CN106877283A - A kind of electronic equipment and its power protecting circuit - Google Patents
A kind of electronic equipment and its power protecting circuit Download PDFInfo
- Publication number
- CN106877283A CN106877283A CN201710294497.6A CN201710294497A CN106877283A CN 106877283 A CN106877283 A CN 106877283A CN 201710294497 A CN201710294497 A CN 201710294497A CN 106877283 A CN106877283 A CN 106877283A
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- Prior art keywords
- circuit
- load
- power supply
- switch
- voltage
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- 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.)
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Classifications
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- 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
- H02H3/20—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 voltage
Abstract
The invention discloses a kind of electronic equipment and its power protecting circuit, the power protecting circuit includes：On-off circuit, couples power supply and load；Wherein, when on-off circuit is turned on, power supply powers to the load；First detection circuit, coupling load and on-off circuit；Wherein, on-off circuit is used for when the voltage of the first detection electric circuit inspection to load meets and imposes a condition, the supply access between deenergization and load.Through the above way, the present invention can be when load voltage be abnormal, and the supply access between timely deenergization and load protects power supply.
Description
Technical field
The present invention relates to power protection field, more particularly to a kind of electronic equipment and its power protecting circuit.
Background technology
Current almost all of electronic equipment, all in the presence of external interface, for the extension of function.Such as common are
USB interface, earphone interface, the HDMI etc. for showing.When external expansion equipment, electronic equipment internal can give outside
Expansion equipment power and make its work.The extension of this interface, man-machine interaction is unfriendly under can effectively solving many situations
Problem.
Although the extension of peripheral interface, the problem of inconvenient operation during solution people's use is can be very good.But
The Interface Expanding of this plug type, there is also misoperation in swapping process, or the expansion equipment of insertion has problem, leads
Cause electronic equipment to export and the situation of short circuit occur to the power supply of expansion equipment, cause electronic equipment to export high current and made so as to burn
Into property loss.When serious can even hidden danger be brought to personal safety.
The content of the invention
One aspect of the present invention is：A kind of power protecting circuit is provided, the power protecting circuit includes：Open
Powered-down road, couples power supply and load；Wherein, when on-off circuit is turned on, power supply powers to the load；First detection circuit, coupling is negative
Carry and on-off circuit；Wherein, on-off circuit is used to, when the voltage of the first detection electric circuit inspection to load meets and imposes a condition, break
Supply access between switch power supply and load.
Another technical solution used in the present invention is：A kind of electronic equipment is provided, the electronic equipment includes being sequentially connected
Power supply, power protecting circuit and power supply interface, power supply interface connection load is with to load supplying；Wherein, the power protection
Circuit includes：On-off circuit, couples power supply and load；Wherein, when on-off circuit is turned on, power supply powers to the load；First detection
Circuit, coupling load and on-off circuit；Wherein, on-off circuit is used to meet in the voltage of the first detection electric circuit inspection to load and sets
During fixed condition, the supply access between deenergization and load.
Brief description of the drawings
Fig. 1 is the structural representation of the embodiment of power protecting circuit one that the present invention is provided；
Fig. 2 is the structural representation of another embodiment of power protecting circuit that the present invention is provided；
Fig. 3 is the electrical block diagram of the power protecting circuit another embodiment that the present invention is provided；
Fig. 4 is the structural representation of the embodiment of electronic equipment one that the present invention is provided；
Fig. 5 is the structural representation of another embodiment of electronic equipment that the present invention is provided.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described.It is understood that specific embodiment described herein is only used for explaining the present invention, rather than to limit of the invention
It is fixed.It also should be noted that, for the ease of description, illustrate only part related to the present invention in accompanying drawing and not all knot
Structure.Based on the embodiment in the present invention, what those of ordinary skill in the art were obtained under the premise of creative work is not made
Every other embodiment, belongs to the scope of protection of the invention.
Term " first ", " second ", " the 3rd ", " 4th " in the present invention etc. be for distinguishing different objects, rather than
For describing particular order.Additionally, term " comprising " and " having " and their any deformations, it is intended that covering is non-exclusive
Comprising.Process, method, system, product or the equipment for for example containing series of steps or unit are not limited to what is listed
Step or unit, but alternatively also include the step of not listing or unit, or alternatively also include for these processes, side
Method, product or other intrinsic steps of equipment or unit.
Referenced herein " embodiment " is it is meant that the special characteristic, structure or the characteristic that describe can be wrapped in conjunction with the embodiments
Containing at least one embodiment of the present invention.Each position in the description occur the phrase might not each mean it is identical
Embodiment, nor the independent or alternative embodiment with other embodiments mutual exclusion.Those skilled in the art explicitly and
Implicitly understand, embodiment described herein can be combined with other embodiments.
Electronic equipment provided in an embodiment of the present invention can be mobile phone, panel computer, Intelligent worn device etc..
Refering to Fig. 1, Fig. 1 is the structural representation of the embodiment of power protecting circuit one that the present invention is provided, the power protection
Circuit 10 is coupled between power supply 20 and load 30.
Specifically, the power protecting circuit includes that on-off circuit 11 and first detects circuit 12.
On-off circuit 11 couples power supply 20 and load 30；Wherein, when on-off circuit 11 is turned on, power supply 20 is supplied to load 30
Electricity.
Generally, it is not directly connected between protection circuit 10 and load 30, in the electronic device, is connect generally by outside one
Mouth connection, the interface can be here not required with earphone interface, USB interface, HDMI etc..
The first detection coupling of circuit 12 load 30 and on-off circuit 11；Wherein, on-off circuit 11 is used in the first detection electricity
When the voltage satisfaction that road 12 detects load 30 imposes a condition, the supply access between deenergization 20 and load 30.
Wherein, when protection circuit 10 is connected with load 30 by an external interface, the voltage of detection load 30 here
Can also be the voltage for detecting the external interface.
It should be understood that we are generally required when 30 short circuit is loaded, the power supply between deenergization 20 and load 30 is led to
Road, to reach the purpose of protection power supply 20, therefore, imposing a condition here can be the short circuit of load 30, that is, load 30 voltage
During for 0V, with regard to the supply access between deenergization 20 and load 30.Certainly in other embodiments, it is also possible to set a voltage
Threshold value, for example, when the voltage that the first detection circuit 12 detects load 30 is less than the given threshold, on-off circuit 11 just disconnects
Supply access between power supply 20 and load 30.
Optionally, the on-off circuit 11 can be an electronic switch, and it includes two connection ends and a control end, two
Individual connection end connects power supply 20 and load 30 respectively, and control end then connects the first detection circuit 12, according to the first inspection for receiving
The unlike signal that slowdown monitoring circuit 12 sends, carrys out being turned on and off for 11 two connection ends of controlling switch circuit.
Optionally, this first detection circuit 12 can be one by chip and/or component built-up circuit, it being capable of basis
The voltage of load 30 sends different control signals to on-off circuit 11, with being turned on and off for controlling switch circuit 11.
Specifically, illustrated with an example here.The on-off circuit 11 can be a metal-oxide-semiconductor, be with N-MOS pipes
Example, its source electrode connection power supply 20, drain electrode connection load 30, grid connection first detects circuit 12.First detection circuit 12 is in inspection
Measure load 30 voltage it is normal when, to N-MOS pipes grid send a voltage signal, voltage of the voltage signal than power supply 20
It is also high, and the voltage signal is more than the cut-in voltage of the N-MOS pipes with the difference of the voltage of power supply 20 so that and N-MOS pipes are led
Logical, power supply 20 is normally for load 30 is powered.First detects circuit 12 when it is 0 to detect the voltage for loading 30, to N-MOS pipes
Grid sends another voltage signal, and the voltage signal can be 0, or very low voltage signal, than the voltage of power supply 20
Bottom, or the voltage signal is less than the cut-in voltage of the N-MOS pipes with the difference of the voltage of power supply 20 so that N-MOS pipes are closed,
Supply access between power supply 20 and load 30 disconnects.
Through the above way, it becomes possible to during according to electric voltage exception (such as the short circuit) for loading, timely deenergization and load
Between supply access, certain protective effect is played to power supply.
Refering to Fig. 2, Fig. 2 is the structural representation of another embodiment of power protecting circuit that the present invention is provided, and the power supply is protected
Protection circuit 10 is coupled between power supply 20 and load 30.
Specifically, the power protecting circuit includes the detection detection circuit 13 of circuit 12 and second of on-off circuit 11, first.
On-off circuit 11 couples power supply 20 and load 30；Wherein, when on-off circuit 11 is turned on, power supply 20 is supplied to load 30
Electricity.
Generally, it is not directly connected between protection circuit 10 and load 30, in the electronic device, is connect generally by outside one
Mouth connection, the interface can be here not required with earphone interface, USB interface, HDMI etc..
Second detection circuit 13 coupling power supply 20 and on-off circuit 11；Wherein, the second detection circuit 13 is used in power supply 20
Voltage when raising, send a voltage signal to on-off circuit 11 so that on-off circuit 11 is turned on, power supply 20 is supplied to load 30
Electricity.
The first detection coupling of circuit 12 load 30 and on-off circuit 11；Wherein, on-off circuit 11 is used in the first detection electricity
When the voltage satisfaction that road 12 detects load 30 imposes a condition, the supply access between deenergization 20 and load 30.
Wherein, when protection circuit 10 is connected with load 30 by an external interface, the voltage of detection load 30 here
Can also be the voltage for detecting the external interface.
It should be understood that the first detection circuit 12 in the present embodiment is with the first detection circuit 12 in above-described embodiment
Identical, increased the second detection circuit 13 in addition, and on-off circuit 11 is turned on at the power supply initial stage.
Optionally, the on-off circuit 11 can be an electronic switch, and it includes two connection ends and a control end, two
Individual connection end connects power supply 20 and load 30 respectively, and control end then connects the first detection circuit 12 and the second detection circuit 13, root
According to the unlike signal that the first detection detection circuit 13 of circuit 12 and second for receiving sends, come 11 two companies of controlling switch circuit
Connect being turned on and off for end.
Optionally, the first detection detection circuit 13 of circuit 12 and second can be one by chip and/or component group
Into circuit, it can send different control signals according to the voltage of load 30 to on-off circuit 11, with controlling switch circuit 11
Be turned on and off.
Specifically, illustrated with an example here.The on-off circuit 11 can be a metal-oxide-semiconductor, be with N-MOS pipes
Example, its source electrode connection power supply 20, drain electrode connection load 30, grid connection first detects the detection circuit 13 of circuit 12 and second.
Power supply initial stage, the voltage of the second detection detection power supply 20 of circuit 13 is constantly raised, then send a voltage signal, and the voltage signal makes
On-off circuit 11 is obtained to turn on.After the conducting of switch 11, first detects circuit 12 when the voltage for detecting load 30 is normal, to N-
The grid of metal-oxide-semiconductor sends a voltage signal, and the voltage signal is also higher than the voltage of power supply 20, and the voltage signal and power supply 20
Voltage difference more than the N-MOS pipes cut-in voltage so that N-MOS pipes are held on, power supply 20 normally for load 30 supply
Electricity.First detection circuit 12 sends another voltage signal when it is 0 to detect the voltage for loading 30 to the grid of N-MOS pipes, should
Voltage signal can be 0, or very low voltage signal, than the voltage bottom of power supply 20, or the voltage signal and power supply
Cut-in voltage of the difference of 20 voltage less than the N-MOS pipes so that N-MOS pipes are closed, the confession between power supply 20 and load 30
Electric pathway disconnects.
Through the above way, it becomes possible to during according to electric voltage exception (such as the short circuit) for loading, timely deenergization and load
Between supply access, certain protective effect is played to power supply.
Refering to Fig. 3, Fig. 3 is the electrical block diagram of the power protecting circuit another embodiment that the present invention is provided.The electricity
Road specifically includes on-off circuit, the first detection circuit and the second detection circuit.
Wherein, on-off circuit specifically includes first switch.
In the present embodiment, first switch be P-MOS pipe, including grid (G), source electrode (S) and drain electrode (D), two switch be
NPN type triode, including base stage (B), emitter stage (E) and colelctor electrode (C).
Specifically, the S poles connection coupling power supply 20 of first switch, its D pole coupling loads 30, and its G pole coupling first is detected
Circuit and the second detection circuit.
Wherein, the second detection circuit includes：
First resistor R1, its first end coupling power supply 20, its second end ground connection；Second resistance R2, its first end coupling electricity
Source 20, its second end couples the G poles of first switch Q1；Electric capacity C1, second end of its first end coupling second resistance R2, it second
End ground connection.
Wherein, the first detection circuit includes：
3rd resistor R3, the coupling load of its first end；4th resistance R4, the second of its first end coupling 3rd resistor R3
End, its second end ground connection；Second switch Q2, second end of its control end coupling 3rd resistor R3, its first end coupling first is opened
Close the control end of Q1, its second end ground connection.
Wherein, second switch is NPN type triode, and its B pole couples second end of 3rd resistor R3, its C pole coupling first
Switch the control end of Q1, its E pole ground connection.
As shown in figure 3, the operation principle of the circuit of this implementation is：
Electric power output voltage is A point voltages, and load voltage is B point voltages, and the voltage of the G poles of P-MOS pipes Q1 is equal to C
Point magnitude of voltage, the B pole tensions of triode Q2 are equal to D point voltages.
When A points voltage from scratch when, C1 is charged by R1, the voltage of C points begins to ramp up from 0V, A points electricity
The block that pressure ratio C points rise, 1V (cut-in voltage of Q1) is more than with the difference of the S pole tensions of Q1 and G pole tensions, so Q1 is turned on,
So as to the voltage of B points is equal to the voltage of A points, the voltage of D points begins to ramp up.When the voltage of D points reaches 0.7V (the unlatching electricity of Q2
Pressure) more than when, Q2 conductings, the voltage of C points begins to decline, and Q1 is fully on and keeps.When there is short circuit condition in load (quite
It is grounded in B points), the voltage of D points begins to decline with B point voltages, and when below 0.7V is dropped to, Q2 is not turned on, and the voltage of C points passes through
R1 carries out charging and begins to ramp up to C1, when the voltage ratio C point voltages for rising to A points it is high less than 1V when, Q1 is not turned on, so as to cut off
Current path, excessively stream is not exported to protect electronic equipment.
It should be understood that the type of the Q1 and Q2 in above-described embodiment, and the cut-in voltage of Q1 and Q2 is citing, and
It is not to limit species and model that breaker in middle pipe of the present invention is used.
Refering to Fig. 4, Fig. 4 is the structural representation of the embodiment of electronic equipment one that the present invention is provided, and the electronic equipment includes
Power supply 20, power protecting circuit 10 and the power supply interface 40 being sequentially connected, the connection load of power supply interface 40 is with to load supplying.
Wherein, the power supply interface 40 can be here not required with earphone interface, USB interface, HDMI etc..
Wherein, the power protecting circuit 10 can be arranged on the mainboard of electronic equipment internal, in other embodiments,
Can be integrally disposed with other protection circuits of battery.Such as waterproof circuit, intrinsically safe circuit etc..
Specifically, the power protecting circuit includes that on-off circuit 11 and first detects circuit 12.It should be understood that this reality
It is the protection circuit as introduced in above-mentioned embodiment, its circuit structure and implementation principle class to apply the power protecting circuit 10 in example
Seemingly, repeat no more here.
Refering to Fig. 5, Fig. 5 is the structural representation of another embodiment of electronic equipment that the present invention is provided, the electronic equipment bag
Power supply 20, power protecting circuit 10 and the power supply interface 40 being sequentially connected are included, the connection of power supply interface 40 load is supplied with to load
Electricity.
Specifically, the power protecting circuit includes the detection detection circuit 13 of circuit 12 and second of on-off circuit 11, first.
It should be understood that the power protecting circuit 10 in the present embodiment is the protection circuit as introduced in above-mentioned embodiment, its circuit knot
Structure is similar with implementation principle, repeats no more here.
A kind of mobile terminal and its photographic method for being provided the embodiment of the present invention above are described in detail, herein
In apply specific case principle of the invention and implementation method be set forth, the explanation of above example is only intended to side
Assistant solves technical scheme and its core concept；It will be understood by those within the art that：It still can be right
Technical scheme described in foregoing embodiments is modified, or carries out equivalent to which part technical characteristic；And this
A little modifications are replaced, and do not make the scope of the technical scheme of the essence disengaging various embodiments of the present invention of appropriate technical solution.
Claims (10)
1. a kind of power protecting circuit, it is characterised in that including：
On-off circuit, couples power supply and load；Wherein, when the on-off circuit is turned on, the power supply is to the load supplying；
First detection circuit, couples the load and the on-off circuit；
Wherein, the on-off circuit is used to meet in the voltage of the described first detection electric circuit inspection to the load and imposes a condition
When, disconnect the supply access between the power supply and the load.
2. power protecting circuit according to claim 1, it is characterised in that
The power protecting circuit also includes the second detection circuit, during for being raised in the voltage for detecting the power supply, control
The on-off circuit conducting, so that the power supply is to the load supplying.
3. power protecting circuit according to claim 2, it is characterised in that
The on-off circuit includes first switch, and its first end couples the power supply, and its second end couples the load, its control
The end coupling first detection circuit and the second detection circuit.
4. power protecting circuit according to claim 3, it is characterised in that
The first switch is managed for P-MOS, and its S pole connection coupling power supply, its D pole couples the load, its G pole coupling institute
State the first detection circuit and the second detection circuit.
5. power protecting circuit according to claim 4, it is characterised in that
The second detection circuit couples the G poles of the power supply and the first switch, specifically for detecting the power supply
Voltage when raising, make the pressure difference of the S poles of the first switch and G poles more than setting value so that the first switch is turned on, with
Make the power supply to the load supplying；
The first detection circuit coupling load and the G poles of the first switch, meet for the voltage in the load
When imposing a condition, make the pressure difference of the S poles of the first switch and G poles less than setting value, so that the first switch disconnects；And
Pressure difference for when the voltage of the load is unsatisfactory for imposing a condition, making the S poles of the first switch and G poles remains big
In setting value.
6. power protecting circuit according to claim 5, it is characterised in that
The second detection circuit includes：
First resistor, its first end couples the power supply, its second end ground connection；
Second resistance, its first end couples the power supply, and its second end couples the G poles of the first switch；
Electric capacity, its first end couples the second end of the second resistance, its second end ground connection.
7. power protecting circuit according to claim 5, it is characterised in that
The first detection circuit includes：
3rd resistor, its first end couples the load；
4th resistance, its first end couples the second end of the 3rd resistor, its second end ground connection；
Second switch, its control end couples the second end of the 3rd resistor, and its first end couples the control of the first switch
End, its second end ground connection.
8. power protecting circuit according to claim 7, it is characterised in that
The second switch is NPN type triode, and its B pole couples the second end of the 3rd resistor, its C pole coupling described first
The control end of switch, its E pole ground connection.
9. power protecting circuit according to claim 1, it is characterised in that
It is described to impose a condition as the voltage of the load is 0V.
10. a kind of electronic equipment, it is characterised in that including the power supply, power protecting circuit and the power supply interface that are sequentially connected, institute
Power supply interface connection load is stated with to the load supplying；
Wherein, the power protecting circuit is the power protecting circuit as described in claim any one of 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710294497.6A CN106877283A (en) | 2017-04-28 | 2017-04-28 | A kind of electronic equipment and its power protecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710294497.6A CN106877283A (en) | 2017-04-28 | 2017-04-28 | A kind of electronic equipment and its power protecting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106877283A true CN106877283A (en) | 2017-06-20 |
Family
ID=59161861
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710294497.6A Pending CN106877283A (en) | 2017-04-28 | 2017-04-28 | A kind of electronic equipment and its power protecting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106877283A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107645151A (en) * | 2017-09-29 | 2018-01-30 | 努比亚技术有限公司 | A kind of current foldback circuit, control method and device, terminal |
| CN110209090A (en) * | 2019-06-14 | 2019-09-06 | 国网江苏省电力有限公司常州供电分公司 | Intelligent cable well lid |
| CN113937837A (en) * | 2020-07-14 | 2022-01-14 | Oppo广东移动通信有限公司 | Charging circuit and electronic device |
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| CN203135390U (en) * | 2012-12-26 | 2013-08-14 | 西安Tcl软件开发有限公司 | Over-current protection circuit and electronic apparatus |
| CN203466557U (en) * | 2013-06-18 | 2014-03-05 | 北京经纬恒润科技有限公司 | Vehicle-borne low-voltage power output short-circuit protection circuit |
| CN104252216A (en) * | 2013-06-28 | 2014-12-31 | 鸿富锦精密工业(武汉)有限公司 | Anti-creeping USB (universal serial bus) power supply circuit |
| CN104410036A (en) * | 2014-11-14 | 2015-03-11 | 深圳市九洲电器有限公司 | HDMI (high-definition multimedia interface) power supply protective circuit and audio and video equipment |
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| CN201594876U (en) * | 2010-01-30 | 2010-09-29 | 青岛海信电器股份有限公司 | Interface power supply circuit and television with same |
| CN203135390U (en) * | 2012-12-26 | 2013-08-14 | 西安Tcl软件开发有限公司 | Over-current protection circuit and electronic apparatus |
| CN203466557U (en) * | 2013-06-18 | 2014-03-05 | 北京经纬恒润科技有限公司 | Vehicle-borne low-voltage power output short-circuit protection circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107645151A (en) * | 2017-09-29 | 2018-01-30 | 努比亚技术有限公司 | A kind of current foldback circuit, control method and device, terminal |
| CN110209090A (en) * | 2019-06-14 | 2019-09-06 | 国网江苏省电力有限公司常州供电分公司 | Intelligent cable well lid |
| CN113937837A (en) * | 2020-07-14 | 2022-01-14 | Oppo广东移动通信有限公司 | Charging circuit and electronic device |
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Application publication date: 20170620 |