Charging data automatic calibration method, charging equipment and charging test system

Abstract

The present application provides a charging data automatic calibration method, a charging device and a charging test system, which belong to the field of automobile charging and discharging test technology. The method is applied to the charging device, and the charging device includes: a charging control module, an AC conversion module and a calibration module. The method includes: the charging control module converts the AC power signal input from the AC power grid into an actual electrical signal based on the AC conversion module; the calibration module determines the calibration information according to the actual electrical signal and the preset reference electrical signal, and sends it to the charging control module; the charging control module controls the AC conversion module according to the calibration information to compensate according to the calibration information during conversion. The present application can achieve the effect of improving the accuracy of charging data and enhancing the reliability of charging equipment.

Description

Technical Field

[0001] The present application relates to the technical field of automobile charging and discharging testing, and in particular to a charging data automatic calibration method, a charging device, and a charging testing system. Background Art

[0002] As an indispensable function of new energy vehicles, the verification test of charging and discharging function is very important for the normal operation of electric vehicles. However, during the actual charging and discharging test of electric vehicles, due to the matching problem of the simulation test system and the influence of the external environment, the voltage and current of the charging and discharging test will have error drift, which will affect the accuracy of the charging and discharging test results of electric vehicles. Therefore, there is an urgent need for an electric vehicle AC charging simulation test system that can be automatically calibrated to test the charging and discharging performance of the vehicle.

[0003] In the related technology, the electric vehicle AC charging and discharging simulation control system adopts a modular design, and the functions of each module are independent and coordinated with each other, which is convenient for the expansion of the electric vehicle AC charging and discharging simulation test system and ensures the flexibility of AC charging and discharging test. Among them, the electric vehicle AC charging and discharging simulation control system integrates the national standard test module and the abnormal case library module to achieve comprehensive coverage of the electric vehicle charging and discharging simulation test. In addition, the electric vehicle AC charging and discharging simulation control system is also equipped with a user editing test case module to maximize the flexibility and openness of the electric vehicle charging and discharging simulation test.

[0004] However, when conducting AC charging tests on electric vehicles based on relevant technologies, the electric vehicle AC charging and discharging test system does not have the calibration function of the charging voltage and current, and cannot calibrate the charging voltage and current of the electric vehicle in real time. The charging voltage and charging current will produce error drift, which will affect the accuracy of the electric vehicle charging and discharging simulation test results. Summary of the invention

[0005] The purpose of this application is to provide a charging data automatic calibration method, a charging device and a charging test system, which can improve the accuracy of charging data and enhance the reliability of the charging device.

[0006] The embodiment of the present application is implemented as follows:

[0007] In a first aspect of an embodiment of the present application, a charging data automatic calibration method is provided. The method is applied to a charging device, the charging device comprising: a charging control module, an AC conversion module and a calibration module. The method comprises:

[0008] The charging control module converts the AC power signal input from the AC power grid into an actual electrical signal based on the AC conversion module;

[0009] The calibration module determines calibration information according to the actual electrical signal and the preset reference electrical signal, and sends the calibration information to the charging control module;

[0010] The charging control module controls the AC conversion module to perform compensation according to the calibration information during conversion.

[0011] In a possible implementation, the calibration module includes: an AC calibration unit, the calibration module determines calibration information according to the actual electrical signal and the preset reference electrical signal, and sends the calibration information to the charging control module, including:

[0012] If the charging gun is connected to the AC charging port of the electric vehicle, the charging control module controls the AC conversion module to convert the AC power signal input from the AC power grid into an actual AC power signal;

[0013] The AC calibration unit collects the actual AC power signal in real time, determines the AC calibration information according to the actual AC power signal and the preset reference AC power signal, and sends it to the charging control module.

[0014] In a possible implementation, the calibration module further includes: a DC calibration unit, the calibration module determines calibration information according to the actual electrical signal and a preset reference electrical signal, and sends the calibration information to the charging control module, and further includes:

[0015] If the charging gun is connected to the DC charging port of the electric vehicle, the charging control module controls the AC conversion module to convert the AC power signal input from the AC power grid into an actual DC power signal;

[0016] The DC calibration unit collects the actual DC signal in real time, determines the DC calibration information according to the actual DC signal and the preset reference DC signal, and sends it to the charging control module.

[0017] In a possible implementation, the AC calibration unit includes: an AC voltage calibration component and an AC current calibration component. The AC calibration unit collects the actual AC signal in real time, determines the AC calibration information according to the actual AC signal and the preset reference AC signal, and sends it to the charging control module, including:

[0018] The charging control module controls the AC conversion module to convert the AC power signal input from the AC power grid into an actual AC voltage / current. The AC voltage / current calibration component collects the actual AC voltage / current in real time, and determines whether the actual AC voltage / current has an AC voltage / current drift based on the actual AC voltage / current and a preset reference AC voltage / current.

[0019] If so, the charging control module controls the AC conversion module to output multiple verification AC voltages / currents respectively, the AC voltage / current calibration component collects each verification AC voltage / current in real time, and determines the AC voltage / current calibration information based on each verification AC voltage / current and the preset reference AC voltage / current, and feeds it back to the charging control module.

[0020] In a possible implementation, the DC calibration unit includes: a DC voltage calibration component and a DC current calibration component. The DC calibration unit collects the actual DC signal in real time, determines the DC calibration information according to the actual DC signal and the preset reference DC signal, and sends it to the charging control module, including:

[0021] The charging control module controls the AC conversion module to convert the AC power signal input from the AC power grid into an actual DC voltage / current. The DC voltage / current calibration component collects the actual DC voltage / current in real time, and determines whether the actual DC voltage / current has a DC voltage / current drift based on the actual DC voltage / current and a preset reference DC voltage / current.

[0022] If so, the charging control module controls the AC conversion module to output multiple verification DC voltages / currents respectively, the DC voltage / current calibration component collects each verification DC voltage / current in real time, and determines the DC voltage / current calibration information based on each verification DC voltage / current and the preset reference DC voltage / current, and feeds it back to the charging control module.

[0023] In a possible implementation, the charging device further includes: an AC guiding unit and an AC guiding calibration unit, and the above charging data automatic calibration method further includes:

[0024] The AC pilot calibration unit is used to collect the AC pilot signal output by the AC pilot unit, and determine the AC pilot calibration information according to the AC pilot signal and the preset AC pilot signal, and feed it back to the charging control module. The charging control module controls the AC pilot unit according to the AC pilot calibration information to calibrate the AC pilot signal according to the AC pilot calibration information.

[0025] As a possible implementation, the charging device further includes: a DC guiding unit and a DC guiding calibration unit, and the above charging data automatic calibration method further includes:

[0026] The DC guidance calibration unit is used to collect the DC guidance signal output by the DC guidance unit in real time, determine the DC guidance calibration information according to the DC guidance signal and the preset DC guidance signal, and feed back the DC guidance calibration information to the charging control module. The charging control module controls the DC guidance unit according to the DC guidance calibration information to calibrate the DC guidance signal according to the DC guidance calibration information.

[0027] As a possible implementation, the charging device further includes: an auxiliary source unit and an auxiliary source calibration unit, and the above charging data automatic calibration method further includes:

[0028] The auxiliary source calibration unit is used to collect the positive auxiliary source voltage and the negative auxiliary source voltage output by the auxiliary source unit, and calculate the voltage difference between the positive auxiliary source voltage and the negative auxiliary source voltage;

[0029] The auxiliary source calibration unit determines the auxiliary source calibration information according to the voltage difference and the preset auxiliary source voltage difference, and feeds it back to the charging control module. The charging control module controls the auxiliary source unit to calibrate the positive auxiliary source voltage and the negative auxiliary source voltage according to the auxiliary source calibration information.

[0030] In a second aspect of an embodiment of the present application, a charging device is provided, the charging device comprising: a charging control module, an AC conversion module and a calibration module, wherein a first input end of the AC conversion module is used to access an AC power grid, the calibration module is connected to the AC conversion module, and the calibration module and the AC conversion module are both connected to the charging control module;

[0031] The charging control module is used to implement the steps of the charging data automatic calibration method described in the first aspect above.

[0032] According to a third aspect of an embodiment of the present application, a charging test system is provided, which includes: a control module and a communication module, the communication module communicates with an external device, and the control module is used to implement the automatic calibration method of charging data described in the first aspect above.

[0033] The beneficial effects of the embodiments of the present application include:

[0034] The embodiment of the present application provides a charging data automatic calibration method, wherein the charging control module converts the AC power input from the AC power grid into an actual electrical signal based on the control of the AC conversion module; the calibration module collects the actual electrical signal output by the AC conversion module in real time, and compares the actual electrical signal with a preset reference electrical signal. When it is determined that the actual electrical signal has voltage drift or current drift, the calibration information is calculated based on the actual electrical signal and the preset reference electrical signal, and fed back to the charging control module; the charging control module controls the AC conversion module according to the calibration information to compensate or calibrate the converted actual electrical signal according to the calibration information when performing the conversion. In this way, the accuracy of the charging data can be improved and the reliability of the charging equipment can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 A flowchart of a first charging data automatic calibration method provided in an embodiment of the present application;

[0037] Figure 2 A flowchart of a second charging data automatic calibration method provided in an embodiment of the present application;

[0038] Figure 3 A flowchart of a third charging data automatic calibration method provided in an embodiment of the present application;

[0039] Figure 4 A flowchart of a fourth charging data automatic calibration method provided in an embodiment of the present application;

[0040] Figure 5 A flowchart of a fifth charging data automatic calibration method provided in an embodiment of the present application;

[0041] Figure 6 A schematic diagram of the structure of a first charging device provided in an embodiment of the present application;

[0042] Figure 7 A schematic diagram of the structure of a calibration module provided in an embodiment of the present application;

[0043] Figure 8 A schematic diagram of the structure of a second charging device provided in an embodiment of the present application;

[0044] Fig. 9 A schematic diagram of the structure of a third charging device provided in an embodiment of the present application;

[0045] Fig.10 A schematic diagram of a structure of AC charging of a charging device provided in an embodiment of the present application;

[0046] Fig.11 A schematic diagram of a structure of DC charging of a charging device provided in an embodiment of the present application;

[0047] Fig.12 A flow chart of a method for automatic calibration of an AC charging process provided in an embodiment of the present application;

[0048] Fig.13 A flow chart of a method for automatic calibration of a DC charging process provided in an embodiment of the present application;

[0049] Fig.14 A schematic diagram of the structure of a charging test system provided in an embodiment of the present application.

[0050] Description of the drawings: 10: Charging device; 101: Charging control module; 1011: AC charging control unit; 1012: DC charging control unit; 102: AC conversion module; 1021: AC-AC conversion unit; 1022: AC-DC conversion unit; 103: Calibration module; 1031: AC calibration unit; 311: AC voltage calibration component; 312: AC current calibration component; 1032: DC calibration unit; 321: DC voltage calibration component; 322: DC current calibration component; 104: AC guidance unit; 105: AC guidance calibration unit; 106: DC guidance unit; 107: DC guidance calibration unit; 108: Auxiliary source unit; 109: Auxiliary source calibration unit; 20: Charging test system; 1401: Communication module; 1402: Control module. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0052] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0053] The following is a detailed explanation of the charging data automatic calibration method and the charging device provided in the embodiments of the present application in conjunction with the accompanying drawings.

[0054] Figure 1 This is a flowchart of a charging data automatic calibration method provided by this application, see Figure 1 The charging data automatic calibration method provided in the embodiment of the present application is applied to the charging device 10, see Figure 6The charging device 10 provided in the embodiment of the present application includes: a charging control module 101, an AC conversion module 102 and a calibration module 103, wherein the first input terminal of the AC conversion module 102 is used to access the AC power grid, the calibration module 103 is connected to the AC conversion module 102, and the calibration module 103 and the AC conversion module 102 are both connected to the charging control module 101. The charging device 10 can be a charging pile or a virtual electric vehicle charging and discharging simulation test system, which is not specifically limited in the present application. The charging data automatic calibration method provided in the embodiment of the present application includes:

[0055] S101. The charging control module converts the AC power signal input from the AC power grid into an actual electrical signal based on the AC conversion module.

[0056] Optionally, the actual electrical signal includes: an actual AC signal and an actual DC signal, wherein the actual AC signal is used to indicate the AC power actually outputted after the AC conversion module 102 converts the AC signal inputted from the AC power grid, and the actual AC signal includes both AC voltage and AC current. For example, if the charging control module 101 controls the AC conversion module 102 to convert the AC voltage inputted from the AC power grid into an AC voltage of 100V, but the AC voltage actually sent to the electric vehicle by the AC conversion module 102 after the conversion is only 99V, then the actual AC signal is 99V; for another example, if the charging control module 101 controls the AC conversion module 102 to convert the AC current inputted from the AC power grid into an AC current of 5A, and the AC current actually sent to the electric vehicle by the AC conversion module 102 after the conversion is 4A, then the actual AC signal is 4A.

[0057] Optionally, the actual DC signal is used to indicate the DC power actually output by the AC conversion module 102 after converting the AC signal input from the AC power grid, and the actual DC signal includes both DC voltage and DC current. For example, if the charging control module 101 controls the AC conversion module 102 to convert the AC voltage input from the AC power grid into a DC voltage of 500V, but the DC voltage actually sent to the electric vehicle by the AC conversion module 102 after the conversion is only 480V, then the actual DC signal is 480V; for another example, if the charging control module 101 controls the AC conversion module 102 to convert the AC current input from the AC power grid into a DC current of 5A, and the DC current actually sent to the electric vehicle by the AC conversion module 102 after the conversion is 4.5A, then the actual DC signal is 4.5A.

[0058] Optionally, the charging control module 101 controls the AC conversion module 102 to convert the AC power input from the AC power grid into an actual AC power signal or an actual DC power signal.

[0059] S102: The calibration module determines calibration information according to the actual electrical signal and a preset reference electrical signal, and sends the calibration information to the charging control module.

[0060] Optionally, the preset reference electrical signal includes: a preset reference AC signal and a preset reference DC signal, wherein the preset reference AC signal is an AC signal randomly set in advance by the charging control module 101, that is, the charging control module 101 expects the AC conversion module 102 to convert the AC signal input from the AC power grid into a target AC signal, such as the charging control module 101 controls the AC conversion module 102 to convert the AC signal input from the AC power grid into an AC voltage of 100V, then 100V is the reference AC voltage signal set by the charging control module 101; the preset reference DC signal is a DC signal randomly set in advance by the charging control module 101, that is, the charging control module 101 expects the AC conversion module 102 to convert the AC signal input from the AC power grid into a target DC signal, such as the charging control module 101 controls the AC conversion module 102 to convert the AC signal input from the AC power grid into a DC voltage of 500V, then 500V is the reference DC voltage signal set by the charging control module 101.

[0061] Optionally, the calibration module 103 acquires in real time the actual AC signal or the actual DC signal output by the AC conversion module 102, and the calibration module 103 determines the calibration information according to the voltage deviation or current deviation between the received actual AC signal and a preset reference AC signal, or according to the voltage deviation or current deviation between the received actual DC signal and a preset reference DC signal. The calibration information is used to indicate the voltage or current that the AC conversion module 102 needs to compensate for the converted electrical signal.

[0062] S103 , the charging control module controls the AC conversion module 102 to perform compensation according to the calibration information during conversion.

[0063] Optionally, the charging control module 101 controls the AC conversion module 102 according to the received calibration information to perform voltage compensation or current compensation on the converted actual electrical signal according to the instruction of the calibration information.

[0064] In the embodiment of the present application, the charging control module converts the AC power input from the AC power grid into an actual electrical signal based on the control of the AC conversion module; the calibration module collects the actual electrical signal output by the AC conversion module in real time, and compares the actual electrical signal with a preset reference electrical signal. When it is determined that the actual electrical signal has voltage drift or current drift, the calibration information is calculated based on the actual electrical signal and the preset reference electrical signal, and fed back to the charging control module; the charging control module controls the AC conversion module according to the calibration information to compensate or calibrate the converted actual electrical signal according to the calibration information during the conversion. In this way, the accuracy of the charging data can be improved and the reliability of the charging equipment can be improved.

[0065] In an optional embodiment, see Figure 7 The calibration module 103 in the charging device 10 provided in the embodiment of the present application includes: an AC calibration unit 1031 . The input end of the AC calibration unit 1031 is connected to the output end of the AC conversion module 102 , and the output end of the AC calibration unit 1031 is connected to the charging control module 101 for communication.

[0066] In an optional embodiment, see Figure 2 The operation of step S102 may specifically be:

[0067] S201: If the charging gun is connected to the AC charging port of the electric vehicle, the charging control module controls the AC conversion module to convert the AC power signal input from the AC power grid into an actual AC power signal.

[0068] Optionally, when the user plugs the charging gun of the charging device 10 into the AC charging port of the electric vehicle, the charging device 10 provides AC charging for the electric vehicle, and the charging control module 101 controls the AC conversion module 102 to convert the AC power input from the AC power grid into an actual AC power signal.

[0069] S202, the AC calibration unit collects the actual AC power signal in real time, determines AC calibration information according to the actual AC power signal and a preset reference AC power signal, and sends the information to the charging control module.

[0070] Optionally, the AC calibration unit 1031 collects the actual AC power signal output by the AC conversion module 102 in real time, and the AC calibration unit 1031 determines the AC power compensation coefficient based on the voltage deviation or current deviation between the received actual AC power signal and a preset reference AC power signal, and sends the calculated AC power compensation coefficient to the charging control module 101.

[0071] In an optional embodiment, see Figure 7The calibration module 103 in the charging device 10 provided in the embodiment of the present application includes: a DC calibration unit 1032. The input end of the DC calibration unit 1032 is connected to the output end of the AC conversion module 102, and the output end of the DC calibration unit 1032 is connected to the charging control module 101 for communication.

[0072] In an optional embodiment, see Figure 2 The operation of step S102 may specifically be:

[0073] S203: If the charging gun is connected to the DC charging port of the electric vehicle, the charging control module controls the AC conversion module to convert the AC power signal input from the AC power grid into an actual DC power signal.

[0074] Optionally, when the user plugs the charging gun of the charging device 10 into the DC charging port of the electric vehicle, the charging device 10 provides DC charging for the electric vehicle, and the charging control module 101 controls the AC conversion module 102 to convert the AC power input from the AC power grid into an actual DC power signal.

[0075] S204, the DC calibration unit collects the actual DC signal in real time, determines DC calibration information according to the actual DC signal and a preset reference DC signal, and sends the DC calibration information to the charging control module.

[0076] Optionally, the DC calibration unit 1032 collects the actual DC signal output by the AC conversion module 102 in real time, and the DC calibration unit 1032 determines the DC compensation coefficient based on the voltage deviation or current deviation between the received actual DC signal and a preset reference DC signal, and sends the calculated DC compensation coefficient to the charging control module 101.

[0077] In an optional embodiment, see Figure 8 The AC calibration unit 1031 in the charging device 10 provided in the embodiment of the present application includes: an AC voltage calibration component 311 and an AC current calibration component 312. The input end of the AC voltage calibration component 311 and the input end of the AC current calibration component 312 are both connected to the output end of the AC conversion module 102, and the output end of the AC voltage calibration component 311 and the output end of the AC current calibration component 312 are both connected to the charging control module 101 for communication.

[0078] In an optional embodiment, see Figure 3 The operation of step S202 may specifically be:

[0079] S301, the charging control module controls the AC conversion module to convert the AC power signal input from the AC power grid into an actual AC voltage / current, the AC voltage / current calibration component collects the actual AC voltage / current in real time, and determines whether the actual AC voltage / current has AC voltage / current drift based on the actual AC voltage / current and the preset reference AC voltage / current.

[0080] Optionally, the actual AC voltage / current is used to indicate that the charging control module 101 controls the AC conversion module 102 to convert the AC power input from the AC power grid into an actual AC voltage or an actual AC current. The AC voltage / current calibration component is used to indicate the AC voltage calibration component 311 or the AC current calibration component 312. The preset reference AC voltage / current is used to indicate a preset AC voltage reference threshold or a preset AC current reference threshold. The AC voltage / current drift is used to indicate that the charging device 10 may currently have an AC voltage drift or an AC current drift.

[0081] Optionally, after the user inserts the charging gun into the AC charging port of the electric vehicle, the charging device 10 establishes a connection with the electric vehicle via the charging gun, but at this time the charging device 10 has not yet started charging the electric vehicle. Before the charging device 10 starts AC charging for the electric vehicle, the charging device 10 is calibrated for AC voltage.

[0082] Optionally, the AC voltage calibration component 311 is provided with an error tolerance of AC voltage drift, and the error tolerance of AC voltage drift may be one thousandth or one percent. For example, if the preset reference AC voltage is 100V, and the AC voltage actually output by the AC-AC conversion unit 1021 after conversion is 99V, when the voltage error tolerance is one percent, it can be determined that the electrical signal conversion of the AC conversion module 102 is within a reasonable error range, and there is no AC voltage drift in the actual AC voltage output by the AC conversion module 102. For another example, when the voltage error tolerance is one thousandth, the actual AC voltage output by the AC conversion module 102 is determined to have AC voltage drift.

[0083] S302. If yes, the charging control module controls the AC conversion module to output multiple calibration AC voltages / currents respectively, and the AC voltage / current calibration component collects each calibration AC voltage / current in real time, and determines the AC voltage / current calibration information according to each calibration AC voltage / current and the preset reference AC voltage / current, and feeds it back to the charging control module.

[0084] Optionally, the verification AC voltage / current is used to indicate the verification AC voltage or the verification AC current, wherein the verification AC voltage is used to indicate that the charging control module 101 controls the AC conversion module 102 to randomly convert the AC voltage input from the AC power grid and output the AC voltage, the verification AC voltage can be 50V, 100V, 150V, 200V, etc., and the number of verification AC voltages can be 3, 4, 5, etc.; the verification AC current is used to indicate that the charging control module 101 controls the AC conversion module 102 to randomly convert the AC current input from the AC power grid and output the AC current, the verification AC current can be 10A, 14A, 16A, 20A, etc., and the number of verification AC currents can be 3, 4, 5, etc., and this application does not make specific restrictions on this. This application does not make specific restrictions on this.

[0085] Optionally, the AC voltage calibration component 311 obtains an AC voltage calibration coefficient through linear fitting according to the voltage difference between each calibration AC voltage and its corresponding reference AC voltage, and feeds back the final AC voltage calibration coefficient obtained by fitting as AC voltage calibration information to the charging control module 101. It is worth noting that the preset reference AC signal is not fixed, and as the charging control module 101 controls the AC voltage output by the AC conversion module 102 to change, the corresponding reference AC signal also changes accordingly.

[0086] Optionally, the charging control module 101 controls the AC conversion module 102 to compensate for the actual AC voltage after conversion according to the received AC voltage calibration information, and the AC voltage calibration component 311 collects the actual AC voltage after calibration in real time and feeds back the result to the charging control module 101. When the AC voltage calibration component 311 determines that there is no AC voltage drift in the actual AC voltage output by the AC conversion module 102, that is, the actual AC voltage output by the AC conversion module 102 after conversion is within the voltage error tolerance range, the charging control module 101 controls the AC conversion module 102 to shut down and stop the AC voltage calibration.

[0087] Optionally, after receiving the AC charging confirmation signal fed back by the electric vehicle, that is, after the charging control module 101 determines that both the electric vehicle and the charging device 10 meet the AC charging conditions, the charging control module 101 controls the AC conversion module 102 to convert the AC current input from the AC grid into actual AC current.

[0088] Optionally, an error tolerance of AC current drift is set in the AC current calibration component 312, and the error tolerance of AC current drift can be one thousandth or one hundredth, which is not specifically limited in the present application. When the current difference between the actual AC current collected by the AC current calibration component 312 and the reference AC current preset by the charging control module 101 is within the error tolerance range of the AC current drift, the actual AC current output by the AC conversion module 102 does not have AC current drift, and vice versa.

[0089] Optionally, the AC current calibration component 312 obtains an AC current calibration coefficient through linear fitting according to the current difference between each calibration AC current and its corresponding reference AC current, and feeds back the final AC current calibration coefficient obtained by fitting as AC current calibration information to the charging control module 101. The charging control module 101 controls the AC conversion module 102 according to the AC current calibration information to compensate the actual AC current according to the AC current calibration information during conversion, and continues to charge the electric vehicle after the actual AC current output by the AC conversion module 102 does not have AC current drift until the AC charging is completed.

[0090] Optionally, the charging control module 101 controls the AC conversion module 102 to compensate the actual AC current after conversion according to the received AC current calibration information, and the AC current calibration component 312 collects the actual AC current after calibration in real time and feeds back the result to the charging control module 101 .

[0091] It is worth noting that whether the actual AC current output by the AC conversion module 102 has AC current drift does not affect the AC charging process of the electric vehicle. The AC current calibration is performed during the AC charging process of the electric vehicle, and the AC voltage calibration is performed before the AC charging process of the electric vehicle. The end of the AC charging of the electric vehicle can be determined by the charging state of the electric vehicle, or it can be manually forced to shut down, and this application does not make specific restrictions on this.

[0092] In an optional embodiment, see Figure 8 The DC calibration unit 1032 in the charging device 10 provided in the embodiment of the present application includes: a DC voltage calibration component 321 and a DC current calibration component 322. The input end of the DC voltage calibration component 321 and the input end of the DC current calibration component 322 are both connected to the output end of the AC conversion module 102, and the output end of the DC voltage calibration component 321 and the output end of the DC current calibration component 322 are both connected to the charging control module 101 for communication.

[0093] In an optional embodiment, see Figure 4 The operation of step S204 may specifically be:

[0094] S401, the charging control module controls the AC conversion module to convert the AC power signal input from the AC power grid into an actual DC voltage / current, the DC voltage / current calibration component collects the actual DC voltage / current in real time, and determines whether the actual DC voltage / current has a DC voltage / current drift based on the actual DC voltage / current and a preset reference DC voltage / current.

[0095] Optionally, the actual DC voltage / current is used to indicate that the charging control module 101 controls the AC conversion module 102 to convert the AC power input from the AC power grid into an actual DC voltage or an actual DC current; the DC voltage / current calibration component is used to indicate the DC voltage calibration component 321 or the DC current calibration component 322; the preset reference DC voltage / DC is used to indicate a preset DC voltage reference value or a preset DC current reference value; the DC voltage / current drift is used to indicate that the charging device 10 currently has a DC voltage drift or a DC current drift.

[0096] Optionally, the user inserts the charging gun into the DC charging port of the electric vehicle, and before the charging device 10 starts DC charging for the electric vehicle, the DC voltage of the charging device 10 is calibrated, the charging control module 101 controls the AC conversion module 102 to convert the AC power signal input from the AC power grid into an actual DC voltage, and the DC voltage calibration component 321 collects the actual DC voltage in real time. The DC voltage calibration component 321 determines whether there is a DC voltage drift in the actual DC voltage based on the actual DC voltage and a preset reference DC voltage.

[0097] Optionally, the DC voltage calibration component 321 is provided with an error tolerance of DC voltage drift, and the error tolerance of DC voltage drift may be one thousandth or one hundredth, which is not specifically limited in the present application. When the voltage difference between the actual DC voltage collected by the DC current calibration component 322 and the reference DC voltage preset by the charging control module 101 is within the error tolerance range of the DC voltage drift, the actual DC voltage output by the AC conversion module 102 does not have a DC voltage drift, and vice versa.

[0098] S402. If yes, the charging control module controls the AC conversion module to output multiple calibration DC voltages / currents respectively, and the DC voltage / current calibration component collects each calibration DC voltage / current in real time, and determines the DC voltage / current calibration information according to each calibration DC voltage / current and the preset reference DC voltage / current, and feeds it back to the charging control module.

[0099] Optionally, the verification DC voltage / current is used to indicate the verification DC voltage or verification DC current output by the AC conversion module 102, wherein the verification DC voltage is used to indicate that the charging control module 101 controls the AC conversion module 102 to randomly convert the AC voltage input from the AC power grid and output a DC voltage, the verification DC voltage can be 100V, 200V, 300V, 400V, etc., and the number of verification DC voltages can be 3, 4, 5, etc.; the verification DC current is used to indicate that the charging control module 101 controls the AC conversion module 102 to randomly convert the AC current input from the AC power grid and output a DC current, the verification DC current can be 10A, 15A, 20A, 25A, etc., and the number of verification DC currents can be 3, 4, 5, etc., and this application does not make any specific limitations on this.

[0100] Optionally, the DC voltage calibration component 321 obtains a DC voltage calibration coefficient by linear fitting according to the voltage difference between each calibration DC voltage and its corresponding reference DC voltage, and feeds back the final DC voltage calibration coefficient obtained by fitting to the charging control module 101 as DC voltage calibration information.

[0101] Optionally, the charging control module 101 controls the AC conversion module 102 to compensate for the actual DC voltage after conversion according to the received DC current calibration information, and the DC voltage calibration component 321 collects the actual DC voltage after calibration in real time, and feeds back the result to the charging control module 101, and controls the AC conversion module 102 to shut down after there is no DC voltage drift in the actual DC voltage output by the AC conversion module 102.

[0102] Optionally, after receiving the DC charging confirmation signal fed back by the electric vehicle, that is, after the charging control module 101 determines that the electric vehicle and the charging device 10 both have the DC charging conditions, the charging control module 101 controls the AC conversion module 102 to convert the AC current input from the AC power grid into actual DC current, and the DC current calibration component 322 collects the actual DC current in real time. The DC current calibration component 322 determines whether the actual DC current has DC current drift based on the actual DC current and the preset reference DC current.

[0103] Optionally, the DC current calibration component 322 is provided with an error tolerance of DC current drift, and the error tolerance of DC current drift may be one thousandth or one hundredth, which is not specifically limited in the present application. When the current difference between the actual DC current collected by the DC current calibration component 322 and the reference DC current preset by the charging control module 101 is within the error tolerance range of the DC current drift, the actual DC current output by the AC conversion module 102 does not have a DC current drift, and vice versa.

[0104] Optionally, the DC current calibration component 322 obtains a DC current calibration coefficient by linear fitting according to the current difference between each verification DC current and its corresponding reference DC current, and feeds back the final DC current calibration coefficient obtained by fitting as DC current calibration information to the charging control module 101.

[0105] Optionally, the charging control module 101 controls the AC conversion module 102 to compensate for the actual DC current after conversion according to the received DC current calibration information, the DC current calibration component 322 collects the actual DC current after calibration in real time, and feeds back the result to the charging control module 101, and continues to charge the electric vehicle until the DC charging is completed after the actual DC current output by the AC conversion module 102 has no DC current drift.

[0106] It is worth noting that whether the actual DC current output by the AC conversion module 102 has a DC current drift does not affect the DC charging process of the electric vehicle, and the DC current calibration is performed during the DC charging process of the electric vehicle.

[0107] In an optional embodiment, see Figure 8 The AC conversion module 102 in the charging device 10 provided in the embodiment of the present application includes: an AC-AC conversion unit 1021 and an AC-DC conversion unit 1022, and the charging control module 101 includes: an AC charging control unit 1011 and a DC charging control unit 1012. Among them, the input end of the AC-AC conversion unit 1021 is used to access the AC power grid, the control end of the AC-AC conversion unit 1021 is communicatively connected to the AC charging control unit 1011, and the output end of the AC-AC conversion unit 1021 is respectively connected to the input end of the AC voltage calibration component 311, the input end of the AC current calibration component 312 and the AC charging port of the electric vehicle, and the output end of the AC voltage calibration component 311 and the output end of the AC current calibration component 312 are both communicatively connected to the AC charging control unit 1011; the input end of the AC-DC conversion unit 1022 is used to access the AC power grid, the control end of the AC-DC conversion unit 1022 is communicatively connected to the DC charging control unit 1012, and the output end of the AC-DC conversion unit 1022 is respectively connected to the input end of the DC voltage calibration component 321, the input end of the DC current calibration component 322 and the DC charging port of the electric vehicle, and the output end of the DC voltage calibration component 321 and the output end of the DC current calibration component 322 are both communicatively connected to the DC charging control unit 1012.

[0108] Optionally, the AC-AC conversion unit 1021 can be implemented by an AC-AC converter, and the AC-AC conversion unit 1021 converts the AC power signal input from the AC power grid into a controllable AC power signal under the action of the AC charging control unit 1011; the AC-DC conversion unit 1022 can be implemented by an AC-DC converter, and the AC-DC conversion unit 1022 converts the AC power signal input from the AC power grid into a controllable AC power signal under the action of the DC charging control unit 1012.

[0109] Optionally, the AC charging control unit 1011 can control the AC-AC conversion unit 1021 to convert the AC power signal input from the AC power grid to the charging device 10. The AC charging control unit 1011 can control the AC-AC conversion unit 1021 to convert the AC power signal input from the AC power grid into an AC power signal of a specified size. However, due to the loss in the actual electrical signal conversion process of the AC-AC conversion unit 1021, the actual AC power signal actually converted and output by the AC-AC conversion unit 1021 is not necessarily equal to the AC power signal specified by the AC charging control unit 1011.

[0110] Optionally, the AC calibration unit 1031 is used to collect in real time the AC signal output by the AC-AC conversion unit 1021 after actual conversion. The AC calibration unit 1031 determines whether voltage drift or current drift occurs in the actual AC signal based on a comparison result between the actual AC signal output by the AC-AC conversion unit 1021 and a preset reference AC signal, and generates AC calibration information corresponding to the actual AC signal when voltage drift or current drift occurs in the actual AC.

[0111] Optionally, the AC calibration information is used to indicate the AC calibration coefficient information corresponding to the actual AC power signal, and the AC calibration information includes: an AC voltage calibration coefficient and an AC current calibration coefficient. The AC calibration unit 1031 integrates an algorithm for calculating the AC power signal calibration coefficient. The AC calibration unit 1031 feeds back the calculated AC calibration information to the AC charging control unit 1011.

[0112] Optionally, the AC charging control unit 1011 controls the AC-AC conversion unit 1021 to calibrate the converted AC signal according to the received AC calibration information, the AC-AC conversion unit 1021 compensates or calibrates the converted AC voltage according to the AC voltage calibration coefficient contained in the AC calibration information, and the AC-AC conversion unit 1021 compensates or calibrates the converted AC current according to the AC current calibration coefficient contained in the AC calibration information.

[0113] Optionally, the AC charging control unit 1011 and the DC charging control unit 1012 can both be implemented by a controller, the AC charging control unit 1011 is used to control the AC charging process of the charging device 10, and the DC charging control unit 1012 is used to control the DC charging process of the charging device 10. It is worth noting that the DC charging process and the AC charging process of the electric vehicle are independent of each other and do not interfere with each other, and an electric vehicle can only support one charging mode at the same time.

[0114] Optionally, the DC charging control unit 1012 can control the AC-DC conversion unit 1022 to convert the AC power signal input from the AC power grid to the charging device 10. The DC charging control unit 1012 can control the AC-DC conversion unit 1022 to convert the AC power signal input from the AC power grid into a DC power signal of a specified size. However, due to the loss of the AC-DC conversion unit 1022 in the actual electrical signal conversion process, the actual DC power signal actually converted and output by the AC-DC conversion unit 1022 is not necessarily equal to the DC power signal specified by the DC charging control unit 1012.

[0115] Optionally, the DC calibration unit 1032 is used to collect in real time the DC signal output by the AC-DC conversion unit 1022 after actual conversion. The DC calibration unit 1032 determines whether voltage drift or current drift occurs in the actual DC signal based on a comparison result between the collected actual DC signal and a preset reference DC signal, and generates DC calibration information corresponding to the actual DC signal when voltage drift or current drift occurs in the actual DC.

[0116] Optionally, the DC calibration information is used to indicate DC calibration coefficient information corresponding to the actual DC signal, and the DC calibration information includes: a DC voltage calibration coefficient and a DC current calibration coefficient. The DC calibration unit 1032 integrates an algorithm for calculating the DC signal calibration coefficient. The DC calibration unit 1032 feeds back the calculated DC calibration information to the DC charging control unit 1012.

[0117] Optionally, the DC charging control unit 1012 controls the AC-DC conversion unit 1022 to calibrate the converted DC signal according to the received DC calibration information, the AC-DC conversion unit 1022 compensates or calibrates the converted DC voltage according to the DC voltage calibration coefficient included in the DC calibration information, and the AC-DC conversion unit 1022 compensates or calibrates the converted DC current according to the DC current calibration coefficient included in the DC calibration information.

[0118] In addition, the DC charging control unit 1012 is also connected to the communication unit in the electric vehicle. The DC charging control unit 1012 is used to obtain the communication message information between the charging device 10 and the communication unit of the electric vehicle, and determine whether the charging device 10 and the electric vehicle meet the DC charging conditions according to the communication message information. The communication message information includes: the DC charging requirements of the electric vehicle and the power supply capacity of the electric vehicle charging and discharging simulation test system.

[0119] Optionally, the communication message information is used to indicate the information exchange content between the electric vehicle and the DC charging control unit 1012 in the charging device 10 during the DC charging process of the electric vehicle. The communication message information includes the DC charging demand of the electric vehicle and the power supply capacity of the electric vehicle charging and discharging simulation test system. The DC charging demand of the electric vehicle is used to indicate the DC charging voltage and DC charging current required for the electric vehicle to perform DC charging. The power supply capacity of the electric vehicle charging and discharging simulation test system is used to indicate the DC charging voltage and DC charging current that the system can actually provide. When the power supply capacity of the system matches the DC charging demand of the electric vehicle, it is determined that both the electric vehicle and the system meet the DC charging conditions, otherwise, they do not meet.

[0120] In an optional embodiment, see Fig. 9 The charging device 10 provided in the embodiment of the present application further includes: an AC guiding unit 104 and an AC guiding calibration unit 105. The input end of the AC guiding unit 104 is connected to the AC charging control unit 1011 for communication, the output end of the AC guiding unit 104 is connected to the AC charging port of the electric vehicle via a charging gun, the input end of the AC guiding calibration unit 105 is connected to the output end of the AC guiding unit 104, and the output end of the AC guiding calibration unit 105 is connected to the AC charging control unit 1011 for communication.

[0121] In an optional implementation manner, the above charging data automatic calibration method further includes:

[0122] The AC pilot calibration unit is used to collect the AC pilot signal output by the AC pilot unit, and determine the AC pilot calibration information according to the AC pilot signal and the preset AC pilot signal, and feed it back to the charging control module. The charging control module controls the AC pilot unit according to the AC pilot calibration information to calibrate the AC pilot signal according to the AC pilot calibration information.

[0123] Optionally, the preset AC pilot signal is a reference signal corresponding to the AC pilot signal pre-set by the AC charging control unit 1011. The AC pilot unit 104 is used to provide the AC pilot signal required for the electric vehicle to perform an AC charging test. The AC pilot signal includes: a CC signal and a CP signal. The AC pilot calibration unit 105 determines whether the AC pilot signal output by the AC pilot unit 104 needs to be calibrated based on the AC pilot signal actually output by the AC pilot unit 104 and the AC pilot signal preset by the AC charging control unit 1011.

[0124] Optionally, when the AC pilot signal output by the AC pilot unit 104 needs to be calibrated, the AC pilot calibration unit 105 calculates an AC pilot calibration coefficient based on the AC pilot signal actually output by the AC pilot unit 104 and the AC pilot signal pre-set by the AC charging control unit 1011, and feeds back the AC pilot calibration coefficient as AC pilot calibration information to the AC charging control unit 1011. The AC charging control unit 1011 controls the AC pilot unit 104 to calibrate the output AC pilot signal based on the received AC pilot calibration information.

[0125] It is worth noting that the CC signal in the AC pilot signal output by the AC pilot unit 104 is a voltage signal, but the CP signal may be a voltage signal or a pulse width modulation signal. When the CP signal is a pulse width modulation signal, the pulse width modulation frequency, the pulse width modulation rising edge, the falling edge, etc. may need to be calibrated, and this application does not make any specific limitations on this.

[0126] In an optional embodiment, see Fig.10 The charging device 10 provided in the embodiment of the present application further includes: an AC switch unit, which is composed of a first contactor, a second contactor, a third contactor, and a fourth contactor. Among them, the control end of the first contactor, the control end of the second contactor, the control end of the third contactor, and the control end of the fourth contactor are all connected to the AC charging control unit 1011 in communication, and the input end of the first contactor, the input end of the second contactor, the input end of the third contactor, and the input end of the fourth contactor are all connected to the output end of the AC-AC conversion unit 1021, and the output end of the first contactor, the output end of the second contactor, the output end of the third contactor, and the output end of the fourth contactor are all connected to the electric vehicle via the charging gun.

[0127] Optionally, when the user plugs the charging gun into the charging port of the electric vehicle, the AC charging control unit 1011 controls all contactors in the AC switch unit to be disconnected, that is, the charging device 10 is disconnected from the electric vehicle. After receiving the AC charging confirmation signal fed back by the electric vehicle, the charging device 10 controls all contactors in the AC switch unit to be turned on, and the charging device 10 starts to perform AC charging for the electric vehicle. After the AC charging of the electric vehicle is completed, the contactors in the AC switch unit are controlled to be disconnected.

[0128] In an optional embodiment, see Fig. 9 The charging device 10 provided in the embodiment of the present application further includes: a DC guiding unit 106 and a DC guiding calibration unit 107. The input end of the DC guiding unit 106 is connected to the DC charging control unit 1012 for communication, the output end of the DC guiding unit 106 is connected to the DC charging port of the electric vehicle via a charging gun, the input end of the DC guiding calibration unit 107 is connected to the output end of the DC guiding unit 106, and the output end of the DC guiding calibration unit 107 is connected to the input end of the DC charging control unit 1012.

[0129] In an optional implementation manner, the above charging data automatic calibration method further includes:

[0130] The DC guidance calibration unit is used to collect the DC guidance signal output by the DC guidance unit in real time, determine the DC guidance calibration information according to the DC guidance signal and the preset DC guidance signal, and feed back the DC guidance calibration information to the charging control module. The charging control module controls the DC guidance unit according to the DC guidance calibration information to calibrate the DC guidance signal according to the DC guidance calibration information.

[0131] Optionally, the preset DC pilot signal is a reference signal corresponding to the DC pilot signal preset by the DC charging control unit 1012. The DC pilot unit 106 is used to provide the DC pilot signal required for the electric vehicle to perform a DC charging test. The DC pilot signal includes: a CC1 signal and a CC2 signal. The DC pilot calibration unit 107 determines whether the DC pilot signal output by the DC pilot unit 106 needs to be calibrated based on the DC pilot signal actually output by the DC pilot unit 106 and the DC pilot signal preset by the DC charging control unit 1012.

[0132] Optionally, when the DC pilot signal output by the DC pilot unit 106 needs to be calibrated, the DC pilot calibration unit 107 calculates a DC pilot calibration coefficient according to the DC pilot signal actually output by the DC pilot unit 106 and the DC pilot signal preset by the DC charging control unit 1012, and feeds the DC pilot calibration coefficient as DC pilot calibration information to the DC charging control unit 1012, and the DC charging control unit 1012 controls the DC pilot unit 106 to calibrate the output DC pilot signal based on the received DC pilot calibration information. It is worth noting that the DC pilot signals output by the DC pilot unit 106 are all voltage signals.

[0133] In an optional embodiment, see Fig. 9 The charging device 10 provided in the embodiment of the present application further includes: an auxiliary source unit 108 and an auxiliary source calibration unit 109. The input end of the auxiliary source unit 108 is connected to the DC charging control unit 1012 in communication, the output end of the auxiliary source unit 108 is connected to the communication unit in the electric vehicle via the charging gun, the input end of the auxiliary source calibration unit 109 is connected to the output end of the auxiliary source unit 108, and the output end of the auxiliary source calibration unit 109 is connected to the input end of the DC charging control unit 1012 in communication.

[0134] It is worth noting that the auxiliary source unit 108 and the auxiliary source calibration unit 109 in the charging device 10 are only applicable to the DC charging simulation test of the charging device 10 on the electric vehicle, and the AC charging test of the electric vehicle does not require the auxiliary source unit 108 to supply power.

[0135] In an optional embodiment, see Figure 5 , the charging data automatic calibration method provided in the embodiment of the present application also includes:

[0136] S501, the auxiliary source calibration unit is used to collect the positive auxiliary source voltage and the negative auxiliary source voltage output by the auxiliary source unit, and calculate the voltage difference between the positive auxiliary source voltage and the negative auxiliary source voltage.

[0137] Optionally, the auxiliary source unit 108 is used to power the communication unit of the electric vehicle, and the auxiliary source calibration unit 109 is used to collect in real time the positive auxiliary source voltage output from the positive output terminal of the auxiliary source unit 108 and the negative auxiliary source voltage output from the negative output terminal of the auxiliary source unit, and the auxiliary source calibration unit 109 calculates in real time the voltage difference of the auxiliary source unit output to determine whether the voltage output by the auxiliary source unit 108 is within the range that the communication unit of the electric vehicle can withstand.

[0138] S502: The auxiliary source calibration unit determines auxiliary source calibration information according to the voltage difference and the preset auxiliary source voltage difference, and feeds it back to the charging control module. The charging control module controls the auxiliary source unit to calibrate the positive auxiliary source voltage and the negative auxiliary source voltage according to the auxiliary source calibration information.

[0139] Optionally, the preset auxiliary source voltage difference is the auxiliary source voltage difference that the communication unit of the electric vehicle can withstand, which is preset by the DC charging control unit 1012. The auxiliary source calibration unit 109 determines whether the auxiliary source voltage actually output by the auxiliary source unit 108 needs to be calibrated according to the comparison result between the suppression of the auxiliary source voltage actually output by the auxiliary source unit and the auxiliary source voltage difference preset by the DC charging control unit 1012. If so, the auxiliary source calibration unit 109 calculates the auxiliary source calibration coefficient according to the voltage difference of the auxiliary source voltage actually output by the auxiliary source unit and the preset auxiliary source voltage difference, and sends the auxiliary source calibration coefficient as auxiliary source calibration information to the DC charging control unit 1012. The DC charging control unit 1012 controls the auxiliary source unit 108 to calibrate the auxiliary source voltage output by it according to the auxiliary source calibration information.

[0140] In an optional embodiment, see Fig.11 The charging device 10 provided in the embodiment of the present application further includes: an auxiliary source switch unit, and the auxiliary source switch unit includes: a positive auxiliary source switch and a negative auxiliary source switch. Among them, the control end of the positive auxiliary source switch and the control end of the negative auxiliary source switch are both connected to the DC charging control unit 1012 for communication, the input end of the positive auxiliary source switch is connected to the positive output end of the auxiliary source unit 108, the input end of the negative auxiliary source switch is connected to the negative output end of the auxiliary source unit 108, and the output end of the positive auxiliary source switch and the output end of the negative auxiliary source switch are connected to the communication unit of the electric vehicle via the charging gun.

[0141] Optionally, the positive auxiliary source switch is used to control the connection and disconnection between the positive output terminal of the auxiliary source unit 108 and the communication unit of the electric vehicle, and the negative auxiliary source switch is used to control the connection and disconnection between the negative output terminal of the auxiliary source unit 108 and the communication unit of the electric vehicle. When the DC charging control unit 1012 receives the DC charging confirmation signal fed back by the electric vehicle, the DC charging control unit 1012 controls both the positive auxiliary source switch and the negative auxiliary source switch to be turned on, and the auxiliary source unit 108 starts to supply power to the communication unit of the electric vehicle.

[0142] In an optional embodiment, see Fig.11 The charging device 10 provided in the embodiment of the present application further includes: a DC switch unit, and the DC switch unit includes: a positive DC switch and a negative DC switch. Among them, the control ends of the positive DC switch and the negative DC switch are both connected to the DC charging control unit 1012 for communication, the input end of the positive DC switch is connected to the positive output end of the AC-DC conversion unit 1022, the input end of the negative DC switch is connected to the negative output end of the AC-DC conversion unit 1022, and the output end of the positive DC switch and the output end of the negative DC switch are both connected to the electric vehicle via the charging gun.

[0143] Optionally, when the user plugs the charging gun into the charging port of the electric vehicle, the DC charging control unit 1012 controls the positive DC switch and the negative DC switch in the DC switch unit to be disconnected, that is, the charging device 10 is disconnected from the electric vehicle. After receiving the DC charging confirmation signal fed back by the electric vehicle, the charging device 10 controls the positive DC switch and the negative DC switch in the DC switch unit to be turned on, and the charging device 10 starts to perform DC charging for the electric vehicle. After the DC charging of the electric vehicle is completed, the positive DC switch and the negative DC switch in the DC switch unit are controlled to be disconnected.

[0144] Fig.12 For a flow chart of a method for automatic AC charging process provided by this application, see Fig.12The process of AC charging of an electric vehicle by the charging device provided in the embodiment of the present application is specifically as follows: S1. After the charging device 10 is connected to the AC charging port of the electric vehicle via the charging gun, the AC charging control unit 1011 first controls the L1, L2, L3, and N phase contactors in the AC switch unit to be disconnected; S2. The AC charging control unit 1011 controls the AC-AC conversion unit 1021 to output a 220V reference AC voltage, and the AC voltage calibration component 311 performs high-precision acquisition of the actual AC voltage output by the AC-AC conversion unit 1021; S3. When the voltage error of the actual AC voltage collected by the AC voltage calibration component 311 exceeds the AC voltage error tolerance compared to the 220V reference AC voltage, the ...4. Unit 1011 controls the AC-AC conversion unit 1021 to output calibration AC voltages of 50V, 100V, 150V and 200V respectively, and collects each calibration AC voltage in real time through the AC voltage calibration component 311; S4, the AC voltage calibration component 311 uses the AC voltage calibration algorithm to calculate the voltage error between each calibration AC voltage and its corresponding reference AC voltage, and fits the AC voltage calibration coefficient, and feeds the AC voltage calibration coefficient as AC voltage calibration information to the AC charging control unit 1011; S5, the AC charging control unit 1011 controls the AC-AC conversion unit 1021 to calibrate the converted AC voltage according to the AC voltage calibration information, so that the AC-AC conversion The conversion unit 1021 re-outputs 220V AC voltage; S6, after the AC voltage calibration is completed, the AC-AC conversion unit 1021 is turned off. After the electric vehicle detects the external RC resistance, the electric vehicle feeds back an AC charging confirmation signal to the AC charging control unit 1011. There is a CP signal generator in the AC guidance unit 104, and the initial value of the CP signal is 12V; when the charging device 10 is connected to the electric vehicle, the CP voltage is 9V; when the electric vehicle confirms the connection, the S2 switch in the car is closed, the CP voltage changes to 6V, and the electric vehicle can start charging; S7, the AC charging control unit 1011 controls the contactors L1, L2, L3, and N in the AC switch unit to be closed, and controls the AC-AC conversion unit 102 1 outputs a 5A reference AC current; S8, the AC current calibration component 312 collects the actual AC current output by the AC-AC conversion unit 1021. When the error of the actual AC current exceeds the 5A reference AC current, the AC charging control unit 1011 controls the AC-AC conversion unit 1021 to output 10A, 14A, 16A and 20A calibration AC currents respectively, and collects each calibration AC current through the AC current calibration component 312; S9, the AC current calibration component 312 uses the AC current calibration algorithm to calculate the error between each calibration AC current and its corresponding reference AC current, and fits to obtain the AC calibration coefficient, and feeds the AC calibration coefficient back to the AC charging control unit 1011 as the AC calibration information;S10, the AC charging control unit 1011 controls the AC-AC conversion unit 1021 to calibrate the converted AC current according to the AC current calibration information, so that the AC-AC conversion unit 1021 re-outputs 5A AC current, and the charging device 10 controls the appropriate current value to charge the electric vehicle. When the electric vehicle needs to end charging, the AC charging control unit 1011 controls the CP signal output by the AC guide unit 104 to be 12V, the electric vehicle stops charging, and controls the AC-AC conversion unit 1021 and the AC switch unit to be turned off, and charging ends. ;

[0145] Fig.13 A flow chart of a method for automatic calibration of a DC charging process provided in this application, see Fig.13 The process of DC charging of an electric vehicle by the charging device provided in the embodiment of the present application is specifically as follows: S1. After the charging device 10 is connected to the DC charging port of the electric vehicle via the charging gun, the DC charging control unit 1012 first controls the DC+ and DC- in the DC switch unit to be disconnected;

[0146] S2. The DC charging control unit 1012 controls the AC-DC conversion unit 1022 to output a reference DC voltage of 500V, and the DC voltage calibration component 321 collects the actual DC voltage output by the AC-DC conversion unit 1022 with high precision; S3. When the voltage error of the actual AC voltage collected by the DC voltage calibration component 321 exceeds the DC voltage error tolerance compared to the 500V reference DC voltage, the DC charging control unit 1012 controls the AC-DC conversion unit 1022 to output calibration DC voltages of 100V, 200V, 300V and 400V respectively, and the DC voltage calibration component 321 performs real-time calibration on each calibration DC voltage. S4. The DC voltage calibration component 321 calculates the voltage error between each calibration DC voltage and its corresponding reference DC voltage using a DC voltage calibration algorithm, and obtains a DC voltage calibration coefficient by fitting, and feeds the DC voltage calibration coefficient back to the DC charging control unit 1012 as DC voltage calibration information; S5. The DC charging control unit 1012 controls the AC-DC conversion unit 1022 to calibrate the converted DC voltage according to the DC voltage calibration information, so that the AC-DC conversion unit 1022 re-outputs a 500V DC voltage; S6. After the DC voltage calibration is completed, turn off the AC-DC conversion unit 1022. When After the charging device 10 detects that the CC1 signal of the DC guiding unit 106 is 4V, it controls all switches in the auxiliary source switch unit in the DC guiding unit 106 to be closed, and the auxiliary source unit 108 supplies 12V to the communication unit of the electric vehicle; S7, the charging device 10 communicates with the communication unit of the electric vehicle through the CAN bus, and after determining that both meet the DC charging conditions according to the communication message information, DC charging can be started; S8, the DC charging control unit 1012 controls the DC+ and DC- in the DC switch unit to be closed, and controls the AC-DC conversion unit 1022 to output a reference DC current of 5A; S9, the DC current calibration component 322 adopts The actual DC current output by the AC-DC conversion unit 1022 is collected. When the error of the actual DC current exceeds the 5A reference DC current, the DC charging control unit 1012 controls the AC-DC conversion unit 1022 to output 10A, 15A, 20A and 25A calibration DC currents respectively, and collects each calibration DC current through the DC current calibration component 322; S10, the DC current calibration component 322 calculates the error between each calibration DC current and its corresponding reference DC current using a DC current calibration algorithm, and obtains a DC calibration coefficient by fitting, and feeds the DC calibration coefficient back to the DC charging control unit 1012 as DC calibration information;S11, the DC charging control unit 1012 controls the AC-DC conversion unit 1022 to calibrate the converted DC current according to the DC current calibration information, so that the AC-DC conversion unit 1022 re-outputs 5A DC current, and the charging device 10 controls the appropriate current value to charge the electric vehicle. When the electric vehicle needs to end charging, the DC charging control unit 1012 controls the AC-DC conversion unit 1022 and the DC switch unit to turn off, and charging ends. ;

[0147] Fig.14 is a schematic diagram of a charging test system provided in an embodiment of the present application, see Fig.14 The charging test system 20 includes: a communication module 1401 and a control module 1402, wherein the communication module 1401 is used to communicate with an external device, and the control module 1402 is used to implement the steps in any of the above method embodiments.

[0148] At present, the AC charging and discharging simulation control system of electric vehicles usually adopts a modular design. The functions of each module are independent and cooperate with each other, which is convenient for the expansion of the AC charging and discharging simulation test system of electric vehicles and ensures the flexibility of AC charging and discharging tests. Among them, the AC charging and discharging simulation control system of electric vehicles integrates national standard test modules and abnormal case library modules to achieve comprehensive coverage of electric vehicle charging and discharging simulation tests. In addition, the AC charging and discharging simulation control system of electric vehicles is also equipped with a user-edited test case module to maximize the flexibility and openness of electric vehicle charging and discharging simulation tests. However, during the actual charging and discharging test of electric vehicles, with the matching problems of the simulation test system and the influence of the external environment, the voltage and current of the charging and discharging test will produce error drift. This solution does not have the calibration function of the charging voltage and charging current, which reduces the accuracy of the electric vehicle charging and discharging simulation test results.

[0149] To this end, the embodiment of the present application provides a charging test system, the charging test system 20 includes: a communication module 1401 and a control module 1402, wherein the control module 1402 is used to collect the actual electrical signal transmitted from the charging pile or the charging test system 20 to the charging port of the charging car in real time, and determine the calibration information according to the difference between the actual electrical signal and the preset reference electrical signal, and control the charging test system 20 to compensate when converting the AC signal of the AC power grid according to the calibration information, and the communication module 1401 feeds back the charging test results of the electric vehicle to the external device in real time. In this way, the accuracy of the charging data can be improved and the reliability of the charging equipment can be improved.

[0150] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0151] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A charging data automatic calibration method, characterized in that: Applied to a charging device, the charging device comprises: a charging control module, an AC conversion module and a calibration module, and the method comprises: The charging control module converts the AC power signal input from the AC power grid into an actual electrical signal based on the AC conversion module; The calibration module determines calibration information according to the actual electrical signal and a preset reference electrical signal, and sends the calibration information to the charging control module; The charging control module controls the AC conversion module to perform compensation according to the calibration information during conversion.

2. The charging data automatic calibration method according to claim 1, characterized in that: The calibration module includes: an AC calibration unit, the calibration module determines calibration information according to the actual electrical signal and a preset reference electrical signal, and sends the calibration information to the charging control module, including: If the charging gun is connected to the AC charging port of the electric vehicle, the charging control module controls the AC conversion module to convert the AC power signal input from the AC power grid into an actual AC power signal; The AC calibration unit collects the actual AC power signal in real time, determines AC calibration information according to the actual AC power signal and a preset reference AC power signal, and sends the information to the charging control module.

3. The charging data automatic calibration method according to claim 2, characterized in that: The calibration module further includes: a DC calibration unit, the calibration module determines calibration information according to the actual electrical signal and a preset reference electrical signal, and sends the calibration information to the charging control module, and further includes: If the charging gun is connected to the DC charging port of the electric vehicle, the charging control module controls the AC conversion module to convert the AC power signal input from the AC power grid into an actual DC power signal; The DC calibration unit collects the actual DC power signal in real time, determines DC calibration information according to the actual DC power signal and a preset reference DC power signal, and sends the DC calibration information to the charging control module.

4. The charging data automatic calibration method according to claim 2, characterized in that: The AC calibration unit includes: an AC voltage calibration component and an AC current calibration component. The AC calibration unit collects the actual AC signal in real time, determines AC calibration information according to the actual AC signal and a preset reference AC signal, and sends the information to the charging control module, including: The charging control module controls the AC conversion module to convert the AC power signal input from the AC power grid into an actual AC voltage / current. The AC voltage / current calibration component collects the actual AC voltage / current in real time, and determines whether the actual AC voltage / current has an AC voltage / current drift according to the actual AC voltage / current and a preset reference AC voltage / current. If so, the charging control module controls the AC conversion module to output multiple verification AC voltages / currents respectively, and the AC voltage / current calibration component collects each of the verification AC voltages / currents in real time, and determines the AC voltage / current calibration information based on each of the verification AC voltages / currents and the preset reference AC voltage / current, and feeds it back to the charging control module.

5. The charging data automatic calibration method according to claim 3, characterized in that: The DC calibration unit includes: a DC voltage calibration component and a DC current calibration component. The DC calibration unit collects the actual DC signal in real time, determines DC calibration information according to the actual DC signal and a preset reference DC signal, and sends the DC calibration information to the charging control module, including: The charging control module controls the AC conversion module to convert the AC power signal input from the AC power grid into an actual DC voltage / current. The DC voltage / current calibration component collects the actual DC voltage / current in real time, and determines whether the actual DC voltage / current has a DC voltage / current drift according to the actual DC voltage / current and a preset reference DC voltage / current. If so, the charging control module controls the AC conversion module to output multiple verification DC voltages / currents respectively, and the DC voltage / current calibration component collects each of the verification DC voltages / currents in real time, and determines the DC voltage / current calibration information based on each of the verification DC voltages / currents and the preset reference DC voltage / current, and feeds it back to the charging control module.

6. The charging data automatic calibration method according to claim 1, characterized in that: The charging device further includes: an AC guiding unit and an AC guiding calibration unit, and the method further includes: The AC pilot calibration unit is used to collect the AC pilot signal output by the AC pilot unit, and determine AC pilot calibration information according to the AC pilot signal and a preset AC pilot signal, and feed the AC pilot calibration information back to the charging control module. The charging control module controls the AC pilot unit to calibrate the AC pilot signal according to the AC pilot calibration information.

7. The charging data automatic calibration method according to claim 1, characterized in that: The charging device further includes: a DC guiding unit and a DC guiding calibration unit, and the method further includes: The DC guidance calibration unit is used to collect the DC guidance signal output by the DC guidance unit in real time, determine DC guidance calibration information according to the DC guidance signal and a preset DC guidance signal, and feed back the DC guidance calibration information to the charging control module. The charging control module controls the DC guidance unit to calibrate the DC guidance signal according to the DC guidance calibration information.

8. The charging data automatic calibration method according to claim 1, characterized in that: The charging device further includes: an auxiliary source unit and an auxiliary source calibration unit, and the method further includes: The auxiliary source calibration unit is used to collect the positive auxiliary source voltage and the negative auxiliary source voltage output by the auxiliary source unit, and calculate the voltage difference between the positive auxiliary source voltage and the negative auxiliary source voltage; The auxiliary source calibration unit determines auxiliary source calibration information according to the voltage difference and the preset auxiliary source voltage difference, and feeds it back to the charging control module. The charging control module controls the auxiliary source unit to calibrate the positive auxiliary source voltage and the negative auxiliary source voltage according to the auxiliary source calibration information.

9. A charging device, characterized in that: The charging device comprises: a charging control module, an AC conversion module and a calibration module, wherein the first input end of the AC conversion module is used to access the AC power grid, the calibration module is connected to the AC conversion module, and the calibration module and the AC conversion module are both connected to the charging control module; The charging control module is used to implement the steps of the method described in any one of claims 1 to 8 above.

10. A charging test system, characterized in that: The charging test system comprises: a control module and a communication module, wherein the communication module communicates with an external device, and the control module is used to implement the steps of the method described in any one of claims 1 to 8 above.

Images