CN205302071U - Adjustable accurate reference voltage's output circuit - Google Patents
Adjustable accurate reference voltage's output circuit Download PDFInfo
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- CN205302071U CN205302071U CN201521103426.6U CN201521103426U CN205302071U CN 205302071 U CN205302071 U CN 205302071U CN 201521103426 U CN201521103426 U CN 201521103426U CN 205302071 U CN205302071 U CN 205302071U
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- stabilivolt
- resistance
- reference voltage
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Abstract
The utility model relates to an adjustable accurate reference voltage's output circuit, including power supply switch circuit and steady voltage output circuit, power supply switch circuit does steady voltage output circuit provides stable power, steady voltage output circuit includes operational amplifier, stabilivolt and adjustable resistance, the negative pole of stabilivolt links to each other positive electrode groud through resistance and testing power supply end, operational amplifier's non -inverting input end links to each other with the negative pole of stabilivolt, and the inverting input end links to each other with the inverting input end through a feedback resistance through an adjustable resistance ground connection, output. The utility model discloses can export the high accuracy reference voltage of high voltage value.
Description
Technical field
This utility model relates to reference voltage output circuit, particularly relates to the output circuit of a kind of adjustable Precision reference voltage.
Background technology
Reference voltage refer in circuit one unrelated with load, power supply, temperature drift, time etc., a constant all the time voltage can be kept. Reference voltage can be used to the manostat of power system, analog-digital converter and digital analog converter, and many other are measured, controlled system. The size of reference voltage is different in different applications, such as in general computer power supply supply system, reference voltage error is not more than near its nominal value one of percentage between a few percent, the reference voltage standard of laboratory then have higher, with the stability of PPM tolerance and degree of accuracy.
Prior art to provide accurately reference voltage time, be usually with ready-made reference voltage IC, but generally precision its price more high be more high, and can the selectivity of output HIGH voltage value less.
Utility model content
Technical problem to be solved in the utility model is to provide the output circuit of a kind of adjustable Precision reference voltage, it is possible to the high precision reference voltage of output higher voltage value.
This utility model solves its technical problem and be the technical scheme is that the output circuit providing a kind of adjustable Precision reference voltage, including power switch circuit and voltage-stabilizing output circuit, described power switch circuit provides stable power supply for described voltage-stabilizing output circuit; Described voltage-stabilizing output circuit includes operational amplifier, stabilivolt and variable resistance; The negative pole of described stabilivolt is connected with test power end by a resistance, plus earth; The normal phase input end of described operational amplifier is connected with the negative pole of stabilivolt, and inverting input passes through a variable resistance ground connection, and outfan is connected with inverting input by a feedback resistance.
Described power switch circuit includes NPN type triode and PNP type triode, and the base stage of described NPN type triode connects enable signal, and colelctor electrode is connected with the base stage of PNP type triode, grounded emitter; The emitter stage of described PNP type triode connects power supply, and colelctor electrode is connected with the positive power source terminal of described operational amplifier.
The resistance of described feedback resistance and the resistance connected with stabilivolt negative pole is identical.
Described variable resistance is slide rheostat.
Described stabilivolt is 2.5V stabilivolt.
Beneficial effect
Owing to have employed above-mentioned technical scheme, this utility model is compared with prior art, have the following advantages that and good effect: this utility model uses two audions to provide appropriate voltage power supply as power switch circuit, again with operational amplifier and stabilivolt, resistance and variable-resistance combination, utilize the characteristic principle of operational amplifier will export into set reference voltage level after amplifying by voltage work accurately. This utility model uses more typically and cheap Element Design goes out to have the high precision reference voltage of higher voltage value, so in design can be more flexible so that the part consumption of high unit price reduces and simplification of standards.
Accompanying drawing explanation
Fig. 1 is circuit diagram of the present utility model.
Detailed description of the invention
Below in conjunction with specific embodiment, this utility model is expanded on further. Should be understood that these embodiments are merely to illustrate this utility model rather than limit scope of the present utility model. In addition, it is to be understood that after having read the content that this utility model is lectured, this utility model can be made various changes or modifications by those skilled in the art, and these equivalent form of values fall within the application appended claims limited range equally.
Embodiment of the present utility model relates to the output circuit of a kind of adjustable Precision reference voltage, as it is shown in figure 1, include power switch circuit and voltage-stabilizing output circuit, described power switch circuit provides stable power supply for described voltage-stabilizing output circuit; Described voltage-stabilizing output circuit includes operational amplifier, stabilivolt Q7 and variable resistance VR5; The negative pole of described stabilivolt Q7 is connected with test power end by a resistance R40, plus earth; The normal phase input end of described operational amplifier is connected with the negative pole of stabilivolt Q7, and inverting input passes through a variable resistance VR5 ground connection, and outfan is connected with inverting input by a feedback resistance R41. A resistance R44 it is also associated with between the inverting input of variable resistance VR5 and described operational amplifier.
Described power switch circuit includes the base stage of NPN type triode Q6 and PNP type triode Q5, described NPN type triode Q6 and connects enable signal, and colelctor electrode is connected with the base stage of PNP type triode Q5, grounded emitter; The emitter stage of described PNP type triode Q5 connects power supply, and colelctor electrode is connected with the positive power source terminal of described operational amplifier. Wherein, in order to whole circuit is more stable, it is also associated with resistance R45 between NPN type triode Q6 and enable signal, being also associated with resistance R43 between the colelctor electrode and the base stage of PNP type triode Q5 of NPN type triode Q6, power supply is connected also by the colelctor electrode of resistance R42 and NPN type triode Q6.
This utility model uses two audions to provide appropriate voltage power supply as power switch circuit, again with operational amplifier and stabilivolt, resistance and variable-resistance combination, utilize the characteristic principle of operational amplifier will export into set reference voltage level after amplifying by voltage work accurately. This utility model uses more typically and cheap Element Design goes out to have the high precision reference voltage of higher voltage value, so in design can be more flexible so that the part consumption of high unit price reduces and simplification of standards.
Reference voltage to export 10V below, is further illustrated circuit workflow, now, in circuit, the resistance of each resistance is as follows: R42=10k ��, R43=330 ��, R45=5.1k ��, R40=7.5k ��, R41=7.5k ��, R44=2.2k ��.
Enable signal EN_PFVREF and send the high level base stage to NPN type triode Q6, PNP type triode Q5 and NPN type triode Q6 the power switch circuit combined makes the power supply of 15V be provided that the positive power source terminal of described operational amplifier of voltage-stabilizing output circuit.
Stabilivolt Q7 obtains producing after enough collapse electric currents stable 2.5V voltage through resistance R40, and is delivered to the normal phase input end of operational amplifier, the now voltage V+=2.5V of the normal phase input end of operational amplifier. Utilize the operational amplifier normal phase input end voltage V+ characteristic equal to the voltage V-of inverting input, it is possible to obtain the voltage V-=2.5V of the inverting input of operational amplifier. Regulating the resistance of variable resistance VR5, can obtain the reference voltage VREF=V-(R41+VR5+R44/R44+VR5) of the output wanted further according to the law of partial pressure, as VR5=300 ��, reference voltage VREF is 10V.
Claims (5)
1. an output circuit for adjustable Precision reference voltage, including power switch circuit and voltage-stabilizing output circuit, it is characterised in that described power switch circuit provides stable power supply for described voltage-stabilizing output circuit; Described voltage-stabilizing output circuit includes operational amplifier, stabilivolt and variable resistance; The negative pole of described stabilivolt is connected with test power end by a resistance, plus earth; The normal phase input end of described operational amplifier is connected with the negative pole of stabilivolt, and inverting input passes through a variable resistance ground connection, and outfan is connected with inverting input by a feedback resistance.
2. the output circuit of adjustable Precision reference voltage according to claim 1, it is characterized in that, described power switch circuit includes NPN type triode and PNP type triode, the base stage of described NPN type triode connects enable signal, colelctor electrode is connected with the base stage of PNP type triode, grounded emitter; The emitter stage of described PNP type triode connects power supply, and colelctor electrode is connected with the positive power source terminal of described operational amplifier.
3. the output circuit of adjustable Precision reference voltage according to claim 1, it is characterised in that the resistance of described feedback resistance and the resistance connected with stabilivolt negative pole is identical.
4. the output circuit of adjustable Precision reference voltage according to claim 1, it is characterised in that described variable resistance is slide rheostat.
5. the output circuit of adjustable Precision reference voltage according to claim 1, it is characterised in that described stabilivolt is 2.5V stabilivolt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521103426.6U CN205302071U (en) | 2015-12-25 | 2015-12-25 | Adjustable accurate reference voltage's output circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521103426.6U CN205302071U (en) | 2015-12-25 | 2015-12-25 | Adjustable accurate reference voltage's output circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205302071U true CN205302071U (en) | 2016-06-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521103426.6U Active CN205302071U (en) | 2015-12-25 | 2015-12-25 | Adjustable accurate reference voltage's output circuit |
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| Country | Link |
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| CN (1) | CN205302071U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112379246A (en) * | 2020-11-17 | 2021-02-19 | 西安卓越智动科技有限公司 | Thin film type pressure sensor interface circuit debugging method based on wearable equipment |
| CN114610105A (en) * | 2022-04-21 | 2022-06-10 | 绵阳惠科光电科技有限公司 | Reference voltage circuit, gamma voltage circuit and display device |
-
2015
- 2015-12-25 CN CN201521103426.6U patent/CN205302071U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112379246A (en) * | 2020-11-17 | 2021-02-19 | 西安卓越智动科技有限公司 | Thin film type pressure sensor interface circuit debugging method based on wearable equipment |
| CN112379246B (en) * | 2020-11-17 | 2024-05-17 | 西北机电工程研究所 | Method for debugging interface circuit of thin film type pressure sensor based on wearable equipment |
| CN114610105A (en) * | 2022-04-21 | 2022-06-10 | 绵阳惠科光电科技有限公司 | Reference voltage circuit, gamma voltage circuit and display device |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |