CN201142718Y - Feeder line isolating circuit - Google Patents
Feeder line isolating circuit Download PDFInfo
- Publication number
- CN201142718Y CN201142718Y CNU2007201961590U CN200720196159U CN201142718Y CN 201142718 Y CN201142718 Y CN 201142718Y CN U2007201961590 U CNU2007201961590 U CN U2007201961590U CN 200720196159 U CN200720196159 U CN 200720196159U CN 201142718 Y CN201142718 Y CN 201142718Y
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- CN
- China
- Prior art keywords
- feeder line
- resistance
- buffer circuit
- electric capacity
- line buffer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000002955 isolation Methods 0.000 claims description 7
- 239000011521 glass Substances 0.000 claims description 4
- 239000003990 capacitor Substances 0.000 abstract description 7
- 230000035939 shock Effects 0.000 abstract description 4
- 230000002159 abnormal effect Effects 0.000 abstract description 2
- 238000009413 insulation Methods 0.000 description 5
- 230000000977 initiatory effect Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 208000033999 Device damage Diseases 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model provides a feeder isolating circuit which is used for a television with a feeder and a high radio-frequency head. The feeder isolating circuit is arranged between the feeder and the high radio-frequency head and comprises a first capacitor and a second capacitor. The capacitors are Y-type safety capacitors with capacitance between 220 miicromicro farad and 2200 miicromicro farad. The first capacitor is connected between the core wire of the feeder and the core wire of the high radio-frequency head in series. The second capacitor is connected between the shielding layer of the feeder and the ground wire of the high radio-frequency head in series. With the above technical proposal, the feeder isolating circuit prevents human bodies from fire or shock hazard caused by abnormal electrification of a cable television system, and protects the safety of a user and eliminates fire hazard.
Description
Technical field
The utility model includes the unusual protection when charged of cable TV system, in particular, and a kind of feeder line buffer circuit.
Background technology
At present, the cable TV receiving equipment as television set, set-top box etc., and between the cable television system, directly links to each other by coaxial cable, and the ground wire and the cable shield of tuner (tuner) directly are communicated with, and heart yearn is also corresponding directly to be communicated with middle no quarantine measures.The following two kinds of situations of general employing realize.A kind of situation is: the existing device ground protection is good, as adopts three core power lines and ground connection good.Another kind of situation is: existing device does not have ground protection, as adopts two core power lines.
When the existing device ground protection good; and the cable of cable television system is unusual when charged; big electric current flows into protection ground through antenna terminal and tuner, ground wire etc.; because the antenna terminal place may cause contact resistance to increase because of loosening, oxidation; thereby cause heating; and the formation vicious circle, of long duration promptly have the danger that causes fire.
When existing device does not have ground protection; and the cable of cable television system is unusual when charged, and receiving equipment is because direct annexation and charged, touch because of carelessness equipment expose metal part such as terminal after; as side AV etc., may jeopardize user's personal safety.
To sum up, cause shock hazard when cable television system abnormal belt easy initiation fire of when electricity or to human body.Therefore, there is defective in prior art, needs to improve.
The utility model content
Technical problem to be solved in the utility model is to prevent the unusual easy initiation fire or human body caused shock hazard when charged of cable television system.
The technical solution of the utility model is as follows:
A kind of feeder line buffer circuit is used to have the television set of feeder line and tuner, and wherein, described feeder line buffer circuit is arranged between described feeder line and the described tuner, and it comprises first electric capacity and second electric capacity; Described electric capacity is Y type safety electric capacity, and its capacity is 220 pico farad to 2200 pico farads; Described first capacitances in series is between the heart yearn of the heart yearn of described feeder line and described tuner; Described second capacitances in series is between the ground wire of the screen of described feeder line and described tuner.
Described feeder line buffer circuit, wherein, described feeder line buffer circuit also comprises first resistance, it is in parallel with described second electric capacity, and is connected between the ground wire of the screen of described feeder line and described tuner; The resistance of described first resistance is that 4.7 megaohm to 20 megaohms, power are more than or equal to 1 watt, withstand voltage more than or equal to 3000 volts.
Described feeder line buffer circuit, wherein, the resistance of described first resistance is that 8.2 megaohm to 20 megaohms, power are 1 watt to 3 watts.
Described feeder line buffer circuit, wherein, described first resistance is high withstand voltage glass glaze resistance.
Described feeder line buffer circuit wherein, adopts at least two resistance to be composed in series described first resistance.
Described feeder line buffer circuit wherein, is formed each resistance of described first resistance, and the resistance after the series connection is that 4.7 megaohm to 20 megaohms, power are more than or equal to 1 watt, withstand voltage more than or equal to 3000 volts.
Described feeder line buffer circuit, wherein, described electric capacity is isolation capacitance, is used to isolate unusual alternating current.
Described feeder line buffer circuit, wherein, described electric capacity is that withstand voltage is the Y1 type safety electric capacity of 2600V.
Described feeder line buffer circuit, wherein, described electric capacity is that withstand voltage is the Y2 type safety electric capacity of 4700V.
Described feeder line buffer circuit, wherein, the distance between each element is set to be not less than the creepage distance that calculates according to safety.
Adopt such scheme, the utility model to prevent that cable television system is unusual when charged, easily initiation fire or human body caused shock hazard; Protect user security, and eliminated disaster hidden-trouble.
Description of drawings
Fig. 1 is a circuit diagram of the present utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is elaborated.
The utility model is applied in the cable TV receiving equipment, as television set, set-top box or the like; Electrical isolation system as tuner (being tuner) inlet.As shown in Figure 1, the utility model provides a kind of feeder line buffer circuit, is used to have the television set of feeder line and tuner, and described feeder line buffer circuit is arranged between described feeder line and the described tuner.
An example is that described feeder line buffer circuit comprises first electric capacity and second electric capacity; Wherein, described electric capacity is Y type safety electric capacity, and for example, described electric capacity is that withstand voltage is the Y1 type safety electric capacity of 2600V, and perhaps described electric capacity is that withstand voltage is the Y2 type safety electric capacity of 4700V.The capacity of first electric capacity and second electric capacity is that 220pF (pico farad) is to 2200 pico farads; The capacity of two electric capacity can be identical also can be inequality; Rated voltage is 250V or 400V, decides on actual conditions.Described electric capacity is generally isolation capacitance, is used to isolate unusual alternating current.
In specifically being provided with, described first capacitances in series is between the heart yearn of the heart yearn of described feeder line and described tuner; Described second capacitances in series is between the ground wire of the screen of described feeder line and described tuner.
Be more preferably, described feeder line buffer circuit also comprises first resistance, and it is in parallel with described second electric capacity, and is connected between the ground wire of the screen of described feeder line and described tuner; The resistance of described first resistance is that 4.7 megaohm to 20 megaohms, power are more than or equal to 1 watt, withstand voltage more than or equal to 3000 volts.Described first resistance can be for the withstand voltage glass glaze resistance of height, and is promptly withstand voltage more than or equal to 3000 volts.
For example, the resistance of described first resistance is that 8.2 megaohm to 20 megaohms, power are 1 watt to 3 watts.An example is: the resistance of described first resistance is 8.2 megaohms, and power is 1.5 watts, and withstand voltage is 4000 volts.
Can also adopt at least two low resistance, low-power, low withstand voltage resistance to be composed in series described first resistance.For example, form two or three even more resistance of described first resistance, the resistance after the series connection is that 4.7 megaohm to 20 megaohms, power are more than or equal to 1 watt, withstand voltage more than or equal to 3000 volts.
And in the described feeder line buffer circuit, the distance between each element is set to be not less than the creepage distance that calculates according to safety.Creepage distance is promptly between two conductive parts that record along insulating surface or the shortest path between conductive parts and the equipment protection interface.For example, determine that the creepage distance step can comprise: effective value or the D. C. value of determining operating voltage; Determine material group; Determine the class of pollution; Determine type of insulation, as functional insulation, basic insulation, supplementary insulation, reinforced insulation etc.
As shown in Figure 1, enumerating a complete example below again carries out the utility model is described.
The utility model mainly is two isolation capacitance C1 of serial connection and C2 between tuner and antenna (feeder line) cable, and a resistance R 1, plays safe isolation, fire prevention, anti-electric shock purpose.
1, C1 is connected between the heart yearn of cable TV feeder line input heart yearn and tuner; After C2 and the R1 parallel connection, be connected between the ground wire (shell) of cable TV feeder shield layer (copper mesh) and tuner.
2, the span of C1 and C2: capacity is between 220pF-2200pF; Rated voltage is 250V or 400V, and specification is Y1 or Y2 electric capacity.
3, C1, C2 are isolation capacitances, have high pass characteristic, can isolate the unusual alternating current in the wired system, as power frequency or its harmonic wave etc., can guarantee that again normal signal (high-frequency signal) is unblocked simultaneously.
4, the span of R1: resistance is between 4.7M Ω (megaohm)-20M Ω (megaohm), power is between 1W-3W, specification is a high withstand voltage glass glaze resistance (withstand voltage greater than 3000V), also available other withstand voltage low, lower powered resistance are in series, total requirement of withstand voltage is greater than 3000V, and total resistance value requires between 4.7M Ω (megaohm)-20M Ω (megaohm).
5, the effect of R1 is to prevent that static from forming accumulation and causing device or device damage on capacitor C 1, C2, belongs to choosing dress device, has had at general occasion or equipment under the situation of electrostatic defending not adorn.
6, should notice that when system's practical application the distance of each arrangement of elements satisfies the requirement of creepage distance in the relevant safety requirements.
Should be understood that, for those of ordinary skills, can be improved according to the above description or conversion, and all these improvement and conversion all should belong to the protection range of the utility model claims.
Claims (10)
1, a kind of feeder line buffer circuit is used to have the television set of feeder line and tuner, it is characterized in that described feeder line buffer circuit is arranged between described feeder line and the described tuner, and it comprises first electric capacity and second electric capacity;
Described electric capacity is Y type safety electric capacity, and its capacity is 220 pico farad to 2200 pico farads;
Described first capacitances in series is between the heart yearn of the heart yearn of described feeder line and described tuner;
Described second capacitances in series is between the ground wire of the screen of described feeder line and described tuner.
2, feeder line buffer circuit according to claim 1 is characterized in that, described feeder line buffer circuit also comprises first resistance, and it is in parallel with described second electric capacity, and is connected between the ground wire of the screen of described feeder line and described tuner;
The resistance of described first resistance is that 4.7 megaohm to 20 megaohms, power are more than or equal to 1 watt, withstand voltage more than or equal to 3000 volts.
3, feeder line buffer circuit according to claim 2 is characterized in that, the resistance of described first resistance is that 8.2 megaohm to 20 megaohms, power are 1 watt to 3 watts.
4, feeder line buffer circuit according to claim 2 is characterized in that, described first resistance is high withstand voltage glass glaze resistance.
5, feeder line buffer circuit according to claim 2 is characterized in that, adopts at least two resistance to be composed in series described first resistance.
6, feeder line buffer circuit according to claim 5 is characterized in that, forms each resistance of described first resistance, and the resistance after the series connection is that 4.7 megaohm to 20 megaohms, power are more than or equal to 1 watt, withstand voltage more than or equal to 3000 volts.
7, feeder line buffer circuit according to claim 1 is characterized in that, described electric capacity is isolation capacitance, is used to isolate unusual alternating current.
8, feeder line buffer circuit according to claim 1 is characterized in that, described electric capacity is that withstand voltage is the Y1 type safety electric capacity of 2600V.
9, feeder line buffer circuit according to claim 1 is characterized in that, described electric capacity is that withstand voltage is the Y2 type safety electric capacity of 4700V.
10, according to the arbitrary described feeder line buffer circuit of claim 1 to 9, it is characterized in that the distance between each element is set to be not less than the creepage distance that calculates according to safety.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201961590U CN201142718Y (en) | 2007-12-21 | 2007-12-21 | Feeder line isolating circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201961590U CN201142718Y (en) | 2007-12-21 | 2007-12-21 | Feeder line isolating circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201142718Y true CN201142718Y (en) | 2008-10-29 |
Family
ID=40070426
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201961590U Expired - Fee Related CN201142718Y (en) | 2007-12-21 | 2007-12-21 | Feeder line isolating circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201142718Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103237183A (en) * | 2012-11-22 | 2013-08-07 | 李明锁 | Television with antenna isolator |
| CN103248857A (en) * | 2012-11-22 | 2013-08-14 | 李明锁 | Antenna isolator |
| CN103716563A (en) * | 2012-10-04 | 2014-04-09 | Lg伊诺特有限公司 | Broadcasting receiving device |
| CN113555674A (en) * | 2020-04-24 | 2021-10-26 | 深圳市万普拉斯科技有限公司 | Antenna device and mobile terminal |
-
2007
- 2007-12-21 CN CNU2007201961590U patent/CN201142718Y/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103716563A (en) * | 2012-10-04 | 2014-04-09 | Lg伊诺特有限公司 | Broadcasting receiving device |
| CN103237183A (en) * | 2012-11-22 | 2013-08-07 | 李明锁 | Television with antenna isolator |
| CN103248857A (en) * | 2012-11-22 | 2013-08-14 | 李明锁 | Antenna isolator |
| CN103237183B (en) * | 2012-11-22 | 2015-10-28 | 江苏华兴电子有限公司 | There is the television set of antenna isolator |
| CN106210595A (en) * | 2012-11-22 | 2016-12-07 | 江苏华兴电子有限公司 | For guaranteeing the antenna isolator of high-frequency signal transmission quality |
| CN106210595B (en) * | 2012-11-22 | 2018-12-07 | 江苏华兴电子有限公司 | For ensuring the antenna isolator of high-frequency signal transmission quality |
| CN113555674A (en) * | 2020-04-24 | 2021-10-26 | 深圳市万普拉斯科技有限公司 | Antenna device and mobile terminal |
| CN113555674B (en) * | 2020-04-24 | 2023-03-17 | 深圳市万普拉斯科技有限公司 | Antenna device and mobile terminal |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Boluo Konka Exactitude Science Technology Co., Ltd. Assignor: Konka Group Co., Ltd. Contract record no.: 2010440001132 Denomination of utility model: Feeder line isolating circuit Granted publication date: 20081029 License type: Exclusive License Record date: 20100812 |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081029 Termination date: 20121221 |
|
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Boluo Konka Exactitude Science Technology Co., Ltd. Assignor: Konka Group Co., Ltd. Contract record no.: 2010440001132 Denomination of utility model: Feeder line isolating circuit Granted publication date: 20081029 License type: Exclusive License Record date: 20100812 |
|
| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model |