CN207939226U - A kind of charging control circuit and a kind of charging power device - Google Patents
A kind of charging control circuit and a kind of charging power device Download PDFInfo
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- CN207939226U CN207939226U CN201820127455.3U CN201820127455U CN207939226U CN 207939226 U CN207939226 U CN 207939226U CN 201820127455 U CN201820127455 U CN 201820127455U CN 207939226 U CN207939226 U CN 207939226U
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Abstract
The utility model discloses a kind of a kind of charging power devices of charging control circuit.The charging control circuit, including voltage conversion circuit, sampling resistor, amplifying circuit and control circuit；The input of voltage conversion circuit terminates charge power supply, will be exported to charging equipment through output end after the voltage transformation of charge power supply；Sampling resistor is connected on the output end of voltage conversion circuit；Amplifying circuit connects the both ends of sampling resistor, and the output end of amplifying circuit is connect with control circuit, and amplifying circuit acquires the voltage drop on sampling resistor, and output is to control circuit after voltage drop is amplified；The Enable Pin of the control terminal connection voltage conversion circuit of control circuit, voltage conversion circuit is closed when being not more than preset value with voltage drop after amplification.By the way that sampling resistor and amplifying circuit are arranged in the charge circuit, charge cutoff is controlled by the fall voltage signal of amplification, solves the problems, such as that the too small cause of script charging current is undetectable, level of charge higher improves the cruising ability of electrical equipment.
Description
Technical field
The utility model is related to a kind of charging control circuits and a kind of charging power device.
Background technology
Currently, portable electronic equipment such as mobile phone, bluetooth headset etc. provided for daily life it is very big convenient.
However, in the prior art, when charging for these portable devices, charging circuit usually only uses resistance and builds, and cannot achieve
Accurate detection to charging currents such as earphones.For example, since detection error is larger, precision is limited, about exists in charging current
15mA, which just ends, not to charge to earphone, causes earphone that can not be full of.And with the continuous renewal of the portable products such as new earphone
Regenerate, the requirement for charging is also higher and higher, especially because earphone increasingly minimizes, only battery volume capacity first,
The problem of earphone air time can be caused to fall short of, is discontented in charging, influences normal use.
Accordingly, it is desirable to provide a kind of scheme that can more accurately detect charging current, to be full of as far as possible to earphone
Electricity ensures the air time.
Utility model content
Inaccurate in view of the detection of the portable devices charging current such as prior art earphone, the problem for causing charging discontented carries
A kind of charging control circuit of the utility model and a kind of charging power device are gone out.
To achieve the goals above, the utility model uses following technical solution：
According to the one side of the utility model, a kind of charging control circuit, including voltage conversion circuit, sampling are provided
Resistance, amplifying circuit and control circuit；
The input of the voltage conversion circuit terminates charge power supply, by after the voltage transformation of the charge power supply through output end
It exports to charging equipment；
The sampling resistor is connected on the output end of the voltage conversion circuit；
The amplifying circuit connects the both ends of the sampling resistor, the output end of the amplifying circuit and the control circuit
Connection, the amplifying circuit acquire the voltage drop on the sampling resistor, and output is to the control after the voltage drop is amplified
Circuit；
The control terminal of the control circuit connects the Enable Pin of the voltage conversion circuit, in the amplified voltage
The voltage conversion circuit is closed when drop is no more than preset value.
Optionally, the charging control circuit further includes the first capacitance, the second capacitance, third capacitance and the 4th capacitance, institute
It states the first capacitance and second capacitance is connected in parallel between the input terminal and ground of the voltage conversion circuit, the third electricity
Hold and the 4th capacitance is connected in parallel between the output end and ground of the voltage conversion circuit；First capacitance and described
The capacitance of second capacitance is different, and the third capacitance is different with the capacitance of the 4th capacitance.
Optionally, the voltage conversion circuit includes DC-DC boost chips, inductance, first resistor, second resistance and third
Resistance；
The power input of the DC-DC boost chips terminates the charge power supply, and the inductance connection is in the DC-DC liters
It presses between the power input of chip and boosting rectifier switch input terminal, described in the Enable Pin connection of the DC-DC boost chips
The control terminal of control circuit, and pull down and be grounded through first resistor；The output end of the DC-DC boost chips is by concatenated second electricity
Resistance and 3rd resistor ground connection, the feedback of the DC-DC boost chips are connected to the connecting pin of the second resistance and 3rd resistor.
Optionally, the sampling resistor is precision resister of the resistance accuracy 1% or more.
Optionally, the charging control circuit further includes the 5th capacitance and the 6th capacitance, the 5th capacitance and the 6th electricity
Appearance is connected in parallel between the sampling resistor and the connecting pin and ground of the voltage conversion circuit, the 5th capacitance and described
6th capacitor's capacity is different.
Optionally, the amplifying circuit includes amplification chip and the 5th resistance；Two input terminals of the amplification chip point
It is not connected on the both ends of the sampling resistor, the output end of the amplification chip is the output end of the amplifying circuit；Described 5th
Resistance is connected between the output end and ground of the amplification chip.
Optionally, the amplification chip is INA216 chips, and voltage drop amplification factor is 25,50,100 or 200.
Optionally, the amplifying circuit includes the 7th capacitance, output of the 7th capacitance connection in the amplifying circuit
Between end and ground.
Optionally, the amplifying circuit further includes the 6th resistance, and the 6th resistance is connected on the defeated of the amplifying circuit
Between outlet and the control circuit.
According to the other side of the utility model, a kind of charging power device is provided, is set in the charging power device
It is equipped with any one of them charging control circuit as above.
In conclusion the utility model has the beneficial effects that：
Sampling resistor and amplifying circuit are set in the charge circuit, the voltage at sampling resistor both ends is obtained using amplifying circuit
It drops and amplifies, and then the amplified voltage drop is received as detected value by control circuit, control charge cutoff, solve originally
Charging current is too small to lead to not the problem of detection uses, to reach in the inaccessiable smaller charging current of current detecting institute
The effect that charge cutoff is controlled under state, gives electrical equipment fully charged as far as possible, improves cruising ability.
Description of the drawings
Fig. 1 is a kind of charging control circuit structural schematic diagram that the utility model one embodiment provides；
Fig. 2 is a kind of circuit connection diagram for charging control circuit that the utility model one embodiment provides.
Specific implementation mode
It is new to this practicality below in conjunction with attached drawing to keep the purpose of this utility model, technical solution and advantage clearer
Type embodiment is described in further detail.
The technical concept of the utility model is：Sampling resistor and amplifying circuit, sampling resistor string are set in the charge circuit
It is associated on charging circuit, amplifying circuit acquires the voltage drop at sampling resistor both ends and amplification, and it is amplified that control circuit receives this
Voltage drop is as detected value, to control charge cutoff, solves the problems, such as that script charging current is too small and leads to not detection use,
To achieve the effect that control charge cutoff under smaller current state of charge, gives electrical equipment fully charged as far as possible, improve
Cruising ability.
Fig. 1 schematically shows the structural schematic diagram of the utility model charging control circuit, as shown in Figure 1, one kind is filled
Electric control circuit, including voltage conversion circuit 110, sampling resistor 120, amplifying circuit 130 and control circuit 130.
The input of voltage conversion circuit 110 terminates charge power supply, will be exported through output end after the voltage transformation of charge power supply
To charging equipment.
Sampling resistor 120 is connected on the output end of voltage conversion circuit 110.Amplifying circuit 130 connects sampling resistor 120
Both ends, the output end of amplifying circuit 130 connect with control circuit 140, and amplifying circuit 130 acquires the electricity on sampling resistor 120
Pressure drop, output is to control circuit 140 after voltage drop is amplified.In some embodiments of the utility model, sampling resistor 120 is
Precision resister of the precision 1% or more detects charging current with precise acquisition, improves the control accuracy of charge cutoff electric current.
The Enable Pin of the control terminal connection voltage conversion circuit 110 of control circuit 140, it is little with voltage drop after amplification
Voltage conversion circuit 110 is closed when preset value.Because charging current is to increase and reduce with level of charge, when control
When circuit 140 judges that amplified voltage drop is not more than preset value, it is known that charging current has reached sufficiently small, and charging has reached
The degree being full of enough stops charging to which control circuit 140 closes voltage conversion circuit 110.Wherein, control circuit 140 can
To be realized by electronic components such as voltage comparators, alternatively, control circuit 140 can also be realized using MCU controllers,
In this case, the amplified fall voltage signal is output to the analog-to-digital conversion sampling end of MCU controllers, such as Fig. 2 circuit connection diagrams
It is shown.
Due to this charging control circuit embodiment not instead of not directly detection charging current, obtained by amplifying circuit 130
The voltage drop and amplification of sampling resistor 120 are sent to control circuit 140 as detected value, to be put by the acquisition of voltage drop
Greatly, it solves the problems, such as that script charging current is too small and leads to not detection, so that charging process can be in smaller charging current
Lower cut-off, it is as fully charged to portable equipments such as earphones as possible, improve the cruising ability of portable equipment.Compared to passing through resistance merely
The charging of higher precision may be implemented by the cooperation of amplifying circuit 130 and sampling resistor 120 in the current detection circuit built
Control improves the level of charge to electrical equipment, improves cruising ability.
Fig. 2 is a kind of circuit connection diagram for charging control circuit that the utility model one embodiment provides, wherein
Sampling resistor 120 is resistance R4, and amplifying circuit 130 includes amplification chip U6 and peripheral resistance capacitance, two of amplification chip U6
Input terminal IN+ and IN- are connected to the both ends of sampling resistor R4.
As shown in Fig. 2, the charging control circuit further includes the first capacitance C1, the second capacitance C2, third capacitance C3 and the 4th
Capacitance C4, the first capacitance C1 and the second capacitance C2 are connected in parallel between the input terminal and ground of voltage conversion circuit 110, third electricity
Hold C3 and the 4th capacitance C4 to be connected in parallel between the output end and ground of voltage conversion circuit 110.Wherein, the first capacitance C1 and
The capacitance of two capacitance C2 is different, and the capacitance of third capacitance C3 and the 4th capacitance C4 are different, so as to respectively to different frequency
Interference signal is filtered, to improve the stability of input power and out-put supply.
Voltage conversion circuit 110 includes DC-DC boost chips U4, inductance L1, first resistor R1, second resistance R2 and third
Resistance R3.
Wherein, the power input VBAT of DC-DC boost chips U4 connects charge power supply, and inductance L1 is connected to DC-DC boostings
Between the power input VBAT and boosting rectifier switch input terminal SW of chip U4.The Enable Pin EN of DC-DC boost chips U4 connects
The control terminal UC_EN of connection control circuit 140, and through first resistor drop-down R1 ground connection.The output end VOUT warps of DC-DC boost chips
By concatenated second resistance R2 and 3rd resistor R3 ground connection, the feedback end FB of DC-DC boost chips U4 be connected to second resistance R2 and
The connecting pin of 3rd resistor R3.
The Enable Pin of DC-DC boost chips U4 is through first resistor R1 drop-down ground connection, to defeated in control terminal UC_EN no signals
Drop-down is stable low level when going out, and prevents voltage dithering from causing accidentally to touch.
In circuit shown in Fig. 2, DC-DC boost chips are TPS61070 chips.TPS61070 be it is a have it is 90% high
The synchronous pressure-boosting converter of efficiency is worked normally when Enable Pin EN connects high level, it is possible to provide the up to output voltage of 5.5V.Such as
Shown in Fig. 2, the adjusting of output voltage is realized by the resitstance voltage divider of second resistance R2 and 3rd resistor R3 compositions, in this practicality
In some novel embodiments, second resistance R2 and 3rd resistor R3 are all made of precision resister of the precision 1% or more, to carry
The accuracy of high output voltage adjustment.
As shown in Fig. 2 circuit connection diagrams, which further includes the 5th capacitance C5 and the 6th capacitance C6, the 5th electricity
Hold C5 and the 6th capacitance C6 to be connected in parallel between sampling resistor R4 and the connecting pin and ground of voltage conversion circuit 110, the 5th electricity
Hold C5 and the 6th capacitance C6 capacitances are different, the ripple to filter out different frequency interferes, and further increases the stability of output voltage.
In some embodiments of the utility model, amplifying circuit 130 includes amplification chip U6 and the 5th resistance R5, amplification
Two input terminals of chip U6 are connected on the both ends of sampling resistor R4 respectively, and the output end OUT of amplification chip U6 is amplifying circuit 130
Output end；5th resistance R5 is connected between the output end OUT of amplification chip U6 and ground, when no charging current is for detection,
The output end OUT drop-downs of amplifying circuit U6 are stable low level by the 5th resistance R5, are avoided dry to the output of control circuit 140
Disturb signal.
In some embodiments of the utility model, amplification chip U6 is INA216 chips, and voltage drop amplification factor is
25,50,100 or 200.In the circuit connection diagram shown in this Fig. 2, which is charging bluetooth earphone, and sampling resistor R4 is
The voltage drop amplification factor of the precision resister of 200m ohm of resistance value, precision 1%, amplification chip U6 is 25.Certainly, according to difference
Charge requirement, being adapted to property adjusts the voltage drop amplification factor of the resistance value and amplification chip U6 of sampling resistor R4, to adapt to
The demand of the difference electrical equipment such as bluetooth headset, smart mobile phone.
In some embodiments of the utility model, amplifying circuit 130 further includes the 7th capacitance C7, the 7th capacitance C7 connections
Between the output end and ground of amplifying circuit 130, i.e., between the output end OUT of amplification chip U6 and ground, for filtering out ripple punching
It hits, when preventing charging from starting, the fall voltage signal that generates suddenly is to the input terminal of control circuit 140, such as the modulus sampling end of MCU
Voltge surge is caused, damage MCU is avoided.
In some embodiments of the utility model, amplifying circuit 130 further includes the 6th resistance R6, the 6th resistance R6 series connection
Between the output end and control circuit 140 of amplifying circuit, i.e., between the output end OUT of amplification chip U6 and control circuit 140,
It to carry out current limliting, prevents amplified voltage drop excessively high, generates excessive electric current, endanger MCU.
In conjunction with Fig. 2, the operation principle for specifically introducing this circuit is as follows：
Charge power supply VBAT is the battery supply of 3.3V to 4.2V, is charged to charging equipment after being boosted by U4, and profit
With the size of R4 on VHS+ circuits detection charging current synchronous with U6, size control U4 beats on and off according to testing result
It closes.
When charging normal, charging current is larger, and detected value is more than preset value, and MCU is enabled by control terminal UC_EN at this time
3 feet of (drawing high level) U4, charge power supply VBAT are input to 6 foot of power input foot of U4 after the filtering of C1 and C2
VBAT, to which 5 foot of output pin of U4 has output, specific output voltage is 4.81V.Output voltage passes through capacitance C3, C4, C5
It filters with C6, charges to charging equipment using output after sampling resistor R4.1,3 foot of input pin of U6 acquires the both ends R4 in real time
Voltage, the voltage of acquisition exports the ADC pins to MCU for the real-time collection voltages of MCU through 25 times of inside amplification.MCU will be acquired
To analog signal be converted to digital signal and be compared with preset value, so that it is determined that whether charging current down to default water
It is flat, that is, whether completely to charge.Specifically, pass through simple Ohm's law conversion relation, so that it may convert using collected voltage
Go out to flow through the electric current of R4, such as the ICE_SENSE voltages that detect of ADC pins of MCU are 0.5V, and charging current is obtained after conversion
For：(0.5V/25)/0.2 Ω=0.1A=100mA.It in practice, can be preset by ending in MCU in order to simplify calculating process
Voltage preset value after electric current conversion, to directly compared with collected voltage value.For example, in order to be full of as far as possible to earphone
Smaller charge cutoff electric current, such as 5mA, due to 5mA*200m Ω * 25=25mV, as long as detecting ICE_ is arranged in electricity
The voltage of SENSE feedbacks reaches 25mV or smaller, and just 3 foot of enabled foot of U4 is dragged down and (do not enabled) by UC_EN, U4 is made to stop
Only boost charge directly detects charging current to reach the purpose of design that control charging ends in 5mA electric currents compared to current
Cause precision not high, the charge control method that charging current is ended in 15mA can only be controlled, it is more complete to the charging of electrical equipment,
Cruising ability can be effectively improved, and this charge control mode also needs not rely on the charge control core of detection cell voltage
Piece, cost is lower, and applicability is wider.
The invention also discloses a kind of charging power device, any one as above is provided in the charging power device
Charging control circuit ends charging so as to precisely control charging process under smaller charging current, improves charging
Amount, which can be power supply adaptor, can also be charger baby etc..
Above description is only a specific implementation of the present invention, under the above-mentioned introduction of the utility model, this field
Technical staff can carry out other improvement or deformation on the basis of the above embodiments.It will be understood by those skilled in the art that
Above-mentioned specific descriptions only preferably explain the purpose of this utility model, and the scope of protection of the utility model should be with claim
Protection domain subject to.
Claims (10)
1. a kind of charging control circuit, which is characterized in that including voltage conversion circuit, sampling resistor, amplifying circuit and control electricity
Road；
The input of the voltage conversion circuit terminates charge power supply, will be exported through output end after the voltage transformation of the charge power supply
To charging equipment；
The sampling resistor is connected on the output end of the voltage conversion circuit；
The amplifying circuit connects the both ends of the sampling resistor, and the output end of the amplifying circuit connects with the control circuit
It connects, the amplifying circuit acquires the voltage drop on the sampling resistor, and output is electric to the control after the voltage drop is amplified
Road；
The control terminal of the control circuit connects the Enable Pin of the voltage conversion circuit, with the amplified voltage drop not
The voltage conversion circuit is closed when more than preset value.
2. charging control circuit according to claim 1, which is characterized in that the charging control circuit further includes the first electricity
Appearance, the second capacitance, third capacitance and the 4th capacitance, first capacitance and second capacitance are connected in the voltage in parallel and become
It changes between the input terminal of circuit and ground, the third capacitance and the 4th capacitance are connected in the voltage conversion circuit in parallel
Between output end and ground；First capacitance is different with the capacitance of second capacitance, the third capacitance and the 4th electricity
The capacitance of appearance is different.
3. charging control circuit according to claim 1, which is characterized in that the voltage conversion circuit includes DC-DC liters
Press chip, inductance, first resistor, second resistance and 3rd resistor；
The power input of the DC-DC boost chips terminates the charge power supply, and the inductance connection is in DC-DC boosting cores
Between the power input and boosting rectifier switch input terminal of piece, the Enable Pin of the DC-DC boost chips connects the control
The control terminal of circuit, and pull down and be grounded through first resistor；The output end of the DC-DC boost chips by concatenated second resistance and
3rd resistor is grounded, and the feedback of the DC-DC boost chips is connected to the connecting pin of the second resistance and 3rd resistor.
4. charging control circuit according to claim 1, which is characterized in that the sampling resistor is resistance accuracy 1%
Above precision resister.
5. charging control circuit according to claim 1, which is characterized in that the charging control circuit further includes the 5th electricity
Hold and the 6th capacitance, the 5th capacitance and the 6th capacitance are connected in the sampling resistor and the voltage conversion circuit in parallel
Between connecting pin and ground, the 5th capacitance and the 6th capacitor's capacity difference.
6. charging control circuit according to claim 1, which is characterized in that the amplifying circuit includes amplification chip and
Five resistance；Two input terminals of the amplification chip are connected on the both ends of the sampling resistor, the output of the amplification chip respectively
End is the output end of the amplifying circuit；5th resistance is connected between the output end and ground of the amplification chip.
7. charging control circuit according to claim 6, which is characterized in that the amplification chip is INA216 chips,
Voltage drop amplification factor is 25,50,100 or 200.
8. charging control circuit according to claim 1, which is characterized in that the amplifying circuit includes the 7th capacitance, institute
The 7th capacitance connection is stated between the output end and ground of the amplifying circuit.
9. charging control circuit according to claim 1, which is characterized in that the amplifying circuit further includes the 6th resistance,
6th resistance is connected between the output end of the amplifying circuit and the control circuit.
10. a kind of charging power device, which is characterized in that be arranged just like any one of claim 1-9 in the charging power device
The charging control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820127455.3U CN207939226U (en) | 2018-01-24 | 2018-01-24 | A kind of charging control circuit and a kind of charging power device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820127455.3U CN207939226U (en) | 2018-01-24 | 2018-01-24 | A kind of charging control circuit and a kind of charging power device |
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| Publication Number | Publication Date |
|---|---|
| CN207939226U true CN207939226U (en) | 2018-10-02 |
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ID=63650101
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820127455.3U Active CN207939226U (en) | 2018-01-24 | 2018-01-24 | A kind of charging control circuit and a kind of charging power device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108054810A (en) * | 2018-01-24 | 2018-05-18 | 歌尔科技有限公司 | A kind of charging control circuit and a kind of charging power device |
-
2018
- 2018-01-24 CN CN201820127455.3U patent/CN207939226U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108054810A (en) * | 2018-01-24 | 2018-05-18 | 歌尔科技有限公司 | A kind of charging control circuit and a kind of charging power device |
| CN108054810B (en) * | 2018-01-24 | 2024-01-30 | 歌尔科技有限公司 | Charging control circuit and charging power supply equipment |
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