CN105866461A - Speed test device for integrated sensor of CRH (China railway high-speed) 5 - Google Patents
Speed test device for integrated sensor of CRH (China railway high-speed) 5 Download PDFInfo
- Publication number
- CN105866461A CN105866461A CN201610345745.0A CN201610345745A CN105866461A CN 105866461 A CN105866461 A CN 105866461A CN 201610345745 A CN201610345745 A CN 201610345745A CN 105866461 A CN105866461 A CN 105866461A
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- China
- Prior art keywords
- velocity pick
- parallel
- electric capacity
- sensing element
- temperature
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The invention relates to speed test device for an integrated sensor of CRH (China railway high-speed) 5. The speed test device comprises a sensor and an EMC protection device, wherein the sensor integrates a speed sensing unit and a temperature sensing unit and is connected with the EMC protection device; a speed sensing element SS1, a speed sensing element SS12, a temperature sensing element TS1 and a temperature sensing element TS12 are arranged in the EMC protection device; the speed sensing element SS1 and the speed sensing element SS12 are connected with the speed sensing unit in the sensor, and the temperature sensing element TS1 and the temperature sensing element TS12 are connected with the temperature sensing unit in the sensor; high-frequency decoupling capacitors are further arranged in the EMC protection device; each of the speed sensing element SS1 and the speed sensing element SS12 is provided with an RC low-pass filtering circuit, a power supply primary protection circuit and a power supply secondary protection circuit. The speed test device has the advantages of stable output signals, high anti-electromagnetic-interference capacity and more reliable work.
Description
Technical field
The invention belongs to sensor technical field, particularly relate to a kind of CRH5 EMUs integrated sensor speed testing device.
Background technology
The CRH5 EMUs vehicle axle head integrated sensor velocity pick-up Technology design of the most online operation all uses NXP company
KMI 15 series of sensor chip, this chip operation principle is magnetoresistance, uses electric bridge to obtain magnetic field variation signal, through signal
Amplification, temperature-compensating, be then passed through Schmidt trigger, exports digital current signal.
The design of this sensing technology has the following disadvantages, and reduces the stability of product work.
1) signal processing IC and sensing element are not on same substrate, have a segment signal transmission range, and signal is easily by the external world
Electromagnetic interference, EMC poor-performing.
2) the built-in fritter ferrite magnet of sensor is as back of the body magnetic, even if chip has temperature-compensation circuit, but cannot be to the back of the body
Magnetic changes because of variations in temperature to be affected this factor of output signal and compensates.
Summary of the invention
It is an object of the invention to the deficiency overcoming prior art to exist, and a kind of stable output signal, electromagnetism interference energy are provided
The CRH5 EMUs integrated sensor speed testing device that power is strong, work more reliable.
It is an object of the invention to complete by following technical solution, including sensor, EMC preventer, described sensing
Device is by velocity pick-up unit and temperature sensing unit in one, and this sensor is connected with EMC preventer；Described EMC protection dress
Velocity pick-up element SS1, velocity pick-up element SS12, temperature-sensing element (device) TS1, temperature-sensing element (device) TS12 it is provided with in putting；
This velocity pick-up element SS1, velocity pick-up element SS12 are connected with the velocity pick-up unit in sensor, this temperature sensitivity unit
Part TS1, temperature-sensing element (device) TS12 are connected with the temperature sensing unit in sensor；Also set in described EMC preventer
Having high frequency decoupling capacitor, wherein velocity pick-up element SS1, velocity pick-up element SS12 are provided with RC low-pass filter circuit, power supply
First order protection circuit and power supply second level protection circuit.
As preferably, described high frequency decoupling capacitor is electric capacity C1, electric capacity C12, electric capacity C2, electric capacity C22, and this electric capacity C1 is also
Being coupled on velocity pick-up element SS1, electric capacity C12 is parallel on velocity pick-up element SS12, and it is sensitive that electric capacity C2 is parallel to temperature
On element TS1, electric capacity C22 is parallel on temperature-sensing element (device) TS12.
As preferably, described RC low-pass filter circuit is in parallel by resistance R1 and resistance R2, resistance R12 and resistance R22 is in parallel
Two-way circuit is constituted, wherein resistance R1 and the resistance R2 RC low-pass filtering with electric capacity C1 composition velocity pick-up element SS1 in parallel
Circuit, resistance R12 and the resistance R22 RC low-pass filter circuit with electric capacity C12 composition velocity pick-up element SS12 in parallel.
As preferably, in described power supply first order protection circuit, it is provided with varistor RV1 and varistor RV2, varistor
RV1 is in parallel with velocity pick-up element SS1, and varistor RV2 is in parallel with velocity pick-up element SS12.
As preferably, in described power supply second level protection circuit, it is provided with Transient Voltage Suppressor V1 and Transient Voltage Suppressor V12,
Transient Voltage Suppressor V1 is in parallel with velocity pick-up element SS1, and Transient Voltage Suppressor V12 and velocity pick-up element SS12 is also
Connection.
The invention have the benefit that 1), signal processing IC and sensing element be on same substrate, signal transmission distance is short,
Have employed the signal processing technologies such as calculus of differences, automatic growth control (AGC), the most deviation adjustment (AOA), output letter simultaneously
Number stable, anti-electromagnetic interference capability is strong；2), sensor without work the back of the body magnetic, work more reliable.
Accompanying drawing explanation
Fig. 1 is the circuit function block diagram of the present invention.
Fig. 2 is the circuit theory diagrams of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention doing detailed introduction: as shown in accompanying drawing 1,2, the present invention includes that sensor, EMC are anti-
Protection unit, described sensor is by velocity pick-up unit and temperature sensing unit in one, and velocity pick-up unit is to imitate based on magnetic resistance
Should or the operation principle of Hall effect, temperature sensing unit is the working mechanism utilizing thermal resistance, for rolling stock brakes,
Monitoring system uniform velocity or thermograph system provide reliable and stable signal.This sensor is connected with EMC preventer, makes sensing
Device can be competent at severe electromagnetic environment.Be provided with in described EMC preventer velocity pick-up element SS1, velocity pick-up element SS12,
Temperature-sensing element (device) TS1, temperature-sensing element (device) TS12；This velocity pick-up element SS1, velocity pick-up element SS12 and sensor
In velocity pick-up unit be connected, the temperature sensing in this temperature-sensing element (device) TS1, temperature-sensing element (device) TS12 and sensor
Unit is connected；Being additionally provided with high frequency decoupling capacitor in described EMC preventer, wherein velocity pick-up element SS1, speed pass
Sensing unit SS12 is provided with RC low-pass filter circuit, power supply first order protection circuit and power supply second level protection circuit.
Described high frequency decoupling capacitor is electric capacity C1, electric capacity C12, electric capacity C2, electric capacity C22, and this electric capacity C1 is parallel to speed and passes
On sensing unit SS1, electric capacity C12 is parallel on velocity pick-up element SS12, and electric capacity C2 is parallel on temperature-sensing element (device) TS1,
Electric capacity C22 is parallel on temperature-sensing element (device) TS12.
Described RC low-pass filter circuit is by resistance R1 and resistance R2 parallel connection, resistance R12 and resistance R22 parallel connection two-way circuit structure
Become, wherein resistance R1 and the resistance R2 RC low-pass filter circuit with electric capacity C1 composition velocity pick-up element SS1 in parallel, resistance
R12 and the resistance R22 RC low-pass filter circuit with electric capacity C12 composition velocity pick-up element SS12 in parallel；Velocity pick-up unit
Power end have employed RC low-pass filter circuit, eliminated power supply high-frequency interferencing signal, improved velocity pick-up element further
Working power quality.
It is provided with varistor RV1 and varistor RV2, varistor RV1 and speed in described power supply first order protection circuit
Sensing element SS1 is in parallel, and varistor RV2 is in parallel with velocity pick-up element SS12；Its power end have employed antisurge interference and sets
Meter, protects as the power supply first order, and absorption level is higher but interference signal that frequency is relatively low.
It is provided with Transient Voltage Suppressor V1 and Transient Voltage Suppressor V12, transient voltage in described power supply second level protection circuit
Suppressor V1 is in parallel with velocity pick-up element SS1, and Transient Voltage Suppressor V12 is in parallel with velocity pick-up element SS12；Its electricity
Source have employed anti-electrical fast transient (eft) disturbance-proof design, protects as the power supply second level, and absorption energy is relatively low but frequency is higher
Interference signal.
The scope of testing the speed of the present invention is:
CRH5 (A) EMUs the highest operation speed per hour is 250km/h, steering framing wheel footpath (mm): 890/810mm.
In order to ensure to have when sensor is applied suitable margin of safety, train speed per hour being improved 2 times, steering framing wheel footpath is with steamboat
Footpath 810mm calculates, and the wheel speed of detection is up to: n=500*1000000/ (π * 810*60) ≈ 3275 (r/min).
Owing to wheel each rotation produces 80 pulse signals, therefore when train runs with 500km/h, the work frequency of sensor
Rate is: f=3275*80/60 ≈ 4367 (Hz).
Annular magnet Velocity Measurement Integrated operating rate is 0Hz～8kHz, and analogue signal bandwidth is not less than 20kHz, therefore full
Test the speed area requirement enough.
The indices of velocity pick-up unit requires as follows:
Working power voltage
Nominal voltage: 14Vdc.It is operable with 12Vdc～16Vdc
Annular magnet Velocity Measurement Integrated, maximum working voltage is 28Vdc, meets working power voltage requirement.
Output waveform
Annular magnet Velocity Measurement Integrated current output type pulse signal, therefore meets requirement.
Output pulse amplitude
Current signal: 7mA ± 10% (low level), 14mA ± 10% (high-order).
Annular magnet Velocity Measurement Integrated has wide output voltage swing, and output LOW current is 7mA, and output HIGH current is 14mA,
Meet current signal amplitude requirement.
The indices of EMC preventer requires as follows:
(1) power end takes varistor as Anti-surging first class of protection.
According to standard GB/T 24338.4, line-line surge is 1kV, and line-line impedence is 2 Ω, owing to can extrapolate surge
Current peak is 500A, is 16Vdc in conjunction with sensor maximum working voltage, and when selecting varistor, pressure sensitive voltage should be greater than
1.6*16=25.6V, maximum surge current value should be greater than 500A.
The varistor that product design is selected, pressure sensitive voltage is 47V, and maximum surge current value is 1200A, meets requirement.
(2) power end takes TVS pipe to make anti-electrical fast transient (eft) second class protection.
TVS pipe V1 is mainly for the protection of follow-up sensing element, sensing element maximum working voltage is 28V, therefore TVS pipe
Specified reverse shutoff voltage VWMShould be greater than or equal to 28V.
The TVS pipe that product design is selected, specified reverse shutoff voltage VWMFor 30V, meet requirement.
(3) power end takes RC filtering measures.
RC filter design empirical value: resistance takes 50 Ω～100 Ω, and electric capacity takes 0.01uF～0.1uF.
The indices of temperature sensing unit requires as follows:
Temperature-sensing element
Element temperature-measuring range :-40 DEG C～+200 DEG C.
Chip temperature is Pt1000 element, and temperature-measuring range is-70 DEG C～+500 DEG C, therefore meets requirement.
Operating current
≤0.3mA。
Chip temperature operating current 0.1mA～mA, therefore meets requirement.
Nominal resistance
At 0 DEG C, the nominal resistance of zero energy is 1000 Ω.
Chip temperature is Pt1000 element, and at 0 DEG C, the nominal resistance of zero energy is 1000 Ω, therefore meets requirement.
Franchise
± 0.5%R (t) Ω.
The franchise grade of chip temperature is A level (EN60751), and franchise is ± (0.15+0.002 | t |) DEG C, meets requirement.
Thermal response time
In the water of 0.4m/s during test, τ0.5≤ 4.5s, τ0.9≤10s。
When the chip temperature of HERAEUS company is tested in the water of 0.4m/s, τ0.5≤ 0.05s, τ0.9≤ 0.15s, meets and wants
Ask.
It is understood that it will be understood by those skilled in the art that to technical scheme and inventive concept equivalent in addition
Or change the protection domain that all should belong to appended claims of the invention.
Claims (5)
1. a CRH5 EMUs integrated sensor speed testing device, it is characterised in that: include that sensor, EMC protect
Device, described sensor is by velocity pick-up unit and temperature sensing unit in one, and this sensor is connected with EMC preventer；
Velocity pick-up element SS1, velocity pick-up element SS12, temperature-sensing element (device) TS1, temperature it is provided with in described EMC preventer
Degree sensing element TS12；This velocity pick-up element SS1, velocity pick-up element SS12 are connected with the velocity pick-up unit in sensor
Connecing, this temperature-sensing element (device) TS1, temperature-sensing element (device) TS12 are connected with the temperature sensing unit in sensor；Described EMC
Being additionally provided with high frequency decoupling capacitor in preventer, wherein velocity pick-up element SS1, velocity pick-up element SS12 are provided with RC low pass
Filter circuit, power supply first order protection circuit and power supply second level protection circuit.
CRH5 EMUs integrated sensor speed testing device the most according to claim 1, it is characterised in that: described
High frequency decoupling capacitor be electric capacity C1, electric capacity C12, electric capacity C2, electric capacity C22, this electric capacity C1 is parallel to velocity pick-up element
On SS1, electric capacity C12 is parallel on velocity pick-up element SS12, and electric capacity C2 is parallel on temperature-sensing element (device) TS1, electric capacity
C22 is parallel on temperature-sensing element (device) TS12.
CRH5 EMUs integrated sensor speed testing device the most according to claim 1, it is characterised in that: described
RC low-pass filter circuit is in parallel by resistance R1 and resistance R2, resistance R12 and resistance R22 parallel connection two-way circuit are constituted, wherein
Resistance R1 and the resistance R2 RC low-pass filter circuit with electric capacity C1 composition velocity pick-up element SS1 in parallel, resistance R12 and electricity
The resistance R22 RC low-pass filter circuit with electric capacity C12 composition velocity pick-up element SS12 in parallel.
CRH5 EMUs integrated sensor speed testing device the most according to claim 1, it is characterised in that: described
Power supply first order protection circuit in be provided with varistor RV1 and varistor RV2, varistor RV1 and velocity pick-up element
SS1 is in parallel, and varistor RV2 is in parallel with velocity pick-up element SS12.
CRH5 EMUs integrated sensor speed testing device the most according to claim 1, it is characterised in that: described
Power supply second level protection circuit in be provided with Transient Voltage Suppressor V1 and Transient Voltage Suppressor V12, Transient Voltage Suppressor V1
In parallel with velocity pick-up element SS1, Transient Voltage Suppressor V12 is in parallel with velocity pick-up element SS12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610345745.0A CN105866461A (en) | 2016-05-20 | 2016-05-20 | Speed test device for integrated sensor of CRH (China railway high-speed) 5 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610345745.0A CN105866461A (en) | 2016-05-20 | 2016-05-20 | Speed test device for integrated sensor of CRH (China railway high-speed) 5 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105866461A true CN105866461A (en) | 2016-08-17 |
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ID=56634581
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610345745.0A Pending CN105866461A (en) | 2016-05-20 | 2016-05-20 | Speed test device for integrated sensor of CRH (China railway high-speed) 5 |
Country Status (1)
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| CN (1) | CN105866461A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107421574A (en) * | 2017-07-18 | 2017-12-01 | 宁波佳明测控技术有限公司 | A kind of portable testing stand of CRH5 EMUs integrated sensor |
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| CN107421574A (en) * | 2017-07-18 | 2017-12-01 | 宁波佳明测控技术有限公司 | A kind of portable testing stand of CRH5 EMUs integrated sensor |
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Application publication date: 20160817 |