CN111736651A - Temperature compensation constant current source circuit and temperature compensation method - Google Patents
Temperature compensation constant current source circuit and temperature compensation method Download PDFInfo
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- CN111736651A CN111736651A CN202010456829.8A CN202010456829A CN111736651A CN 111736651 A CN111736651 A CN 111736651A CN 202010456829 A CN202010456829 A CN 202010456829A CN 111736651 A CN111736651 A CN 111736651A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/565—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor
- G05F1/567—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for temperature compensation
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Abstract
The invention discloses a temperature compensation constant current source circuit and a temperature compensation method in the field of temperature compensation, and the temperature compensation constant current source circuit comprises a constant current source main circuit, a first-stage temperature compensation module and a second-stage temperature compensation module, wherein the first-stage temperature compensation module comprises a first resistor and a second resistor which are connected with the constant current source main circuit, and the first resistor and the second resistor are connected in parallel and have different temperature coefficients; the second-stage temperature compensation module comprises an adjustable current source, an A/D converter, a single chip microcomputer and a temperature measurement circuit which are sequentially connected, and the adjustable current source is connected with the constant current source main circuit. The invention adopts a mode of carrying out two-stage compensation step by step, firstly carries out coarse compensation through the first-stage temperature compensation module, can enable the temperature coefficient of the constant current source to reach within 5 ppm/DEG C, and then carries out fine compensation through the second-stage temperature compensation module, can enable the temperature coefficient of the constant current source to reach within 0.5 ppm/DEG C, and greatly improves the compensation efficiency and the compensation precision of the main circuit of the constant current source.
Description
Technical Field
The invention relates to the field of temperature compensation, in particular to a temperature compensation constant current source circuit and a temperature compensation method.
Background
The constant current source is an important module in a digital-analog hybrid integrated circuit, has the function of providing a constant output current irrelevant to power supply voltage for a system, and is widely applied to various occasions such as initiating explosive devices, current/frequency conversion and the like. Because the device characteristics are influenced by temperature changes and the like, the precision of the constant current source circuit is reduced to a certain extent in the full temperature range, and the increasing performance requirements of the whole machine are difficult to meet.
The current better solution is to use a constant temperature bath or a refrigerator to make the core part of the constant current source work at a constant temperature, but the method makes the control circuit complex and the whole power consumption requirement large, which is not beneficial to the application requirement of the whole machine. There are also schemes for compensating in real time by means of device temperature characteristics or monitoring temperature, but due to its single compensation form or complex compensation process, there are also problems that compensation efficiency is low or it is difficult to achieve ideal compensation accuracy. Therefore, there is a need to improve the current technical problem to improve the temperature compensation efficiency and compensation accuracy of the constant current source.
Disclosure of Invention
The present invention is directed to a temperature compensation constant current source circuit and a temperature compensation method, so as to solve the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme:
a temperature compensation constant current source circuit comprises a constant current source main circuit, a first-stage temperature compensation module and a second-stage temperature compensation module, wherein the first-stage temperature compensation module comprises a first resistor and a second resistor which are connected with the constant current source main circuit, and the first resistor and the second resistor are connected in parallel and have different temperature coefficients; the second-stage temperature compensation module comprises an adjustable current source, an A/D converter, a single chip microcomputer and a temperature measurement circuit which are sequentially connected, and the adjustable current source is connected with the constant current source main circuit.
As a modified scheme of the invention, the first resistor is a temperature compensation resistor, and the second resistor is a high-precision resistor.
A temperature compensation method of a temperature compensation constant current source circuit is characterized in that a constant current source main circuit obtains an output current approaching to a zero temperature compensation coefficient through a first-stage temperature compensation module; a temperature measuring circuit in the second-stage temperature compensation module collects circuit temperature points of the constant current source main circuit, the single chip microcomputer inquires corresponding compensation voltage of the circuit temperature points on the quantization relation table, digital-to-analog conversion of the A/D converter is controlled, and then the adjustable current source is controlled to output compensation current.
As an improved scheme of the present invention, the step of obtaining the quantization relation table of the second-stage temperature compensation module is:
s1: setting an initial temperature point of the incubator, placing the constant current source main circuit into the incubator, changing the internal temperature of the incubator from the initial temperature point, and testing the output current of the constant current source circuit at each temperature point;
s2: testing the output current of the constant current source circuit at each temperature point after being compensated by the first-stage temperature compensation module, and recording and storing the compensation voltage value and the temperature value data of the first-stage temperature compensation module;
s3: the singlechip outputs the voltage converted by the A/D converter as compensation voltage, converts the voltage into compensation current through the series resistor, enables the constant current source to reach a target current value, and records and stores compensation voltage value and temperature value data;
s4: and (4) sorting the compensation voltage value and temperature value data recorded and stored in S2 and S3 into a quantitative relation table of the compensation voltage value and the temperature by an interpolation method, and writing the quantitative relation table into a single chip microcomputer program.
Has the advantages that: the invention adopts a mode of carrying out two-stage compensation step by step, firstly carries out coarse compensation through the first-stage temperature compensation module, can enable the temperature coefficient of the constant current source in the whole temperature working interval (-45 ℃ to +85 ℃) to reach within 5 ppm/DEG C, and then carries out fine compensation through the second-stage temperature compensation module, can enable the temperature coefficient of the constant current source in the whole temperature working interval (-45 ℃ to +85 ℃) to reach within 0.5 ppm/DEG C, thereby greatly improving the compensation efficiency and the compensation precision of the main circuit of the constant current source.
Drawings
FIG. 1 is a functional block diagram of the present invention;
FIG. 2 is a schematic circuit diagram of the main circuit of the constant current source of the present invention;
FIG. 3 is a temperature coefficient comparison graph before and after compensation of the constant power supply main circuit of the present invention;
FIG. 4 is a diagram illustrating the steps of obtaining a quantization table according to the present invention;
fig. 5 is a comparison graph of the output current temperature coefficient of the constant current source before and after the second stage of temperature compensation.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 2, the main circuit of the constant current source includes an operational amplifier U1 and a composite driving tube connected to the output terminal of the operational amplifier U1, the non-inverting input terminal of the operational amplifier U1 provides a reference voltage through a reference circuit, and the inverting input terminal thereof is connected to the composite driving tube. The first-stage temperature compensation module forms a sampling resistor, converts the output current of the constant current source main circuit into sampling voltage, compares the sampling voltage with reference voltage, and compares the sampling voltage with the reference voltage, and the amplified signal pushes the composite driving tube to adjust the output current, so that the output current has more stability by using the negative feedback of the operational amplifier, and finally the output current is constant. The operational amplifier U1 generally uses a low-noise high-precision operational amplifier such as OP 77. The composite driving tube is composed of a PNP triode Q1 and a P-channel junction field tube Q2, the Q1 and the Q2 can be optimally selected according to the current of a constant current source, for example, a PNP triode of a 50mA constant current source can adopt a low-noise medium-power triode such as 3CK3D, and the Q2 can select 2N5460A with small leakage current.
The composite tube has strong driving capability, meets the driving power requirement of the operational amplifier U1, and enables the operational amplifier U1 to work normally without overlarge driving capability.
Preferably, the first resistor is a temperature compensation resistor having a negative temperature coefficient, and the second resistor is a high precision resistor having a positive temperature coefficient. As shown in fig. 3, because the temperature coefficients of the first resistor and the second resistor are different, a compensated resistor approaching to a zero temperature coefficient can be obtained, and the first resistor and the second resistor form a sampling resistor to convert the output current of the constant current source main circuit into a sampling voltage, so that the sampling voltage compensated by the first-stage temperature compensation module approaches to the zero temperature coefficient, and the output current of the constant current source main circuit approaches to the zero temperature coefficient, thereby achieving the effect of coarse compensation. Because the high-precision resistance of the first-stage temperature compensation module has positive drift of about 40ppm in the whole temperature working interval (-45 ℃ to +85 ℃), the reduced negative drift of the second resistance in the whole temperature working interval is about 40ppm, the positive and negative of the second resistance are balanced, and the output current can approach to zero temperature coefficient, the temperature coefficient of the constant current source in the whole temperature working interval (-45 ℃ to +85 ℃) can easily reach within 5 ppm/DEG C after temperature compensation by the first-stage temperature compensation module even considering the influence of temperature drift of other elements and circuits.
The second-stage temperature compensation module comprises an adjustable current source, an A/D converter, a single chip microcomputer and a temperature measurement circuit which are sequentially connected, and the adjustable current source is connected with the constant current source main circuit.
Specifically, the main circuit of the constant current source obtains an output current approaching to a zero temperature compensation coefficient through a first-stage temperature compensation module; a temperature measuring circuit in the second-stage temperature compensation module collects circuit temperature points of the constant current source main circuit, the single chip microcomputer inquires corresponding compensation voltage of the circuit temperature points on the quantization relation table, digital-to-analog conversion of the A/D converter is controlled, and then the adjustable current source is controlled to output compensation current. Because the resolution ratio output by the A/D converter is very high and can reach 0.001V, the influence of the output compensation voltage on the main current is relatively insensitive, the resolution ratio output by the A/D converter only needs 0.1V generally, and the resolution ratio output by the A/D converter can completely realize the high-precision compensation requirement, the temperature coefficient of the constant current source can reach within 0.5 ppm/DEG C or even higher after the temperature compensation of the second-stage temperature compensation module, if the first compensation is not in place, the second correction compensation can be carried out, only the compensation data of the compensation table needs to be changed, the program is re-recorded, and the operation is easy.
That is, in this embodiment, the order and compensation accuracy of the two-stage compensation method are adopted, the first-stage coarse temperature compensation is performed first, and then the second-stage fine temperature compensation is performed, so that the temperature compensation effect of the main circuit of the constant current source can be controlled more easily and accurately, and the temperature characteristic of the main circuit of the constant current source is improved.
As shown in fig. 4, the step of obtaining the quantization relation table of the second-stage temperature compensation module includes:
s1: setting an initial temperature point of the incubator, placing the constant current source main circuit into the incubator, changing the internal temperature of the incubator from the initial temperature point, and testing the output current of the constant current source circuit at each temperature point;
further, the temperature was maintained at this temperature for 10 minutes at intervals of 10 ℃.
S2: testing the output current of the constant current source circuit at each temperature point after being compensated by the first-stage temperature compensation module, and recording and storing the compensation voltage value and the temperature value data of the first-stage temperature compensation module;
s3: the singlechip outputs the voltage converted by the A/D converter as compensation voltage, the voltage is converted into compensation current by serially connecting resistors, so that the constant current source reaches a target current value, the target current value is determined according to design indexes, if the designed current is 50mA, the target current value is 50mA, and then compensation voltage value and temperature value data are recorded and stored;
s4: and (4) sorting the compensation voltage value and the temperature value data recorded and stored in S2 and S3 by an interpolation method to form a quantitative relation table of the compensation voltage value and the temperature with the resolution of 0.1 ℃, and writing the quantitative relation table into a single chip microcomputer program.
Specifically, as shown in fig. 5, for comparison of the temperature coefficients of the output currents of the constant current sources before and after the second-stage temperature compensation, it can be seen that the temperature coefficient of the output current of the constant current source is extremely increased.
Although the present description is described in terms of embodiments, not every embodiment includes only a single embodiment, and such description is for clarity only, and those skilled in the art should be able to integrate the description as a whole, and the embodiments can be appropriately combined to form other embodiments as will be understood by those skilled in the art.
In the description of the present invention, it should be noted that relational terms such as first and second, and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In the description of the present invention, it should be further noted that the terms "upper", "lower", "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally put in use of products of the present invention, which are merely for convenience of description and simplification of description, but do not indicate or imply that the referred devices or elements must have specific orientations, be constructed in specific orientations, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Therefore, the above description is only a preferred embodiment of the present application, and is not intended to limit the scope of the present application; all changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (4)
1. A temperature compensation constant current source circuit is characterized by comprising a constant current source main circuit, a first-stage temperature compensation module and a second-stage temperature compensation module, wherein the first-stage temperature compensation module comprises a first resistor and a second resistor which are connected with the constant current source main circuit, the first resistor and the second resistor are connected in parallel, and the temperature coefficients are different; the second-stage temperature compensation module comprises an adjustable current source, an A/D converter, a single chip microcomputer and a temperature measurement circuit which are sequentially connected, and the adjustable current source is connected with the constant current source main circuit.
2. The temperature-compensated constant current source circuit according to claim 1, wherein the first resistor is a temperature-compensated resistor and the second resistor is a high-precision resistor.
3. The temperature compensation method of the temperature compensation constant current source circuit according to claim 1, wherein the constant current source main circuit obtains an output current approaching to a zero temperature compensation coefficient through a first-stage temperature compensation module; a temperature measuring circuit in the second-stage temperature compensation module collects circuit temperature points of the constant current source main circuit, the single chip microcomputer inquires corresponding compensation voltage of the circuit temperature points on the quantization relation table, digital-to-analog conversion of the A/D converter is controlled, and then the adjustable current source is controlled to output compensation current.
4. The method for compensating the temperature of the temperature-compensated constant current source circuit according to claim 3, wherein the step of obtaining the quantization relation table of the second-stage temperature compensation module comprises:
s1: setting an initial temperature point of the incubator, placing the constant current source main circuit into the incubator, changing the internal temperature of the incubator from the initial temperature point, and testing the output current of the constant current source circuit at each temperature point;
s2: testing the output current of the constant current source circuit at each temperature point after being compensated by the first-stage temperature compensation module, and recording and storing the compensation voltage value and the temperature value data of the first-stage temperature compensation module;
s3: the singlechip outputs the voltage converted by the A/D converter as compensation voltage, converts the voltage into compensation current through the series resistor, enables the constant current source to reach a preset target current value, and records and stores data of the compensation voltage value and the temperature value;
s4: and (4) sorting the compensation voltage value and temperature value data recorded and stored in S2 and S3 into a quantitative relation table of the compensation voltage value and the temperature by an interpolation method, and writing the quantitative relation table into a single chip microcomputer program.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112817361A (en) * | 2021-02-15 | 2021-05-18 | 北京瑞尔天天科技有限公司 | High-precision high-stability constant current source circuit |
| CN113867470A (en) * | 2021-10-29 | 2021-12-31 | 西安微电子技术研究所 | Temperature compensation type constant current source unit and current frequency conversion circuit |
| CN115542229A (en) * | 2022-11-25 | 2022-12-30 | 中国兵器装备集团自动化研究所有限公司 | Constant current source calibration system under complex temperature environment |
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| CN113867470A (en) * | 2021-10-29 | 2021-12-31 | 西安微电子技术研究所 | Temperature compensation type constant current source unit and current frequency conversion circuit |
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Application publication date: 20201002 |