CN103595098A - Charging control circuit of battery - Google Patents
Charging control circuit of battery Download PDFInfo
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- CN103595098A CN103595098A CN201310582607.0A CN201310582607A CN103595098A CN 103595098 A CN103595098 A CN 103595098A CN 201310582607 A CN201310582607 A CN 201310582607A CN 103595098 A CN103595098 A CN 103595098A
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Abstract
The invention discloses a charging control circuit of a battery. The charging control circuit of the battery comprises a voltage division circuit, an operation amplification circuit and a current adjustment circuit, wherein the voltage division circuit is suitable for conducting voltage division processing on an input voltage so as to output a voltage-divided voltage, the operation amplification circuit is suitable for outputting a compensating current through the output end of the operation amplification circuit when a voltage value of the voltage-divided voltage is smaller than a voltage value of a first reference voltage, and the current adjustment circuit is suitable for reducing a current value of a charging current of the battery according to the compensating current. According to the charging control circuit of the battery, when an adaptor can not provide a default charging current of the battery for an electronic device, the compensating current is generated, so that the current value of the charging current of the battery is reduced, the charging control circuit continuously and normally works, and the driving capacity of the adaptor is developed to the maximum extent.
Description
Technical field
The present invention relates to a kind of charging control circuit of battery.
Background technology
Rechargeable battery is the limited chargeable battery of charging times, has the advantages such as economy and environmental protection.The principal element that affects rechargeable battery cycle life is charging modes and the charge efficiency of rechargeable battery.Therefore,, when portable type electronic product develops to higher level integrated level, how for providing the charging scheme of highly effective and safe, rechargeable battery more and more to receive designer's concern.The advantages such as the efficient height of switching mode Charge Management controling appliance, volume is little, charging current is large, are used widely in fields such as smart mobile phone, panel computers.
Distinct electronic apparatuses may be different to the acquiescence charging current of rechargeable battery, and the output current of different adapters may be also different.Use the electronic equipment of rechargeable battery to be conventionally provided with charging control circuit, but, when the output current of used adapter is less than the acquiescence charging current of electronic equipment to battery, when adapter cannot provide the acquiescence charging current of electronic equipment to battery, the output voltage of adapter can reduce, when the output voltage of adapter is reduced to certain threshold value, charging control circuit cannot work on.
Summary of the invention
The problem that the present invention solves is the adapter problem that charging control circuit cannot work on when the acquiescence charging current of electronic equipment to battery cannot be provided.
For addressing the above problem, the invention provides a kind of charging control circuit of battery, comprising:
Bleeder circuit, is suitable for input voltage to carry out voltage division processing with output branch pressure voltage;
Operational amplification circuit, when being suitable for magnitude of voltage at described branch pressure voltage and being less than the magnitude of voltage of the first reference voltage by the output output offset current of described operational amplification circuit;
Current regulating circuit, is suitable for reducing according to described offset current the current value of the charging current of described battery.
Compared with prior art, the charging control circuit of battery of the present invention can produce offset current when adapter cannot provide the acquiescence charging current of electronic equipment to battery, the current value of the charging current of battery is reduced, to guarantee that charging control circuit can continue normal operation.
Accompanying drawing explanation
Fig. 1 is a structural representation of the charging control circuit of the battery that provides of the embodiment of the present invention;
Fig. 2 is the structural representation of the operational amplifier that provides of the embodiment of the present invention;
Fig. 3 is another structural representation of the charging control circuit of the battery that provides of the embodiment of the present invention.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can more be become apparent, below in conjunction with accompanying drawing, specific embodiments of the invention are described in detail.
As shown in Figure 1, the embodiment of the present invention provides a kind of charging control circuit of battery, comprising: bleeder circuit 1, operational amplification circuit 2 and current regulating circuit 3.
Bleeder circuit 1 is suitable for input voltage Vbus to carry out voltage division processing with output branch pressure voltage.When the magnitude of voltage of described branch pressure voltage is less than the magnitude of voltage of the first reference voltage V ref1 by the output output offset current I1 of operational amplification circuit 2.Current regulating circuit 3 is suitable for reducing according to offset current I1 the current value of the charging current I2 of battery.
The charging control circuit that the present embodiment provides, can set the magnitude of voltage of the first reference voltage V ref1 according to actual needs.When adapter cannot provide the acquiescence charging current of electronic equipment to battery, the meeting of the output voltage of adapter reduces, and the input voltage Vbus of charging control circuit can reduce.When the magnitude of voltage of input voltage Vbus after bleeder circuit drops to the magnitude of voltage that is less than the first reference voltage V ref1, operational amplification circuit 2 can be exported offset current I1, the voltage that can maintain error amplifier EA first input end and the second input due to constant current loop equates, so sample rate current Isense can reduce, because battery charge I2 and sample rate current Isense meet certain proportionate relationship, and then the current value of the charging current I2 of battery can reduce, thereby prevent input voltage Vbus from continuing to reduce and reach balance, make charging control circuit can continue normal operation and also bring into play to greatest extent the driving force of adapter.The charging control circuit that the present embodiment provides can the less adapter of Adaptive matching power output.
In the present embodiment, bleeder circuit 1 can comprise: the first divider resistance R11 and the second divider resistance R12.The first end of the first divider resistance R11 is suitable for inputting described input voltage Vbus, and the second end of the first divider resistance R11 connects the first end of the second divider resistance R12 and is suitable for exporting described branch pressure voltage, the second end ground connection of the second divider resistance R12.Described bleeder circuit 1 also can adopt other existing bleeder circuits, does not limit herein.
Operational amplification circuit 2 can comprise: operational amplifier 21 and the 4th PMOS pipe MP4.
The first input end of operational amplifier 21 is suitable for inputting described the first reference voltage V ref1.The second input of operational amplifier 21 is suitable for inputting the branch pressure voltage of bleeder circuit 1 output.The output of operational amplifier 21 connects the grid of the 4th PMOS pipe MP4.The source electrode of the 4th PMOS pipe MP4 is suitable for input supply voltage VCC.The drain electrode of the 4th PMOS pipe MP4 is as the output of operational amplification circuit 2.
As shown in Figure 2, operational amplifier 21 can comprise: the 5th PMOS pipe MP5, the 6th PMOS pipe MP6, the 7th PMOS pipe MP7, the 3rd NMOS pipe MN3, the 4th NMOS pipe MN4 and the 3rd current source circuit 211.
The source electrode of the 5th PMOS pipe MP5 is suitable for input supply voltage VCC, and the grid of the 5th PMOS pipe MP5 connects the drain electrode of the drain electrode of the 5th PMOS pipe MP5, the grid of the 6th PMOS pipe MP6 and the 3rd NMOS pipe MN3.The source electrode of the 3rd NMOS pipe MN3 connects the 4th NMOS pipe source electrode of MN4 and the input of the 3rd current source circuit 211.The grid of the 3rd NMOS pipe MN3, as the second input of operational amplifier 21, is suitable for inputting branch pressure voltage.The source electrode of the 6th PMOS pipe MP6 is suitable for input supply voltage VCC, and the drain electrode of the 6th PMOS pipe MP6 connects the grid of the 7th PMOS pipe MP7, the drain electrode of the drain electrode of the 7th PMOS pipe MP7 and the 4th NMOS pipe MN4 as the output of operational amplifier 21.The grid of the 4th NMOS pipe MN4, as the first input end of operational amplifier 21, is suitable for inputting the first reference voltage V ref1.The source electrode of the 7th PMOS pipe MP7 is suitable for input supply voltage VCC.The output head grounding of the 3rd current source circuit 211.
Operational amplifier 21 gains shown in Fig. 2 are less than or equal to 30dB, and such loop easily compensates, difficult vibration.
With respect to common operational amplifier, the 7th PMOS pipe MP7 has reduced the gain of operational amplifier, and voltage amplifier design is become to electric current operational transconductance amplifier.
Current regulation unit 3 can comprise: current sampling circuit 31, voltage translated resistance R32 and drive circuit 33.
Current sampling circuit 31 is suitable for sampling the charging current I2 of described battery to produce sample rate current Isense and by the output output sample rate current Isense of current sampling circuit 31.The first end of voltage translated resistance R32 connects the output of current sampling circuit 31 and the output of operational amplification circuit 2.The second end ground connection of voltage translated resistance R32.The input of drive circuit 33 connects the output of described current sampling circuit 31 and the output of operational amplification circuit 2, and the output of drive circuit 33 is suitable for exporting the charging current I2 of battery.
When adapter can provide the acquiescence charging current of electronic equipment to battery, operational amplification circuit 2 can not produce offset current I1, the first end of voltage translated resistance R32 input sample electric current I sense only; When adapter cannot provide the acquiescence charging current of electronic equipment to battery, operational amplification circuit 2 produces offset current I1, first end input sample electric current I sense and the offset current I1 of voltage translated resistance R32.
Current sampling circuit 31 can comprise: the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the first current mirroring circuit 311, the first current source circuit 312, the second current source circuit 313 and PMOS pipe MP1.
The first end of the first resistance R 1 connects the first end of the second resistance R 2 and the output of drive circuit 33, and the second end of the first resistance R 1 connects first end and the battery of the 3rd resistance R 3.The first input end of the first current mirroring circuit 311 connects the second end of the second resistance R 2 and the source electrode of PMOS pipe MP1, the second input connects the second end of the 3rd resistance R 3, the first output is by the first current source circuit 312 ground connection, and the second output connects the grid of a PMOS pipe MP1 and passes through the second current source circuit 313 ground connection.The drain electrode of the one PMOS pipe MP1 is as the output of current sampling circuit 31.
The first current mirroring circuit 311 can comprise: the 2nd PMOS pipe MP2 and the 3rd PMOS pipe MP3.The source electrode of the 2nd PMOS pipe MP2 is as the first input end of the first current mirroring circuit 311.The grid of the 2nd PMOS pipe MP2 connects the grid of the 3rd PMOS pipe MP3 and the drain electrode of the 2nd PMOS pipe MP2 and as the first output of the first current mirroring circuit 311.The source electrode of the 3rd PMOS pipe MP3 is as the second input of the first current mirroring circuit 311.The drain electrode of the 3rd PMOS pipe MP3 is as the second output of the first current mirroring circuit 311.Described the first current mirroring circuit 311 also can adopt other existing current mirroring circuits, does not limit herein.
The resistance value of the second resistance R 2 and the 3rd resistance R 3 equates, i1=r1 * i2 ÷ r2, and wherein, i1 is the current value of sample rate current Isense, and i2 is the current value of charging current I2, and r1 is the resistance value of the first resistance R 1, and r2 is the resistance value of the second resistance R 2.
Drive circuit 33 can comprise: error amplifier EA, PWM controller 331, driver 332, a NMOS pipe MN1, the 2nd NMOS pipe MN2 and the first inductance L 1.
The first input end of error amplifier EA is suitable for inputting the second reference voltage V ref2.The second input of error amplifier EA connects the output of current sampling circuit 31 and the output of operational amplification circuit 2.The output of error amplifier EA connects the input of PWM controller 331.The output of PWM controller 331 connects the input of driver 332.The output of driver 332 connects the grid of a NMOS pipe MN1 and the grid of the 2nd NMOS pipe MN2.The source electrode of the one NMOS pipe MN1 connects the 2nd NMOS pipe drain electrode of MN2 and the first end of the first inductance L 1.The source ground of the 2nd NMOS pipe MN2, the second end of the first inductance L 1 is as the output of drive circuit 33.
The one NMOS pipe MN1, the 2nd NMOS pipe MN2 and the first inductance L 1 form power stage circuit, and error amplifier EA, PWM controller 331 and driver 332 form Drive and Control Circuit, the charging current that described Drive and Control Circuit can the output of regulating power level circuit.Those skilled in the art can know the course of work and the operation principle of drive circuit 33, repeat no more herein.Drive circuit 33 described in the present embodiment also can adopt the drive circuit of other existing battery chargings to realize.
When adapter cannot provide the acquiescence charging current of electronic equipment to battery, operational amplification circuit 2 produces offset current I1, the sample rate current Isense of the second input input of error amplifier EA and the voltage Vsense that offset current I1 obtains through overvoltage translated resistance R32, at this moment the magnitude of voltage of voltage Vsense is greater than the magnitude of voltage of the second reference voltage V ref2, the output end voltage of error amplifier EA declines, by adjusting duty ratio, the charging current I2 of drive circuit 33 outputs is reduced.After this adjusting by loop self reaches balance, the voltage Vsense of the second input of steady state error amplifier EA and the magnitude of voltage of the second reference voltage V ref2 equate, now charging current I2 no longer reduces, input supply voltage VBUS also no longer reduces, thereby the maximum drive ability place that is stabilized in adapter completes charging.
It should be noted that, current sampling circuit 31 is very little on the size impact of the charging current I2 of drive circuit 33 outputs, i.e. the size of the charging current I2 of drive circuit 33 outputs equates substantially with the size of the electric current of the second end output of the first resistance R 1 in current sampling circuit 31.
As shown in Figure 3, the charging control circuit of the battery of the present embodiment can also comprise: the first capacitor C 1.The first end of the first capacitor C 1 is suitable for inputting described branch pressure voltage, the second end ground connection.The first capacitor C 1 can realize filter function
The charging control circuit of the battery of the present embodiment can also comprise: the second capacitor C 2.The output of the first end concatenation operation amplifying circuit 2 of the second capacitor C 2, the second end ground connection.The second capacitor C 2 can be used as the effect of loop compensation.
Although the present invention discloses as above, the present invention is not defined in this.Any those skilled in the art, without departing from the spirit and scope of the present invention, all can make various changes or modifications, so protection scope of the present invention should be as the criterion with claim limited range.
Claims (10)
1. a charging control circuit for battery, is characterized in that, comprising:
Bleeder circuit, is suitable for input voltage to carry out voltage division processing with output branch pressure voltage;
Operational amplification circuit, when being suitable for magnitude of voltage at described branch pressure voltage and being less than the magnitude of voltage of the first reference voltage by the output output offset current of described operational amplification circuit;
Current regulating circuit, is suitable for reducing according to described offset current the current value of the charging current of described battery.
2. the charging control circuit of battery as claimed in claim 1, is characterized in that, described current regulation unit comprises: current sampling circuit, voltage translated resistance and drive circuit;
Described current sampling circuit is suitable for sampling the charging current of described battery to produce sample rate current and to export described sample rate current by the output of described current sampling circuit;
The first end of described voltage translated resistance connects the output of described current sampling circuit and the output of operational amplification circuit, the second end ground connection of described voltage translated resistance;
The input of described drive circuit connects the output of described current sampling circuit and the output of operational amplification circuit, and the output of described drive circuit is suitable for exporting the charging current of described battery.
3. the charging control circuit of battery as claimed in claim 2, it is characterized in that, described current sampling circuit comprises: the first resistance, the second resistance, the 3rd resistance, the first current mirroring circuit, the first current source circuit, the second current source circuit and PMOS pipe;
The first end of described the first resistance connects the first end of described the second resistance, and the second end of described the first resistance connects the first end of described the 3rd resistance and is suitable for exporting the charging current of described battery;
The first input end of described the first current mirroring circuit connects the second end of described the second resistance and the source electrode of a described PMOS pipe, described the second input connects the second end of described the 3rd resistance, the first output is by described the first current source circuit ground connection, and the second output connects the grid of a described PMOS pipe and passes through described the second current source circuit ground connection;
The drain electrode of a described PMOS pipe is as the output of described current sampling circuit.
4. the charging control circuit of battery as claimed in claim 3, it is characterized in that, described the first current source circuit comprises: the 2nd PMOS pipe and the 3rd PMOS pipe, the source electrode of described the 2nd PMOS pipe is as the first input end of described the first current mirroring circuit, the grid of described the 2nd PMOS pipe connects the grid of described the 3rd PMOS pipe and the drain electrode of the 2nd PMOS pipe and as the first output of described the first current mirroring circuit, the source electrode of described the 3rd PMOS pipe is as the second input of described the first current mirroring circuit, the drain electrode of described the 3rd PMOS pipe is as the second output of described the first current mirroring circuit.
5. the charging control circuit of battery as claimed in claim 2, it is characterized in that, described drive circuit comprises: error amplifier, PWM controller, driver, the one NMOS pipe, the 2nd NMOS pipe and the first inductance, the first input end of described error amplifier is suitable for inputting the second reference voltage, the second input of described error amplifier connects the output of described current sampling circuit and the output of operational amplification circuit, the output of described error amplifier connects the input of PWM controller, the output of described PWM controller connects the input of described driver, the output of described driver connects the grid of described the 2nd NMOS pipe and the grid of the 2nd NMOS pipe, the source electrode of a described NMOS pipe connects the drain electrode of the 2nd NMOS pipe and the first end of the first inductance, the source ground of described the 2nd NMOS pipe, the second end of described the first inductance is as the output of described drive circuit.
6. the charging control circuit of battery as claimed in claim 1, it is characterized in that, described bleeder circuit comprises: the first divider resistance and the second divider resistance, the first end of described the first divider resistance is suitable for inputting described input voltage, the second end of described the first divider resistance connects the first end of the second divider resistance and is suitable for exporting described branch pressure voltage, the second end ground connection of described the second divider resistance.
7. the charging control circuit of battery as claimed in claim 1, is characterized in that, also comprises: the second electric capacity, the first end of described the second electric capacity connects the output of described operational amplification circuit, the second end ground connection of described the second electric capacity.
8. the charging control circuit of battery as claimed in claim 1, it is characterized in that, described operational amplification circuit comprises: operational amplifier and the 4th PMOS pipe, the first input end of described operational amplifier is suitable for inputting described the first reference voltage, the second input of described operational amplifier is suitable for inputting described branch pressure voltage, the output of described operational amplifier connects the grid of described the 4th PMOS pipe, the source electrode of described the 4th PMOS pipe is suitable for input supply voltage, and the drain electrode of described the 4th PMOS pipe is as the output of described operational amplification circuit.
9. the charging control circuit of battery as claimed in claim 8, is characterized in that, the gain of described operation amplifier electrical equipment is less than or equal to 30dB.
10. the charging control circuit of battery as claimed in claim 8, is characterized in that, described operation amplifier electrical equipment comprises: the 5th PMOS pipe, the 6th PMOS pipe, the 7th PMOS pipe, the 3rd NMOS pipe, the 4th NMOS pipe and the 3rd current source circuit;
The source electrode of described the 5th PMOS pipe is suitable for inputting described supply voltage, the grid of described the 5th PMOS pipe connects the drain electrode of described the 5th PMOS pipe, the drain electrode of the grid of the 6th PMOS pipe and the 3rd NMOS pipe, the source electrode of described the 3rd NMOS pipe connects the source electrode of described the 4th NMOS pipe and the input of the 3rd current source circuit, the grid of described the 3rd NMOS pipe is as the second input of described operational amplifier, the source electrode of described the 6th PMOS pipe is suitable for inputting described supply voltage, the drain electrode of described the 6th PMOS pipe connects the grid of described the 7th PMOS pipe, the drain electrode of the drain electrode of the 7th PMOS pipe and the 4th NMOS pipe as the output of described operational amplifier, the grid of described the 4th NMOS pipe is as the first input end of described operational amplifier, the source electrode of described the 7th PMOS pipe is suitable for inputting described supply voltage VCC, the output head grounding of described the 3rd current source circuit.
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| CN201310582607.0A CN103595098B (en) | 2013-11-19 | 2013-11-19 | The charging control circuit of battery |
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| CN201310582607.0A CN103595098B (en) | 2013-11-19 | 2013-11-19 | The charging control circuit of battery |
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| CN103595098B CN103595098B (en) | 2015-09-09 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105932877A (en) * | 2016-06-28 | 2016-09-07 | 深圳市富满电子集团股份有限公司 | DC-DC converter |
| CN107482722A (en) * | 2017-08-25 | 2017-12-15 | 西安电子科技大学 | A kind of constant current charger circuit |
| CN108732411A (en) * | 2018-07-27 | 2018-11-02 | 上海艾为电子技术股份有限公司 | A kind of adaptively sampled circuit and its switched charge chip |
| CN108925008A (en) * | 2018-08-14 | 2018-11-30 | 上海艾为电子技术股份有限公司 | Driving method, driving circuit, compensation circuit and light adjusting system |
| CN110970967A (en) * | 2018-09-28 | 2020-04-07 | 佳能株式会社 | Electronic apparatus, control method, and storage medium |
| CN111463865A (en) * | 2020-04-30 | 2020-07-28 | 中国石油化工股份有限公司 | Constant voltage battery energy management module device |
| 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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2013
- 2013-11-19 CN CN201310582607.0A patent/CN103595098B/en active Active
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105932877A (en) * | 2016-06-28 | 2016-09-07 | 深圳市富满电子集团股份有限公司 | DC-DC converter |
| CN105932877B (en) * | 2016-06-28 | 2019-01-11 | 深圳市富满电子集团股份有限公司 | A kind of DC-DC converter |
| CN107482722A (en) * | 2017-08-25 | 2017-12-15 | 西安电子科技大学 | A kind of constant current charger circuit |
| CN107482722B (en) * | 2017-08-25 | 2020-06-30 | 西安电子科技大学 | Constant current charger circuit |
| CN108732411A (en) * | 2018-07-27 | 2018-11-02 | 上海艾为电子技术股份有限公司 | A kind of adaptively sampled circuit and its switched charge chip |
| CN108732411B (en) * | 2018-07-27 | 2023-10-27 | 上海艾为电子技术股份有限公司 | Self-adaptive sampling circuit and switch charging chip thereof |
| CN108925008A (en) * | 2018-08-14 | 2018-11-30 | 上海艾为电子技术股份有限公司 | Driving method, driving circuit, compensation circuit and light adjusting system |
| CN110970967A (en) * | 2018-09-28 | 2020-04-07 | 佳能株式会社 | Electronic apparatus, control method, and storage medium |
| 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 |
| CN111463855B (en) * | 2020-04-02 | 2022-04-29 | 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 |
| CN111463865A (en) * | 2020-04-30 | 2020-07-28 | 中国石油化工股份有限公司 | Constant voltage battery energy management module device |
| CN111463865B (en) * | 2020-04-30 | 2021-10-22 | 中国石油化工股份有限公司 | Constant voltage battery energy management module device |
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| CN103595098B (en) | 2015-09-09 |
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