CN205067545U - Low temperature floats reference circuit - Google Patents
Low temperature floats reference circuit Download PDFInfo
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- CN205067545U CN205067545U CN201520820797.XU CN201520820797U CN205067545U CN 205067545 U CN205067545 U CN 205067545U CN 201520820797 U CN201520820797 U CN 201520820797U CN 205067545 U CN205067545 U CN 205067545U
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Abstract
The utility model provides a low temperature floats reference circuit, it relates to a reference circuit. The utility model discloses a reference circuit in order to solve prior art is influenced greatly by the temperature variation in the course of the work, poor stability, the problem of circuit structure complicacy. The utility model discloses a first resistor is connected to power supply circuit's first output, first voltage follower circuit is connected respectively to the output of first resistor, A third voltage follower circuit and fourth voltage follower circuit's input, first voltage follower circuit's output passes through the input that second voltage follower circuit is connected to the second resistor, A third voltage follower circuit's output passes through the input that the reverse circuit of first voltage is connected to the third resistor, fourth voltage follower circuit's output is voltage output end, second voltage follower circuit's output is the 2nd voltage output end, the output of the reverse circuit of first voltage is the A third voltage output. The utility model provides high output voltage's stability, circuit structure is simple, easily builds.
Description
Technical field
The utility model relates to a kind of reference circuit, is specifically related to a kind of Low Drift Temperature reference circuit, belongs to reference circuit technical field.
Background technology
Prior art requires more and more higher to the output output stability of voltage reference circuit, especially in multimeter hardware circuit design, the stability of voltage reference circuit determines the measuring accuracy of multimeter, and the topological structure of reference circuit after being powered up, the reasons in structure of electronic component self-heating and circuit, can be that the temperature of each electronic component in circuit changes, reference circuit is made also unavoidably to be subject to the restriction of the extraneous factors such as temperature variation, cause output voltage unstable, there is the situation of output voltage drift, and then have impact on other equipment subsequent action, cause and cannot eliminate big error, have impact on the measuring accuracy of the instruments such as multimeter.
Utility model content
The purpose of this utility model is that the reference circuit in order to solve prior art is large by influence of temperature change in the course of the work, poor stability, the problem of circuit structure complexity.
The technical solution of the utility model is: a kind of Low Drift Temperature reference circuit, comprise power circuit and reference voltage generating circuit, described reference voltage generating circuit comprises the first resistor, second resistor, 3rd resistor, first voltage follower circuit, second voltage follower circuit, tertiary voltage follow circuit, 4th voltage follower circuit and the first voltage reversal circuit, first output terminal of described power circuit connects the first resistor, the output terminal of the first resistor connects the first voltage follower circuit respectively, the input end of tertiary voltage follow circuit and the 4th voltage follower circuit, the output terminal of the first voltage follower circuit connects the input end of the second voltage follower circuit by the second resistor, the output terminal of tertiary voltage follow circuit connects the input end of the first voltage reversal circuit by the 3rd resistor, the output terminal of described 4th voltage follower circuit is the first voltage output end, the output terminal of the second voltage follower circuit is the second voltage output end, the output terminal of the first voltage reversal circuit is tertiary voltage output terminal.
Described first resistor comprises the first resistance, the second resistance, the 3rd resistance and the 4th resistance, 3rd resistance and the 4th resistor coupled in parallel, the parallel circuit in series that first resistance, the second resistance and the 3rd resistance and the 4th resistance are formed, first output terminal of power circuit connects one end of the first resistance, and the input end of the input end of the first voltage follower circuit, the input end of tertiary voltage follow circuit and the 4th voltage follower circuit is all connected between the second resistance and the 4th resistance.
Described 3rd resistor comprises the 5th resistance, the 6th resistance and the 7th resistance of connecting successively, the output terminal of described tertiary voltage follow circuit connects one end of the 5th resistance, the input end of the first voltage reversal circuit is connected between the 6th resistance and the 7th resistance, and the other end of the 7th resistance connects the output terminal of the first voltage reversal circuit.
Described power circuit comprises power supply, reduction voltage circuit, mu balanced circuit and the 5th voltage follower circuit, the output terminal of power supply is connected by the input end of reduction voltage circuit and mu balanced circuit, the output terminal of mu balanced circuit connects the 5th voltage follower circuit input end, and the output terminal of the 5th voltage follower circuit is the first output terminal of power circuit.
Described mu balanced circuit comprises voltage stabilizing chip and feedback circuit, described feedback circuit comprises operational amplifier, the output terminal of described reduction voltage circuit connects the output terminal of voltage stabilizing chip and the in-phase input end of operational amplifier respectively, the output terminal of operational amplifier passes through the in-phase input end of feedback resistance concatenation operation amplifier, the in-phase input end of the output terminal of described reduction voltage circuit, the output terminal of voltage stabilizing chip and operational amplifier all connects with the input end of the 5th voltage follower circuit, and the output terminal of described operational amplifier is the second output terminal of power circuit.
The output voltage of power supply, is constantly fed back by feedback circuit, and the output terminal output voltage making voltage stabilizing chip is stable.Stablizing by voltage stabilizing chip guarantee power circuit output voltage.
Described mu balanced circuit comprises the 8th resistance and the 9th resistance, and the output terminal of described operational amplifier is connected ground connection after the 8th resistance and the 9th resistance successively, and the inverting input of operational amplifier is connected between the 8th resistance and the 9th resistance by wire.
Described reduction voltage circuit comprises voltage stabilizing diode, divider resistance, electric capacity and fly-wheel diode, the output terminal of power supply connects the positive pole of the negative pole of voltage stabilizing diode, one end of electric capacity and fly-wheel diode respectively by divider resistance, the plus earth of voltage stabilizing diode, the other end ground connection of electric capacity, the output terminal of fly-wheel diode is the output terminal of reduction voltage circuit.
Described a kind of Low Drift Temperature reference circuit comprises the second voltage reversal circuit and resistance measuring circuit, first output terminal of described power circuit connects the input end of the second voltage reversal circuit by the second resistor, the output terminal contact resistance metering circuit of the second voltage reversal circuit.
The utility model compared with prior art has following effect: prime power circuit stable output of the present utility model, Leakage Current is extremely low, the indices of amplifier reaches the highest, described first resistor realizes the amplification in the same way of voltage, and each output voltage temperature influence of reference voltage generating circuit is little, output voltage stabilization, the utility model effectively overcomes the impact of temperature variation on reference circuit, improve the stability of output voltage, circuit structure is simple, is easy to build.
Accompanying drawing explanation
Fig. 1, structured flowchart of the present utility model;
Fig. 2, circuit diagram of the present utility model;
Fig. 3, the schematic equivalent circuit of the first resistor of the present utility model;
Fig. 4, the schematic equivalent circuit of the 3rd resistor of the present utility model and the first voltage reversal circuit.
Embodiment
Accompanying drawings embodiment of the present utility model, a kind of Low Drift Temperature reference circuit of present embodiment, comprise power circuit 10 and reference voltage generating circuit, described reference voltage generating circuit comprises the first resistor 1, second resistor 2, 3rd resistor 3, first voltage follower circuit 4, second voltage follower circuit 5, tertiary voltage follow circuit 6, 4th voltage follower circuit 7 and the first voltage reversal circuit 8, first output terminal of described power circuit 10 connects the first resistor 1, the output terminal of the first resistor 1 connects the first voltage follower circuit 4 respectively, the input end of tertiary voltage follow circuit 6 and the 4th voltage follower circuit 7, first voltage follower circuit 4 connects the input end of the second voltage follower circuit 5 by the second resistor 2, the output terminal of tertiary voltage follow circuit 6 connects the input end of the first voltage reversal circuit 8 by the 3rd resistor 3, the output terminal of described 4th voltage follower circuit 7 is the first voltage output end Uo1, the output terminal of the second voltage follower circuit 5 is the second voltage output end Uo2, the output terminal of the first voltage reversal circuit 8 is tertiary voltage output terminal Uo3.
As shown in Figure 3, described first resistor 1 comprises the first resistance R1, the second resistance R2, the 3rd resistance R3 and the 4th resistance R4,3rd resistance R3 and the 4th resistance R4 is in parallel, the parallel circuit in series that first resistance R1, the second resistance R2 and the 3rd resistance R3 and the 4th resistance R4 are formed, first output terminal of power circuit 10 connects one end of the first resistance R1, and the input end of the input end of the first voltage follower circuit 4, the input end of tertiary voltage follow circuit 6 and the 4th voltage follower circuit 7 is all connected between the second resistance R2 and the 4th resistance R4.First resistance R1 of present embodiment and the resistance of the second resistance R2 are 10K, and the resistance of the 3rd resistance R3 and the 4th resistance R4 is 100K.
As shown in Figure 4, described 3rd resistor 3 comprises the 5th resistance R5, the 6th resistance R6 and the 7th resistance R7 that connect successively, the output terminal of described tertiary voltage follow circuit 6 connects one end of the 5th resistance R5, the input end of the first voltage reversal circuit 8 is connected between the 6th resistance R6 and the 7th resistance R7, and the other end of the 7th resistance R7 connects the output terminal of the first voltage reversal circuit 8.
Described power circuit 10 comprises power supply 10-1, reduction voltage circuit 10-2, mu balanced circuit and the 5th voltage follower circuit 10-4, the output terminal of power supply 10-1 is connected by the input end of reduction voltage circuit 10-2 and mu balanced circuit, the output terminal of mu balanced circuit connects the 5th voltage follower circuit 10-4 input end, and the output terminal of the 5th voltage follower circuit 10-4 is the first output terminal of power circuit 10.
Described mu balanced circuit comprises voltage stabilizing chip 10-3-1 and feedback circuit 10-3-2, described feedback circuit 10-3-2 comprises operational amplifier U, the output terminal of described reduction voltage circuit 10-2 connects the output terminal of voltage stabilizing chip 10-3-1 and the in-phase input end of operational amplifier U respectively, the output terminal of operational amplifier U passes through the in-phase input end of feedback resistance Rs concatenation operation amplifier U, the output terminal of described reduction voltage circuit 10-2, the output terminal of voltage stabilizing chip 10-3-1 and the in-phase input end of operational amplifier U all connect with the input end of the 5th voltage follower circuit 10-4, the output terminal of described operational amplifier U is the second output terminal of power circuit 10.
Described mu balanced circuit comprises the 8th resistance R8 and the 9th resistance R9, the output terminal of described operational amplifier U and the 8th resistance R8 and the 9th resistance R9 are sequentially connected in series rear ground connection, and the inverting input of operational amplifier U is connected between the 8th resistance R8 and the 9th resistance R9 by wire.8th resistance R8 and the 9th resistance R9 of present embodiment are fixed proportion, 8th resistance R8 and the 9th resistance R9 selects precision to be 1%, temperature drift is the precision resistance of 2ppm/ DEG C, by the effect of the 8th resistance R8, the 9th resistance R9 and feedback resistance Rs, second output terminal of the defeated i.e. power supply 10-1 of the output terminal of operational amplifier U is made to export 10V burning voltage.
Described reduction voltage circuit 10-2 comprises voltage stabilizing diode ZD, divider resistance Rd, electric capacity C and sustained diode, the output terminal of power supply 10-1 connects one end of the negative pole of voltage stabilizing diode ZD, the positive pole of sustained diode and electric capacity C respectively by divider resistance Rd, the plus earth of voltage stabilizing diode ZD, the other end ground connection of electric capacity C, the output terminal of sustained diode is the output terminal of reduction voltage circuit 10-2.
Described a kind of Low Drift Temperature reference circuit comprises the second voltage reversal circuit 9 and resistance measuring circuit 11, first output terminal of described power circuit 10 connects the input end of the second voltage reversal circuit 9 by the second resistor 2, the output terminal contact resistance metering circuit 11 of the second voltage reversal circuit 9.
First voltage follower circuit 4, second voltage follower circuit 5 of present embodiment, tertiary voltage follow circuit 6, the 4th voltage follower circuit 7, the 5th voltage follower circuit 10-4, the first voltage reversal circuit 8, second voltage reversal circuit 9 and feedback circuit 10-3-2 include operational amplifier, and its model is AD706;
The model that the voltage stabilizing chip 10-3-1 of present embodiment adopts is LM399AH, for ohms current source provides the chip of voltage reference to be the high precision reference LM399 that National Semiconductor (NationalSemiconductor) produces, belong to army's grade, and industrial goods and civilian goods are respectively LM299, LM199.It has remarkable temperature stability in very wide voltage, temperature and current margin.By a stable well heater and active Zener diode being incorporated on an one chip substrate, thus eliminate the change that voltage occurs with temperature.
LM399 has following characteristics:
1.6.95V benchmark in parallel;
2. temperature coefficient is 0.3ppm/ DEG C;
3. maximum motional impedance is 1.5 Ω.
The specific works process of present embodiment is: power supply 10-1 exports 15V voltage, 7V is depressurized to through reduction voltage circuit 10-2, generated by the acting in conjunction of voltage stabilizing chip 10-3-1 and feedback circuit 10-3-2 and stablize 7V voltage, export after putting forward high-tension load-bearing capacity by the 5th voltage follower circuit 10-4, through the first resistor 1 carry out 5/7 times in the same way amplify after export 5V voltage;
The 5V voltage exported by the first resistor 1 exports 5V voltage after the load-bearing capacity that the 4th follower strengthens voltage, and namely the first voltage output end Uo1 exports 5V voltage;
The 5V voltage that first resistor 1 exports exports 2.5V voltage through the step-down of the first voltage follower circuit 4, second resistor 2 and the effect of the second voltage follower circuit 5, and namely the second voltage output end Uo2 exports 2.5V voltage;
The 5V voltage that first resistor 1 exports, after the step-down of tertiary voltage follow circuit 6, the 3rd resistor 3 and the first voltage reversal circuit 8 make voltage reversal effect, exports-2.5V voltage, and namely tertiary voltage output terminal Uo3 exports-2.5V voltage;
The 7V voltage of the first output terminal output of power circuit 10, through the second resistor 2 step-down, exports-7V voltage, for resistance measuring circuit is powered by the acting in opposition of the second voltage reversal circuit 9.
Claims (8)
1. a Low Drift Temperature reference circuit, comprise power circuit and reference voltage generating circuit, it is characterized in that: described reference voltage generating circuit comprises the first resistor, second resistor, 3rd resistor, first voltage follower circuit, second voltage follower circuit, tertiary voltage follow circuit, 4th voltage follower circuit and the first voltage reversal circuit, first output terminal of described power circuit connects the first resistor, the output terminal of the first resistor connects the first voltage follower circuit respectively, the input end of tertiary voltage follow circuit and the 4th voltage follower circuit, the output terminal of the first voltage follower circuit connects the input end of the second voltage follower circuit by the second resistor, the output terminal of tertiary voltage follow circuit connects the input end of the first voltage reversal circuit by the 3rd resistor, the output terminal of described 4th voltage follower circuit is the first voltage output end, the output terminal of the second voltage follower circuit is the second voltage output end, the output terminal of the first voltage reversal circuit is tertiary voltage output terminal.
2. a kind of Low Drift Temperature reference circuit according to claim 1, it is characterized in that: described first resistor comprises the first resistance, the second resistance, the 3rd resistance and the 4th resistance, 3rd resistance and the 4th resistor coupled in parallel, the parallel circuit in series that first resistance, the second resistance and the 3rd resistance and the 4th resistance are formed, first output terminal of power circuit connects one end of the first resistance, and the input end of the input end of the first voltage follower circuit, the input end of tertiary voltage follow circuit and the 4th voltage follower circuit is all connected between the second resistance and the 4th resistance.
3. a kind of Low Drift Temperature reference circuit according to claim 1, it is characterized in that: described 3rd resistor comprises the 5th resistance, the 6th resistance and the 7th resistance of connecting successively, the output terminal of described tertiary voltage follow circuit connects one end of the 5th resistance, the input end of the first voltage reversal circuit is connected between the 6th resistance and the 7th resistance, and the other end of the 7th resistance connects the output terminal of the first voltage reversal circuit.
4. a kind of Low Drift Temperature reference circuit according to claim 1, it is characterized in that: described power circuit comprises power supply, reduction voltage circuit, mu balanced circuit and the 5th voltage follower circuit, the output terminal of power supply is connected by the input end of reduction voltage circuit and mu balanced circuit, the output terminal of mu balanced circuit connects the 5th voltage follower circuit input end, and the output terminal of the 5th voltage follower circuit is the first output terminal of power circuit.
5. a kind of Low Drift Temperature reference circuit according to claim 4, it is characterized in that: described mu balanced circuit comprises voltage stabilizing chip and feedback circuit, described feedback circuit comprises operational amplifier, the output terminal of described reduction voltage circuit connects the output terminal of voltage stabilizing chip and the in-phase input end of operational amplifier respectively, the output terminal of operational amplifier passes through the in-phase input end of feedback resistance concatenation operation amplifier, the output terminal of described reduction voltage circuit, the output terminal of voltage stabilizing chip and the in-phase input end of operational amplifier all connect with the input end of the 5th voltage follower circuit, the output terminal of described operational amplifier is the second output terminal of power circuit.
6. a kind of Low Drift Temperature reference circuit according to claim 5, it is characterized in that: described mu balanced circuit comprises the 8th resistance and the 9th resistance, the output terminal of described operational amplifier is connected ground connection after the 8th resistance and the 9th resistance successively, and the inverting input of operational amplifier is connected between the 8th resistance and the 9th resistance by wire.
7. a kind of Low Drift Temperature reference circuit according to claim 4, it is characterized in that: described reduction voltage circuit comprises voltage stabilizing diode, divider resistance, electric capacity and fly-wheel diode, the output terminal of power supply connects the positive pole of the negative pole of voltage stabilizing diode, one end of electric capacity and fly-wheel diode respectively by divider resistance, the plus earth of voltage stabilizing diode, the other end ground connection of electric capacity, the output terminal of fly-wheel diode is the output terminal of reduction voltage circuit.
8. a kind of Low Drift Temperature reference circuit according to claim 1, it is characterized in that: described a kind of Low Drift Temperature reference circuit comprises the second voltage reversal circuit and resistance measuring circuit, first output terminal of described power circuit connects the input end of the second voltage reversal circuit by the second resistor, the output terminal contact resistance metering circuit of the second voltage reversal circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520820797.XU CN205067545U (en) | 2015-10-21 | 2015-10-21 | Low temperature floats reference circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520820797.XU CN205067545U (en) | 2015-10-21 | 2015-10-21 | Low temperature floats reference circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205067545U true CN205067545U (en) | 2016-03-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520820797.XU Expired - Fee Related CN205067545U (en) | 2015-10-21 | 2015-10-21 | Low temperature floats reference circuit |
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| CN (1) | CN205067545U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114326909A (en) * | 2021-12-21 | 2022-04-12 | 江苏润石科技有限公司 | Low-temperature drift reference source circuit |
-
2015
- 2015-10-21 CN CN201520820797.XU patent/CN205067545U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114326909A (en) * | 2021-12-21 | 2022-04-12 | 江苏润石科技有限公司 | Low-temperature drift reference source circuit |
| CN114326909B (en) * | 2021-12-21 | 2024-05-10 | 江苏润石科技有限公司 | Low temperature drift reference source 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: 20160302 Termination date: 20161021 |