CN202331253U - High-precision adjustable power supply based on operational amplifier - Google Patents
High-precision adjustable power supply based on operational amplifier Download PDFInfo
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- CN202331253U CN202331253U CN2011204571333U CN201120457133U CN202331253U CN 202331253 U CN202331253 U CN 202331253U CN 2011204571333 U CN2011204571333 U CN 2011204571333U CN 201120457133 U CN201120457133 U CN 201120457133U CN 202331253 U CN202331253 U CN 202331253U
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Abstract
The utility model discloses a high-precision adjustable power supply based on an operational amplifier. The high-precision adjustable power supply based on an operational amplifier comprises a high-precision voltage reference circuit, wherein an output end of the voltage reference circuit is connected with a resistance voltage dividing network; an output end of the resistance voltage dividing network is connected with a homodromous operational amplifier; and an output end Vout of the homodromous operational amplifier outputs a power voltage. The high-precision adjustable power supply based on an operational amplifier disclosed by the utility model has load characteristic greater than the reference output power, and high stability and low noise characteristics that a general linear voltage stabilizing power supply does not have; and the output voltage can be adjusted at will, and the circuit structure is simple and has high reliability.
Description
Technical field
The utility model relates to a kind of low power consumption power supply system, specifically is meant the high precision regulated power supply based on operational amplifier.
Background technology
Frequency standard sources is the oscillator and the accessory circuit thereof that can produce pin-point accuracy and high stability standard-frequency signal (like 5 megahertzes, 10 megahertz sinusoidal signals).It is as the punctual equipment of timing system, for some measuring equipment provides standard-frequency signal.The leading indicator that characterizes the frequency standard sources performance has frequency accuracy, frequency stability and frequency drift rate.Frequency accuracy is the actual value of frequency standard sources output frequency and the relative deviation of nominal value.Frequency stability representes that the frequency standard sources output frequency influences the random fluctuation characteristic of generation because of receiving random noise.Because the sampling time is different, the value of frequency stability is also often different.Traditionally the sampling time is called short-term frequency stability less than the frequency stability of second-time; And the sampling time is second-time above frequency stability is called long-term frequency stability, and its frequency drift rate is meant and receives unit, device aging to influence its output frequency linear changing relation in time of back.The difference of unit has a day drift rate, month drift rate and year drift rate in time.Time unification equipment in Aerospace Engineering high stable constant-temperature crystal oscillator commonly used and various atomic frequency standard are as frequency standard sources, and the data and the incident that make institute obtain, note down have strict unified time standard.In radar application field and frequency standard source generator; The pure high request of frequency spectrum to frequency signal is increasingly high; Obtain the best purity of frequency spectrum,, also require simultaneously this low noise of the amplifier of transmission wherein more little good more except pure will the getting well of frequency spectrum that requires frequency source generation itself.When making output amplifier, in the time of most of, all be the positive-negative power supply pattern that adopts, its benefit is to suppress the interference of common mode power supply, and it is smaller to import the superimposed noise of 0 level.Along with radar and frequency marking produce to the frequency degree of purity require increasingly high; The circuit of some is also increasingly high to the requirement of power supply; High voltage stability precision, low noise, simple in structure and special voltage; For common adjustable linear stabilized power supply, can not satisfy the demand of precision and noise, and the benchmark voltage stabilizer can not satisfy magnitude of voltage and demand electric current.
The utility model content
The purpose of the utility model is to provide a kind of high precision regulated power supply based on operational amplifier, and power supply system solves in the circuit demand and supply to particular power source.
The purpose of the utility model realizes through following technical proposals:
High precision regulated power supply based on operational amplifier; Comprise high-precision voltage reference circuit; The output terminal of voltage reference circuit is connected with resistance pressure-dividing network, and the output terminal of resistance pressure-dividing network is connected with operational amplifier in the same way, in the same way the output end vo ut output supply voltage of operational amplifier.The low noise voltage signal Vo of voltage reference circuit output high precision; Vo obtains voltage Vi through resistance pressure-dividing network; Vi through operational amplifier in the same way amplify just produced have high precision, low noise constant voltage voltage source; Operational amplifier has certain enlargement factor A in the same way, and through selecting different amplification A, perhaps regulating in the same way, the enlargement factor A of operational amplifier just can obtain the required power supply of client.
Described resistance pressure-dividing network comprises resistance R 1, and an end of resistance R 1 is connected with the output terminal of high-precision voltage reference circuit, the other end of resistance R 1 simultaneously with resistance R 2 and in the same way operational amplifier be connected resistance R 2 ground connection.Say that further resistance pressure-dividing network comprises the resistance R 1 and resistance R 2 of series connection; Potential point between resistance R 1 and the resistance R 2 is exported Vi as voltage after partial; Vi through operational amplifier in the same way amplify just produced have high precision, low noise constant voltage voltage source, and output Vout
Vout?=?A×V1?=?A×R2×Vo/（R1+R2）
The circuit precision of voltage regulation is analyzed, and can know that from following formula the output voltage of circuit is only relevant with input voltage, also relevant of its precision with the input voltage precision, and irrelevant with the variation of the voltage of power supply.Influencing the principal element of the voltage of operational amplifier input fluctuation, is that resistance in the circuit receives variation of ambient temperature and the resistance change that produces.
The temperature characterisitic of metallic resistance:
Temperature-coefficient of electrical resistance (PPM/ ℃)=(R 1-R O)/R 0 * 1 (t 1-t 0) * X106
R O in the following formula: the resistance value of in room temperature, measuring (Ω)
R1: the resistance value of in test flume, measuring (Ω)
T0: ambient temperature (℃)
T1: the test flume temperature (℃),
Know that from the temperature characterisitic of metallic resistance the variation of the resistance value that identical variation causes also is identical, and is monotone variation, suppose that the temperature coefficient of resistance is: Kt, bring temperature coefficient into following formula, obtain:
Vout?=?A×V1?=?A×R2×Kt×Vo/（R1×Kt?+R2×Kt）
=?A×R2×Vo×Kt/[（R1?+R2）×Kt]
=?A×R2×Vo/（R1?+R2）
Can confirm that from following formula select the metallic resistance of uniform temp coefficient, the variation of environment temperature will can not influence the variation of output voltage.
Said resistance R 1 is the potentiometer of adjustable resistance.Further say,, can adopt potentiometer to replace resistance R 1, make that the output Vi of resistance pressure-dividing network is adjustable, regulate the constant voltage power supply of output more easily in order to enlarge its range of adjustment.
The utility model compared with prior art has the following advantages:
The utility model has the load characteristic bigger than benchmark output power based on the high precision regulated power supply of operational amplifier; The high stability and the low-noise characteristic that have common linear stabilized power supply not have; Output voltage can be regulated arbitrarily; The simple and reliable property of circuit structure is high.
Description of drawings
Fig. 1 is the utility model circuit diagram.
Embodiment
Below in conjunction with embodiment the utility model is done further to specify, but the embodiment of the utility model is not limited thereto.
Embodiment
As shown in Figure 1, the utility model comprises high-precision voltage reference circuit based on the high precision regulated power supply of operational amplifier; The output terminal of voltage reference circuit is connected with resistance pressure-dividing network; The output terminal of resistance pressure-dividing network is connected with operational amplifier in the same way, the output end vo ut output supply voltage of operational amplifier in the same way, and wherein resistance pressure-dividing network comprises resistance R 1; One end of resistance R 1 is connected with the output terminal of high-precision voltage reference circuit; The other end of resistance R 1 simultaneously with resistance R 2 and in the same way operational amplifier be connected, resistance R 2 ground connection, resistance R 1 can adopt potentiometer.Operational amplifier adopts AD811 in the same way, and its parameter is: output current: 1mA, noise: 1.9 nV, resistance: select metalfilmresistor for use; Voltage reference circuit is core with AD587, and its parameter is: the voltage fluctuation of voltage reference :≤15mV (total temperature), noise :≤4uV, voltage accuracy: ± 5Mv.So, the output parameter of this circuit is: maximum output current: 100Ma, voltage: 7.5V, voltage source internal resistance :≤0.1 Ω, output noise :≤50uV.
As stated, just can realize the utility model well.
Claims (3)
1. based on the high precision regulated power supply of operational amplifier; It is characterized in that: comprise high-precision voltage reference circuit; The output terminal of voltage reference circuit is connected with resistance pressure-dividing network; The output terminal of resistance pressure-dividing network is connected with operational amplifier in the same way, in the same way the output end vo ut output supply voltage of operational amplifier.
2. the high precision regulated power supply based on operational amplifier according to claim 1; It is characterized in that: described resistance pressure-dividing network comprises resistance R 1; One end of resistance R 1 is connected with the output terminal of high-precision voltage reference circuit; The other end of resistance R 1 simultaneously with resistance R 2 and in the same way operational amplifier be connected resistance R 2 ground connection.
3. the high precision regulated power supply based on operational amplifier according to claim 2 is characterized in that: said resistance R 1 is the potentiometer of adjustable resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204571333U CN202331253U (en) | 2011-11-17 | 2011-11-17 | High-precision adjustable power supply based on operational amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204571333U CN202331253U (en) | 2011-11-17 | 2011-11-17 | High-precision adjustable power supply based on operational amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202331253U true CN202331253U (en) | 2012-07-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204571333U Expired - Fee Related CN202331253U (en) | 2011-11-17 | 2011-11-17 | High-precision adjustable power supply based on operational amplifier |
Country Status (1)
| Country | Link |
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| CN (1) | CN202331253U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104615186A (en) * | 2015-01-29 | 2015-05-13 | 深圳市辰卓科技有限公司 | High-precision adjustable power supply circuit |
| CN111984055A (en) * | 2020-08-20 | 2020-11-24 | 山东云海国创云计算装备产业创新中心有限公司 | Integrated circuit and reference voltage generating circuit thereof |
-
2011
- 2011-11-17 CN CN2011204571333U patent/CN202331253U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104615186A (en) * | 2015-01-29 | 2015-05-13 | 深圳市辰卓科技有限公司 | High-precision adjustable power supply circuit |
| CN111984055A (en) * | 2020-08-20 | 2020-11-24 | 山东云海国创云计算装备产业创新中心有限公司 | Integrated circuit and reference voltage generating circuit thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: The middle Tianfu Avenue in Chengdu city Sichuan province 610000 No. 1366 2 4 storey building 1-3 No. Patentee after: Chengdu for Polytron Technologies Inc Address before: 610000 Sichuan province Chengdu Tianfu Avenue high-tech incubator Park 5-1-12 Patentee before: CHENGDU COVE TECHNOLOGY CO., LTD. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120711 Termination date: 20171117 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |