Inversion-based vehicle-to-vehicle alternating current charging control system and method

Abstract

The invention discloses an inversion-based vehicle-to-vehicle alternating current charging control system and method, the system comprises a power supply vehicle and a charging vehicle, the power supply vehicle is equipped with a first vehicle-mounted charger with an inversion function, the charging vehicle is equipped with a second vehicle-mounted charger with / without an inversion function, the first vehicle-mounted charger is equipped with a power supply interface, and the second vehicle-mounted charger is equipped with a second power supply interface. The second vehicle-mounted charger is provided with a charging interface, and the power supply interface and the charging interface are connected through an emergency charging gun. On the basis of an original rectifying circuit of a vehicle-mounted charger, a CP duty ratio sending function is added, working mode judgment is carried out according to CC resistance value, inversion modes (a pure discharging mode and an emergency charging mode) of a vehicle are determined by arranging a CP monitoring circuit and voltage judgment of a sampling point, and vehicle-to-vehicle alternating current charging control is achieved; and meanwhile, charging control can still be performed on the basis of cancelling an original emergency charging gun control box, so that the cost is saved, and the automation degree of vehicle-to-vehicle charging is improved at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic appliances, and in particular to an inverter-based vehicle-to-vehicle AC charging control system and method. Background Art

[0002] With the rapid development of new energy vehicles, pure electric vehicles have also seen explosive growth. The short range of electric vehicles on the market has caused great trouble to users, limiting the popularity of electric vehicles and user experience. In particular, the popularity of charging piles in the market is not comprehensive, and the emergency charging capacity is weak.

[0003] The prior art generally adopts a vehicle-to-vehicle charging device, which includes an on-board charger, a charging and discharging connection device and a control box; a switch is provided on the control box to control the on and off of the charging current, and the degree of automation is low; and the cost is high due to the addition of the control box. Summary of the invention

[0004] In view of the problem of low automation level of vehicle-to-vehicle charging in the prior art, the present invention proposes a vehicle-to-vehicle AC charging control system and method based on inverter, which determines whether to perform automatic charging by setting a CP monitoring circuit and the voltage of a sampling point, thereby eliminating the manual operation of the control box and improving the automation level.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A vehicle-to-vehicle AC charging control system based on inverter includes a power supply vehicle and a charging vehicle, the power supply vehicle is equipped with a first vehicle-mounted charger with an inverter function, the charging vehicle is equipped with a second vehicle-mounted charger, the first vehicle-mounted charger is provided with a power supply interface, the second vehicle-mounted charger is provided with a charging interface, and the power supply interface and the charging interface are connected through an emergency charging gun.

[0007] Preferably, the second on-board charger has or does not have an inverter function.

[0008] Preferably, the first on-board charger is provided with a first PE line, a first CC signal line and a first CP signal line;

[0009] One end of the first CC signal line is connected to one end of the first CC signal interface in the power supply interface, the other end of the first CC signal interface is connected to one end of the first PE line through the first resistor, the other end of the first PE line is grounded, and the other end of the first CC signal line is connected to the first CC sampling point.

[0010] Preferably, one end of the first CP signal line is connected to the first CP signal interface in the power supply interface, the other end of the first CP signal line is connected to one end of the third switch, and the other end of the third switch is connected to the first CP detection circuit.

[0011] Preferably, the specific connection relationship of the first CP detection circuit is:

[0012] The CPOUT terminal is respectively connected to one end of the second resistor and the positive electrode of the second diode; the other end of the second resistor is respectively connected to one end of the third resistor and the collector of the first transistor, the other end of the third resistor is connected to the negative electrode of the first diode, the positive electrode of the first diode is connected to the 12V voltage, the base of the first transistor is connected to the control end of the MCU of the first on-board charger, the emitter of the first transistor is connected to one end of the fourth resistor, and the other end of the fourth resistor is connected to the -5V voltage; the negative electrode of the second diode is connected to one end of the fifth resistor, the other end of the fifth resistor is connected to one end of the sixth resistor, the other end of the sixth resistor is grounded, and a second CP sampling point is set between the fifth resistor and the sixth resistor;

[0013] The CPIN end is connected to one end of the seventh resistor and one end of the ninth resistor respectively, the other end of the seventh resistor is connected to one end of the eighth resistor, the other end of the eighth resistor is grounded, and the other end of the ninth resistor is grounded through the fourth switch; a first CP sampling point is set between the seventh resistor and the eighth resistor.

[0014] Preferably, the second on-board charger is provided with a second PE line, a second CC signal line and a second CP signal line;

[0015] One end of the second CC signal line is connected to one end of the second CC signal interface in the charging interface, the other end of the second CC signal interface is connected to one end of the eleventh resistor, the other end of the eleventh resistor is respectively connected to one end of the tenth resistor and one end of the fifth switch, the other end of the tenth resistor and the other end of the fifth switch are respectively connected to one end of the second PE line, and the other end of the second PE line is grounded; the other end of the second CC signal line is connected to the second CC sampling point.

[0016] Preferably, one end of the second CP signal line is connected to the second CP signal interface in the charging interface, the other end of the second CP signal line is connected to one end of the eighth switch, and the other end of the eighth switch is connected to the second CP detection circuit.

[0017] Preferably, the specific connection relationship of the second CP detection circuit is:

[0018] The CPOUT terminal is respectively connected to one end of the seventeenth resistor and the positive electrode of the third diode; the other end of the seventeenth resistor is respectively connected to one end of the eighteenth resistor and the collector of the second transistor, the other end of the eighteenth resistor is connected to the negative electrode of the fourth diode, the positive electrode of the fourth diode is connected to the 12V voltage, the base of the second transistor is connected to the control end of the MCU of the second on-board charger, the emitter of the second transistor is connected to one end of the nineteenth resistor, and the other end of the nineteenth resistor is connected to the -5V voltage; the negative electrode of the third diode is connected to one end of the fifteenth resistor, the other end of the fifteenth resistor is connected to one end of the sixteenth resistor, the other end of the sixteenth resistor is grounded, and a fourth CP sampling point is set between the fifteenth resistor and the sixteenth resistor;

[0019] The CPIN end is respectively connected to one end of the twelfth resistor and one end of the fourteenth resistor, the other end of the twelfth resistor is connected to one end of the thirteenth resistor, the other end of the thirteenth resistor is grounded, and the other end of the fourteenth resistor is grounded through the ninth switch; a third CP sampling point is set between the twelfth resistor and the thirteenth resistor;

[0020] or:

[0021] One end of the second CP signal line is connected to the second CP signal interface in the charging interface, and the other end of the second CP signal line is respectively connected to one end of the twelfth resistor and one end of the fourteenth resistor, the other end of the twelfth resistor is grounded, and the other end of the fourteenth resistor is grounded through the ninth switch; a third CP sampling point is set between the second CP signal interface and the twelfth resistor and the fourteenth resistor.

[0022] The present invention also provides a vehicle-to-vehicle AC charging control method based on inverter, which specifically includes the following steps:

[0023] S1: Connect the first onboard charger of the power supply vehicle and the second onboard charger of the charging vehicle through an emergency charging gun. After being awakened by the CC signal, the first onboard charger continuously sends the CP signal to the second onboard charger; the second onboard charger continuously detects the CC signal and the CP signal;

[0024] S2: The first on-board charger identifies the resistance value of the first CC resistor in the power supply interface, and determines the corresponding state classification and connection state; if the connection state is fully connected, enter S3; if the connection state is half-connected or not connected, repeat S2;

[0025] S3: The first on-board charger is in the inverter mode, and the inverter mode is judged by identifying the voltage of the second CP sampling point; if it is in the pure discharge mode, it is directly discharged; if it is in the emergency charging mode, it enters S4;

[0026] S4: The first on-board charger continuously sends a PWM signal. When the CC signal confirms that the connection is successful, the first switch and the second switch are controlled to close. The first rectifier circuit converts the DC output of the battery of the power supply vehicle into AC power, and outputs it to the charging interface of the charging vehicle through the emergency charging gun.

[0027] S5: The second on-board charger on the charging vehicle identifies the resistance value of the second CC resistor in the charging interface, and determines the corresponding state classification and connection state; when the connection state is in a fully connected state, the second on-board charger is awakened and is in a charging mode;

[0028] S6: The second on-board charger collects the voltage at the third CP sampling point. If it is within the second preset voltage range, the sixth switch and the seventh switch are controlled to be closed, and the AC power is converted into DC power through the second rectifier circuit to charge the battery of the power supply vehicle.

[0029] Preferably, in S3, when the voltage at the second CP sampling point is greater than the first preset voltage, it is in the pure discharge mode; when the voltage at the second CP sampling point is less than or equal to the first preset voltage, it is in the emergency charging mode.

[0030] In summary, due to the adoption of the above technical solution, compared with the prior art, the present invention has at least the following beneficial effects:

[0031] Based on the original rectifier circuit of the on-board charger, the present invention determines the inverter mode of the vehicle by setting a CP monitoring circuit and voltage judgment of the sampling point, thereby realizing vehicle-to-vehicle AC charging control, which can effectively solve the problems of incomplete popularization of charging piles in the market and weak emergency charging capacity.

[0032] And on the basis of canceling the original emergency charging gun control box, charging control is still performed, which saves costs and improves the degree of automation of vehicle-to-vehicle charging. Description of the drawings:

[0033] Figure 1 Schematic diagram of an inverter-based vehicle-to-vehicle AC charging control system according to exemplary embodiment 1 of the present invention.

[0034] Figure 2 Schematic diagram of an inverter-based vehicle-to-vehicle AC charging control system according to exemplary embodiment 2 of the present invention.

[0035] Figure 3 1 is a flow chart of a vehicle-to-vehicle AC charging control method based on inverter according to exemplary embodiment 3 of the present invention.

[0036] Figure 4 It is a schematic diagram of the structure of the connection device between the charging vehicle and the power supply vehicle (provided with a control box) in the prior art.

[0037] Figure 5 Schematic diagram of a connection structure (without a control box) between a charging vehicle and a power supply vehicle according to an exemplary embodiment of the present invention. DETAILED DESCRIPTION

[0038] The present invention is further described in detail below in conjunction with the examples and specific implementation methods. However, this should not be understood as the scope of the above subject matter of the present invention being limited to the following examples, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0039] In the description of the present invention, it is necessary to understand that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0040] Example 1

[0041] like Figure 1 As shown, the present invention provides an inverter-based vehicle-to-vehicle AC charging control system, including a power supply vehicle A and a charging vehicle B, both of which are equipped with a charger with an inverter function, and the power supply vehicle A is provided with a power supply interface, and the charging vehicle B is provided with a charging interface, and the power supply interface and the charging interface are connected through an emergency charging gun.

[0042] In the prior art, the power supply vehicle A and the charging vehicle B are generally connected via a charging connection device, such as Figure 4 As shown, a control box is provided in the charging connection device for charging control. The charging box makes the charging gun inconvenient to operate, has been damaged, is not lightweight, and is costly. Figure 5 As shown, in this application, only the emergency charging gun needs to be connected, and there is no need to set up a control box, thereby improving the efficiency of automated operation.

[0043] In this embodiment, the charger on the power supply vehicle A has three first L lines for transmitting current and one first neutral line N1, which are L1, L2, and L3 respectively. The power supply interface is connected to the charger on the power supply vehicle A through the first L line; a first switch K1 is provided on the first L1 line, and a second switch K2 is provided on the first N line. The first switch K1 and the second switch K2 are internal high-voltage relays.

[0044] The charger on the charging vehicle B also has three second L lines for transmitting current and one second neutral line N, which are L1, L2, and L3 respectively. The charging interface is connected to the charger on the charging vehicle B through the second L lines; a sixth switch K6 is provided on the second L1 line, and a seventh switch K7 is provided on the second N line. The sixth switch K6 and the seventh switch K7 are internal high-voltage relays.

[0045] The charger on the power supply vehicle A is also provided with a first PE line, a first CC signal line and a first CP signal line. One end of the first CC signal line is connected to one end of the first CC signal interface in the power supply interface, the other end of the first CC signal interface is connected to one end of the first PE line through the first resistor R1, the other end of the first PE line is grounded, and the other end of the first CC signal line is connected to the first CC sampling point 1, which is the CC signal acquisition module of the first on-board charger.

[0046] When the emergency charging gun has the charging and discharging functions, one end of the first CP signal line is connected to the first CP signal interface in the power supply interface, the other end of the first CP signal line is connected to one end of the third switch K3 (single-pole double-throw switch), and the other end of the third switch K3 is connected to the first CP detection circuit.

[0047] The specific connection relationship of the first CP detection circuit is:

[0048] The CPOUT terminal is respectively connected to one end of the second resistor R2 and the positive electrode of the second diode D2; the other end of the second resistor R2 is respectively connected to one end of the third resistor R3 and the collector of the first transistor Q1, the other end of the third resistor R3 is connected to the negative electrode of the first diode D1, the positive electrode of the first diode D1 is connected to the 12V voltage, the base of the first transistor Q1 is connected to the control end of the MCU (for sending a PWM signal), the emitter of the first transistor Q1 is connected to one end of the fourth resistor R4, and the other end of the fourth resistor R4 is connected to the -5V voltage; the negative electrode of the second diode D2 is connected to one end of the fifth resistor R5, the other end of the fifth resistor R5 is connected to one end of the sixth resistor R6, the other end of the sixth resistor R6 is grounded, and a second CP sampling point 2 is provided between the fifth resistor R5 and the sixth resistor R6 for collecting the voltage of the sixth resistor R6;

[0049] The CPIN end is respectively connected to one end of the seventh resistor R7 and one end of the ninth resistor R9, the other end of the seventh resistor R7 is connected to one end of the eighth resistor R8, the other end of the eighth resistor R8 is grounded, and the other end of the ninth resistor R9 is grounded through the fourth switch K4; a first CP sampling point 1 is set between the seventh resistor R7 and the eighth resistor R8, which is used for the voltage of the eighth resistor R8.

[0050] A second PE line, a second CC signal line, and a second CP signal line are also provided in the charger on the charging vehicle B. One end of the second CC signal line is connected to one end of the second CC signal interface in the charging interface, and the other end of the second CC signal interface is connected to one end of the eleventh resistor R11, and the other end of the eleventh resistor R11 is respectively connected to one end of the tenth resistor R10 and one end of the fifth switch K5, and the other end of the tenth resistor R10 and the other end of the fifth switch K5 are respectively connected to one end of the second PE line, and the other end of the second PE line is grounded; the other end of the second CC signal line is connected to the second CC sampling point 2, and the second CC sampling point 2 is a CC signal acquisition module.

[0051] One end of the second CP signal line is connected to the second CP signal interface in the charging interface, the other end of the second CP signal line is connected to one end of the eighth switch K8 (single-pole double-throw switch), and the other end of the eighth switch K8 is connected to the second CP detection circuit.

[0052] The specific connection relationship of the second CP detection circuit is:

[0053] The CPOUT terminal is respectively connected to one end of the seventeenth resistor R17 and the positive electrode of the third diode D3; the other end of the seventeenth resistor R17 is respectively connected to one end of the eighteenth resistor R18 and the collector of the second transistor Q2, the other end of the eighteenth resistor R18 is connected to the negative electrode of the fourth diode D4, the positive electrode of the fourth diode D4 is connected to the 12V voltage, the base of the second transistor Q2 is connected to the control end of the MCU (for sending a PWM signal), the emitter of the second transistor Q2 is connected to one end of the nineteenth resistor R19, and the other end of the nineteenth resistor R19 is connected to the -5V voltage; the negative electrode of the third diode D3 is connected to one end of the fifteenth resistor R15, the other end of the fifteenth resistor R15 is connected to one end of the sixteenth resistor R16, the other end of the sixteenth resistor R16 is grounded, and a fourth CP sampling point 4 is set between the fifteenth resistor R15 and the sixteenth resistor R16 for collecting the voltage of R16.

[0054] The CPIN end is respectively connected to one end of the twelfth resistor R12 and one end of the fourteenth resistor R14, the other end of the twelfth resistor R12 is connected to one end of the thirteenth resistor R13, the other end of the thirteenth resistor R13 is grounded, and the other end of the fourteenth resistor R14 is grounded through the ninth switch K9; a third CP sampling point 3 is set between the twelfth resistor R12 and the thirteenth resistor R13, for collecting the voltage of R13.

[0055] In this embodiment, the charger on the power supply vehicle A divides the charging state into multiple states by identifying the resistance value of the CC resistor (first resistor R1) in the power supply interface, and determines the charging current according to the state, see Table 1.

[0056] Table 1. Classification of CC resistance detection status

[0057]

[0058]

[0059] In Table 1: Not connected means that the power supply interface of the power supply vehicle A is not plugged into the emergency charging gun, and the charging interface of the charging vehicle B is also not plugged into the emergency charging gun; Fully connected means that the power supply interface of the power supply vehicle A is plugged into the emergency charging gun, the charging interface of the charging vehicle B is also plugged into the emergency charging gun, and the CC resistance is a valid value; Half-connected means that the power supply interface of the power supply vehicle A is plugged into the emergency charging gun, the charging interface of the charging vehicle B is plugged into the emergency charging gun, and the CC resistance is an invalid value.

[0060] In this embodiment, the power supply vehicle A clearly classifies the charging status by identifying the resistance value of the CC resistor (the first resistor R1). When the connection state is in the fully connected state, the charger of the power supply vehicle A is awakened and is in the inverter mode. At this time, the third switch K3 is connected to the CPOUT terminal of the first CP detection circuit, and the inverter mode is judged by identifying the voltage of the second CP sampling point 2, including pure discharge mode and emergency charging mode.

[0061] When the voltage at the second CP sampling point 2 is greater than the first preset voltage, it is in pure discharge mode, the third switch K3 is connected to the CPIN terminal of the first CP detection circuit, the fourth switch K4 is closed, and the on-board charger performs normal discharge according to the program;

[0062] When the voltage at the second CP sampling point 2 is less than or equal to the first preset voltage, it is in emergency charging mode, the third switch K3 is connected to the CPOUT terminal of the first CP detection circuit, and the on-board charger of the power supply vehicle A continues to send PWM signals (the charging vehicle starts and ends charging by detecting the state of the PWM signal, and adjusts the charging current by the duty cycle of the PWM wave signal); when the on-board charger of the charging vehicle B receives the CC and CP signals sent by the on-board charger of the power supply vehicle A, it indicates that the charging connection between the two vehicles is successful, and the on-board charger of the power supply vehicle A enters the emergency charging mode. When the charging vehicle is ready, S2 will be closed. After the CP sampling point 2 collects the 6V duty cycle, the first switch K1 and the second switch K2 are controlled to be closed, and the first rectifier circuit ( Figure 1 (not shown) converts the battery DC into 220V AC and outputs it to the charging vehicle through the emergency charging gun. The charging current is the rated current corresponding to the different state classifications. For example, when the state classification is B, the rated current of the charging current is 10A, when the state classification is C, the rated current of the charging current is 16A, and when the state classification is D, the rated current of the charging current is 32A.

[0063] The on-board charger of charging vehicle B determines the charging state by identifying the resistance value of the CC resistor (the tenth resistor R10 + the eleventh resistor R11) of the charging interface (the same as the CC resistor judgment in the power supply vehicle). When the connection state is in the full connection state, the charger of power supply vehicle B is awakened and is in charging mode. At this time, the eighth switch K8 is connected to the CPIN end of the second CP detection circuit. If the third CP acquisition point acquires 9VPWM, the ninth switch K9 is closed. At this time, the voltage at the CP acquisition point will change from 9VPWM to 6VPWM; then the charging current is judged (the rated current of the charging current is 10A when the state classification is B, the rated current of the charging current is 16A when the state classification is C, and the rated current of the charging current is 32A when the state classification is D). The charger of power supply vehicle B controls the sixth switch K6 and the seventh switch K7 to be closed, and the second rectifier circuit ( Figure 1 (not shown) converts 220V AC into DC to charge the battery of power supply vehicle B.

[0064] Example 2

[0065] like Figure 2 As shown, the present invention provides an inverter-based vehicle-to-vehicle AC charging control system, including a power supply vehicle A and a charging vehicle B, the power supply vehicle A is equipped with a charger with an inverter function, the charging vehicle B is equipped with a charger without an inverter function, and the power supply vehicle A is provided with a power supply interface, and the charging vehicle B is provided with a charging interface, and the power supply interface and the charging interface are connected through an emergency charging gun.

[0066] One end of the second CP signal line on the charging vehicle B is connected to the second CP signal interface in the charging interface, and the other end of the second CP signal line is respectively connected to one end of the twelfth resistor R12 and one end of the fourteenth resistor R14, the other end of the twelfth resistor R12 is grounded, and the other end of the fourteenth resistor R14 is grounded through the ninth switch K9 (single-pole single-throw switch). A third CP sampling point 3 is set between the second CP signal interface and the twelfth resistor R12 and the fourteenth resistor R14, which is used to collect the voltage of R14.

[0067] The on-board charger of charging vehicle B determines the charging state by identifying the resistance value of the CC resistor (the tenth resistor R11+the eleventh resistor R11) of the charging interface (the same as the CC resistor judgment in the power supply vehicle). When the connection state is in the full connection state, the charger of power supply vehicle B is awakened and is in charging mode, and the voltage of the third CP sampling point 3 is collected; if the third CP collection point collects 9VPWM, the ninth switch K9 is closed, and the voltage of the CP collection point will change from 9VPWM to 6VPWM; then the charging current is judged (the rated current of the charging current is 10A when the state classification is B, the rated current of the charging current is 16A when the state classification is C, and the rated current of the charging current is 32A when the state classification is D), and the charger of power supply vehicle B controls the sixth switch K6 and the seventh switch K7 to be closed, and through the second rectifier circuit ( Figure 1 (not shown) converts 220V AC into DC to charge the battery of power supply vehicle B.

[0068] Based on the original rectifier circuit of the on-board charger, the present invention appropriately adjusts the software and hardware to realize the car-to-car charging control of the AC charging port (with inverter function), which can effectively solve the problem that charging piles are not fully popularized in the market and the emergency charging capacity is weak. And by adjusting the internal software and hardware of the charger, charging control can be realized, and the original emergency charging gun control box can be cancelled, saving costs.

[0069] Example 3

[0070] like Figure 3 As shown, the present invention also provides a vehicle-to-vehicle AC charging control method based on inverter, which specifically includes the following steps:

[0071] S1: Connect the first onboard charger of the power supply vehicle and the second onboard charger of the charging vehicle through the emergency charging gun. The first onboard charger is awakened by the CC signal and continuously sends the CP signal to the second onboard charger. The second onboard charger continuously detects the CC signal and the CP signal. The CC signal is used for connection confirmation, and the CP signal is used for control confirmation.

[0072] S2: The first on-board charger identifies the resistance value of the first CC resistor in the power supply interface, and determines the corresponding state classification and connection state, see Table 2. If the connection state is fully connected, enter S3, if the connection state is half connected or not connected, repeat S2.

[0073] Table 2. Status classification corresponding to the first CC resistance value

[0074]

[0075] For example, when the resistance of the first CC resistor is 1.5KΩ, the state classification is B, the connection state is fully connected, and the rated current of the charging current is 10A; when the resistance of the first CC resistor is 680Ω, the state classification is C, the connection state is fully connected, and the rated current of the charging current is 16A; when the resistance of the first CC resistor is 220Ω, the state classification is D, the connection state is fully connected, and the rated current of the charging current is 32A.

[0076] S3: The first on-board charger is in the inverter mode. The inverter mode is judged by identifying the voltage of the second CP sampling point. The inverter mode includes a pure discharge mode and an emergency charging mode. If it is the pure discharge mode, discharge is performed; if it is the emergency charging mode, enter S4.

[0077] In this embodiment, when the voltage at the second CP sampling point 2 is greater than the first preset voltage, it is a pure discharge mode; when the voltage at the second CP sampling point 2 is less than or equal to the first preset voltage, it is an emergency charging mode.

[0078] S4: The first on-board charger continuously sends a PWM signal. When the CC signal confirms that the connection is successful and the ninth switch K9 is closed, the first on-board charger controls the first switch K1 and the second switch K2 to close. The first rectifier circuit converts the DC output of the battery of the power supply vehicle into 220V AC, and outputs it to the charging interface of the charging vehicle through the emergency charging gun.

[0079] S5: The second on-board charger on the charging vehicle B identifies the resistance value of the second CC resistor in the charging interface, determines the corresponding state classification and connection state, and when the connection state is in a fully connected state, the second on-board charger of the power supply vehicle B is awakened and is in charging mode.

[0080] S6: The second on-board charger collects the voltage of the third CP sampling point 3. If the third CP collection point collects 9VPWM, the ninth switch K9 is closed. At this time, the voltage at the CP collection point will change from 9VPWM to 6VPWM; then the charging current is judged (the rated current of the charging current is 10A when the state classification is B, the rated current of the charging current is 16A when the state classification is C, and the rated current of the charging current is 32A when the state classification is D); the second on-board charger controls the sixth switch K6 and the seventh switch K7 to close, and converts the 220V AC into DC through the second rectifier circuit to charge the battery of the power supply vehicle B.

[0081] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present invention, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A vehicle-to-vehicle AC charging control system based on inverter, characterized in that: It includes a power supply vehicle and a charging vehicle. The power supply vehicle is equipped with a first on-board charger with an inverter function, and the charging vehicle is equipped with a second on-board charger. The first on-board charger is provided with a power supply interface, and the second on-board charger is provided with a charging interface. The power supply interface and the charging interface are connected through an emergency charging gun.

2. The inverter-based vehicle-to-vehicle AC charging control system according to claim 1, characterized in that: The second on-board charger may or may not have an inverter function.

3. The inverter-based vehicle-to-vehicle AC charging control system according to claim 1, characterized in that: The first on-board charger is provided with a first PE line, a first CC signal line and a first CP signal line; One end of the first CC signal line is connected to one end of the first CC signal interface in the power supply interface, the other end of the first CC signal interface is connected to one end of the first PE line through the first resistor, the other end of the first PE line is grounded, and the other end of the first CC signal line is connected to the first CC sampling point.

4. The inverter-based vehicle-to-vehicle AC charging control system according to claim 3, characterized in that: One end of the first CP signal line is connected to the first CP signal interface in the power supply interface, the other end of the first CP signal line is connected to one end of the third switch, and the other end of the third switch is connected to the first CP detection circuit.

5. The inverter-based vehicle-to-vehicle AC charging control system according to claim 4, characterized in that: The specific connection relationship of the first CP detection circuit is: The CPOUT terminal is respectively connected to one end of the second resistor and the positive electrode of the second diode; the other end of the second resistor is respectively connected to one end of the third resistor and the collector of the first transistor, the other end of the third resistor is connected to the negative electrode of the first diode, the positive electrode of the first diode is connected to the 12V voltage, the base of the first transistor is connected to the control end of the MCU of the first on-board charger, the emitter of the first transistor is connected to one end of the fourth resistor, and the other end of the fourth resistor is connected to the -5V voltage; the negative electrode of the second diode is connected to one end of the fifth resistor, the other end of the fifth resistor is connected to one end of the sixth resistor, the other end of the sixth resistor is grounded, and a second CP sampling point is set between the fifth resistor and the sixth resistor; The CPIN terminal is respectively connected to one end of the seventh resistor and one end of the ninth resistor, the other end of the seventh resistor is connected to one end of the eighth resistor, the other end of the eighth resistor is grounded, and the other end of the ninth resistor is grounded through the fourth switch; A first CP sampling point is arranged between the seventh resistor and the eighth resistor.

6. The inverter-based vehicle-to-vehicle AC charging control system according to claim 1, characterized in that: The second on-board charger is provided with a second PE line, a second CC signal line and a second CP signal line; One end of the second CC signal line is connected to one end of the second CC signal interface in the charging interface, the other end of the second CC signal interface is connected to one end of the eleventh resistor, the other end of the eleventh resistor is respectively connected to one end of the tenth resistor and one end of the fifth switch, the other end of the tenth resistor and the other end of the fifth switch are respectively connected to one end of the second PE line, and the other end of the second PE line is grounded; the other end of the second CC signal line is connected to the second CC sampling point.

7. The inverter-based vehicle-to-vehicle AC charging control system according to claim 6, characterized in that: One end of the second CP signal line is connected to the second CP signal interface in the charging interface, the other end of the second CP signal line is connected to one end of the eighth switch, and the other end of the eighth switch is connected to the second CP detection circuit.

8. The inverter-based vehicle-to-vehicle AC charging control system according to claim 7, characterized in that: The specific connection relationship of the second CP detection circuit is: The CPOUT terminal is respectively connected to one end of the seventeenth resistor and the positive electrode of the third diode; the other end of the seventeenth resistor is respectively connected to one end of the eighteenth resistor and the collector of the second transistor, the other end of the eighteenth resistor is connected to the negative electrode of the fourth diode, the positive electrode of the fourth diode is connected to the 12V voltage, the base of the second transistor is connected to the control end of the MCU of the second on-board charger, the emitter of the second transistor is connected to one end of the nineteenth resistor, and the other end of the nineteenth resistor is connected to the -5V voltage; the negative electrode of the third diode is connected to one end of the fifteenth resistor, the other end of the fifteenth resistor is connected to one end of the sixteenth resistor, the other end of the sixteenth resistor is grounded, and a fourth CP sampling point is set between the fifteenth resistor and the sixteenth resistor; The CPIN end is respectively connected to one end of the twelfth resistor and one end of the fourteenth resistor, the other end of the twelfth resistor is connected to one end of the thirteenth resistor, the other end of the thirteenth resistor is grounded, and the other end of the fourteenth resistor is grounded through the ninth switch; a third CP sampling point is set between the twelfth resistor and the thirteenth resistor; or: One end of the second CP signal line is connected to the second CP signal interface in the charging interface, and the other end of the second CP signal line is respectively connected to one end of the twelfth resistor and one end of the fourteenth resistor, the other end of the twelfth resistor is grounded, and the other end of the fourteenth resistor is grounded through the ninth switch; a third CP sampling point is set between the second CP signal interface and the twelfth resistor and the fourteenth resistor.

9. A method for controlling vehicle-to-vehicle AC charging based on an inverter based on the system according to any one of claims 1 to 8, characterized in that: The specific steps include: S1: Connect the first onboard charger of the power supply vehicle and the second onboard charger of the charging vehicle through an emergency charging gun. After being awakened by the CC signal, the first onboard charger continuously sends the CP signal to the second onboard charger; the second onboard charger continuously detects the CC signal and the CP signal; S2: The first on-board charger identifies the resistance value of the first CC resistor in the power supply interface, and determines the corresponding state classification and connection state; if the connection state is fully connected, enter S3; if the connection state is half-connected or not connected, repeat S2; S3: The first on-board charger is in the inverter mode, and the inverter mode is judged by identifying the voltage of the second CP sampling point; if it is in the pure discharge mode, it is directly discharged; if it is in the emergency charging mode, it enters S4; S4: The first on-board charger continuously sends a PWM signal. When the CC signal confirms that the connection is successful, the first switch and the second switch are controlled to close. The first rectifier circuit converts the DC output of the battery of the power supply vehicle into AC power, and outputs it to the charging interface of the charging vehicle through the emergency charging gun. S5: The second on-board charger on the charging vehicle identifies the resistance value of the second CC resistor in the charging interface, and determines the corresponding state classification and connection state; when the connection state is in a fully connected state, the second on-board charger is awakened and is in a charging mode; S6: The second on-board charger collects the voltage at the third CP sampling point. If it is within the second preset voltage range, the sixth switch and the seventh switch are controlled to be closed, and the AC power is converted into DC power through the second rectifier circuit to charge the battery of the power supply vehicle.

10. The inverter-based vehicle-to-vehicle AC charging control method according to claim 9, characterized in that: In S3, when the voltage at the second CP sampling point is greater than the first preset voltage, it is in the pure discharge mode; when the voltage at the second CP sampling point is less than or equal to the first preset voltage, it is in the emergency charging mode.

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