CN207910531U - A kind of charging current configuration circuit that periphery is simplified - Google Patents
A kind of charging current configuration circuit that periphery is simplified Download PDFInfo
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- CN207910531U CN207910531U CN201820329142.6U CN201820329142U CN207910531U CN 207910531 U CN207910531 U CN 207910531U CN 201820329142 U CN201820329142 U CN 201820329142U CN 207910531 U CN207910531 U CN 207910531U
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Abstract
The utility model provides a kind of at low cost, easy to use, charging current configuration circuit, belongs to electronic circuit field.The charging current configuration circuit that a kind of periphery of the utility model is simplified, the circuit realize that the charging management chip further includes pin status detection circuit and charging current setting circuit based on charging management chip；The state of pin is arranged in pin status detection circuit, the charging current for detecting charging management chip, and the state includes hanging, is grounded and connects input voltage VIN；The status signal that pin is arranged in charging current by the pin status detection circuit of the utility model is converted to digital signal.Circuit is arranged in charging current, for according to the pin status detected, adjusting output current；The current output circuit of charging management chip exports the electric current after adjustment to charging equipment.
Description
Technical field
The utility model is related to a kind of charging current configuration circuit, more particularly to a kind of charging current that periphery is simplified configuration
Circuit belongs to electronic circuit field.
Background technology
With popularizing for lithium battery, the demand to lithium battery Charge Management is also more and more vigorous.Lithium battery charging needs to accord with
Close trickle, constant current, constant pressure three stage charging system specification, such as Fig. 1.I.e. when cell voltage is less than 2.9V, carries out low current trickle and fill
Electricity；In voltage higher than after 2.9V, high current constant current quick charge is carried out；Reach in voltage, is (different depending on battery material close to 4.2V
And different) when, constant-voltage charge is carried out, electric current continuously decreases until being full of.It is safe to ensure to charge with this, while battery being protected to make
Use the service life.
Demand due to different equipment to lithium battery capacity is different, for example powerful Bluetooth speaker needs large capacity electric
Pond；Shaver only needs small-capacity cells.Also different to the charge-current demands of different capabilities battery, large capacity low current fills
Electricity, then the charging time is long；, then there is security risk in low capacity large current charge.Therefore it after selected battery capacity, also needs to set
Charging current is set, charging current, such as Fig. 2 is arranged by peripheral resistance in existing chip.R in figureSETResistance charges for being arranged
Electric current, it is smaller that resistance value gets over high current, otherwise electric current is bigger；In addition, the resistance must be precision resistance, and it is of high cost, by changing electricity
The mode that resistance obtains charging current is more complex.
Invention content
Against the above deficiency, the utility model provides a kind of at low cost, easy to use, charging current configuration circuit.
The charging current configuration circuit that a kind of periphery of the utility model is simplified, it is real which is based on charging management chip
Existing, the charging management chip further includes pin status detection circuit and charging current setting circuit；
The state of pin, the shape is arranged in pin status detection circuit, the charging current for detecting charging management chip
State includes hanging, is grounded and connects input voltage VIN；
Circuit is arranged in charging current, for according to the pin status detected, adjusting output current；
The current output circuit of charging management chip exports the electric current after adjustment to charging equipment.
Preferably, the status signal of charging current setting pin is converted to digital letter by the pin status detection circuit
Number.
Preferably, the pin status detection circuit includes resistance R1, resistance R2, the first current source I1, the second current source
I2, third current source I3, the 4th current source I4, the first buffer and the second buffer；
Resistance R1One end and resistance R2One end connection, and connect simultaneously charging management chip charging current setting pipe
Foot；Resistance R1The other end, the first current source I1Cathode, the second current source I2Anode and the first buffer input terminal it is same
When connect；
Resistance R2The other end, third current source I3Cathode, the 4th current source I4Anode and the second buffer input
It holds while connecting；
First current source I1Anode and third current source I3Anode simultaneously with power supply anode connect；
Second current source I2Cathode and the 4th current source I4Cathode simultaneously connect with the cathode of power supply；
First current source I1The electric current of output is the second current source I22 times, the 4th current source I4The electric current of output is third
Current source I32 times；
Number is obtained according to the level height of the output end O2 outputs of the output end O1 of the first buffer and the second buffer
Signal.
Preferably, charging current setting circuit is to when the output end O1 outputs high level of the first buffer, the
The output end O2 of two buffers exports low level, the first charging current is provided；
Circuit is arranged to export the output of low level, the second buffer as the output end O1 of the first buffer in charging current
It holds O2 to export low level, second of charging current is provided；
Circuit is arranged to export the output of high level, the second buffer as the output end O1 of the first buffer in charging current
It holds O2 to export high level, the third charging current is provided.
Above-mentioned technical characteristic may be combined in various suitable ways or be substituted by equivalent technical characteristic, as long as can reach
To the purpose of this utility model.
The beneficial effects of the utility model are that the utility model replaces outer connecting resistance using pin status detection circuit
Charging current configuration mode so that system is more simplified, and cost is lower；The utility model is simply and reliablely by charging management chip
The condition conversion that pin is arranged in charging current is digital information.The utility model is that a kind of configuration technology easy to use is electric in lithium
Application on the charge integrated circuit chip of pond realizes that the circuit makes the configuration of lithium battery charging current break away to periphery configuration
The demand of resistance reduces overall cost, while improving the property easy to use of configuration.The utility model passes through simply to core
The pin of piece carries out floating, is grounded, connects high voltage, you can realizes the selection of three kinds of charging currents.
Description of the drawings
Fig. 1 is the current curve schematic diagram of lithium battery charging specifications；
Fig. 2 is the electrical structure schematic diagram of existing charging current configuration circuit；
Fig. 3 is the electrical structure schematic diagram for the charging current configuration circuit that the periphery of present embodiment is simplified；
Fig. 4 is the principle schematic that charging current is arranged in present embodiment；
Fig. 5 is the electrical structure schematic diagram of pin status detection circuit.
Specific implementation mode
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 in the premise for not making creative work
Lower obtained every other embodiment, shall fall within the protection scope of the present invention.
It should be noted that in the absence of conflict, the feature in the embodiments of the present invention and embodiment can
To be combined with each other.
The utility model is described in further detail in the following with reference to the drawings and specific embodiments, but not as the utility model
It limits.
Illustrate present embodiment in conjunction with Fig. 3, Fig. 4 and Fig. 5, the charging current that a kind of periphery of present embodiment is simplified configures
Circuit, the circuit realize that the charging management chip further includes pin status detection circuit and charging based on charging management chip
Current setting circuit；
The state of pin, the shape is arranged in pin status detection circuit, the charging current for detecting charging management chip
State includes hanging, is grounded and connects input voltage VIN；
Circuit is arranged in charging current, for according to the pin status detected, adjusting output current；
Electric current after adjustment is exported and gives charging equipment C by the current output circuit of charging management chipBAT。
In present embodiment, the current output circuit of charging management chip is responsible for output and the stabilization of charging current；
Present embodiment saves the resistance being arranged in existing Fig. 2, and such as Fig. 3, charging electricity is arranged by charging management chip
Stream corresponding pin connect high voltage, charging current is arranged in ground connection, floating state.
In preferred embodiment, the status signal that pin is arranged in charging current by pin status detection circuit is converted to digital letter
Number, present embodiment pin status detection circuit includes resistance R1, resistance R2, the first current source I1, the second current source I2, third
Current source I3, the 4th current source I4, the first buffer and the second buffer；
Resistance R1One end and resistance R2One end connection, and connect simultaneously charging management chip charging current setting pipe
Foot；Resistance R1The other end, the first current source I1Cathode, the second current source I2Anode and the first buffer input terminal it is same
When connect；
Resistance R2The other end, third current source I3Cathode, the 4th current source I4Anode and the second buffer input
It holds while connecting；
First current source I1Anode and third current source I3Anode simultaneously with power supply anode connect；
Second current source I2Cathode and the 4th current source I4Cathode simultaneously connect with the cathode of power supply；
First current source I1The electric current of output is the second current source I22 times, the 4th current source I4The electric current of output is third
Current source I32 times；
Number is obtained according to the level height of the output end O2 outputs of the output end O1 of the first buffer and the second buffer
Signal.
As shown in figure 5, left tubing feet is hanging, pull-up current is more than pull-down current in left current branch at this time, by the
One buffer makes O1 export high level；And pull-up current is less than drop-down in right current branch, makes by the second buffer
O2 exports low level；
Left tubing feet is grounded, and two branches are all that pull-down current is stronger at this time, and O1 and O2 export low level；
Left tubing feet connects high voltage, and two branches are all that pull-up current is stronger at this time, and O1 and O2 export high level；
| Pin status | O1 | O2 |
| Vacantly | It is high | It is low |
| Ground connection | It is low | It is low |
| Connect height | It is high | It is high |
Pin status is arranged in charging current and the logical relation of output signal is seen the above table, and thus charging current is arranged and manages
The condition conversion of foot is for digital signal, the size for configuring charging current to late-class circuit.
Pin status detection circuit and charging current setting circuit is arranged in present embodiment inside charging management chip, can
Identify the different conditions of the pin, it is then corresponding to change charging current.
In preferred embodiment, as shown in figure 3, the charging current setting circuit of present embodiment is to when the first buffer
Output end O1 exports high level, the output end O2 of the second buffer exports the charging current that 320mA is provided in low level；
Circuit is arranged to export the output of low level, the second buffer as the output end O1 of the first buffer in charging current
It holds O2 to export low level, the charging current of 500mA is provided；
Circuit is arranged to export the output of high level, the second buffer as the output end O1 of the first buffer in charging current
It holds O2 to export high level, the charging current of 100mA is provided.
Although describing the utility model herein with reference to specific embodiment, it should be understood that, this
A little embodiments are only the principles of the present invention and the example of application.It should therefore be understood that can be to illustrative real
It applies example and carries out many modifications, and can be designed that other arrangements, without departing from this reality as defined in the appended claims
With novel spirit and scope.It should be understood that can be combined by being different from mode described in original claim
Different dependent claims and feature described herein.It will also be appreciated that special in conjunction with described in separate embodiments
Sign can use in other embodiments.
Claims (4)
1. a kind of charging current configuration circuit that periphery is simplified, which is realized based on charging management chip, which is characterized in that institute
It further includes pin status detection circuit and charging current setting circuit to state charging management chip；
The state of pin, the state packet is arranged in pin status detection circuit, the charging current for detecting charging management chip
Include it is hanging, be grounded and connect input voltage VIN；
Circuit is arranged in charging current, for according to the pin status detected, adjusting output current；
The current output circuit of charging management chip exports the electric current after adjustment to charging equipment.
2. the charging current configuration circuit that periphery according to claim 1 is simplified, which is characterized in that the pin status inspection
The status signal that pin is arranged in charging current by slowdown monitoring circuit is converted to digital signal.
3. the charging current configuration circuit that periphery according to claim 2 is simplified, which is characterized in that the pin status inspection
Slowdown monitoring circuit includes resistance R1, resistance R2, the first current source I1, the second current source I2, third current source I3, the 4th current source I4,
One buffer and the second buffer；
Resistance R1One end and resistance R2One end connection, and connect simultaneously charging management chip charging current setting pin；Electricity
Hinder R1The other end, the first current source I1Cathode, the second current source I2Anode and the input terminal of the first buffer connect simultaneously
It connects；
Resistance R2The other end, third current source I3Cathode, the 4th current source I4Anode and the second buffer input terminal it is same
When connect；
First current source I1Anode and third current source I3Anode simultaneously with power supply anode connect；
Second current source I2Cathode and the 4th current source I4Cathode simultaneously connect with the cathode of power supply；
First current source I1The electric current of output is the second current source I22 times, the 4th current source I4The electric current of output is third electric current
Source I32 times；
Digital signal is obtained according to the level height of the output end O2 outputs of the output end O1 of the first buffer and the second buffer.
4. the charging current configuration circuit that periphery according to claim 3 is simplified, which is characterized in that the charging current is set
Circuits export high level to work as the output end O1 of the first buffer, the output end O2 of the second buffer exports low level, if
Set out the first charging current；
Circuit is arranged to as the output end O2 of the output end O1 outputs low level of the first buffer, the second buffer in charging current
Low level is exported, second of charging current is provided；
Circuit is arranged to as the output end O2 of the output end O1 outputs high level of the first buffer, the second buffer in charging current
High level is exported, the third charging current is provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820329142.6U CN207910531U (en) | 2018-03-11 | 2018-03-11 | A kind of charging current configuration circuit that periphery is simplified |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820329142.6U CN207910531U (en) | 2018-03-11 | 2018-03-11 | A kind of charging current configuration circuit that periphery is simplified |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207910531U true CN207910531U (en) | 2018-09-25 |
Family
ID=63558055
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820329142.6U Active CN207910531U (en) | 2018-03-11 | 2018-03-11 | A kind of charging current configuration circuit that periphery is simplified |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207910531U (en) |
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2018
- 2018-03-11 CN CN201820329142.6U patent/CN207910531U/en active Active
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