CN108287289A - Detection circuit and its detection method altogether - Google Patents
Detection circuit and its detection method altogether Download PDFInfo
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- CN108287289A CN108287289A CN201710016821.8A CN201710016821A CN108287289A CN 108287289 A CN108287289 A CN 108287289A CN 201710016821 A CN201710016821 A CN 201710016821A CN 108287289 A CN108287289 A CN 108287289A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
- G01R31/67—Testing the correctness of wire connections in electric apparatus or circuits
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
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Abstract
The embodiment of the invention discloses a kind of detection circuit and its detection methods altogether, belong to electronic technology field.Detection circuit includes altogether for this：Control process unit, switching circuit, voltage detecting circuit and interface connector, and the control process unit includes interfacing circuitry, the interfacing circuitry connect with interface connector and for being docked with external cable interface by interface connector, the control process unit is connect with the control terminal of the switching circuit, closure for controlling the switching circuit and shutdown, first signal end of the switching circuit and the ground terminal of the voltage detecting circuit are connect with reference ground respectively, the second signal end of the switching circuit and the test side of the voltage detecting circuit are connect with the earth signal output end of interface connector respectively.Altogether whether the embodiment of the present invention can detect with opposite equip. automatically, be manually operated without user, improve detection efficiency.
Description
Technical field
The present embodiments relate to electronic technology field, more particularly to a kind of detection circuit and its detection method altogether.
Background technology
Currently, between each equipment can pass through various cable interfaces realize connection, wherein various cable interfaces include but
It is not limited to digital visual interface (Digital Visual Interface, DVI), high-definition multimedia interface (High
Definition Multimedia Interface, HDMI), Video Graphics Array (Video Graphics Array, VGA)
Interface and Composite Video Baseband Signal (Composite Video Broadcast Signal, CVBS) interface etc..Actually answering
With in scene, when realized by cable interface between two equipment connect when, if two equipment not altogether, are easy tod produce and are regarded
The problems such as frequency water ripples, tone currents sound.Therefore, it during two equipment are realized by cable interface and connected, needs to examine
Whether altogether to survey two equipment.
At present, it usually needs altogether whether two equipment of the dynamic detection of user hand, that is, user passes through such as ohmmeter or the like
Detector test the impedance between the ground wire of two equipment, and be to judge two equipment according to the size for the impedance tested
It is no altogether.If the impedance tested is smaller, can determine two equipment altogether, whereas if the impedance tested compared with
Greatly, then it can determine two equipment not altogether.
However, when equipment is more, user is needed to be tested one by one by detector, leads to operate relatively complicated, inspection
It surveys less efficient.
Invention content
In order to solve the problems, such as that detection efficiency is relatively low in the prior art, an embodiment of the present invention provides one kind detecting electricity altogether
Road and its detection method.The technical solution is as follows：
In a first aspect, providing one kind, detection circuit, the detection circuit altogether include altogether：
Control process unit, switching circuit, voltage detecting circuit and interface connector, and the control process unit includes
Interfacing circuitry, the interfacing circuitry connect with the interface connector and for by the interface connectors and outside
The cable interface in portion docks；
The control process unit is connect with the control terminal of the switching circuit, the closure for controlling the switching circuit
With shutdown, the first signal end of the switching circuit and the ground terminal of the voltage detecting circuit are connect with reference ground respectively, institute
The test side at the second signal end and the voltage detecting circuit of the stating switching circuit earth signal with the interface connector respectively
Output end connects, and the earth signal output end is used to pass through the interface connector and the cable when the interfacing circuitry
Interface exports the earth signal that the cable interface is transmitted when docking.
In embodiments of the present invention, during being connect with opposite equip. by cable interface, and if opposite equip.
Not altogether, then when opposite equip. sends audio, video data or other signals to local device, or when local device is to opposite end
Equipment sends audio, video data or when other signals, the problems such as easy ting produce video water ripples, tone currents sound.For this purpose,
During connecting with opposite equip., need whether altogether to detect local device and opposite equip. by total ground detection circuit.
Wherein, above-mentioned other signals can be minimize differential signal transmission (Transition Minimized Differential,
TMDS) etc..
Specifically, when switching circuit is off, voltage detecting circuit detects the earth signal of the interface connector
Output end.When the voltage value that the voltage detecting circuit detects meets preset condition, it may be determined that local device is set with opposite end
For altogether.When the voltage value that the voltage detecting circuit detects does not meet the preset condition, it may be determined that local device with it is right
End equipment is not altogether.In this way, whether altogether to realize between automatic detection local device and opposite equip., detection effect is improved
Rate.
Optionally, if the interface connector includes metal shell and exported the metal shell as the earth signal
End, then the second signal end of the switching circuit and the test side of the voltage detecting circuit connect with the metal shell respectively
It connects；
If the interface connector includes the metal shell and designated pin and by the metal shell and described specified
Pin is used as the earth signal output end, then the second signal end of the switching circuit and the metal shell and described specified
Pin is separately connected, and the test side of the voltage detecting circuit is separately connected with the metal shell and the designated pin, institute
Designated pin is stated for exporting the earth signal that earth signal line corresponding with the designated pin is transmitted in the cable interface.
In practical applications, different with the model of corresponding interface connector according to cable interface, the cable of different model
The construction of interface and corresponding interface connector may differ widely.When the construction of cable interface and corresponding interface connector not
When identical, the second signal end of said switching circuit and the connection with earth signal output end respectively of the test side of voltage detecting circuit
Mode may be also different, can specifically include several possible realization methods as above, improve the applicability of total ground detection circuit.
Optionally, the switching circuit includes relay, and the control process unit connects with the coil in the relay
It connects, the normally opened contact in the relay is connect with the reference ground, the normally-closed contact in the relay and the earth signal
Output end connects.
In practical application scene, in practical application scene, which can be with by whether for the relay
The coil power supply of device controls closure or the disconnection of the switching circuit.For example, when the control process unit is the coil power supply,
It is attracted normally opened contact and normally-closed contact so that the relay is in closed state.Stop being the relay when control process unit
Coil power supply when, the normally opened contact and normally-closed contact disconnect, so that the relay is off.In this way, passing through
The relay realizes the switching circuit.
Optionally, the interfacing circuitry includes electric feed signal processing circuit, and the electric feed signal processing circuit is used for
Detection sends electric feed signal；
When the interfacing circuitry, which belongs to input interface, connects circuit, the input interface connection circuit includes that heat is inserted
Detection HPD signal transmission circuit is pulled out, the HPD signal transmission circuit is for sending HPD signal；Alternatively, when the interface connects
When circuit belongs to output interface connection circuit, the output interface connection circuit includes HPD signal detection circuit, the HPD letters
Number detection circuit is for detecting the HPD signal.
It is different according to the type of cable interface in practical application scene, the structure of the interfacing circuitry of local device
It may also differ.For example, some cable interfaces may include to input electric feed signal line and hot plug signal lines, e.g.,
The interfaces such as DVI, HDMI, display interface (Display Port, DP), VGA.When being docked with such cable interface, local device
Interfacing circuitry in be also required to be provided with corresponding circuit.In this way, improving the applicability for power detection circuit.
Second aspect provides a kind of detection method altogether, is applied in the total ground detection circuit described in first aspect, institute
The method of stating includes：
When the switching circuit is off, the voltage detecting circuit detects the electricity of the earth signal output end
Pressure value；
When the voltage value that the voltage detecting circuit detects meets preset condition, the local device and opposite end are determined
Altogether, the opposite equip. refers to the equipment being connect with the local device by the cable interface to equipment；
When the voltage value that the voltage detecting circuit detects does not meet the preset condition, the local device is determined
Not altogether with the opposite equip..
Optionally, the interface connector includes metal shell and is exported the metal shell as the earth signal
End；
After the voltage detecting circuit detects the voltage value of the earth signal output end, further include：
When the voltage value that the voltage detecting circuit detects is less than predetermined threshold value, the voltage detecting circuit inspection is determined
The voltage value measured meets the preset condition；
When the voltage value that the voltage detecting circuit detects is greater than or equal to the predetermined threshold value, the voltage is determined
The voltage value that detection circuit detects does not meet the preset condition.
Optionally, the interface connector includes the metal shell and designated pin and by the metal shell and described
Designated pin is used as the earth signal output end；
The voltage detecting circuit detects the voltage value of the earth signal output end, including：
The voltage detecting circuit detects sheath voltage value and pin voltage value respectively, and the sheath voltage value is the gold
Belong to the voltage value on shell, the pin voltage value is the voltage value in the designated pin；
After the voltage detecting circuit detects the voltage value of the earth signal output end, further include：
If the sheath voltage value and the pin voltage value are respectively less than predetermined threshold value, it is determined that the voltage detecting circuit
The voltage value detected meets the preset condition；
If the sheath voltage value and/or the pin voltage value are greater than or equal to the predetermined threshold value, it is determined that described
The voltage value that voltage detecting circuit detects does not meet the preset condition.
Optionally, it is described when the switching circuit is off before, further include：
If the interfacing circuitry belongs to input interface connection circuit and includes electric feed signal processing circuit, when described
When control process unit detects the electric feed signal based on the electric feed signal processing circuit in input interface connection circuit,
Disconnect the switching circuit；Or,
If the interfacing circuitry belongs to output interface connection circuit and includes the electric feed signal processing circuit and HPD
Signal deteching circuit then connects the HPD signal detection circuit in circuit when the control process unit based on the output interface
When detecting the HPD signal, the switching circuit is disconnected, the HPD signal is that the opposite equip. is receiving described
The signal fed back when the electric feed signal that end equipment is sent, the electric feed signal handle electricity by the electric feed signal of the local device
Road is sent when receiving power on signal.
Optionally, if the interfacing circuitry belongs to input interface connection circuit, the interfacing circuitry further includes
The HPD signal transmission circuit；
The electric feed signal processing circuit inspection connected based on the input interface when the control process unit in circuit
When measuring the electric feed signal, after disconnecting the switching circuit, further include：
The HPD signal transmission circuit sends the HPD signal to the opposite equip..
The advantageous effect that technical solution provided in an embodiment of the present invention is brought is：Connect by cable interface and opposite equip.
During connecing, when switching circuit is off, the earth signal output end of interface connector and the reference of local device
Ground disconnects, at this point, voltage detecting circuit detects the voltage value of the earth signal output end.Since the earth signal output end is used for
The earth signal that output cord interface is transmitted when interfacing circuitry is docked by interface connector with cable interface, and the electricity
It is the reference ground of local device to press the reference planes of detection circuit, and therefore, the voltage value detected is regarded as local device
Voltage difference between opposite equip..When the voltage value meets preset condition, local device and opposite equip. are determined altogether, instead
It determines local device and opposite equip. not altogether when the voltage value does not meet the preset condition.In this way, passing through cable
During interface is connect with opposite equip., it can whether altogether detect automatically with opposite equip., avoid the need for user and grasp manually
Make, improves detection efficiency.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram of detection circuit altogether shown according to an exemplary embodiment；
Fig. 2 is a kind of structural schematic diagram of the detection circuit altogether shown according to another exemplary embodiment；
Fig. 3 is a kind of structural schematic diagram of the detection circuit altogether shown according to another exemplary embodiment；
Fig. 4 is a kind of structural schematic diagram of the detection circuit altogether shown according to another exemplary embodiment；
Fig. 5 is a kind of structural schematic diagram of the detection circuit altogether shown according to another exemplary embodiment；
Fig. 6 is a kind of structural schematic diagram of the detection circuit altogether shown according to another exemplary embodiment；
Fig. 7 is a kind of flow chart of detection method altogether shown according to an exemplary embodiment.
Reference numeral：
1：Control process unit, 2：Switching circuit, 3：Voltage detecting circuit, 4：Interface connector, 5：Cable interface；
11：Interfacing circuitry；
21：Control terminal, 22：First signal end, 23：Second signal end, 24：Relay；
241：Coil, 242：Normally opened contact, 243：Normally-closed contact；
31：Ground terminal, 32：Test side；
41：Earth signal output end；
411：Designated pin, 412：Metal shell.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with attached drawing to the present invention
Embodiment is described in further detail.
Fig. 1 is a kind of structural schematic diagram of detection circuit altogether shown according to an exemplary embodiment, this is detected altogether
Circuit includes：Control process unit 1, switching circuit 2, voltage detecting circuit 3 and interface connector 4, and the control process unit 1
Including interfacing circuitry 11, which connect with the interface connector 4 and for passing through the interface connector 4
It is docked with external cable interface 5.The control process unit 1 is connect with the control terminal 21 of the switching circuit 2, is opened for controlling this
The closure on powered-down road 2 and shutdown, the first signal end 22 of the switching circuit 2 and the ground terminal 31 of the voltage detecting circuit 3 are distinguished
Connect with reference ground, the second signal end 23 of the switching circuit 2 and the test side 32 of the voltage detecting circuit 3 respectively with the interface
The earth signal output end 41 of connector 4 connects, which is used to pass through the interface when the interfacing circuitry 11
Connector 4 exports the earth signal that the cable interface 5 is transmitted when being docked with the cable interface 5.
Wherein, the control process unit 1 based on interfacing circuitry 11 for being detected whether through cable interface 5 and opposite end
Equipment connects.In addition, the control process unit 1 can be also used for handling the audio or video data that opposite equip. is sent
Deng the embodiment of the present invention is not construed as limiting this.
Wherein, above-mentioned voltage detecting circuit 3 can be used for detecting the voltage value on connected earth signal output end 41.Into
One step, may include having voltage checking chip in the voltage detecting circuit 3, for example, the voltage checking chip can be modulus
(Analog-to-Digital Converter, AD) chip is converted, in this way, the voltage detecting circuit 3 can pass through the A/D chip
Receive the voltage signal of the earth signal output end 41, and will be after the voltage signal that received carries out analog-to-digital conversion, you can obtain
The voltage value of the earth signal output end 41.
During actually realizing, which can be linked into an independent reference ground, wherein should
Reference ground is only connect by switching circuit 2 with the reference ground of local device, as shown in Figure 1, the reference ground is properly termed as GND
(grand) or protecting field (Protect Grand, PGND).When the earth signal output end 41 is linked into the independent reference ground
When, the second signal end 23 of said switching circuit 2 and the test side 32 of the voltage detecting circuit 3 can be respectively connected to the reference ground
On, to realize switching circuit 2 second signal end 23 and the voltage detecting circuit 3 test side 32 it is defeated with earth signal respectively
The connection of outlet 41.What needs to be explained here is that the connection between the earth signal output end 41 being described below can be with
Using this kind of realization method, no longer repeat one by one hereinafter.
Wherein, said switching circuit 2 can be controlled it by control process unit 1 and disconnect and be closed.If at the switching circuit 2
It is connected between closed state, the reference ground and earth signal output end 41 of local device, if the switching circuit 2, which is in, disconnects shape
State, the reference ground and earth signal output end 41 of local device are not connected.
Further, referring to FIG. 2, in one possible implementation, which may include relay
24.When the switching circuit 2 includes relay 24, which connect with the coil 241 in the relay 24, should
Normally opened contact 242 in relay 24 is connect with the reference ground, the normally-closed contact 243 in the relay and the earth signal output end
41 connections.
In practical application scene, which can be with by whether the coil 241 for the relay 24 be powered
To control closure or the disconnection of the switching circuit 2.For example, when the control process unit 1 is that the coil 241 is powered, it is attracted normal
Open contact 242 and normally-closed contact 243 so that the relay 24 is in closed state.Stop being the relay when control process unit 1
When the coil 241 of device 24 is powered, the normally opened contact 242 and normally-closed contact 243 disconnect, and are disconnected so that the relay 24 is in
State.
In total ground detection process, when switching circuit 2 is off, voltage detecting circuit 3 detects the earth signal
The voltage value of output end 41.Due to being contacted firmly between earth signal output end 41 and cable interface 4, and voltage detecting circuit 3 connects
Ground terminal 31 is using reference ground as reference planes, and therefore, the voltage value which is detected is equivalent to local device
The voltage difference of the voltage of voltage and opposite equip..When the voltage value that the voltage detecting circuit 3 detects meets preset condition, really
Determine between local device and opposite equip. altogether, when the voltage value that the voltage detecting circuit 3 detects does not meet the preset condition
When, it determines between local device and opposite equip. not altogether, in this way, realizing between automatic detection local device and opposite equip.
Whether altogether, detection efficiency is improved.Wherein, which can pre-set.
Further, in practical applications, different with the model of corresponding interface connector 4 according to cable interface 5, it is different
The cable interface 5 of model and the construction of corresponding interface connector 4 may differ widely.When cable interface 5 and corresponding interface
When the construction of connector 4 differs, the second signal end 23 of said switching circuit 2 and the test side 32 of voltage detecting circuit 3 are divided
May not be also different from the connection type of earth signal output end 41, it can specifically include following several possible realization methods：
First way：If referring to FIG. 1, the interface connector 4 includes metal shell 412 and by the metal shell 412
As the earth signal output end 41, then the second signal end 23 of the switching circuit 2 and the test side 32 of the voltage detecting circuit 3 are divided
It is not connect with the metal shell 412.
For this kind of realization method, after above-mentioned voltage detecting circuit 3 detects the voltage value of earth signal output end 41, when this
When the voltage value that voltage detecting circuit 3 detects is less than predetermined threshold value, the voltage value symbol that the voltage detecting circuit 3 detects is determined
The preset condition is closed, when the voltage value that the voltage detecting circuit 3 detects is greater than or equal to the predetermined threshold value, determines the voltage
The voltage value that detection circuit 3 detects does not meet the preset condition.
Wherein, which can be arranged in advance.When the voltage value that the voltage detecting circuit 3 detects is less than default threshold
When value, illustrate that the voltage difference between local device and opposite equip. is smaller, hence, it can be determined that local device is total with opposite equip.
Ground, i.e., the voltage value that the voltage detecting circuit 3 detects meet the preset condition.When the electricity that the voltage detecting circuit 3 detects
When pressure value is greater than or equal to the predetermined threshold value, illustrate that the voltage difference between local device and opposite equip. is larger, at this point it is possible to really
Determine local device and opposite equip. not altogether, i.e., the voltage value that the voltage detecting circuit 3 detects does not meet the preset condition.
The second way：If referring to FIG. 3, the interface connector 4 include the metal shell 412 and designated pin 411 and
It regard the metal shell 412 and the designated pin 411 as the earth signal output end 41, then the second signal of the switching circuit 2
End 23 is separately connected with the metal shell 412 and the designated pin 411, test side 32 and the metal of the voltage detecting circuit 3
Shell 412 and the designated pin 411 are separately connected, which is used to export in the cable interface 4 and the designated pin
The earth signal that 411 corresponding earth signal lines are transmitted.
Unlike above-mentioned first way, in this kind of realization method, the interface connector 4 is in addition to including the metal
Further include designated pin 411 except shell 412, at this point, being also equipped in cable interface 5 correspondingly with the designated pin 411
Signal wire, wherein the earth signal line can be used for transmitting earth signal, which can be PGND, or GND, this public affairs
Embodiment is opened not limit this.
In this kind of connection type, above-mentioned voltage detecting circuit 3 detects the realization of the voltage value of earth signal output end 41
Journey includes：The voltage detecting circuit 3 detects sheath voltage value and pin voltage value respectively, which is the metal shell
Voltage value on 412, the pin voltage value are the voltage value in the designated pin 411.
In practical applications, the PGND and GND of opposite equip. may link together, it is also possible to be not attached to together.
When the PGND of opposite equip. and GND link together, opposite equip. only transmits an earth signal by the cable interface 4.So
And when the PGND and GND are not attached to together, and include earth signal corresponding with designated pin 411 in the cable interface 4
When line, opposite equip. may be transferred to two earth signals of local device by the cable interface 4, and in that case, local terminal is set
It is standby two earth signals to be exported by the designated pin 411 and the metal shell 412 respectively.In order to detect local device with it is right
Altogether whether, voltage detecting circuit 3 needs to detect voltage value and the designated pin on the metal shell 412 respectively to end equipment
Voltage value on 411.
If the sheath voltage value and the pin voltage value are respectively less than predetermined threshold value, it is determined that the voltage detecting circuit 3 detects
To voltage value meet above-mentioned preset condition, if the sheath voltage value and/or the pin voltage value are greater than or equal to the default threshold
Value, it is determined that the voltage value that the voltage detecting circuit 3 detects does not meet the preset condition.
Wherein, if the above-mentioned sheath voltage value and/or the pin voltage value are greater than or equal to the predetermined threshold value, it is determined that should
The voltage value that voltage detecting circuit 3 detects does not meet the preset condition：If it is pre- that the sheath voltage value is greater than or equal to this
If threshold value, then it can determine that the voltage value that the voltage detecting circuit 3 detects does not meet the preset condition；If alternatively, the pin
Voltage value is greater than or equal to the predetermined threshold value, then can also determine that the voltage value that the voltage detecting circuit 3 detects does not meet this
Preset condition；If alternatively, the sheath voltage value and the pin voltage value are all higher than or are equal to the predetermined threshold value, same determine should
The voltage value that voltage detecting circuit 3 detects does not meet the preset condition.
That is to say, if the sheath voltage value and the pin voltage value are respectively less than predetermined threshold value, it is determined that local device with it is right
End equipment altogether, if the sheath voltage value and/or the pin voltage value are greater than or equal to the predetermined threshold value, can determine local terminal
Equipment and opposite equip. are not altogether.
Further, above-mentioned interfacing circuitry 11 includes electric feed signal processing circuit, which uses
In detection or send electric feed signal.In addition, when the interfacing circuitry 11 belongs to input interface and connects circuit, the input interface
Connection circuit includes hot plug detection (Hot Plug Detection, HPD) signal sending circuit, the HPD signal transmission circuit
For sending HPD signal；When the interfacing circuitry 11, which belongs to output interface, connects circuit, which connects circuit packet
HPD signal detection circuit is included, the HPD signal detection circuit is for detecting the HPD signal.
It is different according to the type of cable interface 4 in practical application scene, the knot of the interfacing circuitry 11 of local device
Structure may be differed also.For example, some cable interfaces 4 may include to input electric feed signal line and hot plug signal lines,
Such as, the interfaces such as DVI, HDMI, display interface (Display Port, DP), VGA.When being docked with such cable interface, local terminal is set
It is also required to be provided with corresponding circuit in standby interfacing circuitry 11.
In addition, in practical application scene, which may belong to input interface connection circuit, it is also possible to
Belong to output interface connection circuit.For example, when local device is the equipment of such as display or the like, the interfacing circuitry
11 belong to input interface connection circuit, when local device is the equipment of such as host computer or the like, the interfacing circuitry
11 belong to output interface connection circuit.
According to the structure of interfacing circuitry and classification difference, the normality of the switching circuit is typically different.When the interface connects
It includes electric feed signal processing circuit and HPD signal detection circuit to connect in circuit, or include electric feed signal processing circuit and
When HPD signal transmission circuit, the interfacing circuitry is for handling electric feed signal and hot plug detection signal.In order to stabilization
It receives electric feed signal or hot plug detects signal, the normality of the switching circuit 2 is usually closed state, which refers to not leading to
Cross the state before cable interface 5 is connect with opposite equip..Therefore, operation is detected altogether in order to realize, electricity is connected according to interface
11 generic of road is different with the circuit that inside includes, it is above-mentioned when switching circuit 2 is off before, need disconnect should
Switching circuit 2 can specifically include following several realization methods：
(1) if the interfacing circuitry 11 belongs to input interface connection circuit and includes electric feed signal processing circuit, when
When the control process unit 1 detects the electric feed signal based on the electric feed signal processing circuit in input interface connection circuit,
Disconnect switching circuit 2.
If local device is input equipment, for example, the input equipment can be display etc., then the interfacing circuitry 11
Belong to input interface connection circuit and may include electric feed signal processing circuit.At this point, when the control process unit 1 is based on being somebody's turn to do
When electric feed signal processing circuit in input interface connection circuit detects the electric feed signal, illustrate local device and opposite equip.
It is connected by cable interface 4, and opposite equip. prepares to local device transmission data or signal, is needed at this point it is possible to determine
Switching circuit 2 is disconnected to execute detection process altogether.
Further, if the interfacing circuitry 11 belongs to input interface connection circuit, which also wraps
HPD signal transmission circuit is included, after disconnecting switching circuit 2, which sends HPD letters to the opposite equip.
Number.
Referring to FIG. 4, when local device receives the electric feed signal, in order to notify opposite equip. to be ready for receiving audio
Or video data, the HPD signal transmission circuit of local device send the HPD signal to the opposite equip..
(2) if the interfacing circuitry 11 belong to output interface connection circuit and include the electric feed signal processing circuit and
HPD signal detection circuit then connects the HPD signal detection circuit in circuit when the control process unit 1 based on the output interface
When detecting the HPD signal, switching circuit 2 is disconnected, which is that the opposite equip. is receiving local device transmission
The signal fed back when electric feed signal, the electric feed signal are receiving upper telecommunications by the electric feed signal processing circuit of the local device
Number when send.
Referring to FIG. 5, if local device is output equipment, for example, the output equipment can be host computer etc., then this connects
Mouth connection circuit 11 belongs to output interface connection circuit and may include the electric feed signal processing circuit and HPD signal detection electricity
Road.In practical application scene, when the electric feed signal processing circuit of local device is when receiving power on signal, it will usually pass through
Cable interface 4 sends electric feed signal to opposite equip., for example, the electric feed signal can be 5V high level signals.
Correspondingly, as it was noted above, after opposite equip. receives the electric feed signal, HPD signal can be fed back to local device,
At this point, the determination of control process unit 1 needs the disconnection execution of switching circuit 2 to detect operation altogether.
Certainly, above-mentioned carried out so that cable interface 4 includes input electric feed signal line and hot plug signal lines as an example
For example, in the realization method of another possibility, which may not include input electric feed signal line and heat
Plug signal lines, e.g., CVBS, the Radio Corporation of America (Radio Corporation of American, RCA) interface,
3.5mm line interfaces etc., in that case, the interfacing circuitry 4 do not include above-mentioned electric feed signal processing circuit, HPD
Signal sending circuit and HPD signal detection circuit, for example, please referring to Fig. 6.
If the interfacing circuitry 11 does not include the electric feed signal processing circuit, the HPD signal transmission circuit and HPD letters
Number detection circuit, then the switching circuit 2 be generally in off-state, which will detect interface company in real time
Connect the earth signal output end 41 of device 4.
In embodiments of the present invention, during being connect with opposite equip. by cable interface, when switching circuit is in
When off-state, the earth signal output end of interface connector and the reference ground of local device disconnect, at this point, voltage detecting is electric
Detect the voltage value of the earth signal output end in road.Since the earth signal output end is used to connect by interface when interfacing circuitry
The earth signal that output cord interface is transmitted when device is docked with cable interface, and the reference planes of the voltage detecting circuit are local
The reference ground of equipment, therefore, the voltage value detected are regarded as the voltage difference between local device and opposite equip..When this
When voltage value meets preset condition, local device and opposite equip. are determined altogether, conversely, when the voltage value does not meet the default item
When part, determine local device and opposite equip. not altogether.In this way, during being connect with opposite equip. by cable interface,
It can whether altogether detect automatically with opposite equip., avoid the need for user's manual operation, improve detection efficiency.
Total ground detection circuit based on above-mentioned offer, an embodiment of the present invention provides total ground detection methods, referring to FIG. 7,
The Fig. 7 is a kind of flow chart of detection method altogether shown according to an exemplary embodiment, and detection method can wrap altogether for this
Include the following steps：
Step 701：When switching circuit is off, voltage detecting circuit detects the voltage of the earth signal output end
Value.
According to the structure of interfacing circuitry and classification difference, the normality of the switching circuit is typically different.When the interface connects
It includes electric feed signal processing circuit and HPD signal detection circuit to connect in circuit, or include electric feed signal processing circuit and
When HPD signal transmission circuit, the interfacing circuitry is for handling electric feed signal and hot plug detection signal, at this point, switch electricity
The normality on road is usually closed state, in that case, when switching circuit is off before, further include：
(1) if the interfacing circuitry belongs to input interface connection circuit and includes electric feed signal processing circuit, when this
When control process unit detects the electric feed signal based on the electric feed signal processing circuit in input interface connection circuit, disconnect
Switching circuit.
If local device is input equipment, for example, the input equipment can be display etc., then the interfacing circuitry category
Circuit is connected in input interface and may include electric feed signal processing circuit.At this point, when the control process unit is defeated based on this
When electric feed signal processing circuit in incoming interface connection circuit detects the electric feed signal, illustrate local device with opposite equip.
It is connected by cable interface, and opposite equip. prepares to send audio or video data to local device, at this point, the control process list
Member, which determines, needs to disconnect switching circuit to execute follow-up detection process altogether.
Further, if the interfacing circuitry belongs to input interface connection circuit, which further includes HPD
Signal sending circuit, after determining that the control process unit receives the specified access signal, the HPD signal transmission circuit to this
Opposite equip. sends the HPD signal.
When local device receives the electric feed signal, in order to notify opposite equip. to be ready for receiving audio or video number
According to the HPD signal transmission circuit of local device sends the HPD signal to the opposite equip..
(2) if the interfacing circuitry belongs to output interface connection circuit and includes the electric feed signal processing circuit and HPD
Signal deteching circuit then connects the HPD signal detection circuit detection in circuit when the control process unit based on the output interface
When to the HPD signal, switching circuit is disconnected, which is the opposite equip. in the feed for receiving local device transmission
The signal fed back when signal, the electric feed signal is by the electric feed signal processing circuit of the local device when receiving power on signal
It sends.
If local device is output equipment, for example, the output equipment can be host computer etc., then the interfacing circuitry
Belong to output interface connection circuit and may include the electric feed signal processing circuit and HPD signal detection circuit.In practical application
In scene, when the electric feed signal processing circuit of local device is when receiving power on signal, it will usually by cable interface to right
End equipment sends electric feed signal, for example, the electric feed signal can be 5V high level signals.
Correspondingly, as it was noted above, after opposite equip. receives the electric feed signal, HPD signal can be fed back to local device,
At this point, the control process unit, which can determine, needs to disconnect switching circuit to execute follow-up detection process altogether.
Further, when interface connector include the metal shell and designated pin and by the metal shell and this specified draw
When foot is used as the earth signal output end, which detects sheath voltage value and pin voltage value respectively, the shell
Voltage value is the voltage value on the metal shell, which is the voltage value in the designated pin.
In practical applications, the PGND and GND of opposite equip. may link together, it is also possible to be not attached to together.
When the PGND of opposite equip. and GND link together, opposite equip. may transmit an earth signal by the cable interface.So
And when the PGND and GND are not attached to together, and include earth signal line corresponding with designated pin in the cable interface
When, opposite equip. may be transferred to two earth signals of local device by the cable interface, and local device will be referred to by this respectively
Determine pin and the metal shell exports two earth signals.In order to whether altogether detect local device and opposite equip., voltage inspection
Slowdown monitoring circuit needs to detect the voltage value on the metal shell and the voltage value in the designated pin respectively.
Step 702：When the voltage value that the voltage detecting circuit detects meets preset condition, determine the local device with
Altogether, which refers to the equipment being connect with the local device by the cable interface to opposite equip..
Wherein, which can be arranged in advance.According to preset condition difference, determine that the voltage detecting circuit detects
To voltage value whether meet preset condition mode it is also different, can specifically include following several realization methods：
First way：If the interface connector includes metal shell and is exported the metal shell as the earth signal
End determines what the voltage detecting circuit detected then when the voltage value that the voltage detecting circuit detects is less than predetermined threshold value
Voltage value meets the preset condition, when the voltage value that the voltage detecting circuit detects is greater than or equal to the predetermined threshold value, really
The voltage value that the fixed voltage detecting circuit detects does not meet the preset condition.
As it was noted above, due to the ground terminal of voltage detecting circuit be using reference ground as reference planes, the voltage inspection
The voltage value that slowdown monitoring circuit is detected is equivalent to the voltage difference of the voltage of local device and the voltage of opposite equip..Therefore, when being examined
When the voltage value of survey is less than predetermined threshold value, illustrate that the voltage difference between local device and opposite equip. is smaller, hence, it can be determined that
Local device and opposite equip. are altogether.When the voltage value that the voltage detecting circuit detects is greater than or equal to the predetermined threshold value,
Illustrate that the voltage difference between local device and opposite equip. is larger, at this point it is possible to determine local device and opposite equip. not altogether.
The second way：When the interface connector includes the metal shell and designated pin and refers to the metal shell with this
When determining pin and being used as the earth signal output end, if the sheath voltage value and the pin voltage value are respectively less than predetermined threshold value, really
The voltage value that the fixed voltage detecting circuit detects meets the preset condition, if the sheath voltage value and/or the pin voltage value
More than or equal to the predetermined threshold value, it is determined that the voltage value that the voltage detecting circuit detects does not meet the preset condition.
Wherein, if the above-mentioned sheath voltage value and/or the pin voltage value are greater than or equal to the predetermined threshold value, it is determined that should
The voltage value that voltage detecting circuit 3 detects does not meet the preset condition：If it is pre- that the sheath voltage value is greater than or equal to this
If threshold value, then it can determine that the voltage value that the voltage detecting circuit 3 detects does not meet the preset condition；If alternatively, the pin
Voltage value is greater than or equal to the predetermined threshold value, then can also determine that the voltage value that the voltage detecting circuit 3 detects does not meet this
Preset condition；If alternatively, the sheath voltage value and the pin voltage value are all higher than or are equal to the predetermined threshold value, same determine should
The voltage value that voltage detecting circuit 3 detects does not meet the preset condition.
Step 703：When the voltage value that the voltage detecting circuit detects does not meet the preset condition, determine that the local terminal is set
It is standby with the opposite equip. not altogether.
It should be noted that above-mentioned steps 702 and step 703 execute sequence without priority in actual implementation.
In practical application scene, when detecting local device and opposite equip. not altogether, can by indicator light or
Graphical interfaces prompts user, and in the case where this kind asks condition, user can be by miscellaneous equipment come the reason of detection not altogether, and is directed to institute
The reason of detecting takes corresponding strategy.For example, in one possible implementation, it is possible to due to cable interface
Connection, which loosens, leads to local device and opposite equip. differently, and in that case, user can reinsert cable interface.
In embodiments of the present invention, during being connect with opposite equip. by cable interface, when switching circuit is in
When off-state, the earth signal output end of interface connector and the reference ground of local device disconnect, at this point, voltage detecting is electric
Detect the voltage value of the earth signal output end in road.Since the earth signal output end is used to connect by interface when interfacing circuitry
The earth signal that output cord interface is transmitted when device is docked with cable interface, and the reference planes of the voltage detecting circuit are local
The reference ground of equipment, therefore, the voltage value detected are regarded as the voltage difference between local device and opposite equip..When this
When voltage value meets preset condition, local device and opposite equip. are determined altogether, conversely, when the voltage value does not meet the default item
When part, determine local device and opposite equip. not altogether.In this way, during being connect with opposite equip. by cable interface,
It can whether altogether detect automatically with opposite equip., avoid the need for user's manual operation, improve detection efficiency.
It should be noted that：Above-described embodiment provide total ground detection circuit when realizing detection method altogether, only more than
The division progress of each function module is stated for example, in practical application, it can be as needed and by above-mentioned function distribution by difference
Function module complete, i.e., the internal structure of equipment is divided into different function modules, with complete it is described above whole or
Person's partial function.In addition, detection method embodiment belongs to same design to the total ground detection circuit of above-described embodiment offer together,
Its specific implementation process refers to embodiment of the method, and which is not described herein again.
One of ordinary skill in the art will appreciate that realizing that all or part of step of above-described embodiment can pass through hardware
It completes, relevant hardware can also be instructed to complete by program, the program can be stored in a kind of computer-readable
In storage medium, storage medium mentioned above can be read-only memory, disk or CD etc..
Embodiment described above is not intended to limit the invention embodiment, all spirit and principle in the embodiment of the present invention it
Interior, any modification, equivalent replacement, improvement and so on should be included within the protection domain of the embodiment of the present invention.
Claims (9)
1. a kind of detection circuit altogether, which is characterized in that the detection circuit altogether includes：Control process unit, switching circuit,
Voltage detecting circuit and interface connector, and the control process unit includes interfacing circuitry, the interfacing circuitry
It is connect with the interface connector and for being docked with external cable interface by the interface connector；
The control process unit is connect with the control terminal of the switching circuit, the closure for controlling the switching circuit and pass
Disconnected, the first signal end of the switching circuit and the ground terminal of the voltage detecting circuit are connect with reference ground respectively, described to open
The second signal end on powered-down road and the test side of the voltage detecting circuit are exported with the earth signal of the interface connector respectively
End connection, the earth signal output end are used to pass through the interface connector and the cable interface when the interfacing circuitry
The earth signal that the cable interface is transmitted is exported when docking.
2. detection circuit altogether as described in claim 1, which is characterized in that
If the interface connector includes metal shell and using the metal shell as the earth signal output end, described to open
The second signal end on powered-down road and the test side of the voltage detecting circuit are connect with the metal shell respectively；
If the interface connector includes the metal shell and designated pin and by the metal shell and the designated pin
It is used as the earth signal output end, then the second signal end of the switching circuit and the metal shell and the designated pin
It is separately connected, the test side of the voltage detecting circuit is separately connected with the metal shell and the designated pin, the finger
Pin is determined for exporting the earth signal that earth signal line corresponding with the designated pin is transmitted in the cable interface.
3. detection circuit altogether as described in claim 1, which is characterized in that the switching circuit includes relay, the control
Processing unit processed is connect with the coil in the relay, and the normally opened contact in the relay is connect with the reference ground, institute
The normally-closed contact stated in relay is connect with the earth signal output end.
4. detection circuit altogether as described in claim 1, which is characterized in that the interfacing circuitry includes at electric feed signal
Circuit is managed, the electric feed signal processing circuit is for detecting or sending electric feed signal；
When the interfacing circuitry, which belongs to input interface, connects circuit, the input interface connection circuit includes hot plug inspection
HPD signal transmission circuit is surveyed, the HPD signal transmission circuit is for sending HPD signal；Alternatively,
When the interfacing circuitry, which belongs to output interface, connects circuit, the output interface connection circuit includes HPD signal
Detection circuit, the HPD signal detection circuit is for detecting the HPD signal.
5. a kind of detection method altogether is applied in any total ground detection circuits of claim 1-4, which is characterized in that
The method includes：
When the switching circuit is off, the voltage detecting circuit detects the voltage of the earth signal output end
Value；
When the voltage value that the voltage detecting circuit detects meets preset condition, the local device and opposite equip. are determined
Altogether, the opposite equip. refers to the equipment being connect with the local device by the cable interface；
When the voltage value that the voltage detecting circuit detects does not meet the preset condition, the local device and institute are determined
State opposite equip. not altogether.
6. method as claimed in claim 5, which is characterized in that the interface connector includes metal shell and by the metal
Shell is as the earth signal output end；
After the voltage detecting circuit detects the voltage value of the earth signal output end, further include：
When the voltage value that the voltage detecting circuit detects is less than predetermined threshold value, determine that the voltage detecting circuit detects
Voltage value meet the preset condition；
When the voltage value that the voltage detecting circuit detects is greater than or equal to the predetermined threshold value, the voltage detecting is determined
The voltage value that circuit detects does not meet the preset condition.
7. method as claimed in claim 5, which is characterized in that the interface connector includes that the metal shell draws with specified
Foot and by the metal shell and the designated pin be used as the earth signal output end；
The voltage detecting circuit detects the voltage value of the earth signal output end, including：
The voltage detecting circuit detects sheath voltage value and pin voltage value respectively, and the sheath voltage value is outside the metal
Voltage value on shell, the pin voltage value are the voltage value in the designated pin；
After the voltage detecting circuit detects the voltage value of the earth signal output end, further include：
If the sheath voltage value and the pin voltage value are respectively less than predetermined threshold value, it is determined that the voltage detecting circuit detection
To voltage value meet the preset condition；
If the sheath voltage value and/or the pin voltage value are greater than or equal to the predetermined threshold value, it is determined that the voltage
The voltage value that detection circuit detects does not meet the preset condition.
8. method as claimed in claim 5, which is characterized in that it is described when the switching circuit is off before,
Further include：
If the interfacing circuitry belongs to input interface connection circuit and includes electric feed signal processing circuit, when the control
When processing unit detects the electric feed signal based on the electric feed signal processing circuit in input interface connection circuit, disconnect
The switching circuit；Or,
If the interfacing circuitry belongs to output interface connection circuit and includes the electric feed signal processing circuit and HPD signal
Detection circuit then connects the HPD signal detection circuit detection in circuit when the control process unit based on the output interface
When to the HPD signal, the switching circuit is disconnected, the HPD signal, which is the opposite equip., to be set receiving the local terminal
The signal fed back when the electric feed signal that preparation is sent, the electric feed signal are existed by the electric feed signal processing circuit of the local device
It is sent when receiving power on signal.
9. method as claimed in claim 8, which is characterized in that if the interfacing circuitry belongs to input interface connection electricity
Road, the interfacing circuitry further include the HPD signal transmission circuit；
It is described to be detected when the control process unit connects the electric feed signal processing circuit in circuit based on the input interface
When the electric feed signal, after disconnecting the switching circuit, further include：
The HPD signal transmission circuit sends the HPD signal to the opposite equip..
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710016821.8A CN108287289B (en) | 2017-01-10 | 2017-01-10 | Common ground detection circuit and detection method thereof |
| PCT/CN2018/071788 WO2018130129A1 (en) | 2017-01-10 | 2018-01-08 | Common ground detection circuit and detection method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710016821.8A CN108287289B (en) | 2017-01-10 | 2017-01-10 | Common ground detection circuit and detection method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108287289A true CN108287289A (en) | 2018-07-17 |
| CN108287289B CN108287289B (en) | 2020-04-21 |
Family
ID=62819520
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710016821.8A Active CN108287289B (en) | 2017-01-10 | 2017-01-10 | Common ground detection circuit and detection method thereof |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN108287289B (en) |
| WO (1) | WO2018130129A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113009266A (en) * | 2021-03-18 | 2021-06-22 | 广州亚美智造科技有限公司 | Jig plugging detection circuit |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN108287289B (en) | 2020-04-21 |
| WO2018130129A1 (en) | 2018-07-19 |
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