CN215706376U - DC110V digital quantity acquisition card based on CPCI bus - Google Patents
DC110V digital quantity acquisition card based on CPCI bus Download PDFInfo
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- CN215706376U CN215706376U CN202122044623.7U CN202122044623U CN215706376U CN 215706376 U CN215706376 U CN 215706376U CN 202122044623 U CN202122044623 U CN 202122044623U CN 215706376 U CN215706376 U CN 215706376U
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Abstract
The utility model discloses a DC110V digital quantity acquisition card based on a CPCI bus, which comprises a self-checking control circuit, a digital quantity conditioning circuit, an optical coupling isolation and acquisition circuit, a tri-state buffer, a PCI bridge and a peripheral circuit, wherein the digital quantity conditioning circuit receives relay contact information through an external input interface connector, and the output end of the digital quantity conditioning circuit is connected with the optical coupling isolation and acquisition circuit; the output end of the optical coupling isolation and acquisition circuit is connected to the PCI bridge through a tri-state buffer; the PCI bridge performs data interaction with the CPCI computer through a PCI bus; the input end of the self-checking control circuit is connected with a control signal of the PCI bridge, and the output end of the self-checking control circuit is connected with the digital quantity conditioning circuit. The utility model is used as an expansion board of the CPCI computer, can effectively acquire the digital input information of the DC110V of the subway vehicle-mounted relay, further monitors the state of the vehicle-mounted relay, can quickly locate the fault position and plays a role in fault diagnosis.
Description
Technical Field
The utility model relates to a rail transit information monitoring device, in particular to a DC110V digital quantity acquisition card based on a CPCI bus.
Background
In the field of rail transit information monitoring, the CPCI computer is applied to a certain extent due to the advantages of high development, high reliability, hot-pluggable performance and the like. At present, the communication information of the vehicle-mounted controller and the train management system is mainly monitored and recorded, and the method is used for analyzing the monitored data and carrying out fault diagnosis when false alarm information appears on a human-computer interface of the train management system.
The contact information of the relay of the subway vehicle-mounted equipment is mainly the opening and closing digital quantity information of the relay such as braking, direction, vehicle door opening and closing, traction commands and the like, and can provide diagnostic data for the misoperation of the relay. At present, a CPCI computer cannot monitor the contact information of a relay of the subway vehicle-mounted equipment and lacks the function of monitoring the state of an execution unit of the subway vehicle-mounted equipment.
SUMMERY OF THE UTILITY MODEL
Aiming at the defect that a CPCI computer in the prior art cannot monitor the contact information of a relay of subway vehicle-mounted equipment, the utility model provides a DC110V digital quantity acquisition card based on a CPCI bus, which is used as an expansion board of the CPCI computer, is inserted into the CPCI computer and is used for monitoring the digital quantity input information of two states of closing and opening of the relay.
In order to solve the technical problems, the utility model adopts the technical scheme that:
the utility model provides a DC110V digital quantity acquisition card based on a CPCI bus, which comprises a self-checking control circuit, a digital quantity conditioning circuit, an optical coupling isolation and acquisition circuit, a tri-state buffer, a PCI bridge and a peripheral circuit, wherein the digital quantity conditioning circuit receives relay contact information through an external input interface connector, and the output end of the digital quantity conditioning circuit is connected with the optical coupling isolation and acquisition circuit; the output end of the optical coupling isolation and acquisition circuit is connected to the PCI bridge through a tri-state buffer; the PCI bridge performs data interaction with the CPCI computer through a PCI bus; the input end of the self-checking control circuit is connected with a control signal of the PCI bridge, and the output end of the self-checking control circuit is connected with the digital quantity conditioning circuit.
The self-checking control circuit comprises a solid-state relay and a triode, wherein the base electrode of the triode is connected with a user IO pin of the PCI bridge, the collector electrode of the triode is connected with the negative electrode of the control end of the solid-state relay, and the emitter electrode of the triode is grounded; the anode of the control end of the solid-state relay is connected with a CPCI working power supply, the anode of the load end is connected with a DC110V reference power supply, and the cathode of the load end is connected with the input end of the digital quantity conditioning circuit through a diode.
And a current-limiting resistor is connected between the base of the triode and the user IO pin of the PCI bridge.
A transient suppression diode and a filter capacitor are arranged between the anode of the load end of the solid-state relay and the DC110V power ground.
The digital quantity conditioning circuit comprises a voltage stabilizing diode, a current limiting resistor and a sampling resistor, wherein the sampling resistor is connected between the positive electrode and the negative electrode of the input end of the photoelectric coupler, one end of the sampling resistor, which is connected with the negative electrode of the input end of the photoelectric coupler, is connected to the grounding end of the external input interface, the other end of the sampling resistor is connected with the input end of the external input interface connector through the voltage stabilizing diode and the current limiting resistor, and the sampling resistor is also connected with the negative electrode of the load end of the self-checking control circuit.
And a diode with a voltage reverse protection function is arranged between the voltage stabilizing diode and the negative electrode of the load end of the self-checking control circuit.
A transient suppression diode and a filter capacitor are connected between the input of the external input interface connector and the DC110V power ground.
And two ends of the input end of the photoelectric coupler are connected with protective diodes.
The voltage stabilizing diodes are two first to second voltage stabilizing diodes connected in series.
The utility model has the following beneficial effects and advantages:
1. the utility model provides a DC110V digital quantity acquisition card based on a CPCI bus, which is used as an expansion board of a CPCI computer and can effectively acquire digital quantity input information of a subway vehicle-mounted relay DC110V so as to monitor the state of the vehicle-mounted relay. When the train brakes, the running direction, the opening and closing of the train door, the traction command and the lifting pantograph are abnormal, the fault position can be quickly positioned, and the fault diagnosis effect is achieved.
2. The utility model can monitor 16 paths of relay contact information at the same time, and when more relay contacts need to be monitored, the number of acquisition cards can be increased; the utility model reliably judges the high level when inputting DC 77V-DC137.5V, and reliably judges the low level when the input is lower than DC60V, and has the characteristic of allowing wide-range input.
3. The utility model has the characteristic of preventing the reverse connection of external input, can play the role of protecting the whole digital quantity acquisition channel when external misoperation occurs, can realize the self-checking function, and can be isolated from the system when the input channel of the acquisition card fails without influencing the monitored relay node.
4. The utility model adopts the photoelectric isolation measure to reduce the influence of field intensity on the CPCI computer.
Drawings
FIG. 1 is an electrical schematic block diagram of a DC110V digital quantity acquisition card based on a CPCI bus;
FIG. 2 is a schematic diagram of the data transmission direction in the present invention;
FIG. 3 is a schematic diagram of an input channel self-test control circuit and a digital conditioning circuit according to the present invention;
FIG. 4 is a schematic diagram of an input interface according to the present invention;
FIG. 5 is a schematic diagram of an opto-coupler isolation and acquisition circuit according to the present invention;
FIG. 6 is a schematic diagram of a tri-state buffer circuit according to the present invention.
Detailed Description
The utility model is further elucidated with reference to the accompanying drawings.
As shown in fig. 1-2, the utility model provides a DC110V digital acquisition card based on a CPCI bus, comprising a self-checking control circuit, a digital conditioning circuit, an optical coupling isolation and acquisition circuit, a tri-state buffer, a PCI bridge and a peripheral circuit, wherein the digital conditioning circuit receives relay contact information through an external input interface connector, and an output end of the digital conditioning circuit is connected with the optical coupling isolation and acquisition circuit; the output end of the optical coupling isolation and acquisition circuit is connected to the PCI bridge through a tri-state buffer; the PCI bridge performs data interaction with the CPCI computer through a PCI bus; the input end of the self-checking control circuit is connected with a control signal of the PCI bridge, and the output end of the self-checking control circuit is connected with the digital quantity conditioning circuit.
As shown in fig. 3, the self-checking control circuit includes a solid-state relay U1 and a transistor Q1, wherein the base of the transistor Q1 is connected to the user IO pin of the PCI bridge, the collector is connected to the negative electrode of the control terminal of the solid-state relay U1, and the emitter is grounded; the anode of the control end of the solid-state relay U1 is connected with a CPCI working power supply (DC 5V voltage), the anode of the load end is connected with a DC110V reference power supply, and the cathode of the load end is connected with the input end of the digital quantity conditioning circuit through a diode.
A current-limiting resistor is connected between the base electrode of the triode Q1 and a user IO pin of the PCI bridge, and a transient suppression diode and a filter capacitor are arranged between the anode of the load end of the solid-state relay U1 and the DC110V power ground.
According to the utility model, a solid-state relay U1 is introduced into a self-checking control circuit, the on-off of a triode Q1 is controlled through an HIT1 (USER 0) pin of a PCI9052(PCI bridge chip), the on-off of the solid-state relay U1 is further controlled, and finally, a reference voltage DC110V (HTS 1) is controlled to be input into a digital conditioning circuit, so that the purpose of input self-checking is achieved.
As shown in fig. 3, the digital conditioning circuit includes a zener diode, a current limiting resistor R8, and a sampling resistor R16, wherein the sampling resistor R16 is connected between the positive and negative terminals of the input terminal of the photocoupler U7, one end of the sampling resistor R16 connected to the negative terminal of the input terminal of the photocoupler U7 is connected to the ground terminal of the external input interface, and the other end is connected to the input terminal of the external input interface connector through the zener diode and the current limiting resistor R8, and is also connected to the negative terminal of the load terminal of the self-checking control circuit.
In this embodiment, the digital conditioning circuits adopt 16 paths, and a diode D66 with a voltage reverse protection function is arranged between a voltage stabilizing diode of each digital conditioning circuit and a negative electrode of a load end of the self-checking control circuit. The anode of the self-checking control circuit load end HTS1 is connected, if a reverse protection diode D66 is not arranged and is directly connected to the HTS1 end, the DI is directly pulled up to HTS1 once the DI is input into DC110V, and then 16 input channels are all high; after the reverse protection diode D66 is provided, when a certain channel has a high level, the channel will not feed back the high level to the HTS1, and will not feed back to other channels, so as to perform the reverse blocking function.
A transient suppression diode and a filter capacitor are connected between the input end of the external input interface connector and the DC110V power ground; and a protection diode D23 is connected to two ends of the photoelectric coupler U7, and when a reverse voltage is connected, the protection diode D23 is conducted to protect the input end of the photoelectric coupler U7 from being broken down.
The voltage stabilizing diodes are two first to second voltage stabilizing diodes D15 and D18 which are connected in series, play a role in setting a threshold of a starting voltage of the digital conditioning circuit, and solve the problem that a single voltage stabilizing diode generates heat seriously. Two voltage stabilizing diodes are adopted to play a role of mutual voltage division, and when the same current flows, the heating problem can be remarkably relieved.
The digital quantity conditioning circuit reduces the voltage of DC110V through a first voltage-stabilizing diode D15, a second voltage-stabilizing diode D18, a current-limiting resistor R8 and a sampling resistor R16. In this embodiment, the first and second zener diodes D15 and D18 are two 30V zener diodes, and when the input (DI) < DC60V, each zener diode is in a reverse cut-off state, the resistance is large, and the current is almost 0. When the input (DI) is equal to or more than DC77, each voltage stabilizing diode is in a voltage stabilizing state, and the voltage at two ends is about 60V. The current flowing through the input end of the photoelectric coupler U7 is adjusted by adjusting the size of the current limiting resistor of the current limiting R8, so that the photoelectric coupler is opened by enough current, and the purpose of acquiring high level is realized.
When the polarity of the input end DI1 of the external input interface connector is reversed, the diode D6 is in a cut-off state, the circuit has no current, and the function of protecting the whole rear-stage circuit is achieved. In addition, the capacitor C7 and the transient suppression diode TZ7 have the capabilities of filtering and resisting electromagnetic interference.
As shown in fig. 4, a D-SUB50 connector is used for the external connector, and the connector provides a 16-way interface, each of which is composed of an input and GND. Since the ground contacts of the on-board relays of the subway DC110V are all connected, the internal connector GND is connected. In addition, to implement the self-test function, an input DC110V reference voltage is required.
As shown in fig. 5, each acquisition channel is composed of a digital conditioning circuit and an optical coupling isolation and acquisition circuit. After the optical coupling isolation and acquisition circuit is conducted, the large voltage on the primary side can be converted into a DC5V signal at the bus end, the acquisition and isolation effects are realized, and the bus end is protected from being interfered.
As shown in fig. 6, the DC5V signal collected by the collection channel is sent to the PCI bridge (PCI 9052) through the tri-state buffer. The tri-state buffer serves to enhance the driving capability and enable the output to be controlled by the PCI bridge.
The acquisition card sends the finally acquired DC5V signal to the PCI9052 bridge chip, and after the system is powered on, the initialization of the board card is completed by loading EEPROM configuration data and a driving program. The Linux system can read an incoming DC110V level signal by command.
The present embodiment uses J1 and J2 connectors to meet the interface specification of the CPCI bus and termination resistors to meet the CPCI electrical specification. The PCI9052 is connected to the CPCI bus through a termination resistor. The CPCI bus interface itself has vibration resistance.
The utility model adopts a 3U structure, the size of the printed board is 160 mm x 100 mm, the thickness is 1.60mm, and the front panel adopts the width of 4HP (20.32 mm). During design, the distance between the welding disc and the metal piece is kept to be more than 5mm, and the panel is insulated by adopting an anodic oxidation process. The collecting panel is made of aluminum panel to prevent open fire from invading the inside or spread from the inside to the outside. The printed board locally increases the copper laying area to increase the heat dissipation capacity, for example, the surface layer and the bottom layer where the voltage stabilizing diode and the current limiting resistor are located are properly copper laid, and the operation reliability is improved.
The utility model can collect subway relay contact DC110V hard wire signals. The number of the acquisition channels is 16, and the structure forms of each digital quantity conditioning circuit and the optical coupling isolation and acquisition circuit are the same. The digital quantity conditioning circuit reduces the voltage of DC110V through a voltage stabilizing diode, a current limiting resistor and a sampling resistor, and then leads the optical coupler to be saturated and conducted after current limiting, and maintains certain conduction current of the photoelectric coupler. After the photoelectric coupler is conducted, the secondary collector is connected to the CPCI bus DC5V, the emitter is connected to the sampling and current-limiting resistor, and small signal voltage close to DC5V can be output. The small signal voltage is sent to a tri-state buffer, and the PCI9052 can control the tri-state buffer to read the acquired small signal voltage and send the small signal voltage to a CPCI bus for a CPU to read and store corresponding information.
When the relay is disconnected, the whole input circuit has no voltage, the optical coupler cannot be conducted, and the PCI bridge chip can only acquire 0V information, so that the acquisition card can monitor two states of DC110V and 0V information, and the purpose of digital quantity acquisition is achieved.
EERPOM configures configuration data for PCI bridge chip initialization. The PCI bridge chip can control the self-checking circuit to be started through the user IO pin and is used for detecting whether the digital quantity conditioning circuit works normally or not to the tri-state buffer, and the purpose of self-checking of an input channel is achieved.
The acquisition card controls a triode through a USER port of the PCI9052 and indirectly controls the conduction and the disconnection of a solid-state relay to introduce and shield a DC110V power supply so as to achieve the purpose of self-checking. The EEPROM configures the PCI9052 startup initialization information for initializing the PCI9052, so that the driver can be loaded normally when the computer is started.
The utility model is realized by the following steps based on the DC110V digital quantity acquisition card of the CPCI bus:
1) inserting the digital quantity acquisition card into a CPCI computer through connectors J1 and J2, electrically starting the CPCI computer, and installing a digital quantity acquisition card driver after starting; the driver is only needed to be installed once, and then is automatically loaded after being electrified;
2) the input interface connector (adopting a D-SUB50 connector J3) is connected with each internal acquisition channel, and each path consists of a digital quantity input end and a ground; a cable with a matched D-SUB50 connector is inserted into J3, and the other end of the cable selects a certain path as an experimental object and is connected to a DC110V power supply through a breaker; the circuit breaker is in an off state at the beginning;
3) reading data acquired by the optical coupling isolation and acquisition circuit through a command, and acquiring 16 paths of all-0 data at the moment;
4) the channel self-checking is realized by the self-checking control circuit through a command, the acquired data is read, and at the moment, 16 paths of all-1 data are acquired;
5) recovering the channel to be in a non-power state through a command, reading the acquired data, and acquiring 16 paths of all-0 data;
6) a certain DC110V power supply is connected through a breaker, the acquired data is read, the corresponding position of the acquired 16-bit data is 1, and the other positions are 0;
7) the breaker is disconnected, and the acquired data is read, and 16 paths of results are all 0 data;
8) the data collected through the steps are stored in the CPCI computer and are provided with time stamps for archiving to be checked.
And when self-checking is carried out, a reference voltage is given, all the channels collected when the self-checking passes are in a high level 1, and the signals of all the channels collected after the self-checking control signals disappear are in a low level 0, so that the self-checking channel is indicated to be functional. If a certain channel is connected with a 110V power supply, the channel will become high level, and other channels are low level, which indicates that the acquisition card can work normally.
The utility model is based on the DC110V digital acquisition card of CPCI bus, as the expansion board of CPCI computer, can effectively acquire the digital input information of DC110V of the subway vehicle-mounted relay, and then monitor the state of the vehicle-mounted relay; when the train brakes, the running direction, the opening and closing of the train door, the traction command and the lifting pantograph are abnormal, the fault position can be quickly positioned, and the fault diagnosis effect is achieved.
The utility model has the characteristic of preventing the reverse connection of external input, and can achieve the purpose of protecting the whole digital quantity acquisition channel when external misoperation occurs. Meanwhile, the utility model can realize the self-checking function, and when the input channel of the acquisition card has a fault, the acquisition card can be isolated from the system, thereby not influencing the monitored relay node. The utility model adopts the photoelectric isolation measure, reduces the influence of field intensity on the CPCI computer and improves the reliability of the operation of the CPCI computer.
Claims (9)
1. A DC110V digital quantity acquisition card based on CPCI bus is characterized in that: the device comprises a self-checking control circuit, a digital quantity conditioning circuit, an optical coupling isolation and acquisition circuit, a tri-state buffer, a PCI bridge and a peripheral circuit, wherein the digital quantity conditioning circuit receives relay contact information through an external input interface connector, and the output end of the digital quantity conditioning circuit is connected with the optical coupling isolation and acquisition circuit; the output end of the optical coupling isolation and acquisition circuit is connected to the PCI bridge through a tri-state buffer; the PCI bridge performs data interaction with the CPCI computer through a PCI bus; the input end of the self-checking control circuit is connected with a control signal of the PCI bridge, and the output end of the self-checking control circuit is connected with the digital quantity conditioning circuit.
2. The CPCI bus-based DC110V digital quantity acquisition card according to claim 1, wherein: the self-checking control circuit comprises a solid-state relay and a triode, wherein the base electrode of the triode is connected with a user IO pin of the PCI bridge, the collector electrode of the triode is connected with the negative electrode of the control end of the solid-state relay, and the emitter electrode of the triode is grounded; the anode of the control end of the solid-state relay is connected with a CPCI working power supply, the anode of the load end is connected with a DC110V reference power supply, and the cathode of the load end is connected with the input end of the digital quantity conditioning circuit through a diode.
3. The CPCI bus-based DC110V digital quantity acquisition card according to claim 2, wherein: and a current-limiting resistor is connected between the base of the triode and the user IO pin of the PCI bridge.
4. The CPCI bus-based DC110V digital quantity acquisition card according to claim 2, wherein: a transient suppression diode and a filter capacitor are arranged between the anode of the load end of the solid-state relay and the DC110V power ground.
5. The CPCI bus-based DC110V digital quantity acquisition card according to claim 1, wherein: the digital quantity conditioning circuit comprises a voltage stabilizing diode, a current limiting resistor and a sampling resistor, wherein the sampling resistor is connected between the positive electrode and the negative electrode of the input end of the photoelectric coupler, one end of the sampling resistor, which is connected with the negative electrode of the input end of the photoelectric coupler, is connected to the grounding end of the external input interface, the other end of the sampling resistor is connected with the input end of the external input interface connector through the voltage stabilizing diode and the current limiting resistor, and the sampling resistor is also connected with the negative electrode of the load end of the self-checking control circuit.
6. A DC110V digital quantity acquisition card based on CPCI bus according to claim 5, wherein: and a diode with a voltage reverse protection function is arranged between the voltage stabilizing diode and the negative electrode of the load end of the self-checking control circuit.
7. A DC110V digital quantity acquisition card based on CPCI bus according to claim 5, wherein: a transient suppression diode and a filter capacitor are connected between the input of the external input interface connector and the DC110V power ground.
8. A DC110V digital quantity acquisition card based on CPCI bus according to claim 5, wherein: and two ends of the input end of the photoelectric coupler are connected with protective diodes.
9. A DC110V digital quantity acquisition card based on CPCI bus according to claim 5, wherein: the voltage stabilizing diodes are two first to second voltage stabilizing diodes connected in series.
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| CN202122044623.7U CN215706376U (en) | 2021-08-27 | 2021-08-27 | DC110V digital quantity acquisition card based on CPCI bus |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113562022A (en) * | 2021-08-27 | 2021-10-29 | 沈阳铁路信号有限责任公司 | DC110V digital quantity acquisition card based on CPCI bus |
| CN114894046A (en) * | 2022-05-23 | 2022-08-12 | 西安微电子技术研究所 | Universal switching value pulse intelligent interface test card |
| CN115384578A (en) * | 2022-07-11 | 2022-11-25 | 上海电气泰雷兹交通自动化系统有限公司 | Signal acquisition driving device of acquisition driving integrated system for realizing redundancy configuration |
-
2021
- 2021-08-27 CN CN202122044623.7U patent/CN215706376U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113562022A (en) * | 2021-08-27 | 2021-10-29 | 沈阳铁路信号有限责任公司 | DC110V digital quantity acquisition card based on CPCI bus |
| CN114894046A (en) * | 2022-05-23 | 2022-08-12 | 西安微电子技术研究所 | Universal switching value pulse intelligent interface test card |
| CN114894046B (en) * | 2022-05-23 | 2023-11-10 | 西安微电子技术研究所 | Universal switching value pulse intelligent interface test card |
| CN115384578A (en) * | 2022-07-11 | 2022-11-25 | 上海电气泰雷兹交通自动化系统有限公司 | Signal acquisition driving device of acquisition driving integrated system for realizing redundancy configuration |
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