CN204316631U - A kind of separate type tuner interface circuit - Google Patents
A kind of separate type tuner interface circuit Download PDFInfo
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- CN204316631U CN204316631U CN201420856769.9U CN201420856769U CN204316631U CN 204316631 U CN204316631 U CN 204316631U CN 201420856769 U CN201420856769 U CN 201420856769U CN 204316631 U CN204316631 U CN 204316631U
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Abstract
The utility model discloses a kind of separate type tuner interface circuit, comprise supply unit, USB3.0 interface, testing circuit, cpu circuit, switching circuit, LNB power-supplying circuit; Described USB3.0 interface is used for being connected to television tuner and TV SKD; The ADC input port of described cpu circuit is connected to described testing circuit, and the GPIO delivery outlet of this cpu circuit is connected to the control end of switching circuit; Cpu circuit judges inserted tuner type by the signal that testing circuit provides, and exports control signal, with the action of control switch circuit to switching circuit.The utility model structure is simple, easy to use, has saved machine of the purchasing cost of user simultaneously, has been convenient to the popularization of product.
Description
Technical field
The utility model relates to a kind of separate type tuner interface circuit, particularly relates to a kind of separate type tuner interface circuit can selecting tuner according to user's request.
Background technology
Along with popularizing of Digital Television and eliminating gradually of anolog TV signals, the function that increasing TV receives with DVB-T, DVB-S/S2 integration.Because the popularity of user's different systems Set Top Box is different, certain customers need to buy the TV with DVB-S/S2 receiving function, and certain customers have purchased the Set Top Box of DVB-S/S2, without the need to the receiving function of DVB-S/S2, namely the integrated DVB-S/S2 receiving function of TV becomes the unnecessary cost that user bears, and is unfavorable for the popularization of product.
Utility model content
The purpose of this utility model is the deficiency overcoming prior art, provides a kind of separate type tuner interface circuit, and the selectivity realizing high frequency tuner circuit 7 is installed, and is applicable to all kinds of clients of different demand.
The utility model solves the technical scheme that its technical problem adopts: a kind of separate type tuner interface circuit, comprising:
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 input of this testing circuit is connected with television tuner by USB3.0 interface, 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 switching circuit; Cpu circuit judges inserted tuner type by the signal that testing circuit provides, and exports control signal, with the action of control switch circuit to switching circuit;
One switching circuit, this switching 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 be connected in series mutually and the second resistance, and its serial connection 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 switching 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 beneficial effects of the utility model are: be connected to described testing circuit by the ADC input port of cpu circuit, and the GPIO delivery outlet of this cpu circuit is connected to the control end of switching circuit; Cpu circuit judges inserted tuner type by the signal that testing circuit provides, and exports control signal, with the action of control switch circuit to switching circuit; System can automatic decision insert the type of tuner, by LNB power-supplying circuit adjustment power supply, user can select tuner according to demand, easy to use, has saved cost simultaneously, and product is more easily promoted.
Below in conjunction with drawings and Examples, the utility model is described in further detail; But a kind of separate type tuner interface circuit of the present utility model is not limited to embodiment.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present utility model;
Fig. 2 is circuit connection diagram of the present utility model.
Embodiment
Embodiment
See shown in Fig. 1 to Fig. 2, a kind of separate type tuner interface circuit of the present utility model, comprising:
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 input of this testing circuit 5 is connected with television tuner by USB3.0 interface circuit 6, 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, the connection requirement of all types of tuner can be adapted to;
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 switching circuit 2; Cpu circuit 4 judges inserted tuner type by the signal that testing circuit 5 provides, and exports control signal to switching circuit 2, with the action of control switch circuit 2;
One switching circuit 2, this switching 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 (Low Noise Block), and LNB power-supplying circuit 3 is according to the power supply of control signal adjustment to high frequency tuner circuit 7 of CPU.
Further, described testing circuit 5 is made up of the first resistance R1 be connected in series mutually and the second resistance R2, its serial connection 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.
By the dividing potential drop of the first resistance R1 and the second resistance R2, point place's formation one predeterminated voltage is connected in series in the first resistance R1 and the second resistance R2, current potential for tuner input is compared judgement, determine tuner type, output control signals to LNB power-supplying circuit 3, change power supply state, ensure that circuit normally works.
Further, described switching 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 a kind of separate type tuner interface circuit of the present utility model; but the utility model is not limited to embodiment; every above embodiment is done according to technical spirit of the present utility model any simple modification, equivalent variations and modification, all fall in the protection range of technical solutions of the utility model.
Claims (3)
1. a separate type tuner interface circuit, comprising:
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 input of this testing circuit is connected with television tuner by USB3.0 interface, 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 switching circuit; Cpu circuit judges inserted tuner type by the signal that testing circuit provides, and exports control signal, with the action of control switch circuit to switching circuit;
One switching circuit, this switching 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 be connected in series mutually and the second resistance, its serial connection 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 switching 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 |
|---|---|---|---|
| CN201420856769.9U CN204316631U (en) | 2014-12-30 | 2014-12-30 | A kind of separate type tuner interface circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420856769.9U CN204316631U (en) | 2014-12-30 | 2014-12-30 | A kind of separate type tuner interface circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204316631U true CN204316631U (en) | 2015-05-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420856769.9U Active CN204316631U (en) | 2014-12-30 | 2014-12-30 | A kind of separate type tuner interface circuit |
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| CN (1) | CN204316631U (en) |
Cited By (1)
| 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 |
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2014
- 2014-12-30 CN CN201420856769.9U patent/CN204316631U/en active Active
Cited By (1)
| 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 |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |