CN108931682A - A kind of constant-current control circuit and its switched charge chip - Google Patents
A kind of constant-current control circuit and its switched charge chip Download PDFInfo
- Publication number
- CN108931682A CN108931682A CN201810847179.2A CN201810847179A CN108931682A CN 108931682 A CN108931682 A CN 108931682A CN 201810847179 A CN201810847179 A CN 201810847179A CN 108931682 A CN108931682 A CN 108931682A
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- control circuit
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- 238000005070 sampling Methods 0.000 claims abstract description 35
- 239000003990 capacitor Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 abstract description 5
- 230000005611 electricity Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Continuous-Control Power Sources That Use Transistors (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of constant-current control circuit and switched charge chips, the constant-current control circuit includes: sample circuit module and main control circuit, sample circuit module includes: internal sample resistance and current source, specifically, the charging current for flowing through external sampling resistance is compared by sample circuit module with the electric current for the internal sample resistance for flowing through sample circuit module, and obtained error is controlled by main control circuit.The present invention is directly compared with reference current by flowing through the charging current of external sampling resistance Rsns, its control information is applied in current loop by amplifier to be controlled, traditional mode compared to the prior art, present invention eliminates current sampling circuits, eliminate the process for converting current information to information of voltage, simplify the control of current loop, simultaneously because saving current sample link, can be to avoid battery charging current error caused by the error due to sample circuit, and then the precision of charging current can be higher.
Description
Technical field
The present invention relates to integrated chip technical fields, more particularly to a kind of constant-current control circuit and its switched charge core
Piece.
Background technique
With the appearance of various portable electronic products, keep our life more convenient, it is more rich and varied.Lithium ion
Battery naturally becomes the power supply of portable electronic product due to having the characteristic that can charge repeatedly, as
The switched charge chip of mainstream to charge to lithium ion battery, just has and is widely applied very much market.Conventional switched charge core
Piece is divided into (having powerpath FET) with dynamic path management and without dynamic route management (without powerpath
FET), wherein have in low and middle-end electronic product wide without the charging chip of dynamic route management since its cost is lower
Market, but this kind of chip can not obtain the information of charging current due to not having powerpath FET, so this kind of chip is all
The external sampling resistance Rsns that can connect on charge path obtains current information, as shown in Figure 1.Certainly, outer due to having
Portion sampling resistor Rsns can reduce the transfer efficiency of charging chip, so this kind of chip is not suitable for large current charge.
In order to be accurately controlled the size of charging current, conventional way is first sampled using external sampling resistance
To current information, information of voltage is then converted by resistance, feedback is into major loop control, as shown in Fig. 2, still this reality
The more extra operation of existing mode is: current information is first come out by sampling, is then converted to information of voltage, then participate in electric current loop
In road.Some error components are virtually introduced in this way, and circuit seems not succinct enough.
Summary of the invention
It is an object of the invention to propose a kind of constant-current control circuit and its switched charge chip, to realize directly using outside
Current information on portion's sampling resistor carries out the control of charging current, and simple circuit.
In order to achieve the above objectives, the present invention provides following technical schemes:
A kind of constant-current control circuit is suitable for switched charge chip, and the constant-current control circuit includes: sample circuit module
And main control circuit, the sample circuit module include: internal sample resistance and current source, in which:
The internal sample resistance is as the first end of the sample circuit module and the first end phase of external sampling resistance
Even, the second end of the sample circuit module is connected with the second end of the external sampling resistance；
Third end and institute of the common end of the internal sample resistance and the current source as the sample circuit module
The first input end for stating main control circuit is connected, and the second of the 4th end of the sample circuit module and the main control circuit is defeated
Enter end to be connected, the output end output voltage of the main control circuit；
The sample circuit module is by the charging current for flowing through the external sampling resistance and flows through the sample circuit mould
The electric current of the internal sample resistance of block is compared, and obtained error is controlled by the main control circuit.
Preferably, the main control circuit includes: operational amplifier, trsanscondutance amplifier, 3rd resistor, third capacitor,
Four resistance, the 4th capacitor and switching tube, in which:
First end and the sample circuit mould of the positive input of the trsanscondutance amplifier as the main control circuit
The second end of block is connected, second end and the sampling of the reverse input end of the trsanscondutance amplifier as the main control circuit
The third end of circuit module is connected；
The output end of the trsanscondutance amplifier is connected with the first end of the switching tube, meanwhile, the trsanscondutance amplifier
Output end passes through the 4th capacity earth by the 3rd resistor and third capacity earth；
The third end of the switching tube passes through the 4th resistance eutral grounding, the second end of the switching tube and the operational amplifier
Output end be connected, the output end output voltage as the main control circuit.
Preferably, the reverse input end of the operational amplifier is connected with external input voltage, the operational amplifier
Positive input is connected with reference voltage.
Preferably, the switching tube is NMOS tube.
Preferably, the first end of the switching tube is control terminal, and the second end of the switching tube is source electrode, the switching tube
Third end be drain electrode.
A kind of switched charge chip, comprising: constant-current control circuit described above.
It can be seen via above technical scheme that compared with prior art, the invention discloses a kind of constant-current control circuit and
Its switched charge chip, the constant-current control circuit include: sample circuit module and main control circuit, and sample circuit module includes:
Internal sample resistance and current source, in which: first end and external sampling resistance of the internal sample resistance as sample circuit module
First end be connected, the second end of sample circuit module is connected with the second end of external sampling resistance；Internal sample resistance and electricity
The common end in stream source is connected as the third end of sample circuit module with the first input end of main control circuit, sample circuit module
The 4th end be connected with the second input terminal of main control circuit, the output end output voltage of main control circuit；Sample circuit module
The charging current for flowing through external sampling resistance is compared with the electric current for the internal sample resistance for flowing through sample circuit module, is obtained
To error controlled by main control circuit.The present invention by flow through the charging current of external sampling resistance Rsns directly with
Reference current is compared, and control information is applied in current loop by amplifier and is controlled, and is passed compared to the prior art
The mode of system eliminates the process for converting current information to information of voltage, simplifies present invention eliminates current sampling circuit
The control of current loop, simultaneously because current sample link is saved, it can be to avoid caused by the error due to sample circuit
Battery charging current error, and then the precision of charging current can be higher.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is in the prior art with the charging chip schematic diagram of external sampling resistance；
Fig. 2 is the constant-current control circuit schematic diagram with external sampling resistance conventional in the prior art；
Fig. 3 is a kind of constant-current control circuit schematic diagram provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
In the present invention, the charging current for flowing through external sampling resistance Rsns is directly compared with reference current, error
Information is applied in current loop by amplifier and is controlled, compared to the prior art traditional mode, and present invention eliminates electricity
Sample circuit is flowed, the process for converting current information to information of voltage is eliminated, simplifies the control of current loop, simultaneously because
Current sample link is saved, can be to avoid battery charging current error caused by the error due to sample circuit, and then it is electric to charge
The precision of stream can be higher.
As shown in figure 3, being suitable for switched charge chip, the perseverance the embodiment of the invention provides a kind of constant-current control circuit
Flow control circuit specifically includes: sample circuit module 11 and main control circuit 12, and sample circuit module 11 includes: internal sample electricity
Hinder Rx and current source Iref, in which:
First end and external sampling resistance Rsns of the first end of internal sample resistance Rx as sample circuit module 11
First end is connected, and the second end of sample circuit module 11 is connected with the second end of external sampling resistance Rsns；Internal sample resistance
The common end of Rx and current source Iref are as the third end of sample circuit module 11 and the first input end phase of main control circuit 12
Even, the 4th end of sample circuit module 11 is connected with the second input terminal of main control circuit 12, the output end of main control circuit 12
Output voltage VC；Sample circuit module 11 is by the charging current for flowing through external sampling resistance Rsns and flows through sample circuit module 11
The electric current of internal sample resistance Rx be compared, obtained error is controlled by main control circuit 12.
Further, as shown in figure 3, main control circuit 12 includes: operational amplifier Oreg_Gm, trsanscondutance amplifier Gm,
Three resistance R3, third capacitor C3, the 4th resistance R4, the 4th capacitor C4 and switching tube M5, in which:
First end and sample circuit module 11 of the positive input (+) of trsanscondutance amplifier Gm as main control circuit 12
Second end is connected, second end and sample circuit module of the reverse input end (-) of trsanscondutance amplifier Gm as main control circuit 12
11 third end is connected；The output end of trsanscondutance amplifier Gm is connected with the first end of switching tube M5, meanwhile, trsanscondutance amplifier Gm's
Output end is grounded by 3rd resistor R3 and third capacitor C3, is grounded by the 4th capacitor C4；The third end of switching tube M5 passes through
4th resistance R4 ground connection, the second end of switching tube M5 is connected with the output end of operational amplifier Oreg_Gm, as main control circuit
12 output end output voltage VC.
Further, the reverse input end (-) of operational amplifier Oreg_Gm is connected with external input voltage VFB, and operation is put
The positive input (+) of big device Oreg_Gm is connected with reference voltage VREF.
Preferably, switching tube M5 is NMOS tube, specifically, the first end of switching tube M5 is control terminal, the of switching tube M5
Two ends are source electrode, and the third end of switching tube M5 is drain electrode.
Working principle:
Charging current flows through external sampling resistance Rsns, and the voltage difference of generation is poor (by interior with preset target voltage
The reference current in portion flows through internal sample resistance<1360ohm>generation) it is compared, if being less than, target voltage is poor, and expression is charged
Electric current is less than target value, and the voltage value of VC node can rise, and increases the duty ratio of system, flows through external sampling resistance to increase
Electric current above Rsns；On the contrary, it is poor if more than target voltage, indicate that charging current is bigger than normal, then VC node voltage value declines, and reduces
The duty ratio of system, to reduce the electric current flowed through above external sampling resistance Rsns.
The invention discloses a kind of constant-current control circuits, are suitable for switched charge chip, which includes: to adopt
Sample circuit module and main control circuit, sample circuit module include: internal sample resistance and current source, in which: internal sample electricity
Resistance is connected as the first end of sample circuit module with the first end of external sampling resistance, the second end of sample circuit module with outside
The second end of portion's sampling resistor is connected；The common end of internal sample resistance and current source as sample circuit module third end with
The first input end of main control circuit is connected, and the 4th end of sample circuit module is connected with the second input terminal of main control circuit,
The output end output voltage of main control circuit；Sample circuit module is by the charging current for flowing through external sampling resistance and flows through sampling
The electric current of the internal sample resistance of circuit module is compared, and obtained error is controlled by main control circuit.The present invention
Charging current by flowing through external sampling resistance Rsns is directly compared with reference current, and control information is made by amplifier
It uses in current loop and is controlled, compared to the prior art traditional mode, present invention eliminates current sampling circuits, save
It converts current information to the process of information of voltage, simplifies the control of current loop, simultaneously because saving current sample
Link, can be to avoid battery charging current error caused by the error due to sample circuit, and then the precision of charging current can be more
It is high.
On the basis of constant-current control circuit disclosed above, a kind of switched charge chip is also disclosed.
The embodiment of the invention also discloses a kind of switched charge chips comprising constant-current control circuit described above.
It should be noted that, in this document, the terms "include", "comprise" or its any other variant are intended to non-row
His property includes, so that including the article of a series of elements or equipment not only includes those elements, but also including not having
There is the other element being expressly recited, or further includes for this article or the intrinsic element of equipment.Do not limiting more
In the case where system, the element that is limited by sentence "including a ...", it is not excluded that including the article of above-mentioned element or setting
There is also other identical elements in standby.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (6)
1. a kind of constant-current control circuit, be suitable for switched charge chip, the constant-current control circuit include: sample circuit module and
Main control circuit, which is characterized in that the sample circuit module includes: internal sample resistance and current source, in which:
The internal sample resistance is connected as the first end of the sample circuit module with the first end of external sampling resistance, institute
The second end for stating sample circuit module is connected with the second end of the external sampling resistance；
Third end and the master of the common end of the internal sample resistance and the current source as the sample circuit module
The first input end of control circuit is connected, the 4th end of the sample circuit module and the second input terminal of the main control circuit
It is connected, the output end output voltage of the main control circuit；
The sample circuit module is by the charging current for flowing through the external sampling resistance and flows through the sample circuit module
The electric current of internal sample resistance is compared, and obtained error is controlled by the main control circuit.
2. constant-current control circuit according to claim 1, which is characterized in that the main control circuit includes: operation amplifier
Device, trsanscondutance amplifier, 3rd resistor, third capacitor, the 4th resistance, the 4th capacitor and switching tube, in which:
First end and the sample circuit module of the positive input of the trsanscondutance amplifier as the main control circuit
Second end is connected, second end and the sample circuit of the reverse input end of the trsanscondutance amplifier as the main control circuit
The third end of module is connected；
The output end of the trsanscondutance amplifier is connected with the first end of the switching tube, meanwhile, the output of the trsanscondutance amplifier
End passes through the 4th capacity earth by the 3rd resistor and third capacity earth；
By the 4th resistance eutral grounding, the second end of the switching tube is defeated with the operational amplifier at the third end of the switching tube
Outlet is connected, the output end output voltage as the main control circuit.
3. constant-current control circuit according to claim 2, which is characterized in that the reverse input end of the operational amplifier with
External input voltage is connected, and the positive input of the operational amplifier is connected with reference voltage.
4. constant-current control circuit according to claim 2, which is characterized in that the switching tube is NMOS tube.
5. constant-current control circuit according to claim 2, which is characterized in that the first end of the switching tube is control terminal,
The second end of the switching tube is source electrode, and the third end of the switching tube is drain electrode.
6. a kind of switched charge chip characterized by comprising current constant control described in the claims 1-5 any one
Circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810847179.2A CN108931682B (en) | 2018-07-27 | 2018-07-27 | Constant current control circuit and switch charging chip thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810847179.2A CN108931682B (en) | 2018-07-27 | 2018-07-27 | Constant current control circuit and switch charging chip thereof |
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| Publication Number | Publication Date |
|---|---|
| CN108931682A true CN108931682A (en) | 2018-12-04 |
| CN108931682B CN108931682B (en) | 2024-05-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810847179.2A Active CN108931682B (en) | 2018-07-27 | 2018-07-27 | Constant current control circuit and switch charging chip thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111463855A (en) * | 2020-04-02 | 2020-07-28 | 无锡艾为集成电路技术有限公司 | Charging control circuit and charging control method, electronic equipment and charging method thereof |
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2018
- 2018-07-27 CN CN201810847179.2A patent/CN108931682B/en active Active
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| Title |
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| 王新宇: "基于恒流/恒压方式的锂离子电池开关充电芯片的设计", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》, no. 3, pages 042 - 1613 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111463855A (en) * | 2020-04-02 | 2020-07-28 | 无锡艾为集成电路技术有限公司 | Charging control circuit and charging control method, electronic equipment and charging method thereof |
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| CN108931682B (en) | 2024-05-24 |
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