CN208705397U - A kind of high accuracy battery voltage sampling circuit - Google Patents
A kind of high accuracy battery voltage sampling circuit Download PDFInfo
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- CN208705397U CN208705397U CN201821325649.0U CN201821325649U CN208705397U CN 208705397 U CN208705397 U CN 208705397U CN 201821325649 U CN201821325649 U CN 201821325649U CN 208705397 U CN208705397 U CN 208705397U
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Abstract
The utility model provides a kind of high accuracy battery voltage sampling circuit, including battery, decompression voltage regulator and single-chip microcontroller；The input terminal of decompression voltage regulator is connected to the anode of battery；The output end of decompression voltage regulator is connected to the port ADC of single-chip microcontroller；The power input port of single-chip microcontroller is connected to the anode of battery.High accuracy battery voltage sampling circuit provided by the utility model, use cell output voltage directly for single-chip microcontroller power supply, a burning voltage is exported as sampled voltage by decompression voltage regulator, single-chip microcontroller goes to sample stable sampled voltage on the basis of cell output voltage, so as to accurately inversely converse the output voltage of battery；While improving battery voltage sampling precision, simplifies circuit structure, reduce production cost.
Description
Technical field
The utility model relates to electronic technology field, in particular to a kind of high accuracy battery voltage sampling circuit.
Background technique
Existing lithium battery product is more more and more universal, since voltage of the lithium battery in charge and discharge process is to change always
, so needing to detect cell voltage to carry out battery capacity indication or battery protection.Currently in order to cell voltage is effectively detected,
Generally use following two implementation:
Mode 1 is boosting method, provides a stable voltage using DC-DC boost module and works to single-chip microcontroller, electric in this way
The variation of cell voltage does not interfere with the voltage of single-chip microcontroller, and single-chip microcontroller carries out the detection of voltage, voltage using the channel AD to battery
Sampling carries out the conversion of AD numerical value after boosting on the basis of the voltage of stable power-supplying.This mode because to increase DC-DC boost module,
Module includes boost chip, inductance, capacitor, higher cost, and the precision of boost chip usually only 5%, high-precision liter
Press chip price expensive.
Mode 2 is voltage drop method, provides a stable voltage using LDO voltage reduction module and works to single-chip microcontroller, cell voltage
Fluctuation do not interfere with the operating voltage of single-chip microcontroller, single-chip microcontroller carries out the detection of voltage using the channel AD to battery, and voltage is adopted
Sample after being depressured on the basis of the voltage of stable power-supplying carry out the conversion of AD numerical value, this mode because use decompression mode, single-chip microcontroller
Operating voltage is centainly less than the voltage of battery, so the voltage of battery just can detecte after being divided, increases battery
The power consumption of sampling circuit；And in order to realize low-power consumption, it generally requires additional I/O port driving switch pipe and carries out the logical of sampling circuit
Disconnected control, virtually increases required hardware cost.
Therefore, in the market a kind of high-precision of urgent need, low cost battery voltage sampling circuit.
Utility model content
To solve the above-mentioned deficiency mentioned in the prior art, the utility model provides a kind of high accuracy battery voltage sample electricity
Road, including battery, decompression voltage regulator and single-chip microcontroller；The single-chip microcontroller is the single-chip microcontroller with AD sampling functions；
The input terminal of the decompression voltage regulator is connected to the anode of the battery；The output end of the decompression voltage regulator
It is connected to the port ADC of the single-chip microcontroller；The power input port of the single-chip microcontroller is connected to the anode of the battery.
Further, the decompression voltage regulator includes lowering and stabilizing blood pressure chip, capacitor C1 and capacitor C2；
The input terminal of the lowering and stabilizing blood pressure chip is connected to the anode of the battery；The input terminal of the lowering and stabilizing blood pressure chip
Ground wire is also connected to by capacitor C1；The output end of the lowering and stabilizing blood pressure chip is connected to the port ADC of the single-chip microcontroller；It is described
The output end of lowering and stabilizing blood pressure chip also passes through capacitor C2 and is connected to ground wire.
Further, the model 78L02 of the lowering and stabilizing blood pressure chip.
Further, the model HT66F004 of the single-chip microcontroller.
Further, the power input port of the single-chip microcontroller is connected to ground wire by capacitor C3.
High accuracy battery voltage sampling circuit provided by the utility model uses cell output voltage directly for single-chip microcontroller confession
Electricity exports a burning voltage as sampled voltage by decompression voltage regulator, and single-chip microcontroller goes to adopt on the basis of cell output voltage
The stable sampled voltage of sample, so as to accurately inversely converse the output voltage of battery；Improving battery voltage sampling essence
While spending, simplifies circuit structure, reduce production cost.
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
Some embodiments of the utility model, for those of ordinary skill in the art, without creative efforts,
It is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of circuit diagram of high accuracy battery voltage sampling circuit provided by the utility model.
Specific embodiment
It is practical new below in conjunction with this to keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer
Attached drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that is retouched
The embodiment stated is the utility model a part of the embodiment, instead of all the embodiments.Based on the implementation in the utility model
Example, every other embodiment obtained by those of ordinary skill in the art without making creative efforts belong to
The range of the utility model protection.
" first ", " second " used in the utility model embodiment and similar word be not offered as any sequence,
Quantity or importance, and be only intended to distinguish different component parts.The similar word such as " one end ", " other end ", simply means to
The orientation or positional relationship of showing device or element is is based on the orientation or positional relationship shown in the drawings, rather than indication or suggestion institute
The device or element of finger must have a particular orientation, be constructed and operated in a specific orientation.The classes such as " comprising " or "comprising"
Like word mean the element before the word or object out cover appear in the word presented hereinafter element or object and its
It is equivalent, and it is not excluded for other elements or object." connection " either the similar word such as " connected " is not limited to physics or machine
The connection of tool, but may include electrical connection, it is either direct or indirect.
Fig. 1 is a kind of circuit diagram of high accuracy battery voltage sampling circuit provided by the embodiment of the utility model；Such as
Shown in Fig. 1, high accuracy battery voltage sampling circuit provided by the utility model, including battery, decompression voltage regulator and single-chip microcontroller；
The single-chip microcontroller is the single-chip microcontroller with AD sampling functions；
The input terminal of the decompression voltage regulator is connected to the anode of the battery；The output end of the decompression voltage regulator
It is connected to the port ADC of the single-chip microcontroller；The power input port of the single-chip microcontroller is connected to the anode of the battery.
When it is implemented, as shown in Figure 1, high accuracy battery voltage sampling circuit provided by the utility model, including battery
(B1 as shown in Figure 1), decompression voltage regulator and single-chip microcontroller (U1 as shown in Figure 1)；Wherein single-chip microcontroller is to sample function with AD
Can single-chip microcontroller, the utility model implement in, the model HT66F004 of the single-chip microcontroller of selection；As shown in Figure 1, the of single-chip microcontroller
16 pins are power input port；14th pin of single-chip microcontroller is the port ADC with AD sampling functions, and the port ADC is used as and adopts
The input port of sample voltage；The voltage input port of single-chip microcontroller is connected to the anode of battery, and battery is directly single-chip microcontroller power supply, single
The operating voltage of piece machine is the output voltage of battery；
Decompression voltage regulator in the utility model embodiment includes lowering and stabilizing blood pressure chip (U2 as shown in Figure 1), capacitor
C1 and capacitor C2；Wherein, the input terminal of lowering and stabilizing blood pressure chip is connected to the anode of battery, the output end connection of lowering and stabilizing blood pressure chip
To the port ADC of single-chip microcontroller；The input terminal and output end of lowering and stabilizing blood pressure chip pass through capacitor C1 respectively and capacitor C2 is connected to the ground
Line.In this practical new embodiment, the model 78L02 of lowering and stabilizing blood pressure chip；It is exported in lowering and stabilizing blood pressure chip output stable
2V DC voltage, the i.e. voltage that the ADC Port detecting of single-chip microcontroller arrives are 2V；Decompression voltage regulator can be built in single-chip microcontroller,
Also it can be set in SCM peripheral.When using the single-chip microcontroller for being built-in with decompression voltage regulator, due to without additionally building drop
Voltage regulator circuit is pressed, can reduce production cost.
High accuracy battery voltage sampling circuit provided by the embodiment of the utility model, the power supply of single-chip microcontroller directly take battery
Voltage, the operating voltage of single-chip microcontroller is equal to the output voltage Vbat of battery；The port ADC of decompression voltage regulator to single-chip microcontroller is defeated
2V burning voltage out, that is, the battery sampling voltage of single-chip microcontroller is 2V, corresponding ADC conversion value is B.Assuming that single-chip microcontroller
Corresponding maximum ADC conversion value is A, and according to the principle that Chip Microcomputer A/D C is converted, formula can be obtained: 2V/Vbat=B/A, due to list
The corresponding maximum ADC conversion value A of piece machine, the corresponding ADC conversion value B of battery sampling voltage are determining numerical value, therefore can count
Calculation obtains cell voltage i.e. cell voltage Vbat=2V*A/B.
Single-chip microcontroller removes the voltage of sampling 2V on the basis of cell output voltage, although cell output voltage is variation,
It is the voltage that arrives of ADC Port detecting of single-chip microcontroller 2V voltage stable always.Because the precision of lowering and stabilizing blood pressure chip can accomplish
1%, and have no other parameters in circuit and will affect sampling, so overall battery voltage sampling precision can achieve 1%.
And high accuracy battery voltage sampling circuit provided by the embodiment of the utility model, circuit structure is simple, and the component used is few, raw
It produces at low cost.
High accuracy battery voltage sampling circuit provided by the embodiment of the utility model uses cell output voltage directly to be single
The power supply of piece machine exports a burning voltage as sampled voltage by decompression voltage regulator, and single-chip microcontroller is using cell output voltage as base
Standard goes to sample stable sampled voltage, so as to accurately inversely converse the output voltage of battery；Improving cell voltage
While sampling precision, simplifies circuit structure, reduce production cost.
Preferably, the power input port of the single-chip microcontroller is connected to ground wire by capacitor C3.When it is implemented, such as Fig. 1
Shown, the power input of single-chip microcontroller is connected to ground wire by capacitor C3, and the input voltage of single-chip microcontroller can be made by capacitor C3
It is more stable, further increase the accuracy of battery voltage sampling.
Although more herein used the arts such as battery, single-chip microcontroller, lowering and stabilizing blood pressure chip, capacitor, the port ADC
Language, but it does not exclude the possibility of using other terms.The use of these items is only for be more convenient to describe and explain this
The essence of utility model；It is contrary to the spirit of the present invention to interpret them as any one of the additional limitations.
Finally, it should be noted that the above various embodiments is only to illustrate the technical solution of the utility model, rather than it is limited
System；Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should
Understand: it is still possible to modify the technical solutions described in the foregoing embodiments, or to some or all of
Technical characteristic is equivalently replaced；And these are modified or replaceed, it does not separate the essence of the corresponding technical solution, and this is practical new
The range of each embodiment technical solution of type.
Claims (5)
1. a kind of high accuracy battery voltage sampling circuit, it is characterised in that: including battery, decompression voltage regulator and single-chip microcontroller；Institute
Stating single-chip microcontroller is the single-chip microcontroller with AD sampling functions；
The input terminal of the decompression voltage regulator is connected to the anode of the battery；The output end of the decompression voltage regulator connects
To the port ADC of the single-chip microcontroller；The power input port of the single-chip microcontroller is connected to the anode of the battery.
2. high accuracy battery voltage sampling circuit according to claim 1, it is characterised in that: the decompression voltage regulator packet
Include lowering and stabilizing blood pressure chip, capacitor C1 and capacitor C2；
The input terminal of the lowering and stabilizing blood pressure chip is connected to the anode of the battery；The input terminal of the lowering and stabilizing blood pressure chip is also logical
It crosses capacitor C1 and is connected to ground wire；The output end of the lowering and stabilizing blood pressure chip is connected to the port ADC of the single-chip microcontroller；The decompression
The output end of voltage stabilizing chip also passes through capacitor C2 and is connected to ground wire.
3. high accuracy battery voltage sampling circuit according to claim 2, it is characterised in that: the lowering and stabilizing blood pressure chip
Model 78L02.
4. high accuracy battery voltage sampling circuit according to claim 1, it is characterised in that: the model of the single-chip microcontroller
HT66F004。
5. high accuracy battery voltage sampling circuit according to claim 1, it is characterised in that: the power supply of the single-chip microcontroller is defeated
Inbound port is connected to ground wire by capacitor C3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821325649.0U CN208705397U (en) | 2018-08-16 | 2018-08-16 | A kind of high accuracy battery voltage sampling circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821325649.0U CN208705397U (en) | 2018-08-16 | 2018-08-16 | A kind of high accuracy battery voltage sampling circuit |
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| Publication Number | Publication Date |
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| CN208705397U true CN208705397U (en) | 2019-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201821325649.0U Active CN208705397U (en) | 2018-08-16 | 2018-08-16 | A kind of high accuracy battery voltage sampling circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109980927A (en) * | 2019-04-11 | 2019-07-05 | 欣旺达电子股份有限公司 | Two-way non-isolated DC-DC circuit and charging/discharging apparatus |
| CN111426963A (en) * | 2020-04-20 | 2020-07-17 | 上海和宗焊接设备制造有限公司 | Electric quantity sampling and measuring system of battery welding machine and testing method thereof |
-
2018
- 2018-08-16 CN CN201821325649.0U patent/CN208705397U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109980927A (en) * | 2019-04-11 | 2019-07-05 | 欣旺达电子股份有限公司 | Two-way non-isolated DC-DC circuit and charging/discharging apparatus |
| CN111426963A (en) * | 2020-04-20 | 2020-07-17 | 上海和宗焊接设备制造有限公司 | Electric quantity sampling and measuring system of battery welding machine and testing method thereof |
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