CN213122740U - High-precision constant current source circuit - Google Patents
High-precision constant current source circuit Download PDFInfo
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- CN213122740U CN213122740U CN202021562915.9U CN202021562915U CN213122740U CN 213122740 U CN213122740 U CN 213122740U CN 202021562915 U CN202021562915 U CN 202021562915U CN 213122740 U CN213122740 U CN 213122740U
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Abstract
The utility model discloses a high accuracy constant current source circuit belongs to analog circuit design technical field, and it includes singlechip, the reference voltage who is connected with the monolithic electricity produces circuit and drive circuit, the electric current production circuit of being connected with the drive circuit electricity each other. The reference positive terminal Vref + pin and the reference negative terminal Vref-pin of the reference voltage driving circuit are respectively and independently connected with the positive end and the negative end of the reference voltage of the current generating circuit, the reference voltage generating circuit provides the reference voltage with adjustable voltage for the driving circuit, and the output voltage of the driving circuit is adjusted by adjusting the value of the reference voltage, so that the output current of the current generating circuit is adjusted. The circuit has the advantages of simple external circuit, reliable performance, high current switching speed and the like, and has wide application prospects in the aspects of quick adjustment, high-precision measurement and the like.
Description
Technical Field
The utility model relates to an analog circuit designs technical field, especially relates to a high accuracy constant current source circuit.
Background
The constant current source is an important component of analog circuit design and can be used for driving, controlling and biasing circuits. The traditional constant current source is designed to change the characteristics of the constant current source by adjusting the size of a bias resistor, and although the size of the bias resistor can be changed manually, the mode is difficult to realize accurate control in some occasions requiring nonlinearity, high precision and quick response. In addition, the traditional constant current source is influenced by factors such as temperature, power supply voltage and the like, so that the precision is not high and the linearity is not good.
SUMMERY OF THE UTILITY MODEL
The utility model provides a high accuracy constant current source circuit has advantages such as external circuit is simple, dependable performance, current switching speed are fast, has wide application prospect in aspects such as quick adjustment, high accuracy measurement.
The utility model provides a specific technical scheme as follows:
a high-precision constant current source circuit comprises a single chip microcomputer, a reference voltage generating circuit, a driving circuit and a current generating circuit, wherein the reference voltage generating circuit and the driving circuit are electrically connected with the single chip microcomputer, the current generating circuit is electrically connected with the reference voltage generating circuit and the driving circuit, a reference positive end Vref + pin and a reference negative end Vref-pin of the reference voltage driving circuit are respectively and independently connected with a reference voltage positive end and a reference voltage negative end of the current generating circuit, and the positive pin and the negative pin of the reference voltage of the driving circuit are independently wired with the positive pin and the negative pin of the.
Optionally, the single chip microcomputer is an MSP430F2619TPN single chip microcomputer, the single chip microcomputer is provided with two 12-bit ADCs and two 12-bit DACs, and the single chip microcomputer is internally configured to generate a reference voltage of 2.5V.
The utility model has the advantages as follows:
the embodiment of the utility model provides a high accuracy constant current source circuit includes the singlechip, reference voltage generation circuit and drive circuit with the singlechip electricity is connected, the electric current production circuit with reference voltage generation circuit and drive circuit electricity each other, wherein, reference VCC pin and the reference GND pin of reference voltage generation circuit are connected with the electric current production circuit between electricity respectively, the positive pole pin, positive ground pin, negative pole pin and the negative pole ground pin of drive circuit all are connected with the electric current production circuit between electricity, adopt reference voltage generation circuit to provide the reference voltage of adjustable voltage size for the electric current production circuit, through adjusting this reference voltage value's size, thereby realize the regulation to electric current production circuit output current size, reference voltage that reference voltage generation circuit provided drives MOS pipe after operational amplifier amplifies or attenuates and realizes the output of stabilization current, the method has the advantages of simple external circuit, reliable performance and the like, can realize automatic adjustment, and has wide application prospect in the aspect of high precision.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a high-precision constant current source circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a current generation circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
A high-precision constant current source circuit according to an embodiment of the present invention will be described in detail with reference to fig. 1 to 2.
Refer to fig. 1, fig. 2 shows, the embodiment of the utility model provides a high accuracy constant current source circuit includes singlechip 1, reference voltage who is connected with singlechip 1 electricity produces circuit 2 and drive circuit 3, produce circuit 4 with reference voltage and the electric current of drive circuit 3 interconnect electricity, wherein, reference voltage produces circuit 2's benchmark VCC pin and benchmark GND pin respectively with the electric current produce circuit between 4 electricity be connected, drive circuit 3's anodal pin V +, anodal ground connection pin V + _ GND, negative pole pin V-and negative pole ground connection pin V _GNDall with the electric current produce circuit between 4 electricity be connected. The positive reference terminal Vref + pin and the negative reference terminal Vref-pin of the reference voltage driving circuit are respectively and independently connected with the positive and negative reference voltage terminals of the current generating circuit, and the positive and negative reference voltage pins of the driving circuit are independently wired with the positive and negative reference voltage pins of the current generating circuit.
The utility model discloses the singlechip is MSP430F2619TPN singlechip, and this singlechip has two 12 ADC and two 12 DAC, and this singlechip internal configuration is for producing 2.5V's reference voltage. The reference voltage generating circuit is configured to provide a reference voltage for the current generating circuit, and as shown in fig. 2, the reference voltage provided by the reference voltage generating circuit is amplified or attenuated by the operational amplifier and then drives the MOS transistor to output a stable current.
The embodiment of the utility model provides an adopt silicon's MSP430F2619TPN singlechip, this chip has two 12 ADC, two 12 DAC, and inside can oneself produce 2.5V's reference voltage. In order to improve the current output precision, the reference voltage of the single chip microcomputer adopts an external high-precision REF6225IDGKT chip, the chip can generate 2.5V voltage output, the tolerance is controlled to be 4 ten-thousandth, and the stability is superior to 3ppm, so that the ADC and DAC conversion of the chip can reach high precision.
The reference voltage generating circuit generates high-precision reference voltage which is adjustable voltage, and the subsequent current is adjusted by adjusting the voltage value. The reference voltage generated by the reference voltage generating circuit is sent to an operational amplifier, the operational amplifier amplifies/attenuates the reference voltage, and then the MOS tube at the rear end is driven, so that current output is realized.
The embodiment of the utility model provides a high accuracy constant current source circuit includes the singlechip, reference voltage generation circuit and drive circuit with the singlechip electricity is connected, the electric current production circuit with reference voltage generation circuit and drive circuit electricity each other, wherein, reference VCC pin and the reference GND pin of reference voltage generation circuit are connected with the electric current production circuit between electricity respectively, the positive pole pin, positive ground pin, negative pole pin and the negative pole ground pin of drive circuit all are connected with the electric current production circuit between electricity, adopt reference voltage generation circuit to provide the reference voltage of adjustable voltage size for the electric current production circuit, through adjusting this reference voltage value's size, thereby realize the regulation to electric current production circuit output current size, reference voltage that reference voltage generation circuit provided drives MOS pipe after operational amplifier amplifies or attenuates and realizes the output of stabilization current, the method has the advantages of simple external circuit, reliable performance and the like, can realize automatic adjustment, and has wide application prospect in the aspect of high precision.
The embodiment of the utility model provides a current that high accuracy constant current source circuit produced is adjustable in succession and system response speed is fast, and moreover, the linearity and the reliability of this circuit are high, have stronger practicality.
It is apparent that those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (2)
1. The high-precision constant current source circuit is characterized by comprising a single chip microcomputer, a reference voltage generating circuit and a driving circuit which are electrically connected with the single chip microcomputer, and a current generating circuit which is electrically connected with the reference voltage generating circuit and the driving circuit, wherein a reference positive terminal Vref + pin and a reference negative terminal Vref-pin of the reference voltage driving circuit are respectively and independently connected with a positive terminal and a negative terminal of a reference voltage of the current generating circuit, and the positive pin and the negative pin of the reference voltage of the driving circuit are independently wired with the positive pin and the negative pin of the current generating circuit.
2. The high-precision constant current source circuit according to claim 1, wherein the single chip microcomputer is an MSP430F2619TPN single chip microcomputer, the single chip microcomputer has two 12-bit ADCs and two 12-bit DACs, and the single chip microcomputer is internally configured to generate a reference voltage of 2.5V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021562915.9U CN213122740U (en) | 2020-07-31 | 2020-07-31 | High-precision constant current source circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021562915.9U CN213122740U (en) | 2020-07-31 | 2020-07-31 | High-precision constant current source circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213122740U true CN213122740U (en) | 2021-05-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021562915.9U Active CN213122740U (en) | 2020-07-31 | 2020-07-31 | High-precision constant current source circuit |
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| CN (1) | CN213122740U (en) |
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2020
- 2020-07-31 CN CN202021562915.9U patent/CN213122740U/en active Active
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