Graphics card over-high temperature alarm circuit

Abstract

The utility model relates to a graphics card overtemperature alarm circuit, including master control MCU, temperature detection circuit and temperature alarm circuit, the temperature detection circuit is connected between the master control MCU and graphics card, the temperature alarm circuit is connected with the master control MCU, the temperature detection circuit is provided with a field effect transistor Q10856A and a field effect transistor Q10856B, the field effect transistor Q10856A is connected with the master control MCU, the field effect transistor Q10856B is connected with the master control MCU, and the field effect transistor Q10856B is connected with the master control MCU. The field effect transistor Q10856A is connected with an I2CSSCL interface of the display card, and the field effect transistor Q10856B is connected with an I2CSSDA interface of the display card. Through the circuit of the scheme, when the temperature of the display card is too high, an alarm can be given in time, a user can be notified to turn off a power supply for cooling treatment in advance, a heat dissipation system is checked, dust in heat dissipation fins is cleaned, heat dissipation silicone grease on a chip of the display card is replaced, and unnecessary loss is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of temperature monitoring of graphics cards, in particular to an alarm circuit for excessively high temperature of a graphics card. Background Art

[0002] The normal temperature range of the graphics card GPU is between 30℃~85℃ (degrees Celsius). If the user's operating environment is too dusty or the silicone grease is dry or ineffective, the thermal conductivity will be reduced, which will lead to poor heat dissipation of the graphics card. The graphics card operating temperature will exceed the reasonable temperature range, and the frequency and power consumption will be reduced, resulting in a poor user experience. Therefore, a high-temperature alarm circuit needs to be designed to remind the user that the graphics card has encountered abnormal high temperature and needs to be cleaned or returned to the factory to replace the silicone grease. Summary of the Invention

[0003] The utility model provides a graphics card over-temperature alarm circuit, aiming to solve the problem in the prior art that when the graphics card temperature is too high, there is a lack of prompt alarm measures.

[0004] The utility model provides a graphics card overtemperature alarm circuit, comprising a main control MCU, a temperature detection circuit and a temperature alarm circuit, wherein the temperature detection circuit is connected between the main control MCU and the graphics card, the temperature alarm circuit is connected to the main control MCU, and a field effect transistor Q10856A and a field effect transistor Q10856B are provided in the temperature detection circuit, the field effect transistor Q10856A is connected to the I2CS_SCL interface of the graphics card, and the field effect transistor Q10856B is connected to the I2CS_SDA interface of the graphics card.

[0005] As a further improvement of the present invention, the temperature detection circuit also includes a resistor R100, one end of the resistor R100 is connected to the I2CS_SCL interface of the graphics card, the other end of the resistor R100 is connected to the drain of the field effect transistor Q10856A, the source of the field effect transistor Q10856A is connected to pin 7 of the main control MCU, and the gate of the field effect transistor Q10856A is connected to a 1.8V voltage.

[0006] As a further improvement of the present invention, the temperature detection circuit also includes a resistor R97, one end of the resistor R97 is connected to the I2CS_SDA interface of the graphics card, the other end of the resistor R97 is connected to the drain of the field effect transistor Q10856B, the source of the field effect transistor Q10856B is connected to pin 6 of the main control MCU, and the gate of the field effect transistor Q10856B is connected to a 1.8V voltage.

[0007] As a further improvement of the present invention, the temperature detection circuit also includes a resistor R629 and a resistor R632, one end of the resistor R629 is connected to the I2CS_SCL interface of the graphics card, one end of the resistor R632 is connected to the I2CS_SDA interface of the graphics card, and the other end of the resistor R629 is connected to the other end of the resistor R632 and is connected to a 1.8V voltage.

[0008] As a further improvement of the present invention, the temperature detection circuit also includes a resistor R91237 and a resistor R91238, one end of the resistor R91237 is connected to pin 7 of the main control MCU, one end of the resistor R91238 is connected to pin 6 of the main control MCU, and the other end of the resistor R91237 is connected to the other end of the resistor R91238 and is connected to a 5V voltage.

[0009] As a further improvement of the present invention, the temperature alarm circuit includes a buzzer BS1, a transistor Q10857 and a resistor R91243, one end of the resistor R91243 is connected to pin 17 of the main control MCU, the other end of the resistor R91243 is connected to the base of the transistor Q10857, the collector of the transistor Q10857 is connected to pin 2 of the buzzer BS1, the emitter of the transistor Q10857 is grounded, and pin 1 of the buzzer BS1 is connected to a 5V voltage.

[0010] As a further improvement of the present invention, the temperature alarm circuit also includes a capacitor C92048, a capacitor C92049 and a diode D1, one end of the capacitor C92049 is connected to pin 1 of the buzzer BS1, the other end of the capacitor C92049 is grounded, the cathode of the diode D1 is connected to pin 1 of the buzzer BS1, the anode of the diode D1 is connected to pin 2 of the buzzer BS1, one end of the capacitor C92048 is connected to pin 1 of the buzzer BS1, and the other end of the capacitor C92048 is connected to pin 2 of the buzzer BS1.

[0011] As a further improvement of the present invention, the temperature alarm circuit further includes a capacitor C92047, one end of the capacitor C92047 is connected to the base of the transistor Q10857, and the other end of the capacitor C92047 is grounded.

[0012] As a further improvement of the present invention, the temperature alarm circuit further includes a resistor R91242, one end of the resistor R91242 is connected to the other end of the resistor R91243, and the other end of the resistor R91242 is grounded.

[0013] The beneficial effect of the present invention is that, through the circuit of the present solution, an alarm can be issued in time when the temperature of the graphics card is too high, and the user can be notified in advance to turn off the power supply for cooling, check the cooling system, clean the dust in the cooling fins, and replace the cooling silicone grease on the graphics card chip, thereby reducing unnecessary losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a connection relationship diagram between the modules of the utility model;

[0015] Figure 2 This is the circuit connection diagram of the main control MCU of the utility model;

[0016] Figure 3 This is a circuit connection diagram of the temperature detection circuit of the utility model;

[0017] Figure 4 It is a circuit connection diagram of the temperature alarm circuit of the utility model. DETAILED DESCRIPTION

[0018] 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 with reference to the accompanying drawings and embodiments. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to directions in the accompanying drawings, and the terms "bottom," "top," "inner," and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0019] like Figure 1-4 As shown, the utility model provides a graphics card overtemperature alarm circuit, including a main control MCU, a temperature detection circuit and a temperature alarm circuit, the temperature detection circuit is connected between the main control MCU and the graphics card, the temperature alarm circuit is connected to the main control MCU, and the temperature detection circuit is provided with a field effect transistor Q10856A and a field effect transistor Q10856B, the field effect transistor Q10856A is connected to the I2CS_SCL interface of the graphics card, and the field effect transistor Q10856B is connected to the I2CS_SDA interface of the graphics card.

[0020] As an embodiment of the present utility model, the temperature detection circuit also includes a resistor R100, one end of the resistor R100 is connected to the I2CS_SCL interface of the graphics card, the other end of the resistor R100 is connected to the drain of the field effect transistor Q10856A, the source of the field effect transistor Q10856A is connected to pin 7 of the main control MCU, and the gate of the field effect transistor Q10856A is connected to a 1.8V voltage.

[0021] As another embodiment of the present invention, the temperature detection circuit also includes a resistor R97, one end of the resistor R97 is connected to the I2CS_SDA interface of the graphics card, the other end of the resistor R97 is connected to the drain of the field effect transistor Q10856B, the source of the field effect transistor Q10856B is connected to pin 6 of the main control MCU, and the gate of the field effect transistor Q10856B is connected to a 1.8V voltage.

[0022] As another embodiment of the present invention, the temperature detection circuit also includes a resistor R629 and a resistor R632, one end of the resistor R629 is connected to the I2CS_SCL interface of the graphics card, one end of the resistor R632 is connected to the I2CS_SDA interface of the graphics card, and the other end of the resistor R629 is connected to the other end of the resistor R632 and is connected to a 1.8V voltage.

[0023] As another embodiment of the present invention, the temperature detection circuit also includes a resistor R91237 and a resistor R91238, one end of the resistor R91237 is connected to pin 7 of the main control MCU, one end of the resistor R91238 is connected to pin 6 of the main control MCU, and the other end of the resistor R91237 is connected to the other end of the resistor R91238 and is connected to a 5V voltage.

[0024] As another embodiment of the present utility model, the temperature alarm circuit includes a buzzer BS1, a transistor Q10857 and a resistor R91243, one end of the resistor R91243 is connected to pin 17 of the main control MCU, the other end of the resistor R91243 is connected to the base of the transistor Q10857, the collector of the transistor Q10857 is connected to pin 2 of the buzzer BS1, the emitter of the transistor Q10857 is grounded, and pin 1 of the buzzer BS1 is connected to a 5V voltage.

[0025] As another embodiment of the present invention, the temperature alarm circuit also includes a capacitor C92048, a capacitor C92049 and a diode D1, one end of the capacitor C92049 is connected to pin 1 of the buzzer BS1, the other end of the capacitor C92049 is grounded, the cathode of the diode D1 is connected to pin 1 of the buzzer BS1, the anode of the diode D1 is connected to pin 2 of the buzzer BS1, one end of the capacitor C92048 is connected to pin 1 of the buzzer BS1, and the other end of the capacitor C92048 is connected to pin 2 of the buzzer BS1.

[0026] As another embodiment of the present invention, the temperature alarm circuit further includes a capacitor C92047, one end of the capacitor C92047 is connected to the base of the transistor Q10857, and the other end of the capacitor C92047 is grounded.

[0027] As another embodiment of the present invention, the temperature alarm circuit further includes a resistor R91242, one end of the resistor R91242 is connected to the other end of the resistor R91243, and the other end of the resistor R91242 is grounded.

[0028] The utility model provides a graphics card overtemperature alarm circuit. The signal of the graphics card is given to a detection device. The detection device uses a thermocouple, that is, a thermal sensor, which is integrated in the wafer inside the GPU chip to detect the temperature at different positions. The temperatures at different positions are transmitted to the GPU. The temperature detection circuit reads the temperature inside the graphics card GPU through SMBUS communication. The read temperature data is transmitted to the main control MCU through an I2CS signal. After receiving the instruction, the main control MCU sends a PWM signal to the temperature alarm circuit.

[0029] The circuit works as follows:

[0030] When the graphics card detection signal identifies that the temperature is too high, it communicates with the main control MCU through the I2CS_SCL interface and the I2CS_SDA interface. The field effect transistor Q10856A and the field effect transistor Q10856B are interface protection ICs. The gate of the field effect transistor Q10856A or the gate of the field effect transistor Q10856B is at a high level. At this time, the field effect transistor Q10856A and the field effect transistor Q10856B will be turned on and send a signal to pin 6 or pin 7 of the main control MCU to realize data transmission and notify the main control MCU.

[0031] Upon receiving the high-temperature signal, the master MCU outputs a PWM signal through pin 17 of the master MCU, port PA5. When the graphics card's temperature is normal, port PA5 outputs a low level, and the signal from resistor R91243 is low, disabling transistor Q10857. When the graphics card's temperature is abnormal, port PA5 outputs a high level, and the signal from resistor R91243 is high, turning transistor Q10857 on.

[0032] When the transistor Q10857 is turned on, the pin 2 of the buzzer BS1 is pulled low, and the buzzer BS1 starts to work and emits a sound.

[0033] The temperature alarm circuit controls the passive buzzer design drive circuit through an NPN transistor. Resistor R91243 is a current limiting resistor to prevent excessive base current flowing through the transistor Q10857 from damaging the transistor. Resistor R91242 plays an important role. First, it acts as a pull-down resistor for the base of transistor Q10857. If the input terminal is left floating, resistor R91242 keeps transistor Q10857 in a reliably off state. Without resistor R91242, the PA5 input terminal is susceptible to interference, which could cause the transistor to unexpectedly flip state or enter an undesired amplification state, causing the buzzer BS1 to sound unexpectedly. Second, resistor R91242 increases the high-level threshold voltage. Without resistor R91242, the transistor's high-level threshold voltage is only 0.7V, meaning the transistor will turn on as long as the input voltage at PA5 exceeds 0.7V. Adding resistor R91243 changes the situation. The transistor will saturate and turn on only when the input voltage at PA5 reaches approximately 2.2V.

[0034] Capacitor C92048 eliminates EMI radiation from buzzer BS1. Capacitor C92049 acts as a power filter capacitor, filtering out high-frequency noise from the power supply. Capacitor C92047 effectively filters out interference signals in high-interference environments, preventing the buzzer from changing tone or unexpected sounding. Diode D1 provides freewheeling current, otherwise a reverse induced electromotive force (EMF) would be generated across buzzer BS1, generating a spike voltage of tens of volts, potentially damaging transistor Q10857 and interfering with other components of the entire circuit system.

[0035] The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A graphics card over-temperature alarm circuit, characterized in that: It includes a main control MCU, a temperature detection circuit and a temperature alarm circuit. The temperature detection circuit is connected between the main control MCU and the graphics card. The temperature alarm circuit is connected to the main control MCU. The temperature 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 I2CS_SCL interface of the graphics card, and the field effect tube Q10856B is connected to the I2CS_SDA interface of the graphics card.

2. A graphics card over-temperature alarm circuit according to claim 1, characterized in that: The temperature detection circuit also includes a resistor R100, one end of the resistor R100 is connected to the I2CS_SCL interface of the graphics card, the other end of the resistor R100 is connected to the drain of the field effect transistor Q10856A, the source of the field effect transistor Q10856A is connected to pin 7 of the main control MCU, and the gate of the field effect transistor Q10856A is connected to a 1.8V voltage.

3. A graphics card over-temperature alarm circuit according to claim 1, characterized in that: The temperature detection circuit also includes a resistor R97, one end of which is connected to the I2CS_SDA interface of the graphics card, the other end of which is connected to the drain of the field effect transistor Q10856B, the source of the field effect transistor Q10856B is connected to pin 6 of the main control MCU, and the gate of the field effect transistor Q10856B is connected to a 1.8V voltage.

4. A graphics card over-temperature alarm circuit according to claim 1, characterized in that: The temperature detection circuit also includes a resistor R629 and a resistor R632, one end of the resistor R629 is connected to the I2CS_SCL interface of the graphics card, one end of the resistor R632 is connected to the I2CS_SDA interface of the graphics card, and the other end of the resistor R629 is connected to the other end of the resistor R632 and is connected to a 1.8V voltage.

5. The graphics card over-temperature alarm circuit according to claim 1, characterized in that: The temperature detection circuit also includes a resistor R91237 and a resistor R91238, one end of the resistor R91237 is connected to pin 7 of the main control MCU, one end of the resistor R91238 is connected to pin 6 of the main control MCU, and the other end of the resistor R91237 is connected to the other end of the resistor R91238 and is connected to a 5V voltage.

6. A graphics card over-temperature alarm circuit according to claim 1, characterized in that: The temperature alarm circuit includes a buzzer BS1, a transistor Q10857 and a resistor R91243, one end of the resistor R91243 is connected to pin 17 of the main control MCU, the other end of the resistor R91243 is connected to the base of the transistor Q10857, the collector of the transistor Q10857 is connected to pin 2 of the buzzer BS1, the emitter of the transistor Q10857 is grounded, and pin 1 of the buzzer BS1 is connected to a 5V voltage.

7. A graphics card over-temperature alarm circuit according to claim 6, characterized in that: The temperature alarm circuit also includes a capacitor C92048, a capacitor C92049 and a diode D1, one end of the capacitor C92049 is connected to pin 1 of the buzzer BS1, the other end of the capacitor C92049 is grounded, the cathode of the diode D1 is connected to pin 1 of the buzzer BS1, the anode of the diode D1 is connected to pin 2 of the buzzer BS1, one end of the capacitor C92048 is connected to pin 1 of the buzzer BS1, and the other end of the capacitor C92048 is connected to pin 2 of the buzzer BS1.

8. The graphics card over-temperature alarm circuit according to claim 6, characterized in that: The temperature alarm circuit further includes a capacitor C92047, one end of the capacitor C92047 is connected to the base of the transistor Q10857, and the other end of the capacitor C92047 is grounded.

9. The graphics card over-temperature alarm circuit according to claim 6, characterized in that: The temperature alarm circuit also includes a resistor R91242, one end of the resistor R91242 is connected to the other end of the resistor R91243, and the other end of the resistor R91242 is grounded.

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