CN101673928A - Input/output overcurrent and overvoltage protective module of microcomputer distributed control system - Google Patents
Input/output overcurrent and overvoltage protective module of microcomputer distributed control system Download PDFInfo
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- CN101673928A CN101673928A CN200910018500A CN200910018500A CN101673928A CN 101673928 A CN101673928 A CN 101673928A CN 200910018500 A CN200910018500 A CN 200910018500A CN 200910018500 A CN200910018500 A CN 200910018500A CN 101673928 A CN101673928 A CN 101673928A
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Abstract
The invention relates to an input/output overcurrent and overvoltage protective module of a microcomputer distributed control system, comprising a primary measurement equipment connecting end and a protected equipment fastener connecting end. A measurement signal working circuit is connected with a fuse tube F1; in the measurement signal working circuit, the positive half cycle of alternating current voltage passes through diodes D1 and D3 and the negative half cycle passes through diodes D2 and D4 to form a full-wave rectifier circuit, the rectified direct current voltage is sampled by a sampling diode W1 and enters a control electrode of a triode VT; and a collector electrode of the triode VT is respectively connected with the diodes D1 and D2, and an emitting electrode of the triode VTis respectively connected with the diodes D3 and D4. The input/output overcurrent and overvoltage protective module of the microcomputer distributed control system is protective equipment which is specially used for protecting various fasteners in a DSC measuring system from being damaged by overvoltage or overcurrent of alternation current or direct current. The protective module is applicable tovarious channels of 24VDC positive and negative logic circuits, is free from an additional power source and can be directly serially connected with a 24VDC circuit according to a positive electrode and a negative electrode. The invention can completely and effectively provide protection for various channels.
Description
Technical field
The present invention relates to a kind ofly be used for protecting various fasteners in the DCS measuring system, relate in particular to a kind of microcomputer distributed control system input/output overcurrent and overvoltage protective module not because of the protection equipment that exchanges or the direct current over-voltage and over-current damages.
Background technology
Along with the develop rapidly of scientific and technological level, the commercial measurement automatic control level is greatly improved.Wherein the most representative DCS (Distributed Control System) is the highest level of current automatic control system.But from actual operation, DCS does not possess the function of self-protection, in case meet accident, will bring in various degree loss to enterprise.
Module in micro-controller system (being fastener) is that the analog-signal transitions with one-shot measurement equipment becomes digital signal, and is transferred to microcomputer, for the key equipment of analyzing and handling.The complex structure though its volume is little belongs to expensive high-tech product.Fastener is in the position, forward position in the DCS system, and self does not have self protective function.Statistical analysis according to the module damaged condition can find out that the reason that causes module to damage mainly contains three: the one, and overvoltage; The 2nd, overcurrent; The 3rd, alternating voltage seals in.The 4-20mA analog signal that fastener received in measuring system all is from the ac electric apparatus equipment that uses 220V or 380V.And AC electric equipment in the course of the work leaky happen occasionally, thereby very easily cause alternating voltage to enter fastener by the 4-20mA signal line, fastener is pressed by forceful electric power burns out, fastener is damaged will directly have influence on the normal operation of enterprise.
In power plant's real work, discovery is when utilization DCS control system, the fastener that DCS is used, under the high slightly situation of voltage, electric current, fastener is withstand voltage, and limited being easy to of anti-stream burnt out and punctured, can influence the operating state (fastener is minimum to be 15 tunnel) on each road of whole fastener after the damage, it directly influences the normal operation of generator and boiler.Small power plant with one 50,000 unit is an example, and one is worth 4000 yuan fastener damage and causes shutting down stopping production, and enterprise's one-day loss will be counted in 100,000, and will be perhaps more.Therefore the fastener that the DCS system is used carries out necessary protection along separate routes by passage, guarantees continuous, stable, the operation efficiently of DCS system, and enterprise is run and developed normally, avoids unnecessary loss to play crucial effects.
Summary of the invention
The purpose of this invention is to provide the microcomputer distributed control system input/output overcurrent and overvoltage protective module that a kind of fastener that the DCS system is used carries out necessary protection.
For achieving the above object, the technical solution used in the present invention is:
A kind of microcomputer distributed control system input/output overcurrent and overvoltage protective module comprises: one-shot measurement equipment link and protected equipment fastener link is characterized in that: the measuring-signal work loop of one-shot measurement equipment link is connected with cartridge fuse F1; In the measuring-signal loop, alternating current positive pressure half cycle is through diode D1, D3, and the alternating voltage negative half period constitutes full-wave rectifying circuit through diode D2, D4, after sampling diode W1 sampling, is sent into the triode VT control utmost point by the direct voltage after the rectification; The collector electrode of triode VT is connected with described diode D1, D2 respectively, and the emitter of triode VT is connected with described diode D3, D4 respectively.
According to described microcomputer distributed control system input/output overcurrent and overvoltage protective module, it is characterized in that: be connected with HF filtering capacitor C1 between the control utmost point of described triode VT and the emitter.
According to described microcomputer distributed control system input/output overcurrent and overvoltage protective module, it is characterized in that: be connected in parallel to protection diode D5 in the described measuring-signal work loop.
According to described microcomputer distributed control system input/output overcurrent and overvoltage protective module, it is characterized in that: described measuring-signal work is connected with current-limiting protection resistance in the loop.
Microcomputer distributed control system input/output overcurrent and overvoltage protective module of the present invention (DCS-I/O) is used for protecting various fasteners in the DCS measuring system not exchanged or direct current over-voltage and over-current and the protection equipment that damages under the situation that fully takes into account the various operational environments of fastener, work purpose and systemic effect specially.This protection module is applicable to each passage of 24VDC mixed logic circuit.Do not need to add power supply in addition, press both positive and negative polarity, directly seal in the 24VDC loop and get final product.The present invention has fundamentally solved the inadequate natural endowment of DCS system fastener, and the present invention can provide protection to various passages safely and effectively.
Description of drawings
Fig. 1 is the present invention and one-shot measurement equipment and protected equipment fastener connection diagram.
Fig. 2 is circuit theory diagrams of the present invention.
Embodiment
The invention will be further described below in conjunction with the drawings and specific embodiments:
Microcomputer distributed control system input/output overcurrent and overvoltage protective module of the present invention and one-shot measurement equipment and the method for attachment of protected equipment fastener are as shown in Figure 1; microcomputer distributed control system input/output overcurrent and overvoltage protective module (DCS-IO) method of attachment; can by 1 end of Fig. 1,2 ends "+;-" utmost point series connection is linked in the protected signal voltage 24V work loop and gets final product, and connection is seen Fig. 1.
Circuit theory diagrams of the present invention comprise as shown in Figure 2: one-shot measurement equipment link and protected equipment fastener link, and the measuring-signal work loop of one-shot measurement equipment link is connected with cartridge fuse F1; In the measuring-signal loop, alternating current positive pressure half cycle is through diode D1, D3, and the alternating voltage negative half period constitutes full-wave rectifying circuit through diode D2, D4, after sampling diode W1 sampling, is sent into the triode VT control utmost point by the direct voltage after the rectification; The collector electrode of triode VT is connected with described diode D1, D2 respectively, and the emitter of triode VT is connected with described diode D3, D4 respectively.
Be connected with HF filtering capacitor C1 between the control utmost point of described triode VT and the emitter.
Be connected in parallel to protection diode D5 in the described measuring-signal work loop.
Described measuring-signal work is connected with current-limiting protection resistance R 1, R2 in the loop, and current-limiting protection resistance R 1, two of R2 are connected in parallel.
Operation principle of the present invention is as follows:
One, measuring-signal 4-20mA work loop enters the over-voltage over-current protection module through cartridge fuse F1, and then enters protected equipment.When DC24V work loop just often, this protection module is in the garrison state.When overvoltage appearred in signal circuit, no matter be alternating voltage or direct voltage, this protection module detected when being non-operating voltage, and moment enters guard mode rapidly.After entering guard mode, the protected module short circuit in measuring equipment signal work loop cuts off, and the voltage that A point on the moment work loop that cuts off and B are ordered is not higher than protected equipment normal working voltage.
Because signal circuit is by this protection module short circuit, cartridge fuse F1 is fused in moment, makes protected equipment be harmful to voltage with inoperative rapidly and is separated from, and therefore, measuring equipment obtains effective safeguard protection.
Two, operation principle
When alternating voltage invasion and attack measuring-signal loop, alternating current positive pressure half cycle is through diode D1, D3, negative half period is through diode D2, D4, constitute full-wave rectification, by the direct voltage after the rectification after sampling diode W1 sampling approval, send into the triode VT control utmost point (this sampling direct voltage is the W1 reverse breakdown voltage, can be optional between 30-40V according to actual needs).Triode VT obtains triggering back conducting rapidly, because of the conducting of triode VT makes the direct voltage loop by triode VT short circuit.Therefore, cartridge fuse F1 moment is fused in the measurement signal voltages work loop, and harmful voltage of inoperative and protected equipment are hightailed out.
When signal voltage DC24V work loop, when being subjected to the external pulse voltge surge, when pulse voltage was higher than 1 volt, protected diode D5 direct short-circuit absorbed, and protection diode D5 plays the effect that the short circuit of alternating voltage half-wave is absorbed simultaneously.Therefore, protection diode D5 plays an important role in the protection process, and R1, R2 are the current limliting protective resistance, power 1/8W, 1000 ohm, 2 parallel connections.
C1 is a HF filtering capacitor, and HF filtering capacitor C1 enters the triode VT control utmost point for preventing pulse signal voltage, produces misoperation and the filtering capacitor established.
Three, use selection of components:
Diode D1-D5,1N4007.1A.1KV.
Voltage-stabiliser tube W1.2CW119.30-36V;
Or 2DW13D.36-40V.
Triode BU406H.BU408.400V.7A.60W;
Or 2SC4797.900V8A.50W.
Capacitor C1 0.047 microfarad .250V.
Fuse F1 0.1A-0.25A fast thawing type.
Four, operation instruction
The DCS-IO protection module method of coming into operation can be linked in the protected signal voltage 24V work loop by the series connection of 1 end, 2 ends "+, the-" utmost point and get final product, and connection is seen Fig. 1.
When instrument loses the 4-20MA signal, should check at first whether cartridge fuse F1 is fused, when cartridge fuse F1 occurring and fused, this illustrates by inoperative voltage entering signal voltage DC24V loop.
At this moment should ascertain the reason at the cartridge fuse of changing the same model specification; be 0.1A-0.25A; 5X20mm fast thawing cartridge fuse; this circuit of temperature signal input protection (module path protection) is removed protection diode D5 and current-limiting protection resistance R 1, R2; current-limiting protection resistance R 1, R2 two ends end directly are connected to the temperature input protection, adapt to thermal resistance signal, thermocouple signal.
This module serviceability temperature+60 degree are to-40 degree.
Five, the DCS-IO protection module scope of application;
1, microcomputer. module (fastener)
The 4-20mA analog signal. input and output (unit is a passage).
2,24V.DC switching value. input. output. (unit is a passage).
24VDC transmitter (1151 type) (unit is a platform).
24V.DC pressure transmitter (unit is a platform).
3, the various secondary meters (unit is piece) that use the 0-20mA signal.
4, various electric actuator:
0-10mA. input. output. signal.
0-20mA. input. output. signal.
4-20mA. input. output. signal.
Six, indicate
The F1 that uses in the DCS-IO protection module circuit (being protective tube) is instant type cartridge fuse, as changes this Guan Shiying strictness and change on request, must not retrofit or strengthen fuse capacity arbitrarily, otherwise will burn out module and protected equipment.
The used cartridge fuse specification of DCS-IO protection module is as follows:
Electric current 0.1A-0.25A fast thawing type cartridge fuse.Use the cartridge fuse maximum current can not surpass 0.25A, specification 5X20mm.
Embodiment recited above is described preferred implementation of the present invention; be not that design of the present invention and protection range are limited; under the prerequisite that does not break away from design concept of the present invention; common engineers and technicians make technical scheme of the present invention in this area various modification and improvement all should fall into protection scope of the present invention.
Claims (4)
1, a kind of microcomputer distributed control system input/output overcurrent and overvoltage protective module comprises: one-shot measurement equipment link and protected equipment fastener link is characterized in that: the measuring-signal work loop of one-shot measurement equipment link is connected with cartridge fuse F1; In the measuring-signal loop, alternating current positive pressure half cycle is through diode D1, D3, and the alternating voltage negative half period constitutes full-wave rectifying circuit through diode D2, D4, after sampling diode W1 sampling, is sent into the triode VT control utmost point by the direct voltage after the rectification; The collector electrode of triode VT is connected with described diode D1, D2 respectively, and the emitter of triode VT is connected with described diode D3, D4 respectively.
2, microcomputer distributed control system input/output overcurrent and overvoltage protective module according to claim 1 is characterized in that: be connected with HF filtering capacitor C1 between the control utmost point of described triode VT and the emitter.
3, microcomputer distributed control system input/output overcurrent and overvoltage protective module according to claim 1 is characterized in that: be connected in parallel to protection diode D5 in the described measuring-signal work loop.
4, microcomputer distributed control system input/output overcurrent and overvoltage protective module according to claim 1 is characterized in that: described measuring-signal work is connected with current-limiting protection resistance in the loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910018500A CN101673928A (en) | 2009-09-30 | 2009-09-30 | Input/output overcurrent and overvoltage protective module of microcomputer distributed control system |
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|---|---|---|---|
| CN200910018500A CN101673928A (en) | 2009-09-30 | 2009-09-30 | Input/output overcurrent and overvoltage protective module of microcomputer distributed control system |
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| CN101673928A true CN101673928A (en) | 2010-03-17 |
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| CN200910018500A Pending CN101673928A (en) | 2009-09-30 | 2009-09-30 | Input/output overcurrent and overvoltage protective module of microcomputer distributed control system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106200749A (en) * | 2016-09-26 | 2016-12-07 | 浙江中控技术股份有限公司 | A kind of IO control system |
-
2009
- 2009-09-30 CN CN200910018500A patent/CN101673928A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106200749A (en) * | 2016-09-26 | 2016-12-07 | 浙江中控技术股份有限公司 | A kind of IO control system |
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Open date: 20100317 |