CN213817965U - Polarization control circuit of set top box - Google Patents
Polarization control circuit of set top box Download PDFInfo
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- CN213817965U CN213817965U CN202023059730.9U CN202023059730U CN213817965U CN 213817965 U CN213817965 U CN 213817965U CN 202023059730 U CN202023059730 U CN 202023059730U CN 213817965 U CN213817965 U CN 213817965U
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Abstract
The utility model discloses a STB polarization control circuit, including resistance R1, triode Q1, resistance R2, resistance R3, resistance R4, resistance R5, triode Q2, electric capacity C1, adjustable stabiliser U1, resistance R6, electric capacity C2, electric capacity C3, diode D1, resistance R7, triode Q3 and resistance R8, adjustable stabiliser U1 is the adjustable three-terminal anode voltage regulator of LM317, mainboard power input 13/18 is connected to resistance R1 one end, signal end F22K is connected to resistance R5, resistance R8 connects LNB-EN foot, export high level signal by LNB-EN foot, its circuit constitutes the design simply, the polarization that equally can be applicable to STB and be used for program signal is handled, the circuit components and parts that easily break down are less, current circuit constitutes the polarization control circuit of design complicacy relatively, its fault rate is lower.
Description
Technical Field
The utility model belongs to the technical field of the STB, concretely relates to STB polarization control circuit.
Background
The satellite television set-top box is a consumer electronic product which converts a satellite digital television signal into a high-quality audio/video signal, so that a user can watch a satellite television program on the conventional analog television to carry out interactive digital entertainment, education and commercial activities. In order to receive program signals through a set-top box, a signal polarization control circuit is generally required to be arranged in the set-top box, the specific forming forms of the existing signal polarization control circuit are various, but the problems that the circuit forming design is complex, faults are easy to occur due to a certain component and the fault rate is high generally exist.
Disclosure of Invention
The utility model aims at providing a polarization control circuit of STB that can be applicable to the STB equally and be used for program signal's polarization to handle, and the circuit constitutes the design simply, the fault rate is low.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a polarization control circuit of a set top box comprises a resistor R1, a triode Q1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a triode Q2, a capacitor C1, an adjustable voltage regulator U1, a resistor R6, a capacitor C2, a capacitor C3, a diode D1, a resistor R7, a triode Q3 and a resistor R8, wherein one end of the resistor R1 is connected with a main board power input end 13/18, the other end of the resistor R1 is connected with a base of the triode Q1, a collector of the triode Q1 is connected with the resistor R2 and one end of the resistor R3, an emitter of the triode Q1 is connected with a collector of the triode Q2, the other end of the resistor R2, one end of the resistor R4 and one end of the capacitor C1, a base of the triode Q2 is connected with one end of the resistor R5, the other end of the resistor R5 is connected with a signal terminal F5, and the emitter of the resistor Q5 and the other end of the capacitor C1 are connected with the ground, the other end of the resistor R3 is connected with an ADJ pin of the adjustable voltage regulator U1, one end of the resistor R6, one end of the capacitor C2 and a collector of the triode Q3, the other end of the capacitor C2 is grounded, an emitter of the triode Q3 is grounded, a base of the triode Q3 is connected with one end of the resistor R8, the other end of the resistor R8 is connected with an LNB-EN pin, the other end of the resistor R6 is connected with a Vout pin of the adjustable voltage regulator U1, a positive electrode of the diode D1 and one end of the capacitor C3, the other end of the capacitor C3 is grounded, a negative electrode of the diode D1 is connected with one end of the resistor R7, the other end of the resistor R7 is grounded, and a pin of the adjustable voltage regulator U1 is connected with a 22V power supply.
Further, the adjustable voltage regulator U1 is an LM317 adjustable three-terminal anode voltage regulator.
The utility model discloses following beneficial effect has:
the utility model discloses STB polarization control circuit, its circuit constitution design is simple, can be applicable to the polarization processing that the STB is used for program signal equally, and the circuit components and parts that easily break down are less, and current circuit constitutes the polarization control circuit that the design is complicated relatively, and its fault rate is lower.
Drawings
Fig. 1 is a simple schematic diagram of the polarization control circuit of the set-top box of the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings and specific embodiments so as to more clearly understand the technical idea claimed in the invention.
The utility model relates to a polarization control circuit of set-top box as shown in fig. 1, which comprises a resistor R, a triode Q, a resistor R, a triode Q, a capacitor C, an adjustable voltage stabilizer U, a resistor R, a capacitor C, a diode D, a resistor R, a triode Q and a resistor R, wherein one end of the resistor R is connected with a main board power input end, the other end of the resistor R is connected with a base electrode of the triode Q, a collector electrode of the triode Q is connected with the resistor R and one end of the resistor R, an emitter electrode of the triode Q is connected with a collector electrode of the triode Q, the other end of the resistor R, one end of the resistor R and one end of the capacitor C, a base electrode of the triode Q is connected with one end of the resistor R, the other end of the resistor R is connected with a signal terminal F22, an emitter electrode of the triode Q is connected with the other end of the resistor R and the other end of the capacitor C and is grounded, the other end of the resistor R3 is connected to an ADJ pin of the adjustable regulator U1, one end of the resistor R6, one end of the capacitor C2, and a collector of the transistor Q3, the adjustable regulator U1 is specifically an LM317 adjustable three-terminal anode regulator, the other end of the capacitor C2 is grounded, an emitter of the transistor Q3 is grounded, a base of the transistor Q3 is connected to one end of the resistor R8, the other end of the resistor R8 is connected to an LNB-EN pin, the other end of the resistor R6 is connected to a Vout pin of the adjustable regulator U1, a positive electrode of the diode D1, and one end of the capacitor C3, the other end of the capacitor C3 is grounded, a negative electrode of the diode D1 is connected to one end of the resistor R7, the other end of the resistor R7 is grounded, and a Vin pin of the adjustable regulator U1 is connected to a 22V power supply; the circuit is simple in structure and design, can be also suitable for polarization processing of program signals of the set top box, has fewer easily-failed circuit components, and has lower failure rate compared with the polarization control circuit which is complex in structure and design in the prior art.
Various other changes and modifications may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such changes and modifications should fall within the scope of the present invention.
Claims (2)
1. A set-top box polarization control circuit, characterized by: the circuit comprises a resistor R1, a triode Q1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a triode Q2, a capacitor C1, an adjustable voltage regulator U1, a resistor R6, a capacitor C2, a capacitor C3, a diode D1, a resistor R7, a triode Q3 and a resistor R8, wherein one end of the resistor R1 is connected with a main board power input end 13/18, the other end of the resistor R1 is connected with the base of the triode Q1, the collector of the triode Q1 is connected with the resistor R2 and one end of the resistor R3, the emitter of the triode Q1 is connected with the collector of the triode Q2, the other end of the resistor R2, one end of the resistor R4 and one end of the capacitor C1, the base of the triode Q2 is connected with one end of the resistor R5, the other end of the resistor R5 is connected with a signal terminal F22 5, and the emitter of the triode Q5 is connected with the other end of the capacitor C5 and the capacitor C5, the other end of the resistor R3 is connected with an ADJ pin of the adjustable voltage regulator U1, one end of the resistor R6, one end of the capacitor C2 and a collector of the triode Q3, the other end of the capacitor C2 is grounded, an emitter of the triode Q3 is grounded, a base of the triode Q3 is connected with one end of the resistor R8, the other end of the resistor R8 is connected with an LNB-EN pin, the other end of the resistor R6 is connected with a Vout pin of the adjustable voltage regulator U1, a positive electrode of the diode D1 and one end of the capacitor C3, the other end of the capacitor C3 is grounded, a negative electrode of the diode D1 is connected with one end of the resistor R7, the other end of the resistor R7 is grounded, and a pin of the adjustable voltage regulator U1 is connected with a 22V power supply.
2. The set-top box polarization control circuit of claim 1, wherein: the adjustable voltage stabilizer U1 is an LM317 adjustable three-terminal anode voltage stabilizer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023059730.9U CN213817965U (en) | 2020-12-18 | 2020-12-18 | Polarization control circuit of set top box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023059730.9U CN213817965U (en) | 2020-12-18 | 2020-12-18 | Polarization control circuit of set top box |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213817965U true CN213817965U (en) | 2021-07-27 |
Family
ID=76947116
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023059730.9U Active CN213817965U (en) | 2020-12-18 | 2020-12-18 | Polarization control circuit of set top box |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213817965U (en) |
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2020
- 2020-12-18 CN CN202023059730.9U patent/CN213817965U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: The fourth floor of Building 5 #, Phase III, Zhongxi Industrial Park, No. 912 Binhu Road, Zhangban Town, Quanzhou Taishang Investment Zone, Quanzhou City, Fujian Province, 362100 Patentee after: Quanzhou Yingchuang Electronics Co.,Ltd. Address before: The fourth floor of Building 5 #, Phase III, Zhongxi Industrial Park, No. 912 Binhu Road, Zhangban Town, Quanzhou Taishang Investment Zone, Quanzhou City, Fujian Province, 362100 Patentee before: Quanzhou Yingchuang Electronic Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder |