TWI573523B - Prevention and control of electrical signals are disturbed by the method and its circuit structure - Google Patents

Description

Method for preventing interference of electrical signals and circuit structure thereof

The invention relates to a method for preventing interference of an electrical signal and a circuit structure thereof, in particular to a problem that can prevent the circuit from being disturbed by electromagnetic wave interference (EMI) or radio frequency interference (RFI), and common mode interference generated by the same ground source. Make circuits, power supplies and systems work more correctly and properly.

The circuit is inevitably affected by various internal factors or external factors, which affects the correctness of its operation. However, the interference type is usually classified into a common mode interference (Common-Mode Interference) and a differential mode interference (Differential-Mode Interference) according to the interference mode. Common mode interference and differential mode interference are a common classification method. The common touch interference is the potential difference between the signal and the ground source, which is mainly formed by the power grid stringing, the potential difference between different grounding sources and the common state (same direction) voltage induced by the space electromagnetic radiation on the signal line. The common mode voltage is sometimes large, especially with a power supply with poor isolation performance, and the common mode voltage delivered is generally higher. The common mode voltage can be converted into a differential mode voltage through an asymmetric circuit, which directly affects the measurement and control signals, causing damage to the original device (this is the main reason for the high damage rate of the output/input (I/O) modules of some systems]. Common mode interference can be either DC or AC.

Differential mode interference refers to the interference voltage acting between the two poles of the signal. The voltage formed by the coupling of the space electromagnetic field between the signals and the common mode interference of the unbalanced circuit is directly superimposed on the signal, which directly affects the measurement and control accuracy. Circuit layout of conventional electronic devices Most of them are exposed on the surface of printed circuit boards, which are inevitably plagued by electromagnetic electromagnetic interference (EMI) or Radio Frequency Interference (RFI).

In addition, since the electronic signals such as signal lines, power supplies, and systems of the circuit are all connected to the same ground source, it is easy to cause common mode interference.

In view of this, the inventors of the present invention have researched and innovated, and have revealed the method and circuit structure for preventing the electric signal from being interfered by the present invention.

The object of the present invention is to provide a method for preventing interference of an electrical signal by hiding a signal line attached to any electrical circuit of the circuit board between any two insulating layers that are overlapped with each other to walk on the signal line. The electrical signal is not subject to interference.

The method for preventing electrical signals from being interfered by the present invention, wherein each of the electrical circuits is individually connected to a respective dedicated ground source, and the grounding sources are isolated from each other and are connected to each other. The electrical signal of the electrical circuit is not disturbed.

The method for preventing and controlling the electrical signal disclosed by the present invention is to connect the grounding end of the power supply of the electric circuit to the respective ground source independently, so that the electrical signals running on the signal line and the electric circuit are not received. Disruptor.

The method for preventing and controlling electrical signals disclosed by the present invention is to connect the grounding ends of the system loops to their respective grounding sources separately, so that the electrical signals traveling on the signal lines, the electrical circuits and the system loops are not disturbed.

The object of the present invention is to provide a circuit structure for preventing interference of an electrical signal, which is a circuit board comprising at least two layers of insulating layers laminated and attached to the circuit board. There is one less electrical circuit, and the signal line of the electrical circuit is hidden between any two insulating layers that are overlapped with each other, so that the electrical signal traveling on the signal line is not disturbed.

The circuit structure for preventing and controlling electrical signals from being disturbed by the present invention comprises at least two sets of electrical circuits and at least two sets of grounding sources, and each set of electrical circuit systems are individually connected to respective dedicated grounding sources, and the same The grounding sources are isolated from each other, so that the electrical signals traveling on the signal line and the electrical circuit are not disturbed.

The circuit structure for preventing and controlling an electrical signal according to the present invention further comprises at least one set of power supplies for supplying power to the electrical circuit, wherein the ground terminals of the power source are individually connected to a dedicated ground source to enable walking signals. The electrical signals of the line and the electrical circuit are not subject to interference.

The circuit structure for preventing and controlling electrical signals from being disturbed by the present invention is assigned to a system loop, and the grounding ends of the system loops are individually connected with their respective grounding sources to enable walking on signal lines, electrical circuits and system loops. The electrical signal is not subject to interference.

The desirable entities of the present invention can be clarified by the following description and the accompanying drawings.

(12)‧‧‧ boards

(13) (14) ‧ ‧ insulation

(151)(152)(161)(162)(D-)(D+)(TX-)(TX+)(RX-)(RX+)‧‧‧ Signal line

(GNDP) (GNDS) (GND1) (GND2) (GNDD) (GNDT) (GNDR) ‧‧‧ Ground Source

(P)‧‧‧Power

(S)‧‧‧System loop

First Figure: is an exploded perspective view of a first embodiment of the present invention.

The second figure is a three-dimensional combination diagram of the first figure.

Third Figure: A schematic diagram of a grounding of a second embodiment of the present invention.

Referring to the first and second figures, the method for preventing and suppressing electrical signals provided by the present invention is a signal line (D-) (D+) attached to any electrical circuit of the circuit board (12) (TX- ) (TX+)(RX-) or (RX+) is hidden between any two insulating layers (13) (14) that are overlapped with each other, so that walking on the signal line (D-) (D+) (TX-) (TX+ ) (RX-) or (RX+) electrical signals are not subject to interference.

Referring to the first to third figures, the method for preventing and controlling electrical signals is disclosed in the present invention, wherein the grounding ends of each of the electrical circuits are individually and their respective dedicated grounding sources (GND1) (GND2) (GNDD). (GNDT) (GNDR) is connected, and the ground source (GND1) (GND2) (GNDD) (GNDT) (GNDR) are isolated from each other so as to be in contact with the signal line (151) (152) ( 161) (162) (D-) (D+) (TX-) (TX+) (RX-) or (RX+) and the electrical signal of the electrical circuit are not disturbed.

Referring to the third figure, the method for preventing electrical signals from being interfered by the present invention is to connect the grounding end of the power supply (P) of the electric circuit to their respective ground source (GNDP). The electrical signals that travel on the signal lines (151) (152) (161) (162) and the electrical circuit are not disturbed.

Referring to the third figure, the method for preventing and controlling the electrical signal disclosed by the present invention is to connect the ground end of the system loop (S) to their respective ground source (GNDS) to walk on the signal line. (151) (152) (161) (162), the electrical circuit and the system circuit (S) electrical signals are not subject to interference.

Referring to the first to third figures, the circuit structure for preventing electrical signals from being disturbed by the present invention is a circuit board (12) comprising at least two layers of insulating layers (13) (14) laminated and connected to each other. At least one electrical circuit of the circuit board (12), and the signal line (151) (152) (161) (162) (D-) (D+) (TX-) (TX+) (RX-) of the electrical circuit or (RX+) is hidden between any two insulating layers (13) (14) that are overlapped with each other so as to walk on the signal line (151) (152) (161) (162) (D-) (D+) The electrical signal of (TX-)(TX+)(RX-) or (RX+) is not disturbed.

Referring to the third figure, the circuit structure for preventing and controlling electrical signals according to the present invention comprises at least two sets of electrical circuits and at least two sets of grounding sources (GND1) and (GND2), and each group of electrical circuits is Each of them is individually connected to a respective ground source (GND1) or (GND2), and the ground sources (GND1) and (GND2) are isolated from each other so as to be connected to the signal line (151) (152). ) (161) (162) and the electrical signals of the electrical circuit are not subject to interference.

Referring to the third figure, the circuit structure for preventing electrical signals from being interfered by the present invention further comprises at least one set of power sources (P) for supplying power to the electric circuit, wherein the grounding end of the power source (P) is separate. The ground is connected to a dedicated ground source (GNDP) so that the electrical signals traveling on the signal lines (151) (152) (161) (162) and the electrical circuit are not disturbed.

The circuit structure for preventing and controlling electrical signals from being disturbed by the present invention is assigned to a system loop (S), and the grounding ends of the system loops (S) are individually connected to their respective grounding sources (GNDS) to enable walking. The electrical signals at the signal lines (151) (152) (161) (162), the electrical circuit, and the system loop (S) are not disturbed.

The method for preventing and controlling electrical signals from being disturbed by the present invention and the circuit structure thereof can be modified and applied without departing from the spirit and scope of the present invention, and the present invention is not limited.

(12)‧‧‧ boards

(13) (14) ‧ ‧ insulation

(D-)(D+)(TX-)(TX+)(RX-)(RX+)‧‧‧ signal line

(GNDD)(GNDT)(GNDR)‧‧‧ Ground Source

Claims (6)

A method for preventing interference of an electrical signal is to shield a signal line attached to any electrical circuit of the circuit board between any two insulating layers that are overlapped with each other, so that an electrical signal traveling on the signal line is not disturbed. Wherein, the grounding wires that supply the power supply to the electrical circuit are individually connected to their respective grounding sources, so that the electrical signals traveling on the signal wires and the electrical circuits are not disturbed. The method of claim 1, wherein each of the electrical circuits is individually connected to a respective dedicated ground source, and the grounding sources are isolated from each other and are allowed to walk. The electrical signals of the signal lines and electrical circuits are not subject to interference. The method for disturbing the electric control signal according to claim 1 or 2 is to connect the grounding line of the system circuit separately to the respective ground source, so that the electric signals running on the signal line, the electric circuit and the system loop are not Subject to interference. A circuit structure for preventing interference of an electrical signal, comprising: a circuit board comprising at least two layers of insulating layers connected to each other; and at least one electrical circuit attached to the circuit board, wherein signal lines of the electrical circuit are hidden on each other Between any two insulating layers connected, the electrical signal traveling on the signal line is not disturbed; and at least one power supply is supplied to the electrical circuit, wherein the grounding wire of the power supply is separately connected to the respective ground source When connected, the electrical signals that travel on the signal line and the electrical circuit are not disturbed. The circuit structure for preventing interference of the electrical signal according to claim 4 includes at least two sets of electrical circuits and at least two sets of grounding sources, and each set of electrical circuits is individually connected to a respective dedicated ground source, and The grounding sources are isolated from each other and are not connected to each other, so that the electrical signals traveling on the signal line and the electrical circuit are not disturbed. The circuit structure for preventing the electric signal from being disturbed according to claim 4 or 5 is assigned to a system loop, and the grounding line of the system circuit is separately connected to the respective ground source to make the signal line and electricity The electrical signals of the loop and system loop are not subject to interference.