CN105337320A - Dynamic current charging method and circuit - Google Patents
Dynamic current charging method and circuit Download PDFInfo
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- CN105337320A CN105337320A CN201410309382.6A CN201410309382A CN105337320A CN 105337320 A CN105337320 A CN 105337320A CN 201410309382 A CN201410309382 A CN 201410309382A CN 105337320 A CN105337320 A CN 105337320A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention belongs to the electronic technical field and relates to a dynamic current charging method. The dynamic current charging method is applied to a transistor charging circuit. The dynamic current charging method includes a first stage and a second stage. According to the first stage, when battery voltage is lower than a first set threshold value, charging is performed with first preset charging current. According to the second stage, when the battery voltage is greater than or equal to the first set threshold value, charging is performed with second preset charging current larger than the first preset charging current, wherein the product of the first preset charging current or the second preset charging current and voltage drop at two ends of a transistor is a fixed value. According to the dynamic current charging method of the invention, charging current is dynamically adjusted according to battery voltage variation and battery temperature, so that charging time can be shortened, and high benefits can be obtained with minimal cost; and system instability caused by frequent adjustment of charging current and excessively long charging time caused by setting single charging current can be avoided. The dynamic current charging method is of great significance for terminal equipment requiring strict cost control.
Description
Technical field
The present invention relates to electronic technology field, be specifically related to a kind of dynamic current charging method.
Background technology
In various battery powered portable electric appts, extensively arrange charging circuit charge to battery, according to different design concepts and adopt the charging circuit of different chipset reality can be different, most triode charging circuit in prior art, whole charging process is charged with a constant electric current, cause the charging interval long, there is charge efficiency low, charging current is limited to the shortcoming of triode maximum power.And along with cell phone battery capacity increasing, mobile phone does thinner and thinner, all have very big requirement to charging interval and heating, and therefore release switching battery chargers (switchcharger) in prior art, efficiency improves greatly, but cost also corresponding raising.
Summary of the invention
The object of the invention is to, a kind of dynamic current charging method is provided, solves above technical problem;
The present invention also aims to, a kind of dynamic current charging circuit is provided, solves above technical problem.
Technical problem solved by the invention can realize by the following technical solutions:
A kind of dynamic current charging method, be applied to transistor charging circuit, wherein, charge step is as follows:
First stage: when cell voltage is lower than the first setting threshold, charge with the first preset charged electric current;
Second stage: when cell voltage is more than or equal to described first setting threshold, charges with the second preset charged electric current being greater than described first preset charged electric current;
The product of the pressure drop at described first preset charged electric current or described second preset charged electric current and described transistor two ends is a fixed value.
Preferably, when the temperature of described battery is greater than the first design temperature, the size of adjustment charging current is to described first preset charged electric current; When the temperature of described battery is greater than the second design temperature, stop charging.
Preferably, described fixed value is the maximum rated power of transistor, and the pressure drop at described transistor two ends is the difference of charging voltage and cell voltage.
Preferably, described fixed value is the value after the maximum rated power of transistor rounds, and the pressure drop at described transistor two ends is the difference of charging voltage and cell voltage.
Preferably, setting described cell voltage is a default starting voltage, by the pressure drop acquisition described first preset charged electric current of described fixed value divided by described transistor two ends.
Preferably, set described cell voltage and equal described first setting threshold, by the pressure drop acquisition described second preset charged electric current of described fixed value divided by described transistor two ends.
Preferably, described first design temperature is 42 DEG C, and/or described second design temperature is 50 DEG C.
The present invention also provides a kind of dynamic current charging circuit, adopts above-mentioned dynamic current charging method, comprising:
Charging transistor, is connected on the charge path between power end and cell input terminal to provide charging current;
Current regulation unit, connects the control end of described charging transistor, regulates the conducting state of described charging transistor to change the size of described charging current.
Preferably, also comprise a detection resistance, be series between described charging transistor and described cell input terminal, a current sense terminal draws the charging current for charge path of sampling from described detection resistance.
Preferably, also comprise battery voltage detection terminal, described battery voltage detection terminal is connected to described cell input terminal, for sampling to cell voltage by one second resistance.
beneficial effect: owing to adopting above technical scheme, the present invention accelerates the charging interval according to cell voltage change with battery temperature dynamic conditioning charging current, more efficient benefit is reached with minimum cost, both avoided repeatedly adjusting and caused system unstable, avoid again single setting charging current to cause the charging interval long, especially for the mobile terminal needing strictly to control cost as mobile phone there being very big meaning.
Accompanying drawing explanation
Fig. 1 is that at certain size battery 25 DEG C, capacity is the voltage electric quantity curve of 2100mAh (MAH);
Fig. 2 is charging circuit principle schematic of the present invention;
Fig. 3 is method flow diagram of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite of not making creative work, all belongs to the scope of protection of the invention.
It should be noted that, when not conflicting, the embodiment in the present invention and the feature in embodiment can combine mutually.
Below in conjunction with the drawings and specific embodiments, the invention will be further described, but not as limiting to the invention.
With reference to Fig. 1, Fig. 2, Fig. 3, the invention provides a kind of dynamic current charging method, be applied to transistor charging circuit, wherein, charge step is as follows:
First stage: when cell voltage is lower than the first setting threshold, charge with the first preset charged electric current;
Second stage: when cell voltage is more than or equal to the first setting threshold, charges with the second preset charged electric current being greater than the first preset charged electric current;
The product of the pressure drop at the first preset charged electric current or the second preset charged electric current and transistor two ends is a fixed value.
Because the computing formula of transistor power is: P=△ V*Ichg=(Vchg-VBAT) * Ichg, wherein, △ V is the pressure drop at transistor two ends, Ichg is charging current, Vchg is charging voltage, VBAT is cell voltage, in charging process, cell voltage VBAT can constantly change, when cell voltage VBAT increases because of charging, the pressure drop △ V at transistor two ends can decline, if whole charging process is charged with a constant electric current, can because the continuous decline of the pressure drop △ V at transistor two ends causes transistor power P to decrease, and then cause the charging interval long, if and maintenance transistor power is constant, then charging current Ichg can constantly increase, the continuous adjustment of charging current can cause the instability of system, cause the charging interval long and avoid not stopping to adjust charging current causing unstable problem in order to avoid setting single charging current, the present invention is by setting a threshold value for cell voltage VBAT, when cell voltage VBAT is lower than this first setting threshold, with the first preset charged current charges, when cell voltage VBAT is higher than this first setting threshold, to improve charging current, with the second preset charged current charges, the present invention can make system be in a comparatively high workload efficiency all the time, when not increasing cost, accelerate the charging interval, more efficient benefit is reached with minimum cost.
As a kind of preferred embodiment of the present invention, fixed value can be the maximum rated power of transistor, and the pressure drop at transistor two ends is the difference of charging voltage and cell voltage.
As a kind of preferred embodiment of the present invention, fixed value can be the value after the maximum rated power of transistor rounds, and the pressure drop at transistor two ends is the difference of charging voltage and cell voltage.
As a kind of preferred embodiment of the present invention, setting cell voltage is one when presetting starting voltage, obtains the first preset charged electric current by fixed value divided by the pressure drop at transistor two ends.Preferably, default starting voltage can be 3.2V.The minimum meeting of cell voltage drops to about 3.2V, is that 3.2V obtains the first preset charged electric current as electric current during start by default starting voltage.
As a kind of preferred embodiment of the present invention, setting cell voltage is when equaling the first setting threshold, obtains the second preset charged electric current by fixed value divided by the pressure drop at transistor two ends.Preferably, the first setting threshold can be 3.8V.
Cell voltage electric quantity curve according to Fig. 1 is known, the 80%-90% electricity of battery electric quantity is more than 3.7V at voltage, the charging circuit schematic diagram of composition graphs 2, charging power consumption mainly consumes on charging transistor, suppose that charging transistor maximum rated power is 1.2W, for made allowance calculates by reaching 1W during charging, namely fixed value gets 1W, default starting voltage gets 3.2V, as cell voltage=3.2V, can set charging current Ichg=P/ △ V=1w/ (5V-3.2V)=556mA, namely maximum setting charging current is 556mA; By 2000mAh calculation of capacity need charging interval=2000mAh/556mA=3.6h, according to cell voltage, increasing thus pressure drop △ V diminishes, for ensureing that triode is operated in fixed value 1W and suitably can improves charging current.
The present invention is in the first stage, and adopt charging current to be 556mA as cell voltage VBAT<3.8V, can ensure charging transistor operating power <1W, charging transistor is unlikely to produce too many heat because power consumption is excessive; In second stage, work as V
bAT>=3.8V, now charging current can be strengthened Ichg2=1w/ (5v-3.8v)=833mA by pressure drop △ V<=1.2V, according to the cell voltage electricity relation of lithium ion, battery is approximately 30% of total capacity at 3.2-3.8V capacity, i.e. charging interval T=T1+T2=2000mAh*30%/556mA+2000mAh* (1-30%)/833mA=1.08h+1.68h=2.76h; Can find out that, by optimization of the present invention, transistor charging circuit can accelerate the charging interval of 0.9 hour, actual charging process charging voltage Vchg is dragged down can be strengthened in 3.2V-3.8V stage charging current, and the charging interval can be made to be less than 2.5 hours.
As a kind of preferred embodiment of the present invention, in second stage process, when the temperature of battery is greater than the first design temperature, size to the first preset charged electric current of adjustment charging current; When the temperature of battery is greater than the second design temperature, stop charging.
Exception may be there is for charging process, be different from conventional design detection cell voltage temperature and be greater than the methods that 50 DEG C just stop charging, the present invention considers that mobile phone charging other operations simultaneously also may make battery overheated, increase according to battery temperature adjustment electric current, when detecting that battery temperature is greater than the first design temperature, as about 42 DEG C, illustrate and overheatedly immediately charging current is dropped to first these shelves of preset charged electric current, when battery temperature is greater than the second design temperature, as then stopped charging when about 52 DEG C, ensure charging safety.
The present invention also provides a kind of dynamic current charging circuit, wherein, adopts above-mentioned dynamic current charging method, comprising:
Charging transistor 11, is connected on the charge path between power end and cell input terminal to provide charging current;
Current regulation unit 12, connects the control end of charging transistor, regulates the conducting state of charging transistor to change the size of charging current under a control signal effect.
As a kind of preferred embodiment of the present invention; current regulation unit 12 can adopt a N-channel MOS pipe; wherein the source S of N-channel MOS pipe connects a driving voltage end VDRV; the drain D of N-channel MOS pipe connects the base stage of charging transistor 11; the grid G of N-channel MOS pipe connects a second source end VCHG1 by a resistance R1; a two-way voltage stabilizing didoe in parallel between the grid G and source S of N-channel MOS pipe, to realize voltage stabilizing and protective effect.
As a kind of preferred embodiment of the present invention, also comprise a detection resistance R3, be series between charging transistor 11 and cell input terminal VBAT, a current sense terminal ISENSE is from detecting the charging current of resistance R3 extraction for charge path of sampling.
As a kind of preferred embodiment of the present invention, also comprise battery voltage detection terminal VBAT_SENSE, battery voltage detection terminal VBAT_SENSE is connected to cell input terminal VBAT, for sampling to cell voltage by one second resistance R2.
The present invention resets a charging current according to charging transistor power in conjunction with cell voltage electric quantity curve when cell voltage is higher, when not increasing cost and not improving circuit, the method of dynamic conditioning charging current improves charging current, accelerate the charging interval, reach more efficient benefit with minimum cost.
The device that the present invention comprises can adjust according to actual needs flexibly.
The foregoing is only preferred embodiment of the present invention; not thereby embodiments of the present invention and protection range is limited; to those skilled in the art; should recognize and all should be included in the scheme that equivalent replacement done by all utilizations specification of the present invention and diagramatic content and apparent change obtain in protection scope of the present invention.
Claims (10)
1. a dynamic current charging method, be applied to transistor charging circuit, it is characterized in that, charge step is as follows:
First stage: when cell voltage is lower than the first setting threshold, charge with the first preset charged electric current;
Second stage: when cell voltage is more than or equal to described first setting threshold, charges with the second preset charged electric current being greater than described first preset charged electric current;
The product of the pressure drop at described first preset charged electric current or described second preset charged electric current and described transistor two ends is a fixed value.
2. a kind of dynamic current charging method according to claim 1, is characterized in that, when the temperature of described battery is greater than the first design temperature, the size of adjustment charging current is to described first preset charged electric current; When the temperature of described battery is greater than the second design temperature, stop charging.
3. a kind of dynamic current charging method according to claim 1, is characterized in that, described fixed value is the maximum rated power of transistor, and the pressure drop at described transistor two ends is the difference of charging voltage and cell voltage.
4. a kind of dynamic current charging method according to claim 1, is characterized in that, described fixed value is the value after the maximum rated power of transistor rounds, and the pressure drop at described transistor two ends is the difference of charging voltage and cell voltage.
5. a kind of dynamic current charging method according to claim 1, is characterized in that, setting described cell voltage is a default starting voltage, by the pressure drop acquisition described first preset charged electric current of described fixed value divided by described transistor two ends.
6. a kind of dynamic current charging method according to claim 1, is characterized in that, sets described cell voltage and equals described first setting threshold, by the pressure drop acquisition described second preset charged electric current of described fixed value divided by described transistor two ends.
7. a kind of dynamic current charging method according to claim 2, is characterized in that, described first design temperature is 42 DEG C, and/or described second design temperature is 50 DEG C.
8. a dynamic current charging circuit, is characterized in that, adopts dynamic current charging method according to claim 1, comprising:
Charging transistor, is connected on the charge path between power end and cell input terminal to provide charging current;
Current regulation unit, connects the control end of described charging transistor, regulates the conducting state of described charging transistor to change the size of described charging current.
9. a kind of dynamic current charging circuit according to claim 8, it is characterized in that, also comprise a detection resistance, be series between described charging transistor and described cell input terminal, a current sense terminal draws the charging current for charge path of sampling from described detection resistance.
10. a kind of dynamic current charging circuit according to claim 8, is characterized in that, also comprise battery voltage detection terminal, and described battery voltage detection terminal is connected to described cell input terminal, for sampling to cell voltage by one second resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410309382.6A CN105337320A (en) | 2014-06-30 | 2014-06-30 | Dynamic current charging method and circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410309382.6A CN105337320A (en) | 2014-06-30 | 2014-06-30 | Dynamic current charging method and circuit |
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| CN105337320A true CN105337320A (en) | 2016-02-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410309382.6A Pending CN105337320A (en) | 2014-06-30 | 2014-06-30 | Dynamic current charging method and circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107332316A (en) * | 2017-08-23 | 2017-11-07 | 努比亚技术有限公司 | Staged charging method, mobile terminal and computer-readable recording medium |
| CN109474037A (en) * | 2018-12-07 | 2019-03-15 | 成都芯源系统有限公司 | Battery charging circuit and control method thereof |
| CN113346580A (en) * | 2021-05-28 | 2021-09-03 | 上海广为美线电源电器有限公司 | Reverse charging control system and method for emergency starting power supply |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120286722A1 (en) * | 2011-05-12 | 2012-11-15 | Fdk Twicell Co., Ltd. | Charger |
| CN102931693A (en) * | 2011-08-10 | 2013-02-13 | 联发科技（新加坡）私人有限公司 | Battery charging control method and device and charging system and portable device. |
| CN103384071A (en) * | 2012-05-02 | 2013-11-06 | 纬创资通股份有限公司 | Battery charging circuit |
-
2014
- 2014-06-30 CN CN201410309382.6A patent/CN105337320A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120286722A1 (en) * | 2011-05-12 | 2012-11-15 | Fdk Twicell Co., Ltd. | Charger |
| CN102931693A (en) * | 2011-08-10 | 2013-02-13 | 联发科技（新加坡）私人有限公司 | Battery charging control method and device and charging system and portable device. |
| CN103384071A (en) * | 2012-05-02 | 2013-11-06 | 纬创资通股份有限公司 | Battery charging circuit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107332316A (en) * | 2017-08-23 | 2017-11-07 | 努比亚技术有限公司 | Staged charging method, mobile terminal and computer-readable recording medium |
| CN109474037A (en) * | 2018-12-07 | 2019-03-15 | 成都芯源系统有限公司 | Battery charging circuit and control method thereof |
| CN113346580A (en) * | 2021-05-28 | 2021-09-03 | 上海广为美线电源电器有限公司 | Reverse charging control system and method for emergency starting power supply |
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Application publication date: 20160217 |
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