Charging guidance circuit compatible with DC charging standards, electric vehicle charging and discharging simulation device and charging terminal simulation test system

Abstract

The utility model discloses a charging guidance circuit compatible with direct current charging standards, an electric vehicle charging and discharging simulation device and a charging terminal simulation test system, which are applied to the field of electric vehicle charging technology to solve the problem that the electric vehicle charging and discharging simulation device in the prior art cannot be compatible with multiple charging standards. The utility model specifically comprises: a first branch, a second branch, a first switch unit, a second switch unit, a third switch unit and a fourth switch unit; by controlling the switching of each switch unit, the access status of the impedance in the charging guidance circuit can be changed to correspond to the impedance and switch in the guidance circuit of different charging standards, so as to achieve the compatibility of the vehicle side with the access of multiple charging standards, and set the circuit at the input end of the electric vehicle charging and discharging simulation device so that the electric vehicle charging and discharging simulation device is compatible with multiple charging standards, thereby improving the reuse rate of the charging and discharging simulation device on the vehicle side and reducing the cost of independently developing charging and discharging simulation devices of various charging standards.

Description

Technical Field

[0001] The utility model relates to the technical field of electric vehicle charging, and in particular to a charging guidance circuit compatible with a direct current charging standard, an electric vehicle charging and discharging simulation device, and a charging terminal simulation test system. Background Art

[0002] With the development of electric vehicle (EV) charging technology, the current charging standard GB / T27930-2015 can no longer meet the current charging needs, such as high-power charging, V2G, battery heating and PE disconnection protection. Therefore, the shortcomings of the current GB / T27930-2015 standard are optimized to obtain the new charging standards 2015+ and ChaoJi. The 2015+ and ChaoJi standards have changed significantly compared with the current GB / T27930-2015. Currently, there are few electric vehicles compatible with the new standards, which cannot meet the test of the new standard charging piles. The existing charging and discharging simulation device on the electric vehicle side can only realize the access and simulation test based on the GB / T27930-2015 standard, and does not have the access and simulation test functions of the 2015+ and ChaoJi standards. In addition, a charging and discharging simulation device is developed for each standard, which is costly and has low utilization. Utility Model Content

[0003] The embodiments of the utility model provide a charging guidance circuit compatible with DC charging standards, an electric vehicle charging and discharging simulation device and a charging terminal simulation test system, so as to solve the problem that the electric vehicle charging and discharging simulation device in the prior art cannot be compatible with multiple charging standards.

[0004] The technical solution provided by the embodiment of the utility model is as follows:

[0005] On the one hand, the embodiment of the utility model provides a charging guidance circuit compatible with the DC charging standard, which is used in an electric vehicle charging and discharging simulation device, including:

[0006] The first branch includes a first resistor and a first switch unit connected in series; the second branch includes a second resistor;

[0007] A first end of the second switch unit is connected to the first state confirmation line, a second end of the second switch unit is connected to the ground line via the first branch and the second branch respectively, a third end of the second switch unit is connected to the first end of the third switch unit via a third resistor, and a fourth end of the second switch unit is connected to the second end of the third switch unit;

[0008] The third end of the third switch unit is connected to the ground line via the fourth resistor, the fourth end of the third switch unit is connected to the ground line via the fifth resistor, and the fifth end of the third switch unit is connected to the ground line;

[0009] A first end of the fourth switch unit is connected to the external power supply via a sixth resistor, and a second end of the fourth switch unit is connected to the second state confirmation line.

[0010] In a possible implementation, the charging steering circuit compatible with the DC charging standard further includes: a first sampling unit and a second sampling unit;

[0011] The first end of the first switch unit is connected to the first state confirmation line via the first sampling unit; the second end of the fourth switch unit is connected to the second state confirmation line via the second sampling unit.

[0012] On the other hand, an embodiment of the present utility model provides an electric vehicle charging and discharging simulation device, comprising: a charging guidance circuit compatible with the DC charging standard provided in the embodiment of the present utility model, a charging standard input circuit, a battery simulation unit, a test case execution unit, and a central main control unit;

[0013] The power supply end of the charging standard input circuit is connected to the power supply, and the output end of the charging standard input circuit is connected to the first input end of the central main control unit;

[0014] The input end of the charging guidance circuit compatible with the DC charging standard is connected to the external charging terminal, the output end of the charging guidance circuit compatible with the DC charging standard is connected to the input end of the battery simulation unit, and the control end of the charging guidance circuit compatible with the DC charging standard is respectively connected to the first output end of the central main control unit and the first output end of the test case execution unit;

[0015] The first control end of the battery simulation unit is connected to the second output end of the central main control unit, and the second control end of the battery simulation unit is connected to the second output end of the test case execution unit;

[0016] The control end of the test case execution unit is connected to the third output end of the central main control unit.

[0017] In a possible implementation, the battery simulation unit includes: a voltage simulation unit and a load simulation unit;

[0018] The input end of the voltage simulation unit and the input end of the load simulation unit are respectively connected to the output end of the charging guidance circuit compatible with the DC charging standard, the first control end of the voltage simulation unit and the first control end of the load simulation unit are respectively connected to the second output end of the central main control unit, and the second control end of the voltage simulation unit and the second control end of the load simulation unit are connected to the second output end of the test case execution unit.

[0019] In a possible implementation, the electric vehicle charging and discharging simulation device further includes: a BMS communication unit;

[0020] The BMS communication unit is connected to the external charging terminal, and the control end of the BMS communication unit is connected to the fourth output end of the central main control unit.

[0021] In a possible implementation, the electric vehicle charging and discharging simulation device further includes: a background communication unit;

[0022] The background communication unit is connected to the external host computer for communication, and the control end of the background communication unit is connected to the fifth output end of the central main control unit.

[0023] In a possible implementation, the electric vehicle charging and discharging simulation device further includes: a data storage unit;

[0024] The first end of the data storage unit is connected to the output end of the battery simulation unit, the second end of the data storage unit is connected to the sixth output end of the central main control unit, the third end of the data storage unit is connected to the output end of the BMS communication unit, and the fourth end of the data storage unit is connected to the output end of the background communication unit.

[0025] In a possible implementation, the electric vehicle charging and discharging simulation device further includes: at least one non-compatible test interface;

[0026] The input end of each non-compatible test interface is connected to the external charging terminal, and the output end of each non-compatible test interface is connected to the input end of the battery simulation unit.

[0027] In a possible implementation, the electric vehicle charging and discharging simulation device further includes: a display unit;

[0028] The display unit is connected to the seventh output terminal of the central main control unit.

[0029] On the other hand, the embodiment of the utility model provides a charging terminal simulation test system, including: a host computer, a load device and the above-mentioned electric vehicle charging and discharging simulation device provided by the embodiment of the utility model;

[0030] The first end of the electric vehicle charging and discharging simulation device is connected to the host computer, the second end of the electric vehicle charging and discharging simulation device is connected to the load device, and the third end of the electric vehicle charging and discharging simulation device is connected to the external charging terminal; the electric vehicle charging and discharging simulation device uses the load device as the charging load according to the test cases and test data input by the host computer, simulates the charging and discharging process of the vehicle connected to the external charging terminal and tests it.

[0031] The beneficial effects of the embodiments of the utility model are as follows:

[0032] In an embodiment of the utility model, a guidance circuit compatible with DC charging standards is proposed, including: a first branch, a second branch, a first switch, a second switch, a third switch and a fourth switch, which are connected to a first state confirmation line, a second state confirmation line and a ground line of a charging terminal. By controlling the switching of the first switch unit, the second switch unit and the third switch unit, the access status of the impedance in the charging guidance circuit can be changed to correspond to the impedance and connection relationship in the standard guidance circuit of different charging standards including national standards 2015, 2015+ and ChaoJi, so as to achieve compatibility of the electric vehicle side with multiple charging standards of different charging terminals. The charging guidance circuit compatible with DC charging standards is set at the input end of the electric vehicle charging and discharging simulation device, so that the electric vehicle charging and discharging simulation device is compatible with the access of charging terminals with multiple charging standards, thereby improving the reuse rate of the charging and discharging simulation device on the electric vehicle side and reducing the cost of independently developing charging and discharging simulation devices of various charging standards.

[0033] Other features and advantages of the utility model will be described in the subsequent description, and partly will become apparent from the description, or understood by practicing the utility model. The purpose and other advantages of the utility model can be realized and obtained by the structures specifically pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0035] Figure 1 This is a schematic diagram of a first circuit structure of a charging guidance circuit compatible with DC charging standards in an embodiment of the utility model;

[0036] Figure 2 This is a schematic diagram of a second circuit structure of a charging guidance circuit compatible with DC charging standards in an embodiment of the present utility model;

[0037] Figure 3 This is a schematic diagram of the circuit structure of a charging guidance circuit compatible with the DC charging standard in an embodiment of the utility model working in the national standard 2015 mode;

[0038] Figure 4 The interface guide circuit diagram of the Chinese Standard 2015 of the embodiment of the utility model;

[0039] Figure 5 A schematic diagram of the circuit structure of a charging guidance circuit compatible with DC charging standards in an embodiment of the present utility model working in the national standard 2015+ mode;

[0040] Figure 6 The interface guide circuit diagram of the Chinese Standard 2015+ of the embodiment of the utility model;

[0041] Figure 7 This is a schematic diagram of the circuit structure of a charging guidance circuit compatible with DC charging standards in an embodiment of the utility model working in the national standard ChaoJi mode;

[0042] Figure 8 The interface guide circuit diagram of the Chinese standard ChaoJi of the embodiment of the utility model;

[0043] Fig. 9 This is a schematic diagram of a third circuit structure of a charging guidance circuit compatible with DC charging standards in an embodiment of the present utility model;

[0044] Fig.10 This is a schematic diagram of the first structure of the electric vehicle charging and discharging simulation device in the embodiment of the utility model;

[0045] Fig.11 This is a second structural schematic diagram of the electric vehicle charging and discharging simulation device in the embodiment of the utility model;

[0046] Fig.12 This is a third structural schematic diagram of the electric vehicle charging and discharging simulation device in the embodiment of the utility model;

[0047] Fig.13 This is a schematic diagram of a fourth structure of the electric vehicle charging and discharging simulation device in an embodiment of the utility model;

[0048] Fig.14 This is a fifth structural schematic diagram of the electric vehicle charging and discharging simulation device in the embodiment of the utility model;

[0049] Fig.15 This is a sixth structural schematic diagram of the electric vehicle charging and discharging simulation device in the embodiment of the utility model;

[0050] Fig.16 This is a seventh structural schematic diagram of the electric vehicle charging and discharging simulation device in the embodiment of the utility model;

[0051] Fig.17 This is a schematic diagram of the eighth structure of the electric vehicle charging and discharging simulation device in the embodiment of the utility model;

[0052] Fig.18 Schematic diagram of the structure of the charging terminal simulation test system in the embodiment of the utility model. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0054] The present invention provides a charging guide circuit compatible with DC charging standards, which is applied to an electric vehicle charging and discharging simulation device. Figure 1 As shown, the charging guidance circuit 100 compatible with the DC charging standard provided by the embodiment of the utility model at least includes: a first switch unit 110, a second switch unit 120, a third switch unit 130, a fourth switch unit 140, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6;

[0055] The first branch includes a first resistor R1 and a first switch unit 110 connected in series; the second branch includes a second resistor R2;

[0056] A first end of the second switch unit 120 is connected to the first state confirmation line, a second end of the second switch unit 120 is connected to the ground line via the first branch and the second branch respectively, a third end of the second switch unit 120 is connected to a first end of the third switch unit 130 via a third resistor R3, and a fourth end of the second switch unit 120 is connected to a second end of the third switch unit 130;

[0057] The third end of the third switch unit 130 is connected to the ground line via the fourth resistor R4, the fourth end of the third switch unit 130 is connected to the ground line via the fifth resistor R5, and the fifth end of the third switch unit 130 is connected to the ground line;

[0058] A first end of the fourth switch unit 140 is connected to the external power source via the sixth resistor R6 , and a second end of the fourth switch unit 140 is connected to the second state confirmation line.

[0059] exist Figure 1In the charging guidance circuit compatible with the DC charging standard shown, the resistance value of each resistor needs to be set according to the impedance value in the DC charging standard compatible with the circuit. The first switch unit 110 is used to connect or disconnect the first branch. The second switch unit 120 is used to connect the first state confirmation line with the third resistor R3, or to connect the first state confirmation line with the first branch, the second branch and the first end of the third switch unit 130. The third switch unit 130 is used to connect the fourth resistor R4 and / or the fifth resistor R5 with the second switch unit 120, or to disconnect the fourth resistor R4 and / or the fifth resistor R5 with the second switch unit 120. The fourth switch unit 140 is used to connect or disconnect the second state confirmation line with the external power supply. The control ends of the first switch unit 110, the second switch unit 120, the third switch unit 130 and the fourth switch unit 140 can be connected to the output end of the external central control unit so that the external central control unit controls the switching of each switch unit. Since the number and resistance values ​​of resistors in the steering circuits of different DC charging standards in the national standard are different, by switching the first switch unit 110, the second switch unit 120, the third switch unit 130, and the fourth switch unit 140, it is possible to change whether the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, and the sixth resistor R6 are connected and their connection relationship.

[0060] In this way, by controlling the switching of the first switch unit, the second switch unit, the third switch unit and the fourth switch unit, the access status of the impedance in the charging guidance circuit can be changed to correspond to the impedance and connection dry cleaning in the standard guidance circuit of different charging standards in the national standards including 2015, 2015+, and ChaoJi, so as to achieve compatibility of the electric vehicle side with multiple charging standards, and set the charging guidance circuit compatible with the DC charging standard at the input end of the electric vehicle charging and discharging simulation device, so that the electric vehicle charging and discharging simulation device is compatible with multiple charging standards, thereby improving the reuse rate of the charging and discharging simulation device on the electric vehicle side and reducing the cost of independently developing charging and discharging simulation devices for various charging standards.

[0061] In specific implementation, in the charging steering circuit compatible with the DC charging standard provided in the embodiment of the present application, the first switch unit, the second switch unit, the third switch unit and the fourth switch unit can have a variety of specific structures to realize their functions. Figure 2As shown, the first switch unit, the second switch unit and the fourth switch unit all include a single-pole double-throw switch, and the third switch unit includes a double-pole double-throw switch. In the first switch unit, the moving contact of the switch K1 is connected to the first static contact of the switch K2 of the second switch unit, the first static contact of the switch K1 is connected to the first resistor, and the second static contact of the switch K1 is suspended. In the second switch unit, the moving contact of the switch K2 is connected to the first state confirmation line, the first static contact of the switch K2 is also connected to the second resistor and the first moving contact of the switch K3 of the third switch unit, respectively, and the second static contact of the switch K2 is connected to the second moving contact of the switch K3 of the third switch unit via the third resistor. In the third switch unit, the first static contact of switch K3 is connected to the ground wire via the fifth resistor, the second static contact of switch K3 is suspended, the third static contact of switch K3 is connected to the ground wire via the fourth resistor, and the fourth static contact of switch K3 is connected to the ground wire. In the fourth switch unit, the moving contact of switch K4 is connected to the external power supply via the sixth resistor, the first static contact of switch K4 is connected to the second state confirmation line, and the second static contact of switch K4 is suspended.

[0062] based on Figure 2 The charging guidance circuit compatible with the DC charging standard shown is taken as an example to introduce the working mode of the charging guidance circuit compatible with the DC charging standard, taking the compatible charging standards including GB 2015, GB 2015+ and GB ChaoJi as examples.

[0063] The first working mode: the charging pilot circuit compatible with the DC charging standard works in the national standard 2015 mode.

[0064] See also Figure 3 As shown, in the national standard 2015 mode, switches K2 and K3 are in the default state, and switch K4 is closed, that is, the moving contact of switch K2 is connected to the second static contact of switch K2, the first moving contact of switch K3 is connected to the second static contact of switch K3, the second moving contact of switch K3 is connected to the fourth static contact of switch K3, and the moving contact of switch K4 is connected to the first static contact of switch K4. Figure 4 The following is the charging interface guidance circuit diagram of the national standard 2015. Figure 3 The third resistor R3 and Figure 4 The resistance value of the resistor R4 is the same. Figure 3 The resistance value of the sixth resistor R6 is Figure 4 The resistance of the resistor R5 is the same as that of Figure 4 The steering circuits of the first state confirmation line CC1 and the second state confirmation line CC2 are completely consistent.

[0065] The second working mode: The charging pilot circuit compatible with the DC charging standard works in the national standard 2015+ mode.

[0066] See also Figure 5As shown, in the national standard 2015+ mode, the switch K2 is in a default state, that is, the moving contact of the switch K2 is connected to the second static contact of the switch K2, and the switch K3 and the switch K4 operate according to the charging sequence. Figure 6 The figure shows the charging interface conductive circuit diagram of the national standard 2015+. Figure 5 The third resistor R3 and Figure 6 The resistance value of the resistor R4 is the same. Figure 5 The fourth resistor R4 and Figure 6 The resistance value of the resistor R6 is the same. Figure 5 The resistance value of the sixth resistor R6 is Figure 6 The resistance value of the second state detection resistor R5 is the same as that of Figure 6 The steering circuits of the first state confirmation line CC1 and the second state confirmation line CC2 are completely consistent.

[0067] The third working mode: The charging guidance circuit compatible with the DC charging standard works in the national standard ChaoJi mode.

[0068] See also Figure 7 As shown, in the GB 2015+ mode, the switch K2 is in a closed state, that is, the moving contact of the switch K2 connects to the first static contact of the switch K2, and the switches K1, K3 and K4 operate according to the charging sequence. Figure 8 The figure shows the conductive circuit diagram of the charging interface of the national standard ChaoJi. Figure 7 The first resistor R1 and the switch K1 are connected to Figure 8 The middle resistor R4 is the same as the switch S2. Figure 7 The fifth resistor R5 and the switch K3 are connected to Figure 8 The resistor R4′ and switch S2′ are the same. Figure 7 The resistance value of the sixth resistor R6 is Figure 8 The resistance of the resistor Rv is the same, and the circuit formed is Figure 8 The steering circuits of the first state confirmation line CC1 and the second state confirmation line CC2 are completely consistent.

[0069] In this way, by controlling the switching of switch K1, switch K2, switch K3 and switch K4, the impedance and connection relationship in the standard guidance circuit corresponding to the different charging standards in the national standards including 2015, 2015+, and ChaoJi can be achieved, thereby achieving compatibility of the electric vehicle side with multiple charging standards.

[0070] In one embodiment, see Fig. 9 As shown, the charging steering circuit compatible with the DC charging standard provided in the embodiment of the present application may also be provided with: a first sampling unit 150 and a second sampling unit 160;

[0071] A first end of the second switch unit 120 is connected to the first state confirmation line via the second sampling unit; a second end of the fourth switch unit 140 is connected to the second state confirmation line via the second sampling unit 160 .

[0072] exist Fig. 9 In the charging guidance circuit compatible with the DC charging standard shown, the first sampling unit 150 is used to collect the voltage value and current value of the first state confirmation line CC1 input; the second sampling unit 160 is used to collect the voltage value and current value of the second state confirmation line CC2 input. The first sampling unit 150 and the second sampling unit 160 are both provided with a voltage collection element and a current collection element, wherein the voltage collection element can be one or more of a resistor divider, a Hall effect sensor, and a capacitive coupling sensor, and the current collection element can be one or more of a current transformer, a resistor shunt, and a Hall current sensor.

[0073] Based on the same concept, the present utility model also provides an electric vehicle charging and discharging simulation device, see Fig.10 As shown, the electric vehicle charging and discharging simulation device 200 includes: the charging guidance circuit 100 compatible with the DC charging standard provided by the embodiment of the utility model, a charging standard input circuit 210, a battery simulation unit 220, a test case execution unit 230 and a central main control unit 240;

[0074] The power supply end of the charging standard input circuit 210 is connected to the power supply, and the output end of the charging standard input circuit 210 is connected to the first input end of the central main control unit 240;

[0075] The input end of the charging guidance circuit 100 compatible with the DC charging standard is connected to the external charging terminal, the output end of the charging guidance circuit 100 compatible with the DC charging standard is connected to the input end of the battery simulation unit 220, and the control end of the charging guidance circuit 100 compatible with the DC charging standard is respectively connected to the first output end of the central main control unit 240 and the first output end of the test case execution unit 230;

[0076] The first control terminal of the battery simulation unit 220 is connected to the second output terminal of the central main control unit 240, and the second control terminal of the battery simulation unit 220 is connected to the second output terminal of the test case execution unit 230;

[0077] The control end of the test case execution unit 230 is connected to the third output end of the central main control unit 240 .

[0078] exist Fig.10In the electric vehicle charging and discharging simulation device 200 shown, the charging standard input circuit 210 is used to receive charging standard data input from the outside, and transmit the charging standard to the central main control unit 240, so that the central main control unit 240 can identify the current charging standard according to the input charging standard data, and the central main control unit 240 controls the switching of each switch unit in the charging guidance circuit 100 compatible with the DC charging standard according to the current charging standard. Under the control of the central main control unit 240, the charging guidance circuit 100 compatible with the DC charging standard switches the corresponding switch unit to obtain the charging guidance circuit of the corresponding charging standard. The battery simulation unit 220 is used to simulate the voltage value of the battery during real-time charging according to the charging parameters input by the central main control unit 240, and is also used to simulate the battery of the electric vehicle, receiving the charging current input by the external charging terminal for charging or outputting the discharge current for discharging. The test case execution unit 230 includes different test cases for different charging standards. The test case execution unit 230 is used to perform relevant tests of the communication protocol and simulated faults according to the current charging standard, charging parameters, selected test cases and test modes input by the central main control unit 240, wherein the test mode refers to all test case tests and single test case tests. The central main control unit 240 is used to receive external input charging standard data and charging parameters, identify the current charging standard according to the charging standard data, and control the action of the switch unit in the charging guidance circuit 100 compatible with the DC charging standard according to the current charging standard, and is also used to control the battery simulation unit 220 and the test case execution unit 230 according to the relevant setting parameters input by the user.

[0079] In this way, by setting a charging guidance circuit compatible with the DC charging standard, the electric vehicle charging and discharging simulation device 200 can be compatible with external charging terminals to be tested with different charging standards, thereby improving the reuse rate of the charging and discharging simulation device on the electric vehicle side. The electric vehicle charging and discharging simulation device 200 tests charging terminals with multiple charging standards of various charging systems, thereby improving test efficiency, reducing test costs, and shortening test time.

[0080] Specifically, the charging standard input circuit 210 has a variety of structures to achieve its functions, see Fig.11 As shown, the charging standard input circuit 210 may specifically include: a seventh resistor R7, an eighth resistor R8, a fifth switch K5 and a sixth switch K6;

[0081] A first end of the seventh resistor R7 is connected to an external power source, a second end of the seventh resistor R7 is connected to a first end of the fifth switch K5 and an input end of the central main control unit 240 respectively; a second end of the fifth switch K5 is connected to a ground line;

[0082] A first end of the eighth resistor R8 is connected to an external power source, a second end of the eighth resistor R8 is connected to a first end of the sixth switch K6 and an input end of the central main control unit 240 respectively; and a second end of the sixth switch K6 is connected to the ground line.

[0083] exist Fig.11 In the electric vehicle charging and discharging simulation device 200 shown, the fifth switch K5 and the sixth switch K6 can be one of a dip switch, a relay or a triode. The opening or closing of the fifth switch K5 and the sixth switch K6 can be controlled by an external control signal or manually controlled. The switching states of the fifth switch K5 and the sixth switch K6 are different, and the high and low levels input to the central main control unit 240 are different. Each level input to the central main control unit 240 is pre-set to correspond to a DC charging standard, so as to receive the charging standard data input from the outside, and transmit the charging standard data to the central main control unit 240. The central main control unit 240 identifies the corresponding charging standard according to the input level.

[0084] In specific implementation, in the electric vehicle charging and discharging simulation device 200 provided in the embodiment of the present application, the battery simulation unit 220 has a variety of structures to realize its functions, such as Fig.12 As shown, the battery simulation unit 220 may specifically include: a voltage simulation unit 221 and a load simulation unit 222;

[0085] The input end of the voltage simulation unit 221 and the input end of the load simulation unit 222 are respectively connected to the output end of the charging guidance circuit 100 compatible with the DC charging standard, the first control end of the voltage simulation unit 221 and the first control end of the load simulation unit 222 are respectively connected to the second output end of the central main control unit 240, and the second control end of the voltage simulation unit 221 and the second control end of the load simulation unit 222 are connected to the second output end of the test case execution unit 230.

[0086] exist Fig.12 In the electric vehicle charging and discharging simulation device 200 shown, the voltage simulation unit 221 is used to simulate the voltage value of the battery when it is charged in real time, and the battery simulation unit 220 is used to simulate the battery of the electric vehicle, receiving the charging current input by the external charging terminal for charging or outputting the discharging current for discharging. The battery simulation unit 220 can be a lithium battery pack or a bidirectional AC / DC converter circuit.

[0087] In one embodiment, see Fig.13 As shown, the electric vehicle charging and discharging simulation device 200 further includes: a BMS communication unit 250;

[0088] The BMS communication unit 250 is connected to the external charging terminal, and the control end of the BMS communication unit 250 is connected to the fourth output end of the central main control unit 240 .

[0089] exist Fig.13 In the electric vehicle charge and discharge simulation device 200 shown, the BMS communication unit 250 is used to achieve communication between the external charging terminal and the electric vehicle charge and discharge simulation device 200 according to a standard protocol corresponding to the charging standard.

[0090] In one embodiment, see Fig.14 As shown, the electric vehicle charging and discharging simulation device 200 further includes: a background communication unit 260;

[0091] The background communication unit 260 is connected to the external host computer for communication, and the control end of the background communication unit 260 is connected to the fifth output end of the central main control unit 240 .

[0092] exist Fig.14 In the electric vehicle charging and discharging simulation device 200 shown, the background communication unit 260 is connected to the external host computer by wire or wirelessly. Specifically, the background communication unit 260 can be connected to the external host computer by wire through a serial interface or parallel interface preset in the device. The background communication unit 260 can also be connected to the external host computer wirelessly through a wireless communication interface or Ethernet interface preset in the device. The background communication unit 260 is used to communicate with the external host computer, that is, to communicate with the background software in the external host computer, to realize data interaction between the background and the electric vehicle charging and discharging simulation device 200. The electric vehicle charging and discharging simulation device 200 can send charging process data, charging standards, working status of the external charging terminal and other data to the external host computer through the background communication unit 260.

[0093] In one embodiment, see Fig.15 As shown, the electric vehicle charging and discharging simulation device 200 further includes: a data storage unit 270;

[0094] The first end of the data storage unit 270 is connected to the output end of the battery simulation unit 220, the second end of the data storage unit 270 is connected to the sixth output end of the central main control unit 240, the third end of the data storage unit 270 is connected to the output end of the BMS communication unit 250, and the fourth end of the data storage unit 270 is connected to the output end of the background communication unit 260.

[0095] exist Fig.15In the electric vehicle charging and discharging simulation device 200 shown, the data storage unit 270 is used to store the voltage value and load data of the battery simulated by the battery simulation unit 220 during real-time charging, the data input by the external charging terminal connected to the BMS communication unit 250, and the data input by the external host computer connected to the background communication unit 260; the data storage unit 270 is also used to send the data stored therein to the BMS communication unit 250 or the background communication unit 260 under the control of the central main control unit 240.

[0096] In one embodiment, see Fig.16 As shown, the electric vehicle charging and discharging simulation device 200 further includes: at least one non-compatible test interface 280;

[0097] An input end of each non-compatible test interface is connected to an external charging terminal, and an output end of each non-compatible test interface is connected to an input end of the battery simulation unit 220 .

[0098] exist Fig.16 In the charging guidance circuit 100 compatible with the DC charging standard shown, at least one non-compatible test interface 280 can be provided to match other incompatible foreign charging standards. Specifically, the electric vehicle charging and discharging simulation device 200 can be provided with a CCS interface to implement the interface guidance of the European charging standard; the electric vehicle charging and discharging simulation device 200 can also be provided with a CHAdeMO interface to implement the interface guidance of the Japanese charging standard.

[0099] In one embodiment, see Fig.17 As shown, the electric vehicle charging and discharging simulation device 200 further includes: a display unit 290;

[0100] The display unit 290 is connected to the seventh output terminal of the central control unit 240 .

[0101] exist Fig.17 In the charging guidance circuit 100 compatible with the DC charging standard shown, the display unit 290 is used to display the voltage value and load data of the battery during charging simulated by the battery simulation unit 220, the working status data of the external charging terminal input by the external charging terminal, the charging standard, the charging parameters and other data.

[0102] In one embodiment, the electric vehicle charging and discharging simulation device 200 further includes: a power supply and a parameter setting module. The power supply is connected to each module in the electric vehicle charging and discharging simulation device 200, and the power supply is used to supply power to each module in the electric vehicle charging and discharging simulation device 200. The parameter setting module is used to set static data such as the simulated battery voltage value and load data of the battery simulation unit in the electric vehicle charging and discharging simulation device 200, the display mode of the display unit, and the data displayed by the display unit.

[0103] Based on the same concept, the present utility model embodiment also provides a charging terminal simulation test system, see Fig.18 As shown, the charging terminal simulation test system 300 includes: a host computer 310, a load device 320 and the above-mentioned electric vehicle charging and discharging simulation device 200 provided in the embodiment of the utility model;

[0104] The first end of the electric vehicle charging and discharging simulation device 200 is connected to the host computer 310, the second end of the electric vehicle charging and discharging simulation device 200 is connected to the load device 320, and the third end of the electric vehicle charging and discharging simulation device 200 is connected to the external charging terminal; the electric vehicle charging and discharging simulation device 200 uses the load device 320 as the charging load according to the test cases and test data input by the host computer 310, simulates the charging and discharging process of the electric vehicle connected to the external charging terminal and tests it.

[0105] In specific implementation, when the load device is not connected, the specific implementation process of the charging terminal simulation test system for testing is as follows:

[0106] Step 1: Open the background software in the host computer and set the charging mode and charging parameters;

[0107] Step 2: Select the data recording and storage function to record the test data;

[0108] Step 3: Select the corresponding test case according to the charging mode, click the test case for a single test or click all tests, and when ready, you can charge;

[0109] Step 4: Select the charging pile of the corresponding standard. After the plug-in connection is completed, click Charge on the charging pile side;

[0110] Step 5: You can view the charging status and test process in real time on the background software.

[0111] Step 6: After the test is completed, you can view the test results on the background.

[0112] When the load device is connected, the specific implementation process of the charging terminal simulation test system is as follows:

[0113] Step 1: Open the background software in the host computer and set the charging mode and charging parameters;

[0114] Step 2: Adjust the external load size according to the parameter settings.

[0115] Step 3: Select the data recording and storage function to record the test data;

[0116] Step 4: Select the corresponding test case according to the charging mode, click All Tests, and then charge when ready;

[0117] Step 5: Select the charging pile of the corresponding standard. After the gun is connected, click Charge on the charging pile side;

[0118] Step 6: The charging status and test process can be viewed in real time on the background software in the host computer.

[0119] Step 7: After the test is completed, you can view the test results on the background of the host computer.

[0120] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present invention.

[0121] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. Thus, if these modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A charging guidance circuit compatible with DC charging standards, used in an electric vehicle charging and discharging simulation device, characterized in that: include: The first branch includes a first resistor and a first switch unit connected in series; The second branch includes a second resistor; A first end of the second switch unit is connected to the first state confirmation line, a second end of the second switch unit is connected to the ground line via the first branch and the second branch respectively, a third end of the second switch unit is connected to the first end of the third switch unit via a third resistor, and a fourth end of the second switch unit is connected to the second end of the third switch unit; The third end of the third switch unit is connected to the ground line via a fourth resistor, the fourth end of the third switch unit is connected to the ground line via a fifth resistor, and the fifth end of the third switch unit is connected to the ground line; A first end of the fourth switch unit is connected to an external power source via a sixth resistor, and a second end of the fourth switch unit is connected to a second state confirmation line.

2. The charging steering circuit compatible with the DC charging standard according to claim 1, characterized in that: Also includes: a first sampling unit and a second sampling unit; The first end of the second switch unit is connected to the first state confirmation line via the first sampling unit; The second end of the fourth switch unit is connected to the second state confirmation line via the second sampling unit.

3. An electric vehicle charging and discharging simulation device, characterized in that: include: A charging guidance circuit compatible with a DC charging standard, a charging standard input circuit, a battery simulation unit, a test case execution unit, and a central main control unit as described in any one of claims 1 to 2; The power supply end of the charging standard input circuit is connected to an external power supply, and the output end of the charging standard input circuit is connected to the first input end of the central main control unit; The input end of the charging guidance circuit compatible with the DC charging standard is connected to the external charging terminal, the output end of the charging guidance circuit compatible with the DC charging standard is connected to the input end of the battery simulation unit, and the control end of the charging guidance circuit compatible with the DC charging standard is respectively connected to the first output end of the central main control unit and the first output end of the test case execution unit; The first control end of the battery simulation unit is connected to the second output end of the central main control unit, and the second control end of the battery simulation unit is connected to the second output end of the test case execution unit; The control end of the test case execution unit is connected to the third output end of the central main control unit.

4. The electric vehicle charging and discharging simulation device according to claim 3, characterized in that: The battery simulation unit includes: a voltage simulation unit and a load simulation unit; The input end of the voltage simulation unit and the input end of the load simulation unit are respectively connected to the output end of the charging guidance circuit compatible with the DC charging standard, the first control end of the voltage simulation unit and the first control end of the load simulation unit are respectively connected to the second output end of the central main control unit, and the second control end of the voltage simulation unit and the second control end of the load simulation unit are connected to the second output end of the test case execution unit.

5. The electric vehicle charging and discharging simulation device according to claim 3, characterized in that: Also includes: BMS communication unit; The BMS communication unit is connected to an external charging terminal, and a control end of the BMS communication unit is connected to a fourth output end of the central main control unit.

6. The electric vehicle charging and discharging simulation device according to claim 5, characterized in that: Also includes: Background communication unit; The background communication unit is connected to the external host computer for communication, and the control end of the background communication unit is connected to the fifth output end of the central main control unit.

7. The electric vehicle charging and discharging simulation device according to claim 6, characterized in that: Also includes: Data storage unit; The first end of the data storage unit is connected to the output end of the battery simulation unit, the second end of the data storage unit is connected to the sixth output end of the central main control unit, the third end of the data storage unit is connected to the output end of the BMS communication unit, and the fourth end of the data storage unit is connected to the output end of the background communication unit.

8. The electric vehicle charging and discharging simulation device according to any one of claims 3 to 7, characterized in that: include: at least one non-compliant test interface; The input end of each of the non-compatible test interfaces is connected to an external charging terminal, and the output end of each of the non-compatible test interfaces is connected to the input end of the battery simulation unit.

9. The electric vehicle charging and discharging simulation device according to claim 8, characterized in that: include: Display unit; The display unit is connected to the seventh output terminal of the central main control unit.

10. A charging terminal simulation test system, characterized in that: include: A host computer, a load device, and an electric vehicle charging and discharging simulation device as claimed in any one of claims 3 to 9; The first end of the electric vehicle charging and discharging simulation device is connected to the host computer, the second end of the electric vehicle charging and discharging simulation device is connected to the load device, and the third end of the electric vehicle charging and discharging simulation device is connected to the external charging terminal; the electric vehicle charging and discharging simulation device uses the load device as the charging load according to the test cases and test data input by the host computer to simulate and test the charging and discharging process of the electric vehicle connected to the external charging terminal.

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