Ground wire control method, device and system, storage medium and program product

Abstract

The invention relates to a ground wire control method, device and system, a storage medium and a program product. The ground wire control method comprises the steps that ground wire impedance of equipment is obtained, the equipment is connected with a ground wire network of the equipment, and the ground wire network of the equipment is connected with a ground network of the equipment; acquiring a common-mode current on a power line of a ground wire network of the equipment; determining compensation current of the equipment according to the common-mode current and the ground wire impedance; and controlling the compensation current to be injected into a ground wire network of the equipment. The compensation current of the equipment can be determined according to the common-mode current and the ground wire impedance, so that ground loop coupling is effectively eliminated, noise interference in system operation is remarkably reduced, the problem of system instability caused by ground potential difference and common-mode coupling is reduced, and the reliability of the system is improved. And long-term stable operation of equipment in a complex and changeable electromagnetic environment is ensured.

Description

Technical Field

[0001] The present disclosure relates to the field of ground line control technology, and in particular to a ground line control method, device and system, storage medium and program product. Background Art

[0002] Related technology: High-frequency switching power supplies are common power supply equipment for building automation systems. During operation, they generate wide-spectrum noise. These noises interfere with the ground networks of weak-current devices such as CAN (Controller Area Network) and RS-485 through conduction and near-field radiation, changing the impedance of the ground network and causing a potential difference between the ground network and the earth network. This potential difference forms a loop through the ground wire, exacerbating the coupling effect of common-mode noise and affecting the stability and reliability of the system. Summary of the Invention

[0003] Through research, the inventors found that the related art ground noise suppression method uses technologies such as transformer isolation and optoelectronic coupling to avoid the formation of ground loops, but the related art ground noise suppression method is not effective when facing complex and changeable high-frequency environments. Because the ground wire always exists and the ground wire impedance does not become zero, the ground wire noise interference will not completely disappear, making it difficult to ensure system stability.

[0004] In view of at least one of the above technical problems, the present disclosure provides a ground line control method, device and system, storage medium and program product, which can effectively eliminate ground loop coupling and significantly reduce noise interference during system operation.

[0005] According to one aspect of the present disclosure, a ground line control method is provided, comprising:

[0006] obtaining a ground impedance of a device, wherein the device is connected to a ground network of the device, and the ground network of the device is connected to an earth network of the device;

[0007] Obtain the common mode current on the power line of the ground network of the device;

[0008] determining a compensation current of the device according to the common mode current and the ground line impedance;

[0009] The compensation current is controlled to be injected into the ground network of the device.

[0010] In some embodiments of the present disclosure, obtaining the ground impedance of the device includes:

[0011] Control the detection current injected into the ground network of the device;

[0012] Obtaining the original voltage difference between the ground network of the device and the earth network of the device;

[0013] The ground impedance of the device is determined according to the detected current value and the original voltage difference.

[0014] In some embodiments of the present disclosure, controlling the detection current to be injected into the ground network of the device includes:

[0015] Injecting the detection current into the ground network of the device through an injection resistor;

[0016] Collect the injected resistor voltage;

[0017] The detection current value is determined according to the injection resistor voltage and the resistance value of the injection resistor.

[0018] In some embodiments of the present disclosure, obtaining the original pressure difference between the ground network of the device and the earth network of the device includes:

[0019] amplifying the original voltage difference by a first operational amplifier;

[0020] Collect the amplified original voltage difference as the collected voltage value;

[0021] The original voltage difference is determined according to the collected voltage value and the amplification factor of the first operational amplifier.

[0022] In some embodiments of the present disclosure, obtaining the common-mode current on the power line of the ground network of the device includes:

[0023] Detect the common mode current on the power line through the current transformer;

[0024] amplifying the common-mode current by a second operational amplifier;

[0025] collecting the amplified common-mode current as a collected current value;

[0026] The common-mode current is determined according to the collected current value and the amplification factor of the second operational amplifier.

[0027] In some embodiments of the present disclosure, determining the compensation current of the device according to the common-mode current and the ground impedance includes:

[0028] Get the ground potential difference;

[0029] The compensation current is determined according to the ground line impedance, the compensation coefficient, the ground potential difference and the common mode current.

[0030] In some embodiments of the present disclosure, the multi-node ground network includes multiple devices, and the method further includes:

[0031] For each of the plurality of devices, controlling the connection of each device to a ground network of the device, and controlling the connection of the ground network of each device to an earth network of the device;

[0032] For each of the devices, performing the step of obtaining the ground impedance of the device;

[0033] The earth network with the smallest ground impedance is taken as the target earth network;

[0034] Control the ground network of each device to be connected to the target earth network.

[0035] In some embodiments of the present disclosure, controlling the ground network of each device to be connected to the target earth network includes:

[0036] Control the ground network of each device to be disconnected from the earth network of the device;

[0037] Control the ground network of each device to be connected to the target earth network.

[0038] In some embodiments of the present disclosure, the ground line control method further includes:

[0039] The device with the smallest ground impedance is selected as the target device;

[0040] Obtaining a common-mode current on a power line of a ground network of the target device;

[0041] determining a target compensation current of the target device according to the common mode current and the ground impedance;

[0042] The target compensation current is controlled to be injected into the ground network of each device.

[0043] In some embodiments of the present disclosure, the ground line control method further includes:

[0044] Determining whether there is ground network noise between the ground network of each device and the target earth network;

[0045] In the absence of ground network noise, maintaining control of injecting the compensation current into the ground network of each device;

[0046] In the presence of ground network noise, the steps of controlling the connection between each device and the ground network of the device, controlling the connection between the ground network of each device and the earth network of the device, obtaining the ground impedance of each device, using the earth network with the smallest ground impedance as the target earth network, controlling the ground network of each device to be connected to the target earth network, using the device corresponding to the smallest ground impedance as the target device, obtaining the common-mode current on the power line of the ground network of the target device, determining the target compensation current of the target device based on the common-mode current and the ground impedance, controlling the target compensation current to be injected into the ground network of each device, and determining whether there is ground network noise between the ground network of each device and the target earth network.

[0047] In some embodiments of the present disclosure, controlling the connection between the ground network of each device and the earth network of the device includes:

[0048] By closing all relays in the first relay group and opening all relays in the second relay group, the ground network of each device is controlled to be connected to the earth network of the device, wherein a first relay is set between the ground network of each device and the earth network of the device, and a second relay is set between the outlets of every two adjacent ground networks.

[0049] In some embodiments of the present disclosure, controlling the ground network of each device to be connected to the target earth network includes:

[0050] By closing all relays in the second relay group, closing the target relay between the target earth network and the ground network of the device corresponding to the target earth network, and disconnecting the other relays in the first relay group except the target relay, the ground network of each device is controlled to be connected to the target earth network, wherein a first relay is set between the ground network of each device and the earth network of the device, and a second relay is set between the outlets of every two adjacent ground networks.

[0051] According to another aspect of the present disclosure, there is provided a ground line control device, comprising:

[0052] an impedance acquisition module configured to acquire a ground impedance of a device, wherein the device is connected to a ground network of the device, and the ground network of the device is connected to an earth network of the device;

[0053] a common-mode current acquisition module, configured to acquire a common-mode current on a power line of a ground network of the device;

[0054] a compensation current determination module, configured to determine a compensation current of the device according to the common mode current and the ground line impedance;

[0055] The compensation current injection module is configured to control the compensation current to be injected into the ground network of the device.

[0056] According to another aspect of the present disclosure, there is provided a ground line control device, comprising:

[0057] Memory; and

[0058] A processor coupled to the memory, wherein the processor is configured to execute the ground line control method as described in any one of the above embodiments based on instructions stored in the memory.

[0059] According to another aspect of the present disclosure, there is provided a ground line control system, comprising:

[0060] a ground line optimization device configured to collect a common mode current on a power line of a ground line network of the device and send the common mode current to a ground line control device;

[0061] The ground control device as described in any of the above embodiments is configured to obtain a ground impedance of a device, wherein the device is connected to a ground network of the device, and the ground network of the device is connected to an earth network of the device; and determine a compensation current of the device according to the common mode current and the ground impedance;

[0062] The ground wire detection device is configured to inject a compensation current into the ground wire network of the equipment according to the instruction of the ground wire control device.

[0063] In some embodiments of the present disclosure, the ground line detection device includes:

[0064] a current injection module configured to inject a detection current into the ground network of the device according to an instruction of the ground control device;

[0065] The ground voltage acquisition module is configured to acquire the original voltage difference between the ground network of the device and the earth network of the device when the current injection module injects the detection current into the ground network of the device, and send the original voltage difference to the ground control device.

[0066] In some embodiments of the present disclosure, the ground line control device is further configured to determine the ground line impedance of the device according to the detected current value and the original voltage difference.

[0067] In some embodiments of the present disclosure, the current injection module includes:

[0068] The injection resistor is configured to inject the sense current into the ground network of the device.

[0069] In some embodiments of the present disclosure, the ground line control device is further configured to collect the injection resistor voltage; and determine the detection current value according to the injection resistor voltage and the resistance value of the injection resistor.

[0070] In some embodiments of the present disclosure, the ground voltage acquisition module includes:

[0071] The first operational amplifier is configured to amplify an original voltage difference between the ground network of the device and the earth network of the device.

[0072] In some embodiments of the present disclosure, the ground line control device is further configured to collect the amplified original voltage difference as a collected voltage value; and determine the original voltage difference based on the collected voltage value and the amplification factor of the first operational amplifier.

[0073] In some embodiments of the present disclosure, the ground line optimization device includes:

[0074] a current transformer configured to detect a common-mode current on the power line;

[0075] The second operational amplifier is configured to amplify the common-mode current.

[0076] In some embodiments of the present disclosure, the ground line control device is further configured to collect the amplified common-mode current as a collected current value; and determine the common-mode current based on the collected current value and the amplification factor of the second operational amplifier.

[0077] In some embodiments of the present disclosure, a multi-node ground wire network includes multiple devices, and the ground wire control system further includes:

[0078] The ground network dynamic switching device is configured to control each device in the multiple devices to connect to the ground network of the device according to the instructions of the ground control device, and control the ground network of each device to connect to the earth network of the device.

[0079] In some embodiments of the present disclosure, the ground line control device is further configured to perform an operation of obtaining the ground line impedance of each device; and select the ground network with the smallest ground line impedance as the target ground network;

[0080] The ground network dynamic switching device is further configured to control the ground network of each device to be connected to the target earth network according to the instruction of the ground control device.

[0081] In some embodiments of the present disclosure, the ground network dynamic switching device includes:

[0082] a first relay group, wherein a first relay is provided between the ground network of each device and the earth network of the device; and

[0083] The second relay group includes a second relay provided between each two adjacent ground network outlets.

[0084] In some embodiments of the present disclosure, the ground wire control device is further configured to control the connection of the ground wire network of each device to the earth network of the device by closing all relays in the first relay group and disconnecting all relays in the second relay group; and to control the connection of the ground wire network of each device to the target earth network by closing all relays in the second relay group, closing the target relay between the target earth network and the ground wire network of the device corresponding to the target earth network, and disconnecting other relays in the first relay group except the target relay.

[0085] According to another aspect of the present disclosure, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and when the instructions are executed by a processor, the ground line control method as described in any of the above embodiments is implemented.

[0086] According to another aspect of the present disclosure, a computer program product is provided, comprising a computer program, wherein when the computer program is executed by a processor, the ground line control method as described in any one of the above embodiments is implemented.

[0087] The present disclosure can effectively eliminate ground loop coupling by determining the compensation current of the device based on the common-mode current and ground impedance, significantly reducing noise interference during system operation, thereby reducing system instability problems caused by ground potential differences and common-mode coupling, and ensuring long-term stable operation of the device in complex and changeable electromagnetic environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0088] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0089] Figure 1 Schematic diagram of some embodiments of the ground wire control system disclosed herein.

[0090] Figure 2 Schematic diagrams of other embodiments of the ground wire control system disclosed herein.

[0091] Figure 3 Schematic diagrams of some further embodiments of the ground wire control system disclosed herein.

[0092] Figure 4 Schematic diagram of a ground line detection device in some embodiments of the present disclosure.

[0093] Figure 5 Schematic diagram of a ground line optimization device in some embodiments of the present disclosure.

[0094] Figure 6 Schematic diagrams of some further embodiments of the ground wire control system disclosed herein.

[0095] Figure 7 Schematic diagram of some embodiments of the ground line control method disclosed herein.

[0096] Figure 8 Schematic diagram of some embodiments of the ground line control method disclosed herein.

[0097] Figure 9 Schematic diagrams of some embodiments of the ground control device disclosed herein.

[0098] Figure 10 Schematic diagram of the structure of other embodiments of the ground wire control device disclosed in the present invention. DETAILED DESCRIPTION

[0099] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present disclosure and its application or use. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present disclosure.

[0100] Unless specifically stated otherwise, the relative arrangement of components and steps, the numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present disclosure.

[0101] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0102] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0103] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0104] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0105] Through research, the inventors discovered that in the operation of high-frequency switching power supplies in related technologies, the ground network nodes of different devices have different sensitivities to noise due to differences in layout and impedance characteristics, and exhibit different degrees of influence. The fixed grounding mode of the related technology cannot dynamically switch to ground network nodes with less interference, resulting in reduced system stability and increased communication bit error rate.

[0106] Related ground noise suppression methods use transformer isolation and optoelectronic coupling to avoid the formation of ground loops. However, they are not very effective in complex and changeable high-frequency environments. Because the ground wire always exists and the ground wire impedance does not become zero, the ground wire noise interference will not completely disappear, making it difficult to ensure system stability.

[0107] In view of at least one of the above technical problems, the present disclosure provides a ground line control method, device and system, storage medium and program product. The present disclosure is described below through specific embodiments.

[0108] Figure 1 Schematic diagram of some embodiments of the ground wire control system disclosed herein. Figure 2 Schematic diagrams of other embodiments of the ground wire control system disclosed herein. Figure 1 and Figure 2 As shown, the ground wire control system of the present disclosure may include at least one of a ground wire optimization device 10 , a ground wire control device U1 and a ground wire detection device 30 .

[0109] The ground line optimization device 10 is configured to collect the common mode current on the power line of the ground line network of the equipment and send the common mode current to the ground line control device.

[0110] The ground control device U1 is configured to obtain the ground impedance of the device, wherein the device is connected to the ground network of the device, and the ground network 50 of the device 40 is connected to the earth network 60 of the device; and determine the compensation current of the device according to the common mode current and the ground impedance.

[0111] In some embodiments of the present disclosure, the local ground network refers to the reference potential reference inside each controller or each device or the circuit to which it belongs, which is used to construct the potential zero point of the local circuit to ensure the stability of signal transmission and power supply circuit.

[0112] In some embodiments of the present disclosure, the Earth Ground Network refers to a conductive network connected to the actual earth, which forms an electrical connection with the earth through a grounding electrode (such as a buried metal rod) to achieve safe grounding and lightning protection of the system.

[0113] The ground wire detection device 30 is configured to inject a compensation current into the ground wire network of the device according to the instruction of the ground wire control device.

[0114] The above-mentioned embodiments of the present disclosure can effectively eliminate ground loop coupling by determining the compensation current of the device based on the common-mode current and the ground line impedance, significantly reducing noise interference during system operation, thereby reducing system instability problems caused by ground potential differences and common-mode coupling, and ensuring the long-term stable operation of the device in complex and changeable electromagnetic environments.

[0115] The above-mentioned embodiments of the present disclosure solve the technical problem that in a complex electromagnetic environment, traditional noise suppression methods cannot avoid ground impedance changes, and are prone to generating noise due to ground impedance differences and common-mode current coupling, resulting in reduced system stability.

[0116] Figure 3 Schematic diagrams of some further embodiments of the ground wire control system disclosed herein. Figure 4 Schematic diagram of a ground line detection device in some embodiments of the present disclosure. Figures 2 to 4 As shown, the ground line detection device of the present disclosure (eg Figure 1 、 Figure 2 or Figure 4 The ground line detection device 30 of the embodiment may include at least one of a current injection module 31 and a ground voltage acquisition module 32 .

[0117] The current injection module 31 is configured to inject a detection current into the ground network of the device according to the instruction of the ground control device.

[0118] The ground voltage acquisition module 32 is configured to acquire the original voltage difference V between the ground network of the device and the earth network of the device when the current injection module injects the detection current into the ground network of the device. drop and sends the original pressure difference to the ground line control device.

[0119] In some embodiments of the present disclosure, the ground line control device U1 may also be configured to determine the ground line impedance of the device according to the detected current value and the original voltage difference.

[0120] The above-mentioned embodiments of the present disclosure detect the current value and the voltage difference between the ground network and the earth network through the cooperation of the current injection module, the ground voltage acquisition module and the ground wire control device, thereby accurately calculating the ground wire impedance of the equipment, and then accurately calculating the compensation current, thereby effectively eliminating the influence of noise on the ground wire network.

[0121] In some embodiments of the present disclosure, the ground control device U1 can also be configured to, according to formula (1), determine the value of the injected detection current I inj and the original pressure difference V drop, determine the ground impedance of the device.

[0122]

[0123] In some embodiments of the present disclosure, Figure 2 and Figure 4 As shown, the current injection module 31 may include an injection resistor R1.

[0124] The injection resistor R1 is configured to inject the detection current into the ground network of the device.

[0125] In some embodiments of the present disclosure, the ground line control device U1 may also be configured to collect an injection resistor voltage; and determine a detection current value according to the injection resistor voltage and a resistance value of the injection resistor R1.

[0126] The above-mentioned embodiment of the present disclosure cooperates with the injection resistor and the ground wire control device to accurately determine the detection current value according to the injection resistor voltage and the resistance value of the injection resistor. Therefore, the ground wire impedance of the equipment can be accurately calculated by detecting the current value and the voltage difference between the ground wire network and the earth network, and then the compensation current can be accurately calculated, thereby effectively eliminating the influence of noise on the ground wire network.

[0127] In some embodiments of the present disclosure, the ground line control device U1 can be implemented as a main control chip.

[0128] In some embodiments of the present disclosure, the DAC pin (pin 1 of U1) in the ground wire control device U1 will output a specific current (detection current) and inject the detection current into the ground wire network. The ground wire control device U1 collects the resistance voltage of R1 through the ADC pin (pin 2 of U1) to determine the size of the injected current.

[0129] In some embodiments of the present disclosure, the ground control device U1 may also be configured to collect the injection resistor voltage V according to formula (2). DAC According to the injection resistance voltage V DAC and the resistance value of the injection resistor R1 inj , determine the detection current value I inj .

[0130] I inj =V DAC / R inj (2)

[0131] In formula (2), V DAC It is the resistance voltage of R1 collected by the ground control device U1 through the ADC pin (pin 2 of U1).

[0132] In some embodiments of the present disclosure, Figure 2 and Figure 4 As shown, the ground voltage acquisition module 32 may include a first operational amplifier U2 -A.

[0133] The first operational amplifier U2-A is configured to amplify the original voltage difference between the ground network of the device and the earth network of the device.

[0134] In some embodiments of the present disclosure, the ground control device U1 may also be configured to collect the amplified original voltage difference as a collected voltage value; and determine the original voltage difference based on the collected voltage value and the amplification factor of the first operational amplifier.

[0135] The above-mentioned embodiment of the present disclosure amplifies the voltage difference between the ground network and the earth network through the first operational amplifier. Through the cooperation of the first operational amplifier and the ground control device, the voltage difference between the ground network and the earth network can be determined more conveniently and accurately. Therefore, the ground impedance of the equipment can be accurately calculated by detecting the current value and the voltage difference between the ground network and the earth network, and then the compensation current can be accurately calculated, thereby effectively eliminating the influence of noise on the ground network.

[0136] In some embodiments of the present disclosure, the ground control device U1 can also be configured to collect the amplified original voltage difference as the collected voltage value V measured According to formula (3), according to the collected voltage value V measured and the amplification factor A1 of the first operational amplifier, determine the original voltage difference V drop .

[0137] V drop =V measured / A1 (3)

[0138] In formula (3), V measured It is amplified by the first operational amplifier U2-A and then connected to the ADC pin 3 ( Figure 2 and Figure 4 )The actual collected voltage value.

[0139] In some embodiments of the present disclosure, the first operational amplifier U2-A can also be configured to make a difference in the voltage between the ground network and the earth network, amplify it by a certain multiple and input it to the ADC pin (pin 3) of the ground control device U1 to read the ground voltage.

[0140] In some embodiments of the present disclosure, the ground control device U1 can also be configured to calculate the measured ground network voltage according to formula (4) to obtain the ground network impedance and analyze the interference level of the ground noise, wherein formula (4) is obtained by substituting formulas (2) and (3) into formula (1).

[0141]

[0142] Figure 5 Schematic diagram of a ground line optimization device in some embodiments of the present disclosure. Figure 2 and Figure 5 As shown, the ground line optimization device 10 of the present disclosure may further include at least one of a current transformer L1 and a second operational amplifier U3-A.

[0143] The current transformer L1 is configured to detect the common-mode current on the power line.

[0144] The second operational amplifier U3-A is configured to amplify the common-mode current.

[0145] In some embodiments of the present disclosure, the ground control device U1 can also be configured to collect the amplified common-mode current as a collected current value; and determine the common-mode current Icm based on the collected current value and the amplification factor A2 of the second operational amplifier.

[0146] The above-mentioned embodiments of the present disclosure provide a dynamically optimized noise compensation method and system, which uses a current transformer to surround the power line to detect the common-mode current, combines it with the ground network impedance for analysis, calculates the compensation current, and injects the compensation current into the ground line with an opposite polarity, thereby effectively eliminating the impact of noise on the ground network.

[0147] In some embodiments of the present disclosure, the ground control device U1 may also be configured to obtain a ground potential difference; and determine the compensation current according to the ground impedance, the compensation coefficient, the ground potential difference, and the common-mode current.

[0148] The above-mentioned embodiments of the present disclosure can accurately calculate the compensation current based on the ground impedance, compensation coefficient, ground potential difference and the common-mode current, and reversely inject the compensation current into the ground network to neutralize the common-mode noise energy, thereby effectively eliminating the impact of noise on the ground network.

[0149] In some embodiments of the present disclosure, the ground line control device U1 may also be configured to calculate the ground line impedance Z according to formula (5). g , compensation coefficient k, the ground potential difference V gnd and the common mode current I cm , determine the compensation current I comp .

[0150]

[0151] In formula (5), the compensation coefficient k is used to adjust the magnitude of the compensation current; I cm Represents the detected common-mode current (unit: A), measured by the current transformer; ground potential difference Vgnd It is made by the ground detection device ( Figure 2 and Figure 4 ) is measured by ADC pin 2 of the ground control device U1 and transmitted to the ground control device U1.

[0152] In some embodiments of the present disclosure, Figure 2 and Figure 5 As shown, the ground line optimization device 10 of the present disclosure may also include resistors R4, R5 and capacitor C1 to inject compensation current into the ground line network. Among them, the current transformer L1 is responsible for detecting the common-mode current on the power line. R4 and C1 constitute a high-frequency filtering unit to filter the current output by the current transformer L1, which is then amplified by the second operational amplifier U3-A and input to the ground line control device U1. The compensation current to be reversely injected is calculated with reference to formula (5). After the compensation current is calculated, the ground line control device U1 outputs the compensation current through the DAC pin (pin 1), thereby reducing the ground line noise.

[0153] In some embodiments of the present disclosure, reverse injection refers to: the direction of the compensation current is opposite to the detected common-mode noise current, and noise suppression is achieved through active cancellation.

[0154] In some embodiments of the present disclosure, Figure 2 and Figure 5 As shown, the current transformer L1 captures the common-mode noise current I cm ; Ground control device U1 combined with ground impedance Z g and ground potential difference V gnd , the compensation current I is generated by formula (5) comp ;Then the DAC output is converted into a high-precision reverse current through the second operational amplifier U3-A (inverting amplification); the reverse current is injected into the ground network to directly neutralize the common-mode noise energy.

[0155] Figure 6 Schematic diagrams of some other embodiments of the ground wire control system disclosed herein. Figure 6 As shown, the multi-node ground network of the present disclosure includes multiple devices, such as Figure 3 and Figure 6 As shown, the ground wire control system includes a ground wire control device U1 and a ground wire network dynamic switching device 20.

[0156] The ground network dynamic switching device 20 is configured to control each device in the plurality of devices to be connected to the ground network of the device according to the instruction of the ground control device, and to control the ground network of each device to be connected to the earth network of the device.

[0157] The ground line control device U1 is configured to obtain the ground line impedance of each device; and take the ground network with the minimum ground line impedance as the target ground network.

[0158] In some embodiments of the present disclosure, the ground network focuses on local electromagnetic compatibility and suppresses noise through dynamic adjustment.

[0159] In some embodiments of the present disclosure, the earth network focuses on global safety and low-frequency grounding, but cannot solve the high-frequency noise problem.

[0160] In some embodiments of the present disclosure, Figure 1 and Figure 3 As shown in the figure, high-frequency switching power supplies and other devices generate wide-spectrum noise during operation. If all devices share a unified ground network, the noise will be coupled to other devices (especially weak current systems such as CAN and RS-485) through the ground wire, resulting in an increase in communication bit error rate.

[0161] In some embodiments of the present disclosure, an independent ground network (device ground layer) is designed for each device, which can confine high-frequency noise to a local range and avoid global coupling.

[0162] The inventors discovered through research that in actual projects, equipment is physically dispersed and the grounding resistance of the grounding points may vary. If unified grounding is forced, the ground potential difference (due to differences in ground impedance) will form a ground loop, exacerbating common-mode interference.

[0163] In some embodiments of the present disclosure, by configuring an independent ground network and earth network for each device, the main control unit (U1) can monitor the impedance of each node in real time and dynamically select the optimal grounding path (such as the ground network with the least noise) instead of relying on a single grounding path.

[0164] The inventors have discovered through research that ideally, all devices should be connected to a unified earth network (physical grounding body) to provide a zero potential reference point and ensure safety.

[0165] However, in actual engineering application scenarios: when equipment is dispersed in different locations, factors such as the length of the grounding wire and soil resistivity cause the potential of each grounding point to be inconsistent; in a high-frequency environment, the ground wire exhibits inductive impedance. Even if the physical connection is unified, the ground potential of different nodes may still fluctuate due to differences in current paths; forced unified grounding may form a large-scale ground loop (especially building wiring), which may become a source of antenna effect and couple spatial electromagnetic interference.

[0166] The above-mentioned embodiments of the present disclosure provide a method and system for dynamic switching of a multi-node ground network based on ground quality assessment. First, current injection is performed to measure the impedance of the ground network of each device to determine the signal quality of the ground network of each device. Then, dynamic switching of the multi-node ground network is performed. The ground control device U1 compares the impedance of the ground network of each device with the communication status of each device, and connects the ground networks of all devices to the target earth network with minimal interference.

[0167] The above-mentioned embodiments of the present disclosure can accurately identify the ground network with the least interference and complete dynamic switching of the ground network by measuring parameters such as ground impedance and voltage difference, thereby achieving optimal connection of the ground network and improving the reliability of system communication.

[0168] In some embodiments of the present disclosure, the ground network dynamic switching device 20 may also be configured to control the ground network of each device to be connected to the target earth network according to instructions of the ground control device.

[0169] The above-mentioned embodiment of the present disclosure connects the ground network of all devices to the ground network with the least interference, while cutting off the connection of other devices to the ground network, thereby forming a unified grounding architecture, thereby achieving optimized connection of the ground network and improving the reliability of system communication.

[0170] In some embodiments of the present disclosure, Figure 6 As shown, the ground network dynamic switching device includes a first relay group K1 and a second relay group K2.

[0171] The first relay group K1 includes a first relay provided between the ground network of each device and the earth network of the device.

[0172] The second relay group K2 has a second relay provided between each two adjacent ground network outlets.

[0173] In some embodiments of the present disclosure, the ground wire control device U1 can also be configured to control the connection of the ground wire network of each device with the earth network of the device by closing all relays in the first relay group and disconnecting all relays in the second relay group; and control the connection of the ground wire network of each device to the target earth network by closing all relays in the second relay group, closing the target relay between the target earth network and the ground wire network of the device corresponding to the target earth network, and disconnecting other relays in the first relay group except the target relay.

[0174] The above embodiments of the present disclosure can achieve connection between the ground network of each device and the earth network of the device by controlling the first relay group and the second relay group.

[0175] The above embodiment of the present disclosure connects the ground network of each device to the earth network of the device by controlling the first relay group and the second relay group, thereby conveniently achieving dynamic switching of multi-node ground networks and maintaining the stability of the ground network.

[0176] Therefore, the above embodiments of the present disclosure can conveniently form a unified grounding architecture, thereby achieving an optimized connection of the ground network and improving the reliability of system communication.

[0177] In some embodiments of the present disclosure, Figure 6 As shown, the dynamic switching of the multi-node ground network consists of a first relay group K1 and a second relay group K2. Relays are deployed at the ground network outlets of each device to form the first relay group K1, which is then connected to the earth network of each device. At the same time, relays are reserved between the ground networks of each device to form the second relay group K2. During the ground quality assessment process, first, all relay groups K1 are energized and all relay groups K2 are disconnected. The ground network of each device is connected to its own earth network. The ground detection module performs impedance detection on the ground network of each device. The master control U1 will compare and select a ground network with lower ground network impedance as the preferred ground network. Assuming that this preferred ground network is connected to its earth network through K1_2, the master control relay group K1 will disconnect all relays except K1_2, and all relay groups K2 will be energized, connecting the ground networks of all devices to the ground network with the least interference. At the same time, the connection of other devices to the earth network is cut off, forming a unified grounding architecture.

[0178] In some embodiments of the present disclosure, the ground control device U1 can also be configured to take the device corresponding to the smallest ground impedance as the target device; obtain the common-mode current on the power line of the ground network of the target device; determine the target compensation current of the target device based on the common-mode current and the ground impedance; and control the target compensation current to be injected into the ground network of each device.

[0179] The above-mentioned embodiments of the present disclosure are developed to address the noise interference problem generated by high-frequency switching power supplies in building automation systems. Intelligent sensing technology is used to monitor the dynamic changes of ground impedance in real time. Parameters such as the equipment ground impedance and voltage difference are comprehensively considered to achieve switching of the ground network of each device. At the same time, impedance compensation is performed on the equipment ground network, effectively overcoming the ground noise coupling problem.

[0180] The above-mentioned embodiments of the present disclosure are developed to address the noise interference problem generated by high-frequency switching power supplies in building automation systems. Intelligent sensing technology is used to monitor the dynamic changes of ground impedance in real time. Parameters such as the equipment ground impedance and voltage difference are comprehensively considered to achieve switching of the ground network of each device. At the same time, impedance compensation is performed on the equipment ground network, effectively overcoming the ground noise coupling problem.

[0181] The above-mentioned embodiments of the present disclosure simultaneously achieve the optimized connection of the ground network and the current compensation of the target earth network, thereby improving the reliability of system communication and effectively eliminating the influence of noise on the ground network.

[0182] The above-mentioned embodiments of the present disclosure monitor ground status parameters in real time, coordinately adjust the dynamic switching of multi-node ground networks, and adopt a ground network compensation strategy to effectively suppress the noise interference of high-frequency switching power supplies, thereby ensuring the stable operation of the weak current control system.

[0183] In some embodiments of the present disclosure, the ground control device U1 can also be configured to determine whether there is ground network noise between the ground network of each device and the target earth network; in the absence of ground network noise, maintain the control of injecting the compensation current into the ground network of each device; in the presence of ground network noise, repeatedly perform the operations of controlling each device to be connected to the ground network of the device, controlling the ground network of each device to be connected to the earth network of the device, obtaining the ground impedance of each device, taking the earth network with the smallest ground impedance as the target earth network, controlling the ground network of each device to be connected to the target earth network, taking the device corresponding to the smallest ground impedance as the target device, obtaining the common-mode current on the power line of the ground network of the target device, determining the target compensation current of the target device based on the common-mode current and the ground impedance, controlling the target compensation current to be injected into the ground network of each device, and determining whether there is ground network noise between the ground network of each device and the target earth network.

[0184] The above-described embodiments of the present disclosure can cyclically determine whether ground network noise exists between each device's ground network and the target earth network. Thus, by dynamically evaluating the ground network switching mechanism, the above-described embodiments of the present disclosure ensure the optimality of each device's ground network connection and the long-term stability of the system, thereby improving the reliability of system communications and effectively eliminating the impact of noise on the ground network.

[0185] If the above embodiment of the present disclosure determines that there is no ground network noise, the current output by the DAC is maintained to keep the ground network stable. If there is ground network noise, the ground network of each device is reconnected to its own earth network, and then current is injected into its ground network, impedance measurement is performed, and the signal quality of the ground network of each device is determined. The multi-node ground network is dynamically switched again, and this process is repeated to maintain the stability of the ground network.

[0186] Figure 7 Schematic diagram of some embodiments of the ground line control method disclosed herein. Figure 7 The embodiment can be executed by the ground line control device or the ground line control system of the present disclosure. Figure 7 As shown, Figure 7 The method of the embodiment may include at least one of steps 100 to 400 .

[0187] In step 100 , a ground impedance of a device is obtained, wherein the device is connected to a ground network of the device, and the ground network of the device is connected to an earth network of the device.

[0188] In some embodiments of the present disclosure, step 100 may include at least one of steps 110 to 130 .

[0189] In step 110 , a detection current is controlled to be injected into the ground network of the device.

[0190] In some embodiments of the present disclosure, step 110 may include at least one of steps 111 to 113 .

[0191] In step 111 , the detection current is injected into the ground network of the device through an injection resistor.

[0192] In step 112, the injection resistor voltage is collected.

[0193] In step 113, a detection current value is determined according to the injection resistor voltage and the resistance value of the injection resistor.

[0194] The above-mentioned embodiment of the present disclosure cooperates with the injection resistor and the ground wire control device to accurately determine the detection current value according to the injection resistor voltage and the resistance value of the injection resistor. Therefore, the ground wire impedance of the equipment can be accurately calculated by detecting the current value and the voltage difference between the ground wire network and the earth network, and then the compensation current can be accurately calculated, thereby effectively eliminating the influence of noise on the ground wire network.

[0195] In some embodiments of the present disclosure, step 110 may include: collecting the injection resistor voltage V according to formula (2) DAC According to the injection resistance voltage V DAC and the resistance value of the injection resistor R1 inj , determine the detection current value I inj .

[0196] In step 120, an original pressure difference between the ground network of the device and the earth network of the device is obtained.

[0197] In some embodiments of the present disclosure, step 120 may include at least one of steps 121 to 123 .

[0198] In step 121 , the original voltage difference is amplified by a first operational amplifier.

[0199] In step 122 , the amplified original voltage difference is collected as a collected voltage value.

[0200] In step 123, the original voltage difference is determined according to the collected voltage value and the amplification factor of the first operational amplifier.

[0201] The above-mentioned embodiment of the present disclosure amplifies the voltage difference between the ground network and the earth network through the first operational amplifier. Through the cooperation of the first operational amplifier and the ground control device, the voltage difference between the ground network and the earth network can be determined more conveniently and accurately. Therefore, the ground impedance of the equipment can be accurately calculated by detecting the current value and the voltage difference between the ground network and the earth network, and then the compensation current can be accurately calculated, thereby effectively eliminating the influence of noise on the ground network.

[0202] In some embodiments of the present disclosure, step 120 may include: collecting the amplified original voltage difference as the collected voltage value V measured According to formula (3), according to the collected voltage value V measured and the amplification factor A1 of the first operational amplifier, determine the original voltage difference V drop .

[0203] In step 130 , the ground impedance of the device is determined according to the detected current value and the original voltage difference.

[0204] The above-mentioned embodiments of the present disclosure detect the current value and the voltage difference between the ground network and the earth network, thereby accurately calculating the ground impedance of the device, and then accurately calculating the compensation current, thereby effectively eliminating the influence of noise on the ground network.

[0205] In some embodiments of the present disclosure, step 120 may include: according to formula (1), according to the injected detection current value I inj and the original pressure difference V drop , determine the ground impedance of the device.

[0206] In step 200, a common mode current on a power line of a ground network of the device is obtained.

[0207] In some embodiments of the present disclosure, step 200 may include at least one of steps 210 to 240 .

[0208] In step 210 , a common mode current on the power line is detected by a current transformer.

[0209] In step 220, the common-mode current is amplified by a second operational amplifier.

[0210] In step 230 , the amplified common-mode current is collected as a collected current value.

[0211] In step 240, the common mode current is determined according to the collected current value and the amplification factor of the second operational amplifier.

[0212] The above-mentioned embodiment of the present disclosure discloses a dynamically optimized noise compensation method and system, which uses a current transformer to surround the power line to detect the common-mode current, combines it with the ground network impedance for analysis, calculates the compensation current, and injects the compensation current into the ground line in a manner with opposite polarity, thereby effectively eliminating the impact of noise on the ground network.

[0213] In step 300, a compensation current of the device is determined according to the common mode current and the ground line impedance.

[0214] In some embodiments of the present disclosure, step 300 may include at least one of step 310 and step 320 .

[0215] In step 310 , a ground potential difference is obtained.

[0216] In step 320, the compensation current is determined according to the ground line impedance, the compensation coefficient, the ground potential difference, and the common mode current.

[0217] The above-mentioned embodiments of the present disclosure can accurately calculate the compensation current based on the ground impedance, compensation coefficient, ground potential difference and the common-mode current, and reversely inject the compensation current into the ground network to neutralize the common-mode noise energy, thereby effectively eliminating the impact of noise on the ground network.

[0218] In some embodiments of the present disclosure, step 300 may include: according to formula (5), according to the ground line impedance Z g , compensation coefficient k, the ground potential difference V gnd and the common mode current I cm , determine the compensation current I comp .

[0219] In step 400, the compensation current is controlled to be injected into the ground network of the device.

[0220] The above-mentioned embodiments of the present disclosure can effectively eliminate ground loop coupling by determining the compensation current of the device based on the common-mode current and the ground line impedance, significantly reducing noise interference during system operation, thereby reducing system instability problems caused by ground potential differences and common-mode coupling, and ensuring the long-term stable operation of the device in complex and changeable electromagnetic environments.

[0221] The above-mentioned embodiments of the present disclosure solve the technical problem that in a complex electromagnetic environment, traditional noise suppression methods cannot avoid ground impedance changes, and are prone to generating noise due to ground impedance differences and common-mode current coupling, resulting in reduced system stability.

[0222] Figure 8 Schematic diagram of some embodiments of the ground line control method disclosed herein. Figure 8The embodiment can be executed by the ground line control device of the present disclosure or the ground line control system of the present disclosure. In some embodiments of the present disclosure, the multi-node ground line network includes multiple devices. Figure 8 As shown, Figure 8 The method of the embodiment may include at least one of steps 801 to 804 .

[0223] In step 801, for each device among a plurality of devices, each device is controlled to be connected to a ground network of the device, and the ground network of each device is controlled to be connected to an earth network of the device.

[0224] In some embodiments of the present disclosure, in step 801, the step of controlling the connection between the ground network of each device and the earth network of the device may include: controlling the connection between the ground network of each device and the earth network of the device by closing all relays in a first relay group and opening all relays in a second relay group, wherein a first relay is set between the ground network of each device and the earth network of the device, and a second relay is set between the outlets of every two adjacent ground networks, such as Figure 6 shown.

[0225] In step 802, for each device, the step of obtaining the ground impedance of the device is performed, that is, performing Figure 7 Step 100 of the embodiment.

[0226] In step 803, the earth network with the minimum ground line impedance is used as the target earth network.

[0227] In step 804 , the ground network of each device is controlled to be connected to the target earth network.

[0228] The above-mentioned embodiments of the present disclosure provide a method and system for compensating common-mode current of a ground network, and a method and system for dynamically switching a multi-node ground network.

[0229] The above-mentioned embodiments of the present disclosure provide a method and system for dynamic switching of a multi-node ground network based on ground quality assessment. First, current injection is performed to measure the impedance of the ground network of each device to determine the signal quality of the ground network of each device. Then, dynamic switching of the multi-node ground network is performed. The ground control device U1 compares the impedance of the ground network of each device with the communication status of each device, and connects the ground networks of all devices to the target earth network with minimal interference.

[0230] The above embodiments of the present disclosure solve the technical problem that in a multi-node ground network, due to the complexity of interference sources and the difficulty in effectively evaluating the interference situation of the multi-node ground network, it is impossible to dynamically switch to a ground network node with a low interference level.

[0231] The above-mentioned embodiments of the present disclosure can accurately identify the ground network with the least interference and complete dynamic switching of the ground network by measuring parameters such as ground impedance and voltage difference, thereby achieving optimal connection of the ground network and improving the reliability of system communication.

[0232] In some embodiments of the present disclosure, step 804 may include at least one of steps 8041 to 8042 .

[0233] In step 8041, the ground network of each device is controlled to be disconnected from the earth network of the device.

[0234] In step 8042, the ground network of each device is controlled to be connected to the target earth network.

[0235] The above-mentioned embodiment of the present disclosure connects the ground network of all devices to the ground network with the least interference, while cutting off the connection of other devices to the ground network, thereby forming a unified grounding architecture, thereby achieving optimized connection of the ground network and improving the reliability of system communication.

[0236] In some embodiments of the present disclosure, step 804 may include: controlling the ground network of each device to be connected to the target earth network by closing all relays in the second relay group, closing the target relay between the target earth network and the ground network of the device corresponding to the target earth network, and disconnecting other relays in the first relay group except the target relay, wherein a first relay is set between the ground network of each device and the earth network of the device, and a second relay is set between the outlets of every two adjacent ground networks.

[0237] The above embodiments of the present disclosure can achieve connection between the ground network of each device and the earth network of the device by controlling the first relay group and the second relay group.

[0238] The above embodiment of the present disclosure connects the ground network of each device to the earth network of the device by controlling the first relay group and the second relay group, thereby conveniently achieving dynamic switching of multi-node ground networks and maintaining the stability of the ground network.

[0239] Therefore, the above embodiments of the present disclosure can conveniently form a unified grounding architecture, thereby achieving an optimized connection of the ground network and improving the reliability of system communication.

[0240] Figure 9 Schematic diagrams of some further embodiments of the ground line control method disclosed herein. Figure 9 The embodiments may be executed by the ground line control apparatus or the ground line control system of the present disclosure. In some embodiments of the present disclosure, a multi-node ground line network includes a plurality of devices. Figure 9The method of the embodiment may include Figure 8 In addition to at least one step from step 801 to step 804, the embodiment may further include at least one step from step 805 to step 808.

[0241] In step 805, the device corresponding to the minimum ground line impedance is used as the target device.

[0242] In step 806 , a common mode current on a power line of a ground network of the target device is obtained.

[0243] In step 807 , a target compensation current of the target device is determined according to the common mode current and the ground line impedance.

[0244] In step 808 , the target compensation current is controlled to be injected into the ground network of each device.

[0245] The above-mentioned embodiments of the present disclosure simultaneously achieve the optimized connection of the ground network and the current compensation of the target earth network, thereby improving the reliability of system communication and effectively eliminating the influence of noise on the ground network.

[0246] The above-mentioned embodiments of the present disclosure monitor ground status parameters in real time, coordinately adjust the dynamic switching of multi-node ground networks, and adopt a ground network compensation strategy to effectively suppress the noise interference of high-frequency switching power supplies, thereby ensuring the stable operation of the weak current control system.

[0247] In some embodiments of the present disclosure, Figure 9 The method of the embodiment may include Figure 8 In addition to at least one step from step 801 to step 808, the embodiment may further include at least one step from step 809 to step 810.

[0248] In step 809, it is determined whether ground network noise exists between the ground network of each device and the target earth network. If ground network noise does not exist, step 810 is executed. If ground network noise exists, steps 801 to 809 are repeated, that is, the steps of controlling the connection of each device to the ground network of the device, controlling the connection of the ground network of each device to the earth network of the device, obtaining the ground impedance of each device, selecting the earth network with the smallest ground impedance as the target earth network, controlling the connection of the ground network of each device to the target earth network, selecting the device with the smallest ground impedance as the target device, obtaining the common-mode current on the power line of the ground network of the target device, determining the target compensation current of the target device based on the common-mode current and the ground impedance, controlling the injection of the target compensation current into the ground network of each device, and determining whether ground network noise exists between the ground network of each device and the target earth network are repeated.

[0249] In step 810 , the compensation current is injected into the ground network of each device under control.

[0250] The above-described embodiments of the present disclosure can cyclically determine whether ground network noise exists between each device's ground network and the target earth network. Thus, by dynamically evaluating the ground network switching mechanism, the above-described embodiments of the present disclosure ensure the optimality of each device's ground network connection and the long-term stability of the system, thereby improving the reliability of system communications and effectively eliminating the impact of noise on the ground network.

[0251] The above-mentioned embodiment of the present disclosure first performs current injection, measures the impedance of the ground network of each device, determines the signal quality of the ground network of each device, and then performs dynamic switching of the multi-node ground network. The ground control device U1 compares the impedance of the ground network of each device with the communication status of each device, connects the ground network of all devices to the ground network with the least interference, and at the same time cuts off the connection of other devices to the ground network to form a unified grounding architecture; then the ground optimization module calculates the compensation current that needs to be reversely injected, measures the common-mode current, and combines it with the current caused by the ground potential difference. After superposition, a new DAC output current is generated, which is reversely injected into the ground network to offset the common-mode noise in the ground loop. In an ideal state, when the voltage difference between the ground network and the ground network is zero, the ground noise is effectively suppressed. The above-mentioned embodiment of the present disclosure then continues to judge the quality of the ground network. If it is determined that there is no ground network noise, the current output by the DAC is continued to be maintained to keep the ground network stable. If there is ground network noise, the ground network of each device is reconnected to its own earth network, and then current is injected into its ground network, and impedance measurement is performed to judge the signal quality of the ground network of each device, and dynamic switching of the multi-node ground network is performed again. This process is repeated to maintain the stability of the ground network.

[0252] Figure 9 Schematic diagram of the structure of some embodiments of the ground wire control device disclosed in the present invention. Figure 3 As shown, the ground line control device of the present disclosure may include an impedance acquisition module 91 , a common mode current acquisition module 92 , a compensation current determination module 93 and a compensation current injection module 94 .

[0253] The impedance acquisition module 91 is configured to acquire the ground impedance of a device, wherein the device is connected to a ground network of the device, and the ground network of the device is connected to an earth network of the device.

[0254] In some embodiments of the present disclosure, the impedance acquisition module 91 can be configured to control the detection current to be injected into the ground network of the device; obtain the original voltage difference between the ground network of the device and the earth network of the device; and determine the ground impedance of the device based on the detection current value and the original voltage difference.

[0255] In some embodiments of the present disclosure, the impedance acquisition module 91 can be configured to inject the detection current into the ground network of the device through an injection resistor when controlling the detection current to be injected into the ground network of the device; collect the injection resistor voltage; and determine the detection current value based on the injection resistor voltage and the resistance value of the injection resistor.

[0256] In some embodiments of the present disclosure, the impedance acquisition module 91 can be configured to amplify the original pressure difference between the ground network of the device and the earth network of the device through a first operational amplifier when obtaining the original pressure difference between the ground network of the device and the earth network of the device; collect the amplified original pressure difference as a collected voltage value; and determine the original pressure difference based on the collected voltage value and the amplification factor of the first operational amplifier.

[0257] The common mode current acquisition module 92 is configured to acquire the common mode current on the power line of the ground network of the device.

[0258] In some embodiments of the present disclosure, the common-mode current acquisition module 92 can be configured to detect the common-mode current on the power line through a current transformer; amplify the common-mode current through a second operational amplifier; collect the amplified common-mode current as a collected current value; and determine the common-mode current based on the collected current value and the amplification factor of the second operational amplifier.

[0259] The compensation current determination module 93 is configured to determine the compensation current of the device according to the common mode current and the ground line impedance.

[0260] In some embodiments of the present disclosure, the compensation current determination module 93 may be configured to obtain a ground potential difference; and determine the compensation current according to the ground line impedance, the compensation coefficient, the ground potential difference, and the common mode current.

[0261] The compensation current injection module 94 is configured to control the injection of the compensation current into the ground network of the device.

[0262] In some embodiments of the present disclosure, a multi-node ground network includes multiple devices. The ground control device of the present disclosure can also be configured to control the connection between each device and the ground network of the device, and control the connection between the ground network of each device and the earth network of the device; for each device, perform the operation of obtaining the ground impedance of the device; take the earth network with the smallest ground impedance as the target earth network; and control the ground network of each device to be connected to the target earth network.

[0263] In some embodiments of the present disclosure, the ground wire control device of the present disclosure can be configured to control the ground wire network of each device to disconnect from the earth network of the device; and control the ground wire network of each device to be connected to the target earth network.

[0264] In some embodiments of the present disclosure, the ground control device of the present disclosure can also be configured to take the device corresponding to the smallest ground impedance as the target device; obtain the common-mode current on the power line of the ground network of the target device; determine the target compensation current of the target device based on the common-mode current and the ground impedance; and control the target compensation current to be injected into the ground network of each device.

[0265] In some embodiments of the present disclosure, the ground control device of the present disclosure can also be configured to determine whether there is ground network noise between the ground network of each device and the target earth network; in the absence of ground network noise, maintain the control of injecting the compensation current into the ground network of each device; in the presence of ground network noise, repeatedly perform the operations of controlling the connection of each device to the ground network of the device, controlling the connection of the ground network of each device to the earth network of the device, obtaining the ground impedance of each device, taking the earth network with the smallest ground impedance as the target earth network, controlling the ground network of each device to be connected to the target earth network, taking the device corresponding to the smallest ground impedance as the target device, obtaining the common-mode current on the power line of the ground network of the target device, determining the target compensation current of the target device based on the common-mode current and the ground impedance, controlling the target compensation current to be injected into the ground network of each device, and determining whether there is ground network noise between the ground network of each device and the target earth network.

[0266] In some embodiments of the present disclosure, the ground wire control device of the present disclosure can be configured to control the connection between the ground wire network of each device and the earth network of the device by closing all relays in the first relay group and opening all relays in the second relay group, wherein a first relay is set between the ground wire network of each device and the earth network of the device, and a second relay is set between the outlets of every two adjacent ground wire networks.

[0267] In some embodiments of the present disclosure, the ground wire control device of the present disclosure can be configured to control the ground wire network of each device to be connected to the target earth network by closing all relays in the second relay group, closing the target relay between the target earth network and the ground wire network of the device corresponding to the target earth network, and disconnecting other relays except the target relay in the first relay group, wherein a first relay is set between the ground wire network of each device and the earth network of the device, and a second relay is set between the outlets of every two adjacent ground wire networks.

[0268] In some embodiments of the present disclosure, the ground line control device of the present disclosure may also be configured to implement the ground line control method as described in any of the above embodiments.

[0269] Figure 10 Schematic diagram of the structure of some other embodiments of the ground wire control device disclosed in the present invention. Figure 10 As shown, the ground line control device disclosed herein may include a memory 101 and a processor 102 .

[0270] The memory 101 is used to store instructions. The processor 102 is coupled to the memory 101 . The processor 102 is configured to execute the ground line control method involved in the above embodiment based on the instructions stored in the memory.

[0271] like Figure 10 As shown, the ground wire control device further includes a communication interface 103 for exchanging information with other devices and a bus 104 through which the processor 102, the communication interface 103, and the memory 101 communicate with each other.

[0272] Memory 101 may include high-speed RAM memory or non-volatile memory, such as at least one disk storage device. Memory 101 may also be a memory array. Memory 101 may also be divided into blocks, and the blocks may be combined into virtual volumes according to certain rules.

[0273] Furthermore, the processor 102 may be a central processing unit (CPU), or may be an application-specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiments of the present disclosure.

[0274] According to another aspect of the present disclosure, a computer program product is provided, comprising a computer program, wherein when the computer program is executed by a processor, the ground line control method as described in any one of the above embodiments is implemented.

[0275] According to another aspect of the present disclosure, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and when the instructions are executed by a processor, the ground line control method as described in any of the above embodiments is implemented.

[0276] The computer-readable storage medium of the present disclosure may be implemented as a non-transitory computer-readable storage medium.

[0277] Those skilled in the art will appreciate that embodiments of the present disclosure may be provided as methods, apparatus, or computer program products. Therefore, the present disclosure may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present disclosure may take the form of a computer program product implemented on one or more computer-usable non-transient storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0278] The present disclosure is described with reference to flowcharts and / or block diagrams of methods, devices (systems) and computer program products according to embodiments of the present disclosure. It should be understood that each process and / or block in the flowchart and / or block diagram and the combination of processes and / or blocks in the flowchart and / or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0279] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0280] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0281] The ground line control device, impedance acquisition module, common-mode current acquisition module, compensation current determination module and compensation current injection module described above can be implemented as a general-purpose processor, programmable logic controller, digital signal processor (DSP), application-specific integrated circuit (ASIC), field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component or any appropriate combination thereof for performing the functions described in the present disclosure.

[0282] Those skilled in the art will appreciate that all or part of the steps of the above-described embodiment methods of the present disclosure may be accomplished by hardware, and the hardware may be implemented as a general-purpose processor, a programmable logic controller, a digital signal processor, an application-specific integrated circuit, a field programmable gate array or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, or any appropriate combination thereof for executing the methods described in the present disclosure.

[0283] The present disclosure has been described in detail so far. To avoid obscuring the concept of the present disclosure, some details known in the art have not been described. Based on the above description, those skilled in the art can fully understand how to implement the technical solutions disclosed herein.

[0284] Those skilled in the art will understand that all or part of the steps to implement the above embodiments may be accomplished by hardware, or may be accomplished by instructing the relevant hardware through a program, and the program may be stored in a non-transitory computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a disk or an optical disk, etc.

[0285] The description of the present disclosure is provided for purposes of illustration and description and is not intended to be exhaustive or to limit the disclosure to the disclosed form. Many modifications and variations will be apparent to those skilled in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present disclosure and to enable those skilled in the art to understand the present disclosure and design various embodiments with various modifications suitable for specific applications.

Claims

1. A ground line control method, comprising: obtaining a ground impedance of a device, wherein the device is connected to a ground network of the device, and the ground network of the device is connected to an earth network of the device; Obtain the common mode current on the power line of the ground network of the device; determining a compensation current of the device according to the common mode current and the ground line impedance; The compensation current is controlled to be injected into the ground network of the device.

2. The ground line control method according to claim 1, wherein: Obtaining the ground impedance of the device includes: Control the detection current injected into the ground network of the device; Obtaining the original voltage difference between the ground network of the device and the earth network of the device; The ground impedance of the device is determined according to the detected current value and the original voltage difference.

3. The ground line control method according to claim 2, wherein: The ground network that controls the sense current injected into the device consists of: Injecting the detection current into the ground network of the device through an injection resistor; Collect the injected resistor voltage; The detection current value is determined according to the injection resistor voltage and the resistance value of the injection resistor.

4. The ground line control method according to claim 2 or 3, wherein: Obtaining the original voltage difference between the ground network of the device and the earth network of the device includes: amplifying the original voltage difference by a first operational amplifier; Collect the amplified original voltage difference as the collected voltage value; The original voltage difference is determined according to the collected voltage value and the amplification factor of the first operational amplifier.

5. The ground line control method according to any one of claims 1 to 3, wherein: The common mode current on the power line that gets the ground network of the device includes: Detect the common mode current on the power line through the current transformer; amplifying the common-mode current by a second operational amplifier; collecting the amplified common-mode current as a collected current value; The common-mode current is determined according to the collected current value and the amplification factor of the second operational amplifier.

6. The ground line control method according to any one of claims 1 to 3, wherein: Determining the compensation current of the device according to the common mode current and the ground line impedance includes: Get the ground potential difference; The compensation current is determined according to the ground line impedance, the compensation coefficient, the ground potential difference and the common mode current.

7. The ground line control method according to any one of claims 1 to 3, wherein: The multi-node ground wire network includes a plurality of devices, and the method further includes: For each of the plurality of devices, controlling the connection of each device to a ground network of the device, and controlling the connection of the ground network of each device to an earth network of the device; For each of the devices, performing the step of obtaining the ground impedance of the device; The earth network with the smallest ground impedance is taken as the target earth network; Control the ground network of each device to be connected to the target earth network.

8. The ground line control method according to claim 7, wherein: Controlling the connection of each device's ground network to the target earth network includes: Control the ground network of each device to be disconnected from the earth network of the device; Control the ground network of each device to be connected to the target earth network.

9. The ground line control method according to claim 7, wherein: Also includes: The device with the smallest ground impedance is selected as the target device; Obtaining a common-mode current on a power line of a ground network of the target device; determining a target compensation current of the target device according to the common mode current and the ground impedance; The target compensation current is controlled to be injected into the ground network of each device.

10. The ground line control method according to claim 9, wherein: Also includes: Determining whether there is ground network noise between the ground network of each device and the target earth network; In the absence of ground network noise, maintaining control of injecting the compensation current into the ground network of each device; In the presence of ground network noise, the steps of controlling the connection between each device and the ground network of the device, controlling the connection between the ground network of each device and the earth network of the device, obtaining the ground impedance of each device, using the earth network with the smallest ground impedance as the target earth network, controlling the ground network of each device to be connected to the target earth network, using the device corresponding to the smallest ground impedance as the target device, obtaining the common-mode current on the power line of the ground network of the target device, determining the target compensation current of the target device based on the common-mode current and the ground impedance, controlling the target compensation current to be injected into the ground network of each device, and determining whether there is ground network noise between the ground network of each device and the target earth network.

11. The ground line control method according to claim 7, wherein: The ground network that controls each device is connected to the earth network of the device, including: By closing all relays in the first relay group and opening all relays in the second relay group, the ground network of each device is controlled to be connected to the earth network of the device, wherein a first relay is provided between the ground network of each device and the earth network of the device, and a second relay is provided between the outlets of every two adjacent ground networks; By closing all relays in the second relay group, closing the target relay between the target earth network and the ground network of the device corresponding to the target earth network, and disconnecting other relays except the target relay in the first relay group, the ground network of each device is controlled to be connected to the target earth network.

12. A ground wire control device, comprising: an impedance acquisition module configured to acquire a ground impedance of a device, wherein the device is connected to a ground network of the device, and the ground network of the device is connected to an earth network of the device; a common-mode current acquisition module, configured to acquire a common-mode current on a power line of a ground network of the device; a compensation current determination module, configured to determine a compensation current of the device according to the common mode current and the ground line impedance; The compensation current injection module is configured to control the compensation current to be injected into the ground network of the device.

13. A ground wire control device, comprising: Memory; as well as A processor coupled to the memory, wherein the processor is configured to execute the ground line control method according to any one of claims 1 to 11 based on instructions stored in the memory.

14. A ground wire control system, comprising: a ground line optimization device configured to collect a common mode current on a power line of a ground line network of the device and send the common mode current to a ground line control device; The ground control device according to claim 12 or 13, configured to obtain a ground impedance of a device, wherein the device is connected to a ground network of the device, and the ground network of the device is connected to an earth network of the device; and determine a compensation current of the device according to the common-mode current and the ground impedance; The ground wire detection device is configured to inject a compensation current into the ground wire network of the equipment according to the instruction of the ground wire control device.

15. The ground wire control system according to claim 14, wherein: The ground wire detection device comprises: a current injection module configured to inject a detection current into the ground network of the device according to an instruction of the ground control device; a ground voltage acquisition module configured to acquire an original voltage difference between the ground network of the device and the earth network of the device when the current injection module injects the detection current into the ground network of the device, and send the original voltage difference to the ground control device; The ground wire control device is further configured to determine the ground wire impedance of the device according to the detected current value and the original voltage difference.

16. The ground wire control system according to claim 15, wherein: The current injection module includes: an injection resistor configured to inject the detection current into a ground network of the device; The ground wire control device is further configured to collect the injection resistor voltage; and determine the detection current value according to the injection resistor voltage and the resistance value of the injection resistor.

17. The ground wire control system according to claim 15 or 16, wherein: The ground voltage acquisition module includes: a first operational amplifier configured to amplify an original voltage difference between the ground network of the device and the earth network of the device; The ground wire control device is further configured to collect the amplified original voltage difference as a collected voltage value; and determine the original voltage difference according to the collected voltage value and the amplification factor of the first operational amplifier.

18. The ground wire control system according to any one of claims 14 to 16, wherein: The ground line optimization device comprises: a current transformer configured to detect a common-mode current on the power line; a second operational amplifier configured to amplify the common-mode current; The ground wire control device is further configured to collect the amplified common-mode current as a collected current value; and determine the common-mode current according to the collected current value and the amplification factor of the second operational amplifier.

19. The ground wire control system according to any one of claims 14 to 16, wherein: The multi-node ground wire network includes multiple devices, and the ground wire control system also includes: a ground network dynamic switching device configured to control, for each of the plurality of devices, the connection between each device and the ground network of the device, and to control the connection between the ground network of each device and the earth network of the device, according to an instruction of the ground control device; The ground line control device is further configured to obtain the ground line impedance of each device; and take the ground network with the smallest ground line impedance as the target ground network; The ground network dynamic switching device is further configured to control the ground network of each device to be connected to the target earth network according to the instruction of the ground control device.

20. The ground wire control system according to claim 19, wherein: The ground network dynamic switching device includes: a first relay group, wherein a first relay is provided between the ground network of each device and the earth network of the device; and The second relay group has a second relay set between each two adjacent ground network outlets. Among them, the ground wire control device is also configured to control the ground wire network of each device to be connected to the earth network of the device by closing all relays in the first relay group and disconnecting all relays in the second relay group; and control the ground wire network of each device to be connected to the target earth network by closing all relays in the second relay group, closing the target relay between the target earth network and the ground wire network of the device corresponding to the target earth network, and disconnecting other relays in the first relay group except the target relay.

21. A computer-readable storage medium, wherein: The computer-readable storage medium stores computer instructions, and when the instructions are executed by a processor, the ground wire control method according to any one of claims 1 to 11 is implemented.

22. A computer program product comprising a computer program, wherein When the computer program is executed by a processor, the ground line control method according to any one of claims 1 to 11 is implemented.

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