CN101902121A - Current increasing and voltage stabilizing circuit with current limiting function - Google Patents
Current increasing and voltage stabilizing circuit with current limiting function Download PDFInfo
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- CN101902121A CN101902121A CN2010102142600A CN201010214260A CN101902121A CN 101902121 A CN101902121 A CN 101902121A CN 2010102142600 A CN2010102142600 A CN 2010102142600A CN 201010214260 A CN201010214260 A CN 201010214260A CN 101902121 A CN101902121 A CN 101902121A
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Abstract
The invention relates to a current increasing and voltage stabilizing circuit with a current limiting function, comprising a current increasing unit used for increasing and outputting a current, a current limiting unit used for limiting overlarge current output by the current increasing unit and a voltage stabilizing unit used for supplying stable output voltage to voltage output by the current increasing unit and the current limiting unit, wherein the input end of the current increasing unit is electrically connected with a power input end of the current increasing and voltage stabilizing circuit, the output end of the current increasing unit is connected with the input end of the current limiting unit, the output end of the current limiting unit is electrically connected with the output end of the voltage stabilizing unit, and the point in which the output end of the current limiting unit is electrically connected with the output end of the voltage stabilizing unit is electrically connected with the power input end of the current increasing and voltage stabilizing circuit. The current increasing and voltage stabilizing circuit with the current limiting function limits the current of the current increasing and voltage stabilizing circuit by adopting the current limiting unit and the voltage stabilizing unit, thereby avoiding that the current is too large to damage the voltage stabilizing unit.
Description
[technical field]
The present invention relates to electronic circuit field, particularly a kind of current increasing and voltage stabilizing circuit with current-limiting function.
[background technology]
In the existing stage, a lot of used power supply voltages of electric product all are lower than line voltage.At this moment just need take the reduction voltage circuit design, for load provides a suitable power supply.At present, when the design reduction voltage circuit, generally can adopt the three-terminal voltage-stabilizing circuit, this circuit is simple, suitable.
But, adopt this three-terminal voltage-stabilizing circuit incremental after, tend to damage transistor or voltage-stabilizing device because of electric current is excessive.
[summary of the invention]
Based on this, be necessary to provide a kind of current increasing and voltage stabilizing circuit that can limit the excessive band current-limiting function of electric current.
A kind of current increasing and voltage stabilizing circuit with current-limiting function, comprise the incremental unit and the restriction excessive current limliting unit of output current, described incremental unit that increase output current, and the voltage regulation unit that regulated output voltage is provided for the voltage of described incremental unit and the output of current limliting unit, the input of described incremental unit is electrically connected with the power input of this current increasing and voltage stabilizing circuit, the output of described incremental unit links to each other with the input of described current limliting unit, the output of described current limliting unit and the output of described voltage regulation unit are electrically connected, and the tie point that the output of described current limliting unit is electrically connected with the output of voltage regulation unit is electrically connected with the power output end of this current increasing and voltage stabilizing circuit.
Preferably, described incremental unit comprises incremental unit of one-level and the incremental unit of secondary, the input of the incremental unit of described one-level is electrically connected with the power input of this current increasing and voltage stabilizing circuit, the output of the incremental unit of described one-level is electrically connected with the input of the incremental unit of described secondary, and the output of the incremental unit of described secondary is electrically connected with the input of described current limliting unit.
Preferably, the incremental unit of described one-level comprises one-level biasing resistor and the incremental transistor of one-level; Described one-level biasing resistor is connected in series between incremental transistorized emitter of one-level and the base stage, the incremental transistorized emitter of described one-level is electrically connected with the power input of this current increasing and voltage stabilizing circuit, the incremental transistorized base stage of described one-level is electrically connected with the input of described voltage regulation unit, and the incremental transistorized collector electrode of described one-level is electrically connected with the input of the incremental unit of described secondary.
Preferably, the incremental unit of described secondary comprises secondary biasing resistor and the incremental transistor of secondary, described secondary biasing resistor is connected in series in incremental transistorized collector electrode of described one-level and the incremental transistorized base stage of described secondary, the incremental transistorized collector electrode of described secondary is electrically connected with the power input of this current increasing and voltage stabilizing circuit, and the incremental transistorized emitter of described secondary is electrically connected with the input of described current limliting unit.
Preferably, described current limliting unit comprises current limliting transistor and current limliting biasing resistor, the transistorized collector electrode of described current limliting is electrically connected with the incremental transistorized base stage of described secondary, the transistorized base stage of described current limliting is electrically connected with the incremental transistorized emitter of described secondary, and the transistorized emitter of described current limliting is electrically connected with the power output end of this current increasing and voltage stabilizing circuit; Described current limliting biasing resistor is connected in series between transistorized base stage of described current limliting and the emitter.
Preferably, the incremental transistor of described one-level is a PNP transistor, and the incremental transistor of secondary is a NPN transistor, and the current limliting transistor is a PNP transistor.
Preferably, described voltage regulation unit comprises voltage-stabilizing device, regulates resistance and voltage regulation resistance, the input of described voltage-stabilizing device links to each other with the incremental transistorized base stage of described one-level, the adjustable side of described voltage-stabilizing device is by described adjusting grounding through resistance, the output of described voltage-stabilizing device is electrically connected with the power output end of this current increasing and voltage stabilizing circuit, and described voltage regulation resistance is connected between the adjustable side and output of described voltage-stabilizing device.
Preferably, described voltage regulation unit also comprises voltage stabilizing input filter capacitor and voltage stabilizing output filter capacitor, and an end of described voltage stabilizing input filter capacitor links to each other with the input of voltage-stabilizing device, other end ground connection, and described voltage stabilizing output filter capacitor is in parallel with adjusting resistance.
Preferably, described voltage-stabilizing device is LM317.
Preferably, this current increasing and voltage stabilizing circuit also comprises circuit input filter capacitor and circuit output filter capacitor, and an end of described circuit input filter capacitor and the power input of this current increasing and voltage stabilizing circuit are electrically connected, other end ground connection; One end of described circuit output filter capacitor and the power output end of this current increasing and voltage stabilizing circuit are electrically connected, other end ground connection.
The current increasing and voltage stabilizing circuit of above-mentioned band current-limiting function adopts current limliting unit and voltage regulation unit, has limited the electric current of current increasing and voltage stabilizing circuit, thereby has avoided electric current excessive, damages voltage regulation unit.
[description of drawings]
Fig. 1 is the structural representation of the current increasing and voltage stabilizing circuit of band current-limiting function among the embodiment;
Fig. 2 is the current increasing and voltage stabilizing circuit principle schematic of one embodiment of the present of invention band current-limiting function.
[embodiment]
As Fig. 1, a kind of current increasing and voltage stabilizing circuit with current-limiting function, comprise the incremental unit and the restriction excessive current limliting unit of output current, incremental unit that increase output current, and the voltage regulation unit that regulated output voltage is provided for the voltage of incremental unit and the output of current limliting unit, the input of incremental unit is electrically connected with the power input of this current increasing and voltage stabilizing circuit, the output of incremental unit links to each other with the input of current limliting unit, the output of current limliting unit and the output of voltage regulation unit are electrically connected, and the tie point that the output of current limliting unit is electrically connected with the output of voltage regulation unit is electrically connected with the power output end of this current increasing and voltage stabilizing circuit.
As shown in Figure 2, the output of incremental unit links to each other with the input of current limliting unit 300, and the output of current limliting unit 300 links to each other with the output of voltage regulation unit 400, and its tie point is electrically connected with the power output end of this current increasing and voltage stabilizing circuit; Wherein, incremental unit comprises incremental unit 100 of one-level and the incremental unit 200 of secondary, the input of the incremental unit 100 of one-level is electrically connected with the power input of this current increasing and voltage stabilizing circuit, the output of the incremental unit 100 of one-level is electrically connected with the input of the incremental unit 200 of secondary, and the output of the incremental unit 200 of secondary is electrically connected with the input of current limliting unit 300.
In the present embodiment, incremental unit comprises the incremental unit of being made up of one-level biasing resistor R1 and the incremental transistor Q1 of one-level 100 of one-level, and the incremental unit of being made up of secondary biasing resistor R2 and the incremental transistor Q2 of secondary 200 of secondary.Current limliting unit 300 comprises current limliting transistor Q3 and current-limiting resistance R3.Voltage regulation unit 400 comprises voltage-stabilizing device U1, regulates resistance R 5, voltage regulation resistance R4, voltage stabilizing input filter capacitor C2 and voltage stabilizing output filter capacitor C4.Current increasing and voltage stabilizing circuit also comprises circuit input filter capacitor C1 and circuit output filter capacitor C3.Wherein, the incremental transistor Q1 of one-level is the positive-negative-positive triode, and the incremental transistor Q2 of secondary is a NPN type triode, and current limliting transistor Q3 is the positive-negative-positive triode, and voltage-stabilizing device is LM317.
In the present embodiment, the annexation between each element of current increasing and voltage stabilizing circuit is: circuit input filter capacitor C1 one end is electrically connected other end ground connection with the power input of this current increasing and voltage stabilizing circuit; Between the emitter and base stage that are connected in series in the incremental transistor Q1 of one-level of one-level biasing resistor R1, the emitter of the incremental transistor Q1 of one-level is electrically connected with the power input of this current increasing and voltage stabilizing circuit, the base stage of the incremental transistor Q1 of one-level is electrically connected with the input of voltage-stabilizing device U1 (Vin pin), secondary biasing resistor R2 is connected in series between the base stage of the collector electrode of the incremental transistor Q1 of one-level and the incremental transistor Q2 of secondary, the collector electrode of the incremental transistor Q2 of secondary is electrically connected with the power input of this current increasing and voltage stabilizing circuit, the emitter of the incremental transistor Q2 of secondary is electrically connected with the base stage of the current limliting transistor Q3 of current limliting unit 300, the base stage of the incremental transistor Q2 of secondary is electrically connected with the collector electrode of current limliting transistor Q3, the emitter of current limliting transistor Q3 is electrically connected with the power output end of this current increasing and voltage stabilizing circuit, and current-limiting resistance R3 is connected in series between the base stage and emitter of current limliting transistor Q3; The end of voltage stabilizing input filter capacitor C2 is electrically connected with the input of voltage-stabilizing device U1 (Vin pin), other end ground connection, the adjustable side of voltage-stabilizing device U1 (ADJ pin) is by regulating resistance R 5 ground connection, voltage stabilizing output filter capacitor C4 is in parallel with adjusting resistance R 5, the output of voltage-stabilizing device U1 (Vout pin) is electrically connected with the power output end of current increasing and voltage stabilizing circuit, and voltage regulation resistance R4 is connected between the adjustable side (ADJ pin) and output (Vout pin) of voltage-stabilizing device U1; Output filter capacitor C3 one end is electrically connected with the power output end of current increasing and voltage stabilizing circuit, other end ground connection.
After the current increasing and voltage stabilizing circuit of above-mentioned band current-limiting function connects power supply, input voltage is Vin, the electric current of the one-level of flowing through biasing resistor R1 is Ir, the base current of the incremental transistor Q1 of one-level is Ib, and the emitter current of the incremental transistor Q2 of secondary is Ie, and collector current is Ic, the input current of voltage-stabilizing device U1 is Iin, regulating the electric current of flowing through on the resistance R 5 is Ig, and the output current of voltage-stabilizing device is Ixx, and the output current of current increasing and voltage stabilizing circuit is that Io, output voltage are Vout.Wherein, voltage-stabilizing device LM317 provides regulated output voltage for current increasing and voltage stabilizing circuit, and this output voltage is by R4 and R5 decision, and computing formula is as follows:
Vout=1.25* (1+R5/R4)+Ig*R5, Ig is controlled in the 0.1mA, then usually
Vout＝1.25*(1+R5/R4)。
The incremental course of work of the current increasing and voltage stabilizing circuit of above-mentioned band current-limiting function is: according to the output current Io in the load, during as Io＞0.7/R1, after circuit input end inserts input voltage vin, when the last voltage drop of one-level biasing resistor R1 reaches 0.7V, incremental transistor Q1 of one-level and the incremental transistor Q2 of secondary conducting one by one, the part of input current is passed through from Q2, and output current Io=Ixx+Ie plays incremental effect.
The current limliting course of work of the current increasing and voltage stabilizing circuit of above-mentioned band current-limiting function is: when the pressure drop of electric current I e on R3 by the incremental transistor Q2 of secondary reaches 0.7V, current limliting transistor Q3 begins conducting, make the base stage of the incremental transistor Q2 of secondary and the voltage Vbe pressure drop between the emitter reduce, the incremental transistor Q2 of secondary is ended, the increase of restriction electric current, reached current-limiting function to the incremental transistor Q2 of secondary, simultaneously the incremental transistor Q1 of one-level limits the output current of LM317 with one-level biasing resistor R1, and this moment, the output current of entire circuit was Io=0.7V/R1.
The current increasing and voltage stabilizing circuit of above-mentioned band current-limiting function adopts current limliting unit 300 and voltage regulation unit 400, has limited the electric current of current increasing and voltage stabilizing circuit, thereby has avoided electric current excessive, damages voltage regulation unit.
In addition, it is incremental to adopt incremental transistor Q1 of one-level and the incremental transistor Q2 of secondary to carry out, and adopts current limliting transistor Q3 that the incremental transistor Q2 of secondary is carried out current limliting again; guaranteed the incremental of circuit; also limited the excessive of electric current, circuit structure is simple, and is reliable; device reduces; with low cost, debugging is simple, and does not have Electro Magnetic Compatibility (Electro Magnetic Compatibility for linear power supply; EMC) problem is suitably for the incremental usefulness that various voltage dropping power supplies are done band current-limiting protection function.
The above embodiment has only expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to claim of the present invention.Should be pointed out that for the person of ordinary skill of the art without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (10)
1. current increasing and voltage stabilizing circuit with current-limiting function, it is characterized in that, comprise the incremental unit and the restriction excessive current limliting unit of output current, described incremental unit that increase output current, and the voltage regulation unit that regulated output voltage is provided for the voltage of described incremental unit and the output of current limliting unit, the input of described incremental unit is electrically connected with the power input of this current increasing and voltage stabilizing circuit, the output of described incremental unit links to each other with the input of described current limliting unit, the output of described current limliting unit and the output of described voltage regulation unit are electrically connected, and the tie point that the output of described current limliting unit is electrically connected with the output of voltage regulation unit is electrically connected with the power output end of this current increasing and voltage stabilizing circuit.
2. the current increasing and voltage stabilizing circuit of band current-limiting function according to claim 1, it is characterized in that, described incremental unit comprises incremental unit of one-level and the incremental unit of secondary, the input of the incremental unit of described one-level is electrically connected with the power input of this current increasing and voltage stabilizing circuit, the output of the incremental unit of described one-level is electrically connected with the input of the incremental unit of described secondary, and the output of the incremental unit of described secondary is electrically connected with the input of described current limliting unit.
3. the current increasing and voltage stabilizing circuit of band current-limiting function according to claim 2 is characterized in that, the incremental unit of described one-level comprises one-level biasing resistor and the incremental transistor of one-level; Described one-level biasing resistor is connected in series between incremental transistorized emitter of one-level and the base stage, the incremental transistorized emitter of described one-level is electrically connected with the power input of this current increasing and voltage stabilizing circuit, the incremental transistorized base stage of described one-level is electrically connected with the input of described voltage regulation unit, and the incremental transistorized collector electrode of described one-level is electrically connected with the input of the incremental unit of described secondary.
4. the current increasing and voltage stabilizing circuit of band current-limiting function according to claim 3, it is characterized in that, the incremental unit of described secondary comprises secondary biasing resistor and the incremental transistor of secondary, described secondary biasing resistor is connected in series in incremental transistorized collector electrode of described one-level and the incremental transistorized base stage of described secondary, the incremental transistorized collector electrode of described secondary is electrically connected with the power input of this current increasing and voltage stabilizing circuit, and the incremental transistorized emitter of described secondary is electrically connected with the input of described current limliting unit.
5. the current increasing and voltage stabilizing circuit of band current-limiting function according to claim 4, it is characterized in that, described current limliting unit comprises current limliting transistor and current limliting biasing resistor, the transistorized collector electrode of described current limliting is electrically connected with the incremental transistorized base stage of described secondary, the transistorized base stage of described current limliting is electrically connected with the incremental transistorized emitter of described secondary, and the transistorized emitter of described current limliting is electrically connected with the power output end of this current increasing and voltage stabilizing circuit; Described current limliting biasing resistor is connected in series between transistorized base stage of described current limliting and the emitter.
6. the current increasing and voltage stabilizing circuit of band current-limiting function according to claim 5 is characterized in that, the incremental transistor of described one-level is a PNP transistor, and the incremental transistor of secondary is a NPN transistor, and the current limliting transistor is a PNP transistor.
7. the current increasing and voltage stabilizing circuit of band current-limiting function according to claim 3, it is characterized in that, described voltage regulation unit comprises voltage-stabilizing device, regulates resistance and voltage regulation resistance, the input of described voltage-stabilizing device links to each other with the incremental transistorized base stage of described one-level, the adjustable side of described voltage-stabilizing device is by described adjusting grounding through resistance, the output of described voltage-stabilizing device is electrically connected with the power output end of this current increasing and voltage stabilizing circuit, and described voltage regulation resistance is connected between the adjustable side and output of described voltage-stabilizing device.
8. the current increasing and voltage stabilizing circuit of band current-limiting function according to claim 7, it is characterized in that, described voltage regulation unit also comprises voltage stabilizing input filter capacitor and voltage stabilizing output filter capacitor, one end of described voltage stabilizing input filter capacitor links to each other with the input of voltage-stabilizing device, other end ground connection, described voltage stabilizing output filter capacitor is in parallel with adjusting resistance.
9. according to the current increasing and voltage stabilizing circuit of claim 7 or 8 described band current-limiting functions, it is characterized in that described voltage-stabilizing device is LM317.
10. the current increasing and voltage stabilizing circuit of band current-limiting function according to claim 1, it is characterized in that, this current increasing and voltage stabilizing circuit also comprises circuit input filter capacitor and circuit output filter capacitor, one end of described circuit input filter capacitor and the power input of this current increasing and voltage stabilizing circuit are electrically connected, other end ground connection; One end of described circuit output filter capacitor and the power output end of this current increasing and voltage stabilizing circuit are electrically connected, other end ground connection.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102142600A CN101902121A (en) | 2010-06-29 | 2010-06-29 | Current increasing and voltage stabilizing circuit with current limiting function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102142600A CN101902121A (en) | 2010-06-29 | 2010-06-29 | Current increasing and voltage stabilizing circuit with current limiting function |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107959342A (en) * | 2017-12-25 | 2018-04-24 | 黑龙江龙电电气有限公司 | A kind of method of supplying power to of Urban Underground pipe gallery |
| CN116800075A (en) * | 2023-08-24 | 2023-09-22 | 深圳市微源半导体股份有限公司 | Power supply circuit, linear power supply and electronic equipment |
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| US6184667B1 (en) * | 1997-09-09 | 2001-02-06 | James Christopher Lacey | DC/DC converter |
| CN2896694Y (en) * | 2006-05-08 | 2007-05-02 | 于波 | Permanent controllable constant-pressure generator control cirulit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107959342A (en) * | 2017-12-25 | 2018-04-24 | 黑龙江龙电电气有限公司 | A kind of method of supplying power to of Urban Underground pipe gallery |
| CN116800075A (en) * | 2023-08-24 | 2023-09-22 | 深圳市微源半导体股份有限公司 | Power supply circuit, linear power supply and electronic equipment |
| CN116800075B (en) * | 2023-08-24 | 2023-11-21 | 深圳市微源半导体股份有限公司 | Power supply circuit, linear power supply and electronic equipment |
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Application publication date: 20101201 |