CN203535528U - Numerical control DC constant current source circuit - Google Patents
Numerical control DC constant current source circuit Download PDFInfo
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- CN203535528U CN203535528U CN201320467929.6U CN201320467929U CN203535528U CN 203535528 U CN203535528 U CN 203535528U CN 201320467929 U CN201320467929 U CN 201320467929U CN 203535528 U CN203535528 U CN 203535528U
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Abstract
The utility model provides a numerical control DC constant current source circuit. Firstly, a single voltage stabilization chip is adopted for realizing DC voltage stabilization, and then a four-stage operational amplifier is employed for current stabilization to control output current. On one hand, current can be preset through output of a D/A converter, and output current of a transistor is controlled by the operational amplifier; and one the other hand, a single-chip microcomputer system also monitors a constant current source in a real-time manner, self-brought A/D conversion of a single-chip microcomputer dsPIC30F2010 are conducted after the output current is converted by current/voltage, analog quantities are converted into digital quantities in a real-time manner, analysis is carried out by the single-chip microcomputer, and feedback links in the form of data are conducted to make the current more stable. Therefore, a stable voltage controlled current source is formed. The constant current source is high in bearing capacity for changes of impedance of a load, small in circuit scale and high in anti-interference capability. The numerical control DC constant current source circuit is suitable for the field of high-stability and low-power DC constant current sources.
Description
Technical field
The utility model relates to a kind of constant-current source circuit, is a kind of numerical control direct current constant-current source circuit specifically.
Background technology
Traditional constant current source is generally comprised of operational amplifier and triode, but because device is subject to the impact of temperature and the existence of local nonlinearity, such constant current source can not be accomplished real constant current.When external condition changes, we will recompense in time, only in this way just can accomplish real constant current.Therefore, designing a kind of high precision numerical control DC constant current power supply necessitates.
Utility model content
In order to address the above problem, the utility model provides a kind of numerical control direct current constant-current source circuit, first, adopts monolithic voltage stabilizing chip to realize DC voltage-stabilizing, has then adopted level Four operational amplifier to realize current stabilization.For realizing, output current is controlled: on the one hand, by D/A converter, export and realize the preset of electric current, then control transistorized output current through operational amplifier; On the other hand, Single Chip Microcomputer (SCM) system is also taken into account constant current source is monitored in real time, output current is after current/voltage changes, by single-chip microcomputer, carrying A/D conversion carries out, in real time analog quantity is converted into digital quantity, then through single-chip microcomputer analyzing and processing, by the feedback element of data mode, make electric current more stable, form so stable voltage-controlled current source.This voltage controlled current source is strong to the impedance variation holding capacity of load, and circuit scale is little, and antijamming capability is strong, is applicable to need the field of high stability small power DC constant current source.
The utility model solves the technical scheme that its technical matters adopts: this numerical control direct current constant-current source circuit, comprise output regulation circuit, the constant-current source output circuit being formed by Darlington transistor TIP122 and operational amplifier LM248, the voltage conversion circuit being formed by commutation diode IN4001, resistance and electric capacity, keyboard input circuit, Single-chip Controlling unit and the D/A converter being connected with Single-chip Controlling unit; Described keyboard input circuit, Single-chip Controlling unit, D/A converter, output regulation circuit, constant-current source output circuit, voltage conversion circuit and A/D converter are linked in sequence; A/D converter is located in Single-chip Controlling unit.
Constant-current source output circuit, by Darlington transistor TIP122 and operational amplifier LM248, formed, TIP122 base stage is connected with load end, the load other end is connected with+15V power vd D feeder ear, the emitter of TIP122 is as being converted to the input of voltage signal and the negative feedback input end that the LM248 third level is amplified, and the collector of TIP122 is connected with the output that the third level of LM248 is amplified.
The first order of operational amplifier LM248 in constant-current source output circuit is amplified the data input pin of positive input termination potentiometer, and potentiometer two ends respectively meet connect respectively+15V and ground GND after the resistance of 100 ohm, after being connected, the output terminal that the negative input end that the first order is amplified amplifies with the first order connects the positive input terminal that amplify the second level after the resistance of a 10K of series connection, the negative input end two ends that amplify the second level respectively connect 10K resistance, one of the other end of two resistance meets power supply-15V VSS that powers, another connects the output of second level amplification and the positive input terminal that the third level is amplified, the output terminal of the fourth stage is connected with the positive input terminal amplifying with the second level after negative input termination 10K resistance.
Voltage conversion circuit, comprise two commutation diode IN4001, a resistance and an electric capacity form, the current output terminal of constant current source connects the input end of an IN4001, output termination+5V of IN4001, the current output terminal of the output termination constant current source of another IN4001, diode other end ground connection, the current output terminal of constant current source connects a filter capacitor after connecing the resistance of 270 ohm, can complete the task that current conversion is voltage.
Single-chip Controlling unit, comprise single-chip microcomputer dsPIC30F2010, its pin 2 connects the load supplying current feedback terminal that is converted to voltage signal as A/D ALT-CH alternate channel, and the single-chip microcomputer external keyboard input circuit that is used for regulating electric current output also, regulates in real time single-chip microcomputer to regulate parameter; Single-chip Controlling unit is by key entry or have the revised value of feedback current to send into DA change-over circuit.
DA change-over circuit, comprises TLV5618, its pin 1,2,3 are directly connected with the pin 26,25,24 of single-chip microcomputer respectively, pin 4 is connected with the positive input terminal that the fourth stage of operational amplifier LM248 amplifies, pin 5 ground connection of TLV5618, the data input pin of pin 6 reference voltage termination potentiometers meets power supply+5V after connecting with 1k resistance, and pin 7 is unsettled, connect+5V of pin 8, ground connection after being then connected with 470uF electrochemical capacitor with 0.1uF.
Rectifying and wave-filtering power supply unit comprises outside input+15V ,-15V, and+5V voltage, adds respectively electric capacity to it and carry out filtering, to each circuit module power supply.
The beneficial effects of the utility model are: this numerical control direct current constant-current source circuit, and strong to the impedance variation holding capacity of load, circuit scale is little, and antijamming capability is strong, is suitable for the occasion higher to current requirements.
Accompanying drawing explanation
The structural representation of the operational amplifier LM248 that accompanying drawing 2 is constant-current source output circuit.
The structural representation of the Darlington transistor TIP122 that accompanying drawing 3 is constant-current source output circuit.
The structural representation that accompanying drawing 4 is voltage conversion circuit.
Accompanying drawing 5 is the structural representation of Single-chip Controlling unit.
The structural representation that accompanying drawing 6 is D/A converter.
In figure, 1. rectifying and wave-filtering power supply unit, 2. output regulation circuit, 3. constant-current source output circuit, 4. voltage conversion circuit, 5.A/D converter, 6. keyboard input circuit, 7. Single-chip Controlling unit, 8.D/A converter.
Embodiment
In the accompanying drawings, this numerical control direct current constant-current source circuit, comprise output regulation circuit 2, the constant-current source output circuit 3 being formed by Darlington transistor TIP122 and operational amplifier LM248, the voltage conversion circuit 4 being formed by commutation diode IN4001, resistance and electric capacity, keyboard input circuit 6, Single-chip Controlling unit 7 and the D/A converter 8 being connected with Single-chip Controlling unit 7; Described keyboard input circuit 6, Single-chip Controlling unit 7, D/A converter 8, output regulation circuit 2, constant-current source output circuit 3, voltage conversion circuit 4 and A/D converter 5 are linked in sequence; A/D converter 5 is located in Single-chip Controlling unit 7.
By accompanying drawing 2 and accompanying drawing 3, can be found out, constant-current source output circuit 3, by Darlington transistor TIP122 and operational amplifier LM248, formed, TIP122 base stage is connected with load end, the load other end is connected with+15V power vd D feeder ear, the emitter of TIP122 is as being converted to the input of voltage signal and the negative feedback input end that the LM248 third level is amplified, and the collector of TIP122 is connected with the output that the third level of LM248 is amplified.
The first order of operational amplifier LM248 in constant-current source output circuit 3 is amplified the data input pin of positive input termination potentiometer, and potentiometer two ends respectively meet connect respectively+15V and ground GND after the resistance of 100 ohm, after being connected, the output terminal that the negative input end that the first order is amplified amplifies with the first order connects the positive input terminal that amplify the second level after the resistance of a 10K of series connection, the negative input end two ends that amplify the second level respectively connect 10K resistance, one of the other end of two resistance meets power supply-15V VSS that powers, another connects the output of second level amplification and the positive input terminal that the third level is amplified, the output terminal of the fourth stage is connected with the positive input terminal amplifying with the second level after negative input termination 10K resistance.
4 can find out by reference to the accompanying drawings, voltage conversion circuit 4, comprise two commutation diode IN4001, a resistance and an electric capacity form, and the current output terminal of constant current source connects the input end of an IN4001, output termination+5V of IN4001, the current output terminal of the output termination constant current source of another IN4001, diode other end ground connection, the current output terminal of constant current source connects a filter capacitor after connecing the resistance of 270 ohm, can complete the task that current conversion is voltage.
5 can find out by reference to the accompanying drawings, Single-chip Controlling unit 7, comprise single-chip microcomputer dsPIC30F2010, its pin 2 connects the load supplying current feedback terminal that is converted to voltage signal as A/D ALT-CH alternate channel, and single-chip microcomputer is the external keyboard input circuit 6 that is used for regulating electric current output also, regulate in real time single-chip microcomputer to regulate parameter; Single-chip Controlling unit 7 is by key entry or have the revised value of feedback current to send into DA change-over circuit 8.
6 can find out by reference to the accompanying drawings, and DA change-over circuit 8, comprises TLV5618, its pin 1,2,3 respectively with the pin 26 of single-chip microcomputer, 25,24 are directly connected, and pin 4 is connected with the positive input terminal that the fourth stage of operational amplifier LM248 amplifies, pin 5 ground connection of TLV5618, the data input pin of pin 6 reference voltage termination potentiometers meets power supply+5V after connecting with 1k resistance, pin 7 is unsettled, connect+5V of pin 8, ground connection after being then connected with 470uF electrochemical capacitor with 0.1uF.
Rectifying and wave-filtering power supply unit 1 comprises outside input+15V ,-15V, and+5V voltage, adds respectively electric capacity to it and carry out filtering, to each circuit module power supply.
The course of work of the present utility model is as described below: rectifying and wave-filtering power supply unit 1 is by the AC rectification filtering of input, the current signal obtaining is exported after constant-current source output circuit 3 amplifies rectification continuously, voltage conversion circuit 4 reflects curent change in time according to load variations, and transfer to the 7 pairs of electric current real-time samplings analysis of Single-chip Controlling unit and each several part feedback element is carried out to integral body adjustment after A/D converter 5 conversions, the digital signal of Single-chip Controlling unit 7 outputs feeds back to output adjustment unit 2 to stablize constant current source output after D/A converter 8 conversions.
Claims (6)
1. a numerical control direct current constant-current source circuit, it is characterized in that: comprise output regulation circuit (2), the constant-current source output circuit (3) being formed by Darlington transistor TIP122 and operational amplifier LM248, the voltage conversion circuit being formed by commutation diode IN4001, resistance and electric capacity (4), keyboard input circuit (6), Single-chip Controlling unit (7) and the D/A converter (8) being connected with Single-chip Controlling unit (7); Described keyboard input circuit (6), Single-chip Controlling unit (7), D/A converter (8), output regulation circuit (2), constant-current source output circuit (3), voltage conversion circuit (4) and A/D converter (5) are linked in sequence; A/D converter (5) is located in Single-chip Controlling unit (7).
2. a kind of numerical control direct current constant-current source circuit according to claim 1, it is characterized in that: constant-current source output circuit (3), by Darlington transistor TIP122 and operational amplifier LM248, formed, TIP122 base stage is connected with load end, the load other end is connected with+15V power vd D feeder ear, the emitter of TIP122 is as being converted to the input of voltage signal and the negative feedback input end that the LM248 third level is amplified, and the collector of TIP122 is connected with the output that the third level of LM248 is amplified.
3. a kind of numerical control direct current constant-current source circuit according to claim 2, it is characterized in that: the first order of the operational amplifier LM248 in constant-current source output circuit (3) is amplified the data input pin of positive input termination potentiometer, and potentiometer two ends respectively meet connect respectively+15V and ground GND after the resistance of 100 ohm, after being connected, the output terminal that the negative input end that the first order is amplified amplifies with the first order connects the positive input terminal that amplify the second level after the resistance of a 10K of series connection, the negative input end two ends that amplify the second level respectively connect 10K resistance, one of the other end of two resistance meets power supply-15V VSS that powers, another connects the output of second level amplification and the positive input terminal that the third level is amplified, the output terminal of the fourth stage is connected with the positive input terminal amplifying with the second level after negative input termination 10K resistance.
4. a kind of numerical control direct current constant-current source circuit according to claim 1, it is characterized in that: voltage conversion circuit (4), comprise two commutation diode IN4001, a resistance and an electric capacity form, the current output terminal of constant current source connects the input end of an IN4001, output termination+5V of IN4001, the current output terminal of the output termination constant current source of another IN4001, diode other end ground connection, the current output terminal of constant current source connects a filter capacitor after connecing the resistance of 270 ohm, can complete the task that current conversion is voltage.
5. a kind of numerical control direct current constant-current source circuit according to claim 1, it is characterized in that: Single-chip Controlling unit (7), comprise single-chip microcomputer dsPIC30F2010, its pin 2 connects the load supplying current feedback terminal that is converted to voltage signal as A/D ALT-CH alternate channel, and single-chip microcomputer is the external keyboard input circuit (6) that is used for regulating electric current output also, regulate in real time single-chip microcomputer to regulate parameter; Single-chip Controlling unit (7) is by key entry or have the revised value of feedback current to send into DA change-over circuit (8).
6. a kind of numerical control direct current constant-current source circuit according to claim 1, it is characterized in that: DA change-over circuit (8), comprise TLV5618, its pin 1,2,3 respectively with the pin 26 of single-chip microcomputer, 25,24 are directly connected, and pin 4 is connected with the positive input terminal that the fourth stage of operational amplifier LM248 amplifies, pin 5 ground connection of TLV5618, the data input pin of pin 6 reference voltage termination potentiometers meets power supply+5V after connecting with 1k resistance, pin 7 is unsettled, connect+5V of pin 8, ground connection after being then connected with 470uF electrochemical capacitor with 0.1uF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320467929.6U CN203535528U (en) | 2013-08-02 | 2013-08-02 | Numerical control DC constant current source circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320467929.6U CN203535528U (en) | 2013-08-02 | 2013-08-02 | Numerical control DC constant current source circuit |
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| CN203535528U true CN203535528U (en) | 2014-04-09 |
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| CN201320467929.6U Expired - Fee Related CN203535528U (en) | 2013-08-02 | 2013-08-02 | Numerical control DC constant current source circuit |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106169912A (en) * | 2016-06-28 | 2016-11-30 | 浙江中医药大学 | Pulse wave generation circuit |
| CN107229302A (en) * | 2017-06-30 | 2017-10-03 | 西安理工大学 | The on-chip system of voltage controlled current source drive circuit and put forward high-precision method using it |
| CN109634340A (en) * | 2018-12-19 | 2019-04-16 | 卡斯柯信号有限公司 | A kind of voltage controlled current source output circuit |
| CN110488901A (en) * | 2019-09-18 | 2019-11-22 | 深圳市友华通信技术有限公司 | The output voltage adjusting method and device of power module |
| CN113359920A (en) * | 2021-06-16 | 2021-09-07 | 广东电网有限责任公司 | High-stability direct current source and control system |
| CN114325008A (en) * | 2020-10-12 | 2022-04-12 | 福州市瓦涵新能源科技有限公司 | Passive adjustable constant current electronic load |
-
2013
- 2013-08-02 CN CN201320467929.6U patent/CN203535528U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106169912A (en) * | 2016-06-28 | 2016-11-30 | 浙江中医药大学 | Pulse wave generation circuit |
| CN106169912B (en) * | 2016-06-28 | 2018-03-16 | 浙江中医药大学 | Pulse wave generation circuit |
| CN107229302A (en) * | 2017-06-30 | 2017-10-03 | 西安理工大学 | The on-chip system of voltage controlled current source drive circuit and put forward high-precision method using it |
| CN109634340A (en) * | 2018-12-19 | 2019-04-16 | 卡斯柯信号有限公司 | A kind of voltage controlled current source output circuit |
| CN109634340B (en) * | 2018-12-19 | 2023-10-13 | 卡斯柯信号有限公司 | Voltage-controlled constant-current source output circuit |
| CN110488901A (en) * | 2019-09-18 | 2019-11-22 | 深圳市友华通信技术有限公司 | The output voltage adjusting method and device of power module |
| CN114325008A (en) * | 2020-10-12 | 2022-04-12 | 福州市瓦涵新能源科技有限公司 | Passive adjustable constant current electronic load |
| CN113359920A (en) * | 2021-06-16 | 2021-09-07 | 广东电网有限责任公司 | High-stability direct current source and control system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140409 Termination date: 20140802 |
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| EXPY | Termination of patent right or utility model |