Vehicle-mounted system safety power-off protection circuit, electronic device and vehicle

Abstract

The application discloses a kind of vehicle-mounted system safety power-down protection circuit, electronic equipment and vehicle.Belong to vehicle technical field.The circuit includes: the first end of voltage division filter circuit is connected with the sampling port of MCU, the second end of voltage division filter circuit is connected with wake-up source circuit, and MCU obtains wake-up source state by voltage division filter circuit;Wake-up source circuit is connected with PMIC wake-up end, for providing wake-up voltage to PMIC;The first end of wake-up control circuit is connected with PMIC wake-up end, the second end of wake-up control circuit is connected with MCU, and MCU is used to control wake-up control circuit and the wake-up voltage of PMIC wake-up end is biased to zero in the power-down process of PMIC.The application is biased to zero by wake-up control circuit in the power-down process of PMIC wake-up end, avoid the interference caused by new wake-up source in power-down process.

Description

Technical Field

[0001] The present invention belongs to the technical field of vehicles, and in particular relates to a vehicle-mounted system safety power-off protection circuit, electronic equipment and a vehicle. Background Art

[0002] To reduce power consumption and extend battery life, vehicle controllers typically have wake-up and sleep functions. When the vehicle is not in use or in standby mode for an extended period, the controller enters sleep mode to reduce power consumption. The controller can be woken up again when needed.

[0003] Common wakeup sources in automobiles include local wakeup, network wakeup, sensor wakeup, and periodic wakeup. The wakeup target is typically a PMIC (Power Management Integrated Circuit) or MCU (Microcontroller Unit). Any wakeup signal can typically wake the system, and it can also be put into sleep mode in the absence of a valid wakeup signal. The process from the PMIC receiving the sleep command from the MCU to fully powering down the system takes approximately 2-3 milliseconds. During the power-down process, new wakeup sources must be prevented from interfering, as this can easily cause system disruption, resulting in improper wakeup and potentially even sleep. Multiple wakeup sources in a vehicle can occur unordered, so for system safety, managing the wakeup signals during the power-down process is crucial. Summary of the Invention

[0004] An object of the present invention is to provide a vehicle-mounted system safe power-off protection circuit, electronic equipment and vehicle, which can solve the technical problem in the prior art of being interfered with by a new wake-up source during the power-off process.

[0005] According to a first aspect of the present invention, a vehicle-mounted system safe power-off protection circuit is provided, comprising:

[0006] The first end of the voltage divider filter circuit is connected to the sampling port of the MCU, and the second end of the voltage divider filter circuit is connected to the wake-up source circuit. The MCU obtains the wake-up source status through the voltage divider filter circuit;

[0007] The wake-up source circuit is connected to the PMIC wake-up terminal and is used to provide a wake-up voltage to the PMIC;

[0008] The first end of the wake-up control circuit is connected to the PMIC wake-up end, and the second end of the wake-up control circuit is connected to the MCU. The MCU is used to control the wake-up control circuit to bias the wake-up voltage of the PMIC wake-up end to zero during the PMIC power-off process.

[0009] Optionally, the wake-up control circuit includes a charging circuit and a wake-up voltage bias circuit;

[0010] A first terminal of the charging circuit is connected to a power supply, a second terminal of the charging circuit is connected to a first capacitor, and a third terminal of the charging circuit is connected to a GPIO interface of an MCU. The MCU is used to control the charging circuit to be turned on or off. When the charging circuit is turned on, the power supply charges the first capacitor through the charging circuit.

[0011] The first capacitor is connected to the wake-up voltage bias circuit, and the first capacitor is used to provide a turn-on voltage to the wake-up voltage bias circuit, so that the wake-up voltage bias circuit biases the wake-up voltage of the PMIC wake-up end to zero when turned on.

[0012] Optionally, the charging circuit includes a first transistor and a second transistor;

[0013] The base of the first transistor is connected to the first end of the first resistor and the first end of the second resistor respectively, the second end of the first resistor is connected to the GPIO interface of the MCU, the second end of the second resistor is grounded, and the emitter of the first transistor is grounded;

[0014] The power supply is connected to the anode of the first diode, the cathode of the first diode is connected to the first end of the third resistor and the first end of the fourth resistor respectively, and the second end of the third resistor is connected to the collector of the first transistor;

[0015] The second end of the fourth resistor is connected to the emitter of the second transistor, the collector of the second transistor is connected to the first end of the first capacitor, the second end of the first capacitor is grounded, and the base of the second transistor is connected to the collector of the first transistor via the fifth resistor.

[0016] Optionally, the wake-up voltage bias circuit includes a third transistor;

[0017] The base of the third transistor is respectively connected to the first end of the sixth resistor and the first end of the seventh resistor, the second end of the sixth resistor is connected to the first end of the first capacitor, the second end of the seventh resistor is grounded, the emitter of the third transistor is grounded, and the collector of the third transistor is connected to the PMIC wake-up end.

[0018] Optionally, the first transistor and the third transistor are NPN transistors, and the second transistor is a PNP transistor.

[0019] Optionally, the voltage divider filter circuit includes an eighth resistor, a ninth resistor and a second capacitor;

[0020] The sampling port of the MCU is respectively connected to the first end of the eighth resistor and the first end of the ninth resistor, the second end of the eighth resistor is connected to the wake-up source circuit, the second end of the ninth resistor is grounded, and the two ends of the second capacitor are respectively connected to the two ends of the ninth resistor.

[0021] Optionally, the wake-up source circuit includes a common cathode dual diode, the two anodes of the common cathode dual diode are respectively connected to the first wake-up source and the second wake-up source, the cathodes of the common cathode dual diode are respectively connected to the second end of the eighth resistor and the first end of the tenth resistor, and the second end of the tenth resistor is connected to the PMIC wake-up end.

[0022] Optionally, a third capacitor and a fourth capacitor are further included;

[0023] The first end of the third capacitor and the first end of the fourth capacitor are connected to the PMIC wake-up end, and the second end of the third capacitor and the second end of the fourth capacitor are grounded.

[0024] According to a second aspect of the present invention, an electronic device is provided, comprising the vehicle-mounted system safe power-off protection circuit according to the first aspect of the present invention.

[0025] According to a third aspect of the present invention, a vehicle is provided, comprising the electronic device according to the second aspect of the present invention.

[0026] The present invention has the following beneficial effects: During power-off, the wake-up control circuit biases the wake-up voltage at the PMIC wake-up terminal to zero, thus preventing interference from new wake-up sources during power-off. During power-on and continuous operation, the wake-up control circuit does not affect the wake-up voltage at the PMIC wake-up terminal, thus preventing normal wake-up. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The present invention is a schematic diagram of a vehicle-mounted system safety power-off protection circuit. DETAILED DESCRIPTION

[0028] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0029] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0030] Techniques, methods, and apparatus known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and apparatus should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0031] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0032] In the present description, references to features referred to as "first" or "second" may explicitly or implicitly include one or more of these features. In the present description, unless otherwise specified, "plurality" means two or more. Furthermore, the term "and / or" in this specification refers to at least one of the connected entities, and the character " / " generally indicates an "or" relationship between the connected entities.

[0033] The present invention introduces a vehicle-mounted system safe power-off protection circuit, which includes a voltage divider filter circuit, a wake-up source circuit and a wake-up control circuit.

[0034] The first end of the voltage divider filter circuit is connected to the sampling port of the MCU, and the second end of the voltage divider filter circuit is connected to the wake-up source circuit. The MCU obtains the wake-up source status through the voltage divider filter circuit.

[0035] The wake-up source circuit is connected to the PMIC wake-up terminal and is used to provide a wake-up voltage to the PMIC.

[0036] The first end of the wake-up control circuit is connected to the PMIC wake-up end, and the second end of the wake-up control circuit is connected to the MCU. The MCU is used to control the wake-up control circuit to bias the wake-up voltage of the PMIC wake-up end to zero during the PMIC power-off process.

[0037] During sleep, the MCU uses a voltage divider and filter circuit to detect the wakeup source status, configures the power-down delay based on system functionality, and sends a sleep command to the PMIC. Upon receiving the sleep command, the PMIC sequentially shuts down the power rails. The power-down process, from receiving the sleep command to shutting down the last rail, typically lasts 2-3ms.

[0038] During power-off, if a new wakeup source appears, it will interfere with the sleep process. In this case, the wakeup control circuit offsets the wakeup voltage at the PMIC wakeup pin to zero to prevent interference from the new wakeup source during power-off. During power-on and continuous operation, the wakeup control circuit does not affect the wakeup voltage at the PMIC wakeup pin, preventing normal wakeup.

[0039] In this embodiment, the wake-up control circuit includes a charging circuit and a wake-up voltage bias circuit.

[0040] A first end of the charging circuit is connected to a power supply, a second end of the charging circuit is connected to a first capacitor, and a third end of the charging circuit is connected to a GPIO interface of an MCU. The MCU is used to control the charging circuit to be turned on or off. When the charging circuit is turned on, the power supply charges the first capacitor through the charging circuit.

[0041] The first capacitor is connected to the wake-up voltage bias circuit, and the first capacitor is used to provide a turn-on voltage to the wake-up voltage bias circuit, so that the wake-up voltage bias circuit biases the wake-up voltage of the PMIC wake-up end to zero when turned on.

[0042] The GPIO interface of the MCU can output a high level or a low level. When the GPIO interface of the MCU outputs a high level, the charging circuit is turned on, and the power supply charges the first capacitor through the charging circuit. When the GPIO interface of the MCU outputs a low level, the charging circuit is turned off, and charging of the first capacitor stops.

[0043] The first capacitor is used to power the voltage bias circuit. When the voltage of the first capacitor is high, the voltage bias circuit is turned on, and the wake-up voltage of the PMIC wake-up terminal is biased to zero through the voltage bias circuit to avoid interference caused by new wake-up sources during power-off. When the voltage of the first capacitor is low, the voltage bias circuit is turned off, and there is no impact on the wake-up voltage of the PMIC wake-up terminal.

[0044] like Figure 1 As shown, in this embodiment, the charging circuit includes a first transistor Q1 and a second transistor Q2.

[0045] The base of the first transistor Q1 is connected to the first end of the first resistor R1 and the first end of the second resistor R2 respectively, the second end of the first resistor R1 is connected to the GPIO interface of the MCU, the second end of the second resistor R2 is grounded, and the emitter of the first transistor Q1 is grounded.

[0046] The power supply is connected to the anode of the first diode D1 , the cathode of the first diode D1 is connected to the first end of the third resistor R3 and the first end of the fourth resistor R4 , and the second end of the third resistor R3 is connected to the collector of the first transistor Q1 .

[0047] The second end of the fourth resistor R4 is connected to the emitter of the second transistor Q2, the collector of the second transistor Q2 is connected to the first end of the first capacitor C1, the second end of the first capacitor C1 is grounded, and the base of the second transistor Q2 is connected to the collector of the first transistor via the fifth resistor R5.

[0048] When the MCU's GPIO interface outputs a high level, the first transistor Q1 and the second transistor Q2 are turned on, and the power supply charges the first capacitor C1 through the fourth resistor R4. When the MCU's GPIO interface outputs a low level, the first transistor Q1 and the second transistor Q2 are turned off, and the first capacitor C1 stops charging.

[0049] like Figure 1 As shown, KL30 is the power supply. KL30 is the normal power supply and is directly connected to the positive terminal of the battery.

[0050] like Figure 1 As shown, in this embodiment, the wake-up voltage bias circuit includes a third transistor Q3.

[0051] The base of the third transistor Q3 is respectively connected to the first end of the sixth resistor R6 and the first end of the seventh resistor R7, the second end of the sixth resistor R6 is connected to the first end of the first capacitor C1, the second end of the seventh resistor R7 is grounded, the emitter of the third transistor Q3 is grounded, and the collector of the third transistor Q3 is connected to the PMIC wake-up end.

[0052] When the voltage of the first capacitor C1 reaches the turn-on voltage of the third transistor Q3, the third transistor Q3 turns on and biases the wake-up voltage of the PMIC wake-up terminal to zero. When the voltage of the first capacitor C1 is lower than the turn-off voltage of the third transistor Q3, the third transistor turns off and does not affect the wake-up voltage of the PMIC wake-up terminal.

[0053] During power-off, the MCU first gives a high-level instruction to the GPIO, turning on the first transistor Q1 and the second transistor Q2, and the power supply charges the first capacitor C1 through the fourth resistor R4. After the voltage of the first capacitor C1 reaches the turn-on voltage of the third transistor Q3, the third transistor Q3 turns on and biases the wake-up voltage of the PMIC wake-up end to zero. The MCU issues a sleep instruction. During this period, the power supply continues to charge the first capacitor C1 through the fourth resistor R4 until the PMIC receives the sleep instruction, and then turns off the voltage supplying the MCU peripherals. At this time, the GPIO returns to a low level, the first transistor Q1 is turned off, the second transistor Q2 is turned off, and the first capacitor C1 stops charging. However, the first capacitor C1 will continue to discharge through the sixth resistor R6 until the voltage of the first capacitor C1 drops below the turn-off voltage of the third transistor Q3.

[0054] The first capacitor C1 is charged only after the MCU issues a high-level command. There is a certain time interval between the MCU issuing a high-level command and the MCU issuing a sleep command. The first capacitor C1 also needs a certain amount of time to be fully charged. By matching the fourth resistor R4 and the first capacitor C1, the charging time of the first capacitor C1 is controlled so that the charging time of the first capacitor C1 is less than the above time interval, ensuring that the first capacitor C1 is fully charged when the sleep command is sent, and ensuring that the third transistor Q3 is turned on when the power-off process begins.

[0055] During the discharge process of the first capacitor C1, it takes a certain amount of time for the voltage of the first capacitor C1 to drop to the cut-off voltage of the third transistor Q3. The entire power-off process also takes a certain amount of time. By matching the first capacitor C1 and the sixth resistor R6, the discharge time of the first capacitor C1 is controlled so that the discharge time of the first capacitor C1 is longer than the power-off process time, ensuring that the third transistor Q3 remains in the on state throughout the power-off process.

[0056] The first transistor Q1 and the third transistor Q3 are NPN transistors, and the second transistor Q2 is a PNP transistor.

[0057] like Figure 1 As shown, in this embodiment, the voltage divider filter circuit includes an eighth resistor R8, a ninth resistor R9 and a second capacitor C2.

[0058] The sampling port of the MCU is respectively connected to the first end of the eighth resistor R8 and the first end of the ninth resistor R9, the second end of the eighth resistor R8 is connected to the wake-up source circuit, the second end of the ninth resistor R9 is grounded, and the two ends of the second capacitor C2 are respectively connected to the two ends of the ninth resistor.

[0059] The eighth resistor R8 and the ninth resistor R9 form a voltage divider circuit to allow the MCU to collect the wake-up source voltage. The second capacitor C2 is a filter capacitor. Figure 1 As shown in FIG, the wake-up source voltage acquisition port is the sampling port of the MCU.

[0060] like Figure 1 As shown, in this embodiment, the wake-up source circuit includes a common cathode dual diode D2, the two anodes of the common cathode dual diode D2 are respectively connected to the first wake-up source and the second wake-up source, the cathodes of the common cathode dual diode are respectively connected to the second end of the eighth resistor and the first end of the tenth resistor, and the second end of the tenth resistor is connected to the PMIC wake-up end.

[0061] like Figure 1As shown in the figure, pins 1 and 2 of the common-cathode dual diode D2 are anode pins, connected to two wake-up sources respectively. Pin 3 of the common-cathode dual diode D2 is the cathode pin and is connected to the PMIC wake-up terminal through resistor R10. The wake-up sources include wake-up source 1 and wake-up source 2. Wake-up source 1 is KL15, a controlled circuit controlled by the ignition switch. Wake-up source 2 is the CAN transceiver output pin INH.

[0062] like Figure 1 As shown, in this embodiment, a third capacitor C3 and a fourth capacitor C4 are further included. The first end of the third capacitor C3 and the first end of the fourth capacitor C4 are connected to the PMIC wake-up terminal, and the second end of the third capacitor C3 and the second end of the fourth capacitor C4 are grounded.

[0063] This embodiment introduces an electronic device, including a vehicle-mounted system safe power-off protection circuit as described in any embodiment of the present invention.

[0064] This embodiment introduces a vehicle, including an electronic device described in an embodiment of the present invention.

[0065] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention.

[0066] Those skilled in the art will appreciate that the modules and algorithm steps described in conjunction with the embodiments disclosed herein can be implemented using electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present invention.

[0067] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described devices and equipment can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0068] In the embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the modules is merely a logical function division. In actual implementation, there may be other division methods, such as multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or modules, which can be electrical, mechanical or other forms.

[0069] The modules described as separate components may or may not be physically separate, and the components shown as modules may or may not be physical modules, that is, they may be located in one place or distributed across multiple network modules. Some or all of these modules may be selected according to actual needs to achieve the objectives of the embodiments of the present invention.

[0070] In addition, each functional module in the embodiment of the present invention may be integrated into one processing module, or each module may exist physically separately, or two or more modules may be integrated into one module.

[0071] If the functions are implemented in the form of software modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the portion that contributes to the prior art, or the portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of various embodiments of the present invention. The aforementioned storage medium includes various media that can store program code, such as USB flash drives, mobile hard drives, ROM, RAM, magnetic disks, or optical disks.

[0072] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of the invention herein is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the inventive concept. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features having similar functions disclosed in this application.

[0073] It should be understood that the size of the serial numbers of the steps in the content of the invention and the embodiments of the present invention does not absolutely mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention. The foregoing description of the implementation of the present disclosure has been given for the purpose of example and description. The foregoing description is not exhaustive and is not intended to limit the present disclosure to the exact form disclosed. Various variations and modifications may exist based on the above teachings, or various variations and modifications may be obtained from the practice of the present disclosure. These embodiments are selected and described in order to illustrate the principles of the present disclosure and its practical application, so that those skilled in the art can utilize the present disclosure in various embodiments and various modifications suitable for the specific purpose conceived.

Claims

1. A vehicle system safety power-off protection circuit, characterized in that: include: The first end of the voltage divider filter circuit is connected to the sampling port of the MCU, and the second end of the voltage divider filter circuit is connected to the wake-up source circuit. The MCU obtains the wake-up source status through the voltage divider filter circuit; The wake-up source circuit is connected to the PMIC wake-up terminal and is used to provide a wake-up voltage to the PMIC; A first end of the wake-up control circuit is connected to the PMIC wake-up end, and a second end of the wake-up control circuit is connected to the MCU. The MCU is used to control the wake-up control circuit to bias the wake-up voltage of the PMIC wake-up end to zero during the PMIC power-off process; The wake-up control circuit includes a charging circuit and a wake-up voltage bias circuit; A first terminal of the charging circuit is connected to a power supply, a second terminal of the charging circuit is connected to a first capacitor, and a third terminal of the charging circuit is connected to a GPIO interface of an MCU. The MCU is used to control the charging circuit to be turned on or off. When the charging circuit is turned on, the power supply charges the first capacitor through the charging circuit. The first capacitor is connected to the wake-up voltage bias circuit, and the first capacitor is used to provide a turn-on voltage to the wake-up voltage bias circuit, so that the wake-up voltage bias circuit biases the wake-up voltage of the PMIC wake-up terminal to zero when turned on; The charging circuit includes a first transistor and a second transistor; The base of the first transistor is connected to the first end of the first resistor and the first end of the second resistor respectively, the second end of the first resistor is connected to the GPIO interface of the MCU, the second end of the second resistor is grounded, and the emitter of the first transistor is grounded; The power supply is connected to the anode of the first diode, the cathode of the first diode is connected to the first end of the third resistor and the first end of the fourth resistor respectively, and the second end of the third resistor is connected to the collector of the first transistor; The second end of the fourth resistor is connected to the emitter of the second transistor, the collector of the second transistor is connected to the first end of the first capacitor, the second end of the first capacitor is grounded, and the base of the second transistor is connected to the collector of the first transistor via a fifth resistor; The wake-up voltage bias circuit includes a third transistor; The base of the third transistor is respectively connected to the first end of the sixth resistor and the first end of the seventh resistor, the second end of the sixth resistor is connected to the first end of the first capacitor, the second end of the seventh resistor is grounded, the emitter of the third transistor is grounded, and the collector of the third transistor is connected to the PMIC wake-up end.

2. The vehicle-mounted system safe power-off protection circuit according to claim 1, characterized in that: The first transistor and the third transistor are NPN transistors, and the second transistor is a PNP transistor.

3. The vehicle-mounted system safety power-off protection circuit according to claim 1, characterized in that: The voltage divider filter circuit includes an eighth resistor, a ninth resistor and a second capacitor; The sampling port of the MCU is respectively connected to the first end of the eighth resistor and the first end of the ninth resistor, the second end of the eighth resistor is connected to the wake-up source circuit, the second end of the ninth resistor is grounded, and the two ends of the second capacitor are respectively connected to the two ends of the ninth resistor.

4. The vehicle-mounted system safe power-off protection circuit according to claim 3, characterized in that: The wake-up source circuit includes a common cathode dual diode, the two anodes of the common cathode dual diode are respectively connected to the first wake-up source and the second wake-up source, the cathodes of the common cathode dual diode are respectively connected to the second end of the eighth resistor and the first end of the tenth resistor, and the second end of the tenth resistor is connected to the PMIC wake-up end.

5. The vehicle-mounted system safe power-off protection circuit according to claim 1, characterized in that: Also including a third capacitor and a fourth capacitor; The first end of the third capacitor and the first end of the fourth capacitor are connected to the PMIC wake-up end, and the second end of the third capacitor and the second end of the fourth capacitor are grounded.

6. An electronic device, characterized in that: The invention comprises a vehicle-mounted system safe power-off protection circuit as described in any one of claims 1 to 5.

7. A vehicle, characterized in that: An electronic device comprising the electronic device described in claim 6.

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