CN217278703U - Cable thermal ageing case temperature control system - Google Patents
Cable thermal ageing case temperature control system Download PDFInfo
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- CN217278703U CN217278703U CN202220280897.8U CN202220280897U CN217278703U CN 217278703 U CN217278703 U CN 217278703U CN 202220280897 U CN202220280897 U CN 202220280897U CN 217278703 U CN217278703 U CN 217278703U
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Abstract
The utility model discloses a cable thermal ageing oven temperature control system, which comprises a temperature sensor, a signal processing unit and a microprocessor, wherein the signal processing unit comprises a low-pass noise reduction circuit, an amplification regulating circuit and an LC filter circuit which are connected in sequence; the utility model discloses low pass noise reduction circuit adopts RC filter network to fall the noise to the detected signal, utilizes dual RC to fall the noise and can effectively reduce because of electromagnetic interference to the influence of detected signal, promotes the detected signal precision; the amplification regulating circuit effectively inhibits temperature drift interference through thermal noise elimination in the operational amplification process, and improves the amplification accuracy of detection signals; the LC filter circuit utilizes the principle of the pi-type LC filter to further accurately filter the detection signal, eliminates the internal noise of the system, effectively improves the output precision of the detection signal, and ensures that the temperature detection result is accurate and effective, thereby effectively improving the effectiveness of temperature control adjustment of the cable thermal ageing oven.
Description
Technical Field
The utility model relates to a cable thermal ageing case technical field especially relates to a cable thermal ageing case temperature control system.
Background
The cable thermal aging box is used for researching initiation, growth mechanism and inhibition methods of an electric tree, a water tree and the like in cable insulation by a cable insulation accelerated aging method, and has very important practical significance for cable service life evaluation, insulation aging on-line monitoring and the like. Place the experimental sample in the liquid groove of cable heat-aging box, through setting for different temperature and humidity, can pour into water or chemical solution in the liquid groove to exert different voltages for the experimental sample through the pressure components, thereby research experimental sample is at the ageing condition under single factor or the multifactor simultaneous action such as electricity, heat and chemistry. The temperature sensor is influenced by complex and changeable test environment, so that the thermistor temperature sensor is easy to generate temperature drift in the detection process to cause signal imbalance, the temperature control linearity is poor, errors are easy to occur, and the accuracy of a test result is influenced.
So the utility model provides a new scheme to solve the problem.
SUMMERY OF THE UTILITY MODEL
To the above situation, in order to overcome the defects of the prior art, an object of the present invention is to provide a temperature control system for a cable thermal aging box.
The technical scheme for solving the problem is as follows: the utility model provides a cable thermal ageing case temperature control system, includes temperature sensor, signal processing unit and microprocessor, the signal processing unit is including the low pass that connects gradually fall the noise circuit, enlarge regulating circuit and LC filter circuit, the input of low pass falls the noise circuit is connected temperature sensor's signal output part, LC filter circuit's output passes through the AD converter and connects microprocessor.
Preferably, the low-pass noise reduction circuit comprises a resistor R1, one end of a resistor R1 is connected with one end of a resistor R2, one end of a capacitor C1 and a signal output end of the temperature sensor, the other ends of the resistor R1 and the capacitor C1 are grounded in parallel, the other end of the resistor R2 is connected with one end of the resistor R3 through a capacitor C2, and the other end of the resistor R3 is grounded.
Preferably, the amplification regulating circuit includes an operational amplifier AR1, a non-inverting input terminal of the operational amplifier AR1 is connected to the other end of the resistor R2, an inverting input terminal of the operational amplifier AR1 is connected to one end of the resistor R4 and the capacitor C3, the other end of the capacitor C3 is grounded through the resistor R5, and the other end of the resistor R4 is connected to an output terminal of the operational amplifier AR 1.
Preferably, the LC filter circuit includes capacitors C4 and C5 and an inductor L1, one end of the inductor L1 and one end of the capacitor C4 are connected to the output end of the operational amplifier AR1, the other end of the inductor L1 is connected to one end of the capacitor C5 and the a/D converter, and the other ends of the capacitors C4 and C5 are grounded.
Preferably, the temperature sensor is a Pt100 platinum thermistor.
Through the technical scheme, the beneficial effects of the utility model are that:
1. the utility model discloses low pass noise reduction circuit adopts RC filter network to fall the noise to the detected signal, utilizes dual RC to fall the noise and can effectively reduce because of electromagnetic interference to the influence of detected signal, promotes the detected signal precision;
2. the amplification regulating circuit effectively inhibits temperature drift interference through thermal noise elimination in the operational amplification process, and improves the amplification accuracy of detection signals;
and 3, the LC filter circuit utilizes the principle of a pi-type LC filter to further accurately filter the detection signal, eliminates the internal noise of the system, effectively improves the output precision of the detection signal, and ensures that the temperature detection result is accurate and effective, thereby effectively improving the effectiveness of temperature control adjustment of the cable thermal ageing box.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Detailed Description
The foregoing and other technical matters, features and effects of the present invention will be apparent from the following detailed description of the embodiments, which is to be read in connection with the accompanying fig. 1. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.
Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
The utility model provides a cable thermal ageing case temperature control system, includes temperature sensor, signal processing unit and microprocessor, and the signal processing unit is including the low pass that connects gradually and is fallen circuit, enlarged regulating circuit and LC filter circuit, the input of low pass falls the circuit of making an uproar and connects temperature sensor's signal output part, LC filter circuit's output passes through the AD converter and connects microprocessor.
As shown in fig. 1, the low-pass noise reduction circuit includes a resistor R1, one end of a resistor R1 is connected to one end of a resistor R2, one end of a capacitor C1 and a signal output end of the temperature sensor, the other ends of the resistor R1 and the capacitor C1 are grounded in parallel, the other end of the resistor R2 is connected to one end of the resistor R3 through a capacitor C2, and the other end of the resistor R3 is grounded.
The amplifying and adjusting circuit comprises an operational amplifier AR1, wherein the non-inverting input end of the operational amplifier AR1 is connected with the other end of the resistor R2, the inverting input end of the operational amplifier AR1 is connected with one end of the resistor R4 and one end of the capacitor C3, the other end of the capacitor C3 is grounded through the resistor R5, and the other end of the resistor R4 is connected with the output end of the operational amplifier AR 1.
The LC filter circuit comprises capacitors C4 and C5 and an inductor L1, one ends of the inductor L1 and the capacitor C4 are connected with the output end of the operational amplifier AR1, the other end of the inductor L1 is connected with one end of the capacitor C5 and the A/D converter, and the other ends of the capacitors C4 and C5 are grounded.
When the utility model is used in concrete, the temperature sensor selects the Pt100 platinum thermal resistor to detect the temperature in the cable thermal aging box, and in order to ensure the accuracy of the temperature detection result, the detection signal is sent into the signal processing unit to be processed; firstly, the low-pass noise reduction circuit adopts an RC filter network to reduce noise of a detection signal, and the influence of electromagnetic interference on the detection signal can be effectively reduced by utilizing dual RC noise reduction, so that the precision of the detection signal is improved; the amplification regulating circuit utilizes an operational amplifier AR1 to perform operational amplification processing on the RC noise-reduced and filtered signals, and a capacitor C3 eliminates thermal noise on a resistor R5 loop in the operational amplification process, so that temperature drift interference is effectively inhibited, and the amplification accuracy of detection signals is improved; then, the LC filter circuit further accurately filters the detection signal by utilizing the principle of a pi-type LC filter, eliminates the internal noise of the system and effectively improves the output precision of the detection signal; and finally, the analog detection signal quantity is converted into a digital quantity signal by the A/D converter and is sent into the microprocessor, the real-time temperature in the cable thermal ageing oven is calculated through the internal operation processing of the microprocessor, the temperature detection result is accurate and effective, and therefore the effectiveness of the temperature control regulation of the cable thermal ageing oven can be effectively improved.
The above description is provided for further details of the present invention with reference to the specific embodiments, which should not be construed as limiting the present invention; to the utility model discloses affiliated and relevant technical field's technical personnel are based on the utility model discloses under the technical scheme thinking prerequisite, the extension of doing and the replacement of operating method, data all should fall within the utility model discloses within the protection scope.
Claims (5)
1. The utility model provides a cable thermal ageing case temperature control system, includes temperature sensor, signal processing unit and microprocessor, its characterized in that: the signal processing unit comprises a low-pass noise reduction circuit, an amplification regulating circuit and an LC filter circuit which are sequentially connected, the input end of the low-pass noise reduction circuit is connected with the signal output end of the temperature sensor, and the output end of the LC filter circuit is connected with the microprocessor through an A/D converter.
2. The cable thermal aging box temperature control system according to claim 1, characterized in that: the low-pass noise reduction circuit comprises a resistor R1, one end of a resistor R1 is connected with one end of a resistor R2, one end of a capacitor C1 and the signal output end of the temperature sensor, the other ends of the resistor R1 and the capacitor C1 are grounded in parallel, the other end of a resistor R2 is connected with one end of a resistor R3 through a capacitor C2, and the other end of a resistor R3 is grounded.
3. The cable thermal aging box temperature control system according to claim 2, characterized in that: the amplifying and adjusting circuit comprises an operational amplifier AR1, wherein the non-inverting input end of the operational amplifier AR1 is connected with the other end of a resistor R2, the inverting input end of the operational amplifier AR1 is connected with one end of a resistor R4 and one end of a capacitor C3, the other end of the capacitor C3 is grounded through a resistor R5, and the other end of the resistor R4 is connected with the output end of an operational amplifier AR 1.
4. The cable thermal aging box temperature control system according to claim 3, characterized in that: the LC filter circuit comprises capacitors C4 and C5 and an inductor L1, one ends of the inductor L1 and the capacitor C4 are connected with the output end of the operational amplifier AR1, the other end of the inductor L1 is connected with one end of the capacitor C5 and the A/D converter, and the other ends of the capacitors C4 and C5 are grounded.
5. The cable thermal aging box temperature control system according to any one of claims 1 to 4, characterized in that: the temperature sensor adopts a Pt100 platinum thermal resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220280897.8U CN217278703U (en) | 2022-02-11 | 2022-02-11 | Cable thermal ageing case temperature control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220280897.8U CN217278703U (en) | 2022-02-11 | 2022-02-11 | Cable thermal ageing case temperature control system |
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| CN217278703U true CN217278703U (en) | 2022-08-23 |
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| CN202220280897.8U Active CN217278703U (en) | 2022-02-11 | 2022-02-11 | Cable thermal ageing case temperature control system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115494900A (en) * | 2022-09-22 | 2022-12-20 | 上海概伦电子股份有限公司 | Reference voltage extension method, system, device, and computer-readable storage medium |
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2022
- 2022-02-11 CN CN202220280897.8U patent/CN217278703U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115494900A (en) * | 2022-09-22 | 2022-12-20 | 上海概伦电子股份有限公司 | Reference voltage extension method, system, device, and computer-readable storage medium |
| CN115494900B (en) * | 2022-09-22 | 2024-02-06 | 上海概伦电子股份有限公司 | Reference voltage expansion method, system, apparatus, and computer-readable storage medium |
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