Intelligent terminal single USB interface multi-functional multiplex system

Abstract

The application discloses a multi-functional multiplexing system realized by a single USB interface of an intelligent terminal, comprising an AP module, a HUB module, a charging conversion circuit and a TYPE-C interface; the AP module is connected with the TYPE-C interface through a first switch and a second switch, the HUB module is connected with the first switch, the second switch and a first external device, and the charging conversion circuit is connected with the AP module, the TYPE-C interface and the first external device; when the AP module is in an OTG mode and recognizes an external charging source connected with the TYPE-C interface, the first switch and the second switch are disconnected, so that the AP module is connected with the TYPE-C interface and the first external device through the HUB module, the AP module is disconnected from an output power supply circuit, the TYPE-C interface is connected with the charging conversion circuit, power supply is provided for the AP module and the first external device, the single USB port can be connected with the external device and the charging source, and the OTG expansion function can continue to work while the charging mode is realized.

Description

Technical Field

[0001] This invention relates to the field of electronic device technology, and in particular to a multi-functional multiplexing system for a single USB interface in a smart terminal. Background Technology

[0002] Currently, most smart terminals have only one USB port, which is generally used to connect other devices or for charging. Typically, a smart terminal cannot charge when other devices are connected, and cannot connect other devices when charging. However, in real-world usage scenarios, there is a need to implement multiple USB functions. Existing technologies generally solve this by adding an external HUB expansion dock, or by adding a HUB chip inside the smart terminal to achieve extended functionality.

[0003] However, current solutions that add an external hub are not ideal for product integration. Furthermore, when a hub is connected, the expanded ports can only be used for host functionality, not device functionality. Another integrated solution, which incorporates the hub into the smart terminal, requires the smart terminal to be in OTG mode when the hub's expansion function is active. In this mode, the USB ports are only providing external power and cannot be used for charging. Summary of the Invention

[0004] The main objective of this invention is to provide a multi-functional multiplexing system for a single USB interface in a smart terminal, aiming to solve the technical problem that a single USB interface of a smart terminal cannot achieve charging in OTG mode in the prior art.

[0005] Based on the above objectives, this invention proposes a multi-functional multiplexing system for a smart terminal with a single USB interface, which is applied to a smart terminal and includes an AP module, a HUB module, a charging conversion circuit and a TYPE-C interface.

[0006] The AP module is connected to the TYPE-C interface in sequence through the first switch and the second switch. The HUB module is connected to the first switch and the second switch respectively, and is connected to the first external device. The charging conversion circuit is connected to the AP module and the TYPE-C interface respectively, and is connected to the HUB module through the first external device.

[0007] When the AP module is in OTG mode and recognizes an external charging source connected to the TYPE-C interface, the first switch and the second switch are disconnected, so that the AP module can connect to the TYPE-C interface and the first external device through the HUB module respectively. The AP module disconnects the output power supply line, so that the input power supply line from the TYPE-C interface to the charging conversion circuit is connected and power is supplied to the AP module and the first external device.

[0008] Furthermore, the charging conversion circuit automatically identifies whether the TYPE-C interface is connected to an external charging source. If so, it notifies the AP module to disconnect the output power supply line via the CC protocol.

[0009] Furthermore, when the AP module is in OTG mode, the first switch and the second switch are disconnected, so that the AP module can be connected to the TYPE-C interface and the first external device through the HUB module respectively. The TYPE-C interface is connected to the second external device. The output power supply line of the AP module is turned on and supplies power to the charging conversion circuit, so that the charging conversion circuit supplies power to the first external device and the second external device.

[0010] Furthermore, when the AP module is in device mode and the smart terminal is powered off, the first switch and the second switch are connected, so that the AP module can be directly connected to the TYPE-C interface through the first switch and the second switch. The TYPE-C interface is connected to a computer device to download and upgrade the smart terminal.

[0011] Furthermore, when the AP module is in device mode and the smart terminal is powered on, the first switch and the second switch are connected, so that the AP module can be directly connected to the TYPE-C interface through the first switch and the second switch. The TYPE-C interface is connected to a computer device, so that the computer device can perform corresponding operations on the smart terminal.

[0012] Furthermore, the charging conversion circuit includes a PD chip, a MOSFET control circuit, and a buck circuit unit. The PD chip is connected to the AP module, the MOSFET control circuit, and the TYPE-C interface, respectively. The buck circuit unit is connected to the MOSFET control circuit and the first external device, respectively.

[0013] Furthermore, when the AP module is in OTG mode, and the PD chip recognizes the external charging source connected to the TYPE-C interface, the AP module disconnects the output power supply line, and the input power supply line from the TYPE-C interface to the MOS transistor control circuit is turned on, and the buck circuit unit is turned on to supply power to the first external device.

[0014] Furthermore, when the AP module is in OTG mode, and the PD chip recognizes that a second external device is connected to the TYPE-C interface, the input power supply path from the AP module to the PD chip and the MOS transistor control circuit is turned on, and the input power supply path from the MOS transistor control circuit to the TYPE-C interface is turned on to supply power to the second external device, and the input power supply path of the buck circuit unit is turned on to supply power to the first external device.

[0015] Furthermore, the charging conversion circuit also includes a transistor control circuit, which is connected to the PD chip, the MOS transistor control circuit, and the buck circuit unit, respectively.

[0016] Furthermore, the AP module includes an AP processor unit, a battery charger chip, and a battery. The AP processor unit is connected to the battery charger chip, and the battery charger chip is connected to the battery, and the battery supplies power to the AP processor unit.

[0017] The present invention provides a multi-functional multiplexing system for a single USB port in smart terminals. In OTG mode, a single USB port can connect to external devices and automatically identify and switch to charging mode while the OTG expansion function continues to work. The single USB port can automatically switch modes according to the type of external device and adapter, solving the pain point that it cannot automatically switch to charging mode in OTG mode. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of an embodiment of the intelligent terminal single USB interface multi-functional multiplexing system of the present invention;

[0019] Figure 2 This is a schematic diagram of another embodiment of the intelligent terminal single USB interface multi-functional multiplexing system of the present invention;

[0020] Figure 3 This is a schematic diagram of another embodiment of the intelligent terminal single USB interface multi-functional multiplexing system of the present invention;

[0021] Figure 4 This is a schematic diagram of an embodiment of the AP module and charging conversion circuit of the present invention.

[0022] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0023] 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 a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0024] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0025] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0026] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0027] Reference Figure 1-4 The present invention provides a multi-functional multiplexing system for a single USB interface in a smart terminal, which is applied to a smart terminal. Specifically, it includes an AP module, a HUB module, a charging conversion circuit, and a TYPE-C interface. The AP module is the main processor module of the smart terminal, and may include a control chip and a battery. The HUB module is a multi-port repeater, which is a tool for expanding the USB interface. The charging conversion circuit is mainly used to convert the charging route and may include a PD chip (PDIC). It should be noted that the AP module can be in OTG mode or device mode. When in OTG mode, the smart terminal is equivalent to a master device and can control external devices, such as headphones and cameras. When in device mode, the smart terminal is equivalent to a slave device and can only be controlled by external devices.

[0028] In this embodiment, the AP module is connected to the TYPE-C interface in sequence through the first switch and the second switch. The HUB module is connected to the first switch and the second switch respectively, and is connected to the first external device. The charging conversion circuit is connected to the AP module and the TYPE-C interface respectively, and is connected to the HUB module through the first external device. The first external device can be a camera, mouse, USB flash drive, earphones, etc.

[0029] When the AP module is in OTG mode and recognizes an external charging source connected to the TYPE-C interface, the first switch and the second switch are disconnected, so that the AP module can connect to the TYPE-C interface and the first external device through the HUB module respectively. The AP module disconnects the output power supply line, so that the input power supply line from the TYPE-C interface to the charging conversion circuit is connected, and power is supplied to the AP module and the first external device.

[0030] For example, refer to Figure 1 When the smart terminal is powered on, the first external device mentioned above is the thermal imaging camera of the smart terminal. When the thermal imaging function of the APP is opened, the AP module is in OTG mode. Logically, the levels of switches switch1 and switch2 will be pulled high at the same time, causing the switch1 and switch2 to disconnect. At this time, the wire channel DP0 / DM0--DP2 / DM2 between switch1 and the HUB module, and the wire channel H_DP0 / H_DM0--DP3 / DM3 between switch2 and the HUB module will be connected at the same time. That is, the AP module is connected to the TYPE-C interface through the HUB module, and is connected to the thermal imaging camera through the HUB module. The HUB module will work. At this time, DP2 / DM2 is equivalent to being expanded into two USB interfaces. One allows the thermal imaging camera to work normally, and the other TYPE-C interface can be connected to an external power source for charging. The power supply line (VBUS) input to the charging conversion circuit of the TYPE-C interface is connected, thereby enabling the charging conversion circuit to supply power to the AP module and the thermal imaging camera respectively through VBUS.

[0031] The present invention provides a multi-functional multiplexing system for a single USB port in smart terminals. In OTG mode, a single USB port can connect to external devices and automatically identify and switch to charging mode while the OTG expansion function continues to work. The single USB port can automatically switch modes according to the type of external device and adapter, solving the pain point that it cannot automatically switch to charging mode in OTG mode.

[0032] In one embodiment, refer to Figure 1The charging conversion circuit automatically identifies whether an external charging source is connected to the TYPE-C interface. If so, it notifies the AP module to disconnect the output power supply via the CC protocol. Specifically, the charging source can include a power supply and a power adapter. When an adapter is inserted into the TYPE-C interface, the charging conversion circuit will automatically determine whether it is an adapter. If it is identified as an adapter, it will notify the AP module to turn off the output VBUS via the relevant CC protocol. At this time, the VBUS power will be input to the AP module through the adapter and then used to charge the battery of the smart terminal itself. At this time, the power supply for the thermal imaging camera is also changed from the AP module input to the adapter.

[0033] In one embodiment, when the AP module is in OTG mode and does not require charging, the first switch and the second switch are disconnected, so that the AP module can be connected to the TYPE-C interface and the first external device through the HUB module respectively, and the TYPE-C interface is connected to the second external device. The output power supply line of the AP module is turned on and supplies power to the charging conversion circuit, so that the charging conversion circuit supplies power to the first external device and the second external device. The second external device can be headphones, mouse, keyboard, etc.

[0034] For example, refer to Figure 2 When the smart terminal is powered on, the first external device is the smart terminal's thermal imaging camera. When the thermal imaging function of the APP is activated, the AP module is in OTG mode. Logically, the voltage levels of switches switch1 and switch2 will be pulled high simultaneously, causing a disconnect between switches switch1 and switch2. At this time, the wire channels DP0 / DM0--DP2 / DM2 between switch1 and the HUB module, and H_DP0 / H_DM0--DP3 / DM3 between switch2 and the HUB module will be simultaneously connected. That is, the AP module is connected to the TYPE-C interface through the HUB module, and is connected to the thermal imaging camera through the HUB module. The HUB module will then be operational. At this time, DP2 / DM2 is equivalent to being expanded into two USB interfaces. One allows the thermal imaging camera to work normally, and the other TYPE- interface can be connected to external devices such as headphones, mice, and keyboards. The charging conversion circuit will automatically identify the protocol. At this time, the AP module supplies power to the charging conversion circuit through VBUS, enabling the charging conversion circuit to provide VBUS power to the thermal imaging camera and external devices.

[0035] In one embodiment, when the AP module is in device mode and the smart terminal is powered off, the first switch and the second switch are connected so that the AP module can be directly connected to the TYPE-C interface through the first switch and the second switch. The TYPE-C interface is then connected to a computer device to download and upgrade the smart terminal.

[0036] For example, refer to Figure 3 When the AP module is in device mode and the smart terminal is powered off, if the smart terminal needs to download and upgrade, switches 1 and 2 are in the default low-level state. At this time, DP0 / DM0--DP1 / DM1--DP3 / DM3 are connected, the HUB module is not working, the thermal imaging camera is not turned on, and the TYPE-C interface is connected to a computer device. At this time, the smart terminal can download and upgrade.

[0037] In one embodiment, when the AP module is in device mode and the smart terminal is powered on, the first switch and the second switch are connected so that the AP module can be directly connected to the TYPE-C interface through the first switch and the second switch. The TYPE-C interface is connected to the computer device so that the computer device can perform corresponding operations on the smart terminal.

[0038] For example, when the AP module is in device mode and the smart terminal is powered on, and the TYPE-C interface is plugged into the computer device, the charging conversion circuit will automatically recognize that it is currently in device mode. At this time, DP0 / DM0--DP1 / DM1--DP3 / DM3 are turned on, the HUB module is not working, the thermal imaging camera is not turned on, and VBUS is connected to the AP module through the TYPE-C interface. At this time, the computer device can perform relevant operations on the smart terminal.

[0039] The present invention provides a multi-functional multiplexing system for a single USB port in a smart terminal, which integrates the HUB expansion function into the smart terminal body. At the same time, a single USB port can be used as both a host and a device. In addition, in OTG mode, it can also be used for charging. This ensures an integrated design while also enabling automatic switching between host and device functions.

[0040] In one embodiment, the charging conversion circuit includes a PD chip, a MOSFET control circuit, and a buck circuit unit. The PD chip is connected to the AP module, the MOSFET control circuit, and the TYPE-C interface, respectively. The buck circuit unit is connected to the MOSFET control circuit and a first external device, respectively. The PD chip is a USB PD protocol fast charging chip (PDID), and the buck circuit unit is a step-down converter circuit. The buck circuit unit can be adapted to various power adapters, greatly expanding the range of charging sources. The MOSFET control circuit is a circuit that uses MOSFETs as switches for control. The PD chip, buck circuit unit, and MOSFET control circuit can all adopt existing technologies. Since the core of this invention is not in this regard, the specific structure will not be described in detail.

[0041] When the AP is in OTG mode, the PD chip recognizes the external charging source connected to the TYPE-C interface. The AP module disconnects the output power supply line, and the input power supply line from the TYPE-C interface to the MOS transistor control circuit is turned on, and the buck circuit unit is turned on to supply power to the first external device.

[0042] When the AP module is in OTG mode, and the PD chip recognizes the second external device connected to the TYPE-C interface, the input power supply path from the AP module to the PD chip and the MOS transistor control circuit is turned on, and the input power supply path from the MOS transistor control circuit to the TYPE-C interface is turned on to supply power to the second external device. The input power supply path of the buck circuit unit is also turned on to supply power to the first external device.

[0043] In one embodiment, the charging conversion circuit further includes a transistor control circuit, which is connected to the PD chip, the MOSFET control circuit, and the buck circuit unit, respectively, and further enhances the driving of the MOSFET control circuit through the transistor control circuit.

[0044] In one embodiment, the AP module includes an AP processor unit, a battery charger chip, and a battery. The AP processor unit is connected to the battery charger chip, and the battery charger chip is connected to the battery and supplies power to the AP processor unit through the battery. The battery charger chip can supply power through VBUS1 or charge through VBUS1.

[0045] For example, refer to Figure 4 When the AP module is in OTG mode, and the PD chip recognizes the external charging source connected to the TYPE-C interface, the AP module disconnects the output power supply line. That is, the output VBUS1 of the battery charger chip is disconnected, and the input power supply line VBUS from the TYPE-C interface to the MOSFET control circuit is turned on. The MOSFET control circuit is connected to the DET signal pin of the PD chip, and the transistor control circuit is connected to the EN signal pin of the PD chip. The MOSFET control circuit is turned on to the input VBUS1 of the battery charger chip through the transistor control circuit, thereby supplying power to the AP module. It is also turned on to the VBUS2 of the buck circuit unit through the transistor control circuit. The VDD signal pin of the buck circuit unit is connected to the first external device, thereby supplying power to the first external device.

[0046] When the AP module is in OTG mode, and the PD chip recognizes the second external device connected to the TYPE-C interface, the AP module turns on the output power supply path. That is, the output VBUS1 of the battery charger chip is turned on. The battery charger chip turns on the input VBUS1 of the MOSFET control circuit through the transistor control circuit. The MOSFET control circuit and the VBUS of the TYPE-C interface are turned on, thus supplying power to the second external device. At this time, the MOSFET control circuit turns on the VBUS2 of the buck circuit unit through the transistor control circuit, thus supplying power to the first external device.

[0047] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A multi-functional multiplexing system using a single USB interface in a smart terminal, applied to a smart terminal, characterized in that, Includes AP module, HUB module, charging conversion circuit and TYPE-C interface; The AP module is connected to the TYPE-C interface in sequence through the first switch and the second switch. The HUB module is connected to the first switch and the second switch respectively, and is connected to the first external device. The charging conversion circuit is connected to the AP module and the TYPE-C interface respectively, and is connected to the HUB module through the first external device. When the AP module is in OTG mode and recognizes an external charging source connected to the TYPE-C interface, the first switch and the second switch are disconnected, so that the AP module can connect to the TYPE-C interface and the first external device through the HUB module respectively. The AP module disconnects the output power supply line, so that the input power supply line from the TYPE-C interface to the charging conversion circuit is connected and power is supplied to the AP module and the first external device.

2. The intelligent terminal single USB interface multi-functional multiplexing system as described in claim 1, characterized in that, The charging conversion circuit automatically identifies whether the TYPE-C interface is connected to an external charging source. If so, it notifies the AP module to disconnect the output power supply line via the CC protocol.

3. The intelligent terminal single USB interface multi-functional multiplexing system as described in claim 1, characterized in that, When the AP module is in OTG mode, the first switch and the second switch are disconnected, so that the AP module can be connected to the TYPE-C interface and the first external device through the HUB module respectively. The TYPE-C interface is connected to the second external device. The output power supply line of the AP module is turned on and supplies power to the charging conversion circuit, so that the charging conversion circuit supplies power to the first external device and the second external device.

4. The intelligent terminal single USB interface multi-functional multiplexing system as described in claim 1, characterized in that, When the AP module is in device mode and the smart terminal is powered off, the first switch and the second switch are connected, so that the AP module can be directly connected to the TYPE-C interface through the first switch and the second switch. The TYPE-C interface is connected to a computer device to download and upgrade the smart terminal.

5. The intelligent terminal single USB interface multi-functional multiplexing system as described in claim 1, characterized in that, When the AP module is in device mode and the smart terminal is powered on, the first switch and the second switch are connected, so that the AP module can be directly connected to the TYPE-C interface through the first switch and the second switch. The TYPE-C interface is connected to a computer device, so that the computer device can perform corresponding operations on the smart terminal.

6. The intelligent terminal single USB interface multi-functional multiplexing system as described in claim 1, characterized in that, The charging conversion circuit includes a PD chip, a MOS transistor control circuit, and a buck circuit unit. The PD chip is connected to the AP module, the MOS transistor control circuit, and the TYPE-C interface, respectively. The buck circuit unit is connected to the MOS transistor control circuit and the first external device, respectively.

7. The intelligent terminal single USB interface multi-functional multiplexing system as described in claim 6, characterized in that, When the AP module is in OTG mode, and the PD chip recognizes the external charging source connected to the TYPE-C interface, the AP module disconnects the output power supply line, and the input power supply line from the TYPE-C interface to the MOS transistor control circuit is turned on, and the buck circuit unit is turned on to supply power to the first external device.

8. The intelligent terminal single USB interface multi-functional multiplexing system as described in claim 6, characterized in that, When the AP module is in OTG mode, and the PD chip recognizes that a second external device is connected to the TYPE-C interface, the input power supply path from the AP module to the PD chip and the MOS transistor control circuit is turned on, and the input power supply path from the MOS transistor control circuit to the TYPE-C interface is turned on to supply power to the second external device. The input power supply path of the buck circuit unit is also turned on to supply power to the first external device.

9. The intelligent terminal single USB interface multi-functional multiplexing system as described in claim 6, characterized in that, The charging conversion circuit also includes a transistor control circuit, which is connected to the PD chip, the MOS transistor control circuit, and the buck circuit unit.

10. The intelligent terminal single USB interface multi-functional multiplexing system as described in claim 6, characterized in that, The AP module includes an AP processor unit, a battery charger chip, and a battery. The AP processor unit is connected to the battery charger chip, and the battery charger chip is connected to the battery, which powers the AP processor unit.

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