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A current control method and device, and an electromagnetic interference filter circuit

A current control and anti-electromagnetic interference technology, applied in the electromagnetic field, can solve the problems that the internal magnetic field cannot cancel each other, the disturbance current suppression effect is limited, and the common-mode disturbance current is hindered, so as to achieve convenient and fast implementation and avoid the high-frequency disturbance current suppression effect Poor, resource-saving effect

Active Publication Date: 2019-04-26
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, due to the impedance imbalance between the two power boards, the current flowing through the two lines of the common mode inductor will be unequal.
If I1>I2, then I3<I4 from Equation 1, at this time, the internal magnetic fields of L1 and L2 cannot cancel each other, and it is easy to be magnetically saturated, and the common-mode inductor loses its ability to hinder the common-mode disturbance current
[0006] In order to allow the product to pass the market access test, the common method is to replace the common mode inductor with bilateral differential mode inductors, as shown in the attached figure 2 As shown, but the differential mode inductor has a limited effect on suppressing the high-frequency disturbance current, and it takes a lot of manpower, material resources and time to rectify it, which delays the time for the product to enter the market
[0007] If the service board has space, the common mode inductor can only be moved from the power board to the service board, but this limits the space for upgrading the function of the service board on the one hand, and on the other hand, from the perspective of the entire system, the cost is also greatly increased , because the number of service boards in the system is far greater than the number of power boards

Method used

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  • A current control method and device, and an electromagnetic interference filter circuit
  • A current control method and device, and an electromagnetic interference filter circuit
  • A current control method and device, and an electromagnetic interference filter circuit

Examples

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Embodiment 1

[0052] Such as image 3 As shown, this embodiment provides a current control method, including the following steps:

[0053] Step 301: Detect the current on each line where the anti-electromagnetic interference element is located;

[0054] Step 302: comparing the current on each line where the element is located;

[0055]Step 303: When the currents on the lines where the element is located are not equal, adjust the currents on the lines where the element is located so that the currents on the lines where the element is located are equal.

[0056] The current control method of this embodiment detects the current on each line where the anti-electromagnetic interference element is located in real time, and when it is found that the current on each line is not equal, adjust the current on the line in time to make the current on each line equal, which solves the problem The internal magnetic fields of the anti-interference components caused by the unequal currents on the lines ca...

Embodiment 2

[0081] Such as Figure 5 As shown, this embodiment provides a current control device, including: a current detection module, a current comparison module and a control module;

[0082] The current detection module is used to detect the current on each line where the anti-electromagnetic interference element is located;

[0083] The current comparison module is used to compare the current on each line where the element is located;

[0084] The control module is used for adjusting the current on the lines where the elements are located so that the currents on the lines where the elements are located are equal when the currents on the lines where the elements are located are unequal.

[0085] The current control device of this embodiment can monitor the current on the line where the anti-electromagnetic interference element is located in real time, and balance the current on each line in time when the current on each line is not equal, which solves the problem that the anti-elect...

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Abstract

The invention discloses a current control method, a current control device and an electromagnetic interference filter circuit. The current control method comprises the following steps: detecting currents of wires to which an electromagnetic interference-preventing element belongs; comparing the currents of the wires to which the element belongs; when the currents of the wires to which the element belongs are different, regulating the currents of the wires to which the element belongs so as to enable the currents of the wires to which the element belongs to be equal. Through the current control method, the current control device and the electromagnetic interference filter circuit, a problem of magnetic saturation of the electromagnetic interference-preventing element can be solved.

Description

technical field [0001] The invention relates to the field of electromagnetic technology, in particular to a current control method and device, and an electromagnetic interference filter circuit. Background technique [0002] The communication power supply plays an important role in the communication system. In order to improve the reliability of the communication system, the power supply boards in the system will adopt redundant backup. as attached figure 1 The following shows a typical configuration of a communication frame device. The power board adopts 1+1 backup, and the power board and service board are plugged into the motherboard. With the continuous improvement of people's demand for communication, the business volume and types are increasing, and the area of ​​the business board is becoming more and more tight. figure 1 In the power board, this type of power board is usually also called a power pass-through board. figure 1 The EMC (Electromagnetic Compatibility, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/44
CPCH02M1/44
Inventor 占伟张锁成
Owner ZTE CORP