CN201654110U - Device for measuring relative voltage - Google Patents
Device for measuring relative voltage Download PDFInfo
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- CN201654110U CN201654110U CN2010201791290U CN201020179129U CN201654110U CN 201654110 U CN201654110 U CN 201654110U CN 2010201791290 U CN2010201791290 U CN 2010201791290U CN 201020179129 U CN201020179129 U CN 201020179129U CN 201654110 U CN201654110 U CN 201654110U
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Abstract
The utility model relates to a device for measuring a relative voltage, which comprises an input voltage sampling circuit, a voltage following circuit, a difference proportion operation amplifying circuit and an insert proportion operation amplifying circuit, wherein the input voltage sampling circuit is used for converting voltages of two measured points into potentials relative to a reference voltage; the voltage following circuit is used for buffering and isolating a front-level circuit and a rear-level circuit and ensuring the voltage obtained by the sampling circuit is kept unchangeable and the input impedance is improved; the difference proportion operation amplifying circuit is used as an input state and a middle state of integrated operation for amplifying the voltage which passes through the voltage following circuit; and the invert proportion operation amplifying circuit is used for converting the voltage of the difference proportion operation amplifying circuit into a voltage difference relative to the reference voltage. By adopting the technical scheme of the utility model, the device adopting an optimized circuit structure has simple structure, high precision, practicality and convenience, and can be used for directly measuring the relative voltage on a plurality of elements in the measurement circuit; meanwhile, the device has no special requirements on a working power supply and voltage measuring range not limited by the working voltage.
Description
Technical field
The utility model relates to a kind of measurement mechanism of measuring relative voltage, particularly a kind of voltage measuring apparatus that is applicable to the middle school science experimental teaching.
Background technology
Measuring relative voltage, promptly is to measure the potential difference (PD) between 2 in the circuit-under-test.Traditional mode is the voltage of measuring respectively on the discrete component, obtains the relative voltage value again through converting.In measured circuit,, must overcome the influence of current potential on each element if measure voltage (potential difference (PD)) on a plurality of elements simultaneously.
The measurement mechanism of the relative voltage on a kind of multicomponent that can directly measure simultaneously in the same circuit is provided in the market, is that the Chinese patent ZL00247426.3 on August 25th, 2000 discloses the utility model of a kind of " a kind of relative voltage measurement mechanism " by name as the applying date.This relative voltage measurement mechanism is made up of metering circuit and change-over circuit, it is characterized in that change-over circuit comprises prime forward operation amplifier, prime negative sense operational amplifier, differential pressure resistance, final stage differential pressure operational amplifier, the relative voltage on each element in the same circuit can be directly measured simultaneously, the relative voltage of any point-to-point transmission in the circuit-under-test can be measured.
Analyze the operating circuit of this utility model, if want operate as normal, this relative voltage measurement mechanism must satisfy following condition:
(1) working power of this relative voltage measurement mechanism must be the negative and positive dual power of degree of precision, and negative and positive dual power should be equivalent.
(2) absolute value of the working power of this relative voltage measurement mechanism must be greater than the supply voltage of circuit-under-test.
(3) the relative voltage measurement range of this relative voltage measurement mechanism is limited by the working power of itself.
Have only when above-mentioned 3 conditions satisfy, this relative voltage measurement mechanism just can be measured the relative voltage of any point-to-point transmission in the circuit-under-test.This restriction for measuring relative voltage is bigger, makes the work of measuring must satisfy too much objective condition, for surveying work brings difficulty.
The utility model explanation
The technical matters that the utility model solves is, because the restriction of circuit theory in the prior art, arrange unreasonable, and requiring for working power of causing is too high, the measurement range of relative voltage is limited by the problem of the working power of itself, and then a kind of measurement mechanism of optimizing the relative voltage of circuit structure is provided.
The technical scheme that the utility model adopted is that a kind of measurement mechanism of measuring relative voltage comprises in the described measurement mechanism: the input voltage sample circuit is used for the current potential of two measured point voltage transitions one-tenth with respect to reference voltage; Voltage follower circuit, be used to cushion with isolate before the input impedance that remains unchanged of late-class circuit and voltage that sample circuit is obtained improve; Difference ratio operational amplification circuit amplifies through the voltage behind the voltage follower circuit as the input stage and the intergrade of integrated computing; Anti-phase scale operation amplifying circuit will become the voltage difference with respect to reference voltage through the voltage transitions of differential ratio column operations amplifying circuit.
Preferably, described input voltage sample circuit is made up of positive input and the negative input voltage circuit with respect to reference voltage resistance R 1, resistance R 3 and resistance R 2, resistance R 7, wherein, and R1=R2, R3=R7.
Preferably, described voltage follower circuit is finished by prime forward operation amplifier and prime negative sense operational amplifier co-operation.
Preferably, described difference ratio operational amplification circuit is made up of resistance R 4, R8, R6, R9 and operational amplifier, wherein, and R4=R6, R8=R9.
Preferably, described anti-phase scale operation amplifying circuit is made up of resistance R 5, R10, R11 and operational amplifier.
Adopt technical scheme provided by the utility model, the measurement mechanism of measuring relative voltage has adopted a kind of circuit structure of optimization, simple in structure, the precision height, practical and convenient, can be directly the relative voltage on a plurality of components and parts in the metering circuit simultaneously, and measurement mechanism only need possess common unidirectional power supply, high-precision negative and positive dual power need not be provided, and the absolute value of working power and the supply voltage of extraneous circuit-under-test are without any relation, and the voltage measurement scope also is not limited by operating voltage.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Wherein, 1 is the sample circuit part of input voltage; 2 is the voltage follower circuit part; 3 is difference ratio operational amplification circuit part; 4 is anti-phase scale operation amplification circuits.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described further, but protection domain of the present utility model is not limited to this.
As shown in Figure 1, the measurement mechanism of this measurement relative voltage by be used for two measured point voltage transitions become input voltage sample circuit 1 with respect to the current potential of reference voltage, be used to cushion with isolate before late-class circuit and voltage is remained unchanged voltage follower circuit 2 that input impedance improves, amplify measured point voltage as the input stage of integrated computing and intergrade and bring the difference ratio operational amplification circuit 3 of influence circuit and the prime voltage transitions is become anti-phase scale operation amplifying circuit 4 form by the variation of external condition with respect to the voltage difference of reference voltage in order to inhibition.
Input voltage sample circuit 1 and voltage follower circuit 2 are connected by front stage circuits being inserted amplifier anode.As shown in Figure 1, voltage follower circuit comprises amplifier IC1A and amplifier IC1B, and wherein, IC1A is a prime forward operation amplifier, and IC1D is a prime negative sense operational amplifier, two amplifiers and connect use as voltage follower to improve input impedance.Voltage follower circuit 2 is connected respectively with input resistance R4, the R6 of difference ratio operational amplification circuit by the amplifier out with prime with difference ratio operational amplification circuit 3 does connection.Difference ratio operational amplification circuit 3 is made up of resistance R 4, R8, R6, R9 and amplifier IC1B, wherein, and R4=R6, R8=R9.The voltage (U12) that amplifies M times of back output through the work of above-mentioned voltage follower circuit 2 and difference ratio operational amplification circuit 3 is
Difference ratio operational amplification circuit 3 is connected with the resistance R 10 of back level by the pre-amplifier output terminal with anti-phase scale operation amplifying circuit 4 to be connected.Anti-phase scale operation amplifying circuit 4 comprises resistance R 5, R10, R11 and amplifier IC1C.Drawing final output voltage with respect to reference voltage 2.5V after anti-phase scale operation amplifies certain multiple is that k * (U1-U2), wherein k is a constant coefficient.
Output voltage is through drawing in the actual measurement circuit 2 relative voltage after the A/D conversion.The employed operational amplifier of the utility model can adopt any existing integrated operational amplifier circuit according to demand, and each parameter in the circuit can be adjusted according to demand flexibly.
Claims (5)
1. measurement mechanism of measuring relative voltage is characterized in that: comprise in the described measurement mechanism: the input voltage sample circuit is used for two measured point voltage transitions are become current potential with respect to reference voltage; Voltage follower circuit, be used to cushion with isolate before the input impedance that remains unchanged of late-class circuit and voltage that sample circuit is obtained improve; Difference ratio operational amplification circuit amplifies through the voltage behind the voltage follower circuit as the input stage and the intergrade of integrated computing; Anti-phase scale operation amplifying circuit will become the voltage difference with respect to reference voltage through the voltage transitions of differential ratio column operations amplifying circuit.
2. the input voltage sample circuit in the measurement mechanism of measurement relative voltage according to claim 1, it is characterized in that: described input voltage sample circuit is made up of positive input and the negative input voltage circuit with respect to reference voltage resistance R 1, resistance R 3 and resistance R 2, resistance R 7, wherein, R1=R2, R3=R7.
3. the voltage follower circuit in the measurement mechanism of measurement relative voltage according to claim 1 is characterized in that: described voltage follower circuit is finished by prime forward operation amplifier and prime negative sense operational amplifier co-operation.
4. the difference ratio operational amplification circuit in the measurement mechanism of measurement relative voltage according to claim 1, it is characterized in that: described difference ratio operational amplification circuit is made up of resistance R 4, R8, R6, R9 and operational amplifier, wherein, R4=R6, R8=R9.
5. the anti-phase scale operation amplifying circuit in the measurement mechanism of measurement relative voltage according to claim 1 is characterized in that: described anti-phase scale operation amplifying circuit is made up of resistance R 5, R10, R11 and operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201791290U CN201654110U (en) | 2010-04-30 | 2010-04-30 | Device for measuring relative voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201791290U CN201654110U (en) | 2010-04-30 | 2010-04-30 | Device for measuring relative voltage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201654110U true CN201654110U (en) | 2010-11-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201791290U Expired - Lifetime CN201654110U (en) | 2010-04-30 | 2010-04-30 | Device for measuring relative voltage |
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| CN (1) | CN201654110U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103149417A (en) * | 2013-01-30 | 2013-06-12 | 北京信诺达泰思特科技股份有限公司 | Circuit measuring module and method for measuring voltage difference of power source device |
| CN104166034A (en) * | 2014-08-12 | 2014-11-26 | 成都信息工程学院 | High-precision difference sampling circuit |
| CN105490290A (en) * | 2016-01-27 | 2016-04-13 | 国网浙江嘉善县供电公司 | Static reactive power compensator |
| CN105866190A (en) * | 2016-05-27 | 2016-08-17 | 南京信息工程大学 | Electronic nose device for food detection and detection method |
| CN106549641A (en) * | 2015-09-16 | 2017-03-29 | 中兴通讯股份有限公司 | A kind of protection circuit |
| CN109459600A (en) * | 2018-12-25 | 2019-03-12 | 北京华峰测控技术股份有限公司 | A kind of floating wide-range voltage measuring circuit |
| CN110530253A (en) * | 2019-08-30 | 2019-12-03 | 西安电子科技大学 | Optimum design method for resistance-type wireless and passive strain transducer measuring circuit |
-
2010
- 2010-04-30 CN CN2010201791290U patent/CN201654110U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103149417A (en) * | 2013-01-30 | 2013-06-12 | 北京信诺达泰思特科技股份有限公司 | Circuit measuring module and method for measuring voltage difference of power source device |
| CN104166034A (en) * | 2014-08-12 | 2014-11-26 | 成都信息工程学院 | High-precision difference sampling circuit |
| CN106549641A (en) * | 2015-09-16 | 2017-03-29 | 中兴通讯股份有限公司 | A kind of protection circuit |
| CN106549641B (en) * | 2015-09-16 | 2021-07-06 | 中兴通讯股份有限公司 | Protective circuit |
| CN105490290A (en) * | 2016-01-27 | 2016-04-13 | 国网浙江嘉善县供电公司 | Static reactive power compensator |
| CN105866190A (en) * | 2016-05-27 | 2016-08-17 | 南京信息工程大学 | Electronic nose device for food detection and detection method |
| CN109459600A (en) * | 2018-12-25 | 2019-03-12 | 北京华峰测控技术股份有限公司 | A kind of floating wide-range voltage measuring circuit |
| CN109459600B (en) * | 2018-12-25 | 2024-04-30 | 北京华峰测控技术股份有限公司 | Floating wide-range voltage measurement circuit |
| CN110530253A (en) * | 2019-08-30 | 2019-12-03 | 西安电子科技大学 | Optimum design method for resistance-type wireless and passive strain transducer measuring circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20101124 |
|
| CX01 | Expiry of patent term |