CN113923393A - Signal converter - Google Patents
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- CN113923393A CN113923393A CN202111217438.1A CN202111217438A CN113923393A CN 113923393 A CN113923393 A CN 113923393A CN 202111217438 A CN202111217438 A CN 202111217438A CN 113923393 A CN113923393 A CN 113923393A
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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
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Abstract
The invention 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 the signal source corresponding to the signal source at each time, so that the switching chip receives the video signals sent by the signal source interface connected with the signal source, the video conversion module converts the video signals based on the parameters of the display module, and the display module displays images corresponding to the video signals. Therefore, the signal converter in the application can transmit different video signals received by different signal source interfaces to the video conversion module, when the signal source is changed, the corresponding signal source interface is connected with the signal converter, and the cost is reduced without additionally arranging the signal converter.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a signal converter.
Background
Many signal sources are currently on the market, for example, a USB-C (USB Type-C) signal source and a Mini DP (Mini display Interface) signal source, and a USB-C to HDMI converter or a Mini DP to HDMI converter is required for signal conversion in order to display on a display device having an HDMI (High Definition Multimedia Interface). Obviously, two signal converters need to be prepared when different signal sources are used, that is, the prior art cannot realize the purpose of converting USB-C to HDMI and converting Mini DP to HDMI in the same converter, which results in the complexity of the signal converter and higher use cost.
Disclosure of Invention
The invention aims to provide a signal converter, wherein a switching chip can transmit different video signals received by different signal source interfaces to a video conversion module, when a signal source is changed, the corresponding signal source interface is connected with the signal source interface, a signal converter is not required to be additionally arranged, and the cost is reduced.
In order to solve the technical problem, the invention 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; only one signal source interface is connected with the corresponding signal source at each 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 used for converting the video signals based on the parameters of the display module and transmitting the converted video signals to the display module through the output end so that the display module displays the images corresponding to the video signals.
Preferably, N is 2, and the two signal source interfaces are respectively a Mini display interface DP and a USB-C.
Preferably, the USB-C is further configured to output a first voltage through a power output terminal of the USB-C after being connected to the USB-C signal source, and the video conversion module is further configured to output a first level from a control terminal of the display module after being powered on;
the signal converter also 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 control circuit is used for setting the control end of the video conversion module to be the first level and setting the third end of the first control circuit to be the second level after the USB-C is connected with a USB-C signal source so as to set the control signal input end of the Mini DP to be the second level; 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 to be the second level, and setting the third end of the video conversion module to be 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 to be 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 powered on, and receiving the video signal transmitted by the USB-C through the switching chip; and before the display module is powered on, receiving the video signal transmitted by the Mini DP through the switching chip when the level of the control end of the display module is the second level. 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 of the first control circuit is connected with the second end of the first resistor, the second end of the first control circuit is connected with the second resistor, the third end of the first control circuit is a switch for connecting the second end of the first control circuit with the control end of the video conversion module, and the first end of the first control circuit and the third end of the video conversion module are connected 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 the 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;
and the second resistor is connected with the control signal input end of the Mini DP at the first end and the ground at the second end. Preferably, a second control circuit is further 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 supply 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 a power output end of the USB-C after being connected with a USB-C signal source, so that a first control end of the switching chip is enabled to be at a first level through the second control circuit, and a second control end of the switching chip is enabled to be at a second level;
the Mini DP is also used for outputting a second voltage through a power output end of the Mini DP after being connected with a Mini DP signal source so as to enable a second control end of the switching chip to be the first level, and enabling the first control end of the switching chip to be the first level through the second control circuit;
the switching chip is specifically configured to switch on an input end connected to the USB-C when a first control end of the switching chip is at the first level and a second control end of the switching chip is at 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 controller 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.
Preferably, the power supply further comprises a first voltage conversion module, an input end of which is connected to the power output end of the USB-C, and the first voltage conversion module is used for converting the first voltage output by the power output end of the USB-C into the second voltage;
the second control circuit includes:
the third resistor 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 third switching tube is used for conducting when the power output end of the Mini DP outputs the first voltage so as to enable the first end of the third switching tube to be the second level;
the first end of the fifth resistor is connected with the control end of the third switching tube, and the second end of the fifth resistor is grounded;
and the second switching tube is used for conducting when the control end of the second switching tube is at the second level so as to enable the first end of the third resistor to be at the second voltage.
Preferably, the output end of the first voltage conversion module is further 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 supply end of the video conversion module;
the signal converter further includes:
the input end of the second voltage conversion module is connected with the power supply output end of the first voltage conversion module, and the output end of the second voltage conversion module is connected with the second power supply 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;
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 further connected to the power input end 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 charge pump is used for converting the second voltage output by the power output end of the Mini DP into the first voltage so as to supply power to the display module through the Mini DP when the Mini DP is connected with the Mini DP signal source.
Preferably, the method further comprises the following steps:
the input end of the first anti-reverse diode is connected with the power output end of the USB-C, and the output end of the first anti-reverse diode is connected with the power input end of the display module and used for preventing reverse flow;
and the second anti-reverse diode is used for preventing reverse flow, and the input end of the second anti-reverse diode is connected with the output end of the charge pump, and the output end of the second anti-reverse diode is connected with the power input end of the display module.
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 conversion module is specifically used for being in communication connection with the display module when receiving the feedback signal sent after the display module is powered on, so as to obtain the parameters of the display module, thereby converting the video signal based on the parameters of the display module, and sending the converted video signal to the display module through the video signal output end, so that the display module displays the image 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 the signal source corresponding to the signal source at each time, so that the switching chip receives the video signals sent by the signal source interface connected with the signal source, the video conversion module converts the video signals based on the parameters of the display module, and the display module displays images corresponding to the video signals. Therefore, the signal converter in the application can transmit different video signals received by different signal source interfaces to the video conversion module, when the signal source is changed, the corresponding signal source interface is connected with the signal converter, and the cost is reduced without additionally arranging the signal converter.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed in the prior art and the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a signal converter according to the present invention;
fig. 2 is a schematic structural diagram of a signal converter according to the present invention.
Detailed Description
The core of the invention is to provide a signal converter, a switching chip can transmit different video signals received by different signal source interfaces to a video conversion module, when a signal source is changed, the corresponding signal source interface is connected with the signal source interface, and a signal converter is not needed to be additionally arranged, so that the cost is reduced.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a signal converter according to the present invention, 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; only one signal source interface 1 is connected with the corresponding signal source each time; n is an integer greater than 1;
the input ends of the switching chip 2 are respectively connected with the signal source interfaces 1 in a one-to-one correspondence manner and are used for receiving video signals sent by the signal source interfaces 1 connected with the signal sources;
the video conversion module 3 is connected with the display module through an output end and used for converting the video signals based on the parameters of the display module and sending the converted video signals 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 only be connected with one signal source generally, so as to convert the video signal of the signal source, and the display module displays the image corresponding to the video signal, for example, the USB-C signal converter can only be connected with 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 the video signal sent by the Mini DP signal source is converted; when the signal source is switched from the USB-C signal source to the Mini DP signal source, the USB-C signal converter connected to the display module needs to be unplugged first and then connected to the Mini DP signal converter in the prior art, which is tedious to operate, and when the number of signal sources is more, the number of converters to be prepared is also more, and the cost is increased accordingly.
In order to solve the above technical problem, 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 to a different signal source, that is, the signal converter is a multi-input single-output signal converter, when a signal source needs to be switched, the signal source interface 1 connected to the signal source before switching is disconnected, the signal source interface 1 corresponding to the signal source to be switched is connected to the signal source, the switching chip 2 switches from receiving a video signal sent by the signal source before switching to receiving a video signal sent by the signal source after switching, so as to realize switching of the signal source, and then, the video conversion module 3 converts the video signal, so that the display module displays an image corresponding to the video signal.
It is thus clear that this application need not to be equipped with a plurality of signal converters, but only need prepare the signal converter in this application, can realize the video signal's of a plurality of signal sources receipt and demonstration, and only switch over the different signal sources of connection at every turn can, need not to carry out the plug to the port of display module, when saving the cost, the simplified operation, has prolonged display module's life.
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 a signal source is changed, the corresponding signal source interface 1 is connected to the signal source interface, so that it is not necessary to additionally provide a signal converter, thereby reducing the cost.
On the basis of the above-described embodiment:
referring to fig. 2, fig. 2 is a schematic structural diagram of a signal converter according to the present invention.
In this embodiment, two signal source interfaces 1 are taken as an example, 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.
As shown in fig. 2, after the USB-C is connected to the USB-C signal source, the USB-C transmits the video signal through four sets of DP1 channels, and receives the parameters of the display device through the AUX channel; after being connected with a Mini DP signal source, the Mini DP transmits video signals through four groups of DP2 channels, and receives parameters of a display device through an AUX channel; between switching chip 2 and video conversion module 3, transmit display device's parameter through the AUXP passageway, transmit video signal through four groups DP3 passageways.
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 also 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 control circuit 4 is used for setting the control end of the video conversion module 3 to be a first level after the USB-C is connected with the USB-C signal source, and setting the third end of the control circuit to be a second level so as to set the control signal input end of the Mini DP to be the second level; after the Mini DP is connected with the Mini DP signal source and before the display module is powered on, setting the control end of the video conversion module 3 to be the second level, and after the control end of the video conversion module 3 outputs the first level, setting the third end of the video conversion module to be the first level so as to set the control signal input end of the Mini DP 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 powered on, and receiving a video signal transmitted by the USB-C through the switching chip; and before the display module is powered on, the video signal transmitted by the Mini DP through the switching chip is received when the level of the control end of the display module is the second level. In this embodiment, the USB-C 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, and 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 the second voltage, at the moment, the second end of the first control circuit 4 is set to be the first level, therefore, the level of the control end of the power-on front video conversion module of the display device is set to be the first level, at the moment, the video conversion module 3 can carry out protocol communication with the USB-C to receive the video signal sent by the USB-C through the switching chip 2, and at the moment, the video conversion module 3 only receives the video signal sent by the USB-C because the control end of the power-on front video conversion module 3 of the display device is the first level; if the Mini DP is connected to the Mini DP signal source, before the display device is powered on, the level of the control end of the video conversion module 3 is set to be the second level, after the display device is powered on, the second end of the first control circuit 4 is set to be the first level, the level of the control signal input end of the Mini DP is set to be the first level, 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 then transmits the video signal to the display module, and the display module displays the corresponding video.
The first voltage may be set to be 5V, the second voltage may be 3.3V, the first level is a high level, and the second level is a low level.
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 the Mini DP is HOT _ PLUG, the control end of the video conversion module 3 is GPIO3, the first control end of the switch chip 2 is SEL1, the second control end is SEL2, the DC TO DC with 5V input in fig. 2 is the first voltage conversion module, and the DC TO DC with DVDD09 output is the second voltage conversion module.
In addition, when the video signal is sent to the video conversion module 3 by either the USB-C or the Mini DP, 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 terminal as a first terminal of the first control circuit 4;
the first end of the first control circuit 4 is connected with the second end of the first resistor R1, the second end of the first control circuit is connected with the second resistor, the third end of the first control circuit is a switch K which is used for connecting the first end of the first control circuit with the third end of the first control circuit 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 the 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;
and the first end of the second resistor is connected with the control signal input end of the Mini DP, and the second end of the second resistor is grounded. .
The first control circuit 4 in this embodiment includes a first resistor R1, a switch K, and a second resistor R2, wherein the resistance of the first resistor R1 may be, but is not limited to, 10K Ω, for example, the first resistor may be set to 4.7K Ω, or 20K Ω, or 100K Ω; the resistance of the second resistor R2 may be, but is not limited to, 10K Ω, for example, the second resistance may be set to 4.7K Ω, or 20K Ω, or 100K Ω, which may be set according to the actual circuit.
It should be noted that, when the switch K in fig. 2 is in the first position, the control terminal of the video conversion module 3, that is, the level of the GPIO3 is high level, and the video conversion module 3 is in the USB-C TO HDMI mode; when the switch K is at the second position, the control terminal of the video conversion module 3, that is, the level of the GPIO3 is low, and the video conversion module 3 is in the Mini DP TO HDMI mode.
As a preferred embodiment, a second control circuit 5;
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 a second control circuit 5;
the power supply 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 a second control circuit 5;
the USB-C is also used for outputting a first voltage through a power output end of the USB-C after being connected with a USB-C signal source, so that a first control end of the switching chip 2 is enabled to be a first level through the second control circuit 5, and a second control end of the switching chip is enabled to be a second level;
the Mini DP is further configured to output a second voltage through a power output terminal of the Mini DP signal source after being connected to the Mini DP signal source, so that the second control terminal of the switching chip 2 is at the first level, and the first control terminal of the switching chip 2 is at the first level through the second control circuit 5;
the switching chip 2 is specifically configured to switch on an input end connected to the USB-C when a first control end of the switching chip is at a first level and a second control end of the switching chip 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 controller are both at the first level, the input end connected with the Mini DP is conducted to receive the video signal sent by the Mini DP.
In this embodiment, the USB-C is connected to a USB-C signal source, when the Mini DP is not connected to the Mini DP signal source, the power output terminal of the USB-C outputs a first voltage, the power output terminal of the Mini DP does not output a voltage, at this time, the second control circuit 5 may 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 and the USB-C are turned on, the switching chip 2 receives a 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 a corresponding video.
And when the USB-C is not connected with the USB-C signal source and the Mini DP is connected with the Mini DP signal source, the power output end of the USB-C cannot output voltage, the power output end of the Mini DP outputs a second voltage, at the moment, the second control circuit 5 enables the first control end of the switching chip 2 to be at a first level and the second control end to be at a second level, at the moment, the switching chip 2 is conducted with the Mini DP, 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 by the power output ends of the USB-C and the 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 implementing the switching of the signal source.
As a preferred embodiment, the device further comprises a first voltage conversion module, an input end of which is connected to the power output end of the USB-C, and the first voltage conversion module is used for converting the first voltage output by the power output end of the USB-C into a second voltage;
the second control circuit 5 includes:
a third resistor R3 having a first end connected to the output end of the first voltage conversion module and a second end connected to the first control end of the switching chip 2, for making the first control end of the switching chip 2 be at the first level when the first end of the third resistor R3 is at the second voltage;
a fourth resistor R4 having a first end connected to a first end of the third resistor R3;
the third switching tube Q3 is used for conducting when the power output end of the Mini DP outputs a first voltage so as to enable the first end of the third switching tube Q3 to be at a second level;
a fifth resistor R5, the first end of which is connected with the control end of the third switching tube Q3, and the second end of which is grounded;
the second switch Q2, which has a first end connected to the first end of the fourth resistor R4, a second end connected to the power output end of the Mini DP, and a control end connected to the first end of the third switch Q3, is configured to be turned on when the control end of the second switch Q2 is at the second level, so that the first end of the third resistor R3 is at the second voltage.
In this embodiment, the resistance of the third resistor R3 of the second control circuit 5 may be, but is not limited to, 4.7K Ω, the resistance of the fourth resistor R4 may be, but is not limited to, 10K Ω, the resistance of the fifth resistor R5 may be, but is not limited to, 10K Ω, and may be specifically set according to an actual circuit; the third switch tube Q3 may be, but is not limited to, an NMOS (N-Metal-Oxide-Semiconductor), when the third switch 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 switch tube Q3 is a drain of the NMOS, the second end is a source of the NMOS, and the control end is a gate of the NMOS; correspondingly, the second switch Q2 is a PMOS (P-Metal-Oxide-Semiconductor), the first end of the second switch Q2 is a source of the PMOS, the second end is a drain of the PMOS, and the control end is a gate of the PMOS.
Of course, this embodiment is only a specific example provided according to the circuit structure in the present application, but the present application does not limit this.
As a preferred embodiment, the output terminal of the first voltage conversion module is further connected to the first power terminal of the video conversion module 3; the first end of the third resistor R3 is also connected to the first power supply terminal of the video conversion module 3;
the signal converter further includes:
the second voltage conversion module is used for converting the second voltage into a third voltage, and the input end of the second voltage conversion module is connected with the power output end of the first voltage conversion module;
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 through 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 perform conversion according to the voltage output by the power output terminals of the USB-C and the Mini DP to supply power to the video conversion module 3, thereby ensuring 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 this application and may be set according to the actual power consumption of the video conversion module 3.
As a preferred embodiment, the power output end of the USB-C is further connected to the power input end 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 charge pump 6 is used for converting a second voltage output by the power output end of the Mini DP into a first voltage so as to supply power to the display module through the Mini DP when the Mini DP is connected with the Mini DP signal source.
In addition, the USB-C and the Mini DP can also supply power to the display module to ensure the normal work of the display module.
It should be noted that, both the video conversion module 3 and the display module may be provided with additional power supply units, which may increase the cost.
As a preferred embodiment, the method further comprises the following steps:
the input end of the first anti-reverse diode D1 is connected with the power output end of the USB-C, and the output end of the first anti-reverse diode D1 is connected with the power input end of the display module and is used for preventing reverse flow;
and the second anti-reverse diode D2 with the input end connected with the output end of the charge pump 6 and the output end connected with the power input end of the display module is used for preventing reverse flow.
In the embodiment, anti-reverse diodes are arranged between the power output end of the USB-C and the display module and between the charge pump 6 and the display module, and are used for preventing the voltage of the power input end of the display module from flowing backwards to the USB-C and the Mini DP and ensuring the normal operation of the device.
As a preferred embodiment, the video signal output end of the video conversion module 3 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 the video conversion module is specifically configured to be in communication connection with the display module when receiving a feedback signal sent after the display module is powered on, so as to obtain parameters of the display module, thereby converting the video signal based on the parameters of the display module, and sending the video signal to the display module through the video signal output end, so that the display module displays an 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 the video conversion module 3 obtains the parameter of the display module through the communication terminal after receiving the feedback signal, so as to convert the video signal into a signal corresponding to the parameter of the display module, otherwise, the display module may not normally display an image.
Wherein, the display module can be connected with the video conversion module 3 through the HDMI, but is not limited thereto.
The model of the video conversion module 3 may be, but is not limited to, ANX7517, and the model of the switching chip 2 may be, but is not limited to, TS3DV 642.
The charge Pump in fig. 2 is the charge Pump 6, and the voltage output by the charge Pump 6 is 5V.
In fig. 2, an HPD (hot plug detect) terminal is a feedback signal output terminal, I2C (Inter-Integrated Circuit) is a communication terminal for displaying parameters of the apparatus, and TMDS (Transition-minimized differential signaling) is a video signal output terminal for transmitting a video signal, which is not limited in this application.
It is further noted that, in the present 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. Also, 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 an … …" does not exclude the presence of other identical 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 invention. 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 invention. Thus, the present invention 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 (10)
1. A 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; only one signal source interface is connected with the corresponding signal source at each 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 used for converting the video signals based on the parameters of the display module and transmitting the converted video signals to the display module through the output end so that the display module displays the images corresponding to the video signals.
2. The signal converter according to claim 1, wherein N is 2, and the two signal source interfaces are a micro display interface Mini DP and a USB-C, respectively.
3. The signal converter of claim 2, wherein 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 is further configured to output a first level from its own control terminal after the display module is powered on;
the signal converter also 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 control circuit is used for setting the control end of the video conversion module to be the first level and setting the third end of the first control circuit to be the second level after the USB-C is connected with a USB-C signal source so as to set the control signal input end of the Mini DP to be the second level; 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 to be the second level, and setting the third end of the video conversion module to be 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 to be 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 powered on, and receiving the video signal transmitted by the USB-C through the switching chip; and before the display module is powered on, receiving the video signal transmitted by the Mini DP through the switching chip when the level of the control end of the display module is the second level.
4. The signal converter of claim 3, 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 of the first control circuit is connected with the second end of the first resistor, the second end of the first control circuit is connected with the second resistor, the third end of the first control circuit is a switch for connecting the second end of the first control circuit with the control end of the video conversion module, and the first end of the first control circuit and the third end of the video conversion module are connected 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 the 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;
and the second resistor is connected with the control signal input end of the Mini DP at the first end and the ground at the second end.
5. The signal converter of claim 2, 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 supply 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 a power output end of the USB-C after being connected with a USB-C signal source, so that a first control end of the switching chip is enabled to be at a first level through the second control circuit, and a second control end of the switching chip is enabled to be at a second level;
the Mini DP is also used for outputting a second voltage through a power output end of the Mini DP after being connected with a Mini DP signal source so as to enable a second control end of the switching chip to be the first level, and enabling the first control end of the switching chip to be the first level through the second control circuit;
the switching chip is specifically configured to switch on an input end connected to the USB-C when a first control end of the switching chip is at the first level and a second control end of the switching chip is at 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 controller 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.
6. The signal converter according to claim 5, further comprising a first voltage conversion module having an input terminal connected to the power output terminal of the USB-C, for converting the first voltage outputted from the power output terminal of the USB-C into the second voltage;
the second control circuit includes:
the third resistor 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 third switching tube is used for conducting when the power output end of the Mini DP outputs the first voltage so as to enable the first end of the third switching tube to be the second level;
the first end of the fifth resistor is connected with the control end of the third switching tube, and the second end of the fifth resistor is grounded;
and the second switching tube is used for conducting when the control end of the second switching tube is at the second level so as to enable the first end of the third resistor to be at the second voltage.
7. The signal converter according to claim 6, wherein the output terminal of the first voltage converting module is further connected to a first power terminal of the video converting module; the first end of the third resistor is also connected with a first power supply end of the video conversion module;
the signal converter further includes:
the input end of the second voltage conversion module is connected with the power supply output end of the first voltage conversion module, and the output end of the second voltage conversion module is connected with the second power supply 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;
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.
8. The signal converter of claim 3, wherein the power output of the USB-C is further coupled to a power input of the display module, the USB-C further configured to provide power to the display module when coupled to the USB-C signal source;
the signal converter further includes:
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 as to supply power to the display module through the Mini DP when the Mini DP is connected with the Mini DP signal source.
9. The signal converter of claim 8, further comprising:
the input end of the first anti-reverse diode is connected with the power output end of the USB-C, and the output end of the first anti-reverse diode is connected with the power input end of the display module and used for preventing reverse flow;
and the second anti-reverse diode is used for preventing reverse flow, and the input end of the second anti-reverse diode is connected with the output end of the charge pump, and the output end of the second anti-reverse diode is connected with the power input end of the display module.
10. The signal converter according to claim 8, wherein a video signal output terminal of the video conversion module is connected to a video signal input terminal of the display module, a communication terminal is connected to a communication terminal of the display module, and a feedback signal input terminal is connected to a feedback signal output terminal of the display module, and is specifically configured to be in communication with the display module when receiving a feedback signal sent after the display module is powered on, so as to obtain a parameter of the display module, so that the video signal is converted based on the parameter of the display module and sent to the display module through the video signal output terminal, so that the display module displays an image corresponding to the video signal.
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