CN1952838B - Motherboard overheating indicator circuit - Google Patents

Abstract

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; when the temperature of the functional chip exceeds the temperature set by the system, the temperature control chip sends high and low pulse signals to control the switch circuit to be turned on or off, thereby controlling the light-emitting diode to produce alternately on and off light-emitting phenomena.

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 indicating circuit, which includes a functional chip arranged on the motherboard and a temperature control chip connected to the functional chip, the motherboard overheating indicating circuit also includes a switch circuit and a light emitting diode, the switch circuit The input end of the switch 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 A second high level.

Preferably, the motherboard overheating indicator circuit further includes a connector, the connector includes a first pin and a second pin, the first pin is connected to the first high level, the The second pin is connected to the output end of the switch circuit and the second high level at the same time.

Preferably, the anode of the LED is connected to the first pin of the connector, and the cathode of the LED is connected to the second pin of the connector.

Preferably, the switch circuit includes a PNP transistor, the output terminal of the temperature control chip is connected to the base of the PNP transistor, the emitter of the PNP transistor is grounded, and the collector is connected to the light emitting diode of the cathode.

Preferably, the switch circuit further includes a first resistor connected in series between the output terminal of the temperature control chip and the base of the PNP transistor.

Preferably, the switch circuit includes a P-channel enhanced field effect transistor, the output terminal of the temperature control chip is connected to the gate of the P-channel enhanced field effect transistor, and the P-channel enhanced field effect transistor The drain of the effect transistor is grounded, and the source is connected to the cathode of the light emitting diode.

Preferably, a second resistor is provided between the output terminal of the switch circuit and the first high level, and a third resistor is provided between the anode of the light emitting diode and the second high level.

Preferably, 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.

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. The light-emitting diode goes out or lights up to alert the user where the computer is malfunctioning.

【Description of drawings】

The present invention will be further described below with reference to the accompanying drawings and embodiments.

Fig. 1 is a block diagram of the working principle of a preferred embodiment of the motherboard 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 mainboard overheating indication circuit of the present invention comprises a central processing unit (CPU) chip 10 that is located on 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 transmits 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 the 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 at a low level, 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. overheat indicating circuit for mainboard; It comprises that a functional chip and that is arranged on the mainboard is connected to the temperature control chip of said functional chip; It is characterized in that: said overheat indicating circuit for mainboard also comprises an on-off circuit and a light emitting diode; The input end of said on-off circuit is connected to said temperature control chip and replaces the pulse signal that occurs from wherein receiving a high-low level; The output terminal of said on-off circuit is connected in the negative electrode of one first high level and said light emitting diode simultaneously, and the anode of said light emitting diode is connected in one second high level.

2. overheat indicating circuit for mainboard as claimed in claim 1; It is characterized in that: said overheat indicating circuit for mainboard also comprises a connector; Said connector comprises one first pin and one second pin; Said first pin is connected to said second high level, and said second pin is connected to the output terminal and said first high level of said on-off circuit simultaneously.

3. overheat indicating circuit for mainboard as claimed in claim 2 is characterized in that: the anode of said light emitting diode is connected to first pin of said connector, and the negative electrode of said light emitting diode is connected to second pin of said connector.

4. overheat indicating circuit for mainboard as claimed in claim 1; It is characterized in that: said on-off circuit comprises a positive-negative-positive triode; The output terminal of said temperature control chip is connected to the base stage of said positive-negative-positive triode; The grounded emitter of said positive-negative-positive triode, collector are connected to the negative electrode of said light emitting diode.

5. overheat indicating circuit for mainboard as claimed in claim 4 is characterized in that: said on-off circuit comprises that also one is series at first resistance between said temperature control chip output terminal and the said positive-negative-positive transistor base.

6. overheat indicating circuit for mainboard as claimed in claim 1; It is characterized in that: said on-off circuit comprises a P-channel enhancement type FET; The output terminal of said temperature control chip is connected to the grid of said P-channel enhancement type FET; The grounded drain of said P-channel enhancement type FET, source electrode are connected to the negative electrode of said light emitting diode.

7. overheat indicating circuit for mainboard as claimed in claim 1 is characterized in that: be provided with one second resistance between the output terminal of said on-off circuit and said first high level, be provided with one the 3rd resistance between the anode of said light emitting diode and said second high level.

8. overheat indicating circuit for mainboard as claimed in claim 1 is characterized in that: when the temperature of said functional chip exceeded the temperature of computer system setting, the output terminal of said temperature control chip produced said pulse signal.

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