CN209282860U - A kind of lithium battery charging circuit of the adjustable under-voltage protecting circuit of band - Google Patents
A kind of lithium battery charging circuit of the adjustable under-voltage protecting circuit of band Download PDFInfo
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- CN209282860U CN209282860U CN201821798985.7U CN201821798985U CN209282860U CN 209282860 U CN209282860 U CN 209282860U CN 201821798985 U CN201821798985 U CN 201821798985U CN 209282860 U CN209282860 U CN 209282860U
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- lithium battery
- circuit
- resistance
- adjustable under
- voltage
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Abstract
The utility model discloses a kind of lithium battery charging circuits of the adjustable under-voltage protecting circuit of band; belong to lithium battery charging security technology area; including charging terminal, adjustable under-voltage protecting circuit, charge management circuit, lithium battery, the charging terminal anode is connect by adjustable under-voltage protecting circuit with charge management circuit；The charge management circuit is connect with lithium battery；The charge management circuit includes metering chip U1, chip U2 with protection；The adjustable under-voltage protecting circuit includes resistance R22, resistance R25, resistance R24, P-channel field-effect transistor (PEFT) pipe Q4, N-channel field-effect tube Q5, the utility model have the advantages that it is of simple structure and low cost, with under-voltage protection, highly-safe.
Description
Technical field
The utility model relates to lithium battery charge security technology area, specially a kind of adjustable under-voltage protecting circuit of band
Lithium battery charging circuit.
Background technique
Lithium battery have operating voltage is high, small in size, light weight, energy height, memory-less effect, pollution-free, self discharge is small,
The advantages of having extended cycle life.Therefore, in daily life, lithium battery is seen everywhere, and is widely used in electric car, electronic
Vehicle, mobile phone, electric tool etc..
But the protecting circuit designed of lithium ion battery at present, industry generally use dedicated protection chip to realize, this
Kind dedicated protection chip application circuit, generally only charging overvoltage protection partially charge the protection core of prohibiting function with 0V
Piece can support lithium battery voltage to forbid charging the battery lower than design value, but this design value is usually a fixed value,
Different protection voltage settings cannot be provided lithium battery.
Utility model content
The purpose of this utility model is to provide a kind of lithium battery charging circuits of the adjustable under-voltage protecting circuit of band, have
Structure is simple, charging is quick, under-voltage protection, highly-safe advantage, and solving existing lithium battery charging circuit does not have under-voltage guarantor
The low problem of shield, safety.
To achieve the above object, the utility model provides the following technical solutions: a kind of adjustable under-voltage protecting circuit of band
Lithium battery charging circuit, including charging terminal, adjustable under-voltage protecting circuit, charge management circuit, lithium battery, feature exist
In: the charging terminal anode is connect by adjustable under-voltage protecting circuit with charge management circuit；The charge management circuit
It is connect with lithium battery；The charge management circuit includes metering chip U1, chip U2 with protection；The adjustable under-voltage protection
Circuit includes resistance R22, resistance R25, resistance R24, P-channel field-effect transistor (PEFT) pipe Q4, N-channel field-effect tube Q5, and the lithium battery is just
Pole is connect with the one end resistance R24；R24 other end is connect with one end of the pole G of N-channel field-effect tube Q5, resistance R25；Resistance
The other end of R25 and the cathode of lithium battery connect；The pole S of N-channel field-effect tube Q5 is also connect with the cathode of lithium battery, N ditch
The pole D of road field-effect tube Q5 is connect with the pole G of resistance R22 and P channel field-effect pipe Q4；The other end and lithium battery of R22
Output cathode connection；The pole D of Q4 is connect with the 8th foot of the metering chip U1 with protection；The pole S of P-channel field-effect transistor (PEFT) pipe Q4 and lithium
The output cathode of battery connects.
Preferably, the charge management circuit is provided with fuse F1.
Preferably, the metering chip U1, chip U2 power pins be provided with decoupling capacitor.
Preferably, the charging terminal is provided with capacitor C4, C6 and transient voltage suppressor for filtering
TSV1。
Preferably, the cathode and ground of the charging terminal, adjustable under-voltage protecting circuit, charge management circuit, lithium battery
Line connection, the ground wire include digitally with simulation ground.
Preferably, described digitally to be connected with simulation by RS resistance.
Preferably, field-effect tube Q4, Q5 can be substituted using triode.
Compared with prior art, the beneficial effects of the utility model are as follows:
1, the utility model has the advantages that structure is simple, easy to use, easy to maintain, low in cost.
2, the utility model is provided with multiple decoupling capacitors and transient voltage suppressor TSV1 for filtering, energy
The ripple for effectively Power supply belt being inhibited to come in improves the stability of power supply and ground level.And circuit is often very sensitive to power supply, surely
Fixed power level can guarantee the steady operation of circuit.
3, the utility model is being provided with adjustable under-voltage protecting circuit, can be with when lithium battery voltage is lower than preset value
Forbid charging to lithium battery.Meanwhile preset value can be adjusted by the ratio of resistance, thus increase the flexibility used,
Expand use scope, with high security, the wide advantage of use scope.
Detailed description of the invention
FIG. 1 is a schematic structural view of the utility model；
Fig. 2 is the utility model circuit diagram；
Fig. 3 is the adjustable under-voltage protecting circuit circuit diagram of the utility model；
In figure: 1- charging terminal；The adjustable under-voltage protecting circuit of 2-；3- charge management circuit；4- lithium battery.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
It please refers to Fig.1 to Fig.3, a kind of embodiment provided by the utility model: a kind of adjustable under-voltage protecting circuit of band
Lithium battery charging circuit, including charging terminal 1, adjustable under-voltage protecting circuit 2, charge management circuit 3, lithium battery 4, feature
Be: 1 anode of charging terminal is connect by adjustable under-voltage protecting circuit 2 with charge management circuit 3；The Charge Management
Circuit 3 is connect with lithium battery 4；The charge management circuit 3 includes metering chip U1, chip U2 with protection；It is described adjustable
Under-voltage protecting circuit 2 includes resistance R22, resistance R25, resistance R24, P-channel field-effect transistor (PEFT) pipe Q4, N-channel field-effect tube Q5, described
4 anode of lithium battery is connect with the one end resistance R24；R24 other end and the pole G of N-channel field-effect tube Q5, one end of resistance R25
Connection；The other end of resistance R25 is connect with the cathode of lithium battery 4；The pole S of N-channel field-effect tube Q5 is also negative with lithium battery 4
Pole connection, the pole D of N-channel field-effect tube Q5 is connect with the pole G of resistance R22 and P-channel field-effect transistor (PEFT) pipe Q4；Other the one of R22
End is connect with lithium battery output cathode；The pole D of Q4 is connect with the 8th foot of the metering chip U1 with protection；P-channel field-effect transistor (PEFT) pipe Q4
The pole S connect with the output cathode of lithium battery 4.
The charge management circuit 3 is provided with fuse F1.When exception, when electric current gradually rises, fuse occurs in circuit
F1 will be when current anomaly be increased to certain height and temperature, itself fusing cutting electric current protects circuit safety
Operation.
The metering chip U1, chip U2 power pins be provided with decoupling capacitor.Decoupling capacitor can provide more stable
Power supply, while the noise that element is coupled to power end can also be reduced, other elements can be reduced indirectly by this element noise
Influence.
The charging terminal 1 is provided with capacitor C4, C6 and transient voltage suppressor TSV1 for filtering.Work as wink
When time variant voltage inhibits the both ends diode TSV1 to be subjected to the high energy impact events of moment, it can be such that its impedance drops suddenly with high speed
It is low, at the same absorb a high current, by the voltage clamp between its both ends one it is scheduled numerically, so that it is guaranteed that subsequent electricity
Circuit component from transient state high-energy impact and damage, can effectively anti-over-voltage.
The charging terminal 1, adjustable under-voltage protecting circuit 2, charge management circuit 3, the cathode of lithium battery 4 and ground wire connect
Connect, the ground wire include digitally with simulation ground.Since digital circuit has a large amount of digital informations, cause digitally to have a large amount of
Harmonic noise.Harmonic noise is coupled to analog circuit by ground level in order to prevent, it is therefore desirable to digitally will with simulation divide
It opens.
It is described digitally to be connected with simulation by RS resistance or 0 Europe resistance or magnetic bead.Single-point grounding has noise low,
The equal advantage of direct current point.
Field-effect tube Q4, Q5 can be substituted using triode.
Working principle: in utility model works, including charging terminal 1, adjustable under-voltage protecting circuit 2, Charge Management
Circuit 3, lithium battery 4.Charging terminal 1 is used as interface, for accessing charger.Charge management circuit 3 is used to carry out lithium battery 4
Charging.Adjustable under-voltage protecting circuit 2 is used for under-voltage protection, when voltage is lower than preset value, can be powered off automatically, prevent from endangering
Danger occurs.
The adjustable under-voltage protecting circuit 2 includes resistance R22, resistance R25, resistance R24, P-channel field-effect transistor (PEFT) pipe Q4, N
Channel field-effect pipe Q5.Resistance R24 and resistance R25 play partial pressure to 4 voltage of lithium battery in circuit, this two resistance are arranged
The input voltage of the pole G of the corresponding adjustable N-channel field-effect tube Q5 of resistance value, due to the cut-in voltage of N-channel field-effect tube Q
VGS (th)=1.0V, when the voltage of the pole G and the pole S is lower than 1.0V, the pole D, S of N-channel field-effect tube Q5 is closed.
Resistance R22 is pull-up resistor in circuit, and cut-in voltage VGS (th)=- 1.7V of P-channel field-effect transistor (PEFT) pipe Q4 works as G
When the voltage of pole and the pole S is higher than -1.7V, P-channel field-effect transistor (PEFT) pipe Q4 is closed.
When 4 voltage of lithium battery is normal, 4 voltage of lithium battery inputs to N-channel after resistance R24 and resistance R25 partial pressure
Field-effect tube Q5, since voltage is higher than the cut-in voltage VGS (th), the DS of N-channel field-effect tube Q5 of N-channel field-effect tube Q5
Pole conducting, the G pole tension of P-channel field-effect transistor (PEFT) pipe Q4 pulled down to GND, and the pole S of P-channel field-effect transistor (PEFT) pipe Q4 is the defeated of lithium battery 4
It is positive out, the VGS < -1.7V of P-channel field-effect transistor (PEFT) pipe Q4 at this time, the pole D, S conducting of P-channel field-effect transistor (PEFT) pipe Q4, lithium battery 4 it is defeated
Voltage passes to the 8th foot including the metering chip U1 with protection by P-channel field-effect transistor (PEFT) pipe Q4 out, including the metering core with protection
Piece U1 is worked normally, and lithium battery can be charged normal at this time.
In 4 brownout of lithium battery, be transferred to the brownout of N-channel field-effect tube Q5, N-channel field-effect tube Q5 without
Method is opened, and at this time if charger is inserted into charging terminal 1, the G pole tension of P-channel field-effect transistor (PEFT) pipe Q4 is essentially pulled up to by R22 to be filled
The pole D, S of electrical voltage, P-channel field-effect transistor (PEFT) pipe Q4 is closed, the 8th foot no-voltage input including the metering chip U1 with protection,
U1 enters shutdown state, and U1 closes Q1 pipe, and lithium battery can not charge.
By adjusting the resistance value of two divider resistances of resistance R24 and resistance R25, adjustable N-channel field-effect tube Q5's
Input voltage, to realize the function that can control lithium battery 4 charge.
It is obvious to a person skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and
And without departing substantially from the spirit or essential attributes of the utility model, it can realize that this is practical new in other specific forms
Type.Therefore, in all respects, the present embodiments are to be considered as illustrative and not restrictive, this is practical new
The range of type is indicated by the appended claims rather than the foregoing description, it is intended that containing for the equivalent requirements of the claims will be fallen in
All changes in justice and range are embraced therein.It should not treat any reference in the claims as limiting
Related claim.
Claims (7)
1. a kind of lithium battery charging circuit of the adjustable under-voltage protecting circuit of band, including charging terminal (1), adjustable under-voltage protection
Circuit (2), charge management circuit (3), lithium battery (4), it is characterised in that: charging terminal (1) anode is owed by adjustable
Voltage protection circuit (2) is connect with charge management circuit (3)；The charge management circuit (3) connect with lithium battery (4)；It is described to fill
Fulgurite reason circuit (3) includes metering chip U1, chip U2 with protection；The adjustable under-voltage protecting circuit (2) includes resistance
R22, resistance R25, resistance R24, P-channel field-effect transistor (PEFT) pipe Q4, N-channel field-effect tube Q5, lithium battery (4) anode and resistance
The connection of the one end R24；R24 other end is connect with one end of the pole G of N-channel field-effect tube Q5, resistance R25；Resistance R25 is in addition
One end is connect with the cathode of lithium battery (4)；The pole S of N-channel field-effect tube Q5 is also connect with the cathode of lithium battery (4), N-channel field
The pole D of effect pipe Q5 is connect with the pole G of resistance R22 and P-channel field-effect transistor (PEFT) pipe Q4；The other end and lithium battery of R22 exports
Anode connection；The pole D of Q4 is connect with the 8th foot of the metering chip U1 with protection；The pole S of P-channel field-effect transistor (PEFT) pipe Q4 and lithium battery
(4) output cathode connection.
2. a kind of lithium battery charging circuit of the adjustable under-voltage protecting circuit of band according to claim 1, it is characterised in that:
The charge management circuit (3) is provided with fuse F1.
3. a kind of lithium battery charging circuit of the adjustable under-voltage protecting circuit of band according to claim 1, it is characterised in that:
The metering chip U1, chip U2 power pins be provided with decoupling capacitor.
4. a kind of lithium battery charging circuit of the adjustable under-voltage protecting circuit of band according to claim 1, it is characterised in that:
The charging terminal (1) is provided with capacitor C4, C6 and transient voltage suppressor TSV1 for filtering.
5. a kind of lithium battery charging circuit of the adjustable under-voltage protecting circuit of band according to claim 1, it is characterised in that:
The charging terminal (1), adjustable under-voltage protecting circuit (2), charge management circuit (3), the cathode of lithium battery (4) and ground wire connect
Connect, the ground wire include digitally with simulation ground.
6. a kind of lithium battery charging circuit of the adjustable under-voltage protecting circuit of band according to claim 5, it is characterised in that:
It is described digitally to be connected with simulation by RS resistance.
7. a kind of lithium battery charging circuit of the adjustable under-voltage protecting circuit of band according to claim 5, it is characterised in that:
Field-effect tube Q4, Q5 can be substituted using triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821798985.7U CN209282860U (en) | 2018-11-02 | 2018-11-02 | A kind of lithium battery charging circuit of the adjustable under-voltage protecting circuit of band |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821798985.7U CN209282860U (en) | 2018-11-02 | 2018-11-02 | A kind of lithium battery charging circuit of the adjustable under-voltage protecting circuit of band |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209282860U true CN209282860U (en) | 2019-08-20 |
Family
ID=67599915
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821798985.7U Active CN209282860U (en) | 2018-11-02 | 2018-11-02 | A kind of lithium battery charging circuit of the adjustable under-voltage protecting circuit of band |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209282860U (en) |
-
2018
- 2018-11-02 CN CN201821798985.7U patent/CN209282860U/en active Active
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