CN108075761B - Temperature self-compensation switching value signal processing method - Google Patents
Temperature self-compensation switching value signal processing method Download PDFInfo
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- CN108075761B CN108075761B CN201711439317.5A CN201711439317A CN108075761B CN 108075761 B CN108075761 B CN 108075761B CN 201711439317 A CN201711439317 A CN 201711439317A CN 108075761 B CN108075761 B CN 108075761B
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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
Abstract
A temperature self-compensating switching value signal processing method is characterized in that the input end of a light emitting tube of an optical coupler in a switching value signal processing device is connected with a temperature compensation fitting resistor array which is designed according to a batch optical coupler CTR characteristic curve by adopting a statistical theory and consists of linear PTC and NTC, the characteristic curve of the integral resistance value changing along with the temperature has a rule similar to the characteristic curve of the optical coupler CTR influenced by the temperature, and the change of output voltage caused by the influence of the temperature change in the full working temperature range of the optical coupler can be effectively and automatically compensated. The output end of the optocoupler triode is connected with an adjusting fitting resistor array composed of nonlinear and linear PTC or NTC, and specific adjustment is carried out on the condition that the temperature characteristic curve of the individual batch optocoupler CTR has an obvious inflection point. The change of the action voltage caused by temperature influence can be fundamentally compensated, an AD channel is not occupied, and 55-70% of the action range of the starting voltage is met.
Description
Technical Field
The invention relates to a method for processing switching value signals and various devices applying the method, which are suitable for protection control and automation devices needing switching value signal acquisition in a power automation system.
Background
In power automation systems, there are auxiliary contacts in the form of switching variables, such as circuit breakers, disconnectors, load switches, which are usually located in high-voltage circuits and also in a highly electromagnetically disturbing operating environment. For these reasons, the common processing of the switching value input is to firstly perform isolation processing in an optical coupling isolation manner and then perform signal acquisition. Protection control and automation devices in the electric power automation system generally meet the requirement of 55-70% of action range, and the traditional method is that the resistance value of a resistor matched with the protection control and automation device is pertinently adjusted in a production link according to the change range of temperature characteristic parameters of an optical coupler, so that the action voltage is changed in the range of 55-70% as much as possible when influenced by temperature; in another method, an analog sampling AD channel of a CPU is used to access a signal output by an optical coupler, and an external switching value input signal is converted into an analog signal to be processed so as to satisfy 55% to 70% of an action range, and sometimes compensation is performed to a certain extent in cooperation with sampling of a temperature sensor.
At present, the processing methods of the switching value signals have the following problems:
1. the method for adjusting the adaptive resistor according to the optical coupling characteristics has the problems of large debugging workload, low production efficiency, high dispersion of the action voltage after processing, incapability of fundamentally compensating the change of the action voltage caused by temperature influence and the like, and the condition that the action voltage exceeds 70% in a high-temperature environment often occurs.
2. An analog quantity signal output by the optical coupler is sampled by an AD channel and is matched with a switching value signal processing method for temperature measurement of a temperature sensor, certain compensation is carried out on action voltage change caused by temperature change, but the larger difference of CTR among optical couplers of different batches is not considered, so that the compensation consistency of the action voltage under a high-temperature environment is not high, and the situation that the compensation consistency exceeds 70% occasionally occurs.
Disclosure of Invention
In order to fundamentally solve the problems of insufficient and inconsistent temperature compensation, the invention provides a temperature self-compensation switching value signal processing method which can fundamentally compensate the change of the action voltage caused by the temperature influence, does not occupy an AD channel and meets the action range of the switching voltage of 55-70%.
In order to achieve the above purpose, the solution of the invention is: a temperature self-compensating switching value signal processing method comprises the following steps:
firstly, acquiring Current Transmission Ratio (CTR) data of an environment temperature Ta of one batch of optical couplers at 25 ℃, drawing a Current Transmission Ratio (CTR) -temperature characteristic curve, and determining a Current Transmission Ratio (CTR) distribution area of the batch of optical couplers;
and if the manufacturer provides the current transmission ratio CTR data, the data provided by the manufacturer is adopted, if the manufacturer does not provide the data, the optical coupler sampled for the batch is detected by using a testing tool according to a statistical theory, a temperature characteristic curve of the current transmission ratio CTR is drawn after hypothesis test, and an area crossed and wrapped by the two current transmission ratio CTR-temperature characteristic limiting curves is a current transmission ratio CTR distribution area for the batch.
Step two, obtaining a fitting target curve according to the principle of an average Current Transmission Ratio (CTR) distribution area;
and thirdly, fitting by adopting a minimum approximation fitting algorithm, and determining the quantity and the resistance value of the positive temperature coefficient thermistor PTC and the negative temperature coefficient thermistor NTC in the temperature compensation fitting resistor array connected to the input end of the optical coupler luminotron. The temperature compensation fitting resistor array is designed and combined with a plurality of linear Positive Temperature Coefficient (PTC) thermistors and Negative Temperature Coefficient (NTC) thermistors with different resistance values and temperature characteristics according to a characteristic curve that the Current Transmission Ratio (CTR) of the optical coupler is influenced by temperature.
When the current transmission ratio CTR-temperature characteristic curve of the batch of optical couplers has an obvious inflection point, the quantity and the resistance value of the positive temperature coefficient thermistor PTC and the negative temperature coefficient thermistor NTC in the adjusting fitting resistor array connected with the output end of the optical couplers are determined according to the inflection point of the current transmission ratio CTR-temperature characteristic curve. The output end of the optical coupler is connected with an adjusting fitting resistor array consisting of nonlinear and linear PTC or NTC, and the adjusting fitting resistor array is used for specifically adjusting the condition that the temperature characteristic curve of the current transmission ratio CTR of the optical coupler of an individual batch has an obvious inflection point.
In the first step, the current transmission ratio CTR distribution region is a cross wrapping region of two current transmission ratio CTR-temperature characteristic limit value curves.
The characteristic curve of the overall resistance value of the temperature compensation fitting resistor array changing along with the temperature has a rule similar to the characteristic curve of the optocoupler current transmission ratio CTR influenced by the temperature, the characteristic curve of the overall resistance value of the temperature compensation fitting resistor array changing along with the temperature is fitted with the target curve, and the temperature compensation fitting resistor array can effectively and automatically compensate the change of output voltage caused by the influence of the temperature change in the optocoupler working temperature range.
Due to the principle and the manufacturing process of the optical coupler element, the current transmission ratio CTR of the optical coupler with the same model has larger discreteness (generally about 50% -600%), but under the condition that the direct current input current If is basically unchanged, the change of the current transmission ratio CTR is mainly determined by temperature change and manufacturing batches, so that screening separation can be carried out by taking the batches as units, and corresponding records of the current transmission ratio CTR-temperature characteristic curve of the optical coupler are established. When the optical coupler works in a linear region, the current transmission ratio CTR, the direct current input current If and the direct current output current Ic have a proportional relation Ic ═ If ×. CTR. The invention designs the temperature compensation fitting resistor array by utilizing the temperature characteristic curve record of the current transmission ratio CTR of the optical coupler.
The temperature compensation resistor array which is basically consistent with the temperature characteristic curve of the current transmission ratio CTR of the optical coupler can be fitted by using two opposite resistors with opposite slopes (change directions) and different steps (temperature coefficient influence) through design by utilizing two opposite characteristics of the PTC thermistor and the NTC thermistor, wherein the resistance changes along with the temperature change, and different resistances and temperature coefficients are selected. For the output end of the optical coupler, a linear or nonlinear positive temperature coefficient thermistor (PTC) or negative temperature coefficient thermistor (NTC) can be connected with a precision resistor in parallel under the necessary condition, and the inflection point adjustment is directly carried out on the output voltage.
The voltage output after the compensation and the adjustment is connected with an input pin in a TTL level form of a CPU or a peripheral device, and the operation range of 55-70% of the full working range (such as-40-85 ℃) of the optical coupler can be met without exceeding the limit.
The invention has the beneficial effects that:
1. the solution can automatically compensate for the change of the action voltage caused by the temperature change, does not occupy and depend on the AD channel resource of the CPU, does not need software development, and is simple and easy to use.
2. Compared with the traditional method, the compensation and adjustment are carried out by taking batches as units, the compensation precision is high, and the full working range (such as-40-85 ℃) can meet the action range without exceeding the limit.
3. Because the temperature compensation is realized by adopting a full-hardware mode, the batch efficiency of all links of production, debugging, testing and inspection of the corresponding device is high, and the requirement on the skill of personnel is low.
4. The passive compensation of the action voltage caused by the temperature influence of the switching value signal processing link is directly aimed at, the cost is low, and the passive compensation method is widely applicable; the compatibility of software version upgrading and CPU upgrading is high, and secondary development is not needed.
Drawings
FIG. 1 is a flow chart of the operation of the present invention;
FIG. 2 is a schematic diagram of an implementation of the present invention;
FIG. 3 is a graph of current transfer ratio CTR temperature characteristics;
FIG. 4 is a graph of a temperature compensated fit resistor array fit target;
FIG. 5 is the compensated resistance data after parallel connection of the temperature compensated fitted resistor arrays.
Detailed Description
The following describes a temperature self-compensated switching value signal processing method according to the present invention in detail with reference to the accompanying drawings and the detailed description.
A method for processing a temperature self-compensated switching value signal, as shown in fig. 1, includes the following steps:
firstly, acquiring Current Transmission Ratio (CTR) data of an environment temperature Ta of one batch of optical couplers at 25 ℃, drawing a Current Transmission Ratio (CTR) -temperature characteristic curve in a graph 3, wherein a curve 1 and a curve 2 are limit curves of Current Transmission Ratio (CTR) data distribution, and determining a Current Transmission Ratio (CTR) distribution area of the batch of optical couplers according to a crossed wrapping area of the two curves;
step two, obtaining a fitting target curve in the graph 4 according to the principle of the distribution area of the average current transmission ratio CTR;
and thirdly, fitting by adopting a minimum approximation fitting algorithm, and determining the quantity and the resistance value of the positive temperature coefficient thermistor PTC and the negative temperature coefficient thermistor NTC in the temperature compensation fitting resistor array connected to the input end of the optical coupler luminotron.
The switching value signal level is 220V, the selected direct current input current If is 1mA is the working current when the ambient temperature Ta is 25 ℃, and for convenience of resistance value selection in the later temperature compensation fitting resistor array, the sum of the parallel resistance values of the resistor R1 and the temperature compensation fitting resistor array is only preset to be 220K. According to the target value of the fitting target curve of fig. 4, the resistance value ranges of the positive temperature coefficient thermistor PTC and the negative temperature coefficient thermistor NTC are set to 50K to 100K, the temperature coefficient value range is 1000ppm to 5000ppm, the maximum number of devices of the positive temperature coefficient thermistor PTC or the negative temperature coefficient thermistor NTC is 2, the temperature coefficient mode is linear, and the fitting is performed by using a minimum approximation fitting algorithm. Finally, the optimal PTC and NTC schemes are combined: 1 PTC resistor with 100K resistance value of 3000PPM and 1 NTC resistor with 200K resistance value of 3000 PPM. The resistance values can be fitted in a temperature range of-50 ℃ to 100 ℃ after the linear piezoresistors are connected in parallel as shown in figure 5, the fitting deviation is 1.1 percent, and the maximum comprehensive theoretical deviation at the limiting temperature is 3.4 percent.
According to the characteristic curve of the current transmission ratio CTR-temperature of the batch, no obvious inflection point exists, and the resistance does not need to be adjusted in a fitting mode, namely the resistance of the optical coupler output connection is determined to be 2K only by determining the resistance R2 according to the direct current output current Ic and the current transmission ratio CTR. Considering the device production and the comprehensive precision error, the resistor R1 is determined to be 150K omega.
The embodiment of the invention for the switching value signal processing is a typical mode, and the solution method based on the inventive concept by the person skilled in the art is within the protection scope of the invention.
Claims (3)
1. A temperature self-compensating switching value signal processing method is characterized by comprising the following steps:
firstly, acquiring Current Transmission Ratio (CTR) data of an environment temperature Ta of one batch of optical couplers at 25 ℃, drawing a Current Transmission Ratio (CTR) -temperature characteristic curve, and determining a Current Transmission Ratio (CTR) distribution area of the batch of optical couplers;
step two, obtaining a fitting target curve according to the principle of an average Current Transmission Ratio (CTR) distribution area;
fitting by adopting a minimum approximation fitting algorithm, and determining the quantity and the resistance value of a positive temperature coefficient thermistor (PTC) and a negative temperature coefficient thermistor (NTC) in a temperature compensation fitting resistor array connected to the input end of the optical coupling luminotron;
and determining the quantity and the resistance value of the positive temperature coefficient thermistor PTC and the negative temperature coefficient thermistor NTC in the adjusting fitting resistor array connected to the output end of the optocoupler according to the inflection point of the current transmission ratio CTR-temperature characteristic curve.
2. The method as claimed in claim 1, wherein the distribution region of the current transfer ratio CTR in the first step is a cross-wrapping region of two current transfer ratio CTR-temperature characteristic limit curves.
3. The temperature self-compensating switching value signal processing method according to claim 1, wherein the fitted target curve in the second step is fitted to a characteristic curve of the overall resistance value of the temperature compensation fitted resistor array changing with temperature, and the temperature compensation fitted resistor array can effectively and automatically compensate for the change of the output voltage caused by the influence of the temperature change in the working temperature range of the optical coupler.
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| CN108760069B (en) * | 2018-06-05 | 2020-12-18 | 南京南瑞继保电气有限公司 | Method for processing switching value input 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 |
| CN112583071B (en) * | 2020-11-27 | 2022-08-02 | 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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| US6866391B2 (en) * | 2001-11-14 | 2005-03-15 | Remote Sights, Ltd. | Thermal condensate reducer for optical devices |
| US9913338B2 (en) * | 2010-07-28 | 2018-03-06 | Epistar Corporation | Light-emitting device with temperature compensation |
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| CN200950235Y (en) * | 2006-09-25 | 2007-09-19 | 深圳飞通光电子技术有限公司 | Temperature compensation bias circuit of avalanche photodiode |
| CN104078841A (en) * | 2014-07-08 | 2014-10-01 | 成都新易盛通信技术股份有限公司 | Digital open loop temperature compensation system of optical module laser device |
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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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