CN204926101U - High accuracy absolute value circuit - Google Patents
High accuracy absolute value circuit Download PDFInfo
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- CN204926101U CN204926101U CN201520621165.0U CN201520621165U CN204926101U CN 204926101 U CN204926101 U CN 204926101U CN 201520621165 U CN201520621165 U CN 201520621165U CN 204926101 U CN204926101 U CN 204926101U
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- operational amplifier
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- absolute value
- diode
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Abstract
The utility model relates to a high accuracy absolute value circuit, provide one kind with low costs, anti -interference, can be accurate the high accuracy absolute value circuit of sinusoidal wave absolute value of output sampled value. Including difference sampling circuit, decoupling circuit and the absolute value rectifier circuit who establishes ties in proper order, this circuit adopts the combination of operational amplifier, resistance and diode to constitute the absolute value circuit, and this circuit connection is simple, and there is forward voltage drop in it to have solved use rectifier diode on the one hand, can not get the problem of the absolute value voltage of high accuracy, also need not to use simultaneously dedicated chip, practices thrift the cost, on the other hand through with the using coordinately of difference sampling circuit and decoupling circuit, not only improved the precision of circuit, filtering simultaneously the interference.
Description
Technical field
The utility model relates to field of circuit control, particularly a kind of high precision absolute value circuit.
Background technology
In circuit control system, the AC signal of various circuit all has negative signal components, need first negative signal part to be become positive signal in concrete use procedure, namely need to add absolute value circuit and make output signal be the absolute value of input signal or be directly proportional to this absolute value; What in prior art, absolute value circuit was the most frequently used is directly use commutation diode, and this method is simple, but there is forward voltage drop due to diode, therefore can not get high-precision absolute value voltage; In addition, adopt special chip to sample, Costco Wholesale is high; Often there is serious interference in the signal simultaneously entering absolute value circuit in electric signal transmission, affects precision.
Utility model content
The utility model is a kind of high precision absolute value circuit, provides the high precision absolute value circuit that a kind of cost is low, anti-interference, accurately can export the sinusoidal wave absolute value of sampled value.
For achieving the above object, technical solutions of the utility model are:
A kind of high precision absolute value circuit, comprise differential sample circuit, isolation circuit and the absolute value rectification circuit of connecting successively, described absolute value rectification circuit comprises operational amplifier IC3A, resistance R10, resistance R5, resistance R6, diode D1 and diode D2; The positive input ground connection of described operational amplifier IC3A; One end of described resistance R10 is connected with the output terminal of described isolation circuit, and the other end of described resistance R10 is connected with the reverse input end of described operational amplifier IC3A; Described resistance R5 one end is connected with the reverse input end of described operational amplifier IC3A, and the other end is connected with the negative pole of described diode D1, and the positive pole of described diode D1 accesses the output terminal of described operational amplifier IC3A; Described resistance R6 one end is connected with the reverse input end of described operational amplifier IC3A, and the other end is connected with the positive pole of described diode D2, and the negative pole of described diode D2 accesses the output terminal of described operational amplifier IC3A; Described absolute value rectification circuit also comprises operational amplifier IC4A, resistance R7, resistance R8 and resistance R9; The positive input of described operational amplifier IC4A is connected with one end of described resistance R7, and the other end of described resistance R7 accesses the connected node of described resistance R5 and described diode D1; The reverse input end of described operational amplifier IC4A is connected with one end of described resistance R8, and the other end of described resistance R8 accesses the connected node of described resistance R6 and described diode D2; One end of described R9 is connected with the reverse input end of described operational amplifier IC4A, and the other end is connected with the output terminal of described operational amplifier IC4A.
Preferably, described isolation circuit comprises operational amplifier IC2A, and the positive input of described operational amplifier IC2A is connected with the output terminal of described differential sample circuit; The reverse input end of described operational amplifier IC2A is connected with the output terminal of described operational amplifier IC2A.
Preferably, described differential sample circuit comprises operational amplifier IC1A, resistance R1, resistance R2, resistance R3, resistance R4, electric capacity C1 and electric capacity C2; One end ground connection after described electric capacity C1 is in parallel with described resistance R3, the other end is connected with the positive input of described operational amplifier IC1A; After described electric capacity C2 is in parallel with described resistance R4, the reverse input end of described operational amplifier IC1A is accessed in one end, and the other end accesses the output terminal of described operational amplifier IC1A; Described R1 one end is connected with signal input part, and the other end is connected with the positive input of described operational amplifier IC1A; Described R2 one end is connected with signal input part, and the other end is connected with the reverse input end of described operational amplifier IC1A.
From above-mentioned to description of the present utility model, compared to the prior art, the utility model tool has the following advantages:
The utility model adopts the combination of operational amplifier, resistance and diode to form absolute value circuit, this circuit connection is simple, solves on the one hand and uses commutation diode to there is forward voltage drop, can not get the problem of high-precision absolute value voltage, simultaneously also without the need to using special chip, cost-saving; On the other hand by with being combined of differential sample circuit and isolation circuit, not only increase the precision of circuit, the interference of filtering simultaneously.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide further understanding of the present utility model, forms a part of the present utility model, and schematic description and description of the present utility model, for explaining the utility model, is not formed improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is that circuit of the present utility model connects block diagram;
Fig. 2 is the utility model circuit connection structure schematic diagram.
Embodiment
In order to make technical problem to be solved in the utility model, technical scheme and beneficial effect clearly, understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
See figures.1.and.2, a kind of high precision absolute value circuit, comprise differential sample circuit, isolation circuit and the absolute value rectification circuit of connecting successively, described absolute value rectification circuit comprises operational amplifier IC3A, resistance R10, resistance R5, resistance R6, diode D1 and diode D2; The positive input ground connection of described operational amplifier IC3A; One end of described resistance R10 is connected with the output terminal of described isolation circuit, and the other end of described resistance R10 is connected with the reverse input end of described operational amplifier IC3A; Described resistance R5 one end is connected with the reverse input end of described operational amplifier IC3A, and the other end is connected with the negative pole of described diode D1, and the positive pole of described diode D1 accesses the output terminal of described operational amplifier IC3A; Described resistance R6 one end is connected with the reverse input end of described operational amplifier IC3A, and the other end is connected with the positive pole of described diode D2, and the negative pole of described diode D2 accesses the output terminal of described operational amplifier IC3A; Described absolute value rectification circuit also comprises operational amplifier IC4A, resistance R7, resistance R8 and resistance R9; The positive input of described operational amplifier IC4A is connected with one end of described resistance R7, and the other end of described resistance R7 accesses the connected node of described resistance R5 and described diode D1; The reverse input end of described operational amplifier IC4A is connected with one end of described resistance R8, and the other end of described resistance R8 accesses the connected node of described resistance R6 and described diode D2; One end of described R9 is connected with the reverse input end of described operational amplifier IC4A, and the other end is connected with the output terminal of described operational amplifier IC4A.
Described isolation circuit comprises operational amplifier IC2A, and the positive input of described operational amplifier IC2A is connected with the output terminal of described differential sample circuit; The reverse input end of described operational amplifier IC2A is connected with the output terminal of described operational amplifier IC2A.
Described differential sample circuit comprises operational amplifier IC1A, resistance R1, resistance R2, resistance R3, resistance R4, electric capacity C1 and electric capacity C2; One end ground connection after described electric capacity C1 is in parallel with described resistance R3, the other end is connected with the positive input of described operational amplifier IC1A; After described electric capacity C2 is in parallel with described resistance R4, the reverse input end of described operational amplifier IC1A is accessed in one end, and the other end accesses the output terminal of described operational amplifier IC1A; Described R1 one end is connected with signal input part, and the other end is connected with the positive input of described operational amplifier IC1A; Described R2 one end is connected with signal input part, and the other end is connected with the reverse input end of described operational amplifier IC1A.
The utility model adopts the combination of operational amplifier, resistance and diode to form absolute value circuit, this circuit connection is simple, solves on the one hand and uses commutation diode to there is forward voltage drop, can not get the problem of high-precision absolute value voltage, simultaneously also without the need to using special chip, cost-saving; On the other hand by with being combined of differential sample circuit and isolation circuit, not only increase the precision of circuit, the interference of filtering simultaneously.
Above-mentioned explanation illustrate and describes preferred embodiment of the present utility model, as previously mentioned, be to be understood that the utility model is not limited to the form disclosed by this paper, should not regard the eliminating to other embodiments as, and can be used for other combinations various, amendment and environment, and can in utility model contemplated scope described herein, changed by the technology of above-mentioned instruction or association area or knowledge.And the change that those skilled in the art carry out and change do not depart from spirit and scope of the present utility model, then all should in the protection domain of the utility model claims.
Claims (3)
1. a high precision absolute value circuit, it is characterized in that: comprise differential sample circuit, isolation circuit and the absolute value rectification circuit of connecting successively, described absolute value rectification circuit comprises operational amplifier IC3A, resistance R10, resistance R5, resistance R6, diode D1 and diode D2; The positive input ground connection of described operational amplifier IC3A; One end of described resistance R10 is connected with the output terminal of described isolation circuit, and the other end of described resistance R10 is connected with the reverse input end of described operational amplifier IC3A; Described resistance R5 one end is connected with the reverse input end of described operational amplifier IC3A, and the other end is connected with the negative pole of described diode D1, and the positive pole of described diode D1 accesses the output terminal of described operational amplifier IC3A; Described resistance R6 one end is connected with the reverse input end of described operational amplifier IC3A, and the other end is connected with the positive pole of described diode D2, and the negative pole of described diode D2 accesses the output terminal of described operational amplifier IC3A; Described absolute value rectification circuit also comprises operational amplifier IC4A, resistance R7, resistance R8 and resistance R9; The positive input of described operational amplifier IC4A is connected with one end of described resistance R7, and the other end of described resistance R7 accesses the connected node of described resistance R5 and described diode D1; The reverse input end of described operational amplifier IC4A is connected with one end of described resistance R8, and the other end of described resistance R8 accesses the connected node of described resistance R6 and described diode D2; One end of described R9 is connected with the reverse input end of described operational amplifier IC4A, and the other end is connected with the output terminal of described operational amplifier IC4A.
2. a kind of high precision absolute value circuit as claimed in claim 1, is characterized in that: described isolation circuit comprises operational amplifier IC2A, and the positive input of described operational amplifier IC2A is connected with the output terminal of described differential sample circuit; The reverse input end of described operational amplifier IC2A is connected with the output terminal of described operational amplifier IC2A.
3. a kind of high precision absolute value circuit as claimed in claim 1, is characterized in that: described differential sample circuit comprises operational amplifier IC1A, resistance R1, resistance R2, resistance R3, resistance R4, electric capacity C1 and electric capacity C2; One end ground connection after described electric capacity C1 is in parallel with described resistance R3, the other end is connected with the positive input of described operational amplifier IC1A; After described electric capacity C2 is in parallel with described resistance R4, the reverse input end of described operational amplifier IC1A is accessed in one end, and the other end accesses the output terminal of described operational amplifier IC1A; Described R1 one end is connected with signal input part, and the other end is connected with the positive input of described operational amplifier IC1A; Described R2 one end is connected with signal input part, and the other end is connected with the reverse input end of described operational amplifier IC1A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520621165.0U CN204926101U (en) | 2015-08-18 | 2015-08-18 | High accuracy absolute value circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520621165.0U CN204926101U (en) | 2015-08-18 | 2015-08-18 | High accuracy absolute value circuit |
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| Publication Number | Publication Date |
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| CN204926101U true CN204926101U (en) | 2015-12-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520621165.0U Active CN204926101U (en) | 2015-08-18 | 2015-08-18 | High accuracy absolute value circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105893889A (en) * | 2016-03-21 | 2016-08-24 | 杨露萍 | Absolute value circuit |
| CN107203727A (en) * | 2017-05-17 | 2017-09-26 | 山东建筑大学 | A kind of undistorted absolute value circuit being made up of common amplifier |
| CN107425819A (en) * | 2017-05-17 | 2017-12-01 | 山东建筑大学 | A kind of positive and negative gain is adjustable respectively and output is positive amplifying circuit |
-
2015
- 2015-08-18 CN CN201520621165.0U patent/CN204926101U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105893889A (en) * | 2016-03-21 | 2016-08-24 | 杨露萍 | Absolute value circuit |
| CN107203727A (en) * | 2017-05-17 | 2017-09-26 | 山东建筑大学 | A kind of undistorted absolute value circuit being made up of common amplifier |
| CN107425819A (en) * | 2017-05-17 | 2017-12-01 | 山东建筑大学 | A kind of positive and negative gain is adjustable respectively and output is positive amplifying circuit |
| CN107203727B (en) * | 2017-05-17 | 2020-10-27 | 山东建筑大学 | Distortion-free absolute value circuit formed by common operational amplifier |
| CN107425819B (en) * | 2017-05-17 | 2020-10-27 | 山东建筑大学 | Amplifying circuit with respectively adjustable positive and negative gains and positive output |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: Xinle Road, Haicang District of Xiamen city of Fujian Province, No. 26 361000 Patentee after: AVIC Tech (Xiamen) electric power technology Limited by Share Ltd Address before: Xinle Road, Haicang District of Xiamen city of Fujian Province, No. 26 361000 Patentee before: AVIC Tech (Xiamen) Electronics Co., Ltd. |