CN102263916A - LNB (Low Noise Block) power supply control circuit, power supply control system and digital set-top box - Google Patents
LNB (Low Noise Block) power supply control circuit, power supply control system and digital set-top box Download PDFInfo
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Abstract
The invention is suitable for the field of a digital set-top box, and provides an LNB (Low Noise Block) power supply control circuit, a power supply control system and a digital set-top box. The control circuit comprises a power switch module, a power conversion module and a current detection short circuit module, wherein the power switch module is used for switching off after receiving a first short circuit signal output by the current detection short circuit module, switching on while receiving no first short circuit signal, and outputting a first power; the power conversion module is used for converting the first power into a second power of which the voltage is lower than a first power voltage; the current detection short circuit module is used for detecting output current of the second power, outputting the first short circuit signal when the load is short-circuited, and outputting LNB power supply voltage when the load works regularly. The control circuit cuts off power for hardware via the current detection short circuit module when short circuit happens, so that short circuit can be accurately detected, chip control is unnecessary and power consumption is further reduced; and the control circuit is simple in structure and low in cost.
Description
Technical field
The invention belongs to the top box of digital machine field, relate in particular to a kind of LNB power-supplying circuit, electric power supply control system and top box of digital machine.
Background technology
In the digital satellite television receiving system, need utilize the signal wire transmits electric current to realize to various external equipments such as low noise block downconverter (Low Noise Block, LNB), digital satellite device controller (Digital Satellite Equipment, the functions such as reception, amplification or motor-driven of corresponding signal are finished in power supply such as DiSEqC).Because LNB equipment is long-term work active electronic component in the open, very easily is subjected to Effect of Environmental such as rainwater corrosion, thunderbolt, surge (voltage and current) impact, can impact digital satellite set top box.Therefore in the design of digital satellite set-top box, when considering that function of supplying power is realized, also to think about the short-circuit protection measure.
Fig. 1 shows the structure of present more common LNB power-supplying circuit, wherein the input of power transfer module 11 is connected with power module in the top box of digital machine, be used to receive supply voltage, the output of power transfer module 11 is connected with the input of power switching module 12, the output of power switching module 12 is to LNB and DiSEqC output supply power voltage, the output of power switching module 12 is connected with the input of voltage detecting short block 13 simultaneously, the output of voltage detecting short block 13 is connected with the input of control module 14, and the output of control module 14 is connected with the control end of power switching module 12.
Fig. 2 shows the examples of circuits figure of above-mentioned LNB power-supplying circuit, wherein power transfer module 11 comprises: power conversion chip 111, resistance 101, resistance 102 and electric capacity 101, the input pin P1 of this power conversion chip 111 is the input of power transfer module 11, the output pin P2 of power conversion chip 111 is that the output of power transfer module 11 passes through resistance R 101 successively, resistance R 102 ground connection, resistance R 101 is connected with resistance R 102, the common port while of R101 and resistance R 102 and the grounding pin P3 of power conversion chip 111, one end of capacitor C 101 connects, the other end ground connection of capacitor C 101.
Voltage detecting short block 13 comprises: triode Q13, resistance R 106, resistance R 107 and resistance R 108, one end of resistance R 106 is the input of voltage detecting short block 13, the other end of resistance R 106 is by resistance R 107 ground connection, resistance R 106 is connected with the base stage of triode Q13 with the common port of resistance R 107, the grounded emitter of triode Q13, the collector electrode of triode Q13 connects the 3V supply voltage by resistance R 108, and the link of the collector electrode of triode Q13 and resistance R 108 is the output of voltage detecting short block 13.
When operate as normal, the supply power voltage of the output output of power switching module 12 is a high level, triode Q103 conducting in the voltage detecting short block 13, output low level feed back signal to control module 14, the switch controlling signal of control module 14 output high level makes power switching module 12 conductings, and power transfer module 11 is LNB and DiSEqC power supply with the output voltage that input voltage is converted to certain amplitude.
When load short circuits; output voltage reduces; triode Q103 turn-offs; the output high level feed back signal to control module 14; the switch controlling signal of control module 14 output low levels; triode Q102 in the power switching module 12, triode Q101 turn-off, and stop the power supply output to LNB and DiSEqC, realize the protection to short-circuit state.
But, this LNB power-supplying circuit is checked short-circuit condition and is used software switching-off by software, exist and to check once in a while less than problem of short-circuit, and set-top box can occur restart repeatedly and do not have the short circuit prompting when checking less than short circuit, there is very big electric energy loss in power conversion chip when turn-offing.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of LNB power-supplying circuit, and be intended to solve the software switching-off mode and detect once in a while less than problem of short-circuit, and power conversion chip big problem of power consumption when turn-offing.
The embodiment of the invention is achieved in that a kind of LNB power-supplying circuit, and described control circuit comprises:
Power switching module, power transfer module and current detecting short block;
The control end of described power switching module is connected with first output of described current detecting short block, the input of described power switching module is connected with first power supply, the output of described power switching module is connected with the input of described power transfer module, the output of described power transfer module is connected with the input of current detecting short block, and second output of current detecting short block is a LNB power supply output;
Described power switching module is used for turn-offing when receiving first short-circuit signal of described current detecting short block output, conducting when not receiving first short-circuit signal, and export first power supply;
It is the second source that is lower than described first supply voltage that described power transfer module is used for described first power source conversion;
Described current detecting short block is used for the output current of described second source is detected, and exports first short-circuit signal in first output when load short circuits, exports the LNB supply power voltage in second output when the load operate as normal.
Another purpose of the embodiment of the invention is to provide a kind of LNB electric power supply control system that adopts above-mentioned control circuit.
Another purpose of the embodiment of the invention is to provide a kind of top box of digital machine that adopts above-mentioned electric power supply control system.
In embodiments of the present invention, utilize the current detecting short block to realize that when short circuit hardware turn-offs, realize the accurate detection of short circuit, need not chip controls, further reduced power consumption, the simple cost of this circuit structure is low.
Description of drawings
Fig. 1 is the structured flowchart of the LNB power-supplying circuit of prior art;
Fig. 2 is the examples of circuits figure of the LNB power-supplying circuit of prior art;
The structure chart of the LNB power-supplying circuit that Fig. 3 provides for first embodiment of the invention;
The examples of circuits structure chart of the LNB power-supplying circuit that Fig. 4 provides for second embodiment of the invention;
The preferred circuit example structure figure of the LNB power-supplying circuit that Fig. 5 provides for third embodiment of the invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
The embodiment of the invention realizes software protection and hardware protection respectively by voltage detecting short block and current detecting short block, realizes LNB power-supplying circuit high reliability, the low energy consumption operation.
Fig. 3 illustrates the structure of the LNB power-supplying circuit that first embodiment of the invention provides, and for convenience of explanation, only shows part related to the present invention.
This LNB power-supplying circuit can be applicable in the LNB electric power supply control system of various series, and this LNB electric power supply control system can be applicable to again in the top box of digital machine of various series.
The LNB power-supplying circuit that provides as one embodiment of the invention comprises:
The control end of power switching module 34 is connected with first output of current detecting short block 31, the input V of power switching module 34
InBe connected with first power supply of 24V, the output of power switching module 34 is connected with the input of power transfer module 36, the output of power transfer module 36 is connected with the input of current detecting short block, and second output of current detecting short block is LNB power supply output V
Out
It is the second source that is lower than first supply voltage that power transfer module 36 is used for first power source conversion;
Current detecting short block 31 is used for the output current of second source is detected, and exports first short-circuit signal in first output when load short circuits, exports the LNB supply power voltage in second output when the load operate as normal.
In embodiments of the present invention, utilize the current detecting short block to realize that when short circuit hardware turn-offs, realize the accurate detection of short circuit, need not chip controls, further reduced power consumption, the simple cost of this circuit structure is low.
Below in conjunction with specific embodiment realization of the present invention is elaborated.
Fig. 4 shows the examples of circuits structure of the LNB power-supplying circuit that second embodiment of the invention provides, and for convenience of explanation, only shows part related to the present invention.
In embodiments of the present invention, power switching module 34 comprises: triode Q33, triode Q34, triode Q35, resistance R 307, resistance R 308, resistance R 309, resistance R 310 and resistance R 311;
One end of resistance R 310 is the control end of power switching module 34, the other end of resistance R 310 is connected with the base stage of triode Q35, the grounded emitter of triode Q35, the collector electrode of triode Q35 is connected with the 3rd power supply of 3.3V by resistance R 309, the collector electrode of triode Q35 is connected with the base stage of triode Q34 by resistance R 311 simultaneously, the grounded emitter of triode Q34, the collector electrode of triode Q34 is connected with an end of resistance R 307, the other end of resistance R 307 is connected with the base stage of triode Q33 and an end of resistance R 308 simultaneously, the other end of resistance R 308 is that the input of power switching module 34 is connected with the emitter of triode Q33, and the current collection of triode Q33 is the output of power switching module 34 very.
The input pin of power conversion chip 361 is the input of power transfer module 36, the output pin of power conversion chip 361 is the output of power transfer module 36, the output pin of power conversion chip 361 is resistance R 306, resistance R 305 ground connection by connecting successively, the common port that resistance R 306 is connected with resistance R 305 is connected with the control pin of power conversion chip 361, and the control pin of power conversion chip 361 is again by capacitor C 301 ground connection.
Current detecting short block 31 comprises: triode Q31, resistance R 301, resistance R 302, resistance R 303, diode D301;
The emission of the triode Q31 very input of current detecting short block 31 is connected with the anode of diode D301 by resistance R 301, the collector electrode of triode Q31 is connected with an end of resistance R 303, the other end of resistance R 303 is first output of current detecting short block 31, the base stage of triode Q31 is connected with the anode of diode D301 by resistance R 302, and the negative electrode of diode D301 is second output of current detecting short block 31.
As one embodiment of the invention, triode Q31 and triode Q33 can adopt the positive-negative-positive triode, and triode Q34 and triode Q35 can adopt NPN type triode.
In embodiments of the present invention, when the load operate as normal, the output current deficiency of second source is so that triode Q31 conducting, current detecting short block 31 outputs are low level, therefore triode Q35 ends, an end that causes resistance R 311 is a high level, triode Q34 conducting, resistance R 308 has the electric current process, making has pressure reduction between the base stage of triode Q33 and the emitter, so triode Q33 conducting, and first power supply is exported to power transfer module 36, power transfer module 36 is the second source of required amplitude with first power source conversion of 24V, and is output as LNB by current detecting short block 31 supply power voltage is provided.
When load short circuits; it is big that the output current of second source becomes; surface current increases on the resistance R 301; emitter and the voltage between the base stage of triode Q31 also can increase; when electric current is increased to a certain degree; the voltage at the emitter of triode Q31 and base stage two ends reaches and makes triode Q31 conducting; make resistance R 303 upper ends produce high level; promptly be equivalent to export first short-circuit signal of high level, this moment triode Q32 and triode Q35 conducting, the voltage of resistance R 311 1 ends is reduced to low level; triode Q34 turn-offs; triode Q33 also can't conducting, stops the power supply to LNB, to finish the hardware short-circuit protection.
Fig. 5 shows the preferred circuit example structure of the LNB power-supplying circuit that third embodiment of the invention provides, and for convenience of explanation, only shows part related to the present invention.
In embodiments of the present invention, power transfer module 36 also comprises triode Q32, its grounded emitter, its collector electrode is connected with the control pin of power conversion chip 361, its base stage is connected with first output of current detecting short block 31, be used for when power switching module 34 lost efficacy, receiving first short-circuit signal, and when receiving first short-circuit signal, make control power transfer module 36 stop conversion output.
Current detecting short block 31 also comprises diode D303, this diode D303 is series between second output of diode D303 and current detecting short block 31, the anode of diode D303 is connected with the negative electrode of diode D301, be used for when long-time short-circuit condition, reduce the power consumption of power transfer module 36, and when operate as normal, export the LNB supply power voltage.
As the present invention one embodiment preferably, this LNB power-supplying circuit can also comprise:
Voltage detecting short block 32, the input of voltage detecting short block 32 is connected with LNB power supply output, is used for the LNB supply power voltage is detected, and exports second short-circuit signal when load short circuits;
Control chip 33, the input pin of control chip 33 is connected with the output of voltage detecting short block 32, the output pin of control chip 33 is connected with the control end of power transfer module 32, be used for producing an enable signal, control the break-make of described power switching module according to described second short-circuit signal.
In embodiments of the present invention, voltage detecting short block 32 comprises: triode Q36, resistance R 312, resistance R 313 and resistance R 314;
The current collection of the triode Q36 very output of voltage detecting short block 32 is connected with the 3rd power supply by resistance R 314, the grounded emitter of triode Q36, the base stage of triode Q36 is connected with an end of resistance R 312, the other end of resistance R 312 is the input of voltage detecting short block 32, and the base stage of triode Q36 is simultaneously by resistance R 313 ground connection.
In embodiments of the present invention, when current detecting short block 31 lost efficacy, can carry out short-circuit detecting by voltage detecting short block 32 and control chip 33.
When load short circuits; output voltage diminishes; dividing potential drop by resistance R 312 and resistance R 313; the base voltage of triode Q36 is lower than conducting voltage, and triode Q36 turn-offs, second short-circuit signal of the collector terminal output high level of triode Q36; further give power switching module 34 by the enable signal of software control chip 33 output high level; power switching module 34 turn-offs, and stops to LNB output power supply, to finish the software short-circuit protection.
When load is in long-time short circuit; diode D303 makes that the output pin voltage of power conversion chip 361 increases to 1.2V from original 0.6V when short circuit; thereby power conversion chip 361 is under the protected mode; and then to set-top box internal circuit and power supply realization protection; and do not have power consumption to produce, realize the complete machine low-power consumption when realizing protection power conversion chip 361.
Starting shooting moment, the enable signal of control chip 33 outputs is a high level, causes power switching module 34 to turn-off; realize the output of start no-voltage; avoid the short circuit of when output start, and the also not work of each short-circuit protection module, can't provide short-circuit protection and the circuit that causes damages.
In embodiments of the present invention, when whole LNB power-supplying circuit in when output power supply not, can provide the enable signal control power switching module 34 of high level to turn-off by control chip 33, realize low power dissipation design.
In embodiments of the present invention; finishing hardware by the current detecting short block turn-offs; realize the accurate detection of short circuit; need not chip; reduced the power consumption of circuit; the present invention is also by increasing the voltage detecting short block as the software auxiliary protection; and in start moment employing power-on protection module realization power-on protection; improving the LNB power-supplying circuit greatly under complicated environment for use in the reliability to short-circuit protection; reduce the fraction defective of whole set equipment; saved energy consumption simultaneously, this control circuit is simple in structure, realizes easily.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a LNB power-supplying circuit is characterized in that, described control circuit comprises:
Power switching module, power transfer module and current detecting short block;
The control end of described power switching module is connected with first output of described current detecting short block, the input of described power switching module is connected with first power supply, the output of described power switching module is connected with the input of described power transfer module, the output of described power transfer module is connected with the input of current detecting short block, and second output of current detecting short block is a LNB power supply output;
Described power switching module is used for turn-offing when receiving first short-circuit signal of described current detecting short block output, conducting when not receiving first short-circuit signal, and export first power supply;
It is the second source that is lower than described first supply voltage that described power transfer module is used for described first power source conversion;
Described current detecting short block is used for the output current of described second source is detected, and exports first short-circuit signal in first output when load short circuits, exports the LNB supply power voltage in second output when the load operate as normal.
2. control circuit as claimed in claim 1 is characterized in that, described power switching module comprises:
Triode Q33, triode Q34, triode Q35, resistance R 307, resistance R 308, resistance R 309, resistance R 310 and resistance R 311;
One end of described resistance R 310 is the control end of described power switching module, the other end of described resistance R 310 is connected with the base stage of described triode Q35, the grounded emitter of described triode Q35, the collector electrode of described triode Q35 is connected with the 3rd power supply by described resistance R 309, the collector electrode of described triode Q35 is connected with the base stage of described triode Q34 by described resistance R 311 simultaneously, the grounded emitter of described triode Q34, the collector electrode of described triode Q34 is connected with an end of described resistance R 307, the other end of described resistance R 307 is connected with the base stage of described triode Q33 and an end of described resistance R 308 simultaneously, the other end of described resistance R 308 is that the input of described power switching module is connected the output of the very described power switching module of the current collection of described triode Q33 with the emitter of described triode Q33.
3. control circuit as claimed in claim 1 is characterized in that, described power transfer module comprises:
Power conversion chip, capacitor C 301, resistance R 305 and resistance R 306;
The input pin of described power conversion chip is the input of described power transfer module, the output pin of described power conversion chip is the output of described power transfer module, the output pin of described power conversion chip is described resistance R 306, described resistance R 305 ground connection by connecting successively, the common port that described resistance R 306 is connected with described resistance R 305 is connected with the control pin of described power conversion chip, and the control pin of described power conversion chip is again by described capacitor C 301 ground connection.
4. control circuit as claimed in claim 3, it is characterized in that described power transfer module also comprises triode Q32, its grounded emitter, its collector electrode is connected with the control pin of described power conversion chip, and its base stage is connected with first output of described current detecting short block.
5. control circuit as claimed in claim 1 is characterized in that, described current detecting short block comprises:
Triode Q31, resistance R 301, resistance R 302, resistance R 303, diode D301;
The input of the very described current detecting short block of the emission of described triode Q31 is connected with the anode of described diode D301 by described resistance R 301, the collector electrode of described triode Q31 is connected with an end of described resistance R 303, the other end of described resistance R 303 is first output of described current detecting short block, the base stage of described triode Q31 is connected with the anode of described diode D301 by described resistance R 302, and the negative electrode of described diode D301 is second output of described current detecting short block.
6. control circuit as claimed in claim 5 is characterized in that, described current detecting short block also comprises:
Diode D303, described diode D303 are series between second output of described diode D303 and described current detecting short block, and the anode of described diode D303 is connected with the negative electrode of described diode D301.
7. control circuit as claimed in claim 1 is characterized in that, described control circuit also comprises:
Voltage detecting short block and control chip;
The input of described voltage detecting short block is connected with described LNB power supply output, the output of described voltage detecting short block is connected with the input pin of described control chip, be used for the LNB supply power voltage is detected, when load short circuits, export second short-circuit signal;
The output pin of described control chip is connected with the control end of described power switching module, is used for producing an enable signal according to described second short-circuit signal, controls the break-make of described power switching module.
8. control circuit as claimed in claim 7 is characterized in that, described voltage detecting short block comprises:
Triode Q36, resistance R 312, resistance R 313 and resistance R 314;
The output of the very described voltage detecting short block of the current collection of described triode Q36 is connected with the 3rd power supply by described resistance R 314, the grounded emitter of described triode Q36, the base stage of described triode Q36 is connected with an end of described resistance R 312, the other end of described resistance R 312 is the input of described voltage detecting short block, and the base stage of described triode Q36 is simultaneously by described resistance R 313 ground connection.
9. a LNB electric power supply control system is characterized in that, the power-supplying circuit of described electric power supply control system is as claim 1 to 8 control circuit as described in each.
10. a top box of digital machine is characterized in that, the electric power supply control system of described top box of digital machine is an electric power supply control system as claimed in claim 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110150672 CN102263916B (en) | 2011-06-07 | 2011-06-07 | LNB (Low Noise Block) power supply control circuit, power supply control system and digital set-top box |
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| CN 201110150672 CN102263916B (en) | 2011-06-07 | 2011-06-07 | LNB (Low Noise Block) power supply control circuit, power supply control system and digital set-top box |
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| CN102263916B CN102263916B (en) | 2013-04-17 |
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| CN102710915A (en) * | 2012-05-29 | 2012-10-03 | 深圳市九洲电器有限公司 | LNB (Low Noise Block) power supply control circuit |
| CN102723693A (en) * | 2012-05-31 | 2012-10-10 | 南京德朔实业有限公司 | Load protection circuit and method for electric tool |
| CN103227943A (en) * | 2013-04-15 | 2013-07-31 | 深圳创维数字技术股份有限公司 | Protection method, equipment and system of set top box |
| CN107197184A (en) * | 2017-07-05 | 2017-09-22 | 青岛海信电器股份有限公司 | A kind of supplying power for tuner control circuit, system and top box of digital machine |
| CN108173422A (en) * | 2018-01-24 | 2018-06-15 | 深圳市朗仁科技有限公司 | The anti-point sparking reset circuit of vehicular data acquisition box |
| CN109547778A (en) * | 2018-12-27 | 2019-03-29 | 湖南国科微电子股份有限公司 | Set-top box testing device |
| CN110502092A (en) * | 2019-07-17 | 2019-11-26 | 闻泰科技(无锡)有限公司 | Power supply circuit and electronic equipment |
| WO2020057493A1 (en) * | 2018-09-19 | 2020-03-26 | 青岛海信电器股份有限公司 | Overcurrent protection method and television receiver |
| CN111934275A (en) * | 2019-05-13 | 2020-11-13 | 澜至电子科技（成都）有限公司 | Overcurrent protection circuit, control circuit, chip and control method |
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| CN102710915B (en) * | 2012-05-29 | 2015-01-28 | 深圳市九洲电器有限公司 | LNB (Low Noise Block) power supply control circuit |
| CN102710915A (en) * | 2012-05-29 | 2012-10-03 | 深圳市九洲电器有限公司 | LNB (Low Noise Block) power supply control circuit |
| CN102723693A (en) * | 2012-05-31 | 2012-10-10 | 南京德朔实业有限公司 | Load protection circuit and method for electric tool |
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| CN107197184A (en) * | 2017-07-05 | 2017-09-22 | 青岛海信电器股份有限公司 | A kind of supplying power for tuner control circuit, system and top box of digital machine |
| CN108173422A (en) * | 2018-01-24 | 2018-06-15 | 深圳市朗仁科技有限公司 | The anti-point sparking reset circuit of vehicular data acquisition box |
| CN108173422B (en) * | 2018-01-24 | 2024-04-12 | 深圳市云伽智能技术有限公司 | Ignition-prevention reset circuit of automobile data acquisition box |
| WO2020057493A1 (en) * | 2018-09-19 | 2020-03-26 | 青岛海信电器股份有限公司 | Overcurrent protection method and television receiver |
| CN109547778A (en) * | 2018-12-27 | 2019-03-29 | 湖南国科微电子股份有限公司 | Set-top box testing device |
| CN109547778B (en) * | 2018-12-27 | 2021-03-12 | 湖南国科微电子股份有限公司 | Set-top box testing device |
| CN111934275A (en) * | 2019-05-13 | 2020-11-13 | 澜至电子科技（成都）有限公司 | Overcurrent protection circuit, control circuit, chip and control method |
| CN111934275B (en) * | 2019-05-13 | 2022-11-11 | 澜至电子科技（成都）有限公司 | Overcurrent protection circuit, control circuit, chip and control method |
| CN110502092B (en) * | 2019-07-17 | 2023-11-24 | 闻泰科技(无锡)有限公司 | Power supply circuit and electronic equipment |
| CN110502092A (en) * | 2019-07-17 | 2019-11-26 | 闻泰科技(无锡)有限公司 | Power supply circuit and electronic equipment |
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| Publication number | Publication date |
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| CN102263916B (en) | 2013-04-17 |
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