CN219611403U - Improved constant-current and constant-voltage battery charging circuit - Google Patents
Improved constant-current and constant-voltage battery charging circuit Download PDFInfo
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- CN219611403U CN219611403U CN202320199122.2U CN202320199122U CN219611403U CN 219611403 U CN219611403 U CN 219611403U CN 202320199122 U CN202320199122 U CN 202320199122U CN 219611403 U CN219611403 U CN 219611403U
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Abstract
The utility model discloses an improved constant-current and constant-voltage battery charging circuit, which comprises: the charging circuit is connected to the output end of the AC-DC buck conversion circuit, the charging circuit is connected to the output end of the absorbing circuit, a controllable precise voltage stabilizing source in the charging circuit is connected with a current compensation circuit, the current compensation circuit comprises a first compensation resistor and a second compensation resistor, the reference voltage of the controllable precise voltage stabilizing source is compensated through current signals of the first compensation resistor and the second compensation resistor, the reference voltage is raised, the charging isolation diode and the loss voltage of the constant current detection resistor are compensated, the purpose of constant current is achieved for the battery, high voltage is not continuously compensated for the battery, and VS+ is reduced to restore an initial value after charging is completed; and the later charging time is shortened, and the manufacturing cost is low.
Description
Technical Field
The utility model relates to the technical field of charging circuits, in particular to an improved constant-current constant-voltage battery charging circuit.
Background
The existing ternary lithium constant-current constant-voltage charging circuit is generally provided with an isolation diode inside, but the isolation diode has different voltage drops under different currents due to the characteristics of the isolation diode, so that a relatively large error is caused in the voltage output to a battery terminal, and the error can cause the situation that the ternary lithium battery is overcharged or not fully charged during charging. Similarly, the current detection resistor has different voltage drops under different currents, and voltage errors output to the battery terminal can be caused. Under the influence of the two, a larger error is caused in the voltage of the battery terminal of the conventional charging circuit. Furthermore, under the influence of the two voltage drops, the charging current of the battery is obviously reduced in the later stage of charging, and the charging time is prolonged.
Accordingly, there is a need for an improved constant current constant voltage battery charging circuit that solves one or more of the above problems.
Disclosure of Invention
The utility model provides an improved constant-current and constant-voltage battery charging circuit for solving one or more problems in the prior art. The utility model adopts the technical proposal for solving the problems that: an improved constant current constant voltage battery charging circuit, comprising: the AC-DC buck conversion circuit is provided with a rectifier bridge, a charging management chip and a transformer, wherein the charging management chip is electrically connected with a first optocoupler, and two ends of an output winding of the transformer are electrically connected with an absorption circuit;
the absorption circuit comprises a first diode and a first capacitor, a first end of the absorption circuit is electrically connected with a first end of the output winding, and a second end of the absorption circuit is commonly connected with a second end of the output winding;
the both ends electricity of absorption circuit is connected with charging circuit, charging circuit includes: the controllable accurate steady voltage source, the isolation diode that charges, constant current detection resistance, current compensation circuit, second opto-coupler and triode, the input of isolation diode that charges with absorption circuit's first end electricity is connected, the output of isolation diode that charges is connected with the first end electricity of battery charging end, the second end at battery charging end is connected to constant current detection resistance electricity, current compensation circuit includes: the first compensation resistor and the second compensation resistor;
the input end of the first compensation resistor is electrically connected with the second end of the battery charging end and the input end of the constant current detection resistor, the output end of the first compensation resistor is electrically connected with the anode of the controllable precise voltage stabilizing source and the input end of the second compensation resistor, and the output end of the second compensation resistor is commonly connected with the output end of the constant current detection resistor and the second end of the absorption circuit;
the first optical coupler is used in pair with the second optical coupler, the output end of the second optical coupler is electrically connected with the cathode of the controllable precise voltage stabilizing source, and the input end of the second optical coupler is electrically connected with the first end of the absorption circuit through a first resistor;
the reference electrode of the controllable precise voltage stabilizing source is electrically connected with the first end of the absorption circuit through a second resistor, and the reference electrode of the controllable precise voltage stabilizing source is electrically connected with the output end of the constant current detection resistor through a third resistor;
the grid electrode of the triode is electrically connected with the input end of the constant current detection resistor through a fourth resistor, the collector electrode of the triode is electrically connected with the cathode of the controllable precise voltage stabilizing source, and the emitter electrode of the triode is electrically connected with the output end of the constant current detection resistor.
Further, the input end of the first diode is electrically connected with the first end of the output winding, the output end of the first diode is electrically connected with the first end of the first capacitor, the second end of the first capacitor is electrically connected with the second end of the output winding, the second end of the first capacitor is commonly connected with the second end of the output winding, the first end of the first capacitor is the first end of the absorption circuit, and the second end of the first capacitor is the second end of the absorption circuit.
The beneficial value obtained by the utility model is as follows: by combining the scheme, the utility model realizes that the reference voltage of the controllable precise voltage stabilizing source is compensated by using the current signals of the first compensation resistor and the second compensation resistor, so that the reference voltage is raised, the set voltage of VS+ (at the input end of the second resistor) is also raised, and the raised voltage is used for compensating the loss voltage of the charging isolation diode and the constant current detection resistor, so that the battery realizes the purpose of constant current. When the voltage of the battery reaches the original VS+, the current is quickly reduced, compensation is weakened after the current is reduced, so that when the charging current is reduced to 0 after the charging is completed, the compensation is 0, the voltage of the VS+ returns to the original set value, the high voltage is not continuously compensated for the battery, namely, the maximum VS+ in the charging process (which is equal to the voltage drop of the VS+ plus the charging isolation diode and the voltage drop of the constant current detection resistor) is equal to the maximum VS+ before the charging process, the current is reduced to 0 after the charging process is fully charged, the voltage drop of the charging isolation diode and the voltage drop of the constant current detection resistor are not influenced in the subsequent charging process, the charging voltage is reduced to the original position after the charging process, and the later charging time is shortened. The implementation cost of the utility model is very low. The practical value of the utility model is greatly improved.
Drawings
Fig. 1 is a schematic diagram of the present utility model.
Detailed Description
In order that the above-recited objects, features and advantages of the present utility model will become more readily apparent, a more particular description of the utility model briefly described above will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The utility model may be embodied in many other forms than described herein without departing from the spirit or scope of the utility model as defined in the following claims.
As shown in fig. 1, the present utility model discloses an improved constant-current constant-voltage battery charging circuit, which comprises: the AC-DC buck conversion circuit is provided with a rectifier bridge DB1, a charging management chip UA1 and a transformer T1, wherein the charging management chip UA1 is electrically connected with a first optocoupler U2-A, two ends of an output winding T1-B of the transformer T1 are electrically connected with an absorption circuit, and the rectifier bridge DB1 is connected with an alternating-current end;
the absorption circuit comprises a first diode D7 and a first capacitor C5, a first end of the absorption circuit is electrically connected with a first end of the output winding T1-B, and a second end of the absorption circuit is commonly connected with a second end of the output winding T1-B;
the both ends electricity of absorption circuit is connected with charging circuit, charging circuit includes: the controllable accurate steady voltage source U3, charging isolation diode D01, constant current detection resistance RS1, current compensation circuit, second opto-coupler U2-B and triode Q3, charging isolation diode D01's input with absorption circuit's first end electricity is connected, charging isolation diode D01's output and battery charge end B01's first end (positive electrode) electricity is connected, constant current detection resistance RS1 electricity is connected at battery charge end's second end (negative electrode), current compensation circuit includes: a first compensation resistor RS3 and a second compensation resistor RS2;
the input end of the first compensation resistor RS3 is electrically connected with the second end of the battery charging end and the input end of the constant current detection resistor RS1, the output end of the first compensation resistor RS3 is electrically connected with the anode of the controllable precise voltage stabilizing source U3 and the input end of the second compensation resistor RS2, and the output end of the second compensation resistor RS2 is commonly connected with the output end of the constant current detection resistor RS1 and the second end of the absorption circuit;
the first optical coupler U2-A is matched with the second optical coupler U2-B for use, the output end of the second optical coupler U2-B is electrically connected with the cathode of the controllable precise voltage stabilizing source U3, and the input end of the second optical coupler U2-B is electrically connected with the first end of the absorption circuit through a first resistor R8;
the reference electrode of the controllable precise voltage stabilizing source U3 is electrically connected with the first end of the absorption circuit through a second resistor R11, and the reference electrode of the controllable precise voltage stabilizing source U3 is electrically connected with the output end of the constant current detection resistor RS1 through a third resistor R10;
the grid electrode of the triode Q3 is electrically connected with the input end of the constant current detection resistor RS1 through a fourth resistor R16, the collector electrode of the triode Q3 is electrically connected with the cathode of the controllable precise voltage stabilizing source U3, and the emitter electrode of the triode Q3 is electrically connected with the output end of the constant current detection resistor RS 1.
It should be noted that, referring to fig. 1, the AC-DC buck conversion circuit is a conventional buck conversion circuit, and the AC-DC buck converter, that is, PART a in fig. 1, may be formed by the AC-DC buck conversion circuit and the absorption circuit, so as to convert the AC voltage into the low-voltage DC required for charging. The AC-DC buck conversion circuit is conventional in the art and has many conventional implementations, and schematic diagrams and conventional variations corresponding to these implementations are well known to those skilled in the art. The charging circuit is PART B in fig. 1.
Specifically, as shown in fig. 1, the input end of the first diode D7 is electrically connected to the first end of the output winding T1-B, the output end of the first diode D7 is electrically connected to the first end of the first capacitor C5, the second end of the first capacitor C5 is electrically connected to the second end of the output winding T1-B, the second end of the first capacitor C5 is commonly connected to the second end of the output winding T1-B, the first end of the first capacitor C5 is the first end of the absorption circuit, and the second end of the first capacitor C5 is the second end of the absorption circuit. The absorption circuit forms a capacitor charging loop and is used for absorbing the electric energy released by the winding and releasing the electric energy into a subsequent loop to charge the battery.
By combining the scheme, the utility model realizes that the reference voltage of the controllable precise voltage stabilizing source is compensated by using the current signals of the first compensation resistor and the second compensation resistor, so that the reference voltage is raised, the set voltage of VS+ (at the input end of the second resistor) is also raised, and the raised voltage is used for compensating the loss voltage of the charging isolation diode and the constant current detection resistor, so that the battery realizes the purpose of constant current. When the voltage of the battery reaches the original VS+, the current is quickly reduced, compensation is weakened after the current is reduced, so that when the charging current is reduced to 0 after the charging is completed, the compensation is 0, the voltage of the VS+ returns to the original set value, the high voltage is not continuously compensated for the battery, namely, the maximum VS+ in the charging process (which is equal to the voltage drop of the VS+ plus the charging isolation diode and the voltage drop of the constant current detection resistor) is equal to the maximum VS+ before the charging process, the current is reduced to 0 after the charging process is fully charged, the voltage drop of the charging isolation diode and the voltage drop of the constant current detection resistor are not influenced in the subsequent charging process, the charging voltage is reduced to the original position after the charging process, and the later charging time is shortened.
The foregoing examples are merely representative of one or more embodiments of the present utility model and are described in more detail and are not to be construed as limiting the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of the utility model should be assessed as that of the appended claims.
Claims (2)
1. An improved constant current and constant voltage battery charging circuit, comprising: the AC-DC buck conversion circuit is provided with a rectifier bridge, a charging management chip and a transformer, wherein the charging management chip is electrically connected with a first optocoupler, and two ends of an output winding of the transformer are electrically connected with an absorption circuit;
the absorption circuit comprises a first diode and a first capacitor, a first end of the absorption circuit is electrically connected with a first end of the output winding, and a second end of the absorption circuit is commonly connected with a second end of the output winding;
the both ends electricity of absorption circuit is connected with charging circuit, charging circuit includes: the controllable accurate steady voltage source, the isolation diode that charges, constant current detection resistance, current compensation circuit, second opto-coupler and triode, the input of isolation diode that charges with absorption circuit's first end electricity is connected, the output of isolation diode that charges is connected with the first end electricity of battery charging end, the second end at battery charging end is connected to constant current detection resistance electricity, current compensation circuit includes: the first compensation resistor and the second compensation resistor;
the input end of the first compensation resistor is electrically connected with the second end of the battery charging end and the input end of the constant current detection resistor, the output end of the first compensation resistor is electrically connected with the anode of the controllable precise voltage stabilizing source and the input end of the second compensation resistor, and the output end of the second compensation resistor is commonly connected with the output end of the constant current detection resistor and the second end of the absorption circuit;
the first optical coupler is used in pair with the second optical coupler, the output end of the second optical coupler is electrically connected with the cathode of the controllable precise voltage stabilizing source, and the input end of the second optical coupler is electrically connected with the first end of the absorption circuit through a first resistor;
the reference electrode of the controllable precise voltage stabilizing source is electrically connected with the first end of the absorption circuit through a second resistor, and the reference electrode of the controllable precise voltage stabilizing source is electrically connected with the output end of the constant current detection resistor through a third resistor;
the grid electrode of the triode is electrically connected with the input end of the constant current detection resistor through a fourth resistor, the collector electrode of the triode is electrically connected with the cathode of the controllable precise voltage stabilizing source, and the emitter electrode of the triode is electrically connected with the output end of the constant current detection resistor.
2. The improved constant current and constant voltage battery charging circuit according to claim 1, wherein the input terminal of the first diode is electrically connected to the first terminal of the output winding, the output terminal of the first diode is electrically connected to the first terminal of the first capacitor, the second terminal of the first capacitor is electrically connected to the second terminal of the output winding, the second terminal of the first capacitor is commonly connected to the second terminal of the output winding, the first terminal of the first capacitor is the first terminal of the absorption circuit, and the second terminal of the first capacitor is the second terminal of the absorption circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320199122.2U CN219611403U (en) | 2023-02-13 | 2023-02-13 | Improved constant-current and constant-voltage battery charging circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320199122.2U CN219611403U (en) | 2023-02-13 | 2023-02-13 | Improved constant-current and constant-voltage battery charging circuit |
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| Publication Number | Publication Date |
|---|---|
| CN219611403U true CN219611403U (en) | 2023-08-29 |
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| CN202320199122.2U Active CN219611403U (en) | 2023-02-13 | 2023-02-13 | Improved constant-current and constant-voltage battery charging circuit |
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| Country | Link |
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| CN (1) | CN219611403U (en) |
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2023
- 2023-02-13 CN CN202320199122.2U patent/CN219611403U/en active Active
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