CN100341248C - Current-controlled current-to-voltage converter - Google Patents
Current-controlled current-to-voltage converter Download PDFInfo
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- CN100341248C CN100341248C CNB021184968A CN02118496A CN100341248C CN 100341248 C CN100341248 C CN 100341248C CN B021184968 A CNB021184968 A CN B021184968A CN 02118496 A CN02118496 A CN 02118496A CN 100341248 C CN100341248 C CN 100341248C
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- 238000005312 nonlinear dynamic Methods 0.000 claims description 20
- 230000005693 optoelectronics Effects 0.000 claims description 14
- 230000006698 induction Effects 0.000 claims description 13
- 229910044991 metal oxide Inorganic materials 0.000 claims description 12
- 150000004706 metal oxides Chemical class 0.000 claims description 12
- 239000004065 semiconductor Substances 0.000 claims description 12
- 239000000758 substrate Substances 0.000 claims description 4
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- 238000006243 chemical reaction Methods 0.000 description 15
- 238000010586 diagram Methods 0.000 description 13
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- 230000002950 deficient Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
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- 238000001514 detection method Methods 0.000 description 1
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- 230000009931 harmful effect Effects 0.000 description 1
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Abstract
The present invention discloses a current/voltage converting device controlled by current. After a photoelectric converting program is applied to the present invention, an obtained analog current signal is converted into a usable digit voltage type. The present invention comprises a fixed current control circuit, a nonlinearity dynamic resistance circuit and a current limiting circuit, wherein the fixed current control circuit can receive input current. When the input current is below rated current, the input current all flows into the fixed current control circuit. When the input current is larger than the rated current of the fixed current control circuit, the current flowing into the fixed current control circuit is constant, and the surplus current flows into the nonlinearity dynamic resistance circuit. When the input current flows into the fixed current control circuit and the nonlinearity dynamic resistance circuit and exceeds the other rated current, the surplus current all flows into the current limiting circuit.
Description
Technical field
The present invention relates to a kind of current/voltage-converted device, particularly a kind ofly can be applicable to that the analog signal conversion of gained becomes the spendable digital signal form of Digital Logical Circuits after the opto-electronic conversion program with Current Control.
Background technology
See also Fig. 1, for input resistance in the known photoelectric conversion device is the circuit of fixed resistance.As shown in Figure 1, it is the photoelectric switching circuit that is generally in the control IC of a computer mouse inside, at an optoelectronic induction assembly 101 an emitter-base bandgap grading ends fixed resistance 102 in parallel, through a comparator 103 and reference voltage Vref contrast, directly the contrast input signal is uneven, wherein easy fixed resistance 102 only can be along with current signal 15 sizes of input are made linear change, for Photoinduction device because the direct current horizontal drift that external fast moving and angle environmental change are caused, or the situation that differs of the variation that produces signal amplitude, produce for wanting correct sensed current signal have error often; The selection of fixed resistance 102 in addition must be different and must change its resistance size again along with optoelectronic induction assembly 101 or application circuit.
Common improvement mode sees also Fig. 2 for to change fixed resistance into dynamic electric resistor, changes the circuit diagram of dynamic electric resistor into for input resistance among Fig. 1.As shown in Figure 2, utilize the dynamic electric resistor characteristic of a MOS (Metal-oxide-semicondutor) transistor 103, change its current/voltage characteristic curve, yet this kind mode still has shortcoming promptly after input current is greater than a certain value, its input voltage still can rise.
Seeing also Fig. 3, is the voltage-current characteristic curve synoptic diagram that changes dynamic electric resistor for input resistance among Fig. 2 into.As input current Is during less than I1, the voltage output of Vin is clamped in specific voltage 0～Vc scope, can restrain the excessive situation of direct current output amplitude drift, and after input current Is is greater than I1, its input voltage vin should begin to be clamped to the Vc value, but in fact Vin still can continue to rise, and this curve still becomes an ascendant trend.Therefore above-mentioned defective also can't solve fully.
See also Fig. 4, the change in voltage schematic diagram that is produced during for commonly used photoelectric conversion device fast moving.As shown in Figure 4, for the Photoinduction device in the computer mouse because during user's fast moving computer mouse, the average current level drift that Photoinduction device is caused external fast moving and angle environmental change, or the situation that differs of the variation of signal amplitude, for example average current level is from the variation between a → b → c → d and the situation of amplitude variations.That is crest/trough voltage still has the upwards trend of drift; for leakage current because of optoelectronic induction assembly itself; reach electric current and solution not yet in effect that runner hole and environmental change etc. are produced, manifest and want correct sensed current signal in this case, produce error through regular meeting.
See also Fig. 5, be the electric current/time conversion diagram figure of photoelectric subassembly commonly used.According to general mouse input detection device design, be the processing mode of voltage kenel often for input signal, and this kind mode often neglects photoelectric sensor circuit in being subjected to photoreduction process, the reality that is produced is the characteristic of electric current kenel, as shown in Figure 5, and when electric current rises by It1 to It2, the output high level, when electric current descends by It2 to It1, export low-levelly, wherein current signal is that sensing according to light sensing component is along with the time changes.
Seeing also Fig. 6, is the desirable current/voltage characteristic curve chart of a photoelectric conversion device.Shown in figure six, when the input current Iin of photoelectric subassembly generation is lower than the first rated current It1 (A district), output voltage is 0, the input current Iin that produces when photoelectric subassembly is during greater than the second rated current It2 (C district), clamp output voltage is Vin (Vref2), when input current Iin between between the first rated current It1 and the second rated current It2, then work in the B district.
Summary of the invention
The further improvement that the present invention does for the shortcoming of the above-mentioned common technology of solution.Main purpose of the present invention is to provide the current/voltage-converted device of an analog current input signal, to produce a reliable and stable voltage output, the influence that the leakage current that can not only press down the bad generation of reason environmental change or mechanism causes the drift of signal averaging levels of current to be caused, and make the voltage output after the conversion keep stable, export through a comparator again, make and offer the easier correct digital voltage waveform output that contrasts back one stage arrangement and use.
For reaching above-mentioned purpose, a fixed current controling circuit, a Nonlinear Dynamic resistance circuit and a current-limiting circuit have been the present invention includes.Fixed current controling circuit can accept to come from the input current of an optoelectronic induction assembly, when this input current is lower than default one first rated current of this fixed current controling circuit, then input current flows in this fixed current controling circuit entirely, when input current during greater than this first rated current, this input current is then shunted and is flowed into this fixed current controling circuit and a Nonlinear Dynamic resistance circuit, the electric current that flows into this fixed current controling circuit can maintain certain value, remaining electric current then flows in this Nonlinear Dynamic resistance circuit, this Nonlinear Dynamic resistance circuit is in parallel with this fixed current controling circuit, this Nonlinear Dynamic resistance circuit has an equivalent dynamic electric resistor, and this equivalence dynamic electric resistor value can determine a voltage levvl.
The invention is characterized in and comprise a current-limiting circuit, in parallel with this fixed current controling circuit, when the electric current that flows into this fixed current controling circuit adds the electric current that flows into this Nonlinear Dynamic resistance circuit greater than default second rated current, then unnecessary electric current flows in this current-limiting circuit entirely, wherein said fixed current controling circuit is made of a metal-oxide semiconductor transistor and the fixed condenser that is connected on its grid, described equivalent dynamic electric resistor is that a metal-oxide semiconductor transistor constitutes, the grid of this metal-oxide semiconductor transistor is connected with drain electrode, and described current-limiting circuit is made of a P type metal-oxide semiconductor transistor.
More than be brief description of the present invention,, cooperate following graphic and figure number now more to be described in detail as follows for making understanding, the understanding that the present invention is had a nearlyer step:
Description of drawings
Fig. 1 is the circuit of fixed resistance for input resistance in the known photoelectric conversion device.
Fig. 2 changes the circuit diagram of dynamic electric resistor into for input resistance among Fig. 1.
Fig. 3 changes the voltage-to-current curve synoptic diagram of dynamic electric resistor into for input resistance among Fig. 2.
Fig. 4 is produced the change in voltage schematic diagram during by photoelectric conversion device fast moving commonly used.
Fig. 5 is the electric current/time conversion diagram figure of photoelectric conversion device commonly used.
Fig. 6 is the desirable current/voltage characteristic curve chart of a photoelectric conversion device.
Fig. 7 is the preferred embodiment of block schematic diagram of the present invention.
Fig. 8 is the preferred embodiment of circuit diagram of the present invention.
Fig. 9 for implement preferred embodiment of the present invention the schematic diagram of the current/voltage characteristic curve chart that can form.
The figure number explanation:
The 2-fixed current controling circuit
3-Nonlinear Dynamic resistance circuit
The 4-current-limiting circuit
101-optoelectronic induction assembly
102,201,301-resistance
The 103-comparator
104,204,302,400-MOS transistor
202,203-diode
Embodiment
The present invention discloses a kind of current/voltage-converted device of Current Control, can be applicable to the digital signal pattern that the analog current signal of gained after the opto-electronic conversion program converts the Digital Logic pattern to particularly in a kind of, as current/voltage-converted device of using in the computer mouse point device etc.
The present invention includes a fixed current controling circuit, a Nonlinear Dynamic resistance circuit and a current-limiting circuit.Fixed current controling circuit can accept to come from an input current of an optoelectronic induction assembly, when this input current value is lower than default one first rated current of this fixed current controling circuit, then input current can all flow in this fixed current controling circuit, and when input current during greater than this rated current, input current is then shunted and is flowed in this fixed current controling circuit and the Nonlinear Dynamic resistance circuit, the electric current that flows into this fixed current controling circuit can maintain certain value, and remaining electric current then flows in this Nonlinear Dynamic resistance circuit.
This Nonlinear Dynamic resistance circuit, wherein an end is in parallel with this fixed current controling circuit, and this Nonlinear Dynamic resistance circuit has an equivalent dynamic electric resistor, and this equivalence dynamic electric resistor value can determine a voltage levvl.This current-limiting circuit, the one end is in parallel with this fixed current controling circuit, when the electric current that flows into this fixed current controling circuit added the electric current that flows into this Nonlinear Dynamic resistance circuit greater than default second rated current, then unnecessary electric current flow in this current-limiting circuit entirely.
See also Fig. 7, be the preferred embodiment of block schematic diagram of the present invention.Optoelectronic induction assembly 101 produces an electric current I s, Is intercropping at any time is linear to be increased, its first rated current that flows into fixed current controling circuit 2 is It1, the electric current that flows into Nonlinear Dynamic resistance circuit 3 is Id, flowing into current-limiting circuit 4 is electric current I limit, wherein Vin is the voltage kenel that photoelectric current converts to, exports a magnitude of voltage Vout with specific transition voltage Vref1 through comparator 103 (can be an operational amplifier).
When the input current Is of optoelectronic induction assembly 101 input be lower than fixed current controling circuit 2 during the specified first rated current It1, input current Is flows in the constant-current circuit 2 entirely, then Vin voltage is zero; When input current Is between between the first rated current It1 and the second rated current It2 (It2=It1l+Id), Vin will with Verf1 make comparisons with the decision Vout uneven, as input current Is during greater than the second rated current It2, unnecessary electric current I 1imit flows in this current-limiting circuit 4 entirely, and comparator 103 output Vout then fixedly are output as high-level voltage.So, can suppress the bad leakage current influence that causes of optoelectronic induction assembly because of the associated mechanisms that is mated is provided with, in conjunction with the Improvement type dynamic electric resistor, not only have and conversion back output voltage can be clamped in the particular range Vref2, also can suppress the influence of leakage current simultaneously.
See also Fig. 8, be the preferred embodiment of circuit diagram of the present invention.Fixed resistance 201, diode 202 and 203, MOS transistor 204 is set up into a fixed current controling circuit 2 jointly, wherein diode 202 and 203 can be respectively be made of the PN joint (P-Njunction) of bipolar transistor (BJT), series connection offers the needed fixed-bias transistor circuit value of grid of MOS transistor 204, and MOS transistor 204 plays a constant current source.Moreover, one NMOS (N type Metal-oxide-semicondutor) transistor 302 is in parallel with the Nonlinear Dynamic resistance circuit 3 that an earth resistance 301 is synthesized, and finish current-limiting circuit 4 by a PMOS (P type Metal-oxide-semicondutor) transistor 400, the substrate of PMOS transistor 400 (substrate) can be connected to the positive potential of any reference potential, for example is to receive Vdrv (for example being 2.4v) or Vref (for example being 1.6v).
Moreover the voltage levvl Vin and the reference voltage Vref 1 that are produced are made comparisons, and promptly produce the output Vout of a digital voltage.Wherein the vref2 value will limit the ceiling voltage output of Vin, can desire the reference voltage that clamp is lived for Vdrv or Vref or other, that is in the Vref2 value that Vout exported, the ceiling voltage of being exported for comparator 103.
Seeing also figure nine, is for implementing the formed current/voltage characteristic curve chart of the present invention.As shown in Figure 9 be according to the output voltage V in of figure eight circuit and the characteristic curve of input current Is.When input current Is be lower than fixed current controling circuit during specified electric current I t1, the relative low voltage of Vin output, when input current Is greater than fixed current controling circuit during specified electric current, the relative amplification of Vin voltage becomes big, after input current is greater than It2, unnecessary electric current will flow in the current-limiting circuit, be formed on fixed value Vref2 and Vin will consolidate the current-limiting circuit case.Comparator with Vin with can draw desirable digital waveform after the Vref1 reference voltage is compared, use for downstream component.Please Fig. 9 is in contrast to Fig. 6, the present invention as can be known available current/voltage characteristic curve very near desirable current/voltage characteristic curve, also solved the harmful effect that defective caused on the common technology.
In sum, current/voltage-converted device by Current Control of the present invention is implemented, can be for Photoinduction device because the direct current horizontal drift that external fast moving and angle environmental change are caused effectively eliminate, and the variation that the solves signal amplitude situation that differs, do not have error for the situation of wanting correct sensed current signal and produce; In addition for the selection of fixed resistance, also must be not different and must change its resistance size again along with optoelectronic induction assembly or application circuit.
Explanation via above-mentioned preferred embodiment, the conversion equipment of analog current input signal provided by the present invention can produce a reliable and stable voltage output, can not only suppress the winding border changes, or the leakage current of the bad generation of the mechanism influence that causes the signal dc shift to be caused, and make the voltage average level after the conversion keep stable, export through a comparator again, the feasible easier correct digital voltage waveform output that contrasts, offer back one stage arrangement and use, this can do improvement and have special effect the defective of common technology.
Described above, only be preferred embodiment of the present invention, be not used for limiting the scope that the present invention implements.All equalizations of doing according to claim of the present invention change and modify, and all should think to belong to the scope that the present invention is contained.
Claims (7)
1, a kind of current/voltage-converted device of Current Control comprises:
One fixed current controling circuit, can accept an input current, when this input current is lower than default one first rated current of this fixed current controling circuit, then input current flows in this fixed current controling circuit entirely, when input current during greater than this first rated current, this input current is then shunted and is flowed into this fixed current controling circuit and a Nonlinear Dynamic resistance circuit, the electric current that flows into this fixed current controling circuit can be kept certain value, remaining electric current then flows in this Nonlinear Dynamic resistance circuit, and sets up a voltage levvl;
This Nonlinear Dynamic resistance circuit, it is in parallel with this fixed current controling circuit, and this Nonlinear Dynamic resistance circuit has an equivalent dynamic electric resistor;
It is characterized in that also comprising a current-limiting circuit, the one end is in parallel with this fixed current controling circuit, when the electric current that flows into this fixed current controling circuit added the electric current that flows into this Nonlinear Dynamic resistance circuit greater than default second rated current, then unnecessary electric current flow in this current-limiting circuit entirely
Wherein said fixed current controling circuit is made of a metal-oxide semiconductor transistor and the fixed condenser that is connected on its grid,
Described equivalent dynamic electric resistor is that a metal-oxide semiconductor transistor constitutes, and the grid of this metal-oxide semiconductor transistor is connected with drain electrode, and
Described current-limiting circuit is made of a P type metal-oxide semiconductor transistor.
2, the current/voltage-converted device of Current Control as claimed in claim 1, a fixed condenser of the grid of wherein said metal-oxide semiconductor transistor is connected to provide by several diodes.
3, the current/voltage-converted device of Current Control as claimed in claim 2, wherein said diode is made of bipolar transistor.
4, the current/voltage-converted device of Current Control as claimed in claim 1, the metal-oxide semiconductor transistor of wherein said equivalent dynamic electric resistor are a N type metal-oxide semiconductor transistor.
5, the current/voltage-converted device of Current Control as claimed in claim 1, the substrate of wherein said P type metal-oxide semiconductor transistor is connected to the positive potential of any reference potential.
6, the current/voltage-converted device of Current Control as claimed in claim 1, wherein said input current are provided by an optoelectronic induction assembly.
7, the current/voltage-converted device of Current Control as claimed in claim 1, described this voltage levvl are to input in the comparator and reference voltage relatively back output logic high potential or electronegative potential.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021184968A CN100341248C (en) | 2002-04-27 | 2002-04-27 | Current-controlled current-to-voltage converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021184968A CN100341248C (en) | 2002-04-27 | 2002-04-27 | Current-controlled current-to-voltage converter |
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| CN1453935A CN1453935A (en) | 2003-11-05 |
| CN100341248C true CN100341248C (en) | 2007-10-03 |
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| CNB021184968A Expired - Fee Related CN100341248C (en) | 2002-04-27 | 2002-04-27 | Current-controlled current-to-voltage converter |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101295986B (en) * | 2007-04-27 | 2010-06-16 | 联詠科技股份有限公司 | D/A conversion device with high driving ability |
| CN102263498B (en) * | 2011-07-22 | 2013-03-27 | 黑龙江省电力科学研究院 | High-precision current-voltage converter applied in distributed type data acquisition system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5276359A (en) * | 1993-02-02 | 1994-01-04 | Chiang Ting Chi | Current-input type interface circuit of a mouse |
| EP0608974A2 (en) * | 1993-01-27 | 1994-08-03 | Samsung Electronics Co., Ltd. | Base current-control circuit of an output transistor |
| US5623284A (en) * | 1995-04-18 | 1997-04-22 | Elan Microelectronics Corporation | Input device controller |
| CN1229961A (en) * | 1998-03-24 | 1999-09-29 | 盛群半导体股份有限公司 | Current controlled voltage changeover device |
-
2002
- 2002-04-27 CN CNB021184968A patent/CN100341248C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0608974A2 (en) * | 1993-01-27 | 1994-08-03 | Samsung Electronics Co., Ltd. | Base current-control circuit of an output transistor |
| US5276359A (en) * | 1993-02-02 | 1994-01-04 | Chiang Ting Chi | Current-input type interface circuit of a mouse |
| US5623284A (en) * | 1995-04-18 | 1997-04-22 | Elan Microelectronics Corporation | Input device controller |
| CN1229961A (en) * | 1998-03-24 | 1999-09-29 | 盛群半导体股份有限公司 | Current controlled voltage changeover device |
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| CN1453935A (en) | 2003-11-05 |
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