TWM628362U - Signal conversion circuit, electronic device and electronic system - Google Patents

Abstract

The present invention discloses a signal conversion circuit, an electronic device and an electronic system. The signal conversion circuit includes: a power input end, a first power output end, a signal input end to be converted, a target signal output end, a data transmission end, a power conversion module, an anti-current backflow module, a signal conversion module and Resistive element, wherein, the anti-current backflow module is arranged on the path connecting the first power input end, the power conversion module, the resistive element and the data transmission end; When the voltage is high, prevent the current from flowing back to the power input terminal. The technical means provided by this creation can prevent the power supply of the playback device from flowing back into the signal source through the converter, resulting in the situation that the playback device cannot be played.

Description

Signal conversion circuits, electronic devices and electronic systems

The present invention relates to the field of electronic technology, in particular to a signal conversion circuit, an electronic device and an electronic system.

At least one type of data interface may be provided on playback devices such as displays, audio, and multimedia devices, such as: High Definition Multimedia Interface (HDMI), Video Graphics Array (VGA) interface, Universal String Column bus (Universal Serial Bus, referred to as USB) interface and so on.

If the data interface set on the signal source is different from the data interface type of the display, audio, multimedia equipment and other playback equipment, the signal source can be connected to the display, audio, multimedia equipment and other playback equipment through the converter to achieve normal signal transmission.

Embodiments of the present invention provide a signal conversion circuit, an electronic device and an electronic system, so as to solve the problem that after the signal source is turned off, when the playback device is not turned off, the power of the playback device generates current through the converter to flow back into the signal source, that is, leakage to the signal source, where When the signal source is restarted or woken up from sleep, the signal source enters a protection state due to the voltage detection mechanism of the signal source, which prohibits the signal source from outputting the power supply voltage and the signal to be played, resulting in the problem that the playback device cannot play normally.

In the first aspect, this creative embodiment provides a signal conversion circuit, including: a power input terminal, a first power output terminal, a signal input terminal to be converted, a target signal output terminal, a data transmission terminal, a power conversion module, and an anti-current backflow mode. groups, signal conversion modules and resistive elements, Wherein, the input end of the power conversion module is electrically connected with the power input end; the output end of the power conversion module is electrically connected with the first power output end; The output end of the power conversion module is electrically connected with the data transmission end through the resistive element; The signal conversion module is electrically connected with the input end of the signal to be converted, the output end of the target signal and the data transmission end; The anti-current backflow module is arranged on the path connecting the power input terminal, the power conversion module, the resistive element and the data transmission terminal; the anti-current backflow module is used to prevent the current from backflowing to the power supply when the power supply input terminal does not input the power supply voltage input.

Further, the signal conversion module includes: a universal serial bus USB signal to high-definition multimedia interface HDMI signal conversion module or a universal serial bus USB signal to a video graphics array VGA signal conversion module.

Further, the data transmission end includes a clock signal transmission end and a control signal transmission end, the resistive element includes a first resistive element and a second resistive element; the output end of the power conversion module is transmitted through the first resistive element and the clock signal The terminal is electrically connected; the output terminal of the power conversion module is electrically connected with the control signal transmission terminal through the second resistive element; the signal conversion module is electrically connected with the input terminal of the signal to be converted, the target signal output terminal, the clock signal transmission terminal and the control signal transmission terminal Electrical connection; the anti-current backflow module is arranged on the path connecting the power input end, the power conversion module, the first resistive element, the second resistive element, the clock signal transmission end and the control signal transmission end.

Further, the anti-current backflow module includes a diode; The power input terminal is electrically connected to the anode of the diode; the cathode of the diode is electrically connected to the first power output terminal; the cathode of the diode is electrically connected to the clock signal transmission terminal through the first resistive element; The second resistive element is electrically connected with the control signal transmission end.

Further, the output end of the power conversion module is electrically connected to the anode of the diode; or the cathode of the diode is electrically connected to the input end of the power conversion module.

Further, the signal conversion circuit further includes a first data interface, and the first power output terminal, the target signal output terminal and the data transmission terminal are arranged in the first data interface.

Further, the signal conversion circuit further includes a second data interface, and the power input end and the input end of the signal to be converted are disposed in the second data interface.

In the second aspect, an embodiment of the present invention also provides an electronic device, including the signal conversion circuit and a signal source provided in any embodiment of the present invention; the signal source includes a second power output end and a playback signal output end, and the second power output end and The power input terminal is electrically connected; the playback signal output terminal is electrically connected with the input terminal of the signal to be converted.

Further, the electronic device further includes: a voltage detection module; the voltage detection module is electrically connected to the second power output end of the signal source; the voltage detection module is used when the signal source is switched from a non-operational state to an operational state , when it is detected that the voltage on the second power output terminal of the signal source exceeds the preset voltage, the signal source is prohibited from outputting the power supply voltage and the signal to be played.

In a third aspect, an embodiment of the present invention also provides an electronic system, including a playback device and the electronic device provided in any embodiment of the present invention. The playback device is electrically connected to the first power output end, the target signal output end and the data transmission end.

Further, the playback device includes a display, and the display is provided with a second power supply and a memory, wherein the second power supply is electrically connected to the memory; the memory is electrically connected to the data transmission end; the memory is used to store the resolution information of the display; the signal The source is used to output a signal that matches the resolution information of the display.

In the technical means of this creative embodiment, the signal conversion circuit includes: a power input terminal, a first power output terminal, a signal input terminal to be converted, a target signal output terminal, a data transmission terminal, a power conversion module, an anti-current backflow module, A signal conversion module and a resistive element, wherein the input end of the power conversion module is electrically connected with the power input end; the output end of the power conversion module is electrically connected with the first power output end; the output end of the power conversion module is electrically connected through a resistance The resistive element is electrically connected to the data transmission end; the signal conversion module is electrically connected to the input end of the signal to be converted, the target signal output end and the data transmission end; , on the path connected to the data transmission terminal; the anti-current backflow module is used to prevent the current from backflowing to the power input terminal when the power input terminal does not input the power supply voltage, so as to solve the problem that the playback device is not turned off after the signal source is turned off. The power leaks to the signal source through the converter. When the signal source is restarted or woken up from sleep, the signal source enters the protection state due to the voltage detection mechanism of the signal source, and the signal source is prohibited from outputting the power supply voltage and the signal to be played. The device cannot play the problem.

The present creation will be further described in detail below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, the drawings only show some but not all structures related to the present invention.

This inventive embodiment provides a signal conversion circuit. FIG. 1 is a schematic structural diagram of a signal conversion circuit according to an embodiment of the present invention. FIG. 2 is a schematic diagram of an application scenario of a signal conversion circuit provided by an embodiment of the present invention. The signal conversion circuit 100 includes: a power input terminal Vi, a first power output terminal Vo, a signal input terminal DP to be converted, a target signal output terminal So, a data transmission terminal, a power conversion module 1, an anti-current backflow module 3, a signal Conversion module 2 and resistive element.

The input end of the power conversion module 1 is electrically connected to the power input end Vi; the output end of the power conversion module 1 is electrically connected to the first power output end Vo.

The output end of the power conversion module 1 is electrically connected to the data transmission end through a resistive element.

The signal conversion module 2 is electrically connected with the input terminal DP of the signal to be converted, the output terminal So of the target signal and the data transmission terminal.

The anti-current backflow module 3 is arranged on the path where the power input terminal Vi, the power conversion module 1, the resistive element and the data transmission terminal are connected; Prevent current from flowing back to the power input terminal Vi. For example, when the power input terminal Vi does not input the power supply voltage, a small amount of current from the data transmission terminal may be backflowed to the power input terminal Vi through the resistive element. Dependent on the current of the element.

In some embodiments, the data transmission end includes a clock signal transmission end SCL and a control signal transmission end SDA. The number of data transmission ends may be one or more, which may be set as required, which is not limited in this creative embodiment. The number of resistive elements may be one or more, and may be set as required, which is not limited in this embodiment of the present invention. The resistive elements include a first resistive element R1 and a second resistive element R2. The output end of the power conversion module 1 is electrically connected to the clock signal transmission end SCL through the first resistive element R1; the output end of the power conversion module 1 is electrically connected to the control signal transmission end SDA through the second resistive element R2. The signal conversion module 2 is electrically connected with the input terminal DP of the signal to be converted, the output terminal So of the target signal, the clock signal transmission terminal SCL and the control signal transmission terminal SDA. The anti-current backflow module 3 is disposed on the path connecting the power input end Vi, the power conversion module 1, the first resistive element R1, the second resistive element R2, the clock signal transmission end SCL and the control signal transmission end SDA.

The power input terminal Vi can be used for receiving the power voltage output by the signal source 4 . The to-be-converted signal input terminal DP can be used to receive at least one type of to-be-played signal output from the signal source 4 , such as video and audio. The power conversion module 1 can be used to convert the voltage of the signal source 4 into a power supply voltage that conforms to HDMI or VGA standards. The signal conversion module 2 can be used to convert the DP (Display Port) signal (ie, the signal to be played) output by the signal source 4 into a signal conforming to HDMI or VGA and other standards. Optionally, the signal conversion module 2 includes: a universal serial bus USB signal to high-definition multimedia interface HDMI signal conversion module or a universal serial bus USB signal to a video graphics array VGA signal conversion module. If the signal conversion module 2 is a universal serial bus USB signal to high-definition multimedia interface HDMI signal conversion module, the target signal output terminal So can output the HDMI signal. If the signal conversion module 2 is a universal serial bus USB signal-to-video graphics array VGA signal conversion module, the target signal output terminal So can output a VGA signal. The first resistive element R1 and the second resistive element R2 may be pull-up resistors. The anti-current backflow module 3 may include switches such as switch tubes, relays, etc., and a control module for controlling the on or off of the switches, and the like. FIG. 1 exemplarily shows a situation in which the current backflow prevention module 3 is disposed between the output end of the power conversion module 1 and the first resistive element R1 and the second resistive element R2 . The power conversion module 1 may include a step-up power conversion module or a step-down power conversion module.

When the playback device 200 needs to play, the signal source 4 will output the power supply voltage to the power input terminal Vi, the signal source 4 will output the DP signal to the input terminal DP of the signal to be converted, and the anti-current backflow module 3 will be turned on, so that the power conversion The voltage converted by the module 1 conforming to the preset standard and the signal conforming to the preset standard converted by the signal conversion module 2 are output to the playback device 200 , so that the playback device 200 can play, for example, a display to display a picture. The signal source 4 may include a host and the like. The playback device 200 may include at least one of the following: a display, an audio and a multimedia device, and the like.

When the signal source 4 is turned off or enters the sleep state, and the playback device 200 is not powered off, the signal source 4 does not output the power supply voltage to the power input terminal Vi, and the signal source 4 does not output the DP signal to the input terminal DP of the signal to be converted, preventing current The backflow module 3 will be turned off, so that the voltage on the power supply of the playback device 200 will not be backflowed into the signal source 4 through the first resistance element R1, the second resistance element R2 and the power conversion module 1, etc., as shown in FIG. 3 . FIG. 3 is a schematic diagram of an anti-current backflow module provided in an embodiment of the present invention when it works, and the anti-current backflow module 3 will block the paths of backflow of currents I ₁ and I ₂ . When the signal source 4 is restarted or wakes up from sleep, the currents I ₁ and I ₂ cannot be reversed to the signal source 4, and the protection mechanism of the signal source 4 will not be triggered, so that the signal source 4 can normally output the power supply voltage to the power input terminal Vi, output the DP signal to the input terminal DP of the signal to be converted, so that the anti-current backflow module 3 is turned on again, so that the voltage converted by the power conversion module 1 conforms to the preset standard and the voltage converted by the signal conversion module 2 conforms to the The preset standard signal is output to the playback device 200 so that the playback device 200 can play.

In the technical means of this embodiment, the signal conversion circuit includes: a power input end, a first power output end, a signal input end to be converted, a target signal output end, a data transmission end, a power conversion module, an anti-current backflow module, a signal A conversion module and a resistive element, wherein the input end of the power conversion module is electrically connected with the power input end; the output end of the power conversion module is electrically connected with the first power output end; the output end of the power conversion module is electrically connected through a resistive The element is electrically connected to the data transmission end; the signal conversion module is electrically connected to the input end of the signal to be converted, the target signal output end and the data transmission end; On the path connected to the data transmission terminal; the anti-current backflow module is used to prevent the current from backflowing to the power input terminal when the power input terminal does not input the power supply voltage, so as to solve the problem of the power supply of the playback device when the playback device is not turned off after the signal source is turned off. The converter leaks electricity to the input signal source. When the signal source is restarted or woken up from sleep, the signal source enters the protection state due to the voltage detection mechanism of the signal source, and the signal source is prohibited from outputting the power supply voltage and the signal to be played. The device cannot play the problem.

Optionally, on the basis of the foregoing embodiment, referring to FIG. 1 , the current backflow prevention module 3 includes a diode D1 .

The power input terminal Vi is electrically connected to the anode of the diode D1; the cathode of the diode D1 is electrically connected to the first power output terminal Vo; the cathode of the diode D1 is electrically connected to the clock signal transmission terminal through the first resistive element R1 SCL is electrically connected; the cathode of the diode D1 is electrically connected to the control signal transmission end SDA through the second resistive element R2. That is, the diode D1 is disposed on the path connecting the power input end Vi to the end connected between the first resistive element R1 and the second resistive element R2 and the output end of the power conversion module 1 . The power input end Vi is electrically connected to the first power output end Vo via the diode D1 and the power conversion module 1; the power input end Vi is connected to the clock signal via the diode D1, the power conversion module 1 and the first resistive element R1 The transmission end SCL is electrically connected; the power input end Vi is electrically connected to the control signal transmission end SDA through the diode D1, the power conversion module 1 and the second resistive element R2. The conduction direction of the diode D1 can be directed to the data transmission end along the power input end Vi. The positions of the diode D1 and the power conversion module 1 can be exchanged, and the diode D1 can be located before or after the power conversion module 1 . In some embodiments, as shown in FIG. 1 , the output end of the power conversion module 1 is electrically connected to the anode of the diode D1 . That is, the diode D1 is disposed on the path connecting the output end of the power conversion module 1 to the end connecting the first resistive element R1 and the second resistive element R2 to the output end of the power conversion module 1 . In some embodiments, as shown in FIG. 4 , the cathode of the diode D1 is electrically connected to the input end of the power conversion module 1 , and the cathode of the diode D1 is electrically connected to the first resistive element R1 through the power conversion module 1 . The clock signal transmission terminal SCL is connected, and the cathode of the diode D1 is electrically connected to the control signal transmission terminal SDA through the power conversion module 1 and the second resistive element R2. That is, the diode D1 is disposed on the path connecting between the power input end Vi and the input end of the power conversion module 1 .

Among them, when the signal source 4 is turned off or in a non-operating state such as a sleep state, and the playback device 200 is not powered off, the diode D1 is turned off, that is, reversely turned off, to prevent the currents I ₁ and I ₂ from being backflowed to the signal source. 4. When the signal source 4 outputs the power supply voltage and the signal to be played, the diode D1 conducts forwardly, so that the voltage converted by the power conversion module 1 conforms to the preset standard and the voltage converted by the signal conversion module 2 conforms to the preset The standard signal is output to the playback device 200 so that the playback device 200 can play.

Optionally, on the basis of the above-mentioned embodiment, FIG. 4 is a schematic structural diagram of another signal conversion circuit provided in this creative embodiment. electrical connection. Optionally, the current backflow prevention module 3 includes a diode D1 , the power input end Vi is electrically connected to the anode of the diode D1 ; the cathode of the diode D1 is electrically connected to the input end of the power conversion module 1 .

4 , when the signal source 4 is turned off or in a non-operating state such as a sleep state, and the playback device 200 is not powered off, the diode D1 is turned off to prevent the currents I ₁ and I ₂ from being backflowed to the signal source 4 . When the signal source 4 outputs the power supply voltage and the signal to be played, the diode D1 is turned on, so that the voltage converted by the power conversion module 1 conforms to the preset standard and the voltage converted by the signal conversion module 2 conforms to the preset standard. The signal is output to the playback device 200, so that the playback device 200 plays.

Optionally, on the basis of the above-mentioned embodiment, FIG. 5 is a schematic structural diagram of another signal conversion circuit provided in this creative embodiment. The output end of the power conversion module 1 is electrically connected to the anode of the diode D1; the power conversion The output terminal of the module 1 is electrically connected to the first power output terminal Vo; the cathode of the diode D1 is electrically connected to the clock signal transmission terminal SCL through the first resistive element R1; the cathode of the diode D1 is electrically connected to the clock signal transmission terminal SCL through the second resistive element R2 is electrically connected to the control signal transmission end SDA.

Optionally, on the basis of the above-mentioned embodiment, FIG. 6 is a schematic structural diagram of another signal conversion circuit provided in this creative embodiment, and the current backflow prevention module 3 includes two diodes, wherein one diode D2 It is connected in series with the first resistive element R1, and the two ends connected in series are respectively connected with the output end of the power conversion module 1 and the clock signal transmission end SCL; the other diode D3 is connected in series with the second resistive element R2, The two ends connected in series are respectively connected with the output end of the power conversion module 1 and the control signal transmission end SDA.

6 , when the signal source 4 is turned off or in a non-operating state such as a sleep state, and the playback device 200 is not powered off, the diode D2 and the diode D3 are turned off to prevent the currents I ₁ and I ₂ Backflow to source 4. When the signal source 4 outputs the power supply voltage and the signal to be played, the diode D2 and the diode D3 are turned on, so that the voltage converted by the power conversion module 1 conforms to the preset standard and the voltage converted by the signal conversion module 2 The signal conforming to the preset standard is output to the playback device 200 , so that the playback device 200 plays the signal. Optionally, the anode of the diode D2 is electrically connected to the output end of the power conversion module 1, and the cathode of the diode D2 is electrically connected to the clock signal transmission end SCL through the first resistive element R1. Optionally, the anode of the diode D2 is electrically connected to the output terminal of the power conversion module 1 through the first resistive element R1, and the cathode of the diode D2 is electrically connected to the clock signal transmission terminal SCL. Optionally, the anode of the diode D3 is electrically connected to the output end of the power conversion module 1, and the cathode of the diode D3 is electrically connected to the control signal transmission end SDA through the second resistive element R2. Optionally, the anode of the diode D3 is electrically connected to the output end of the power conversion module 1 through the second resistive element R2, and the cathode of the diode D3 is electrically connected to the control signal transmission end SDA.

Optionally, on the basis of the above-mentioned embodiment, FIG. 7 is a schematic structural diagram of another signal conversion circuit provided in this creative embodiment. The signal conversion circuit further includes a first data interface 7, a first power output end Vo, a target signal The output end So and the data transmission end are arranged in the first data interface 7 .

The first power output end Vo, the target signal output end So, the clock signal transmission end SCL and the control signal transmission end SDA can be disposed in the first data interface 7 . If the signal conversion module 2 is a universal serial bus USB signal to high-definition multimedia interface HDMI signal conversion module, the first data interface 7 can be an HDMI interface. If the signal conversion module 2 is a universal serial bus USB signal-to-video graphics array VGA signal conversion module, the first data interface 7 can be a VGA interface. The playback device 200 such as a display can be electrically connected to the first data interface 7 through a pluggable connector.

Optionally, on the basis of the above-mentioned embodiment, FIG. 8 is a schematic structural diagram of another signal conversion circuit provided by this creative embodiment. The signal conversion circuit further includes a second data interface 8, a power input end Vi and a signal input to be converted. The terminal DP is arranged in the second data interface 8 . If the signal conversion module 2 is a universal serial bus USB signal to high-definition multimedia interface HDMI signal conversion module or a universal serial bus USB signal to a video graphics array VGA signal conversion module, the second data interface 8 can be a USB interface. For example, it may be a USB Type-C interface. The signal source 4 such as the host can be electrically connected to the second data interface 8 through a pluggable connector.

This creative embodiment provides an electronic device. On the basis of the above embodiment, the electronic device includes the signal conversion circuit 100 provided in any embodiment of the present invention.

Wherein, optionally, the electronic device includes at least one of the following: a computer (PC), a signal converter, a software protector (dongle), and a switching, expansion or connection device (Docking station) for the computer. The electronic device provided in the embodiment of the present invention includes the signal conversion circuit in the above-mentioned embodiment. Therefore, the electronic device provided by the embodiment of the present invention also has the functions described in the above-mentioned embodiment, which will not be repeated here.

Optionally, on the basis of the above embodiment, the electronic device further includes a signal source 4; the signal source 4 may include a second power output terminal and a playback signal output terminal. The second power output terminal of the signal source 4 is electrically connected to the power input terminal Vi; the playback signal output terminal of the signal source 4 is electrically connected to the input terminal DP of the signal to be converted.

Optionally, on the basis of the above-mentioned embodiment, FIG. 9 is a schematic structural diagram of an electronic device provided in this creative embodiment. The electronic device further includes: a voltage detection module 5; a voltage detection module 5 and a signal source 4 The second power output terminal of the signal source 4 is electrically connected; the voltage detection module 5 is used for detecting that the voltage on the second power output terminal of the signal source 4 exceeds the preset voltage when the signal source 4 is switched from the non-operating state to the operating state When the signal source 4 is disabled to output the power supply voltage and the signal to be played, the protection mechanism is triggered to prevent the external power supply from damaging the system equipment. The non-operational state may include a shutdown or sleep state, and the like.

This creative embodiment provides an electronic system. On the basis of the above embodiment, the electronic system includes a playback device 200 and the electronic device 10 provided in any embodiment of the present invention. The playback device 200 is electrically connected to the first power output end Vo, the data transmission end and the control signal transmission end SDA.

The playback device 200 can be electrically connected to the first power output end Vo, the target signal output end So, the clock signal transmission end SCL and the control signal transmission end SDA. The playback device 200 may include at least one of the following: a display, an audio and a multimedia device, and the like. The electronic system provided by this creative embodiment includes the electronic device in the above-mentioned embodiment, so the electronic system provided by this creative embodiment also has the functions described in the above-mentioned embodiment, which will not be repeated here.

Optionally, on the basis of the above embodiment, FIG. 10 is a schematic structural diagram of an electronic system provided in this creative embodiment, the playback device includes a display 6, and the display 6 is provided with a second power supply 61 and a memory 62, wherein the first The two power sources 61 are electrically connected to the memory 62 ; the memory 62 is electrically connected to the data transmission terminal; the memory 62 is used to store the resolution information of the display 6 ; the signal source 4 is used to output a signal matching the resolution information of the display 6 .

The memory 62 can be electrically connected to the clock signal transmission end SCL and the control signal transmission end SDA. The memory 62 may include a display data channel (Display Data Channel, DDC for short) memory or the like. The display 6 is provided with an HDMI interface or a VGA interface. Extended display identification data (EDID) information of the display 6 is stored in the DDC memory 62 . The EDID information may include information such as the model and resolution of the display. The DDC memory 62 needs power from the host or the monitor to work. When the monitor is plugged into the host, the host needs to read information such as the model and resolution of the monitor before the host can output the correct resolution acceptable to the monitor. The signal channel corresponding to the SCL pin and SDA pin of the HDMI interface or VGA interface needs to set the pull-up resistors R1 and R2 to the power supply to ensure the stable signal level. When the host is turned off, the display power is not turned off, the first power output Vo (equivalent to the HDMI_5V pin of the HDMI interface or the VGA_5V pin of the VGA interface) has no power supply, and the DDC memory 62 relies on the display power supply to supply power, that is, the SCL pin and the SDA pin will be charged. The anti-current backflow module 3 can avoid backflow of the current from the display 6 returned by the SCL pin and the SDA pin to the signal source 4 .

Note that the above are only the preferred embodiments of the present invention and the applied technical principles. Those of ordinary skill in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, combinations and substitutions can be made to those of ordinary skill in the art without will be out of the scope of protection of this creation. Therefore, although the present creation has been described in more detail through the above embodiments, the present creation is not limited to the above embodiments, and can also include more other equivalent embodiments without departing from the concept of the present creation. The scope is determined by the attached patent application scope.

1: Power conversion module 2: Signal conversion module 3: Anti-current backflow module 4: Signal source 5: Voltage detection module 6: Display 7: First data interface 8: Second data interface 10: Electronic device 61 : second power supply 62: memory 100: signal conversion circuit 200: playback device D1, D2, D3: diode DP: signal input terminals to be converted I ₁ , I ₂ : current R1: first resistive element R2: the first Two resistive elements SCL: clock signal transmission end SDA: control signal transmission end So: target signal output end Vi: power input end Vo: first power output end

[FIG. 1] is a schematic structural diagram of a signal conversion circuit according to an embodiment of the present invention. [FIG. 2] is a schematic diagram of an application scenario of a signal conversion circuit provided by an embodiment of the present invention. [FIG. 3] is a schematic diagram of an anti-current backflow module provided in an embodiment of the present invention when it works. [FIG. 4] is a schematic structural diagram of another signal conversion circuit provided by the present invention. [FIG. 5] is a schematic structural diagram of yet another signal conversion circuit provided in an embodiment of the present invention. [FIG. 6] is a schematic structural diagram of yet another signal conversion circuit provided in an embodiment of the present invention. [FIG. 7] is a schematic structural diagram of yet another signal conversion circuit provided in an embodiment of the present invention. [FIG. 8] is a schematic structural diagram of yet another signal conversion circuit provided in an embodiment of the present invention. [ FIG. 9 ] is a schematic structural diagram of an electronic device according to an embodiment of the present invention. [FIG. 10] is a schematic structural diagram of an electronic system provided in an embodiment of the present invention.

1: Power conversion module

2: Signal conversion module

3: Anti-current backflow module

100: Signal conversion circuit

D1: Diode

DP: Signal input terminal to be converted

R1: The first resistive element

R2: The second resistive element

SCL: clock signal transmission terminal

SDA: control signal transmission terminal

So: target signal output

Vi: power input terminal

Vo: the first power output terminal

Claims (11)

A signal conversion circuit is characterized by comprising: a power input end, a first power output end, a signal input end to be converted, a target signal output end, a data transmission end, a power conversion module, an anti-current backflow module, and a signal conversion module and resistive elements, Wherein, the input end of the power conversion module is electrically connected with the power input end; the output end of the power conversion module is electrically connected with the first power output end; The output end of the power conversion module is electrically connected to the data transmission end through the resistive element; The signal conversion module is electrically connected to the input end of the signal to be converted, the output end of the target signal and the data transmission end; The anti-current backflow module is arranged on the path connected to the power input end, the power conversion module, the resistive element, and the data transmission end; the anti-current backflow module is used for not inputting the power supply voltage at the power input end , prevent the current from flowing back to the input terminal of the power supply. The signal conversion circuit of claim 1, wherein the signal conversion module comprises: a universal serial bus USB signal to high-definition multimedia interface HDMI signal conversion module or a universal serial bus USB signal to video signal graphics array VGA signal conversion module Group. The signal conversion circuit of claim 1, wherein the data transmission end includes a clock signal transmission end and a control signal transmission end, the resistive element includes a first resistive element and a second resistive element; the power conversion module The output end of the power conversion module is electrically connected to the clock signal transmission end through the first resistive element; the output end of the power conversion module is electrically connected to the control signal transmission end through the second resistive element; the signal conversion module is electrically connected to the control signal transmission end The input end of the signal to be converted, the output end of the target signal, the transmission end of the clock signal and the transmission end of the control signal are electrically connected; the anti-current backflow module is arranged on the power input end, the power conversion module, the first resistive The element, the second resistive element, the clock signal transmission end and the control signal transmission end are connected on the path. The signal conversion circuit of claim 3, wherein the anti-current backflow module comprises a diode; The power input terminal is electrically connected to the anode of the diode; the cathode of the diode is electrically connected to the first power output terminal; the cathode of the diode is electrically connected to the clock signal transmission terminal through the first resistive element connection; the cathode of the diode is electrically connected to the control signal transmission terminal through the second resistive element. The signal conversion circuit of claim 4, wherein the output terminal of the power conversion module is electrically connected to the anode of the diode; or the cathode of the diode is electrically connected to the input terminal of the power conversion module. The signal conversion circuit according to claim 1, wherein the signal conversion circuit further comprises a first data interface, and the first power output terminal, the target signal output terminal and the data transmission terminal are arranged in the first data interface. The signal conversion circuit according to claim 6, wherein the signal conversion circuit further comprises a second data interface, and the power input terminal and the to-be-converted signal input terminal are disposed in the second data interface. An electronic device, which is characterized by comprising a signal conversion circuit and a signal source as described in any one of claims 1 to 7; the signal source includes a second power output terminal and a playback signal output terminal, the second power output terminal and The power input end is electrically connected; the play signal output end is electrically connected with the to-be-converted signal input end. The electronic device according to claim 8, wherein the electronic device further comprises: a voltage detection module; the voltage detection module is electrically connected to the second power output terminal of the signal source; the voltage detection module When the signal source is switched from the non-operational state to the operational state, when it is detected that the voltage on the second power output terminal of the signal source exceeds the preset voltage, the signal source is prohibited from outputting the power supply voltage and the signal to be played. An electronic system is characterized by comprising a playback device and the electronic device as described in claim 8 or 9; the playback device is electrically connected with the first power output terminal, the target signal output terminal and the data transmission terminal. The electronic system of claim 10, wherein the playback device includes a display, the display is provided with a second power supply and a memory, wherein the second power supply is electrically connected to the memory; the memory is connected to the data transmission terminal electrical connection; the memory is used for storing the resolution information of the display; the signal source is used for outputting a signal matching the resolution information of the display.

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