A method and device for draining stray current from a stray current drainer

Abstract

The present invention discloses a method and device for draining a stray current drainer, which detects the voltage change at both ends of the drainer; when the voltage change is: there is a forward voltage drop in the drainer, and the forward voltage drop is greater than a preset first preset threshold, the error between the forward voltage drop and the first preset threshold is processed, and the internal circuit of the drainer is controlled to be turned on so that the stray current passes through the drainer; when the voltage change is: there is a reverse voltage in the drainer, the internal circuit of the drainer is controlled to be closed. Compared with the prior art, the present invention overcomes the problem of excessive forward voltage drop of the existing stray current drainer and improves the efficiency of cathodic protection.

Description

Technical Field

[0001] The present invention relates to the technical field of stray current, and in particular to a method and device for discharging stray current. Background Art

[0002] Stray current refers to the current flowing in a non-designated circuit. It may be caused by direct current or alternating current. With the continuous development and popularization of rail transit modes such as subways, stray currents will be generated during the operation of rail transit. The pipeline potential fluctuations caused by these stray currents will affect the normal operation of the cathodic protection system of the surrounding buried steel pipes, thereby destroying the protection of the pipeline. Therefore, drainage measures must be taken to control and eliminate the influence of stray currents. The existing methods of stray current interference mostly use drainage beds plus stray current drainers to solve the problem of stray current drainage. However, the main component of the existing drain, the diode, has a forward voltage drop that is too large, resulting in insufficient cathodic protection driving voltage and low cathodic protection efficiency. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a current discharge method and device of a stray current drainer, so as to overcome the problem of excessive forward voltage drop of the existing stray current drainer and improve the efficiency of cathode protection.

[0004] In order to solve the above technical problems, the present invention provides a method for discharging a stray current drainer, comprising:

[0005] Detect the voltage change at both ends of the drain;

[0006] When the voltage change condition is: the drain has a forward voltage drop, and the forward voltage drop is greater than a preset first threshold, the error between the forward voltage drop and the first preset threshold is processed, and the internal circuit of the drain is controlled to be turned on so that the stray current passes through the drain;

[0007] When the voltage variation is: when a reverse voltage exists in the drain, the internal circuit of the drain is controlled to be closed.

[0008] Furthermore, the internal circuit of the drain device includes a comparison amplifier circuit and a field effect transistor, specifically:

[0009] When there is a forward voltage drop in the drainer, the internal circuit of the drainer drives the field effect tube to conduct by controlling the comparison amplifier circuit to output a corresponding driving voltage;

[0010] When there is a reverse voltage drop in the drain, the internal circuit of the drain controls the comparison amplifier circuit to output a shutdown voltage to close the field effect tube path.

[0011] Furthermore, a stray current draining method provided by the present invention further includes: detecting the fluctuating voltage at the positive and negative ends of the drainer, obtaining a mathematical statistical calculation result of the fluctuating voltage, and comparing the mathematical statistical calculation result with a second preset threshold value;

[0012] If the mathematical statistical calculation result is less than the minimum value of the second preset threshold, the drainer is determined to be a short circuit fault; if the mathematical statistical calculation result is greater than the maximum value of the second preset threshold, the drainer is determined to be an open circuit fault;

[0013] When the drainer is determined to be faulty, the single chip microcomputer is controlled to output a driving signal to trigger the wireless alarm module, and the wireless alarm module remotely reports to the remote management terminal via a wireless signal.

[0014] Furthermore, a stray current discharge method provided by the present invention further includes: collecting AC energy of the positive electrode of the discharger, processing the AC energy, and controlling the supercapacitor to collect the processed AC energy;

[0015] When the drainer closes the current path, there is a reverse voltage drop between the positive and negative ends of the drainer, and the supercapacitor is controlled to collect the reverse voltage drop after voltage and current limiting processing.

[0016] Furthermore, a stray current discharge method provided by the present invention further includes: controlling the super capacitor to transmit the collected energy to the charging circuit after passing through the voltage adjustment circuit, so as to charge the rechargeable battery;

[0017] The rechargeable battery is used to provide working power for the comparison amplifier circuit and the field effect transistor.

[0018] Furthermore, the present invention also provides a stray current drain device, comprising: an ideal diode module, specifically:

[0019] The ideal diode module includes a first detection unit, a first voltage change module and a second voltage change module;

[0020] The first detection unit is used to detect the voltage change at both ends of the drain;

[0021] The first voltage change module is used to process the error between the forward voltage drop and the first preset threshold value when the voltage change condition is: the drain has a forward voltage drop, and the forward voltage drop is greater than a preset first preset threshold value, and control the internal circuit of the drain to be turned on, so that the stray current with a large current and a low voltage drop passes through the drain;

[0022] The second voltage change module is used to control the internal circuit of the drainer to close when the voltage change condition is: there is a reverse voltage in the drainer.

[0023] Furthermore, the internal circuit of the drain device includes a comparison amplifier circuit and a field effect transistor, specifically:

[0024] When there is a forward voltage drop in the drainer, the internal circuit of the drainer drives the field effect tube to conduct by controlling the comparison amplifier circuit to output a corresponding driving voltage;

[0025] When there is a reverse voltage drop in the drain, the internal circuit of the drain controls the comparison amplifier circuit to output a shutdown voltage to close the field effect tube path.

[0026] Furthermore, the stray current discharge device provided by the present invention further includes: a fault anti-theft alarm module, specifically:

[0027] The fault anti-theft alarm module includes a second detection unit, a fault determination unit and a wireless alarm unit;

[0028] The second detection unit is used to detect the fluctuating voltage at the positive and negative ends of the drain, obtain the mathematical statistical calculation result of the fluctuating voltage, and compare the mathematical statistical calculation result with the second preset threshold value;

[0029] The fault determination unit is used to determine that the drain device is a short circuit fault if the mathematical statistical calculation result is less than the minimum value of the second preset threshold value, and to determine that the drain device is an open circuit fault if the mathematical statistical calculation result is greater than the maximum value of the second preset threshold value;

[0030] The wireless alarm unit is used to control the single chip microcomputer to output a driving signal to trigger the wireless alarm module when the drainer is determined to be faulty. The wireless alarm module remotely reports to the remote management terminal via wireless signals.

[0031] Furthermore, the stray current discharge device provided by the present invention further includes: an energy collection module, specifically:

[0032] The energy collection module includes a first collection unit and a second collection unit;

[0033] The first collection unit is used to collect the AC energy of the positive electrode of the drainer, process the AC energy, and control the supercapacitor to collect the processed AC energy;

[0034] The second collecting unit is used for controlling the super capacitor to collect the reverse voltage drop after voltage and current limiting processing when the drainer closes the current path and there is a reverse voltage drop at the positive and negative ends of the drainer.

[0035] Furthermore, the stray current discharge device provided by the present invention further includes: a battery module, specifically:

[0036] The battery module includes a charging unit and a power supply unit;

[0037] The charging unit is used to control the supercapacitor to transmit the collected energy to the charging circuit after passing through the voltage adjustment circuit, so as to charge the rechargeable battery;

[0038] The power supply unit includes a rechargeable battery, which is used to provide working power for the ideal diode module.

[0039] The present invention provides a method and device for draining stray current drain, which has the following beneficial effects compared with the prior art:

[0040] By detecting the forward voltage drop of the drainer, the forward voltage drop is compared with a first preset threshold value; when the forward voltage drop is greater than the first preset threshold value, the error between the forward voltage drop and the first preset threshold value is processed, and the comparison amplifier circuit is controlled to output a corresponding driving voltage to drive the field effect tube to turn on; since the field effect tube is a voltage control device, there is a large current output when it is turned on, and low voltage drop can be achieved by increasing the driving voltage; since the enhanced field effect tube cannot be turned on when the gate voltage is not added, and the gate voltage can only be a forward voltage, when the drainer is detected to have a reverse voltage, the comparison amplifier circuit is controlled to output a shutdown voltage to close the field effect tube passage. Compared with the prior art, the present invention provides a method and device for draining a stray current drainer, which overcomes the problem of excessive forward voltage drop of the existing stray current drainer and improves the efficiency of cathode protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a flow chart of an embodiment of a current draining method of a stray current drainer provided by the present invention;

[0042] Figure 2 It is a structural schematic diagram of an embodiment of the stray current discharge device provided by the present invention;

[0043] Figure 3 It is a flow chart of another embodiment of the current draining method of the stray current drainer provided by the present invention;

[0044] Figure 4 is a structural schematic diagram of another embodiment of the stray current drain device provided by the present invention;

[0045] Figure 5 It is a flow chart of another embodiment of the current draining method of the stray current drainer provided by the present invention;

[0046] Figure 6It is a structural schematic diagram of another embodiment of the stray current draining device provided by the present invention;

[0047] Figure 7 It is a flow chart of another embodiment of the current draining method of the stray current drainer provided by the present invention;

[0048] Figure 8 It is a structural schematic diagram of another embodiment of the stray current discharge device provided by the present invention. DETAILED DESCRIPTION

[0049] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] Example 1

[0051] See also Figure 1 , Figure 1 FIG. 1 is a flow chart of an embodiment of a method for discharging a stray current drain provided by the present invention. Figure 1 As shown, the method includes steps 101 to 103, which are specifically as follows:

[0052] Step 101: Detect voltage changes at both ends of the drain.

[0053] In this embodiment, since the voltage at both ends of the drain device has two conditions, positive voltage and negative voltage, and the positive and negative voltages alternate, the voltage at both ends of the drain device must be detected first to determine the current voltage condition, and then different processing is performed according to the current voltage condition.

[0054] Step 102: When the voltage change is: there is a forward voltage drop in the drainer, and the forward voltage drop is greater than a preset first preset threshold, the error between the forward voltage drop and the first preset threshold is processed, and the internal circuit of the drainer is controlled to be turned on so that the stray current passes through the drainer.

[0055] In this embodiment, when it is detected that there is a forward voltage drop in the current drainer, the magnitude of the forward voltage value is detected. If the forward voltage drop is too large, it will affect the cathodic protection system of the surrounding pipelines. Therefore, by presetting a first preset threshold, when the detected forward voltage drop is greater than the preset first preset threshold, the error between the forward voltage drop and the first preset threshold is calculated. In this embodiment, the first preset threshold is 50mV. Since the internal circuit of the drainer includes a comparison amplifier circuit and a field effect transistor, the internal circuit of the drainer controls the comparison amplifier circuit to compare the forward voltage drop with the first preset threshold. The error of the first preset threshold is amplified to obtain a larger driving voltage. According to the characteristics of the field effect tube, when the field effect tube is turned on, the on-resistance is a resistance of the milliohm level. Therefore, the current flowing through is large, and when the driving voltage is large, the voltage drop is small. As an example of this embodiment, the number of the field effect tubes can be one, or a plurality of them can be connected in parallel to obtain a lower on-resistance. Therefore, when a larger driving voltage is used to drive the field effect tube to turn on, the voltage drop at both ends of the drain is small, so that the forward current of the stray current can pass through the drain with a large current and a low voltage drop.

[0056] Step 103: When the voltage variation is: when a reverse voltage exists in the drainer, the internal circuit of the drainer is controlled to be closed.

[0057] In this embodiment, due to the characteristics of the field effect tube, its operating voltage is a forward voltage. Therefore, when a reverse voltage is detected in the current drain, the internal circuit of the drain outputs a shutdown voltage by controlling the comparison amplifier circuit to shut down the field effect tube.

[0058] See also Figure 2 , Figure 2 FIG. 1 is a schematic diagram of a structure of an embodiment of a stray current discharge device provided by the present invention. Figure 2 As shown, the device includes an ideal diode module 201, which is specifically as follows:

[0059] The ideal diode module includes a first detection unit, a first voltage change module and a second voltage change module.

[0060] The first detection unit is used to detect the voltage change at both ends of the drain.

[0061] In this embodiment, since the voltage at both ends of the drain device has two conditions, positive voltage and negative voltage, and the positive and negative voltages alternate, the voltage at both ends of the drain device must be detected first to determine the current voltage condition, and then different processing is performed according to the current voltage condition.

[0062] The first voltage change module is used to process the error between the forward voltage drop and the first preset threshold value when the voltage change situation is: the drainer has a forward voltage drop and the forward voltage drop is greater than a preset first preset threshold value, and control the internal circuit of the drainer to be turned on so that the stray current with large current and low voltage drop can pass through the drainer.

[0063] In this embodiment, when it is detected that there is a forward voltage drop in the current drainer, the magnitude of the forward voltage value is detected. If the forward voltage drop is too large, it will affect the cathodic protection system of the surrounding pipelines. Therefore, by presetting a first preset threshold, when the detected forward voltage drop is greater than the preset first preset threshold, the error between the forward voltage drop and the first preset threshold is calculated. Since the internal circuit of the drainer includes a comparison amplifier circuit and a field effect transistor, the internal circuit of the drainer amplifies the error between the forward voltage drop and the first preset threshold by controlling the comparison amplifier circuit to obtain a larger driving voltage. According to the characteristics of the field effect transistor, when the field effect transistor is turned on, the on-resistance is in the milliohm range, so the current flowing through is large, and when the driving voltage is large, the voltage drop is small. As an example of this embodiment, the number of the field effect transistors can be one, or multiple field effect transistors can be connected in parallel to obtain a lower on-resistance. Therefore, when a larger driving voltage is used to drive the field effect transistor to turn on, the voltage drop at both ends of the drainer is small, so the forward current of the stray current can pass through the drainer with a large current and a low voltage drop.

[0064] The second voltage change module is used to control the internal circuit of the drainer to close when the voltage change condition is: there is a reverse voltage in the drainer.

[0065] In this embodiment, due to the characteristics of the field effect tube, its operating voltage is a forward voltage. Therefore, when a reverse voltage is detected in the current drain, the internal circuit of the drain outputs a shutdown voltage by controlling the comparison amplifier circuit to cause the field effect tube to shut down.

[0066] Embodiment 1 detects the forward voltage drop of the drainer and compares the forward voltage drop with a first preset threshold value; when the forward voltage drop is greater than the first preset threshold value, the error between the forward voltage drop and the first preset threshold value is processed, and the comparison amplifier circuit is controlled to output a corresponding driving voltage to drive the field effect tube to turn on; since the field effect tube is a voltage control device, there is a large current output when it is turned on, and low voltage drop can be achieved by increasing the driving voltage; since the enhanced field effect tube cannot be turned on when the gate voltage is not applied, and the gate voltage can only be a forward voltage, when the drainer is detected to have a reverse voltage, the comparison amplifier circuit is controlled to output a shutdown voltage to close the field effect tube passage. Compared with the prior art, the draining method and device of a stray current drainer provided in Embodiment 1 overcomes the problem of excessive forward voltage drop of the existing stray current drainer and improves the efficiency of cathode protection.

[0067] Example 2

[0068] See also Figure 3 , Figure 3 is a flow chart of another embodiment of the stray current discharge method provided by the present invention, for Figure 1 The difference of this embodiment is that Figure 1 Three steps are added on the basis of Figure 3 As shown, the added steps include step 301 to step 303, which are as follows:

[0069] Step 301: Detect the fluctuating voltage at the positive and negative ends of the drain device, obtain the mathematical statistical calculation result of the fluctuating voltage, and compare the mathematical statistical calculation result with a second preset threshold.

[0070] In this embodiment, since stray currents often fluctuate, fluctuating voltages will also be generated at the positive and negative ends of the drain. By detecting the fluctuating voltage and performing mathematical statistical calculations, the interference of the interference signal can be minimized. The mathematical statistical calculation results of the fluctuating voltage are compared with the preset voltage value. In this embodiment, the mathematical statistical calculation results of the fluctuating voltage are statistically collected within a preset time.

[0071] Step 302: If the mathematical statistical calculation result is less than the minimum value of the second preset threshold, the drainer is determined to be a short circuit fault; if the mathematical statistical calculation result is greater than the maximum value of the second preset threshold, the drainer is determined to be an open circuit fault.

[0072] In this embodiment, if the voltage drop at the positive and negative ends of the drain device fluctuates very little, or has not exceeded the minimum value of the second preset threshold, the drain device is deemed to have a short circuit fault. In this embodiment, the minimum value of the first preset threshold is 40mV; if the voltage drop at the positive and negative ends of the drain device fluctuates greatly, far exceeding the maximum value of the second preset threshold, the drain device is deemed to have an open circuit fault. In this embodiment, the maximum value of the second preset threshold is 0.6V.

[0073] Step 303: When the drainer is determined to be faulty, the single chip microcomputer is controlled to output a driving signal to trigger the wireless alarm module, and the wireless alarm module remotely reports to the remote management terminal via a wireless signal.

[0074] In this embodiment, when the drainer is determined to be one of the above faults, the single chip microcomputer outputs a corresponding drive signal, and the drive signal triggers the wireless alarm module after signal isolation, and the wireless alarm module remotely reports to the remote management terminal via a wireless signal.

[0075] See also Figure 4 , Figure 4 is a schematic structural diagram of another embodiment of the stray current drain device provided by the present invention. Figure 2 The difference of this embodiment is that Figure 2 A module is added on the basis of Figure 4 As shown, the added module is a fault anti-theft alarm module 401, which is as follows:

[0076] The fault anti-theft alarm module 401 includes a second detection unit, a fault determination unit and a wireless alarm unit.

[0077] The second detection unit is used to detect the fluctuating voltage at the positive and negative ends of the drainer, obtain the mathematical statistical calculation result of the fluctuating voltage, and compare the mathematical statistical calculation result with a second preset threshold.

[0078] In this embodiment, since the stray current often fluctuates, a fluctuating voltage will also be generated at the positive and negative ends of the drain. By detecting the fluctuating voltage and performing mathematical statistical calculations, the interference of the interference signal is minimized. The mathematical statistical calculation results of the fluctuating voltage are compared with the preset voltage value. In this embodiment, the mathematical statistical calculation results of the fluctuating voltage are statistically collected within a preset time.

[0079] The fault determination unit is used to determine that the drain device is a short circuit fault if the mathematical statistical calculation result is less than the minimum value of the second preset threshold, and to determine that the drain device is an open circuit fault if the mathematical statistical calculation result is greater than the maximum value of the second preset threshold.

[0080] In the present embodiment, if the voltage drop at the positive and negative ends of the drain device fluctuates very little, or has not exceeded the minimum value of the second preset threshold, the drain device is deemed to be a short circuit fault. In the present embodiment, the minimum value of the first preset threshold is 40mV; if the voltage drop at the positive and negative ends of the drain device fluctuates greatly, far exceeding the maximum value of the second preset threshold, the drain device is deemed to be an open circuit fault. In the present embodiment, the maximum value of the second preset threshold is 0.6V.

[0081] The wireless alarm unit is used to control the single chip microcomputer to output a driving signal to trigger the wireless alarm module when the drainer is determined to be faulty. The wireless alarm module remotely reports to the remote management terminal via wireless signals.

[0082] In this embodiment, when the drainer is determined to be one of the above faults, the single chip microcomputer outputs a corresponding drive signal, and the drive signal triggers the wireless alarm module after signal isolation, and the wireless alarm module remotely reports to the remote management terminal via a wireless signal.

[0083] Embodiment 2 is based on Embodiment 1. By detecting the fluctuating voltage at the positive and negative ends of the drain, the mathematical statistical calculation result of the fluctuating voltage is obtained, and the mathematical statistical calculation result is compared with the second preset threshold value; if the mathematical statistical calculation result is less than the minimum value of the second preset threshold value, the drain is determined to be a short circuit fault, and if the mathematical statistical calculation result is greater than the maximum value of the second preset threshold value, the drain is determined to be an open circuit fault; when the drain is determined to be a fault, the single-chip microcomputer is controlled to output a drive signal to trigger the wireless alarm module, and the wireless alarm module remotely reports to the remote management terminal via a wireless signal. Compared with the prior art, the draining method and device of a stray current drain provided in Embodiment 2 realizes the remote fault and anti-theft alarm functions, and improves the accuracy and reliability of fault alarms.

[0084] Example 3

[0085] See also Figure 5 , Figure 5 FIG. 1 is a flow chart of another embodiment of the method for discharging a stray current drain provided by the present invention. Figure 1 The difference of this embodiment is that Figure 1 Two steps are added on the basis of Figure 3 As shown, the added steps include step 501 to step 502, which are as follows:

[0086] Step 501: Collect the AC energy of the positive electrode of the drainer, process the AC energy, and control the supercapacitor to collect the processed AC energy.

[0087] In this embodiment, the AC energy of the positive electrode of the drain is collected by a current transformer. After a certain current transformation ratio, an induced current will be generated on the secondary side of the current transformer. After the induced current passes through a protection circuit and rectification, DC energy is output and the DC energy is collected by a supercapacitor.

[0088] Step 502: When the drainer closes the current path, there is a reverse voltage drop across the positive and negative ends of the drainer, and the supercapacitor is controlled to collect the reverse voltage drop after voltage and current limiting processing.

[0089] In this embodiment, when the DC fluctuation signal in the stray current is opposite to the discharge direction of the drainer, the drainer will close the current path, prevent the current signal from passing through, and form a reverse voltage drop at the positive and negative ends of the drainer. The reverse voltage drop is collected in the supercapacitor for storage after voltage and current limiting.

[0090] See also Figure 6 , Figure 6 is a structural schematic diagram of another embodiment of the stray current drain device provided by the present invention. Figure 2 The difference of this embodiment is that Figure 2 A module is added on the basis of Figure 6 As shown, the added module is the energy collection module 601, which is as follows:

[0091] The energy collection module includes a first collection unit and a second collection unit.

[0092] The first collection unit is used to collect the AC energy of the positive electrode of the drainer, process the AC energy, and control the supercapacitor to collect the processed AC energy.

[0093] In this embodiment, the AC energy of the positive electrode of the drain is collected by a current transformer. After a certain current transformation ratio, an induced current will be generated on the secondary side of the current transformer. After the induced current passes through a protection circuit and rectification, DC energy is output, and the DC energy is collected by a supercapacitor.

[0094] The second collecting unit is used for controlling the super capacitor to collect the reverse voltage drop after voltage and current limiting processing when the drainer closes the current path and there is a reverse voltage drop at the positive and negative ends of the drainer.

[0095] In this embodiment, in this embodiment, when the DC fluctuation signal in the stray current is opposite to the discharge direction of the drainer, the drainer will close the current path, prevent the current signal from passing through, and form a reverse voltage drop at the positive and negative ends of the drainer. The reverse voltage drop is collected in the supercapacitor for storage after voltage and current limiting.

[0096] Embodiment 3 is based on Embodiment 1, by collecting the AC energy of the positive electrode of the drainer and processing the AC energy, controlling the super capacitor to collect the processed AC energy; when the drainer closes the current path, there is a reverse voltage drop at the positive and negative ends of the drainer, and controlling the super capacitor to collect the reverse voltage drop after the voltage and current limiting processing. Compared with the prior art, the draining method and device of a stray current drainer provided in Embodiment 3 realizes the energy collection function and reduces energy waste.

[0097] Example 4

[0098] See also Figure 7 , Figure 7 FIG. 1 is a flow chart of another embodiment of the method for discharging a stray current drain provided by the present invention. Figure 1 and Figure 5 The difference of this embodiment is that Figure 1 and Figure 5 Two steps are added on the basis of Figure 7 As shown, the added steps include step 701 to step 702, which are as follows:

[0099] Step 701: Control the supercapacitor to transmit the collected energy to the charging circuit to charge the rechargeable battery.

[0100] In this embodiment, the supercapacitor collects a certain amount of energy and then starts the charging circuit after passing through the voltage adjustment circuit, and charges the rechargeable battery through the charging circuit. The charging circuit provides over-current, over-voltage and over-discharge protection for the rechargeable battery. The rechargeable battery in this embodiment can be self-powered and does not need to be replaced regularly.

[0101] Step 702: The rechargeable battery is used to provide working power for the comparison amplifier circuit and the field effect transistor.

[0102] In this embodiment, the rechargeable battery is used to provide working power for the diode and the field effect transistor. The energy of the rechargeable battery comes from the energy collected by the supercapacitor, and can also come from an external power supply device to charge the rechargeable battery.

[0103] See also Figure 8 , Figure 8 is a schematic structural diagram of another embodiment of the stray current drain device provided by the present invention. Figure 2 and Figure 6 The difference of this embodiment is that Figure 2 and Figure 6 A module is added on the basis of Figure 8As shown, the added module is a battery module 801, which is as follows:

[0104] The battery module includes a charging unit and a power supply unit;

[0105] The charging unit is used to control the super capacitor to transmit the collected energy to the charging circuit after passing through the voltage adjustment circuit, so as to charge the rechargeable battery.

[0106] In this embodiment, the supercapacitor collects a certain amount of energy and then starts the charging circuit after passing through the voltage adjustment circuit, and charges the rechargeable battery through the charging circuit. The charging circuit provides over-current, over-voltage and over-discharge protection for the rechargeable battery. The rechargeable battery in this embodiment can be self-powered and does not need to be replaced regularly.

[0107] The power supply unit comprises a rechargeable battery, which is used to provide working power for the diode and the field effect transistor.

[0108] In this embodiment, the rechargeable battery is used to provide working power for the diode and the field effect transistor. The energy of the rechargeable battery comes from the energy collected by the supercapacitor, and can also come from an external power supply device to charge the rechargeable battery.

[0109] Embodiment 4 is based on Embodiment 1 and Embodiment 3, and controls the super capacitor to transfer the collected energy to the charging circuit to charge the rechargeable battery; the rechargeable battery is used to provide working power for the ideal diode module. Compared with the prior art, the current discharge method and device of the stray current drainer provided in Embodiment 4 realizes the self-powered function of the stray current drainer.

[0110] In summary, the present invention provides a current discharge method and device for a stray current drainer, which detects the forward voltage drop of the drainer and compares the forward voltage drop with a first preset threshold value; when the forward voltage drop is greater than the first preset threshold value, the error between the forward voltage drop and the first preset threshold value is processed, and the comparison amplifier circuit is controlled to output a corresponding driving voltage to drive the field effect tube to turn on; since the field effect tube is a voltage-controlled device, there is a large current output when it is turned on, and a low voltage drop can be achieved by increasing the driving voltage; since the enhanced field effect tube cannot be turned on when the gate voltage is not applied, and the gate voltage can only be a forward voltage, when a reverse voltage is detected in the drainer, the comparison amplifier circuit is controlled to output a shutdown voltage to turn off the field effect tube path. Compared with the prior art, the present invention provides a method and device for discharging a stray current drainer, which not only overcomes the problem of excessive forward voltage drop of the prior stray current drainer and improves the efficiency of cathodic protection, but also realizes remote fault and anti-theft alarm functions, improves the accuracy and reliability of fault alarms, and provides an energy collection function, realizing the self-power supply function of the stray current drainer.

[0111] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A method for discharging a stray current drain, characterized in that: include: Detect the voltage change at both ends of the drain; When the voltage change condition is: the drain has a forward voltage drop, and the forward voltage drop is greater than a preset first threshold, the error between the forward voltage drop and the first preset threshold is processed, and the internal circuit of the drain is controlled to be turned on so that the stray current passes through the drain; When the voltage changes as follows: when there is a reverse voltage on the drainer, the internal circuit of the drainer is controlled to be closed; The internal circuit of the drain device includes a comparison amplifier circuit and a field effect transistor, specifically: When there is a forward voltage drop in the drainer, the internal circuit of the drainer drives the field effect tube to conduct by controlling the comparison amplifier circuit to output a corresponding driving voltage; When there is a reverse voltage drop in the drain, the internal circuit of the drain controls the comparison amplifier circuit to output a shutdown voltage to close the field effect tube path; Detecting the fluctuating voltage at the positive and negative ends of the drainer, obtaining a mathematical statistical calculation result of the fluctuating voltage, and comparing the mathematical statistical calculation result with a second preset threshold value; If the mathematical statistical calculation result is less than the minimum value of the second preset threshold, the drainer is determined to be a short circuit fault; if the mathematical statistical calculation result is greater than the maximum value of the second preset threshold, the drainer is determined to be an open circuit fault; When the drainer is determined to be faulty, the single chip microcomputer is controlled to output a driving signal to trigger the wireless alarm module, and the wireless alarm module remotely reports to the remote management terminal via a wireless signal.

2. A method for discharging stray current as claimed in claim 1, characterized in that: Also includes: Collecting the AC energy of the positive electrode of the drainer, processing the AC energy, and controlling the supercapacitor to collect the processed AC energy; When the drainer closes the current path, there is a reverse voltage drop between the positive and negative ends of the drainer, and the supercapacitor is controlled to collect the reverse voltage drop after voltage and current limiting processing.

3. A method for discharging stray current as claimed in claim 2, characterized in that: Also includes: Controlling the supercapacitor to transmit the collected energy to the charging circuit after passing through the voltage regulating circuit, so as to charge the rechargeable battery; The rechargeable battery is used to provide working power for the comparison amplifier circuit and the field effect transistor.

4. A stray current discharge device, characterized in that: include: Ideal diode module and fault anti-theft alarm module; The ideal diode module includes a first detection unit, a first voltage change module and a second voltage change module; The first detection unit is used to detect the voltage change at both ends of the drain; The first voltage change module is used to process the error between the forward voltage drop and the first preset threshold value when the voltage change condition is: the drain has a forward voltage drop, and the forward voltage drop is greater than a preset first preset threshold value, and control the internal circuit of the drain to be turned on, so that the stray current with a large current and a low voltage drop passes through the drain; The second voltage change module is used to control the internal circuit of the drainer to close when the voltage change condition is: there is a reverse voltage in the drainer; The internal circuit of the drainer includes a comparison amplifier circuit and a field effect transistor, specifically: When there is a forward voltage drop in the drainer, the internal circuit of the drainer drives the field effect tube to conduct by controlling the comparison amplifier circuit to output a corresponding driving voltage; When there is a reverse voltage drop in the drain, the internal circuit of the drain controls the comparison amplifier circuit to output a shutdown voltage to close the field effect tube path; The fault anti-theft alarm module includes a second detection unit, a fault determination unit and a wireless alarm unit; The second detection unit is used to detect the fluctuating voltage at the positive and negative ends of the drain, obtain the mathematical statistical calculation result of the fluctuating voltage, and compare the mathematical statistical calculation result with the second preset threshold value; The fault determination unit is used to determine that the drain device is a short circuit fault if the mathematical statistical calculation result is less than the minimum value of the second preset threshold value, and to determine that the drain device is an open circuit fault if the mathematical statistical calculation result is greater than the maximum value of the second preset threshold value; The wireless alarm unit is used to control the single chip microcomputer to output a driving signal to trigger the wireless alarm module when the drainer is determined to be faulty. The wireless alarm module remotely reports to the remote management terminal via wireless signals.

5. A stray current drain device as claimed in claim 4, characterized in that: Also includes: Energy harvesting module, specifically: The energy collection module includes a first collection unit and a second collection unit; The first collection unit is used to collect the AC energy of the positive electrode of the drainer, process the AC energy, and control the supercapacitor to collect the processed AC energy; The second collecting unit is used for controlling the super capacitor to collect the reverse voltage drop after voltage and current limiting processing when the drainer closes the current path and there is a reverse voltage drop at the positive and negative ends of the drainer.

6. A stray current drain device as claimed in claim 5, characterized in that: Also includes: Battery modules, specifically: The battery module includes a charging unit and a power supply unit; The charging unit is used to control the supercapacitor to transfer the collected energy to the charging circuit to charge the rechargeable battery; The power supply unit includes a rechargeable battery, which is used to provide working power for the ideal diode module.

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