CN112824127B - Multi-path acquisition temperature limit protection device and method for train storage battery box - Google Patents

Multi-path acquisition temperature limit protection device and method for train storage battery box Download PDF

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CN112824127B
CN112824127B CN201911119423.4A CN201911119423A CN112824127B CN 112824127 B CN112824127 B CN 112824127B CN 201911119423 A CN201911119423 A CN 201911119423A CN 112824127 B CN112824127 B CN 112824127B
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data
temperature
storage battery
battery box
voltage
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CN112824127A (en
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徐溢斐
王伟
周卫成
梁彦锋
方鹏
张明帅
赵盼磊
鞠超越
杨会锋
朱凯
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Zhuzhou CRRC Times Electric Co Ltd
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Zhuzhou CRRC Times Electric Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
    • B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/04—Cutting off the power supply under fault conditions
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

The invention provides a multi-channel acquisition temperature limit protection device for a train storage battery box, which comprises: the temperature control device comprises a data acquisition module for acquiring multichannel thermosensitive voltage signals of the storage battery box in real time through a multichannel temperature acquisition circuit, a data transmission module for converting and isolating each channel of thermosensitive voltage signals, a power supply circuit for determining a plurality of temperature data according to the multichannel thermosensitive voltage signals and sending a protection control signal to control the storage battery according to each temperature data and a set temperature protection limit value, a data downloading module for providing an interface to download data, and a data storage module for carrying out standardized processing on the temperature data and the protection control signal data and storing the data. The device can be used for synchronously acquiring real-time temperature data of a plurality of positions of the storage battery box, flexibly controlling the power supply circuit of the storage battery based on the real-time temperature data of the plurality of positions, timely and accurately interrupting continuous temperature rise of the storage battery, and greatly reducing the probability of fire disasters of the storage battery.

Description

Multi-path acquisition temperature limit protection device and method for train storage battery box
Technical Field
The invention relates to the technical field of rail transit operation and maintenance, in particular to a multi-channel acquisition temperature limit protection device and method for a train storage battery box.
Background
In the field of rail transit, a storage battery is an important device of an auxiliary power supply system of a high-speed train, and when a main direct-current power supply of the train breaks down, the storage battery is required to provide power for all or part of direct-current loads, so that the safety and stability of a main control system of the train are guaranteed.
If the temperature of the storage battery box of the high-speed train is too high, the storage battery can be ignited, the normal power supply of the storage battery is influenced, the train running safety is seriously influenced, and therefore the temperature in the storage battery box needs to be monitored in real time.
Disclosure of Invention
To solve the above problems, the present invention provides a multi-sampling temperature limit protection device for a train battery box, which in one embodiment comprises:
the data acquisition module acquires multi-path thermosensitive voltage signals of the train storage battery box in real time through a multi-path temperature acquisition circuit;
the data transmission module is used for converting and transmitting the acquired thermosensitive voltage signals in an isolated manner;
the control module is used for determining a plurality of corresponding temperature data according to the received multi-channel thermosensitive voltage signals, and if any temperature data in the plurality of temperature data reaches a temperature protection limit value, a protection control signal is sent out to control a power supply circuit of the train storage battery to be disconnected;
the data storage module is used for carrying out standardized processing on the temperature data and the protection control signal data and storing the temperature data and the protection control signal data;
and the data downloading module is used for providing an interface for downloading the temperature data and the protection control signal data from the data storage module.
In one embodiment, each temperature acquisition circuit adopts a bridge circuit, and comprises: the VREF voltage source, the NTC thermistor, a first resistor connected between one end of the VREF voltage source and the NTC thermistor, a second resistor connected at the other end of the VREF voltage source, a third resistor connected between the NTC thermistor and the grounding end, and a fourth resistor connected between the second resistor and the grounding end.
And detecting a first voltage between one end of a VREF voltage source and the NTC thermistor and a second voltage between the second resistor and the fourth resistor.
In one embodiment, each of the temperature acquisition circuits is further configured to:
and detecting a first voltage between one end of a VREF voltage source and the NTC thermistor and a second voltage between the second resistor and the fourth resistor, and taking the voltage difference of the first voltage and the second voltage as a thermosensitive voltage signal of the temperature acquisition circuit corresponding to the storage battery box.
In one embodiment, the multi-path temperature acquisition circuit is configured to acquire temperature data of different set positions of the train storage battery box; wherein the set position is determined according to the distribution position of each storage battery in the storage battery box.
In one embodiment, the data transmission module comprises:
the A/D conversion unit is used for carrying out analog-to-digital conversion on the transmitted thermosensitive voltage signal;
and the isolation chip is used for carrying out signal isolation processing on the transmitted thermosensitive voltage signal.
In one embodiment, the power supply circuit includes a relay, and the control module includes:
the data processing unit is used for calculating a plurality of temperature data corresponding to each temperature acquisition circuit according to the received multi-path thermosensitive voltage signals, judging whether the temperature data which is more than or equal to a temperature protection limiting value exists in the plurality of temperature data, and if so, sending a protection control signal to control the action of a normally open contact of a power supply relay of a train storage battery box;
and the state prompting unit is used for prompting the current state of the train storage battery box according to the judgment result of the MCU control unit.
In one embodiment, the data processing unit is configured to:
calculating resistance data according to the thermosensitive voltage signal, and acquiring current temperature acquisition according to the obtained resistance dataTemperature data corresponding to the circuit; wherein the resistance data R is calculated as follows NTC ：
Figure BDA0002275028560000021
Wherein R is the resistance value of the first resistor, the second resistor, the third resistor or the fourth resistor in the temperature acquisition circuit, and V ADC Is a temperature-sensitive voltage signal, V VREF A source voltage value provided for a VREF voltage source.
In one embodiment, the data storage module is configured to:
and standardizing the temperature data and the protection control signal data according to a set standardization rule, and storing the standardized temperature data and the standardized protection control signal data into a set storage medium.
In one embodiment, the apparatus further comprises: and the data analysis module is used for reading the downloaded protection control signal data and the temperature data and carrying out waveform processing and analysis in a set time period.
In accordance with other aspects of the present invention, in an embodiment, there is also provided a multi-channel collection temperature limit protection method for a train battery box, the method including:
step S1, acquiring thermosensitive voltage signals of different positions of the train storage battery box in real time;
step S2, converting and isolating the collected multi-channel thermosensitive voltage signals for transmission;
step S3, calculating and determining a plurality of temperature data of different positions of the train storage battery box according to the multi-path thermosensitive voltage signals, and if any temperature data in the plurality of temperature data reaches a temperature protection limit value, sending a protection control signal to control a power supply circuit of the train storage battery to be disconnected;
and step S4, standardizing and storing the temperature data and the protection control signal data of the storage battery box.
Compared with the closest prior art, the invention also has the following beneficial effects:
the invention provides a multi-channel acquisition temperature limit protection device for a train storage battery box, which comprises: the device comprises a data acquisition module for acquiring multiple paths of thermosensitive voltage signals of the storage battery box in real time, a data transmission module for converting and isolating each path of thermosensitive voltage signals and transmitting, a power supply circuit for determining multiple temperature data according to the multiple paths of thermosensitive voltage signals, sending a protection control signal to control the storage battery according to each temperature data and a set temperature protection limit value, and a data storage module for carrying out standardized processing on the temperature data and the protection control signal data and storing the data. By adopting the technical scheme of the invention, the real-time temperature data of a plurality of positions of the storage battery box can be synchronously acquired, the power supply circuit of the storage battery is flexibly controlled based on the real-time temperature data of the plurality of positions, the continuous heating of the storage battery is timely and accurately interrupted, and the probability of fire hazard of the storage battery is greatly reduced. Meanwhile, in the data transmission process, not only is analog-to-digital conversion carried out on the transmitted signals, but also the transmitted signals are processed based on a signal isolation technology, so that a high-quality signal source is provided for calculation and data judgment of a control module of the device, and the protection accuracy of the device is further ensured. In addition, the data is standardized before being stored, the storage format of the data is supplemented, abnormal and invalid data are filtered, and the storage space is greatly saved on the basis of facilitating the checking of a user.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural flow chart of a multi-channel temperature limit protection device for a train storage battery box according to an embodiment of the invention;
FIG. 2 is a schematic connection diagram of a temperature acquisition circuit of the multi-path acquisition temperature limit protection device in the embodiment of the invention;
fig. 3 is a schematic flow chart of a multi-channel collection temperature limit protection method for a train storage battery box in another embodiment of the invention.
Detailed Description
The following detailed description will be provided for the embodiments of the present invention with reference to the accompanying drawings and examples, so that the practitioner of the present invention can fully understand how to apply the technical means to solve the technical problems, achieve the technical effects, and implement the present invention according to the implementation procedures. It should be noted that, unless otherwise conflicting, the embodiments and features of the embodiments of the present invention may be combined with each other, and the technical solutions formed are all within the scope of the present invention.
The storage battery is used as an important device of the auxiliary power supply system of the high-speed train, and when a main direct-current 110V power supply of the train fails, the storage battery is required to provide power for all or part of direct-current 110V loads, so that the safety and stability of a main control system of the train are guaranteed.
If the temperature of the storage battery box of the high-speed train is too high, the storage battery can be ignited, the normal power supply of the storage battery is influenced, the train running safety is seriously influenced, and therefore the temperature in the storage battery box needs to be monitored in real time.
Based on the above requirements, the present invention provides a multi-channel temperature limit protection device for a train battery box, which synchronously obtains implementation temperature data of different positions of the train battery box through a multi-channel temperature acquisition circuit, and monitors each temperature data in real time, as long as the temperature data of any position reaches a temperature protection limit value with high thermal risk, and takes corresponding protection measures, thereby reliably preventing any high thermal abnormality of the train battery box. Various embodiments of the present invention will be described below with reference to the accompanying drawings.
Fig. 1 shows a schematic structural diagram of a multi-channel temperature limit protection device for a train battery box according to an embodiment of the invention. As shown in fig. 1, the multi-channel collection temperature limit protection device 1 provided by the present invention comprises:
and the data acquisition module 110 is used for acquiring multi-path thermosensitive voltage signals of the train storage battery box in real time through a multi-path temperature acquisition circuit. The multi-path temperature acquisition circuit is used for acquiring temperature data of different set positions of the train storage battery box; wherein the set position is determined according to the distribution position of each storage battery in the storage battery box. In practical application, the setting position of each temperature acquisition circuit can be determined by the staff according to the distribution condition of each storage battery in the train storage battery box, for example, one temperature acquisition circuit can be set at the middle point of each surface of the storage battery box, or at least one temperature acquisition circuit can be set at the surface close to the storage battery.
And the data transmission module 130 is used for converting and transmitting each path of thermosensitive voltage signals acquired by the data acquisition module in an isolated manner.
And the control module 150 is used for determining a plurality of corresponding temperature data according to the received multipath thermosensitive voltage signals, and if any one of the plurality of temperature data reaches a temperature protection limit value, sending a protection control signal to control the power supply circuit of the train storage battery to be disconnected.
And the data storage module 170 is used for standardizing and storing the temperature data and the protection control signal data.
A data download module 190 for providing an interface for downloading temperature data and protection control signal data from the data storage module.
In a preferred embodiment, each temperature acquisition circuit in the temperature acquisition module 110 of the apparatus of the present invention employs a bridge circuit. Fig. 2 shows a connection schematic diagram of a temperature acquisition circuit in the multi-acquisition temperature limit protection device for the train storage battery box according to the embodiment of the invention. As can be seen from fig. 2, the temperature acquisition circuit of this embodiment includes: the VREF voltage source, the NTC thermistor, a first resistor connected between one end of the VREF voltage source and the NTC thermistor, a second resistor connected at the other end of the VREF voltage source, a third resistor connected between the NTC thermistor and the grounding end, and a fourth resistor connected between the second resistor and the grounding end. The VREF voltage source adopts a high-precision voltage reference chip, and each resistor (including a first resistor, a second resistor, a third resistor and a fourth resistor) adopts a high-precision resistor. Based on this, can guarantee fundamentally from the front-end circuit and gather the quality and the accuracy of signal source, provide reliable data source for control module carries out data processing afterwards.
The temperature acquisition circuit detects a first voltage V1 between one end of the VREF voltage source and the NTC thermistor and a second voltage V2 between the second resistor and the fourth resistor, and specifically, each temperature acquisition circuit is further configured to: and detecting a first voltage between one end of a VREF voltage source and the NTC thermistor and a second voltage between the second resistor and the fourth resistor, and taking the voltage difference between the first voltage V1 and the second voltage V2 as a thermosensitive voltage signal of the temperature acquisition circuit corresponding to the storage battery box. As shown in fig. 2, the voltage difference between V1 and V2 is obtained by an op amp.
Next, the acquired thermosensitive voltage signal is transmitted to a control module of the apparatus by a data transmission module, and in one embodiment, the data transmission module 130 includes: and the A/D conversion unit is used for carrying out analog-to-digital conversion on the transmitted thermosensitive voltage signal.
And the isolation chip is used for carrying out signal isolation processing on the transmitted thermosensitive voltage signal. In this embodiment, the a/D conversion unit and the isolation chip both obtain and transmit the thermosensitive voltage signal through the SPI bus, and preferably, the a/D conversion unit employs an a/D converter with a matching reference voltage, wherein the parameters of the reference voltage are set according to the configuration requirements of the a/D converter.
In one embodiment, the power supply circuit includes a relay, and the control module 150 includes:
and the data processing unit is used for calculating a plurality of temperature data corresponding to each temperature acquisition circuit according to the received multi-channel thermosensitive voltage signals, judging whether temperature data which are more than or equal to a temperature protection limit value exist in the plurality of temperature data, and if so, sending a protection control signal to control the normally open contact of a power supply relay of the train storage battery box to act.
And the state prompting unit is used for prompting the current state of the train storage battery box according to the judgment result of the MCU control unit. In a preferred example, the status prompting unit uses status indicator lamps, and the judgment results of the data processing unit in the control module are displayed by indicator lamps with different colors.
In a preferred embodiment, the control unit sends the protection control signal to the relay in the power supply circuit through the optical coupler, and the advantages of small size, long service life, no contact, strong anti-interference capability and the like provide reliable guarantee for the unidirectional transmission of the protection control signal.
Wherein the data processing unit is configured to: and calculating resistance data according to the thermosensitive voltage signal, and acquiring temperature data corresponding to the current temperature acquisition circuit according to the obtained resistance data. Specifically, it calculates the resistance data R according to the following formula NTC ：
Figure BDA0002275028560000061
Wherein R is the resistance value of the first resistor, the second resistor, the third resistor or the fourth resistor in the temperature acquisition circuit, and V ADC Is a thermosensitive voltage signal, V VREF A source voltage value provided for a VREF voltage source.
In one embodiment, the data processing unit adopts an MCU high performance processing chip, which performs calculation according to the acquired thermosensitive voltage signal, determines the resistance data corresponding to the temperature acquisition circuit, and acquires the temperature data corresponding to the current temperature acquisition circuit according to the obtained resistance data by a table lookup method.
In one embodiment, the control module is further provided with a power supply for supplying power to the various components in the control module, which optionally employs a DCDC power supply.
In one embodiment, the control module is further provided with a debugging interface for providing an interface for debugging one or more functional components in the control module for a user, and in practical application, a worker can flexibly configure parameters of each component in the control module through the debugging interface, so that the debugging time consumption of the device is saved to a certain extent, and the condition that a data processing result is invalid due to the configuration error of the initial parameters is suppressed.
In one embodiment, the control module further includes a watchdog unit, which optionally uses a hardware watchdog, and is configured to monitor an operating state of the data processing unit in the control module in real time, periodically check an internal condition of the MCU chip, and send a restart signal to the chip once an error occurs, where the watchdog command has a highest priority in the interrupt of the program. Therefore, the data processing unit can be prevented from being in a closed loop state caused by external electromagnetic field interference or wrong instructions, and the stable operation of the protection device is ensured to a certain extent.
In one embodiment, the data storage module 170 of the apparatus of the present invention is configured to: and standardizing the temperature data and the protection control signal data according to a set standardization rule, and storing the standardized temperature data and the standardized protection control signal data into a set storage medium. Wherein, the set standardization rule comprises: adding a synchronous time identifier of a control module to the acquired temperature data; adding a corresponding temperature acquisition circuit identifier or a corresponding position identifier for the acquired temperature data; deleting abnormal data and invalid data with the change amplitude exceeding a set threshold value in a set time period, wherein the set time of the situation is usually extremely short; and deleting the valueless data with too small change amplitude in the duration time. Specifically, in this embodiment, the temperature data and the protection control signal data after the normalization processing are saved in the NANDFLASH memory chip.
Combining with an actual application scene, if temperature data 1s is set to be recorded once, and 16 bits are used for storing one temperature data, then 1s 60 24 30 2Byte is approximately equal to 5MByte, since time information needs to be stored when the temperature data is recorded, and the time information consists of six bytes of year, month, hour, minute and second, the storage space occupied by one path of temperature data is as follows: 1s 60 24 30 6Byte 15MByte, two temperature data, three months of data volume: 3 × 2 × 5+15 Mbyte ≈ 120Mbyte, and 128MB of memory chips can meet the requirement. The storage module of the device is arranged to store the data after standardized processing, so that the space of a storage medium is saved to a considerable extent, the types of the stored data are unified, the data are stored by combining with additional identification data, and convenience is provided for the user to check and recycle the data.
In one embodiment, the data download module of the apparatus of the present invention provides an offline download interface and an online download interface, wherein the offline download interface adopts a USB interface, the user uses the USB interface to download configuration parameters during data download via an RS232 serial port, the online download interface adopts an ethernet interface, and the data can be downloaded to a personal terminal device of the user, such as a PC, a mobile phone or a tablet, via both the USB interface and the ethernet interface.
In one embodiment, the apparatus of the present invention further comprises: and the data analysis module is used for reading the downloaded protection control signal data and the temperature data and carrying out waveform processing and analysis in a set time period. For example, in practical application, the original data can be checked through a user PC, or the data in a set time period is processed and displayed in the form of a waveform diagram, and then the analysis is developed based on the processing result, and the abnormal positions and the abnormal frequency of each position are recorded, so that corresponding precautionary measures can be taken for the storage battery box and each storage battery. Based on the data analysis module of the embodiment, the data form of analysis developed by a user is expanded, and the user can acquire information beneficial to the use and maintenance of the storage battery according to the original data and the extension of the original data.
In the multi-channel acquisition temperature limit protection device for the train storage battery box, provided by the embodiment of the invention, each module or unit structure can independently operate or operate in a combined mode according to test requirements so as to realize corresponding technical effects.
Based on one or more embodiments, the invention further provides a multi-channel acquisition temperature limit protection method for the train storage battery box. Fig. 3 shows a flow chart of a multi-channel collection temperature limit protection method for a train storage battery box in the embodiment of the invention. As shown in fig. 3, the method includes:
and S310, acquiring thermosensitive voltage signals of different positions of the train storage battery box in real time.
And step S322, converting and isolating the collected multipath thermosensitive voltage signals for transmission.
And S330, calculating and determining a plurality of temperature data of different positions of the train storage battery box according to the plurality of temperature-sensitive voltage signals, and if any one of the plurality of temperature data reaches a temperature protection limit value, sending a protection control signal to control a power supply circuit of the train storage battery to be disconnected.
And step S340, carrying out standardized processing on the temperature data and the protection control signal data of the storage battery box and storing the temperature data and the protection control signal data.
In one embodiment, in step S310, the number and location of acquiring the temperature-sensitive voltage signals are optionally determined by the staff according to the number and distribution of the batteries in the battery box.
In one embodiment, analog-to-digital conversion processing and signal isolation processing are carried out on the collected multiple paths of thermosensitive voltage signals in the transmission process, and an A/D conversion chip and an isolation chip are respectively adopted in practical application.
In one embodiment, the process of calculating and determining a plurality of temperature data of different positions of the train storage battery box according to the plurality of temperature-sensitive voltage signals comprises the following operations:
calculating resistance data R corresponding to each thermosensitive voltage signal according to the following formula NTC ：
Figure BDA0002275028560000071
Wherein R is the resistance of the first, second, third or fourth resistor in the temperature acquisition circuit, and V ADC Is a thermosensitive voltage signal, V VREF And obtaining the temperature data corresponding to the current temperature acquisition circuit by a table look-up method according to the obtained resistance data by using the source voltage value provided for the VREF voltage source.
In one embodiment, in the process of standardizing and storing the temperature data and the protection control signal data of the storage battery box, the set standardization rules comprise: adding the synchronous time of a control module to the obtained temperature data; attaching a corresponding temperature acquisition circuit identifier or a corresponding position identifier to the acquired temperature data; deleting data with the change amplitude exceeding a set threshold value in a set time period, wherein the set time in the case is usually extremely short; and deleting the valueless data with too small change amplitude in the duration time. Specifically, in this embodiment, the temperature data and the protection control signal data after the normalization processing are saved in the NANDFLASH memory chip.
Combining with an actual application scene, if temperature data 1s is set to be recorded once, and 16 bits are used for storing one temperature data, then 1s 60 24 30 2Byte is approximately equal to 5MByte, since time information needs to be stored when the temperature data is recorded, and the time information consists of six bytes of year, month, hour, minute and second, the storage space occupied by one path of temperature data is as follows: 1s 60 24 30 6Byte 15MByte, two temperature data, three months of data volume: 3 × 2 (5+15) Mbyte ≈ 120Mbyte, and 128MB memory chips can be selected to meet the requirement.
It is to be understood that the disclosed embodiments of the invention are not limited to the particular structures, process steps, or materials disclosed herein, but rather, are extended to equivalents thereof as would be understood by those ordinarily skilled in the relevant arts. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting.
Reference in the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. Thus, appearances of the phrase "an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment.
Although the embodiments of the present invention have been described above, the description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (9)

1. A multi-channel acquisition temperature limit protection device for a train battery box, the device comprising:
the data acquisition module acquires a plurality of paths of thermosensitive voltage signals of the train storage battery box in real time through a plurality of paths of temperature acquisition circuits;
the data transmission module is used for converting and transmitting the acquired thermosensitive voltage signals in an isolated manner;
the control module is used for determining a plurality of corresponding temperature data according to the received multi-channel thermosensitive voltage signals, and if any temperature data in the plurality of temperature data reaches a temperature protection limit value, a protection control signal is sent out to control a power supply circuit of the train storage battery to be disconnected;
the data storage module is used for carrying out standardized processing on the temperature data and the protection control signal data and storing the temperature data and the protection control signal data;
a data download module for providing an interface for downloading the temperature data and protection control signal data from the data storage module; wherein the temperature data and the protection control signal data are standardized according to the following rules: adding a synchronous time identifier of a control module to the acquired temperature data; attaching a corresponding temperature acquisition circuit identifier or a corresponding position identifier to the acquired temperature data; deleting abnormal data and invalid data with the change amplitude exceeding a set threshold value in a set time period; deleting the non-value data with the change amplitude as small as the set condition in the continuous time period;
each way temperature acquisition circuit adopts bridge circuit, includes: the VREF voltage source, the NTC thermistor, a first resistor connected between one end of the VREF voltage source and the NTC thermistor, a second resistor connected at the other end of the VREF voltage source, a third resistor connected between the NTC thermistor and the grounding end, and a fourth resistor connected between the second resistor and the grounding end;
and detecting a first voltage between one end of a VREF voltage source and the NTC thermistor and a second voltage between the second resistor and the fourth resistor.
2. The apparatus of claim 1, wherein each of the temperature acquisition circuits is further configured to:
and detecting a first voltage between one end of a VREF voltage source and the NTC thermistor and a second voltage between the second resistor and the fourth resistor, and taking the voltage difference between the first voltage and the second voltage as a thermosensitive voltage signal of the temperature acquisition circuit corresponding to the storage battery box.
3. The device of claim 1 or 2, wherein the multi-path temperature acquisition circuit is configured to acquire temperature data of different set positions of the train battery box; wherein the set position is determined according to the distribution position of each storage battery in the storage battery box.
4. The apparatus of claim 1, wherein the data transmission module comprises:
the A/D conversion unit is used for carrying out analog-to-digital conversion on the transmitted thermosensitive voltage signal;
and the isolation chip is used for carrying out signal isolation processing on the transmitted thermosensitive voltage signal.
5. The apparatus of claim 1, wherein the power supply circuit comprises a relay, and the control module comprises:
the data processing unit is used for calculating a plurality of temperature data corresponding to each temperature acquisition circuit according to the received multi-channel thermosensitive voltage signals, judging whether temperature data which are more than or equal to a temperature protection limit value exist in the plurality of temperature data, and if so, sending a protection control signal to control the action of a normally open contact of a power supply relay of the train storage battery box;
and the state prompting unit is used for prompting the current state of the train storage battery box according to the judgment result of the MCU control unit.
6. The apparatus of claim 5, wherein the data processing unit is to:
calculating resistance data according to the thermosensitive voltage signal, and acquiring temperature data corresponding to the current temperature acquisition circuit according to the obtained resistance data; wherein the resistance data R is calculated as follows NTC ：
Figure FDA0003770584780000021
Wherein R is the resistance value of the first resistor, the second resistor, the third resistor or the fourth resistor in the temperature acquisition circuit, and V ADC Is a thermosensitive voltage signal, V VREF A source voltage value provided for a VREF voltage source.
7. The apparatus of claim 1, wherein the data storage module is to:
and standardizing the temperature data and the protection control signal data according to a set standardization rule, and storing the standardized temperature data and the standardized protection control signal data into a set storage medium.
8. The apparatus of claim 1, wherein the apparatus further comprises: and the data analysis module is used for reading the downloaded protection control signal data and the temperature data and carrying out waveform processing and analysis in a set time period.
9. A method for multi-sampling temperature limit protection using the device of any one of claims 1-8, the method comprising:
step S1, acquiring thermosensitive voltage signals of different positions of the train storage battery box in real time;
step S2, converting and isolating the collected multi-channel thermosensitive voltage signals for transmission;
step S3, a plurality of temperature data of different positions of the train storage battery box are calculated and determined according to the multi-path thermosensitive voltage signals, and if any one of the plurality of temperature data reaches a temperature protection limit value, a protection control signal is sent out to control a power supply circuit of the train storage battery to be disconnected;
and step S4, standardizing and storing the temperature data and the protection control signal data of the storage battery box.
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EP2806482B1 (en) * 2009-09-28 2017-06-28 Hitachi, Ltd. Battery system
CN104052028B (en) * 2013-03-13 2019-04-09 中兴通讯股份有限公司 A kind of wireless data communication terminal and its detection of battery excess temperature and protective device
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