A graphic card temperature overhigh alarm circuit

Abstract

The utility model discloses a kind of graphic card temperature is too high alarm circuit, including graphic card and main control MCU, and the main control MCU is electrically connected with temperature detection circuit, multi-mode alarm circuit and threshold adjustment module;The main control MCU includes MCU chip, and the pin 1 of MCU chip is grounded, and the pin 24 of MCU chip is electrically connected with one end of capacitor C1, and the other end of capacitor C1 is grounded;The temperature detection circuit includes thermistor NTC, and thermistor NTC is attached to the surface of graphic card.The utility model monitors graphic card temperature by double detection mechanism, can effectively avoid the situation that single point failure leads to functional failure, improve monitoring stability, and when temperature is too high, it can realize sound-light screen linkage warning, to facilitate personnel to perceive, improve alarm effect, in addition, by the way that potentiometer RP can self-defined alarm threshold, so that it can adapt to the demand of different graphic card model, improve application range.

Description

Technical Field

[0001] This utility model relates to the field of graphics card temperature monitoring technology, and in particular to a graphics card overheat alarm circuit. Background Technology

[0002] The normal operating temperature range for a graphics card GPU is between 30℃ and 85℃. If the user's environment is too dusty, or if the thermal paste is dried out or ineffective, the heat dissipation efficiency will decrease, leading to poor graphics card cooling. The graphics card's operating temperature will exceed the reasonable range, resulting in frequency and power throttling, leading to a poor user experience. To address this, announcement number CN222801148U discloses a graphics card overheat 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 alarm circuit is connected to the main control MCU. The temperature detection circuit includes MOSFETs Q10856A and Q10856B. MOSFET Q10856A is connected to the I2CS_SCL interface of the graphics card, and MOSFET Q10856B is connected to the I2CS_SDA interface of the graphics card. With this circuit design, when the graphics card temperature is too high, an alarm can be issued in time, which can notify the user in advance to shut down the power for cooling, check the heat dissipation system and clean the dust in the heat sink fins, and replace the thermal paste on the graphics card chip to reduce unnecessary damage.

[0003] The graphics card overheat alarm circuit disclosed in the aforementioned patent, while capable of providing an overheat alarm, still has the following shortcomings: 1. The circuit reads data from the graphics card GPU's built-in temperature sensor via the I2C interface, but if the GPU's sensor is damaged or communication is abnormal, the circuit will be unable to obtain temperature information, causing the alarm function to fail; 2. It only uses a buzzer to sound the alarm, lacking multimodal prompts. In noisy environments, the buzzer may not be easily noticed by the user, resulting in poor alarm performance. In view of the above, this application proposes a graphics card overheat alarm circuit. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a graphics card overheat alarm circuit.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A graphics card overheat alarm circuit includes a graphics card and a main control MCU, wherein the main control MCU is electrically connected to a temperature detection circuit, a multi-mode alarm circuit and a threshold adjustment module;

[0007] The main control MCU includes an MCU chip, pin 1 of the MCU chip is grounded, pin 24 of the MCU chip is electrically connected to one end of a capacitor C1, and the other end of the capacitor C1 is grounded.

[0008] The temperature detection circuit includes a thermistor NTC, which is attached to the surface of the graphics card. One end of the thermistor NTC is electrically connected to one end of capacitor C2, one end of resistor R2, and one end of resistor R1. The other ends of capacitor C2 and the thermistor NTC are both grounded. The other end of resistor R1 is electrically connected to one end of capacitor C3, and the other end of capacitor C3 is grounded. The other end of resistor R1 is electrically connected to pin 2 of the MCU chip.

[0009] Preferably, the multi-mode alarm circuit includes a comparator U1. Pin 1 of the comparator U1 is electrically connected to one end of a resistor R3 and is electrically connected to the MCU chip. Pin 3 of the comparator U1 is electrically connected to one end of an indicator LED and pin 1 of a buzzer BZ. Pin 3 of the comparator U1 is electrically connected to the other end of a resistor R3. Pin 2 of the comparator U1 is electrically connected to one end of a resistor R4. The other end of a resistor R4 and pin 2 of a buzzer BZ are both grounded. The other end of the indicator LED is electrically connected to one end of a capacitor C4, one end of a resistor R5, and pin 1 of a display TEMP. The other ends of a capacitor C4, the other end of a resistor R5, and pin 2 of a display TEMP are all grounded.

[0010] Preferably, the threshold adjustment module includes a potentiometer RP, with one pin of potentiometer RP electrically connected to one end of capacitor C5, the other end of capacitor C5 electrically connected to one end of resistor R6, one pin of potentiometer RP electrically connected to one end of resistor R7, one pin of potentiometer RP grounded, one pin of potentiometer RP electrically connected to pin 20 of MCU chip, and the other ends of resistor R6 and resistor R7 electrically connected to the same high level VCC.

[0011] Preferably, the graphics card has a built-in temperature sensor, and the I2CS-SDA pin and I2CS-SCL pin of the temperature sensor are electrically connected to pin 6 and pin 7 of the MCU chip, respectively.

[0012] Preferably, resistor R1 is a pull-up resistor, and resistor R1 and the thermistor NTC form a voltage divider circuit to convert temperature changes into voltage signals. Capacitor C2 is a high-frequency filter capacitor used to filter out noise interference from the thermistor NTC leads. Capacitor C3 is a low-pass filter capacitor used to smooth the input voltage and prevent instantaneous fluctuations.

[0013] Preferably, the comparator U1 is used to compare the temperature signal voltage with a threshold to trigger an alarm; resistor R3 is a pull-up resistor to ensure that the voltage is stable when the comparator U1 outputs a high level; resistor R4 is a pull-down resistor to set the reference threshold at the input of the comparator U1; and capacitor C4 is a filter capacitor to stabilize the power supply of the indicator LED and the display TEMP.

[0014] Preferably, the potentiometer RP is an adjustable resistor, the sliding pin 2 outputs a voltage divider value to set the threshold voltage, resistors R6 and R7 are both protective resistors to prevent excessive current when the potentiometer RP is short-circuited, and capacitor C5 is a low-pass filter capacitor to smooth voltage fluctuations output by the potentiometer RP.

[0015] Compared with existing technologies, the beneficial effects of this utility model are:

[0016] This invention monitors graphics card temperature through a dual detection mechanism, which can effectively avoid functional failure due to single-point faults, improve monitoring stability, and realize sound, light and screen linkage warning when the temperature is too high, so as to facilitate personnel to notice and improve the alarm effect. In addition, the alarm threshold can be customized through potentiometer RP, so as to adapt to the needs of different graphics card models and improve the applicability. Attached Figure Description

[0017] Figure 1 This is a connection block diagram of a graphics card overheat alarm circuit proposed in this utility model;

[0018] Figure 2 The circuit diagram of the main control MCU in the graphics card overheat alarm circuit proposed in this utility model;

[0019] Figure 3 The circuit diagram of the temperature detection circuit in the graphics card overheat alarm circuit proposed in this utility model;

[0020] Figure 4 The circuit diagram of a multi-mode alarm circuit in a graphics card overheat alarm circuit proposed in this utility model;

[0021] Figure 5 The circuit diagram of the threshold adjustment module in the graphics card overheat alarm circuit proposed in this utility model. Detailed Implementation

[0022] 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.

[0023] Reference Figure 1-5A graphics card overheat alarm circuit includes a graphics card and a main control MCU. The main control MCU is electrically connected to a temperature detection circuit, a multi-mode alarm circuit and a threshold adjustment module.

[0024] The main control MCU includes an MCU chip. Pin 1 of the MCU chip is grounded. Pin 24 of the MCU chip is electrically connected to one end of capacitor C1, and the other end of capacitor C1 is grounded. The graphics card has a built-in temperature sensor. The I2CS-SDA and I2CS-SCL pins of the temperature sensor are electrically connected to pins 6 and 7 of the MCU chip, respectively.

[0025] The temperature detection circuit includes a thermistor NTC, which is attached to the surface of the graphics card. One end of the thermistor NTC is electrically connected to one end of capacitor C2, one end of resistor R2, and one end of resistor R1. The other ends of capacitor C2 and the thermistor NTC are both grounded. The other end of resistor R1 is electrically connected to one end of capacitor C3, and the other end of capacitor C3 is grounded. The other end of resistor R1 is electrically connected to pin 2 of the MCU chip. Resistor R1 is a pull-up resistor. Resistor R1 and the thermistor NTC form a voltage divider circuit to convert temperature changes into a voltage signal. Capacitor C2 is a high-frequency filter capacitor used to filter out noise interference from the thermistor NTC leads. Capacitor C3 is a low-pass filter capacitor used to smooth the input voltage and prevent instantaneous fluctuations.

[0026] The multi-mode alarm circuit includes a comparator U1. Pin 1 of comparator U1 is electrically connected to one end of resistor R3 and is electrically connected to the MCU chip. Pin 3 of comparator U1 is electrically connected to one end of indicator LED and pin 1 of buzzer BZ. Pin 3 of comparator U1 is electrically connected to the other end of resistor R3. Pin 2 of comparator U1 is electrically connected to one end of resistor R4. The other end of resistor R4 and pin 2 of buzzer BZ are both grounded. The other end of indicator LED is electrically connected to one end of capacitor C4, one end of resistor R5, and pin 1 of display TEMP. The other end of capacitor C4, the other end of resistor R5, and pin 2 of display TEMP are all grounded. Comparator U1 is used to compare the temperature signal voltage with a threshold to trigger an alarm. Resistor R3 is a pull-up resistor to ensure voltage stability when comparator U1 outputs a high level. Resistor R4 is a pull-down resistor to set the reference threshold at the input of comparator U1. Capacitor C4 is a filter capacitor to stabilize the power supply of indicator LED and display TEMP.

[0027] The threshold adjustment module includes a potentiometer RP. Pin 1 of the potentiometer RP is electrically connected to one end of capacitor C5, and the other end of capacitor C5 is electrically connected to one end of resistor R6. Pin 3 of the potentiometer RP is electrically connected to one end of resistor R7. Pin 3 of the potentiometer RP is grounded. Pin 2 of the potentiometer RP is electrically connected to pin 20 of the MCU chip. The other ends of resistors R6 and R7 are electrically connected to the same high-level VCC. The potentiometer RP is an adjustable resistor. The sliding pin 2 outputs a voltage divider value to set the threshold voltage. Resistors R6 and R7 are both protective resistors to prevent excessive current when the potentiometer RP is short-circuited. Capacitor C5 is a low-pass filter capacitor to smooth the voltage fluctuations output by the potentiometer RP.

[0028] This invention monitors graphics card temperature through a dual detection mechanism, which can effectively avoid functional failure due to single-point faults, improve monitoring stability, and realize sound, light and screen linkage warning when the temperature is too high, so as to facilitate personnel to notice and improve the alarm effect. In addition, the alarm threshold can be customized through potentiometer RP, so as to adapt to the needs of different graphics card models and improve the applicability.

[0029] Working Principle: During use, a threshold value is preset. When setting the threshold, rotating the potentiometer RP adjusts the voltage division value at pin 2, which is output to pin 20 of the MCU chip. The alarm threshold is updated in real time based on the ADC value. The graphics card's built-in temperature sensor directly reads the internal temperature data via the I2C interface. Simultaneously, a thermistor NTC attached to the graphics card surface detects the surface temperature. Since the thermistor NTC and resistor R1 form a voltage divider circuit, temperature changes are converted into voltage signals and transmitted to pin 2 of the MCU chip. Pin 2 of the MCU chip samples the signal, while capacitor C2 filters out high voltage. To reduce noise, capacitor C3 smooths the input voltage, ensuring data stability. The detected temperature value and threshold are transmitted to comparator U1 via the MCU chip. Comparator U1 compares the temperature signal with the threshold. When the temperature exceeds the limit, comparator U1 triggers a multi-mode alarm: buzzer BZ sounds, indicator LED changes color, and display TEMP shows the real-time temperature, achieving a combined sound, light, and screen warning, making it easier for personnel to notice and improving the alarm effect. In addition, by simultaneously monitoring the temperature using the built-in sensor on the graphics card and the external thermistor NTC, the possibility of single-point failure leading to functional failure can be effectively avoided, significantly improving monitoring stability.

[0030] 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 graphics card overheat alarm circuit, comprising a graphics card and a main control MCU, characterized in that, The main control MCU is electrically connected to a temperature detection circuit, a multi-mode alarm circuit, and a threshold adjustment module; The main control MCU includes an MCU chip, pin 1 of the MCU chip is grounded, pin 24 of the MCU chip is electrically connected to one end of a capacitor C1, and the other end of the capacitor C1 is grounded. The temperature detection circuit includes a thermistor NTC, which is attached to the surface of the graphics card. One end of the thermistor NTC is electrically connected to one end of capacitor C2, one end of resistor R2, and one end of resistor R1. The other ends of capacitor C2 and the thermistor NTC are both grounded. The other end of resistor R1 is electrically connected to one end of capacitor C3, and the other end of capacitor C3 is grounded. The other end of resistor R1 is electrically connected to pin 2 of the MCU chip.

2. The graphics card overheat alarm circuit according to claim 1, characterized in that, The multi-mode alarm circuit includes a comparator U1. Pin 1 of the comparator U1 is electrically connected to one end of a resistor R3 and is electrically connected to the MCU chip. Pin 3 of the comparator U1 is electrically connected to one end of an indicator LED and pin 1 of a buzzer BZ. Pin 3 of the comparator U1 is electrically connected to the other end of a resistor R3. Pin 2 of the comparator U1 is electrically connected to one end of a resistor R4. The other end of a resistor R4 and pin 2 of a buzzer BZ are both grounded. The other end of the indicator LED is electrically connected to one end of a capacitor C4, one end of a resistor R5, and pin 1 of a display TEMP. The other ends of a capacitor C4, the other end of a resistor R5, and pin 2 of a display TEMP are all grounded.

3. The graphics card overheat alarm circuit according to claim 1, characterized in that, The threshold adjustment module includes a potentiometer RP. One pin of the potentiometer RP is electrically connected to one end of a capacitor C5, and the other end of the capacitor C5 is electrically connected to one end of a resistor R6. One pin of the potentiometer RP is electrically connected to one end of a resistor R7. One pin of the potentiometer RP is grounded. One pin of the potentiometer RP is electrically connected to one pin of the MCU chip 20. The other ends of resistors R6 and R7 are electrically connected to the same high-level voltage VCC.

4. The graphics card overheat alarm circuit according to claim 1, characterized in that, The graphics card has a built-in temperature sensor, and the I2CS-SDA and I2CS-SCL pins of the temperature sensor are electrically connected to pins 6 and 7 of the MCU chip, respectively.

5. The graphics card overheat alarm circuit according to claim 1, characterized in that, The resistor R1 is a pull-up resistor. Resistor R1 and the thermistor NTC form a voltage divider circuit to convert temperature changes into voltage signals. Capacitor C2 is a high-frequency filter capacitor used to filter out noise interference from the thermistor NTC leads. Capacitor C3 is a low-pass filter capacitor used to smooth the input voltage and prevent instantaneous fluctuations.

6. The graphics card overheat alarm circuit according to claim 2, characterized in that, The comparator U1 is used to compare the temperature signal voltage with a threshold to trigger an alarm. Resistor R3 is a pull-up resistor to ensure that the voltage is stable when the comparator U1 outputs a high level. Resistor R4 is a pull-down resistor to set the reference threshold at the input of comparator U1. Capacitor C4 is a filter capacitor to stabilize the power supply of the indicator LED and the display TEMP.

7. The graphics card overheat alarm circuit according to claim 3, characterized in that, The potentiometer RP is an adjustable resistor, and the sliding pin 2 outputs a voltage divider value to set the threshold voltage. Resistors R6 and R7 are both protective resistors to prevent excessive current when the potentiometer RP is short-circuited. Capacitor C5 is a low-pass filter capacitor to smooth voltage fluctuations output by the potentiometer RP.

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