Electric vehicle charging control method, device, system and storage medium

Abstract

The application discloses an electric vehicle charging control method, device and system and a storage medium. It relates to the field of electric vehicle control. The method comprises the following steps: acquiring a connection voltage signal between a gun seat and a charging gun on an electric vehicle; comparing the connection voltage signal with a reference voltage signal through a voltage comparison circuit to obtain a voltage output result of the voltage comparison circuit; and sending the voltage output result to a direct current contactor to control the charging state of the electric vehicle through the direct current contactor, wherein the charging state is to end charging or continue charging, and the direct current contactor is arranged between the gun seat and a direct current charger. The application solves the technical problem of slow interface cutting speed and high risk of arc in the related art caused by the program judgment mode for electric vehicle charging state control.

Description

Technical Field

[0001] This invention relates to the field of electric vehicle control, and more specifically, to an electric vehicle charging control method, apparatus, system, and storage medium. Background Technology

[0002] Existing DC chargers use high-voltage DC output contactors to control the opening and closing of the charging interface. The opening and closing of the DC output contactor is controlled by the energization or de-energization of its coil. The DC contactor coil circuit is controlled by the charger controller system. If the charging interface is suddenly disconnected, the charger control system needs to receive the connection signal sampling status of the charging gun and gun holder. After program judgment, a relay disconnection command is sent to the control coil circuit. The relay disconnects through the control circuit, the DC output contactor coil is de-energized, and the DC output contactor disconnects. From the abnormal connection signal of the charging gun and gun holder to the charger disconnecting and the DC output contactor disconnecting, it takes about 45ms. However, the time for a person to quickly pull out the gun is 23ms. That is, when the gun head and gun holder are separated, the charger DC output contactor has not disconnected. The charging gun head carries a large amount of electrical energy, which can easily cause arcing.

[0003] There is currently no effective solution to the above problems. Summary of the Invention

[0004] This invention provides an electric vehicle charging control method, device, system, and storage medium to at least solve the technical problems of slow interface disconnection speed and high risk of arcing caused by controlling the charging status of electric vehicles through program judgment in related technologies.

[0005] According to one aspect of the present invention, an electric vehicle charging control method is provided, comprising: acquiring a connection voltage signal between a charging gun holder and a charging gun on an electric vehicle; comparing the connection voltage signal with a reference voltage signal through a voltage comparison circuit to obtain a voltage output result of the voltage comparison circuit; sending the voltage output result to a DC contactor, and controlling the charging state of the electric vehicle through the DC contactor, wherein the charging state is: ending charging or continuing charging, and the DC contactor is disposed between the charging gun holder and the DC charger.

[0006] According to another aspect of the present invention, an electric vehicle charging control system is also provided, comprising: a main control device and a power supply circuit, the power supply circuit comprising: a voltage comparison circuit and a DC contactor, wherein the main control device is used to acquire a connection voltage signal between the charging gun holder and the charging gun on the electric vehicle, and send the connection voltage signal to the voltage comparison circuit; the voltage comparison circuit is connected to the main control device and is used to compare the connection voltage signal with a reference voltage signal to obtain the voltage output result of the voltage comparison circuit; the DC contactor is connected to the voltage comparison circuit, connected to the charging gun and the DC charger, and disposed between the charging gun and the DC charger, and is used to control the charging state of the electric vehicle, wherein the charging state is: end of charging or continue charging.

[0007] According to another aspect of the present invention, an electric vehicle charging control device is also provided, comprising: an acquisition module for acquiring a connection voltage signal between a charging gun holder and a charging gun on an electric vehicle; a comparison module for comparing the connection voltage signal with a reference voltage signal through a voltage comparison circuit to obtain a voltage output result of the voltage comparison circuit; and a control module for sending the voltage output result to a DC contactor to control the charging state of the electric vehicle through the DC contactor, wherein the charging state is: ending charging or continuing charging, and the DC contactor is disposed between the charging gun holder and the DC charger.

[0008] According to another aspect of the present invention, a non-volatile storage medium is also provided, the non-volatile storage medium storing a plurality of instructions adapted for loading by a processor and executing any one of the electric vehicle charging control methods described herein.

[0009] According to another aspect of the present invention, an electronic device is also provided, including one or more processors and a memory, the memory being used to store one or more programs, wherein when the one or more programs are executed by the one or more processors, the one or more processors cause the one or more processors to implement any one of the electric vehicle charging control methods.

[0010] In this embodiment of the invention, the connection voltage signal between the charging gun holder and the charging gun on the electric vehicle is acquired; the connection voltage signal is compared with a reference voltage signal by a voltage comparison circuit to obtain the voltage output result of the voltage comparison circuit; the voltage output result is sent to a DC contactor, and the charging state of the electric vehicle is controlled by the DC contactor, wherein the charging state is: end of charging or continue charging. The DC contactor is located between the charging gun holder and the DC charger, achieving direct control of the DC contactor through the voltage comparison circuit, so as to realize the purpose of rapid disconnection of the charging interface under specific conditions. This achieves the technical effect of improving the disconnection speed of the charging interface and reducing the risk of arcing, thereby solving the technical problem of slow interface disconnection speed and high risk of arcing caused by controlling the charging state of electric vehicles by program judgment in related technologies. Attached Figure Description

[0011] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0012] Figure 1 This is a schematic diagram of an electric vehicle charging control method according to an embodiment of the present invention;

[0013] Figure 2 This is an optional charging system control principle diagram according to an embodiment of the present invention;

[0014] Figure 3 This is a schematic diagram of an optional voltage comparison circuit structure according to an embodiment of the present invention;

[0015] Figure 4 This is a schematic diagram of an optional electric vehicle charging control method according to an embodiment of the present invention;

[0016] Figure 5 This is a schematic diagram of an electric vehicle charging control system according to an embodiment of the present invention;

[0017] Figure 6 This is a schematic diagram of an electric vehicle charging control device according to an embodiment of the present invention. Detailed Implementation

[0018] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0019] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0020] A DC charger connects to the charging gun socket of an electric vehicle via a charging gun. During charging, energy is transferred through this connection device (charging gun). In related technologies, when charging stops, the charger controls the charging module to shut down, the output current drops below 5A (amperes), the charger disconnects the output DC contactor switches K1 and K2, the charging gun electronic lock unlocks, and the user removes the gun. At this point, the charging interface has no power. If the interface suddenly disconnects during energy transfer, the DC charger typically outputs high voltage, such as hundreds or thousands of volts. Removing the gun while it's energized will cause an electric arc between the high voltages. The DC charger outputs high current, typically hundreds or even thousands of amperes. Removing the gun while it's energized will cause an electric arc between the high currents. The faster the gun is removed while energized, the faster the current disconnects, increasing the likelihood of an electric arc and reducing safety.

[0021] The supercharging interface operates at 1000V and has a maximum current of 600A, significantly increasing the risks of arcing, insulation breakdown, and pin burning compared to traditional DC charging interfaces (750V, 250A). Furthermore, the connector has been reduced from 9 pins to 7, and the electronic lock control is located on the vehicle side. If the electronic lock fails, the risk of arcing caused by the user plugging and unplugging while the circuit is energized will be greatly increased. In the same amount of time, the arc energy of a DC charger is proportional to the product of voltage and current; the arc energy of a high-power supercharging system is more than three times that of a regular DC charger, posing a greater safety risk.

[0022] According to an embodiment of the present invention, a method embodiment for electric vehicle charging control is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0023] Figure 1 This is a flowchart of an electric vehicle charging control method according to an embodiment of the present invention, such as... Figure 1 As shown, the method includes the following steps:

[0024] Step S102: Obtain the connection voltage signal between the charging gun holder and the charging gun on the electric vehicle;

[0025] Step S104: The connected voltage signal is compared with the reference voltage signal through the voltage comparison circuit to obtain the voltage output result of the voltage comparison circuit;

[0026] Step S106: The voltage output result is sent to the DC contactor, and the charging status of the electric vehicle is controlled by the DC contactor. The charging status is either "end charging" or "continue charging". The DC contactor is located between the charging gun and the DC charger.

[0027] Optionally, the aforementioned DC contactor is positioned between the charging gun holder and the DC charger to control the connection status between them, i.e., the charging status of the electric vehicle. The output signal of the aforementioned voltage comparison circuit can serve as the power supply signal for the DC contactor. The voltage output of the aforementioned voltage comparison circuit is either a high-level signal or a low-level signal, used to control the on / off state of the DC contactor. When the voltage output of the voltage comparison circuit is high, the DC contactor is in the connected state, the charging gun holder and the DC charger remain connected, and the corresponding charging status of the electric vehicle is "continuing to charge". When the voltage output of the voltage comparison circuit is low, the DC contactor is directly disconnected, the connection between the charging gun holder and the DC charger is broken, and the corresponding charging status of the electric vehicle is "charging stopped". In this way, when a disconnection of the charging interface is detected, the DC output contactor of the charger is directly disconnected without program control. Since the DC contactor has the capacity to break under load, it can quickly cut off the output circuit, allowing the energy to drop rapidly when the charging gun head and the charging gun holder are completely separated, thus avoiding the risk of arcing.

[0028] In one optional embodiment, sending the voltage output result to a DC contactor and controlling the charging state of the electric vehicle via the DC contactor includes: sending the voltage output result to the DC contactor; determining the connection state of the DC contactor based on the voltage output result, wherein the connection state is either an on or off state; and controlling the charging state of the electric vehicle based on the connection state of the DC contactor.

[0029] Optionally, the voltage output of the voltage comparison circuit can be used as the on / off control signal of the DC contactor, directly controlling the on / off state of the DC contactor without the need for complex program control. That is, when the voltage output is a high-level signal, the DC contactor continues to operate normally; when the voltage output is a low-level signal, the DC contactor is directly controlled to disconnect, without the need for complex programs, thus reducing the risk of arcing.

[0030] Optionally, the charging status of the electric vehicle can be determined based on the connection status of the DC contactor, including: using the voltage output result as the power input signal for the DC contactor to control its connection status. That is, the voltage output result can be directly used as the power input signal for the DC contactor. When the voltage output result is a high-level signal, the power input signal for the DC contactor remains, and the DC contactor continues to operate normally. When the voltage output result is a low-level signal, the power input signal for the DC contactor disappears, and the DC contactor disconnects and cannot operate normally.

[0031] In one optional embodiment, determining the connection state of the DC contactor based on the voltage output result includes: controlling the DC contactor to be in a conducting state when the voltage output result is a first voltage signal; and controlling the DC contactor to be in a turning-off state when the voltage output result is a second voltage signal, wherein the voltage amplitude of the first voltage signal is greater than the voltage amplitude of the second voltage signal.

[0032] Optionally, the voltage value corresponding to the aforementioned reference voltage signal can be 5V. The voltage comparison circuit compares the connection voltage signal with the reference voltage signal to obtain the voltage output result of the voltage comparison circuit. This includes: when the connection voltage signal is normal, that is, when the voltage corresponding to the connection voltage signal is a preset first voltage value (e.g., 4V), the connection voltage signal and the reference voltage value are input to the voltage comparison circuit, and the obtained voltage output result is: the first voltage signal (i.e., a high-level signal); when the connection voltage signal is abnormal, that is, when the voltage corresponding to the connection voltage signal is in a preset first voltage range (e.g., between 6V and 12V), the connection voltage signal and the reference voltage value are input to the voltage comparison circuit, and the obtained voltage output result is: the second voltage signal (i.e., a low-level signal). Figure 2 This is an optional charging system control principle diagram according to an embodiment of the present invention. UN represents the voltage output result. The positive DC+ and negative DC- output of the DC charger are connected to the charging gun via DC contactor switches K1 and K2. The closing and opening of DC contactors K1 and K2 are controlled by whether their contactor coils A1 and A2 are energized. When contactor coils A1 and A2 are energized, DC contactors K1 and K2 are closed. When A1 and A2 are de-energized, DC contactors K1 and K2 are open.

[0033] In the coil control circuit (equivalent to the contactor coil power supply circuit), the voltage output UN outputs a 12V power supply, and DO is the interface opened by the control system (i.e., the main control equipment). According to the charging process standard requirements, the control system closes and opens DO to control coils A1 and A2 to be energized or de-energized, so as to control DC contactors K1 and K2 to be closed or opened.

[0034] In one optional embodiment, the voltage comparison circuit includes: a voltage comparator, a first transistor, a second transistor, a first resistor, and a second resistor. The positive input terminal of the voltage comparator is used to connect to a reference voltage signal, the negative input terminal of the voltage comparator is used to connect to a connection voltage signal, the output terminal of the voltage comparator is connected to one end of the first resistor, the other end of the first resistor is connected to the base of the first transistor, the emitter of the first transistor is connected to ground, the collector of the first transistor is connected to one end of the second resistor, the other end of the second resistor is connected to the base of the second transistor, the emitter of the second transistor is connected to a preset third voltage signal, and the collector of the second transistor is connected to ground.

[0035] Optional, Figure 3 This is a schematic diagram of an optional voltage comparison circuit structure according to an embodiment of the present invention, such as... Figure 3 As shown, the voltage comparison circuit includes a voltage comparator U1, a first transistor Q1, a second transistor Q2, a first resistor R17, and a second resistor R18. The reference voltage is connected to the positive input terminal of the voltage comparator, and the voltage output CC1 is connected to the negative input terminal of the voltage comparator. When... Figure 2 When the charging gun and gun holder are properly connected, the connection confirmation signal CC1 sampled by the control system has a normal voltage, i.e., 4V. This voltage is compared with the reference voltage 5V by voltage comparator U1, resulting in a high-level signal output. The base of Q1 is connected to this high-level signal via R17, and its emitter is grounded, thus Q1 conducts. The emitter of Q2 is connected to a 12V power supply, and its base is grounded via R18 and the conducting Q1, thus Q2 conducts. The on-state voltage drop is 0.3V, resulting in an output voltage UN of +11.7V. The control system can then normally control the DC output contactors K1 and K2 via DO. When... Figure 2 When the connection between the charging gun and the charging base is abnormal, the connection confirmation signal CC1 sampled by the control system has a voltage of 6V-12V. This voltage is compared with the reference voltage of 5V by voltage comparator U1, resulting in a low-level signal output. The base of Q1 is connected to this low-level signal via R17, and its emitter is grounded, preventing Q1 from conducting. The emitter of Q2 is connected to a 12V power supply, and its base cannot be connected to GND via R18, thus preventing Q2 from conducting. Therefore, the output voltage UN is 0V. Figure 2 A1 and A2 quickly lose power, then K1 and K2 disconnect, and the charging gun's energy drops rapidly.

[0036] In an optional embodiment, the voltage comparison circuit further includes a third resistor, through which the collector of the second transistor is connected to ground. Still as Figure 3 As shown, a third resistor R19 is placed between the collector Q2 of the second transistor and the ground terminal GND to protect the circuit.

[0037] Through the above steps S102 to S106, the DC contactor can be directly controlled through the voltage comparison circuit to achieve the purpose of rapid disconnection of the charging interface under specific conditions. This achieves the technical effect of improving the disconnection speed of the charging interface and reducing the risk of arcing, thereby solving the technical problem of slow interface disconnection speed and high risk of arcing caused by controlling the charging status of electric vehicles through program judgment in related technologies.

[0038] Based on the above embodiments and optional embodiments, the present invention proposes an optional implementation method. Figure 4 This is a flowchart of an optional electric vehicle charging control method according to an embodiment of the present invention, such as... Figure 4 As shown, the method includes:

[0039] Step S1: The control system (i.e., the main control device) acquires the connection voltage signal between the charging gun head and the gun holder through its acquisition circuit.

[0040] Step S2: The acquired connection voltage signal is compared with the reference voltage through a voltage comparator circuit to obtain the voltage output result;

[0041] Step S3: Determine whether the voltage output result is normal (i.e., whether it is a high-level signal);

[0042] Step S4: If the voltage output result is a high-level signal, then a logic AND gate is used to judge the power supply signal of the contactor coil power supply circuit. If the power supply signal is output normally, the DC contactor is powered and the charging process continues to charge the electric vehicle normally until the charging is completed.

[0043] Step S5: If the voltage output result is a low-level signal, then a logic AND gate is used to judge the power supply signal of the contactor coil power supply circuit. If the power supply signal disappears, the contactor coil power supply circuit loses power, the DC contactor coil is disconnected, and the electric vehicle stops charging.

[0044] In this way, the connection status of the charging gun head and the gun holder directly controls the DC contactor of the charger. When the connection between the charger gun and the vehicle gun holder is abnormal, the charger will immediately disconnect the DC contactor switch as quickly as possible without requiring diagnostic procedures. This allows the energy in the charging gun head to decrease rapidly, ensuring the safety of equipment and personnel. Testing has shown that the contactor can disconnect within 10mm, meaning that the charger's DC output contactor has already disconnected when the gun head and the gun holder separate, rapidly reducing the energy in the charging gun head and avoiding the risk of arcing.

[0045] According to an embodiment of the present invention, a system embodiment for implementing the above-described electric vehicle charging control method is also provided. Figure 5 This is a schematic diagram of the structure of an electric vehicle charging control system according to an embodiment of the present invention, as shown below. Figure 5 As shown, the above-mentioned electric vehicle charging control system includes: a main control device 50 and a power supply circuit 52. The power supply circuit 52 includes: a voltage comparison circuit 520 and a DC contactor 522.

[0046] The main control device 50 is used to collect the connection voltage signal between the gun holder and the charging gun on the electric vehicle, and send the connection voltage signal to the voltage comparison circuit 520.

[0047] The voltage comparison circuit 520 is connected to the main control device 50 and is used to compare the connected voltage signal with the reference voltage signal to obtain the voltage output result of the voltage comparison circuit 520.

[0048] The DC contactor 522 is connected to the voltage comparison circuit 520, the charging gun, and the DC charger. It is located between the charging gun and the DC charger and is used to control the charging status of the electric vehicle. The charging status is either "end charging" or "continue charging".

[0049] In this embodiment of the invention, a main control device 50 and a power supply circuit 52 are set in the electric vehicle charging control. The power supply circuit 52 includes a voltage comparison circuit 520 and a DC contactor 522. The main control device 50 is used to collect the connection voltage signal between the charging gun holder and the charging gun on the electric vehicle and send the connection voltage signal to the voltage comparison circuit 520. The voltage comparison circuit 520 is connected to the main control device 50 and is used to compare the connection voltage signal with a reference voltage signal to obtain the voltage output result of the voltage comparison circuit 520. The DC contactor 522 is connected to the voltage comparison circuit 520 and the charging gun and the DC charger, and is set between the charging gun and the DC charger to control the charging state of the electric vehicle. The charging state is either "end charging" or "continue charging". This achieves the goal of directly controlling the DC contactor through the voltage comparison circuit to quickly disconnect the charging interface under certain conditions. This improves the charging interface disconnection speed and reduces the risk of arcing, thereby solving the technical problems of slow interface disconnection speed and high arcing risk caused by program judgment in related technologies for controlling the charging state of electric vehicles.

[0050] Optionally, the aforementioned DC contactor is positioned between the charging gun holder and the DC charger to control the connection status between them, i.e., the charging status of the electric vehicle. The output signal of the aforementioned voltage comparison circuit can serve as the power supply signal for the DC contactor. The voltage output of the aforementioned voltage comparison circuit is either a high-level signal or a low-level signal, used to control the on / off state of the DC contactor. When the voltage output of the voltage comparison circuit is high, the DC contactor is in the connected state, the charging gun holder and the DC charger remain connected, and the corresponding charging status of the electric vehicle is "continuing to charge". When the voltage output of the voltage comparison circuit is low, the DC contactor is directly disconnected, the connection between the charging gun holder and the DC charger is broken, and the corresponding charging status of the electric vehicle is "charging stopped". In this way, when a disconnection of the charging interface is detected, the DC output contactor of the charger is directly disconnected without program control. Since the DC contactor has the capacity to break under load, it can quickly cut off the output circuit, allowing the energy to drop rapidly when the charging gun head and the charging gun holder are completely separated, thus avoiding the risk of arcing.

[0051] Optionally, the voltage value corresponding to the aforementioned reference voltage signal can be 5V. The voltage comparison circuit compares the connection voltage signal with the reference voltage signal to obtain the voltage output result of the voltage comparison circuit. This includes: when the connection voltage signal is normal, i.e., the voltage corresponding to the connection voltage signal is a preset first voltage value (e.g., 4V), the connection voltage signal and the reference voltage value are input to the voltage comparison circuit, and the obtained voltage output result is: a first voltage signal (i.e., a high-level signal); when the connection voltage signal is abnormal, i.e., the voltage corresponding to the connection voltage signal is within a preset first voltage range (e.g., between 6V and 12V), the connection voltage signal and the reference voltage value are input to the voltage comparison circuit, and the obtained voltage output result is: a second voltage signal (i.e., a low-level signal). Figure 2 As shown, UN represents the voltage output result. The positive DC+ and negative DC- output of the DC charger are connected to the charging gun via DC contactor switches K1 and K2. The opening and closing of DC contactors K1 and K2 are controlled by whether their contactor coils A1 and A2 are energized. When contactor coils A1 and A2 are energized, DC contactors K1 and K2 are closed. When A1 and A2 are de-energized, DC contactors K1 and K2 are open.

[0052] In the coil control circuit (equivalent to the contactor coil power supply circuit), UN outputs a 12V power supply, and DO is the interface opened by the control system (i.e., the main control equipment). According to the charging process standard requirements, the control system closes and opens DO to control coils A1 and A2 to be energized or de-energized, so as to control DC contactors K1 and K2 to close or open.

[0053] In one optional embodiment, the voltage comparison circuit includes: a voltage comparator, a first transistor, a second transistor, a first resistor, and a second resistor. The positive input terminal of the voltage comparator is used to connect to a reference voltage signal, the negative input terminal of the voltage comparator is used to connect to a connection voltage signal, the output terminal of the voltage comparator is connected to one end of the first resistor, the other end of the first resistor is connected to the base of the first transistor, the emitter of the first transistor is connected to ground, the collector of the first transistor is connected to one end of the second resistor, the other end of the second resistor is connected to the base of the second transistor, the emitter of the second transistor is connected to a preset third voltage signal, and the collector of the second transistor is connected to ground.

[0054] Optional, as before Figure 3 As shown, the voltage comparison circuit includes a voltage comparator U1, a first transistor Q1, a second transistor Q2, a first resistor R17, and a second resistor R18. The reference voltage is connected to the positive input terminal of the voltage comparator, and the voltage output CC1 is connected to the negative input terminal of the voltage comparator. When... Figure 2When the charging gun and gun holder are properly connected, the connection confirmation signal CC1 sampled by the control system has a normal voltage, i.e., 4V. This voltage is compared with the reference voltage 5V by voltage comparator U1, resulting in a high-level signal output. The base of Q1 is connected to this high-level signal via R17, and its emitter is grounded, thus Q1 conducts. The emitter of Q2 is connected to a 12V power supply, and its base is grounded via R18 and the conducting Q1, thus Q2 conducts. The on-state voltage drop is 0.3V, resulting in an output voltage UN of +11.7V. The control system can then normally control the DC output contactors K1 and K2 via DO. When... Figure 2 When the connection between the charging gun and the charging base is abnormal, the connection confirmation signal CC1 sampled by the control system has a voltage of 6V-12V. This voltage is compared with the reference voltage of 5V by voltage comparator U1, resulting in a low-level signal output. The base of Q1 is connected to this low-level signal via R17, and its emitter is grounded, preventing Q1 from conducting. The emitter of Q2 is connected to a 12V power supply, and its base cannot be connected to GND via R18, thus preventing Q2 from conducting. Therefore, the output voltage UN is 0V. Figure 2 A1 and A2 quickly lose power, then K1 and K2 disconnect, and the charging gun's energy drops rapidly.

[0055] In an optional embodiment, the voltage comparison circuit further includes a third resistor, through which the collector of the second transistor is connected to ground. Still as Figure 3 As shown, a third resistor R19 is placed between the collector Q2 of the second transistor and the ground terminal GND to protect the circuit.

[0056] It should be noted that in this application Figure 5 The specific structure of the electric vehicle charging control system shown is merely illustrative. In practical applications, the electric vehicle charging control system in this application can be more advanced than... Figure 5 The electric vehicle charging control system shown has more or less structure.

[0057] It should be noted that any optional or preferred electric vehicle charging control method in the above method embodiments can be executed or implemented in the electric vehicle charging control system provided in this embodiment.

[0058] Furthermore, it should be noted that the optional or preferred implementation methods of this embodiment can be found in the relevant descriptions in the method embodiments, which will not be repeated here.

[0059] This embodiment also provides an electric vehicle charging control device for implementing the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the terms "module" and "device" can refer to a combination of software and / or hardware that performs a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0060] According to an embodiment of the present invention, an apparatus embodiment for implementing the above-described electric vehicle charging control method is also provided. Figure 6 This is a schematic diagram of the structure of an electric vehicle charging control device according to an embodiment of the present invention, as shown below. Figure 6 As shown, the above-mentioned electric vehicle charging control device includes: an acquisition module 600, a comparison module 602, and a control module 604, wherein:

[0061] The aforementioned acquisition module 600 is used to acquire the connection voltage signal between the charging gun holder and the charging gun on the electric vehicle;

[0062] The comparison module 602 is connected to the acquisition module 600 and is used to compare the connected voltage signal with the reference voltage signal through the voltage comparison circuit to obtain the voltage output result of the voltage comparison circuit.

[0063] The control module 604 is connected to the comparison module 602 and is used to send the voltage output result to the DC contactor to control the charging status of the electric vehicle. The charging status is either "end charging" or "continue charging". The DC contactor is located between the charging gun and the DC charger.

[0064] In this embodiment of the invention, the acquisition module 600 is configured to acquire the connection voltage signal between the charging gun holder and the charging gun on the electric vehicle; the comparison module 602, connected to the acquisition module 600, is configured to compare the connection voltage signal with the reference voltage signal through a voltage comparison circuit to obtain the voltage output result of the voltage comparison circuit; the control module 604, connected to the comparison module 602, is configured to send the voltage output result to the DC contactor to control the charging state of the electric vehicle through the DC contactor, wherein the charging state is: end of charging or continue charging. The DC contactor is located between the charging gun holder and the DC charger, achieving direct control of the DC contactor through the voltage comparison circuit to achieve the purpose of rapid disconnection of the charging interface under specific conditions. This achieves the technical effect of improving the disconnection speed of the charging interface and reducing the risk of arcing, thereby solving the technical problem of slow interface disconnection speed and high risk of arcing caused by controlling the charging state of electric vehicles through program judgment in related technologies.

[0065] It should be noted that the above modules can be implemented by software or hardware. For example, for the latter, it can be implemented in the following ways: the above modules can be located in the same processor; or the above modules can be located in different processors in any combination.

[0066] It should be noted that the acquisition module 600, comparison module 602, and control module 604 mentioned above correspond to steps S102 to S106 in the embodiments. The instances and application scenarios implemented by the above modules and their corresponding steps are the same, but they are not limited to the content disclosed in the above embodiments. It should also be noted that the above modules, as part of the device, can run in a computer terminal.

[0067] It should be noted that the optional or preferred implementation methods of this embodiment can be found in the relevant descriptions in the embodiments, and will not be repeated here.

[0068] The electric vehicle charging control device described above may also include a processor and a memory. The acquisition module 600, comparison module 602, control module 604, etc., are all stored in the memory as program modules, and the processor executes the program modules stored in the memory to realize the corresponding functions.

[0069] The processor contains a core that retrieves the corresponding program modules from memory. One or more cores may be configured. Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory includes at least one memory chip.

[0070] According to an embodiment of this application, an embodiment of a non-volatile storage medium is also provided. Optionally, in this embodiment, the non-volatile storage medium includes a stored program, wherein, when the program is running, it controls the device containing the non-volatile storage medium to execute any of the electric vehicle charging control methods described above.

[0071] Optionally, in this embodiment, the non-volatile storage medium may be located in any computer terminal in a group of computer terminals in a computer network, or in any mobile terminal in a group of mobile terminals, and the non-volatile storage medium includes stored programs.

[0072] Optionally, during program execution, the device containing the non-volatile storage medium is controlled to perform the following functions: acquire the connection voltage signal between the charging gun holder and the charging gun on the electric vehicle; compare the connection voltage signal with the reference voltage signal through a voltage comparison circuit to obtain the voltage output result of the voltage comparison circuit; send the voltage output result to the DC contactor, and control the charging state of the electric vehicle through the DC contactor, wherein the charging state is: end charging or continue charging, and the DC contactor is located between the charging gun holder and the DC charger.

[0073] According to an embodiment of this application, an embodiment of a processor is also provided. Optionally, in this embodiment, the processor is used to run a program, wherein the program executes any of the above-described electric vehicle charging control methods.

[0074] According to an embodiment of this application, an embodiment of a computer program product is also provided, which, when executed on a data processing device, is adapted to execute a program that initializes the electric vehicle charging control method steps described above.

[0075] Optionally, when the above-mentioned computer program product is executed on a data processing device, it is suitable to execute an initialization program with the following method steps: acquiring the connection voltage signal between the charging gun holder and the charging gun on the electric vehicle; comparing the connection voltage signal with a reference voltage signal through a voltage comparison circuit to obtain the voltage output result of the voltage comparison circuit; sending the voltage output result to a DC contactor to control the charging state of the electric vehicle through the DC contactor, wherein the charging state is: end of charging or continue charging, and the DC contactor is located between the charging gun holder and the DC charger.

[0076] This invention provides an electronic device, which includes a processor, a memory, and a program stored in the memory and executable on the processor. When the processor executes the program, it performs the following steps: acquiring the connection voltage signal between the charging gun holder and the charging gun on the electric vehicle; comparing the connection voltage signal with a reference voltage signal through a voltage comparison circuit to obtain the voltage output result of the voltage comparison circuit; sending the voltage output result to a DC contactor to control the charging state of the electric vehicle, wherein the charging state is: ending charging or continuing charging, and the DC contactor is located between the charging gun holder and the DC charger.

[0077] The order of the above embodiments of the present invention is merely for description and does not represent the superiority or inferiority of the embodiments.

[0078] In the above embodiments of the present invention, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0079] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of modules described above can be a logical functional division, and in actual implementation, there may be other division methods. For example, multiple modules or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, or indirect coupling or communication connection between modules, and may be electrical or other forms.

[0080] The modules described above as separate components may or may not be physically separate. Similarly, the components shown as modules may or may not be physical modules; they may be located in one place or distributed across multiple modules. Some or all of the modules can be selected to achieve the purpose of this embodiment, depending on actual needs.

[0081] Furthermore, the functional modules in the various embodiments of the present invention can be integrated into one processing module, or each module can exist physically separately, or two or more modules can be integrated into one module. The integrated modules described above can be implemented in hardware or as software functional modules.

[0082] If the aforementioned integrated modules are implemented as software functional modules and sold or used as independent products, they can be stored in a computer-readable non-volatile storage medium. Based on this understanding, the technical solution of this invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a non-volatile storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this invention. The aforementioned non-volatile storage medium includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0083] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for controlling the charging of an electric vehicle, characterized in that, include: Obtain the connection voltage signal between the charging gun mount and the charging gun on the electric vehicle; The voltage output result of the voltage comparison circuit is obtained by comparing the connected voltage signal with the reference voltage signal through a voltage comparison circuit. The voltage output result is sent to a DC contactor, which controls the charging status of the electric vehicle. The charging status is either "end charging" or "continue charging". The DC contactor is located between the charging gun and the DC charger. The step of sending the voltage output result to a DC contactor and controlling the charging state of the electric vehicle through the DC contactor includes: using the voltage output result as the power input signal of the DC contactor to control the connection state of the DC contactor; when the voltage output result is a first voltage signal, the power input signal of the DC contactor exists, and the DC contactor is controlled to be in a conducting state; when the voltage output result is a second voltage signal, the power input signal of the DC contactor disappears, and the DC contactor is controlled to be in a turning-off state, wherein the voltage amplitude of the first voltage signal is greater than the voltage amplitude of the second voltage signal; The method further includes: the voltage comparison circuit includes a voltage comparator, a first transistor, and a second transistor; the reference voltage signal is input to the positive input terminal of the voltage comparator, and the connection voltage signal is input to the negative input terminal of the voltage comparator; when the charging gun and the gun holder are connected normally, the connection voltage signal is less than the reference voltage, the voltage comparator outputs a high-level signal, the first transistor and the second transistor are turned on, and the DC contactor is controlled to close; when the charging gun and the gun holder are connected abnormally, the connection voltage signal is greater than the reference voltage, the voltage comparator outputs a low-level signal, the first transistor and the second transistor are not turned on, and the DC contactor is controlled to open.

2. An electric vehicle charging control system, characterized in that, The method for implementing the electric vehicle charging control method of claim 1 includes: a main control device and a power supply circuit, wherein the power supply circuit includes: a voltage comparison circuit and a DC contactor, wherein... The main control device is used to collect the connection voltage signal between the charging gun holder and the charging gun on the electric vehicle, and send the connection voltage signal to the voltage comparison circuit; The voltage comparison circuit is connected to the main control device and is used to compare the connection voltage signal with the reference voltage signal to obtain the voltage output result of the voltage comparison circuit. The DC contactor, connected to the voltage comparison circuit, the charging gun, and the DC charger, is positioned between the charging gun and the DC charger to control the charging status of the electric vehicle, wherein the charging status is: end charging or continue charging.

3. The system according to claim 2, characterized in that, The voltage comparison circuit includes: a voltage comparator, a first transistor, a second transistor, a first resistor, and a second resistor, wherein... The positive input terminal of the voltage comparator is used to connect to the reference voltage signal, and the negative input terminal of the voltage comparator is used to connect to the connection voltage signal. The output terminal of the voltage comparator is connected to one end of the first resistor, the other end of the first resistor is connected to the base of the first transistor, the emitter of the first transistor is connected to the ground terminal, the collector of the first transistor is connected to one end of the second resistor, the other end of the second resistor is connected to the base of the second transistor, the emitter of the second transistor is connected to a preset third voltage signal, and the collector of the second transistor is connected to the ground terminal.

4. The system according to claim 3, characterized in that, The voltage comparison circuit further includes a third resistor, through which the collector of the second transistor is connected to the ground terminal.

5. An electric vehicle charging control device, characterized in that, include: The acquisition module is used to acquire the connection voltage signal between the charging gun holder and the charging gun on the electric vehicle; The comparison module is used to compare the connected voltage signal with the reference voltage signal through a voltage comparison circuit to obtain the voltage output result of the voltage comparison circuit; The control module is used to send the voltage output result to the DC contactor and control the charging state of the electric vehicle through the DC contactor. The charging state is: end charging or continue charging. The DC contactor is located between the charging gun and the DC charger. The control module is further configured to use the voltage output result as the power input signal for the DC contactor to control the connection state of the DC contactor; when the voltage output result is a first voltage signal, the power input signal for the DC contactor exists, and the DC contactor is controlled to be in the on state; when the voltage output result is a second voltage signal, the power input signal for the DC contactor disappears, and the DC contactor is controlled to be in the off state, wherein the voltage amplitude of the first voltage signal is greater than the voltage amplitude of the second voltage signal; The device further includes a voltage comparator, a first transistor, and a second transistor in the voltage comparison circuit. The reference voltage signal is input to the positive input terminal of the voltage comparator, and the connection voltage signal is input to the negative input terminal of the voltage comparator. When the charging gun and its socket are properly connected, the connection voltage signal is less than the reference voltage, the voltage comparator outputs a high-level signal, and the first and second transistors conduct, at which point the DC contactor is closed. When the charging gun and its socket are improperly connected, the connection voltage signal is greater than the reference voltage, the voltage comparator outputs a low-level signal, and the first and second transistors cannot conduct, at which point the DC contactor is opened.

6. A non-volatile storage medium, characterized in that, The non-volatile storage medium stores multiple instructions, which are adapted to be loaded by a processor and executed by the electric vehicle charging control method of claim 1.

7. An electronic device, characterized in that, It includes one or more processors and a memory, the memory being used to store one or more programs, wherein when the one or more programs are executed by the one or more processors, the one or more processors cause the one or more processors to implement the electric vehicle charging control method of claim 1.

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