CN105098406A - Wire end connector - Google Patents

Abstract

A line-end connector, one end of which is used to be plugged into the board-end connector of the motherboard, and the other end is used to electrically connect with the display, the line-end connector includes a first detection pin and a power supply pin, and the display is used to pass The first detection pin sends a detection signal to the main board, the line end connector is provided with a power supply circuit, the first detection pin is connected to the power supply pin through the power supply circuit, and the first end of the first detection pin is used to connect with the board on the main board The second end of the first detection pin is electrically connected to the display, and the first end is connected to the second end through the power supply circuit. When the main board is powered off, the switch is disconnected to cut off the first end and the second end. The electrical connection of the second end prevents the detection signal from being transmitted to the first end through the power supply circuit.

Description

end connector

technical field

The invention relates to an electronic device, in particular to a line end connector.

Background technique

General electronic devices include a number of input and output interfaces for connecting peripherals. Some interfaces, for example, HDMI (High Definition Multimedia Interface, High Definition Multimedia Interface) is a digital video/audio interface technology, which is a dedicated digital interface suitable for image transmission. Interface, which can transmit audio and video signals at the same time. Usually, in a computer, the display is connected to the motherboard through the HDMI interface. After the motherboard is powered off, the HDMI interface will still generate leakage due to the connection with the display. Leakage on the HDMI interface can easily affect the motherboard and cause certain potential safety hazards.

Contents of the invention

In view of the above, it is necessary to provide a wire-end connector that can avoid electric leakage after the mainboard is powered off.

A line-end connector, one end of which is used to be inserted into the board-end connector of the motherboard, and the other end is used to electrically connect with the display, the line-end connector includes a first detection pin and a power supply pin, and the The display is used to send a detection signal to the main board through the first detection pin, the line end connector is provided with a power supply circuit, and the first detection pin is connected to the power supply pin through the power supply circuit, The first end of the first detection pin is used to be electrically connected to the board end connector on the motherboard, the second end of the first detection pin is used to be electrically connected to the display, and the first terminal is connected to the second terminal through the power supply circuit, and when the main board is powered off, the switch is disconnected to cut off the electrical connection between the first terminal and the second terminal, thereby preventing the detection signal from transmitted to the first end through the power supply circuit.

Preferably, the board end connector includes a second detection pin, the first end of the first detection pin is connected to the second detection pin, and the motherboard passes the first detection pin and the The second detection pin receives the detection signal.

Preferably, the power supply circuit further includes a power conversion chip mounted on the connector body, the switch element includes a conducting end, a first connection end and a second connection end, and the power conversion chip includes an input pin and an output pin, the conduction end of the switch is connected to the output pin of the power conversion chip, the first connection end of the switch is connected to the second detection pin of the board connector, and the switch The second connection end of the component is connected to the second end of the first detection pin of the wire end connector, and the input pin of the power conversion chip is connected to the power pin of the wire end connector.

Preferably, the switching element is an N-channel field effect transistor.

Preferably, the conduction terminal, the first connection terminal and the second connection terminal of the switching element respectively correspond to the gate, source and drain of the N-channel field effect transistor.

Preferably, the conduction end of the switch element is also connected to the first connection end of the switch element through a first resistor.

Preferably, the second connection end of the switch element is also grounded through a second resistor.

Preferably, the power supply circuit further includes a power conversion chip installed on the connector body, a management chip is installed on the main board, and the power conversion chip is used to convert the first voltage provided from the main board to is the second voltage, the power supply circuit is used to supply the second voltage to the management chip, and the management chip is used to judge whether the main board is compatible with the main board according to the detection signal after receiving the second voltage Display connection.

Preferably, a management chip is installed on the main board, the management chip is connected to the first end of the first detection pin and the second detection pin, and the management chip is configured according to the The detection signal is used to determine whether the main board is electrically connected to the display.

Preferably, the management chip is a south bridge chip.

Compared with the prior art, in the line-end connector, when the main board is powered off, the switching element is disconnected to cut off the electrical connection between the first end and the second end, thereby preventing the detection The signal is transmitted to the first end through the power supply circuit, thereby preventing the display from leaking electricity to the main board through the detection signal.

Description of drawings

FIG. 1 is a functional block diagram of a preferred embodiment of the cable end connector of the present invention.

FIG. 2 is a circuit connection diagram of a preferred embodiment of the wire end connector of the present invention.

Explanation of main component symbols

end connector 10 Connector body 11 first detection pin 110 first connection pin 112 power pin 114 power supply circuit 12 power conversion chip 13 Board header 20 Second detection pin twenty one Second connection pin twenty three motherboard 30 management chip 40 cable 50 monitor 60

The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings.

Detailed ways

Please refer to Fig. 1 and Fig. 2, in a preferred embodiment of the present invention, the one-line end connector 10 is used for inserting on the board end connector 20 on the motherboard 30, comprises a connector body 11 and is provided with a power supply circuit 12.

The board connector 20 is installed on the motherboard 30 . A management chip 40 connected to the board connector 20 is mounted on the main board 30 . The cable end connector 10 is connected to a display 60 through a cable 50 . The motherboard 30 is used to provide a first voltage of 5V when powered on. In one embodiment, both the cable end connector 10 and the board end connector 20 are HDMI connectors, and the management chip 40 is a south bridge chip.

The power supply circuit 12 includes a power conversion chip 13 installed on the connector body 11 and a switch Q. The connector body 11 is provided with a first detecting pin 110 , a plurality of first connecting pins 112 , and a power pin 114 . The power conversion chip 13 includes an input pin VIN, an output pin VOUT, and a ground pin GND. The switch Q includes a conduction terminal G, a first connection terminal S and a second connection terminal D. As shown in FIG. In one embodiment, the first detection pin 110 is an HPD pin of an HDMI interface, and the power conversion chip 13 is used to convert the first voltage of 5V into a second voltage of 3.3V, and the switch The component Q is an N-channel field effect transistor, and the conduction terminal G, the first connecting terminal S and the second connecting terminal D of the switching component Q correspond to the gate G, source S and drain of the field effect transistor Q respectively. Pole D.

The board connector 20 includes a second detection pin 21 and a plurality of second connection pins 23 . Each second connection pin 23 corresponds to each first connection pin 112 . The management chip 40 judges whether the display 60 is compatible with the motherboard through the first end of the first detection pin 110 of the line connector 10 and the second detection pin 21 of the board connector 20. 30 connections.

The first end of the first detection pin 110 of the connector body 11 is electrically connected to the second detection pin 21, and the second end of the first detection pin 110 of the connector body 11 passes through the cable 50 is connected to the display 60, each second connection pin 23 is electrically connected to each first connection pin 112 respectively, and the input pin VIN of the power conversion chip 13 is connected to the power pin of the connector body 11 114. The output pin VOUT of the power conversion chip 13 is connected to the gate G of the field effect transistor Q, the ground pin GND of the power conversion chip 13 is grounded, and the source S of the field effect transistor Q passes through a The first resistor R1 is connected to the gate G of the field effect transistor Q, the source S of the field effect transistor Q is connected to the second detection pin 21 of the board end connector 20, and the drain of the field effect transistor Q is The pole D is grounded through a second resistor R2 , and the drain D of the field effect transistor Q is connected to the first detection pin 110 of the connector body 11 .

In the above line end connector, when the display 60 is powered on and the main board 30 is turned on, the main board 30 provides the first voltage of 5V, and the power conversion chip 13 converts the first voltage into the The second voltage of 3.3V, the gate G of the field effect transistor Q receives the second voltage, the voltage of the source S of the field effect transistor Q is 0V, and the voltage of the gate G of the field effect transistor Q The voltage 3.3V is greater than the voltage 0V of the source S of the field effect transistor Q, the field effect transistor Q is turned on, the power supply circuit 12 supplies the second voltage to the management chip 40, and the management chip 40 The chip 40 receives an HPD detection signal sent from the display 60 through the line end connector 10 and the board end connector 20, and judges whether the display 60 is connected to the motherboard 30 according to the HPD detection signal. ; When the display 60 is energized and the mainboard 30 is powered off, the mainboard 30 is electrically disconnected from the board end connector 20 and the line end connector 10, and the source of the field effect transistor Q The voltage of S is 0V, the voltage of the gate G of the field effect transistor Q is 0V, the field effect transistor Q is cut off, the power supply circuit 12 does not supply power to the management chip 40, and the management chip 40 cannot receive to the HPD detection signal, so that the HPD detection signal cannot leak to the motherboard 30 through the first detection pin 110 of the line end connector 10 and the second detection pin 21 of the board end connector 20 superior.

In the line end connector, when the main board 30 is powered off, the switch Q is turned off to cut off the connection between the first end of the first detection pin 110 of the connector body 11 and the second end. electrically connected, thereby preventing the HPD detection signal from being transmitted to the first end through the power supply circuit 12 .

The function of the HPD signal is: when the motherboard 30 detects that the display 60 is electrically connected to the motherboard 30 through the HPD pin of the HDMI interface, the graphics display system (graphics card) in the host sends a signal to request The computer reads the EDID data (extended display identification data) stored in the display DDC memory through the display data channel DDC (DDCI2C bus) in the HDMI interface. If it detects that the working mode range of the display is compatible with the graphics card, the host system can activate it. Graphics card TMDS signal sending circuit (digital video signal sending circuit); when the motherboard 30 detects that the display 60 is disconnected from the motherboard 30 through the HPD pin of the HDMI interface, the graphics display system in the host computer sends a signal , inform the operating system of the computer to interrupt the work of the graphics card TMDS signal sending circuit (installed on the graphics card).

For those skilled in the art, other corresponding changes or adjustments can be made according to the inventive solution and the inventive concept of the present invention combined with the actual needs of production, and these changes and adjustments should all belong to the scope of the present invention.

Claims (10)

1. A line end connector, one end of which is used to be plugged into the board end connector of the motherboard, and the other end is used to be electrically connected to the display, the line end connector includes a first detection pin and a power supply pin, The display is used to send a detection signal to the main board through the first detection pin, and it is characterized in that: the line end connector is provided with a power supply circuit, and the first detection pin passes through the power supply circuit and the The power supply pin is connected, the first end of the first detection pin is used to electrically connect with the board end connector on the motherboard, and the second end of the first detection pin is used to connect with the display power connected, the first end is connected to the second end through the power supply circuit, and when the main board is powered off, the switching element is disconnected to cut off the electrical connection between the first end and the second end, Furthermore, the detection signal is prevented from being transmitted to the first end through the power supply circuit. 2. The wire end connector according to claim 1, wherein the board end connector includes a second detection pin, and the first end of the first detection pin is connected to the second detection pin , the motherboard receives the detection signal through the first detection pin and the second detection pin. 3. The wire-end connector according to claim 2, wherein the power supply circuit further includes a power conversion chip mounted on the connector body, and the switch element includes a conducting end, a first connecting end and a second connection end, the power conversion chip includes an input pin and an output pin, the conduction end of the switch element is connected to the output pin of the power conversion chip, and the first connection end of the switch element is connected to the The second detection pin of the board end connector, the second connection end of the switch element is connected to the second end of the first detection pin of the line end connector, and the input pin of the power conversion chip is connected to the The power pins of the wire-end connectors described above. 4. The wire-end connector according to claim 3, wherein the switch element is an N-channel field effect transistor. 5. The wire-end connector according to claim 4, characterized in that: the conducting end, the first connecting end and the second connecting end of the switching element respectively correspond to the gate and source of the N-channel field effect transistor. pole and drain. 6 . The wire end connector according to claim 3 , wherein the conduction end of the switch element is further connected to the first connection end of the switch element through a first resistor. 7. The wire-end connector according to claim 3, wherein the second connection end of the switch element is also grounded through a second resistor. 8. The cable end connector according to claim 1, wherein a management chip is installed on the main board, and the management chip is connected to the first end of the first detection pin and the second detection pin The management chip determines whether the main board is electrically connected to the display according to the detection signal when the switch element is turned on. 9. The cable end connector according to claim 8, wherein the management chip is a south bridge chip. 10. The wire end connector according to claim 1, wherein the power supply circuit further includes a power conversion chip installed on the connector body, a management chip is installed on the main board, and the power conversion The chip is used to convert the first voltage provided by the motherboard into a second voltage, the power supply circuit is used to supply the second voltage to the management chip, and the management chip is used to receive the second voltage. After the voltage is detected, it is determined whether the main board is connected to the display according to the detection signal.