CN212258487U - Charging protection circuit and device - Google Patents
Charging protection circuit and device Download PDFInfo
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- CN212258487U CN212258487U CN202021218522.6U CN202021218522U CN212258487U CN 212258487 U CN212258487 U CN 212258487U CN 202021218522 U CN202021218522 U CN 202021218522U CN 212258487 U CN212258487 U CN 212258487U
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Abstract
The utility model discloses a charging protection circuit and a device, wherein the circuit comprises a power supply adaptation module, an overcurrent protection circuit and a charging module connected with a battery; the input end of the power supply adaptation module is connected with a first power supply, the output end of the power supply adaptation module is connected with the input end of the overcurrent protection circuit, and the output end of the overcurrent protection circuit is connected with the charging module; the power supply adaptation module is used for converting power supply voltage output by the first power supply into charging voltage; the charging module is used for receiving the charging voltage to charge the battery; the overcurrent protection circuit is used for detecting the charging current output by the power supply adaptation module and switching off when the charging current is larger than a preset current threshold value. The utility model discloses can cut off charging circuit when charging current is too big, protect the battery and satisfy the authentication requirement that battery charging current does not exceed the battery specification in the safety certification test.
Description
Technical Field
The utility model relates to a circuit electron field especially relates to charging protection circuit and device.
Background
At present, the mode that intelligent equipment charges for the battery is mainly through power adapter access power and output charging voltage to the chip that charges, and the chip that charges is battery charging through output charging voltage to realize charge control. When a product containing a battery leaves a factory, a battery safety certification test is usually required to be performed, and the input end and the output end of a charging chip are required to be in short circuit in the test process, namely, a power adapter is directly connected with the battery for charging. The charging current on the charging loop will exceed the current specification range supported by the battery, thereby causing damage to the battery.
SUMMERY OF THE UTILITY MODEL
A primary object of the present invention is to provide a charging protection circuit and device, which is aimed at solving the problem of battery damage caused by excessive current during the safety certification test.
In order to achieve the above object, the present invention provides a charging protection circuit, which includes a power adapter module, an overcurrent protection circuit, and a charging module connected to a battery;
the input end of the power supply adaptation module is connected with a first power supply, the output end of the power supply adaptation module is connected with the input end of the overcurrent protection circuit, and the output end of the overcurrent protection circuit is connected with the charging module;
the power supply adaptation module is used for converting power supply voltage output by the first power supply into charging voltage;
the charging module is used for receiving the charging voltage to charge the battery;
the overcurrent protection circuit is used for detecting the charging current output by the power supply adaptation module and switching off when the charging current is larger than a preset current threshold value.
Optionally, the over-current protection circuit includes an over-current detection chip, an input end of the over-current detection chip is connected with an output end of the power adapter module, and an output end of the over-current detection chip is connected with the charging module;
the overcurrent detection chip is used for disconnecting the power supply adaptation module from the charging module when the charging current is larger than a preset current threshold value.
Optionally, the overcurrent protection circuit further includes a first capacitor, a first end of the first capacitor is connected to the input end of the overcurrent detection chip, and a second end of the first capacitor is grounded.
Optionally, the overcurrent protection circuit further includes a second capacitor, a first end of the second capacitor is connected to the output end of the overcurrent detection chip, and a second end of the second capacitor is grounded.
Optionally, the over-current detection chip is an LP5301 chip.
Optionally, the charging module includes a charging chip, an input end of the charging chip is connected to an output end of the overcurrent protection circuit, and an output end of the charging chip is connected to the battery.
Optionally, the charging module further includes a first resistor, a second resistor, and a thermistor, and the thermistor is attached to the battery;
the input end of the charging chip is connected with the first end of the first resistor, the second end of the first resistor is connected with the first end of the second resistor, the second end of the second resistor is grounded, the temperature detection end of the charging chip is connected with the first end of the second resistor, and the temperature detection end of the charging chip is also grounded through the thermistor;
the charging chip is also used for stopping charging the battery when the temperature of the thermistor rises.
Optionally, the charging module further includes a third capacitor, an input end of the third capacitor is connected to the output end of the charging chip, and a second end of the third capacitor is grounded.
Optionally, the charging chip is a DIO5158 type chip.
In addition, in order to achieve the above object, the present invention also provides a charging protection device, which includes a charging protection circuit connected to the first power supply, wherein the charging protection circuit is configured as the charging protection circuit described above.
The utility model discloses a set up overcurrent protection circuit and can export charging voltage when charging for the battery at power adaptation module, the charging current on the real-time supervision charging circuit. When abnormity occurs in the charging process or safety certification test is carried out to increase the charging circuit to exceed a preset current threshold value, the overcurrent protection circuit can cut off a charging loop between the power supply adaptation module and the charging module in time so as to avoid damage of the battery due to overlarge charging current. When the charging circuit is in failure and the charging current exceeds the specification of the battery, the function of protecting the battery can be achieved. And when the safety certification test is carried out on the battery, the certification requirement that the charging current of the battery does not exceed the specification of the battery can be met.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic block diagram of a charge protection circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of the embodiment of fig. 1.
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 10 | Power supply adapting module | R1 | A |
| 20 | Overcurrent protection circuit | R2 | |
| 30 | Charging module | NTC | |
| 40 | Battery with a battery cell | C1 | First capacitor |
| U1 | Overcurrent detection chip | C2 | Second capacitor |
| U2 | Charging chip | C3 | Third capacitor |
| V1 | A first power supply |
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit ly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The utility model provides a protection circuit charges is applied to charging protection device, and this charging protection device can protect the battery when the battery carries out IEC62368 safety certification test.
Referring to fig. 1, in an embodiment, the charging protection circuit includes a power adapter module 10, an overcurrent protection circuit 20, and a charging module 30 connected to a battery 40. The input end of the power supply adaptation module 10 is connected with the first power supply V1, the output end of the power supply adaptation module 10 is connected with the input end of the overcurrent protection circuit 20, and the output end of the overcurrent protection circuit 20 is connected with the charging module 30. The first power supply V1 may be an ac mains supply, and the power adapter module 10 may convert the power voltage output by the first power supply V1, that is, 220VAC, into a 5V charging voltage for output after being connected to the mains supply. The overcurrent protection circuit 20 may transmit the charging voltage to the charging module 30 when receiving the charging voltage, so that the charging module 30 charges the battery 40 with the charging voltage. The overcurrent protection circuit 20 is disposed between the power adapter module 10 and the charging module 30, and is capable of detecting the charging current output by the power adapter module 10, and when the overcurrent protection circuit 20 detects that the current charging current is greater than the preset current threshold, the power adapter module 10 and the charging module 30 can be disconnected, so as to stop charging the battery 40.
In the embodiment, the overcurrent protection circuit 20 is arranged to monitor the charging current in the charging loop in real time when the power adapter module 10 outputs the charging voltage to charge the battery 40. When an abnormality occurs in the charging process or a safety certification test is performed so that the charging circuit increases to exceed a preset current threshold, the overcurrent protection circuit 20 can timely cut off the connection between the power adapter module 10 and the charging module 30, so as to prevent the battery 40 from being damaged due to an excessive charging current. When the charging circuit fails and the charging current exceeds the specification of the battery, the battery 40 can be protected. When the safety certification test is carried out on the battery 40, the certification requirement that the charging current of the battery 40 does not exceed the specification of the battery can be met.
Referring to fig. 1 and 2 together, the over-current protection circuit 20 may include an over-current detection chip U1, a first capacitor C1, and a second capacitor C2. The input end of the over-current detection chip U1 is connected with the output end of the power supply adaptation module 10, and the output end of the over-current detection chip U1 is connected with the charging module 30. The first end of the first capacitor C1 is connected with the input end of the over-current detection chip U1, the second end of the first capacitor C1 is grounded, the first end of the second capacitor C2 is connected with the output end of the over-current detection chip U1, and the second end of the second capacitor C2 is grounded. The MOS tube is arranged between the input end and the output end of the overcurrent detection chip U1, when the power supply adaptation module 10 outputs charging voltage, the MOS tube is in a conducting state, the charging module 30 receives the charging voltage to charge the battery 40, and when the overcurrent detection chip U1 detects that the charging current on the charging loop is larger than a preset current threshold value, the MOS tube can be controlled to be cut off. At this time, the power adapter module 10 is disconnected from the charging module 30, and the battery 40 stops charging. First electric capacity C1 and second electric capacity C2 are filter capacitor, first electric capacity C1 can carry out AC filtering to the charging voltage of power adaptation module 10 output, avoid alternating current signal to produce the interference when overcurrent detection chip U1 carries out current detection, second electric capacity C2 can carry out AC filtering to the charging voltage that overcurrent detection chip U1 output to charging module 30, to filter the alternating current signal in the charging voltage, avoid alternating current signal to influence the charging control of charging module 30.
It should be noted that the over-current detection chip U1 may be an LP5301 chip, which has an ISET pin, and the ISET pin may be set to be grounded through a threshold resistor, and the preset current threshold may be changed by adjusting the resistance value of the threshold resistor, so that the over-current detection chip U1 may disconnect the charging circuit when detecting that the charging current exceeds the current specification range of the battery 40.
Further, the charging module 30 may include a charging chip U2, a first resistor R1, a second resistor R2, and a thermistor NTC attached to the battery 40. The charging chip U2 may be a DIO5158 type chip. The input end of the charging chip U2 is connected with the output end of the overcurrent protection circuit 20, and the output end of the charging chip U2 is connected with the battery 40. The input end of the charging chip U2 is further connected with the first end of a first resistor R1, the second end of the first resistor R1 is connected with the first end of a second resistor R2, the second end of the second resistor R2 is grounded, the temperature detection end of the charging chip U2 is connected with the first end of a second resistor R2, and the temperature detection end of the charging chip U2 is further grounded through a thermistor NTC. The first resistor R1, the second resistor R2 and the thermistor NTC form a voltage division circuit, wherein the first resistor R1 is an upward-biased resistor, and an equivalent resistor formed by connecting the second resistor R2 and the thermistor NTC in parallel is a downward-biased resistor. The temperature detection end of the charging chip U2 can detect the divided power supply voltage. The thermistor NTC may be an NTC resistor having a negative temperature coefficient, and when the temperature of the battery 40 increases, the resistance of the thermistor NTC decreases, and the resistance of the equivalent resistor formed by connecting the second resistor R2 and the thermistor NTC in parallel also decreases. When the upper bias resistance in the voltage dividing circuit is unchanged and the lower bias resistance is reduced, the divided power supply voltage detected by the temperature detection end of the charging chip U2 is reduced. When it is detected that the divided power supply voltage decreases to the preset voltage threshold, which indicates that the temperature of the battery 40 exceeds the normal temperature range, the charging chip U2 may stop charging the battery 40, so as to prevent the battery 40 from being damaged due to an excessive temperature.
Further, the charging module 30 may further include a third capacitor C3, an input terminal of the third capacitor C3 is connected to the output terminal of the charging chip U2, and a second terminal of the third capacitor C3 is grounded. The third capacitor C3 can perform ac filtering on the charging voltage received by the battery 40, so that the battery 40 receives a stable dc charging voltage, the charging efficiency of the battery 40 is improved, and the service life of the battery 40 can be prolonged.
The utility model provides a charging protection device, this charging protection device include the protection circuit that charges who is connected with first power V1, and above-mentioned embodiment can be referred to this protection circuit that charges's structure, no longer gives unnecessary details here. It should be understood that, since the charging protection device of the present embodiment adopts the technical solution of the charging protection circuit, the charging protection device has all the beneficial effects of the charging protection circuit.
The above is only the optional embodiment of the present invention, and not therefore the scope of the present invention is limited, all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings, or directly or indirectly applied to other related technical fields, are included in the same way in the protection scope of the present invention.
Claims (10)
1. A charging protection circuit is characterized by comprising a power supply adaptation module, an overcurrent protection circuit and a charging module connected with a battery;
the input end of the power supply adaptation module is connected with a first power supply, the output end of the power supply adaptation module is connected with the input end of the overcurrent protection circuit, and the output end of the overcurrent protection circuit is connected with the charging module;
the power supply adaptation module is used for converting power supply voltage output by the first power supply into charging voltage;
the charging module is used for receiving the charging voltage to charge the battery;
the overcurrent protection circuit is used for detecting the charging current output by the power supply adaptation module and switching off when the charging current is larger than a preset current threshold value.
2. The charging protection circuit of claim 1, wherein the over-current protection circuit comprises an over-current detection chip, an input end of the over-current detection chip is connected with an output end of the power supply adaptation module, and an output end of the over-current detection chip is connected with the charging module;
the overcurrent detection chip is used for disconnecting the power supply adaptation module from the charging module when the charging current is larger than a preset current threshold value.
3. The charge protection circuit of claim 2, wherein the over-current protection circuit further comprises a first capacitor, a first end of the first capacitor is connected to the input end of the over-current detection chip, and a second end of the first capacitor is grounded.
4. The charge protection circuit according to claim 2, wherein the over-current protection circuit further comprises a second capacitor, a first end of the second capacitor is connected to the output end of the over-current detection chip, and a second end of the second capacitor is grounded.
5. The charge protection circuit of claim 2, wherein the over-current detection chip is a LP5301 chip.
6. The charging protection circuit of claim 1, wherein the charging module comprises a charging chip, an input terminal of the charging chip is connected with an output terminal of the over-current protection circuit, and an output terminal of the charging chip is connected with the battery.
7. The charging protection circuit of claim 6, wherein the charging module further comprises a first resistor, a second resistor, and a thermistor, the thermistor being attached to the battery;
the input end of the charging chip is connected with the first end of the first resistor, the second end of the first resistor is connected with the first end of the second resistor, the second end of the second resistor is grounded, the temperature detection end of the charging chip is connected with the first end of the second resistor, and the temperature detection end of the charging chip is also grounded through the thermistor;
the charging chip is also used for stopping charging the battery when the temperature of the thermistor rises.
8. The charging protection circuit of claim 6, wherein the charging module further comprises a third capacitor, an input terminal of the third capacitor is connected to the output terminal of the charging chip, and a second terminal of the third capacitor is grounded.
9. The charge protection circuit of claim 6, wherein said charge chip is a DIO5158 type chip.
10. A charge protection device, comprising a charge protection circuit connected to a first power supply, the charge protection circuit being configured as a charge protection circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021218522.6U CN212258487U (en) | 2020-06-28 | 2020-06-28 | Charging protection circuit and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021218522.6U CN212258487U (en) | 2020-06-28 | 2020-06-28 | Charging protection circuit and device |
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| Publication Number | Publication Date |
|---|---|
| CN212258487U true CN212258487U (en) | 2020-12-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021218522.6U Active CN212258487U (en) | 2020-06-28 | 2020-06-28 | Charging protection circuit and device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118232480A (en) * | 2024-04-23 | 2024-06-21 | 东莞市百强电源科技有限公司 | Charging protection circuit and lithium battery system |
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- 2020-06-28 CN CN202021218522.6U patent/CN212258487U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118232480A (en) * | 2024-04-23 | 2024-06-21 | 东莞市百强电源科技有限公司 | Charging protection circuit and lithium battery system |
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Address after: 516006 Zhongkai high tech Zone 37, Huizhou, Guangdong Patentee after: Tongli Technology Co.,Ltd. Address before: 516006 Zhongkai high tech Zone 37, Huizhou, Guangdong Patentee before: TONLY ELECTRONICS HOLDINGS Ltd. |