Cathode protection ultra-low voltage frequency conversion control circuit

Abstract

The invention discloses a cathode protection ultra-low voltage frequency conversion control circuit which comprises a data acquisition circuit, a communication circuit, a constant-current constant-voltage circuit and a power supply management circuit which are connected with the control circuit. The data acquisition module can acquire the potential related parameters of the protected cathode metal and send the potential related parameters to the external server, and the external server obtains the control parameters according to the potential related parameters and the relation between the preset potential related parameters and the control parameters. And the control circuit receives the control parameters and sends the control parameters to the communication circuit of the corresponding potentiometer, then controls the constant-current and constant-voltage circuit to output current and voltage according to the control parameters, and finally controls the potential of the protected cathode metal to be in a preset cathode protection potential interval.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of metal corrosion protection, in particular to a cathodic protection ultra-low voltage variable frequency control circuit. BACKGROUND

[0002] Impressed current cathodic protection, also known as forced current cathodic protection. Impressed current cathodic protection is to change the potential of the surrounding environment by an external power supply, so that the potential of the equipment and pipeline to be protected is always lower than that of the surrounding environment, so as to become the cathode in the whole environment. Thus, the equipment to be protected will not corrode due to the loss of electrons.

[0003] At present, the market is all separate individual cathodic protection data acquisition equipment, separate constant potential shift protection device or sacrificial anode protection equipment, and the equipment only acquires data or cathodic protection device. The construction of the voltage regulation station is too high in cost, difficult to construct, cannot realize automatic adjustment, and will bring trouble to installation and maintenance, and cannot realize cathodic protection data acquisition and automatic adjustment of cathodic protection potential. SUMMARY

[0004] The present application mainly solves the technical problems existing in the prior art, thereby providing a cathodic protection ultra-low voltage variable frequency control circuit and a control method thereof, which can monitor the potential related parameters of the protected cathodic metal in real time, and can adjust the protected cathodic metal to be in a standard cathodic protection potential interval at any time.

[0005] The above technical problems of the present application are mainly solved by the following technical scheme:

[0006] The cathodic protection ultra-low voltage variable frequency control circuit of the present application comprises the following circuits:

[0007] A data acquisition circuit for acquiring potential related parameters of the protected cathodic metal;

[0008] A control circuit capable of receiving and transmitting the potential related parameters, receiving the control parameters transmitted by an external server, and controlling the constant current and voltage output of the constant current and voltage circuit according to the control parameters, wherein the control parameters are obtained by the external server according to the potential related parameters;

[0009] A communication circuit for sending the potential related parameters to an external server and receiving the control parameters;

[0010] A constant current and voltage circuit for adjusting the potential parameters of the anode bed and realizing the adjustment of the potential of the protected cathodic metal in the preset cathodic protection potential interval;

[0011] A power management circuit for providing power supply to all circuits;

[0012] The data acquisition circuit, the communication circuit, the constant voltage and constant current circuit, and the power management circuit are connected with the control circuit.

[0013] Optionally, the data acquisition circuit comprises a reference circuit and a measured value circuit connected with each other.

[0014] The reference circuit is used for detecting an anode of the protected cathode metal, an alternating current test piece of the protected cathode metal, a self-corrosion test piece of the protected cathode metal, a polarization test piece of the protected cathode metal, and a reference signal between the protected cathode metal and a reference electrode, wherein the reference signal comprises a voltage reference signal and a current reference signal.

[0015] The measured value circuit is used for converting the voltage reference signal into a voltage value signal and converting the current reference signal into a current value signal.

[0016] Optionally, the reference circuit comprises a first relay circuit to an eleventh relay circuit.

[0017] The common port of the first relay circuit is connectable with the anode of the protected cathode metal, the common port of the second relay circuit is connectable with the alternating current test piece of the protected cathode metal, the common port of the third relay circuit is connectable with the self-corrosion test piece of the protected cathode metal, the common port of the fourth relay circuit is connectable with the polarization test piece of the protected cathode metal, the common port of the fifth relay circuit is connectable with the protected cathode metal, and the 11th pin of the eleventh relay circuit is connectable with the reference electrode.

[0018] The normally closed ports of the first relay circuit to the fifth relay circuit are connected with each other; the normally open port of the first relay circuit is connected with the normally open port of the sixth relay circuit, the normally open port of the second relay circuit is connected with the normally open port of the seventh relay circuit, the normally open port of the third relay circuit is connected with the normally open port of the eighth relay circuit, the normally open port of the fourth relay circuit is connected with the normally open port of the ninth relay circuit, the normally closed port of the fifth relay circuit is connected with the normally open port of the tenth relay circuit and the 9th pin of the eleventh relay circuit. The common ports of the sixth relay circuit to the tenth relay circuit are connected with each other and with the 4th pin of the eleventh relay circuit; the 8th pin of the eleventh relay circuit is connected with the measured value circuit, the 9th pin of the eleventh relay circuit is connected with the normally open port of the fifth relay circuit, the 11th pin of the eleventh relay circuit is connected with the reference signal, the 6th pin of the tenth relay circuit is connected with the measured value circuit, and the 13th pin of the eleventh relay circuit is connected with the reference electrode.

[0019] The control end of the first to eleventh relay circuits is connected with the control circuit.

[0020] Optionally, the measurement circuit comprises: The controller U11 is configured to measure the voltage reference signal as a voltage value signal and convert the current reference signal into a current value signal.

[0021] The voltage reference input circuit is configured to transmit the voltage reference signal output by the reference circuit to the controller U11.

[0022] The current reference input circuit is configured to transmit the current reference signal output by the reference circuit to the controller U11.

[0023] The reference circuit is connected with the controller U11 through the voltage reference input circuit and the current reference input circuit.

[0024] Optionally, the voltage reference input circuit comprises a twelfth relay circuit, a first voltage drop circuit, and a second voltage drop circuit.

[0025] The 6-pin of the eleventh relay circuit is connected with the controller U11 through the first voltage drop circuit.

[0026] The 6-pin of the eleventh relay circuit is connected with the common port of the twelfth relay circuit, and the normally open port of the twelfth relay circuit is connected with the controller U11 through the second voltage drop circuit.

[0027] The control end of the twelfth relay circuit is connected with the control circuit.

[0028] Optionally, the current reference input circuit comprises a thirteenth relay circuit, a fourteenth relay circuit, a third voltage drop circuit, a fourth voltage drop circuit, and a fifth voltage drop circuit.

[0029] The 8-pin of the eleventh relay circuit is connected with the common port of the thirteenth relay circuit, the normally closed port of the thirteenth relay circuit is connected with the normally open port of the fourteenth relay circuit through the fifth voltage drop circuit, the normally open port of the thirteenth relay circuit is connected with the controller U11 through the third voltage drop circuit, the fourth voltage drop circuit, and the fifth voltage drop circuit, and the normally closed port of the fourteenth relay circuit is connected with the controller U11 through the fourth voltage drop circuit and the fifth voltage drop circuit.

[0030] The control end of the thirteenth relay circuit and the fourteenth relay circuit is connected with the control circuit.

[0031] The 13-pin of the eleventh relay circuit is also connected with the controller U11.

[0032] Optionally, port 1 of controller U11 is connected to the VPP terminal, and port 1 of controller U11 is also grounded through capacitor C54. Port 2 of controller U11 is connected to port 3 of controller U11 through capacitor C57. Port 4 of controller U11 is grounded through capacitor C60. Port 5 of controller U11 is connected to the VCC terminal. Port 6 of controller U11 is grounded, and port 6 of controller U11 is connected to the VCC terminal through parallel capacitors C55 and C56. Port 7 of controller U11 is grounded through capacitor C62. Port 8 of controller U11 is grounded through capacitor C64. Port 9 of controller U11 is connected to the low battery detection circuit. Port 10 of controller U11 is connected to the first step-down circuit. Port 11 of controller U11 is connected to the second step-down circuit. Port 12 of controller U11 is connected to the second step-down circuit through capacitors C66 and C65 in sequence. The controller U11 is connected as follows: port 13 is connected to the second step-down circuit via capacitor C65; port 14 is connected to port 6 of the eleventh relay circuit via resistor R6 and switch S12; port 15 is connected to the fifth step-down circuit; port 15 is also connected to port 13 of the eleventh relay circuit via a rectifier circuit; port 17 is connected to port 13 of the eleventh relay circuit; port 19 is grounded via switch S1; port 20 is grounded via switch S2; pin 28 is grounded via resistor R100; pin 34 is connected to the indicator light circuit; pins 35 and 36 are both connected to the control circuit; and pins 59, 60, 61, and 62 are connected to the first crystal oscillator circuit.

[0033] Optionally, the control circuit includes a microcontroller U1, and pins 33, 34, 35, 36, 38, 39, 40, 41, 42, 43, 63, 64, 65 and 66 of the microcontroller U1 are connected to the first relay circuit to the fourteenth relay circuit one by one.

[0034] Optionally, port 78 of the microcontroller U1 is connected to port 35 of the controller U11, and port 79 of the microcontroller U1 is connected to port 36 of the controller U11.

[0035] Optionally, the 29th pin, 30th pin, 31st pin and 32nd pin of the microcontroller U1 are in communication with a storage circuit, the 67th pin, 68th pin and 69th pin of the microcontroller U1 are connected with a GPS circuit; the 72nd pin and 76th pin of the microcontroller U1 are connected with a burning circuit, the 86th pin, 87th pin, 93rd pin, 95th pin and 96th pin of the microcontroller U1 are connected with the communication circuit, the 47th pin, 48th pin, 14th pin, 6th pin 50th pin, 75th pin, 100th pin, 28th pin, 11th pin and 44th pin of the microcontroller U1 are connected with a power management circuit, the 51st pin, 52nd pin, 53rd pin, 54th pin, 59th pin, 60th pin, 61st pin of the microcontroller U1 are connected with a display screen circuit, the 12th pin and 13th pin of the microcontroller U1 are connected with a second crystal oscillator circuit, the 49th pin, 74th pin, 99th pin, 27th pin and 10th pin of the microcontroller U1 are grounded, the 15th pin of the microcontroller U1 is connected with a battery power module, the 23rd pin, 80th pin and 83rd pin of the microcontroller U1 are connected with the constant current constant voltage circuit, the 1st pin, 2nd pin, 3rd pin, 4th pin, 5th pin, 97th pin and 98th pin of the microcontroller U1 are connected with a switch circuit.

[0036] In the present disclosure, the data acquisition module can acquire the potential related parameters of the protected cathode metal, transmit the potential related parameters to an external server, and the external server can acquire the control parameters according to the relationship between the potential related parameters and the preset potential related parameters and control parameters, and transmit the control parameters to the communication circuit of the corresponding potential instrument, and the control circuit can control the constant current constant voltage circuit to output the current and voltage according to the control parameters, so as to finally control the potential of the protected cathode metal to be in the preset cathode protection potential interval.

[0037] The present circuit can replace the sacrificial anode method and the forced current method to ensure that the cathode protection potential of the protected unit is in the standard cathode protection potential interval. Both real-time data acquisition and corresponding protection effect on the protected unit are achieved. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0039] Figure 1 is the principle block diagram of the cathode protection ultra-low voltage variable frequency control circuit of the present application; Figure 2 is the circuit of the control circuit in the present application Figure One ; Figure 3 is the circuit of the control circuit in the present applicationFigure Two ; Figure 4 This is the control circuit of the present invention. Figure Three ; Figure 5 This is a circuit diagram of the reference circuit in this invention; Figure 6 This is a circuit diagram of the measurement circuit in this invention; Figure 7 This is the communication circuit of the present disclosure. Figure One ; Figure 8 This is the communication circuit of the present disclosure. Figure Two ; Figure 9 This is the circuit of the constant voltage and constant current circuit disclosed herein. Figure One ; Figure 10 This is the circuit of the constant voltage and constant current circuit disclosed herein. Figure Two ; Figure 11 This is the power management circuit of the present disclosure. Figure One ; Figure 12 This is the power management circuit of the present disclosure. Figure Two ; Figure 13 This is the power management circuit of the present disclosure. Figure Three ; Figure 14 This is the power management circuit of the present disclosure. Figure Four ; Figure 15 There is no circuit diagram for the power management circuit in this disclosure. Detailed Implementation

[0040] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0041] See Figure 1 As shown, the present invention provides a cathodic protection ultra-low voltage frequency conversion control circuit, comprising a data acquisition circuit 1000, a control circuit 2000, a communication circuit 3000, a constant voltage and constant current circuit 4000, and a power management circuit 5000, all connected to the control circuit.

[0042] See Figure 5 , Figure 6 As shown, the data acquisition circuit 1000 is used to acquire potential-related parameters of the protected cathode metal;

[0043] See Figure 2 ,Figure 3 , Figure 4 As shown, the control circuit 2000 can receive and transmit the potential-related parameters, receive the control parameters transmitted from the external server, and control the constant voltage circuit to output control current and voltage according to the control parameters. The control parameters are obtained by the external server based on the potential-related parameters.

[0044] See Figure 7 , Figure 8 As shown, the communication circuit 3000 is used to send potential-related parameters to an external server and receive the control parameters;

[0045] See Figure 9 , Figure 10 As shown, the constant voltage circuit 4000 is used to adjust the potential parameters of the anode ground bed, so as to adjust the potential of the protected cathode metal to be within the preset cathodic protection potential range.

[0046] See Figure 11 , Figure 12 , Figure 13 , Figure 14 , Figure 15 As shown, the power management circuit 5000 is used to provide power to all circuits;

[0047] The data acquisition circuit 1000, communication circuit 3000, constant voltage circuit 4000, and power management circuit 5000 are all connected to the control circuit 2000.

[0048] In one specific embodiment, the data acquisition circuit 1000 includes a reference circuit 1100 and a measurement circuit 1200 that are interconnected.

[0049] See Figure 5 As shown, the reference circuit 1100 is used to detect the anode of the protected cathode metal, the AC test piece of the protected cathode metal, the self-corrosion test piece of the protected cathode metal, the polarization test piece of the protected cathode metal, and the reference signal between the protected cathode metal and the reference terminal. The reference signal includes a voltage reference signal and a current reference signal.

[0050] The measurement circuit 1200 is used to measure the voltage reference signal into a voltage value signal and convert the current reference signal into a current value signal; In one specific embodiment, see Figure 5As shown, the reference circuit 1100 comprises first to eleventh relay circuits (1101-1111), wherein the relays in the first to tenth relay circuits (1101-1110) can adopt HF32F / 005-ZS3 relays; the relay in the eleventh relay circuit 1111 can adopt an HFD27 / 005-S relay;

[0051] The common port of the relay K1 in the first relay circuit 1101 can be connected with the anode of the protected cathode metal for detecting the anode voltage of the protected cathode metal;

[0052] The common port of the relay K2 in the second relay circuit 1102 can be connected with the alternating current coupon of the protected cathode metal for detecting the alternating current coupon voltage of the protected cathode metal;

[0053] The common port of the relay K3 in the third relay circuit 1103 can be connected with the self-corrosion coupon of the protected cathode metal for detecting the self-corrosion coupon voltage;

[0054] The common port of the relay K4 in the fourth relay circuit 1104 can be connected with the polarization coupon of the protected cathode metal for detecting the polarization coupon voltage;

[0055] The common port of the relay K5 in the fifth relay circuit 1106 can be connected with the protected cathode metal for detecting the protected cathode metal voltage;

[0056] The normally closed ports of the relays (K1-K5) in the first to fifth relay circuits (1101-1105) are connected with each other, and in the standby state, each detection line can be connected with each other; the normally open port of the relay K1 in the first relay circuit 1101 is connected with the normally open port of the relay K6 in the sixth relay circuit 1106, the normally open port of the relay K2 in the second relay circuit 1102 is connected with the normally open port of the relay K7 in the seventh relay circuit 1107, the normally open port of the relay K3 in the third relay circuit 1103 is connected with the normally open port of the relay K8 in the eighth relay circuit 1108, the normally open port of the relay K4 in the fourth relay circuit 1104 is connected with the normally open port of the relay K9 in the ninth relay circuit 1109, and the normally open port of the relay K5 in the fifth relay circuit 1105 is connected with the 9-pin of the relay K10 in the eleventh relay circuit 1111 and the normally open port of the relay K10 in the tenth relay circuit 1110;

[0057] The common port of the relays (K5-K10) in the sixth to tenth relay circuits (1106-1110) are connected to each other and to the 4th pin of the relay K11 in the eleventh relay circuit 1111; The first to fifth relay circuits (1101-1105) are used to control the connection or disconnection of the reference circuit 1100 to the anode, AC coupon, self-corrosion coupon, polarization coupon or protected cathode metal, respectively; The sixth to tenth relay circuits (1106-1110) are used to control the connection or disconnection of the signals received by the anode, AC coupon, self-corrosion coupon, polarization coupon or protected cathode metal to the eleventh relay circuit 1111, respectively;

[0058] The 8th pin of the relay K11 in the eleventh relay circuit 1111 is connected to the measurement circuit 1200 for transmitting the current reference signal, the 9th pin of the relay K11 in the eleventh relay circuit 1111 is connected to the normally open port of the relay K5 in the fifth relay circuit 1105, the 11th pin of the relay K11 in the eleventh relay circuit 1111 is connected to the reference signal, the 13th pin of the relay K11 in the eleventh relay circuit 1111 is connected to the measurement circuit 1200 for transmitting the signal of the common measurement terminal, and the 6th pin of the eleventh relay circuit is connected to the measurement circuit for transmitting the voltage reference signal;

[0059] The eleventh relay circuit 1111 is used to compare the signals of the anode, AC coupon, self-corrosion coupon, polarization coupon or protected cathode metal input to the 4th pin of the relay K11 with the reference signal of the 11th pin of the relay K11, and then output the signal from the 6th pin of the relay K11; when measuring the current signal, the 8th pin of the eleventh relay is the current input pin, the 9th pin and the 8th pin are switched by the control Q12 to detect the current between the protected cathode metal (pipe) and each electrode; the 13th pin COM1 of the relay K11 outputs the signal of the common measurement terminal, the 6th pin VIN1 of the relay K11 outputs the voltage reference signal, and the 8th pin Current1 of the relay K11 outputs the current reference signal.

[0060] The control terminals of the first to eleventh relay circuits (1101-1111) are connected to the control circuit 2000. The control circuit 2000 controls the on-off of the first to eleventh relay circuits (1101-1111), thereby controlling the connection or disconnection of the circuit to detect the direct current voltage and current between the anode and the reference, the alternating current voltage and current between the AC coupon and the reference, the direct current voltage and current between the self-corrosion coupon and the reference, the direct current voltage and current between the polarization coupon and the reference, and the direct current voltage and current between the pipe and the reference;

[0061] In another embodiment, referring to Figure 6 The measurement circuit 1200 includes: A controller U11 for converting the voltage reference signal into a voltage value signal and converting the current reference signal into a voltage value signal; A voltage reference input circuit 1210 for transmitting the voltage reference signal output by the reference circuit to the controller U11; A current reference input circuit 1220 for transmitting the current reference signal output by the reference circuit to the controller U11;

[0062] The reference circuit 1100 is connected to the controller U11 through the voltage reference input circuit 1210, and the reference circuit 1100 is connected to the controller U11 through the current reference input circuit 1220.

[0063] In a specific embodiment, the voltage reference input circuit 1210 includes a twelfth relay circuit 1211, a first voltage reduction circuit 1212, and a second voltage reduction circuit 1213; the twelfth relay circuit 1211 is used to switch gears and measure the voltage unit in V or mV; the first voltage reduction circuit 1212 is a circuit for assisting the controller U11 to measure the voltage unit in V, and the second voltage reduction circuit 1213 becomes a voltage reduction circuit for assisting the controller U11 to measure the voltage unit in mV after being switched by the twelfth relay circuit 1211;

[0064] The 6-pin of the relay K11 of the eleventh relay circuit 1111 is connected to the controller U11 through the first voltage reduction circuit 1212;

[0065] The 6-pin of the relay K11 of the eleventh relay circuit 1111 is connected to the common port of the relay K12 of the twelfth relay circuit 1211, and the normally open port of the relay K12 of the twelfth relay circuit 1211 is connected to the controller U11 through the second voltage reduction circuit 1211;

[0066] The control end of the relay K12 of the twelfth relay circuit 1211 is connected to the control circuit 2000. The opening or closing of the relay K12 of the twelfth relay circuit 1211 is controlled by the control circuit 2000; when the relay K12 is closed, the signal enters the controller U11 through the first voltage reduction circuit 1212, and when the relay K12 is opened, the signal enters the controller U11 through the second voltage reduction circuit 1213; The 3-pin of the relay K12 is for mV unit measurement of the second voltage drop circuit 1211, when the voltage value delivered by the second voltage drop circuit 1211 to the controller U11 is higher than 1000mV, the control circuit 2000 automatically controls the relay K12 to switch to the first voltage drop circuit 1212 for measurement, and delivers the voltage value to the U11 for V unit measurement.

[0067] In another embodiment, the current reference input circuit 1220 comprises a thirteenth relay circuit 1221, a fourteenth relay circuit 1222, a third voltage drop circuit 1223 (for detecting A unit), a fourth voltage drop circuit 1224 (for detecting mA unit), and a fifth voltage drop circuit 1225 (for detecting uA unit);

[0068] The 8-pin of the relay K11 of the eleventh relay circuit 1111 is connected to the common port of the relay K13 of the thirteenth relay circuit 1221, the normally closed port of the relay K13 of the thirteenth relay circuit 1221 is connected to the common port and the normally open port of the relay K14 of the fourteenth relay circuit 1224 through the fifth voltage drop circuit, and then connected to the controller U11, the normally open port of the relay K13 of the thirteenth relay circuit 1221 is connected to the controller U11 through the third voltage drop circuit 1223, the fourth voltage drop circuit 1224, and the fifth voltage drop circuit 1225 in sequence, the normally closed port of the relay K13 of the thirteenth relay circuit 1221 is connected to the common port of the relay K14 of the fourteenth relay circuit 1222, and then connected to the controller U11 through the fourth voltage drop circuit 1224 and the fifth voltage drop circuit 1225 in sequence;

[0069] The control ends of the relays of the thirteenth relay circuit 1221 and the fourteenth relay circuit 1222 are connected to the control circuit 2000, and the 13-pin of the eleventh relay circuit is also connected to the controller U11.

[0070] The thirteenth relay circuit 1221 and the fourteenth relay circuit 1222 can be controlled to open or close by the control circuit 2000, so that the controller U11 detects the unit of current is A, mA or uA; when the thirteenth relay circuit 1221 and the fourteenth relay circuit 1222 are both powered off, the signal is transmitted to the controller U11 after passing through the fourth voltage reduction circuit 1224 and the fifth voltage reduction circuit 1225, when the thirteenth relay circuit 1221 is powered off and the fourteenth relay circuit 1222 is powered on, the signal is transmitted to the controller U11 after passing through the fifth voltage reduction circuit 1225, when the thirteenth relay circuit 1221 is powered on, the signal is transmitted to the controller U11 after passing through the third voltage reduction circuit 1223, the fourth voltage reduction circuit 1224 and the fifth voltage reduction circuit 1225.

[0071] In another preferred embodiment, the 3-pin of the relay K14 is for uA current transmission, when the transmitted current is greater than 100uA, the control circuit 2000 can automatically control the relay K13 to switch to the 2-pin mA grade transmission, when the mA current transmission is greater than 2000mA, the control circuit 2000 can also automatically control to switch to the 3-pin A grade detection of the relay K13.

[0072] In this embodiment, the specific wiring mode of the controller U11 is that the 1st port of the controller U11 is connected with the VPP end, the 1st port of the controller U11 is also connected with the ground through the capacitor C54, the 2nd port of the controller U11 is connected with the 3rd port of the controller U11 through the capacitor C57, the 4th port of the controller U11 is connected with the ground through the capacitor C60, the 5th port of the controller U11 is connected with the VCC end, the 6th port of the controller U11 is connected with the ground, the 6th port of the controller U11 is connected with the VCC end through the parallel capacitor C55 and capacitor C56, the 7th port of the controller U11 is connected with the ground through the capacitor C62, the 8th port of the controller U11 is connected with the ground through the capacitor C64, the 9th port of the controller U11 is connected with the low power detection circuit, the 10th port of the controller U11 is connected with the first voltage reduction circuit, the 11th port of the controller U11 is connected with the second voltage reduction circuit, the 12th port of the controller U11 is connected with the second voltage reduction circuit through the capacitor C66 and capacitor C65 in sequence, the 13th port of the controller U11 is connected with the second voltage reduction circuit through the capacitor C65, the 14th port of the controller U11 is connected with the 6th port of the eleventh relay circuit through the resistor R6 and switch S12 in sequence, the 15th port of the controller U11 is connected with the fifth voltage reduction circuit, the 15th port of the controller U11 is also connected with the 13th port of the eleventh relay circuit through the rectifier circuit, the 17th port of the controller U11 is connected with the 13th port of the eleventh relay circuit, the 19th port of the controller U11 is connected with the ground through the switch S1, the 20th port of the controller U11 is connected with the ground through the switch S2, the 28th pin of the controller U11 is connected with the ground through the resistor R100, the 34th pin of the controller U11 is connected with the indicator lamp circuit, the 35th pin and 36th pin of the controller U11 are both connected with the control circuit, and the 59th pin, 60th pin, 61st pin and 62nd pin of the controller U11 are connected with the first crystal circuit.

[0073] In another embodiment of the present disclosure, the control circuit comprises a microcontroller U1, and the 33rd pin, 34th pin, 35th pin, 36th pin, 38th pin, 39th pin, 40th pin, 41st pin, 42nd pin, 43rd pin, 63rd pin, 64th pin, 65th pin and 66th pin of the microcontroller U1 are connected with the first relay circuit to the fourteenth relay circuit one by one. The microcontroller U1 is used to control the opening or closing of the first relay circuit to the fourteenth relay circuit, so as to control the control circuit to detect the direct current voltage between the anode and the reference, the alternating current voltage between the alternating current sample and the reference, the direct current voltage between the self-corrosion sample and the reference, the direct current voltage between the polarization sample and the reference, the direct current voltage between the pipeline and the reference, and control the control value circuit 1200 to detect the voltage or current, and control the control value circuit 1200 to detect the value of the gear (A, mA, uA, V, mV, etc.).

[0074] In the preferred embodiment of the present disclosure, the 78th pin of the microcontroller U1 is connected with the 35th pin of the controller U11, and the 79th pin of the microcontroller U1 is connected with the 36th pin of the controller U11; the voltage signal and the current signal detected and calculated are transmitted into the microcontroller U1.

[0075] In an embodiment of the present disclosure, the 29th pin, the 30th pin, the 31st pin and the 32nd pin of the microcontroller U1 are connected with the storage circuit, the 67th pin, the 68th pin and the 69th pin of the microcontroller U1 are connected with the GPS circuit; the 72nd pin and the 76th pin of the microcontroller U1 are connected with the burning circuit, the 86th pin, the 87th pin, the 93rd pin, the 95th pin and the 96th pin of the microcontroller U1 are connected with the communication circuit, the 47th pin, the 48th pin, the 14th pin, the 6th pin, the 50th pin, the 75th pin, the 100th pin, the 28th pin, the 11th pin and the 44th pin of the microcontroller U1 are connected with the power management circuit, the 51st pin, the 52nd pin, the 53rd pin, the 54th pin, the 59th pin, the 60th pin and the 61st pin of the microcontroller U1 are connected with the display screen circuit, the 12th pin and the 13th pin of the microcontroller U1 are connected with the second crystal circuit, the 49th pin, the 74th pin, the 99th pin, the 27th pin and the 10th pin of the microcontroller U1 are grounded, the 15th pin of the microcontroller U1 is connected with the battery power module, the 23rd pin, the 80th pin and the 83rd pin of the microcontroller U1 are connected with the constant current and constant voltage circuit, the 1st pin, the 2nd pin, the 3rd pin, the 4th pin, the 5th pin, the 97th pin and the 98th pin of the microcontroller U1 are connected with the switch circuit; the 24th pin and the 25th pin of the microcontroller U1 are also connected with the temperature control circuit.

[0076] Referring to Figure 11 , Figure 12 , Figure 13 , Figure 14 , Figure 15 , the power management circuit 5000 includes a data acquisition circuit power supply circuit, a control circuit power supply circuit, a GPS power supply circuit and a communication circuit power supply circuit, a battery power detection circuit; the structure and connection relationship of the power supply circuit are more in the prior art, which will not be repeated here.

[0077] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any change or replacement without creative labor should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be limited by the protection scope defined in the claims.

Claims

1. A cathodic protection ultra-low voltage variable frequency control circuit, characterized in that, The circuit comprises: a data acquisition circuit for acquiring potential-related parameters of a protected cathode metal; a control circuit capable of receiving and transmitting the potential-related parameters, receiving the control parameters transmitted by an external server, and controlling the constant current and voltage output of a constant current and voltage circuit according to the control parameters, wherein the control parameters are obtained by the external server according to the potential-related parameters; a communication circuit for transmitting the potential-related parameters to the external server and receiving the control parameters; a constant current and voltage circuit for adjusting the potential parameters of an anode bed to make the potential of the protected cathode metal in a preset cathode protection potential interval; a power management circuit for providing power supply for all circuits; the data acquisition circuit, the communication circuit, the constant current and voltage circuit, and the power management circuit are connected with the control circuit.

2. The cathodically protected ultra-low voltage variable frequency control circuit of claim 1, wherein, The data acquisition circuit comprises a reference circuit and a measurement circuit connected with each other; the reference circuit is used for detecting the anode of the protected cathode metal, the alternating current test piece of the protected cathode metal, the self-corrosion test piece of the protected cathode metal, the polarization test piece of the protected cathode metal, and the reference signal between the protected cathode metal and the reference electrode, wherein the reference signal comprises a voltage reference signal and a current reference signal; the measurement circuit is used for measuring the voltage reference signal into a voltage value signal and converting the current reference signal into a current value signal.

3. The cathodically protected ultra-low voltage variable frequency control circuit of claim 2, wherein, The reference circuit comprises a first relay circuit to an eleventh relay circuit; the common port of the first relay circuit is capable of being connected with the anode of the protected cathode metal, the common port of the second relay circuit is capable of being connected with the alternating current test piece of the protected cathode metal, the common port of the third relay circuit is capable of being connected with the self-corrosion test piece of the protected cathode metal, the common port of the fourth relay circuit is capable of being connected with the polarization test piece of the protected cathode metal, the common port of the fifth relay circuit is capable of being connected with the protected cathode metal, and the 11th pin of the eleventh relay circuit is connected with the reference electrode; the normally closed ports of the first relay circuit to the fifth relay circuit are connected with each other, the normally open port of the first relay circuit is connected with the normally open port of the sixth relay circuit, the normally open port of the second relay circuit is connected with the normally open port of the seventh relay circuit, the normally open port of the third relay circuit is connected with the normally open port of the eighth relay circuit, the normally open port of the fourth relay circuit is connected with the normally open port of the ninth relay circuit, and the normally open port of the fifth relay circuit is connected with the normally open port of the tenth relay circuit and the 9th pin of the eleventh relay circuit, respectively, The common port of the sixth relay circuit to the tenth relay circuit is communicated with each other, and is communicated with the 4th pin of the eleventh relay circuit; the 8th pin of the eleventh relay circuit is connected with the measurement circuit (current reference signal), the 9th pin of the eleventh relay circuit is connected with the normally open port of the fifth relay circuit, the 11th pin of the eleventh relay circuit is connected with the reference signal, the 6th pin of the eleventh relay circuit is connected with the measurement circuit, and the 13th pin of the eleventh relay circuit is connected with the reference electrode; The control end of the first relay circuit to the eleventh relay circuit is connected with the control circuit.

4. The cathodically protected ultra-low voltage variable frequency control circuit of claim 2, wherein, The measurement circuit comprises: The controller U11 is used for measuring the voltage reference signal as a voltage value signal and converting the current reference signal into a current value signal; The voltage reference input circuit is used for transmitting the voltage reference signal output by the reference circuit to the controller U11; The current reference input circuit is used for transmitting the current reference signal output by the reference circuit to the controller U11; The reference circuit is connected with the controller U11 through the voltage reference input circuit and the current reference input circuit.

5. The cathodically protected ultra-low voltage variable frequency control circuit of claim 4, wherein, The voltage reference input circuit comprises a twelfth relay circuit, a first voltage reduction circuit and a second voltage reduction circuit; The 6th pin of the eleventh relay circuit is connected with the controller U11 through the first voltage reduction circuit; The 6th pin of the eleventh relay circuit is connected with the controller U11 through the common port of the twelfth relay circuit and the normally open port of the twelfth relay circuit connected with the controller U11 through the second voltage reduction circuit; The control end of the twelfth relay circuit is connected with the control circuit.

6. The cathodically protected ultra-low voltage variable frequency control circuit of claim 5, wherein: The current reference input circuit comprises a thirteenth relay circuit, a fourteenth relay circuit, a third voltage reduction circuit, a fourth voltage reduction circuit and a fifth voltage reduction circuit; The 8th pin of the eleventh relay circuit is connected with the common port of the thirteenth relay circuit, the normally closed port of the thirteenth relay circuit and the normally open port of the fourteenth relay circuit are connected with the controller U11 through the fifth voltage reduction circuit, the normally open port of the thirteenth relay circuit is connected with the controller U11 through the third voltage reduction circuit, the fourth voltage reduction circuit and the fifth voltage reduction circuit, and the normally closed port of the fourteenth relay circuit is connected with the controller U11 through the fourth voltage reduction circuit and the fifth voltage reduction circuit; The control end of the thirteenth relay circuit and the fourteenth relay circuit is connected with the control circuit; The 13th pin of the eleventh relay circuit is also connected with the controller U11.

7. The cathodically protected ultra-low voltage VFD control circuit of claim 6, wherein: The 1 port of the controller U11 is connected with the VPP end, the 1 port of the controller U11 is also connected with the ground through the capacitor C54, the 2 port of the controller U11 is connected with the 3 port of the controller U11 through the capacitor C57, the 4 port of the controller U11 is connected with the ground through the capacitor C60, the 5 port of the controller U11 is connected with the VCC end, the 6 port of the controller U11 is connected with the ground, the 6 port of the controller U11 is connected with the VCC end through the parallel capacitor C55 and the capacitor C56, the 7 port of the controller U11 is connected with the ground through the capacitor C62, the 8 port of the controller U11 is connected with the ground through the capacitor C64, the 9 port of the controller U11 is connected with the low power detection circuit, the 10 port of the controller U11 is connected with the first voltage reduction circuit, the 11 port of the controller U11 is connected with the second voltage reduction circuit, the 12 port of the controller U11 is connected with the second voltage reduction circuit through the capacitor C66 and the capacitor C65 in sequence, the 13 port of the controller U11 is connected with the second voltage reduction circuit through the capacitor C65, the 14 port of the controller U11 is connected with the 6 port of the eleventh relay circuit through the resistor R6 and the switch S12 in sequence, the 15 port of the controller U11 is connected with the fifth voltage reduction circuit, the 15 port of the controller U11 is also connected with the 13 port of the eleventh relay circuit through the rectifier circuit, the 17 port of the controller U11 is connected with the 13 port of the eleventh relay circuit, the 19 port of the controller U11 is connected with the ground through the switch S1, the 20 port of the controller U11 is connected with the ground through the switch S2, the 28 pin of the controller U11 is connected with the ground through the resistor R100, the 34 pin of the controller U11 is connected with the indicator lamp circuit, the 35 pin and the 36 pin of the controller U11 are connected with the control circuit, the 59 pin, the 60 pin, the 61 pin and the 62 pin of the controller U11 are connected with the first crystal circuit.

8. The cathodically protected ultra-low voltage VFC control circuit of claim 6, wherein: The control circuit comprises a microcontroller U1, the 33 pin, the 34 pin, the 35 pin, the 36 pin, the 38 pin, the 39 pin, the 40 pin, the 41 pin, the 42 pin, the 43 pin, the 63 pin, the 64 pin, the 65 pin and the 66 pin of the microcontroller U1 are connected with the first relay circuit to the fourteenth relay circuit one by one.

9. The cathodically protected ultra-low voltage VFD control circuit of claim 8, wherein: The 78 of the microcontroller U1 is connected with the 35 port of the controller U11, the 79 of the microcontroller U1 is connected with the 36 port of the controller U11.

10. The cathodically protected ultra-low voltage variable frequency control circuit of claim 8, wherein: The 29 pin, the 30 pin, the 31 pin and the 32 pin of the microcontroller U1 are connected with the storage circuit, the 67 pin, the 68 pin and the 69 pin of the microcontroller U1 are connected with the GPS circuit; The 72th pin and 76th pin of the microcontroller U1 are connected with the burning circuit, the 86th pin, 87th pin, 93th pin, 95th pin and 96th pin of the microcontroller U1 are connected with the communication circuit, the 47th pin, 48th pin, 14th pin, 6th pin 50th pin, 75th pin, 100th pin, 28th pin, 11th pin and 44th pin of the microcontroller U1 are connected with the power management circuit, the 51th pin, 52th pin, 53th pin, 54th pin, 59th pin, 60th pin, 61th pin of the microcontroller U1 are connected with the display screen circuit, the 12th pin and 13th pin of the microcontroller U1 are connected with the second crystal oscillation circuit, the 49th pin, 74th pin, 99th pin, 27th pin and 10th pin of the microcontroller U1 are grounded, the 15th pin of the microcontroller U1 is connected with the battery power module, the 23th pin, 80th pin and 83th pin of the microcontroller U1 are connected with the constant current and constant voltage circuit, the 1st pin, 2nd pin, 3rd pin, 4th pin, 5th pin, 97th pin and 98th pin of the microcontroller U1 are connected with the switch circuit.

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