Multimedia switching device and multimedia system

Abstract

The utility model provides a multimedia switching device and a multimedia system. The multimedia switching device comprises a first interface; a second interface; the multimedia transmission path is used for transmitting the multimedia data of the host equipment to the load equipment; the multimedia transmission path is configured to be conducted when the first interface and the second interface are both connected with corresponding equipment; the first power transmission path is arranged between the first interface and the second interface and is used for transmitting a power signal of the host equipment to load equipment; a third interface; the second power supply transmission path is used for transmitting the power supply signal of the power supply equipment to the load equipment; and under the condition that the third interface is the interface of the last access device, when the power supply device is connected with the third interface, the power supply path of the load device is switched from the first power supply transmission path to the second power supply transmission path, so that the device for supplying power to the load device is switched from the host device to the power supply device.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of multimedia equipment, and in particular to a multimedia switching device and a multimedia system. Background Art

[0002] Currently, electronic devices, including but not limited to head-mounted display devices, require multimedia data playback via multimedia adapters. For example, some multimedia adapters can connect a payload device (such as a head-mounted display device) to a host device, allowing the payload device to receive multimedia data from the host device for playback. In related art, multimedia adapters have poor performance, and therefore there is a need for a multimedia adapter with better performance to meet the multimedia data playback needs of electronic devices, including but not limited to head-mounted display devices. Utility Model Content

[0003] According to a first aspect of an embodiment of the present application, a multimedia switching device is provided, comprising: a first interface configured to be connected to a host device; a second interface configured to be connected to a load device; a multimedia transmission path arranged between the first interface and the second interface, for transmitting multimedia data of the host device to the load device; wherein the multimedia transmission path is configured to be turned on when the first interface and the second interface are both connected to corresponding devices; a first power transmission path arranged between the first interface and the second interface, for transmitting the power signal of the host device to the load device; a third interface configured to be connected to a power supply device; a second power transmission path arranged between the second interface and the third interface, for transmitting the power signal of the power supply device to the load device; wherein, in the case where the third interface is the interface of the last connected device, when the power supply device is connected to the third interface, the power supply path of the load device is switched from the first power transmission path to the second power transmission path, so that the device supplying power to the load device is switched from the host device to the power supply device.

[0004] According to a second aspect of an embodiment of the present application, a multimedia system is provided, comprising: a multimedia switching device as described in any one of the first aspects, a host device, a load device, and a power supply device, wherein the host device is connected to the first interface of the multimedia switching device, the load device is connected to the second interface of the multimedia switching device, and the power supply device is connected to the third interface of the multimedia switching device. BRIEF DESCRIPTION OF THE DRAWINGS

[0005] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0006] Figure 1 Schematic diagrams showing some exemplary multimedia switching devices in this application.

[0007] Figure 2 Schematic diagrams showing some other exemplary multimedia switching devices in this application.

[0008] Figure 3 Schematic diagrams showing some further exemplary multimedia switching devices in the present application.

[0009] Figure 4 Shown are schematic circuit structure diagrams of some exemplary multimedia switching devices in this application.

[0010] Figure 5 Schematic diagrams showing some exemplary multimedia systems in this application.

[0011] Description of reference numerals:

[0012] 100. Multimedia switching device; 10. Control unit; 11. First interface; 12. Second interface; 13. Third interface; 21. First step-down unit; 22. First adjustment unit; 23. Second adjustment unit; 24. First switch unit; 25. Second step-down unit; 26. Cross switch; 27. Charging controller; 28. Second switch unit; 31. First voltage detection module; 32. Second voltage detection module; 33. Third voltage detection module; R1. First resistor; R2. Second resistor; R3. Third resistor; R4. Fourth resistor; R5. Fifth resistor; R6. Sixth resistor; ADC1. First analog-to-digital conversion module; ADC2. Second analog-to-digital conversion module; ADC3. Third analog-to-digital conversion module. DETAILED DESCRIPTION

[0013] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art should fall within the scope of protection of the embodiments of the present application. It should be understood that the various steps described in the method implementation mode of the present disclosure can be performed in different orders and / or in parallel. In addition, the method implementation mode may include additional steps and / or omit the steps shown. The scope of the present disclosure is not limited in this respect.

[0014] In some optional embodiments, referring to Figure 1 、 Figure 2 or Figure 3As shown, the present application provides a multimedia switching device 100, comprising: a first interface 11, configured to be connected to a host device; a second interface 12, configured to be connected to a load device; a multimedia transmission path, arranged between the first interface 11 and the second interface 12, for transmitting multimedia data of the host device to the load device; wherein the multimedia transmission path is configured to be turned on when the first interface 11 and the second interface 12 are both connected to corresponding devices; a first power transmission path, arranged between the first interface 11 and the second interface 12, for transmitting a power signal of the host device to the load device; a third interface 13, configured to be connected to a power supply device; a second power transmission path, arranged between the second interface 12 and the third interface 13, for transmitting a power signal of the power supply device to the load device; wherein, in the case where the third interface 13 is the last interface to connect to the device, when the power supply device is connected to the third interface 13, the power supply path of the load device is switched from the first power transmission path to the second power transmission path, so that the device supplying power to the load device is switched from the host device to the power supply device.

[0015] In some optional embodiments, the multimedia switching device 100 may include a control unit 10, which may be configured to control at least one of the multimedia transmission path, the first power transmission path, and the second voltage transmission path to implement the multimedia switching function.

[0016] In some optional embodiments, referring to Figure 1 、 Figure 2 or Figure 3 As shown, the multimedia switching device 100 may include: a first interface 11, configured to be connected to a host device; a second interface 12, configured to be connected to a load device; a multimedia transmission path, arranged between the first interface 11 and the second interface 12, for transmitting multimedia data of the host device to the load device; wherein the multimedia transmission path is configured to be conductive when the first interface 11 and the second interface 12 are both connected to corresponding devices; a first power transmission path, arranged between the first interface 11 and the second interface 12, for transmitting a power signal of the host device to the load device; a third interface 13, configured to be connected to a power supply device; a second power transmission path, arranged between the second interface 12 and the third interface 13, for transmitting a power signal of the power supply device to the load device; and a control unit 10, configured to, in a case where the third interface 13 is the last interface connected to the device, control the power supply path of the load device to switch from the first power transmission path to the second power transmission path in response to the power supply device being connected to the third interface 13, so that the device supplying power to the load device switches from the host device to the power supply device.

[0017] In some optional embodiments, referring to Figure 1 、 Figure 2or Figure 3 As shown, the multimedia adapter 100 may include a first interface 11, a second interface 12, a third interface 13, and a control unit 10. The first interface 11 is configured to connect to a host device; the second interface 12 is configured to connect to a load device. A multimedia transmission path for transmitting multimedia data from the host device to the load device and a first power transmission path for transmitting power signals from the host device to the load device may be provided between the second interface 12 and the first interface 11. The third interface 13 is configured to connect to a power supply device. A second power transmission path for transmitting power signals from the power supply device to the load device may be provided between the third interface 13 and the second interface 12. The control unit 10 is configured to, in the event that the third interface 13 is the last interface to be connected to a device, control the load device's power transmission path from the first power transmission path to the second power transmission path in response to the power supply device being connected to the third interface 13, thereby switching the device supplying power to the load device from the host device to the power supply device.

[0018] The multimedia switching device 100 in this embodiment, on the one hand, has a first interface 11 that can be connected to a host device, a second interface 12 that can be connected to a load device, and a multimedia transmission path for transmitting multimedia data from the host device to the load device and a first power transmission path for transmitting a power signal from the host device to the load device can be included between the second interface 12 and the first interface 11. The third interface 13 can be connected to a power supply device, and a second power transmission path for transmitting a power signal from the power supply device to the load device can be included between the third interface 13 and the second interface 12. Therefore, through the multimedia switching device 100, on the basis of being able to achieve the transfer of multimedia data from the host device to the load device, the host device or the power supply device can also power the load device, so that the load device can better play the multimedia data under power supply, thereby improving the effect of multimedia switching and facilitating the improvement of the performance of the multimedia switching device 100. On the other hand, when the third interface 13 is the last interface to connect to the device, if the first interface 11 and the second interface 12 are both connected to the corresponding devices, the multimedia transmission path is in a conductive state. The control unit 10 can control the power supply path of the load device to switch from the first power transmission path to the second power transmission path in response to the power supply device being connected to the third interface 13, so that the device supplying power to the load device is switched from the host device to the power supply device. Therefore, the multimedia adapter 100 can effectively realize the switching of the device supplying power to the load device from the host device to the power supply device. It can be seen that in the solution disclosed in this embodiment, when the third interface 13 is last connected to the corresponding device, there is no unique requirement for the order in which the first interface 11 and the second interface 12 are connected to the corresponding devices. Both can safely realize the power supply of the power supply device to the load device and the multimedia data transmission from the host device to the load device, avoiding conflicts when the host device or the power supply device supplies power to the load device through the multimedia adapter 100, and the operation is simpler and more convenient. On the other hand, since the device supplying power to the load device is switched to the power supply device after the power supply device is connected to the third interface 13, the host device can be dedicated to transmitting multimedia data, which is beneficial to reducing the power consumption of the host device, thereby improving the battery life of the load device when playing multimedia data, thereby improving the use effect of the multimedia adapter 100.

[0019] In some optional embodiments, if the second interface 12 is not the last interface to be connected to the corresponding device, and if the first interface 11 is connected to the corresponding device before the third interface 13, the control unit 10 can control the multimedia transmission path to be connected. Furthermore, when the third interface 13 is connected to the corresponding power supply device, the control unit 10 can control the power supply path of the load device to switch from the first power transmission path to the second power transmission path, so that the device supplying power to the load device switches from the host device to the power supply device.

[0020] In some optional embodiments, the multimedia adapter 100 may include: a first interface 11, a second interface 12, a third interface 13, and a control unit 10. The multimedia adapter 100 may not restrict the order in which the first interface 11, the second interface 12, and the third interface 13 are connected to corresponding devices. After the three interfaces are connected to corresponding devices, the control unit 10 may control the load device to be directly powered by the second power transmission path, or the control unit 10 may control the load device to switch from the first power transmission path to the second power transmission path for power supply. This allows the host device to transmit multimedia data to the load device connected to the second interface 12 via the first interface 11, and the power supply device to supply power to the load device connected to the second interface 12 via the third interface 13. The multimedia adapter 100 is provided with two power transmission paths, the first power transmission path and the second power transmission path, for supplying power to the load device connected to the second interface 12. The control unit 10 is configured to switch between the two power transmission paths. This allows the multimedia adapter 100 to be connected to corresponding devices in any order, and can provide power signals and multimedia signals to the load device connected to the second interface 12 via the third interface 13 and the first interface 11.

[0021] In some optional embodiments, the multimedia switching device 100 may include: a first interface 11, a second interface 12, a third interface 13, and a control unit 10. The multimedia switching device 100 may not limit the order in which the devices corresponding to at least two of the first interface 11, the second interface 12, and the third interface 13 are inserted. After the three interfaces are respectively inserted with corresponding devices, the host device transmits multimedia data to the load device connected to the second interface 12 through the first interface 11, and the power supply device supplies power to the load device connected to the second interface 12 through the third interface 13.

[0022] The multimedia switching device 100 will be further described below with reference to the accompanying drawings of the embodiments of the present application.

[0023] In some optional embodiments of the present application, the first interface 11 can be an interface on the multimedia adapter 100 for connecting to a host device that provides multimedia data. It can be seen that the first interface 11 has the ability to output multimedia data, and the first interface 11 can also be multiplexed as a power interface. Here, the first interface 11 is multiplexed as a power interface, and can be a power interface multiplexed as a unidirectional output (i.e., supporting the host device to output power to the load device in a unidirectional manner). Optionally, the first interface 11 can also be a power interface multiplexed as a bidirectional input and output (e.g., supporting both the host device to output power to the load device and the power supply device to input power to the host device). The first interface 11 and the second interface 12 can include a multimedia transmission path for transmitting multimedia data from the host device to the load device, and a first power transmission path for transmitting a power signal from the host device to the load device. Therefore, the first interface 11 can obtain multimedia data from the host device and output it to the second interface 12, and in some specific cases, can also obtain a power signal from the host device and output it to the second interface 12. Multimedia data can include, for example, but is not limited to, at least one of video data, audio data, image data, etc. The first interface 11 can use any type of interface. In some examples, the first interface 11 may be a USB Type-C interface, or may be another type of interface. The USB Type-C interface facilitates the use of multiple communication protocols for data transmission to meet the needs of multimedia data transmission and power supply, such as UAC (USB Audio Class) protocol, DP (Display Port) protocol, PD (Power Delivery) protocol, etc., and ensures the transmission reliability of the corresponding data.

[0024] In some optional embodiments, the host device can be any electronic device capable of outputting multimedia data and power signals. For example, the host device may include, but is not limited to, mobile phones, tablet computers, computers, car computers, servers, game consoles, and other electronic devices. It should be understood that the host device can be selected as needed and is not specifically limited here. For the purpose of explaining the embodiments of this application, the host device may also be referred to as HOST below.

[0025] In the embodiment of the present application, the second interface 12 can be an interface on the multimedia adapter 100 for connecting to a load device. The second interface 12 can be any type of interface. In some examples, the second interface 12 can be a USB Type-C interface, or can also be another type of interface.

[0026] In some optional embodiments of the present application, the load device may be any electronic device. For example, the load device may include but is not limited to: mobile phones, tablet computers, computers, car computers, servers and other electronic devices. In some optional embodiments, the load device may be a head-mounted display device. Head-mounted display devices may include but are not limited to AR (Augmented Reality) glasses, VR (Virtual Reality) glasses, etc. By connecting the load device to the second interface 12, it is convenient for the load device to obtain multimedia data and power supply through the multimedia adapter 100 for the operation of the load device. For the convenience of explaining the embodiments of the present application, the load device may also be referred to as LOAD in the following text.

[0027] In some optional embodiments of the present application, the third interface 13 can be an interface on the multimedia adapter 100 for connecting to a power supply device. The third interface 13 can serve as a power interface, capable of obtaining a power signal from the power supply device and outputting it to the second interface 12. The third interface 13 can be any type of interface. In some examples, the third interface 13 can be a USB Type-C interface, or other types of interfaces.

[0028] Optionally, the power supply device in the present application may be a charger (the charger can be connected to the mains and output the required power signal to the outside). The charger may include, for example, but is not limited to, a PD charger (PD stands for Power Delivery, power output, and a PD charger is also a charger that supports the PD charging protocol), and a QC charger (QC stands for Quick Charge, fast charging, and a QC charger is also a charger that supports the QC charging protocol). Alternatively, the above-mentioned power supply device may also be other electronic devices with power output capabilities (for example, it may include but is not limited to mobile phones, tablet computers, computers, car machines, servers, game consoles, power banks, and other electronic devices with charging functions). For the convenience of illustrating the embodiments of the present application, the power supply device may also be referred to as Charger in the following text.

[0029] In some optional embodiments of the present application, the control unit 10 may include any controller with output processing and control capabilities. For example, it may include but is not limited to a CPU (Central Processing Unit), an MCU (Microcontroller Unit), a GPU (Graphic Processing Unit), an FPGA (Field Programmable Gate Array), etc. For ease of explanation, the present application may illustrate the control unit 10 as an MCU.

[0030] In some optional embodiments, the multimedia switching device 100 may include three interfaces, and the devices of the three interfaces may have different access orders. For example, assuming that all three interfaces are connected to their corresponding devices, the first interface 11, the second interface 12, and the third interface 13 are respectively recorded as 11, 12, and 13, and there may be at least six different access orders: (11, 12, 13), (12, 11, 13), (12, 13, 11), (13, 12, 11), (11, 13, 12), and (13, 11, 12). It should be noted that the form (11, 12, 13) may mean that the first interface 11 is first connected to the corresponding device (i.e., the host device), the second interface 12 is second to be connected to the corresponding device (i.e., the load device), and the third interface 13 is last connected to the corresponding device (i.e., the power supply device). The rest of the cases are similar and will not be described in detail here.

[0031] In some optional embodiments, when the third interface 13 is the last interface to be connected to the device, that is, the first two of the above six different access orders, namely (11, 12, 13) and (12, 11, 13). In the above case, if the first interface 11 and the second interface 12 are both connected to the corresponding devices, the multimedia transmission path is in a conductive state, and the first power transmission path is also in a conductive state. Subsequently, the host device connected to the first interface 11 can transmit multimedia data to the load device connected to the second interface 12 through the multimedia transmission path, and supply power to the load device through the first power transmission path, so that the load device (such as a head-mounted display device) can play the multimedia data normally. In the above case, when the power supply device is connected to the third interface 13, the control unit 10 can control the power supply path of the load device to switch from the first power transmission path to the second power transmission path in response to the power supply device being connected to the third interface 13, and control the second power transmission path to be conductive, so that the device supplying power to the load device switches from the host device connected to the first interface 11 to the power supply device connected to the third interface 13. After the switching is completed, the power supply device can supply power to the load device through the second power transmission path, and the host device can transmit multimedia data to the load device through the multimedia transmission path, so that the load device (such as a head-mounted display device) can still play multimedia data normally.

[0032] It should be understood that the connection of the third interface 13 to the power supply device is not a condition that must be met for the multimedia transmission path to be conductive. This is because, for the two access sequences (11, 12, 13) and (12, 11, 13), as long as the first interface 11 and the second interface 12 are connected to the corresponding devices, the multimedia transmission path will be conductive, and it is not necessary for the third interface 13 to be connected to the power supply device. However, in both access sequences, when the control unit 10 controls the switching of the power transmission path, the connection of the third interface 13 to the power supply device is a necessary condition.

[0033] In some optional embodiments, in the multimedia switching device 100 , when the first interface 11 is the last interface to access the device, when the host device is connected to the first interface 11 , the multimedia transmission path is connected.

[0034] In some optional embodiments, the control unit 10 is further configured to: when the first interface 11 is the last interface to access the device, in response to the host device being connected to the first interface 11, control the multimedia transmission path to be connected.

[0035] In some optional embodiments, the control unit 10 is further configured to: when the second interface 12 is not the last interface to connect to the device, if the third interface 13 is connected to the corresponding device before the first interface 11, in response to the host device being connected to the first interface 11, control the multimedia transmission path and the second power transmission path to be connected. In this case, there is no unique requirement for the order in which the devices of the second interface 12 and the third interface 13 are connected. In this embodiment, when the first interface 11 is the last interface to connect to the device, when the first interface 11 is connected to the host device, the control unit 10 can control the multimedia transmission path to be connected, so that the host device connected to the first interface 11 can transmit multimedia data to the load device connected to the second interface 12 through the multimedia transmission path. Since both the second interface 12 and the third interface 13 are connected to the corresponding devices when the first interface 11 is connected, the control unit 10 can also control the second power transmission path to be connected, so that the power supply device connected to the third interface 13 can supply power to the load device through the second power transmission path, so that the load device (e.g., a head-mounted display device) can play multimedia data normally, thereby realizing the multimedia switching function.

[0036] In addition, the situation in which the first interface 11 is the last interface to access the device corresponds to the middle two of the six access sequences mentioned above, namely (12, 13, 11) and (13, 12, 11). Therefore, the multimedia switching device 100 can reasonably conduct the transmission of power supply signals and multimedia data signals according to the order in which the first interface 11, the second interface 12, and the third interface 13 are accessed to the device, thereby avoiding conflicts when the host device or the power supply device supplies power to the load device through the multimedia switching device 100, and the multimedia switching device 100 does not have a unique requirement for the access order of the three interfaces, further improving the convenience of user operation.

[0037] Furthermore, since the first interface 11 is the last interface to connect the device, the power supply device connected to the second interface 12 can be used to power the load device through the second power transmission path, rather than using the first power transmission path of the host device connected to the first interface 11 to power the load device. This allows the host device to be dedicated to transmitting multimedia data, which is beneficial to reducing the power consumption of the host device, thereby improving the battery life of the load device when playing multimedia data, thereby improving the use effect of the multimedia adapter 100.

[0038] It can be understood that the connection between the first interface 11 and the host device is not a condition that must be met for the second power transmission path to be turned on. Because, for the two access sequences (12, 13, 11) and (13, 12, 11), the second power transmission path can be controlled to be turned on by the control unit 10 after the second interface 12 and the third interface 13 are both connected to the corresponding devices. That is, as long as the second interface 12 and the third interface 13 are plugged into the corresponding devices, the second power transmission path will be turned on, and there is no need to connect the first interface 11 to the host device. However, in these two access sequences, when the control unit 10 controls the multimedia transmission path to be turned on, the connection between the first interface 11 and the power supply device is a condition that it must meet.

[0039] Of course, in addition to some optional embodiments in which the control unit 10 directly controls the second power transmission path to be turned on when both the second interface 12 and the third interface 13 are connected to corresponding devices, in other optional embodiments, when both the second interface 12 and the third interface 13 are connected to corresponding devices, the control unit 10 may not first control the second power transmission path to be turned on, but instead, when the first interface 11 is the last interface to connect to the device, the control unit 10 controls the multimedia transmission path and the second power transmission path to be turned on in response to the host device being connected to the first interface 11. This can be set as needed and is not particularly limited in this application.

[0040] In some optional embodiments, when the second interface 12 of the multimedia switching device 100 is the last interface to connect to the device, when the load device is connected to the second interface 12 , the multimedia transmission path and the second power transmission path are connected.

[0041] In some optional embodiments, the control unit 10 is further configured to: when the second interface 12 is the last interface to connect the device, in response to the load device being connected to the second interface 12, control the multimedia transmission path and the second power transmission path to be turned on.

[0042] In this embodiment, when the second interface 12 is the last interface to connect a device to the multimedia adapter 100, when the second interface 12 is connected to the corresponding device, the control unit 10 can control the multimedia transmission path to be connected, so that the host device connected to the first interface 11 can transmit multimedia data to the load device connected to the second interface 12 via the multimedia transmission path. Furthermore, when the second interface 12 is connected to the corresponding device, the control unit 10 can control the second power transmission path to be connected, so that the power supply device connected to the third interface 13 can supply power to the load device via the second power transmission path. The load device (e.g., a head-mounted display device) can play multimedia data normally, thus achieving the functions of power supply and multimedia switching.

[0043] In addition, the case where the second interface 12 is the last interface to connect to the device corresponds to the last two of the six access sequences mentioned above, namely (11, 13, 12) and (13, 11, 12). Therefore, the multimedia switching device 100 reasonably controls the conduction of the power supply signal and the multimedia data signal according to the timing of the first interface 11, the second interface 12, and the third interface 13 connecting to the device, avoiding conflicts when the host device or the power supply device supplies power to the load device through the multimedia switching device 100. In addition, there is no single requirement for the order in which the three interfaces connect to the corresponding devices, further improving the convenience of user operation.

[0044] Furthermore, since the second interface 12 is the last interface to connect the device, the power supply device connected to the second interface 12 is used to power the load device through the second power transmission path, rather than using the first power transmission path of the host device connected to the first interface 11 to power the load device, so that the host device can be dedicated to transmitting multimedia data, which is beneficial to reducing the power consumption of the host device, thereby improving the battery life of the load device when playing multimedia data, thereby improving the use effect of the multimedia adapter 100.

[0045] It should be understood that for both access sequences (11, 13, 12) and (13, 11, 12), the connection between the second interface 12 and the load device is a condition that needs to be met by the control unit 10 when controlling the multimedia transmission path.

[0046] In some optional embodiments, the settings of the first power transmission path, the second power transmission path and the control unit 10 in the multimedia switching device 100 can enable the multimedia switching device 100 to control the power supply device connected to the third interface 13 and the host device connected to the first interface 11 to provide power signals and multimedia data to the load device connected to the second interface 12 respectively when the first interface 11, the second interface 12 and the third interface 13 are connected to the corresponding electronic devices in any order, so that the load device can operate normally.

[0047] In some optional embodiments, the multimedia switching device 100 may further include a third power transmission path, which may be provided between the first interface 11 and the third interface 13. When the second power transmission path is turned on, the third power transmission path is turned on, so that the power supply device connected to the third interface 13 can simultaneously power the main device and the load device. Optionally, the third power transmission path may reuse part of the first power transmission path and the second power transmission path, so that the power signal output by the second power transmission path may be divided into two directions, one of which may transmit the electrical signal in the reverse direction of the first power transmission path to the first interface 11, thereby enabling the power supply device to supply power to the host device. The third power transmission path will be described in detail below.

[0048] In some optional embodiments, when at least one of the first interface 11 and the third interface 13 is connected to a corresponding device, the control unit 10 may start and monitor the device access status of the first interface 11 , the second interface 12 , and the third interface 13 .

[0049] Based on this, the control unit 10 monitors the device access status of the first interface 11, the second interface 12 and the third interface 13, which is conducive to determining the device access order of different interfaces, thereby reasonably arranging the power output and multimedia signal output methods according to the timing, and realizing the normal operation of the load device after the three interfaces of the multimedia switching device 100 are inserted in any order, thereby improving the multimedia switching effect and power supply effect.

[0050] The control unit 10 can monitor the device access status of multiple interfaces in any suitable manner. Optionally, the multimedia switching device 100 in the present application can monitor the device access status of each interface by monitoring changes in relevant information of the charging protocol (such as PD charging protocol, QC charging protocol, etc.) of each interface, which can be caused by the device access interface.

[0051] Optionally, the multimedia switching device 100 in the present application may also include a detection unit, which can detect the electrical parameters of the electrical signal output by at least one of the first interface 11, the second interface 12, and the third interface 13, and send the electrical parameters to the control unit 10. The control unit 10 can monitor the device access status through changes in the electrical parameters detected by the detection unit.

[0052] The detection unit can be used to detect any suitable electrical parameter, for example, at least one of a voltage value, a current value, a power value, etc. Alternatively, other electrical parameters can be used as long as they meet the requirements.

[0053] For example, refer to Figure 4 As shown, the detection unit may include a first voltage detection module 31, which includes a first resistor R1 and a second resistor R2. The first end of the first resistor R1 is connected to the first interface 11, the second end of the first resistor R1 is connected to the first end of the second resistor R2, and the second end of the second resistor R2 is grounded. The control unit 10 is connected to the electrical connection line between the second end of the first resistor R1 and the first end of the second resistor R2. It can be understood that the resistor divider circuit composed of the first resistor R1 and the second resistor R2 can be effectively used to detect voltage, enabling the first voltage detection module 31 to effectively detect the voltage value output by the first interface 11.

[0054] Optionally, refer to Figure 4 In the circuit structure shown, the control unit 10 may include a first analog-to-digital conversion module ADC1. The first voltage detection module 31 may be connected to the first analog-to-digital conversion module ADC1 and output the detected first analog data to the first analog-to-digital conversion module ADC1. The first analog-to-digital conversion module ADC1 performs analog-to-digital conversion on the first analog data, processing it into first digital data that can indicate a voltage value. The control unit 10 may use the first digital data as a voltage value and monitor the device connection status of the first interface 11 based on changes in the voltage value.

[0055] It should be understood that the reason why the above-mentioned first voltage detection module 31 can detect whether the host device is connected to the first interface 11 is that: when the host device is connected to the first interface 11, the electrical signal it outputs will cause the first analog data given to the control unit 10 by the first voltage detection module 31 to change, and then the first digital data will also change. Therefore, the control unit 10 can determine in real time through this change that the host device has been connected to the first interface 11; conversely, if the host device is not connected to the first interface 11, the above-mentioned change will not occur, so the control unit 10 can determine in real time that the first interface 11 is not connected to the host device. Correspondingly, when the host device changes from being connected to the first interface 11 to being disconnected, the first digital data will also change, so the device connection status of the first interface 11 can be determined in real time.

[0056] For example, refer to Figure 4 As shown, the detection unit may further include a second voltage detection module 32, which includes a third resistor R3 and a fourth resistor R4. The first end of the fourth resistor R4 is connected to the second interface 12, the second end of the fourth resistor R4 is connected to the first end of the third resistor R3, and the second end of the third resistor R3 is grounded. The control unit 10 is connected to the electrical connection line between the second end of the fourth resistor R4 and the first end of the third resistor R3. It will be understood that the resistor divider circuit formed by the fourth resistor R4 and the third resistor R3 can be effectively used for voltage detection, enabling the second voltage detection module 32 to effectively detect the voltage value output by the second interface 12.

[0057] Optionally, refer to Figure 4 In the circuit structure shown, the control unit 10 may include a second analog-to-digital conversion module ADC2. The second voltage detection module 32 may be connected to the second analog-to-digital conversion module ADC2 and output the detected second analog data to the second analog-to-digital conversion module ADC2. The second analog-to-digital conversion module ADC2 performs analog-to-digital conversion on the second analog data, processing it into second digital data that can indicate a voltage value. The control unit 10 may use the second digital data as a voltage value and monitor the device connection status of the second interface 12 based on changes in the voltage value.

[0058] It should be understood that the reason why the second voltage detection module 32 can detect whether a load device is connected to the second interface 12 is that when the load device is connected to the second interface 12, the electrical signal it outputs causes the second analog data provided by the second voltage detection module 32 to the control unit 10 to change, and thus the second digital data will also change. Therefore, the control unit 10 can determine in real time that the load device is connected to the second interface 12 based on this change. Conversely, if the load device is not connected to the second interface 12, the above-mentioned change will not occur, so the control unit 10 can determine in real time that the load device is not connected to the second interface 12. Accordingly, when the load device changes from being connected to the second interface 12 to being disconnected, the second digital data will also change, so the device connection status of the second interface 12 can be determined in real time.

[0059] For example, refer to Figure 4As shown, the detection unit may further include a third voltage detection module 33, which includes a fifth resistor R5 and a sixth resistor R6. The first end of the sixth resistor R6 is connected to the third interface 13, the second end of the sixth resistor R6 is connected to the first end of the fifth resistor R5, and the second end of the fifth resistor R5 is grounded. The control unit 10 is connected to the electrical connection line between the second end of the sixth resistor R6 and the first end of the fifth resistor R5. It will be understood that the resistor divider circuit formed by the sixth resistor R6 and the fifth resistor R5 can be effectively used for voltage detection, enabling the third voltage detection module 33 to effectively detect the voltage value output by the third interface 13.

[0060] Optionally, refer to Figure 4 In the circuit structure shown, the control unit 10 may include a third analog-to-digital conversion module ADC3. The third voltage detection module 33 may be connected to the third analog-to-digital conversion module ADC3 and output the detected third analog data to the third analog-to-digital conversion module ADC3. The third analog-to-digital conversion module ADC3 performs analog-to-digital conversion on the third analog data, processing it into third digital data that can indicate a voltage value. The control unit 10 may use the third digital data as a voltage value and monitor the device connection status of the third interface 13 based on changes in the voltage value.

[0061] It should be understood that the reason why the third voltage detection module 33 can detect whether the power supply device is connected to the third interface 13 is that when the power supply device is connected to the second interface 12, the electrical signal output by the third voltage detection module 33 will cause the third analog data given to the control unit 10 by the third voltage detection module 33 to change, and then the third digital data will also change. Therefore, the control unit 10 can determine in real time through this change that the power supply device has been connected to the third interface 13; conversely, if the power supply device is not connected to the third interface 13, the above-mentioned change will not occur, so the control unit 10 can determine in real time that the third interface 13 is not connected to the power supply device. Accordingly, when the power supply device changes from being connected to the third interface 13 to being not connected, the third digital data will also change, so the device connection status of the third interface 13 can be determined in real time.

[0062] In some optional embodiments, the control unit 10 can be powered by at least one of the devices connected to the first interface 11 and the third interface 13 when at least one of the first interface 11 and the third interface 13 is connected to a corresponding device, thereby starting up, thereby monitoring the device access status of the first interface 11, the second interface 12 and the third interface 13.

[0063] The multimedia transmission path in this application can be formed by any circuit structure. For example, in some optional embodiments, refer to Figure 2 、 Figure 3 or Figure 4As shown, the multimedia switching device 100 may further include a cross switch 26, which may be connected between the first interface 11 and the second interface 12. The cross switch 26 is connected to the control unit 10, and at least one multimedia transmission path is formed between the cross switch 26 and the first interface 11 and the second interface 12.

[0064] It should be understood that in the present application, by providing a cross switch 26 to form at least one multimedia transmission path, the control unit 10 can flexibly control the transmission of multimedia signals, thereby effectively improving the effect of multimedia switching.

[0065] like Figure 2 As shown, the cross switch 26 can form multiple multimedia transmission paths, and the control unit 10 can be set as needed to control any 1 to N multimedia transmission paths among the N multimedia transmission paths to be turned on, so as to transmit the multimedia data of the host device to the load device. Figure 4 In the example, N can be 4, denoted as Data1 to Data4. When multimedia data needs to be transmitted, the control unit 10 can control at least one of the multimedia transmission paths Data1 to Data4 to be connected. Optionally, when multiple multimedia transmission paths are controlled to be connected, the same or different multimedia data can be transmitted through each of the multiple connected multimedia transmission paths. The above configuration can be flexible and is not specifically limited here.

[0066] Alternatively, as Figure 4 As shown, the crossbar switch 26 can be connected to a GPIO (General-Purpose Input / Output) port of the control unit 10. Of course, this is only an example connection method, and other connection methods can also be used.

[0067] The present application does not limit the specific circuit structure of the first power transmission path. Figure 4 As shown, the first power transmission path may include a first voltage reduction unit 21 and a first adjustment unit 22. The first voltage reduction unit 21 may be connected between the first interface 11 and the first adjustment unit 22, and the first adjustment unit 22 may be connected to the second interface 12.

[0068] In some optional embodiments, when the first power transmission path of the multimedia switching device 100 is turned on, the first step-down unit 21 is used to step down the first power signal obtained by the first interface 11 from the host device, and the first adjustment unit 22 receives the electrical signal obtained after the step-down and outputs the output power signal to the second interface 12 to power the load device through the second interface 12.

[0069] In some optional embodiments, the first adjustment unit 22 is further connected to the control unit 10. When the first power transmission path is conductive, the first step-down unit 21 is used to step down the first power signal obtained by the first interface 11 from the host device. The control unit 10 controls the first adjustment unit 22 to adjust the electrical signal obtained after the step-down process into an output power signal and then power the load device through the second interface 12.

[0070] Based on this, the circuit structure of the first power transmission path, when turned on, can step down the first power signal received by the first interface 11 from the host device through the first step-down unit 21 and then transmit it to the first adjustment unit 22, thereby preventing the voltage signal input to the first adjustment unit 22 from being too high. The control unit 10 can then control the first adjustment unit 22 to adjust the resulting electrical signal after the step-down process into an output power signal, which is then used to power the load device, thereby achieving dynamic power regulation for the load device. This avoids the problem of the load device's normal operation being affected by inappropriate host device output power (e.g., parameters that are too high or too low), thereby effectively meeting the load device's power supply needs.

[0071] The first power signal can be an electrical signal output by the host device to the first interface 11. The first power signal can be a power signal with a voltage within a preset range, the specific range of which is not limited here. For example, in one example, it can be 5V to 20V. In the above embodiment, the first step-down unit 21 is used to perform voltage reduction processing, so that the electrical signal after voltage reduction processing can match the voltage required for the load device to operate. For example, the operating voltage required by the load device can be around 5V. Of course, this example is only an example with a wide range of current applications, and the specific operating voltage can be set as needed.

[0072] For example, the first step-down unit 21 can step down the voltage of the 5V to 20V electrical signal, so that it is stabilized at about 5V. The first adjustment unit 22 can obtain the 5V electrical signal obtained after the voltage step-down and receive the control of the control unit 10.

[0073] The system is adaptively adjusted to output an output voltage signal for power supply to the load device, thereby realizing power supply to the load device and enabling the load device to enter a working state.

[0074] The specific circuit structure of the first step-down unit 21 is not limited herein. Optionally, the first step-down unit 21 may include a DC-DC step-down converter circuit (i.e., a DC-DC Buck circuit). For example, in one embodiment, a DC-DC Buck circuit with a 5V output may be used. Using a DC-DC Buck circuit for voltage reduction has the advantages of high efficiency, stable output, simple control, and low cost.

[0075] The specific circuit structure of the first adjustment unit 22 is not limited here. Optionally, the first adjustment unit 22 may include a load switch module and an adjustable resistance module connected to each other. The load switch module may be connected between the first interface 11 and the second interface 12, and the adjustable resistance module may be connected to the control unit 10. The control unit 10 controls the resistance value of the adjustable resistance module so that the load switch module can adjust the electrical signal obtained after the voltage reduction processing by the first step-down unit 21 based on the resistance value of the adjustable resistance module, and output the adjusted output power signal to the second interface 12. It should be understood that through such a circuit structure, dynamic adjustment of the power supply to the load device can be effectively achieved. For example, if the control unit 10 increases the resistance value of the adjustable resistance module, the load switch module can reduce the current of the electrical signal obtained after the voltage reduction processing by the first step-down unit 21; if the control unit 10 decreases the resistance value of the adjustable resistance module, the load switch module can increase the current of the electrical signal obtained after the voltage reduction processing by the first step-down unit 21.

[0076] Optionally, the first adjustment unit 22 may be connected to a GPIO (General-Purpose Input / Output) port of the control unit 10. Of course, this is only an example connection method and does not constitute any limitation to the embodiments of the present application.

[0077] In other optional embodiments, when the power supply requirements are met, the first power transmission path may not be provided with the first adjustment unit 22, and the electrical signal obtained by the voltage reduction processing of the first voltage reduction unit 21 is directly used to supply power to the load device through the second interface 12.

[0078] Optionally, the second power transmission path can be two power transmission paths that are independent of the first power transmission path. That is, there may be no circuit structure that is mutually usable between the second power transmission path and the first power transmission path. For example, Figure 1 and Figure 2 As shown for understanding.

[0079] In other optional embodiments, the second power transmission path and the first power transmission path may not be two independent power transmission paths. That is, there may be a circuit structure that is mutually usable between the second power transmission path and the first power transmission path. This is conducive to the full utilization of circuit structure resources. For example, it can be combined with Figure 3 and Figure 4 As shown for understanding.

[0080] The present application does not limit the specific circuit structure of the second power transmission path. For example, in some optional embodiments, refer to Figure 4In the circuit structure shown, the second power transmission path may include a second adjustment unit 23, a first step-down unit 21, and a first adjustment unit 22. A first end of the second adjustment unit 23 is connected to the third interface 13, and a second end of the second adjustment unit 23 is connected between the first interface 11 and the first step-down unit 21.

[0081] In some optional embodiments, when the second power transmission path of the multimedia switching device 100 is conductive, the second adjustment unit 23 receives the second power signal obtained by the third interface 13 from the power supply device and outputs the first adjusted electrical signal to the first step-down unit 21. The first step-down unit 21 steps down the first adjusted electrical signal. The first adjustment unit 21 receives the stepped-down first adjusted electrical signal and outputs the output power signal to the second interface 12 to power the load device through the second interface 12. Optionally, the first adjusted electrical signal can be an electrical signal obtained by the second adjustment unit 23 adjusting the second power signal obtained by the third interface 13 from the power supply device. Optionally, the first adjustment unit 22 can adjust the stepped-down first adjusted electrical signal by the first step-down unit 21 to obtain the output power signal.

[0082] In some optional embodiments, the second adjustment unit 23 is further connected to the control unit 10. When the second power transmission path is conductive, the control unit 10 is configured to control the second adjustment unit 23 to adjust the second power signal obtained by the third interface 13 from the power supply device, the first step-down unit 21 to step down the electrical signal obtained after adjustment by the second adjustment unit 23, and the first adjustment unit 22 to adjust the stepped-down electrical signal into an output power signal and then power the load device through the second interface 12.

[0083] Based on this, the circuit structure of the second power transmission path described above, when it is turned on, can adjust the second power signal obtained by the third interface 13 from the power supply device through the second adjustment unit 23, so that the electrical signal input to the first step-down unit 21 is dynamically adjustable to meet the dynamic demand for powering or charging the load device. The electrical signal obtained after adjustment by the second adjustment unit 23 is then stepped down by the first step-down unit 21 to avoid excessive voltage signals input to the first adjustment unit 22. The first adjustment unit 22 then adjusts the stepped-down electrical signal into an output power signal, and powers the load device through the second interface 12, thereby achieving dynamic adjustment of the power supply to the load device. This facilitates avoiding the disadvantage of affecting the normal operation of the load device due to inappropriate power output from the power supply device (such as parameters that are too high or too low), thereby effectively meeting the power supply needs of the load device.

[0084] The second power signal may be an electrical signal output by the power supply device to the third interface 13. The second power signal may be a power signal with a voltage within a preset range, the specific range of which is not limited here, for example, 5V to 20V.

[0085] There is no specific restriction on the circuit structure of the second adjustment unit 23, as long as it can meet the needs. In some optional embodiments, the second adjustment unit 23 may include a DC-DC boost chopper circuit, that is, a DC-DC Buck-Boost circuit. This is a DC conversion circuit that can simultaneously achieve boost and buck functions, which has the advantages of lower input-output voltage difference, smaller internal loss, smaller temperature drift, higher output voltage stability, better load and linear regulation rate, wider operating temperature range, wider input voltage range, etc., and the peripheral circuit is relatively simple and easy to use. Through such a circuit structure, the current and / or voltage of the second power supply signal output from the third interface 13 can be effectively adjusted.

[0086] In some optional embodiments, referring to Figure 3 and Figure 4 As shown, a third power transmission path for transmitting a power signal of the power supply device to the host device is included between the third interface 13 and the first interface 11 .

[0087] In some optional embodiments, if the third interface 13 of the multimedia switching device 100 is connected to the corresponding device before the first interface 11, when the host device is connected to the first interface 11, the third power transmission path is turned on, so that the power supply device supplies power to the host device through the third power transmission path.

[0088] In some optional embodiments, the control unit 10 is further configured to: if the third interface 13 is connected to the corresponding device before the first interface 11, in response to the host device being connected to the first interface 11, control the third power transmission path to be turned on so that the power supply device supplies power to the host device through the third power transmission path.

[0089] Based on this, by setting a third power transmission path between the third interface 13 and the first interface 11, the power supply device can effectively supply power to the host device through the third power transmission path to meet the power supply requirements of the host device, thereby facilitating better implementation of the multimedia switching function of the multimedia switching device 100.

[0090] Optionally, the first interface 11 can serve as a bidirectional power interface capable of receiving electrical signals from a host device to supply power to a load device, and can also output electrical signals to the host device to supply power to the host device. The third interface can serve as a unidirectional power interface capable of receiving electrical signals from a power supply device to supply power to the load device and / or the host device.

[0091] It should be understood that the above situations can correspond to the three access sequences of (12, 13, 11), (13, 12, 11), and (13, 11, 12) mentioned above. For the access sequences of (12, 13, 11) and (13, 12, 11), before the first interface 11 is connected to the host device, the power supply device has already supplied power to the load device through the second power transmission path. After the first interface 11 is connected to the host device, the power supply device can supply power to the load device and the host device at the same time, thereby meeting the power supply needs of both at the same time. For the access sequence of (13, 11, 12), after the first interface 11 is connected to the host device, power can be supplied to the host device through the third power transmission path. After that, after the second interface 12 is connected to the load device, the power supply device can supply power to the host device and the load device at the same time, thereby meeting the power supply needs of both at the same time.

[0092] Optionally, the third power transmission path may be a power transmission path independent of the first power transmission path and / or the second power transmission path. In other words, the third power transmission path may not have any mutually usable circuit structure with the second power transmission path and / or the first power transmission path.

[0093] In other optional embodiments, the third power transmission path may be connected to the first power transmission path and / or the second power transmission path, or may not be an independent power transmission path. In other words, there may be a circuit structure that is mutually usable between the third power transmission path and the second power transmission path and / or the first power transmission path. This is conducive to the full utilization of circuit structure resources. For example, it can be combined with Figure 3 and Figure 4 As shown for understanding.

[0094] In some optional embodiments, when the third interface 13 is not connected to the power supply device, if the first interface 11 is connected to the host device, the control unit 10 obtains power from the host device through the first interface 11; if the third interface 13 is connected to the power supply device, the control unit 10 obtains power from the power supply device through the third interface 13.

[0095] Based on this, the control unit 10 can effectively power the load device under various access sequences of the multimedia switching device 100, thereby achieving normal operation and ensuring the normal operation of the multimedia switching device 100.

[0096] The specific circuit structure for powering the control unit 10 in the multimedia switching device 100 is not limited here. In some optional embodiments, the host device can directly power the control unit 10 through the first interface 11, or the power supply device can directly power the control unit 10 through the third interface 13. In other optional embodiments, refer to Figure 4 In the circuit structure shown, the multimedia switching device 100 may further include a second step-down unit 25, and the control unit 10 is connected between the first step-down unit 21 and the first adjustment unit 22 via the second step-down unit 25. For example, the working power interface of the control unit 10 is connected to the second step-down unit 25, so that the control unit 10 can receive the electrical signal output by the second step-down unit 25. The second step-down unit 25 can further step-down the electrical signal obtained after the step-down process by the first step-down unit 21, and power the control unit 10 through the further step-down electrical signal. For example, referring to Figure 4 As shown, the host device can power the control unit 10 through the first interface 11, the first step-down unit 21, and the second step-down unit 25, while the power supply device can power the control unit 10 through the third interface 13, the second adjustment unit 23, the first step-down unit 21, and the second step-down unit 25.

[0097] It should be understood that in the above-described optional embodiment of the present application, the use of two step-down units (i.e., the first step-down unit 21 and the second step-down unit 25) can meet the different operating voltage requirements of the control unit 10 and the load device. For example, the operating voltage required by the control unit 10 can generally be lower than the operating voltage required by the load device. Therefore, the above-described circuit structure can simultaneously meet the power supply voltage requirements of both the control unit 10 and the load device, thereby improving the power supply effect.

[0098] For example, the operating voltage required by the load device may be approximately 5V, while the operating voltage required by the control unit 10 may be approximately 3.3V. Of course, this example is only one currently used example, and the specific operating voltage can be set as needed. The voltage reduction process will be further explained below with reference to this example.

[0099] For example, as described above in the optional embodiment, refer to Figure 4As shown, the voltage value of the first power signal output by the host device can be between 5V and 20V. When the host device is used to power the control unit 10 and the load device, the first step-down unit 21 can perform a first step-down on the 5V to 20V electrical signal, stabilizing it to approximately 5V. The second step-down unit 25 then performs a second step-down on the 5V obtained after the first step-down, stabilizing it to approximately 3.3V. The control unit 10 receives the 3.3V power supply and can enter normal operation. In addition, the first adjustment unit 22 can obtain the approximately 5V electrical signal obtained after the first step-down and adaptively adjust it under the control of the control unit 10, outputting an output power signal for powering the load device, thereby powering the load device and enabling the load device to enter operation.

[0100] For example, as the optional embodiment described above, refer to Figure 4 As shown, the voltage value of the second power signal output by the power supply device can be between 5V and 20V. When the power supply device is used to power the control unit 10 and the load device, the voltage value of the electrical signal output by the second adjustment unit 23 can also be between 5V and 20V. The first step-down unit 21 performs a first step-down on the 5V to 20V electrical signal obtained from the second adjustment unit 23, thereby stabilizing it to approximately 5V. The second step-down unit 25 then performs a second step-down on the 5V obtained after the first step-down, thereby stabilizing it to approximately 3.3V. The control unit 10 receives the 3.3V power supply and can enter a normal operating state. In addition, the first adjustment unit 22 can obtain the approximately 5V electrical signal obtained after the first step-down and adaptively adjust it under the control of the control unit 10, outputting an output power signal for powering the load device, thereby powering the load device and enabling the load device to enter an operating state.

[0101] The specific circuit structure of the second step-down unit 25 is not limited herein. Optionally, the second step-down unit 25 may include a DC-DC step-down converter circuit (i.e., a DC-DC Buck circuit). For example, in one embodiment, a DC-DC Buck circuit with a 3.3V output may be used. Using a DC-DC Buck circuit for voltage reduction offers the advantages of high efficiency, stable output, simple control, and low cost.

[0102] In some optional embodiments, after the first interface 11 is connected to the host device, when the third interface 13 is connected to the power supply device, the host device switches from supplying power externally through the first interface 11 to receiving power through the first interface 11, so as to stop supplying power to the load device through the first interface 11, and obtain power from the power supply device through the third interface 13.

[0103] In some optional embodiments, the control unit 10 is further configured to: after the first interface 11 is connected to the host device, in response to the third interface 13 being connected to the power supply device, send a switching signal to the host device through the first interface 11, so that the host device switches from supplying power externally through the first interface 11 to receiving power through the first interface 11 based on the switching signal, so as to stop supplying power to the load device through the first interface 11, and obtain power from the power supply device through the third interface 13.

[0104] Based on this, the multimedia adapter 100 can utilize the power supply device connected to the third interface 13 to power the load device connected to the second interface 12 while also powering the host device connected to the first interface 11, thereby ensuring that both the load device and the host device can operate through the power provided by the power supply device, improving the battery life of at least one of the host device and the load device, ensuring the use effect of the load device such as the head-mounted display device, and avoiding the situation where the host device outputs power and receives power through the first interface 11 at the same time, avoiding electrical signal conflicts, and facilitating better power supply to the host device through the multimedia adapter 100.

[0105] Optionally, when the host device and the load device are powered by the powered device, they can be charged according to their own charging characteristics to facilitate subsequent use.

[0106] In some optional embodiments, referring to Figure 4 As shown, the first power transmission path further includes a first switch unit 24 with a body diode. The first switch unit 24 is connected between the first interface 11 and the first step-down unit 21, and the first switch unit 24 is connected to the control unit 10.

[0107] In some optional embodiments, in the multimedia switching device 100, if the third interface 13 is not connected to the power supply device, when the first interface 11 is connected to the host device, the control unit 10 can obtain power from the host device through the body diode of the first switch unit 24 and the first interface 11, and after obtaining power from the host device, control the first switch unit 24 and the first adjustment unit 22 to be turned on to make the first power transmission path conductive.

[0108] In some optional embodiments, the control unit 10 is further configured to: if the third interface 13 is not connected to the power supply device, in response to the first interface 11 being connected to the host device, obtain power from the host device through the body diode of the first switch unit 24 and the first interface 11, and, after obtaining power from the host device, control the first switch unit 24 and the first adjustment unit 22 to be turned on so that the first power transmission path is turned on.

[0109] Based on this, through the body diode of the first switch unit 24, the host device connected to the first interface 11 can effectively power the control unit 10 when the third interface 13 is not connected to the power supply device, thereby facilitating the control unit 10 to control the first switch unit 24 to be turned on, so as to control the first power transmission path to be turned on, thereby realizing the power supply from the host device to the load device through the multimedia switching device 100, thereby effectively improving the multimedia switching effect.

[0110] Optionally, an anode and a cathode of a body diode of the first switch unit 24 are connected to the first interface 11 and the first step-down unit 21 respectively.

[0111] Optionally, refer to Figure 4 As shown, the first switch unit 24 can be a PMOS tube with a body diode. It should be noted that the body diode can be a parasitic element of the PMOS tube. When a large instantaneous reverse current is generated in the circuit, it can be conducted out through the body diode so as not to break down the PMOS tube. The drain of the first switch unit 24 is connected to the first interface 11, the source of the first switch unit 24 is connected to the first step-down unit 21, and the gate of the first switch unit 24 is connected to the control unit 10. The anode and cathode of the body diode of the first switch unit 24 are respectively connected to the drain and source of the first switch unit 24. The control unit 10 can turn on the first switch unit 24 (PMOS tube) by outputting a low-level signal to the gate of the first switch unit 24. Optionally, as Figure 4 As shown, the gate of the first switch unit 24 can be connected to a GPIO (General-Purpose Input / Output) port of the control unit 10. Of course, this is only an example connection method, and other connection methods can also be used.

[0112] In the above embodiment of the present application, corresponding to the access sequence of (11, 12, 13), (12, 11, 13), (11, 13, 12), by setting the above first switch unit 24, when the power supply device is not connected to the third interface 13, when the host device is connected to the first interface 11, the host device can supply power to the control unit 10 through the first switch unit 24 (for example, through its body diode), so that the control unit 10 can first enter the working state. Afterwards, the control unit 10 that first enters the working state can control the first switch unit 24 (PMOS tube) to turn on, and then the host device supplies power to the control unit 10 through the turned-on first switch unit 24, thereby facilitating the continued operation of the control unit 10, so as to control the operation of the multimedia switching device 100.

[0113] It should be understood that the first switch unit 24 switches off the electrical signal and does not affect the multimedia transmission path between the host device and the load device.

[0114] The specific circuit structure forming the third power transmission path is not limited here. For example, in some optional embodiments, referring to Figure 4 As shown, the third power transmission path may include a first switch unit 24 and a second adjustment unit 23 .

[0115] In some optional embodiments, in the multimedia switching device 100, if the third power transmission path is conductive, the second adjustment unit 23 can receive the second power signal obtained by the third interface 13 from the power supply device, and output a second adjusted electrical signal to power the host device through the first switch unit 24 and the first interface 11. Optionally, the second adjusted electrical signal can be an electrical signal obtained by the second adjustment unit 23 after adjusting the second power signal obtained by the third interface 13 from the power supply device, and the host device can be powered by the second adjusted electrical signal.

[0116] In some optional embodiments, if the third power transmission path is turned on, the control unit 10 controls the second adjustment unit 23 to adjust the second power signal obtained by the third interface 13 from the power supply device, and supplies power to the host device through the first switch unit 24 and the first interface 11 based on the adjusted electrical signal.

[0117] Based on this, through the above-mentioned optional embodiments, the multimedia adapter 100 can effectively power the host device when the third power transmission path is turned on, and the second adjustment unit 23 of the multimedia adapter 100 can dynamically adjust the power supply of the host device to the first interface 11. This can better adapt to the power supply requirements of the load device in different scenarios, and can also avoid the disadvantage of affecting the normal operation of the target device due to inappropriate output power of the power supply device providing power (for example, parameters are too high or too low, etc.).

[0118] For example, after the first interface 11 is connected to the host device, if the third interface 13 is connected to the power supply device, the third power transmission path is turned on. Since the anode and cathode of the body diode of the first switch unit 24 can be connected to the first interface 11 and the first step-down unit 21 respectively, when the first switch unit 24 is turned off, the electrical signal output by the power supply device connected to the third interface 13 to the first interface 11 through the third power transmission path cannot be reversely instantaneously conducted through the body diode, thereby ensuring that the host device can properly switch from external power supply to receiving power through the first interface 11 based on the switching signal, thereby ensuring that the power supply device can conveniently power the host device through the third power transmission path after the first switch unit 24 is turned on.

[0119] In some optional embodiments, referring to Figure 4As shown, the multimedia adapter 100 may further include a charging controller 27 and a second switch unit 28. The second switch unit 28 is connected between the third interface 13 and the second adjustment unit 23. The charging controller 27 is connected to the second switch unit 28 and the control unit 10. The charging controller 27 is also connected to the third interface 13. When a power supply device is connected to the third interface 13, the charging controller 27 may conduct a charging negotiation with the power supply device. After the charging negotiation, the charging controller 27 controls the second switch unit 28 to conduct, thereby enabling the second adjustment unit 23 to obtain the second power signal provided by the power supply device connected to the third interface 13 through the conducting second switch unit 28.

[0120] The charging controller 27 can be based on any standard charging protocol. For example, the standard charging protocol can be the PD (Power Delivery) protocol or the QC (Quick Charge) protocol. For example, taking the PD protocol or the QC protocol as an example, the charging controller 27 can include a PD protocol chip or a QC protocol chip.

[0121] The second switch unit 28 can be any switch device. For example, it can be a transistor, a MOS tube, etc. Figure 4 As shown, the second switch unit 28 can be a PMOS tube. The source of the second switch unit 28 is connected to the third interface 13, the drain of the second switch unit 28 is connected to the second adjustment unit 23, and the gate of the second switch unit 28 is connected to the charging controller 27. For example, the charging controller 27 can output a low-level signal to the gate of the second switch unit 28 (PMOS tube) to turn on the second switch unit 28. For example, the second switch unit 28 can also have a body diode, and the anode and cathode of the body diode are respectively connected to the drain and source of the second switch unit 28. It should be noted that the body diode can be a parasitic element of the PMOS tube. When a large instantaneous reverse current is generated in the circuit, it can be conducted through this body diode so as not to break down the PMOS tube.

[0122] For example, refer to Figure 4 As shown, the charging controller 27 can be connected to the control unit 10 via an I2C (Inter-Integrated Circuit) bus. The I2C bus may include an SCL line (Serial Clock Line) and an SDA line (Serial Data Line), so that the charging controller 27 transmits data to the control unit 10 via the I2C bus. Of course, this is only an example connection method and does not limit the embodiments of the present application.

[0123] For example, refer to Figure 4 As shown, the control unit 10 can communicate with the first interface 11 (USB Type-C interface) through the CC pin (for example Figure 4 The control unit 10 can be connected to the second interface 12 (USB Type-C interface) through the CC pin (eg Figure 4 The charging controller 27 can be connected to the third interface 13 (USB Type-C interface) through the CC pin (for example Figure 4 The CC4 and CC5 in the figure are connected, and the PD charging protocol can be implemented through the CC pin. Of course, this is only an example connection method and does not limit the embodiments of the present application.

[0124] In some optional embodiments, combined with Figure 4 As shown, an optional circuit structure of the multimedia switching device 100 according to an embodiment of the present application is generally described.

[0125] Reference Figure 4 As shown, the multimedia adapter 100 may include a control unit 10, a first interface 11, a second interface 12, and a third interface 13. The first interface 11 is used to connect to a host device HOST, the second interface 12 is used to connect to a load device LOAD, and the third interface 13 is used to connect to a power supply device Charger. The multimedia adapter 100 may also include a first step-down unit 21, a first adjustment unit 22, a second adjustment unit 23, a first switch unit 24, a second step-down unit 25, a cross switch 26, a charging controller 27, and a second switch unit 28. The first step-down unit 21 and the second step-down unit 25 each include a DC-DC Buck circuit, and the second adjustment unit 23 includes a DC-DC Buck Boost circuit. The control unit 10 may include a first analog-to-digital conversion module ADC1, a second analog-to-digital conversion module ADC2, and a third analog-to-digital conversion module ADC3. The multimedia adapter 100 also includes a detection unit, which may include a first voltage detection module 31, a second voltage detection module 32, and a third voltage detection module 33. Between the second interface 12 and the first interface 11, a multimedia transmission path for transmitting multimedia data from the host device HOST to the load device LOAD and a first power transmission path for transmitting the power signal from the host device HOST to the load device LOAD can be included. Between the third interface 13 and the second interface 12, a second power transmission path for transmitting the power signal from the power supply device Charger to the load device LOAD can be included. Between the third interface 13 and the first interface 11, a third power transmission path for transmitting the power signal from the power supply device Charger to the host device HOST can be included.

[0126] like Figure 4As shown, the first switch unit 24 can be a PMOS tube with a body diode. The drain of the first switch unit 24 is connected to the first interface 11, the source of the first switch unit 24 is connected to the first step-down unit 21, the gate of the first switch unit 24 is connected to the control unit 10, and the anode and cathode of the body diode of the first switch unit 24 can be connected to the drain and source of the first switch unit 24 respectively. The first step-down unit 21 can be connected to the first adjustment unit 22, and the second adjustment unit 23 can be connected to the second interface 12. The control unit 10 is connected to the electrical connection line between the first step-down unit 21 and the first adjustment unit 22 through the second step-down unit 25. As shown Figure 4 In the circuit structure shown, the first power transmission path includes the first switch unit 24, the first step-down unit 21, and the first adjustment unit 22. The control unit 10 can control the first power transmission path to be conductive, so that the host device HOST supplies power to the load device LOAD through the first power transmission path.

[0127] like Figure 4 As shown, the second switch unit 28 can be a PMOS tube. The source of the second switch unit 28 can be connected to the third interface 13, the drain of the second switch unit 28 can be connected to the second adjustment unit 23, and the gate of the second switch unit 28 can be connected to the charge controller 27. The second switch unit 28 has a body diode, and the anode and cathode of the body diode can be connected to the drain and source of the second switch unit 28 respectively. The charge controller 27 is also connected to the control unit 10 and the third interface 13. Figure 4 In the illustrated circuit structure, the second power transmission path may include the aforementioned second switch unit 28, second adjustment unit 23, and first adjustment unit 22. The third power transmission path may include the aforementioned second switch unit 28, second adjustment unit 23, and first switch unit 24. The control unit 10 may control the second power transmission path to be conductive, so that the power supply device Charger supplies power to the load device LOAD via the second power transmission path. The control unit 10 may also control the third power transmission path to be conductive, so that the power supply device Charger supplies power to the host device HOST via the third power transmission path.

[0128] like Figure 4 As shown, the cross switch 26 is connected between the first interface 11 and the second interface 12, and the cross switch 26 can be connected to the control unit 10. The cross switch 26 is connected to the control unit 10, and at least one multimedia transmission path (such as Figure 4The control unit 10 can control at least one multimedia transmission path to be connected, so that the host device HOST transmits multimedia data to the load device LOAD through the at least one multimedia transmission path.

[0129] like Figure 4 As shown, the first voltage detection module 31 includes a first resistor R1 and a second resistor R2. The first end of the first resistor R1 is connected to the first interface 11 via the first switch unit 24 (PMOS transistor), the second end of the first resistor R1 is connected to the first end of the second resistor R2, and the second end of the second resistor R2 is grounded. The first analog-to-digital conversion module ADC1 of the control unit 10 is connected to the electrical connection line between the second end of the first resistor R1 and the first end of the second resistor R2. The second voltage detection module 32 includes a third resistor R3 and a fourth resistor R4. The first end of the fourth resistor R4 is connected to the second interface 12, the second end of the fourth resistor R4 is connected to the first end of the third resistor R3, and the second end of the third resistor R3 is grounded. The second analog-to-digital conversion module ADC2 of the control unit 10 is connected to the electrical connection line between the second end of the fourth resistor R4 and the first end of the third resistor R3. The third voltage detection module 33 includes a fifth resistor R5 and a sixth resistor R6, the first end of the sixth resistor R6 is connected to the third interface 13, the second end of the sixth resistor R6 is connected to the first end of the fifth resistor R5, and the second end of the fifth resistor R5 is grounded. The third analog-to-digital conversion module ADC3 of the control unit 10 is connected to the electrical connection line between the second end of the sixth resistor R6 and the first end of the fifth resistor R5.

[0130] It is understandable that in the working process exemplified below, the voltage of the first power signal that can be output by the host device HOST is between 5V and 20V, the voltage of the second power signal that can be output by the power supply device Charger is between 5V and 20V, the power supply voltage required by the load device LOAD is 5V, and the control unit 10 is an MCU and the required power supply voltage is 3.3V. Here, the load device LOAD can be explained as a head-mounted display device (taking AR glasses as an example), the host device HOST is the host end of the head-mounted display device, and the power supply device Charger is the charger of the head-mounted display device.

[0131] The following is the above Figure 4 The working process of some exemplary access sequences of the multimedia switching device 100 is described as follows:

[0132] Working process 1 (corresponding to the access sequence of (11, 12, 13)): The host device HOST first connects to the first interface 11. The host device HOST supplies power to the control unit 10 through the body diode of the first switch unit 24 (PMOS tube), the first buck unit 21, and the second buck unit 25 to start the control unit 10. After the control unit 10 is started, it monitors the device access status of each interface in real time. When the control unit 10 monitors that the load device LOAD is connected to the second interface 12, the control unit 10 can control the first power transmission path (including the first switch unit 24, the first buck unit 21, and the first adjustment unit 22) to be turned on, and the host device HOST supplies power to the load device LOAD through the first power transmission path. The control unit 10 controls at least one multimedia transmission path of the cross switch 26 to be turned on, and the host device HOST transmits multimedia data to the load device LOAD through the multimedia transmission path. When the control unit 10 detects that the power supply device Charger is connected to the third interface 13, it can send a switching signal to the host device HOST via the first interface 11, causing the host device HOST to switch from supplying power through the first interface 11 to receiving power through the first interface 11 based on the switching signal. This causes the host device HOST to stop supplying power to the load device LOAD through the first interface 11 and instead receive power from the power supply device Charger via the third interface 13. After completing charging negotiation with the power supply device Charger via the PD charging protocol, the charging controller 27 controls the second switch unit 28 to conduct. The control unit 10 can control the second adjustment unit 23 and the first adjustment unit 22 to conduct, thereby enabling the second power transmission path, allowing the power supply device Charger to supply power to the load device LOAD via the second power transmission path. This switches the power supply path for the load device LOAD from the first power transmission path to the second power transmission path, switching the device supplying power to the load device from the host device HOST to the power supply device Charger. Furthermore, the control unit 10 controls the second adjustment unit 23 and the first switch unit 24 to conduct, thereby enabling the third power transmission path, allowing the power supply device Charger to supply power to the host device HOST via the third power transmission path. Thus, the multimedia switching and power supply requirements of the multimedia switching device 100 are met.

[0133] Working process 2 (corresponding to the access sequence of (12, 11, 13)): The load device LOAD is first connected to the second interface 12. At this time, the multimedia switching device 100 and the load device LOAD are not working. When the host device HOST is connected to the first interface 11, the host device HOST supplies power to the control unit 10 through the body diode of the first switch unit 24 (PMOS tube), the first buck unit 21, and the second buck unit 25 to start the control unit 10. After the control unit 10 is started, it monitors the device access status of each interface in real time. Since the second interface 12 has been connected to the load device LOAD before, the control unit 10 can control the first switch unit 24, the first buck unit 21, and the first adjustment unit 22 to turn on, so that the first power transmission path is turned on, and the host device HOST supplies power to the load device LOAD through the first power transmission path. The control unit 10 controls at least one multimedia transmission path of the cross switch 26 to turn on, and the host device HOST transmits multimedia data to the load device LOAD through the multimedia transmission path. When the control unit 10 detects that the power supply device Charger is connected to the third interface 13, it can send a switching signal to the host device HOST via the first interface 11, causing the host device HOST to switch from supplying power externally through the first interface 11 to receiving power through the first interface 11 based on the switching signal. This causes the host device HOST to stop supplying power to the load device LOAD via the first interface 11 and instead receive power from the power supply device Charger via the third interface 13. After completing charging negotiation with the power supply device Charger via the PD charging protocol, the charging controller 27 controls the second switch unit 28 to conduct. The control unit 10 can control the second adjustment unit 23 and the first adjustment unit 22 to conduct, thereby conducting the second power transmission path, thereby enabling the power supply device Charger to supply power to the load device LOAD via the second power transmission path. This switches the power supply path of the load device LOAD from the first power transmission path to the second power transmission path, switching the device supplying power to the load device from the host device HOST to the power supply device Charger. Furthermore, the control unit 10 controls the third power transmission path (including the second switch unit 28, the second adjustment unit 23, and the first switch unit 24) to be conductive, so that the power supply device Charger supplies power to the host device HOST through the third power transmission path. This satisfies the multimedia switching and power supply requirements of the multimedia switching device 100.

[0134] Working process 3 (corresponding to the access sequence of (12, 13, 11)): The load device LOAD is first connected to the second interface 12. At this time, the multimedia switching device 100 and the load device LOAD are not working. When the power supply device Charger is connected to the third interface 13, the charging controller 27 conducts charging negotiation with the power supply device Charger through the PD charging protocol. After the negotiation is completed, the charging controller 27 controls the second switch unit 28 to be turned on, and the power supply device Charger supplies power to the control unit 10 through the second switch unit 28, the second adjustment unit 23, the first step-down unit 21, and the second step-down unit 25 to start the control unit 10. After the control unit 10 is started, it monitors the device access status of each interface in real time. Since the second interface 12 has been connected to the load device LOAD before, the control unit 10 can control the second adjustment unit 23 and the first adjustment unit 22 to be turned on, so that the second power transmission path is turned on, so that the power supply device Charger supplies power to the load device LOAD through the second power transmission path. When the control unit 10 detects that the host device HOST is connected to the first interface 11, it controls the second adjustment unit 23 and the first step-down unit 21 to conduct, thereby activating the third power transmission path. The power supply device Charger then supplies power to the host device HOST via the third power transmission path. Furthermore, the control unit 10 controls at least one multimedia transmission path of the crossbar switch 26 to activate, allowing the host device HOST to transmit multimedia data to the load device LOAD via the multimedia transmission path. This satisfies the multimedia switching and power supply requirements of the multimedia switching device 100.

[0135] Operation 4 (corresponding to the access sequence (13, 12, 11)): The power supply device Charger first connects to the third interface 13. The charging controller 27 conducts charging negotiation with the power supply device Charger using the PD charging protocol. After the negotiation is complete, the charging controller 27 controls the second switch unit 28 to turn on. The power supply device Charger supplies power to the control unit 10 via the second switch unit 28, the second adjustment unit 23, the first step-down unit 21, and the second step-down unit 25, thereby starting the control unit 10. After starting, the control unit 10 monitors the device access status of each interface in real time. If the control unit 10 detects that the load device LOAD is connected to the second interface 12, the control unit 10 can control the second adjustment unit 23 and the first adjustment unit 22 to enable the second power transmission path, thereby allowing the power supply device Charger to supply power to the load device LOAD through the second power transmission path. If the control unit 10 detects that the host device HOST is connected to the first interface 11, the control unit 10 can control the second adjustment unit 23 and the first step-down unit 21 to turn on, thereby enabling the third power transmission path, and the power supply device Charger supplies power to the host device HOST through the third power transmission path. Furthermore, the control unit 10 controls at least one multimedia transmission path of the cross switch 26 to be turned on, and the host device HOST transmits multimedia data to the load device LOAD through the multimedia transmission path, thereby meeting the multimedia switching and power supply requirements of the multimedia switching device 100 .

[0136] Working process 5 (corresponding to the access sequence of (11, 13, 12)): The host device HOST first connects to the first interface 11. The host device HOST supplies power to the control unit 10 through the body diode of the first switch unit 24 (PMOS tube), the first buck unit 21, and the second buck unit 25 to start the control unit 10. After the control unit 10 is started, it monitors the device access status of each interface in real time. The control unit 10 monitors that the power supply device Charger is connected to the third interface 13. It can send a switching signal to the host device HOST through the first interface 11, so that the host device HOST switches from supplying power externally through the first interface 11 to receiving power through the first interface 11 based on the switching signal. The control unit 10 controls the second adjustment unit 23 and the first buck unit 21 to turn on, so that the third power transmission path is turned on, and the power supply device Charger supplies power to the host device HOST through the third power transmission path. When the control unit 10 detects that the load device LOAD is connected to the second interface 12, it controls the second adjustment unit 23 and the first adjustment unit 22 to conduct, thereby activating the second power transmission path. This allows the power supply device Charger to supply power to the load device LOAD via the second power transmission path. Furthermore, the control unit 10 controls at least one multimedia transmission path of the crossbar switch 26 to activate, allowing the host device HOST to transmit multimedia data to the load device LOAD via the multimedia transmission path. This satisfies the multimedia switching and power supply requirements of the multimedia switching device 100.

[0137] Operation 6 (corresponding to the access sequence (13, 11, 12)): The power supply device Charger first connects to the third interface 13. The charging controller 27 conducts charging negotiation with the power supply device Charger using the PD charging protocol. After the negotiation is complete, the charging controller 27 controls the second switch unit 28 to turn on. The power supply device Charger supplies power to the control unit 10 via the second switch unit 28, the second adjustment unit 23, the first step-down unit 21, and the second step-down unit 25, thereby starting the control unit 10. After starting, the control unit 10 monitors the device access status of each interface in real time. If the control unit 10 detects that the host device HOST is connected to the first interface 11, the control unit 10 can control the second adjustment unit 23 and the first step-down unit 21 to turn on, thereby opening the third power transmission path. The power supply device Charger then supplies power to the host device HOST via the third power transmission path. If the control unit 10 detects that the load device LOAD is connected to the second interface 12, the control unit 10 can control the second adjustment unit 23 and the first adjustment unit 22 to turn on, thereby opening the second power transmission path. This allows the power supply device Charger to supply power to the load device LOAD via the second power transmission path. Furthermore, the control unit 10 controls at least one multimedia transmission path of the cross switch 26 to be turned on, and the host device HOST transmits multimedia data to the load device LOAD through the multimedia transmission path, thereby meeting the multimedia switching and power supply requirements of the multimedia switching device 100 .

[0138] From the working modes of the multimedia switching device 100 and the electronic devices connected to its interfaces in the above-mentioned various working modes, it can be seen that any access order of the first interface 11, the second interface 12 and the third interface 13 can make the multimedia switching device 100 and the load device connected thereto work normally, and the load device can obtain power from the third interface 13 and obtain multimedia data signals from the first interface 11. Optionally, the host device connected to the first interface 11 can also obtain power from the third interface 13. It should be understood that the above description of Figure 4 The circuit structure and working mode are described as examples only and are not intended to limit the embodiments of the present application.

[0139] According to the second aspect of the embodiment of the present application, referring to Figure 5 As shown, a multimedia system is also provided, comprising: a multimedia switching device 100 as any one of the first aspects, a host device, a load device and a power supply device, wherein the host device is connected to the first interface 11 of the multimedia switching device 100, the load device is connected to the second interface 12 of the multimedia switching device 100, and the power supply device is connected to the third interface 13 of the multimedia switching device 100.

[0140] It should be understood that since the multimedia switching device 100 in the multimedia system adopts the multimedia switching device 100 in the first aspect, the multimedia switching device 100 has better performance and can better adapt to the multimedia switching needs of electronic devices (i.e., load devices) including but not limited to head-mounted display devices. Therefore, the multimedia system can also have better performance and can better adapt to user needs.

[0141] The term "including" and its variations used in this document are open inclusions, that is, "including but not limited to". The term "based on" means "based at least in part on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments". It should be noted that the concepts of "first", "second", etc. mentioned in this application are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units. It should be noted that the modifications of "one" and "a plurality of" mentioned in this application are illustrative rather than restrictive. Those skilled in the art should understand that unless the context clearly indicates otherwise, it should be understood as "one or more".

[0142] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present application, and not to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A multimedia switching device, comprising: a first interface configured to connect to a host device; The second interface is configured to connect to a load device; a multimedia transmission path, provided between the first interface and the second interface, for transmitting multimedia data from the host device to the load device; wherein the multimedia transmission path is configured to be conductive when both the first interface and the second interface are connected to corresponding devices; a first power transmission path, provided between the first interface and the second interface, for transmitting a power signal of a host device to the load device; A third interface is configured to connect to a power supply device; A second power transmission path is provided between the second interface and the third interface, and is used to transmit the power signal of the power supply device to the load device; Among them, in the case that the third interface is the interface of the last connected device, when the power supply device is connected to the third interface, the power supply path of the load device is switched from the first power transmission path to the second power transmission path, so that the device supplying power to the load device is switched from the host device to the power supply device.

2. The device according to claim 1, wherein In a case where the first interface is the interface of the last access device, when the host device is connected to the first interface, the multimedia transmission path is connected.

3. The device according to claim 1, wherein In a case where the second interface is the last interface to be connected to the device, when the load device is connected to the second interface, the multimedia transmission path and the second power transmission path are connected.

4. The device according to claim 1, wherein The apparatus further includes a control unit. When at least one of the first interface and the third interface is connected to a corresponding device, the control unit is started and monitors the device status of the first interface, the second interface, and the third interface.

5. The device according to any one of claims 1 to 4, wherein: The first power transmission path includes a first voltage reduction unit and a first adjustment unit; The first voltage reduction unit is connected between the first interface and the first adjustment unit, and the first adjustment unit is connected to the second interface; When the first power transmission path is turned on, the first step-down unit is used to step down the first power signal obtained by the first interface from the host device, the first adjustment unit receives the electrical signal obtained after the step-down, and outputs the output power signal to the second interface to power the load device through the second interface.

6. The device according to claim 5, wherein The second power transmission path includes a second adjustment unit, the first voltage reduction unit and the first adjustment unit; A first end of the second adjustment unit is connected to the third interface, and a second end of the second adjustment unit is connected between the first interface and the first step-down unit; When the second power transmission path is turned on, the second adjustment unit receives the second power signal obtained by the third interface from the power supply device, and outputs a first adjustment electrical signal to the first step-down unit. The first step-down unit steps down the first adjustment electrical signal. The first adjustment unit receives the stepped-down first adjustment electrical signal and outputs an output power signal to the second interface to power the load device through the second interface.

7. The device according to claim 6, wherein A third power transmission path is provided between the third interface and the first interface for transmitting a power signal of the power supply device to the host device; If the third interface is connected to the corresponding device before the first interface, when the host device is connected to the first interface, the third power transmission path is connected, so that the power supply device supplies power to the host device through the third power transmission path.

8. The device according to claim 7, wherein The device further includes a control unit configured to control at least one of the multimedia transmission path, the first power transmission path, and the second power transmission path; and, In a case where the third interface is not connected to the power supply device, if the first interface is connected to the host device, the control unit obtains power from the host device through the first interface; If the third interface is connected to the power supply device, the control unit obtains power from the power supply device through the third interface.

9. The device according to claim 7, wherein After the first interface is connected to the host device, when the third interface is connected to the power supply device, the host device switches from supplying power externally through the first interface to receiving power through the first interface, so as to stop supplying power to the load device through the first interface and obtain power from the power supply device through the third interface.

10. The device according to claim 8, wherein The first power transmission path further includes a first switch unit with a body diode, the first switch unit is connected between the first interface and the first step-down unit, and the first switch unit is connected to the control unit; If the third interface is not connected to the power supply device, when the first interface is connected to the host device, the control unit obtains power from the host device through the body diode of the first switch unit and the first interface, and after obtaining power from the host device, controls the first switch unit and the first adjustment unit to be turned on to make the first power transmission path conductive.

11. The device according to claim 10, wherein The third power transmission path includes the first switch unit and the second adjustment unit; If the third power transmission path is turned on, the second adjustment unit receives the second power signal obtained by the third interface from the power supply device, and outputs a second adjustment electrical signal to power the host device through the first switch unit and the first interface.

12. The device according to any one of claims 1 to 4, wherein: The multimedia switching device further includes a cross switch connected between the first interface and the second interface. The cross switch is connected to a control unit. At least one multimedia transmission path is formed between the cross switch and the first interface and the second interface.

13. A multimedia system comprising: The multimedia switching device, host device, load device and power supply device as described in any one of claims 1 to 12, wherein the host device is connected to the first interface of the multimedia switching device, the load device is connected to the second interface of the multimedia switching device, and the power supply device is connected to the third interface of the multimedia switching device.

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