CN210669524U - Intrinsic safety voltage limiting device of electronic unit - Google Patents
Intrinsic safety voltage limiting device of electronic unit Download PDFInfo
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- CN210669524U CN210669524U CN201921722502.XU CN201921722502U CN210669524U CN 210669524 U CN210669524 U CN 210669524U CN 201921722502 U CN201921722502 U CN 201921722502U CN 210669524 U CN210669524 U CN 210669524U
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- limiting device
- electrode circuit
- voltage limiting
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Abstract
The utility model discloses an intrinsically safe voltage limiting device of electronic unit relates to the automation instrument field, including guard electrode circuit and measuring electrode circuit, the guard electrode circuit sets up with the electronic signal synchronization of measuring electrode circuit, the guard electrode circuit is including the protective sheath input that connects gradually, first safety device, first current limiting device with connect probe protective sheath output, the measuring electrode circuit is including the ACT measurement input that connects gradually, the second safety device, the second current limiting device with connect probe measuring end output, be connected with earthing device through two-way intrinsically safe flame proof voltage limiting device between guard electrode circuit and the measuring electrode circuit, still include two-way clamper voltage limiting device on guard electrode circuit and the measuring electrode circuit. The utility model discloses have and set up two-way clamper voltage limiting device through setting up on the two-way intrinsic safety flame proof voltage limiting device between measuring electrode circuit and guard electrode circuit, both satisfied complete machine explosion-proof requirement, can not influence the effect of instrument performance itself again.
Description
Technical Field
The utility model relates to an automatic change instrument technical field, more specifically say, it relates to electronic unit's intrinsic safe voltage limiting device.
Background
The automatic instrument is an automatic technical tool which is composed of a plurality of automatic elements and has more perfect functions. The automation meter is a system and a subsystem in the whole automation system. An automation device is an "information machine" whose main function is to convert the form of information from an input signal to an output signal. Some instruments are provided with a bidirectional intrinsic safety explosion-proof pressure limiting device. Referring to fig. 1, when the conventional bidirectional intrinsically safe explosion-proof and voltage-limiting device is connected to a measuring electrode of an instrument, the device can play the roles of explosion prevention and voltage limitation.
Because the instrument in this scheme needs two-way ann's flame proof voltage limiting device, therefore when conventional ann's flame proof voltage limiting device was connected to this instrument's measuring electrode, measuring electrode can be because the load mismatch and can't normally work. As is known, explosion proof isolation requires that there be several outputs from the electronics and there will be several corresponding isolation modules. Referring to fig. 1, the instrument in the scheme has two paths of electronic signals to be output to the probe, so two paths of isolation modules are needed, the probe ACT is a high-sensitivity micro-electrical signal measuring device, when a conventional explosion-proof isolation device is directly connected to an ACT measuring end, the instrument is in a short-circuit state, namely, the distributed capacitance load is too heavy, so that the instrument cannot normally work, the input end of a protective sleeve line does not participate in measurement, the instrument cannot normally work due to the influence, but the whole instrument must meet explosion-proof requirements, otherwise, the requirement of explosion-proof grade regulation cannot be met.
Based on the above problems, we have designed an intrinsically safe voltage limiting device for an electronic unit to solve the above problems.
SUMMERY OF THE UTILITY MODEL
To this problem in the in-service use, the utility model aims to provide an intrinsically safe voltage limiting device of electronic unit through set up two-way clamper voltage limiting device on the two-way intrinsically safe flame proof voltage limiting device between measuring electrode circuit and guard electrode circuit, has both satisfied complete machine explosion-proof requirement, can not influence the performance of instrument itself again, and concrete scheme is as follows:
the intrinsic safety voltage limiting device of the electronic unit comprises a protective electrode circuit and a measuring electrode circuit, wherein the protective electrode circuit and an electronic signal of the measuring electrode circuit are synchronously arranged, the protective electrode circuit comprises a protective sleeve input end, a first safety device, a first current limiting device and a probe connecting protective sleeve output end which are sequentially connected, the measuring electrode circuit comprises an ACT measuring input end, a second safety device, a second current limiting device and a probe connecting measuring end output end which are sequentially connected, the protective electrode circuit and the measuring electrode circuit are connected with a grounding device through a bidirectional intrinsic safety explosion-proof voltage limiting device,
the protection electrode circuit and the measuring electrode circuit further comprise a bidirectional clamping voltage limiting device, the bidirectional clamping voltage limiting device is respectively connected with the protection electrode circuit and the measuring electrode circuit so as to realize that the protection electrode circuit and the measuring electrode circuit share a double-circuit synchronous circuit, and the bidirectional clamping voltage limiting device is used for limiting the maximum voltage on the measuring electrode circuit.
According to the technical scheme, the bidirectional intrinsic safety explosion-proof and pressure-limiting device of the measuring electrode circuit is connected to the bidirectional intrinsic safety explosion-proof and pressure-limiting device of the protective sleeve through the bidirectional clamping pressure-limiting device, so that the probe is not influenced by the bidirectional intrinsic safety explosion-proof and pressure-limiting device when working, and is still controlled by the bidirectional intrinsic safety explosion-proof and pressure-limiting device, the technical requirements of the bidirectional intrinsic safety explosion-proof and pressure-limiting device are met, and the probe influenced by the conventional bidirectional intrinsic safety explosion-proof and pressure-limiting device can be normally used in the occasions meeting the explosion-proof requirements on the whole.
Furthermore, the bidirectional clamping voltage limiting device adopts a bidirectional high-frequency clamping diode.
Through the technical scheme, the distributed capacitance load of the bidirectional high-frequency clamping diode is very light, so that the influence on a circuit is reduced to the greatest extent.
Furthermore, two groups of the bidirectional intrinsic safety explosion-proof and voltage-limiting devices and the grounding device are arranged, and the bidirectional clamping and voltage-limiting device is arranged between the two groups of the bidirectional intrinsic safety explosion-proof and voltage-limiting devices.
Furthermore, the bidirectional intrinsic safety explosion-proof voltage limiting device is used for limiting the maximum voltage of the protective electrode circuit.
Further, the first safety device and the first current limiting device are both used for limiting the current of the protection electrode circuit.
Furthermore, the second safety device and the second current limiting device are both used for limiting the current of the measuring electrode line.
Compared with the prior art, the beneficial effects of the utility model are as follows: the utility model discloses in, through set up two-way clamper voltage limiting device on the two-way ann flame proof voltage limiting device at protection motor circuit and measuring electrode circuit, high frequency clamp diode through high impedance with probe signal clamp in the two-way ann flame proof voltage limiting device that accords with explosion-proof requirement, because high frequency clamp diode's distribution electric capacity load is very light, the signal of two sets of circuits is synchronous, two sets of circuits realize sharing a double-circuit synchronization line that accords with the requirement, both satisfy the requirement of explosion-proof authentication, can not influence the performance of instrument itself again, reach perfect combination between them.
Drawings
FIG. 1 is a flow chart of a conventional intrinsic safety voltage limiting device in the prior art;
fig. 2 is a flow chart of the intrinsic safety pressure limiting device of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following examples and drawings, but the embodiments of the present invention are not limited thereto.
As shown in figure 2, the intrinsic safety voltage limiting device of the electronic unit comprises a protective electrode circuit 1 and a measuring electrode circuit 2, the protective electrode circuit 1 and the electronic signal of the measuring electrode circuit 2 are synchronously arranged, the protective electrode circuit 1 comprises a protective sleeve input end 11, a first safety device 12, a first current limiting device 13 and a probe connecting protective sleeve output end 14 which are sequentially connected, the measuring electrode circuit 2 comprises an ACT measuring input end 21, a second safety device 22, a second current limiting device 23 and a probe connecting measuring output end 24 which are sequentially connected, the protective electrode circuit 1 and the measuring electrode circuit 2 are connected with a grounding device 4 through a bidirectional intrinsic safety explosion-proof voltage limiting device 3, the protective electrode circuit 1 and the measuring electrode circuit 2 further comprise a bidirectional clamping voltage limiting device 5, the bidirectional clamping voltage limiting device 5 is respectively connected with the protective electrode circuit 1 and the measuring electrode circuit 2, so as to realize that the protective electrode circuit 1 and the measuring electrode circuit 2 share a double-circuit synchronous circuit, and the bidirectional clamping voltage-limiting device 5 is used for limiting the maximum voltage on the measuring electrode circuit 2. Optionally, the bidirectional clamping voltage limiting device 5 is configured as a high frequency clamping diode. Therefore, the bidirectional intrinsic safety explosion-proof and pressure-limiting device 3 of the measuring electrode circuit 2 is connected to the bidirectional intrinsic safety explosion-proof and pressure-limiting device 3 of the protective sleeve through the bidirectional clamping pressure-limiting device 5, so that the probe is not influenced by the bidirectional intrinsic safety explosion-proof and pressure-limiting device 3 when working, and is still controlled by the bidirectional intrinsic safety explosion-proof and pressure-limiting device 3, the technical requirements of the bidirectional intrinsic safety explosion-proof and pressure-limiting device 3 are met, the probe influenced by the conventional bidirectional intrinsic safety explosion-proof and pressure-limiting device 3 can be normally used on occasions meeting the explosion-proof requirements as a whole, and the influence on the circuit is reduced to the maximum extent due to the fact that the distributed capacitance load of the bidirectional clamping high-frequency diode is very light.
The two-way intrinsic safety explosion-proof voltage limiting devices 3 and the grounding device 4 are arranged in two groups, and the two-way clamping voltage limiting device 5 is arranged between the two groups of two-way intrinsic safety explosion-proof voltage limiting devices 3.
The bidirectional intrinsic safety explosion-proof voltage limiting device 3 is used for limiting the maximum voltage of the protective electrode circuit 1.
The first safety device 12 and the first current limiting device 13 are both used to limit the current of the guard electrode line 1.
The second safety device 22 and the second current limiting device 23 are both used to limit the current of the measuring electrode line 2.
The utility model discloses a concrete implementation principle does: two groups of bidirectional intrinsic safety explosion-proof pressure-limiting devices 3 are arranged on a protective electrode circuit 1 and a measuring electrode circuit 2, when the conventional bidirectional intrinsic safety explosion-proof pressure-limiting devices 3 are directly connected to an ACT measuring input end 21, due to the distributed capacitance load process of the bidirectional intrinsic safety explosion-proof pressure-limiting devices 3, the instrument is in a short circuit state and cannot normally work, the protective electrode circuit 1 does not participate in measurement and is not influenced by the measurement, but can normally work, but the whole instrument cannot meet the explosion-proof requirement, therefore, a bidirectional clamping pressure-limiting device 5 is arranged between the two groups of bidirectional intrinsic safety explosion-proof pressure-limiting devices 3 on the two circuits, a probe signal is clamped in the pressure-limiting device meeting the explosion-proof requirement through a high-impedance high-frequency clamping diode, the two circuits share a two-way synchronous circuit meeting the requirement to achieve the certification requirement, the explosion-proof requirement of a micro-signal measuring probe is connected into the protective, the requirements of explosion-proof certification of the whole instrument are met, the performance of the instrument is not influenced, and the perfect combination of the two is achieved.
It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (6)
1. The intrinsic safety voltage limiting device of the electronic unit is characterized by comprising a protective electrode circuit (1) and a measuring electrode circuit (2), wherein the protective electrode circuit (1) and an electronic signal of the measuring electrode circuit (2) are synchronously arranged, the protective electrode circuit (1) comprises a protective sleeve input end (11), a first safety device (12), a first current limiting device (13) and a probe connecting protective sleeve output end (14) which are sequentially connected, the measuring electrode circuit (2) comprises an ACT measuring input end (21), a second safety device (22), a second current limiting device (23) and a probe connecting measuring output end (24) which are sequentially connected, the protective electrode circuit (1) and the measuring electrode circuit (2) are connected with a grounding device (4) through a bidirectional intrinsic safety explosion-proof voltage limiting device (3),
the protection electrode circuit (1) and the measurement electrode circuit (2) further comprise a bidirectional clamping voltage limiting device (5), the bidirectional clamping voltage limiting device (5) is respectively connected with the protection electrode circuit (1) and the measurement electrode circuit (2) to realize that the protection electrode circuit (1) and the measurement electrode circuit (2) share a double-circuit synchronous circuit, and the bidirectional clamping voltage limiting device (5) is used for limiting the maximum voltage on the measurement electrode circuit (2).
2. Intrinsic safety voltage limiting device of an electronic unit according to claim 1 characterized in that the bidirectional clamping voltage limiting device (5) employs bidirectional high frequency clamping diodes.
3. The intrinsically safe voltage limiting device of an electronic unit according to claim 1, wherein two groups of bidirectional intrinsically safe flameproof voltage limiting devices (3) and the grounding device (4) are arranged, and the bidirectional clamping voltage limiting device (5) is arranged between the two groups of bidirectional intrinsically safe flameproof voltage limiting devices (3).
4. An intrinsically safe voltage limiting device of an electronic unit according to claim 3, characterized in that the bidirectional intrinsically safe flameproof voltage limiting device (3) is used to limit the maximum voltage of the guard electrode line (1).
5. Intrinsic safety voltage limiting device of an electronic unit according to claim 1, characterized in that the first safety device (12) and the first current limiting device (13) are both used to limit the current of the protection electrode line (1).
6. Intrinsic safety voltage limiting device of an electronic unit according to claim 1, characterized in that the second safety device (22) and the second current limiting device (23) are both used to limit the current of the measuring electrode line (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921722502.XU CN210669524U (en) | 2019-10-11 | 2019-10-11 | Intrinsic safety voltage limiting device of electronic unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921722502.XU CN210669524U (en) | 2019-10-11 | 2019-10-11 | Intrinsic safety voltage limiting device of electronic unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210669524U true CN210669524U (en) | 2020-06-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921722502.XU Active CN210669524U (en) | 2019-10-11 | 2019-10-11 | Intrinsic safety voltage limiting device of electronic unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210669524U (en) |
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2019
- 2019-10-11 CN CN201921722502.XU patent/CN210669524U/en active Active
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