CN219875084U - Protection circuit, protection system and vehicle - Google Patents
Protection circuit, protection system and vehicle Download PDFInfo
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- CN219875084U CN219875084U CN202321305028.7U CN202321305028U CN219875084U CN 219875084 U CN219875084 U CN 219875084U CN 202321305028 U CN202321305028 U CN 202321305028U CN 219875084 U CN219875084 U CN 219875084U
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- 239000004973 liquid crystal related substance Substances 0.000 claims 10
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- 238000004891 communication Methods 0.000 description 1
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- 238000007689 inspection Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
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Abstract
The utility model discloses a protection circuit, a protection system and a vehicle, which belong to the technical field of electronics, wherein the protection circuit comprises a controller provided with a first input end and a first output end, and also comprises a signal output end, and a signal receiving module, a signal conversion module and an acquisition module which are sequentially connected in series; the signal receiving module is connected between the first output end and the signal conversion module; the signal conversion module is connected between the signal receiving module and the acquisition module; the acquisition module is connected between the signal conversion module and the first input end, and the signal output end is arranged between the signal conversion module and the acquisition module. According to the utility model, the signal conversion module and the acquisition module are arranged to monitor and protect the electric signals acquired by the controller, and when the signal output end is short to the ground, the signal conversion module limits the current output to the signal output end, so that the phenomenon that the overcurrent is burnt due to the rapid increase of the current in the controller is prevented, and the working reliability of the controller is improved.
Description
Technical Field
The utility model relates to the technical field of electronics, in particular to a protection circuit, a protection system and a vehicle.
Background
When the controllers in the automobile are matched for application, various digital output signals reach other controllers or actuators, but due to the specificity of the electronic application of the automobile, the output signals are required to have the protection functions of short-circuiting to a power supply and short-circuiting to the ground.
The existing scheme is that when voltage is acquired by the voltage acquisition unit, the acquired voltage is compared with preset voltage by the cut-off circuit, when the acquired voltage is larger than the preset voltage, the cut-off circuit cuts off the circuit inside the controller so as to achieve the purpose of protection, but if the short circuit occurs at the output end acquired by the voltage acquisition unit, the voltage is not zero and is smaller than the preset voltage, the cut-off circuit can not cut off the circuit inside the controller at the moment, and because the current is larger at the moment, the internal components of the controller can be burnt due to the overlarge current, and the working reliability of the controller is lower.
Disclosure of Invention
In order to solve at least one technical problem in the background art, the utility model provides a protection circuit, a protection system and a vehicle.
According to a first aspect, an embodiment of the present utility model provides a protection circuit, including a controller, where the controller is provided with a first input end and a first output end, and the protection circuit further includes a signal output end, and a signal receiving module, a signal converting module, and an acquisition module that are sequentially connected in series; the signal receiving module is connected between the first output end and the signal conversion module and is used for receiving a control signal sent by the controller; the signal conversion module is connected between the signal receiving module and the acquisition module and is used for converting the control signal into a digital signal and outputting the digital signal and limiting the output current of the signal output end; the acquisition module is connected between the signal conversion module and the first input end and is used for acquiring the voltage value of the digital signal, and the signal output end is arranged between the signal conversion module and the acquisition module.
Optionally, the signal conversion module comprises a power supply, a bias circuit, a first resistor and a first diode; one end of the bias circuit is connected with the power supply, the other end of the bias circuit is connected with the first resistor and the positive electrode of the first diode respectively, and the other end of the first resistor, which is far away from the bias circuit, is connected with the signal receiving module.
Optionally, the bias circuit includes a voltage division protection component, a voltage stabilizing component and a second resistor; the voltage stabilizing component is connected with the second resistor in parallel, and the voltage stabilizing component and the second resistor which are connected in parallel are connected between the power supply and the voltage division protection component in series.
Optionally, the voltage stabilizing component comprises a third resistor and a second diode, one end of the third resistor is connected with the power supply, the other end of the third resistor is connected with the positive electrode of the second diode, the negative electrode of the second diode is connected with the first port of the voltage dividing protection component, one end, far away from the power supply, of the second resistor is connected with the second port of the voltage dividing protection component, and the third port of the voltage dividing protection component is connected with the positive electrode of the first diode.
Optionally, the signal receiving module comprises a fourth resistor, a fifth resistor, a sixth resistor and a second control switch; one end of the fourth resistor is connected with the first output end, the other end of the fourth resistor is respectively connected with the sixth resistor and the fourth end of the second control switch, and one end, far away from the fourth resistor, of the sixth resistor is grounded; the fifth end of the second control switch is connected with one end of the fifth resistor, the other end of the fifth resistor is grounded, and the sixth end of the second control switch is connected with the signal conversion module.
Optionally, the acquisition module comprises a seventh resistor and an eighth resistor; one end of the seventh resistor is connected to the signal output end, the other end of the seventh resistor is connected to the first input end, one end of the eighth resistor is connected between the seventh resistor and the first input end, and the other end of the eighth resistor is grounded.
Optionally, the voltage division protection component comprises one of a transistor and a field effect transistor.
Optionally, the device also comprises an alarm device which is connected with the controller.
According to a second aspect, the present utility model provides a protection system, including a protection circuit according to any one of the embodiments described above.
According to a third aspect, the utility model proposes a vehicle comprising a protection system according to any one of the embodiments described above.
In the embodiment of the utility model, the signal receiving module, the signal conversion module and the acquisition module are arranged at the corresponding positions between the controller and the signal output end, when the controller sends out a control signal, the signal receiving module is conducted, and then the signal conversion module is conducted, the signal conversion module converts the control signal into a digital signal and outputs the digital signal to the signal output end, meanwhile, the acquisition module acquires the voltage of the control signal, acquires acquisition current according to the acquisition voltage, monitors the state of the signal sent by the controller, and when the signal output end is short-circuited to the ground, the signal conversion module can limit the current value output to the signal output end, so that the electrical signal acquired by the acquisition module is of a low level, short-circuit protection of the controller is realized, and the condition that components in the controller are burnt due to overlarge current acquired by the acquisition module when the signal output end is short-circuited is avoided.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model and do not constitute a limitation on the utility model. In the drawings:
FIG. 1 is a schematic diagram of an alternative protection circuit according to an embodiment of the present utility model;
fig. 2 is another schematic diagram of an alternative protection circuit according to an embodiment of the present utility model.
Detailed Description
For a clearer understanding of the technical features, objects and effects of the present utility model, embodiments of the present utility model will now be described with reference to the drawings, in which like reference numerals refer to identical or structurally similar but functionally identical components throughout the separate views.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model, however, the present utility model may be practiced in other ways than those described herein, and therefore the scope of the present utility model is not limited to the specific embodiments disclosed below.
As described in the background art, when the controllers in the automobile are matched, various digital output signals reach other controllers or actuators, but due to the specificity of the electronic application of the automobile, the output signals are required to have protection functions of shorting to a power source and shorting to ground.
The existing scheme is that when voltage is acquired by the voltage acquisition unit, the acquired voltage is compared with preset voltage by the cut-off circuit, when the acquired voltage is larger than the preset voltage, the cut-off circuit cuts off the circuit inside the controller so as to achieve the purpose of protection, but if the short circuit occurs at the output end acquired by the voltage acquisition unit, the voltage is not zero and is smaller than the preset voltage, the cut-off circuit can not cut off the circuit inside the controller at the moment, and because the current is larger at the moment, the internal components of the controller can be burnt due to the overlarge current, and the working reliability of the controller is lower.
Thus, according to a first aspect of the present utility model, a protection circuit is proposed, as shown in fig. 1 and 2, comprising a controller 10, said controller 10 being provided with a first input 102 and a first output 101, the protection circuit further comprising a signal output 50, and a signal receiving module 20, a signal converting module 30 and an acquisition module 40 in series; the signal receiving module 20 is connected between the first output end 101 and the signal converting module 30, and is configured to receive a control signal sent by the controller 10; the signal conversion module 30 is connected between the signal receiving module 20 and the acquisition module 40, and is configured to convert the control signal into a digital signal and output the digital signal, and limit the output current of the signal output terminal 50; the acquisition module 40 is connected between the signal conversion module 30 and the first input end 102, and is configured to acquire a voltage value of a digital signal, and the signal output end 50 is disposed between the signal conversion module 30 and the acquisition module 40.
In this embodiment, the signal receiving module 20, the signal converting module 30 and the collecting module 40 are disposed at corresponding positions between the controller 10 and the signal output end 50, when the controller 10 sends a control signal, the signal receiving module 20 is turned on, and then the signal converting module 30 is turned on, the signal converting module 30 converts the control signal into a digital signal and outputs the digital signal to the signal output end 50, meanwhile, the collecting module 40 collects the voltage of the control signal, and can obtain the collected current according to the collected voltage, so as to monitor the signal state sent by the controller 10, when the signal output end 50 is short-circuited to the ground, the signal converting module 30 can limit the current value output to the signal output end 50, so that the electrical signal collected by the collecting module 40 is at a low level, short-circuit protection of the controller 10 is realized, and the condition that the components inside the controller 10 are burnt due to the overlarge current collected by the collecting module 40 is avoided when the signal output end 50 is short-circuited is generated.
As an exemplary embodiment, the signal conversion module 30 includes a power supply 60, a bias circuit, a first resistor R1, and a first diode D1; one end of the bias circuit is connected to the power supply 60, the other end of the bias circuit is connected to the first resistor R1 and the anode of the first diode D1, and the other end of the first resistor R1 away from the bias circuit is connected to the signal receiving module 20.
In this embodiment, when the signal output end 50 is normally connected, the bias circuit acts as a switch and realizes conversion of a control signal, and when the signal receiving module 20 receives the control signal, the signal receiving module 20 is turned on, so that the bias circuit is communicated with the signal receiving module 20 through the first resistor R1, and the bias circuit is turned on, so that current reaches the signal output end 50 from the power supply 60 sequentially through the bias circuit and the first diode D1, and signal output is completed; when the signal output end 50 is short-circuited, the bias circuit limits the current flowing through the first diode D1 to be reduced, so that the voltage value collected by the collection module 40 is reduced, the current is prevented from being increased sharply due to the fact that the power supply 60 is communicated with the ground wire when the signal output end 50 is short-circuited, the voltage value collected by the collection module 40 is increased, and components inside the controller 10 are burnt.
As an exemplary embodiment, the bias circuit includes a voltage division protection component T1, a voltage stabilizing component, and a second resistor R2; the voltage stabilizing component is connected in parallel with the second resistor R2, and the voltage stabilizing component and the second resistor R2 connected in parallel are connected in series between the power supply 60 and the voltage division protection component T1. The voltage stabilizing component comprises a third resistor R3 and a second diode D2, one end of the third resistor R3 is connected with the power supply 60, the other end of the third resistor R3 is connected with the positive electrode of the second diode D2, the negative electrode of the second diode D2 is connected with the first port of the voltage dividing protection component T1, one end, far away from the power supply 60, of the second resistor R2 is connected with the second port of the voltage dividing protection component T1, and the third port of the voltage dividing protection component T1 is connected with the positive electrode of the first diode D1. The voltage division protection component T1 comprises one of a transistor and a field effect transistor.
In this embodiment, the voltage division protection component T1 is illustrated by taking a PNP transistor as an example, after the signal receiving module 20 is turned on based on a control signal, the voltage division protection component T1 is connected to the signal receiving module 20 through the first resistor R1, and the voltage division protection component T1 is turned on, so that the power supply 60 completes communication with the signal output end 50 through the second resistor R2, the voltage division protection component T1 and the first diode D1 in sequence, and completes signal transmission.
When the signal output end 50 is shorted, the current of the signal output end 50 is increased instantaneously, that is, the collector current of the voltage division protection component T1 is increased instantaneously, the collector current is a part of the emitter current, the base current is smaller than the collector current, the influence caused by the change of the base current is negligible, then the current of the emitter is increased instantaneously, the voltage of the second resistor R2 is increased, the voltage of the third resistor R3 is smaller and cannot change along with the change of the second resistor R2, so that the voltage division protection component T1 enters an amplifying region, the voltage division protection component T1 divides into voltages, the voltage of the second resistor R2 is reduced, the voltage of the third resistor R3 is further reduced along with the voltage of the second resistor R2, the base current is reduced, the base current and the collector current are in positive correlation in the amplifying region of the triode, the reduction of the base current can cause synchronous reduction of the current of the collector, and further reduce the current value of the current flowing to the signal output end 50, and the current value collected by the collecting module 40 is prevented from being excessively large, and the internal components of the controller 10 are burnt.
As an exemplary embodiment, the signal receiving module 20 includes a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and a second control switch T2; one end of the fourth resistor R4 is connected to the first output end 101, the other end of the fourth resistor R4 is connected to the sixth resistor R6 and the fourth end of the second control switch T2, and one end of the sixth resistor R6 far from the fourth resistor R4 is grounded; the fifth end of the second control switch T2 is connected to one end of the fifth resistor R5, the other end of the fifth resistor R5 is grounded, and the sixth end of the second control switch T2 is connected to the signal conversion module 30.
In this embodiment, the second control switch T2 is illustrated by taking an NPN triode as an example, besides that, the second control switch T2 may also be a mos transistor or other devices with a switching function, after the controller 10 sends a control signal, the base of the second control switch T2 receives a high level and is turned on, so as to connect the signal conversion module 30 with the fifth resistor R5, and then turn on the third resistor R3 and the second diode D2, to provide a turn-on voltage for the base of the voltage division protection component T1, so that the voltage division protection component T1 is turned on, the turn-on power supply 60 is communicated with the signal output end 50, and the conversion from the control signal to the digital signal is completed.
As an exemplary embodiment, the acquisition module 40 includes a seventh resistor R7 and an eighth resistor R8; one end of the seventh resistor R7 is connected to the signal output end 50, the other end is connected to the first input end 102, one end of the eighth resistor R8 is connected between the seventh resistor R7 and the first input end 102, and the other end of the eighth resistor R8 is grounded.
In this embodiment, the eighth resistor R8 is connected between the ground line and the first input terminal 102 of the controller 10 and between the seventh resistor R7 and the first input terminal 102 of the controller 10, and the seventh resistor R7 and the eighth resistor R8 form a voltage division detection circuit for detecting the voltage of the signal output terminal 50, when the signal output terminal 50 is shorted, the voltage division protection component T1 limits the base current and further limits the current of the collector of the voltage division detection component, so that the voltage value input to the first input terminal 102 is smaller at this time, the current value is smaller as well, the occurrence of burnout of internal components of the controller 10 due to the overlarge current value is avoided, and the reliability of the operation of the controller 10 is improved.
As an exemplary embodiment, the protection circuit further comprises an alarm device 70 connected to the controller 10.
In this embodiment, the alarm device 70 is connected to the controller 10, and when the controller 10 determines that the current signal output end 50 is shorted according to the electrical signal received by the first input end 102, the controller 10 controls the alarm device 70 to send an alarm to remind the driver to perform maintenance and inspection, so as to avoid causing secondary damage to the related control system.
According to a second aspect of the present utility model, there is also provided a protection system comprising the protection circuit according to any one of the embodiments described above.
According to a third aspect of the present utility model, there is also provided a vehicle comprising a protection system according to any one of the embodiments described above.
Thus far, the technical solution of the present disclosure has been described in connection with the foregoing embodiments, but it is easily understood by those skilled in the art that the protective scope of the present disclosure is not limited to only these specific embodiments. The technical solutions in the above embodiments may be split and combined by those skilled in the art without departing from the technical principles of the present disclosure, and equivalent modifications or substitutions may be made to related technical features, which all fall within the scope of the present disclosure.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for system embodiments, since they are substantially similar to method embodiments, the description is relatively simple, as relevant to see a section of the description of method embodiments.
The foregoing is merely exemplary of the present utility model and is not intended to limit the present utility model. Various modifications and variations of the present utility model will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are to be included in the scope of the claims of the present utility model.
Claims (10)
1. The protection circuit is characterized by comprising a controller, wherein the controller is provided with a first input end and a first output end, and the protection circuit further comprises a signal output end, a signal receiving module, a signal conversion module and an acquisition module which are connected in series; wherein, the liquid crystal display device comprises a liquid crystal display device,
the signal receiving module is connected between the first output end and the signal conversion module and is used for receiving a control signal sent by the controller;
the signal conversion module is connected between the signal receiving module and the acquisition module and is used for converting the control signal into a digital signal and outputting the digital signal and limiting the output current of the signal output end;
the acquisition module is connected between the signal conversion module and the first input end and is used for acquiring the voltage value of the digital signal, and the signal output end is arranged between the signal conversion module and the acquisition module.
2. The protection circuit of claim 1, wherein the signal conversion module comprises a power supply, a bias circuit, a first resistor, and a first diode; wherein, the liquid crystal display device comprises a liquid crystal display device,
one end of the bias circuit is connected with the power supply, the other end of the bias circuit is connected with the first resistor and the positive electrode of the first diode respectively, and the other end of the first resistor, which is far away from the bias circuit, is connected with the signal receiving module.
3. The protection circuit of claim 2, wherein the bias circuit comprises a voltage division protection component, a voltage stabilizing component, and a second resistor; wherein, the liquid crystal display device comprises a liquid crystal display device,
the voltage stabilizing component is connected with the second resistor in parallel, and the voltage stabilizing component and the second resistor which are connected in parallel are connected between the power supply and the voltage division protection component in series.
4. The protection circuit of claim 3, wherein the voltage stabilizing component comprises a third resistor and a second diode, one end of the third resistor is connected with the power supply, the other end of the third resistor is connected with the positive electrode of the second diode, the negative electrode of the second diode is connected with the first port of the voltage dividing protection component, one end of the second resistor, which is far away from the power supply, is connected with the second port of the voltage dividing protection component, and the third port of the voltage dividing protection component is connected with the positive electrode of the first diode.
5. The protection circuit of claim 1, wherein the signal receiving module comprises a fourth resistor, a fifth resistor, a sixth resistor, and a second control switch; wherein, the liquid crystal display device comprises a liquid crystal display device,
one end of the fourth resistor is connected with the first output end, the other end of the fourth resistor is respectively connected with the sixth resistor and the fourth end of the second control switch, and one end, far away from the fourth resistor, of the sixth resistor is grounded;
the fifth end of the second control switch is connected with one end of the fifth resistor, the other end of the fifth resistor is grounded, and the sixth end of the second control switch is connected with the signal conversion module.
6. The protection circuit of claim 1, wherein the acquisition module comprises a seventh resistor and an eighth resistor; wherein, the liquid crystal display device comprises a liquid crystal display device,
one end of the seventh resistor is connected to the signal output end, the other end of the seventh resistor is connected to the first input end, one end of the eighth resistor is connected between the seventh resistor and the first input end, and the other end of the eighth resistor is grounded.
7. The protection circuit of claim 3, wherein the voltage division protection component comprises one of a transistor and a field effect transistor.
8. The protection circuit of claim 1, further comprising an alarm device coupled to the controller.
9. A protection system comprising a protection circuit as claimed in any one of claims 1 to 8.
10. A vehicle comprising the protection system of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321305028.7U CN219875084U (en) | 2023-05-25 | 2023-05-25 | Protection circuit, protection system and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321305028.7U CN219875084U (en) | 2023-05-25 | 2023-05-25 | Protection circuit, protection system and vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219875084U true CN219875084U (en) | 2023-10-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321305028.7U Active CN219875084U (en) | 2023-05-25 | 2023-05-25 | Protection circuit, protection system and vehicle |
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| Country | Link |
|---|---|
| CN (1) | CN219875084U (en) |
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2023
- 2023-05-25 CN CN202321305028.7U patent/CN219875084U/en active Active
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