CN214543701U - Charging interface short-circuit protection circuit and electric equipment - Google Patents
Charging interface short-circuit protection circuit and electric equipment Download PDFInfo
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- CN214543701U CN214543701U CN202120572647.7U CN202120572647U CN214543701U CN 214543701 U CN214543701 U CN 214543701U CN 202120572647 U CN202120572647 U CN 202120572647U CN 214543701 U CN214543701 U CN 214543701U
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Abstract
The utility model provides an interface short-circuit protection circuit and consumer charge, interface short-circuit protection circuit charges includes temperature detection module, processing module and switch module, wherein: the temperature detection module is used for sampling the ambient temperature around the charging interface, generating and sending a temperature detection signal corresponding to the ambient temperature to the processing module; the processing module is used for receiving the temperature detection signal and sending a power-off signal to the switch module when the temperature detection signal reaches a preset short-circuit condition; and the switch module is used for sending a short-circuit signal to a power input pin of the charging interface when receiving the power-off signal. Whether a short circuit occurs or not is judged by detecting the temperature of the charging interface through the temperature detection module, and a short circuit signal is sent to a power input pin of the charging interface when the short circuit occurs, so that the charging interface sends the short circuit signal to the power adapter, the power adapter starts short circuit protection, power supply for the charging interface is stopped, and safety accidents are avoided.
Description
Technical Field
The utility model relates to a circuit protection technical field especially relates to an interface short-circuit protection circuit and consumer charge.
Background
The circuit board of the existing electronic equipment is wrapped in the shell, so that the waterproof function can be realized; the portable electronic equipment needs to be provided with a charging interface for charging an internal battery, and the charging interface needs to be opened to be connected with a power adapter; therefore, when water enters the charging interface, the circuit board is easily short-circuited to burn components and parts, so that the product is damaged, and even the adhesive part is possibly ignited to cause safety accidents.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a main aim at provides an interface short-circuit protection circuit and consumer charge, aims at solving prior art and charges the problem that the interface short circuit of intaking caused the incident.
In order to achieve the above object, the present invention provides a charging interface short-circuit protection circuit, which comprises a temperature detection module, a processing module and a switch module; the output of temperature detect module is connected with processing module's temperature detect end, and processing module's output is connected with switch module's control end, and switch module's output is connected with the power input pin of the interface that charges, wherein:
the temperature detection module is used for sampling the ambient temperature around the charging interface, generating and sending a temperature detection signal corresponding to the ambient temperature to the processing module;
the processing module is used for receiving the temperature detection signal and sending a power-off signal to the switch module when the temperature detection signal reaches a preset short-circuit condition;
and the switch module is used for sending a short-circuit signal to a power input pin of the charging interface when receiving the power-off signal.
In one possible embodiment, the temperature detection module comprises at least one temperature detection unit comprising a thermistor and a first resistor, wherein:
the first end of the thermistor is connected with the temperature detection end of the processing module, the first end of the thermistor is also connected with the power supply through the first resistor, and the second end of the thermistor is grounded.
In a possible embodiment, the temperature detection unit further comprises a filtering subunit, and the filtering subunit is connected to the first end of the thermistor.
In one possible embodiment, the thermistor is a positive temperature coefficient thermistor.
In one possible embodiment, the switching module comprises a switching tube, wherein:
the control end of switch tube is connected with processing module's output, and the input of switch tube is connected with the power input pin of the interface that charges, and the output ground connection of switch tube.
In a possible implementation manner, the switch tube is an NMOS tube, a gate of the NMOS tube is a control end of the switch tube, a drain of the NMOS tube is an input end of the switch tube, and a source of the NMOS tube is an output end of the switch tube.
In one possible embodiment, the switching module further comprises a second resistor, wherein:
the first end of the second resistor is connected with the grid electrode of the NMOS tube, and the second end of the second resistor is grounded.
In one possible embodiment, the processing module is an MCU.
Furthermore, in order to achieve the above object, the utility model also provides an electric equipment, electric equipment includes as foretell interface short-circuit protection circuit and the interface that charges.
In one possible embodiment, the charging interface is a Type-C interface.
The utility model provides a pair of interface short-circuit protection circuit and consumer charge detects the temperature of the interface that charges through temperature detection module and judges whether take place the short circuit, sends short-circuit signal to the power input pin of the interface that charges when taking place the short circuit to make the interface that charges send short-circuit signal to power adapter, so that power adapter starts short-circuit protection, stop for the interface power supply that charges, avoid the emergence of incident.
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 functional block diagram of an embodiment of the short-circuit protection circuit of the charging interface of the present invention;
fig. 2 is a circuit structure diagram of the charging interface short-circuit protection circuit of the present invention applied in 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) |
| 100 | Temperature detection module | TR1 | |
| 101 | Temperature detection unit | R1 | A |
| 200 | Processing module | R2 | |
| 300 | Switch module | Q1 | NMOS tube |
| VDD | Power supply | VBUS | Power input pin |
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 directional indicators (such as up, down, left, right, front, and back) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the motion situation, and the like 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 an interface short-circuit protection circuit charges is applied to the consumer, and this consumer can be the cell-phone, panel computer etc. please see figure 1, and figure 1 is the utility model discloses the functional module diagram of an interface short-circuit protection circuit embodiment charges. In this embodiment, the charging interface short-circuit protection circuit includes a temperature detection module 100, a processing module 200, and a switch module 300; the output of temperature detect module 100 is connected with the temperature detect end of processing module 200, and the output of processing module 200 is connected with switch module 300's control end, and switch module 300's output is connected with the power VDD input pin of the interface that charges (not marking), wherein:
the temperature detection module 100 is configured to sample an ambient temperature around the charging interface, generate and send a temperature detection signal corresponding to the ambient temperature to the processing module 200;
the processing module 200 is configured to receive the temperature detection signal, and send a power-off signal to the switch module 300 when the temperature detection signal reaches a preset short-circuit condition; the processing module 200 is an MCU;
the switch module 300 is configured to send a short-circuit signal to a power supply VDD input pin of the charging interface when receiving the power-off signal.
When a water inlet phenomenon or foreign matters exist in the charging interface, a short-circuit fault may occur, and when the short-circuit fault occurs in the charging interface, the charging interface is caused to generate heat, so that the ambient temperature around the charging interface can be detected by arranging the temperature detection module 100 at the charging interface, a corresponding temperature detection signal is sent to the processing module 200, and the processing module 200 judges whether the short-circuit fault occurs in the charging interface according to the temperature detection signal.
It can be understood that the charging interface of the electric equipment is charged through the power adapter, and when the charging interface is not charged, no voltage passes through, so that the problem of short circuit can not occur even if the charging interface has a water inlet phenomenon or foreign matters; only when the charging is carried out through the power adapter, voltage exists in the charging interface, and short-circuit faults are caused due to water inflow phenomena or foreign matters; therefore, it can be determined that the charging interface is in a connected state with the power adapter when the short-circuit fault occurs. The existing power adapters can pass national security certification, such as 3C certification, only by arranging an overcurrent protection device; therefore, when the short-circuit fault of the charging interface is detected, the short-circuit signal can be sent to the power adapter through the power supply VDD input pin, so that the overcurrent protection device of the power adapter is triggered, and the charging of the electric equipment is stopped.
The preset short-circuit condition can be specifically a preset short-circuit temperature value, and when the temperature value in the temperature detection signal is smaller than the preset short-circuit temperature value, the charging interface is considered to have no short-circuit fault; and when the temperature value in the temperature detection signal is greater than or equal to the preset short-circuit temperature value, the charging interface is considered to have a short-circuit fault.
Whether the short circuit occurs is judged by detecting the temperature of the charging interface through the temperature detection module 100, and the short circuit signal is sent to the power supply VDD input pin of the charging interface when the short circuit occurs, so that the charging interface sends the short circuit signal to the power adapter, the power adapter starts short circuit protection, power supply for the charging interface is stopped, and safety accidents are avoided.
Further, referring to fig. 2, the temperature detection module 100 includes at least one temperature detection unit 101, and the temperature detection unit 101 includes a thermistor TR1 and a first resistor R1, wherein:
the first terminal of the thermistor TR1 is connected to the temperature detection terminal of the process module 200, the first terminal of the thermistor TR1 is also connected to the power supply VDD through the first resistor R1, and the second terminal of the thermistor TR1 is grounded.
The thermistor TR1 is an element sensitive to the environmental temperature, and is divided into a positive temperature coefficient thermistor TR1 and a negative temperature coefficient thermistor TR1 according to different temperature coefficients; the resistance value of the positive temperature coefficient thermistor TR1 increases along with the rise of the ambient temperature, and the resistance value of the negative temperature coefficient thermistor TR1 decreases along with the rise of the ambient temperature; the temperature of the charging interface can be detected by the thermistor TR 1. The positive temperature coefficient thermistor TR1 is mainly used for overcurrent and overload, short-circuit protection, lighting soft switch time delay, motor starting, temperature sensing and protection, automatic regulation heating and the like; the ntc thermistor TR1 is mainly used for inrush current suppression, temperature sensing measurement, temperature compensation, temperature control, and the like. Therefore, the present embodiment employs the positive temperature coefficient thermistor TR1 to detect the ambient temperature of the charging interface.
The power supply VDD, the first resistor R1 and the thermistor TR1 form a voltage division circuit, the processing unit detects the voltage of the thermistor TR1, the resistance value of the thermistor TR1 can be obtained according to a voltage division formula through the voltage of the power supply VDD and the resistance value of the first resistor R1, and the temperature of the surrounding environment of the charging interface can be obtained according to the corresponding relation between the temperature and the resistance value of the thermistor TR 1. It should be noted that, in this embodiment, since the corresponding relationship between the temperature and the resistance value in the thermistor TR1 is fixed, the determination of whether the short-circuit fault occurs may be directly performed through the voltage detected by the processing unit, that is, the preset short-circuit condition is the preset short-circuit voltage value, and when the detected voltage value is greater than or equal to the preset short-circuit voltage value, the short-circuit fault occurs at the charging interface.
The number of the temperature detection units 101 can be set according to actual needs; in this embodiment, two temperature detection units 101 are provided, and the temperature detection units 101 are respectively disposed at different positions of the charging interface, such as the left side and the right side; the processing units respectively receive the temperature detection data of the temperature detection units 101, process the temperature detection data, for example, take a maximum value or an average value, and further determine whether the charging interface has a short-circuit fault according to the processed temperature detection data.
Further, the temperature detecting unit 101 further includes a filtering subunit (not shown), and the filtering subunit is connected to the first end of the thermistor TR 1.
The filtering subunit is used for filtering out specific band frequencies in the signal so as to achieve the effect of suppressing and preventing interference. In particular, the filtering subunit may comprise a capacitor connected between a first terminal of the thermistor TR1 and ground.
Further, the switch module 300 comprises a switch tube, wherein:
the control end of the switch tube is connected with the output end of the processing module 200, the input end of the switch tube is connected with the power supply VDD input pin of the charging interface, and the output end of the switch tube is grounded.
When the charging interface is not short-circuited, the processing module 200 sends a charging signal to the switching tube, the switching tube disconnects the power supply VDD input pin from the ground when receiving the charging signal, and at the moment, the power adapter normally charges the electric equipment; when the charging interface has a short-circuit fault, the processing module 200 sends a power-off signal to the switching tube, the switching tube switches on the connection between the power supply VDD input pin and the ground when receiving the power-off signal, and at this time, the anode of the power adapter is directly grounded, so that the power adapter is short-circuited to trigger overcurrent protection, and the power adapter stops charging the electric equipment.
Further, the switch tube is an NMOS tube Q1, the gate of the NMOS tube Q1 is the control end of the switch tube, the drain of the NMOS tube Q1 is the input end of the switch tube, and the source of the NMOS tube Q1 is the output end of the switch tube.
When the switch transistor is an NMOS transistor Q1, if the charging interface does not have a short-circuit fault, the processing module 200 sends a low level signal to the NMOS transistor Q1, so that the NMOS transistor Q1 is turned off; if the charging interface has a short-circuit fault, the processing module 200 sends a high level signal to the NMOS transistor Q1 to turn on the NMOS transistor Q1.
The switch module 300 further comprises a second resistor R2, wherein:
the first end of the second resistor R2 is connected with the gate of the NMOS transistor Q1, and the second end of the second resistor R2 is grounded.
The second resistor R2 is a pull-down resistor, and is used to clamp the base potential at a low level when the base of the NMOS transistor Q1 does not receive a high level signal, so as to avoid the false triggering of the NMOS transistor Q1 caused by signal interference.
It can be understood that a person skilled in the art can select the type of the switching tube according to the circuit requirement and the properties of different switching tubes, such as a PMOS tube, a triode, and the like, and the specific selection method is not described herein again. It can be understood that the change of the type of the switch tube requires the corresponding adjustment of the signal of the processing module 200 and the second resistor R2, for example, when the switch tube is PMOS tube, the second resistor R2 is set as a pull-up resistor, and the processing module 200 sends a high level signal when the charging interface is not short-circuited, and sends a low level signal when the charging interface is short-circuited. Other types of switch tubes can be correspondingly arranged according to the properties of the switch tubes, and are not described herein.
According to the embodiment, the power adapter can reasonably stop charging the electric equipment when the charging interface has a short-circuit fault.
The utility model discloses still protect an electric equipment, this electric equipment is including the interface short-circuit protection circuit that charges and the interface that charges, and the above-mentioned embodiment can be referred to the structure of the interface short-circuit protection circuit that should charge, no longer gives unnecessary details here. It should be understood that, because the electric device in this embodiment adopts the technical solution of the charging interface short-circuit protection circuit, the electric device has all the beneficial effects of the charging interface short-circuit protection circuit.
Further, the interface that charges is Type-C interface.
The charging interface can also be a Mini USB interface, a Micro USB interface, a Lightning interface, and the like.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. The term "comprising", without further limitation, means that the element so defined is not excluded from the group of processes, methods, articles, or systems that include the element. The above embodiment numbers of the present invention are only for description, and do not represent the advantages and disadvantages of the embodiments.
The above is only the preferred embodiment of the present invention, and not the scope of the present invention, all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings or the direct or indirect application in other related technical fields are included in the patent protection scope of the present invention.
Claims (10)
1. A short-circuit protection circuit of a charging interface is characterized by comprising a temperature detection module, a processing module and a switch module; the output end of the temperature detection module is connected with the temperature detection end of the processing module, the output end of the processing module is connected with the control end of the switch module, and the output end of the switch module is connected with the power input pin of the charging interface, wherein:
the temperature detection module is used for sampling the ambient temperature around the charging interface, generating and sending a temperature detection signal corresponding to the ambient temperature to the processing module;
the processing module is used for receiving the temperature detection signal and sending a power-off signal to the switch module when the temperature detection signal reaches a preset short-circuit condition;
and the switch module is used for sending a short-circuit signal to a power input pin of the charging interface when receiving the power-off signal.
2. The circuit of claim 1, wherein the temperature detection module comprises at least one temperature detection unit comprising a thermistor and a first resistor, wherein:
the first end of the thermistor is connected with the temperature detection end of the processing module, the first end of the thermistor is also connected with a power supply through the first resistor, and the second end of the thermistor is grounded.
3. The circuit of claim 2, wherein the temperature sensing unit further comprises a filtering subunit, the filtering subunit being connected to the first end of the thermistor.
4. The circuit of claim 3, wherein the thermistor is a positive temperature coefficient thermistor.
5. The circuit of any of claims 1-4, wherein the switch module comprises a switch tube, wherein:
the control end of the switch tube is connected with the output end of the processing module, the input end of the switch tube is connected with the power input pin of the charging interface, and the output end of the switch tube is grounded.
6. The circuit of claim 5, wherein the switch transistor is an NMOS transistor, a gate of the NMOS transistor is a control terminal of the switch transistor, a drain of the NMOS transistor is an input terminal of the switch transistor, and a source of the NMOS transistor is an output terminal of the switch transistor.
7. The circuit of claim 6, wherein the switch module further comprises a second resistor, wherein:
the first end of the second resistor is connected with the grid electrode of the NMOS tube, and the second end of the second resistor is grounded.
8. The circuit of claim 5, wherein the processing module is an MCU.
9. An electric device, characterized in that the electric device comprises the charging interface short-circuit protection circuit and the charging interface according to any one of claims 1 to 8.
10. The powered device as claimed in claim 9, wherein the charging interface is a Type-C interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120572647.7U CN214543701U (en) | 2021-03-19 | 2021-03-19 | Charging interface short-circuit protection circuit and electric equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120572647.7U CN214543701U (en) | 2021-03-19 | 2021-03-19 | Charging interface short-circuit protection circuit and electric equipment |
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| Publication Number | Publication Date |
|---|---|
| CN214543701U true CN214543701U (en) | 2021-10-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120572647.7U Active CN214543701U (en) | 2021-03-19 | 2021-03-19 | Charging interface short-circuit protection circuit and electric equipment |
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| CN (1) | CN214543701U (en) |
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- 2021-03-19 CN CN202120572647.7U patent/CN214543701U/en active Active
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