A prompt circuit for graphics card connection

Abstract

The utility model discloses a kind of for the prompt circuit connected to display card, including hot plug detection circuit, opto-isolator circuit, state indicating module and power management module, hot plug detection circuit is electrically connected with opto-isolator circuit, opto-isolator circuit is electrically connected with state indicating module, opto-isolator circuit, hot plug detection circuit and state indicating module are electrically connected with power management module.The utility model detects HPD signal by pure hardware circuit, even if not enter operating system, can immediately feedback connection state, solve traditional software detection delay problem, and can remind personnel by buzzer BZ and LED indicating lamp when display card is connected and not connected, to realize the purpose of intuitive display display card connection state, provide visible real-time feedback for user, facilitate user to know quickly.

Description

Technical Field

[0001] This utility model relates to the field of graphics card connection technology, and in particular to a prompt circuit for graphics card connection. Background Technology

[0002] Currently, the connection status monitoring between graphics cards and display devices is mainly achieved through the operating system (such as Windows Device Manager) or graphics card drivers. However, this method suffers from delays and cannot provide timely feedback when the system is not in operation. In addition, most devices cannot provide real-time feedback visible to the user, and accidental plugging or unplugging can easily lead to signal interruption or device damage, causing the graphics card to be unable to connect to the display device. When the graphics card is not connected, the user cannot quickly know this. In view of the above, this application proposes a prompting circuit for graphics card connection. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies by proposing a prompting circuit for graphics card connection.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A prompting circuit for graphics card connection includes a hot-plug detection circuit, an optocoupler isolation circuit, a status indicator module, and a power management module. The hot-plug detection circuit is electrically connected to the optocoupler isolation circuit, the optocoupler isolation circuit is electrically connected to the status indicator module, and the optocoupler isolation circuit, the hot-plug detection circuit, and the status indicator module are all electrically connected to the power management module.

[0006] The status indication module includes a circuit that drives both an LED and a buzzer, and the power management module includes an LDO voltage regulator circuit.

[0007] Preferably, the hot-swap detection circuit includes a chip U1. Pin 16 of chip U1 is electrically connected to one end of resistor R2, one end of resistor R3, and one end of capacitor C1. Pin 18 of chip U1 is electrically connected to the other end of resistor R2 and the other end of resistor R3. Pin 18 of chip U1 is also electrically connected to one end of resistor R1. The other end of resistor R1 is electrically connected to pin 19 of chip U1. Pin 18 of chip U1 is also electrically connected to one end of resistor R4. The other end of resistor R4 is electrically connected to pin 1 of MOSFET Q1 and pin 3 of MOSFET Q2. Pins 2 of MOSFET Q1 and pin 2 of MOSFET Q2 are both grounded. Pin 1 of MOSFET Q2 is electrically connected to the other end of capacitor C1. Pins 20, 21, 22, and 23 of chip U1 are all grounded.

[0008] Preferably, the LED and buzzer co-drive circuit includes chip U2. Pin 1 of chip U2 is electrically connected to pin 18 of chip U1. Pin 1 of chip U2 is electrically connected to one end of resistor R5. The other end of resistor R5 and pin 2 of chip U2 are both grounded. Pin 3 of chip U2 is electrically connected to one end of resistor R8. Pin 4 of chip U2 is electrically connected to one end of resistor R6. The other end of resistor R6 is electrically connected to pin 3 of MOSFET Q3 and one end of capacitor C2. The other end of capacitor C2 is grounded. Pin 2 of MOSFET Q3 is electrically connected to one end of resistor R7 and the other end of resistor R8. The other end of resistor R7 is grounded. The other end of resistor R7 is also connected to pin 2 of buzzer BZ. Pin 1 of buzzer BZ is electrically connected to pin 1 of MOSFET Q3. Pin 1 of MOSFET Q3 is electrically connected to an indicator LED.

[0009] Preferably, the LDO voltage regulator circuit includes an operational amplifier U3. Pin 1 of the operational amplifier U3 is electrically connected to pin 1 of a transistor Q4. Pin 2 of the transistor Q4 is electrically connected to one end of a capacitor C3. The other end of the capacitor C3 is electrically connected to one end of a resistor R9. Pin 2 of the operational amplifier U3 is electrically connected to one end of a resistor R10 and one end of a resistor R11. The other ends of resistor R10 and resistor R9 are electrically connected to pin 5 of chip U2 and pin 1 of chip U1, respectively. Pin 3 of the operational amplifier U3 is electrically connected to one end of a capacitor C4. The other ends of capacitor C4 and resistor R11 are both grounded.

[0010] Preferably, the optocoupler isolation circuit includes a chip U4. Pins 1 and 2 of chip U4 are electrically connected to the same capacitor C6. One end of capacitor C6 and pin 2 of chip U4 are both grounded. Pin 3 of chip U4 is electrically connected to one end of resistor R12 and one end of capacitor C5. The other end of capacitor C5 is electrically connected to one end of resistor R13. The other end of resistor R13 is electrically connected to the other end of resistor R12. The other end of resistor R12 is also electrically connected to pin 1 of transistor Q5. Pin 1 of transistor Q5 is also electrically connected to the other end of resistor R13. Pin 3 of transistor Q5 and one end of resistor R13 are both grounded. Pin 2 of transistor Q5 is electrically connected to the anode of diode D1. The cathode of diode D1 is electrically connected to pin 1 of chip U2. Pin 1 of chip U4 is electrically connected to a 5V voltage. Pin 4 of chip U4 is electrically connected to the other end of resistor R9.

[0011] Preferably, the chip U1 is an HPD detection chip. Resistors R2, R3 and R4 form a voltage divider network to adjust the HPD signal to a voltage range suitable for comparison by the chip U1. Pin 18 of the chip U1 outputs an HPD high level to indicate that the graphics card is inserted and an HPD low level to indicate that the graphics card is removed. Pin 18 of the chip U1 is connected to an HDMI interface.

[0012] Preferably, the chip U2 is a logic gate chip used to implement logic control, the buzzer BZ is an active buzzer, and the indicator LED is connected in parallel with the buzzer BZ, all controlled by the switching of the MOSFET Q3.

[0013] The resistors R5, R6, and R8 form a feedback loop used to set the trigger threshold of chip U2.

[0014] Compared with existing technologies, the beneficial effects of this utility model are:

[0015] This invention detects HPD signals using pure hardware circuitry, providing immediate feedback on connection status even without accessing the operating system. This solves the latency problem of traditional software detection and alerts users via a buzzer (BZ) and LED indicator when the graphics card is connected or disconnected. This provides a clear and real-time display of the graphics card connection status, allowing users to quickly and easily understand the connection status. Attached Figure Description

[0016] Figure 1 This utility model provides a connection block diagram for a prompting circuit for connecting a graphics card.

[0017] Figure 2 The present invention provides a circuit diagram of a hot-plug detection circuit in a graphics card connection prompt circuit.

[0018] Figure 3 The present invention provides a circuit diagram of an LED and buzzer co-drive circuit in a graphics card connection prompt circuit.

[0019] Figure 4 The present invention provides a circuit diagram of an LDO voltage regulator circuit in a prompt circuit for graphics card connection.

[0020] Figure 5 This invention provides a circuit diagram of an optocoupler isolation circuit in a graphics card connection prompt circuit. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] Reference Figure 1-5 A prompting circuit for graphics card connection includes a hot-plug detection circuit, an optocoupler isolation circuit, a status indicator module, and a power management module. The hot-plug detection circuit is electrically connected to the optocoupler isolation circuit, the optocoupler isolation circuit is electrically connected to the status indicator module, and the optocoupler isolation circuit, the hot-plug detection circuit, and the status indicator module are all electrically connected to the power management module.

[0023] The status indicator module includes LED and buzzer co-drive circuits, and the power management module includes LDO voltage regulator circuits;

[0024] The hot-swap detection circuit includes a chip U1. Pin 16 of chip U1 is electrically connected to one end of resistor R2, one end of resistor R3, and one end of capacitor C1. Pin 18 of chip U1 is electrically connected to the other end of resistor R2 and the other end of resistor R3. Pin 18 of chip U1 is also electrically connected to one end of resistor R1. The other end of resistor R1 is electrically connected to pin 19 of chip U1. Pin 18 of chip U1 is also electrically connected to one end of resistor R4. The other end of resistor R4 is electrically connected to pin 1 of MOSFET Q1 and pin 3 of MOSFET Q2. Pins 2 of MOSFET Q1 and pin 2 of MOSFET Q2 are both grounded. Pin 1 of MOSFET Q2 is electrically connected to the other end of capacitor C1. Pins 20, 21, 22, and 23 of chip U1 are all grounded.

[0025] Chip U1 is an HPD detection chip. Resistors R2, R3, and R4 form a voltage divider network to adjust the HPD signal to a voltage range suitable for comparison by chip U1. Pin 18 of chip U1 outputs an HPD high level to indicate that the graphics card is inserted and an HPD low level to indicate that the graphics card is removed. Pin 18 of chip U1 is connected to the HDMI interface.

[0026] The LED and buzzer co-drive circuit includes chip U2. Pin 1 of chip U2 is electrically connected to pin 18 of chip U1. Pin 1 of chip U2 is electrically connected to one end of resistor R5. The other end of resistor R5 and pin 2 of chip U2 are both grounded. Pin 3 of chip U2 is electrically connected to one end of resistor R8. Pin 4 of chip U2 is electrically connected to one end of resistor R6. The other end of resistor R6 is electrically connected to pin 3 of MOSFET Q3 and one end of capacitor C2. The other end of capacitor C2 is grounded. Pin 2 of MOSFET Q3 is electrically connected to one end of resistor R7 and... The other end of resistor R8 and the other end of resistor R7 are grounded. The other end of resistor R7 is also connected to pin 2 of buzzer BZ. Pin 1 of buzzer BZ is electrically connected to pin 1 of MOSFET Q3. Pin 1 of MOSFET Q3 is electrically connected to indicator LED. Chip U2 is a logic gate chip used to implement logic control. Buzzer BZ is an active buzzer. Indicator LED is connected in parallel with buzzer BZ and is controlled by the switch of MOSFET Q3. Resistors R5, R6, and R8 form a feedback loop used to set the trigger threshold of chip U2.

[0027] The LDO voltage regulator circuit includes an operational amplifier U3. Pin 1 of the operational amplifier U3 is electrically connected to pin 1 of the transistor Q4. Pin 2 of the transistor Q4 is electrically connected to one end of the capacitor C3. The other end of the capacitor C3 is electrically connected to one end of the resistor R9. Pin 2 of the operational amplifier U3 is electrically connected to one end of the resistor R10 and one end of the resistor R11. The other ends of the resistor R10 and the other ends of the resistor R9 are electrically connected to pin 5 of the chip U2 and pin 1 of the chip U1, respectively. Pin 3 of the operational amplifier U3 is electrically connected to one end of the capacitor C4. The other ends of the capacitor C4 and the other ends of the resistor R11 are both grounded.

[0028] Resistors R10 and R11 form a voltage divider network. Operational amplifier U3 is used as an error amplifier. A closed-loop feedback system is formed through transistor Q4 and the resistor voltage divider network. Operational amplifier U3 dynamically controls the conduction of transistor Q4 by comparing the potential difference between pin 2 and pin 3, so that the output voltage is stabilized at the set value. Capacitors C3 and C4 are used to filter and suppress high-frequency noise. Resistor R9 is used as a load current sensing resistor. It works with resistors R10 and R11 to set the output voltage accuracy, and finally provides a clean and stable operating voltage for chips U1 and U2.

[0029] The optocoupler isolation circuit includes chip U4. Pins 1 and 2 of chip U4 are electrically connected to the same capacitor C6. One end of capacitor C6 and pin 2 of chip U4 are both grounded. Pin 3 of chip U4 is electrically connected to one end of resistor R12 and one end of capacitor C5. The other end of capacitor C5 is electrically connected to one end of resistor R13. The other end of resistor R13 is electrically connected to the other end of resistor R12. The other end of resistor R12 is also electrically connected to pin 1 of transistor Q5. Pin 1 of transistor Q5 is also electrically connected to the other end of resistor R13. Pin 3 of transistor Q5 and one end of resistor R13 are both grounded. Pin 2 of transistor Q5 is electrically connected to the anode of diode D1. The cathode of diode D1 is electrically connected to pin 1 of chip U2. Pin 1 of chip U4 is electrically connected to a 5V voltage. Pin 4 of chip U4 is electrically connected to the other end of resistor R9.

[0030] Electrical isolation of input / output signals is achieved through chip U4. When a 5V input signal is applied to pin 1 of chip U1, the internal LED illuminates, turning on the phototransistor. The output signal is then controlled by a drive circuit composed of resistor R12, capacitor C5, and transistor Q5. Capacitors C5 and C6 filter out high-frequency interference, transistor Q5 enhances the driving capability, and diode D1 provides reverse protection. Finally, the isolated signal is output to the subsequent circuit through pin 4 of chip U4, effectively blocking ground loop interference and protecting low-voltage side devices.

[0031] This invention detects HPD signals using pure hardware circuitry, providing immediate feedback on connection status even without accessing the operating system. This solves the latency problem of traditional software detection and alerts users via a buzzer (BZ) and LED indicator when the graphics card is connected or disconnected. This provides a clear and real-time display of the graphics card connection status, allowing users to quickly and easily understand the connection status.

[0032] Working principle: When the graphics card is connected to the monitor, pin 18 of chip U1, which connects to the HDMI interface, is pulled high. Chip U1 adjusts the HPD signal level through a voltage divider network composed of resistors R2, R3, and R4, and compares the signals. When the graphics card is inserted, HPD is high, and pin 18 of chip U1 outputs a high-level signal. When the graphics card is removed, HPD is low, and pin 18 of chip U1 outputs a low-level signal. When the HPD signal changes, chip U4 transmits the signal to the status indicator module. Chip U2 receives the signal after optocoupler isolation and controls the switch of MOSFET Q3. When the graphics card is inserted, U2 outputs a high level, MOSFET Q3 is turned on, the LED lights up (green), and the buzzer BZ beeps briefly to indicate a successful connection. When the graphics card is removed, chip U2 outputs a low level, MOSFET Q3 is turned off, the LED lights up (red), and the buzzer BZ stops beeping.

[0033] Furthermore, during the monitoring process, a stable voltage is provided through operational amplifier U3 and transistor Q4, ensuring the normal operation of each module and circuit.

[0034] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A prompting circuit for graphics card connection, characterized in that, It includes a hot-plug detection circuit, an optocoupler isolation circuit, a status indicator module, and a power management module. The hot-plug detection circuit is electrically connected to the optocoupler isolation circuit, the optocoupler isolation circuit is electrically connected to the status indicator module, and the optocoupler isolation circuit, the hot-plug detection circuit, and the status indicator module are all electrically connected to the power management module. The status indication module includes a circuit that drives both an LED and a buzzer, and the power management module includes an LDO voltage regulator circuit.

2. The prompting circuit for graphics card connection according to claim 1, characterized in that, The hot-swap detection circuit includes a chip U1. Pin 16 of chip U1 is electrically connected to one end of resistor R2, one end of resistor R3, and one end of capacitor C1. Pin 18 of chip U1 is electrically connected to the other end of resistor R2 and the other end of resistor R3. Pin 18 of chip U1 is also electrically connected to one end of resistor R1. The other end of resistor R1 is electrically connected to pin 19 of chip U1. Pin 18 of chip U1 is also electrically connected to one end of resistor R4. The other end of resistor R4 is electrically connected to pin 1 of MOSFET Q1 and pin 3 of MOSFET Q2. Pins 2 of MOSFET Q1 and pin 2 of MOSFET Q2 are both grounded. Pin 1 of MOSFET Q2 is electrically connected to the other end of capacitor C1. Pins 20, 21, 22, and 23 of chip U1 are all grounded.

3. The prompting circuit for graphics card connection according to claim 2, characterized in that, The LED and buzzer co-drive circuit includes chip U2. Pin 1 of chip U2 is electrically connected to pin 18 of chip U1. Pin 1 of chip U2 is electrically connected to one end of resistor R5. The other end of resistor R5 and pin 2 of chip U2 are both grounded. Pin 3 of chip U2 is electrically connected to one end of resistor R8. Pin 4 of chip U2 is electrically connected to one end of resistor R6. The other end of resistor R6 is electrically connected to pin 3 of MOSFET Q3 and one end of capacitor C2. The other end of capacitor C2 is grounded. Pin 2 of MOSFET Q3 is electrically connected to one end of resistor R7 and the other end of resistor R8. The other end of resistor R7 is grounded. The other end of resistor R7 is also connected to pin 2 of buzzer BZ. Pin 1 of buzzer BZ is electrically connected to pin 1 of MOSFET Q3. Pin 1 of MOSFET Q3 is electrically connected to an indicator LED.

4. The prompting circuit for graphics card connection according to claim 3, characterized in that, The LDO voltage regulator circuit includes an operational amplifier U3. Pin 1 of the operational amplifier U3 is electrically connected to pin 1 of the transistor Q4. Pin 2 of the transistor Q4 is electrically connected to one end of the capacitor C3. The other end of the capacitor C3 is electrically connected to one end of the resistor R9. Pin 2 of the operational amplifier U3 is electrically connected to one end of the resistor R10 and one end of the resistor R11. The other ends of the resistor R10 and the other ends of the resistor R9 are electrically connected to pin 5 of the chip U2 and pin 1 of the chip U1, respectively. Pin 3 of the operational amplifier U3 is electrically connected to one end of the capacitor C4. The other ends of the capacitor C4 and the other ends of the resistor R11 are both grounded.

5. The prompting circuit for graphics card connection according to claim 4, characterized in that, The optocoupler isolation circuit includes a chip U4. Pins 1 and 2 of chip U4 are electrically connected to the same capacitor C6. One end of capacitor C6 and pin 2 of chip U4 are both grounded. Pin 3 of chip U4 is electrically connected to one end of resistor R12 and one end of capacitor C5. The other end of capacitor C5 is electrically connected to one end of resistor R13. The other end of resistor R13 is electrically connected to the other end of resistor R12. The other end of resistor R12 is also electrically connected to pin 1 of transistor Q5. Pin 1 of transistor Q5 is also electrically connected to the other end of resistor R13. Pin 3 of transistor Q5 and one end of resistor R13 are both grounded. Pin 2 of transistor Q5 is electrically connected to the anode of diode D1. The cathode of diode D1 is electrically connected to pin 1 of chip U2. Pin 1 of chip U4 is electrically connected to a 5V voltage. Pin 4 of chip U4 is electrically connected to the other end of resistor R9.

6. The prompting circuit for graphics card connection according to claim 2, characterized in that, The chip U1 is an HPD detection chip. Resistors R2, R3, and R4 form a voltage divider network to adjust the HPD signal to a voltage range suitable for comparison by the chip U1. Pin 18 of the chip U1 outputs an HPD high level, indicating that the graphics card is inserted, and outputs an HPD low level, indicating that the graphics card is removed. Pin 18 of the chip U1 is connected to the HDMI interface.

7. The prompting circuit for graphics card connection according to claim 3, characterized in that, The chip U2 is a logic gate chip used to implement logic control. The buzzer BZ is an active buzzer. The indicator LED is connected in parallel with the buzzer BZ and is controlled by the switching of the MOSFET Q3. The resistors R5, R6, and R8 form a feedback loop used to set the trigger threshold of chip U2.

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