CN108306350B - Small battery charging method and device - Google Patents
Small battery charging method and device Download PDFInfo
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- CN108306350B CN108306350B CN201710241631.6A CN201710241631A CN108306350B CN 108306350 B CN108306350 B CN 108306350B CN 201710241631 A CN201710241631 A CN 201710241631A CN 108306350 B CN108306350 B CN 108306350B
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- 238000007600 charging Methods 0.000 title claims abstract description 309
- 238000000034 method Methods 0.000 title claims abstract description 32
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 74
- 238000006243 chemical reaction Methods 0.000 claims abstract description 30
- 238000001514 detection method Methods 0.000 claims description 18
- 238000010280 constant potential charging Methods 0.000 claims description 17
- 238000010277 constant-current charging Methods 0.000 claims description 15
- 238000002955 isolation Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 5
- 230000007423 decrease Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 229910052744 lithium Inorganic materials 0.000 description 5
- 230000001105 regulatory effect Effects 0.000 description 4
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010281 constant-current constant-voltage charging Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- H02J7/0077—
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
The application discloses a small battery charging method and a device thereof, wherein the method comprises the following steps: a first charging step: the power input unit charges the charging output unit through the charging management unit; when charging, detecting charging current output by a charging management unit, and when the charging current reaches a preset threshold value, stopping charging by the charging management unit and generating a control signal; a second charging step: the conversion control unit starts the voltage stabilizing unit according to the control signal, and the power input unit charges the charging output unit through the voltage stabilizing unit; during charging, the switching control unit controls the voltage stabilizing unit to stop charging. For small-current charging equipment, the battery can be fully charged to 4.2V, so that the situation that the conventional charging management chip cannot fully charge the battery to 4.2V is overcome, and the low-current charging can be realized, thereby improving the service efficiency of the small battery and solving the problem that the small battery equipment is small in capacity and is not fully charged.
Description
Technical Field
The application relates to the technical field of battery charging, in particular to a small battery charging method and a device thereof.
Background
In the existing charging mode of the lithium battery, when the charging voltage of the charging device rises to be close to the constant-voltage charging voltage under constant-voltage charging, the charging management unit judges whether to stop charging according to the detected charging current;
in the constant voltage charging process, the charging current gradually decreases, so that the charging current is generally set to be stopped when the charging current is smaller than the stopping current, and the charging is generally set to be stopped when the charging current reaches a certain percentage (such as 9.17%) of the constant current charging current;
one problem is that of: based on the above arrangement, the current stop of most lithium battery charging chips is usually larger than 20MA, and some of the current stop is even larger and cannot be set smaller; as a result, in the small battery power supply device, the charging current under constant current charging is originally small due to the small capacity of the battery, and the absolute current cannot be set smaller, so that the charging voltage cannot be charged to 4.2V after the small battery device is charged, and the small battery device cannot be fully charged; for example: in the current situation, in the 400MA lithium battery charging device, when the battery voltage is charged to 4.0V, the charging is stopped, so that the service capacity of the battery is greatly reduced.
The foregoing background is only for the purpose of providing an understanding of the inventive concepts and technical aspects of the present application and is not necessarily prior art to the present application and is not intended to be used as an aid in the evaluation of the novelty and creativity of the present application in the event that no clear evidence indicates that such is already disclosed at the date of filing of the present application.
Disclosure of Invention
The application aims to provide a small battery charging method and a device thereof, which are used for solving the technical problem that the small battery charging equipment in the prior art is not charged fully.
To this end, the present application proposes a small battery charging method, a first charging step: the power input unit charges the charging output unit through the charging management unit; when charging, detecting charging current output by the charging management unit, and when the charging current reaches a preset threshold value, stopping charging by the charging management unit and generating a control signal;
a second charging step: the conversion control unit starts the voltage stabilizing unit according to the control signal, and the power input unit charges the charging output unit through the voltage stabilizing unit; and during charging, the voltage stabilizing unit is controlled by the conversion control unit to stop charging.
Preferably, in the second charging step: the conversion control unit starts the voltage stabilizing unit through the voltage stabilizing starting unit, detects the charging voltage of the charging output unit through the voltage detecting unit, and stops charging through the turn-off control unit according to the action of the voltage detecting unit when the charging voltage reaches a preset threshold value.
Preferably, the first charging step includes: when the charging voltage of the charging output unit is not greater than a first voltage threshold value, the charging management unit is trickle charging; when the charging voltage of the charging output unit is not less than a first voltage threshold value, the charging management unit is constant-current charging; when the charging voltage of the charging output unit is close to the constant voltage charging voltage, the charging management unit is constant voltage charging.
Preferably, the method further comprises a step of indicating the operating state of the low-current charging method; and controlling the indicating unit to work through the conversion control unit.
Preferably, the first charging step and the second charging step are isolated by a voltage isolation unit to complete logic control of the charging output unit voltage.
In addition, the application also provides a small battery charging device, which comprises a power input unit, a charging output unit, a charging management unit, a voltage stabilizing unit and a conversion control unit, wherein the charging management unit and the voltage stabilizing unit are used for charging the charging output unit; the power input unit is connected with the charging management unit and the voltage stabilizing unit; the charging management unit comprises an input end, an output end and a control end; the input end is connected to the power input unit, and the output end is connected to the charging output unit; the conversion control unit comprises a control signal input end, a control output end, a power supply control end and a control feedback end, wherein the control signal input end is connected with the control end, the control output end is connected with the voltage stabilizing unit, the control feedback end is connected with the charging output unit, and the power supply control end is connected with the power supply input unit.
Preferably, the conversion control unit comprises a voltage stabilization starting unit, a turn-off control unit and a voltage detection unit; the voltage stabilizing starting unit is connected with the control signal input end and the power supply input end and is connected with the turn-off control unit; the voltage detection unit is connected with the control feedback end and the turn-off control unit; the turn-off control end is connected with the control output end.
Preferably, the device further comprises an indicating unit for indicating the charging state, and the switching control unit controls the indicating unit to perform indicating operation.
Preferably, the charging system further comprises a voltage isolation unit for isolating the charging management unit and the voltage stabilizing unit at the charging output unit.
The charging management unit includes a first charging unit for trickle charging, a second charging unit for constant current charging, and a third charging unit for constant voltage charging.
Compared with the prior art, the application has the beneficial effects that: the charging method and the charging device comprise a first charging step and a second charging step, wherein the first charging step is carried out by a charging management unit, when the charging management unit stops charging and generates a control signal when detecting that the charging current reaches a preset threshold value, then a conversion control unit switches to enter the second charging step according to the control signal to carry out charging, and the conversion control unit starts a voltage stabilizing unit to carry out charging and controls the voltage stabilizing unit to stop charging; compared with the existing charging method, the charging method has the advantages that in the first charging stage, the small battery can be basically charged, when the charging management unit stops charging due to smaller charging current, the charging management unit continuously generates a control signal, the control signal starts the conversion control unit to start the voltage stabilizing unit to continuously charge the small battery equipment, and in the charging process, the conversion control unit controls the voltage stabilizing unit to stop charging.
Through the charging method and the charging device, for small-current charging equipment, the battery can be fully charged to 4.2V, so that the situation that the conventional charging management chip cannot fully charge the battery to 4.2V is overcome, the low-current charging is realized, the service efficiency of the small battery is improved, and the problem that the small battery equipment is small in capacity and is not fully charged is solved.
Drawings
FIG. 1 is a block diagram of an embodiment of the present application;
FIG. 2 is a circuit topology of an embodiment of the present application;
FIG. 3 is an enlarged schematic diagram of a charging circuit management unit according to an embodiment of the present application;
FIG. 4 is an enlarged schematic view of a switching control unit according to an embodiment of the present application;
FIG. 5 is an enlarged schematic diagram of a voltage stabilizing unit according to an embodiment of the present application;
fig. 6 is an enlarged schematic diagram of a charging output unit according to an embodiment of the present application.
Detailed Description
The application will be described in further detail with reference to the following detailed description and with reference to the accompanying drawings. It should be emphasized that the following description is merely exemplary in nature and is in no way intended to limit the scope of the application or its applications.
Non-limiting and non-exclusive embodiments will be described with reference to the following drawings, in which like reference numerals refer to like elements unless otherwise specified.
As shown in fig. 1, the present embodiment provides a small battery charging device, which includes a power input unit 1 and a charging output unit 5, and a charging management unit 2 and a voltage stabilizing unit 3 for charging the charging output unit 5, and a conversion control unit 4 for performing conversion control during charging; the power input unit 1 is connected with the charging management unit 2 and the voltage stabilizing unit 3; the charging management unit 2 comprises an input terminal 21, an output terminal 22 and a control terminal; the input end 21 is connected to the power input unit 1, and the output end 22 is connected to the charging output unit 5; the conversion control unit 4 comprises a control signal input end 41, a control output end 43, a power supply control end 42 and a control feedback end 44, wherein the control signal input end 41 is connected with the control end, the control output end 43 is connected with the voltage stabilizing unit 3, the control feedback end 44 is connected with the charging output unit 5, and the power supply control end 42 is connected with the power supply input unit 1.
As shown in fig. 2 and fig. 3, the charging management unit 2 of the present embodiment is a PWM step-down lithium battery charging management chip, and has a constant-current constant-voltage charging mode, and the structure of the charging management chip is the prior art, which is not described in detail herein; accordingly, the charging management unit 2 may also be other charging management chips having a constant current and constant voltage charging mode.
The charge management unit 2 includes a first charging unit for trickle charging, and a second charging unit for constant current charging, and a third charging unit for constant voltage charging.
As shown in fig. 3, the schematic diagram of the charge management unit 2 of the present embodiment is described with reference to the accompanying drawings, wherein it should be understood that the following parameters such as charging voltage, current, etc. are merely schematic and are not related to the parameters of the charge output unit 5 of the present embodiment:
the constant current charging current is set by a current sense resistor RCS connected between the CSP pin and the BAT pin, and in the constant voltage charging mode, the battery voltage is 16.8V with an accuracy of 1%. When the VCC pin voltage is greater than the low voltage latch threshold and greater than the battery voltage, the charger operates normally to charge the battery.
If the battery voltage is below 11.2V, the charger automatically enters a trickle charge mode, where the charging current is 15% of the constant current charging current set. When the battery voltage is greater than 11.2V, the charger enters a constant current charging mode, and the charging current is set by an internal 200mV reference voltage and an external resistor RCS, namely, the charging current is 200mV/RCS. When the battery voltage continues to rise close to the constant voltage charging voltage, the charger enters a constant voltage charging mode, and the charging current gradually decreases. When the charging current decreases to the value set by the EOC pin resistance, the charging ends and the DRV pin outputs a high level. The transistor in the drain open-circuit output pin is turned off, and the output is in a high-resistance state; the transistor inside the other open drain output pin is turned on and outputs a low level to indicate the end of charge state.
In this embodiment, the charging current is set as follows:
wherein, the constant current charging current is determined by the following formula:
wherein:
I CH is a constant current charging current.
R CS Is a charge current sensing resistor connected between the CSP pin and the BAT pin.
Subsequently, the charge end current is set:
in the constant voltage charging mode, the charging current gradually decreases, and charging ends when the charging current decreases to a current set by the resistance of the EOC pin.
The charge end current is determined by the following equation:
wherein:
I EOC and (3) charging end current, wherein the unit is ampere.
Rext is the resistance in ohms from the connection between the EOC pin to ground. The resistance value of Rext cannot be greater than 100kΩ, otherwise the charge will not end normally.
R CS Is a charge current sensing resistor between the CSP pin and the BAT pin in ohms.
The ratio of the charge end current to the constant current charge current can be calculated according to the above formula:
when rext=0, I EOC /I CH =9.17%, i.e. the minimum charge end current that the user can set is 9.17% of the set constant current charging current.
When rext=100 kΩ, I EOC /I CH =73%, i.e. the maximum charge end current that the user can set is 73% of the constant current charge current that is set.
According to the principle, the absolute current of most lithium battery charging chips in the current market is usually more than 20MA, cannot be smaller and is even larger;
that is, for the small battery device, even if it is set to 9.17%, the minimum current value that should be reached at the end of charging at the time of ordinary charging of the small battery cannot be satisfied, so the present embodiment is divided into two charging steps at the time of charging the small battery, specifically, the following method:
the method for charging the small battery by using the charging device provided by the embodiment includes: a first charging step: the power input unit 1 charges the charging output unit 5 through the charging management unit 2; during charging, detecting a charging current output by the charging management unit 2, and when the charging current reaches a preset threshold value, stopping charging by the charging management unit 2 and generating a control signal;
a second charging step: the conversion control unit 4 starts the voltage stabilizing unit 3 according to the control signal, and the power input unit 1 charges the charging output unit 5 through the voltage stabilizing unit 3; at the time of charging, the voltage stabilizing unit 3 is controlled by the switching control unit 4 to stop charging.
The first charging step includes: when the charging voltage of the charging output unit 5 is not greater than the first voltage threshold, the charging management unit 2 is trickle charged; when the charging voltage of the charging output unit 5 is not less than the first voltage threshold, the charging management unit 2 is constant-current charging; when the charging voltage of the charging output unit 5 is close to the constant voltage charging voltage, the charging management unit 2 is constant voltage charging.
When an external power supply is connected, a first charging step is carried out, the charging management unit 2 charges the power supply output unit, at the moment, the control end of the charging management unit 2 is in a high-resistance state, at the moment, the conversion control unit 4 does not work, the voltage stabilizing unit 3 does not work, and the voltage stabilizing unit 3 does not output charging voltage;
when the charging current is close to 9.17% (this value may be set according to the resistance value of the detection resistor, for example, 73%, and is preferably 9.17% for a small battery), the charging management unit 2 does not output the charging voltage, and at this time, the control terminal of the charging management unit 2 is at a low level (control signal).
As shown in fig. 2 and 4, in the present embodiment, the switching control unit 4 includes a voltage stabilization start unit 45, a shut-off control unit 46, and a voltage detection unit 47; the voltage stabilizing starting unit 45 is connected with the control signal input end 41 and the power supply input end and is connected with the turn-off control unit 46; the voltage detection unit 47 is connected with the control feedback end 44 and is connected with the turn-off control unit 46; the off control terminal is connected to the control output terminal 43.
The voltage stabilizing starting unit 45 is turned on under the action of low level, and is input through the power supply control end 42 of the voltage stabilizing starting unit 45 by the power supply input unit 1, and a signal is output through the control output end 43 of the turn-off control unit 46, so that the voltage stabilizing unit 3 obtains a starting signal (high level), and the voltage stabilizing unit 3 starts to work and has charging voltage output.
After the regulated power supply is started, the charging output unit 5 (small battery) can be continuously charged in a regulated manner, as shown in fig. 5, the regulated power supply can be a voltage regulator, such as a DC-DC, an LDO, etc., and the regulated charging can be realized.
The voltage stabilizing unit 3 continues to charge the small battery, in the charging process, the voltage detecting unit 47 arranged at the control feedback end 44 detects the charging voltage of the charging output unit 5 to determine the time point when the charging of the voltage stabilizing unit 3 is finished, when the voltage detecting unit 47 detects that the voltage meets 4.2V after the charging is finished, the voltage detecting unit 47 is conducted to control the connected turn-off control unit 46 to cut off the signal output of the control output end 43, so that the end of the charging of the voltage stabilizing unit 3 is realized.
By the control method, the problem that the existing charging unit is not fully charged can be solved, the problem that the existing charging unit is not fully charged is avoided, charging is ended when the existing charging unit is not fully charged up to 4.2V (usually about 4.0V or 4.1V), and through logic control of the conversion control unit 4 and feedback detection of the conversion control unit 4, conversion of two charging steps can be achieved, and charging can be achieved under the condition of low current.
As shown in fig. 4, in the present embodiment, the small battery charging device further includes an indicating unit 48 for indicating the state of charge, and the indicating unit 48 is controlled by the switching control unit 4 to perform the indicating operation.
In this embodiment, the voltage stabilizing start unit 45 is a triode, which may be an NPN type or a PNP type, the turn-off control unit 46 is a relay, and includes a switch K1, and a control portion controlled by the voltage detection unit 47, where the voltage detection unit 47 includes a triode, which may also be an NPN type or a PNP type, and further includes a voltage stabilizing tube, and the indication unit 48 includes an LED1 and an LED2, where the triode of the voltage stabilizing start unit 45 and the triode of the voltage detection unit 47 are of different types.
When the transistor of the voltage detecting unit 47 is stopped, the power supply voltage is applied to the positive electrode of the LED1 through the K1 coil, and the LED1 emits light to indicate the charging state; according to the principle described above, when the battery is charged to 4.2V, and the voltage detection unit 47 is turned on, then the collector of the transistor of the voltage detection unit 47 is at a low level, and from LED1, LED2 is turned on, indicating that charging is completed; the charge state indication and charge completion indication functions are completed from the LEDs 1 and 2.
As shown in fig. 6, in the present embodiment, the small battery charging device further includes a voltage isolation unit 51 for isolating the charge management unit 2 and the voltage stabilizing unit 3 at the charge output unit 5. The voltage isolation unit 51 includes a diode (A1) disposed on the output terminal 22 of the charge management unit 2 and a diode (A2) disposed on the output terminal (i.e., the control feedback terminal 44) of the voltage stabilizing unit 3, thereby realizing that the output voltage does not interfere with the voltage stabilizing unit 3 or the conversion control unit 4 when the charge management unit 2 charges the charge output unit 5, and similarly, the output voltage of the voltage stabilizing unit 3 does not interfere with the charge management unit 2 and the conversion control unit 4 when the voltage stabilizing unit 3 charges.
In the detection feedback of the charging voltage of the charging output unit 5, in some alternative embodiments of the present embodiment, when the voltage isolation unit 51 is not provided, the voltage detection is Vz1 (voltage regulator voltage) +vce (collector-emitter voltage) =vbat (battery voltage) =4.2V, the output voltage of the voltage regulator unit 3 is 4.2V, when the voltage isolation unit 51 is provided, the voltage detection is Vd5 (voltage isolator voltage) +vz1+vce=vbat (battery voltage) =4.2V, the output voltage of the voltage regulator unit 3 is 4.2V, vz1+vce=vbat (battery voltage) =4.2V, and the output voltage of the voltage regulator unit 3 is 4.9V.
The charging method and the charging device comprise a first charging step and a second charging step, wherein the first charging step is carried out by a charging management unit 2, when the charging current is detected to reach a preset threshold value, the charging management unit 2 stops charging and generates a control signal, then a conversion control unit 4 is switched to enter the second charging step according to the control signal to carry out charging, the conversion control unit 4 starts a voltage stabilizing unit 3 to carry out charging, and the voltage stabilizing unit 3 is controlled to stop charging; compared with the existing charging method, the charging method can basically charge the small battery in the first charging stage, when the charging management unit 2 stops charging due to smaller charging current, the charging management unit 2 continuously generates a control signal which starts the switching control unit 4 to start the voltage stabilizing unit 3 to continuously charge the small battery equipment, and in the charging process, the switching control unit 4 controls the voltage stabilizing unit 3 to stop charging.
Through the charging method and the charging device, for small-current charging equipment, the battery can be fully charged to 4.2V, so that the situation that the conventional charging management chip cannot fully charge the battery to 4.2V is overcome, the low-current charging is realized, the service efficiency of the small battery is improved, and the problem that the small battery equipment is small in capacity and is not fully charged is solved.
Those skilled in the art will recognize that numerous variations to the above description are possible, and that the examples are intended only to be illustrative of one or more particular implementations.
While there have been described and illustrated what are considered to be example embodiments of the present application, it will be understood by those skilled in the art that various changes and substitutions can be made therein without departing from the spirit of the application. In addition, many modifications may be made to adapt a particular situation to the teachings of the application without departing from the central concept thereof as described herein. Therefore, it is intended that the application not be limited to the particular embodiment disclosed, but that the application will include all embodiments falling within the scope of the application and equivalents thereof.
Claims (8)
1. A method of charging a small battery, comprising:
a first charging step: the power input unit charges the charging output unit through the charging management unit; when charging, detecting charging current output by the charging management unit, and when the charging current reaches a preset threshold value, stopping charging by the charging management unit and generating a control signal;
a second charging step: the conversion control unit starts the voltage stabilizing unit according to the control signal, and the power input unit charges the charging output unit through the voltage stabilizing unit; when in charging, the voltage stabilizing unit is controlled by the conversion control unit to stop charging;
the conversion control unit comprises a voltage stabilizing starting unit, a turn-off control unit, a voltage detection unit, a control signal input end, a control output end, a power supply control end and a control feedback end, wherein the control signal input end is connected with the control end of the charging management unit, the control output end is connected with the voltage stabilizing unit, the control feedback end is connected with the charging output unit, and the power supply control end is connected with the power supply input unit; the voltage stabilizing starting unit is connected with the control signal input end and the power supply control end and is connected with the turn-off control unit; the voltage detection unit is connected with the control feedback end and the turn-off control unit; the voltage stabilizing starting unit is connected with the control output end through the turn-off control unit;
the voltage stabilizing starting unit is conducted under the action of low level, the power input unit is input through the power control end, signals are output through the turn-off control unit and the control output end, so that the voltage stabilizing unit obtains a starting signal, the voltage stabilizing unit starts to work, and charging voltage is output;
after the voltage stabilizing unit is started, the voltage stabilizing charging is continuously carried out on the charging output unit, in the charging process, the charging voltage of the charging output unit is detected through the voltage detecting unit arranged at the control feedback end, and when the charging voltage reaches a preset threshold value, the voltage detecting unit is conducted so as to control the connected turn-off control unit to cut off the signal output of the control output end, so that the end of the charging of the voltage stabilizing unit is realized.
2. The small battery charging method as claimed in claim 1, wherein the first charging step includes: when the charging voltage of the charging output unit is not greater than a first voltage threshold value, the charging management unit is trickle charging; when the charging voltage of the charging output unit is not less than a first voltage threshold value, the charging management unit is constant-current charging; when the charging voltage of the charging output unit is close to the constant voltage charging voltage, the charging management unit is constant voltage charging.
3. The small battery charging method as claimed in claim 1, wherein: the method also comprises the step of indicating the working state of the small battery charging method; and controlling the indicating unit to work through the conversion control unit.
4. The small battery charging method as claimed in claim 1, wherein: the first charging step and the second charging step are isolated by a voltage isolation unit to complete logic control of the voltage of the charging output unit.
5. The small battery charging device is characterized by comprising a power input unit, a charging output unit, a charging management unit, a voltage stabilizing unit and a conversion control unit, wherein the charging management unit and the voltage stabilizing unit are used for charging the charging output unit; the power input unit is connected with the charging management unit and the voltage stabilizing unit; the conversion control unit comprises a voltage stabilizing starting unit, a turn-off control unit, a voltage detection unit, a control signal input end, a control output end, a power supply control end and a control feedback end, wherein the control signal input end is connected with the control end of the charging management unit, the control output end is connected with the voltage stabilizing unit, the control feedback end is connected with the charging output unit, and the power supply control end is connected with the power supply input unit; the voltage stabilizing starting unit is connected with the control signal input end and the power supply control end and is connected with the turn-off control unit; the voltage detection unit is connected with the control feedback end and the turn-off control unit; the voltage stabilizing starting unit is connected with the control output end through the turn-off control unit; the voltage stabilizing starting unit is conducted under the action of low level, the power input unit is input through the power control end, signals are output through the turn-off control unit and the control output end, so that the voltage stabilizing unit obtains a starting signal, the voltage stabilizing unit starts to work, and charging voltage is output; after the voltage stabilizing unit is started, the voltage stabilizing charging is continuously carried out on the charging output unit, in the charging process, the charging voltage of the charging output unit is detected through the voltage detecting unit arranged at the control feedback end, and when the charging voltage reaches a preset threshold value, the voltage detecting unit is conducted so as to control the connected turn-off control unit to cut off the signal output of the control output end, so that the end of the charging of the voltage stabilizing unit is realized.
6. The small battery charging apparatus as claimed in claim 5, wherein: the device also comprises an indicating unit for indicating the charging state, and the switching control unit is used for controlling the indicating unit to perform indicating operation.
7. The small battery charging apparatus as claimed in claim 5, wherein: the charging system further comprises a voltage isolation unit for isolating the charging management unit and the voltage stabilizing unit at the charging output unit.
8. The small battery charging apparatus as claimed in claim 5, wherein: the charging management unit includes a first charging unit for trickle charging, a second charging unit for constant current charging, and a third charging unit for constant voltage charging.
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| CN108306350A (en) | 2018-07-20 |
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