CN203573321U - Current-limiting protection regulating circuit applicable to computer - Google Patents
Current-limiting protection regulating circuit applicable to computer Download PDFInfo
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- CN203573321U CN203573321U CN201320736517.8U CN201320736517U CN203573321U CN 203573321 U CN203573321 U CN 203573321U CN 201320736517 U CN201320736517 U CN 201320736517U CN 203573321 U CN203573321 U CN 203573321U
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Abstract
The utility model discloses a current-limiting protection regulating circuit applicable to a computer. The current-limiting protection regulating circuit applicable to the computer comprises a first port and a second port. The first port is connected to the drain electrode of a field-effect tube M1 through a resistor R1, and the first port is also connected to the drain electrode of a field-effect tube M2. The second port is connected with the grid electrode of the field-effect tube M1 and the collector electrode of an audion at the same time through a resistor R2, and the second port is connected to the grid electrode of the field-effect tube M2. The source electrode of the field-effect tube M1 is connected with the ground, the source electrode of the field-effect tube M2 is connected to the emitting electrode of the audion, the base electrode of the audion is connected to the collector electrode through a resistor R3, and the emitting electrode of the audion is connected with the ground through a resistor R4. The current-limiting protection regulating circuit applicable to the computer has the advantages that the regulating circuit is connected to a switching power supply of the computer, the sampling precision to electric currents is high, current limiting is stable, and thus the computer can be effectively protected.
Description
Technical field
The utility model relates to computer protecting field, relates in particular a kind of current-limiting protection regulating circuit that is applicable to computer.
Background technology
Computer is widely applied to various aspects, such as video conference, remote monitoring, office operation etc.It is as power receiving equipment, when its Switching Power Supply is started working, due to the access of bypass microfarad range electric capacity, can produce surge current, unconfined large electric current will cause port voltage to decline rapidly, when serious, can make computer turn-off, computer is constantly switched between turning on and off, affect the stability of work.In order to guarantee the constant charge of power up to charging capacitor and the stable rising of start-up circuit, mostly adopt the structure of circuit limitations circuit to an output power pipe little sampling pipe in parallel, and the pull-up resistor that source electrode connects a low resistance completes current sample, because power tube gate source voltage in parallel is completely inequal, make the precision of sample rate current not high, current limliting is unstable.
Utility model content
The utility model provides a kind of current-limiting protection regulating circuit that is applicable to computer, and it is connected in the Switching Power Supply of computer, and its sampling precision to electric current is high, and current limliting is stable, effectively computer is protected.
For solving above-mentioned technical matters, the utility model by the following technical solutions:
Be applicable to the current-limiting protection regulating circuit of computer, it comprises the first port and the second port, the first described port is connected to by resistance R 1 in the drain electrode of field effect transistor M1, the first described port is also connected in the drain electrode of field effect transistor M2, the second described port is connected with the grid of field effect transistor M1 and the collector of triode by resistance R 2 simultaneously, the second described port is connected on the grid of field effect transistor M2, the source ground of described field effect transistor M1, the source electrode of described field effect transistor M2 is connected on the emitter of triode, the base stage of described triode is connected on collector by resistance R 3, the emitter of described triode is connected with ground by resistance R 4, described field effect transistor M1 and field effect transistor M2 are P type field effect transistor, described triode is NPN type triode.
Further technical scheme is:
As preferably, described resistance R 1, resistance R 2 and resistance R 4 are polysilicon resistance.
Further, the resistance of described resistance R 1 equates with the resistance of resistance R 2.
Compared with prior art, the beneficial effects of the utility model are:
The utility model comprises output power pipe, sampled power pipe and grid source proportion resistor, and the gate source voltage of field effect transistor M1 and field effect transistor M2 is completely equal, high to the sampling precision of electric current, and current limliting is stable, effectively computer is protected.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Fig. 1 is circuit theory diagrams of the present utility model.
Label in figure is: 1, the first port; 2, the second port.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described.Embodiment of the present utility model includes but not limited to the following example.
[embodiment]
The current-limiting protection regulating circuit that is applicable to computer as shown in Figure 1, it comprises the first port one and the second port 2, the first described port one is connected to by resistance R 1 in the drain electrode of field effect transistor M1, the first described port one is also connected in the drain electrode of field effect transistor M2, the second described port is connected with the grid of field effect transistor M1 and the collector of triode by resistance R 2 simultaneously, the second described port 2 is connected on the grid of field effect transistor M2, the source ground of described field effect transistor M1, the source electrode of described field effect transistor M2 is connected on the emitter of triode, the base stage of described triode is connected on collector by resistance R 3, the emitter of described triode is connected with ground by resistance R 4, described field effect transistor M1 and field effect transistor M2 are P type field effect transistor, described triode is NPN type triode.
The utility model is connected on the power switch of computer in use.In the utility model, field effect transistor M1 is for adopting power tube, and field effect transistor M2 is output power pipe, field effect transistor M1 and field effect transistor M2 composition grid common source circuit altogether, and it is as the active load of triode.Resistance R 3 is for triode provides conduction voltage drop, and resistance R 1 and resistance R 2 play dividing potential drop effect, makes field effect transistor M1 have rational voltage difference compared to field effect transistor M2.Sample rate current is converted to employing voltage through resistance R 4, regulates transistor collector voltage, and the grid voltage that gets final product regulation output power tube reaches the object of controlling output current size.The electric current of proportion resistor R4 can change along with the variation of output power tube grid voltage, guarantee that field effect transistor M1 gate source voltage is consistent with field effect transistor M2 gate source voltage, current limliting is stable, thereby reaches the object of accurate employing electric current, and this circuit is improved to the employing precision of electric current.
In order to improve the employing precision to circuit, described resistance R 1, resistance R 2 and resistance R 4 are polysilicon resistance.Resistance R 1, resistance R 2 and resistance R 4 are polysilicon resistance, can strengthen its matching, make precision high.
In order to improve the employing precision to circuit, the resistance of described resistance R 1 equates with the resistance of resistance R 2.Resistance R 1 and resistance R 2 play dividing potential drop effect, make field effect transistor M1 have rational voltage difference compared to field effect transistor M2, and the resistance of resistance R 1 equates with the resistance of resistance R 2, and voltage difference is equated, can make current sample precision be improved.
Be as mentioned above embodiment of the present utility model.The utility model is not limited to above-mentioned embodiment, and anyone should learn the structural change of making under enlightenment of the present utility model, every with the utlity model has identical or close technical scheme, within all falling into protection domain of the present utility model.
Claims (3)
1. be applicable to the current-limiting protection regulating circuit of computer, it is characterized in that: it comprises the first port and the second port, the first described port is connected to by resistance R 1 in the drain electrode of field effect transistor M1, the first described port is also connected in the drain electrode of field effect transistor M2, the second described port is connected with the grid of field effect transistor M1 and the collector of triode by resistance R 2 simultaneously, the second described port is connected on the grid of field effect transistor M2, the source ground of described field effect transistor M1, the source electrode of described field effect transistor M2 is connected on the emitter of triode, the base stage of described triode is connected on collector by resistance R 3, the emitter of described triode is connected with ground by resistance R 4, described field effect transistor M1 and field effect transistor M2 are P type field effect transistor, described triode is NPN type triode.
2. the current-limiting protection regulating circuit that is applicable to computer according to claim 1, is characterized in that: described resistance R 1, resistance R 2 and resistance R 4 are polysilicon resistance.
3. the current-limiting protection regulating circuit that is applicable to computer according to claim 1 and 2, is characterized in that: the resistance of described resistance R 1 equates with the resistance of resistance R 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320736517.8U CN203573321U (en) | 2013-11-21 | 2013-11-21 | Current-limiting protection regulating circuit applicable to computer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320736517.8U CN203573321U (en) | 2013-11-21 | 2013-11-21 | Current-limiting protection regulating circuit applicable to computer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203573321U true CN203573321U (en) | 2014-04-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320736517.8U Expired - Fee Related CN203573321U (en) | 2013-11-21 | 2013-11-21 | Current-limiting protection regulating circuit applicable to computer |
Country Status (1)
| Country | Link |
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| CN (1) | CN203573321U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103745168A (en) * | 2013-11-21 | 2014-04-23 | 成都市宏山科技有限公司 | Current-limiting protection regulating circuit used for computer |
-
2013
- 2013-11-21 CN CN201320736517.8U patent/CN203573321U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103745168A (en) * | 2013-11-21 | 2014-04-23 | 成都市宏山科技有限公司 | Current-limiting protection regulating circuit used for computer |
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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: 20140430 Termination date: 20141121 |
|
| EXPY | Termination of patent right or utility model |