CN204086381U - Train power supply monitoring subsystem leakage current test module - Google Patents
Train power supply monitoring subsystem leakage current test module Download PDFInfo
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- CN204086381U CN204086381U CN201420397656.7U CN201420397656U CN204086381U CN 204086381 U CN204086381 U CN 204086381U CN 201420397656 U CN201420397656 U CN 201420397656U CN 204086381 U CN204086381 U CN 204086381U
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Abstract
Train power supply monitoring subsystem leakage current test module, comprises power circuit, telecommunication circuit, cpu control circuit and circuitry for signal measurement; Power circuit is telecommunication circuit, cpu control circuit and circuitry for signal measurement provide required power supply, and cpu control circuit is by circuitry for signal measurement, telecommunication circuit and DC600V electric supply installation, host computer, 6A system communication.Train power supply monitoring subsystem leakage current test module completes DC600V electric supply installation leakage current numerical value and detects and send task, electric supply installation electric leakage information can be obtained in real time, Information Monitoring is uploaded, the 6A display interface of driver pulpit shows the security information such as electric supply installation earth leakage stream, thus can the state of anticipation electric supply installation, issuable fault is prevented in advance, reaches the object of train power supply safety.
Description
Technical field
The utility model relates to motorcycle safety detection field, is specifically related to train power supply monitoring subsystem leakage current test module.
Background technology
Locomotive vehicle-mounted security protection system and 6A system jeopardize safe material particular, Focusing on components and position in locomotive operation process, by on the basis of matured product that filled at part of earlier stage locomotive, consummating function, comprehensive integration and the motorcycle safety guard system of the systematization built, hardware and software platform.This system comprises centre platform and 6 subsystems, train power supply monitoring subsystem is one of them, complete the Insulation monitoring of locomotive power supply system and train using electricity system, power supply statistics and the running state information of DC600V electric supply installation, fault, Key state are monitored and record, thus can the state of anticipation electric supply installation, issuable fault is prevented in advance, reaches the object of train power supply safety.Train power supply monitoring subsystem leakage current test module belongs to train power supply monitoring subsystem, completes DC600V electric supply installation leakage current numerical value and detects and send task.Therefore, a kind of train power supply monitoring subsystem leakage current test module completing above-mentioned functions of invention is badly in need of.
Summary of the invention
The technical matters that the utility model solves is to provide a kind of train power supply monitoring subsystem leakage current test module, complete DC600V electric supply installation leakage current numerical value detect and send task, electric supply installation electric leakage information can be obtained in real time, issuable fault is prevented in advance, reaches the object of train power supply safety.
The technical solution adopted in the utility model is, train power supply monitoring subsystem leakage current test module, comprises power circuit, telecommunication circuit, cpu control circuit and circuitry for signal measurement; Power circuit is telecommunication circuit, cpu control circuit and circuitry for signal measurement provide required power supply, and cpu control circuit is by circuitry for signal measurement, telecommunication circuit and DC600V electric supply installation, host computer, 6A system communication.
Described power circuit comprises input filter EMI, DC-DC and isolates modular converter, and input filter EMI is for suppressing high frequency interference, and DC-DC isolates modular converter and is used for voltage transformation.
Described telecommunication circuit comprises first transceiver, second transceiver, and train power supply monitoring subsystem leakage current test module carries out data communication by first transceiver and electric supply installation, and second transceiver is used for reading and writing data and download.
Described circuitry for signal measurement comprises that filtering is followed, precision rectifying, isolation are amplified, differential amplifier; For analog to digital converter ADC provides required current signal.
Described cpu control circuit comprises ARM microprocessor chip, transceiver UART, analog to digital converter ADC and peripheral components; Transceiver UART is communicated with DC600V electric supply installation by first transceiver, and transceiver UART is communicated with host computer by second transceiver, and DC600V electric supply installation is communicated with analog to digital converter ADC by circuitry for signal measurement.
Described peripheral components comprises voltage monitoring, reset circuit, active crystal oscillator, JTAG, battery circuit, capacitor filtering and serial storage; Voltage monitoring is for monitoring cpu control circuit voltage; Jtag interface circuit is used for the download of program and data; Serial storage provides storage space for ARM microprocessor chip; Active crystal oscillator provides required crystal oscillator for ARM microprocessor chip; Reset circuit manually button-pressing way resets, built-in house dog.
Described first transceiver sets up buffer circuit.
The beneficial effects of the utility model are, train power supply monitoring subsystem leakage current test module completes DC600V electric supply installation leakage current numerical value and detects and send task, electric supply installation electric leakage information can be obtained in real time, Information Monitoring is uploaded, the 6A display interface of driver pulpit shows the security information such as electric supply installation earth leakage stream, thus can the state of anticipation electric supply installation, issuable fault is prevented in advance, reach the object of train power supply safety, the circuit design of train power supply monitoring subsystem leakage current test module has taken into full account anti-interference and data protection
Accompanying drawing explanation
Fig. 1 is the utility model theory diagram.
Fig. 2 is the utility model power circuit diagram.
Fig. 3 is the utility model train power supply monitoring subsystem leakage current test module principle figure.
Embodiment
Now by reference to the accompanying drawings 1,2,3, the utility model is further described:
Train power supply monitoring subsystem leakage current test module of the present utility model belongs to train power supply monitoring subsystem, its characteristic index and parameter as follows:
Nominal operation supply voltage: DC110V ± 5%
Nominal operation power: 10W
Measurement range: 0---300mA
Measuring accuracy: error < ± 7%
Current detecting input resistance: < 0.4 Ω
Communication mode: RS485, RS232
Environment temperature :-40 DEG C----+70 DEG C
(1) power circuit
As shown in Figure 2, the DC-DC that power circuit completes input power DC110V to isolation and amplifier 5V changes power circuit, the isolation and amplifier of 5V-5V, 5V-± 15V, the output of 5V-3.3V and the conversion of+15V-5V.Power circuit provides+5V ,+5V_ISO1,3.3V, and ± 15V exports with the power supply of+5V_ISO2 several types, to meet the power requirement of native system.
First train power supply monitoring subsystem leakage current test module needs to measure outside leakage current as requested, and measure portion power supply needs and inner loop isolated from power, measure portion needs ± 15V and+5V power supply; Meanwhile, the power supply that communications portion uses also needs to isolate with internal control power supply and metering circuit partial power, and telecommunication circuit needs+5V power supply; Control section comprises the+5V power supply that cpu chip power supply needs 3.3V and peripheral components needs.
The filtering of power circuit front end and EMI part complete the absorption of the filtering of input voltage, overvoltage protection and surge current; EMI part can remove common mode electromagnetic interference (EMI) effectively; then the voltage signal removing interference is sent into DC-DC input end, DC-DC module completes the voltage isolation conversion of 110-5V.The input voltage range of DC-DC module can reach 66V ~ 160V, good reliability, and temperature characterisitic is given prominence to, and aims at Iron-surfur clusters customization, can fully meet power requirement of the present utility model.
The DC5V of DC-DC module isolation conversion converts the 3.3V voltage producing maximum 3A to by chip, meet design needs completely; DC5V provides power supply for peripheral components, comprises reset circuit, electric source monitoring circuit, crystal oscillator and RS-232 telecommunication circuit etc.DC5V is the 5V_ISO1 of isolation by module converts, is supplied to RS-485 telecommunication circuit, for communication chip provides the power supply of isolating with control and measurement, thus reduces line-hit, ensures system worked well.DC5V is converted to ± 15V_ISO by module isolation, and this module isolation voltage is 3kV, output current ± 33mA, can meet the amplifier power requirement of metering circuit; Comparer simultaneously in metering circuit needs+5V voltage, directly by voltage reduction module ,+15V_ISO directly can be converted to+5V_ISO2, and these two groups of power supplys are jointly supplied to measuring circuit and use.
(2) system principle introduction
Train power supply monitoring subsystem leakage current test modular circuit principle as shown in Figure 3.Following CUP chip adopts arm chip.
1, cpu control circuit, cpu control circuit realizes the normal work of cpu chip, download program, information store and reset function, completes the control tasks such as communication, storage.Mainly comprise cpu chip, voltage monitoring, reset circuit, crystal oscillating circuit, JTAG mouth read/write circuit and RAM memory interface circuit etc.The CPU that core control processor adopts has 3 level production lines and Harvard structure, and operating frequency can reach 100MHz; Built-in nested vector interrupt controller NVIC; Flash program storage on the 512KB sheet with in-system programming ISP and in-service units IAP function.
The function that native system needs can be realized by the peripheral component of cpu chip:
1., 4 UART, mixed decimal baud rate generating function, inner FIFO, DMA support and RS-485, communicate in order to realize RS-485 with RS-232;
2., the approximant analog to digital converter ADC of 12 primary and secondarys of 8 passages, there is power-down mode, measurement range: 0 ~ Vrefp is generally 3V, be no more than VDDA; 12 switching times, 200KHz; Can select to trigger conversion by input saltus step or timer matched signal;
3., the I of 3 enhancement mode
2c bus interface, in order to realize the connection with FRAM;
The crystal oscillator of CPU is provided by the active crystal oscillator of 12M, and 12MHz inner RC oscillator IRC adjusts to the precision of 1%, and in sheet, PLL just can make CPU operate with highest frequency 100MHz without the need to high-frequency crystal oscillator; Complete the monitoring to chip 3.3V supply voltage by the IO pin of ARM microprocessor chip, reset chip manually button-pressing way resets, and adds house dog and arranges, ensure that the reliability of software; Jtag interface circuit completes the download of program and data; The design of storage unit adopts I
2the 1M position ferroelectric memory of C bus, can store 128K byte 8, this storer does not have write delay, and data retention period is limited to 10 years.
2, circuitry for signal measurement, circuitry for signal measurement completes the filtering to outside 0---300mA bidirectional current, shaping, and amplify, the tasks such as isolation, ADC port signal being input to CPU inside carries out AD conversion, calculates current leakage current numerical value.
The main task of train power supply monitoring subsystem leakage current test module is exactly detect the output earth leakage stream of DC600V electric supply installation, by communication interface, the leakage data detected is passed to when AP is locking the centre platform of 6A system, 6A in driver pulpit shows screen display, so the circuitry for signal measurement of train power supply monitoring subsystem leakage current test module needs high precision to gather leakage current signal accurately, and convert the signal into the DC level signal that CPU can carry out ADC conversion.
According to technical conditions requirement, leakage current module need gather the bidirectional, dc signal of 0---300mA, first the design passes through resistance sampling to input current signal, then the second order active low-pass filtering through being made up of amplifier, signal burr can be reduced on the one hand and reduce fluctuation, the input impedance of A/D can be improved on the other hand, and output impedance can be reduced to minimum, because the ADC module of CPU requires that when processing fast-changing simulating signal output impedance little as far as possible meets accuracy requirement.Filtered voltage signal by the clamping circuit of duodiode voltage is limited in ± 15V between, prevent high-voltage signal from damaging amplifier, because leakage current signal is two-way, so the signal collected just has generating positive and negative voltage two kinds of situations, the design adopts amplifier, resistance and precision rectifying diode to build all-wave precise rectification circuit, is the 0-250mV positive signal of the isolated amplifier needs of rear end by resistors match by positive/negative voltage signal rectification.High precision isolated amplifier exports and can reach 4250V between input circuit
pEAKelectric current isolation, electromagnetism interference performance is extremely strong; When with insulating power supply with the use of time, the noise on common mode voltage circuit can be prevented, electric current enters interference, infringement circuit.Isolated amplifier can realize the accurate voltage measurement in the design, and output signal is automatically adjusted to the maximum low side power common mode voltage being no more than 3.3V.Signal is finally modulated into the TTL signal that voltage range is 0---3.3V by the differential discharge circuit built by amplifier after common mode voltage exports, and enters into the input end of analog to digital converter ADC.The digital power that the power supply of the built-in ADC of CPU and reference voltage are used by inductance and CPU is isolated, by software merit rating ADC clock, register etc. after signal input, can the analog to digital conversion of settling signal, and reach the object of design.
3, telecommunication circuit, first transceiver adopts RS-485 transceiver, and second transceiver adopts RS-232 transceiver; Telecommunication circuit completes the communication of train power supply monitoring subsystem leakage current test module and electric supply installation, transmits leakage current numerical value, complete parameter modification, reading by RS-232 transceiver and host computer by the RS-485 transceiver of isolation.
The communication task of train power supply monitoring subsystem leakage current test module mainly completes information transmission between electric supply installation and host computer to the read-write of module, carry out exchanges data by the RS-485 transceiver of isolation and electric supply installation, complete download to train power supply monitoring subsystem leakage current test module data and read-write by RS-232 transceiver.
Train power supply monitoring subsystem leakage current test module is carried out RS-485 by the UART communication interface that CPU is built-in with electric supply installation and is communicated, the baud rate of the RS-485 of the isolation transmitting-receiving of communication interface is 19200, in order to ensure the quality of Signal transmissions, the high speed photo coupling message transmission rate that isolating chip need be selected is 1Mbit/s, and insulation voltage is up to 2.5kV, meet the baud rate needs of the design completely; Line transceiver chip uses multiple spot long thread transfer bus chip, and aim at and work under interference environment and design having, common-mode input voltage range is ± 12V, and ternary output meets RS-485 differential signal interface requirement.Consider debugging and the needs that communicate that in the future may increase, this modular design 2 identical RS-485 telecommunication circuits in road.
Train power supply monitoring subsystem leakage current test module realizes RS-232 transceiver communications function by the UART communication interface that CPU is built-in, RS-232 transceiver uses transceiver to complete the read-write of download to AP card data and cpu chip, the proprietary low voltage difference transmitter output stage of transponder chip is guaranteed under 120kbps data rate, maintain RS-232 transceiver output level, there are No. 2 receivers and 2 road drivers, provide 1 μ A shutdown mode effectively to reduce power consumption; Under shutdown mode, receiver is remained valid state, monitors, only consume 1 μ a-power supply electric current to external unit.
Claims (7)
1. train power supply monitoring subsystem leakage current test module, is characterized in that: comprise power circuit, telecommunication circuit, cpu control circuit and circuitry for signal measurement; Power circuit is telecommunication circuit, cpu control circuit and circuitry for signal measurement provide required power supply, and cpu control circuit is by circuitry for signal measurement, telecommunication circuit and DC600V electric supply installation, host computer, 6A system communication.
2. train power supply monitoring subsystem leakage current test module according to claim 1, it is characterized in that: described power circuit comprises input filter EMI, DC-DC and isolates modular converter, input filter EMI is for suppressing high frequency interference, and DC-DC isolates modular converter and is used for voltage transformation.
3. train power supply monitoring subsystem leakage current test module according to claim 1, it is characterized in that: described telecommunication circuit comprises first transceiver, second transceiver, train power supply monitoring subsystem leakage current test module carries out data communication by first transceiver and electric supply installation, and second transceiver is used for reading and writing data and download.
4. train power supply monitoring subsystem leakage current test module according to claim 1, is characterized in that: described circuitry for signal measurement comprises that filtering is followed, precision rectifying, isolation are amplified, differential amplifier; For analog to digital converter ADC provides required current signal.
5. train power supply monitoring subsystem leakage current test module according to claim 1, is characterized in that: described cpu control circuit comprises ARM microprocessor chip, transceiver UART, analog to digital converter ADC and peripheral components; Transceiver UART is communicated with DC600V electric supply installation by first transceiver, and transceiver UART is communicated with host computer by second transceiver, and DC600V electric supply installation is communicated with analog to digital converter ADC by circuitry for signal measurement.
6. train power supply monitoring subsystem leakage current test module according to claim 5, is characterized in that: described peripheral components comprises voltage monitoring, reset circuit, active crystal oscillator, JTAG, battery circuit, capacitor filtering and serial storage; Voltage monitoring is for monitoring cpu control circuit voltage; Jtag interface circuit is used for the download of program and data; Serial storage provides storage space for ARM microprocessor chip; Active crystal oscillator provides required crystal oscillator for ARM microprocessor chip; Reset circuit manually button-pressing way resets, built-in house dog.
7. train power supply monitoring subsystem leakage current test module according to claim 3, is characterized in that: described first transceiver sets up buffer circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420397656.7U CN204086381U (en) | 2014-07-18 | 2014-07-18 | Train power supply monitoring subsystem leakage current test module |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420397656.7U CN204086381U (en) | 2014-07-18 | 2014-07-18 | Train power supply monitoring subsystem leakage current test module |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104090154A (en) * | 2014-07-18 | 2014-10-08 | 中国北车集团大连机车研究所有限公司 | Leak current detection module for train power supply monitoring subsystem |
| CN104614629A (en) * | 2015-01-19 | 2015-05-13 | 国家电网公司 | Grounding detection discrimination circuit |
| CN104880640A (en) * | 2015-06-01 | 2015-09-02 | 镇江大全赛雪龙牵引电气有限公司 | DC traction power supply system frame electric leakage monitoring apparatus |
-
2014
- 2014-07-18 CN CN201420397656.7U patent/CN204086381U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104090154A (en) * | 2014-07-18 | 2014-10-08 | 中国北车集团大连机车研究所有限公司 | Leak current detection module for train power supply monitoring subsystem |
| CN104614629A (en) * | 2015-01-19 | 2015-05-13 | 国家电网公司 | Grounding detection discrimination circuit |
| CN104880640A (en) * | 2015-06-01 | 2015-09-02 | 镇江大全赛雪龙牵引电气有限公司 | DC traction power supply system frame electric leakage monitoring apparatus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 116021 Shahekou, Liaoning, China No. 49 The Strip Patentee after: CRRC DALIAN INSTITUTE CO., LTD. Address before: 116021 Shahekou, Liaoning, China No. 49 The Strip Patentee before: CNR Dalian Locomotive Research Institute Co., Ltd. |
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| CP01 | Change in the name or title of a patent holder |