Method for detecting charging pile faults, controller of charging pile, and charging pile

Abstract

The present application provides a method for detecting charging pile faults, a controller of a charging pile, and a charging pile, which can improve the efficiency of detecting switch adhesion faults. The method includes: performing insulation detection on a first charging terminal and a second charging terminal respectively when a first switch and a second switch are disconnected. The first charging terminal is connected to a first power module, and the second charging terminal is connected to a second power module. The first switch is used to connect the first charging terminal to a third power module, and the second switch is used to connect the second charging terminal to a third power module. Wherein, the insulation impedance of the first charging terminal is greater than or equal to a first threshold value, and the insulation impedance of the second charging terminal is greater than or equal to the first threshold value; performing insulation detection on the first charging terminal and the second charging terminal respectively when the first switch is closed; if the insulation impedance of the first charging terminal is less than the first threshold value and the insulation impedance of the second charging terminal is less than the first threshold value, it is determined that the second switch has an adhesion fault.

Description

Technical Field

[0001] The present application relates to the field of energy, and more particularly, to a method for detecting charging pile faults, a controller of a charging pile, and a charging pile. Background Art

[0002] In recent years, the number of electric vehicles and DC charging piles has been increasing day by day. In order to meet the charging power requirements of different vehicle models, the concept of power sharing charging equipment has been proposed. The power modules used for charging are shared. When charging an electric vehicle with a high power requirement, multiple power modules can be mobilized to charge simultaneously; when charging an electric vehicle with a low power requirement, a small number of power modules can be connected for charging.

[0003] The sharing of multiple power modules enables the arbitrary allocation of power modules to charging terminals. However, the charging pile system uses a large number of switches, and switch adhesion faults are likely to occur during long-term operation. Currently, there is no mature automatic diagnosis technology for switch adhesion faults. It takes time and effort for staff to observe on-site to determine whether a switch adhesion fault has occurred, and the efficiency is not high. Summary of the Invention

[0004] The present application provides a method for detecting charging pile faults, a controller of a charging pile, and a charging pile, which can improve the efficiency of detecting switch adhesion faults.

[0005] In a first aspect, a method for detecting charging pile faults is provided. The charging pile includes a first power module, a second power module, a third power module, a first charging terminal, a second charging terminal, a first switch, and a second switch. The method includes: when the first switch and the second switch are disconnected, performing insulation detection on the first charging terminal and the second charging terminal respectively. The first charging terminal is connected to the first power module, the second charging terminal is connected to the second power module, the first switch is used to connect the first charging terminal to the third power module, the second switch is used to connect the second charging terminal to the third power module, and the third power module is a shared power module. Wherein, the insulation impedance of the first charging terminal is greater than or equal to a first threshold, and the insulation impedance of the second charging terminal is greater than or equal to the first threshold; when the first switch is closed, performing insulation detection on the first charging terminal and the second charging terminal respectively; if the insulation impedance of the first charging terminal is less than the first threshold and the insulation impedance of the second charging terminal is less than the first threshold, it is determined that the second switch has an adhesion fault.

[0006] Based on the above technical solution, before closing the switch between the shared power module and the charging terminal, the insulation detection can be periodically performed on all charging terminals in the charging pile respectively; after closing the switch between the shared power module and the charging terminal in the charging pile, the insulation detection can be simultaneously performed on this charging terminal and any one or more other charging terminals in the charging pile respectively. According to the detected insulation impedance, it can be judged whether the switch for connecting the shared power module and any one or more other charging terminals has an adhesion fault. In this solution, the insulation detection of the charging terminal can be triggered when the vehicle accesses the charging terminal, or can be spontaneously triggered by the controller in the charging pile, which can realize the automatic diagnosis of the switch adhesion fault without connecting a simulated measurement load to each charging terminal of the charging pile to be tested; in addition, this solution can simultaneously judge whether one or more switches have an adhesion fault, which can improve the efficiency of detecting the switch adhesion fault compared with the insulation detection method that only considers single-point faults in the prior art.

[0007] Combined with the first aspect, in some implementation manners of the first aspect, if the insulation impedance of the first charging terminal is less than the first threshold and the insulation impedance of the second charging terminal is greater than or equal to the first threshold, it is determined that the second switch does not have an adhesion fault; if the insulation impedance of the first charging terminal is greater than or equal to the first threshold and the insulation impedance of the second charging terminal is greater than or equal to the first threshold, it is determined that the second switch does not have an adhesion fault.

[0008] Combined with the first aspect, in some implementation manners of the first aspect, the method further includes: when the first switch is disconnected and the second switch is closed, performing insulation detection on the first charging terminal and the second charging terminal respectively; if the insulation impedance of the first charging terminal is less than the first threshold and the insulation impedance of the second charging terminal is less than the first threshold, it is determined that the first switch has an adhesion fault.

[0009] Combined with the first aspect, in some implementation manners of the first aspect, if the insulation impedance of the first charging terminal is greater than or equal to the first threshold and the insulation impedance of the second charging terminal is greater than or equal to the first threshold, it is determined that the first switch does not have an adhesion fault; if the insulation impedance of the first charging terminal is greater than or equal to the first threshold and the insulation impedance of the second charging terminal is less than the first threshold, it is determined that the first switch does not have an adhesion fault.

[0010] Combined with the first aspect, in some implementation manners of the first aspect, before closing the first switch, the method further includes: a first vehicle accessing the first charging terminal.

[0011] Second aspect, a controller for a charging pile is provided. The charging pile includes a first power module, a second power module, a third power module, a first charging terminal, a second charging terminal, a first switch, a second switch, and the controller. The controller includes: a control circuit for triggering insulation detection on the first charging terminal and the second charging terminal respectively when the first switch and the second switch are disconnected. The first charging terminal is connected to the first power module, and the second charging terminal is connected to the second power module. The first switch is used to connect the first charging terminal to the third power module, and the second switch is used to connect the second charging terminal to the third power module. The third power module is a shared power module. Wherein, the insulation impedance of the first charging terminal is greater than or equal to a first threshold, and the insulation impedance of the second charging terminal is greater than or equal to the first threshold; the control circuit is further used for triggering insulation detection on the first charging terminal and the second charging terminal respectively when the first switch is closed; a processing circuit for determining that the second switch has a sticking fault if the insulation impedance of the first charging terminal is less than the first threshold and the insulation impedance of the second charging terminal is less than the first threshold.

[0012] In combination with the second aspect, in some implementation manners of the second aspect, the processing circuit is further used for: determining that the second switch does not have a sticking fault if the insulation impedance of the first charging terminal is less than the first threshold and the insulation impedance of the second charging terminal is greater than or equal to the first threshold; determining that the second switch does not have a sticking fault if the insulation impedance of the first charging terminal is greater than or equal to the first threshold and the insulation impedance of the second charging terminal is greater than or equal to the first threshold.

[0013] In combination with the second aspect, in some implementation manners of the second aspect, the control circuit is further used for triggering insulation detection on the first charging terminal and the second charging terminal respectively when the first switch is disconnected and the second switch is closed; the processing circuit is further used for determining that the first switch has a sticking fault if the insulation impedance of the first charging terminal is less than the first threshold and the insulation impedance of the second charging terminal is less than the first threshold.

[0014] In combination with the second aspect, in some implementation manners of the second aspect, the processing circuit is further used for: determining that the first switch does not have a sticking fault if the insulation impedance of the first charging terminal is greater than or equal to the first threshold and the insulation impedance of the second charging terminal is greater than or equal to the first threshold; determining that the first switch does not have a sticking fault if the insulation impedance of the first charging terminal is greater than or equal to the first threshold and the insulation impedance of the second charging terminal is less than the first threshold.

[0015] In combination with the second aspect, in some implementations of the second aspect, the control circuit is further configured to sense that a first vehicle is connected to the first charging terminal.

[0016] In a third aspect, a charging pile is provided, including: a first power module, a second power module, a third power module, a first charging terminal, a second charging terminal, a first switch, a second switch, and a controller; the controller is configured to trigger insulation detection on the first charging terminal and the second charging terminal respectively when the first switch and the second switch are turned off. The first charging terminal is connected to the first power module, the second charging terminal is connected to the second power module, the third power module is a shared power module, the first switch is used to connect the first charging terminal to the third power module, and the second switch is used to connect the second charging terminal to the third power module. Wherein, the insulation impedance of the first charging terminal is greater than or equal to a first threshold, and the insulation impedance of the second charging terminal is greater than or equal to the first threshold; the controller is further configured to trigger insulation detection on the first charging terminal and the second charging terminal respectively when the first switch is closed; the controller is further configured to determine that the second switch has a sticking fault if the insulation impedance of the first charging terminal is less than the first threshold and the insulation impedance of the second charging terminal is less than the first threshold.

[0017] In combination with the third aspect, in some implementations of the third aspect, the controller is further configured to: determine that the second switch does not have a sticking fault if the insulation impedance of the first charging terminal is less than the first threshold and the insulation impedance of the second charging terminal is greater than or equal to the first threshold; determine that the second switch does not have a sticking fault if the insulation impedance of the first charging terminal is greater than or equal to the first threshold and the insulation impedance of the second charging terminal is greater than or equal to the first threshold.

[0018] In combination with the third aspect, in some implementations of the third aspect, the controller is further configured to: trigger insulation detection on the first charging terminal and the second charging terminal respectively when the first switch is turned off and the second switch is turned on; determine that the first switch has a sticking fault if the insulation impedance of the first charging terminal is less than the first threshold and the insulation impedance of the second charging terminal is less than the first threshold.

[0019] In combination with the third aspect, in some implementation manners of the third aspect, the controller is further configured to: if the insulation impedance of the first charging terminal is greater than or equal to the first threshold and the insulation impedance of the second charging terminal is greater than or equal to the first threshold, determine that the first switch does not have an adhesion fault; if the insulation impedance of the first charging terminal is greater than or equal to the first threshold and the insulation impedance of the second charging terminal is less than the first threshold, determine that the first switch does not have an adhesion fault.

[0020] In combination with the third aspect, in some implementation manners of the third aspect, the controller is further configured to sense that a first vehicle is connected to the first charging terminal.

[0021] In a fourth aspect, a charging device is provided, including a processor and a transceiver. The transceiver is configured to receive computer code or instructions and transmit them to the processor, and the processor runs the computer code or instructions to implement the method in any of the possible implementation manners in the first aspect above.

[0022] In a fifth aspect, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a communication device, the communication device is enabled to implement the method in any of the possible implementation manners in any of the above aspects.

[0023] In a sixth aspect, a computer program product is provided. When it runs on a computer, the computer is enabled to execute the method in any of the possible implementation manners in the first aspect.

[0024] The solutions provided in the second to sixth aspects above are used to implement or cooperate with the method provided in the first aspect, and thus can achieve the same or corresponding beneficial effects as the first aspect, which will not be elaborated here. Description of the Drawings

[0025] Figure 1 is an intelligent power distribution flexible charging pile system for electric vehicles.

[0026] Figure 2 is a schematic block diagram of a method for detecting switch adhesion faults.

[0027] Figure 3 is a principle block diagram of an insulation detection method.

[0028] Figure 4 is a schematic diagram of a charging pile power sharing matrix.

[0029] Figure 5 is a schematic architecture diagram of a typical charging pile.

[0030] Figure 6It is a schematic flowchart of a method for detecting charging pile faults proposed in an embodiment of the present application.

[0031] Figure 7 It is a schematic diagram of the architecture of another charging pile.

[0032] Figure 8 It is a schematic diagram of the structure of a controller of a charging pile provided in an embodiment of the present application.

[0033] Figure 9 It is a schematic diagram of the structure of a charging device provided in an embodiment of the present application. Detailed implementation manners

[0034] Next, the technical solutions in the present application will be described in conjunction with the accompanying drawings.

[0035] In recent years, the number of electric vehicles and DC charging piles has been increasing day by day. In order to meet the charging power requirements of different vehicle models, the concept of power-sharing charging devices has been proposed. By sharing the power modules used for charging, when charging an electric vehicle with a high power requirement, multiple power modules can be mobilized to charge simultaneously; when charging an electric vehicle with a low power requirement, a small number of power modules can be connected for charging.

[0036] As Figure 1 shown, a power intelligent distribution flexible charging pile system for electric vehicles is presented, which can realize the arbitrary distribution of power modules to charging terminals. However, the charging pile system uses a large number of switches and is prone to switch adhesion faults during long-term operation. Among them, the switch adhesion fault refers to the incorrect closing of the switch. At present, there is no mature automatic diagnosis technology for switch adhesion faults, and it takes time and effort for staff to observe on-site to determine whether a switch adhesion fault has occurred, and the efficiency is not high.

[0037] The charging device sharing matrix is an effective means for the charger system to share the charging capacity and reduce costs. Sharing the charging capacity of power modules through a switch matrix is a common low-cost means. The switch matrix generally uses high-voltage switches for switching operations, and a common one is a high-voltage DC contactor as the execution unit. When a contact adhesion fault occurs in the contactor contacts, one of the common faults is the contact adhesion fault, resulting in an electrical connection between different charging piles; in some countries, due to the insulation requirements between different charging piles, the system cannot continue to work. Generally, it is necessary to use a disconnector to switch the sampling or indirect observation method to eliminate the contact adhesion fault, but it cannot be eliminated quickly.

[0038] Currently, a method for excluding switch adhesion faults by detecting the output power of a charging terminal has been proposed. In this method, a simulated test load is connected to each charging terminal in the charging stack to be tested, the flexible charging stack is started, and control signals are sent through the controller of the switch matrix to disconnect all switches. Then, the output power of each charging terminal is detected. At this time, if all switches in the switch matrix do not have adhesion faults, no power will be output from each charging terminal. If there is a charging terminal with power output, it indicates that there is a switch adhesion fault in the switch matrix.

[0039] If no charging terminal has power output, it is determined that all switches in the switch matrix do not have adhesion faults. If there is a charging terminal with power output and the output power is the output power of one power module, it is determined that there is a switch adhesion fault in the switch matrix. Further, control instructions are sent through the controller of the switch matrix to alternately close the series switches connected to the charging terminal with power output. If the output power of this charging terminal is twice the output power of the power module, it can be determined that the switch currently connected to this charging terminal does not have an adhesion fault. If the output power of this charging terminal is the output power of one power module, it can be determined that the switch currently connected to this charging terminal has an adhesion fault.

[0040] As Figure 2 shown, a schematic block diagram of a method for detecting switch adhesion faults is presented. The power module includes Power Module 1, Power Module 2, Power Module 3, Power Module 4, Power Module 5, and Power Module 6. All power modules can be connected to Charging Terminal 1, Charging Terminal 2, Charging Terminal 3, and Charging Terminal 4. The switches that can be connected to Charging Terminal 1 include Switch S 11 , Switch S 12 , Switch S 13 , Switch S 14 , Switch S 15 , and Switch S 16 . The switches that can be connected to Charging Terminal 2 include Switch S 21 , Switch S 22 , Switch S 23 , Switch S 24 , Switch S 25 , and Switch S 26 . The switches that can be connected to Charging Terminal 3 include Switch S 31 , Switch S 32 , Switch S 33 , Switch S 34 , Switch S 35 , and Switch S 36 . The switches that can be connected to Charging Terminal 4 include Switch S 41 , Switch S 42 , Switch S 43 , Switch S 44, switch S 45 and switch S 46 . Load 1 is connected to charging terminal 1, load 2 is connected to charging terminal 2, load 3 is connected to charging terminal 3, and load 4 is connected to charging terminal 4. The controller of the switch matrix issues a control signal to disconnect all switches, and detects the output power of each charging terminal. For example, if charging terminal 2 has power output and the output power is the output power of one power module, it means that one of the switches S 21 , switch S 22 , switch S 23 , switch S 24 , switch S 25 and switch S 26 in the switch matrix has a sticking fault. Further, the controller of the switch matrix issues a control instruction to close switches S 21 , switch S 22 , switch S 23 , switch S 24 , switch S 25 and switch S 26 in turn. If switch S 21 is closed and the output power of charging terminal 2 is twice the output power of the power module, it can be determined that switch S 21 has no sticking fault; if the output power of this charging terminal is the output power of one power module, it can be determined that switch S 21 has a sticking fault.

[0041] The method of excluding switch sticking faults by detecting the output power of charging terminals requires connecting simulated measurement loads to each charging terminal of the charging stack to be measured, and cannot achieve automatic diagnosis of switch sticking faults during use.

[0042] Currently, in addition to excluding switch sticking faults by the above method of detecting the output power of charging terminals, a method of excluding switch sticking faults by insulation detection has also been proposed.

[0043] For the convenience of understanding the embodiments of the present application, the principle of the insulation detection method is briefly described below.

[0044] As Figure 3As shown, the principle block diagram of the insulation detection method is presented. Before switches K5 and K6 are closed to charge the vehicle, the charger is responsible for the insulation detection inside the charger (charging pile); the insulation monitoring device (IMD) circuit of the charging pile is disconnected from the charging DC circuit through the switch, and during the charging process after switches K5 and K6 are closed, the vehicle is responsible for the insulation detection of the entire system. IMD measurement circuits are set in both the charging pile and the vehicle. The voltage value / current value collected by the IMD is provided to the controller of the charging pile, and the controller calculates the insulation impedance between the DC+ of the DC circuit and the ground wire (PE), and the insulation impedance between the DC- of the DC circuit and the PE. The minimum value is taken from the insulation impedance between the DC+ of the DC circuit and the PE and the insulation impedance between the DC- of the DC circuit and the PE to obtain the measured insulation impedance R. When this R is greater than or equal to 100Ω / V, the insulation detection result is normal and the vehicle can be charged; when this R is less than 100Ω / V, the insulation detection result is abnormal and the vehicle charging should be stopped.

[0045] The following specifically introduces how to determine the insulation impedance of the charging pile. When insulation detection is required, the charger controller controls switches K1 and K2 to close, and then changes the resistance voltage division state of the resistance bridge network by controlling the on / off of controllable switches K3 and K4. Assume that U1 and U2 are the voltages between the DC+ of the DC circuit, the DC- of the DC circuit and the PE when switches K3 and K4 are open, and U’1 and U’2 are the voltages between the DC+ of the DC circuit, the DC- of the DC circuit and the PE when switches K3 and K4 are closed; according to the following formulas (1) and (2), the equivalent insulation impedance R between the DC+ of the DC circuit and the PE can be calculated p and the equivalent insulation impedance R between the DC- of the DC circuit and the PE n .

[0046]

[0047]

[0048] Among them, U1, U2, U’1 and U’2 can be calculated from the sampling voltages at both ends of resistors R1 and R5. Calculate the equivalent insulation impedance R between the DC+ of the DC circuit and the PE p and the equivalent insulation impedance R between the DC- of the DC circuit and the PE n After that, take the minimum value of R p and R n ; the finally measured insulation impedance R of the charging pile = R J / UDC, where UDC is the voltage of the positive and negative busbars of the charging pile, and R J is the minimum value of R p and R n in it, and Rf+ is the sampling resistor corresponding to DC+ in the DC circuit, R f- is the sampling resistor corresponding to DC- in the DC circuit.

[0049] The principle of the above insulation detection method has been briefly described. Next, the charging pile system applicable to the insulation detection method will be introduced.

[0050] As Figure 4 shown, a schematic diagram of the charging pile power sharing matrix is presented. The charging pile includes at least two groups of power modules, and each group of power modules includes at least one power module. The power modules can be connected to different charging terminals through a switch matrix. The charging terminal is used to output the output power of the power module connected to the charging terminal to the device to be charged, and the device to be charged is generally an electric vehicle, etc. One group of power modules in the charging pile is a shared power module, and the other group of power modules is a fixed power module. The shared power module can be connected to any charging terminal in the charging pile, and the fixed power module is connected to a fixed charging terminal.

[0051] As Figure 5 shown, a schematic diagram of the architecture of a typical charging pile is presented. The charging pile includes a first power module, a second power module, a third power module, a first charging terminal, a second charging terminal, a first switch, a second switch, and a controller. The first charging terminal is connected to the first power module, the second charging terminal is connected to the second power module, and the third power module is a shared power module, and this shared power module can be connected to the first charging terminal or the second charging terminal. The first switch is used to connect the first charging terminal to the third power module, and the second switch is used to connect the second charging terminal to the third power module. The controller is the scheduling and control unit of the charging pile. In actual engineering applications, single-point failures are generally considered. The specific process of currently excluding switch adhesion failures through the insulation detection method includes:

[0052] (1) After vehicle 1 is connected to the first charging terminal, the first charging terminal requests the controller to connect the first power module to the first charging terminal; since vehicle 1 is connected to the first charging terminal, insulation detection of the first charging terminal is triggered;

[0053] (2) If the insulation detection result in step (1) is normal and vehicle 1 requires a greater output power, that is, the output power required by vehicle 1 is greater than the output power of one power module, then the controller schedules the third power module to be connected to the first charging terminal, that is, closes the first switch used to connect the first charging terminal to the third power module;

[0054] (3) Insulate the first charging terminal again. If the insulation test result is normal, the charging pile and vehicle 1 shake hands and subsequent charging operations are carried out; if the insulation test result is abnormal, after the charging pile gives an alarm, the first charging terminal stops charging vehicle 1. In the above solution, if a vehicle is connected to the first charging terminal, the first charging terminal is insulated and tested, and there is no need to perform insulation tests on other charging terminals. The above method for insulating detection that only considers single-point faults has a low efficiency in excluding switch adhesion faults.

[0055] For this reason, the embodiments of the present application propose a method for detecting charging pile faults, which can automatically detect whether the switches in the charging pile have adhesion faults and can improve the efficiency of detecting switch adhesion faults. Among them, the embodiments of the present application are applicable to Figure 5 the schematic architecture diagram of the charging pile shown.

[0056] The following will introduce in detail the specific implementation process of the method for detecting charging pile faults proposed in the embodiments of the present application.

[0057] As Figure 6 shown, a schematic flowchart of a method 600 for detecting charging pile faults proposed in the embodiments of the present application is presented.

[0058] The charging pile includes a first power module, a second power module, a third power module, a first charging terminal, a second charging terminal, a first switch, and a second switch; the third power module is a shared power module; the first switch is used to connect the first charging terminal to the third power module, and the second switch is used to connect the second charging terminal to the third power module.

[0059] 610. When the first switch and the second switch are disconnected, the first charging terminal and the second charging terminal are respectively subjected to insulation detection. Among them, the first charging terminal is connected to the first power module, and the second charging terminal is connected to the second power module. When the insulation impedance of the first charging terminal is greater than or equal to the first threshold and the insulation impedance of the second charging terminal is greater than or equal to the first threshold, step 620 is executed. That is to say, when the insulation detection result of the first charging terminal is normal and the insulation detection result of the second charging terminal is normal, step 620 is executed. Optionally, the first threshold is equal to 100 Ω / V.

[0060] The separate insulation detection of the first charging terminal and the second charging terminal here can be understood as separately insulating and detecting the first charging terminal and separately insulating and detecting the second charging terminal. The time for separately insulating and detecting the first charging terminal and the time for separately insulating and detecting the second charging terminal are different.

[0061] Optionally, it can be that the first vehicle accesses the first charging terminal to trigger the execution of step 610; or it can be that the controller in the charging pile regularly triggers the execution of step 610. That is to say, the charging pile can also perform insulation detection spontaneously without vehicle access. This application does not make specific limitations on this.

[0062] 620. When the first switch for connecting the first charging terminal and the third power module is closed and the second switch for connecting the second charging terminal and the third power module is not closed, insulation detection is simultaneously performed on the first charging terminal and the second charging terminal respectively. That is to say, insulation detection can be performed on the first charging terminal and the second charging terminal respectively at the same time.

[0063] It should be understood that when the first switch is closed and the second switch is not closed, performing insulation detection on the first charging terminal and the second charging terminal respectively at the same time can be used to determine whether the second switch has a sticking fault.

[0064] 630. If the insulation impedance of the first charging terminal is less than the first threshold and the insulation impedance of the second charging terminal is less than the first threshold, it is determined that the second switch has a sticking fault. That is to say, if the insulation detection result of the first charging terminal is abnormal and the insulation detection result of the second charging terminal is also abnormal, it is determined that the second switch has a sticking fault. It should be understood that when the first switch is closed and the second switch is not closed, the theoretical value of the insulation impedance of the second charging terminal should be greater than the first threshold; if the measured insulation impedance of the second charging terminal is less than the first threshold, it means that the second switch has a misclosure / sticking fault.

[0065] Exemplarily, if the insulation impedance of the first charging terminal is less than the first threshold and the insulation impedance of the second charging terminal is greater than or equal to the first threshold, it is determined that the second switch does not have a sticking fault. That is to say, if the insulation detection result of the first charging terminal is abnormal and the insulation detection result of the second charging terminal is normal, it is determined that the second switch does not have a sticking fault.

[0066] Exemplarily, if the insulation impedance of the first charging terminal is greater than or equal to the first threshold and the insulation impedance of the second charging terminal is greater than or equal to the first threshold, it is determined that the second switch does not have a sticking fault. That is to say, if the insulation detection result of the first charging terminal is normal and the insulation detection result of the second charging terminal is normal, it is determined that the second switch does not have a sticking fault.

[0067] Optionally, when the first switch is disconnected and the second switch is closed, insulation detection can be performed on the first charging terminal and the second charging terminal simultaneously to determine whether the first switch has an adhesion fault. Exemplarily, if the insulation impedance of the first charging terminal is less than the first threshold and the insulation impedance of the second charging terminal is less than the first threshold, it is determined that the first switch has an adhesion fault; that is, if the insulation detection result of the first charging terminal is abnormal and the insulation detection result of the second charging terminal is abnormal, it is determined that the first switch has an adhesion fault.

[0068] Exemplarily, if the insulation impedance of the first charging terminal is greater than or equal to the first threshold and the insulation impedance of the second charging terminal is greater than or equal to the first threshold, it is determined that the first switch does not have an adhesion fault; that is, if the insulation detection result of the first charging terminal is normal and the insulation detection result of the second charging terminal is normal, it is determined that the first switch does not have an adhesion fault.

[0069] Exemplarily, if the insulation impedance of the first charging terminal is greater than or equal to the first threshold and the insulation impedance of the second charging terminal is less than the first threshold, it is determined that the first switch does not have an adhesion fault; that is, if the insulation detection result of the first charging terminal is normal and the insulation detection result of the second charging terminal is abnormal, it is determined that the first switch does not have an adhesion fault.

[0070] The embodiments of the present application are applicable not only to the case where the charging pile includes a first charging terminal and a second charging terminal, but also to the case where the charging pile includes more than two charging terminals. An example is given below.

[0071] As Figure 7 shown, a schematic diagram of the architecture of another charging pile is presented. For example, the charging pile includes N charging terminals, N + 1 power modules, and N switches, where N is an integer greater than 2. Among the N charging terminals, there are a first charging terminal, a second charging terminal, and an Nth charging terminal. Among the N + 1 power modules, there are a first power module, a second power module, a third power module, and an (N + 1)th power module. Among the N switches, there are a first switch, a second switch, and an Nth switch. The first charging terminal is connected to the first power module, the second charging terminal is connected to the second power module, the Nth charging terminal is connected to the (N + 1)th power module, and the third power module is a shared power module; the first switch is used to connect the first charging terminal to the third power module, the second switch is used to connect the second charging terminal to the third power module; the Nth switch is used to connect the Nth charging terminal to the third power module. The process of fault detection of this charging pile is as follows:

[0072] Step 1: With the first switch, the second switch, and the Nth switch open, perform insulation detection on the first charging terminal, the second charging terminal, and the Nth charging terminal respectively. Among them, the first charging terminal is connected to the first power module, the second charging terminal is connected to the second power module, and the Nth charging terminal is connected to the (N + 1)th power module. When the insulation impedance of the first charging terminal is greater than or equal to the first threshold, the insulation impedance of the second charging terminal is greater than or equal to the first threshold, and the insulation impedance of the Nth charging terminal is greater than or equal to the first threshold, execute step 620. That is to say, when the insulation detection result of the first charging terminal is normal, the insulation detection result of the second charging terminal is normal, and the insulation detection result of the Nth charging terminal is normal, execute step 2.

[0073] Performing insulation detection on the first charging terminal, the second charging terminal, and the Nth charging terminal respectively can be understood as performing insulation detection on the first charging terminal alone, performing insulation detection on the second charging terminal alone, and performing insulation detection on the Nth charging terminal alone. The time for performing insulation detection on the first charging terminal alone, the time for performing insulation detection on the second charging terminal alone, and the time for performing insulation detection on the Nth charging terminal alone are different respectively.

[0074] Step 2: With the first switch for connecting the first charging terminal to the third power module closed, the second switch for connecting the second charging terminal to the third power module not closed, and the Nth switch for connecting the Nth charging terminal to the third power module not closed, perform insulation detection on the first charging terminal, the second charging terminal, and the Nth charging terminal simultaneously and respectively. That is to say, perform insulation detection on the first charging terminal, the second charging terminal, and the Nth charging terminal at the same time.

[0075] Step 3: If the insulation detection result of the first charging terminal is abnormal and the insulation detection result of the Nth charging terminal is also abnormal, then it is determined that the Nth switch has a sticking fault. Or, if the insulation detection result of the first charging terminal is abnormal, the insulation detection result of the second charging terminal is abnormal, and the insulation detection result of the Nth charging terminal is also abnormal, then it is determined that both the second switch and the Nth switch have sticking faults.

[0076] In the technical solution provided by the embodiment of the present application, before closing the switch between the shared power module and the charging terminal, the insulation detection can be periodically performed on all charging terminals in the charging pile respectively; after closing the switch between the shared power module and the charging terminal in the charging pile, the insulation detection can be simultaneously performed on this charging terminal and any one or more other charging terminals in the charging pile respectively. According to the detected insulation impedance, it can be determined whether the switch for connecting the shared power module and any one or more other charging terminals has an adhesion fault. In this solution, the insulation detection of the charging terminal can be triggered when the vehicle is connected to the charging terminal, or can be spontaneously triggered by the controller in the charging pile, which can realize the automatic diagnosis of the switch adhesion fault without connecting a simulated measurement load to each charging terminal of the charging pile to be tested; in addition, this solution can simultaneously determine whether one or more switches have an adhesion fault, which can improve the efficiency of detecting the switch adhesion fault compared with the prior art insulation detection method that only considers single-point faults.

[0077] The method for detecting the charging pile fault provided by the embodiment of the present application is introduced above. Next, the device for executing the method for detecting the charging pile fault will be introduced.

[0078] As Figure 8 shown, a schematic structural diagram of a controller 800 of a charging pile provided by the embodiment of the present application is presented. The charging pile includes a first power module, a second power module, a third power module, a first charging terminal, a second charging terminal, a first switch, a second switch, and this controller. The controller 800 includes:

[0079] A control circuit 810, configured to trigger the insulation detection of the first charging terminal and the second charging terminal respectively when the first switch and the second switch are disconnected. The first charging terminal is connected to the first power module, the second charging terminal is connected to the second power module, the first switch is used to connect the first charging terminal and the third power module, the second switch is used to connect the second charging terminal and the third power module, and the third power module is a shared power module. Wherein, the insulation impedance of the first charging terminal is greater than or equal to a first threshold, and the insulation impedance of the second charging terminal is greater than or equal to the first threshold;

[0080] The control circuit 810 is further configured to trigger the insulation detection of the first charging terminal and the second charging terminal respectively when the first switch is closed;

[0081] A processing circuit 820, configured to determine that the second switch has an adhesion fault if the insulation impedance of the first charging terminal is less than the first threshold and the insulation impedance of the second charging terminal is less than the first threshold.

[0082] Optionally, the processing circuit 820 is further configured to:

[0083] If the insulation impedance of the first charging terminal is less than the first threshold and the insulation impedance of the second charging terminal is greater than or equal to the first threshold, it is determined that the second switch does not have an adhesion fault;

[0084] If the insulation impedance of the first charging terminal is greater than or equal to the first threshold and the insulation impedance of the second charging terminal is greater than or equal to the first threshold, it is determined that the second switch does not have an adhesion fault.

[0085] Optionally, the control circuit 810 is further configured to, when the first switch is disconnected and the second switch is closed, trigger insulation detection on the first charging terminal and the second charging terminal respectively;

[0086] The processing circuit 820 is further configured to, if the insulation impedance of the first charging terminal is less than the first threshold and the insulation impedance of the second charging terminal is less than the first threshold, determine that the first switch has an adhesion fault.

[0087] Optionally, the processing circuit 820 is further configured to:

[0088] If the insulation impedance of the first charging terminal is greater than or equal to the first threshold and the insulation impedance of the second charging terminal is greater than or equal to the first threshold, it is determined that the first switch does not have an adhesion fault;

[0089] If the insulation impedance of the first charging terminal is greater than or equal to the first threshold and the insulation impedance of the second charging terminal is less than the first threshold, it is determined that the first switch does not have an adhesion fault.

[0090] Optionally, the control circuit 810 is further configured to sense that a first vehicle is connected to the first charging terminal.

[0091] As Figure 5 shown, a schematic diagram of the architecture of the charging pile provided by the embodiment of the present application is presented, including: a first power module, a second power module, a third power module, a first charging terminal, a second charging terminal, a first switch, a second switch, and a controller;

[0092] The controller is configured to trigger insulation detection for the first charging terminal and the second charging terminal respectively when the first switch and the second switch are open. The first charging terminal is connected to the first power module, the second charging terminal is connected to the second power module, and the third power module is a shared power module. The first switch is used to connect the first charging terminal to the third power module, and the second switch is used to connect the second charging terminal to the third power module. Wherein, the insulation impedance of the first charging terminal is greater than or equal to a first threshold, and the insulation impedance of the second charging terminal is greater than or equal to the first threshold;

[0093] The controller is further configured to trigger insulation detection for the first charging terminal and the second charging terminal respectively when the first switch is closed;

[0094] The controller is further configured to determine that the second switch has a sticking fault if the insulation impedance of the first charging terminal is less than the first threshold and the insulation impedance of the second charging terminal is less than the first threshold.

[0095] Optionally, the controller is further configured to: determine that the second switch does not have a sticking fault if the insulation impedance of the first charging terminal is less than the first threshold and the insulation impedance of the second charging terminal is greater than or equal to the first threshold; determine that the second switch does not have a sticking fault if the insulation impedance of the first charging terminal is greater than or equal to the first threshold and the insulation impedance of the second charging terminal is greater than or equal to the first threshold.

[0096] Optionally, the controller is further configured to: trigger insulation detection for the first charging terminal and the second charging terminal respectively when the first switch is open and the second switch is closed; determine that the first switch has a sticking fault if the insulation impedance of the first charging terminal is less than the first threshold and the insulation impedance of the second charging terminal is less than the first threshold.

[0097] Optionally, the controller is further configured to: determine that the first switch does not have a sticking fault if the insulation impedance of the first charging terminal is greater than or equal to the first threshold and the insulation impedance of the second charging terminal is greater than or equal to the first threshold; determine that the first switch does not have a sticking fault if the insulation impedance of the first charging terminal is greater than or equal to the first threshold and the insulation impedance of the second charging terminal is less than the first threshold.

[0098] Optionally, the controller is further configured to sense that a first vehicle is connected to the first charging terminal.

[0099] An embodiment of the present application provides a charging device, such asFigure 9 As shown, a schematic structural diagram of a charging device 900 according to an embodiment of the present application is presented.

[0100] The device 900 includes: a processor 910 and a transceiver 920. The transceiver 920 is configured to receive computer code or instructions and transmit them to the processor 910. The processor 910 runs the computer code or instructions, such as the method in any possible implementation manner in the embodiment of the present application.

[0101] The above-mentioned processor 910 may be an integrated circuit chip with signal processing capabilities. During implementation, each step of the above method embodiment can be completed by the integrated logic circuit in the hardware of the processor or instructions in software form. The above-mentioned processor may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. It can implement or execute each method, step, and logic block diagram disclosed in the embodiment of the present application. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc. The steps of the method disclosed in combination with the embodiment of the present application can be directly embodied as being executed by a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software module may be located in a mature storage medium in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, etc. This storage medium is located in the memory, and the processor reads the information in the memory and combines its hardware to complete the steps of the above method.

[0102] The embodiment of the present application also provides a computer-readable storage medium, on which a computer program for implementing the method in the above method embodiment is stored. When the computer program runs on a computer or a processor, the computer or the processor can implement the method in the above method embodiment.

[0103] The embodiment of the present application also provides a computer program product. The computer program product includes computer program code. When the computer program code runs on a computer, the method in the above method embodiment is executed.

[0104] An embodiment of the present application further provides a chip, including a processor, the processor is connected to a memory, the memory is used to store a computer program, and the processor is used to execute the computer program stored in the memory so that the chip executes the method in the above method embodiment.

[0105] In addition, the term "and / or" in the present application is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. These three situations. In addition, the character " / " in this article generally represents an "or" relationship between the front and back associated objects; the term "at least one" in the present application can represent "one" and "two or more", for example, among A, B, and C, it can represent: A exists alone, B exists alone, C exists alone, A and B exist simultaneously, A and C exist simultaneously, C and B exist simultaneously, and A, B, and C exist simultaneously. These seven situations.

[0106] Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present application.

[0107] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the above-described systems, devices, and units can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0108] In several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division, and there can be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or direct coupling or communication connection to each other can be through some interfaces, and the indirect coupling or communication connection of the device or unit can be in an electrical, mechanical or other form.

[0109] The unit described as a separation component may or may not be physically separated. The component shown as a unit may or may not be a physical unit, that is, it may be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0110] In addition, in each embodiment of the present application, each functional unit may be integrated in a processing unit, may exist physically separately for each unit, or two or more units may be integrated in one unit.

[0111] If the above functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art or a part of this technical solution can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in each embodiment of the present application. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical discs that can store program codes.

[0112] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present application can easily think of changes or substitutions, which should all be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claimed rights.

Claims

1. A method for detecting charging pile faults, characterized in that, The charging pile includes a first power module, a second power module, a third power module, a first charging terminal, a second charging terminal, a first switch, and a second switch. The method includes: When the first switch and the second switch are open, insulation detection is respectively performed on the first charging terminal and the second charging terminal. The first charging terminal is connected to the first power module, and the second charging terminal is connected to the second power module. The first switch is used to connect the first charging terminal to the third power module, and the second switch is used to connect the second charging terminal to the third power module. The third power module is a shared power module. Wherein, the insulation impedance of the first charging terminal is greater than or equal to a first threshold, and the insulation impedance of the second charging terminal is greater than or equal to the first threshold; When the first switch is closed, insulation detection is respectively performed on the first charging terminal and the second charging terminal; If the insulation impedance of the first charging terminal is less than the first threshold and the insulation impedance of the second charging terminal is less than the first threshold, it is determined that the second switch has a sticking fault.

2. The method according to claim 1, wherein: If the insulation impedance of the first charging terminal is less than the first threshold and the insulation impedance of the second charging terminal is greater than or equal to the first threshold, it is determined that the second switch does not have a sticking fault; If the insulation impedance of the first charging terminal is greater than or equal to the first threshold and the insulation impedance of the second charging terminal is greater than or equal to the first threshold, it is determined that the second switch does not have a sticking fault.

3. The method according to claim 1, characterized in that, The method further includes: When the first switch is open and the second switch is closed, insulation detection is respectively performed on the first charging terminal and the second charging terminal; If the insulation impedance of the first charging terminal is less than the first threshold and the insulation impedance of the second charging terminal is less than the first threshold, it is determined that the first switch has a sticking fault.

4. The method according to claim 3, wherein: If the insulation impedance of the first charging terminal is greater than or equal to the first threshold and the insulation impedance of the second charging terminal is greater than or equal to the first threshold, it is determined that the first switch does not have a sticking fault; If the insulation impedance of the first charging terminal is greater than or equal to the first threshold and the insulation impedance of the second charging terminal is less than the first threshold, it is determined that the first switch does not have a sticking fault.

5. The method according to any one of claims 1 to 4, characterized in that Before closing the first switch, the method further includes: A first vehicle accesses the first charging terminal.

6. A controller of a charging pile, characterized in that, The charging pile includes a first power module, a second power module, a third power module, a first charging terminal, a second charging terminal, a first switch, a second switch, and the controller. The controller includes: A control circuit, configured to trigger insulation detection on the first charging terminal and the second charging terminal respectively when the first switch and the second switch are disconnected. The first charging terminal is connected to the first power module, and the second charging terminal is connected to the second power module. The first switch is used to connect the first charging terminal to the third power module, and the second switch is used to connect the second charging terminal to the third power module. The third power module is a shared power module. Wherein, the insulation impedance of the first charging terminal is greater than or equal to a first threshold, and the insulation impedance of the second charging terminal is greater than or equal to the first threshold; The control circuit is further configured to trigger insulation detection on the first charging terminal and the second charging terminal respectively when the first switch is closed; A processing circuit, configured to determine that the second switch has a sticking fault if the insulation impedance of the first charging terminal is less than the first threshold and the insulation impedance of the second charging terminal is less than the first threshold.

7. The controller according to claim 6, characterized in that The processing circuit is further configured to: Determine that the second switch does not have a sticking fault if the insulation impedance of the first charging terminal is less than the first threshold and the insulation impedance of the second charging terminal is greater than or equal to the first threshold; Determine that the second switch does not have a sticking fault if the insulation impedance of the first charging terminal is greater than or equal to the first threshold and the insulation impedance of the second charging terminal is greater than or equal to the first threshold.

8. The controller according to claim 6, wherein The control circuit is further configured to trigger insulation detection on the first charging terminal and the second charging terminal respectively when the first switch is disconnected and the second switch is closed; The processing circuit is further configured to determine that the first switch has a sticking fault if the insulation impedance of the first charging terminal is less than the first threshold and the insulation impedance of the second charging terminal is less than the first threshold.

9. The controller according to claim 8, wherein, The processing circuit is further configured to: Determine that the first switch does not have a sticking fault if the insulation impedance of the first charging terminal is greater than or equal to the first threshold and the insulation impedance of the second charging terminal is greater than or equal to the first threshold; Determine that the first switch does not have a sticking fault if the insulation impedance of the first charging terminal is greater than or equal to the first threshold and the insulation impedance of the second charging terminal is less than the first threshold.

10. The controller according to any one of claims 6 to 9, wherein The control circuit is further configured to sense that a first vehicle is connected to the first charging terminal.

11. A charging pile, characterized in that, Comprising: A first power module, a second power module, a third power module, a first charging terminal, a second charging terminal, a first switch, a second switch, and a controller; The controller is configured to trigger insulation detection for the first charging terminal and the second charging terminal respectively when the first switch and the second switch are disconnected. The first charging terminal is connected to the first power module, the second charging terminal is connected to the second power module, and the third power module is a shared power module. The first switch is used to connect the first charging terminal to the third power module, and the second switch is used to connect the second charging terminal to the third power module. Wherein, the insulation impedance of the first charging terminal is greater than or equal to a first threshold, and the insulation impedance of the second charging terminal is greater than or equal to the first threshold; The controller is further configured to trigger insulation detection for the first charging terminal and the second charging terminal respectively when the first switch is closed; The controller is further configured to determine that the second switch has a sticking fault if the insulation impedance of the first charging terminal is less than the first threshold and the insulation impedance of the second charging terminal is less than the first threshold.

12. The charging pile according to claim 11, characterized in that, The controller is further configured to: Determine that the second switch does not have a sticking fault if the insulation impedance of the first charging terminal is less than the first threshold and the insulation impedance of the second charging terminal is greater than or equal to the first threshold; Determine that the second switch does not have a sticking fault if the insulation impedance of the first charging terminal is greater than or equal to the first threshold and the insulation impedance of the second charging terminal is greater than or equal to the first threshold.

13. The charging pile according to claim 11, wherein, The controller is further configured to: Trigger insulation detection for the first charging terminal and the second charging terminal respectively when the first switch is disconnected and the second switch is closed; Determine that the first switch has a sticking fault if the insulation impedance of the first charging terminal is less than the first threshold and the insulation impedance of the second charging terminal is less than the first threshold.

14. The charging pile according to claim 13, characterized in that, The controller is further configured to: Determine that the first switch does not have a sticking fault if the insulation impedance of the first charging terminal is greater than or equal to the first threshold and the insulation impedance of the second charging terminal is greater than or equal to the first threshold; Determine that the first switch does not have a sticking fault if the insulation impedance of the first charging terminal is greater than or equal to the first threshold and the insulation impedance of the second charging terminal is less than the first threshold.

15. The charging pile according to any one of claims 11 to 14, wherein The controller is further configured to sense that a first vehicle is connected to the first charging terminal.

16. A charging device, characterized in that, Comprising: A processor and a transceiver, the transceiver is configured to receive computer code or instructions and transmit them to the processor, and the processor runs the computer code or instructions to implement the method according to any one of claims 1 to 5.

17. A computer-readable storage medium, characterized in that, Comprising: A computer program is stored in the computer-readable storage medium; When the computer program runs on a computer or a processor, the computer or the processor is caused to execute the method according to any one of claims 1 to 5.

18. A computer program product, characterized in that, Comprising a computer program which, when executed, causes the method according to any one of claims 1 to 5 to be implemented.

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