CN207297240U - A kind of braking resistor resistance value and temperature on-line monitoring device - Google Patents
A kind of braking resistor resistance value and temperature on-line monitoring device Download PDFInfo
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- CN207297240U CN207297240U CN201721218628.4U CN201721218628U CN207297240U CN 207297240 U CN207297240 U CN 207297240U CN 201721218628 U CN201721218628 U CN 201721218628U CN 207297240 U CN207297240 U CN 207297240U
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- resistance
- braking resistor
- input terminal
- amplifier
- output terminal
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Abstract
The utility model discloses a kind of braking resistor resistance value and temperature on-line monitoring device, it is characterized in that, including braking resistor, the input terminal of the output terminal connection electronic switch unit of braking resistor, the input terminal of the output terminal connection sampling unit of electronic switch unit, the input terminal and dc bus anode of the output terminal difference connection processing device of sampling unit, the input terminal of the output terminal connection PWM generating units of processor, the input terminal of the output terminal connection electronic switch unit of PWM generating units, the input terminal connection dc bus cathode of braking resistor.The utility model overcomes the deficiencies in the prior art, by common component and simple circuit structure and in the case of not increasing any cost and resource, realizes braking resistor resistance value and on-line temperature monitoring.The utility model also overcomes the problem of temperature in use sensor, method measures, causes the data precision poor in the prior art, substantially increases the precision of measurement.
Description
Technical field
A kind of braking resistor resistance value and temperature on-line monitoring device are the utility model is related to, belongs to wind power plant technology
Field.
Background technology
Small-sized wind power generator cost is higher at present, is mostly fixed pitch design, and do not have wind-speed sample device, control system
It is relatively simple, it is to carry out pressure limiting drain charge control by means of braking resistor mostly.Due to the most environment installed outdoors of braking resistor,
The damages such as braking resistor short circuit or open circuit may occur in the case of artificial or natural disaster, if system can not obtain braking electricity in advance
Information is hindered, once strong wind arrival system will be unable to make corresponding control strategy in advance, wind turbine windmill, system may finally be caused
Damage.Braking resistor needs to consume big energy under high wind conditions, causes fever serious, and especially being loaded in off-network application needs
When asking power smaller, most of energy expenditure both increases the machinery of wind-driven generator in braking resistor under high wind conditions
Loss, and the requirement of long term overloading ability is improved to braking resistor, so it is system to obtain braking resistor resistance value and temperature
Control mode provides data and is just particularly important.
Under existing industry control use environment, most electric machine control systems can not judge resistance value and temperature in itself, thus
Security risk has been buried in safe operation to system, therefore the on-line monitoring function of braking resistor just seems particularly heavy in system
Will.
The content of the invention
The technical problems to be solved in the utility model is：Provide a kind of measurement precision high braking resistor resistance value and temperature
On-Line Monitor Device is spent, solves the problems, such as how to obtain braking resistor resistance value and temperature.
In order to solve the above-mentioned technical problem, the technical solution of the utility model there is provided a kind of braking resistor resistance value and temperature
Spend on-Line Monitor Device, it is characterised in that including braking resistor, the input of the output terminal connection electronic switch unit of braking resistor
End, the input terminal of the output terminal connection sampling unit of electronic switch unit, the output terminal difference connection processing device of sampling unit
Input terminal and dc bus anode, the input terminal of the output terminal connection PWM generating units of processor, (PWM is English to PWM
" abbreviation of Pulse Width Modulation ", abbreviation pulsewidth modulation, are come to simulation using the numeral output of microprocessor
A kind of very effective technology that circuit is controlled, is widely used in many fields such as Power Control and conversion.) generating unit
Output terminal connection electronic switch unit input terminal, braking resistor input terminal connection dc bus cathode.
Preferably, the both ends of a braking resistor diode in parallel, the both ends of sampling unit are one first in parallel
Resistance and a second resistance, the input terminal of braking resistor and the output terminal of sampling unit connect with the both ends of the first capacitance respectively
Connect.
Preferably, the sampling unit includes differential filtering operational amplification circuit and operation amplifier holding circuit；Difference
Filtering operation amplifying circuit includes the tenth resistance, the 5th resistance, and one end of one end of the tenth resistance and the 5th resistance is respectively with the
The both ends connection of three capacitances, one end of one end connection 3rd resistor of the tenth resistance, the other end connection first of 3rd resistor are put
No. 2 ports of big device, one end of the 5th resistance connect one end of the 6th resistance, and the other end of the 6th resistance connects first and puts respectively
Big No. 3 ports of device and one end of the 7th resistance, the first amplifier2Number port and No. 1 port of the first amplifier are parallel with
One the 11st resistance；Operation amplifier holding circuit includes the 8th resistance, and one end of the 8th resistance connects the second amplifier respectively
No. 2 ports and the 9th resistance one end, No. 1 port of the second amplifier connects one end of the 4th resistance, the 4th resistance it is another
One end connects the cathode of second diode, the other end of the anode of the second diode and the 9th resistance with the second capacitance
One end connects, the other end ground connection of the second capacitance；No. 1 port of the first amplifier is connected with No. 3 ports of the second amplifier, the
The other end of seven resistance is connected with the other end of the 8th resistance, the 7th resistance and the 8th resistance indirectly.
The utility model overcomes the deficiencies in the prior art, by common component and simple circuit structure and does not increase
In the case of any cost and resource, braking resistor resistance value and on-line temperature monitoring are realized.While function is realized, braking
The on-line monitoring of resistance is liberated the staff that knows clearly and is inspected periodically and from system electrification run-limiting.The utility model is also
The problem of overcoming temperature in use sensor, method measurement in the prior art, causing the data precision poor, substantially increases measurement
Precision.
Brief description of the drawings
Fig. 1 is the functional block diagram of a kind of braking resistor resistance value and temperature on-line monitoring device；
Fig. 2 is the electrical schematic diagram of a kind of braking resistor resistance value and temperature on-line monitoring device；
Fig. 3 is the peak point current sample circuit figure of a kind of braking resistor resistance value and temperature on-line monitoring device.
Embodiment
To become apparent the utility model, hereby with preferred embodiment, and attached drawing is coordinated to be described in detail below.
The utility model is a kind of braking resistor resistance value and temperature on-line monitoring device, as shown in Figure 1, it includes braking electricity
Resistance, electronic switch unit, PWM generating units, sampling unit and processor；Dc bus cathode connects the input of braking resistor
End, the input terminal of the output terminal connection electronic switch unit of braking resistor, the output terminal connection sampling unit of electronic switch unit
Input terminal, sampling unit output terminal difference connection processing device input terminal and dc bus anode, the output terminal of processor
Connect the input terminal of PWM generating units, the input terminal of the output terminal connection electronic switch unit of PWM generating units.
Each unit circuit function is respectively：
1st, braking resistor：For consumed energy；
2nd, electronic switch unit：For controlling turning on and off for braking resistor circuit；
3rd, PWM generating units：For driving electronic switch unit to turn on and off；
4th, sampling unit：For the voltage signal sampled to be amplified and conversion process；
5th, processor：On the one hand driven by sampling DC bus-bar voltage and control electronic switch unit duty cycle, reached
Isobarically Control；On the other hand amplified by sampling unit signal and braking resistor electric current and temperature is calculated in conversion.
As shown in Fig. 2, one diode D1 of both ends parallel connection of braking resistor, both ends one first electricity in parallel of sampling unit
Hinder R1 and second resistance R2, the input terminal of braking resistor and the output terminal of sampling unit both ends with the first capacitance C1 respectively
Connection
As shown in figure 3, sampling unit is made of two parts：Part I include the 3rd capacitance C3, the tenth resistance R10,
11st resistance R11,3rd resistor R3, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the first amplifier U1A, jointly
Constitute differential filtering operational amplification circuit；Part II includes the 4th resistance R4, the 8th resistance R8, the 9th resistance R9, second
Diode D2, the second capacitance C2, the second amplifier U2A, have collectively constituted operation amplifier holding circuit.
The both ends of one end of tenth resistance R10 and one end of the 5th resistance R5 respectively with the 3rd capacitance C3 are connected, the tenth electricity
One end of one end connection 3rd resistor R3 of R10 is hindered, the other end of 3rd resistor R3 connects No. 2 ports of the first amplifier U1A,
One end of 5th resistance R5 connects one end of the 6th resistance R6, and the other end of the 6th resistance R6 connects the first amplifier U1A respectively
No. 3 ports and the 7th resistance R7 one end, No. 2 ports of the first amplifier U1A and No. 1 port of the first amplifier U1A are simultaneously
A the 11st resistance R11 is associated with, one end of the 8th resistance R8 connects No. 2 ports and the 9th electricity of the second amplifier U2A respectively
One end of R9 is hindered, No. 1 port of the second amplifier U2A connects one end of the 4th resistance R4, the other end connection of the 4th resistance R4
The cathode of one the second diode D2, the anode of the second diode D2 and the other end of the 9th resistance R9 are with the second capacitance C2's
One end connects, the other end ground connection of the second capacitance C2, No. 1 port of the first amplifier U1A and No. 3 ends of the second amplifier U2A
Mouth connection, the other end of the 7th resistance R7 is connected with the other end of the 8th resistance R8, between the 7th resistance R7 and the 8th resistance R8
Ground connection.
For braking resistor according to the difference of material, its distinctive physical attribute can obtain temperature coefficient, coordinate braking resistor
Initial resistance value, can finally calculate the temperature of current time braking resistor.
Braking resistor resistance value and temperature on-line monitoring device software implementation step are as follows：
1) Ipeak (peak point current) signal that sampling obtains is converted into true peak electric current by processor；
2) Udc (busbar voltage) signal that sampling obtains is converted into actual bus voltage by processor；
3) software calculates braking resistor resistance value according to Ohm's law (i.e. R=U/I)；
4) software carries out examination to above true peak electric current, voltage and resistance value, rejects smaller and larger numerical value；
5) multiple averaging is carried out to the qualified resistance value of examination, finally obtains and cry as accurately braking resistor resistance value；
6) by braking resistor resistance value initial value and the temperature coefficient of material, according to formula TCR=(R2-R1)/(R1* (T2-
T1), the temperature of current time braking resistor can finally be calculated.
The utility model controls DC bus-bar voltage, its concrete operating principle by controlling braking resistor to turn on and off
It is as follows：
Udc+ cathodes send female according to the direct current sampled to electronic switch unit Z1 input terminals, processor by braking resistor
Line voltage signals to PWM generating units, it is exported the PWM arteries and veins that high-frequency duty cycle is changed proportionally with input voltage
It is wide.Electronic switch unit Z1 drive ends are accessed with this PWM pulsewidth, turning on and off for electronic switch high speed is driven with this.Electronics
Switch element Z1 opens rear output terminal and flows into dc bus anode Udc- by sampling unit.The signal that sampling unit will sample
It is filtered, amplifies and obtain signal IxhRC, then IxhMax (i.e. Ipeak) most peaks at last is obtained by amplification peak holding circuit
Value signal sends processor to.Processor carries out analysis calculating according to the current signal sampled, obtains flowing through braking resistor wink
When electric current.Braking resistor reality is calculated than flowing through the transient current of braking resistor according to DC bus-bar voltage in final braking resistor
When resistance value (R=U/I), real-time resistance value carries out most filtering process and obtains more accurately braking resistor resistance value.
For braking resistor according to the difference of material, its distinctive physical attribute can obtain temperature coefficient, coordinate braking resistor
Initial resistance value, according to formula TCR=(R2-R1)/(R1* (T2-T1), can finally calculate the temperature of current time braking resistor
Degree.
Claims (3)
1. a kind of braking resistor resistance value and temperature on-line monitoring device, it is characterised in that including braking resistor, braking resistor it is defeated
Outlet connects the input terminal of electronic switch unit, the input terminal of the output terminal connection sampling unit of electronic switch unit, sampling list
The input terminal and dc bus anode of the output terminal difference connection processing device of member, the output terminal connection PWM generating units of processor
Input terminal, PWM generating units output terminal connection electronic switch unit input terminal, braking resistor input terminal connection direct current
Busbar cathode.
2. a kind of braking resistor resistance value as claimed in claim 1 and temperature on-line monitoring device, it is characterised in that the system
A both ends diode (D1) in parallel for dynamic resistance, a both ends first resistor (R1) in parallel for sampling unit and one second electricity
Hinder (R2), the both ends of the input terminal of braking resistor and the output terminal of sampling unit respectively with the first capacitance (C1) are connected.
3. a kind of braking resistor resistance value as claimed in claim 2 and temperature on-line monitoring device, it is characterised in that described adopts
Sample unit includes differential filtering operational amplification circuit and operation amplifier holding circuit；Differential filtering operational amplification circuit includes the tenth
Resistance (R10), the 5th resistance (R5), one end of the tenth resistance (R10) and one end of the 5th resistance (R5) respectively with the 3rd capacitance
(C3) both ends connection, one end of one end connection 3rd resistor (R3) of the tenth resistance (R10), the other end of 3rd resistor (R3)
No. 2 ports of the first amplifier (U1A) are connected, one end of the 5th resistance (R5) connects one end of the 6th resistance (R6), the 6th electricity
The other end of resistance (R6) connects No. 3 ports of the first amplifier (U1A) and one end of the 7th resistance (R7), the first amplifier respectively
(U1A) No. 2 ports and No. 1 port of the first amplifier (U1A) are parallel with the 11st resistance (R11)；Operation amplifier is protected
Holding circuit includes the 8th resistance (R8), and one end of the 8th resistance (R8) connects No. 2 ports and of the second amplifier (U2A) respectively
One end of nine resistance (R9), No. 1 port of the second amplifier (U2A) connect one end of the 4th resistance (R4), the 4th resistance (R4)
The other end connect the cathode of second diode (D2), the anode of the second diode (D2) and the 9th resistance (R9) it is another
One end with the second capacitance (C2) is held to be connected, the other end ground connection of the second capacitance (C2)；No. 1 end of the first amplifier (U1A)
Mouth is connected with No. 3 ports of the second amplifier (U2A), and the other end of the 7th resistance (R7) and the other end of the 8th resistance (R8) connect
Connect, the 7th resistance (R7) and the 8th resistance (R8) indirectly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721218628.4U CN207297240U (en) | 2017-09-21 | 2017-09-21 | A kind of braking resistor resistance value and temperature on-line monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721218628.4U CN207297240U (en) | 2017-09-21 | 2017-09-21 | A kind of braking resistor resistance value and temperature on-line monitoring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207297240U true CN207297240U (en) | 2018-05-01 |
Family
ID=62442245
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721218628.4U Active CN207297240U (en) | 2017-09-21 | 2017-09-21 | A kind of braking resistor resistance value and temperature on-line monitoring device |
Country Status (1)
| Country | Link |
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| CN (1) | CN207297240U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109765431A (en) * | 2019-01-08 | 2019-05-17 | 科华恒盛股份有限公司 | Resistance measuring circuit, temperature sensing circuit and charging gun |
| CN110535335A (en) * | 2018-05-25 | 2019-12-03 | 株洲中车时代电气股份有限公司 | It is a kind of for controlling the method and system of switching device in energy leadage circuit |
-
2017
- 2017-09-21 CN CN201721218628.4U patent/CN207297240U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110535335A (en) * | 2018-05-25 | 2019-12-03 | 株洲中车时代电气股份有限公司 | It is a kind of for controlling the method and system of switching device in energy leadage circuit |
| CN110535335B (en) * | 2018-05-25 | 2020-12-08 | 株洲中车时代电气股份有限公司 | Method and system for controlling switching device in energy discharge circuit |
| CN109765431A (en) * | 2019-01-08 | 2019-05-17 | 科华恒盛股份有限公司 | Resistance measuring circuit, temperature sensing circuit and charging gun |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190510 Address after: 20111 Four Second Floor 201-203, No. 1281 Xianghua Road, Songjiang District, Shanghai Patentee after: Shanghai Ruiyi Information Technology Co.,Ltd. Address before: 201600 No. 202 Liuye Road, Chedun Town, Songjiang District, Shanghai Patentee before: SHANGHAI GHREPOWER GREEN ENERGY Co.,Ltd. |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20221221 Address after: No. 80, Jingche Road, Chedun Town, Songjiang District, Shanghai, November 2016 Patentee after: Shanghai Zhengdie Automatic Control Equipment Co.,Ltd. Address before: 20111 Four Second Floor 201-203, No. 1281 Xianghua Road, Songjiang District, Shanghai Patentee before: Shanghai Ruiyi Information Technology Co.,Ltd. |
|
| TR01 | Transfer of patent right |