CN103973294A - Minimum value taking circuit - Google Patents
Minimum value taking circuit Download PDFInfo
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- CN103973294A CN103973294A CN201410185590.XA CN201410185590A CN103973294A CN 103973294 A CN103973294 A CN 103973294A CN 201410185590 A CN201410185590 A CN 201410185590A CN 103973294 A CN103973294 A CN 103973294A
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- circuit
- minimum value
- diode
- follow
- negative terminal
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Abstract
The invention discloses a minimum value taking circuit. The minimum value taking circuit comprises multiple paths of signal sources, a following module, a minimum value taking module and an isolating module which are connected in sequence. The isolating module is used for outputting the minimum value of the signal sources, and the output end of the isolating module is further fed back to the following module. According to the minimum value taking circuit, the minimum value taking module and the isolating module are included in the following module through the changes of the connecting relation of the following module, the minimum value taking module and the isolating module, and thus the difference of a discrete device and the output error caused by temperature drift are eliminated; through the feedback state of the following module, the automatic compensation for the deviation of tube voltage drop is achieved, and the accuracy and the reliability of control signals are improved.
Description
Technical field
The present invention relates to control signal reliability design technology field, be specifically related to a kind of minimum signal gating circuit.
Background technology
Control signal transmitting is an important component part of circuit reliability design field, usually needs to select correct control signal in the time of the same output of multiple control signal control.Wherein, the selection of getting small-signal is an important control signal selection mode, and that this circuit has is simple in structure, use that device is few, low cost and other advantages.
Traditional get little circuit can correctly export minimum value in the time that self device is working properly, principle schematic as shown in Figure 1.As shown in Figure 1, V1 ', V2 ', V3 ' represent signal source, D1 ' ~ D4 ' represents diode, wherein D4 ' is isolating diode, R0 ' ~ R3 ' represents resistance, and wherein R0 ' is pull-up circuit resistance, and U1 ' ~ U3 ' represents operational amplifier, Vcc ' draws power supply on representing, Vo ' represents to get little circuit output.Wherein, get diode (for example, the D1 ' in Fig. 1 in little circuit, D2 ', D3 ') negative terminal and operational amplifier (for example, the U1 ' in Fig. 1, U2 ', shown in U3 ') output be connected, and by resistance (for example, R1 ' in Fig. 1, R2 ', R3 ') and operational amplifier (for example, the U1 ' in Fig. 1, U2 ', shown in U3 ') input negative terminal be connected.Get little diode (for example, the D1 ' in Fig. 1, D2 ', D3 ') anode parallel connection, by pull-up resistor R0 ' with on draw power Vcc ' be connected, and be connected with the anode of isolating diode D4 ', the negative terminal of isolating diode D4 ' is as output Vo '.
Although this circuit is simple and easy to use, but there is intrinsic shortcoming in this circuit, mainly contain two: discrete device diode self or environmental factor can cause mutual tube voltage drop to have deviation, in circuit, this deviation cannot be compensated, and circuit output valve be signal input value and two tube voltage drop deviations and, cause circuit output to have error; The existence of floating due to temperature causes device unstable, thereby causes control signal low precision.Therefore, traditional get the existence of little circuit due to himself inherent shortcoming, reduced to a certain extent precision and the reliability of circuit.
Therefore the precision and the reliability that how to improve circuit become one of current problem demanding prompt solution.
Summary of the invention
The invention provides one and get minimum value circuit, improve precision and the reliability of circuit.
For achieving the above object, the invention provides one and get minimum value circuit, be characterized in, this is got minimum value circuit and includes successively some roads signal source of connecting, follows module, gets little module and isolation module, isolation module signal source output minimum value, this isolation module output also feeds back to follows module.
The above-mentioned minimum value circuit of getting comprises:
The first follow circuit, it inputs termination first signal source;
The second follow circuit, it inputs termination secondary signal source;
The 3rd follow circuit, its input termination the 3rd signal source;
Get little module, it comprises: pull-up circuit, and after being connected in parallel, anode is connected with pull-up circuit first gets little diode, second and get little diode, the 3rd and get little diode; First gets little diode negative terminal connects the first follow circuit output, and second gets little diode negative terminal connects the second follow circuit output; The 3rd gets little diode negative terminal connects the 3rd follow circuit output;
Isolating diode, its anode and first gets that little diode, second is got little diode, the 3rd anode of getting little diode is connected;
The negative terminal of above-mentioned isolating diode is connected with the input of described the first follow circuit, forms the feedback circuit of the first follow circuit;
The negative terminal of above-mentioned isolating diode is connected with the input of described the second follow circuit, forms the feedback circuit of the second follow circuit;
The negative terminal of above-mentioned isolating diode is connected with the input of described the 3rd follow circuit, forms the feedback circuit of the 3rd follow circuit;
The negative terminal of above-mentioned isolating diode is as described output of getting minimum value circuit.
The first above-mentioned follow circuit comprises the first operational amplifier, and first signal source connects the anode input of the first operational amplifier; Described isolating diode negative terminal connects the negative terminal input of the first operational amplifier, forms the negative feedback of the first follow circuit.
The second above-mentioned follow circuit comprises the second operational amplifier, and secondary signal source connects the anode input of the second operational amplifier; Described isolating diode negative terminal connects the negative terminal input of the second operational amplifier, forms the negative feedback of the second follow circuit.
The 3rd above-mentioned follow circuit comprises the 3rd operational amplifier, and the 3rd signal source connects the anode input of the 3rd operational amplifier; Described isolating diode negative terminal connects the negative terminal input of the 3rd operational amplifier, forms the negative feedback of the 3rd follow circuit.
Between above-mentioned isolating diode and the first follow circuit, circuit is connected with the first resistance.
Between above-mentioned isolating diode and the second follow circuit, circuit is connected with the second resistance.
Between above-mentioned isolating diode and the 3rd follow circuit, circuit is connected with the 3rd resistance.
Above-mentioned pull-up circuit comprises: above draw power supply, and on draw the pull-up resistor connecing under power supply.
The present invention gets the little circuit of getting of minimum value circuit and prior art and compares, its advantage is, the present invention changes by follow circuit and the annexation of getting little diode, isolating diode, to get little diode and isolating diode is included in follow circuit, eliminate otherness and the temperature of discrete device and floated caused output error, by the feedback states of follow circuit, realize the auto-compensation of tube voltage drop deviation, improve control signal precision and reliability.
Brief description of the drawings
Fig. 1 is the circuit diagram of getting little circuit in prior art;
Fig. 2 is the circuit module figure that the present invention gets minimum value circuit;
Fig. 3 is the circuit diagram that the present invention gets minimum value circuit.
Embodiment
Below in conjunction with accompanying drawing, further illustrate specific embodiments of the invention.
The technical problem to be solved in the present invention is to get for tradition the problem that the precision that causes of defect that minimum value circuit exists and reliability reduce, and technical scheme of the present invention has proposed a kind of novel minimum value circuit of getting in view of the above problems.In technical scheme of the present invention get minimum value circuit by signal first follow get again little, circuit output end is as the mode of feedback, and will get little diode and isolating diode envelope in feedback, solve tradition and got the device otherness that minimum value circuit exists, avoid temperature to float the device error of bringing simultaneously, improved precision and the reliability of circuit output.
As shown in Figure 2, the open one of the present invention is got minimum value circuit, this is got minimum value circuit and includes successively some roads signal source 1 of connecting, follows module 2, gets little module 3 and isolation module 4, isolation module 4 signal source output minimum values, and these isolation module 4 outputs also feed back to follows module 2.Get little module 3 and take out the minimum value in some signal sources 1.
As shown in Figure 3, get a kind of embodiment of minimum value circuit for the present invention is disclosed, this is got minimum value circuit input end and connects three tunnel signal sources: first signal source V
1, secondary signal source V
2with the 3rd signal source V
3, take out the minimum value in three signal sources by getting minimum value circuit.
Get minimum value circuit and comprise the module of following that connects respectively three tunnel signal sources, connect the little module of getting of following module, and connect the isolation module of getting little module.
Follow module and comprise the first follow circuit, the second follow circuit and the 3rd follow circuit.The first follow circuit includes the first operational amplifier U
1, this first operational amplifier U
1anode input meet first signal source V
1.The second follow circuit includes the second operational amplifier U
2, this second operational amplifier U
2anode input meet secondary signal source V
2.The 3rd follow circuit includes the 3rd operational amplifier U
3, the 3rd operational amplifier U
3anode input meet the 3rd signal source V
3.This first follow circuit, the second follow circuit and the 3rd follow circuit are followed respectively output first signal source V
1, secondary signal source V
2with the 3rd signal source V
3.
Getting little module comprises: pull-up circuit, and after being connected in parallel, anode is connected with pull-up circuit first gets little diode D
1, second get little diode D
2with the 3rd get little diode D
3.First gets little diode D
1negative terminal connects the first operational amplifier U in the first follow circuit
1output.Second gets little diode D
2negative terminal connects the second operational amplifier U in the second follow circuit
2output.The 3rd gets little diode D
3negative terminal connects the 3rd operational amplifier U in the 3rd follow circuit
3output.
Pull-up circuit comprises: above draw power Vcc, and on draw the pull-up resistor Rc connecing under power Vcc.First gets little diode D
1, second get little diode D
2with the 3rd get little diode D
3anode be connected in parallel, and by pull-up resistor Rc with on draw power Vcc to be connected.On to draw the value of power Vcc can be+12V.
Isolation module includes an isolating diode D
4, isolating diode D
4anode and first get little diode D
1, second get little diode D
2with the 3rd get little diode D
3anode be connected, the negative terminal of isolating diode is as the output V that gets minimum value circuit
0, the minimum signal in output three tunnel signal sources.
Meanwhile, isolating diode D
4negative terminal by first resistance R
1be connected to the first operational amplifier U
1negative terminal input, form the negative-feedback circuit of the first follow circuit.
Isolating diode D
4negative terminal by second resistance R
2be connected to the second operational amplifier U
2negative terminal input, form the negative-feedback circuit of the second follow circuit.
Isolating diode D
4negative terminal by the 3rd resistance R
3be connected to the 3rd operational amplifier U
3negative terminal input, form the negative-feedback circuit of the 3rd follow circuit.
This first resistance R
1, the second resistance R
2, the 3rd resistance R
3resistance value scope is that 1K ohm is to 2K ohm, for forming voltage follow.
By the input negative terminal that feeds back to operational amplifier of resistance, realization will be got minimum value circuit output valve and input value is consistent.Employing will be got minimum value circuit, buffer circuit envelope in follow circuit, introduce degenerative scheme at output, compensate the error that diode component difference, pressure drop difference cause; Eliminate temperature and floated the output error and the mistake that cause, improved the precision of circuit, improved the precision of circuit.
Although content of the present invention has been done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to limitation of the present invention.Read after foregoing those skilled in the art, for multiple amendment of the present invention and substitute will be all apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (9)
1. get minimum value circuit for one kind, it is characterized in that, this is got minimum value circuit and includes successively some roads signal source of connecting, follows module, gets little module and isolation module, isolation module signal source output minimum value, and this isolation module output also feeds back to follows module.
2. the minimum value circuit of getting as claimed in claim 1, is characterized in that, this is got minimum value circuit and comprises:
The first follow circuit, it inputs termination first signal source;
The second follow circuit, it inputs termination secondary signal source;
The 3rd follow circuit, its input termination the 3rd signal source;
Get little module, it comprises: pull-up circuit, and after being connected in parallel, anode is connected with pull-up circuit first gets little diode, second and get little diode, the 3rd and get little diode; First gets little diode negative terminal connects the first follow circuit output, and second gets little diode negative terminal connects the second follow circuit output; The 3rd gets little diode negative terminal connects the 3rd follow circuit output;
Isolating diode, its anode and described first gets that little diode, second is got little diode, the 3rd anode of getting little diode is connected;
The negative terminal of described isolating diode is connected with the input of described the first follow circuit, forms the feedback circuit of described the first follow circuit;
The negative terminal of described isolating diode is connected with the input of described the second follow circuit, forms the feedback circuit of described the second follow circuit;
The negative terminal of described isolating diode is connected with the input of described the 3rd follow circuit, forms the feedback circuit of described the 3rd follow circuit;
The negative terminal of described isolating diode is as described output of getting minimum value circuit.
3. the minimum value circuit of getting as claimed in claim 2, is characterized in that, the first described follow circuit comprises the first operational amplifier, and first signal source connects the anode input of the first operational amplifier; Described isolating diode negative terminal connects the negative terminal input of the first operational amplifier, forms the negative feedback of the first follow circuit.
4. the minimum value circuit of getting as claimed in claim 2, is characterized in that, the second described follow circuit comprises the second operational amplifier, and secondary signal source connects the anode input of the second operational amplifier; Described isolating diode negative terminal connects the negative terminal input of the second operational amplifier, forms the negative feedback of the second follow circuit.
5. the minimum value circuit of getting as claimed in claim 2, is characterized in that, the 3rd described follow circuit comprises the 3rd operational amplifier, and the 3rd signal source connects the anode input of the 3rd operational amplifier; Described isolating diode negative terminal connects the negative terminal input of the 3rd operational amplifier, forms the negative feedback of the 3rd follow circuit.
6. get as claimed in claim 2 or claim 3 minimum value circuit, it is characterized in that, between described isolating diode and the first follow circuit, circuit is connected with the first resistance.
7. as described in claim 2 or 4, get minimum value circuit, it is characterized in that, between described isolating diode and the second follow circuit, circuit is connected with the second resistance.
8. as described in claim 2 or 5, get minimum value circuit, it is characterized in that, between described isolating diode and the 3rd follow circuit, circuit is connected with the 3rd resistance.
9. the minimum value circuit of getting as claimed in claim 2, is characterized in that, described pull-up circuit comprises: above draw power supply, and on draw the pull-up resistor connecing under power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410185590.XA CN103973294A (en) | 2014-05-05 | 2014-05-05 | Minimum value taking circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410185590.XA CN103973294A (en) | 2014-05-05 | 2014-05-05 | Minimum value taking circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103973294A true CN103973294A (en) | 2014-08-06 |
Family
ID=51242405
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410185590.XA Pending CN103973294A (en) | 2014-05-05 | 2014-05-05 | Minimum value taking circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103973294A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03192919A (en) * | 1989-12-22 | 1991-08-22 | Nec Corp | Cmos integrated circuit |
| EP0584403A1 (en) * | 1992-08-26 | 1994-03-02 | Yozan Inc. | Circuit calculating the minimum value |
| CN203191436U (en) * | 2013-01-05 | 2013-09-11 | 北京科诺伟业科技有限公司 | Over-current detection circuit applied on wind power generation current transformer |
-
2014
- 2014-05-05 CN CN201410185590.XA patent/CN103973294A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03192919A (en) * | 1989-12-22 | 1991-08-22 | Nec Corp | Cmos integrated circuit |
| EP0584403A1 (en) * | 1992-08-26 | 1994-03-02 | Yozan Inc. | Circuit calculating the minimum value |
| CN203191436U (en) * | 2013-01-05 | 2013-09-11 | 北京科诺伟业科技有限公司 | Over-current detection circuit applied on wind power generation current transformer |
Non-Patent Citations (1)
| Title |
|---|
| 尚进等: "高精度电压采样及三选中冗余电路的模拟实现及仿真分析", 《应用装置》 * |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
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| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20140806 |