CN107104578B - A kind of linear power supply classification adjustment output circuit - Google Patents
A kind of linear power supply classification adjustment output circuit Download PDFInfo
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- CN107104578B CN107104578B CN201710346502.3A CN201710346502A CN107104578B CN 107104578 B CN107104578 B CN 107104578B CN 201710346502 A CN201710346502 A CN 201710346502A CN 107104578 B CN107104578 B CN 107104578B
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- triode
- power supply
- diode
- transistor
- resistor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses a kind of linear power supplies to be classified adjustment output circuit.Linear adjustable stabilized voltage supply adjustment pipe generally uses triode and metal-oxide-semiconductor, triode operation is in amplification region, its advantage has the characteristics that small ripple, low noise, adjustable range are wide, but between triode emitter and collector itself there are pressure drops, it will cause biggish energy loss, pipe fever is obvious, needs good radiator.The present invention can effectively be improved source current adjustment output width and output accuracy, reduce tube voltage drop loss, be improved adjustment pipe service life, and circuit structure is simple, there is good prospect of the application in accurate measurement power supply using second level adjustment power supply output.
Description
Technical field
The present invention relates to linear power supply technical field, specially a kind of linear power supply classification adjustment output circuit.
Background technique
Linear stabilized power supply has many advantages, such as that ripple is small, noise is low, adjustable range is wide and is widely used in fine measuring instrument instrument
In table, but linear power supply adjustment pipe is generally adjusted with large power triode or mos pipe, it locates always when metal-oxide-semiconductor is adjusted
The disadvantages such as in the switching of high-speed switch state, noise is big, is easy to generate heat, and pipe service life is low；And large power triode conduct
Adjustment pipe also has disadvantage: triode is in magnifying state, and there are the pressure drops of collector and transmitting interpolar, causes circuit loss big.
Therefore a kind of new technical solution is needed to solve the above problems.
Summary of the invention
To solve the shortcomings of the prior art, the present invention provides a kind of linear power supplies to be classified adjustment output circuit, solution
It has determined the deficiencies in the prior art.
In order to achieve the above object, the present invention is achieved by the following technical programs: a kind of linear power supply classification adjustment is defeated
Circuit out, including the first triode, the second triode, first resistor, second resistance, 3rd resistor, first diode, the two or two
Pole pipe, third diode, first capacitor and the second capacitor, described second resistance one end are connected with the second transistor emitter, separately
One end is connected with the second transistor base, and the first capacitor is in parallel with second resistance；First transistor base passes through the
One resistance meets Vin, and collector is connected with the second transistor base, and emitter passes through 3rd resistor and the second transistor collector phase
Even；Second capacitor is in parallel with 3rd resistor, and the first diode anode is connected with the first transistor emitter, cathode with
Second diode cathode is connected, and second diode cathode is connected with the second transistor collector；The third diode is just
The pole cathode that is connected with the second transistor collector is connected with the second transistor base；Second transistor emitter meets VDD, collection
Electrode meets Vout.
Preferably, first triode is NPN type triode, and second triode is PNP type triode.
Circuit operation principle: the resistance value of 3rd resistor R3 is twice of second resistance R2, when the first triode Q1 electric current reaches
When to Io=1.4V/R3, voltage U=IoR2 on first resistor R1, due to R3=2R2, then the second triode Q2 emitter with
Voltage increases between base stage, it is made to start to adjust electric current.
The present invention provides a kind of linear power supplies to be classified adjustment output circuit, has following the utility model has the advantages that realizing power supply tune
The classification of whole circuit is adjusted: when the first triode is in magnifying state to electric current in the range of design, realize the adjustment of power supply, when
When electric current reaches the value of design, the second triode is started to work, and the first transistor collector electric current not will increase.Therefore this hair
Bright circuit in low current have very high-precision source current adjustment capability, and larger current output can also protect
The operating current of first triode, improves service life, and reduces loss.
Detailed description of the invention
Fig. 1 is circuit diagram of the present invention.
In figure: Q1, the first triode, Q2, the second triode, R1, first resistor, R2, second resistance, R3,3rd resistor,
D1, first diode, D2, the second diode, D3, third diode, C1, first capacitor, C2, the second capacitor.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Referring to Fig. 1, the present invention provides a kind of technical solution: a kind of linear power supply classification adjustment output circuit, including the
One triode Q1, the second triode Q2, first resistor R1, second resistance R2,3rd resistor R3, first diode D1, the two or two
Pole pipe D2, third diode D3, first capacitor C1 and the second capacitor C2, the one end the second resistance R2 and the second triode Q2 are sent out
Emitter-base bandgap grading is connected, and the other end is connected with the second triode Q2 base stage, and the first capacitor C1 is in parallel with second resistance R2；Described first
Triode Q1 base stage meets Vin by first resistor R1, and collector is connected with the second triode Q2 base stage, and emitter passes through third electricity
Resistance R3 is connected with the second triode Q2 collector；The second capacitor C2 is in parallel with 3rd resistor R3, the first diode D1
Anode is connected with the first triode Q1 emitter, and cathode is connected with the second diode D2 anode, the second diode D2 cathode
It is connected with the second triode Q2 collector；The third diode D3 anode is connected cathode and with the second triode Q2 collector
Two triode Q2 base stages are connected；The second triode Q2 emitter meets VDD, and collector meets Vout.The first triode Q1
For NPN type triode, the second triode Q2 is PNP type triode.
Circuit operation principle: the resistance value of 3rd resistor R3 is twice of second resistance R2, when the first triode Q1 electric current reaches
When to Io=1.4V/R3, voltage U=IoR2 on first resistor R1, due to R3=2R2, then the second triode Q2 emitter with
Voltage increases between base stage, it is made to start to adjust electric current.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (2)
1. a kind of linear power supply classification adjustment output circuit, including the first triode, the second triode, first resistor, the second electricity
Resistance, 3rd resistor, first diode, the second diode, third diode, first capacitor and the second capacitor, it is characterised in that:
Described second resistance one end is connected with the second transistor emitter, and the other end is connected with the second transistor base, and described
One capacitor is in parallel with second resistance；
First transistor base meets Vin by first resistor, and collector is connected with the second transistor base, and emitter passes through
3rd resistor is connected with the second transistor collector；
Second capacitor is in parallel with 3rd resistor, and the first diode anode is connected with the first transistor emitter, cathode
It is connected with the second diode cathode, second diode cathode is connected with the second transistor collector；
The third diode cathode is connected with the second transistor collector, and cathode is connected with the second transistor base；
Second transistor emitter meets VDD, and collector meets Vout.
2. a kind of linear power supply classification adjustment output circuit according to claim 1, it is characterised in that: the one or three pole
Pipe is NPN type triode, and second triode is PNP type triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710346502.3A CN107104578B (en) | 2017-05-17 | 2017-05-17 | A kind of linear power supply classification adjustment output circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710346502.3A CN107104578B (en) | 2017-05-17 | 2017-05-17 | A kind of linear power supply classification adjustment output circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107104578A CN107104578A (en) | 2017-08-29 |
| CN107104578B true CN107104578B (en) | 2019-05-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710346502.3A Active CN107104578B (en) | 2017-05-17 | 2017-05-17 | A kind of linear power supply classification adjustment output circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN107104578B (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6335654B1 (en) * | 2000-03-17 | 2002-01-01 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Inrush current control circuit |
| CN2904068Y (en) * | 2005-03-07 | 2007-05-23 | 圆创科技股份有限公司 | Linear voltage regulator |
| CN102751887A (en) * | 2012-07-25 | 2012-10-24 | 刘喆 | High-power adjustable DC (Direct Current) stabilized voltage power supply |
| CN202735878U (en) * | 2012-07-25 | 2013-02-13 | 周芸 | Heavy-current adjustable voltage stabilizer |
| CN104679087B (en) * | 2013-11-26 | 2016-08-17 | 惠州市德赛西威汽车电子股份有限公司 | Vehicle-mounted low differential voltage linear voltage stabilizer circuit and low-voltage compensation circuit thereof |
| CN105553008A (en) * | 2015-12-29 | 2016-05-04 | 宁波市安博新能源科技有限公司 | Battery charging circuit |
-
2017
- 2017-05-17 CN CN201710346502.3A patent/CN107104578B/en active Active
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| Publication number | Publication date |
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| CN107104578A (en) | 2017-08-29 |
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Effective date of registration: 20230506 Address after: 213000 No. 1, Xinzhu Road, Xinbei District, Changzhou City, Jiangsu Province Patentee after: CHANGZHOU TONGHUI ELECTRONICS Co.,Ltd. Address before: 213001 No. 1801 Wu Cheng Road, Changzhou, Jiangsu Patentee before: JIANGSU University OF TECHNOLOGY |
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