Vehicle-mounted fast charging circuit with Type-C mobile phone interconnection screen projection function

Abstract

A vehicle-mounted fast charging circuit with a Type-C mobile phone interconnection screen projection function belongs to the technical field of vehicle-mounted screen projection and charging, and comprises a Type-C connection module, a PD control module U6, a boost-buck module U7, a multiplex switch U2 and a video string adding module U1, the Type-C connection module is connected with the PD control module U6, the boost-buck module U7 and the multiplex switch U2, the PD control module U6 is connected with the boost-buck module U7, the multiplex switch U2 is connected with the PD control module U6, and the PD control module U6 is connected with the boost-buck module U7. The video string adding module U1 is connected with a deserializer of a vehicle-mounted screen, the vehicle-mounted fast charging circuit further comprises an MCU module U8, and the MCU module U8 is connected with the PD control module U6, the multiplex switch U2 and the video string adding module U1 through an I2C bus. By improving the control logic of the circuit, screen projection can be carried out while charging is carried out, hardware resources are greatly saved, and the signal stability is improved at the same time.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of vehicle-mounted screen projection and charging, and particularly relates to a vehicle-mounted fast charging circuit with Type-C mobile phone interconnection screen projection function. BACKGROUND

[0002] With the promotion of the intelligentization of new energy vehicles, most of the USB charging ports in the new energy vehicles on the current market only have charging functions, and few of them are connected to large screens such as in-vehicle central control screens for screen projection, and some vehicles use Bluetooth and other ways to wirelessly connect mobile phones and central control screens, and the stability of this connection mode is relatively poor.

[0003] The prior art discloses a vehicle-mounted fast charging circuit with the announcement number CN210957852U and the announcement date of 2020.07.07, and relates to the field of vehicle-mounted fast charging. The vehicle-mounted fast charging circuit is characterized by comprising a Type-C circuit and a USB-A circuit, wherein the Type-C circuit is electrically connected with the USB-A circuit; the USB-A circuit comprises a first voltage reduction module and a first control module, the first voltage reduction module and the first control module are both connected with a USB-A connector, the first voltage reduction module and the first control module are used for controlling the USB-A connector to output several kinds of direct current; the Type-C circuit comprises a second voltage reduction module and a second control module, the second voltage reduction module and the second control module are both connected with a USB Type C connection module, the second voltage reduction module and the second control module are used for controlling the USB Type C connection module to output several kinds of direct current, the circuit can also be welded in two panels, and has great development space. However, the USB interface carried by the circuit cannot simultaneously support PD high-power fast charging and screen projection, and has problems such as slow charging, lack of audio and video entertainment functions, inability to perform mobile terminal video sharing and interconnection, and poor function integration.

[0004] Therefore, how to design a vehicle-mounted fast charging circuit that can charge and project at the same time, save hardware resources, and improve signal stability. SUMMARY

[0005] The utility model solves the technical problem of providing a vehicle-mounted fast charging circuit with Type-C mobile phone interconnection screen projection function, which can project while charging through the improvement of the control logic of the circuit, greatly saving hardware resources and improving signal stability.

[0006] The utility model discloses a technical scheme is: a kind of vehicle-mounted fast charging circuit with Type-C mobile phone interconnection projection function, including Type-C connection module, PD control module U6, boost and buck module U7, multiplex switch U2, video plus string module U1, the Type-C connection module is connected with PD control module U6, boost and buck module U7, multiplex switch U2 respectively, the PD control module U6 is connected with boost and buck module U7, the video plus string module U1 is connected with the deserializer of vehicle-mounted screen, the vehicle-mounted fast charging circuit further include MCU module U8, MCU module U8 is connected with PD control module U6, multiplex switch U2, video plus string module U1 by means of I 2 C bus is connected with PD control module U6, multiplex switch U2, video plus string module U1.

[0007] Further, the MCU module is chip KF8A100DTD, the PD control module is Nanxin SC2021Q, the boost and buck module is chip SC8741Q, and the multiplex switch is chip PS8742V;The A5 pin and B5 pin of Type-C connection module are connected with the 27 pin and No. 26 pin of Nanxin SC2021Q respectively;The A6 pin and B6 pin of Type-C connection module are connected with the 27 pin of Nanxin SC2021Q;The A7 pin and B7 pin of Type-C connection module are connected with the 24 pin of Nanxin SC2021Q;The A2 pin, A3 pin, B10 pin, B11 pin, A10 pin, A11 pin, B2 pin and B3 pin of Type-C connection module are connected with the No. 9 pin, No. 11 pin, No. 13 pin, No. 12 pin, No. 15 pin, No. 16 pin, No. 19 pin and No. 18 pin of chip PS8742V respectively;The No. 8 pin and No. 9 pin of Nanxin SC2021Q are connected with the No. 1 pin and No. 2 pin of chip SC8741Q respectively;The No. 19 pin, No. 11 pin, No. 12 pin of Nanxin SC2021Q are connected with the No. 11 pin, No. 2 pin and No. 3 pin of chip KF8A100DTD respectively;The No. 2 pin and No. 3 pin of chip KF8A100DTD are connected with the No. 21 pin and No. 22 pin of chip PS8742V respectively.

[0008] Further, the video plus stringer U1 is chip MAX96745;The No. 36 pin, No. 37 pin, No. 39 pin, No. 40 pin, No. 45 pin, No. 46 pin, No. 48 pin and No. 49 pin of chip MAX96745 are connected with the No. 40 pin, No. 39 pin, No. 37 pin, No. 36 pin, No. 34 pin, No. 33 pin, No. 31 pin and No. 30 pin of chip PS8742V respectively;The No. 50 pin of chip MAX96745 is connected with the No. 32 pin of chip PS8742V and the No. 15 pin of Nanxin SC2021Q respectively.

[0009] Further, the No. 4 pin and the No. 12 pin of the chip MAX96745 are connected with the No. 8 pin and the No. 9 pin of the chip KF8A100DTD respectively.

[0010] Further, the No. 20 pin and the No. 34 pin of the chip MAX96745 are connected with the deserializer of the vehicle screen through the intermediate connector J3.

[0011] The utility model discloses the beneficial effect that produces: through the improvement of the control logic of circuit, can carry out the screen projection while charging, greatly save hardware resources while improving the stability of signal, the utility model discloses the dependence of the purchased chip is little, can conveniently debug change, and the expansibility is high. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is the structural diagram of the utility model;

[0013] Figure 2 It is the circuit diagram of the connection relationship of Type-C connection module, PD control module and boost and buck module;

[0014] Figure 3 It is the circuit diagram of MCU module;

[0015] Figure 4 It is the circuit diagram of multiplexing switch;

[0016] Figure 5 It is the circuit diagram of video and string module. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical scheme and advantage of the utility model embodiment more clear, the technical scheme in the utility model embodiment will be clearly and completely described below with the drawings in the utility model embodiment.

[0018] Referring to the drawings Figures 1-5 A vehicle-mounted fast charging circuit with Type-C mobile phone interconnection screen projection function, comprising a Type-C connection module, a PD control module U6, a boost and buck module U7, a multiplexing switch U2 and a video and string module U1, the Type-C connection module is connected with the PD control module U6, the boost and buck module U7 and the multiplexing switch U2, the PD control module U6 is connected with the boost and buck module U7, the video and string module U1 is connected with the deserializer of the vehicle screen, and the vehicle-mounted fast charging circuit further comprises an MCU module U8. 2 The C bus is connected with the PD control module U6, the multiplexing switch U2 and the video and string module U1.

[0019] The MCU module is chip KF8A100DTD, the PD control module is Nanjing Chip SC2021Q, the step-up and step-down module is chip SC8741Q, and the multiplexing switch is chip PS8742V; the A5 pin and the B5 pin of the Type-C connection module are connected with the 27 pin and the 26 pin of Nanjing Chip SC2021Q respectively; the A6 pin and the B6 pin of the Type-C connection module are connected with the 27 pin of Nanjing Chip SC2021Q; the A7 pin and the B7 pin of the Type-C connection module are connected with the 24 pin of Nanjing Chip SC2021Q; the A2 pin, the A3 pin, the B10 pin, the B11 pin, the A10 pin, the A11 pin, the B2 pin and the B3 pin of the Type-C connection module are connected with the 9 pin, the 11 pin, the 13 pin, the 12 pin, the 15 pin, the 16 pin, the 19 pin and the 18 pin of chip PS8742V respectively; the 8 pin and the 9 pin of Nanjing Chip SC2021Q are connected with the 1 pin and the 2 pin of chip SC8741Q respectively; the 19 pin, the 11 pin and the 12 pin of Nanjing Chip SC2021Q are connected with the 11 pin, the 2 pin and the 3 pin of chip KF8A100DTD respectively;

[0020] The 2 pin and the 3 pin of chip KF8A100DTD are connected with the 21 pin and the 22 pin of chip PS8742V respectively.

[0021] The video serializer U1 is chip MAX96745; the 36 pin, the 37 pin, the 39 pin, the 40 pin, the 45 pin, the 46 pin, the 48 pin and the 49 pin of chip MAX96745 are connected with the 40 pin, the 39 pin, the 37 pin, the 36 pin, the 34 pin, the 33 pin, the 31 pin and the 30 pin of chip PS8742V respectively; the 50 pin of chip MAX96745 is connected with the 32 pin of chip PS8742V and the 15 pin of Nanjing Chip SC2021Q respectively. The 4 pin and the 12 pin of chip MAX96745 are connected with the 8 pin and the 9 pin of chip KF8A100DTD respectively. The 20 pin and the 34 pin of chip MAX96745 are connected with the deserializer of the vehicle-mounted screen through the intermediate connector J3.

[0022] In the specific implementation, the control signal part of each module is as follows.

[0023] After the external device is connected through the Type-C connection module, the A5 pin and the B5 pin of the Type-C connection module are connected with the 27 pin and the 26 pin of the Nantian SC2021Q respectively, which are used to identify the positive and negative insertion of the external device. The positive and negative insertion signal INT is transmitted to the 11 pin of the chip KF8A100DTD through the 19 pin of the Nantian SC2021Q. The chip KF8A100DTD further transmits the signal to the 2 pin and the 3 pin of the chip KF8A100DTD through the 2 pin and the 3 pin of the I 2 The C bus transmits the positive and negative insertion signal to the 21 pin and the 22 pin of the chip PS8742V, and the U2 chip PS8742V configures the internal link according to the positive and negative insertion signal, and opens the screen projection data link.

[0024] The Nantian SC2021Q also transmits the information of whether the external device is inserted and whether it supports screen projection, and the information of power overvoltage, undervoltage and overcurrent through the 11 pin and the 12 pin of the I 2 The C bus bus transmits to the 2 pin and the 3 pin of the chip KF8A100DTD, and the chip KF8A100DTD transmits these information to the 4 pin and the 12 pin of the chip MAX96745 through the 8 pin and the 9 pin of the analog I 2 The C bus transmits these information to the 4 pin and the 12 pin of the chip MAX96745, and the 20 pin of the chip MAX96745 transmits the information to the vehicle screen through the intermediate connector J3.

[0025] After the chip MAX96745 is powered on, it performs basic configuration with the vehicle screen through the intermediate connector J3, and after the configuration is completed, the 50 pin HPD of the chip MAX96745 is set to high level. The signal after the high level is transmitted to the 32 pin of the chip PS8742V and the 15 pin of the Nantian SC2021Q respectively. At this time, it indicates that the vehicle screen is ready and can be projected.

[0026] Screen projection data transmission part: as follows.

[0027] The screen projection data is transmitted to the corresponding pins of the chip PS8742V through the 8 ports of the Type-C connection module, and their corresponding relationship is shown in Table 1:

[0028] Table 1

[0029]

[0030] After the screen projection data is processed by the chip PS8742V, it is transmitted to the chip MAX96745, and the corresponding relationship is shown in Table 2:

[0031] Table 2

[0032]

[0033] The screen projection data is transmitted to the intermediate connector J3 after being processed by the chip MAX96745, and the corresponding relationship is as shown in Table 3:

[0034] Table 3

[0035]

[0036] The charging part is as follows.

[0037] An external 9-16V voltage is input through the module J1. The south chip SC2021Q communicates with the client through the Type-C connection module (the corresponding relationship is as shown in Table 4), and after determining the power supply demand, the south chip SC2021Q outputs the voltage and current required by the client in cooperation with the chip SC8741Q (the corresponding relationship is as shown in Table 5). The four pins of the Type-C connection module A4, A9, B4 and B9 supply power to the client. 2

[0038] Table 4

[0039]

[0040] Table 5

[0041] Network Nuvoton SC2021Q Chip SC8741Q SCL_M 8 1 SDA_M 9 2

[0042] After the power is turned on, the chip KF8A100DTD initializes and configures the chip MAX96745, reads the pin state of the chip SC2021Q to obtain the positive and negative insertion state of CC1 / CC2, and finally configures the register of the chip PS8742V. Another function of the chip KF8A100DTD is to transmit the fault code occurring in the screen projection process.

[0043] The specific control logic is: the chip SC2021Q gives the positive and negative insertion state of the Type-C connection module CC1 / CC2 to the chip KF8A100DTD, and after the chip KF8A100DTD judges the signal change, it configures the register in the chip PS8742V through the I 2 C bus. At the same time, the chip SC2021Q also collects fault codes such as under-voltage, over-voltage and over-current in the charging and screen projection process and transmits them to the chip KF8A100DTD as fault prompt signals. When the chip KF8A100DTD collects the signal change of this pin, it reads the corresponding fault information of the chip SC2021Q through the I 2 C bus, and then transmits it to the chip MAX96745. The chip MAX96745 reads the corresponding fault information through the I 2 C bus connected with the chip KF8A100DTD and displays it on the screen to remind the owner to check the equipment.​

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not limited thereto; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A vehicle-mounted fast charging circuit with Type-C mobile phone interconnection projection function, comprising a Type-C connection module, a PD control module U6, a boost-buck module U7, a multiplexing switch U2, a video plus serial module U1, the Type-C connection module is connected with the PD control module U6, the boost-buck module U7 and the multiplexing switch U2 respectively, the PD control module U6 is connected with the boost-buck module U7, and the video plus serial module U1 is connected with a deserializer of a vehicle-mounted screen, characterized in that: The vehicle-mounted fast charging circuit further comprises an MCU module U8, the MCU module U8 is connected with the I 2 The C bus is connected with the PD control module U6, the multiplexing switch U2 and the video adding module U1.

2. The on-board fast charging circuit of claim 1, wherein: The MCU module is a chip KF8A100DTD, the PD control module is a Nanxin SC2021Q, the step-up and step-down module is a chip SC8741Q, and the multiplexing switch is a chip PS8742V; The A5 pin and the B5 pin of the Type-C connection module are connected with the 27 pin and the 26 pin of the Nanxin SC2021Q respectively; The A6 pin and the B6 pin of the Type-C connection module are connected with the 27 pin of the Nanxin SC2021Q; The A7 pin and the B7 pin of the Type-C connection module are connected with the 24 pin of the Nanxin SC2021Q; The A2 pin, the A3 pin, the B10 pin, the B11 pin, the A10 pin, the A11 pin, the B2 pin and the B3 pin of the Type-C connection module are connected with the 9 pin, the 11 pin, the 13 pin, the 12 pin, the 15 pin, the 16 pin, the 19 pin and the 18 pin of the chip PS8742V respectively; The 8 pin and the 9 pin of the Nanxin SC2021Q are connected with the 1 pin and the 2 pin of the chip SC8741Q respectively; The 19 pin, the 11 pin and the 12 pin of the Nanxin SC2021Q are connected with the 11 pin, the 2 pin and the 3 pin of the chip KF8A100DTD respectively; The 2 pin and the 3 pin of the chip KF8A100DTD are connected with the 21 pin and the 22 pin of the chip PS8742V respectively.

3. The on-board fast charging circuit of claim 2, wherein: The video serializer U1 is a chip MAX96745; The 36 pin, the 37 pin, the 39 pin, the 40 pin, the 45 pin, the 46 pin, the 48 pin and the 49 pin of the chip MAX96745 are connected with the 40 pin, the 39 pin, the 37 pin, the 36 pin, the 34 pin, the 33 pin, the 31 pin and the 30 pin of the chip PS8742V respectively; The 50 pin of the chip MAX96745 is connected with the 32 pin of the chip PS8742V and the 15 pin of the Nanxin SC2021Q respectively.

4. The on-board fast charging circuit of claim 3, wherein: The 4 pin and the 12 pin of the chip MAX96745 are connected with the 8 pin and the 9 pin of the chip KF8A100DTD respectively.

5. The on-board fast charging circuit of claim 3, wherein: The 20 pin and the 34 pin of the chip MAX96745 are connected with the deserializer of the vehicle-mounted screen through the intermediate connector J3.

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