Method and device for detecting reliability of alternating current power supply ground and alternating current charging pile equipment

Abstract

The application is suitable for the technical field of power supply, and provides an alternating current power supply ground reliability detection method, device and alternating current charging pile equipment. The alternating current power supply ground reliability detection method comprises the following steps: acquiring a first voltage of a fire line to ground, a second voltage of a zero line to ground and a third voltage of the fire line to the zero line; determining the type of a power supply system based on the sum of the first voltage and the second voltage; if the type is a single-phase power supply system, determining the ground reliability based on the minimum value of the first voltage and the second voltage; if the type is a two-phase power supply system, determining the rated power supply voltage of the two-phase power supply system based on the phase difference of the first voltage and the second voltage; if it is a first rated voltage, determining the ground reliability based on the difference between the first voltage and the second voltage; if it is a second rated voltage, determining the ground reliability based on the first voltage, the second voltage and the third voltage. It is suitable for various types of household alternating current power supply systems, and improves the detection efficiency of alternating current power supply ground reliability.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of power supply, and particularly relates to a detection method and device for AC power supply grounding reliability and an AC charging pile equipment. BACKGROUND

[0002] In a household power supply system (i.e. residential power supply system), if the power supply circuit is not reliably grounded, the user will be in danger of electric shock when the power supply equipment is subject to electric leakage. Therefore, it is necessary to detect the grounding reliability of the power supply circuit. At present, the household AC power supply system under the American standard (American power supply standard) usually includes single-phase power supply and two-phase power supply, wherein the rated power supply voltage of the single-phase power supply is 120V, and the rated power supply voltage of the two-phase power supply includes 240V and 208V.

[0003] However, the existing detection method for AC power supply grounding reliability is only applicable to a certain type of AC power supply system (such as only applicable to a single-phase power supply system, only applicable to a two-phase power supply system with a rated power supply voltage of 240V, or only applicable to a two-phase power supply system with a rated power supply voltage of 208V), thereby resulting in a small applicable range of the detection method for AC power supply grounding reliability. In addition, the type of the AC power supply system needs to be matched with the detection method for AC power supply grounding reliability before the detection, thereby reducing the detection efficiency of the detection for AC power supply grounding reliability. SUMMARY

[0004] Therefore, the embodiments of the present application provide a detection method and device for AC power supply grounding reliability and an AC charging pile equipment to solve the technical problem of small applicable range and low detection efficiency of the existing detection method for AC power supply grounding reliability.

[0005] In a first aspect, the embodiments of the present application provide a detection method for AC power supply grounding reliability, which comprises: acquiring a first voltage of a hot line to ground, a second voltage of a zero line to ground, and a third voltage of the hot line to the zero line;

[0006] determining a type of a power supply system based on a sum of the first voltage and the second voltage; the type of the power supply system includes a single-phase power supply system and a two-phase power supply system;

[0007] if the type of the power supply system is the single-phase power supply system, determining a grounding reliability of the single-phase power supply system based on a minimum value of the first voltage and the second voltage; the grounding reliability includes reliable grounding and unreliable grounding;

[0008] if the type of the power supply system is the two-phase power supply system, determining a rated power supply voltage of the two-phase power supply system based on a phase difference between the first voltage and the second voltage; the rated power supply voltage comprises a first rated voltage and a second rated voltage;

[0009] if the rated power supply voltage is the first rated voltage, determining a ground reliability of the two-phase power supply system based on a difference between the first voltage and the second voltage;

[0010] if the rated power supply voltage is the second rated voltage, determining the ground reliability of the two-phase power supply system based on the first voltage, the second voltage and the third voltage.

[0011] In an optional implementation of the first aspect, the determining the type of the power supply system based on the sum of the first voltage and the second voltage comprises:

[0012] if the sum of the first voltage and the second voltage is greater than a first preset voltage threshold, determining that the type of the power supply system is the single-phase power supply system;

[0013] if the sum of the first voltage and the second voltage is less than or equal to the first preset voltage value, determining that the type of the power supply system is the two-phase power supply system.

[0014] In an optional implementation of the first aspect, the determining the ground reliability of the single-phase power supply system based on the minimum value of the first voltage and the second voltage comprises:

[0015] if the minimum value of the first voltage and the second voltage is less than a second preset voltage threshold, determining that the single-phase power supply system is reliably grounded;

[0016] if the minimum value of the first voltage and the second voltage is greater than or equal to the second preset voltage threshold, determining that the single-phase power supply system is not reliably grounded.

[0017] In an optional implementation of the first aspect, the determining the rated power supply voltage of the two-phase power supply system based on the phase difference between the first voltage and the second voltage comprises:

[0018] if the phase difference between the first voltage and the second voltage is a first preset phase difference, determining that the rated power supply voltage of the two-phase power supply system is the first rated voltage; the first preset phase difference is 180 degrees, and the first rated voltage is 240 volts;

[0019] If a phase difference between the first voltage and the second voltage is a second preset phase difference, it is determined that a rated supply voltage of the two-phase supply system is the second rated voltage; the second preset phase difference is 120 degrees, and the second rated voltage is 208 volts.

[0020] In an optional implementation of the first aspect, the determining the ground reliability of the two-phase supply system based on the difference between the first voltage and the second voltage comprises:

[0021] If the difference between the first voltage and the second voltage is less than a third preset voltage threshold, it is determined that the two-phase supply system is reliably grounded.

[0022] If the difference between the first voltage and the second voltage is greater than or equal to the third preset voltage threshold, it is determined that the two-phase supply system is not reliably grounded.

[0023] In an optional implementation of the first aspect, the determining the ground reliability of the two-phase supply system based on the first voltage, the second voltage and the third voltage comprises:

[0024] determining a target voltage based on a sum of the first voltage and the second voltage;

[0025] If a difference between the third voltage and the target voltage is less than a fourth preset voltage threshold, it is determined that the two-phase supply system is reliably grounded.

[0026] If the difference between the third voltage and the target voltage is greater than or equal to the fourth preset voltage threshold, it is determined that the two-phase supply system is not reliably grounded.

[0027] In an optional implementation of the first aspect, after determining that the type of the supply system is the two-phase supply system, before determining the rated supply voltage of the two-phase supply system based on the phase difference between the first voltage and the second voltage, the method further comprises:

[0028] obtaining a plurality of first sampling values of the first voltage in one complete sinusoidal period, and storing the plurality of first sampling values in a first array;

[0029] obtaining a plurality of second sampling values of the second voltage in one complete sinusoidal period, and storing the plurality of second sampling values in a second array;

[0030] obtaining a first array address of a minimum value in the plurality of first sampling values and a second array address of a minimum value in the plurality of second sampling values;

[0031] if the first array address is same as the second array address, determining that a phase difference between the first voltage and the second voltage is a first preset phase difference;

[0032] if the first array address is not same as the second array address, determining that the phase difference between the first voltage and the second voltage is a second preset phase difference.

[0033] In a second aspect, an embodiment of the present application provides an alternating current power supply grounding reliability detection device, comprising:

[0034] a first obtaining unit, configured to obtain a first voltage of a live wire to ground, a second voltage of a zero wire to ground, and a third voltage of the live wire to the zero wire;

[0035] a first determining unit, configured to determine a type of a power supply system based on a sum of the first voltage and the second voltage; the type of the power supply system comprises a single-phase power supply system and a two-phase power supply system;

[0036] a second determining unit, if the type of the power supply system is the single-phase power supply system, configured to determine a grounding reliability of the single-phase power supply system based on a minimum value of the first voltage and the second voltage; the grounding reliability comprises reliable grounding and unreliable grounding;

[0037] a third determining unit, if the type of the power supply system is the two-phase power supply system, configured to determine a rated power supply voltage of the two-phase power supply system based on a phase difference between the first voltage and the second voltage; the rated power supply voltage comprises a first rated voltage and a second rated voltage;

[0038] a fourth determining unit, if the rated power supply voltage is the first rated voltage, configured to determine the grounding reliability of the two-phase power supply system based on a difference between the first voltage and the second voltage;

[0039] a fifth determining unit, if the rated power supply voltage is the second rated voltage, configured to determine the grounding reliability of the two-phase power supply system based on the first voltage, the second voltage and the third voltage.

[0040] In a third aspect, an embodiment of the present application provides an alternating current power supply grounding reliability detection device, comprising a memory, a processor, and a computer program stored in the memory and capable of running on the processor, and the processor implements the steps of any optional mode of the first aspect when executing the computer program.

[0041] In a fourth aspect, an embodiment of the present application provides an alternating current charging pile device, comprising a voltage detection device and the alternating current power supply grounding reliability detection device of the second aspect or the third aspect, and the voltage detection device is connected with the alternating current power supply grounding reliability detection device.

[0042] In a fifth aspect, the embodiments of the present application provide a computer program product, which, when running on the detection device for AC power supply grounding reliability, enables the detection device for AC power supply grounding reliability to perform the method according to the first aspect or any possible implementation of the first aspect.

[0043] The detection method and device for AC power supply grounding reliability and the AC charging pile device provided by the embodiments of the present application have the following beneficial effects:

[0044] The detection method for AC power supply grounding reliability provided by the embodiments of the present application obtains the first voltage between the live wire and the ground, the second voltage between the zero wire and the ground, and the third voltage between the live wire and the zero wire, determines the type of the power supply system based on the sum of the first voltage and the second voltage, determines the AC power supply grounding reliability based on the minimum value of the first voltage and the second voltage if the type of the power supply system is a single-phase power supply system, determines the rated power supply voltage of the two-phase power supply system based on the phase difference between the first voltage and the second voltage if the type of the power supply system is a two-phase power supply system, determines the AC power supply grounding reliability based on the difference between the first voltage and the second voltage if the rated power supply voltage of the two-phase power supply system is the first rated voltage, and determines the AC power supply grounding reliability based on the first voltage, the second voltage, and the third voltage if the rated power supply voltage of the two-phase power supply system is the second rated voltage. Since the detection method for AC power supply grounding reliability provided by the embodiments of the present application can determine the type of the power supply system first, and then use different detection methods to detect the grounding reliability of the AC power supply for different types of power supply systems, the method can be applied to various types of household AC power supply systems, thereby expanding the application range of the detection method for AC power supply grounding reliability. Therefore, when detecting the AC power supply grounding reliability, it is not necessary to match the type of the AC power supply system with the detection method for AC power supply grounding reliability, and the detection efficiency of the AC power supply grounding reliability is improved. BRIEF DESCRIPTION OF DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative labor.

[0046] Figure 1 A structural schematic diagram of an AC charging pile device is provided for the embodiments of the present application;

[0047] Figure 2 An implementation flowchart of a detection method for AC power supply grounding reliability is provided for the embodiments of the present application;

[0048] Figure 3 A structural schematic diagram of an alternating current power supply grounding reliability detection device provided by an embodiment of the present application is shown in FIG. 1.

[0049] Figure 4 A structural schematic diagram of an alternating current power supply grounding reliability detection device provided by an embodiment of the present application is shown in FIG. 1. DETAILED DESCRIPTION

[0050] It should be noted that the terms used in the embodiments of the present application are only used to explain the embodiments of the present application, and are not intended to limit the present application. In the description of the embodiments of the present application, unless otherwise specified, "a plurality of" means two or more than two, "at least one", "one or more" means one, two or more than two. The terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more features.

[0051] In the present specification, the reference to "one embodiment" or "some embodiments" and the like means that the specific features, structures or characteristics described in connection with the embodiment are included in one or more embodiments of the present application. Therefore, the statements "in one embodiment", "in some embodiments", "in other some embodiments", "in other some embodiments" and the like appearing in the present specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized. The terms "include", "contain", "have" and their variants mean "include but not limited to", unless otherwise specifically emphasized.

[0052] The alternating current power supply grounding reliability detection method provided by the embodiments of the present application can be applied in an alternating current charging pile device. Please refer to Figure 1 A structural schematic diagram of an alternating current charging pile device provided by an embodiment of the present application is shown in FIG. 1. As shown in Figure 1 The alternating current charging pile device 10 can include a voltage detection device 11, an alternating current power supply grounding reliability detection device 12 and an alternating current charging device 13.

[0053] The voltage detection device 11 is connected with the alternating current power supply ground reliability detection device 12. The voltage detection device 11 is used for detecting a first voltage of a live wire to ground, a second voltage of a zero wire to ground, and a third voltage of the live wire to the zero wire, and sending the first voltage, the second voltage, and the third voltage to the alternating current power supply ground reliability detection device 12. The alternating current power supply ground reliability detection device 12 is used for performing ground reliability detection on the alternating current power supply based on the first voltage, the second voltage, and the third voltage. The specific detection process can refer to the related description in the subsequent method embodiment, which is not described here in detail. The alternating current charging device 13 is used for realizing the charging function of the alternating current charging pile device 10.

[0054] Based on the alternating current charging pile device provided in the above embodiment, the embodiment of the present application further provides a detection method for alternating current power supply ground reliability applied to the alternating current charging pile device. The execution subject of the detection method can be the alternating current power supply ground reliability detection device in the alternating current charging pile device. Specifically, the detection method can be used for real-time detection of the ground reliability of the alternating current charging pile device. Since different power supply systems used in different alternating current charging pile devices in actual application can be different types of alternating current power supply systems under the American standard, the detection method is specifically used for detecting the ground reliability of various types of household alternating current power supply systems under the American standard. The household alternating current power supply system under the American standard usually includes a single-phase power supply system and a two-phase power supply system. The rated power supply voltage of the single-phase power supply system is usually 120 volts (V), and the rated power supply voltage of the two-phase power supply system usually includes 240V and 208V.

[0055] Please refer to Figure 2 An implementation flowchart of the detection method for alternating current power supply ground reliability provided in the embodiment of the present application can include S201-S206, which are described in detail as follows.

[0056] In S201, a first voltage of a live wire to ground, a second voltage of a zero wire to ground, and a third voltage of the live wire to the zero wire are obtained.

[0057] When it is necessary to detect the ground reliability of the alternating current power supply, the alternating current power supply ground reliability detection device can obtain the first voltage of the live wire to ground, the second voltage of the zero wire to ground, and the third voltage of the live wire to the zero wire detected by the voltage detection device at the current time. The current time can be the time when the alternating current power supply ground reliability detection instruction is received. The alternating current power supply ground reliability detection instruction can be triggered by a user.

[0058] In S202, the type of the power supply system is determined based on the sum of the first voltage and the second voltage.

[0059] In the embodiments of the present application, the type of the power supply system can include a single-phase power supply system and a two-phase power supply system.

[0060] In a possible implementation, the alternating current power supply ground reliability detection device can determine the type of the power supply system based on the sum of the first voltage and the second voltage at the current moment. Specifically, the alternating current power supply ground reliability detection device can compare the sum of the first voltage and the second voltage at the current moment with a first preset voltage threshold. When the sum of the first voltage and the second voltage at the current moment is greater than the first preset voltage threshold, the alternating current power supply ground reliability detection device can determine that the type of the power supply system is the single-phase power supply system. When the sum of the first voltage and the second voltage at the current moment is less than or equal to the first preset voltage threshold, the alternating current power supply ground reliability detection device can determine that the type of the power supply system is the two-phase power supply system.

[0061] The first preset voltage threshold can be obtained by experimental analysis in advance, and the method for obtaining the first preset voltage threshold and the specific value are not particularly limited here. For example, the first preset voltage threshold can be 150 V. Based on this, when the sum of the first voltage and the second voltage at the current moment is greater than 150 V, the alternating current power supply ground reliability detection device can determine that the type of the power supply system is the single-phase power supply system. When the sum of the first voltage and the second voltage at the current moment is less than or equal to 150 V, the alternating current power supply ground reliability detection device can determine that the type of the power supply system is the two-phase power supply system.

[0062] In S203, if the type of the power supply system is the single-phase power supply system, the ground reliability of the single-phase power supply system is determined based on the minimum value of the first voltage and the second voltage.

[0063] In the embodiments of the present application, the ground reliability of the power supply system includes reliable ground and unreliable ground.

[0064] The reliable ground is used to describe that the power supply system is connected with the ground, and the unreliable ground is used to describe that the power supply system is not connected with the ground.

[0065] In a possible implementation, after determining that the type of the power supply system is the single-phase power supply system, the AC power supply ground reliability detection apparatus can determine the ground reliability of the single-phase power supply system based on the minimum value of the first voltage and the second voltage at the current moment. Specifically, the AC power supply ground reliability detection apparatus can compare the minimum value of the first voltage and the second voltage at the current moment with the second preset voltage threshold. When the minimum value of the first voltage and the second voltage at the current moment is less than the second preset voltage threshold, the AC power supply ground reliability detection apparatus can determine that the single-phase power supply system is reliably grounded. When the minimum value of the first voltage and the second voltage at the current moment is greater than or equal to the second preset voltage threshold, the AC power supply ground reliability detection apparatus can determine that the single-phase power supply system is not reliably grounded.

[0066] The second preset voltage threshold can be obtained through experimental analysis in advance, and the method for obtaining the second preset voltage threshold and the specific value are not particularly limited here. For example, the second preset voltage threshold can be 30 V. Based on this, when the minimum value of the first voltage and the second voltage at the current moment is less than 30 V, the AC power supply ground reliability detection apparatus can determine that the single-phase power supply system is reliably grounded. When the minimum value of the first voltage and the second voltage at the current moment is greater than or equal to 30 V, the AC power supply ground reliability detection apparatus can determine that the single-phase power supply system is not reliably grounded.

[0067] In S204, if the type of the power supply system is the two-phase power supply system, the rated power supply voltage of the two-phase power supply system is determined based on the phase difference between the first voltage and the second voltage.

[0068] The rated power supply voltage in the embodiments of the application can include a first rated voltage and a second rated voltage.

[0069] After determining that the type of the power supply system is the two-phase power supply system, the AC power supply ground reliability detection apparatus can first determine the phase difference between the first voltage and the second voltage at the current moment, and then determine the rated power supply voltage of the two-phase power supply system based on the phase difference between the first voltage and the second voltage at the current moment. The phase difference between the first voltage and the second voltage is used to describe the phase difference between the live wire and the neutral wire, and the phase difference between the first voltage and the second voltage can include 120 degrees and 180 degrees. When the phase difference between the first voltage and the second voltage is 120 degrees, it indicates that the phase difference between the live wire and the neutral wire is 120 degrees. When the phase difference between the first voltage and the second voltage is 180 degrees, it indicates that the phase difference between the live wire and the neutral wire is 180 degrees.

[0070] Specifically, the alternating current power supply ground reliability detection device can compare the phase difference between the first voltage and the second voltage at the current moment with the first preset phase difference and the second preset phase difference. When the phase difference between the first voltage and the second voltage at the current moment is the first preset phase difference, the alternating current power supply ground reliability detection device can determine that the rated supply voltage of the two-phase power supply system is the first rated voltage; when the phase difference between the first voltage and the second voltage at the current moment is the second preset phase difference, the alternating current power supply ground reliability detection device can determine that the rated supply voltage of the two-phase power supply system is the second rated voltage.

[0071] Since the rated supply voltage of the two-phase power supply system usually includes 240V and 208V in the household alternating current power supply system under the American standard, in a possible implementation, the first rated voltage can be 240V, and the second rated voltage can be 208V. Based on this, when the phase difference between the first voltage and the second voltage at the current moment is 180 degrees, the alternating current power supply ground reliability detection device can determine that the rated supply voltage of the two-phase power supply system is 240V; when the phase difference between the first voltage and the second voltage at the current moment is 120 degrees, the alternating current power supply ground reliability detection device can determine that the rated supply voltage of the two-phase power supply system is 208V.

[0072] In a possible implementation, the alternating current power supply ground reliability detection device can determine the phase difference between the first voltage and the second voltage at the current moment by the following steps:

[0073] Step a: obtaining a plurality of first sampling values of the first voltage in a complete sinusoidal period, and storing the plurality of first sampling values in a first array.

[0074] In the present implementation, the voltage detection device can detect the first voltage between the live wire and the ground in real time, and send the first sampling value of the first voltage detected at each moment to the alternating current power supply ground reliability detection device. After receiving the first sampling value of the first voltage at each moment, the alternating current power supply ground reliability detection device can store the first sampling value of the first voltage at each moment in the storage unit of the alternating current power supply ground reliability detection device. The alternating current power supply ground reliability detection device can obtain a plurality of first sampling values of the first voltage in a complete sinusoidal period closest to the current moment from the storage unit, and store all the first sampling values in the sinusoidal period obtained in the first array. Based on this, each first sampling value in the first array corresponds to a first array address.

[0075] Step b: obtaining a plurality of second sampling values of the second voltage in a complete sinusoidal period, and storing the plurality of second sampling values in a second array.

[0076] In the present implementation, the voltage detection device can detect the second voltage between the zero line and the ground in real time, and send the second sampling value of the second voltage detected at each moment to the AC power supply ground reliability detection device. After receiving the second sampling value of the second voltage at each moment, the AC power supply ground reliability detection device can store the second sampling value of the second voltage at each moment in the storage unit of the AC power supply ground reliability detection device. The AC power supply ground reliability detection device can obtain a plurality of second sampling values of the second voltage in a complete sinusoidal period closest to the current moment from the storage unit, and store all the second sampling values in the sinusoidal period in the second array. Based on this, each second sampling value in the second array corresponds to a second array address.

[0077] Step c: obtaining the first array address of the minimum value of the plurality of first sampling values and the second array address of the minimum value of the plurality of second sampling values.

[0078] In the present implementation, the AC power supply ground reliability detection device can compare each first sampling value in the first array with each other to determine the minimum value of the plurality of first sampling values in the first array, and obtain the first array address of the minimum value of the first sampling value. Similarly, the AC power supply ground reliability detection device can compare each second sampling value in the second array with each other to determine the minimum value of the plurality of second sampling values in the second array, and obtain the second array address of the minimum value of the second sampling value.

[0079] After the AC power supply ground reliability detection device obtains the first array address of the minimum value of the first sampling value and the second array address of the minimum value of the second sampling value, the AC power supply ground reliability detection device can compare the first array address of the minimum value of the first sampling value with the second array address of the minimum value of the second sampling value.

[0080] When the first array address of the minimum value of the first sampling value is the same as the second array address of the minimum value of the second sampling value, the AC power supply ground reliability detection device can perform step d; when the first array address of the minimum value of the first sampling value is different from the second array address of the minimum value of the second sampling value, the AC power supply ground reliability detection device can perform step e.

[0081] Step d: if the first array address and the second array address are the same, it is determined that the phase difference between the first voltage and the second voltage is a first preset phase difference.

[0082] When the first array address of the minimum value in the first sampling value is the same as the second array address of the minimum value in the second sampling value, it indicates that the position of the zero value in the first sampling value in a sine period is the same as the position of the zero value in the second sampling value in a sine period, and at this time, the alternating current power supply ground reliability detection device determines that the phase difference between the first voltage and the second voltage is a first preset phase difference (i.e. 180 degrees).

[0083] Step e: if the first array address is not the same as the second array address, it is determined that the phase difference between the first voltage and the second voltage is a second preset phase difference.

[0084] When the first array address of the minimum value in the first sampling value is not the same as the second array address of the minimum value in the second sampling value, it indicates that the position of the zero value in the first sampling value in a sine period is not the same as the position of the zero value in the second sampling value in a sine period, and at this time, the alternating current power supply ground reliability detection device determines that the phase difference between the first voltage and the second voltage is a second preset phase difference (i.e. 120 degrees).

[0085] In S205, if the rated power supply voltage is the first rated voltage, the ground reliability of the two-phase power supply system is determined based on the difference between the first voltage and the second voltage.

[0086] In the embodiments of the present application, after the alternating current power supply ground reliability detection device determines that the type of the power supply system is a two-phase power supply system and the rated power supply voltage of the two-phase power supply system is a first rated voltage (i.e. 240V), the ground reliability of the two-phase power supply system can be determined based on the difference between the first voltage and the second voltage at the current time, wherein the difference between the first voltage and the second voltage refers to the absolute value of the difference between the first voltage and the second voltage. Specifically, the alternating current power supply ground reliability detection device can compare the difference between the first voltage and the second voltage at the current time with a third preset voltage threshold. When the difference between the first voltage and the second voltage at the current time is less than the third preset voltage threshold, the alternating current power supply ground reliability detection device can determine that the two-phase power supply system is reliably grounded; when the difference between the first voltage and the second voltage at the current time is greater than or equal to the third preset voltage value, the alternating current power supply ground reliability detection device can determine that the two-phase power supply system is not reliably grounded.

[0087] The third preset voltage threshold can be obtained by prior experimental analysis, and the method of obtaining the third preset voltage threshold and the specific value are not limited herein. For example, the third preset voltage threshold can be 30V. Based on this, when the difference between the first voltage and the second voltage at the current time is less than 30V, the AC power supply grounding reliability detection device can determine that the two-phase power supply system is reliably grounded; when the difference between the first voltage and the second voltage at the current time is greater than or equal to 30V, the AC power supply grounding reliability detection device can determine that the two-phase power supply system is not reliably grounded.

[0088] In S206, if the rated supply voltage is the second rated voltage, the grounding reliability of the two-phase power supply system is determined based on the first voltage, the second voltage and the third voltage.

[0089] In a possible implementation, after determining that the type of the power supply system is a two-phase power supply system and the rated supply voltage of the two-phase power supply system is the second rated voltage (i.e., 208V), the AC power supply grounding reliability detection device can determine the grounding reliability of the two-phase power supply system based on the first voltage, the second voltage and the third voltage at the current time. Specifically, the AC power supply grounding reliability detection device can first determine a target voltage based on the sum of the first voltage and the second voltage, then calculate the difference between the third voltage at the current time and the target voltage, and then compare the difference between the third voltage at the current time and the target voltage with a fourth preset voltage threshold. The target voltage can be the product of the sum of the first voltage and the second voltage and the sine of 120 degrees, and the difference between the third voltage and the target voltage refers to the absolute value of the difference between the third voltage and the target voltage.

[0090] Specifically, when the difference between the third voltage at the current time and the target voltage is less than the fourth preset voltage threshold, the AC power supply grounding reliability detection device can determine that the two-phase power supply system is reliably grounded; when the difference between the third voltage at the current time and the target voltage is greater than or equal to the fourth preset voltage, the AC power supply grounding reliability detection device can determine that the two-phase power supply system is not reliably grounded.

[0091] The fourth preset voltage threshold can be obtained by prior experimental analysis, and the method of obtaining the fourth preset voltage threshold and the specific value are not particularly limited herein. For example, the fourth preset voltage threshold can be 30V. Based on this, when the difference between the third voltage at the current time and the target voltage is less than 30V, the AC power supply grounding reliability detection device can determine that the two-phase power supply system is reliably grounded; when the difference between the third voltage at the current time and the target voltage is greater than or equal to 30V, the AC power supply grounding reliability detection device can determine that the two-phase power supply system is not reliably grounded.

[0092] It can be seen from the above that the detection method for AC power supply grounding reliability provided in the embodiments of the present application can obtain the first voltage of the live wire to ground, the second voltage of the zero wire to ground, and the third voltage of the live wire to the zero wire, determine the type of the power supply system based on the sum of the first voltage and the second voltage, determine the AC power supply grounding reliability based on the minimum value of the first voltage and the second voltage if the type of the power supply system is a single-phase power supply system, determine the rated power supply voltage of the two-phase power supply system based on the phase difference between the first voltage and the second voltage if the type of the power supply system is a two-phase power supply system, determine the AC power supply grounding reliability based on the difference between the first voltage and the second voltage if the rated power supply voltage of the two-phase power supply system is the first rated voltage, and determine the AC power supply grounding reliability based on the first voltage, the second voltage, and the third voltage if the rated power supply voltage of the two-phase power supply system is the second rated voltage. Since the detection method for AC power supply grounding reliability provided in the embodiments of the present application can first determine the type of the power supply system, and then use different detection methods to detect the grounding reliability of the AC power supply for different types of power supply systems, the method can be applied to various types of household AC power supply systems, thereby expanding the application range of the detection method for AC power supply grounding reliability. Therefore, when detecting the grounding reliability of the AC power supply, it is not necessary to match the type of the AC power supply system with the detection method for AC power supply grounding reliability, and the detection efficiency of the grounding reliability of the AC power supply is improved.

[0093] It can be understood that the size of the serial number of each step in the above embodiments does not mean the order of execution, and the execution order of each process should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0094] Based on the detection method for AC power supply grounding reliability provided in the above embodiments, the embodiments of the present application further provide a detection device for the grounding reliability of the AC power supply implementing the above method embodiments. Please refer to Figure 3 , which is a structural schematic diagram of a detection device for the grounding reliability of the AC power supply provided in the embodiments of the present application. As Figure 3 shown, the detection device for the grounding reliability of the AC power supply 30 can include a first obtaining unit 31, a first determining unit 32, a second determining unit 33, a third determining unit 34, a fourth determining unit 35, and a fifth determining unit 36. Wherein:

[0095] The first obtaining unit 31 is configured to obtain the first voltage of the live wire to ground, the second voltage of the zero wire to ground, and the third voltage of the live wire to the zero wire.

[0096] The first determining unit 32 is configured to determine the type of the power supply system based on the sum of the first voltage and the second voltage; the type of the power supply system includes a single-phase power supply system and a two-phase power supply system.

[0097] The second determining unit 33 is configured to determine a ground reliability of the single-phase power supply system based on a minimum value of the first voltage and the second voltage if the type of the power supply system is the single-phase power supply system; the ground reliability comprises reliable ground and unreliable ground.

[0098] The third determining unit 34 is configured to determine a rated power supply voltage of the two-phase power supply system based on a phase difference between the first voltage and the second voltage if the type of the power supply system is the two-phase power supply system; the rated power supply voltage comprises a first rated voltage and a second rated voltage.

[0099] The fourth determining unit 35 is configured to determine a ground reliability of the two-phase power supply system based on a difference between the first voltage and the second voltage if the rated power supply voltage is the first rated voltage.

[0100] The fifth determining unit 36 is configured to determine a ground reliability of the two-phase power supply system based on the first voltage, the second voltage and the third voltage if the rated power supply voltage is the second rated voltage.

[0101] Optionally, the first determining unit 32 further comprises a sixth determining unit and a seventh determining unit. Wherein:

[0102] The sixth determining unit is configured to determine that the type of the power supply system is the single-phase power supply system if a sum of the first voltage and the second voltage is greater than a first preset voltage threshold.

[0103] The seventh determining unit is configured to determine that the type of the power supply system is the two-phase power supply system if the sum of the first voltage and the second voltage is less than or equal to the first preset voltage value.

[0104] Optionally, the second determining unit 33 further comprises an eighth determining unit and a ninth determining unit. Wherein:

[0105] The eighth determining unit is configured to determine that the single-phase power supply system is reliable ground if a minimum value of the first voltage and the second voltage is less than a second preset voltage threshold.

[0106] The ninth determining unit is configured to determine that the single-phase power supply system is unreliable ground if the minimum value of the first voltage and the second voltage is greater than or equal to the second preset voltage threshold.

[0107] Optionally, the third determining unit 34 further comprises a tenth determining unit and an eleventh determining unit. Wherein:

[0108] The tenth determining unit is configured to determine that the rated supply voltage of the dual-phase supply system is the first rated voltage if the phase difference between the first voltage and the second voltage is a first preset phase difference; the first preset phase difference is 180 degrees, and the first rated voltage is 240 volts.

[0109] The eleventh determining unit is configured to determine that the rated supply voltage of the dual-phase supply system is the second rated voltage if the phase difference between the first voltage and the second voltage is a second preset phase difference; the second preset phase difference is 120 degrees, and the second rated voltage is 208 volts.

[0110] Optionally, the fourth determining unit 35 further comprises a twelfth determining unit and a thirteenth determining unit. Wherein:

[0111] The twelfth determining unit is configured to determine that the dual-phase supply system is reliably grounded if the difference between the first voltage and the second voltage is less than a third preset voltage threshold.

[0112] The thirteenth determining unit is configured to determine that the dual-phase supply system is not reliably grounded if the difference between the first voltage and the second voltage is greater than or equal to the third preset voltage threshold.

[0113] Optionally, the fifth determining unit 36 further comprises a fourteenth determining unit, a fifteenth determining unit and a sixteenth determining unit. Wherein:

[0114] The fourteenth determining unit is configured to determine a target voltage based on the sum of the first voltage and the second voltage.

[0115] The fifteenth determining unit is configured to determine that the dual-phase supply system is reliably grounded if the difference between the third voltage and the target voltage is less than a fourth preset voltage threshold.

[0116] The sixteenth determining unit is configured to determine that the dual-phase supply system is not reliably grounded if the difference between the third voltage and the target voltage is greater than or equal to the fourth preset voltage threshold.

[0117] Optionally, the alternating current supply ground reliability detection device 30 further comprises a second obtaining unit, a third obtaining unit, a fourth obtaining unit, a seventeenth determining unit and an eighteenth determining unit, wherein:

[0118] The second obtaining unit is configured to obtain a plurality of first sampling values of the first voltage in a complete sinusoidal period, and store the plurality of first sampling values in a first array.

[0119] The third obtaining unit is configured to obtain a plurality of second sampling values of the second voltage in a complete sinusoidal period, and store the plurality of second sampling values in a second array.

[0120] The fourth obtaining unit is configured to obtain a first array address of a minimum value in the plurality of first sampling values and a second array address of a minimum value in the plurality of second sampling values.

[0121] The seventeenth determining unit is configured to determine that the phase difference between the first voltage and the second voltage is a first preset phase difference if the first array address is the same as the second array address.

[0122] The eighteenth determining unit is configured to determine that the phase difference between the first voltage and the second voltage is a second preset phase difference if the first array address is not the same as the second array address.

[0123] It should be noted that the information interaction and execution process between the above units are based on the same concept as the method embodiments of the present application, and the specific functions and technical effects brought by them can be referred to the method embodiments part, which will not be described here.

[0124] Please refer to Figure 4 , which is a structural schematic diagram of an alternating current power supply grounding reliability detection device provided by the embodiments of the present application. As shown in Figure 4 , the alternating current power supply grounding reliability detection device 4 provided by the embodiments of the present application can include a processor 40, a memory 41, and a computer program 42 stored in the memory 41 and executable on the processor 40, such as a program corresponding to the alternating current power supply grounding reliability detection method. The processor 40 implements the steps in the above-mentioned method embodiments applied to the alternating current power supply grounding reliability detection when executing the computer program 42, such as Figure 2 S201-S206 shown in the figure. Alternatively, the processor 40 implements the functions of each module / unit in the above-mentioned alternating current power supply grounding reliability detection device embodiments when executing the computer program 42, such as Figure 3 the functions of the units 31-36 shown in the figure.

[0125] For example, the computer program 42 can be divided into one or more modules / units, one or more modules / units are stored in the memory 41 and executed by the processor 40 to complete the present application. One or more modules / units can be a series of computer program instruction segments that can complete a specific function, which is used to describe the execution process of the computer program 42 in the alternating current power supply grounding reliability detection device 4. For example, the computer program 42 can be divided into a first reading unit, a second reading unit, and a read-write unit. The specific functions of each unit can be referred to the related description in the corresponding embodiments, which will not be described here. Figure 3

[0126] Those skilled in the art can understand that Figure 4 ​The AC power supply grounding reliability detection device 4 is only an example and does not constitute a limitation on the AC power supply grounding reliability detection device 4, which can include more or fewer components than shown, or combine certain components, or different components.

[0127] The processor 40 can be a central processing unit (CPU), and can also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor.

[0128] The memory 41 can be an internal storage unit of the AC power supply grounding reliability detection device 4, such as a hard disk or a memory of the AC power supply grounding reliability detection device 4. The memory 41 can also be an external storage device of the AC power supply grounding reliability detection device 4, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card or a flash card, etc. provided on the electronic device 4. Further, the memory 41 can include both the internal storage unit and the external storage device of the AC power supply grounding reliability detection device 4. The memory 41 is used to store computer programs and other programs and data required by the electronic device. The memory 41 can also be used to temporarily store data that has been output or will be output.

[0129] It can be clearly understood by those skilled in the art that, for the convenience and brevity of description, only the division of the above functional units is exemplified, and in actual application, the above functions can be completed by different functional units according to needs, that is, the internal structure of the power supply control device is divided into different functional units to complete all or part of the above described functions. Each functional unit in the embodiment can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit, and the integrated unit can be realized in the form of hardware or in the form of software functional unit. In addition, the specific names of each functional unit are only for easy distinction, and do not limit the protection scope of the present application. The specific working process of the unit in the above system can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

[0130] The embodiment of the present application further provides a computer readable storage medium, wherein a computer program is stored in the computer readable storage medium, and the computer program is executed by a processor to implement the steps in the method embodiments.

[0131] The embodiment of the present application provides a computer program product, when the computer program product is run on the detection device for reliability of AC power supply grounding, the detection device for reliability of AC power supply grounding implements the steps in the method embodiments.

[0132] In the above embodiments, the description of each embodiment has its own focus, and the parts not described or recorded in a certain embodiment can be referred to the relevant description of other embodiments.

[0133] Those skilled in the art can realize that the units and algorithm steps of the examples described in combination with the embodiments disclosed in the present application can be realized by electronic hardware or a combination of computer software and electronic hardware. Whether the functions are realized in hardware or software depends on the specific application and design constraints of the technical solutions. The skilled person can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0134] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalent ones; and these modifications or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. An alternating current power supply ground reliability detection method, characterized by, The method comprises: obtaining a first voltage between a live wire and ground, a second voltage between a neutral wire and ground, and a third voltage between the live wire and the neutral wire; determining a type of a power supply system based on a sum of the first voltage and the second voltage; the type of the power supply system comprises a single-phase power supply system and a two-phase power supply system; if the type of the power supply system is the single-phase power supply system, determining a ground reliability of the single-phase power supply system based on a minimum value of the first voltage and the second voltage; the ground reliability comprises reliable ground and unreliable ground; if the type of the power supply system is the two-phase power supply system, determining a rated power supply voltage of the two-phase power supply system based on a phase difference between the first voltage and the second voltage; the rated power supply voltage comprises a first rated voltage and a second rated voltage; if the rated power supply voltage is the first rated voltage, determining a ground reliability of the two-phase power supply system based on a difference between the first voltage and the second voltage; if the rated power supply voltage is the second rated voltage, determining a ground reliability of the two-phase power supply system based on the first voltage, the second voltage, and the third voltage; after determining that the type of the power supply system is the two-phase power supply system, before determining the rated power supply voltage of the two-phase power supply system based on the phase difference between the first voltage and the second voltage, the method further comprises: obtaining a plurality of first sampling values of the first voltage in a complete sine period, and storing the plurality of first sampling values in a first array; obtaining a plurality of second sampling values of the second voltage in the complete sine period, and storing the plurality of second sampling values in a second array; obtaining a first array address of a minimum value of the plurality of first sampling values and a second array address of a minimum value of the plurality of second sampling values; if the first array address is the same as the second array address, determining that the phase difference between the first voltage and the second voltage is a first preset phase difference; if the first array address is not the same as the second array address, determining that the phase difference between the first voltage and the second voltage is a second preset phase difference.

2. The method of claim 1, wherein, The determination of the type of the power supply system based on the sum of the first voltage and the second voltage comprises: if the sum of the first voltage and the second voltage is greater than a first preset voltage threshold, determining that the type of the power supply system is the single-phase power supply system; if the sum of the first voltage and the second voltage is less than or equal to the first preset voltage threshold, determining that the type of the power supply system is the two-phase power supply system.

3. The method of claim 1, wherein the method further comprises: The determination of the ground reliability of the single-phase power supply system based on the minimum value of the first voltage and the second voltage comprises: if the minimum value of the first voltage and the second voltage is less than a second preset voltage threshold, determining that the single-phase power supply system is reliable ground; if the minimum value of the first voltage and the second voltage is greater than or equal to the second preset voltage threshold, determining that the single-phase power supply system is unreliable ground.

4. The method of claim 1, wherein, The determination of the rated power supply voltage of the two-phase power supply system based on the phase difference between the first voltage and the second voltage comprises: If a phase difference between the first voltage and the second voltage is a first preset phase difference, it is determined that a rated supply voltage of the two-phase power supply system is the first rated voltage; the first preset phase difference is 180 degrees, and the first rated voltage is 240 volts. If the phase difference between the first voltage and the second voltage is a second preset phase difference, it is determined that the rated supply voltage of the two-phase power supply system is the second rated voltage; the second preset phase difference is 120 degrees, and the second rated voltage is 208 volts.

5. The method of claim 1, wherein, The ground reliability of the two-phase power supply system is determined based on the difference between the first voltage and the second voltage, including: If the difference between the first voltage and the second voltage is less than a third preset voltage threshold, it is determined that the two-phase power supply system is reliably grounded. If the difference between the first voltage and the second voltage is greater than or equal to the third preset voltage threshold, it is determined that the two-phase power supply system is not reliably grounded.

6. The method of AC supply ground reliability detection according to claim 1, wherein, The ground reliability of the two-phase power supply system is determined based on the first voltage, the second voltage, and the third voltage, including: A target voltage is determined based on the sum of the first voltage and the second voltage; If the difference between the third voltage and the target voltage is less than a fourth preset voltage threshold, it is determined that the two-phase power supply system is reliably grounded. If the difference between the third voltage and the target voltage is greater than or equal to the fourth preset voltage threshold, it is determined that the two-phase power supply system is not reliably grounded.

7. An apparatus for detecting reliability of AC supply ground, characterized by, Including: A first acquisition unit is configured to acquire a first voltage between a live wire and ground, a second voltage between a zero wire and ground, and a third voltage between the live wire and the zero wire; A first determination unit is configured to determine a type of a power supply system based on the sum of the first voltage and the second voltage; The type of the power supply system includes a single-phase power supply system and a two-phase power supply system; A second determination unit is configured to, if the type of the power supply system is the single-phase power supply system, determine a ground reliability of the single-phase power supply system based on a minimum value of the first voltage and the second voltage; the ground reliability includes reliable grounding and unreliable grounding; A third determination unit is configured to, if the type of the power supply system is the two-phase power supply system, determine a rated supply voltage of the two-phase power supply system based on a phase difference between the first voltage and the second voltage; the rated supply voltage includes a first rated voltage and a second rated voltage; A fourth determination unit is configured to, if the rated supply voltage is the first rated voltage, determine a ground reliability of the two-phase power supply system based on a difference between the first voltage and the second voltage; A fifth determination unit is configured to, if the rated supply voltage is the second rated voltage, determine the ground reliability of the two-phase power supply system based on the first voltage, the second voltage, and the third voltage; Further comprising a sixth determination unit, which is specifically configured to: Acquire a plurality of first sampling values of the first voltage in one complete sine period, and store the plurality of first sampling values in a first array; acquire a plurality of second sampling values of the second voltage in one complete sine cycle, and store the plurality of second sampling values in a second array; acquire a first array address of a minimum value in the plurality of first sampling values and a second array address of a minimum value in the plurality of second sampling values; if the first array address is same as the second array address, determine that a phase difference between the first voltage and the second voltage is a first preset phase difference; if the first array address is not same as the second array address, determine that the phase difference between the first voltage and the second voltage is a second preset phase difference.

8. An apparatus for detecting reliability of AC supply ground, characterized by A computer program product, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method according to any one of claims 1 to 6 when executing the computer program.

9. An alternating current charging station device, characterized in that An alternating current power supply ground reliability detection device, comprising a voltage detection device and the alternating current power supply ground reliability detection device according to claim 7 or 8, wherein the voltage detection device is connected to the alternating current power supply ground reliability detection device.

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