CN101826714B - Intrinsically-safe type control device - Google Patents
Intrinsically-safe type control device Download PDFInfo
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- CN101826714B CN101826714B CN2010101203217A CN201010120321A CN101826714B CN 101826714 B CN101826714 B CN 101826714B CN 2010101203217 A CN2010101203217 A CN 2010101203217A CN 201010120321 A CN201010120321 A CN 201010120321A CN 101826714 B CN101826714 B CN 101826714B
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Abstract
The invention relates to an intrinsically-safe type control device which is provided with an intrinsically-safe pilot loop that is used for sampling on an external power supply; a signal processing unit is connected with the intrinsically-safe pilot loop and used for processing a sampling signal and respectively controlling an execution unit and a display unit; the input end of a self-holding unit is connected with the external power supply, and the output end of the self-holding unit is connected with the intrinsically-safe pilot loop and used for finishing the self-holding action after starting is finished; and a power circuit respectively supplies power for the signal processing unit, the display unit and the execution unit. The intrinsically-safe pilot loop is provided with dual-gate protectors, a first current-limiting resistor, a second current-limiting resistor, a rectifier bridge and a photoelectric coupler, wherein the dual-gate protectors are connected with a transformer secondary pole in parallel, the first current-limiting resistor and the second current-limiting resistor are sequentially connected with the transformer secondary pole in series, the rectifier bridge is connected with the other end of the second current-limiting resistor, and the photoelectric coupler is connected with the rectifier bridge. The intrinsically-safe type control device is easy to satisfy the performance requirement of intrinsic safety, can be shut down in a starting state if a control cable is short-circuited and can not be self-started in a shutdown state if the control cable is short-circuited; therefore, the striking phenomenon of a relay can not appear at any time, and the relay is avoided from being damaged.
Description
Technical field
The invention belongs to a kind of switch controlling device, particularly relate to a kind of power circuit that comprises, signal processing unit, intrinsic safety guide loop, display unit, performance element and stick unit's intrinsically-safe type control device.
Background technology
Along with the centralization and the maximization of extractive equipment under the coal mine, control technology able to programme (being called for short PLC) has obtained corresponding promotion and application, and increasing down-hole switch has adopted control and the protection of PLC.Because the centralization and the maximization of equipment; The control lead-in wire of starter and control button constantly prolongs; Causing this cable to be damaged with the probability of short circuit increases, and again because of having gas and coal dust under the coal mine, requires the circuit of starter to control button must adopt the essential safe type assembly.
At present; The control assembly of a kind of being called " intrinsic safety type control relay " is all selected in the control of the distant place of most of switch for use under the domestic coal mine; This is the product of China last century eight, the nineties, moves when it mainly reaches certain value by the direct current that flows through its first conductance relay.Owing to limited by the common relay operating current, its short circuit current has the shortcoming of non-intrinsically safe safety up to more than the 80mA on the structure.According to interrelated data record, under certain environment, when motor in the running status control cable during by short circuit, contactor can not break off, stop button also loses the shutdown effect; When motor during, if electric control cable far away is during by short circuit, because the loop is under the halfwave rectifier state in halted state; " self-starting " phenomenon possibly take place; And no matter whether motor moves, need only electric control cable far away by short circuit, relay all can produce the sharp-pointed noise of getting ready; The contact produces violent shake, and damages very soon.
Summary of the invention
The present invention provides a kind of under open state, if control cable can be shut down by short circuit at once for solving the technical problem that exists in the known technology; Under stopped status, control cable self-starting can not occurred by short circuit; Relay no matter when can not occur and get phenomenon ready, avoid the intrinsically-safe type control device of the damage of relay.
The technical scheme that the present invention takes for the technical problem that exists in the solution known technology is: a kind of intrinsically-safe type control device; Comprise power circuit, also be provided with signal processing unit, intrinsic safety guide loop; Display unit; Performance element and stick unit, wherein, described intrinsic safety guide loop is used for external power source is taken a sample; Described signal processing unit connects intrinsic safety guide loop; Sampled signal is handled, and control execution unit execution driving action, also control display unit simultaneously and show; Described stick unit's input connects external power source; Output connects the self-sustaining action after intrinsic safety guide loop is used to accomplish startup, and described power circuit provides power supply to signal processing unit, display unit and performance element respectively, and described stick unit comprises first rectifier bridge that links to each other with external power source; 2 pin of described first rectifier bridge connect the collector electrode of triode; Also connect the base stage of triode through the 4th resistance, 4 pin of described first rectifier bridge connect voltage stabilizing didoe, diode, light-emitting diode and first relay respectively, and the other end of described voltage stabilizing didoe connects the base stage of triode; The other end of diode connects the emitter of triode; The other end of light-emitting diode is through the emitter of the 3rd resistance connection triode, and the other end of first relay connects the emitter of triode, and the normally opened contact of first relay connects intrinsic safety guide loop.
Described intrinsic safety guide loop includes transformer; Be connected in parallel on the double grid protector of transformer secondary output; Be connected on first current-limiting resistance and second current-limiting resistance of transformer secondary output successively; Be connected second rectifier bridge of the second current-limiting resistance other end, and the photoelectrical coupler that links to each other with second rectifier bridge, the output of described photoelectrical coupler connects signal processing unit.
The end point in described intrinsic safety guide loop connects the switch of external device (ED) respectively.
Described signal processing unit comprises first operational amplifier that links to each other with the output of intrinsic safety guide loop; Through the 14 resistance single-chip microcomputer that links to each other with the output of first operational amplifier and second operational amplifier that links to each other with the output of first operational amplifier through the 13 resistance; The output of described second operational amplifier connects performance element through the 12 resistance; Described single-chip microcomputer connects display unit through first resistance, also connects performance element through the 15 resistance.
Described display unit includes the power supply demonstration, start shows and short circuit shows.
Advantage and good effect that the present invention has are: intrinsically-safe type control device of the present invention, signal processing unit adopt singlechip technology that pilot signal is carried out collection analysis, and send the corresponding action instruction according to analysis result.Because the waveform signal that the guide loop only is responsible for providing a reflection to exist does not have energy requirement,, be easy to satisfy the performance requirement of essential safety so only tens milliamperes of short circuit currents make the intrinsic safety performance be greatly improved.And the present invention is under open state, if control cable can be shut down by short circuit at once; Under stopped status, control cable self-starting can not occurred by short circuit; Relay no matter when can not occur and get phenomenon ready, avoid the damage of relay.The present invention is equipped with " power supply ", " start " and " short circuit " signal shows, when the control cable short circuit, has " short circuit " Presentation Function.In addition, the present invention also has self-sustaining mode very flexibly: can be through the return contact of main contactor, and also available self relay is accomplished.
Description of drawings
Fig. 1 is a formation block diagram of the present invention;
Fig. 2 is circuit theory diagrams of the present invention.
Label among the figure is respectively:
The 1-signal processing unit; 2-intrinsic safety guide loop; The 3-display unit; The 4-performance element; The 5-power circuit; The 6-stick unit.
Embodiment
For further understanding summary of the invention of the present invention, characteristics and effect, enumerate following examples now, and conjunction with figs. specifies as follows of the present invention:
As shown in Figure 1, intrinsically-safe type control device of the present invention comprises power circuit 5, signal processing unit 1, and intrinsic safety guide loop 2, display unit 3, performance element 4 and stick unit 6, wherein, described intrinsic safety guide loop 2 is used for external power source U is taken a sample; Described signal processing unit 1 connects intrinsic safety guide loop 2; Sampled signal is handled; And control execution unit 4 execution driving actions, also to control display unit 3 simultaneously and show, described stick unit's 6 input connects external power source U; Output connects the self-sustaining action after intrinsic safety guide loop 2 is used to accomplish startup, and described power circuit 5 provides power supply to signal processing unit 1, display unit 3 and performance element 4 respectively.
As shown in Figure 2; Described intrinsic safety guide loop 2 includes transformer B1; Be connected in parallel on the double grid protector W1-W4 of B1 level of transformer, be connected on the first current-limiting resistance R1 and the second current-limiting resistance R2 of B1 level of transformer successively, be connected the rectifier bridge D3 of the second current-limiting resistance R2 other end; And the photoelectrical coupler U2 that links to each other with rectifier bridge D3, the output of described photoelectrical coupler U2 connects signal processing unit 1.End point 1 end, 2 ends in described intrinsic safety guide loop 2 connect the switch that startup connects external device (ED) respectively, and 4 ends are the ground connection leading-out terminal.
The inferior pole tension of transformer B1, is measured at intrinsic safety port one end and 2 ends with the power frequency table after double grid pressure limiting and resistance current limliting for exchanging 44V: its open circuit voltage≤33V, and short circuit current≤13mA, working direct current is not more than 6mA.During operate as normal, 1 end and 2 terminations are gone into the switch of external device (ED), and the electric current that flows through photoelectrical coupler is the direct current half-wave, and during fault, the electric current that flows through photoelectrical coupler is the direct current all-wave.
Described signal processing unit 1 comprises the first operational amplifier U4A that links to each other with 2 outputs of intrinsic safety guide loop; Through the 14 resistance R 14 single-chip microcomputer U3 that links to each other with first operational amplifier U4A output and the second operational amplifier U4B that links to each other with first operational amplifier U4A output through the 13 resistance R 13; The output of the described second operational amplifier U4B connects performance element 4 through the 12 resistance R 12; Described single-chip microcomputer U3 connects display unit 3 through first resistance R 11, also connects performance element 4 through the 15 resistance R 15.
The electric current that flows through intrinsic safety guide loop 2 is taken a sample through rectifier bridge D3 and photoelectrical coupler U2, obtains voltage signal at 4 pin of photoelectrical coupler U2, after signal processing unit 1 is handled, is communicated with relay K 2 and relay K 3.As long as there is electric current in intrinsic safety guide loop 2, relay K 2 can in time not discharge when there be not electric current with regard to adhesive.Relay K 3 is received when the electric current in guide loop is the direct current half-wave voltage signal, this relay adhesive, and this relay discharges during for direct current all-wave signal, and triode Q5 conducting simultaneously becomes orange colour with power supply indicator by redness, carries out short-circuit alarming and shows.
Described stick unit 6 comprises the rectifier bridge D1 that links to each other with external power source U; 2 pin of described rectifier bridge D1 connect the collector electrode of triode Q1; The base stage that also connects triode Q1 through the 4th resistance R 4; 4 pin of described rectifier bridge D1 connect voltage stabilizing didoe W5, diode V1, LED and first relay K 1 respectively; The other end of described voltage stabilizing didoe W5 connects the base stage of triode Q1, and the other end of diode V1 connects the emitter of triode Q1, and the other end of LED connects the emitter of triode Q1 through the 3rd resistance R 3; The other end of first relay K 1 connects the emitter of triode Q1, and the normally opened contact of first relay K 1 connects intrinsic safety guide loop 2.
Described display unit 3 comprises that power supply shows that L, start show that K and short circuit show D.
Described performance element 4 comprises relay K 3, relay K 2 and relay K 4, wherein, and the coil one termination 24V power supply of relay K 3; The other end connects signal processing unit 1 through triode Q4, and the normally opened contact of relay K 3 connects the emitter of triode Q3, and an end of relay K 2 coils connects the 24V power supply; The other end is again to connect signal processing unit 1 through triode Q3; The normally opened contact of relay K 2 connects the output port of this device, has only the normally opened contact adhesive of relay K 3, the coil electricity of relay K 2; The normally opened contact adhesive of relay K 2 just can be sent the instruction of driving.
And the coil of the output port of this device through external contactor KM connecting external power source; After the driving instruction is sent; External contactor KM is activated, and its return contact is with ac power input end 7 ends and the 6 end short circuits of this device, and the coil of relay K 1 gets; The normally opened contact of relay K 1 is closed, has accomplished the self-sustaining work after starting.
Intrinsically-safe type control device of the present invention, only from the intercepting of guide loop a voltage waveform signal, analysis, judgement through single-chip microcomputer draw the instruction of whether sending start.The electric current in its guide loop can be done very lowly.And the final element of intrinsically-safe type control device of the present invention does not have the directivity requirement.
Claims (5)
1. an intrinsically-safe type control device comprises power circuit (5), signal processing unit (1); Intrinsic safety guide loop (2), display unit (3), performance element (4) and stick unit (6); Wherein, described intrinsic safety guide loop (2) is used for external power source (U) is taken a sample; Described signal processing unit (1) connects intrinsic safety guide loop (2); Sampled signal is handled; And control execution unit (4) is carried out the action of driving; Also control display unit (3) simultaneously and show, described stick unit's (6) input connects external power source (U), and output connects the self-sustaining action after intrinsic safety guide loop (2) is used to accomplish startup; Described power circuit (5) provides power supply to signal processing unit (1), display unit (3) and performance element (4) respectively; It is characterized in that: described stick unit (6) comprises first rectifier bridge (D1) that links to each other with external power source (U), and 2 pin of described first rectifier bridge (D1) connect the collector electrode of triode (Q1), also connects the base stage of triode (Q1) through the 4th resistance (R4); 4 pin of described first rectifier bridge (D1) connect voltage stabilizing didoe (W5), diode (V1), light-emitting diode (LED) and first relay (K1) respectively; The other end of described voltage stabilizing didoe (W5) connects the base stage of triode (Q1), and the other end of diode (V1) connects the emitter of triode (Q1), and the other end of light-emitting diode (LED) connects the emitter of triode (Q1) through the 3rd resistance (R3); The other end of first relay (K1) connects the emitter of triode (Q1), and the normally opened contact of first relay (K1) connects intrinsic safety guide loop (2).
2. intrinsically-safe type control device according to claim 1; It is characterized in that: described intrinsic safety guide loop (2) includes transformer (B1); Be connected in parallel on the secondary double grid protector (W1-W4) of transformer (B1); Be connected on secondary first current-limiting resistance (R1) of transformer (B1) and second current-limiting resistance (R2) successively; Be connected second rectifier bridge (D3) of second current-limiting resistance (R2) other end, and the photoelectrical coupler (U2) that links to each other with second rectifier bridge (D3), the output of described photoelectrical coupler (U2) connects signal processing unit (1).
3. intrinsically-safe type control device according to claim 1 is characterized in that: the end point in described intrinsic safety guide loop (2) connects the switch of external device (ED) respectively.
4. intrinsically-safe type control device according to claim 1; It is characterized in that: described signal processing unit (1) comprises first operational amplifier (U4A) that links to each other with intrinsic safety guide loop (2) output; Through the 14 resistance (R14) single-chip microcomputer (U3) that links to each other with first operational amplifier (U4A) output and second operational amplifier (U4B) that links to each other with first operational amplifier (U4A) output through the 13 resistance (R13); The output of described second operational amplifier (U4B) connects performance element (4) through the 12 resistance (R12); Described single-chip microcomputer (U3) connects display unit (3) through first resistance (R11), also connects performance element (4) through the 15 resistance (R15).
5. intrinsically-safe type control device according to claim 1 is characterized in that: described display unit (3) includes power supply and shows that (L), start show that (K) and short circuit show (D).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101203217A CN101826714B (en) | 2010-03-09 | 2010-03-09 | Intrinsically-safe type control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101203217A CN101826714B (en) | 2010-03-09 | 2010-03-09 | Intrinsically-safe type control device |
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| Publication Number | Publication Date |
|---|---|
| CN101826714A CN101826714A (en) | 2010-09-08 |
| CN101826714B true CN101826714B (en) | 2012-07-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010101203217A Expired - Fee Related CN101826714B (en) | 2010-03-09 | 2010-03-09 | Intrinsically-safe type control device |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103715648B (en) * | 2013-12-13 | 2016-05-25 | 常州联力自动化科技有限公司 | A kind of pilot circuit treating apparatus |
| CN103795047A (en) * | 2014-02-25 | 2014-05-14 | 淮南万泰电子股份有限公司 | Remote intrinsic safety control circuit for mine |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2219556Y (en) * | 1993-12-23 | 1996-02-07 | 徐州煤矿机械厂 | Safety leader circuit controller |
| CN2362235Y (en) * | 1998-11-05 | 2000-02-02 | 杨卫英 | Mine magnetic starter with photoelectric coupling guide circuit |
| CN201682258U (en) * | 2010-03-09 | 2010-12-22 | 天津市天矿电器设备有限公司 | Intrinsic safety type component |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008306799A (en) * | 2007-06-05 | 2008-12-18 | Canon Inc | Power supply device, method of controlling power supply device, program, and storage medium |
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2010
- 2010-03-09 CN CN2010101203217A patent/CN101826714B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2219556Y (en) * | 1993-12-23 | 1996-02-07 | 徐州煤矿机械厂 | Safety leader circuit controller |
| CN2362235Y (en) * | 1998-11-05 | 2000-02-02 | 杨卫英 | Mine magnetic starter with photoelectric coupling guide circuit |
| CN201682258U (en) * | 2010-03-09 | 2010-12-22 | 天津市天矿电器设备有限公司 | Intrinsic safety type component |
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| CN101826714A (en) | 2010-09-08 |
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Granted publication date: 20120725 Termination date: 20130309 |