CN105812688A - Split-type LNB interface circuit - Google Patents
Split-type LNB interface circuit Download PDFInfo
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- CN105812688A CN105812688A CN201410840977.4A CN201410840977A CN105812688A CN 105812688 A CN105812688 A CN 105812688A CN 201410840977 A CN201410840977 A CN 201410840977A CN 105812688 A CN105812688 A CN 105812688A
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- circuit
- interface
- cpu
- tuner
- lnb
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Abstract
The invention discloses a split-type LNB (low noise block) interface circuit. The split-type LNB interface circuit comprises a power supply device, an USB3.0 interface, a detection circuit, a CPU circuit, a switch circuit and an LNB power supply control circuit. The USB3.0 interface is connected between a television LNB and a television mainboard; the ADC input port of the CPU circuit is connected to the detection circuit, and the GPIO output port of the CPU circuit is connected to the control terminal of the switch circuit; the CPU circuit determines the type of the inserted LNB according to signals provided by the detection circuit, and outputs control signals to the switch circuit in order to control the operation of the control circuit. The split-type LNB interface circuit is of a simple structure, is convenient to use, saves machine purchasing cost for a user, and facilitates the popularization of products.
Description
Technical field
The present invention relates to separate type tuner interface circuit, particularly relate to select according to user's request the separate type tuner interface circuit of tuner.
Background technology
Along with popularizing of DTV and eliminating gradually of anolog TV signals, the function that increasing TV receives with DVB-T, DVB-S/S2 integration.Owing to the popularity of user's different systems Set Top Box is different, certain customers need to buy the TV with DVB-S/S2 receive capabilities, and certain customers have purchased the Set Top Box of DVB-S/S2, receive capabilities without DVB-S/S2, namely the integrated DVB-S/S2 receive capabilities of TV becomes the unnecessary cost that user undertakes, and is unfavorable for the popularization of product.
Summary of the invention
It is an object of the invention to overcome the deficiency of prior art, it is provided that separate type tuner interface circuit, it is achieved the selectivity of high frequency tuner circuit 7 is installed, it is adaptable to all kinds of clients of different demands.
The technical solution adopted for the present invention to solve the technical problems is: separate type tuner interface circuit, including:
One supply unit, is used for providing power supply signal to TV SKD and television tuner；
One USB3.0 interface, is used for being connected between television tuner and TV SKD；
One testing circuit, the USB3.0 interface that enters through of this testing circuit is connected with television tuner, and the output of this testing circuit is connected with the input port of cpu circuit；
One cpu circuit, the ADC input port of this cpu circuit is connected to described testing circuit, and the GPIO delivery outlet of this cpu circuit is connected to the control end of on-off circuit；Cpu circuit judges the tuner type inserted by the signal that testing circuit provides, and exports control signal to on-off circuit, to control the action of on-off circuit；
One on-off circuit, this on-off circuit is connected between supply unit and LNB power-supplying circuit, to open or close the power supply of LNB power-supplying circuit；
LNB power-supplying circuit, is connected with television tuner by USB3.0 interface, to power to television tuner.
Preferably, described testing circuit is made up of the first resistance concatenated mutually and the second resistance, and its concatenation point is connected with the ADC input port of cpu circuit, and an end of described first resistance receives the 5V output of supply unit, one end ground connection of described second resistance.
Preferably, described on-off circuit is metal-oxide-semiconductor, and the S end of this metal-oxide-semiconductor is connected to supply unit, and the D end of this metal-oxide-semiconductor is connected to LNB power supply circuits input, and the G end of this metal-oxide-semiconductor is connected to the GPIO output port of described cpu circuit.
The invention has the beneficial effects as follows: be connected to described testing circuit by the ADC input port of cpu circuit, the GPIO delivery outlet of this cpu circuit is connected to the control end of on-off circuit；Cpu circuit judges the tuner type inserted by the signal that testing circuit provides, and exports control signal to on-off circuit, to control the action of on-off circuit；System can the type of the inserted tuner of automatic decision, powered by LNB power-supplying circuit adjustment, user can select tuner according to demand, easy to use, has saved cost simultaneously, makes product be more easy to popularization.
Below in conjunction with drawings and Examples, the present invention is described in further detail；But the separate type tuner interface circuit of the present invention is not limited to embodiment.
Accompanying drawing explanation
Fig. 1 is principles of the invention block diagram；
Fig. 2 is the circuit connection diagram of the present invention.
Detailed description of the invention
Embodiment
Referring to shown in Fig. 1 to Fig. 2, the separate type tuner interface circuit of the present invention, including:
One supply unit 1, is used for providing power supply signal to TV SKD and television tuner；
One USB3.0 interface circuit 6, is used for being connected between television tuner and TV SKD；
One testing circuit 5, the USB3.0 interface circuit 6 that enters through of this testing circuit 5 is connected with television tuner, and the output of this testing circuit 5 is connected with the input port of cpu circuit 4；Use USB3.0 interface as connecting interface, be suitable for the connection requirement of all types of tuner；
One cpu circuit 4, the ADC input port of this cpu circuit 4 is connected to described testing circuit 5, and the GPIO delivery outlet of this cpu circuit 4 is connected to the control end of on-off circuit 2；Cpu circuit 4 judges the tuner type inserted by the signal that testing circuit 5 provides, and exports control signal to on-off circuit 2, to control the action of on-off circuit 2；
One on-off circuit 2, this on-off circuit 2 is connected between supply unit 1 and LNB power-supplying circuit 3, to open or close the power supply of LNB power-supplying circuit 3；
LNB power-supplying circuit 3, is connected with television tuner by USB3.0 interface circuit 6, to power to television tuner；LNB is the abbreviation of tuner (LowNoiseBlock), and LNB power-supplying circuit 3 is according to power supply to high frequency tuner circuit 7 of the control signal adjustment of CPU.
Further, described testing circuit 5 is made up of the first resistance R1 concatenated mutually and the second resistance R2, its concatenation point is connected with the ADC input port of cpu circuit 4, and an end of described first resistance R1 receives the 5V output of supply unit 1, one end ground connection of described second resistance R2.
Dividing potential drop by the first resistance R1 and the second resistance R2, string junction in the first resistance R1 and the second resistance R2 forms a predeterminated voltage, current potential for tuner input is compared judgement, determine tuner type, output control signals to LNB power-supplying circuit 3, change power supply state, it is ensured that normal circuit operation.
Further, described on-off circuit 2 is metal-oxide-semiconductor Q1, and the S end of this metal-oxide-semiconductor Q1 is connected to the 5V voltage output of supply unit 1, and the D end of this metal-oxide-semiconductor is connected to LNB power supply circuits input, and the G end of this metal-oxide-semiconductor Q1 is connected to the GPIO output port of described cpu circuit 4.
Above-described embodiment is only used for further illustrating the separate type tuner interface circuit of the present invention; but the invention is not limited in embodiment; every any simple modification, equivalent variations and modification above example made according to the technical spirit of the present invention, each falls within the protection domain of technical solution of the present invention.
Claims (3)
1. separate type tuner interface circuit, including:
One supply unit, is used for providing power supply signal to TV SKD and television tuner；
One USB3.0 interface, is used for being connected between television tuner and TV SKD；
One testing circuit, the USB3.0 interface that enters through of this testing circuit is connected with television tuner, and the output of this testing circuit is connected with the input port of cpu circuit；
One cpu circuit, the ADC input port of this cpu circuit is connected to described testing circuit, and the GPIO delivery outlet of this cpu circuit is connected to the control end of on-off circuit；Cpu circuit judges the tuner type inserted by the signal that testing circuit provides, and exports control signal to on-off circuit, to control the action of on-off circuit；
One on-off circuit, this on-off circuit is connected between supply unit and LNB power-supplying circuit, to open or close the power supply of LNB power-supplying circuit；
LNB power-supplying circuit, is connected with television tuner by USB3.0 interface, to power to television tuner.
2. separate type tuner interface circuit according to claim 1, it is characterized in that: described testing circuit is made up of the first resistance concatenated mutually and the second resistance, its concatenation point is connected with the ADC input port of cpu circuit, one end of described first resistance receives the 5V output of supply unit, one end ground connection of described second resistance.
3. separate type tuner interface circuit according to claim 1, it is characterized in that: described on-off circuit is metal-oxide-semiconductor, the S end of this metal-oxide-semiconductor is connected to supply unit, and the D end of this metal-oxide-semiconductor is connected to LNB power supply circuits input, and the G end of this metal-oxide-semiconductor is connected to the GPIO output port of described cpu circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410840977.4A CN105812688A (en) | 2014-12-30 | 2014-12-30 | Split-type LNB interface circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410840977.4A CN105812688A (en) | 2014-12-30 | 2014-12-30 | Split-type LNB interface circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105812688A true CN105812688A (en) | 2016-07-27 |
Family
ID=56981137
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410840977.4A Pending CN105812688A (en) | 2014-12-30 | 2014-12-30 | Split-type LNB interface circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105812688A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107801079A (en) * | 2017-11-16 | 2018-03-13 | 青岛海信电器股份有限公司 | Television set |
| CN108282628A (en) * | 2018-02-09 | 2018-07-13 | 深圳创维－Rgb电子有限公司 | TV motherboard, TV motherboard component and DTV |
-
2014
- 2014-12-30 CN CN201410840977.4A patent/CN105812688A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107801079A (en) * | 2017-11-16 | 2018-03-13 | 青岛海信电器股份有限公司 | Television set |
| CN107801079B (en) * | 2017-11-16 | 2020-11-06 | 海信视像科技股份有限公司 | Television receiver |
| CN108282628A (en) * | 2018-02-09 | 2018-07-13 | 深圳创维－Rgb电子有限公司 | TV motherboard, TV motherboard component and DTV |
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| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160727 |