CN2886892Y - Protection circuit for power supply - Google Patents
Protection circuit for power supply Download PDFInfo
- Publication number
- CN2886892Y CN2886892Y CN 200520067945 CN200520067945U CN2886892Y CN 2886892 Y CN2886892 Y CN 2886892Y CN 200520067945 CN200520067945 CN 200520067945 CN 200520067945 U CN200520067945 U CN 200520067945U CN 2886892 Y CN2886892 Y CN 2886892Y
- Authority
- CN
- China
- Prior art keywords
- power supply
- circuit
- effect transistor
- field effect
- protection circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
A power supply holding circuit connected to a power source comprises a cut-in circuit controlling the power supply from the power source to a circuit board, an observation circuit, a switch element connected with the observation circuit from one end and connected with the power source from another end to connect the cut-in circuit and the power source. One end of the observation circuit connects a component of the circuit board to observant the status of the component, another end of the observation circuit connects a switch element to control the switch element on or off by the status of the component.
Description
[technical field]
The utility model is about a kind of power supply protection circuit, especially a kind of by the assembly situation on the testing circuit plate protective circuit of protective circuit plate.
[background technology]
Along with consuming components on the computer main board, for example central processing unit, display card chip, the lifting of running frequency, its power consumption is more and more higher, therefore computer power provides and has been the plug of these assembly power supplies specially, make power supply increase for the power cable quantity of mainboard, and the distribution of different sockets on mainboard of these cable correspondences also disperse.
DIY (Do it yourself) is popular day by day at present, user's trend towards doing it yourself some minor issues of settlement computer more, for example inserting element or cleaning central processing unit fan etc. on mainboard when carrying out these operations, are operated and security consideration for convenience, the user tends to the power cable of electric power connecting on mainboard pulled out, after treating that operation is finished, again these cables are plugged, but because cable is numerous, and it is scattered to distribute, and the user usually misses one or several power cable.In this case, after user's start, often some assembly can't not worked because of there being power supply in the computer system, is easy to cause the damage of some assembly in the computer system like this.
And the user is after operating mainboard, forget sometimes some assemblies (as display card) are plugged on the mainboard, after user's start, other assembly meeting normal power-up in the computer system, but owing to lack necessary assembly on the mainboard, system can't operate as normal, so also is easy to cause the damage of some element in the computer system.
[summary of the invention]
In view of above content, be necessary to provide a kind of circuit board power supply protection circuit.
A kind of power supply protection circuit; it connects a power supply; this power supply protection circuit comprises open circuit, an observation circuit, the switch element of this power supply of control to circuit board power supply; one end of this switch element is connected with this open circuit; the other end links to each other with this power supply and is connected this open circuit and this power supply; one end of this observation circuit links to each other with a assembly on this circuit board and monitors the situation of this assembly, the other end be connected in this switch element and according to the conducting of the situation control switch element of assembly with end.
Compare with original technology, the utility model can observation circuit assembly situation on the plate and protective circuit plate in time.
[description of drawings]
Fig. 1 is the circuit diagram of the utility model power supply protection circuit one preferred embodiment.
[embodiment]
In a computer system, power supply is typically provided with a main board power supply plug and central processing unit power supply plug, and correspondence is provided with a main board power supply socket and a central processing unit power supply base on the mainboard, is respectively mainboard and central processing unit provides power supply.See also Fig. 1, a socket 100 is the main board power supply socket, and the main board power supply plug of power supply is plugged on this socket 100 and gives this main board power supply.After the main board power supply plug of power supply is plugged on this socket 100, power supply just the waiting signal 300 of one+5V is delivered to always socket 100+the 5VSB pin, this wait signal 300 is used for providing the start power supply for computer system.
See also Fig. 1, the mainboard that the utility model power supply protection circuit has been missed central processing unit power supply plug with protection is that example describes.This power supply protection circuit comprises an observation circuit 70, an open circuit 50 and a switch element, and this switch element is one first field effect transistor 400 in the present embodiment.
Open circuit 50 links to each other with the source electrode of first field effect transistor 400, and transmit the source electrode of a power supply power supplying control signal 900 to first field effect transistor 400, open circuit 50 comprises one second field effect transistor 500 and one first resistance R 1, waiting signal 300 is delivered to an end of first resistance R 1, the other end of first resistance R 1 is connected to the drain electrode of second field effect transistor 500, the source electrode of first field effect transistor 400 links to each other with the drain electrode of second field effect transistor 500, the source ground of second field effect transistor 500, a start signal 700 is delivered to the grid of second field effect transistor 500.The start control signal that this start signal 700 is sent for north bridge chips, before the start, start signal 700 is a low level, after the start button was pressed, start signal 700 became high level.
Observation circuit 70 links to each other with the grid of first field effect transistor 400, and observation circuit 70 comprises a d type flip flop 200, one second resistance R 2, one the 3rd resistance R 3 and one the 4th resistance R 4.
The truth table of d type flip flop that following table is classified as 200:
" H " expression high level in the last table, " L " represents low level, " X " represents any level,
Expression by low level to high level, Q
0The previous state of expression output Q.
The input end of clock CLK of d type flip flop 200 links to each other with the PWROK pin of socket 100, after power supply is given main board power supply, just produces the normal high level signal of an expression voltage on the PWROK of socket 100 pin.
When the central processing unit of power supply power supply plug is plugged on the central processing unit power supply base of mainboard, and when powering to central processing unit by it, central processing unit voltage signal 800 is a high level, otherwise central processing unit voltage signal 800 is a low level.This central processing unit voltage signal 800 is delivered to the input D of d type flip flop 200 after second resistance R 2 and the 3rd resistance R 3 series connection dividing potential drops.One capacitor C, 1 one end ground connection, an end is connected in the input D of this d type flip flop 200 and protects this d type flip flop 200.The grid of monitor signal 600 to first field effect transistor 400 of the output Q output one reflection central processing unit voltage condition of d type flip flop 200.Waiting signal 300 is delivered to the output Q of this d type flip flop 200 by the 4th resistance R 4.
The drain electrode of first field effect transistor 400 is connected on the PS-ON pin of this socket 100, and this PS-ON pin is a power supply power supply control pin, and when this PS-ON pin was low level, power supply was just given main board power supply; Otherwise power supply is not given main board power supply.
Below introduce the course of work of this power supply protection circuit.
Before the booting computer, the input end of clock CLK of d type flip flop 200 does not have the clock input, and because waiting signal 300 is delivered to the output Q of d type flip flop 200, so the monitor signal 600 of output Q output is a high level, then the grid of first field effect transistor 400 is a high level; This moment, start signal 700 was a low level, and second field effect transistor 500 is ended, and therefore the source electrode of first field effect transistor 400 is a high level, cause the gate source voltage of first field effect transistor 400 less, first field effect transistor 400 is ended, and its drain electrode is unsettled, and promptly the PS-ON pin of socket 100 is unsettled.
After pressing the booting computer button, start signal 700 becomes high level, 500 conductings of second field effect transistor, the drain electrode of second field effect transistor 500 is a low level, the source electrode of switching circuit 50 outputs one low level power supply power supplying control signal 900 to first field effect transistor 400, cause the gate source voltage of first field effect transistor 400 bigger, 400 conductings of first field effect transistor, this low level power supply power supplying control signal 900 is sent to the drain electrode of first field effect transistor 400, then the PS-ON pin of socket 100 is a low level, power supply is given main board power supply, and it is normal to produce an expression voltage at the PWROK of socket 100 pin, high level signal, thus d type flip flop 200 triggered.
If this moment, the central processing unit power supply plug of power supply was not plugged on the central processing unit power supply base of mainboard; then central processing unit voltage signal 800 is a low level; the input D of d type flip flop 200 is a low level; output Q exports the grid of low level monitor signal 600 to first field effect transistor 400; the gate source voltage of first field effect transistor 400 is less; first field effect transistor 400 is ended; this low level power supply power supplying control signal 900 can't be sent to the drain electrode of first field effect transistor 400; the PS-ON pin of socket 100 becomes unsettled; power supply stops to main board power supply, thus the protection mainboard.
If this moment, the central processing unit power supply plug of power supply was plugged on the central processing unit power supply base of mainboard, power supply is powered to central processing unit, central processing unit voltage signal 800 is a high level, the input D of d type flip flop 200 is a high level, output Q exports the grid of monitor signal 600 to first field effect transistor 400 of a high level, and the gate source voltage of first field effect transistor 400 is bigger, 400 conductings of first field effect transistor, the PS-ON pin of socket 100 is a low level, and power supply is given main board power supply.
Therefore slotting if central processing unit power supply plug is leaked, then this protective circuit is cut off the electricity supply automatically to the power supply of mainboard, the protection mainboard.
Whether as seen from the above embodiment, this power supply protection circuit can also be used to protecting the circuit board of Lou having inserted other assembly, for example can peg graft and the circuit board of grafting display card is protected by the monitoring display card.When this power supply protection circuit was used for other device, the condition indicative signal that the central processing unit voltage signal 800 that is adopted is changed to corresponding intrument can be realized.
Claims (10)
1. power supply protection circuit; it connects a power supply; this power supply protection circuit comprises the open circuit of this power supply of control to circuit board power supply; it is characterized in that: this power supply protection circuit also comprises an observation circuit, a switch element; one end of this switch element links to each other with this open circuit; the other end links to each other with this power supply and is connected this open circuit and this power supply; one end of this observation circuit links to each other with a assembly on this circuit board and monitors the situation of this assembly, the other end be connected in this switch element and according to the conducting of the situation control switch element of assembly with end.
2. power supply protection circuit as claimed in claim 1; it is characterized in that: described switch element is a field effect transistor; described open circuit is connected in the source electrode of described field effect transistor, and described observation circuit is connected in the grid of described field effect transistor, and described power supply is connected in the drain electrode of described field effect transistor.
3. power supply protection circuit as claimed in claim 1; it is characterized in that: described open circuit comprises a field effect transistor; the drain electrode of this field effect transistor is set to high level; this switch element links to each other with the drain electrode of this field effect transistor; the source ground of this field effect transistor, grid connect the chip of a control start.
4. power supply protection circuit as claimed in claim 1 is characterized in that: described observation circuit comprises a d type flip flop, and described assembly is connected to the input of this d type flip flop, and the output of this d type flip flop connects this switch element.
5. power supply protection circuit as claimed in claim 4 is characterized in that: described assembly is a central processing unit, and the operating voltage of described central processing unit is connected to the input of this d type flip flop.
6. power supply protection circuit as claimed in claim 4 is characterized in that: the input end of clock of this d type flip flop connects the normal pin of voltage of an expression power supply supply mainboard of a main board power supply socket.
7. power supply protection circuit as claimed in claim 4 is characterized in that: an electric capacity is connected in the input of this d type flip flop and protects this d type flip flop.
8. power supply protection circuit as claimed in claim 4 is characterized in that: the output of this d type flip flop is set to high level.
9. power supply protection circuit as claimed in claim 8 is characterized in that: the output of this d type flip flop connect one by this power supply always the supply circuit plate+5V voltage.
10. power supply protection circuit as claimed in claim 3 is characterized in that: the drain electrode of this field effect transistor connect one by this power supply always the supply circuit plate+5V voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520067945 CN2886892Y (en) | 2005-11-18 | 2005-11-18 | Protection circuit for power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520067945 CN2886892Y (en) | 2005-11-18 | 2005-11-18 | Protection circuit for power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2886892Y true CN2886892Y (en) | 2007-04-04 |
Family
ID=37961976
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520067945 Expired - Fee Related CN2886892Y (en) | 2005-11-18 | 2005-11-18 | Protection circuit for power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2886892Y (en) |
-
2005
- 2005-11-18 CN CN 200520067945 patent/CN2886892Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070404 Termination date: 20091218 |