Device for realizing power supply from DP interface to USB-C interface

Abstract

The utility model discloses a device for realizing power supply from a DP interface to a USB-C interface. The device comprises the USB-C interface, the DP interface, a PD processor and a power supply circuit, an AUX signal is transmitted between the DP interface and the USB-C interface; the PD processor is connected between the USB-C interface and the DP interface; the power supply circuit is respectively connected with the USB-C interface, the PD processor and the DP interface; the PD processor can acquire a state signal from the DP interface and enable the power supply circuit to acquire the state signal from the DP interface and convert the state signal into a voltage required by the USB-C interface; through the above structure, a USB-C to DP cable without a charging function can take power from the DP interface of the display device, and a single USB-C interface projection screen device can be charged while being connected with a DP display for projection screen display, thereby realizing long-term projection screen display, being more convenient and easier to use, and saving cost and power adapter resources.

Description

Technical Field

[0001] The utility model relates to the field of DP signal transmission devices, and in particular to a device for realizing power supply from a DP interface to a USB-C interface. Background Art

[0002] Currently, portable screen projection devices such as mobile phones on the market generally use a single USB-C interface. In these devices, charging and screen projection are achieved through the USB-C interface. The USB-C interface of the screen projection device is connected to the display with the DP interface input through a USB-C to DP cable for screen projection. The USB-C interface of the screen projection device is charged by connecting a power adapter. However, screen projection devices with a single USB-C interface such as mobile phones have limited battery life. Therefore, if they are not charged after projection, the projection function cannot be used for a long time. After the battery is exhausted, the device will shut down and will not project the screen until the screen projection device is recharged with a power adapter before it can continue to project the screen.

[0003] The USB-C to DP cable that connects the projection device and the monitor with DP interface input can be roughly divided into two types according to whether it has a charging function: the first type has one USB-C interface for connecting the projection device and another USB-C interface for connecting the power adapter. This type can charge the projection device while projecting the screen, so that the phone can always project the screen; the second type of USB-C to DP cable has only one USB-C port, which is used to connect a projection device with a single USB-C interface. This cable can only project the screen to projection devices such as mobile phones, but cannot charge them. It cannot meet the needs of the mobile phone to project the screen all the time, which is inconvenient in the user experience.

[0004] Therefore, there is an urgent need for a device that enables the DP interface to supply power to the USB-C interface to solve the above problems. Utility Model Content

[0005] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a device for realizing power supply from a DP interface to a USB-C interface.

[0006] An embodiment of the utility model adopts a technical solution to solve the technical problem: a device for realizing power supply from a DP interface to a USB-C interface, comprising a USB-C interface, a DP interface, a PD processor and a power supply circuit;

[0007] The USB-C port is connected to the projection device to receive the DP signal sent by the projection device;

[0008] The DP interface is connected to the USB-C interface and the display device respectively. The DP interface is used to send DP signals to the display device;

[0009] The PD processor is connected between the USB-C interface and the DP interface;

[0010] The power supply circuit is connected to the USB-C interface, the PD processor and the DP interface respectively. The PD processor can obtain the status signal from the DP interface and enable the power supply circuit to obtain and convert the voltage required by the USB-C interface at the DP interface.

[0011] As one of the preferred embodiments of the present utility model, the power supply circuit includes a DC converter and a power path management module;

[0012] The DC converter is connected between the PD processor and the DP interface, and is used to obtain and convert the voltage required by the USB-C interface from the DP interface;

[0013] The power path management module is connected between the USB-C interface, the PD processor and the DC converter, and is used to control the power supply path of the DC converter to the power path management module, the VBUS power input and output path of the USB-C interface to the power path management module, and the power supply path of the power path management module to the PD processor.

[0014] As one of the preferred embodiments of the present utility model, the DC converter is configured as a Boost circuit for converting the 3.3V outputted by the DP_PWR pin of the DP interface into 5V-20V.

[0015] As one of the preferred embodiments of the present utility model, the DC converter is configured as a Buck step-down circuit for converting 5V, 12V or 18V outputted by the DP_PWR pin of the DP interface into 5V-18V.

[0016] As one of the preferred embodiments of the present utility model, the DC converter is configured as a Buck-Boost step-up / step-down circuit for converting 3.3V, 5V, 12V or 18V outputted by the DP_PWR pin of the DP interface into 5-20V.

[0017] As one of the preferred embodiments of the utility model, the power path management module includes a MOS tube Q1 and a MOS tube Q2, the source of the MOS tube Q1 is connected to the VBUS pin of the USB-C interface, the drain of the MOS tube Q1 is connected to the power supply end of the PD processor and the drain of the MOS tube Q2, the source of the MOS tube Q2 is connected to the DC converter, and the gate of the MOS tube Q1 and the gate of the MOS tube Q2 are controlled by the PD processor.

[0018] As one of the preferred embodiments of the utility model, a device for realizing power supply from the DP interface to the USB-C interface also includes an AUX control module connected to the USB-C interface, the DP interface and the PD processor respectively. The AUX control module can be controlled by the PD processor and read and configure the output voltage of the DP_PWR pin of the DP interface.

[0019] As one of the preferred embodiments of the utility model, a device for realizing power supply from the DP interface to the USB-C interface also includes a sampling resistor R1, one end of the sampling resistor R1 is respectively connected to the GND pin of the USB-C interface and the PD processor, and the other end of the sampling resistor R1 is respectively connected to the PD processor and the ground terminal, for detecting the current of the USB-C interface.

[0020] The beneficial effects of the utility model include: a device for realizing power supply from the DP interface to the USB-C interface, comprising a USB-C interface, a DP interface, a PD processor and a power supply circuit; the USB-C interface is connected to a screen projection device, and is used to receive a DP signal sent by the screen projection device; the DP interface is respectively connected to the USB-C interface and the display device, and the DP interface is used to send a DP signal to the display device; the PD processor is connected between the USB-C interface and the DP interface; the power supply circuit is respectively connected to the USB-C interface, the PD processor and the DP interface, and the PD processor can obtain a status signal from the DP interface and enable the power supply circuit to obtain and convert the voltage required by the USB-C interface at the DP interface; through the above structure, a USB-C to DP cable without a charging function can be powered by the DP interface of the display device, so that a single USB-C interface screen projection device can be charged while being connected to a DP display for screen projection display, thereby realizing long-term screen projection display, being more convenient and easy to use, saving costs and power adapter resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0022] Figure 1 The present invention is a functional block diagram of a device for realizing power supply from a DP interface to a USB-C interface;

[0023] Figure 2 This is an electrical structure diagram of a first embodiment of a device for implementing power supply from a DP interface to a USB-C interface;

[0024] Figure 3 This is an electrical structure diagram of a second embodiment of a device for realizing power supply from a DP interface to a USB-C interface. DETAILED DESCRIPTION

[0025] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0026] In the description of the present utility model, the meaning of "more than" is more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0027] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0028] In the present invention, unless otherwise clearly defined, the words "set", "install", "connect" and the like should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium; they can be fixedly connected or detachably connected or integrally formed; they can be mechanically connected; they can be the internal connection of two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0029] Reference Figures 1 to 3 , a device for realizing power supply from a DP interface to a USB-C interface, comprising a USB-C interface, a DP interface, a PD processor and a power supply circuit;

[0030] The USB-C port is connected to the projection device to receive the DP signal sent by the projection device;

[0031] The DP interface is connected to the USB-C interface and the display device respectively. The DP interface is used to send DP signals to the display device;

[0032] The PD processor is connected between the USB-C interface and the DP interface;

[0033] The power supply circuit is connected to the USB-C interface, the PD processor and the DP interface respectively. The PD processor can obtain the status signal from the DP interface and enable the power supply circuit to obtain and convert the voltage required by the USB-C interface at the DP interface.

[0034] In this utility model, its working principle is as follows:

[0035] ①Reference Figure 1 The USB-C interface can connect to the USB-C screen projection device and receive the DP signal sent by the video source. The PD processor realizes the handshake connection with the screen projection device through the CC pin of the USB-C interface, and completes the two-way communication of power and DP A lt mode configuration to determine the charging power and screen projection configuration of the screen projection device; the DP interface can connect to the display device input by the DP interface and send a DP signal to the display device. The DP interface reports the current status of the display device to the PD processor through the status signal, and completes the two-way communication of display information with the USB-C interface through the AUX signal; and a power supply circuit is also connected between the USB-C interface, the PD processor and the DP interface. As a preferred embodiment of the power supply circuit, the power supply circuit includes a DC converter and a power path management module; the DC converter is connected between the PD processor and the DP interface; the power path management module is connected between the USB-C interface, the PD processor and the DC converter; the DC converter can convert the power supply voltage obtained from the DP interface into the voltage required by the USB-C interface, and the DC converter is enabled and disabled by the PD processor.

[0036] ②Reference Figure 2, as an electrical structure diagram of the first embodiment of a device for realizing power supply from the DP interface to the USB-C interface, the PD processor is connected to the CC pin of the USB-C interface, realizes the handshake connection between the projection device and the screen projection device, and performs two-way communication coordination of power and DP Alt mode configuration to determine the charging power and projection configuration of the projection device; the PD processor connects the sampling resistor R1 through the GND pin of the USB-C interface to perform current sampling, realize overcurrent and short circuit detection, and protect the subsequent circuit; the DC converter is set to a Boost boost circuit, which is used to boost the 3.3V voltage output by the DP_PWR pin of the DP interface by default to 5V-20V to meet the charging requirements of the USB-C interface; the power path circuit (power path management module) controls the power path of the entire system, including the power supply of the PD processor, the power supply of the USB-C interface, and the path management of the DP interface supplying power to the USB-C interface; as a preferred embodiment of the power path management module, the power path management module includes MOS MOS tube Q1 and MOS tube Q2, the source of MOS tube Q1 is connected to the VBUS pin of the USB-C interface, the drain of MOS tube Q1 is respectively connected to the power supply end of the PD processor and the drain of MOS tube Q2, the source of MOS tube Q2 is connected to the DC converter, and the gate of MOS tube Q1 and the gate of MOS tube Q2 are controlled by the PD processor; specifically, the PD processor sends turn-on and turn-off signals to the gate of MOS tube Q1 and the gate of MOS tube Q2, and different states of MOS tube Q1 and MOS tube Q2 determine the power supply path of the DC converter to the power path management module, the VBUS power input and output path of the USB-C interface to the power path management module, and the on-off of the power supply path of the power path management module to the PD processor.

[0037] When the DP interface is connected to the DP monitor, the output voltage of the Boost circuit is supplied to the PD processor through the freewheeling diode D2 of the MOS tube Q2. The PD processor controls the CC pin of the USB-C interface to pull up, turns on the MOS tube Q2 and turns off the MOS tube Q1 at the same time. After detecting that a device is inserted into the USB-C interface, the MOS tube Q1 is turned on, and the power and DP A lt mode configuration communication on the CC pin is completed. When overvoltage and overcurrent are detected on the sampling resistor R1, the MOS tube Q1 is turned off for circuit protection.

[0038] When the DP interface is not plugged into the monitor, or the DP interface is plugged into the monitor but the power communication on the CC pin of the USB-C interface fails, or is rejected by the device, the PD processor controls the CC pin to pull down, draws power from the USB-C interface through the freewheeling diode D1 of the MOS tube Q1, and turns off the MOS tube Q2 and the Boost circuit.

[0039] The Hot Pl ug Detect pin of the DP interface is connected to the PD processor, which sends an HPD signal to notify the status of the display. The AUX_CH pin of the DP interface is connected to the SBU pin of the USB-C interface. The two complete two-way communication of display information through the AUX signal, and finally realize the screen projection display of the projection device connected to the USB-C interface.

[0040] ③Reference Figure 3 , as an electrical structure diagram of the second embodiment of a device for realizing power supply from the DP interface to the USB-C interface, the PD processor is connected to the CC pin of the USB-C interface, realizes the handshake connection with the projection device and performs two-way communication coordination of power and DP Alt mode configuration, determines the charging power and DP A lt mode configuration; the PD processor connects the sampling resistor R1 through the GND pin of the USB-C interface to perform current sampling, realize overcurrent and short-circuit detection, and protect the subsequent circuit; the PD processor connects to the AUX control module to configure the AUX communication content. The AUX control module connects the SBU pin of the USB-C interface and the AUX_CH pin of the DP interface to transmit the AUX signal of the USB-C interface and the DP interface; the DP_PWR pin outputs a 3.3V voltage by default. The PD processor can configure the AUX control module to read and configure the output voltage of the DP_PWR pin of the DP interface. In addition to 3.3V, the output voltage of the DP_PWR pin of the DP interface can also output 5V, 12V and 18V; the Buck-Boost step-up and step-down circuit is used to control the conversion of the output voltage of the DP_PWR pin of the DP interface into the voltage required by the USB-C interface to meet the charging requirements of the USB-C interface; the power path circuit (power path management module) controls the entire The invention relates to a power supply path of a system, including power supply of a PD processor, power extraction of a USB-C interface, and path management of power supply from a DP interface to a USB-C interface; as a preferred embodiment of a power supply path management module, the power supply path management module includes a MOS tube Q1 and a MOS tube Q2, the source of the MOS tube Q1 is connected to the VBUS pin of the USB-C interface, the drain of the MOS tube Q1 is connected to the power supply end of the PD processor and the drain of the MOS tube Q2, the source of the MOS tube Q2 is connected to a DC converter, and the gate of the MOS tube Q1 and the gate of the MOS tube Q2 are controlled by the PD processor; specifically, the PD processor sends a turn-on and turn-off signal to the gate of the MOS tube Q1 and the gate of the MOS tube Q2, and different states of the MOS tube Q1 and the MOS tube Q2 determine the power supply path of the DC converter to the power supply path management module, the VBUS power input and output path of the USB-C interface to the power supply path management module, and the on and off of the power supply path of the power supply path management module to the PD processor.

[0041] When the DP interface is connected to the DP monitor, the output voltage of the Buck-Boost step-up and step-down circuit is used to power the PD processor through the freewheeling diode D2 of the MOS tube Q2. The PD processor controls the CC pin to pull up, turns on the MOS tube Q2 and turns off the MOS tube Q1 at the same time. After detecting that a device is inserted into the USB-C interface, the MOS tube Q1 is turned on, and the power on the CC pin and the DP A lt mode configuration bidirectional communication are completed. When overvoltage and overcurrent are detected on the sampling resistor R1, the MOS tube Q1 is turned off for circuit protection.

[0042] When the DP interface is not plugged into the monitor, or the DP interface is plugged into the monitor but the power communication on the CC pin of USB-C fails, or is rejected by the device, the PD processor controls the CC pin to pull down, draws power from the USB-C interface through the freewheeling diode D1 of the MOS tube Q1, and turns off the MOS tube Q2 and the Buck-Boost step-up and step-down circuit.

[0043] The Hot Pl ug Detect pin of the DP interface is connected to the PD processor, which sends an HPD signal to notify the status of the display. The AUX_CH pin of the DP interface and the SBU pin of the USB-C interface are respectively connected to the AUX control module. The two complete two-way communication of display information by transmitting the AUX signal, and finally realize the screen projection display of the projection device connected to the USB-C interface.

[0044] ④The advantage of the utility model is that: it can enable the USB-C to DP cable without charging function to draw power from the DP interface of the display device, so that the single USB-C interface screen projection device can be charged while connected to the DP display for screen projection display, thereby achieving long-term screen projection display, being more convenient and easy to use, saving costs and saving power adapter resources.

[0045] As a first embodiment of the DC converter, the DC converter is configured as a Boost circuit for converting 3.3V outputted by the DP_PWR pin of the DP interface into 5V-20V.

[0046] As a second embodiment of the DC converter, the DC converter is configured as a Buck step-down circuit for converting 5V, 12V or 18V outputted by the DP_PWR pin of the DP interface into 5V-18V.

[0047] As a third embodiment of the DC converter, the DC converter is configured as a Buck-Boost step-up / step-down circuit for converting 3.3V, 5V, 12V or 18V outputted by the DP_PWR pin of the DP interface into 5-20V.

[0048] A device for realizing power supply from a DP interface to a USB-C interface also includes an AUX control module connected to the USB-C interface, the DP interface and a PD processor respectively. The AUX control module can be controlled by the PD processor and read and configure the output voltage of the DP_PWR pin of the DP interface.

[0049] A device for realizing power supply from the DP interface to the USB-C interface also includes a sampling resistor R1, one end of the sampling resistor R1 is respectively connected to the GND pin of the USB-C interface and the PD processor, and the other end of the sampling resistor R1 is respectively connected to the PD processor and the ground terminal, for detecting the current of the USB-C interface.

[0050] Of course, the present invention is not limited to the above-mentioned embodiments, and technicians familiar with the field may make equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications and substitutions are all included in the scope defined by the claims of this application.

Claims

1. A device for realizing power supply from a DP interface to a USB-C interface, characterized in that: Including USB-C interface, DP interface, PD processor and power supply circuit; The USB-C interface is connected to the screen projection device and is used to receive the DP signal sent by the screen projection device; The DP interface is connected to the USB-C interface and the display device respectively, and the DP interface is used to send a DP signal to the display device; The PD processor is connected between the USB-C interface and the DP interface; The power supply circuit is respectively connected to the USB-C interface, the PD processor and the DP interface. The PD processor can obtain a status signal from the DP interface and enable the power supply circuit to obtain and convert the voltage required by the USB-C interface at the DP interface.

2. The device for realizing power supply from a DP interface to a USB-C interface according to claim 1, characterized in that: The power supply circuit includes a DC converter and a power path management module; The DC converter is connected between the PD processor and the DP interface, and is used to obtain and convert the voltage required by the USB-C interface from the DP interface; The power path management module is connected between the USB-C interface, the PD processor and the DC converter, and is used to control the power supply path of the DC converter to the power path management module, the VBUS power input and output path of the USB-C interface to the power path management module, and the power supply path of the power path management module to the PD processor.

3. The device for realizing power supply from the DP interface to the USB-C interface according to claim 2, characterized in that: The DC converter is configured as a Boost circuit for converting 3.3V outputted by the DP_PWR pin of the DP interface into 5V-20V.

4. The device for realizing power supply from a DP interface to a USB-C interface according to claim 2, characterized in that: The DC converter is configured as a Buck step-down circuit for converting 5V, 12V or 18V output by the DP_PWR pin of the DP interface into 5V-18V.

5. The device for realizing power supply from a DP interface to a USB-C interface according to claim 2, characterized in that: The DC converter is configured as a Buck-Boost step-up / step-down circuit, and is used to convert 3.3V, 5V, 12V or 18V outputted by the DP_PWR pin of the DP interface into 5-20V.

6. The device for realizing power supply from a DP interface to a USB-C interface according to claim 2, characterized in that: The power path management module includes a MOS tube Q1 and a MOS tube Q2, the source of the MOS tube Q1 is connected to the VBUS pin of the USB-C interface, the drain of the MOS tube Q1 is connected to the power supply end of the PD processor and the drain of the MOS tube Q2, the source of the MOS tube Q2 is connected to the DC converter, and the gate of the MOS tube Q1 and the gate of the MOS tube Q2 are controlled by the PD processor.

7. The device for realizing power supply from a DP interface to a USB-C interface according to claim 1, characterized in that: It also includes an AUX control module connected to the USB-C interface, the DP interface and the PD processor respectively. The AUX control module can be controlled by the PD processor to read and configure the output voltage of the DP_PWR pin of the DP interface.

8. The device for realizing power supply from a DP interface to a USB-C interface according to claim 1, characterized in that: It also includes a sampling resistor R1, one end of the sampling resistor R1 is respectively connected to the GND pin of the USB-C interface and the PD processor, and the other end of the sampling resistor R1 is respectively connected to the PD processor and the ground terminal, for detecting the current of the USB-C interface.

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