CN203607833U - An explosion-proof electric device - Google Patents
An explosion-proof electric device Download PDFInfo
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- CN203607833U CN203607833U CN201320666238.9U CN201320666238U CN203607833U CN 203607833 U CN203607833 U CN 203607833U CN 201320666238 U CN201320666238 U CN 201320666238U CN 203607833 U CN203607833 U CN 203607833U
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- 239000002360 explosive Substances 0.000 claims description 29
- 230000000087 stabilizing effect Effects 0.000 claims description 11
- 239000003990 capacitor Substances 0.000 abstract description 38
- 230000005855 radiation Effects 0.000 abstract description 8
- 238000004880 explosion Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 239000000428 dust Substances 0.000 description 4
- 238000005538 encapsulation Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 235000013312 flour Nutrition 0.000 description 2
- 231100001261 hazardous Toxicity 0.000 description 2
- 230000001012 protector Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010892 electric spark Methods 0.000 description 1
- -1 mine Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model discloses an explosion-proof electric device. The explosion-proof electric device comprises a first device arranged in a safety area and a second device exposed in a dangerous area. The first device and the second device are connected through at least one data line. Base pins, as signal inputs, on the first device and / or the second device are connected to the ground via a capacitor; each data line is provided with an intrinsic safety circuit; and each intrinsic safety circuit comprises a current-limiting resistor connected between the base pin of the first device and the base pin of the second device and a capacitor bank, of which the capacitance value is greater than the above capacitor for 2.4 times, and the capacitor bank is in parallel connection with the current-limiting resistor. Through the enforcement of the technical scheme of the utility model, driving currents on the at least one data line are enlarged, and the radiation resistance performance is enhanced; furthermore, even if the speeds of communication interfaces of the two devices are very high, the explosion-proof electric device can work normally.
Description
Technical field
The utility model relates to circuit protection field, especially relates to a kind of electrical apparatus for explosive atmospheres.
Background technology
Essential safety is a kind of type of explosion proof construc tion of electric equipment, and device interior and the issuable electric spark of connection wire or the thermal effect energy limited that are exposed to potential explosive atmosphere can not produced the level of lighting by it.
Having in the hazardous environment of damp or dust, such as mine, oil field, flour mill etc., the electric/electronic device using must have certain fail safe, under rated condition, can not light imflammable gas or dust.How guaranteeing the fail safe of equipment in these hazardous environments, is the content that Explosion-proof Design will be studied.
The principle of essential safety instrument is by the voltage of limiting circuit or electric current, makes spark or instrumentation table surface temperature that instrument produces under various possible fault conditions be not enough to light damp or dust.
More common mode is to adopt the mode of series limiting resistor to carry out the electric current of entry/exit deathtrap, limiting circuit upper reaches.For example; at DMR(Digital Mobile Radio; digital mobile radio) in anti-explosion talkback machine; as shown in Figure 1; most of circuit (comprising controller) on mainboard is isolated from the outside out by protection devices such as current-limiting resistances; and conductively-closed cover cap is lived; and in radome, having filled silica gel produces to prevent spark; therefore in safety zone; controller in safety zone drives the display screen outside mainboard, and this display screen is connected to the controller on mainboard by board to board connector (not shown).Connector and display screen are exposed in air; cause the spark of macro-energy in order to prevent from being exposed to device short circuit on hard contact or the display screen of the connector in damp under fault condition, the 1.1K Ω current-limiting resistance of one 0603 encapsulation (1.6mm*0.8mm) of just having connected on the data wire that carries out transfer of data between controller and display screen is as explosive-proof protector device.Because it is very many that current-limiting resistance uses; in the spacing safety that guarantees current-limiting resistance two-end-point (according to explosion-proof criteria; the for example table 5 of " GB3836.4-2010 explosive atmosphere the 4th part: by the equipment of essential safe type " i " protection "; the lead pin pitch of explosive-proof protector device will meet safe distance and require) time; also to reduce the size of current-limiting resistance (because be hand transceiver; very large to spatial limitation), therefore current-limiting resistance can only use 0603 encapsulation.In addition, current-limiting resistance can bear again circuit and under fault, impose on its power, so can only select the resistance of 1.1K Ω.
But the shortcoming of this protective circuit is that the current-limiting resistance of the large resistance of connecting on data wire dies down driving force, shows as:
1) when display screen brush screen, if near have powerful radio-frequency radiation, can on data wire, produce little electric current, affect controller and export the data-signal of display screen to, thereby cause display screen can spend screen, picture is abnormal;
2) in the time that the output signal of controller occurs that level changes, due to the impact of the current-limiting resistance of resistance greatly, the level of the input signal of display screen change very slowly, as shown in Figure 2, in the time uprising level from low level, the rise time is 240ns, and when from high level step-down level, be 216ns fall time.Like this, if signal frequency is too high, LCD cannot normally show.
Utility model content
The technical problems to be solved in the utility model is, the defect that the driving force causing for the above-mentioned current-limiting resistance of prior art is excessively weak, provides the electrical apparatus for explosive atmospheres that a kind of driving force is stronger.
The utility model solves the technical scheme that its technical problem adopts: construct a kind of electrical apparatus for explosive atmospheres, comprise the first device being arranged in safety zone, be exposed to the second device in deathtrap, described the first device is connected by least one data wire with described the second device, and, between the pin of inputting as signal on described the first device and/or the second device and ground, be connected with electric capacity, on each data wire, be provided with intrinsically safe circuit, described intrinsically safe circuit comprises that the current-limiting resistance that is connected between the pin of described the first device and the pin of described the second device and capacitance are greater than the capacitance group of 2.4 times of the capacitances of described electric capacity, and, described capacitance group is in parallel with described current-limiting resistance.
In electrical apparatus for explosive atmospheres described in the utility model, described capacitance group comprises the first electric capacity, and described the first electric capacity is in parallel with described current-limiting resistance.
In electrical apparatus for explosive atmospheres described in the utility model, described capacitance group comprises the second electric capacity and the 3rd electric capacity that are in series, in parallel with described current-limiting resistance after described the second electric capacity and described the 3rd capacitances in series.
In electrical apparatus for explosive atmospheres described in the utility model, described capacitance group comprises the 4th electric capacity, the 5th electric capacity and the 6th electric capacity that are in series, in parallel with described current-limiting resistance after described the 4th electric capacity, the 5th electric capacity and described the 6th capacitances in series.
In electrical apparatus for explosive atmospheres described in the utility model, the pin of described the second device is connected with at least one voltage stabilizing didoe, and the negative electrode of described voltage stabilizing didoe connects the pin of described the second device, the plus earth of described voltage stabilizing didoe.
In electrical apparatus for explosive atmospheres described in the utility model, described the first device is controller, and described the second device is display screen.
Implement the technical solution of the utility model, when in parallel after capacitance group on current-limiting resistance, in the time driving signal low and high level to change, capacitance group is changed a low impedance path to this level is provided, make the drive current on data wire become large, can resist more superpower radiation, if controller drive display screen, even under high-power RF radiation display screen can not spend screen yet.And, even if the interface rate of two device communications is very high, also can normally work.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is described in further detail, in accompanying drawing:
Fig. 1 is the circuit diagram of prior art electrical apparatus for explosive atmospheres;
Fig. 2 is the resolution chart of display screen input signal in Fig. 1;
Fig. 3 is the circuit diagram of the utility model electrical apparatus for explosive atmospheres embodiment mono-;
Fig. 4 is the oscillogram of Fig. 3 middle controller output signal, display screen input signal;
Fig. 5 A-Fig. 5 D be in Fig. 3 in the time that electric capacity is different capacitance the test waveform figure of the input signal of display screen;
Fig. 6 is the circuit diagram of the utility model electrical apparatus for explosive atmospheres embodiment bis-.
Embodiment
First explanation is; electrical apparatus for explosive atmospheres can be various fire-proof motors and the explosion-proof electric apparatus that is applied in (such as mine, oil field, flour mill etc.) in the environment with damp or dust; and explosion-proof electric apparatus comprises: explosion-proof transformer, flame-proof switch; explosion-proof starter, Explosion-Proof Relay, explosion-proof master control electrical apparatus, explosion-proof brake, explosion proof plug electrical equipment, anti-explosion terminal box, explosion-proof optoacoustic electrical equipment, flame proection, unexplosive power distribution unit, explosion-proof control panel, anti-explosion talkback machine etc.Also it should be noted that in addition, the following all embodiment of the application describe as anti-explosion talkback machine as example take electrical apparatus for explosive atmospheres,, the first device being arranged in safety zone is controller, the second device being exposed in deathtrap is display screen, and controller sends at least one by data wire to display screen and drives signal, to drive display screen to show accordingly.But those skilled in the art will be understood that, in other embodiments, electrical apparatus for explosive atmospheres also can be the equipment of other type, the second device being exposed in deathtrap is connected by data wire with the first device being arranged in safety zone, and, the first device can be to the second device data signal, the second device also can be to the first device data signal, electric capacity is connected between the pin and ground as signal input,, if the first device is to the second device data signal, electric capacity is connected between the respective pin and ground of the second device; If the second device is to the first device data signal, electric capacity is connected between the respective pin and ground of the first device.In addition, on each data wire, be provided with intrinsically safe circuit, this intrinsically safe circuit comprises current-limiting resistance and capacitance group, and, current-limiting resistance is connected between the pin of the first device and the pin of the second device, the capacitance of capacitance group is greater than 2.4 times of the capacitances of electric capacity, and capacitance group is in parallel with current-limiting resistance.
Fig. 3 is the circuit diagram of the utility model electrical apparatus for explosive atmospheres embodiment mono-, in this embodiment, electrical apparatus for explosive atmospheres is anti-explosion talkback machine, this anti-explosion talkback machine includes the first device controller of being arranged in safety zone, is exposed to display screen, capacitor C 1 and intrinsically safe circuit in deathtrap, controller is connected to display screen by board to board connector (not shown), and the output pin that pin WE is controller, the input pin that pin CON is display screen.Capacitor C 1 is connected between the pin CON and ground of display screen.And, the intrinsically safe circuit of this electrical apparatus for explosive atmospheres comprises current-limiting resistance R and capacitor C p, wherein, current-limiting resistance R is connected between the pin WE of controller and the pin CON of display screen, capacitor C p is in parallel with current-limiting resistance R, and the capacitance of capacitor C p is 1100pF, and the capacitance of electric capacity of voltage regulation C1 is 30pF.It should be noted that at this, although only show a current-limiting resistance in Fig. 3, should understand, transmit multiple data-signals if need to connect multiple data wires between controller and display screen, to there being multiple current-limiting resistances, and each current-limiting resistance is parallel with electric capacity.
The following describes the operation principle of this intrinsically safe circuit: compared to existing technology, owing to having increased capacitor C p, the signal U at controller to display screen output
wEwhen low and high level changes, for example, become low level or become high level from low level from high level, capacitor C p presents Low ESR to the signal of this transition, make the drive current on data wire become large, can resist more superpower radiation, even display screen can not spent screen yet under high-power RF radiation.And the level of the input signal of display screen changes very fast, even if the interface rate that controller and display screen communicate is very high, also can normally work.
Be described as follows in conjunction with Fig. 4: the output signal U of controller
wEfor square wave, suppose the high level VH=3.3V of the output signal of controller, low level VL=0V.
If the output signal U of controller
wEbecome low level from high level, be equivalent to output signal U
wEby unsettled unexpected ground connection, and the voltage of capacitor C 1 can not suddenly change, and is approximately 3.3V.Now, the electric charge on capacitor C l first passes through the ESR(Equivalent Series Resistance of capacitor C p, equivalent series resistance) charge until the voltage of capacitor C 1 and capacitor C p equates to capacitor C p fast, and be all U
cON.According to charge conservation: C1*3.3V=(Cp+C1) * U
cON, the output signal after therefore can being changed, i.e. the input signal U of the pin CON of display screen
cON=3.3V*Cl/ (Cp+Cl).Then capacitor C 1 slowly discharges into 0V by current-limiting resistance R again.If Cp>>Cl, U
cON≈ 0V, in this embodiment, Cp=1100pF, C1=30pF.
If the output signal U of controller
wEbecome high level from low level, the pin WE that is equivalent to controller jumps to suddenly 3.3V by 0V, and the voltage of capacitor C 1 can not suddenly change, and is 0V.Now, output signal U
wEhigh level fast capacitor C l is charged by the ESR of capacitor C p and the ESR of capacitor C l, according to charge conservation: 3.3V* (Cp*C1)/(Cp+C1)=C1*U
cON, the output signal after therefore can being changed, i.e. the input signal U of the pin CON of display screen
cON=3.3V*Cp/ (Cp+Cl), if Cp>>Cl, U
cON≈ 3.3V.Then, output signal U
wEhigh level again by current-limiting resistance R slowly give capacitor C l be charged to 3.3V.
As shown in Figure 4, the pin CON of display screen corresponding input signal U respectively in the time contrasting without capacitor C p and have capacitor C p
cONknown, when having added after capacitor C p, capacitor C p can provide a low impedance path, makes controller become large to the drive current of display screen output, can resist more superpower radiation, if display screen connection is display screen, display screen can not spent screen.And the level of the input signal of display screen changes very fast, even be high-speed interface between display screen and controller, also can normally work.
Fig. 5 A-Fig. 5 D be in Fig. 3 in the time that electric capacity is different capacitance the test waveform figure of the input signal of display screen, in Fig. 5 A, without electric capacity, in Fig. 5 B, capacitor C p is 100pF, in Fig. 5 C, capacitor C p is 390pF, in Fig. 5 C, capacitor C p is 100000pF.Comparison diagram 5A-Fig. 5 D, can see, the capacitance of capacitor C p is larger, the waveform of the input signal of the pin CON of display screen more approaches square wave, controller is larger to the drive current of display screen output, can resist more superpower radiation, and, allow the state of data wire be transformed into definite high level or the low level time shorter.
Fig. 6 is the circuit diagram of the utility model electrical apparatus for explosive atmospheres embodiment bis-, and this electrical apparatus for explosive atmospheres includes controller, display screen, capacitor C 1, voltage stabilizing didoe DE315, DE316 and intrinsically safe circuit, and controller is connected with display screen.Capacitor C 1 is connected between the pin CON and ground of display screen.And, the intrinsically safe circuit of this electrical apparatus for explosive atmospheres comprises current-limiting resistance R and the capacitor C p1, the Cp2 that are in series, wherein, current-limiting resistance R is connected between the pin WE of controller and the pin CON of display screen, in parallel with current-limiting resistance R after capacitor C p1, Cp2 series connection, and the capacitance of capacitor C p1, Cp2 is respectively 2200pF, and the capacitance of capacitor C 1 is 10pF.The anode of voltage stabilizing didoe DE315, DE316 is ground connection respectively, the negative electrode of voltage stabilizing didoe DE315, DE316 meets respectively the pin CON of display screen, it should be noted that, in other embodiments, voltage stabilizing didoe DE315, DE316 can save one or two, certainly, the quantity of voltage stabilizing didoe can also be greater than two.Its operation principle is identical with the embodiment mono-shown in Fig. 3, does not repeat at this.But with the embodiment difference shown in Fig. 3 be: the embodiment shown in Fig. 3 is applicable to " ic " explosive-proof grade, and the embodiment shown in Fig. 4 is applicable to " ib " explosive-proof grade,, capacitor C p1 or Cp2 are short-circuited after fault therein, this intrinsically safe circuit still can increase drive current, and can make rapidly the state of data wire be transformed into definite high level or low level.Certainly, for " ia " explosive-proof grade, can be on current-limiting resistance R the electric capacity of three series connection in parallel.Finally also it should be noted that, for each electric capacity in each explosive-proof grade, the capacitance group that all can be made up of multiple series, parallel, the electric capacity of mixing connection substitutes.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various changes, combination and variation.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in claim scope of the present utility model.
Claims (6)
1. an electrical apparatus for explosive atmospheres, it is characterized in that, comprise the first device being arranged in safety zone, be exposed to the second device in deathtrap, described the first device is connected by least one data wire with described the second device, and, between the pin of inputting as signal on described the first device and/or the second device and ground, be connected with electric capacity, on each data wire, be provided with intrinsically safe circuit, described intrinsically safe circuit comprises the current-limiting resistance being connected between the pin of described the first device and the pin of described the second device, and capacitance is greater than the capacitance group of 2.4 times of the capacitances of described electric capacity, and, described capacitance group is in parallel with described current-limiting resistance.
2. electrical apparatus for explosive atmospheres according to claim 1, is characterized in that, described capacitance group comprises the first electric capacity, and described the first electric capacity is in parallel with described current-limiting resistance.
3. electrical apparatus for explosive atmospheres according to claim 1, is characterized in that, described capacitance group comprises the second electric capacity and the 3rd electric capacity that are in series, in parallel with described current-limiting resistance after described the second electric capacity and described the 3rd capacitances in series.
4. electrical apparatus for explosive atmospheres according to claim 1, is characterized in that, described capacitance group comprises the 4th electric capacity, the 5th electric capacity and the 6th electric capacity that are in series, in parallel with described current-limiting resistance after described the 4th electric capacity, the 5th electric capacity and described the 6th capacitances in series.
5. electrical apparatus for explosive atmospheres according to claim 1, it is characterized in that, the pin of described the second device is connected with at least one voltage stabilizing didoe, and the negative electrode of described voltage stabilizing didoe is connected to the pin of described the second device, the plus earth of described voltage stabilizing didoe.
6. electrical apparatus for explosive atmospheres according to claim 1, is characterized in that, described the first device is controller, and described the second device is display screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320666238.9U CN203607833U (en) | 2013-10-25 | 2013-10-25 | An explosion-proof electric device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320666238.9U CN203607833U (en) | 2013-10-25 | 2013-10-25 | An explosion-proof electric device |
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| Publication Number | Publication Date |
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| CN203607833U true CN203607833U (en) | 2014-05-21 |
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| CN201320666238.9U Expired - Lifetime CN203607833U (en) | 2013-10-25 | 2013-10-25 | An explosion-proof electric device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105553235A (en) * | 2014-10-24 | 2016-05-04 | 株式会社日立制作所 | Semiconductor actuating device and power conversion device using same |
| CN105720550A (en) * | 2016-04-25 | 2016-06-29 | 深圳市宝尔爱迪科技有限公司 | Explosion-proof data line circuit and explosion-proof data line with same |
| CN111268632A (en) * | 2020-04-23 | 2020-06-12 | 南阳防爆电气研究所有限公司 | Oil gas recovery online monitoring system of gas station and explosion-proof evaluation method |
| US20220006289A1 (en) * | 2020-07-02 | 2022-01-06 | Infineon Technologies Ag | Electrostatic discharge, ESD, protection device for a Universal Serial Bus, USB, interface |
-
2013
- 2013-10-25 CN CN201320666238.9U patent/CN203607833U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105553235A (en) * | 2014-10-24 | 2016-05-04 | 株式会社日立制作所 | Semiconductor actuating device and power conversion device using same |
| CN105553235B (en) * | 2014-10-24 | 2018-02-02 | 株式会社日立制作所 | Semiconductor drive device and the power-converting device using the semiconductor drive device |
| CN105720550A (en) * | 2016-04-25 | 2016-06-29 | 深圳市宝尔爱迪科技有限公司 | Explosion-proof data line circuit and explosion-proof data line with same |
| CN111268632A (en) * | 2020-04-23 | 2020-06-12 | 南阳防爆电气研究所有限公司 | Oil gas recovery online monitoring system of gas station and explosion-proof evaluation method |
| CN111268632B (en) * | 2020-04-23 | 2021-08-24 | 南阳防爆电气研究所有限公司 | Oil gas recovery online monitoring system of gas station and explosion-proof evaluation method |
| US20220006289A1 (en) * | 2020-07-02 | 2022-01-06 | Infineon Technologies Ag | Electrostatic discharge, ESD, protection device for a Universal Serial Bus, USB, interface |
| US11670940B2 (en) * | 2020-07-02 | 2023-06-06 | Infineon Technologies Ag | Electrostatic discharge, ESD, protection device for a Universal Serial Bus, USB, interface |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140521 |