CN101814756B - Constant-current and constant-voltage control circuit, charging circuit and charger - Google Patents
Constant-current and constant-voltage control circuit, charging circuit and charger Download PDFInfo
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- CN101814756B CN101814756B CN2010101483538A CN201010148353A CN101814756B CN 101814756 B CN101814756 B CN 101814756B CN 2010101483538 A CN2010101483538 A CN 2010101483538A CN 201010148353 A CN201010148353 A CN 201010148353A CN 101814756 B CN101814756 B CN 101814756B
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Abstract
The invention is applicable for the field of charging circuits and provides a constant-current and constant-voltage control circuit, a charging circuit and a charger, wherein the constant-current and constant-voltage control circuit comprises a constant-current and constant-voltage control unit. In the invention, the constant-current and constant-voltage control circuit adopts a feedback structure and carries out constant-current charging on a battery and then constant-voltage charging according to the detected battery voltage. With the structure, the constant-current and constant-voltage control circuit only has a low-frequency pole in the transitional process from the constant-current charging to the constant-voltage charging and thereby improving the stability of the transitional process.
Description
Technical field
The invention belongs to the charging circuit field, relate in particular to a kind of constant-current and constant-voltage control circuit, charging circuit and charger.
Background technology
General charger adopts constant current charge when beginning to charge; So that improve the efficient of charging with bigger electric current; By the time battery when being full of soon, is used constant voltage charge instead, this constant voltage value is exactly the terminal voltage value of battery when being full of; In case reached this voltage, the terminal voltage of battery equates with the output voltage of charger fully.
Therefore, all adopt constant-current and constant-voltage control circuit to realize above-mentioned purpose in a lot of chargers, but adopted existing constant-current and constant-voltage control circuit to the transient process of constant voltage charge, having the bad problem of stability from constant current charge.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of constant-current and constant-voltage control circuit, is intended to solve existing constant-current and constant-voltage control circuit and to the transient process of constant voltage charge, has the bad problem of stability from constant current charge.
The embodiment of the invention is achieved in that a kind of constant-current and constant-voltage control circuit, and said constant-current and constant-voltage control circuit comprises:
Input termination power, test side and output connect the constant current constant voltage control unit of battery respectively, are used to detect said cell voltage, when voltage does not reach voltage threshold, battery are carried out constant current charge, when voltage reaches voltage threshold, battery are carried out constant voltage charge;
Said constant current constant voltage control unit comprises:
Voltage control loop and current controlled circuit;
Said voltage control loop comprises switching device and voltage control circuit; The input termination power of said switching device; The output termination battery of said switching device, first end of the control termination voltage control circuit of said switching device, the second termination battery of said voltage control circuit;
The control end of the first termination switching device of said current controlled circuit, the second termination battery of said current controlled circuit;
Said switching device adopts first metal-oxide-semiconductor; The source electrode of said first metal-oxide-semiconductor connects power supply, and the drain electrode of said first metal-oxide-semiconductor connects battery, and said voltage control circuit comprises first resistance, second resistance, voltage amplifier and second metal-oxide-semiconductor; The drain electrode of said first metal-oxide-semiconductor of first termination of said first resistance; First end of said second resistance of second termination of said first resistance, the second end ground connection of said second resistance, the in-phase input end of said voltage amplifier connects reference voltage; The inverting input of said voltage amplifier connects second end of said first resistance; The grid of said second metal-oxide-semiconductor of output termination of said voltage amplifier, the source electrode of said second metal-oxide-semiconductor connects power supply, and the drain electrode of said second metal-oxide-semiconductor connects the grid of said first metal-oxide-semiconductor;
When cell voltage was low, said constant-current and constant-voltage control circuit was in the constant current charge process;
When the inverting input voltage of voltage amplifier during near reference voltage; Be that cell voltage reaches voltage threshold, the voltage amplifier output end voltage descends, the second metal-oxide-semiconductor conducting; At this moment; First metal-oxide-semiconductor, first resistance, second resistance, voltage amplifier and second metal-oxide-semiconductor constitute a LDO pressurizer, the output constant voltage, said constant-current and constant-voltage control circuit with constant voltage to battery charge.
Another purpose of the embodiment of the invention is to provide a kind of charging circuit, and said charging circuit comprises above-mentioned constant-current and constant-voltage control circuit.
Another purpose of the embodiment of the invention is to provide a kind of charger, and said charger comprises above-mentioned charging circuit.
In embodiments of the present invention; This constant-current and constant-voltage control circuit adopts feedback arrangement, and the cell voltage according to detecting carries out constant current charge earlier to battery; Carry out constant voltage charge again; Adopt this structure, only there is a low-frequency pole in constant-current and constant-voltage control circuit from constant current charge to the transient process of constant voltage charge, has therefore improved the stability of transient process.
Description of drawings
Fig. 1 is the structure chart of the constant-current and constant-voltage control circuit that provides of the embodiment of the invention;
Fig. 2 is the exemplary circuit figure of the constant-current and constant-voltage control circuit that provides of the embodiment of the invention.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
In embodiments of the present invention; This constant-current and constant-voltage control circuit adopts feedback arrangement, and the cell voltage according to detecting carries out constant current charge earlier to battery; Carry out constant voltage charge again; Adopt this structure, only there is a low-frequency pole in constant-current and constant-voltage control circuit from constant current charge to the transient process of constant voltage charge, has therefore improved the stability of transient process.
Fig. 1 shows the structure of the constant-current and constant-voltage control circuit that the embodiment of the invention provides, and for the ease of explanation, only shows the part relevant with the embodiment of the invention.
Constant-current and constant-voltage control circuit comprises constant current constant voltage control unit 100; The input termination power of constant current constant voltage control unit 100, the test side of constant current constant voltage control unit 100 and output connect battery respectively, and constant current constant voltage control unit 100 detects cell voltage; When voltage does not reach voltage threshold; Battery is carried out constant current charge,, battery is carried out constant voltage charge when voltage reaches voltage threshold.
As one embodiment of the invention, constant current constant voltage control unit 100 comprises voltage control loop 101 and current controlled circuit 102.
Voltage control loop 101 comprises switching device 1011 and voltage control circuit 1012; The input termination power of switching device 1011; The output termination battery of switching device 1011; First end of the control termination voltage control circuit 1012 of switching device 1011, the second termination battery of voltage control circuit 1012.
The control end of the first termination switching device 1011 of current controlled circuit 102, the second termination battery of current controlled circuit 102.
Constant-current and constant-voltage control circuit also comprises charging current detecting unit 200; The input termination battery of charging current detecting unit 200; The control end of the switching device 1011 of output termination constant current constant voltage control unit 100; Reach current threshold if detect the charging current of battery, 100 pairs of batteries of charging current detecting unit 200 control constant current constant voltage control units stop charging.
Fig. 2 shows the exemplary circuit structure of the constant-current and constant-voltage control circuit that the embodiment of the invention provides, and for the ease of explanation, only shows the part relevant with the embodiment of the invention.
As one embodiment of the invention, switching device 1011 adopts the first metal-oxide-semiconductor Q1, and the source electrode of the first metal-oxide-semiconductor Q1 connects power supply; The drain electrode of the first metal-oxide-semiconductor Q1 connects battery; Voltage control circuit 1012 comprises first resistance R 1, second resistance R 2, voltage amplifier U1 and the second metal-oxide-semiconductor Q2, the drain electrode of first termination, the first metal-oxide-semiconductor Q1 of first resistance R 1, first end of second termination, second resistance R 2 of first resistance R 1; The second end ground connection of second resistance R 2; The in-phase input end of voltage amplifier U1 meets reference voltage V ref, and the inverting input of voltage amplifier U1 connects second end of first resistance R 1, the grid of the output termination second metal-oxide-semiconductor Q2 of voltage amplifier U1; The source electrode of the second metal-oxide-semiconductor Q2 connects power supply, and the drain electrode of the second metal-oxide-semiconductor Q2 connects the grid of the first metal-oxide-semiconductor Q1.
Current controlled circuit 102 comprises the 3rd metal-oxide-semiconductor Q3, the 4th metal-oxide-semiconductor Q4, current amplifier U2 and the 3rd resistance R 3; The inverting input of current amplifier U2 meets battery eliminator voltage Vb; The in-phase input end of current amplifier U2 connects the drain electrode of first end and the 3rd metal-oxide-semiconductor Q3 of the 3rd resistance R 3; The source electrode of the 3rd metal-oxide-semiconductor Q3 connects the drain electrode of the 4th metal-oxide-semiconductor Q4, and the source electrode of the 4th metal-oxide-semiconductor Q4 connects power supply, and the grid of the 4th metal-oxide-semiconductor Q4 connects the output of current amplifier U2.
Charging current detecting unit 200 comprises the 3rd metal-oxide-semiconductor Q3, the 4th metal-oxide-semiconductor Q4, adapter amplifier U3 and the 3rd resistance R 3; The source electrode of the 4th metal-oxide-semiconductor Q4 connects power supply; The grid of the 4th metal-oxide-semiconductor Q4 connects the grid of the first metal-oxide-semiconductor Q1; The drain electrode of the 4th metal-oxide-semiconductor Q4 connects the inverting input of adapter amplifier U3 and the source electrode of the 3rd metal-oxide-semiconductor Q3, and the in-phase input end of adapter amplifier U3 connects battery, the grid of output termination the 3rd metal-oxide-semiconductor Q3 of adapter amplifier U3; The drain electrode of the 3rd metal-oxide-semiconductor Q3 connects first end of the 3rd resistance R 3, the second end ground connection of the 3rd resistance R 3.
The operation principle of this constant-current and constant-voltage control circuit is:
The constant current charge process:
When cell voltage was low, cell voltage did not reach voltage threshold, and voltage amplifier U1 exports high level; The second metal-oxide-semiconductor Q2 ends, and the G point voltage is fully by current amplifier U2 decision, at this moment; The first metal-oxide-semiconductor Q1 will provide size for the constant charge current of 1000Vb/R3 to battery, and when cell voltage was lower than 2.9V, the voltage of battery eliminator voltage Vb was 0.1V; Charging current is 0.1C (a C=charging and discharging currents (mA)/battery capacity (mAh)); When cell voltage was higher than 2.9V and is lower than 4.2V, the voltage of battery eliminator voltage Vb was 1V, and charging current is 1C.
The constant voltage charge process:
When the inverting input voltage of voltage amplifier U1 during near reference voltage V ref; Be that cell voltage reaches voltage threshold; Voltage amplifier U1 output end voltage descends, the second metal-oxide-semiconductor Q2 conducting, at this moment; The first metal-oxide-semiconductor Q1, first resistance R 1, second resistance R 2, voltage amplifier U1 and the second metal-oxide-semiconductor Q2 constitute a LDO pressurizer, and output voltage is:
Vbat＝(1+R1/R2)Vref；
At this moment, constant-current and constant-voltage control circuit with constant 4.2V voltage to battery charge.
The charging current testing process:
In to the process of battery with constant-potential charge; The charging current of battery reduces gradually; The charging current that detects battery when charging current detecting unit 200 is reduced to current threshold, and the charging current detecting unit 200 controls first metal-oxide-semiconductor Q1 breaks off, and stops battery charge.
The embodiment of the invention also provides a kind of charging circuit that comprises above-mentioned constant-current and constant-voltage control circuit.
The embodiment of the invention also provides a kind of charger that comprises above-mentioned charging circuit.
In embodiments of the present invention; This constant-current and constant-voltage control circuit adopts feedback arrangement, and the cell voltage according to detecting carries out constant current charge earlier to battery; Carry out constant voltage charge again; Adopt this structure, only there is a low-frequency pole in constant-current and constant-voltage control circuit from constant current charge to the transient process of constant voltage charge, has therefore improved the stability of transient process.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a constant-current and constant-voltage control circuit is characterized in that, said constant-current and constant-voltage control circuit comprises:
Input termination power, test side and output connect the constant current constant voltage control unit of battery respectively, are used to detect said cell voltage, when voltage does not reach voltage threshold, battery are carried out constant current charge, when voltage reaches voltage threshold, battery are carried out constant voltage charge;
Said constant current constant voltage control unit comprises:
Voltage control loop and current controlled circuit;
Said voltage control loop comprises switching device and voltage control circuit; The input termination power of said switching device; The output termination battery of said switching device, first end of the control termination voltage control circuit of said switching device, the second termination battery of said voltage control circuit;
The control end of the first termination switching device of said current controlled circuit, the second termination battery of said current controlled circuit;
Said switching device adopts first metal-oxide-semiconductor; The source electrode of said first metal-oxide-semiconductor connects power supply, and the drain electrode of said first metal-oxide-semiconductor connects battery, and said voltage control circuit comprises first resistance, second resistance, voltage amplifier and second metal-oxide-semiconductor; The drain electrode of said first metal-oxide-semiconductor of first termination of said first resistance; First end of said second resistance of second termination of said first resistance, the second end ground connection of said second resistance, the in-phase input end of said voltage amplifier connects reference voltage; The inverting input of said voltage amplifier connects second end of said first resistance; The grid of said second metal-oxide-semiconductor of output termination of said voltage amplifier, the source electrode of said second metal-oxide-semiconductor connects power supply, and the drain electrode of said second metal-oxide-semiconductor connects the grid of said first metal-oxide-semiconductor;
When cell voltage was low, said constant-current and constant-voltage control circuit was in the constant current charge process;
When the inverting input voltage of voltage amplifier during near reference voltage; Be that cell voltage reaches voltage threshold, the voltage amplifier output end voltage descends, the second metal-oxide-semiconductor conducting; At this moment; First metal-oxide-semiconductor, first resistance, second resistance, voltage amplifier and second metal-oxide-semiconductor constitute a LDO pressurizer, the output constant voltage, said constant-current and constant-voltage control circuit with constant voltage to battery charge.
2. constant-current and constant-voltage control circuit as claimed in claim 1; It is characterized in that; Said current controlled circuit comprises the 3rd metal-oxide-semiconductor, the 4th metal-oxide-semiconductor, current amplifier and the 3rd resistance; The inverting input of said current amplifier connects battery eliminator voltage, and the in-phase input end of said current amplifier connects the drain electrode of first end and the 3rd metal-oxide-semiconductor of the 3rd resistance, and the source electrode of said the 3rd metal-oxide-semiconductor connects the drain electrode of the 4th metal-oxide-semiconductor; The source electrode of said the 4th metal-oxide-semiconductor connects power supply, and the grid of said the 4th metal-oxide-semiconductor connects the output of said current amplifier.
3. constant-current and constant-voltage control circuit as claimed in claim 2 is characterized in that, said constant-current and constant-voltage control circuit also comprises:
Input termination battery, the control end of the switching device of the said constant current constant voltage control unit of output termination reaches current threshold if detect the charging current of said battery, controls the charging current detecting unit that said constant current constant voltage control unit stops to charge to battery.
4. constant-current and constant-voltage control circuit as claimed in claim 3; It is characterized in that said charging current detecting unit comprises the 3rd metal-oxide-semiconductor, the 4th metal-oxide-semiconductor, adapter amplifier and the 3rd resistance, the source electrode of said the 4th metal-oxide-semiconductor connects power supply; The grid of said the 4th metal-oxide-semiconductor connects the grid of first metal-oxide-semiconductor; The drain electrode of said the 4th metal-oxide-semiconductor connects the inverting input of adapter amplifier and the source electrode of the 3rd metal-oxide-semiconductor, and the in-phase input end of said adapter amplifier connects battery, the grid of output termination the 3rd metal-oxide-semiconductor of said adapter amplifier; The drain electrode of said the 3rd metal-oxide-semiconductor connects first end of the 3rd resistance, the second end ground connection of said the 3rd resistance.
5. a charging circuit is characterized in that, said charging circuit comprises each described constant-current and constant-voltage control circuit like claim 1-4.
6. a charger is characterized in that, said charger comprises charging circuit as claimed in claim 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2010101483538A CN101814756B (en) | 2010-04-12 | 2010-04-12 | Constant-current and constant-voltage control circuit, charging circuit and charger |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101483538A CN101814756B (en) | 2010-04-12 | 2010-04-12 | Constant-current and constant-voltage control circuit, charging circuit and charger |
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| CN101814756A CN101814756A (en) | 2010-08-25 |
| CN101814756B true CN101814756B (en) | 2012-05-30 |
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Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101931255B (en) * | 2010-09-29 | 2012-09-26 | 无锡中星微电子有限公司 | Charging management circuit |
| CN102195321B (en) * | 2011-04-08 | 2013-08-14 | 昆山盛鸿信息科技有限公司 | Intelligent load distribution circuit of lithium battery power |
| CN102593904B (en) * | 2012-02-28 | 2013-09-04 | 湖南融和微电子有限公司 | Lithium battery linear-charging device |
| CN103887831B (en) * | 2012-12-19 | 2016-03-09 | 远翔科技股份有限公司 | Current adjusting system |
| CN103384074B (en) * | 2013-06-28 | 2015-06-24 | 江苏玖宇实业有限公司 | Battery charger controlling circuit |
| CN103457320B (en) * | 2013-08-22 | 2015-05-27 | 电子科技大学 | Lithium ion battery switch charging circuit |
| CN103594117B (en) * | 2013-11-21 | 2016-12-07 | 无锡中感微电子股份有限公司 | High-speed memory |
| CN104218646B (en) * | 2014-09-17 | 2016-03-09 | 南通钰泰电子科技有限公司 | A kind of portable power source charging circuit |
| CN106712130A (en) * | 2015-07-31 | 2017-05-24 | 苏州易能微电子科技有限公司 | Novel charging control system and method |
| CN106025409A (en) * | 2016-07-18 | 2016-10-12 | 上海学源电子科技有限公司 | Variable constant-current constant-voltage charging method |
| CN107769277B (en) * | 2016-08-15 | 2024-03-22 | 深圳市朗驰欣创科技股份有限公司 | Constant-current control charging system and method |
| CN108575030B (en) * | 2017-03-14 | 2020-05-12 | 上海巍立智能科技有限公司 | Portable lamp and control method thereof |
| CN111799497B (en) * | 2020-06-30 | 2022-04-15 | 欣旺达电子股份有限公司 | Battery formation system and battery formation method |
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2010
- 2010-04-12 CN CN2010101483538A patent/CN101814756B/en active Active
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| Chen Chen等.Chip Design of Li-Ion Battery Charger Operating in Constant-Current/Constant-Voltage Modes.《半导体学报》.2007,第28卷(第7期),第1030-1035页. * |
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