CN102749489A - Signal sampling device and method - Google Patents
Signal sampling device and method Download PDFInfo
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- CN102749489A CN102749489A CN2011100992361A CN201110099236A CN102749489A CN 102749489 A CN102749489 A CN 102749489A CN 2011100992361 A CN2011100992361 A CN 2011100992361A CN 201110099236 A CN201110099236 A CN 201110099236A CN 102749489 A CN102749489 A CN 102749489A
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Abstract
The invention relates to a signal sampling device and a method. The signal sampling device comprises a central processing unit, an input interface module and an output interface module. The input interface module and the output interface module are respectively connected with the central processing unit; the input interface module comprises a first signal input circuit and a second signal input circuit, the first signal input circuit is used for inputting original signals into the central processing unit, the second signal input circuit is used for amplifying the original signals and inputting amplified signals to the central processing unit; and the central processing unit is used for respectively sampling the original signals and the amplified signals and outputting results of sampling of the original signals through the output interface module when the current value of the original signals is higher than the preset threshold value, or outputting results of sampling of the amplified signals through the output interface module when the current value of the original signals is lower than the preset threshold value. When the original signals are large signals or small signals, the authenticity of sampled signals can be better ensured, that is, the signal sampling accuracy is improved within a wider range.
Description
Technical field
The present invention relates to electric system or other need carry out signal sampling Treatment Technology field, particularly relate to a kind of signal sampling device and method.
Background technology
In electric system, the maximum protection electric current of electric relay protection equipment is at least 20 times by protection equipment rated current, and the sampled signal electric current of input electric relay protection equipment possibly change in 0-20 scope doubly in the practical power systems.Electric relay protection equipment is usually according to the working current in the sampled signal counting circuit, and determines whether to carry out relay protection according to result of calculation.It is thus clear that the authenticity of sampled signal will directly influence the result of calculation of relay protection; If the sampled signal distortion will cause electric relay protection equipment malfunction or tripping, therefore, to the processing of sampled signal just seem particularly important.
One of important indicator of weighing the sampled signal authenticity is a signal to noise ratio (S/N ratio).If the original signal of input electric relay protection product is a large-signal, then the signal to noise ratio (S/N ratio) of this original signal is bigger, and the authenticity of sampled signal is better, and the signals sampling precision is higher; Otherwise if the original signal of input electric relay protection product is a small-signal, then the signal to noise ratio (S/N ratio) of this original signal is less, and the authenticity of sampled signal is relatively poor.When the original signal of input electric relay protection product is small-signal; Prior art adopts the noise in the software algorithm filtering original signal usually; But in the time of sampling software algorithm filtering noise also filtering useful signal, signals sampling precision when having reduced the small-signal input.
Can know that through above-mentioned analysis though prior art can better guarantee the sampling precision of large-signal, the small-signal sampling precision is relatively poor, thereby can't improve the signals sampling precision in the range ability of broad.
Summary of the invention
The present invention provides a kind of signal sampling device and method, improves the signals sampling precision in order to the range ability at broad.
The invention provides a kind of signal sampling device, comprising:
CPU and the input interface module and the output interface module that are connected with said CPU respectively;
Said input interface module comprises first signal input circuit and secondary signal input circuit; Said first signal input circuit is used for to said CPU input original signal, and said secondary signal input circuit is used to amplify said original signal and imports amplifying signal to said CPU;
Said CPU is used for said original signal and said amplifying signal are carried out sampling processing respectively; At the current value of said original signal during greater than predetermined threshold value; Export the sampled result of said original signal through said output interface module; Otherwise, export the sampled result of said amplifying signal through said output interface module.
The present invention also provides a kind of signal sampling method, comprising:
Respectively to first signal input circuit and secondary signal input circuit input original signal;
Said first signal input circuit is imported said original signal to CPU;
Said secondary signal input circuit is imported amplifying signal to said original signal through processing and amplifying and to said CPU;
Said CPU is carried out sampling processing respectively to said original signal and said amplifying signal; At the current value of said original signal during greater than predetermined threshold value; Export the sampled result of said original signal through output interface module; Otherwise, export the sampled result of said amplifying signal through said output interface module.
Signal sampling device provided by the invention and method are divided two-way with pending original signal, and promptly first signal input circuit and secondary signal input circuit get into CPU, and wherein the secondary signal input circuit carries out processing and amplifying to original signal.CPU is to the two-way input signal, and promptly original signal and amplifying signal carry out sampling processing respectively, and according to the intensity of original signal current value, selects the sampled result of output original signal or amplifying signal.When the present invention is large-signal or small-signal in original signal, can both guarantee the authenticity of sampled signal preferably, promptly the range ability at broad has improved the signals sampling precision.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work property, can also obtain other accompanying drawing according to these accompanying drawings.
The structural representation of the signal sampling device that Fig. 1 provides for one embodiment of the invention;
The circuit diagram of the secondary signal input circuit that Fig. 2 provides for another embodiment of the present invention;
The process flow diagram of the signal sampling method that Fig. 3 provides for another embodiment of the present invention.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not paying the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
The present invention is called " large-signal " with current value greater than the original signal of predetermined threshold value, and the original signal that current value is less than or equal to predetermined threshold value is called " small-signal ".For example: suppose in the electric system that the maximum protection electric current of part electric relay protection equipment secondary side is 100A, then can be in actual application with 1/20 of maximum protection electric current, promptly 5A is preset as threshold value.When the current value of the original signal of input CPU (CentralProcessing Unit, be called for short CPU) during greater than 5A, this original signal is large-signal; When the current value of the original signal of importing CPU was less than or equal to 5A, this original signal was small-signal.Need to prove that the maximum protection electric current that not is all electric relay protection equipment secondary sides is 100A, is merely example here and describes, and should not be construed as the restriction of technical spirit of the present invention.
The structural representation of the signal sampling device that Fig. 1 provides for one embodiment of the invention.As shown in Figure 1, the signal sampling device that present embodiment provides comprises: input interface module 1, CPU 2 and output interface module 3, input interface module 1 is connected with CPU 2 respectively with output interface module 3.
Wherein, input interface module 1 comprises first signal input circuit 11 and secondary signal input circuit 12.When signal sampling device was in running order, the input end of the input end of first signal input circuit 11 and secondary signal input circuit 12 was imported original signal respectively.Wherein, the output terminal of first signal input circuit 11 is to CPU 2 input original signals; Secondary signal input circuit 12 carries out processing and amplifying to the original signal of its input end input and obtains amplifying signal, exports amplifying signals through its output terminal to CPU 2.
CPU 2 is used to receive the original signal of first signal input circuit, 11 inputs and the amplifying signal of secondary signal input circuit 12 inputs, and original signal and amplifying signal that these two circuit are imported respectively carry out sampling processing respectively; The current value of judging original signal when CPU is during greater than predetermined threshold value, through the sampled result of output interface module 3 output original signals, otherwise, through the sampled result of output interface module 3 output amplifying signals.Concrete; CPU 2 judges that at first whether the current value of the original signal that first signal input circuit 11 is imported is greater than predetermined threshold value; If the current value of original signal is greater than predetermined threshold value; Explain that original signal is a large-signal, CPU 2 is through the sampled result of output interface module 3 output original signals.If the current value of original signal is less than or equal to predetermined threshold value, explain that original signal is a small-signal, CPU is confirmed the sampled result of amplifying signal more near actual value, through the sampled result of output interface module 3 output amplifying signals.
Output interface module 3 is used for to external unit, like the sampled result of electric relay protection equipment output original signal or the sampled result of amplifying signal, for external unit, moves according to sampled result like electric relay protection equipment.
Next it is following to improve the realization mechanism analysis of signal sampling precision in the range ability of broad to the present invention:
The present invention divides two-way input CPU with pending original signal, and one the tunnel is original signal, and another road is the amplifying signal of original signal.CPU judges that according to the current value of original signal original signal is large-signal or small-signal, and selects the sampled result of output original signal or the sampled result of amplifying signal according to judged result.
When the useful signal in the original signal was large-signal, the sampled result of the higher and original signal of signal to noise ratio (S/N ratio) and the sampled result of amplifying signal were basic identical.And original signal is not passed through processing and amplifying, and its value more approaches actual value, so the sampled result of CPU selection output original signal, helps guaranteeing the signals sampling precision.
When the useful signal in the original signal is small-signal; Signal to noise ratio (S/N ratio) is lower, and the sampled result degree of distortion of original signal is bigger, if the sampled result of CPU selection output this moment original signal; The external unit regular event be possibly influence, as electric relay protection equipment malfunction or tripping caused; And amplifying signal is the compensated input signal to original signal, thereby has improved signal to noise ratio (S/N ratio), and CPU selects the sampled result of output amplifying signal can improve sampling precision, helps the regular event of external unit such as electric relay protection equipment.Therefore; The present embodiment CPU is according to the strength of current of original signal; Select the sampled result of output original signal or amplifying signal, that is: select the sampled result of output original signal when original signal during for large-signal, when original signal is selected the sampled result of output amplifying signal during for small-signal; Thereby make signal sampling device in the range ability of broad, improved the precision of signal sampling like the scope of 0-100A.
Can know through above-mentioned analysis; The signal sampling device that present embodiment provides divides two-way with pending original signal; Promptly first signal input circuit and secondary signal input circuit get into CPU, and wherein the secondary signal input circuit carries out processing and amplifying to original signal.CPU is to the two-way input signal; Be that original signal and amplifying signal carry out sampling processing respectively; And, select the sampled result of output original signal or amplifying signal, thereby when original signal is large-signal or small-signal according to the intensity of original signal current value; Can both guarantee the authenticity of sampled signal preferably, promptly the range ability at broad has improved the signals sampling precision.
On the basis of technique scheme, optional, the secondary signal input circuit can comprise signal amplification circuit and clamping circuit.Signal amplification circuit is used to amplify the original signal of its input end input, and its output terminal is exported amplifying signal through clamping circuit to CPU.Clamping circuit is connected with the output terminal of signal amplification circuit, is used for the magnitude of voltage of signal amplification circuit to the amplifying signal of CPU output is limited in preset range.
The circuit diagram of the secondary signal input circuit that Fig. 2 provides for another embodiment of the present invention.In circuit diagram shown in Figure 2, signal amplification circuit is specially the positive amplifying circuit, and clamping circuit is specially diode clamping circuit.
Wherein, The positive amplifying circuit comprises operational amplifier 21; The normal phase input end input original signal of operational amplifier 21; Its inverting input is through the parallelly connected some ground connection (AGND) of first resistance 22 with second resistance 23, and its output terminal is connected with the CPU (not shown) through the parallelly connected point of second resistance 22 and the 3rd resistance 24 and through clamping circuit.In this positive amplifying circuit, the concrete model of operational amplifier can be selected according to actual needs, and the enlargement factor of the original signal of its input equals the resistance value ratio of second resistance 23 and first resistance 22.
Diode clamping circuit comprises two diodes of reverse parallel connection, i.e. first diode 25 of reverse parallel connection and second diode 26.The input end grounding of first diode 25, the output termination direct current high level AD_DC of second diode 26.At this diode clamping circuit; Can the output voltage of positive amplifying circuit be limited between the 0--AD_DC; For example: the voltage of supposing direct current high level AD_DC is 3V, and then diode clamping circuit is limited in 0-3V with the output voltage of positive amplifying circuit, and promptly the clamp voltage scope is: 0-3V.The benefit of so handling is, can be according to the clamp voltage scope of the load-bearing capacity design diode clamping circuit of CPU, and the load-bearing capacity of effectively avoiding output voltage because of the positive amplifying circuit to exceed CPU is damaged CPU.
The secondary signal input circuit that present embodiment provides through adjusting the resistance value ratio of first resistance and second resistance, can be controlled the enlargement ratio of original signal flexibly; Through the clamp voltage scope of adjustment diode clamping circuit, can effectively avoid the output voltage of positive amplifying circuit to exceed the load-bearing capacity of CPU, thereby protect CPU.It is thus clear that, the secondary signal input circuit that present embodiment provides to have a circuit structure simple, realize advantages such as convenient.
It will be appreciated by those skilled in the art that: in the technique scheme, the positive amplifying circuit is merely a kind of embodiment of signal amplification circuit, and diode clamping circuit is merely a kind of embodiment of clamping circuit; The amplifying circuit of other forms also may be used in the signal sampling device realizing the enlarging function of original signal like see-saw circuit; The clamping circuit of other forms also may be used on realizing in the signal sampling device function of restricting signal amplifying circuit output voltage; Repeat no more at this.
The process flow diagram of the signal sampling method that Fig. 3 provides for another embodiment of the present invention.The subject of implementation of present embodiment signal sampling method can be signal sampling device shown in Figure 1.Concrete, as shown in figures 1 and 3, the present embodiment signal sampling method comprises:
Step 31: respectively to first signal input circuit and secondary signal input circuit input original signal.
This step will treat that the original signal of sampling processing divides two-way input, promptly import original signal respectively to the input end of first signal input circuit and the output terminal of secondary signal input circuit respectively.
Step 32: first signal input circuit is imported original signal to CPU.
The output terminal of first signal input circuit is connected with CPU, to CPU input original signal.
Step 33: the secondary signal input circuit is imported amplifying signal to original signal through processing and amplifying and to CPU.
The concrete structure of secondary signal input circuit is unrestricted, as comprising signal amplification circuit and clamping circuit.Under this situation, this step is amplified the original signal that its input end is imported by signal amplification circuit, and its output terminal is exported amplifying signal through clamping circuit to said CPU; And clamping circuit is limited in preset range with the magnitude of voltage of signal amplification circuit to the amplifying signal of CPU output, thereby avoids the output voltage of signal amplification circuit to exceed the load-bearing capacity of CPU, helps protecting CPU.Optional, the secondary signal input circuit can adopt circuit structure as shown in Figure 2, and it realizes that original signal is amplified and the realization mechanism of the voltage clamp of amplifying signal, can repeat no more at this referring to the literature record of the corresponding embodiment of preceding text Fig. 2.
Above-mentioned steps 32 and step 33 do not have the restriction of sequential relationship, can carry out synchronously like step 32 and step 33 etc.
Step 34: CPU is carried out sampling processing respectively to original signal and amplifying signal.
This step is unrestricted to the signals sampling Processing Algorithm.Practical experience shows, if the current value of original signal greater than predetermined threshold value, promptly original signal is under the situation of large-signal, it is basic identical to adopt Same Way that original signal and amplifying signal are carried out the sampled result that sampling processing obtains; If the current value of original signal is less than or equal to predetermined threshold value, promptly original signal is under the situation of small-signal, adopts Same Way that original signal and amplifying signal are carried out the sampled result that sampling processing obtains and differs greatly.CPU is carried out sampling processing respectively to the original signal of first signal input circuit input and the amplifying signal of secondary signal input circuit input.
Step 35: CPU judges that whether the current value of the original signal that first signal input circuit is imported is greater than predetermined threshold value, if then execution in step 36; Otherwise, execution in step 37.
In the electric system, the maximum protection electric current of part electric relay protection equipment is 100A, can be in actual application with 1/20 of maximum protection electric current, and promptly 5A is preset as threshold value.CPU is confirmed the current value of the original signal of first signal input circuit input; And judge that whether this current value is greater than predetermined threshold value; As whether judge this current value, and select the sampled result of output original signal or the sampled result of output amplifying signal according to judged result greater than 5A.
Step 36: CPU is through the sampled result of output interface module output original signal, and output interface module is to the sampled result of external unit output original signal; Process ends.
If CPU is determined the current value of original signal greater than predetermined threshold value; Like the current value of original signal greater than 5A; Explain that then original signal is a large-signal; CPU with the original signal of first signal input circuit input as useful signal, through output interface module to external unit, like the sampled result of external power relay protection device output original signal.
Step 37: CPU is through the sampled result of output interface module output amplifying signal, and output interface module is to the sampled result of external unit output original signal; Process ends.
If determining the current value of original signal, CPU is less than or equal to predetermined threshold value; Current value like original signal is less than or equal to 5A; Explain that then original signal is a small-signal; CPU with the amplifying signal of secondary signal input circuit input as useful signal, through output interface module to external unit, like the sampled result of external power relay protection device output original signal.
The signal sampling method that present embodiment provides divides two-way with pending original signal, and promptly first signal input circuit and secondary signal input circuit get into CPU, and wherein the secondary signal input circuit carries out processing and amplifying to original signal.CPU is to the two-way input signal; Be that original signal and amplifying signal carry out sampling processing respectively; And, select the sampled result of output original signal or amplifying signal according to the intensity of original signal current value, that is: select the sampled result of output original signal during for large-signal when original signal; When original signal is selected the sampled result of output amplifying signal during for small-signal; Thereby guaranteed no matter original signal is large-signal or small-signal, can both guarantee the authenticity of sampled signal preferably, and promptly the range ability at broad has improved the signals sampling precision.
One of ordinary skill in the art will appreciate that: the above-mentioned flow process of present embodiment is merely the example of the sampling processing flow process of an original signal, in actual application, and can be through carrying out above-mentioned flow process repeatedly to realize the continuous sampling of signal.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be accomplished through the relevant hardware of programmed instruction; Aforesaid program can be stored in the computer read/write memory medium; This program the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
What should explain at last is: above embodiment is only in order to explaining technical scheme of the present invention, but not to its restriction; Although with reference to previous embodiment the present invention has been carried out detailed explanation, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that previous embodiment is put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these are revised or replacement, do not make the spirit and the scope of the essence disengaging embodiment of the invention technical scheme of relevant art scheme.
Claims (7)
1. a signal sampling device is characterized in that, comprising:
CPU and the input interface module and the output interface module that are connected with said CPU respectively;
Said input interface module comprises first signal input circuit and secondary signal input circuit; Said first signal input circuit is used for to said CPU input original signal, and said secondary signal input circuit is used to amplify said original signal and imports amplifying signal to said CPU;
Said CPU is used for said original signal and said amplifying signal are carried out sampling processing respectively; At the current value of said original signal during greater than predetermined threshold value; Export the sampled result of said original signal through said output interface module; Otherwise, export the sampled result of said amplifying signal through said output interface module.
2. device according to claim 1 is characterized in that,
Said secondary signal input circuit comprises signal amplification circuit and clamping circuit;
Said signal amplification circuit is used to amplify the said original signal of its input end input, and its output terminal is exported said amplifying signal through said clamping circuit to said CPU;
Said clamping circuit is connected with the output terminal of said signal amplification circuit, is used for the magnitude of voltage of said signal amplification circuit to the said amplifying signal of said CPU output is limited in preset range.
3. device according to claim 2 is characterized in that, said signal amplification circuit is positive amplifying circuit or see-saw circuit.
4. device according to claim 3 is characterized in that, said positive amplifying circuit comprises operational amplifier; The normal phase input end of said operational amplifier is imported said original signal; Its inverting input is through the parallelly connected some ground connection of first resistance with second resistance, and its output terminal is connected with said CPU through the parallelly connected point of second resistance and the 3rd resistance and through said clamping circuit.
5. device according to claim 4 is characterized in that, said clamping circuit comprises two diodes of reverse parallel connection, and the parallel connection point of said two diodes is connected with said the 3rd resistance.
6. a signal sampling method is characterized in that, comprising:
Respectively to first signal input circuit and secondary signal input circuit input original signal;
Said first signal input circuit is imported said original signal to CPU;
Said secondary signal input circuit is imported amplifying signal to said original signal through processing and amplifying and to said CPU;
Said CPU is carried out sampling processing respectively to said original signal and said amplifying signal; At the current value of said original signal during greater than predetermined threshold value; Export the sampled result of said original signal through output interface module; Otherwise, export the sampled result of said amplifying signal through said output interface module.
7. method according to claim 6 is characterized in that,
Said secondary signal input circuit comprises signal amplification circuit and clamping circuit;
Said secondary signal input circuit, comprising through processing and amplifying and to said CPU input amplifying signal said original signal:
Said signal amplification circuit amplifies the said original signal of its input end input, and its output terminal is exported said amplifying signal through said clamping circuit to said CPU;
Said clamping circuit is limited in preset range with the magnitude of voltage of said signal amplification circuit to the said amplifying signal of said CPU output.
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Cited By (1)
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| CN109901550A (en) * | 2019-01-30 | 2019-06-18 | 深圳市赛格车圣科技有限公司 | Car body control module switching quantity detection circuit, car body control module and automobile |
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Inventor after: Zhao Changbing Inventor after: Li Huiyong Inventor after: Zhang Jian Inventor after: Gao Longji Inventor after: Chang Hongqi Inventor after: Jiang Yuhong Inventor after: Li Zengli Inventor after: Li Hongshuo Inventor after: Fang Yin Inventor before: Fang Yin Inventor before: Gao Longji Inventor before: Chang Hongqi Inventor before: Jiang Yuhong |
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Application publication date: 20121024 |