CN103179458B - A kind of Set Top Box and antenna supply module thereof - Google Patents
A kind of Set Top Box and antenna supply module thereof Download PDFInfo
- Publication number
- CN103179458B CN103179458B CN201310097331.7A CN201310097331A CN103179458B CN 103179458 B CN103179458 B CN 103179458B CN 201310097331 A CN201310097331 A CN 201310097331A CN 103179458 B CN103179458 B CN 103179458B
- Authority
- CN
- China
- Prior art keywords
- resistance
- antenna
- type triode
- top box
- set top
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Details Of Aerials (AREA)
Abstract
The invention belongs to TV technology, particularly relate to a kind of Set Top Box and antenna supply module thereof.Set Top Box antenna supply module provided by the invention; relatively simple for structure, comprising the size for limiting output current, ensureing the flow-restriction that normally works of Set Top Box and connecting with flow-restriction and supply power voltage simultaneously, from when power initiation, real-time guard is carried out to the short circuit of antenna, at once can close the short-circuit protection unit that antenna powers.According to Set Top Box provided by the invention and antenna supply module thereof; at the beginning of main power source starts to the current detecting unit of antenna also do not start during this period of time in also can carry out short-circuit protection; and the size of the real-time control antenna output current of energy; thus avoid and cause Set Top Box itself normally to work because output current is excessive, improve the reliability of related hardware.
Description
Technical field
The invention belongs to TV technology, particularly relate to a kind of Set Top Box and antenna supply module thereof.
Background technology
The short-circuit protection of antenna is the function that Set Top Box must have, and main cause is because the plug of Set Top Box active antenna is easy to cause overcurrent or short circuit, therefore generally will have the method for carrying out current detecting and short-circuit protection accordingly.
Existing Set Top Box antenna protection; generally all only have short-circuit protection function, and, at the beginning of main power source starts; current detecting unit due to antenna does not also have enough time start therefore real-time antenna short circuit can not be detected, and Set Top Box also will be caused normally not start.Further, user also cannot judge which kind of state is Set Top Box be in, and easily burns out the electronic devices such as the master chip of Set Top Box.
Summary of the invention
In view of above-mentioned technical problem; first object of the present invention is the supply module providing a kind of Set Top Box antenna, is intended to solve existing Set Top Box antenna supply module and cannot control effectively to the size of output current and be opened to the technical problem cannot carrying out short-circuit protection in the time period of antenna detection unit unlatching at main power source.
To achieve these goals, the technical solution adopted in the present invention is:
An antenna supply module for Set Top Box, comprising:
The one end be connected with supply power voltage with described antenna connects, for limit output current size, ensure the flow-restriction that normally works of Set Top Box; And
Connect with described flow-restriction, from when power initiation, the short circuit of described antenna is carried out to real-time guard, at once closed the antenna short-circuit protection unit of powering.
As improvement; in order to improve the reliability of circuit; the antenna supply module of Set Top Box provided by the invention can also comprise be connected between described flow-restriction and described short-circuit protection unit, when the under-voltage or short circuit of the power supply of described antenna being detected, control to close the detecting unit that antenna is powered.
Another object of the present invention is also to provide a kind of Set Top Box, and as improvement, described Set Top Box have employed the antenna supply module of above-mentioned arbitrary form.
Set Top Box provided by the invention and antenna supply module thereof; relatively simple for structure; at the beginning of main power source starts to the current detecting unit of antenna also do not start during this period of time in also can carry out short-circuit protection; and the size of the real-time control antenna output current of energy; avoid causing because output current is excessive Set Top Box itself normally to work, improve the reliability of related hardware.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the Set Top Box antenna supply module that first embodiment of the invention provides;
Fig. 2 is the exemplary electron components and parts figure of the Set Top Box antenna supply module that first embodiment of the invention provides;
Fig. 3 is the structured flowchart of the Set Top Box antenna supply module that second embodiment of the invention provides;
Fig. 4 is the exemplary electron components and parts figure of the Set Top Box antenna supply module that second embodiment of the invention provides.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Fig. 1 is the structured flowchart of the Set Top Box antenna supply module that first embodiment of the invention provides; For convenience of explanation, illustrate only part related to the present embodiment, as shown in the figure:
The Set Top Box antenna supply module that first embodiment of the invention provides, comprises flow-restriction 10 and short-circuit protection unit 20; Flow-restriction 10 and short-circuit protection unit 20 connect with supply voltage VCC respectively, flow-restriction 10 is connected to one end (other end ground connection of antenna Z) that antenna Z connects with antenna supply power voltage AntennaPower, for limiting the size of the output current of antenna Z, prevent the normal work that output current is excessive, supply voltage VCC is affected Set Top Box itself by too dragging down; Short-circuit protection unit 20 is connected between flow-restriction 10 and supply power voltage AntennaPower; when there is antenna short circuit; real-time cut out antenna powers; it should be noted that; this short-circuit protection unit 20 just can provide real-time guard at the beginning of supply voltage VCC starts; can not can not realize defencive function because other Function detection unit in Set Top Box not yet start, improve the reliability of hardware protection.
Fig. 2 shows the exemplary electron components and parts combination of the Set Top Box antenna supply module that first embodiment of the invention provides; For convenience of explanation, illustrate only part related to the present embodiment.As a preferred embodiment, as shown in the figure:
Flow-restriction 10 comprises PNP type triode Q1, PNP type triode Q2, resistance R1, resistance R2 and resistance R3, the collector electrode of PNP type triode Q2 connects one end that antenna Z connects with supply power voltage AntennaPower, the emitter first end of connecting resistance R1 and the first end of resistance R2 simultaneously of PNP type triode Q2, second end of resistance R1 meets emitter and the supply voltage VCC of PNP type triode Q1 simultaneously, the base stage of the second termination PNP type triode Q1 of resistance R2, the collector electrode of PNP type triode Q1 and the base stage of PNP type triode Q2 are connected together as the output of flow-restriction 10 altogether, connect with short-circuit protection unit 20, resistance R3 is connected between the base stage of PNP type triode Q1 and ground.
Short-circuit protection unit 20 comprises NPN type triode Q3, diode D1, resistance R4, resistance R5, resistance R6 and resistance R7; Resistance R4, resistance R5 are connected in turn between operating voltage VCC and the collector electrode of NPN type triode Q3, the common contact that resistance R4 connects with resistance R5 connects flow-restriction 10, the base stage of NPN type triode Q3 connects the anode of diode D1 and the first end of resistance R6 simultaneously, the negative electrode of diode D1 meets the supply power voltage AntennaPower of antenna Z, second end of resistance R6 connects the grounded emitter of upper pull-up voltage VDD, a NPN type triode Q3 by resistance R7.
Below according to the Set Top Box antenna supply module that this first embodiment provides, the diode D1 adopting germanium material for diode D1, is briefly described the operation principle of two circuit units.
In normal operation, NPN type triode Q3 and PNP type triode Q2 is conducting, and PNP type triode Q1 cut-off.Assuming that supply voltage VCC powers as 5V, Set Top Box loading range are 32 ohm to 75 ohm, maximum output current is therefore needed to be about 150mA; If output current continues to increase, then 5V voltage may be caused to be dragged down, affect Set Top Box normally work itself.
For flow-restriction 10, suppose: antenna supply power voltage AntennaPower is U4, the impedance of antenna load is Z, then the electric current flowing through antenna Z is then: I=U4/Z; The voltage of PNP type triode Q2 emitter is U2, then the voltage U 1 flowing through resistance R1 is: U1=5V-U2; The voltage of PNP type triode Q1 base stage is U3; According to following two relational expressions
Formula 1:U4/Z=U1/R1
Formula 2:U3=U2*R3/ (R2+R3)
Known: along with the increase of electric current I, U2 declines, and U3 declines, PNP type triode Q1 conducting; Pressure reduction after PNP type triode Q1 conducting between BE is about 0.7V, and at this moment U3 voltage is clamped down on, and that is U2 is in definite value; U1 is constant, and therefore U4/Z is also in definite value, and this electric current is maximum current pattern.(when specific implementation, when electric current reaches 150mA, after resistance R1 step-down, resistance R2 and resistance R3 dividing potential drop, pressure reduction between the BE of PNP type triode Q1 just can be made to be about 0.7V, the resistance of resistance R1, resistance R2 and resistance R3 can be determined thus.) now PNP type triode Q1 be in critical conduction mode, and PNP type triode Q2 saturation conduction.
The flow-restriction 10 adopting this embodiment to provide can protect Set Top Box itself, and Set Top Box can not be caused because output current is excessive normally to work.
Client, when using Set Top Box, there will be the situation of antenna short circuit unavoidably, at this time very large to the loss of the PNP type triode Q2 in flow-restriction 10, just needs to increase some hardware protection devices-i.e. short-circuit protection unit 20.At this, diode D1(germanium tube) base voltage of NPN type triode Q3 is limited in 0.3V, cause NPN type triode Q3 to end, and then cause PNP type triode Q2 to close not conducting, thus close the power supply of antenna, allow PNP type triode Q2 be in cut-off state completely.
Apply this short-circuit protection unit 20; real-time antenna short circuit protection just can be provided at the beginning of supply voltage VCC starts; can not can not realize defencive function because other Function detection unit in Set Top Box not yet start, further increase the reliability of hardware protection.
As improvement, Set Top Box antenna supply module provided by the invention can also increase a detecting unit 30 on the basis of the first embodiment: when detecting unit 30 detects the under-voltage or short circuit of power supply, can control to stop antenna powering.Namely Fig. 3 is the structured flowchart of the Set Top Box antenna supply module that this second embodiment of the present invention provides; as shown in the figure: newly-increased detecting unit 30 is connected between flow-restriction 10 and short-circuit protection unit 20; when under-voltage the or short circuit of the power supply of antenna being detected by the mode of software and hardware combining, control the power supply of closing antenna.
Fig. 4 shows the exemplary electron components and parts composition of the Set Top Box antenna supply module that second embodiment of the invention provides.As shown in Figure 4:
Detecting unit 30 comprises master chip U1, NPN type triode Q4, resistance R8, resistance R9 and resistance R10; The first termination flow-restriction 10 of resistance R8 and the common contact of antenna Z; the base stage of the second termination NPN type triode Q4 of resistance R8; resistance R9 is connected between the base stage of NPN type triode Q4 and ground; the collector electrode of NPN type triode Q4 connects pull-up voltage VDD by resistance R10; the collector electrode of NPN type triode Q4 meets the voltage sense pin OverLoad of master chip U1 simultaneously; the control output pin AntCTRL of master chip U1 connects the common contact of resistance R6 and resistance R7 in short-circuit protection unit 20, the grounded emitter of NPN type triode Q4.
In specific implementation process, when the software-controllable of master chip U1, the bleeder circuit formed using resistance R8, resistance R9 and NPN type triode Q4 are as detecting factor.When voltage is normal, NPN type triode Q4 is conducting, and the collector electrode output low level of NPN type triode Q4 is to the voltage sense pin OverLoad of master chip U1; When the supply power voltage of antenna is under-voltage, by after resistance R8, resistance R9 dividing potential drop, make the base voltage of NPN type triode Q4 be less than 0.7V time, NPN type triode Q4 will end, and collector electrode just exports the voltage sense pin OverLoad of high level to master chip U1.Now; after master chip U1 detects high level; by controlling the common contact of resistance R6 and resistance R7 in output pin AntCTRL output low level to short-circuit protection unit 20; NPN type triode Q3 is ended; and then cause PNP type triode Q2 to close not conducting, thus close the supply network of antenna.Certainly, different install and use environment under, the size of under-voltage can adjust according to the resistance of resistance R8 and resistance R9.
The embodiment of the present invention also provides a kind of Set Top Box, and described Set Top Box have employed the antenna supply module of above-mentioned arbitrary form.
In sum; Set Top Box provided by the invention and antenna supply module thereof; relatively simple for structure; at the beginning of main power source starts to the current detecting unit of antenna also do not start during this period of time in also can carry out short-circuit protection; and the size of the real-time control antenna output current of energy; thus avoid and cause Set Top Box itself normally to work because output current is excessive, improve the reliability of related hardware.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, although with reference to previous embodiment to invention has been comparatively detailed description, for a person skilled in the art, it still can be modified to the technical scheme described in foregoing embodiments or carry out equivalent replacement to wherein portion of techniques feature.All any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. an antenna supply module for Set Top Box, is characterized in that, described supply module comprises:
The one end connecing supply power voltage with described antenna is connected, for limit output current size, ensure the flow-restriction that normally works of Set Top Box; And
Connect with described flow-restriction and supply power voltage simultaneously, from when power initiation, real-time guard is carried out to the short circuit of described antenna, at once can close the short-circuit protection unit that antenna powers;
Wherein, described flow-restriction comprises: PNP type triode Q1, PNP type triode Q2, resistance R1, resistance R2 and resistance R3, the collector electrode of described PNP type triode Q2 connects one end that described antenna connects with supply power voltage, the emitter of described PNP type triode Q2 connects the first end of described resistance R1 and the first end of resistance R2 simultaneously, second end of described resistance R1 meets emitter and the supply voltage VCC of described PNP type triode Q1 simultaneously, the base stage of PNP type triode Q1 described in second termination of described resistance R2, the collector electrode of described PNP type triode Q1 and the base stage of described PNP type triode Q2 are connected together as the output of described flow-restriction altogether, connect with described short-circuit protection unit, between the base stage that described resistance R3 is connected to described PNP type triode Q1 and ground,
Described short-circuit protection unit comprises: NPN type triode Q3, diode D1, resistance R4, resistance R5, resistance R6 and resistance R7; Described resistance R4, resistance R5 are connected in turn between the collector electrode of operating voltage VCC and described NPN type triode Q3, the common contact that described resistance R4 connects with resistance R5 connects described flow-restriction, the base stage of described NPN type triode Q3 connects the anode of described diode D1 and the first end of described resistance R6 simultaneously, the negative electrode of described diode D1 connects the supply power voltage of antenna, second end of described resistance R6 connects a upper pull-up voltage by described resistance R7, the grounded emitter of described NPN type triode Q3.
2. the antenna supply module of Set Top Box as claimed in claim 1, is characterized in that, described diode D1 is the diode D1 adopting germanium material.
3. the antenna supply module of Set Top Box as claimed in claim 1, it is characterized in that, described supply module also comprises:
Being connected between described flow-restriction and described short-circuit protection unit, when the under-voltage or short circuit of the power supply of described antenna being detected, controlling to close the detecting unit that antenna is powered.
4. the antenna supply module of Set Top Box as claimed in claim 3, it is characterized in that, described detecting unit comprises: master chip U1, NPN type triode Q4, resistance R8, resistance R9 and resistance R10;
The common contact of flow-restriction and antenna described in first termination of described resistance R8, the base stage of NPN type triode Q4 described in second termination of described resistance R8, between the base stage that described resistance R9 is connected on described NPN type triode Q4 and ground, the collector electrode of described NPN type triode Q4 connects pull-up voltage by described resistance R10, the collector electrode of described NPN type triode Q4 connects the voltage sense pin of described master chip U1 simultaneously, the control output pin of described master chip U1 connects in described short-circuit protection unit, the common contact of described resistance R6 and resistance R7, the grounded emitter of described NPN type triode Q4.
5. a Set Top Box, is characterized in that: described Set Top Box comprises antenna and the antenna supply module as described in any one of claim 1-4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310097331.7A CN103179458B (en) | 2013-03-25 | 2013-03-25 | A kind of Set Top Box and antenna supply module thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310097331.7A CN103179458B (en) | 2013-03-25 | 2013-03-25 | A kind of Set Top Box and antenna supply module thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103179458A CN103179458A (en) | 2013-06-26 |
| CN103179458B true CN103179458B (en) | 2016-04-20 |
Family
ID=48639029
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310097331.7A Expired - Fee Related CN103179458B (en) | 2013-03-25 | 2013-03-25 | A kind of Set Top Box and antenna supply module thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103179458B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105468078A (en) * | 2015-12-30 | 2016-04-06 | 马瑞利汽车电子(广州)有限公司 | Active current limiting circuit with no branches leaking currents |
| CN109935950B (en) * | 2018-08-29 | 2024-03-15 | 浙江科比特科技有限公司 | Antenna power supply circuit and antenna |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5969928A (en) * | 1997-12-03 | 1999-10-19 | Gould Electronics Inc. | Shunt for circuit protection device |
| CN201075824Y (en) * | 2007-08-14 | 2008-06-18 | 青岛海信电器股份有限公司 | Antenna feeding circuit |
| CN101282439A (en) * | 2007-12-29 | 2008-10-08 | 青岛海信电器股份有限公司 | Power supply system for antenna |
| CN102064517A (en) * | 2010-08-24 | 2011-05-18 | 深圳市九洲电器有限公司 | Set top box and antenna short circuit protection module thereof |
| CN102611861A (en) * | 2012-02-27 | 2012-07-25 | 厦门华侨电子股份有限公司 | Antenna power supply device with accurate current control function on television and power supply method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI309493B (en) * | 2006-04-28 | 2009-05-01 | Hon Hai Prec Ind Co Ltd | Inrush current limiting circuit and power supply device using the same |
-
2013
- 2013-03-25 CN CN201310097331.7A patent/CN103179458B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5969928A (en) * | 1997-12-03 | 1999-10-19 | Gould Electronics Inc. | Shunt for circuit protection device |
| CN201075824Y (en) * | 2007-08-14 | 2008-06-18 | 青岛海信电器股份有限公司 | Antenna feeding circuit |
| CN101282439A (en) * | 2007-12-29 | 2008-10-08 | 青岛海信电器股份有限公司 | Power supply system for antenna |
| CN102064517A (en) * | 2010-08-24 | 2011-05-18 | 深圳市九洲电器有限公司 | Set top box and antenna short circuit protection module thereof |
| CN102611861A (en) * | 2012-02-27 | 2012-07-25 | 厦门华侨电子股份有限公司 | Antenna power supply device with accurate current control function on television and power supply method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103179458A (en) | 2013-06-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204965104U (en) | Air conditioner and last electricity and current foldback circuit of intelligence power module thereof | |
| CN102820638B (en) | Overcurrent protection device and electronic equipment | |
| CN205751476U (en) | A kind of power supply circuits of OLED display screen | |
| WO2018126790A1 (en) | Circuit protection circuit and method, and power supply cable | |
| CN205753636U (en) | A kind of power-down protection circuit | |
| CN104218558A (en) | Surge-prevention high-voltage protection circuit | |
| CN206211502U (en) | A kind of new locked protection circuit of positive feedback output overvoltage | |
| CN103179458B (en) | A kind of Set Top Box and antenna supply module thereof | |
| CN203800576U (en) | Protection circuit of overcurrent and under current for MOS transistor output | |
| CN109613968A (en) | Power supply redundant output circuit with short-circuit protection | |
| CN206272332U (en) | A kind of power control circuit | |
| CN202495738U (en) | Undervoltage protection circuit | |
| CN204738991U (en) | Fan control and protection circuit | |
| CN106253375A (en) | A kind of electronic terminal charge protection circuit and electric terminal | |
| CN207652028U (en) | A kind of switching power circuit and its protection circuit | |
| CN207625287U (en) | A kind of self-healing LED switch power circuit of short-circuit protection | |
| CN205986096U (en) | Voltage protection circuit | |
| CN206401879U (en) | Input undervoltage protection circuit for DC DC | |
| CN106774589B (en) | Stable-pressure device and guard method, communication bus power supply device | |
| CN205721214U (en) | A kind of intelligent soy milk grinder control circuit | |
| CN205016987U (en) | BMS activates circuit | |
| CN107093886A (en) | It is a kind of to be embedded in solar powered network from the voltage security power supply circuit become in device | |
| CN106774795A (en) | Mobile terminal and its power-supply management system | |
| CN208753973U (en) | A kind of low level triggering latching circuit | |
| CN209462558U (en) | A kind of power-off restoration device and earphone, speaker |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information |
Inventor after: Yang Fudong Inventor after: Xue Wei Inventor before: Xue Wei |
|
| COR | Change of bibliographic data | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160420 Termination date: 20200325 |