CN207166632U - A kind of antenna isolated location and isolation tune two-in-one die set - Google Patents
A kind of antenna isolated location and isolation tune two-in-one die set Download PDFInfo
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- CN207166632U CN207166632U CN201721196488.5U CN201721196488U CN207166632U CN 207166632 U CN207166632 U CN 207166632U CN 201721196488 U CN201721196488 U CN 201721196488U CN 207166632 U CN207166632 U CN 207166632U
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- isolation
- input
- ground
- signal
- electric capacity
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Abstract
The utility model provides a kind of antenna isolated location and isolation tunes two-in-one die set, including two groups of input and output and radio frequency input and output, ground connection isolation capacitance is provided between every group of input ground end and output ground terminal, signal isolation electric capacity is provided between rf inputs and RF output end；It is characterized in that：Before ground connection isolation capacitance and signal isolation electric capacity, increase a direct current absorption circuit；The direct current absorption circuit includes direct current absorption circuit component；Described direct current absorption circuit component one end is connected between ground connection isolation capacitance corresponding to input ground end and the input ground, and the other end is connected between rf inputs and the signal isolation electric capacity.It is greatly improved the tolerance for isolating tuning module to coming from the high-voltage dc signal of outer, coaxial cable signal cored wire, it is born the voltge surge of remote super signal isolation electric capacity pressure voltage, improve the set top box of module and built-in module, television set it is safe to use.
Description
Technical field
It the utility model is related to a kind of antenna isolated location and isolation tune two-in-one die set, more particularly to one kind
The antenna isolated location in television signal transmission field and isolation tune two-in-one die set.
Background technology
In simulation and digital television signal transmitting procedure, to improve transmission quality and efficiency of transmission, the quilt of different programs
Transmission signal needs to be modulated on different channel with certain modulation system, carries out broadcast type biography in a wired or wireless manner
It is defeated, in user terminal receiver, then the carrier channel corresponding to the program that needs are received, filtered by amplification, frequency conversion, frequency-selecting
Ripple, other channel carrier frequencies are filtered out, corresponding channel carrier signal is transformed to the frequency specified, and to the assigned frequency（It is probably
Intermediate frequency, Low Medium Frequency or zero intermediate frequency）It is demodulated, to be reduced into the signal modulated, such as the TS streams of digital television program or simulation
PAL, NTSC or SECAM signal of TV.In the process, amplification, frequency conversion, frequency-selective filtering function are integrated in a radio frequency mould
Realized in group, the radio frequency module is commonly referred to as high-frequency electronic tuner, abbreviation tuner.
Tuner is the key part and component of television set, set top box, and its performance directly determines the signal of television set, set top box
The key indexs such as the quality of reception, sensitivity, anti-interference.
The composition of tuner includes：Signal transfer connector（IEC, RCA, F head）, metallic shield（Metal enclosure frame, metal cover
Son）And PCBA（PCB, electronic component, row's pin）Three parts, PCBA is by rivet welding in metallic shield, and transfer connector is by riveting
Connect and be fixed on metallic shield side, its signal input pin is welded on PCBA, is combined into an overall module.Due to not
Same joint form, metallic shield appearance and size and different row's pin mounting means, high-frequency electronic tuner have a variety of outer
Shape and size, to adapt to different purposes and mounting means.
In cable of cable TV transmitting procedure, may because of wire electric leakage, loose contact, not altogether etc., or lightning induction,
Abnormal voltage is incorporated into user equipment, causes receiving device to receive interference, damage even personal injury.Therefore from 2012 11
From month 1 day, state compulsion require list marketing TV and part receiving terminal apparatus must solar obligation isolated using antenna
Device.
Antenna isolator internal high-voltage isolation capacitance, to input between output ground, input signal cored wire and output cored wire
Enter horizontal high voltage coupling, be in high impedance to direct current and low frequency signal, can eliminate because of input entoilage line, signal wire and receiving device
Interference is received between line, signal wire caused by potential difference, avoids the danger such as receiving device spontaneous combustion, on fire, protects user's property and life
Life safety.
As shown in figure 1, antenna isolator between input ground 1 and output ground 1, has two between input ground 2 and output ground 2
Group ground connection isolation capacitance, each group of ground connection isolation capacitance may be formed by 1 to 5.For different isolation voltage requirements, high pressure
Isolation capacitance is divided into 500V, 1000V, 2000V or higher.
Require according to state compulsion, needed in television set, set top box etc. from external antenna or outer, coaxial cable access letter
Number receiving device, its signal input part needs attaching antenna isolator, realizes and DC voltage in input signal is set with reception
Isolation between standby.
To meet this mandatory rules of law, in addition to external antenna isolator is installed additional in receiving device input, existing TV
Being designed as of machine or set top box reduces cost, mostly using the method for tuning two-in-one module in isolation built in equipment, is specifically
Antenna isolator is built in the input tuner inside television set or set top box, antenna isolation+tuning is formed and receives two conjunctions
One module.
As shown in Fig. 2 isolation tunes two-in-one module, by built-in ground connection isolation capacitance, realize to input and
DC-isolation and high voltage protection between module ground；By signal isolation electric capacity, realize input radio frequency signal and tuning receives
The isolation and high voltage protection of DC voltage between signal.It is isolated and the size and the pressure-resistant phase of isolation capacitance of high voltage protection voltage
Close.
Under conditions of identical capacitance values, the higher volume of its cost of the electric capacity of more high withstand voltage is bigger.At present built in tuner
Isolated location, be control cost and modular volume, generally using the isolation capacitance less than or equal to 2000V DC break down voltages, its
Voltage is isolated and the maximum DC break down voltage value for being no more than isolation capacitance used of the grade of protection.
Common isolation tunes two-in-one module and can realized to input signal with tuning reception signal, being received with tuning to input
The high_voltage isolation between isolation between ground, but following technical problem in practical probation be present：
1st, to coming from the transient voltage value at input signal end beyond the built-in isolation capacitance for isolating the two-in-one module of tuning
During pressure voltage, it is impossible to protect low pressure-resistant isolation capacitance not breakdown and damage, and can not protect two-in-one module and set top box,
Television set is without damage；
2nd, cost is high, and volume is big；
3rd, to ensure more inexpensive and smaller volume, isolate isolation capacitance used by tuning two-in-one module and be generally
500th, the patch capacitor of 1000 maximum 2000V DC break down voltages, its to the moment direct current surge voltage that is entered by rf inputs most
Big insulation blocking value corresponds to 500,1000 maximum 2000V.Lifting is such as needed such as to meet national standard to surge voltage protective value
, it is necessary to improve that module internal isolation capacitance is resistance to be pressed onto 6000V, the electric capacity that 6000V is pressure-resistant means for 6000V carrying out surge protection requirement
The volume of super large and Geng Gao cost, it is meant that module will take more large scale, and unit price will be lifted accordingly, and market is difficult to connect
By；
4th, current normal domestic product market, for the pressure-resistant patch capacitor more than 2000V, it is necessary to be ordered to factory is special
Do, cycle length, cost price is high, even if using plug-in unit electric capacity, the volume of its super large can not meet module product small size
Need；
Even if the 5th, due to the close device arrangement interval of module internal, also it is easy to using the isolation capacitance of more high withstand voltage
Cause high pressure to produce space electric discharge after entering, cause module to be damaged.
Utility model content
The technical problems to be solved in the utility model is to provide that a kind of size is small, and cost is low, simple in construction, can protect low
Pressure-resistant isolation capacitance is not breakdown and damages, and can protect two-in-one module and set top box, television set day without damage
Line isolated location and isolation tune two-in-one die set.
The technical solution adopted in the utility model is as follows：A kind of antenna isolated location, including two groups of input and output and penetrate
Frequency input and output, are provided with ground connection isolation capacitance between every group of input ground end and output ground terminal, rf inputs export with radio frequency
Signal isolation electric capacity is provided between end；Before ground connection isolation capacitance and signal isolation electric capacity, increase a direct current absorption circuit；
The direct current absorption circuit includes direct current absorption circuit component；Described direct current absorption circuit component one end be connected to input ground end and
Between ground connection isolation capacitance corresponding to the input ground, the other end is connected between rf inputs and the signal isolation electric capacity.
The direct current absorption circuit component includes a component, and one end is with being connected to the input on one of which input and output ground
Between ground connection isolation capacitance corresponding to end and the input ground, the other end be connected to rf inputs and the signal isolation electric capacity it
Between.
The direct current absorption circuit component includes two components, and one one end is connected to one of which input and output ground
Between ground connection isolation capacitance corresponding to input ground end and the input ground, the other end is connected to rf inputs and the signal isolation
Between electric capacity；Another one end is connected to ground connection isolation corresponding to the input ground end and the input ground on another group of input and output ground
Between electric capacity, the other end is connected between rf inputs and the signal isolation electric capacity.
The direct current absorption circuit component is hollow coil inductance, coiling core inductance or the component for possessing correlation function.
A kind of isolation based on above-mentioned antenna isolated location tunes two-in-one die set, including a metallic shield and
One PCBA circuit board assemblies；The PCBA circuit board assemblies are fixed in metallic shield；In the PCBA circuit board assemblies
On, be provided with signal probe, the signal probe be used for power supply, bus and intermediate frequency output external connection；
On the PCBA circuit board assemblies, isolated location and tuning receiving unit are integrated with.
The isolation tunes two-in-one die set and is installed on the mainboard inside television set or set top box, and rf inputs are straight
Cable television drop cable is connect in succession.
The isolation tunes two-in-one die set and is directly welded on set top box main.
Perforate is provided with the metallic shield, for fixing isolated form coaxial input adapter, and the isolated form is same
Dielectric is provided with to the input of axle input adapter between metallic shield to realize that circuit is isolated.
It is fixed on through metallic shield on PCBA circuit board assemblies to the input of the isolated form coaxial input adapter, and
It is connected by being grounded isolation capacitance with the ground wire of PCBA circuit board assemblies.
The center signal line of the isolated form coaxial input adapter, PCBA circuit board assemblies are fixed on through metallic shield
On, it is connected with the signal input part of isolation capacitance.
Compared with prior art, the beneficial effects of the utility model are：Size is small, and cost is low, is greatly improved isolation
Tuning module bears it remote super to coming from the tolerance of the high-voltage dc signal of outer, coaxial cable signal cored wire
The voltge surge of signal isolation electric capacity pressure voltage, it is greatly improved the use of the set top box, television set of module and built-in module
Safety, can protect low pressure-resistant isolation capacitance not breakdown and damage, and can protect two-in-one module and set top box, TV
Machine is without damage.
Brief description of the drawings
Fig. 1 is the theory structure schematic diagram of prior art antenna isolator.
Fig. 2 is that the isolation based on the isolated location of prior art antenna shown in Fig. 1 tunes two-in-one module theory structure signal
Figure.
Fig. 3 is that isolation tuning two-in-one die set theory structure of the present invention based on the antenna isolated location after improvement shows
It is intended to.
Fig. 4 is that isolation of the present invention based on the wherein embodiment of the antenna isolated location after improvement tunes two-in-one module dress
Put theory structure schematic diagram.
Embodiment
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing and implementation
Example, the utility model is further elaborated.It should be appreciated that specific embodiment described herein is only explaining this
Utility model, it is not used to limit the utility model.
This specification（Including any summary and accompanying drawing）Disclosed in any feature, unless specifically stated otherwise, can be by other
Equivalent or with similar purpose alternative features are replaced.I.e., unless specifically stated otherwise, each feature is a series of equivalent
An or example in similar characteristics.
In the present invention, it is specifically described by taking DTV as an example.
Specific embodiment 1
A kind of antenna isolated location, as shown in figure 3, including two groups of input and output and radio frequency input and output, every group of input
Ground connection isolation capacitance is provided between ground terminal and output ground terminal, signal isolation is provided between rf inputs and RF output end
Electric capacity；Before ground connection isolation capacitance and signal isolation electric capacity, increase a direct current absorption circuit；The direct current absorption circuit includes
Direct current absorption circuit component；Described direct current absorption circuit component one end be connected to ground connection corresponding to input ground end and the input ground every
From between electric capacity, the other end is connected between rf inputs and the signal isolation electric capacity.
A preposition direct current absorption circuit is added inside traditional isolated location, is greatly improved isolation tuning mould
Group to coming from the tolerance of the high-voltage dc signal of outer, coaxial cable signal cored wire, allow its bear remote super signal every
From the voltge surge of electric capacity pressure voltage, be greatly improved the set top box of module and built-in module, television set it is safe to use.Directly
It is anterior in ground connection isolation capacitance and signal isolation electric capacity to flow the design of absorption circuit component, ensure that isolated location to input and penetrate
The isolation performance of frequency input does not change.
Effective radio-frequency input signals is TV carrier signal, and its frequency of use scope is 45-1000MHz, improves increase
Preposition direct current absorbent assembly only direct current low frequency signal voltage is absorbed, have no effect on the transmission of high-frequency signal, ensure that
The receiving sensitivity of follow-up tuning receiving unit is unaffected.
Specific embodiment 2
On the basis of specific embodiment 1, the direct current absorption circuit component includes a component, and one end is connected to wherein
Between ground connection isolation capacitance corresponding to the input ground end and the input ground on one group of input and output ground, the other end is connected to radio frequency input
Between end and the signal isolation electric capacity.
Specific embodiment 3
On the basis of specific embodiment 1 or 2, the direct current absorption circuit component includes two components, one one end
It is connected between ground connection isolation capacitance corresponding to the input ground end and the input ground on one of which input and output ground, other end connection
Between rf inputs and the signal isolation electric capacity；Another one end is with being connected to the input on another group of input and output ground
Between ground connection isolation capacitance corresponding to end and the input ground, the other end be connected to rf inputs and the signal isolation electric capacity it
Between.
Specific embodiment 4
On the basis of one of specific embodiment 1 to 3, as shown in figure 4, the direct current absorption circuit component is hollow coil
Inductance, coiling core inductance or the component for possessing correlation function.
The size of inductance meets that the high-voltage signal of radio frequency input can not pass through.Cost is low, reduces the signal built in module
Requirement of the isolation capacitance to tolerating high voltage, product cost is reduced on the basis of security performance lifting.Only need minimum
Cloth member cabling space, it is ensured that original module possesses higher security performance in the case of volume is immovable.
As shown in figure 4, the ground connection isolation capacitance and signal isolation electric capacity in isolated location are anterior, in radio-frequency input signals and
Input has bridged a hollow coil inductance between ground, and the high-voltage dc signal for entering radio frequency input is importing directly into input
Ground, absorbed with being transfused to, protect the signal isolation electric capacity at rear portion；Simultaneously because hollow coil inductance has resistance to radiofrequency signal
It every effect, ensure that effective TV carrier signal will not incur loss in radio frequency input, ensure that the signal spirit that tuning receives
Sensitivity.
Specific embodiment 5
On the basis of one of specific embodiment 1 to 4, one kind isolation tunes two-in-one die set, including a metal
Radome and a PCBA circuit board assemblies；The PCBA circuit board assemblies are fixed（It is welding in this specific embodiment）Yu Jin
Belong in radome；On the PCBA circuit board assemblies, set（Set in this specific embodiment for welding）There is signal probe, should
Signal probe be used for power supply, bus and intermediate frequency output etc. module external connection；
On the PCBA circuit board assemblies, isolated location and tuning receiving unit are integrated with.
External radio-frequency signal is inputted by being fixed on the coaxial fitting of metallic shield, and after high_voltage isolation, input is adjusted
Humorous receiving unit, device after filtering, after filtering out useless interference signal, effective TV carrier signal amplifies through controllable gain, become
After frequency reception, intermediate-frequency filter and intermediate frequency controllable gain amplifier, by being welded in the probe on PCBA circuit board assemblies from mould
Group output IF output signal.
Wherein, wave filter is one or more levels LC wave filter cascade composition；In this specific embodiment, intermediate-frequency filter is
Digital filter, intermediate frequency output export for Low Medium Frequency or zero intermediate frequency.Frequency conversion, which receives, includes frequency converter, local oscillator, phaselocked loop
And controller, controller control phaselocked loop, indirect control local oscillator work in assigned frequency, referred to caused by local oscillator
The local oscillated signal for determining frequency inputs to frequency converter, and the signal from controllable gain amplifier received with frequency converter differs
Frequently, export and give intermediate frequency digital wave filter；Frequency converter is one-level frequency conversion or two-stage frequency conversion.Controller can control controllable gain amplifier
Gain and intermediate frequency digital wave filter working condition；Controller is connected to I by probe2C buses are communicated.
Specific embodiment 6
On the basis of specific embodiment 5, the isolation tunes two-in-one die set and is installed on inside television set top box
Set top box main on, rf inputs are directly connected to cable television drop cable.
Specific embodiment 7
On the basis of specific embodiment 5 or 6, the isolation tunes two-in-one die set and is directly welded at set top box master
On plate.
Specific embodiment 8
On the basis of one of specific embodiment 5 to 7, perforate is provided with the metallic shield, is isolated for fixed
Type coaxial input adapter, and the input of the isolated form coaxial input adapter dielectric is provided between metallic shield
（It is plastic medium in this specific embodiment）To realize that circuit is isolated.
Specific embodiment 9
On the basis of specific embodiment 8, consolidate through metallic shield to the input of the isolated form coaxial input adapter
It is fixed（It is to be welded and fixed in this specific embodiment）On PCBA circuit board assemblies, and by being grounded isolation capacitance and PCBA circuit boards
The ground wire connection of component.
Specific embodiment 10
On the basis of specific embodiment 8, the center signal line of the isolated form coaxial input adapter, through metallic shield
Cover is fixed（With welding manner in this specific embodiment）On PCBA circuit board assemblies, connect with the signal input part of isolation capacitance
Connect, by direct current absorption circuit component, after being absorbed to the DC voltage for coming from external radio frequency input, remove direct current
The radiofrequency signal of pressure enters tuning receiving unit by signal isolation electric capacity, realizes that follow-up signal transmits.
After the two-in-one module of this patent built in digital television bidirectional set top box, the coaxial drop cable of broadcasting and TV is defeated through radio frequency first
Enter to terminate and tune two-in-one module into modified isolation, grounded isolation capacitance is realized to coming from coaxial cable input ground of registering one's residence
High-voltage signal and the high-voltage capacitance of two-in-one module and set top box ground wire isolation, come from coaxial cable rf inputs of registering one's residence
Signal, initially enter isolated location, through direct current absorption circuit component, the subsidiary DC voltage on radio-frequency input signals led
Enter the radiofrequency signal for input ground, removing DC voltage（Mainly TV carrier signal）Through in module after signal isolation electric capacity
Portion's PCB trace enters tuning receiving unit, inputs to subsequent filter, completes filtering out for the interference signals such as FM/WIFI/EOC, from
The signal of wave filter output, after amplified, frequency conversion reception, intermediate frequency filtering, intermediate frequency amplification, intermediate-freuqncy signal, input are exported from module
To follow-up demodulation, decoding circuit, be converted to standard television signal and exported from set top box, access television set is watched.
The difference of frequency range according to residing for radio-frequency input signals, the direct current absorption circuit component built in isolated location, Ke Yishi
Hollow coil inductance, coiling core inductance and the component for possessing correlation function.
Claims (10)
1. a kind of antenna isolated location, including two groups of input and output and radio frequency input and output, every group of input ground end and output ground
Ground connection isolation capacitance is provided between end, signal isolation electric capacity is provided between rf inputs and RF output end；Its feature
It is：Before ground connection isolation capacitance and signal isolation electric capacity, increase a direct current absorption circuit；The direct current absorption circuit includes
Direct current absorption circuit component；Described direct current absorption circuit component one end be connected to ground connection corresponding to input ground end and the input ground every
From between electric capacity, the other end is connected between rf inputs and the signal isolation electric capacity.
2. antenna isolated location according to claim 1, it is characterised in that：The direct current absorption circuit component includes one
Component, one end are connected between ground connection isolation capacitance corresponding to the input ground end and the input ground on one of which input and output ground,
The other end is connected between rf inputs and the signal isolation electric capacity.
3. antenna isolated location according to claim 1, it is characterised in that：The direct current absorption circuit component includes two
Component, one one end are connected to ground connection isolation capacitance corresponding to the input ground end and the input ground on one of which input and output ground
Between, the other end is connected between rf inputs and the signal isolation electric capacity；Another one end be connected to another group it is defeated
Between entering ground connection isolation capacitance corresponding to the input ground end and the input ground on output ground, the other end is connected to rf inputs and institute
State between signal isolation electric capacity.
4. the antenna isolated location according to one of Claim 1-3, it is characterised in that：The direct current absorption circuit component
For hollow coil inductance, coiling core inductance or the component for possessing correlation function.
5. a kind of isolation based on one of claim 1 to 4 antenna isolated location tunes two-in-one die set, its feature
It is：Including a metallic shield and a PCBA circuit board assemblies；The PCBA circuit board assemblies are fixed on metallic shield
In cover；On the PCBA circuit board assemblies, be provided with signal probe, the signal probe be used for power supply, bus and intermediate frequency it is defeated
The external connection gone out；
On the PCBA circuit board assemblies, isolated location and tuning receiving unit are integrated with.
6. isolation tunes two-in-one die set according to claim 5, it is characterised in that：The isolation tunes two-in-one module
Device is installed on the mainboard inside television set or set top box, and rf inputs are directly connected to cable television drop cable.
7. isolation tunes two-in-one die set according to claim 6, it is characterised in that：The isolation tunes two-in-one mould
Group device is directly welded on set top box main.
8. isolation tunes two-in-one die set according to claim 5, it is characterised in that：Set on the metallic shield
Have perforate, for fixing isolated form coaxial input adapter, and the input of the isolated form coaxial input adapter and metallic shield
Dielectric is provided between cover to realize that circuit is isolated.
9. isolation tunes two-in-one die set according to claim 8, it is characterised in that：Coaxially input connects the isolated form
It is fixed on through metallic shield on PCBA circuit board assemblies to the input of head, and by being grounded isolation capacitance and PCBA circuit boards
The ground wire connection of component.
10. isolation tunes two-in-one die set according to claim 8, it is characterised in that：The isolated form coaxially inputs
The center signal line of joint, is fixed on PCBA circuit board assemblies through metallic shield, the signal input part with isolation capacitance
Connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721196488.5U CN207166632U (en) | 2017-09-19 | 2017-09-19 | A kind of antenna isolated location and isolation tune two-in-one die set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721196488.5U CN207166632U (en) | 2017-09-19 | 2017-09-19 | A kind of antenna isolated location and isolation tune two-in-one die set |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207166632U true CN207166632U (en) | 2018-03-30 |
Family
ID=61722275
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721196488.5U Expired - Fee Related CN207166632U (en) | 2017-09-19 | 2017-09-19 | A kind of antenna isolated location and isolation tune two-in-one die set |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207166632U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110852121A (en) * | 2018-08-20 | 2020-02-28 | 紫光同芯微电子有限公司 | Novel non-contact transponder receiving circuit |
| CN110913253A (en) * | 2018-09-14 | 2020-03-24 | 金宝电子工业股份有限公司 | Connector module and set-top box |
| CN113993227A (en) * | 2021-10-08 | 2022-01-28 | 深圳市广和通无线股份有限公司 | Communication module and terminal equipment |
-
2017
- 2017-09-19 CN CN201721196488.5U patent/CN207166632U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110852121A (en) * | 2018-08-20 | 2020-02-28 | 紫光同芯微电子有限公司 | Novel non-contact transponder receiving circuit |
| CN110913253A (en) * | 2018-09-14 | 2020-03-24 | 金宝电子工业股份有限公司 | Connector module and set-top box |
| CN110913253B (en) * | 2018-09-14 | 2021-10-08 | 金宝电子工业股份有限公司 | Connector module and set-top box |
| CN113993227A (en) * | 2021-10-08 | 2022-01-28 | 深圳市广和通无线股份有限公司 | Communication module and terminal equipment |
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Granted publication date: 20180330 Termination date: 20210919 |