Electric vehicle charging protection device, method, terminal, electric vehicle and storage medium

Abstract

The application relates to the technical field of electric vehicle control, in particular to an electric vehicle charging protection device and method, a terminal, an electric vehicle and a storage medium, which comprise a voltage division and current limiting module connected between the output end of an auxiliary switching power supply and the input end of a controller module; the voltage division and current limiting module is used for converting a first voltage output by the auxiliary switching power supply into a second voltage, and automatically limiting the current output of the auxiliary switching power supply when grid voltage fluctuates or the auxiliary switching power supply is abnormal; wherein the value of the second voltage is smaller than that of the first voltage; the controller module is used for detecting the second voltage and performing charging control or safety protection operation according to the second voltage. The application can effectively limit the power output of the auxiliary switching power supply and ensure the safety and controllability of the charging process.

Description

Technical Field

[0001] The present invention relates to the field of electric vehicle control technology, and in particular to an electric vehicle charging protection device, method, terminal, electric vehicle and storage medium. Background Art

[0002] During the electric vehicle charging process, the charging station provides the necessary 12V low-voltage power to various electrical appliances on the vehicle through a low-voltage auxiliary circuit. According to the "GBT18487.1 Electric Vehicle Conductive Charging System" standard, the electric vehicle controller must first confirm that the low-voltage auxiliary power from the charging station meets the 12V standard before initiating the subsequent charging process. However, due to power grid fluctuations and quality issues with the charging station's switching power supply, the output voltage of the low-voltage auxiliary power supply often struggles to maintain stability. This has led many electric vehicle designs to abandon the direct use of auxiliary power. However, the 12V detection requirement is a national standard and will continue to be retained.

[0003] like Figure 1 The figure shows a schematic diagram of the current low-voltage auxiliary power supply connection. The positive output terminal (i.e., A+) of the auxiliary switching power supply 1 is connected to the controller module 3 (typically the vehicle controller), the negative output terminal (i.e., A-) of the auxiliary switching power supply 1 is connected to the vehicle body 4, and the vehicle body 4 is connected to the protective earth (PE). When the power grid is stable and the auxiliary switching power supply 1 is reliable, the controller module 3 can effectively detect the 12V output. However, this connection method and detection strategy hides significant safety risks: when the power grid fluctuates or the auxiliary switching power supply 1 is abnormal, a voltage difference may occur between the A- terminal and the PE of the auxiliary switching power supply 1. This not only violates safety design principles but can also cause serious accidents such as wiring harness ablation or even local fires. Numerous similar cases have been reported in the aftermarket.

[0004] In-depth analysis revealed that when the grid voltage is unstable, a voltage difference will appear between the auxiliary switching power supply's A-terminal and the PE terminal. This difference varies with grid voltage fluctuations and can be positive or negative. Particularly serious is that when this voltage difference persists and the charging pile is loaded with a high load (such as a typical 300W load), the wire between the A-terminal and the PE terminal will experience a large amount of power consumption, heating up like a "resistance wire," ultimately causing the wire to burn out or even catch fire.

[0005] Although existing patent documents such as CN210478420U have proposed a universal charging pile auxiliary power supply identification and conversion circuit, it fails to fully consider the impact of grid fluctuations and the quality of the auxiliary switch power supply on the voltage stability of the A-terminal, and directly grounds the A-terminal, which poses potential risks. Similarly, patent document CN107231034B discloses a charging pile auxiliary power supply output voltage adaptive control method, which is used to switch the 12V and 24V outputs of the charging pile auxiliary power supply to adapt to different vehicle voltage levels (24V system and 12V system). Although this method solves the adaptation problem of different vehicle voltage levels, it also does not consider the impact of grid fluctuations and the quality of the auxiliary switch power supply on the voltage stability of the A-terminal.

[0006] Therefore, it is necessary to develop a new electric vehicle charging protection device, method, terminal, electric vehicle and storage medium. Summary of the Invention

[0007] The object of the present invention is to provide an electric vehicle charging protection device, method, terminal, electric vehicle and storage medium, which can effectively limit the power output of the auxiliary switching power supply to ensure the safety and controllability of the charging process.

[0008] In a first aspect, an electric vehicle charging protection device according to the present invention includes a voltage-dividing and current-limiting module connected between an output terminal of an auxiliary switching power supply and an input terminal of a controller module;

[0009] The voltage dividing and current limiting module is used to convert the first voltage output by the auxiliary switching power supply into a second voltage, and automatically limit the current output of the auxiliary switching power supply when the grid voltage fluctuates or the auxiliary switching power supply is abnormal; wherein the value of the second voltage is smaller than the first voltage;

[0010] The controller module is used to detect the second voltage and perform charging control or safety protection operations according to the second voltage.

[0011] Optionally, the voltage-dividing and current-limiting module includes a first voltage-dividing and current-limiting unit, a second voltage-dividing and current-limiting unit, a current-limiting resistor unit and an isolation inductor unit;

[0012] One end of the first voltage dividing and current limiting unit is connected to the positive output end of the auxiliary switching power supply;

[0013] The other end of the first voltage-dividing and current-limiting unit is connected to the negative output end of the auxiliary switching power supply through the second voltage-dividing and current-limiting unit and the current-limiting resistor unit in sequence;

[0014] The connection point between the second voltage-dividing and current-limiting unit and the current-limiting resistor unit is connected to PE via the isolation inductor unit;

[0015] The connection point of the first voltage-dividing and current-limiting unit and the second voltage-dividing and current-limiting unit is connected to the input terminal of the controller module, ensuring that current and voltage flow correctly within the module. At the same time, the setting of the isolation inductor unit improves the anti-interference ability and safety of the circuit.

[0016] Optionally, the first voltage-dividing and current-limiting unit includes at least one resistor, or a lamp, or a motor;

[0017] The second voltage-dividing and current-limiting unit includes at least one resistor;

[0018] The current limiting resistor unit includes at least one resistor;

[0019] The isolation inductor unit includes at least one inductor, wherein the power of the auxiliary switching power supply is consumed through a resistor, or electrical equipment such as a motor and a lamp. For example, the motor can be used for ventilation and heat dissipation lamp systems of electric vehicles, and the lamp can be used for heat dissipation lamp systems.

[0020] Optionally, the resistance values ​​of the first voltage-divider and current-limiting unit, the second voltage-divider and current-limiting unit, and the current-limiting resistor unit are all greater than 1000 ohms, and the ratio of the resistance values ​​of any two units does not exceed 2. By setting the resistance values ​​of the first voltage-divider and current-limiting unit, the second voltage-divider and current-limiting unit, and the current-limiting resistor unit to be greater than 1000 ohms, the current is effectively limited, preventing overheating and damage caused by excessive current. The ratio of the resistance values ​​of any two units does not exceed 2. This design ensures relatively uniform voltage distribution in the circuit and avoids voltage instability caused by large differences in resistance values.

[0021] Optionally, the resistance values ​​of the first voltage-divider and current-limiting unit, the second voltage-divider and current-limiting unit, and the current-limiting resistor unit are equal. When the resistance values ​​of the first voltage-divider and current-limiting unit, the second voltage-divider and current-limiting unit, and the current-limiting resistor unit are equal, the circuit design is simpler and more unified, reducing manufacturing costs and maintenance difficulties. Equal resistance values ​​also mean that the voltage drop and current distribution in the circuit are more uniform, which helps to improve the performance stability and reliability of the entire charging protection device.

[0022] Optionally, a voltage-stabilizing capacitor group is further included, wherein the voltage-stabilizing capacitor group includes at least one voltage-stabilizing capacitor, and its configuration includes at least one of the following situations:

[0023] Connect one or more voltage-stabilizing capacitors between the live wire and PE;

[0024] Connect one or more voltage stabilizing capacitors between the neutral line and PE;

[0025] One or more voltage stabilizing capacitors are connected between the positive output terminal of the auxiliary switching power supply and PE;

[0026] One or more voltage stabilizing capacitors are connected between the negative output terminal of the auxiliary switching power supply and PE to stabilize the voltage and prevent voltage fluctuations.

[0027] In a second aspect, the present invention provides an electric vehicle charging protection method, which uses the electric vehicle charging protection device according to the present invention, and the method includes the following steps:

[0028] When it is detected that the electric vehicle is connected to the charging pile, the second voltage is automatically collected and it is determined whether the second voltage is within the safe voltage range; if the second voltage is not within the safe voltage range, the detection is repeated and the determination is made whether the second voltage is within the safe voltage range; if the number of repeated detections reaches a preset number and the second voltage is still not within the safe voltage range, it is determined that the voltage state is continuously abnormal, the charging operation is suspended, and the charging pile fault information is reported; if the second voltage is within the safe voltage range, the charging connection operation is performed;

[0029] During charging, if it is detected that the second voltage is not within the standard voltage range but within the safe voltage range, and the duration exceeds the warning time threshold, charging will continue and the abnormal voltage fluctuation information of the charging pile will be reported; if it is detected that the second voltage is not within the safe voltage range and the duration of the voltage abnormality exceeds the safe time threshold, charging will be suspended and the charging pile voltage failure will be reported.

[0030] In a third aspect, a terminal according to the present invention includes a memory and a controller, wherein the memory stores a computer-readable program, and when the computer-readable program is called by the controller, it can execute the steps of the electric vehicle charging protection method according to the present invention.

[0031] In a fourth aspect, an electric vehicle according to the present invention adopts the electric vehicle charging protection device according to the present invention.

[0032] In a fifth aspect, a storage medium according to the present invention stores a computer-readable program therein, and when the computer-readable program is called, it can execute the steps of the electric vehicle charging protection method according to the present invention.

[0033] Beneficial effects of the present invention:

[0034] During the charging process of an electric vehicle through a charging pile, the present invention can not only effectively limit the power output of the auxiliary switching power supply to ensure the safety and controllability of the charging process, but also innovatively convert the traditional directly collected high voltage (such as the common 12V) into a safer low voltage (i.e., a second voltage, whose value is less than 12V) for detection. This design complies with the industry standard GBT18487.1 and sets a new benchmark for electric vehicle charging safety.

[0035] The core function of the voltage-divider and current-limiting module in this invention is that it can quickly respond and automatically limit current output when grid voltage fluctuates or when the auxiliary switching power supply itself experiences quality issues, effectively preventing safety hazards such as wiring harness ablation caused by unstable voltage or excessive current. Furthermore, by detecting the converted low voltage (the second voltage), the controller module can more accurately execute the charging control strategy, ensuring both efficient and safe charging.

[0036] In addition, when a voltage fault is detected at a charging pile, the fault information is reported to prevent damage to the electric vehicle's battery. When a voltage fluctuation is detected at a charging pile, abnormal voltage fluctuation information is reported, which can alert other electric vehicle users who have not adopted this electric vehicle charging protection device to avoid using the charging pile, thus achieving all-round protection for charging safety.

[0037] In summary, the electric vehicle charging protection device and charging protection method described in the present invention not only improve the safety and stability of the charging process, but also realize real-time monitoring and early warning of the charging pile status through intelligent and networked means, providing electric vehicle users with a more convenient and secure charging experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a structural diagram of the prior art;

[0039] Figure 2 This is the principle framework of the electric vehicle charging protection device described in the embodiment of this application. Figure 1 ;

[0040] Figure 3 This is the principle framework of the electric vehicle charging protection device described in the embodiment of this application. Figure 2 ;

[0041] Figure 4 This is the principle framework of the electric vehicle charging protection device described in the embodiment of this application. Figure 3 ;

[0042] Figure 5 This is a flowchart of an embodiment of the present application;

[0043] Figure 6 This is a flow chart of a method for calibrating a safe voltage range and a standard voltage range according to an embodiment of the present application;

[0044] Figure 7 This is a flow chart of a method for calibrating a warning time threshold according to an embodiment of the present application;

[0045] Figure 8 This is a specific flow chart of the electric vehicle charging protection method described in the embodiment of this application;

[0046] Figure 9 This is a principle block diagram of the terminal described in the embodiment of this application.

[0047] In the figure: 1- auxiliary switching power supply, 2- voltage divider and current limiting module, 21- first voltage divider and current limiting unit, 22- second voltage divider and current limiting unit, 23- current limiting resistor unit, 24- isolation inductor unit, 3- controller module, 4- vehicle body, 5- memory, 6- controller. DETAILED DESCRIPTION

[0048] The following will describe the embodiments of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art will be able to understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for the purpose of illustrating the present invention and are not intended to limit the scope of protection of the present invention.

[0049] like Figure 2 As shown, in an embodiment of the present application, an electric vehicle charging protection device includes a voltage-dividing and current-limiting module 2 connected between the output of an auxiliary switching power supply 1 and the input of a controller module 3. The voltage-dividing and current-limiting module 2 is configured to convert a first voltage output by the auxiliary switching power supply 1 into a second voltage and automatically limit the current output of the auxiliary switching power supply 1 when the grid voltage fluctuates or the auxiliary switching power supply 1 experiences an abnormality; the second voltage is less than the first voltage. The controller module 3 is configured to detect the second voltage and perform charging control or safety protection operations based on the second voltage.

[0050] like Figures 2 to 4 As shown, in a possible embodiment, the voltage-dividing and current-limiting module 2 includes a first voltage-dividing and current-limiting unit 21, a second voltage-dividing and current-limiting unit 22, a current-limiting resistor unit 23 and an isolation inductor unit 24. One end of the first voltage-dividing and current-limiting unit 21 is connected to the positive output end of the auxiliary switching power supply 1. The other end of the first voltage-dividing and current-limiting unit 21 is connected to the negative output end of the auxiliary switching power supply 1 after passing through the second voltage-dividing and current-limiting unit 22 and the current-limiting resistor unit 23 in sequence. The connection point between the second voltage-dividing and current-limiting unit 22 and the current-limiting resistor unit 23 is connected to PE (i.e., protective grounding) after passing through the isolation inductor unit 24. The connection point between the first voltage-dividing and current-limiting unit 21 and the second voltage-dividing and current-limiting unit 22 is connected to the input end of the controller module 3. It ensures that the current and voltage flow correctly inside the module, and at the same time, the setting of the isolation inductor unit 24 improves the anti-interference ability and safety of the circuit.

[0051] like Figure 2As shown, in one possible embodiment, the first voltage-dividing and current-limiting unit 21 includes at least one resistor, the second voltage-dividing and current-limiting unit 22 includes at least one resistor, the current-limiting resistor unit 23 includes at least one resistor, and the isolation inductor unit 24 includes at least one inductor. The power of the auxiliary switching power supply 1 is dissipated through the resistors.

[0052] like Figure 3 As shown, in one possible embodiment, the first voltage-dividing and current-limiting unit 21 includes at least one lamp, the second voltage-dividing and current-limiting unit 22 includes at least one resistor, the current-limiting resistor unit 23 includes at least one resistor, and the isolation inductor unit 24 includes at least one inductor. The power of the auxiliary switching power supply 1 is dissipated by the lamp. The lamp can be used in a heat dissipation lamp system.

[0053] like Figure 4 As shown, in one possible embodiment, the first voltage-dividing and current-limiting unit 21 includes at least one motor, the second voltage-dividing and current-limiting unit 22 includes at least one resistor, the current-limiting resistor unit 23 includes at least one resistor, and the isolation inductor unit 24 includes at least one inductor. The power of the auxiliary switching power supply 1 is dissipated by the motor. The motor can be used for ventilation and heat dissipation lighting systems in electric vehicles.

[0054] like Figures 2 to 4 As shown, in one possible embodiment, the resistance values ​​of the first voltage-dividing and current-limiting unit 21, the second voltage-dividing and current-limiting unit, and the current-limiting resistor unit 23 are all greater than 1000 ohms, and the ratio of the resistance values ​​of any two units does not exceed 2. By setting the resistance values ​​of the first voltage-dividing and current-limiting unit 21, the second voltage-dividing and current-limiting unit, and the current-limiting resistor unit 23 to be greater than 1000 ohms, the current is effectively limited, preventing overheating and damage caused by excessive current. The ratio of the resistance values ​​of any two units does not exceed 2. This design ensures relatively uniform voltage distribution in the circuit and avoids voltage instability caused by excessive resistance differences.

[0055] like Figures 2 to 4 As shown, in one possible embodiment, the resistance values ​​of the first voltage-divider and current-limiting unit 21, the second voltage-divider and current-limiting unit 22, and the current-limiting resistor unit 23 are equal. When the resistance values ​​of the first voltage-divider and current-limiting unit 21, the second voltage-divider and current-limiting unit 22, and the current-limiting resistor unit 23 are equal, the circuit design is simpler and more unified, reducing manufacturing costs and maintenance difficulties. Equal resistance values ​​also mean more uniform voltage drop and current distribution in the circuit, which helps improve the performance stability and reliability of the entire charging protection device.

[0056] like Figure 2 As shown, the following description is made by taking the first voltage-dividing and current-limiting unit 21 as the resistor R1, the second voltage-dividing and current-limiting unit 22 as the resistor R2, the current-limiting resistor unit 23 as the resistor R3, and R1=R2=R3=1.5KΩ as an example:

[0057] When this option is used, when the positive output terminal of the auxiliary switching power supply 1 (i.e., the A+ terminal of the auxiliary switching power supply 1) is 12V and the negative output terminal of the auxiliary switching power supply 1 (i.e., the A- terminal of the auxiliary switching power supply 1) is 0V, the voltage value of the second voltage (i.e., U1) detected by the controller module 3 is 6V (i.e., 12*R2 / (R1+R2)=12*1500 / 3000=6V). If there is a grid voltage fluctuation, for example: when the A+ terminal of the auxiliary switching power supply 1 is 8V and the A- terminal of the auxiliary switching power supply 1 is -4V, the sum of the voltages of the A+ terminal and the A- terminal of the auxiliary switching power supply 1 is 12V, and the U1 detected by the controller module 3 is 4V. At this time, the output current of the A- terminal of the auxiliary switching power supply 1 is 2.67mA (i.e., I=12 / (R1+R2+R3)=12 / 4500=2.67mA). According to the heat generation formula Q=I 2 RT, where Q represents heat, R represents the resistance of the wire connecting the A-terminal of the auxiliary switching power supply 1 and PE, and T represents the charging time. Since I is small, Q will not be large, which will not cause line abnormality.

[0058] like Figures 2 to 4 As shown, in a possible embodiment, an electric vehicle charging protection device further includes a voltage-stabilizing capacitor group, the voltage-stabilizing capacitor group includes at least one voltage-stabilizing capacitor, and its configuration includes at least one of the following situations:

[0059] One or more voltage-stabilizing capacitors are connected between the live wire and PE; one or more voltage-stabilizing capacitors are connected between the neutral wire and PE; one or more voltage-stabilizing capacitors are connected between the positive output terminal of the auxiliary switching power supply 1 and PE; and one or more voltage-stabilizing capacitors are connected between the negative output terminal of the auxiliary switching power supply 1 and PE. These are used to stabilize the voltage and prevent voltage fluctuations.

[0060] like Figures 2 to 4 As shown, the functions of each electronic component are described below:

[0061] Capacitor C1: voltage-stabilizing capacitor between L (live wire) and PE.

[0062] Capacitor C2: voltage-stabilizing capacitor between N (neutral line) and PE.

[0063] Capacitor C3: A voltage-stabilizing capacitor between the A+ terminal and PE of the auxiliary switching power supply 1.

[0064] Capacitor C4: A voltage stabilizing capacitor between the A- terminal and PE of the auxiliary switching power supply 1.

[0065] Resistor R1: Voltage divider and current limiting resistor used at the A+ terminal of auxiliary switching power supply 1.

[0066] Resistor R2: Voltage divider and current limiting resistor used at the A+ terminal of auxiliary switching power supply 1.

[0067] Resistor R3: Current limiting resistor used at the A- terminal of the auxiliary switching power supply 1.

[0068] Resistor L1: Isolates the inductor to prevent AC interference.

[0069] In an embodiment of the present application, a method for protecting charging of an electric vehicle is provided, which uses the electric vehicle charging protection device in the embodiment of the present application, and the method includes the following steps:

[0070] When it is detected that the electric vehicle is connected to the charging pile, the second voltage is automatically collected and it is determined whether the second voltage is within the safe voltage range; if the second voltage is not within the safe voltage range, the detection is repeated and it is determined whether the second voltage is within the safe voltage range; if the number of repeated detections reaches the preset number of times and the second voltage is still not within the safe voltage range, it is confirmed that the voltage status is continuously abnormal, the charging operation is suspended, and the charging pile fault information is reported; if the second voltage is within the safe voltage range, the charging connection operation is performed.

[0071] During charging, if the second voltage is detected to be outside the standard voltage range but within the safe voltage range, and the duration exceeds the warning time threshold, charging will continue and the abnormal voltage fluctuation of the charging pile will be reported. If the second voltage is detected to be outside the safe voltage range and the duration of the voltage abnormality exceeds the safety time threshold, charging will be suspended and a charging pile voltage fault will be reported.

[0072] like Figure 8 As shown, as an example, a charging protection method for an electric vehicle specifically includes the following steps:

[0073] Step 11: The electric vehicle is connected to the charging pile, and the controller module 3 detects the second voltage (ie, U1). The controller module 3 determines whether the voltage value of the second voltage is within the safe voltage range. If not, step 12 is executed, otherwise step 13 is executed.

[0074] Step 12: At 10-second intervals, perform three second voltage tests to determine whether the second voltage is within a safe voltage range. If it is still not within the safe voltage range after three tests, suspend charging and report a charging pile voltage fault to the user, which may cause system overvoltage and affect the life of the battery.

[0075] Step 13: The controller module 3 confirms that the current charger meets the charging start-up conditions and continues the charging connection.

[0076] Step 14: After completing the charging connection, the controller module 3 continues to detect the second voltage and determines whether the voltage value of the second voltage is within the standard voltage range. If so, charging continues; if not, proceeding to step 15.

[0077] Step 15: Determine whether the second voltage is within the safe voltage range and the duration exceeds the warning time threshold. If the second voltage is within the safe voltage range and the duration exceeds the warning time threshold, continue charging and report the abnormal voltage fluctuation of the charging pile. The abnormal voltage fluctuation of the charging pile may cause abnormal charging of the A-direct PE vehicle. By reporting to the cloud platform, the company is notified that other A-direct PE vehicles cannot charge on this charging pile; if not, proceed to step 16.

[0078] Step 16, determine whether the second voltage is within the safe voltage range and the duration exceeds the safe time threshold. If the second voltage is not within the safe voltage range and the duration exceeds the safe time threshold, charging is suspended, and the charging pile voltage fault is reported to the user, which may cause overvoltage and affect the life of the battery; if not, continue charging and continue to detect the second voltage.

[0079] like Figure 6 As shown, in the embodiment of the present application, the safe voltage range is (U1min, U1max), and the standard voltage range is (U1min standard, U1max standard). Among them, U1min, U1max, U1min standard, and U1max standard are all obtained by calibration. The specific process is as follows:

[0080] Step 21: Input the standard upper limit voltage, measure the voltage value of U1, and record the voltage value of U1.

[0081] Step 22: Input the standard lower limit voltage, measure the voltage value of U1, and record the voltage value of U1.

[0082] Step 23: Input the standard upper limit + N% voltage, measure the voltage value of U1, and record the voltage value of U1.

[0083] Step 24: Input the standard lower limit -N% voltage, measure the voltage value of U1, and record the voltage value of U1.

[0084] Step 25: Follow steps 11 to 14 to complete the output upper and lower limit voltage measurements of the auxiliary switching power supply 1 of several mainstream charging piles on the market.

[0085]

[0086] Step 26: Take the measurement of the upper and lower output voltages of the auxiliary switching power supply 1 of four mainstream charging piles in the market as an example:

[0087] Take the maximum value among U1maxstandard', U1maxstandard", U1maxstandard"' and U1maxstandard"" as U1maxstandard.

[0088] Take the minimum value among U1min标', U1min标", U1min标"' and U1min标"" as U1min标.

[0089] Take the maximum value among U1max', U1max", U1max"' and U1max"" as U1max.

[0090] Take the minimum value among U1min', U1min", U1min"' and U1min"" as U1min.

[0091] That is, the safe voltage range is (U1min, U1max), and the standard voltage range is (U1min standard, U1max standard).

[0092] like Figure 7 As shown, in a specific embodiment, the method for calibrating the warning time threshold is as follows:

[0093] Step 31:

[0094] 1. Use 0.35mm 2 Connect the A-terminal of the auxiliary switching power supply 1 to PE, input the standard upper limit voltage, and record the smoking time S1 of the wire.

[0095] 2. Use 0.5mm 2 Connect the A-terminal of the auxiliary switching power supply 1 and PE; input the standard upper limit voltage and record the smoking time S2 of the wire. ...

[0097] K, in Nmm 2 Connect the A-terminal of the auxiliary switching power supply 1 to PE; input the standard upper limit voltage and record the smoking time SK of the wire.

[0098] The recorded data is as follows:

[0099] Serial number Input voltage U1 voltage Wire diameter Puffing time 1 Standard upper limit voltage … <![CDATA[0.35mm 2 ]]> S1 2 Standard upper limit voltage … <![CDATA[0.5mm 2 ]]> S2 3 Standard upper limit voltage … … … … … … … … K Standard upper limit voltage … <![CDATA[Nmm 2 ]]> SK

[0100] Step 32:

[0101] 1. Use 0.35mm 2 Connect the A-terminal of the auxiliary switching power supply 1 and PE; input the standard lower limit voltage and record the smoking time S11 of the wire.

[0102] 2. Use 0.5mm 2 Connect the A-terminal of the auxiliary switching power supply 1 and PE; input the standard lower limit voltage and record the smoking time S12 of the wire. ...

[0104] K, in Nmm 2Connect the A-terminal of the auxiliary switching power supply 1 and PE; input the standard lower limit voltage and record the smoking time S1K of the wire.

[0105] The recorded data is as follows:

[0106] Serial number Input voltage U1 voltage Wire diameter Puffing time 1 Standard lower limit voltage … <![CDATA[0.35mm 2 ]]> S11 2 Standard lower limit voltage … <![CDATA[0.5mm 2 ]]> S12 3 Standard lower limit voltage … … … … … … … … K Standard lower limit voltage … <![CDATA[Nmm 2 ]]> S1K

[0107] Step 33: Take the minimum value of all wire smoke emission times as the warning time threshold.

[0108] like Figure 9 As shown, in an embodiment of the present application, a terminal includes a memory 5 and a controller 6, and the memory 5 stores a computer-readable program. When the computer-readable program is called by the controller 6, it can execute the steps of the electric vehicle charging protection method described in the embodiment of the present application.

[0109] In an embodiment of the present application, an electric vehicle adopts the electric vehicle charging protection device as described in the embodiment of the present application.

[0110] In an embodiment of the present application, a storage medium stores a computer-readable program, which, when called, can execute the steps of the electric vehicle charging protection method as described in the embodiment of the present application.

[0111] In an embodiment of the present application, the storage medium can be a tangible storage medium that can contain or store a program for use by an instruction execution system, device or equipment or used in combination with an instruction execution system, device or equipment. The storage medium can be a machine-readable signal storage medium or a machine-readable storage medium. The storage medium can include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. A more specific example of a storage medium can include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0112] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be considered as equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. An electric vehicle charging protection device, characterized in that: It comprises a voltage-dividing and current-limiting module (2), wherein the voltage-dividing and current-limiting module (2) is connected between the output end of the auxiliary switching power supply (1) and the input end of the controller module (3); The voltage dividing and current limiting module (2) is used to convert the first voltage output by the auxiliary switching power supply (1) into a second voltage, and automatically limit the current output of the auxiliary switching power supply (1) when the grid voltage fluctuates or the auxiliary switching power supply (1) is abnormal; wherein the value of the second voltage is smaller than the first voltage; The controller module (3) is used to detect the second voltage and perform charging control or safety protection operations according to the second voltage; The voltage-dividing and current-limiting module (2) comprises a first voltage-dividing and current-limiting unit (21), a second voltage-dividing and current-limiting unit (22), a current-limiting resistor unit (23) and an isolation inductor unit (24); One end of the first voltage-dividing and current-limiting unit (21) is connected to the positive output end of the auxiliary switching power supply (1); The other end of the first voltage-dividing and current-limiting unit (21) is connected to the negative output end of the auxiliary switching power supply (1) through the second voltage-dividing and current-limiting unit (22) and the current-limiting resistor unit (23) in sequence; The connection point between the second voltage-dividing and current-limiting unit (22) and the current-limiting resistor unit (23) is connected to PE via the isolation inductor unit (24); The connection point between the first voltage-dividing and current-limiting unit (21) and the second voltage-dividing and current-limiting unit (22) is connected to the input end of the controller module (3).

2. The electric vehicle charging protection device according to claim 1, characterized in that: The first voltage-dividing and current-limiting unit (21) includes at least one resistor, or a lamp, or a motor; The second voltage-dividing and current-limiting unit (22) comprises at least one resistor; The current limiting resistor unit (23) includes at least one resistor; The isolation inductor unit (24) includes at least one inductor.

3. The electric vehicle charging protection device according to claim 2, characterized in that: The resistance values ​​of the first voltage-dividing and current-limiting unit (21), the second voltage-dividing and current-limiting unit (22), and the current-limiting resistor unit (23) are all greater than 1000 ohms, and the ratio of the resistance values ​​of any two units does not exceed 2.

4. The electric vehicle charging protection device according to claim 3, characterized in that: The resistance values ​​of the first voltage-dividing and current-limiting unit (21), the second voltage-dividing and current-limiting unit (22), and the current-limiting resistor unit (23) are equal.

5. The electric vehicle charging protection device according to claim 1, characterized in that: The invention also includes a voltage-stabilizing capacitor group, wherein the voltage-stabilizing capacitor group includes at least one voltage-stabilizing capacitor, and the configuration method thereof includes at least one of the following situations: Connect one or more voltage-stabilizing capacitors between the live wire and PE; Connect one or more voltage stabilizing capacitors between the neutral line and PE; One or more voltage stabilizing capacitors are connected between the positive output terminal of the auxiliary switching power supply (1) and PE; One or more voltage stabilizing capacitors are connected between the negative output terminal of the auxiliary switching power supply (1) and PE.

6. A method for protecting charging of an electric vehicle, characterized in that: The electric vehicle charging protection device according to any one of claims 1 to 5 is used, and the method includes the following steps: When it is detected that the vehicle is connected to the charging pile, the second voltage is automatically collected and it is determined whether the second voltage is within the safe voltage range; if the second voltage is not within the safe voltage range, the detection is repeated and the determination is made whether the second voltage is within the safe voltage range; if the number of repeated detections reaches a preset number and the second voltage is still not within the safe voltage range, it is determined that the voltage status is continuously abnormal, the charging operation is suspended, and the charging pile fault information is reported; if the second voltage is within the safe voltage range, the charging connection operation is performed; During charging, if it is detected that the second voltage is not within the standard voltage range but within the safe voltage range, and the duration exceeds the warning time threshold, charging will continue and the abnormal voltage fluctuation information of the charging pile will be reported; if it is detected that the second voltage is not within the safe voltage range and the duration of the voltage abnormality exceeds the safe time threshold, charging will be suspended and the charging pile voltage failure will be reported.

7. A terminal, characterized in that: The invention comprises a memory (5) and a controller (6), wherein the memory (5) stores a computer-readable program, and when the computer-readable program is called by the controller (6), the steps of the electric vehicle charging protection method as claimed in claim 6 can be executed.

8. An electric vehicle, characterized in that: An electric vehicle charging protection device as described in any one of claims 1 to 5 is used.

9. A storage medium, characterized in that: A computer-readable program is stored therein, and when the computer-readable program is called, the steps of the electric vehicle charging protection method as claimed in claim 6 can be executed.

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