CN206542201U - Short-circuit protection charging inlet - Google Patents
Short-circuit protection charging inlet Download PDFInfo
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- CN206542201U CN206542201U CN201720037955.3U CN201720037955U CN206542201U CN 206542201 U CN206542201 U CN 206542201U CN 201720037955 U CN201720037955 U CN 201720037955U CN 206542201 U CN206542201 U CN 206542201U
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- charging inlet
- resistance
- temperature sensing
- control unit
- charging
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Abstract
This application discloses a kind of short-circuit protection charging inlet.The charging inlet includes：Detect the temperature sensing circuit of the temperature of charging inlet；It is switched on or switched off the power switch circuit that charging inlet is connected with power supply；According to the testing result of temperature sensing circuit, the control unit being switched on or switched off of power switch circuit is controlled；Control unit is connected with temperature sensing circuit, temperature sensing circuit respectively.The technical scheme provided according to the embodiment of the present application, by the charging inlet with temperature sensing circuit, power switch circuit and control unit, can solve the problem that device damage problem caused by charging inlet positive pole and ground short circuit charging.
Description
Technical field
The disclosure relates generally to charging field, more particularly to short-circuit protection charging inlet.
Background technology
At present, the interface in charging field tends to miniaturization, brings the facility for carrying and installing, and minimizes and cause positive pole
Hypotelorism between ground, the problem of bringing the short circuit for easily triggering positive source and ground.
For example, Micro USB female seat openings are small, foreign object is easily stuck in the inside after entering.Spacing between power supply and ground is small
In 1mm so that the impurity such as metal fillings easilys lead to the power supply short circuit of female seat to ground.Now, outside micro USB male joints are inserted
Enter charging, such as clear up the short-circuit impurity not in time, the short circuit of charger will be caused, high current flows through the electricity of MICRO USB sockets
Source and the contact on ground, forming high temperature will cause pad melting, shell burning to melt or be electrically charged the adverse consequences such as device damage.
Utility model content
In view of drawbacks described above of the prior art or deficiency, expect to provide a kind of charging inlet for possessing short-circuit protection, are
Realizing above-mentioned purpose, there is provided a kind of short-circuit protection charging inlet.
A kind of short-circuit protection charging inlet, charging inlet includes：
Detect the temperature sensing circuit of the temperature of charging inlet；
It is switched on or switched off the power switch circuit that charging inlet is connected with power supply；
According to the testing result of temperature sensing circuit, the control unit being switched on or switched off of power switch circuit is controlled；
Control unit is connected with temperature sensing circuit, temperature sensing circuit respectively.
The technical scheme provided according to the embodiment of the present application, by with temperature sensing circuit, power switch circuit and control
The charging inlet of unit processed, can solve the problem that device damage problem caused by charging inlet positive pole and ground short circuit charging.
Brief description of the drawings
By reading the detailed description made to non-limiting example made with reference to the following drawings, the application's is other
Feature, objects and advantages will become more apparent upon：
Fig. 1 shows the exemplary circuit diagram of the short-circuit protection charging inlet according to the embodiment of the present application；
Fig. 2 shows the exemplary circuit diagram of the short-circuit protection charging inlet according to another embodiment of the application；
Fig. 3 shows the exemplary circuit diagram of the short-circuit protection charging inlet according to the another embodiment of the application.
Fig. 4 shows the exemplary process diagram of the control method of the short-circuit protection charging inlet according to the embodiment of the present application.
Embodiment
The application is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining related invention, rather than the restriction to the invention.It also should be noted that, in order to
It is easy to illustrate only the part related to invention in description, accompanying drawing.
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the application can phase
Mutually combination.Describe the application in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
Fig. 1 is refer to, the exemplary circuit diagram of the short-circuit protection charging inlet according to the embodiment of the present application is shown.
As shown in Figure 1 there is provided a kind of short-circuit protection charging inlet, charging inlet includes：
Detect the temperature sensing circuit of the temperature of charging inlet；
It is switched on or switched off the power switch circuit that charging inlet is connected with power supply；
According to the testing result of temperature sensing circuit, the control unit being switched on or switched off of power switch circuit is controlled；
Control unit is connected with temperature sensing circuit, temperature sensing circuit respectively.
Wherein, power switch circuit defaults to conducting.When being electrically charged equipment access charging inlet, equipment is started to charge up,
Then the charge port of equipment begins with temperature change.If because the reasons such as short circuit cause the temperature of charge port to exceed certain value ratio
Such as 80 degree, it is determined that now there is the positive source and ground short circuit of socket, power switch is closed, electric current is limited.Etc. charge port temperature
Degree reopens power switch charging when dropping to desired value (50 degree).Ensure charging, and temperature is no more than dangerous values.
Preferably, temperature sensing circuit include operational amplifier U1, first resistor R1, second resistance R2,3rd resistor R3,
4th resistance R4,3rd resistor R3 first end and the positive pole pin 1 of charging inlet are connected, 3rd resistor R2 the second end and the
Two resistance R2 first end, operational amplifier U1 negative input end connection, second resistance R2 the second end are connected with power supply, the
Four resistance R4 first end and the positive pole pin 1 of charging inlet are connected, the second end and first resistor R1 first end, operation amplifier
The connection connection of ground pin 5 of device U1 positive input terminal, charging inlet, first resistor R1 the second end is connected with power supply, computing
Amplifier U1 output end is connected with control unit U2；Wherein, in first resistor, second resistance, 3rd resistor, the 4th resistance
Any resistance is thermistor.Fig. 1 gives the embodiment that the 4th resistance R4 is thermistor
Wherein, it is resistance variation with temperature the characteristics of thermistor R4 and changes.Positive temperature system is selected in the present embodiment
Several resistance, resistance value increases with the rise of temperature.The temperature coefficient of thermistor is set as K, temperature rise Δ T.Then transport
The pressure difference for putting input is：Δ V=Vbus* (1-1/ (2+K* Δ T)).Wherein, Vbus is charging voltage value.Control unit is led to
Current temperature value can be estimated by crossing acquisition pressure differential deltap V.
Preferably, thermistor is arranged at the Metal Packaging of charging inlet.When positive source and ground short circuit and adstante febre,
The Metal Packaging of charging inlet is best able to reflect its temperature, and thermistor is arranged at the Metal Packaging of charging inlet, is detected
The accuracy rate of temperature will be improved.
In some preferred embodiments, temperature sensing circuit can also use following circuit realiration.
Fig. 2 is refer to, the exemplary circuit diagram of the short-circuit protection charging inlet according to the embodiment of the present application is shown.As schemed
Shown in 2, temperature sensing circuit includes：Operational amplifier U21, thermocouple temperature sensor U23, thermocouple temperature sensor U23
Positive terminal be connected with operational amplifier U21 positive input terminal, thermocouple temperature sensor U23 negative pole end and operation amplifier
Device U21 negative input end connection, operational amplifier U21 output end is connected with control unit U22.
Wherein, the conductor for two kinds of different components that thermocouple temperature sensor passes through itself is bonded into loop, works as abutment
Temperature it is different when, electromotive force is produced in the loop, this phenomenon is referred to as pyroelectric effect, and the electromotive force of generation is referred to as thermoelectrical potential.
It can be seen that, the voltage difference that control unit is gathered by thermocouple temperature sensor being capable of estimated temperature value.
Preferably, thermocouple temperature sensor measurement end is located at the Metal Packaging of charging inlet.To measure accurately
Temperature.
As shown in figure 1, in some preferred embodiments, power switch circuit includes：Field effect transistor switch pipe Q1, field-effect is opened
The source electrode for closing pipe Q1 is connected with power supply, and drain electrode is connected with the ground pin 5 of charging inlet, and grid is connected with control unit.
GPIO_1 is put high potential, FET Q1 conductings, charging inlet output electricity by the power switch circuit default setting
Stream, is easy to whether measurement has temperature change.Control unit U2 can obtain voltage difference by thermistor or thermocouple sensor,
Estimate the temperature value of short circuit thermal, if measured value be more than such as 80 degrees Celsius of high temperature predetermined value, it is possible to determine that J9 or with
The power supply and ground short circuit of its charging socket coordinated, current potential, FET Q1 cut-offs, shut-off power supply are set low by GPIO_1.Charging
Mouth current limited, sharp temperature drop is reduced to temperature and is not more than such as 50 degrees Celsius of low temperature preset value, then control unit U2 will
GPIO_1 puts height so that Q1 is turned on, and starts power supply.As above repeatedly so that the temperature of charging inlet is taken the photograph less than dangerous values such as 80
Family name's degree, the safety entirely charged is ensured.
Preferably, field effect transistor switch pipe Q1 is NMOS field effect transistor switch pipes.FET Q1 herein can use ambipolar
Triode., noise relatively large with respect to the overcurrent of FET for double pole triode is also small.
Preferably, control unit U2 is single-chip microcomputer or comparator.Control unit is given in above-described embodiment for monolithic
The scheme of machine.
Fig. 3 is refer to, the exemplary circuit diagram of the short-circuit protection charging inlet according to the another embodiment of the application is shown.
Fig. 3 shown short-circuit protection charging inlet and Fig. 1 short-circuit protection charging inlet difference be comparator U14, resistance R66 and
Triode Q2 constitutes hysteresis comparator.Specifically, comparator U14 in-phase input end "+" connection resistance R4, resistance R1
With resistance R66, wherein resistance the R4 other end connection positive supply VCC, resistance R1 other end ground connection, the resistance R66 other end
Connecting triode Q2, triode Q2 other end ground connection.Comparator U14 inverting input "-" connection resistance R3 and temperature-sensitive electricity
Hinder R2, wherein resistance the R3 other end connection positive supply VCC, thermistor R2 other end ground connection.Comparator U14 output
Hold connecting triode Q2 base stage and FET Q4 grid.
The present embodiment controls triode Q2 conducting and cut-off, control comparator U14 homophase input by comparator U14
Hold the size of "+" reference voltage.For example when triode Q2 conducting, resistance R66 is in parallel with resistance R1 so that comparator U14
In-phase input end "+" reference voltage diminish (equivalent to 50 degrees Celsius of temperature).When triode Q2 cut-off, resistance R66 is not
It is in parallel with resistance R1 so that comparator U14 inverting input "-" reference voltage becomes big (equivalent to 80 degrees Celsius of temperature).From
And change the reference voltage of comparator saltus step.
Triode Q2 original states are cut-off, and FET Q4 is conducting.Now, comparator U14 in-phase input end
"+" is 80 degrees Celsius of reference voltages.FET Q4 is turned on, and connects power supply, the temperature lifting of charging inlet, with the increasing of temperature
Plus the resistance of thermistor becomes big, greatly to comparator U14 saltus steps during 80 degrees Celsius of reference voltages so that triode Q2 is turned on, field
Effect pipe Q4 is cut-off.Now, comparator U14 in-phase input end "+" is 50 degrees Celsius of reference voltage.FET Q4 is cut
Only, shut-off power supply, sharp temperature drop, the resistance with the reduction thermistor of temperature diminishes, small to 50 degrees Celsius benchmark electricity
Comparator U14 saltus steps again during pressure, triode Q2 cut-offs, FET Q4 is conducting.As above repeatedly so that charging inlet
Temperature is less than such as 80 degrees Celsius of dangerous values, and the safety entirely charged is ensured.Similarly, become when according to the position of thermistor
During change, by changing the position of hysteresis comparator, such scheme can be realized.As shown in Fig. 2 in some preferred embodiments,
Power switch circuit includes：Field effect transistor switch pipe Q4, field effect transistor switch pipe Q4 source electrode is connected with positive source, drain electrode and charging
The positive pole pin connection of interface, grid is connected with control unit.
It is understood that the power switch circuit shown in Fig. 2 can be conjointly employed in the temperature sensing circuit shown in Fig. 1
Charging inlet, similarly, the power switch circuit shown in Fig. 1 can be conjointly employed in charging with the temperature sensing circuit shown in Fig. 2
Mouthful.
Preferably, field effect transistor switch pipe Q4 is PMOS field effect transistor switch pipes.FET Q4 herein can use ambipolar
Triode., noise relatively large with respect to the overcurrent of FET for double pole triode is also small.
Preferably, charging inlet is Micro USB charging inlets, Lighting interfaces or center of circle power interface.
Each circuit that the short-circuit protection of the application is related to may be disposed at various types of charging inlets, such as Micro USB
Interface, the Lighting interfaces of apple or the center of circle power interface for being usually used in 9V chargings.For above-mentioned several interfaces, with
The sunk part of its corresponding charging socket, which is easily accessible debris, causes the short circuit of positive source and ground.During charging, such as not in time
It was found that equipment will be burnt out.In charging inlet, the resistance detecting circuit for short-circuit protection, the power switch circuit of the application are set
After control unit, the generation of charging damage will be prevented.
Fig. 4 shows the exemplary process diagram of the control method of the short-circuit protection charging inlet according to the embodiment of the present application；
As shown in figure 4, in step 301, detecting the temperature value of charging inlet.
In the step, pass through the short circuit for detecting the temperature value of charging inlet, judging whether generation power supply and ground.Need explanation
Be that the conducting state of charging inlet and power supply is default setting, that is, when carrying out above-mentioned detection, electrical interface is to connect with power supply
Connect state.
Then, in step 302, when charging inlet is connected with power supply, judging the temperature value of temperature sensing circuit detection is
It is no to be more than high temperature preset value, if more than high temperature preset value, disconnecting the connection of charging inlet and power supply；
When charging inlet disconnects with power supply, judge whether the temperature value of temperature sensing circuit detection is not more than low temperature and presets
Value, if no more than low temperature preset value, connects the connection of charging inlet and power supply.
By setting high temperature preset value and low temperature preset value, the mode being compared with the temperature value of detection judges whether
Existing high temperature risk.When charging inlet is connected with power supply, if the temperature of detection is more than high temperature preset value, it will stop power supply；Charging
When mouth is connected with power supply, if the temperature of detection is not more than low temperature preset value, it will continue to power.So that occurring the charging inlet of short circuit
It can power, the adverse consequences for the equipment that will not be damaged again.Further, if judging, sound and light alarm can be carried out by occurring short circuit,
To remind user to clear up the debris of socket.
Flow chart and block diagram in accompanying drawing, it is illustrated that according to the system of various embodiments of the invention, method and computer journey
Architectural framework in the cards, function and the operation of sequence product.At this point, each square frame in flow chart or block diagram can generation
The part of one module of table, program segment or code, a part for the module, program segment or code is comprising one or more
Executable instruction for realizing defined logic function.It should also be noted that in some realizations as replacement, institute in square frame
The function of mark can also be with different from the order marked in accompanying drawing generation.For example, two square frames succeedingly represented are actual
On can perform substantially in parallel, they can also be performed in the opposite order sometimes, and this is depending on involved function.Also
It is noted that the combination of each square frame in block diagram and/or flow chart and the square frame in block diagram and/or flow chart, Ke Yiyong
Perform the special hardware based system of defined function or operation to realize, or can be referred to specialized hardware with computer
The combination of order is realized.
Above description is only the preferred embodiment of the application and the explanation to institute's application technology principle.People in the art
Member should be appreciated that invention scope involved in the application, however it is not limited to the technology of the particular combination of above-mentioned technical characteristic
Scheme, while should also cover in the case where not departing from the inventive concept, is carried out by above-mentioned technical characteristic or its equivalent feature
Other technical schemes formed by any combination.Such as features described above has similar with (but not limited to) disclosed herein
The technical characteristic of function carries out technical scheme formed by replacement mutually.
Claims (11)
1. a kind of short-circuit protection charging inlet, it is characterised in that the charging inlet includes：
Detect the temperature sensing circuit of the temperature of the charging inlet；
It is switched on or switched off the power switch circuit that the charging inlet is connected with power supply；
According to the testing result of the temperature sensing circuit, the control list being switched on or switched off of the power switch circuit is controlled
Member；
Described control unit is connected with the temperature sensing circuit, the temperature sensing circuit respectively.
2. charging inlet according to claim 1, it is characterised in that the temperature sensing circuit includes：
Operational amplifier, first resistor, second resistance, 3rd resistor, the 4th resistance, the first end of the 3rd resistor with it is described
The positive pole pin connection of charging inlet, the second end of the second resistance is put with the first end of the second resistance, the computing
The negative input end connection of big device, the second end of the second resistance is connected with the power supply, the first end of the 4th resistance
It is connected with the positive pole pin of the charging inlet, the first end of the second end and the first resistor, the operational amplifier are just
The ground pin connection connection of input, the charging inlet, the second end of first resistor is connected with power supply, the operation amplifier
The output end of device is connected with described control unit；
Wherein, any resistance in the first resistor, the second resistance, the 3rd resistor, the 4th resistance is heat
Quick resistance.
3. charging inlet according to claim 2, it is characterised in that the thermistor is arranged at the charging inlet
At Metal Packaging.
4. charging inlet according to claim 1, it is characterised in that the temperature sensing circuit includes：
Operational amplifier, thermocouple temperature sensor, the positive terminal of the thermocouple temperature sensor and the operational amplifier
Positive input terminal connection, the negative pole end of the thermocouple temperature sensor is connected with the negative input end of the operational amplifier, institute
The output end for stating operational amplifier is connected with described control unit.
5. charging inlet according to claim 4, it is characterised in that the thermocouple temperature sensor measurement end is located at institute
State at the Metal Packaging of charging inlet.
6. according to any described charging inlets of claim 1-5, it is characterised in that the power switch circuit includes：
Field effect transistor switch pipe, the source electrode of the field effect transistor switch pipe is connected with the power supply, drain electrode and the charging inlet
Ground pin connection, grid is connected with described control unit.
7. charging inlet according to claim 6, it is characterised in that the field effect transistor switch pipe is NMOS field effect transistor switches
Pipe.
8. according to any described charging inlets of claim 1-5, it is characterised in that the power switch circuit includes：
Field effect transistor switch pipe, the source electrode of the field effect transistor switch pipe is connected with the positive source, drain electrode and the charging inlet
The connection of positive pole pin, grid is connected with described control unit.
9. charging inlet according to claim 8, it is characterised in that the field effect transistor switch pipe is PMOS field effect transistor switches
Pipe.
10. the charging inlet according to claim any one of 1-5, it is characterised in that the charging inlet is Micro USB
Charging inlet, Lighting interfaces or center of circle power interface.
11. charging inlet according to claim 1, it is characterised in that described control unit is single-chip microcomputer or comparator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720037955.3U CN206542201U (en) | 2017-01-13 | 2017-01-13 | Short-circuit protection charging inlet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720037955.3U CN206542201U (en) | 2017-01-13 | 2017-01-13 | Short-circuit protection charging inlet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206542201U true CN206542201U (en) | 2017-10-03 |
Family
ID=59939006
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720037955.3U Active CN206542201U (en) | 2017-01-13 | 2017-01-13 | Short-circuit protection charging inlet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206542201U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106602513A (en) * | 2017-01-13 | 2017-04-26 | 顺丰科技有限公司 | Short circuit protection charging interface and control method thereof |
| CN111614138A (en) * | 2020-05-25 | 2020-09-01 | 维沃移动通信有限公司 | Interface protection circuit and electronic equipment |
| CN113589202A (en) * | 2020-04-30 | 2021-11-02 | 华为技术有限公司 | Detection circuit and detection device for charging interface |
-
2017
- 2017-01-13 CN CN201720037955.3U patent/CN206542201U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106602513A (en) * | 2017-01-13 | 2017-04-26 | 顺丰科技有限公司 | Short circuit protection charging interface and control method thereof |
| CN113589202A (en) * | 2020-04-30 | 2021-11-02 | 华为技术有限公司 | Detection circuit and detection device for charging interface |
| CN113589202B (en) * | 2020-04-30 | 2023-01-13 | 华为技术有限公司 | Detection circuit and detection device for charging interface |
| CN111614138A (en) * | 2020-05-25 | 2020-09-01 | 维沃移动通信有限公司 | Interface protection circuit and electronic equipment |
| CN111614138B (en) * | 2020-05-25 | 2022-02-25 | 维沃移动通信有限公司 | Interface protection circuit and electronic equipment |
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