TWM485601U - Control signal disturbed circuit structure - Google Patents

Description

Circuit structure for preventing and controlling electrical signals from being disturbed

The present invention relates to a circuit structure for preventing electrical signals from being interfered, in particular, it can prevent the circuit from being disturbed by electromagnetic interference (EMI) or radio frequency interference (RFI), and the common mode interference generated by the same ground source, so that the circuit The power supply and system are operating correctly and more normally.

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. It is mainly composed of the space electromagnetic field coupled between the signals and the voltage formed by the unbalanced circuit to convert the common mode interference. Adding to the signal directly affects the measurement and control accuracy. Most of the circuit layouts of the conventional electronic devices are exposed on the surface of the printed circuit board, which is inevitably affected by the electromagnetic induction of the electromagnetic field (Electromagnetic Interference (EMI) or Radio Frequency Interference (Radio Frequency Interference). The trouble of RFI for short.

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 creators of this case have researched and innovated to reveal the circuit structure in which the prevention and control of electrical signals shown in the present invention are disturbed.

The purpose of the present invention is to provide 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, and a signal line of the electrical circuit It is hidden between any two layers of insulation layer that are overlapped with each other, so that the electrical signal traveling on the signal line is not disturbed.

The circuit structure for preventing 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 circuits is individually connected to a respective dedicated grounding source, 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 electrical signals from being disturbed by the present invention further comprises at least one set of power sources for supplying power to the electric circuit, wherein the grounding ends of the power sources 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 disclosed in the present invention for preventing and damaging electrical signals is assigned to a system loop, and the grounding ends of the system loops are individually connected to their respective grounding sources. The electrical signals that travel on the signal lines, electrical circuits, and system loops are not subject to interference.

The preferred 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 Fig.: 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: A schematic diagram of the grounding of the second embodiment of the present invention.

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 electrical signals from being disturbed by the present invention includes 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 power source The ground terminal of (P) is individually 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 disclosed in the present invention for preventing electrical signals from being interfered 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 circuit structure disclosed in the present invention for preventing and damaging electrical signals 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 (5)

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 layers of insulation connected, the electrical signal traveling on the signal line is not disturbed. The circuit structure for preventing interference of the electrical signal according to claim 1 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 interference of the electric signal according to claim 1 further comprising at least one set of power sources for supplying power to the electric circuit, wherein the grounding wires of the power source are separately connected to respective exclusive grounding sources to enable walking. The electrical signals on the signal line and the electrical circuit are not subject to interference. The circuit structure for preventing the electrical signal from being disturbed according to claim 2, further comprising at least one power supply for supplying power to the electrical circuit, wherein the grounding wire of the power source is separately connected to the respective ground source to enable walking The electrical signals on the signal line and the electrical circuit are not subject to interference. The circuit structure for preventing and controlling electrical signals according to any one of claims 1 to 4 is assigned to a system loop, and the grounding lines of the system loops are individually connected to respective exclusive grounding sources to enable walking. The electrical signals in the signal lines, electrical circuits and system loops are not subject to interference.