CN201590658U - Grounding wire selecting device of microcomputer low current system - Google Patents
Grounding wire selecting device of microcomputer low current system Download PDFInfo
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- CN201590658U CN201590658U CN2010200042355U CN201020004235U CN201590658U CN 201590658 U CN201590658 U CN 201590658U CN 2010200042355 U CN2010200042355 U CN 2010200042355U CN 201020004235 U CN201020004235 U CN 201020004235U CN 201590658 U CN201590658 U CN 201590658U
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Abstract
The utility model discloses a grounding wire selecting device of a microcomputer low current system. The wire selecting device comprises a central control module, an analog quantity input module, an on-off output module, a man-machine interface module and a communication interface module, wherein the analog quantity input module, the communication interface module, the on-off output module and the man-machine interface module are connected with the central control module, output ends of a zero sequence current mutual inductor and a voltage transformer PT open delta are connected with the analog quantity input module, an output end of the analog quantity input module is connected with the central control module, and the grounding wire selecting device has high wire selecting accuracy rate, strong anti-interference and reliable running, is convenient to be connected with a comprehensive automatic interface. In addition, the grounding wire selecting device of a microcomputer low current system has extremely high wire selecting rate and is suitable for various system grounding modes of a low current grounding system, such as ungrounded neutral point, direct neutral point grounding via arc suppression coils, neutral point grounding via automatic tracking arc suppression coils and damping resistors and the like.
Description
Technical field
The utility model relates to a kind of microcomputer small current system line-selected earthing device, in particular for the microcomputer small current system line-selected earthing device of the relaying protection of electric power system.
Background technology
Small current system is meant not solidly grounded system of neutral point, comprises isolated neutral system, neutral by arc extinction coil grounding system or neutral point resistance grounded system.In China, in the electrical network of 66KV and following electric pressure thereof, generally all adopt this system.
After the small current system generation single-phase earthing, because fault signature is not obvious, makes and to indicate grounded circuit that certain degree of difficulty has been arranged rapidly, exactly that the small current system single-phase grounding selecting is the difficult problem that the relaying protection field does not thoroughly solve always.Until present, numerous universities and colleges, research institute, manufacturer all are devoted to this Products Development and production, have proposed many new approaches and new method from late nineteen eighties.
At present domestic three kinds of popular route selection principles be power direction method, harmonic analysis method (being that colony is than width of cloth phase comparing method), with the signal injection method.
(1) power direction method: adopt the power direction of the zero-sequence current of judging every circuit to determine faulty line, this method is not just accomplished 100% accuracy rate in principle, a line-to-ground be may occur, many circuits or a result who all can not judge judged.At present, this method is often adopted by profile samples unit or directional power relay in the complex automatic system.
(2) harmonic analysis method: the colony of zero sequence steady-state signal is than width of cloth phase comparing method behind the harmonic analysis method employing single-phase earthing, because than amplitude ratio phase time, what adopt is principle of relativity, therefore, there is not the dead band theoretically in this method, is not subjected to the influence of operational mode and earth resistance, can accomplish 100% accuracy rate, the validity of its variant projects of location fully proved, but the zero-sequence current that causes for the CT imbalance, this method can not effectively solve.
(3) signal injects: though wiring is simple, must zero sequence CT loop, and generally be mainly used in 10KV and following electric pressure system owing to inject the restriction of signal magnitude and method.In addition, the sensitivity of probe and reliability are subject to various extraneous factor influences, moreover combine some inconvenience of use from station and unattended station.
Summary of the invention
The utility model solves the above-mentioned problems in the prior art exactly, provides a kind of route selection accuracy rate high microcomputer small current system line-selected earthing device.
Technical solution of the present utility model is: a kind of microcomputer small current system line-selected earthing device is characterized in that: comprise central control module, analog quantity input module, the amount of leaving output module, human-machine interface module, communication interface module; Analog quantity input module, communication interface module, the amount of leaving output module, human-machine interface module, all link to each other with central control module, the output of zero sequence current mutual inductor and voltage transformer pt open delta is connected with the analog quantity input module, and the output of analog quantity input module links to each other with central control module.
Wherein, described central control module is made up of microprocessor 80C196 chip U1,74LS573 chip U2,27C256 chip U3, Intel6264 chip U4; The AD0-AD7 port bus of microprocessor 80C196 chip U1 is connected with the input 1D-8D of 74LS573 chip U2, the output 1Q-8Q of 74LS573 chip U2 is address bus A0-A7, the AD8-AD15 of microprocessor 80C196 chip U1 is multiplexed with the A8-A15 of address bus, the AD8-AD14 port bus of microprocessor 80C196 chip U1 is connected with the input A8-A14 of 27C256 chip U3, the AD15 port bus of microprocessor 80C196 chip U1 selects CE to be connected with 27C256 chip U3 sheet, the AD8-AD12 port bus of microprocessor 80C196 chip U1 is connected with the input A8-A12 of Intel6264 chip U4, the output 1Q-8Q of 74LS573 chip U2 respectively with the input A0-A7 of 27C256 chip U3, the input A0-A7 of Intel6264 chip U4 connects, the AD0-AD7 port bus of microprocessor 80C196 chip U1 as data/address bus D0-D7 respectively with the D0-D7 port of 27C256 chip U3, the D0-D7 port of Intel6264 chip U4, the data/address bus D0-D7 of the liquid-crystal display section of human-machine interface module connects, the P1.0-P1.3 port of microprocessor 80C196 chip U1 is connected with the key input part of human-machine interface module, and the P2.0-P2.1 port of microprocessor 80C196 chip U1 is connected with communication interface module.
Wherein, described analog quantity input module comprises two large divisions's circuit, 5 variable connector MAX308 chip U20-U24, operational amplifier LE347 chip U6; Wherein being input to U21 is the zero-sequence current input circuit to the circuit part of U24, comprise 28 tunnel identical circuit, every partial circuit comprises current transformer CT1-CT28 respectively, the zero sequence current mutual inductor of suit on input CT1, the CT1*-CT28 of current transformer CT1-CT28, the CT28* external circuit, current transformer CT1-CT28 output 1 pin are divided into four groups and are connected with input 4,5,6,7,9,10,11,12 pin of variable connector MAX308 chip U21-U24 in proper order respectively; Output 8 pin of variable connector MAX308 chip U21-U24 link to each other respectively and are connected with input 3 pin of operational amplifier LE347 chip U6 through behind the resistance, and output 1 pin of operational amplifier LE347 chip U6 is connected with the input P0.4 of microprocessor 80C196 chip U1 behind resistance; Another part is the residual voltage input circuit, comprise 4 tunnel identical circuit, every partial circuit comprises voltage transformer pt 1-PT4 respectively, connect zero sequential potential transformer on input PT1, the PT1*-PT4 of voltage transformer pt 1-PT4, the PT4* external circuit, voltage transformer pt 1-PT4 output 1 pin links to each other respectively with input 4,5,6,7 pin of variable connector MAX308 chip U20 respectively; Output 8 pin of variable connector MAX308 chip U20 link to each other respectively with output 8 pin of variable connector MAX308 chip U21-U24 and are connected with input 3 pin of operational amplifier LE347 chip U6 through resistance R 13 backs, and output 1 pin of operational amplifier LE347 chip U6 is connected with the input P0.4 of microprocessor 80C196 chip U1 after resistance R 1.Wherein, described communication interface module comprises MAX489 interface chip U8 and MAX232 interface chip U9; The P2.0 port of microprocessor 80C196 chip U1 is connected with 5 pin of MAX489 interface chip U8 and 11 pin of MAX232 interface chip U9 respectively; The P2.1 port of microprocessor 80C196 chip U1 is connected with 2 pin of MAX489 interface chip U8 and 12 pin of MAX232 interface chip U9 respectively; 29,35 pin of microprocessor 80C196 chip U1 respectively with 3,4 pin of MAX489 interface chip U8; After being connected, 9,12 pin of MAX489 interface chip U8 are connected to the RS485A of the RS485 PORT COM of device reservation; After being connected, 10,11 pin of MAX489 interface chip U8 are connected to the RS485B of the RS485 PORT COM of device reservation; 13,14 pin of MAX232 interface chip U9 are connected to RXD, the TXD of the RS232 PORT COM of device reservation respectively.
Wherein, the described amount of leaving output module comprises that 8 TLP521-4 photoelectric isolated chip U51-U58,8 74LS273 buffer U59-U66,8 ULN2003 rp-drive U67-U74,74LS1648 bit shift register U68,32 JDQ alarm relay JDQ1-JDQ32 form, and 1,2 pin of 74LS1648 bit shift register U68 connect the back and are connected with the P2.1 port of microprocessor 80C196 chip U1; 8 pin of 74LS1648 bit shift register U68 are connected with the P2.0 port of microprocessor 80C196 chip U1; The output QA-QH of 74LS1648 bit shift register U68 is connected with the input 1D-8D of 8 74LS273 buffer U59-U66; The output 1Q-4Q of 8 74LS273 buffer U59-U66 is connected with input 2,4,6,8 pin of 8 TLP521-4 photoelectric isolated chip U51-U58 respectively; 1,3,5,7 pin of 8 TLP521-4 photoelectric isolated chip U51-U58 are connected with the 1-4 pin of 8 ULN2003 rp-drive U67-U74 respectively; The 10-13 pin of 8 ULN2003 rp-drive U67-U74 is connected with 1 pin of 32 JDQ alarm relay JDQ1-JDQ32 respectively; 2 pin of 32 JDQ alarm relay JDQ1-JDQ32 are connected with power supply VCC1; Report to the police in the outer welding system 28 route roads of 4,5 pin of 32 JDQ alarm relay JDQ1-JDQ32 and 4 road buses are reported to the police.
The little electric current line selection apparatus of this microcomputer monitors each section PT open delta winding voltage (that is: residual voltage), when residual voltage during greater than set point, gather, analyze the zero-sequence current amount of all outlets on the earth bus, because the zero-sequence current of faulty line is other non-fault line zero-sequence current sums, it is maximum in this group sampled value in principle, but because CT error, signal disturbs and circuit length difference great disparity, might when ordering, be discharged to second, the 3rd, generally can not exceed first three, adopt the relative value notion this moment (under existing operational mode, it is maximum to get first three), next step, in first three signal, adopt the relative phase notion, promptly use the leading and lagged relationship of direction between the electric current or the phase place between electric current and the voltage, further determine which line failure or busbar fault in first three.For the neutral by arc extinction coil grounding system, when ground connection is taken place, owing to adopt dual criterion, and the utilization principle of relativity, it is changeable to have overcome power system operation mode, the influence of earth resistance and circuit length, and need not adjust.
Adopt the little electric current line selection apparatus of microcomputer of said structure, the electric current of sampling, voltage signal can be very accurate after passing through antijamming capability very strong variable connector MAX308 chip, transport and placing device and signal condition, and the judgement of ground path is more accurate.Communication interface module can with comprehensive automation and telemechanical interface easily.The utility model liquid crystal Chinese character shows in a word, compact conformation, and easy to use directly perceived, parameter change is convenient, and route selection is accurately and reliably.At isolated neutral or in the electric power system (abbreviation small current system) of arc suppression coil or grounding through resistance, the little electric current line selection apparatus of the microcomputer that the route selection accuracy rate is very high.
Description of drawings
Fig. 1 is the theory diagram of microcomputer small current system line-selected earthing device of the present utility model;
Fig. 2 is the circuit diagram of microcomputer small current system line-selected earthing device of the present utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is described further.
As shown in Figure 1 and Figure 2, the small current system of microcomputer shown in line-selected earthing device comprises central control module, analog quantity input module, the amount of leaving output module, human-machine interface module, communication interface module; Analog quantity input module, communication interface module, the amount of leaving output module, human-machine interface module, all link to each other with central control module, the output of zero sequence current mutual inductor and voltage transformer pt open delta is connected with the analog quantity input module, and the output of analog quantity input module links to each other with central control module.
Central control module is made up of microprocessor 80C196 chip U1,74LS573 chip U2,27C256 chip U3, Intel6264 chip U4; The AD0-AD7 port bus of microprocessor 80C196 chip U1 is connected with the input 1D-8D of 74LS573 chip U2, the output 1Q-8Q of 74LS573 chip U2 is address bus A0-A7, the AD8-AD15 of microprocessor 80C196 chip U1 is multiplexed with the A8-A15 of address bus, the AD8-AD14 port bus of microprocessor 80C196 chip U1 is connected with the input A8-A14 of 27C256 chip U3, the AD15 port bus of microprocessor 80C196 chip U1 selects CE to be connected with 27C256 chip U3 sheet, the AD8-AD12 port bus of microprocessor 80C196 chip U1 is connected with the input A8-A12 of Intel6264 chip U4, the output 1Q-8Q of 74LS573 chip U2 respectively with the input A0-A7 of 27C256 chip U3, the input A0-A7 of Intel6264 chip U4 connects, the AD0-AD7 port bus of microprocessor 80C196 chip U1 as data/address bus D0-D7 respectively with the D0-D7 port of 27C256 chip U3, the D0-D7 port of Intel6264 chip U4, the data/address bus D0-D7 of the liquid-crystal display section of human-machine interface module connects, the P1.0-P1.3 port of microprocessor 80C196 chip U1 is connected with the key input part of human-machine interface module, and the P2.0-P2.1 port of microprocessor 80C196 chip U1 is connected with communication interface module.
The analog quantity input module comprises two large divisions's circuit, 5 variable connector MAX308 chip U20-U24, operational amplifier LE347 chip U6.Wherein being input to U21 is the zero-sequence current input circuit to the circuit part of U24, comprise 28 tunnel identical circuit, every partial circuit comprises current transformer CT1-CT28 respectively, the zero sequence current mutual inductor of suit on input CT1, the CT1*-CT28 of current transformer CT1-CT28, the CT28* external circuit, current transformer CT1-CT28 output 1 pin are divided into four groups and are connected with input 4,5,6,7,9,10,11,12 pin of variable connector MAX308 chip U21-U24 in proper order respectively; Output 8 pin of variable connector MAX308 chip U21-U24 link to each other respectively and are connected with input 3 pin of operational amplifier LE347 chip U6 through resistance R 13 backs, and output 1 pin of operational amplifier LE347 chip U6 is connected with the input P0.4 of microprocessor 80C196 chip U1 after resistance R 1; Another part is residual voltage input circuit U20, comprise 4 tunnel identical circuit, every partial circuit comprises voltage transformer pt 1-PT4 respectively, connect zero sequential potential transformer on input PT1, the PT1*-PT4 of voltage transformer pt 1-PT4, the PT4* external circuit, voltage transformer pt 1-PT4 output 1 pin links to each other respectively with input 4,5,6,7 pin of variable connector MAX308 chip U20 respectively; Output 8 pin of variable connector MAX308 chip U20 link to each other respectively with output 8 pin of variable connector MAX308 chip U21-U24 and are connected with input 3 pin of operational amplifier LE347 chip U6 through resistance R 13 backs, and output 1 pin of operational amplifier LE347 chip U6 is connected with the input P0.4 of microprocessor 80C196 chip U1 after resistance R 1.
Communication interface module comprises MAX489 interface chip U8 and MAX232 interface chip U9; The P2.0 port of microprocessor 80C196 chip U1 is connected with 5 pin of MAX489 interface chip U8 and 11 pin of MAX232 interface chip U9 respectively; The P2.1 port of microprocessor 80C196 chip U1 is connected with 2 pin of MAX489 interface chip U8 and 12 pin of MAX232 interface chip U9 respectively; 29,35 pin of microprocessor 80C196 chip U1 respectively with 3,4 pin of MAX489 interface chip U8; After being connected, 9,12 pin of MAX489 interface chip U8 are connected to the RS485A of the RS485 PORT COM of device reservation; After being connected, 10,11 pin of MAX489 interface chip U8 are connected to the RS485B of the RS485 PORT COM of device reservation; 13,14 pin of MAX232 interface chip U9 are connected to RXD, the TXD of the RS232 PORT COM of device reservation respectively.
The amount of leaving output module comprises that TLP521-4 photoelectric isolated chip U51-U58,74LS273 buffer U59-U66, ULN2003 rp-drive U67-U74,74LS1648 bit shift register U68, JDQ alarm relay JDQ1-JDQ32 form, and 1,2 pin of 74LS1648 bit shift register U68 connect the back and are connected with the P2.1 port of microprocessor 80C196 chip U1; 8 pin of 74LS1648 bit shift register U68 are connected with the P2.0 port of microprocessor 80C196 chip U1; The output QA-QH of 74LS1648 bit shift register U68 is connected with the input 1D-8D of 74LS273 buffer U59-U66; The output 1Q-4Q of 74LS273 buffer U59-U66 is connected with input 2,4,6,8 pin of TLP521-4 photoelectric isolated chip U51-U58 respectively; 1,3,5,7 pin of TLP521-4 photoelectric isolated chip U51-U58 are connected with the 1-4 pin of ULN2003 rp-drive U67-U74 respectively; The 10-13 pin of ULN2003 rp-drive U67-U74 is connected with 1 pin of JDQ alarm relay JDQ1-JDQ32 respectively; 2 pin of JDQ alarm relay JDQ1-JDQ32 are connected with power supply VCC1; JDQ
Report to the police in the outer welding system 28 route roads of 4,5 pin of alarm relay JDQ1-JDQ32 and 4 road buses are reported to the police.
After the utility model energising, power supply indicator on the access panel and LCDs.Normal condition is: power lights is bright, and normal runnable interface of liquid crystal display and display system are normal.
Device has good man-machine interface interface, device operation back is detected the button input in real time, can carry out the setting of bus number, line number, time, address, baud rate etc. easily, can also realize that fault message checks, functions such as printing, install residual voltage, the zero sequence current signal at real-time cycle detection scene, on-the-spot residual voltage, zero sequence current signal are connected with variable connector MAX308 chip U20-U24 by behind PT1-PT4, the CT1-CT28 respectively; Output 8 pin of variable connector MAX308 chip U20-U24 link to each other respectively and are connected with input 3 pin of operational amplifier LE347 chip U6 through resistance R 13 backs, and output 1 pin of operational amplifier LE347 chip U6 is connected with the input P0.4 of microprocessor 80C196 chip U1 after resistance R 1; Analyze, calculate residual voltage, zero sequence current signal through behind the signal condition by microprocessor 80C196 chip U1; When single ground connection takes place in small current system, faulty line and zero-sequence current are other non-fault line zero-sequence current sum, it is maximum in this group sampled value in principle, but because CT error, sampling error, signal disturbs and circuit length difference great disparity, might when ordering, be discharged to second, the 3rd, generally can not exceed first three, this step is primary election, the principle that is adopted also is that the relative value notion is (under existing operational mode, it is maximum to get first three), in second step, in first three signal, adopt the relative phase notion, promptly use the leading and lagged relationship of direction between the electric current or the phase place between electric current and the voltage, further determine which line failure or busbar fault in first three.The indicator light part that after device is confirmed earth fault, can connect human-machine interface module by the P1.2-P1.5 port of microprocessor 80C196 chip U1, light grounded signal lamp, the data/address bus D0-D7 that AD0-AD7 port by microprocessor 80C196 chip U1 connects the liquid-crystal display section of human-machine interface module carries out faulty line number, the demonstration of fault time, P2.0 by microprocessor 80C196 chip U1, the P2.1 port connects 74LS1648 bit shift register U68,74LS273 buffer U59-U66, TLP521-4 photoelectric isolated chip U51-U58, ULN2003 rp-drive U67-U74 drives JDQ alarm relay JDQ1-JDQ32 and sends corresponding fault earthing alarm signal, is connected to the external alert device.
Be appreciated that, the foregoing description of the present utility model combines the electronic device of concrete model, yet those skilled in the art can adopt the device of different model that the device in the foregoing description is replaced under general plotting of the present utility model, and finish corresponding function.
Claims (5)
1. a microcomputer small current system line-selected earthing device is characterized in that: comprise central control module, analog quantity input module, the amount of leaving output module, human-machine interface module, communication interface module; Analog quantity input module, communication interface module, the amount of leaving output module, human-machine interface module, all link to each other with central control module, the output of zero sequence current mutual inductor and voltage transformer pt open delta is connected with the analog quantity input module, and the output of analog quantity input module links to each other with central control module.
2. microcomputer small current system line-selected earthing device as claimed in claim 1 is characterized in that: described central control module is made up of microprocessor 80C196 chip U1,74LS573 chip U2,27C256 chip U3, Intel6264 chip U4; The AD0-AD7 port bus of microprocessor 80C196 chip U1 is connected with the input 1D-8D of 74LS573 chip U2, the output 1Q-8Q of 74LS573 chip U2 is address bus A0-A7, the AD8-AD15 of microprocessor 80C196 chip U1 is multiplexed with the A8-A15 of address bus, the AD8-AD14 port bus of microprocessor 80C196 chip U1 is connected with the input A8-A14 of 27C256 chip U3, the AD15 port bus of microprocessor 80C196 chip U1 selects CE to be connected with 27C256 chip U3 sheet, the AD8-AD12 port bus of microprocessor 80C196 chip U1 is connected with the input A8-A12 of Intel6264 chip U4, the output 1Q-8Q of 74LS573 chip U2 respectively with the input A0-A7 of 27C256 chip U3, the input A0-A7 of Intel6264 chip U4 connects, the AD0-AD7 port bus of microprocessor 80C196 chip U1 as data/address bus D0-D7 respectively with the D0-D7 port of 27C256 chip U3, the D0-D7 port of Intel6264 chip U4, the data/address bus D0-D7 of the liquid-crystal display section of human-machine interface module connects, the P1.0-P1.3 port of microprocessor 80C196 chip U1 is connected with the key input part of human-machine interface module, and the P2.0-P2.1 port of microprocessor 80C196 chip U1 is connected with communication interface module.
3. microcomputer small current system line-selected earthing device as claimed in claim 1 is characterized in that: described analog quantity input module comprises two large divisions's circuit, 5 variable connector MAX308 chip U20-U24, operational amplifier LE347 chip U6; Wherein being input to U21 is the zero-sequence current input circuit to the circuit part of U24, comprise 28 tunnel identical circuit, every partial circuit comprises current transformer CT1-CT28 respectively, the zero sequence current mutual inductor of suit on input CT1, the CT1*-CT28 of current transformer CT1-CT28, the CT28* external circuit, current transformer CT1-CT28 output 1 pin are divided into four groups and are connected with input 4,5,6,7,9,10,11,12 pin of variable connector MAX308 chip U21-U24 in proper order respectively; Output 8 pin of variable connector MAX308 chip U21-U24 link to each other respectively and are connected with input 3 pin of operational amplifier LE347 chip U6 through behind the resistance, and output 1 pin of operational amplifier LE347 chip U6 is connected with the input P0.4 of microprocessor 80C196 chip U1 behind resistance; Another part is the residual voltage input circuit, comprise 4 tunnel identical circuit, every partial circuit comprises voltage transformer pt 1-PT4 respectively, connect zero sequential potential transformer on input PT1, the PT1*-PT4 of voltage transformer pt 1-PT4, the PT4* external circuit, voltage transformer pt 1-PT4 output 1 pin links to each other respectively with input 4,5,6,7 pin of variable connector MAX308 chip U20 respectively; Output 8 pin of variable connector MAX308 chip U20 link to each other respectively with output 8 pin of variable connector MAX308 chip U21-U24 and are connected with input 3 pin of operational amplifier LE347 chip U6 through resistance R 13 backs, and output 1 pin of operational amplifier LE347 chip U6 is connected with the input P0.4 of microprocessor 80C196 chip U1 after resistance R 1.
4. microcomputer small current system line-selected earthing device as claimed in claim 1 is characterized in that: described communication interface module comprises MAX489 interface chip U8 and MAX232 interface chip U9; The P2.0 port of microprocessor 80C196 chip U1 is connected with 5 pin of MAX489 interface chip U8 and 11 pin of MAX232 interface chip U9 respectively; The P2.1 port of microprocessor 80C196 chip U1 is connected with 2 pin of MAX489 interface chip U8 and 12 pin of MAX232 interface chip U9 respectively; 29,35 pin of microprocessor 80C196 chip U1 respectively with 3,4 pin of MAX489 interface chip U8; After being connected, 9,12 pin of MAX489 interface chip U8 are connected to the RS485A of the RS485 PORT COM of device reservation; After being connected, 10,11 pin of MAX489 interface chip U8 are connected to the RS485B of the RS485 PORT COM of device reservation; 13,14 pin of MAX232 interface chip U9 are connected to RXD, the TXD of the RS232 PORT COM of device reservation respectively.
5. microcomputer small current system line-selected earthing device as claimed in claim 1, it is characterized in that: the described amount of leaving output module comprises that 8 TLP521-4 photoelectric isolated chip U51-U58,8 74LS273 buffer U59-U66,8 ULN2003 rp-drive U67-U74,7,4LS,164 8 bit shift register U68,32 JDQ alarm relay JDQ1-JDQ32 form, and 1,2 pin of 7,4LS,164 8 bit shift register U68 connect the back and are connected with the P2.1 port of microprocessor 80C196 chip U1; 8 pin of 7,4LS,164 8 bit shift register U68 are connected with the P2.0 port of microprocessor 80C196 chip U1; The output QA-QH of 7,4LS,164 8 bit shift register U68 is connected with the input 1D-8D of 8 74LS273 buffer U59-U66; The output 1Q-4Q of 8 74LS273 buffer U59-U66 is connected with input 2,4,6,8 pin of 8 TLP521-4 photoelectric isolated chip U51-U58 respectively; 1,3,5,7 pin of 8 TLP521-4 photoelectric isolated chip U51-U58 are connected with the 1-4 pin of 8 ULN2003 rp-drive U67-U74 respectively; The 10-13 pin of 8 ULN2003 rp-drive U67-U74 is connected with 1 pin of 32 JDQ alarm relay JDQ1-JDQ32 respectively; 2 pin of 32 JDQ alarm relay JDQ1-JDQ32 are connected with power supply VCC1; Report to the police in the outer welding system 28 route roads of 4,5 pin of 32 JDQ alarm relay JDQ1-JDQ32 and 4 road buses are reported to the police.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010200042355U CN201590658U (en) | 2010-01-21 | 2010-01-21 | Grounding wire selecting device of microcomputer low current system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010200042355U CN201590658U (en) | 2010-01-21 | 2010-01-21 | Grounding wire selecting device of microcomputer low current system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103762578A (en) * | 2014-01-14 | 2014-04-30 | 青岛世驰电气有限公司 | Intelligent tuning compensation package unit |
| CN109061383A (en) * | 2018-08-08 | 2018-12-21 | 安徽亚辉电气自动化有限公司 | A kind of microcomputer line selection device for low current |
-
2010
- 2010-01-21 CN CN2010200042355U patent/CN201590658U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103762578A (en) * | 2014-01-14 | 2014-04-30 | 青岛世驰电气有限公司 | Intelligent tuning compensation package unit |
| CN109061383A (en) * | 2018-08-08 | 2018-12-21 | 安徽亚辉电气自动化有限公司 | A kind of microcomputer line selection device for low current |
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