Multimedia interface bidirectional power supply circuit, control method and electronic device

Abstract

This invention discloses a bidirectional power supply circuit, control method, and electronic device for a multimedia interface, including a first power supply detection circuit, a port connection status detection circuit, a power path management circuit, a switching circuit, and a bidirectional voltage conversion circuit. The first power supply detection circuit detects the device's own power supply status, while the port connection status detection circuit detects the external device's connection status. Based on the dual detection results, the power path management circuit intelligently controls the switching circuit and the bidirectional voltage conversion circuit. This enables the device to supply power to external devices via the multimedia interface and also to draw power from external devices via the multimedia interface, meeting the bidirectional power supply requirements of the new multimedia interface. Through the coordinated control of the switching circuit and the bidirectional voltage conversion circuit, the correct conduction or shutdown of the power path is ensured when switching between the two power supply modes, avoiding the risk of backflow or short circuits and improving system safety.

Description

Technical Field

[0001] This invention relates to the field of multimedia interface power supply technology, and in particular to a bidirectional power supply circuit, control method and electronic device for a multimedia interface. Background Technology

[0002] With the development of multimedia interface technology, the new generation of high-speed digital multimedia interfaces has been endowed with multiple service capabilities, including audio and video transmission, data transmission, networking communication, control signaling interaction, and power supply. Among them, the bidirectional power supply function requires the device to be able to supply power to external devices through the interface and also to draw power from external devices through the interface, so as to realize multiple uses with one cable and simplify user operation.

[0003] However, existing multimedia interface power supply circuits have the following shortcomings: traditional interfaces typically only support unidirectional power supply or require additional power cables, failing to meet the needs of bidirectional power supply; although some interfaces support bidirectional power supply, their power supply circuit designs are primarily geared towards specific protocols and cannot be directly applied to new multimedia interfaces. More importantly, existing power supply circuits lack a comprehensive judgment mechanism for the device's own power supply status and the external device's access status, making it difficult to intelligently and safely switch the power supply direction according to actual usage scenarios. This results in unreliable power supply switching, potential safety hazards, and an inability to meet the bidirectional power supply functional requirements of next-generation multimedia interfaces. Summary of the Invention

[0004] This invention provides a bidirectional power supply circuit, control method, and electronic device for a multimedia interface, in order to solve the problem that in the prior art, the power supply circuit for the multimedia interface cannot intelligently switch the power supply direction according to the power supply status of the device itself and the access status of the external device, resulting in unreliable bidirectional power supply switching and potential safety hazards.

[0005] A bidirectional power supply circuit for a multimedia interface includes a first power supply detection circuit, a port connection status detection circuit, a power path management circuit, a switching circuit, and a bidirectional voltage conversion circuit. The input terminal of the first power supply detection circuit is used to connect to the motherboard power socket, and is used to detect the power supply status of the motherboard power socket and generate a first detection signal; The input terminal of the port connection status detection circuit is used to connect to the multimedia interface, and is used to detect whether the multimedia interface is connected to an external device and generate a second detection signal; The first input terminal of the power path management circuit is connected to the motherboard power socket, and the second input terminal of the power path management circuit is connected to the output terminal of the first power supply detection circuit and the output terminal of the port connection status detection circuit, respectively, for generating path control signals and mode control signals based on the first detection signal and the second detection signal; The switching circuit is connected in series between the motherboard power socket and the power pin of the multimedia interface. The control terminal of the switching circuit is connected to the first output terminal of the power path management circuit, and is used to turn on or off according to the path control signal. The first terminal of the bidirectional voltage conversion circuit is connected to the power pin of the multimedia interface, the second terminal of the bidirectional voltage conversion circuit is connected to the motherboard power network, and the control terminal of the bidirectional voltage conversion circuit is connected to the second output terminal of the power path management circuit, which is used to operate in the first mode or the second mode according to the mode control signal. When the first detection signal indicates that the motherboard power socket is powered and the second detection signal indicates that the multimedia interface is connected to an external device, the power path management circuit controls the switching circuit to be turned on and controls the bidirectional voltage conversion circuit to work in the first mode, so that the motherboard power socket outputs power to the power pin of the multimedia interface through the switching circuit. When the first detection signal indicates that the motherboard power socket is not powered and the second detection signal indicates that the multimedia interface is connected to an external device, the power path management circuit controls the switching circuit to turn off and controls the bidirectional voltage conversion circuit to work in the second mode, so that the power pin of the multimedia interface supplies power to the motherboard power network through the bidirectional voltage conversion circuit.

[0006] Furthermore, the switching circuit includes at least one MOSFET switch, the source of which is connected to the motherboard power socket, the drain of which is connected to the power pin of the multimedia interface, and the gate of which is connected to the first output terminal of the power path management circuit.

[0007] Furthermore, the bidirectional voltage conversion circuit includes a bidirectional buck-boost converter and a controller; The first end of the bidirectional buck-boost converter is connected to the power pin of the multimedia interface, and the second end of the bidirectional buck-boost converter is connected to the motherboard power network. The input terminal of the controller is connected to the second output terminal of the power path management circuit, and the output terminal of the controller is connected to the control terminal of the bidirectional buck-boost converter, for controlling the bidirectional buck-boost converter to operate in the first mode or the second mode according to the mode control signal.

[0008] Furthermore, the controller is a power transmission protocol controller.

[0009] Furthermore, the motherboard power network includes a voltage conversion module, the input terminal of which is connected to the second terminal of the bidirectional voltage conversion circuit, and the output terminal of which is used to connect to the internal functional modules of the motherboard.

[0010] Furthermore, the voltage conversion module includes a DDR power supply circuit, the output of which is used to connect to the DDR memory.

[0011] Furthermore, it also includes an enable control switch; The enable control switch is connected in series between the motherboard power socket and the motherboard power network; The control terminal of the enable control switch is connected to the output terminal of the first power supply detection circuit. When the first detection signal indicates that the motherboard power socket is not powered, the enable control switch is turned off to cut off the power supply path between the motherboard power socket and the motherboard power network.

[0012] A bidirectional power supply control method for a multimedia interface, applied in the aforementioned bidirectional power supply circuit for a multimedia interface, includes: The power supply status of the motherboard power connector is detected, and a first detection signal is generated; Detect whether the multimedia interface is connected to an external device and generate a second detection signal; Based on the first detection signal and the second detection signal, a path control signal and a mode control signal are generated; When the first detection signal indicates that the motherboard power socket is powered and the second detection signal indicates that the multimedia interface is connected to an external device, the switching circuit connected in series between the motherboard power socket and the power pin of the multimedia interface is turned on according to the path control signal, and the bidirectional voltage conversion circuit is controlled to work in the first mode according to the mode control signal, so that the motherboard power socket outputs power to the power pin of the multimedia interface. When the first detection signal indicates that the motherboard power socket is not powered and the second detection signal indicates that the multimedia interface is connected to an external device, the switching circuit is turned off according to the path control signal, and the bidirectional voltage conversion circuit is controlled to work in the second mode according to the mode control signal, so that the power pin of the multimedia interface supplies power to the motherboard power network through the bidirectional voltage conversion circuit.

[0013] An electronic device includes a multimedia interface, a motherboard power socket, a motherboard power network, and a bidirectional power supply circuit for the multimedia interface. The second terminal of the bidirectional voltage conversion circuit is connected to the motherboard power network, and the motherboard power network is connected to the internal functional modules of the motherboard.

[0014] Furthermore, the internal functional modules of the motherboard include at least one of DDR memory, main control SoC, and input / output interface circuitry.

[0015] This invention provides a bidirectional power supply circuit, control method, and electronic device for a multimedia interface. The bidirectional power supply circuit includes a first power supply detection circuit, a port connection status detection circuit, a power path management circuit, a switching circuit, and a bidirectional voltage conversion circuit. The first power supply detection circuit detects the device's own power supply status, and the port connection status detection circuit detects the external device's connection status. The power path management circuit intelligently controls the switching circuit and the bidirectional voltage conversion circuit based on the dual detection results. This enables the device to supply power to external devices via the multimedia interface and also to draw power from external devices via the multimedia interface, meeting the bidirectional power supply requirements of new multimedia interfaces. Through the coordinated control of the switching circuit and the bidirectional voltage conversion circuit, the correct conduction or shutdown of the power path is ensured when switching between the two power supply modes, avoiding the risk of backflow or short circuits and improving system safety. The modular design, with clear division of labor among the functional circuits, makes it suitable not only for specific multimedia interfaces but also for other multimedia interfaces requiring bidirectional power supply, exhibiting good versatility and scalability. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of a bidirectional power supply circuit for a multimedia interface in one embodiment of the present invention; Figure 2 This is a flowchart of a bidirectional power supply control method for a multimedia interface according to an embodiment of the present invention.

[0018] In the diagram: 1. Multimedia interface; 2. Motherboard power socket; 3. Motherboard power network; 4. Multimedia interface bidirectional power supply circuit; 41. First power supply detection circuit; 42. Port connection status detection circuit; 43. Power path management circuit; 44. Switch circuit; 45. Bidirectional voltage conversion circuit; 46. Enable control switch; 5. Internal functional modules of the motherboard. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] It should be understood that the invention can be embodied in various forms and should not be construed as being limited to the embodiments set forth herein. Rather, providing these embodiments will make the disclosure thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0021] To fully understand this invention, detailed structures and steps will be presented in the following description to illustrate the technical solution proposed by this invention. Preferred embodiments of the invention are described in detail below; however, in addition to these detailed descriptions, the invention may have other embodiments.

[0022] This embodiment provides a bidirectional power supply circuit 4 for a multimedia interface, such as... Figure 1 As shown, it includes a first power supply detection circuit 41, a port connection status detection circuit 42, a power path management circuit 43, a switching circuit 44, and a bidirectional voltage conversion circuit 45.

[0023] Exemplarily, the input terminal of the first power supply detection circuit 41 is connected to the motherboard power socket 2 to detect the power supply status of the motherboard power socket 2 and generate a first detection signal. Specifically, the motherboard power socket 2 is used to connect an external power adapter to provide main power to the device. When the external power adapter is plugged in and supplying power normally, the first detection signal is high, indicating that there is power; when the external power adapter is not plugged in or the power supply is abnormal, the first detection signal is low, indicating that there is no power. In this embodiment, the first power supply detection circuit 41 internally uses a low-voltage MOSFET to implement the signal level conversion function, converting the high voltage input of the motherboard power socket 2 into a logic level for use by subsequent circuits. In other embodiments, this level conversion function can also be implemented using a transistor or other switching elements.

[0024] For example, the input terminal of the port connection status detection circuit 42 is connected to the multimedia interface 1 to detect whether an external device is connected to the multimedia interface 1 and generate a second detection signal. Specifically, the multimedia interface 1 is a bidirectional power supply-supporting multimedia interface 1, such as a GPMI (General Purpose Multimedia Interface) interface. When an external device is plugged into the multimedia interface 1 via a cable, the second detection signal is high, indicating that an external device is connected; when no external device is connected, the second detection signal is low, indicating that no external device is connected.

[0025] For example, the first input terminal of the power path management circuit 43 is connected to the motherboard power socket 2, and the second input terminal of the power path management circuit 43 is connected to the output terminal of the first power supply detection circuit 41 and the output terminal of the port connection status detection circuit 42, respectively, for generating path control signals and mode control signals based on the first detection signal and the second detection signal. Specifically, the first input terminal of the power path management circuit 43 is connected to the motherboard power socket 2 for obtaining the main power supply.

[0026] For example, the switch circuit 44 is connected in series between the motherboard power socket 2 and the power pin of the multimedia interface 1. The control terminal of the switch circuit 44 is connected to the first output terminal of the power path management circuit 43, and is used to turn on or off according to the path control signal. Specifically, when the switch circuit 44 is turned on, the power of the motherboard power socket 2 can be directly delivered to the power pin of the multimedia interface 1 through the switch circuit 44; when the switch circuit 44 is turned off, the path is cut off.

[0027] For example, the first terminal of the bidirectional voltage conversion circuit 45 is connected to the power pin of the multimedia interface 1, the second terminal of the bidirectional voltage conversion circuit 45 is connected to the motherboard power network 3, and the control terminal of the bidirectional voltage conversion circuit 45 is connected to the second output terminal of the power path management circuit 43, for operating in either the first or second mode according to the mode control signal. In this embodiment, the bidirectional voltage conversion circuit 45 is controlled by a dedicated PD chip, which is a power transmission protocol controller. The dedicated PD chip generates corresponding drive signals to control the operating state of the bidirectional voltage conversion circuit 45 according to the mode control signal sent by the power path management circuit 43. The bidirectional voltage conversion circuit 45 has bidirectional voltage conversion capability, enabling bidirectional power flow and voltage adaptation conversion.

[0028] The working principle of this embodiment is as follows: Operating mode one is the external power supply mode. When the first detection signal indicates that the motherboard power socket 2 is receiving power and the second detection signal indicates that the multimedia interface 1 is connected to an external device, the power path management circuit 43 controls the switching circuit 44 to conduct and controls the bidirectional voltage conversion circuit 45 to operate in the first mode, so that the motherboard power socket 2 outputs power to the power pin of the multimedia interface 1 through the switching circuit 44. At this time, the electrical energy of the motherboard power socket 2 is directly delivered to the power pin of the multimedia interface 1 through the switching circuit 44 to power the external device. In the first mode, the bidirectional voltage conversion circuit 45 can be configured as needed to either pass-through mode or boost mode to adapt to the voltage requirements of the external device.

[0029] Operating mode two is the internal power supply mode. When the first detection signal indicates that the motherboard power socket 2 is not powered and the second detection signal indicates that the multimedia interface 1 is connected to an external device, the power path management circuit 43 controls the switch circuit 44 to turn off and controls the bidirectional voltage conversion circuit 45 to operate in the second mode, so that the power pins of the multimedia interface 1 supply power to the motherboard power network 3 through the bidirectional voltage conversion circuit 45. In the second mode, the bidirectional voltage conversion circuit 45 realizes the transmission of power from the multimedia interface 1 to the motherboard power network 3 through its internally integrated back-to-back MOSFET switching circuit, while preventing current backflow and ensuring system safety. At this time, the power pins of the multimedia interface 1 obtain power from the external device, and this power is delivered to the motherboard power network 3 after voltage conversion by the bidirectional voltage conversion circuit 45 to power the internal functional modules 5 of the motherboard. The bidirectional voltage conversion circuit 45 is usually configured in buck mode in the second mode to meet the voltage requirements of the internal functional modules 5 of the motherboard.

[0030] Optionally, when the multimedia interface 1 is not connected to an external device, regardless of whether the motherboard power socket 2 is powered, the power path management circuit 43 controls the switching circuit 44 to turn off and puts the bidirectional voltage conversion circuit 45 into standby or hibernation state to reduce power consumption.

[0031] In this embodiment, the bidirectional power supply circuit 4 of the multimedia interface includes a first power supply detection circuit 41, a port connection status detection circuit 42, a power path management circuit 43, a switching circuit 44, and a bidirectional voltage conversion circuit 45. The first power supply detection circuit 41 detects the device's own power supply status, and the port connection status detection circuit 42 detects the external device's connection status. Based on the dual detection results, the power path management circuit 43 intelligently controls the switching circuit 44 and the bidirectional voltage conversion circuit 45, enabling both the device to supply power to external devices through the multimedia interface 1 and the device to draw power from external devices through the multimedia interface 1, thus meeting the bidirectional power supply functional requirements of the new multimedia interface 1. Through the coordinated control of the switching circuit 44 and the bidirectional voltage conversion circuit 45, the correct conduction or shutdown of the power path is ensured when switching between the two power supply modes, avoiding the risk of backflow or short circuit and improving system safety. The modular design, with clear division of labor among the functional circuits, is applicable not only to specific multimedia interfaces 1 but also to other multimedia interfaces 1 requiring bidirectional power supply, exhibiting good versatility and expandability.

[0032] In one embodiment, the switching circuit 44 includes at least one MOSFET switch, the source of which is connected to the motherboard power socket 2, the drain of which is connected to the power pin of the multimedia interface 1, and the gate of which is connected to the first output terminal of the power path management circuit 43.

[0033] For example, when the path control signal is high, the MOSFET switch is turned on, and the power of the motherboard power socket 2 is delivered to the power pin of the multimedia interface 1 through the MOSFET switch; when the path control signal is low, the MOSFET switch is turned off, cutting off the path.

[0034] In this embodiment, to improve switching speed and reliability, the switching circuit 44 can be implemented using multiple MOSFET switches connected in parallel or back-to-back in series. For example, when it is necessary to prevent reverse current flow, a back-to-back structure in which the sources or drains of two MOSFET switches are connected can be used.

[0035] In one embodiment, the bidirectional voltage conversion circuit 45 includes a bidirectional buck-boost converter and a controller.

[0036] For example, the first terminal of the bidirectional buck-boost converter is connected to the power pin of the multimedia interface 1, and the second terminal of the bidirectional buck-boost converter is connected to the motherboard power network 3. The bidirectional buck-boost converter can adopt a four-switch Buck-Boost topology, which has boost, buck, and bidirectional transmission capabilities. In this embodiment, the bidirectional buck-boost converter integrates a back-to-back MOSFET switching circuit, which consists of two MOSFETs connected in reverse series to achieve bidirectional conduction and prevent current reverse flow. Specifically, the source of the first MOSFET is connected to the source of the second MOSFET, the drain of the first MOSFET is connected to the power pin of the multimedia interface 1, and the drain of the second MOSFET is connected to the motherboard power network 3.

[0037] For example, the input terminal of the controller is connected to the second output terminal of the power path management circuit 43, and the output terminal of the controller is connected to the control terminal of the bidirectional buck-boost converter, used to control the bidirectional buck-boost converter to operate in a first mode or a second mode according to the mode control signal. In this embodiment, the controller is a dedicated PD chip, i.e., a power transmission protocol controller. This dedicated PD chip generates a corresponding pulse width modulation signal according to the mode control signal to drive each MOSFET switch in the bidirectional buck-boost converter, controlling its turn-on and turn-off timing, thereby realizing bidirectional voltage conversion.

[0038] In this embodiment, in the first mode, the controller controls the bidirectional buck-boost converter to convert the voltage on the motherboard power network 3 side into an output voltage suitable for the multimedia interface 1 side; in the second mode, the controller controls the bidirectional buck-boost converter to convert the input voltage on the multimedia interface 1 side into a voltage suitable for the motherboard power network 3.

[0039] In one embodiment, the controller is a Power Delivery Protocol (PDP) controller. Exemplarily, the PDP controller may be a controller chip that supports the USB PD protocol or the GPMI power delivery protocol. In this embodiment, in addition to receiving mode control signals, the PDP controller can communicate with external devices through the configuration channel of the multimedia interface 1 to obtain the power supply capability information of the external devices, and adjust the output voltage of the bidirectional buck-boost converter according to this information to achieve intelligent power supply.

[0040] In one embodiment, the motherboard power network 3 includes a voltage conversion module. The input terminal of the voltage conversion module is connected to the second terminal of the bidirectional voltage conversion circuit 45, and the output terminal of the voltage conversion module is used to connect to the internal functional module 5 of the motherboard. In this embodiment, the voltage conversion module is used to convert the voltage output by the bidirectional voltage conversion circuit 45 into various operating voltages required by the internal functional module 5 of the motherboard. In practical applications, the voltage conversion module may include multiple sub-modules, each corresponding to a different voltage domain.

[0041] In one embodiment, the voltage conversion module includes a DDR power supply circuit, the output of which is connected to a DDR memory. The input of the DDR power supply circuit is connected to the second terminal of the bidirectional voltage conversion circuit 45, and its output is also connected to the DDR memory. The DDR power supply circuit provides a stable operating voltage to the DDR memory.

[0042] Optionally, the voltage conversion module may also include a core power supply circuit, an I / O power supply circuit, etc., to provide the corresponding operating voltages for the main system-on-chip (SoC), input / output interface circuits, etc.

[0043] In one embodiment, an enable control switch 46 is also included; the enable control switch 46 is connected in series between the motherboard power socket 2 and the motherboard power network 3. The control terminal of the enable control switch 46 is connected to the output terminal of the first power supply detection circuit 41, and is used to receive a first detection signal. When the first detection signal indicates that the motherboard power socket 2 is not powered, the enable control switch 46 is turned off to cut off the power supply path between the motherboard power socket 2 and the motherboard power network 3.

[0044] In this embodiment, when the first detection signal indicates that the motherboard power socket 2 is powered, the enable control switch 46 is turned on, allowing the power of the motherboard power socket 2 to supply power to the motherboard power network 3 through the normal path; when the first detection signal indicates that the motherboard power socket 2 is not powered, the enable control switch 46 is turned off, cutting off the power supply path between the motherboard power socket 2 and the motherboard power network 3, preventing current from flowing back into the motherboard power socket 2 when the multimedia interface 1 supplies power, thereby improving system safety.

[0045] This embodiment provides a bidirectional power supply control method for a multimedia interface 1, such as... Figure 2 As shown, the bidirectional power supply circuit 4 for the multimedia interface described above includes: S201: Detect the power supply status of motherboard power socket 2 and generate the first detection signal.

[0046] Specifically, the first power supply detection circuit 41 detects whether there is an external power input to the motherboard power socket 2. When there is an external power input, a first detection signal indicating that there is power supply is generated; otherwise, a first detection signal indicating that there is no power supply is generated.

[0047] S202: Detect whether multimedia interface 1 is connected to an external device and generate a second detection signal.

[0048] Specifically, the port connection status detection circuit 42 detects whether an external device is plugged into the multimedia interface 1. When an external device is plugged in, a second detection signal is generated to indicate that the external device is connected; otherwise, a second detection signal is generated to indicate that the external device is not connected.

[0049] S203: Generate path control signal and mode control signal based on the first detection signal and the second detection signal.

[0050] Specifically, the power path management circuit 43 receives the first detection signal and the second detection signal, and generates corresponding path control signals and mode control signals according to preset logic rules. The logic is as follows: When the first detection signal indicates that there is power supply and the second detection signal indicates that an external device is connected, a path control signal is generated to turn on the switching circuit 44, and a mode control signal is generated to make the bidirectional voltage conversion circuit 45 work in the first mode. When the first detection signal indicates no power supply and the second detection signal indicates access to an external device, a path control signal is generated to turn off the switching circuit 44, and a mode control signal is generated to make the bidirectional voltage conversion circuit 45 operate in the second mode. When the second detection signal indicates that no external device is connected, regardless of the first detection signal, a path control signal is generated to turn off the switching circuit 44 and put the bidirectional voltage conversion circuit 45 into standby or sleep state.

[0051] S204: When the first detection signal indicates that the motherboard power socket 2 is powered and the second detection signal indicates that the multimedia interface 1 is connected to an external device, the switching circuit 44 connected in series between the power pins of the motherboard power socket 2 and the multimedia interface 1 is turned on according to the path control signal, and the bidirectional voltage conversion circuit 45 is controlled to work in the first mode according to the mode control signal, so that the motherboard power socket 2 outputs power to the power pins of the multimedia interface 1.

[0052] S205: When the first detection signal indicates that the motherboard power socket 2 is not powered and the second detection signal indicates that the multimedia interface 1 is connected to an external device, the switch circuit 44 is turned off according to the path control signal, and the bidirectional voltage conversion circuit 45 is controlled to work in the second mode according to the mode control signal, so that the power pin of the multimedia interface 1 supplies power to the motherboard power network 3 through the bidirectional voltage conversion circuit 45.

[0053] In this embodiment, through steps S201-S205, the first power supply detection circuit 41 detects the device's own power supply status, and the port connection status detection circuit 42 detects the external device's access status. Based on the dual detection results, the power path management circuit 43 intelligently controls the switching circuit 44 and the bidirectional voltage conversion circuit 45. This enables both the device to supply power to external devices via the multimedia interface 1 and to draw power from external devices via the multimedia interface 1, meeting the bidirectional power supply requirements of the new multimedia interface 1. Through the coordinated control of the switching circuit 44 and the bidirectional voltage conversion circuit 45, the correct conduction or shutdown of the power path is ensured when switching between the two power supply modes, avoiding the risk of backflow or short circuits and improving system safety. The modular design, with clear division of labor among the functional circuits, is applicable not only to specific multimedia interfaces 1 but also to other multimedia interfaces 1 requiring bidirectional power supply, exhibiting good versatility and expandability.

[0054] This embodiment provides an electronic device, including a multimedia interface 1, a motherboard power socket 2, a motherboard power network 3, and the aforementioned bidirectional power supply circuit 4 for the multimedia interface.

[0055] The bidirectional power supply circuit 4 for the multimedia interface is connected to the multimedia interface 1, the motherboard power socket 2, and the motherboard power network 3. Specifically, the second terminal of the bidirectional voltage conversion circuit 45 is connected to the motherboard power network 3, and the motherboard power network 3 is connected to the internal functional module 5 of the motherboard.

[0056] The motherboard's internal functional module 5 includes DDR memory, the main control SoC, and input / output interface circuits. The motherboard power network 3 provides the necessary operating voltage to these functional modules through a voltage conversion module.

[0057] The electronic device can be a television, set-top box, monitor, game console, mobile phone, tablet computer, laptop computer, or other electronic device with a multimedia interface 1. When the electronic device is connected to other external devices through the multimedia interface 1, it can automatically switch the power supply direction according to its own power supply status and the external device connection status, thus realizing bidirectional power supply function.

[0058] In one embodiment, the internal functional module 5 of the motherboard includes at least one of a DDR memory, a main control SoC, and an input / output interface circuit. The DDR memory is used for data storage, the main control SoC is used for system control and data processing, and the input / output interface circuit is used to connect external input / output devices. These functional modules have different power requirements, and the corresponding voltages are provided by various voltage conversion modules in the motherboard power network 3.

[0059] The bidirectional power supply circuit 4, control method, and electronic equipment for multimedia interfaces provided by this invention can be widely used in various electronic devices with multimedia interfaces 1, especially multimedia interfaces 1 that support bidirectional power supply, such as smart TVs, set-top boxes, monitors, game consoles, mobile phones, and tablet computers. This invention enables bidirectional power supply between devices, simplifies user operation, improves user experience, and has good industrial applicability and market prospects.

[0060] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions 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 invention, and should all be included within the protection scope of the present invention.

Claims

1. A multimedia interface bidirectional power supply circuit, characterized in that, It includes a first power supply detection circuit, a port connection status detection circuit, a power path management circuit, a switching circuit, and a bidirectional voltage conversion circuit; The input terminal of the first power supply detection circuit is used to connect to the motherboard power socket, and is used to detect the power supply status of the motherboard power socket and generate a first detection signal; The input terminal of the port connection status detection circuit is used to connect to the multimedia interface, and is used to detect whether the multimedia interface is connected to an external device and generate a second detection signal; The first input terminal of the power path management circuit is connected to the motherboard power socket, and the second input terminal of the power path management circuit is connected to the output terminal of the first power supply detection circuit and the output terminal of the port connection status detection circuit, respectively, for generating path control signals and mode control signals based on the first detection signal and the second detection signal; The switching circuit is connected in series between the motherboard power socket and the power pin of the multimedia interface. The control terminal of the switching circuit is connected to the first output terminal of the power path management circuit, and is used to turn on or off according to the path control signal. The first terminal of the bidirectional voltage conversion circuit is connected to the power pin of the multimedia interface, the second terminal of the bidirectional voltage conversion circuit is connected to the motherboard power network, and the control terminal of the bidirectional voltage conversion circuit is connected to the second output terminal of the power path management circuit, which is used to operate in the first mode or the second mode according to the mode control signal. When the first detection signal indicates that the motherboard power socket is powered and the second detection signal indicates that the multimedia interface is connected to an external device, the power path management circuit controls the switching circuit to be turned on and controls the bidirectional voltage conversion circuit to work in the first mode, so that the motherboard power socket outputs power to the power pin of the multimedia interface through the switching circuit. When the first detection signal indicates that the motherboard power socket is not powered and the second detection signal indicates that the multimedia interface is connected to an external device, the power path management circuit controls the switching circuit to turn off and controls the bidirectional voltage conversion circuit to work in the second mode, so that the power pin of the multimedia interface supplies power to the motherboard power network through the bidirectional voltage conversion circuit.

2. The multi-media interface bidirectional power supply circuit of claim 1, wherein, The switching circuit includes at least one MOSFET switch, the source of which is connected to the motherboard power socket, the drain of which is connected to the power pin of the multimedia interface, and the gate of which is connected to the first output terminal of the power path management circuit.

3. The multi-media interface bidirectional power supply circuit of claim 1, wherein, The bidirectional voltage conversion circuit includes a bidirectional buck-boost converter and a controller; The first end of the bidirectional buck-boost converter is connected to the power pin of the multimedia interface, and the second end of the bidirectional buck-boost converter is connected to the motherboard power network. The input terminal of the controller is connected to the second output terminal of the power path management circuit, and the output terminal of the controller is connected to the control terminal of the bidirectional buck-boost converter, for controlling the bidirectional buck-boost converter to operate in the first mode or the second mode according to the mode control signal.

4. The multi-media interface bidirectional power supply circuit of claim 3, wherein, The controller is a power transmission protocol controller.

5. The multi-media interface bi-directional power supply circuit of claim 1, wherein, The motherboard power network includes a voltage conversion module. The input terminal of the voltage conversion module is connected to the second terminal of the bidirectional voltage conversion circuit, and the output terminal of the voltage conversion module is used to connect to the internal functional modules of the motherboard.

6. The multi-media interface bidirectional power supply circuit of claim 5, wherein, The voltage conversion module includes a DDR power supply circuit, the output of which is used to connect to the DDR memory.

7. The multi-media interface bidirectional power supply circuit of claim 1, wherein, It also includes an enable control switch; The enable control switch is connected in series between the motherboard power socket and the motherboard power network; The control terminal of the enable control switch is connected to the output terminal of the first power supply detection circuit. When the first detection signal indicates that the motherboard power socket is not powered, the enable control switch is turned off to cut off the power supply path between the motherboard power socket and the motherboard power network.

8. A method for controlling the bi-directional power supply of a multimedia interface, applied in the bi-directional power supply circuit of any one of claims 1 to 7, characterized in that, include: The power supply status of the motherboard power connector is detected, and a first detection signal is generated; Detect whether the multimedia interface is connected to an external device and generate a second detection signal; Based on the first detection signal and the second detection signal, a path control signal and a mode control signal are generated; When the first detection signal indicates that the motherboard power socket is powered and the second detection signal indicates that the multimedia interface is connected to an external device, the switching circuit connected in series between the motherboard power socket and the power pin of the multimedia interface is turned on according to the path control signal, and the bidirectional voltage conversion circuit is controlled to work in the first mode according to the mode control signal, so that the motherboard power socket outputs power to the power pin of the multimedia interface. When the first detection signal indicates that the motherboard power socket is not powered and the second detection signal indicates that the multimedia interface is connected to an external device, the switching circuit is turned off according to the path control signal, and the bidirectional voltage conversion circuit is controlled to work in the second mode according to the mode control signal, so that the power pin of the multimedia interface supplies power to the motherboard power network through the bidirectional voltage conversion circuit.

9. An electronic device, comprising: Includes a multimedia interface, a motherboard power socket, a motherboard power network, and a bidirectional power supply circuit for the multimedia interface as described in any one of claims 1 to 7; The second terminal of the bidirectional voltage conversion circuit is connected to the motherboard power network, and the motherboard power network is connected to the internal functional modules of the motherboard.

10. The electronic device of claim 9, wherein, The internal functional modules of the motherboard include at least one of DDR memory, main control SoC, and input / output interface circuits.

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