CN206164702U - Current switching circuit, TV power board, TV mainboard and TV - Google Patents
Current switching circuit, TV power board, TV mainboard and TV Download PDFInfo
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- CN206164702U CN206164702U CN201621196482.3U CN201621196482U CN206164702U CN 206164702 U CN206164702 U CN 206164702U CN 201621196482 U CN201621196482 U CN 201621196482U CN 206164702 U CN206164702 U CN 206164702U
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Abstract
The utility model discloses a current switching circuit, TV power board, TV mainboard and TV, current switching circuit include diode, ON -OFF control circuit, voltage input end, the 2nd voltage input end and load link, the negative pole connected load link of the positive pole of diode, diode is connected to voltage input end, ON -OFF control circuit has first link, second link and is used for the switching signal's who switches on or turn -off between defeated first link of entry control and the second link switching signal input, the 2nd voltage input holds linked switch control circuit's first link, switch control circuit's second link connected load link. Adopt the utility model discloses can switch the electric current that offers the load in a flexible way, improve the reliability of circuit, and effectively practice thrift resource and use cost.
Description
Technical field
The utility model is related to electronic technology field, more particularly to a kind of current switch circuit, television power panel, TV master
Plate and TV.
Background technology
During power supply powering load, it is possible that the operating current needed for load is more than the maximum output current of power supply
Situation, at this moment, power supply will be unable to meet the need for electricity of load again, cause the load cannot normal work.By taking TV applications as an example,
Television power panel has standby voltage output end and start voltage output end, respectively to the standby load in television board and start
Load supplying.Generally, the maximum output current of the standby voltage output end of traditional tv power panel is 500mA or so, Neng Gouman
The need for electricity of standby load in sufficient traditional tv board.However, with the development of science and technology, intelligent television board arises at the historic moment,
Compared to traditional tv board, the standby charging circuits of MHL, WIFI wake-up circuits are increased in intelligent television board and is quickly opened
The multi-functional standby load such as electromechanical road, these functional circuits operating current required when working is 1500mA or so, therefore, tradition
Television power panel cannot again meet its need for electricity.
The existing scheme that solves the above problems is that customized again according to the operating current for connecing load and needing can be direct
The power supply of output high current, for example customizing standby output end can directly export the Novel television power panel of high current to match intelligence
Television board.In customization procedure, original power supply will go out of use, and need to redesign circuit construction of electric power and the various electricity of calculating
Road parameter, need to expend substantial amounts of man power and material, waste resource, and considerably increase use cost.
Utility model content
Technical problem to be solved in the utility model is, there is provided a kind of current switch circuit, television power panel, TV
Mainboard and TV, can more effectively avoid the maximum current that can be exported because of power supply from meeting on the premise of cost-effective
Load needed for operating current, and cause load cannot normal work problem.
In order to solve above-mentioned technical problem, the one side of the utility model embodiment provides a kind of current switch circuit.
The present embodiment provide current switch circuit include diode, ON-OFF control circuit, first voltage input, second
Voltage input end and load connection end；
The first voltage input connects the positive pole of the diode, and the negative pole connection load of the diode connects
Connect end；
The ON-OFF control circuit has the first connection end, the second connection end and for input control first connection end
And the switching signal input of the switching signal of the on or off between second connection end；The second voltage input
Connect the first connection end of the ON-OFF control circuit, the second connection end connection load connection of the ON-OFF control circuit
End.
Preferably, the ON-OFF control circuit includes metal-oxide-semiconductor, pull-up resistor and triggers circuit；
The drain electrode of the metal-oxide-semiconductor is the first connection end of the ON-OFF control circuit, and source electrode is the ON-OFF control circuit
The second connection end；
The first end of the pull-up resistor is used to access DC power signal, and the second end connection of the pull-up resistor is described
The grid of metal-oxide-semiconductor；
The triggers circuit has trigger input, triggering end and earth terminal；The trigger input is institute
The switching signal input of ON-OFF control circuit is stated, the triggering end connects the second end of the pull-up resistor, the earth terminal
Ground connection.
Preferably, the first voltage input is also connected with the second end of the pull-up resistor.
Preferably, the metal-oxide-semiconductor is PMOS.
Preferably, the triggers circuit includes first resistor and NPN triode；
The first end of the first resistor is the trigger input of the triggers circuit, the second of the first resistor
The base stage of the end connection NPN triode；The triggering end of the extremely described triggers circuit of the current collection of the NPN triode, emitter stage
For the earth terminal of the triggers circuit.
Preferably, the current switch circuit also includes second resistance；
The first end of the second resistance connects the first end of the pull-up resistor, the second end connection of the second resistance
The trigger input of the triggers circuit.
Preferably, the current switch circuit also includes the first electric capacity and 3rd resistor；
The positive pole of first electric capacity connects the source electrode of the metal-oxide-semiconductor, and the negative pole of first electric capacity connects the metal-oxide-semiconductor
Grid；Also,
Second end of the pull-up resistor connects the grid of the metal-oxide-semiconductor and is specially：
Second end of the pull-up resistor connects the first end of the 3rd resistor, the second end connection of the 3rd resistor
The grid of the metal-oxide-semiconductor.
The other side of the utility model embodiment also provides a kind of television power panel, including power supply mainboard and above-mentioned reality
Apply the current switch circuit that example is provided；Load connection end in the current switch circuit is used to connect the standby of television board
Load power source end；
The power supply mainboard has standby voltage output end, start voltage output end and switching on and shutting down signal input part；It is described
Standby voltage output end connects the first voltage input of the current switch circuit, and the start voltage output end connection is described
The second voltage input of current switch circuit, the switching on and shutting down signal input part connects the switching letter of the current switch circuit
Number input；The start voltage output end is additionally operable to connect the start load power source end of the television board, the switching on and shutting down
Signal input part is additionally operable to connect the switching on and shutting down signal output part of the television board.
The another aspect of the utility model embodiment also provides a kind of TV motherboard, including television board and above-mentioned enforcement
The current switch circuit that example is provided；
The television board has standby load power end, start load power source end and switching on and shutting down signal output part；It is described
Standby load power end connects the load connection end of the current switch circuit, and the start load power source end connects the electric current
The second voltage input of switching circuit, the switching signal that the switching on and shutting down signal output part connects the current switch circuit is defeated
Enter end；
The first voltage input of the current switch circuit is additionally operable to connect the standby voltage output end of television power panel,
The second voltage input is additionally operable to connect the start voltage output end of the television power panel, the switching signal input
It is additionally operable to connect the switching on and shutting down signal input part of the television power panel.
Another aspect of the utility model embodiment also provides a kind of TV, including power supply mainboard, television board and on
State the current switch circuit that embodiment is provided；
The power supply mainboard has standby voltage output end, start voltage output end and switching on and shutting down signal input part；It is described
Television board has standby load power end, start load power source end, switching on and shutting down signal output part；
The standby voltage output end of the power supply mainboard connects the first voltage input of the current switch circuit, described
The start voltage output end of power supply mainboard connects the second voltage input of the current switch circuit and the television board
Start load power source end, the switching signal of the switching on and shutting down signal input part connection current switch circuit of the power supply mainboard is defeated
Enter the switching on and shutting down signal output part of end and the television board；The load connection end of the current switch circuit connects the TV
The standby load power end of board.
Implement the utility model, have the advantages that：
The current switch circuit that the utility model embodiment is provided, first voltage input is loaded by diode connection
Connection end, and ON-OFF control circuit is set between second voltage input and load connection end, by switching signal input
The on or off that input signal is come between the first connection end of controlling switch control circuit and the second connection end, and then control the
Two voltage input ends and the connected state of load connection end, when the input signal of switching signal input is low level signal,
Turn off between first connection end and the second connection end of ON-OFF control circuit, only carried for load connection end by first voltage input
For electric current, when the input signal of switching signal input is high level signal, the first connection end of ON-OFF control circuit and the
Turn off between two connection ends, electric current is provided to load connection end jointly by first voltage input and second voltage input, with
Load connection end is set to be obtained in that bigger electric current, therefore, the utility model embodiment can neatly switch and be supplied to load
Electric current.In addition, the utility model also provides a kind of television power panel, TV motherboard and TV, on the basis of original circuit
Power supply switch circuit is set up, energy effectively solving cannot meet the required operating current of load because of the maximum current that power supply can be exported
When caused by load cannot normal work problem, improve the reliability of circuit, and be effectively saved resource and use into
This.
Description of the drawings
Fig. 1 is the structural representation of the one embodiment for the current switch circuit that the utility model is provided；
Fig. 2 is the structural representation of second embodiment of the current switch circuit that the utility model is provided；
Fig. 3 is the structural representation of the one embodiment for the television power panel that the utility model is provided；
Fig. 4 is the structural representation of the one embodiment for the TV motherboard that the utility model is provided；
Fig. 5 is the structural representation of the one embodiment for the TV that the utility model is provided；
Fig. 6 is the structural representation of another embodiment of the TV that the utility model is provided.
Specific embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the utility model, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment for being obtained, belongs to the scope of the utility model protection.
Fig. 1 is referred to, is the structural representation of the one embodiment for the current switch circuit 10 that the utility model is provided.
Current switch circuit 10 in the present embodiment, including diode D1, ON-OFF control circuit 11, first voltage input
VIN1, second voltage input and load connection end Load；
The first voltage input VIN1Connect the positive pole of the diode D1, the negative pole connection institute of the diode D1
State load connection end Load；
The ON-OFF control circuit 11 has the first connection end, the second connection end and for input control first connection
The switching signal input S of the switching signal of the on or off between end and second connection endIN1；The second voltage
Input VIN2Connect the first connection end of the ON-OFF control circuit 11, the second connection end of the ON-OFF control circuit 11 connects
Meet the load connection end Load.
Wherein, diode D1 is used to prevent from pouring in down a chimney.
In the present embodiment, first voltage input VIN1It is additionally operable to connect the first DC power signal, the first dc source
Signal is used to provide voltage and current to load the load that connection end Load is connected by diode D1；Second voltage input
VIN2It is additionally operable to connect the second DC power signal, the second DC power signal is used to be whenever necessary load connection end Load
The oad freewheels for being connected；Load connection end Load is used for the power end that connection needs the load of electricity consumption.
In the present embodiment, switching signal input SIN1For being input into the first connection end of controlling switch control circuit 11
And second the on or off between connection end switching signal, i.e. for connecting switching signal source, when switching signal source sends
Switching signal be low level signal, only by first voltage input VIN1Power to load connection end Load, work as switching signal source
When the switching signal for sending is high level signal, illustrate only by first voltage input VIN1Power to load connection end Load
Demand cannot be met, needs are switched to by first voltage input VIN1With second voltage input VIN2It is common to give load connection end
Load powers.Specifically, from switching signal input SIN1The switching signal of input determines the first connection of ON-OFF control circuit 11
It is to turn on also to be off between end and the second connection end, such as switching signal input SIN1The switching signal of input is high electricity
At ordinary times, turn between first connection end and the second connection end of ON-OFF control circuit 11, as switching signal input SIN1Input
When switching signal is low level, turn off between first connection end and the second connection end of ON-OFF control circuit 11.
The operation principle of the current switch circuit 10 that the present embodiment is provided is as follows：
As first voltage input VIN1When upper electric, diode D1 forward conductions, first voltage input VIN1Connect for load
Meet end Load and voltage and current is provided.
If switching signal input SIN1Input signal be low level signal, the first connection end of ON-OFF control circuit 11
And second turn off between connection end, i.e. second voltage input VIN2Do not connect with load connection end Load, still only by first voltage
Input VIN1Voltage and current is provided to load connection end Load；If switching signal input SIN1Input signal be high level
Signal, turns on, second voltage input V between first connection end and the second connection end of ON-OFF control circuit 11IN2Connect with load
End Load connections are connect, now, if second voltage input VIN2It is normally upper electric, then switch to by second voltage input VIN2With
First voltage input VIN1Common to provide voltage and current to load connection end Load, now, load connection end Load can be obtained
Obtain bigger electric current.
Fig. 2 is referred to, is the structural representation of second embodiment of the current switch circuit 10 that the utility model is provided.
On the basis of the first embodiment shown in above-mentioned Fig. 1, further, the ON-OFF control circuit 11 includes MOS
Pipe Q1, pull-up resistor R and 111 circuits of triggering；
The drain D of the metal-oxide-semiconductor Q1 is the first connection end of the ON-OFF control circuit 11, and source S is the switch control
Second connection end of circuit processed 11；
The first end of the pull-up resistor R is used to access DC power signal Vcc, and second end of the pull-up resistor R connects
Connect the grid G of the metal-oxide-semiconductor Q1；
The triggers circuit 111 has trigger input, triggering end and earth terminal；The trigger input is
The switching signal input S of the ON-OFF control circuit 11IN1, the triggering end connects second end of the pull-up resistor R, institute
State earth terminal ground connection.
In the present embodiment, metal-oxide-semiconductor Q1 is used to control second voltage input VIN2And the company between load connection end Load
Logical state；Specifically, when metal-oxide-semiconductor Q1 is turned off, second voltage input VIN2Do not connect with load connection end Load, work as metal-oxide-semiconductor
When Q1 is turned on, second voltage input VIN2Connect with load connection end Load.Pull-up resistor R, in switching signal input
SIN1Input signal be non-high level signal when, be held off metal-oxide-semiconductor Q1, specifically, triggers circuit 111 touch
When originator is output as high level signal or does not export, by the current potential clamper of metal-oxide-semiconductor Q1 grid Gs in high level.Triggers circuit
111 are used for according to switching signal input SIN1Input signal control metal-oxide-semiconductor Q1 turn-on and turn-off；Specifically, when triggering electricity
(i.e. switching signal input S when the trigger input on road 111 detects low level signalIN1Input signal be low level
Signal), the triggering end of triggers circuit 111 is not connected with earth terminal, and the grid G of metal-oxide-semiconductor Q1 is pulled up resistance R and is pulled to high level
Signal, metal-oxide-semiconductor Q1 shut-offs；When the trigger input input high level signal of triggers circuit 111, (switching signal is input into
End SIN1Input signal be high level signal), the triggering end of triggers circuit 111 is connected with earth terminal, and triggering end is pulled low, and is entered
One step ground, second end of pull-up resistor R is pulled low, and yet further, the grid G of metal-oxide-semiconductor Q1 is pulled low, metal-oxide-semiconductor Q1 conductings.
The operation principle of the current switch circuit 10 that the present embodiment is provided is as follows：
As first voltage input VIN1When upper electric, diode D1 forward conductions, first voltage input VIN1Connect for load
Meet end Load and voltage and current is provided.
When electricity in the first end of pull-up resistor R, the second end is pulled to high level, and then the grid G of metal-oxide-semiconductor Q1 for height
Level, metal-oxide-semiconductor Q1 shut-offs, second voltage input VIN2Do not connect with load connection end Load；If switching signal input SIN1
Input signal be low level signal, the triggering end of triggers circuit 111 do not connect with earth terminal, and the grid G of metal-oxide-semiconductor Q1 still goes up
Pull-up resistor R is pulled to high level, and metal-oxide-semiconductor Q1 is held off, second voltage input VIN2Keep not connecting with load connection end Load
It is logical, still only by first voltage input VIN1Voltage and current is provided to load connection end Load；If switching signal input SIN1
Input signal be high level signal, the triggering end of triggers circuit 111 connects with earth terminal, and triggering end is pulled low, further,
Second end of pull-up resistor R is pulled low, and yet further, the grid G of metal-oxide-semiconductor Q1 is pulled low, metal-oxide-semiconductor Q1 conductings, second voltage
Input VIN2Connect with load connection end Load, now, if second voltage input VIN2Normal upper electricity, then switch to by the
Two voltage input end VIN2With first voltage input VIN1It is common to provide voltage and current to load connection end Load, now, bear
Carrying connection end Load can obtain bigger electric current.
Preferably, the first voltage input VIN1It is also connected with the first end of the pull-up resistor R.
It should be noted that for pull-up resistor R, it is only necessary to there is a suitable DC power signal to carry to its first end
For a high level signal so as to pulled on to high level at the second end.However, this DC power signal can be independent
The external power supply of connection, or directly with circuit inside the shared power supply in other ports.
In the present embodiment, from directly by first voltage input VIN1The DC power signal for being connected is to pull-up
The first end of resistance R provides the scheme of high level signal, saves circuit cost.
Preferably, the metal-oxide-semiconductor Q1 is PMOS.
Preferably, the triggers circuit 111 includes first resistor and NPN triode；
The first end of the first resistor is the trigger input of the triggers circuit 111, the first resistor
Second end connects the base stage of the NPN triode；The triggering end of the extremely described triggers circuit 111 of the current collection of the NPN triode,
The earth terminal of the extremely described triggers circuit 111 of transmitting.
In the present embodiment, as switching signal input SIN1Input signal be low level signal when, triode cut
Only；As switching signal input SIN1Input signal be high level signal when, the voltage on transistor base be more than its emitter junction
Conducting voltage, triode ON, the collector and emitter connection of triode, the i.e. triggering end and earth terminal of triggers circuit 111
Connection.In addition, triode is current control device, it is therefore desirable to first resistor of connecting in base stage, to provide base to triode
Electrode current.
Preferably, the current switch circuit 10 also includes second resistance；
The first end of the second resistance connects the first end of the pull-up resistor R, and the second end of the second resistance connects
Connect the trigger input of the triggers circuit 111.
It should be noted that in actual applications, because switching signal source has differences, therefore, switching signal input
SIN1The maximum output current that can be provided of input signal be possible to that the operating current needed for triode cannot be met.
In the present embodiment, second resistance is set up, and the first end of pull-up resistor R is triggered by second resistance connection
The trigger input of circuit 111, the high level signal being input into by the first end of pull-up resistor R and switching signal input
SIN1The high level signal of input provides operating current to the base stage of triode jointly, can preferably avoid when switching signal is defeated
Enter to hold SIN1The maximum output current that can be provided of input signal when cannot meet the operating current needed for triode triode without
The problem of method normally, is effectively improved the reliability of circuit.
Preferably, the current switch circuit 10 also includes the first electric capacity and 3rd resistor；
The positive pole of first electric capacity connects the source S of the metal-oxide-semiconductor Q1, and the negative pole connection of first electric capacity is described
The grid of metal-oxide-semiconductor；Also,
Second end of the pull-up resistor R connects the grid G of the metal-oxide-semiconductor Q1 and is specially：
Second end of the pull-up resistor R connects the first end of the 3rd resistor, and the second end of the 3rd resistor connects
Connect the grid G of the metal-oxide-semiconductor Q1.
It should be noted that in the above-described embodiments, once switching signal input SIN1Input high level signal, metal-oxide-semiconductor
Q1 will at once be turned within the extremely short time, accordingly, it is possible to occur that metal-oxide-semiconductor Q1 has been turned on, but second voltage is input into
End VIN2The phenomenon for stably going up electricity is had not been completed, this can cause circuit unstable.
In the present embodiment, the first electric capacity and 3rd resistor are set up, the original that the voltage based on electric capacity two ends can not be mutated
Reason, the first electric capacity is used to adjust in switching signal input SIN1The conduction delay of metal-oxide-semiconductor Q1 after input high level signal, the 3rd
Resistance is charging resistor.As switching signal input SIN1Input high level signal when, the triggering end of triggers circuit 111 and connect
Ground terminal is connected, first voltage input VIN1The DC power signal of upper input is that the first electric capacity charges by 3rd resistor, first
The voltage at electric capacity two ends gradually increases from zero, when the voltage at the first electric capacity two ends increases to the cut-in voltage more than metal-oxide-semiconductor Q1,
Metal-oxide-semiconductor Q1 is just turned on, and the time used by the voltage from zero cut-in voltage for increasing to metal-oxide-semiconductor Q1 at the first electric capacity two ends is metal-oxide-semiconductor
The conduction delay of Q1, can adjust the length of this period, i.e., by the resistance of the capacitance and 3rd resistor that adjust the first electric capacity
This section of time delay can be utilized so that second voltage input VIN2Can complete stably to go up electricity, to ensure that circuit being capable of steady operation.
It should be noted that in the specific implementation, the current switch circuit 10 that above-described embodiment is provided can be used as one
Independent accessory, is individually printed on one piece of pcb board, is connected with other application circuit by pluggable mode；Or also may be used
To be integrated into an object with other application circuit, for example, when applying on TV, can produce what is provided with above-described embodiment
The television power panel of current switch circuit 10, the TV motherboard of the current switch circuit 10 provided with above-described embodiment or band
The TV of the current switch circuit 10 that above-described embodiment is provided.
Fig. 3 is referred to, is the structural representation of the one embodiment for the television power panel that the utility model is provided.
Television power panel in the present embodiment includes the current switch circuit 10 that power supply mainboard 20 and above-described embodiment are provided；
Load connection end Load in the current switch circuit 10 is used to connect the standby load power end of television board；
The power supply mainboard 20 has standby voltage output end VSTB, start voltage output end VMWith switching on and shutting down signal input
End POW_ON；Standby voltage output end VSTBConnect the first voltage input V of the current switch circuit 10IN1, it is described
Start voltage output end VMConnect the second voltage input V of the current switch circuit 10IN2, the switching on and shutting down signal input
End POW_ON connects the switching signal input S of the current switch circuit 10IN1；The start voltage output end VMIt is additionally operable to
Connect the start load power source end of the television board, the switching on and shutting down signal input part POW_ON is additionally operable to connect the TV
The switching on and shutting down signal output part of board.
In the present embodiment, current switch circuit 10 is integrated with power supply mainboard 20, constitutes belt current switching electricity
The connected mode of the television power panel on road 10, current switch circuit 10 and power supply mainboard 20 can be pluggable connection, it is also possible to
To be fixedly connected, the utility model is not especially limited.
It should be noted that television power panel is used to be powered to television board, usual television power panel needs to give TV plate
Card provides 5V standby voltages and 5V start voltages.Wherein, standby voltage output end V of the 5V standby voltages from power supply mainboard 20STBIt is defeated
Go out, standby voltage output end VSTBElectricity is still maintained under television standby state；Start electricity of the 5V start voltages from power supply mainboard 20
Pressure output end VMOutput, start shooting voltage output end VMOnly just there is electricity under television startup state, the power-off under television standby state,
I.e. when switching on and shutting down signal input part POW_ON input high level signals, start shooting voltage output end VMJust there is electricity.In addition, TV is electric
The start voltage that source plate can also provide 12V for television board, to meet the need for electricity of television board respective load, this practicality
It is new to be not especially limited.
Working condition when powering to television board to the television power panel that the present embodiment is provided below is described in detail.
When standby, the switching on and shutting down signal input part POW_ON input low level signals of power supply mainboard 20, the start voltage of power supply mainboard 20
Output end VMMetal-oxide-semiconductor Q1 shut-offs in power-off, and current switch circuit 10, standby voltage output end V of power supply mainboard 20STBIt is defeated
Go out the first voltage input V of 5V standby voltages to current switch circuit 10IN1, 5V standby voltages are by current switch circuit 10
In diode D1 provide voltage and current to load connection end Load, the obtainable maximum currents of load connection end Load are 5V
The maximum output current of standby voltage, for traditional tv board, needed for its standby load (such as infrared remote controller)
Operating current is less, thus the electric current that load connection end Load is provided can meet its need for electricity, standby load normal work；
For smart card, multi-functional standby load in the standby state on intelligent television board (such as WIFI wake-up circuits, fast
Fast wake-up circuit and the standby charging circuits of MHL) it is low-power consumption mode, thus the electric current that load connection end Load is provided also can expire
The need for electricity of sufficient its standby load, standby load normal work.During start, the switching on and shutting down signal input part of power supply mainboard 20
POW_ON input high level signals, start shooting voltage output end VMThe second voltage of output 5V start voltages to current switch circuit 10
Input VIN2, and the metal-oxide-semiconductor Q1 conductings in current switch circuit 10, therefore 5V standby voltages and 5V starts voltage are jointly to negative
Carry connection end Load and voltage and current is provided, load connection end Load can obtain bigger electric current, for traditional tv board
For, the operating current required for its standby load is less, therefore, even if power supply is provided for high current, it also only can disappear
The operating current itself being actually needed is consumed, the normal work of standby load is not affected, for intelligent television board, it is more
Function standby load enters mode of operation (for example carrying out WIFI wake-ups), and required electric current increases, and now, loads connection end
The high current that Load is provided for it, it is ensured that standby load normal work.
It can be seen that, the television power panel that the present embodiment is provided can neatly switch the electric current for being supplied to load, apply in electricity
Depending on field, that is, can be good at compatible traditional tv board and intelligent television board, with preferable versatility and compatibility.
Fig. 4 is referred to, is the structural representation of the one embodiment for the TV motherboard that the utility model is provided.
The TV motherboard that the present embodiment is provided includes the current switch circuit 10 that television board 30 and above-described embodiment are provided；
The television board 30 has standby load power end Load_STB, start load power source end Load_M and switching on and shutting down
Signal output part SOUT；The standby load power end Load_STB connects the load connection end of the current switch circuit 10
Load, the start load power source end Load_M connects the second voltage input V of the current switch circuit 10IN2, it is described to open
Off signal output end SOUTConnect the switching signal input S of the current switch circuit 10IN1；
The first voltage input V of the current switch circuit 10IN1The standby voltage for being additionally operable to connect television power panel is defeated
Go out end, the second voltage input VIN2It is additionally operable to connect the start voltage output end of the television power panel, the switching letter
Number input SIN1It is additionally operable to connect the switching on and shutting down signal input part of the television power panel.
In the present embodiment, current switch circuit 10 is integrated with television board 30, constitutes belt current switching electricity
The connected mode of the TV motherboard on road 10, current switch circuit 10 and television board 30 can be pluggable connection, or
It is fixedly connected, the utility model is not especially limited.
It should be noted that usually, multiple functional circuits are integrated with television board 30, are divided according to need for electricity,
Standby load and start load can be divided them into.With regard to standby load, as need to maintain electricity in the standby state
Load, the standby load on traditional tv board 30 includes infrared remote controller, the standby load bag on intelligent television board 30
Include infrared remote controller, WIFI wake-up circuits, quick turn-on circuit and the standby charging circuits of MHL.Load with regard to start, as only
Needs maintain the load of electricity under open state, in general, start on television board 30 load include TV governor circuits,
High frequency tuner circuit and random storage circuit, mainly illustrate traditional tv board 30 and intelligent television board 30 in standby load herein
On difference, to start shooting load be not added with describe in detail.In the present embodiment, the television board 30 in TV motherboard can be traditional tv
Board 30, or intelligent television board 30.
In the present embodiment, on the one hand the standby load power end Load_STB of television board 30 connects in television power panel
Current switch circuit 10 load connection end Load, be on the other hand additionally operable to connect television board 30 on standby load electricity
Source；On the one hand start load power source end Load_M connects the second voltage input V of current switch circuit 10IN2, on the other hand
It is additionally operable to connect the power end of the start load on television board 30.
Fig. 5 is referred to, is the structural representation of the one embodiment for the TV that the utility model is provided.
The TV includes the current switch circuit 10 that power supply mainboard 20, television board 30 and above-described embodiment are provided；
The power supply mainboard 20 has standby voltage output end VSTB, start voltage output end VMWith switching on and shutting down signal input
End POW_ON；The television board 30 has standby load power end Load_STB, start load power source end Load_M, switching on and shutting down
Signal output part SOUT；
Standby voltage output end V of the power supply mainboard 20STBConnect the first voltage input of the current switch circuit 10
End VIN1, the start voltage output end V of the power supply mainboard 20MConnect the second voltage input of the current switch circuit 10
VIN2With the start load power source end Load_M of the television board 30, the switching on and shutting down signal input part of the power supply mainboard 20
POW_ON connects the switching signal input S of the current switch circuit 10IN1It is defeated with the switching on and shutting down signal of the television board 30
Go out to hold SOUT；The load connection end Load of the current switch circuit 10 connects the standby load power end of the television board 30
Load_STB。
In the present embodiment, current switch circuit 10, television power panel and television board 30 are integrated, constitutes band
The TV of current switch circuit 10, the connected mode between current switch circuit 10, television power panel and television board 30
Can be pluggable connection, or it is fixedly connected, the utility model is not especially limited.
Fig. 6 is referred to, is the structural representation of another embodiment of the TV that the utility model is provided.In the present embodiment
The TV of offer has made further refinement on the basis of the TV that above-described embodiment is provided to its current switch circuit 10.
The operation principle of the TV that the present embodiment is provided is as follows：
When standby, standby voltage output end V of power supply mainboard 20STBOutput 5V standby voltages, pull-up resistor R is by metal-oxide-semiconductor Q1
Grid G be pulled to high level, metal-oxide-semiconductor Q1 shut-offs, second voltage input VIN2Do not connect with load connection end Load, with this
Meanwhile, first voltage input VIN1Upper electricity, diode D1 forward conductions, first voltage input VIN1To load connection end Load
Voltage and current, the standby load normal work on television board 30, in addition, the switching on and shutting down signal output of television board 30 are provided
End SOUTOutput low level signal, NPN triode Q2 cut-off, the grid G of metal-oxide-semiconductor Q1 is still pulled up resistance R and is pulled to high level,
Metal-oxide-semiconductor Q1 maintains shut-off, second voltage input VIN2Keep not connecting with load connection end Load, it is still only defeated by first voltage
Enter to hold VIN1Voltage and current is provided to load connection end Load；As the switching on and shutting down signal output part S of television board 30OUTOutput is high
Level signal, switching signal input SIN1The high level signal and first voltage input V of inputIN1The 5V standby voltages of input
Operating current is provided to NPN triode Q2 by first resistor R1 and second resistance R2, and causes the base stage electricity of NPN triode Q2
Pressure is more than its emitter junction conducting voltage, the conducting of NPN triode Q2, first voltage input VIN1The 5V standby voltages of input pass through
3rd resistor R3 is the first electric capacity C1 chargings, and after a period of time, the voltage at the first electric capacity C1 two ends reaches opening for metal-oxide-semiconductor Q1
Open voltage, metal-oxide-semiconductor Q1 conductings, second voltage input VIN2Connect with load connection end Load, switch to and be input into by second voltage
End VIN2With first voltage input VIN1It is common to provide voltage and current to load connection end Load, now, load connection end
Load can obtain bigger electric current, the standby load normal work on television board 30.
The current switch circuit that the utility model embodiment is provided, first voltage input is loaded by diode connection
Connection end, and ON-OFF control circuit is set between second voltage input and load connection end, by switching signal input
The on or off that input signal is come between the first connection end of controlling switch control circuit and the second connection end, and then control the
Two voltage input ends and the connected state of load connection end, when the input signal of switching signal input is low level signal,
Turn off between first connection end and the second connection end of ON-OFF control circuit, only carried for load connection end by first voltage input
For electric current, when the input signal of switching signal input is high level signal, the first connection end of ON-OFF control circuit and the
Turn off between two connection ends, electric current is provided to load connection end jointly by first voltage input and second voltage input, with
Load connection end is set to be obtained in that bigger electric current, therefore, the utility model embodiment can neatly switch and be supplied to load
Electric current.In addition, the utility model also provides a kind of television power panel, TV motherboard and TV, on the basis of original circuit
Power supply switch circuit is set up, energy effectively solving cannot meet the required operating current of load because of the maximum current that power supply can be exported
When caused by load cannot normal work problem, improve the reliability of circuit, and be effectively saved resource and use into
This.
The above is preferred embodiment of the present utility model, it is noted that for the ordinary skill of the art
For personnel, on the premise of without departing from the utility model principle, some improvement and deformation can also be made, these improve and become
Shape is also considered as protection domain of the present utility model.
Claims (10)
1. a kind of current switch circuit, it is characterised in that including diode, ON-OFF control circuit, first voltage input, second
Voltage input end and load connection end；
The first voltage input connects the positive pole of the diode, the negative pole connection load connection of the diode
End；
The ON-OFF control circuit has the first connection end, the second connection end and for input control first connection end and institute
State the switching signal input of the switching signal of on or off between the second connection end；The second voltage input connection
First connection end of the ON-OFF control circuit, the second connection end of the ON-OFF control circuit connects the load connection end.
2. current switch circuit as claimed in claim 1, it is characterised in that the ON-OFF control circuit includes metal-oxide-semiconductor, pull-up
Resistance and triggers circuit；
The drain electrode of the metal-oxide-semiconductor for the ON-OFF control circuit the first connection end, source electrode is the of the ON-OFF control circuit
Two connection ends；
The first end of the pull-up resistor is used to access DC power signal, and the second end of the pull-up resistor connects the MOS
The grid of pipe；
The triggers circuit has trigger input, triggering end and earth terminal；The trigger input is opened for described
The switching signal input of control circuit is closed, the triggering end connects the second end of the pull-up resistor, the earth terminal ground connection.
3. current switch circuit as claimed in claim 2, it is characterised in that the first voltage input is also connected with described
Second end of pull-up resistor.
4. current switch circuit as claimed in claim 2, it is characterised in that the metal-oxide-semiconductor is PMOS.
5. current switch circuit as claimed in claim 2, it is characterised in that the triggers circuit includes first resistor and NPN
Triode；
The first end of the first resistor is the trigger input of the triggers circuit, and the second end of the first resistor connects
Connect the base stage of the NPN triode；The triggering end of the extremely described triggers circuit of the current collection of the NPN triode, transmitting extremely institute
State the earth terminal of triggers circuit.
6. current switch circuit as claimed in claim 5, it is characterised in that the current switch circuit also includes that second is electric
Resistance；
The first end of the second resistance connects the first end of the pull-up resistor, and the second end connection of the second resistance is described
The trigger input of triggers circuit.
7. the current switch circuit as any one of claim 1 to 6, it is characterised in that the current switch circuit is also
Including the first electric capacity and 3rd resistor；
The positive pole of first electric capacity connects the source electrode of the metal-oxide-semiconductor, and the negative pole of first electric capacity connects the grid of the metal-oxide-semiconductor
Pole；Also,
Second end of the pull-up resistor connects the grid of the metal-oxide-semiconductor and is specially：
Second end of the pull-up resistor connects the first end of the 3rd resistor, and the second end connection of the 3rd resistor is described
The grid of metal-oxide-semiconductor.
8. a kind of television power panel, it is characterised in that the television power panel includes power supply mainboard and such as claim 1 to 7 times
Current switch circuit described in one；Load connection end in the current switch circuit is used to connect the standby negative of television board
Carry power end；
The power supply mainboard has standby voltage output end, start voltage output end and switching on and shutting down signal input part；It is described standby
Voltage output end connects the first voltage input of the current switch circuit, and the start voltage output end connects the electric current
The second voltage input of switching circuit, the switching signal that the switching on and shutting down signal input part connects the current switch circuit is defeated
Enter end；The start voltage output end is additionally operable to connect the start load power source end of the television board, the switching on and shutting down signal
Input is additionally operable to connect the switching on and shutting down signal output part of the television board.
9. a kind of TV motherboard, it is characterised in that the TV motherboard includes television board and such as any one of claim 1 to 7
Described current switch circuit；
The television board has standby load power end, start load power source end and switching on and shutting down signal output part；It is described standby
Load power source end connects the load connection end of the current switch circuit, and the start load power source end connects the current switching
The second voltage input of circuit, the switching on and shutting down signal output part connects the switching signal input of the current switch circuit
End；
The first voltage input of the current switch circuit is additionally operable to connect the standby voltage output end of television power panel, described
Second voltage input is additionally operable to connect the start voltage output end of the television power panel, and the switching signal input is also used
In the switching on and shutting down signal input part for connecting the television power panel.
10. a kind of TV, it is characterised in that the TV includes power supply mainboard, television board and as claim 1 to 7 is arbitrary
Current switch circuit described in；
The power supply mainboard has standby voltage output end, start voltage output end and switching on and shutting down signal input part；The TV
Board has standby load power end, start load power source end, switching on and shutting down signal output part；
The standby voltage output end of the power supply mainboard connects the first voltage input of the current switch circuit, the power supply
The start voltage output end of mainboard connects the second voltage input of the current switch circuit and the start of the television board
Load power source end, the switching on and shutting down signal input part of the power supply mainboard connects the switching signal input of the current switch circuit
With the switching on and shutting down signal output part of the television board；The load connection end of the current switch circuit connects the television board
Standby load power end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621196482.3U CN206164702U (en) | 2016-10-28 | 2016-10-28 | Current switching circuit, TV power board, TV mainboard and TV |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621196482.3U CN206164702U (en) | 2016-10-28 | 2016-10-28 | Current switching circuit, TV power board, TV mainboard and TV |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206164702U true CN206164702U (en) | 2017-05-10 |
Family
ID=58657972
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621196482.3U Active CN206164702U (en) | 2016-10-28 | 2016-10-28 | Current switching circuit, TV power board, TV mainboard and TV |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206164702U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110658882A (en) * | 2019-09-30 | 2020-01-07 | 扬州东博电子科技有限公司 | Switch control circuit, control method and central control box applying same |
-
2016
- 2016-10-28 CN CN201621196482.3U patent/CN206164702U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110658882A (en) * | 2019-09-30 | 2020-01-07 | 扬州东博电子科技有限公司 | Switch control circuit, control method and central control box applying same |
| CN110658882B (en) * | 2019-09-30 | 2020-12-29 | 扬州东博电子科技有限公司 | Switch control circuit, control method and central control box applying same |
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