CN108092339A - Constant-current charging circuit applied to linear charger - Google Patents
Constant-current charging circuit applied to linear charger Download PDFInfo
- Publication number
- CN108092339A CN108092339A CN201611028086.4A CN201611028086A CN108092339A CN 108092339 A CN108092339 A CN 108092339A CN 201611028086 A CN201611028086 A CN 201611028086A CN 108092339 A CN108092339 A CN 108092339A
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- charger
- resistance
- battery
- transistor
- module
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- 238000010277 constant-current charging Methods 0.000 title claims abstract description 7
- 238000007600 charging Methods 0.000 claims description 16
- 230000005611 electricity Effects 0.000 claims description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 14
- 229910052744 lithium Inorganic materials 0.000 abstract description 14
- 102100039435 C-X-C motif chemokine 17 Human genes 0.000 description 2
- 101000889048 Homo sapiens C-X-C motif chemokine 17 Proteins 0.000 description 2
- 101100489713 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) GND1 gene Proteins 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- H02J7/0026—
Landscapes
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
It is fully charged and while not connecing battery automatically shuts down charger output for lithium battery the present invention provides a kind of constant-current charging circuit applied to linear charger；The system judges the charged state of battery, then the break-make by turning off system control charger output by detecting the battery-charge signal of charger；The system automatically shuts down the mode of charger output to realize defencive function, greatly enhances the security of charger and lithium battery Acceptable life by identifying charger charged state.
Description
Technical field
The present invention relates to battery charger field, more particularly to a kind of lithium battery charger protection circuit.
Background technology
Recently as the quick increase of portable electronic production device, the demand to lithium battery is also increasing, while right
The demand of lithium battery charger is also increasing.At present, most lithium battery carried charging protection function in the market, therefore
Most lithium battery charger is all without charging protection function excessively；But it since lithium battery product is various in the market, overcharges protection and overcharges work(
Energy quality differs so that the security and service life of lithium battery can not be guaranteed.The also relatively advanced battery in part fills
Electric appliance can carry charging protection function, but be typically all to be integrated with monolithic processor controlled mode and other defencive functions.
The content of the invention
It is an object of the invention to be carried by providing a kind of charger overcharge protection circuit to solve lithium battery product
The situation that charging protection function quality differs.
The present invention is a kind of constant-current charging circuit applied to linear charger, including power module, charger shut-off mould
Block, battery pack, battery pack charging status feedback module, charger shut-off module include delay circuit module and switch electricity
Road module；The delay circuit module, it is interior for a period of time when being powered on for charger whether to connect battery regardless of charger
Normal output can be held；The on-off circuit module, for receiving battery charger charging signals, do not charge when charger or
When charging signals show that battery is full of, shut-off charger output.
As the preferred embodiment of patent of the present invention, the delay circuit module includes charge-discharge circuit module and benchmark
Circuit module；
The charge-discharge circuit module includes：First capacitance, the second capacitance, first resistor, second resistance, 3rd resistor,
Four resistance, the first triode, the second triode, first comparator；First capacitance is connected with second capacitance, non-
End connect with connecting the first power end and the first power supply respectively, series connection end passes through first described in the first resistor connection
Transistor base and the first comparator end of oppisite phase, described its collector of first triode pass through the second resistance
To the first power end, emitter by the 3rd resistor to the first power supply；The first comparator output terminal leads to
It crosses the 4th resistance and connects second transistor base, described its collector of the second triode and the first comparator
End of oppisite phase is connected, and emitter is with connecing the first power supply.
Reference circuit module includes：First photoelectrical coupler, the first diode, the second diode, third transistor, the 4th
Triode, the 5th resistance, the 8th resistance, the 9th resistance, the first relay；First photoelectrical coupler, light-emitting diodes
Pipe anode connects the first power supply by the 5th resistance to the first comparator output terminal, light emitting diode cathode
Ground, the collector connection battery-charge signal, emitter connect the first diode cathode；First diode is born
Pole passes through the 8th resistance to the third transistor base stage, the third transistor collector and the described the 4th
Transistor base is connected through the 9th resistance to the first relay control terminal anode and second diode
Cathode, then to second source end, the 4th transistor collector and second diode cathode and described first
Relay control terminal cathode is connected, and the third transistor emitter and the 4th transistor emitter connect second source
Ground.
Present invention has the advantages that by detecting battery charger charging signals, do not charge in charger or battery is fully charged
Charger is exported afterwards and is turned off, is overcharged so as on the one hand effectively prevent lithium battery charging, on the other hand so that charger exists
It is not exported during light condition, so that the safer and more energy efficient environmental protection of charger.
Description of the drawings
Attached drawing 1 is the principle of the present invention block diagram；
Attached drawing 2 is circuit diagram of the invention.
Specific embodiment
The present invention is further described with reference to Fig. 1,2；
A kind of constant-current charging circuit applied to linear charger of patent of the present invention, including power module 1, charger shut-off module
2nd, battery pack 3, battery-charge signal feedback module 4, charger shut-off module 2 include delay circuit module 2-1 and pass
Deenergizing module 2-2；The delay circuit module 2-1, when being powered on for charger it is interior for a period of time no matter charger whether
Connection battery can also hold normal output；The breaking circuit module 2-2, for receiving battery charger charging signals, when filling
When electric appliance does not charge or charging signals show that battery is full of, shut-off charger output.The delay circuit module 2-1 includes filling
Discharge circuit module 2-1-2 and reference circuit module 2-1-1.
The reference circuit of delay circuit is made of in Fig. 2 resistance R6, resistance R7, is connected by R6 and R7, then connects the respectively
One power end VCC1 and the first power supply ground GND1, it is same to first comparator U1A to generate a reference voltage at R6 and R7 series connection
Xiang Duan.
By the first capacitance C1, the second capacitance C2, first resistor R1, second resistance R2,3rd resistor R3, the 4th electricity in Fig. 2
R4, the first triode Q1, the second triode Q2, the charge-discharge circuit of first comparator U1A composition delay circuits are hindered, when powering on
VCC1 is charged by C1 to C2, makes to obtain a high level at C1 and C2 series connection, which passes through R1 to Q1 base stages Q1
Conducting, Q1 and R2, R3 of conducting form a partial pressure relationship so that Q1 emitter voltages are slightly below the height electricity at C1 and C2 series connection
It is flat, therefore high level is formed a slow discharge process, while is also made by R1, base stage and emitter, R3 to the GND1 of Q1
The voltage for obtaining Q1 base stages obtains a process slowly declined, and when Q1 base voltages are decreased below U1A in-phase ends, U1A is defeated
Outlet exports high level by R4 to Q2 base stages, turns on Q2, the voltage of Q1 base stages is then pulled to rapidly 0V, which prevent
Q1 base stages are discharged to reference voltage（That is U1A in-phase ends voltage）U1A output terminals are anti-between high level and low level during critical point
Complex wave moves；Terminate to this delay circuit.
During delay circuit is delayed, the light emitting diode of the first photoelectrical coupler PC1 is constantly in off state, therefore
The collector of PC1 is also constantly in off state with emitter so that battery-charge signal can not be by causing relay always
It is in the conduction state；
At the end of delay, PC1 LEDs ONs, PC1 collectors are turned on emitter, battery-charge signal（Battery fills
Electric signal can use power supply and refer to modulating signal, and when charger is in non-charged state, non-charging indicator light is lighted, and therefrom obtain one
High level is as the non-charging status signal of battery）8th resistance R8 is reached by PC1；When battery-charge signal is high level（I.e.
For non-charged state）When, high level causes Q3 to turn on by R8, and the 4th triode Q4 base voltages is then made to be pulled to low level
Q4 is turned off, therefore the first relay K1 is turned off, charger output voltage can not reach relay at relay IN by K1
OUT, therefore charger Non voltage output；Conversely, when battery-charge signal is low level（I.e. charger is charged state）When, K1
Conducting, charger normally export.
It is special suitable for various lithium battery chargers the present invention provides a kind of turning off system for lithium battery charger
It is not that stringenter occasion is required to protection service life of lithium battery and needs to automatically shut down charger output in non-charged state
Occasion.
The embodiments of the present invention described above are not intended to limit the scope of the present invention.It is any in the present invention
Spirit and principle within the modifications, equivalent substitutions and improvements made etc., should be included in the claim protection model of the present invention
Within enclosing.
Claims (2)
1. a kind of constant-current charging circuit applied to linear charger, it is characterised in that：Including power module, charger shut-off mould
Block, battery pack, battery pack charging status feedback module, charger shut-off module include delay circuit module and switch electricity
Road module；The delay circuit, it is interior for a period of time when being powered on for charger no matter whether charger connects battery and can also hold
Normal output；The breaking circuit, for receiving battery charger charging signals, when charger does not charge or charging signals
When display battery is full of, shut-off charger output.
2. it is applied to the constant-current charging circuit of linear charger as described in claim 1, it is characterised in that：The delay electricity
Road module includes charge-discharge circuit module and reference circuit module；
The charge-discharge circuit module includes：First capacitance, the second capacitance, first resistor, second resistance, 3rd resistor,
Four resistance, the first triode, the second triode, first comparator；First capacitance is connected with second capacitance, non-
End connect with connecting the first power end and the first power supply respectively, series connection end passes through first described in the first resistor connection
Transistor base and the first comparator end of oppisite phase, described its collector of first triode pass through the second resistance
To the first power end, emitter by the 3rd resistor to the first power supply；The first comparator output terminal leads to
It crosses the 4th resistance and connects second transistor base, described its collector of the second triode and the first comparator
End of oppisite phase is connected, and emitter is with connecing the first power supply；
The reference circuit module includes：First photoelectrical coupler, the first diode, the second diode, third transistor,
Four triodes, the 5th resistance, the 8th resistance, the 9th resistance, the first relay；First photoelectrical coupler, luminous two
Pole pipe anode connects the first power supply by the 5th resistance to the first comparator output terminal, light emitting diode cathode
Ground, the collector connection battery-charge signal, emitter connect the first diode cathode；First diode is born
Pole passes through the 8th resistance to the third transistor base stage, the third transistor collector and the described the 4th
Transistor base is connected through the 9th resistance to the first relay control terminal anode and second diode
Cathode, then to second source end, the 4th transistor collector and second diode cathode and described first
Relay control terminal cathode is connected, and the third transistor emitter and the 4th transistor emitter connect second source
Ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611028086.4A CN108092339A (en) | 2016-11-21 | 2016-11-21 | Constant-current charging circuit applied to linear charger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611028086.4A CN108092339A (en) | 2016-11-21 | 2016-11-21 | Constant-current charging circuit applied to linear charger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108092339A true CN108092339A (en) | 2018-05-29 |
Family
ID=62168402
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611028086.4A Pending CN108092339A (en) | 2016-11-21 | 2016-11-21 | Constant-current charging circuit applied to linear charger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108092339A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113949040A (en) * | 2021-10-19 | 2022-01-18 | 浙江法然特浙科科技有限公司 | Automatic power-off charger system |
-
2016
- 2016-11-21 CN CN201611028086.4A patent/CN108092339A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113949040A (en) * | 2021-10-19 | 2022-01-18 | 浙江法然特浙科科技有限公司 | Automatic power-off charger system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180529 |
|
| WD01 | Invention patent application deemed withdrawn after publication |