CN201594735U - Control device for preventing damage of influence mine - Google Patents
Control device for preventing damage of influence mine Download PDFInfo
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- CN201594735U CN201594735U CN2009203522027U CN200920352202U CN201594735U CN 201594735 U CN201594735 U CN 201594735U CN 2009203522027 U CN2009203522027 U CN 2009203522027U CN 200920352202 U CN200920352202 U CN 200920352202U CN 201594735 U CN201594735 U CN 201594735U
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- power supply
- piezo
- resistance
- control power
- control
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Abstract
The utility model provides a control device for preventing damage of influence mine. The control device comprises a control power supply and a piezoresistor, wherein the piezoresistor is connected with the control power supply in parallel. The sensitive voltage is greater than the output voltage of the control power supply. The utility model can effectively prevent the on-site equipment on the power supply lines from being damaged by influence mine.
Description
Technical field
The utility model relates to a kind of control device, particularly, relates to a kind of control device of pre-anti-induction thunder infringement.
Background technology
For building, enough pay attention to for anti-lightning strike needs.
Thunder and lightning is the electric discharge phenomena in the atmosphere, is formed in the cumulonimbus more, and cumulonimbus is along with the variation meeting of air temperature and current is ceaselessly moved, and during movement frictional electricity has just formed charged cloud layer.Some cloud layer has positive charge, and other cloud layers have negative electrical charge.In addition, because electrostatic induction, and usually make building below the cloud layer, trees etc. have the charges of different polarity.Along with the accumulation of electric charge, the voltage of cloud layer raises gradually.When the cloud layer that has different electric charges and the earth ridge are close to certain distance mutually, produce huge electric field (for example surpassing 25-30kv/cm) therebetween, thereby fierce discharge takes place, produce strong flash of light simultaneously.Because extreme temperatures (even up to 2000 ℃) during discharge, air are heated and are sharply expanded, the roar of thereupon blasting, thus formed lightning and thunderous.
The thunderbolt of occurring in nature is divided into direct lightning strike and induction thunder.Air direct expanded by heating and send roar under strong electric field, this is a direct lightning strike, everyone knows about it.The induction thunder then is because the electromagnetic induction effect the when electrostatic induction of thundercloud or discharge makes the metal object line of building induce the electric charge opposite with thundercloud, and takes place silently, thereby is difficult for being discovered.
As a kind of building that is subject to be struck by lightning, the stacker at harbour generally all will be taked anti-lightning strike measure, mainly is that lightning rod, downlead and earthing device are installed on stacker.
Lightning rod utilizes it to exceed the prominent position of protected object, and thunder and lightning is guided into self, by downlead and earthing device thunder-strike current is introduced the earth then, protects stacker to exempt from thunderbolt with this.The sudden strain of a muscle effect that connects of lightning rod is general only highly relevant with it, and irrelevant with its profile, so the lightning rod of selecting for use is not must be the aciculiform that point goes out.But, adopt lightning rod to have major hidden danger.If downlead fracture or earthing device contact resistance are too big, the thunder-strike current that lightning rod bears just can't be introduced the earth.In the case, lightning rod can't lightning protection, but attracting thunder and lightning, has increased the thunderstruck chance of stacker on the contrary.Therefore, downlead all requires high to mechanical strength, corrosion resistance and thermal stability.
In the earthing device of stacker, resistance is not too much, generally must not be greater than 10 ohm.
Above-mentioned arrester device can effectively prevent direct lightning strike, but is difficult to avoid responding to thunder.Lightning rod is bearing when thunderbolt, and downlead and earthing device all present very high surge voltage, may puncture and adjacent cables between insulation, produce violent discharge, be called " counterattack " in this area.Because counterattack may cause high voltage to invade cable, cause that control appliance damages, even may cause personal injury.In order to prevent counterattack, must guarantee has enough safe distances (for example 5-10cm) between lightning rod, downlead, earthing device and the adjacent cables.
But, only take above-mentioned measure to be nowhere near.In practice, designed system still frequently is subjected to thunderbolt destruction like this, and is especially even more serious at control section.
Current lightning rod system often only considers direct lightning strike, and does not consider to respond to thunder.And along with the stacker system becomes increasingly complex, the induction thunder in the thunder and lightning weather is higher to the attack probability of this type of " light current " system.Because most of control modules, encoder, decoder all are by the integrated circuit (IC) chip operation.Voltage was between 5 volts to 24 volts when chip normally moved, operating personnel even will eliminate on one's body static and just can operate.If there is not perfect lightning-protection system, then remote outside the thundering of (even outside 1 kilometer), can both make these " light current " systems sense surge current, suffer indirect lightning strike.Integrated circuit often costs an arm and a leg, repairs difficulty, if impaired owing to respond to thunder, often brings about great losses.
Therefore, press for a kind of device in this area and effectively prevent to respond to the destruction that thunder causes.
The utility model content
The utility model provides a kind of control circuit of pre-anti-induction thunder infringement, has solved defective of the prior art effectively.
A kind of control device of pre-anti-induction thunder infringement comprises: the control power supply; With control power supply piezo-resistance in parallel, the pressure sensitive voltage of this piezo-resistance is greater than the output voltage of control power supply.
Preferably, described control power supply is a DC control supply.
Preferably, described control power supply is an ac control power supply.
More preferably, described field apparatus is an encoder.
More preferably, described field apparatus is a relay.
Preferably, described control circuit also comprises high speed counting module, described control power supply is a plurality of control power supplys, described piezo-resistance is a plurality of piezo-resistances, described limit field apparatus is a plurality of field apparatuss, the described a plurality of field apparatus power supply of respectively doing for oneself of described a plurality of control power supply, described high speed counting module connects a plurality of holding wires of a plurality of encoders respectively, makes in described a plurality of holding wire each in parallel with piezo-resistance.
More preferably, described a plurality of field apparatus is walking encoder, pitching encoder, rotary encoder.
Preferably, described piezo-resistance is the metal-oxide semiconductor (MOS) rheostat.
The utility model prevents effectively that by the above control circuit that prevents to respond to thunder is provided the field apparatus in the supply line is subjected to responding to the thunder damage.
Description of drawings
Fig. 1 illustrates the volt-ampere characteristic figure of piezo-resistance;
Fig. 2 illustrates the circuit diagram that comprises piezo-resistance according to the utility model first embodiment;
Fig. 3 illustrates the circuit diagram that comprises piezo-resistance according to the utility model second embodiment;
Fig. 4 illustrates according to the piezo-resistance of passing through of third embodiment of the invention a plurality of encoders and high speed counting module is carried out protective circuit figure.
Embodiment
Hereinafter, identical Reference numeral refers to components identical.
Above mention, in order to prevent that responding to thunder causes damage to " light current " control system, should make control circuit away from the facility that bears direct lightning strike, arrester device for example mentioned above.
Except taking above-mentioned measure, the utility model also adopts piezo-resistance to prevent effectively because the infringement that the induction thunder causes.Piezo-resistance has unique voltage-current characteristic.
Fig. 1 illustrates the volt-ampere characteristic figure of piezo-resistance.As shown in Figure 1, the volt-ampere characteristic of piezo-resistance is the nonlinear curve of a symmetry.When applied voltage is low; electric current by piezo-resistance is very little; piezo-resistance is high-impedance state (this state is also referred to as " ending " state in the art); and when applied voltage meets or exceeds pressure sensitive voltage; the resistance of piezo-resistance sharply descends and conducting rapidly; its operating current can increase several magnitude (this state is called " puncture " in the art), thereby exist together other circuit elements of a circuit of protection and piezo-resistance can not damage because of overvoltage effectively.
The piezo-resistance that the utility model adopted comprises metal-oxide semiconductor (MOS) rheostat (MOV), and its advantage is that the response time is fast, discharge capacity is big.
According to the utility model, control power supply control field apparatus, not impaired for the equipment of keeping the scene intact because of the induction thunder, make the control power supply be parallel with a piezo-resistance.
When control power supply operate as normal, the control power source voltage is not enough to puncture piezo-resistance, therefore makes piezo-resistance be in high-impedance state, that is, and and cut-off state.In the case, the existence of piezo-resistance does not produce any influence to the operation of field apparatus.
If the control power supply is responded to thunder and output voltage moment is increased, then when this output voltage surpasses the pressure sensitive voltage of piezo-resistance, voltage-current characteristic according to piezo-resistance mentioned above, the resistance of piezo-resistance sharply descends and is breakdown rapidly, thereby the voltage that moment increases in the control power supply is discharged by piezo-resistance.In the case, the suffered voltage of field apparatus is equivalent to the pressure sensitive voltage of piezo-resistance, thereby the voltage limit that will be in the field apparatus in the supply line has protected field apparatus to make it avoid damaging in the scope of safety effectively.After induction thunder phenomenon disappeared, the control power source voltage returned to original level, makes piezo-resistance return to cut-off state once more, and the control power supply is powered to the field apparatus in the supply line again.
Fig. 2 illustrates the circuit diagram that comprises piezo-resistance according to the utility model first embodiment.Wherein, ac control power supply 201 is controlled pull switch 203 and the disconnecting relay 204 that is connected in series.Piezo-resistance 202 is in parallel with ac control power supply 201.
For example, the effective voltage of ac control power supply 201 outputs can be 110 volts, and crest voltage is ± 155.54 volts.The pressure sensitive voltage of piezo-resistance 202 can be set at 180 volts.When ac control power supply 201 operate as normal, because the crest voltage of ac control power supply 201 is less than pressure sensitive voltage, so piezo-resistance 202 is in cut-off state, and ac control power supply 201 can normally be that pull switch 203 and disconnecting relay 204 are powered.And if ac control power supply 201 is because the influence of induction thunder and crest voltage moment increases to above pressure sensitive voltage (for example 180 volts), then piezo-resistance 202 is breakdown, high voltage owing to the ac control power supply that forms of influence 201 outputs of induction thunder also discharges by piezo-resistance 202 rapidly so, and this moment, pull switch 203 and disconnecting relay 204 were worked under the voltage that is no more than pressure sensitive voltage (for example 180 volts).Therefore, the suffered voltage of pull switch 203 and disconnecting relay 204 still in the scope of safety, thereby can be not impaired.After the induction thunder, piezo-resistance 202 is recovered cut-off state, and the control power supply still can normally be pull switch 203 and disconnecting relay 204 power supplies.
Fig. 3 illustrates the circuit diagram that comprises pressure sensitive voltage according to the utility model second embodiment.Wherein, DC control supply 301 is encoder 303 power supplies of field apparatus.Piezo-resistance 302 is in parallel with DC control supply 301.
For example, DC control supply 301 output voltages are 24 volts, and the pressure sensitive voltage of piezo-resistance 302 is 30 volts.When DC control supply 301 was encoder 303 power supply under normal condition, because the output voltage of DC control supply 301 is less than pressure sensitive voltage, so piezo-resistance 302 was in cut-off state, do not influence the normal operation of encoder 303.Make output voltage moment rising if DC control supply 301 is subjected to responding to the influence of thunder and be higher than pressure sensitive voltage (for example 30 volts), then piezo-resistance 302 is breakdown, this moment, encoder 303 just was under the pressure sensitive voltage (for example 30 volts), suffered voltage therefore can be not impaired still in safe range.After the induction thunder, piezo-resistance 302 reverts to cut-off state again, and ac control power supply 301 still carries out normal power supply to encoder 303.
Fig. 4 illustrates the circuit diagram that piezo-resistance is protected 3 encoders and high speed counting module that passes through according to third embodiment of the invention.
As shown in Figure 4, high speed counting module 400 has 4 passages, and three passages shown in the figure are respectively passage 401,402,403, and each passage connects four holding wires of an encoder, promptly
A1, AN, B1, BN, the holding wire of encoder provides pulse signal to high speed counting module, quantity and the phase relation of A1, the B1 direction of rotation and the position that draw encoder of high speed counting module by pulse signal, thereby the position data of drawing.The holding wire of walking encoder 405, pitching encoder 406, rotary encoder 407 is connected respectively to the passage 401,402,403. of high speed counting module 400
Being connected to passage 401 with walking encoder 405 is example, when 405 are subjected to indirect lightning strike at the scene, the A1 of encoder, encoder, AN, four holding wires of B1, BN, high speed counting module all bear lightning induced voltage, at this moment be connected to four piezo-resistances on four holding wires with voltage clamp at pressure sensitive voltage, assurance equipment is not destroyed by overvoltage.
It will be appreciated by persons skilled in the art that the utility model is not limited to each embodiment mentioned above, the technical scheme that all and the foregoing description are equal to all drops in the protection range of the present utility model.
Claims (8)
1. the control device of a pre-anti-induction thunder infringement is characterized in that, comprising:
The control power supply;
With control power supply piezo-resistance in parallel, the pressure sensitive voltage of this piezo-resistance is greater than the output voltage of control power supply.
2. control device according to claim 1 is characterized in that, described control power supply is a DC control supply.
3. control device according to claim 1 is characterized in that, described control power supply is an ac control power supply.
4. control device according to claim 2 is characterized in that, described field apparatus is an encoder.
5. control device according to claim 3 is characterized in that, described field apparatus is a relay.
6. control device according to claim 1, it is characterized in that, described control circuit also comprises high speed counting module, described control power supply is a plurality of control power supplys, described piezo-resistance is a plurality of piezo-resistances, and described field apparatus is a plurality of field apparatuss, the described a plurality of field apparatus power supply of respectively doing for oneself of described a plurality of control power supplys, described high speed counting module connects a plurality of holding wires of a plurality of encoders respectively, makes in described a plurality of holding wire each in parallel with piezo-resistance.
7. control device according to claim 6 is characterized in that, described a plurality of field apparatuss are walking encoder, pitching encoder, rotary encoder.
8. control device according to claim 1 is characterized in that, described piezo-resistance is the metal-oxide semiconductor (MOS) rheostat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203522027U CN201594735U (en) | 2009-12-30 | 2009-12-30 | Control device for preventing damage of influence mine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203522027U CN201594735U (en) | 2009-12-30 | 2009-12-30 | Control device for preventing damage of influence mine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201594735U true CN201594735U (en) | 2010-09-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009203522027U Expired - Lifetime CN201594735U (en) | 2009-12-30 | 2009-12-30 | Control device for preventing damage of influence mine |
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| Country | Link |
|---|---|
| CN (1) | CN201594735U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102118025A (en) * | 2009-12-30 | 2011-07-06 | 中国神华能源股份有限公司 | Controller for preventing inductive lightning damage |
-
2009
- 2009-12-30 CN CN2009203522027U patent/CN201594735U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102118025A (en) * | 2009-12-30 | 2011-07-06 | 中国神华能源股份有限公司 | Controller for preventing inductive lightning damage |
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| Date | Code | Title | Description |
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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: 20100929 |