Engineering special vehicle MCU rapid reset control circuit and power management system
By using a fast reset chip in the MCU reset circuit to build a power-off reset submodule, the problem of abnormal MCU reset under frequent ignition start-up and shutdown operations is solved, realizing continuous normal operation and high reliability of the MCU.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-25
- Publication Date
- 2026-03-31
AI Technical Summary
The existing MCU reset circuit has difficulty matching the rapid cyclic power supply pulses during frequent ignition start-up and shutdown operations, resulting in program counter misalignment and failure to function properly.
A power-off reset submodule is constructed using a fast reset chip, and an active chip control scheme is adopted to ensure that the reset signal is quickly identified and a low level is output to the MCU when the voltage drops to a preset threshold, providing sufficient time to complete the complete reset process.
This ensures that the MCU can operate continuously and normally under frequent start-stop scenarios, avoids reset anomalies, and improves the reliability and stability of reset.
Smart Images
Figure CN224067195U_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to the technical field of power management for special vehicles, and in particular to a fast reset control circuit for an MCU and a power management system for engineering special vehicles. Background Technology
[0002] In the field of intelligent control of special vehicles, such as wide-body mining dump trucks, the onboard MCU serves as the core control node, undertaking key tasks such as power system management, sensor data acquisition, and actuator driving. Because special vehicles often operate in high-intensity, high-frequency start-stop scenarios—for example, in open-pit mines with steep slopes—wide-body dump trucks need to maintain braking force through a "pulse start-stop strategy," and their engine systems often need to undergo dozens of ignition and shutdown operations in a short period. This extreme working condition causes severe fluctuations in the vehicle's power supply system.
[0003] However, traditional MCU reset circuit designs mainly rely on RC delay reset or hardware reset mechanisms based on voltage monitoring chips. When the power interruption interval is short, the discharge time constant of the RC reset circuit used in existing technologies is difficult to match the rapidly cycling power supply pulses. This can easily lead to the MCU being powered on again before completing the full reset process, causing program counter misalignment and preventing the MCU from working properly. Utility Model Content
[0004] The purpose of this disclosure is to overcome the shortcomings of the prior art and provide a fast reset control circuit and power management system for MCUs in engineering special vehicles that meet the requirements of frequent ignition start-up and shutdown operations.
[0005] The purpose of this disclosure is achieved through the following technical solution:
[0006] A fast reset control circuit for an engineering special vehicle MCU includes a microcontroller unit and a reset control module. The reset control module includes a power-on reset submodule and a power-off reset submodule. The power-on reset submodule is used to output a reset signal to the chip reset signal terminal of the microcontroller unit when the microcontroller unit is powered on.
[0007] The power-off reset submodule includes a fast reset chip and a voltage divider resistor. The input terminal of the fast reset chip is used to connect to the external power supply terminal, the output terminal of the fast reset chip is connected to the first terminal of the voltage divider resistor, and the second terminal of the voltage divider resistor is connected to the reset signal terminal of the chip.
[0008] In one embodiment, the power failure reset submodule further includes a first filter capacitor, the first end of which is connected to the external power supply terminal, and the second end of which is grounded.
[0009] In one embodiment, the fast reset chip is model SGM809-RXN3L / TR.
[0010] In one embodiment, the power-on reset submodule includes a first current-limiting resistor and a delay capacitor. The first end of the first current-limiting resistor is used to connect to an external power supply terminal. One end of the delay capacitor is connected to the second end of the first current-limiting resistor and the chip reset signal terminal, respectively. The other end of the delay capacitor is grounded.
[0011] In one embodiment, the power-on reset submodule further includes a transient suppression diode, one end of which is connected to an external power supply terminal, and the other end of which is grounded.
[0012] In one embodiment, the power-on reset submodule further includes a manual reset switch, one end of which is connected to the delay capacitor, and the other end of which is grounded.
[0013] In one embodiment, the microcontroller includes a microcontroller and a second current-limiting resistor. The first end of the second current-limiting resistor is connected to the power input terminal of the microcontroller, and the second end of the second current-limiting resistor is grounded. The chip reset signal terminal of the microcontroller is connected to the output terminal of the fast reset chip through a voltage divider resistor.
[0014] In one embodiment, the microcontroller further includes a second filter capacitor, the first end of which is connected to the power input terminal of the microcontroller, and the second end of which is grounded.
[0015] In one embodiment, the microcontroller further includes a third filter capacitor, the first end of which is connected to the power input terminal of the microcontroller, and the second end of which is grounded.
[0016] This application also provides a power management system, including the fast reset control circuit for the MCU of a special engineering vehicle as described in any embodiment.
[0017] Compared with the prior art, this disclosure has at least the following advantages:
[0018] The aforementioned fast reset control circuit for the MCU of special engineering vehicles uses a fast reset chip to construct a power-off reset submodule. It replaces the traditional passive RC network reset mechanism with an active chip control scheme, avoiding MCU reset abnormalities caused by frequent ignition start and shutdown operations. This ensures that the fast reset chip can identify the reset signal and output a low level to the MCU in a short time each time the voltage drops to the preset threshold, giving the MCU enough time to complete the complete reset process and thus ensuring the MCU can work continuously and normally. Attached Figure Description
[0019] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this disclosure and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0020] Figure 1 This is a circuit diagram of a fast reset control circuit for an MCU in an engineering special vehicle, according to one embodiment.
[0021] Figure 2 for Figure 1 The circuit diagram of the reset control module is shown. Detailed Implementation
[0022] To facilitate understanding of this disclosure, a more complete description will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the present disclosure. However, this disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure.
[0023] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.
[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.
[0025] To better understand the technical solutions and beneficial effects of this disclosure, the following detailed description is provided in conjunction with specific embodiments:
[0026] like Figure 1 and Figure 2 As shown, an embodiment of the engineering special vehicle MCU fast reset control circuit 10 of this disclosure includes a microcontroller unit 100 and a reset control module 200. The reset control module 200 includes a power-on reset submodule 210 and a power-off reset submodule 220. The power-on reset submodule 210 is used to output a reset signal to the chip reset signal terminal RESET of the microcontroller unit 100 when the microcontroller unit 100 is powered on.
[0027] The power-off reset submodule 220 includes a fast reset chip U1 and a voltage divider resistor R1. The input terminal of the fast reset chip U1 is used to connect to the external power supply terminal, the output terminal of the fast reset chip U1 is connected to the first terminal of the voltage divider resistor R1, and the second terminal of the voltage divider resistor R1 is connected to the chip reset signal terminal RESET.
[0028] In this embodiment, when a power interruption causes the voltage to drop to a preset threshold of the fast reset chip U1, the fast reset chip U1 can quickly output a low-level signal. This low-level signal is transmitted to the chip reset signal terminal RESET of the microcontroller 100 through the voltage divider resistor R1. Upon receiving the low-level reset signal, the microcontroller 100 immediately initiates its internal reset process. Furthermore, compared to the traditional reset circuit using an RC network, because the fast reset chip U1 can complete the identification and output of the reset signal in a very short time, the microcontroller 100 has sufficient time to complete the complete reset operation, thereby avoiding the problem of the microcontroller 100 failing to fully reset due to a short power interruption interval. When the external power supply resumes normal power supply, the fast reset chip U1 will again sense the voltage change and return to a high-level state at its output terminal. At this time, the signal transmitted to the chip reset signal terminal RESET of the microcontroller 100 through the voltage divider resistor R1 also returns to a high level, and the microcontroller 100 exits the reset state and begins to work according to the preset program.
[0029] The aforementioned engineering special vehicle MCU fast reset control circuit 10 uses a fast reset chip U1 to construct a power-off reset submodule 220, changing the traditional passive RC network reset mechanism to an active chip control scheme. This avoids MCU reset abnormalities caused by frequent ignition start and shutdown operations, ensuring that the fast reset chip U1 can identify the reset signal and output a low level to the MCU in a short time each time the voltage drops to the preset threshold, giving the MCU enough time to complete the complete reset process and thus ensuring the MCU can work continuously and normally.
[0030] like Figure 1 and Figure 2 As shown, in one embodiment, the power-off reset submodule 220 further includes a first filter capacitor C1. The first end of the first filter capacitor C1 is connected to the external power supply terminal, and the second end of the first filter capacitor C1 is grounded. In this embodiment, when the external power supply is normal, the first filter capacitor C1 begins to charge through the external power supply terminal, gradually accumulating charge at its two ends until it reaches a state of equilibrium with the external power supply voltage. At this time, the first filter capacitor C1 acts as an energy storage element, storing a certain amount of electrical energy. During power fluctuations or transient interference, the first filter capacitor C1 can utilize its charging and discharging characteristics to smooth the voltage in the circuit, reducing voltage fluctuations and noise, and providing a relatively stable input voltage for the fast reset chip U1. This allows the fast reset chip U1 to more stably identify the reset signal when the power is interrupted or the voltage drops, thereby improving the reliability of the reset.
[0031] like Figure 1 and Figure 2 As shown, in one embodiment, the fast reset chip U1 is model SGM809-RXN3L / TR. In this embodiment, the SGM809-RXN3L / TR chip continuously monitors the voltage state of the external power supply terminal. When the power supply is normal, the chip is in a high-level output state, indicating that the system voltage is stable and no reset is required. When the power supply is interrupted or the voltage drops to the preset threshold of the SGM809-RXN3L / TR chip, and the duration of the voltage drop exceeds the preset debouncing time inside the chip, the fast reset chip U1 will quickly identify this change and trigger the reset mechanism. After the reset mechanism is triggered, the SGM809-RXN3L / TR chip will immediately output a low-level signal at its output terminal, which is then transmitted to the chip reset signal terminal RESET of the microcontroller unit 100 through the voltage divider resistor R1 as a reset trigger signal. When the external power supply terminal resumes normal power supply, and the voltage stabilizes for a certain period of time, the SGM809-RXN3L / TR chip will sense the voltage change again and return to a high-level state at its output terminal. At this point, upon receiving a high-level signal, the microcontroller unit 100 exits the reset state and begins operating according to the preset program. Specifically, because the SGM809-RXN3L / TR chip has high-precision voltage monitoring capabilities and a fast response speed, it can complete the identification and output of the reset signal in a very short time, ensuring that the microcontroller unit 100 can quickly initiate the reset process when the voltage drops, thereby avoiding the problem of incomplete reset due to too short a power interruption interval.
[0032] like Figure 1 and Figure 2As shown, in one embodiment, the power-on reset submodule 210 includes a first current-limiting resistor R2 and a delay capacitor C2. The first end of the first current-limiting resistor R2 is connected to the external power supply terminal. One end of the delay capacitor C2 is connected to the second end of the first current-limiting resistor R2 and the chip reset signal terminal RESET, while the other end of the delay capacitor C2 is grounded. In this embodiment, when the external power supply starts supplying power, current flows through the first current-limiting resistor R2 to the delay capacitor C2. The main function of the first current-limiting resistor R2 is to limit the current magnitude at the moment of power-on to a safe range, protecting the stability and reliability of the entire circuit. As the current charges the delay capacitor C2 through the first current-limiting resistor R2, the voltage across the delay capacitor C2 gradually increases. In the initial stage of charging, the voltage across the delay capacitor C2 is low, and the chip reset signal terminal RESET receives a low-level signal. After receiving this low-level reset signal, the microcontroller unit 100 immediately initiates the internal reset process. During the charging period of the delay capacitor C2, the microcontroller unit 100 remains in a reset state. Sufficient time is provided for the microcontroller unit 100 to complete its internal initialization. In complex engineering and special vehicle applications, the microcontroller unit 100 may need to perform a series of initialization settings to ensure that it can run various control programs normally. By using a delayed reset, the microcontroller unit 100 is prevented from starting program execution before internal initialization is complete, thereby reducing the possibility of program errors. When the voltage across the delay capacitor C2 reaches the high-level threshold of the microcontroller unit 100's reset signal, the RESET signal at the chip's reset terminal goes high. Upon receiving this high-level signal, the microcontroller unit 100 exits the reset state and begins operating according to the preset program.
[0033] like Figure 1 and Figure 2 As shown, in one embodiment, the power-on reset submodule 210 further includes a transient suppression diode D1. One end of the transient suppression diode D1 is connected to the external power supply terminal, and the other end is grounded. In this embodiment, under normal power supply conditions: when the external power supply is normal, the transient suppression diode D1 is in a reverse bias state, its impedance is very high, and it hardly conducts current. Therefore, under normal operating conditions, the influence of the transient suppression diode D1 on the circuit is negligible. When a transient overvoltage occurs at the external power supply terminal, and the overvoltage exceeds the breakdown voltage of the transient suppression diode D1, the transient suppression diode D1 will immediately conduct, guiding the overvoltage to the ground terminal, thereby protecting the subsequent circuit from damage. When the transient overvoltage event is eliminated and the voltage returns to normal, the transient suppression diode D1 will quickly return to a high impedance state and stop conducting current.
[0034] like Figure 1 and Figure 2 As shown, in one embodiment, the power-on reset submodule 210 further includes a manual reset switch S1. One end of the manual reset switch S1 is connected to the delay capacitor C2, and the other end of the manual reset switch S1 is grounded. In this embodiment, when the microcontroller unit 100 needs to be manually reset, the operator presses the manual reset switch S1. After the manual reset switch S1 is closed, the delay capacitor C2 discharges rapidly to the ground terminal through the switch, causing the voltage across the delay capacitor C2 to drop rapidly. Due to the drop in voltage of the delay capacitor C2, the chip reset signal terminal RESET receives a low-level signal, and the microcontroller unit 100 immediately starts the internal reset process. After the operator releases the manual reset switch S1, the switch returns to the open state, and the delay capacitor C2 is charged again through the first current-limiting resistor R2, and the voltage gradually increases. When the voltage of the delay capacitor C2 reaches the high-level threshold of the microcontroller unit 100 reset signal, the chip reset signal terminal RESET becomes high, the microcontroller unit 100 exits the reset state, and begins normal operation.
[0035] like Figure 1 and Figure 2 As shown, in one embodiment, the microcontroller 100 includes a microcontroller U2 and a second current-limiting resistor R3. The first end of the second current-limiting resistor R3 is connected to the power input terminal of the microcontroller U2, and the second end of the second current-limiting resistor R3 is grounded. The chip reset signal terminal RESET of the microcontroller U2 is connected to the output terminal of the fast reset chip U1 through a voltage divider resistor R1. In this embodiment, the selected microcontroller U2 is an STM32F103RET6, whose chip reset signal terminal RESET is well compatible with the reset circuit components of the fast reset chip U1. When the power supply is interrupted or the voltage drops, the fast reset chip U1 can quickly output a low-level reset signal to the chip reset signal terminal RESET of the STM32F103RET6, ensuring that it can quickly start the internal reset process, thereby avoiding the problem of incomplete reset due to too short a power interruption interval. When the external power supply is normal, current flows to the power input terminal of the microcontroller U2 through the second current-limiting resistor R3. The main function of the second current-limiting resistor R3 is to limit the current flowing to the microcontroller U2, preventing damage to the microcontroller U2 due to excessive current. Especially during power-on instants or voltage fluctuations, the current-limiting resistor provides protection, ensuring the stable operation of the microcontroller U2.
[0036] like Figure 1 and Figure 2As shown, in one embodiment, the microcontroller 100 further includes a second filter capacitor C3. The first terminal of the second filter capacitor C3 is connected to the power input terminal of the microcontroller U2, and the second terminal of the second filter capacitor C3 is grounded. In this embodiment, when the external power supply is normal, current flows through the second current-limiting resistor R3 to the power input terminal of the microcontroller U2, simultaneously charging the second filter capacitor C3. The second filter capacitor C3 gradually accumulates charge, and the voltage across its terminals gradually increases until it reaches equilibrium with the external power supply voltage. At this time, the second filter capacitor C3 acts as an energy storage element, storing a certain amount of electrical energy. When the external power supply experiences a brief voltage drop or interruption, the second filter capacitor C3 begins to discharge, providing temporary power support to the microcontroller U2 through its stored electrical energy. This ensures that the microcontroller U2 can maintain a certain operating state during power fluctuations or interruptions, avoiding resets or malfunctions caused by sudden power changes. When the power supply is normal, the second filter capacitor C3 utilizes its charging and discharging characteristics to smooth the voltage at the power input terminal, reducing voltage fluctuations and noise.
[0037] like Figure 1 and Figure 2 As shown, in one embodiment, the microcontroller 100 further includes a third filter capacitor C4. The first terminal of the third filter capacitor C4 is connected to the power input terminal of the microcontroller U2, and the second terminal of the third filter capacitor C4 is grounded. In this embodiment, when the external power supply is normal, after the current passes through the second current-limiting resistor R3, a portion of the current charges the second filter capacitor C3, and another portion charges the third filter capacitor C4. The two filter capacitors gradually accumulate charge, and the voltage across them gradually increases until they reach equilibrium with the external power supply voltage. At this time, the third filter capacitor C4 also functions as an energy storage element, storing a certain amount of electrical energy, and together with the second filter capacitor C3, provides a stable power environment for the microcontroller U2. When the external power supply experiences a brief voltage drop or interruption, the third filter capacitor C4 and the second filter capacitor C3 simultaneously begin to discharge. They provide temporary power support to the microcontroller U2 through their stored electrical energy, ensuring that the microcontroller U2 can maintain a certain operating state during power fluctuations or interruptions. Meanwhile, the third filter capacitor C4, together with the second filter capacitor C3 and the second current-limiting resistor R3, forms a π-type filter network. When high-frequency noise or voltage fluctuations in the power supply pass through this π-type filter network, the π-type filter network can effectively reduce the impact of power supply sudden changes on the microcontroller U2, smooth the voltage at the power input terminal, reduce voltage fluctuations and noise, and thus reduce the impact of high-frequency noise on the microcontroller U2.
[0038] This application also provides a power management system, including a fast reset control circuit 10 for an engineering special vehicle MCU according to any embodiment. In this embodiment, when a power interruption causes the voltage to drop to a preset threshold of the fast reset chip U1, the fast reset chip U1 can quickly output a low-level signal. This low-level signal is transmitted to the chip reset signal terminal RESET of the microcontroller 100 through the voltage divider resistor R1. After receiving the low-level reset signal, the microcontroller 100 will immediately start the internal reset process. Furthermore, compared with the traditional reset circuit using an RC network, since the fast reset chip U1 can complete the identification and output of the reset signal in a very short time, the microcontroller 100 has enough time to complete the complete reset operation, thereby avoiding the problem that the microcontroller 100 cannot be completely reset due to the short power interruption interval. When the external power supply is restored to normal, the fast reset chip U1 will sense the voltage change again and return to a high-level state at its output terminal. At this time, the signal transmitted to the chip reset signal terminal RESET of the microcontroller 100 through the voltage divider resistor R1 also returns to a high level, and the microcontroller 100 exits the reset state and begins to work according to the preset program.
[0039] Compared with the prior art, this disclosure has at least the following advantages:
[0040] The aforementioned engineering special vehicle MCU fast reset control circuit 10 uses a fast reset chip U1 to construct a power-off reset submodule 220, changing the traditional passive RC network reset mechanism to an active chip control scheme. This avoids MCU reset abnormalities caused by frequent ignition start and shutdown operations, ensuring that the fast reset chip U1 can identify the reset signal and output a low level to the MCU in a short time each time the voltage drops to the preset threshold, giving the MCU enough time to complete the complete reset process and thus ensuring the MCU can work continuously and normally.
[0041] The embodiments described above are merely illustrative of several implementations of this disclosure, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the disclosed patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this disclosure, and these all fall within the protection scope of this disclosure. Therefore, the protection scope of this patent should be determined by the appended claims.
Claims
1. An MCU fast reset control circuit for engineering special vehicle, characterized in that, It includes a microcontroller unit and a reset control module, wherein the reset control module includes a power-on reset submodule and a power-off reset submodule. The power-on reset submodule is used to output a reset signal to the chip reset signal terminal of the microcontroller when the microcontroller is powered on; The power-off reset submodule includes a fast reset chip and a voltage divider resistor. The input terminal of the fast reset chip is used to connect to the external power supply terminal, the output terminal of the fast reset chip is connected to the first terminal of the voltage divider resistor, and the second terminal of the voltage divider resistor is connected to the reset signal terminal of the chip.
2. The engineered specialty vehicle MCU quick reset control circuit of claim 1, wherein, The power failure reset submodule also includes a first filter capacitor, the first end of which is connected to the external power supply terminal, and the second end of which is grounded.
3. The engineered specialty vehicle MCU quick reset control circuit of claim 1, wherein, The fast reset chip is model SGM809-RXN3L / TR.
4. The engineered specialty vehicle MCU quick reset control circuit of claim 1, wherein, The power-on reset submodule includes a first current-limiting resistor and a delay capacitor. The first end of the first current-limiting resistor is used to connect to the external power supply terminal. One end of the delay capacitor is connected to the second end of the first current-limiting resistor and the chip reset signal terminal, respectively. The other end of the delay capacitor is grounded.
5. The engineered specialty vehicle MCU quick reset control circuit of claim 4, wherein, The power-on reset submodule also includes a transient suppression diode, one end of which is connected to the external power supply terminal, and the other end of which is grounded.
6. The engineered specialty vehicle MCU quick reset control circuit of claim 4, wherein, The power-on reset submodule also includes a manual reset switch, one end of which is connected to the delay capacitor and the other end of which is grounded.
7. The engineered specialty vehicle MCU quick reset control circuit of claim 1, wherein, The microcontroller unit includes a microcontroller and a second current-limiting resistor. The first end of the second current-limiting resistor is connected to the power input terminal of the microcontroller, and the second end of the second current-limiting resistor is grounded. The chip reset signal terminal of the microcontroller is connected to the output terminal of the fast reset chip through a voltage divider resistor.
8. The engineered specialty vehicle MCU fast reset control circuit of claim 7, wherein, The microcontroller unit also includes a second filter capacitor, the first end of which is connected to the power input terminal of the microcontroller, and the second end of which is grounded.
9. The engineered specialty vehicle MCU fast reset control circuit of claim 7, wherein, The microcontroller unit also includes a third filter capacitor, the first end of which is connected to the power input terminal of the microcontroller, and the second end of which is grounded.
10. A power management system, characterized by, Includes the engineering special vehicle MCU fast reset control circuit as described in any one of claims 1 to 9.