CN201600610U - Numerical control direct current source - Google Patents
Numerical control direct current source Download PDFInfo
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- CN201600610U CN201600610U CN2010200625289U CN201020062528U CN201600610U CN 201600610 U CN201600610 U CN 201600610U CN 2010200625289 U CN2010200625289 U CN 2010200625289U CN 201020062528 U CN201020062528 U CN 201020062528U CN 201600610 U CN201600610 U CN 201600610U
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- current source
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- power supply
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Abstract
The utility model discloses a numerical control direct current source, which is characterized in that the current source is supplied with power by a numerical control circuit and a current source main circuit, the current source main circuit is connected to the numerical control circuit and a load respectively, and the numerical control circuit is connected with a keyboard/display circuit. With the structure, the numerical control direct current source has the advantages of 1, increasing power supply precision of the direct current source and expanding adjusting range thereof, 2, realizing functions of real-time monitoring of the supply current and adjusting the same in time, and 3, being capable of fine adjusting direct current provided by the direct current source and increasing universality of the direct current source.
Description
Relate to the field
The utility model relates to the direct supply field, particularly a kind of Digital Control Direct Current Source.
Background technology
In real life, a lot of electronic systems have all required the power supply of galvanic current stream source.Particularly in industrial enterprise and laboratory, the DC voltage-stabilizing current source has obtained using widely as a kind of electronic equipment of indispensability.
Present existing DC current source is divided into two kinds, a kind of is to adopt three terminal regulator 317 to form, rely on the binary-coded digit-control resistance network of Single-chip Controlling to realize changing resistance parameter, reach the adjustable purpose of electric current numerical control, but the problem of the resistance precision during owing to stepping between adjacent per two grades is so the precision of output current is difficult to reach actual needs.Also have a kind of DC current source to adopt current regulator diode or constant current triode, though can reach than high control precision, the reference constant current that sort circuit can be realized is very little, can only reach tens milliamperes, and practical value is also little.And general DC current source is often fixing to be exported a kind of current value or several grades of current values is only arranged, and is not easy to general.Though and some current source can realize numerical control but whether the output current value that sets accurately can not observe very intuitively.
Improve DC current source power supply precision and enlarge its adjustable extent, and to realize supply current is monitored in real time and adjusted be the problem that prior art need solve.
The utility model content
Technical problem to be solved in the utility model is, a kind of Digital Control Direct Current Source is provided, and improves DC current source power supply precision and enlarges its adjustable extent to reach, and realize purpose that supply current is monitored in real time and in time adjusted.
For solving the problems of the technologies described above, the technical solution of the utility model is, a kind of Digital Control Direct Current Source, it is characterized in that: described current source supply power supply is digital-control circuit and the power supply of current source main circuit, the current source main circuit is connected respectively to digital-control circuit and load, digital-control circuit is connected with keyboard/display circuit, is other power electronic equipment thereby constitute Digital Control Direct Current Source.
Described current source main circuit be civil power through after the transformation through single-phase fully controlled bridge rectification and capacitor C 13, C14 filtering, insert load by 7815 voltage stabilizings of three-phase voltage stabilizer, provide direct supply thereby be embodied as electronic product.
Described digital-control circuit inserts single-chip microcomputer after being connected to the A/D conversion with sampling resistor RS for load RL insert to adjust respectively behind pipe and the comparison amplifier again, thereby realization is monitored in real time and in time adjusted supply current.
Be provided with photoelectrical coupler in the described current source supply power supply, thereby the phase mutual interference is avoided in the ground connection isolation of mimic channel in the realization current source supply power supply and digital circuit.
The model of described single-chip microcomputer is AT89C52, thereby realizes the comparison of sample rate current and the adjustment function of electric current.
The model of described three-phase voltage stabilizer is LM7851CT.
A kind of Digital Control Direct Current Source, owing to adopt said structure, this equipment has the following advantages: 1, improve DC current source power supply precision and enlarge its adjustable extent; 2, realized function that supply current is monitored in real time and in time adjusted; 3, can realize fine adjustment function for the DC current that provides, guarantee its accuracy.
Description of drawings
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail;
Fig. 1 is the system block diagram of a kind of Digital Control Direct Current Source of the utility model;
Fig. 2 is the main circuit diagram of a kind of Digital Control Direct Current Source of the utility model;
Fig. 3 is the digital-control circuit schematic diagram of a kind of Digital Control Direct Current Source of the utility model;
In Fig. 1-3,1, the current source main circuit; 2, current source supply power supply; 3, digital-control circuit; 4, load; 5, D/A benchmark; 6, adjust pipe; 7, comparison amplifier; 8, A/D conversion; 9, single-chip microcomputer; 10, keyboard/display circuit.
Embodiment
As Figure 1-3, a kind of Digital Control Direct Current Source, it is characterized in that: described current source supply power supply 2 is digital- control circuit 3 and 1 power supply of current source main circuit, current source main circuit 1 is connected respectively to digital-control circuit 3 and load 4, digital-control circuit 3 is connected with keyboard/display circuit 10, provides direct supply thereby constitute Digital Control Direct Current Source for other electronic equipments.
The design of DC current source power supply 2:
Numerical control direct supply itself need be used several dissimilar power supplys, and they are respectively: the digital display circuit part+5V ,+the 12V power supply; Artificial circuit part+12V and-the 12V power supply.These power supplys can obtain through rectifying and wave-filtering by the transformer step-down of the many groups of output band tap again.
The digital display circuit circuit mainly is meant the single-chip computer control system circuit, its power unit comprises+5V and+two groups of D.C. regulated power supplies of 12V, wherein+the 5V power supply uses for single-chip microcomputer and other digital circuits, and+the 12V power supply is for the mimic channel use of singlechip control panel.5V power supply and 12V power supply all adopt the fixed stably depressor of three ends to form, and must be noted that " ground connection " of artificial circuit part and the processing of digital circuit " ground connection " here, adopt photoelectrical coupler to carry out the isolation of two kinds of ground connection on circuit.
The power supply of analog circuit controller spare is made up of ± two groups of power supplys of 12V, positive and negative power supply for current source part comparison amplifier 7 uses respectively, satisfying the requirement of circuit, and in circuit, adopted multiple interference protection measure, reduced effect of ripple control system.
The design of current source main circuit 1:
Electric main by single-phase fully controlled bridge rectification and capacitor filtering, obtains the direct current about 20V behind the transformer of 220/18 (50W).After passing through powerful three terminal regulator 7815 voltage stabilizings again, obtain stable 15V voltage.For guaranteeing that circuit satisfies the requirement of output 2000mA, load is connected on the front end of adjusting pipe, with sampling and the control that makes things convenient for circuital current.The reference voltage that sampled voltage and numeral are set during circuit working is compared, to regulate the size of stable electric current.This regulative mode is made up of two parts, a part is that analog sampling voltage and the given reference voltage of single-chip microcomputer are compared, another part is that current sample voltage is given single-chip microcomputer 9 measurements by A/D conversion 8 and shown that the while compares with the current value that single-chip microcomputer 9 is set, and carries out digitizing and regulates.Two parts acting in conjunction has improved the rapidity and the accuracy of system response.
Analog feedback control: all can cause the change in voltage on the sampling resistor Rs when Io changes when external voltage or load RL variation, produce reference voltages with the D/A benchmark 5 of single-chip microcomputer 9 controls and compare that the tube voltage drop of regulating adjustment pipe 6 keeps Io constant.
Numeral relatively controls: when Io changes, the variation of pressure drop Vs on the sampling resistor Rs is input to single-chip microcomputer 9 through A/D conversion 8, single-chip microcomputer 9 is promptly adjusted the D/A reference voltage through handling by D/A output, combine with analog feedback control and to reach accurate more fast control purpose, simultaneously, greatly reduce the ripple current of entire equipment.
The design of digital control circuit 3:
In the selection of CPU, selected the AT89C52 of atmel corp, AT89C52 is a kind of band 8K byte flicker programmable and erasable ROM (read-only memory).In current design, P0 mouth, P1 mouth, P2 mouth all use for the I/O mouth.Outer interruption 1 is a keyboard interrupt, adopts negative edge to trigger and interrupts, and drives timer 1.P0, P1 add the pull-up resistor of 5.1K when being used as the I/O mouth.The special-purpose chip X5045 that resets of reset circuit employing of single-chip microcomputer provides and resets.
A/D conversion chip TLV2543 is a kind of 12 bit switch electric capacity successive approximation converter that TI company produces, and chip has 11 analog input channels.The 2.5 volt reference voltages of its reference voltage for adopting MAX873 to provide, minimum explanation is 0.6mV voltage..12 A/D, selecting sampling resistor is 1 ohm, the D/A output resolution ratio is the electric current of 1mA, realizes stepping 1mA, can satisfy the design's requirement fully.
In the selection of D/A conversion chip,, therefore adopt 12 D/A owing to will consider the precision of control; Consider the modulus isolation simultaneously, adopted serial D/A; The linearity and the zero drift problem of changeing voltage for anti-external impressed current must adopt voltage-type D/A again; Consider the driving of output, the D/A of amplifier with voltage or emitter follower in selecting.Selected MAX531 for this reason.
D/A conversion chip MAX531 is that single 5V power supply that MAXIM company provides is powered, 12 bit serial digital to analog converters of built-in output buffering, has electrification reset and serial data output function, is convenient to make up daisy architecture, and its power consumption is 140 μ A only.Meet designing requirement fully.Data-interface and the SPI compatibility of while MAX531, this provides convenience for its application in Single Chip Microcomputer (SCM) system.As MAX531 with when having the single-chip microcomputer collaborative work of SPI interface, only need the respective signal line is connected and correctly be provided with the related register of single-chip microcomputer, the work of writing of corresponding software is simple.
In keyboard/display circuit 10, adopted charactron driving and keyboard control chip ZLG8279 to come supervisory keyboard and demonstration.ZLG7289B can directly drive 8 cloudy formula charactrons (or 64 independent LED) altogether, can also scan nearly 64 buttons of management simultaneously.When keyboard scan, taked the shake measure that disappears, therefore in program, needn't write the code of the shake that disappears in addition.Adopt SPI universal serial bus and interface microcontroller, only take several I/O mouth lines.The DATA of ZLG7289, CLK ,/CS receives P1.4, P1.5, the P1.6 of the P1 mouth of single-chip microcomputer respectively, and/KEY receives in the outer interruption 1 of single-chip microcomputer.Having designed 8 LED shows and 6 buttons: 4 show the electric current set-point in 8 light-emitting diode displays, and 4 show the actual output current value; 6 buttons are set current value respectively, are respectively setting, add 1, subtract 1, shift left, confirm, makeing mistakes resets.
In conjunction with the accompanying drawings the utility model has been carried out exemplary description above; obviously the utility model specific implementation is not subjected to the restriction of aforesaid way; as long as the various improvement of having adopted method design of the present utility model and technical scheme to carry out; or directly apply to other occasion without improvement, all within protection domain of the present utility model.
Claims (6)
1. Digital Control Direct Current Source, it is characterized in that: described current source supply power supply (2) is digital-control circuit (3) and current source main circuit (1) power supply, current source main circuit (1) is connected respectively to digital-control circuit (3) and load (4), and digital-control circuit (3) is connected with keyboard/display circuit (10).
2. a kind of Digital Control Direct Current Source according to claim 1, it is characterized in that: described current source main circuit (1) inserts power supply output for civil power process transformation and through after single-phase fully controlled bridge rectification and electric capacity (C13, the C14) filtering by the voltage stabilizing of three-phase voltage stabilizer.
3. a kind of Digital Control Direct Current Source according to claim 1 is characterized in that: described digital-control circuit (3) is to insert single-chip microcomputer (9) again after being connected to A/D conversion (8) with sampling resistor (RS) respectively behind load (RL) access adjustment pipe (6) and comparison amplifier (7), the D/A benchmark (5).
4. a kind of Digital Control Direct Current Source according to claim 1 is characterized in that: be provided with photoelectrical coupler in the described current source supply power supply (2).
5. a kind of Digital Control Direct Current Source according to claim 3 is characterized in that: the model of described single-chip microcomputer is AT89C52.
6. a kind of Digital Control Direct Current Source according to claim 2 is characterized in that: the model of described three-phase voltage stabilizer is LM7851CT.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010200625289U CN201600610U (en) | 2010-01-18 | 2010-01-18 | Numerical control direct current source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010200625289U CN201600610U (en) | 2010-01-18 | 2010-01-18 | Numerical control direct current source |
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| CN201600610U true CN201600610U (en) | 2010-10-06 |
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| CN2010200625289U Expired - Fee Related CN201600610U (en) | 2010-01-18 | 2010-01-18 | Numerical control direct current source |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106325350A (en) * | 2016-09-29 | 2017-01-11 | 中国电子科技集团公司第四十三研究所 | DC/DC converter output voltage control circuit |
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2010
- 2010-01-18 CN CN2010200625289U patent/CN201600610U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106325350A (en) * | 2016-09-29 | 2017-01-11 | 中国电子科技集团公司第四十三研究所 | DC/DC converter output voltage control circuit |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101006 Termination date: 20130118 |