CN209472611U - The three-state input detection circuit and automobile of car switch signal - Google Patents
The three-state input detection circuit and automobile of car switch signal Download PDFInfo
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- CN209472611U CN209472611U CN201920243171.5U CN201920243171U CN209472611U CN 209472611 U CN209472611 U CN 209472611U CN 201920243171 U CN201920243171 U CN 201920243171U CN 209472611 U CN209472611 U CN 209472611U
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- current limliting
- switch signal
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Abstract
The utility model discloses the three-state input detection circuit and automobile of a kind of car switch signal, the three-state input detection circuit of the car switch signal includes switch signal input end, power supply, current limliting bleeder circuit, main control chip and switching signal output end, switch signal input end is connect with the first end of current limliting bleeder circuit, the second end of current limliting bleeder circuit is connect with the output end of power supply and switching signal respectively, the test side connection switch signal output end of main control chip；Wherein, the reference voltage of current limliting bleeder circuit, voltage for inputting to switch signal input end or power supply output is carried out after current limliting partial pressure and is exported；Main control chip, for detecting the voltage signal after current limliting divides, using the voltage of identification switch signal input part input as high level, low level or vacant state.Technical solutions of the utility model solve the safety issue of automobile mounted product.
Description
Technical field
The utility model relates to automobile technical field, in particular to a kind of three-state input detection circuit of car switch signal
And automobile.
Background technique
Car switch signal mainly monitors automotive control system operating condition or working condition as a kind of trigger signal,
ECU (automotive electronics is integrated) is provided signals to when operating condition or state change, and is allowed to react.Switching signal is mainly divided
The trigger signal that is positive and two kinds of negative trigger, positive trigger signal is by switch by automobile power source cathode voltage (high level signal)
ECU is sent to, such as gear on-off signal, brake switch signal, electronic-controlled power steering switching signal, air conditioning control source switching signal；
Negative trigger sends automobile power source cathode voltage (low level signal) to ECU by switch, such as rear door switching signal, rain
Scrape on-off model, main furnace building light switch signal.Control or trigger condition of the switching signal as ECU will affect determining for related ECU
Plan and judgement, the switch detection circuit on general automobile can only detect two kinds of working conditions: normal operating conditions and inoperative shape
State, just can not be timely when being in abnormal operating state (such as short circuit) for the external load of switch signal input end in this way
It detects, if external load will be damaged by working on, will cause the paralysis of whole system when serious.
Utility model content
The main purpose of the utility model is to propose a kind of three-state input detection circuit of car switch signal, it is intended to be improved
The safety of automobile mounted product.
To achieve the above object, the utility model proposes car switch signal three-state input detection circuit, the vapour
The three-state input detection circuit of stopping switch signal includes switch signal input end, power supply, current limliting bleeder circuit, main control chip and opens
OFF signal output end, the switch signal input end are connect with the first end of the current limliting bleeder circuit, the current limliting partial pressure electricity
The second end on road is connect with the output end of the power supply and the switching signal respectively, and the test side of the main control chip connects institute
State switching signal output end；Wherein,
The current limliting bleeder circuit, the reference electricity of voltage or power supply output for being inputted to switch signal input end
After pressure progress current limliting partial pressure and export；
The main control chip, for detecting the voltage signal after current limliting divides, to identify the switch signal input end
The voltage of input is high level, low level or vacant state.
Optionally, the value of the reference voltage of the power supply output is 5V, the high level of the switch signal input end input
Low level for 12V or 24V, the switch signal input end input is 0V.
Optionally, the current limliting bleeder circuit includes first resistor and second resistance, and the first end of the first resistor is
The first end of the current limliting bleeder circuit, the second end of the first resistor are connect with the first end of the second resistance, and institute
The common end for stating the second end of first resistor and the first end of the second resistance is the second end of the current limliting bleeder circuit, institute
State the second end ground connection of second resistance.
Optionally, the main control chip includes ADC detection circuit, for detecting through current limliting bleeder circuit treated voltage
Signal.
Optionally, the three-state input detection circuit of the car switch signal further includes first diode, and the described 1st
The first end of pole pipe is connected between the second end of the current limliting bleeder circuit and the output end of the switching signal, and described first
The second end of diode is grounded.
Optionally, the three-state input detection circuit of the car switch signal further includes the second diode, and the described 2nd 2
The cathode of pole pipe is connected between the switch signal input end and the first end of the current limliting bleeder circuit, the two or two pole
The plus earth of pipe.
Optionally, the three-state input detection circuit of the car switch signal further includes 3rd resistor and third diode,
The 3rd resistor first end is separately connected the cathode of second diode and the first end of the current limliting bleeder circuit, described
The second end of 3rd resistor connects the cathode of the third diode, the anode connection reference voltage of the third diode.
Optionally, the three-state input detection circuit of the car switch signal further includes first capacitor, the first capacitor
First end be separately connected the second end of the current limliting bleeder circuit, the first end of the first diode and the switching signal
Output end, the second end ground connection of the first capacitor.
To achieve the above object, the utility model also proposes that a kind of automobile, the automobile include automotive control system detection
It holds, the three-state input detection circuit of vehicle microcomputer controller and car switch signal as described above, the switching signal input
End is connect with the control system test side, and the output end of the switching signal is connect with the microcomputerized controller.
Technical solutions of the utility model include switching signal by using the three-state input detection circuit of car switch signal
Input terminal, power supply, current limliting bleeder circuit, main control chip and switching signal output end, the switch signal input end and the limit
The first end of flow point volt circuit connects, so that the voltage signal or reference voltage signal of switch signal input end input pass through
The current limliting of current limliting bleeder circuit divides, and realizes the control to voltage output；The second end of the current limliting bleeder circuit respectively with institute
It states power supply to connect with the output end of the switching signal, makes the voltage after current limliting divides defeated from switching signal output end with this
Out；The test side of the main control chip connects the switching signal output end；Wherein, the current limliting bleeder circuit, for split
After the voltage of OFF signal input terminal input or the reference voltage progress current limliting partial pressure of power supply output and export；The main control chip,
For detecting the voltage signal after current limliting divides so that main control chip detect through current limliting bleeder circuit treated electricity
Signal is pressed, realizes that judgement identifies switching signal high level, low level, hanging three kinds of states.The utility model solves automobile
Upper switch detection circuit detects high level signal and low level signal, and there are vehicle-mounted products to be in the abnormal operating states such as short circuit
Shi Wufa detects the case where signal in time, and automobile, which works on, will lead to the damage of vehicle-mounted product.The utility model improves
The safety of automobile mounted product.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, the structure that can also be shown according to these attached drawings obtains other attached drawings.
Fig. 1 is the circuit structure signal of one embodiment of three-state input detection circuit of the utility model car switch signal
Figure.
Drawing reference numeral explanation:
The realization of the utility model aim, functional characteristics and it can put that the embodiments will be further described with reference to the accompanying drawings.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describing, it is clear that described embodiment is only a part of the embodiment of the utility model, rather than all
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, fall within the protection scope of the utility model.
It is to be appreciated that if related in the utility model embodiment directionality instruction (such as upper and lower, left and right, it is preceding,
Afterwards ...), then directionality instruction is only used for explaining opposite between each component under a certain particular pose (as shown in the picture)
Positional relationship, motion conditions etc., if the particular pose changes, directionality instruction is also correspondingly changed correspondingly.
In addition, if relating to the description of " first ", " second " etc. in the utility model embodiment, " first ", " the
Two " etc. description is used for description purposes only, and is not understood to indicate or imply its relative importance or is implicitly indicated meaning
The quantity of the technical characteristic shown." first " is defined as a result, the feature of " second " can explicitly or implicitly include at least one
A this feature.It in addition, the technical solution between each embodiment can be combined with each other, but must be with ordinary skill
Based on personnel can be realized, this technical side will be understood that when the combination of technical solution appearance is conflicting or cannot achieve
The combination of case is not present, also not within the protection scope of the requires of the utility model.
The utility model proposes a kind of three-state input detection circuits of car switch signal.
In the utility model embodiment, as shown in Figure 1, the three-state input detection circuit of the car switch signal includes opening
OFF signal input terminal 100, power supply, current limliting bleeder circuit 200, main control chip 300 and switching signal output end 400, the switch
Signal input part 100 is connect with the first end of the current limliting bleeder circuit 200, the second end point of the current limliting bleeder circuit 200
It is not connect with the output end of the power supply and the switching signal, the test side of the main control chip 300 connects the switch letter
Number output end 400；Wherein,
The current limliting bleeder circuit 200, the voltage or the power supply for inputting to the switch signal input end 100 are defeated
After reference voltage progress current limliting partial pressure out and export；
The main control chip 300, for detecting the voltage signal after current limliting divides, to identify the switching signal input
The voltage of 100 input of end is high level, low level or vacant state.
In the present embodiment, the current limliting bleeder circuit 200 includes first resistor R1 and second resistance R2, the first resistor
The first end of R1 is the first end of the current limliting bleeder circuit 200, the second end and the second resistance of the first resistor R1
The first end of R2 connects, and the common end of the second end of the first resistor R1 and the first end of the second resistance R2 is described
The second end of current limliting bleeder circuit 200, the second end ground connection of the second resistance R2.So that switch signal input end 100 is defeated
The voltage signal or reference voltage signal entered is by the first resistor R1 and second resistance R2 current limliting in current limliting bleeder circuit 200
Partial pressure, realization export after handling the voltage signal that switching signal inputs from switching signal output end 400.
In the present embodiment, the main control chip 300 includes ADC detection circuit, for detecting at through current limliting bleeder circuit 200
Voltage signal after reason.So that main control chip 300 is detected through treated the voltage signal of current limliting bleeder circuit 200, it is real
Now judge switching signal high level, low level, hanging three kinds of states.
It should be noted that the switching signal level of automobile is 12V or 24V, when the letter that switch signal input end 100 inputs
ADC detection circuit inspection when number being high level, after first resistor R1 and second resistance R2 current limliting partial pressure in main control chip 300
The voltage measured is the first voltage value；When the signal that switch signal input end 100 inputs is vacant state, reference voltage VCC
The voltage that ADC detection circuit after first resistor R1 and second resistance R2 current limliting partial pressure in main control chip 300 detects is
Second voltage value；ADC detection circuit when the signal that switch signal input end 100 inputs is low level, in main control chip 300
The voltage detected is third voltage value.By judging the size of the first voltage value, second voltage value and third voltage value to sentence
The state for the switching signal that disconnected switch signal input end 100 inputs.It is understood that vacant state is high-impedance state, at this time
Resistance is very big, is equivalent to partition state, circuit is also that is, open circuit.
In an alternative embodiment, as shown in Figure 1, the switching signal level of automobile is 12V or 24V namely switching signal
Input terminal 100 inputs 12V or 24V, and first resistor R1 is 5K Ω, and second resistance R2 is 10K Ω, and 3rd resistor R3 is 10K Ω, the
One capacitor C1 is 100pF, when reference voltage VCC is 5V；At this time when the signal that switch signal input end 100 inputs is high level
ADC detection circuit detection when 12V or 24V, after first resistor R1 and second resistance R2 current limliting partial pressure in main control chip 300
The voltage arrived is 1.4V or 2.8V；When the signal that switch signal input end 100 inputs is vacant state open circuit, reference voltage
The voltage that ADC detection circuit of the VCC after first resistor R1 and second resistance R2 current limliting partial pressure in main control chip 300 detects
For 0.5V；ADC detection circuit inspection when the signal that switch signal input end 100 inputs is low level 0V, in main control chip 300
The voltage measured is 0V.The voltage signal detected by main control chip 300 can accurately judge that car switch signal is defeated
The state for entering the car switch signal of 100 input of end, solves automobile upper switch detection circuit detection high level signal and low electricity
Ordinary mail number, there are can not detect signal when vehicle-mounted product is in the abnormal operating states such as short circuit in time.
Further, the three-state input detection circuit of the car switch signal further includes first diode D1, and described
The first end of one diode D1 be connected to the current limliting bleeder circuit 200 second end and the switching signal output end it
Between, the second end of the first diode D1 is grounded.It is understood that first diode D1 is bi-directional voltage stabilizing diode, this
Locating bi-directional voltage stabilizing diode can be the issuable high voltage transient clamper of switching signal in 3.3V or so, and protective switch signal is defeated
The main control chip 300 of outlet 400 is not damaged.
Technical solutions of the utility model include switching signal by using the three-state input detection circuit of car switch signal
Input terminal 100, reference signal input terminal, current limliting bleeder circuit 200, main control chip 300 and switching signal output end 400, it is described
Switch signal input end 100 is connect with the first end of the current limliting bleeder circuit 200, so that switch signal input end 100 is defeated
The voltage signal or reference voltage signal entered is divided by the current limliting of current limliting bleeder circuit 200, realizes the control to voltage output
System；The second end of the current limliting bleeder circuit 200 is connect with the output end of the switching signal, is made after current limliting divides with this
Voltage from switching signal output end 400 export；The test side of the main control chip 300 connects the switching signal output end
400；Wherein, the current limliting bleeder circuit 200, voltage or reference signal input for being inputted to switch signal input end 100
After the reference voltage progress current limliting partial pressure of end input and export；The main control chip 300, for detecting the electricity after current limliting divides
Signal is pressed, so that main control chip 300 is detected through treated the voltage signal of current limliting bleeder circuit 200, realizes that judgement is known
It Chu not switching signal high level, low level, hanging three kinds of states.The utility model solves the detection of automobile upper switch detection circuit
High level signal and low level signal, there are can not detect letter in time when vehicle-mounted product is in the abnormal operating states such as short circuit
Number the case where, automobile, which works on, will lead to the damage of vehicle-mounted product.The utility model improves the peace of automobile mounted product
Quan Xing.
In one embodiment, the three-state input detection circuit of the car switch signal further includes the second diode D2, institute
The cathode for stating the second diode D2 is connected to the first end of the switch signal input end 100 and the current limliting bleeder circuit 200
Between, the plus earth of the second diode D2.It is understood that the second diode D2 can be two-way transient supression two
The power supply disturbance for filtering out car switch signal may be implemented in pole pipe, realizes the tri-state input of effective protection car switch signal
The back-end circuit of detection circuit.
In one embodiment, the three-state input detection circuit of the car switch signal further includes 3rd resistor R3 and third
Diode D3, the 3rd resistor R3 first end are separately connected the cathode and the current limliting bleeder circuit of the second diode D2
200 first end, the second end of the 3rd resistor R3 connect the cathode of the third diode D3, the third diode D3
Anode connection reference voltage.
In one embodiment, the three-state input detection circuit of the car switch signal further includes first capacitor C1, described
The first end of first capacitor C1 be separately connected the second end of the current limliting bleeder circuit 200, the first diode D1 first
The second end of end and the switching signal output end 400, the first capacitor C1 is grounded.So that switch signal input end
The voltage signal or reference voltage signal of 100 inputs are output to switching signal output end after the processing of current limliting bleeder circuit 200
400 voltage signal is trembled processing out, realizes the steady output of car switch signal.
The utility model also proposes that a kind of automobile, the automobile include automotive control system test side, vehicle microcomputer control
The three-state input detection circuit of device and car switch signal as described above, the switch signal input end 100 and the control
The connection of system detection end, the output end of the switching signal are connect with the microcomputerized controller.The tri-state of the car switch signal
The specific structure of input detecting circuit is referring to above-described embodiment, since automobile uses whole technical sides of above-mentioned all embodiments
Case, therefore at least all beneficial effects brought by the technical solution with above-described embodiment, this is no longer going to repeat them.
The foregoing is merely the alternative embodiments of the utility model, and therefore it does not limit the scope of the patent of the utility model,
It is all under the inventive concept of the utility model, equivalent structure made based on the specification and figures of the utility model becomes
It changes, or directly/be used in other related technical areas indirectly and be included in the scope of patent protection of the utility model.
Claims (9)
1. a kind of three-state input detection circuit of car switch signal, which is characterized in that the tri-state of the car switch signal is defeated
Entering detection circuit includes switch signal input end, power supply, current limliting bleeder circuit, main control chip and switching signal output end, described
Switch signal input end is connect with the first end of the current limliting bleeder circuit, the second end of the current limliting bleeder circuit respectively with institute
The output end for stating power supply and the switching signal is separately connected, and the test side of the main control chip connects the switching signal output
End；Wherein,
The current limliting bleeder circuit, the reference electricity of voltage or power supply output for being inputted to the switch signal input end
After pressure progress current limliting partial pressure and export；
The main control chip, for detecting the voltage signal after current limliting divides, to identify the switch signal input end input
Voltage be high level, low level or vacant state.
2. the three-state input detection circuit of car switch signal as described in claim 1, which is characterized in that the power supply output
The value of reference voltage be 5V, the high level of switch signal input end input is 12V or 24V, the switching signal input
The low level of end input is 0V.
3. the three-state input detection circuit of car switch signal as described in claim 1, which is characterized in that the current limliting partial pressure
Circuit includes first resistor and second resistance, and the first end of the first resistor is the first end of the current limliting bleeder circuit, institute
The second end for stating first resistor is connect with the first end of the second resistance, and the second end of the first resistor and described second
The common end of the first end of resistance is the second end of the current limliting bleeder circuit, the second end ground connection of the second resistance.
4. the three-state input detection circuit of car switch signal as described in claim 1, which is characterized in that the main control chip
Including ADC detection circuit, for detecting through current limliting bleeder circuit treated voltage signal.
5. the three-state input detection circuit of car switch signal as described in claim 1, which is characterized in that the vehicle switch
The three-state input detection circuit of signal further includes first diode, and the first end of the first diode is connected to the current limliting point
Between the second end of volt circuit and the output end of the switching signal, the second end of the first diode is grounded.
6. the three-state input detection circuit of car switch signal as described in claim 1, which is characterized in that the vehicle switch
The three-state input detection circuit of signal further includes the second diode, and the cathode of second diode is connected to the switching signal
Between input terminal and the first end of the current limliting bleeder circuit, the plus earth of second diode.
7. the three-state input detection circuit of car switch signal as claimed in claim 6, which is characterized in that the vehicle switch
The three-state input detection circuit of signal further includes 3rd resistor and third diode, and the 3rd resistor first end is separately connected institute
The cathode of the second diode and the first end of the current limliting bleeder circuit are stated, the second end of the 3rd resistor connects the third
The cathode of diode, the anode connection reference voltage of the third diode.
8. the three-state input detection circuit of car switch signal as claimed in claim 5, which is characterized in that the vehicle switch
The three-state input detection circuit of signal further includes first capacitor, and the first end of the first capacitor is separately connected the current limliting partial pressure
The second end of circuit, the first end of the first diode and the switching signal output end, the second end of the first capacitor
Ground connection.
9. a kind of automobile, which is characterized in that the automobile includes automotive control system test side, vehicle microcomputer controller and such as weighs
Benefit requires the three-state input detection circuit of the described in any item car switch signals of 1-8, the switch signal input end with it is described
The connection of control system test side, the output end of the switching signal are connect with the microcomputerized controller.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920243171.5U CN209472611U (en) | 2019-02-25 | 2019-02-25 | The three-state input detection circuit and automobile of car switch signal |
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| CN201920243171.5U CN209472611U (en) | 2019-02-25 | 2019-02-25 | The three-state input detection circuit and automobile of car switch signal |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111123159A (en) * | 2019-12-12 | 2020-05-08 | 珠海博杰电子股份有限公司 | Automatic test system for SA address signals |
| CN111830867A (en) * | 2020-06-28 | 2020-10-27 | 东风电驱动系统有限公司 | Three-state switch signal acquisition circuit and method |
| CN113238545A (en) * | 2021-04-30 | 2021-08-10 | 珠海格力电器股份有限公司 | Vehicle control unit activation signal detection device, vehicle control unit and vehicle |
| TWI796241B (en) * | 2021-11-19 | 2023-03-11 | 立錡科技股份有限公司 | State detection circuit for detecting tri-state and state detection method thereof |
-
2019
- 2019-02-25 CN CN201920243171.5U patent/CN209472611U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111123159A (en) * | 2019-12-12 | 2020-05-08 | 珠海博杰电子股份有限公司 | Automatic test system for SA address signals |
| CN111830867A (en) * | 2020-06-28 | 2020-10-27 | 东风电驱动系统有限公司 | Three-state switch signal acquisition circuit and method |
| CN113238545A (en) * | 2021-04-30 | 2021-08-10 | 珠海格力电器股份有限公司 | Vehicle control unit activation signal detection device, vehicle control unit and vehicle |
| CN113238545B (en) * | 2021-04-30 | 2022-12-20 | 珠海格力电器股份有限公司 | Vehicle control unit activation signal detection device, vehicle control unit and vehicle |
| TWI796241B (en) * | 2021-11-19 | 2023-03-11 | 立錡科技股份有限公司 | State detection circuit for detecting tri-state and state detection method thereof |
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