Battery identification circuit and vehicle equipment

Abstract

This application relates to the field of new energy technology, disclosing a battery identification circuit and vehicle equipment. The battery identification circuit includes a first identification module, a second identification module, and a trigger control module. When the battery voltage type is a first type, the first identification module enters a conducting state based on a second voltage output from a first port to output a second identification voltage reflecting whether the battery is about to enter a charging state or has already entered a charging state. When the battery voltage type is a second type, the second identification module enters a conducting state based on a fourth voltage output from the first port to output a third identification voltage reflecting whether the battery is about to enter a charging state or has already entered a charging state. Through the coordinated operation of the first identification module, the second identification module, and the trigger control module, this application enables the battery identification circuit to adaptively identify the battery voltage type and operating state, is compatible with the connection of various batteries, and improves the application range of the battery identification circuit.

Description

Technical Field

[0001] This application relates to the field of new energy technology, specifically to a battery identification circuit and vehicle equipment. Background Technology

[0002] New energy vehicles are equipped with on-road fast charging devices that can recover the electrical energy generated by the vehicle and charge its battery. For efficient and safe charging, these devices need to obtain the battery's voltage type and operating status. Related technologies are customized to the voltage type of new energy vehicles; however, given the wide variety of battery voltage types on the market, these customized fast charging devices lack the ability to identify the battery's voltage type and operating status, thus failing to provide efficient and safe adaptive charging for batteries of various voltage types. Summary of the Invention

[0003] To address the aforementioned technical problems, embodiments of this application provide a battery identification circuit and vehicle equipment, improving upon the limitations of related technologies in adaptively identifying the voltage type and operating status of batteries.

[0004] In a first aspect, embodiments of this application provide a battery identification circuit, including: a first identification module, a second identification module, and a trigger control module. The first identification module and the second identification module are connected in parallel between a first port and a reference voltage. The trigger control module is connected to the first identification module and a second port for connecting to a battery. The battery voltage type includes a first type and a second type with a working voltage range greater than the first type. The voltage range of the first port responds to the battery type and the activation state of a control system for charging the battery. When the battery voltage type is the first type, the first identification module is used to enter a cutoff state based on the first voltage output from the first port to output a first identification voltage reflecting that the battery is in a discharging state. It is also used to input a first identification voltage based on the first voltage output from the first port. The second voltage output enters the conduction state to output a second identification voltage that reflects when the battery is about to enter the charging state or has already entered the charging state. The second voltage is greater than the first voltage. When the battery voltage type is the second type, the trigger control module is used to enter the conduction state based on the third voltage output from the second port to control the first identification module to turn off, so that the first identification module outputs the first identification voltage that the battery is in the discharging state. The second identification module is used to enter the conduction state based on the fourth voltage output from the first port to output a third identification voltage that reflects when the battery is about to enter the charging state or has already entered the charging state. The first identification voltage is the reference voltage, the third voltage is greater than the second voltage but less than the fourth voltage, and the second identification voltage is different from the third identification voltage.

[0005] Optionally, the first identification module includes a first voltage regulator unit and a first switching unit. The first voltage regulator unit is connected to a first port, and the control terminal and output terminal of the first switching unit are respectively connected to the first voltage regulator unit and a reference voltage. The first voltage regulator unit is used to control the first switching unit to be turned off based on a first voltage. The first voltage regulator unit is also used to control the first switching unit to be turned on based on a second voltage reverse breakdown. The first switching unit is used to output a first identification voltage when turned off and to output a second identification voltage when turned on.

[0006] Optionally, the first voltage regulator unit includes a first Zener diode and a first resistor. The anode and cathode of the first Zener diode are respectively connected to the first port and the first end of the first resistor, and the second end of the first resistor is connected to the control terminal of the first switching unit.

[0007] Optionally, the battery identification circuit further includes a first voltage divider unit and a second voltage divider unit. The first switching unit includes a first charging unit and a first switching transistor. The first charging unit is connected to the control terminals of the first voltage regulator unit and the first switching transistor. The first output terminal of the first switching transistor and the second identification module are both connected to a reference voltage through the first voltage divider unit. The second output terminal of the first switching transistor is grounded through the second voltage divider unit. The first voltage regulator unit is used to conduct based on the reverse breakdown of the second voltage. The first charging unit is used to charge for a first preset time when the first voltage regulator unit is turned on. The first switching unit is used to enter the conducting state based on the voltage at both ends after the first charging unit performs the charging operation for the first preset time, so as to conduct the voltage divider branch between the first voltage divider unit and the second voltage divider unit. The second output terminal of the first switching transistor outputs the second identification voltage based on the voltage division generated by the second voltage divider unit on the voltage divider branch.

[0008] Optionally, the trigger control module includes a second voltage regulator unit, a second charging unit, and a second switching transistor; the second charging unit is connected to the control terminal of the second switching transistor, the input terminal of the second voltage regulator unit is connected to the second port, and the output terminal of the second switching transistor is connected to the control terminal of the first switching transistor; the output terminal of the second voltage regulator unit is connected at the connection between the second charging unit and the second switching transistor; the second reverse breakdown value of the second voltage regulator unit is greater than the first reverse breakdown value of the first voltage regulator unit; the second voltage regulator unit is used to conduct based on the third voltage reverse breakdown, and the second charging unit is used to charge for a second preset time when the second voltage regulator unit is conducting, the second preset time being less than the first preset time; the second switching transistor is used to enter the conduction state based on the voltage across its terminals after the second charging unit performs the charging operation for the second preset time, so as to control the voltage across its terminals of the first charging unit to be a low-level signal, the low-level signal being used to control the first switching transistor to be cut off to output a first identification voltage, the third identification voltage being a low-level signal, the third identification voltage being less than the second identification voltage.

[0009] Optionally, the first charging unit includes a second resistor and a first capacitor, and the second charging unit includes a third resistor and a second capacitor. The first end of the second resistor is connected to the control terminal of the first switching transistor, and the first end of the first capacitor is connected to the control terminal of the first switching transistor. The second ends of the second resistor and the second ends of the first capacitor are both grounded. The first end of the third resistor is connected to the control terminal of the second switching transistor, and the first end of the second capacitor is connected to the control terminal of the second switching transistor. The second ends of the third resistor and the second ends of the second capacitor are both grounded.

[0010] Optionally, the second identification module includes a third voltage regulator unit and a second switching unit; the third voltage regulator unit is connected to the control terminal of the first port and the second switching unit, and the output terminal of the second switching unit is connected to a reference voltage through a first voltage divider unit; the third voltage regulator unit is used to control the second switching unit to conduct based on a fourth voltage reverse breakdown, and the third reverse breakdown value of the third voltage regulator unit is greater than the second reverse breakdown value of the second voltage regulator unit; the second switching unit is used to output a third identification voltage when it is on.

[0011] Optionally, the battery identification circuit further includes a first diode, a second diode, and a third diode. The anode of the first diode is connected to the output terminal of the first voltage regulator unit and the second switching transistor, and the cathode of the first diode is connected to the control terminal of the first switching transistor. The anode of the second diode is connected to the second port, and the cathode of the second diode is connected to the second voltage regulator unit. The anode of the third diode is connected to the first port, and the cathode of the third diode is connected to the first voltage regulator unit and the third voltage regulator unit.

[0012] Optionally, the battery identification circuit further includes a display unit, which is connected to the reference voltage and the first voltage divider unit; the display unit is used to turn on and emit light when the first identification module outputs the second identification voltage or the second identification module outputs the third identification voltage.

[0013] In a second aspect, embodiments of this application provide a vehicle device including an automobile engine and the aforementioned battery identification circuit. The control system includes the automobile engine, and the battery identification circuit is used to identify the type of battery in the vehicle device and whether it is about to enter a charging state or has already entered a charging state.

[0014] The beneficial effects of this application's embodiments are as follows: Through the coordinated cooperation between the first identification module, the second identification module, and the trigger control module, the battery identification circuit can adaptively identify the battery's voltage type and operating state, ensuring compatibility with various battery connections and expanding the application range of the battery identification circuit. This application's embodiments do not require software configuration to output information about the battery's voltage type and operating state; instead, they employ hardware circuitry, through the coordinated cooperation between the first identification module, the second identification module, and the trigger control module, to quickly and accurately output the first identification voltage, the second identification voltage, and the third identification voltage. Attached Figure Description

[0015] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0016] Figure 1 This application provides a schematic diagram of the circuit structure of a vehicle device according to an embodiment of the present application.

[0017] Figure 2 A schematic diagram of the circuit structure of a battery identification circuit provided in an embodiment of this application;

[0018] Figure 3 A schematic diagram of the circuit structure of a battery identification circuit provided in another embodiment of this application;

[0019] Figure 4 This is a schematic diagram of the specific circuit structure of a battery identification circuit provided in an embodiment of this application;

[0020] Figure 5 A schematic diagram of the circuit structure of a battery identification circuit provided in another embodiment of this application;

[0021] Figure 6 A schematic diagram of the circuit structure of a battery identification circuit provided in another embodiment of this application;

[0022] Figure 7 A schematic diagram of the circuit structure of a battery identification circuit provided in another embodiment of this application;

[0023] Figure 8 A schematic diagram of the circuit structure of a battery identification circuit provided in another embodiment of this application;

[0024] Figure 9 A schematic diagram of the circuit structure of a battery identification circuit provided in another embodiment of this application;

[0025] Figure 10 A schematic diagram of the circuit structure of a battery identification circuit provided in another embodiment of this application;

[0026] Figure 11 A schematic diagram of the circuit structure of a battery identification circuit provided in another embodiment of this application;

[0027] Figure 12 This is a schematic diagram of the circuit structure of a battery identification circuit provided in another embodiment of this application. Detailed Implementation

[0028] To facilitate understanding of this application, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as being "electrically connected" to another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "upper," "lower," "inner," "outer," "bottom," etc., used in this specification indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items. Furthermore, technical features involved in the different embodiments of this application described below may be combined with each other as long as they do not conflict with each other.

[0030] The following embodiments of this application provide a vehicle device, which is a new energy vehicle, including pure electric vehicles, hybrid electric vehicles, etc. Please refer to... Figure 1 The vehicle equipment 100 includes an automobile engine 200, an automobile generator 300, an electronic control unit 400, a battery 500, a battery identification circuit 600, and a vehicle fast charging device 700.

[0031] The car engine 200 is connected to the car alternator 300. The car engine 200 is used to start up based on the electrical energy provided by the battery 500. When the car engine 200 starts up, it drives the rotor of the car alternator 300 to rotate at high speed via a belt.

[0032] The automotive alternator 300 is connected to both the battery 500 and the fast-charging device 700. It converts the mechanical energy generated by the automotive engine 200 into electrical energy, driven by the engine 200. The alternator 300 charges the battery 500, compensating for the energy loss during engine startup, and also supplies power to other electrical devices in the vehicle, including headlights, air conditioning, and vehicle controllers.

[0033] The automotive alternator 300 has a first port 31, which is the D+ port (i.e., the excitation port). When the automotive engine 200 starts and the automotive alternator 300 is working normally, the first port 31 outputs a target voltage. The target voltage output by the first port 31 can serve as an indicator for the vehicle fast charging device 700 to detect whether the automotive alternator 300 has started.

[0034] The Electronic Control Unit (ECU) 400 is communicatively connected to the vehicle engine 200 and the vehicle alternator 300, respectively, and is used to control the operating status of the vehicle engine 200 and the vehicle alternator 300. The vehicle engine 200, the vehicle alternator 300, and the ECU 400 can form the control system of the vehicle equipment 100, and the control system can adjust the output voltage of the first port 31.

[0035] It is worth noting that battery 500 is used to provide starting voltage for starting the vehicle engine 200. When battery 500 is in a discharged state, its electrical energy can be used to start the engine. The voltage type of battery 500 includes a first type and a second type with an operating voltage range greater than the first type. The first type includes 12V and 24V types. For example, when the output voltage of battery 500 is 12V, the voltage type of battery 500 is 12V. When the output voltage of battery 500 is 24V, the voltage type of battery 500 is 24V. The following description, based on embodiments of this application, explains the voltage output of the first port 31 in conjunction with the 12V and 24V voltage types:

[0036] 1) Assuming the battery type is 12V:

[0037] When the vehicle engine 200 is not started, the control system configures the target voltage output of the first port 31 to be lower than 12V. When the vehicle engine 200 starts and the vehicle alternator 300 is working normally, the target voltage output of the first port 31 is stabilized within the voltage range of 13V-14.8V. For example, at the moment the vehicle engine 200 starts, the target voltage output of the first port 31 is greater than 14.8V, such as 15V. However, during subsequent operation, the target voltage output of the first port 31 stabilizes within the voltage range of 13V-14.8V.

[0038] 2) Assuming the battery type is 24V:

[0039] When the vehicle engine 200 is not started, the control system configures the target voltage output of the first port 31 to be below 24V. When the vehicle engine 200 starts and the vehicle alternator 300 is working normally, the target voltage output of the first port 31 is stabilized within the voltage range of 28V-29.6V. For example, at the instant the vehicle engine 200 starts, the target voltage output of the first port 31 is greater than 29.6V, for example, the target voltage output of the first port 31 is 30V. However, during subsequent operation, the target voltage output of the first port 31 stabilizes within the voltage range of 28V-29.6V.

[0040] The battery identification circuit 600 is connected to the first port 31 and the second port 51 of the battery 500, respectively, and is used to output type status information based on the voltage output from the first port 31 and the voltage output from the second port 51. The type status information is used to indicate the voltage type of the battery 500 and the operating status of the battery 500.

[0041] The vehicle fast charging device 700 is a charger that includes a charging circuit for controlling battery charging. The vehicle fast charging device 700 is connected to a battery identification circuit 600 and is used to receive type status information output by the battery identification circuit 600, and enter the corresponding charging mode based on the type status information. For example, the vehicle fast charging device 700 charges battery 500 or other batteries of the same type as battery 500 in the vehicle device 100 in the corresponding charging mode; understandably, 12V batteries and 24V batteries correspond to different charging modes.

[0042] Please see Figure 2 The battery identification circuit 600 includes a first identification module 61, a second identification module 62, and a trigger control module 63.

[0043] The first identification module 61 and the second identification module 62 are connected in parallel between the first port and the reference voltage, which is the voltage provided by the vehicle equipment. For example, the reference voltage is 3.3V.

[0044] The trigger control module 63 connects to the first identification module 61 and a second port 51 for connecting to the battery 500. The second port 51 is the voltage output port of the battery 500. The voltage type of the battery 500 includes a first type and a second type with a working voltage range greater than that of the first type. That is, the working voltage range of the battery corresponding to the first type is less than that of the battery corresponding to the second type. For example, the first type is 12V and the second type is 24V. The working voltage range of the battery corresponding to the 12V type is less than that of the battery corresponding to the 24V type.

[0045] The voltage range of the first port 31 responds to the type of battery 500 and the startup state of the control system for charging battery 500. The control system is equipped with the automobile engine 200 described in the above embodiments. The voltage range of the first port 31 is related to the type of battery 500 and the startup state of automobile engine 200. As mentioned above, assuming the voltage type of battery 500 is 12V: when automobile engine 200 is not running, the target voltage output by the first port 31 is lower than 12V. When automobile engine 200 is running and automobile alternator 300 is operating normally, the target voltage output by the first port 31 is stable within the voltage range of 13V-14.8V. Assuming the voltage type of battery 500 is 24V: when automobile engine 200 is not running, the target voltage output by the first port 31 is lower than 24V. When automobile engine 200 is running and automobile alternator 300 is operating normally, the target voltage output by the first port 31 is stable within the voltage range of 28V-29.6V.

[0046] When the voltage type of battery 500 is type one, the first identification module 61 is used to enter a cutoff state based on the first voltage output from the first port 31 to output a first identification voltage reflecting that battery 500 is in a discharging state. For example... Figure 2 As shown, the first identification module 61 outputs the first identification voltage through the D+_IN node.

[0047] The first voltage is the voltage output from the first port 31 when the battery 500 of the first type is in a discharging state. For example, when the first type is a 12V type, the first voltage is a voltage value less than 12V.

[0048] The discharge state means that battery 500 can be used to start the car engine. The voltage value of the first identification voltage is constrained by the circuit structure of the first identification module 61. For example, the first identification voltage is equal to the reference voltage. When the reference voltage is 3.3V, the first identification voltage is 3.3V. When the car engine 200 is not started, battery 500 is in a discharge state. Under the action of the first voltage output from the first port 31, the first identification module 61 outputs a first identification voltage of 3.3V.

[0049] In some embodiments, the first identification module 61 is further configured to enter a conduction state based on the second voltage output from the first port 31 to output a second identification voltage reflecting whether the battery 500 will enter a charging state or has already entered a charging state. For example... Figure 2 As shown, the first identification module 61 outputs the second identification voltage through the D+_IN node.

[0050] The second voltage is the voltage output from the first port 31 when the first type of battery 500 is about to enter or has already entered the charging state. The second voltage is greater than the first voltage. When the first type is 12V, the second voltage is a voltage value greater than 13V but less than 14.8V.

[0051] The charging state refers to the state in which the electrical energy generated by the car engine 200 driving the car alternator 300 charges the battery 500. The voltage value of the second identification voltage is also constrained by the circuit structure of the first identification module 61, wherein the second identification voltage is different from the first identification voltage. For example, the second identification voltage may be less than the first identification voltage, or the second identification voltage may be greater than the first identification voltage. For instance, the first identification voltage is 3.3V, and the second identification voltage is 2.1V.

[0052] When the car engine 200 starts, the battery 500 starts charging. The first identification module 61 outputs a second identification voltage under the influence of the second voltage output from the first port 31.

[0053] The vehicle fast charging device 700 determines that the car engine 200 has entered the start-up state based on the second identification voltage.

[0054] When the car engine 200 starts, the car generator 300 generates electrical energy under the drive of the car engine 200. This electrical energy is then transferred to the battery 500 to charge it. Therefore, in this embodiment, the second identification voltage output by the first identification module 61 can accurately and reliably reflect whether the voltage type of the battery 500 is the first type and whether the battery 500 is about to enter a charging state or has already entered a charging state. This facilitates the vehicle fast charging device 700 to quickly switch to the charging mode corresponding to the first type and charge the battery 500 or other batteries according to the charging mode corresponding to the first type.

[0055] It is worth noting that when the voltage type of battery 500 is the first type, the voltage of the second port 51 is not enough to drive the trigger control module 63 to work. Therefore, the trigger control module 63 enters the cut-off state in this case.

[0056] When the voltage type of battery 500 is the second type, the trigger control module 63 is used to enter the conduction state based on the third voltage output from the second port 51 to control the first identification module 61 to be cut off, so that the first identification module 61 outputs the first identification voltage in which battery 500 is in the discharge state.

[0057] The third voltage is the voltage output from the second port 51 when the second type of battery 500 is in a discharging state. The third voltage is greater than the second voltage. When the second type is 24V, the third voltage is 24V.

[0058] As previously described, the first identification module 61 can enter a conducting state based on a second voltage that is lower than the third voltage, and output a second identification voltage that reflects when the battery is about to enter a charging state or has already entered a charging state. To prevent the first identification module 61 from still outputting the second identification voltage when the trigger control module 63 is applying the third voltage, the trigger control module 63 needs to control the first identification module 61 to turn off, so that the first identification module 61 outputs the first identification voltage, so as to accurately reflect that the battery 500 is in a discharging state.

[0059] The second identification module 62 is used to enter a conducting state based on the fourth voltage output from the first port 31 to output a third identification voltage reflecting whether the battery 500 is about to enter a charging state or has already entered a charging state. Simultaneously, the trigger control module 63 is used to enter a conducting state based on the third voltage output from the second port 51 to control the first identification module 61 to turn off. Figure 2 As shown, the second identification module 62 outputs the third identification voltage through the D+_IN node.

[0060] The fourth voltage is the voltage output from the first port 31 when the second type of battery 500 is about to enter or has already entered the charging state. The fourth voltage is greater than the third voltage. When the second type is 24V, the fourth voltage is a voltage value greater than 28V but less than 29.6V.

[0061] The third identification voltage is different from the second identification voltage, and also different from the first identification voltage. In some embodiments, the third identification voltage is a low-level signal, which is lower than the second identification voltage. For example, the third identification voltage is 0V, the second identification voltage is 2.1V, and the first identification voltage is 3.3V.

[0062] As mentioned earlier, the trigger control module 63 enters the conducting state under the action of the third voltage to control the first identification module 61 to turn off. When the second type is 24V, the battery 500 can apply a 24V voltage to the trigger control module 63 through the second port 51, causing the trigger control module 63 to enter the conducting state to control the first identification module 61 to turn off. This helps the second identification module 62 to reliably and accurately output the third identification voltage that reflects whether the battery 500 is about to enter the charging state or has already entered the charging state.

[0063] In this embodiment, the trigger control module 63 and the first identification module 61 work together to ensure that the second identification module 62 reliably and accurately outputs a third identification voltage that reflects whether the battery 500 is about to enter a charging state or has already entered a charging state. The third identification voltage accurately and reliably reflects whether the voltage type of the battery 500 is the second type and whether the battery 500 is about to enter a charging state or has already entered a charging state. This facilitates the vehicle fast charging device 700 to quickly switch to the charging mode corresponding to the second type and charge the battery 500 or other batteries according to the charging mode corresponding to the second type.

[0064] In summary, this application embodiment does not require software configuration to notify the vehicle fast charging device 700 about the voltage type and working status of the battery 500. Instead, it uses hardware circuitry to quickly and accurately output the first identification voltage, the second identification voltage, and the third identification voltage through the coordinated cooperation between the first identification module 61, the second identification module 62, and the trigger control module 63.

[0065] In addition, through the coordinated cooperation between the first identification module 61, the second identification module 62 and the trigger control module 63, the battery identification circuit 600 can adaptively identify the voltage type and working state of the battery 500, and is compatible with the access of multiple batteries, thereby improving the application range of the battery identification circuit 600. At the same time, it eliminates the need for special customization of the vehicle fast charging device 700, which also helps to expand the application range of the vehicle fast charging device 700.

[0066] Please see Figure 3 The first identification module 61 includes a first voltage regulator unit 611 and a first switching unit 612. The first voltage regulator unit 611 is connected to the first port 31. The control terminal and the output terminal of the first switching unit 612 are respectively connected to the first voltage regulator unit 611 and the reference voltage.

[0067] The first voltage regulator unit 611 is used to control the first switching unit 612 to turn off based on the first voltage cutoff, and the first switching unit 612 is used to output the first identification voltage when it is cut off.

[0068] The first voltage regulator unit 611 is configured with a first reverse breakdown value. Since the first voltage is less than the first reverse breakdown value, the first voltage regulator unit 611 is not reverse-broken by the first voltage. Therefore, the first voltage regulator unit 611 enters a cutoff state, which further triggers the first switching unit 612 to enter a cutoff state. When the first switching unit 612 enters the cutoff state, the first switching unit 612 outputs a first identification voltage. The first reverse breakdown value is customized by the designer based on engineering experience; for example, the first reverse breakdown value is 13V.

[0069] The first voltage regulator unit 611 is also used to control the first switching unit 612 to turn on based on the reverse breakdown of the second voltage. The first switching unit 612 is also used to output the second identification voltage when it is turned on.

[0070] Since the second voltage is greater than or equal to the first reverse breakdown value, the first voltage regulator unit 611 is reverse-broken down by the second voltage. Therefore, the first voltage regulator unit 611 enters the conducting state, which further triggers the first switching unit 612 to enter the conducting state. When the first switching unit 612 enters the conducting state, the first switching unit 612 outputs the second identification voltage.

[0071] The first reverse breakdown value of the first voltage regulator unit 611 not only provides a dividing point for whether the battery voltage type is the first type and whether the working state is the charging state during the above process, but also plays a voltage regulation role, protecting the first switching unit 612 from the impact of surge voltage from the first port 31.

[0072] Please see Figure 4 The first voltage regulator unit 611 includes a first voltage regulator diode ZD1 and a first resistor R1. The anode and cathode of the first voltage regulator diode ZD1 are respectively connected to the first port 31 and the first end of the first resistor R1. The second end of the first resistor R1 is connected to the control terminal of the first switching unit 612.

[0073] Combined with reference Figure 3 and Figure 4 The working principle of the first voltage regulator unit 611 is as follows:

[0074] When the control system configures the first port 31 to output a first voltage, the first voltage is less than the first reverse breakdown value of the first Zener diode ZD1. Therefore, the first Zener diode ZD1 enters the cutoff state. When the first Zener diode ZD1 enters the cutoff state, the first switching unit 612 does not meet the conduction condition and enters the cutoff state. The first switching unit 612 outputs the reference voltage as the first identification voltage.

[0075] When the first port 31 outputs the second voltage, the second voltage is greater than the first reverse breakdown value of the first Zener diode ZD1. Therefore, the first Zener diode ZD1 enters the conducting state. When the first Zener diode ZD1 enters the conducting state, the first switching unit 612 enters the conducting state under the action of the second voltage. The first switching unit 612 generates a second identification voltage based on the reference voltage and outputs the second identification voltage.

[0076] When the control system is configured to output a fourth voltage at the first port 31, this fourth voltage is greater than the first reverse breakdown value of the first Zener diode ZD1. Therefore, the first Zener diode ZD1 enters the conducting state. Simultaneously, the output of the fourth voltage at the first port 31 implicitly indicates that the battery 500's voltage type is 24V. The second port 51 serves as the voltage output port of the battery 500, and its output third voltage is 24V. The trigger control module 63 enters the conducting state under the influence of this third voltage, thereby clamping the first switching unit 612 into the off state.

[0077] In this embodiment, the first voltage regulator unit 611 is configured using the first Zener diode ZD1 and the first resistor R1. The components used are relatively simple and scientific, which helps to reduce the hardware cost of the battery identification circuit 600.

[0078] Please see Figure 5 The battery identification circuit 600 also includes a first voltage divider unit 64 and a second voltage divider unit 65, and the first switching unit 612 includes a first charging unit 6121 and a first switching transistor 6122.

[0079] The first charging unit 6121 is connected to the control terminal of the first voltage regulator unit 611 and the first switching transistor 6122. The first output terminal of the first switching transistor 6122 and the second identification module 62 are both connected to the reference voltage through the first voltage divider unit 64. The second output terminal of the first switching transistor 6122 is grounded through the second voltage divider unit 65.

[0080] The first voltage regulator unit 611 is used to conduct in reverse breakdown based on the second voltage, and the first charging unit 6121 is used to charge for a first preset time when the first voltage regulator unit 611 is turned on.

[0081] The first preset time is the charging time after the first charging unit 6121 performs the charging operation, reaching a point where it can trigger the first switching unit 612 to enter the conducting state. It can be understood that the first preset time can be the charging time when the first charging unit 6121 enters the fully charged state, or it can be the charging time when the first charging unit 6121 has not yet reached the fully charged state. For example, the on-state voltage drop of the first switching unit 6122 is 0.7V, and the charging time when the first charging unit 6121 enters the fully charged state is t1. When the first charging unit 6121 enters the fully charged state, the voltage across the first charging unit 6121 is 1V or 2V. When the charging time of the first charging unit 6121 is t2, the voltage across the first charging unit 6121 is 0.7V, where t2 is less than t1, and the first preset time is t2.

[0082] The first switching unit 612 is used to enter the conduction state based on the voltage at both ends after the first charging unit 6121 performs a charging operation for a first preset time, so as to conduct the voltage divider branch 50a between the first voltage divider unit 64 and the second voltage divider unit 65. The second output terminal of the first switching tube 6122 outputs a second identification voltage based on the voltage division generated by the second voltage divider unit 65 on the voltage divider branch 50a.

[0083] When the first switching unit 612 is triggered by the first charging unit 6121 and enters the conducting state, the first voltage divider unit 64 and the second voltage divider unit 65 form a voltage divider branch 50a. Under the action of the reference voltage, the voltage divider branch 50a causes the second voltage divider unit 65 to generate a voltage divider. Based on this voltage divider, the first switching transistor 6122 outputs a second identification voltage.

[0084] In this embodiment of the application, when the first switch 6122 is turned on, the first voltage divider unit 64 and the second voltage divider unit 65 are controlled to form a voltage divider branch 50a so as to output a second identification voltage that is different from the first identification voltage. This helps to improve the recognition between the second identification voltage and the first identification voltage, so that the vehicle fast charging device 700 can accurately distinguish between the first identification voltage and the second identification voltage, thereby enabling it to adopt a more accurate charging mode.

[0085] Please see Figure 6 The battery identification circuit 600 also includes a first reverse connection protection circuit 66, which is connected between the first voltage regulator unit 611 and the first switch unit 612. When the battery 500 is reverse connected to the second port 51, the first switch unit 612 is disconnected from the current loop between the battery 500 and the first switch unit 612 to avoid the first switch unit 612 being subjected to excessive current stress, thereby protecting the first switch unit 612 and preventing the first switch unit 612 from being damaged by excessive current.

[0086] Please continue reading. Figure 4 The first charging unit 6121 includes a second resistor R2 and a first capacitor C1. The first end of the second resistor R2 is connected to the control terminal of the first switching transistor 6122, and the first end of the first capacitor C1 is connected to the control terminal of the first switching transistor 6122. The second ends of the second resistor R2 and the second ends of the first capacitor C1 are both grounded.

[0087] Please continue reading. Figure 4 The first voltage divider unit 64 includes a first voltage divider resistor Rf1, and the second voltage divider unit 65 includes a second voltage divider resistor Rf2. A reference voltage is applied to the first end of the first voltage divider resistor Rf1, the second end of the first voltage divider resistor Rf1 is connected to the first output terminal of the first switching transistor 6122, the first end of the second voltage divider resistor Rf2 is connected to the second output terminal of the first switching transistor 6122, and the second voltage divider resistor Rf2 is grounded.

[0088] The first switching transistor 6122 can be a transistor, MOSFET, or IGBT, etc.

[0089] Please continue reading. Figure 4 The first switching transistor 6122 is a first NPN transistor Q1. The base of the first NPN transistor Q1 is the control terminal, the first output terminal is the collector, and the second output terminal is the emitter. The base of the first NPN transistor Q1 is connected to the first terminal of the second resistor R2 and the first terminal of the first capacitor C1. A reference voltage is applied to the collector of the first NPN transistor Q1, and the emitter of the first NPN transistor Q1 is connected to the first terminal of the second voltage divider resistor Rf2.

[0090] This application's embodiments are combined with Figure 4 The working principle of the first identification module 61 is explained as follows:

[0091] When the control system outputs a first voltage at port 31, the first voltage is less than the first reverse breakdown value of the first Zener diode ZD1. Therefore, the first Zener diode ZD1 enters the cutoff state. When the first Zener diode ZD1 enters the cutoff state, the first NPN transistor Q1 also enters the cutoff state. When the first NPN transistor Q1 enters the cutoff state, the collector voltage of the first NPN transistor Q1 is raised to a reference voltage, where the collector voltage of the first NPN transistor Q1 is the first identification voltage, i.e., the first identification voltage is 3.3V. The vehicle fast charging device 700 detects the first identification voltage at the collector of the first NPN transistor Q1.

[0092] When the control system configures the first port 31 to output a second voltage, the second voltage is greater than the first reverse breakdown value of the first Zener diode ZD1. Therefore, the first Zener diode ZD1 enters the conducting state. When the first Zener diode ZD1 enters the conducting state, the first capacitor C1 is charged through the second resistor R2. At the same time, the voltage at the base of the first NPN transistor Q1 increases along with the voltage across the first capacitor C1. When the voltage across the first capacitor C1 is greater than the forward voltage drop of the first NPN transistor Q1 (0.7V), the first NPN transistor Q1 enters the conducting state. When the first NPN transistor Q1 enters the conducting state, the first voltage divider resistor Rf1 and the second voltage divider resistor Rf2 form a voltage divider branch 50a. Under the action of the reference voltage, the collector voltage of the first NPN transistor Q1 is V1 = 3.3V / (Rf1+Rf2)*Rf2, where V1 is the second identification voltage, which is less than the reference voltage 3.3V.

[0093] Please see Figure 7The trigger control module 63 includes a second voltage regulator unit 631, a second charging unit 632, and a second switching transistor 633. The second charging unit 632 is connected to the control terminal of the second switching transistor 633. The input terminal of the second voltage regulator unit 631 is connected to the second port 51, and the output terminal of the second switching transistor 633 is connected to the control terminal of the first switching transistor 6122. The output terminal of the second voltage regulator unit 631 is connected at the junction between the second charging unit 632 and the second switching transistor 633. The second reverse breakdown value of the second voltage regulator unit 631 is greater than the first reverse breakdown value of the first voltage regulator unit 611. For example, the second reverse breakdown value is 24V, and the first reverse breakdown value is 13V.

[0094] The second voltage regulator unit 631 is used to conduct based on reverse breakdown of the third voltage. The second charging unit 632 is used to charge for a second preset time when the second voltage regulator unit 631 is turned on, the second preset time being less than the first preset time. The second switch 633 is used to enter the on state based on the voltage across its terminals after the second charging unit 632 performs the charging operation for the second preset time, so as to control the voltage across the first charging unit 6121 to be a low-level signal. The low-level signal is used to control the first switch 6122 to be turned off to output the first identification voltage.

[0095] The second preset time is the charging time after the second charging unit 632 performs the charging operation, which is sufficient to trigger the second switch 633 to enter the conducting state. It can be understood that the second preset time can be the charging time when the second charging unit 632 enters the fully charged state, or it can be the charging time when the second charging unit 632 has not yet reached the fully charged state.

[0096] Because the third voltage is greater than the second reverse breakdown value of the second voltage regulator unit 631, the second voltage regulator unit 631 is reversely broken down and enters the conduction state, and the second charging unit 632 enters the charging state. After a charging operation for a second preset time, the voltage across the second charging unit 632 is greater than or equal to the on-state voltage drop of the second switch 633, which can trigger the second switch 633 to enter the conduction state. When the second switch 633 enters the conduction state, it pulls down the voltage across the first charging unit 6121, making the voltage across the first charging unit 6121 a low-level signal. Under the action of the low-level signal, the control terminal of the first switch 6122 enters the cutoff state, thereby outputting the first identification voltage.

[0097] Please continue reading. Figure 4 The second charging unit 632 includes a third resistor R3 and a second capacitor C2. The first end of the third resistor R3 is connected to the control terminal of the second switch 633, and the first end of the second capacitor C2 is connected to the control terminal of the second switch 633. The second ends of the third resistor R3 and the second ends of the second capacitor C2 are both grounded.

[0098] Please continue reading. Figure 4 The second voltage regulator unit 631 includes a second Zener diode ZD2 and a fourth resistor R4. The anode of the second Zener diode ZD2 is connected to the first end of the fourth resistor R4. The cathode of the second Zener diode ZD2 is applied with the voltage output from the second port 51. The second end of the fourth resistor R4 is connected to the control terminal of the second switch 633.

[0099] Please continue reading. Figure 4 The second switching transistor 633 is a second NPN transistor Q2. The base of the second NPN transistor Q2 is the control terminal, and the collector of the second NPN transistor Q2 is the output terminal. The base of the second NPN transistor Q2 is connected to the second terminal of the fourth resistor R4. The collector of the second NPN transistor Q2 is used to control the voltage of the base of the first NPN transistor Q1. The emitter and collector of the second NPN transistor Q2 are grounded.

[0100] This application's embodiments are combined with Figure 4 The working principle of the trigger control module 63 is explained as follows:

[0101] 1) The control system is configured to output a first voltage at the first port 31 and output a voltage at the second port 51 that is less than the second reverse breakdown value of the second Zener diode ZD2. Therefore, both the second Zener diode ZD2 and the second NPN transistor Q2 are in the cutoff state.

[0102] This situation occurs when the battery 500 is 12V and the car engine 200 is not running, and the battery 500 is discharging. The first voltage is less than 12V, and the voltage output from the second port 51 is 12V.

[0103] 2) The control system is configured to output a second voltage at the first port 31. The voltage output at the second port 51 is greater than the first reverse breakdown value of the first Zener diode ZD1 but less than the second reverse breakdown value of the second Zener diode ZD2. Therefore, both the second Zener diode ZD2 and the second NPN transistor Q2 are in the cutoff state.

[0104] This situation occurs when the battery 500 has a voltage type of 12V and the car engine 200 is started, and the battery 500 is about to enter the charging state or has already entered the charging state. The second voltage is a voltage value greater than 13V but less than 14.8V, and the voltage output from the second port 51 is 12V.

[0105] 3) The control system is configured such that the voltage output from the first port 31 is greater than the first reverse breakdown value, and the third voltage output from the second port 51 is greater than the second reverse breakdown value. The second identification module 62 does not enter the working state, but both the first Zener diode ZD1 and the second Zener diode ZD2 are in the conducting state, and the first capacitor C1 and the second capacitor C2 are charging simultaneously. However, the second preset time is shorter than the first preset time. Therefore, the voltage across the second capacitor C2 reaches 0.7V faster than the voltage across the first capacitor C1. Consequently, the second NPN transistor Q2 enters the conducting state faster than the first NPN transistor Q1. After the second NPN transistor Q2 enters the conducting state first, it pulls down the base voltage of the first NPN transistor Q1, preventing the base voltage of the first NPN transistor Q1 from rising to 0.7V. Therefore, the first NPN transistor Q1 enters the cutoff state.

[0106] This situation occurs when the battery 500 has a voltage type of 24V, the car engine 200 is not running, and the battery 500 is in a discharging state, with the third voltage being 24V.

[0107] 4) When the fourth voltage output from the first port 31 of the control system is greater than the first reverse breakdown value, and the third voltage output from the second port 51 is greater than or equal to the second reverse breakdown value, the second identification module 62 enters the working state. The working principle of the trigger control module 63 is the same as that described in point 3, and will not be repeated here.

[0108] This situation occurs when battery 500 has a voltage type of 24V, and the car engine is started at 200. Battery 500 is either about to enter a charging state or has already entered a charging state. The fourth voltage is a voltage value greater than 28V but less than 29.6V. The third voltage is 24V.

[0109] Please see Figure 8 The battery identification circuit 600 also includes a second reverse connection protection circuit 67. The second reverse connection protection circuit 67 is connected between the second voltage regulator unit 631 and the second port 51. When the battery 500 is reverse connected to the second port 51, it disconnects the current loop between the second switch transistor 633 and the battery 500, so as to avoid the second switch transistor 633 being subjected to excessive current stress, thereby protecting the second switch transistor 633 and preventing the second switch transistor 633 from being damaged by excessive current.

[0110] Please see Figure 9 The second identification module 62 includes a third voltage regulator unit 621 and a second switching unit 622. The third voltage regulator unit 621 is connected to the first port 31 and the control terminal of the second switching unit 622, and the output terminal of the second switching unit 622 is connected to a reference voltage through a first voltage divider unit 64.

[0111] The third voltage regulator unit 621 is used to control the second switching unit 622 to turn on based on a fourth voltage reverse breakdown. The third reverse breakdown value of the third voltage regulator unit 621 is greater than the second reverse breakdown value of the second voltage regulator unit 631. The second switching unit 622 is used to output a third identification voltage when it is turned on. For example, the third reverse breakdown value is 28V.

[0112] Because the fourth voltage is greater than the third reverse breakdown value, the third voltage regulator unit 621 is reversely broken down and enters the conducting state. Under the action of the fourth voltage, the second switching unit 622 meets the conduction condition and enters the conducting state. When the second switching unit 622 enters the conducting state, the second switching unit 622 outputs the third identification voltage.

[0113] Please see Figure 10 The second identification module 62 also includes a third charging unit 623, which is connected to the third voltage regulator unit 621 and the second switching unit 622. The third charging unit 623 is used to charge the third voltage regulator unit 621 for a third preset time when the third voltage regulator unit 621 is turned on.

[0114] Please see Figure 11 The battery identification circuit 600 also includes a third reverse connection protection circuit 68, which is connected between the first port 31 and the third voltage regulator unit 621. When the battery 500 is reverse-connected to the second port 51, the third reverse connection protection circuit 68 disconnects the current loop between the second switch unit 622 and the battery 500, so as to avoid the second switch unit 622 being subjected to excessive current stress, thereby protecting the second switch unit 622 and preventing the second switch unit 622 from being damaged by excessive current.

[0115] Please continue reading. Figure 4 The third voltage regulator unit 621 includes a third Zener diode ZD3 and a fourth resistor R4. The second switching unit 622 includes a third NPN transistor Q3. The third charging unit 623 includes a third capacitor C3 and a fifth resistor R5. The anode of the third Zener diode ZD3 is connected to the first terminal of the fourth resistor R4. The cathode of the third Zener diode ZD3 is used to receive the voltage output from the first port 31. The second terminal of the fourth resistor R4 is connected to the first terminal of the fifth resistor R5, the first terminal of the third capacitor C3, and the base of the third NPN transistor Q3. The second terminal of the fifth resistor R5, the second terminal of the third capacitor C3, and the emitter of the third NPN transistor Q3 are grounded. The collector of the third NPN transistor Q3 receives a reference voltage through the first voltage divider resistor Rf1.

[0116] This application's embodiments are combined with Figure 4 The working principle of the second identification module 62 is explained as follows:

[0117] When the control system is configured to output a first voltage or a second voltage at the first port 31, the first voltage is less than the third reverse breakdown value of the third Zener diode ZD3. Therefore, both the third Zener diode ZD3 and the third NPN transistor Q3 enter the cutoff state.

[0118] When the control system is configured to output a fourth voltage at port 31, this fourth voltage is greater than the third reverse breakdown value of the third Zener diode ZD3. Therefore, the third Zener diode ZD3 enters the conducting state. When the third Zener diode ZD3 enters the conducting state, the third capacitor C3 charges, and simultaneously, the base voltage of the third NPN transistor Q3 increases along with the voltage across the third capacitor C3. When the voltage across the third capacitor C3 exceeds the forward voltage drop of the third NPN transistor Q3 (0.7V), the third NPN transistor Q3 enters the conducting state. When the third NPN transistor Q3 enters the conducting state, it pulls down the voltage at the D+_IN node, resulting in a third identification voltage, which is 0.

[0119] Please see Figure 12 The battery identification circuit 600 also includes a display unit 69, which is connected to a reference voltage and a first voltage divider unit 64. The display unit 69 is used to illuminate when the first identification module 61 outputs a second identification voltage or the second identification module 62 outputs a third identification voltage. Therefore, when the display unit 69 is lit, it indicates that the battery 500 will enter the charging state or has already entered the charging state.

[0120] Please continue reading. Figure 4 The display unit 69 includes an LED lamp k1, the anode of the LED lamp k1 is connected to the second end of the first voltage divider resistor Rf1, and the cathode of the LED lamp k1 is connected to the D+_IN node.

[0121] Please continue reading. Figure 4 The first reverse connection protection circuit 66 includes a first diode D1, the second reverse connection protection circuit 67 includes a second diode D2, and the third reverse connection protection circuit 68 includes a third diode D3. The anode of the first diode D1 is connected to the output terminal of the first voltage regulator unit 611 and the second switching transistor 633, and the cathode of the first diode D1 is connected to the control terminal of the first switching transistor 6122. The anode of the second diode D2 is connected to the second port 51, and the cathode of the second diode D2 is connected to the second voltage regulator unit 631. The anode of the third diode D3 is connected to the first port 31, and the cathode of the third diode D3 is connected to the first voltage regulator unit 611 and the third voltage regulator unit 621.

[0122] Please continue reading. Figure 4The battery identification circuit 600 also includes a first inductor L1 and a fourth capacitor C4. The first end of the first inductor L1 is connected to the first port 31, the second end of the first inductor L1 is connected to the anode of the third diode D3, the first end of the fourth capacitor C4 is connected to the D+_IN node, and the second end of the fourth capacitor C4 is grounded.

[0123] To illustrate in detail the working principle of the battery identification circuit 600 provided in the embodiments of this application, the following embodiments of this application are combined with... Figure 4 The working principle of the battery identification circuit 600 is explained in detail below:

[0124] It is worth noting that in the battery identification circuit 600, the reverse breakdown value of the first Zener diode ZD1 is less than that of the second Zener diode ZD2 and less than that of the third Zener diode ZD3. The reverse breakdown value of the first Zener diode ZD1 is greater than 12V and less than or equal to 13V, the reverse breakdown value of the second Zener diode ZD2 is greater than 13V and less than or equal to 24V, and the reverse breakdown value of the third Zener diode ZD3 is greater than or equal to 28V.

[0125] 1) The battery 500 is 12V and the car engine 200 is not running, so the battery 500 is in a discharging state.

[0126] When a 12V battery 500 is connected to the second port 51 and the car engine 200 is not started, the first voltage configured by the control system to the first port 31 is lower than 13V. The first Zener diode ZD1 is not reverse-biased, and the second Zener diode ZD2 and the third Zener diode ZD3 are not broken down. This ensures that the voltage at the D+_IN node of the battery identification circuit is not affected by the first identification module 61, the second identification module 62, and the trigger control module 63. As a result, the first identification voltage at the D+_IN node is the reference voltage, i.e., the first identification voltage is 3.3V. The first identification voltage of 3.3V represents that the battery at the second port 51 is in a discharging state.

[0127] 2) When the voltage type of battery 500 is 12V and the car engine 200 is started, battery 500 will enter the charging state or has already entered the charging state.

[0128] When the second port 51 is connected to a 12V battery 500 and the car engine is running, the second voltage configured by the control system to the first port 31 is in the range of 13V-14.8V. Therefore, the first Zener diode ZD1 is reverse-biased, while the second Zener diode ZD2 and the third Zener diode ZD3 are not reverse-biased. The second voltage charges the first capacitor C1 through the first resistor R1 and the first diode D1, where the charging time (i.e., the first preset time) is T1 = R1 * C1. When the voltage across the first capacitor C1 is charged to 0.7V, the first NPN transistor Q1 is turned on. Therefore, the first voltage divider resistor Rf1 and the second voltage divider resistor Rf2 form a voltage divider branch through the turned-on first NPN transistor Q1. Thus, the second identification voltage value at the D+_IN node is V1=3.3V / (Rf1+Rf2)*Rf2. The resistance of the LED is very small and negligible. The second identification voltage value indicates that the battery connected to the second port 51 is a 12V battery and the 12V battery is in a charging state.

[0129] 3) The battery 500 is 24V and the car engine 200 is not running, so the battery 500 is in a discharging state.

[0130] When a 24V battery 500 is connected to the second port 51, and the car engine 200 is not running, the voltage (i.e., the fifth voltage) configured by the control system to the first port 31 is less than 24V. Since the fifth voltage at the first port 31 is less than 28V, the third Zener diode ZD3 is not reverse-broken, and the first Zener diode ZD1 is reverse-broken and conducting. Since a 24V battery is connected to the second port 51, the third voltage at the second port 51 is 24V. Therefore, the second Zener diode ZD2 is also reverse-broken. Furthermore, as mentioned above, under the premise that the battery 500 has a 24V voltage type: when the car engine 200 is not running, the voltage output from the first port 31 is lower than 24V. Therefore, the fifth voltage output from the first port 31 is less than 24V, that is, the voltage output from the first port 31 is less than the third reverse breakdown voltage of the third Zener diode ZD3. The third Zener diode ZD3 is not reverse-broken, and the third NPN transistor Q3 is in the off state.

[0131] First, when the second Zener diode ZD2 is turned on, the voltage at the second port 51 charges the second capacitor C2 through the second Zener diode ZD2 and the fourth resistor R4. The charging time (i.e., the second preset time) T2 = R4 * C2. The voltage after the second capacitor C2 is charged can turn on the second NPN transistor Q2. Second, when the first Zener diode ZD1 is turned on, the voltage at the first port 31 charges the first capacitor C1 through the first Zener diode ZD1 and the first resistor R1. The charging time (the first preset time) T1 = R1 * C1. The voltage after the second capacitor C2 is charged can turn on the first NPN transistor Q1. However, since the first preset time T1 is longer than the second preset time T2, the second NPN transistor Q2 enters the conducting state before the first NPN transistor Q1. Once the second NPN transistor Q2 enters the conducting state, it clamps the voltage at the base of the first NPN transistor Q1 to ground, effectively pulling down the voltage at the base of the first NPN transistor Q1, thus keeping it in the off state. Therefore, the voltage at the D+_IN node connected to the first NPN transistor Q1 is not affected by the first identification module 61. At this time, the third identification voltage at the D+_IN node is the reference voltage of 3.3V, and this 3.3V third identification voltage represents that the battery at the second port 51 is in a discharging state.

[0132] 4) When the voltage type of battery 500 is 24V and the car engine 200 is started, battery 500 will enter the charging state or has already entered the charging state.

[0133] When the second port 51 is connected to a 24V type battery 500, and the car engine 200 is started, the fourth voltage configured by the control system to the first port 31 is greater than 28V. Therefore, the first Zener diode ZD1, the second Zener diode ZD2 and the third Zener diode ZD3 are all reverse-biased and broken down.

[0134] As mentioned earlier, when both the first Zener diode ZD1 and the second Zener diode ZD2 are simultaneously broken down, the voltage at the output node D+_IN of the first NPN transistor Q1 will not be affected by the first identification module 61. Since the third Zener diode ZD3 is reverse-biased, the fourth voltage output from the first port 31 charges the third capacitor C3 through the first inductor L1, the third diode D3, the third Zener diode ZD3, and the fourth resistor R4. The charging time (i.e., the third preset time) is T3 = R4 * C3. When the voltage across the third capacitor C3 reaches 0.7V, the third NPN transistor Q3 is turned on, and the voltage at the D+_IN node is pulled low. Therefore, the third identification voltage at the D+_IN node of the third NPN transistor Q3 is 0V. A third identification voltage of 3.3V indicates that the battery at the second port 51 is a 24V battery and that the 24V battery is in a discharging state.

[0135] In summary, the principles by which this application distinguishes the voltage type and operating state of battery 500 are summarized in Table 1:

[0136] Table 1

[0137]

[0138] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them; under the concept of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of this application as described above, which are not provided in detail for the sake of brevity; although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery identification circuit, comprising: The application relates to a battery identification circuit. The first identification module and the second identification module are connected in parallel between a first port and a reference voltage; A trigger control module is connected to the first identification module and a second port for connecting a battery, the voltage type of the battery including a first type and a second type with a working voltage range larger than the first type, and the voltage range of the first port being responsive to the type of the battery and the starting state of a control system for charging the battery; When the voltage type of the battery is the first type, the first identification module is used to enter an off state based on a first voltage output by the first port to output a first identification voltage reflecting that the battery is in a discharging state, and to enter an on state based on a second voltage output by the first port to output a second identification voltage reflecting that the battery will enter a charging state or has entered the charging state, the second voltage being larger than the first voltage; When the voltage type of the battery is the second type, the trigger control module is used to enter an on state based on a third voltage output by the second port to control the first identification module to be off, so that the first identification module outputs the first identification voltage reflecting that the battery is in the discharging state; the second identification module is used to enter an on state based on a fourth voltage output by the first port to output a third identification voltage reflecting that the battery will enter the charging state or has entered the charging state, the first identification voltage being the reference voltage; the third voltage is larger than the second voltage but smaller than the fourth voltage, and the second identification voltage is different from the third identification voltage.

2. The battery identification circuit of claim 1, wherein, The first identification module includes a first voltage stabilizing unit and a first switch unit, the first voltage stabilizing unit being connected to the first port, and the control end and the output end of the first switch unit being connected to the first voltage stabilizing unit and the reference voltage respectively; The first voltage stabilizing unit is used to be off based on the first voltage to control the first switch unit to be off, and is also used to be on based on the second voltage to control the first switch unit to be on; The first switch unit is used to output the first identification voltage when being off and to output a second identification voltage when being on.

3. The battery identification circuit of claim 2, wherein, The first voltage stabilizing unit includes a first voltage stabilizing diode and a first resistor, the anode and the cathode of the first voltage stabilizing diode being connected to the first port and the first end of the first resistor respectively, and the second end of the first resistor being connected to the control end of the first switch unit.

4. The battery identification circuit of claim 2, wherein, The battery identification circuit further includes a first voltage dividing unit and a second voltage dividing unit, and the first switch unit includes a first charging unit and a first switch tube; The first charging unit is connected to the first voltage stabilizing unit and the control end of the first switch tube, the first output end of the first switch tube and the second identification module are both connected to the reference voltage through the first voltage dividing unit, and the second output end of the first switch tube is grounded through the second voltage dividing unit; The first voltage stabilizing unit is used to be on based on the second voltage; The first charging unit is used to charge for a first preset time when the first voltage stabilizing unit is on. The first switch unit is configured to enter a conduction state based on a voltage across the first charging unit after the first charging unit performs a charging operation for the first preset time, so as to turn on a voltage dividing branch between the first voltage dividing unit and the second voltage dividing unit, and a second output terminal of the first switch tube is configured to output the second identification voltage based on a voltage across the second voltage dividing unit generated on the voltage dividing branch.

5. The battery identification circuit of claim 4, wherein, The trigger control module comprises a second voltage stabilizing unit, a second charging unit and a second switch tube. The second charging unit is connected to a control terminal of the second switch tube, an input terminal of the second voltage stabilizing unit is connected to the second port, and an output terminal of the second switch tube is connected to a control terminal of the first switch tube; an output terminal of the second voltage stabilizing unit is connected to a connection between the second charging unit and the second switch tube; a second reverse breakdown value of the second voltage stabilizing unit is greater than a first reverse breakdown value of the first voltage stabilizing unit. The second voltage stabilizing unit is configured to be turned on based on the third voltage, and the second charging unit is configured to perform a charging operation for a second preset time when the second voltage stabilizing unit is turned on, the second preset time being less than the first preset time. The second switch tube is configured to enter a conduction state based on a voltage across the second charging unit after the second charging unit performs a charging operation for the second preset time, so as to control a voltage across the first charging unit to be a low-level signal, the low-level signal being configured to control the first switch tube to be turned off to output the first identification voltage, the third identification voltage being a low-level signal, and the third identification voltage being less than the second identification voltage.

6. The battery identification circuit of claim 5, wherein, The first charging unit comprises a second resistor and a first capacitor, and the second charging unit comprises a third resistor and a second capacitor; a first terminal of the second resistor is connected to a control terminal of the first switch tube, a first terminal of the first capacitor is connected to the control terminal of the first switch tube, and a second terminal of the second resistor and a second terminal of the first capacitor are both grounded; a first terminal of the third resistor is connected to a control terminal of the second switch tube, a first terminal of the second capacitor is connected to the control terminal of the second switch tube, and a second terminal of the third resistor and a second terminal of the second capacitor are both grounded.

7. The battery identification circuit of claim 5, wherein, The second identification module comprises a third voltage stabilizing unit and a second switch unit; the third voltage stabilizing unit is connected to the first port and a control terminal of the second switch unit, and an output terminal of the second switch unit is connected to the reference voltage through the first voltage dividing unit. The third voltage stabilizing unit is configured to be turned on based on the fourth voltage to control the second switch unit to be turned on, and a third reverse breakdown value of the third voltage stabilizing unit is greater than a second reverse breakdown value of the second voltage stabilizing unit. The second switch unit is configured to output the third identification voltage when turned on.

8. The battery identification circuit of claim 7, wherein, The battery identification circuit further comprises a first diode, a second diode and a third diode, an anode of the first diode is connected to the output end of the first voltage stabilizing unit and the second switch tube, a cathode of the first diode is connected to the control end of the first switch tube, an anode of the second diode is connected to the second port, a cathode of the second diode is connected to the second voltage stabilizing unit, an anode of the third diode is connected to the first port, and a cathode of the third diode is connected to the first voltage stabilizing unit and the third voltage stabilizing unit.

9. A battery identification circuit according to any one of claims 4 to 8, characterised in that, The battery identification circuit further comprises a display unit, the display unit is connected to the reference voltage and the first voltage dividing unit; The display unit is used for turning on light when the first identification module outputs the second identification voltage or when the second identification module outputs the third identification voltage.

10. A vehicle apparatus characterized by comprising: Comprise: An automobile engine, The battery identification circuit according to any one of claims 1 to 9, the control system comprises the automobile engine, and the battery identification circuit is used for identifying the type of the battery in the vehicle device and whether to enter a charging state or has entered the charging state.

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