CN103747305B - A kind of anti-burnout circuit and set-top box - Google Patents
A kind of anti-burnout circuit and set-top box Download PDFInfo
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- CN103747305B CN103747305B CN201310747062.4A CN201310747062A CN103747305B CN 103747305 B CN103747305 B CN 103747305B CN 201310747062 A CN201310747062 A CN 201310747062A CN 103747305 B CN103747305 B CN 103747305B
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Abstract
The present invention provides a kind of anti-burnout circuit and set-top box, it is related to electronic circuit technology field, circuit therein includes communication interface and system signal ground, and described communication interface includes communication interface signal ground, and described communication interface signal ground is connected by magnetic bead with system signal.The present invention can realize the effect of good Anti-burnout, solve the problems, such as that the interface transmission line of existing electronic equipment easily causes electronic equipment and burns.
Description
Technical field
The present invention relates to electronic circuit technology field, more particularly to a kind of anti-burnout circuit and set-top box.
Background technology
The need for existing electronic equipment is due to interconnection and communication, comprising increasing communication interface, such as comprising as follows
Communication interface：Network communication interface, serial ports, video interface and COBBAIF etc..When these interfaces are connected with other equipment, pass
The length of defeated line and the placement location of electronic equipment have relation, length from several meters to tens meters, and these transmission lines due to
There is no unified specification and workmen's technological disparity, cause transmission line situation quite chaotic.Forceful electric power light current is not accomplished such as
Separate, do not accomplish house line and outside wire separation etc..This result in some transmission lines there may be it is normal higher than transmission line
In the case of several times even hundred times energy, when these energy are transmitted in transmission line, may result in and transmission line
The device damage of connection.
By taking Set Top Box as an example, traditional design directly or indirectly connects between the interface shielding ground and signal ground of Set Top Box
Be connected together, so as to cause from transmission line shielding on the ground transmission energy reach Set Top Box when, may be by Set Top Box
, so that docking port device and electronic component bring fatal damage, or even there is Set Top Box and burns in signal ground.
The content of the invention
The technical problem to be solved in the present invention, is to provide a kind of anti-burnout circuit and set-top box, solves existing electronics
The interface transmission line of equipment easily causes the problem that electronic equipment burns.
What the present invention was realized in：
A kind of anti-burnout circuit, comprising communication interface and system signal ground, described communication interface includes communication interface
Signal ground, described communication interface signal ground is connected by magnetic bead with system signal.
Further, the anti-burnout circuit also includes screw hole, first resistor, the first electric capacity and the first electrical surge
Suppressor, described screw hole connects the negative of one end, one end of first resistor and the first electrical surge suppressor of the first electric capacity
End, described system signal ground connects the other end, the other end of first resistor and the first electrical surge suppressor of the first electric capacity
Anode.
Further, the frequency of the RC network of described first resistor and the first electric capacity composition is 40Hz~60Hz.
Further, the first resistor resistance for megaohm more than, first electric capacity be high-voltage capacitance, first wink
State surge suppressor it is pressure-resistant for more than 240V.
Further, also comprising casing ground, second resistance and the second electric capacity, described casing ground is even for the anti-burnout circuit
Connect one end of second resistance and one end of the second electric capacity, the other end of system signal ground connection second resistance and the second electric capacity it is another
One end.
Further, the anti-burnout circuit also includes the second electrical surge suppressor, described casing ground and the second wink
The negative terminal connection of state surge suppressor, described communication interface signal ground is connected with the anode of the second electrical surge suppressor.
Further, the frequency of the RC network of described second resistance and the second electric capacity composition is 40Hz~60Hz.
Further, the second resistance resistance for megaohm more than, second electric capacity be high-voltage capacitance, second wink
State surge suppressor it is pressure-resistant for more than 240V.
The anti-burnout circuit also includes screw hole, casing ground, a resistance and an electric capacity, screw hole and casing
Ground, one end of resistance, one end connection of electric capacity, are connected casing with the other end of resistance, the other end of electric capacity.
Further, the frequency of the RC network of described resistance and electric capacity composition is 40Hz~60Hz.
Further, the resistance for megaohm more than, the electric capacity be high-voltage capacitance.
Further, described communication interface is without shielded communication interface.
And the present invention also provides a kind of Set Top Box of Anti-burnout, described Set Top Box is comprising above-mentioned any described anti-
Burn circuit.
The invention has the advantages that：
1st, by system signal and casing ground independently open, the loop that outside energy is transmitted is no longer pass through signal ground, so
Avoid transmitting damage of the heat input to the device of system；
2nd, the present invention realizes simple, low cost, well below reprocessing of bringing of Set Top Box device failure in addition scrap into
This, improves the income and stability of product；
3rd, the present invention will not bring influence while protective capacities is increased on the signal transmission of communication interface.
Brief description of the drawings
Fig. 1 is the circuit diagram of the preferred embodiment of the present invention.
Specific embodiment
To describe technology contents of the invention, structural feature, the objects and the effects in detail, below in conjunction with implementation method
And coordinate accompanying drawing to be explained in detail.
As shown in figure 1, being a kind of circuit diagram of the anti-burnout circuit for providing of the invention, believe comprising communication interface and system
Number ground, communication interface includes communication interface signal ground, and communication interface signal ground is connected by magnetic bead with system signal.Communication connects
Mouth can be divided into Interface for digital communication (such as serial ports, network interface) and analogue communication interface (such as video port, audio port), then corresponding
System signal ground with also including data signal and analog signal ground.COBBAIF CN1 in Fig. 1 with analogue communication interface is
Example, then the ground (i.e. communication interface signal ground) of COBBAIF CN1 is connected by magnetic bead L1 with the simulation in system signal ground, sound
The holding wire of frequency interface CN1 is connected with audio signal.If communication interface is Interface for digital communication, should be connected by magnetic bead
In system signal ground digitally.By the buffer action of magnetic bead, communication interface signal ground and system signal ground do not connect directly
Connect, then the energy being connected on the transmission line of communication interface will not produce impact to system signal quickly, it is to avoid transmission
Damage of the energy to circuit on line.
Further, this circuit also includes the suppression of screw hole H1, first resistor R1, the first electric capacity C1 and the first electrical surge
Device D1 processed, screw hole H1 connect one end, one end of first resistor R1 and the first electrical surge suppressor D1's of the first electric capacity C1
Negative terminal, system signal ground connects the other end, the other end of first resistor R1 and the first electrical surge suppressor of the first electric capacity C1
The anode of D1.By such treatment, screw hole circuit and system signal ground are not connected directly, then the energy on screw hole
System signal will not be directly delivered on the ground, damage of the external energy to circuit is further avoid.
In order to realize electromagnetic shielding, common electronic circuit can be comprising casing ground, and in this case, this circuit also includes machine
Shell ground (i.e. signal shielding ground), second resistance R2 and the second electric capacity C2, casing ground connects one end and second electricity of second resistance R2
Hold one end of C2, system signal ground connects the other end of second resistance R2 and the other end of the second electric capacity C2.Then casing ground be
System signal ground is completely independent out, and second resistance R2 and the second electric capacity C2 avoid impact of the energy on casing to circuit.
Preferably, this circuit also includes the second electrical surge suppressor D2, casing ground and the second electrical surge suppressor D2
Negative terminal connection, communication interface signal ground is connected with the anode of the second electrical surge suppressor D2.Screw hole in above-mentioned also may be used
It is directly connected to with casing, first resistor R1, the first electric capacity C1 and second resistance R2 and the second electric capacity C2 when being directly connected to
This four elements can be only with a resistance and an electric capacity.In order to play preferably isolation and protective effect, first
Resistance R1 resistances for megaohm more than, the first electric capacity C1 be high-voltage capacitance, the first electrical surge suppressor D1 it is pressure-resistant for 240V with
On, second resistance R2 resistances for megaohm more than, the second electric capacity C2 is high-voltage capacitance, and the second the pressure-resistant of electrical surge suppressor D2 be
More than 240V.First resistor R1 and the first electric capacity C1 and second resistance R2 and the second electric capacity C2 composition RC nets more than simultaneously
Network, frequency is in power frequency scope, i.e. 40Hz-60Hz.
In order to avoid transmitting the impact of heat input, communication interface is preferably without shielded communication interface, or is being adopted
During the shielded communication interface of apparatus, pin is vacantly shielded.
On the basis of foregoing circuit, the present invention also provides a kind of Set Top Box of Anti-burnout, and described Set Top Box is comprising upper
Any described Anti-burnout circuit stated.
To sum up, the circuit and Set Top Box that the present invention is provided realize that simply, the effect of good Anti-burnout can be reached.
Embodiments of the invention are the foregoing is only, the scope of the claims of the invention is not thereby limited, it is every to utilize this hair
Equivalent structure or equivalent flow conversion that bright specification and accompanying drawing content are made, or directly or indirectly it is used in other related skills
Art field, is included within the scope of the present invention.
Claims (13)
1. a kind of anti-burnout circuit, it is characterised in that：Comprising communication interface and system signal ground, described communication interface is included
Communication interface signal ground, described communication interface signal ground is connected by magnetic bead with system signal, also includes screw hole,
One resistance, the first electric capacity and the first electrical surge suppressor, described screw hole connect one end of the first electric capacity, first resistor
One end and the negative terminal of the first electrical surge suppressor, described system signal ground connect the other end, the first resistor of the first electric capacity
The other end and the first electrical surge suppressor anode.
2. a kind of anti-burnout circuit according to claim 1, it is characterised in that：Described first resistor and the first electric capacity
The frequency of the RC network of composition is 40Hz~60Hz.
3. a kind of anti-burnout circuit according to claim 1, it is characterised in that：The first resistor resistance for megaohm with
On, first electric capacity be high-voltage capacitance, the first electrical surge suppressor it is pressure-resistant for more than 240V.
4. a kind of anti-burnout circuit according to claim 1, it is characterised in that：Also comprising casing ground, second resistance and
Second electric capacity, described casing ground connects one end of one end and the second electric capacity of second resistance, the electricity of system signal ground connection second
The other end of the other end of resistance and the second electric capacity.
5. a kind of anti-burnout circuit according to claim 4, it is characterised in that：Also suppress comprising the second electrical surge
Device, described casing ground is connected with the negative terminal of the second electrical surge suppressor, described communication interface signal ground and the second transient state
The anode connection of surge suppressor.
6. a kind of anti-burnout circuit according to claim 4, it is characterised in that：Described second resistance and the second electric capacity
The frequency of the RC network of composition is 40Hz~60Hz.
7. a kind of anti-burnout circuit described according to claim 5, it is characterised in that：The second resistance resistance is million
It is more than Europe, second electric capacity be high-voltage capacitance, the second electrical surge suppressor it is pressure-resistant for more than 240V.
8. a kind of anti-burnout circuit according to claim 1, it is characterised in that：Also include casing ground, screw hole with
Casing ground, one end of first resistor, one end connection of the first electric capacity, casing ground and the other end of first resistor, the first electric capacity
The other end is connected.
9. a kind of anti-burnout circuit according to claim 8, it is characterised in that：Described first resistor and the first electric capacity
The frequency of the RC network of composition is 40Hz~60Hz.
10. a kind of anti-burnout circuit according to claim 8, it is characterised in that：The first resistor resistance for megaohm
More than, first electric capacity is high-voltage capacitance.
11. according to any described a kind of anti-burnout circuit in claim 1-10, it is characterised in that：Described communication interface
It is without shielded communication interface.
A kind of 12. Set Top Boxes of Anti-burnout, described Set Top Box includes any described Anti-burnout in the claims 1-10
Circuit.
A kind of 13. Set Top Boxes of Anti-burnout, described Set Top Box includes the Anti-burnout circuit described in the claims 11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310747062.4A CN103747305B (en) | 2013-12-30 | 2013-12-30 | A kind of anti-burnout circuit and set-top box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310747062.4A CN103747305B (en) | 2013-12-30 | 2013-12-30 | A kind of anti-burnout circuit and set-top box |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103747305A CN103747305A (en) | 2014-04-23 |
| CN103747305B true CN103747305B (en) | 2017-06-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310747062.4A Active CN103747305B (en) | 2013-12-30 | 2013-12-30 | A kind of anti-burnout circuit and set-top box |
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| Country | Link |
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| CN (1) | CN103747305B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107529022B (en) * | 2016-06-21 | 2021-12-07 | 中兴通讯股份有限公司 | AV interface circuit and method for manufacturing the same |
| CN111586936B (en) * | 2020-05-28 | 2023-04-07 | 歌尔科技有限公司 | Multi-path constant current driving circuit and multi-path constant current driving device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101540683A (en) * | 2008-03-17 | 2009-09-23 | 华为技术有限公司 | Interface circuit and communication equipment |
| CN102096651A (en) * | 2010-12-22 | 2011-06-15 | 深圳市中兴移动通信有限公司 | Mobile phone interface multiplexing circuit based on standard micro USB interface |
| CN102595772A (en) * | 2012-01-19 | 2012-07-18 | 福建星网视易信息系统有限公司 | Method for preventing interface burning-out of equipment with external equipment interface |
| CN202475455U (en) * | 2012-03-02 | 2012-10-03 | 成都飞鱼星科技开发有限公司 | Ethernet interface protection circuit |
| CN202713356U (en) * | 2012-05-21 | 2013-01-30 | 杭州华三通信技术有限公司 | Interface circuit realizing over-voltage and over-current protection and electronic device |
-
2013
- 2013-12-30 CN CN201310747062.4A patent/CN103747305B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101540683A (en) * | 2008-03-17 | 2009-09-23 | 华为技术有限公司 | Interface circuit and communication equipment |
| CN102096651A (en) * | 2010-12-22 | 2011-06-15 | 深圳市中兴移动通信有限公司 | Mobile phone interface multiplexing circuit based on standard micro USB interface |
| CN102595772A (en) * | 2012-01-19 | 2012-07-18 | 福建星网视易信息系统有限公司 | Method for preventing interface burning-out of equipment with external equipment interface |
| CN202475455U (en) * | 2012-03-02 | 2012-10-03 | 成都飞鱼星科技开发有限公司 | Ethernet interface protection circuit |
| CN202713356U (en) * | 2012-05-21 | 2013-01-30 | 杭州华三通信技术有限公司 | Interface circuit realizing over-voltage and over-current protection and electronic device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103747305A (en) | 2014-04-23 |
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