Charging detection circuit and charging socket

Abstract

The embodiment of the present application provides a charging detection circuit and a charging socket. The charging detection circuit comprises a charging plug-in gun wake-up circuit, a charging plug-out gun wake-up circuit, a switch and a first resistor. The charging plug-in gun wake-up circuit and the charging plug-out gun wake-up circuit are connected with a first end of the first resistor respectively, and a second end of the first resistor is connected with the switch. In a conductive path in which the charging plug-in gun wake-up circuit and the charging plug-out gun wake-up circuit are connected with the first end of the first resistor respectively, a voltage detection point is arranged, and the voltage detection point is a position at which a resistor in a charging gun is connected into the conductive path. The charging plug-in gun wake-up circuit is used for being turned on when the switch is in a closed state and a voltage of the voltage detection point suddenly drops, so as to enter a charging process. The charging plug-out gun wake-up circuit is used for being turned on when the switch is in the closed state and the voltage of the voltage detection point suddenly rises, so as to exit the charging process. The present application achieves the effect of simplifying the circuit structure of a charging system.

Description

Technical Field

[0001] This application relates to the field of circuit technology, and in particular to a charging detection circuit and a charging socket. Background Technology

[0002] In electric vehicle charging systems, the charging detection circuit is the core hub. The vehicle controller uses its signals to determine the charging gun connection status and quickly switch between active and dormant states. "Plug-in wake-up" triggers the vehicle controller to quickly start the charging process, while "unplug-in wake-up" triggers the vehicle controller to perform safety operations such as insulation checks.

[0003] In related technologies, plug-in wake-up and plug-out wake-up typically rely on two independent circuits. One circuit handles the plug-in wake-up task, responding to the charging gun connection event to trigger the controller to start and enter the charging process. The other circuit handles the plug-out wake-up function, outputting a control signal to exit the charging process when the charging gun is removed.

[0004] However, the above method requires separate detection circuits for each of the two circuits, resulting in an overly complex charging system circuit structure. Utility Model Content

[0005] This application provides a charging detection circuit and a charging socket to achieve the technical effect of reducing the complexity of the charging system circuit structure.

[0006] In a first aspect, embodiments of this application provide a charging detection circuit, including: a charging plug wake-up circuit, a charging plug-out wake-up circuit, a switch, and a first resistor;

[0007] The charging gun insertion wake-up circuit and the charging gun removal wake-up circuit are respectively connected to the first end of the first resistor, and the second end of the first resistor is connected to the switch.

[0008] In the conductive path where the charging gun activation circuit and the charging gun deactivation circuit are respectively connected to the first end of the first resistor, a voltage detection point is provided. The voltage detection point is the position where the resistor in the charging gun is connected to the conductive path.

[0009] The charging gun wake-up circuit is used to turn on when the switch is in the closed state and the voltage at the voltage detection point suddenly drops, so as to start the charging process.

[0010] The charging gun unplug wake-up circuit is used to activate when the switch is in the closed state and the voltage at the voltage detection point suddenly increases, so as to exit the charging process.

[0011] In one possible implementation, the charging plug wake-up circuit includes: a first power supply, a first metal-oxide-semiconductor field-effect transistor, a second resistor, a third resistor, a first diode, and a first capacitor;

[0012] The first power supply is connected to the first terminal of the second resistor and the source terminal of the first metal-oxide-semiconductor field-effect transistor, respectively, and the first diode is connected in parallel with the second resistor.

[0013] The gate terminal of the first metal-oxide-semiconductor field-effect transistor is connected to the first terminal of the third resistor, and the second terminal of the second resistor is connected between the gate terminal of the first metal-oxide-semiconductor field-effect transistor and the first terminal of the third resistor.

[0014] The second end of the third resistor is connected to the first end of the first capacitor, and the second end of the first capacitor is connected to the first end of the first resistor.

[0015] In one possible implementation, a second diode is also included;

[0016] The first terminal of the second diode is connected to the drain terminal of the first metal-oxide-semiconductor field-effect transistor;

[0017] The second terminal of the second diode is connected to the output circuit, which is used to output a charging enable signal.

[0018] In one possible implementation, the charging gun unplug wake-up circuit includes: a second power supply, a second metal-oxide-semiconductor field-effect transistor, a fourth resistor, a fifth resistor, a third diode, and a voltage regulation circuit.

[0019] The second power supply is connected to the first terminal of the fourth resistor and the source terminal of the second metal-oxide-semiconductor field-effect transistor, respectively, and the third diode is connected in parallel with the fourth resistor.

[0020] The gate terminal of the second metal-oxide-semiconductor field-effect transistor is connected to the first terminal of the fifth resistor, and the second terminal of the fourth resistor is connected between the gate terminal of the second metal-oxide-semiconductor field-effect transistor and the first terminal of the fifth resistor.

[0021] The second end of the fifth resistor is connected to the first end of the voltage regulation circuit, and the second end of the voltage regulation circuit is connected to the first end of the first resistor.

[0022] In one possible implementation, the voltage regulation circuit includes: a third metal-oxide-semiconductor field-effect transistor, a fourth diode, a sixth resistor, a seventh resistor, a fifth diode, and a second capacitor.

[0023] The drain terminal of the third metal-oxide-semiconductor field-effect transistor is connected to the second terminal of the fifth resistor;

[0024] The gate terminal of the third metal-oxide-semiconductor field-effect transistor is connected to the first terminal of the sixth resistor and the first terminal of the seventh resistor, respectively. The second terminal of the seventh resistor is connected to the first terminal of the second capacitor, and the second terminal of the second capacitor is connected to the first terminal of the first resistor.

[0025] The fourth diode is connected in parallel with the sixth resistor, and the fifth diode is connected in parallel between the gate and source terminals of the third metal-oxide-semiconductor field-effect transistor.

[0026] The source terminal of the third metal-oxide-semiconductor field-effect transistor and the second terminal of the sixth resistor are grounded respectively.

[0027] In one possible implementation, it further includes: a sixth diode;

[0028] The first terminal of the sixth diode is connected to the drain terminal of the second metal-oxide-semiconductor field-effect transistor;

[0029] The second terminal of the sixth diode is connected to the output circuit, which is also used to output a power-off enable signal.

[0030] In one possible implementation, the switch includes: a third power supply, a fourth metal-oxide-semiconductor field-effect transistor, a seventh diode, an eighth resistor, a ninth resistor, a fifth metal-oxide-semiconductor field-effect transistor, an eighth diode, a tenth resistor, a ninth diode, and a turn-off circuit.

[0031] The third power supply is connected to the source terminal of the fourth metal-oxide-semiconductor field-effect transistor and the first terminal of the eighth resistor, respectively. The gate terminal of the fourth metal-oxide-semiconductor field-effect transistor and the second terminal of the eighth resistor are connected to the first terminal of the ninth resistor, respectively. The seventh diode is connected in parallel with the eighth resistor.

[0032] The drain terminal of the fourth metal-oxide-semiconductor field-effect transistor is connected to the second terminal of the first resistor;

[0033] The second terminal of the ninth resistor is connected to the drain terminal of the fifth metal-oxide-semiconductor field-effect transistor, and the gate terminal of the fifth metal-oxide-semiconductor field-effect transistor is connected to the first terminal of the tenth resistor and the turn-off circuit, respectively.

[0034] The eighth diode is connected in parallel with the tenth resistor, and the ninth diode is connected in parallel between the gate and source terminals of the fifth metal-oxide-semiconductor field-effect transistor.

[0035] The source terminal of the fifth metal-oxide-semiconductor field-effect transistor and the second terminal of the tenth resistor are grounded respectively;

[0036] The shutdown circuit is used to turn on the fourth metal-oxide-semiconductor field-effect transistor and the fifth metal-oxide-semiconductor field-effect transistor to make the switch closed; or, it is used to turn off the fourth metal-oxide-semiconductor field-effect transistor and the fifth metal-oxide-semiconductor field-effect transistor to make the switch open.

[0037] In one possible implementation, the shutdown circuit includes: a fourth power supply, an eleventh resistor, a transistor, a twelfth resistor, a thirteenth resistor, and a microcontroller unit.

[0038] The fourth power supply is connected to the first end of the eleventh resistor, and the second end of the eleventh resistor is connected to the gate end of the fifth metal-oxide-semiconductor field-effect transistor and the collector end of the transistor, respectively.

[0039] The base terminal of the transistor is connected to the first terminal of the twelfth resistor and the first terminal of the thirteenth resistor, respectively, and the second terminal of the thirteenth resistor is connected to the microcontroller unit.

[0040] The emitter terminal of the transistor and the second terminal of the twelfth resistor are grounded respectively.

[0041] In one possible implementation, a voltage detection circuit is also included;

[0042] The voltage detection circuit is connected to the first end of the first resistor and is used to detect the voltage at the voltage detection point.

[0043] Secondly, embodiments of this application provide a charging socket, including a charging detection circuit as described in any of the first aspects.

[0044] This application provides a charging detection circuit and a charging socket. The charging detection circuit includes a charging gun activation circuit, a charging gun removal activation circuit, a switch, and a first resistor. The charging gun activation circuit and the charging gun removal activation circuit are respectively connected to the first end of the first resistor, and the second end of the first resistor is connected to the switch. A voltage detection point is provided in the conductive path where the charging gun activation circuit and the charging gun removal activation circuit are respectively connected to the first end of the first resistor. The voltage detection point is the position where the resistor in the charging gun is connected to the conductive path. The charging gun activation circuit is used to conduct when the switch is closed and the voltage at the voltage detection point suddenly drops, to initiate the charging process. The charging gun removal activation circuit is used to conduct when the switch is closed and the voltage at the voltage detection point suddenly rises, to exit the charging process. This application eliminates the need for separate detection circuits for charging and removal activation by sharing the first resistor, the switch, and the voltage detection point in the same conductive path between the charging gun activation circuit and the charging gun removal activation circuit. Based on the principle that a sudden drop in voltage at the voltage detection point triggers the charging gun wake-up circuit to start the charging process when the charging gun is connected, and a sudden rise in voltage at the voltage detection point triggers the charging gun removal wake-up circuit to exit the charging process when the charging gun is disconnected, the circuit structure of the charging system is simplified, and the problem of complex circuit structure caused by relying on two independent circuits in related technologies is solved. Attached Figure Description

[0045] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0046] Figure 1 This application provides an illustration of an application scenario.

[0047] Figure 2 This is a schematic diagram of a charging detection circuit provided in an embodiment of this application;

[0048] Figure 3 This is a schematic diagram of the structure of a charging plug wake-up circuit provided in an embodiment of this application;

[0049] Figure 4 A schematic diagram of a charging gun unplugging wake-up circuit provided in an embodiment of this application;

[0050] Figure 5 This is a schematic diagram of the structure of a switch provided in an embodiment of this application;

[0051] Figure 6 This is a schematic diagram of a voltage detection circuit provided in an embodiment of this application;

[0052] Figure 7 This is a schematic diagram of another charging detection circuit provided in an embodiment of this application.

[0053] Explanation of reference numerals in the attached figures:

[0054] 01-Charging gun; 02-Charging socket; 21-Charging gun activation circuit; 22-Charging gun activation circuit; 23-Switch; 24-First resistor; 001-Resistor in the charging gun; 211-First power supply; 212-First metal-oxide-semiconductor field-effect transistor; 213-Second resistor; 214-Third resistor; 215-First diode; 216-First capacitor; 25-Second diode; 26-Output circuit; 221-Second power supply; 222-Second metal-oxide-semiconductor field-effect transistor; 223-Fourth resistor; 224-Fifth resistor; 225-Third diode; 226-Voltage regulation circuit; 2261-Third metal-oxide-semiconductor field-effect transistor; 2262-Fourth diode; 2263-Sixth resistor; 2264-Seventh resistor 2265 - Fifth diode; 2266 - Second capacitor; 27 - Sixth diode; 231 - Third power supply; 232 - Fourth metal-oxide-semiconductor field-effect transistor; 233 - Seventh diode; 234 - Eighth resistor; 235 - Ninth resistor; 236 - Fifth metal-oxide-semiconductor field-effect transistor; 237 - Eighth diode; 238 - Tenth resistor; 239 - Ninth diode; 241 - Shutdown circuit; 2411 - Fourth power supply; 2412 - Eleventh resistor; 2413 - Transistor; 2414 - Twelfth resistor; 2415 - Thirteenth resistor; 2416 - Microcontroller unit; 28 - Voltage detection circuit; 281 - Fourteenth resistor; 282 - Fifteenth resistor; 283 - Sixteenth resistor; 284 - Third capacitor; 285 - Analog-to-digital converter; 29 - Fourth capacitor; 30 - Tenth diode.

[0055] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0056] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0057] In the conductive charging system of electric vehicles, the charging detection circuit is the core hub connecting the charging equipment and the vehicle controller. Its performance directly determines the safety, efficiency, and energy optimization level of the charging process.

[0058] The vehicle controller relies on signals from the charging detection circuit to accurately determine the insertion / removal status of the charging gun (also known as the charging plug), and then quickly switches to either a working or sleep state. Specifically, when the charging gun is plugged into the charging socket, it quickly wakes up to initiate the charging preparation process; when the charging gun is disconnected from the charging socket, it responds promptly to complete power-off protection and enter sleep mode, thereby avoiding unnecessary energy consumption by the controller and ensuring the stable operation of the charging chain.

[0059] In related technologies, to achieve the two core functions of charging gun insertion wake-up and charging gun removal wake-up, two independent circuit designs are usually adopted. One dedicated charging gun insertion wake-up circuit is responsible for detecting the charging gun insertion signal and waking up the controller to enter the charging process, while the other dedicated charging gun removal wake-up circuit is responsible for detecting the charging gun removal signal to exit the charging process.

[0060] While this discrete design pattern can meet basic functional requirements to a certain extent, it has significant drawbacks. The two circuits need to be configured with corresponding detection circuits, resulting in a complex and redundant circuit structure.

[0061] With the continuous development of electric vehicle charging technology, relevant industry standards are also being continuously upgraded. The standard "GBT18487.5-2024 Electric Vehicle Conductive Charging System Part 5: DC Charging System for GBT 20234.3" clearly requires that the charging system must simultaneously support the functions of plugging in the charging gun to wake up and unplugging the charging gun to wake up, so as to shorten the charging preparation time and enhance the safety monitoring capability after charging is completed.

[0062] Under the new national standard, the complex circuitry of existing technologies can no longer meet the industry's demands for high integration, cost-effectiveness, and adaptability in charging detection circuits. Therefore, developing a charging detection circuit that can balance the requirements of the new national standard with the need for circuit simplification has become a pressing issue in the field of electric vehicle charging technology.

[0063] To address the aforementioned issues in related technologies, during the research process, the charging gun activation circuit and the charging gun removal activation circuit were connected to the same end of a first resistor. A switch was then used at the other end of the first resistor to establish voltage detection points corresponding to the charging gun resistor connection positions within the conductive paths connecting the two activation circuits to the first resistor. When the switch is closed, a voltage drop at the detection point caused by the charging gun connection triggers the charging gun activation circuit to initiate the charging process; conversely, a voltage rise caused by the charging gun removal triggers the charging gun removal activation circuit to exit the charging process. By sharing the first resistor, voltage detection points, and the switch, the activation functions of both the charging gun activation and removal activation circuits are integrated, thus simplifying the circuit structure of the charging system.

[0064] To facilitate understanding of this application, an exemplary application scenario is provided below. Please refer to [link / reference]. Figure 1 , Figure 1 This application provides an application scenario diagram, which includes a charging gun 01 and a charging socket 02. The charging socket is installed on an electric vehicle and has a charging detection circuit inside.

[0065] When the charging gun 01 and the charging socket 02 are in operation, if the charging detection circuit detects a sudden drop in voltage at the voltage detection point, the controller will perform charging control; if the charging detection circuit detects a sudden rise in voltage at the voltage detection point, the controller will perform power-off control.

[0066] It is understood that the above scenario examples are for illustrative purposes only and do not impose any limitations on this application.

[0067] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0068] Please see Figure 2 , Figure 2 The schematic diagram of a charging detection circuit provided in this application embodiment includes a charging plug wake-up circuit 21, a charging plug-out wake-up circuit 22, a switch 23, and a first resistor 24.

[0069] The connection relationship is as follows: the charging plug-in wake-up circuit 21 and the charging plug-out wake-up circuit 22 are respectively connected to the first end of the first resistor 24, and the second end of the first resistor 24 is connected to the switch 23.

[0070] In the conductive path where the charging gun activation circuit 21 and the charging gun deactivation circuit 22 are respectively connected to the first end of the first resistor 24, a voltage detection point A is provided. This voltage detection point is the position where the resistor 001 in the charging gun is connected to the conductive path.

[0071] In this embodiment, a charging socket is also provided, which includes the charging detection circuit described above, and a controller connected to the charging detection circuit. When the controller is in a sleep state, switch 23 is in a normally closed state, and the controller is used to detect whether a charging or power-off wake-up signal is received. When the controller is in an operating state, switch 23 is in a normally open state, and the controller enters a charging control process or a power-off control process.

[0072] The charging gun wake-up circuit 21 is used to conduct when the switch 23 is in the closed state and the voltage at the voltage detection point suddenly drops, so as to carry out charging.

[0073] In this embodiment, the charging plug wake-up circuit 21 triggers a wake-up signal when a falling edge is detected at the voltage detection point.

[0074] The charging gun unplug wake-up circuit 22 is used to turn on when the switch 23 is in the closed state and the voltage at the voltage detection point suddenly rises, so as to cut off the power.

[0075] In this embodiment, the charging gun unplug wake-up circuit 22 triggers a wake-up signal when a falling edge is detected at the voltage detection point.

[0076] In the above embodiments of this application, the charging detection circuit includes a charging plug wake-up circuit 21, a charging plug wake-up circuit 22, a switch 23, and a first resistor 24. The charging plug wake-up circuit 21 and the charging plug wake-up circuit 22 are respectively connected to the first end of the first resistor 24, and the second end of the first resistor 24 is connected to the switch 23. A voltage detection point is provided in the conductive path where the charging plug wake-up circuit 21 and the charging plug wake-up circuit 22 are respectively connected to the first end of the first resistor 24. The voltage detection point is the position where the resistor in the charging gun is connected to the conductive path. The charging plug wake-up circuit 21 is used to conduct when the switch 23 is in the closed state and the voltage at the voltage detection point suddenly drops, so as to wake up the vehicle controller and quickly enter the charging process. The charging plug wake-up circuit 22 is used to conduct when the switch 23 is in the closed state and the voltage at the voltage detection point suddenly rises, so as to wake up the vehicle controller and exit the charging process. This application simplifies the charging system's circuit structure by sharing the first resistor 24, switch 23, and voltage detection point in the same conductive path between the charging gun insertion wake-up circuit 21 and the charging gun removal wake-up circuit 22. This eliminates the need for separate detection circuits for charging and removal wake-up. It achieves the functionality of triggering the charging gun insertion wake-up circuit 21 to conduct when the charging gun is connected, and triggering the charging gun removal wake-up circuit 22 to conduct when the charging gun is removed. This solves the problem of complex circuit structures caused by relying on two independent circuits in related technologies.

[0077] Furthermore, based on the above embodiments, the structure of the charging gun wake-up circuit 21 will be described below through the embodiments. Please refer to [link to relevant documentation]. Figure 3 , Figure 3 A schematic diagram of a charging plug wake-up circuit provided in this application embodiment includes: a first power supply 211, a first metal-oxide-semiconductor field-effect transistor 212, a second resistor 213, a third resistor 214, a first diode 215, and a first capacitor 216.

[0078] The connection relationship is as follows: the first power supply 211 is connected to the first end of the second resistor 213 and the source end of the first metal-oxide-semiconductor field-effect transistor 212 respectively, and the first diode 215 is connected in parallel with the second resistor 213.

[0079] The gate terminal of the first metal-oxide-semiconductor field-effect transistor 212 is connected to the first terminal of the third resistor 214, and the second terminal of the second resistor 213 is connected between the gate terminal of the first metal-oxide-semiconductor field-effect transistor 212 and the first terminal of the third resistor 214.

[0080] The second end of the third resistor 214 is connected to the first end of the first capacitor 216, and the second end of the first capacitor 216 is connected to the first end of the first resistor 24.

[0081] Optionally, the first power supply 211 can be the vehicle's constant power supply KL30, the first metal-oxide-semiconductor field-effect transistor 212 can be a P-type metal-oxide-semiconductor (PMOS), and the first diode 215 can be a Zener diode.

[0082] In this embodiment, the charging detection circuit may further include a second diode 25 and an output circuit 26.

[0083] The first end of the second diode 25 is connected to the drain terminal of the first metal-oxide-semiconductor field-effect transistor 212, and the second end of the second diode 25 is connected to the output circuit 26, which is used to output a charging enable signal.

[0084] In the above embodiments of this application, the charging plug wake-up circuit 21 achieves fast response and stable power supply by utilizing the synergistic effect of the first power supply 211, the first metal-oxide-semiconductor field-effect transistor 212, the second resistor 213, the third resistor 214, the first diode 215, and the first capacitor 216, and by using the parallel design of the diode and the resistor. The gate control of the first metal-oxide-semiconductor field-effect transistor 212, combined with the charging and discharging characteristics of the resistor and the capacitor, can effectively realize the precise wake-up function during the charging process, ensure the reliable operation of the circuit when switching charging states, and at the same time simplify the circuit structure and improve the overall stability and response speed.

[0085] Furthermore, based on the above embodiments, the structure of the charging gun unplug wake-up circuit 22 will be described below through the embodiments. Please refer to [link to relevant documentation]. Figure 4 , Figure 4 A schematic diagram of a charging gun removal wake-up circuit provided in an embodiment of this application includes a second power supply 221, a second metal-oxide-semiconductor field-effect transistor 222, a fourth resistor 223, a fifth resistor 224, a third diode 225, and a voltage regulation circuit 226.

[0086] The connection relationship is as follows:

[0087] The second power supply 221 is connected to the first terminal of the fourth resistor 223 and the source terminal of the second metal-oxide-semiconductor field-effect transistor 222, respectively, and the third diode 225 is connected in parallel with the fourth resistor 223.

[0088] The gate terminal of the second metal-oxide-semiconductor field-effect transistor 222 is connected to the first terminal of the fifth resistor 224, and the second terminal of the fourth resistor 223 is connected between the gate terminal of the second metal-oxide-semiconductor field-effect transistor 222 and the first terminal of the fifth resistor 224.

[0089] The second end of the fifth resistor 224 is connected to the first end of the voltage regulation circuit 226, and the second end of the voltage regulation circuit 226 is connected to the first end of the first resistor 24.

[0090] Optionally, the second power supply 221 can be the vehicle's constant power supply KL30, the second metal-oxide-semiconductor field-effect transistor 222 can be a P-type metal-oxide-semiconductor field-effect transistor, and the third diode 225 can be a Zener diode.

[0091] The voltage regulation circuit may include a third metal-oxide-semiconductor field-effect transistor 2261, a fourth diode 2262, a sixth resistor 2263, a seventh resistor 2264, a fifth diode 2265, and a second capacitor 2266.

[0092] The connection is as follows: the drain terminal of the third metal-oxide-semiconductor field-effect transistor 2261 is connected to the second terminal of the fifth resistor 224.

[0093] The gate terminal of the third metal-oxide-semiconductor field-effect transistor 2261 is connected to the first terminal of the sixth resistor 2263 and the first terminal of the seventh resistor 2264, respectively. The second terminal of the seventh resistor 2264 is connected to the first terminal of the second capacitor 2266, and the second terminal of the second capacitor 2266 is connected to the first terminal of the first resistor 24.

[0094] The fourth diode 2262 is connected in parallel with the sixth resistor 2263, and the fifth diode 2265 is connected in parallel between the gate and source terminals of the third metal-oxide-semiconductor field-effect transistor 2261.

[0095] The source terminal of the third metal-oxide-semiconductor field-effect transistor 2261 and the second terminal of the sixth resistor 2263 are grounded respectively.

[0096] Optionally, the third metal-oxide-semiconductor field-effect transistor 2261 can be an N-type metal-oxide-semiconductor (NMOS) field-effect transistor, the fourth diode 2262 can be a Zener diode, and the fifth diode 2265 can be a bidirectional trigger diode.

[0097] In this embodiment, the charging detection circuit may further include a sixth diode 27. The first end of the sixth diode 27 is connected to the drain end of the second metal-oxide-semiconductor field-effect transistor 222, and the second end of the sixth diode 27 is connected to the output circuit 26. The output circuit 26 is also used to output a power-off enable signal.

[0098] In the above embodiments of this application, the charging gun unplug wake-up circuit 22, through the cooperation of a second power supply 221, a second metal-oxide-semiconductor field-effect transistor 222, a fourth resistor 223, a fifth resistor 224, a third diode 225, and a voltage regulation circuit 226, utilizes the parallel connection of the diode and resistor to achieve voltage freewheeling at the moment of power failure. The gate control of the field-effect transistor is combined with the resistor voltage divider and the voltage regulation circuit 226. This allows for precise triggering of the wake-up signal in the power-off state, ensuring a reliable wake-up response of the system during power failure.

[0099] Furthermore, based on any of the above embodiments, the structure of switch 23 will be described below through the embodiments. Please refer to... Figure 5 , Figure 5 The present application provides a schematic diagram of a switch structure, which includes a third power supply 231, a fourth metal-oxide-semiconductor field-effect transistor 232, a seventh diode 233, an eighth resistor 234, a ninth resistor 235, a fifth metal-oxide-semiconductor field-effect transistor 236, an eighth diode 237, a tenth resistor 238, a ninth diode 239, and a turn-off circuit 241.

[0100] The connection relationship is as follows:

[0101] The third power supply 231 is connected to the source terminal of the fourth metal-oxide-semiconductor field-effect transistor 232 and the first terminal of the eighth resistor 234, respectively. The gate terminal of the fourth metal-oxide-semiconductor field-effect transistor 232 and the second terminal of the eighth resistor 234 are connected to the first terminal of the ninth resistor 235, respectively. The seventh diode 233 is connected in parallel with the eighth resistor 234.

[0102] The drain terminal of the fourth metal-oxide-semiconductor field-effect transistor 232 is connected to the second terminal of the first resistor 24.

[0103] The second terminal of the ninth resistor 235 is connected to the drain terminal of the fifth metal-oxide-semiconductor field-effect transistor 236, and the gate terminal of the fifth metal-oxide-semiconductor field-effect transistor 236 is connected to the first terminal of the tenth resistor 238 and the turn-off circuit 241, respectively.

[0104] The eighth diode 237 is connected in parallel with the tenth resistor 238, and the ninth diode 239 is connected in parallel between the gate and source terminals of the fifth metal-oxide-semiconductor field-effect transistor 236.

[0105] The source terminal of the fifth metal-oxide-semiconductor field-effect transistor 236 and the second terminal of the tenth resistor 238 are grounded respectively.

[0106] The shutdown circuit 241 is used to turn on the fourth metal-oxide-semiconductor field-effect transistor 232 and the fifth metal-oxide-semiconductor field-effect transistor 236, so that the switch 23 is in the closed state. Alternatively, it is used to turn off the fourth metal-oxide-semiconductor field-effect transistor 232 and the fifth metal-oxide-semiconductor field-effect transistor 236, so that the switch 23 is in the open state.

[0107] Optionally, the third power supply 231 can be the vehicle's constant power supply KL30, the fourth metal-oxide-semiconductor field-effect transistor 232 can be a P-type metal-oxide-semiconductor field-effect transistor, the fifth metal-oxide-semiconductor field-effect transistor 236 can be an N-type metal-oxide-semiconductor field-effect transistor, the seventh diode 233 and the eighth diode 237 can be Zener diodes, and the ninth diode 239 can be a bidirectional trigger diode.

[0108] The shutdown circuit includes: a fourth power supply 2411, an eleventh resistor 2412, a transistor 2413, a twelfth resistor 2414, a thirteenth resistor 2415, and a microcontroller unit 2416.

[0109] The connection relationship is as follows:

[0110] The fourth power supply 2411 is connected to the first end of the eleventh resistor 2412, and the second end of the eleventh resistor 2412 is connected to the gate end of the fifth metal-oxide-semiconductor field-effect transistor 236 and the collector end of the transistor 2413, respectively.

[0111] The base terminal of transistor 2413 is connected to the first terminal of twelfth resistor 2414 and the first terminal of thirteenth resistor 2415, respectively. The second terminal of thirteenth resistor 2415 is connected to microcontroller unit 23.

[0112] The emitter terminal of transistor 2413 and the second terminal of the twelfth resistor 2414 are grounded respectively.

[0113] Optionally, the fourth power supply 2411 can be the vehicle's constant power supply KL30, and the transistor 2413 can be an N-type transistor.

[0114] In the above embodiments of this application, a switch 23 structure is provided, consisting of a third power supply 231, a fourth metal-oxide-semiconductor field-effect transistor 232 and a fifth metal-oxide-semiconductor field-effect transistor 236, a seventh diode 233 to a ninth diode 239, an eighth resistor 234 to a tenth resistor 238, and a turn-off circuit 241. By utilizing the connection relationships of each component, the turn-off circuit 241 controls the conduction and turn-off of the fourth metal-oxide-semiconductor field-effect transistor 232 and the fifth metal-oxide-semiconductor field-effect transistor 236, thereby achieving the switching between the closed and open states of the switch 23.

[0115] This application also provides a voltage detection circuit 28, please refer to [link to relevant documentation]. Figure 6 , Figure 6 This is a schematic diagram of a voltage detection circuit 28 provided in an embodiment of this application. The voltage detection circuit 28 is connected to the first end of the first resistor 24 and is used to detect the voltage at the voltage detection point.

[0116] The voltage detection circuit 28 specifically includes: a fourteenth resistor 281, a fifteenth resistor 282, a sixteenth resistor 283, a third capacitor 284, and an analog-to-digital converter 285.

[0117] The connection relationship is as follows:

[0118] The first end of the fourteenth resistor 281 is connected to the first end of the first resistor 24. The second end of the fourteenth resistor 281 is connected to the first end of the fifteenth resistor 282 and the first end of the sixteenth resistor 283 respectively. The second end of the sixteenth resistor 283 is grounded. The second end of the fifteenth resistor 282 is connected to the first end of the analog-to-digital converter 285 and the third capacitor 284 respectively. The second end of the third capacitor 284 is grounded.

[0119] In the above embodiments of this application, a voltage divider network is formed by the fourteenth resistor 281, the fifteenth resistor 282, and the sixteenth resistor 283. Combined with the third capacitor 284 for filtering and the analog-to-digital converter 285, accurate detection of the voltage at the voltage detection point is achieved. The voltage divider circuit can proportionally reduce the high-voltage signal to the range of the analog-to-digital converter 285, and the third capacitor 284 can filter out high-frequency interference, improving detection stability. The overall structure is simple and low-cost, and can effectively obtain real-time voltage information from the voltage detection point.

[0120] According to any of the above embodiments, the complete charging detection circuit can be as follows: Figure 7 As shown, Figure 7 This is a schematic diagram of another charging detection circuit provided in an embodiment of this application.

[0121] exist Figure 7It includes a charging plug-in wake-up circuit 21, a charging plug-out wake-up circuit 22, a switch 23, a first resistor 24, and a voltage detection circuit 28.

[0122] A fourth capacitor 29 and a tenth diode 30 are also provided in the connection path between the first resistor 24 and the charging plug wake-up circuit 21 and the charging plug wake-up circuit 22, respectively. The first segment of the fourth capacitor 29 and the first end of the tenth diode 30 are connected to the above connection path, and the second end of the fourth capacitor 29 and the second end of the tenth diode 30 are grounded. Among them, the ninth diode 239 can be a bidirectional trigger diode.

[0123] For the specific connection relationships of each component in each circuit, please refer to any of the above embodiments. To avoid redundancy, the description will not be repeated.

[0124] This application also provides a charging socket, which includes a charging detection circuit and a controller according to any of the above embodiments. The specific role of the controller in the charging detection circuit will be described in detail in the following embodiments; please refer to the following embodiments.

[0125] To facilitate a better understanding of the charging detection circuit of this application, the charging and power-off processes of the circuit are described below.

[0126] Wake up when the charging gun is plugged in:

[0127] Before the charging gun is plugged into the vehicle's charging socket, the voltage at voltage detection point A is U_CC2 = (fourteenth resistor 281 + sixteenth resistor 283) / (first resistor 24 + fourteenth resistor 281 + sixteenth resistor 283) × U_KL30, where U_KL30 is the constant voltage of the vehicle's electrical system KL30. Here, the fourteenth resistor 281 and the sixteenth resistor 283 form a voltage divider circuit for voltage detection point A. Their resistance values ​​are set to be much larger than the resistance value of the first resistor 24, thereby reducing the influence of the voltage divider circuit on voltage detection point A. Therefore, U_CC2 ≈ U_KL30.

[0128] After the charging gun is plugged into the vehicle's charging socket, the charging gun's resistor 001 is connected to the charging socket's charging detection circuit. At this time, the voltage at voltage detection point A is U_CC2 = first resistor 24 / (charging gun resistor 001 + first resistor 24) × U_KL30 = (1 / 3) × U_KL30. Assume that the charging gun's resistor 001 is twice the resistance of the first resistor. The charging gun wake-up circuit 21 utilizes the principle that the voltage of a capacitor cannot change abruptly. When the voltage at voltage detection point A suddenly drops, the voltage U1 on the other side of the first capacitor 216 will also drop along with the voltage at voltage detection point A. At this time, the voltage across the second resistor 213 is: U_second resistor 213 = U_gate GS of the first metal-oxide-semiconductor field-effect transistor 212 = second resistor 213 / (second resistor 213 + third resistor 214) × (U_KL30 - U_CC2). At this time, the voltage across the second resistor 213 is greater than the turn-on voltage of the first metal-oxide-semiconductor field-effect transistor 212, the first metal-oxide-semiconductor field-effect transistor 212 turns on, and the output circuit 26 outputs a wake-up enable signal to trigger the controller to enter the working state.

[0129] After the controller detects the wake-up enable signal output, it can detect the voltage at voltage detection point A through voltage detection circuit 28. When it is determined from the voltage at voltage detection point A that the charging gun is indeed inserted into the charging socket, the controller enters the charging process, shortening the charging preparation time. The turn-on time of the first metal-oxide-semiconductor field-effect transistor 212 is equivalent to the duration of the wake-up enable signal, which depends on the charging time of the first capacitor 216. When the voltage U1 on the other side of the first capacitor 216 gradually rises to U_KL30, that is, when the voltage across the second resistor 213: U_second resistor 213 = U_gate GS of the first metal-oxide-semiconductor field-effect transistor 212 = second resistor 213 / (second resistor 213 + third resistor 214) × (U_KL30 - U_CC2), is less than the turn-on voltage of the first metal-oxide-semiconductor field-effect transistor 212, the wake-up enable signal is turned off. At this time, the controller can enter a sleep state, such as the state corresponding to the scheduled charging mode.

[0130] In related technologies, if the charging gun is not unplugged from the charging socket, the controller will remain in a working state and will not be able to enter sleep mode, resulting in the vehicle's battery draining. However, in this application, even if the charging gun is not unplugged from the charging socket, when the voltage across the second resistor 213 is lower than the turn-on voltage of the first metal-oxide-semiconductor field-effect transistor 212 during the charging process, the controller will also control the power-off, automatically enter sleep mode, and record the charging data in the memory.

[0131] Wake up when charging gun is unplugged:

[0132] When the charging gun is plugged into the vehicle's charging socket, the voltage at voltage detection point A is U_CC2 = first resistor 24 / (charging gun resistance + first resistor 24) × U_KL30 = (1 / 3) × U_KL30. When the charging gun is unplugged from the charging socket, the charging gun's resistance is separated from the guiding circuit. At this time, the voltage at voltage detection point A is U_CC2 = (fourteenth resistor 281 + sixteenth resistor 283) / (first resistor 24 + fourteenth resistor 281 + sixteenth resistor 283) × U_KL30. The charging gun unplugging wake-up circuit 22 utilizes the principle that the voltage of a capacitor cannot change abruptly. When the voltage at voltage detection point A suddenly rises, the voltage U2 on the other side of the second capacitor 2266 will also rise along with the voltage at voltage detection point A. At this time, the voltage across the sixth resistor 2263 is: U_sixth resistor 2263 = U_gate GS of the third MOSFET 2261 = sixth resistor 2263 / (sixth resistor 2263 + seventh resistor 2264) × U_CC2. Since the voltage across the sixth resistor 2263 is greater than the turn-on voltage of the third MOSFET 2261, the third MOSFET 2261 is in the ON state. The voltage across the fourth resistor 223 is: U_fourth resistor 223 = U_gate GS of the second MOSFET 222 = fourth resistor 223 / (fourth resistor 223 + fifth resistor 224) × U_KL30. Since the voltage across the fourth resistor 223 is greater than the turn-on voltage of the second MOSFET 222, a wake-up enable signal is output to trigger the controller to enter the working state.

[0133] After the controller detects the wake-up enable signal output, it can also detect the voltage at voltage detection point A through voltage detection circuit 28. When it is determined from the voltage at voltage detection point A that the charging gun has indeed been unplugged from the charging socket, the controller exits the charging process and performs other safety monitoring tasks. The turn-on time of the second metal-oxide-semiconductor field-effect transistor 222 is equal to the duration of the wake-up enable signal, which depends on the discharge time of the second capacitor 2266. When the voltage U1 on the other side of the second capacitor 2266 gradually decreases to ground, that is, when the voltage across the sixth resistor 2263, i.e., U_sixth resistor 2263 = U_gate GS of the third metal-oxide-semiconductor field-effect transistor 2261 = sixth resistor 2263 / (sixth resistor 2263 + seventh resistor 2264) × U_CC2, is less than the turn-on voltage of the third metal-oxide-semiconductor field-effect transistor 2261, the wake-up enable signal is turned off, and the controller can then enter sleep mode again.

[0134] It should be noted that when the controller enters sleep mode, the fourth MOSFET 232 and the fifth MOSFET 236 remain in the ON state, so switch 23 is in the OFF state. When the controller controls switch 23 to open, the pin of the microcontroller unit 2416 is at a high level, so the fourth MOSFET 232 and the fifth MOSFET 236 are in the OFF state, and switch 23 is in the OFF state.

[0135] In the above embodiments of this application, the same charging detection circuit can be used to determine whether the charging gun is inserted into or removed from the charging socket based on the voltage at voltage detection point A, thereby simplifying the circuit structure of the charging system.

[0136] Finally, it should be noted that other embodiments of this application will readily conceive of by those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and alterations may be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A charging detection circuit, characterized in that, include: The charging gun activation circuit, the charging gun removal activation circuit, the switch, and the first resistor; The charging plug wake-up circuit and the charging plug wake-up circuit are respectively connected to the first end of the first resistor, and the second end of the first resistor is connected to the switch. In the conductive path where the charging gun wake-up circuit and the charging gun unplug wake-up circuit are respectively connected to the first end of the first resistor, a voltage detection point is provided. The voltage detection point is the position where the resistor in the charging gun is connected to the conductive path. The charging gun wake-up circuit is used to turn on when the switch is in the closed state and the voltage at the voltage detection point suddenly drops, so as to enter the charging process. The charging gun unplug wake-up circuit is used to activate when the switch is in the closed state and the voltage at the voltage detection point suddenly increases, so as to exit the charging process.

2. The charging detection circuit according to claim 1, characterized in that, The charging plug wake-up circuit includes: a first power supply, a first metal-oxide-semiconductor field-effect transistor, a second resistor, a third resistor, a first diode, and a first capacitor; The first power supply is connected to the first terminal of the second resistor and the source terminal of the first metal-oxide-semiconductor field-effect transistor, respectively, and the first diode is connected in parallel with the second resistor; The gate terminal of the first metal-oxide-semiconductor field-effect transistor is connected to the first terminal of the third resistor, and the second terminal of the second resistor is connected between the gate terminal of the first metal-oxide-semiconductor field-effect transistor and the first terminal of the third resistor. The second end of the third resistor is connected to the first end of the first capacitor, and the second end of the first capacitor is connected to the first end of the first resistor.

3. The charging detection circuit according to claim 2, characterized in that, It also includes a second diode; The first terminal of the second diode is connected to the drain terminal of the first metal-oxide-semiconductor field-effect transistor; The second terminal of the second diode is connected to the output circuit, which is used to output a charging enable signal.

4. The charging detection circuit according to claim 3, characterized in that, The charging gun unplug wake-up circuit includes: a second power supply, a second metal-oxide-semiconductor field-effect transistor, a fourth resistor, a fifth resistor, a third diode, and a voltage regulation circuit. The second power supply is connected to the first terminal of the fourth resistor and the source terminal of the second metal-oxide-semiconductor field-effect transistor, respectively, and the third diode is connected in parallel with the fourth resistor; The gate terminal of the second metal-oxide-semiconductor field-effect transistor is connected to the first terminal of the fifth resistor, and the second terminal of the fourth resistor is connected between the gate terminal of the second metal-oxide-semiconductor field-effect transistor and the first terminal of the fifth resistor; The second end of the fifth resistor is connected to the first end of the voltage regulation circuit, and the second end of the voltage regulation circuit is connected to the first end of the first resistor.

5. The charging detection circuit according to claim 4, characterized in that, The voltage regulation circuit includes: a third metal-oxide-semiconductor field-effect transistor, a fourth diode, a sixth resistor, a seventh resistor, a fifth diode, and a second capacitor; The drain terminal of the third metal-oxide-semiconductor field-effect transistor is connected to the second terminal of the fifth resistor; The gate terminal of the third metal-oxide-semiconductor field-effect transistor is connected to the first terminal of the sixth resistor and the first terminal of the seventh resistor, respectively. The second terminal of the seventh resistor is connected to the first terminal of the second capacitor, and the second terminal of the second capacitor is connected to the first terminal of the first resistor. The fourth diode is connected in parallel with the sixth resistor, and the fifth diode is connected in parallel between the gate and source terminals of the third metal-oxide-semiconductor field-effect transistor. The source terminal of the third metal-oxide-semiconductor field-effect transistor and the second terminal of the sixth resistor are respectively grounded.

6. The charging detection circuit according to claim 5, characterized in that, Also includes: Sixth diode; The first terminal of the sixth diode is connected to the drain terminal of the second metal-oxide-semiconductor field-effect transistor; The second terminal of the sixth diode is connected to the output circuit, which is also used to output a power-off enable signal.

7. The charging detection circuit according to claim 1, characterized in that, The switch includes: a third power supply, a fourth metal-oxide-semiconductor field-effect transistor, a seventh diode, an eighth resistor, a ninth resistor, a fifth metal-oxide-semiconductor field-effect transistor, an eighth diode, a tenth resistor, a ninth diode, and a turn-off circuit. The third power supply is connected to the source terminal of the fourth metal-oxide-semiconductor field-effect transistor and the first terminal of the eighth resistor, respectively. The gate terminal of the fourth metal-oxide-semiconductor field-effect transistor and the second terminal of the eighth resistor are connected to the first terminal of the ninth resistor, respectively. The seventh diode is connected in parallel with the eighth resistor. The drain terminal of the fourth metal-oxide-semiconductor field-effect transistor is connected to the second terminal of the first resistor. The second terminal of the ninth resistor is connected to the drain terminal of the fifth metal-oxide-semiconductor field-effect transistor, and the gate terminal of the fifth metal-oxide-semiconductor field-effect transistor is connected to the first terminal of the tenth resistor and the turn-off circuit, respectively. The eighth diode is connected in parallel with the tenth resistor, and the ninth diode is connected in parallel between the gate and source terminals of the fifth metal-oxide-semiconductor field-effect transistor. The source terminal of the fifth metal-oxide-semiconductor field-effect transistor and the second terminal of the tenth resistor are respectively grounded; The shutdown circuit is used to turn on the fourth metal-oxide-semiconductor field-effect transistor and the fifth metal-oxide-semiconductor field-effect transistor to make the switch closed; or, to turn off the fourth metal-oxide-semiconductor field-effect transistor and the fifth metal-oxide-semiconductor field-effect transistor to make the switch open.

8. The charging detection circuit according to claim 7, characterized in that, The shutdown circuit includes: a fourth power supply, an eleventh resistor, a transistor, a twelfth resistor, a thirteenth resistor, and a microcontroller unit; The fourth power supply is connected to the first end of the eleventh resistor, and the second end of the eleventh resistor is connected to the gate end of the fifth metal-oxide-semiconductor field-effect transistor and the collector end of the transistor, respectively. The base terminal of the transistor is connected to the first terminal of the twelfth resistor and the first terminal of the thirteenth resistor, respectively, and the second terminal of the thirteenth resistor is connected to the microcontroller unit. The emitter terminal of the transistor and the second terminal of the twelfth resistor are respectively grounded.

9. The charging detection circuit according to any one of claims 1-8, characterized in that, It also includes a voltage detection circuit; The voltage detection circuit is connected to the first end of the first resistor and is used to detect the voltage at the voltage detection point.

10. A charging socket, characterized in that, Includes the charging detection circuit as described in any one of claims 1-9.

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