CN210690679U - High-precision current sampling circuit of servo driver system - Google Patents
High-precision current sampling circuit of servo driver system Download PDFInfo
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- CN210690679U CN210690679U CN201921294999.XU CN201921294999U CN210690679U CN 210690679 U CN210690679 U CN 210690679U CN 201921294999 U CN201921294999 U CN 201921294999U CN 210690679 U CN210690679 U CN 210690679U
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Abstract
The utility model discloses a high-precision current sampling circuit of a servo driver system, which comprises a positive signal extraction circuit, a negative signal extraction circuit, a first analog-digital conversion circuit, a second analog-digital conversion circuit and a subtraction circuit, wherein, the input end signal of the positive signal extraction circuit is a current signal, the output end signal is a positive signal component in the current signal, the input end signal of the negative signal extraction circuit is a current signal, the output end signal is the negative signal component in the current signal, the input end of the first analog-digital conversion circuit is connected with the output end signal of the positive signal extraction circuit, the output end of the first analog-digital circuit is electrically connected with the positive electrode of the subtraction circuit, the input end of the first analog-digital circuit is connected with the output end signal of the negative signal extraction circuit, the output end of the current sampling circuit is electrically connected with the negative electrode of the subtraction circuit, and the digital quantity of the current sampling signal is output through the subtraction circuit; the utility model discloses the sampling accuracy is high, and circuit device structure is with low costs moreover, is fit for the scale and popularizes and applies the implementation.
Description
Technical Field
The utility model relates to a current sampling circuit structure in servo driver field, concretely relates to high accuracy current sampling circuit of servo driver system.
Background
In current servo driver system products, the current signal is the most important input detection variable, and the detection accuracy thereof determines the control accuracy of the entire servo driver system. In the prior art, an analog-digital conversion circuit is generally adopted to detect a current signal, and analog quantity inputs of all the analog-digital conversion circuits have a fixed voltage range, and the voltage range determines the sampling precision of the analog-digital conversion circuit. When the structure is adopted for current sampling, one current signal is limited by one analog-digital conversion circuit, so that the current sampling precision is limited by the precision of the analog-digital conversion circuit, and finally the current sampling circuit of the existing servo driver cannot meet the requirement of high-precision current sampling.
Disclosure of Invention
In view of this, the utility model aims at providing a high accuracy current sampling circuit of servo driver system, the sampling accuracy is high, and circuit device structure is with low costs moreover, is fit for the scale and popularizes and applies the implementation.
The utility model adopts the technical scheme as follows:
a high-precision current sampling circuit of a servo driver system comprises a positive signal extraction circuit, a negative signal extraction circuit, a first analog-digital conversion circuit, a second analog-digital conversion circuit and a subtraction circuit, wherein, the input end signal of the positive signal extraction circuit is a current signal, the output end signal thereof is a positive signal component in the current signal, the input end signal of the negative signal extraction circuit is a current signal, the output end signal is the negative signal component in the current signal, the input end of the first analog-digital conversion circuit is connected with the output end signal of the positive signal extraction circuit, the output end of the second analog-digital circuit is electrically connected with the anode of the subtraction circuit, the input end of the second analog-digital circuit is connected with the output end signal of the negative signal extraction circuit, and the output end of the current sampling circuit is electrically connected with the cathode of the subtraction circuit, and the digital quantity of the current sampling signal is output through the subtraction circuit.
Preferably, the positive signal extraction circuit is configured to extract a positive signal component in the current signal while setting a negative signal component output in the current signal to zero.
Preferably, the negative signal extraction circuit is configured to extract a negative signal component in the current signal and convert it into a converted positive signal component by positive and negative, the converted positive signal component being an output terminal signal of the negative signal extraction circuit, and the positive signal component output in the current signal is set to zero.
Preferably, the first analog-to-digital conversion circuit performs digital quantity conversion on the positive signal component in the current signal and outputs a current positive signal digital quantity to the positive pole of the subtraction circuit.
Preferably, the second analog-to-digital conversion circuit performs digital quantity conversion on the negative signal component in the current signal and outputs a current negative signal digital quantity to the negative electrode of the subtraction circuit.
Preferably, the subtraction circuit outputs the digital quantity of the current sampling signal after subtracting the digital quantity of the current positive signal and the digital quantity of the current negative signal.
Compared with the prior art, the utility model discloses following positive technological effect has:
firstly, the current sampling precision is high: the utility model discloses creatively provide do corresponding analog-to-digital conversion to current signal's positive signal component and negative signal component respectively in current sampling circuit, through subtraction calculation back, and then can improve the current sampling precision by one time.
Secondly, the structure cost of the circuit device is low: the utility model discloses still adopt conventional analog-to-digital conversion circuit to obtain the current sampling signal of higher accuracy to need not adopt the single high accuracy analog-to-digital conversion circuit that the price is high to improve the sampling precision of electric current, consequently, the utility model discloses the advantage with low costs of circuit device structure has simultaneously.
Drawings
Fig. 1 is a high-precision current sampling circuit structure diagram of a servo driver system according to an embodiment of the present invention.
Detailed Description
The embodiment of the utility model discloses a high-precision current sampling circuit of a servo driver system, which comprises a positive signal extraction circuit, a negative signal extraction circuit, a first analog-digital conversion circuit, a second analog-digital conversion circuit and a subtraction circuit, wherein, the input end signal of the positive signal extraction circuit is a current signal, the output end signal is a positive signal component in the current signal, the input end signal of the negative signal extraction circuit is a current signal, the output end signal is the negative signal component in the current signal, the input end of the first analog-digital conversion circuit is connected with the output end signal of the positive signal extraction circuit, the output end of the first analog-digital circuit is electrically connected with the positive electrode of the subtraction circuit, the input end of the first analog-digital circuit is connected with the output end signal of the negative signal extraction circuit, and the output end of the current sampling circuit is electrically connected with the cathode of the subtraction circuit, and the digital quantity of the current sampling signal is output through the subtraction circuit.
In order to make the technical solutions in the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.
Please refer to the high-precision current sampling circuit of the servo driver system shown in fig. 1, which includes a positive signal extracting circuit 1, a negative signal extracting circuit 2, a first analog-to-digital converting circuit 3, a second analog-to-digital converting circuit 4 and a subtracting circuit 5, it should be noted that the electronic components adopted by the positive signal extracting circuit 1, the negative signal extracting circuit 2, the first analog-to-digital converting circuit 3, the second analog-to-digital converting circuit 4 and the subtracting circuit 5 related to the present embodiment can be purchased and obtained directly from the market, and the present invention has no particular innovation for this; specifically, in this embodiment, the positive signal extraction circuit 1 and the negative signal extraction circuit 2 are both composed of an operational amplifier and a diode, the first analog-to-digital conversion circuit 3 and the second analog-to-digital conversion circuit 4 employ ADC modules of a digital signal controller DSC, and in other embodiments of the present application, separate ADC chips may also be directly employed; the subtraction circuit 5 is completed by adopting a digital signal controller DSC;
the positive signal extraction circuit 1 is used for extracting a positive signal component in the current signal and simultaneously setting the output of a negative signal component in the current signal to be zero; the input end signal 2.1 of the negative signal extraction circuit 2 is a current signal, the output end signal 2.2 is a negative signal component in the current signal, the negative signal extraction circuit 2 is used for extracting the negative signal component in the current signal and converting the negative signal component into a conversion positive signal component through positive and negative, the conversion positive signal component is used as an output end signal of the negative signal extraction circuit, and meanwhile, the output of the positive signal component in the current signal is set to be zero;
an input end 3.1 of the first analog-digital conversion circuit 3 is connected with an output end signal 1.2 of the positive signal extraction circuit 1, an output end 3.2 of the first analog-digital conversion circuit is electrically connected with a positive pole 5.1 of the subtraction circuit 5, and the first analog-digital conversion circuit 3 carries out digital quantity conversion on a positive signal component in the current signal and outputs a current positive signal digital quantity to the positive pole 5.1 of the subtraction circuit 5; an input end 4.1 of the second analog-digital circuit 4 is connected with an output end signal of the negative signal extraction circuit 2, an output end 4.2 of the second analog-digital circuit is electrically connected with a negative electrode 5.2 of the subtraction circuit 5, and the second analog-digital conversion circuit 4 carries out digital quantity conversion on a negative signal component in the current signal and outputs a current negative signal digital quantity to the negative electrode 5.2 of the subtraction circuit 5; the subtraction circuit 5 performs subtraction calculation on the current positive signal digital quantity and the current negative signal digital quantity and outputs the digital quantity of the current sampling signal.
In the embodiment, corresponding analog-digital conversion is respectively carried out on the positive signal component and the negative signal component of the current signal in the current sampling circuit, and after subtraction calculation, the current sampling precision can be doubled; meanwhile, the current sampling signal with higher precision is obtained by adopting the conventional analog-digital conversion circuits 3 and 4, and the sampling precision of the current is improved without adopting a single high-precision analog-digital conversion circuit with high price.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (6)
1. A high-precision current sampling circuit of a servo driver system is characterized by comprising a positive signal extraction circuit, a negative signal extraction circuit, a first analog-digital conversion circuit, a second analog-digital conversion circuit and a subtraction circuit, wherein an input end signal of the positive signal extraction circuit is a current signal, an output end signal of the positive signal extraction circuit is a positive signal component in the current signal, an input end signal of the negative signal extraction circuit is a current signal, an output end signal of the negative signal extraction circuit is a negative signal component in the current signal, an input end of the first analog-digital conversion circuit is connected with an output end signal of the positive signal extraction circuit, an output end of the first analog-digital conversion circuit is electrically connected with a positive electrode of the subtraction circuit, an input end of the second analog-digital circuit is connected with an output end signal of the negative signal extraction circuit, and an output end of the second analog-digital conversion circuit is electrically, and outputting the digital quantity of the current sampling signal through the subtraction circuit.
2. The high accuracy current sampling circuit of a servo driver system as recited in claim 1 wherein said positive signal extraction circuit is configured to extract a positive signal component of said current signal while setting a negative signal component output of said current signal to zero.
3. The high-precision current sampling circuit of a servo driver system as claimed in claim 1, wherein said negative signal extracting circuit is configured to extract a negative signal component in said current signal and convert it into a converted positive signal component by positive and negative, which is an output signal of said negative signal extracting circuit, while setting an output of the positive signal component in said current signal to zero.
4. The high accuracy current sampling circuit of a servo driver system as set forth in claim 1 wherein said first analog-to-digital conversion circuit digitally converts a positive signal component of said current signal and outputs a current positive signal digital to a positive pole of said subtraction circuit.
5. The high accuracy current sampling circuit of the servo driver system as set forth in claim 4 wherein said second analog-to-digital conversion circuit performs digital value conversion on the negative signal component in said current signal and outputs a current negative signal digital value to the negative terminal of said subtraction circuit.
6. The high accuracy current sampling circuit of the servo driver system as recited in claim 5 wherein said subtraction circuit subtracts said current positive signal digital quantity and said current negative signal digital quantity to output a digital quantity of a current sample signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921294999.XU CN210690679U (en) | 2019-08-12 | 2019-08-12 | High-precision current sampling circuit of servo driver system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921294999.XU CN210690679U (en) | 2019-08-12 | 2019-08-12 | High-precision current sampling circuit of servo driver system |
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| Publication Number | Publication Date |
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| CN210690679U true CN210690679U (en) | 2020-06-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921294999.XU Active CN210690679U (en) | 2019-08-12 | 2019-08-12 | High-precision current sampling circuit of servo driver system |
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| CN (1) | CN210690679U (en) |
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- 2019-08-12 CN CN201921294999.XU patent/CN210690679U/en active Active
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