CN212085868U - Charging terminal over-temperature and over-voltage protection circuit and rechargeable equipment - Google Patents
Charging terminal over-temperature and over-voltage protection circuit and rechargeable equipment Download PDFInfo
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- CN212085868U CN212085868U CN202021190366.7U CN202021190366U CN212085868U CN 212085868 U CN212085868 U CN 212085868U CN 202021190366 U CN202021190366 U CN 202021190366U CN 212085868 U CN212085868 U CN 212085868U
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Abstract
The embodiment of the utility model discloses charge end excess temperature overvoltage crowbar, this charge end excess temperature overvoltage crowbar includes: the overvoltage protection device comprises an anti-surge module, an over-temperature protection module and an overvoltage protection module; the first end of the anti-surge module is connected with the power input end, and the second end of the anti-surge module is grounded; the input end of the overvoltage protection module is connected with the input end of the power supply, and the output end of the overvoltage protection module is connected with the rechargeable equipment; the first end of the over-temperature protection module is connected with the power input end, the second end of the over-temperature protection module is grounded, the third end of the over-temperature protection module is connected with the enabling end of the overvoltage protection module, and the over-temperature protection module is used for driving the overvoltage protection module to start. The embodiment of the utility model avoids the occurrence of instantaneous overvoltage by adding the surge prevention module; still through increasing excess temperature protection module and overvoltage protection module, prevent that unusual short circuit or circuit abnormal temperature are too high to burn out the charging wire, improve the security of charging.
Description
Technical Field
The utility model belongs to the technical field of the equipment charging technique and specifically relates to charge end excess temperature overvoltage crowbar and chargeable equipment.
Background
With the rapid development of the intelligent rechargeable device, the user uses the intelligent rechargeable device more frequently, which also puts higher requirements on the charging technology of the intelligent rechargeable device. The direct charging scheme has the advantages of fast charging and high charging efficiency, and more intelligent rechargeable devices are charged through direct charging. The charging speed of the mobile phone can be greatly improved by adopting direct charging, but certain potential safety hazards also exist, for example, abnormal short circuit or micro short circuit occurs to cause the burning of the charging wire.
And over-temperature protection is added on a plurality of charging circuits, and the power supply is cut off when the temperature reaches a set value. Specifically, many schemes collect temperature by adding an ADC and then control to turn off the power input. However, since the ADC needs to be added to acquire the temperature in real time, the cost of use is increased, and the complexity of the charging terminal circuit is increased.
SUMMERY OF THE UTILITY MODEL
In view of the above, it is necessary to provide a charging terminal over-temperature and over-voltage protection circuit and a chargeable device in response to the above problems.
A charging terminal over-temperature and over-voltage protection circuit applied to a chargeable device and connected with a power input terminal of the chargeable device, comprising: the overvoltage protection device comprises an anti-surge module, an over-temperature protection module and an overvoltage protection module;
the first end of the surge prevention module is connected with the power input end, and the second end of the surge prevention module is grounded;
the input end of the overvoltage protection module is connected with the input end of the power supply, and the output end of the overvoltage protection module is connected with the rechargeable equipment;
the first end of the over-temperature protection module is connected with the power input end, the second end of the over-temperature protection module is grounded, the third end of the over-temperature protection module is connected with the enabling end of the overvoltage protection module, and the over-temperature protection module is used for driving the overvoltage protection module to be started.
In one embodiment, the surge protection module comprises a transient diode, a cathode of the transient diode is a first end of the surge protection module, and an anode of the transient diode is a second end of the surge protection module.
In one embodiment, the overvoltage protection module includes an overvoltage protection circuit chip, an input end of the overvoltage protection circuit chip is an input end of the overvoltage protection module, and an output end of the overvoltage protection circuit chip is an output end of the overvoltage protection module; and the enabling end of the overvoltage protection circuit chip is the enabling end of the overvoltage protection module.
In one embodiment, when the overvoltage protection circuit chip is started, the charging terminal over-temperature overvoltage protection circuit is in an open circuit state.
In one embodiment, the over-temperature protection module includes: a fixed value resistor and a thermistor;
the first end of the fixed resistor is connected with the power supply input end, and the second end of the fixed resistor is connected with the first end of the thermistor; the second end of the thermistor is grounded. The enabling end of the overvoltage protection module is connected with the first end of the thermistor.
In one embodiment, the resistance value of the thermistor decreases with increasing temperature;
and when the enabling terminal voltage of the overvoltage protection module is greater than or equal to a preset threshold value, the overvoltage protection module is started.
In one embodiment, the over-temperature protection module further includes: a linear regulator;
the first end of the linear voltage stabilizer is connected with the power input end, and the second end of the linear voltage stabilizer is connected with the first end of the fixed value resistor.
In one embodiment, the over-temperature protection module further includes: a voltage detection module;
the output end of the voltage detection module is connected with the enabling end of the overvoltage protection module, and the voltage detection end of the voltage detection module is connected with the first end of the thermistor.
In one embodiment, the voltage detection module comprises a voltage detection integrated chip;
the input end of the voltage detection integrated chip is connected with the power input end, the detection end of the voltage detection integrated chip is the detection end of the voltage detection module, and the output end of the voltage detection integrated chip is the output end of the detection end of the voltage detection module.
A rechargeable device comprises the charging end over-temperature and over-voltage protection circuit.
The utility model provides a charge end excess temperature overvoltage crowbar and chargeable equipment. The surge prevention module is added, so that the occurrence of instantaneous overvoltage is avoided; through increasing excess temperature protection module and overvoltage protection module, prevent that unusual short circuit or circuit abnormal temperature are too high to burn out the charging wire, improve the security of charging.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings 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 these drawings without creative efforts.
Wherein:
FIG. 1 is a schematic circuit diagram of a charging terminal over-temperature/over-voltage protection circuit according to a first embodiment;
FIG. 2 is a schematic circuit diagram of a charging terminal over-temperature/over-voltage protection circuit according to a second embodiment;
FIG. 3 is a schematic circuit diagram of a charging terminal over-temperature/over-voltage protection circuit according to a third embodiment;
fig. 4 is a circuit diagram of a charging terminal over-temperature and over-voltage protection circuit in a fourth embodiment.
Detailed Description
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.
In the embodiment of the present invention, there is provided a charging terminal over-temperature and over-voltage protection circuit, as shown in fig. 1, the charging terminal over-temperature and over-voltage protection circuit is applied to a rechargeable device 300, and is connected to a power input end 200 of the rechargeable device 300, and the charging terminal over-temperature and over-voltage protection circuit includes: an anti-surge module 110, an over-temperature protection module 120, and an overvoltage protection module 130.
The first end 111 of the surge protection module 110 is connected to the power input end 200, and the second end 112 of the surge protection module 110 is grounded. The input 131 of the overvoltage protection module 130 is connected to the power input 200, and the output 132 of the overvoltage protection module 130 is connected to the rechargeable device 300. The first end 121 of the over-temperature protection module 120 is connected to the power input end 200, the second end 122 of the over-temperature protection module 120 is grounded, the third end 123 of the over-temperature protection module 120 is connected to the enable end 133 of the overvoltage protection module 130, and the over-temperature protection module 120 is configured to drive the overvoltage protection module 130 to start.
Specifically, when a peak current or voltage suddenly occurs in the charging terminal over-temperature and over-voltage protection circuit, the anti-surge module 110 switches on and shunts the current in a very short time, so as to prevent the rechargeable device 300 from being damaged by the surge. When the temperature in the charging terminal over-temperature and over-voltage protection circuit gradually increases, the over-temperature protection module 120 controls the voltage of the enable terminal of the over-voltage protection module 130 to increase, and when the voltage of the enable terminal of the over-voltage protection module 130 is greater than or equal to the preset threshold, the over-voltage protection module 130 starts. The overvoltage protection module 130 can protect the rechargeable device 300 by opening the circuit, reducing the voltage, and the like after being started.
The embodiment of the utility model avoids the occurrence of instantaneous overvoltage by adding the surge prevention module 110; by adding the over-temperature protection module 120 and the over-voltage protection module 130, the charging wire is prevented from being burnt due to abnormal short circuit or over-high circuit temperature, damage to the rechargeable device is caused, and charging safety is improved.
In one embodiment, as shown in fig. 2, anti-surge module 110 includes a transient diode TVS, where a negative electrode 411 of transient diode TVS is first end 111 of anti-surge module 110, and a positive electrode 412 of transient diode TVS is second end 112 of anti-surge module 110. The overvoltage protection module 130 includes an overvoltage protection circuit chip OVP, an input terminal VIN of the overvoltage protection circuit chip OVP is an input terminal 131 of the overvoltage protection module 130, an output terminal VOUT of the overvoltage protection circuit chip OVP is an output terminal 132 of the overvoltage protection module 130, and an enable terminal EN of the overvoltage protection circuit chip OVP is an enable terminal 133 of the overvoltage protection module 130. The over-temperature protection module 120 includes: a constant value resistor R and a thermistor NTC. The first end 421 of the fixed resistor R is connected to the power input end 200, and the second end 422 of the fixed resistor R is connected to the first end 423 of the thermistor NTC; the second terminal 424 of the thermistor NTC is grounded. The enable terminal EN of the overvoltage protection module 130 is connected to the first terminal 423 of the thermistor NTC.
Specifically, when the charging terminal over-temperature and over-voltage protection circuit works normally, the transient diode TVS is in a cut-off state (high resistance state), and the normal work of the line is not influenced; when the peak current or voltage is suddenly generated in the charging terminal over-temperature and over-voltage protection circuit, the transient diode TVS immediately changes from the high resistance state to the low resistance state, so as to provide a low resistance conduction path for the peak current or voltage, thereby preventing the rechargeable device 300 from being damaged by the surge. When the peak current or voltage in the charging terminal over-temperature and over-voltage protection circuit disappears, the transient diode TVS is restored to the high impedance state.
In this embodiment, the thermistor NTC is a negative temperature coefficient thermistor, i.e. the resistance of the thermistor NTC decreases with increasing temperature. When the temperature of the current charging terminal over-temperature and over-voltage protection circuit is increased due to a line fault such as a short circuit, the resistance value of the thermistor NTC is reduced, so that the voltage of the enable terminal EN of the over-voltage protection module 130 is increased. When the voltage of the enable terminal EN of the overvoltage protection module 130 is greater than or equal to the preset threshold, the overvoltage protection module 130 is started to make the charging terminal over-temperature overvoltage protection circuit in an open circuit state. Therefore, the charging wire is prevented from being burnt out due to abnormal short circuit or over-high abnormal circuit temperature, and the charging safety is improved.
In another embodiment, as shown in fig. 3, the over-temperature protection module 120 further includes: linear voltage regulator LDO. The first terminal 425 of the linear regulator LDO is connected to the power input terminal 200, and the second terminal 426 of the linear regulator LDO is connected to the first terminal 421 of the fixed-value resistor R.
Specifically, the LDO can convert an input voltage into a lower and stable output voltage. The input voltage of the power input end 200 influenced by the power grid may fluctuate, and even if the voltage of the input linear regulator LDO fluctuates, the voltage of the output linear regulator LDO can still be kept stable and unchanged through the voltage stabilizing effect of the linear regulator LDO, so that the more accurate detection temperature of the thermistor NTC is ensured.
In yet another embodiment, the over-temperature protection module 120 further includes: and a voltage detection module. The output end of the voltage detection module is connected to the enable end EN of the overvoltage protection module 130, and the voltage detection end of the voltage detection module is connected to the first end 423 of the thermistor NTC. Illustratively, as shown in fig. 4, the voltage detection module includes a voltage detection integrated chip; the input end Vin of the voltage detection integrated chip is connected to the power input end 200, the detection end Vsen of the voltage detection integrated chip is the detection end of the voltage detection module, and the output end Vout of the voltage detection integrated chip is the output end of the voltage detection module.
In this embodiment, the voltage detection ic can accurately detect the voltage within a specific voltage range, so that more accurate detection of the voltage of the thermistor NTC can be realized. Meanwhile, the cost of the voltage detection integrated chip is lower than that of the ADC collector, so that the detection cost of the voltage can be reduced to a certain degree.
Based on same utility model conceive, the embodiment of the utility model provides a still provide a chargeable equipment, including the end of charging excess temperature overvoltage crowbar as above arbitrary embodiment.
It should be noted that the implementation of the rechargeable device in this embodiment is consistent with the idea of implementing the charging terminal over-temperature and over-voltage protection circuit in any of the above embodiments, and the implementation principle thereof is not described herein again, and specific reference may be made to the corresponding contents in the above embodiments of the charging terminal over-temperature and over-voltage protection circuit.
The embodiment of the utility model also provides a rechargeable device, which avoids the occurrence of instantaneous overvoltage by adding the surge prevention module; still through increasing excess temperature protection module and overvoltage protection module, prevent that unusual short circuit or circuit abnormal temperature are too high to burn out the charging wire, improve the security of charging.
The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A charging terminal over-temperature and over-voltage protection circuit, wherein the charging terminal over-temperature and over-voltage protection circuit is applied to a rechargeable device and is connected with a power input terminal of the rechargeable device, and the charging terminal over-temperature and over-voltage protection circuit comprises: the overvoltage protection device comprises an anti-surge module, an over-temperature protection module and an overvoltage protection module;
the first end of the surge prevention module is connected with the power input end, and the second end of the surge prevention module is grounded;
the input end of the overvoltage protection module is connected with the input end of the power supply, and the output end of the overvoltage protection module is connected with the rechargeable equipment;
the first end of the over-temperature protection module is connected with the power input end, the second end of the over-temperature protection module is grounded, the third end of the over-temperature protection module is connected with the enabling end of the overvoltage protection module, and the over-temperature protection module is used for driving the overvoltage protection module to be started.
2. The charging-end over-temperature and over-voltage protection circuit according to claim 1, wherein the surge protection module comprises a transient diode, a cathode of the transient diode is a first end of the surge protection module, and an anode of the transient diode is a second end of the surge protection module.
3. The charging terminal over-temperature and over-voltage protection circuit according to claim 1, wherein the over-voltage protection module comprises an over-voltage protection circuit chip, an input terminal of the over-voltage protection circuit chip is an input terminal of the over-voltage protection module, and an output terminal of the over-voltage protection circuit chip is an output terminal of the over-voltage protection module; and the enabling end of the overvoltage protection circuit chip is the enabling end of the overvoltage protection module.
4. The charging terminal over-temperature and over-voltage protection circuit as claimed in claim 3, wherein when the over-voltage protection circuit chip is activated, the charging terminal over-temperature and over-voltage protection circuit is in an open circuit state.
5. The charging terminal over-temperature and over-voltage protection circuit according to claim 1, wherein the over-temperature protection module comprises: a fixed value resistor and a thermistor;
the first end of the fixed resistor is connected with the power supply input end, and the second end of the fixed resistor is connected with the first end of the thermistor; the second end of the thermistor is grounded, and the enabling end of the overvoltage protection module is connected with the first end of the thermistor.
6. The charging terminal over-temperature and over-voltage protection circuit as claimed in claim 5, wherein the resistance of the thermistor decreases with increasing temperature;
and when the enabling terminal voltage of the overvoltage protection module is greater than or equal to a preset threshold value, the overvoltage protection module is started.
7. The charging terminal over-temperature and over-voltage protection circuit according to claim 5, wherein the over-temperature protection module further comprises: a linear regulator;
the first end of the linear voltage stabilizer is connected with the power input end, and the second end of the linear voltage stabilizer is connected with the first end of the fixed value resistor.
8. The charging terminal over-temperature and over-voltage protection circuit according to claim 5, wherein the over-temperature protection module further comprises: a voltage detection module;
the output end of the voltage detection module is connected with the enabling end of the overvoltage protection module, and the voltage detection end of the voltage detection module is connected with the first end of the thermistor.
9. The charging terminal over-temperature and over-voltage protection circuit according to claim 8, wherein the voltage detection module comprises a voltage detection integrated chip;
the input end of the voltage detection integrated chip is connected with the power input end, the detection end of the voltage detection integrated chip is the detection end of the voltage detection module, and the output end of the voltage detection integrated chip is the output end of the detection end of the voltage detection module.
10. A rechargeable device comprising a charging terminal over-temperature and over-voltage protection circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021190366.7U CN212085868U (en) | 2020-06-23 | 2020-06-23 | Charging terminal over-temperature and over-voltage protection circuit and rechargeable equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021190366.7U CN212085868U (en) | 2020-06-23 | 2020-06-23 | Charging terminal over-temperature and over-voltage protection circuit and rechargeable equipment |
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| Publication Number | Publication Date |
|---|---|
| CN212085868U true CN212085868U (en) | 2020-12-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021190366.7U Active CN212085868U (en) | 2020-06-23 | 2020-06-23 | Charging terminal over-temperature and over-voltage protection circuit and rechargeable equipment |
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| CN (1) | CN212085868U (en) |
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- 2020-06-23 CN CN202021190366.7U patent/CN212085868U/en active Active
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