CN218415838U - Lithium battery charging circuit - Google Patents
Lithium battery charging circuit Download PDFInfo
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- CN218415838U CN218415838U CN202123036200.7U CN202123036200U CN218415838U CN 218415838 U CN218415838 U CN 218415838U CN 202123036200 U CN202123036200 U CN 202123036200U CN 218415838 U CN218415838 U CN 218415838U
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- circuit
- single chip
- chip microcomputer
- lithium battery
- charging
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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
Abstract
The utility model relates to a lithium battery charging technology field especially relates to a lithium battery charging circuit, include: the voltage dividing circuit comprises a voltage dividing circuit, a charging control loop, a single chip microcomputer circuit and a lithium battery, wherein the output end of the voltage dividing circuit is connected with the I/O input ends of the charging control loop and the single chip microcomputer circuit respectively, the I/O output end of the single chip microcomputer circuit is connected with the input end of the charging control loop, the VDD end of the single chip microcomputer circuit is connected with the anode of the lithium battery, and the cathode of the lithium battery is connected with the grounding ends of the voltage dividing circuit and the single chip microcomputer circuit. The utility model discloses when not influencing lithium cell overcharge, overdischarge protect function, realized the lithium cell that is 0V to the electric quantity and filled to and carry out undercurrent charging to the lithium cell to can reactivate the lithium cell under the state of lithium cell electric quantity unloading.
Description
Technical Field
The utility model relates to a lithium battery charging technology field especially relates to a lithium battery charging circuit.
Background
Lithium electricity electric tool in market can have longer interval to user's hand owing to production is accomplished, usually because the user shelves for a long time or customer operation reason such as improper, can cause the unloading of the inside lithium cell electric quantity of lithium electricity electric tool like this. When the lithium battery with the low voltage is charged by large current, the performance of the lithium battery can be greatly damaged, and the lithium battery can be scrapped seriously; even some control circuits can not normally open the control loop due to the fact that the voltage of the lithium battery is too low, so that the lithium battery can not be charged by the charger, and the product can not be used. Aiming at the phenomenon, various intelligent chargers are released in the current market, and the problem that the intelligent chargers can only solve the problem of large-current charging but cannot solve the problem of incapability of charging is solved.
SUMMERY OF THE UTILITY MODEL
To the not enough of prior art, the utility model discloses the technical scheme who adopts is: a lithium battery charging circuit comprises a voltage division circuit, a charging control loop, a single chip microcomputer circuit and a lithium battery, wherein the output end of the voltage division circuit is respectively connected with the I/O input ends of the charging control loop and the single chip microcomputer circuit;
the charge control loop includes, but is not limited to, a MOS or band-enabled charge management circuit.
Further, the voltage division circuit comprises resistors R1 and R2, the resistors R1 and R2 are connected in series, the lower end of the resistor R1 is connected with the I/O input end of the single chip microcomputer, and the upper end of the resistor R1 is connected with the Schottky diode D1 and then is connected with the input end of the charging control loop;
the influence of the low-voltage drop characteristic of the Schottky diode D1 on normal charging of the circuit is small, the correct current flow direction is guaranteed by the aid of the forward conduction characteristic of the diode, and the resistors R1 and R2 form a voltage division circuit and are connected to the input end of the single chip microcomputer I/O to conduct charging detection.
Further, the single chip microcomputer circuit comprises diodes D11, D12, D21, D22 and a single chip microcomputer, a common end of a positive pole of the diode D11 and a negative pole of the diode D12 is connected with an I/O1 port of the single chip microcomputer, a negative pole of the diode D11 is connected with a negative pole of the diode D21, a common end of a positive pole of the diode D21 and a negative pole of the diode D22 is connected with an I/O2 port of the single chip microcomputer, and an I/O2 port of the single chip microcomputer is connected with an input end of the charging control loop;
the I/O2 port of the single chip microcomputer is connected with the charging control loop to control the charging control loop to be opened and closed.
The utility model has the advantages that:
1. when not influencing lithium cell overcharge, overdischarge protect function, realized having filled the lithium cell that the electric quantity is 0V to and carry out undercurrent charging to the lithium cell to can reactivate the lithium cell under the state of lithium cell electric quantity unloading.
Drawings
Fig. 1 is a circuit diagram of a lithium battery charging circuit of the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings and examples, which are simplified schematic drawings and which illustrate, by way of illustration only, the basic structure of the invention, and which therefore show only the elements relevant to the invention.
As shown in fig. 1, a lithium battery charging circuit includes a voltage dividing circuit, a charging control loop, a single chip microcomputer circuit and a lithium battery, wherein an output terminal of the voltage dividing circuit is connected to I/O input terminals of the charging control loop and the single chip microcomputer circuit, respectively, an I/O output terminal of the single chip microcomputer circuit is connected to an input terminal of the charging control loop, a VDD terminal of the single chip microcomputer circuit is connected to a positive electrode of the lithium battery, and a negative electrode of the lithium battery is connected to grounding terminals of the voltage dividing circuit and the single chip microcomputer circuit.
According to the lowest working voltage requirement of the single chip microcomputer circuit, the voltage anode of the single chip microcomputer circuit is connected in the I/O port, the voltage drop of the diode is protected, meanwhile, the bearing capacity of the I/O port injection current is considered, the I/O port injection current does not exceed 20mA usually, and matching is carried out through calculating the resistance values of the resistors R1 and R2.
Example 1: taking the lowest working voltage of a single chip microcomputer circuit as 1.5V,0V charging current as about 5mA as an example, the voltage drop of a diode in an I/O port is 0.7V, the voltage difference between the I/O1 port and a power supply port is more than 2.2V, the current from a diode D11 to the anode of the power supply port can be formed, and R1=560 Ω and R2=470 Ω are obtained by calculating the resistance values of R1 and R2.
Example 2: taking the case that the lowest working voltage of a single chip microcomputer circuit is 1.8V,0V charging current is about 5mA, the voltage drop of a diode in an I/O port of the single chip microcomputer is 0.7V, the voltage difference between the I/O1 port and a power supply port is required to exceed 2.5V, current from a diode D11 to the anode of the power supply port can be formed, and R1= R2=510 omega is obtained by calculating resistance values of R1 and R2.
The single chip microcomputer type adopted in the embodiment is as follows: HC32F003C4PA, the working voltage of the singlechip is 1.8V-5.5V; the charging control IC model is: ME4057DSPG, singlechip HC32F003C4 PA's general I/O port P33 connects the CE enable pin of charging control IC ME4057DSPG and carries out charging control.
The working principle of the circuit is as follows:
when the single chip microcomputer works normally, the current loop is supplied to the anode VDD of the power supply of the single chip microcomputer by a lithium battery and is input to be consumed by an internal circuit of the single chip microcomputer;
when the voltage of the battery is lower than the working voltage of the singlechip, the singlechip can not work normally, proper voltage is provided for the I/O port of the singlechip through the divider resistors R1 and R2, and the battery is charged reversely through the power end of the singlechip by utilizing the unidirectional conductivity of a clamping protection diode in the I/O port of the singlechip;
when the voltage of the battery rises from 0V to the lowest working voltage of the single chip microcomputer circuit, the single chip microcomputer circuit starts to work normally, the I/O2 port controls the starting of the charging control loop, and the charging current flows through the D1 Schottky diode and the charging loop to start to charge the lithium battery normally.
In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (3)
1. A lithium battery charging circuit, comprising: the output end of the voltage dividing circuit is respectively connected with the input end of the charging control circuit and the I/O input end of the single chip circuit, the I/O output end of the single chip circuit is connected with the input end of the charging control circuit, the VDD end of the single chip circuit is connected with the anode of the lithium battery, and the cathode of the lithium battery is connected with the voltage dividing circuit and the grounding end of the single chip circuit.
2. A lithium battery charging circuit as claimed in claim 1, characterized in that: the voltage division circuit comprises resistors R1 and R2, the resistors R1 and R2 are connected in series, the lower end of the resistor R1 is connected with an I/O input end of the single chip microcomputer circuit, and the upper end of the resistor R1 is connected with the input end of the charging control loop after being connected with a diode D1.
3. A lithium battery charging circuit as claimed in claim 2, characterized in that: the single chip microcomputer circuit comprises diodes D11, D12, D21 and D22 and a single chip microcomputer, the common end of the anode of the diode D11 and the cathode of the diode D12 is connected with an I/O1 port of the single chip microcomputer, the cathode of the diode D11 is connected with the cathode of the diode D21, the common end of the anode of the diode D21 and the cathode of the diode D22 is connected with an I/O2 port of the single chip microcomputer, and the I/O2 port of the single chip microcomputer is connected with the input end of the charging control loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123036200.7U CN218415838U (en) | 2021-12-06 | 2021-12-06 | Lithium battery charging circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123036200.7U CN218415838U (en) | 2021-12-06 | 2021-12-06 | Lithium battery charging circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218415838U true CN218415838U (en) | 2023-01-31 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123036200.7U Active CN218415838U (en) | 2021-12-06 | 2021-12-06 | Lithium battery charging circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218415838U (en) |
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2021
- 2021-12-06 CN CN202123036200.7U patent/CN218415838U/en active Active
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