CN207320853U - A kind of current foldback circuits of PPTC in charging and discharging lithium battery circuit - Google Patents
A kind of current foldback circuits of PPTC in charging and discharging lithium battery circuit Download PDFInfo
- Publication number
- CN207320853U CN207320853U CN201720378479.1U CN201720378479U CN207320853U CN 207320853 U CN207320853 U CN 207320853U CN 201720378479 U CN201720378479 U CN 201720378479U CN 207320853 U CN207320853 U CN 207320853U
- Authority
- CN
- China
- Prior art keywords
- pptc
- pin
- lithium battery
- resistor
- diode
- 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.)
- Active
Links
Landscapes
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model discloses a kind of current foldback circuits of PPTC in charging and discharging lithium battery circuit, including voltage input end, the first PPTC, the 2nd PPTC, the first electrolytic capacitor C1, the first diode D1, first resistor R1, the second diode D2, second resistance R2, chip U1, the 2nd PPTC, the second electrolytic capacitor C2 and lithium battery；The chip U1 has multiple pins, including pin VDD, pin Vbat, pin STAT and pin PROG, pin VSS, one end of the first PPTC are connected with voltage input end, and the other end of the first PPTC is connected on the pin VDD of chip U1；The beneficial effects of the utility model are：During battery is in electric discharge; electric current from lithium battery through the 2nd PPTC to load discharge, if USB or other reasons below and short circuit, cause excessive electric current; cause the 2nd quick protection acts of PPTC, so that battery when being effectively protected electric discharge is unaffected.
Description
【Technical field】
Charge-discharge circuit technical field is the utility model is related to, is existed more specifically, the utility model is related to a kind of PPTC
Current foldback circuit in charging and discharging lithium battery circuit.
【Background technology】
Mobile power is a kind of portable charger for integrating power supply and charge function.Mobile power can be hand
The electronic equipments such as machine, digital camera charge.To avoid the battery capacity of electronic equipment insufficient, people's needs when outgoing are taken
Band mobile power.
Mobile power at present, charging and discharging lithium battery circuit rear end exports generally all in the form of USB port, in Reusability mistake
, easily there is short circuit phenomenon in Cheng Zhong, damages battery or damage charging circuit, so needing to be protected by.
【Utility model content】
The purpose of this utility model is that effectively overcome the shortcomings of above-mentioned technology, there is provided a kind of PPTC is in charging and discharging lithium battery
Current foldback circuit in circuit, battery is unaffected when which is effectively protected mobile power electric discharge.
What the technical solution of the utility model was realized in：A kind of overcurrents of PPTC in charging and discharging lithium battery circuit is protected
Protection circuit, it is theed improvement is that：Including voltage input end, the first PPTC, the 2nd PPTC, the first electrolytic capacitor C1, the one or two
Pole pipe D1, first resistor R1, the second diode D2, second resistance R2, chip U1, the 2nd PPTC, the second electrolytic capacitor C2 and
Lithium battery；
The chip U1 has multiple pins, including pin VDD, pin Vbat, pin STAT and pin PROG, draws
Foot VSS, one end of the first PPTC are connected with voltage input end, and the other end of the first PPTC is connected to the pin of chip U1
On VDD；
First diode D1, first resistor R1, the second diode D2 and the second resistance R2 is sequentially connected in series to be formed
Display circuit, the first electrolytic capacitor C1 is in parallel with the display circuit, and forms first end point and the second endpoint, the
End point is connected to pin VDD, the second endpoint ground connection；The connecting line of the first resistor R1 and the second diode D2 are public
Line, the common wire are electrically connected with pin STAT；
Second electrolytic capacitor is in parallel with lithium battery, the 3rd endpoint of formation and the 4th endpoint, and the one of the 2nd PPTC
End is connected with pin Vbat, and pin Vbat is the feeder ear of equipment, and the other end of the 2nd PPTC is connected with the 3rd endpoint, institute
The 4th endpoint and pin the VSS ground connection stated.
In above-mentioned structure, 3rd resistor R3 is further included, one end of 3rd resistor R3 is connected to pin PROG, 3rd resistor
The other end of R3 is connected to pin VSS.
The beneficial effects of the utility model are：First PPTC is installed on power input, and component damage below is drawn
The super-high-current risen, the first PPTC immediately enter high resistant guard mode；2nd PPTC is installed on the output terminal of battery, at battery
During electric discharge, electric current from lithium battery through the 2nd PPTC to load discharge, if USB or other reasons below and it is short
Road, causes excessive electric current, causes the 2nd quick protection acts of PPTC, thus battery when being effectively protected electric discharge from
Influence；
【Brief description of the drawings】
Fig. 1 is a kind of circuit theory of current foldback circuits of the PPTC of the utility model in charging and discharging lithium battery circuit
Figure.
【Embodiment】
The utility model will be further described with reference to the accompanying drawings and examples.
With reference to a kind of overcurrent protection electricity of the PPTC that shown in Fig. 1, the utility model discloses in charging and discharging lithium battery circuit
Road, in the present embodiment, including voltage input end, the first PPTC10, the 2nd PPTC20, the first electrolytic capacitor C1, the one or two pole
Pipe D1, first resistor R1, the second diode D2, second resistance R2, chip U1, the 2nd PPTC20, the second electrolytic capacitor C2 and
Lithium battery 30；In the present embodiment, the model MCP73831 of chip U1, chip U1 have multiple pins, including pin VDD, draw
Foot Vbat, pin STAT and pin PROG, pin VSS, one end of the first PPTC10 are connected with voltage input end, and first
The other end of PPTC10 is connected on the pin VDD of chip U1；The first diode D1, first resistor R1, the two or two pole
Pipe D2 and second resistance R2 are sequentially connected in series to form display circuit, and the first electrolytic capacitor C1 and the display circuit are simultaneously
Connection, and 101 and second endpoint 102 of first end point is formed, first end point 101 is connected to pin VDD, and the second endpoint 102 is grounded；Institute
The connecting line for stating first resistor R1 and the second diode D2 is common wire, and the common wire is electrically connected with pin STAT；Institute
The second electrolytic capacitor C2 and the lithium battery 30 stated are in parallel, and form the 3rd endpoint 103 and the 4th endpoint 104, the 2nd PPTC20's
One end is connected with pin Vbat, and pin Vbat is the feeder ear 40 of equipment, the other end and the 3rd endpoint 103 of the 2nd PPTC20
It is connected, the 4th endpoint 104 and pin VSS ground connection.In the present embodiment, the PPTC is in 30 charge-discharge circuit of lithium battery
In current foldback circuit further include 3rd resistor R3, one end of 3rd resistor R3 is connected to pin PROG, 3rd resistor R3's
The other end is connected to pin VSS.
By above-mentioned circuit structure, the first PPTC10 is installed on power input, caused by component damage below
Super-high-current, the first PPTC10 immediately enter high resistant guard mode；2nd PPTC20 is installed on the output terminal of battery, at battery
During electric discharge, electric current from lithium battery 30 through the 2nd PPTC20 to load discharge, if USB or other reasons below
And it is short-circuit, cause excessive electric current, cause the 2nd quick protection acts of PPTC20, so that electricity when being effectively protected electric discharge
Pond is unaffected；In addition, the first diode D1 is bright, represents circuit and charge normal work, the first diode D1 extinguishes, the two or two pole
Pipe D2 shines, and shows that battery is full of.
Described above is only the preferred embodiment of the utility model, and above-mentioned specific embodiment is not to the utility model
Limitation.In the technological thought category of the utility model, various modifications and modification, the ordinary skill of all this areas can occur
Retouching, modification or the equivalent substitution that personnel are made as described above, belong to the scope that the utility model is protected.
Claims (2)
- A kind of 1. current foldback circuits of PPTC in charging and discharging lithium battery circuit, it is characterised in that：Including voltage input end, One PPTC, the 2nd PPTC, the first electrolytic capacitor C1, the first diode D1, first resistor R1, the second diode D2, second resistance R2, chip U1, the 2nd PPTC, the second electrolytic capacitor C2 and lithium battery；The chip U1 has multiple pins, including pin VDD, pin Vbat, pin STAT and pin PROG, pin VSS, one end of the first PPTC are connected with voltage input end, and the other end of the first PPTC is connected to the pin VDD of chip U1 On；First diode D1, first resistor R1, the second diode D2 and the second resistance R2 is sequentially connected in series to form display Circuit, the first electrolytic capacitor C1 is in parallel with the display circuit, and forms first end point and the second endpoint, first end Point is connected to pin VDD, the second endpoint ground connection；The connecting line of the first resistor R1 and the second diode D2 are common wire, institute The common wire stated is electrically connected with pin STAT；Second electrolytic capacitor is in parallel with lithium battery, forms the 3rd endpoint and the 4th endpoint, one end of the 2nd PPTC with Pin Vbat is connected, and pin Vbat is the feeder ear of equipment, and the other end of the 2nd PPTC is connected with the 3rd endpoint, described 4th endpoint and pin VSS ground connection.
- 2. a kind of current foldback circuits of the PPTC according to claim 1 in charging and discharging lithium battery circuit, its feature exist In：3rd resistor R3 is further included, one end of 3rd resistor R3 is connected to pin PROG, and the other end of 3rd resistor R3, which is connected to, to be drawn Foot VSS.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720378479.1U CN207320853U (en) | 2017-04-12 | 2017-04-12 | A kind of current foldback circuits of PPTC in charging and discharging lithium battery circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720378479.1U CN207320853U (en) | 2017-04-12 | 2017-04-12 | A kind of current foldback circuits of PPTC in charging and discharging lithium battery circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207320853U true CN207320853U (en) | 2018-05-04 |
Family
ID=62435808
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720378479.1U Active CN207320853U (en) | 2017-04-12 | 2017-04-12 | A kind of current foldback circuits of PPTC in charging and discharging lithium battery circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207320853U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109149526A (en) * | 2018-08-22 | 2019-01-04 | 深圳市云鼠科技开发有限公司 | A kind of system current foldback circuit applied to sweeping robot control circuit board |
| CN112636457A (en) * | 2020-12-30 | 2021-04-09 | 南昌云华起智能科技有限公司 | Implementation method of direct-current backup power supply system |
-
2017
- 2017-04-12 CN CN201720378479.1U patent/CN207320853U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109149526A (en) * | 2018-08-22 | 2019-01-04 | 深圳市云鼠科技开发有限公司 | A kind of system current foldback circuit applied to sweeping robot control circuit board |
| CN112636457A (en) * | 2020-12-30 | 2021-04-09 | 南昌云华起智能科技有限公司 | Implementation method of direct-current backup power supply system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104810878B (en) | Overvoltage/overcurrent protection circuit and mobile terminal | |
| CN104600676B (en) | Battery protecting circuit, electric energy provide device and electronic installation | |
| CN105849966B (en) | Lithium ion storage battery and charge-discharge control method thereof | |
| CN203086213U (en) | Rapid charger and mobile power supply with the charger | |
| CN209462021U (en) | A kind of reverse connection preventing over-pressure safety device, earphone and USB charging unit | |
| CN202014087U (en) | Lithium battery charging protection circuit for portable system | |
| CN207320853U (en) | A kind of current foldback circuits of PPTC in charging and discharging lithium battery circuit | |
| CN206452101U (en) | A kind of binodal lithium battery protection circuit | |
| CN204538754U (en) | High integrated multifunction portable power source | |
| CN209169945U (en) | A kind of battery and its protection circuit, mine anti-explosion smart phone | |
| CN207124454U (en) | A kind of surge protection circuit | |
| CN207320823U (en) | A kind of safety protective circuit based on battery | |
| CN203352131U (en) | Port with over-current protection and surge prevention functions | |
| CN205753518U (en) | A kind of Undervoltage protection circuit for battery | |
| CN206099420U (en) | Overcharge and prevent device | |
| CN205724948U (en) | A kind of charging and discharging lithium battery control circuit | |
| CN204633443U (en) | A kind of charging equipment for mobile phone for electrostatic collection | |
| CN106786985A (en) | The battery protecting method and circuit and supporting charger of a kind of electrical equipment | |
| CN208571679U (en) | The electrostatic discharge circuit of mobile terminal | |
| CN208656446U (en) | A kind of anti-impacting with high pressure input circuit of mobile power source | |
| CN207426737U (en) | Lithium battery low-resistance protects circuit | |
| CN207559550U (en) | A kind of lithium ion battery protecting plate circuit | |
| CN207530530U (en) | A kind of battery protecting circuit and electronic equipment | |
| CN207691418U (en) | A kind of surge protection circuit and intelligent mobile terminal | |
| CN109546626A (en) | A kind of battery and its protection circuit, mine anti-explosion smart phone |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |