CN1952838A - Overheat indicating circuit for mainboard - Google Patents

Abstract

This invention relates to main board overheat indication circuit, which comprises one function chip and one temperature control chip connected with function chip, wherein, the said main board also comprises one switch circuit and one light diode; the said switch circuit input end connects the said temperature control chip to receive one impose signals; the said switch circuit output end is connected with one first high level and its light diode cathode; the said light diode anode is connected to one second high level.

Description

Motherboard overheating indicator circuit

【Technical field】

The invention relates to an indicating circuit, in particular to an indicating circuit which can indicate a computer failure caused by overheating of a main board.

【Background technique】

During the use of the computer, the computer often crashes. When it crashes, the performance is mostly a blue screen on the display, the system cannot be started, the screen freezes and does not respond, the mouse and keyboard cannot input, and the software is interrupted abnormally, which annoys the operator. There are many reasons for the computer to crash, such as poor heat dissipation, equipment mismatch, hard disk failure, virus infection, system file damage or deletion, illegal operation and so on. When the computer crashes, the user usually cannot judge what kind of reason is causing it, resulting in frequent crashes, but cannot make corresponding countermeasures in time for different crashes to improve the operating status of the computer.

With the rapid development of computer technology, the running speed of computers has been greatly improved. Correspondingly, the heat generated inside the computer is much higher than before. If the cooling system of the computer cannot dissipate the heat in time, it will cause the computer Crash or even shut down automatically. At this time, if there is no clear instruction that the crash or shutdown is caused by the overheating of the computer motherboard, the user can only deal with it according to the usual procedures, and eliminate the possible causes in turn. This not only wastes the valuable time of the user, but also brings unnecessary troubles to the processing process.

【Content of invention】

In view of the above, it is necessary to provide an indicating circuit that can indicate that the motherboard is overheated and causes a computer failure.

A motherboard overheating indicator circuit, which includes a functional chip and a temperature control chip connected to the functional chip, the motherboard overheating indicator circuit also includes a switch circuit and a light emitting diode, the input of the switch circuit is connected to The temperature control chip receives a pulse signal from it, the output terminal of the switch circuit is connected to a first high level and the cathode of the light emitting diode at the same time, and the anode of the light emitting diode is connected to a second high level flat.

Compared with the prior art, the overheating indicating circuit of the motherboard of the present invention adds a switch circuit that controls the light-emitting diodes to emit light alternately. When the system shuts down due to overheating, the temperature control chip controls the switch circuit to be turned off or on. Thereby controlling the light-emitting diode to go out or light up, to remind the user where the computer failure is.

【Description of drawings】

The utility model will be further described below in conjunction with the embodiments with reference to the accompanying drawings.

Fig. 1 is a block diagram of the working principle of a preferred embodiment of the main board overheating indicating circuit of the present invention.

FIG. 2 is a specific circuit diagram of the switch circuit in FIG. 1 .

Fig. 3 is a connection circuit diagram of the connector and the LED in Fig. 1 .

FIG. 4 is a specific circuit diagram of another preferred embodiment of the switch circuit in FIG. 1 .

【Detailed ways】

Please refer to Fig. 1 to Fig. 3, the preferred embodiment of the mainboard overheating indicating circuit of the present utility model comprises a central processing unit (CPU) chip 10 that is located on the mainboard, a temperature monitoring chip 20, a switch circuit 30, a connector 50 and a light emitting diode (LED) 60 connected to the connector 50 .

The temperature control chip 20 is connected to the temperature control pin of the CPU chip 10. When the temperature of the CPU is higher than the limit temperature set by the system, the computer system crashes or automatically shuts down. At this time, the CPU chip 10 sends a signal to the temperature control chip 20 . After receiving the signal, the temperature control chip 20 generates a pulse signal from the pin PWRLED and sends it to the input terminal of the switch circuit 30 .

The switch circuit 30 includes a switch device 31, a first preferred embodiment of the switch device 31 is a PNP transistor, a first transistor is connected between the base of the transistor 31 and the input end of the switch circuit 30 A resistor R1, the emitter of the triode 31 is grounded, the collector is connected to a +5V power supply through a second resistor R2, and is connected to the pin 4 of the connector 50 at the same time.

The pin 2 of the connector 50 is connected to a +5V power supply through a second resistor R2 , the anode of the LED 60 is connected to the pin 2 , and the cathode is connected to the pin 4 of the connector 50 .

In this embodiment, the connection head 50 is provided for the convenience of connecting the light emitting diode 60 with the computer main board. The anode of the LED 60 can be directly connected to the +5V power supply through the third resistor R3 , and the cathode can be directly connected to the output terminal of the switch circuit 30 , that is, the collector of the PNP transistor 31 .

When the temperature of the CPU is higher than the limit temperature set by the system, the temperature control chip 20 sends a pulse signal with alternating high and low levels to the input end of the switch circuit 30, when the pulse signal is high level, The PNP transistor 31 is cut off, and at this time the anode and cathode of the diode 60 are both connected to the +5V high level, so the diode is cut off and does not emit light; when the pulse signal is low, the PNP Type triode 31 conducts and sends the low level to the pin 4 of the connector, that is, the cathode of the diode 60. At this time, the anode and cathode of the diode 60 are turned on to emit light due to a forward voltage drop . The high and low levels generated by the temperature control chip 20 appear alternately, so the diode 60 also produces alternately on and off light, thereby reminding the user that the computer failure is caused by the overheating of the motherboard.

Fig. 4 is the second preferred embodiment of the switching circuit, which differs from the first preferred embodiment in that: the switching device 31' is a P-channel enhanced field effect transistor, and the field effect transistor 31 The gate of 'is connected to the output terminal of the temperature control chip 20, the drain of the field effect transistor 31' is grounded, the source is connected to a +5V power supply through a second resistor R2, and connected to the connector Pin 4 of 50. Its working principle is the same as that of the first preferred embodiment.

Wherein, in the above embodiment, the CPU chip 10 may be other chips with similar functions.

Claims (8)

1. A motherboard overheating indicating circuit, which includes a functional chip and a temperature control chip connected to the functional chip, characterized in that: the motherboard overheating indicating circuit also includes a switch circuit and a light emitting diode, the switch The input end of the circuit is connected to the temperature control chip and receives a pulse signal therefrom, the output end of the switch circuit is connected to a first high level and the cathode of the light emitting diode at the same time, and the anode of the light emitting diode is connected to at a second high level. 2. The motherboard overheating indicator circuit according to claim 1, characterized in that: the motherboard overheating indicator circuit further comprises a connector, the connector includes a first pin and a second pin, the first pin A pin is connected to the first high level, and the second pin is connected to the output end of the switch circuit and the second high level at the same time. 3. The motherboard overheating indicator circuit according to claim 2, wherein the anode of the light emitting diode is connected to the first pin of the connector, and the cathode of the light emitting diode is connected to the first pin of the connector. Two pins. 4. The motherboard overheating indicator circuit according to claim 1, wherein the switch circuit includes a PNP transistor, the output terminal of the temperature control chip is connected to the base of the PNP transistor, and the PNP The emitter of the triode is grounded, and the collector is connected to the cathode of the LED. 5. The motherboard overheating indicator circuit according to claim 4, wherein the switch circuit further comprises a first resistor connected in series between the output terminal of the temperature control chip and the base of the PNP transistor. 6. The motherboard overheating indicator circuit according to claim 1, wherein the switch circuit includes a P-channel enhanced field effect transistor, and the output terminal of the temperature control chip is connected to the P-channel enhanced field effect transistor. The gate of the field effect transistor, the drain of the P-channel enhanced field effect transistor is grounded, and the source is connected to the cathode of the light emitting diode. 7. The motherboard overheating indicator circuit according to claim 1, characterized in that: a second resistor is provided between the output terminal of the switch circuit and the first high level, and the anode of the light emitting diode is connected to the A third resistor is provided between the second high level. 8. The motherboard overheating indicator circuit according to claim 1, wherein when the temperature of the functional chip is higher than the temperature set by the computer system, the output terminal of the temperature control chip generates the pulse signal.

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