CN213027498U - Lithium battery charging control integrated circuit - Google Patents
Lithium battery charging control integrated circuit Download PDFInfo
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- CN213027498U CN213027498U CN202021971814.7U CN202021971814U CN213027498U CN 213027498 U CN213027498 U CN 213027498U CN 202021971814 U CN202021971814 U CN 202021971814U CN 213027498 U CN213027498 U CN 213027498U
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- triode
- lithium battery
- microcontroller
- resistor
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 73
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 73
- 238000005516 engineering process Methods 0.000 abstract description 2
- 239000003990 capacitor Substances 0.000 description 3
- 230000006870 function Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 description 1
- 230000005779 cell damage Effects 0.000 description 1
- 208000037887 cell injury Diseases 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 229920001690 polydopamine Polymers 0.000 description 1
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Abstract
The utility model relates to a lithium battery charging technology field discloses a higher and stable lithium battery charging control integrated circuit of output voltage of security, possesses: the microcontroller (U101) is provided with a plurality of threshold signals, one signal end of the microcontroller is connected with the negative end of the lithium battery to be charged, and the microcontroller is used for detecting the voltage signal of the negative end and comparing the voltage signal with the threshold signals; the collector of the fourth triode (VT104) is connected with the anode of the other lithium battery, and the base of the fourth triode (VT104) is connected with one output end of the microcontroller (U101); when the voltage signal of the lithium battery to be charged is detected to be larger than any threshold signal, the microcontroller (U101) controls and outputs the charging current of the lithium battery according to the comparison result.
Description
Technical Field
The utility model relates to a lithium battery charging technology field, more specifically say, relate to a lithium battery charging control integrated circuit.
Background
With the miniaturization of electronic products, portable products such as mobile phones, digital cameras, PDAs, and MP3 walkmans have become more popular and popular, and such products require a large amount of batteries. At present, in various rechargeable batteries, compared with a common nickel-cadmium nickel-hydrogen battery, a lithium battery has the advantages of small volume, light weight, low self-discharge rate and no memory effect, and in the use process, the lithium battery needs to be charged to the maximum voltage due to the fact that the lithium battery has strict requirements on a charger, but the lithium battery is damaged due to overvoltage charging.
Therefore, how to improve the charging voltage control accuracy is a technical problem that needs to be solved urgently by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, to prior art's the aforesaid because the lithium cell requires more harsher to the charger, need charge the lithium cell to maximum voltage, nevertheless overvoltage charging can cause the defect of lithium cell damage, provides a higher and stable lithium cell charging control integrated circuit of output voltage of security.
The utility model provides a technical scheme that its technical problem adopted is: a lithium battery charging control integrated circuit is configured, and the lithium battery charging control integrated circuit is provided with:
the microcontroller is provided with a plurality of threshold signals, one signal end of the microcontroller is connected with the negative electrode end of the lithium battery to be charged, and the microcontroller is used for detecting the voltage signal of the negative electrode end and comparing the voltage signal with the threshold signals;
a base electrode of the first triode is connected with a PWM signal output end of the microcontroller;
the base electrode of the second triode is connected with the collector electrode of the first triode;
the emitter of the third triode is coupled with the collector of the second triode, the collector of the third triode is connected with the anode of a lithium battery, and the base of the third triode is connected with one output end of the microcontroller;
the emitter of the fourth triode is coupled with the collector of the second triode, the collector of the fourth triode is connected with the anode of the other lithium battery, and the base of the fourth triode is connected with one output end of the microcontroller;
and when the voltage signal of the lithium battery to be charged is detected to be larger than any threshold signal, the microcontroller controls and outputs the charging current of the lithium battery according to the comparison result.
In some embodiments, the first transistor is an NPN transistor, and the second, third, and fourth transistors are PNP transistors.
In some embodiments, the lithium battery charging circuit further comprises a first resistor, one end of the first resistor is connected with a signal end of the microcontroller, and the other end of the first resistor is connected with a negative electrode end of the lithium battery to be charged.
In some embodiments, the microcontroller further comprises a sixth resistor, one end of the sixth resistor is connected to the PWM signal output terminal of the microcontroller, and the other end of the sixth resistor is connected to the base of the first transistor.
In some embodiments, the transistor further comprises a seventh resistor and an eighth resistor connected in series, one end of the seventh resistor is connected to the collector of the first transistor, one end of the eighth resistor is coupled to the emitter of the second transistor,
the other ends of the seventh resistor and the eighth resistor are connected with the base electrode of the second triode.
In some embodiments, the device further comprises a first inductor and a first diode, one end of the first inductor and a cathode of the first diode are respectively connected with a collector of the second triode,
the anode of the first diode is connected with the common end, and the other end of the first inductor is connected with the collector electrodes of the third triode and the fourth triode respectively.
In the lithium battery charging control integrated circuit of the present invention, the lithium battery charging control integrated circuit comprises a microcontroller for detecting a voltage signal of the negative terminal, wherein the microcontroller compares the voltage signal with a threshold signal; and when the voltage signal of the lithium battery to be charged is detected to be larger than any threshold signal, the microcontroller controls and outputs the charging current of the lithium battery according to the comparison result. Compared with the prior art, the voltage signal of the negative pole of the lithium battery to be charged is detected by setting the microcontroller, then the voltage signal is compared with the threshold signal, when the voltage signal is greater than any threshold signal, the microcontroller controls the output of the charging current of the lithium battery according to the comparison result, and the problem that the lithium battery is required to be harsher to the charger and needs to be charged to the maximum voltage but the lithium battery is damaged due to overvoltage charging in the prior art is solved.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
fig. 1 is a schematic circuit diagram of an embodiment of a lithium battery charging control integrated circuit according to the present invention.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, in the first embodiment of the lithium battery charging control integrated circuit of the present invention, the lithium battery charging control integrated circuit 100 includes a microcontroller U101, a first triode VT101, a second triode VT102, a third triode VT103, and a fourth triode VT 104.
The microcontroller U101 is used for logic operation, pulse signal output, charging current control and overvoltage protection.
The triode has the functions of switching and signal amplification.
Specifically, microcontroller U101 is provided with a plurality of threshold signals, wherein the threshold signals are set to: 3.2V-3.6V; 3.7V-4.17V and greater than 4.2V.
A signal terminal (corresponding to the pin PB 2) of the microcontroller U101 is connected to a negative terminal of a lithium Battery (corresponding to the U-Battery) to be charged, and is configured to detect a voltage signal at the negative terminal of the lithium Battery.
Specifically, when the voltage of a signal terminal (corresponding to the pin PB 2) of the microcontroller U101 exceeds 1.1V, it indicates that the lithium battery to be charged has been placed in the charging port, and starts to perform charging; when the voltage of the signal terminal (corresponding to the PB2 pin) is lower than 1.1V, the lithium battery to be charged is not placed in the charging port and does not perform a charging action.
The microcontroller U101 compares the voltage signal of the negative terminal of the lithium Battery to be charged (corresponding to U-Battery) with a built-in threshold signal.
It should be noted that the voltage signal refers to a voltage signal during the process of charging the lithium battery, in other words, a dynamic voltage signal.
Further, the base of the first transistor VT101 is connected to the PWM signal output terminal (corresponding to 10 pins) of the microcontroller U101 through the sixth resistor R106, and the PWM pulse signal output by the microcontroller U101 is input to the base of the first transistor VT101 through the sixth resistor R106, so as to control the operating state of the first transistor VT 101.
The emitter of the first transistor VT101 is connected to the common terminal.
The first transistor VT101 is an NPN transistor.
The base of the second transistor VT102 is connected to the collector of the first transistor VT101 through a seventh resistor R107 and an eighth resistor R108 connected in series.
An emitter of the third transistor VT103 is coupled to a collector of the second transistor VT102, the collector of the third transistor VT103 is connected to an anode of a lithium battery, a base of the third transistor VT103 is connected to an output terminal (corresponding to the PA1 terminal) of the microcontroller U101 through the ninth resistor R109, and a level signal (a high level or a low level signal) output by the microcontroller U101 is input to the base of the third transistor VT103 through the ninth resistor R109.
An emitter of the fourth transistor VT104 is connected to a collector of the second transistor VT102, a collector of the fourth transistor VT104 is connected to a positive electrode of another lithium battery, a base of the fourth transistor VT104 is connected to an output terminal (corresponding to the PA0 terminal) of the microcontroller U101 through a tenth resistor R110, and a level signal (a high level or a low level signal) output by the microcontroller U101 is input to the base of the fourth transistor VT104 through the tenth resistor R110.
It should be noted that the third transistor VT103 and the fourth transistor VT104 are both PNP type, and their base driving signals are-0.5V.
When a signal terminal (corresponding to the PA2 terminal) of the microcontroller U101 detects that a voltage signal of a lithium Battery (corresponding to U-Battery) to be charged is greater than any threshold signal, the microcontroller U101 controls and outputs a charging current to the lithium Battery according to a comparison result between any threshold signal and the voltage signal.
For example, when the voltage signal of the lithium Battery (corresponding to U-Battery) to be charged is lower than 3.6V, i.e. falls within a range of 3.2V to 3.6V of a threshold signal, the microcontroller U101 performs trickle charging with 150mA current, and after the trickle charging is performed for at least 10 minutes, the 600mA fast charging is performed;
when the voltage signal of the lithium Battery (corresponding to U-Battery) to be charged is higher than 3.7V, namely falls into the range of 3.7V to 4.17V of another threshold signal, the microcontroller U101 is rapidly charged at 600 mA;
when the voltage signal of the lithium Battery (corresponding to the U-Battery) to be charged is higher than 4.2V, namely falls into the range that the threshold signal is larger than 4.2V, the microcontroller U101 charges by using a constant voltage instead, and the charging current is slowly reduced;
when the charging current is less than 30mA, the lithium battery is considered to be fully charged, and the charging is finished;
if the lithium battery is not fully charged after being charged for 2 hours, stopping charging;
if the voltage of the rechargeable battery is greater than 4.17V, the voltage of the rechargeable battery is too high, and the reason may be that the user misplaces the battery, and the charger stops charging, so that danger is avoided.
By using the technical scheme, the voltage signal of the negative electrode of the lithium battery to be charged is detected by setting the microcontroller U101, then the voltage signal is compared with any threshold signal, when the voltage signal is greater than any threshold signal, the microcontroller U101 controls the output of the charging current of the lithium battery according to the comparison result, and the problem that the lithium battery is required to be charged to the maximum voltage because the lithium battery is strict on the charger in the prior art, but the lithium battery is damaged due to overvoltage charging is solved.
In some embodiments, in order to improve the accuracy of the voltage signal, a first resistor R101 may be disposed in the integrated circuit, wherein the resistance of the first resistor R101 is selected to be 100 Ω.
Specifically, one end of the first resistor R101 is connected to a signal end (corresponding to the PB2 end) of the microcontroller U101, the other end of the first resistor R101 is connected to a negative electrode end of the lithium Battery to be charged (corresponding to the U-Battery), and a voltage signal of the negative electrode end of the lithium Battery to be charged (corresponding to the U-Battery) is fed back to the microcontroller U101 through the first resistor R101 and then compared with a threshold signal to obtain a comparison result for controlling the magnitude of the charging current.
In some embodiments, in order to improve the performance of the integrated circuit, a sixth resistor R106 and a fourth capacitor C104 may be disposed in the integrated circuit and connected in parallel, wherein the resistance of the sixth resistor R106 is selected to be 1.2K Ω.
Specifically, one end of the sixth resistor R106 and one end of the fourth capacitor C104 are connected to a PWM signal output end (corresponding to 10 pins) of the microcontroller U101, the other end of the sixth resistor R106 and the other end of the fourth capacitor C104 are connected to a base of the first transistor VT101, and a PWM signal (or a pulse signal) output by the microcontroller U101 is input to the base of the first transistor VT101 through the sixth resistor R106, and is used for controlling a working state of the first transistor VT101 through the PWM signal (or the pulse signal).
In some embodiments, in order to improve the performance of the integrated circuit, a seventh resistor R107 and an eighth resistor R108 connected in series may be disposed in the integrated circuit, wherein the resistance of the seventh resistor R107 is selected to be 200 Ω, and the resistance of the eighth resistor R108 is selected to be 100 Ω.
Specifically, one end of the seventh resistor R107 is connected to the collector of the first transistor VT101, one end of the eighth resistor R108 is coupled to the emitter of the second transistor VT102, and the other ends of the seventh resistor R107 and the eighth resistor R108 are connected to the base of the second transistor VT 102.
In some embodiments, the device further includes a first inductor L101 and a first diode D101, wherein the first inductor L101 has a filtering function.
Specifically, one end of the first inductor L101 and the cathode of the first diode D101 are respectively connected to the collector of the second transistor VT102, the anode of the first diode D101 is connected to the common terminal, and the other end of the first inductor L101 is respectively connected to the collectors of the third transistor VT103 and the fourth transistor VT 104.
That is, the PWM signal output from the microcontroller U101 is input to the third transistor VT103 and the fourth transistor VT104 via the first transistor VT101 and the second transistor VT 102.
While the embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many modifications may be made by one skilled in the art without departing from the spirit and scope of the present invention as defined in the appended claims.
Claims (6)
1. A lithium battery charging control integrated circuit is characterized by comprising:
the microcontroller is provided with a plurality of threshold signals, one signal end of the microcontroller is connected with the negative electrode end of the lithium battery to be charged, and the microcontroller is used for detecting the voltage signal of the negative electrode end and comparing the voltage signal with the threshold signals;
a base electrode of the first triode is connected with a PWM signal output end of the microcontroller;
the base electrode of the second triode is connected with the collector electrode of the first triode;
the emitter of the third triode is coupled with the collector of the second triode, the collector of the third triode is connected with the anode of a lithium battery, and the base of the third triode is connected with one output end of the microcontroller;
the emitter of the fourth triode is coupled with the collector of the second triode, the collector of the fourth triode is connected with the anode of the other lithium battery, and the base of the fourth triode is connected with one output end of the microcontroller;
and when the voltage signal of the lithium battery to be charged is detected to be larger than any threshold signal, the microcontroller controls and outputs the charging current of the lithium battery according to the comparison result.
2. The lithium battery charging control integrated circuit of claim 1,
the first triode is an NPN triode, and the second triode, the third triode and the fourth triode are PNP triodes.
3. The lithium battery charging control integrated circuit of claim 1,
the lithium battery charging circuit further comprises a first resistor, one end of the first resistor is connected with a signal end of the microcontroller, and the other end of the first resistor is connected with the negative electrode end of the lithium battery to be charged.
4. The lithium battery charging control integrated circuit according to claim 1 or 2,
the PWM signal output end of the microcontroller is connected with the base electrode of the first triode, and the other end of the first triode is connected with the base electrode of the second triode.
5. The lithium battery charging control integrated circuit according to claim 1 or 2,
the transistor also comprises a seventh resistor and an eighth resistor which are connected in series, wherein one end of the seventh resistor is connected with the collector electrode of the first triode, one end of the eighth resistor is coupled with the emitter electrode of the second triode,
the other ends of the seventh resistor and the eighth resistor are connected with the base electrode of the second triode.
6. The lithium battery charging control integrated circuit of claim 1,
the device also comprises a first inductor and a first diode, wherein one end of the first inductor and the cathode of the first diode are respectively connected with the collector of the second triode,
the anode of the first diode is connected with the common end, and the other end of the first inductor is connected with the collector electrodes of the third triode and the fourth triode respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021971814.7U CN213027498U (en) | 2020-09-10 | 2020-09-10 | Lithium battery charging control integrated circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021971814.7U CN213027498U (en) | 2020-09-10 | 2020-09-10 | Lithium battery charging control integrated circuit |
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| Publication Number | Publication Date |
|---|---|
| CN213027498U true CN213027498U (en) | 2021-04-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021971814.7U Expired - Fee Related CN213027498U (en) | 2020-09-10 | 2020-09-10 | Lithium battery charging control integrated circuit |
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| Country | Link |
|---|---|
| CN (1) | CN213027498U (en) |
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2020
- 2020-09-10 CN CN202021971814.7U patent/CN213027498U/en not_active Expired - Fee Related
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Granted publication date: 20210420 |