Over-temperature protection circuit of integrated circuit chip

Abstract

The utility model relates to an over-temperature protection circuit of an integrated circuit chip, and the circuit comprises a constant current source module which is connected with a temperature sampling module and is used for providing constant current for the temperature sampling module; the temperature sampling module comprises a temperature sensor and a temperature operational amplifier, the positive input end of the temperature operational amplifier is connected to the temperature sensor, and the temperature operational amplifier is used for converting temperature signals collected by the temperature sensor into voltage signals; the filtering module is connected with the output end of the temperature operational amplifier; the amplification module is connected with the output end of the filtering module and is used for amplifying the voltage signal and outputting the amplified voltage signal to the comparison module; the reference voltage module is connected with the power supply; the comparison module is connected with the output end of the amplification module and the output end of the reference voltage module and is used for comparing the amplified voltage signal with the reference voltage; and the indicating lamp prompting module is connected with the comparison module. According to the technical scheme, the safety of the integrated circuit is ensured, and damage caused by over-temperature is prevented.

Description

Technical Field

[0001] The present application relates to the field of circuit protection technology, and in particular to an over-temperature protection circuit for an integrated circuit chip. Background Art

[0002] In modern electronic systems, integrated circuits (ICs) serve as core components and play a key role in various electronic products. As the integration level of electronic devices continues to increase, the design of ICs has become increasingly complex, and their power density has gradually increased, especially in high-frequency, high-power applications. This high-power density makes ICs prone to generating large amounts of heat during operation, especially under high-load conditions during the testing phase, when chip temperatures rise rapidly, easily leading to overheating. In traditional testing processes, due to the lack of effective external temperature monitoring and dynamic protection mechanisms, ICs may fail to respond in a timely manner when temperatures are too high, resulting in unstable performance, affecting test accuracy, and even posing the risk of component damage.

[0003] Existing overtemperature protection technologies primarily rely on built-in protection within the chip, but this approach has limitations. Built-in thermal shutdown protection only activates when the chip temperature exceeds a specific value, often failing to provide rapid response and preventative measures. In certain high-precision electronic systems, this protection method struggles to cope with sudden high-temperature events. Furthermore, because traditional overtemperature protection devices lack external temperature sensing and control, operators struggle to monitor and manage the real-time temperature of the integrated circuit, making it difficult to quickly adjust test plans based on actual operating temperatures. This increases uncertainty during testing and application. Summary of the Invention

[0004] The purpose of this application is to provide an over-temperature protection circuit for an integrated circuit chip, which can monitor the temperature of the integrated circuit in real time and quickly execute protection measures when the temperature exceeds a set threshold, thereby achieving more comprehensive and efficient over-temperature protection during the integrated circuit testing process and ensuring the safety and accuracy of the testing process.

[0005] The purpose of this application is to achieve the following technical solution: an over-temperature protection circuit for an integrated circuit chip of the present application, the circuit comprising:

[0006] A constant current source module is connected to the temperature sampling module and is used to provide a constant current to the temperature sampling module;

[0007] A temperature sampling module includes a temperature sensor and a temperature operational amplifier, wherein the output end of the temperature sensor is connected to the positive input end of the temperature operational amplifier, and is used to convert the temperature signal collected by the temperature sensor into a voltage signal;

[0008] A filtering module, connected to the output end of the temperature operational amplifier, for filtering out high-frequency noise;

[0009] an amplifying module, connected to the output end of the filtering module, for amplifying the voltage signal and outputting the amplified voltage signal to the comparing module;

[0010] A reference voltage module is connected to the power supply and is used to provide a reference voltage for the comparison module;

[0011] a comparison module, connected to the output end of the amplification module and the output end of the reference voltage module, and configured to compare the amplified voltage signal with the reference voltage;

[0012] The indicator light prompt module is connected to the comparison module and is used to light up a prompt when the amplified voltage signal exceeds the reference voltage.

[0013] Optionally, the constant current source module includes a reference voltage source U7 and an operational amplifier U1, one end of the reference voltage source U7 is connected to an external power supply through a resistor R8, and the other end is grounded;

[0014] The positive input terminal of the operational amplifier U1 is connected between the reference voltage source U7 and the resistor R8 through the resistor R7, the negative input terminal of the operational amplifier U1 is grounded through the resistor R6, and the output terminal of the operational amplifier U1 is connected to the temperature sampling module through the resistor R11, and is connected to the negative input terminal of the operational amplifier U1 through the resistor R10.

[0015] Optionally, the constant current source module further includes an operational amplifier U2, the positive input terminal of the operational amplifier U2 is connected to the output terminal of the operational amplifier U1 through a resistor R11, and the output terminal of the operational amplifier U2 is connected between the resistor R7 and the positive input terminal of the operational amplifier U1 through a resistor R9.

[0016] Optionally, one end of the temperature sensor is grounded via a resistor R1, and the other end is connected to the output end of the operational amplifier U1 via a resistor R2 and a resistor R11 connected in series;

[0017] The positive input terminal of the temperature operational amplifier is connected between the temperature sensor and the resistor R2 through the resistor R3, the negative input terminal of the temperature operational amplifier is connected between the resistor R2 and the resistor R11 through the resistor R4, and the output terminal of the temperature operational amplifier is connected to the negative input terminal of the temperature operational amplifier through the resistor R5.

[0018] Optionally, the filtering module includes an operational amplifier U4, the positive input terminal of the operational amplifier U4 is connected to the output terminal of the temperature operational amplifier through a resistor R13 and a resistor R12 connected in series, and the positive input terminal of the operational amplifier U4 is also grounded through a capacitor C2; the negative input terminal of the operational amplifier U4 is grounded through a resistor R14; the output terminal of the operational amplifier U4 is connected to the negative input terminal of the operational amplifier U4 through a resistor R15, and the output terminal of the operational amplifier U4 is also connected between the resistor R12 and the resistor R13 through a resistor C1.

[0019] Optionally, the amplification module includes an operational amplifier U5, the positive input terminal of the operational amplifier U5 is connected to the output terminal of the operational amplifier U4 through a resistor R18, and the positive input terminal of the operational amplifier U5 is also grounded through a resistor R18 and a resistor R16 connected in series; the negative input terminal of the operational amplifier U5 is grounded through a resistor R17; and the output terminal of the operational amplifier U5 is connected to the negative input terminal of the operational amplifier U5 through a resistor R19.

[0020] Optionally, the reference voltage module includes a reference power supply chip U8, the input end of the reference power supply chip U8 is connected to the power supply, the output end is grounded through a resistor R21 and a resistor R22 connected in series, and the output end of the reference power supply chip U8 is also grounded through a capacitor C4.

[0021] Optionally, the comparison module includes an operational amplifier U6, the positive input terminal of the operational amplifier U6 is connected to the output terminal of the reference power supply chip U8; the negative input terminal of the operational amplifier U6 is connected to the output terminal of the operational amplifier U5, and the negative input terminal of the operational amplifier U6 is also grounded through a resistor R20; the output terminal of the operational amplifier U6 is connected to the indicator light prompt module.

[0022] Optionally, the output end of the operational amplifier U6 is further connected to an external power supply via a relay S1 .

[0023] Optionally, the indicator light prompt module includes an LED lamp and a transistor Q1, the base of the transistor Q1 is connected to the output end of the operational amplifier U6, and the collector of the transistor Q1 is grounded through the LED lamp and resistor R24 connected in series; the cathode of the LED lamp is also grounded through the capacitor C5.

[0024] Compared with the prior art, this application has the following beneficial effects:

[0025] The integrated circuit chip overtemperature protection circuit of this application achieves precise monitoring of IC temperature changes through the close cooperation of a constant current source module and a temperature sampling module. When the temperature exceeds the set threshold, the comparison module can respond quickly and activate the indicator light prompt module, thus providing a timely overtemperature warning. This mechanism not only enhances the safety and reliability of the integrated circuit, but also ensures the safety and accuracy of the testing process, effectively preventing damage to the integrated circuit due to overheating.

[0026] Furthermore, the over-temperature protection circuit of the integrated circuit chip of the present application further improves the performance of over-temperature protection in many aspects. The operational amplifier in the constant current source module optimizes the stability of the current output and ensures the accurate acquisition of the temperature signal. The filtering module effectively filters out noise to ensure clear transmission of the signal, while the amplification module improves the detectability of the signal and enhances the sensitivity of temperature monitoring. At the same time, the reference voltage module provides a stable reference voltage, which improves the accuracy of the comparison module, thereby ensuring the reliability of the system under various working conditions. The indicator light prompt module realizes intuitive status indication through the combination of LED and transistor, allowing users to understand the operating status of the system in a timely manner, further improving the convenience and safety of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic structural diagram of an integrated circuit chip over-temperature protection circuit according to an embodiment of the present application is shown;

[0028] Figure 2 A circuit diagram of an over-temperature protection circuit for an integrated circuit chip according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. It will be understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for ease of description, only some, rather than all, structures related to the present application are shown in the accompanying drawings. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0030] As used herein, the terms "comprise," "comprising," and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not limited to the listed steps or elements but may optionally include steps or elements not listed, or may optionally include other steps or elements inherent to the process, method, product, or apparatus.

[0031] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0032] Figure 1 FIG. 1 shows a schematic structural diagram of an integrated circuit chip over-temperature protection circuit according to an embodiment of the present application. Figure 1 As shown, the integrated circuit chip over-temperature protection circuit includes:

[0033] The constant current source module 100 is connected to the temperature sampling module 200 and is used to provide a constant current to the temperature sampling module 200 .

[0034] The current output by the constant current source module 100 is connected in series with the temperature sensor, so that the resistance value of the temperature sensor generates a corresponding voltage signal as the temperature changes while the current remains unchanged. The resistance value of the temperature sensor will change with temperature fluctuations, and the constant current source ensures that the current flowing through the temperature sensor is constant, so that the temperature change can be directly reflected through the voltage signal. This not only avoids the interference of current changes on the temperature signal, but also ensures the accuracy and consistency of temperature detection. By providing a constant current, the stability of the temperature signal is ensured, the accuracy of temperature sampling is guaranteed, and reliable basic data is provided for subsequent modules to judge temperature changes.

[0035] The temperature sampling module 200 includes a temperature sensor and a temperature operational amplifier. The output end of the temperature sensor is connected to the positive input end of the temperature operational amplifier, which is used to convert the temperature signal collected by the temperature sensor into a voltage signal.

[0036] Temperature sensors are typically thermistors or semiconductor sensors with linear temperature characteristics. These components convert temperature changes into changes in resistance or current. Current from a constant current source flows through the temperature sensor. According to Ohm's law, the change in sensor resistance generates a corresponding voltage signal. The temperature sensor's output voltage signal is connected to an operational amplifier, which amplifies the sensor signal for subsequent processing. The operational amplifier is typically configured in single-ended input mode, making temperature changes easier to detect and preventing signal distortion. The temperature sensor senses the ambient temperature in real time, and the operational amplifier amplifies the signal for subsequent circuit processing, enabling the entire circuit to accurately and quickly respond to temperature changes. This module collects and converts the temperature signal, providing temperature information to the entire protection circuit, enabling the system to take appropriate measures if the temperature exceeds the specified limit.

[0037] The filtering module 300 is connected to the output end of the temperature operational amplifier and is used to filter out high-frequency noise.

[0038] The filter module 300 is usually composed of capacitors and resistors to form a low-pass filter circuit, which is connected to the output end of the temperature operational amplifier to filter out high-frequency noise in the temperature signal and improve signal quality. By filtering out interference signals and noise, the filter module 300 can reduce errors and ensure that the temperature signal transmitted to the amplification module 400 is more stable and pure. The filter module 300 ensures the accuracy of the temperature signal, avoids misjudgment due to noise interference, and enables the system to respond correctly when the actual temperature exceeds the safety threshold. The filtered temperature signal is smooth and noise-free, making it more suitable for entering the amplification module 400.

[0039] The amplifying module 400 is connected to the output end of the filtering module 300 , and is configured to amplify the voltage signal and output the amplified voltage signal to the comparing module 600 .

[0040] The amplifier module 400 further amplifies the filtered voltage signal to enhance the signal strength, making the signal easier to detect. The amplifier module 400 improves the detection sensitivity of the temperature signal, allowing even small temperature changes to be amplified, ensuring that even slight temperature rises can be captured. The amplifier module 400 increases the strength of the temperature signal, allowing the temperature sensor's tiny signal to significantly exceed the set reference voltage after amplification, ensuring that the comparison module 600 can sensitively detect temperature changes and trigger protection actions.

[0041] The reference voltage module 500 is connected to a power supply and is used to provide a reference voltage for the comparison module 600 .

[0042] The reference voltage module 500 is connected to a power supply and provides a stable reference voltage for the comparison module 600. The reference voltage module 500 can generate a stable reference voltage through a voltage stabilizing chip (such as a three-terminal voltage regulator) or a high-precision reference voltage source. It is usually composed of a power supply and components such as a voltage divider resistor and a voltage regulator to ensure that the reference voltage does not change with fluctuations in the external power supply. The voltage provided by the reference voltage module 500 is used for comparison and judgment with the temperature signal. The reference value is usually set at the voltage value corresponding to the safe operating temperature of the chip to ensure that the system only triggers an alarm when the temperature exceeds the standard, and does not falsely trigger the protection function due to fluctuations in the reference voltage.

[0043] The comparison module 600 is connected to the output end of the amplification module 400 and the output end of the reference voltage module 500, and is used to compare the amplified voltage with the reference voltage.

[0044] The comparison module 600 is composed of a voltage comparator, which compares the amplified voltage with the reference voltage, which is equivalent to comparing the temperature signal voltage with the reference voltage. The output of the comparator will be triggered when the temperature signal voltage is higher than the reference voltage, thereby sending an action signal to the indicator light module or the power-off module. Generally, a high-speed comparator is selected to increase the response speed and ensure that the temperature exceeding the standard can be detected quickly. When the amplified temperature signal exceeds the reference voltage, it indicates that the chip temperature has exceeded the safety threshold. At this time, the comparison module 600 outputs a high-level signal, driving the indicator light to light up and cutting off the circuit power supply to protect the chip from damage caused by excessive temperature.

[0045] The indicator light prompt module 700 is connected to the comparison module 600 and is used to light up a prompt when the amplified voltage signal exceeds the reference voltage.

[0046] When the temperature signal exceeds the reference voltage, comparison module 600 triggers the module, illuminating the indicator light to provide a visual overtemperature warning. The indicator light visually displays system status, allowing users to promptly understand the system's temperature status and take necessary actions. When an overtemperature condition occurs, the indicator light illuminates to alert the user and simultaneously triggers an automatic power-off mechanism, stopping power to the circuit, effectively protecting the integrated circuit chip from overtemperature.

[0047] According to the above embodiment, the integrated circuit chip overtemperature protection circuit of the present application achieves precise monitoring of integrated circuit temperature changes through the close cooperation of the constant current source module 100 and the temperature sampling module 200. When the temperature exceeds the set threshold, the comparison module 600 can respond quickly and activate the indicator prompt module 700, thereby providing a timely overtemperature warning. This mechanism not only enhances the safety and reliability of the integrated circuit, but also ensures the safety and accuracy of the testing process, effectively preventing damage to the integrated circuit due to overheating.

[0048] Figure 2 FIG. 1 shows an over-temperature protection circuit diagram of an integrated circuit chip according to an embodiment of the present application. Figure 2As shown, in the over-temperature protection circuit of the integrated circuit chip, the constant current source module 100 includes an operational amplifier U1, an operational amplifier U2, a reference voltage source U7, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10 and a resistor R11; the temperature sampling module 200 includes a temperature operational amplifier U3, a temperature sensor PT100, a resistor R1, a resistor R2, a resistor R3, a resistor R4 and a resistor R5; the filtering module 300 includes an operational amplifier U4, a resistor R12, a resistor R13, a resistor R14, Resistor R15, capacitor C1 and capacitor C2; the reference voltage module 500 includes an operational amplifier U8, a resistor R21, a resistor R22, a capacitor C3 and a capacitor C4; the amplification module 400 includes an operational amplifier U5, a resistor R16, a resistor R17, a resistor R18, a resistor R19 and a resistor R20; the comparison module 600 includes an operational amplifier U6, a resistor R20, a resistor R23 and a capacitor C6; the indicator light prompt module 700 includes an LED1, a transistor Q1, a resistor R24, a resistor R25 and a capacitor C5.

[0049] Specifically, one end of the reference voltage source U7 in the constant current source module 100 is connected to the external power supply through the resistor R8, and the other end is grounded. This connection ensures that U7 can generate a stable reference voltage that does not change with load changes or external power fluctuations.

[0050] At the same time, the positive input of the operational amplifier U1 is connected to the reference voltage source U7 and resistor R8 via resistor R7, the negative input of the operational amplifier U1 is grounded via resistor R6, the output of the operational amplifier U1 is connected to the temperature sampling module 200 via resistor R11, and is also connected to the negative input of the operational amplifier U1 via resistor R10. Because the reference voltage source U7 provides a stable voltage, the voltage at the positive input of the operational amplifier U1 is a fixed value. According to the "virtual short" characteristic of the operational amplifier (the positive and negative input voltages are equal), the operational amplifier U1 automatically adjusts the output voltage so that the voltage at the negative input is equal to the positive input. The negative input of the operational amplifier U1 is grounded via resistor R6, and the output of the operational amplifier U1 is fed back to the negative input via R10. In this way, the connection point between the output of the operational amplifier U1 and R11 generates a stable constant current flowing to the temperature sampling module 200. This current depends only on the value of R10 and the reference voltage and is not affected by temperature changes or load fluctuations, thereby achieving a constant current output. Through reference voltage source U7 and the feedback resistor network (R6, R7, R10, etc.), this circuit provides a precise and constant current. This stable constant current provides reliable operating conditions for the temperature sensor, allowing the voltage signal output by temperature sampling module 200 to directly reflect temperature changes. This constant current ensures that the voltage signal output by the temperature sensor accurately reflects temperature changes, reducing errors caused by current fluctuations, improving temperature measurement accuracy, and providing accurate temperature information for subsequent overtemperature protection.

[0051] In some embodiments, the constant current source module 100 further includes an operational amplifier U2, the positive input of which is connected to the output of the operational amplifier U1 via a resistor R11, and the output of the operational amplifier U2 is connected between the resistor R7 and the positive input of the operational amplifier U1 via a resistor R9. In the constant current source module 100, the operational amplifier U2 acts as a voltage follower, isolating the output signal of the operational amplifier U1 and stably feeding it back to the positive input of the operational amplifier U1, thereby forming a high-precision voltage control. This connection method effectively reduces noise interference by improving voltage stability and isolating the load effect, making the constant current source output current more stable, and significantly improving the accuracy and reliability of the entire over-temperature protection circuit.

[0052] like Figure 2 As shown, in the temperature sampling module 200 , one end of the temperature sensor is grounded via a resistor R1 , and the other end is connected to the output end of the operational amplifier U1 via a resistor R2 and a resistor R11 connected in series.

[0053] In some embodiments, a platinum resistor is selected as a temperature sensor based on its excellent temperature measurement performance. However, due to the possible self-heating effect of the platinum resistor, a PT100 model with a smaller resistance value was ultimately selected. This model has a resistance value of 100Ω at 0°C, and its resistance value shows good linearity and stability when the temperature rises, making it suitable for high-precision temperature measurement applications. When the temperature rises, the resistance of the PT100 increases, causing the voltage signal (i.e., the temperature signal) across it to change accordingly. This voltage signal is sent to the input of the operational amplifier through R2 and R11. This connection method allows voltage distribution to be formed between the temperature sensor and the operational amplifier, thereby converting the small voltage changes generated by the sensor into a signal suitable for processing by the operational amplifier.

[0054] The positive input terminal of the temperature operational amplifier U3 is connected between the temperature sensor and the resistor R2 through the resistor R3, the negative input terminal of the temperature operational amplifier U3 is connected between the resistor R2 and the resistor R11 through the resistor R4, and the output terminal of the temperature operational amplifier U3 is connected to the negative input terminal of the temperature operational amplifier through the resistor R5.

[0055] The positive input of temperature operational amplifier U3 receives the voltage signal from the PT100 temperature sensor, while the negative input forms a reference voltage. The output voltage of temperature operational amplifier U3 is proportional to the difference between the input voltages, resulting in amplification. Through feedback resistor R5, temperature operational amplifier U3 forms negative feedback, ensuring stable system gain. Furthermore, through this feedback mechanism, temperature operational amplifier U3 ensures that the output signal maintains a linear relationship with the input signal, accurately reflecting voltage changes caused by temperature fluctuations. Temperature operational amplifier U3 has a high gain characteristic, capable of amplifying even small temperature change signals, allowing subsequent circuits to reliably detect and process the signal.

[0056] Furthermore, as can be seen from the connection relationship above, the PT100 temperature sensor uses a three-wire connection. Compared to the traditional two-wire connection, this design effectively eliminates the impact of lead resistance on measurement accuracy, thereby reducing errors. Furthermore, compared to the four-wire connection, the three-wire connection has a simpler circuit design, making it easier to implement and maintain, while also significantly reducing costs.

[0057] like Figure 2As shown, the filtering module 300 includes an operational amplifier U4, the positive input terminal of the operational amplifier U4 is connected to the output terminal of the temperature operational amplifier through a resistor R13 and a resistor R12 connected in series, and the positive input terminal of the operational amplifier U4 is also grounded through a capacitor C2; the negative input terminal of the operational amplifier U4 is grounded through a resistor R14; the output terminal of the operational amplifier U4 is connected to the negative input terminal of the operational amplifier U4 through a resistor R15, and the output terminal of the operational amplifier U4 is also connected between the resistor R12 and the resistor R13 through a resistor C1.

[0058] The positive input of operational amplifier U4 is connected to the output of the temperature operational amplifier via series resistors R12 and R13, and to ground via capacitor C2 to filter high-frequency noise. The negative input of operational amplifier U4 is grounded via resistor R14, forming a negative feedback loop. Meanwhile, its output is fed back to the negative input via resistor R15 and connected to capacitor C1, forming a low-pass filter. This configuration effectively eliminates high-frequency interference in the input signal, thereby improving signal quality.

[0059] Through the operational amplifier's feedback mechanism and low-pass filtering characteristics, the filter module 300 effectively suppresses high-frequency noise and interference signals in the system, ensuring accurate transmission of the temperature signal. This design not only improves signal stability but also enhances the performance of subsequent circuits (such as the amplifier module 400 and the comparison module 600), enabling them to more accurately respond to temperature changes, thereby improving the reliability and accuracy of the entire over-temperature protection circuit.

[0060] like Figure 2 As shown, the amplification module 400 includes an operational amplifier U5, the positive input terminal of the operational amplifier U5 is connected to the output terminal of the operational amplifier U4 through a resistor R18, and the positive input terminal of the operational amplifier U5 is also grounded through a resistor R18 and a resistor R16 connected in series; the negative input terminal of the operational amplifier U5 is grounded through a resistor R17; and the output terminal of the operational amplifier U5 is connected to the negative input terminal of the operational amplifier U5 through a resistor R19.

[0061] The input of the operational amplifier U5 is connected to the output of the operational amplifier U4 through a resistor R18, and is grounded through a series resistor R16 to provide a reference voltage. The negative input of the operational amplifier U5 is grounded through a resistor R17, forming a negative feedback loop, and its output is fed back to the negative input through a resistor R19. This configuration enables the operational amplifier U5 to amplify the input signal accordingly according to the changes in the input signal, thereby enhancing the amplitude of the signal. The amplifier module 400 can effectively amplify the filtered temperature signal and improve the detectability of the signal through the gain configuration of the operational amplifier U5. This enhanced signal not only helps the subsequent comparison module 600 to more accurately judge temperature changes, but also improves the sensitivity and accuracy of the entire system, ensuring that the over-temperature protection circuit can respond to abnormal temperature fluctuations in a timely manner, thereby improving the safety and reliability of the equipment.

[0062] like Figure 2 As shown, the reference voltage module 500 includes a reference power supply chip U8, the input end of the reference power supply chip U8 is connected to the power supply, the output end is grounded through the series-connected resistors R21 and R22, and the output end of the reference power supply chip U8 is also grounded through the capacitor C4.

[0063] The input of reference power chip U8 is connected to an external power supply, providing a stable power input for the module. The output of reference power chip U8 is connected to ground via series resistors R21 and R22, forming a voltage divider circuit to provide a stable and accurate reference voltage. Furthermore, the output is connected to ground via capacitor C4 to further smooth the output voltage, filter out power supply noise and transient interference, and ensure reference voltage stability.

[0064] The stable reference voltage provided by reference voltage module 500 is crucial to the entire over-temperature protection circuit. It ensures that comparison module 600 can accurately compare the amplified temperature signal with the set threshold. This stability improves system reliability, enabling accurate response under various operating conditions, effectively preventing circuit damage or failure caused by temperature anomalies. A stable reference voltage also enhances the system's resistance to noise interference, ensuring accurate signal processing.

[0065] like Figure 2 As shown, the comparison module 600 includes an operational amplifier U6, the positive input terminal of the operational amplifier U6 is connected to the output terminal of the reference power supply chip U8; the negative input terminal of the operational amplifier U6 is connected to the output terminal of the operational amplifier U5, and the negative input terminal of the operational amplifier U6 is also grounded through the resistor R20; the output terminal of the operational amplifier U6 is connected to the indicator light prompt module 700.

[0066] The positive input of operational amplifier U6 is directly connected to the output of reference power supply chip U8 to obtain a stable reference voltage. The negative input is connected to the output of amplifier module 400 to receive the amplified temperature signal. The negative input is also grounded through resistor R20, forming a feedback loop to ensure the stability and accuracy of the operational amplifier. When the amplified temperature signal voltage exceeds the reference voltage, the output of operational amplifier U6 generates a high-level signal and transmits it to indicator light module 700. The main benefit of comparison module 600 is that it can monitor the relationship between the temperature signal and the reference voltage in real time, thereby achieving effective overtemperature detection. When the temperature exceeds the set threshold, the rapid response of operational amplifier U6 can promptly trigger indicator light module 700, thereby issuing an overtemperature warning. This timely feedback mechanism significantly improves system safety and prevents circuit damage or failure that may be caused by overheating. Through precise comparison and fast response, the reliability and stability of the integrated circuit during operation are ensured.

[0067] In some embodiments, the output terminal of the operational amplifier U6 is further connected to an external power supply through a relay S1 .

[0068] The output of operational amplifier U6 is not only connected to the indicator light module 700, but also to the external power supply via relay S1. When the output signal of operational amplifier U6 goes high, relay S1 is activated, thereby disconnecting the external power supply and stopping the power supply to the device. This design allows the system to quickly cut off the power supply in the event of an overtemperature, preventing damage to the device or further overheating, and enhancing the protection mechanism of the integrated circuit. By combining the output of operational amplifier U6 with relay S1, the system can implement an automatic power-off function, ensuring that the device stops operating immediately when an overtemperature warning is issued. This not only effectively prevents potential hardware damage but also improves the safety and stability of the entire system. At the same time, users can be notified of the overtemperature status in a timely manner through the indicator light module 700, making operation safer and more reliable. Overall, this connection method significantly improves the system's adaptability and safety protection level in high-temperature environments.

[0069] like Figure 2 As shown, the indicator light prompt module 700 includes an LED lamp and a transistor Q1. The base of the transistor Q1 is connected to the output end of the operational amplifier U6. The collector of the transistor Q1 is grounded through the LED lamp and the resistor R24 connected in series; the cathode of the LED lamp is also grounded through the capacitor C5.

[0070] The indicator module 700 consists of an LED and transistor Q1. The base of transistor Q1 is connected to the output of operational amplifier U6. When the output of operational amplifier U6 is high, transistor Q1 is activated, allowing current to flow through the LED and series resistor R24, causing the LED to illuminate. This mechanism allows users to visually identify whether the device is overheating. Furthermore, the cathode of the LED is grounded via capacitor C5, further enhancing the circuit's stability and anti-interference capabilities. The design of the indicator module 700 allows users to quickly receive overtemperature warnings by illuminating the LED, ensuring timely action to prevent device damage. Furthermore, transistor Q1, as a switching element, effectively controls the operating state of the LED, reducing power consumption and extending its lifespan. Furthermore, the introduction of capacitor C5 helps filter out high-frequency noise, ensuring stable LED illumination and reducing the possibility of false alarms. Overall, the indicator module 700 not only improves system operability but also enhances safety, allowing users to better monitor the device's status during operation.

[0071] According to the above-described embodiments, the integrated circuit chip over-temperature protection circuit of the present application significantly improves over-temperature protection performance through the coordinated operation of multiple modules. The comparison module monitors the temperature signal in real time and quickly disconnects the power supply circuit once the temperature exceeds a set threshold, effectively protecting the integrated circuit from overheating. Furthermore, the use of a three-wire PT100 temperature sensor improves measurement accuracy, eliminates interference from lead resistance, simplifies circuit design, and reduces costs. Regarding signal processing, the operational amplifier in the constant current source module optimizes the stability of the current output, ensuring accurate temperature signal acquisition. The filter module effectively filters out high-frequency noise and improves signal clarity, while the amplification module enhances signal detectability and improves temperature monitoring sensitivity. Furthermore, the reference voltage module provides a stable reference voltage, further improving the accuracy of the comparison module and ensuring system reliability under various operating conditions. The indicator light system provides intuitive circuit status feedback, allowing operators to quickly identify over-temperature conditions, enhancing ease of use and safety. Overall, this over-temperature protection circuit establishes an efficient and reliable temperature monitoring and protection system, improving the safety of integrated circuits and user experience.

[0072] The above is only a specific implementation of the present application. Any other improvements made based on the concept of the present application are considered to be within the scope of protection of the present application.

Claims

1. An over-temperature protection circuit for an integrated circuit chip, characterized in that: The circuit comprises: A constant current source module is connected to the temperature sampling module and is used to provide a constant current to the temperature sampling module; A temperature sampling module includes a temperature sensor and a temperature operational amplifier, wherein the output end of the temperature sensor is connected to the positive input end of the temperature operational amplifier, and is used to convert the temperature signal collected by the temperature sensor into a voltage signal; A filtering module, connected to the output end of the temperature operational amplifier, for filtering out high-frequency noise; an amplifying module, connected to the output end of the filtering module, for amplifying the voltage signal and outputting the amplified voltage signal to the comparing module; A reference voltage module is connected to the power supply and is used to provide a reference voltage for the comparison module; a comparison module, connected to the output end of the amplification module and the output end of the reference voltage module, and configured to compare the amplified voltage with the reference voltage; The indicator light prompt module is connected to the comparison module and is used to light up a prompt when the amplified voltage signal exceeds the reference voltage.

2. The over-temperature protection circuit for an integrated circuit chip according to claim 1, wherein: The constant current source module includes a reference voltage source U7 and an operational amplifier U1, one end of the reference voltage source U7 is connected to an external power supply through a resistor R8, and the other end is grounded; The positive input terminal of the operational amplifier U1 is connected between the reference voltage source U7 and the resistor R8 through the resistor R7, the negative input terminal of the operational amplifier U1 is grounded through the resistor R6, and the output terminal of the operational amplifier U1 is connected to the temperature sampling module through the resistor R11, and is connected to the negative input terminal of the operational amplifier U1 through the resistor R10.

3. The over-temperature protection circuit for an integrated circuit chip according to claim 2, wherein: The constant current source module further includes an operational amplifier U2, the positive input of which is connected to the output of the operational amplifier U1 via a resistor R11, and the output of which is connected between the resistor R7 and the positive input of the operational amplifier U1 via a resistor R9.

4. The over-temperature protection circuit for an integrated circuit chip according to claim 2, wherein: One end of the temperature sensor is grounded via a resistor R1, and the other end is connected to the output end of the operational amplifier U1 via a resistor R2 and a resistor R11 connected in series; The positive input terminal of the temperature operational amplifier is connected between the temperature sensor and the resistor R2 through the resistor R3, the negative input terminal of the temperature operational amplifier is connected between the resistor R2 and the resistor R11 through the resistor R4, and the output terminal of the temperature operational amplifier is connected to the negative input terminal of the temperature operational amplifier through the resistor R5.

5. The over-temperature protection circuit for an integrated circuit chip according to claim 1, wherein: The filtering module includes an operational amplifier U4, the positive input terminal of the operational amplifier U4 is connected to the output terminal of the temperature operational amplifier through a resistor R13 and a resistor R12 connected in series, and the positive input terminal of the operational amplifier U4 is also grounded through a capacitor C2; the negative input terminal of the operational amplifier U4 is grounded through a resistor R14; the output terminal of the operational amplifier U4 is connected to the negative input terminal of the operational amplifier U4 through a resistor R15, and the output terminal of the operational amplifier U4 is also connected between the resistor R12 and the resistor R13 through a resistor C1.

6. The over-temperature protection circuit for an integrated circuit chip according to claim 5, wherein: The amplification module includes an operational amplifier U5, the positive input terminal of the operational amplifier U5 is connected to the output terminal of the operational amplifier U4 through a resistor R18, and the positive input terminal of the operational amplifier U5 is also grounded through a resistor R18 and a resistor R16 connected in series; the negative input terminal of the operational amplifier U5 is grounded through a resistor R17; and the output terminal of the operational amplifier U5 is connected to the negative input terminal of the operational amplifier U5 through a resistor R19.

7. The over-temperature protection circuit for an integrated circuit chip according to claim 1, wherein: The reference voltage module includes a reference power supply chip U8, the input end of which is connected to the power supply, and the output end is grounded through a resistor R21 and a resistor R22 connected in series. The output end of the reference power supply chip U8 is also grounded through a capacitor C4.

8. The over-temperature protection circuit for an integrated circuit chip according to claim 7, wherein: The comparison module includes an operational amplifier U6, the positive input of the operational amplifier U6 is connected to the output of the reference power supply chip U8; the negative input of the operational amplifier U6 is connected to the output of the operational amplifier U5, and the negative input of the operational amplifier U6 is also grounded through a resistor R20; the output of the operational amplifier U6 is connected to the indicator light prompt module.

9. The over-temperature protection circuit for an integrated circuit chip according to claim 8, wherein: The output end of the operational amplifier U6 is also connected to an external power supply through a relay S1.

10. The over-temperature protection circuit for an integrated circuit chip according to claim 8, wherein: The indicator light prompt module includes an LED lamp and a transistor Q1. The base of the transistor Q1 is connected to the output end of the operational amplifier U6. The collector of the transistor Q1 is grounded through the LED lamp and the resistor R24 connected in series; the cathode of the LED lamp is also grounded through the capacitor C5.

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