CN201985584U - Charging circuit for lithium iron phosphate charging battery - Google Patents
Charging circuit for lithium iron phosphate charging battery Download PDFInfo
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- CN201985584U CN201985584U CN2011201027253U CN201120102725U CN201985584U CN 201985584 U CN201985584 U CN 201985584U CN 2011201027253 U CN2011201027253 U CN 2011201027253U CN 201120102725 U CN201120102725 U CN 201120102725U CN 201985584 U CN201985584 U CN 201985584U
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- diode
- charging
- usb interface
- circuit
- battery
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Abstract
The utility model discloses a charging circuit for a lithium iron phosphate charging battery, comprising a USB (universal serial bus) interface for introducing an external power supply, a positive terminal and a negative terminal, wherein the ground wire (GND) of the USB interface is connected with the negative terminal; a first diode and a second diode are connected in series between the positive voltage wire (VBUS) of the USB interface and the positive terminal; one of the first and second diodes is a silicon diode, while the other is a germanium diode. In the utility model, by the simple circuit, on one hand, the voltage matching problem between the USB interface and a charging battery is solved; on the other hand, the necessary charging control function is realized; the circuit is simple to manufacture and low in the cost, so that existing various complicated charging circuit structures can be effectively replaced; in addition, a charger for the lithium iron phosphate charging battery manufactured based on the charging circuit is convenient and has a wide application range.
Description
Technical field
The utility model relates to a kind of battery charger, particularly a kind of charging circuit of LiFePO4 rechargeable battery.
Background technology
The LiFePO4 rechargeable battery is compared with traditional lead-acid battery, nickel-cadmium cell, Ni-MH battery etc., have advantages such as safety, stability height, environmental protection, low price, therefore its application will be more and more widely, particularly along with the proposition of various battery operational versions, this output voltage is that to replace traditional output voltage be disposable battery about the 1.5V possibility that also will become to the LiFePO4 rechargeable battery about 3.2V.Along with increasing that ferric phosphate lithium cell uses, how it has been charged to the problem of necessary solution easily.Traditional charging circuit complexity, cost of manufacture height, and be not suitable for promoting the use of.
Summary of the invention
For addressing the above problem, the utility model provides a kind of charging circuit of simple, LiFePO4 rechargeable battery that cost of manufacture is low, based on the advantage that the made ferric phosphate lithium cell charger of this circuit has conveniently, the scope of application is wide.
The utility model is that the technical scheme that its problem of solution is adopted is:
A kind of charging circuit of LiFePO4 rechargeable battery, comprise the USB interface that is used to introduce external power source, the negative terminals that is used for the anodal positive terminal that is connected of LiFePO4 rechargeable battery and is used for being connected with LiFePO4 rechargeable battery negative pole, the ground wiring GND of described USB interface is connected with negative terminals, be serially connected with first diode and second diode between the positive voltage wiring VBUS of USB interface and the positive terminal, the anode of first diode is connected with positive voltage wiring VBUS, the negative electrode of first diode is connected with the anode of second diode, the negative electrode of second diode is connected with positive terminal, one of them of first diode and second diode is silicon diode, and another is a germanium diode.
The direct voltage size that USB interface is introduced is generally between 4.75V ~ 5.25V, and the charging voltage of LiFePO4 rechargeable battery is generally between 3.7V ~ 4.3V, the voltage that USB interface is introduced can not be directly used in the LiFePO4 rechargeable battery is charged, in order to make both voltage matches, the utility model is serial connection silicon diode and germanium diode between the positive voltage wiring VBUS of USB interface and positive terminal, wherein the forward voltage drop of silicon diode is about 0.7V, and the forward voltage drop of germanium diode is about 0.3V, become about 3.75V ~ 4.3V after the step-down of voltage that USB interface is introduced through two diodes, become the charging voltage that the bases fit battery uses, in addition, carried out the charging of a period of time when the LiFePO4 rechargeable battery after, the voltage at its two ends can raise gradually, after being elevated to a certain degree, the voltage magnitude of pressure differential at voltage that USB interface is introduced and battery two ends is not enough to order about two diode current flows, the positive voltage wiring VBUS of USB interface and the path between the positive terminal block automatically at this moment, and battery does not recharge.According to above-mentioned description as can be known, the utility model has solved voltage matches problem between USB interface and the rechargeable battery on the one hand by simple circuit, also realized necessary charging controlled function on the other hand, sort circuit simpler production cost is low, the charging circuit structure that can replace existing various complexity effectively, in addition, because external power source is introduced by USB interface, this USB interface can be plugged on the common USB port very easily, therefore also has conveniently based on the made LiFePO4 rechargeable battery charger of charging circuit of the present utility model, the advantage that the scope of application is wide.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples:
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
With reference to Fig. 1, the charging circuit of a kind of LiFePO4 rechargeable battery of the present utility model, comprise the usb 1 that is used to introduce external power source, the negative terminals 3 that is used for the anodal positive terminal 2 that is connected of LiFePO4 rechargeable battery and is used for being connected with LiFePO4 rechargeable battery negative pole, the ground wiring GND of described usb 1 is connected with negative terminals 3, be serially connected with first diode 4 and second diode 5 between the positive voltage wiring VBUS of usb 1 and the positive terminal 2, the anode of first diode 4 is connected with positive voltage wiring VBUS, the negative electrode of first diode 4 is connected with the anode of second diode 5, the negative electrode of second diode 5 is connected with positive terminal 2, one of them of first diode 4 and second diode 5 is silicon diode, another is a germanium diode, the ordering of silicon diode and germanium diode does not limit, during practical application both can for earlier through behind the silicon diode through the structure of germanium diode, also can adopt earlier through behind the germanium diode through the structure of silicon diode.When needs charge to ferric phosphate lithium cell, the user only needs the two poles of the earth with battery respectively according to correct direction and positive terminal 3 and negative terminals 4 electric connections, then usb 1 is plugged on the positions such as USB feeder ear that computer carries to charge to ferric phosphate lithium cell.
Below the charging principle of this charging circuit is described: the direct voltage size that usb 1 is introduced is generally between 4.75V ~ 5.25V, and the charging voltage of LiFePO4 rechargeable battery is generally between 3.7V ~ 4.3V, the voltage that usb 1 is introduced can not be directly used in the LiFePO4 rechargeable battery is charged, in order to make both voltage matches, the utility model is serial connection silicon diode and germanium diode between the positive voltage wiring VBUS of USB interface and positive terminal 3, wherein the forward voltage drop of silicon diode is about 0.7V, and the forward voltage drop of germanium diode is about 0.3V, become about 3.75V ~ 4.3V after the step-down of voltage that USB interface is introduced through two diodes, become the charging voltage that the bases fit battery uses, in addition, carried out the charging of a period of time when the LiFePO4 rechargeable battery after, the voltage at its two ends can raise gradually, after being elevated to a certain degree, the voltage magnitude of pressure differential at voltage that usb 1 is introduced and battery two ends is not enough to order about two diode current flows, the positive voltage wiring VBUS of usb 1 and the path between the positive terminal 2 block automatically at this moment, and battery does not recharge.Therefore, the utility model has solved voltage matches problem between usb 1 and the rechargeable battery on the one hand by simple circuit, has also realized necessary charging controlled function on the other hand.
Above-mentionedly just preferred embodiments more of the present utility model are illustrated and describe; but execution mode of the present utility model is not restricted to the described embodiments; as long as it reaches technique effect of the present utility model with essentially identical means, all should belong to protection range of the present utility model.
Claims (1)
1. the charging circuit of a LiFePO4 rechargeable battery, it is characterized in that comprising the USB interface (1) that is used to introduce external power source, the negative terminals (3) that is used for the anodal positive terminal (2) that is connected of LiFePO4 rechargeable battery and is used for being connected with LiFePO4 rechargeable battery negative pole, the ground wiring GND of described USB interface (1) is connected with negative terminals (3), be serially connected with first diode (4) and second diode (5) between the positive voltage wiring VBUS of USB interface (1) and the positive terminal (2), the anode of first diode (4) is connected with positive voltage wiring VBUS, the negative electrode of first diode (4) is connected with the anode of second diode (5), the negative electrode of second diode (5) is connected with positive terminal (2), one of them of first diode (4) and second diode (5) is silicon diode, and another is a germanium diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201027253U CN201985584U (en) | 2011-04-11 | 2011-04-11 | Charging circuit for lithium iron phosphate charging battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201027253U CN201985584U (en) | 2011-04-11 | 2011-04-11 | Charging circuit for lithium iron phosphate charging battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201985584U true CN201985584U (en) | 2011-09-21 |
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ID=44613035
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201027253U Expired - Fee Related CN201985584U (en) | 2011-04-11 | 2011-04-11 | Charging circuit for lithium iron phosphate charging battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201985584U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102142705A (en) * | 2011-04-11 | 2011-08-03 | 杨福如 | Charging circuit of lithium iron phosphate charging battery |
-
2011
- 2011-04-11 CN CN2011201027253U patent/CN201985584U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102142705A (en) * | 2011-04-11 | 2011-08-03 | 杨福如 | Charging circuit of lithium iron phosphate charging battery |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: JIANGMEN LANGDA GROUP CO., LTD. Free format text: FORMER NAME: RONDA BATTERY CO., LTD., PENGJIANG DISTRICT, JIANGMEN CITY |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 7, building three, No. 185, 529000, 8, Jiangmen, Guangdong, China Patentee after: JIANGMEN PENGJIANG DISTRICT RONDA BATTERY CO., LTD. Address before: 7, building three, No. 185, 529000, 8, Jiangmen, Guangdong, China Patentee before: Jiangmen Pengjiang District Ronda Battery Co., Ltd. |
|
| CP01 | Change in the name or title of a patent holder | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110921 Termination date: 20140411 |