CN101546901B - Circuit protection device for building automation system - Google Patents
Circuit protection device for building automation system Download PDFInfo
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- CN101546901B CN101546901B CN200910083652A CN200910083652A CN101546901B CN 101546901 B CN101546901 B CN 101546901B CN 200910083652 A CN200910083652 A CN 200910083652A CN 200910083652 A CN200910083652 A CN 200910083652A CN 101546901 B CN101546901 B CN 101546901B
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- transient voltage
- protective tube
- building
- voltage restraining
- restraining diode
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Abstract
The invention discloses a circuit protection device for a building automation system. Each input lead of a building automation device is connected with a first protective tube and a first transient voltage suppressor; a second protective tube and a second transient voltage suppressor are connected in series between an input field and a protected field of an external device; the first protective tube is connected with the first transient voltage suppressor and the input lead of the building automation device; the other end of the first transient voltage suppressor is connected with the second protective tube, the second transient voltage suppressor and a reference field of the building automation device; and the other end of the second transient voltage suppressor is connected with the protected field. The technical proposal adopted not only can protect the safety of the building automation device and utilize derived circuits to protect the safety of communication cables of the building automation system, but also has simple and convenient operation and can be quickly overhauled.
Description
Technical field
The present invention relates to building automatic control technology field, relate in particular to a kind of circuit protection device of automatic building control system.
Background technology
Automatic building control system is used more extensive; All control like the air-conditioning in common office and the meeting building, blower fan, light by automatic building control system; These equipment generally also have some expansion modules to form by network controller, direct digital controller (being called for short DDC); Realize the intellectualized operation management through central control room, its value ratio is expensive.
Automatic building control system external circuit in practical application is a lot, the analog quantity line that transducer is arranged of input signal, the digital quantity line is arranged, the stem grafting dotted line is arranged, analog quantity output line, relay output line are arranged, the also having controllable silicon output line, connection or the like of output.Very numerous and disorderly after these lines pick out, specification requirement is high, and installation difficulty is big, and the misconnection situation is often arranged, in case the wrong instantaneous time makes the building automatic control equipment burn.And these equipment are all linked together by lead; There is an equipment to be introduced into high voltage and will burns a string equipment,, add that the staff pulls down equipment to the scene except the expense of repairing facility; Install the freight of equipment and equipment after fixing again; Add the duration of delaying,, need propose a kind of protective device of automatic building control system of safe and applicable at present really so suffer heavy losses.
Summary of the invention
The objective of the invention is to propose a kind of circuit protection device of automatic building control system, can be under the situation of input above operating voltage that allows or incoming line misconnection, Zapping circuit keeps the safety of automatic building control system.
For reaching this purpose, the present invention adopts following technical scheme:
A kind of circuit protection device of automatic building control system; Comprise and be no less than two protective tubes and be no less than two transient voltage restraining diodes; Wherein, Connecting one first protective tube and one first transient voltage restraining diode on the every input lead in the building automatic control equipment, one second protective tube of serial connection and one second transient voltage restraining diode between the input ground of external equipment and the protection ground
First protective tube is connected with the first transient voltage restraining diode, and is connected with building automatic control equipment input lead,
The other end of the first transient voltage restraining diode is connected with second protective tube, the second transient voltage restraining diode, and is connected with the reference ground of building automatic control equipment,
The other end of the second transient voltage restraining diode is connected on protection on the ground.
Two input leads are arranged in automatic building control system, comprise one first transient voltage restraining diode, the first transient voltage restraining diode is connected between two input leads.
Said protective tube is common protective tube.
Said transient voltage restraining diode is to exchange the transient voltage restraining diode.
Also comprise electric capacity, said electric capacity is connected to protection ground, is used for anti-interference.
Adopted technical scheme of the present invention; Not only can protect the safety of automatic building control system; And easy operation, can overhaul fast, can also accomplish the circuit switch function simultaneously; Circuit, such as 4～20mA becomes the change-over circuit of two circuit, bleeder circuit, and the function of relay output is arranged.
Description of drawings
Fig. 1 is the structural representation of circuit protection device in the specific embodiment of the invention one.
Fig. 2 is the structural representation of circuit protection device in the specific embodiment of the invention two.
Embodiment
Further specify technical scheme of the present invention below in conjunction with accompanying drawing and through embodiment.
Technological thought of the present invention is the general insurance pipe that adds a transient voltage restraining diode (TVS) and a low capacity at every input lead of building automatic control equipment; The general insurance pipe of a low capacity of the input of external apparatus ground string again; Use transient voltage restraining diode (TVS) to receive protection on the ground again, just reached the purpose of protection building automatic control equipments.
This circuit protection device comprises protective tube, transient voltage restraining diode; Wherein connecting one first protective tube and one first transient voltage restraining diode on the every input lead in the building automatic control equipment; One second protective tube of serial connection and one second transient voltage restraining diode between the input ground of external equipment and the protection ground; First protective tube is connected with the first transient voltage restraining diode; And be connected with building automatic control equipment input lead; The other end of the first transient voltage restraining diode is connected with second protective tube, the second transient voltage restraining diode, and is connected with the reference ground of building automatic control equipment, and the other end of the second transient voltage restraining diode is connected on protection on the ground.
What shield is TVS pipe and general insurance pipe; The effect of TVS pipe is: its working impedance is reduced to very low conduction value immediately when it bears a high-octane instantaneous overvoltage pulse; The surge current of its permission can reach 50～100A under T=25 ℃, t=10ms condition.General, in order to prevent pulse spike,, just played the effect of not burnt at the input access TVS of circuit pipe by high voltage by protective circuit if be used with a general insurance pipe.
For example: we will protect the circuit of 5V; Choose the TVS pipe of protection 5V circuit, connect the protective tube of a common 0.1A again, the protective tube of common 0.1A fuses immediately when at outside line input access 12V, 24V, 220V; Test successively by protection equipment, protected Plant in good condition harmless.The TVS pipe adopts when exchanging the transient voltage restraining diode, and alternating current-direct current all can play a protective role.
Fig. 1 is the structural representation of circuit protection device in the specific embodiment of the invention one.As shown in Figure 1; In this execution mode, select common protective tube F1, protective tube F2 for use, and select for use the protection 5V interchange transient voltage restraining diode TVS1 with exchange transient voltage restraining diode TVS2; The protective tube F1 here is exactly first protective tube; Protective tube F2 is exactly second protective tube, and exchanging transient voltage restraining diode TVS1 is exactly the first transient voltage restraining diode, and exchanging transient voltage restraining diode TVS2 is exactly the second transient voltage restraining diode.
The operating voltage (VCC) of general automatic building control system is 5V, is a simulated measurement input circuit among the figure, and digital input circuit is similar in it, and the output circuit operating voltage of imitated output quantity generally is 24V, and at this moment the TVS pipe is selected protection 24V's for use.Here there is two states:
A kind of state is to be connected on general insurance pipe F1 end when live wire (LIVE WIRE), and when zero line (NEUTRAL WIRE) was connected on general insurance pipe F2 end, this moment, input voltage was higher than the protection voltage of TVS1, moment TVS1 conducting, and protective tube F1 or protective tube F2 burn.Divide two kinds of situation:
(1) if F1 burns earlier, the live wire of access arrangement (LIVE WIRE) breaks off, the protection of zero line (NEUTRALWIRE) and equipment equipotential, whether burn during F2 that it doesn't matter.Even burnt; Perhaps be that protective tube F2 and protective tube F1 burn simultaneously; Perhaps zero line (NEUTRAL WIRE) and protection ground are not equipotentials, and the circuit that protective tube F2 one burns the protection ground wire (place of working) of building automatic control equipment wiring board has also played protective effect.
(2) if protective tube F2 burns earlier, because the end of TVS1 is connected on the protective tube F1, the other end is that the protection ground with equipment is connected together, and owing to TVS1 moment conducting, protective tube F1 also burns immediately, like this circuit has been played protective effect.
Another kind of state is worked as live wire (LIVE WIRE) and is connected on protective tube F2, and zero line (NEUTRAL WIRE) also divides two kinds of situation when being connected on protective tube F1:
(1) when live wire (LIVE WIRE) when being connected on protective tube F2; Be connected together owing to the place of working of building automatic control equipment wiring board with to the protection ground wire; Protective tube F2 blows immediately, and the circuit of the protection ground wire (place of working) of building automatic control equipment wiring board has been played protective effect.If the floating ground of building automatic control equipment, TVS2 has play and has acted on conducting immediately, and protective tube F2 blows immediately, and the building automatic control equipment has been played protective effect again.
(2) zero line (NEUTRAL WIRE) is when being connected on protective tube F1; It is and the protection of equipment ground equipotential; Whether protective tube F1 burns that it doesn't matter, has burnt, and perhaps zero line (NEUTRAL WIRE) and protection ground are not equipotentials; Perhaps burn simultaneously with protective tube F2, the circuit to the protection ground wire (place of working) of the components and parts of building equipment and wiring board has equally also played protective effect like this.
If it is the same with above-described two states that single line live wire (LIVE WIRE) or zero line (NEUTRAL WIRE) are received the input or the protection ground end of building automatic control equipment.
If, that is to say that discord protection ground, place of working is connected together, when the voltage of the input access of F2 when by the place of working of protection equipment being floating ground; When being higher than the operating voltage of TVS2 pipe; TVS2 manages conducting, and protective tube F2 burns, and has protected so again by protection equipment.
Fig. 2 is the structural representation of circuit protection device in the specific embodiment of the invention two.As shown in Figure 2; In this execution mode, be the same, only manage to having added a TVS3 between the protection ground at connection A to the operation principle of the circuit protection device among the protection of RS485 communication line and Fig. 1; The TVS4 pipe is exactly the protection tube of the screen of connection; Just on the RS485 connection, connect four TVS pipes, the protective tube of three common 0.1A is protected the equipment that inserts on the RS485 connection equally.
The equipment end of general RS485 connection; The Shielded Twisted Pair screen connects receives protection after the little capacitor C on the ground again; That is anti-interference usefulness, and when common protective tube F3 termination went into to exceed the operating voltage of TVS4 pipe, TVS4 managed conducting; Protective tube F3 burns, and has protected so again by the anti-interference capacitor C of protection equipment.
The circuit protection device of automatic building control system also has the circuit switch function, and for example: the circuit of 4～20mA, becomes the change-over circuit of two circuit, bleeder circuit, and the function of relay output.
The above; Be merely the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with this technological people in the technical scope that the present invention disclosed; The variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (5)
1. the circuit protection device of an automatic building control system; It is characterized in that; Comprise being no less than two protective tubes and being no less than two transient voltage restraining diodes, wherein, connecting one first protective tube and one first transient voltage restraining diode on the every input lead in the building automatic control equipment; One second protective tube of serial connection and one second transient voltage restraining diode between the input ground of external equipment and the protection ground
First protective tube is connected with the first transient voltage restraining diode, and is connected with building automatic control equipment input lead,
The other end of the first transient voltage restraining diode is connected with second protective tube, the second transient voltage restraining diode, and is connected with the reference ground of building automatic control equipment,
The other end of the second transient voltage restraining diode is connected on protection on the ground.
2. the circuit protection device of a kind of automatic building control system according to claim 1; It is characterized in that; Two input leads are arranged in the building automatic control equipment, also comprise one first transient voltage restraining diode, the first transient voltage restraining diode is connected between two input leads.
3. the circuit protection device of a kind of automatic building control system according to claim 1 is characterized in that, said protective tube is common protective tube.
4. the circuit protection device of a kind of automatic building control system according to claim 1 is characterized in that, said transient voltage restraining diode is to exchange the transient voltage restraining diode.
5. the circuit protection device of a kind of automatic building control system according to claim 2 is characterized in that, also comprises electric capacity, and said electric capacity is connected to protection ground, is used for anti-interference.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910083652A CN101546901B (en) | 2009-05-07 | 2009-05-07 | Circuit protection device for building automation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910083652A CN101546901B (en) | 2009-05-07 | 2009-05-07 | Circuit protection device for building automation system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101546901A CN101546901A (en) | 2009-09-30 |
| CN101546901B true CN101546901B (en) | 2012-09-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910083652A Expired - Fee Related CN101546901B (en) | 2009-05-07 | 2009-05-07 | Circuit protection device for building automation system |
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| CN (1) | CN101546901B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1649228A (en) * | 2005-01-14 | 2005-08-03 | 艾默生网络能源系统有限公司 | Signal lightning protection circuit |
| CN1829033A (en) * | 2005-03-04 | 2006-09-06 | 昆山双桥传感器测控技术有限公司 | Lightningproof circuit and immersion type piezoresistance liquid level transmitter with the same |
-
2009
- 2009-05-07 CN CN200910083652A patent/CN101546901B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1649228A (en) * | 2005-01-14 | 2005-08-03 | 艾默生网络能源系统有限公司 | Signal lightning protection circuit |
| CN1829033A (en) * | 2005-03-04 | 2006-09-06 | 昆山双桥传感器测控技术有限公司 | Lightningproof circuit and immersion type piezoresistance liquid level transmitter with the same |
Non-Patent Citations (2)
| Title |
|---|
| 叶志琼.《瞬变电压抑制器在电源净化技术中的应用》.《电气时代》.2004,(第8期),130，132. * |
| 李定宣.《瞬态电压抑制器及其应用》.《电气时代》.2000,(第2期),28-29. * |
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| Publication number | Publication date |
|---|---|
| CN101546901A (en) | 2009-09-30 |
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