Test System and Method for DC Charger

Abstract

The present invention provides a test system and method for a DC charger. The system includes: a communication unit for acquiring charging data in the DC charger; a simulation unit for performing charging simulation according to the charging data in the DC charger; and a detection unit for performing power distribution detection according to the simulation data obtained by the simulation unit during charging simulation. The present invention can implement the test of the power distribution of the DC charger, with high test efficiency, thereby improving the R & D speed of the DC charger, accelerating the update and optimization of the power distribution control program, and having low test cost, and can avoid consuming or damaging the hardware of the DC charger.

Description

Technical Field

[0001] The present invention relates to the technical field of charger testing, and particularly relates to a testing system for a DC charger and a testing method for a DC charger. Background Art

[0002] The development trend of DC chargers is towards high-power and high-current charging, and the application of DC chargers is becoming increasingly popular.

[0003] Currently, most of the tests for DC chargers tend to focus on charging tests and aging tests. There is no power distribution test scheme, and most tests require the actual operation of the DC charger, resulting in low test efficiency and possible damage to the charger during testing. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a testing system and method for a DC charger, which can achieve the testing of the power distribution of the DC charger, with high test efficiency, thereby improving the R & D speed of the DC charger, accelerating the update and optimization of the power distribution control program, and having low test costs, and can avoid consumption or damage to the hardware of the DC charger.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A testing system for a DC charger includes: a communication unit for obtaining charging data in the DC charger; a simulation unit for performing charging simulation according to the charging data in the DC charger; and a detection unit for performing power distribution detection according to the simulation data of the charging simulation by the simulation unit.

[0007] The detection unit is further configured to perform overvoltage, undervoltage, overcurrent, and undercurrent detection according to the simulation data of the charging simulation by the simulation unit.

[0008] The testing system for the DC charger further includes: a display unit for displaying the detection results of the detection unit.

[0009] The simulation data includes the status of the power distribution unit in the DC charger, the status of the output relay, the control data of the power supply module, the operation data of the power supply module, and the BMS (Battery Management System) data received by the DC charger, where the BMS data includes the charging demand.

[0010] The detection unit is specifically configured to determine whether the current power distribution conforms to a preset power distribution algorithm according to the status of the power distribution unit in the DC charger and the charging demand when the DC charger performs single-gun or multi-gun charging.

[0011] The detection unit is specifically configured to, after the state of any one or more charging guns of the DC charger changes, obtain the set output curve according to the control data of the power supply module in the DC charger, and obtain the actual output curve according to the state of the power distribution unit and the operation data of the power supply module in the DC charger. The display unit is configured to display the set output curve and the actual output curve, so as to determine whether the switching of power distribution is successful.

[0012] The detection unit is specifically configured to, when the DC charger performs single-gun or multi-gun charging, obtain the required output curve according to the charging demand, and obtain the actual output curve according to the state of the power distribution unit and the operation data of the power supply module in the DC charger. The display unit is configured to display the required output curve and the actual output curve, so as to determine overvoltage, undervoltage, overcurrent, and undercurrent.

[0013] A testing method for a DC charger includes the following steps: obtaining charging data in the DC charger; performing charging simulation according to the charging data in the DC charger; and performing power distribution detection according to the simulation data of the charging simulation.

[0014] The testing method for the DC charger further includes: performing overvoltage, undervoltage, overcurrent, and undercurrent detection according to the simulation data of the charging simulation.

[0015] The testing method for the DC charger further includes: displaying the detection results of power distribution and overvoltage, undervoltage, overcurrent, and undercurrent detection.

[0016] Advantages of the present invention:

[0017] The present invention realizes the test of the power distribution of the DC charger through software simulation, with high test efficiency, thereby improving the R & D speed of the DC charger, accelerating the update and optimization of the power distribution control program, and having low test cost, and can avoid consumption or damage to the hardware of the DC charger. Description of the drawings

[0018] Figure 1 It is a block diagram of the testing system of the DC charger according to an embodiment of the present invention;

[0019] Figure 2 It is a block diagram of the testing system of the DC charger according to an embodiment of the present invention;

[0020] Figure 3 [[ID=3(4]]It is a flowchart of the testing method of the DC charger according to an embodiment of the present invention;

[0021] Figure 4Flow chart of the test method for a DC charger according to an embodiment of the present invention. Detailed implementation manners

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0023] The DC charger in the embodiment of the present invention may include multiple power modules, multiple charging guns, a module control unit, a power distribution unit, a distribution control unit, and a charging control unit. Among them, the power distribution unit may be a relay group or a finished PDU that realizes the power distribution function, and it can realize the connection between different power modules and different charging guns through the switching of states; the module control unit can control the output of each power module, for example, control the voltage, current, and power of each power module connected to the charging gun, and can monitor the actual working parameters of the power module; the charging control unit can communicate with the BMS of the electric vehicle, receive data such as the charging requirements of the BMS, and the charging requirements of the BMS include charging requests, required charging voltages, charging currents, charging powers, etc.; the distribution control unit can control the state of the power distribution unit according to a preset power distribution algorithm, and the preset power distribution algorithm can realize controlling the connection of a certain or certain power modules and a certain or certain charging guns under a certain charging requirement. In addition, an output relay can be provided at the rear stage of the power distribution unit, that is, between the power distribution unit and the charging gun, and a battery relay can be provided between the charging port of the electric vehicle and the power battery. When the power distribution unit makes a certain or certain power modules connected to a certain charging gun through the switching of states, and the output relay of this charging gun and the battery relay of the electric vehicle connected to this charging gun are closed, a charging circuit for charging this electric vehicle can be formed.

[0024] As Figure 1 shown, the test system of the DC charger in the embodiment of the present invention includes a communication unit 10, a simulation unit 20, and a detection unit 30. Among them, the communication unit 10 is used to obtain charging data in the DC charger; the simulation unit 20 is used to perform charging simulation according to the charging data in the DC charger; the detection unit 30 is used to perform power distribution detection according to the simulation data of the charging simulation by the simulation unit 20.

[0025] Further, the detection unit 30 may also be used to perform overvoltage, undervoltage, overcurrent, and undercurrent detection according to the simulation data of the charging simulation by the simulation unit 20.

[0026] Further, asFigure 2 As shown in Figure 2 , the test system of the DC charger according to the embodiment of the present invention may further include a display unit 40, and the display unit 40 may be used to display the detection results of the detection unit 30.

[0027] In an embodiment of the present invention, the communication unit 10 may be connected to the DC charger through a communication interface to perform data interaction with the DC charger.

[0028] In an embodiment of the present invention, the charging data in the DC charger includes all data used for charging simulation obtained from the DC charger, such as the charging control programs of the module control unit, the distribution control unit, and the charging control unit, the number of power modules, the number of charging guns, etc. The simulation data for charging simulation by the simulation unit 20 according to the charging data in the DC charger may include the state of the power distribution unit in the DC charger, the state of the output relay, the control data of the power module, the operation data of the power module, and the BMS data received by the DC charger, where the BMS data includes the charging demand.

[0029] Specifically, the simulation unit 20 may simulate the power battery and its BMS, simulate the battery characteristics, and simulate the state of the output relay and the state of the power distribution unit at a required charging voltage, charging current, and charging power, so as to form a charging circuit, and simulate the voltage, current, and charging power in the charging circuit according to the voltage, current, and power of the power module.

[0030] In other embodiments of the present invention, the simulation unit 20 may also perform simulation of other peripherals according to actual needs. For example, according to the voltage, current output by each power module, the state of the output relay, and the simulated battery state (including battery voltage, the state of the battery relay), the voltage and current of the electric meter are simulated, and then the integral method is used for power calculation to realize the simulation of the electric meter.

[0031] In an embodiment of the present invention, when the DC charger performs single-gun or multi-gun charging, the detection unit 30 may determine whether the current power distribution conforms to a preset power distribution algorithm according to the state of the power distribution unit in the DC charger and the charging demand. Specifically, when simulating single-gun or multi-gun charging of the DC charger, first, a power distribution table may be calculated according to the state of the power distribution unit, that is, the correspondence between the power module number and the charging gun number. Then, the number of the charging gun that needs to be charged is obtained according to the charging demand, and the required power of the charging gun that needs to be charged is obtained according to the charging demand. Finally, it is determined whether the number of the charging gun that needs to be charged matches the number of the charging gun in the above power distribution table, and whether the required power of the charging gun that needs to be charged is equal to the total output power of the power module corresponding to the charging gun with this number in the above power distribution table. If so, it means that the current power distribution conforms to the preset power distribution algorithm.

[0032] In one embodiment of the present invention, after the status of any one or more charging guns of the DC charger changes, the detection unit 30 can obtain a set output curve based on the control data of the power module and obtain an actual output curve based on the status of the power distribution unit and the operating data of the power module. The display unit 40 can display the set output curve and the actual output curve to determine whether the power distribution switch was successful. It should be understood that changing the status of the DC charger's charging guns, such as setting one or more charging guns to start or stop charging, is actually changing the output of the DC charger. When the corresponding relationship between the power module and the charging gun changes, the power module will be switched off with reduced current or switched on with increased voltage, which involves dynamic adjustment of the power module voltage and current. The actual output voltage, output current, and output power of the DC charger are calculated based on the status of the power distribution unit and the operating data of the power distribution unit. By displaying the set output curve and the actual output curve, the two can be easily compared. If the difference between the two is not significant, it indicates that the power distribution switch was successful, that is, the switching command was successfully received and executed, and the distribution process does not risk failures such as sticking or loss of control of the power distribution unit relay.

[0033] In one embodiment of the present invention, the detection unit 30 can obtain a desired output curve based on charging requirements when the DC charger is performing single-charge or multi-charge charging, and obtain an actual output curve based on the status of the power distribution unit and the operating data of the power module in the DC charger. The display unit 40 can display the desired output curve and the actual output curve to determine whether overvoltage, undervoltage, overcurrent, or undercurrent are present. By displaying the desired output curve and the actual output curve, this embodiment of the present invention facilitates comparison between the two. If the difference between the two is not significant, it indicates that there is no overvoltage, undervoltage, overcurrent, or undercurrent.

[0034] Furthermore, the display unit 40 of the embodiment of the present invention can also receive manually input data, i.e., it has a human-computer interaction function. Specifically, the display unit 40 can be used to input specific detection items and the judgment logic of the detection results of the detection unit 40 in the form of code, such as the above-mentioned power allocation algorithm detection and the judgment logic for determining whether the current power allocation complies with the preset power allocation algorithm.

[0035] The DC charger test system according to an embodiment of the present invention implements a DC charger power distribution test through software simulation, resulting in high test efficiency, thereby accelerating the development of DC chargers and speeding up the update and optimization of power distribution control programs. Furthermore, the test cost is low, and consumption or damage to the DC charger hardware can be avoided.

[0036] Based on the test system of the DC charger in the above embodiments, the present invention also proposes a test method for the DC charger.

[0037] As Figure 3 shown, the test method for the DC charger in the embodiments of the present invention includes the following steps:

[0038] S1, Obtain the charging data in the DC charger.

[0039] S2, Perform charging simulation according to the charging data in the DC charger.

[0040] S3, Perform power distribution detection according to the simulation data of the charging simulation.

[0041] Further, as Figure 4 shown, the test method for the DC charger in the embodiments of the present invention may further include:

[0042] S4, Perform overvoltage, undervoltage, overcurrent, and undercurrent detection according to the simulation data of the charging simulation.

[0043] S5, Display the detection results of power distribution and overvoltage, undervoltage, overcurrent, and undercurrent detection.

[0044] In the embodiments of the present invention, the charging data in the DC charger includes all data used for charging simulation obtained from the DC charger, such as the charging control programs of the module control unit, distribution control unit, and charging control unit, the number of power modules, the number of charging guns, etc. The simulation data for performing charging simulation according to the charging data in the DC charger may include the status of the power distribution unit in the DC charger, the status of the output relay, the control data of the power module, the operation data of the power module, and the BMS data received by the DC charger, where the BMS data includes the charging demand.

[0045] Specifically, the power battery and its BMS can be simulated, the battery characteristics can be simulated, and the status of the output relay and the power distribution unit can be simulated under a certain required charging voltage, charging current, and charging power, so as to form a charging circuit, and the voltage, current, and charging power in the charging circuit can be simulated according to the voltage, current, and power of the power module.

[0046] In other embodiments of the present invention, other peripherals can also be simulated according to actual needs. For example, the voltage and current of the electric meter can be simulated according to the voltage, current output by each power module, the status of the output relay, and the simulated battery status (including battery voltage and the status of the battery relay), and then the integral method can be used for power calculation to achieve the simulation of the electric meter.

[0047] In one embodiment of the present invention, when the DC charger performs single-gun or multi-gun charging, it is possible to determine whether the current power distribution conforms to a preset power distribution algorithm according to the state of the power distribution unit in the DC charger and the charging requirements. Specifically, when simulating single-gun or multi-gun charging of the DC charger, first, a power distribution table can be calculated according to the state of the power distribution unit, that is, the correspondence between the numbers of the power supply modules and the numbers of the charging guns. Then, the number of the charging gun that needs to be charged can be obtained according to the charging requirements, and the required power of the charging gun that needs to be charged can be obtained according to the charging requirements. Finally, it is determined whether the number of the charging gun that needs to be charged matches the number of the charging gun in the above power distribution table, and whether the required power of the charging gun that needs to be charged is equal to the total output power of the power supply module corresponding to the charging gun of this number in the above power distribution table. If so, it means that the current power distribution conforms to the preset power distribution algorithm.

[0048] In one embodiment of the present invention, after the state of any one or more charging guns of the DC charger changes, the set output curve can be obtained according to the control data of the power supply module, and the actual output curve can be obtained according to the state of the power distribution unit and the operation data of the power supply module. Furthermore, the set output curve and the actual output curve can be displayed to determine whether the switching of the power distribution is successful. It should be understood that setting to change the state of the charging gun of the DC charger, such as setting one or more charging guns to start or stop charging, is to set to change the output of the DC charger. When the correspondence between the power supply module and the charging gun changes, there will be a process of the power supply module reducing the current and cutting out or the power supply module increasing the voltage and cutting in. At this time, the dynamic adjustment of the voltage and current of the power supply module will be involved, and the actual output voltage, output current, and output power of the DC charger are calculated according to the state of the power distribution unit and the operation data of the power supply module. By displaying the set output curve and the actual output curve in the embodiment of the present invention, it is convenient to compare the two. If the difference between the two is small, it means that the power distribution switching is successful, that is, the switching instruction is successfully received and executed, and there is no risk of faults such as adhesion / out-of-control of the power distribution unit relay during the distribution process. In one embodiment of the present invention, when the DC charger performs single-gun or multi-gun charging, the required output curve can be obtained according to the charging requirements, and the actual output curve can be obtained according to the state of the power distribution unit in the DC charger and the operation data of the power supply module. Furthermore, the required output curve and the actual output curve can be displayed to determine whether there is overvoltage, undervoltage, overcurrent, or undercurrent. By displaying the required output curve and the actual output curve in the embodiment of the present invention, it is convenient to compare the two. If the difference between the two is small, it means that there is no overvoltage, undervoltage, overcurrent, or undercurrent.

[0049] In addition, in the embodiments of the present invention, the specific detection items and the judgment logic of the detection results can be input in the form of code. For example, the above-mentioned power distribution algorithm detection and the judgment logic of determining whether the current power distribution conforms to the preset power distribution algorithm.

[0050] According to the test method of the DC charger of the embodiments of the present invention, the test of the power distribution of the DC charger is realized by means of software simulation. The test efficiency is high, thereby improving the R & D speed of the DC charger, accelerating the update and optimization of the power distribution control program, and the test cost is low, and it can avoid consuming or damaging the hardware of the DC charger.

[0051] In the description of the present invention, "a plurality of" means two or more, unless otherwise specifically defined.

[0052] In the present invention, unless otherwise clearly defined and limited, the terms "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal connection of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0054] Any process or method description shown in the flowchart or described in other ways herein can be understood as representing a module, segment or part of code including one or more executable instructions for implementing a specific logical function or process. The scope of the preferred embodiments of the present invention includes additional implementations, where the functions can be executed in a substantially simultaneous manner or in a reverse order according to the functions involved, rather than in the order shown or discussed, which should be understood by those skilled in the art of the embodiments of the present invention.

[0055] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a definite sequence list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other systems that can fetch instructions from the instruction execution system, apparatus, or device and execute the instructions), or in combination with these instruction execution systems, apparatuses, or devices. For the purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by or in combination with an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium include the following: an electrical connection portion (electronic device) having one or more wirings, a portable computer diskette (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium can even be paper or other suitable medium on which the program can be printed, because the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpretation, or otherwise processing as appropriate, and then storing it in a computer memory.

[0056] It should be understood that various parts of the present invention can be implemented by hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, any one or a combination of the following techniques well known in the art can be used: discrete logic circuits having logic gate circuits for implementing logical functions on data signals, application specific integrated circuits having suitable combinational logic gate circuits, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), etc.

[0057] Those of ordinary skill in the art of this technology can understand that all or part of the steps carried by the method of implementing the above embodiments can be completed by a program instructing relevant hardware, and the program can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiments.

[0058] In addition, each functional unit in various embodiments of the present invention may be integrated into one processing module, may exist separately physically for each unit, or two or more units may be integrated into one module. The above integrated module may be implemented in the form of hardware, or may be implemented in the form of a software functional module. When the above integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0059] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A DC charger test system, characterized in that: include: a communication unit, configured to obtain charging data from the DC charger; a simulation unit, configured to perform charging simulation based on charging data in the DC charger; a detection unit, configured to perform power distribution detection based on simulation data of charging simulation performed by the simulation unit; a display unit, the display unit being used to display the detection result of the detection unit, The simulation data includes the status of the power distribution unit in the DC charger, the status of the output relay, the control data of the power module, the operating data of the power module, and the BMS data received by the DC charger, wherein the BMS data includes the charging demand. The detection unit is specifically used to obtain the set output curve according to the control data of the power module in the DC charger after the status of any one or more charging guns of the DC charger changes, and obtain the actual output curve according to the status of the power distribution unit in the DC charger and the operating data of the power module. The display unit is used to display the set output curve and the actual output curve to determine whether the power distribution switching is successful.

2. The DC charger test system according to claim 1, characterized in that: The detection unit is further used to perform overvoltage, undervoltage, overcurrent and undercurrent detection according to the simulation data of the charging simulation performed by the simulation unit.

3. The DC charger test system according to claim 2, characterized in that: The detection unit is specifically used to determine whether the current power distribution complies with a preset power distribution algorithm according to the state of the power distribution unit in the DC charger and the charging demand when the DC charger performs single-gun or multi-gun charging.

4. The DC charger test system according to claim 2, characterized in that: The detection unit is specifically used to obtain the required output curve according to the charging demand when the DC charger is performing single-gun or multi-gun charging, and to obtain the actual output curve according to the status of the power distribution unit in the DC charger and the operating data of the power module. The display unit is used to display the required output curve and the actual output curve to determine whether there is overvoltage, undervoltage, overcurrent, or undercurrent.

5. A DC charger testing method, characterized in that: The following steps are involved: Acquiring charging data from the DC charger; Performing charging simulation according to the charging data in the DC charger; Perform power distribution detection based on simulation data of charging simulation; Display the detection results of power distribution, The simulation data includes the status of the power distribution unit in the DC charger, the status of the output relay, the control data of the power module, the operating data of the power module, and the BMS data received by the DC charger. Among them, the BMS data includes the charging demand. After the status of any one or more charging guns of the DC charger changes, the set output curve is obtained according to the control data of the power module in the DC charger, and the actual output curve is obtained according to the status of the power distribution unit in the DC charger and the operating data of the power module. The display unit is used to display the set output curve and the actual output curve to determine whether the power distribution switching is successful.

6. The DC charger testing method according to claim 5, characterized in that: Also includes: Overvoltage, undervoltage, overcurrent and undercurrent detection are performed based on the simulation data of the charging simulation.

7. The DC charger testing method according to claim 6, characterized in that: Also includes: Display the detection results of overvoltage, undervoltage, overcurrent and undercurrent.

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