CN114844519B - Isolation device for intrinsic safety circuit and non-intrinsic safety circuit - Google Patents
Isolation device for intrinsic safety circuit and non-intrinsic safety circuit Download PDFInfo
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- CN114844519B CN114844519B CN202210355574.5A CN202210355574A CN114844519B CN 114844519 B CN114844519 B CN 114844519B CN 202210355574 A CN202210355574 A CN 202210355574A CN 114844519 B CN114844519 B CN 114844519B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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Abstract
The embodiment of the application provides an isolation device of an intrinsic safety circuit and a non-intrinsic safety circuit, which comprises the following components: the radio frequency signal transmission unit and the at least one radio frequency signal loop unit; the radio frequency signal transmission unit comprises at least two capacitors, and each capacitor in the radio frequency signal transmission unit is connected in series in the radio frequency wiring and is used for transmitting radio frequency signals and blocking direct current signals; each radio frequency signal loop unit comprises at least two capacitors, and each capacitor in the same radio frequency signal loop unit is connected in series in a ground loop between an intrinsic safety circuit and a non-intrinsic safety circuit and is used for providing a loop path for radio frequency signals and blocking a direct current loop, so that the safety of the intrinsic safety circuit is improved.
Description
Technical Field
The application relates to the technical field of radio frequency circuits, in particular to an isolation device for an intrinsic safety circuit and a non-intrinsic safety circuit.
Background
Intrinsic safety circuits refer to intrinsically safe circuits, i.e., circuits in which any spark or thermal effect produced during normal operation of the device or in the event of a predictable failure is unable to ignite a defined flammable environment. If the radio frequency signals are transmitted between the intrinsic safety circuit and the non-intrinsic safety circuit, in order to prevent dangerous energy such as electric sparks and electric arcs in the non-intrinsic safety circuit from entering the intrinsic safety circuit, the two circuits cannot be directly connected, an isolation circuit needs to be added between the intrinsic safety circuit and the non-intrinsic safety circuit, and meanwhile normal transmission of the radio frequency signals between the intrinsic safety circuit and the non-intrinsic safety circuit is ensured, as shown in fig. 1 a.
Fig. 1b and 1C show circuit diagrams of an isolation circuit in the prior art, fig. 1C shows a layout schematic diagram of a PCB (Printed Circuit Board ) device of the isolation circuit in the prior art, including five capacitors of C1, C2, C3, C4 and C5, wherein the C1 string is used for transmitting Radio Frequency signals in an RF (Radio Frequency) line, the C2-C5 strings are connected in parallel and then connected in series to GND (Ground) to provide a return path for Radio Frequency signal transmission, and in order to reduce Radio Frequency transmission loss, GND distances D1 and D2 of the intrinsic and non-intrinsic safety circuits are both smaller than 0.5mm (millimeter). Any capacitor in the circuit is conducted in a fault manner, the isolating circuit is invalid, the GND distance is too small, and dangerous energy such as electric sparks, electric arcs and the like in a non-intrinsic safety circuit can be directly hit into the intrinsic safety circuit, so that potential safety hazards are generated.
Disclosure of Invention
The embodiment of the application aims to provide an isolation device for an intrinsic safety circuit and a non-intrinsic safety circuit so as to improve the safety of the intrinsic safety circuit. The specific technical scheme is as follows:
the embodiment of the application provides an isolation device for an intrinsic safety circuit and a non-intrinsic safety circuit, which comprises: the radio frequency signal transmission unit and the at least one radio frequency signal loop unit;
the radio frequency signal transmission unit comprises at least two capacitors, and each capacitor in the radio frequency signal transmission unit is connected in series in the radio frequency wiring and is used for transmitting radio frequency signals and blocking direct current signals;
each radio frequency signal loop unit comprises at least two capacitors, and each capacitor in the same radio frequency signal loop unit is connected in series in a ground loop between an intrinsic safety circuit and a non-intrinsic safety circuit and is used for providing a loop path for radio frequency signals and blocking a direct current loop.
In one embodiment of the present application, the isolation device further includes: the current limiting units comprise at least one resistor, the resistors in the same current limiting unit are connected in series, and the current limiting units are connected in series with the radio frequency wiring and the ground loop.
In one embodiment of the present application, the isolation device includes a plurality of the current limiting units, and each of the current limiting units is connected in parallel.
In one embodiment of the application, the isolation device is located in a printed circuit board, the printed circuit board comprising: the dielectric layer is positioned between the top layer and the bottom layer;
the isolation device comprises a radio frequency signal loop unit;
the current limiting unit and the radio frequency signal transmission unit are positioned on the top layer;
the radio frequency signal loop unit is positioned on the bottom layer.
In one embodiment of the application, the isolation device is located in a printed circuit board, the printed circuit board comprising: the dielectric layer is positioned between the top layer and the bottom layer;
the isolation device comprises at least two radio frequency signal loop units;
the current limiting unit and the radio frequency signal transmission unit are positioned on the top layer;
at least one radio frequency signal loop unit is positioned on the top layer, and other radio frequency signal loop units are positioned on the bottom layer.
In one embodiment of the present application, the isolation device further includes: a metal layer; the metal layer is positioned between two adjacent capacitors in the radio frequency signal loop unit.
In one embodiment of the present application, the metal layer is a copper foil layer.
In one embodiment of the present application, a width of the metal layer between two adjacent capacitors in the rf signal loop unit is greater than a width of a gap between the two capacitors.
In one embodiment of the present application, the isolation device further includes a top insulating layer structure, the top insulating layer structure is disposed in the top layer and located between the intrinsic safety circuit and the non-intrinsic safety circuit, and a total width of the top insulating layer structure is greater than a preset first threshold.
In one embodiment of the present application, the isolation device further includes a bottom insulating layer structure, the bottom insulating layer structure is disposed in the bottom layer and located between the intrinsic safety circuit and the non-intrinsic safety circuit, and a total width of the bottom insulating layer structure is greater than a preset second threshold.
The embodiment of the application has the beneficial effects that:
the isolation device of the intrinsic safety circuit and the non-intrinsic safety circuit provided by the embodiment of the application utilizes the radio frequency signal transmission unit comprising at least two capacitors to transmit radio frequency signals and block direct current signals, and utilizes the plurality of radio frequency signal loop units comprising at least two capacitors to provide loop paths for the radio frequency signals and block direct current loops, so that the isolation device is not influenced by the direct current signals in the process of transmitting the radio frequency signals, and meanwhile, the efficiency of radio frequency signal transmission is improved; and each capacitor in the radio frequency signal transmission unit is connected in series in the radio frequency wiring, each capacitor in the same radio frequency signal loop unit is connected in series in a ground loop between the intrinsic safety circuit and the non-intrinsic safety circuit, and a plurality of capacitors are respectively connected in series in different loop units, so that the voltage withstand value of the isolation device can be improved, the situation that direct current signals cannot be blocked due to single capacitor faults in the isolation device can be reduced, the risk of isolation failure caused by the overall fault conduction of the isolation device is reduced, the reliability of the isolation device is improved, and the safety of the intrinsic safety circuit is improved.
Of course, it is not necessary for any one product or method of practicing the application to achieve all of the advantages set forth above at the same time.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the application, and other embodiments may be obtained according to these drawings to those skilled in the art.
FIG. 1a is a schematic diagram of the location structure of an intrinsic safety circuit, a non-intrinsic safety circuit and an isolation circuit in the prior art;
FIG. 1b is a schematic diagram of a prior art isolation circuit;
FIG. 1c is a schematic diagram of a layout structure of a PCB device with an isolation circuit according to the prior art;
fig. 2 is a schematic circuit diagram of a first circuit structure of an isolation device for an intrinsic safety circuit and a non-intrinsic safety circuit according to an embodiment of the present application;
fig. 3a is a schematic circuit diagram of a second type of isolation device for an intrinsic safety circuit and a non-intrinsic safety circuit according to an embodiment of the present application;
fig. 3b is a schematic circuit diagram of a third circuit configuration of an isolation device for an intrinsic safety circuit and a non-intrinsic safety circuit according to an embodiment of the present application;
fig. 4a is a schematic plan view of a printed circuit board according to an embodiment of the present application;
fig. 4b is a schematic plan view of a first isolation device according to an embodiment of the present application in a printed circuit board;
fig. 5 is a schematic plan view of a second isolation device according to an embodiment of the present application in a printed circuit board;
fig. 6 is a schematic plan view of a third isolation device according to an embodiment of the present application in a printed circuit board;
fig. 7 is a schematic plan view of a fourth isolation device according to an embodiment of the present application in a printed circuit board.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. Based on the embodiments of the present application, all other embodiments obtained by the person skilled in the art based on the present application are included in the scope of protection of the present application.
Because the intrinsic safety circuit and the non-intrinsic safety circuit in the prior art need to be isolated, and the existing isolation circuit is easy to fail, potential safety hazards are brought to the intrinsic safety circuit. In order to solve the problem, the embodiment of the application provides an isolation device for an intrinsic safety circuit and a non-intrinsic safety circuit.
The isolation device for the intrinsic safety circuit and the non-intrinsic safety circuit provided by the embodiment of the application is described in detail below through specific embodiments.
Referring to fig. 2, fig. 2 provides a schematic circuit structure diagram of a first isolation device for an intrinsic safety circuit and a non-intrinsic safety circuit according to an embodiment of the present application, including:
the radio frequency signal transmission unit and the at least one radio frequency signal loop unit;
the radio frequency signal transmission unit comprises at least two capacitors, and each capacitor in the radio frequency signal transmission unit is connected in series in the radio frequency wiring and is used for transmitting radio frequency signals and blocking direct current signals;
each radio frequency signal loop unit comprises at least two capacitors, and each capacitor in the same radio frequency signal loop unit is connected in series in a ground loop between an intrinsic safety circuit and a non-intrinsic safety circuit and is used for providing a loop path for radio frequency signals and blocking a direct current loop.
The isolation device is positioned between the intrinsic safety circuit and the non-intrinsic safety circuit, is respectively communicated with the intrinsic safety circuit and the non-intrinsic safety circuit, isolates the intrinsic safety circuit from the non-intrinsic safety circuit, and enables the intrinsic safety circuit and the non-intrinsic safety circuit to transmit radio frequency signals under the condition of being not communicated with each other. In the embodiment of the application, the isolation device can be an isolation circuit, the isolation circuit is provided with a radio frequency wiring and a ground plane (also called a ground loop), wherein the radio frequency wiring is used for transmitting radio frequency signals, and the ground plane is respectively communicated with GND (ground) in the intrinsic safety circuit and the non-intrinsic safety circuit to form a ground loop between the intrinsic safety circuit and the non-intrinsic safety circuit, so that a loop passage is provided for transmitting the radio frequency signals.
When the isolation device is an isolation circuit, the radio frequency signal transmission unit is a part of a loop in the isolation circuit and comprises at least two capacitors, for example, two, three, four or the like; the capacitors in the radio frequency signal transmission units are mutually communicated, specifically, the radio frequency signal transmission units are positioned in the radio frequency wiring of the isolation circuit, and the capacitors in the radio frequency signal transmission units are connected in series, namely, the capacitors in the radio frequency signal transmission units are connected in series in the radio frequency wiring of the isolation circuit.
When the isolation device is communicated with the intrinsic safety circuit and the non-intrinsic safety circuit to isolate the intrinsic safety circuit and the non-intrinsic safety circuit, each capacitor connected in series in the radio frequency signal transmission unit enables the radio frequency signal transmission unit to transmit radio frequency signals and simultaneously block direct current signals. The direct current signal is an impurity signal in the process of radio frequency signal transmission.
The isolation circuit also comprises one or more radio frequency signal loop units, wherein the radio frequency signal loop unit is another part of loops which are positioned in the same circuit with the radio frequency signal transmission unit and are communicated with the radio frequency signal transmission unit. The radio frequency signal loop unit is located in the ground plane of the isolation circuit, and the ground plane of the isolation circuit is communicated with GND in the intrinsic safety circuit and the non-intrinsic safety circuit to form a ground loop between the intrinsic safety circuit and the non-intrinsic safety circuit, so that the radio frequency signal loop unit is located in the ground loop between the intrinsic safety circuit and the non-intrinsic safety circuit.
Each radio frequency signal loop unit comprises at least two capacitors, and all the capacitors in the same radio frequency signal loop unit are connected in series, namely all the capacitors in the same radio frequency signal loop unit are connected in series in a ground loop between the intrinsic safety circuit and the non-intrinsic safety circuit. When the isolation device comprises a plurality of radio frequency signal loop units, the plurality of radio frequency signal loop units are connected in parallel in a ground loop between the intrinsic safety circuit and the non-intrinsic safety circuit.
When the isolation device is communicated with the intrinsic safety circuit and the non-intrinsic safety circuit to isolate the intrinsic safety circuit and the non-intrinsic safety circuit, the capacitors connected in series in the radio frequency signal loop units provide loop paths for radio frequency signals, and meanwhile, the direct current loop can be blocked, the transmission of direct current signals is prevented, and the direct current signals are isolated.
As can be seen from the above, the isolation device for the intrinsic safety circuit and the non-intrinsic safety circuit provided by the embodiment of the application uses the radio frequency signal transmission unit comprising at least two capacitors to transmit radio frequency signals and block direct current signals, and uses the plurality of radio frequency signal loop units comprising at least two capacitors to provide loop paths for the radio frequency signals and block direct current loops, so that the isolation device is not affected by the direct current signals in the process of transmitting the radio frequency signals, and the efficiency of radio frequency signal transmission is improved; and each capacitor in the radio frequency signal transmission unit is connected in series in the radio frequency wiring, each capacitor in the same radio frequency signal loop unit is connected in series in a ground loop between the intrinsic safety circuit and the non-intrinsic safety circuit, and a plurality of capacitors are connected in series in different loop units respectively.
In an embodiment of the present application, referring to fig. 3a, fig. 3a is a schematic circuit diagram of a second type of isolation device for an intrinsic safety circuit and a non-intrinsic safety circuit in an embodiment of the present application, where the isolation device further includes:
the current limiting units comprise at least one resistor, the resistors in the same current limiting unit are connected in series, and the current limiting units are connected in series with the radio frequency wiring and the ground loop.
The isolation device may be an isolation circuit, and the current limiting unit may be a part of a loop in the isolation circuit, and the rf signal transmitting unit and the rf signal loop unit are located in the same circuit and are mutually communicated. The radio frequency signal transmission unit is positioned in the radio frequency wiring of the isolation circuit, the radio frequency signal loop unit is positioned in the ground loop between the intrinsic safety circuit and the non-intrinsic safety circuit, and the current limiting unit is positioned between the radio frequency wiring and the ground loop and is connected with the radio frequency wiring and the ground loop in series.
The isolation device may include one or more current limiting units, each of which may include one or more resistors therein. In the isolation device, each resistor in the same current limiting unit is connected in series, and different current limiting units are connected in parallel.
When the capacitors in the radio frequency signal transmission unit and the radio frequency signal loop unit in the isolation circuit are in fault, pulse energy can be instantaneously generated in the isolation device when the capacitors are in fault conduction, and the current limiting unit can limit the current in the isolation circuit, so that the pulse energy is buffered.
Therefore, the current limiting unit comprising at least one resistor is connected in series with the radio frequency wiring and the ground loop, so that the current of the loop in the isolation device can be limited, and when the capacitors in the radio frequency signal transmission unit and the radio frequency signal loop unit in the isolation device are in fault conduction, the risk of faults in the isolation device loop is reduced.
In an embodiment of the present application, referring to fig. 3b, a schematic circuit diagram of a third circuit configuration of an isolation device for an intrinsic safety circuit and a non-intrinsic safety circuit in the embodiment of the present application is provided. The isolation device may include a plurality of current limiting units, where each current limiting unit is connected in parallel, that is, each resistor in the same current limiting unit is connected in series and then connected in parallel with other current limiting units. After each current limiting unit is connected in parallel, the current limiting units are connected in series between the radio frequency wiring and the ground loop.
In the embodiment of the application, after being connected in parallel, each current limiting unit is connected between the radio frequency wiring and the ground loop in series, and even if a single current limiting unit fails, other current limiting units can still work normally, so that the safety of the isolation device can be improved.
In one embodiment of the present application, the isolation device is located in a printed circuit board, as shown in fig. 4a, and a schematic plan structure of the printed circuit board is provided, where the printed circuit board includes: the dielectric layer is positioned between the top layer and the bottom layer.
Referring to fig. 4b, fig. 4b provides a schematic plan view of a first type of isolation device in a printed circuit board, the isolation device comprising: a radio frequency signal loop unit;
the current limiting unit and the radio frequency signal transmission unit are positioned on the top layer;
the radio frequency signal loop unit is positioned on the bottom layer.
The printed circuit board is a support body of each electronic component in the practical application of the circuit and is used for mutually and electrically connecting each electronic component in the isolation device. The isolation device may be printed in the printed circuit board by electronic printing.
The isolation device comprises a radio frequency signal transmission unit, a radio frequency signal loop unit and a current limiting unit. The current limiting unit and the radio frequency signal transmission unit are positioned on the top layer of the printed circuit board, the radio frequency signal loop unit is positioned on the bottom layer of the printed circuit board, and the current limiting unit and the radio frequency signal transmission unit in the top layer are mutually communicated with the radio frequency signal loop unit in the bottom layer through the dielectric layer of the printed circuit board, so that the isolation device integrally forms a closed loop.
In one example, the rf signal transmission unit may be located directly above the rf signal loop unit.
From the above, when the isolation device of the intrinsic safety circuit and the non-intrinsic safety circuit provided by the embodiment of the application is positioned in the printed circuit board, the current limiting unit and the radio frequency signal transmission unit are positioned on the top layer of the printed circuit board, and the radio frequency signal loop unit is positioned on the bottom layer of the printed circuit board and communicated through the dielectric layer of the printed circuit board. The isolation device is printed on the printed circuit board, so that the usability of the isolation device in practical application is improved, and more operability is provided for the realization of the isolation device.
In one embodiment of the present application, as shown in fig. 5, there is provided a schematic plan view of a second type of isolation device in a printed circuit board, the isolation device being located in the printed circuit board, the printed circuit board comprising: the dielectric layer is positioned between the top layer and the bottom layer;
the isolation device comprises at least two radio frequency signal loop units;
the current limiting unit and the radio frequency signal transmission unit are positioned on the top layer;
at least one radio frequency signal loop unit is located in the top layer and other radio frequency signal loop units are located in the bottom layer.
The isolation device comprises a radio frequency signal transmission unit, at least two radio frequency signal loop units and a current limiting unit, namely a plurality of radio frequency signal loop units. The current limiting unit and the radio frequency signal transmission unit are positioned on the top layer of the printed circuit board. At least one radio frequency signal loop unit is positioned on the top layer of the printed circuit board, and is connected with the current limiting unit and the radio frequency signal transmission unit in the top layer, and other radio frequency signal loop units are positioned on the bottom layer of the printed circuit board. In fig. 5, two rf signal loop units are taken as an example, where one rf signal loop unit is located in the top layer and is located in the ground loop between the intrinsic safety circuit and the non-intrinsic safety circuit; the radio frequency signal loop unit is positioned in the top layer and is positioned in a ground loop between the intrinsic safety circuit and the non-intrinsic safety circuit; so that the isolation device as a whole forms a closed loop.
As can be seen from the above, the isolation device for the intrinsic safety circuit and the non-intrinsic safety circuit provided by the embodiment of the application comprises at least two radio frequency signal loop units, a current limiting unit and a radio frequency signal transmission unit, when the isolation device is positioned in the printed circuit board, the current limiting unit and the radio frequency signal transmission unit are positioned on the top layer of the printed circuit board, at least one radio frequency signal loop unit is positioned on the top layer of the printed circuit board, is connected with the current limiting unit and the radio frequency signal transmission unit in the top layer, and other radio frequency signal loop units are positioned on the bottom layer of the printed circuit board and are communicated with the loop units in the top layer through the dielectric layer of the printed circuit board. The isolation device with a richer structure is printed on the printed circuit board, and loops of the top layer and the bottom layer of the printed circuit board can be protected through the radio frequency signal loop unit, so that the usability of the isolation device in practical application is improved, and more operability is provided for the realization of the isolation device.
In one embodiment of the present application, referring to fig. 6, fig. 6 provides a schematic plan view of a third isolation device in a printed circuit board, where the isolation device further includes: a metal layer; the metal layer is positioned between two adjacent capacitors in the radio frequency signal loop unit.
The metal layer is made of conductive materials and is positioned between two adjacent capacitors in the radio frequency signal loop unit and used for communicating the two adjacent capacitors with each other. In one embodiment of the present application, the metal layer may be an aluminum foil layer made of aluminum foil, or the metal layer may be a copper foil layer, or a silver foil layer.
In an embodiment of the present application, a width of the metal layer between two adjacent capacitors in the rf signal loop unit is greater than a width of a gap between the two capacitors.
As can be seen from the above, the isolation device for the intrinsic safety circuit and the non-intrinsic safety circuit provided by the embodiment of the application further comprises a metal layer, wherein the metal layer can be a copper foil layer and is used for connecting two adjacent capacitors in the bottom layer radio frequency signal loop unit, meanwhile, the integrity of a radio frequency wiring structure between the capacitors in the top layer radio frequency signal transmission unit is ensured, and the transmission loss of radio frequency signals is reduced, so that the radio frequency signals can be effectively and efficiently transmitted in the isolation circuit in the printed circuit board. In addition, the width of the metal layer between two adjacent capacitors in the radio frequency signal loop unit is larger than the width of the gap between the two capacitors, so that the metal layer can be ensured to fill the gap between the two capacitors, the transmission loss of radio frequency signals can be further reduced, and the radio frequency signals can be effectively and efficiently transmitted in the isolation circuit.
In an embodiment of the present application, referring to fig. 7, fig. 7 provides a schematic plan view of a fourth isolation device in a printed circuit board, where the isolation device further includes a top insulating layer structure, the top insulating layer structure is disposed in the top layer and is located between the intrinsic safety circuit and the non-intrinsic safety circuit, and a total width of the top insulating layer structure is greater than a preset first threshold.
The top insulating layer structure is a layer structure of insulating material. The top insulating layer structure is located in the top layer of the printed circuit board where the isolation device is located and between the intrinsic safety circuit and the non-intrinsic safety circuit and is used for isolating the intrinsic safety circuit and the non-intrinsic safety circuit in the top layer of the printed circuit board in a physical layer, so that the total width of the top insulating layer structure can be the distance between the intrinsic safety circuit and the ground plane of the non-intrinsic safety circuit.
The preset first threshold value is a preset width value, and when the total width of the top insulating layer structure of the printed circuit board is larger than the width value, the intrinsic safety circuit and the non-intrinsic safety circuit can be effectively isolated.
As mentioned above, the rf signal transmission unit is located in the rf trace and is located in the top layer of the printed circuit board where the isolation device is located, and the total width D1 of the top insulating layer structure may be the same as the total width of the rf signal transmission unit.
In one example, the total width of the top insulating layer structure may be 12mm (millimeters).
In one embodiment of the present application, the isolation device further includes a bottom insulating layer structure, the bottom insulating layer structure is disposed in the bottom layer and located between the intrinsic safety circuit and the non-intrinsic safety circuit, and a total width of the bottom insulating layer structure is greater than a preset second threshold.
The bottom insulating layer structure is a layer structure of insulating materials. The above mentioned radio frequency signal loop unit is located in the ground loop between the intrinsic safety circuit and the non-intrinsic safety circuit, and only the radio frequency signal loop unit is located in the bottom layer of the printed circuit board where the isolation device is located. The bottom insulating layer structure is positioned in the bottom layer of the printed circuit board where the isolation device is positioned and between the intrinsic safety circuit and the non-intrinsic safety circuit and is used for isolating the intrinsic safety circuit and the non-intrinsic safety circuit in the bottom layer of the printed circuit board in a physical layer, so that the total width of the bottom insulating layer structure can be the distance between the intrinsic safety circuit and the ground plane of the non-intrinsic safety circuit. The bottom layer further includes a copper foil layer, and the copper foil layer may be located between two bottom insulating layer structures, for example, as shown in fig. 7, D2 and D3 are the widths of the two bottom insulating layer structures, respectively, and the layer structure in the middle of the two bottom insulating layer structures is the copper foil layer.
The preset second threshold is a preset width value, and when the total width of the bottom insulating layer structure of the printed circuit board is larger than the width value, namely the distance between the ground planes of the intrinsic safety circuit and the non-intrinsic safety circuit is larger than the width value, the intrinsic safety circuit and the non-intrinsic safety circuit can be effectively isolated.
The radio frequency signal loop unit is located at the bottom layer, and the total width (d2+d3) of the bottom insulating layer structure can be the same as the sum of the widths of the capacitors in the radio frequency signal loop unit.
In one example, the total width of the underlying insulating layer structure may be 6mm.
Therefore, the isolation device for the intrinsic safety circuit and the non-intrinsic safety circuit provided by the embodiment of the application can isolate the intrinsic safety circuit and the non-intrinsic safety circuit in physical layers respectively through the top insulating layer structure in the top layer and the bottom insulating layer structure in the bottom layer of the printed circuit board where the isolation device is positioned, so that the risk that dangerous energy in the non-intrinsic safety circuit is beaten into the intrinsic safety circuit is reduced, and the safety of the intrinsic safety circuit is improved.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application are included in the protection scope of the present application.
Claims (10)
1. An isolation device for an intrinsic safety circuit and a non-intrinsic safety circuit, wherein the isolation device comprises: the radio frequency signal transmission unit and the at least one radio frequency signal loop unit;
the radio frequency signal transmission unit comprises at least two capacitors, and each capacitor in the radio frequency signal transmission unit is connected in series in the radio frequency wiring and is used for transmitting radio frequency signals and blocking direct current signals;
each radio frequency signal loop unit comprises at least two capacitors, and each capacitor in the same radio frequency signal loop unit is connected in series in a ground loop between an intrinsic safety circuit and a non-intrinsic safety circuit and is used for providing a loop path for radio frequency signals and blocking a direct current loop.
2. The isolation device of claim 1, further comprising: the current limiting units comprise at least one resistor, the resistors in the same current limiting unit are connected in series, and the current limiting units are connected in series with the radio frequency wiring and the ground loop.
3. The isolation device of claim 2, wherein the isolation device comprises a plurality of the current limiting units, each of the current limiting units being connected in parallel.
4. The isolation device of claim 2, wherein the isolation device is located in a printed circuit board, the printed circuit board comprising: the dielectric layer is positioned between the top layer and the bottom layer;
the isolation device comprises a radio frequency signal loop unit;
the current limiting unit and the radio frequency signal transmission unit are positioned on the top layer;
the radio frequency signal loop unit is positioned on the bottom layer.
5. The isolation device of claim 2, wherein the isolation device is located in a printed circuit board, the printed circuit board comprising: the dielectric layer is positioned between the top layer and the bottom layer;
the isolation device comprises at least two radio frequency signal loop units;
the current limiting unit and the radio frequency signal transmission unit are positioned on the top layer;
at least one radio frequency signal loop unit is positioned on the top layer, and other radio frequency signal loop units are positioned on the bottom layer.
6. The isolation device of claim 4 or 5, further comprising: a metal layer; the metal layer is positioned between two adjacent capacitors in the radio frequency signal loop unit.
7. The separator device of claim 6, wherein said metal layer is a copper foil layer.
8. The isolation device of claim 6, wherein a width of the metal layer between two adjacent capacitors in the rf signal loop unit is greater than a width of a gap between the two capacitors.
9. The isolation device of claim 6, further comprising a top insulating layer structure disposed in the top layer between the intrinsic safety circuitry and the non-intrinsic safety circuitry, the total width of the top insulating layer structure being greater than a preset first threshold.
10. The isolation device of claim 6, further comprising a bottom insulating layer structure disposed in the bottom layer and between the intrinsic safety circuitry and the non-intrinsic safety circuitry, the total width of the bottom insulating layer structure being greater than a preset second threshold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210355574.5A CN114844519B (en) | 2022-04-06 | 2022-04-06 | Isolation device for intrinsic safety circuit and non-intrinsic safety circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210355574.5A CN114844519B (en) | 2022-04-06 | 2022-04-06 | Isolation device for intrinsic safety circuit and non-intrinsic safety circuit |
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| CN114844519A CN114844519A (en) | 2022-08-02 |
| CN114844519B true CN114844519B (en) | 2023-10-10 |
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| CN114844519A (en) | 2022-08-02 |
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