CN104090154A - Leak current detection module for train power supply monitoring subsystem - Google Patents
Leak current detection module for train power supply monitoring subsystem Download PDFInfo
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- CN104090154A CN104090154A CN201410344409.5A CN201410344409A CN104090154A CN 104090154 A CN104090154 A CN 104090154A CN 201410344409 A CN201410344409 A CN 201410344409A CN 104090154 A CN104090154 A CN 104090154A
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Abstract
A leak current detection module for a train power supply monitoring subsystem comprises a power circuit, a communication circuit, a CPU control circuit and a signal measurement circuit. The power circuit provides a required power supply for the communication circuit, the CPU control circuit and the signal measurement circuit. The CPU control circuit is in communication with a DC600V power supply device, an upper computer and a 6A system through the signal measurement circuit and the communication circuit. By means of the leak current detection module for the train power supply monitoring subsystem, the leak current numerical value of the DC600V power supply device can be detected, a task can be sent, and therefore electric leakage information of the power supply device can be obtained in real time; the collected information is uploaded, safety information such as grounding leakage current of the power supply device is displayed on a 6A display interface of a driver control cabinet, and therefore the state of the power supply device can be judged in advance, the faults which can be possibly generated can be prevented in advance, and the aim of safely supplying power to a train is achieved.
Description
Technical field
The present invention relates to motorcycle safety detection field, be specifically related to train power supply monitoring subsystem leakage current test module.
Background technology
Locomotive vehicle-mounted security protection system is that 6A system is for jeopardizing safe material particular, Focusing on components and position in locomotive operation process, by having filled at part of earlier stage locomotive on the basis of matured product of use, consummating function, comprehensive integration and the systematization building, the motorcycle safety guard system of hardware and software platform.This system comprises central processing platform and 6 subsystems, train power supply monitoring subsystem is one of them, the insulation that completes locomotive power supply system and train using electricity system detects, powers and add up and the running state information of DC600V electric supply installation, fault, Key state are monitored and record, thereby state that can anticipation electric supply installation, issuable fault is prevented in advance, reach 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, be badly in need of a kind of train power supply monitoring subsystem leakage current test module that completes above-mentioned functions of invention.
Summary of the invention
Technical matters solved by the invention is to provide a kind of train power supply monitoring subsystem leakage current test module, complete DC600V electric supply installation leakage current numerical value and detect and send task, can obtain in real time electric supply installation electric leakage information, issuable fault is prevented in advance, reach the object of train power supply safety.
The technical solution used in the present invention is that train power supply monitoring subsystem leakage current test module, comprises power circuit, telecommunication circuit, cpu control circuit and circuitry for signal measurement; Power circuit provides required power supply for telecommunication circuit, cpu control circuit and circuitry for signal measurement, 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 isolation modular converter, and input filter EMI is used for suppressing high frequency interference, and DC-DC isolation modular converter is for voltage transformation.
Described telecommunication circuit comprises first transceiver, second transceiver, and train power supply monitoring subsystem leakage current test module is carried out data communication by first transceiver and electric supply installation, and second transceiver is for reading and writing data and download.
Described circuitry for signal measurement comprises that filtering is followed, precision rectifying, isolation amplify, 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 communicates by letter with DC600V electric supply installation by first transceiver, and transceiver UART communicates by letter with host computer by second transceiver, and DC600V electric supply installation is communicated by letter 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 used for monitoring cpu control circuit voltage; Jtag interface circuit is 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 resets by hand push button mode, built-in house dog.
Described first transceiver is set up buffer circuit.
The invention has the beneficial effects as follows, train power supply monitoring subsystem leakage current test module completes DC600V electric supply installation leakage current numerical value and detects and send task, can obtain in real time electric supply installation electric leakage information, Information Monitoring is uploaded, on the 6A of driver pulpit display interface, show the security information such as electric supply installation earth leakage stream, thereby state that can 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 principle of the invention block diagram.
Fig. 2 is power circuit diagram of the present invention.
Fig. 3 is train power supply monitoring subsystem leakage current test module principle figure of the present invention.
Embodiment
Now by reference to the accompanying drawings 1,2,3, the present invention is further illustrated:
Train power supply monitoring subsystem leakage current test module of the present invention belongs to train power supply monitoring subsystem, and its characteristic index and parameter are as follows:
(1) power circuit
As shown in Figure 2, power circuit completes input power DC110V to the DC-DC conversion of isolation output 5V to power circuit, the isolation output of 5V-5V, 5V-± 15V, the output of 5V-3.3V and+conversion of 15V-5V.Provide+5V of power circuit ,+5V_ISO1,3.3V, ± 15V and+output of 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 outside leakage current to measure as requested, measure portion power supply need to internal control part isolated from power, measure portion needs ± 15V and+5V power supply; Meanwhile, the power supply that communications portion is used also needs and internal control power supply and metering circuit part isolated from power, telecommunication circuit needs+5V power supply; Control section comprise cpu chip power supply need 3.3V and peripheral components needs+5V power supply.
The filtering of power circuit front end and EMI partly complete the absorption of filtering, overvoltage protection and the surge current of input voltage; EMI part can be removed common mode electromagnetic interference (EMI) effectively; then send removing the voltage signal disturbing 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 outstanding, aims at railway product customization, can fully meet power requirement of the present invention.
The DC5V of DC-DC module isolation conversion converts the 3.3V voltage that produces maximum 3A to by chip, meet design needs completely; DC5V, for peripheral components provides power supply, 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, offers RS-485 telecommunication circuit, for communication chip provides the power supply of isolating with control and measurement, thereby reduces line-hit, and assurance system is normally worked.DC5V isolates be converted to ± 15V_ISO by module, this module isolation voltage is 3kV, and output current ± 33mA can meet the amplifier power requirement of metering circuit; Comparer needs+5V the voltage in metering circuit simultaneously, can be directly by incite somebody to action+be directly converted to+5V_ISO2 of 15V_ISO of voltage reduction module, these two groups of power supplys offer measuring circuit use jointly.
(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 is realized normal work, program download, information storage and the reset function of cpu chip, 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 vectorial interruptable controller NVIC; There is in-system programming ISP and Flash program storage on the 512KB sheet of application programming IAP function.
The function that native system needs can realize by the peripheral component of cpu chip:
1., 4 UART, mixed decimal baud rate generating function, inner FIFO, DMA support and RS-485, in order to realize RS-485, communicate by letter 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 and being connected of FRAM;
The crystal oscillator of CPU is provided by the active crystal oscillator of 12M, and the inner RC oscillator of 12MHz IRC adjusts to 1% precision, and in sheet, PLL just can make CPU operate with highest frequency 100MHz without high-frequency crystal oscillator; IO pin by ARM microprocessor chip completes the monitoring to chip 3.3V supply voltage, and reset chip resets by hand push button mode, has increased house dog setting, has guaranteed 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 8 of 128K bytes, and 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, and shaping is amplified, the tasks such as isolation, the ADC port that signal is 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 that the output earth leakage stream of DC600V electric supply installation is detected, by communication interface, the leakage data detecting is passed to the central processing platform of 6A system when the AP engaging, 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 accurately leakage current signal, and converts signal to 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 filter that process is comprised of amplifier, can reduce on the one hand signal burr and reduce fluctuation, can improve the input impedance of A/D on the other hand, and output impedance can be reduced to minimum, because the ADC module of CPU requires as far as possible little output impedance to meet accuracy requirement when processing fast-changing simulating signal.The clamping circuit of filtered voltage signal by duodiode by limiting voltage between ± 15V, prevent that high-voltage signal from damaging amplifier, because leakage current signal is two-way, so the signal collecting just has two kinds of situations of generating positive and negative voltage, the design adopts amplifier, resistance and precision rectifying diode to build all-wave precise rectification circuit, the 0-250mV positive signal that the isolated amplifier that is rear end by positive/negative voltage signal rectification by resistors match needs.Between the output of high precision isolated amplifier and input circuit, can reach 4250V
pEAKelectric current isolation, anti-electromagnetic interference performance is extremely strong; When being used in conjunction with insulating power supply, can prevent that noise, the electric current on common mode voltage circuit from entering interference, infringement circuit.Isolated amplifier can be realized the accurate voltage measurement in the design, and output signal is automatically adjusted the downside power supply common mode voltage that is no more than 3.3V to maximum.The differential discharge circuit of building by amplifier after common mode voltage output is finally modulated into by signal the TTL signal that voltage range is 0---3.3V, 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, and after signal input, by software, configures ADC clock, register etc., and analog to digital conversion that can settling signal reaches the object of design.
3, telecommunication circuit, first transceiver adopts RS-485 transceiver, and second transceiver adopts RS-232 transceiver; Telecommunication circuit completes communicating by letter of train power supply monitoring subsystem leakage current test module and electric supply installation, and the RS-485 transceiver by isolation transmits leakage current numerical value, by RS-232 transceiver and host computer, is completed parameter modification, is read.
The communication task of train power supply monitoring subsystem leakage current test module mainly complete and electric supply installation between information transmission and the read-write of host computer to module, RS-485 transceiver and electric supply installation by isolation carry out exchanges data, by RS-232 transceiver, complete download and the read-write to train power supply monitoring subsystem leakage current test module data.
Train power supply monitoring subsystem leakage current test module is carried out RS-485 by the built-in UART communication interface of CPU with electric supply installation and is communicated by letter, the baud rate of the RS-485 of the isolation transmitting-receiving of communication interface is 19200, in order to guarantee the quality of signal transmission, 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, meets the design's baud rate needs completely; Circuit transponder chip is used the long thread transfer bus of multiple spot chip, aims at and under interference environment, works and design having, and common-mode input voltage range is ± 12V that ternary output meets RS-485 differential signal interface requirement.Consider debugging and the needs of communicating by letter that in the future may increase, this modular design the 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 built-in UART communication interface of CPU, RS-232 transceiver is used transceiver to complete the download of AP card data and the read-write of cpu chip, the proprietary low voltage difference transmitter output stage of transponder chip guarantees to maintain RS-232 transceiver output level under 120kbps data rate, there are No. 2 receivers and 2 road drivers, provide 1 μ A shutdown mode effectively to reduce power consumption; Under shutdown mode, the receiver state of remaining valid, monitors external unit, only consumes 1 μ a-power supply electric current.
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 provides required power supply for telecommunication circuit, cpu control circuit and circuitry for signal measurement, 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 isolation modular converter, input filter EMI is used for suppressing high frequency interference, and DC-DC isolation modular converter is 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 is carried out data communication by first transceiver and electric supply installation, and second transceiver is 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 amplify, 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 communicates by letter with DC600V electric supply installation by first transceiver, and transceiver UART communicates by letter with host computer by second transceiver, and DC600V electric supply installation is communicated by letter 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 used for monitoring cpu control circuit voltage; Jtag interface circuit is 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 resets by hand push button mode, 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 is set up buffer circuit.
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| CN201410344409.5A CN104090154A (en) | 2014-07-18 | 2014-07-18 | Leak current detection module for train power supply monitoring subsystem |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105162022A (en) * | 2015-09-06 | 2015-12-16 | 江西江控电气有限公司 | Novel safety power equipment drawer cabinet |
| CN107249010A (en) * | 2016-09-14 | 2017-10-13 | 深圳位置网科技有限公司 | A kind of unlawful assembly analysis system and analysis method |
| CN107797065A (en) * | 2017-10-19 | 2018-03-13 | 佘德勇 | Frequency conversion fan low speed operation troubles detects warning circuit |
| CN109239511A (en) * | 2017-07-10 | 2019-01-18 | 比亚迪股份有限公司 | Train, power supply system of train and its detection of electrical leakage positioning device, method |
| CN109228964A (en) * | 2017-07-10 | 2019-01-18 | 比亚迪股份有限公司 | Train, power supply system of train and its detection of electrical leakage recovery device, method |
| CN109228870A (en) * | 2017-07-10 | 2019-01-18 | 比亚迪股份有限公司 | Train and power supply system of train and its detection of electrical leakage recovery device, method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109228964A (en) * | 2017-07-10 | 2019-01-18 | 比亚迪股份有限公司 | Train, power supply system of train and its detection of electrical leakage recovery device, method |
| CN109228870A (en) * | 2017-07-10 | 2019-01-18 | 比亚迪股份有限公司 | Train and power supply system of train and its detection of electrical leakage recovery device, method |
| CN109228964B (en) * | 2017-07-10 | 2020-07-10 | 比亚迪股份有限公司 | Train, train power supply system and electric leakage detection and recovery device and method thereof |
| CN107797065A (en) * | 2017-10-19 | 2018-03-13 | 佘德勇 | Frequency conversion fan low speed operation troubles detects warning circuit |
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Application publication date: 20141008 |