CN113923393B - Signal converter - Google Patents
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- CN113923393B CN113923393B CN202111217438.1A CN202111217438A CN113923393B CN 113923393 B CN113923393 B CN 113923393B CN 202111217438 A CN202111217438 A CN 202111217438A CN 113923393 B CN113923393 B CN 113923393B
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- 238000000034 method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/01—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level
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- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
Abstract
The application discloses a signal converter which comprises N signal source interfaces, a switching chip and a video conversion module. The N signal source interfaces are respectively connected with different signal sources, can receive video signals sent by different signal sources, and only one signal source interface is connected with a signal source corresponding to the signal source interface at a time, so that the switching chip receives the video signals sent by the signal source interfaces connected with the signal sources, the video conversion module converts the video signals based on parameters of the display module, and the display module displays images corresponding to the video signals. Therefore, the signal converter can transmit different video signals received by different signal source interfaces to the video conversion module, and when the signal source is changed, the corresponding signal source interface is connected with the signal source interface, so that the signal converter is not required to be additionally arranged, and the cost is reduced.
Description
Technical Field
The present application relates to the field of communications, and in particular, to a signal converter.
Background
There are many signal sources on the market, such as USB-C (USB Type-C) signal source and Mini DP (Mini display port) signal source, and for displaying on a display device with an HDMI (High Definition Multimedia Interface, high-definition multimedia interface), a USB-C to HDMI converter or a Mini DP to HDMI converter is required for signal conversion. Obviously, when using different signal sources, two signal converters need to be prepared, that is, the prior art cannot realize the goal of converting USB-C into HDMI and Mini DP into HDMI in the same converter, which results in complicated signal converters and higher use cost.
Disclosure of Invention
The application aims to provide a signal converter, a switching chip can transmit different video signals received by different signal source interfaces to a video conversion module, and when a signal source is changed, the corresponding signal source interface is connected with the signal source interface without additionally arranging the signal converter, so that the cost is reduced.
In order to solve the technical problems, the application provides a signal converter, which comprises an input end, a switching chip connected with the input end, a video conversion module connected with the switching chip, and an output end connected with the video conversion module;
the input end comprises N signal source interfaces connected with different signal sources and is used for receiving video signals sent by the signal sources after being connected with the corresponding signal sources; and only one of the signal source interfaces is connected with the corresponding signal source at a time; n is an integer greater than 1;
the switching chip is used for receiving the video signal sent by the signal source interface after the signal source is connected;
the video conversion module is connected with a display module through the output end and is used for converting the video signal based on the parameters of the display module, and the converted video signal is sent to the display module through the output end by the output end so that the display module can display the image corresponding to the video signal.
Preferably, N is 2, and the two signal source interfaces are respectively a Mini display interface Mini DP and a USB-C.
Preferably, the USB-C is further configured to output a first voltage through its own power output terminal after being connected to a USB-C signal source, and the video conversion module is further configured to output a first level from its own control terminal after the display module is powered on;
the signal converter further comprises a first voltage conversion module connected with the power output end of the USB-C and used for converting the first voltage output by the power output end of the USB-C into a second voltage;
the first end is connected with the output end of the first voltage conversion module, the second end is connected with the control end of the video conversion module, and the third end is connected with the control signal input end of the Mini DP; after the Mini DP is connected with a Mini DP signal source, and before the display module is powered on, setting the control end of the video conversion module as the second level, and setting the third end of the video conversion module as the first level after the control end of the video conversion module outputs the first level, so that the control signal input end of the Mini DP is set as the first level;
the protocol communication interface of the video conversion module is connected with the protocol communication interface of the USB-C, and is further used for carrying out protocol communication with the USB-C when the level of the control end of the video conversion module is the first level before the display module is electrified, and receiving the video signal transmitted by the USB-C through the switching chip; and before the display module is electrified, when the level of the control end of the display module is the second level, the video signal transmitted by the Mini DP through the switching chip is received. Preferably, the first control circuit includes:
the first end is a first resistor of the first end of the first control circuit;
the first end is connected with the second end of the first resistor, the second end is connected with the second resistor, the third end is a switch connected with the second end of the first control circuit and the control end of the video conversion module, and the switch is used for connecting the first end of the switch with the third end of the switch when the USB-C is connected with the USB-C signal source based on the setting of a user, namely the control end of the video conversion module is connected with the output end of the first voltage conversion module; when the Mini DP is connected with a signal source of the Mini DP, the second end of the Mini DP is connected with the third end of the Mini DP, namely the control end of the video conversion module is connected with the first end of the second resistor;
the first end is connected with the control signal input end of the Mini DP, and the second end is grounded. Preferably, a second control circuit is also included;
the power output end of the USB-C is connected with the first control end and the second control end of the switching chip through the second control circuit;
the power output end of the Mini DP is connected with the second control end of the switching chip and is connected with the first control end of the switching chip through the second control circuit;
the USB-C is also used for outputting a first voltage through the power output end of the USB-C signal source after being connected with the USB-C signal source so that the first control end of the switching chip is a first level through the second control circuit and the second control end is a second level;
the Mini DP is also used for outputting a second voltage through a power supply output end of the Mini DP after being connected with a signal source of the Mini DP so that a second control end of the switching chip is the first level, and the first control end of the switching chip is the first level through the second control circuit;
the switching chip is specifically configured to conduct an input terminal connected to the USB-C when a first control terminal of the switching chip is the first level and a second control terminal is the second level, so as to receive the video signal sent by the USB-C; and when the first control end and the second control end of the video signal transmitting device are both the first level, the input end connected with the Mini DP is conducted so as to receive the video signal transmitted by the Mini DP.
Preferably, the power supply further comprises a first voltage conversion module, wherein the input end of the first voltage conversion module is connected with the power supply output end of the USB-C, and the first voltage conversion module is used for converting the first voltage output by the power supply output end of the USB-C into the second voltage;
the second control circuit includes:
the first end is connected with the output end of the first voltage conversion module, and the second end is connected with the third resistor of the first control end of the switching chip and is used for enabling the first control end of the switching chip to be at a first level when the first end of the third resistor is at the second voltage;
a fourth resistor having a first end connected to the first end of the third resistor;
the first end is connected with the fourth resistor, the second end is grounded, and the control end is connected with the power output end of the Mini DP and is used for conducting when the power output end of the Mini DP outputs the first voltage so that the first end of the switch tube is the second level;
the first end is connected with the control end of the third switching tube, and the second end is grounded to a fifth resistor;
the first end is connected with the first end of the fourth resistor, the second end is connected with the power output end of the Mini DP, and the control end is connected with the second switching tube connected with the first end of the third switching tube and used for being conducted when the control end of the second switching tube is the second level so that the first end of the third resistor is the second voltage.
Preferably, the output end of the first voltage conversion module is also connected with a first power end of the video conversion module; the first end of the third resistor is also connected with a first power end of the video conversion module;
the signal converter further includes:
the input end is connected with the power output end of the first voltage conversion module, and the output end is connected with the second power end of the video conversion module and is used for converting the second voltage into a third voltage;
the USB-C is also used for supplying power to the video conversion module through the first voltage conversion module and the second voltage conversion module when being connected with the USB-C signal source;
and the Mini DP is also used for supplying power to the video conversion module through the second control circuit and the second voltage conversion module when being connected with the Mini DP signal source.
Preferably, the power output end of the USB-C is also connected with the power input end of the display module, and the USB-C is also used for supplying power to the display module when being connected with the USB-C signal source;
the signal converter further includes:
the input end is connected with the power output end of the Mini DP, the output end is connected with the charge pump of the power input end of the display module, and the charge pump is used for converting the second voltage output by the power output end of the Mini DP into the first voltage, so that the Mini DP supplies power to the display module through the Mini DP itself when being connected with the signal source of the Mini DP.
Preferably, the method further comprises:
the input end is connected with the power output end of the USB-C, and the output end is connected with the power input end of the display module and is used for preventing backflow;
the input end is connected with the output end of the charge pump, and the output end is connected with the power input end of the display module and is used for preventing backflow.
Preferably, the video signal output end of the video conversion module is connected with the video signal input end of the display module, the communication end is connected with the communication end of the display module, the feedback signal input end is connected with the feedback signal output end of the display module, and the video signal conversion module is specifically used for being in communication connection with the display module when receiving the feedback signal sent by the display module after power is supplied to the display module so as to obtain parameters of the display module, so that the video signal is converted based on the parameters of the display module, and the video signal is sent to the display module through the video signal output end, so that the display module displays images corresponding to the video signal.
The application provides a signal converter which comprises N signal source interfaces, a switching chip and a video conversion module. The N signal source interfaces are respectively connected with different signal sources, can receive video signals sent by different signal sources, and only one signal source interface is connected with a signal source corresponding to the signal source interface at a time, so that the switching chip receives the video signals sent by the signal source interfaces connected with the signal sources, the video conversion module converts the video signals based on parameters of the display module, and the display module displays images corresponding to the video signals. Therefore, the signal converter can transmit different video signals received by different signal source interfaces to the video conversion module, and when the signal source is changed, the corresponding signal source interface is connected with the signal source interface, so that the signal converter is not required to be additionally arranged, and the cost is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required in the prior art and the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a signal converter according to the present application;
fig. 2 is a schematic structural diagram of a signal converter according to the present application.
Detailed Description
The application has the core of providing a signal converter, the switching chip can transmit different video signals received by different signal source interfaces to the video conversion module, and when the signal source is changed, the corresponding signal source interface is connected with the signal source interface without additionally arranging the signal converter, so that the cost is reduced.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a signal converter provided by the present application, where the signal converter includes an input end, a switching chip 2 connected to the input end, a video conversion module 3 connected to the switching chip 2, and an output end connected to the video conversion module 3;
the input end comprises N signal source interfaces 1 connected with different signal sources and is used for receiving video signals sent by the signal sources after being connected with the corresponding signal sources; and only one signal source interface 1 is connected with the corresponding signal source at a time; n is an integer greater than 1;
each input end of the switching chip 2 is connected with each signal source interface 1 in a one-to-one correspondence manner and is used for receiving video signals sent by the signal source interface 1 connected with a signal source;
the video conversion module 3 is connected with the display module through an output end and is used for converting video signals based on parameters of the display module, and the converted video signals are sent to the display module through the output end so that the display module displays images corresponding to the video signals.
The applicant considers that the signal converter in the prior art can be connected with only one signal source, so as to convert the video signal of the signal source, so that the display module displays images corresponding to the video signal, for example, the USB-C signal converter can be connected with only the USB-C signal source, so as to convert the video signal sent by the USB-C signal source; the Mini DP signal converter can only be connected with the Mini DP signal source, so that video signals sent by the Mini DP signal source can be converted; when the signal source is switched from the USB-C signal source to the Mini DP signal source, in the prior art, the USB-C signal converter connected with the display module is required to be pulled out, then the Mini DP signal converter is connected, the operation is more complicated, when the number of the signal sources is more, the number of the converters required to be prepared is also more, the cost is increased along with the number of the converters, and in addition, the service life of the port of the display module is reduced due to the fact that the port connected with the signal converter is plugged in and pulled out for many times.
In order to solve the above-mentioned technical problems, the present application provides a signal converter, the signal converter is provided with an input end, the input end includes a plurality of signal source interfaces 1, each signal source interface 1 can be connected with a different signal source, that is, the signal converter is a multi-input, single-output signal converter, when the signal source needs to be switched, the signal source interface 1 connected with the signal source before switching is disconnected, the signal source interface 1 corresponding to the signal source to be switched is connected with the signal source, the switching chip 2 switches the video signal sent by the signal source before receiving the switching into the video signal sent by the signal source after receiving the switching, so as to realize the switching of the signal sources, and then, the video signal is converted by the video conversion module 3, so that the display module displays the image corresponding to the video signal.
Therefore, the application can realize the receiving and displaying of the video signals of the plurality of signal sources by only preparing the signal converters without preparing the plurality of signal converters, and only switching the connected different signal sources each time, and the port of the display module is not required to be plugged and unplugged, thereby saving the cost, simplifying the operation and prolonging the service life of the display module.
In summary, the switching chip 2 in the present application can transmit different video signals received by different signal source interfaces 1 to the video conversion module 3, and when the signal source changes, the corresponding signal source interface 1 is connected with the signal source interface, so that no additional signal converter is required, and the cost is reduced.
Based on the above embodiments:
referring to fig. 2, fig. 2 is a schematic structural diagram of a signal converter according to the present application.
In this embodiment, two signal source interfaces 1 are taken as an example, and the two signal source interfaces 1 are respectively a Mini DP signal source and a USB-C signal source, and correspondingly, the two signal sources are respectively a Mini DP signal source and a USB-C signal source.
FIG. 2 shows a USB-C signal source connected to the USB-C signal source, transmitting video signals via four DP1 channels, and receiving parameters of the display device via AUX channel; the Mini DP is connected with a Mini DP signal source, then video signals are transmitted through four groups of DP2 channels, and parameters of a display device are received through an AUX channel; and the parameters of the display device are transmitted between the switching chip 2 and the video conversion module 3 through AUXP channels, and video signals are transmitted through four groups of DP3 channels.
As a preferred embodiment, the USB-C is further configured to output a first voltage through its own power output terminal after being connected to the USB-C signal source, and the video conversion module 3 is further configured to output a first level from its own control terminal after the display module is powered on;
the signal converter further comprises a first voltage conversion module connected with the power output end of the USB-C and used for converting the first voltage output by the power output end of the USB-C into a second voltage;
the first end is connected with the output end of the first voltage conversion module, the second end is connected with the control end of the video conversion module 3, the third end is connected with the control signal input end of the Mini DP, and the first control circuit 4 is used for setting the control end of the video conversion module 3 to be a first level and setting the third end of the control circuit to be a second level after the USB-C is connected with the USB-C signal source so that the control signal input end of the Mini DP is set to be a second level; after the Mini DP is connected with a Mini DP signal source, and before the display module is powered on, the control end of the video conversion module 3 is set to be a second level, and after the control end of the video conversion module 3 outputs a first level, the third end of the video conversion module is set to be a first level, so that the control signal input end of the Mini DP is set to be the first level;
the protocol communication interface of the video conversion module 3 is connected with the protocol communication interface of the USB-C, and is also used for carrying out protocol communication with the USB-C when the level of the control end of the display module is a first level before the display module is electrified, and receiving video signals transmitted by the USB-C through the switching chip; and before the display module is electrified, when the level of the control end of the display module is the second level, receiving the video signal transmitted by the Mini DP through the switching chip. The USB-C in this embodiment outputs a first voltage through the power output terminal after being connected to the USB-C signal source, so that the first voltage conversion module converts the first voltage into a second voltage, so that the first end of the first control circuit 4 is the second voltage; when the USB-C is connected with the USB-C signal source, the Mini DP is not connected with the Mini DP signal source, the first end of the first control circuit 4 is at the second voltage, at the moment, the second end of the first control circuit 4 is set at the first level, therefore, the level of the control end of the video conversion module before the power-on of the display device is set at the first level, at the moment, the video conversion module 3 can carry out protocol communication with the USB-C so as to receive video signals sent by the USB-C through the switching chip 2, and because the control end of the video conversion module 3 is at the first level, the video conversion module 3 only receives video signals sent by the USB-C; if the Mini DP is connected to the Mini DP signal source at this time, the level of the control end of the video conversion module 3 is set to the second level before the display device is powered on, and then the second end of the first control circuit 4 is set to the first level after the display device is powered on, so that the level of the control signal input end of the Mini DP is set to the first level, and the Mini DP transmits the video signal to the video conversion module 3 through the switching chip, so that the video conversion module 3 converts the video signal and sends the converted video signal to the display module, and the display module displays the corresponding video.
In the present application, the first voltage may be set to 5V, the second voltage is set to 3.3V, the first level is a high level, and the second level is a low level, but the present application is not limited thereto, and the first voltage and the second voltage may be set according to actual requirements.
In addition, the first end of the first control module is also connected with the power output end of the Mini DP.
It should be noted that, the control signal output end of Mini DP is hot_plug, the control end of video conversion module 3 is GPIO3, the first control end of switching chip 2 is SEL1, the second control end is SEL2, the DC TO DC input with 5V in fig. 2 is the first voltage conversion module, and the DC TO DC output with DVDD09 is the second voltage conversion module.
In addition, when the USB-C or Mini DP transmits the video signal to the video conversion module 3, the parameter of the display module is received through the AUX transmission line in fig. 2, so that the video signal is transmitted through the DP1 or DP2 channel based on the parameter of the display module.
As a preferred embodiment, the first control circuit 4 includes:
a first resistor R1 having a first end as a first end of the first control circuit 4;
the first end is connected with the second end of the first resistor R1, the second end is connected with the second resistor, the third end is a switch K which is connected with the second end of the first control circuit 4 and the control end of the video conversion module, and the switch K is used for connecting the first end of the switch K with the third end of the switch K when the USB-C is connected with the USB-C signal source based on the setting of a user, namely the control end of the video conversion module is connected with the output end of the first voltage conversion module; when the Mini DP is connected with a signal source of the Mini DP, the second end of the Mini DP is connected with the third end of the Mini DP, namely the control end of the video conversion module is connected with the first end of the second resistor;
the first end is connected with the control signal input end of Mini DP, and the second end is grounded. .
The first control circuit 4 in the present embodiment includes a first resistor R1, a switch K, and a second resistor R2, wherein the resistance value of the first resistor R1 may be, but is not limited to, 10kΩ, for example, the first resistance value may be set to 4.7kΩ, or 20kΩ, or still further, 100kΩ; the resistance value of the second resistor R2 may be, but not limited to, 10kΩ, and for example, the second resistance value may be set to 4.7kΩ, or 20kΩ, or still further, 100kΩ, and may be specifically set according to an actual circuit.
It should be noted that, when the switch K in fig. 2 is in the first position, the control end of the video conversion module 3, that is, the level of the GPIO3 is high, and the video conversion module 3 is in the USB-TO HDMI mode; when the switch K is in the second position, the level of the control end of the video conversion module 3, i.e. the GPIO3 is low, and the video conversion module 3 is in Mini DP TO HDMI mode.
As a preferred embodiment, a second control circuit 5 is also included;
the power output end of the USB-C is connected with the first control end and the second control end of the switching chip 2 through the second control circuit 5;
the power output end of the Mini DP is connected with the second control end of the switching chip 2 and is connected with the first control end of the switching chip 2 through the second control circuit 5;
the USB-C is also used for outputting a first voltage through a power output end of the USB-C signal source after being connected with the USB-C signal source so that a first control end of the switching chip 2 is a first level through the second control circuit 5 and a second control end of the switching chip is a second level;
the Mini DP is also used for outputting a second voltage through a power supply output end of the Mini DP after being connected with a signal source of the Mini DP so that a second control end of the switching chip 2 is a first level, and the first control end of the switching chip 2 is a first level through a second control circuit 5;
the switching chip 2 is specifically configured to conduct an input terminal connected to the USB-C when a first control terminal of the switching chip is at a first level and a second control terminal is at a second level, so as to receive a video signal sent by the USB-C; and when the first control end and the second control end of the self are both at the first level, the input end connected with the Mini DP is conducted so as to receive the video signal sent by the Mini DP.
In this embodiment, when the Mini DP is not connected to the Mini DP signal source, the power output terminal of the USB-C will output a first voltage, the power output terminal of the Mini DP will not output a voltage, at this time, the second control circuit 5 will make the first control terminal of the switching chip 2 be at a first level, and the second control terminal be at a second level, at this time, the switching chip 2 is turned on with the USB-C, the switching chip 2 receives the video signal sent by the USB-C, and the video conversion module 3 converts the video signal sent by the USB-C, so that the display module displays the corresponding video.
When the USB-C is not connected to the USB-C signal source and the Mini DP is connected to the Mini DP signal source, the power output terminal of the USB-C will not output a voltage, and the power output terminal of the Mini DP outputs a second voltage, at this time, the second control circuit 5 will make the first control terminal of the switching chip 2 be at the first level, the second control terminal is at the second level, at this time, the switching chip 2 is turned on between the switching chip 2 and the Mini DP, and the switching chip 2 receives the video signal sent by the Mini DP, and the video signal sent by the Mini DP is converted by the video conversion module 3, so that the display module displays the corresponding video.
Based on this, the second control circuit 5 in the present application can control the levels of the two control ends of the switching chip 2 according to the voltages output from the power output ends of the USB-C and Mini DP, so as to control the switching device to switch to the input end connected to the corresponding signal source interface 1 for conduction, thereby realizing the switching of the signal source.
As a preferred embodiment, the power supply further comprises a first voltage conversion module, the input end of which is connected with the power supply output end of the USB-C, and the first voltage conversion module is used for converting the first voltage output by the power supply output end of the USB-C into a second voltage;
the second control circuit 5 includes:
the first end is connected with the output end of the first voltage conversion module, and the second end is connected with the third resistor R3 of the first control end of the switching chip 2, and the third resistor R3 is used for enabling the first control end of the switching chip 2 to be at a first level when the first end of the third resistor R3 is at a second voltage;
a fourth resistor R4 having a first end connected to the first end of the third resistor R3;
the first end is connected with the fourth resistor R4, the second end is grounded, and the control end is connected with the third switching tube Q3 of the power output end of the Mini DP and used for being conducted when the power output end of the Mini DP outputs a first voltage so that the first end of the switching tube Q3 is a second level;
the first end is connected with the control end of the third switching tube Q3, and the second end is grounded to a fifth resistor R5;
the first end is connected with the first end of the fourth resistor R4, the second end is connected with the power output end of the Mini DP, and the control end is connected with the second switching tube Q2 of the first end of the third switching tube Q3 and used for conducting when the control end of the second switching tube Q2 is at the second level so that the first end of the third resistor R3 is at the second voltage.
The resistance value of the third resistor R3 of the second control circuit 5 in this embodiment may be, but not limited to, 4.7kΩ, the resistance value of the fourth resistor R4 may be, but not limited to, 10kΩ, and the resistance value of the fifth resistor R5 may be, but not limited to, 10kΩ, and may be specifically set according to the actual circuit; the third switching tube Q3 may be, but not limited to, an NMOS (N-Metal-Oxide-Semiconductor), when the third switching tube Q3 is an NMOS, the first level is a high level, the second level is a low level, the first end of the third switching tube Q3 is a drain electrode of the NMOS, the second end is a source electrode of the NMOS, and the control end is a gate electrode of the NMOS; correspondingly, the second switching tube Q2 is a PMOS (P-Metal-Oxide-Semiconductor), the first end of the second switching tube Q2 is a source electrode of the PMOS, the second end is a drain electrode of the PMOS, and the control end is a gate electrode of the PMOS.
Of course, the present embodiment is only one specific example provided according to the circuit configuration in the present application, but the present application is not limited thereto.
As a preferred embodiment, the output terminal of the first voltage conversion module is also connected to the first power supply terminal of the video conversion module 3; the first end of the third resistor R3 is also connected with a first power end of the video conversion module 3;
the signal converter further includes:
the input end is connected with the power output end of the first voltage conversion module, and the output end is connected with the second power end of the video conversion module 3 and is used for converting the second voltage into the third voltage;
the USB-C is also used for supplying power to the video conversion module 3 through the first voltage conversion module and the second voltage conversion module when being connected with the USB-C signal source;
the Mini DP is further configured to supply power to the video conversion module 3 via the second control circuit 5 and the second voltage conversion module when connected to the Mini DP signal source.
The first voltage conversion module and the second voltage conversion module in this embodiment can also convert according to the voltages output by the power output ends of the USB-C and Mini DP, so as to supply power to the video conversion module 3, and ensure the normal operation of the video conversion module 3.
The first voltage may be 5V, the second voltage may be 3.3V, and the third voltage may be DVDD09, which is not limited in the present application, and may be set according to the actual power consumption of the video conversion module 3.
As a preferred embodiment, the power output terminal of the USB-C is further connected to the power input terminal of the display module, and the USB-C is further configured to supply power to the display module when connected to the USB-C signal source;
the signal converter further includes:
the input end is connected with the power output end of the Mini DP, and the output end is connected with the charge pump 6 of the power input end of the display module, which is used for converting the second voltage output by the power output end of the Mini DP into the first voltage, so that the Mini DP supplies power to the display module through the Mini DP when being connected with the signal source of the Mini DP.
In addition, the USB-C and Mini DP can also supply power for the display module, so as to ensure the normal operation of the display module.
It should be noted that, the video conversion module 3 and the display module may be provided with additional power supply units, which may increase a certain cost.
As a preferred embodiment, further comprising:
the input end is connected with the power output end of the USB-C, and the output end is connected with the power input end of the display module and is used for preventing backflow;
the input end is connected with the output end of the charge pump 6, and the output end is connected with the second anti-reverse diode D2 of the power input end of the display module and used for preventing backflow.
In this embodiment, anti-reverse diodes are further disposed between the power output end of the USB-C and the display module, and between the charge pump 6 and the display module, so as to prevent the voltage at the power input end of the display module from flowing backward to the USB-C and Mini DP, thereby ensuring the normal operation of the device.
As a preferred embodiment, the video signal output end of the video conversion module 3 is connected with the video signal input end of the display module, the communication end is connected with the communication end of the display module, the feedback signal input end is connected with the feedback signal output end of the display module, and is specifically used for being in communication connection with the display module when receiving the feedback signal sent by the display module after power is supplied to obtain the parameters of the display module, so that the video signal is converted based on the parameters of the display module, and the parameters are sent to the display module through the video signal output end, so that the display module displays the image corresponding to the video signal.
In this embodiment, after the display module is powered on, a feedback signal is sent to the video conversion module 3, and after the video conversion module 3 receives the feedback signal, parameters of the display module are obtained through the communication end, so that the video signal is converted into a signal corresponding to the parameters of the display module, otherwise, the display module may not normally display an image.
Wherein the display modules may be, but are not limited to, connected via HDMI and video conversion module 3.
The model of the video conversion module 3 may be, but not limited to, ANX7517, and the model of the switch chip 2 may be, but not limited to, TS3DV642.
In fig. 2, charge Pump is a charge Pump 6, and the voltage output by the charge Pump 6 is 5V.
In fig. 2, the HPD (hot plug detection) end is a feedback signal output end, the I2C (Inter-Integrated Circuit) end is a communication end for displaying parameters of the device, and the TMDS (Transition-minimized differential signaling) end is a video signal output end for transmitting video signals.
It should also be noted that in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. The signal converter is characterized by comprising an input end, a switching chip connected with the input end, a video conversion module connected with the switching chip and an output end connected with the video conversion module;
the input end comprises N signal source interfaces connected with different signal sources and is used for receiving video signals sent by the signal sources after being connected with the corresponding signal sources; and only one of the signal source interfaces is connected with the corresponding signal source at a time; n is an integer greater than 1;
the switching chip is used for receiving the video signal sent by the signal source interface after the signal source is connected;
the video conversion module is connected with a display module through the output end and is used for converting the video signal based on the parameters of the display module, and the converted video signal is sent to the display module through the output end by the output end so that the display module displays the image corresponding to the video signal;
n is 2, and the two signal source interfaces are respectively a micro display interface Mini DP and a USB-C;
the USB-C is also used for outputting a first voltage through a power output end of the USB-C signal source after being connected with the USB-C signal source, and the video conversion module is also used for outputting a first level from a control end of the video conversion module after the display module is electrified;
the signal converter further comprises a first voltage conversion module connected with the power output end of the USB-C and used for converting the first voltage output by the power output end of the USB-C into a second voltage;
the first end is connected with the output end of the first voltage conversion module, the second end is connected with the control end of the video conversion module, and the third end is connected with the control signal input end of the Mini DP; after the Mini DP is connected with a Mini DP signal source, and before the display module is powered on, setting the control end of the video conversion module as the second level, and setting the third end of the video conversion module as the first level after the control end of the video conversion module outputs the first level, so that the control signal input end of the Mini DP is set as the first level;
the protocol communication interface of the video conversion module is connected with the protocol communication interface of the USB-C, and is further used for carrying out protocol communication with the USB-C when the level of the control end of the video conversion module is the first level before the display module is electrified, and receiving the video signal transmitted by the USB-C through the switching chip; and before the display module is electrified, when the level of the control end of the display module is the second level, the video signal transmitted by the Mini DP through the switching chip is received.
2. The signal converter of claim 1, wherein the first control circuit comprises:
the first end is a first resistor of the first end of the first control circuit;
the first end is connected with the second end of the first resistor, the second end is connected with the second resistor, the third end is a switch connected with the second end of the first control circuit and the control end of the video conversion module, and the switch is used for connecting the first end of the switch with the third end of the switch when the USB-C is connected with the USB-C signal source based on the setting of a user, namely the control end of the video conversion module is connected with the output end of the first voltage conversion module; when the Mini DP is connected with a signal source of the Mini DP, the second end of the Mini DP is connected with the third end of the Mini DP, namely the control end of the video conversion module is connected with the first end of the second resistor;
the first end is connected with the control signal input end of the Mini DP, and the second end is grounded.
3. The signal converter of claim 1, further comprising a second control circuit;
the power output end of the USB-C is connected with the first control end and the second control end of the switching chip through the second control circuit;
the power output end of the Mini DP is connected with the second control end of the switching chip and is connected with the first control end of the switching chip through the second control circuit;
the USB-C is also used for outputting a first voltage through the power output end of the USB-C signal source after being connected with the USB-C signal source so that the first control end of the switching chip is a first level through the second control circuit and the second control end is a second level;
the Mini DP is also used for outputting a second voltage through a power supply output end of the Mini DP after being connected with a signal source of the Mini DP so that a second control end of the switching chip is the first level, and the first control end of the switching chip is the first level through the second control circuit;
the switching chip is specifically configured to conduct an input terminal connected to the USB-C when a first control terminal of the switching chip is the first level and a second control terminal is the second level, so as to receive the video signal sent by the USB-C; and when the first control end and the second control end of the video signal transmitting device are both the first level, the input end connected with the Mini DP is conducted so as to receive the video signal transmitted by the Mini DP.
4. The signal converter of claim 3, further comprising a first voltage conversion module having an input connected to a power output of the USB-C for converting the first voltage output by the power output of the USB-C to the second voltage;
the second control circuit includes:
the first end is connected with the output end of the first voltage conversion module, and the second end is connected with the third resistor of the first control end of the switching chip and is used for enabling the first control end of the switching chip to be at a first level when the first end of the third resistor is at the second voltage;
a fourth resistor having a first end connected to the first end of the third resistor;
the first end is connected with the fourth resistor, the second end is grounded, and the control end is connected with the power output end of the Mini DP and is used for conducting when the power output end of the Mini DP outputs the first voltage so that the first end of the switch tube is the second level;
the first end is connected with the control end of the third switching tube, and the second end is grounded to a fifth resistor;
the first end is connected with the first end of the fourth resistor, the second end is connected with the power output end of the Mini DP, and the control end is connected with the second switching tube connected with the first end of the third switching tube and used for being conducted when the control end of the second switching tube is the second level so that the first end of the third resistor is the second voltage.
5. The signal converter of claim 4, wherein the output of the first voltage conversion module is further connected to a first power supply terminal of the video conversion module; the first end of the third resistor is also connected with a first power end of the video conversion module;
the signal converter further includes:
the input end is connected with the power output end of the first voltage conversion module, and the output end is connected with the second power end of the video conversion module and is used for converting the second voltage into a third voltage;
the USB-C is also used for supplying power to the video conversion module through the first voltage conversion module and the second voltage conversion module when being connected with the USB-C signal source;
and the Mini DP is also used for supplying power to the video conversion module through the second control circuit and the second voltage conversion module when being connected with the Mini DP signal source.
6. The signal converter of claim 1, wherein the power output of the USB-C is further coupled to the power input of the display module, the USB-C further configured to power the display module when coupled to the USB-C signal source;
the signal converter further includes:
the input end is connected with the power output end of the Mini DP, the output end is connected with the charge pump of the power input end of the display module, and the charge pump is used for converting the second voltage output by the power output end of the Mini DP into the first voltage, so that the Mini DP supplies power to the display module through the Mini DP itself when being connected with the signal source of the Mini DP.
7. The signal converter of claim 6, further comprising:
the input end is connected with the power output end of the USB-C, and the output end is connected with the power input end of the display module and is used for preventing backflow;
the input end is connected with the output end of the charge pump, and the output end is connected with the power input end of the display module and is used for preventing backflow.
8. The signal converter according to claim 6, wherein the video signal output end of the video conversion module is connected to the video signal input end of the display module, the communication end is connected to the communication end of the display module, the feedback signal input end is connected to the feedback signal output end of the display module, and is specifically configured to be communicatively connected to the display module when receiving the feedback signal sent by the display module after power is turned on, so as to obtain the parameters of the display module, so that the video signal is converted based on the parameters of the display module, and the converted video signal is sent to the display module through the video signal output end, so that the display module displays the image corresponding to the video signal.
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