CN106791526A - The HDMI circuit of main equipment and the method powered to slave unit based on HDMI - Google Patents
The HDMI circuit of main equipment and the method powered to slave unit based on HDMI Download PDFInfo
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- CN106791526A CN106791526A CN201610988862.9A CN201610988862A CN106791526A CN 106791526 A CN106791526 A CN 106791526A CN 201610988862 A CN201610988862 A CN 201610988862A CN 106791526 A CN106791526 A CN 106791526A
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000001514 detection method Methods 0.000 claims abstract description 82
- 239000004065 semiconductor Substances 0.000 claims description 17
- 230000005611 electricity Effects 0.000 claims description 15
- 230000005540 biological transmission Effects 0.000 claims description 13
- 230000001960 triggered effect Effects 0.000 claims description 6
- 238000004891 communication Methods 0.000 description 5
- 238000011161 development Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000008054 signal transmission Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
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Classifications
-
- 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
- H04N21/443—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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/765—Interface circuits between an apparatus for recording and another apparatus
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- General Engineering & Computer Science (AREA)
- Software Systems (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
The HDMI circuit and main equipment that the present invention discloses a kind of main equipment are based on the method that HDMI is powered to slave unit, including HDMI；Switch module, the output end of switch module is connected with the HDMI；Power module, is connected through switch module with HDMI；Detection module, for when HDMI accesses slave unit, detecting the resonance signal of slave unit, and exports corresponding detection signal when resonance signal is detected；Control module, for when detection signal is received, controlling switch module to be opened, to control power module to be powered to slave unit by HDMI.The present invention is realized main equipment and is powered to slave unit by HDMI, slave unit is no longer needed that power supply is separately configured, and reduces the volume of slave unit, is allowed to smallerization.
Description
Technical field
The present invention relates to HDMI technical fields, the HDMI circuit of more particularly to a kind of main equipment and based on HDMI
To the method that slave unit is powered.
Background technology
At present, when multimedia audio-visual equipment, communication apparatus etc. carry out data transmission, general USB interface using standard or
HDMI；Wherein, the main equipment such as television set with USB interface for being communicated using standard USB interface can give hard disk, keyboard
Slave unit provides the supply voltage of 5V.
With the development of multimedia related technologies, multimedia audio-visual content develops to the direction of high-resolution, frame per second high, passes
Bandwidth requirement needed for defeated multimedia audio-visual content also more and more higher；And the upper data transmission rate of existing USB interface is low,
The demand of production development cannot have been met, upper data transmission rate HDMI higher has been the substitute is.
Present multimedia audio-visual equipment, the development trend of communication apparatus be to miniaturization, but, due to these equipment
Independent power supply is carried, and power volume is difficult to improve, and thus limit multimedia audio-visual equipment, communication apparatus to miniaturization
Development.
The content of the invention
The main object of the present invention is to propose a kind of HDMI circuit of main equipment and based on HDMI to slave unit
The method of power supply, it is intended to realize that main equipment is powered by HDMI to slave unit, makes slave unit no longer need that electricity is separately configured
Source, reduces the volume of slave unit, is allowed to smallerization.
To achieve the above object, a kind of HDMI circuit of main equipment proposed by the present invention, the HDMI of the main equipment connects
Mouth circuit includes：
HDMI；
Switch module, the output end of the switch module is connected with the HDMI；
Power module, is connected through the switch module with the HDMI；
Detection module, for when the HDMI accesses slave unit, detecting the resonance signal of the slave unit, and
Corresponding detection signal is exported when detecting the resonance signal；
Control module, for when the detection signal is received, controlling the switch module to open, to control the electricity
Source module is powered by the HDMI to the slave unit.
Preferably, the HDMI include HPD signal transmit pin and for other circuits to the main equipment and from
Equipment provides the public power pin of power supply, and the public power pin connects through the switch module with the output end of the power module
Connect；The HPD signal transmission pin is connected with the HPD signal end of the main equipment.
Preferably, the detection module includes：
Square-wave signal output unit, it is multiple pre- for when the HDMI of main equipment has slave unit to access, being sequentially output
If the square-wave signal in cycle is to the HDMI, so that the resonance signal of the slave unit is triggered；
Detection signal trigger element, the resonance signal for receiving the slave unit when the HDMI of the main equipment
When, export the detection signal.
Preferably, the square-wave signal output unit includes first voltage source, first resistor, the first electric capacity and the second electricity
Hold, the cathode output end of the first voltage source is connected with the first end of the first resistor, the negative pole of the first voltage source
Output head grounding；Second end of the first resistor is mutual with the first end of first electric capacity and the first end of second electric capacity
Even；The second end ground connection of first electric capacity；Second end of second electric capacity is connected with the HPD signal end of the main equipment.
Preferably, the detection signal trigger element includes the second voltage source, the first triode, second resistance, the 3rd electricity
Resistance, the 4th resistance, the 3rd electric capacity and the 4th electric capacity, the first end of the 3rd electric capacity is the defeated of the detection signal trigger element
Enter end, the second end of the 3rd electric capacity and the base stage of first triode, the first end of second resistance and the 3rd electricity
The first end interconnection of resistance；The second end ground connection of the second resistance；The extremely described detection signal of current collection of first triode
The output end of trigger element, and first end and the first end and the 4th electric capacity of the 4th electric capacity with the 4th resistance
First end interconnection, the grounded emitter of first triode；Second end of the 3rd resistor and the 4th resistance
The cathode output end interconnection at the second end, the second end of the 4th electric capacity and the second voltage source；The negative pole of the second voltage source
Output head grounding.
Preferably, the switch module includes first switch unit and second switch unit, the first switch unit
Input is connected with the control module, and the output end of the first switch unit connects with the controlled end of the second switch unit
Connect；The input of the second switch unit is connected with the power module, the output end of the second switch unit with it is described
Public power pin is connected.
Preferably, the first switch unit includes the second triode, the 5th resistance, the 6th resistance and the 5th electric capacity, institute
The first end for stating the 5th resistance is the input of the first switch unit, the second end of the 5th resistance and the described 6th electricity
The base stage interconnection of the first end of resistance, the first end of the 5th electric capacity and second triode；Second end of five electric capacity and institute
The second end connection of the 5th resistance is stated, and is grounded；The colelctor electrode of second triode is controlled with the second switch unit
End connection；The grounded emitter of second triode.
Preferably, the second switch unit includes the 7th resistance, the 8th resistance, the 6th electric capacity and metal-oxide-semiconductor, the described 7th
The first end of resistance is the controlled end of the second switch unit, and is connected with the first end of the 8th resistance, the described 7th
Second end of resistance is connected with the first end of the grid of the metal-oxide-semiconductor and the 6th electric capacity；Second end of the 8th resistance
Be the input of the second switch unit, and the second end with the 6th electric capacity and the metal-oxide-semiconductor source electrode interconnection；It is described
The drain electrode of metal-oxide-semiconductor is the output end of the second switch unit.
The present invention also proposes that a kind of main equipment is based on the method that HDMI is powered to slave unit, and the main equipment is based on
The step of method that HDMI is powered to slave unit, includes：
When the HDMI of main equipment has slave unit to access, the resonance signal of the slave unit is detected, and detected
Corresponding detection signal is exported during the resonance signal；
When the detection signal is received, out-put supply to the HDMI is powered with to the slave unit.
Preferably, when the HDMI in main equipment has slave unit to access, the resonance signal of the slave unit is detected,
And include the step of corresponding detection signal is exported when the resonance signal is detected：
When the HDMI of main equipment has slave unit to access, the square-wave signal of multiple predetermined periods is sequentially output to described
HDMI, so that the resonance signal of the slave unit is triggered；
When the HDMI of the main equipment receives the resonance signal of the slave unit, the detection signal is exported.
The HDMI circuit of main equipment of the present invention controls detection module to detect through HDMI by control module
The slave unit of connection, when the resonance signal of the slave unit output is detected, exports corresponding detection signal to control module,
Control module controlling switch module after the detection signal is received is opened, to control power module through HDMI to access
Slave unit is powered.So, using the HDMI circuit of main equipment of the present invention, just can be not provided with independent power supply
When slave unit carries out data transmission, powered to the slave unit for being not provided with independent power supply, to realize that main equipment is connect by HDMI
Mouth is powered to slave unit, slave unit is no longer needed that power supply is separately configured, and reduces the volume of slave unit, is allowed to smallerization.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Structure according to these accompanying drawings obtains other accompanying drawings.
Fig. 1 is the high-level schematic functional block diagram of the HDMI circuit preferred embodiment of main equipment of the present invention；
Fig. 2 is the electrical block diagram of detection module in the HDMI circuit of main equipment shown in Fig. 1；
Fig. 3 is the electrical block diagram of the HDMI circuit breaker in middle module of main equipment shown in Fig. 1；
Fig. 4 is the flow signal that main equipment of the present invention is based on the method preferred embodiment that HDMI is powered to slave unit
Figure；
Fig. 5 is the refinement flow of step 10 in the method that the main equipment shown in Fig. 4 is powered based on HDMI to slave unit
Schematic diagram.
Drawing reference numeral explanation：
The realization of the object of the invention, functional characteristics and advantage will be described further referring to the drawings in conjunction with the embodiments.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Base
Embodiment in the present invention, those of ordinary skill in the art obtained under the premise of creative work is not made it is all its
His embodiment, belongs to the scope of protection of the invention.
If it is to be appreciated that related in the embodiment of the present invention directionality indicate (such as up, down, left, right, before and after ...),
Then directionality indicate to be only used for explain relative position relation between each part under a certain particular pose (as shown in drawings),
Motion conditions etc., if the particular pose changes, directionality indicates also correspondingly to change therewith.
If in addition, relating to the description of " first ", " second " etc. in the embodiment of the present invention, being somebody's turn to do " first ", " second " etc.
Description be only used for describing purpose, and it is not intended that indicating or implying its relative importance or implicit indicate indicated skill
The quantity of art feature.Thus, " first " is defined, at least one spy can be expressed or be implicitly included to the feature of " second "
Levy.In addition, the technical scheme between each embodiment can be combined with each other, but must be with those of ordinary skill in the art's energy
Based on enough realizations, when the combination appearance of technical scheme is conflicting or cannot realize it will be understood that the knot of this technical scheme
Conjunction does not exist, not within the protection domain of application claims yet.
The present invention proposes a kind of HDMI circuit of main equipment.
Reference picture 1, in an embodiment of the present invention, the HDMI circuit of the main equipment includes HDMI 10, detection
Module 20, control module 30, power module 40 and switch module 50.
In the present embodiment, power module 40 is connected through switch module 50 with the HDMI 10；Detection module 20 is used for
When the HDMI 10 accesses slave unit, the resonance signal of the slave unit is detected, and detecting the resonance signal
When export corresponding detection signal；Control module 30 is used to, when the detection signal is received, control the switch module 50
Open, to control the power module 40 to be powered to the slave unit.
It should be noted that slave unit is divided into and is provided with independent power supply and is not provided with two kinds of independent power supply, when from
Independent power supply is provided with equipment, when carrying out data transmission with main equipment, can be set by based on HDMI 10
Standby HPD signal interlock circuit provides the power supply such as pull-up power supply and the EDID memory modules for main equipment.When in slave unit not
Set independent power supply, when carrying out data transmission with main equipment, it is necessary to main equipment supply power for could normal work, and
It is not provided with being provided with resonance circuit in the slave unit of independent power supply, therefore, when the HDMI 10 of main equipment is accessed
When having slave unit, main equipment can judge to be not provided with the slave unit for accessing by detecting the resonance signal of slave unit output
Independent current source, and when slave unit is not provided with independent current source for slave unit is powered.
Specifically, when the HDMI 10 is accessed slave unit, the control detection module 20 of control module 30 is detected
During the resonance signal of the slave unit output, corresponding detection signal is exported to control module 30, control module 30 is being received
Controlling switch module 50 is opened after the detection signal, to control power module 40 to be supplied to the slave unit for accessing through HDMI 10
Electricity.When the resonance signal of the slave unit output is not detected by, corresponding detection signal to control module 30 is exported, control mould
The controlling switch module 50 after the detection signal is received of block 30 is closed, to control power module 40 through HDMI 10 not to connecing
The slave unit for entering is powered.For example, main equipment is television set, during slave unit is for the application of DVD, when television set and DVD pass through HDMI
When interface is connected, when television set detects the resonance signal of the slave unit output, judge that the DVD is not provided with independent current source,
And powered to DVD by HDMI, so that DVD works.So DVD just can read the E-EDID data of television set, complete
After communication between DVD and television set, audio-video signal is transferred to by television set by HDMI.
The HDMI circuit of main equipment of the present invention controls detection module 20 to detect through HDMI by control module 30
The slave unit of the connection of interface 10, when the resonance signal of the slave unit output is detected, exports corresponding detection signal to control
Molding block 30, the controlling switch module 50 after the detection signal is received of control module 30 is opened, to control power module 40 to pass through
HDMI 10 is powered to the slave unit for accessing.So, using the HDMI circuit of main equipment of the present invention, just can with do not set
When the slave unit for putting independent power supply carries out data transmission, powered to the slave unit for being not provided with independent power supply, so that
Realize main equipment to be powered to slave unit by HDMI, slave unit is no longer needed that power supply is separately configured, thus reduce from
The volume of equipment, is allowed to smallerization.
Reference picture 2, in a preferred embodiment, the HDMI 10 includes that HPD signal transmits pin HPD and for institute
Other circuits and slave unit for stating main equipment provide the public power pin of power supply, and the public power pin is through the switch module 50
It is connected with the output end OUT of the power module 40；The HPD signal transmission pin HPD connects with the HPD signal end of the main equipment
Connect.
Specifically, when the HDMI 10 of main equipment is connected with slave unit, if detection module 20 detect it is described from setting
During the resonance signal of standby output, corresponding detection signal to control module 30 is exported, control module 30 is receiving detection letter
Controlling switch module 50 is opened after number, to control power module 40 to be powered to the slave unit for accessing through the public pin VCC of power supply, together
When, power module 40 is also electric to provide pull-up by the public pin VCC out-put supplies of power supply to the HPD signal interlock circuit of main equipment
Source, and/or out-put supply to the EDID memory modules of main equipment are powered with to EDID memory modules.
Additionally, after main equipment provides electricity to slave unit, if main equipment has been already prepared to E-EDID data and E-EDID
Data are in readable state, and the control module 30 of main equipment will draw the HPD signal of HPD signal transmission pin HPD from low level
Be high level so that slave unit is detecting after HPD signal level is changed into high level from low level, by HDMI 10 its
His pin reads the E-EDID data of main equipment, and to realize the communication between slave unit and main equipment, such main equipment just can be received
The audio-video signal of slave unit output.
In the present embodiment, the HPD interfaces 10 of main equipment are realized when slave unit is to set independent current source, and main equipment passes through
HDMI 10 is powered to slave unit, slave unit is no longer needed that power supply is separately configured, and reduces the volume of slave unit, is allowed to smaller
Type.
Reference picture 2, in a preferred embodiment, the detection module 20 includes：
Square-wave signal output unit 21, for when the HDMI 10 of main equipment has slave unit to access, being sequentially output many
The square-wave signal of individual predetermined period to the HDMI 10, so that the resonance signal of the slave unit is triggered；
Detection signal trigger element 22, the resonance for receiving the slave unit when the HDMI 10 of the main equipment
During signal, the detection signal is exported.
It should be noted that be not provided with being provided with resonance circuit in the slave unit of independent power supply, and each resonance
Circuit is respectively provided with a particular resonant frequency in itself, and the frequency is determined by circuit element parameter, usually the parameter of L, C.When outer
When the frequency of the signal of portion's input is equal with circuit resonant frequencies or close, the overall impedance of circuit performance is smaller, so, works as warp
When the square-wave signal frequency of the input of square-wave signal output unit 21 is equal to resonant frequency, circuit impedance is minimum, and resonance circuit should
Resonant frequency is exported to detection signal trigger element 22, so as to judge that the slave unit is the equipment for being not provided with independent power supply.
In the present embodiment, when the HDMI 10 of main equipment has slave unit to access, square-wave signal output unit 21 will
The square-wave signal of different cycles is exported to detect the resonant frequency of slave unit, detection signal trigger element 22 is detecting slave unit
Detection signal is exported to control module 30 after the resonant frequency of output, additionally, square-wave signal output unit 21 will continue the cycle
Property ground output different cycles square-wave signal being not provided with the slave unit of independent current source and be provided with the slave unit of independent current source
Between when switching over, control detection signal trigger element 22 exports detection signal to control module 30, so that control mould
Block 30 exports corresponding control signal, is closed with controlling switch module 50, so as to control power module 40 to be connect by the HDMI
Mouth 10 stops being powered to the slave unit.
Reference picture 2, further, the square-wave signal output unit 21 includes first voltage source V1, first resistor R1, the
One electric capacity C1 and the second electric capacity C2, the cathode output end of the first voltage source V1 connects with the first end of the first resistor R1
Connect, the cathode output end ground connection of the first voltage source V1；Second end of the first resistor R1 is with the first electric capacity C1's
The first end interconnection of first end and the second electric capacity C2；The second end ground connection of the first electric capacity C1；The second electric capacity C2
The second end be connected with the HPD signal end of the main equipment.
In the present embodiment, first voltage source V1 is controlled based on control module 30, the square-wave signal for exporting different cycles,
The RC integrating circuit being made up of first resistor R1, the first electric capacity C1, saw is converted into by the square-wave signal that first voltage source V1 is exported
Exported after tooth ripple, to protrude direct current and the slowly varying component of square-wave signal, while the variable quantity of square-wave signal is reduced, so that from
Resonance circuit in equipment preferably receives the signal exported through first voltage source V1, to reduce the False Rate of detection.
Reference picture 2, further, the detection signal trigger element 22 include the second voltage source V2, the first triode Q1,
Second resistance R2,3rd resistor R3, the 4th resistance R4, the 3rd electric capacity C3 and the 4th electric capacity C4, the first of the 3rd electric capacity C3
It is the input of the detection signal trigger element 22 to hold, and second end of the 3rd electric capacity C3 is with the first triode Q1's
The first end interconnection of base stage, the first end of second resistance R2 and the 3rd resistor R3；Second termination of the second resistance R2
Ground；The output end of the extremely described detection signal trigger element 22 of current collection of the first triode Q1, and with the 4th resistance
The first end interconnection of the first end and the 4th electric capacity C4 of the first end of R4 and the 4th electric capacity C4, first triode
The grounded emitter of Q1；Second end of second end of the 3rd resistor R3 and the 4th resistance R4, the of the 4th electric capacity C4
The cathode output end interconnection of two ends and the second voltage source V2；The cathode output end ground connection of the second voltage source V2.
In the present embodiment, when resonance circuit receives the square-wave signal exported through square wave signal output unit 21, and produce
During resonance, the resonance signal is exported to the base stage of the first triode Q1 after being coupled through the 3rd electric capacity C3, while second voltage
After the voltage signal of source V2 outputs carries out partial pressure through second resistance R2 and 3rd resistor R3, the base of output to the first triode Q1
Pole, so that during the positive of resonance signal, after resonance signal is overlapped with the voltage signal of the second voltage source V2 outputs
So that the first triode Q1 is turned on, after the first triode Q1 conductings, the level of the colelctor electrode of the first triode Q1 is pulled low and defeated
Go out a low level signal to control module 30.
Further, the detection module also includes tertiary voltage source V3 and the 9th resistance R9, and the 3rd power supply is based on master and sets
Standby control module 30 is controlled, for when main equipment and slave unit carry out data transmission, being exported through HPD signal transmission pin HPD
Corresponding low level or high level HPD signal.
In a preferred embodiment, the control module 30 can realize that MCU control chips have using MCU control chips
Signal control pin, detection signal receive pin D and switch control pin O/F, wherein, signal control pin is used to export square-wave signal control
Pin to square-wave signal output unit 21 input；Detection signal receives pin D to be used to receive the defeated of detection signal trigger element 22
Go out the detection signal of end output；Switch control pin O/F is acted for output control signal with controlling switch module 50.
Reference picture 3, in a preferred embodiment, the switch module 50 includes first switch unit 51 and second switch list
Unit 52, the input of the first switch unit 51 is connected with the control module 30, the output of the first switch unit 51
End is connected with the controlled end of the second switch unit 52；The input of the second switch unit 52 and the power module 40
Connection, the output end of the second switch unit 52 is connected with the public power pin VCC.
In the present embodiment, rung with improving switch by setting first switch unit 51 and the secondary switch of second switch unit 52
Answer speed.
Reference picture 3, further, the first switch unit 51 includes the second triode Q2, the 5th resistance R5, the 6th electricity
Resistance R6 and the 5th electric capacity C5, the first end of the 5th resistance R5 is the input of the first switch unit 51, the described 5th
The first end of second end of resistance R5 and the 6th resistance R6, the first end of the 5th electric capacity C5 and the second triode Q2's
Base stage is interconnected；Second end of five electric capacity is connected with second end of the 5th resistance R5, and is grounded；Second triode
The colelctor electrode of Q2 is connected with the controlled end of the second switch unit 52；The grounded emitter of the second triode Q2.
In the present embodiment, when the base stage of the second triode Q2 receives the control signal of the output of control module 30, first
Triode Q1 conduction and cut-offs, so as to trigger second switch unit 52 act.
Reference picture 3, further, the second switch unit 52 includes the 7th resistance R7, the 8th resistance R8, the 6th electric capacity
The first end of C6 and metal-oxide-semiconductor QW1, the 7th resistance R7 is the controlled end of the second switch unit 52, and with the described 8th
The first end connection of resistance R8, second end of the 7th resistance R7 and the grid of the metal-oxide-semiconductor QW1 and the 6th electric capacity C6
First end connection；Second end of the 8th resistance R8 is the input of the second switch unit 52, and with the described 6th
The source electrode interconnection of second end of electric capacity C6 and the metal-oxide-semiconductor QW1；The drain electrode of the metal-oxide-semiconductor QW1 is the second switch unit 52
Output end.
In the present embodiment, when the grid of metal-oxide-semiconductor QW1 receives the triggering of the output of first switch unit 51 through the 7th resistance R7
During signal, metal-oxide-semiconductor QW1 conductings so that power module 40 through metal-oxide-semiconductor QW1 by the HDMI 10 to described in from setting
Available electricity.
In order to thought of the invention is better described, the concrete principle of circuit of the present invention is carried out below in conjunction with Fig. 2 and Fig. 3
Illustrate：
Such as accompanying drawing 2 and accompanying drawing 3, when the HDMI 10 of main equipment is connected with slave unit, MCU control chips are through signal control
The square-wave signal in cycles of the pin output square-wave signal control signal processed to control first voltage source V1 outputs different, the square-wave signal
Through HDMI 10 after square-wave signal is converted into sawtooth signal through first resistor R1 and the first electric capacity C1 composition integrating circuit
HPD transmission pin HPD export to the HPD signal end of slave unit, if the HPD signal end for detecting slave unit be provided with resonance electricity
Road, and the resonance circuit receives sawtooth signal, and when producing resonance, the resonance signal is coupled to first through the 3rd electric capacity C3
The base stage of triode Q1, while the voltage signal of the second voltage source V2 outputs carries out partial pressure through second resistance R2 and 3rd resistor R3
Afterwards, output to the first triode Q1 base stage, so, during the positive of resonance signal, resonance signal and the second voltage source V2
So that the first triode Q1 is turned on after the voltage signal of output is overlapped, after the first triode Q1 conductings, the first triode
The level of the colelctor electrode of Q1 is pulled low and exports a low level signal to the detection signal of MCU control chips and receive pin D, MCU controls
Coremaking piece exports the base stage of open signal to the second triode Q2 through switch control pin O/F after the detection signal is received, with
The first triode Q1 is turned on, and then triggers metal-oxide-semiconductor QW1 conductings, to control power module 40 public through the power supply of HDMI 10
Pin VCC powers to the slave unit for accessing altogether, meanwhile, power module 40 is also by the public pin VCC out-put supplies of power supply to main equipment
HPD signal interlock circuit providing pull-up power supply, and/or out-put supply to the EDID memory modules of main equipment think power supply
EDID memory modules.
If the HPD signal end for detecting slave unit is not provided with resonance circuit, why can be determined that the slave unit has itself
Independent power supply, now MCU control chips are through switching the base for controlling pin O/F to export shutdown signal to the second triode Q2
Pole, so that the first triode Q1 ends, and then triggers metal-oxide-semiconductor QW1 cut-offs, to control power module 40 through the electricity of HDMI 10
The public pin VCC in source stops being powered to the slave unit for accessing.Now, the power supply mechanism of slave unit will be defeated by the public pin VCC of power supply
Go out power supply to the HPD signal interlock circuit of main equipment to provide pull-up power supply, and/or out-put supply is stored to the EDID of main equipment
Module thinks power supply EDID memory modules.
It is understood that when the HDMI 10 of main equipment is connected with slave unit, first voltage source V1 contribute output
Different square-wave signal of continuous and cycle, so as to whether judge the slave unit by the way that whether the slave unit is provided with resonance circuit
Independent power supply is provided with, and is powered to slave unit when power supply is not provided with.Meanwhile, it is continuous and all also by output
Phase different square-wave signal come detect be not provided with independent power supply from being provided between the slave unit of independent power supply
When switching over, control power module 40 stops being powered to slave unit in time.
Reference picture 4, the HDMI circuit based on above-mentioned main equipment, the present invention also proposes that a kind of main equipment is connect based on HDMI
The method that mouth is powered to slave unit, the control method is comprised the following steps：
S10, when the HDMI of main equipment has slave unit to access, detect the resonance signal of the slave unit, and in inspection
Corresponding detection signal is exported when measuring the resonance signal；
In the present embodiment, slave unit is divided into and is provided with independent power supply and is not provided with two kinds of independent power supply, when
Independent power supply is provided with slave unit, when carrying out data transmission with main equipment, can be set by based on HDMI
Standby HPD signal interlock circuit provides the power supply such as pull-up power supply and the EDID memory modules for main equipment.When in slave unit not
Independent power supply is set, when carrying out data transmission with main equipment, it is necessary to main equipment supplies power for ability normal work, and
It is being not provided with being each equipped with resonance circuit in the slave unit of independent power supply.So, when the HDMI of main equipment connects
When entering to have slave unit, main equipment can determine to access by detecting resonance signal that resonance circuit in slave unit exports from setting
It is standby to be above not provided with independent current source, and powered to slave unit when slave unit is not provided with independent current source, and do not detecting slave unit
The resonance signal of upper output comes, it is determined that being provided with independent current source in the slave unit for accessing, then need not be powered to the slave unit.
When the HDMI of main equipment has monitored that slave unit is accessed, the presence or absence of resonance signal in detection slave unit from
And judge whether resonance circuit is provided with slave unit, if detecting the resonance signal, judge that the slave unit is provided with resonance
Circuit, the i.e. slave unit are not provided with independent power supply, and export corresponding detection signal, and the detection signal is resonance
Resonance signal of circuit output.If being not detected by the resonance signal, judge that the slave unit is not provided with resonance circuit, i.e., should
Slave unit is provided with independent power supply, exports corresponding detection signal.
S20, when the detection signal is received, out-put supply to the HDMI 10, with give the slave unit supply
Electricity.
When the detection signal for detecting resonance signal is received, just can determine that the slave unit is not provided with independent power supply
Power supply, main equipment is exported to the slave unit power supply through HDMI 10, is powered with to the slave unit, realizes data transfer.
When the detection signal for being not detected by resonance signal is received, just can determine that the slave unit sets independent power supply
Power supply, main equipment is without exporting to the slave unit power supply through HDMI.
Main equipment of the present invention is based on the HDMI and slave unit of method that HDMI powers to slave unit in main equipment
During connection, slave unit is detected, and when the resonance signal of the slave unit output is detected, the corresponding detection letter of output
Number, powered to the slave unit for accessing with through HDMI.So, just can enter with the slave unit for being not provided with independent power supply
During row data transfer, the slave unit for being not provided with independent power supply is powered, to realize main equipment by HDMI to slave unit
Power supply, makes slave unit no longer need that power supply is separately configured, so as to reduce the volume of slave unit, is allowed to smallerization.
Reference picture 5, further, when the HDMI in main equipment has slave unit to access, detects the slave unit
Resonance signal, and S10 includes the step of corresponding detection signal is exported when the resonance signal is detected：
S11, when the HDMI of main equipment has slave unit to access, be sequentially output the square-wave signal of multiple predetermined periods extremely
The HDMI, so that the resonance signal of the slave unit is triggered；
It should be noted that be not provided with being provided with resonance circuit in the slave unit of independent power supply, and each resonance
Circuit is respectively provided with a particular resonant frequency in itself, and the frequency is determined by circuit element parameter, usually the parameter of L, C.When outer
When the frequency of the signal of portion's input is equal with circuit resonant frequencies or close, the overall impedance of circuit performance is smaller, so, the side of working as
When ripple signal frequency is equal to resonant frequency, circuit impedance is minimum, that is, trigger the resonance signal of slave unit.
Different square-wave signal of multiple cycles is previously provided with main equipment, when the HDMI for monitoring main equipment have from
When equipment is accessed, the square-wave signal of different cycles is just exported to the HPD signal end of HDMI, slave unit is provided with resonance electricity
Lu Shi, resonance signal is produced to trigger the resonance circuit in slave unit.
Additionally, when the HDMI for monitoring main equipment has slave unit to access, multiple weeks are previously provided with main equipment
Phase different square-wave signal will be exported periodically, be not provided with the slave unit of independent current source be provided with independent current source from
Can be monitored in time when being switched between equipment, while the accuracy of detection signal can also be improved.
S12, when the HDMI of the main equipment receives the resonance signal of the slave unit, export it is described detection letter
Number.
When the generation resonance signal of the resonance circuit in slave unit is detected, it is determined that the HDMI 10 of main equipment is accessed
Slave unit be not provided with independent power supply, then export corresponding detection signal.
To sum up, main equipment of the present invention be based on method that HDMI powers to slave unit main equipment HDMI with from
When equipment is connected, the square-wave signal of multiple predetermined periods is sequentially output to the HDMI so that the resonance of the slave unit is believed
Number triggering, and when the resonance signal of slave unit output is detected, corresponding detection signal is exported, and then through HDMI
Powered to the slave unit for accessing.So, just can be when carrying out data transmission with the slave unit for being not provided with independent power supply, not
The slave unit for setting independent power supply is powered, and to realize that main equipment is powered by HDMI to slave unit, makes slave unit not
Need that power supply is separately configured again, so as to reduce the volume of slave unit, be allowed to smallerization.
The preferred embodiments of the present invention are the foregoing is only, the scope of the claims of the invention is not thereby limited, it is every at this
Under the inventive concept of invention, the equivalent structure transformation made using description of the invention and accompanying drawing content, or directly/use indirectly
It is included in scope of patent protection of the invention in other related technical fields.
Claims (10)
1. the HDMI circuit of a kind of main equipment, it is characterised in that including：
HDMI；
Switch module, the output end of the switch module is connected with the HDMI；
Power module, is connected through the switch module with the HDMI；
Detection module, for when the HDMI accesses slave unit, detecting the resonance signal of the slave unit, and in detection
Corresponding detection signal is exported during to the resonance signal；
Control module, for when the detection signal is received, controlling the switch module to open, to control the power supply mould
Block is powered by the HDMI to the slave unit.
2. the HDMI circuit of main equipment as claimed in claim 1, it is characterised in that the HDMI includes HPD letters
Number transmission pin and for the main equipment other circuits and slave unit provide power supply public power pin, the public power
Pin is connected through the switch module with the output end of the power module；The HPD signal transmits the HPD of pin and the main equipment
Signal end is connected.
3. the HDMI circuit of main equipment as claimed in claim 1 or 2, it is characterised in that the detection module includes：
Square-wave signal output unit, for when the HDMI of main equipment has slave unit to access, being sequentially output multiple default weeks
The square-wave signal of phase to the HDMI, so that the resonance signal of the slave unit is triggered；
Detection signal trigger element, during for the resonance signal that the slave unit is received when the HDMI of the main equipment,
Export the detection signal.
4. the HDMI circuit of main equipment as claimed in claim 3, it is characterised in that the square-wave signal output unit bag
Include first voltage source, first resistor, the first electric capacity and the second electric capacity, the cathode output end of the first voltage source and described first
The first end connection of resistance, the cathode output end ground connection of the first voltage source；Second end of the first resistor and described
The first end interconnection of the first end of one electric capacity and second electric capacity；The second end ground connection of first electric capacity；Second electricity
The second end for holding is connected with the HPD signal end of the main equipment.
5. the HDMI circuit of main equipment as claimed in claim 3, it is characterised in that the detection signal trigger element bag
Include the second voltage source, the first triode, second resistance, 3rd resistor, the 4th resistance, the 3rd electric capacity and the 4th electric capacity, described
The first end of three electric capacity is the input of the detection signal trigger element, second end and the described 1st of the 3rd electric capacity
The first end interconnection of the base stage of pole pipe, the first end of second resistance and the 3rd resistor；Second termination of the second resistance
Ground；The output end of the extremely described detection signal trigger element of the current collection of first triode, and with the of the 4th resistance
The first end interconnection of the first end and the 4th electric capacity of one end and the 4th electric capacity, the emitter stage of first triode connects
Ground；Second end of the second end of the 3rd resistor and the 4th resistance, the second end of the 4th electric capacity and the second voltage
The cathode output end interconnection in source；The cathode output end ground connection of the second voltage source.
6. the HDMI circuit of main equipment as claimed in claim 2, it is characterised in that the switch module is opened including first
Unit and second switch unit are closed, the input of the first switch unit is connected with the control module, the first switch
The output end of unit is connected with the controlled end of the second switch unit；The input of the second switch unit and the power supply
Module is connected, and the output end of the second switch unit is connected with the public power pin.
7. the HDMI circuit of main equipment as claimed in claim 6, it is characterised in that the first switch unit includes the
Two triodes, the 5th resistance, the 6th resistance and the 5th electric capacity, the first end of the 5th resistance is the first switch unit
Input, the second end of the 5th resistance and first end, the first end of the 5th electric capacity and described second of the 6th resistance
The base stage interconnection of triode；Second end of five electric capacity is connected with the second end of the 5th resistance, and is grounded；Described second
The colelctor electrode of triode is connected with the controlled end of the second switch unit；The grounded emitter of second triode.
8. the HDMI circuit of main equipment as claimed in claim 6, it is characterised in that the second switch unit includes the
Seven resistance, the 8th resistance, the 6th electric capacity and metal-oxide-semiconductor, the first end of the 7th resistance is the controlled of the second switch unit
End, and is connected with the first end of the 8th resistance, the second end of the 7th resistance and the grid of the metal-oxide-semiconductor and described the
The first end connection of six electric capacity；Second end of the 8th resistance is the input of the second switch unit, and with described
The source electrode interconnection at second end and the metal-oxide-semiconductor of six electric capacity；The drain electrode of the metal-oxide-semiconductor is the output of the second switch unit
End.
9. a kind of main equipment is based on the method that HDMI is powered to slave unit, it is characterised in that the main equipment is based on HDMI
The step of method that interface is powered to slave unit, includes：
When the HDMI of main equipment has slave unit to access, the resonance signal of the slave unit is detected, and it is described detecting
Corresponding detection signal is exported during resonance signal；
When the detection signal is received, out-put supply to the HDMI is powered with to the slave unit.
10. main equipment as claimed in claim 9 is based on the method that HDMI is powered to slave unit, it is characterised in that described
When the HDMI of main equipment has slave unit to access, the resonance signal of the slave unit is detected, and detecting the resonance
The step of corresponding detection signal is exported during signal includes：
When the HDMI of main equipment has slave unit to access, the square-wave signal of multiple predetermined periods to the HDMI is sequentially output
Interface, so that the resonance signal of the slave unit is triggered；
When the HDMI of the main equipment receives the resonance signal of the slave unit, the detection signal is exported.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610988862.9A CN106791526A (en) | 2016-11-09 | 2016-11-09 | The HDMI circuit of main equipment and the method powered to slave unit based on HDMI |
| PCT/CN2016/112830 WO2018086221A1 (en) | 2016-11-09 | 2016-12-29 | Hdmi interface circuit for master device and method for supplying power to slave device on basis of hdmi interface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610988862.9A CN106791526A (en) | 2016-11-09 | 2016-11-09 | The HDMI circuit of main equipment and the method powered to slave unit based on HDMI |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106791526A true CN106791526A (en) | 2017-05-31 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610988862.9A Pending CN106791526A (en) | 2016-11-09 | 2016-11-09 | The HDMI circuit of main equipment and the method powered to slave unit based on HDMI |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN106791526A (en) |
| WO (1) | WO2018086221A1 (en) |
Cited By (2)
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| CN106792017A (en) * | 2016-12-09 | 2017-05-31 | 深圳Tcl数字技术有限公司 | Peripheral hardware identifying system, method and electronic equipment |
| CN114624633A (en) * | 2022-05-17 | 2022-06-14 | 陕西天视致远航空技术有限公司 | HDMI (high-definition multimedia interface) port plugging detection system and method, electronic equipment and storage medium |
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| CN111813364B (en) * | 2020-07-20 | 2023-11-03 | 深圳宝新创科技股份有限公司 | Display card signal transmission circuit and main board |
| CN113010461A (en) * | 2021-03-02 | 2021-06-22 | 厦门亿联网络技术股份有限公司 | Power supply switching device for power supply control and HDMI conversion and control method thereof |
| CN114020675B (en) * | 2021-10-29 | 2024-12-03 | 北京小米移动软件有限公司 | Power supply method, device, electronic device and storage medium |
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| WO2018086221A1 (en) | 2018-05-17 |
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