CN215580456U - Lithium battery charger with high adaptability - Google Patents
Lithium battery charger with high adaptability Download PDFInfo
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- CN215580456U CN215580456U CN202121826861.7U CN202121826861U CN215580456U CN 215580456 U CN215580456 U CN 215580456U CN 202121826861 U CN202121826861 U CN 202121826861U CN 215580456 U CN215580456 U CN 215580456U
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Abstract
The utility model provides a lithium battery charger with high adaptability, which comprises a power supply input port, a charging output port, a polarity conversion circuit and a charging protection module, wherein the polarity conversion circuit and the charging protection module are connected between the power supply input port and the charging output port; the polarity conversion circuit comprises a first diode, a second diode, a third diode and a fourth diode; the negative electrode of the first diode is connected with the negative electrode of the second diode and is connected to the positive input end of the charging protection module; the anode of the second diode is connected with the cathode of the third diode and is connected to one pole of the power supply input port; the anode of the third diode is connected with the anode of the fourth diode and is connected to the negative input end of the charging protection module; and the cathode of the fourth diode is connected with the anode of the first diode and is connected to the other pole of the power supply input port. The utility model can be flexibly matched with various existing 5V power supplies for use, can be connected with any polarity, and is convenient and quick to use.
Description
Technical Field
The utility model relates to the field of aerators, in particular to a lithium battery charger with high adaptability.
Background
18650 lithium battery is a lithium battery that has found wide application in social production and life. Because the lithium battery is not internally provided with the overcharge-proof and short-circuit-proof protection modules, 4.2V is generally adopted for the charging voltage of the 18650 lithium battery charger in order to avoid overcharge during charging.
However, the output voltage of many current power supply devices in daily life is 5V: the output voltage of the mobile power supply is 5V, the output voltage of the computer USB port is 5V, the output voltage of the vehicle-mounted power supply adapter is also 5V, and the like. If 18650 lithium batteries are charged by these power supplies, the occurrence of overcharge can be avoided only by controlling the charging time. However, it is difficult to completely avoid the occurrence of overcharge because it is difficult to control the time completely accurately.
In addition, when the various power supply devices are used for charging, the positive and negative polarities of the charger must be correctly connected with the lithium battery, and the charger cannot be reversely connected. This requires that the user must first confirm the polarity of the charger and the lithium battery during charging, which is not convenient enough. In addition, the conventional charger does not provide short-circuit protection, and the service life of the lithium battery is seriously influenced.
In summary, the convenience and adaptability of the lithium battery charger in the prior art are to be improved.
SUMMERY OF THE UTILITY MODEL
In view of this, it is necessary to provide a lithium battery charger with high adaptability, which can flexibly match with a 5V power supply, can be connected in any polarity direction, and is convenient and fast to use, in order to solve the problems in the prior art.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a lithium battery charger with high adaptability comprises a power supply input port, a charging output port, a polarity conversion circuit and a charging protection module, wherein the polarity conversion circuit and the charging protection module are connected between the power supply input port and the charging output port;
the charging protection module is provided with a positive input end, a negative input end, a positive output end and a negative output end, the positive input end and the negative input end of the charging protection module are connected with the polarity conversion circuit, the positive output end of the charging protection module is connected with the positive electrode of the charging output port, and the negative output end of the charging protection module is connected with the negative electrode of the charging output port;
the polarity conversion circuit comprises a first diode, a second diode, a third diode and a fourth diode; the negative electrode of the first diode is connected with the negative electrode of the second diode and is connected to the positive input end of the charging protection module; the anode of the second diode is connected with the cathode of the third diode and is connected to one pole of the power supply input port; the anode of the third diode is connected with the anode of the fourth diode and is connected to the negative input end of the charging protection module; and the cathode of the fourth diode is connected with the anode of the first diode and is connected to the other pole of the power supply input port.
Further, the charging protection module comprises a short-circuit protection circuit, an overcharge protection circuit and an undervoltage protection circuit which are connected with each other.
Further, the display device also comprises a power supply polarity display circuit connected to the power supply input port.
Further, the power supply polarity display circuit comprises a first light emitting diode, a second light emitting diode and a voltage reduction resistor;
the anode of the first light emitting diode and the cathode of the second light emitting diode are connected to one pole of the input port, and the cathode of the first light emitting diode and the anode of the second light emitting diode are connected to the other pole of the input port through the voltage reduction resistor.
Further, the first light emitting diode is a green light emitting diode, and the second light emitting diode is a red light emitting diode.
The lithium battery charger with high adaptability provided by the utility model can be flexibly matched with various existing 5V power supplies for use, can be connected in any polarity direction, and is convenient and rapid to use. According to the utility model, through a simple circuit structure, the self-adaptive matching of the input voltage polarity of the lithium battery charger is realized, short circuit, under-voltage and over-charge protection is provided for the lithium battery, the safety of the 18650 lithium battery in the charging process is ensured, the service life of the 18650 lithium battery is prolonged, and the lithium battery charger has higher adaptability and use convenience.
Drawings
Fig. 1 is a functional block diagram of a lithium battery charger with high adaptability according to an embodiment of the present invention.
Fig. 2 is a schematic circuit diagram of a lithium battery charger with high adaptability according to an embodiment of the present invention.
Detailed Description
The technical solution of the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, a lithium battery charger with high adaptability according to an embodiment of the present invention includes a power supply input port and a charging output port, and a power supply polarity display circuit, a polarity conversion circuit, and a charging protection module connected between the power supply input port and the charging output port.
The power supply polarity display circuit is used for judging whether a power supply input port has voltage input or not and judging the polarity direction of input voltage;
the polarity conversion circuit is used for uniformly converting the voltage in any polarity direction input by the power supply input port into a polarity direction capable of being used for charging and simultaneously carrying out input end short-circuit protection;
the charging protection module comprises a short-circuit protection circuit, an overcharge protection circuit and an undervoltage protection circuit which are connected with each other, and the short-circuit protection circuit, the overcharge protection circuit and the undervoltage protection circuit are respectively used for carrying out short-circuit protection, overcharge protection and undervoltage protection on a charged lithium battery.
Specifically, as shown in fig. 2, the charging protection module has a positive input terminal P +, a negative input terminal P-, a positive output terminal B + and a negative output terminal B-, the positive input terminal P + and the negative input terminal P-of the charging protection module are connected to the polarity conversion circuit, the positive output terminal B + of the charging protection module is connected to the positive electrode of the charging output port, and the negative output terminal B-of the charging protection module is connected to the negative electrode of the charging output port.
Further, the polarity conversion circuit includes a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4; the cathode of the first diode D1 is connected with the cathode of the second diode D2 and is connected to the positive input end P + of the charge protection module; the anode of the second diode D2 is connected with the cathode of the third diode D3 and is connected with one pole of the power supply input port; the anode of the third diode D3 is connected with the anode of the fourth diode D4 and is connected to the negative input end P-of the charge protection module; the cathode of the fourth diode D4 is connected to the anode of the first diode D1 and to the other pole of the power input port.
Further, the power supply polarity display circuit is connected to the power supply input port. The power supply polarity display circuit comprises a first light-emitting diode LED1, a second light-emitting diode LED2 and a voltage reduction resistor R1;
the anode of the first light emitting diode LED1 and the cathode of the second light emitting diode LED2 are connected to one pole of the input port, and the cathode of the first light emitting diode LED1 and the anode of the second light emitting diode LED2 are connected to the other pole of the input port via a voltage dropping resistor R.
Wherein the first light emitting diode LED1 is a green light emitting diode and the second light emitting diode LED2 is a red light emitting diode. The two light emitting diodes prompt different polarity directions of input voltage by emitting different lights.
When the lithium battery charger with high adaptability provided by the embodiment of the utility model works, 5V input voltage in any polarity direction can be connected to the power supply input port, namely the input voltage can be +5V or-5V.
In the power supply polarity display circuit, when a power supply is connected to the power supply input port, one of the first light emitting diode LED1 and the second light emitting diode LED2 is lit, indicating that a voltage is input. Specifically, taking the orientation shown in fig. 2 as an example, when the voltage input from the power input port is positive, negative, and positive, the first light emitting diode LED1 emits green light, and the second light emitting diode LED2 does not emit light; when the voltage input from the power input port is positive, negative, and negative, the second LED2 emits red light, and the first LED1 is not illuminated. According to the light emitting conditions of the two light emitting diodes, whether voltage is input or not and the specific polarity direction of the input voltage can be judged.
In the polarity conversion circuit, when the input voltage of the power supply input port is positive, negative, and positive, the first diode D1 and the third diode D3 are turned on, and the second diode D2 and the fourth diode D4 are turned off; and when the input voltage of the power supply input port is positive, negative and negative, the second diode D2 and the fourth diode D4 are turned on, and the first diode D1 and the third diode D3 are turned off. Therefore, no matter what polarity direction the input voltage is, the polarity direction of the voltage output by the polarity conversion circuit is positive up and negative down and is matched with the charging protection module, so that the voltage can be charged to the lithium battery through the charging protection module.
Meanwhile, in the polarity conversion circuit, when the power supply input port is short-circuited, the first diode D1, the second diode D2, the third diode D3 and the fourth diode D4 are all in a reverse cut-off state, and the lithium battery connected to the charging output port is not affected by the short circuit of the power supply input port, so that the function of input end short-circuit protection is realized.
In the charging protection module, voltage is input from a positive input end P + and a negative input end P-and is output from a positive output end B + and a negative output end B-to a lithium battery for charging. When the external circuit is short-circuited, the short-circuit protection circuit can play a role in protecting the battery from the short circuit. When the voltage drops to a certain degree, the undervoltage protection circuit can automatically cut off the output to prevent the lithium battery from being damaged by over-discharge. When the lithium battery is fully charged, the overcharge protection circuit can automatically disconnect the input, so that the lithium battery cannot be overcharged.
The lithium battery charger with high adaptability provided by the utility model can be flexibly matched with various existing 5V power supplies for use, can be connected in any polarity direction, and is convenient and rapid to use. According to the utility model, through a simple circuit structure, the self-adaptive matching of the input voltage polarity of the lithium battery charger is realized, short circuit, under-voltage and over-charge protection is provided for the lithium battery, the safety of the 18650 lithium battery in the charging process is ensured, the service life of the 18650 lithium battery is prolonged, and the lithium battery charger has higher adaptability and use convenience.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (5)
1. A lithium battery charger with high adaptability is characterized by comprising a power supply input port, a charging output port, a polarity conversion circuit and a charging protection module, wherein the polarity conversion circuit and the charging protection module are connected between the power supply input port and the charging output port;
the charging protection module is provided with a positive input end, a negative input end, a positive output end and a negative output end, the positive input end and the negative input end of the charging protection module are connected with the polarity conversion circuit, the positive output end of the charging protection module is connected with the positive electrode of the charging output port, and the negative output end of the charging protection module is connected with the negative electrode of the charging output port;
the polarity conversion circuit comprises a first diode, a second diode, a third diode and a fourth diode; the negative electrode of the first diode is connected with the negative electrode of the second diode and is connected to the positive input end of the charging protection module; the anode of the second diode is connected with the cathode of the third diode and is connected to one pole of the power supply input port; the anode of the third diode is connected with the anode of the fourth diode and is connected to the negative input end of the charging protection module; and the cathode of the fourth diode is connected with the anode of the first diode and is connected to the other pole of the power supply input port.
2. The lithium battery charger with high adaptability according to claim 1, wherein the charging protection module comprises a short-circuit protection circuit, an overcharge protection circuit and an undervoltage protection circuit which are connected with each other.
3. The lithium battery charger with high adaptability of claim 1, further comprising a power supply polarity display circuit connected to the power supply input port.
4. The lithium battery charger with high adaptability according to claim 3, wherein the power supply polarity display circuit comprises a first light emitting diode, a second light emitting diode and a voltage reduction resistor;
the anode of the first light emitting diode and the cathode of the second light emitting diode are connected to one pole of the input port, and the cathode of the first light emitting diode and the anode of the second light emitting diode are connected to the other pole of the input port through the voltage reduction resistor.
5. The lithium battery charger with high adaptability according to claim 4, wherein the first light emitting diode is a green light emitting diode, and the second light emitting diode is a red light emitting diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121826861.7U CN215580456U (en) | 2021-08-05 | 2021-08-05 | Lithium battery charger with high adaptability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121826861.7U CN215580456U (en) | 2021-08-05 | 2021-08-05 | Lithium battery charger with high adaptability |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215580456U true CN215580456U (en) | 2022-01-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121826861.7U Active CN215580456U (en) | 2021-08-05 | 2021-08-05 | Lithium battery charger with high adaptability |
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|---|---|
| CN (1) | CN215580456U (en) |
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2021
- 2021-08-05 CN CN202121826861.7U patent/CN215580456U/en active Active
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