CN203850893U - Practical lithium battery trickle charging circuit - Google Patents
Practical lithium battery trickle charging circuit Download PDFInfo
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- CN203850893U CN203850893U CN201420275480.8U CN201420275480U CN203850893U CN 203850893 U CN203850893 U CN 203850893U CN 201420275480 U CN201420275480 U CN 201420275480U CN 203850893 U CN203850893 U CN 203850893U
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Abstract
The utility model discloses a practical lithium battery trickle charging circuit in order to solve the problem that constant-current, especially constant-voltage charging can affect the performance of a battery in an over-discharge under-voltage state. The practical lithium battery trickle charging circuit comprises a reference voltage circuit, a voltage detection circuit, an electronic switching circuit, a current detection circuit and a current comparison circuit. The reference voltage circuit is used for providing a reference voltage. The voltage detection circuit is used for detecting the voltage of the battery and comparing the voltage with the voltage provided by the reference voltage circuit to judge whether the battery is under-voltage or not. The electronic switching circuit is used for receiving the voltage signals provided by the voltage detection circuit, and making an original charging means continue if the battery is not under-voltage, or switching into a trickle charging means if the battery is under-voltage. The current detection circuit is used for detecting the magnitude of a charging current. The current comparison circuit converts the current signal acquired from the current detection circuit into an voltage, compares the voltage with the voltage value determined by the electronic switching circuit, and sends the result to an optical coupler. The magnitude of an output current is further controlled.
Description
Technical field
The utility model belongs to charger circuit technical field, particularly a kind of lithium electricity charger trickle charging circuit.
Background technology
The charging modes of lithium battery has a variety of, such as constant current charge, constant voltage charge, first constant current constant voltage charge etc. again.Constant current charge is with a fixed current, battery to be charged, and general electric current can be very not large.Constant voltage charge is with a fixed voltage, battery to be charged, and because charging initial stage lithium battery kinetic potential is lower, charging current is very large, and along with the carrying out of charging, electric current will reduce gradually.Lithium battery for overdischarge in under-voltage condition, no matter which kind of charging modes, certain influence is caused to it in capital, especially constant voltage charging method, charging initial stage electric current is excessive, and battery can charge with high magnification, if things go on like this, battery performance can decline a lot, and greatly reduce useful life, may scrap even in a short time.
Utility model content
The utility model, for the deficiency of above-mentioned lithium cell charging mode, provides a kind of circuit that can not have any impact to battery for under-voltage battery charging.
The utility model is achieved by the following technical programs:
A lithium battery trickle charging circuit for practicality, comprises reference voltage circuit, voltage detecting circuit, electronic switching circuit, current detection circuit and current comparison circuit.Described reference voltage circuit, is used to provide reference voltage; Described voltage detecting circuit, detects cell voltage, and compares with the voltage that reference voltage circuit provides, and judges that whether battery is under-voltage; Described electronic switching circuit, accepts the voltage signal that voltage detecting circuit provides, if battery is not under-voltage, continues original charging modes, if under-voltage, carries out trickle charge; Described current detection circuit, is used for detecting charging current; Described current comparison circuit, is converted to voltage by the current signal obtaining from current detection circuit, and compares with the magnitude of voltage being determined by electronic switching circuit, and result is sent to optocoupler, and then controls output current size.
Described reference voltage circuit comprises resistance R 314 and three terminal regulator U301, and R314 one end connects power supply V12V, and the other end connects the negative electrode of U301, the plus earth PGND of U301, control end and negative electrode short circuit.
Described voltage detecting circuit consists of resistance (R333, R338, R340), comparator U102B.Its connected mode is: power supply VOUT+ connects R333, and the other end of R333 connects the 6th pin of R338 and U102B, the other end ground connection PGND of R338, and the 5th pin of U102B meets R340, another termination reference power supply of R340.
Described electronic switching circuit consists of triode D306, metal-oxide-semiconductor Q2 and resistance R 19.Its connected mode is: the 7th pin of the anodic bonding U102B of D306, and negative electrode connects the grid of Q2, and the drain electrode of Q2 meets R19, source ground GND, another termination R339 and the R316 of R19.
Described current detection circuit consists of thyristor CSR4, resistance (R301, R316, R318, R339), comparator U300A and capacitor C 312.Its connected mode is: PGND meets CSR4, the other end of CSR4 connects ground GND and R301, the 2nd pin of another termination U300A of R301, the 2nd pin of U300A meets R339 and R318, another termination R19, the R316 of R339, another termination a reference source of R316, another termination C312 of R318, the 1st pin of another termination U300A of C312, the 8th pin of U300A meets V12V.
Described current comparison circuit consists of triode D304, resistance (R323, R320), optocoupler U302B.Its connected mode is: the anode of D304 connects the 1st pin of U300A, and negative electrode meets R323, another termination R320 of R323 and the light-emitting diodes tube anode of optocoupler U302B, the negative electrode of another termination U302B of R320, simultaneously ground connection PGND.
The beneficial effects of the utility model are:
The problem that the utility model can damage under-voltage lithium battery for constant current, constant voltage charge, designed a kind of circuit, this circuit is when to under-voltage battery charging, cell voltage can be detected below standard value, and then can first carry out trickle precharge to battery, this method has overcome the injury that direct constant current or constant voltage large current charge cause under-voltage lithium battery, can better extending battery life, also can there is certain repair to the under-voltage lithium battery performance of overdischarge.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present utility model;
Fig. 2 is circuit theory diagrams of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail, to make those skilled in the art can implement according to this with reference to specification word.
As shown in Figure 1, a kind of lithium battery trickle charging circuit of practicality, comprises reference voltage circuit, voltage detecting circuit, electronic switching circuit, current detection circuit and current comparison circuit.Reference voltage circuit, is used to provide reference voltage; Voltage detecting circuit, detects cell voltage, and compares with the voltage that reference voltage circuit provides, and judges that whether battery is under-voltage; Electronic switching circuit, accepts the voltage signal that voltage detecting circuit provides, if battery is not under-voltage, continues original charging modes, if under-voltage, carries out trickle charge; Current detection circuit, is used for detecting charging current; Current comparison circuit, is converted to voltage by the current signal obtaining from current detection circuit, and compares with the magnitude of voltage being determined by electronic switching circuit, and result is sent to optocoupler, and then controls output current size.
As shown in Figure 2, reference voltage circuit comprises resistance R 314 and three terminal regulator U301, and R314 one end connects power supply V12V, and the other end connects the negative electrode of U301, the plus earth PGND of U301, control end and negative electrode short circuit.
Voltage detecting circuit consists of resistance (R333, R338, R340), comparator U102B.Its connected mode is: power supply VOUT+ connects R333, and the other end of R333 connects the 6th pin of R338 and U102B, the other end ground connection PGND of R338, and the 5th pin of U102B meets R340, another termination reference power supply of R340.
Electronic switching circuit consists of triode D306, metal-oxide-semiconductor Q2 and resistance R 19.Its connected mode is: the 7th pin of the anodic bonding U102B of D306, and negative electrode connects the grid of Q2, and the drain electrode of Q2 meets R19, source ground GND, another termination R339 and the R316 of R19.
Current detection circuit consists of thyristor CSR4, resistance (R301, R316, R318, R339), comparator U300A and capacitor C 312.Its connected mode is: PGND meets CSR4, the other end of CSR4 connects ground GND and R301, the 2nd pin of another termination U300A of R301, the 2nd pin of U300A meets R339 and R318, another termination R19, the R316 of R339, another termination a reference source of R316, another termination C312 of R318, the 1st pin of another termination U300A of C312, the 8th pin of U300A meets V12V.
Current comparison circuit consists of triode D304, resistance (R323, R320), optocoupler U302B.Its connected mode is: the anode of D304 connects the 1st pin of U300A, and negative electrode meets R323, another termination R320 of R323 and the light-emitting diodes tube anode of optocoupler U302B, the negative electrode of another termination U302B of R320, simultaneously ground connection PGND.
The operation principle of this circuit is:
By VOUT+, R333, R338, U102B, R340, form cell voltage and control comparison circuit, V12V, R314, U301 form reference voltage circuit, when rechargeable battery is during in under-voltage condition, the voltage signal that U102B end of oppisite phase is obtained is less than its in-phase end, from U102B output high level, by D306, Q2 switching tube is opened, R19 and GND are connected.Because R19 is forced to access, the circuit voltage that R301, R339, R316 and a reference source form is reduced, the voltage of U300A end of oppisite phase 2 pin is lower than its 3 pin current sampling voltage, U300A output 1 pin is high level output, this high level is by optocoupler U302B regulation and control whole system, the system output current of making reduces, and in a period of time, maintains trickle charge.When detecting cell voltage, voltage detecting circuit is elevated to after a certain value, this comparison circuit output low level, and Q2 turn-offs R19, and the circuit that Q2 forms is disconnected, and trickle charge finishes, and circuit enters another kind of charged state.Thus, the utility model has prevented the impact of super-high-current charging on low-voltage battery, also the under-voltage battery performance of overdischarge is had to certain repair.
Above-mentioned the utility model charging circuit has been done to detailed description; but can not therefore be interpreted as the restriction to the utility model scope; it should be noted that; for the person of ordinary skill of the art, not departing under the prerequisite of the design's design, can also make some improvement; within these belong to this case protection interest field; therefore, the protection range of this case should be as the criterion with right, and contains its thing such as legal.
Claims (6)
1. a practical lithium battery trickle charging circuit, is characterized in that, comprises reference voltage circuit, voltage detecting circuit, electronic switching circuit, current detection circuit and current comparison circuit;
Described reference voltage circuit, is used to provide reference voltage;
Described voltage detecting circuit, detects cell voltage, and compares with the voltage that reference voltage circuit provides, and judges that whether battery is under-voltage;
Described electronic switching circuit, accepts the voltage signal that voltage detecting circuit provides, if battery is not under-voltage, continues original charging modes, if under-voltage, carries out trickle charge;
Described current detection circuit, is used for detecting charging current;
Described current comparison circuit, is converted to voltage by the current signal obtaining from current detection circuit, and compares with the magnitude of voltage being determined by electronic switching circuit, and result is sent to optocoupler, and then controls output current size.
2. practical lithium battery trickle charging circuit as claimed in claim 1, is characterized in that, described reference voltage circuit comprises resistance R 314 and three terminal regulator U301, R314 one end connects power supply V12V, the other end connects the negative electrode of U301, the plus earth PGND of U301, control end and negative electrode short circuit.
3. practical lithium battery trickle charging circuit as claimed in claim 1, is characterized in that, described voltage detecting circuit consists of resistance (R333, R338, R340), comparator U102B;
Its connected mode is: power supply VOUT+ connects R333, and the other end of R333 connects the 6th pin of R338 and U102B, the other end ground connection PGND of R338, and the 5th pin of U102B meets R340, another termination reference power supply of R340.
4. practical lithium battery trickle charging circuit as claimed in claim 1, is characterized in that, described electronic switching circuit consists of triode D306, metal-oxide-semiconductor Q2 and resistance R 19;
Its connected mode is: the 7th pin of the anodic bonding U102B of D306, and negative electrode connects the grid of Q2, and the drain electrode of Q2 meets R19, source ground GND, another termination R339 and the R316 of R19.
5. practical lithium battery trickle charging circuit as claimed in claim 1, is characterized in that, described current detection circuit consists of thyristor CSR4, resistance (R301, R316, R318, R339), comparator U300A and capacitor C 312;
Its connected mode is: PGND meets CSR4, the other end of CSR4 connects ground GND and R301, the 2nd pin of another termination U300A of R301, the 2nd pin of U300A meets R339 and R318, another termination R19, the R316 of R339, another termination a reference source of R316, another termination C312 of R318, the 1st pin of another termination U300A of C312, the 8th pin of U300A meets V12V.
6. practical lithium battery trickle charging circuit as claimed in claim 1, is characterized in that, described current comparison circuit consists of triode D304, resistance (R323, R320), optocoupler U302B;
Its connected mode is: the anode of D304 connects the 1st pin of U300A, and negative electrode meets R323, another termination R320 of R323 and the light-emitting diodes tube anode of optocoupler U302B, the negative electrode of another termination U302B of R320, simultaneously ground connection PGND.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420275480.8U CN203850893U (en) | 2014-05-27 | 2014-05-27 | Practical lithium battery trickle charging circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420275480.8U CN203850893U (en) | 2014-05-27 | 2014-05-27 | Practical lithium battery trickle charging circuit |
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| Publication Number | Publication Date |
|---|---|
| CN203850893U true CN203850893U (en) | 2014-09-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420275480.8U Expired - Fee Related CN203850893U (en) | 2014-05-27 | 2014-05-27 | Practical lithium battery trickle charging circuit |
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| Country | Link |
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| CN (1) | CN203850893U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107979123A (en) * | 2017-08-08 | 2018-05-01 | 上海裕芯电子科技有限公司 | A kind of supply self adaptation lithium battery charging management circuit |
| CN110912225A (en) * | 2019-11-22 | 2020-03-24 | 深圳市优必选科技股份有限公司 | Charging protection circuit, charging protection device and robot |
-
2014
- 2014-05-27 CN CN201420275480.8U patent/CN203850893U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107979123A (en) * | 2017-08-08 | 2018-05-01 | 上海裕芯电子科技有限公司 | A kind of supply self adaptation lithium battery charging management circuit |
| CN107979123B (en) * | 2017-08-08 | 2024-03-22 | 上海裕芯电子科技有限公司 | Power supply self-adaptive lithium battery charging management circuit |
| CN110912225A (en) * | 2019-11-22 | 2020-03-24 | 深圳市优必选科技股份有限公司 | Charging protection circuit, charging protection device and robot |
| CN110912225B (en) * | 2019-11-22 | 2021-06-25 | 深圳市优必选科技股份有限公司 | Charging protection circuit, charging protection device and robot |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140924 Termination date: 20150527 |
|
| EXPY | Termination of patent right or utility model |