CN101582587A - Guard grating - Google Patents
Guard grating Download PDFInfo
- Publication number
- CN101582587A CN101582587A CNA2008101917154A CN200810191715A CN101582587A CN 101582587 A CN101582587 A CN 101582587A CN A2008101917154 A CNA2008101917154 A CN A2008101917154A CN 200810191715 A CN200810191715 A CN 200810191715A CN 101582587 A CN101582587 A CN 101582587A
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- guard grating
- zener
- parallel
- adjustment control
- triode
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Abstract
The invention discloses a guard grating, which comprises a fuse wire Fs, a zener D1 and automatic adjustment control units, wherein the fuse wire is connected in series with at least one automatic adjustment control unit and is then connected with a load of a dangerous area, and the zener is connected in parallel with the load of the dangerous area; and the automatic adjustment control unit comprises a triode T1 playing a role in adjustment, a triode T3 and a voltage dividing resistor Ro1, the emitter current output of the T1 is shunted to base electrode of the T3, and an emitter junction of the T3 is connected in parallel with the Ro1. The guard grating achieves stable voltage output by using a comparatively small resistor, and compared with the structure of the prior guard grating, the power consumption on the voltage dividing resistor is small, the heat productivity is also small, the service life of the guard grating is prolonged, and simultaneously, the guard grating can increase the output power, is simple and practical, and has good reliability.
Description
Technical field
The present invention relates to a kind of guard grating, a kind of specifically attachment security district and hazardous area equipment.
Background technology
Zena's safety barrier can equipment (associate device) as a kind of limit, can safe attachment security district and hazardous area equipment, and according to GB GB3836.1, GB3836.2, GB3836.4 requirement, guard grating must be used with being connected of hazardous area intrinsic safety equipment in the place of safety.
The tradition zena's safety barrier adopts fuse to connect with current-limiting resistance, and output is in parallel with zener, and zener plays the effect of voltage stabilizing, and because of employed current-limiting resistance resistance is bigger, cause practical application following problem to occur: 1, power output is little; 2, current-limiting resistance is bigger, and caloric value is many, and the resistance temperature rise is too high; 3, small product size is bigger, is unfavorable for on-the-spot the installation.
Summary of the invention
The purpose of this invention is to provide a kind of guard grating, solve the problem that the excessive heating that causes of resistance is many, temperature rise is big that guard grating commonly used exists.
The objective of the invention is to be achieved through the following technical solutions:
A kind of guard grating comprises fuse Fs, zener D1, and described zener is in parallel with the hazardous area load; Also comprise at least one adjustment control unit automatically, connect with fuse and hazardous area load;
Described automatic adjustment control unit comprises:
A triode T1 and a triode T3, the emitter of T1 is connected with the base stage of T3, and the base stage of T1 is connected with the collector electrode of T3;
A resistance R 1, collector electrode and the base stage of connection T1;
With a divider resistance Ro1, in parallel with the T3 emitter junction;
Also comprise a zener D2, in parallel with D1.
The present invention has realized having realized stable voltage output with a less relatively resistance that compare with original guard grating structure, the power that consumes is little on divider resistance, caloric value is also little, prolong the useful life of guard grating, can increase power output, simple and practical, good reliability simultaneously.
Description of drawings
With embodiment the present invention is described in further detail with reference to the accompanying drawings below.
Fig. 1 is the circuit structure diagram of the guard grating used always;
Fig. 2 is the circuit structure diagram of guard grating of the present invention.
Embodiment
The circuit structure diagram that Fig. 1 adopts for guard grating commonly used, Ro is a current-limiting resistance, and D0 is a Zener diode, the input voltage of Vi place of safety, Vo is the hazardous area output voltage, and Ro exports the intrinsic safety equipment that Vo supplies with the danger district again with after the voltage stabilizing of D0 zener by the series connection of Fs fuse.D0 plays the effect of voltage stabilizing, and D0 is stabilized in Vo the level of regulation.Because of employed current-limiting resistance resistance is bigger, cause practical application following problem to occur: 1, power output is little; 2, current-limiting resistance is bigger, and caloric value is many, and the resistance temperature rise is too high; 3, small product size is bigger, is unfavorable for on-the-spot the installation.
As shown in Figure 2, guard grating of the present invention comprises fuse Fs, zener D1 and adjusts control unit automatically, is in the circuit diagram shown in the frame of broken lines, fuse is adjusted control unit series connection back automatically with at least one and is connected with the load in hazardous area, and described zener is in parallel with the hazardous area load; Described automatic adjustment control unit comprises triode T1, the triode T3 and the divider resistance Ro1 that play corrective action, and the emitter current output steering of T1 is to the base stage of T3, and the T3 emitter junction is in parallel with Ro1.
T3 emitter junction voltage Vbe=0.5V, the current-limiting resistance both end voltage is limited to 0.5 a right left side by Vbe, and its pressure drop is very low, compares the conventional security grid, and output same current power consumption, resistance value reduce greatly.Principle describes in detail: T1 is for adjusting pipe, input voltage Vi makes the pipe T1 work of adjusting through fuse Fs, R1, the T3 conducting, make current-limiting resistance Ro1 both end voltage be limited at Vbe=0.5V, when R01=1 Ω, maximum exportable Vbe/Ro1 ≈ 0.5A, adjust pipe T1 largest tube pressure drop Vce ≈ 1.3V, input voltage Vi minimum is: Vi ≈ Vo+4, promptly operate as normal has the pressure reduction of 4V between Vi and Vo, than the easier design of conventional security grid.
Preferably, except that D1, also be provided with the D2 of a parallel connection, can guarantee that like this another also plays pressure stabilization function when having one to damage in the middle of D1, the D2.During two voltage-stabiliser tube parallel operations, reduce the power consumption of single voltage-stabiliser tube, improved the security performance of circuit.
Zena's safety barrier can equipment (associate device) as a kind of limit, can safe attachment security district and hazardous area equipment, and according to GB GB3836.1, GB3836.2, GB3836.4 requirement, guard grating must be used with being connected of hazardous area intrinsic safety equipment in the place of safety.
Intrinsic safety equipment described in the present invention is, the equipment that any electric spark that (fault condition that comprises operate as normal and regulation) produces down under the condition of GB3826.4 standard code or any thermal effect all can not be lighted the explosion gas environment of regulation.
The hazardous area is, the area dividing of hazardous area: China, Europe, IEC and North America are carried out area dividing to the hazardous area classification and are described.Specifically be expressed as follows:
Claims (2)
1, a kind of guard grating comprises fuse Fs, zener D1, and described zener is in parallel with the hazardous area load; It is characterized in that, also comprise at least one adjustment control unit automatically, connect with fuse and hazardous area load;
Described automatic adjustment control unit comprises:
A triode T1 and a triode T3, the emitter of T1 is connected with the base stage of T3, and the base stage of T1 is connected with the collector electrode of T3;
A resistance R 1, collector electrode and the base stage of connection T1;
With a divider resistance Ro1, in parallel with the T3 emitter junction.
2, guard grating according to claim 1 is characterized in that, also comprises a zener D2, and is in parallel with D1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101917154A CN101582587A (en) | 2008-12-30 | 2008-12-30 | Guard grating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101917154A CN101582587A (en) | 2008-12-30 | 2008-12-30 | Guard grating |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101582587A true CN101582587A (en) | 2009-11-18 |
Family
ID=41364603
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008101917154A Pending CN101582587A (en) | 2008-12-30 | 2008-12-30 | Guard grating |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101582587A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103259248A (en) * | 2013-04-18 | 2013-08-21 | 北京中科思鹏科技有限公司 | Safety grid |
| CN105790207A (en) * | 2016-05-20 | 2016-07-20 | 中国矿业大学 | High-power cut-off type safety barrier |
| 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 |
-
2008
- 2008-12-30 CN CNA2008101917154A patent/CN101582587A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103259248A (en) * | 2013-04-18 | 2013-08-21 | 北京中科思鹏科技有限公司 | Safety grid |
| CN105790207A (en) * | 2016-05-20 | 2016-07-20 | 中国矿业大学 | High-power cut-off type safety barrier |
| 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 |
| CN110265969B (en) * | 2019-07-25 | 2021-06-29 | 重庆光可巡科技有限公司 | Ia type power supply safety barrier circuit of double protection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20091118 |