DP signal bidirectional switching circuit and DP bidirectional switcher

Abstract

The utility model relates to the technical field of switchers, in particular to a DP signal bidirectional switching circuit and a DP bidirectional switcher, which comprise two paths of input and output modules, a signal switching module, an equalization module, a control module and one path of output and input module, the two paths of input and output modules are respectively connected with a first signal transmission end and a second signal transmission end of the signal switching module, a third signal transmission end of the signal switching module is connected with a first signal transmission end of the equalization module, and a second signal transmission end of the equalization module is connected with the output and input module; the control end of the signal switching module and the control end of the equalization module are connected with the control module. The signal switching module and the equalization module are arranged between the two-path input and output module and the one-path output and input module, so that two-way transmission of DP signals is realized, dynamic signal compensation can be adaptively provided in a long-distance transmission or complex electromagnetic environment, and the transmission efficiency is improved. Therefore, the phenomena of splash screen, snowflakes, no drawing and the like caused by unstable video transmission are avoided.

Description

Technical Field

[0001] This utility model relates to the field of switching technology, and in particular to a DP signal bidirectional switching circuit and a DP bidirectional switch. Background Technology

[0002] A DP switch is a device that allows users to switch signals between multiple computers and one monitor, or between one computer and multiple monitors. It greatly facilitates flexible switching between different devices and is especially suitable for office and gaming environments that require frequent switching, easily eliminating the hassle of constantly plugging and unplugging.

[0003] Currently, DP switchers on the market only support unidirectional signal switching, making it difficult to achieve bidirectional transmission. Furthermore, in long-distance transmission or complex electromagnetic environments, signal attenuation and interference are severe, and they lack dynamic signal compensation capabilities and compatibility. When using cables of poor quality or longer lengths, they can easily cause screen flickering, snow, signal loss, or failure to display images.

[0004] Therefore, designing a bidirectional switching circuit and a bidirectional DP switcher capable of bidirectional transmission and with greater compatibility is of great importance to those skilled in the art. Utility Model Content

[0005] This utility model provides a bidirectional switching circuit and a bidirectional switching device for DP signals that can transmit bidirectionally and has stronger compatibility, in order to solve the problems in the prior art that it is difficult to achieve bidirectional switching transmission and that the compatibility is insufficient. When using cables of poor quality or longer lengths, it is easy to cause screen flickering, snow, or signal loss and failure to display images.

[0006] This utility model discloses a bidirectional switching circuit for DP signals. The circuit includes two input / output modules, a signal switching module, an equalization module, a control module, and one output / input module. The input / output modules and the output / input module are used to connect to devices with DP interfaces. The two input / output modules are respectively connected to the first and second signal transmission terminals of the signal switching module. The equalization module is used for adaptive amplification and compensation of signals from the input / output modules and the output / input module. The first signal transmission terminal of the equalization module is connected to the third signal transmission terminal of the signal switching module, and the second signal transmission terminal of the equalization module is connected to the output / input module. The control terminals of the signal switching module and the equalization module are both connected to the control module.

[0007] Optionally, the input / output module includes a first DP interface, an ESD protection unit is provided on the signal transmission channel of the first DP interface, and a surge protection unit and an overcurrent protection unit are provided on the power input pin of the first DP interface.

[0008] Optionally, the output / input module includes a second DP interface, and each of the different signal transmission channels of the second DP interface is provided with an ESD protection unit, and the power input pin of the second DP interface is provided with an overcurrent protection unit.

[0009] Optionally, the surge protection unit is a TVS diode.

[0010] Optionally, the overcurrent protection unit is a self-resetting fuse.

[0011] Optionally, the first signal transmission terminal, the second signal transmission terminal, and the third signal transmission terminal of the signal switching module each include an AUX signal transmission pin, a DP signal transmission pin, and an HPD signal transmission pin.

[0012] Optionally, both the first and second signal transmission terminals of the equalization module include an AUX signal transmission pin and a DP signal transmission pin.

[0013] Optionally, a capacitor is connected in series on the DP signal transmission pin of the equalization module.

[0014] Optionally, the equalization module is powered by a single 1.8V power supply.

[0015] To address the problems existing in the prior art, this utility model also provides a DP bidirectional switcher, which includes the DP signal bidirectional switching circuit as described above, as well as a circuit board and a housing. The DP signal bidirectional switching circuit is disposed on the circuit board, and the circuit board is disposed in the housing.

[0016] Compared with the prior art, the beneficial effects of the DP signal bidirectional switching circuit provided in this utility model embodiment are as follows: By designing a DP signal bidirectional switching circuit, including two input / output modules, a signal switching module, an equalization module, a control module, and one output / input module; the two input / output modules are respectively connected to the first and second signal transmission terminals of the signal switching module, the third signal transmission terminal of the signal switching module is connected to the first signal transmission terminal of the equalization module, the second signal transmission terminal of the equalization module is connected to the output / input module, and the control terminals of the signal switching module and the equalization module are both connected to the control module; by setting the signal switching module and the equalization module between the two input / output modules and the one output / input module, not only is bidirectional transmission of DP signals realized, but also dynamic signal compensation can be adaptively provided in long-distance transmission or complex electromagnetic environments, thereby avoiding phenomena such as screen flickering, snow, and no image display caused by unstable video transmission. Attached Figure Description

[0017] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0018] Figure 1 This is a block diagram of the DP signal bidirectional switching circuit provided in this embodiment of the utility model;

[0019] Figure 2 This is a circuit diagram of the input / output module provided in an embodiment of this utility model;

[0020] Figure 3 This is a circuit diagram of the input / output module provided in an embodiment of the present invention;

[0021] Figure 4 This is a circuit diagram of the signal switching module provided in this embodiment of the utility model;

[0022] Figure 5 This is a circuit diagram of the equalization module provided in an embodiment of this utility model;

[0023] Figure 6 This is a circuit diagram of the control module provided in an embodiment of the present utility model;

[0024] Figure 7 This is a schematic diagram of the bidirectional switching circuit for DP signals provided in an embodiment of this utility model.

[0025] The labels for the attached figures are as follows:

[0026] 100. Input / output module; 200. Signal switching module; 300. Equalization module; 400. Control module; 500. Output / input module; 10. DP signal bidirectional switching circuit; 20. Circuit board; 30. Housing.

[0027] J1, First DP interface; J2, Second DP interface; D, TVS diode; F, Resettable fuse. Detailed Implementation

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The preferred embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0029] like Figures 1 to 6 As shown, this utility model provides a specific embodiment of a bidirectional switching circuit for DP signals.

[0030] A bidirectional switching circuit for DP signals, reference Figure 1 The DP signal bidirectional switching circuit includes two input / output modules 100, a signal switching module 200, an equalization module 300, a control module 400, and an output / input module 500. The two input / output modules 100 are respectively connected to the first and second signal transmission terminals of the signal switching module 200. The third signal transmission terminal of the signal switching module 200 is connected to the first signal transmission terminal of the equalization module 300. The second signal transmission terminal of the equalization module 300 is connected to the output / input module 500. The control terminals of the signal switching module 200 and the equalization module 300 are both connected to the control module 400.

[0031] Specifically, the two-channel input / output module 100 can be used to connect two different devices with DP interfaces, and the one-channel output / input module 500 can be used to connect one device with a DP interface. The signal switching module 200 is used to process the signals from the two-channel DP input / output module 100 and the one-channel DP output / input module 500. These signals include AUX signals, DP signals, and HPD signals. The signal processing by the signal switching module 200 mainly includes switching between AUX signals, DP signals, and HPD signals. The equalization module 300 is used to adaptively amplify and compensate for high-frequency attenuation, inter-symbol interference, and jitter of the signals from the two-channel DP input / output module 100 and the one-channel DP output / input module 500 during transmission, thereby restoring the integrity of the signals.

[0032] Currently available DP switchers generally only support unidirectional signal switching and cannot achieve bidirectional transmission. For example, they cannot be used normally when there are two monitors at the output end. Furthermore, in long-distance transmission or complex electromagnetic environments, signal attenuation and interference are severe, and they lack dynamic signal compensation capabilities. When using poor-quality or longer transmission lines, the signal will attenuate with increasing distance, especially for high-frequency signals, such as high-resolution videos like 4K and 8K. During long-distance transmission, the degraded signal quality may cause screen flickering, snow, or signal loss resulting in no image output. These defects mean that existing technical solutions can no longer meet the current needs of customers.

[0033] In this embodiment, a bidirectional switching circuit for DP signals is designed, including two input / output modules 100, a signal switching module 200, an equalization module 300, a control module 400, and a single output / input module 500. The two input / output modules 100 are respectively connected to the first and second signal transmission terminals of the signal switching module 200. The third signal transmission terminal of the signal switching module 200 is connected to the first signal transmission terminal of the equalization module 300. The second signal transmission terminal of the equalization module 300 is connected to the output / input module 500. The control terminals of the signal switching module 200 and the equalization module 300 are both connected to the control module 400. By setting the signal switching module 200 and the equalization module 300 between the two input / output modules 100 and the single output / input module 500, bidirectional transmission of DP signals is achieved. In long-distance transmission or complex electromagnetic environments, dynamic signal compensation can be adaptively provided, thereby avoiding phenomena such as screen flickering, snow, and image loss caused by unstable video transmission.

[0034] In one embodiment, reference Figure 1 and Figure 2 The input / output module 100 includes a first DP interface J1. An ESD protection unit is provided on the signal transmission channel of the first DP interface J1, and a surge protection unit and an overcurrent protection unit are provided on the power input pin of the first DP interface J1.

[0035] Specifically, refer to Figure 1 and Figure 2 The input / output module 100 includes a first DP interface J1, an ESD protection unit, a surge protection unit, and an overcurrent protection unit. The ESD protection unit is mainly used for electrostatic discharge protection. The ESD protection units (U1, U2, and U3) in the input / output module 100 are all connected in parallel on the signal transmission channel of the first DP interface J1 to improve the anti-interference capability against the electromagnetic field effect of electrostatic discharge. The surge protection unit in the input / output module 100 is a TVS diode D. The surge protection unit in the input / output module 100 is set on the power input pin of the first DP interface J1 for surge protection of the 3.3V input voltage. When the instantaneous input voltage is too high, the TVS diode D will embed the voltage to 3.3V. The overcurrent protection unit in the input / output module 100 is a self-resetting fuse F to prevent overcurrent or short circuit in the two input / output modules 100. When the current exceeds 1A or the power supply is short-circuited, the self-resetting fuse F will automatically cut off the power input. When the circuit fault is resolved, the self-resetting fuse F will automatically return to the conducting state.

[0036] In one embodiment, reference Figure 1 and Figure 3The input / output module 500 includes a second DP interface J2. Each signal transmission channel of the second DP interface J2 is equipped with an ESD protection unit, and the power input pin of the second DP interface J2 is equipped with an overcurrent protection unit.

[0037] Specifically, refer to Figure 1 and Figure 3 The input / output module 500 includes a second DP interface J2, an ESD protection unit, a surge protection unit, and an overcurrent protection unit. The ESD protection unit is mainly used for electrostatic discharge protection. The ESD protection units (U7, U8, and U9) in the input / output module 500 are all connected in parallel on the signal transmission channel of the second DP interface J2 to improve the anti-interference capability against the electromagnetic field effect of electrostatic discharge. The overcurrent protection unit in the input / output module 500 is a self-resetting fuse F, which is used to prevent overcurrent or short circuit in the input / output module 500. When the current exceeds 1A or the power supply is short-circuited, the self-resetting fuse F will automatically cut off the power supply input. When the circuit fault is resolved, the self-resetting fuse F will automatically return to the conducting state.

[0038] In one embodiment, the first signal transmission terminal, the second signal transmission terminal, and the third signal transmission terminal of the signal switching module 200 each include an AUX signal transmission pin, a DP signal transmission pin, and an HPD signal transmission pin.

[0039] Specifically, refer to Figure 1 and Figure 4 The signal switching module 200 can use the DP2.0 high-speed switching processing chip PI3WVR14412, which has excellent signal integrity, including extremely low insertion loss, reflection loss, crosstalk, and shutdown isolation, to handle the switching of DP signals, AUX signals, and HPD signals. The AUX signal transmission pins in the first signal transmission terminal of the PI3WVR14412 chip include AUX- pin and AUX+A pin. The DP signal transmission pins in the first signal transmission terminal of the PI3WVR14412 chip include D0-A pin, D0+A pin, D1-A pin, D1+A pin, D2-A pin, D2+A pin, D3-A pin, and D3+A pin. The HPD signal transmission pins in the first signal transmission terminal of the PI3WVR14412 chip include HPD_A pin.

[0040] Furthermore, the AUX signal transmission pins in the second signal transmission terminal of the PI3WVR14412 chip include AUX-B and AUX+B pins; the DP signal transmission pins in the second signal transmission terminal of the PI3WVR14412 chip include D0-B, D0+B, D1-B, D1+B, D2-B, D2+B, D3-B, and D3+B pins; and the HPD signal transmission pins in the second signal transmission terminal of the PI3WVR14412 chip include... The third signal transmission terminal of the PI3WVR14412 chip includes the HPD_B pin; the AUX signal transmission pins in the third signal transmission terminal of the PI3WVR14412 chip include the AUX- pin and the AUX+ pin; the DP signal transmission pins in the third signal transmission terminal of the PI3WVR14412 chip include the D0- pin, the D0+ pin, the D1- pin, the D1+ pin, the D2- pin, the D2+ pin, the D3- pin, and the D3+ pin; and the HPD signal transmission pins in the third signal transmission terminal of the PI3WVR14412 chip include the HPD pin.

[0041] In one embodiment, reference Figure 1 , Figure 4 and Figure 5 The first and second signal transmission terminals of the equalization module 300 both include AUX signal transmission pins and DP signal transmission pins. The equalization module 300 can use the PI2DPT1021XEAE chip. When the PI2DPT1021XEAE chip is in DP mode, the internal AUX listener monitors the AUX communication data rate, number of channels, and swing amplitude to adapt to the dynamic gain adjustment of the output. The PI2DPT1021XEAE is powered by a single 1.8V power supply.

[0042] refer to Figure 1 , Figure 4 and Figure 5The AUX signal transmission pins in the first signal transmission terminal of the PI2DPT1021XEAE chip include AUXP and AUXN pins. AUXP and AUXN pins are respectively connected to the AUX+ and AUX- pins of the PI3WVR14412 chip. The DP signal transmission pins in the first signal transmission terminal of the PI2DPT1021XEAE chip include AP_RX2P, AP_RX2N, AP_TX2P, AP_TX2N, and AP_RX1. Pins P, AP_RX1N, AP_TX1P, and AP_TX1N, and pins AP_RX2P, AP_RX2N, AP_TX2P, AP_TX2N, AP_RX1N, AP_RX1P, AP_TX1N, and AP_TX1P are respectively connected to pins D0+, D0-, D1+, D1-, D2-, D2+, D3-, and D3+ of the PI3WVR14412 chip.

[0043] refer to Figure 1 and Figure 5 The AUX signal transmission pins in the second signal transmission terminal of the PI2DPT1021XEAE chip include AUXSBU1 and AUXSBU2 pins. The DP signal transmission pins in the second signal transmission terminal of the PI2DPT1021XEAE chip include CON_TX2P, CON_TX2N, CON_RX2P, CON_RX2N, CON_TX1P, CON_TX1N, CON_RX1P, and CON_RX1N pins.

[0044] Among them, reference Figure 1 and Figure 5 Capacitors C9-C24 are connected in series to the following pins: CON_TX2P, CON_TX2N, CON_RX2P, CON_RX2N, CON_TX1P, CON_TX1N, CON_RX1P, CON_RX1N, AP_RX2P, AP_RX2N, AP_TX2P, AP_TX2N, AP_RX1P, AP_RX1N, AP_TX1P, and AP_TX1N.

[0045] refer to Figures 1 to 6The control module 400 can use the CX32L003F8P6X TSSOP20 chip. The PA2 / OSCOUT pin of the CX32L003F8P6X TSSOP20 chip is connected to the OE pin of the PI3WVR14412 chip. The PA3 pin of the CX32L003F8P6X TSSOP20 chip is connected to the GPU_SEL pin of the signal switching module. The PB4 and PB5 pins of the CX32L003F8P6X TSSOP20 chip are connected to the SDA3P3 and SCL3P3 pins of the PI2DPT1021XEAE chip, respectively.

[0046] like Figure 7 As shown, this utility model also provides a specific embodiment of a DP bidirectional switch.

[0047] A DP bidirectional switch, reference Figure 7 The DP bidirectional switcher includes the aforementioned DP signal bidirectional switching circuit 10, as well as a circuit board 20 and a housing 30. The DP signal bidirectional switching circuit 10 is disposed on the circuit board 20, and the circuit board 20 is disposed in the housing 30, so that the two first DP interfaces J1 and the second DP interface J2 are exposed outside the housing 30.

[0048] It should be understood that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Those skilled in the art can modify the technical solutions described in the above embodiments, or make equivalent substitutions for some of the technical features; and all such modifications and substitutions should fall within the protection scope of the appended claims of this utility model.

Claims

1. A bidirectional switching circuit for DP signals, characterized in that, It includes a two-channel input / output module, a signal switching module, an equalization module, a control module, and a single-channel output / input module. The input / output module and the output / input module are used to connect to devices with DP interfaces. The two input / output modules are respectively connected to the first and second signal transmission terminals of the signal switching module. The equalization module is used to adaptively amplify and compensate signals from the input / output module and the output / input module. The first signal transmission terminal of the equalization module is connected to the third signal transmission terminal of the signal switching module, and the second signal transmission terminal of the equalization module is connected to the output / input module. The control terminals of the signal switching module and the equalization module are both connected to the control module.

2. The DP signal bidirectional switching circuit according to claim 1, characterized in that, The input / output module includes a first DP interface, an ESD protection unit is provided on the signal transmission channel of the first DP interface, and a surge protection unit and an overcurrent protection unit are provided on the power input pin of the first DP interface.

3. The DP signal bidirectional switching circuit according to claim 2, characterized in that, The output / input module includes a second DP interface, and ESD protection units are provided on different signal transmission channels of the second DP interface. An overcurrent protection unit is provided on the power input pin of the second DP interface.

4. The DP signal bidirectional switching circuit according to claim 3, characterized in that, The surge protection unit is a TVS diode.

5. The DP signal bidirectional switching circuit according to claim 3, characterized in that, The overcurrent protection unit is a self-resetting fuse.

6. The DP signal bidirectional switching circuit according to claim 1, characterized in that, The first signal transmission terminal, the second signal transmission terminal, and the third signal transmission terminal of the signal switching module all include an AUX signal transmission pin, a DP signal transmission pin, and an HPD signal transmission pin.

7. The DP signal bidirectional switching circuit according to claim 1, characterized in that, The first and second signal transmission terminals of the equalization module both include AUX signal transmission pins and DP signal transmission pins.

8. The DP signal bidirectional switching circuit according to claim 7, characterized in that, A capacitor is connected in series on the DP signal transmission pin of the equalization module.

9. The DP signal bidirectional switching circuit according to claim 7, characterized in that, The equalization module is powered by a single 1.8V power supply.

10. A DP bidirectional switch, characterized in that, The device includes the DP signal bidirectional switching circuit as described in any one of claims 1-9, and further includes a circuit board and a housing, wherein the DP signal bidirectional switching circuit is disposed on the circuit board and the circuit board is disposed in the housing.

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