CN209731201U - A kind of high precision wide range voltage comparator circuit - Google Patents
A kind of high precision wide range voltage comparator circuit Download PDFInfo
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- CN209731201U CN209731201U CN201920740817.0U CN201920740817U CN209731201U CN 209731201 U CN209731201 U CN 209731201U CN 201920740817 U CN201920740817 U CN 201920740817U CN 209731201 U CN209731201 U CN 209731201U
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Abstract
The utility model discloses a kind of high precision wide range voltage comparator circuits, standard comparator circuit including multiple metal-oxide-semiconductors composition, and the clamp circuit of comparator, power supply circuit and adjustment circuit, the clamp circuit is used to make 3 VGS voltages of voltage between node VHigh and node VLow, the power supply circuit is made of constant-current source I1 and I2, the constant-current source I1 and I2 constitutes the ground to float and power supply as comparator power supply, the adjustment circuit includes constant-current source I3, metal-oxide-semiconductor M11 and metal-oxide-semiconductor M12, the constant-current source I3 input terminal connecting node VHigh, output end ground connection, it is arranged between high-voltage end VB and node VLow after the metal-oxide-semiconductor M11 and metal-oxide-semiconductor M12 series connection.The utility model realizes the comparison of full voltage range in system by using low-voltage device, low in cost, uses simple and flexible.
Description
Technical field
The utility model relates to a kind of high precision wide range voltage comparator circuits, belong to electronic technology field.
Background technique
The concatenated field of lithium battery is used numerous, such as in new-energy automobile, since the series connection joint number of battery pack is different,
The voltage range for needing to detect can be very different.Traditional comparator circuit or compare between ground potential to 5V
Voltage or compare the voltage subtracted between 5V from maximum potential to maximum potential, or realizes high potential using divider resistance
Compare after partial pressure, or uses the MOS device of high gate source voltage (Vgs) as input to pipe, but sacrifice precision and increasing in this way
Cost is added, and if system full voltage range has been more than the pressure-resistant range of the MOS device of high gate source voltage Vgs, this ratio
Compared with device it is necessary that with the device of more high voltage.Therefore, currently needing a kind of same circuit of use can realize that wide scope is defeated
Enter the comparator circuit of voltage.
Utility model content
The purpose of this utility model is to provide the high precision wide ranges that a kind of power supply potential and ground potential all can be adaptive
Voltage comparator circuit can be compared monitoring to any one current potential in entire battery pack, without additional complexity
Circuit.
To achieve the above object, the technical solution that the utility model is taken is as follows:
A kind of high precision wide range voltage comparator circuit, the standard comparator circuit including multiple metal-oxide-semiconductors composition, and ratio
Compared with the clamp circuit, power supply circuit and adjustment circuit of device, the clamp circuit is for making between node VHigh and node VLow
Voltage is 3 VGS voltages, and the power supply circuit is made of constant-current source I1 and I2, and the constant-current source I1 and I2 constitute the ground to float
It is comparator power supply with power supply, the adjustment circuit includes constant-current source I3, metal-oxide-semiconductor M11 and metal-oxide-semiconductor M12, the constant-current source I3 defeated
Enter to hold connecting node VHigh, output end ground connection is arranged after the metal-oxide-semiconductor M11 and metal-oxide-semiconductor M12 series connection in high-voltage end VB and node
Between VLow.
Further, the standard comparator circuit includes metal-oxide-semiconductor M1, M2, M3, M4, M5, M9 and M10, entire comparator
The common-mode voltage of circuit is determined by the reference voltage that the end INN inputs.
Further, the clamp circuit forms by way of being connected by metal-oxide-semiconductor M6, M7 and M8 grid drain electrode, and MOS
The input terminal of the source connecting node VLow and constant-current source I1 of pipe M6, the source connecting node VHigh and constant-current source I3 of metal-oxide-semiconductor M8
Input terminal.
Further, each metal-oxide-semiconductor in the voltage comparator circuit is N-type metal-oxide-semiconductor.
Further, the source electrode of the metal-oxide-semiconductor M12 connects high-voltage end VB, and grid and drain electrode connect the source electrode of metal-oxide-semiconductor M12,
The drain electrode connecting node VLow of metal-oxide-semiconductor M12.
Further, the constant-current source I1 is 40uA, and constant-current source I2 is 40uA, and constant-current source I3 is 10uA.
The utility model has the following beneficial effects: the common-mode voltage of the utility model comparator can be from ground potential (gnd)
To the wide scope of system maximum potential (VB), so that the utility model be allow to carry out in new energy car battery group any one
The comparison of a current potential and reference potential.Meanwhile this circuit realizes the comparison of full voltage range in system, cost with low-voltage device
It is cheap, use simple and flexible.
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
Fig. 1 is the circuit connection diagram of the utility model.
Specific embodiment
The utility model is described in detail in the following with reference to the drawings and specific embodiments.
As shown in Figure 1, a kind of high precision wide range voltage comparator circuit, the standard comparator including multiple metal-oxide-semiconductors composition
The clamp circuit of circuit and comparator, power supply circuit and adjustment circuit, the clamp circuit is for making node VHigh and section
Voltage between point VLow is 3 VGS voltages, and the power supply circuit is made of constant-current source I1 and I2, the constant-current source I1 and I2
The ground to float and power supply are constituted as comparator power supply, the adjustment circuit includes constant-current source I3, metal-oxide-semiconductor M11 and metal-oxide-semiconductor M12, institute
Constant-current source I3 input terminal connecting node VHigh is stated, output end ground connection is arranged after the metal-oxide-semiconductor M11 and metal-oxide-semiconductor M12 series connection in height
Between pressure side VB and node VLow.
In the present embodiment, each metal-oxide-semiconductor is N-type metal-oxide-semiconductor.The clamp circuit is leaked by metal-oxide-semiconductor M6, M7 and M8 by grid
Extremely connected mode forms, and the input terminal of the source connecting node VLow and constant-current source I1 of metal-oxide-semiconductor M6, the source of metal-oxide-semiconductor M8
Connecting node VHigh and constant-current source I3 input terminal.The source electrode of the metal-oxide-semiconductor M12 connects high-voltage end VB, grid and drain electrode connection
The source electrode of metal-oxide-semiconductor M12, the grid of metal-oxide-semiconductor M12 are biased electrical pressure side, and drain connecting node VLow.The constant-current source I1 is
40uA, constant-current source I2 are 40uA, and constant-current source I3 is 10uA.
This circuit theory are as follows: high-precision voltage comparator circuit is realized using low-voltage device.Use the power supply of floating and floating
Low-voltage device is protected on dynamic ground, at the same the floating power supply and ground absolute voltage-to-ground again can adaptively with input
The variation of voltage and change.
Circuit such as Fig. 1: M1 to M10 constitutes typical comparator circuit.Wherein M6, M7 and M8 constitute the pincers of this comparator
Position circuit, makes 3 VGS voltages of voltage between node VHigh and node VLow, to protect internal low-voltage circuit will not be because
It is damaged for overtension.The common-mode voltage of entire comparator circuit is determined by the reference voltage that the end INN inputs.When M1 pipe
When grid (gate) voltage is higher than grid (gate) voltage of M2 pipe, Vout exports the voltage as VHigh current potential, works as M1
When grid (gate) voltage of pipe is lower than grid (gate) voltage of M2 pipe, Vout exports an electricity as Vlow current potential
Pressure.
I1 and I2 constitutes the ground to float and power supply as comparator power supply.The circuit of I3 and M11, M12 I1 and I2 in order to prevent
Between mismatch (mismatch), make the common-mode voltage of comparator that offset upwardly or downwardly occur.Such as due to
Mismatch makes 1 point of I2 > I3, if without I3 and M11, the circuit of M12, the power supply of entire comparator and ground can be leapt high to
VB voltage, then comparator cisco unity malfunction.And having I3 and M11, the circuit of M12, the electric current as caused by mismatch can
Automatically to be adjusted by IM11, to ensure that the common-mode voltage of comparator is only determined by input voltage.
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 (6)
1. a kind of high precision wide range voltage comparator circuit, the standard comparator circuit including multiple metal-oxide-semiconductors composition, feature exist
In: it further include the clamp circuit, power supply circuit and adjustment circuit of comparator, the clamp circuit is for making node VHigh and section
Voltage between point VLow is 3 VGS voltages, and the power supply circuit is made of constant-current source I1 and I2, the constant-current source I1 and I2
The ground to float and power supply are constituted as comparator power supply, the adjustment circuit includes constant-current source I3, metal-oxide-semiconductor M11 and metal-oxide-semiconductor M12, institute
Constant-current source I3 input terminal connecting node VHigh is stated, output end ground connection is arranged after the metal-oxide-semiconductor M11 and metal-oxide-semiconductor M12 series connection in height
Between pressure side VB and node VLow.
2. a kind of high precision wide range voltage comparator circuit according to claim 1, it is characterised in that: the standard comparing
Device circuit includes metal-oxide-semiconductor M1, M2, M3, M4, M5, M9 and M10, the ginseng that the common-mode voltage of entire comparator circuit is inputted by the end INN
Examine voltage decision.
3. a kind of high precision wide range voltage comparator circuit according to claim 1 or 2, it is characterised in that: the clamper
Circuit forms by way of being connected by metal-oxide-semiconductor M6, M7 and M8 grid drain electrode, and the source connecting node VLow of metal-oxide-semiconductor M6 and
The input terminal of constant-current source I1, the source connecting node VHigh and constant-current source I3 input terminal of metal-oxide-semiconductor M8.
4. a kind of high precision wide range voltage comparator circuit according to claim 1, it is characterised in that: the voltage compares
Each metal-oxide-semiconductor in circuit is N-type metal-oxide-semiconductor.
5. a kind of high precision wide range voltage comparator circuit according to claim 1 or 4, it is characterised in that: the metal-oxide-semiconductor
The source electrode of M12 connects high-voltage end VB, the source electrode of grid and drain electrode connection metal-oxide-semiconductor M12, the drain electrode connecting node of metal-oxide-semiconductor M12
VLow。
6. a kind of high precision wide range voltage comparator circuit according to claim 1, it is characterised in that: the constant-current source I1
It is 40uA for 40uA, constant-current source I2, constant-current source I3 is 10uA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920740817.0U CN209731201U (en) | 2019-05-22 | 2019-05-22 | A kind of high precision wide range voltage comparator circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920740817.0U CN209731201U (en) | 2019-05-22 | 2019-05-22 | A kind of high precision wide range voltage comparator circuit |
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| Publication Number | Publication Date |
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| CN209731201U true CN209731201U (en) | 2019-12-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920740817.0U Active CN209731201U (en) | 2019-05-22 | 2019-05-22 | A kind of high precision wide range voltage comparator circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110113034A (en) * | 2019-05-22 | 2019-08-09 | 澳特翼南京电子科技有限公司 | A kind of high precision wide range voltage comparator circuit |
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2019
- 2019-05-22 CN CN201920740817.0U patent/CN209731201U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110113034A (en) * | 2019-05-22 | 2019-08-09 | 澳特翼南京电子科技有限公司 | A kind of high precision wide range voltage comparator circuit |
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