CN203180580U - An intelligent lithium ion charger - Google Patents
An intelligent lithium ion charger Download PDFInfo
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- CN203180580U CN203180580U CN 201320143884 CN201320143884U CN203180580U CN 203180580 U CN203180580 U CN 203180580U CN 201320143884 CN201320143884 CN 201320143884 CN 201320143884 U CN201320143884 U CN 201320143884U CN 203180580 U CN203180580 U CN 203180580U
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- battery
- lithium ion
- circuit
- oscillator
- reference module
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Abstract
The utility model relates to charger circuit technical field and specifically relates to an intelligent lithium ion charger. The intelligent lithium ion charger comprises a battery charging management chip, a voltage reference module, a current reference module, a battery voltage detecting circuit, a battery temperature detecting circuit, a first oscillator, and a second oscillator. The voltage reference module, the current reference module, the battery voltage detecting circuit, the battery temperature detecting circuit, the first oscillator, and the second oscillator are all connected with the battery charging management chip.
Description
Technical field
The utility model relates to the charger circuit technical field, is specifically related to intelligent lithium ion charger.
Background technology
In the prior art, the lithium ion charger is widely used in the portable type electronic products such as digital camera, mobile phone.But because existing lithium ion charger is not with functions such as under-voltage/overvoltage protection, safe charging time, battery short circuit/overvoltage protection; make the lithium ion charger in charging process, can not detect the state information of charging automatically and accurately; make corresponding adjustment timely; thereby reduced serviceability, reduction of service life.
Summary of the invention
The purpose of this utility model provides a kind of intelligent lithium ion charger that can detect the state information of charging automatically and accurately and have defencive functions such as under-voltage, overvoltage.
In order to solve the existing problem of background technology, the utility model is by the following technical solutions: intelligent lithium ion charger, comprise battery charging management chip, voltage reference module, current reference module, battery voltage detection circuit, battery temperature testing circuit, first oscillator and second oscillator, described voltage reference module, current reference module, battery voltage detection circuit, battery temperature testing circuit, first oscillator and second oscillator are connected with described battery charging management chip respectively.
Further, described intelligent lithium ion charger also comprises thermal-shutdown circuit, and described thermal-shutdown circuit is connected with described battery charging management chip.
Further, described intelligent lithium ion charger also comprises hot modulation circuit, and described hot modulation circuit is connected with described battery charging management chip.
The utlity model has following beneficial effect: intelligent lithium ion charger described in the utility model; carry out defencive functions such as under-voltage, overvoltage, excess temperature when adopting battery voltage detection circuit, battery temperature testing circuit, thermal-shutdown circuit and hot modulation circuit etc. that the lithium ion charger is charged; and can detect the state information of charging automatically and accurately; in time make corresponding adjustment; thereby improved the charger serviceability, increased the service life.
Description of drawings
Fig. 1 is structural representation of the present utility model.
The schematic diagram that Fig. 2 uses for the utility model.
Embodiment
The utility model is described in more detail below in conjunction with accompanying drawing.
As shown in Figure 1, intelligent lithium ion charger, comprise battery charging management chip 1, voltage reference module 2, current reference module 3, battery voltage detection circuit 4, battery temperature testing circuit 5, first oscillator 6 and second oscillator 7, described voltage reference module 2, current reference module 3, battery voltage detection circuit 4, battery temperature testing circuit 5, first oscillator 6 and second oscillator 7 are connected with described battery charging management chip 1 respectively; Wherein, voltage reference module and current reference module are used for providing reference voltage and benchmark and bias current to other modular circuits; Battery voltage detection circuit is used for battery short circuit and battery overvoltage detection, pre-charge state switching, recharge and battery and inserts measuring ability etc.; The battery temperature testing circuit is used for the monitoring battery temperature, and the output control signal is adjusted charged state, to satisfy the JEITA temperature standard; First oscillator is used for the full charging interval timing in Chang'an, and frequency of oscillation can be passed through resistance adjustment; Second oscillator is used for that inner protection against noise is required latchs the time timing.
Described intelligent lithium ion charger also comprises thermal-shutdown circuit 8, and described thermal-shutdown circuit 8 is connected with described battery charging management chip 1; Thermal-shutdown circuit, when too high for chip temperature, breaking circuit stops charging.
Described intelligent lithium ion charger also comprises hot modulation circuit 9, described hot modulation circuit 9 is connected with described battery charging management chip 1, and hot modulation circuit is used for reducing when chip temperature raises charging current, reduce chip temperature, make chip temperature maintain set refining temperature.
As shown in Figure 2, the workflow of intelligent lithium ion charger is: after powering on, chip at first begins to detect supply voltage VCC, if 3.3V≤VCC≤6V, and VCC〉VBAT shows that supply voltage is in normal working range; If VCC＜3.3V shows that power supply is in under-voltage condition, comprise that the circuit main modular of benchmark is not all worked; If VCC〉6V, show the input overvoltage, stop charging, but the circuit main modular is worked all; If VCC＜VBAT, at this moment export a SLEEP signal, control comprises that the main modular of benchmark do not work, entire circuit enters the low-power consumption park mode.
If supply voltage is in the normal range of operation, then carrying out battery detecting and battery initial temperature detects, usually lithium ion battery has 3 contact jaws: positive pole, negative pole and NTC resistance, consider when actual battery inserts, might there be an end not connect, therefore surface analysis is independently considered battery and NTC resistance down: output is connected to battery and battery temperature is normal if detect, and then can enter the charging link, and the LED on the STAT1 is bright; If detect that output is connected to battery and the battery initial temperature is unusual, then can not charge and STAT1 on LED with the 2.5Hz frequency scintillation; Do not connect battery if detect output, and NTC resistance do not exist yet, then output end voltage is pulled to 0V; Do not connect battery if detect output, and NTC connects and temperature is normal, then continue battery detecting, insert or the access of NTC resistance up to battery.
Judge that battery inserts, and the NTC temperature normal after, if cell voltage VBAT＜0.5V judges battery short circuit, with the current activation battery of 20mA, the LED on the STAT1 is with the 2.5Hz frequency scintillation simultaneously; If cell voltage 0.5V＜VBAT＜3V is judged as the overdischarge battery, precharge is handled, charging current and the proportional relation of constant current charge electric current, and by the connecting resistance decision of PRETERM end institute, be generally 20% constant current charge electric current; If cell voltage VBAT〉3V, constant current charge, charging current determines that by ISET end resistance sizes charge normal in the process, the LED on the STAT1 is bright.
When cell voltage during near 4.215V, be converted to constant voltage mode, charging current reduces, when if charging current is reduced to the pre-charge current of setting, be judged as battery and be full of, carry out battery detecting simultaneously, if battery still exists, then the LED on the STAT1 extinguishes, and the LED on the STAT2 is bright; If detect battery do not exist this moment, and NTC resistance also and temperature normal, then continue battery detecting; If NTC resistance does not also exist, then output end voltage is pulled to 0V.After being full of electricity, stop charging, the LED on the STAT1 extinguishes, and the LED on the STAT2 is bright.If cell voltage is down to below the 4.1V, then chip restarts automatically to battery charge.
In some abnormal conditions, if cell voltage rises to about 4.4V, and charging does not also stop, and then is judged as the battery overvoltage, stop charging, and the LED on the STAT1 is with the 2.5Hz frequency scintillation; If cell voltage, is then thought battery short circuit suddenly from being down to more than the 3V below the 2.5V, charging current becomes 20mA, and the LED on the STAT1 is with the 2.5Hz frequency scintillation simultaneously.
The initial temperature scope of battery is-2 ℃ to 42 ℃, and the battery temperature scope is-2 ℃ to 57 ℃ in the charging process.If the temperature range of battery has surpassed-2 ℃ to 57 ℃, then stop charging, and the LED on the STAT1 extinguishes, when temperature returns in 0 ℃ to 40 ℃, just can restart charging; If the temperature of battery is higher than-2 ℃, but is lower than 9 ℃, then charging current reduces by half; If the temperature of battery is higher than 45 ℃, but less than 57 ℃, then constant voltage charge voltage becomes 4.1V.
From initial charge, the timer in the chip picks up counting, and the longest charging interval is able to programme.(RTMR=50k) in typical case for precharge, if in 60 minutes, is not charged to cell voltage more than the 3V, then thinks unusual, and the LED on the STAT1 is with the 2.5Hz frequency scintillation; For constant current charge, if in 300 minutes, battery also is not full of, and then thinks unusual, and the LED on the STAT1 is with the 2.5Hz frequency scintillation.
Explanation is at last, above embodiment is only unrestricted in order to the technical solution of the utility model to be described, other modifications that those of ordinary skills make the technical solution of the utility model or be equal to replacement, only otherwise break away from the spirit and scope of technical solutions of the utility model, all should be encompassed in the middle of the claim scope of the present utility model.
Claims (3)
1. intelligent lithium ion charger, it is characterized in that, comprise battery charging management chip (1), voltage reference module (2), current reference module (3), battery voltage detection circuit (4), battery temperature testing circuit (5), first oscillator (6) and second oscillator (7), described voltage reference module (2), current reference module (3), battery voltage detection circuit (4), battery temperature testing circuit (5), first oscillator (6) and second oscillator (7) are connected with described battery charging management chip (1) respectively.
2. intelligent lithium ion charger according to claim 1 is characterized in that, described intelligent lithium ion charger also comprises thermal-shutdown circuit (8), and described thermal-shutdown circuit (8) is connected with described battery charging management chip (1).
3. intelligent lithium ion charger according to claim 1 is characterized in that, described intelligent lithium ion charger also comprises hot modulation circuit (9), and described hot modulation circuit (9) is connected with described battery charging management chip (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320143884 CN203180580U (en) | 2013-03-27 | 2013-03-27 | An intelligent lithium ion charger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320143884 CN203180580U (en) | 2013-03-27 | 2013-03-27 | An intelligent lithium ion charger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203180580U true CN203180580U (en) | 2013-09-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320143884 Expired - Fee Related CN203180580U (en) | 2013-03-27 | 2013-03-27 | An intelligent lithium ion charger |
Country Status (1)
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| CN (1) | CN203180580U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103124097A (en) * | 2013-03-27 | 2013-05-29 | 南通林诺电子科技有限公司 | Intelligent lithium ion charger |
| CN103532388A (en) * | 2013-09-17 | 2014-01-22 | 中国科学院电工研究所 | Storage battery charging and discharging control method based on full bridge isolation two-way converter |
-
2013
- 2013-03-27 CN CN 201320143884 patent/CN203180580U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103124097A (en) * | 2013-03-27 | 2013-05-29 | 南通林诺电子科技有限公司 | Intelligent lithium ion charger |
| CN103532388A (en) * | 2013-09-17 | 2014-01-22 | 中国科学院电工研究所 | Storage battery charging and discharging control method based on full bridge isolation two-way converter |
| CN103532388B (en) * | 2013-09-17 | 2017-01-11 | 中国科学院电工研究所 | Storage battery charging and discharging control method based on full bridge isolation two-way converter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130904 Termination date: 20140327 |