CN217721568U - Electrical equipment ground isolating device - Google Patents
Electrical equipment ground isolating device Download PDFInfo
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- CN217721568U CN217721568U CN202221341804.4U CN202221341804U CN217721568U CN 217721568 U CN217721568 U CN 217721568U CN 202221341804 U CN202221341804 U CN 202221341804U CN 217721568 U CN217721568 U CN 217721568U
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Abstract
The utility model relates to an electrical equipment field discloses an electrical equipment ground isolating device, include: the metal shell, the inside of the metal shell is an electrical cabin; the inner wall of the electric bin is provided with a grounding column, an electronic component and an external power interface, the grounding column is connected with an external power through a low-impedance power input line, and the grounding column is respectively connected with the electronic component and the ground wire end of the external power interface through a low-impedance connecting line, so that the voltage can be released out through a ground loop in the shortest time under the condition that a live wire is in contact with the shell, and the human body is prevented from being injured when contacting with equipment; an isolation capacitor and an isolation resistor are arranged between a shell ground and a power ground of the printed circuit board, a magnetic bead is arranged between the power ground and a simulation ground, components on the printed circuit board are reasonably isolated, static electricity and conduction disturbance absorbed by the shell ground are isolated in the shell ground, adverse effects of communication link interference, power ripple increase and the like caused by conduction to the power ground are avoided, and the running stability of equipment is improved.
Description
Technical Field
The utility model relates to an electrical equipment field especially relates to an electrical equipment ground isolating device.
Background
In the control system, there are roughly the following ground wires: (1) the shell ground, also called as a shielding ground, is arranged for preventing static induction and magnetic field induction; (2) a direct current power supply ground, a ground of a direct current power supply; (3) an ac power supply ground, the ground line of an ac power supply, which is typically a noise-producing ground; (4) analog ground, zero potential of various analog quantity signals; (5) digital ground, also called logical ground, is the zero potential of the various switching value (digital value) signals; (6) the signal ground is typically the sensor ground.
The traditional electrical equipment cabinet has an application scene of mixed application of a machine shell ground, a power ground (particularly a direct-current power ground in the document, the same below) and a signal ground, when connection topology and isolation measures among various grounds are not correctly processed, the traditional electrical equipment cabinet often easily causes disordered signal transmission, instable equipment power consumption, overlarge external interference, serious time and even potential safety hazards, and easily generates static electricity after long-term operation, and the traditional electrical equipment cabinet can cause the problems of instable signal transmission link, easy electric shock and the like when accumulated to a certain degree. When the shell is not correctly grounded, after a zero line or a live line is contacted with equipment, a leakage path is formed by a human body after the human body is contacted with the shell, and the human body is electrically shocked; when the direct current ground is directly connected with the shell ground, if the direct current positive electrode and the shell are in short circuit, a conducting loop can be formed through the shell ground, and the direct current positive electrode and the direct current negative electrode are in short circuit, so that the rear end current is too large, the fuse is burnt out, or a wire is damaged under the condition of no fuse, and the normal work of the electrical equipment is influenced. The above ground wire processing is an important problem in system design, installation and debugging, and therefore, it is necessary to use a reasonable isolation device for electrical equipment to solve the above problem.
SUMMERY OF THE UTILITY MODEL
The utility model provides an electrical equipment ground isolating device solves the safety problem that brings when various ground wire connections mix.
An electrical equipment ground isolation device comprising: the metal shell is internally provided with an electrical bin;
the grounding column, the electronic component and an external power interface are fixed on the inner wall of the electric bin, the external power interface is connected with an external power through a low-impedance power input line, and the grounding column is respectively connected with the electronic component and a grounding terminal of the external power interface through a low-impedance connecting line; the impedance value of the low-impedance power input line and the low-impedance connecting line is less than 100m omega.
Furthermore, a printed circuit board is arranged inside the electronic component; the printed circuit board is provided with an RJ45 connector, a USB connector, a shell ground, a power ground and an analog ground, an isolation capacitor and an isolation resistor are connected between the shell ground and the power ground in parallel, and a magnetic bead or zero ohm resistor is arranged between the power ground and the analog ground.
Furthermore, the RJ45 connector and the USB connector are both disposed on the chassis ground, and the chassis ground is electrically connected to the metal chassis.
Furthermore, the grounding pole is a conductive stud, and the diameter of the conductive stud is not less than 3.5mm.
Furthermore, a bin door is arranged on the metal casing, the bin door and the external power interface are positioned on two corresponding sides of the metal casing, and the area of the metal contact surface of the bin door and the metal casing is not less than 38.5mm2。
Further, the isolation capacitor is a high withstand voltage capacitor.
The utility model discloses following beneficial effect has:
(1) The utility model discloses a set up low impedance power input line, earthing pole and be connected with outer power interface, electronic parts respectively through low impedance connecting wire between outer power and outer power interface, can be under the condition of live wire and shell contact, go out voltage through the fastest release of ground return circuit in the shortest time to do not receive the injury when guaranteeing human contact means, improved the power consumption security of equipment.
(2) The high-voltage-resistant isolating capacitor and the isolating resistor are arranged between the shell ground of the printed circuit board and the power ground, the magnetic beads are arranged between the power ground and the simulation ground, components on the printed circuit board are reasonably isolated, static electricity and conduction disturbance absorbed by the shell ground are isolated in the shell ground, the conduction to the power ground is avoided, adverse effects such as communication link interference and power ripple increase are avoided, and the running stability of the equipment is improved.
Drawings
FIG. 1 is a schematic view of the overall connection of the device of the present invention;
fig. 2 is a schematic structural diagram of the middle printed circuit board of the present invention.
In the figure: 1-a metal housing; 2-an electric bin; 201-bin gate; 3-a grounding post; 4-an electronic component; 5-metal contact surface; 6-a printed circuit board; 601-mounting holes; 602-RJ45 connectors; 603-a USB connector; 604-chassis ground; 605-power ground; 606-analog ground; 607-isolation capacitance; 608-isolation resistance; 609-magnetic beads; 7-external power supply; 701 — external power interface.
Detailed Description
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.
Referring to fig. 1 and 2, the present invention provides an electrical equipment ground isolation device, including: the metal cabinet 1 is formed by assembling metal structural blocks, and an electric cabin 2 is arranged inside the metal cabinet 1; in order to achieve a reasonable ground isolation effect, the area of the metal contact surface 5 between the metal structure blocks of the metal casing 1 should be not less than the circular contact area with the diameter of 3.5mm (i.e. the contact area is more than or equal to 38.5 mm)2) Or other forms of contact; the door 201 of the electrical cabin 2 is arranged at the opposite side of the external power interface 701, and the area of the door 201 and the metal contact surface 5 of the metal casing 1 is equal to or larger than 38.5mm2。
The inner wall of the electric cabin 2 is fixed with a grounding pole 3, an electronic component 4 and an external power interface 701, and the external power interface 701 has a wire diameter of 2.5mm2The low-impedance power input line of the grounding column 3 is connected with an external power 7, and the grounding column 3 is respectively connected with the electronic component 4 and a grounding terminal of an external power interface 701 through a low-impedance connecting line with the wire diameter AWG 16; the impedance value of the low-impedance power input line and the low-impedance connecting line is less than 100m omega. The requirement can ensure that the connection impedance between all electrostatic contact surfaces of the equipment is maintained within 100m omega, and when static electricity or short circuit is received, accumulated charge or short circuit current is quickly led out and flows back to the ground, so that the personal safety of human body contact conditions is ensured.
The grounding post 3 is preferably a conductive stud, the diameter of the conductive stud is 4mm, the size is moderate, and the occupied space position is reduced while the conductivity is good.
The metal shell of the electronic component 4 is fixedly connected with the metal inner wall of the electric bin 2 through the mounting hole 601, and the ground wire in the interface alternating current power line is fixedly connected with the grounding column 3 in relation to the power supply of alternating current equipment.
The printed circuit board 6 inside the electronic component 4 is fixedly connected to the metal case of the electronic component 4 through the mounting hole 601.
The RJ45 connector 602, the USB connector 603 shell and the mounting hole 601 on the printed circuit board 6 are connected to the chassis ground 604 through copper sheets; a high-voltage isolation capacitor 607 and an isolation resistor 608 are connected between a power ground 605 and a machine shell ground 604 on the printed circuit board 6 in parallel for isolation, the value of the isolation capacitor 607 is 1000pF/2KV, and the value of the isolation resistor 608 is 4.7 MOmega; the analog ground 606 on the printed circuit board 6 is isolated from the power ground 605 by using a magnetic bead 609 or a zero ohm resistor; the signal ground on the printed circuit board 6 may also be directly connected to the power ground 605; when the shell ground 604, the power ground 605 and the signal ground of the printed circuit board 6 are paved with copper, a closed loop is not formed; in addition, printed circuit board 6 has metal connectors on board, and the connector housing and mounting holes 601 are connected to chassis ground 604 by copper.
Considering from power input, structure contact point, connecting wire rod, a plurality of aspect of printed circuit board standard, designed the utility model discloses the device, perfect the ground among the electrical equipment and kept apart the processing, standardized the complete set nature processing scheme that circuit design, structural design, equipment required, can improve equipment's stability and security that dispatches from the factory greatly to reduce the maintenance cost and the modification cost in equipment later stage.
The foregoing is merely a preferred embodiment of the invention, which does not represent all possible forms thereof, and the scope of the invention is not limited to such specific statements and embodiments. Various other modifications and improvements may be made in accordance with the teachings of the present disclosure without departing from the spirit thereof and still be within the scope thereof.
Claims (6)
1. An electrical equipment ground isolation apparatus, comprising: the electric cabinet comprises a metal casing (1), wherein an electric bin (2) is arranged inside the metal casing (1);
a grounding column (3), an electronic component (4) and an external power interface (701) are fixed on the inner wall of the electric bin (2), the external power interface (701) is connected with an external power supply (7) through a low-impedance power input line, and the grounding column (3) is respectively connected with the grounding terminals of the electronic component (4) and the external power interface (701) through low-impedance connecting lines; the impedance value of the low-impedance power input line and the low-impedance connecting line is less than 100m omega.
2. The electrical equipment ground isolation device according to claim 1, characterized in that: a printed circuit board (6) is arranged inside the electronic component (4); the printed circuit board (6) is provided with an RJ45 connector (602), a USB connector (603), a shell ground (604), a power ground (605) and a simulation ground (606), an isolation capacitor (607) and an isolation resistor (608) are connected between the shell ground (604) and the power ground (605) in parallel, and a magnetic bead (609) or a zero ohm resistor is arranged between the power ground (605) and the simulation ground (606).
3. The electrical equipment ground isolation device according to claim 2, characterized in that: the RJ45 connector (602) and the USB connector (603) are both arranged on the shell ground (604), and the shell ground (604) is electrically connected with the metal shell (1).
4. The electrical equipment ground isolation device according to claim 1, characterized in that: the grounding post (3) is a conductive stud, and the diameter of the conductive stud is not less than 3.5mm.
5. The electrical equipment ground isolation device according to claim 1, characterized in that: the metal casing (1) is provided with a bin door (201), the bin door (201) and the external power interface (701) are located on two corresponding sides of the metal casing (1), and the area of a metal contact surface (5) of the bin door (201) and the metal casing (1) is not less than 38.5mm2。
6. The electrical equipment ground isolation device according to claim 2, characterized in that: the isolation capacitor (607) is a high withstand voltage capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221341804.4U CN217721568U (en) | 2022-05-30 | 2022-05-30 | Electrical equipment ground isolating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221341804.4U CN217721568U (en) | 2022-05-30 | 2022-05-30 | Electrical equipment ground isolating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217721568U true CN217721568U (en) | 2022-11-01 |
Family
ID=83795956
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221341804.4U Active CN217721568U (en) | 2022-05-30 | 2022-05-30 | Electrical equipment ground isolating device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217721568U (en) |
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2022
- 2022-05-30 CN CN202221341804.4U patent/CN217721568U/en active Active
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