Circuit device for enhancing anti-interference capability of controller

Abstract

The utility model discloses a circuit device for enhancing the anti-interference capability of a controller, and belongs to the field of vehicle controllers. The device comprises a vehicle end wake-up source, a voltage division circuit, an SBC power management module and a controller, wherein the vehicle end wake-up source is connected with the input end of the voltage division circuit; the output end of the voltage division circuit is connected with the input end of the SBC power supply management module; and the output end of the SBC power management module is connected with the enabling end of the controller. According to the utility model, wake-up source interference caused by transient voltage and the like is effectively isolated, a reliable and effective wake-up / sleep state of the controller is ensured, and the anti-interference capability of the controller is improved.

Description

Technical Field

[0001] This utility model belongs to the field of vehicle controllers. Specifically, this utility model relates to a circuit device for enhancing the anti-interference capability of the controller. Background Technology

[0002] With the increasing popularity of new energy vehicles, the usage rate of controllers in vehicles is gradually increasing, which also places higher demands on the power supply immunity of the controllers themselves and the cost of the entire assembly. The wake-up / sleep state of the controller plays an important role in the efficient and reliable operation of the vehicle system.

[0003] The patent document with publication number CN210363462U, publication date 2020-04-21, and titled "A High-Reliability Battery Management System Multi-Input Wake-up Control Circuit" discloses a high-reliability battery management system multi-input wake-up control circuit, comprising a wake-up module, a power supply module, and a microcontroller. The wake-up module is electrically connected to different types of wake-up sources, and is electrically connected to both the power supply module and the microcontroller. After receiving a wake-up signal from a wake-up source, the wake-up module transmits an enable signal to the power supply module. The power supply module outputs power to the microcontroller, and the wake-up module transmits a wake-up signal to the microcontroller. The microcontroller outputs a sleep signal to the power supply module. The wake-up sources include a vehicle wake-up source, a fast-charging wake-up source, a slow-charging wake-up source, and a CAN network wake-up source. The wake-up module includes three hard-wired wake-up channels and one CAN network wake-up channel.

[0004] However, controllers often fail to self-discharge their own capacitors, resulting in a transient voltage of around 2V in the vehicle's power system when the vehicle is off. Since current controllers utilize power management MOSFETs with voltages around 1.4V due to cost-saving measures, this leads to the controller being intermittently woken up in the off state until the capacitor discharges completely. This phenomenon affects the controller's sleep / wake-up mechanism and is a problem that urgently needs to be addressed. Utility Model Content

[0005] This invention aims to overcome the shortcomings of the prior art and proposes a circuit device to enhance the anti-interference capability of the controller, so as to achieve the following objectives: effectively isolate wake-up source interference such as transient voltage, ensure reliable and effective controller wake-up / sleep state, and improve the controller's anti-interference capability.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a circuit device for enhancing the anti-interference capability of a controller, the device comprising a vehicle-side wake-up source, a voltage divider circuit, an SBC power management module, and a controller, wherein: the vehicle-side wake-up source is connected to the input terminal of the voltage divider circuit; the output terminal of the voltage divider circuit is connected to the input terminal of the SBC power management module; and the output terminal of the SBC power management module is connected to the enable terminal of the controller.

[0007] Preferably, the voltage divider circuit includes a first voltage divider resistor and a second voltage divider resistor, wherein: the vehicle-end wake-up source, the first voltage divider resistor, and the second voltage divider resistor are connected in series and then grounded; the terminal led out between the series-connected first voltage divider resistor and the second voltage divider resistor serves as the output terminal of the voltage divider circuit and is connected to the input terminal of the SBC power management module.

[0008] Preferably, the SBC power management module includes a MOSFET and an SBC power management chip. The control terminal of the MOSFET is connected to the output terminal of the voltage divider circuit. The first terminal of the MOSFET is connected to the power supply VDD through a pull-up resistor, and its lead-out terminal is connected to the enable terminal of the SBC power management chip through a current-limiting resistor. The second terminal of the MOSFET is grounded. The output terminal of the SBC power management chip is connected to the enable terminal of the controller.

[0009] Preferably, a diode is connected in series between the vehicle-side wake-up source and the first voltage divider resistor, with the negative terminal of the diode connected to the vehicle-side wake-up source and the positive terminal of the diode connected to the first voltage divider resistor.

[0010] Preferably, the device further includes a wake-up source detection module, which is connected to the wake-up source and the controller respectively, and is used to detect the wake-up source by monitoring the output voltage of the wake-up source.

[0011] Preferably, the controller includes a microcontroller (MCU).

[0012] The technical effect of this utility model is as follows: In response to unstable wake-up sources such as transient voltage of the vehicle power supply, this utility model uses a voltage divider resistor circuit to perform voltage division processing, so that the voltage after voltage division is within the wake-up voltage range of the MOS in the SBC power management module, avoiding the SBC power management module being mistakenly enabled and thus causing the controller to wake up falsely. This utility model improves the anti-interference capability of the controller. Attached Figure Description

[0013] Figure 1 This is a circuit diagram illustrating an embodiment of the present invention to enhance the anti-interference capability of a controller. Detailed Implementation

[0014] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. The purpose is to help those skilled in the art to have a more complete, accurate, and in-depth understanding of the inventive concept and technical solution of this utility model, and to facilitate its implementation. It should be noted that the terms "first," "second," etc., used in this application are only for the convenience of describing the technical solution and distinguishing different components, and are not intended to limit this application. To make the technical solution of this utility model clearer, it will be explained and illustrated through the following embodiments.

[0015] like Figure 1 As shown, this embodiment provides a circuit device to enhance the anti-interference capability of a controller. The device includes a vehicle-side wake-up source, a voltage divider circuit, an SBC power management module, and a controller, wherein: the vehicle-side wake-up source is connected to the input terminal of the voltage divider circuit; the output terminal of the voltage divider circuit is connected to the input terminal of the SBC power management module; and the output terminal of the SBC power management module is connected to the enable terminal of the controller.

[0016] In this embodiment, the controller is a microcontroller (MCU), which is widely used in the vehicle field. It has the advantages of high integration, small size and strong processing power, which can improve the working efficiency of the entire vehicle system.

[0017] In practical applications, there are usually multiple vehicle-side wake-up sources, including the vehicle-side power key and other wake-up sources. Among them, the vehicle-side wake-up sources may generate transient voltages during operation, causing the controller to be falsely woken up. Taking the vehicle-side power supply as an example, if the vehicle-side power supply does not perform self-discharge treatment on its own capacitor components, a transient voltage of about 2V will exist in the power system when the whole vehicle is OFF. This will cause the low-cost MOS in the SBC power management module to be falsely turned on, thereby causing the controller to be falsely woken up and endangering the controller's safety.

[0018] To address the aforementioned issues, this embodiment employs a voltage divider circuit for voltage division, ensuring that the divided voltage falls within the wake-up voltage range of the MOS transistors in the SBC power management module. Specifically, the voltage divider circuit in this embodiment includes a first voltage divider resistor (R2 or R3) and a second voltage divider resistor (R1), wherein: the vehicle-side wake-up source, the first voltage divider resistor, and the second voltage divider resistor are connected in series and then grounded; that is, the vehicle-side power supply KEY is connected in series with resistors R2 and R1 and then grounded; other wake-up sources (WAKE) are connected in series with resistors R3 and R1 and then grounded. The terminal leading out from the series-connected first and second voltage divider resistors serves as the output terminal of the voltage divider circuit and is connected to the input terminal of the SBC power management module.

[0019] The SBC power management module in this embodiment includes a MOSFET and an SBC power management chip. The control terminal of the MOSFET is connected to the output terminal of the voltage divider circuit. The first terminal of the MOSFET is connected to the power supply VDD through a pull-up resistor, and its lead-out terminal is connected to the enable terminal of the SBC power management chip through a current-limiting resistor. The second terminal of the MOSFET is grounded. The output terminal of the SBC power management chip is connected to the enable terminal of the controller. In this embodiment, an NMOS transistor is used, with the corresponding control terminal being the gate, the first terminal being the drain, and the second terminal being the source.

[0020] Based on the voltage divider circuit and SBC power management module described above, the formula for calculating the gate voltage of the MOSFET is: U0=U1*R1 / (R1+Rx);

[0021] Where U1 represents the output voltage of the wake-up source, and Rx represents resistor R2 or R3. In this embodiment, taking the vehicle-side power supply KEY as an example, U1 represents the output voltage of the vehicle-side power supply KEY, R1 = 4.7kΩ, Rx = R2 = 10kΩ, and the conduction voltage of the MOSFET is 1.4V. Calculated using the above formula, U1 = (R1 + Rx) * U0 / R1 = (4.7 + 10) * 1.4 / 4.7 = 4.3V.

[0022] Therefore, the MOSFET only conducts when the output voltage U1 of the vehicle-side power supply KEY is greater than 4.3V, enabling the SBC power management chip and allowing it to properly wake up the controller. At this time, for a normally functioning vehicle-side power supply KEY, its output voltage is between 9V and 16V, ensuring normal controller wake-up. For transient voltages generated by the vehicle-side power supply KEY, typically around 2V, the MOSFET is obviously not turned on, preventing the controller from being mistakenly turned on. In practical implementation, the resistance value of the voltage divider resistor can be flexibly configured according to the different MOSFET turn-on voltages to ensure the controller is not mistakenly turned on, improving the controller's anti-interference capability.

[0023] To ensure the safety of each wake-up source, this embodiment also connects a diode in series between the vehicle-side wake-up source and the first voltage divider resistor. The negative terminal of the diode is connected to the vehicle-side wake-up source, and the positive terminal of the diode is connected to the first voltage divider resistor, thus preventing the output voltage from reversing and damaging the wake-up source.

[0024] In a preferred embodiment of this application, the device further includes a wake-up source detection module, which is connected to both the wake-up source and the controller. After the controller is woken up, it can detect the wake-up source by monitoring the output voltage of the wake-up source through the wake-up source detection module.

[0025] This application achieves effective isolation when unstable interference such as transient voltage emitted by the wake-up source is achieved based on voltage divider, ensuring a reliable and effective wake-up / sleep state for the controller and improving the controller's anti-interference capability.

[0026] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A circuit device for enhancing the anti-interference capability of a controller, characterized in that: The device includes a vehicle-side wake-up source, a voltage divider circuit, an SBC power management module, and a controller, wherein: the vehicle-side wake-up source is connected to the input terminal of the voltage divider circuit; the output terminal of the voltage divider circuit is connected to the input terminal of the SBC power management module; and the output terminal of the SBC power management module is connected to the enable terminal of the controller.

2. The circuit device for enhancing the anti-interference capability of a controller according to claim 1, characterized in that: The voltage divider circuit includes a first voltage divider resistor and a second voltage divider resistor, wherein: the vehicle-end wake-up source, the first voltage divider resistor, and the second voltage divider resistor are connected in series and then grounded; the terminal led out between the series-connected first voltage divider resistor and the second voltage divider resistor serves as the output terminal of the voltage divider circuit and is connected to the input terminal of the SBC power management module.

3. The circuit device for enhancing the anti-interference capability of a controller according to claim 1, characterized in that: The SBC power management module includes a MOSFET and an SBC power management chip. The control terminal of the MOSFET is connected to the output terminal of the voltage divider circuit. The first terminal of the MOSFET is connected to the power supply VDD through a pull-up resistor, and its lead-out terminal is connected to the enable terminal of the SBC power management chip through a current-limiting resistor. The second terminal of the MOSFET is grounded. The output terminal of the SBC power management chip is connected to the enable terminal of the controller.

4. The circuit device for enhancing the anti-interference capability of a controller according to claim 2, characterized in that: A diode is connected in series between the vehicle-side wake-up source and the first voltage divider resistor. The negative terminal of the diode is connected to the vehicle-side wake-up source, and the positive terminal of the diode is connected to the first voltage divider resistor.

5. A circuit device for enhancing the anti-interference capability of a controller according to any one of claims 1-4, characterized in that: The device also includes a wake-up source detection module, which is connected to the wake-up source and the controller respectively, and is used to detect the wake-up source by monitoring the output voltage of the wake-up source.

6. A circuit device for enhancing the anti-interference capability of a controller according to any one of claims 1-4, characterized in that: The controller includes a microcontroller (MCU).

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