Multifunctional cathode protection data recorder

Abstract

The invention relates to the field of pipeline cathode protection, in particular to a multifunctional cathode protection data recorder which comprises a micro signal amplification circuit connected with a test pile terminal of a cathode protection test pile, and an alternating current rectification filter circuit connected with the test pile terminal. The direct current signal filter circuit is connected with the test pile terminal; the analog-to-digital conversion circuit is connected with the micro-signal amplification circuit, the alternating-current rectification filter circuit and the direct-current signal filter circuit; the level conversion circuit is connected with the analog-digital conversion circuit; the RS485 communication circuit is connected with a test pile terminal of the cathode protection test pile; the main processor circuit is connected with the level conversion circuit, the RS485 communication circuit and a test pile terminal of the cathode protection test pile; the method is suitable for various types of cathode protection test piles, measurement deviation caused by insufficient professional ability of field operators can be reduced, the number of field test workers is reduced, the working time is shortened, and a large amount of labor cost is saved.

Description

Technical Field

[0001] The invention relates to the field of pipeline cathodic protection, and in particular to a multifunctional cathodic protection data recorder. Background Art

[0002] The detection data format of existing cathodic protection detection facilities and equipment (cathodic protection data recorder or intelligent test pile) includes: power-on potential, power-off potential, AC voltage, AC and DC current density, etc.; some intelligent test piles also have the function of collecting corrosion rate, etc. The above data can be used to evaluate the cathodic protection effect and the degree of stray current interference; in fact, the management of cathodic protection system facilities requires more detailed test parameters for evaluation and management, including inspection piece test pile potential test data, sacrificial anode operating parameters, solid-state decoupler operating parameters and insulation joint effectiveness, etc., all of which require testing a series of data for evaluation and management.

[0003] However, the existing intelligent potential test piles can only measure and upload data for one type of test device, and cannot integrate and count data from all types of test devices; the existing detection requires constantly changing the connection method according to different test pile types, connecting different equipment and facilities, and one person cannot complete all the detection work; and the existing manual data collection requires a high level of professional and technical level of personnel, and there are many measurement parameters and the procedure is relatively complicated. The measured parameters will have errors due to factors such as human operation and instrument accuracy. If the professional ability of the on-site operator is insufficient, it will also cause measurement deviations; at the same time, the existing manual measurement data must be manually recorded, entered into electronic documents, and then data integration and analysis are performed. Summary of the invention

[0004] The present invention provides a multifunctional cathodic protection data recorder to solve at least one of the above technical problems.

[0005] The technical solution of the present invention to solve the above technical problems is as follows: a multifunctional cathodic protection data recorder, suitable for various types of cathodic protection test piles, including:

[0006] A micro-signal amplifying circuit is connected to the test pile terminal of the cathode protection test pile, and is used to amplify the first analog quantity to be tested signal transmitted from the test pile terminal to obtain the first analog quantity to be tested amplified signal;

[0007] An AC rectifier and filter circuit is connected to the test pile terminal and is used to perform rectification and filtering processing on the second analog quantity to be measured signal transmitted from the test pile terminal to obtain a second analog quantity to be measured rectifier and filter signal;

[0008] A DC signal filtering circuit is connected to the test pile terminal and is used to filter the third analog quantity to be measured signal transmitted from the test pile terminal to obtain a third analog quantity to be measured filtered signal;

[0009] an analog-to-digital conversion circuit, connected to the micro-signal amplifying circuit, the AC rectifying and filtering circuit, and the DC signal filtering circuit, for performing analog-to-digital conversion on the first analog quantity amplified signal to be measured, the second analog quantity rectified and filtered signal to be measured, and the third analog quantity filtered signal to be measured, respectively, to obtain a first digital signal, a second digital signal, and a third digital signal accordingly;

[0010] a level conversion circuit connected to the analog-to-digital conversion circuit, and configured to perform level conversion on the first digital signal, the second digital signal, and the third digital signal, respectively, to obtain a first digital level conversion signal, a second digital level conversion signal, and a third digital level conversion signal, respectively;

[0011] An RS485 communication circuit is connected to the test pile terminal of the cathodic protection test pile, and is used to collect and transmit sensor data output by the corrosion rate sensor connected to the test pile terminal;

[0012] A main processor circuit is connected to the level conversion circuit, the RS485 communication circuit and the test pile terminal of the cathode protection test pile, and is used to process the first digital level conversion signal, the second digital level conversion signal, the third digital level conversion signal and the sensing data to obtain cathode protection data; it is also used to output a 3.3V SPI signal, and after converting it into a 2.5V SPI signal through the level conversion circuit, it is transmitted to the analog-to-digital conversion circuit to control the analog-to-digital conversion process of the analog-to-digital conversion circuit; it is also used to control the on and off of the test pile terminal and identify the type of the cathode protection test pile;

[0013] A TF card circuit, connected to the main processing circuit, and used for storing the cathodic protection data;

[0014] The power supply circuit is connected to the test pile terminal, the micro-signal amplifying circuit, the AC rectifier and filter circuit, the analog-to-digital conversion circuit, the level conversion circuit, the RS485 communication circuit, the main processor circuit and the TF card circuit, and is used to power the test pile terminal, the micro-signal amplifying circuit, the AC rectifier and filter circuit, the analog-to-digital conversion circuit, the level conversion circuit, the RS485 communication circuit, the main processor circuit and the TF card circuit.

[0015] Based on the above technical solution, the present invention can also be improved as follows.

[0016] Further, the power supply circuit comprises:

[0017] Rechargeable lithium battery;

[0018] A charging circuit, connected to a 20V external power source and the rechargeable lithium battery, for converting the 20V voltage of the external power source into an 8.4V voltage and charging the rechargeable lithium battery;

[0019] A primary linear voltage stabilization circuit, connected to the rechargeable lithium battery and the charging circuit, for performing linear voltage stabilization on the 8.4V voltage output by the charging circuit or the voltage output by the rechargeable lithium battery to obtain a 5V voltage;

[0020] A secondary linear voltage stabilization circuit is connected to the primary linear voltage stabilization circuit and is used to perform linear voltage stabilization on the 5V voltage output by the primary linear voltage stabilization circuit to obtain a 3.3V voltage;

[0021] A 5V controllable power supply circuit, connected to the primary linear voltage regulator circuit and the main processor circuit, and used for converting the 5V voltage output by the primary linear voltage regulator circuit into a controllable 5V voltage under the control of the main processor circuit;

[0022] A 5V to isolated ±5V circuit, connected to the 5V controllable power supply circuit, for converting the controllable 5V voltage into an isolated -5V voltage and an isolated +5V voltage;

[0023] A precision 2.5V voltage reference circuit, connected to the 5V to isolated ±5V circuit, for converting the isolated +5V voltage into a 2.5V reference voltage;

[0024] A 5V to 2.5V circuit, connected to the 5V to isolated ±5V circuit, for converting the isolated +5V voltage into a +2.5V voltage;

[0025] A 2.5V to -2.5V circuit, connected to the 5V to 2.5V circuit, for converting the +2.5V voltage into a -2.5V voltage;

[0026] Among them, the 3.3V voltage powers the test pile terminal, the analog-to-digital conversion circuit, the level conversion circuit, the RS485 communication circuit, the TF card circuit and the main processor circuit; the isolated -5V voltage and the isolated +5V voltage power the micro-signal amplification circuit and the AC rectifier and filter circuit; the 2.5V reference voltage powers the analog-to-digital conversion circuit; the +2.5V voltage and the -2.5V voltage power the analog-to-digital conversion circuit and the level conversion circuit.

[0027] Furthermore, the charging circuit uses a chip with model number LTC4002ES8-8.4#PBF as the main chip; the first-level linear voltage regulator circuit uses a chip with model number TPS5405DR as the main chip; the second-level linear voltage regulator circuit uses a chip with model number TLV75733PDBVR as the main chip; the 5V controllable power supply circuit uses an N+P channel MOS tube with model number NCE603S as a controllable element; the 5V to isolated ±5V circuit uses a chip with model number WRA0505S-2WR2 as the main chip; the precision 2.5V voltage reference circuit uses a chip with model number REF192GSZ as the main chip; the 5V to 2.5V circuit uses a chip with model number TLV70225DBVR as the main chip; the 2.5V to -2.5V circuit uses an operational amplifier with model number OP07DD as the main chip.

[0028] Furthermore, the micro signal amplification circuit uses a chip model COS128U as a main control chip.

[0029] Furthermore, the AC rectifier and filter circuit uses an operational amplifier of model OP07DD as a main chip.

[0030] Furthermore, the DC signal filtering circuit includes a TVS tube, a common mode suppression filter and a secondary RC filter which are connected in sequence.

[0031] Furthermore, the analog-to-digital conversion circuit uses a chip with a model number of MS5198T as a main chip; the level conversion circuit uses a chip with a model number of π131U61 as a main chip.

[0032] Furthermore, the RS485 communication circuit uses a chip of model MAX3485ESA as a main chip; and the main processor circuit uses a chip of model STM32L072 as a main chip.

[0033] Furthermore, the TF card circuit is connected to the main processor circuit via an SPI interface.

[0034] Furthermore, the test pile terminal includes a relay and a transistor, the base of the transistor is connected to the main processor circuit, the emitter of the transistor is grounded, and the collector of the transistor is connected to the coil of the relay.

[0035] The beneficial effects of the present invention are as follows: a multifunctional cathodic protection data recorder of the present invention can automatically identify the basic information and types of various types of test piles such as ordinary potential test piles, inspection piece test piles, test piles with corrosion rate probes, sacrificial anode test piles, solid-state decoupler test piles, etc., and automatically measure and collect data according to each type of test pile, and can uniformly and professionally test and manage the ancillary facilities of the entire cathodic protection system, identify all types of existing test piles of the cathodic protection system, automatically collect and store all parameters, use fixed professional management record forms to export data, classify data and summarize, timely grasp the current status of the ancillary facilities of the cathodic protection and the operation of the system, and timely repair and maintain the parts with problems, so as to provide strong support for the integrity of the pipeline corrosion protection system; at the same time, the present invention can reduce the measurement deviation caused by the lack of professional ability of the on-site operators, and the baseline inspection personnel can complete the collection of cathodic protection data without the need to send professional technicians to test separately; moreover, the present invention can reduce the number of on-site test staff and working hours, and can fully and automatically collect relevant data with only one step of operation, and the test time is appropriately selected according to the importance and interference situation, and can be completed by one person, saving a lot of manpower costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a block diagram of the internal circuit structure of a multifunctional cathodic protection data recorder of the present invention;

[0037] Figure 2 It is the structural block diagram of the power supply circuit;

[0038] Figure 3 is the circuit schematic diagram of the charging circuit;

[0039] Figure 4 It is the circuit schematic diagram of a primary linear voltage regulator circuit;

[0040] Figure 5 It is the circuit schematic diagram of the secondary linear voltage regulator circuit;

[0041] Figure 6 This is the circuit schematic diagram of the 5V controllable power supply circuit;

[0042] Figure 7 This is the circuit schematic diagram of the 5V to isolated ±5V circuit;

[0043] Figure 8 This is the circuit schematic diagram of the precision 2.5V voltage reference circuit;

[0044] Fig. 9 This is the circuit schematic diagram of the 5V to 2.5V circuit;

[0045] Fig.10 This is the circuit schematic diagram of the 2.5V to -2.5V circuit;

[0046] Fig.11 This is the circuit schematic diagram of the micro signal amplifier circuit;

[0047] Fig.12 It is the circuit schematic diagram of AC rectifier and filter circuit;

[0048] Fig.13 It is the circuit schematic diagram of the DC signal filtering circuit;

[0049] Fig.14 It is a circuit schematic diagram of an analog-to-digital conversion circuit and a level conversion circuit;

[0050] Fig.15 This is the circuit schematic diagram of the RS485 communication circuit;

[0051] Fig.16 A circuit schematic diagram of a main processor circuit;

[0052] Fig.17 This is the circuit schematic diagram of the TF card circuit;

[0053] Fig.18 This is the circuit schematic diagram of the test pile terminal. DETAILED DESCRIPTION

[0054] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0055] like Figure 1 As shown in the figure, a multifunctional cathodic protection data recorder is suitable for various types of cathodic protection test piles, including:

[0056] A micro-signal amplifying circuit is connected to the test pile terminal of the cathode protection test pile, and is used to amplify the first analog quantity to be tested signal transmitted from the test pile terminal to obtain the first analog quantity to be tested amplified signal;

[0057] An AC rectifier and filter circuit is connected to the test pile terminal and is used to perform rectification and filtering processing on the second analog quantity to be measured signal transmitted from the test pile terminal to obtain a second analog quantity to be measured rectifier and filter signal;

[0058] A DC signal filtering circuit is connected to the test pile terminal and is used to filter the third analog quantity to be measured signal transmitted from the test pile terminal to obtain a third analog quantity to be measured filtered signal;

[0059] an analog-to-digital conversion circuit, connected to the micro-signal amplifying circuit, the AC rectifying and filtering circuit, and the DC signal filtering circuit, for performing analog-to-digital conversion on the first analog quantity amplified signal to be measured, the second analog quantity rectified and filtered signal to be measured, and the third analog quantity filtered signal to be measured, respectively, to obtain a first digital signal, a second digital signal, and a third digital signal accordingly;

[0060] a level conversion circuit connected to the analog-to-digital conversion circuit, and configured to perform level conversion on the first digital signal, the second digital signal, and the third digital signal, respectively, to obtain a first digital level conversion signal, a second digital level conversion signal, and a third digital level conversion signal, respectively;

[0061] An RS485 communication circuit is connected to the test pile terminal of the cathodic protection test pile, and is used to collect and transmit sensor data output by the corrosion rate sensor connected to the test pile terminal;

[0062] A main processor circuit is connected to the level conversion circuit, the RS485 communication circuit and the test pile terminal of the cathode protection test pile, and is used to process the first digital level conversion signal, the second digital level conversion signal, the third digital level conversion signal and the sensing data to obtain cathode protection data; it is also used to output a 3.3V SPI signal, and after converting it into a 2.5V SPI signal through the level conversion circuit, it is transmitted to the analog-to-digital conversion circuit to control the analog-to-digital conversion process of the analog-to-digital conversion circuit; it is also used to control the on and off of the test pile terminal and identify the type of the cathode protection test pile;

[0063] A TF card circuit, connected to the main processing circuit, and used for storing the cathodic protection data;

[0064] The power supply circuit is connected to the test pile terminal, the micro-signal amplifying circuit, the AC rectifier and filter circuit, the analog-to-digital conversion circuit, the level conversion circuit, the RS485 communication circuit, the main processor circuit and the TF card circuit, and is used to power the test pile terminal, the micro-signal amplifying circuit, the AC rectifier and filter circuit, the analog-to-digital conversion circuit, the level conversion circuit, the RS485 communication circuit, the main processor circuit and the TF card circuit.

[0065] The multifunctional cathodic protection data recorder of the present invention can automatically identify the information and types of common test piles, inspection piece test piles, test piles with corrosion rate probes, sacrificial anode test piles, insulating joint test piles and solid-state decoupler test piles, and automatically collect and store all parameters, thereby realizing unified and standardized detection and management of cathodic protection facilities.

[0066] The following is a detailed description of each circuit in a multifunctional cathodic protection data recorder of the present invention.

[0067] In this embodiment: Figure 2 As shown, the power supply circuit includes:

[0068] Rechargeable lithium battery;

[0069] A charging circuit, connected to a 20V external power source and the rechargeable lithium battery, for converting the 20V voltage of the external power source into an 8.4V voltage and charging the rechargeable lithium battery;

[0070] A primary linear voltage stabilization circuit, connected to the rechargeable lithium battery and the charging circuit, for performing linear voltage stabilization on the 8.4V voltage output by the charging circuit or the voltage output by the rechargeable lithium battery to obtain a 5V voltage;

[0071] A secondary linear voltage stabilization circuit is connected to the primary linear voltage stabilization circuit and is used to perform linear voltage stabilization on the 5V voltage output by the primary linear voltage stabilization circuit to obtain a 3.3V voltage;

[0072] A 5V controllable power supply circuit, connected to the primary linear voltage regulator circuit and the main processor circuit, and used for converting the 5V voltage output by the primary linear voltage regulator circuit into a controllable 5V voltage under the control of the main processor circuit;

[0073] A 5V to isolated ±5V circuit, connected to the 5V controllable power supply circuit, for converting the controllable 5V voltage into an isolated -5V voltage and an isolated +5V voltage;

[0074] A precision 2.5V voltage reference circuit, connected to the 5V to isolated ±5V circuit, for converting the isolated +5V voltage into a 2.5V reference voltage;

[0075] A 5V to 2.5V circuit, connected to the 5V to isolated ±5V circuit, for converting the isolated +5V voltage into a +2.5V voltage;

[0076] A 2.5V to -2.5V circuit, connected to the 5V to 2.5V circuit, for converting the +2.5V voltage into a -2.5V voltage;

[0077] Among them, the 3.3V voltage powers the test pile terminal, the analog-to-digital conversion circuit, the level conversion circuit, the RS485 communication circuit, the TF card circuit and the main processor circuit; the isolated -5V voltage and the isolated +5V voltage power the micro-signal amplification circuit and the AC rectifier and filter circuit; the 2.5V reference voltage powers the analog-to-digital conversion circuit; the +2.5V voltage and the -2.5V voltage power the analog-to-digital conversion circuit and the level conversion circuit.

[0078] In the power supply circuit: 20V power input, converted into 8.4V power output by the charging circuit to charge the 7.4V rechargeable lithium battery, and used as power supply for the first-level linear voltage regulator circuit. If not charging, the rechargeable lithium battery will be used as power supply for the first-level linear voltage regulator circuit, and the output of the first-level linear voltage regulator circuit is 5V voltage; 5V voltage generates 3.3V voltage through the second-level linear voltage regulator circuit to power the main processor circuit, etc.; 5V voltage is converted into controllable 5V voltage through the 5V controllable power supply circuit, and its control signal is sent to the main processor circuit. After the measurement is completed, the processor circuit sends a control signal to cut off the controllable 5V signal to reduce power consumption and enter a low-power sleep state; the controllable 5V voltage is converted into isolated ±5V two-way voltage through the 5V to isolated ±5V circuit; the isolated +5V voltage is converted into +2.5V voltage output through the 5V to 2.5V circuit; the isolated +5V voltage is converted into 2.5V reference voltage through the precision 2.5V voltage reference circuit. The +2.5V power supply is converted into -2.5V voltage through the "2.5V to -2.5V circuit". The power supply circuit provides various power supplies for the main functional circuits.

[0079] Preferably, Figure 3 The schematic diagram of the charging circuit is shown in FIG. 1 . The charging circuit uses a chip of model LTC4002ES8-8.4#PBF as the main chip. Figure 3 In the figure, VBAT represents the connected rechargeable lithium battery.

[0080] Preferably, Figure 4 The schematic diagram of the circuit of the primary linear voltage regulator circuit is shown in FIG. 1 . The primary linear voltage regulator circuit adopts a chip of model TPS5405DR as the main chip. Figure 4 In the figure, VCC5V represents the 5V voltage output by the first-stage linear voltage regulator circuit.

[0081] Preferably, Figure 5 The schematic diagram of the circuit of the secondary linear voltage regulator circuit is shown in FIG. 1 . The secondary linear voltage regulator circuit adopts a chip of model TLV75733PDBVR as the main chip. Figure 5 In the figure, D+3.3V represents the 3.3V voltage output by the secondary linear voltage regulator circuit.

[0082] Preferably, Figure 6 The circuit schematic diagram of a 5V controllable power supply circuit; the 5V controllable power supply circuit adopts an N+P channel MOS tube of model NCE603S as a controllable element; the main function of the 5V controllable power supply circuit is to be controlled by a control signal PWR_AD issued by a main processor circuit to convert VCC5V into a controllable 5V voltage; Figure 6 In the figure, VCC-AD represents the controllable 5V voltage output by the 5V controllable power supply circuit.

[0083] Preferably, Figure 7 The circuit schematic diagram of a 5V to isolated ±5V circuit is shown below. The 5V to isolated ±5V circuit uses a chip model WRA0505S-2WR2 as the main chip. Figure 7 In the figure, ACC1_+5V represents the isolated +5V voltage output by the 5V to isolated ±5V circuit, and ACC1_-5V represents the isolated -5V voltage output by the 5V to isolated ±5V circuit.

[0084] Preferably, Figure 8 The circuit schematic diagram of the precision 2.5V voltage reference circuit is shown in FIG. 1 ; the precision 2.5V voltage reference circuit uses a chip model REF192GSZ as the main chip; Figure 8 In FIG. 1 , AD1-REF represents the 2.5V reference voltage output by the precision 2.5V voltage reference circuit, which mainly provides an accurate reference for the analog-to-digital conversion circuit.

[0085] Preferably, Fig. 9 The circuit schematic diagram of a 5V to 2.5V circuit; the 5V to 2.5V circuit uses a chip model TLV70225DBVR as the main chip; Fig. 9 In the figure, A1+2.5V represents the +2.5V voltage output by the 5V to 2.5V converter.

[0086] In the power supply circuit of the present invention: the rechargeable design makes the cost lower and the use more convenient; the isolated power supply design separates the analog and digital grounds, and the signal is not easily interfered; the multi-stage linear voltage stabilization design is adopted, the ripple is smaller, and the measurement data is more accurate.

[0087] Preferably, Fig.10 The schematic diagram of the circuit of 2.5V to -2.5V circuit; the 2.5V to -2.5V circuit adopts the operational amplifier of model OP07DD as the main chip; Fig.10 In FIG. 1 , A1-2.5V represents the -2.5V voltage output by the 2.5V to -2.5V circuit.

[0088] In this embodiment, Fig.11The schematic diagram of the micro signal amplifier circuit is shown in FIG. 1 . The micro signal amplifier circuit uses a chip of model COS128U as the main control chip. The main function of the micro signal amplifier circuit is to amplify and filter the first analog signal to be measured; wherein the first analog signal to be measured is a current signal, such as the FL+ signal and the FL- signal in the solid-state decoupler.

[0089] In this embodiment, Fig.12 The circuit schematic diagram of the AC rectifier and filter circuit is shown in FIG. 1 . The AC rectifier and filter circuit uses an operational amplifier of model OP07DD as the main chip. The main function of the AC rectifier and filter circuit is to convert the second analog signal to be measured into a DC voltage signal. The second analog signal to be measured is an AC voltage signal, such as an AC voltage signal in an inner or outer pipe.

[0090] In this embodiment, Fig.13 The circuit schematic diagram of the DC signal filter circuit is shown in FIG. 1 . The DC signal filter circuit includes a TVS tube SMBJ200CA, a common mode suppression filter YLM7060-701T and a secondary RC filter connected in sequence. The DC signal filter circuit mainly filters the third analog signal to be measured; wherein the third analog signal to be measured is a DC voltage signal, such as a pipeline voltage, a check piece potential, an anode open circuit voltage and other DC voltage signals.

[0091] In this embodiment, Fig.14 It is a circuit schematic diagram of an analog-to-digital conversion circuit and a level conversion circuit; the analog-to-digital conversion circuit uses a chip of model MS5198T as a main chip; the level conversion circuit uses a chip of model π131U61 as a main chip.

[0092] The present invention uses a 24-bit high-precision analog-to-digital conversion circuit and a precise 2.5V voltage reference, so that signal measurement is more accurate.

[0093] Because the voltage level of the main processor circuit is 3.3V, and the digital signal after conversion by the analog-to-digital conversion circuit is 2.5V, the present invention requires a level conversion circuit to perform conversion to ensure that data can be transmitted normally between the analog-to-digital conversion circuit and the main processor circuit.

[0094] In this embodiment, Fig.15 The circuit schematic diagram of the RS485 communication circuit is shown in FIG. 1 , wherein the RS485 communication circuit uses a chip of model MAX3485ESA as a main chip. The main processor circuit collects data through the RS485 communication circuit and the corrosion rate sensor connected to the test pile terminal.

[0095] The present invention uses the RS485 bus to connect the corrosion rate sensor, which makes sensor expansion more convenient.

[0096] In this embodiment, Fig.16 The main processor circuit adopts the STM32L072 chip as the main chip.

[0097] The main processor circuit exchanges data with the test pile terminal through the I2C interface to write and automatically identify the type of the test pile.

[0098] The main processor circuit converts its 3.3V SPI signal into the 2.5V SPI signal required by the analog-to-digital conversion circuit through the level conversion circuit, thereby controlling the analog-to-digital conversion circuit to convert the analog signal into a digital signal, completing the data collection of analog test signals such as internal and external pipelines, inspection pieces, references, sacrificial anodes, and solid-state decouplers.

[0099] The main processor circuit stores and records the processed data into the TF card through the SPI interface, and the user can view the data through the TF card.

[0100] In this embodiment, Fig.17 The circuit diagram of the TF card circuit is shown in Figure 1. The TF card circuit is connected to the main processor circuit via an SPI interface, and the connecting line is pulled up by a 47K resistor. The present invention uses a TF card to store data, and stores it in a table form, making it more convenient to export data.

[0101] In this embodiment, Fig.18 The circuit schematic diagram of the test pile terminal; the test pile terminal includes a relay RL1 and a transistor Q1, the base of the transistor Q1 is connected to the main processor circuit, the emitter of the transistor Q1 is grounded, and the collector of the transistor Q1 is connected to the coil of the relay RL1. In addition, the test pile terminal also includes an EEPROM chip AT24C02C.

[0102] The main processor circuit controls the on and off of the transistor Q1 in the test pile terminal through the IO control signal to realize the connection and disconnection of the pipeline and the inspection piece. The test pile terminal connects the analog test signals (and the first analog test signal, the second analog test signal, and the third analog test signal) such as the internal and external pipelines, the inspection piece, the reference, the sacrificial anode, and the solid-state decoupler to the micro-signal amplification circuit, the AC rectifier filter circuit, and the DC signal filter circuit of the multi-function data recorder through the aviation connector.

[0103] The present invention is applicable to the automatic identification, automatic measurement and data recording functions of parameters of all types of cathodic protection test piles (ordinary potential test piles, inspection piece test piles, test piles with corrosion rate probes, sacrificial anode test piles, solid-state decoupler test piles). It is applicable to the testing, operation, maintenance and management of cathodic protection systems of all buried metal pipelines or other metal structures. It has low professional requirements for detection personnel. Automatic identification and measurement can be performed by plugging in the test wiring, reducing the number of operators and measurement time, and greatly improving the efficiency of cathodic protection maintenance work. It is an essential detection tool for cathodic protection detection and operation management personnel.

[0104] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A multifunctional cathodic protection data recorder, characterized in that: Suitable for many types of cathodic protection test piles, including: A micro-signal amplifying circuit is connected to the test pile terminal of the cathode protection test pile, and is used to amplify the first analog quantity to be tested signal transmitted from the test pile terminal to obtain the first analog quantity to be tested amplified signal; An AC rectifier and filter circuit is connected to the test pile terminal and is used to perform rectification and filtering processing on the second analog quantity to be measured signal transmitted from the test pile terminal to obtain a second analog quantity to be measured rectifier and filter signal; A DC signal filtering circuit is connected to the test pile terminal and is used to filter the third analog quantity to be measured signal transmitted from the test pile terminal to obtain a third analog quantity to be measured filtered signal; an analog-to-digital conversion circuit, connected to the micro-signal amplifying circuit, the AC rectifying and filtering circuit, and the DC signal filtering circuit, for performing analog-to-digital conversion on the first analog quantity amplified signal to be measured, the second analog quantity rectified and filtered signal to be measured, and the third analog quantity filtered signal to be measured, respectively, to obtain a first digital signal, a second digital signal, and a third digital signal accordingly; a level conversion circuit connected to the analog-to-digital conversion circuit, and configured to perform level conversion on the first digital signal, the second digital signal, and the third digital signal, respectively, to obtain a first digital level conversion signal, a second digital level conversion signal, and a third digital level conversion signal, respectively; An RS485 communication circuit is connected to the test pile terminal of the cathodic protection test pile, and is used to collect and transmit sensor data output by the corrosion rate sensor connected to the test pile terminal; A main processor circuit is connected to the level conversion circuit, the RS485 communication circuit and the test pile terminal of the cathode protection test pile, and is used to process the first digital level conversion signal, the second digital level conversion signal, the third digital level conversion signal and the sensing data to obtain cathode protection data; it is also used to output a 3.3V SPI signal, and after converting it into a 2.5V SPI signal through the level conversion circuit, it is transmitted to the analog-to-digital conversion circuit to control the analog-to-digital conversion process of the analog-to-digital conversion circuit; it is also used to control the on and off of the test pile terminal and identify the type of the cathode protection test pile; A TF card circuit, connected to the main processing circuit, and used to store the cathodic protection data; The power supply circuit is connected to the test pile terminal, the micro-signal amplifying circuit, the AC rectifier and filter circuit, the analog-to-digital conversion circuit, the level conversion circuit, the RS485 communication circuit, the main processor circuit and the TF card circuit, and is used to power the test pile terminal, the micro-signal amplifying circuit, the AC rectifier and filter circuit, the analog-to-digital conversion circuit, the level conversion circuit, the RS485 communication circuit, the main processor circuit and the TF card circuit.

2. The multifunctional cathodic protection data recorder according to claim 1, characterized in that: The power supply circuit comprises: Rechargeable lithium battery; A charging circuit, connected to a 20V external power source and the rechargeable lithium battery, for converting the 20V voltage of the external power source into an 8.4V voltage and charging the rechargeable lithium battery; A primary linear voltage stabilization circuit, connected to the rechargeable lithium battery and the charging circuit, for performing linear voltage stabilization on the 8.4V voltage output by the charging circuit or the voltage output by the rechargeable lithium battery to obtain a 5V voltage; A secondary linear voltage stabilization circuit is connected to the primary linear voltage stabilization circuit and is used to perform linear stabilization on the 5V voltage output by the primary linear voltage stabilization circuit to obtain a 3.3V voltage; A 5V controllable power supply circuit, connected to the primary linear voltage regulator circuit and the main processor circuit, and used for converting the 5V voltage output by the primary linear voltage regulator circuit into a controllable 5V voltage under the control of the main processor circuit; A 5V to isolated ±5V circuit, connected to the 5V controllable power supply circuit, for converting the controllable 5V voltage into an isolated -5V voltage and an isolated +5V voltage; A precision 2.5V voltage reference circuit, connected to the 5V to isolated ±5V circuit, for converting the isolated +5V voltage into a 2.5V reference voltage; A 5V to 2.5V circuit, connected to the 5V to isolated ±5V circuit, for converting the isolated +5V voltage into a +2.5V voltage; A 2.5V to -2.5V circuit, connected to the 5V to 2.5V circuit, for converting the +2.5V voltage into a -2.5V voltage; Among them, the 3.3V voltage powers the test pile terminal, the analog-to-digital conversion circuit, the level conversion circuit, the RS485 communication circuit, the TF card circuit and the main processor circuit; the isolated -5V voltage and the isolated +5V voltage power the micro-signal amplification circuit and the AC rectifier and filter circuit; the 2.5V reference voltage powers the analog-to-digital conversion circuit; the +2.5V voltage and the -2.5V voltage power the analog-to-digital conversion circuit and the level conversion circuit.

3. The multifunctional cathodic protection data recorder according to claim 2, characterized in that: The charging circuit uses a chip with model number LTC4002ES8-8.4#PBF as the main chip; the first-level linear voltage regulator circuit uses a chip with model number TPS5405DR as the main chip; the second-level linear voltage regulator circuit uses a chip with model number TLV75733PDBVR as the main chip; the 5V controllable power supply circuit uses an N+P channel MOS tube with model number NCE603S as a controllable element; the 5V to isolated ±5V circuit uses a chip with model number WRA0505S-2WR2 as the main chip; the precision 2.5V voltage reference circuit uses a chip with model number REF192GSZ as the main chip; the 5V to 2.5V circuit uses a chip with model number TLV70225DBVR as the main chip; the 2.5V to -2.5V circuit uses an operational amplifier with model number OP07DD as the main chip.

4. The multifunctional cathodic protection data recorder according to claim 1, characterized in that: The micro signal amplification circuit uses a chip with model number COS128U as the main control chip.

5. The multifunctional cathodic protection data recorder according to claim 1, characterized in that: The AC rectifier and filter circuit uses an operational amplifier of model OP07DD as a main chip.

6. The multifunctional cathodic protection data recorder according to claim 1, characterized in that: The DC signal filtering circuit comprises a TVS tube, a common mode suppression filter and a secondary RC filter which are connected in sequence.

7. The multifunctional cathodic protection data recorder according to claim 1, characterized in that: The analog-to-digital conversion circuit uses a chip with a model number of MS5198T as a main chip; the level conversion circuit uses a chip with a model number of π131U61 as a main chip.

8. The multifunctional cathodic protection data recorder according to claim 1, characterized in that: The RS485 communication circuit uses a chip with the model number MAX3485ESA as the main chip; the main processor circuit uses a chip with the model number STM32L072 as the main chip.

9. The multifunctional cathodic protection data recorder according to claim 1, characterized in that: The TF card circuit is connected to the main processor circuit via an SPI interface.

10. The multifunctional cathodic protection data recorder according to claim 1, characterized in that: The test pile terminal includes a relay and a transistor, the base of the transistor is connected to the main processor circuit, the emitter of the transistor is grounded, and the collector of the transistor is connected to the coil of the relay.

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