CN108075761A - A kind of on-off model processing method of temperature self-compensation - Google Patents
A kind of on-off model processing method of temperature self-compensation Download PDFInfo
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- CN108075761A CN108075761A CN201711439317.5A CN201711439317A CN108075761A CN 108075761 A CN108075761 A CN 108075761A CN 201711439317 A CN201711439317 A CN 201711439317A CN 108075761 A CN108075761 A CN 108075761A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/003—Modifications for increasing the reliability for protection
- H03K19/00369—Modifications for compensating variations of temperature, supply voltage or other physical parameters
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Abstract
A kind of on-off model processing method of temperature self-compensation, the luminous tube input terminal of optocoupler connects the temperature-compensating being made of a linear PTC and NTC fitting electric resistance array according to batch optocoupler CTR characteristic curves using statistical theory design in on-off model processing unit, the characteristic curve that its whole resistance value varies with temperature has the rule similar to the characteristic curve that optocoupler CTR is affected by temperature, can effectively compensate automatically in the full operating temperature range of optocoupler by temperature change influenced caused by output voltage change.The adjustment that the output terminal connection of optocoupler triode is made of non-linear and linear PTC or NTC is fitted electric resistance array, and the situation for having apparent inflection point to the temperature characteristics of indivedual batch optocoupler CTR carries out specific adjusted.Can fundamentally compensation temperature influence caused by operation voltage variation, be not take up AD passages, and meet 55% 70% and open into voltage operation scope.
Description
Technical field
It is automatic suitable for electric power the present invention relates to the processing method of on-off model and the various devices of application this method
The protection control and automation equipment that on-off model gathers are needed in change system.
Background technology
In power automatic system, exist there is such as breaker, disconnecting switch, on-load switch etc. in the form of switching value
Auxiliary contact, these switching values are usually in high tension loop, and are also at the working environment of a strong electromagnetic
In.Because these reasons, the usual processing of On-off signal is to be carried out first by the way of the light-coupled isolation after isolation processing again
Carry out the acquisition of signal.And the protection control and automation equipment in power automatic system generally have and meet 55%-70%
Actuating range requirement, traditional method be according to optocoupler temperature characteristic parameter excursion, targetedly in life
The resistance that production link adjustment coordinates with it, makes operation voltage try one's best when being affected by temperature in the range of 55%-70%
Variation；Still an alternative is that the signal exported using the analog sampling AD passages access optocoupler of CPU, external switch amount is inputted
Signal changes into analog signals and is handled the actuating range for meeting 55%-70%, sometimes temperature sensor is coordinated to adopt
Sample carries out compensation to a certain extent.
At present, there are the following problems for the processing method of these on-off models：
1st, according to the method for optocoupler characteristic adjustment adaptation resistance, there are debugging work load is big, low production efficiency, moves after processing
Make voltage dispersion degree it is high, can not fundamentally compensation temperature influence caused by operation voltage variation the problems such as, and often
It is present with the situation that operation voltage under hot environment exceeds 70%.
2nd, using AD channel samples optocoupler output analog signals and coordinate the on-off model of temperature sensor thermometric
Processing method has certain compensation to operation voltage variation caused by temperature change, but does not consider between different batches optocoupler
The larger difference of CTR, so the compensation uniformity of operation voltage is not high in high temperature environments, it is also even to there is the situation beyond 70% to send out
It is raw.
The content of the invention
In order to fundamentally solve the problems, such as that temperature-compensating is insufficient and inconsistent, the present invention proposes a kind of temperature self-compensation
On-off model processing method, can fundamentally compensation temperature influence caused by operation voltage variation, be not take up AD
Passage, and meet the opening into voltage operation scope of 55%-70%.
To achieve the above object, solution of the invention is：A kind of on-off model processing method of temperature self-compensation,
Include the following steps：
Step 1: the current transfer ratio CTR numbers of Ta=25 DEG C of its environment temperature are obtained according to the optocoupler of a batch first
According to drawing current transfer ratio CTR- temperature characteristics, determine the current transfer ratio CTR distributed areas of this batch optocoupler；
The data provided if producer provides current transfer ratio CTR data using producer if producer does not provide, are used
Test fixture detects the optocoupler that this batch is sampled according to statistical theory, and after hypothesis testing, draws current transfer ratio CTR temperature
Characteristic curve is spent, the region that two current transfer ratio CTR- temperature characterisitics restrictive curves intersect package is that the electric current of this batch passes
It is defeated than CTR distributed areas.
Step 2: according to the principle of share current transfer ratio CTR distributed areas, fit object curve is obtained；
It is fitted Step 3: approaching fitting algorithm using minimum, determines to be connected to optocoupler luminous tube input terminal
The quantity of positive temperature coefficient thermistor PTC and negative temperature coefficient thermistor NTC in temperature-compensating fitting electric resistance array
And resistance value.The temperature-compensating fitting electric resistance array is the characteristic curve being affected by temperature according to optocoupler current transfer ratio CTR
Design combines several linear positive temperature coefficient thermistor PTC and negative temperature coefficient with different resistance values and temperature characterisitic
Thermal resistor NTC.
When the current transfer ratio CTR- temperature characteristics of this batch optocoupler has apparent inflection point, according to current transfer ratio
The inflection point of CTR- temperature characteristics determines to be connected to positive temperature coefficient in the adjustment fitting electric resistance array of optocoupler output
The quantity and resistance value of thermal resistor PTC and negative temperature coefficient thermistor NTC.Optocoupler output is connected by non-linear and line
Property PTC or NTC composition adjustment fitting electric resistance array have to the temperature characteristics of indivedual batch optocoupler current transfer ratio CTR
The situation of apparent inflection point carries out specific adjusted.
Current transfer ratio CTR distributed areas intersect for two current transfer ratio CTR- temperature characterisitics limit graphs in step 1
Wrap up region.
The characteristic curve that the whole resistance value of the temperature-compensating fitting electric resistance array varies with temperature has and optocoupler electric current
The similar rule of characteristic curve that transfer ratio CTR is affected by temperature, the whole resistance value of temperature-compensating fitting electric resistance array is with temperature
Fit object curve described in the characteristic curve fitting step 2 of variation, temperature-compensating fitting electric resistance array can be mended effectively automatically
Repay in optocoupler operating temperature range by temperature change influenced caused by output voltage change.
Due to its principle and manufacturing process, the current transfer ratio CTR of same model optocoupler has to be compared optic coupling element
Big discreteness (generally in 50%-600% or so) but in the case where direct current input current If is basically unchanged, electric current transmission
Variation than CTR is mainly determined by temperature change and manufacture batch, it is possible to screening separation is carried out in units of batch, and is built
Vertical corresponding optocoupler current transfer ratio CTR- temperature characteristics record.When optocoupler is operated in linear zone, current transfer ratio
There is proportionate relationship Ic=If*CTR between CTR, direct current input current And if average anode current Ic.The present invention utilizes light
The temperature characteristics record of coupling current transfer ratio CTR, carries out the design of temperature-compensating fitting electric resistance array.
Utilize two kinds of linear positive temperature coefficient thermistor PTC and negative temperature coefficient thermistor NTC thermistor
Opposite varies with temperature and the characteristic of change in resistance, selects different resistance values and temperature coefficient, and just this can be utilized by design
Two kinds of slopes opposite (change direction), the Resistance Fitting of stride different (temperature coefficient influences) go out and optocoupler current transfer ratio CTR
The basically identical thermo-compensator array of temperature characteristics.For the output terminal of optocoupler, in the case of necessary may be used
With using linear either nonlinear positive temperature coefficient thermistor PTC or negative temperature coefficient thermistor NTC and essence
Close resistor coupled in parallel carries out inflection point adjustment directly against output voltage.
Voltage output after eventually passing through as above compensation and adjusting connects the Transistor-Transistor Logic level form of CPU or peripheral components
Input pin can meet in optocoupler full operating range 55%~70% actuating range of (such as -40 DEG C~85 DEG C) without transfiniting.
Beneficial effects of the present invention：
1. this solution can accomplish to compensate automatically for the variation of operation voltage caused by temperature change, be not take up and according to
Rely the AD channel resources of CPU, it is easy to use without software development.
2. compared with conventional method, using and compensated and adjusted in units of batch, compensation precision is high, full operating range (as-
40 DEG C~85 DEG C) in meet actuating range and do not transfinite.
3. because solving temperature-compensating by the way of devices at full hardware, the production of corresponding intrument, debugging, test, each ring of inspection
Section mass is efficient, and personnel's skill set requirements are low.
Operation voltage caused by 4. the temperature directly against on-off model processing links influences is Passively compensated, at low cost
It is honest and clean, it is widely applicable；The compatibility of software release upgrade and CPU upgradings is high, without developing again.
Description of the drawings
Fig. 1 is the work flow diagram of the present invention；
Fig. 2 is the implementation schematic diagram of the present invention；
Fig. 3 is current transfer ratio CTR temperature characteristics figures；
Fig. 4 is temperature-compensating fitting electric resistance array fit object graph；
Fig. 5 is the compensation resistance data after temperature-compensating fitting electric resistance array parallel connection.
Specific embodiment
With reference to the accompanying drawings and detailed description to a kind of on-off model processing mode of temperature self-compensation of the present invention
It is further described.
The on-off model processing method of a kind of temperature self-compensation, as shown in Figure 1, including the following steps：
Step 1: the current transfer ratio CTR numbers of Ta=25 DEG C of its environment temperature are obtained according to the optocoupler of a batch first
According to the current transfer ratio CTR- temperature characteristics in drafting Fig. 3, curve 1 and curve 2 are current transfer ratio CTR data distributions
Limit graph, the current transfer ratio CTR distributed areas of this batch optocoupler are determined by this two curved intersections package region；
Step 2: according to the principle of share current transfer ratio CTR distributed areas, the fit object curve in Fig. 4 is obtained；
It is fitted Step 3: approaching fitting algorithm using minimum, determines to be connected to optocoupler luminous tube input terminal
The quantity of positive temperature coefficient thermistor PTC and negative temperature coefficient thermistor NTC in temperature-compensating fitting electric resistance array
And resistance value.
On-off model level is 220V, select direct current input current If=1mA for Ta=25 DEG C of environment temperature when work
Make electric current, compensating resistance in fitting electric resistance array for the ease of latter temperature selects, and only sets resistance R1 and temperature in advance
The sum of compensation fitting electric resistance array parallel resistance value is 220K.According to the desired value of the fit object curve of Fig. 4, positive temperature is set
The Standard resistance range of coefficient thermal resistor PTC and negative temperature coefficient thermistor NTC are 50K~100K, temperature coefficient value
Scope is the device of 1000ppm~5000ppm, positive temperature coefficient thermistor PTC or negative temperature coefficient thermistor NTC
It is linear that number of packages amount, which is up to 2, temperature coefficient pattern, and approaching fitting algorithm using minimum is fitted.Finally, synthesis is optimal
PTC and NTC schemes are：The NTC resistance of the PTC resistor of 1 100K resistance values 3000PPM, 1 200K resistance values 3000PPM.Using this
Resistance value such as Fig. 5 can be fitted in -50 DEG C~100 DEG C temperature ranges after linear varistor parallel connection, fitness bias is
1.1%, maximum comprehensive theory deviation is 3.4% at limiting temperature.
According to the characteristic curve of this batch current transfer ratio CTR- temperature, without apparent inflection point, without fitting adjustment electricity
The resistance of resistance, i.e. optocoupler output connection need to only determine that resistance R2 is 2K according to average anode current Ic and current transfer ratio CTR.It examines
Consider device production and synthesis precision error, it is 150K Ω to determine resistance R1.
The embodiment that the present invention is handled for on-off model is a kind of typical way, and those skilled in the art are based on this
The solution method of inventive concept is within protection scope of the present invention.
Claims (4)
1. the on-off model processing method of a kind of temperature self-compensation, it is characterised in that include the following steps：
Step 1: obtaining the current transfer ratio CTR data of Ta=25 DEG C of its environment temperature according to the optocoupler of a batch first, paint
Current transfer ratio CTR- temperature characteristics processed determines the current transfer ratio CTR distributed areas of this batch optocoupler；
Step 2: according to the principle of share current transfer ratio CTR distributed areas, fit object curve is obtained；
It is fitted Step 3: approaching fitting algorithm using minimum, determines to be connected to the temperature of optocoupler luminous tube input terminal
The quantity and resistance of positive temperature coefficient thermistor PTC and negative temperature coefficient thermistor NTC in compensation fitting electric resistance array
Value.
2. the on-off model processing method of temperature self-compensation according to claim 1, which is characterized in that passed according to electric current
The defeated inflection point than CTR- temperature characteristics determines to be connected to positive temperature in the adjustment fitting electric resistance array of optocoupler output
The quantity and resistance value of coefficient thermal resistor PTC and negative temperature coefficient thermistor NTC.
3. the on-off model processing method of temperature self-compensation according to claim 1, which is characterized in that electric in step 1
Steaming transfer intersects package region than CTR distributed areas for two current transfer ratio CTR- temperature characterisitics limit graphs.
4. the on-off model processing method of temperature self-compensation according to claim 1, which is characterized in that the temperature is mended
Repay the fit object curve described in the characteristic curve fitting step 2 that varies with temperature of whole resistance value of fitting electric resistance array, temperature
Degree compensation fitting electric resistance array can effectively compensate automatically in optocoupler operating temperature range by temperature change influenced caused by output
The variation of voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711439317.5A CN108075761B (en) | 2017-12-26 | 2017-12-26 | Temperature self-compensation switching value signal processing method |
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| CN201711439317.5A CN108075761B (en) | 2017-12-26 | 2017-12-26 | Temperature self-compensation switching value signal processing method |
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| CN108075761A true CN108075761A (en) | 2018-05-25 |
| CN108075761B CN108075761B (en) | 2021-01-26 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108760069A (en) * | 2018-06-05 | 2018-11-06 | 南京南瑞继保电气有限公司 | A kind of processing method of On-off signal signal |
| CN109274252A (en) * | 2018-09-03 | 2019-01-25 | 杭州中恒电气股份有限公司 | A kind of follow-on Switching Power Supply loop compensation circuit |
| CN109901011A (en) * | 2019-02-19 | 2019-06-18 | 中国电力科学研究院有限公司 | A kind of determining fuse drop holds the method and system of coefficient |
| CN112583071A (en) * | 2020-11-27 | 2021-03-30 | 上海航天控制技术研究所 | Power supply system for deep space exploration separation monitoring satellite |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108760069A (en) * | 2018-06-05 | 2018-11-06 | 南京南瑞继保电气有限公司 | A kind of processing method of On-off signal signal |
| CN109274252A (en) * | 2018-09-03 | 2019-01-25 | 杭州中恒电气股份有限公司 | A kind of follow-on Switching Power Supply loop compensation circuit |
| CN109901011A (en) * | 2019-02-19 | 2019-06-18 | 中国电力科学研究院有限公司 | A kind of determining fuse drop holds the method and system of coefficient |
| CN112583071A (en) * | 2020-11-27 | 2021-03-30 | 上海航天控制技术研究所 | Power supply system for deep space exploration separation monitoring satellite |
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Inventor after: Xu Baoluo Inventor after: Hao Lei Inventor after: Yan Zhonghua Inventor after: Cong Chuntao Inventor after: Zhou Wenjun Inventor before: Xu Baoluo Inventor before: Hao Lei Inventor before: Tian Dongshun Inventor before: Cong Chuntao Inventor before: Zhou Wenjun |
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