CN107863801A - A kind of charging circuit and its charging device - Google Patents
A kind of charging circuit and its charging device Download PDFInfo
- Publication number
- CN107863801A CN107863801A CN201711132379.1A CN201711132379A CN107863801A CN 107863801 A CN107863801 A CN 107863801A CN 201711132379 A CN201711132379 A CN 201711132379A CN 107863801 A CN107863801 A CN 107863801A
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- CN
- China
- Prior art keywords
- charging circuit
- nmos tube
- resistor
- charging
- input
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
-
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present invention relates to charging technique field, more particularly to a kind of charging circuit and its charging device.In the present invention, by setting the resistance value of suitable first resistor to increase the output current of charging circuit, charge efficiency can be considerably increased under the premise of hardly cost is increased by using above-mentioned technical scheme.
Description
Technical field
The present invention relates to charging technique field, more particularly to a kind of charging circuit and its charging device.
Background technology
Boost booster circuits are a kind of common switch DC booster circuits, and it can make output voltage compare input voltage
It is high.When being charged using boost circuits, existing charging circuit causes using big battery because charging current is too small
Project needs additional charging chip, adds cost, also extends development process.
The content of the invention
The problem of existing for prior art, now provide a kind of charging circuit and its charging device.
Specific technical scheme is as follows：
A kind of charging circuit, applied in boost booster circuits, the charging circuit includes：
First input end, input first voltage signal；
Second input, input second voltage signal；
BJT devices, the emitter stage of the BJT devices are connected with the first input end；
NMOS tube, the drain electrode of the NMOS tube are connected with the base stage of the BJT devices, the grid of the NMOS tube with it is described
First input end is connected, and the source electrode of the NMOS tube is connected with second input；
First resistor, the input of the first resistor are connected with the colelctor electrode of the BJT devices；
Wherein, the resistance value of the first resistor is less than 0.2 ohm, and more than or equal to 0.15 ohm.
Preferably, the resistance value of the first resistor is equal to 0.15 ohm.
Preferably, the grid of the NMOS tube is connected by a second resistance with the first input end.
Preferably, the charging current for flowing through the first resistor is 800 milliamperes~1 peace.
Preferably, the output end of the first resistor is connected with one end of one first electric capacity.
Preferably, the opposite other end ground connection of first electric capacity.
Preferably, the first input end passes through one second capacity earth.
Preferably, the substrate terminal of the NMOS tube is connected with the source electrode of the NMOS tube.
Preferably, the grid of the NMOS tube passes through one the 3rd capacity earth.
A kind of charging device, including above-mentioned charging circuit, in addition to the charging circuit being connected with the charging circuit, institute
State that charging circuit is controllable to be connected with battery to be charged；
Wherein, the width of the charging circuit is more than 1 millimeter.
The beneficial effect of above-mentioned technical proposal is：
In above-mentioned technical proposal, by setting the resistance value of suitable first resistor to increase the output electricity of charging circuit
Stream, charge efficiency can be considerably increased under the premise of hardly cost is increased by using above-mentioned technical scheme.
Brief description of the drawings
Fig. 1 is a kind of circuit connection diagram of the embodiment of charging circuit of the present invention.
Embodiment
It should be noted that in the case where not conflicting, following technical proposals, can be mutually combined between technical characteristic.
The embodiment of the present invention is further described below in conjunction with the accompanying drawings：
A kind of charging circuit is present embodiments provided, applied in boost booster circuits, as shown in figure 1, charging circuit bag
Include：
First input end Vin1, input first voltage signal；
Second input Vin2, input second voltage signal；
BJT devices, the emitter stage of BJT devices are connected with first input end Vin1；
NMOS tube, the drain electrode of NMOS tube are connected with the base stage of BJT devices, and grid and the first input end Vin1 of NMOS tube connect
Connect, the source electrode of NMOS tube is connected with the second input Vin2；
First resistor R1, first resistor R1 input are connected with the colelctor electrode of BJT devices；
Wherein, first resistor R1 resistance value is less than 0.2 ohm, and more than or equal to 0.15 ohm.
One application scenarios of the present embodiment can be illustrated with MTK function machine platforms, such as MT6260, MT6261 fill
Electric current is too small, causes the additional charging chip of project needs using big battery, adds cost and also extend development process；This
The charging circuit of embodiment carries circuit for one kind in MTK, can increase the charging circuit of output current.
MTK platform charging circuit core devices are a NMOS tube and a BJT device, and CJMNT33 here is by two
The function of person integrates, and above-mentioned two triode collaboration software controls whole charging process, and wherein first resistor R1 can
Think a high-power resistance, charging current flows through produces voltage difference herein, and this voltage difference is counted after being read by central processing unit
Calculation draws charging current, and thus central processing unit can be adjusted to charging current in good time.
In a preferred embodiment of the invention, first resistor R1 resistance value is equal to 0.15 ohm.
In a preferred embodiment of the invention, the grid of NMOS tube passes through a second resistance R2 and first input end Vin1
Connection.
In a preferred embodiment of the invention, the charging current for flowing through first resistor R1 is 800 milliamperes~1 peace.
In above-described embodiment, its charging current from original 450mA, can reach the 1A of peak value, hardly be added to
Charge efficiency is considerably increased under the premise of this.
In a preferred embodiment of the invention, first resistor R1 output end is connected with one first electric capacity C1 one end.
In a preferred embodiment of the invention, the first electric capacity C1 opposite other end ground connection.
In a preferred embodiment of the invention, first input end Vin1 is grounded by one second electric capacity C2.
In a preferred embodiment of the invention, the substrate terminal of NMOS tube and the source electrode of NMOS tube connect.
In a preferred embodiment of the invention, the grid of NMOS tube is grounded by one the 3rd electric capacity C3.
In above-described embodiment, MT6260 platforms are limited to maximum 800mA to charging current, but actually using 1A chargings is
Necessary, here, first resistor R1 resistance is revised as into 0.15 ohm by 0.2 ohm before, software code will fill
Electric current settings are 800mA, now because feedback resistance is changed, the charging current that central processing unit detects and actual charging
Electric current will have error, and this error is：(0.2-0.15)/0.2=25%, 800mA*125%=1000mA.
The present embodiment is to reach inexpensive big electricity using this error come the hardware limitation of the above-mentioned platform of appropriate breakthrough
The purpose of current charge.
A kind of charging device, including above-mentioned charging circuit are present embodiments provided, in addition to be connected with charging circuit
Charging circuit, charging circuit is controllable to be connected with battery to be charged；
Wherein, the width of charging circuit is more than 1 millimeter.
In the present embodiment, corresponding charging circuit needs to widen on pcb board after first resistor R1 modifications, original 0.5mm's
Line width at least increases to 1mm line widths, and the floor file (GND) of surrounding is good, and charging circuit fan-out capability can be improved accordingly, no
Then bottleneck occurs in charger (device where charging circuit), and the charger at least exported using 1A, charge USB line in addition
Should appropriate overstriking, to adapt to large current charge.
To sum up, in above-mentioned technical proposal, by setting the resistance value of suitable first resistor to increase charging circuit
Output current, charging effect under the premise of hardly cost is increased, can considerably increased by using above-mentioned technical scheme
Rate.
By explanation and accompanying drawing, the exemplary embodiments of the specific structure of embodiment are given, it is smart based on the present invention
God, it can also make other conversions.Although foregoing invention proposes existing preferred embodiment, however, these contents are not intended as
Limitation.
For a person skilled in the art, after reading described above, various changes and modifications undoubtedly will be evident.
Therefore, appended claims should regard whole variations and modifications of the true intention and scope that cover the present invention as.Weighing
Any and all scope and content of equal value, are all considered as still belonging to the intent and scope of the invention in the range of sharp claim.
Claims (10)
1. a kind of charging circuit, it is characterised in that applied in boost booster circuits, the charging circuit includes：
First input end, inputs first voltage signal, and the first voltage signal is more than or equal to 4V；
Second input, input second voltage signal；
BJT devices, the emitter stage of the BJT devices are connected with the first input end；
NMOS tube, the drain electrode of the NMOS tube are connected with the base stage of the BJT devices, the grid of the NMOS tube and described first
Input is connected, and the source electrode of the NMOS tube is connected with second input；
First resistor, the input of the first resistor are connected with the colelctor electrode of the BJT devices；
Wherein, the resistance value of the first resistor is less than 0.2 ohm, and more than or equal to 0.15 ohm.
2. charging circuit according to claim 1, it is characterised in that the resistance value of the first resistor is equal to 0.15 Europe
Nurse.
3. charging circuit according to claim 1, it is characterised in that the grid of the NMOS tube by a second resistance with
The first input end connection.
4. charging circuit according to claim 1, it is characterised in that the charging current for flowing through the first resistor is 800
Pacify milliampere~1.
5. charging circuit according to claim 1, it is characterised in that the output end of the first resistor and one first electric capacity
One end connection.
6. charging circuit according to claim 5, it is characterised in that the opposite other end ground connection of first electric capacity.
7. charging circuit according to claim 1, it is characterised in that the first input end is connect by one second electric capacity
Ground.
8. charging circuit according to claim 1, it is characterised in that the substrate terminal of the NMOS tube and the NMOS tube
Source electrode connects.
9. charging circuit according to claim 1, it is characterised in that the grid of the NMOS tube is connect by one the 3rd electric capacity
Ground.
A kind of 10. charging device, it is characterised in that including the charging circuit as described in claim 1-9 is any, in addition to institute
The charging circuit of charging circuit connection is stated, the charging circuit is controllable to be connected with battery to be charged；
Wherein, the width of the charging circuit is more than 1 millimeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711132379.1A CN107863801A (en) | 2017-11-15 | 2017-11-15 | A kind of charging circuit and its charging device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711132379.1A CN107863801A (en) | 2017-11-15 | 2017-11-15 | A kind of charging circuit and its charging device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107863801A true CN107863801A (en) | 2018-03-30 |
Family
ID=61703066
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711132379.1A Pending CN107863801A (en) | 2017-11-15 | 2017-11-15 | A kind of charging circuit and its charging device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107863801A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114124557A (en) * | 2021-11-30 | 2022-03-01 | 袁林英 | Information security access control method based on big data |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204992643U (en) * | 2015-07-09 | 2016-01-20 | 孙小明 | USB interface charging device based on switch mode regulator |
| CN205081517U (en) * | 2015-10-30 | 2016-03-09 | 杭州士兰微电子股份有限公司 | Power charging circuit |
| CN106655341A (en) * | 2016-11-15 | 2017-05-10 | 深圳天珑无线科技有限公司 | Charging circuit and charging system |
| CN206517124U (en) * | 2015-12-07 | 2017-09-22 | 苏州宝时得电动工具有限公司 | Charger |
-
2017
- 2017-11-15 CN CN201711132379.1A patent/CN107863801A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204992643U (en) * | 2015-07-09 | 2016-01-20 | 孙小明 | USB interface charging device based on switch mode regulator |
| CN205081517U (en) * | 2015-10-30 | 2016-03-09 | 杭州士兰微电子股份有限公司 | Power charging circuit |
| CN206517124U (en) * | 2015-12-07 | 2017-09-22 | 苏州宝时得电动工具有限公司 | Charger |
| CN106655341A (en) * | 2016-11-15 | 2017-05-10 | 深圳天珑无线科技有限公司 | Charging circuit and charging system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114124557A (en) * | 2021-11-30 | 2022-03-01 | 袁林英 | Information security access control method based on big data |
| CN114124557B (en) * | 2021-11-30 | 2024-05-14 | 袁林英 | Information security access control method based on big data |
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| PB01 | Publication | ||
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Application publication date: 20180330 |