CN107197184A - A kind of supplying power for tuner control circuit, system and top box of digital machine - Google Patents
A kind of supplying power for tuner control circuit, system and top box of digital machine Download PDFInfo
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- CN107197184A CN107197184A CN201710542233.8A CN201710542233A CN107197184A CN 107197184 A CN107197184 A CN 107197184A CN 201710542233 A CN201710542233 A CN 201710542233A CN 107197184 A CN107197184 A CN 107197184A
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- voltage
- tuner
- power
- output
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/63—Generation or supply of power specially adapted for television receivers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/442—Monitoring of processes or resources, e.g. detecting the failure of a recording device, monitoring the downstream bandwidth, the number of times a movie has been viewed, the storage space available from the internal hard disk
- H04N21/4424—Monitoring of the internal components or processes of the client device, e.g. CPU or memory load, processing speed, timer, counter or percentage of the hard disk space used
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/443—OS processes, e.g. booting an STB, implementing a Java virtual machine in an STB or power management in an STB
- H04N21/4436—Power management, e.g. shutting down unused components of the receiver
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- General Engineering & Computer Science (AREA)
- Software Systems (AREA)
- Computer Networks & Wireless Communication (AREA)
- Databases & Information Systems (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
The application provides a kind of supplying power for tuner control circuit, system and top box of digital machine, and the circuit includes：Voltage conversion unit, switch control unit and power switch unit, when output voltage is loaded work piece voltage, switch control unit exports the first control signal, in load short circuits voltage, exports the second control signal；Power switch unit is turned off when receiving the second control signal, is turned on when receiving the first control signal, and the supply voltage of output high frequency tuner.The application judges whether tuner occurs short circuit phenomenon by switch control unit to the detection for output end output voltage of powering, when short circuit occurs for tuner, switch control unit exports the second control signal, control ShiShimonoseki disconnected tuner power-supplying circuit of the power switch unit in the second control signal, so that the energization input of supplying power for tuner control circuit is not powered by it, output end voltage falls and influenceed, so as to ensure that the supply voltage of the power supply module of other in power management chip keeps stable state.
Description
Technical field
The application is related to supplying power for tuner field, more particularly to a kind of supplying power for tuner control circuit, system and teaching machine
Top box.
Background technology
As the nucleus equipment of digital satellite television system, top box of digital machine has entered into huge numbers of families.Digital satellite machine
Top box is mainly made up of some such as amplifier, frequency converter, demodulator, decoder, CPU, expansion interface and power supplys.Wherein,
LNB (low noise block downconverter or the tuner, English full name being made up of amplifier and frequency converter etc.：Low NoiseBlock) be
The critical component of top box of digital machine, frequency reducing can be carried out to high-frequency satellite-signal, noise filtering and enhanced processing are crossed, so that really
Environment protecting type TV set receives clearly vision signal.
Under normal circumstances, the voltage needed for television terminal directly provides normal work by LNB power supply circuits to LNB, LNB
Power supply safety will directly affect the work safety of top box of digital machine and television terminal.Fig. 1 is a kind of common satellite television
The structural representation of system.As shown in figure 1, the system includes top box of digital machine 100 and coupled television terminal
200.Wherein, top box of digital machine 100 includes being configured with power management chip 201 in LNB equipment 101, television terminal 200, electricity
Source control chip includes multiple connected power supply modules, specifically include for LNB equipment 101 power LNB power supply modules 2011,
The USB power supply modules 2012 powered for television terminal USB interface, it is that the eMMC that television terminal multimedia storage card interface is powered is supplied
Electric module 2013 and for television terminal SoC (on-chip system, English full name：System on Chip) SoC of power supply powers mould
Block 2014 etc..Each power supply module is integrated in power management chip due to more than, therefore, and any one power supply module occurs
Failure will all influence the power supply safety of other power supply modules.
During installing, using LNB equipment LNB short circuit phenomenons may occur for user, when LNB equipment 101 occurs
When short-circuit, Voltage Drop occurs in the output end for the LNB power supply modules 2011 being connected with LNB equipment 101 so that LNB powers mould
The voltage of the input of block 2011 (main power source) falls therewith, so as to cause the electricity of other power supply modules in power management chip 201
There is Voltage Drop phenomenon in source voltage.When below Voltage Drop to the normal working voltage of each power supply module, TV is whole
The serious system failure or even deadlock occurs in end, therefore, is provided effectively for LNB power supply circuits in LNB power supply modules 2011
Normal operation of the short-circuit protection for ensureing television terminal is vital.
The content of the invention
This application provides a kind of supplying power for tuner control circuit, system and top box of digital machine, caused with solving LNB short circuits
The problem of other power supply module Voltage Drops of power management chip.
In a first aspect, controlling circuit this application provides a kind of supplying power for tuner, the supplying power for tuner controls circuit bag
Energization input and power supply output end are included, the energization input is connected with main power source, the power supply output end and tuner
Energization input be connected, in addition to：
Voltage conversion unit, the first supply voltage for main power source to be inputted is converted to higher than first supply voltage
Second source voltage；
Switch control unit, detects for the output voltage to the power supply output end, is in the output voltage
During loaded work piece voltage, the first control signal is exported, when the output voltage is load short circuits voltage, the control letter of output second
Number；
Between power switch unit, the energization input for being arranged at the voltage conversion unit and the tuner, it is used for
Turned off when receiving the second control signal of switch control unit output, receiving the first control of switch control unit output
Turned on during signal processed, and the supply voltage of output high frequency tuner.
Second aspect, present invention also provides a kind of supplying power for tuner control system, the electric power supply control system include with
Upper supplying power for tuner controls circuit.
The third aspect, present invention also provides a kind of top box of digital machine, the top box of digital machine is supplied including above tuner
Electric control system.
The application's has the beneficial effect that：
The application provides a kind of supplying power for tuner control circuit, system and top box of digital machine, wherein, circuit includes：This Shen
It please provide a kind of supplying power for tuner and control circuit, including：Voltage conversion unit, switch control unit and power switch list
Member, voltage conversion unit is used for the first supply voltage for inputting main power source and is converted to second source higher than the first supply voltage
Voltage；Switch control unit is used to detect the output voltage for output end of powering, and is loaded work piece voltage in output voltage
When, the first control signal is exported, when output voltage is load short circuits voltage, the second control signal is exported；Power switch unit
For being turned off when receiving the second control signal of switch control unit output, the of switch control unit output is being received
Turned on during one control signal, and the supply voltage of output high frequency tuner.The application is defeated to power supply output end by switch control unit
Go out the detection of voltage to detect whether tuner occurs short circuit phenomenon, once short circuit occurs for tuner, switch control unit is then defeated
Go out the second control signal, power switch unit can break tuner power-supplying circuit in control ShiShimonoseki of the second control signal,
So that the energization input of supplying power for tuner control circuit is not powered by it, output end voltage falls and influenceed, so as to ensure power supply
The supply voltage of the power supply module of other in managing chip keeps stable state, it is ensured that the normal operation of television terminal.
Brief description of the drawings
In order to illustrate more clearly of the technical scheme of the application, letter will be made to the required accompanying drawing used in embodiment below
Singly introduce, it should be apparent that, for those of ordinary skills, without having to pay creative labor,
Other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of structural representation of common satellite TV system；
Fig. 2 controls the structural representation of circuit for a kind of supplying power for tuner that the embodiment of the present application is provided；
Fig. 3 controls the structural representation of circuit for another supplying power for tuner that the embodiment of the present application is provided；
Fig. 4 controls the basic circuit structure schematic diagram of circuit for a kind of supplying power for tuner that the embodiment of the present application is provided.
Embodiment
Here exemplary embodiment will be illustrated in detail, its example is illustrated in the accompanying drawings.Following description is related to
During accompanying drawing, unless otherwise indicated, the same numbers in different accompanying drawings represent same or analogous key element.Following exemplary embodiment
Described in embodiment do not represent and the consistent all embodiments of the present invention.On the contrary, they be only with it is such as appended
The example of the consistent apparatus and method of some aspects be described in detail in claims, the present invention.
For in the prior art, caused by LNB short circuits the problem of Voltage Drop, this application provides a kind of supplying power for tuner
Circuit is controlled, effective short-circuit protection can be provided for LNB power supply circuits, its central principle is：Pass through switch control unit 20
The power supply output end for controlling circuit to supplying power for tuner is detected, when load short circuits occur for output end of powering, generation second
The signal level of control signal, power switch unit 30 when receiving the second control signal, shut-off main power source and tuner it
Between power supply circuit so that the energization input of supplying power for tuner control circuit is not powered the shadow that falls of output end voltage by it
Ring, so as to ensure that the supply voltage of other power supply modules in power management chip 201 keeps stable state.
Based on above-mentioned principle, circuit provided in an embodiment of the present invention will be described in detail below.Fig. 2 is that the application is real
A kind of supplying power for tuner for applying example offer controls the structural representation of circuit.The LNB power-supplying circuits can be applied to each germline
In the LNB electric power supply control systems of row, the LNB electric power supply control systems can be applied in various serial top box of digital machines again.Such as Fig. 2
Shown, as one embodiment of the application, the circuit mainly includes voltage conversion unit 10, switch control unit 20 and electricity
Source switch unit 30, in addition, the energization input of the circuit is connected with main power source, the power supply output end and tuner of the circuit
Energization input be connected.
The input of voltage conversion unit 10 is the energization input Vin that supplying power for tuner controls circuit, with main power source phase
Connection；The output end of voltage conversion unit 10 is connected with the input of power switch unit 30.Voltage conversion unit 10 is used for
The first supply voltage that main power source is inputted is converted to the second source voltage higher than first supply voltage.Normal conditions,
Main power source is 12V for the voltage that LNB power supply circuits are provided, the supply voltage of the LNB after LNB power supply circuits are changed into 15V,
And second source voltage is then the magnitude of voltage being located between 12V and 15V.
The input of switch control unit 20 is connected with the output end of power switch unit 30, switch control unit 20
Output end is connected with the control end of power switch unit 30.Switch control unit 20 is used for the output to power switch unit 30
Voltage is detected, when output voltage is loaded work piece voltage, exports the first control signal, is load short circuits in output voltage
During voltage, the second control signal is exported.In the present embodiment, loaded work piece voltage is LNB normal working voltage (15V), load
Short-circuit voltage is LNB short-circuit voltage (0V).
The input of power switch unit 30 is connected with the output end of voltage conversion unit 10；Power switch unit 30
Output end is the power supply output end vo ut that supplying power for tuner controls circuit, is connected with the energization input of tuner；Power supply is opened
The control end for closing unit 30 is connected with the output end of switch control unit 20.Power switch unit 30 is arranged at supplying power for tuner
Control between the energization input of circuit and power supply output end, its on off state directly decides whole supplying power for tuner control electricity
The on off state on road.If what power switch unit 30 was received is the second control signal that switch control unit 20 is exported,
Show that now LNB is in short-circuit condition, power switch unit 30 is by the disconnected supplying power for tuner in control ShiShimonoseki of the second control signal
Circuit is controlled, so that the Voltage Drop problem for preventing LNB short circuits from causing；If what power switch unit 30 was received is switch control
The first control signal that unit 20 processed is exported, then show that now LNB is in normal operating conditions, and power switch unit 30 will be the
It is in the conduction state under the control of one control signal, and by the supply voltage that second source voltage conversion is tuner, output is extremely
The energization input of tuner, the supply voltage (15V) of normal work is provided for tuner.
Circuit is controlled this application provides a kind of supplying power for tuner, including：Voltage conversion unit 10, switch control unit 20
And power switch unit 30, switch control unit 20 to detect tuner is by the detection to output end output voltage of powering
No generation short circuit phenomenon, once short circuit occurs for tuner, switch control unit 20 then exports the second control signal, power switch list
Member 30 can break tuner power-supplying circuit in control ShiShimonoseki of the second control signal so that supplying power for tuner control circuit
Energization input is not fallen by its power supply output end voltage to be influenceed, so as to ensure the power supply mould of other in power management chip 201
The supply voltage of block keeps stable state, it is ensured that the normal operation of television terminal.In addition, in embodiments of the present invention, utilizing
Switch control unit 20 realizes that hardware is turned off in short circuit, without chip controls, while simplifying circuit structure, reduces circuit
Power consumption.
Fig. 3 controls the structural representation of circuit for another supplying power for tuner that the embodiment of the present application is provided.Can by Fig. 3
See, in order to realize the control function to power switch unit 30, switch control unit 20 also includes the He of voltage detecting subelement 201
Voltage controls subelement 202.Voltage detecting subelement 201 be used for it is described power supply output end output voltage detect,
When the output voltage is loaded work piece voltage, first detection signal is exported, when the output voltage is load short circuits voltage,
Output second detects signal.Voltage control subelement 202 is used to export the first control signal when receiving the first control signal,
The second control signal is exported when receiving the second control signal.
In the present embodiment, voltage control subelement 202 includes control chip, and the input of control chip is voltage detecting
The detection signal that subelement 201 is exported, output end is control signal.In tuner normal work, voltage detecting subelement 201
Low level first detection signal is exported, the first control signal of high level is exported after the conversion of control chip；In load
When short-circuit, the second detection signal of the output high level of voltage detecting subelement 201 exports low electricity after the conversion of control chip
The second flat control signal.Power switch unit 30 can be in the conduction state under the control of high level signal；In low level
State is off under the control of signal.
In addition, in order to turn off or turn on supplying power for tuner control circuit, power switch under control of the control signal
Unit 30 specifically includes the first power switch subelement 301 and second source switch subelement 302.Wherein, the first power switch
The input of subelement 301 is connected with the output end of switch control unit 20.In tuner normal work, switch control unit
20 the first control signals of output, the first power switch subelement 301 can be held on shape under the control of the first control signal
State；In load short circuits, switch control unit 20 exports the second control signal, and the first power switch subelement 301 can be the
It is held off under the control of two control signals.
Second source switch subelement 302 is arranged between voltage conversion unit 10 and supplying power for tuner input, specifically
, the input of second source switch subelement 302 is connected with the output end of voltage conversion unit 10；Output end and tuner
Energization input is connected；Control end is connected with the output end of the first power switch subelement 301.First power switch subelement
301 can control the on off state of second source switch subelement 302 by the on off state of itself.Specifically, when the first electricity
When source switch subelement 301 is in the conduction state, the second source switch conducting supplying power for tuner control circuit of subelement 302；When
When first power switch subelement 301 is off state, the second source switch shut-off supplying power for tuner control electricity of subelement 302
Road.
Fig. 4 controls the basic circuit structure schematic diagram of circuit for a kind of supplying power for tuner that the embodiment of the present application is provided.By
Fig. 4 is visible, and voltage detecting subelement 201 mainly includes：Load resistance R201, divider resistance R202, NPN type triode Q21 with
And pull-up resistor R203.Voltage control subelement 202 includes input pin XIRQ1 and output pin XIRQ2, and voltage detecting is single
The level signals of the output of member 201 enter control chip through input pin XIRQ1, then transmit to power supply and open through output pin XIRQ2
Close unit 30.
In voltage detecting subelement 201, load resistance R201 is the input of voltage detecting subelement 201, load resistance
R201 one end is connected with the output end of power switch unit 30, and the other end is grounded by divider resistance R202, load resistance
R201 and divider resistance R202 common port are connected with triode Q21 base stage；Triode Q21 grounded emitter, triode
Q21 colelctor electrode passes through pull-up resistor R203 connection power supplies, triode Q21 colelctor electrode and pull-up resistor R203 connection
Hold as the output end of voltage detecting subelement 201.Divider resistance R202 can be on load sharing resistance R201 voltage, to prevent negative
The electric current for carrying resistance R201 outputs is excessive, punctures triode Q21.
In the present embodiment, the output voltage of power switch unit 30 can be converted into triode Q21 by load resistance R201
The electric current of base stage.In tuner normal work, load resistance R201 has electric current process so that triode Q21 base stage and hair
There is pressure difference between emitter-base bandgap grading, now, triode Q21 conductings, power supply is grounded by pull-up resistor R203, voltage detecting subelement
201 export low level first detection signal to input pin XIRQ1, and control chip receives low level first detection letter
After number, output pin XIRQ2 is placed in high level, the first control signal of high level is exported.In load short circuits, load resistance
R201 does not have electric current process, triode Q21 shut-offs, the second detection signal of the output high level of voltage detecting subelement 201, control
Chip is received after the second detection signal, exports low level second control signal.
In addition, in the present embodiment, voltage detecting subelement 201 can also include filter capacitor C21, filter capacitor C21's
One end is connected with triode Q21 colelctor electrode and pull-up resistor R203 common port, and other end ground connection, filter capacitor C21 is used
In removing high frequency spurs, so that it is guaranteed that the stability for the level signal that voltage detecting subelement 201 is exported.
Further, the first power switch subelement 301 includes load resistance R301, pull-up resistor R302 and NPN type three
Pole pipe Q31, wherein, load resistance R301 one end is connected with triode Q31 base stage, and the other end connects with switch control unit 20
Connect, be the control end of the first power switch subelement 301；Pull-up resistor R302 one end is connected with triode Q31 colelctor electrode, separately
One end is connected with second source switch subelement 302, is the input of the first power switch subelement 301；Triode Q31 hair
Emitter grounding.
Second source switch subelement 302 includes load resistance R303, NPN type triode Q32 and PMOS Q33, wherein,
The output end of load resistance R303 one end and NPN type triode Q32 emitter stage with voltage conversion unit 10 is connected；Three poles
Pipe Q32 base stage and PMOS Q33 source electrode are connected with the load resistance R303 other ends；Triode Q32 colelctor electrode and
Input of the PMOS Q33 drain electrode with the first power switch subelement 301 is connected；PMOS Q33 grid is controlled with switch
Unit 20 processed is connected, and is that second source switchs the output end of subelement 302, while being also the output that supplying power for tuner controls circuit
End.The present embodiment can also set load resistance R304, and load resistance R304 is in parallel with load resistance R303.
In tuner normal work, output pin XIRQ2 exports the first control signal of high level, now, triode
There is pressure difference between Q31 base stage and emitter stage, triode Q31 is in the conduction state, PMOS Q33 drain voltage is 0, this
When, PMOS Q33 is in the conduction state, and PMOS Q33 output end exports supply voltage to tuner.In the normal work of tuner
When making, the electric current very little of the terminal circuits of load resistance R303 two, it is impossible to meet triode Q32 turn-on condition, now, triode
Q32 is in cut-off state.
When tuner is short-circuit, output pin XIRQ2 exports low level second control signal, now, at triode Q31
In cut-off state, because the electric current of the terminal circuits of load resistance R303 two increased dramatically, triode Q32 is changed into conducting from cut-off state
State so that PMOS Q33 drain voltage is more than source voltage, PMOS Q33 is changed into cut-off state from conducting state, so that
Turn off the circuit between voltage conversion unit 10 and the energization input of tuner, it is to avoid tuner short circuit phenomenon influences main power source
Supply voltage.
In addition, start PMOS Q33 when, it is possible that voltage output it is too fast or impact the problem of, excessive voltage meeting
Influence the supplying power for tuner control normal voltage output of circuit.Therefore, in the embodiment of the present invention, second source switch subelement
302 can also include divider resistance R305 and decompression current limiting capacitance C31, wherein, divider resistance R305 one end and voltage conversion
The output end connection of unit 10, the other end and triode Q32 colelctor electrode, PMOS Q33 drain electrode, the first power switch are single
One end connection of the input and the decompression current limiting capacitance C31 of member 301；It is depressured current limiting capacitance the C31 other end and high frequency
The energization input of head is connected, and is the output end that supplying power for tuner controls circuit.Divider resistance R305 and decompression current limiting capacitance
C31 can share a part of voltage of the output of voltage conversion unit 10, be conducive to PMOS Q33 to realize soft start, prevent PMOS
Pipe Q33 voltage outputs are too fast or impact phenomenon.
During supplying power for tuner control circuit use, inevitably there is metal-oxide-semiconductor, triode and control core
The damage phenomenon of the electronic components such as piece, influences the unlatching, shut-off of this circuit, or even loses the protective effect to LNB power supply circuits.
Thus, in the embodiment of the present invention, second source switch subelement 302 can also include fuse F1, fuse F1 one end with
PMOS Q33 grid connection, the other end is the output end that supplying power for tuner controls circuit.In the present embodiment, when tuner is supplied
In electric control circuit during electronic component failure, supplying power for tuner control electricity can be still turned off by fuse F1 fusing
Road, so that protect the supply voltage of main power source is not influenceed by tuner short circuit.
The application detects whether tuner is sent out by the detection of 20 pairs of power supply output end output voltages of switch control unit
Raw short circuit phenomenon, once short circuit occurs for tuner, switch control unit 20 then exports the second control signal, power switch unit 30
Can be broken tuner power-supplying circuit in control ShiShimonoseki of the second control signal so that supplying power for tuner controls the power supply of circuit
Input is not fallen by its power supply output end voltage to be influenceed, so as to ensure the power supply of the power supply module of other in power management chip
Voltage keeps stable state, it is ensured that the normal operation of television terminal.
In addition, the application also provides a kind of supplying power for tuner control system, the electric power supply control system includes above high frequency
Head power-supplying circuit.
Further, the application also provides a kind of top box of digital machine, and the top box of digital machine includes above supplying power for tuner control
System processed.
Between the embodiment of each in this specification identical similar part mutually referring to.Invention described above is real
The mode of applying is not intended to limit the scope of the present invention..
Claims (10)
1. a kind of supplying power for tuner controls circuit, it is characterised in that the supplying power for tuner control circuit includes energization input
With power supply output end, the energization input is connected with main power source, the energization input of the power supply output end and tuner
It is connected, in addition to：
Voltage conversion unit 10, the first supply voltage for main power source to be inputted is converted to higher than first supply voltage
Second source voltage；
Switch control unit 20, detects for the output voltage to the power supply output end, is negative in the output voltage
When carrying operating voltage, the first control signal is exported, when the output voltage is load short circuits voltage, the control letter of output second
Number；
Power switch unit 30, is arranged between the voltage conversion unit 10 and the energization input of the tuner, is used for
Turned off when receiving the second control signal of the output of switch control unit 20, receiving the of the output of switch control unit 20
Turned on during one control signal, and the supply voltage of output high frequency tuner.
2. circuit according to claim 1, it is characterised in that the switch control unit 20 includes：
Voltage detecting subelement 201, detects for the output voltage to the power supply output end, is in the output voltage
During loaded work piece voltage, first detection signal is exported, when the output voltage is load short circuits voltage, the detection letter of output second
Number；
Voltage controls subelement 202, for exporting the first control signal when receiving the first control signal, is receiving second
The second control signal is exported during control signal.
3. circuit according to claim 1, it is characterised in that the power switch unit 30 includes：First power switch
Subelement 301 and second source switch subelement 302, wherein,
The input of the first power switch subelement 301 is connected with the output end of the switch control unit 20, and described
The control end that the output end of one power switch subelement 301 switchs subelement 302 with the second source is connected；
The input of second source switch subelement 302 is connected with the output end of the voltage conversion unit 10, and described the
The output end of two power switch subelements 302 and the energization input of tuner are connected.
4. circuit according to claim 2, it is characterised in that the voltage detecting subelement 201 includes：Load resistance
R201, divider resistance R202, NPN type triode Q21 and pull-up resistor R203, wherein,
One end of the load resistance R201 is the input of the voltage detecting subelement 201, the load resistance R201's
The other end is grounded by divider resistance R202, the load resistance R201 and the divider resistance R202 common port and described three
Pole pipe Q21 base stage connection；
The grounded emitter of the triode Q21, the colelctor electrode of the triode Q21 passes through pull-up resistor R203 connections power supply electricity
Source, the colelctor electrode of the triode Q21 and the output that pull-up resistor R203 connection end is the voltage detecting subelement 201
End.
5. circuit according to claim 3, it is characterised in that the first power switch subelement 301 includes load electricity
R301, pull-up resistor R302 and NPN type triode Q31 are hindered, wherein,
Described load resistance R301 one end is connected with the base stage of the NPN type triode Q31, and the other end is that first power supply is opened
The control end of climax unit 301；
Described pull-up resistor R302 one end is connected with the colelctor electrode of the NPN type triode Q31, and the other end is first power supply
Switch the input of subelement 301, the grounded emitter of the NPN type triode Q31.
6. circuit according to claim 3, it is characterised in that the second source switch subelement 302 includes load electricity
R303, NPN type triode Q32 and PMOS Q33 are hindered, wherein,
One end of the load resistance R303 and the NPN type triode Q32 emitter stage with the voltage conversion unit 10
Output end connection；
The base stage of the NPN type triode Q32 and the PMOS Q33 source electrode connect with the load resistance R303 other ends
Connect；
The colelctor electrode of the NPN type triode Q32 and the PMOS Q33 drain electrode with the first power switch subelement
301 input connection；
The grid of the PMOS Q33 is the output end that the second source switchs subelement 302.
7. circuit according to claim 6, it is characterised in that the second source switch subelement 302 also includes insurance
Silk F1, one end of the fuse F1 is connected with the grid of the PMOS Q33, and the other end is that the supplying power for tuner controls electricity
The output end on road.
8. circuit according to claim 6, it is characterised in that the second source switch subelement 302 also includes partial pressure
Resistance R305 and decompression current limiting capacitance C31, wherein,
One end of the divider resistance R305 is connected with the output end of the voltage conversion unit 10, the other end and the NPN type
Triode Q32 colelctor electrode, the draining of the PMOS Q33, the input of the first power switch subelement 301 and institute
State decompression current limiting capacitance C31 one end connection；
The other end of the decompression current limiting capacitance C31 controls the output end of circuit for the supplying power for tuner.
9. a kind of supplying power for tuner control system, it is characterised in that the electric power supply control system is included as claim 1-8 is any
Supplying power for tuner control circuit described in.
10. a kind of top box of digital machine, it is characterised in that the top box of digital machine is supplied including tuner as claimed in claim 9
Electric control system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710542233.8A CN107197184B (en) | 2017-07-05 | 2017-07-05 | Tuner power supply control circuit, system and digital set-top box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN107197184B (en) | 2020-05-15 |
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