CN201118818Y - Separation device, coaxial cable and video receiving device with ground line separation function - Google Patents
Separation device, coaxial cable and video receiving device with ground line separation function Download PDFInfo
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- CN201118818Y CN201118818Y CNU2007200286292U CN200720028629U CN201118818Y CN 201118818 Y CN201118818 Y CN 201118818Y CN U2007200286292 U CNU2007200286292 U CN U2007200286292U CN 200720028629 U CN200720028629 U CN 200720028629U CN 201118818 Y CN201118818 Y CN 201118818Y
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- 238000000926 separation method Methods 0.000 title 2
- 238000002955 isolation Methods 0.000 claims abstract description 107
- 239000003990 capacitor Substances 0.000 claims abstract description 56
- 239000004020 conductor Substances 0.000 claims abstract description 56
- 230000008878 coupling Effects 0.000 claims description 8
- 238000010168 coupling process Methods 0.000 claims description 8
- 238000005859 coupling reaction Methods 0.000 claims description 8
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- 238000010586 diagram Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
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Abstract
The utility model discloses an isolating device having the earth line isolating function, which comprises a television interface connected with a TV interface of a receiving equipment of a cable television as well as an antenna interface connected with a cable interface of the cable television, and isolating capacitors or isolating transformers are connected between the two interfaces; wherein, the isolating capacitors are respectively connected between inner conductors and between outer cylindrical conductors of the television interface and the antenna interface; when in connection with the isolating transformers, primary coils of the isolating transformers are connected between the inner conductor and the outer cylindrical conductor of the television interface, and secondary coils thereof are connected between the inner conductor and the outer cylindrical conductor of the antenna interface. The utility model meanwhile discloses a coaxial cable having the earth line isolating function and a video receiving equipment which are applied to a wired television system, and the wired television system realizes the earth line isolation through arranging the isolating capacitors or the isolating transformers on the coaxial cable, thereby solving the earth line circulation problem and implementing the safety protection to the cable television receiving equipment.
Description
Technical Field
The utility model belongs to the technical field of the cable TV, specifically speaking relates to a can be applied to cable TV isolating device, coaxial cable and the video receiving equipment that realizes the ground wire and keep apart among the cable TV system.
Background
For the current TV set or set-top box for receiving cable TV signals, a radio frequency signal input port, i.e. a TV interface, is generally provided thereon. The TV interface is connected with the cable TV interface in the user's home through a cable TV cable (i.e. a coaxial cable for transmitting cable TV signals), so that the user can receive the cable TV signals sent by the TV station.
In a cable television system, among a plurality of grounds such as an internal ground of a television device, a transmission signal ground, a commercial power ground and the like, due to the complexity of the system ground, when a voltage difference exists between a cable television signal ground and a 220V commercial power ground, a ground wire circulation current is formed, and the cable television system is harmful to household cable television equipment. At present, when a set-top box is connected with a television, a TV interface of the set-top box is generally used for connecting a cable television cable, and the set-top box is connected with an AV interface of the television through an AV cable, so that a cable television signal is played and output on the television. Thus, the cable television signal ground-the set-top box ground-the AV wire ground-the television AV interface input ground-the power grounding wire-220V commercial power ground constitutes a loop. Ideally, there should be no voltage difference between the cable tv signal ground and the 220V commercial power ground, but due to the complexity of grounding of the two systems in practical use, if there is a voltage difference between the cable tv signal ground and the 220V commercial power ground, a ground loop current will be formed, which causes the weak current tolerance part in the loop to heat up, even burn out, such as a tuner, an AV line, an AV interface, a cable tv cable interface, etc., and damages the household cable tv signal receiving equipment.
At present, the ground wire isolation of each household is not achieved in a wired system, if the wired system is in a problem of grounding, the whole subsystem is electrified, and potential safety hazards are caused to the system and equipment.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a solve among the current cable television system because complicated system ground connection produces the voltage difference to form the problem of ground wire circulation, provided a cable television isolating device, realized cable television system's ground wire isolation, played safety protection's effect to cable television signal receiving equipment.
In order to solve the technical problem, the utility model discloses a following technical scheme realizes:
a cable TV isolating device with ground wire isolating function is composed of TV interface connected to TV interface of cable TV receiver and antenna interface connected to cable TV interface, and isolating capacitor or transformer between said TV interface and antenna interface. When the isolation capacitors are connected, at least two isolation capacitors are included, wherein one isolation capacitor is connected in series between the television interface and the inner conductor of the antenna interface, and the other isolation capacitor is connected in series between the television interface and the outer cylindrical conductor of the antenna interface; when the isolation transformer is connected, the primary coil or the secondary coil of the isolation transformer is connected between the inner conductor and the outer cylindrical conductor of the television interface, and correspondingly, the secondary coil or the primary coil of the isolation transformer is connected between the inner conductor and the outer cylindrical conductor of the antenna interface.
Further, the capacitance value of the isolation capacitor is selected to be between 470 picofarads and 5000 picofarads; the isolation transformer is preferably a high-frequency coupling transformer with the turn ratio of 1: 1.
In order to conveniently plug the cable television isolating device between a TV interface and a cable television cable interface of television receiving equipment, the television interface preferably selects a coaxial cable male connector matched with the television interface according to the type of the TV interface; and the antenna interface selects a coaxial cable female connector (or a coaxial cable male connector) matched with the antenna interface according to the type of the cable television cable interface.
Based on the design principle of the cable television isolating device, the utility model also provides a coaxial cable with the ground wire isolating function applied to a cable television system, namely, a capacitor or a transformer with the isolating function is connected in the coaxial cable; when a capacitance isolation mode is adopted, one isolation capacitor is connected in series between inner conductors of the coaxial cables, and the other isolation capacitor is connected in series between outer cylindrical conductors of the coaxial cables; when the transformer isolation mode is adopted, the primary coil of the isolation transformer is connected between the inner conductor and the outer cylindrical conductor of one section of coaxial cable, and the secondary coil is connected between the inner conductor and the outer cylindrical conductor of the other section of coaxial cable.
Furthermore, the isolation transformer is realized by a high-frequency coupling transformer with the turn ratio of 1: 1.
In addition, the utility model also discloses a video receiving device, including the TV interface that is used for receiving the cable TV signal and the coaxial cable who is connected with the TV interface, in order to realize the purpose of ground wire isolation, be connected with electric capacity or transformer that have the isolation in the coaxial cable; when the isolation is selected through the capacitor, the isolation capacitor at least comprises two capacitors, wherein one capacitor is connected in series between the inner conductors of the coaxial cables, and the other capacitor is connected in series between the outer cylindrical conductors of the coaxial cables; when the isolation is carried out through the transformer, the primary coil of the isolation transformer is connected between the inner conductor and the outer cylindrical conductor of one section of the coaxial cable, and the secondary coil of the isolation transformer is connected between the inner conductor and the outer cylindrical conductor of the other section of the coaxial cable.
Similarly, the capacitance value of the isolation capacitor is selected to be between 470 picofarads and 5000 picofarads; the isolation transformer is preferably realized by selecting a high-frequency coupling transformer with the turn ratio of 1: 1.
Preferably, the video receiving device is a television or a set-top box.
Compared with the prior art, the utility model discloses an advantage is with positive effect: adopt the utility model discloses a cable television isolating device or coaxial cable for cable digital television system has realized the ground wire and has kept apart, has solved the ground wire circulation problem that the voltage difference that arouses because of the complexity of numerous ground connection system ground connection formed, has played certain safety protection effect to domestic cable television receiving equipment such as TV set, STB, has improved cable television receiving equipment's usability and security.
Drawings
Fig. 1 is a schematic diagram of a capacitive isolation manner of the cable tv isolation apparatus according to the present invention;
fig. 2 is a schematic diagram of a transformer isolation method of the cable tv isolation apparatus according to the present invention;
FIG. 3 is a schematic diagram of the connection between a television and a cable television cable using a cable television isolation device using capacitive isolation;
FIG. 4 is a schematic diagram of a coaxial cable structure with an isolation capacitor connected thereto;
fig. 5 is a schematic view of a coaxial cable structure with an isolation transformer connected thereto.
Detailed Description
The following describes in detail embodiments of the present invention with reference to the drawings.
The utility model discloses a cable television isolating device is considered from the convenient angle of pegging graft, is provided with the TV interface that can be connected with cable television receiving arrangement's TV interface and the antenna interface that can be connected with cable television cable interface. Considering that the TV interface of the existing cable television receiving device, such as a cable digital television or a set-top box, generally adopts the form of a coaxial cable female connector (i.e. an interface in which an inner conductor at the central position inside an outer cylindrical conductor is a jack), the TV interface of the cable television isolating device is designed as a coaxial cable male connector so as to be conveniently plugged with the TV interface. Similarly, considering that the interface connected to the cable is generally in the form of a coaxial cable male connector, the antenna interface of the cable isolation device is designed in the form of a coaxial cable female connector to facilitate the connection therewith. Of course, the TV interface and the antenna interface may also select other types of connectors corresponding to the TV interface and the cable TV cable interface according to their specific types, which is not limited by the present invention.
In order to achieve the ground isolation of the cable television system, an isolation element, such as an isolation capacitor or an isolation transformer, needs to be connected between the television interface and the antenna interface. Referring to fig. 1 and 2, when the isolation capacitor connection form is adopted, the isolation capacitor should include at least two capacitors, such as C1 and C2, the capacitor C1 is connected in series between the inner conductors of the tv interface JP1 and the antenna interface JP2, and the capacitor C2 is connected in series between the outer cylindrical conductors of the tv interface JP1 and the antenna interface JP2, which is specifically described in this embodiment by taking the tv interface JP1 as a coaxial cable male connector form and the antenna interface JP2 as a coaxial cable female connector form as an example. When the isolation transformer connection mode is adopted, the primary coil T-1 (or the secondary coil T-2) of the isolation transformer T is connected between the inner conductor and the outer cylindrical conductor of the television interface JP1, and the secondary coil T-2 (or the primary coil T-1) of the isolation transformer T is connected between the inner conductor and the outer cylindrical conductor of the antenna interface JP 2.
The isolation capacitors C1 and C2 generally need to have a more significant effect than 470 picofarads, but to achieve a better effect, capacitors of thousands of picofarads are preferably selected, such as 2000 picofarads, 2500 picofarads, 3000 picofarads, and the like, and generally not more than 5000 picofarads. Of course, other equivalent devices to the isolation capacitors C1 and C2 are also possible, such as a plurality of capacitors connected in series to be equivalent to one capacitor as described above. When the isolation transformer T is adopted to realize ground wire isolation, the cost of the isolation transformer T is higher than that of a capacitor, the packaging is larger, and generally a high-frequency coupling transformer with the ratio of 1: 1 needs to be selected to realize better effect.
Fig. 3 is a schematic diagram of the connection between the tv and the cable tv cable of the cable tv isolation apparatus using the capacitive isolation method. In the figure, a television interface JP1 is inserted into a TV interface on the back of a digital television, and some televisions are marked with a word of "antenna" on the interface; then the cable interface of the cable television is inserted into the antenna interface JP2 of the isolating device, and the purpose of isolating the ground wire of the cable television system can be realized by utilizing the isolating action of the capacitors C1 and C2, so that the generation of ground wire circulation is avoided, and the effect of safety protection on the television is achieved.
For those televisions connected with the cable television cable through the digital set-top box, the antenna interface JP2 of the cable television isolating device is plugged with the cable television cable interface, and the television interface JP1 of the cable television isolating device is inserted into a TV interface on the back of the digital set-top box; then, the AV port of the digital set-top box is connected with the AV1 or AV2 interface of the television through an AV cable, so that the display and play of the cable television signals in the television can be realized, and the problem of ground circulation of a cable television system is solved.
Based on above-mentioned cable television isolating device's design principle, the utility model provides a be applied to in the cable television system again, coaxial cable with ground wire isolation function connects above-mentioned electric capacity or the transformer that has the isolation promptly in the coaxial cable of transmission cable television signal. Referring to fig. 4 and 5, when the capacitor is used for ground isolation, first, the isolation capacitor C3 is connected in series between the inner conductors of the coaxial cables; then, the isolation capacitor C4 is connected in series between the outer cylindrical conductors of the coaxial cables; the coaxial cable is connected with a cable television receiving device, and the ground wire isolation task of a complex cable television system can be completed by utilizing the isolation action of the capacitors C3 and C4. When the transformer is used for ground wire isolation, firstly, a primary coil T '-1 of an isolation transformer T' is connected between an inner conductor and an outer cylindrical conductor of one section of coaxial cable; secondly, connecting a secondary coil T '-2 of the isolation transformer T' between an inner conductor and an outer cylindrical conductor of another section of coaxial cable; then, the coaxial cable is connected to the cable television receiving device, and the ground wire isolation purpose of the cable television system can be achieved by utilizing the isolation function of the transformer T'.
Similarly, the capacitance values of the isolation capacitors C3 and C4 are preferably selected to be between 470 picofarads and 5000 picofarads; the isolation transformer T' preferably selects a high-frequency coupling transformer with the turn ratio of 1: 1 to achieve better isolation effect.
In addition, the utility model provides a video receiving equipment with ground wire isolation function still, set up promptly on the coaxial cable of video receiving equipment internal connection TV interface isolation electric capacity or isolation transformer, its connected mode of keeping apart electric capacity and isolation transformer is shown with figure 4, figure 5, the utility model discloses not giving unnecessary details here. The video receiving device may be an electronic device such as a digital set-top box or a digital television set, which can receive cable television signals.
Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and the changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also belong to the protection scope of the present invention.
Claims (10)
1. An isolating device with a ground wire isolating function is characterized in that: the cable television receiving device comprises a television interface connected with a TV interface of the cable television receiving device and an antenna interface connected with a cable interface of the cable television, wherein an isolation capacitor or an isolation transformer is connected between the television interface and the antenna interface;
when the isolation capacitors are connected, at least two isolation capacitors are included, wherein one isolation capacitor is connected in series between the television interface and the inner conductor of the antenna interface, and the other isolation capacitor is connected in series between the television interface and the outer cylindrical conductor of the antenna interface;
when the isolation transformer is connected, a primary coil or a secondary coil of the isolation transformer is connected between an inner conductor and an outer cylindrical conductor of the television interface; correspondingly, the secondary coil or the primary coil of the isolation transformer is connected between the inner conductor and the outer cylindrical conductor of the antenna interface.
2. The isolation device of claim 1, wherein: the capacitance value of the isolation capacitor is larger than 470 picofarads and smaller than 5000 picofarads.
3. The isolation device of claim 1, wherein: the isolation transformer is a high-frequency coupling transformer with the turn ratio of 1: 1.
4. An isolation device as claimed in claim 1, 2 or 3, wherein: the television interface is a coaxial cable male connector; the antenna interface is a coaxial cable female joint.
5. A coaxial cable with ground wire isolation function, its characterized in that: an isolation capacitor or an isolation transformer with an isolation function is connected in the coaxial cable; wherein,
when the isolation capacitors are connected, the isolation capacitors at least comprise two capacitors, one capacitor is connected in series between the inner conductors of the coaxial cables, and the other capacitor is connected in series between the outer cylindrical conductors of the coaxial cables;
when the isolation transformer is connected, a primary coil of the isolation transformer is connected between the inner conductor and the outer cylindrical conductor of one section of coaxial cable, and a secondary coil of the isolation transformer is connected between the inner conductor and the outer cylindrical conductor of the other section of coaxial cable.
6. The coaxial cable of claim 5, wherein: the isolation transformer is a high-frequency coupling transformer with the turn ratio of 1: 1.
7. A video receiving apparatus comprising a TV interface for receiving cable television signals and a coaxial cable connected to said TV interface, characterized by: an isolation capacitor or an isolation transformer with an isolation function is connected in the coaxial cable; wherein,
when the isolation capacitors are connected, the isolation capacitors at least comprise two capacitors, one capacitor is connected in series between the inner conductors of the coaxial cables, and the other capacitor is connected in series between the outer cylindrical conductors of the coaxial cables;
when the isolation transformer is connected, a primary coil of the isolation transformer is connected between the inner conductor and the outer cylindrical conductor of one section of coaxial cable, and a secondary coil of the isolation transformer is connected between the inner conductor and the outer cylindrical conductor of the other section of coaxial cable.
8. The video receiving apparatus according to claim 7, wherein: the capacitance value of the isolation capacitor is larger than 470 picofarads and smaller than 5000 picofarads.
9. The video receiving apparatus according to claim 7, wherein: the isolation transformer is a high-frequency coupling transformer with the turn ratio of 1: 1.
10. The video receiving apparatus according to claim 7, 8 or 9, wherein: the video receiving device is a television or a set top box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200286292U CN201118818Y (en) | 2007-09-28 | 2007-09-28 | Separation device, coaxial cable and video receiving device with ground line separation function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200286292U CN201118818Y (en) | 2007-09-28 | 2007-09-28 | Separation device, coaxial cable and video receiving device with ground line separation function |
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| Publication Number | Publication Date |
|---|---|
| CN201118818Y true CN201118818Y (en) | 2008-09-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200286292U Expired - Fee Related CN201118818Y (en) | 2007-09-28 | 2007-09-28 | Separation device, coaxial cable and video receiving device with ground line separation function |
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| CN (1) | CN201118818Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108072776A (en) * | 2016-11-14 | 2018-05-25 | 旺矽科技股份有限公司 | Probe card and multi-signal transmission board thereof |
-
2007
- 2007-09-28 CN CNU2007200286292U patent/CN201118818Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108072776A (en) * | 2016-11-14 | 2018-05-25 | 旺矽科技股份有限公司 | Probe card and multi-signal transmission board thereof |
| CN108072776B (en) * | 2016-11-14 | 2020-05-26 | 旺矽科技股份有限公司 | Probe card and its multiple signal transmission board |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080917 Termination date: 20110928 |