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Filter circuit

A filter circuit and filter capacitor technology, which is applied to circuit devices, printed circuit components, electrical components, etc., can solve problems such as difficulty in suppressing common-mode noise, and achieve a good effect of conduction noise

Pending Publication Date: 2022-05-06
ZHUHAI HAIMI SOFTWARE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a filter circuit for the problem that the existing filter circuit is difficult to suppress common mode noise

Method used

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Experimental program
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Effect test

Embodiment 1

[0034] Such as figure 1 The shown filter circuit includes a first PCB layer 101A and a second PCB layer 101C; the first PCB layer includes a power line 104, a power interface 107, a second filter capacitor 102, and a first filter capacitor 103; the power line 104 includes Power network 106, GND network 105; The second PCB layer 101C includes a conductor plane 109; The power interface 107 is connected to the GND network 105, and the power interface 107 is also connected to the conductor plane 109 through the first metal via 108; GND network 105 and the second filter One end of the capacitor 102 is connected, and the other end of the second filter capacitor 102 is connected to the conductor plane 109 through the third metal via 115; the power supply network 106 is connected to one end of the first filter capacitor 103, and the other end of the first filter capacitor 103 is connected through the second metal via. The hole 114 is connected to the conductor plane 109 . An intermed...

Embodiment 2

[0038] The difference between Embodiment 2 and Embodiment 1 is that it also includes a third filter capacitor 111, one end of the third filter capacitor 111 is connected to the power supply network 106, and the other end is connected to the GND network 105, such as image 3 shown.

[0039] The third filter capacitor 111 is added to further optimize the filtering effect of differential mode noise, because the third filter capacitor 111 provides another noise current path for differential mode noise, and the specific path is GND network 105 -> third filter capacitor 111 -> power supply Network 106 or power supply network 106->third filter capacitor 111->105GND network. The third filter capacitor 111 can be one filter capacitor or multiple filter capacitors, and the capacitance of the capacitor can be selected according to the required filter frequency, such as 1nF or 100pF.

[0040] Figure 5 It is the conduction noise test result of the filter circuit without using the circui...

Embodiment 3

[0043] The difference between Embodiment 3 and Embodiment 2 is that it also includes a first filtering module 112 and a second filtering module 113. The first filtering module 112 is arranged on the power supply network 106, and the second filtering module 113 is arranged on the GND network 105. The first filter module 112 and the second filter module 113 are inductors or magnetic beads or common mode choke coils, such as Figure 4 shown.

[0044] A first filtering module 112 and a second filtering module 113 are added to further optimize the filtering effect of common mode noise. The first filter module 112 and the second filter module 113 can be inductors, magnetic beads, and common mode choke coils. The number of the first filter module 112 and the second filter module 113 can be multiple, depending on the current size of the actual circuit and the desired filter frequency selection.

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PUM

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Abstract

The invention discloses a filter circuit. A first PCB layer is composed of a power line, a power interface, a second filter capacitor and a first filter capacitor. The power line comprises a power network and a GND network; the second PCB layer is provided with a conductor plane; the power interface is connected with a GND network and is also connected with the conductor plane; the GND network, the second filter capacitor and the conductor plane are connected in sequence; the power network, the first filter capacitor and the conductor plane are sequentially connected. The circuit design of the circuit structure and the overall layout design thought have a good suppression effect on common-mode noise, differential-mode noise, radiation noise and conduction noise.

Description

technical field [0001] The invention relates to filter technology, in particular to a filter circuit. Background technique [0002] Conducted noise and radiated noise at the power interface of electronic products connected to an external power supply have very strict test requirements. If the noise exceeds the standard, it will affect the normal operation of other electronic products and affect its own circuit performance and stability. [0003] Commonly used filtering circuits include passive filtering and active filtering. The main forms of passive filtering include capacitor filtering, inductive filtering, and complex filtering (L-type, LC filtering, RC filtering, etc.). The main form of active filtering is active RC filtering, that is, electronic filtering. [0004] The noise in the power supply part includes differential mode noise and common mode noise. Ordinary filter circuits are generally only effective for differential mode noise and cannot solve the impact of com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H7/01H05K1/02H05K1/16H02M1/44
CPCH03H7/01H03H7/0138H03H7/0153H03H7/0115H05K1/0216H05K1/0298H05K1/162H05K1/165H02M1/44H02M3/003H02M7/003H02M1/123H02M1/126H05K1/0233H05K1/0231H05K1/115H05K2201/10015H05K2201/1006H05K2201/093H05K1/0262H05K1/0218
Inventor 骆云龙亚历克斯·漆史歌漆一宏薛瑞尼金荣皓
Owner ZHUHAI HAIMI SOFTWARE TECH CO LTD
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