CN113949129A - Charging interface protection device of electronic equipment and electronic equipment - Google Patents
Charging interface protection device of electronic equipment and electronic equipment Download PDFInfo
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0042—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/66—Structural association with built-in electrical component
- H01R13/665—Structural association with built-in electrical component with built-in electronic circuit
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/66—Structural association with built-in electrical component
- H01R13/665—Structural association with built-in electrical component with built-in electronic circuit
- H01R13/6666—Structural association with built-in electrical component with built-in electronic circuit with built-in overvoltage protection
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/66—Structural association with built-in electrical component
- H01R13/70—Structural association with built-in electrical component with built-in switch
- H01R13/703—Structural association with built-in electrical component with built-in switch operated by engagement or disengagement of coupling parts, e.g. dual-continuity coupling part
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
- H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides a charging interface protection device of electronic equipment and the electronic equipment, the device includes: a circuit board; the charging socket is arranged on the circuit board and is used for being electrically connected with the power adapter; the thermosensitive element is arranged in the circuit board and close to the charging socket; the protection circuit has an input end connected with the thermosensitive element and an output end connected with the charging socket, and is used for short-circuiting the power adapter through the charging socket under the condition of receiving a first voltage signal input by the thermosensitive element. The device sets up the thermal element through being close to the socket department that charges on electronic equipment's circuit board, when the thermal element reaches high temperature trigger threshold value, triggers protection circuit work, short circuit power adapter's output circuit makes the adapter get into the protected state to improve the security of charging process, guarantee charging efficiency, can also effectively prolong electronic equipment's life.
Description
Technical Field
The invention relates to the technical field of battery charging, in particular to a charging interface protection device of electronic equipment and the electronic equipment.
Background
Along with the development of science and technology, electronic equipment such as cell-phone, flat board is numerous day by day, and the interface that charges that current electronic equipment set up adopts open structural design more, and this kind of open structure permeates foreign matters such as water stain, salt stain, sweat and dust fines easily, influences electronic equipment's the use of charging, further causes charging loop's in the electronic equipment resistive failure, leads to electronic equipment to take place local heating, not only influences charge efficiency, can also lead to the emergence of incident such as conflagration.
Disclosure of Invention
The invention provides a charging interface protection device of electronic equipment and the electronic equipment, which are used for solving the problem that the charging efficiency is influenced by local heating of the electronic equipment during charging in the prior art and realizing safe charging of the electronic equipment.
The invention provides a charging interface protection device of electronic equipment, comprising:
a circuit board;
the charging socket is arranged on the circuit board and is used for being electrically connected with a power adapter;
a thermal element disposed in the circuit board proximate to the charging socket;
the input end of the protection circuit is connected with the thermosensitive element, the output end of the protection circuit is connected with the charging socket, and the protection circuit is used for short-circuiting the power adapter through the charging socket under the condition of receiving a first voltage signal input by the thermosensitive element.
According to the charging interface protection device of the electronic equipment, the protection circuit is further used for disconnecting the short-circuit loop of the power adapter through the charging socket under the condition that the second voltage signal input by the thermosensitive element is received.
According to the charging interface protection device of the electronic equipment provided by the invention, the protection circuit comprises:
a comparator;
a reference element group connected between an apparatus power supply of an electronic apparatus and a first input terminal of the comparator, the reference element group being configured to input a reference voltage signal to the comparator;
and the voltage dividing element group is connected between the thermosensitive element and the second input end of the comparator, the thermosensitive element is connected with the equipment power supply, and the voltage dividing element group and the thermosensitive element are used for inputting temperature control voltage signals to the comparator together.
According to the charging interface protection device of the electronic device provided by the invention, the protection circuit further comprises:
the electronic switch is connected between the output end of the comparator and the charging socket, and the comparator is used for outputting a target control signal to the electronic switch to control the on-off state of the electronic switch.
According to the charging interface protection device of the electronic equipment, the electronic switch is an N-channel field effect transistor.
According to the charging interface protection device of the electronic equipment, provided by the invention, the comparator is used for outputting a first control signal to the electronic switch under the condition that the received temperature control voltage signal is greater than the reference voltage signal, controlling the electronic switch to be closed and short-circuiting the power adapter.
According to the charging interface protection device of the electronic equipment, provided by the invention, the comparator is used for outputting a second control signal to the electronic switch to control the electronic switch to be disconnected and disconnect a short-circuit loop of the power adapter under the condition that the received temperature control voltage signal is smaller than the reference voltage signal.
According to the charging interface protection device of the electronic device provided by the invention, the voltage dividing element group comprises:
a first voltage dividing element in series with the thermal element;
a second voltage dividing element connected in series with the thermosensitive element and connected in parallel with the first voltage dividing element;
and the anode of the diode is connected with the second voltage-dividing element, and the cathode of the diode is connected with the output end of the comparator.
According to a charging interface protection device of an electronic device provided by the present invention, the reference element group includes:
a first reference element;
a second reference element in parallel with the first reference element.
According to the charging interface protection device of the electronic equipment, the protection circuit is further used for outputting a warning feedback signal under the condition that the first voltage signal input by the thermosensitive element is received.
The present invention also provides an electronic device comprising:
an apparatus main body;
the charging interface protection device of the electronic device as described above is provided on the device body.
According to the charging interface protection device of the electronic equipment and the electronic equipment, the thermosensitive element is arranged on the circuit board of the electronic equipment and close to the charging socket, when the thermosensitive element reaches a high-temperature triggering threshold value, the protection circuit is triggered to work, the output loop of the power adapter is in short circuit, the safety of the charging process is improved, the charging efficiency is ensured, and the service life of the electronic equipment can be effectively prolonged.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a charging interface protection device of an electronic device according to the present invention;
fig. 2 is a schematic diagram of a protection circuit of the charging interface protection device provided by the invention.
Reference numerals:
1: a power adapter; 2: a power supply data line; 3: a data line interface;
4: a charging socket; 5: an apparatus body; 6: a circuit board;
7: a thermosensitive element; 8: and a protection circuit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only used for simplifying the description of the embodiments of the present invention, and do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific situations.
In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
The charging interface protection device of the electronic device according to the present invention is described below with reference to fig. 1 and 2, and the charging interface protection device is installed in the electronic device, so that the charging safety of the electronic device can be effectively improved.
In the embodiment of the present invention, the electronic device may be a mobile phone, a tablet computer, a notebook computer, a wearable device, a recording pen, a translator, an electronic book reader, a wireless headset, an intelligent robot, or other electronic devices.
As shown in fig. 1, the charging interface protection device for an electronic device according to the present invention includes: circuit board 6, charging socket 4, heat-sensitive element 7 and protection circuit 8.
The Circuit Board 6 is also called a Printed Circuit Board (PCB) 6, and the Circuit Board 6 has the characteristics of high wiring density, light weight, thin thickness, good bending property, and the like.
The circuit board 6 may be disposed in the device body 5 of the electronic device, and different functions may be implemented by the circuit board 6 by disposing different devices on the circuit board 6.
In this embodiment, the circuit board 6 is provided with a charging socket 4, and the charging socket 4 is used for electrical connection with the power adapter 1.
In practical implementation, the charging socket 4 may be embedded at an edge position of the circuit board 6, so as to be matched with the data line interface 3 of the power adapter 1.
The power adapter 1 is a power conversion device for supplying power to the electronic device, and the power adapter 1 may include components such as a housing, a transformer, an inductor, and a capacitor.
One end of the power adapter 1 is used for connecting an external charging power supply, and the voltage value of the external charging power supply may be 220V.
The other end of the power adapter 1 is connected with a power data line 2, and one end of the power data line 2 is a data line interface 3 for connecting with a charging socket 4.
The interface types of the data line interface 3 include, but are not limited to, USB interfaces, Type-C interfaces, Micro-USB interfaces, and other interface types.
In this embodiment, the interface type of the charging jack 4 matches the interface type of the data line interface 3.
For example, as shown in fig. 1, the interface Type of the charging socket 4 is Type-C female socket, and the corresponding data line interface 3 is Type-C interface.
In actual implementation, the type of the power adapter 1, the material and specification of the power data line 2, the number of cores, and other specifications may be selected according to actual applications, which is not limited in the embodiment of the present invention.
When the electronic device is charged, the data line interface 3 on the power data line 2 is in contact fit with a charging socket 4 in the electronic device, and the power adapter 1 supplies power required for operation to the electronic device or charges the device power of the electronic device.
The device power supply of the electronic device may be a lithium ion battery.
The circuit board 6 is also provided with a heat sensitive element 7, and the heat sensitive element 7 is located in the circuit board 6 at a position close to the charging socket 4.
The thermosensitive element 7 is made of a sensitive material with physical properties changing with temperature, and the resistance value of the thermosensitive element 7 can change with temperature.
The heat sensitive element 7 is located in the circuit board 6 at a position close to the charging socket 4, and the heat sensitive element 7 can sensitively detect a change in temperature at the charging socket 4.
The thermosensitive element 7 may be a negative temperature coefficient thermosensitive element.
In the process of supplying power to the electronic device or charging the electronic device by the power adapter 1, heat may be generated at the position where the data line interface 3 is matched with the charging socket 4 due to the penetration of foreign matters.
Due to the existence of foreign matters, a micro short circuit or an electrochemical reaction may occur at the matching position of the data line interface 3 and the charging socket 4, the power adapter 1 and the internal circuit of the electronic device cannot sense the weak changes of the load and the current, and effective power failure or warning measures cannot be given.
With the continuous progress of micro short circuit and electrochemical reaction, a large amount of heat is generated and accumulated at the matching part of the data line interface 3 and the charging socket 4, which causes thermal damage to the components of the electronic equipment such as the equipment shell, the charging socket 4 and the power data line 2, and causes oxidation corrosion of metal elements such as copper, iron, aluminum and tin in the circuit board 6, and the salt alkalinity of foreign matters such as sweat stain also aggravates the corrosion process.
The thermal damage and the chemical damage of the electronic equipment are irreversible, which not only affects the charging efficiency of the electronic equipment, but also can reduce the service life of the electronic equipment, and even can cause safety accidents such as scalding and fire disasters when the service life of the electronic equipment is serious.
The thermistor 7 is close to the charging socket 4, and the resistance value of the thermistor 7 changes with the temperature at the charging socket 4.
The thermosensitive element 7 is exemplified as a negative temperature coefficient thermosensitive element.
When the mating part of the data line interface 3 and the charging socket 4 generates heat due to the infiltration of foreign matters, the resistance value of the negative temperature coefficient thermistor decreases with the increase of the temperature at the charging socket 4.
When the temperature at the charging socket 4 falls, the resistance value of the ntc thermistor increases as the temperature falls.
The protection circuit 8 can be arranged on the circuit board 6, the input end of the protection circuit 8 is connected with the thermosensitive element 7, and the output end of the protection circuit 8 is connected with the charging socket 4.
The thermosensitive element 7 is connected with the input end of the protection circuit 8, and when the resistance value of the thermosensitive element 7 changes along with the temperature change at the charging socket 4, the thermosensitive element 7 can output different voltage signals to the protection circuit 8.
When receiving the first voltage signal input from the thermistor 7, the protection circuit 8 short-circuits the power adapter 1 via the charging socket 4.
The first voltage signal is a voltage signal input to the protection circuit 8 by the thermistor 7 when the high-temperature trigger threshold of the thermistor 7 is reached.
It should be noted that the voltage source of the voltage signal input by the thermosensitive element 7 to the protection circuit 8 is the voltage provided by the device power supply of the electronic device, that is, the thermosensitive element 7 is connected between the device power supply and the protection circuit 8.
In practical implementation, the protection circuit 8 may control the circuit state change in the protection circuit 8 based on the first voltage signal input by the thermistor 7, so that the output loop from the power adapter 1 to the charging socket 4 is shorted, and the power adapter 1 enters an open circuit state.
The thermosensitive element 7 outputs a first voltage signal when reaching a high-temperature trigger threshold value, the trigger protection circuit 8 works, the output loop of the power adapter 1 is in short circuit, the charging work can not be continued, the temperature of the charging interface is not increased any more, the irreversible damage of the electronic equipment and the power data line 2 caused by overheating of the charging interface can be effectively prevented, and the safety of the charging process is improved.
In the related art, some structures that completely seal sensitive parts such as electronic components in an apparatus body of an electronic apparatus have appeared, and wireless charging or magnetic charging is used for charging, so that the application range of the structure is small, and most electronic apparatuses need an open structural design due to factors such as assemblability, functional constraint or cost control, and do not have universality.
In the related art, some power data lines with protection devices appear, the power data lines cannot sensitively sense the temperature change of the electronic equipment, effective power failure or warning measures cannot be given in time, and the problem that the charging interface is overheated still exists if a user replaces related adapters and wires for charging.
According to the invention, the thermosensitive element 7 is arranged beside the charging interface, and the protection circuit 8 is utilized to realize the charging protection in the charging process of the electronic equipment, so that the irreversible damage of the electronic equipment and the power data line 2 caused by overheating at the charging interface is effectively prevented, and the safety in the charging process is improved.
According to the charging interface protection device provided by the invention, the thermosensitive element 7 is arranged on the circuit board 6 of the electronic equipment and is close to the charging socket 4, when the thermosensitive element 7 reaches a high-temperature trigger threshold value, the trigger protection circuit 8 is triggered to work, the output loop of the power adapter 1 is short-circuited, the safety of the charging process is improved, the charging efficiency is ensured, and the service life of the electronic equipment can be effectively prolonged.
In some embodiments, the protection circuit 8 is further configured to disconnect the short circuit of the power adapter 1 through the charging socket 4 in case of receiving the second voltage signal input by the heat sensitive element 7.
In the charging process of the electronic equipment, when the matching position of the data line interface 3 and the charging socket 4 reaches the high-temperature trigger threshold of the thermosensitive element 7, the trigger protection circuit 8 works to short-circuit the output loop of the power adapter 1, and the power adapter 1 enters an open circuit state.
Under the open circuit state of the power adapter 1, along with the reduction of the temperature at the matching part of the data line interface 3 and the charging socket 4, the resistance value of the thermosensitive element 7 changes, a second voltage signal is output to the protection circuit 8, the protection circuit 8 controls the circuit state to change, the short circuit state of the output loop of the power adapter 1 is disconnected, and the power adapter 1 recovers the charging output.
When the temperature-sensitive element 7 reaches the low-temperature trigger threshold, a second voltage signal is output, the trigger protection circuit 8 works, the short-circuit state of the output loop of the power adapter 1 is disconnected, the charging process is recovered, the electronic equipment can be automatically recovered to be charged within the safe charging temperature range, manual operation is not needed, and the safety of the charging process is improved.
In some embodiments, when the protection circuit 8 receives the first voltage signal input by the heat sensitive element 7, it may output a warning feedback signal to alert the user that the charging portion of the electronic device is faulty.
In the embodiment, when the temperature-sensitive element 7 reaches the high-temperature trigger threshold, the first voltage signal is output, the trigger protection circuit 8 works, and the alarm feedback signal is output to a processor inside the electronic device.
And the processor of the electronic equipment outputs warning or prompting signals such as characters, sound, light and the like according to the warning feedback signal, and prompts a user that the charging part of the electronic equipment has a fault.
For example, when the heat-sensitive element 7 reaches a high-temperature trigger threshold, the trigger protection circuit 8 works to output an alarm feedback signal to a processor of the electronic equipment.
The treater is according to warning feedback signal, and output warning feedback pronunciation "the interface that charges generates heat, unable normal charge", and suggestion user electronic equipment part that charges has the trouble, and the user can be to the interface that charges clearance back, and 3 departments of data line interface cooperate again, make power adapter 1 for electronic equipment power supply.
In some embodiments, as shown in fig. 2, the protection circuit 8 includes: comparator, reference component group and voltage dividing component group.
Comparing two or more data items or signals to determine whether they are equal or to determine the magnitude relationship and the order of arrangement between them is called comparing.
The comparator is a circuit device that implements a comparison function, compares voltage signals, and outputs a high level or a low level, and when a difference between the input voltage signals increases or decreases and the sign of the input voltage signal does not change, the output level signal remains constant.
In this embodiment, the comparator includes a first input, a second input, and an output.
The reference element group is connected between a device power supply of the electronic device and a first input terminal of the comparator, and the reference element group is used for inputting a reference voltage signal to the comparator.
The reference element group may include a plurality of resistance elements, the plurality of resistance elements in the reference element group share the voltage of the device power supply, and the reference element group inputs the voltage of the device power supply shared as a reference voltage signal to the comparator through the first input terminal as a reference value for comparison by the comparator.
The voltage dividing element group is connected between the thermosensitive element 7 and the second input end of the comparator, and the voltage dividing element group and the thermosensitive element 7 form a voltage dividing circuit.
The thermosensitive element 7 is connected with an equipment power supply, the voltage dividing element group is connected with the thermosensitive element 7 in series, the voltage dividing element group and the thermosensitive element 7 share the voltage of the equipment power supply, and the voltage dividing element group and the thermosensitive element 7 share the voltage of the equipment power supply as a temperature control voltage signal which is input to the comparator through the second input end so as to be compared with the reference voltage signal by the comparator.
It is understood that the resistance value of the thermistor 7 can be changed along with the temperature change at the position of the charging socket 4, and the temperature control voltage signal output by the voltage dividing element group and the thermistor 7 to the second input end of the comparator is changed along with the temperature change at the position of the charging socket 4.
In some embodiments, the set of reference elements comprises: a first reference element and a second reference element.
The first reference element is connected to a device power supply of the electronic device, and the second reference element is connected in parallel to the first reference element.
The first reference element and the second reference element share the voltage of the device power supply, and the voltage of the device power supply shared by the first reference element and the second reference element is output to the comparator as a reference voltage signal.
In practical implementation, the first reference element and the second reference element with different resistance values can be set according to the type of the electronic equipment and the type of the power supply of the equipment, so as to provide reference voltage signals for the comparator.
In some embodiments, the protection circuit 8 further comprises an electronic switch.
The electronic switch is connected between the output end of the comparator and the charging socket 4, and the comparator is used for outputting a target control signal to the electronic switch and controlling the on-off state of the electronic switch.
The comparator compares the received temperature control voltage signal with the reference voltage signal and outputs different target control signals to the electronic switch, and the electronic switch realizes the closing and opening actions according to the different target control signals.
One end of the electronic switch is connected with the output end of the comparator, the other end of the electronic switch is connected with the charging socket 4, and the comparison result of the temperature control voltage signal and the reference voltage signal in the comparator influences the switching state of the electronic switch.
When the electronic switch realizes the closing action according to the target control signal, the output loop from the power adapter 1 to the charging socket 4 is short-circuited, and the power adapter 1 enters an open circuit state.
When the electronic switch realizes the disconnection action according to different target control signals, the short-circuit state of the output loop of the power adapter 1 is disconnected, and the charging process of the electronic equipment is recovered.
In practical implementation, the electronic switch may be a transistor, a field effect transistor, a thyristor, a relay, or other electronic switches.
In this embodiment, the electronic switch may be an N-channel fet.
The MOSFET can be divided into N-channel type and P-channel type, and the N-channel type MOSFET is N-channel MOSFET
For an N-channel FET, the source and drain are connected to an N-type semiconductor, and the current passing through the N-channel FET is controlled by an input voltage.
In some embodiments, the comparator is configured to output a first control signal to the electronic switch to control the electronic switch to close and short the power adapter 1 when the received temperature controlled voltage signal is greater than the reference voltage signal.
In this embodiment, when the temperature sensing element 7 reaches the high temperature triggering threshold, the temperature sensing element 7 and the voltage dividing element group share the voltage of the equipment power supply, which is greater than the voltage of the equipment power supply divided by the reference element group, and the corresponding temperature control voltage signal is greater than the reference voltage signal.
The temperature control voltage signal received by the second input end of the comparator is larger than the reference voltage signal received by the first input end, and the output end of the comparator outputs a first control signal to the electronic switch.
In practical implementation, when the temperature-controlled voltage signal received by the comparator is greater than the reference voltage signal, a high level may be output.
The output end of the comparator outputs a first control signal to the electronic switch, and the electronic switch realizes closing action according to the first control signal, so that the output loop from the power adapter 1 to the charging socket 4 is short-circuited, and the power adapter 1 enters an open circuit state.
That is, the heat sensitive element 7 is connected to the device power supply of the electronic device, and the first voltage signal is input to the protection circuit 8, so that the circuit state in the protection circuit 8 changes, and the output loop from the power adapter 1 to the charging socket 4 is short-circuited.
In some embodiments, the comparator may be further configured to output a second control signal to the electronic switch to control the electronic switch to open and disconnect the short circuit of the power adapter 1 when the received temperature-controlled voltage signal is smaller than the reference voltage signal.
In the off state of the power adapter 1, the temperature of the thermal element 7 reaches the low-temperature trigger threshold as the temperature of the portion where the data line interface 3 is matched with the charging socket 4 decreases.
The voltage of the equipment power supply divided by the thermosensitive element 7 and the voltage dividing element group is smaller than that of the equipment power supply divided by the reference element group, and the corresponding temperature control voltage signal is smaller than the reference voltage signal.
In practical implementation, when the temperature-controlled voltage signal received by the comparator is smaller than the reference voltage signal, a low level can be output.
And the output end of the comparator outputs a second control signal to the electronic switch, and the electronic switch realizes disconnection according to the second control signal, so that an output loop short-circuited from the power adapter 1 to the charging socket 4 is disconnected, and the charging process is recovered.
That is, when the temperature-sensitive element 7 reaches the low-temperature trigger threshold, the second voltage signal is input to the protection circuit 8, so that the circuit state in the protection circuit 8 changes, the short-circuit state of the output loop of the power adapter 1 is disconnected, and the charging process is resumed.
It will be appreciated that in an electronic device, the ground may be negative, the same being true between ground and ground in the circuit board 6.
In some embodiments, the voltage dividing element group comprises: a first voltage dividing element, a second voltage dividing element and a diode.
The first voltage dividing element and the second voltage dividing element are resistance elements, the first voltage dividing element is connected with the thermosensitive element 7 in parallel, the second voltage dividing element is connected with the thermosensitive element 7 in parallel, and the second voltage dividing element is connected with the first voltage dividing element in parallel.
The first voltage division element, the second voltage division element and the thermosensitive element 7 share the voltage of the equipment power supply, and output corresponding temperature control voltage signals to the comparator.
The diode is an electronic device made of semiconductor materials such as silicon, selenium or germanium, and the diode has one-way conductivity, and is conducted when forward voltage is applied to the diode; when a reverse voltage is applied to the diode, the diode is turned off.
In this embodiment, the turning on and off of the diode corresponds to the turning on and off of the switch.
The anode of the diode is connected with a second voltage division element which is connected with the thermistor 7 in parallel, the thermistor is connected with a device power supply, and the cathode of the diode is connected with the output end of the comparator.
The unidirectional conductivity of the diode directly influences whether the second voltage-dividing element connected to the diode participates in the voltage division of the voltage-dividing element group.
In this embodiment, the reasonable value ranges and correlations of the resistors in the reference component group and the voltage dividing component group can be determined according to the unidirectional conductivity of the diode and the high level or the low level output by the comparator, and the required high-temperature and low-temperature trigger threshold value is set by adjusting the value of the resistor, so as to meet the charging protection requirements of various types of electronic equipment which need plug wire charging or power supply in different application scenarios.
A specific embodiment is described below.
As shown in fig. 2, the ntc thermistor is R1, the protection circuit 8 includes a U1 comparator, a Q1N-channel fet and a D1 diode, and all other elements are common resistive elements.
The first voltage dividing element is R3, the second voltage dividing element is R2, the first reference element is R6, and the second reference element is R8.
The resistors R4, R5, R7 and R9 are protection element groups in the protection circuit 8.
The voltage of the power supply of the electronic equipment is VCCThe voltage of the charging power supply connected through the charging interface is VBUS。
The voltage-dividing element group and the thermosensitive element 7 output to the comparator a temperature-controlled voltage signal VDThe reference voltage signal outputted from the reference element group to the comparator is VR。
In practical implementation, R1, R2 and R3 share the voltage VCCAs a detection signal input V of U1DR6 and R8 divide the system voltage VCCAs reference signal input V of U1RWhen V isD<VRWhen V is lower, U1 outputs low levelD>VRWhen U1 outputs high, the level output by U1 directly determines whether Q1 of the following stage is turned on.
U1 outputs high level, Q1 is conducted, so that the power adapter 1 is short-circuited; the U1 output is low and Q1 is on, so that the short circuit of the power adapter 1 is open.
It can be understood that VD＝VRWhen this occurs, U1 holds the level of the current output.
For example, VD＞VRU1 goes high when changing to VD＝VRThe high level of the current output is maintained.
As another example, VD＜VRU1 outputs a low level, when changing to VD＝VRThe current output is held low.
R1 is a ntc thermistor whose resistance value decreases with increasing temperature.
In actual implementation, the resistance value of R1 is determined by the following equation:
RT1＝RT0·eB*((1/T1)-(1/T0))
wherein T0 and T1 are temperatures at different times, and the unit is Kelvin; rT1And RT0The resistance value at the corresponding temperature is given in ohms.
e is a natural constant and B is the thermal index of the ntc thermistor, typically between 2500 and 5000, depending on the device type, in kelvin.
There is D1 in the U1 output feedback branch, whose one-way conductivity determines whether R2 participates in voltage division.
In actual implementation, whether R2 participates in partial pressure or not has the following two conditions:
(1) the case where U1 outputs high level is set.
D1 is not conducted, R2 does not participate in voltage division, VDAnd VRThe following formula is satisfied:
VD＝VCC·R3/(R1+R3)
VR＝VCC·R8/(R6+R8)
VD＞VR
(2) the case where U1 outputs a low level is set.
D1 is turned on, R2 participates in voltage division, VDAnd VRThe following formula is satisfied:
VD＝VCC·RL/(R1+RL)
RL＝R2·R3/(R2+R3)
VR＝VCC·R8/(R6+R8)
VD＜VR
in actual implementation, by solving each inequality in the two cases (1) and (2), whether the calculation result of the resistance value is matched with the set output condition of U1 is judged, and the value range and the correlation of each resistance can be solved.
The invention also provides electronic equipment.
The electronic device comprises a device body 5 and a charging interface protection device of the electronic device as described above.
In the embodiment of the present invention, the electronic device may be a mobile phone, a tablet computer, a notebook computer, a wearable device, a recording pen, a translator, an electronic book reader, a wireless headset, an intelligent robot, or other electronic devices.
According to the electronic equipment provided by the invention, the thermosensitive element 7 is arranged on the circuit board 6 of the electronic equipment and is close to the charging socket 4, when the thermosensitive element 7 reaches a high-temperature trigger threshold value, the trigger protection circuit 8 works to short-circuit the output loop of the power adapter 1, so that the safety and the charging efficiency of the charging process are improved, and the service life of the electronic equipment can be effectively prolonged.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art can clearly understand that the embodiments can be implemented by means of a hardware platform.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (11)
1. A charging interface protection device of an electronic device, comprising:
a circuit board;
the charging socket is arranged on the circuit board and is used for being electrically connected with a power adapter;
a thermal element disposed in the circuit board proximate to the charging socket;
the input end of the protection circuit is connected with the thermosensitive element, the output end of the protection circuit is connected with the charging socket, and the protection circuit is used for short-circuiting the power adapter through the charging socket under the condition of receiving a first voltage signal input by the thermosensitive element.
2. The charging interface protection device of the electronic device as claimed in claim 1, wherein the protection circuit is further configured to disconnect the short circuit of the power adapter through the charging socket when receiving the second voltage signal input by the heat sensitive element.
3. The charging interface protection device of an electronic device according to claim 1, wherein the protection circuit comprises:
a comparator;
a reference element group connected between an apparatus power supply of an electronic apparatus and a first input terminal of the comparator, the reference element group being configured to input a reference voltage signal to the comparator;
and the voltage dividing element group is connected between the thermosensitive element and the second input end of the comparator, the thermosensitive element is connected with the equipment power supply, and the voltage dividing element group and the thermosensitive element are used for inputting temperature control voltage signals to the comparator together.
4. The charging interface protection device of an electronic device according to claim 3, wherein the protection circuit further comprises:
the electronic switch is connected between the output end of the comparator and the charging socket, and the comparator is used for outputting a target control signal to the electronic switch to control the on-off state of the electronic switch.
5. The charging interface protection device of an electronic device as claimed in claim 4, wherein the electronic switch is an N-channel FET.
6. The charging interface protection device of the electronic device according to claim 4, wherein the comparator is configured to output a first control signal to the electronic switch to control the electronic switch to close and short-circuit the power adapter when the received temperature-controlled voltage signal is greater than the reference voltage signal.
7. The charging interface protection device of the electronic device according to claim 4, wherein the comparator is configured to output a second control signal to the electronic switch to control the electronic switch to open and disconnect the short-circuit loop of the power adapter when the received temperature-controlled voltage signal is smaller than the reference voltage signal.
8. The charging interface protection device of an electronic device according to claim 3, wherein the voltage dividing element group comprises:
a first voltage dividing element in series with the thermal element;
a second voltage dividing element connected in series with the thermosensitive element and connected in parallel with the first voltage dividing element;
and the anode of the diode is connected with the second voltage-dividing element, and the cathode of the diode is connected with the output end of the comparator.
9. The charging interface protection device for an electronic device according to claim 3, wherein the reference component group comprises:
a first reference element;
a second reference element in parallel with the first reference element.
10. The charging interface protection device of an electronic device as claimed in any one of claims 1 to 9, wherein the protection circuit is further configured to output a warning feedback signal in case of receiving the first voltage signal input by the heat-sensitive element.
11. An electronic device, comprising:
an apparatus main body;
a charging interface protection device for an electronic device as claimed in any of claims 1-10, which is provided on the device body.
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