Charger and charging system

Abstract

The embodiment of the invention provides a charger and a charging system, the charger comprises a power supply plug, a temperature switch and a function box, the power supply plug and the function box are connected through a charging line, a part of the charging line is located in the function box, the function box comprises a first power supply module and a relay, and the relay is connected to the charging line. The input end of the first power module is connected with the charging wire through the temperature switch, and the first output end of the first power module is connected with a coil of the relay to control the relay to be switched off or switched on. The embodiment of the invention can reduce the safety risk of the charger.

Description

Technical Field

[0001] The present application relates to the field of electronic circuit technology, and in particular to a charger and a charging system. Background Art

[0002] At present, the charging methods of electric vehicles mainly include DC charging and AC charging. During AC charging, the function box draws power from the mains socket through the power plug. After the function box is powered on, the control module in the function box controls whether the relay is turned on through software, thereby controlling whether to charge the vehicle. If there is an abnormality in the software or control module, it is impossible to stop charging in time, which poses a safety risk. Summary of the invention

[0003] The embodiments of the present application provide a charger and a charging system, which can reduce the safety risks of the charger.

[0004] A first aspect of an embodiment of the present application provides a charger, comprising a power supply plug, a temperature switch and a function box, wherein the power supply plug and the function box are connected via a charging cable, a portion of the charging cable is located within the function box, the function box comprises a first power supply module and a relay, the relay is connected to the charging cable, an input end of the first power supply module is connected to the charging cable via the temperature switch, and a first output end of the first power supply module is connected to a coil of the relay to control the opening or closing of the relay.

[0005] Optionally, the temperature switch is arranged in the power supply plug.

[0006] Optionally, the function box further includes a first switch, and the first output end of the first power module is connected to the coil of the relay through the first switch.

[0007] Optionally, the function box further includes a second power module, a first input end of the second power module is connected to the charging line, and a first output end of the second power module is connected to the coil of the relay.

[0008] Optionally, the function box further includes a second switch, and the first output end of the second power supply module is connected to the coil of the relay through the second switch.

[0009] Optionally, the functional box further includes a control module; and the second output end of the second power supply module is connected to the power supply end of the control module.

[0010] Optionally, the function box further includes a first voltage detection module, and the first voltage detection module is used to detect the voltage on the charging line;

[0011] The control module is used to determine that the power plug is inserted into the mains socket according to the voltage detected by the first voltage detection module;

[0012] The control module is further configured to control the first switch to be closed and the second switch to be opened when the power supply plug is inserted into a mains socket and charging is ready.

[0013] Optionally, the functional box further includes a second voltage detection module, and the second voltage detection module is used to detect the voltage of the input end of the first power supply module;

[0014] The control module is further configured to determine whether the temperature switch is disconnected according to the voltage detected by the second voltage detection module.

[0015] Optionally, the charging line includes a first phase line and a second phase line, the first end of the temperature switch is connected to the first phase line, the second end of the temperature switch is connected to the first input end of the first power module, the second input end of the first power module is connected to the second phase line, the first output end of the first power module is connected to the first end of the first switch, and the second end of the first switch is connected to the coil of the relay.

[0016] Optionally, the function box further includes a third voltage detection module, and the third voltage detection module is used to detect the voltage of the second end of the first switch;

[0017] The control module is also used to determine that the first power supply module fails according to the voltage detected by the third voltage detection module when the temperature switch is not disconnected;

[0018] The control module is further configured to control the first switch to open and the second switch to close when the first power module fails.

[0019] Optionally, the control module is further used to determine a protection strategy when the temperature switch is disconnected according to the accumulated number of disconnections of the temperature switch after the power plug is inserted into the mains socket.

[0020] Optionally, the control module determines a protection strategy according to the accumulated disconnection times of the temperature switch, including:

[0021] When the cumulative disconnection times of the temperature switch is less than the first threshold, the control module is further used to determine a target current reduction strategy according to the cumulative disconnection times of the temperature switch after the power plug is inserted into the mains socket; wherein the current reduction degree of the target current reduction strategy is positively correlated with the cumulative disconnection times of the temperature switch;

[0022] When the accumulated disconnection times of the temperature switch is greater than or equal to the first threshold, the control module determines to stop the charging strategy.

[0023] Optionally, the functional box also includes: a control and guidance CP module; the control module determines the target duty cycle corresponding to the target current reduction strategy according to the cumulative number of disconnections of the temperature switch, and sends a target CP signal to the vehicle's on-board charger through the control and guidance CP module, and the duty cycle of the target CP signal is the target duty cycle.

[0024] Optionally, the control module is further used to determine a protection strategy according to the cumulative number of disconnections of the temperature switch after the power plug is inserted into the mains socket, including:

[0025] When the accumulated disconnection times of the temperature switch is greater than or equal to 1, the control module sends a charging stop message to the vehicle.

[0026] Optionally, when the control module sends a stop charging message to the vehicle, the vehicle sends a notification message to the user terminal, where the notification message is used to notify the user terminal that a charging failure occurs in the charger.

[0027] Optionally, the function box further includes a prompt module. When the temperature switch is disconnected, the function box is used to send a prompt message through the prompt module, and the prompt message is used to prompt that an over-temperature fault occurs in the power plug.

[0028] Optionally, when the power supply plug is inserted into the mains socket, the cumulative number of disconnections stored in the control module is 0;

[0029] After the power supply plug is inserted into the mains socket, each time the temperature switch is detected to be disconnected, the control module adds 1 to the accumulated disconnection times;

[0030] When the power supply plug is disconnected from the mains socket, the accumulated disconnection times stored in the control module are reset to zero.

[0031] Optionally, the control module is further used to stop charging when it is determined that the second power supply module fails according to the voltage detected by the third voltage detection module when the control module controls the first switch to be opened and the second switch to be closed.

[0032] Optionally, the functional box also includes a reverse cut-off device, through which the second output end of the first power module is connected to the second input end of the second power module; the reverse cut-off device is used to prevent the second power module from supplying power to the first power module.

[0033] Optionally, the CP module includes a CP detection and control circuit, a third switch, a first resistor and a fourth switch; the first output end of the CP detection and control circuit is connected to the first end of the third switch, the second output end of the CP detection and control circuit is connected to the second end of the third switch, the third end of the third switch is connected to the first end of the first resistor, the second end of the first resistor is connected to the first end of the fourth switch, and the second end of the fourth switch is connected to the CP port of the vehicle plug.

[0034] Optionally, the function box further includes a leakage detection circuit; and the control module is further configured to control the first switch and the second switch to be disconnected when the leakage detection circuit detects that the charger is leaking.

[0035] Optionally, the function box further includes a current sampling circuit; and the control module is further configured to control the first switch and the second switch to be disconnected when the current on the charging line is detected by the current sampling circuit to be greater than a second threshold value.

[0036] Optionally, the charger further comprises a vehicle plug, and when the vehicle plug is inserted into a vehicle socket, the charger establishes a charging circuit with the vehicle.

[0037] A second aspect of the embodiments of the present application provides a charging system, comprising the charger and a vehicle as described in any one of the first aspects of the embodiments of the present application.

[0038] The charger of the embodiment of the present application includes a power supply plug, a temperature switch and a function box. The power supply plug and the function box are connected by a charging line. A part of the charging line is located in the function box. The function box includes a first power module and a relay. The relay is connected to the charging line. The input end of the first power module is connected to the charging line through the temperature switch. The first output end of the first power module is connected to the coil of the relay to control the opening or closing of the relay. In the embodiment of the present application, the temperature switch is connected between the charging line and the first power module, and the first power module supplies power to the coil of the relay. When the temperature switch is disconnected due to overtemperature, the first power module is disconnected from the charging line, and the first power module cannot supply power to the coil of the relay, so that the relay is disconnected, thereby automatically disconnecting the charging line, so that the charger stops charging. Compared with software control, the safety risk of the charger can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0040] Figure 1 is a schematic diagram of the structure of a charger provided in an embodiment of the present application;

[0041] Figure 2 is a schematic diagram of the structure of another charger provided in an embodiment of the present application;

[0042] Figure 3 is a schematic diagram of the structure of another charger provided in an embodiment of the present application;

[0043] Figure 4 is a schematic diagram of the structure of another charger provided in an embodiment of the present application;

[0044] Figure 5 is a schematic diagram of the structure of another charger provided in an embodiment of the present application;

[0045] Figure 6 is a schematic diagram of the structure of another charger provided in an embodiment of the present application;

[0046] Figure 7 is a schematic diagram of the structure of another charger provided in an embodiment of the present application;

[0047] Figure 8 It is a flow chart of a voltage detection method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0049] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, products or devices.

[0050] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0051] See also Figure 1 , Figure 1 Schematic diagram of a charger provided in an embodiment of the present application. Figure 1 As shown, the charger may include a power supply plug, a temperature switch and a function box, the power supply plug and the function box are connected through a charging line, a part of the charging line is located in the function box, the function box includes a first power module and a relay, the relay is connected to the charging line, the first power module (such as Figure 1 The input end of the power module 1) shown is connected to the charging line through a temperature switch, and the first output end of the power module 1 is connected to the coil of the relay to control the opening or closing of the relay. When the relay is closed, the charger can start charging; when the relay is disconnected, the charger stops charging. The relay divides the charging line into a first section and a second section. The first section of the charging line is located in the power plug and the function box, and the second section of the charging line is located in the function box. When the relay is closed, the first section and the second section of the charging line are connected; when the relay is disconnected, the first section and the second section of the charging line are disconnected. The second section of the charging line can be connected to the load. The first end of the temperature switch is connected to the first section of the charging line.

[0052] When the temperature switch is not disconnected, the power module 1 can draw power from the charging line and output voltage to energize the coil of the relay, thereby controlling the relay to close. When the temperature switch is disconnected due to overtemperature, the power module 1 cannot draw power from the charging line, and the power module 1 cannot output voltage to de-energize the coil of the relay, thereby controlling the relay to open.

[0053] The temperature switch may be arranged outside the power plug (for example, in a function box) or in the power plug.

[0054] In the embodiment of the present application, the temperature switch is connected between the charging line and the first power module, and the first power module supplies power to the coil of the relay. When the temperature switch is disconnected due to over-temperature, the first power module is disconnected from the charging line, and the first power module cannot supply power to the coil of the relay, thereby automatically disconnecting the charging line, causing the charger to stop charging, which can reduce the safety risk of the charger compared to software control.

[0055] The charging cable may be an AC charging cable or a DC charging cable, and may provide AC power or DC power.

[0056] The number of relays may be 1 or at least 2.

[0057] Figure 1 The charging cable is shown with a thick line as an example.

[0058] Optionally, the charging line may include a first phase line, a second phase line and a ground line. The number of relays may be two.

[0059] See also Figure 2 , Figure 2 It is a schematic diagram of the structure of another charger provided in an embodiment of the present application. Figure 2 The charging line includes a first phase line, a second phase line and a ground line PE. Figure 2 The number of relays is two, namely, the first relay K1 and the second relay K2. Figure 2 As shown, the charger includes a power supply plug, a temperature switch and a function box. The power supply plug and the function box are connected through a first phase line, a second phase line and a ground line PE. The function box includes a first power module (such as Figure 2 The power module 1 shown in the figure), the first relay K1 and the second relay K2, the first relay K1 is connected in series to the first phase line, and the second relay K2 is connected in series to the second phase line. The input end of the power module 1 (the input end of the power module 1 includes the first input end of the power module 1 and the second input end of the power module 1) is connected to the charging line through a temperature switch, and the first output end of the power module 1 is connected to the coil K1 of the first relay and the coil of the second relay K2 to control the opening or closing of the first relay K1 and the second relay K2. The first section of the first phase line is located in the power plug and the function box, the second section of the first phase line is located in the function box, and the first section of the first phase line is connected to the second section of the first phase line through the first relay K1. The first section of the second phase line is located in the power plug and the function box, the second section of the second phase line is located in the function box, and the first section of the second phase line is connected to the second section of the second phase line through the second relay K2. The ground wire PE is located in the power plug and the function box. The temperature switch is connected in series between the first segment of the first phase line and the first input terminal of the power module 1. The power module 1 is used to draw power from the first segment of the second phase line and the temperature switch from the first phase line, and to supply power to the coil of the first relay K1 and the coil of the second relay K2. Figure 2 As shown, the first end of the temperature switch is connected to the first segment of the first phase line, the second end of the temperature switch is connected to the first input end of the power module 1, the second input end of the power module 1 is connected to the second phase line, and the first output end of the power module 1 is connected to the coil of the first relay K1 (i.e. Figure 2 The coil 1 in the relay) and the coil of the second relay K2 (i.e. Figure 2 Coil 2).

[0060] In the embodiment of the present application, the temperature switch is connected in series between the first phase line and the first input terminal of the power module 1. If the temperature in the coupling area of ​​the power supply plug and the mains socket is abnormal, the temperature switch is automatically physically disconnected when the temperature of the temperature switch exceeds the thermal deformation temperature of the material, and the temperature switch is automatically physically closed when the temperature of the temperature switch is lower than the upper temperature limit when the charger is working normally. The upper temperature limit when the charger is working normally is lower than the thermal deformation temperature.

[0061] Among them, the setting of the thermal deformation temperature of the temperature switch can consider the following factors:

[0062] ① The ambient temperature of the charger is T0;

[0063] ②The power plug material of the charger must be temperature resistant to T1;

[0064] ③The power plug of the charger matches the AC power socket material with temperature resistance of T2;

[0065] ④The maximum long-term current-carrying temperature rise Tk of the charger;

[0066] Thermal deformation temperature Tb of the temperature switch: the maximum value of T2 and T1>Tb>T0+Tk.

[0067] If the temperature of the temperature switch is greater than T0+Tk, thermal deformation will occur.

[0068] Among them, the temperature switch is arranged in the power supply plug and is connected in series in the circuit of the power supply module 1. For example, the temperature switch can be set close to the first phase line. The temperature switch automatically disconnects after overtemperature. When there is an abnormality in the software or control module, the first relay K1 and the second relay K2 can also be disconnected, and there will be no problem of burning the power supply plug, which is safer. The temperature switch is not connected in series in the main power circuit, and the current carrying requirements and switch durability requirements of the temperature switch are low, and the use stability of the temperature switch is higher. For example, the temperature switch may include at least one temperature spring. The temperature switch of the embodiment of the present application may be a temperature spring, or it may be composed of multiple temperature springs connected in series. For example, the temperature switch is fixed in the power supply plug by processes such as glue filling and glue encapsulation.

[0069] The coil of the first relay K1 can also be called the control coil or low-voltage coil of the first relay K1. The coil of the second relay K2 can also be called the control coil or low-voltage coil of the second relay K2. When current passes through the coil of the first relay K1, the first relay K1 is closed, and when no current passes through the coil of the first relay K1, the first relay K1 is disconnected. When current passes through the coil of the second relay K2, the second relay K2 is closed, and when no current passes through the coil of the second relay K2, the second relay K2 is disconnected. The temperature switch is connected in series with the power module 1 and the coils of the first relay K1 and the second relay K2 in a loop. When the temperature switch is disconnected, the first relay K1 and the second relay K2 are disconnected. The lead position of the first end of the temperature switch is not fixed, and can be placed in the function box or in the power plug. Figure 2 The lead position of the first end of the temperature switch is in the function box, which is convenient for wiring. Only one temperature switch is assembled in the power plug, so the size and process are relatively simple and the cost is low. The lead position of the first end of the temperature switch can form an effective electrical connection with the temperature switch by welding, crimping, screwing, etc.

[0070] It should be noted that the coil of the first relay K1 and the coil of the second relay K2 may be different coils or the same coil. Figure 2 In the example, the coil of the first relay K1 and the coil of the second relay K2 are different coils. When the first relay K1 and the second relay K2 are the same coil, one coil controls the opening and closing of the two relays (the first relay K1 and the second relay K2), and the first relay K1 and the second relay K2 are closed and closed at the same time.

[0071] The first phase line can be any one of L1, L2, and N, and the second phase line can be any one of L1, L2, and N. The first phase line and the second phase line are different, and at least one of the first phase line L1 and the second phase line L2 is L1. Figure 2 In one embodiment, the first phase line is L1, and the second phase line is L2 or N (neutral line). In one possible embodiment, the first phase line is L2 or N (neutral line), and the second phase line is L1.

[0072] In the embodiment of the present application, L1 and L2 are two different phases of two-phase electricity. After the power supply plug is inserted into the mains socket, the voltage difference between L1 and L2 is generally about 200V, the voltage difference between L1 and N is generally about 100V, the voltage between L1 and PE is generally about 220V, and the voltage between L2 and PE is generally about 220V.

[0073] In the embodiment of the present application, the temperature switch is connected in series between the first phase line and the first power module, and the first power module supplies power to the coil of the first relay and the coil of the second relay through the first switch. When the temperature switch is disconnected due to overtemperature, the first power module cannot supply power to the coil of the first relay and the coil of the second relay, thereby automatically disconnecting the first phase line and the second phase line, so that the charger stops charging, which can reduce the safety risk of the charger compared with software control.

[0074] Optionally, the temperature switch is arranged in the power supply plug. The temperature switch is arranged in the power supply plug, and the temperature switch accurately senses the heating of the power supply plug. When the power supply plug heats up, the power supply of the coil of the relay can be disconnected through the temperature switch, thereby disconnecting the relay.

[0075] See also Figure 3 , Figure 3 It is a schematic diagram of the structure of another charger provided in an embodiment of the present application. Figure 3 is Figure 2 The functional box also includes a first switch, and the first output end of the first power module is connected to the coil of the relay through the first switch S1. When the first switch S1 is closed and the temperature switch is not disconnected, the power module 1 can supply power to the coil of the first relay K1 and the coil of the second relay K2. When the first switch S1 is disconnected or the temperature switch is disconnected, the power module 1 cannot supply power to the coil of the first relay K1 and the coil of the second relay K2. Figure 3 As shown, the first output end of the power module 1 is connected to the first end of the first switch S1, the second end of the first switch S1 is connected to the first end of the coil of the first relay K1 and the first end of the coil of the second relay K2, and the second end of the coil of the first relay K1 and the second end of the coil of the second relay K2 are grounded.

[0076] Optional, such as Figure 3 As shown, the function box also includes a second power supply module (i.e. Figure 3 The first input end of the power module 2 includes an input end 1 of the power module 2 and an input end 2 of the power module 2. The input end 1 of the power module 2 is connected to the first phase line, and the input end 2 of the power module 2 is connected to the second phase line; the first output end of the power module 2 is connected to the coil of the first relay K1 and the coil of the second relay K2. The power module 2 can supply power to the coil of the first relay K1 and the coil of the second relay K2.

[0077] Optional, such as Figure 3As shown, the function box also includes a second switch S2, and the first output end of the power module 2 is connected to the coil of the first relay K1 and the coil of the second relay K2 through the second switch S2. Adding the second switch S2 can flexibly control whether the power module 2 supplies power to the coil of the first relay K1 and the coil of the second relay K2.

[0078] Optional, such as Figure 3 As shown, the function box also includes a control module; the second output end of the power module 2 is connected to the power supply end of the control module. The power module 2 is used to draw power from the first phase line and the second phase line, and to supply power to the control module.

[0079] Optional, such as Figure 3 As shown, the function box also includes a first voltage detection module (i.e. Figure 3 The voltage detection 1 in the circuit is used to detect the voltage between the first phase line and the second phase line; the control module is used to determine whether the power supply plug is inserted into the mains socket according to the voltage detected by the voltage detection 1;

[0080] The control module is also used to control the first switch S1 to close and the second switch S2 to open when the power plug is inserted into the mains socket and charging is ready.

[0081] Optional, such as Figure 3 As shown, the function box also includes a second voltage detection module (i.e. Figure 3 Voltage detection 2), voltage detection 2 is used to detect the voltage of the first input terminal of the power module 1;

[0082] The control module is further used to determine whether the temperature switch is disconnected according to the voltage detected by the voltage detection 2 .

[0083] The control module can determine whether the power plug is inserted into the mains socket according to the voltage detected by the voltage detection 1. Specifically, it can be determined whether the power plug is inserted into the mains socket according to the voltage between the first phase line and the second phase line detected by the voltage detection 1. The voltage between the first phase line and the second phase line can be the voltage difference between the first phase line and the second phase line, or the voltage difference between the first phase line and the ground line, or the voltage difference between the second phase line and the ground line.

[0084] Ready to charge is the standard for the charger to be ready for charging as specified in the charging protocol.

[0085] Optionally, the control module determines whether the temperature switch is disconnected according to the voltage between the first phase line and the second phase line, including:

[0086] The control module determines that the temperature switch is disconnected when the voltage between the first phase line and the second phase line is less than a third threshold value;

[0087] The control module determines that the temperature switch is closed when the voltage between the first phase line and the second phase line is greater than a fourth threshold value, and the fourth threshold value is greater than the third threshold value.

[0088] In the embodiment of the present application, the third threshold value may be set to a value less than 50. For example, the third threshold value may be set to 30V.

[0089] When the first phase line is L1 and the second phase line is L2, the fourth threshold value may be set to a value greater than 150 V and less than 200 V. For example, the fourth threshold value may be set to 180 V. When the first phase line is L1 and the second phase line is N, the fourth threshold value may be set to a value greater than 50 V and less than 100 V. For example, the fourth threshold value may be set to 80 V.

[0090] If the voltage between the first phase line and the second phase line is the voltage difference between L1 and the ground line, the fourth threshold value may be set to a value greater than 150 V and less than 200 V. For example, the fourth threshold value may be set to 180V.

[0091] In the embodiment of the present application, the third threshold value and the fourth threshold value can be preset. The control module can accurately determine whether the temperature switch is disconnected according to the third threshold value and the fourth threshold value.

[0092] In the embodiment of the present application, the control module determines whether the temperature switch is disconnected according to the voltage detected by the voltage detection 2. The voltage detection 2 detects the voltage of the first input terminal of the power module 1. When the temperature switch is turned on, the voltage signal is V1, and when the temperature switch is turned off, it is V2. When the voltage detected by the voltage detection 2 is less than the fifth threshold, it is confirmed that the temperature switch is disconnected, and when the voltage detected by the voltage detection 2 is greater than the fifth threshold, it is confirmed that the temperature switch is turned on.

[0093] Exemplarily, if the first phase line is L1 in the two-phase electricity, when the temperature switch is turned on, the voltage V1 detected by the voltage detection 2 is about 220 V, and when the temperature switch is turned on, the voltage V2 detected by the voltage detection 2 is about 0 V. The fifth threshold value can be set to any value between 20-220 V. Exemplarily, the fifth threshold value can be set to 100 V.

[0094] In the embodiment of the present application, the temperature switch is connected in series between the first phase line and the power module 1, and the power module 1 supplies power to the coil of the first relay K1 and the coil of the second relay K2 through the first switch S1. When the temperature switch is disconnected due to overtemperature, the power module 1 cannot supply power to the coil of the first relay K1 and the coil of the second relay K2, thereby automatically disconnecting the first phase line and the second phase line, so that the charger stops charging, which can reduce the safety risk of the charger compared with software control.

[0095] See also Figure 4 , Figure 4 It is a schematic diagram of the structure of another charger provided in an embodiment of the present application. Figure 4 is Figure 3 Based on Figure 4 As shown, the first end of the temperature switch is connected to the first phase line, the second end of the temperature switch is connected to the first input end of the power module 1, the second input end of the power module 1 is connected to the second phase line, the first output end of the power module 1 is connected to the first end of the first switch S1, and the second end of the first switch S1 is connected to the coil of the first relay K1 and the coil of the second relay K2; the function box also includes a third voltage detection module (i.e. Figure 4 The voltage detection 3 shown is used to detect the voltage at the second end of the first switch S1;

[0096] When the temperature switch is not disconnected, the control module determines that the power module 1 fails according to the voltage detected by the voltage detection 3;

[0097] When a failure occurs in the power module 1 , the control module controls the first switch S1 to be opened and the second switch S2 to be closed.

[0098] In the embodiment of the present application, when the temperature switch is not disconnected (i.e., the temperature switch is turned on), if the voltage detected by the voltage detection 3 is less than the sixth threshold value, it is confirmed that the power module 1 has failed; if the voltage detected by the voltage detection 3 is greater than the sixth threshold value, it is confirmed that the power module 1 has not failed. When the temperature switch is turned on and the power module 1 has not failed, the voltage detected by the voltage detection 3 is about 220V, and when the temperature switch is turned on and the power module 1 has failed, the voltage V2 detected by the voltage detection 2 is about 0V. The sixth threshold value can be set to any value between 20-220V. Exemplarily, the sixth threshold value can be set to 100V.

[0099] The power module 1 supplies power to the coil of the first relay K1 and the coil of the second relay K2 through the first switch S1. When the temperature switch is not disconnected and the power module 1 fails, the coil of the first relay K1 and the coil of the second relay K2 lose power supply, thereby causing the first relay K1 and the second relay K2 to disconnect. At this time, the first relay K1 and the second relay K2 are not disconnected due to over-temperature protection. In order to ensure that the first relay K1 and the second relay K2 can work normally without being affected by the failure of the power module 1, the control module controls the first switch S1 to be disconnected and the second switch S2 to be closed, and the coil of the first relay K1 and the coil of the second relay K2 are powered by the power module 2, thereby ensuring that the first relay K1 and the second relay K2 can work normally.

[0100] It should be noted that, in the event of a failure of the power module 1, the control module can still determine whether the temperature switch is disconnected based on the voltage detected by the voltage detection 2. For details, please refer to the above embodiments, which will not be repeated here. In the event of a failure of the power module 1, if the control module determines that the temperature switch is disconnected based on the voltage detected by the voltage detection 2, the control module can send a control signal for shutting down to the first relay K1 and the second relay K2 to control the second relay K2 to disconnect. In the event of a failure of the power module 1, if it is detected that the temperature switch is disconnected, the control module can still control the first relay K1 and the second relay K2 to disconnect by software control, thereby realizing the function of over-temperature protection.

[0101] Optionally, when the temperature switch is disconnected, the control module determines a protection strategy based on the cumulative number of disconnections of the temperature switch after the power plug is inserted into the mains socket.

[0102] In an embodiment of the present application, when the temperature switch is disconnected, the control module determines the protection strategy based on the cumulative number of disconnections of the temperature switch after the power plug is inserted into the mains socket. Generally speaking, the greater the cumulative number of disconnections of the temperature switch after the power plug is inserted into the mains socket, the greater the protection. For example, each time the temperature switch is disconnected, as the cumulative number of times increases, the next time the temperature switch is closed, the operating current of the charger will be lower than when the temperature switch was last closed, or even reduced to 0. The disconnection of the temperature switch may be caused by the high operating current of the charger (the high operating current of the charger may cause the temperature to rise). By reducing the operating current of the charger, the temperature switch is not easily disconnected, thereby extending the working time of the charger. In the event of a charger failure, the charger is allowed to charge the vehicle as much as possible.

[0103] Optionally, when the power plug is inserted into the mains socket, the cumulative number of disconnections stored in the control module is 0;

[0104] After the power supply plug is inserted into the mains socket, each time the temperature switch is detected to be disconnected, the control module will add 1 to the cumulative disconnection times;

[0105] When the power plug is disconnected from the AC power socket, the accumulated disconnection times stored in the control module are reset to zero.

[0106] In the embodiment of the present application, the control module can store data of a cumulative number of disconnections. When the power plug is inserted into the mains socket, that is, when the control module is just powered on, the data of the cumulative number of disconnections is 0.

[0107] When the control module is powered (when the power plug is plugged into the mains socket), the data of the cumulative disconnection times can be increased by 1 each time the temperature switch is detected to be disconnected. When the control module is not powered (when the power plug is disconnected from the mains socket), that is, when the control module is powered off, the data of the cumulative disconnection times is cleared.

[0108] In the embodiment of the present application, it can be ensured that the cumulative number of disconnections is the cumulative number of disconnections of the temperature switch after the power plug is inserted into the mains socket. If the cumulative number of disconnections continues to rise (that is, it will not be reset to zero), then after the power plug is inserted into the mains socket, the charging current of the charger to the vehicle will be limited, and the charger may even stop charging the vehicle (for example, when the cumulative number of disconnections is greater than or equal to the first threshold), which does not conform to the actual usage scenario. By clearing the data of the cumulative number of disconnections when the control module is powered off, it can be ensured that the cumulative number of disconnections is re-counted from 0 each time the power plug is inserted into the mains socket, which can improve the user experience.

[0109] The voltage detection 2 can periodically detect the voltage of the first input terminal of the power module 1. The control module can determine whether the temperature switch is disconnected according to the voltage detected by the voltage detection 2. Each time the temperature switch is detected to be disconnected, it means that each time the temperature switch is detected to be from closed to open.

[0110] The cumulative number of disconnections refers to the number of times the temperature switch is detected to be disconnected from closed after the power plug is inserted into the AC power socket. For example, the control module determines whether the temperature switch is disconnected based on the voltage detected by voltage detection 2. For example, voltage detection 2 measures the pressure difference 10 times (during these 10 measurements, the control module continues to have power, that is, the power plug and the AC power socket are continuously coupled), and the corresponding states of the temperature switch are: closed, closed, disconnected, disconnected, disconnected, closed, closed, closed, disconnected, and disconnected. The cumulative number of disconnections is 2 times.

[0111] Optionally, the control module is used to determine a protection strategy according to the cumulative number of disconnections of the temperature switch after the power plug is inserted into the mains socket, including:

[0112] When the cumulative disconnection times of the temperature switch is less than the first threshold, the control module determines a target current reduction strategy according to the cumulative disconnection times of the temperature switch; wherein the current reduction degree of the target current reduction strategy is positively correlated with the cumulative disconnection times of the temperature switch;

[0113] When the accumulated disconnection times of the temperature switch is greater than or equal to a first threshold, the control module determines to stop the charging strategy.

[0114] In an embodiment of the present application, the first threshold value may be pre-set. The first threshold value may be an integer greater than or equal to 2. The target current reduction strategy refers to a strategy for reducing the operating current of the charger. Each time the temperature switch is disconnected, if the cumulative number of disconnections of the temperature switch is less than the first threshold value, the next time the temperature switch is closed, the operating current of the charger will be reduced compared to the last time the temperature switch was closed.

[0115] The charging stop strategy is a strategy for the charger to stop charging. When the cumulative disconnection times of the temperature switch is greater than or equal to the first threshold, the control module can control the charger to stop working, that is, stop charging the vehicle.

[0116] For example, if the first threshold is 3, after the power plug is inserted into the mains socket, if the working current of the charger is the rated current (for example, 15A), the temperature switch is disconnected for the first time, and the cumulative disconnection times of the temperature switch is 1 time. When the temperature switch is closed next time, the working current of the charger can be controlled to be 12A. If the temperature switch is disconnected for the second time, the cumulative disconnection times of the temperature switch is 2 times. When the temperature switch is closed next time, the working current of the charger can be controlled to be 10A. If the temperature switch is disconnected for the third time, the cumulative disconnection times of the temperature switch is 3 times. When the temperature switch is closed next time, the charger can be controlled to stop working, that is, stop charging the vehicle.

[0117] Optional, see Figure 5 , Figure 5 It is a schematic diagram of the structure of another charger provided in an embodiment of the present application. Figure 5 is Figure 4 Based on Figure 5 As shown, in Figure 4 On the basis of this, the function box of the charger also includes: a control and guidance CP module; the control module is also used to determine the target duty cycle corresponding to the target current reduction strategy according to the cumulative number of disconnections of the temperature switch, and send a target CP signal to the vehicle's on-board charger through the control and guidance CP module, and the duty cycle of the target CP signal is the target duty cycle.

[0118] The CP signal is a signal sent by the control module to the on-board charger of the vehicle. The CP signal can be generated by a control pilot (CP) module, and the control signal can control the duty cycle of the CP signal generated by the CP module.

[0119] The vehicle's on-board charger receives the CP signal. If the on-board charger recognizes that the duty cycle of the CP signal has changed (the duty cycle of the currently received CP signal is smaller than the duty cycle of the last received CP signal), the on-board charger will automatically adjust the load, thereby adjusting the operating current of the charger.

[0120] In the embodiment of the present application, the control module can send a target CP signal to an on-board charger (OBC) of the vehicle through the CP module, thereby controlling the operating current of the charger.

[0121] The greater the cumulative disconnection times of the temperature switch, the lower the target duty cycle corresponding to the target current reduction strategy, that is, the lower the operating current of the charger.

[0122] Exemplarily, if the first threshold is 3, after the power plug is inserted into the AC power socket, if the working current of the charger is the rated current (for example, 15A), the duty cycle of the CP signal sent by the control module to the vehicle's on-board charger through the CP module is 25%. When the temperature switch is disconnected for the first time, the cumulative number of disconnections of the temperature switch is 1. When the temperature switch is closed next time, the working current of the charger can be controlled to be 12A. At this time, the duty cycle of the CP signal sent by the control module to the vehicle's on-board charger through the CP module is 20%. When the temperature switch is disconnected for the second time, the cumulative number of disconnections of the temperature switch is 2. When the temperature switch is closed next time, the working current of the charger can be controlled to be 10A. At this time, the duty cycle of the CP signal sent by the control module to the vehicle's on-board charger through the CP module is 16.67%. When the temperature switch is disconnected for the third time, the cumulative number of disconnections of the temperature switch is 3 times. When the temperature switch is closed next time, the charger can be controlled to stop working. At this time, the duty cycle of the CP signal sent by the control module to the vehicle's on-board charger through the CP module is 0% or 100%, that is, charging of the vehicle is stopped.

[0123] Optional, such as Figure 5 As shown, the function box also includes a current sampling circuit; the control module is also used to control the first switch S1 and the second switch S2 to disconnect when the current of the charging line (for example, the first phase line or the second phase line) is detected by the current sampling circuit to be greater than a second threshold.

[0124] The leakage detection circuit is used to detect whether leakage occurs in the first phase line and the second phase line. The current sampling circuit is used to detect the current of the first phase line, so as to detect whether the charging current is abnormal.

[0125] When the control module detects that the charger is leaking electricity through the leakage detection circuit, the control module controls the first switch S1 to be disconnected; when the control module is powered only by the power module 2, the second switch S2 is disconnected; the purpose of controlling the first relay K1 and the second relay K2 to be disconnected can be achieved when the charger is detected to be leaking electricity, thereby improving the charging safety of the charger.

[0126] Optional, such as Figure 5 As shown, the charger further includes a vehicle plug. When the vehicle plug is inserted into a vehicle socket, the charger and the vehicle establish a charging circuit.

[0127] Among them, the vehicle socket can be connected to the vehicle's on-board charger OBC, so that the charger and the vehicle establish a charging circuit. The charging system can establish a charging circuit between the AC power socket, power supply plug, function box, vehicle plug, vehicle socket, vehicle's OBC and power battery to realize charging of the power battery.

[0128] The vehicle plug is coupled with the vehicle socket to transmit the electrical energy of the mains socket to the vehicle's power battery and storage battery to achieve the charging function.

[0129] The function box and the power supply plug, the function box and the vehicle plug can be an integrated structure, or they can be Figure 5 The functional box shown is between the power supply plug and the vehicle plug, which is not limited in the embodiment of the present application.

[0130] The charger includes: a power supply plug, a function box, and a vehicle plug, wherein the power supply plug and the function box are connected via a power cord ( Figure 5 L1, L2 and the power supply line connected to the power module 2 and the power module 1) are connected, and the function box and the vehicle plug are connected through the charging cable ( Figure 5 Connect the cable connected to L1, L2, PE, and CP of the vehicle plug.

[0131] Optional, such as Figure 5 As shown, the CP module includes a CP detection and control circuit, a third switch S3, a first resistor R1 and a fourth switch S4; the first output end of the CP detection and control circuit is connected to the first end of the third switch S3, the second output end of the CP detection and control circuit is connected to the second end of the third switch S3, the third end of the third switch S3 is connected to the first end of the first resistor R1, the second end of the first resistor R1 is connected to the first end of the fourth switch S4, and the second end of the fourth switch S4 is connected to the CP port of the vehicle plug.

[0132] In the embodiment of the present application, the first output terminal of the CP detection and control circuit can output a voltage of 12V, and the second output terminal of the CP detection and control circuit can output a pulse width modulation (PWM) signal.

[0133] Among them, the power supply plug of the charger and the mains socket are coupled and plugged to form an electrical connection. At this time, the temperature spring is in a normally closed state. At this time, the first switch S1 can be in a normally open state or a normally closed state. When the first switch S1 is in a normally open state and the power supply plug is connected to the mains socket, the coils of the first relay K1 and the second relay K2 are not powered. When charging is ready, the control module controls the first switch S1 to close, and the power supply module 1 does not power the coils of the first relay K1 and the second relay K2, and the first relay K1 and the second relay K2 are energized. When the first switch S1 is in a normally closed state, the voltage at the first detection point of the CP can be used to determine whether the vehicle plug is connected to the vehicle socket. If the connection fails, the first switch S1 can be disconnected immediately.

[0134] The first detection point of CP is Figure 5 The connection point of the third switch S3 and the first resistor R1. After the vehicle plug and the vehicle socket are connected together, the voltage of the first detection point of CP will change. The control module can determine whether the vehicle plug and the vehicle socket are coupled by the voltage detected by the first detection point of CP. If coupled, the first switch S1 is kept in a normally closed state. If not coupled, the first switch S1 is disconnected to reduce the risk of electric shock.

[0135] Optionally, when the cumulative number of disconnections of the temperature switch is greater than or equal to 1, the control module sends a stop charging message to the vehicle to cause the charger to stop charging the vehicle.

[0136] In the embodiment of the present application, as long as the temperature switch is detected to be disconnected, a stop charging message will be sent to the vehicle to stop the charger from charging the vehicle. When the temperature switch is detected to be disconnected, the charger stops charging the vehicle. After the temperature switch over-temperature protection is disconnected, the charger stops working to prevent the charger from overheating the temperature switch again, thereby protecting the charger and preventing the temperature switch from being repeatedly disconnected and closed, thereby increasing the service life of the temperature switch.

[0137] The control module sends a stop charging message to the vehicle so that the charger stops charging the vehicle. Specifically, the control module sends a specific CP signal to the on-board charger of the vehicle through the CP module.

[0138] Optionally, the specific CP signal may be a CP signal specified in a national standard: for example, a CP signal with a duty cycle of 100% or 0%.

[0139] Optionally, the specific CP signal can be a CP signal agreed upon by the charger and the vehicle: for example, a CP signal with a duty cycle of 100% and a duty cycle of 20% alternating. Exemplarily, the first half of the CP signal is a duty cycle of 100%, and the second half is a duty cycle of 20%.

[0140] Optionally, when the control module sends a stop charging message to the vehicle, the vehicle sends a notification message to the user terminal, where the notification message is used to notify the user terminal that a charging failure occurs in the charger.

[0141] In the embodiment of the present application, the control module sends a stop charging message to the vehicle, so that the vehicle adjusts the load, thereby causing the charger to stop charging the vehicle. The vehicle can establish communication with the user terminal. For example, the vehicle can notify the user through the cloud platform or APP (display the notification message on the user terminal), and can also display the notification message on the vehicle's instrument or display screen when the vehicle is started next time.

[0142] The embodiments of the present application can promptly notify the user when an over-temperature failure occurs in the charger, thereby improving the user experience.

[0143] See also Figure 6 , Figure 6 It is a schematic diagram of the structure of another charger provided in an embodiment of the present application. Figure 6 is Figure 5 Based on Figure 6 As shown, in Figure 5 On the basis of, the function box of the charger also includes: a prompt module, when the temperature switch is disconnected, the function box sends a prompt message through the prompt module, and the prompt message is used to prompt that the power supply plug has an over-temperature fault.

[0144] Among them, the prompt module can be at least one of a voice module and a display module. The prompt module can send at least one of a voice prompt message, a text prompt message, and an optical prompt message. The prompt message can include at least one of a voice prompt message and a text prompt message, and the prompt message can prompt that the power plug has an overtemperature fault. The user can be prompted in time through the prompt module on the function box. Exemplarily, the prompt module can include a display module, and the display module can send out sound and light prompt messages.

[0145] Optionally, the control module is further configured to stop charging when it is determined that a fault occurs in the power module 2 according to the voltage detected by the voltage detector 3 when the control module controls the first switch S1 to be opened and the second switch S2 to be closed.

[0146] In the embodiment of the present application, when both the power module 1 and the power module 2 fail, the coils of the first relay K1 and the second relay K2 lose power supply, and the charger stops charging the vehicle.

[0147] See also Figure 7 , Figure 7 It is a schematic diagram of the structure of another charger provided in an embodiment of the present application. Figure 7 is Figure 6 Based on Figure 7As shown, in Figure 6 On the basis of the charger, the function box also includes: reverse cut-off device ( Figure 7 The reverse cutoff device takes diode D1 as an example), the second output end of the power module 1 is connected to the second input end of the power module 2 through the reverse cutoff device; the reverse cutoff device is used to prevent the power module 2 from supplying power to the power module 1, and can prevent the power module 1 from supplying power to the coil of the first relay K1 and the coil of the second relay K2 through the first switch S1 when the temperature switch is disconnected, thereby improving the safety of the charger.

[0148] Optionally, when the power module 2 fails, the power module 1 supplies power to the control module through a reverse current cutoff device.

[0149] Figure 7 In the embodiment, the reverse current cutoff device is a diode D1 , wherein the anode of the diode is connected to the second output terminal of the power module 1 , and the cathode of the diode is connected to the third input terminal of the power module 2 .

[0150] In the embodiment of the present application, when the power module 2 fails, the power module 1 can supply power to the control module through the reverse cutoff device. Specifically, when the power module 2 fails, the second output end of the power module 1 is connected to the third input end of the power module 2 through the reverse cutoff device, and the first output end of the power module 2 is connected to the third input end of the power module 2, so that the power module 1 can supply power to the control module through the reverse cutoff device.

[0151] In the embodiment of the present application, when one of the power module 2 and the power module 1 fails, the charger can work normally. The endurance service life of the charger is increased. When the power module 2 fails, the charger can still work and can perform over-temperature protection, with a higher safety factor; when the power module 1 fails, the charger can still work, and the control module can determine whether it is over-temperature (whether the temperature switch is disconnected) through voltage detection 2, and control the first relay K1 and the second relay K2 to disconnect when the temperature is over-temperature (when the temperature switch is disconnected). The embodiment of the present application designs two power modules (power module 2 and power module 1). When one of the power modules fails, the charger can still work, which reduces the failure rate of the charger and increases the safe charging time of the charger.

[0152] When the power plug is effectively inserted into the mains socket, the control module of the function box can be powered by the power module 2 and / or the power module 1, and the power module 1 supplies power to the coils of the first relay K1 and the second relay K2 through the first switch S1.

[0153] See also Figure 8 , Figure 8 It is a flow chart of a voltage detection method provided in an embodiment of the present application. Figure 8 The method can be based on Figure 7 The charger shown. Figure 8 As shown, the method includes the following steps.

[0154] 801, start.

[0155] 802, the first voltage detection circuit detects the voltage between L1 and L2, or detects the voltage between L1 and ground, or detects the voltage between L2 and ground. The control module determines whether the charging plug is inserted into the AC power socket according to the voltage detected by the first voltage detection circuit.

[0156] Among them, the voltage detection circuit 1 determines whether the charging plug is connected to the mains by detecting the voltage between the phase lines (L1 and L2, L1 and N), or between the phase lines (L1, L2, N) and PE; optionally, when the plug is effectively inserted into the mains, S1 is in the normally open state, and charging is ready, the control module can control S1 to close.

[0157] 803, when the charging plug is inserted into the mains socket, the control module detects whether there is voltage at the first input terminal of the power module 1 through the voltage detection 2. If yes, execute step 804; if no, execute step 805.

[0158] The temperature switch is connected in series to the input end of the power module 1; the voltage between the temperature switch and the relay coil is the city voltage. The detection voltage 2 detects the input voltage of the power module 1. When the temperature switch is turned on, the voltage signal detected by the detection voltage 2 is V1, and when the temperature switch is turned off, the voltage signal detected by the detection voltage 2 is V2.

[0159] 804 , the control module detects whether there is voltage at the second end of the first switch S1 through voltage detection 3 . If yes, execute step 806 ; if no, execute step 807 .

[0160] The power module 2 supplies power to the control module, the power module 1 can supply power to the power module 2, and the power module 2 cannot directly supply power to the circuit of the power module 1.

[0161] 805, the control module confirms that the temperature switch is disconnected, issues an over-temperature prompt, controls the CP module to adjust the duty cycle of the CP signal and counts the cumulative number of disconnections.

[0162] In the embodiment of the present application, when the temperature switch is turned off, the second switch S2 is not closed and remains in an open state.

[0163] 806, the control module confirms that the charging connection is normal.

[0164] 807 , the control module confirms that the power module 1 fails, opens the first switch S1 , and closes the second switch S2 .

[0165] When voltage detection 2 detects voltage and voltage detection 3 detects no voltage, it is confirmed that power module 1 fails. At this time, the power supply lines of the coils of the first relay K1 and the second relay K2 are broken, and the first relay K1 and the second relay K2 are disconnected. The control module is powered by power module 2 and controls S1 to be normally open. When voltage detection 2 detects voltage and voltage detection 3 detects no voltage, the control module controls S2 to close, the relay coil power supply circuit is turned on, and the first relay K1 and the second relay K2 are closed; at this time, the S2 switch completely replaces the function of S1.

[0166] After executing step 807 , continue to execute step 808 .

[0167] 808 , the control module detects whether there is voltage at the second end of the first switch S1 through voltage detection 3 . If yes, execute step 806 ; if no, execute step 809 .

[0168] When the control module detects through the voltage detection 3 that the second end of the first switch S1 changes from no voltage to voltage, the CP pilot signal is controlled to send a PWM signal, and the charging is normally connected. The voltage is continuously detected through the second voltage detection circuit. If the second voltage detection circuit detects that there is no voltage, it can be determined that the temperature switch is disconnected. At this time, charging can be stopped or the charging current can be reduced.

[0169] 809, confirm that power module 2 is faulty.

[0170] When power module 2 fails, power module 1 Figure 7 As shown, all output circuits of the power module 2 can be powered. When the temperature switch is disconnected, the function box loses power and the number of over-temperature times cannot be calculated. At this time, the charging strategy cannot be reduced, but the basic function of over-temperature power off can still be guaranteed to prevent the power plug from burning.

[0171] 810, end.

[0172] When the temperature inside the power plug is too high and the temperature spring is at the thermal deformation temperature, the temperature spring automatically disconnects.

[0173] When the power module 1 is powered off, the input end of the relay coil is in an open circuit state. At this time, the coils of the first relay K1 and the second relay K2 (which can be called low-voltage coils) are not powered, and the contacts of the first relay K1 and the second relay K2 (which can be called high-voltage contacts) are disconnected, and the charger is passively disconnected from charging. The contact of the first relay K1 can be the contact of the first relay K1 connected in series with the first phase line, and the contact of the second relay K2 can be the contact of the second relay K2 connected in series with the first phase line.

[0174] The control module recognizes that the voltage detected by voltage detection point 2 is 0V; recognizes that the voltage detected by voltage detection point 3 is 0V, and S2 is not closed. The control module adjusts the CP signal (also called CP pilot signal) according to the voltage value V2 of voltage detection point 2, and the vehicle side adjusts the charging demand current according to the CP signal.

[0175] When the temperature of the plug drops to a level where the temperature switch is closed, the power supply circuit of the coil is turned on, the first relay K1 and the second relay K2 are energized, and charging begins.

[0176] During the temperature recovery period of the temperature spring, the control module can control the fourth switch S4 to be disconnected, so that the vehicle detects the connection confirmation (CC) signal, but there is no power voltage and CP signal input, and the default is power-off state, and the vehicle will not report a fault, so that the charger can be compatible with more brands of vehicles (because some vehicles will sleep for a certain period of time when they cannot detect power input, and need the rising signal of CP to wake up). The CC signal can also be called the plug-in signal.

[0177] The embodiment of the present application also provides a charging system, which may include the above charger and a vehicle. The charger may charge a power battery of the vehicle.

[0178] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0179] In the several embodiments provided in the present application, it should be understood that the disclosed charger and charging system can be implemented in other ways. For example, the charger embodiments described above are only schematic, and the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed.

Claims

1. A charger, characterized in that: The invention comprises a power supply plug, a temperature switch and a function box, wherein the power supply plug and the function box are connected via a charging line, a part of the charging line is located in the function box, the function box comprises a first power supply module and a relay, the relay is connected to the charging line, an input end of the first power supply module is connected to the charging line via the temperature switch, and a first output end of the first power supply module is connected to a coil of the relay to control the opening or closing of the relay.

2. The charger according to claim 1, characterized in that: The temperature switch is disposed in the power supply plug.

3. The charger according to claim 1 or 2, characterized in that: The function box further includes a first switch, and the first output end of the first power module is connected to the coil of the relay through the first switch.

4. The charger according to any one of claims 1 to 3, characterized in that: The function box further comprises a second power module, a first input end of the second power module is connected to the charging line, and a first output end of the second power module is connected to the coil of the relay.

5. The charger according to claim 4, characterized in that: The function box further includes a second switch, and the first output end of the second power supply module is connected to the coil of the relay through the second switch.

6. The charger according to claim 5, characterized in that: The functional box also includes a control module; the second output end of the second power supply module is connected to the power supply end of the control module.

7. The charger according to claim 6, characterized in that: The function box further comprises a first voltage detection module, wherein the first voltage detection module is used to detect the voltage on the charging line; The control module is used to determine that the power plug is inserted into the mains socket according to the voltage detected by the first voltage detection module; The control module is further configured to control the first switch to be closed and the second switch to be opened when the power supply plug is inserted into a mains socket and charging is ready.

8. The charger according to claim 7, characterized in that: The functional box further comprises a second voltage detection module, wherein the second voltage detection module is used to detect the voltage at the input end of the first power supply module; The control module is further configured to determine whether the temperature switch is disconnected according to the voltage detected by the second voltage detection module.

9. The charger according to claim 8, characterized in that: The functional box further comprises a third voltage detection module, and the third voltage detection module is used to detect the voltage of the second end of the first switch; The control module is also used to determine that the first power supply module fails according to the voltage detected by the third voltage detection module when the temperature switch is not disconnected; The control module is further configured to control the first switch to open and the second switch to close when the first power module fails.

10. The charger according to claim 8 or 9, characterized in that: The control module is further used to determine a protection strategy according to the accumulated disconnection times of the temperature switch after the power supply plug is inserted into the mains socket when the temperature switch is disconnected.

11. The charger according to claim 10, characterized in that: The control module is also used to determine a protection strategy according to the cumulative number of disconnections of the temperature switch after the power plug is inserted into the mains socket, including: When the cumulative disconnection times of the temperature switch is less than a first threshold, the control module determines a target current reduction strategy according to the cumulative disconnection times of the temperature switch; wherein the current reduction degree of the target current reduction strategy is positively correlated with the cumulative disconnection times of the temperature switch; When the accumulated disconnection times of the temperature switch is greater than or equal to the first threshold, the control module determines to stop the charging strategy.

12. The charger according to claim 11, characterized in that: The functional box also includes: a control and guidance CP module; the control module is also used to determine the target duty cycle corresponding to the target current reduction strategy according to the cumulative number of disconnections of the temperature switch, and send a target CP signal to the vehicle's on-board charger through the control and guidance CP module, and the duty cycle of the target CP signal is the target duty cycle.

13. The charger according to claim 10, characterized in that: The control module is also used to determine a protection strategy according to the cumulative number of disconnections of the temperature switch after the power plug is inserted into the mains socket, including: When the accumulated disconnection times of the temperature switch is greater than or equal to 1, the control module sends a charging stop message to the vehicle.

14. The charger according to any one of claims 1 to 13, characterized in that: The function box further comprises a prompt module. When the temperature switch is disconnected, the function box is used to send a prompt message through the prompt module. The prompt message is used to prompt that an over-temperature fault occurs in the power supply plug.

15. The charger according to claim 10, characterized in that: When the power supply plug is inserted into the mains socket, the cumulative number of disconnections stored in the control module is 0; After the power supply plug is inserted into the mains socket, each time the temperature switch is detected to be disconnected, the control module adds 1 to the accumulated disconnection times; When the power supply plug is disconnected from the mains socket, the accumulated disconnection times stored in the control module are reset to zero.

16. The charger according to claim 9, characterized in that: The control module is further configured to stop charging when it is determined that the second power supply module fails according to the voltage detected by the third voltage detection module, when the control module controls the first switch to be opened and the second switch to be closed.

17. The charger according to any one of claims 4 to 13, characterized in that: The functional box also includes a reverse cutoff device, through which the second output end of the first power module is connected to the second input end of the second power module; the reverse cutoff device is used to prevent the second power module from supplying power to the first power module.

18. The charger according to any one of claims 4 to 17, characterized in that: The functional box also includes a leakage detection circuit; the control module is also used to control the first switch and the second switch to be disconnected when the leakage detection circuit detects that the charger is leaking.

19. The charger according to any one of claims 4 to 18, characterized in that: The functional box further includes a current sampling circuit; the control module is further configured to control the first switch and the second switch to be disconnected when the current sampling circuit detects that the current of the charging line is greater than a second threshold.

20. The charger according to any one of claims 1 to 19, characterized in that: The charger further comprises a vehicle plug. When the vehicle plug is inserted into a vehicle socket, the charger establishes a charging circuit with the vehicle.

21. A charging system, characterized in that: The invention comprises a charger and a vehicle as described in any one of claims 1 to 20.

Images