CN203909781U - CPU (Central Processor Unit) protection circuit - Google Patents
CPU (Central Processor Unit) protection circuit Download PDFInfo
- Publication number
- CN203909781U CN203909781U CN201420161460.8U CN201420161460U CN203909781U CN 203909781 U CN203909781 U CN 203909781U CN 201420161460 U CN201420161460 U CN 201420161460U CN 203909781 U CN203909781 U CN 203909781U
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- electrically connected
- cpu
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- circuit
- power supply
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Abstract
The utility model relates to a CPU (Central Processor Unit) protection circuit, which is applied to a CPU circuit test, is powered by a power supply module, and is electrically connected with a main board power supply circuit. The CPU protection circuit comprises a signal feedback module electrically connected with the main board power supply circuit, and a switching module electrically connected with the signal feedback module, wherein the switching module is electrically connected with the power supply module. When the current of the main board power supply circuit becomes large, the power supply module is turned off by the switching module. According to the CPU protection circuit provided by the utility model, if the main board power supply circuit is short-circuited or the current is too large, then the current of the signal feedback module increases, the voltage of the connecting end of the switching module and the power supply model decreases, and the power supply model is turned off; the CPU protection circuit can determine the abnormity of the circuit and automatically turn off the power supply module, thus effectively preventing a CPU from being burned out.
Description
Technical field
The utility model relates to a kind of CPU holding circuit, particularly relates to a kind of CPU holding circuit being applied in cpu test.
Background technology
When mainboard is produced, because needs are tested with CPU, ATX power supply is to main board power supply, the voltage transitions that on mainboard, line related circuit is supplied with ATX power supply becomes the voltage that CPU is suitable, thereby allow CPU normally work, yet can to cause the circuit of main board power supply to produce abnormal because of problems such as the processing procedure of feed circuit of mainboard and assemblies, when circuit produces overtension or electric current will burn out CPU when excessive.
In view of this, the problem that the CPU that is in fact necessary to provide a kind of CPU holding circuit, this CPU holding circuit to solve to exist in above-mentioned technology is burned.
Summary of the invention
Therefore, the purpose of this utility model is to provide a kind of CPU holding circuit, and this CPU holding circuit can solve the problem that above-mentioned CPU is burned.
To achieve the above object, CPU holding circuit of the present utility model, it is applied in cpu circuit test, and a power module provides power supply for this cpu circuit, this cpu circuit and feed circuit of mainboard electric connection, this CPU holding circuit comprises:
Signal feedback module, this signal feedback module and described feed circuit of mainboard are electrically connected; And
Switch module, this switch module and described signal feedback module are electrically connected, and this switch module and the electric connection of described power module, and when the electric current of described feed circuit of mainboard becomes large, switch module is closed described power module.
Preferably, described switch module comprises:
Metal-oxide-semiconductor, the source electrode of this metal-oxide-semiconductor and described power module are electrically connected, and drain electrode and the electric connection of described power module; And
Resistance, the grid of this resistance and described metal-oxide-semiconductor is electrically connected.
Preferably, described metal-oxide-semiconductor is NMOS pipe.
Preferably, described signal feedback module comprises:
Diode, this diode and described resistance are in parallel, and the negative pole of this diode and the electric connection of described resistance one end;
Acquisition chip, the negative pole of this acquisition chip and described diode is electrically connected, and this acquisition chip and the electric connection of described power module;
The first electric capacity, this first electric capacity one end and described diode cathode are electrically connected, and the other end is electrically connected with ground;
The second electric capacity, this second electric capacity one end and described feed circuit of mainboard are electrically connected, and the other end is electrically connected with ground; And
Coil, this coil one end and described diode cathode are electrically connected, and the other end and described feed circuit of mainboard are electrically connected.
Preferably, the model of described acquisition chip is AD7872.
Preferably, described coil is 100NH inductance.
Compared to prior art, CPU holding circuit of the present utility model, by a signal feedback module and a switch module are set, and this signal feedback module and this switch module are electrically connected, in addition, this switch module and a power module are electrically connected, described signal feedback module and a mainboard supply circuit are electrically connected again, this mainboard supply circuit and a cpu circuit are electrically connected, when opening described power module, if mainboard supply circuit have short circuit or electric current excessive, the electric current of described signal feedback module increases, the lower voltage that described switch module is connected with described power module and holds, described power module is closed, this CPU holding circuit can decision circuitry extremely also be closed described power module automatically, thereby effectively protected CPU not to be burned.
[accompanying drawing explanation]
Fig. 1 illustrates the structural representation of the utility model CPU holding circuit.
Fig. 2 illustrates the circuit diagram of the utility model CPU holding circuit.
[embodiment]
Refer to Fig. 1 and Fig. 2, it is respectively the structural representation of the utility model CPU holding circuit and the circuit diagram of the utility model CPU holding circuit.
CPU holding circuit of the present utility model, it is applied in cpu circuit 1 test, and a power module 2 provides power supply for this cpu circuit 1, and this cpu circuit 1 and feed circuit of mainboard 3 electric connections, in the present embodiment, refer to Fig. 1, and this CPU holding circuit comprises:
Signal feedback module 4, this signal feedback module 4 is electrically connected with described feed circuit of mainboard 3; And
Switch module 5, this switch module 5 is electrically connected with described signal feedback module 4, and this switch module 5 and described power module 2 electric connections, and when the electric current of described feed circuit of mainboard 3 becomes large, switch module 5 is closed described power module 2.
In the present embodiment, refer to Fig. 2, described switch module 5 comprises:
Metal-oxide-semiconductor M, the source S of this metal-oxide-semiconductor M and described power module 2 are electrically connected, and drain D and 2 electric connections of described power module, and in the present embodiment, this metal-oxide-semiconductor M is NMOS pipe; And
Resistance R, the grid G of this resistance R and described metal-oxide-semiconductor M is electrically connected.
In the present embodiment, described signal feedback module 4 comprises:
Diode D2, this diode D2 and described resistance R are in parallel, and the negative pole of this diode D2 and the electric connection of described resistance R one end;
Acquisition chip Q, the negative pole of this acquisition chip Q and described diode D2 is electrically connected, and this acquisition chip Q and described power module 2 are electrically connected, in the present embodiment, the model of this acquisition chip Q is AD7872, and wherein, 5 pin of AD7872,6 pin, 7 pin and 8 pin are connected, 1 pin, 2 pin and 3 pin are connected, and 4 pin and grid G are electrically connected;
The first capacitor C 1, this first capacitor C 1 one end and described diode D2 negative pole are electrically connected, and the other end is electrically connected with ground, and this first capacitor C 1 is for the protection of circuit;
The second capacitor C 2, these the second capacitor C 2 one end and described feed circuit of mainboard 3 are electrically connected, and the other end is electrically connected with ground, and this second capacitor C 2 is for the protection of circuit; And
Coil L, this coil L one end and described diode D2 negative pole are electrically connected, and the other end and described feed circuit of mainboard 3 are electrically connected, and in the present embodiment, this coil L is 100NH inductance.
In the present embodiment, refer to Fig. 1 and Fig. 2, because being provided with signal feedback module 4 and switch module 5, and this signal feedback module 4 is electrically connected with this switch module 5, in addition, this switch module 5 is electrically connected with power module 2, described signal feedback module 4 is electrically connected with mainboard supply circuit again, when opening described power module 2, power module 2 will be exported 5V and 12V voltage, if feed circuit of mainboard 3 short circuits, the electric current in circuit will become large moment, it is large that resistance R both end voltage becomes, and the grid G voltage decreases of described metal-oxide-semiconductor M, cause the grid G voltage of metal-oxide-semiconductor M to be less than the voltage of source S, metal-oxide-semiconductor M cut-off, described power module 2 will be closed, if the electric current in feed circuit of mainboard 3 is excessive, the same, the voltage at resistance R two ends can increase, and the grid G voltage of metal-oxide-semiconductor M will reduce, when the voltage of grid G is less than the voltage of source S, metal-oxide-semiconductor M cut-off, described power module 2 will be closed, thereby effectively protected CPU in cpu circuit 1.
Compared to prior art; CPU holding circuit of the present utility model; if mainboard supply circuit have short circuit or electric current excessive; the electric current of described signal feedback module 4 will increase; described switch module 5 be connected with described power module 2 end voltage will reduce; described power module 2 is closed, and this CPU holding circuit can decision circuitry extremely also be closed described power module 2 automatically, thereby has effectively protected CPU not burnt.
Claims (6)
1. a CPU holding circuit, it is applied in cpu circuit test, and a power module provides power supply for this cpu circuit, and this cpu circuit and feed circuit of mainboard electric connection, is characterized in that, and this CPU holding circuit comprises:
Signal feedback module, this signal feedback module and described feed circuit of mainboard are electrically connected; And
Switch module, this switch module and described signal feedback module are electrically connected, and this switch module and the electric connection of described power module, and when the electric current of described feed circuit of mainboard becomes large, switch module is closed described power module.
2. CPU holding circuit according to claim 1, is characterized in that, described switch module comprises:
Metal-oxide-semiconductor, the source electrode of this metal-oxide-semiconductor and described power module are electrically connected, and drain electrode and the electric connection of described power module; And
Resistance, the grid of this resistance and described metal-oxide-semiconductor is electrically connected.
3. CPU holding circuit according to claim 2, is characterized in that, described metal-oxide-semiconductor is NMOS pipe.
4. CPU holding circuit according to claim 2, is characterized in that, described signal feedback module comprises:
Diode, this diode and described resistance are in parallel, and the negative pole of this diode and the electric connection of described resistance one end;
Acquisition chip, the negative pole of this acquisition chip and described diode is electrically connected, and this acquisition chip and the electric connection of described power module;
The first electric capacity, this first electric capacity one end and described diode cathode are electrically connected, and the other end is electrically connected with ground;
The second electric capacity, this second electric capacity one end and described feed circuit of mainboard are electrically connected, and the other end is electrically connected with ground; And
Coil, this coil one end and described diode cathode are electrically connected, and the other end and described feed circuit of mainboard are electrically connected.
5. CPU holding circuit according to claim 4, is characterized in that, the model of described acquisition chip is AD7872.
6. CPU holding circuit according to claim 4, is characterized in that, described coil is 100NH inductance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420161460.8U CN203909781U (en) | 2014-04-03 | 2014-04-03 | CPU (Central Processor Unit) protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420161460.8U CN203909781U (en) | 2014-04-03 | 2014-04-03 | CPU (Central Processor Unit) protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203909781U true CN203909781U (en) | 2014-10-29 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420161460.8U Expired - Fee Related CN203909781U (en) | 2014-04-03 | 2014-04-03 | CPU (Central Processor Unit) protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203909781U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107918380A (en) * | 2017-11-30 | 2018-04-17 | 惠州市蓝微新源技术有限公司 | A kind of control circuit of MCU break-makes |
-
2014
- 2014-04-03 CN CN201420161460.8U patent/CN203909781U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107918380A (en) * | 2017-11-30 | 2018-04-17 | 惠州市蓝微新源技术有限公司 | A kind of control circuit of MCU break-makes |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141029 Termination date: 20160403 |
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| CF01 | Termination of patent right due to non-payment of annual fee |