CN204886162U - Zener formula guard grating - Google Patents
Zener formula guard grating Download PDFInfo
- Publication number
- CN204886162U CN204886162U CN201520491383.7U CN201520491383U CN204886162U CN 204886162 U CN204886162 U CN 204886162U CN 201520491383 U CN201520491383 U CN 201520491383U CN 204886162 U CN204886162 U CN 204886162U
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- circuit
- current
- limiting
- signalling channel
- guard grating
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- Expired - Fee Related
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Abstract
The utility model provides a zener formula guard grating, includes signalling channel no. 1 and signalling channel no. 2, signalling channel includes current -limiting circuit, voltage stabilizing circuit and the protection circuit of series connection in proper order. Zener formula guard grating, the principle is simple, the circuit is easily realized, low in production cost, available module and installation space still less still less realizes more signal transmission to temperature characteristic is good, and the response is fast, the low -power consumption, and keep apart effectually and the reliability is high.
Description
Technical field
The utility model relates to a kind of guard grating, particularly a kind of Zener type guard grating.
Background technology
Guard grating is connected between intrinsically safe circuit and immaterial safety circuit, by the voltage of supply intrinsically safe circuit or the device of current limit in certain safe range.Existing Zener type guard grating is a road signalling channel is a module, but needs for multiple signal channels for scene, and don't fail to increase module number and just can satisfy the demands, this needs more installing space, makes troubles to installation.
Guard grating is widely used in the industrial instrument front end signal process in the field such as explosion-proof, for raising industrial processes automatic control system antijamming capability, Guarantee control system stability and reliability have very important effect, but current guard grating has the following disadvantages: power consumption is large, poor stability, temperature characterisitic is poor, poor anti jamming capability, output shift is large, easily breaks down; In addition power output is little, and current-limiting resistance is comparatively large, and caloric value is many, and resistance temperature rise is too high; And small product size is comparatively large, is unfavorable for in-site installation.
Utility model content
Utility model object: for overcoming above deficiency, the purpose of this utility model is to provide a kind of Zener type guard grating, and available less module and less installing space realize more Signal transmissions.And this Zener type guard grating isolation effect is good, reliability is high, good temp characteristic, response are fast, low-power consumption, isolating safety grid that production cost is low.
Technical scheme: a kind of Zener type guard grating, comprises signalling channel one and signalling channel two; Described signalling channel one comprises the current-limiting circuit one, voltage stabilizing circuit one and the protective circuit one that are sequentially connected in series; Described current-limiting circuit one comprises current-limiting resistance R1, and described voltage stabilizing circuit one comprises voltage-limiting element VD1, and described protective circuit one comprises fast acting fuse FU1 and current-limiting resistance R2; Described signalling channel two comprises the current-limiting circuit two, voltage stabilizing circuit two and the protective circuit two that are sequentially connected in series; Described current-limiting circuit two comprises current-limiting resistance R3, and described voltage stabilizing circuit two comprises voltage-limiting element VD2, and described protective circuit two comprises fast acting fuse FU2 and current-limiting resistance R4.
Above-mentioned Zener type guard grating, the voltage-limiting element VD1 of described the voltage stabilizing circuit one and voltage-limiting element VD2 of voltage stabilizing circuit two all connects with ground.
Further, above-mentioned Zener type guard grating, described voltage-limiting element is Zener diode or diode.
Further, above-mentioned Zener type guard grating, the output of described current-limiting circuit one is as the port one of signalling channel one; The output of described protective circuit one is as the port three of signalling channel one.
Further, above-mentioned Zener type guard grating, the output of described current-limiting circuit two is as the port two of signalling channel two; The output of described protective circuit two is as the port four of signalling channel two.
Technique scheme can be found out, the utility model has following beneficial effect: Zener type guard grating described in the utility model, and principle is simple, and circuit easily realizes, and production cost is low, and good temp characteristic, response are fast, low-power consumption, isolation effect is good and reliability is high.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of Zener type guard grating described in the utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments, illustrate the utility model further.
Zener type guard grating as shown in Figure 1, comprises signalling channel one and signalling channel two; Described signalling channel one comprises the current-limiting circuit one, voltage stabilizing circuit one and the protective circuit one that are sequentially connected in series; Described current-limiting circuit one comprises current-limiting resistance R1, and described voltage stabilizing circuit one comprises voltage-limiting element VD1, and described protective circuit one comprises fast acting fuse FU1 and current-limiting resistance R2; Described signalling channel two comprises the current-limiting circuit two, voltage stabilizing circuit two and the protective circuit two that are sequentially connected in series; Described current-limiting circuit two comprises current-limiting resistance R3, and described voltage stabilizing circuit two comprises voltage-limiting element VD2, and described protective circuit two comprises fast acting fuse FU2 and current-limiting resistance R4.The output of described current-limiting circuit one is as the port one of signalling channel one; The output of described protective circuit one is as the port three of signalling channel one.The output of described current-limiting circuit two is as the port two of signalling channel two; The output of described protective circuit two is as the port four of signalling channel two.In addition, the voltage-limiting element VD1 of described the voltage stabilizing circuit one and voltage-limiting element VD2 of voltage stabilizing circuit two all connects with ground.In the present embodiment, described voltage-limiting element is Zener diode.
Under normal operating condition, voltage added between hazardous area non-intrinsic safety end port one and port two is lower than maximal pressure Vmax, more lower than the Zener voltage of Zener diode, now VD1 and VD2 is in not on-state, beyond atomic little leakage current, be " open circuit " state, safety barrier circuit is equivalent to a resistant series in signal circuit, as long as leakage current is less than setting, safety barrier circuit can not the normal work of influential system.
When breaking down in hazardous area, such as, because certain reason is mixed into high-tension electricity between hazardous area non-intrinsic safety end port one and port two, make Zener diode VD1 and/or VD2 reverse breakdown, in " conducting " state, now Zener diode VD1 and/or VD2 is limited in the high voltage be mixed in Zener voltage, the intrinsic safety end port three and port four of place of safety there will not be high voltage, Zener diode is once after conducting, its electric current sharply rise (avalanche process) series connection fusible link FU1 and/or FU2 is in circuit fused instantaneously, cut off to on-the-spot high voltage, prevent high voltage from igniting the danger of on-the-spot explosive substance, thus protect the safety of field apparatus and personnel.
When in hazardous area, break down in scene, such as load short circuits, current-limiting resistance R1, R3 in safety barrier circuit play metering function immediately, and short circuit current is limited within certain safety value.
The utility model can realize more Signal transmissions with less module and less installing space, and installing space is also greatly saved, and operation principle is constant simultaneously, can limit equally and enter hazardous area equipment electric flux, play the explosion-proof of hazardous area equipment.
The above is only preferred implementation of the present utility model; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the utility model principle; can also make some improvement, these improvement also should be considered as protection range of the present utility model.
Claims (5)
1. a Zener type guard grating, is characterized in that: comprise signalling channel one and signalling channel two; Described signalling channel one comprises the current-limiting circuit one, voltage stabilizing circuit one and the protective circuit one that are sequentially connected in series; Described current-limiting circuit one comprises current-limiting resistance R1, and described voltage stabilizing circuit one comprises voltage-limiting element VD1, and described protective circuit one comprises fast acting fuse FU1 and current-limiting resistance R2; Described signalling channel two comprises the current-limiting circuit two, voltage stabilizing circuit two and the protective circuit two that are sequentially connected in series; Described current-limiting circuit two comprises current-limiting resistance R3, and described voltage stabilizing circuit two comprises voltage-limiting element VD2, and described protective circuit two comprises fast acting fuse FU2 and current-limiting resistance R4.
2. Zener type guard grating according to claim 1, is characterized in that: the voltage-limiting element VD1 of described the voltage stabilizing circuit one and voltage-limiting element VD2 of voltage stabilizing circuit two all connects with ground.
3. Zener type guard grating according to claim 1 and 2, is characterized in that: described voltage-limiting element is Zener diode.
4. Zener type guard grating according to claim 1, is characterized in that: the output of described current-limiting circuit one is as the port one of signalling channel one; The output of described protective circuit one is as the port three of signalling channel one.
5. Zener type guard grating according to claim 1, is characterized in that: the output of described current-limiting circuit two is as the port two of signalling channel two; The output of described protective circuit two is as the port four of signalling channel two.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520491383.7U CN204886162U (en) | 2015-07-09 | 2015-07-09 | Zener formula guard grating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520491383.7U CN204886162U (en) | 2015-07-09 | 2015-07-09 | Zener formula guard grating |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204886162U true CN204886162U (en) | 2015-12-16 |
Family
ID=54830494
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520491383.7U Expired - Fee Related CN204886162U (en) | 2015-07-09 | 2015-07-09 | Zener formula guard grating |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204886162U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110265969A (en) * | 2019-07-25 | 2019-09-20 | 重庆光可巡科技有限公司 | A kind of ia type power safety grid circuit of dual-protection circuit |
-
2015
- 2015-07-09 CN CN201520491383.7U patent/CN204886162U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110265969A (en) * | 2019-07-25 | 2019-09-20 | 重庆光可巡科技有限公司 | A kind of ia type power safety grid circuit of dual-protection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: No. 9 East Road in Kunshan City Qiandeng Town, Suzhou City, Jiangsu province 215300 Patentee after: The Suzhou times jia'an explosion-proof electricity limited company Address before: No. 9 East Road in Kunshan City Qiandeng Town, Suzhou City, Jiangsu province 215300 Patentee before: Suzhou Beijiafu Explosion-proof Electrical Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151216 Termination date: 20180709 |