CN208738892U - A kind of lithium battery charging management circuit - Google Patents
A kind of lithium battery charging management circuit Download PDFInfo
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- CN208738892U CN208738892U CN201821523411.9U CN201821523411U CN208738892U CN 208738892 U CN208738892 U CN 208738892U CN 201821523411 U CN201821523411 U CN 201821523411U CN 208738892 U CN208738892 U CN 208738892U
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- lithium battery
- main control
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- resistance
- charging management
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Abstract
The utility model provides a kind of lithium battery charging management circuit, it include: power supply module, charge management module and main control module, the power output end of the power supply module is connected with the ADC of the power input of the charge management module and main control module detection pin respectively, and the charge management module is connected with the main control module.The utility model uses independent power source path to provide power supply for the system where main control module, without taking electricity from the lithium battery to charge, can effectively reduce the charge and discharge cycles number of lithium battery, extend the service life of lithium battery；On this basis, the separation of the supply voltage of lithium battery and main control module, when lithium battery over-discharge, it is inserted into adaptor power supplies, system where the main control module directly can take the machine of establishing by cable from adapter, it no longer needs just to realize booting until lithium battery voltage reaches some starting point voltage, and then improves user experience, provide good hardware circuit basis for the path management of lithium battery charging.
Description
Technical field
The utility model relates to a kind of charging circuit more particularly to a kind of lithium battery charging management circuits.
Background technique
With the rapid development of smart machine, equipment is increasing for the demand of high-capacity lithium battery, the charging time pair
More and more important in the application experience of client, the charging time wishes the smaller the better, therefore supports filling for high current belt path management
Electric scheme is also more prominent for the importance of equipment.
But traditional charging circuit be without path management, when battery capacity close to full of when, system at this time
It can not go accurately to judge whether that battery is full of, the reason is that system judges full battery charging, there are two conditions: cell voltage reaches
4.2V, charging current are reduced to the 10% of CC electric current (constant-current charge electric current).It is taken away always since system is in running order certain
Electric current, while battery can not accurately detect charging current receiving the electric current that comes of charging IC, system, need to increase additional
Charging detection resistance detect charging current.In addition, when cell voltage is low-down, can not normal boot-strap,
Even inserting adapter, because the voltage of system is the voltage of battery at this time, battery electricity after a period of time that needs to charge
Pressure, which reaches booting electrical voltage point, to be switched on.Also, it is inserted for a long time due to adapter and carrys out work, due to the electric discharge of system, battery
Voltage can decline, and the carry out charge and discharge that charger can continue battery influence battery life.
Summary of the invention
Technical problem to be solved in the utility model be need to provide one kind can reduce battery charging and discharging cycle-index,
Extend the lithium battery charging management circuit of the service life of lithium battery, and further by the supply voltage of lithium battery and main control module
It is separated the path management to improve user experience, for lithium battery charging and hardware foundation is provided.
In this regard, the utility model provides a kind of lithium battery charging management circuit, comprising: power supply module, charge management module
And main control module, the power output end of the power supply module respectively with the power input of the charge management module and the master
The ADC detection pin of control module is connected, and the charge management module is connected with the main control module.
Further improvement of the utility model is that the power supply module is USB power supply module or USB power supply interface.
Further improvement of the utility model is that the main control module includes CPU.
Further improvement of the utility model is that the charge management module includes charging management chip U1, resistance R3
It is grounded with the first electric current setting pin of resistance R4, the charging management chip U1 by the resistance R3, the Charge Management
The second electric current setting pin of chip U1 is grounded by the resistance R4.
Further improvement of the utility model is that the resistance value of the resistance R3 is less than the resistance value of the resistance R4.
Further improvement of the utility model is, the charge management module further includes inductance L1 and capacitor C2, described
The power output switch pin of charging management chip U1 is connected with one end of the inductance L1, the charging management chip U1's
One end of system power supply pin, the other end of inductance L1 and capacitor C2 is connected to the power input of the main control module.
Further improvement of the utility model is that the charge management module further includes capacitor C3, resistance R6 and lithium electricity
Pond BAT1, the battery management pin of the charging management chip U1 respectively with one end of the resistance R6 and the main control module
Current sense end, the positive and described master control with one end of capacitor C3, lithium battery BAT1 respectively of the other end of the resistance R6
The battery detecting end line of module connects, and the other end of the capacitor C3 and the cathode of lithium battery BAT1 are grounded respectively.
Further improvement of the utility model is that the charge management module further includes resistance R2 and thermistor
NTC1, one end of the resistance R2 are connected to the power input pin of the charging management chip U1, and the resistance R2's is another
End and one end of thermistor NTC1 are connected to the overheat protector pin of the charging management chip U1, the thermistor NTC1
The other end ground connection.
Further improvement of the utility model is that the main control module further includes pull-up resistor R5, the pull-up resistor
One end of R5 is connected to DC power supply terminal, the other end of the pull-up resistor R5 respectively with the universal input end of the main control module
Mouth is connected with the output of charging management chip U1 control pin.
Compared with prior art, the utility model has the beneficial effects that: the power output end of the power supply module is distinguished
It is connected with the ADC of the power input of the charge management module and main control module detection pin, and the charging valve
Reason module is connected with the main control module, and then independent power source path is used to provide electricity for the system where main control module
Source can effectively reduce the charge and discharge cycles number of lithium battery without taking electricity from the lithium battery to charge, extend lithium battery
Service life；Also, when being inserted into adapter, additionally it is possible to avoid directly taking electricity from battery, further extending battery makes
Use the service life；On this basis, the utility model separates the supply voltage of lithium battery and main control module, when lithium battery over-discharge
When, adaptor power supplies are inserted into, system where the main control module directly can take the machine of establishing by cable from adapter, it is no longer necessary to wait until lithium
Cell voltage reaches some starting point voltage and just realizes booting, and then improves the usage experience of terminal user, fills for lithium battery
The path management of electricity provides good hardware circuit basis.
Detailed description of the invention
Fig. 1 is a kind of circuit diagram of embodiment of the utility model.
Specific embodiment
With reference to the accompanying drawing, the preferably embodiment of the utility model is described in further detail.
As shown in Figure 1, this example provides a kind of lithium battery charging management circuit, comprising: power supply module 1, charge management module 2
With main control module 3, the power output end of the power supply module 1 (charges with the power input of the charge management module 2 respectively
The IN pin of managing chip U1) it is connected with the ADC of the main control module 3 detection pin (the VCDT pin of main control chip U2),
The charge management module 2 is connected with the main control module 3.
Power supply module 1 described in this example is USB power supply module or USB power supply interface, for providing power supply.The main control module
3 preferably include CPU.The charge management module 2 preferably comprises the charge management circuit of charging management chip U1, the charging
Managing chip U1 preferably uses chip ETA6003.
After system insertion USB adapter where lithium battery charging management circuit described in this example, the VCDT of main control chip U2
ADC detection foot, real-time detection VIN(is equivalent to the power output end of power supply module 1) voltage, if being higher than 4.5V, just
It controls charging management chip U1 and opens charge function, system can differentiate insertion by the D+ pin and D- pin of power supply module 1
Adapter be standard adapter or USB device, and charging current can also be further set.During the charging process if
The NTC foot voltage of charging management chip U1 is more than the threshold value of setting, and charge function is automatically closed with regard to flip chip.When charging stops filling
Afterwards, battery temperature is restored to normality temperature, and NTC foot voltage is lower than setting value, and chip reopens charge function automatically.Chip is certainly
The dynamic charging process for completing trickle, constant current and constant pressure, software does not need to intervene at this time, is entirely that hardware circuit is working；When complete
After charging, when cell voltage is to 4.2V, charging management chip U1 gives system one by STAT pin (output control pin)
State interrupt instruction, system control charging management chip U1, charge closing function.Certainly, it is for lithium that the application is claimed
The path management of battery charging provides the lithium battery charging management circuit on hardware circuit basis, as the main control module 3 into
One step control strategy, belongs to preferred upgrading scheme.
In Fig. 1, the IN pin of charging management chip U1 is the input voltage of managing chip U1, when reaching input voltage limit value
When 4.5V, charging current can be reduced automatically, preferentially give system power supply, the input energy being more than give lithium battery BAT1 charging.
As system load continues to increase, when input power is not able to satisfy system power supply, lithium battery BAT1 passage path MOS and
System discharge is given in input together.Power source path management by the voltage section of system to the level of slightly higher than cell voltage, but not
3.6V minimum system voltage can be dropped below.By means of this characteristic, though lithium battery BAT1 electricity it is completely depleted or
When person's battery is removed, system is also able to maintain operation.
As shown in Figure 1, charge management module 2 described in this example preferably includes charging management chip U1, resistance R3 and resistance R4,
The first electric current setting pin ISET1 of the charging management chip U1 is grounded by the resistance R3, the charging management chip
The second electric current setting pin ISET2 of U1 is grounded by the resistance R4.The resistance value of the resistance R3 is less than the resistance R4's
Resistance value.Pin ISET1 and the second electric current setting pin ISET2, which is arranged, in first electric current can carry out two-stage setting to charging current,
Assuming that the charging current that the first electric current setting pin ISET1 is set by resistance is big, the second electric current is arranged what pin ISET2 was set
Electric current is small.When system identification to standard adapter needs high current quick charge, system can control handle by GPIO
USB_DET is set low, the charging current that charging chip will select the first electric current setting pin ISET1 to be arranged at this time.If working as system
When recognizing when standard USB, USB_DET can be dropped and set height, charging IC will select filling for the second electric current setting pin ISET2 setting
Electric current.
Charge management module 2 described in this example further includes inductance L1, capacitor C2, capacitor C3, resistance R6 and lithium battery BAT1, institute
The power output switch pin for stating charging management chip U1 is connected with one end of the inductance L1, the charging management chip U1
System power supply pin, the other end of inductance L1 and one end of capacitor C2 be connected to the power input of the main control module 3.
The battery management pin of the charging management chip U1 is passed with the electric current of one end of the resistance R6 and the main control module 3 respectively
Feel end, the other end of the resistance R6 positive and described main control module 3 with one end of capacitor C3, lithium battery BAT1 respectively
The connection of battery detecting end line, the other end of the capacitor C3 and the cathode of lithium battery BAT1 are grounded respectively.
Charge management module 2 described in this example further includes one end connection of resistance R2 and thermistor NTC1, the resistance R2
To the power input pin of the charging management chip U1, the other end of the resistance R2 is connected with one end of thermistor NTC1
To the overheat protector pin of the charging management chip U1, the other end ground connection of the thermistor NTC1.And then realize lithium electricity
Excess temperature ends defencive function.
Main control module 3 described in this example further includes pull-up resistor R5, and one end of the pull-up resistor R5 is connected to DC power supply
End, the other end of the pull-up resistor R5 respectively with the universal input port GPI of the main control module 3 and the Charge Management core
The output control pin STAT of piece U1 is connected.It is one OD that output control pin STAT, which is inside charging management chip U1,
(Open Drain N-MOS), i.e. output control pin, detection charged state can be pulled up by outside, defeated when charging
Level is low out, and output level is height when charging is complete, can trigger report when no battery or thermistor NTC1 triggering
Alert, the state of STAT pin is that low and high level constantly changes.
In conclusion the power output end of power supply module 1 described in this example is defeated with the power supply of the charge management module 2 respectively
Enter end to be connected with the ADC of the main control module 3 detection pin, and the charge management module 2 is connected with the main control module 3
It connects, and then system of the independent power source path where main control module 3 is used to provide power supply, without from the lithium battery to charge
In take electricity, the charge and discharge cycles number of lithium battery can be effectively reduced, extend the service life of lithium battery；Also, it is suitable in insertion
When orchestration, additionally it is possible to avoid directly taking electricity from battery, further extend battery；On this basis, this example will
The supply voltage of lithium battery and main control module 3 is separated, and when lithium battery over-discharge, is inserted into adaptor power supplies, the master control mould
3 place system of block directly can take the machine of establishing by cable from adapter, it is no longer necessary to until lithium battery voltage reaches some starting point voltage
It just realizes booting, and then improves the usage experience of terminal user, provided well firmly for the path management of lithium battery charging
Part circuit base.
Certainly, shown in FIG. 1 is that preferred realization circuit in practical applications can be according to the demand adaptability of client
The hardware circuit of Fig. 1 is modified to realize these functional modules, and then realizes the lithium battery charging management circuit of belt path management.
The specific embodiment of the above is the better embodiment of the utility model, and it is practical new not to limit this with this
The specific implementation range of type, the scope of the utility model includes being not limited to present embodiment, all according to the utility model
Shape, structure made by equivalence changes it is within the protection scope of the present utility model.
Claims (9)
1. a kind of lithium battery charging management circuit characterized by comprising power supply module, charge management module and main control module,
The power output end of the power supply module ADC with the power input of the charge management module and the main control module respectively
Detection pin is connected, and the charge management module is connected with the main control module.
2. lithium battery charging management circuit according to claim 1, which is characterized in that the power supply module is USB power supply
Module or USB power supply interface.
3. lithium battery charging management circuit according to claim 1, which is characterized in that the main control module includes CPU.
4. according to claim 1 to lithium battery charging management circuit described in 3 any one, which is characterized in that the charging valve
Reason module includes the first electric current setting pin of charging management chip U1, resistance R3 and resistance R4, the charging management chip U1
It is grounded by the resistance R3, the second electric current setting pin of the charging management chip U1 is grounded by the resistance R4.
5. lithium battery charging management circuit according to claim 4, which is characterized in that the resistance value of the resistance R3 is less than institute
State the resistance value of resistance R4.
6. lithium battery charging management circuit according to claim 4, which is characterized in that the charge management module further includes
The power output of inductance L1 and capacitor C2, the charging management chip U1 switch pin are connected with one end of the inductance L1,
One end of the system power supply pin of the charging management chip U1, the other end of inductance L1 and capacitor C2 is connected to the master control
The power input of module.
7. lithium battery charging management circuit according to claim 4, which is characterized in that the charge management module further includes
Capacitor C3, resistance R6 and lithium battery BAT1, the battery management pin of the charging management chip U1 is respectively with the resistance R6's
The current sense end of one end and the main control module, the other end of the resistance R6 respectively with one end of capacitor C3, lithium battery
The battery detecting end line of the positive and described main control module of BAT1 connects, the other end of the capacitor C3 and lithium battery BAT1's
Cathode is grounded respectively.
8. lithium battery charging management circuit according to claim 4, which is characterized in that the charge management module further includes
Resistance R2 and thermistor NTC1, one end of the resistance R2 are connected to the power input pin of the charging management chip U1,
The other end of the resistance R2 and one end of thermistor NTC1 are connected to the overheat protector pin of the charging management chip U1,
The other end of the thermistor NTC1 is grounded.
9. lithium battery charging management circuit according to claim 4, which is characterized in that the main control module further includes pull-up
Resistance R5, one end of the pull-up resistor R5 are connected to DC power supply terminal, the other end of the pull-up resistor R5 respectively with it is described
The output control pin of the universal input port of main control module and the charging management chip U1 are connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821523411.9U CN208738892U (en) | 2018-09-18 | 2018-09-18 | A kind of lithium battery charging management circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821523411.9U CN208738892U (en) | 2018-09-18 | 2018-09-18 | A kind of lithium battery charging management circuit |
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| Publication Number | Publication Date |
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| CN208738892U true CN208738892U (en) | 2019-04-12 |
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| CN201821523411.9U Active CN208738892U (en) | 2018-09-18 | 2018-09-18 | A kind of lithium battery charging management circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112491114A (en) * | 2020-11-24 | 2021-03-12 | 深圳市中孚能电气设备有限公司 | Lithium battery charger and lithium battery charging control method |
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2018
- 2018-09-18 CN CN201821523411.9U patent/CN208738892U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112491114A (en) * | 2020-11-24 | 2021-03-12 | 深圳市中孚能电气设备有限公司 | Lithium battery charger and lithium battery charging control method |
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