Display card external power supply leakage alarm circuit

Abstract

The utility model relates to a display card external power supply leakage alarm circuit, which comprises a master control MCU, a detection circuit and an alarm circuit, the detection circuit is connected between the master control MCU and a display card external power supply, the alarm circuit is connected with the master control MCU, a field effect transistor Q10856A and a field effect transistor Q10856B are arranged in the detection circuit, the field effect transistor Q10856A is connected with the alarm circuit, and the field effect transistor Q10856B is connected with the alarm circuit. The field effect transistor Q10856A is connected with the display card external power supply, the field effect transistor Q10856B is connected with the field effect transistor Q10856A, and the field effect transistor Q10856B is connected with the main control MCU. Through the circuit of the scheme, when the external power supply of the display card is not connected, an alarm sound can be given out in time, so that the troubleshooting time and energy are reduced, and the later maintenance is more convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of graphics card detection, in particular to a graphics card external power supply leakage alarm circuit. Background Art

[0002] When installing the computer, the power cord of the graphics card needs to be connected to an external power supply to provide power to the graphics card. If the external power supply is not connected, the graphics card cannot operate normally, which affects the computer startup. In the prior art, there is no alarm measure for the situation of missing the power cord, which will affect the judgment of the maintenance personnel, resulting in a long maintenance time and inconvenience. Summary of the invention

[0003] The utility model provides a graphics card external power supply missing alarm circuit, aiming to solve the problem that the prior art lacks an alarm prompt for external power supply missing, causing inconvenience in maintenance.

[0004] The utility model provides a graphics card external power supply leakage alarm circuit, comprising a main control MCU, a detection circuit and an alarm circuit, wherein the detection circuit is connected between the main control MCU and the graphics card external power supply, the alarm circuit is connected to the main control MCU, a field effect tube Q10856A and a field effect tube Q10856B are arranged in the detection circuit, the field effect tube Q10856A is connected to the graphics card external power supply, the field effect tube Q10856B is connected to the field effect tube Q10856A, and the field effect tube Q10856B is connected to the main control MCU.

[0005] As a further improvement of the utility model, the gate of the field effect tube Q10856A is connected to the detection port of the external power supply of the graphics card, the source of the field effect tube Q10856A is grounded, the drain of the field effect tube Q10856A is connected to the gate of the field effect tube Q10856B, the source of the field effect tube Q10856B is grounded, and the drain of the field effect tube Q10856B is connected to the PA4 port of the main control MCU.

[0006] As a further improvement of the present invention, the detection circuit further includes a resistor R91291, one end of the resistor R91291 is connected to the drain of the field effect transistor Q10856A, and the other end of the resistor R91291 is connected to a 5V voltage.

[0007] As a further improvement of the utility model, the alarm circuit includes a buzzer BS2, a transistor Q10866A and a resistor R91292, one end of the resistor R91292 is connected to the PA5 port of the main control MCU, the other end of the resistor R91292 is connected to the base of the transistor Q10866A, the collector of the transistor Q10866A is connected to pin 2 of the buzzer BS2, the emitter of the transistor Q10866A is grounded, and pin 1 of the buzzer BS2 is connected to a 5V voltage.

[0008] As a further improvement of the utility model, the alarm circuit also includes a capacitor C92065, a capacitor C92066 and a diode D522, one end of the capacitor C92066 is connected to pin 1 of the buzzer BS2, the other end of the capacitor C92066 is grounded, the cathode of the diode D522 is connected to pin 1 of the buzzer BS2, the anode of the diode D522 is connected to pin 2 of the buzzer BS2, one end of the capacitor C92065 is connected to pin 1 of the buzzer BS2, and the other end of the capacitor C92065 is connected to pin 2 of the buzzer BS2.

[0009] As a further improvement of the present invention, the alarm circuit further includes a capacitor C92067, one end of the capacitor C92067 is connected to the base of the transistor Q10866A, and the other end of the capacitor C92067 is grounded.

[0010] As a further improvement of the present invention, the alarm circuit further includes a resistor R91293, one end of the resistor R91293 is connected to the other end of the resistor R91292, and the other end of the resistor R91293 is grounded.

[0011] The beneficial effect of the utility model is that through the circuit of the solution, when the external power supply of the graphics card is disconnected, an alarm sound can be issued in time, which reduces the time and energy of troubleshooting and makes subsequent maintenance more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a connection relationship diagram between the modules of the utility model;

[0013] Figure 2 This is a pin diagram of the main control MCU of the utility model;

[0014] Figure 3 It is a circuit connection diagram of the detection circuit of the utility model;

[0015] Figure 4 It is a circuit connection diagram of the alarm circuit of the utility model. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0017] like Figure 1-4 As shown, the utility model provides an alarm circuit for leakage of external power supply of graphics card, including a main control MCU, a detection circuit and an alarm circuit, the detection circuit is connected between the main control MCU and the external power supply of graphics card, the alarm circuit is connected to the main control MCU, the detection circuit is provided with a field effect tube Q10856A and a field effect tube Q10856B, the field effect tube Q10856A is connected to the external power supply of graphics card, the field effect tube Q10856B is connected to the field effect tube Q10856A, and the field effect tube Q10856B is connected to the main control MCU.

[0018] As an embodiment of the utility model, the gate of the field effect tube Q10856A is connected to the detection port of the external power supply of the graphics card, the source of the field effect tube Q10856A is grounded, the drain of the field effect tube Q10856A is connected to the gate of the field effect tube Q10856B, the source of the field effect tube Q10856B is grounded, and the drain of the field effect tube Q10856B is connected to the PA4 port of the main control MCU.

[0019] As another embodiment of the present invention, the detection circuit further includes a resistor R91291, one end of the resistor R91291 is connected to the drain of the field effect transistor Q10856A, and the other end of the resistor R91291 is connected to a 5V voltage.

[0020] As another embodiment of the utility model, the alarm circuit includes a buzzer BS2, a transistor Q10866A and a resistor R91292, one end of the resistor R91292 is connected to the PA5 port of the main control MCU, the other end of the resistor R91292 is connected to the base of the transistor Q10866A, the collector of the transistor Q10866A is connected to pin 2 of the buzzer BS2, the emitter of the transistor Q10866A is grounded, and pin 1 of the buzzer BS2 is connected to a 5V voltage.

[0021] As another embodiment of the utility model, the alarm circuit also includes a capacitor C92065, a capacitor C92066 and a diode D522, one end of the capacitor C92066 is connected to pin 1 of the buzzer BS2, the other end of the capacitor C92066 is grounded, the cathode of the diode D522 is connected to pin 1 of the buzzer BS2, the anode of the diode D522 is connected to pin 2 of the buzzer BS2, one end of the capacitor C92065 is connected to pin 1 of the buzzer BS2, and the other end of the capacitor C92065 is connected to pin 2 of the buzzer BS2.

[0022] As another embodiment of the present utility model, the alarm circuit further includes a capacitor C92067, one end of the capacitor C92067 is connected to the base of the transistor Q10866A, and the other end of the capacitor C92067 is grounded.

[0023] As another embodiment of the present utility model, the alarm circuit further includes a resistor R91293, one end of the resistor R91293 is connected to the other end of the resistor R91292, and the other end of the resistor R91293 is grounded.

[0024] The utility model provides a graphics card external power supply leakage alarm circuit, the graphics card external power supply signal is given to the detection circuit, there will be level recognition, and then the signal is given to the main control MCU, the main control MCU sends a PWM signal to the alarm circuit, and sends an alarm sound to prompt the user.

[0025] The circuit works as follows:

[0026] In the detection circuit, INPUT_PEX6_8_DT1* is a detection signal of the external power supply of the graphics card. When the external power supply of the graphics card is not connected, the INPUT_PEX6_8_DT1* signal is high. At this time, because INPUT_PEX6_8_DT1* is high, the field effect tube Q10865A is turned on and the 5V voltage is pulled down, causing the gate of the field effect tube Q10865B to be low, and the field effect tube Q10865B cannot be turned on. At this time, the PA4 port of the main control MCU is in the internal high-level mode. When the PA4 port is high, the main control MCU will output a PWM signal through the PA5 port. When the PA5 port has a high-level PWM signal output, the NPN three-stage tube Q10866A will be turned on, and the buzzer BS2 will make a sound;

[0027] When the graphics card is connected to an external power supply, INPUT_PEX6_8_DT1* is at a low level. At this time, because INPUT_PEX6_8_DT1* is low, the field effect tube Q10865A is not turned on. At this time, the field effect tube Q10865B is turned on because the gate is 5V. The field effect tube Q10865B is turned on and the PA4 port is pulled down. Because the PA4 port is at a low level, the PA5 port is also at a low level. Then the transistor Q10866A is not turned on, so the buzzer BS2 does not make a sound.

[0028] In the alarm circuit, the NPN transistor Q10866A controls the passive buzzer design drive circuit. The resistor R91292 is a current limiting resistor to prevent the base current flowing through the transistor Q10866A from being too large and damaging the transistor.

[0029] The resistor R91293 has important functions. The first function is that the resistor R91293 is equivalent to the pull-down resistor of the base. If the input end is left unconnected, the transistor can be kept in a reliable off state due to the existence of the resistor R91293. If the resistor R91293 is removed, when the input end of the PA5 port is left unconnected, it is susceptible to interference and may cause the transistor state to accidentally flip or enter an unexpected amplification state, causing the buzzer BS2 to sound unexpectedly. The second function is that the resistor R91293 can increase the high-level threshold voltage. If the resistor R91293 is removed, the high-level threshold voltage of the transistor Q10866A is only 0.7V, that is, the PA5 port input voltage can be turned on as long as it exceeds 0.7V. After adding the resistor R91293, the transistor Q10866A will be saturated and turned on when the input voltage from the PA5 port reaches about 2.2V.

[0030] Capacitor C92065 can eliminate the EMI radiation of the buzzer BS2. Capacitor C92066 is a power filter capacitor to filter out high-frequency noise of the power supply. Capacitor C92067 can effectively filter out interference signals in a strong interference environment to prevent the buzzer from changing its tone and making unexpected sounds. Diode D522 provides freewheeling, otherwise there will be a reverse induced electromotive force at both ends of the buzzer, generating a peak voltage of tens of volts, which may damage the transistor Q10866A and interfere with other parts of the entire circuit system.

[0031] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A graphics card external power supply missing alarm circuit, characterized in that: It includes a main control MCU, a detection circuit and an alarm circuit. The detection circuit is connected between the main control MCU and an external power supply of a graphics card. The alarm circuit is connected to the main control MCU. A field effect transistor Q10856A and a field effect transistor Q10856B are provided in the detection circuit. The field effect transistor Q10856A is connected to the external power supply of the graphics card. The field effect transistor Q10856B is connected to the field effect transistor Q10856A. The field effect transistor Q10856B is connected to the main control MCU.

2. A graphics card external power supply missing alarm circuit according to claim 1, characterized in that: The gate of the field effect tube Q10856A is connected to the detection port of the external power supply of the graphics card, the source of the field effect tube Q10856A is grounded, the drain of the field effect tube Q10856A is connected to the gate of the field effect tube Q10856B, the source of the field effect tube Q10856B is grounded, and the drain of the field effect tube Q10856B is connected to the PA4 port of the main control MCU.

3. A graphics card external power supply missing alarm circuit according to claim 1, characterized in that: The detection circuit further includes a resistor R91291, one end of the resistor R91291 is connected to the drain of the field effect transistor Q10856A, and the other end of the resistor R91291 is connected to a 5V voltage.

4. A graphics card external power supply missing alarm circuit according to claim 1, characterized in that: The alarm circuit includes a buzzer BS2, a transistor Q10866A and a resistor R91292, one end of the resistor R91292 is connected to the PA5 port of the main control MCU, the other end of the resistor R91292 is connected to the base of the transistor Q10866A, the collector of the transistor Q10866A is connected to pin 2 of the buzzer BS2, the emitter of the transistor Q10866A is grounded, and pin 1 of the buzzer BS2 is connected to a 5V voltage.

5. A graphics card external power supply missing alarm circuit according to claim 4, characterized in that: The alarm circuit also includes capacitor C92065, capacitor C92066 and diode D522, one end of the capacitor C92066 is connected to pin 1 of the buzzer BS2, the other end of the capacitor C92066 is grounded, the cathode of the diode D522 is connected to pin 1 of the buzzer BS2, the anode of the diode D522 is connected to pin 2 of the buzzer BS2, one end of the capacitor C92065 is connected to pin 1 of the buzzer BS2, and the other end of the capacitor C92065 is connected to pin 2 of the buzzer BS2.

6. A graphics card external power supply missing alarm circuit according to claim 4, characterized in that: The alarm circuit further includes a capacitor C92067, one end of which is connected to the base of the transistor Q10866A, and the other end of which is grounded.

7. A graphics card external power supply missing alarm circuit according to claim 4, characterized in that: The alarm circuit further includes a resistor R91293, one end of the resistor R91293 is connected to the other end of the resistor R91292, and the other end of the resistor R91293 is grounded.

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