CN207623403U - A kind of exchange low current signal sampling and modulate circuit - Google Patents
A kind of exchange low current signal sampling and modulate circuit Download PDFInfo
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- CN207623403U CN207623403U CN201721584368.2U CN201721584368U CN207623403U CN 207623403 U CN207623403 U CN 207623403U CN 201721584368 U CN201721584368 U CN 201721584368U CN 207623403 U CN207623403 U CN 207623403U
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- low current
- modulate circuit
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Abstract
The utility model discloses a kind of sampling of exchange low current signal and modulate circuits, including sampling isolation module and sampled signal conditioning module；The sampling isolation module includes sampling resistor R1 and isolating transformer T1, the sampling resistor R1 and current-series to be measured, and the isolating transformer T1 is in parallel with sampling resistor R1；The sampled signal conditioning module, including instrument amplifier U1, signal gain amplifier resistance R2 and signal condition resistance R3 and R4, the instrument amplifier U1 is in parallel with isolating transformer T1, the signal gain amplifier resistance R2 is the outer connecting resistance of instrument amplifier U1, and signal condition the resistance R3 and R4 are connected with two signal input ports of instrument amplifier U1 respectively.The circuit structure is simple, and stability is high, and highly practical and sampling distortion is small.
Description
Technical field
The utility model is related to signal sampling and conditioning technology field more particularly to a kind of exchange low current signal sampling and
Amplitude modulate circuit.
Background technology
It is varied to the sampling and Opsonizing method of current signal in circuit design, it can according to the size of electric current to be measured
It is divided into high current and low current, DC current and alternating current can be divided into according to measurement demand, each type of electric current has not
Same sampling and signal condition method.
High current sampling generally uses current transformer and auxiliary circuit to realize sampling and signal condition to high current, directly
Stream, low current sampling generally only need one sampling resistor of series connection can be realized, but smaller ac current signal are adopted
Sample often makes sampled signal be interfered by direct current signal, leads to nothing using the mode that series connection sampling resistor is directly sampled
The accurate Measuring Alternating Current Signal size of method.In addition, to be directly connected to easily lead to ADC chips impaired for current side to be measured and ADC chips,
And lack necessary signal conditioning circuit, the measurement range of electric current can be caused to be restricted, current measurement precision is directly sampled
The influence of resistance precision, it is poor with the compatibility of other circuits.Therefore need to design a kind of low cost, be suitable for exchanging small electricity
The sampling of stream and modulate circuit.
Utility model content
In order to solve the deficiencies in the prior art, the utility model provides a kind of exchange low current signal sampling and conditioning electricity
Road, the circuit realize current side to be measured and sample the signal isolation of side, and circuit safety is high, in addition signal conditioning circuit guarantee
The circuit compatibility is good, can meet the input driving demand of a variety of ADC chips, and the input dynamic range of current signal to be measured
It is wider.
To achieve the goals above, the technical solution of the utility model is as follows：
It is a kind of exchange low current signal sampling and modulate circuit, including sampling isolation module and sampled signal improve mould
Block；The sampling isolation module includes sampling resistor R1 and isolating transformer T1, the sampling resistor R1 and current-series to be measured,
The isolating transformer T1 is in parallel with sampling resistor R1；
The sampled signal conditioning module, including instrument amplifier U1, signal gain amplifier resistance R2 and signal condition
Resistance R3 and R4, the instrument amplifier U1 is in parallel with isolating transformer T1, and the signal gain amplifier resistance R2 is put for instrument
The outer connecting resistance of big device U1, signal condition the resistance R3 and R4 respectively with two signal input port phases of instrument amplifier U1
Even.
Further, the other end ground connection of the sampling resistor R1.
Further, the sampled signal conditioning module further includes externally input conditioned signal.
Further, the externally input conditioned signal includes the conditioning voltage VCM of three inputs.
Further, the other end of signal condition the resistance R3 and R4 are connected with two of which conditioning voltage VCM respectively.
Further, one of described conditioning voltage VCM is directly connected with instrument amplifier U1.
Further, the supply voltage V+ and V- of the instrument amplifier U1 is single supply or negative and positive dual power.
Further, the resistance R1~R4 is the Low Drift Temperature resistance of 1% or more sampling precision.
Further, the model LM-LP-1001L of the isolating transformer T1.
Further, the model AD8220ARMZ of the instrument amplifier U1.
Compared with prior art, the utility model has the beneficial effects that：
(1) the utility model by be arranged isolating transformer realize signal sample circuit and signal conditioning circuit every
From, it is ensured that the circuit safety of signal condition side；Meanwhile isolating transformer isolated DC signal, thoroughly avoid direct current signal
Influence to measurement result improves measurement sampling essence to realize low distortion, the sampling with high precision to exchanging low current
Degree；
(2) Signal-regulated kinase of the utility model, which can be realized, zooms in or out sampled signal and the lift of voltage
It rises and reduces, adapt it to the input dynamic range requirement of more kinds of ADC acquisition chips, meanwhile, signal is zoomed in or out
Wider current measuring range can be achieved；
(3) the utility model circuit structure is simple, and stability is good, highly practical.
Description of the drawings
The accompanying drawings which form a part of this application are used for providing further understanding of the present application, and the application's shows
Meaning property embodiment and its explanation do not constitute the improper restriction to the application for explaining the application.
Fig. 1 is the circuit structure diagram of the utility model.
Specific implementation mode
The utility model is described further with specific embodiment below in conjunction with the accompanying drawings.
It is noted that following detailed description is all illustrative, it is intended to further instruction is provided to the application, unless separately
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific implementation mode, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative
It is also intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or combination thereof.
In the present invention, term for example "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal",
The orientation or positional relationship of the instructions such as " side ", "bottom" is to be based on the orientation or positional relationship shown in the drawings, only to facilitate chatting
The relative for stating each component of the utility model or component structure relationship and determination, not refer in particular in the utility model either component or
Element should not be understood as limiting the present invention.
In the utility model, term such as " affixed ", " connected ", " connection " shall be understood in a broad sense, and expression can be fixed
Connection, can also be to be integrally connected or be detachably connected；It can be directly connected, the indirect phase of intermediary can also be passed through
Even.Related scientific research for this field or technical staff can determine above-mentioned term in the present invention as the case may be
Concrete meaning, should not be understood as limiting the present invention.
As background technology is introduced, the signal sampling that small alternating current exists in the prior art easily is done by direct current signal
It disturbs, leads to not accurate Measuring Alternating Current Signal size and current side to be measured and be directly connected to easily lead to ADC cores with ADC chips
Piece is impaired, and the problem of lack necessary signal conditioning circuit, and in order to solve technical problem as above, present applicant proposes one kind
Low current signal sampling and modulate circuit are exchanged, the signal isolation of circuit current side to be measured and sampling side, circuit safety is high,
In addition signal conditioning circuit has ensured that the circuit compatibility is good, can meet the input driving demand of a variety of ADC chips, and electricity to be measured
The input dynamic range for flowing signal is wider.
As shown in Figure 1, sampling and the modulate circuit of a kind of exchange low current signal, including sampling isolation module and sampling are believed
Number conditioning module；The sampling isolation module include sampling resistor R1 and isolating transformer T1, the sampling resistor R1 with it is to be measured
Current-series, the isolating transformer T1 are in parallel with sampling resistor R1；
The sampled signal conditioning module, including instrument amplifier U1, signal gain amplifier resistance R2 and signal condition
Resistance R3 and R4, the instrument amplifier U1 is in parallel with isolating transformer T1, and the signal gain amplifier resistance R2 is put for instrument
The outer connecting resistance of big device U1, signal condition the resistance R3 and R4 respectively with two signal input port phases of instrument amplifier U1
Even.
The other end of the sampling resistor R1 is grounded.
The sampled signal conditioning module further includes externally input conditioned signal, the externally input conditioned signal packet
The conditioning voltage VCM of three inputs is included, one of described conditioning voltage VCM is directly connected with instrument amplifier U1, described
Other two of conditioning voltage VCM is connected with signal condition resistance R3 and R4 respectively.
The conditioning voltage VCM is mainly responsible for the horizontal voltage lifting of sampled signal or declines.
The supply voltage V+ and V- of the instrument amplifier U1 is single supply or negative and positive dual power.
Resistance R1~the R4 is the Low Drift Temperature resistance of 1% or more sampling precision.
The preferred model LM-LP-1001L of the isolating transformer T1.
The preferred model AD8220ARMZ of the instrument amplifier U1.
The sampling of the exchange low current signal of the utility model and modulate circuit, realize the sampling to current signal to be measured
It is isolated with low distortion and exports.Signal sampling and signal conditioning circuit are isolated by isolating transformer T1 for the circuit, it is ensured that
The circuit safety of signal condition side；Meanwhile isolating transformer T1 isolated DC signals, direct current signal is thoroughly avoided to measuring
As a result influence, improves measurement accuracy.
In addition, the power supply power supply range of circuit device amplifier U1 is wide, the dynamic range of conditioned signal output has been ensured,
The driving demand of more ADC chips can be met.
The foregoing is merely the preferred embodiments of the application, are not intended to limit this application, for the skill of this field
For art personnel, the application can have various modifications and variations.Within the spirit and principles of this application, any made by repair
Change, equivalent replacement, improvement etc., should be included within the protection domain of the application.
It is above-mentioned although specific embodiments of the present invention are described with reference to the accompanying drawings, but not to this practicality newly
The limitation of type protection domain, those skilled in the art should understand that, based on the technical solution of the present invention, ability
Field technique personnel need not make the creative labor the various modifications or changes that can be made still in the protection model of the utility model
Within enclosing.
Claims (10)
1. sampling and the modulate circuit of a kind of exchange low current signal, it is characterised in that：Believe including sampling isolation module and sampling
Number conditioning module；The sampling isolation module include sampling resistor R1 and isolating transformer T1, the sampling resistor R1 with it is to be measured
Current-series, the isolating transformer T1 are in parallel with sampling resistor R1；
The sampled signal conditioning module, including instrument amplifier U1, signal gain amplifier resistance R2 and signal condition resistance
R3 and R4, the instrument amplifier U1 is in parallel with isolating transformer T1, and the signal gain amplifier resistance R2 is instrument amplifier
The outer connecting resistance of U1, signal condition the resistance R3 and R4 are connected with two signal input ports of instrument amplifier U1 respectively.
2. sampling and the modulate circuit of a kind of exchange low current signal as described in claim 1, which is characterized in that the sampling
The other end of resistance R1 is grounded.
3. sampling and the modulate circuit of a kind of exchange low current signal as described in claim 1, which is characterized in that the sampling
Signal-regulated kinase further includes externally input conditioned signal.
4. sampling and the modulate circuit of a kind of exchange low current signal as claimed in claim 3, which is characterized in that the outside
The conditioned signal of input includes the conditioning voltage VCM of three inputs.
5. sampling and the modulate circuit of a kind of exchange low current signal as described in claim 1 or 4, which is characterized in that described
The two of which of conditioning voltage VCM is connected with signal condition the resistance R3 and R4 respectively.
6. sampling and the modulate circuit of a kind of exchange low current signal as claimed in claim 4, which is characterized in that the conditioning
One of voltage VCM is directly connected with instrument amplifier U1.
7. sampling and the modulate circuit of a kind of exchange low current signal as described in claim 1, which is characterized in that the instrument
The supply voltage V+ and V- of amplifier U1 is single supply or negative and positive dual power.
8. sampling and the modulate circuit of a kind of exchange low current signal as described in claim 1, which is characterized in that the resistance
R1~R4 is the Low Drift Temperature resistance of 1% or more sampling precision.
9. sampling and the modulate circuit of a kind of exchange low current signal as described in claim 1, which is characterized in that the isolation
The model LM-LP-1001L of transformer T1.
10. sampling and the modulate circuit of a kind of exchange low current signal as described in claim 1, which is characterized in that the instrument
The model AD8220ARMZ of table amplifier U1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721584368.2U CN207623403U (en) | 2017-11-23 | 2017-11-23 | A kind of exchange low current signal sampling and modulate circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721584368.2U CN207623403U (en) | 2017-11-23 | 2017-11-23 | A kind of exchange low current signal sampling and modulate circuit |
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| Publication Number | Publication Date |
|---|---|
| CN207623403U true CN207623403U (en) | 2018-07-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721584368.2U Active CN207623403U (en) | 2017-11-23 | 2017-11-23 | A kind of exchange low current signal sampling and modulate circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109541513A (en) * | 2018-12-25 | 2019-03-29 | 北京东方计量测试研究所 | A kind of exchange micro-current is traced to the source device and method |
-
2017
- 2017-11-23 CN CN201721584368.2U patent/CN207623403U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109541513A (en) * | 2018-12-25 | 2019-03-29 | 北京东方计量测试研究所 | A kind of exchange micro-current is traced to the source device and method |
| CN109541513B (en) * | 2018-12-25 | 2022-02-08 | 北京东方计量测试研究所 | Alternating current micro-current tracing device and method |
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Address after: 250101 Qilu Software Park, No. 1 Shunhua Road, Jinan High-tech Development Zone, Shandong Province, A 203 Patentee after: Conway Communication Technology Co., Ltd Address before: 250101 Qilu Software Park, No. 1 Shunhua Road, Jinan High-tech Development Zone, Shandong Province, A 203 Patentee before: SHANDONG KANGWEI COMMUNICATION TECHNOLOGY Co.,Ltd. |