CN106484068A - A kind of computer display card constant current-supplying circuit - Google Patents
A kind of computer display card constant current-supplying circuit Download PDFInfo
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- CN106484068A CN106484068A CN201611138164.6A CN201611138164A CN106484068A CN 106484068 A CN106484068 A CN 106484068A CN 201611138164 A CN201611138164 A CN 201611138164A CN 106484068 A CN106484068 A CN 106484068A
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- resistance
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- rectifier bridge
- audion
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/30—Means for acting in the event of power-supply failure or interruption, e.g. power-supply fluctuations
- G06F1/305—Means for acting in the event of power-supply failure or interruption, e.g. power-supply fluctuations in the event of power-supply fluctuations
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- Theoretical Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Power Sources (AREA)
Abstract
The invention discloses a kind of computer display card constant current-supplying circuit, including resistance R7, rectifier bridge T, three end adjustable reference source P and potentiometer RP1, one end of described resistance R7 connects electric capacity C1 and 220V alternating current, the other end of electric capacity C1 connects the other end of resistance R7 and the port 1 of rectifier bridge T, the port 3 of rectifier bridge T connects the other end of 220V alternating current, and the port 2 of rectifier bridge T connects electric capacity C1, the colelctor electrode of resistance R1, the colelctor electrode of audion V1 and audion V2.Computer display card constant current-supplying circuit of the present invention adopts voltage comparator and three end adjustable reference sources to form stable current feedback and adjust circuit, reach the purpose of constant-current source, effectively guarantee the electrical stability of video card, avoid the damage that start high current and shutdown immediate current cause to video card inner member, therefore have the advantages that vdiverse in function, control is accurate and easy to use.
Description
Technical field
The present invention relates to a kind of power circuit, specifically a kind of computer display card constant current-supplying circuit.
Background technology
With the continuous improvement of people's living standard, computer has become as a requisite part in life, especially
It is desktop computer and the life that notebook gives people, work bring great convenience.
Computer at this stage is equipped with the video card of larger capacity mostly, disclosure satisfy that required internal memory when running of large software,
Due to this kind of superior function of video card bar, also lead to its power consumption larger, need individually to power.The power type of existing market is numerous
Many, how its mid and low-end products is especially although low-end product has the advantage of price relative to high-end product, but quality is often not to the utmost
Comply with one's wishes, common power supply all has the defects such as single function, short life, interference free performance difference, although and high-end product quality can
Lean on, safety and stability, but price is high also to allow people hang back.Therefore need to be improved.
Content of the invention
It is an object of the invention to provide a kind of computer display card constant current-supplying circuit, to solve to carry in above-mentioned background technology
The problem going out.
For achieving the above object, the present invention provides following technical scheme：
A kind of computer display card constant current-supplying circuit, including resistance R7, rectifier bridge T, three end adjustable reference source P and potentiometer
One end of RP1, described resistance R7 connects electric capacity C1 and 220V alternating current, the other end of electric capacity C1 connect resistance R7 the other end and
The port 1 of rectifier bridge T, the other end of the port 3 connection 220V alternating current of rectifier bridge T, the port 2 connection electric capacity C1 of rectifier bridge T,
The colelctor electrode of resistance R1, the colelctor electrode of audion V1 and audion V2, the other end of resistance R1 connect resistance R4, resistance R5, three
The pin 3 of the negative electrode, the reference pole of three end adjustable reference source P and chip IC 1 of end adjustable reference source P, the pin 1 of chip IC 1 is even
The other end of connecting resistance R2 and resistance R3, electric capacity C2 connects the other end of resistance R3, fixing end, a current potential of potentiometer RP1
The sliding end of device RP1, the port 4 of resistance R6, the anode of three end adjustable reference source P and rectifier bridge T, the pin 4 of chip IC 1 connects
The other end of resistance R2 and the other end of resistance R4, the other end of resistance R5 connects another fixing end and the core of potentiometer RP1
The pin 3 of piece IC2, the pin 1 even other end of resistance R6 and the load A, the pin 4 connecting triode V1 of chip IC 2 of chip IC 2
Base stage, the base stage of the emitter stage connecting triode V2 of audion V1, the emitter stage of audion V2 connects the other end of load A.
Preferred version as the present invention：Model TL431 of described three end adjustable reference source P.
Preferred version as the present invention：The model of described chip IC 1 and chip IC 2 is LM321.
Preferred version as the present invention：Described resistance R7 and electric capacity C1 composition resistance-capacitance type reduction voltage circuit.
Preferred version as the present invention：The classical full-bridge that described rectifier bridge T is made up of four IN4001 type diodes
Rectification circuit.
Preferred version as the present invention：Described audion V1 and audion V2 is composed in series Darlington transistor.
Compared with prior art, the invention has the beneficial effects as follows：Computer display card constant current-supplying circuit of the present invention is using electricity
Pressure comparator and three end adjustable reference sources form stable current feedback and adjust circuit, reach the purpose of constant-current source, effectively guarantee
The electrical stability of video card, it is to avoid the damage that start high current causes to video card inner member with shutdown immediate current, therefore has
Functional various, control advantage accurate and easy to use.
Brief description
Fig. 1 is the circuit diagram of computer display card constant current-supplying circuit.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation description is it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of not making creative work
Embodiment, broadly falls into the scope of protection of the invention.
Refer to Fig. 1, in the embodiment of the present invention, a kind of computer display card constant current-supplying circuit, including resistance R7, rectifier bridge
T, three end adjustable reference source P and potentiometer RP1, one end of described resistance R7 connects electric capacity C1 and 220V alternating current, electric capacity C1's
The other end connects the other end of resistance R7 and the port 1 of rectifier bridge T, and the port 3 of rectifier bridge T connects the another of 220V alternating current
End, the port 2 of rectifier bridge T connects electric capacity C1, the colelctor electrode of resistance R1, the colelctor electrode of audion V1 and audion V2, resistance R1
The other end connect resistance R4, resistance R5, the negative electrode of three end adjustable reference source P, the reference pole of three end adjustable reference source P and chip
The pin 3 of IC1, the other end of other end connection resistance R3 of the pin 1 connection resistance R2 and resistance R3 of chip IC 1, electric capacity C2,
One fixing end of potentiometer RP1, the sliding end of potentiometer RP1, resistance R6, the anode of three end adjustable reference source P and rectifier bridge T
Port 4, the pin 4 of chip IC 1 connects the other end of resistance R2 and the other end of resistance R4, and the other end of resistance R5 connects electricity
Position another fixing end of device RP1 and the pin 3 of chip IC 2, the pin 1 even other end of resistance R6 and the load A of chip IC 2,
The base stage of the pin 4 connecting triode V1 of chip IC 2, the base stage of the emitter stage connecting triode V2 of audion V1, audion V2
Emitter stage connect the other end of load A, the model of described chip IC 1 and chip IC 2 is LM321.
Model TL431 of three end adjustable reference source P.The model of chip IC 1 and chip IC 2 is LM321.Resistance R7 and
Electric capacity C1 forms resistance-capacitance type reduction voltage circuit.The classical full bridge rectifier that rectifier bridge T is made up of four IN4001 type diodes.
Audion V1 and audion V2 is composed in series Darlington transistor.
The operation principle of the present invention is：220V line voltage is through the resistance-capacitance type step-down voltage of resistance R7 and electric capacity C1 composition
Enter in rectifier bridge T afterwards and carry out rectification, electric capacity C2 is filter capacitor, and the chip IC 1 in circuit is defined constant-current source circuit, makes three ends
Adjustable reference source P produces stable reference voltage, and when input current changes, the electric current on three end adjustable reference source P is protected substantially
Hold constant.Resistance R8 is current sampling resistor, carries out current feedback, so that the output voltage of chip IC 2 makes according to load
The change of load current and change, audion V1 and audion V2 composition multiple tube, by increasing capacitance it is possible to increase driving force, by chip
The output voltage of IC2 is thus change the bias of audion V1 and V2, and then reaches the purpose of constant output current, potentiometer RP1
The size of output current can easily be adjusted.
Computer display card constant current-supplying circuit of the present invention adopts voltage comparator and three end adjustable reference sources composition stable
Current feedback adjusts circuit, reaches the purpose of constant-current source, effectively guarantees the electrical stability of video card, it is to avoid start high current and pass
The damage that machine immediate current causes to video card inner member, therefore has the advantages that vdiverse in function, control is accurate and easy to use.
Claims (3)
1. a kind of computer display card constant current-supplying circuit, including resistance R7, rectifier bridge T, three end adjustable reference source P and potentiometer
It is characterised in that one end of described resistance R7 connects electric capacity C1 and 220V alternating current, the other end of electric capacity C1 connects resistance to RP1
The port 1 of the other end of R7 and rectifier bridge T, the port 3 of rectifier bridge T connects the other end of 220V alternating current, the port of rectifier bridge T
2 connect electric capacity C1, the colelctor electrode of resistance R1, the colelctor electrode of audion V1 and audion V2, and the other end of resistance R1 connects resistance
R4, resistance R5, the pin 3 of the negative electrode of three end adjustable reference source P, the reference pole of three end adjustable reference source P and chip IC 1, chip
The pin 1 of IC1 connects resistance R2 and resistance R3, the other end of electric capacity C2 connect the other end of resistance R3, one of potentiometer RP1
Fixing end, the sliding end of potentiometer RP1, the port 4 of resistance R6, the anode of three end adjustable reference source P and rectifier bridge T, chip IC 1
Pin 4 connect the other end of resistance R2 and the other end of resistance R4, the other end of resistance R5 connects another of potentiometer RP1
The pin 3 of fixing end and chip IC 2, the pin 1 even other end of resistance R6 and the load A of chip IC 2, the pin 4 of chip IC 2 is even
Connect the base stage of audion V1, the base stage of the emitter stage connecting triode V2 of audion V1, the emitter stage of audion V2 connects load A
The other end, model TL431 of described three end adjustable reference source P, the model of described chip IC 1 and chip IC 2 is
LM324, described resistance R7 and electric capacity C1 form resistance-capacitance type reduction voltage circuit.
2. computer display card constant current-supplying circuit according to claim 1 is it is characterised in that described rectifier bridge T is by four
The classical full bridge rectifier of individual IN4001 type diode composition.
3. computer display card constant current-supplying circuit according to claim 1 is it is characterised in that described audion V1 and three poles
Pipe V2 is composed in series Darlington transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611138164.6A CN106484068A (en) | 2016-12-12 | 2016-12-12 | A kind of computer display card constant current-supplying circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611138164.6A CN106484068A (en) | 2016-12-12 | 2016-12-12 | A kind of computer display card constant current-supplying circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106484068A true CN106484068A (en) | 2017-03-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611138164.6A Withdrawn CN106484068A (en) | 2016-12-12 | 2016-12-12 | A kind of computer display card constant current-supplying circuit |
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| Country | Link |
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| CN (1) | CN106484068A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108052192A (en) * | 2017-12-13 | 2018-05-18 | 天津大学 | Dual power supply voltage stabilizing computer motherboard charger |
| CN108072809A (en) * | 2017-12-18 | 2018-05-25 | 季梅 | A kind of electrical load detection of electrical leakage warning circuit |
-
2016
- 2016-12-12 CN CN201611138164.6A patent/CN106484068A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108052192A (en) * | 2017-12-13 | 2018-05-18 | 天津大学 | Dual power supply voltage stabilizing computer motherboard charger |
| CN108072809A (en) * | 2017-12-18 | 2018-05-25 | 季梅 | A kind of electrical load detection of electrical leakage warning circuit |
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| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20170308 |
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| WW01 | Invention patent application withdrawn after publication |