CN104467854A - Port state acquisition circuit and method - Google Patents
Port state acquisition circuit and method Download PDFInfo
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- CN104467854A CN104467854A CN201510006496.8A CN201510006496A CN104467854A CN 104467854 A CN104467854 A CN 104467854A CN 201510006496 A CN201510006496 A CN 201510006496A CN 104467854 A CN104467854 A CN 104467854A
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Abstract
The invention discloses a port state acquisition circuit and method. The port state acquisition circuit comprises a first resistor, a second resistor, a third resistor and an analog-to-digital converter. One end of the first resistor is connected with a port, and the other end of the first resistor is connected with a first constant voltage power source. One end of the second resistor is connected with the port, the other end of the second resistor is connected with one end of the third resistor and the analog-to-digital converter, and the other end of the third resistor is earthed. The port states comprise an earthing signal state, a suspension signal state and a power supply signal state. The analog-to-digital converter is used for acquiring voltage values of a circuit, converting the voltage values into digital signals and outputting the digital signals. Different port states correspond to different digital signal ranges. The port can be configured to be a power supply signal, a suspension signal and an earthing signal at the same time, and thus the circuit port can achieve conversion among various signals at the same time. The port states can be further accurately identified, and the voltage values of the port can be judged in actual application.
Description
Technical field
The present invention relates to a kind of port status Acquisition Circuit and method, belong to electronic circuit technology field.
Background technology
In circuit, generally can there is two states in port: continuous analog signal and switching signal, and switching signal comprises three kinds: power supply signal, unsettled signal and earth signal.In the circuit of prior art, general port can adopt the combination of any two kinds of signals, and is detected by port status detection technique and judge the port status of two kinds of signals.Along with the lifting of electronic technology level, in actual applications, require that port has three kinds or more signal gradually simultaneously, and adopt current known circuit to be difficult to realize.And when port can realize the conversion of three kinds of signals, in practical application, be also difficult to distinguish that port adopts is which kind of signal.Therefore, develop a kind of port and can realize multi-signal state and mutually change, and easily can identify the circuit of port virtual condition, become one of the important topic in electronic circuit technology field.
Summary of the invention
For at least one of solving the problems of the technologies described above, the object of the present invention is to provide a kind of port status Acquisition Circuit and port status acquisition method, the port of described circuit can realize multi-signal state and mutually change, and easily can identify the virtual condition of port.
One of for achieving the above object, an embodiment of the present invention provides a kind of port status Acquisition Circuit, described circuit comprises the first resistance, the second resistance, the 3rd resistance and A/D converter, one end of described first resistance is connected with described port and its other end is connected with the first constant voltage source, one end of described second resistance is connected with described port and its other end is connected with one end of described 3rd resistance, described A/D converter, the other end ground connection of described 3rd resistance;
Wherein, described port status comprises ground signalling state, unsettled signal condition and power supply signal state, described A/D converter is for gathering the magnitude of voltage of described circuit and being converted to digital signal output, and the described range digital that different described port statuss is corresponding is different.
As a further improvement on the present invention, the voltage of described first constant voltage source is+5V.
As a further improvement on the present invention, the size of described first resistance, described second resistance and described 3rd resistance is respectively 10K Ω, 100K Ω, 20K Ω.
As a further improvement on the present invention, described circuit comprises judge module, described judge module is connected with described A/D converter, the described digital signal that described judge module exports for receiving described A/D converter, and described judge module judges described port status according to described digital signal.
As a further improvement on the present invention, described judge module is provided with the first numerical value and second value, and described first numerical value is not more than described second value, wherein,
When described digital signal is less than described first numerical value, described judge module judges that described port status is ground signalling state;
When described digital signal is in described first numerical value to the scope of described second value definition, described judge module judges that described port status is unsettled signal condition;
When described digital signal is greater than described second value, described judge module judges that described port status is power supply signal state.
One of for achieving the above object, an embodiment of the present invention additionally provides a kind of port status acquisition method, said method comprising the steps of:
A kind of port status Acquisition Circuit is provided, described circuit comprises the first resistance, the second resistance, the 3rd resistance and A/D converter, one end of described first resistance is connected with described port and its other end is connected with the first constant voltage source, one end of described second resistance is connected with described port and its other end is connected with one end of described 3rd resistance, described A/D converter, the other end ground connection of described 3rd resistance;
Arranging described port status is ground signalling state, unsettled signal condition or power supply signal state;
Gather the magnitude of voltage of described circuit;
Described magnitude of voltage is converted to digital signal;
Export described digital signal;
According to described digital signal, judge described port status.
As a further improvement on the present invention, the voltage of described first constant voltage source is+5V.
As a further improvement on the present invention, the size of described first resistance, described second resistance and described 3rd resistance is respectively 10K Ω, 100K Ω, 20K Ω.
As a further improvement on the present invention, described step " exports described digital signal " and specifically comprises:
Export described digital signal to the judge module be connected with described A/D converter.
As a further improvement on the present invention, step " according to described digital signal, judges described port status " and specifically comprises:
In described judge module, store the first numerical value and second value, described first numerical value is not more than described second value;
According to the described digital signal received, judge described port status;
When described digital signal is less than described first numerical value, judge that described port status is ground signalling state;
When described digital signal is in described first numerical value to the scope of described second value definition, judge that described port status is unsettled signal condition;
When described digital signal is greater than described second value, judge that described port status is power supply signal state.
Compared with prior art, the present invention has following Advantageous Effects: port can be configured to power supply signal, unsettled signal, earth signal simultaneously, makes the conversion that circuit port realizes between multi-signal simultaneously; Also in actual applications, can accurately identify the state of port, and during port input continuous analog signal, judge the magnitude of voltage of port.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the port status Acquisition Circuit of an embodiment of the present invention.
Embodiment
Describe the present invention below with reference to embodiment shown in the drawings.But these execution modes do not limit the present invention, the structure that those of ordinary skill in the art makes according to these execution modes, method or conversion functionally are all included in protection scope of the present invention.
It is the circuit diagram of the port status Acquisition Circuit of an embodiment of the present invention referring to Fig. 1, Fig. 1.Described circuit is used for gathering the state of port IN, and described circuit comprises the first resistance R1, the second resistance R2, the 3rd resistance R3 and A/D converter AD.One end of first resistance R1 is connected with port IN, and the other end of the first resistance R1 is connected with the first constant voltage source U1; One end of second resistance R2 is connected with port IN, and the other end of the second resistance R2 is connected with the 3rd resistance R3 one end, A/D converter AD; The other end ground connection of the 3rd resistance R3.
Described A/D converter AD is for gathering the magnitude of voltage of described circuit and output digit signals.Wherein, when described port status is power supply signal state, that is during port IN input power signal, the input voltage of A/D converter AD is for the 3rd resistance R3 in the loop that forms at the second resistance R2 and the 3rd resistance R3 is to the dividing potential drop of the power supply signal of input; When described port status is unsettled signal condition, that is port IN is when inputting unsettled signal, the input voltage of A/D converter AD is for the 3rd resistance R3 in the loop that forms at the first resistance R1, the second resistance R2 and the 3rd resistance R3 is to the dividing potential drop of the first constant voltage source U1; When described port status is ground signalling state, that is when port IN inputs earth signal, the input voltage of A/D converter AD is for the 3rd resistance R3 in the loop that forms at the second resistance R2 and the 3rd resistance R3 is to the dividing potential drop of earth signal.Different described port statuss, the voltage that described A/D converter AD collects is different, the magnitude of voltage collected is converted to digital signal by described A/D converter AD, namely exported digital signal is different, the range digital that port status described in each is corresponding certain, namely described range digital corresponding under different described port statuss is different, thus, the port status Acquisition Circuit of an embodiment of the present invention, the configuration of port multi-signal can be realized, described port status can be configured to unsettled signal, power supply signal and ground signalling three kinds of states, and can easily identify described port status.
Concrete, described circuit also comprises judge module, described judge module is connected with described A/D converter AD, and can export corresponding digital signal X after described A/D converter AD collects voltage to described judge module, described judge module receives described digital signal X and judges.According to actual needs, described judge module is provided with the first numerical value and second value, and described first numerical value is not more than described second value.
In the present embodiment, the first constant voltage source U1 voltage is+5V, and the size of the first resistance R1, the second resistance R2 and the 3rd resistance R3 is respectively 10K Ω, 100K Ω, 20K Ω.When port IN input power signal, the input voltage U of A/D converter AD
aDfor the 3rd resistance R3 in the loop that forms at the second resistance R2 and the 3rd resistance R3 is to power supply signal U
iNdividing potential drop, i.e. U
aD=U
iN* (R3/ (R3+R2)); When port IN inputs unsettled signal, the input voltage U of A/D converter AD
aDfor the 3rd resistance R3 in the loop that forms at the first resistance R1, the second resistance R2 and the 3rd resistance R3 is to the dividing potential drop of the first constant voltage source U1, i.e. U
aD=U1* (R3/ (R1+R2+R3)), and the voltage U of port IN
iNfor the 3rd resistance R3 and the second resistance R2 in the loop that forms at the first resistance R1, the second resistance R2 and the 3rd resistance R3 is to the dividing potential drop of the first constant voltage source U1, i.e. U
iN=U1* ((R3+R2)/(R1+R2+R3)), then the input voltage U of A/D converter AD
aDwith the voltage U of port IN
iNpass be: U
aD=U
iN* (R3/ (R3+R2)); When port IN inputs earth signal, the input voltage U of A/D converter AD
aDfor the 3rd resistance R3 in the loop that forms at the second resistance R2 and the 3rd resistance R3 is to the dividing potential drop of earth signal, and the voltage U of now earth signal voltage also i.e. port IN
iN, then U
aD=U
iN* (R3/ (R3+R2)).
Consider in practical application, earth signal voltage is not absolute 0V, but has certain error range, in a concrete example, and the input voltage U of port IN
iNpower supply signal is defined as, according to the input voltage U of port IN when being defined as unsettled signal, 5 ~ 15V when being defined as earth signal, 4 ~ 5V when being 0 ~ 4V
iNwith the input voltage U of A/D converter AD
aDrelation, described first numerical value is set to 0.667V, and described second value is set to 0.833V.As the digital signal X<0.667V that described judge module receives, then judge that described port status is ground signalling state; As the digital signal X>0.833V that described judge module receives, then judge that described port status is power supply signal state; When the digital signal X that described judge module receives is 0.667V≤X≤0.833V, then described port status is unsettled signal condition.Port status Acquisition Circuit of the present invention, need not change circuit form and just can detect power supply signal, earth signal or unsettled signal, adaptability is very good.
What deserves to be explained is; the value of all parts in this specification does not limit the protection range of the application; as the magnitude of voltage of the first constant voltage source U1, the first resistance R1, the second resistance R2, the 3rd resistance R3, as described in the first numerical value, as described in second value etc.; in actual applications; all can set corresponding numerical value according to specifically needing, with the demand of satisfied different electronic circuit.Below do not depart from the skill of the present invention equivalent implementations done of spirit or change and all should be included within protection scope of the present invention.
In addition, described judge module also according to described digital signal X, can obtain the input voltage U of A/D converter AD
aD, then according to the input voltage U of above-mentioned A/D converter AD
aDwith the input voltage U of port IN
iNrelation: U
aD=U
iN* (R3/ (R3+R2)), described judge module can the input voltage U of output port IN
iN.It can thus be appreciated that when port IN continues analog signal in succession, port status Acquisition Circuit of the present invention can identify the magnitude of voltage of the continuous analog signal of port IN according to digital signal X.
In addition, in an embodiment of the present invention, additionally provide a kind of port status acquisition method, said method comprising the steps of:
A kind of port status Acquisition Circuit is provided, described circuit comprises the first resistance, the second resistance, the 3rd resistance and A/D converter, one end of described first resistance is connected with described port and its other end is connected with the first constant voltage source, one end of described second resistance is connected with described port and one end of its other end and the 3rd resistance, A/D converter are connected, the other end ground connection of described 3rd resistance;
Arranging described port status is ground signalling state, unsettled signal condition or power supply signal state;
Gather the magnitude of voltage of described circuit;
Described magnitude of voltage is converted to digital signal;
Export described digital signal;
According to described digital signal, judge described port status.
Be described in detail to described port status acquisition method below in conjunction with Fig. 1, Fig. 1 is the circuit diagram of the port status Acquisition Circuit of an embodiment of the present invention.
There is provided a kind of port status Acquisition Circuit, described circuit is used for gathering the state of port IN, and described circuit comprises the first resistance R1, the second resistance R2, the 3rd resistance R3 and A/D converter AD.One end of first resistance R1 is connected with port IN, and the other end of the first resistance R1 is connected with the first constant voltage source U1; One end of second resistance R2 is connected with port IN, and the other end of the second resistance R2 is connected with the 3rd resistance R3 one end, A/D converter AD; The other end ground connection of the 3rd resistance R3;
Arranging described port status is ground signalling state, unsettled signal condition or power supply signal state, that is port IN inputs earth signal, unsettled signal or power supply signal;
The magnitude of voltage of described circuit is gathered with A/D converter AD;
Described magnitude of voltage is converted to digital signal X;
Output digit signals X;
The magnitude of voltage that described A/D converter AD gathers is relevant with described port status, and the scope of described port status and described digital signal X is corresponding relation, then according to described digital signal X, judge described port status.
Concrete, the voltage of described first constant voltage source U1 is+5V, and the size of described first resistance R1, described second resistance R2 and described 3rd resistance R3 is respectively 10K Ω, 100K Ω, 20K Ω.In actual applications, the voltage of the first constant voltage source and the first resistance R1, the second resistance R2 and the 3rd resistance R3 also can be set to other numerical value, and its numerical values recited is not by the restriction of this explanation.
Arrange judge module, described judge module is connected with A/D converter AD, and described step " exports described digital signal " and specifically comprises: output digit signals X is to described judge module.
Step " according to described digital signal; judge described port status " specifically comprises: in described judge module, store the first numerical value and second value, in the port status Acquisition Circuit of Fig. 1, arranging the first numerical value is 0.667V, and arranging described second value is 0.833V;
After receiving described digital signal X, according to the magnitude relationship of digital signal X and described first numerical value and described second value, judge described port status.
Concrete, when port IN input power signal, the input voltage U of A/D converter AD
aDfor the 3rd resistance R3 in the loop that forms at the second resistance R2 and the 3rd resistance R3 is to power supply signal U
iNdividing potential drop: U
aD=U
iN* (R3/ (R3+R2)); When port IN inputs unsettled signal, the input voltage U of A/D converter AD
aDfor the 3rd resistance R3 in the loop that forms at the first resistance R1, the second resistance R2 and the 3rd resistance R3 is to the dividing potential drop of the first constant voltage source U1: U
aD=U1* (R3/ (R1+R2+R3)), and the voltage of port IN is for the 3rd resistance R3 and the second resistance R2 in the loop that forms at the first resistance R1, the second resistance R2 and the 3rd resistance R3 is to the dividing potential drop of the first constant voltage source U1, i.e. U
iN=U1* ((R3+R2)/(R1+R2+R3)), then the input voltage U of A/D converter AD
aDwith the voltage U of port IN
iNpass be: U
aD=U
iN* (R3/ (R3+R2)); When port IN inputs earth signal, the input voltage U of A/D converter AD
aDfor the 3rd resistance R3 in the loop that forms at the second resistance R2 and the 3rd resistance R3 is to the dividing potential drop of earth signal, and the voltage U of now earth signal voltage also i.e. port IN
iN, then U
aD=U
iN* (R3/ (R3+R2)).Consider in practical application, earth signal voltage is not absolute 0V, but has certain error range, in a concrete example, and the input voltage U of port IN
iNpower supply signal is defined as, then the range digital that port status described in each is corresponding certain when being defined as unsettled signal, 5 ~ 15V when being defined as earth signal, 4 ~ 5V when being 0 ~ 4V.According to the input voltage U of port IN
iNwith the input voltage U of A/D converter AD
aDrelation, as the digital signal X<0.667V that described judge module receives, then judge that described port status is ground signalling state; As the digital signal X>0.833V that described judge module receives, then judge that described port status is power supply signal state; When the digital signal X that described judge module receives is 0.667V≤X≤0.833V, then described port status is unsettled signal condition.Port status acquisition method of the present invention, need not change circuit form and just can identify power supply signal, earth signal or unsettled signal, adaptability is very good.
Compared with prior art, the present invention has following Advantageous Effects: port can be configured to power supply signal, unsettled signal, earth signal simultaneously, makes the conversion that circuit port realizes between multi-signal simultaneously; Also in actual applications, can accurately identify the state of port, and during port input continuous analog signal, judge the magnitude of voltage of port.
Be to be understood that, although this specification is described according to execution mode, but not each execution mode only comprises an independently technical scheme, this narrating mode of specification is only for clarity sake, those skilled in the art should by specification integrally, technical scheme in each execution mode also through appropriately combined, can form other execution modes that it will be appreciated by those skilled in the art that.
Detailed description listed is above only illustrating for feasibility execution mode of the present invention; they are also not used to limit the scope of the invention, all do not depart from the skill of the present invention equivalent implementations done of spirit or change all should be included within protection scope of the present invention.
Claims (10)
1. a port status Acquisition Circuit, it is characterized in that, described circuit comprises the first resistance, the second resistance, the 3rd resistance and A/D converter, one end of described first resistance is connected with described port and its other end is connected with the first constant voltage source, one end of described second resistance is connected with described port and its other end is connected with one end of described 3rd resistance, described A/D converter, the other end ground connection of described 3rd resistance;
Wherein, described port status comprises ground signalling state, unsettled signal condition and power supply signal state, described A/D converter is for gathering the magnitude of voltage of described circuit and being converted to digital signal output, and the described range digital that different described port statuss is corresponding is different.
2. port status Acquisition Circuit according to claim 1, is characterized in that, the voltage of described first constant voltage source is+5V.
3. port status Acquisition Circuit according to claim 1, is characterized in that, the size of described first resistance, described second resistance and described 3rd resistance is respectively 10K Ω, 100K Ω, 20K Ω.
4. port status Acquisition Circuit according to claim 1, it is characterized in that, described circuit comprises judge module, described judge module is connected with described A/D converter, the described digital signal that described judge module exports for receiving described A/D converter, and described judge module judges described port status according to described digital signal.
5. port status Acquisition Circuit according to claim 4, is characterized in that, described judge module is provided with the first numerical value and second value, and described first numerical value is not more than described second value, wherein,
When described digital signal is less than described first numerical value, described judge module judges that described port status is ground signalling state;
When described digital signal is in described first numerical value to the scope of described second value definition, described judge module judges that described port status is unsettled signal condition;
When described digital signal is greater than described second value, described judge module judges that described port status is power supply signal state.
6. a port status acquisition method, is characterized in that, said method comprising the steps of:
A kind of port status Acquisition Circuit is provided, described circuit comprises the first resistance, the second resistance, the 3rd resistance and A/D converter, one end of described first resistance is connected with described port and its other end is connected with the first constant voltage source, one end of described second resistance is connected with described port and its other end is connected with one end of described 3rd resistance, described A/D converter, the other end ground connection of described 3rd resistance;
Arranging described port status is ground signalling state, unsettled signal condition or power supply signal state;
Gather the magnitude of voltage of described circuit;
Described magnitude of voltage is converted to digital signal;
Export described digital signal;
According to described digital signal, judge described port status.
7. port status acquisition method according to claim 6, is characterized in that, the voltage of described first constant voltage source is+5V.
8. port status acquisition method according to claim 6, is characterized in that, the size of described first resistance, described second resistance and described 3rd resistance is respectively 10K Ω, 100K Ω, 20K Ω.
9. port status acquisition method according to claim 6, is characterized in that, described step " exports described digital signal " and specifically comprises:
Export described digital signal to the judge module be connected with described A/D converter.
10. port status acquisition method according to claim 9, is characterized in that, step " according to described digital signal, judges described port status " and specifically comprises:
In described judge module, store the first numerical value and second value, described first numerical value is not more than described second value;
According to the described digital signal received, judge described port status;
When described digital signal is less than described first numerical value, judge that described port status is ground signalling state;
When described digital signal is in described first numerical value to the scope of described second value definition, judge that described port status is unsettled signal condition;
When described digital signal is greater than described second value, judge that described port status is power supply signal state.
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| CN201510006496.8A CN104467854A (en) | 2015-01-07 | 2015-01-07 | Port state acquisition circuit and method |
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| CN105375695A (en) * | 2015-12-25 | 2016-03-02 | 北京新能源汽车股份有限公司 | Motor and identification device and motor controller thereof |
| CN105511362A (en) * | 2016-01-12 | 2016-04-20 | 广东芬尼克兹节能设备有限公司 | Analog quantity and switching quantity shared detection device and method |
| CN108422996A (en) * | 2018-05-10 | 2018-08-21 | 江铃汽车股份有限公司 | A kind of parking system and automatic parking control method of integrated BSD, SDG function |
| CN111060775A (en) * | 2020-01-10 | 2020-04-24 | 珠海格力电器股份有限公司 | Identification method and device for pin of needle base and air conditioner |
| 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 |
| CN115372805A (en) * | 2022-10-25 | 2022-11-22 | 苏州路之遥科技股份有限公司 | Method for determining whether external input digital signal is suspended and invalid |
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| CN108422996A (en) * | 2018-05-10 | 2018-08-21 | 江铃汽车股份有限公司 | A kind of parking system and automatic parking control method of integrated BSD, SDG function |
| CN111060775A (en) * | 2020-01-10 | 2020-04-24 | 珠海格力电器股份有限公司 | Identification method and device for pin of needle base and air conditioner |
| 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 |
| CN115372805A (en) * | 2022-10-25 | 2022-11-22 | 苏州路之遥科技股份有限公司 | Method for determining whether external input digital signal is suspended and invalid |
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