CN104113779A - 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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- CN104113779A CN104113779A CN201410324795.1A CN201410324795A CN104113779A CN 104113779 A CN104113779 A CN 104113779A CN 201410324795 A CN201410324795 A CN 201410324795A CN 104113779 A CN104113779 A CN 104113779A
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000001514 detection method Methods 0.000 title claims abstract description 17
- 238000005070 sampling Methods 0.000 claims abstract description 75
- 230000002159 abnormal effect Effects 0.000 claims description 18
- 230000000630 rising effect Effects 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000002452 interceptive effect 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, an LNB power supply circuit is arranged behind the sampling triode and is connected with a level conversion circuit of the CPUIO port, and the level conversion circuit mainly comprises a triode and a biasing resistor.
Description
Technical field
The present invention relates to a kind of LNB power supply protection of satellite television Set Top Box, the specifically detection guard method of LNB power supply circuits in a kind of satellite television Set Top Box.
Background technology
Satellite television Set Top Box is a kind of receiving satellite word TV signal change into the equipment of high-quality audio-video signal output of being used for, that one can allow user on existing simulated television, watch installation satellite television programming, carry out the consumption industry electronic product of interactive digital amusement, education and commercialization activity.
LNB(low noise block downconverter) be exactly low news frequency reducing amplifier, its function is through amplifying and frequency conversion by the satellite-signal being transmitted by feed, Ku or C-band signal are become to L(950MHz-2150MHz) wave band, send satellite television Set Top Box to through coaxial cable.
In recent years, domestic digital satellite television receiver price is very fierce, and each producer, in order to dominate the market, reduces product cost by all means, for consumer provides practical product at a low price.In the process of reduced cost, there are many companies that sight has been put on LNB power supply circuits, adopt lower-cost LNB power supply plan.But LNB power supply circuits generally do not comprise short circuit, overcurrent protection function cheaply.In user's use procedure, if increased for electrical short or electric current moment because external cause causes LNB, can cause occurring instantaneous large-current, cause satellite set top box power unit device to burn, short circuit or overcurrent, even can cause satellite set top box power pack device overheated for a long time, causes danger.
Summary of the invention
Technical assignment of the present invention is for above weak point; provide a kind of to LNB power supply circuits overcurrent or short-circuit condition detects and interrupt voltage protection in time, prevent the detection guard method of LNB power supply circuits in a kind of satellite television Set Top Box that the LNB power supply circuits of satellite television Set Top Box are burnt because of short circuit or the increase of electric current moment.
The technical solution adopted for the present invention to solve the technical problems is: adopt sample circuit to carry out overcurrent, short-circuit detecting to LNB power supply circuits, and the interrupt signal that sample circuit is produced outputs to the interrupt pin of the CPU of satellite television Set Top Box, triggering interrupt service routine by level shifting circuit; Sample circuit is mainly added sampling resistor and is formed by sampling triode, the level shifting circuit of LNB power supply circuits to CPU IO mouth is set after sampling triode, and level shifting circuit is mainly biased resistance by a triode 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 triode;
(2), in the time that LNB power supply circuits are normally worked, sampling triode be operated in cut-off region;
(3), in the time that LNB power supply circuits are abnormal, sampling triode enter saturation region, sampling triode produce interrupt signal;
(4), interrupt signal outputs to the interrupt pin of the CPU of satellite television Set Top Box by level shifting circuit, trigger interrupt service routine;
(5), enter interrupt service routine after, first CPU closes LNB power supply circuits by IO mouth;
(6), in the UI of satellite television Set Top Box interface display fault information, prompting user LNB power supply circuits are abnormal, ask user to investigate fault.
When LNB power supply circuits are normally worked, operating current is less than 100mA, the voltage < 0.7V that now sampling resistor produces, and sampling triode is operated in cut-off region; When LNB power supply circuits occur extremely, when operating current increases suddenly, producing the voltage of > 0.7V on sampling resistor, sampling triode enters saturation region, and the collector electrode of sampling triode forms a rising edge voltage; This rising edge voltage outputs to the interrupt pin of the CPU of satellite television Set Top Box by level shifting circuit as interrupt signal.
Interrupt service routine was opened LNB power supply circuits and exits interrupt service routine every 5 seconds; If LNB power supply circuits abnormal failure is eliminated, remove the fault information in the UI interface of satellite television Set Top Box, satellite television Set Top Box is normally worked again; If LNB power supply circuits abnormal failure still exists, sample circuit can send the interrupt pin of interrupt signal to the CPU of satellite television Set Top Box again, and satellite television set-top-box system enters interrupt service routine again.
Adopting the sampling resistor of sample circuit is resistance R S1, resistance R S2, tri-parallel resistances of resistance R S3, and above-mentioned three parallel resistance circuit are connected between the base stage and emitter of sampling triode QN2; Level shifting circuit comprises triode QN4 and biasing resistor R4, and the collector electrode of sampling triode QN2 is connected to the base stage of triode QN4, and the collector electrode of triode QN4 is connected to the interrupt pin of CPU; Biasing resistor R4 is connected to the prime output of LNB power supply circuits.
In a kind of satellite television Set Top Box of the present invention, compared to the prior art the detection guard method of LNB power supply circuits, has the following advantages:
1, sample circuit carries out overcurrent, short-circuit detecting to LNB power supply circuits, and the interrupt signal that sample circuit is produced outputs to the interrupt pin of the CPU of satellite television Set Top Box by level shifting circuit, trigger interrupt service routine, effectively prevent that the LNB power supply circuits of satellite television Set Top Box from being burnt because 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 make the overcurrent that the interference of moment causes, the transient fault of short circuit, and after instantaneous eliminating, satellite television set-top-box system is restored in time;
3, simple in structure, the low cost of manufacture, practical of sample circuit and level shifting circuit.
Brief description of the drawings
Below in conjunction with accompanying drawing, the present invention is further described.
Accompanying drawing 1 is the flow chart of the detection guard method of LNB power supply circuits in a kind of satellite television Set Top Box;
Accompanying drawing 2 is the sample circuit of detection guard method and the circuit diagram of level shifting circuit of LNB power supply circuits in a kind of satellite television Set Top Box.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
Embodiment 1:
The detection guard method of LNB power supply circuits in a kind of satellite television Set Top Box of the present invention, adopt sample circuit to carry out overcurrent, short-circuit detecting to LNB power supply circuits, and the interrupt signal that sample circuit is produced outputs to the interrupt pin of the CPU of satellite television Set Top Box, triggering interrupt service routine by level shifting circuit; Sample circuit is mainly added sampling resistor and is formed by sampling triode, the level shifting circuit of LNB power supply circuits to CPU IO mouth is set after sampling triode, and level shifting circuit is mainly biased resistance by a triode 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 triode;
(2), in the time that LNB power supply circuits are normally worked, sampling triode be operated in cut-off region;
(3), in the time that LNB power supply circuits are abnormal, sampling triode enter saturation region, sampling triode produce interrupt signal;
(4), interrupt signal outputs to the interrupt pin of the CPU of satellite television Set Top Box by level shifting circuit, trigger interrupt service routine;
(5), enter interrupt service routine after, first CPU closes LNB power supply circuits by IO mouth;
(6), in the UI of satellite television Set Top Box interface display fault information, prompting user LNB power supply circuits are abnormal.
Embodiment 2:
The detection guard method of LNB power supply circuits in a kind of satellite television Set Top Box of the present invention, adopt sample circuit to carry out overcurrent, short-circuit detecting to LNB power supply circuits, and the interrupt signal that sample circuit is produced outputs to the interrupt pin of the CPU of satellite television Set Top Box, triggering interrupt service routine by level shifting circuit; Sample circuit is mainly added sampling resistor and is formed by sampling triode, the level shifting circuit of LNB power supply circuits to CPU IO mouth is set after sampling triode, and level shifting circuit is mainly biased resistance by a triode 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 triode;
(2), in the time that LNB power supply circuits are normally worked, sampling triode be operated in cut-off region;
(3), in the time that LNB power supply circuits are abnormal, sampling triode enter saturation region, sampling triode produce interrupt signal;
(4), interrupt signal outputs to the interrupt pin of the CPU of satellite television Set Top Box by level shifting circuit, trigger interrupt service routine;
(5), enter interrupt service routine after, first CPU closes LNB power supply circuits by IO mouth;
(6), in the UI of satellite television Set Top Box interface display fault information, prompting user LNB power supply circuits are abnormal.
When LNB power supply circuits are normally worked, operating current is less than 100mA, the voltage < 0.7V that now sampling resistor produces, and sampling triode is operated in cut-off region; When LNB power supply circuits occur extremely, when operating current increases suddenly, producing the voltage of > 0.7V on sampling resistor, sampling triode enters saturation region, and the collector electrode of sampling triode forms a rising edge voltage; This rising edge voltage outputs to the interrupt pin of the CPU of satellite television Set Top Box by level shifting circuit as interrupt signal.
Interrupt service routine was opened LNB power supply circuits and exits interrupt service routine every 5 seconds; If LNB power supply circuits abnormal failure is eliminated, remove the fault information in the UI interface of satellite television Set Top Box, satellite television Set Top Box is normally worked again; If LNB power supply circuits abnormal failure still exists, sample circuit can send the interrupt pin of interrupt signal to the CPU of satellite television Set Top Box again, and satellite television set-top-box system enters interrupt service routine again.
Embodiment 3:
The detection guard method of LNB power supply circuits in a kind of satellite television Set Top Box of the present invention, adopt sample circuit to carry out overcurrent, short-circuit detecting to LNB power supply circuits, and the interrupt signal that sample circuit is produced outputs to the interrupt pin of the CPU of satellite television Set Top Box, triggering interrupt service routine by level shifting circuit; Sample circuit is mainly added sampling resistor and is formed by sampling triode, the level shifting circuit of LNB power supply circuits to CPU IO mouth is set after sampling triode, and level shifting circuit is mainly biased resistance by a triode 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 triode;
(2), in the time that LNB power supply circuits are normally worked, sampling triode be operated in cut-off region;
(3), in the time that LNB power supply circuits are abnormal, sampling triode enter saturation region, sampling triode produce interrupt signal;
(4), interrupt signal outputs to the interrupt pin of the CPU of satellite television Set Top Box by level shifting circuit, trigger interrupt service routine;
(5), enter interrupt service routine after, first CPU closes LNB power supply circuits by IO mouth;
(6), in the UI of satellite television Set Top Box interface display fault information, prompting user LNB power supply circuits are abnormal.
When LNB power supply circuits are normally worked, operating current is less than 100mA, the voltage < 0.7V that now sampling resistor produces, and sampling triode is operated in cut-off region; When LNB power supply circuits occur extremely, when operating current increases suddenly, producing the voltage of > 0.7V on sampling resistor, sampling triode enters saturation region, and the collector electrode of sampling triode forms a rising edge voltage; This rising edge voltage outputs to the interrupt pin of the CPU of satellite television Set Top Box by level shifting circuit as interrupt signal.
Interrupt service routine was opened LNB power supply circuits and exits interrupt service routine every 5 seconds; If LNB power supply circuits abnormal failure is eliminated, remove the fault information in the UI interface of satellite television Set Top Box, satellite television Set Top Box is normally worked again; If LNB power supply circuits abnormal failure still exists, sample circuit can send the interrupt pin of interrupt signal to the CPU of satellite television Set Top Box again, and satellite television set-top-box system enters interrupt service routine again.
Above-mentioned embodiment is only concrete case of the present invention; scope of patent protection of the present invention includes but not limited to above-mentioned embodiment; in any a kind of satellite television Set Top Box according to the invention, suitable variation or the replacements claims and that any person of an ordinary skill in the technical field does it of the detection guard method of LNB power supply circuits, all should fall into scope of patent protection of the present invention.
As shown in Figure 2, adopting the sampling resistor of sample circuit is resistance R S1, resistance R S2, tri-parallel resistances of resistance R S3, and above-mentioned three parallel resistance circuit are connected between the base stage and emitter of sampling triode QN2; Level shifting circuit comprises triode QN4 and biasing resistor R4, and the collector electrode of sampling triode QN2 is connected to the base stage of triode QN4, and the collector electrode of triode QN4 is connected to the interrupt pin of CPU; Biasing resistor R4 is connected to the prime output of LNB power supply circuits.
By embodiment above, described those skilled in the art can be easy to realize the present invention.But should be appreciated that the present invention is not limited to 3 kinds of above-mentioned embodiments.On the basis of disclosed execution mode, described those skilled in the art can the different technical characterictic of combination in any, thereby realizes different technical schemes.
Claims (4)
1. the detection guard method of LNB power supply circuits in a satellite television Set Top Box, it is characterized in that adopting sample circuit to carry out overcurrent, short-circuit detecting to LNB power supply circuits, and the interrupt signal that sample circuit is produced outputs to the interrupt pin of the CPU of satellite television Set Top Box, triggering interrupt service routine by level shifting circuit; Sample circuit is mainly added sampling resistor and is formed by sampling triode, the level shifting circuit of LNB power supply circuits to CPU IO mouth is set after sampling triode, and level shifting circuit is mainly biased resistance by a triode 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 triode;
(2), in the time that LNB power supply circuits are normally worked, sampling triode be operated in cut-off region;
(3), in the time that LNB power supply circuits are abnormal, sampling triode enter saturation region, sampling triode produce interrupt signal;
(4), interrupt signal outputs to the interrupt pin of the CPU of satellite television Set Top Box by level shifting circuit, trigger interrupt service routine;
(5), enter interrupt service routine after, first CPU closes LNB power supply circuits by IO mouth;
(6), in the UI of satellite television Set Top Box interface display fault information, prompting user LNB power supply circuits are abnormal.
2. the detection guard method of LNB power supply circuits in a kind of satellite television Set Top Box according to claim 1, while it is characterized in that LNB power supply circuits are normally worked, operating current is less than 100mA, the voltage < 0.7V that now sampling resistor produces, sampling triode is operated in cut-off region; When LNB power supply circuits occur extremely, when operating current increases suddenly, producing the voltage of > 0.7V on sampling resistor, sampling triode enters saturation region, and the collector electrode of sampling triode forms a rising edge voltage; This rising edge voltage outputs to the interrupt pin of the CPU of satellite television Set Top Box by level shifting circuit as interrupt signal.
3. the detection guard method of LNB power supply circuits in a kind of satellite television Set Top Box according to claim 1, is characterized in that interrupt service routine opens LNB power supply circuits and exit interrupt service routine every 5 seconds; If LNB power supply circuits abnormal failure is eliminated, remove the fault information in the UI interface of satellite television Set Top Box, satellite television Set Top Box is normally worked again; If LNB power supply circuits abnormal failure still exists, sample circuit can send the interrupt pin of interrupt signal to the CPU of satellite television Set Top Box again, and satellite television set-top-box system enters interrupt service routine again.
4. the detection guard method of LNB power supply circuits in a kind of satellite television Set Top Box according to claim 1, it is characterized in that adopting the sampling resistor of sample circuit is resistance R S1, resistance R S2, tri-parallel resistances of resistance R S3, above-mentioned three parallel resistance circuit are connected between the base stage and emitter of sampling triode QN2; Level shifting circuit comprises triode QN4 and biasing resistor R4, and the collector electrode of sampling triode QN2 is connected to the base stage of triode QN4, and the collector electrode of triode QN4 is connected to the interrupt pin of CPU; Biasing resistor R4 is connected to the prime output of LNB power supply circuits.
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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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| 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 true CN104113779A (en) | 2014-10-22 |
| CN104113779B CN104113779B (en) | 2017-01-11 |
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Citations (7)
| 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 |
| US20140098452A1 (en) * | 2012-10-09 | 2014-04-10 | 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 (7)
| 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 |
| US20140098452A1 (en) * | 2012-10-09 | 2014-04-10 | Fsp Technology Inc. | Power supply apparatus relating to dc-dc voltage conversion and having short protection function |
| 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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| CN104113779B (en) | 2017-01-11 |
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Effective date of registration: 20190201 Address after: 250100 West District, North First Floor, S06 Building, 1036 Langchao Road, Jinan High-tech Zone, Shandong Province Patentee after: SHANDONG YUNMAN INTELLIGENT TECHNOLOGY Co.,Ltd. Address before: 250100 No. 2877 Kehang Road, Sun Village Town, Jinan High-tech District, Shandong Province Patentee before: INSPUR GROUP Co.,Ltd. |
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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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