CN209608370U - A kind of lithium battery pack charger circuit - Google Patents
A kind of lithium battery pack charger circuit Download PDFInfo
- Publication number
- CN209608370U CN209608370U CN201920567934.1U CN201920567934U CN209608370U CN 209608370 U CN209608370 U CN 209608370U CN 201920567934 U CN201920567934 U CN 201920567934U CN 209608370 U CN209608370 U CN 209608370U
- Authority
- CN
- China
- Prior art keywords
- lithium battery
- diode
- battery pack
- charger circuit
- battery group
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model discloses a kind of lithium battery pack charger circuits, including resistance R1-R5, capacitor C1-C2, diode VD1, triode VT1-VT2 and Integrated circuit IC 1-IC2；When lithium battery group is in fully charged state, triode VT1 is in off state, and diode VD1 is in reverse operation state, so that automatism isolation between lithium battery group and charger circuit；The diode and triode that the utility model uses can forbid lithium battery group to discharge to charger circuit, the electricity of lithium battery group avoided to waste after lithium battery group is completely filled.
Description
Technical field
The utility model relates to arrive technical field of lithium batteries more particularly to a kind of lithium battery pack charger circuit.
Background technique
The lithium battery group of the application meaning be 8.4V lithium battery group, 8.4V refer to 2 4.2V lithium battery groups at, lithium electricity
Pond (cobalt acid lithium/LiMn2O4/or tertiary cathode) is all charging upper limit voltage 4.2V, and discharge average voltage 3.7 or 3.6V.
Existing lithium battery pack charger circuit makes lithium battery group and charger after completely filling to lithium battery group not in time
Between be mutually disengaged during, lithium battery group can discharge to charger circuit, cause to waste to lithium battery group electricity, therefore,
The prior art is defective, needs to improve.
Utility model content
The utility model provides a kind of lithium battery pack charger circuit, the above problem of solution.
To solve the above problems, the technical scheme that the utility model is provided is as follows:
A kind of lithium battery pack charger circuit, including resistance R1-R5, capacitor C1-C2, diode VD1, triode VT1-
VT2 and Integrated circuit IC 1-IC2；When lithium battery group is in fully charged state, triode VT1 is in off state, diode VD1
In reverse operation state, so that automatism isolation between lithium battery group and charger circuit.
Preferred technical solution, diode VD1 are IN4001 type silicon diode.
Preferred technical solution, triode VT1-VT2 are 2N2222 type NPN transistor.
Preferred technical solution, Integrated circuit IC 1 are the adjustable linear voltage regulator of LM317T type.
Preferred technical solution, Integrated circuit IC 2 are LM3420-8.4 type charge controller.
Beneficial effect compared with the existing technology is, using the above scheme, the diode of the utility model use and three poles
Pipe can forbid lithium battery group to discharge to charger circuit, the electricity of lithium battery group is avoided to waste after lithium battery group is completely filled.
Detailed description of the invention
Illustrate embodiment or technical solution in the prior art in order to clearer, it below will be to embodiment or the prior art
The required attached drawing used is briefly described in description, it is clear that, the accompanying drawings in the following description is only the one of utility model
A little embodiments for those of ordinary skill in the art without creative efforts, can also be according to these
Attached drawing obtains other attached drawings.
Fig. 1 is a kind of circuit diagram of lithium battery pack charger circuit of the utility model.
Specific embodiment
For the ease of understanding the utility model, in the following with reference to the drawings and specific embodiments, the utility model is carried out more detailed
Thin explanation.The preferred embodiment of the utility model is given in attached drawing.But the utility model can be with many different
Form is realized, however it is not limited to this specification described embodiment.On the contrary, purpose of providing these embodiments is makes to this
The understanding of the disclosure of utility model is more thorough and comprehensive.
It should be noted that it can directly on the other element when element is referred to as " being fixed on " another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to
To another element or it may be simultaneously present centering elements.Term used in this specification " fixation ", " integrated molding ",
For illustrative purposes only, the similar unit of structure is to identical label in the figure for "left", "right" and similar statement
Mark.
Unless otherwise defined, technical and scientific term all used in this specification and the skill for belonging to the utility model
The normally understood meaning of the technical staff in art field is identical.Art used in the description of the utility model in this specification
Language, which is only for the purpose of describing specific embodiments, is not intended to limitation the utility model.
As shown in Figure 1, one embodiment of the utility model is:
A kind of lithium battery pack charger circuit, including resistance R1-R5, capacitor C1-C2, diode VD1, triode VT1-
VT2 and Integrated circuit IC 1-IC2；When lithium battery group is in fully charged state, triode VT1 is in off state, diode VD1
In reverse operation state, so that automatism isolation between lithium battery group and charger circuit.
DC power supply is connect with the end+IN of the first end of resistance R1, the first end of capacitor C1, Integrated circuit IC 1 respectively；Electricity
The second end of resistance R1 is connect with the base stage of triode VT1；The OUT terminal of Integrated circuit IC 1 is connect with the first end of resistance R2；Resistance
The second end of R2 is connect with the anode of the first end of resistance R3, diode VD1 respectively；The cathode of diode VD1 respectively with three poles
The anode connection of the collector, lithium battery group of pipe VT1；The emitter of triode VT1 is connect with the end+IN of Integrated circuit IC 2；Collection
It is connect at the end COMP of IC circuit 2 with the second end of capacitor C2；The first end of capacitor C2 respectively with the second end of resistance R4, resistance
The OUT terminal connection of the first end, Integrated circuit IC 2 of R5；The first end of resistance R4 is connect with the base stage of triode VT2；Triode
The collector of VT2 is connect with the end ADJ of the second end of resistance R3, Integrated circuit IC 1 respectively；The second end of resistance R5, capacitor C1
Second end, the emitter of triode VT2, the cathode of lithium battery group, Integrated circuit IC 2 the end GND be grounded.
Diode VD1 is IN4001 type silicon diode；Triode VT1-VT2 is 2N2222 type NPN transistor；Integrated electricity
Road IC1 is the adjustable linear voltage regulator of LM317T type；Integrated circuit IC 2 is LM3420-8.4 type charge controller.
LM3420 series is a kind of control integrated circuit for specializing in compact lithium cell charging, it is by being electrically charged cell voltage
Difference is divided into three models, i.e. LM3420-4.2, LM3420-8.2, LM3420-12.6, and wherein the number representative of suffix is applicable in
Battery voltage value.LM3420 series is divided into A, B two types according to the difference of charging voltage error, and A class can guarantee at 25 DEG C
The charging voltage error of 1% temperature range of scholar is scholar 0.5%, and B class is ± 1%.LM3420 series is especially suitable for intelligence instrument
Power supply system.
M3420 is by reference voltage source, operational amplifier, NPN output driving transistor and temperature-compensating divider
Deng composition.The exportable 15mA electric current of NPN triode, the end COMP are amplifier inverting input terminal, can be by external frequency compensated circuit
To drive.
LM3420 belongs to parallel pressure regulator, it is commonly mounted in the negative-feedback circuit of charger, plays the work of benchmark and control
With.The end+IN is input terminal, and GND is ground terminal, for measuring the adjusting voltage for being added to battery terminal.If the voltage measured is low
In nominal electromotive force, then output end does not provide electric current, and only when the voltage of input terminal reaches nominal value, output end just provides electricity
Stream.The output electric current is used to the device work in drive feedback loop, and the output voltage of charger is made to be maintained at permitting for nominal value
Perhaps in range.
Working principle of the utility model is:
The supply voltage of the circuit is 13-20V, it is possible to provide the constant charge current of 1A.When charging starts, due to battery pack
Electromotive force be lower than 8.4V, therefore the output end no current of LM3420-8.4 exports, and VT2 ends at this time, and IC1 is due to the end ADJ is hanging
Play constant current, constant current are as follows: for ILIM=1.25/R2 when not charging, VT1 is in off state, it cut off battery with
Connection between IC2, in case battery is discharged by IC2.
When being charged, the electromotive force of VT1 saturation conduction, battery is the end IN and GND for being added to IC2, and IC2 is to electricity at this time
The electromotive force in pond is detected, and in the charging process of battery, the electromotive force of battery is gradually risen, and when being raised to 8.4V, IC2 is opened
Begin to provide base current to VT2, VT2 is connected and controls IC1, the current potential at the end ADJ.Then charging voltage is maintained at by IC1
8.4V or so, and adapt charging current to charged state, constant-voltage charge is carried out to battery.When battery reaches normal capacity,
Charging current can drop to small value, until being zero, charging is accused and completed at this time.Diode VD1 is used to that battery is prevented not charge
When can be discharged by IC1.
It should be noted that above-mentioned each technical characteristic continues to be combined with each other, the various embodiments not being enumerated above are formed,
It is accordingly to be regarded as the range of the utility model specification record；Also, it for those of ordinary skills, can be according to above stating
It is bright to be improved or converted, and all these modifications and variations all should belong to the protection model of the appended claims for the utility model
It encloses.
Claims (5)
1. a kind of lithium battery pack charger circuit, which is characterized in that including resistance R1-R5, capacitor C1-C2, diode VD1, three
Pole pipe VT1-VT2 and Integrated circuit IC 1-IC2；When lithium battery group is in fully charged state, triode VT1 is in off state,
Diode VD1 is in reverse operation state, so that automatism isolation between lithium battery group and charger circuit.
2. a kind of lithium battery pack charger circuit according to claim 1, which is characterized in that diode VD1 is IN4001
Type silicon diode.
3. a kind of lithium battery pack charger circuit according to claim 1, which is characterized in that triode VT1-VT2 is
2N2222 type NPN transistor.
4. a kind of lithium battery pack charger circuit according to claim 1, which is characterized in that Integrated circuit IC 1 is
LM317T type is adjustable linear voltage regulator.
5. a kind of lithium battery pack charger circuit according to claim 1, which is characterized in that Integrated circuit IC 2 is
LM3420-8.4 type charge controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920567934.1U CN209608370U (en) | 2019-04-24 | 2019-04-24 | A kind of lithium battery pack charger circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920567934.1U CN209608370U (en) | 2019-04-24 | 2019-04-24 | A kind of lithium battery pack charger circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209608370U true CN209608370U (en) | 2019-11-08 |
Family
ID=68406214
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920567934.1U Expired - Fee Related CN209608370U (en) | 2019-04-24 | 2019-04-24 | A kind of lithium battery pack charger circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209608370U (en) |
-
2019
- 2019-04-24 CN CN201920567934.1U patent/CN209608370U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191108 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |