CN2682735Y - A device that prevents noisy signals due to uneven power distribution - Google Patents

Abstract

The utility model relates to a device for preventing noise signals from being generated due to uneven distribution of power supplies. It connects one or more cross-connected penetrating capacitors between independent power supplies of adjacent electronic circuit boards, and uses the penetrating capacitors to short circuit when direct current passes through. , when the alternating current passes through, it can filter out the characteristics of the noise signal, so as to prevent the noise signal from being generated due to the uneven distribution of the power supply. In addition, the two ends of the penetration capacitor can be connected here and the ground penetration capacitor can be connected without increasing the The low cost of circuit board layers effectively prevents the generation of noise signals.

Description

A device that prevents noisy signals due to uneven power distribution

technical field

The utility model is a device capable of preventing circuit boards from generating electromagnetic noise signal interference, especially a device capable of preventing noise signals generated due to uneven power distribution.

current technology

Each electronic circuit board of the printed circuit board (the electronic circuit board includes a power supply circuit board and an integrated circuit circuit board) has a power supply block, and each power supply block is connected to an independent power supply. The increase in parts density and functional requirements has caused the independent power supply division of each electronic circuit board to be chaotic, and the voltage distribution of each electronic circuit board is uneven, resulting in an unsmooth power supply circuit, and noise signals will be generated on the power supply block, thus Interfere with the function of other electronic circuit boards. The previous solution is to increase the number of layers or the area of the printed circuit board, so that the voltage distribution between the electronic circuit boards is averaged, and there will not be too much potential difference, which can effectively prevent the generation of noise signals, but increase the printed circuit board. The number of layers or area increases the cost of the printed circuit board accordingly.

Contents of the invention

The main purpose of this utility model is to provide a device to prevent noise signals from being generated due to uneven distribution of power supply. One or more jumper through capacitors are connected between the independent power supplies of adjacent electronic circuit boards. Short circuit when passing through, can filter out noise signal characteristics when alternating current passes through, to achieve the purpose of preventing noise signals from being generated due to uneven power distribution; More effective filtering of noise signals; since there is no need to increase the area or layers of printed circuit boards to eliminate noise signals, the cost of printed circuit boards can also be saved.

Description of drawings

Below, referring to the accompanying drawings, the above and other objects, features and advantages of the present invention will be apparent to those skilled in the art from the detailed description of the present invention.

Fig. 1 Fig. 1 is the circuit block diagram of the utility model.

Detailed ways

Please refer to shown in Fig. 1, in the figure box represents respectively the first independent power supply 1, the second independent power supply 2, the third independent power supply 3 etc. An independent power supply 1 and the second independent power supply 2 are connected with a jump-through capacitor 4, and a jump-through capacitor 5 is connected between the second independent power supply 2 and the third independent power supply 3, and so on until all adjacent Connect the jump-through capacitors between the two independent power supplies (not completely drawn in the figure), and multiple jump-through capacitors can also be connected between two adjacent independent power supplies, and the effect of filtering noise signals is more obvious . In addition, in order to make the ground noise signal (ground bounce) prevention effect of each independent power supply block better, the two ends of the jumper capacitor 4 can be connected in parallel with the ground through capacitor 101 and the ground through capacitor 201. Both ends of the through capacitor 5 can be connected in parallel with the ground through capacitor 202 and the ground through capacitor 301 , and so on, each of the two ends of the through capacitor is connected in parallel with a ground through capacitor (not completely shown in the figure).

When each independent power supply is powered on, due to the characteristics that the through capacitance is short-circuited when the direct current passes through, and the noise signal can be filtered out when the alternating current passes through, the noise signal on the first independent power supply 1 is filtered by connecting the through capacitance 4, Prevent the noise signal from being transmitted to the second independent power supply 2, and the noise signal on the second independent power supply 2 is filtered out by connecting the through capacitor 5, preventing the noise signal from being transmitted to the third independent power supply 3, and the subsequent independent power supply is thus Analogy (not shown in the figure). In addition, the noise signal on the first independent power supply 1 can be more effectively eliminated through the ground penetration capacitor 101, and the noise signal on the second independent power supply 1 can be more effectively eliminated through the ground penetration capacitor 201 and the ground penetration capacitance 202, as follows And so on (not shown in the figure).

Of course, according to the difference in the anti-noise signal capability of each electronic circuit board, a ground penetration capacitor can be connected to one end of the cross-connected through capacitor to eliminate the noise signal more effectively. If the anti-noise signal capabilities of the electronic circuit boards at both ends If the power supply is very strong, there is no need to add ground penetration capacitors at both ends of the jumper through capacitors; multiple jumper through capacitors can also be connected in series between independent power supplies.

In summary, the utility model achieves the purpose of preventing noise signals from being generated due to uneven power supply distribution by connecting one or more jumper through capacitors between the independent power supplies of adjacent electronic circuit boards. The two ends of the capacitor are connected with a ground penetration capacitor to more effectively prevent the generation of noise signals.

The above-mentioned utility model is only illustrated with the best embodiment, and those who have common knowledge in the technical field can make various changes, and these types of changes should be included in the spirit of the utility model and the scope of the claims .

Claims (2)

1, a kind of device that prevents to produce noise signal owing to power distribution is inhomogeneous, comprise at least two electronic circuit boards, one independent current source is all arranged on each electronic circuit board, it is characterized in that, be connected with a cross-over connection at least therein between the independent current source of two adjacent electronic circuit boards and run through electric capacity.

2, the device that prevents to produce noise signal according to claim 1 owing to power distribution is inhomogeneous, it is characterized in that the end of one at least that the described cross-over connection that is connected between adjacent electronic circuit board independent current source runs through electric capacity can in addition and connect a ground connection and run through electric capacity.

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