CN201365304Y

CN201365304Y - Isolating tuner

Info

Publication number: CN201365304Y
Application number: CNU2009201354224U
Authority: CN
Inventors: 黄凯华; 杨红兵
Original assignee: Shenzhen TCL New Technology Co Ltd
Current assignee: Shenzhen TCL New Technology Co Ltd
Priority date: 2009-03-06
Filing date: 2009-03-06
Publication date: 2009-12-16
Anticipated expiration: 2019-03-06

Abstract

The utility model is applicable to the technical field of televisions and provides an isolating tuner which comprises a tuner; the isolating tuner also comprises a ring-shaped noninductive capacitor; a ring-shaped electrode at one side of the ring-shaped noninductive capacitor is connected with a ground wire of an input signal and a ring-shaped electrode at the other side thereof is connected with a ground wire in a television. The isolating tuner achieves the isolation of the ground wire in the television from the ground wire of the input signal, and effectively avoids signal reflection which is caused by transmission impedance mismatch as an ordinary capacitor is adopted for manufacturing an isolator, thereby improving the signal transmission efficiency and the signal transmission quality, and more importantly, eliminating potential safety hazards caused by non-isolation of the ground wires in the system. In addition, the isolating tuner has the advantages of simple structure, easy achievement and lower cost compared with that an isolator is further arranged outside the tuner.

Description

A kind of isolation tuner

Technical field

The utility model belongs to TV technology, relates in particular to a kind of isolation tuner.

Background technology

At present, the owning rate of television set is very high in the world, some security incidents in use also occur, and for example, annual all have television set on fire and cause the accident of economic loss to take place to the user, in some cases even cause user's casualties.Wherein when television set is class protection mode; because there are unbalanced possibility in the protective earthing line of user's television set electric power system and the ground connection of cable TV signal network; and now a lot of cable TV signal house lead in boxes are not installed the ground wire isolation; make that television signal input plug (aerial plug) is directly to link to each other with the ground of signal source (cable television network); inserting behind the television set just, the protective earthing with electric power system has been connected in; this can cause bigger electric current to circulate between these two earth connections; cause that lead is overheated, and then initiation fire.This accident has had generation at home, has caused very big infringement for user's lives and properties.

In view of this situation, relevant standard is being prepared to issue by the relative national standards committee, will isolate the ground wire of wired television receiver and the ground wire of tuner signal input, as the requirement of mandatory safety standard.

At present, have the part television set to make factory and use common lead capacitance as isolator, its structure is also unreasonable, because of its distributed inductance is very big, can cause impedance mismatching serious, and the damage that signal is subjected to is big.And this isolator can cause the complex structure of input, difficult processing, and cost height, waste of material are many.

Therefore, need a kind of isolation tuner, its ground wire and television set ground wire isolation effect are better, with practical requirement.

The utility model content

The purpose of this utility model is to provide a kind of isolation tuner, is intended to solve the problem of tuner ground wire and the isolation of television set ground wire.

The utility model is to realize like this, a kind of isolation tuner, comprise tuner, described isolation tuner also comprises annular noninductive capacitor, the annular electrode of described annular noninductive capacitor one side connects the ground wire of described tuner signal input, and the annular electrode of another side connects the ground wire of television set inside.

Be provided with crimping bullet pad between the annular electrode of described annular noninductive capacitor one side and the ground wire of signal input part.

Described crimping bullet pad is provided with salient point.

The ground wire of described signal input part cooperates by clamp nut and fixed pedestal, and the crimping bullet of clamping pad on described annular noninductive capacitor annular electrode pads the contacting of annular electrode of existing and described annular noninductive capacitor.

Described fixed pedestal is made by insulating material, is riveted on the radome of described tuner.

The ground wire of described television set inside links to each other with described radome.

Be provided with crimping bullet pad between the ground wire of the annular electrode of described annular noninductive capacitor another side and television set inside.

The utility model overcomes the deficiencies in the prior art, a kind of isolation tuner is provided, the ground wire of the signal input port of television set tuner and the ground wire of television set inside are disconnected, the signal coupling is carried out with annular noninductive capacitor in the centre, realized the isolation of television set ground wire and input signal earth connection, avoided adopting ordinary capacitor to make isolator and transfer impedance mismatch that causes and then the signal reflex that causes effectively, thereby raising effectiveness, improve signal transmission quality, the more important thing is that it has eliminated owing to ground wire between said system is not isolated the potential safety hazard that causes; In addition, the isolation tuner architecture that the utility model provides is simple, is easy to realize, and is cheaper than doing the isolator cost in addition in the tuner outside.

Description of drawings

Fig. 1 is the structural representation of the isolation tuner signal input that provides of the utility model embodiment;

The isolation tuner signal input assembling explosive view that Fig. 2 the utility model embodiment provides.

Embodiment

In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.

As shown in Figures 1 and 2, what show among the figure is the signal input terminal of the isolation tuner that provides of the utility model embodiment, and it comprises the core utmost point 101, terminal earth electrode 102, annular noninductive capacitor 103, crimping bullet pad 104, core utmost point fixed cover 105, hold-down nut 106 and fixed pedestal 107 etc.Wherein,

The core utmost point 101 is fixed in the fixed pedestal 107 by the core utmost point fixed cover 105 that insulate, and its outside end connects cable TV signal, and an inside end connects RF (radio frequency) input of tuner.

Terminal earth electrode 102, be used to connect the earth connection of input signal, be outer threaded metallic conduction barrel on the structure, can be embedded in clamp nut 106 in the fixed pedestal 107, two crimping bullet pads 104 and the annular noninductive capacitor 103 that is clipped in are wherein compressed by screw-in.Wherein, the crimping bullet pad 104 of annular noninductive electric capacity 103 both sides contacts in order to two electrode retaining collars improving annular noninductive capacitor 103 and inside and outside earth electrode, is manufactured with equally distributed several projections on crimping bullet pad 104 for this reason.

Fixed pedestal 107 is made by insulating material, is riveted on the radome 108 on the tuner, is used for fixing above-mentioned parts to form the tuner with isolation features of an integral body.

Following signal path explanation buffer action below.

The core utmost point 101 is externally connected to line TV signal heart yearn, internal interface tuner RF input, a utmost point of connection signal.After inserting outer signal (cable TV signal) line, outer signal ground will link to each other with terminal earth electrode 102, terminal earth electrode 102 is by the crimping bullet pad 104 of conduction, be connected on the annular electrode of annular noninductive electric capacity 103, the annular electrode of annular noninductive electric capacity 103 another sides is connected on the interior ground connection (earth electrode of television set) that links to each other with tuner radome 108 by the crimping bullet pad 104 of another conduction again.So the inner ground wire of the ground wire of cable TV signal and television set is linked up by the coupling of the noninductive electric capacity 103 of annular.

So far, a complete signal circuit is realized.It is pointed out that in the present embodiment the ground wire of cable TV signal is not directly to be connected with the ground wire of television set inside, but realize signals by annular noninductive electric capacity 103 couplings.In other words, the annular noninductive electric capacity 103 in the present embodiment had both played the effect of signal communication between two systems, played the effect of isolating two systems again.

These devices are fixed in the fixed pedestal of being made by insulating material 107, as shown in Figure 1.Tuner radome 108 among Fig. 1 links to each other with the ground wire of television receiver.On the signal ground path, the ground connection of cable TV signal and the ground connection of television receiver are kept apart by the noninductive electric capacity 103 of annular like this, and realize the signal coupling by the noninductive electric capacity 103 of annular.

Crimping bullet pad 104 is provided with projection, in order to improve the even contact on circumferential direction.

In the technical scheme that the utility model provides, because the coupling of signal realizes that by annular capacitor its impedance matching is than reaching better effect with common electric capacity cross-over connection.In addition, because spacer assembly directly is integrated on the signal input terminal of tuner, its compact conformation simply, has further been optimized the coupling of signal, has reduced the interference of signal reflex, decay and introducing.

The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.

Claims

1, a kind of isolation tuner, comprise tuner, it is characterized in that described isolation tuner also comprises annular noninductive capacitor, the annular electrode of described annular noninductive capacitor one side connects the ground wire of described tuner signal input, and the annular electrode of another side connects the ground wire of television set inside.

2, isolation tuner according to claim 1 is characterized in that, is provided with crimping bullet pad between the annular electrode of described annular noninductive capacitor one side and the ground wire of signal input part.

3, isolation tuner according to claim 2 is characterized in that, described crimping bullet pad is provided with salient point.

4, isolation tuner according to claim 2, it is characterized in that, the ground wire of described signal input part cooperates by clamp nut and fixed pedestal, and the crimping bullet of clamping pad on described annular noninductive capacitor annular electrode pads the contacting of annular electrode of existing and described annular noninductive capacitor.

5, isolation tuner according to claim 4 is characterized in that, described fixed pedestal is made by insulating material, is riveted on the radome of described tuner.

6, isolation tuner according to claim 4 is characterized in that, the ground wire of described television set inside links to each other with described radome.

7, isolation tuner according to claim 1 is characterized in that, is provided with crimping bullet pad between the ground wire of the annular electrode of described annular noninductive capacitor another side and television set inside.