Collision detection signal transmission circuit and intelligent mobile device

Abstract

This application discloses a collision detection signal transmission circuit and a smart mobile device, relating to the field of circuit protection technology. The collision detection signal transmission circuit includes: a collision detection module for detecting collision events and generating corresponding level signals upon power-up; a power switch module connected to the collision detection module for supplying power to the collision detection module; a level management module connected to the collision detection module for providing a reference level and changing the reference level upon receiving a level signal; and a control module connected to both the power switch module and the level management module for outputting an enable signal to control the power switch module to supply power to the collision detection module, and also for monitoring the level status of the reference level. This application achieves electrical isolation and standardized level management between the collision signal and the main control MCU, ensuring the safety of the main control MCU (which acts as the control module) and improving the reliability of the system in responding to collision events and the flexibility of the response strategy.

Description

Technical Field

[0001] This application relates to the field of circuit protection technology, and in particular to a collision detection signal transmission circuit and a smart mobile device. Background Technology

[0002] In practical applications of self-moving devices such as snowplows and lawnmowers, collision detection is a key technology for ensuring safe operation. These devices typically use physical collision strips installed around their perimeter, combined with a main control MCU (Micro Controller Unit) to sense and respond to unexpected collisions. Current mainstream collision detection mechanisms mostly use mechanical sensors or electronic switches as trigger sources. Once a collision occurs, the collision strip will experience mechanical displacement or a change in electrical signal, which will then send an interrupt signal or a level change signal to the main control MCU, enabling the device to promptly execute safety strategies such as obstacle avoidance or shutdown.

[0003] However, in most existing circuit designs, collision signals are often directly connected to the I / O pins of the main control MCU. While this connection method is simple and straightforward, it poses significant safety hazards in real-world working environments. Self-moving devices frequently operate under complex and variable conditions. For example, snow-sweeping robots may operate in high humidity, low temperature, and snow-covered environments, while lawnmowers are exposed to the outdoors for extended periods, making them susceptible to moisture, dust, and electrical interference. These environmental factors can easily cause static electricity buildup or power grid surges, which can introduce high-voltage pulses or instantaneous large currents through the collision detection circuit, leading to I / O pin breakdown of the main control MCU, chip damage, or even permanent system failure. Utility Model Content

[0004] The main purpose of this application is to propose a collision detection signal transmission circuit and an intelligent mobile device, which aims to solve the problem that the main control device in current self-moving devices is easily damaged after a collision with the collision strip.

[0005] To achieve the above objectives, this application proposes a collision detection signal transmission circuit, which includes:

[0006] A collision detection module is used to detect collision events after being powered on and generate a corresponding level signal for the collision event.

[0007] A power switch module, which is connected to the collision detection module, is used to supply power to the collision detection module;

[0008] A level management module, connected to the collision detection module, is used to provide a reference level and change the reference level after receiving the level signal;

[0009] The control module is connected to both the power switch module and the level management module. It is used to output an enable signal to control the power switch module to supply power to the collision detection module, and also to monitor the level status of the reference level.

[0010] In one embodiment, the collision detection module includes:

[0011] A collision bar, which is used to detect a collision event after being powered on and generate a corresponding level signal for the collision event;

[0012] A connector, which is connected to the collision strip, is used to forward the level signal to the level management module.

[0013] In one embodiment, the level management module includes:

[0014] A first resistor, the first end of which is connected to the connector, and the second end of which is connected to a reference power supply.

[0015] In one embodiment, the collision detection signal transmission circuit further includes a transmission protection module, the transmission protection module comprising:

[0016] A first transient voltage suppression diode, the first terminal of which is connected to the connector and the control module respectively, and the second terminal of which is grounded;

[0017] The capacitor has its first end connected to both the connector and the control module, and its second end grounded.

[0018] In one embodiment, the level management module includes at least two first resistors, the level signal includes at least two level split signals, and the transmission protection module includes at least two identical transmission protection units, wherein an independent transmission channel is formed by one first resistor and one transmission protection unit, and one independent transmission channel transmits one level split signal to the control module.

[0019] In one embodiment, the collision detection signal transmission circuit further includes a pull-down module, the pull-down module comprising:

[0020] The second resistor has its first end connected to the power switch module and used to receive the enable signal from the control module, and its second end grounded.

[0021] In one embodiment, the collision detection signal transmission circuit further includes a current limiting module, the current limiting module comprising:

[0022] A third resistor, the first end of which is connected to the power switch module, and the second end of which is connected to both the power switch module and ground.

[0023] In one embodiment, the power switch module is configured with a fault pin, which is connected to the control module. The fault pin is used to output a fault signal to the control module when the load current of the power switch module exceeds the current threshold corresponding to the third resistor, so as to adjust the enable signal sent by the control module.

[0024] In one embodiment, the collision detection signal transmission circuit further includes:

[0025] A power supply protection module, one end of which is connected to the power switch module and the collision detection module respectively, and the other end of which is grounded.

[0026] In one embodiment, the power supply protection module includes a second transient voltage suppression diode.

[0027] This application also proposes an intelligent mobile device, which includes the above-mentioned collision detection signal transmission circuit. When the control module in the collision detection signal transmission circuit detects a change in the level of the reference level, it executes a preset collision response task.

[0028] This application employs an integrated solution comprising a collision detection module, a power switch module, a level management module, and a control module. The power switch module supplies power to the collision detection module based on the enable signal from the control module. The collision detection module generates a level signal corresponding to a collision event. The level management module transmits the level signal by changing the reference level state. The control module simultaneously manages the power supply and monitors the reference level state. This avoids the problems of traditional designs where collision signals are directly connected to the I / O pins of the main control MCU, leading to pin damage due to the lack of intermediate conditioning and isolation circuits. It also avoids the stability risks arising from the coupling of power supply and signal detection functions. This achieves electrical isolation and standardized level management between the collision signal and the main control MCU, ensuring the safety of the main control MCU (which acts as the control module) and improving the system's reliability and response strategy flexibility in handling collision events through modular design. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the structure of an embodiment of the collision detection signal transmission circuit of this application;

[0031] Figure 2 This is a schematic diagram of the collision detection module in the collision detection signal transmission circuit of this application;

[0032] Figure 3 This is a schematic diagram of the level management module in the collision detection signal transmission circuit of this application;

[0033] Figure 4 This is a schematic diagram of the transmission protection module in the collision detection signal transmission circuit of this application;

[0034] Figure 5 This is a schematic diagram of the transmission protection unit in the collision detection signal transmission circuit of this application;

[0035] Figure 6 This is a schematic diagram of the circuit structure of the pull-down module in the collision detection signal transmission circuit of this application;

[0036] Figure 7 This is a schematic diagram of the circuit structure of the current limiting module in the collision detection signal transmission circuit of this application;

[0037] Figure 8 This is a schematic diagram of the power supply protection module in the collision detection signal transmission circuit of this application.

[0038] Figure 9 This is a schematic diagram of the overall circuit structure of the collision detection signal transmission circuit of this application.

[0039] Explanation of icon numbers:

[0040] 10 Collision detection module 20 Power switch module 30 Level Management Module 40 Control module 50 Transmission protection module 50 dropdown module 60 Rate limiting module 70 Power protection module 11 Collision bar 12 connector 51 Transmission protection unit C1~C2 capacitance R1~R4 resistance D1~D2 Transient voltage suppression diode GND land VDD Reference power supply

[0041] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0042] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0043] It should be noted that if the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0044] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0045] In most existing circuit designs, collision signals are often directly connected to the I / O pins of the main control MCU. While this connection method is simple and straightforward, it poses significant safety hazards in real-world working environments. Self-moving devices frequently operate under complex and variable conditions. For example, snow-sweeping robots may operate in high humidity, low temperature, and snow-covered environments, while lawnmowers are exposed to the outdoors for extended periods, making them susceptible to moisture, dust, and electrical interference. These environmental factors can easily cause static electricity buildup or power grid surges, which can introduce high-voltage pulses or instantaneous large currents through the collision detection circuit, leading to I / O pin breakdown of the main control MCU, chip damage, or even permanent system failure.

[0046] Based on this, this application provides a collision detection signal transmission circuit, which includes: a collision detection module, which detects a collision event after being powered on and generates a corresponding level signal for the collision event; a power switch module, which is connected to the collision detection module and supplies power to the collision detection module; a level management module, which is connected to the collision detection module and provides a reference level, and changes the reference level after receiving a level signal; and a control module, which is connected to both the power switch module and the level management module, and outputs an enable signal to control the power switch module to supply power to the collision detection module, and also monitors the level status of the reference level.

[0047] This application employs an integrated solution comprising a collision detection module, a power switch module, a level management module, and a control module. The power switch module supplies power to the collision detection module based on the enable signal from the control module. The collision detection module generates a level signal corresponding to a collision event. The level management module transmits the level signal by changing the reference level state. The control module simultaneously manages the power supply and monitors the reference level state. This avoids the problems of traditional designs where collision signals are directly connected to the I / O pins of the main control MCU, leading to pin damage due to the lack of intermediate conditioning and isolation circuits. It also avoids the stability risks arising from the coupling of power supply and signal detection functions. This achieves electrical isolation and standardized level management between the collision signal and the main control MCU, ensuring the safety of the main control MCU (which acts as the control module) and improving the system's reliability and response strategy flexibility in handling collision events through modular design.

[0048] This application proposes a collision detection signal transmission circuit, referring to... Figure 1 , Figure 1 This is a schematic diagram of a collision detection signal transmission circuit according to an embodiment of this application. In this embodiment, the collision detection signal transmission circuit includes:

[0049] The collision detection module 10 is used to detect collision events after power is applied and generate a corresponding level signal for the collision event.

[0050] Power switch module 20 is connected to collision detection module 10 and is used to supply power to collision detection module 10.

[0051] The level management module 30 is connected to the collision detection module 10 and is used to provide a reference level and change the reference level after receiving a level signal.

[0052] The control module 40 is connected to the power switch module 20 and the level management module 30 respectively. It is used to output an enable signal to control the power switch module 20 to supply power to the collision detection module 10, and also to monitor the level status of the reference level.

[0053] It should be noted that the power switch module 20 refers to a power management function module controlled by the control module 40. This module turns on or off the power supply circuit to the collision detection module 10 according to the enable signal (such as high / low level) issued by the control module 40. One end of the power switch module 20 receives the control signal, i.e., the enable signal, from the control module 40, while the other end provides operating power to the collision detection module 10, realizing intelligent switching control of the power supply to the collision detection module 10. This not only reduces the system's standby power consumption, but more importantly, it can actively cut off the power supply when the equipment malfunctions, avoiding the risk of the system power supply being impacted by abnormal situations such as short circuits in the collision detection circuit.

[0054] Understandably, in existing collision detection circuits, collision signals are directly connected to the main control MCU's I / O pins. Under complex operating conditions, these circuits are highly susceptible to damage from high-voltage pulses or instantaneous high currents caused by static electricity or surges. Therefore, this embodiment employs an integrated solution comprising a collision detection module 10, a power switch module 20, a level management module 30, and a control module 40. The power switch module 20 supplies power to the collision detection module 10 based on the enable signal from the control module 40. The collision detection module 10 generates a level signal corresponding to a collision event. The level management module 30 transmits the level signal by changing the reference level state. The control module 40 simultaneously manages the power supply and monitors the reference level state. This avoids the problems of pins being susceptible to damage from high-voltage surges and static interference due to the lack of intermediate conditioning and isolation circuits when collision signals are directly connected to the main control MCU's I / O pins in traditional designs, as well as the stability risks caused by the coupling of power supply and signal detection functions. It achieves electrical isolation and standardized level management between the collision signal and the main control MCU, ensuring the safety of the main control MCU (which serves as the control module 40) and improving the reliability of the system in responding to collision events and the flexibility of the response strategy through modular design.

[0055] Additionally, it should be noted that you should refer to [the relevant documentation / reference]. Figure 2 The collision detection module 10 includes:

[0056] Collision bar 11 is used to detect collision events after power is applied and generate a corresponding level signal for the collision event.

[0057] Connector 12, which is connected to collision bar 11, is used to forward the level signal to level management module 30.

[0058] The collision strip 11 is a physical structure installed on the periphery of the self-moving device. Its function is to generate mechanical displacement or electrical signal change when the device is accidentally collided, thereby triggering the generation of a level signal representing the occurrence of the collision event, such as a high level or a low level. This physical structure usually integrates mechanical sensors or electronic switching elements and is the trigger source for collision detection.

[0059] As an example, please refer to Figure 3 The level management module 30 includes:

[0060] The first resistor R1 has its first end connected to connector 12, and its second end connected to the reference power supply VDD.

[0061] It is understandable that connector 12 is connected to the first end of the first resistor R1. When the collision bar does not generate a level signal, the reference power supply VDD can provide a high level to the control module 40 through the first resistor. When the collision bar generates a level signal corresponding to the collision event, the level signal can be a low level, thereby pulling the level of the first resistor R1 at the first end low, so that the control module can detect the low level at the level management module 30 to identify the occurrence of the collision.

[0062] In one feasible implementation, please refer to Figure 4 The collision detection signal transmission circuit also includes a transmission protection module, which includes:

[0063] The first transient voltage suppression diode D1 has its first terminal connected to connector 10 and control module 40 respectively, and its second terminal grounded to GND.

[0064] Capacitor C1, the first end of capacitor C1 is connected to connector 12 and control module 40 respectively, and the second end of capacitor C1 is grounded to GND.

[0065] It should be noted that the transmission protection module 50 is a circuit functional module located between the collision detection module 10 and the control module 40. The core function of this module is to protect the signal path during the transmission of the level signal generated by the collision detection module 10 to the control module 40. This module can suppress or absorb interference such as static electricity, surge high voltage, or instantaneous large current that may be introduced from the connector end through internal circuit components such as diodes and capacitors, ensuring that the electrical signals transmitted to the I / O pins of the control module 40 are safe and reliable, thereby preventing the control module 40, as the main control device, from being damaged by overvoltage or overcurrent.

[0066] Understandably, the transmission protection module 50, composed of the first transient voltage suppression diode D1 (i.e., TVS) and capacitor C1, uses the first TVS diode D1 to quickly clamp the transmission line voltage to a safe ground potential to absorb high-energy surge pulses, while capacitor C1 filters high-frequency noise. Together, they avoid the risk of high-voltage pulses or instantaneous large currents directly accessing the I / O pins of the control module 40, causing it to break down and be damaged. This achieves efficient and fast transient suppression and noise filtering of the signal transmission path, thereby significantly improving the circuit's anti-interference capability and the safety of the main control device.

[0067] It is understandable that ordinary diodes (such as ordinary switching diodes or rectifier diodes) have insufficient response speed and surge absorption capacity, making it difficult to effectively cope with the severe instantaneous overvoltages that mobile devices may encounter in harsh outdoor environments, such as lightning-induced surges or high-voltage spikes generated by the disconnection of inductive loads from motors. By utilizing the nanosecond-level response speed and extremely high surge absorption capacity of transient voltage suppression diodes, abnormal high-voltage pulses appearing on the transmission line of connector 12 can be clamped to a safe voltage value and conducted to ground. This avoids the risk that high-voltage pulses may still penetrate the protection circuit and damage the I / O pins of the control module 40 due to the slow response or insufficient power capacity of ordinary diodes. It achieves precise and robust suppression of high-speed, high-energy transient interference, greatly enhancing the safety of the control module 40.

[0068] For example, the first transient voltage suppression diode D1 is a bidirectional TVS diode, with its first and second terminals (which have no anode / cathode distinction due to their bidirectional symmetry) directly connected to the signal pin of connector 12 and the system's reference power supply VDD, respectively. The minimum clamping voltage of this bidirectional TVS diode is set to be much higher than the normal logic level of the signal line, but much lower than the maximum withstand voltage of the I / O pins of the main control MCU, i.e., control module 40. This ensures that when an abnormal high-voltage transient pulse, whether positive or negative, appears on the connector signal line, the TVS diode can act rapidly at nanosecond speeds, clamping the voltage bidirectionally below a safe value and dissipating the surge energy to ground, thereby achieving comprehensive overvoltage protection for the input pins of the main control MCU.

[0069] In one feasible implementation, please refer to Figure 5 The level management module 30 includes at least two first resistors R1, the level signal includes at least two level split signals, and the transmission protection module 50 includes at least two identical transmission protection units 51. An independent transmission channel is formed by one first resistor R1 and one transmission protection unit 51, and one independent transmission channel transmits one level split signal to the control module 40.

[0070] It should be noted that the transmission protection unit 51 is an independent and fully functional circuit submodule, and its structure and function are equivalent to the transmission protection module 50. That is, each transmission protection unit 51 can include the circuit composed of the first transient voltage suppression diode D1 and capacitor C1, for example... Figure 5The system contains two transmission protection units 51. One transmission protection unit 51 consists of a first transient voltage suppression diode D1 and a capacitor C1, while the other transmission protection unit 51 consists of a third transient voltage suppression diode D3 and a capacitor C2. One resistor is the first resistor R1, and the other resistor is called the fourth resistor R4 (which has the same function as the first resistor R1). Each transmission protection unit 51 is independently responsible for receiving a single-level split signal from connector 12 and independently providing filtering, current limiting, and transient voltage suppression protection during the transmission of this split signal to control module 40.

[0071] It is understandable that there may be multiple collision strips 11 or multiple sensors in one collision strip 11 in a smart mobile device. For example, in the collision strip of a snow sweeping robot, there are corresponding collision sensors on the left and right sides of the collision strip. Both of these collision sensors can detect the collision time after being powered on and generate a level signal corresponding to the collision time. The level signal generated by any one of the collision sensors is called a level split signal. This level split signal can be independently transmitted to the control module 40 through an independent transmission channel to support the control module 40 in independently identifying the specific collision position of the snow sweeping robot based on the level split signal, and then executing a preset collision response task based on the specific collision position.

[0072] In one feasible implementation, please refer to Figure 6 The collision detection signal transmission circuit also includes a pull-down module 60, which includes:

[0073] The second resistor R2 has its first end connected to the power switch module 20 and used to receive the enable signal from the control module 40. The second end of the second resistor R2 is grounded to GND.

[0074] It should be noted that the pull-down module 60 is a specific circuit structure composed of the second resistor R2. The first end of the second resistor R2 is connected to the control signal input terminal of the power switch module 20, that is, the pin used to receive the enable signal from the control module, and the second end is directly grounded to GND. Its function is to provide a fixed low-level path to ground GND for the enable signal of the control module 40.

[0075] Understandably, since the enable signal sent from the control module 40 to the power switch module 20 may float due to environmental electromagnetic interference when it is in a high impedance state or at an undefined level, the power switch module 20 may malfunction, thereby posing a risk of incorrect power supply to the collision detection module 10. Therefore, in this embodiment, a pull-down module 60 is formed by the second resistor R2. The first end of the second resistor R2 is connected to the enable signal line, and the second end is grounded. This provides a defined low-level path, avoiding noise interference to the enable signal line due to floating, which could lead to instability in the state of the power switch module 20 and possible accidental conduction. This achieves reliable clamping of the enable signal, ensuring that the power switch module 20 only operates when it receives a clear and valid enable signal from the control module 40, thereby improving the stability and anti-interference capability of the entire power supply control logic.

[0076] In one feasible implementation, please refer to Figure 7 The collision detection signal transmission circuit also includes a current limiting module 70, which includes:

[0077] The third resistor R3 has its first end connected to the power switch module 20, and its second end connected to both the power switch module 20 and ground GND.

[0078] It should be noted that the current limiting module 70 is a specific circuit functional unit composed of a third resistor R3. The first end of the third resistor R3 is connected to the current detection point of the power switch module 20, which is usually the source of the internal power transistor or a dedicated current sensing pin, while the second end is directly grounded to GND. Thus, a precise current threshold can be set by the resistance value of the third resistor R3. When the load current provided by the power switch module 20 to the collision detection module 10 flows through this resistor, a voltage drop signal proportional to the current magnitude will be generated across its two ends. This signal is fed back to the internal comparison circuit of the power switch module 20, thereby limiting the output current within a preset safe range and preventing excessive current from being generated due to short circuit or overload of the collision detection module 10 circuit.

[0079] Understandably, during the process of powering the collision detection module 10, the power switch module 20 faces the risk of excessive load current due to internal short circuits in the collision strip 10, damaged circuit insulation, or humid environments. Excessive current can damage the power switch module 20 itself and even endanger the stability of the system's main power supply. Therefore, a current limiting module 70 composed of a third resistor R3 is adopted. The first end of the third resistor R3 is connected to the current sensing point of the power switch module 20, and the second end is grounded to GND. By setting a precise current threshold through the resistance value of the third resistor R3, the output current of the power switch module 20 is limited to a safe range. This avoids the risk of overheating damage to the power switch module 20, PCB trace burnout, or system power failure caused by instantaneous large currents generated by accidental overcurrent or short circuits on the load side. It achieves active overcurrent protection for the power supply circuit and improves the robustness and safety of the circuit.

[0080] In another feasible implementation, the power switch module 20 is configured with a fault pin, which is connected to the control module 40. The fault pin is used to output a fault signal to the control module 40 when the load current of the power switch module 20 exceeds the current threshold corresponding to the third resistor R3, so as to adjust the enable signal sent by the control module 40.

[0081] It should be noted that the fault pin is a dedicated, open-drain or open-collector output digital signal pin on the chip of the power switch module 20. This pin is configured to be directly connected to a general-purpose input pin of the control module 40. This fault pin serves as the module's internal status monitoring output. When the overcurrent detection circuit built into the power switch module 20 determines that its load current, i.e., the current flowing to the collision bar, exceeds the safety threshold set by the external third resistor R3, this pin will change from high to low, actively sending a low-active fault signal to the control module 40, thereby informing the control module 40 that an abnormal overcurrent or short-circuit event has occurred in the power supply circuit.

[0082] For example, the current threshold I corresponding to the third resistor R3 LIMIt It can be determined by the following formula:

[0083]

[0084] Where K is an empirical constant, which can be set to 13260, and R... ILIM This is the resistance value of the third resistor, R3.

[0085] The power switch module 20 uses an intelligent high-side switch chip with integrated fault reporting function. Its fault pin is directly connected to a general-purpose input pin of the main control MCU. The third resistor R3 is a precision sampling resistor. Its first end is connected to the current limiting setting pin of the intelligent high-side switch chip, and its second end is grounded. When the load current flowing to the collision bar is too large, causing the voltage drop across the sampling resistor, i.e., the third resistor R3, to exceed the threshold of the chip's internal comparator, i.e., the aforementioned current threshold I, the power switch module 20 uses an intelligent high-side switch chip with integrated fault reporting function. LIMIT When the fault pin of its open-drain output is actively pulled to a low level by the chip, a low-active fault interrupt signal is sent to the main control MCU. The main control MCU can then cut off the enable signal to shut down the power supply path from the intelligent high-side switch chip to the collision bar 10.

[0086] In one feasible implementation, please refer to Figure 8 The collision detection signal transmission circuit also includes:

[0087] The power supply protection module 80 has one end connected to the power switch module 20 and the collision detection module 10, and the other end of the power supply protection module 80 is grounded to GND.

[0088] It should be noted that the power supply protection module 80 is a circuit function module set between the output terminal of the power switch module 20 and the collision detection module 10. One end of it is connected to the output node of the power switch module 20 that provides the working voltage to the collision strip 11 and the power supply pin of the connector 12 in the collision detection module 10. The other end is grounded to GND to monitor and protect the power supply line, prevent high voltage surges or transient overvoltage impacts introduced from the connector end or the collision strip side of the collision detection module 10 due to environmental factors from being conducted to the output terminal of the power switch module 20, thereby avoiding over-stress damage to the power switch module 20 due to output overvoltage, and ensuring that the power supply voltage provided to the collision detection module 10 is stable and reliable.

[0089] As an example, the power supply protection module 80 includes a second transient voltage suppression diode D2.

[0090] Since the power supply protection module 80 requires a specific circuit element that can quickly respond to and efficiently absorb high-energy transient overvoltages to cope with the extreme and instantaneous high-voltage surge impacts in harsh outdoor environments, this example uses a second transient voltage suppression diode D2 to implement the function of the power supply protection module 80. The first end of the diode is connected to the output terminal of the power switch module 20 and the connector 12 in the collision detection module 10, and the second end is directly grounded to GND. By utilizing the nanosecond-level extremely fast response speed and the surge absorption capacity of the transient voltage suppression diode, it can quickly clamp the high-voltage spikes appearing on the power supply line to a safe predetermined voltage value and discharge them to ground. This avoids the risk that the high-voltage pulse may partially penetrate and still damage the internal precision output circuit of the power switch module 20, which may be caused by the slow response speed or inaccurate clamping voltage of ordinary overvoltage protection components such as varistors. This achieves accurate, fast and highly reliable suppression of transient overvoltages in the power supply line, thereby reliably protecting the output stage of the power switch module 20.

[0091] For example, the power supply protection module 80 uses a bidirectional second transient voltage suppressor diode D2. Its first end (cathode or anode, which need not be distinguished due to its bidirectional nature) is directly connected to the junction point of the power output pin of the power switch module 20 and the power input pin of the connector 12 in the collision detection module 10, and the second end is directly connected to the system main reference ground (GND). The breakdown voltage of this TVS diode D2 is much higher than the normal operating voltage of the collision strip, but lower than the maximum withstand voltage of the power switch module 20. This ensures that when a transient high voltage surge exceeding the breakdown voltage is introduced on the power supply line due to motor interference or static electricity, the TVS diode can act immediately to clamp the voltage within a safe range and discharge excess energy to the ground, effectively protecting the output stage of the power switch module 20 from overvoltage stress damage.

[0092] For example, in order to combine the structure and circuit of each embodiment in the above embodiments, please refer to Figure 9 . Figure 9 The neutron diagram (A) includes a circuit structure centered on the power switch module 20, and also includes the second resistor R2 in the pull-down module 60 connected to the power switch module 20 and the third resistor R3 in the current limiting module 70. Here, EN_5V_CLSN represents the enable signal of the control module 40; CLSN_5V represents the collision bar power supply signal, used to power the collision bar; the IN pin is used to connect to a 5V input power supply; EN1 and EN2 pins are two channels that can be enabled and controlled; FAULT1 and FAULT2 pins are both fault pins, which can be used to output fault signals; the ILIM pin is the current limiting setting pin corresponding to the current limiting module 70; OUT1 and OUT2 are pins for two output channels; and the EPAD pin is a thermal pad grounded, used for heat dissipation and electrical connection.

[0093] Figure 9 Neutron diagram (B) includes a circuit structure centered on connector 12 in collision detection module 10, and also includes two transmission protection units 51 connected to connector 2 and a second transient voltage suppression diode D2 in power supply protection module 80. EXTI_CLSN_IO1 and EXTI_CLSN_IO2 represent two I / O pins of control module 40.

[0094] This application also proposes an intelligent mobile device, which includes a collision detection signal transmission circuit. When the control module in the collision detection signal transmission circuit detects a change in the level of the reference level, it executes a preset collision response task. The specific structure of the collision detection signal transmission circuit is as described in the above embodiments. Since this intelligent mobile device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated here.

[0095] The above are merely exemplary embodiments of this application and do not limit the patent scope of this application. Any equivalent structural transformations made based on the technical concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A collision detection signal transmission circuit, characterized by, The collision detection signal transmission circuit includes: A collision detection module is used to detect collision events after being powered on and generate a corresponding level signal for the collision event. A power switch module, which is connected to the collision detection module, is used to supply power to the collision detection module; A level management module, connected to the collision detection module, is used to provide a reference level and change the reference level after receiving the level signal; The control module is connected to both the power switch module and the level management module. It is used to output an enable signal to control the power switch module to supply power to the collision detection module, and also to monitor the level status of the reference level.

2. The crash detection signal transmission circuit according to claim 1, wherein, The collision detection module includes: A collision bar, which is used to detect a collision event after being powered on and generate a corresponding level signal for the collision event; A connector, which is connected to the collision strip, is used to forward the level signal to the level management module.

3. The crash detection signal transmission circuit of claim 2, wherein, The level management module includes: A first resistor, the first end of which is connected to the connector, and the second end of which is connected to a reference power supply.

4. The crash detection signal transmission circuit according to claim 3, wherein The collision detection signal transmission circuit further includes a transmission protection module, which includes: A first transient voltage suppression diode, the first terminal of which is connected to the connector and the control module respectively, and the second terminal of which is grounded; The capacitor has its first end connected to both the connector and the control module, and its second end grounded.

5. The crash detection signal transmission circuit according to claim 4, wherein The level management module includes at least two first resistors, the level signal includes at least two level split signals, and the transmission protection module includes at least two identical transmission protection units. An independent transmission channel is formed by one first resistor and one transmission protection unit, and one independent transmission channel transmits one level split signal to the control module.

6. The crash detection signal transmission circuit of claim 1, wherein, The collision detection signal transmission circuit further includes a pull-down module, which includes: The second resistor has its first end connected to the power switch module and used to receive the enable signal from the control module, and its second end grounded.

7. The crash detection signal transmission circuit of claim 1, wherein, The collision detection signal transmission circuit further includes a current limiting module, which includes: A third resistor, the first end of which is connected to the power switch module, and the second end of which is connected to both the power switch module and ground.

8. The crash detection signal transmission circuit of claim 7, wherein, The power switch module is equipped with a fault pin, which is connected to the control module. The fault pin is used to output a fault signal to the control module when the load current of the power switch module exceeds the current threshold corresponding to the third resistor, so as to adjust the enable signal sent by the control module.

9. The collision detection signal transmission circuit as described in claim 1, characterized in that, The collision detection signal transmission circuit further includes: A power supply protection module, one end of which is connected to the power switch module and the collision detection module respectively, and the other end of which is grounded; The power supply protection module includes a second transient voltage suppression diode.

10. A smart mobile device, characterized by The smart mobile device includes a collision detection signal transmission circuit as described in any one of claims 1 to 9, wherein the control module in the collision detection signal transmission circuit executes a preset collision response task when it detects a change in the level state of the reference level.

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