CN214067683U - Simple digital control precision constant current source device - Google Patents
Simple digital control precision constant current source device Download PDFInfo
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- CN214067683U CN214067683U CN202021509319.4U CN202021509319U CN214067683U CN 214067683 U CN214067683 U CN 214067683U CN 202021509319 U CN202021509319 U CN 202021509319U CN 214067683 U CN214067683 U CN 214067683U
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- current source
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- 238000005070 sampling Methods 0.000 claims abstract description 34
- 238000006243 chemical reaction Methods 0.000 claims abstract description 9
- 230000003993 interaction Effects 0.000 claims abstract description 5
- 238000001514 detection method Methods 0.000 claims description 7
- 239000003990 capacitor Substances 0.000 claims description 4
- 239000004973 liquid crystal related substance Substances 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 3
- 239000011159 matrix material Substances 0.000 claims description 3
- 230000006641 stabilisation Effects 0.000 claims description 3
- 238000011105 stabilization Methods 0.000 claims description 3
- 230000003321 amplification Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000003199 nucleic acid amplification method Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- 230000017525 heat dissipation Effects 0.000 description 2
- 229910001006 Constantan Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Abstract
The utility model relates to the technical field of electronic measuring equipment, in particular to a simple digital control precise constant current source device, which comprises a power supply circuit device, a constant current source device, a control circuit device, a current sampling circuit device, a display circuit device and an output device, wherein the power supply circuit device is electrically connected with the control circuit device, and the control circuit device is electrically connected with the constant current source device, the current sampling circuit device, the display circuit device and the output device respectively; the control circuit equipment comprises a human-computer interaction interface control module and a constant current part current control module; the constant current source equipment comprises a closed loop feedback control module formed by adopting a multistage precision operational amplifier OP 07; the current sampling circuit equipment comprises a current sampling circuit and a current sampling conversion circuit; the utility model can provide the load with accurate 0 to 2000mA output constant current and can display the output current value in real time; the whole numerical control constant current source has the characteristics of high and stable output current precision, convenience in use and the like.
Description
Technical Field
The utility model relates to an electronic measurement equipment technical field specifically is a simple and easy accurate constant current source device of digital control.
Background
The constant current source is a power source capable of supplying a constant current to a load, and has a wide application range, such as measurement and classification of resistance values of resistors, measurement of cable resistance, and the like, and the more stable the current is, the more accurate the measurement is. It can not only provide bias current for various amplifying circuits to stabilize their static working points, but also can be used as their active load to raise amplification factor, and can be extensively used in differential amplifying circuit and pulse generating circuit.
At present, the output current of the constant current source appearing on the market is not accurate and stable enough, and the reasons are as follows: (1) and the input voltage of the power grid is unstable. The power supply of the power grid has a peak period and a valley period, and cannot be stable all the time; (2) formed by load variations. For example, when the load is short-circuited, the load current is large, the output voltage of the power supply tends to be close to zero, and the power supply is burnt out after a long time; (3) facilitated by the conditions of the regulated power supply itself. The quality of components forming the stable power supply is poor, and when parameters are changed or completely fail, fluctuation caused by the former two reasons cannot be effectively adjusted; (4) the output instability of the stabilized power supply can be influenced by the performance change of the components due to the influence of the environment such as temperature, humidity and the like. Therefore, it is imperative to design a constant current source system that is stable and can accurately output.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a can provide the accurate constant current source device of simple and easy digital control of 0 to 2000mA digital control adjustable of stable and accurate output to the not enough of prior art existence.
In order to achieve the above object, the present invention provides a simple digital control precise constant current source device, which comprises a power supply circuit device, a constant current source device, a control circuit device, a current sampling circuit device, a display circuit device and an output device, wherein the power supply circuit device is electrically connected to the control circuit device, and the control circuit device is electrically connected to the constant current source device, the current sampling circuit device, the display circuit device and the output device respectively; the control circuit equipment comprises a human-computer interaction interface control module and a constant current part current control module; the constant current source equipment comprises a closed loop feedback control module formed by adopting a multistage precision operational amplifier OP 07; the current sampling circuit device comprises a current sampling circuit and a current sampling conversion circuit.
Furthermore, the constant current source device further comprises a detection device electrically connected with the control circuit device, and the detection device is externally connected with the detected electronic component.
Furthermore, the power supply circuit equipment comprises a high-power transformer power supply module, a multi-stage capacitor and network filtering ripple interference module, a three-terminal voltage stabilization output module and a high-power Darlington tube current expansion module.
Further, the power supply circuit equipment is externally connected with 220V alternating current.
Furthermore, the display circuit equipment adopts a dot matrix type liquid crystal display screen module.
Further, the constant current source device outputs a constant current of 0-2000 mA.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses a simple and easy accurate constant current source device of digital control, including supply circuit equipment, constant current source equipment, control circuit equipment, current sampling circuit equipment, display circuit equipment and output device, supply circuit equipment and control circuit equipment electric connection, control circuit equipment respectively with constant current source equipment, current sampling circuit equipment, display circuit equipment and output device electric connection; the control circuit equipment comprises a human-computer interaction interface control module and a constant current part current control module; the constant current source equipment comprises a closed loop feedback control module formed by adopting a multistage precision operational amplifier OP 07; the current sampling circuit device comprises a current sampling circuit and a current sampling conversion circuit; the utility model can provide the load with accurate 0 to 2000mA output constant current and can display the output current value in real time; and the whole numerical control constant current source has the characteristics of high and stable output current precision, convenient use and the like.
Drawings
Fig. 1 is a block diagram of the present invention;
fig. 2 is a schematic diagram of a constant current source device according to the present invention;
fig. 3 is a schematic diagram of a control circuit apparatus according to the present invention;
fig. 4 is a schematic diagram of a current sampling circuit according to the present invention;
fig. 5 is a schematic diagram of the medium current sampling conversion circuit of the present invention.
In the figure: the device comprises a power supply circuit device 1, a constant current source device 2, a control circuit device 3, a current sampling circuit device 4, a display circuit device 5, an output device 6 and a detection device 7.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, 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 work belong to the protection scope of the present invention.
Referring to fig. 1-5, the present invention provides a technical solution: a simple digital control precise constant current source device comprises a power supply circuit device 1, a constant current source device 2, a control circuit device 3, a current sampling circuit device 4, a display circuit device 5 and an output device 6, wherein the power supply circuit device 1 is electrically connected with the control circuit device 3, and the control circuit device 3 is respectively electrically connected with the constant current source device 2, the current sampling circuit device 4, the display circuit device 5 and the output device 6; the control circuit device 3 comprises a human-computer interaction interface control module and a constant current part current control module; the constant current source device 2 comprises a closed loop feedback control module formed by a multi-stage precise operational amplifier OP07, and the control precision can be effectively improved; the current sampling circuit device 4 includes a current sampling circuit and a current sampling conversion circuit. In the embodiment, the constant current source device can output a constant current of 0-2000mA, and the whole numerical control constant current source has the characteristics of high precision and stability of output current, convenience in use and the like.
Specifically, the constant current source device further comprises a detection device 7 electrically connected with the control circuit device 3, and the detection device 7 is externally connected with a detected electronic component.
Specifically, the power supply circuit device 1 comprises a high-power transformer power supply module, a multi-stage capacitor and network filtering ripple interference module, a three-terminal voltage stabilization output module and a high-power darlington tube current expansion module; wherein, the power supply circuit equipment 1 is externally connected with 220V alternating current.
Specifically, the display circuit device 5 adopts a 128 × 64 dot-matrix liquid crystal display module, and can display the set current value and the actually measured current value in real time.
Referring to fig. 2, the operational amplifier U3 is an inverting adder, the input signal at the inverting terminal has two paths, one path of the input signal is Vin, the other path of the input signal is the output feedback of the operational amplifier U5, and R107 is the feedback resistor of U3. The current-expanding part is added to the circuit because the output current of the operational amplifier is small. A class AB push-pull type power amplifying circuit is formed by adopting triodes Q1 and Q2, Darlington tubes TIP142 and TIP 147. The Darlington tubes TIP142 and TIP147 are complementary pair tubes which are conducted in turn, and cross-over distortion phenomenon can not occur. The dead zone of the constant current source output is avoided in a hardware mode. U4 is a voltage follower, and because of its high input impedance, there is substantially no current flowing into the positive input of U4, so the current flowing through Rf can be considered to be flowing entirely into load RL. U5 is an inverting amplifier, and since R108 ═ R109 ═ 10K, the inverse amplification factor of U5 is 1, i.e., U5 is an inverter with an amplification factor of-1.
Referring to fig. 3, the control circuit device is mainly implemented by using a 12-bit DAC of a C8051F020 single chip microcomputer. U1 is a voltage follower and U2 is an inverter. And the DAC of the C8051F020 singlechip microcomputer is used for outputting 0-2V voltage. When the relay control port CON1 is low, the relay 2, 3 pins are connected. The output voltage of the constant current mode port is the reverse voltage output by the DAC, and the constant current source is an inflow constant current source; when the relay control port CON1 is high, the relay 3, 4 pins are connected. The output voltage of the constant current mode port is the DAC output voltage, and the constant current source is an outflow constant current source. The constant current source is set in an inflow/outflow manner by controlling the relay.
Referring to fig. 4, the current sampling circuit has a function of extracting and converting voltages at two ends of the high-power heat dissipation resistor, and Rf in the drawing is the high-power heat dissipation resistor. V1 is the positive current in point and V2 is the positive current out point. The operational amplifiers U6 and U7 are voltage followers, the voltage values of the two points V1 and V2 are respectively extracted, and the output value of the constant current source is not influenced because the input impedance of the voltage followers is very high and the current is basically not taken. U8 is an inverting amplifier, R116 is R117, and the amplification factor is-1, that is, an inverter is configured. The U8 output is-V2. U9 is an inverse adder, and V1 and-V2 are connected to the inverse adder U9.
Referring to fig. 5, the operational amplifier U10 and the relay constitute a constant current source mode selection circuit. The operational amplifier U10 is a directional amplifier, and since R122 ═ R140 ═ 10K, the amplification factor is-1. Therefore, the function of U10 is to convert an input negative voltage into a positive voltage. Because the C8051F020 single chip microcomputer AD can only collect positive voltage, when the constant current source is in the inflow mode, the voltage input to the sampling conversion circuit is negative voltage, the relay control port CON2 is low level, and the pins 2 and 3 of the relay are turned on. The negative voltage is converted into a positive voltage by the sampling conversion circuit. When the constant current source is in the outflow mode, the input voltage is a positive voltage. The relay control port CON2 is high level, and relay pin 3, 4 switch on, and input voltage direct input C8051F020 singlechip AD gathers and does not pass through sampling conversion circuit. The DA1 is a 3.3V voltage regulator tube and protects the AD sampling port of the C8051F020 singlechip.
The utility model discloses during the use, can realize that the electric current is from 0 to 2000mA digital control adjustable direct current constant current source system. The system power supply part adopts a self-made power supply circuit and adopts a multi-stage capacitor and a pi network to filter ripple interference. The power output part adopts a three-end voltage stabilizing chip to stabilize voltage, and utilizes a high-power Darlington tube to expand current so as to meet the requirement of the later-stage power. The constant current source part adopts a plurality of precise operational amplifiers OP07 to form a closed loop feedback control mode, thereby improving the control precision. The controlled part adopts a Darlington tube to carry out current expansion and accurately set output current. The current measuring part adopts a constantan resistance wire as a precise sampling resistor, and is not influenced by the change of external temperature; the display part of the system adopts a 128 multiplied by 64 lattice type liquid crystal display screen to display the set current value and the measured current value in real time. The whole numerical control constant current source has the characteristics of high output current precision, stability and convenience in use.
While the embodiments of the invention have been described above, it is not intended to be limited to the details shown, or described, but rather to cover all modifications, which would come within the scope of the invention, as defined by the claims and the equivalents thereof, and which fall within the limits of the claims and the equivalents thereof.
Claims (6)
1. The utility model provides a simple and easy accurate constant current source device of digital control which characterized in that: the power supply circuit device comprises a power supply circuit device (1), a constant current source device (2), a control circuit device (3), a current sampling circuit device (4), a display circuit device (5) and an output device (6), wherein the power supply circuit device (1) is electrically connected with the control circuit device (3), and the control circuit device (3) is electrically connected with the constant current source device (2), the current sampling circuit device (4), the display circuit device (5) and the output device (6) respectively; the control circuit device (3) comprises a human-computer interaction interface control module and a constant current part current control module; the constant current source device (2) comprises a closed loop feedback control module formed by a multistage precision operational amplifier OP 07; the current sampling circuit device (4) comprises a current sampling circuit and a current sampling conversion circuit.
2. The simple digital control precise constant current source device according to claim 1, wherein: the constant current source device further comprises a detection device (7) electrically connected with the control circuit device (3), and the detection device (7) is externally connected with a detected electronic component.
3. The simple digital control precise constant current source device according to claim 2, wherein: the power supply circuit equipment (1) comprises a high-power transformer power supply module, a multi-stage capacitor and network filtering ripple interference module, a three-terminal voltage stabilization output module and a high-power Darlington tube current expansion module.
4. The simple digital control precise constant current source device according to claim 3, wherein: the power supply circuit equipment (1) is externally connected with 220V alternating current.
5. The simple digital control precise constant current source device according to claim 4, wherein: the display circuit equipment (5) adopts a dot matrix type liquid crystal display screen module.
6. The simple digital control precise constant current source device according to claim 5, wherein: the constant current source device outputs a constant current of 0-2000 mA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021509319.4U CN214067683U (en) | 2020-07-27 | 2020-07-27 | Simple digital control precision constant current source device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021509319.4U CN214067683U (en) | 2020-07-27 | 2020-07-27 | Simple digital control precision constant current source device |
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| Publication Number | Publication Date |
|---|---|
| CN214067683U true CN214067683U (en) | 2021-08-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021509319.4U Expired - Fee Related CN214067683U (en) | 2020-07-27 | 2020-07-27 | Simple digital control precision constant current source device |
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| Country | Link |
|---|---|
| CN (1) | CN214067683U (en) |
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2020
- 2020-07-27 CN CN202021509319.4U patent/CN214067683U/en not_active Expired - Fee Related
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Granted publication date: 20210827 |