CN106100027A - Charger and the short-circuit protection circuit for charging inlet - Google Patents
Charger and the short-circuit protection circuit for charging inlet Download PDFInfo
- Publication number
- CN106100027A CN106100027A CN201610485580.7A CN201610485580A CN106100027A CN 106100027 A CN106100027 A CN 106100027A CN 201610485580 A CN201610485580 A CN 201610485580A CN 106100027 A CN106100027 A CN 106100027A
- Authority
- CN
- China
- Prior art keywords
- circuit
- charging inlet
- divider resistance
- critesistor
- temperature range
- 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
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Classifications
-
- 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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
Abstract
The present invention provides a kind of charger and the short-circuit protection circuit for charging inlet, and this short-circuit protection circuit includes: critesistor, and the first end of critesistor is connected with the electrode input end of charging inlet；Divider resistance, the first end of divider resistance is connected with the second end of critesistor, the second end ground connection of divider resistance；Switch triode, the drain electrode of switch triode is connected with the electrode input end of charging inlet, source ground, base stage are connected with the first end of divider resistance；Wherein, the resistance value of critesistor and divider resistance is set to can to make voltage produced by the first end of divider resistance to make under the first temperature range to disconnect between source electrode and drain electrode, voltage produced by the first end of divider resistance can be made can to make between source electrode and drain electrode keep connecting under the second temperature range.By above technical scheme, the present invention can effectively solve the technical problem that charging inlet produces high temperature because of " micro-short circuit " and is burned out.
Description
Technical field
The present invention relates to electronic technology field, particularly relate to a kind of charger and the short-circuit protection for charging inlet
Circuit.
Background technology
Along with the rise of smart mobile phone rapid nitriding, the charging current of mobile phone becomes increasing, from before
500mA 2A by now, fills the release of 3.0 technology soon along with high pass, and continuation is also increased by charging current.The increase of charging current
Using to client while bringing convenience, the security incident such as data line ports heating burnout also becomes increasingly to highlight.
Cause the possible cause of data line ports heating burnout:
1) connecting terminal causes contact resistance to rise with even machine plug repeatedly；
2) foreign material such as hair, metal fillings, the tea stain not parched, coffee stain, sweat stain enter the narrow of charging port adapter
In little sky, Vbus and GND at charging terminal is caused to form micro-short circuit (especially for Tape C interface, between VBUS and GND
Spacing is less, it is easier to cause micro-short circuit)；
When there is micro-short circuit at charging terminal, such as 2～5 ohm, at this moment voltage is that the charging adapter of 5V still can
Enough electric currents of output 2.5～1A, and this electric current is not enough to cause the attention of charging adapter so that charging adapter is still thought
It is at normal output power.So, this " resistance " of 2～5 ohm just bears the huge power consumption of about 12.5～5 watts.
Within connecting this such narrow space of terminal, this heat is sufficient so that environment temperature and rises above 200 degree so that fill
Electric terminal is burned out.
And the short-circuit protection circuit that charging adapter is internally integrated at present, can only cut off when being short-circuited the big electric current of generation
Electrical connection with charging inlet, it is impossible to stop above-mentioned by problem produced by smaller current.
In sum, it is necessary to provide a kind of charger and the short-circuit protection circuit for charging inlet, on to solve
State problem.
Summary of the invention
The technical problem that present invention mainly solves is to provide a kind of charger and the short-circuit protection electricity for charging inlet
Road, can effectively solve the technical problem that charging inlet is burned out because " micro-short circuit " produces high temperature.
For solving above-mentioned technical problem, the present invention provides a kind of short-circuit protection circuit for charging inlet, adaptive charging
The cathode output end of device is connected with the electrode input end of charging inlet, and the cathode output end of charging adapter is to charging inlet just
Pole input output charging voltage, this circuit includes: critesistor, is arranged in charging inlet, for detecting charging inlet
Temperature, and the first end of critesistor is connected with the electrode input end of charging inlet；Divider resistance, the first end of divider resistance with
Second end of critesistor connects, the second end ground connection of divider resistance；Switch triode, the drain electrode of switch triode and charging
The electrode input end connection of mouth, source ground, base stage are connected with the first end of divider resistance；Wherein, critesistor and dividing potential drop electricity
The resistance value of resistance is set to can to make voltage produced by the first end of divider resistance to make source electrode and leakage under the first temperature range
Disconnect between pole, voltage produced by the first end of divider resistance can be made under the second temperature range can to make source electrode and leakage
Keeping between pole connecting, wherein the temperature value of the second temperature range is higher than the temperature value of the first temperature range.
Wherein, charging adapter is provided with current foldback circuit, when keeping connecting between source electrode and drain electrode, and adaptive charging
The cathode output end ground connection of device generation exceed the electric current of predetermined threshold, and short-circuit protection circuit cuts off charging when electric current being detected
Connection between cathode output end and the electrode input end of charging inlet of adapter.
Wherein, switch triode is NMOS tube.
Wherein, charging inlet is USB interface.
Wherein, USB interface is Type C interface.
Wherein, critesistor, divider resistance, switch triode are arranged in the circuit board within Type C interface.
Wherein, the electrode input end of charging inlet is the Vbus terminal of USB interface.
Wherein, the temperature range of the first temperature range is 0 to 100 degree Celsius, and the temperature range of the second temperature range is big
In 100 degrees Celsius.
The present invention further provides a kind of charger, including above-mentioned short-circuit protection circuit.
The invention has the beneficial effects as follows: be different from the situation of prior art, the short-circuit protection circuit of the present invention can pass through
The temperature of critesistor detection charging inlet, when charging inlet generates heat due to " micro-short circuit " and produces the second temperature range,
The resistance change of critesistor is to control switch triode Guan Bi, thus makes the cathode output end ground connection of charging adapter, can
Charging adapter can be known, and charging inlet is in " micro-short circuit " state, thus makes reply, and therefore, the present invention is permissible
Effectively solve the technical problem that charging inlet is burned out because " micro-short circuit " produces high temperature.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram for charging inlet short-circuit protection circuit of son according to embodiments of the present invention.
Detailed description of the invention
The present invention is described in detail with embodiment below in conjunction with the accompanying drawings.
Refer to the circuit structure for charging inlet short-circuit protection circuit that Fig. 1, Fig. 1 are sons according to embodiments of the present invention
Schematic diagram, as it is shown in figure 1, charging adapter 30 electrically connects with charging inlet 10, specifically, the positive pole output of charging adapter 30
End is connected with the electrode input end of charging inlet 10, and the cathode output end of charging adapter 30 inputs with the negative pole of charging inlet 10
End connects, and specifically, charging adapter 30 can realize electrically connecting with charging inlet 10 by charging circuit.Charging adapter 30
Cathode output end export charging voltage and charging current to the electrode input end of charging inlet 10.
Continuing with seeing Fig. 1, short-circuit protection circuit 20 circuit of the present invention specifically includes critesistor 201, divider resistance
202 and switch triode 203.
As it is shown in figure 1, critesistor 201, it is arranged in charging inlet 10, for detecting the temperature of charging inlet 10, heat
Quick resistance 201 is connected in series with divider resistance 202, specifically: the first end of critesistor 201 is defeated with the positive pole of charging inlet 10
Entering end to connect, the first end of divider resistance 202 is connected with the second end of critesistor 201, the second termination of divider resistance 202
Ground.
The drain electrode of switch triode 203 is connected with the electrode input end of charging inlet 10, and the source electrode of switch triode 203 connects
Ground, the base stage of switch triode 203 is connected with the first end of divider resistance 202.
Wherein, the resistance value of critesistor 201 and divider resistance 202 is set to can make dividing potential drop under the first temperature range
Voltage produced by first end of resistance 202 makes and disconnecting between source electrode and drain electrode, can make score under the second temperature range
Voltage produced by first end of piezoresistance 202 can make and keep between source electrode and drain electrode connecting., the wherein temperature of the second temperature range
Angle value is higher than the temperature value of described first temperature range.
Critesistor 201 can be semistor 201 or negative tempperature coefficient thermistor 201.Positive temperature system
Number critesistor 201 resistance values when temperature is the highest are the biggest, and resistance value is more when temperature is the highest for negative tempperature coefficient thermistor 201
Little.
For example, the charged electrical that the cathode output end of charging adapter 30 exports to the electrode input end of charging inlet 10
Pressure is for 5V, and critesistor 201 be negative tempperature coefficient thermistor 201, and the base stage of switch triode 203 is more than receiving or
Equal to source electrode during 4V voltage and holding connection between drain electrode, the base stage of switch triode 203 is source when receiving less than 4V voltage
Disconnect between pole and drain electrode.
For convenience of description, now attempt an extreme example and illustrate, i.e. at the first temperature range intermittent fever of 0 to 100 DEG C
The resistance of quick resistance 201 is 1K Ω, and under more than second temperature range of 100 DEG C, the resistance of critesistor 201 is 1 Ω, dividing potential drop
The resistance of resistance 202 is 1K Ω.
When normally using, not there is " micro-short circuit " in charging inlet 10, therefore temperature is in first temperature of 0 to 100 DEG C
Degree scope, the resistance of critesistor 201 is 1K Ω, and the 5V voltage that at this moment cathode output end of charging adapter 30 produces is by temperature-sensitive
Resistance 201 and divider resistance 202 dividing potential drop and produce the voltage of 2.5V in the base stage of switch triode 203, insufficient for source electrode
And connect between drain electrode, therefore charging inlet 10 normally works under the first temperature range.
When charging inlet 10 occurs " micro-short circuit " and adstante febre, and temperature can raise, so that the resistance of critesistor 201
Changing, the resistance of critesistor 201 is 1 Ω, and the 5V voltage that now cathode output end of charging adapter 30 produces is warm
Quick resistance 201 and divider resistance 202 dividing potential drop and produce the voltage that approximates 5V in the base stage of switch triode 203, it is sufficient to make
Connect between source electrode and drain electrode, thus make the cathode output end ground connection of charging adapter 30.
In embodiments of the present invention, charging adapter 30 is provided with current foldback circuit, keeps between source electrode and drain electrode
During connection, the cathode output end ground connection of charging adapter 30 generation exceed the electric current of predetermined threshold, and short-circuit protection circuit 20 exists
The connection between cathode output end and the electrode input end of charging inlet 10 of charging adapter 30 is cut off when electric current being detected, from
And make charging inlet 10 stop heating.
Alternatively, switch triode 203 can be NMOS tube, and charging inlet 10 can be USB interface, the positive pole of charging inlet 10
Input is the Vbus terminal of USB interface.
Wherein, charging inlet 10 can also be for Type C interface.
In Type C interface, need to increase by one piece of circuit board and carry out reflow soldering identification resistance, therefore, critesistor 201,
Divider resistance 202, switch triode 203 are arranged in the circuit board within Type C interface.
Preferably, the temperature range of the first temperature range is 0 to 100 degree Celsius, and the temperature range of the second temperature range is
More than 100 degrees Celsius.
The present invention protects a kind of charger further, including above-mentioned short-circuit protection circuit 20, charging inlet 10 and
Charging adapter 30.
To sum up, short-circuit protection circuit and the charger of the present invention can be by the temperature of critesistor detection charging inlet
Degree, when charging inlet generates heat due to " micro-short circuit " and produces the second temperature range, the resistance change of critesistor is with control
Switch triode processed closes, thus makes the cathode output end ground connection of charging adapter, charging adapter can be made to know and fill
Electrical interface is in " micro-short circuit " state, thus makes reply, and therefore, the present invention can effectively solve charging inlet because of " micro-short
Road " and the technical problem that produces the second temperature range and be burned out.
The foregoing is only embodiments of the present invention, not thereby limit the scope of the claims of the present invention, every utilization is originally
Equivalent structure or equivalence flow process that description of the invention and accompanying drawing content are made convert, or are directly or indirectly used in what other were correlated with
Technical field, is the most in like manner included in the scope of patent protection of the present invention.
Claims (9)
1. the short-circuit protection circuit for charging inlet, it is characterised in that the cathode output end of charging adapter is with described
The electrode input end of charging inlet connects, and the cathode output end of described charging adapter is to the electrode input end of described charging inlet
Output charging voltage, described circuit includes:
Critesistor, is arranged in described charging inlet, for detecting the temperature of described charging inlet, and described critesistor
First end is connected with the electrode input end of described charging inlet；
Divider resistance, the first end of described divider resistance is connected with the second end of described critesistor, the of described divider resistance
Two end ground connection；
Switch triode, the drain electrode of described switch triode is connected with the electrode input end of described charging inlet, source ground, base
Pole is connected with the first end of described divider resistance；
Wherein, the resistance value of described critesistor and divider resistance is set to make described dividing potential drop electricity under the first temperature range
Voltage produced by first end of resistance makes and disconnecting between described source electrode and described drain electrode, can make under the second temperature range
Voltage produced by first end of described divider resistance can make and keep between described source electrode and described drain electrode connecting, and wherein said the
The temperature value of two temperature ranges is higher than the temperature value of described first temperature range.
Circuit the most according to claim 1, it is characterised in that described charging adapter is provided with current foldback circuit, when
When keeping between described source electrode and described drain electrode connecting, cathode output end ground connection the generation of described charging adapter exceed predetermined
The electric current of threshold value, described short-circuit protection circuit cut off when described electric current being detected the cathode output end of described charging adapter with
Connection between the electrode input end of described charging inlet.
Circuit the most according to claim 1, it is characterised in that described switch triode is NMOS tube.
Circuit the most according to claim 1, it is characterised in that described charging inlet is USB interface.
5. want the circuit described in 4 according to right, it is characterised in that described USB interface is Type C interface.
Circuit the most according to claim 5, it is characterised in that described critesistor, described divider resistance, described switch three
Pole pipe is arranged in the circuit board within described Type C interface.
Circuit the most according to claim 4, it is characterised in that the electrode input end of described charging inlet is USB interface
Vbus terminal.
Circuit the most according to claim 1, it is characterised in that the temperature range of described first temperature range is 0 to 100 to take the photograph
Family name's degree, the temperature range of described second temperature range is more than 100 degrees Celsius.
9. a charger, it is characterised in that include the short-circuit protection circuit described in any one of claim 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610485580.7A CN106100027A (en) | 2016-06-27 | 2016-06-27 | Charger and the short-circuit protection circuit for charging inlet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610485580.7A CN106100027A (en) | 2016-06-27 | 2016-06-27 | Charger and the short-circuit protection circuit for charging inlet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106100027A true CN106100027A (en) | 2016-11-09 |
Family
ID=57213973
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610485580.7A Pending CN106100027A (en) | 2016-06-27 | 2016-06-27 | Charger and the short-circuit protection circuit for charging inlet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106100027A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106786942A (en) * | 2016-12-30 | 2017-05-31 | 深圳天珑无线科技有限公司 | A kind of charge protection device and charging system |
| CN107069843A (en) * | 2017-01-13 | 2017-08-18 | 顺丰科技有限公司 | Short-circuit protection charging inlet and its control method |
| CN107689652A (en) * | 2017-08-17 | 2018-02-13 | 维沃移动通信有限公司 | A kind of charge protection method, circuit, device and mobile terminal |
| CN107706985A (en) * | 2017-10-31 | 2018-02-16 | 北京小米移动软件有限公司 | terminal charging method and device |
| CN108923383A (en) * | 2018-08-28 | 2018-11-30 | 苏州力生美半导体有限公司 | A kind of novel USB Type-C connector overheating protection circuit and its method for excessive heating protection |
| CN110247368A (en) * | 2018-03-09 | 2019-09-17 | 陈晓萍 | Protect circuit |
| CN111614138A (en) * | 2020-05-25 | 2020-09-01 | 维沃移动通信有限公司 | Interface protection circuit and electronic equipment |
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| JP2002281660A (en) * | 2001-03-21 | 2002-09-27 | Matsushita Electric Ind Co Ltd | Protective device of battery pack |
| EP1137145A3 (en) * | 2000-03-17 | 2005-10-05 | Alps Electric Co., Ltd. | Anti-reverse connection circuit for power supply |
| CN101079542A (en) * | 2006-05-24 | 2007-11-28 | 三星Sdi株式会社 | Battery pack |
| CN103001177A (en) * | 2011-09-19 | 2013-03-27 | 海洋王（东莞）照明科技有限公司 | LED lamp and overheat protecting circuit thereof |
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2016
- 2016-06-27 CN CN201610485580.7A patent/CN106100027A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1137145A3 (en) * | 2000-03-17 | 2005-10-05 | Alps Electric Co., Ltd. | Anti-reverse connection circuit for power supply |
| JP2002281660A (en) * | 2001-03-21 | 2002-09-27 | Matsushita Electric Ind Co Ltd | Protective device of battery pack |
| CN101079542A (en) * | 2006-05-24 | 2007-11-28 | 三星Sdi株式会社 | Battery pack |
| CN103001177A (en) * | 2011-09-19 | 2013-03-27 | 海洋王（东莞）照明科技有限公司 | LED lamp and overheat protecting circuit thereof |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106786942A (en) * | 2016-12-30 | 2017-05-31 | 深圳天珑无线科技有限公司 | A kind of charge protection device and charging system |
| CN107069843A (en) * | 2017-01-13 | 2017-08-18 | 顺丰科技有限公司 | Short-circuit protection charging inlet and its control method |
| CN107069843B (en) * | 2017-01-13 | 2023-08-29 | 顺丰科技有限公司 | Short-circuit protection charging interface and control method thereof |
| CN107689652A (en) * | 2017-08-17 | 2018-02-13 | 维沃移动通信有限公司 | A kind of charge protection method, circuit, device and mobile terminal |
| CN107706985A (en) * | 2017-10-31 | 2018-02-16 | 北京小米移动软件有限公司 | terminal charging method and device |
| CN110247368A (en) * | 2018-03-09 | 2019-09-17 | 陈晓萍 | Protect circuit |
| CN108923383A (en) * | 2018-08-28 | 2018-11-30 | 苏州力生美半导体有限公司 | A kind of novel USB Type-C connector overheating protection circuit and its method for excessive heating protection |
| 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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| PB01 | Publication | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20161109 |
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| RJ01 | Rejection of invention patent application after publication |