CN200983618Y - Ground STB antenna power supply circuit - Google Patents
Ground STB antenna power supply circuit Download PDFInfo
- Publication number
- CN200983618Y CN200983618Y CNU2006200166277U CN200620016627U CN200983618Y CN 200983618 Y CN200983618 Y CN 200983618Y CN U2006200166277 U CNU2006200166277 U CN U2006200166277U CN 200620016627 U CN200620016627 U CN 200620016627U CN 200983618 Y CN200983618 Y CN 200983618Y
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- Prior art keywords
- ground
- power supply
- top box
- circuit
- antenna
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Abstract
The utility model discloses a power supply circuit for a ground set-top box antenna, comprising a switching circuit for controlling an antenna power switch and a voltage stabilizing circuit for supplying power to the antenna, wherein the output terminal of the switching circuit is electrically connected with the input terminal of the voltage stabilizing circuit. The power supply circuit for a ground set-top box antenna of the utility model not only satisfies the need that users can determine whether or not to supply power to the antenna but also is of a simple circuit and convenient operation.
Description
Technical field
The utility model relates to a kind of power supply circuits, especially Ground-type set-top box,antenna power supply circuit.
Background technology
Antenna divides active and passive two kinds in the terrestrial set top box at present, and active antenna needs the outside to provide power supply to it, and passive antenna does not then need.In the application in the past, set-top box does not provide optional function of supplying power to exterior antenna, and when set-top box did not provide function of supplying power, the user just can only use passive antenna; When set-top box provided function of supplying power, the user just can only use active antenna.But each place even each family wish that the antenna that uses may be all different, so there is significant limitation in the application of set-top box, can not satisfy user's different needs.
The utility model content
The utility model is exactly in order to overcome above deficiency, has proposed a kind ofly can satisfy the user selectively to the Ground-type set-top box,antenna power supply circuit of the needs of antenna power supply.
For achieving the above object, Ground-type set-top box,antenna power supply circuit of the present utility model comprises the switching circuit of a control antenna mains switch and the voltage stabilizing circuit that antenna is powered, and the switching circuit output is electrically connected with the voltage stabilizing circuit input.
Preferably, can also be connected in series divider resistance with the voltage stabilizing circuit input at the switching circuit output.
Adopted such Ground-type set-top box,antenna power supply circuit, not only satisfied the user and can select needs that antenna is powered, and circuit has been simple, easy to operate.Especially be connected in series divider resistance at the switching circuit output with the voltage stabilizing circuit input, cooperate the function that can play output short circuit protection with voltage stabilizing circuit.
Feature of the present utility model and advantage will be elaborated in conjunction with the accompanying drawings by embodiment.
Description of drawings
Fig. 1 is the power supply circuit construction figure of the utility model embodiment.
Embodiment
Embodiment of the present utility model consults Fig. 1, and the set-top box master chip is realized the break-make of supply power voltage by GPIO (GeneralPurpose Input/Output, general I/O) mouthful of unlatching and shutoff that comes control switch circuit 1.Supply power voltage outputs to antenna through voltage stabilizing circuit 2.
As shown in Figure 1, switching circuit 1 has comprised the first triode Q1, the second triode Q2.Antenna power control signal (ANT_SW) is a GPIO mouth of set-top box master chip, links to each other with the base stage of the first triode Q1 by first resistance R 1, is connected to ground by second resistance R 2; The emitter of the first triode Q1 directly is connected with ground, and collector electrode links to each other with the emitter of the second triode Q2 by the 3rd resistance R 3, links to each other with the base stage of the second triode Q2 by the 4th resistance R 4; The emitter of the second triode Q2 is connected on the power supply, and collector electrode is connected to the input of the three terminal regulator U1 in the voltage stabilizing circuit 2 by two series connection divider resistance R5, R6; The three terminal regulator U1 that adopts in the present embodiment is 78L05; The common end grounding of three terminal regulator U1, input is by the first filter capacitor C1 ground connection, output is antenna power supply (ANT_POWER) pin that aerial voltage output (ANT_VOUT) is connected to tuner (TUNER), by two shunt capacitance second filter capacitor C2 and the 3rd filter capacitor CE1 ground connection, the positive pole of the 3rd filter capacitor CE1 links to each other with the output of three terminal regulator U1 simultaneously.
This circuit working principle is as follows:
When ground set-top box tuner external antenna was active antenna, set-top box provided power supply to antenna.At this moment, the antenna power control signal is a high level, the first triode Q1 conducting, and its collector voltage is a low level, therefore the base voltage of the second triode Q2 also is a low level, the second triode Q2 conducting, the stable voltage of three terminal regulator U1 output is given antenna.
When ground set-top box tuner external antenna was passive antenna, set-top box did not need to power to antenna.At this moment, the antenna power control signal is a low level, and the first triode Q1 ends, and its collector voltage is a high level, and the base voltage of such second triode Q2 also is a high level, and the second triode Q2 ends, three terminal regulator U1 no-output voltage.
Wherein, divider resistance R5, R6 are used for adjusting the input voltage of three terminal regulator U1, and the first filter capacitor C1, the second filter capacitor C2, the 3rd filter capacitor CE1 carry out filtering to the input and output voltage of three terminal regulator U1.
When voltage stabilizing circuit 2 output shorted to earths; electric current increases; because three terminal regulator U1 inside has the streaming of subtracting protective circuit; add R5; the dividing potential drop effect of R6, the input voltage of three terminal regulator U1 will be limited in about 4V, and output current is about 85mA; thereby therefore the power consumption constraints that makes three terminal regulator U1 has effectively protected other circuit of three terminal regulator U1 and set-top box inside in allowed band.Have only the circuit output end of pressure-stabilizing of working as to recover just often, U1 could recover operate as normal.
The utility model has been realized the antenna power supply optional function of terrestrial set top box by adopting above-mentioned simple circuit configuration, and simple to operate, and the user can need select power supply by remote controller, is user-friendly to various antenna.Simultaneously, when the careless short circuit of output voltage terminal, this circuit has the output short circuit protection function, can not damage set-top box.
Above content be in conjunction with concrete preferred implementation to further describing that the utility model is done, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, under the prerequisite that does not break away from the utility model design, can also make some simple deduction or replace, all should be considered as belonging to protection range of the present utility model.
Claims (10)
1. Ground-type set-top box,antenna power supply circuit, it is characterized in that, comprise the switching circuit (1) of a control antenna mains switch and the voltage stabilizing circuit (2) that antenna is powered, described switching circuit (1) output is electrically connected with described voltage stabilizing circuit (2) input.
2. Ground-type set-top box,antenna power supply circuit as claimed in claim 1 is characterized in that, also be serially connected with between described switching circuit (1) and the described voltage stabilizing circuit (2) divider resistance (R5, R6).
3. Ground-type set-top box,antenna power supply circuit as claimed in claim 1 or 2 is characterized in that, described voltage stabilizing circuit (2) is three terminal regulator (U1).
4. Ground-type set-top box,antenna power supply circuit as claimed in claim 3, it is characterized in that, also and be connected to second filter capacitor (C2) and the 3rd filter capacitor (CE1), the positive pole of described the 3rd filter capacitor (CE1) links to each other with the output of three terminal regulator (U1) between described three terminal regulator (U1) output and the ground.
5. Ground-type set-top box,antenna power supply circuit as claimed in claim 3 is characterized in that, goes back and be connected to first filter capacitor (C1) between described three terminal regulator (U1) input and the ground.
6. Ground-type set-top box,antenna power supply circuit as claimed in claim 1 or 2, it is characterized in that, described switching circuit (1) comprises first triode (Q1) and second triode (Q2), the base stage of described first triode (Q1) is electrically connected with master chip antenna power control signal end, collector electrode is electrically connected grounded emitter with the base stage and the emitter of described second triode (Q2); The emitter of described second triode (Q2) links to each other with power supply, and collector electrode is connected with voltage stabilizing circuit (2) input.
7. Ground-type set-top box,antenna power supply circuit as claimed in claim 6 is characterized in that, the base stage of described first triode (Q1) is connected with master chip antenna power control signal end by first resistance (R1).
8. Ground-type set-top box,antenna power supply circuit as claimed in claim 7 is characterized in that, described first resistance (R1) passes through second resistance (R2) ground connection with master chip antenna power control signal end.
9. Ground-type set-top box,antenna power supply circuit as claimed in claim 6 is characterized in that, the collector electrode of described first triode (Q1) is connected with the emitter of second triode (Q2) by the 3rd resistance (R3).
10. Ground-type set-top box,antenna power supply circuit as claimed in claim 6 is characterized in that, the collector electrode of described first triode (Q1) is connected with the base stage of second triode (Q2) by the 4th resistance (R4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006200166277U CN200983618Y (en) | 2006-12-20 | 2006-12-20 | Ground STB antenna power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006200166277U CN200983618Y (en) | 2006-12-20 | 2006-12-20 | Ground STB antenna power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN200983618Y true CN200983618Y (en) | 2007-11-28 |
Family
ID=38910767
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2006200166277U Expired - Fee Related CN200983618Y (en) | 2006-12-20 | 2006-12-20 | Ground STB antenna power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN200983618Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111536756A (en) * | 2020-05-21 | 2020-08-14 | 四川虹美智能科技有限公司 | Control apparatus for refrigerator |
-
2006
- 2006-12-20 CN CNU2006200166277U patent/CN200983618Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111536756A (en) * | 2020-05-21 | 2020-08-14 | 四川虹美智能科技有限公司 | Control apparatus for refrigerator |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Shenzhen Coship Software Co., Ltd. Assignor: Shenzhen Tongzhou Electronic Co., Ltd. Contract fulfillment period: 2006.12.30 to 2016.12.20 Contract record no.: 2008990000909 Denomination of utility model: Ground STB antenna power supply circuit Granted publication date: 20071128 License type: Exclusive license Record date: 20081023 |
|
| LIC | Patent licence contract for exploitation submitted for record |
Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2006.12.30 TO 2016.12.20; CHANGE OF CONTRACT Name of requester: SHENZHEN CITY TONGZHOU SOFTWARE CO., LTD. Effective date: 20081023 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20071128 Termination date: 20141220 |
|
| EXPY | Termination of patent right or utility model |