CN109861167A - Interface short circuit protection circuit and set-top box - Google Patents
Interface short circuit protection circuit and set-top box Download PDFInfo
- Publication number
- CN109861167A CN109861167A CN201811628301.3A CN201811628301A CN109861167A CN 109861167 A CN109861167 A CN 109861167A CN 201811628301 A CN201811628301 A CN 201811628301A CN 109861167 A CN109861167 A CN 109861167A
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- China
- Prior art keywords
- interface
- short
- unit
- oxide
- metal
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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
-
- 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
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/426—Internal components of the client ; Characteristics thereof
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Protection Of Static Devices (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention relates to a kind of interface short circuit protection circuit of the present invention and set-top box, which includes fuse unit, metal-oxide-semiconductor unit and short detection unit.The present invention is when short circuit occurs for interface, fuse unit disconnects, and short detection unit controls metal-oxide-semiconductor unit and disconnects, to disconnect power supply of the power supply to interface, the short-circuit damage caused by interface is effectively prevented, guarantees interface and electronic product normal use and safety.
Description
Technical field
The present invention relates to short-circuit protection circuit more particularly to a kind of interface short circuit protection circuits and set-top box.
Background technique
Currently, with various insert type interfaces electronic product (such as set-top box, smart television etc.) in life with
Place is as it can be seen that almost spread to every family.During use, some interface plug frequencies can compare these electronic products
It is high.
But during plug interface, since each interface has energization pins and grounding pin, then in plug
In the process if Interface design does not match strictly with the design of the connector of insertion or user's operation is improper, power supply is be easy to cause to draw
Foot and grounding pin short circuit, there is a situation where interface short circuit, such as mini AV interface and external IR interface etc., this short circuits
It is light then cause other module short duration failures using same voltage, it is heavy then electronic product is caused to restart, if more serious short-circuit
Overlong time can then burn interface, this all carrys out very big influence to interface and electronic product normal use and safety belt.
Summary of the invention
In view of this, it is necessary to be easy to happen the problem of short circuit for above-mentioned interface, a kind of interface short circuit protection electricity is provided
Road and set-top box.
The present invention provides a kind of interface short circuit protection circuit, comprising: fuse unit, metal-oxide-semiconductor unit and short-circuit detecting
Unit；Fuse unit one end connects the metal-oxide-semiconductor unit, other end connecting interface, described in the metal-oxide-semiconductor unit connection
Fuse unit and power supply, the short detection unit connect between the fuse unit and interface, and with the MOS
Whether pipe unit connection, real-time detection interface occur short circuit；When interface is not short-circuit, the fuse unit and metal-oxide-semiconductor unit are equal
Conducting；When short circuit occurs for interface, the fuse unit is disconnected, and the short detection unit detects that short circuit occurs for interface in turn
And control the metal-oxide-semiconductor unit and close, power supply of the power supply to interface is disconnected, the short detection unit is detecting short circuit
The metal-oxide-semiconductor unit is controlled after releasing be connected again restore electricity.
Further, the metal-oxide-semiconductor unit includes metal-oxide-semiconductor, capacitor, first resistor, second resistance and 3rd resistor；It is described
The pole D of metal-oxide-semiconductor connects the fuse unit, and the pole S connects power supply, and the pole G connects one end of the capacitor and first resistor,
The capacitor other end connects the pole S, and the first resistor other end connects one end of the second resistance and 3rd resistor, described
The second resistance other end connects the pole S, and the 3rd resistor other end connects the short detection unit.
Further, when there is no when short circuit, the short detection unit output low level, the metal-oxide-semiconductor is led for interface
Logical, there is voltage output at fuse unit rear；When short circuit occurs for interface, the short detection unit exports high level,
The metal-oxide-semiconductor is closed, and fuse unit rear does not have voltage output.
Further, when short circuit occurs for interface, issue short circuit notice prompt user's pause makes the short detection unit
With the interface that short circuit occurs.
Further, the equipment for being inserted into interface when short circuit occurs for short detection unit record, when similar devices again
Using carrying out early warning when interface.
The present invention also provides a kind of set-top boxes, including interface, further include interface short circuit protection circuit；The interface short circuit is anti-
Protection circuit includes fuse unit, metal-oxide-semiconductor unit and short detection unit；Fuse unit one end connects the MOS
Pipe unit, other end connecting interface, the metal-oxide-semiconductor unit connect the fuse unit and power supply, the short-circuit detecting
Unit connects between the fuse unit and interface, and connect with the metal-oxide-semiconductor unit, and it is short whether real-time detection interface occurs
Road；When interface is not short-circuit, the fuse unit and metal-oxide-semiconductor unit are both turned on；When short circuit occurs for interface, the fuse unit
It disconnects, the short detection unit detects that short circuit occurs for interface and controls the metal-oxide-semiconductor unit to close in turn, disconnects power supply electricity
Power supply of the source to interface, the short detection unit detect short circuit release after control the metal-oxide-semiconductor unit be connected again it is extensive
Multiple power supply.
Further, the metal-oxide-semiconductor unit includes metal-oxide-semiconductor, capacitor, first resistor, second resistance and 3rd resistor；It is described
The pole D of metal-oxide-semiconductor connects the fuse unit, and the pole S connects power supply, and the pole G connects one end of the capacitor and first resistor,
The capacitor other end connects the pole S, and the first resistor other end connects one end of the second resistance and 3rd resistor, described
The second resistance other end connects the pole S, and the 3rd resistor other end connects the short detection unit.
Further, when there is no when short circuit, the short detection unit output low level, the metal-oxide-semiconductor is led for interface
Logical, there is voltage output at fuse unit rear；When short circuit occurs for interface, the short detection unit exports high level,
The metal-oxide-semiconductor is closed, and fuse unit rear does not have voltage output.
Further, when short circuit occurs for interface, issue short circuit notice prompt user's pause makes the short detection unit
With the interface that short circuit occurs.
Further, the equipment for being inserted into interface when short circuit occurs for short detection unit record, when similar devices again
Using carrying out early warning when interface.
Interface short circuit protection circuit and set-top box of the present invention, when short circuit occurs for interface, fuse unit is disconnected, short circuit inspection
It surveys unit control metal-oxide-semiconductor unit to disconnect, to disconnect power supply of the power supply to interface, effectively prevents short circuit from causing to interface
Damage, guarantee interface and electronic product normal use and safety.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the structure chart of the interface short circuit protection circuit in one embodiment；
Fig. 2 is the concrete structure diagram of the interface short circuit protection circuit in one embodiment.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Interface short circuit protection circuit of the invention is arranged among interface power supply line, when short circuit occurs for interface, cutting
Power supply of the power supply to interface, protects interface.
Fig. 1 is the structure chart of the interface short circuit protection circuit in one embodiment, which includes: to protect
Dangerous silk unit 100, metal-oxide-semiconductor unit 200 and short detection unit 300.100 one end of fuse unit connects metal-oxide-semiconductor unit
200, other end connecting interface.Metal-oxide-semiconductor unit 200 connects fuse unit 100 and power supply.Short detection unit 300 connects
It connects between fuse unit 100 and interface, and is connect with metal-oxide-semiconductor unit 200, whether real-time detection interface occurs short circuit.Interface
When not short-circuit, fuse unit 100 and metal-oxide-semiconductor unit 200 are both turned on；When short circuit occurs for interface, fuse unit 100 is disconnected
It opens, short detection unit 300 detects that interface occurs short circuit and controls the closing of metal-oxide-semiconductor unit 200 in turn, disconnects power supply pair
The power supply of interface.The control metal-oxide-semiconductor unit 200 after detecting that short circuit releases of short detection unit 300 is connected again to restore electricity.
Fig. 2 is the concrete structure diagram of the interface short circuit protection circuit in one embodiment, in conjunction with Fig. 1, metal-oxide-semiconductor unit 200
Including metal-oxide-semiconductor Q1, capacitor C1, first resistor R1, second resistance R2 and 3rd resistor R3.The pole D (drain electrode) of metal-oxide-semiconductor Q1, which connects, to be protected
Dangerous silk unit 100, the pole S (source electrode) connect power supply, and the pole G (grid) connects one end of capacitor C1 and first resistor R1.Capacitor
The C1 other end connects the pole S.One end of the connection of the first resistor R1 other end second resistance R2 and 3rd resistor R3.Second resistance R2 is another
One end connects the pole S.The 3rd resistor R3 other end connects short detection unit 300.
When there is no when short circuit, short detection unit 300 exports low level, metal-oxide-semiconductor Q1 conducting, fuse unit for interface
There is voltage output at the 100 rears end VCC_MOS；When short circuit occurs for interface, short detection unit 300 exports high level, metal-oxide-semiconductor Q1
It closes, the end VCC_MOS does not have voltage output.Fuse unit 100 can open a way in short circuit overcurrent, and the end VCC_MOS does not have at this time
Output, the end VCC_MOS voltage are 0, feed back to short detection unit 300, short detection unit 300, which exports high level, makes metal-oxide-semiconductor
Q1 is closed, to disconnect the power supply of power supply, protection interface.Hereafter, short detection unit 300, which does not stop detection interface short circuit, is
No releasing, when detecting that short circuit releases, short detection unit 300 exports low level again is connected metal-oxide-semiconductor Q1, interface power supply
Restore normal, to effectively prevent the short-circuit damage caused by interface, guarantees interface and electronic product normal use and safety.
Further, short detection unit 300 issues short circuit and notifies prompt user suspends to use when short circuit occurs for interface
The interface of short circuit occurs, in order to avoid insertion equipment is damaged.
Further, short detection unit 300 record occur short circuit when be inserted into interface equipment, when similar devices again
Using early warning is carried out when interface, prompt user proper use of or more exchange device.
In addition, the set-top box includes interface and interface short circuit protection circuit the present invention also provides a kind of set-top box.Knot
Fig. 1 and Fig. 2 is closed, which includes: fuse unit 100, metal-oxide-semiconductor unit 200 and short detection unit
300.100 one end of fuse unit connects metal-oxide-semiconductor unit 200, other end connecting interface.Metal-oxide-semiconductor unit 200 connects fuse list
Member 100 and power supply.Short detection unit 300 connects between fuse unit 100 and interface, and connects with metal-oxide-semiconductor unit 200
It connects, whether real-time detection interface occurs short circuit.When interface is not short-circuit, fuse unit 100 and metal-oxide-semiconductor unit 200 are both turned on；?
When short circuit occurs for interface, fuse unit 100 is disconnected, and short detection unit 300 detects that interface occurs short circuit and controls in turn
Metal-oxide-semiconductor unit 200 is closed, and power supply of the power supply to interface is disconnected.Short detection unit 300 is controlled after detecting that short circuit releases
Metal-oxide-semiconductor unit 200 processed is connected again and restores electricity.
Metal-oxide-semiconductor unit 200 includes metal-oxide-semiconductor Q1, capacitor C1, first resistor R1, second resistance R2 and 3rd resistor R3.MOS
The pole D (drain electrode) of pipe Q1 connects fuse unit 100, and the pole S (source electrode) connects power supply, the pole G (grid) connect capacitor C1 and
One end of first resistor R1.The capacitor C1 other end connects the pole S.The first resistor R1 other end connects second resistance R2 and 3rd resistor
One end of R3.The second resistance R2 other end connects the pole S.The 3rd resistor R3 other end connects short detection unit 300.
When there is no when short circuit, short detection unit 300 exports low level, metal-oxide-semiconductor Q1 conducting, fuse unit for interface
There is voltage output at the 100 rears end VCC_MOS；When short circuit occurs for interface, short detection unit 300 exports high level, metal-oxide-semiconductor Q1
It closes, the end VCC_MOS does not have voltage output.Fuse unit 100 can open a way in short circuit overcurrent, and the end VCC_MOS does not have at this time
Output, the end VCC_MOS voltage are 0, feed back to short detection unit 300, short detection unit 300, which exports high level, makes metal-oxide-semiconductor
Q1 is closed, to disconnect the power supply of power supply, protection interface.Hereafter, short detection unit 300, which does not stop detection interface short circuit, is
No releasing, when detecting that short circuit releases, short detection unit 300 exports low level again is connected metal-oxide-semiconductor Q1, interface power supply
Restore normal, to effectively prevent the short-circuit damage caused by interface, guarantees interface and electronic product normal use and safety.
Further, short detection unit 300 issues short circuit and notifies prompt user suspends to use when short circuit occurs for interface
The interface of short circuit occurs, in order to avoid insertion equipment is damaged.
Further, short detection unit 300 record occur short circuit when be inserted into interface equipment, when similar devices again
Using early warning is carried out when interface, prompt user proper use of or more exchange device.
The set-top box has interface short circuit protection circuit, to effectively prevent short circuit caused by set top box interface
Damage guarantees set top box interface and set-top box normal use and safety.
Interface short circuit protection circuit and set-top box of the present invention, when short circuit occurs for interface, fuse unit is disconnected, short circuit inspection
It surveys unit control metal-oxide-semiconductor unit to disconnect, to disconnect power supply of the power supply to interface, effectively prevents short circuit from causing to interface
Damage, guarantee interface and electronic product normal use and safety.
The above is merely preferred embodiments of the present invention, be not intended to limit the invention, it is all in spirit of the invention and
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within principle.
Claims (10)
1. a kind of interface short circuit protection circuit characterized by comprising fuse unit, metal-oxide-semiconductor unit and short-circuit detecting list
Member；Fuse unit one end connects the metal-oxide-semiconductor unit, other end connecting interface, and the metal-oxide-semiconductor unit connects the guarantor
Dangerous silk unit and power supply, the short detection unit connect between the fuse unit and interface, and with the metal-oxide-semiconductor
Whether unit connection, real-time detection interface occur short circuit；When interface is not short-circuit, the fuse unit and metal-oxide-semiconductor unit are led
It is logical；When short circuit occurs for interface, the fuse unit is disconnected, and the short detection unit detects that short circuit occurs for interface simultaneously in turn
It controls the metal-oxide-semiconductor unit to close, disconnects power supply of the power supply to interface, the short detection unit is detecting short-circuit solution
The metal-oxide-semiconductor unit is controlled after removing be connected again restore electricity.
2. interface short circuit protection circuit according to claim 1, which is characterized in that the metal-oxide-semiconductor unit include metal-oxide-semiconductor,
Capacitor, first resistor, second resistance and 3rd resistor；The pole D of the metal-oxide-semiconductor connects the fuse unit, the connection power supply of the pole S
Power supply, the pole G connect one end of the capacitor and first resistor, and the capacitor other end connects the pole S, the first resistor other end
One end of the second resistance and 3rd resistor is connected, the second resistance other end connects the pole S, the 3rd resistor other end
Connect the short detection unit.
3. interface short circuit protection circuit according to claim 2, which is characterized in that when interface is there is no when short circuit, institute
Short detection unit output low level is stated, the metal-oxide-semiconductor conducting, there is voltage output at fuse unit rear；When interface is sent out
When raw short circuit, the short detection unit exports high level, and the metal-oxide-semiconductor is closed, and fuse unit rear does not have voltage
Output.
4. interface short circuit protection circuit according to claim 1, which is characterized in that the short detection unit is sent out in interface
When raw short circuit, issues short circuit notice prompt user and suspend using the interface that short circuit occurs.
5. interface short circuit protection circuit according to claim 1, which is characterized in that the short detection unit record occurs
The equipment that interface is inserted into when short-circuit, early warning is carried out when similar devices reuse interface.
6. a kind of set-top box, including interface, which is characterized in that further include interface short circuit protection circuit；The interface short circuit protection
Circuit includes fuse unit, metal-oxide-semiconductor unit and short detection unit；Fuse unit one end connects the metal-oxide-semiconductor
Unit, other end connecting interface, the metal-oxide-semiconductor unit connect the fuse unit and power supply, the short-circuit detecting list
Member connects between the fuse unit and interface, and connect with the metal-oxide-semiconductor unit, and it is short whether real-time detection interface occurs
Road；When interface is not short-circuit, the fuse unit and metal-oxide-semiconductor unit are both turned on；When short circuit occurs for interface, the fuse unit
It disconnects, the short detection unit detects that short circuit occurs for interface and controls the metal-oxide-semiconductor unit to close in turn, disconnects power supply electricity
Power supply of the source to interface, the short detection unit detect short circuit release after control the metal-oxide-semiconductor unit be connected again it is extensive
Multiple power supply.
7. set-top box according to claim 6, which is characterized in that the metal-oxide-semiconductor unit includes metal-oxide-semiconductor, capacitor, the first electricity
Resistance, second resistance and 3rd resistor；The pole D of the metal-oxide-semiconductor connects the fuse unit, and the pole S connects power supply, and the pole G connects
Connect one end of the capacitor and first resistor, the capacitor other end connects the pole S, the first resistor other end connection described the
One end of two resistance and 3rd resistor, the second resistance other end connect the pole S, and the 3rd resistor other end connection is described short
Road detection unit.
8. set-top box according to claim 7, which is characterized in that when interface is there is no when short circuit, the short-circuit detecting
Unit exports low level, and the metal-oxide-semiconductor conducting, there is voltage output at fuse unit rear；When short circuit occurs for interface, institute
Short detection unit output high level is stated, the metal-oxide-semiconductor is closed, and fuse unit rear does not have voltage output.
9. set-top box according to claim 6, which is characterized in that the short detection unit interface occur short circuit when,
Short circuit notice prompt user is issued to suspend using the interface that short circuit occurs.
10. set-top box according to claim 6, which is characterized in that the short detection unit record occurs to insert when short circuit
The equipment of incoming interface carries out early warning when similar devices reuse interface.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811628301.3A CN109861167A (en) | 2018-12-28 | 2018-12-28 | Interface short circuit protection circuit and set-top box |
| PCT/CN2019/107521 WO2020134234A1 (en) | 2018-12-28 | 2019-09-24 | Short circuit protection circuit of interface and set-top box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811628301.3A CN109861167A (en) | 2018-12-28 | 2018-12-28 | Interface short circuit protection circuit and set-top box |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109861167A true CN109861167A (en) | 2019-06-07 |
Family
ID=66893022
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811628301.3A Pending CN109861167A (en) | 2018-12-28 | 2018-12-28 | Interface short circuit protection circuit and set-top box |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN109861167A (en) |
| WO (1) | WO2020134234A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020134234A1 (en) * | 2018-12-28 | 2020-07-02 | 深圳市九洲电器有限公司 | Short circuit protection circuit of interface and set-top box |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2020134234A1 (en) | 2020-07-02 |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190607 |
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