CN214539839U

CN214539839U - Contactor monitoring device

Info

Publication number: CN214539839U
Application number: CN202120498779.XU
Authority: CN
Inventors: 王金龙; 谭佳; 吴飞; 杨鹏; 余明皓
Original assignee: WUHAN CHANGHAI ELECTRICAL TECHNOLOGY DEVELOPMENT CO LTD
Current assignee: WUHAN CHANGHAI ELECTRICAL TECHNOLOGY DEVELOPMENT CO LTD
Priority date: 2021-03-09
Filing date: 2021-03-09
Publication date: 2021-10-29
Anticipated expiration: 2031-03-09

Abstract

The utility model discloses a contactor monitoring device, which comprises a shell and a PCB (printed circuit board) arranged inside the shell, wherein the PCB is provided with a core board, a power supply, a clock controller, a data storage module, a USB (universal serial bus) communication module, an RS232 communication module, an analog-to-digital converter, a contactor coil voltage acquisition circuit module, a contactor coil current acquisition circuit module and a contactor auxiliary contact signal acquisition circuit module; the core board is electrically connected with the power supply, the clock controller, the data storage module, the USB communication module, the RS232 communication module, the analog-to-digital converter and the contactor auxiliary contact signal acquisition circuit module respectively, and the analog-to-digital converter is electrically connected with the contactor coil voltage acquisition circuit module and the contactor coil current acquisition circuit module respectively. The utility model has the advantages that: the structure is simple, the operation is convenient, the size is small and exquisite, and the carrying is flexible and convenient; the contactor can be used for monitoring the working state of a single contactor or a plurality of contactors, the working efficiency is high, and the fault reason is accurately and quickly found.

Description

Contactor monitoring device

Technical Field

The utility model relates to a locomotive contactor technical field, specific saying so relates to a contactor monitoring devices, its mainly used rail vehicle, especially electric locomotive, the on-vehicle direct current contactor operating condition's of EMUs real-time supervision.

Background

The vehicle-mounted direct current contactor belongs to important component units in a power supply and distribution system of a locomotive and a motor train unit, and the condition of the vehicle-mounted direct current contactor is directly related to the reliability and the safety of the operation of the locomotive and the motor train unit, so that the monitoring of the operation condition of the contactor and the searching of fault reasons are very important.

At present, no device for independently monitoring the contactor exists on domestic locomotives and motor train units, the main reason is that the locomotives and the motor train units adopt integrated monitoring systems, but the integrated monitoring systems only judge the state of the contactor by monitoring auxiliary contact signals of the contactor, namely: once the state abnormity of the auxiliary contact is detected, the contactor is judged to be in fault by force, but the fault is the actual situation, and the fault can be caused by the unstable power supply of the electromagnetic coil of the contactor. Therefore, in view of the difficulty of meeting the requirements of monitoring the operating state of the contactor and troubleshooting with the integrated monitoring system, it is necessary to develop a monitoring device for independently detecting the state of the contactor.

SUMMERY OF THE UTILITY MODEL

To the problem among the background art, the utility model aims to provide an independent, the more accurate contactor monitoring devices of failure reason investigation.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a contactor monitoring device comprises a shell and a PCB arranged in the shell, wherein a core board, a power supply, a clock controller, a data storage module, a USB communication module, an RS232 communication module, an analog-to-digital converter, a contactor coil voltage acquisition circuit module, a contactor coil current acquisition circuit module and a contactor auxiliary contact signal acquisition circuit module are arranged on the PCB; the core board is electrically connected with the power supply, the clock controller, the data storage module, the USB communication module, the RS232 communication module, the analog-to-digital converter and the contactor auxiliary contact signal acquisition circuit module respectively, and the analog-to-digital converter is electrically connected with the contactor coil voltage acquisition circuit module and the contactor coil current acquisition circuit module respectively.

According to the technical scheme, the intelligent power supply device further comprises a power socket, a USB socket, an RS232 port, a navigation socket, a power switch and a current sensor which are arranged outside the shell; the power socket, the USB socket, the RS232 port, the navigation socket, the power switch and the current sensor are correspondingly embedded in the shell wall of the shell, the power socket and the power switch are correspondingly and electrically connected with the power supply, the USB socket is also correspondingly and electrically connected with the USB communication module, the RS232 port is also correspondingly and electrically connected with the RS232 communication module, the navigation socket is also correspondingly and electrically connected with the contactor coil voltage acquisition circuit module and the contactor auxiliary contact signal acquisition circuit module respectively, and the current sensor is also correspondingly and electrically connected with the contactor coil current acquisition circuit module;

wherein, the number of the current sensors is N, and N is an integer more than or equal to 1.

According to the technical scheme, the core board is provided with the CPU, the general GPIO interface, the SPI interface and the I²The interface comprises a C interface, a TF card interface, a USB2.0/3.0 interface and a UART interface;

the general GPIO interface is electrically connected with the CPU and the contactor auxiliary contact signal acquisition circuit module respectively;

the SPI interface is electrically connected with the CPU and the analog-to-digital converter respectively;

said I²The interface C is electrically connected with the CPU and the clock controller respectively;

the TF card interface is electrically connected with the CPU and the data storage module respectively;

the USB2.0/3.0 interface is electrically connected with the CPU and the USB communication module respectively;

the UART interface is electrically connected with the CPU and the RS232 communication module respectively.

According to the technical scheme, the power supply comprises an EMI filtering template and a DC-DC power supply module, the input end of the EMI filtering template is correspondingly connected with a power socket, the output end of the EMI filtering template is correspondingly connected with the DC-DC power supply module, and the DC-DC power supply module is connected with the core board and used for supplying power to the whole core board.

According to the technical scheme, the data storage module comprises a TF card controller, a TF card seat and a TF memory card, the TF memory card is inserted into the TF card seat, the TF card seat is electrically connected with the TF card controller, and the TF card controller is electrically connected with the CPU through a TF card interface.

According to the technical scheme, the USB communication module comprises a USB controller and an external USB interface, the input end of the USB controller is electrically connected with the CPU through the USB2.0/3.0 interface, and the output end of the USB controller is electrically connected with the USB socket through the external USB interface.

According to the technical scheme, the RS232 communication module comprises the RS232 converter and an external RS232 serial port, the input end of the RS232 converter is electrically connected with the CPU through the UART interface, and the output end of the RS232 converter is electrically connected with the RS232 port through the external RS232 serial port.

According to the technical scheme, the contactor coil voltage acquisition circuit module comprises N paths of voltage acquisition interfaces, N paths of resistance voltage division circuits A and N paths of isolation operational amplifier circuits; the input ends of the N voltage acquisition interfaces are correspondingly connected with the N contactors to be tested through the air sockets, and the output ends of the N voltage acquisition interfaces are correspondingly connected with the N resistance voltage division circuits A; the input ends of the N paths of isolation operational amplifier circuits are correspondingly connected with the N paths of resistance voltage division circuits A, and the output ends of the N paths of isolation operational amplifier circuits are correspondingly connected with the analog-to-digital converter;

the contactor coil current acquisition circuit module comprises N current sensor interfaces and N resistance voltage division circuits B; the input ends of the N paths of current sensor interfaces are correspondingly connected with the N current sensors, and the output ends of the N paths of current sensor interfaces are correspondingly connected with the analog-to-digital converter through the N paths of resistance voltage division circuits B;

the analog-to-digital converter is an M-channel analog-to-digital converter, M/2 channels are used for being communicated with N isolating operational amplifier circuits in the contactor coil voltage acquisition circuit module in a one-to-one corresponding mode, and the other M/2 channels are used for being communicated with N resistance voltage division circuits B in the contactor coil current acquisition circuit module in a one-to-one corresponding mode;

when the device is used, each current sensor correspondingly penetrates through a cable which is connected with a contactor to be tested and a locomotive control box;

wherein M is 2N, and N is an integer more than or equal to 1;

each path of voltage acquisition interface is correspondingly used for acquiring the voltage at two ends of an electromagnetic coil of a contactor to be tested and transmitting the voltage to a path of resistance voltage division circuit A connected with the voltage acquisition interface;

each path of resistance voltage division circuit A is correspondingly used for carrying out voltage division processing on the voltage at two ends of the electromagnetic coil of the corresponding contactor to be tested, which is acquired by the corresponding voltage acquisition interface, and then outputting a low-voltage signal to one path of isolation operational amplifier circuit connected with the low-voltage signal;

each path of isolation operational amplifier circuit is correspondingly used for carrying out isolation conversion on the low-voltage signals transmitted by the corresponding resistance voltage division circuit A and then transmitting the low-voltage signals to the analog-to-digital converter;

each path of current sensor is correspondingly used for collecting the current of an electromagnetic coil of the contactor to be tested, and generates a voltage signal after being processed and transmits the voltage signal to a path of current sensor interface corresponding to the voltage signal;

each path of current sensor interface is correspondingly used for transmitting the current signal acquired by the corresponding current sensor to a path of resistance voltage division circuit B connected with the current sensor;

each path of resistance voltage division circuit B is correspondingly used for carrying out voltage division processing on the current signals acquired by the corresponding current sensor interface and then transmitting the current signals to the analog-to-digital converter;

the analog-to-digital converters are respectively used for performing analog-to-digital conversion on the signals transmitted by the isolation operational amplifier circuit and outputting digital signals to a CPU (central processing unit) of the core board, the CPU calculates the real voltage values at two ends of the electromagnetic coil of the contactor to be tested and is used for performing analog-to-digital conversion on the signals transmitted by the resistance voltage dividing circuit B and outputting the digital signals to the CPU of the core board, and the CPU calculates the real current value in the electromagnetic coil of the contactor to be tested.

According to the technical scheme, the contactor auxiliary contact signal acquisition circuit module comprises N paths of I/O acquisition interfaces and a photoelectric isolation circuit; the input ends of the N paths of I/O acquisition interfaces are correspondingly communicated with the N contactors to be tested through the aerial sockets, and the output ends of the N paths of I/O acquisition interfaces are correspondingly communicated with the photoelectric isolation circuit; the photoelectric isolation circuit is correspondingly communicated with the CPU through a general purpose GPIO interface; wherein N is an integer of more than or equal to 1;

and each path of I/O acquisition interface is correspondingly used for acquiring the auxiliary contact state signal of one contactor to be tested.

Compared with the prior art, the utility model has the advantages that: 1) the structure is simple, the operation is convenient, the size is small and exquisite, and the carrying is flexible and convenient; 2) can be used for monitoring the operating condition of single contactor, also can be used for monitoring the operating condition of a plurality of contactors simultaneously, work efficiency is high, measures accurately.

Drawings

Fig. 1 is a schematic view of an external structure of an embodiment of a contactor monitoring device according to the present invention;

FIG. 2 is a schematic circuit diagram of an internal structure based on the embodiment of the contactor monitoring device of FIG. 1;

FIG. 3 is a diagram of one embodiment of the resistor divider circuit A and the isolation operational amplifier circuit of FIG. 2;

FIG. 4 is a diagram of one embodiment of the resistor divider circuit B of FIG. 2;

FIG. 5 is an embodiment of the analog-to-digital converter of FIG. 2;

FIG. 6 is an embodiment of the optoelectronic isolation circuit of FIG. 2;

FIG. 7 is a block diagram of a single-channel monitoring circuit for monitoring the operating condition of a single contactor based on the embodiment of the contactor monitoring device of FIG. 1;

fig. 8 is a logic diagram of event logging for an embodiment of the contactor monitoring device of the present invention;

description of reference numerals: 1. a housing; 2. a PCB board; 3. a core board; 3.1, CPU; 3.2, generalA GPIO interface is used; 3.3, SPI interface; 3.4, I²Interface C; 3.5, TF card interface; 3.6, USB2.0/3.0 interface; 3.7, a UART interface; 4. a power supply; 4.1, an EMI filtering module; 4.2, a DC-DC power supply module; 5. a clock controller; 6. a data storage module; 6.1, a TF card controller; 6.2, TF card seat; 7. a USB communication module; 7.1, a USB controller; 7.2, an external USB interface; 8. an RS232 communication module; 8.1, RS232 converter; 8.2, an external RS232 serial port; 9. an analog-to-digital converter; 10. a contactor coil voltage acquisition circuit module; 10.1, a voltage acquisition interface; 10.2, a resistance voltage division circuit A; 10.3, isolating the operational amplifier circuit; 11. a contactor coil current acquisition circuit module; 11.1 current sensor interface; 11.2, a resistance voltage division circuit B; 12. the contactor auxiliary contact signal acquisition circuit module; 12.1, an I/O acquisition interface; 12.2, a photoelectric isolation circuit; 13. a power outlet; 14. a USB socket; 15. an RS232 port; 16. an air socket; 17. a power switch; 18. a current sensor; 100. a contactor; 200. locomotive machine case.

Detailed Description

In order to make the technical means, the creation features, the achievement purposes and the functions of the present invention easy to understand and understand, how to implement the present invention is further explained below with reference to the accompanying drawings and the detailed description.

Referring to fig. 1 and 2, a specific embodiment of the contactor monitoring device of the present invention is shown: the intelligent power supply comprises a shell 1, a PCB 2 arranged in the shell 1, and a power socket 13, a USB socket 14, an RS232 port 15, an aviation socket 16, a

power switch

17 and 4 current sensors 18 which are arranged outside the shell 1; the PCB 2 is provided with a core board 3, a power supply 4, a clock controller 5, a data storage module 6, a USB communication module 7, an RS232 communication module 8, an analog-to-digital converter 9, a contactor coil voltage acquisition circuit module 10, a contactor coil current acquisition circuit module 11 and a contactor auxiliary contact signal acquisition circuit module 12;

the core board 3 is electrically connected with the power supply 4, the clock controller 5, the data storage module 6, the USB communication module 7, the RS232 communication module 8, the analog-to-digital converter 9 and the contactor auxiliary contact signal acquisition circuit module 12 correspondingly;

the power supply device 4 is respectively and correspondingly electrically connected with the power socket 13 and the power switch 17;

the USB communication module 7 and the RS232 communication module 8 are electrically connected with the USB socket 14 and the RS232 port 15 correspondingly in sequence;

the analog-to-digital converter 9 is respectively and correspondingly electrically connected with the contactor coil voltage acquisition circuit module 10 and the contactor coil current acquisition circuit module 11;

the contactor coil voltage acquisition circuit module 10 and the contactor auxiliary contact signal acquisition circuit module 12 are correspondingly electrically connected with the air interface 16;

the contactor coil current acquisition circuit module 11 is correspondingly electrically connected with 4 current sensors 18.

Specifically, in the embodiment, referring to fig. 2, the core board 3 includes a CPU3.1 and various communication interfaces, which are a general GPIO interface 3.2, an SPI interface 3.3, and an I interface in sequence²The CPU comprises a C interface 3.4, a TF card interface 3.5, a USB2.0/3.0 interface 3.6 and a UART interface 3.7, wherein the communication interfaces are used for realizing the input, processing and output of the CPU3.1 to various types of data;

the core board 3 is used for communicating the CPU3.1 with the contactor auxiliary contact signal acquisition circuit module 12 through a general GPIO interface 3.2 so as to realize the calculation and reading of the auxiliary contact state signal of the contactor to be tested, which is acquired by the contactor auxiliary contact signal acquisition circuit module 12, and further realize the monitoring of the on-off state of the auxiliary contact of the contactor to be tested;

the core board 3 is used for communicating the CPU3.1 and the analog-to-digital converter 9 through the SPI interface 3.3 to realize calculation processing of the digital signal converted by the analog-to-digital converter 9, thereby calculating the coil voltage and the coil current of the corresponding contactor to be tested;

the core board 3 is used for passing through I²A C interface 3.4 for communicating the CPU3.1 with the clock controller 5 to set or read clock information via I2C communication protocol;

the core board 3 is used for communicating the TF card controller in the CPU3.1 and the data storage module 6 through the TF card interface 3.5 to realize the read-write operation of a TF memory card (not shown in the figure), and further realize data storage, in the embodiment of the utility model, the data storage module 6 is mainly used for storing data including the number of times of opening and closing a switch of a contactor, the moment of instruction of opening and closing a switch, the moment of the opening and closing a switch in place, the moment of data abnormality and the like in real time;

the core board 3 is used for communicating the CPU3.1 with a USB controller in the USB communication module 7 through a USB2.0/3.0 interface 3.6 to realize the read-write operation of the USB flash disk and further realize data dump;

the core board 3 is used for communicating the CPU3.1 with the RS232 converter in the RS232 communication module 8 through the UART interface 3.7 to realize external RS232 communication.

Specifically, in the embodiment, referring to fig. 2, the power supply 4 includes an EMI filter module 4.1 and a DC-DC power supply module 4.2; the input end of the EMI filtering module 4.1 is respectively communicated with the power socket 13 and the power switch 17, the output end is electrically communicated with the DC-DC power module 4.2, and the DC-DC power module 4.2 is communicated with the core board 3; when the direct current detection device works, external direct current is filtered by the EMI filtering module 4.1 and then is input into the DC-DC power supply 4.2, is converted by the DC-DC power supply 4.2 and then is input into the core board 3, and then the core board 3 supplies power to the whole detection device.

Specifically, in this embodiment, referring to fig. 2, the data storage module 6 includes a TF card controller 6.1, a TF card socket 6.2 and a TF memory card (not output in the figure), where the TF memory card is correspondingly inserted into the TF card socket 6.2, the TF card socket 6.2 is correspondingly electrically connected to the TF card controller 6.1, and the TF card controller 6.1 is electrically connected to the CPU3.1 through a TF card interface 3.5.

Specifically, in this embodiment, referring to fig. 2, the USB communication module 7 includes a USB controller 7.1 and an external USB interface 7.2, wherein an input end of the USB controller 7.1 is electrically connected to the CPU3.1 through the USB2.0/3.0 interface 3.6, and an output end is electrically connected to the USB socket 14 through the external USB interface 7.2; in the embodiment of the present invention, the USB socket 14 can dump the data stored in the data storage module 6 to the ground analysis system for further analysis.

Specifically, in this embodiment, referring to fig. 2, the RS232 communication module 8 includes an RS232 converter 8.1 and an external RS232 serial port 8.2, wherein an input end of the RS232 converter 8.1 is electrically connected to the CPU3.1 through the UART interface 3.7, and an output end is electrically connected to the RS232 port 15 through the external RS232 serial port 8.2.

Specifically, in this embodiment, referring to fig. 2, the contactor coil voltage acquisition circuit module 10 includes 4 voltage acquisition interfaces 10.1, 4 resistance voltage division circuits a10.2, and 4 isolation operational amplifier circuits 10.3; the input end of the 4-path voltage acquisition interface 10.1 is correspondingly connected with the 4 contactors to be tested 100 through the navigation socket 16, and the output end is correspondingly connected with the 4-path resistance voltage division circuit A10.2; the input end of the 4-path isolation operational amplifier circuit 10.3 is correspondingly connected with the 4-path resistance voltage division circuit A10.2, and the output end is correspondingly connected with the analog-to-digital converter 9; when the contactor works, each path of voltage acquisition interface 10.1 is correspondingly used for acquiring the voltage at two ends of an electromagnetic coil of a contactor 100 to be tested and transmitting the voltage to a path of resistance voltage division circuit A10.2 connected with the voltage acquisition interface; each path of resistance voltage division circuit A10.2 is correspondingly used for carrying out voltage division processing on the voltage at two ends of the electromagnetic coil of the corresponding contactor 100 to be tested, which is acquired by the corresponding voltage acquisition interface 10.1, and then outputting a low-voltage signal to one path of isolation operational amplifier circuit 10.3 connected with the low-voltage signal; each path of isolation operational amplifier circuit 10.3 is used for carrying out isolation conversion on the low-voltage signal transmitted by the corresponding resistance voltage division circuit a10.2, then transmitting the low-voltage signal to the analog-to-digital converter 9, carrying out analog-to-digital conversion by the analog-to-digital converter 9, then outputting a digital signal to the CPU3.1, and finally calculating the real voltage value at the two ends of the electromagnetic coil of the contactor 100 to be tested by the CPU.

Specifically, in this embodiment, referring to fig. 2, the contactor coil current collecting circuit module 11 includes 4 current sensor interfaces 11.1 and 4 resistance voltage dividing circuits B11.2; the input end of the 4-path current sensor interface 11.1 is correspondingly connected with the 4 current sensors 18, and the output end is correspondingly connected with the 4-path resistance voltage division circuit B11.2; the 4 paths of resistance voltage division circuits B11.2 are correspondingly connected with the analog-to-digital converter 9; when the contactor works, each current sensor 18 is correspondingly used for collecting the current of an electromagnetic coil of the contactor 100 to be tested, and voltage signals are generated after processing and are transmitted to one path of current sensor interface 11.1 corresponding to the voltage signals; each path of current sensor interface 11.1 is correspondingly used for transmitting a voltage signal generated after being processed by the corresponding current sensor 18 to a path of resistance voltage division circuit B11.2 connected with the current sensor interface; each path of the resistance voltage division circuit B11.2 is used for transmitting a current signal acquired by the corresponding current sensor interface 11.1 to the analog-to-digital converter 9, performing analog-to-digital conversion by the analog-to-digital converter 9, outputting a digital signal to the CPU3.1, and finally calculating the real current value in the electromagnetic coil of the contactor 100 to be tested by the CPU.

Specifically, in this embodiment, referring to fig. 2, the analog-to-digital converter 9 is an 8-channel analog-to-digital converter (for example, an AD7888 analog-to-digital converter as shown in fig. 5 may be used), and in this embodiment, 4 channels in the analog-to-digital converter 9 are used for being in one-to-one communication with 4 isolation operational amplifier circuits 10.3 in the contactor coil voltage acquisition circuit module 10, and the other 4 channels are used for being in one-to-one communication with N resistance voltage division circuits B11.2 in the contactor coil current acquisition circuit module 11.

Specifically, in the present embodiment, referring to fig. 2, each current sensor 18 is a through-hole type current sensor, and in operation, each current sensor 18 is correspondingly disposed on a cable connecting a contactor 100 to be tested and a locomotive control box 200, so as to obtain the current flowing from the locomotive control box 200 to the coil of the contactor 100 to be tested.

Specifically, in this embodiment, referring to fig. 2, the contactor auxiliary contact signal acquisition circuit module 12 includes 4I/O acquisition interfaces 12.1 and a photoelectric isolation circuit 12.2; the input ends of the 4 paths of I/O acquisition interfaces 12.1 are correspondingly connected with the 4 contactors to be tested 100 through the air jacks 16, and the output ends are correspondingly communicated with the photoelectric isolation circuit 12.2; the photoelectric isolation circuit 12.2 is correspondingly communicated with the CPU3.1 through a general purpose GPIO interface 3.2; during operation, each I/O acquisition interface is correspondingly used to acquire an auxiliary contact status signal of one contactor 100 to be tested.

In this embodiment, the resistance voltage-dividing circuit a10.2 may adopt a circuit structure as shown in fig. 3, or may adopt any one of other commercially available circuit structures having a resistance voltage-dividing function; the isolation operational amplifier circuit 10.3 may adopt a circuit structure as shown in fig. 3, or may adopt any one of other circuit structures existing in the market and having an isolation operational amplifier function; the resistance voltage-dividing circuit B11.2 may adopt a circuit structure as shown in fig. 4, or may adopt any one of other commercially available circuit structures having a resistance voltage-dividing function; the optoelectronic isolation circuit 12.2 can adopt the circuit structure shown in fig. 6, and can also adopt any other circuit structure with optoelectronic isolation function existing in the market.

Referring to fig. 7, a schematic diagram of a circuit for monitoring the operating status of a single contactor according to the above embodiment is shown.

Referring to fig. 8, a logic diagram of event recording recorded when a single vehicle-mounted DC contactor with a rated control voltage of DC110V is monitored (included) for operating states based on the contactor monitoring device provided by the present invention is shown.

In fig. 8: a dashed frame on the left side indicates the closing process of the contactor; the broken line frame on the right side shows the opening process of the contactor; point A represents the moment when the voltage at two ends of the contactor coil reaches 22V; point B represents the moment when the contactor coil voltage rises to 84V; c represents the moment when the voltage of the contactor coil is reduced to 84V; d represents the moment when the voltage of the contactor coil is reduced to 11V; e represents the moment when the contactor is switched in place and the state of the auxiliary contact is changed; f, switching off of the contactor is in place, and the state of the auxiliary contact is changed at the moment.

As can be seen from fig. 8, when the contactor is closed, the coil voltage rises from 0V to 110V while the auxiliary contact switching state is switched from low level to high level; when the contactor is opened, the coil voltage is reduced from 110V to 0V, and the switch state of the auxiliary contact is switched from high level to low level. Based on this, when the action of the contactor is abnormal, the reason for the abnormality of the contactor can be quickly found out by comparing the voltage waveform of the coil with the state change time of the auxiliary contact.

Taking this fig. 8 as an example, it is specifically explained how we can quickly find out the cause of the abnormality of the contactor by comparing the voltage waveform of the coil with the state change time of the auxiliary contact:

when the system gives a contactor closing command, when the contactor coil voltage rises from 0V to U, the monitoring device may detect the following abnormal conditions:

1. when the coil voltage U is detected to be less than 22V, the coil power supply fault can be logically judged at the moment;

2. the state of the auxiliary contact is kept at a low level, and when the coil voltage is detected to be more than or equal to 22V and less than 84V, the coil under-voltage abnormality can be logically judged;

3. the state of the auxiliary contact is converted from low level to high level, and when the coil voltage is detected to be more than or equal to 22V and U is detected to be less than 84V, the logic judgment can be made as the under-voltage action of the contactor;

4. the state of the auxiliary contact is kept at a low level, and when the voltage of the coil is detected to be more than or equal to 84V and less than 126.5V, the fault of the contactor can be logically judged;

5. the state of the auxiliary contact is converted from low level to high level, but the time interval exceeds 1s, the coil voltage is detected to be more than or equal to 84V and less than 126.5V, and the contactor can be logically judged to be abnormal at the moment;

6. when the coil voltage U is detected to be more than or equal to 126.5V, the coil overvoltage can be logically judged to be abnormal.

When the system gives a contactor opening command, when the contactor coil voltage drops from 110V to U, the monitoring device may detect the following abnormal conditions:

1. when the coil voltage is detected to be more than or equal to 84V and less than 110V, the coil power failure abnormality can be logically judged at the moment;

2. when the coil voltage is detected to be more than or equal to 11V and less than 84V, the coil voltage can be logically judged to be abnormal;

3. when the coil voltage U is detected to be less than 11V, the state of the auxiliary contact is kept at a high level, and the fault of the contactor can be logically judged at the moment;

4. when the coil voltage U is detected to be less than 11V, the state of the auxiliary contact is converted from high level to low level, but the time interval exceeds 1s, and the contactor can be logically judged to be abnormal.

Finally, the above description is only the embodiments of the present invention, not limiting the scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.

Claims

1. The utility model provides a contactor monitoring devices, includes casing (1) and sets up PCB board (2) inside casing (1), its characterized in that: the PCB (2) is provided with a core board (3), a power supply (4), a clock controller (5), a data storage module (6), a USB communication module (7), an RS232 communication module (8), an analog-to-digital converter (9), a contactor coil voltage acquisition circuit module (10), a contactor coil current acquisition circuit module (11) and a contactor auxiliary contact signal acquisition circuit module (12);

the core board (3) is respectively electrically connected with the power supply (4), the clock controller (5), the data storage module (6), the USB communication module (7), the RS232 communication module (8), the analog-to-digital converter (9) and the contactor auxiliary contact signal acquisition circuit module (12), and the analog-to-digital converter (9) is respectively electrically connected with the contactor coil voltage acquisition circuit module (10) and the contactor coil current acquisition circuit module (11).

2. The contactor monitoring device as claimed in claim 1, wherein: the portable power supply is characterized by further comprising a power socket (13), a USB socket (14), an RS232 port (15), an air socket (16), a power switch (17) and a current sensor (18), wherein the power socket is arranged outside the shell (1); the power socket (13), the USB socket (14), the RS232 port (15), the navigation socket (16), the power switch (17) and the current sensor (18) are correspondingly embedded on the shell wall of the shell (1), the power socket (13) and the power switch (17) are correspondingly and electrically connected with the power supply (4), the USB socket (14) is correspondingly and electrically connected with the USB communication module (7), the RS232 port (15) is correspondingly and electrically connected with the RS232 communication module (8), the navigation socket (16) is correspondingly and electrically connected with the contactor coil voltage acquisition circuit module (10) and the contactor auxiliary contact signal acquisition circuit module (12) respectively, and the current sensor (18) is correspondingly and electrically connected with the contactor coil current acquisition circuit module (11);

wherein the number of the current sensors (18) is N, and N is an integer more than or equal to 1.

3. The contactor monitoring device as claimed in claim 2, wherein: the core board (3) is provided with a CPU (3.1), a general purpose GPIO interface (3.2), an SPI interface (3.3) and an I²A C interface (3.4), a TF card interface (3.5), a USB2.0/3.0 interface (3.6) and a UART interface (3.7);

the general GPIO interface (3.2) is respectively and electrically connected with the CPU (3.1) and the contactor auxiliary contact signal acquisition circuit module (12);

the SPI interface (3.3) is electrically connected with the CPU (3.1) and the analog-to-digital converter (9) respectively;

said I²The C interface (3.4) is electrically connected with the CPU (3.1) and the clock controller (5) respectively;

the TF card interface (3.5) is electrically connected with the CPU (3.1) and the data storage module (6) respectively;

the USB2.0/3.0 interface (3.6) is electrically connected with the CPU (3.1) and the USB communication module (7) respectively;

the UART interface (3.7) is electrically connected with the CPU (3.1) and the RS232 communication module (8) respectively.

4. The contactor monitoring device as claimed in claim 2, wherein: the power supply (4) comprises an EMI filtering template (4.1) and a DC-DC power supply module (4.2), wherein the input end of the EMI filtering template (4.1) is electrically connected with a power socket (13), the output end of the EMI filtering template is electrically connected with the DC-DC power supply module (4.2), and the DC-DC power supply module (4.2) is electrically connected with the core board (3).

5. The contactor monitoring device as claimed in claim 3, wherein: the data storage module (6) comprises a TF card controller (6.1), a TF card seat (6.2) and a TF memory card, the TF memory card is inserted into the TF card seat (6.2), the TF card seat (6.2) is electrically connected with the TF card controller (6.1), and the TF card controller (6.1) is electrically connected with the CPU (3.1) through a TF card interface (3.5).

6. The contactor monitoring device as claimed in claim 3, wherein: the USB communication module (7) comprises a USB controller (7.1) and an external USB interface (7.2), wherein the input end of the USB controller (7.1) is electrically connected with the CPU (3.1) through a USB2.0/3.0 interface (3.6), and the output end of the USB communication module is electrically connected with the USB socket (14) through the external USB interface (7.2).

7. The contactor monitoring device as claimed in claim 3, wherein: RS232 communication module (8) contain RS232 converter (8.1) and external RS232 serial ports (8.2), the input of RS232 converter (8.1) pass through UART interface (3.7) with CPU (3.1) looks electric connection, the output is through external RS232 serial ports (8.2) and RS232 port (15) looks electric connection.

8. The contactor monitoring device as claimed in claim 3, wherein: the contactor coil voltage acquisition circuit module (10) comprises N paths of voltage acquisition interfaces (10.1), N paths of resistance voltage division circuits A (10.2) and N paths of isolation operational amplifier circuits (10.3); the input ends of the N voltage acquisition interfaces (10.1) are correspondingly connected with N contactors to be tested (100) through navigation jacks (16), and the output ends of the N voltage acquisition interfaces are correspondingly connected with the N resistance voltage division circuits A (10.2); the input ends of the N paths of isolation operational amplifier circuits (10.3) are correspondingly connected with the N paths of resistance voltage division circuits A (10.2), and the output ends of the N paths of isolation operational amplifier circuits are correspondingly connected with the analog-to-digital converter (9);

the contactor coil current acquisition circuit module (11) comprises N paths of current sensor interfaces (11.1) and N paths of resistance voltage division circuits B (11.2); the input ends of the N paths of current sensor interfaces (11.1) are correspondingly connected with the N current sensors (18), and the output ends of the N paths of current sensor interfaces are correspondingly connected with the analog-to-digital converter (9) through the N paths of resistance voltage division circuits B (11.2);

the analog-to-digital converter (9) is an M-channel analog-to-digital converter, M/2 channels are used for being communicated with N isolating operational amplifier circuits (10.3) in the contactor coil voltage acquisition circuit module (10) in a one-to-one corresponding mode, and the other M/2 channels are used for being communicated with N resistance voltage division circuits B (11.2) in the contactor coil current acquisition circuit module (11) in a one-to-one corresponding mode;

each current sensor (18) is a perforated current sensor, and when the device is used, each current sensor (18) correspondingly penetrates through a cable connecting a contactor (100) to be tested and a locomotive control box (200);

wherein M =2N, and N is an integer of 1 or more.

9. The contactor monitoring device as claimed in claim 3, wherein: the contactor auxiliary contact signal acquisition circuit module (12) comprises N paths of I/O acquisition interfaces (12.1) and a photoelectric isolation circuit (12.2); the input ends of the N paths of I/O acquisition interfaces (12.1) are correspondingly connected with N contactors to be tested (100) through navigation jacks (16), and the output ends of the N paths of I/O acquisition interfaces are correspondingly communicated with the photoelectric isolation circuit (12.2); the photoelectric isolation circuit (12.2) is correspondingly communicated with the CPU (3.1) through a general purpose GPIO (general purpose input/output) interface (3.2);

wherein N is an integer of 1 or more.