CN209731191U - A kind of High accuracy voltage follower of wide input voltage - Google Patents
A kind of High accuracy voltage follower of wide input voltage Download PDFInfo
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- CN209731191U CN209731191U CN201920741590.1U CN201920741590U CN209731191U CN 209731191 U CN209731191 U CN 209731191U CN 201920741590 U CN201920741590 U CN 201920741590U CN 209731191 U CN209731191 U CN 209731191U
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Abstract
The utility model discloses a kind of High accuracy voltage followers of wide input voltage, it includes high voltage bearing NMOS tube M10 and M11, operational amplification circuit, clamp circuit and constant-current source, the NMOS tube M10 is that the output stage of voltage follower connects voltage output end, NMOS tube M11 is that the input stage of voltage follower connects voltage input end, the operational amplification circuit is the standard operational amplifier circuit being made of multiple low-voltage devices, the operational amplifier circuit is separately connected voltage input end, high-voltage end and floating ground terminal, and maximum differential pressure is clamped down on by the clamp circuit between its both ends, the constant-current source provides constant electric current for circuit, it includes constant-current source I1, constant-current source I2 and constant-current source I3, constant-current source I1 is arranged in floating ground terminal, constant-current source I2 is arranged in high-voltage end, constant-current source I3 is arranged defeated Outlet.The utility model low cost, realizes high-precision, and the voltage sample of wide scope follows universal circuit, can be widely applied to high pressure wide-range voltage follower field.
Description
Technical field
The utility model relates to a kind of High accuracy voltage followers of wide input voltage, belong to microelectronics technology.
Background technique
It under high voltage input condition, for example is 6 to 40 in supply voltage in new-energy automobile and other industrial circles
Volt will realize that the voltage very wide to an input range carries out high-precision tracking and be input to inside circuit to facilitate subsequent place
Reason needs the high-precision sampling input for realizing high voltage especially in battery management system (BMS), and due to new energy
The battery of automobile is connected in series by multiple batteries, and the voltage of series-connected cell can make the electricity for needing to check according to the difference of joint number
It is pressed with very big variation range.Therefore, the voltage follower of high precision wide range just becomes required.
Since the general gate source voltage of MOS device (Vgs) in existing integrated circuit is just in 5V or hereinafter, when input electricity
When pressure is greater than 5V, common voltage follower (buffer) circuit being made of operational amplifier cannot be met the requirements
.In order to realize the detection to high pressure, it is low-voltage appropriate that resistance string voltage division processing can also be carried out to detected high pressure, into
And handled with the voltage follower that the device of low pressure is constituted, but use divider resistance, not only influence follower precision, Er Qiehui
Make to be lost extracurrent by sample circuit, change by the loading condition of sampled voltage, to influence voltage sample precision.
Summary of the invention
The purpose of this utility model is to provide a kind of high tension voltage of achievable wide-range high-accuracy sampling voltage with
With device.
To achieve the above object, the technical solution that the utility model is taken is as follows:
A kind of High accuracy voltage follower of wide input voltage comprising high voltage bearing NMOS tube M10, high voltage bearing NMOS
Pipe M11, operational amplification circuit, clamp circuit and constant-current source, the NMOS tube M10 are that the output stage of voltage follower connects voltage
Output end, NMOS tube M11 are that the input stage of voltage follower connects voltage input end, and the operational amplification circuit is by multiple low
The standard operational amplifier circuit that voltage device is constituted, the operational amplifier circuit are separately connected voltage input end, high-voltage end and floating ground terminal, and its both ends
Between maximum differential pressure clamped down on by the clamp circuit, the constant-current source provides constant electric current for circuit comprising constant current
Source I1, constant-current source I2 and constant-current source I3, in floating ground terminal, constant-current source I2 is arranged in high-voltage end, constant-current source for the constant-current source I1 setting
I3 is arranged in output end.
Further, the operational amplification circuit is made of low pressure field-effect tube M1, M2, M3, M4, M5, M9 and M12
Standard operational amplifier circuit, wherein field-effect tube M1, M2, M5 and M9 is PMOS tube, and field-effect tube M3, M4 and M12 are NMOS tube；PMOS
Pipe M5 connects high-voltage end VB by constant-current source I2 with the source electrode of M9, and the source electrode of NMOS tube M3, M4 and M12 are separately connected floating ground terminal
Vlow and constant-current source I1.
Further, the input terminal of the constant-current source I1 connects floating ground terminal Vlow, output end ground connection；The constant-current source I2's
Input terminal connects high-voltage end VB, output end connection；The source electrode of the input terminal connection NMOS tube M10 of the constant-current source I3, output end
Ground connection.
Further, the constant-current source I1 is 60uA, and constant-current source I2 is 40uA, and constant-current source I3 is 10uA.
Further, the grid of the grid of the grid connection PMOS tube M5 of the PMOS tube M9, drain electrode connection NMOS tube M10
And the drain electrode of NMOS tube M12, the source electrode of drain electrode connection the PMOS tube M1 and M2 of the PMOS tube M5, the leakage of PMOS tube M1 and M2
Pole is separately connected NMOS tube M3 and M4 drain electrode, and the grid of PMOS tube M1 connects voltage input end, the grid connection of PMOS tube M2
Voltage output end.
Further, the clamp circuit forms by way of being connected by NMOS tube M6, M7 and M8 grid drain electrode, and
The source of NMOS tube M6 and the source of NMOS tube M8 are connected to the input terminal of constant-current source I1 and the output end of constant-current source I2.
Further, described PMOS tube M1, M2, M5, M8 and M9 be 3.3V PMOS device, the NMOS tube M3, M4,
M6, M7 and M12 are the NMOS device of 3.3V.
Further, the maximum voltage between the floating power supply end Vhigh at the clamp circuit both ends and floating ground terminal Vlow
Difference is no more than 3.3V.
Further, the drain electrode of the NMOS tube M10 connects high-voltage end VB, and source electrode connects voltage output end and constant-current source I3
Input terminal.
Further, the grid of the NMOS tube M11 connects voltage input end, and source electrode connects floating ground terminal Vlow, and drain electrode connects
Meet high-voltage end VB.
Compared with prior art, the utility model following the utility model has the advantages that
The utility model is adopted using the high tension voltage that low pressure conventional MOS device (3.3V device) realizes wide-range high-accuracy
Sample solves all using high pressure particular device bring cost and loss of significance.And it does not need to punish from by sampled voltage
Galvanic electricity stream solves the deficiency sampled with resistance partial-pressure structure, and provides the wide more voltages of specific resistance partial-pressure structure and adopt
Sample follows range.
The utility model low cost, realizes high-precision, and the voltage sample of wide scope follows universal circuit, can be extensive
Applied to high pressure wide-range voltage follower field.Such as in new energy car battery management system (BMS), by the present invention
The sampling of proposition follows the voltage of circuit output, so that it may freely be handled by subsequent conditioning circuit (for example, carrying out at electric resistance partial pressure
Reason), without influencing whether by sampled voltage.
The additional aspect and advantage of the utility model will be set forth in part in the description, partially will be from following description
In become obvious, or recognized by the practice of the utility model.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, before not making the creative labor property
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is the circuit structure diagram of the utility model.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
As shown in Figure 1, a kind of High accuracy voltage follower of wide input voltage comprising high voltage bearing NMOS tube M10, resistance to
NMOS tube M11, operational amplification circuit, clamp circuit and the constant-current source of high pressure, the NMOS tube M10 are the output of voltage follower
Grade connection voltage output end, NMOS tube M11 are that the input stage of voltage follower connects voltage input end, the operational amplification circuit
It is the standard operational amplifier circuit being made of multiple low-voltage devices, which is separately connected voltage input end, high-voltage end and floating ground
End, and maximum differential pressure is clamped down on by the clamp circuit between its both ends, the constant-current source provides constant electric current for circuit,
It includes constant-current source I1, constant-current source I2 and constant-current source I3, and in floating ground terminal, constant-current source I2 is arranged in high pressure for the constant-current source I1 setting
End, constant-current source I3 are arranged in output end.
In the present embodiment, the operational amplification circuit is made of low pressure field-effect tube M1, M2, M3, M4, M5, M9 and M12
Standard operational amplifier circuit, wherein field-effect tube M1, M2, M5 and M9 be PMOS tube, field-effect tube M3, M4 and M12 be NMOS tube；
PMOS tube M5 connects high-voltage end VB by constant-current source I2 with the source electrode of M9, and the source electrode of NMOS tube M3, M4 and M12 are separately connected floating ground
Hold Vlow and constant-current source I1.
In the present embodiment, the constant-current source I1 is 60uA, and constant-current source I2 is 40uA, and constant-current source I3 is 10uA.Constant-current source I1
Input terminal connect floating ground terminal Vlow, output end ground connection；The input terminal of constant-current source I2 connects high-voltage end VB, output end connection；It is permanent
The source electrode of the input terminal connection NMOS tube M10 of stream source I3, output end ground connection.
In the present embodiment, the clamp circuit forms by way of being connected by NMOS tube M6, M7 and M8 grid drain electrode, and
The source of NMOS tube M6 and the source of NMOS tube M8 are connected to the input terminal of constant-current source I1 and the output end of constant-current source I2.Pincers
Maximum voltage difference between the floating power supply end Vhigh and floating ground terminal Vlow at position circuit both ends is no more than 3.3V.
This circuit theory is as follows:
Low-voltage device M1, M2, M3, M4, M5, M9 and M12 constitute typical operational amplification circuit.Wherein M1 and M2 is 3.3V
PMOS device, M5, M8 and M9 are the PMOS device of 3.3V.M3, M4 and M6, M7 and M12 are the NMOS device of 3.3V.
M10 is the NMOS tube of one high drain-source voltage (VDS), and VDS voltage can bear the voltage difference of VB to GND, M10
For the output stage of this voltage follower (buffer).
M11 is the NMOS tube of one high drain-source voltage (VDS), and VDS voltage can bear the voltage difference of VB to GND.
M8, M7, M6 and constant-current source I2 and constant-current source I1 determine the floating power supply (Vhigh) and floating ground of operational amplifier circuit
(Vlow) maximum voltage difference.I1 and I2 constitutes the floating power supply and ground of the operational amplifier circuit, (floating power supply Vhigh between them
It is no more than VGS8+VGS7+VGS6, about 3.3V with the maximum voltage difference of floating ground Vlow).
When input (input) voltage is lower than the sum of VLow voltage and VthM11 (threshold voltage that VthM11 is M11 device)
When, device M11 is not turned on, and since I1=60uA > I2=40uA, constant-current source I1 can make Vlow voltage to ground (GND) current potential
Approach, when I1 electric current is reduced to as I2 electric current, VLow voltage essentially (GND) current potential.Entire amplifier can be just
Normal work.
When input (input) voltage is higher than the sum of VLow voltage and VthM11 (threshold voltage that VthM11 is M11 device)
When, device M11 conducting, when input voltage, which continues growing, makes the sum of IM11 (IM11 is the electric current flowed through in M11) and I2 for I1
(IM11+I2=I1), VLow voltage will follow input voltage to increase and increase, and due to M1, M2, M3, M4, M5 and M9,
M12 constitutes the effect of typical operational amplification circuit, and Vout voltage can accurately follow input (input) voltage.
Even if input voltage is fastly close to VB voltage, entire follower (buffer) still can work.M10 can also be to rear
Continuous circuit provides large driven current density.The circuit in a wide range can accurately track input voltage in a word.
The basic principles and main features and advantage of the utility model have been shown and described above.The ordinary skill of this field
Personnel are not it should be appreciated that above-described embodiment limits the protection scope of the utility model, all use equivalent replacements etc. in any form
Mode technical solution obtained, falls in the protection scope of the utility model.
The parts not involved in the utility model is the same as those in the prior art or can be realized by using the prior art.
Claims (10)
1. a kind of High accuracy voltage follower of wide input voltage, it is characterised in that: including high voltage bearing NMOS tube M10, resistance to height
NMOS tube M11, operational amplification circuit, clamp circuit and the constant-current source of pressure, the NMOS tube M10 are the output stage of voltage follower
Voltage output end is connected, NMOS tube M11 is that the input stage of voltage follower connects voltage input end, and the operational amplification circuit is
The standard operational amplifier circuit being made of multiple low-voltage devices, the operational amplifier circuit are separately connected voltage input end, high-voltage end and floating ground terminal,
And maximum differential pressure is clamped down on by the clamp circuit between its both ends, the constant-current source provides constant electric current for circuit,
Including constant-current source I1, constant-current source I2 and constant-current source I3, in floating ground terminal, constant-current source I2 is arranged in high pressure for the constant-current source I1 setting
End, constant-current source I3 are arranged in output end.
2. a kind of High accuracy voltage follower of wide input voltage according to claim 1, it is characterised in that: the operation
Amplifying circuit is the standard operational amplifier circuit being made of low pressure field-effect tube M1, M2, M3, M4, M5, M9 and M12, wherein field-effect tube
M1, M2, M5 and M9 are PMOS tube, and field-effect tube M3, M4 and M12 are NMOS tube；The source electrode of PMOS tube M5 and M9 pass through constant-current source
I2 connection high-voltage end VB, the source electrode of NMOS tube M3, M4 and M12 are separately connected floating ground terminal Vlow and constant-current source I1.
3. a kind of High accuracy voltage follower of wide input voltage according to claim 2, it is characterised in that: the constant current
The input terminal of source I1 connects floating ground terminal Vlow, output end ground connection；The input terminal of the constant-current source I2 connects high-voltage end VB, output end
Connection；The source electrode of the input terminal connection NMOS tube M10 of the constant-current source I3, output end ground connection.
4. a kind of High accuracy voltage follower of wide input voltage according to claim 1 or 3, it is characterised in that: described
Constant-current source I1 is 60uA, and constant-current source I2 is 40uA, and constant-current source I3 is 10uA.
5. a kind of High accuracy voltage follower of wide input voltage according to claim 2, it is characterised in that: the PMOS
The drain electrode of the grid, the grid and NMOS tube M12 of drain electrode connection NMOS tube M10 of the grid connection PMOS tube M5 of pipe M9, it is described
The source electrode of drain electrode connection the PMOS tube M1 and M2 of PMOS tube M5, the drain electrode of PMOS tube M1 and M2 are separately connected NMOS tube M3 and M4 leakage
Pole, and the grid of PMOS tube M1 connects voltage input end, the grid of PMOS tube M2 connects voltage output end.
6. a kind of High accuracy voltage follower of wide input voltage according to claim 2, it is characterised in that: the clamper
Circuit forms by way of being connected by NMOS tube M6, M7 and M8 grid drain electrode, and the source of NMOS tube M6 and NMOS tube M8
Source is connected to the input terminal of constant-current source I1 and the output end of constant-current source I2.
7. a kind of High accuracy voltage follower of wide input voltage according to claim 6, it is characterised in that: the PMOS
Pipe M1, M2, M5, M8 and M9 are the PMOS device of 3.3V, and described NMOS tube M3, M4, M6, M7 and M12 are the NMOS device of 3.3V.
8. a kind of High accuracy voltage follower of wide input voltage according to claim 6, it is characterised in that: the clamper
Maximum voltage difference between the floating power supply end Vhigh at circuit both ends and floating ground terminal Vlow is no more than 3.3V.
9. a kind of High accuracy voltage follower of wide input voltage according to claim 1, it is characterised in that: the NMOS
The drain electrode of pipe M10 connects high-voltage end VB, and source electrode connects the input terminal of voltage output end and constant-current source I3.
10. a kind of High accuracy voltage follower of wide input voltage according to claim 1, it is characterised in that: described
The grid of NMOS tube M11 connects voltage input end, and source electrode connects floating ground terminal Vlow, drain electrode connection high-voltage end VB.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920741590.1U CN209731191U (en) | 2019-05-22 | 2019-05-22 | A kind of High accuracy voltage follower of wide input voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920741590.1U CN209731191U (en) | 2019-05-22 | 2019-05-22 | A kind of High accuracy voltage follower of wide input voltage |
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| CN209731191U true CN209731191U (en) | 2019-12-03 |
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| CN201920741590.1U Active CN209731191U (en) | 2019-05-22 | 2019-05-22 | A kind of High accuracy voltage follower of wide input voltage |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110061703A (en) * | 2019-05-22 | 2019-07-26 | 澳特翼南京电子科技有限公司 | A kind of High accuracy voltage follower of wide input voltage |
| CN111398656A (en) * | 2020-03-16 | 2020-07-10 | 西安理工大学 | High-precision battery voltage sampling circuit |
-
2019
- 2019-05-22 CN CN201920741590.1U patent/CN209731191U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110061703A (en) * | 2019-05-22 | 2019-07-26 | 澳特翼南京电子科技有限公司 | A kind of High accuracy voltage follower of wide input voltage |
| CN111398656A (en) * | 2020-03-16 | 2020-07-10 | 西安理工大学 | High-precision battery voltage sampling circuit |
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