CN114844519A - Isolating device for intrinsic safety circuit and non-intrinsic safety circuit - Google Patents
Isolating device for intrinsic safety circuit and non-intrinsic safety circuit Download PDFInfo
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- CN114844519A CN114844519A CN202210355574.5A CN202210355574A CN114844519A CN 114844519 A CN114844519 A CN 114844519A CN 202210355574 A CN202210355574 A CN 202210355574A CN 114844519 A CN114844519 A CN 114844519A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- 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
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Abstract
The embodiment of the application provides an isolating device of this ampere of circuit and not this ampere of circuit, includes: the radio frequency signal transmission unit and 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 a radio frequency wire and used for transmitting a radio frequency signal and blocking a direct current signal; 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 the intrinsic safety circuit and the non-intrinsic safety circuit and used for providing a loop path for a radio frequency signal and blocking a direct current loop, so that the safety of the intrinsic safety circuit is improved.
Description
Technical Field
The present application relates to the field of radio frequency circuits, and in particular, to an intrinsically safe circuit and a non-intrinsically safe circuit isolation device.
Background
Intrinsically safe circuits are circuits which are intrinsically safe, i.e. circuits in which any electrical spark or thermal effect produced during normal operation or in the presence of a predictable fault of the device cannot ignite a defined flammable environment. If the intrinsic safety circuit and the non-intrinsic safety circuit transmit radio frequency signals, in order to prevent dangerous energy such as electric sparks, electric arcs and the like 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, the radio frequency signals between the intrinsic safety circuit and the non-intrinsic safety circuit are guaranteed to be normally transmitted, as shown in fig. 1 a.
As shown in fig. 1b and fig. 1C, fig. 1b is a Circuit diagram of a prior art isolation Circuit, fig. 1C is a schematic diagram of a PCB (Printed Circuit Board) device layout of the prior art isolation Circuit, and includes five capacitors C1, C2, C3, C4, and C5, a series of C1 is connected in a Radio Frequency (RF) line for transmitting RF signals, and a series of C2 to C5 are connected in parallel and then connected in series to GND (Ground, Ground plane) to provide a return path for transmitting RF signals, and in order to reduce RF transmission loss, distances between D1 and D2 of the intrinsically and intrinsically circuits are both less than 0.5mm (millimeter). Any capacitor in the circuit is conducted in a fault mode, the isolation circuit fails, the GND distance is too small, dangerous energy such as electric sparks and electric arcs in the non-intrinsic safety circuit can be directly sent to the intrinsic safety circuit, and potential safety hazards are generated.
Disclosure of Invention
An object of the embodiment of the present application is to provide an isolation device for an intrinsically safe circuit and a non-intrinsically safe circuit, so as to improve the safety of the intrinsically safe circuit. The specific technical scheme is as follows:
the embodiment of the application provides an isolating device of this ampere of circuit and not this ampere of circuit, isolating device includes: the radio frequency signal transmission unit and 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 a radio frequency wire and used for transmitting a radio frequency signal and blocking a direct current signal;
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 the intrinsic safety circuit and the non-intrinsic safety circuit and used for providing a loop path for a radio frequency signal and blocking a direct current loop.
In one embodiment of the present application, the isolation device further comprises: each current limiting unit comprises at least one resistor, the resistors in the same current limiting unit are connected in series, and the current limiting unit is connected with the radio frequency wiring and the ground loop in series.
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 present 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 present 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 comprises: a metal layer; the metal layer is located 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 an embodiment of the present application, a width of a 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 an 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 an embodiment of this application, isolating device still includes bottom insulating layer structure, bottom insulating layer structure sets up in the bottom, and be located this ampere of circuit with between the non-this ampere of circuit, bottom insulating layer structure's total width is greater than and predetermines the second threshold value.
The embodiment of the application has the following beneficial effects:
according to the isolating device of the intrinsic safety circuit and the non-intrinsic safety circuit, the radio frequency signal transmission unit comprising the at least two capacitors is used for transmitting the radio frequency signals and blocking the direct current signals, and then the radio frequency signal loop units comprising the at least two capacitors are used for providing loop access for the radio frequency signals and blocking the direct current loops, so that the isolating 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 withstand voltage value of the isolation device can be improved, the condition that a direct current signal cannot be blocked due to the fault of a single capacitor in the isolation device can be reduced, the risk of isolation failure caused by the integral 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 product or method of the present application to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and it is also obvious for a person skilled in the art to obtain other embodiments according to the drawings.
FIG. 1a is a schematic diagram of the position structure of an intrinsic circuit, a non-intrinsic circuit and an isolation circuit in the prior art;
FIG. 1b is a schematic circuit diagram of an isolation circuit in the prior art;
FIG. 1c is a schematic diagram of a layout structure of a PCB device of an isolation circuit in the prior art;
fig. 2 is 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 disclosure;
fig. 3a is a schematic circuit structure diagram of an isolation device of a second intrinsic safety circuit and a non-intrinsic safety circuit according to an embodiment of the present disclosure;
fig. 3b is a schematic circuit structure diagram of a third intrinsically safe circuit and an isolation device of a non-intrinsically safe circuit according to an embodiment of the present disclosure;
Fig. 4a is a schematic plan view illustrating a printed circuit board according to an embodiment of the present disclosure;
fig. 4b is a schematic plan view of a first isolation device provided in an embodiment of the present application in a printed circuit board;
fig. 5 is a schematic plan view of a second isolation device provided in an embodiment of the present application in a printed circuit board;
fig. 6 is a schematic plan view of a third isolation device provided in an embodiment of the present application in a printed circuit board;
fig. 7 is a schematic plan view of a fourth isolation device provided in an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the description herein are intended to be within the scope of the present disclosure.
Because this ampere of circuit among the prior art needs to keep apart with this circuit between, and current isolation circuit is inefficacy easily to bring the potential safety hazard for this ampere of circuit. In order to solve this problem, embodiments of the present application provide an isolation device for an intrinsic safety circuit and a non-intrinsic safety circuit.
The following describes in detail the isolation device of the intrinsic safety circuit and the non-intrinsic safety circuit provided in the embodiments of the present application with specific embodiments.
Referring to fig. 2, fig. 2 provides a schematic circuit structure diagram of an isolation device of a first intrinsic safety circuit and a non-intrinsic safety circuit in an embodiment of the present application, including:
the radio frequency signal transmission unit and 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 a radio frequency wire and used for transmitting a radio frequency signal and blocking a direct current signal;
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 the intrinsic safety circuit and the non-intrinsic safety circuit and used for providing a loop path for a radio frequency signal and blocking a direct current loop.
The isolating device is positioned between the intrinsic safety circuit and the non-intrinsic safety circuit and is respectively communicated with the intrinsic safety circuit and the non-intrinsic safety circuit, the intrinsic safety circuit and the non-intrinsic safety circuit are isolated from each other, and the intrinsic safety circuit and the non-intrinsic safety circuit can transmit radio frequency signals under the condition that the intrinsic safety circuit and the non-intrinsic safety circuit are not communicated with each other. In this embodiment, the isolation device may be an isolation circuit, and the isolation circuit has a radio frequency trace and a ground plane (also referred to as a ground loop), where the radio frequency trace is used to transmit a radio frequency signal, and the ground plane is respectively communicated with GND (ground) in the intrinsic safety circuit and the non-intrinsic safety circuit, so as to form a ground loop between the intrinsic safety circuit and the non-intrinsic safety circuit, and provide a loop path for transmission of the radio frequency signal.
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 includes at least two capacitors, for example, two, three, or four capacitors; the capacitors in the rf signal transmission unit are connected to each other, and specifically, the rf signal transmission unit is located in the rf trace of the isolation circuit, and the capacitors in the rf signal transmission unit are connected in series, that is, the capacitors in the rf signal transmission unit are connected in series in the rf trace 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, the capacitors connected in series in the radio frequency signal transmission unit enable 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 radio frequency signal transmission process.
The isolation circuit also comprises one or more radio frequency signal loop units, and the radio frequency signal loop units are the other 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, where 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, and 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 capacitors in the same radio frequency signal loop unit are connected in series, namely all 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 can block the direct current loop, prevent the transmission of the direct current signal and isolate the direct current signal while providing loop paths for the radio frequency signal.
As can be seen from the above, in the isolating device for the intrinsic safety circuit and the non-intrinsic safety circuit provided in the embodiment of the present application, the radio frequency signal transmission unit including at least two capacitors is used to transmit the radio frequency signal and block the direct current signal, and then the plurality of radio frequency signal loop units including at least two capacitors are used to provide a loop path for the radio frequency signal and block the direct current loop, so that the isolating device is not affected by the direct current signal during the transmission of the radio frequency signal, 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 the 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.
In an embodiment of the present application, referring to fig. 3a, fig. 3a is a schematic circuit structure diagram of an isolation device of a second intrinsic safety circuit and a non-intrinsic safety circuit in the embodiment of the present application, where the isolation device further includes:
each current limiting unit comprises at least one resistor, the resistors in the same current limiting unit are connected in series, and the current limiting unit is connected with the radio frequency wiring and the ground loop in series.
As mentioned above, 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 is located in the same circuit as the rf signal transmission unit and the rf signal loop unit, and the three units are communicated with each other. The radio frequency signal transmission unit is positioned in a radio frequency wire of the isolation circuit, the radio frequency signal loop unit is positioned in a ground loop between the intrinsic safety circuit and the non-intrinsic safety circuit, and the current limiting unit is positioned between the radio frequency wire and the ground loop and is connected with the radio frequency wire 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 isolating device, all resistors in the same current limiting unit are 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 have faults, the fault conduction of the capacitors can instantly generate pulse energy in the isolation device, and the current limiting unit can limit the current in the isolation circuit, so that the pulse energy is buffered.
Therefore, the isolating device of the intrinsic safety circuit and the non-intrinsic safety circuit provided by the embodiment of the application has the advantages that the current limiting unit comprising at least one resistor is connected in series with the radio frequency wiring and the ground loop, the current of the loop in the isolating device can be limited, and when the capacitors in the radio frequency signal transmission unit and the radio frequency signal loop unit in the isolating device are conducted in a fault mode, the risk of the fault of the loop of the isolating device is reduced.
In one embodiment of the present application, referring to fig. 3b, a schematic circuit structure diagram of an isolation device of a third intrinsic safety circuit and a non-intrinsic safety circuit in the embodiment of the present application is provided. The isolating device can comprise a plurality of current limiting units, and each current limiting unit is connected in parallel, namely, each resistor in the same current limiting unit is connected in series and then connected in parallel with other current limiting units. And all the current limiting units are connected in parallel and then connected in series between the radio frequency wiring and the ground loop.
In the embodiment of the application, all the current limiting units are connected in parallel and then connected in series between the radio frequency wiring and the ground loop, so that even if a single current limiting unit fails, other current limiting units can still work normally, and the safety of the isolating 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, a schematic plan view of the printed circuit board is provided, and 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 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 for each electronic component in practical application of a circuit, and is used for electrically connecting each electronic component in the isolating device. The isolation device may be printed in the printed circuit board by electronic printing.
The isolating 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 communicated with the radio frequency signal loop unit in the bottom layer through a dielectric layer of the printed circuit board, so that the isolation device integrally forms a closed loop.
In one example, the rf signal transmitting unit may be located directly above the rf signal loop unit.
Therefore, when the isolating 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 is communicated with the bottom layer 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 implementation 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 isolation device in a printed circuit board, the second 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 positioned in the top layer, and other radio frequency signal loop units are positioned in the bottom layer.
The isolating 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, the top layer is connected with the current limiting unit and the radio frequency signal transmission unit, and other radio frequency signal loop units are positioned on the bottom layer of the printed circuit board. Fig. 5 illustrates two rf signal loop units, wherein one rf signal loop unit is located in the top layer and in the ground loop between the intrinsic safety circuit and the non-intrinsic safety circuit; a 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 isolator is formed as a closed loop.
It can be seen from the above that, the isolating device for an intrinsically safe circuit and a non-intrinsically safe circuit provided in the embodiments of the present application includes at least two radio frequency signal loop units, a current limiting unit and a radio frequency signal transmission unit, when the isolating device is located in a printed circuit board, the current limiting unit and the radio frequency signal transmission unit are located on a top layer of the printed circuit board, at least one radio frequency signal loop unit is located 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 located on a bottom layer of the printed circuit board and are communicated with the loop units in the top layer through a dielectric layer of the printed circuit board. The isolating device with a richer structure is printed on the printed circuit board, and the loops of the top layer and the bottom layer of the printed circuit board can be protected by the radio frequency signal loop unit, so that the usability of the isolating device in practical application is improved, and more operability is provided for the implementation of the isolating 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, the isolation device further comprising: a metal layer; the metal layer is located between two adjacent capacitors in the radio frequency signal loop unit.
The metal layer is made of conductive materials, is positioned between two adjacent capacitors in the radio frequency signal loop unit and is 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 formed of an aluminum foil, a copper foil layer, a silver foil layer, or the like.
In an embodiment of the present application, a width of a metal layer between two adjacent capacitors in the rf signal loop unit is greater than a width of a gap between the two capacitors.
It can be seen from above that, the isolating device of this ampere of circuit and non-ampere of circuit that this application embodiment provided still includes the metal level, and the metal level can be the copper foil layer for connect two adjacent electric capacities in the bottom radio frequency signal return circuit unit, guarantee simultaneously that the radio frequency between the electric capacity in the top radio frequency signal transmission unit walks the integrality of line structure, reduces radio frequency signal's transmission loss, thereby makes radio frequency signal can effectively and transmit high-efficiently in the isolating circuit who is arranged in 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 be capable of filling the gap between the two capacitors, the transmission loss of the radio frequency signal can be further reduced, and the radio frequency signal 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 located between the intrinsically safe circuit and the non-intrinsically safe 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 materials. The top layer insulating layer structure is located in the top layer of the printed circuit board where the isolating device is located, located between the intrinsic safety circuit and the non-intrinsic safety circuit and used for isolating the intrinsic safety circuit and the non-intrinsic safety circuit in the physical layer in the top layer of the printed circuit board, and the total width of the top layer 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 is a preset width value, and when the total width of the top insulating layer structure of the printed circuit board is greater 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 located in the top layer of the printed circuit board where the isolation device is located, so the total width D1 of the top layer 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 an embodiment of this application, isolating device still includes bottom insulating layer structure, bottom insulating layer structure sets up in the bottom, and be located this ampere of circuit with between the non-this ampere of circuit, bottom insulating layer structure's total width is greater than and predetermines the second threshold value.
The bottom layer insulating layer structure is a layer structure of insulating materials. As mentioned above, the rf signal loop unit is located in the ground loop between the intrinsic safety circuit and the non-intrinsic safety circuit, and only the rf signal loop unit is located in the bottom layer of the printed circuit board where the isolation device is located. And the bottom layer insulating layer structure is positioned in the bottom layer of the printed circuit board where the isolating device is positioned, is positioned 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, and the total width of the bottom layer insulating layer structure can be the distance between the ground planes of the intrinsic safety circuit and 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 insulation layer structures, for example, as shown in fig. 7, D2 and D3 are widths of the two bottom insulation layer structures, respectively, and a layer structure between the two bottom insulation 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 greater than the width value, namely the distance between the ground planes of the intrinsic safety circuit and the non-intrinsic safety circuit is greater than the width value, the intrinsic safety circuit and the non-intrinsic safety circuit can be effectively isolated.
The rf signal loop unit is located at the bottom layer, and the total width (D2+ D3) of the bottom insulating layer structure may be the same as the sum of the widths of the capacitors in the rf signal loop unit.
In one example, the total width of the underlying insulating layer structure may be 6 mm.
It can be seen from above that, this application embodiment provides an isolating device of ann's circuit and non-ann's circuit, through the bottom insulating layer structure in top layer insulating layer structure and the bottom in the printed circuit board's the top layer at isolating device place, carry out the isolation of physical aspect respectively at top layer and bottom to ann's circuit and non-ann's circuit, reduce the risk that dangerous energy hits in the ann's circuit among the non-ann's circuit, improved the security of ann's circuit.
It is noted that, herein, relational terms such as first and second, and the like may be 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. Also, 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 an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only for the preferred embodiment of the present application and is not intended to limit the scope of the present application. Any modification, equivalent replacement, improvement and the like 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 intrinsically safe and non-intrinsically safe circuits, the isolation device comprising: the radio frequency signal transmission unit and 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 a radio frequency wire and used for transmitting a radio frequency signal and blocking a direct current signal;
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 the intrinsic safety circuit and the non-intrinsic safety circuit and used for providing a loop path for a radio frequency signal and blocking a direct current loop.
2. The isolation device of claim 1, further comprising: each current limiting unit comprises at least one resistor, the resistors in the same current limiting unit are connected in series, and the current limiting unit is connected with the radio frequency wiring and the ground loop in series.
3. An isolation device as claimed in claim 2, wherein the isolation device comprises a plurality of said current limiting units, each of which is 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. An isolation device as claimed in claim 4 or 5, further comprising: a metal layer; the metal layer is located between two adjacent capacitors in the radio frequency signal loop unit.
7. The isolation device of claim 6, wherein the metal layer is a copper foil layer.
8. The isolation device of claim 6, wherein the width of the metal layer between two adjacent capacitors in the RF signal loop unit is greater than the width of the gap between the two capacitors.
9. The isolation device of claim 6, further comprising a top layer insulating layer structure disposed in the top layer between the intrinsic safety circuit and the non-intrinsic safety circuit, the top layer insulating layer structure having a total width greater than a predetermined first threshold.
10. The isolation device of claim 6, further comprising an underlying insulating layer structure disposed in the underlying layer between the intrinsic and non-intrinsic circuits, the underlying insulating layer structure having a total width greater than a preset second threshold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| 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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| Application Number | Priority Date | Filing Date | Title |
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| 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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| CN114844519B CN114844519B (en) | 2023-10-10 |
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Citations (18)
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|---|---|
| CN114844519B (en) | 2023-10-10 |
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