CN206332464U - A kind of lithium battery charging management circuit - Google Patents
A kind of lithium battery charging management circuit Download PDFInfo
- Publication number
- CN206332464U CN206332464U CN201621091621.6U CN201621091621U CN206332464U CN 206332464 U CN206332464 U CN 206332464U CN 201621091621 U CN201621091621 U CN 201621091621U CN 206332464 U CN206332464 U CN 206332464U
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- Prior art keywords
- light emitting
- emitting diode
- lithium battery
- charging management
- charging
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model discloses a kind of lithium battery charging management circuit, including the input circuit by offer charge power supply, charge management circuit and the output circuit composition being connected with lithium battery, the charge management circuit includes charging management chip, first light emitting diode and the second light emitting diode, the BAT pins and VDD pins of the charging management chip and the positive pole for connecting the first light emitting diode and the second light emitting diode respectively, the negative pole of first light emitting diode is connected with the negative pole of the second light emitting diode, the output circuit includes LDO low pressure difference linear voltage regulators, LDO low pressure difference linear voltage regulators are connected by the BAT pins of the first light emitting diode and charging management chip, provided with switch between first light emitting diode and LDO low pressure difference linear voltage regulators.The utility model meets the requirement of system power supply and battery charging simultaneously, improves the power supply capacity of charging circuit, high capacity cell charging work can be completed fast and stable.
Description
Technical field
The utility model is related to a kind of battery charger, more particularly to a kind of lithium battery charging management circuit.
Background technology
At present, lithium battery power supply, such as smart mobile phone, panel computer are used mobile electronic product more.Due to properties of product
Stronger and stronger, function is more and more, necessarily brings the increase of power consumption and the decrease of battery durable ability.For example, smart mobile phone
It can not only make a phone call, send short messages, moreover it is possible to surf the Net, play game, see a film.When using these functions, because battery is needed
Very big electric current is provided, the problem of battery durable ability is not enough will necessarily be just produced.For this problem, manufacturer is on the one hand
The power consumption of product is reduced as far as possible, and on the other hand selection uses the bigger battery of capacity.
The increase of mobile electronic product oneself power consumption and the increase of battery capacity, are all proposed higher to lithium cell charging
It is required that.For example, 1000mAh lithium battery, if charged using 500mA charging circuits, can just fill for about 2 hours
It is full.If selecting 3000mAh battery in order to improve the endurance of product, but still filled using 500mA charging circuits
If electricity, then battery could be full of by needing the time of more than 6 hours.In order to shorten the charging interval, charging electricity must be improved
Stream.And the raising of charging current, the power consumption of charging chip can be increased, the system failure may be caused due to heat dissipation problem.Cause
This, manufacturer can be very careful when the charging circuit for selecting more than 1A comes for lithium cell charging.
Lithium battery charging circuit typically all has to lithium cell charging and gives system power supply two kinds of functions.But due to charging valve
The power supply capacity of reason chip itself is certain, if the electric current increase of system need of work, will certainly cause battery charging electricity
The reduction of stream.If the power supply capacity of charging management chip itself is not met by system requirements of one's work, battery not but not
It is electrically charged, it is necessary to be system power supply, to maintain the normal work of system, directly results in battery charging very slow or battery electric quantity
The situation for filling fewer and fewer occurs.
The basic method solved the above problems is the power supply capacity for improving charging circuit.Due to simultaneously for system power supply and
Need to provide very big electric current for battery charging, common charging circuit is difficult to meet to require.
Utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art can to improve the power supply of charging circuit there is provided a kind of
Ability, while meeting the lithium battery charging management circuit of the requirement of system power supply and battery charging.
The technical solution of the utility model is as follows：
A kind of lithium battery charging management circuit, including by the input circuit of offer charge power supply, charge management circuit and with
The output circuit composition of lithium battery connection, the input circuit connects charge management circuit, and the charge management circuit connection is defeated
Go out circuit, the charge management circuit includes charging management chip, the first light emitting diode and the second light emitting diode, described to fill
The BAT pins and VDD pins of electric managing chip and first light emitting diode and the second light emitting diode are connected respectively just
Pole, the negative pole of first light emitting diode is connected with the negative pole of the second light emitting diode, and the output circuit includes LDO low pressure
Difference linear constant voltage regulator, the LDO low pressure difference linear voltage regulators pass through the first light emitting diode and the BAT of the charging management chip
Pin is connected, provided with switch between first light emitting diode and LDO low pressure difference linear voltage regulators.
In the above-mentioned technical solutions, the LDO low pressure difference linear voltage regulators use RT9193-3.3V, make the defeated of lithium battery
Go out voltage stabilization in 3.3V.
In the above-mentioned technical solutions, first light emitting diode and the second light emitting diode use germanium diode or Xiao Te
Based diode or switch mosfet pipe.
In the above-mentioned technical solutions, the VDD pins and STAT pins of the charging management chip are additionally provided with charging and indicated
Circuit, the charging indication includes two LED lights.
In the above-mentioned technical solutions, the charging management chip uses MCP73831.
In the above-mentioned technical solutions, the charge power supply uses 5V external power supply.
Compared with prior art, the beneficial effects of the utility model are：The utility model is by by charging management chip
BAT pins and VDD pins and the positive pole for connecting the first light emitting diode and the second light emitting diode respectively, the first light-emitting diodes
The negative pole of pipe is connected with the negative pole of the second light emitting diode.So that the enforceable rise of the voltage of BAT pins, makes Charge Management
Chip is judged as that lithium battery has carried out constant-current charging phase, so output high current, can drive successive load LDO low voltage difference lines
Property voltage-stablizer, the LDO low pressure difference linear voltage regulators use RT9193-3.3V, make the output voltage stabilization of lithium battery in 3.3V.
The utility model greatly improves the power supply capacity of charging circuit, while the requirement of system power supply and battery charging is met, can be fast
Speed stably accomplishes high capacity cell charging work.
Brief description of the drawings
Fig. 1 is the circuit diagram of the utility model embodiment.
Embodiment
For principle of the present utility model is expanded on further, the utility model is done below in conjunction with the drawings and specific embodiments
It is further described.
Refer to and a kind of lithium battery charging management circuit is shown in Fig. 1, figure, it is by input circuit, charge management circuit
Constituted with output circuit, the input circuit connects charge management circuit, the charge management circuit connects output circuit.
The charge management circuit includes charging management chip U1, the first light emitting diode D1 and the second light emitting diode
D2, the charging management chip U1 BAT pins 3 and VDD pins 4 and the first light emitting diode D1 and second is connected respectively
Light emitting diode D2 positive pole, the negative pole of the first light emitting diode D1 is connected with the second light emitting diode D2 negative pole, institute
State output circuit and pass through the first light-emitting diodes including LDO low pressure difference linear voltage regulators U2, the LDO low pressure difference linear voltage regulators U2
Pipe D1 is connected with the BAT pins 3 of the charging management chip U1, and the first light emitting diode D1 and LDO low pressure difference linearities are steady
Provided with switch SW2 between depressor U2.
The charging management chip U1 uses MCP73831, the VDD pins 4 and STAT pins of the charging management chip U1
1 is additionally provided with charging indication, and the charging indication includes two LED lights.
Described lithium battery charging management circuit, under normal operating conditions, input circuit input 5V external power supply are arrived
SW2 is switched, while by charge management circuit, after charge management circuit is handled, output current charges to lithium battery E.This
Shi Suoshu switches SW2 left side point voltage is 5V-0.7V=4.3V.Because no matter lithium battery E voltage is fully charged or non-fill
When full state, SW2 left side point voltage 4.3V are below switched.So what the first light emitting diode D1 was off, charging valve
Manage chip U1 normal to lithium battery E chargings.
If the first light emitting diode D1, the second light emitting diode D2 and LDO low pressure difference linear voltage regulator U2 are directly connect
On BAT pins 3, then erroneous judgement can be produced, it may appear that connect 5V external power supply when charging management chip U1 is powered,
But lithium battery E will not be charged, charging management chip U1 LED light is not also right, the LDO low pressure difference linearities voltage stabilizing
Device U2 will not also obtain normal input voltage（Input voltage very little）.In this case, the circuit design of the present embodiment, will
VDD pins 4 and the short circuit of BAT pins 3 link together so that institute is stateful to recover normal, can charge normal, LDO low voltage difference lines
Property voltage-stablizer U2 also can normal work.
The moment of electricity is connected in charging management chip U1, BAT state is detected, by LDO low pressure difference linear voltage regulators U2
Input pin be also connected to BAT pins 3 and lithium battery E positive poles connection road on, the work shape of BAT pins 3 can be influenceed
State, causes charging management chip U1 to enter the trickle charge stage, and the present embodiment is due to by by VDD pins 4 and BAT pins 3
Short circuit links together, and makes the enforceable rise of voltage of BAT pins 3, charging management chip U1 is judged as that lithium battery E enters
Constant-current charging phase, so output high current, can drive LDO low pressure difference linear voltage regulators U2.
The first light emitting diode D1 and the second light emitting diode D2 should be from the small diode of pressure drop, such as pole of germanium two
Pipe, Schottky diode, switch mosfet pipe.Preferably, from Schottky diode, its forward voltage drop is arrived between 300mV
Between 500mV.But to some battery switching circuits, even if selection Schottky diode can not meet design requirement.For one
For individual efficient electric pressure converter, the part energy saved may completely be slatterned by the forward voltage drop of diode.
In order to effectively preserve the energy content of battery in low-voltage system, it should select power mosfet switch to substitute diode.Sealed using SOT
Dress, conducting resistance only have the MOSFET of tens milliohms, and its conduction voltage drop can be ignored under the current level of portable product.
MOSFET carrys out Switching power, and preferably N, MOSFET conduction voltage drops and cell voltage are compared
Compared with the ratio of pressure drop and cell voltage is regarded as loss in efficiency.For example, the pole of Schottky two that a forward voltage drop is 350mV
Pipe is used for switching Li+ batteries（Nominal value 3.6V）, loss is then 9.7%, if for switching two section AA batteries（Nominal value
2.7V）, lose as 13%.In low-cost design, these losses can also may receive.But, it is efficient when having used
It is necessary to weighing DC-DC cost and diode is upgraded to the cost for the improved efficiency that MOSFET is brought during DC-DC.
Lithium battery is under normal temperature state, when consuming 90% electricity, and voltage still can be maintained at 3.5V or so, choosing
A better LDO devices is selected so when 3.5V, output voltage still can be stablized in 3.3V, and the present embodiment is described
LDO low pressure difference linear voltage regulators U2 uses RT9193-3.3V, makes lithium battery E output voltage stabilization in 3.3V.
Preferred embodiment of the present utility model is these are only, the utility model is not limited to, it is all in this practicality
Any modification, equivalent and improvement made within new spirit and principle etc., should be included in guarantor of the present utility model
Within the scope of shield.
Claims (6)
1. a kind of lithium battery charging management circuit, it is characterised in that：Including the input circuit by offer charge power supply, Charge Management
Circuit and the output circuit composition being connected with lithium battery, the input circuit connect charge management circuit, the Charge Management electricity
Road connects output circuit, and the charge management circuit includes charging management chip, the first light emitting diode and the second light-emitting diodes
Pipe, the BAT pins and VDD pins of the charging management chip and connect respectively first light emitting diode and second light two
The positive pole of pole pipe, the negative pole of first light emitting diode is connected with the negative pole of the second light emitting diode, the output circuit bag
LDO low pressure difference linear voltage regulators are included, the LDO low pressure difference linear voltage regulators pass through the first light emitting diode and the Charge Management
The BAT pins connection of chip, provided with switch between first light emitting diode and LDO low pressure difference linear voltage regulators.
2. a kind of lithium battery charging management circuit according to claim 1, it is characterised in that：The LDO low pressure difference linearities
Voltage-stablizer uses RT9193-3.3V, makes the output voltage stabilization of lithium battery in 3.3V.
3. a kind of lithium battery charging management circuit according to claim 1, it is characterised in that：First light emitting diode
Germanium diode or Schottky diode or switch mosfet pipe are used with the second light emitting diode.
4. a kind of lithium battery charging management circuit according to claim 1, it is characterised in that：The charging management chip
VDD pins and STAT pins are additionally provided with charging indication, and the charging indication includes two LED lights.
5. a kind of lithium battery charging management circuit according to claim 1, it is characterised in that：The charging management chip is adopted
Use MCP73831.
6. a kind of lithium battery charging management circuit according to claim 1, it is characterised in that：The charge power supply uses 5V
External power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621091621.6U CN206332464U (en) | 2016-09-29 | 2016-09-29 | A kind of lithium battery charging management circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621091621.6U CN206332464U (en) | 2016-09-29 | 2016-09-29 | A kind of lithium battery charging management circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206332464U true CN206332464U (en) | 2017-07-14 |
Family
ID=59286931
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621091621.6U Expired - Fee Related CN206332464U (en) | 2016-09-29 | 2016-09-29 | A kind of lithium battery charging management circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206332464U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107657307A (en) * | 2017-10-24 | 2018-02-02 | 王阳 | Bluetooth electronic tag system and localization method |
| CN111198512A (en) * | 2020-03-12 | 2020-05-26 | 辽宁众联石油天然气有限公司 | Parameter simulator |
| CN112947735A (en) * | 2021-02-04 | 2021-06-11 | 浪潮电子信息产业股份有限公司 | Power supply circuit of server clock chip and server |
-
2016
- 2016-09-29 CN CN201621091621.6U patent/CN206332464U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107657307A (en) * | 2017-10-24 | 2018-02-02 | 王阳 | Bluetooth electronic tag system and localization method |
| CN111198512A (en) * | 2020-03-12 | 2020-05-26 | 辽宁众联石油天然气有限公司 | Parameter simulator |
| CN112947735A (en) * | 2021-02-04 | 2021-06-11 | 浪潮电子信息产业股份有限公司 | Power supply circuit of server clock chip and server |
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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: 20170714 Termination date: 20190929 |
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| CF01 | Termination of patent right due to non-payment of annual fee |