CN104113779B - Detection protection method for LNB power supply circuit in satellite television set top box - Google Patents
Detection protection method for LNB power supply circuit in satellite television set top box Download PDFInfo
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- CN104113779B CN104113779B CN201410324795.1A CN201410324795A CN104113779B CN 104113779 B CN104113779 B CN 104113779B CN 201410324795 A CN201410324795 A CN 201410324795A CN 104113779 B CN104113779 B CN 104113779B
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- 238000001514 detection method Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000005070 sampling Methods 0.000 claims abstract description 75
- 238000006243 chemical reaction Methods 0.000 claims abstract description 8
- 230000002159 abnormal effect Effects 0.000 claims description 14
- 230000005611 electricity Effects 0.000 claims description 8
- 230000000630 rising effect Effects 0.000 claims description 7
- 230000005856 abnormality Effects 0.000 description 3
- 230000008030 elimination Effects 0.000 description 3
- 238000003379 elimination reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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- Television Receiver Circuits (AREA)
- Circuits Of Receivers In General (AREA)
Abstract
The invention discloses a detection and protection method of an LNB power supply circuit in a satellite television set top box, belonging to the LNB power supply protection of the satellite television set top box. The technical scheme is as follows: the sampling circuit is adopted to carry out overcurrent and short circuit detection on the LNB power supply circuit, and an interrupt signal generated by the sampling circuit is output to an interrupt pin of a CPU of the satellite television set top box through the level conversion circuit to trigger an interrupt service program; the sampling circuit mainly comprises a sampling triode and a sampling resistor, a level conversion circuit from an LNB power supply circuit to a CPU IO port is arranged behind the sampling triode, and the level conversion circuit mainly comprises a triode and a biasing resistor.
Description
Technical field
The present invention relates to the LNB power supply protection of a kind of satellite TV set-top boxes, specifically a kind of satellite TV set top
The detection guard method of LNB power supply circuits in box.
Background technology
Satellite TV set-top boxes is a kind of for receiving satellite digital television signal and changing into high-quality audio frequency and video letter
Number output equipment, be one can allow user on existing simulated television, viewing install satellite television programming, interact formula
Digitized amusement, education and the consumption industry electronic product of commercialization activity.
LNB(low noise block downconverter) it is exactly low news frequency reducing amplifier, its function is by by feed
The satellite-signal transmitted, through amplifying and frequency conversion, becomes Ku or C-band signal into L(950MHz-2150MHz) wave band, through coaxial
Cable sends satellite TV set-top boxes to.
In recent years, domestic digital satellite television receiver price is the fiercest, and each producer is in order to dominate the market, by various
Approach reduces product cost, provides practicality and product at a low price for consumer.During reduced cost, there are many companies
Sight is put on LNB power supply circuits, has used lower-cost LNB power supply plan.But the LNB power supply circuits of low cost are general
The most do not comprise short circuit, overcurrent protection function.During user uses, if because external cause causes LNB for electrical short or electricity
Stream moment increases, and can cause instantaneous large-current occur, cause satellite set top box power pack device to burn, for a long time short circuit or
Cross stream, satellite set top box power pack device even can be caused overheated, cause danger.
Summary of the invention
The technical assignment of the present invention is for above weak point, it is provided that a kind of cross LNB power supply circuits is flowed or short circuit
State carries out detection interrupt voltage protection in time, prevents the LNB power supply circuits of satellite TV set-top boxes because of short circuit or electric current
The detection guard method of LNB power supply circuits in a kind of satellite TV set-top boxes that moment increases and is burned out.
The technical solution adopted for the present invention to solve the technical problems is: use sample circuit to carry out LNB power supply circuits
Cross stream, short-circuit detecting, and the interrupt signal that sample circuit produces is exported satellite TV set-top boxes by level shifting circuit
The interrupt pin of CPU, trigger interrupt service routine；Sample circuit is mainly added sampling resistor by sampling audion and forms, sampling
Audion LNB power supply circuits disposed behind are to the level shifting circuit of CPU I/O port, and level shifting circuit is mainly by one
Audion is biased resistance composition；Comprise the steps:
(1), the operating current of LNB power supply circuits flows through the voltage that sampling resistor produces, the break-make of control sampling audion；
(2), when LNB power supply circuits normally work, sampling triode operation is in cut-off region；
(3), when LNB power supply circuits exception, sampling audion enters saturation region, and sampling audion produces interrupt signal；
(4), interrupt signal exported the interrupt pin of CPU of satellite TV set-top boxes by level shifting circuit, trigger
Interrupt service routine；
(5), entering after interrupt service routine, CPU first passes through I/O port and closes LNB power supply circuits；
(6), in the UI interface display fault cues information of satellite TV set-top boxes, prompting user's LNB power supply circuits are abnormal,
User please investigate fault.
When LNB power supply circuits normally work, operating current is less than 100mA, the voltage ＜ 0.7V that now sampling resistor produces,
Sampling triode operation is in cut-off region；When LNB power supply circuits occur abnormal, when operating current increases suddenly, on sampling resistor
Producing the voltage of ＞ 0.7V, sampling audion enters saturation region, and the colelctor electrode of sampling audion forms a rising edge voltage；This
Rising edge voltage exports the interrupt pin of the CPU of satellite TV set-top boxes as interrupt signal by level shifting circuit.
Interrupt service routine was opened LNB power supply circuits and exits interrupt service routine every 5 seconds；If LNB powers
Circuit abnormality Failure elimination, then remove the fault cues information in the UI interface of satellite TV set-top boxes, satellite TV set-top boxes
The most normally work；If LNB power supply circuits abnormal failure still suffers from, then sample circuit can send interrupt signal again to satellite electricity
Depending on the interrupt pin of the CPU of Set Top Box, satellite TV set-top boxes system is again introduced into interrupt service routine.
The sampling resistor using sample circuit is resistance RS1, resistance RS2, tri-parallel resistances of resistance RS3, above three
Parallel resistive circuit is connected between base stage and the emitter stage of sampling audion QN2；Level shifting circuit include audion QN4 and
The colelctor electrode of biasing resistor R4, sampling audion QN2 is connected to the base stage of audion QN4, and the colelctor electrode of audion QN4 is connected to
The interrupt pin of CPU；Biasing resistor R4 is connected to the prime outfan of LNB power supply circuits.
In a kind of satellite TV set-top boxes of the present invention, the detection guard method of LNB power supply circuits is compared to the prior art,
Have the advantage that
1, sample circuit carried out stream, short-circuit detecting to LNB power supply circuits, and the interrupt signal that sample circuit produces was led to
Over level change-over circuit exports the interrupt pin of the CPU of satellite TV set-top boxes, triggers interrupt service routine, effectively prevents
The LNB power supply circuits of satellite TV set-top boxes are burned out because of short-circuit or electric current moment increase；
2, interrupt service routine was opened LNB power supply circuits and exits interrupt service routine every 5 seconds；This step can
What the interference making moment caused crosses stream, the transient fault of short circuit, and after instantaneous eliminating, satellite TV set-top boxes system obtains extensive in time
Multiple；
3, sample circuit and level shifting circuit simple in construction, low cost of manufacture, practical.
Accompanying drawing explanation
The present invention is further described below in conjunction with the accompanying drawings.
Accompanying drawing 1 is the flow chart of the detection guard method of LNB power supply circuits in a kind of satellite TV set-top boxes；
Accompanying drawing 2 is sample circuit and the level of the detection guard method of LNB power supply circuits in a kind of satellite TV set-top boxes
The circuit diagram of change-over circuit.
Detailed description of the invention
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings.
Embodiment 1:
The detection guard method of LNB power supply circuits in a kind of satellite TV set-top boxes of the present invention, uses sample circuit pair
LNB power supply circuits carried out stream, short-circuit detecting, and the interrupt signal that sample circuit produces were exported by level shifting circuit
The interrupt pin of the CPU of satellite TV set-top boxes, triggers interrupt service routine；Sample circuit is mainly added sampling by sampling audion
Resistance forms, the level shifting circuit of sampling audion LNB power supply circuits disposed behind to CPU I/O port, level conversion electricity
Road is mainly biased resistance by an audion and forms；Comprise the steps:
(1), the operating current of LNB power supply circuits flows through the voltage that sampling resistor produces, the break-make of control sampling audion；
(2), when LNB power supply circuits normally work, sampling triode operation is in cut-off region；
(3), when LNB power supply circuits exception, sampling audion enters saturation region, and sampling audion produces interrupt signal；
(4), interrupt signal exported the interrupt pin of CPU of satellite TV set-top boxes by level shifting circuit, trigger
Interrupt service routine；
(5), entering after interrupt service routine, CPU first passes through I/O port and closes LNB power supply circuits；
(6), in the UI interface display fault cues information of satellite TV set-top boxes, prompting user's LNB power supply circuits are abnormal.
Embodiment 2:
The detection guard method of LNB power supply circuits in a kind of satellite TV set-top boxes of the present invention, uses sample circuit pair
LNB power supply circuits carried out stream, short-circuit detecting, and the interrupt signal that sample circuit produces were exported by level shifting circuit
The interrupt pin of the CPU of satellite TV set-top boxes, triggers interrupt service routine；Sample circuit is mainly added sampling by sampling audion
Resistance forms, the level shifting circuit of sampling audion LNB power supply circuits disposed behind to CPU I/O port, level conversion electricity
Road is mainly biased resistance by an audion and forms；Comprise the steps:
(1), the operating current of LNB power supply circuits flows through the voltage that sampling resistor produces, the break-make of control sampling audion；
(2), when LNB power supply circuits normally work, sampling triode operation is in cut-off region；
(3), when LNB power supply circuits exception, sampling audion enters saturation region, and sampling audion produces interrupt signal；
(4), interrupt signal exported the interrupt pin of CPU of satellite TV set-top boxes by level shifting circuit, trigger
Interrupt service routine；
(5), entering after interrupt service routine, CPU first passes through I/O port and closes LNB power supply circuits；
(6), in the UI interface display fault cues information of satellite TV set-top boxes, prompting user's LNB power supply circuits are abnormal.
When LNB power supply circuits normally work, operating current is less than 100mA, the voltage ＜ 0.7V that now sampling resistor produces,
Sampling triode operation is in cut-off region；When LNB power supply circuits occur abnormal, when operating current increases suddenly, on sampling resistor
Producing the voltage of ＞ 0.7V, sampling audion enters saturation region, and the colelctor electrode of sampling audion forms a rising edge voltage；This
Rising edge voltage exports the interrupt pin of the CPU of satellite TV set-top boxes as interrupt signal by level shifting circuit.
Interrupt service routine was opened LNB power supply circuits and exits interrupt service routine every 5 seconds；If LNB powers
Circuit abnormality Failure elimination, then remove the fault cues information in the UI interface of satellite TV set-top boxes, satellite TV set-top boxes
The most normally work；If LNB power supply circuits abnormal failure still suffers from, then sample circuit can send interrupt signal again to satellite electricity
Depending on the interrupt pin of the CPU of Set Top Box, satellite TV set-top boxes system is again introduced into interrupt service routine.
Embodiment 3:
The detection guard method of LNB power supply circuits in a kind of satellite TV set-top boxes of the present invention, uses sample circuit pair
LNB power supply circuits carried out stream, short-circuit detecting, and the interrupt signal that sample circuit produces were exported by level shifting circuit
The interrupt pin of the CPU of satellite TV set-top boxes, triggers interrupt service routine；Sample circuit is mainly added sampling by sampling audion
Resistance forms, the level shifting circuit of sampling audion LNB power supply circuits disposed behind to CPU I/O port, level conversion electricity
Road is mainly biased resistance by an audion and forms；Comprise the steps:
(1), the operating current of LNB power supply circuits flows through the voltage that sampling resistor produces, the break-make of control sampling audion；
(2), when LNB power supply circuits normally work, sampling triode operation is in cut-off region；
(3), when LNB power supply circuits exception, sampling audion enters saturation region, and sampling audion produces interrupt signal；
(4), interrupt signal exported the interrupt pin of CPU of satellite TV set-top boxes by level shifting circuit, trigger
Interrupt service routine；
(5), entering after interrupt service routine, CPU first passes through I/O port and closes LNB power supply circuits；
(6), in the UI interface display fault cues information of satellite TV set-top boxes, prompting user's LNB power supply circuits are abnormal.
When LNB power supply circuits normally work, operating current is less than 100mA, the voltage ＜ 0.7V that now sampling resistor produces,
Sampling triode operation is in cut-off region；When LNB power supply circuits occur abnormal, when operating current increases suddenly, on sampling resistor
Producing the voltage of ＞ 0.7V, sampling audion enters saturation region, and the colelctor electrode of sampling audion forms a rising edge voltage；This
Rising edge voltage exports the interrupt pin of the CPU of satellite TV set-top boxes as interrupt signal by level shifting circuit.
Interrupt service routine was opened LNB power supply circuits and exits interrupt service routine every 5 seconds；If LNB powers
Circuit abnormality Failure elimination, then remove the fault cues information in the UI interface of satellite TV set-top boxes, satellite TV set-top boxes
The most normally work；If LNB power supply circuits abnormal failure still suffers from, then sample circuit can send interrupt signal again to satellite electricity
Depending on the interrupt pin of the CPU of Set Top Box, satellite TV set-top boxes system is again introduced into interrupt service routine.
Above-mentioned detailed description of the invention is only the concrete case of the present invention, and the scope of patent protection of the present invention includes but not limited to
Above-mentioned detailed description of the invention, the detection protection side of LNB power supply circuits in any a kind of satellite TV set-top boxes meeting the present invention
Claims of method and any person of an ordinary skill in the technical field is suitably changed what it did or replaces, and all should
Fall into the scope of patent protection of the present invention.
As in figure 2 it is shown, the sampling resistor using sample circuit be resistance RS1, resistance RS2, resistance RS3 tri-electricity in parallel
Resistance, above three parallel resistive circuit is connected between base stage and the emitter stage of sampling audion QN2；Level shifting circuit includes
The colelctor electrode of audion QN4 and biasing resistor R4, sampling audion QN2 is connected to the base stage of audion QN4, audion QN4's
Colelctor electrode is connected to the interrupt pin of CPU；Biasing resistor R4 is connected to the prime outfan of LNB power supply circuits.
By detailed description of the invention above, described those skilled in the art can readily realize the present invention.But should
Working as understanding, the present invention is not limited to above-mentioned 3 kind detailed description of the invention.On the basis of disclosed embodiment, described technology
The technical staff in field can the different technical characteristic of combination in any, thus realize different technical schemes.
Claims (3)
1. the detection guard method of LNB power supply circuits in a satellite TV set-top boxes, it is characterised in that use sample circuit pair
LNB power supply circuits carried out stream, short-circuit detecting, and the interrupt signal that sample circuit produces were exported by level shifting circuit
The interrupt pin of the CPU of satellite TV set-top boxes, triggers interrupt service routine；Sample circuit is mainly added sampling by sampling audion
Resistance forms, the level shifting circuit of sampling audion LNB power supply circuits disposed behind to CPU I/O port, level conversion electricity
Road is mainly biased resistance by an audion and forms；Comprise the steps:
(1), the operating current of LNB power supply circuits flows through the voltage that sampling resistor produces, the break-make of control sampling audion；
(2), when LNB power supply circuits normally work, sampling triode operation is in cut-off region；
(3), when LNB power supply circuits exception, sampling audion enters saturation region, and sampling audion produces interrupt signal；
(4), interrupt signal exported the interrupt pin of CPU of satellite TV set-top boxes by level shifting circuit, trigger and interrupt
Service routine；
(5), entering after interrupt service routine, CPU first passes through I/O port and closes LNB power supply circuits；
(6), in the UI interface display fault cues information of satellite TV set-top boxes, prompting user's LNB power supply circuits are abnormal；
The sampling resistor using sample circuit is resistance RS1, resistance RS2, tri-parallel resistances of resistance RS3, and above three is in parallel
Resistance circuit is connected between base stage and the emitter stage of sampling audion QN2；Level shifting circuit includes audion QN4 and biasing
The colelctor electrode of resistance R4, sampling audion QN2 is connected to the base stage of audion QN4, and the colelctor electrode of audion QN4 is connected to CPU
Interrupt pin；Biasing resistor R4 is connected to the prime outfan of LNB power supply circuits.
The detection guard method of LNB power supply circuits, its feature in a kind of satellite TV set-top boxes the most according to claim 1
Being when LNB power supply circuits normally work, operating current is less than 100mA, the voltage ＜ 0.7V that now sampling resistor produces, sampling
Triode operation is in cut-off region；When LNB power supply circuits occur abnormal, when operating current increases suddenly, sampling resistor produces
The voltage of ＞ 0.7V, sampling audion enters saturation region, and the colelctor electrode of sampling audion forms a rising edge voltage；This rises
Exported the interrupt pin of the CPU of satellite TV set-top boxes by level shifting circuit as interrupt signal along voltage.
The detection guard method of LNB power supply circuits, its feature in a kind of satellite TV set-top boxes the most according to claim 1
It is that interrupt service routine was opened LNB power supply circuits and exits interrupt service routine every 5 seconds；If LNB power supply circuits
Abnormal failure eliminates, then remove the fault cues information in the UI interface of satellite TV set-top boxes, and satellite TV set-top boxes is again
Normal work；If LNB power supply circuits abnormal failure still suffers from, then sample circuit can send interrupt signal again to satellite TV set
The interrupt pin of the CPU of top box, satellite TV set-top boxes system is again introduced into interrupt service routine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410324795.1A CN104113779B (en) | 2014-07-09 | 2014-07-09 | Detection protection method for LNB power supply circuit in satellite television set top box |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410324795.1A CN104113779B (en) | 2014-07-09 | 2014-07-09 | Detection protection method for LNB power supply circuit in satellite television set top box |
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| CN104113779A CN104113779A (en) | 2014-10-22 |
| CN104113779B true CN104113779B (en) | 2017-01-11 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN101741055A (en) * | 2009-12-31 | 2010-06-16 | 成都东银信息技术股份有限公司 | Method for protecting satellite television LNB from short circuit |
| CN201690515U (en) * | 2010-04-27 | 2010-12-29 | 广东浩兆信息技术发展有限公司 | Antenna current foldback circuit of ground digital television set-up box |
| CN201986058U (en) * | 2011-01-10 | 2011-09-21 | 青岛海信电器股份有限公司 | LNB power supply circuit and television |
| 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 |
| CN203398768U (en) * | 2013-08-27 | 2014-01-15 | 崧顺电子（深圳）有限公司 | Low-cost AC input overvoltage protection circuit and switching power supply |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9419433B2 (en) * | 2012-10-09 | 2016-08-16 | Fsp Technology Inc. | Power supply apparatus relating to DC-DC voltage conversion and having short protection function |
-
2014
- 2014-07-09 CN CN201410324795.1A patent/CN104113779B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN101741055A (en) * | 2009-12-31 | 2010-06-16 | 成都东银信息技术股份有限公司 | Method for protecting satellite television LNB from short circuit |
| CN201690515U (en) * | 2010-04-27 | 2010-12-29 | 广东浩兆信息技术发展有限公司 | Antenna current foldback circuit of ground digital television set-up box |
| CN201986058U (en) * | 2011-01-10 | 2011-09-21 | 青岛海信电器股份有限公司 | LNB power supply circuit and television |
| 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 |
| CN203398768U (en) * | 2013-08-27 | 2014-01-15 | 崧顺电子（深圳）有限公司 | Low-cost AC input overvoltage protection circuit and switching power supply |
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| CN104113779A (en) | 2014-10-22 |
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Address after: 250100 West District, North First Floor, S06 Building, 1036 Langchao Road, Jinan High-tech Zone, Shandong Province Patentee after: Shandong Inspur Ultra HD Video Industry Co.,Ltd. Address before: 250100 West District, North First Floor, S06 Building, 1036 Langchao Road, Jinan High-tech Zone, Shandong Province Patentee before: SHANDONG YUNMAN INTELLIGENT TECHNOLOGY Co.,Ltd. |
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