CN106953381A - Temperature protection circuit, method and the terminal device of charging inlet - Google Patents

Temperature protection circuit, method and the terminal device of charging inlet Download PDF

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Publication number
CN106953381A
CN106953381A CN201710240618.9A CN201710240618A CN106953381A CN 106953381 A CN106953381 A CN 106953381A CN 201710240618 A CN201710240618 A CN 201710240618A CN 106953381 A CN106953381 A CN 106953381A
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CN
China
Prior art keywords
charging inlet
temperature
terminal
unit
output
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201710240618.9A
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Chinese (zh)
Inventor
杨培凯
赵秀刚
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Shanghai Yude Technology Co Ltd
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Shanghai Yude Technology Co Ltd
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Application filed by Shanghai Yude Technology Co Ltd filed Critical Shanghai Yude Technology Co Ltd
Priority to CN201710240618.9A priority Critical patent/CN106953381A/en
Publication of CN106953381A publication Critical patent/CN106953381A/en
Pending legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0031Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H5/00Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
    • H02H5/04Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
    • H02H5/045Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature using a thermal radiation sensor
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0036Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using connection detecting circuits
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries

Abstract

The present invention relates to electronic technology field, a kind of temperature protection circuit of charging inlet, method and terminal device are disclosed.In the present invention, the temperature protection circuit of charging inlet is applied to the charging circuit system of terminal device, and the temperature protection circuit of the charging inlet includes:Charging inlet unit, temperature control partial pressure unit, switch element and power output end;Temperature control partial pressure unit is electrically connected to the enable terminal of switch element, provides voltage to enable terminal, enables the voltage variation with temperature of terminal and change;When the voltage for enabling terminal reaches preset value, switch element disconnects the output end and power output end of charging inlet unit;Otherwise, the output end and power output end of switching means conductive charging inlet unit.The invention also discloses a kind of temperature protecting method of charging inlet and terminal device.Compared with prior art, the present invention can avoid causing the problems such as charging inlet is damaged because temperature is too high, reduce the processor CPU of terminal device burden.

Description

Temperature protection circuit, method and the terminal device of charging inlet
Technical field
The present invention relates to electronic technology field, the more particularly to temperature protection circuit of charging inlet, method and terminal is set It is standby.
Background technology
In recent years, continuing to develop and scientific and technological continuous progress with the communication technology, mobile phone, notebook computer, flat board The mobile terminals such as computer turn into use instrument essential in people's daily life;Because its carrying is convenient, use Life that is simple and giving people brings great convenience.For mobile phone, as shown in figure 1, in existing cell phone charging circuit, 1 pin of USB (USB is Universal Serial Bus abbreviation, and Chinese is interpreted as USB) interface is directly led out Power output end.2 pin USB_DM of USB interface are data negative signal, and 3 pin USB_DP are data positive signal, and 4 pin USB_ID are used for The different cable end points of identification, 5 pin to 9 pin are grounded.Wherein, when 4 pin USB_ID are grounded, A-Device is called, USB is served as Host, and A-Device is always bus offer electric power, when 4 pin USB_ID are hanging, is called B-Device, serves as USB Device, the USB Host/USB Device of mobile phone can be switched by HNP (main frame exchange agreement).
But, inventor is during the present invention is realized, discovery also has following technological deficiency in the prior art:Make With charger by USB interface be mobile phone charge when, easily cause the problems such as USB interface is damaged because mobile phone temp is too high.And And, in the prior art, the temperature for detecting battery is realized by software, and when battery temperature is too high, charging circuit is cut off, but It is to need processor CPU to do real-time monitoring, not only extra increase CPU burden, and software detection has probability mistake The problem of detection, and software detection design cost is higher.
The content of the invention
The purpose of the embodiment of the present invention is to provide a kind of temperature protection circuit of charging inlet, method and terminal to set It is standby so that when the temperature of charging inlet is too high, the output end and power output end of charging inlet unit can be disconnected, it is to avoid because Temperature is too high and causes the problems such as charging inlet is damaged, and realizes said temperature defencive function by the method for pure hardware, can To avoid the probabilistic error of software detection, the processor CPU of terminal device burden can also be reduced, design cost is relatively low.
In order to solve the above technical problems, the embodiments of the invention provide a kind of temperature protection circuit of charging inlet, application In the charging circuit system of terminal device, the temperature protection circuit of the charging inlet includes:Charging inlet unit, temperature control partial pressure list Member, switch element and power output end;Temperature control partial pressure unit is electrically connected to the enable terminal of switch element, is carried to enable terminal Voltage supplied, enables the voltage variation with temperature of terminal and changes;When the voltage for enabling terminal reaches preset value, switch element Disconnect the output end and power output end of charging inlet unit;Otherwise, the output end of switching means conductive charging inlet unit and Power output end.
The embodiment of the present invention additionally provides a kind of temperature protecting method of charging inlet, the charging electricity applied to terminal device Road system, the temperature protection circuit based on above-mentioned charging inlet;When the voltage for enabling terminal reaches preset value, switch element breaks Open the output end and power output end of charging inlet unit;Otherwise, the output end and electricity of switching means conductive charging inlet unit Source output terminal.
The embodiment of the present invention additionally provides a kind of terminal device, including the housing with USB port and above-mentioned charging inlet Temperature protection circuit, the temperature protection circuit of charging inlet is placed in the accommodation space of housing formation, charging inlet unit Positioned at USB port.
The embodiment of the present invention in terms of existing technologies, the enable of switch element is electrically connected to by temperature control partial pressure unit Terminal, provides voltage to enable terminal, enables the voltage variation with temperature of terminal and change;Reached in the voltage for enabling terminal During preset value, switch element disconnects the output end and power output end of charging inlet unit, otherwise, switching means conductive charging The output end and power output end of mouth unit so that when the temperature of charging inlet reaches certain value, enable the voltage energy of terminal Preset value is enough reached, switch element disconnects the output end and power output end of charging inlet unit, so as in charging inlet Temperature it is too high when, disconnect charging inlet unit output end and power output end, it is to avoid cause charging because temperature is too high The problems such as mouth is damaged, and said temperature defencive function is realized by the method for pure hardware, the probability of software detection can be avoided Property error, due to realizing said temperature defencive function without additionally increasing control interface, therefore do not need extra occupied terminal to set Standby processor cpu resource reduces the processor CPU of terminal device burden, and design cost is relatively low.
In addition, temperature control partial pressure unit includes:Fixed value resistance and heat-sensitive sensor device;Fixed value resistance and heat-sensitive sensor device string It is associated between the output end of charging inlet unit and ground;Enable terminal and be connected electrically in the public of fixed value resistance and heat-sensitive sensor device End.Closed by the resistance variation with temperature of the partial pressure relation of fixed value resistance and heat-sensitive sensor device, and heat-sensitive sensor device System, can realize that, in temperature change, the magnitude of voltage of the common port of fixed value resistance and heat-sensitive sensor device changes therewith, that is, enables The voltage of terminal is varied with temperature, so that, in this way there is provided a kind of form that implements of temperature control partial pressure unit, and Design cost is relatively low.
In addition, heat-sensitive sensor device can be thermistor or temperature sensor.
In addition, the temperature voltage relation of heat-sensitive sensor device is negative temperature coefficient relation;Wherein the one of heat-sensitive sensor device End is electrically connected to the output end of charging inlet unit, wherein one end ground connection of fixed value resistance;Wherein, the output of charging inlet unit End is electrically connected to the common terminal of switch element, and power output end is connected to the normally closed terminal of switch element.
In addition, the demand in order to meet actual design, the operating voltage of switch element can be provided by charging inlet unit; Or the temperature protection circuit of charging inlet can also include battery or power management chip, the operating voltage of switch element can be with There is provided by battery or power management chip.
In addition, the temperature protection circuit of charging inlet also includes alarm unit;Switch element is connected electrically in charging inlet list Between the output end and alarm unit of member;When the voltage for enabling terminal reaches preset value, switching means conductive charging inlet list The output end and alarm unit of member;Otherwise, switch element disconnects the output end and alarm unit of charging inlet unit.Pass through conducting The output end and alarm unit of charging inlet unit so that alarm unit work can be triggered, information warning is sent, so that user While temperature protection is realized, it be able to can also be made according to information warning more intuitive understanding to current charged state User pulls out charging equipment according to information warning, it is to avoid have an accident.
In addition, alarm unit can include light emitting diode and/or buzzer.
Brief description of the drawings
One or more embodiments are illustrative by the picture in corresponding accompanying drawing, these exemplary theorys The element with same reference numbers label is expressed as similar element in the bright restriction not constituted to embodiment, accompanying drawing, removes Composition is not limited the non-figure having in special statement, accompanying drawing.
Fig. 1 is the structural representation of USB interface in the prior art;
Fig. 2 is the structured flowchart according to the temperature protection circuit of charging inlet in first embodiment of the invention;
Fig. 3 is the circuit structure diagram according to the temperature protection circuit of charging inlet in second embodiment of the invention;
Fig. 4 is the temperature protecting method flow chart according to charging inlet in third embodiment of the invention.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with each reality of the accompanying drawing to the present invention The mode of applying is explained in detail.However, it will be understood by those skilled in the art that in each embodiment of the invention, In order that reader more fully understands the application and proposes many ins and outs.But, even if without these ins and outs and base Many variations and modification in following embodiment, can also realize the application technical scheme claimed.
The first embodiment of the present invention is related to a kind of temperature protection circuit of charging inlet.As shown in Fig. 2 charging inlet Temperature protection circuit be applied to the charging circuit system of terminal device, the temperature protection circuit of the charging inlet includes:Charging Interface unit 21, temperature control partial pressure unit 22, switch element 23 and power output end 24;Temperature control partial pressure unit 22 is electrically connected to out The enable terminal of unit 23 is closed, voltage is provided to enable terminal, enables the voltage variation with temperature of terminal and change;Enabling When the voltage of terminal reaches preset value, switch element 23 disconnects the output end and power output end 24 of charging inlet unit 21;It is no Then, the output end and power output end 24 of the conducting charging inlet of switch element 23 unit 21.
It is noted that the charging inlet unit 21 of present embodiment can be, but not limited to as USB interface, external charging Device is charged by USB interface access terminal equipment for terminal device.And in actual application, the voltage for enabling terminal can be with Change with the temperature change of USB interface.When the temperature of charging inlet reaches certain value, enabling the voltage of terminal can reach Preset value, switch element 23 disconnects the output end and power output end 24 of charging inlet unit 21.It is thus possible in charging inlet Temperature it is too high when, disconnect the output end and power output end 24 of charging inlet unit 21, it is to avoid cause to fill because temperature is too high The problems such as electrical interface is damaged, and said temperature defencive function is realized by the method for pure hardware, software detection can be avoided Probabilistic error.Due to realizing said temperature defencive function without additionally increasing control interface, therefore it need not additionally take end The processor cpu resource of end equipment reduces the processor CPU of terminal device burden, and design cost is relatively low.
By the above, it is seen that, present embodiment, when the temperature of charging inlet is too high, to disconnect and fill The output end and power output end 24 of electric interface unit 21, it is to avoid cause the problems such as charging inlet is damaged because temperature is too high, and And said temperature defencive function is realized by the method for pure hardware, the probabilistic error of software detection can be avoided, can also be subtracted The processor CPU of small terminal device burden, design cost is relatively low.
Second embodiment of the present invention is related to a kind of temperature protection circuit of charging inlet.Second embodiment is The improvement done on the basis of one embodiment.
The temperature protection circuit of charging inlet is applied to the charging circuit system of terminal device, as shown in figure 3, charging inlet Temperature protection circuit include:Charging inlet unit 21, temperature control partial pressure unit 22, switch element 23 and power output end VBUS_OUT.Wherein, switch element 23 can be, but not limited to as micro-control switch, and 1 pin is normally opened terminal NO, and 2 pin are ground terminal GND, 3 pin are normally closed terminal NC, and 4 pin are common terminal COM, and 5 pin are voltage input-terminal V+, and 6 pin are enable terminal IN.Switch Unit 23 can also be single-pole double-throw switch (SPDT), double-point double-throw switch etc..Temperature control partial pressure unit 22 is electrically connected to switch element 23 Terminal IN is enabled, voltage is provided to enable terminal IN, enables terminal IN voltage variation with temperature and change;Enabling terminal When IN voltage reaches preset value, switch element 23 disconnects the output end and power output end VBUS_ of charging inlet unit 21 OUT;Otherwise, the output end and power output end VBUS_OUT of the conducting charging inlet of switch element 23 unit 21.
It is noted that the charging inlet unit 21 of present embodiment can be, but not limited to as USB interface, external charging Device is charged by USB interface access terminal equipment for terminal device.And in actual application, the voltage for enabling terminal IN can Changed with the temperature change with USB interface.When the temperature of charging inlet reaches certain value, the voltage for enabling terminal IN can Preset value is reached, switch element 23 disconnects the output end and power output end VBUS_OUT of charging inlet unit 21.It is thus possible to When the temperature of charging inlet is too high, the output end and power output end VBUS_OUT of charging inlet unit 21 are disconnected, it is to avoid because Temperature is too high and causes the problems such as charging inlet is damaged, and realizes said temperature defencive function by the method for pure hardware, can To avoid the probabilistic error of software detection.Due to realizing said temperature defencive function without additionally increasing control interface, therefore Do not need extra occupied terminal equipment processor cpu resource reduce terminal device processor CPU burden, design cost compared with It is low.
It is noted that temperature control partial pressure unit 22 includes:Fixed value resistance R1 and heat-sensitive sensor device.Fixed value resistance R1 can With but be not limited to 47 kilohms.Also, in actual application, in order to allow the voltage for enabling terminal IN can be with USB interface Temperature change and change, heat-sensitive sensor device can be placed on to the vicinity of USB interface.Specifically, fixed value resistance R1 and Heat-sensitive sensor device is connected between the output end of charging inlet unit 21 and ground;Enable terminal IN and be connected electrically in fixed value resistance R1 With the common port of heat-sensitive sensor device.The resistance variation with temperature of heat-sensitive sensor device and change, due to fixed value resistance R1 and Heat-sensitive sensor device is connected between the output end of charging inlet unit 21 and ground, thus heat-sensitive sensor device resistance with temperature During degree change, the magnitude of voltage of the common port of fixed value resistance R1 and heat-sensitive sensor device can change, when temperature is too high, fixed value resistance The voltage of the common port of R1 and heat-sensitive sensor device reaches preset value, disconnects output end and the power supply output of charging inlet unit 21 Hold VBUS_OUT.By fixed value resistance R1 and heat-sensitive sensor device partial pressure relation, and heat-sensitive sensor device resistance with temperature The variation relation of degree, can be realized in temperature change, the magnitude of voltage of the common port of fixed value resistance R1 and heat-sensitive sensor device with Change, that is, the voltage for enabling terminal IN varies with temperature so that, in this way there is provided a kind of temperature control partial pressure unit 22 Implement form, and design cost is relatively low.Wherein, heat-sensitive sensor device can be, but not limited to as thermistor or temperature biography Sensor.
In addition, the temperature voltage relation of heat-sensitive sensor device is negative temperature coefficient relation;NTC heat-sensitive sensors device be (NTC's Chinese is interpreted as negative temperature coefficient thermistor) wherein one end be electrically connected to the output end of charging inlet unit 21, definite value Resistance R1 wherein one end ground connection.Wherein, the output end of charging inlet unit 21 is electrically connected to the common terminal of switch element 23 COM, power output end VBUS_OUT are connected to the normally closed terminal NC of switch element 23.It is preferred that, the temperature protection of charging inlet Circuit can also include alarm unit;Switch element 23 be connected electrically in charging inlet unit 21 output end and alarm unit it Between;When the voltage for enabling terminal IN reaches preset value, the output end of the conducting charging inlet of switch element 23 unit 21 and warning Unit;Otherwise, switch element 23 disconnects the output end and alarm unit of charging inlet unit 21.In this way there is provided A kind of concrete form of temperature control partial pressure unit 22, helps to ensure that the feasibility of the present invention.Also, the temperature of heat-sensitive sensor device Voltage relationship is not limited to negative temperature coefficient relation, or positive temperature coefficient relation.In the temperature electricity of heat-sensitive sensor device When pressure relation is positive temperature coefficient relation:Wherein one end ground connection of heat-sensitive sensor device, wherein one end electrical connection of fixed value resistance In the output end of charging inlet unit, wherein, the output end of charging inlet unit is electrically connected to the common terminal of switch element, electricity Source output terminal is connected to the normally closed terminal of switch element.It is noted that being closed in figure with the temperature voltage of heat-sensitive sensor device It is to be illustrated for negative temperature coefficient relation:Specifically, when the temperature on NTC heat-sensitive sensor devices periphery is too high, NTC temperature-sensitives The resistance of senser element diminishes, and the pressure drop of the common port of fixed value resistance R1 and NTC heat-sensitive sensor device is smaller, therefore fixed value resistance R1 Magnitude of voltage with the common port of NTC heat-sensitive sensor devices is high voltage.Now, switch element 23, which is in, enables working condition, altogether Normally opened terminal NO is switched to terminal COM, that is, disconnects the output end and power output end VBUS_OUT of charging inlet unit 21, eventually The charge path of end equipment is cut off.When temperature on NTC heat-sensitive sensor devices periphery is too low, the resistance of NTC heat-sensitive sensor devices Value becomes big, and the pressure drop of the common port of fixed value resistance R1 and NTC heat-sensitive sensor device is larger, therefore fixed value resistance R1 and NTC temperature-sensitive are passed The magnitude of voltage of the common port of inductor component is low-voltage.Now, switch element 23 is in default conditions, and common terminal COM is switched to Normally closed terminal NC, terminal device can be charged normal.It is noted that by reaching preset value in the voltage for enabling terminal IN When, the output end and alarm unit of conducting charging inlet unit 21 so that can trigger alarm unit work send warning letter Breath, so that user can realize the same of temperature protection according to information warning more intuitive understanding to current charged state When, user can also be made to pull out charging equipment according to information warning, it is to avoid have an accident.Wherein, alarm unit can with but It is not limited to include light emitting diode and/or buzzer.When switch element 23 turns on output end and the warning of charging inlet unit 21 During unit, alarm unit work can be triggered.Such as, when alarm unit is light emitting diode, light emitting diode can be triggered Send light or flicker.When alarm unit is buzzer, sound can be sent.In addition, alarm unit can also be motor, touch Send out motor vibration.For seeing LED operation, or hear motor Rack or buzzer sound when, can be with Pull out charging equipment, it is to avoid have an accident.
In addition, the demand in order to meet actual design, the operating voltage of switch element 23 can be by charging inlet unit 21 There is provided;Or the temperature protection circuit of charging inlet can also include battery or power management chip, the work of switch element 23 Voltage can be provided by battery or power management chip.Such as, can be by charging with the operating voltage of switch element 23 in figure Exemplified by mouth unit 21 is provided, specifically, the temperature protection circuit of charging inlet can also include two resistance, be the first electricity respectively Hinder R2 and second resistance R3.Wherein, first resistor R2 and second resistance R3 are connected between the output end of charging inlet and ground, and The output end of first resistor R2 wherein one termination charging inlet, second resistance R3 wherein one end ground connection.Switch element 23 Voltage input end V+ is connected electrically in first resistor R2 and second resistance R3 common port.And it is possible to be opened according in actual design The operating voltage of unit 23 is closed to design first resistor R2 and second resistance R3 resistance.Present embodiment to first resistor R2 and Second resistance R3 resistance is not limited, and first resistor R2 and second resistance R3 can be, but not limited to respectively 20 kilohms With 24 kilohms.
By the above, it is seen that, present embodiment, when the temperature of charging inlet is too high, to disconnect and fill The output end and power output end VBUS_OUT of electric interface unit 21, it is to avoid cause charging inlet damage etc. to be asked because temperature is too high Topic, and said temperature defencive function is realized by the method for pure hardware, the probabilistic error of software detection can be avoided, may be used also With the burden for the processor CPU for reducing terminal device, design cost is relatively low.
Third embodiment of the invention is related to a kind of temperature protecting method of charging inlet, the charging applied to terminal device Circuit system, the temperature protection circuit based on first or the charging inlet of second embodiment.
Idiographic flow, as shown in figure 4, the temperature protecting method of charging inlet includes:
Step 401, judge whether the voltage for enabling terminal reaches preset value.If it is, into step 402;Otherwise, enter Enter step 403.
Step 402, switch element disconnects the output end and power output end of charging inlet unit.
Step 403, the output end and power output end of switching means conductive charging inlet unit.
It is seen that, present embodiment is the embodiment of the method corresponding with first or second embodiment, this embodiment party Formula can work in coordination implementation with first or second embodiment.First or second embodiment in the relevant technical details mentioned exist In present embodiment still effectively, in order to reduce repetition, repeat no more here.Correspondingly, the correlation mentioned in present embodiment Ins and outs are also applicable in first or second embodiment.
Therefore it is seen that, present embodiment make it that, when the temperature of charging inlet is too high, charging inlet unit can be disconnected Output end and power output end VBUS_OUT, it is to avoid cause the problems such as charging inlet is damaged because temperature is too high, and pass through The method of pure hardware realizes said temperature defencive function, can avoid the probabilistic error of software detection, can also reduce terminal The processor CPU of equipment burden, design cost is relatively low.
Four embodiment of the invention is related to a kind of terminal device, including the housing with USB port and the first embodiment party The temperature protection circuit of the charging inlet of formula description, the temperature protection circuit of charging inlet is placed in the accommodation space of housing formation Interior, charging inlet unit is located at USB port.
Because first embodiment is mutually corresponding with present embodiment, therefore present embodiment can be mutual with first embodiment It is engaged implementation.The relevant technical details mentioned in first embodiment are still effective in the present embodiment, implement first The technique effect that can be reached in mode can similarly be realized in the present embodiment, in order to reduce repetition, no longer be gone to live in the household of one's in-laws on getting married here State.Correspondingly, the relevant technical details mentioned in present embodiment are also applicable in first embodiment.
It is seen that, present embodiment make it that, when the temperature of charging inlet is too high, charging inlet unit can be disconnected Output end and power output end VBUS_OUT, it is to avoid cause the problems such as charging inlet is damaged because temperature is too high, and by pure The method of hardware realizes said temperature defencive function, can avoid the probabilistic error of software detection, can also reduce terminal and set Standby processor CPU burden, design cost is relatively low.
Fifth embodiment of the invention is related to a kind of terminal device, including the housing with USB port and the second embodiment party The temperature protection circuit of the charging inlet of formula description, the temperature protection circuit of charging inlet is placed in the accommodation space of housing formation Interior, charging inlet unit is located at USB port;Wherein, alarm unit includes light emitting diode, and housing has opening, light emitting diode Positioned at opening;And/or buzzer, housing is with the sender for being communicated in buzzer.
Because second embodiment is mutually corresponding with present embodiment, therefore present embodiment can be mutual with second embodiment It is engaged implementation.The relevant technical details mentioned in second embodiment are still effective in the present embodiment, implement second The technique effect that can be reached in mode can similarly be realized in the present embodiment, in order to reduce repetition, no longer be gone to live in the household of one's in-laws on getting married here State.Correspondingly, the relevant technical details mentioned in present embodiment are also applicable in second embodiment.
It is seen that, present embodiment make it that, when the temperature of charging inlet is too high, charging inlet unit can be disconnected Output end and power output end VBUS_OUT, it is to avoid cause the problems such as charging inlet is damaged because temperature is too high, and by pure The method of hardware realizes said temperature defencive function, can avoid the probabilistic error of software detection, can also reduce terminal and set Standby processor CPU burden, design cost is relatively low.
It will be appreciated by those skilled in the art that realizing that all or part of step in above-described embodiment method can be by Program instructs the hardware of correlation to complete, and the program storage is in a storage medium, including some instructions are to cause one Individual equipment (can be single-chip microcomputer, chip etc.) or processor (processor) perform the whole of each embodiment method of the application Or part steps.And foregoing storage medium includes:USB flash disk, mobile hard disk, read-only storage (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disc or CD etc. are various can store journey The medium of sequence code.
It will be understood by those skilled in the art that the respective embodiments described above are to realize the specific embodiment of the present invention, And in actual applications, can to it, various changes can be made in the form and details, without departing from the spirit and scope of the present invention.

Claims (10)

1. a kind of temperature protection circuit of charging inlet, it is characterised in that described applied to the charging circuit system of terminal device Temperature protection circuit includes:Charging inlet unit, temperature control partial pressure unit, switch element and power output end;
The temperature control partial pressure unit is electrically connected to the enable terminal of the switch element, provides voltage for the enable terminal, institute State the voltage variation with temperature for enabling terminal and change;
When the voltage of the enable terminal reaches preset value, the switch element disconnects the output end of the charging inlet unit With the power output end;Otherwise, the output end of charging inlet unit described in the switching means conductive and power supply output End.
2. the temperature protection circuit of charging inlet according to claim 1, it is characterised in that the temperature control partial pressure unit bag Include:Fixed value resistance and heat-sensitive sensor device;
The fixed value resistance and the heat-sensitive sensor device are connected between the output end of the charging inlet unit and ground;
It is described to enable the common port that terminal is connected electrically in the fixed value resistance and the heat-sensitive sensor device.
3. the temperature protection circuit of charging inlet according to claim 2, it is characterised in that the heat-sensitive sensor device is Thermistor or temperature sensor.
4. the temperature protection circuit of the charging inlet according to Claims 2 or 3, it is characterised in that the heat-sensitive sensor The temperature voltage relation of part is negative temperature coefficient relation;
Wherein one end of the heat-sensitive sensor device is electrically connected to the output end of the charging inlet unit, the fixed value resistance Wherein one end is grounded;
Wherein, the output end of the charging inlet unit is electrically connected to the common terminal of the switch element, the power supply output End is connected to the normally closed terminal of the switch element.
5. the temperature protection circuit of charging inlet according to claim 1, it is characterised in that the work of the switch element Voltage is provided by the charging inlet unit;Or the temperature protection circuit of the charging inlet also includes battery or power management Chip, the operating voltage of the switch element is provided by the battery or the power management chip.
6. the temperature protection circuit of charging inlet according to claim 1, it is characterised in that the temperature of the charging inlet Protection circuit also includes alarm unit;
The switch element is connected electrically between the output end of the charging inlet unit and the alarm unit;
When the voltage of the enable terminal reaches preset value, the output end of charging inlet unit described in the switching means conductive With the alarm unit;Otherwise, the switch element disconnects the output end and the alarm unit of the charging inlet unit.
7. the temperature protection circuit of charging inlet according to claim 6, it is characterised in that the alarm unit includes hair Optical diode and/or buzzer.
8. a kind of temperature protecting method of charging inlet, it is characterised in that applied to the charging circuit system of terminal device, be based on The temperature protection circuit of charging inlet described in any one in claim 1 to 7;
When the voltage of the enable terminal reaches preset value, the switch element disconnects the output end of the charging inlet unit With the power output end;Otherwise, the output end of charging inlet unit described in the switching means conductive and power supply output End.
9. a kind of terminal device, it is characterised in that including any one institute in housing and claim 1 to 5 with USB port The temperature protection circuit of charging inlet is stated, the temperature protection circuit of the charging inlet is placed in the accommodating sky of the housing formation In, the charging inlet unit is located at the USB port.
10. a kind of terminal device, it is characterised in that including charging inlet described in housing and claim 6 with USB port Temperature protection circuit, the temperature protection circuit of the charging inlet is placed in the accommodation space of the housing formation, described to fill Electric interface unit is located at the USB port;
Wherein, the alarm unit includes light emitting diode, and the housing has opening, and the light emitting diode is located at described open Mouthful;
And/or buzzer, the housing is with the sender for being communicated in the buzzer.
CN201710240618.9A 2017-04-13 2017-04-13 Temperature protection circuit, method and the terminal device of charging inlet Pending CN106953381A (en)

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Application publication date: 20170714