CN207623401U - A kind of negative voltage AD sample circuits - Google Patents
A kind of negative voltage AD sample circuits Download PDFInfo
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- CN207623401U CN207623401U CN201721351030.2U CN201721351030U CN207623401U CN 207623401 U CN207623401 U CN 207623401U CN 201721351030 U CN201721351030 U CN 201721351030U CN 207623401 U CN207623401 U CN 207623401U
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Abstract
The utility model discloses a kind of negative voltage AD sample circuits, including bleeder circuit, esd protection circuit, resistance capacitance integrating circuit and AD sampling A/D chips；The bleeder circuit includes first resistor, second resistance, the first diode and the second diode, the first resistor and second resistance are series between sample port and reference voltage source VREF, first diode is in parallel with first resistor, negative pole end is connect with VREF, second diode cathode end is connect with the first diode, positive terminal ground connection；Described esd protection circuit one end is connected to the tie point of first resistor and second resistance, one end ground connection；Resistance capacitance integrating circuit one end is connected to the tie point of first resistor and second resistance, one end ground connection；The AD sampling A/D chips are connect with resistance capacitance integrating circuit.The circuit does not use operational amplifier, does not have to dual power supply, you can realizes and is sampled to the AD of negative voltage.
Description
Technical field
The utility model is related to voltage sample technical field more particularly to a kind of negative voltage AD sample circuits.
Background technology
When designing circuit, when being related to positive-negative power power supply, it usually needs AD samplings are carried out to negative voltage, to monitor
Whether negative voltage is normal, and this demand is not generally high to voltage sample required precision, and rate request is not also high, but needs circuit
Simply, at low cost, it is reliable and stable.
If to carry out AD samplings to negative voltage, it is necessary first to which it is positive voltage to overturn negative voltage, then carries out resistance point
Pressure and measurement generally build interlock circuit using operational amplifier in common design and carry out negative voltage overturning, in some cases
It is amplifier power supply to also need to individually generate positive-negative power all the way, same although this can solve the AD Samplings to negative voltage
When also power consumption is caused to increase, circuit is more complicated, and cost is too high, and stability is poor, and the amplifier newly increased can also introduce it is certain
Noise causes harmful effect to circuit, it is therefore desirable to design a kind of inexpensive, simple and reliable negative voltage AD sample circuits.
Utility model content
In order to solve the deficiencies in the prior art, the utility model provides a kind of negative voltage AD sample circuits, the circuit knot
Structure is simple, and stability is high, highly practical, low cost, and can guarantee the application demand of circuit voltage sampling.
To achieve the goals above, the technical solution of the utility model is as follows：
A kind of negative voltage AD sample circuits, including bleeder circuit, esd protection circuit, resistance capacitance integrating circuit and AD are adopted
Sample chip；The bleeder circuit includes first resistor, second resistance, the first diode and the second diode, the first resistor
It is series between detection port and reference voltage source VREF with second resistance, first diode is in parallel with first resistor, bears
It is extremely connect with VREF, second diode cathode end is connect with the first diode, positive terminal ground connection；The ESD protections electricity
Road one end is connected to the tie point of first resistor and second resistance, one end ground connection；Resistance capacitance integrating circuit one end connects
In the tie point of first resistor and second resistance, one end ground connection；The AD sampling A/D chips are connect with resistance capacitance integrating circuit.
Further, the esd protection circuit includes bi-directional ESD protection diode and the first capacitance.
Further, bi-directional ESD protection diode one end is grounded, and one end and is connected to first resistor and second resistance
Tie point, first capacitance is in parallel with bi-directional ESD protection diode.
Further, the resistance capacitance integrating circuit includes the 3rd resistor being arranged in series and the second capacitance.
Further, one end of the 3rd resistor is connected to the tie point of first resistor and second resistance, and described second
One end of capacitance is grounded.
Further, the AD sampling A/D chips are connected to the tie point of 3rd resistor and the second capacitance.
Further, the tie point of the first resistor and second resistance is voltage sample point.
Further, the first resistor and second resistance are precision resister, and precision is 1% or more.
Further, the model BAT54S of first diode and the second diode.
Further, the model VCUT03B1-DD1 of the bi-directional ESD protection diode.
Compared with prior art, the utility model has the beneficial effects that：
(1) sample circuit of the utility model does not use operational amplifier, does not have to dual power supply, you can realizes to negative electricity
The AD of pressure is sampled；
(2) circuit of the utility model is extremely simple, and stability is high, highly practical, low cost, and can guarantee circuit voltage
Sample application demand.
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 exemplary circuit figure of the utility model negative voltage AD sample circuits.
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 provide further instruction to the application.Unless another
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, exist in the prior art that negative voltage AD sample circuit power consumptions are big, and circuit is complicated, at
This height, the problem of stability difference, in order to solve technical problem as above, present applicant proposes a kind of negative voltage AD sample circuits,
The circuit structure is simple, and stability is high, highly practical, low cost, and can guarantee the application demand of circuit voltage sampling.
As shown in Figure 1, a kind of negative voltage AD sample circuits, including bleeder circuit, esd protection circuit, resistance capacitance integral
Circuit and AD sampling A/D chips；The bleeder circuit includes first resistor R1, second resistance R2, the first diode D1 and the two or two pole
Pipe D2, the first resistor R1 and second resistance R2 are series between voltage to be measured and reference voltage V REF, the one or two pole
Pipe D1 is in parallel with first resistor R1, and negative pole end is connect with VREF, and the second diode D2 negative pole ends and the first diode D1 connect
It connects, positive terminal ground connection；Described esd protection circuit one end is connected to the tie point of first resistor R1 and second resistance R2, a termination
Ground；Resistance capacitance integrating circuit one end is connected to the tie point of first resistor R1 and second resistance R2, one end ground connection；It is described
AD sampling A/D chips are connect with resistance capacitance integrating circuit.
The esd protection circuit includes bi-directional ESD protection diode EPD1 and the first capacitance C1, the bi-directional ESD protection
The one end diode EPD1 is grounded, one end and the tie point for being connected to first resistor R1 and second resistance R2, the first capacitance C1
It is in parallel with bi-directional ESD protection diode EPD1.
The resistance capacitance integrating circuit includes the 3rd resistor R3 being arranged in series and the second capacitance C2, the 3rd resistor
One end of R3 is connected to the tie point of first resistor R1 and second resistance R2, one end ground connection of the second capacitance C2.
The AD sampling A/D chips are connected to the tie point of 3rd resistor R3 and the second capacitance C2.
The tie point of the first resistor R1 and second resistance R2 is voltage sample point.
The first resistor R1 and second resistance R2 is precision resister, and precision is 1% or more.
The model BAT54S of the first diode D1 and the second diode D2.
The model VCUT03B1-DD1 of the bi-directional ESD protection diode EDP1.
Sample port access circuit voltage end to be measured.
The negative voltage measuring process of the utility model is as follows：
Step 1) determines voltage range to be measured, it is contemplated that scope range of the fluctuation of voltage and Redundancy Design set measured target voltage
It is set to：0~-24V；
Step 2) determines voltage sample point, and the tie point voltage of first resistor R1 and second resistance R2 is the electricity based on AGND
Pressure is the voltage sample point of AD, and abbreviation sampled point, normal variation range is 0~VREF；As shown in Figure 1, first resistor R1 and
The configuration of two resistance R2 so that voltage to be measured changes in the ranges of -24.15V~0 when sample amplitude when reproduced is 0~2.5V；
Step 3) configures the resistance value of first resistor R1 and second resistance R2 so as to be measured when sample amplitude when reproduced is equal to 0
Voltage is less than -24V；
Step 4) voltage sample, after first resistor R1 is determined with second resistance R2 parameters, sample amplitude when reproduced is by level-one electricity
After hindering capacitance integral circuit, voltage sample is carried out into AD sampling A/D chips.
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. a kind of negative voltage AD sample circuits, it is characterised in that：Including bleeder circuit, esd protection circuit, resistance capacitance integral electricity
Road and AD sampling A/D chips；The bleeder circuit includes first resistor, second resistance, the first diode and the second diode, described
First resistor and second resistance are series between sample port and reference voltage source VREF, first diode and first resistor
Parallel connection, negative pole end are connect with VREF, and second diode cathode end is connect with the first diode, positive terminal ground connection；The ESD
Protection circuit on one side is connected to the tie point of first resistor and second resistance, one end ground connection；The resistance capacitance integrating circuit one
End is connected to the tie point of first resistor and second resistance, one end ground connection；The AD sampling A/D chips and resistance capacitance integrating circuit
Connection.
2. a kind of negative voltage AD sample circuits as described in claim 1, which is characterized in that the esd protection circuit includes double
To ESD protection diodes and the first capacitance.
3. a kind of negative voltage AD sample circuits as claimed in claim 2, which is characterized in that the bi-directional ESD protection diode
One end is grounded, and one end and the tie point for being connected to first resistor and second resistance, first capacitance protect two poles with bi-directional ESD
Pipe is in parallel.
4. a kind of negative voltage AD sample circuits as described in claim 1, which is characterized in that the resistance capacitance integrating circuit packet
Include the 3rd resistor being arranged in series and the second capacitance.
5. a kind of negative voltage AD sample circuits as claimed in claim 4, which is characterized in that one end of the 3rd resistor connects
It is grounded in one end of the tie point of first resistor and second resistance, second capacitance.
6. a kind of negative voltage AD sample circuits as described in claim 1, which is characterized in that the AD sampling A/D chips are connected to the
The tie point of three resistance and the second capacitance.
7. a kind of negative voltage AD sample circuits as described in claim 1 are it is characterized in that, the first resistor and second resistance
Tie point be voltage sample point.
8. a kind of negative voltage AD sample circuits as described in claim 1, which is characterized in that the first resistor and second resistance
For precision resister, precision is 1% or more.
9. a kind of negative voltage AD sample circuits as described in claim 1, which is characterized in that first diode and the two or two
The model BAT54S of pole pipe.
10. a kind of negative voltage AD sample circuits as claimed in claim 2, which is characterized in that the bi-directional ESD protection diode
Model VCUT03B1-DD1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721351030.2U CN207623401U (en) | 2017-10-19 | 2017-10-19 | A kind of negative voltage AD sample circuits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721351030.2U CN207623401U (en) | 2017-10-19 | 2017-10-19 | A kind of negative voltage AD sample circuits |
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| Publication Number | Publication Date |
|---|---|
| CN207623401U true CN207623401U (en) | 2018-07-17 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721351030.2U Active CN207623401U (en) | 2017-10-19 | 2017-10-19 | A kind of negative voltage AD sample circuits |
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| CN (1) | CN207623401U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109347481A (en) * | 2018-09-17 | 2019-02-15 | 南京中感微电子有限公司 | A kind of continuous time plural number band logical sigma-delta analog-digital converter and Bluetooth RF transceiver |
| CN110912105A (en) * | 2019-10-25 | 2020-03-24 | 芜湖宏景电子股份有限公司 | High-low voltage protection circuit for power supply voltage range detection |
-
2017
- 2017-10-19 CN CN201721351030.2U patent/CN207623401U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109347481A (en) * | 2018-09-17 | 2019-02-15 | 南京中感微电子有限公司 | A kind of continuous time plural number band logical sigma-delta analog-digital converter and Bluetooth RF transceiver |
| CN110912105A (en) * | 2019-10-25 | 2020-03-24 | 芜湖宏景电子股份有限公司 | High-low voltage protection circuit for power supply voltage range detection |
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Address after: 250101 A203, block F, entrepreneurship square, Qilu Software Park, No.1 Shunhua Road, high tech Development Zone, Jinan City, Shandong Province 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. |