CN214311386U - Monitoring reset circuit of serial bus, on-vehicle system and vehicle - Google Patents
Monitoring reset circuit of serial bus, on-vehicle system and vehicle Download PDFInfo
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- CN214311386U CN214311386U CN202120611461.8U CN202120611461U CN214311386U CN 214311386 U CN214311386 U CN 214311386U CN 202120611461 U CN202120611461 U CN 202120611461U CN 214311386 U CN214311386 U CN 214311386U
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Abstract
The present disclosure relates to a monitoring reset circuit of a serial bus, a vehicle-mounted system and a vehicle, the monitoring reset circuit of the serial bus comprises: the device comprises a serial bus, a control module, a constant current source module, a first diagnosis module, a second diagnosis module and a reset module; the serial bus is connected between the control equipment and the terminal; the control module, the constant current source module and the first diagnosis module are sequentially connected in series and connected to the serial bus; the second diagnostic module and the reset module are connected in parallel and are connected to the serial bus. According to the technical scheme provided by the embodiment of the disclosure, detection of an open circuit, a short circuit and a normal working state can be completed through the synergistic effect of the modules, and the terminal can be reset under the condition of terminal failure, so that monitoring of the connection state of the serial bus is facilitated, and various exceptions of no response or problem response of the terminal are improved.
Description
Technical Field
The disclosure relates to the technical field of vehicles, in particular to a monitoring reset circuit of a serial bus, a vehicle-mounted system and a vehicle.
Background
With the development of the automobile industry, the proportion of video transmission in a vehicle-mounted information entertainment system of an intelligent automobile is heavier, and a video serial bus has wide application in scenes such as camera signal transmission, liquid crystal display video signal transmission, image signal interconnection and the like based on the advantages of high bandwidth, low cost, light weight and the like.
In the traditional application, a video serial bus is used for transmitting video data and control instructions, and once a chip of a terminal breaks down (for example, crashes), a control end cannot control the terminal; in addition, the control of the traditional scheme is communicated through a digital serial bus protocol, once the bus fails, the protocol cannot carry out terminal control, so that an unrecoverable signal transmission failure is caused, a display failure occurs on a screen of a light person, a camera image failure may be caused by a heavy person, so that auxiliary driving is caused, and an automatic driving function is failed.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem or at least partially solve the technical problem, the present disclosure provides a monitoring reset circuit of a serial bus, an on-vehicle system, and a vehicle.
The present disclosure provides a monitoring reset circuit of a serial bus, the monitoring reset circuit including: the device comprises a serial bus, a control module, a constant current source module, a first diagnosis module, a second diagnosis module and a reset module;
the serial bus is connected between the control equipment and the terminal; the control module, the constant current source module and the first diagnosis module are all arranged in the control equipment, and the second diagnosis module and the reset module are arranged in the terminal; the control module is a module which responds to a control signal of the control device to control whether the constant current source module outputs current, the constant current source module is a module which responds to the control of the control module to output a constant current control signal, the first diagnosis module and the second diagnosis module are modules which cooperatively detect the connection state of the serial bus and the abnormal state of the terminal, and the reset module is a module which resets the terminal;
the control module, the constant current source module and the first diagnosis module are sequentially connected in series and connected to the serial bus; the second diagnostic module and the reset module are connected in parallel and are connected to the serial bus.
In some embodiments, the control module includes a first terminal, a second terminal and a third terminal, the first terminal of the control module is a port for receiving an input signal, the second terminal of the control module is a port for receiving a control signal, and the third terminal of the control module is connected to the constant current source module.
In some embodiments, the monitor reset circuit further comprises a protection module; the protection module is used for performing voltage reduction protection on a diagnosis signal, and the diagnosis signal is generated in response to the connection state of the serial bus or the abnormal state of the terminal;
the protection module is arranged in the control equipment and is connected with the serial bus.
In some embodiments, the control module comprises a first control switch, a second control switch, a first resistor, a second resistor, a third resistor, and a diode;
the first resistor is connected in series between the control end of the first control switch and the control signal end, the second resistor is connected in series between the control end of the first control switch and the ground, the third resistor and the first control switch are sequentially connected in series between the control end of the second control switch and the ground, and the diode and the second control switch are sequentially connected in series between the input signal end and the first end of the constant current source module.
In some embodiments, the constant current source module comprises a constant current source reference, a third control switch, a fourth resistor, a fifth resistor, a sixth resistor, and a first capacitor;
the third control switch is a drive switch based on the constant current source, the fourth resistor is a current-limiting resistor based on the constant current source, the sixth resistor is a set resistor based on the constant current source, and the fifth resistor and the first capacitor are sequentially connected in series between the control end of the third control switch and the ground.
In some embodiments, the first diagnostic module includes a seventh resistance and the second diagnostic module includes a ninth resistance;
the seventh resistor is connected in series between the constant current source module and the serial bus;
the ninth resistor is connected in series between the serial bus and the ground, and the serial bus is also connected with the terminal through a capacitor.
In some embodiments, the protection module comprises an eighth resistor and a zener diode;
the eighth resistor is connected in series between the serial bus and the diagnostic signal terminal;
the Zener diode is connected in series between the diagnostic signal terminal and ground.
In some embodiments, the reset module comprises a tenth resistor and a second capacitor;
the tenth resistor is connected in series between the serial bus and the reset signal end;
the second capacitor is connected in series between the reset signal end and the ground.
The present disclosure also provides a vehicle-mounted system, including any one of the above monitoring reset circuits of the serial bus.
The present disclosure also provides a vehicle including any one of the above-described serial bus monitoring reset circuits, or including any one of the above-described onboard systems.
Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:
the monitoring reset circuit of the serial bus provided by the embodiment of the disclosure comprises the serial bus, a control module, a constant current source module, a first diagnosis module, a second diagnosis module and a reset module; the serial bus is connected between the control equipment and the terminal; the control module is a module for responding to a control signal of the control equipment to control whether the constant current source outputs current or not, the constant current source module is a module for responding to the control of the control module to output a constant current control signal, the first diagnosis module and the second diagnosis module are modules for cooperatively detecting the connection state of the serial bus and the abnormal state of the terminal, and the reset module is a module for resetting the terminal; the control module, the constant current source module and the first diagnosis module are all arranged in the control equipment and are sequentially connected in series and connected to the serial bus; the second diagnostic module and the reset module are connected in parallel and are connected to the serial bus. Therefore, through the synergistic effect of the modules, the corresponding diagnosis signals can be respectively detected when the serial bus between the control equipment and the terminal is in an open circuit, a short circuit and a normal working state, so that the detection of various connection states is realized, the terminal can be reset under the condition of terminal failure, and the improvement of various exceptions that the terminal has no response or has problems in response is facilitated.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a monitoring reset circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of another monitoring reset circuit provided in the embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of another monitoring reset circuit provided in the embodiment of the present disclosure.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.
The embodiment of the disclosure provides a high-speed video serial bus monitoring reset circuit based on a current source, which is not limited to vehicle-mounted system application, and can be applied to other related serial bus video transmission systems, the high-speed video serial bus monitoring reset circuit can reset a terminal under the condition of not influencing the transmission of high-speed video signals of the bus, can complete the monitoring of a normal connection state, an open circuit state and a short circuit state between a control device and the terminal, has high reliability, good safety and low cost, and can be suitable for various coaxial transmission scenes of the serial bus.
Illustratively, the Serial bus applicable to the monitor reset circuit provided by the embodiments of the present disclosure may include a Gigabit Multimedia Serial Link (GMSL), a TI video Serial bus (such as FPD-Link), and other Serial buses that coaxially transmit video data and control instructions known to those skilled in the art, which are not limited herein.
When the device is applied to a vehicle, the control device can comprise a vehicle machine, a vehicle-mounted controller or other devices capable of sending control instructions; the monitoring reset circuit can determine the connection state of the serial bus and the abnormal state of the terminal based on the detected diagnosis signal, so that the terminal is reset when the connection is abnormal or the terminal is abnormal, and the monitoring reset circuit has the advantages of high reliability, good safety, simple circuit structure and low cost.
The monitoring reset circuit for the serial bus provided by the embodiment of the present disclosure is exemplarily described below with reference to fig. 1 to 3.
In some embodiments, fig. 1 illustrates a monitoring reset circuit for a serial bus according to an embodiment of the present disclosure. Referring to fig. 1, the monitoring reset circuit may include: a serial bus 100, a control module 110, a constant current source module 120, a first diagnostic module 130, a second diagnostic module 140, and a reset module 160; the serial bus 100 is connected between the control device 101 and the terminal 102; the control module 110, the constant current source module 120 and the first diagnosis module 130 are all arranged in the control device 101, and the second diagnosis module 140 and the reset module 160 are arranged in the terminal 102; the control module 110 is a module for controlling whether the constant current source 120 outputs current in response to a control signal of the control device 101, the constant current source module 120 is a module for outputting a constant current control signal in response to the control of the control module 110, the first diagnostic module 130 and the second diagnostic module 140 are modules for cooperatively detecting a connection state of the serial bus and an abnormal state of the terminal, and the reset module 150 is a module for resetting the terminal; the control module 110, the constant current source module 120 and the first diagnosis module 130 are sequentially connected in series and connected to the serial bus 100; the second diagnostic module 140, the reset module 160, and the terminal 102 are all connected in parallel and to the serial bus 100.
The constant current source module 120 outputs a current control signal under the control of the control module 110, and the current control signal is transmitted from the control device 101 to the terminal 102 via the serial bus 100. The magnitude of the current control signal is not affected by the length of the serial bus 100, and the anti-interference capability is strong, so that the monitoring reset circuit provided by the embodiment of the disclosure can be applied to various serial buses 100 with different lengths, i.e., the application range is wide.
Illustratively, the length of the serial bus 100 may be 1m, 10m, 15m, or other lengths, which are not limited herein.
The reset module 160, the first diagnostic module 130 and the second diagnostic module 140 cooperate to detect the connection state of the serial bus 100 between the control device 101 and the terminal 102, and output corresponding diagnostic signals and reset signals corresponding to different states, thereby implementing detection of normal, open, and short circuit states.
Meanwhile, the reset control can be performed on the terminal 102 under the condition that the terminal 102 fails, so that the method is safe, stable and reliable, and the problem that the terminal 102 fails to be halted and cannot be reset can be solved.
The monitoring reset circuit of the embodiment of the present disclosure adopts the constant current source module 120, can utilize the characteristics of the current source, has strong anti-interference capability, is not affected by the length of the transmission line, transmits the reset signal to the terminal 102 without affecting the high-speed signal transmission of the bus, can complete the monitoring of open circuit, short circuit and normal working state at the same time, has low cost and reliability, and can be suitable for various coaxial transmission scenes of the serial bus 100; meanwhile, the monitoring reset circuit can accurately output a reset signal to reset the terminal 102 under the condition that the terminal 102 fails or completely fails, is safe, stable and reliable, and solves various difficult problems that the serial bus 100 does not have response.
In some embodiments, fig. 2 illustrates another monitoring reset circuit for a serial bus provided by embodiments of the present disclosure. Referring to fig. 2, the monitoring reset circuit may further include a protection module 150, and the protection module 150 is a module for performing a step-down protection on a diagnostic signal generated in response to a connection state of the serial bus or an abnormal state of the terminal.
The signal transmitted by the serial bus 100 is usually a high-voltage signal, and the protection module 150 is arranged to clamp the high-voltage signal at a low voltage so as to avoid damage of the signal on the serial bus 100 to a circuit related to logic control of the control device 101.
Meanwhile, the diagnostic signal protection is implemented by the protection module 150, thereby ensuring that an accurate diagnostic signal is detected.
In some embodiments, with continued reference to fig. 2, the control module 110 includes a first terminal, a second terminal and a third terminal, the first terminal of the control module 110 is a port for receiving an input signal and is connected to the input signal terminal VCC, the second terminal of the control module 110 is a port for receiving a control signal and is connected to the control signal terminal VKZ, the third terminal of the control module 110 is connected to the first terminal of the constant current source module 120, the second terminal of the constant current source module 120 is connected to the first terminal of the first diagnostic module 130, the first terminal of the protection module 150 is connected to the diagnostic signal terminal VZD, and the second terminal of the protection module 150 and the second terminal of the first diagnostic module 130 are both connected to one end of the serial bus 100; the other end of the serial bus 100 is connected to one end of the second diagnostic module 140, the terminal 102 and one end of the reset module 160, the other end of the second diagnostic module 140 is grounded, and the other end of the reset module 160 is connected to the reset signal terminal VFW.
The input signal end VCC can be connected with a power supply signal, and the power supply signal can be 9-16V in an automobile application scene; the control signal terminal VKZ can receive a control signal, the diagnostic signal terminal VZD can output a diagnostic signal, and the reset signal terminal VFW can output a reset signal, and reset the terminal 102, which can be realized by restarting the terminal 102.
Illustratively, the control signal may control the control module 110 to be in an on or off state, when the control module 110 is turned on, the circuit is turned on, the power signal flows through the circuit, and the constant current source module 120 outputs a current backward, and may determine a circuit state, such as a normal on, a normal off, a short circuit or an open circuit state, based on a cooperation relationship between the first diagnostic module 130, the second diagnostic module 140, the protection module 150 and the reset module 160, in combination with the corresponding output diagnostic signal and the reset signal.
Therefore, the circuit state is monitored through the cooperation of the modules.
In some embodiments, with continued reference to fig. 2, the control module 110, the constant current source module 120, the first diagnostic module 130, and the modules are disposed on the control device 101 side, optionally within the control device 101, or proximate to the control device 101; the second diagnostic module 140 and the reset module 160 are disposed on the terminal 102 side, and may optionally be disposed within the terminal 102 or adjacent to the terminal 102.
In this way, the circuit structure layout is made simpler, and monitoring and resetting are facilitated on the control device 101 and terminal 102 sides.
In other embodiments, the spatial arrangement of the modules may be set based on the requirement of the monitoring reset circuit, which is not limited herein.
The series and parallel relationships of the modules in fig. 1 and 2 are merely exemplary, and in other embodiments, the modules may be connected in other manners, and the functions of the modules and the functions of the entire monitoring reset circuit may be implemented, which is not limited herein.
In some embodiments, fig. 3 illustrates a monitoring reset circuit for a serial bus according to an embodiment of the present disclosure. Referring to fig. 3, the control module 110 includes a first control switch T1, a second control switch T2, a first resistor R1, a second resistor R2, a third resistor R3, and a diode D1; the first resistor R1 is connected in series between the control terminal of the first control switch T1 and the control signal terminal VKZ, the second resistor R2 is connected in series between the control terminal of the first control switch T1 and ground, the third resistor R3 and the first control switch T1 are sequentially connected in series between the control terminal of the second control switch T2 and ground, and the diode D1 and the second control switch T2 are sequentially connected in series between the input signal terminal VCC and the first terminal of the constant current source module 120.
Wherein the diode D1 is an anti-reverse diode. The first resistor R1, the second resistor R2 and the first control switch T1 constitute a driving circuit of the second control switch T2, which is used for controlling the on and off states of the second control switch T2 based on the control signal, corresponding to the control module 110 being in the on or off state. The third resistor R3 is a current limiting resistor of the second control switch T2.
When the control module 110 is in an open state based on the control signal, the constant current source module 120 outputs a current signal backward, so as to realize output of the reset level. When the control module 110 is in the off state based on the control signal, standby power consumption may be saved, facilitating the provision of the on and reset signals to the terminal 102.
Illustratively, the second control switch T2 may be selected as a PNP transistor, such as BC 857B; the first control switch T1 can be selected to be an NPN transistor, such as BC 847B; the resistance of the first resistor R1 can be selected to be 10K omega, the resistance of the second resistor R2 can be selected to be 47K omega, and the resistance of the third resistor R3 can be selected to be 10K omega-100K omega. Based on this, when the control signal is a high level signal, the first control switch T1 is turned on, the control end signal of the second control switch T2 is pulled low, and the second control switch T2 is turned on; when the control signal is a low level signal, the first control switch T1 is turned off, the control end signal of the second control switch T2 is a high level signal, and the second control switch T2 is turned off.
In other embodiments, each circuit element in the control module 110 may be configured as an electrical element with other types and parameters, and the control of the open and close states is realized by corresponding control signals, which is not limited herein.
In some embodiments, with continued reference to fig. 3, the constant current source module 120 includes a constant current source reference Z1, a third control switch T3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and a first capacitor C1; the third control switch T3 is a driving switch of the constant current source reference Z1, the fourth resistor R4 is a current limiting resistor of the constant current source reference Z1, the sixth resistor R6 is a set resistor of the constant current source reference Z1, and the fifth resistor R5 and the first capacitor C1 are sequentially connected in series between the control end of the third control switch T3 and the ground.
The output current of the constant current source module 120 is determined by the constant current source reference Z1 and the sixth resistor R6, and the voltage value corresponding to the specific position constant current source reference is divided by the resistance value of the sixth resistor R6.
Illustratively, the constant current source reference Z1 adopts a 2.5V reference, and when the resistance value of the sixth resistor R6 is 2.5K Ω, the output current is 2.5V/2.5K Ω, i.e., 1 mA.
The other electrical elements in the constant current source module 120 are arranged to facilitate the constant current source module 120 to stabilize the output current.
Illustratively, the third control switch T3 is a constant current source driving transistor, which may be selected as an NPN transistor, such as BC 847B; constant current source reference Z1 may be selected as TL 431; the fourth resistor R4 may have a resistance of 1K Ω, and the fifth resistor R5 may have a resistance of 1K Ω.
In other embodiments, the current of the output current of the constant current source module 120 may be set based on the requirement of the serial bus and the monitoring reset circuit thereof, and the type and parameters of each electrical element therein may be set, which is not limited herein.
In some embodiments, with continued reference to fig. 3, the protection module 150 includes an eighth resistor R8 and a zener diode Z2; the eighth resistor R8 is connected in series between the serial bus 100 and the diagnostic signal terminal VZD; a zener diode Z2 is connected in series between the diagnostic signal terminal VZD and ground.
In an open state, that is, the serial bus 110 in fig. 3 is disconnected, at this time, the current flows through the eighth resistor R8, the zener diode Z2 clamps the voltage, and the voltage of the diagnostic signal is the clamping voltage; in the short circuit state, the serial bus 100 is directly grounded, and the diagnostic signal is 0V.
Therefore, the diagnosis signal protection, in particular the diagnosis signal voltage limiting protection is realized through the eighth resistor R8 and the Zener diode Z2.
Illustratively, the resistance of the eighth resistor R8 may be selected to be 10K Ω -100K Ω, and the zener diode Z2 may be selected to be 3.3V zener diode.
In other embodiments, the circuit elements and parameters thereof in the protection module 150 may also be set based on the need to monitor the reset circuit, which is not limited herein.
In some embodiments, with continued reference to FIG. 3, the first diagnostic module 130 includes a seventh resistor R7, and the second diagnostic module 140 includes a ninth resistor R9; the seventh resistor R7 is connected in series between the constant current source module 120 and the serial bus 100; the ninth resistor R9 is connected in series between the serial bus 100 and ground, and the serial bus 100 is also connected to the terminal 102 through a capacitor.
Through the cooperation of the seventh resistor R7 and the ninth resistor R9, the open-circuit state and the short-circuit state can be accurately identified.
Illustratively, the resistance of the seventh resistor R7 may be selected to be 1.1K Ω, and the resistance of the ninth resistor R9 may be selected to be 2.2K Ω.
In combination with the above, in the open circuit state, the output voltage is: the voltage of the power signal minus the voltage drop of the control module and the voltage drop of the constant current source module, taking the application of an automobile as an example, the magnitude of the output voltage may be: the magnitude of the power supply signal (for example, any value in the range of 9V to 16V), the saturation voltage drop of the second control switch T2, the bias voltage of the third control switch T3 (for example, Vbe is 0.7V), and the voltage drop of the sixth resistor R6 (for example, 2.5V) is any value in the range of 5.8V to 12.8V, and at this time, the zener diode Z2 clamps the voltage, and the voltage of the diagnostic signal is 3.3V. In the short-circuit state, the serial bus 100 is grounded, the diagnostic signal terminal VZD is grounded, and the voltage of the diagnostic signal is 0V.
Therefore, the open circuit state and the short circuit state can be accurately identified by distinguishing the diagnosis signals.
In some embodiments, with continued reference to fig. 3, the reset module 160 includes a tenth resistor R10 and a second capacitor C2; the tenth resistor R10 is connected in series between the serial bus 100 and the reset signal terminal VFW; the second capacitor C2 is connected in series between the reset signal terminal VFW and ground.
The tenth resistor R10 and the second capacitor C2 form an RC filter circuit to improve the fluctuation of the reset signal and ensure the stability of the reset signal; the value of which is set based on the requirements of the monitoring reset circuit is not limited herein.
In some embodiments, with continued reference to fig. 2, the third capacitor C3 and the fourth capacitor C4 are high-speed signal coupling capacitors, and the signal transmission rate may be 1000-2000 Gps or other rate values, not limited herein.
The principle of operation and the benefits that can be achieved by the monitoring reset circuit provided by the embodiments of the present disclosure are exemplarily illustrated based on fig. 3 and in conjunction with the parameter settings described above.
Under the normal operating condition, the control signal is a high level signal, the constant current source module 120 outputs a 1mA current, and the voltage of the diagnosis signal is determined based on the calculation of the ninth resistor R9: the terminal 102 can be reset by outputting a high level, for example, 2.2V, with a reset signal of 2.2K Ω ═ 2.2V.
In a normal off state, the control signal is a low level signal, the output current of the constant current source module 120 is 0mA, that is, no current is output, and the terminal 102 can be reset correspondingly without voltage output, that is, the diagnostic signal is 0V, and the reset signal is 0V.
The normal operating state and the normal off state are both normal states, and the abnormal state includes an open state and a short-circuit state, which will be described below.
In the open state, the diagnostic signal is clamped and, in combination with the setting of the zener diode Z2, the diagnostic signal may be 3.3V.
In the short-circuit state, the diagnostic signal end VZD is directly grounded, and the diagnostic signal is 0V.
Therefore, the monitoring reset circuit provided by the embodiment of the disclosure utilizes the current source to design the control switch logic, and can realize the control logic transmission and control of signals without changing any wiring harness of a transmission line. The diagnosis signal and the reset signal can be utilized to accurately identify the circuit state, namely realize monitoring; meanwhile, when the terminal fails, the reset signal can be accurately output without any extra wiring harness change, so that the terminal is reset, including the control signal received by the terminal is completely reset.
On the basis of the above embodiment, the embodiment of the present disclosure further provides a vehicle-mounted system, which includes any one of the above monitoring reset circuits for a serial bus, and can achieve a corresponding effect.
Illustratively, the in-vehicle system may include an audio-visual entertainment module, a call module, a navigation module, and other functional modules, which are not limited herein.
The embodiment of the disclosure also provides a vehicle, which comprises any one of the monitoring reset circuits of the serial bus or any one of the vehicle-mounted systems, and can realize corresponding effects.
In other embodiments, the vehicle may further include at least one of a drive system, a cabin temperature control system, a cabin brightness adjustment system, a driver assistance system, and an autopilot system, without limitation.
For example, the vehicle may be an automatic driving vehicle, or may be a manual driving vehicle, which is not limited herein.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A monitoring reset circuit for a serial bus, comprising: the device comprises a serial bus, a control module, a constant current source module, a first diagnosis module, a second diagnosis module and a reset module;
the serial bus is connected between the control equipment and the terminal; the control module, the constant current source module and the first diagnosis module are all arranged in the control equipment, and the second diagnosis module and the reset module are arranged in the terminal; the control module is a module which responds to a control signal of the control device to control whether the constant current source module outputs current, the constant current source module is a module which responds to the control of the control module to output a constant current control signal, the first diagnosis module and the second diagnosis module are modules which cooperatively detect the connection state of the serial bus and the abnormal state of the terminal, and the reset module is a module which resets the terminal;
the control module, the constant current source module and the first diagnosis module are sequentially connected in series and connected to the serial bus; the second diagnostic module and the reset module are connected in parallel and are connected to the serial bus.
2. The monitoring reset circuit of claim 1, wherein the control module comprises a first terminal, a second terminal and a third terminal, the first terminal of the control module is a port for receiving an input signal, the second terminal of the control module is a port for receiving a control signal, and the third terminal of the control module is connected to the constant current source module.
3. The monitoring reset circuit of claim 1, further comprising a protection module; the protection module is used for performing voltage reduction protection on a diagnosis signal, and the diagnosis signal is generated in response to the connection state of the serial bus or the abnormal state of the terminal;
the protection module is arranged in the control equipment and is connected with the serial bus.
4. The monitoring reset circuit of any one of claims 1-3, wherein the control module comprises a first control switch, a second control switch, a first resistor, a second resistor, a third resistor, and a diode;
the first resistor is connected in series between the control end of the first control switch and the control signal end, the second resistor is connected in series between the control end of the first control switch and the ground, the third resistor and the first control switch are sequentially connected in series between the control end of the second control switch and the ground, and the diode and the second control switch are sequentially connected in series between the input signal end and the first end of the constant current source module.
5. The monitor reset circuit of any one of claims 1-3 wherein the constant current source module comprises a constant current source reference, a third control switch, a fourth resistor, a fifth resistor, a sixth resistor, and a first capacitor;
the third control switch is a drive switch based on the constant current source, the fourth resistor is a current-limiting resistor based on the constant current source, the sixth resistor is a set resistor based on the constant current source, and the fifth resistor and the first capacitor are sequentially connected in series between the control end of the third control switch and the ground.
6. The monitor reset circuit of any of claims 1-3 wherein the first diagnostic module includes a seventh resistor and the second diagnostic module includes a ninth resistor;
the seventh resistor is connected in series between the constant current source module and the serial bus;
the ninth resistor is connected in series between the serial bus and the ground, and the serial bus is also connected with the terminal through a capacitor.
7. The monitoring reset circuit of claim 3, wherein the protection module comprises an eighth resistor and a zener diode;
the eighth resistor is connected in series between the serial bus and the diagnostic signal terminal;
the Zener diode is connected in series between the diagnostic signal terminal and ground.
8. The monitoring reset circuit of any one of claims 1-3, wherein the reset module comprises a tenth resistor and a second capacitor;
the tenth resistor is connected in series between the serial bus and the reset signal end;
the second capacitor is connected in series between the reset signal end and the ground.
9. An on-board system comprising the monitor reset circuit of any of claims 1-8.
10. A vehicle comprising a monitor reset circuit according to any one of claims 1 to 8 or comprising an on-board system according to claim 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120611461.8U CN214311386U (en) | 2021-03-25 | 2021-03-25 | Monitoring reset circuit of serial bus, on-vehicle system and vehicle |
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| CN202120611461.8U CN214311386U (en) | 2021-03-25 | 2021-03-25 | Monitoring reset circuit of serial bus, on-vehicle system and vehicle |
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| CN214311386U true CN214311386U (en) | 2021-09-28 |
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| CN202120611461.8U Active CN214311386U (en) | 2021-03-25 | 2021-03-25 | Monitoring reset circuit of serial bus, on-vehicle system and vehicle |
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| CN (1) | CN214311386U (en) |
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