A vehicle charger and an over-temperature protection method and device thereof

Abstract

The application discloses a vehicle charger and an over-temperature protection method and device thereof. The over-temperature protection method comprises the following steps: determining a count value of a current off frequency of a temperature control switch after the temperature control switch is powered on; judging whether the count value of the current off frequency is greater than or equal to a preset frequency; and controlling a prompter to give an alarm and controlling a relay to be in an off state when the count value of the current off frequency is greater than or equal to the preset frequency. By using the above technical scheme, when the temperature control switch is continuously turned off due to the over-high temperature of a three-hole plug, the relay can be timely turned off, the accurate detection of the high-temperature abnormal fault of the vehicle charger is realized, the frequent on / off of the temperature control switch is avoided, the sensitivity of the temperature control switch is affected, the vehicle charger is protected from being damaged easily, the service life of the vehicle charger is prolonged, the user can be timely reminded to detect or replace the three-hole plug, the socket and the vehicle charger, and the charging efficiency of the vehicle is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle chargers, in particular to a vehicle charger and an over-temperature protection method and device thereof. BACKGROUND

[0002] With the development of science and technology, new energy vehicles that can achieve "zero emissions" have appeared, which can cope with the increasingly serious environmental and energy crises around the world, and are an important means to solve the contradiction between current resource scarcity and economic development. New energy vehicles can be directly charged by household power supply network through mode two chargers, which provides great charging convenience for users using new energy vehicles.

[0003] However, due to the uneven quality of the sockets of the household power supply panel, the connection between the socket and the plug is not tight, and there are foreign matter / over-oxidation on the surface of the socket / plug blade, which will cause a large contact resistance at the plug socket connection, and then generate a lot of heat, which will cause a lot of potential risks, such as deformation and melting of the plug, fire risk, etc. Therefore, a charging method and device that can accurately monitor the high temperature fault of the plug is needed. SUMMARY

[0004] The present application provides a vehicle charger and an over-temperature protection method and device thereof to accurately monitor the high temperature fault of the plug.

[0005] According to an aspect of the present application, an over-temperature protection method of a vehicle charger is provided, the vehicle charger comprising a three-pin plug, a charging cable, a control box and a charging gun, a temperature control switch is arranged in the three-pin plug, the blades of the three-pin plug are connected to the charging cable through the temperature control switch, and the charging cable is electrically connected to the charging gun; the control box is arranged in the charging cable; the control box comprises a relay and a prompter, the input end of the relay is electrically connected to the temperature control switch through the charging cable, the output end of the relay is electrically connected to the charging gun through the charging cable, and the over-temperature protection method comprises:

[0006] After the temperature control switch is powered on, the count value of the current number of times of disconnection of the temperature control switch is determined;

[0007] It is judged whether the count value of the current number of times of disconnection is greater than or equal to a preset number of times;

[0008] If yes, the prompter is controlled to give a warning, and the relay is controlled to be in a disconnected state.

[0009] Optionally, it further comprises:

[0010] If the count value of the current off times is less than the preset times, the relay is controlled to be in the on state.

[0011] Optionally, after the temperature control switch is powered on, the count value of the current off times of the temperature control switch is determined, including:

[0012] The charging time of the last charging and the count value of the off times of the temperature control switch during the last charging are obtained.

[0013] It is judged whether the charging time of the last charging is in a preset time range.

[0014] If yes, the count value of the off times of the temperature control switch during the last charging is added by one as the count value of the current off times.

[0015] Optionally, the preset time range includes a first preset time range and a second preset time range.

[0016] It is judged whether the charging time of the last charging is in a preset time range, including:

[0017] When the count value of the off times of the temperature control switch during the last charging is zero, it is judged whether the charging time of the last charging is in the first preset time range.

[0018] When the count value of the off times of the temperature control switch during the last charging is not zero, it is judged whether the charging time of the last charging is in the second preset time range.

[0019] Optionally, after the temperature control switch is powered on, the count value of the current off times of the temperature control switch is determined, further including:

[0020] If the charging time of the last charging is not in the preset time range, the count value of the current off times is set to zero.

[0021] Optionally, after the prompter is controlled to give an alarm and the relay is controlled to be in the off state, further including:

[0022] The count value of the current off times is set to zero.

[0023] According to another aspect of the present application, there is provided an over-temperature protection device of a vehicle charger, the vehicle charger comprising a three-pin plug, a charging cable, a control box and a charging gun, a temperature control switch being arranged in the three-pin plug, a blade of the three-pin plug being connected to the charging cable through the temperature control switch and being electrically connected to the charging gun through the charging cable; the control box being arranged in the charging cable; the control box comprising a relay and a prompter, an input end of the relay being electrically connected to the temperature control switch through the charging cable, an output end of the relay being electrically connected to the charging gun through the charging cable; the over-temperature protection device comprising:

[0024] a count value determination module configured to determine a count value of a current number of times of disconnection of the temperature control switch after the temperature control switch is powered on;

[0025] a judgment module configured to judge whether the count value of the current number of times of disconnection is greater than or equal to a preset number of times;

[0026] a warning module configured to control the prompter to give a warning reminder and control the relay to be in a disconnected state when the count value of the current number of times of disconnection is greater than or equal to the preset number of times.

[0027] According to another aspect of the present application, there is provided a vehicle charger comprising a three-pin plug, a charging cable, a control box and a charging gun, a temperature control switch being arranged in the three-pin plug, a blade of the three-pin plug being connected to the charging cable through the temperature control switch and being electrically connected to the charging gun through the charging cable;

[0028] the control box being arranged in the charging cable; the control box comprising a relay and a prompter, an input end of the relay being electrically connected to the temperature control switch through the charging cable, an output end of the relay being electrically connected to the charging gun through the charging cable; the control box being configured to control working states of the relay and the prompter; the prompter being configured to give a warning reminder;

[0029] the control box further comprising an over-temperature protection device of the vehicle charger according to any one of the embodiments of the present application, the over-temperature protection device of the vehicle charger being configured to execute the over-temperature protection method of the vehicle charger according to any one of the embodiments of the present application.

[0030] Optionally, the blade of the three-pin plug comprises a live wire blade, a zero wire blade and a ground wire blade; the temperature control switch comprises a first temperature control switch and a second temperature control switch;

[0031] the live wire blade comprising a live wire heat dissipation area; the live wire heat dissipation area being located in an injection molding part of the three-pin plug; the zero wire blade comprising a zero wire heat dissipation area; the zero wire heat dissipation area being located in the injection molding part of the three-pin plug;

[0032] The first temperature control switch and the second temperature control switch are located in the injection molding part of the three-hole plug; the live wire heat dissipation area is apart from the first temperature control switch by a first preset value; and the zero line heat dissipation area is apart from the second temperature control switch by a second preset value.

[0033] Optionally, the live wire insert piece further comprises a live wire conductive area; and the insert piece width of the live wire heat dissipation area is greater than the insert piece width of the live wire conductive area.

[0034] The zero line insert piece further comprises a zero line conductive area; and the insert piece width of the zero line heat dissipation area is greater than the insert piece width of the zero line conductive area.

[0035] The technical scheme of the embodiment of the present application can determine the counting value of the current disconnection times of the temperature control switch after the temperature control switch is powered on, can timely control the relay to be disconnected when the temperature control switch is continuously disconnected due to the over-high temperature of the three-hole plug, and can control the prompter to give an alarm, so as to accurately detect the high-temperature abnormal fault of the vehicle charger, to disconnect the charging circuit when the vehicle charger has a high-temperature abnormal fault, to make the vehicle charger stop charging the vehicle, to avoid the frequent on / off of the temperature control switch, to affect the sensitivity of the temperature control switch, to protect the vehicle charger from being damaged, and to prolong the service life of the vehicle charger; meanwhile, the user can be timely reminded by the prompter that the charging is abnormal, to remind the user to detect or replace the vehicle charger, and to improve the efficiency of the vehicle charging.

[0036] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort.

[0038] Figure 1 A structural schematic diagram of a vehicle charger is provided for the first embodiment of the present application;

[0039] Figure 2 A structural schematic diagram of a vehicle charger is provided for the second embodiment of the present application;

[0040] Figure 3 A structural schematic diagram of a three-hole plug is provided for the second embodiment of the present application;

[0041] Figure 4The structure diagram of a first temperature control switch provided for the second embodiment of the present application Figure 3 The enlarged view of the middle region 101

[0042] Figure 5 The structure diagram of a first temperature control switch provided for the second embodiment of the present application

[0043] Figure 6 The structure diagram of a first temperature control switch provided for the second embodiment of the present application

[0044] Figure 7 The flow chart of the over-temperature protection method of the vehicle charger provided for the third embodiment of the present application

[0045] Figure 8 The flow chart of the over-temperature protection method of the vehicle charger provided for the fourth embodiment of the present application

[0046] Figure 9 The flow chart of the over-temperature protection method of the vehicle charger provided for the fifth embodiment of the present application

[0047] Figure 10 The flow chart of the over-temperature protection method of the vehicle charger provided for the sixth embodiment of the present application

[0048] Figure 11 The structure diagram of the over-temperature protection device of the vehicle charger provided for the seventh embodiment of the present application DETAILED DESCRIPTION

[0049] In order to make the personnel in the art better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by the personnel in the art without creative labor should belong to the protection scope of the present application.

[0050] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to the clearly listed steps or units, but can include other steps or units not clearly listed or inherent to the process, method, product or device.

[0051] Embodiment One

[0052] Figure 1 A structural schematic diagram of a vehicle charger is provided for Embodiment One of the present application. Referring to Figure 1 , the vehicle charger comprises a three-pin plug 100, a charging cable 200, a control box 300 and a charging gun 400. The three-pin plug 100 is provided with a temperature control switch 110, the prongs of the three-pin plug 100 are connected to the charging cable 200 through the temperature control switch 110, and the three-pin plug 100 is electrically connected to the charging gun 400 through the charging cable 200. The control box 300 is arranged in the charging cable 200, the control box 300 comprises a relay 310 and a prompter 320, the input end of the relay 310 is electrically connected to the temperature control switch 110 through the charging cable 200, and the output end of the relay 310 is electrically connected to the charging gun 400 through the charging cable 200. The control box 300 is used to control the working state of the relay 310 and the prompter 320, and the prompter 320 is used for warning. The control box 300 further comprises an over-temperature protection device of the vehicle charger provided by the present application, and the over-temperature protection device of the vehicle charger is used to execute the over-temperature protection method of the vehicle charger provided by any embodiment of the present application.

[0053] For example, the vehicle charger comprises a live wire, a zero wire and a ground wire, the charging cable 200 comprises a live wire cable 210, a zero wire cable 220 and a ground wire cable 230, when the vehicle charger is working, the live wire cable 210 and the zero wire cable 220 can form a charging loop, and the ground wire cable 230 is used to prevent the vehicle charger and / or the vehicle from being electrified. The control box 300 is arranged on the charging cable, and the control box 300 can control the on / off of the relay 310, thereby controlling the on / off of the charging loop. When the three-pin plug 100 of the vehicle charger is inserted into the socket, and the charging gun 400 is inserted into the charging port of the vehicle, the vehicle charger starts to work, when the control box 300 controls the relay 310 to be turned on, the charging loop is turned on, and there is a large current transmission in the live wire cable 210 and the zero wire cable 220.

[0054] The temperature control switch 110 arranged in the three-hole plug 100 can detect whether the temperature of the three-hole plug 100 is abnormal. If the socket and / or the three-hole plug is old, poorly connected, and has poor heat dissipation, the temperature of the three-hole plug 100 may be too high under the action of current. The temperature control switch 110 can be turned off when the temperature of the three-hole plug 100 is too high, so that the vehicle charger is powered off, the charging is stopped, and dangerous things such as thermal deformation and fire of the three-hole plug 100 are avoided. After the temperature of the three-hole plug 100 decreases, the temperature control switch 110 is turned on. If the three-hole plug 100 of the vehicle charger is still in the state of being inserted into the socket, the vehicle charger is powered on, the control box 300 of the vehicle charger is also powered on, and the over-temperature protection device of the vehicle charger provided by the embodiment of the application arranged in the control box 300 can execute the over-temperature protection method of the vehicle charger provided by any embodiment of the application to protect the vehicle charger from being damaged.

[0055] According to the embodiment of the application, the temperature control switch arranged in the three-hole plug can be turned off in time when the temperature of the three-hole plug is too high, so that dangerous things such as thermal deformation and fire of the three-hole plug are avoided. The over-temperature protection device of the vehicle charger arranged in the control box can execute the over-temperature protection method of the vehicle charger provided by any embodiment of the application, and has the corresponding function modules and beneficial effects of the execution method.

[0056] Embodiment Two

[0057] Figure 2 A structural schematic diagram of a vehicle charger provided by Embodiment Two of the application, Figure 3 A structural schematic diagram of a three-hole plug provided by Embodiment Two of the application, Figure 4 A structural schematic diagram of a control box provided by Embodiment Two of the application, Figure 3 An enlarged view of the middle area 101, Figure 5 A structural schematic diagram of a first temperature control switch provided by Embodiment Two of the application, Figure 6 A structural schematic diagram of a live plug provided by Embodiment Two of the application.

[0058] Reference Figures 2-6The blade of the three-hole plug 110 includes a live blade 120, a zero blade 130, and a ground blade 140. In this case, the temperature control switch 110 can include a first temperature control switch 111 and a second temperature control switch 112. The live blade 120 includes a live heat dissipation area 121 located in the injection molding part of the three-hole plug 110. The zero blade 130 includes a zero heat dissipation area (not shown in the figure) located in the injection molding part of the three-hole plug. The first temperature control switch 111 and the second temperature control switch 112 are both located in the injection molding part of the three-hole plug 110. The live heat dissipation area 121 is separated from the first temperature control switch 111 by a first preset distance d1. The zero heat dissipation area is separated from the second temperature control switch by a second preset distance (not shown in the figure). It can be understood that in the structure of the three-hole plug 100, the zero blade 130 can be symmetrically arranged with the live blade 120, and the second temperature control switch 112 can be symmetrically arranged with the first temperature control switch 111. The specific structure of the zero blade 130 and the second temperature control switch 112 will not be repeated in the embodiments of the present application.

[0059] For example, when the vehicle charger charges the vehicle, the current in the live cable 210 and the zero cable 220 is large, and the live blade 120 and the zero blade 130 have the risk of overheating. The live blade 120 includes a live conductive area 122 and a live heat dissipation area 121. The blade width of the live heat dissipation area 121 is greater than the blade width of the live conductive area 122, which is conducive to heat dissipation and improves the heat dissipation performance. The zero blade 130 also includes a zero conductive area and a zero heat dissipation area (not shown in the figure). The blade width of the zero heat dissipation area is greater than the blade width of the zero conductive area, which is conducive to heat dissipation and improves the heat dissipation performance.

[0060] The first temperature control switch 111 is arranged at the live blade 120 and one end of the first temperature control switch 111 is electrically connected to the live blade 120 through a first connecting line 1101, and the other end is electrically connected to the live cable 210 through a second connecting line. When the live blade 120 abnormally heats, the first temperature control switch 111 can be disconnected in time to cut off the charging circuit and avoid melting of the injection molding material adjacent to the live blade 120. The second temperature control switch 112 is arranged at the zero blade 130 and one end of the second temperature control switch 112 is electrically connected to the zero blade 130, and the other end is electrically connected to the zero cable. When the zero blade 130 abnormally heats, the second temperature control switch 112 can be disconnected in time to cut off the charging circuit and avoid melting of the injection molding material adjacent to the zero blade 130. By selecting appropriate first temperature control switch 111 and second temperature control switch 112, the first temperature control switch 111 and the second temperature control switch 112 have appropriate temperature thresholds, and problems such as temperature being too high and reaction being sluggish do not occur. Also, problems such as temperature being too low and being overly sensitive do not occur.

[0061] The heat-affected surface 1103 of the first temperature control switch 111 is arranged opposite to the live wire heat dissipation area 121, and the first interval d1 between the heat-affected surface 1103 of the first temperature control switch 111 and the live wire heat dissipation area 121 is filled with injection material. The first interval d1 can be appropriately reduced, so that the heat-affected surface 1103 of the first temperature control switch 111 is closer to the live wire heat dissipation area 121, the sensitivity of the first temperature control switch 111 is improved, and the first temperature control switch 111 can be turned off in time when the temperature of the live wire heat dissipation area 121 is too high, so as to avoid dangerous situations such as thermal deformation and fire of the three-eye plug 100. The first interval d2 can be appropriately increased, so as to reduce the sensitivity of the first temperature control switch 111, and avoid false detection of the vehicle charger in a high-temperature environment. The first interval d1 can be reasonably controlled, so as to ensure the sensitivity of the first temperature control switch 111, and prevent the first temperature control switch 111 from being false detected when the vehicle charger is charged in a high-temperature environment. The heat-affected surface of the second temperature control switch 112 is arranged opposite to the zero line heat dissipation area (not shown in the figure), and the second interval between the heat-affected surface of the second temperature control switch 112 and the zero line heat dissipation area is filled with injection material. The second interval can be reasonably controlled, so as to ensure the sensitivity of the second temperature control switch 112, and prevent the second temperature control switch 112 from being false detected when the vehicle charger is charged in a high-temperature environment.

[0062] In the embodiment of the present application, the live wire heat dissipation area is arranged on the live wire plug, and the zero line heat dissipation area is arranged on the zero line plug, which is beneficial to heat dissipation and improves the heat conductivity of the three-eye plug. The first temperature control switch is arranged on the live wire plug, and the second temperature control switch is arranged on the zero line plug, so that the temperature control switch can accurately perceive and quickly respond in the case of abnormal heating. The temperature threshold of the first temperature control switch, the temperature threshold of the second temperature control switch, the first interval and the second interval can be reasonably controlled, so as to ensure the sensitivity of the temperature control switch, and prevent the temperature control switch from being false detected when the vehicle charger is charged in a high-temperature environment.

[0063] Optionally, the control box 300 further comprises a control module 330 and a storage module 340. The control module 330 can be used to acquire electrical information and control the working state of the relay 310 and the prompter 320. The storage module 340 can be used to store charging information. The charging information includes but is not limited to charging time, charging frequency and the like.

[0064] Optionally, the prompter 320 comprises a power lamp, a charging lamp and a fault lamp (not shown in the figure). The power lamp can be a green lamp, and the power lamp is lit when the vehicle charger is powered on. The charging lamp can be a green lamp, and the charging lamp is lit when the vehicle charger is charging the vehicle. The fault lamp can be a red lamp, and the fault lamp flashes at different frequencies to indicate different faults of the vehicle charger.

[0065] Optionally, the control module 330 comprises a control circuit and / or a control program for executing the over-temperature protection method of the vehicle charger according to any of the embodiments of the present application.

[0066] It can be understood that the control module 330, the storage module 340, the prompter 320, etc. can all be electrically connected with the three-pin plug 100 through the charging cable 200 (not shown in the figure), and when the three-pin plug 100 is plugged into the socket, as long as the condition for turning on the temperature control switch is met, the control box 300 is still powered on even if the charging gun 400 is not plugged into the charging port of the vehicle or the relay 310 is in the off state, at this time, the control box 300 can work.

[0067] Embodiment Three

[0068] Figure 7 A flowchart of an over-temperature protection method of a vehicle charger according to Embodiment Three of the present application is provided, which can be applicable to the case where the three-pin plug of the vehicle charger fails due to high temperature, and the method can be executed by an over-temperature protection device of the vehicle charger, which can be realized in the form of hardware and / or software, and can be configured in the control box of the vehicle charger. As shown in Figure 7 the method comprises:

[0069] S1001, determining the count value of the current number of times of disconnection of the temperature control switch after the temperature control switch is powered on.

[0070] The count value of the current number of times of disconnection of the temperature control switch refers to the count value of the number of times of disconnection of the temperature control switch in this charging, and the count value of the number of times of disconnection of the temperature control switch refers to the number of times of continuous disconnection of the temperature control switch due to the excessively high temperature of the three-pin plug. There are various cases of power-on of the temperature control switch, for example, the temperature control switch is in the on state when the three-pin plug is just plugged into the socket, and the temperature control switch is powered on; or the three-pin plug is always in the state of being plugged into the socket, and the temperature control switch is disconnected due to the excessively high temperature of the three-pin plug, and the temperature control switch is powered on after the temperature decreases.

[0071] It can be understood that the present charging refers to the present power-on of the temperature control switch or the present power-on of the control box, and is irrelevant to the on / off of the relay. Exemplarily, after the present power-on of the temperature control switch, the number of times of continuous disconnection of the temperature control switch due to the excessively high temperature of the three-pin plug before this moment can be counted, at this time, the temperature control switch has not been disconnected after the present power-on, and it is not necessary to consider whether the temperature control switch will be disconnected after the present power-on of the temperature control switch.

[0072] S1002, judging whether the count value of the current number of times of disconnection is greater than or equal to the preset number of times. If yes, S1003 is executed; if no, S1004 is executed.

[0073] Specifically, it is judged whether the number of times that the temperature control switch is continuously disconnected due to the temperature of the three-pin plug being too high reaches a preset number of times. The preset number of times can be set according to actual conditions. For ease of description, the preset number of times is taken as 2 in the embodiment of the application for example. If the count value of the current number of times of disconnection is greater than or equal to 2, it is indicated that the number of times that the temperature control switch is disconnected due to the temperature of the three-pin plug being too high has reached two times, and the vehicle charger is likely to have an abnormal high-temperature fault. If the count value of the current number of times of disconnection is less than 2, it is indicated that the temperature control switch has not appeared the condition of being disconnected due to the temperature being too high, or has appeared the condition of being disconnected due to the temperature being too high only once, and it is not enough to prove that the vehicle charger has an abnormal high-temperature fault. The high-temperature fault includes but is not limited to the three-pin plug fault, the charging cable fault, the socket fault, the poor connection between the three-pin plug and the socket, and the like.

[0074] S1003, control the prompter to give a warning and control the relay to be in a disconnected state.

[0075] Specifically, when the count value of the current number of times of disconnection reaches the preset number of times, the prompter is controlled to work, reminding the user that the vehicle charger has an abnormal high-temperature fault, and the relay is controlled to be in a disconnected state, so that the charging circuit is disconnected, thereby avoiding the current in the charging circuit causing the temperature of the three-pin plug to be too high and leading to the temperature control switch being frequently turned on / off.

[0076] S1004, control the relay to be in a connected state.

[0077] Specifically, when the count value of the current number of times of disconnection does not reach the preset number of times, the relay is controlled to be in a connected state, the charging circuit can be connected, and the vehicle charger can charge the vehicle.

[0078] Specifically, the three-pin plug is in a state of being inserted into the socket. After the temperature control switch is powered on, the control box is powered on, and the control box can start to work. According to the charging information recorded by the control box, the number of times that the temperature control switch is continuously disconnected due to the temperature of the three-pin plug being too high before this moment can be determined. If the number of times that the temperature control switch is continuously disconnected due to the temperature of the three-pin plug being too high before this moment reaches two times, it is indicated that the vehicle charger has an abnormal high-temperature fault. The relay is controlled to be disconnected or to remain in a disconnected state, thereby avoiding the temperature control switch being frequently turned on / off, affecting the sensitivity of the temperature control switch and the service life of the vehicle charger. At the same time, the fault light of the prompter is turned on to remind the user that the vehicle charger has a fault, so that the user can check / repair the fault reason of the vehicle charger or replace the vehicle charger in time. If the number of times that the temperature control switch is continuously disconnected due to the temperature of the three-pin plug being too high before this moment is 0 or 1, the occasional temperature abnormality is likely to be caused by the fluctuation of the household power supply, and it is not enough to prove that the vehicle charger has an abnormal high-temperature fault. After checking that the vehicle charger has no other faults, the relay is controlled to be closed, the charging circuit is connected, the vehicle charger charges the vehicle, and at the same time, the charging light of the prompter is turned on.

[0079] It can be understood that after the temperature control switch is powered on, the charging circuit is initially not conductive, the control box is powered on and works first, and the relay is controlled to be closed after it is determined that the temperature control switch is not disconnected for more than twice due to the temperature of the three-hole plug being too high, so that the charging circuit is conductive.

[0080] In the embodiment of the application, by determining the counting value of the current disconnection times of the temperature control switch after the temperature control switch is powered on, the relay can be controlled to be disconnected in time when the temperature control switch is disconnected continuously due to the temperature of the three-hole plug being too high, and the prompter can be controlled to give an alarm, so that accurate detection of the high-temperature abnormal fault of the vehicle charger is realized. When the vehicle charger has a high-temperature abnormal fault, the charging circuit can be disconnected, so that the vehicle charger stops charging the vehicle, the temperature control switch is prevented from being frequently turned on / off, the sensitivity of the temperature control switch is protected, the vehicle charger is prevented from being damaged easily, and the service life of the vehicle charger is prolonged. At the same time, the user can be reminded in time by the prompter that the charging is abnormal, so that the user can detect or replace the vehicle charger, and the efficiency of vehicle charging is improved.

[0081] Optionally, after the prompter gives an alarm and the relay is in the disconnected state, the counting value of the current disconnection times is reset to zero. For example, after the vehicle controller has a high-temperature abnormal fault, the counting value of the current disconnection times is reset to zero, so that the next time the vehicle is charged, the number of times that the temperature control switch is disconnected continuously due to the temperature of the three-hole plug being too high can be counted from zero, and the over-temperature protection device can determine that the vehicle charger has a high-temperature abnormal fault after the temperature control switch is disconnected continuously twice. On the other hand, after the vehicle controller has a high-temperature abnormal fault, the prompter gives an alarm, the user will generally check / repair the fault reason of the vehicle charger or replace the vehicle charger, and the counting value of the current disconnection times is reset to zero, so that whether the repaired / replaced vehicle charger has a high-temperature abnormal fault can be determined.

[0082] Embodiment Four

[0083] Figure 8 The flowchart of the over-temperature protection method of the vehicle charger provided in Embodiment Four of the application is compared with the above-mentioned embodiments. The embodiment specifically refines the step of determining the counting value of the current disconnection times of the temperature control switch after the temperature control switch is powered on. As shown in FIG. 8, the method comprises the following steps. Figure 8

[0084] S2001, after the temperature control switch is powered on, the charging time of the last charging and the counting value of the disconnection times of the temperature control switch in the last charging are obtained.

[0085] ​S2002, determine whether the charging time at the last charging is in a preset time range. If yes, execute S2003.

[0086] S2003, add one to the count value of the disconnection times of the temperature control switch at the last charging as the count value of the current disconnection times.

[0087] S2004, determine whether the count value of the current disconnection times is greater than or equal to a preset number of times. If yes, execute S2005; if no, execute S2006.

[0088] S2005, control the prompter to give an alarm and control the relay to be in the off state.

[0089] S2006, control the relay to be in the on state.

[0090] The last charging refers to the last time when the temperature control switch is powered on or the last time when the control box is powered on. The charging time at the last charging refers to the time period when the charging circuit is on at the last time when the temperature control switch is powered on or the last time when the control card is powered on, i.e. the time period when the vehicle charger charges the vehicle at the last time when the temperature control switch is powered on or the last time when the control box is powered on, which can be zero or non-zero. The preset time range refers to the time period required for the temperature of the three-pin plug to rise to the temperature threshold of the temperature control switch after the temperature control switch is powered on for the vehicle charger with high-temperature abnormal fault. If the time when the vehicle charger charges the vehicle is within the preset time range, it means that the temperature of the three-pin plug reaches the temperature threshold at that time, and the temperature control switch is disconnected due to the excessively high temperature of the three-pin plug during the charging process. If the time when the vehicle charger charges the vehicle is not within the preset time range, it means that the temperature control switch is not disconnected due to the excessively high temperature of the three-pin plug.

[0091] For example, when the three-eye plug is in the state of being inserted into the socket, after the temperature control switch is powered on, the control box is powered on, and the control box can start to work. The control box can store the time point at which the vehicle charger starts to charge the vehicle and the time point at which the vehicle charger stops to charge the vehicle during the last charging, and further obtain the time period during which the vehicle charger charges the vehicle during the last charging. At the same time of obtaining the time period during which the vehicle charger charges the vehicle during the last charging, the counting value of the number of times of disconnection of the temperature control switch confirmed during the last charging is also obtained. The counting value of the number of times of disconnection of the temperature control switch confirmed during the last charging is the number of times of continuous disconnection of the temperature control switch due to the excessively high temperature of the three-eye plug before the last charging. The counting value of the number of times of disconnection of the temperature control switch confirmed during the last charging is zero or a non-zero value smaller than the preset number of times. If the time period during which the vehicle charger charges the vehicle during the last charging is within the preset time range, it indicates that the temperature control switch is disconnected due to the excessively high temperature of the three-eye plug after the temperature control switch is powered on during the last charging. Therefore, the counting value of the number of times of disconnection of the temperature control switch confirmed during the last charging is increased by one, and the counting value of the number of times of disconnection of the temperature control switch confirmed during the current charging is obtained. For example, if the preset number of times is 2, if the counting value of the number of times of disconnection of the temperature control switch confirmed during the current charging is 1, and the time period during which the vehicle charger charges the vehicle during the current charging is within the preset time range, the counting value of the number of times of disconnection of the temperature control switch confirmed during the current charging is increased by one as the counting value of the number of times of disconnection of the temperature control switch confirmed during the next charging. If the counting value of the number of times of disconnection of the temperature control switch confirmed during the current charging is 2, the relay is controlled to be disconnected or the state of the relay is controlled to be kept disconnected, and the fault light of the prompter is controlled to be turned on.

[0092] In the embodiment of the present application, the charging time during the last charging is obtained, and whether the temperature control switch is disconnected due to the high temperature during the last charging is confirmed by judging whether the charging time during the last charging is within the preset time range. When the time range during which the temperature control switch is disconnected during the last charging is within the preset time range, the counting value of the number of times of disconnection of the temperature control switch during the last charging is increased by one as the counting value of the current number of times of disconnection. The number of times of continuous disconnection of the temperature control switch due to the high temperature can be counted, and when the number of times of continuous disconnection of the temperature control switch reaches the preset number of times, it is confirmed that the vehicle charger has the abnormal fault due to the high temperature.

[0093] Embodiment five

[0094] Figure 9 A flowchart of a method for over-temperature protection of a vehicle charger is provided for the fifth embodiment of the present application. Compared with the above-mentioned embodiments, the present embodiment specifically adds the content that the preset time range includes a first preset time range and a second preset time range. As shown in Figure 9 the method includes:

[0095] S3001, obtaining the charging time of the last charging and the count value of the number of times of turning off the temperature control switch during the last charging after the temperature control switch is powered on.

[0096] S3002, when the count value of the number of times of turning off the temperature control switch during the last charging is zero, determining whether the charging time of the last charging is within a first preset time range. If yes, executing S3004.

[0097] S3003, when the count value of the number of times of turning off the temperature control switch during the last charging is not zero, determining whether the charging time of the last charging is within a second preset time range. If yes, executing S3004.

[0098] S3004, adding one to the count value of the number of times of turning off the temperature control switch during the last charging to obtain the count value of the current number of times of turning off the temperature control switch.

[0099] S3005, determining whether the count value of the current number of times of turning off the temperature control switch is greater than or equal to a preset number of times. If yes, executing S3006; if not, executing S3007.

[0100] S3006, controlling the prompter to give a warning and controlling the relay to be in an off state.

[0101] S3007, controlling the relay to be in an on state.

[0102] For example, due to the material properties, the time for the three-pin plug to be heated to the temperature threshold of the temperature control switch for the first time after the charging circuit is turned on is different from the time for the three-pin plug to be heated to the temperature threshold of the temperature control switch for the second time. For example, the time for the three-pin plug to be heated to the temperature threshold of the temperature control switch for the first time is 60s-1380s, which can be regarded as the first preset time range, and the time for the three-pin plug to be heated to the temperature threshold of the temperature control switch for the second time is 30s-980s, which can be regarded as the second preset time range. If the count value of the number of times of turning off the temperature control switch during the last charging is zero, it indicates that the temperature control switch has not been turned off due to the high temperature of the three-pin plug before the last charging. Then, it is determined whether the charging time of the last charging is within the time range of 60s-1380s. If yes, it indicates that the temperature control switch is turned off due to the high temperature for the first time. If the count value of the number of times of turning off the temperature control switch during the last charging is not zero, it indicates that the temperature control switch has been turned off due to the high temperature of the three-pin plug before the last charging. Then, it is determined whether the charging time of the last charging is within the time range of 30s-980s. If yes, it indicates that the temperature control switch is turned off due to the high temperature for the second time.

[0103] The application can improve the accuracy of high-temperature abnormal fault detection and charging efficiency by judging whether the charging time during the last charging is in the first preset time range when the count value of the number of times of turning off the temperature control switch during the last charging is zero, and judging whether the charging time during the last charging is in the second preset time range when the count value of the number of times of turning off the temperature control switch during the last charging is not zero.

[0104] Embodiment six

[0105] Figure 10 The flowchart of the over-temperature protection method of the vehicle charger provided in the sixth embodiment of the application specifically adds the content that the preset time range includes the first preset time range and the second preset time range compared with the above-mentioned embodiments. As shown in the figure, the method comprises the following steps. Figure 10

[0106] S4001, obtaining the charging time during the last charging and the count value of the number of times of turning off the temperature control switch during the last charging after the temperature control switch is turned on.

[0107] S4002, judging whether the charging time during the last charging is in the preset time range. If yes, performing S4003; if no, performing S4004.

[0108] S4003, adding one to the count value of the number of times of turning off the temperature control switch during the last charging as the count value of the current number of times of turning off.

[0109] S4004, setting the count value of the current number of times of turning off to zero. Then S4007 can be directly performed.

[0110] S4005, judging whether the count value of the current number of times of turning off is greater than or equal to the preset number of times. If yes, performing S4006; if no, performing S4007.

[0111] S4006, controlling the prompter to give a warning and controlling the relay to be in the off state.

[0112] S4007, controlling the relay to be in the on state.

[0113] ​For example, if the charging time of the last charging is not in the preset time range, it can be that the charging time of the last charging is short, for example, 0s, or it can be that the charging time of the last charging is long, for example, 3000s. When the charging time of the last charging is 0s, it indicates that the charging circuit is not turned on after the last time the temperature control switch is powered on, and the power-off of the temperature control switch after the last time the temperature control switch is powered on is not caused by the high temperature of the three-pin plug. It can be caused by other faults, such as poor ground connection, relay sticking, and the like, and no high-temperature abnormal fault occurs. When the charging time of the last charging is 3000s, it indicates that the charging circuit is turned on after the last time the temperature control switch is powered on, and the time of the on is long, indicating that the vehicle charger is normal during the last charging and no high-temperature abnormal fault occurs. If no high-temperature abnormal fault occurs during the last charging, the count value of the current off times of the temperature control switch is set to zero during the current charging, and the number of continuous off times of the temperature control switch due to the high temperature of the three-pin plug during the next charging can be calculated from zero. After the count value of the current off times is set to zero, the relay can be directly controlled to be in the on state.

[0114] In the embodiment of the application, when the charging time of the last charging is not in the preset time range, the count value of the current off times is set to zero, so that the number of continuous off times of the temperature control switch due to the high temperature of the three-pin plug during the next charging can be calculated from zero. In this way, the situation that the temperature control switch is not continuously high-temperature off can not be calculated, and the high-temperature abnormal fault of the vehicle charger can be confirmed only when the number of continuous high-temperature off times of the temperature control switch reaches the preset number. The accuracy of high-temperature abnormal fault detection can be improved, and the charging efficiency can be improved.

[0115] Embodiment Seven

[0116] Figure 11 A structure schematic diagram of a vehicle charger over-temperature protection device provided by the embodiment seven of the application is shown in FIG. 7. Figure 11 As shown in the figure, the over-temperature protection device includes:

[0117] The count value determination module 510 is configured to determine the count value of the current off times of the temperature control switch after the temperature control switch is powered on.

[0118] The judgment module 520 is configured to judge whether the count value of the current off times is greater than or equal to the preset number.

[0119] The warning module 530 is configured to control the prompter to give a warning and alert when the count value of the current off times is greater than or equal to the preset number, and control the relay to be in the off state.

[0120] Optionally, the over-temperature protection device further includes:

[0121] The charging module 540 is configured to control the relay to be in the conducting state when the count value of the current disconnection times is less than the preset number of times.

[0122] The over-temperature protection device of the vehicle charger provided by the embodiments of the present application can execute the over-temperature protection method of the vehicle charger provided by any of the embodiments of the present application, and has the function modules and beneficial effects corresponding to the execution method.

[0123] It should be understood that the various forms of flow, components shown above can be reordered, added or deleted. For example, each step described in the present application can be executed in parallel, sequentially or in different order, and various component structures described in the present application can exist simultaneously or partially, as long as the desired results of the technical solutions of the present application can be achieved, which is not limited herein.

[0124] The above specific embodiments do not constitute a limitation on the protection scope of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent replacement and improvement within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A method of over-temperature protection for a vehicle charger, the method comprising: The vehicle charger comprises a three-pin plug, a charging cable, a control box and a charging gun, a temperature control switch is arranged in the three-pin plug, the plug of the three-pin plug is connected to the charging cable through the temperature control switch, and the charging cable is electrically connected to the charging gun; the control box is arranged in the charging cable; The control box comprises a relay and a prompter, the input end of the relay is electrically connected to the temperature control switch through the charging cable, the output end of the relay is electrically connected to the charging gun through the charging cable, and the over-temperature protection method comprises: After the temperature control switch is powered on, the count value of the current number of times of disconnection of the temperature control switch is determined; It is judged whether the count value of the current number of times of disconnection is greater than or equal to a preset number of times; If yes, the prompter is controlled to give an alarm, and the relay is controlled to be in a disconnected state; After the temperature control switch is powered on, the count value of the current number of times of disconnection of the temperature control switch is determined, which comprises: The charging time of the last charging and the count value of the number of times of disconnection of the temperature control switch during the last charging are obtained; It is judged whether the charging time of the last charging is within a preset time range; the preset time range refers to the time period required for the temperature of the three-pin plug to rise to the temperature threshold of the temperature control switch after the temperature control switch is powered on for the vehicle charger with high-temperature abnormal fault; If yes, the count value of the number of times of disconnection of the temperature control switch during the last charging is increased by one as the count value of the current number of times of disconnection.

2. The over-temperature protection method of a vehicle charger according to claim 1, characterized by, Further comprising: If the count value of the current number of times of disconnection is less than the preset number of times, the relay is controlled to be in a conducting state.

3. The over-temperature protection method of a vehicle charger according to claim 1, wherein The preset time range comprises a first preset time range and a second preset time range; It is judged whether the charging time of the last charging is within a preset time range, which comprises: When the count value of the number of times of disconnection of the temperature control switch during the last charging is zero, it is judged whether the charging time of the last charging is within the first preset time range; When the count value of the number of times of disconnection of the temperature control switch during the last charging is not zero, it is judged whether the charging time of the last charging is within the second preset time range.

4. The over-temperature protection method of a vehicle charger according to claim 1, characterized by, After the temperature control switch is powered on, the count value of the current number of times of disconnection of the temperature control switch is determined, which further comprises: If the charging time of the last charging is not within the preset time range, the count value of the current number of times of disconnection is set to zero.

5. The over-temperature protection method for a vehicle charger according to claim 1, wherein After the prompter is controlled to give an alarm and the relay is controlled to be in a disconnected state, further comprising: The count value of the current number of times of disconnection is set to zero.

6. An over-temperature protection apparatus of a vehicle charger for executing the over-temperature protection method of the vehicle charger according to any one of claims 1 to 5, characterized by The vehicle charger comprises a three-pin plug, a charging cable, a control box and a charging gun, a temperature control switch is arranged in the three-pin plug, the plug of the three-pin plug is connected to the charging cable through the temperature control switch, and the charging cable is electrically connected to the charging gun; the control box is arranged in the charging cable; The control box comprises a relay and a prompter, an input end of the relay is electrically connected with the temperature control switch through the charging cable, and an output end of the relay is electrically connected with the charging gun through the charging cable, and the over-temperature protection device comprises: A count value determination module is configured to determine a count value of a current number of times of disconnection of the temperature control switch after the temperature control switch is powered on. A judgment module is configured to determine whether the count value of the current number of times of disconnection is greater than or equal to a preset number of times. An alarm module is configured to control the prompter to give an alarm and warning when the count value of the current number of times of disconnection is greater than or equal to the preset number of times, and control the relay to be in a disconnected state.

7. A vehicle charger, characterized by, Comprise: A three-eye plug, a charging cable, a control box and a charging gun, the three-eye plug is provided with a temperature control switch, the plug blade of the three-eye plug is connected to the charging cable through the temperature control switch, and is electrically connected with the charging gun through the charging cable; The control box is arranged in the charging cable; The control box comprises a relay and a prompter, an input end of the relay is electrically connected with the temperature control switch through the charging cable, and an output end of the relay is electrically connected with the charging gun through the charging cable; the control box is used for controlling the working state of the relay and the prompter; the prompter is used for alarm and warning; The control box further comprises the over-temperature protection device of the vehicle charger according to claim 6, and the over-temperature protection device of the vehicle charger is used for executing the over-temperature protection method of the vehicle charger according to any one of claims 1-5.

8. The vehicle charger of claim 7, wherein, The plug blade of the three-eye plug comprises a live wire plug blade, a zero line plug blade and a ground wire plug blade; the temperature control switch comprises a first temperature control switch and a second temperature control switch; The live wire plug blade comprises a live wire heat dissipation area; the live wire heat dissipation area is located in the injection molding part of the three-eye plug; the zero line plug blade comprises a zero line heat dissipation area; the zero line heat dissipation area is located in the injection molding part of the three-eye plug; The first temperature control switch and the second temperature control switch are both located in the injection molding part of the three-eye plug; the live wire heat dissipation area is apart from the first temperature control switch by a first preset value; the zero line heat dissipation area is apart from the second temperature control switch by a second preset value.

9. The vehicle charger of claim 8, wherein, The live wire plug blade further comprises a live wire conductive area; the plug width of the live wire heat dissipation area is greater than the plug width of the live wire conductive area; The zero line plug blade further comprises a zero line conductive area; the plug width of the zero line heat dissipation area is greater than the plug width of the zero line conductive area.

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