CN203070145U - Current signal generating circuit and current compensating device - Google Patents
Current signal generating circuit and current compensating device Download PDFInfo
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Abstract
The utility model discloses a current signal produces circuit and current compensation arrangement. The current signal generating circuit includes: a first analog-to-digital conversion circuit having an input terminal receiving a temperature signal varying with temperature and an output terminal providing a first digital signal; and the first digital-to-analog conversion circuit is provided with a first input end, a second input end and an output end, wherein the first input end of the first digital-to-analog conversion circuit receives the first digital signal, the second input end of the first digital-to-analog conversion circuit receives a reference current signal, and a temperature current signal which is in a set relation with temperature is provided at the output end of the first digital-to-analog conversion circuit based on the first digital signal and the reference current signal. The current signal generating circuit can generate a current signal having a specific relationship with temperature, and the current signal can be compensated by the signal to obtain a current source which is basically not changed along with the temperature or has a set relationship with the temperature.
Description
Technical field
Embodiment of the present utility model relates to electronic-circuit device, more specifically still is not exclusively to relate to current signal to produce circuit and current signal compensation system.
Background technology
Current reference source has been played the part of the key player in application such as analog to digital converter and power integrated circuit.Traditional method mainly is to utilize voltage source and resistance to produce current reference source, because magnitude of voltage or the resistance of voltage source can change with temperature, causes the electric current of current reference source also to change with temperature.Keep substantially constant or be the reference current source of specific (settings) relation (for example with temperature linearity rising or reduction etc.) with temperature for obtaining in certain temperature range (for example-25 ℃ to 120 ℃), various compensation knots and compensation method are widely adopted.Fig. 1 illustrates a kind of current compensation method that adopts mimic channel, current source 101 is the current sources to be compensated with positive temperature coefficient (PTC) (electric current raises with temperature and increases), and current source 102 is the compensating current elements with negative temperature coefficient (electric current raises with temperature and reduces) that utilize a voltage source and a resistance to produce.By current source 101 and current source 102 additions are produced current source 103.Because the temperature coefficient of current source 102 is opposite with the temperature coefficient polarity (positive and negative) of current source 101, current source 102 has been offset the part variable quantity of current source 101 with temperature.That is, the temperature characterisitic of current source 103 (with variation of temperature) obviously is better than current source 101.But (absolute value) is inequality because the temperature coefficient of current source 101 and current source 102, and the current source 103 that produces after the addition is difficult to result from the current source that does not vary with temperature or be particular kind of relationship with the rising of nonlinear temperature.Though can change the temperature coefficient of current source 102 by the temperature coefficient that changes voltage source, the technological means such as temperature coefficient of resistance, it is approached with the absolute value of the temperature coefficient of current source 101 as far as possible.But the temperature coefficient of voltage source and resistance is closely related in technology, changes temperature coefficient cost height and the weak effect of voltage source or resistance.
How obtaining with the temperature basic fixed or be the current source of particular kind of relationship, and current signal is compensated, is the difficult problem that those skilled in the art will solve.
The utility model content
Consider one or more problem of the prior art, provide a kind of current signal to produce circuit and current compensator.
According to embodiment of the present utility model, provide a kind of current signal to produce circuit, comprising: first analog to digital conversion circuit, have input end and output terminal, its input end receives temperature variant temperature signal, and its output terminal provides first digital signal; And first D/A converting circuit, have first input end, second input end and output terminal, its first input end receives described first digital signal, its second input end receives reference current signal, provides the temperature current signal that is the relation of setting with temperature at its output terminal based on described first digital signal and described reference current signal.
According to embodiment of the present utility model, described temperature signal is by the temperature sense circuits sense, and described temperature sense circuit comprises: first resistance, have first end and second end, and its first end is coupled to first electromotive force, and its second end provides described temperature signal; And second resistance, having first end and second end, its first end is coupled to second end of described first resistance, and its second end is coupled to second electromotive force, and described second resistance has different temperature characterisitics with described first resistance.
According to embodiment of the present utility model, described second resistance is negative temperature characteristic resistance, and described first resistance is that positive temperature coefficient resistor or temperature coefficient are less than the resistance of the temperature coefficient of described second resistance.
According to embodiment of the present utility model, described first digital signal changes with temperature linearity.
According to embodiment of the present utility model, described first modulus is walked around and is changed circuit and comprise: first comparer, have first input end, second input end and output terminal, and its first termination is received described temperature signal, and output terminal provides first status signal; The logic with shift circuit, have first input end, second input end, first output terminal and second output terminal, its first input end receives described first status signal, its second input end receive clock signal, its first output terminal provides described first digital signal, its second output terminal provides first logical signal, the described first logical signal carry when described first status signal is first level, and described first logical signal is given up the throne when first status signal is second level; And second D/A converting circuit, having input end and output terminal, its input end is coupled to second end of described logic with shift circuit to receive described first logical signal, and its output terminal is coupled to second end of described first comparer so that threshold voltage signal to be provided.
According to embodiment of the present utility model, described second D/A converting circuit is non-linear D/A converting circuit, and comprise: resistance string, comprise resistance that a plurality of resistances do not wait producing a plurality of component voltages, the resistance of wherein said resistance is that the relation according to described temperature signal and temperature arranges; And multipurpose switch, one under described first logical signal control in the described a plurality of component voltages of selection to provide described threshold voltage signal.
According to embodiment of the present utility model, described first digital signal is the identical signal of essence with described first logical signal.
According to embodiment of the present utility model, described logic with shift circuit also comprises latch, have input end and output terminal, its input end is coupled to second output terminal of described logic with shift circuit to receive described first logical signal, its output terminal is coupled to or is configured to first output terminal of described logic with shift circuit, when described first logical signal switched between adjacent digital signal back and forth, described latch was selected in the described adjacent digital signal of output.
According to embodiment of the present utility model, described first D/A converting circuit is non-linear number analog conversion circuit, and described temperature current signal is step change with described first digital signal with the integral multiple of described reference current signal.
According to embodiment of the present utility model, described first D/A converting circuit is the linear number analog conversion circuit, and described temperature current signal is step change with described first digital signal with described reference current signal.
According to embodiment of the present utility model, also comprise a computing circuit, have first input end, second input end and output terminal, its first input end is coupled to the output terminal of described first analog to digital conversion circuit to receive described first digital signal, its second input end receives a digital regulating signal, and described computing circuit is adjusted described first digital signal and provided second digital signal at its output terminal based on described digital regulating signal; Described first D/A converting circuit produces described temperature current signal based on described second digital signal and described reference current signal.
According to embodiment of the present utility model, described second digital signal is described first digital signal and described digital regulating signal sum or is the poor of described first digital signal and described digital regulating signal.
According to embodiment of the present utility model, described current signal produces circuit and also comprises a computing circuit, have first input end, second input end and output terminal, its first input end is coupled to second output terminal of described logic with shift circuit to receive described first logical signal, its second input end receives a digital regulating signal, and described computing circuit is adjusted described first logical signal and provided second logical signal at its output terminal based on described digital regulating signal; The input end of described second D/A converting circuit is coupled to the output terminal of described computing circuit to receive described second logical signal, and its output terminal is coupled to second end of described first comparer so that threshold voltage signal to be provided.
According to embodiment of the present utility model, described second logical signal is described first logical signal and described digital regulating signal sum or is the poor of described first logical signal and described digital regulating signal.
According to embodiment of the present utility model, described digital regulating signal is fixing digital signal.
According to embodiment of the present utility model, described digital regulating signal is temperature variant digital signal.
According to embodiment of the present utility model, described digital regulating signal is provided by CPU or MCU or I2C circuit.
According to embodiment of the present utility model, described current signal produces circuit and also comprises: conditioning signal produces circuit, is coupled between the 3rd electromotive force and the 4th electromotive force, and the analog regulation signal is provided; Second analog to digital conversion circuit has input end and output terminal, and its input end is coupled to described conditioning signal and produces circuit to receive described analog regulation signal, and its output terminal provides described digital regulating signal.
According to embodiment of the present utility model, described current signal produces circuit and also comprises: conditioning signal produces circuit, is coupled between the 3rd electromotive force and the 4th electromotive force, and the analog regulation signal is provided; Second analog to digital conversion circuit has input end and output terminal, and its input end is coupled to described conditioning signal and produces circuit to receive described analog regulation signal, and its output terminal provides three digital signal; Scrambler has input end and output terminal, and its input end is coupled to the output terminal of described second analog to digital conversion circuit to receive described three digital signal, and its output terminal provides described digital regulating signal, and wherein said digital regulating signal is with the temperature monotone variation.
According to embodiment of the present utility model, this current signal produces circuit and is used for compensation first current signal, and described first current signal and described temperature signal are by a compensating circuit addition or subtract each other.
According to embodiment of the present utility model, a kind of circuit compensation apparatus that current signal is compensated is provided, comprise: analog to digital conversion circuit, have input end and output terminal, its input end is coupled to described temperature sense circuit to receive temperature variant temperature signal, and its output terminal provides first digital signal; D/A converting circuit, have first input end, second input end and output terminal, its first input end receives described first digital signal, its second input end receives reference current signal, provides the temperature current signal that is the relation of setting with temperature at its output terminal based on described first digital signal and described reference current signal; And compensating circuit, have first input end, second input end and output terminal, its first input end receives described temperature current signal, its second input end receives current signal to be compensated, described compensating circuit provides output current signal with described temperature current signal and described current signal addition to be compensated/subtract at output terminal.
According to embodiment of the present utility model, described temperature signal is by the temperature sense circuits sense, and described temperature sense circuit comprises: first resistance, have first end and second end, and its first end is coupled to first electromotive force, and its second end provides described temperature signal; And second resistance, having first end and second end, its first end is coupled to second end of described first resistance, and its second end is coupled to second electromotive force, and described second resistance has different temperature characterisitics with described first resistance.
Produce circuit according to the current signal of above-described embodiment and can produce the current signal that is particular kind of relationship with temperature, it is temperature variant substantially or be the current source of the relation of setting with temperature to compensate acquisition to current signal with this signal.
Description of drawings
Describe embodiment of the present utility model below with reference to the accompanying drawings in detail, wherein identical Reference numeral is represented identical parts or feature.
Fig. 1 illustrates a kind of current compensation method 100 that adopts mimic channel;
Fig. 2 illustrates the schematic circuit diagram according to the current compensation circuit 200 of an embodiment of the utility model;
Fig. 3 illustrates the synoptic diagram according to the current compensation method 300 of an embodiment of the utility model;
Fig. 4 illustrates the synoptic diagram according to the current compensation method 400 of an embodiment of the utility model;
Fig. 5 illustrates the synoptic diagram according to the current compensation method 500 of an embodiment of the utility model;
Fig. 6 illustrates the synoptic diagram according to the current compensation method 600 of an embodiment of the utility model;
Fig. 7 illustrates the schematic circuit diagram that produces circuit 700 according to the current signal of an embodiment of the utility model;
Fig. 8 illustrates the schematic circuit diagram according to the computing circuit 800 of an embodiment of the utility model;
Fig. 9 illustrates the schematic circuit diagram that produces circuit 900 according to the current signal of an embodiment of the utility model;
Figure 10 illustrates the synoptic diagram according to the current compensation method 1000 of an embodiment of the utility model;
Figure 11 illustrates the synoptic diagram according to the current compensation method 1100 of an embodiment of the utility model;
Figure 12 illustrates the schematic circuit diagram according to the current compensation circuit 1200 of an embodiment of the utility model;
Figure 13 illustrates the schematic circuit diagram according to the current compensation circuit 1200 of an embodiment of the utility model;
Figure 14 illustrates the schematic circuit diagram according to the current compensation circuit 1400 of an embodiment of the utility model;
Figure 15 illustrates the schematic circuit diagram according to the current compensation circuit 1500 of an embodiment of the utility model.
Embodiment
Specific embodiment hereinafter represents exemplary embodiment of the present utility model, and only unrestricted for the example explanation in essence.In the following description, in order to provide thorough understanding of the present utility model, a large amount of specific detail have been set forth.Yet it is evident that for those of ordinary skills: these specific detail are optional for the utility model.In other examples, for fear of obscuring the utility model, do not specifically describe known circuit, material or method.
In instructions, mention that " embodiment " or " embodiment " mean in conjunction with the described special characteristic of this embodiment, structure or characteristic to be included among at least one embodiment of the present utility model.Term " in one embodiment " each position in instructions occurs all not relating to identical embodiment, neither get rid of other embodiment or variable embodiment mutually.Disclosed all features in this instructions, or the step in disclosed all methods or the process except mutually exclusive feature and/or step, all can make up by any way.In addition, it should be understood by one skilled in the art that at this diagram that provides all be for illustrative purposes, and diagram is drawn in proportion not necessarily.Should be appreciated that when claiming " element " " to be connected to " or " coupling " during to another element it can be directly to connect or be couple to another element or can have intermediary element.On the contrary, when claiming element " to be directly connected to " or during " being directly coupled to " another element, not having intermediary element.Identical Reference numeral indication components identical.Term used herein " and/or " comprise any and all combinations of one or more relevant projects of listing.
Fig. 2 illustrates the current compensation circuit 200 according to an embodiment of the utility model.Current compensation circuit 200 comprises that temperature sense circuit 201, current signal produce circuit 202 and compensating circuit 203.Temperature current signal (compensating signal) 206 that current signal produces circuit 202 generations compensates the first current signal I1 with first temperature characterisitic, output current IO UT by compensating circuit 203.In one embodiment, suppose that the variable quantity of the first current signal I1 under a certain temperature variation is Δ I1, serviceability temperature sensor circuit 201 obtains the variation of temperature amount, current signal produces temperature current signal (or being called compensating current signal) the Δ IC1 that circuit 202 is given birth to according to the variation of temperature volume production and the absolute value of the variation delta I1 of the first current signal I1 is close, recycling compensating circuit 203 is that the first current signal I1 adds or deduct temperature current signal delta IC1, thereby obtains the output current that has nothing to do substantially with temperature.In another embodiment, suppose that the user expects that the variable quantity of the first current signal I1 under a certain temperature variation is Δ IE, the actual change amount of first current signal under this temperature is Δ I1, serviceability temperature sensor circuit 201 obtains the variation of temperature amount, current signal produces the temperature current signal delta IC2 that circuit 202 is given birth to according to the variation of temperature volume production and the difference of variable quantity expectation variation delta IE and actual change amount Δ I1 is close, recycling compensating circuit 203 is that the first current signal I1 adds or deduct temperature current signal delta IC2, thereby obtains being with temperature the output current of particular kind of relationship.
Current signal produces circuit 202 and has first input end, second input end and output terminal, and its first input end receives temperature signal 204, and its second input end receives reference current signal 205, according to setting relation, provides temperature current signal 206 at output terminal.In embodiment illustrated in fig. 2, temperature current signal 206 is used for the first current signal I1 that compensation has first temperature characterisitic.But those of ordinary skill in the art should be appreciated that temperature current signal 206 and also can be used for other purposes, and PTAT (raising with temperature) for example is provided electric current, IPTAT (reducing with temperature) electric current etc.
Can adopt multiple mode to realize that current signal produces circuit 202, for example adopt the method for simulation amplification, according to the temperature change Amplifier Gain.In one embodiment, current signal produces circuit 202 and comprises: first analog to digital conversion (ADC) circuit 2021, have input end and output terminal, and its input end receives temperature signal 204, output terminal provides the F position first digital signal 2023, and F for example is 6 or other numbers that are fit to; First digital-to-analog conversion (DAC) circuit 2022, have first input end, second input end and output terminal, its first termination is received F position first digital signal 2023, its second termination is received reference current signal 205, produces the 3rd current signal 206 based on F position first digital signal 2023 and reference current signal 205.
Fig. 3 illustrates the synoptic diagram according to the current compensation method 300 of an embodiment of the utility model.Among Fig. 3, horizontal ordinate is temperature, and the temperature range that industry is concerned about is generally-40～160 ℃, wherein following being limited to-25 of the temperature range be concerned about of certain fields ℃ or 0 ℃, on be limited to 85 ℃ or 125 ℃, representative temperature is 25 ℃ or 40 ℃.Ordinate is current value, temperature signal 204 is put on the electric current that produces on 1 ohm the ideal resistance and is showed in Fig. 3 and is beneficial to illustrate that temperature signal 204 is with variation of temperature.Temperature signal 204, after overcurrent signal produced circuit 202, the output terminal that produces circuit 202 at current signal provided current signal 301.In one embodiment, the temperature coefficient of current signal 301 is identical or approaching with the temperature coefficient essence of the first current signal I1.Through the processing of the compensating circuit 203 of level later, for example the first current signal I1 and current signal 301 are subtracted each other, thereby obtain current signal 302.Reason owing to the circuit precision; the temperature coefficient of the temperature coefficient of current signal 206 and the first current signal I1 may be variant; for example; current signal produces the circuit 202 actual current signals 303 that produce as shown in Figure 3; the actual current signal 304 that produces positive temperature coefficient (PTC) after over-compensation, these all are not break away from protection domain of the present utility model.
Fig. 4 illustrates the synoptic diagram according to the current compensation method 400 of an embodiment of the utility model.Temperature signal 204 after overcurrent signal produces circuit 202, provides temperature current signal 401 at output terminal.In one embodiment, temperature current signal 401 have with the first current signal I1 polarity opposite (positive and negative), the temperature coefficient that variable quantity essence is identical or approaching.Through the processing of the compensating circuit 203 of level later, for example with the first current signal I1 and current signal 206 additions, thereby obtain current signal 404.Reason owing to the circuit precision; the temperature coefficient of the temperature coefficient of current signal 401 and the first current signal I1 may be variant; for example current signal produces the circuit 202 actual current signals 403 that produce as shown in Figure 4; the actual current signal 404 that produces positive temperature coefficient (PTC) after over-compensation, these all are not break away from protection domain of the present utility model.
Fig. 5 illustrates the synoptic diagram according to the current compensation method 500 of an embodiment of the utility model.Coordinate system 501 illustrates temperature signal 204 with the variation of temperature characteristic, raises with temperature, and temperature signal 204 reduces gradually, and rate of decline slows down.First analog to digital conversion circuit 2021 is converted into 6 (example and unrestricted) digital signals with the temperature signal 204 of simulation.Suppose that first analog to digital conversion circuit 2021 is linear analog to digital converter (ADC), namely first digital signal 2023 is along with the voltage linear of temperature signal 204 changes.Specifically, the voltage threshold V501～V511 of a plurality of linear change shown in the coordinate system 501 (step-length equates in other words), when temperature signal 204 is between voltage threshold V501 and V502,2021 outputs 101001 of first analog to digital conversion circuit; When temperature signal 204 is between voltage threshold V502 and V503,2021 outputs 101000 of first analog to digital conversion circuit; When temperature signal 204 is between voltage threshold V510 and V511,2021 outputs 100000 of first analog to digital conversion circuit.Therefore, according to the magnitude of voltage of temperature signal 204, the different digital signal of first analog to digital conversion circuit, 2021 outputs under different temperature.Especially, example is and unrestricted, and when temperature was 21 ℃, the output signal of first analog to digital conversion circuit 2021 was 101001; When temperature was 23 ℃, the output signal of first analog to digital conversion circuit 2021 was 100101; When temperature was 25 ℃, the output signal of first analog to digital conversion circuit 2021 was 100011; When temperature was 27 ℃, the output signal of first analog to digital conversion circuit 2021 was 101001; When temperature was 29 ℃, the output signal of first analog to digital conversion circuit 2021 was 100000.Coordinate system 502 illustrates digital signal with variation of temperature, and along with temperature raises, digital signal progressively is decremented to 100000 by 101001, and the rate of decline of digital signal diminishes.Shown in coordinate system 503, the supplied with digital signal (first digital signal 2023) of first D/A converting circuit 2022 and the corresponding relation of output current signal (the 3rd current signal 206) are set, for example when first digital signal was 101001, the output current signal that first D/A converting circuit 2022 is set was A1; First digital signal is 100101, and the output current signal that first D/A converting circuit 2022 is set is A2; First digital signal is 100011, and the output current signal that first D/A converting circuit 2022 is set is A3; First digital signal is 101001, and the output current signal that first D/A converting circuit 2022 is set is A4; First digital signal is 100000, and the output current signal that first D/A converting circuit 2022 is set is A5, thereby obtains temperature variant current signal I5A.Because the reason of drawing, coordinate system do not have to show the output current when first digital signal 2023 is 101000,100111,100110,100100,100010.Equally, when first digital signal was 101001, the output current signal that first D/A converting circuit 2022 is set was B1; First digital signal is 100101, and the output current signal that first D/A converting circuit 2022 is set is B2; First digital signal is 100011, and the output current signal that first D/A converting circuit 2022 is set is B3; First digital signal is 101001, and the output current signal that first D/A converting circuit 2022 is set is B4; First digital signal is 100000, and the output current signal that first D/A converting circuit 2022 is set is B5, namely can obtain temperature variant current signal I5B.Under the instruction of above-described embodiment, thereby can also arranging different electric currents for the output of first D/A converting circuit 2022, those skilled in the art can obtain current signal I5C and I5D.Those skilled in the art should be realized that, though the current signal shown in the coordinate system 503 is with temperature linearity or level and smooth variation, but because the resolution of digital signal, electric current I 5A, I5B, I5C and I5D be with the stepped variation of temperature, shown in the coordinate system 503 be above-mentioned be to the current curve after the output current signal match of first D/A converting circuit 2022.Those skilled in the art can use several different methods that the corresponding relation of first digital signal and output current signal is set.For example, use non-linear D/A converting circuit, the temperature current signal is step change with described first digital signal with the integral multiple of described reference current signal 205, change and both to have comprised increases (positive integer doubly), reduce (negative integer doubly) and also comprise constant (zero times), step-length between the adjacent digital signal can be for just, can can be zero for negative.Adjacent step-length can equate, also can be unequal.Particularly, can be from zero to 100 microamperes receive peace (embodiment of reference current signal 205) every 10 10001 current values are set, utilize first digital signal 2023 therefrom to search and choose.Can also use the linear number analog conversion circuit, the temperature current signal is step change with first digital signal with reference current signal 205, and namely dull increase or dullness reduce.
Fig. 6 illustrates the schematic circuit diagram according to the current compensation method 600 of an embodiment of the utility model.Coordinate system 601 illustrates temperature signal 204 temperature variant characteristics, raises with temperature, and temperature signal 204 reduces gradually, and and rate of decline slowing down.First analog to digital conversion circuit 2021 is converted into 6 (example and unrestricted) digital signals with the temperature signal 204 of simulation.Suppose that first analog to digital conversion circuit 2021 is first digital signals 2023 that non-linear analog to digital converter (ADC) changes with temperature linearity in order to generation, namely first digital signal 2023 is along with temperature linearity changes.Specifically, a plurality of nonlinearities change shown in the coordinate system 501 (step-length is unequal in other words) voltage threshold V601～V611, the step-length of voltage threshold is directly proportional with the variation of temperature amount with temperature signal 204.When temperature signal 204 is between voltage threshold V601 and V602,2021 outputs 101001 of first analog to digital conversion circuit; When temperature signal 204 is between voltage threshold V602 and V603,2021 outputs 101000 of first analog to digital conversion circuit; When temperature signal 204 is between voltage threshold V610 and V611,2021 outputs 100000 of first analog to digital conversion circuit.Therefore, according to the magnitude of voltage of temperature signal 204, the different digital signal of first analog to digital conversion circuit, 2021 outputs under different temperature.Especially, example is and unrestricted, and when temperature was 21 ℃, the output signal of first analog to digital conversion circuit 2021 was 101001; When temperature was 22 ℃, the output signal of first analog to digital conversion circuit 2021 was 100100; When temperature was 30 ℃, the output signal of first analog to digital conversion circuit 2021 was 100000, i.e. the variation that the every generation of temperature is 1 ℃, and first digital signal 2023 reduces a step-length.Coordinate system 502 illustrates digital signal with variation of temperature, and along with temperature raises, digital signal progressively is decremented to 100000 by 101001, and digital signal with the temperature even variation.Shown in coordinate system 503, the supplied with digital signal (first digital signal) of first D/A converting circuit 2022 and the corresponding relation of output current signal (the 3rd current signal 206) are set, for example when first digital signal was 101001, the output current signal that first D/A converting circuit 2022 is set was C1; First digital signal is 100101, and the output current signal that first D/A converting circuit 2022 is set is C2; First digital signal is 100011, and the output current signal that first D/A converting circuit 2022 is set is C3; First digital signal is 101001, and the output current signal that first D/A converting circuit 2022 is set is C4; First digital signal is 100000, and the output current signal that first D/A converting circuit 2022 is set is C5, thereby obtains temperature variant current signal I6A.Because the reason of drawing, coordinate system do not have to show the output current when first digital signal is 101000,100111,100110,100100,100010.Equally, when first digital signal was 101001, the output current signal that first D/A converting circuit 2022 is set was D1; First digital signal is 100101, and the output current signal that first D/A converting circuit 2022 is set is D2; First digital signal is 100011, and the output current signal that first D/A converting circuit 2022 is set is D3; First digital signal is 101001, and the output current signal that first D/A converting circuit 2022 is set is D4; First digital signal is 100000, and the output current signal that first D/A converting circuit 2022 is set is D5, namely can obtain temperature variant current signal I6B.Under the instruction of above-described embodiment, thereby can also arranging different electric currents for the output of DAC, those skilled in the art can obtain for example current signal I6C and I6D.Those skilled in the art should be realized that, though the current signal shown in the coordinate system 503 is with temperature linearity or level and smooth variation, but because the resolution of digital signal, electric current I 6A, I6B, I6C and I6D be with the stepped variation of temperature, shown in the coordinate system 503 be above-mentioned be with the current curve after the output current match of first D/A converting circuit 2022.Those skilled in the art can use several different methods that the corresponding relation of first digital signal and output current signal is set, and for example receives to install every 10 from zero to 100 microamperes and puts 10001 current values, utilizes first digital signal therefrom to choose.In a special embodiment, can adopt F figure place linear number weighted-voltage D/A converter (DAC) to obtain the electric current that changes with temperature linearity, for example I6A or I6C.At this moment, owing to digital signal changes with temperature linearity, because the output signal of linear DAC changes with digital signal is linear.Therefore, the output signal of linear DAC changes with temperature linearity.Because reference current signal itself has temperature characterisitic, the output signal of acquisition and theoretical value can be variant, but do not break away from protection domain of the present utility model.
Example and unrestricted when temperature signal 204 changes with temperature linearity, can adopt linear ADC and linear DAC simultaneously, thereby obtains to raise or reduce offset current with temperature linearity.Linear and the non-linear whole input range of ADC and DAC that both can make also can make the part input.For example, same ADC and DAC both can have linearity and non-linear partial.Suppose that at first electromotive force be 5V, second electromotive force is zero, when the temperature of user's care is 0～25 ℃ of variation, temperature signal be changed to 2V from 3.2V with temperature linearity, in order to obtain high as far as possible resolution, when using six ADC and DAC, use can the step-length in 0～2V be set to 1V, step-length between 2V～3.2V is set to 20mV, and the step-length between 3.2V～5V arranges 0.9V, thus voltage range and the higher resolution of temperature range setting be concerned about for the user.
Fig. 7 illustrates the schematic circuit diagram that produces circuit 700 according to the current signal of an embodiment of the utility model.Current signal produces circuit 700 and has first input end, second input end and output terminal, its first input end receives temperature signal 204, its second input end received current signal 705 (being reference current signal 205 in one embodiment) provides current signal 706 (being the temperature current signal in one embodiment) at output terminal.Current signal produces circuit 700 and comprises analog to digital converter 701 and digital to analog converter 702.
Analog to digital converter 701 comprises first comparer 7011, has first end, second end and output terminal, its first termination shrinkage temperature signal 204, and output terminal provides first status signal 7013; Logic with shift circuit 7012, have first input end, second input end, first output terminal and second output terminal, its first input end receives first status signal 7017, its second input end receive clock signal Clock, its first output terminal provides first digital signal 7014, its second output terminal provides first logical signal 7015, when first status signal 7017 is first level (for example high level), and first logical signal, 7015 carries (for example changing 100001 into by 100000); When first status signal 7013 is second level (for example low level), first logical signal 7015 give up the throne (for example changing 011111 into by 100000); Second digital to analog converter 7013 comprises input end and output terminal, and its input end receives first logical signal 7015, and second end that its output terminal provides threshold signal 7016 to first comparers 7011 is threshold value as a comparison.
In one embodiment, in the middle of first logical signal 7015 of logic with shift circuit 7012 at first is arranged near the scale (for example 100000).Like this, the threshold signal 7016 of second digital to analog converter, 7013 outputs is set as near the VREF/2, and wherein VREF provides the reference voltage to second analog to digital converter 7013, can be the poor of the first electromotive force V1 and the second electromotive force V2.Then, first comparer 7011 judges that temperature signal 204 is less than or greater than threshold signal 7016.If temperature signal 204 is greater than threshold signal 7016, first comparer, 7011 output logic high level then, logical signal 7015 carries (for example changing 100001 into by 100000) of logic with shift circuit 7012.On the contrary, if temperature signal 204 less than threshold signal 7016, the logical signal 7015 of logic with shift circuit 7012 give up the throne (for example changing 011111 into by 100000).Compare repeatedly, until the upper threshold value that searches out temperature signal 204 (minimum threshold that is higher than temperature signal 204) and lower threshold value (being lower than the max-thresholds of temperature signal 204), then logical signal 7015 will switch between two digital signals.In one embodiment, first output terminal of logic with shift circuit 7012 can directly be exported the signal of second output terminal, and namely logical signal 7015 is the identical signals of essence with first digital signal 7014.In another embodiment, for fear of " logical signal 7015 will switch between two digital signals ", can behind logical signal, couple a latch, when " logical signal 7015 will switch between two digital signals ", select one of them digital signal of output as first digital signal 7014, current signal as shown in Figure 9 produces circuit 900.In other embodiment, can also carry out operation such as coding and decoding back as 7014 outputs of first digital signal to logical signal 7015.
Fig. 8 illustrates according to the schematic circuit diagram of second analog to digital converter 800 of an embodiment of the utility model and coordinate system 601.Digital to analog converter 800 comprises multipurpose switch 802 and resistance string 801, and multipurpose switch 802 selects the component voltage of resistance string to offer second end of first comparer 7011 as threshold value under the control of input signal (for example logical signal 7015).Resistance string 801 is coupled between the first electromotive force V1 and the second electromotive force V2, comprises a plurality of sub-resistances 8010,8011 ... 8017,8018.If the resistance of all or part of sub-resistance equates, then can obtain the linear ADC shown in the coordinate system 501 (being that analog to digital converter 701 is linear ADC).Can obtain non-linear ADC (being that analog to digital converter 701 is non-linear ADC) if the resistance of sub-resistance is unequal.Especially in one embodiment, the resistance of resistance is to arrange according to the relation of temperature signal 204 with temperature.For example, the resistance of the sub-resistance of resistance string 801 distributes with temperature signal along with the variation of temperature amount is proportional, thereby obtain the component voltage that equates with the threshold voltage V601～V607 shown in the coordinate system 601 at the tie point of each sub-resistance, and then make the digital signal that changes with temperature linearity shown in the analog to digital converter 701 output coordinate systems 601.Digital-to-analogue converter 702 receives the digital signal that changes with temperature linearity, and the current signal 706 that its output terminal provides is that step-length is followed digital signal and increased progressively or successively decrease with reference current signal 705, thereby obtains current signal I6A or the I6C shown in the modular system 603.The linearity of resistance and the non-linear linearity that comprises part resistance and non-linear, and whole linearities of resistance and non-linear.
Digital to analog converter 702 comprises first input end, second input end and output terminal, and its first input end receives first digital signal 7014, and its second input end receives reference current signal 703, and output terminal provides current signal 706.In one embodiment, digital to analog converter 702 comprises the linear DAC with figure place identical with first digital signal 7014, and reference current signal 703 is step-lengths of the variation of output current signal 706.Output current signal 706 produces as shown in Figure 6 current signal I6A and I6C along with the variation of first digital signal, 7014 linearities.
Fig. 9 illustrates the schematic circuit diagram that produces circuit 900 according to the current signal of an embodiment of the utility model.Current signal produces circuit 900 and comprises analog to digital converter 901 and digital to analog converter 702.Advance and retreat position circuit 9012 and latch 9014 can be used as an embodiment who realizes logic with shift circuit 7012.Advance and retreat circuit 9012, have first input end, second input end, output terminal, its first input end receives first status signal 7017, its second input end receive clock signal Clock, its output terminal is configured to second output terminal of logic with shift circuit 7012 with first logical signal 7015, when described first status signal 7017 is first level, No. 7015 carries of first logic letter; When first status signal 7017 was second level, first logical signal 7015 was given up the throne.Latch 9014, have input end and output terminal, its input end is coupled to the output terminal (being second output terminal of logic with shift circuit 7012) of advance and retreat circuit 9012 to receive described first logical signal 7015, its output terminal is coupled to or is configured to first output terminal of described logic with shift circuit 7012, when first logical signal switched between adjacent digital signal back and forth, latch 9014 was selected in the described adjacent digital signal of output.
Those skilled in the art's expectation can obtain and be had the compensating current signal of identical temperature coefficient by compensating signal, thereby reaches good compensation effect.But the unrestricted reason owing to following example, for example, distance between temperature sensing circuit 201 and the actual thermal source, the error of temperature sensing circuit 201 itself can be caused always being difficult to obtain obtaining desired effects by compensating signal because of the reasons such as unexpected variation that environmental change (for example humidity, pressure, distance, wind direction, thermal gradient etc.) produces.
Figure 10 illustrates the synoptic diagram according to the current compensation method 1000 of an embodiment of the utility model.Among Figure 10, current signal produces circuit and produces compensating current signal 1002 according to temperature signal 1001.But owing to the reason (for example change of sensitive characteristic) of temperature sense circuit, actual produce temperature signal 1002 as shown in the figure, and then produced compensating current signal 1004.Certainly, owing to different reasons also may produce compensating signal 1005,1006 etc.According to the instructions instruction, as shown in Figure 2, offset current directly depends on first digital signal 2023.For this reason, can adjust the output signal of first D/A converting circuit 2022 by the input signal that changes first D/A converting circuit 2022 by first digital signal 2023 is added or deduct a digital regulating signal.
Figure 11 illustrates the synoptic diagram according to the current compensation method 1100 of an embodiment of the utility model.As shown in figure 11, current signal 1101 is output current signals that expectation obtains, current signal 1102 is output current signals of actual acquisition, by first digital signal being deducted a stationary digital signal 000010, make the output current signal of D/A converting circuit 2022 that variation also take place accordingly, thereby obtained current signal 1103.As shown in figure 11, be between 20～30 ℃ in temperature, current signal 1103 obviously levels off to the current signal 1101 of expectation more than current signal 1102.The improvement of temperature characterisitic can be embodied in a certain temperature range or a certain temperature spot on more close to expectation numerical value.In other embodiment, can also be by first digital signal being added a stationary digital signal, thus change output current signal.As can be seen from Figure 11, with electric current upwards or the current signal 1103 that obtains after the translation downwards temperature higher or lower in still with the current signal 1101 of expectation big gap is arranged.Therefore, can different temperature additions or subtract each other different digital signals so that the actual compensating signal that produces close to the output current signal 1101 of expectation.In one embodiment, can make the digital signal of monotone variation, for example raise with temperature, perhaps raising with temperature reduces.In one embodiment, can in the time of 20 ℃, deduct 000011, when the TO temperature, deduct digital signaling zero 00010, in the time of 30 ℃, deduct 000001, to produce current signal 1104.Thereby obtain the The optimal compensation effect 0 time in temperature T, when being higher than or be lower than the T0 temperature, compare current signal 1103, current signal 1104 approaches the current signal 1101 with expectation more.
Figure 12 illustrates the schematic circuit diagram according to the current compensation circuit 1200 of an embodiment of the utility model.Compensating circuit 1200 comprises that temperature sense circuit 201, current signal produce circuit 1202 and compensating circuit 203.Current signal produces circuit 1202, also comprise computing circuit 12021, comprise first output terminal, second input end and output terminal, its first input end receives first digital signal, its second input end receives S position conditioning signal 1207, after first digital signal and conditioning signal addition or subtracting each other, provides second digital signal 12022 at output terminal.In other embodiment, computing circuit can also multiply each other first digital signal and conditioning signal or be divided by.First D/A converting circuit 2022 produces output current signal based on second digital signal and reference current signal 205.Wherein conditioning signal 1207 both can be the digital signal of fixing, and also can be the digital signal of linearity or nonlinearities change.
Digital regulating signal can be provided by digital signals such as MCU, CPU, I2C, also can be provided by integrated or external analog to digital conversion circuit.
Figure 14 illustrates the schematic circuit diagram according to the current compensation circuit 1400 of an embodiment of the utility model.Current compensation circuit 1400 comprises that current compensation circuit 1200, conditioning signal produce circuit 1401 and second analog to digital converter 1402.In one embodiment, in one embodiment, conditioning signal produces circuit 1401 and comprises the 3rd resistance R 3, has first end and second end, and its first end is coupled to the 3rd electromotive force V3, and its second end provides analog regulation signal 1404; The 4th resistance R 4 has first end and second end, and its first end is coupled to second end of the 3rd resistance R 3, and its second end is coupled to the 4th electromotive force V4; Second analog to digital conversion (ADC) circuit 1402 has input end and output terminal, and its input end receives analog regulation signal 1404, and output terminal provides S bit digital conditioning signal 1207.
Figure 15 illustrates the schematic circuit diagram according to the current compensation circuit 1500 of an embodiment of the utility model.Current compensation circuit 1500 also comprises a scrambler 1501, couple and second analog to digital conversion (ADC) circuit 1402 and computing circuit 12021 between, have input end and output terminal, its input end receives the output signal (called after three digital signal in one embodiment) of second analog to digital conversion (ADC) circuit 1402, output terminal provides with temperature monotone decreasing or the S bit digital conditioning signal 1207 that increases progressively, for example this digital regulating signal can be by MCU, CPU, digital signals such as I2C provide, also can be provided by integrated or external analog to digital conversion circuit, and this digital regulating signal raises with temperature according to setting in advance, and perhaps raising with temperature reduces.In one embodiment, scrambler 1501 can be made different increases to three digital signal or reduce under different temperature.In another embodiment, under the same temperature, when three digital signal was in different numerical value, scrambler 1501 can be made different increases or reduces three digital signal.Current compensation circuit 1500 can produce current signal 1103 as shown in figure 11, owing to used the conditioning signal of monotone variation, for example raise with temperature, perhaps raising with temperature reduces, can so that in a certain temperature range or the temperature current signal 1104 that obtains of a certain temperature spot more close to desired temperatures current signal 1101.
Although the utility model is described in conjunction with its concrete illustrative embodiments, it should be apparent that, multiple alternative, revise and distortion is apparent for those skilled in the art.Thus, be schematically and also non-limiting in this illustrative embodiments of the present utility model of illustrating.Can under the situation that does not break away from spirit and scope of the present utility model, modify.
Employed measure word " one ", " a kind of " etc. do not get rid of plural number in this disclosure." first " in the literary composition, " second " etc. only are illustrated in the sequencing that occurs in the description of embodiment, so that distinguish like." first ", " second " appearance in claims are only for the ease of to the fast understanding of claim rather than in order to limit it.Any Reference numeral in claims all should not be construed as the restriction to scope.
Claims (22)
1. a current signal produces circuit, it is characterized in that, comprising:
First analog to digital conversion circuit has input end and output terminal, and its input end receives temperature variant temperature signal, and its output terminal provides first digital signal; And
First D/A converting circuit, have first input end, second input end and output terminal, its first input end receives described first digital signal, its second input end receives reference current signal, provides the temperature current signal that is the relation of setting with temperature at its output terminal based on described first digital signal and described reference current signal.
2. current signal according to claim 1 produces circuit, it is characterized in that described temperature signal is by the temperature sense circuits sense, and described temperature sense circuit comprises:
First resistance has first end and second end, and its first end is coupled to first electromotive force, and its second end provides described temperature signal; And
Second resistance has first end and second end, and its first end is coupled to second end of described first resistance, and its second end is coupled to second electromotive force, and described second resistance has different temperature characterisitics with described first resistance.
3. current signal according to claim 2 produces circuit, it is characterized in that described second resistance is negative temperature characteristic resistance, and described first resistance is that positive temperature coefficient resistor or temperature coefficient are less than the resistance of the temperature coefficient of described second resistance.
4. current signal according to claim 1 produces circuit, it is characterized in that described first digital signal changes with temperature linearity.
5. current signal according to claim 1 produces circuit, it is characterized in that, described first modulus is walked around and changed circuit and comprise:
First comparer has first input end, second input end and output terminal, and its first termination is received described temperature signal, and output terminal provides first status signal;
The logic with shift circuit, have first input end, second input end, first output terminal and second output terminal, its first input end receives described first status signal, its second input end receive clock signal, its first output terminal provides described first digital signal, its second output terminal provides first logical signal, the described first logical signal carry when described first status signal is first level, and described first logical signal is given up the throne when first status signal is second level; And
Second D/A converting circuit has input end and output terminal, and its input end is coupled to second end of described logic with shift circuit to receive described first logical signal, and its output terminal is coupled to second end of described first comparer so that threshold voltage signal to be provided.
6. current signal according to claim 5 produces circuit, it is characterized in that described second D/A converting circuit is non-linear D/A converting circuit, and comprises:
Resistance string comprises resistance that a plurality of resistances do not wait producing a plurality of component voltages, and the resistance of wherein said resistance is that the relation according to described temperature signal and temperature arranges; And
Multipurpose switch, one under described first logical signal control in the described a plurality of component voltages of selection to provide described threshold voltage signal.
7. current signal according to claim 5 produces circuit, it is characterized in that described first digital signal is the identical signal of essence with described first logical signal.
8. current signal according to claim 5 produces circuit, it is characterized in that, described logic with shift circuit also comprises latch, have input end and output terminal, its input end is coupled to second output terminal of described logic with shift circuit to receive described first logical signal, its output terminal is coupled to or is configured to first output terminal of described logic with shift circuit, when described first logical signal switched between adjacent digital signal back and forth, described latch was selected in the described adjacent digital signal of output.
9. current signal according to claim 1 produces circuit, it is characterized in that, described first D/A converting circuit is non-linear number analog conversion circuit, and described temperature current signal is step change with described first digital signal with the integral multiple of described reference current signal.
10. current signal according to claim 1 produces circuit, it is characterized in that described first D/A converting circuit is the linear number analog conversion circuit, and described temperature current signal is step change with described first digital signal with described reference current signal.
11. current signal according to claim 1 produces circuit, it is characterized in that, also comprise a computing circuit, have first input end, second input end and output terminal, its first input end is coupled to the output terminal of described first analog to digital conversion circuit to receive described first digital signal, its second input end receives a digital regulating signal, and described computing circuit is adjusted described first digital signal and provided second digital signal at its output terminal based on described digital regulating signal;
Described first D/A converting circuit produces described temperature current signal based on described second digital signal and described reference current signal.
12. current signal according to claim 11 produces circuit, it is characterized in that, described second digital signal is described first digital signal and described digital regulating signal sum or is the poor of described first digital signal and described digital regulating signal.
13. current signal according to claim 5 produces circuit, it is characterized in that, also comprise a computing circuit, have first input end, second input end and output terminal, its first input end is coupled to second output terminal of described logic with shift circuit to receive described first logical signal, its second input end receives a digital regulating signal, and described computing circuit is adjusted described first logical signal and provided second logical signal at its output terminal based on described digital regulating signal;
The input end of described second D/A converting circuit is coupled to the output terminal of described computing circuit to receive described second logical signal, and its output terminal is coupled to second end of described first comparer so that threshold voltage signal to be provided.
14. current signal according to claim 13 produces circuit, it is characterized in that, described second logical signal is described first logical signal and described digital regulating signal sum or is the poor of described first logical signal and described digital regulating signal.
15. produce circuit according to claim 11 or 13 described current signals, it is characterized in that described digital regulating signal is fixing digital signal.
16. produce circuit according to claim 11 or 13 described current signals, it is characterized in that described digital regulating signal is temperature variant digital signal.
17. produce circuit according to claim 11 or 13 described current signals, it is characterized in that described digital regulating signal is provided by CPU or MCU or I2C circuit.
18. produce circuit according to claim 11 or 13 described current signals, it is characterized in that, also comprise:
Conditioning signal produces circuit, is coupled between the 3rd electromotive force and the 4th electromotive force, and the analog regulation signal is provided;
Second analog to digital conversion circuit has input end and output terminal, and its input end is coupled to described conditioning signal and produces circuit to receive described analog regulation signal, and its output terminal provides described digital regulating signal.
19. produce circuit according to claim 11 or 13 described current signals, it is characterized in that, also comprise:
Conditioning signal produces circuit, is coupled between the 3rd electromotive force and the 4th electromotive force, and the analog regulation signal is provided;
Second analog to digital conversion circuit has input end and output terminal, and its input end is coupled to described conditioning signal and produces circuit to receive described analog regulation signal, and its output terminal provides three digital signal;
Scrambler has input end and output terminal, and its input end is coupled to the output terminal of described second analog to digital conversion circuit to receive described three digital signal, and its output terminal provides described digital regulating signal, and wherein said digital regulating signal is with the temperature monotone variation.
20. current signal according to claim 1 produces circuit, it is characterized in that, this current signal produces circuit and is used for compensation first current signal, and described first current signal and described temperature signal are by a compensating circuit addition or subtract each other.
21. the current compensator that current signal is compensated is characterized in that, comprising:
Analog to digital conversion circuit has input end and output terminal, and its input end is coupled to the temperature sense circuit to receive temperature variant temperature signal, and its output terminal provides first digital signal;
D/A converting circuit, have first input end, second input end and output terminal, its first input end receives described first digital signal, its second input end receives reference current signal, provides the temperature current signal that is the relation of setting with temperature at its output terminal based on described first digital signal and described reference current signal; And
Compensating circuit, have first input end, second input end and output terminal, its first input end receives described temperature current signal, its second input end receives current signal to be compensated, described compensating circuit provides output current signal with described temperature current signal and described current signal addition to be compensated/subtract at output terminal.
22. current compensator according to claim 21 is characterized in that, described temperature signal is by the temperature sense circuits sense, and described temperature sense circuit comprises:
First resistance has first end and second end, and its first end is coupled to first electromotive force, and its second end provides described temperature signal; And
Second resistance has first end and second end, and its first end is coupled to second end of described first resistance, and its second end is coupled to second electromotive force, and described second resistance has different temperature characterisitics with described first resistance.
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| CN 201320071292 CN203070145U (en) | 2013-02-07 | 2013-02-07 | Current signal generating circuit and current compensating device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103197713A (en) * | 2013-02-07 | 2013-07-10 | 成都芯源系统有限公司 | Current signal generating circuit and current compensating device |
| CN111257617A (en) * | 2020-01-19 | 2020-06-09 | 苏州英威腾电力电子有限公司 | Multi-power-section voltage and current sampling method, device and system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103197713A (en) * | 2013-02-07 | 2013-07-10 | 成都芯源系统有限公司 | Current signal generating circuit and current compensating device |
| CN103197713B (en) * | 2013-02-07 | 2015-04-15 | 成都芯源系统有限公司 | Current signal generating circuit and current compensating device |
| CN111257617A (en) * | 2020-01-19 | 2020-06-09 | 苏州英威腾电力电子有限公司 | Multi-power-section voltage and current sampling method, device and system |
| CN111257617B (en) * | 2020-01-19 | 2022-08-05 | 苏州英威腾电力电子有限公司 | Multi-power-section voltage and current sampling method, device and system |
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