Control method and device of alternating current charging and discharging pile and alternating current charging and discharging pile

Abstract

The invention provides a control method and device of an alternating current charging and discharging pile and the alternating current charging and discharging pile. The alternating current charging and discharging pile comprises a PP terminal and a PE terminal, the PP terminal is connected with the PE terminal through a first resistor and a second resistor, the first resistor and the second resistor are connected in parallel, the resistance values of the first resistor and the second resistor are different, and the method comprises the steps that when the alternating current charging and discharging pile needs to be switched to be in a charging mode or a discharging mode, the PP terminal and the PE terminal are controlled to be disconnected; and after a preset duration, the PP terminal and the PE terminal are controlled to switch the alternating current charging and discharging pile to be in a charging mode through conduction of the first resistor, or the PP terminal and the PE terminal are controlled to switch the alternating current charging and discharging pile to be in a discharging mode through conduction of the second resistor. Discharging or charging of the vehicle can be achieved at the same time through the alternating current charging and discharging pile, a user does not need to pull out a gun when charging and discharging switching is conducted on the vehicle, and the convenience that the user uses the alternating current charging and discharging pile to conduct charging and discharging on the vehicle is improved.

Description

Technical Field

[0001] This application relates to the field of power electronics, and more specifically, to a control method, device, and AC charging / discharging pile for AC charging / discharging. Background Technology

[0002] Currently, the function of discharging power to loads has become almost a standard feature of electric vehicles. For household users, the desire to use the on-board battery of electric vehicles for charging and discharging, and to integrate electric vehicles into the home energy management system as a backup energy source is becoming increasingly strong.

[0003] Currently, most AC or DC charging stations on the market only offer charging functionality. For electric vehicles to discharge, a discharge gun specific to the vehicle model is required. Users cannot conveniently use a single device to both discharge and charge their electric vehicles. Summary of the Invention

[0004] This application provides a control method, device, and AC charging / discharging pile for AC charging and discharging. The following describes the various aspects involved in this application.

[0005] In a first aspect, a control method for an AC charging / discharging pile is provided. The AC charging / discharging pile includes a proximity guide PP terminal and a grounding PE terminal. The PP terminal is connected to the PE terminal through a first resistor and a second resistor. The first resistor and the second resistor are connected in parallel and have different resistance values. The PP terminal and the PE terminal are not simultaneously connected through the first resistor and the second resistor. The method includes: when it is necessary to switch the AC charging / discharging pile to a charging mode or a discharging mode, controlling the connection between the PP terminal and the PE terminal to be disconnected; after a preset time, controlling the PP terminal and the PE terminal to be connected through the first resistor to switch the AC charging / discharging pile to a charging mode, or controlling the PP terminal and the PE terminal to be connected through the second resistor to switch the AC charging / discharging pile to a discharging mode.

[0006] In one possible implementation, the AC charging / discharging station also includes a control guide CP terminal, which is connected to a control guide circuit. When it is necessary to switch the AC charging / discharging station to the discharging mode, the method further includes: disconnecting the connection between the control CP terminal and the control guide circuit; when it is necessary to switch the AC charging / discharging station to the charging mode, the method further includes: after a preset time, connecting the connection between the control CP terminal and the control guide circuit.

[0007] In one possible implementation, the second resistor is a variable resistor. Before switching the AC charging / discharging pile to discharge mode by controlling the PP terminal and PE terminal to conduct through the second resistor, the method further includes: controlling the resistance value of the second resistor to be a target resistance value, which is a pre-acquired resistance value required for the discharge of the vehicle connected to the AC charging / discharging pile.

[0008] In one possible implementation, the CP terminal is also connected to the PP terminal. When switching the AC charging / discharging pile to charging mode, the method further includes: controlling the connection between the CP terminal and the PP terminal to disconnect. When switching the AC charging / discharging pile to discharging mode, the method further includes: controlling the connection between the CP terminal and the PP terminal to be turned on or off according to the discharge demand of the vehicle connected to the AC charging / discharging pile.

[0009] In one possible implementation, the PP terminal is connected to a first resistor and a first switch via a switching switch, the first switch is connected to a second resistor, and the first and second resistors are connected to the PE terminal. Controlling the disconnection between the PP terminal and the PE terminal includes: controlling the switching switch to connect with the first switch, and controlling the first switch to disconnect, thus disconnecting the connection between the PP terminal and the PE terminal. Controlling the PP terminal and the PE terminal to switch the AC charging / discharging pile to charging mode via the first resistor includes: controlling the switching switch to connect with the first resistor, thus connecting the PP terminal and the PE terminal via the first resistor, thereby switching the AC charging / discharging pile to charging mode. Controlling the PP terminal and the PE terminal to switch the AC charging / discharging pile to discharging mode via the second resistor includes: controlling the switching switch to connect with the first switch, and controlling the first switch to turn on, thus connecting the PP terminal and the PE terminal via the second resistor, thereby switching the AC charging / discharging pile to discharging mode.

[0010] In one possible implementation, the AC charging / discharging station further includes a live wire terminal and a neutral wire terminal, which are respectively connected to the power grid and to the load. After controlling the PP terminal and PE terminal to switch the AC charging / discharging station to discharge mode through the second resistor, the method further includes: when the vehicle connected to the AC charging / discharging station starts discharging, controlling the connection between the live wire terminal and the neutral wire terminal and the power grid to disconnect; and controlling the connection between the live wire terminal and the neutral wire terminal and the load to connect.

[0011] In one possible implementation, after controlling the live wire terminal and the neutral wire terminal to be connected to the load, the method further includes: acquiring the output power of the AC charging / discharging pile to the load; determining whether it is necessary to stop the vehicle's discharge based on the output power and the vehicle's maximum output power; when it is determined that the vehicle's discharge needs to be stopped, controlling the connection between the live wire terminal and the neutral wire terminal and the load to be disconnected; and controlling the AC charging / discharging pile to switch to charging mode.

[0012] In one possible implementation, determining whether to stop the vehicle's discharge based on the output power and the vehicle's maximum output power includes: determining that the vehicle's discharge needs to be stopped when the output power is greater than or equal to the product of the vehicle's maximum output power and a first proportional threshold, less than or equal to the product of the vehicle's maximum output power and a second proportional threshold, and the duration is greater than or equal to a preset time; and / or, determining that the vehicle's discharge needs to be stopped when the output power is greater than or equal to the product of the vehicle's maximum output power and a third proportional threshold; wherein the first proportional threshold is less than the second proportional threshold, and the second proportional threshold is less than the third proportional threshold.

[0013] In one possible implementation, the AC charging / discharging station further includes a live wire terminal and a neutral wire terminal, which are respectively connected to the power grid and to the load. After controlling the PP terminal and PE terminal to switch the AC charging / discharging station to charging mode through the first resistor, the method further includes: controlling the connection between the live wire terminal and the neutral wire terminal and the load to disconnect; and controlling the connection between the live wire terminal and the neutral wire terminal and the power grid to connect when the power grid is energized.

[0014] Secondly, a control device for an AC charging / discharging pile is provided. The AC charging / discharging pile includes a proximity guide PP terminal and a grounding PE terminal. The PP terminal is connected to the PE terminal through a first resistor and a second resistor. The first resistor and the second resistor are connected in parallel and have different resistance values. The PP terminal and the PE terminal are not simultaneously connected through the first resistor and the second resistor. The device includes: a control module, used to control the connection between the PP terminal and the PE terminal to disconnect when it is necessary to switch the AC charging / discharging pile to charging mode or discharging mode; after a preset time, controlling the PP terminal and the PE terminal to conduct through the first resistor to switch the AC charging / discharging pile to charging mode, or controlling the PP terminal and the PE terminal to conduct through the second resistor to switch the AC charging / discharging pile to discharging mode.

[0015] In one possible implementation, the AC charging and discharging station further includes a control guide CP terminal, which is connected to a control guide circuit. The control module is also used to control the disconnection of the connection between the CP terminal and the control guide circuit. When it is necessary to switch the AC charging and discharging station to charging mode, the method further includes: after a preset time, the connection between the control CP terminal and the control guide circuit is turned on.

[0016] In one possible implementation, the second resistor is a variable resistor, and the control module is also used to control the resistance value of the second resistor to be a target resistance value, which is the resistance value required for the vehicle connected to the AC charging and discharging pile to discharge, obtained in advance.

[0017] In one possible implementation, the CP terminal is also connected to the PP terminal, and the control module is also used to control the disconnection of the connection between the CP terminal and the PP terminal; when switching the AC charging and discharging pile to the discharge mode, the method further includes: controlling the connection between the CP terminal and the PP terminal to be turned on or off according to the discharge demand of the vehicle connected to the AC charging and discharging pile.

[0018] In one possible implementation, the PP terminal is connected to a first resistor and a first switch via a switching switch, the first switch is connected to a second resistor, and the first and second resistors are connected to the PE terminal. The control module is specifically used to control the switching switch to connect with the first switch and to control the first switch to disconnect, thereby breaking the connection between the PP terminal and the PE terminal; to control the switching switch to connect with the first resistor, enabling the PP terminal and the PE terminal to conduct through the first resistor, thus switching the AC charging / discharging pile to charging mode; and to control the switching switch to connect with the first switch and to control the first switch to conduct, enabling the PP terminal and the PE terminal to conduct through the second resistor, thus switching the AC charging / discharging pile to discharging mode.

[0019] In one possible implementation, the AC charging and discharging station also includes a live wire terminal and a neutral wire terminal, which are respectively connected to the power grid and to the load. The control module is also used to control the connection between the live wire terminal and the neutral wire terminal and the power grid to disconnect when the vehicle connected to the AC charging and discharging station starts discharging; and to control the connection between the live wire terminal and the neutral wire terminal and the load to be turned on.

[0020] In one possible implementation, the device further includes an acquisition module for acquiring the output power of the AC charging / discharging pile to the load; a control module for determining whether it is necessary to stop the vehicle's discharge based on the output power and the vehicle's maximum output power; when it is determined that the vehicle's discharge needs to be stopped, controlling the connection between the live wire terminal and the neutral wire terminal and the load to be disconnected; and controlling the AC charging / discharging pile to switch to charging mode.

[0021] In one possible implementation, the control module is specifically configured to determine that the vehicle's discharge needs to be stopped when the output power is greater than or equal to the product of the vehicle's maximum output power and a first proportional threshold, less than or equal to the product of the vehicle's maximum output power and a second proportional threshold, and the duration is greater than or equal to a preset time; and / or, determine that the vehicle's discharge needs to be stopped when the output power is greater than or equal to the product of the vehicle's maximum output power and a third proportional threshold; wherein the first proportional threshold is less than the second proportional threshold, and the second proportional threshold is less than the third proportional threshold.

[0022] In one possible implementation, the AC charging and discharging station also includes a live wire terminal and a neutral wire terminal, which are respectively connected to the power grid and to the load. The control module is also used to control the connection between the live wire terminal and the neutral wire terminal and the load to disconnect; and to control the connection between the live wire terminal and the neutral wire terminal and the power grid to be turned on when the power grid is energized.

[0023] Thirdly, an AC charging / discharging pile is provided, comprising: a proximity guide PP terminal and a grounding PE terminal, wherein the PP terminal is connected to the PE terminal through a first resistor and a second resistor, the first resistor and the second resistor are connected in parallel, the resistance values ​​of the first resistor and the second resistor are different, and the PP terminal and the PE terminal are not simultaneously connected through the first resistor and the second resistor, and further comprising a controller for performing the method as described in the first aspect or any possible implementation thereof.

[0024] In one possible implementation, the PP terminal is connected to a first resistor and a first switch via a switching switch, the first switch is connected to a second resistor, and the first resistor and the second resistor are connected to the PE terminal.

[0025] Fourthly, a computer-readable storage medium having program code stored thereon, the program code being used by a controller of an AC charging / discharging pile to perform the method as described in the first aspect or any possible implementation thereof.

[0026] In this embodiment, the proximity guide terminal and grounding terminal of the AC charging / discharging pile are connected in parallel via a first resistor and a second resistor with different resistance values. This allows the AC charging / discharging pile to switch its charging and discharging modes by changing the connection between the proximity guide terminal and the grounding terminal via the first resistor or via the second resistor. This enables vehicles to be charged or discharged through the AC charging / discharging pile, improving the convenience for users. Furthermore, before switching charging or discharging modes, the connection between the proximity guide terminal and the grounding terminal can be disconnected to make the resistance between them infinitely high, simulating a disconnected state between the charging / discharging pile's charging gun and the vehicle. This allows the vehicle to better recognize the subsequent charging or discharging mode switch and correctly initiate charging or discharging. Therefore, users do not need to unplug the charging gun when switching between charging and discharging modes, further improving the convenience of using the AC charging / discharging pile. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of the AC charging and discharging pile provided in the embodiments of this application;

[0029] Figure 2 This is a schematic diagram of the structure of the AC charging and discharging system provided in the embodiments of this application;

[0030] Figure 3 This is a flowchart illustrating the control method for the AC charging and discharging pile provided in an embodiment of this application;

[0031] Figure 4 This is a schematic diagram of the control device for the AC charging and discharging pile provided in the embodiments of this application. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0033] Currently, the function of discharging power to loads has become almost a standard feature of electric vehicles. For household users, the desire to use the on-board battery of electric vehicles for charging and discharging, and to integrate electric vehicles into the home energy management system as a backup energy source is becoming increasingly strong.

[0034] Currently, most AC or DC charging stations on the market only offer charging functionality. For electric vehicles to discharge, a discharge gun specific to the vehicle model is required. Users cannot conveniently use a single device to both discharge and charge their electric vehicles.

[0035] Therefore, to address the aforementioned problems, this application provides a control method for an AC charging / discharging pile. In this embodiment, the AC charging / discharging pile can switch its charging and discharging modes by switching the proximity guide terminal and the ground terminal connected via a first resistor or a second resistor, thereby enabling vehicles to charge or discharge through the AC charging / discharging pile and improving the convenience for users. Furthermore, before switching the charging or discharging mode, the connection between the proximity guide terminal and the ground terminal can be disconnected to make the resistance between them infinitely high, simulating a disconnected state between the charging / discharging pile's charging gun and the vehicle. This allows the vehicle to better identify the subsequent charging or discharging mode switched by the AC charging / discharging pile, enabling the vehicle to correctly start discharging or charging. This eliminates the need for the user to unplug the charging gun when switching between charging and discharging, further improving the convenience for users to charge and discharge their vehicles using the AC charging / discharging pile.

[0036] In this application, the control method for the AC charging and discharging pile described above can be applied to corresponding AC charging and discharging piles. For example, such as... Figure 1 As shown in the illustration, this application provides an AC charging / discharging station. The AC charging / discharging station includes a proximity pilot (PP) terminal and a protective earth (PE) terminal. The PP terminal can be connected to the PE terminal via a first resistor (e.g., R1) and a second resistor (e.g., R2). The first and second resistors are connected in parallel with different resistance values ​​(e.g., the first resistor is 200 ohms, and the second resistor is 2000 ohms, etc., the specific resistance values ​​can be set according to the vehicle's charging / discharging requirements). The PP terminal and the PE terminal are not simultaneously connected through the first and second resistors. This allows switching the charging and discharging modes of the AC charging / discharging station by switching the connection between the PP terminal and the PE terminal via the first resistor or via the second resistor. For example, the second resistor can be a variable resistor, for instance, its resistance value can be set using a digital potentiometer to adjust the resistance value according to the required grounding resistance of the PP terminal during vehicle discharge. Of course, in some other possible implementations, the second resistor can also be a fixed resistor, which is not limited here.

[0037] In some possible implementations, to switch the connection between the PP and PE terminals via a first resistor or a second resistor, a switch can be used to connect the first and second resistors to the PP terminals respectively, depending on control requirements. For example, the first resistor can be connected to the PP terminal via pin 1 of switch K3, and the second resistor can be connected to the PP terminal via pin 2 of switch K3. A first switch (e.g., switch K4 between pin 2 of switch K3 and the second resistor) can be provided between switch K3 and switch K4 to disconnect the connection between the PP and PE terminals. Of course, in practical applications, other methods can also be used to switch the connection between the PP and PE terminals via a first resistor or a second resistor, and to disconnect the connection between the PP and PE terminals; this is not limited here.

[0038] For example, the AC charging and discharging pile provided in this application embodiment may further include a control pilot (CP) terminal. The CP terminal can be connected to a control pilot circuit to realize control communication between the AC charging and discharging pile and the vehicle during vehicle charging. According to control requirements, the CP terminal can be connected to the control pilot circuit through a corresponding switch (such as switch K1) so that the connection between the CP terminal and the control pilot circuit can be opened and closed by the switch K1.

[0039] In some possible implementations, the CP terminal and the PP terminal can also be connected by a switch (such as switch K2) so that the connection between the CP terminal and the PP terminal can be opened and closed by controlling switch K2.

[0040] In this embodiment of the application, the AC charging and discharging pile may also include a controller (such as a central processing unit (CPU) or other processing chip), which can execute the control method provided in this embodiment of the application.

[0041] For example, the AC charging and discharging station can also be equipped with a network module (such as a Wireless Fidelity (WiFi) module) connected to the controller. This network module enables the controller to connect to the network, allowing it to receive network control commands, charging and discharging parameters, and other information. For instance, the network connection can be used to enable mobile terminal applications to operate and control the AC charging and discharging station.

[0042] In practical applications, in order to connect to the vehicle's AC port to transmit electrical energy for vehicle discharge or charging, AC charging / discharging stations may also include a live (L) terminal and a neutral (N) terminal. The L and N terminals can be connected to the load and the power grid, respectively, to charge the vehicle via the grid or supply power to the load by discharging from the vehicle. For example, as... Figure 2 As shown, when the AC charging and discharging pile, the power grid, and the load form an AC charging and discharging system, the AC charging and discharging pile can be equipped with an AC output terminal (AC (Alternating Current) terminal) so that the L terminal and N terminal can be connected to the power grid and the load through the AC terminal.

[0043] An AC contactor K5 can be installed between the power grid and the load to control the connection between them, as well as the connection between the power grid and the AC charging / discharging station (i.e., between the power grid and the L and N terminals). The L, N, CP, PP, and PE terminals of the AC charging / discharging station can be connected to the corresponding terminals of the electric vehicle via wires, allowing the electric vehicle to discharge and charge through the AC charging / discharging station.

[0044] It should be noted that the auxiliary power supply for AC charging and discharging stations can be provided by the power grid, while a backup power source can be used when the power grid fails. This backup power source can be the vehicle's cigarette lighter socket or another power source.

[0045] Of course, the above is only an exemplary description of the components included in the AC charging and discharging pile. In the embodiments of this application, the AC charging and discharging pile may also include other necessary components involved in the related technologies, which will not be elaborated here.

[0046] The control method for the AC charging and discharging pile provided in this application will be described below with reference to the accompanying drawings.

[0047] like Figure 3 As shown in the embodiments of this application, a control method for an AC charging and discharging pile may include the following S301-S302.

[0048] S301. When it is necessary to switch the AC charging / discharging pile to charging mode or discharging mode, the connection between the PP terminal and the PE terminal shall be disconnected.

[0049] The AC charging / discharging station can be set to a default charging standby state, meaning it can be configured to charge mode while in standby. Therefore, when a user needs to connect the AC charging / discharging station to their vehicle for discharging, they can switch the station to discharging mode. Alternatively, if the user is charging the vehicle using the AC charging / discharging station and needs to switch to discharging through the vehicle, they can switch the station to discharging mode. Or, if the user is discharging through the vehicle and needs to switch to charging the vehicle, they can switch the station to charging mode.

[0050] Therefore, whether an AC charging / discharging station needs to switch to charging or discharging mode can be controlled by the user according to their needs.

[0051] For example, users can control whether an AC charging / discharging station needs to switch to the corresponding mode using an application on a mobile device (such as a smartphone or tablet). For instance, when a user needs to discharge their vehicle, they can use the application on their mobile device to control the AC charging / discharging station to switch to discharging mode. Similarly, when a user needs to charge their vehicle using an AC charging / discharging station, they can use the application on their mobile device to control the AC charging / discharging station to switch to charging mode.

[0052] Accordingly, when the controller of the AC charging and discharging pile receives an instruction from the application to switch to charging mode or discharging mode, it can determine whether the AC charging and discharging pile needs to be switched to charging mode or discharging mode, and thus execute S301.

[0053] Of course, the above is merely an exemplary description of one implementation method for controlling the switching of AC charging and discharging piles to corresponding modes (such as charging mode or discharging mode). In practical applications, other methods can also be used to control the switching of AC charging and discharging piles to corresponding modes, and this is not a limitation. For example, a control panel can also be installed on the AC charging and discharging pile so that users can control the switching of AC charging and discharging piles to corresponding modes through the control panel.

[0054] When switching between charging and discharging modes on an AC charging / discharging station, the connection between the PP and PE terminals of the station can be disconnected, resulting in infinite resistance between them. This causes the vehicle to detect the infinite resistance between the PP and PE terminals, confirming that the vehicle is disconnected from the AC charging / discharging station and is in an unplugged state. Consequently, when the AC charging / discharging station is subsequently switched to charging or discharging mode, the vehicle can better recognize the mode change and avoid charging / discharging failures due to the inability to recognize the mode switch.

[0055] In practical applications, a switch can be installed between the PP and PE terminals to control the connection between them. Of course, other circuit structures can also be used to control the connection between the PP and PE terminals; this is not a limitation here.

[0056] For example, with Figure 1 Taking the AC charging / discharging pile shown as an example, the connection between the PP and PE terminals can be broken by controlling switch K4 to be off and switch K3 to be connected to pin 2 (i.e., connected to switch K4). Specifically, when switch K3 in the AC charging / discharging pile is connected to pin 1 and is in charging mode, to switch the AC charging / discharging pile to discharging mode, the connection between the PP and PE terminals can be broken by controlling switch K4 to be off and switch K3 to be connected to pin 2. Alternatively, when switch K3 in the AC charging / discharging pile is connected to pin 2 and switch K4 is on and in discharging mode, to switch the AC charging / discharging pile to charging mode, the connection between the PP and PE terminals can be broken by controlling switch K4 to be off.

[0057] In some possible implementations, when it is necessary to switch the AC charging / discharging station to charging mode or discharging mode, the connection between the CP terminal in the AC charging / discharging station and the control guide circuit can be controlled to better simulate the state of not plugging in the gun, so that the vehicle can better recognize the subsequent switching of the AC charging / discharging station's charging / discharging mode.

[0058] For example, when switching the AC charging / discharging station to discharge mode, the connection between the CP terminal and the control guide circuit can be disconnected to break the control signal between the AC charging / discharging station and the vehicle. This allows the vehicle to confirm the disconnection by detecting the control signal break, indicating it is in an unplugged state. This allows the vehicle to better recognize the station after subsequent charging / discharging mode switching. Correspondingly, since the connection between the CP terminal and the control guide circuit can remain disconnected when the AC charging / discharging station is in discharge mode, when switching to charging mode, the connection between the PP terminal and the PE terminal can be disconnected to simulate an unplugged state for a preset time, and then, according to the charging mode requirements, the connection between the CP terminal and the control guide circuit can be reconnected.

[0059] For example, continuing with Figure 1Taking the AC charging / discharging pile as an example, the connection between the CP terminal and the control guide circuit can be controlled by turning switch K1 on and off. Based on this, and combining with the previous example, when the switch K3 in the AC charging / discharging pile is connected to pin 1, switch K1 is on, and the pile is in charging mode. When it is necessary to switch the AC charging / discharging pile to discharging mode, the connection between the PP terminal and the PE terminal, as well as the connection between the CP terminal and the control guide circuit, can be disconnected by turning off switch K1, turning off switch K4, and connecting switch K3 to pin 2, thus simulating a state where the charging gun is not inserted. Alternatively, when the switch K3 in the AC charging / discharging pile is connected to pin 2, switch K4 is on, and switch K1 is off, the pile is in discharging mode. When it is necessary to switch the AC charging / discharging pile to charging mode, the connection between the PP terminal and the PE terminal can be disconnected by turning off switch K4, thus simulating a state where the charging gun is not inserted. Furthermore, when the AC charging / discharging pile is switched to charging mode after a preset time, switch K1 can be turned on to connect the CP terminal and the control guide circuit, so that the AC charging / discharging pile can communicate control signals with the vehicle during the charging mode operation.

[0060] S302. After a preset time, control the PP terminal and PE terminal to switch the AC charging / discharging pile to charging mode through the first resistor, or control the PP terminal and PE terminal to switch the AC charging / discharging pile to discharging mode through the second resistor.

[0061] Based on the aforementioned S301, when it is necessary to switch the AC charging and discharging pile to charging mode or discharging mode, the connection between the PP terminal and the PE terminal is disconnected to simulate the state of no plug-in. This enables the vehicle to better identify the subsequent charging and discharging mode switching of the AC charging and discharging pile after detecting the state of no plug-in. Therefore, after the AC charging and discharging pile simulates the state of no plug-in for a certain period of time (i.e., a preset time), the AC charging and discharging pile can be switched to the corresponding mode according to the required switching mode.

[0062] The preset duration can be configured according to actual needs. For example, the preset duration could be 500ms, etc., and there is no limit here.

[0063] In practical applications, a switch can be set in the corresponding circuit to control the switching between the PP and PE terminals via either a first resistor or a second resistor. Of course, other circuit structures can also be used to control the switching between the PP and PE terminals via either a first or second resistor; this is not a limitation here.

[0064] For example, with Figure 1Taking the AC charging / discharging pile shown as an example, the PP terminal and PE terminal can be connected through the first resistor by controlling the switch K3 to be connected to pin 1 (i.e., controlling the switch K3 to be connected to the first resistor). Additionally, the PP terminal and PE terminal can be connected through the second resistor by controlling the switch K3 to be connected to pin 2 (i.e., controlling the switch K3 to be connected to switch K4), thus turning on switch K4.

[0065] Based on this, and referring to the example in S301 above, in practical applications, as one implementation method, when the switch K3 in the AC charging / discharging pile is connected to pin 1, switch K1 is on, and the charging mode is active. When it is necessary to switch the AC charging / discharging pile to the discharging mode, the connection between the PP terminal and the PE terminal, as well as the connection between the CP terminal and the control circuit, can be disconnected by controlling switch K1 to open, switch K4 to open, and switch K3 to connect to pin 2, thereby simulating an unplugged state. Then, after a preset time, control K4 to open, so that the PP terminal and the PE terminal are connected through the second resistor, switching the AC charging / discharging pile to the discharging mode.

[0066] Alternatively, when the switch K3 in the AC charging / discharging station is connected to pin 2, switch K4 is on, and switch K1 is off, it is in discharge mode. When it is necessary to switch the AC charging / discharging station to charging mode, the connection between the PP terminal and the PE terminal can be disconnected by controlling switch K4 to simulate an unplugged state. Then, after a preset time, switch K1 can be turned on to connect the switch K3 to pin 1. This controls the PP terminal and the PE terminal to conduct through the first resistor, switching the AC charging / discharging station to charging mode.

[0067] As one possible implementation, the second resistor in the AC charging / discharging pile of this application embodiment can also be set as a variable resistor. Therefore, before controlling the PP terminal and PE terminal to conduct through the second resistor to switch the AC charging / discharging pile to discharge mode, the resistance value of the second resistor can be adjusted to the target resistance based on the required resistance value between the PP terminal and PE terminal for vehicle discharge (i.e., the target resistance). This ensures that the resistance value between the PP terminal and PE terminal of the AC charging / discharging pile meets the vehicle discharge requirements, and the variable resistor achieves compatibility of the AC charging / discharging pile with different vehicle discharge standards.

[0068] The target resistor can be pre-obtained. For example, a user can control the AC charging / discharging station to switch to discharge mode via a mobile application. During operation, the user can select the vehicle model to be discharged through the application. The application then sends the corresponding target resistor to the AC charging / discharging station's controller based on the vehicle model, allowing the charging / discharging station to obtain the target resistor before controlling the PP and PE terminals to conduct through the second resistor. Of course, in practical applications, the method of obtaining the target resistor can be configured according to the actual situation. For example, different target resistors for different vehicle models can be pre-set in the AC charging / discharging station, allowing the station to determine the corresponding target resistor based on the vehicle model after obtaining it in advance. This is not a limitation.

[0069] As another possible implementation, the AC charging and discharging pile in this embodiment can also be configured with a controllable on / off connection between the CP terminal and the PP terminal, for example, configured by means of a switch (e.g., Figure 1 The diagram shows the connection between the CP and PP terminals via switch K2. This allows for the control of the connection between the CP and PP terminals based on the vehicle's discharge requirements when switching the AC charging / discharging station to discharge mode.

[0070] For example, when switching the AC charging / discharging station to charging mode, the connection between the CP terminal and the PP terminal can be disconnected. When switching the AC charging / discharging station to discharging mode, the connection between the CP terminal and the PP terminal can be controlled to be on when the vehicle needs to discharge and disconnected when the vehicle does not need to discharge.

[0071] The discharge requirement, including whether the vehicle needs to connect to the CP and PP terminals, can be pre-defined. For example, a user can control the AC charging / discharging station to switch to discharge mode via a mobile application. During operation, the user can select the vehicle model to be discharged through the application. The application then sends the corresponding discharge requirement to the AC charging / discharging station's controller, allowing the station to pre-obtain the discharge requirement. Of course, in practical applications, the method of obtaining the discharge requirement can be configured according to actual needs. For instance, different vehicle models can be pre-set in the AC charging / discharging station, allowing it to pre-obtain the vehicle model and determine the corresponding discharge requirement. This is not a limitation.

[0072] In this embodiment, the live wire and neutral wire terminals of the AC charging / discharging pile, used to connect to the AC port of the vehicle to transmit electrical energy for vehicle discharge or charging, can be connected to the power grid and the load, respectively. Therefore, after the AC charging / discharging pile switches to discharge mode, when it is determined that the vehicle has started discharging, the connection between the live wire and neutral wire terminals and the power grid can be disconnected, and the connection between the live wire and neutral wire terminals and the load can be made conductive, thereby enabling the vehicle to discharge to the load through the AC charging / discharging pile's discharge mode. Similarly, after the AC charging / discharging pile switches to charging mode, the connection between the live wire and neutral wire terminals and the load is disconnected, and when the power grid has power, the connection between the live wire and neutral wire terminals and the power grid is made conductive, thereby enabling the vehicle to charge through the AC charging / discharging pile's charging mode. When the power grid is depleted, after the AC charging / discharging pile switches to charging mode, it can wait for the power grid to become active before reconnecting the live wire and neutral wire terminals to the power grid.

[0073] For example, with Figure 2 Taking the AC charging and discharging system shown as an example, after the AC charging and discharging station switches to discharging mode, when the vehicle starts discharging, the connection between the live and neutral terminals of the AC charging and discharging station and the power grid can be disconnected by controlling the AC contactor K5 to open. Then, the relay inside the AC charging and discharging station can be closed to connect the live and neutral terminals to the load, allowing the vehicle to discharge to the load through the AC charging and discharging station's discharging mode. Conversely, after the AC charging and discharging station switches to charging mode, when the power grid is active, the AC contactor K5 is closed to connect the power grid to the load, thus supplying power to the load through the power grid. When the power grid is depleted, the AC contactor K5 can be automatically closed after the power grid becomes active to connect the power grid to the load, supplying power to the load through the power grid.

[0074] For example, during the switching of charging or discharging modes, the AC charging and discharging pile can be powered by an auxiliary power source provided by the energy storage capacitor installed inside the pile to support the operation of the AC charging and discharging pile until the vehicle starts discharging or charging through the AC charging and discharging pile. Then, the vehicle or the power grid will provide auxiliary power to the AC charging and discharging pile to support its operation.

[0075] In one possible implementation of this application, after the AC charging / discharging pile connects the live wire and neutral wire terminals to the load, allowing the vehicle to supply power to the load through the AC charging / discharging pile, it can also acquire the output power of the AC charging / discharging pile to the load. Then, based on the output power and the vehicle's maximum output power, it determines whether to stop the vehicle's discharge. When it is necessary to stop the vehicle's discharge, the connection between the live wire and neutral wire terminals and the load can be disconnected, and then the AC charging / discharging pile can be switched to charging mode.

[0076] For example, the system can determine that the vehicle's discharge needs to be stopped when the output power is greater than or equal to the product of the vehicle's maximum output power and a first proportional threshold (e.g., 80%), less than or equal to the product of the vehicle's maximum output power and a second proportional threshold (e.g., 90%), and the duration is greater than or equal to a preset time (e.g., 1 minute). Alternatively, the system can determine that the vehicle's discharge needs to be stopped when the output power is greater than or equal to the product of the vehicle's maximum output power and a third proportional threshold (e.g., 100%). Here, the first proportional threshold is less than the second proportional threshold, and the second proportional threshold is less than the third proportional threshold. In practical applications, the first proportional threshold, the second proportional threshold, the third proportional threshold, and the preset time can all be configured according to actual conditions; no specific restrictions are imposed here.

[0077] Of course, in some embodiments of this application, when the vehicle normally ends its discharge, such as when the remaining charge of the vehicle's on-board battery reaches a threshold or when the user actively ends the vehicle's discharge, the AC charging and discharging pile can also control the connection between the live wire terminal and the neutral wire terminal and the load to be disconnected, and then control the AC charging and discharging pile to switch to charging mode.

[0078] In this embodiment, the proximity guide terminal and ground terminal of the AC charging / discharging pile are connected in parallel via a first resistor and a second resistor with different resistance values. This allows the AC charging / discharging pile to switch its charging and discharging modes by changing the connection between the proximity guide terminal and the ground terminal via the first resistor or via the second resistor. This enables vehicles to be charged or discharged through the AC charging / discharging pile, improving the convenience for users. Furthermore, before switching charging or discharging modes, the connection between the proximity guide terminal and the ground terminal can be disconnected to make the resistance between them infinitely high, simulating a disconnected state between the charging / discharging pile's charging gun and the vehicle. This allows the vehicle to better recognize the subsequent charging or discharging mode switch and correctly initiate charging or discharging. Therefore, users do not need to unplug the charging gun when switching between charging and discharging modes, further improving the convenience of using the AC charging / discharging pile.

[0079] The method embodiments of this application have been described in detail above with reference to the accompanying drawings. The apparatus embodiments of this application will now be described in detail. It should be understood that the descriptions of the apparatus embodiments correspond to the descriptions of the method embodiments; therefore, any parts not described in detail can be referred to the foregoing method embodiments.

[0080] This application also provides a control device for an AC charging / discharging station. The AC charging / discharging station includes a proximity guide PP terminal and a grounding PE terminal. The PP terminal is connected to the PE terminal via a first resistor and a second resistor. The first and second resistors are connected in parallel, and their resistance values ​​are different. The PP terminal and the PE terminal are not simultaneously connected through the first and second resistors. (Refer to...) Figure 4 As shown, the device includes: a control module 401, used to control the connection between the PP terminal and the PE terminal to be disconnected when it is necessary to switch the AC charging / discharging pile to charging mode or discharging mode; after a preset time, control the PP terminal and the PE terminal to switch the AC charging / discharging pile to charging mode through the first resistor, or control the PP terminal and the PE terminal to switch the AC charging / discharging pile to discharging mode through the second resistor.

[0081] In one possible implementation, the AC charging and discharging station further includes a control guide CP terminal, which is connected to the control guide circuit. The control module 401 is also used to disconnect the connection between the CP terminal and the control guide circuit. When it is necessary to switch the AC charging and discharging station to the charging mode, the method further includes: after a preset time, connecting the connection between the control CP terminal and the control guide circuit.

[0082] In one possible implementation, the second resistor is a variable resistor, and the control module 401 is also used to control the resistance value of the second resistor to be a target resistance value, which is the resistance value required for the vehicle connected to the AC charging and discharging pile to discharge, obtained in advance.

[0083] In one possible implementation, the CP terminal is also connected to the PP terminal, and the control module 401 is also used to control the disconnection of the connection between the CP terminal and the PP terminal; when switching the AC charging and discharging pile to the discharge mode, the method further includes: controlling the connection between the CP terminal and the PP terminal to be turned on or off according to the discharge demand of the vehicle connected to the AC charging and discharging pile.

[0084] In one possible implementation, the PP terminal is connected to a first resistor and a first switch via a switching switch, the first switch is connected to a second resistor, and the first and second resistors are connected to the PE terminal. The control module 401 is specifically used to control the switching switch to connect with the first switch and to control the first switch to disconnect, so as to disconnect the connection between the PP terminal and the PE terminal; to control the switching switch to connect with the first resistor, so as to connect the PP terminal and the PE terminal through the first resistor, thereby switching the AC charging / discharging pile to the charging mode; and to control the switching switch to connect with the first switch and to control the first switch to conduct, so as to connect the PP terminal and the PE terminal through the second resistor, thereby switching the AC charging / discharging pile to the discharging mode.

[0085] In one possible implementation, the AC charging and discharging pile also includes a live wire terminal and a neutral wire terminal, which are respectively connected to the power grid and to the load. The control module 401 is also used to control the connection between the live wire terminal and the neutral wire terminal and the power grid to be disconnected when the vehicle connected to the AC charging and discharging pile starts discharging; and to control the connection between the live wire terminal and the neutral wire terminal and the load to be connected.

[0086] In one possible implementation, the device further includes an acquisition module 402 for acquiring the output power of the AC charging / discharging pile to the load; and a control module 401 for determining whether it is necessary to stop the vehicle's discharge based on the output power and the vehicle's maximum output power; when it is determined that the vehicle's discharge needs to be stopped, controlling the connection between the live wire terminal and the neutral wire terminal and the load to be disconnected; and controlling the AC charging / discharging pile to switch to charging mode.

[0087] In one possible implementation, the control module 401 is specifically configured to determine that the vehicle's discharge needs to be stopped when the output power is greater than or equal to the product of the vehicle's maximum output power and a first proportional threshold, less than or equal to the product of the vehicle's maximum output power and a second proportional threshold, and the duration is greater than or equal to a preset time; and / or, determine that the vehicle's discharge needs to be stopped when the output power is greater than or equal to the product of the vehicle's maximum output power and a third proportional threshold; wherein the first proportional threshold is less than the second proportional threshold, and the second proportional threshold is less than the third proportional threshold.

[0088] In one possible implementation, the AC charging and discharging station also includes a live wire terminal and a neutral wire terminal, which are respectively connected to the power grid and to the load. The control module 401 is also used to control the connection between the live wire terminal and the neutral wire terminal and the load to disconnect; and to control the connection between the live wire terminal and the neutral wire terminal and the power grid to be turned on when the power grid is energized.

[0089] This application embodiment also provides an AC charging and discharging pile, including: a proximity guide PP terminal and a grounding PE terminal, wherein the PP terminal is connected to the PE terminal through a first resistor and a second resistor, the first resistor and the second resistor are connected in parallel, the resistance values ​​of the first resistor and the second resistor are different, and the PP terminal and the PE terminal are not simultaneously connected through the first resistor and the second resistor, and further includes a controller for executing the method as described in any embodiment.

[0090] This application also provides a computer-readable storage medium storing program code thereon, the program code being used by the controller of the AC charging and discharging pile to execute the method described in any of the preceding embodiments.

[0091] It should be understood that, in the embodiments of this application, determining B based on A does not mean determining B solely based on A; B can also be determined based on A and / or other information.

[0092] It should be understood that in the embodiments of this application, "B corresponding to A" means that B is associated with A, and B can be determined based on A. However, it should also be understood that determining B based on A does not mean that B is determined solely based on A; B can also be determined based on A and / or other information.

[0093] It should be understood that the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0094] It should be understood that in the various embodiments of this application, the order of the above-mentioned processes does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0095] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0096] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0097] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0098] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented in software, it can be implemented, in whole or in part, as a computer program product. A computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the flow or function according to the embodiments of this application is generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can read or a data storage device such as a server or data center that integrates one or more available media. The available media can be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., digital video discs, DVDs) or semiconductor media (e.g., solid-state disks, SSDs) etc.

[0099] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A control method for an AC charging and discharging pile, characterized in that, The AC charging / discharging pile includes a proximity guide PP terminal and a grounding PE terminal. The PP terminal is connected to the PE terminal through a first resistor and a second resistor. The first resistor and the second resistor are connected in parallel and have different resistance values. The PP terminal and the PE terminal are not simultaneously connected through the first resistor and the second resistor. The method includes: When it is necessary to switch the AC charging / discharging pile to charging mode or discharging mode, the connection between the PP terminal and the PE terminal is disconnected. After a preset duration, the PP terminal and the PE terminal are switched to charging mode via the first resistor, or the PP terminal and the PE terminal are switched to discharging mode via the second resistor.

2. The method according to claim 1, characterized in that, The AC charging / discharging station also includes a control guide CP terminal, which is connected to a control guide circuit. When it is necessary to switch the AC charging / discharging station to discharge mode, the method further includes: The connection between the CP terminal and the control guidance circuit is disconnected. When it is necessary to switch the AC charging / discharging pile to charging mode, the method further includes: After the preset time period, the connection between the CP terminal and the control guidance circuit is turned on.

3. The method according to claim 1, characterized in that, The second resistor is a variable resistor. Before switching the AC charging / discharging pile to discharge mode by controlling the PP terminal and the PE terminal to conduct through the second resistor, the method further includes: The resistance value of the second resistor is controlled to be a target resistance, which is the resistance value required for the vehicle connected to the AC charging and discharging pile to discharge, which is obtained in advance.

4. The method according to claim 2, characterized in that, The CP terminal is also connected to the PP terminal. When switching the AC charging / discharging pile to charging mode, the method further includes: Disconnection is controlled between the CP terminal and the PP terminal; When switching the AC charging / discharging pile to discharge mode, the method further includes: Based on the discharge requirements of the vehicle connected to the AC charging and discharging pile, the connection between the CP terminal and the PP terminal is controlled to be turned on or off.

5. The method according to any one of claims 1-4, characterized in that, The PP terminal is connected to the first resistor and the first switch respectively via a switching switch, the first switch is connected to the second resistor, and the first resistor and the second resistor are respectively connected to the PE terminal; The control of disconnecting the connection between the PP terminal and the PE terminal includes: Control the switching switch to connect with the first switch, and control the first switch to disconnect, so as to disconnect the connection between the PP terminal and the PE terminal; The control of switching the AC charging / discharging pile to charging mode via the first resistor between the PP terminal and the PE terminal includes: Control the switching switch to connect with the first resistor, so that the PP terminal and the PE terminal are connected through the first resistor, thereby switching the AC charging and discharging pile to the charging mode; The control of switching the AC charging / discharging pile to discharge mode via the second resistor between the PP terminal and the PE terminal includes: The switching switch is controlled to connect with the first switch, and the first switch is controlled to conduct, so that the PP terminal and the PE terminal are connected through the second resistor, thereby switching the AC charging and discharging pile to the discharge mode.

6. The method according to any one of claims 1-4, characterized in that, The AC charging / discharging station further includes a live wire terminal and a neutral wire terminal, which are respectively connected to the power grid and to the load. After controlling the PP terminal and PE terminal to switch the AC charging / discharging station to discharge mode through the second resistor, the method further includes: When a vehicle connected to the AC charging / discharging pile starts discharging, the connection between the live wire terminal and the neutral wire terminal and the power grid is disconnected. Control the connection between the live wire terminal and the neutral wire terminal and the load.

7. The method according to claim 6, characterized in that, After the live wire terminal and the neutral wire terminal are connected to the load, the method further includes: Obtain the output power of the AC charging and discharging pile to the load; Based on the output power and the vehicle's maximum output power, determine whether it is necessary to stop the vehicle's discharge. When it is determined that the vehicle discharge needs to be stopped, the connection between the power terminal and the neutral terminal and the load is disconnected. Control the AC charging / discharging pile to switch to charging mode.

8. The method according to claim 7, characterized in that, The step of determining whether to stop the vehicle's discharge based on the output power and the vehicle's maximum output power includes: When the output power is greater than or equal to the product of the vehicle's maximum output power and a first proportional threshold, less than or equal to the product of the vehicle's maximum output power and a second proportional threshold, and the duration is greater than or equal to a preset time, it is determined that the vehicle's discharge needs to be stopped; and / or, When the output power is greater than or equal to the product of the vehicle's maximum output power and a third proportional threshold, it is determined that the vehicle's discharge needs to be stopped. Wherein, the first ratio threshold is less than the second ratio threshold, and the second ratio threshold is less than the third ratio threshold.

9. The method according to any one of claims 1-4, characterized in that, The AC charging / discharging station further includes a live wire terminal and a neutral wire terminal, which are respectively connected to the power grid and to a load. After controlling the PP terminal and PE terminal to switch the AC charging / discharging station to charging mode through the first resistor, the method further includes: Disconnect the connection between the live wire terminal and the neutral wire terminal and the load; When the power grid is energized, the connection between the live wire terminal and the neutral wire terminal and the power grid is activated.

10. A control device for an AC charging and discharging pile, characterized in that, The AC charging / discharging pile includes a proximity guide PP terminal and a grounding PE terminal. The PP terminal is connected to the PE terminal through a first resistor and a second resistor. The first resistor and the second resistor are connected in parallel and have different resistance values. The PP terminal and the PE terminal are not simultaneously connected through the first resistor and the second resistor. The device includes: The control module is used to disconnect the connection between the PP terminal and the PE terminal when it is necessary to switch the AC charging / discharging pile to charging mode or discharging mode; after a preset time, it controls the PP terminal and the PE terminal to conduct through the first resistor to switch the AC charging / discharging pile to charging mode, or controls the PP terminal and the PE terminal to conduct through the second resistor to switch the AC charging / discharging pile to discharging mode.

11. An AC charging and discharging station, characterized in that, include: The device includes a proximity guide PP terminal and a ground PE terminal, wherein the PP terminal is connected to the PE terminal via a first resistor and a second resistor, the first resistor and the second resistor are connected in parallel, the first resistor and the second resistor have different resistance values, and the PP terminal and the PE terminal are not simultaneously connected through the first resistor and the second resistor, and also includes a controller for performing the method as described in any one of claims 1 to 8.

12. The AC charging and discharging pile according to claim 11, characterized in that, The PP terminal is connected to the first resistor and the first switch via a switching switch, the first switch is connected to the second resistor, and the first resistor and the second resistor are connected to the PE terminal.

13. A computer-readable storage medium, characterized in that, It stores program code that is used by the controller of the AC charging and discharging pile to execute the method as described in any one of claims 1 to 9.

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