A power switching device for power supply control and HDMI conversion and its control method

Abstract

The present invention discloses a power switching device for power supply control and HDMI conversion and its control method. The device includes a power switching switch circuit module, a switch driving circuit module and a soft start circuit module respectively connected to the power switching switch circuit module. Among them, the power switching switch circuit module is used to switch the power supply for the external power supply of the slave device and prevent power backflow; the switch driving circuit module is used to control the power switch of the slave device by using a signal; the soft start circuit module is used to optimize the peak current of the system so that the peak current of the system soft start meets the requirements. The present invention can realize the switching of the power supply master and slave devices without changing the roles of the master and slave devices, thereby realizing the power supply to the TYPE C to HDMI module, and combining the TYPE C interface and the HDMI interface into one without increasing the cost and additional power supply, realizing the compatibility with most PCs, so that most PCs can be connected to an external extended screen with a TYPE C interface.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply control and conversion, and more particularly to a power switching device for power supply control and HDMI conversion and a control method thereof. Background Art

[0002] When an existing PC host is connected to an external extended screen with a TYPE C interface, it is generally connected in two ways. One is to connect the TYPE C interface of the PC host to the TYPE C interface of the extended screen; the other is to use an HDMI to TYPE C converter to connect the HDMI interface of the PC host to the TYPE C interface of the extended screen.

[0003] However, in the process of researching and practicing the existing technology, the inventors of the present invention found that the existing connection methods between a PC host and an external extended screen lack a two-in-one solution. Since some PCs only have an HDMI port and no TYPE C port, without a two-in-one method, it will cause inconvenience in use. Moreover, if the HDMI to TYPE C method is used, additional power supply needs to be added to this module, resulting in additional inconvenience in use, and using a PD protocol chip in the design will lead to an increase in cost. Therefore, there is an urgent need for a power switching device that can solve the above technical defects and can be used for both power supply control and HDMI conversion. Summary of the Invention

[0004] The technical problem to be solved by the embodiments of the present invention is to provide a power switching device for power supply control and HDMI conversion and a control method thereof, which can switch and control the power supply of the master and slave machines without changing the roles of the master and slave machines, so as to supply power to the TYPE C to HDMI module and realize the integration of the TYPE C port and the HDMI port.

[0005] To solve the above problems, a first aspect of the embodiments of the present application provides a power switching device for power supply control and HDMI conversion, including a power switching circuit module, and a switch driving circuit module and a soft start circuit module respectively connected to the power switching circuit module; wherein,

[0006] The power switching circuit module is used to switch the power supply for the external power supply of the slave machine and prevent power backflow;

[0007] The switch driving circuit module is used to control the power switch of the slave machine by using a signal;

[0008] The soft start circuit module is used to optimize the system starting peak current so that the system starting peak current meets the preset requirements.

[0009] In a possible implementation of the first aspect, the first end of the power switching device is connected to the power supply for external power supply of the slave device, and the second end of the power switching device is connected to the TYPE C interface of the slave device;

[0010] Specifically, the first end of the power switching switch circuit module in the power switching device is connected to the power supply for external power supply of the slave device, and the second end of the power switching switch circuit module in the power switching device is connected to the TYPE C interface of the slave device.

[0011] In a possible implementation of the first aspect, the power switching device for power supply control and HDMI conversion further includes:

[0012] A main chip module, configured to detect whether the slave device is connected to the TYPE C to HDMI module through the CC pin on the TYPE C line, and control the operation of the power switching device according to the detected connection result.

[0013] In a possible implementation of the first aspect, the third end of the power switching device is connected to the main chip module; specifically, the first end of the switch driving circuit module in the power switching device is connected to the main chip module, and the second end of the switch driving circuit module in the power switching device is connected to the third end of the power switching switch circuit module.

[0014] In a possible implementation of the first aspect, the soft start circuit module is connected to the fourth end of the power switching switch circuit module.

[0015] In a possible implementation of the first aspect, the power switching device for power supply control and HDMI conversion further includes:

[0016] A TYPE C to HDMI module, configured to connect the slave device to the host through a TYPE C female head to HDMI optional module installed on the TYPE C line.

[0017] A second aspect of the embodiments of the present application provides a control method for a power switching device for power supply control and HDMI conversion, including the following steps:

[0018] Detect whether the CC pin on the TYPE C line of the TYPE C interface of the slave device is connected to the TYPE C to HDMI module through the main chip module;

[0019] If so, after the main chip module controls the level signal of the switch drive circuit module accessing the power switching device to be a high-level signal, the power switching switch circuit module is used to control the slave power supply to supply power to the TYPE C to HDMI module, so that the slave supplies power to the HDMI interface of the host through the TYPE C to HDMI module;

[0020] If not, the main chip module controls the level signal of the switch drive circuit module accessing the power switching device to be a low-level signal, and the power switching switch circuit module disconnects the slave power supply from supplying power to the TYPE C to HDMI module, so that the slave is connected to the TYPE C interface of the host through a TYPE C cable.

[0021] Implementing the embodiments of the present invention has the following beneficial effects:

[0022] A power switching device for power supply control and HDMI conversion and its control method provided by the embodiments of the present invention, the device includes a power switching switch circuit module, and a switch drive circuit module and a soft start circuit module respectively connected to the power switching switch circuit module; wherein, the power switching switch circuit module is used to switch the power supply for the external power supply of the slave and prevent power backflow; the switch drive circuit module is used to control the power switch of the slave through a signal; the soft start circuit module is used to optimize the system start-up peak current so that the system start-up peak current meets the requirements.

[0023] Compared with the prior art, the present invention can realize the switching of the power supply master and slave without changing the roles of the master and slave, so as to realize the power supply to the TYPE C to HDMI module, and combine the TYPE C interface and the HDMI interface into one without increasing costs and additional power supplies, realizing compatibility with most PCs, so that most PCs can be connected to the extended screen of the slave with an external TYPE C interface. Description of the Drawings

[0024] Figure 1 It is a schematic structural diagram of a power switching device for power supply control and HDMI conversion provided by the first embodiment of the present invention;

[0025] Figure 2 It is a schematic circuit diagram of a power switching device for power supply control and HDMI conversion provided by the first embodiment of the present invention;

[0026] Figure 3 It is a schematic structural diagram of another power switching device for power supply control and HDMI conversion provided by the first embodiment of the present invention;

[0027] Figure 4Schematic flowchart of a control method for a power switching device for power supply control and HDMI conversion provided by the second embodiment of the present invention;

[0028] Figure 5 Schematic structural diagram of the master-slave connection system provided by the second embodiment of the present invention;

[0029] Figure 6 Schematic flowchart of an implementation manner of a control method for a power switching device for power supply control and HDMI conversion provided by the second embodiment of the present invention. Detailed implementation manners

[0030] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0031] In the description of the present application, it should be understood that the terms "first", "second", etc. are only used for descriptive purposes, and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise specified, the meaning of "plurality" is two or more.

[0032] First, the application scenarios that the present invention can provide are introduced. For example, a power switching device for power supply control and HDMI conversion and its control method are provided, which can control the switching of the power master-slave role without changing the master-slave role, thereby powering the TYPE C to HDMI module and realizing the integration of the TYPE C interface and the HDMI interface.

[0033] The first embodiment of the present invention:

[0034] Please refer to Figure 1-3 。

[0035] As Figure 1 shown, this embodiment provides a power switching device for power supply control and HDMI conversion, including a power switching switch circuit module, and a switch driving circuit module and a soft start circuit module respectively connected to the power switching switch circuit module; wherein,

[0036] The power switching switch circuit module is used to switch the power supply for the external power supply of the slave device and prevent power backflow;

[0037] The switch driving circuit module is used to control the power switch of the slave device by using a signal;

[0038] The soft start circuit module is used to optimize the inrush current of the system so that the inrush current of the system soft start meets the preset requirements.

[0039] Specifically, the power switch module can prevent power backflow at the same time, the switch driving circuit can ensure that a small signal is used to control the power switch, and the soft start module is used to optimize the inrush current of the system.

[0040] In a preferred embodiment, the first end of the power switching device is connected to the power supply for external power supply of the slave device, and the second end of the power switching device is connected to the TYPE C interface of the slave device;

[0041] Specifically, the first end of the power switch circuit module in the power switching device is connected to the power supply for external power supply of the slave device, and the second end of the power switch circuit module in the power switching device is connected to the TYPE C interface of the slave device.

[0042] In a specific embodiment, a power switching device provided in this embodiment for power supply control and HDMI conversion includes a power switch module, a switch driving circuit and a soft start module. The power switching device includes a first MOS transistor Q1, a second MOS transistor Q2, a third MOS transistor Q1, a first resistor R1, a second resistor R2 and a first capacitor C1. Among them, the output VOUT of the second MOS transistor supplies power to the TYPE C to HDMI module.

[0043] Specifically, as Figure 2 shown, the drain of the first MOS transistor Q1 is connected to the system power supply, the source of the first MOS transistor Q1 is respectively connected to the first end of the first resistor R1, the first end of the first capacitor C1 and the source of the second MOS transistor Q2, and the gate of the first MOS transistor Q1 is respectively connected to the second end of the first resistor R1, the second end of the first capacitor C1, the gate of the second MOS transistor Q2 and the first end of the second resistor R2. The drain of the second MOS transistor Q2 is connected to the output voltage terminal for supplying power to the TYPE C to HDMI module; the second end of the first resistor R1 is also respectively connected to the first end of the second resistor R2, the second end of the first capacitor C1 and the gate of the second MOS transistor Q2; the second end of the first capacitor C1 is also respectively connected to the first end of the second resistor R2 and the gate of the second MOS transistor Q2. The second end of the second resistor R2 is connected to the drain of the third MOS transistor Q3, the gate of the third MOS transistor Q3 is connected to one end of the main chip, and the source of the third MOS transistor Q3 is grounded.

[0044] Among them, a soft start circuit is formed between the second resistor R2 and the first capacitor C1 to avoid excessive instantaneous peak current. The resistance values of the first resistor R1, the second resistor R2, and the first capacitor C1 can be adjusted separately according to the actual situation, but it is necessary to ensure that the voltage between V-G and V-S is greater than the turn-on voltages of the first MOS transistor Q1 and the second MOS transistor Q2, and the soft start peak current meets the requirements. The magnitude of the peak current is evaluated according to the maximum current that can be provided by the power supply (VIN) used and shall not be greater than the maximum current that the power supply can provide.

[0045] In a preferred embodiment, the power supply switching device for power supply control and HDMI conversion further includes:

[0046] A main chip module for detecting whether a slave device is connected to the TYPE C to HDMI module through the CC pin on the TYPE C line and controlling the operation of the power supply switching device according to the detected connection result.

[0047] In a preferred embodiment, the third terminal of the power supply switching device is connected to the main chip module; specifically, the first terminal of the switch drive circuit module in the power supply switching device is connected to the main chip module, and the second terminal of the switch drive circuit module in the power supply switching device is connected to the third terminal of the power supply switch circuit module.

[0048] In a preferred embodiment, the soft start circuit module is connected to the fourth terminal of the power supply switch circuit module.

[0049] Specifically, as Figure 3 shown, after the main chip is connected to the TYPE C interface of the slave device through the TYPE C line, the main chip detects whether a TYPE C to HDMI module is connected through the CC pin (including CC1 and CC2) on the TYPE C line, and thus judges and controls the power supply switching circuit device through the output level signal, where the output terminal of the power supply switching circuit device is connected to the TYPE C interface of the slave device.

[0050] In a preferred embodiment, the power supply switching device for power supply control and HDMI conversion further includes:

[0051] A TYPE C to HDMI module for the slave device to connect to the host through a TYPE C female head to HDMI optional module installed on the TYPE C line.

[0052] Specifically, in this embodiment, the TYPE C interface of the PC is connected to the TYPE C interface of the slave device (extended screen), and the HDMI interface of the PC is connected to the TYPE C interface of the extended screen by using an HDMI to TYPE C adapter. These two methods are combined together. A TYPE C female to HDMI selectable module connected to the TYPE C cable is used to achieve the combination. And the slave device itself is an extended screen device, and its TYPE C interface can determine whether to supply power externally according to whether the TYPE C female to HDMI selectable module on the TYPE C cable is connected.

[0053] A power switching device for power supply control and HDMI conversion provided in this embodiment includes a power switching switch circuit module, a switch driving circuit module, and a soft start circuit module respectively connected to the power switching switch circuit module; wherein, the power switching switch circuit module is used to switch the power supply for the external power supply of the slave device and prevent power backflow; the switch driving circuit module is used to control the power switch of the slave device by using a signal; the soft start circuit module is used to optimize the peak current of the system so that the peak current of the system soft start meets the preset requirements.

[0054] This embodiment can realize the power supply master-slave switching without changing the roles of the master and slave devices, so as to realize the power supply for the TYPE C to HDMI module, and combine the TYPE C interface and the HDMI interface into one without increasing the cost and additional power supply, realizing compatibility with most PCs, so that most PCs can be connected to an extended screen with an external TYPE C interface.

[0055] The second embodiment of the present invention:

[0056] Please refer to Figure 2-6 。

[0057] As Figure 4 shown, this embodiment provides a control method for a power switching device for power supply control and HDMI conversion, including the following steps:

[0058] Detect whether the CC pin on the TYPE C cable of the TYPE C interface of the slave device is connected to the TYPE C to HDMI module through the main chip module;

[0059] If so, after controlling the level signal of the switch driving circuit module connected to the power switching device to be a high level signal through the main chip module, control the power supply of the slave device to the TYPE C to HDMI module through the power switching switch circuit module, so that the slave device supplies power to the HDMI interface of the host through the TYPE C to HDMI module;

[0060] If not, the main chip module controls the level signal of the switch drive circuit module connected to the power switch device to be a low-level signal, and the slave power supply is disconnected from supplying power to the TYPE C to HDMI module through the power switch circuit module, so that the slave is connected to the TYPE C interface of the host through the TYPE C cable.

[0061] Specifically, as Figure 5 shown, MTOUCHII itself acts as an extended screen device and always acts as a slave, while the PC acts as the host. When connected to the TYPE C interface of the PC, it actually acts as a slave and does not supply power externally; however, when the TYPE C to HDMI module is connected, it needs to supply power to the HDMI module externally, that is, it is equivalent to acting as the host. Originally as a TYPE C port, if the TYPE C standard protocol port is used, when the power is output, the MTOUCHII extended screen will become the host and output video signals externally, which is contrary to our application requirements. Although the existing method can add a PD chip to switch the power, it will increase the cost. Therefore, a power switch circuit is needed to only switch the power master-slave and does not affect the data master-slave roles.

[0062] In a specific embodiment, as Figure 6 shown, first, the slave detects whether the HDMI conversion module is connected through the CC pins on the TYPE C cable. If not, the power switch device controls the TYPE C port of the slave not to supply power externally, and only conducts data transmission connection with the TYPE C port of the PC host through the TYPE C cable; if it detects that the HDMI conversion module is connected, the power switch device controls the TYPE C port of the slave to supply power externally, and connects to the HDMI interface of the PC host through the TYPE C cable and the HDMI module for power supply connection.

[0063] Specifically, the circuit principle provided in this embodiment is as follows: as Figure 3 shown, after the TYPE C cable is connected to the TYPE C interface of MTOUCHII, the main chip detects whether the TYPE C to HDMI module is connected through the CC pins (including CC1 and CC2) on the TYPE C cable. Thus, the power switch circuit is judged and controlled. Due to the existence of the body diode of the first MOS transistor Q1 itself, there is a voltage from VIN passing through the diode at the S pole of the first MOS transistor Q1, that is, the S pole of the second MOS transistor Q2, which is V-S.

[0064] As Figure 2As shown, when access is detected, the main chip controls V_CTR to be at a high level. At this time, the third MOS transistor Q3 is turned on, and the second resistor R2 is pulled down to GND. V-S is divided by the first resistor R1 and the second resistor R2 to obtain V-G. The voltage between V-G and V-S should be greater than the turn-on voltages of the first MOS transistor Q1 and the second MOS transistor Q2. At this time, both the first MOS transistor Q1 and the second MOS transistor Q2 are turned on, and VIN outputs VOUT through the two turned-on MOS transistors. A soft-start circuit is formed between the second resistor R2 and the first capacitor C1 to avoid excessive inrush current at startup. The resistance values of the first resistor R1, the second resistor R2, and the first capacitor C1 can be adjusted separately according to the actual situation, but it is necessary to ensure that the voltage between V-G and V-S is greater than the turn-on voltages of the first MOS transistor Q1 and the second MOS transistor Q2, and the inrush current at startup meets the requirements. The magnitude of the inrush current is evaluated according to the maximum current that the used power supply (VIN) can provide, and it should not be greater than the maximum current that the power supply can provide.

[0065] When access is not detected, the main chip controls V_CTR to be at a low level. At this time, the third MOS transistor Q3 is turned off, and the second resistor R2 is floating. There is no current flowing through the first resistor R1 for V-S, and it is at the same potential as V-G. The voltage between V-G and V-S is less than the turn-on voltages of the first MOS transistor Q1 and the second MOS transistor Q2. At this time, both the first MOS transistor Q1 and the second MOS transistor Q2 are turned off. The VOUT output by the PC reaches VS through the body diode of the second MOS transistor Q2 and cannot reach the system power supply VIN through the first MOS transistor Q1. Therefore, it will not affect the system, thus preventing power backflow.

[0066] This embodiment can realize the power supply master-slave switch of the TYPE C to HDMI module without changing the master-slave role, so as to realize the power supply to the TYPE C to HDMI module. Without increasing costs and additional power supplies, the TYPE C interface and the HDMI interface are combined into one, achieving compatibility with most PCs, so that most PCs can be connected to an external extended screen with a TYPE C interface.

[0067] In the above embodiments of the present invention, the descriptions of each embodiment have their own emphases. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0068] In several embodiments provided by the present application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are merely illustrative. For example, the division of the modules can be a logical function division. In actual implementation, there can be other division methods. For example, multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or direct coupling or communication connection between each other can be through some interfaces, and the indirect coupling or communication connection of units or modules can be in an electrical or other form.

[0069] The modules described as separate components may or may not be physically separated. The components displayed as modules may or may not be physical modules, that is, they can be located in one place or distributed to multiple modules. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0070] In addition, in each embodiment of the present invention, the functional modules can be integrated in a processing module, or each module can exist physically alone, or two or more modules can be integrated in one module. The above integrated modules can be implemented in the form of hardware or in the form of software functional modules.

[0071] The above is the preferred implementation manner of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and deformations can be made, and these improvements and deformations are also regarded as the protection scope of the present invention.

[0072] Those of ordinary skill in the art can understand that all or part of the processes in the above method embodiments can be completed by instructing relevant hardware through a computer program. The program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the above method embodiments. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM), etc.

Claims

1. A power switching device for power supply control and HDMI conversion, characterized in that, It includes a power switching switch circuit module, as well as a switch driving circuit module and a soft start circuit module respectively connected to the power switching switch circuit module; the third end of the power switching device is connected to a main chip module; wherein, The power switching switch circuit module is used to switch the power supply for the external power supply of the slave device and prevent power backflow; The switch driving circuit module is used to control the power switch of the slave device by using a signal; The soft start circuit module is used to optimize the system startup peak current so that the system startup peak current meets the preset requirements; The main chip module is used to detect whether the slave device is connected to the TYPE C to HDMI module and control the operation of the power switching device according to the detected connection result; The TYPE C to HDMI module is used for the slave device to connect to the host through a TYPE C female to HDMI optional module installed on the TYPE C line; The controlling the operation of the power switching device according to the detected connection result is specifically: The main chip module controls the level signal accessing the power switching device according to the detected connection result, so as to control the power supply of the slave device to maintain or disconnect the power supply to the TYPE C to HDMI module through the power switching device; when the power switching device controls the power supply of the slave device to disconnect the power supply to the TYPE C to HDMI module, the slave device is connected to the TYPE C interface of the host through the TYPE C line.

2. The power switching device for power supply control and HDMI conversion according to claim 1, wherein The first end of the power switching device accesses the power supply for the external power supply of the slave device, and the second end of the power switching device is connected to the TYPE C interface of the slave device; Specifically, the first end of the power switching switch circuit module in the power switching device accesses the power supply for the external power supply of the slave device, and the second end of the power switching switch circuit module in the power switching device is connected to the TYPE C interface of the slave device.

3. The power switching device for power supply control and HDMI conversion according to claim 2, characterized in that, Specifically, the first end of the switch driving circuit module in the power switching device is connected to the main chip module, and the second end of the switch driving circuit module in the power switching device is connected to the third end of the power switching switch circuit module.

4. The power switching device for power supply control and HDMI conversion according to claim 3, wherein The soft start circuit module is connected to the fourth end of the power switching switch circuit module.

5. A control method for a power switching device for power supply control and HDMI conversion as described in any one of claims 1 to 4, characterized in that, It at least includes the following steps: Detect whether the CC pin on the TYPE C line of the TYPE C interface of the slave device is connected to the TYPE C to HDMI module through the main chip module; If so, after controlling the level signal of the switch driving circuit module accessing the power switching device by the main chip module to be a high level signal, control the power supply of the slave device to supply power to the TYPE C to HDMI module through the power switching switch circuit module, so that the slave device supplies power to the HDMI interface of the host through the TYPE C to HDMI module; If not, the main chip module controls the level signal of the switch drive circuit module connected to the power supply switching device to be a low-level signal, and the power supply switching switch circuit module disconnects the power supply of the slave machine from the TYPE C to HDMI module, so that the slave machine is connected to the TYPE C interface of the host through the TYPE C cable.

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