 has: a first primary winding 11 , a second primary winding 12 and a secondary winding 13 . Wherein, the secondary winding 13 is electromagnetically coupled with the first primary winding 11 and the second primary winding 12 .

[0042] In this embodiment, the number of turns of the first primary winding 11 is N1, the number of turns of the second primary winding 12 is N2, and the number of turns of the secondary winding 13 is Ns. like figure 1 As shown, N1 is greater than Ns, and N2 is greater than Ns.

[0043] In the common mode choke coil 10 of this embodiment, the number of turns of the first primary winding 11 and the second primary winding 12 is more, therefore, the first primary winding 10 and the second primary winding 11 can play a role The ...

Embodiment 2

[0071] Embodiment 2 of the present application provides an electromagnetic interference (EMI) filter circuit. The electromagnetic interference filter circuit has a common mode choke coil as described in Embodiment 1.

[0072] Figure 4 is a schematic diagram of the electromagnetic interference filter circuit of this embodiment, such as Figure 4 As shown, the EMI filtering circuit 40 includes: a common mode choke coil 10 , an operational amplifier 41 and a current injection network 42 .

[0073] like Figure 4 As shown, the common mode choke coil 10 is the common mode choke coil described in Embodiment 1, and the description about the common mode choke coil 10 in Embodiment 1 is incorporated herein.

[0074] like Figure 4 As shown, one end 111 of the first primary winding 11 of the common mode choke coil 10 is connected to the first output end 401 of the impedance stabilization network (LISN) 400, and one end 121 of the second primary winding 12 is connected to the impeda...

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Abstract

The embodiment of the invention provides a common mode choke and an electromagnetic interference filter circuit. The common mode choke is provided with a first primary side winding, a second primary side winding, a secondary side winding, and the secondary side winding is electromagnetically coupled with the first primary side winding and the second primary side winding. The common mode choke alsocomprises a first resistor (RCT) and a first inductor (La) which are connected to the two ends of the secondary side winding in series. The number of turns of the first primary side winding is largerthan the number of turns of the secondary side winding, and the number of turns of the second primary side winding is larger than the number of turns of the secondary side winding. According to the embodiment, the number of turns of the primary windings of the common mode choke is set to be larger, and the common mode interference suppression function can be integrated on the basis of a detectionfunction, and therefore the integration of an active filter and a passive filter is facilitated, and the miniaturization of the filter is achieved; the inductor is connected in series with the secondary winding of the common mode choke, so that the high-frequency characteristic of the common mode choke can be improved.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a common mode choke coil and an electromagnetic interference filter circuit. Background technique [0002] The electrical equipment connected to the power grid will generate electromagnetic interference (Electro-Magnetic–Interference, EMI), which may have a negative impact on the normal operation of the power grid. Therefore, the electrical equipment connected to the power grid needs to meet the conduction electromagnetic interference limit requirements set by the region where the power grid is located. [0003] Generally, conducted electromagnetic interference filters can be used to solve the electromagnetic interference problems generated by electrical equipment. Common conducted EMI filters include: passive EMI filters, active EMI filters, and passive and active hybrid EMI filters. [0004] Passive electromagnetic interference filters have been widely used to suppr...

Claims

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Application Information

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IPC IPC(8): H02J3/01
CPCH02J3/01H01F27/00H01F37/00H03H7/09H03H11/04Y02E40/40
Inventor 戴立宇陈文洁郑明华
Owner ORMON CORP