This non-provisional application claims priority under 35 U.S.C. § 119(a) on Patent Application No(s). 094132137 filed in Taiwan, R.O.C. on Sep. 16, 2005, the entire contents of which are hereby incorporated by reference.
1. Field of Invention
The present invention relates to an overheated protection circuitry for central processing unit (CPU), and more particularly, to an overheated protection circuitry capable of switching off a power supply when the working temperature of a CPU is higher Man a preset temperature.
2. Related Art
In the convention, when a CPU is overheated, a power supply of the CPU will be switched off This overheated protection mechanism can be divided into two stages. In the first stage, when the temperature of the CPU reaches to a first preset temperature (usually set 100° C.), the first overheated protection mechanism is activated. Net, when the temperature of the CPU reaches to a second preset temperature (usually set 125° C.), the second overheated protection mechanism is activated, wherein the first preset temperature is lower than the second preset temperature. As shown in
The above-mentioned overheated protection mechanisms may switch off the power supply to avoid the CPU being damaged according to overheated temperature; however, if the micro processor or the chipset is breakdown, the function of the overheated protection mechanisms is stopped due to crash, or a void in the solder joint of the connection pin of the CPU or the chipset, the power supply can't not be switched off. In this situation, the CPU will be overheated and then the body of the CPU may be burnt or melted, which cause a safety problem. Therefore, how to switch off the power supply when the processor or the chipset is breakdown becomes an import issue.
In view of the above, it is an object of the present invention to provide an overheated protection circuitry for solving the problems that the CPU is damage due to be overheated because the elements used for sending out a signal to switch off a power supply are break down and the elements used for sending out a signal to switch off a power supply have manufacturing defects led to the elements are unable to execute the action of switching off the power supply.
To achieve the object, an overheated protection circuitry for CPU is provided. The overheated protection circuitry for CPU is used to switch off the power supply of the CPU when the working temperature of the CPU is higher than a first preset temperature or a second preset temperature. When the working temperature of the CPU is higher than the second preset temperature, the CPU sends out a first abnormal signal. The first abnormal signal is processed by a chipset and then a first switch-off signal is generated and sent. The power supply is switched off after receiving the first switch-off signal.
The overheated protection circuitry for a CPU of the present invention comprises a thermal module, a control module, and a signal processing module. The thermal module is used for detecting the working temperature of the CPU and sends out the second abnormal signal to the control module when the working temperature of the CPU is higher than the first preset temperature. In addition, the control module sends out a second switch-off signal when receiving one of the first and second abnormal signals. The power supply will be switched off when receiving the first switchoff signal or the second switch-off signal.
Moreover, the control module comprises a first determining circuit, a second determining circuit, and a signal conversion module. The first and second determining circuits are used to receive a first and a second abnormal signal respectively. Then a first and a second determining signal are outputted to the signal conversion module after the first and second abnormal signals are processed by level adjusting and signal determining. The signal conversion module outputs the second switch-off signal to the signal processing module to perform an action of switching off the power supply after receiving one of the first and second determining signals.
In addition, the control module comprises a voltage level adjusting circuit and relative circuits. The voltage level adjusting circuit is used for receiving the first abnormal signal and adjusting the level of the first abnormal signal to be the same with that of the second abnormal signal so as to connect with the second abnormal signal to generate the second switch-off signal. The second switch-off signal is provided to the signal processing module for performing an action of switching off the power supply. Moreover, the overheated protection circuitry for a CPU of the present invention further comprises a micro processor and a chipset. The micro processor synchronously receives the thermal signal corresponding to the working temperature of the CPU from the thermal module. In addition, the micro processor sends out a third abnormal signal when the working temperature of the CPU is higher than the first preset temperature. Then the chipset sends out the first switch-off signal when receiving one of the first and third abnormal signals to the signal processing module to perform the action of switching off the power supply.
The overheated protection circuitry for a CPU of the present invention has following advantages and effect:
The present invention is an overheated protection circuitry for CPU, which provides dual overheated protection mechanism. Moreover, because the overheated protection mechanism is not like the conventional one only utilizing micro processor or chipset for sending signals, the control module of the present invention also can synchronously receive the abnormal signals of temperature to perform the action of switching off the power supply; therefore, the present invention can ensure a CPU not being breakdown or damaged due to overheating.
The features and practice of the preferred embodiments of the present invention will be illustrated below in detail with reference to the drawings.
Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
The present invention will become more fully understood from the detailed description given herein below for illustration only, and which thus is not limitative of the present invention, and wherein:
The contents of the present invention are described in details through specific embodiments with reference to the figures. The reference numerals mentioned in the specification correspond to equivalent reference numerals in the figures.
As shown in
The overheated protection circuitry 10 for a CPU of the present invention comprises a thermal module 13, a control module 14, and a signal processing module 15. The thermal module 13 is connected with the thermal sensor of the CPU 11 for detecting the working temperature of the CPU 11. The CPU 11 generates the first abnormal signal to the control module 14 when the working temperature of the CPU 11 is higher than the first preset temperature.
In addition, the control module 14 is connected with the CPU 11 and the thermal module 13, and the thermal module 13 sends out a second abnormal signal when the working temperature of the CPU 11 is higher than the first preset temperature; therefore, the control module 14 is used to receive the first and second abnormal signals, and when receives one of the first and second abnormal signals, the control module 14 sends out a second switch-off signal to the signal processing module 15. The signal processing module 15 switches off the power supply 12 when receiving the first switch-off signal or the second switch-off signal. The above-mentioned first and second abnormal signals may be a level signal in practice. In other word, when the working temperature of CPU is normal, the abnormal signal is a low level signal, for instance 0V. On the other hand, when the working temperature of CPU is abnormal, the abnormal signal is a high level signal, for instance 3.3V or 1V. Therefore, the control module 14 determines the level of the received first and second abnormal signals. If one of the first and second abnormal signals is in high level, the control module 14 generates the second switch-off signal provided to the signal processing module 15. The signal processing module 15 may an OR gate. If one of the first and second switch-off signals is in high level, the power supply switches off
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The present invention being thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims.
Number | Date | Country | Kind |
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094132137 | Sep 2005 | TW | national |