CN204925295U - Control point survey circuit and equipment ground measurement system - Google Patents
Control point survey circuit and equipment ground measurement system Download PDFInfo
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- CN204925295U CN204925295U CN201520570774.8U CN201520570774U CN204925295U CN 204925295 U CN204925295 U CN 204925295U CN 201520570774 U CN201520570774 U CN 201520570774U CN 204925295 U CN204925295 U CN 204925295U
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Abstract
The utility model provides a control point survey circuit and equipment ground measurement system, this kind of control point survey circuit includes: relatively module, output control module and output module wherein, relatively include comparison circuit at least all the way in the module, and every way comparison circuit is configured as and carries out the voltage between the control point comparison and export a level signal with presupposition voltage, including at least one input among the output control module, and every input is connected with comparison circuit's output all the way, output control module be configured as with a received level signal be adjusted into with the 2nd level signal of output module matching, output module's input is connected with output control module's output, and output module is configured as the 2nd level signal of response output control module output, and it awaits measuring impedance and the standard resistance of grouding device ground connection through the collection and goes the comparison, provides the signal for the buzzer, when having ensured operator's personal safety like this, has protected the safety of product and equipment.
Description
Technical field
The utility model relates to electronic technology field, particularly relates to a kind of control point survey circuit and equipment ground measuring system.
Background technology
Along with the development of science and technology, automation equipment is applied more and more extensive in the process manufactured, we know, in the process used, in order to ensure the safety of automated production equipment, all need equipment ground, by the metal shell of equipment, uncharged metal parts utilizes wire to be connected with the earth under normal circumstances, make metal shell, metal parts keeps same current potential with the earth, like this when equipment breaks down, metal shell, the leakage current of metal parts just can import the earth smoothly, even if people touches the danger that these parts do not have electric shock yet.
FCT (FunctionalCircuitTest, functional test) testing station equipment is exactly such a automation equipment, and it is directly connected to the earth by wire in the process used.But; although existing testing station equipment has carried out ground protection in the process used; but can not the be real-time Grounding of equipment be monitored; like this; when the ground connection of equipment there occurs fault; operator can not know timely, the serious consequence such as can bring destroy product, infringement equipment and harmful to human safely.
Utility model content
For the problems referred to above, the utility model aims to provide a kind of control point survey circuit and equipment ground measuring system, in utilizing this control point survey circuit to system in this equipment ground test macro, each earth point carries out real-time monitoring, ensures product safety, device security and human-body safety.
A kind of control point survey circuit, comprises at described control point survey circuit: comparison module, output control module and output module, wherein,
Described comparison module comprises at least one road comparator circuit, and the voltage between comparator circuit described in every road is configured to reference mark and predeterminated voltage compare and export the first level signal;
Described output control module comprises at least one input end, and each described input end is connected with the output terminal of comparator circuit described in a road, described output control module is configured to described first level signal received to be adjusted to the second electrical level signal mated with described output module;
The input end of described output module is connected with the output terminal of described output control module, and described output module is configured to the second electrical level signal responding the output of described output control module.
In the technical program, in comparison module, if the voltage ratio predeterminated voltage between reference mark is high, then the first level signal exported is high level (namely 1), voltage ratio predeterminated voltage between reference mark is low, then the first level signal exported is low level (namely 0).In the output module, when the second electrical level signal of input is low level, then devices illustrated ground connection is broken down, if the second electrical level of input is high level, then devices illustrated ground connection is good.Why say that output control module is for the first level signal being adjusted to the second electrical level signal mated with output module, be because, in comparison module, only have the voltage ratio predeterminated voltage in circuit between reference mark low, namely the first level signal is that in low level situation, devices illustrated is that ground connection is normal; But in the output module, the second electrical level signal received is only normally when being high level, so intermediate demand is converted to second electrical level signal and outputs to output module by output control module receiving the first level signal obtained, to meet the demand of circuit design.
Preferably, described in every road, comparator circuit comprises: the first resistance, the second resistance, the 3rd resistance, testing resistance, comparer, the first power supply and second source, wherein,
The first end of described first resistance is connected with described first power supply, the second end is connected with the first end of described second resistance and the negative input end of described comparer respectively; Second end ground connection of described second resistance; The first end of described 3rd resistance is connected with described second source, the second end is connected with the first end of described testing resistance and the positive input terminal of described comparer respectively; Second end ground connection of described testing resistance; The output terminal of described comparer is connected with the input end of described output control module;
The voltage at the voltage at described testing resistance two ends and described second resistance two ends is compared output first level signal by comparator circuit described in every road.
In the technical program, can find out, the voltage (being the voltage between previously described reference mark) at testing resistance two ends and the voltage (i.e. predeterminated voltage) at the second resistance two ends are depended in the output of comparer, and the voltage at testing resistance two ends depends on ratio and the second source of testing resistance/(testing resistance+the three resistance), the voltage at the second resistance two ends depends on ratio and first power supply of the second resistance/(the first resistance+the second resistance), if the voltage at testing resistance two ends is greater than the voltage at the second resistance two ends, then comparer exports high level, if the voltage at testing resistance two ends is less than the voltage at the second resistance two ends, then comparer output low level, like this, in actual applications, whether ground connection is good can to know equipment by the resistance value of monitoring testing resistance, realize the enforcement monitoring treating grounding apparatus Grounding to be measured.
Preferably, described output control module comprises at least one rejection gate, and the input end of described rejection gate is connected with the output terminal of described comparator circuit;
When the quantity of comparator circuit described in described comparison module is even number, the output terminal of comparator circuit described in Ze Mei road connects an input end in a described rejection gate; When the quantity of comparator circuit described in described comparison module is odd number, the output terminal of comparator circuit described in Ze Mei road connects an input end in a described rejection gate, and the input end grounding of the rejection gate be not connected with described comparator circuit.
In the technical program, here, in order to realize real-time earthing monitoring to multiple equipment simultaneously, we arrange multichannel comparator circuit in comparison module, again in order to obtain output first level signal of every road comparator circuit, we are provided with at least one rejection gate in output control module.We know, under normal circumstances, a rejection gate comprises two input ends, that is just can connect the output terminal of two-way comparator circuit in a rejection gate.Like this, in a practical situation, a kind of situation will certainly be there is, when not needing to carry out grounding monitor to multiple grounding apparatus to be measured, the quantity that just there will be the input end (input end namely in rejection gate) in output control module is greater than the situation of the quantity of comparator circuit, or the quantity just as above-mentioned comparator circuit is odd number, now, that meeting pin is unsettled certainly in rejection gate, in order to the pin not allowing these unsettled affects the Output rusults of whole control point survey circuit, we are by these unsettled pin groundings.
Preferably, described output control module comprises multiple described rejection gate and at least one and door;
The output terminal of every two described rejection gates is connected with the input end of door with described in one, is connected described in every two with the output terminal of door with the 3rd with the input end of door.
Preferably, described output control module comprises the first rejection gate, the second rejection gate, the 3rd rejection gate, four nor gate, first and door, second and door and the 3rd and door, and described comparison module comprises No. eight comparator circuits, wherein,
Described first rejection gate, second rejection gate, eight input ends of the 3rd rejection gate and four nor gate connect one to one with eight output terminals of No. eight comparator circuits respectively, described first rejection gate is connected with two input ends of door with described first respectively with the output terminal of the second rejection gate, described 3rd rejection gate is connected with two input ends of door with described second respectively with the output terminal of four nor gate, described first is connected with the input end of door with the 3rd with the output terminal of door respectively with door and described second, described 3rd is connected with the input end of described output module with the output terminal of door.
Preferably, also comprise multiple state display lamp in described control point survey circuit, each described state display lamp is connected with the output terminal of a described comparator circuit respectively.
Preferably, described output module comprises a hummer and a relay, and described hummer is connected with the output terminal of described output control module respectively with the input end of described relay.
Preferably, also isolation module is comprised in described control point survey circuit, described isolation module is arranged between described output control module and described output module, the input end of described isolation module is connected with the output terminal of described output control module, and the output terminal of described isolation module is connected with the input end of described output module;
Described isolation module comprises the first phase inverter and second phase inverter of series connection mutually, and the input end of described first phase inverter is connected with the output terminal of described output control module, output terminal is connected with the input end of described second phase inverter; The output terminal of described second phase inverter is connected with the input end of described output module.
In the technical program, isolation module is here made up of two phase inverters, and it is except for keeping apart output control module and output module, simultaneously for improving the driving force of whole control point survey circuit.
A kind of equipment ground measuring system, described equipment ground measuring system comprises above-mentioned control point survey circuit and at least one grounding apparatus to be measured, and in described control point survey circuit, comparator circuit and described grounding apparatus one_to_one corresponding to be measured are arranged;
An earthmeter loop is formed between comparator circuit, a described grounding apparatus to be measured and equipment ground described in one tunnel.
In the technical program, in theory, grounding apparatus to be measured here can be the automation equipment in use needing ground connection arbitrarily, is widely used.
Preferably, described grounding apparatus to be measured is grounding apparatus in FCT testing station.
The control point survey circuit provided at the utility model and equipment ground measuring system, its beneficial effect is:
In the utility model, go to compare by the impedance (voltages at testing resistance two ends) and measuring resistance (voltages at the second resistance two ends) that gather grounding apparatus ground connection to be measured, provide the signal of acceptance or rejection to hummer, if what give is defective signal, hummer can be reported to the police, prompting operator, equipment ground is defective, and cut off product test point by relay, forbid that equipment continues operation, such ensured operator's personal safety while, protect the safety of product and equipment; And be all provided with state display lamp at the output terminal of control point survey circuit Zhong Mei road comparator circuit, can real-time reminding operator grounding apparatus to be measured whether normal ground;
In addition, the control point survey circuit that the utility model provides can monitor multiple stage grounding apparatus to be measured simultaneously, and when needs are monitored to more grounding apparatus to be measured, can expand arbitrarily; And this control point survey circuit can be monitored in real time to needing arbitrarily the grounding apparatus to be measured carrying out ground connection monitoring, is widely used.
Accompanying drawing explanation
Below by clearly understandable mode, accompanying drawings preferred implementation, is further described above-mentioned characteristic, technical characteristic, advantage and implementation thereof.
The control point survey electrical block diagram that Fig. 1 provides for the utility model;
Fig. 2 is the circuit diagram of comparator circuit in the utility model;
Fig. 3 is the specific embodiment circuit diagram that in the utility model, output control module comprises 4 rejection gates and 3 and door;
Fig. 4 is the control point survey circuit diagram that the utility model comprises isolation module;
Fig. 5 is equipment ground measuring system structural representation in the utility model.
Reference numeral:
100-comparison module, 200-output control module, 300-output module,
U1-first power supply, U2-second source, R1-first resistance, R2-second resistance, R3-the 3rd resistance,
R4-testing resistance, Q1-comparer, H1-first rejection gate, H2-second rejection gate, J-relay,
H3-the 3rd rejection gate, H4-four nor gate, Y1-first and door, Y2-second and door,
Y3-the 3rd and door, F1-first phase inverter, F2-second phase inverter, W-hummer, 1., 2., 3., 4., 5., 6.-reference mark.
Embodiment
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, contrast accompanying drawing is illustrated embodiment of the present utility model below.Apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings, and obtain other embodiment.
Be illustrated in figure 1 the control point survey circuit that the utility model provides, as can be seen from the figure, comprise on this control point survey road: comparison module 100, output control module 200 and output module 300, wherein, the output terminal of comparison module 100 is connected with the input end of output control module 200, and the output terminal of output control module 200 is connected with the input end of output module 300.
Wherein, comparison module 100 comprises at least one road comparator circuit, and the voltage between every road comparator circuit is configured to reference mark and predeterminated voltage compare and export the first level signal.As shown in Figure 2, every road comparator circuit comprises: the first resistance R1, the second resistance R2, the 3rd resistance R3, testing resistance R4, comparer Q1, the first power supply U1 and second source U2, wherein, the first end of the first resistance R1 is connected with the first power supply U1, the second end is connected with the first end of the second resistance R2 and the negative input end of comparer Q1 respectively; The second end ground connection of the second resistance R2; The first end of the 3rd resistance R3 is connected with second source U2, the second end is connected with the first end of testing resistance R4 and the positive input terminal of comparer Q1 respectively; The second end ground connection of testing resistance R4; The output terminal of comparer Q1 is connected with the input end of output control module 200.Know from description above, in comparator circuit, its voltage by testing resistance R4 two ends (voltage namely between above-mentioned reference mark) compares output first level signal with the voltage (i.e. above-mentioned predeterminated voltage) at the second resistance R2 two ends, and when the voltage at testing resistance R4 two ends is greater than the voltage at the second resistance R2 two ends, then comparer Q1 exports high level (namely 1), when the voltage at testing resistance R4 two ends is less than the voltage at the second resistance R2 two ends, then comparer Q1 output low level (namely 0); Again as can be seen from the formation in comparator circuit, the voltage at testing resistance R4 two ends depends on ratio and the second source U2 of testing resistance R4/ (testing resistance R4+ the 3rd resistance R3), and the voltage at the second resistance R2 two ends depends on ratio and the first power supply U1 of the second resistance R2/ (the first resistance R1+ second resistance R2).In a particular embodiment, first power supply U1 and second source U2 is 3.3V (volt) power supply, the resistance of the first resistance R1 is 100K (kilo-ohm), the resistance of the second resistance R2 is 1K, the resistance of the 3rd resistance R3 is 100 Ω (ohms), the model of comparer Q1 is LM324, and in this embodiment, the ratio of the second resistance R2/ (the first resistance R1+ second resistance R2) is 1/ (1+101)=1/101; Resistance due to the 3rd resistance R3 is 100 ohm, therefore when using the Grounding of this comparator circuit to grounding apparatus to be measured to monitor, if the resistance of this testing resistance R4 is greater than 1 Ω, then the voltage of the positive input terminal of comparer Q1 is greater than the voltage of negative input end, and the first level signal that comparer Q1 exports is high level; When the resistance of this testing resistance R4 is less than 1 Ω, then the voltage of the positive input terminal of comparer Q1 is less than the voltage of negative input end, the first level signal that comparer Q1 exports is low level, like this, whether ground connection is good can to know equipment by the resistance value of monitoring testing resistance R4, realizes the Real-Time Monitoring treating grounding apparatus Grounding to be measured.Be noted that, in this embodiment, we are to above-mentioned comparer Q1, the concrete model value of two power supplys and each resistance does not limit, namely in other embodiments, comparer Q1 is all included in content of the present utility model as long as can carry out exporting according to the voltage at the voltage at testing resistance R4 two ends and the second resistance R2 two ends, resistance as the first resistance R1 is 100K (kilo-ohm), the resistance of the second resistance R2 is 1K, 3rd resistance R3 is 300 Ω, first power supply U1 and second source U2 is 3.3V, now then in the process detected, as long as the testing resistance R4 detected and 3 Ω is compared and just can know that whether equipment ground is normal, in simple terms, as long as can according to the first resistance R1, second resistance R2, 3rd resistance R3, first power supply U1, the measurement reference point of the value determination testing resistance R4 of second source U2.
Output control module 200 comprises at least one input end, and each input end is connected with the output terminal of a road comparator circuit, and output control module 200 is configured to the first level signal received to be adjusted to the second electrical level signal mated with output module 300.Specifically, output control module 200 comprises at least one rejection gate, and the input end of rejection gate is connected with the output terminal of comparator circuit, by the input end of rejection gate as the input end of output control module 200.When in comparison module 100, the quantity of comparator circuit is even number, the output terminal of Ze Mei road comparator circuit connects an input end in a rejection gate; When in comparison module 100, the quantity of comparator circuit is odd number, the output terminal of Ze Mei road comparator circuit connects an input end in a rejection gate, and the input end grounding of the rejection gate be not connected with comparator circuit.Be noted that, due in comparison module 100, when voltage ratio predeterminated voltage between testing resistance R4 is low, namely when the first level signal that comparator circuit exports is low level, represent that this grounding apparatus ground connection to be measured is good, and in output module 300, when the second electrical level of input is high level, represent that grounding apparatus ground connection to be measured is good, illustrate that the effect of output control module 200 is in fact that the first level signal negate is obtained second electrical level signal, thus, only have in the embodiment of a road comparator circuit in comparison module 100, rejection gate can not be used in output control module 200 to realize level inversion operation, only needing, a not gate is set between comparison module 100 and output module 300 and just can realize object, if comparison module 100 comprises multichannel comparator circuit certainly, just can not solve simply by adding not gate between comparison module 100 and output module 300, in addition, when this only have a road comparator circuit, divide according to above-described situation, the quantity belonging to comparator circuit is the situation of odd number, one of them output terminal in the output terminal AND OR NOT gate of this comparator circuit connects by this time, and another input end grounding in rejection gate above-mentionedly can realize object equally.Furthermore, when comparison module 100 comprises two-way comparator circuit, can respectively by the output terminal of this two-way comparator circuit respectively two input ends of AND OR NOT gate connect and realize object, here we provide when only having a road or two-way comparator circuit in comparison module 100, adoptable method of attachment in output control module 200.Comparison module 100 is comprised to the situation on multichannel comparator circuit (more than three tunnels), in output control module 200, except comprising multiple rejection gate, also need at least one and door; And the output terminal of every two rejection gates is connected with the input end of door with one respectively, every two are connected with the input end of door with the 3rd respectively with the output terminal of door, the 3rd that is described to is to distinguish with door with two that mention above with door, namely when output control module 200 comprise be 3 multiples with the number of door time, be then that two are connected with two input ends of door with another respectively with the output terminal of door with the connected mode of door.
In a particular embodiment, as shown in Figure 3, output control module 200 comprises the first rejection gate H1, second rejection gate H2, 3rd rejection gate H3, four nor gate H4, first with door Y1, second with door Y2 and the 3rd and door Y3, comparison module 100 comprises No. eight comparator circuits, wherein, first rejection gate H1, second rejection gate H2, eight input ends of the 3rd rejection gate H3 and four nor gate H4 connect one to one with eight output terminals of No. eight comparator circuits respectively, first rejection gate H1 is connected with two input ends of door Y1 with first respectively with the output terminal of the second rejection gate H2, 3rd rejection gate H3 is connected with two input ends of door Y2 with second respectively with the output terminal of four nor gate H4, first is connected with the input end of door Y3 with the 3rd with the output terminal of door Y2 respectively with door Y1 and second, 3rd is connected with the input end of output module 300 with the output terminal of door Y3.What we described above is, when comparison module 100 comprises No. eight comparator circuits, output control module 200 comprises 4 rejection gates and 3 and door, and this control point survey circuit connection of each device in output control module 200 when simultaneously using No. 8 comparator circuits to measure eight grounding apparatuss to be measured, be noted that, this connection is applicable to monitor any one situation in 1-8 grounding apparatus to be measured, as, when only needing to carry out grounding monitor to a band survey grounding apparatus, now comparison module 100 only needs output No. one comparator circuit, and any one in the output terminal of this comparator circuit and 4 rejection gates 8 input ends is connected, again the pin ground connection not accessing comparator circuit in 8 input ends can be realized object, in other embodiments, adopt in the same way, be about to the unsettled pin ground connection not accessing comparator circuit output.Certainly, in the process that output control module 200 is designed, can to the mode of 8 grounding apparatus monitoring to be measured while of might not adopting this, other mode can also be adopted, as output control module 200 comprises 2 rejection gates and one and door, realize simultaneously to 4 grounding apparatus monitoring to be measured; And for example, output control module 200 comprises 8 rejection gates and 6 and door, and realize simultaneously to monitoring of 16 grounding apparatuss to be measured etc., user freely can design according to the demand in practical application, and we are not construed as limiting this.Furthermore, in this embodiment, the chip of 2 input 4 rejection gates that model can be used to be 74LS02 realizes the connection between each rejection gate, 2 inputs 4 using model to be 74LS08 and the chip of door realize the connection between each and door, certainly, also can use the chip of other models to realize, we do not limit it.
The input end of output module 300 is connected with the output terminal of output control module 200, and output module 300 is configured to the second electrical level signal responding output control module 200 output.In a particular embodiment, output module 300 comprises a hummer W and a relay J, hummer W is connected with the output terminal of output control module 200 respectively with the input end of relay J, when the second electrical level signal of input/output module 300 is high level, then illustrate that this grounding apparatus ground connection to be measured is good; If when second electrical level signal is low level, then illustrate that grounding apparatus appears in grounding apparatus to be measured, now hummer W reports to the police, prompting operator grounding apparatus outlet to be measured fault, relay J disconnects the working point of grounding apparatus to be measured simultaneously, allows grounding apparatus to be measured quit work.Certainly, this hummer W, except being connected with the output terminal of output control module 200, also needs to be connected with power supply VCC.
In a specific embodiment, also comprise multiple state display lamp in control point survey circuit, each state display lamp is connected with the output terminal of a comparator circuit respectively (being namely connected with each input end in output control module 200 respectively).When grounding apparatus ground connection to be measured is good, what namely comparator circuit exported is low level, then this state display lamp normally shows; When situation appears in grounding apparatus ground connection to be measured, what namely corresponding with it comparator circuit exported is high level, then the state display lamp of its correspondence extinguishes, and reminds operator.
In another is specifically implemented, also isolation module is comprised in control point survey circuit, isolation module is arranged between output control module 200 and output module 300, the input end of isolation module is connected with the output terminal of output control module 200, and the output terminal of isolation module is connected with the input end of output module 300.Specifically, isolation module comprises the first phase inverter F1 and the second phase inverter F2 of series connection mutually, and the input end of the first phase inverter F1 is connected with the output terminal of output control module 200, output terminal is connected with the input end of the second phase inverter F2; The output terminal of the second phase inverter F2 is connected with the input end of output module 300, and in this embodiment, the phase inverter that model can be used to be 74LS05 is to realize object, and can certainly use the phase inverter of other models, we do not limit.As a complete embodiment, be illustrated in figure 4 the control point survey circuit diagram including this isolation module, output control module 200 comprises 4 rejection gates and 3 and door in the figure, the input end that in figure, rejection gate is not connected with comparator circuit is unsettled does not represent that this input end is not connected with comparator circuit, reason is only schematically to depict a road comparator circuit in comparison module 100, as seen from the figure, what export when the output terminal of isolation module is 1, then represent that the Grounding of this grounding apparatus to be measured is good; What export when the output terminal of isolation module is 0, then represent that the ground connection of this grounding apparatus to be measured is broken down, now hummer W gives a warning, and relay J controls the working point disconnecting this grounding apparatus to be measured.
In the utility model, additionally provide a kind of equipment ground measuring system, above-mentioned control point survey circuit and at least one grounding apparatus to be measured is comprised in this equipment ground measuring system, wherein, in control point survey circuit, comparator circuit and grounding apparatus one_to_one corresponding to be measured are arranged, as shown in Figure 5, first comparator circuit is corresponding with the first grounding apparatus to be measured, second comparator circuit is corresponding with the second grounding apparatus to be measured, ..., N comparator circuit is corresponding with N grounding apparatus to be measured, certainly, the situation that this equipment ground measuring system comprises multiple grounding apparatus to be measured and multichannel comparator circuit is just schematically depicted in figure, when only needing to monitor a grounding apparatus to be measured, then only need access No. one comparator circuit in control point survey circuit, by that analogy.In actual measurement, between a road comparator circuit, a grounding apparatus to be measured and equipment ground, form an earthmeter loop.Description is made to this process in the earthmeter loop formed for the first comparator circuit and the first grounding apparatus to be measured below: in this earthmeter loop, control point survey circuit comprise reference mark 4. with reference mark 5., first grounding apparatus to be measured comprise reference mark 2. with reference mark 3., comprise on equipment ground reference mark 1. with reference mark 6., wherein, 1. 3. reference mark be respectively two points that this first grounding apparatus to be measured connects equipment ground originally in operational process with reference mark, two points that 3. 4. reference mark be connected with this first grounding apparatus to be measured for control point survey circuit with reference mark, 1. 5. reference mark be respectively two points that control point survey circuit connects equipment ground with reference mark.When using this earthmeter loop to carry out ground connection monitoring to the first grounding apparatus to be measured in actual applications, reference mark is arrived in reference mark to reference mark 2. to reference mark 1. to reference mark 6. 1. to reference mark 3. 4. finally, forms an earthmeter loop.Be noted that, as shown in Figure 2, reference mark here in control point survey circuit 4. and reference mark be 5. actually the two ends of testing resistance R4 point (here reference mark 4. and reference mark 5. between voltage be in comparison module 100 describe reference mark between voltage), 6. reference mark is the earth point of this testing resistance R4.In fact, here testing resistance R4 is not a real resistance, in the process of circuit connection, the position of testing resistance R4 is made up of the shell in control point survey circuit, copper cash etc., namely wiring process always reference mark 4. and reference mark 5. between do not access anything, when carrying out ground connection monitoring to the first grounding apparatus to be measured, only need detection control point 4. and reference mark 5. between resistance whether meet requirement in control point survey circuit design process.As can be seen from Figure 5, when earth fault appears in the first grounding apparatus to be measured, then corresponding state display lamp goes out, and hummer W also can report to the police.In addition, it should be noted that when carrying out ground connection monitoring to multiple grounding apparatus to be measured simultaneously, when reference mark 1. to reference mark 6. to reference mark 5. in there is earth fault, then all state display lamps all can extinguish, and hummer W reports to the police simultaneously, remind operator to carry out malfunction elimination; When other reference mark produced problem, the state display lamp in respective lines is all only had to extinguish.In a particular embodiment, grounding apparatus to be measured is grounding apparatus in FCT testing station.
It should be noted that above-described embodiment all can independent assortment as required.The above is only preferred implementation of the present utility model; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (10)
1. a control point survey circuit, is characterized in that, comprises: comparison module, output control module and output module at described control point survey circuit, wherein,
Described comparison module comprises at least one road comparator circuit, and the voltage between comparator circuit described in every road is configured to reference mark and predeterminated voltage compare and export the first level signal;
Described output control module comprises at least one input end, and each described input end is connected with the output terminal of comparator circuit described in a road, described output control module is configured to described first level signal received to be adjusted to the second electrical level signal mated with described output module;
The input end of described output module is connected with the output terminal of described output control module, and described output module is configured to the second electrical level signal responding the output of described output control module.
2. control point survey circuit as claimed in claim 1, it is characterized in that, described in every road, comparator circuit comprises: the first resistance, the second resistance, the 3rd resistance, testing resistance, comparer, the first power supply and second source, wherein,
The first end of described first resistance is connected with described first power supply, the second end is connected with the first end of described second resistance and the negative input end of described comparer respectively; Second end ground connection of described second resistance; The first end of described 3rd resistance is connected with described second source, the second end is connected with the first end of described testing resistance and the positive input terminal of described comparer respectively; Second end ground connection of described testing resistance; The output terminal of described comparer is connected with the input end of described output control module;
The voltage at the voltage at described testing resistance two ends and described second resistance two ends is compared output first level signal by comparator circuit described in every road.
3. control point survey circuit as claimed in claim 1 or 2, it is characterized in that, described output control module comprises at least one rejection gate, and the input end of described rejection gate is connected with the output terminal of described comparator circuit;
When the quantity of comparator circuit described in described comparison module is even number, the output terminal of comparator circuit described in Ze Mei road connects an input end in a described rejection gate; When the quantity of comparator circuit described in described comparison module is odd number, the output terminal of comparator circuit described in Ze Mei road connects an input end in a described rejection gate, and the input end grounding of the rejection gate be not connected with described comparator circuit.
4. control point survey circuit as claimed in claim 3, is characterized in that: described output control module comprises multiple described rejection gate and at least one and door;
The output terminal of every two described rejection gates is connected with the input end of door with described in one respectively, and every two are describedly connected with the input end of door with the 3rd with the output terminal of door respectively.
5. control point survey circuit as claimed in claim 4, it is characterized in that: described output control module comprises the first rejection gate, the second rejection gate, the 3rd rejection gate, four nor gate, first and door, second and door and the 3rd and door, described comparison module comprises No. eight comparator circuits, wherein
Described first rejection gate, second rejection gate, eight input ends of the 3rd rejection gate and four nor gate connect one to one with eight output terminals of No. eight comparator circuits respectively, described first rejection gate is connected with two input ends of door with described first respectively with the output terminal of the second rejection gate, described 3rd rejection gate is connected with two input ends of door with described second respectively with the output terminal of four nor gate, described first is connected with the input end of door with the 3rd with the output terminal of door respectively with door and described second, described 3rd is connected with the input end of described output module with the output terminal of door.
6. the control point survey circuit as described in claim 1 or 2 or 4 or 5, it is characterized in that: also comprise multiple state display lamp in described control point survey circuit, each described state display lamp is connected with the output terminal of a described comparator circuit respectively.
7. the control point survey circuit as described in claim 1 or 2 or 4 or 5, it is characterized in that: described output module comprises a hummer and a relay, described hummer is connected with the output terminal of described output control module respectively with the input end of described relay.
8. control point survey circuit as claimed in claim 7, it is characterized in that: in described control point survey circuit, also comprise isolation module, described isolation module is arranged between described output control module and described output module, the input end of described isolation module is connected with the output terminal of described output control module, and the output terminal of described isolation module is connected with the input end of described output module;
Described isolation module comprises the first phase inverter and second phase inverter of series connection mutually, and the input end of described first phase inverter is connected with the output terminal of described output control module, output terminal is connected with the input end of described second phase inverter; The output terminal of described second phase inverter is connected with the input end of described output module.
9. an equipment ground measuring system, it is characterized in that: described equipment ground measuring system comprises control point survey circuit as described in claim 1-8 any one and at least one grounding apparatus to be measured, and the described comparator circuit in described control point survey circuit and described grounding apparatus one_to_one corresponding to be measured are arranged;
An earthmeter loop is formed between comparator circuit, a described grounding apparatus to be measured and equipment ground described in one tunnel.
10. equipment ground measuring system as claimed in claim 9, is characterized in that: described grounding apparatus to be measured is grounding apparatus in FCT testing station.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520570774.8U CN204925295U (en) | 2015-07-31 | 2015-07-31 | Control point survey circuit and equipment ground measurement system |
| US15/221,636 US10222411B2 (en) | 2015-07-31 | 2016-07-28 | Grounding safety control point monitoring method, measuring circuit and equipment grounding measuring system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520570774.8U CN204925295U (en) | 2015-07-31 | 2015-07-31 | Control point survey circuit and equipment ground measurement system |
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| CN204925295U true CN204925295U (en) | 2015-12-30 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106444544A (en) * | 2016-11-22 | 2017-02-22 | 环鸿电子（昆山）有限公司 | Screw locking sequence control system |
| CN106468732A (en) * | 2015-08-21 | 2017-03-01 | 环鸿电子（昆山）有限公司 | A kind of monitoring method at grounding safety control point |
-
2015
- 2015-07-31 CN CN201520570774.8U patent/CN204925295U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106468732A (en) * | 2015-08-21 | 2017-03-01 | 环鸿电子（昆山）有限公司 | A kind of monitoring method at grounding safety control point |
| CN106444544A (en) * | 2016-11-22 | 2017-02-22 | 环鸿电子（昆山）有限公司 | Screw locking sequence control system |
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