CN101887281A - Current increasing and voltage stabilizing circuit - Google Patents
Current increasing and voltage stabilizing circuit Download PDFInfo
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- CN101887281A CN101887281A CN2010102141275A CN201010214127A CN101887281A CN 101887281 A CN101887281 A CN 101887281A CN 2010102141275 A CN2010102141275 A CN 2010102141275A CN 201010214127 A CN201010214127 A CN 201010214127A CN 101887281 A CN101887281 A CN 101887281A
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Abstract
The invention discloses a current increasing and voltage stabilizing circuit. The circuit comprises a current increasing unit and a voltage stabilizing unit, wherein the voltage stabilizing unit is electrically connected with the current increasing unit and provides a stable output voltage; the current increasing unit also comprises a biasing resistor and a transistor; the biasing resistor is electrically connected between a positive electrode of a power input end and a base of the transistor; a connection point between the biasing resistor and the base of the transistor is electrically connected with an input end of the voltage stabilizing unit; an emitter of the transistor is connected to the positive electrode of the power input end of the current increasing and voltage stabilizing circuit; and a collector of the transistor is connected to an output end of the voltage stabilizing unit. The current increasing and voltage stabilizing circuit is provided with the current increasing unit and the voltage stabilizing unit between the power input end and the output end, the current of the power input end after linear voltage drop can be increased by the current increasing unit and transmitted to the voltage stabilizing unit; and thus a current-increased and voltage-stabilized power is output and a voltage-stabilized current required by a subsequent circuit or load is obtained.
Description
[technical field]
The present invention relates to electronic circuit field, the current increasing and voltage stabilizing circuit behind particularly a kind of linear voltage decreasing.
[background technology]
In the existing stage, a lot of used power supply voltages of electronic and electrical equipment 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, when the three-terminal voltage-stabilizing circuit need be exported the situation of big electric current at some, often just can not meet the demands, as, circuit need be exported the power supply of 5V/2A, and in fact the out-put supply of 5V/1.5A can only be provided.Because it is required that the electric current of out-put supply can not satisfy, also just seriously restricted the operate as normal of subsequent conditioning circuit or load.
[summary of the invention]
Based on this, be necessary to provide the incremental voltage-stabilizing output circuit behind a kind of linear voltage decreasing.
A kind of current increasing and voltage stabilizing circuit, comprise incremental unit and be electrically connected with described incremental unit and the voltage regulation unit of regulated output voltage is provided, described incremental unit comprises biasing resistor and transistor again, described biasing resistor is electrically connected between the anodal and described transistorized base stage of described power input, and described biasing resistor is electrically connected with described voltage regulation unit with tie point between the described transistorized base stage; Described transistorized emitter and collector is connected in series on the described power input positive pole, and described transistorized emitter is electrically connected with tie point between described biasing resistor and the power input positive pole.
Preferably, described incremental unit also comprises first filter capacitor, and described filter capacitor one end is electrically connected with tie point between described biasing resistor and the power input positive pole, and the other end is connected with described power input negative electricity, and tie point ground connection.
Preferably, described transistor is a PNP transistor.
Preferably, described voltage regulation unit comprises three terminal regulator, the current input terminal of described three terminal regulator is electrically connected with the tie point of described biasing resistor and transistor base, the current output terminal of described three terminal regulator is electrically connected with described transistorized collector, the earth terminal ground connection of described three terminal regulator.
Preferably, described voltage regulation unit also comprises input filter capacitor and output filter capacitor, and described input filter capacitor is connected between the current input terminal and ground of described three terminal regulator; Described output filter capacitor is connected between the current output terminal and ground of described three terminal regulator.
Preferably, the model of described three terminal regulator is 78 series types.
Preferably, the model of described three terminal regulator is the LM317 type.
Current increasing and voltage stabilizing circuit provided by the invention, between power input and output terminal, set up incremental unit and voltage regulation unit, after electric current behind the linear voltage decreasing of power input can being increased processing by incremental unit, flow to voltage regulation unit, export incremental stabilized voltage supply by it, satisfied the required electric current of voltage regulation of subsequent conditioning circuit or load; In addition, the incremental unit that adopts a biasing resistor and transistor to constitute, simple in structure, device is less, and is with low cost, and is used for linear power supply and do not have the EMC problem, is suitably for various voltage dropping power supplies and carries out incremental.
[description of drawings]
Fig. 1 is the circuit theory diagrams of current increasing and voltage stabilizing circuit of the present invention.
[embodiment]
The present invention will be described in detail below in conjunction with accompanying drawing and specific embodiment.
As shown in Figure 1, a kind of current increasing and voltage stabilizing circuit comprises incremental unit 100 and is electrically connected with incremental unit 100 and the voltage regulation unit 200 of regulated output voltage is provided; Incremental unit 100 is electrically connected with the power input Vin of this circuit.Like this, by incremental unit 100 in this circuit, the linear voltage decreasing of the power input Vin of this circuit can be carried out incremental processing, and send voltage regulation unit 200 to carry out voltage stabilizing incremental power supply and handle, thereby make this circuit export incremental stabilized voltage supply, to satisfy the required electric current of voltage regulation of subsequent conditioning circuit or load.
In the present embodiment, incremental unit 100 comprises the first filter capacitor C1, biasing resistor R1 and transistor Q1.Voltage regulation unit 200 comprises three terminal regulator U1, input filter capacitor C3 and output filter capacitor C4.
The first filter capacitor C1, one end links to each other other end ground connection with power input is anodal.The emitter E of transistor Q1 links to each other with 1 end of biasing resistor R1, and its tie point links to each other with power input is anodal again; The base stage B of transistor Q1 links to each other with 2 ends of biasing resistor R1, and its tie point links to each other with the current input terminal of three terminal regulator U1 again; The collector C of transistor Q1 links to each other with the current output terminal of three terminal regulator U1, and its tie point links to each other with power output end again.Wherein, transistor Q1 is a PNP transistor.
In addition, the current input terminal of three terminal regulator U1 links to each other with the end of input filter capacitor C3, the other end ground connection of input filter capacitor C3; The current output terminal of three terminal regulator U1 links to each other with the end of output filter capacitor C4, the other end ground connection of output filter capacitor C4; The earth terminal ground connection of three terminal regulator U1.Wherein, the model of this three terminal regulator U1 is 78 series types or LM317 type, adopts 7805 in the present embodiment.
The incremental voltage stabilizing of this circuit realizes that principle is as follows:
Above-mentioned current increasing and voltage stabilizing circuit inserts linear voltage dropping power supply, after its power input input voltage vin, the electric current of biasing resistor R1 of flowing through is Ir, the electric current of the transistor Q1 emitter E of flowing through is Ie, the electric current of base stage B is Ib, and the electric current of collector C is Ic, and the electric current that flows into three terminal regulator U1 input end is Iin, the electric current of output terminal is Ixx, and the electric current of earth terminal is Ig; The output current of current increasing and voltage stabilizing circuit is Io, and output voltage is Vout.Adopt linear power supply not have Electro Magnetic Compatibility (Electromagnetic Compatibility is called for short EMC) problem.Expansion stream effect below in conjunction with concrete example explanation circuit.Wherein, transistor is TIP32C, and three terminal regulator U1 is 7805.
The output circuit Io=Ixx+Ic (1) of current increasing and voltage stabilizing circuit
Ixx＝Iin-Ig (2)
Wherein, Ig is 7805 static working current, is generally 4～8mA.
Iin＝Ir+Ib＝Ir+Ic/β (3)
Wherein, β is the current amplification factor of Q1 (TIP32C).
Ir＝Vbe/R1 (4)
Wherein, Vbe is the base-on voltage of Q1.
Can get formula (5) by formula (2) (3) (4), as follows:
Ixx＝Iin-Ig＝Ir+Ib-Ig＝Vbe/R1+Ic/β-Ig (5)
Because Ig is very little, can omit, then: Ixx=Vbe/R1+Ic/ β;
By the TIP32C handbook as can be known: Vbe=1.2V, its β is desirable 10, and establishes R1 value 22Ohm, then
Ixx＝1.2/R1+Ic/β＝1.2/22+Ic/10＝0.0545+Ic/10
Ic＝10*(Ixx-0.0545)
Get Ixx=100mA, Ic=10* (100-0.0545*1000)=455mA, then Io=Ixx+Ic=100+455=555mA;
Get Ixx=200A, Ic=10* (200-0.0545*1000)=1955mA, then Io=Ixx+Ic=200+1955=2155mA.
Can learn by aforementioned calculation, electric current after by incremental unit the linear voltage decreasing of power input input being handled carries out incremental processing, make that the output current of power output end is increased, and after the processing of voltage regulation unit, satisfied the required electric current of voltage regulation of subsequent conditioning circuit or load.
In addition, the incremental unit that adopts a biasing resistor and transistor to constitute, simple in structure, device is less, and is with low cost, and is used for linear power supply and do not have the EMC problem, is suitably for various voltage dropping power supplies and carries out incremental.
The above embodiment has only expressed several embodiment 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 domain of patent of the present invention should be as the criterion with claims.
Claims (7)
1. current increasing and voltage stabilizing circuit, it is characterized in that, comprise incremental unit and be electrically connected with described incremental unit and the voltage regulation unit of regulated output voltage is provided, described incremental unit comprises biasing resistor and transistor again, described biasing resistor is electrically connected between the anodal and described transistorized base stage of described power input, and described biasing resistor is electrically connected with the input end of described voltage regulation unit with tie point between the described transistorized base stage; Described transistorized emitter is connected in the power input positive pole of this current increasing and voltage stabilizing circuit, and described transistorized collector is connected in the output terminal of described voltage regulation unit.
2. current increasing and voltage stabilizing circuit according to claim 1, it is characterized in that, described incremental unit also comprises first filter capacitor, described first filter capacitor, one end is electrically connected with tie point between described biasing resistor and the power input positive pole, the other end is connected with described power input negative electricity, and tie point ground connection.
3. current increasing and voltage stabilizing circuit according to claim 1 and 2 is characterized in that, described transistor is a PNP transistor.
4. current increasing and voltage stabilizing circuit according to claim 1, it is characterized in that, described voltage regulation unit comprises three terminal regulator, the input end of described three terminal regulator is electrically connected with the tie point of described biasing resistor and transistor base, the output terminal of described three terminal regulator is electrically connected with described transistorized collector, the earth terminal ground connection of described three terminal regulator.
5. current increasing and voltage stabilizing circuit according to claim 4 is characterized in that described voltage regulation unit also comprises input filter capacitor and output filter capacitor, and described input filter capacitor is connected between the input end and ground of described three terminal regulator; Described output filter capacitor is connected between the output terminal and ground of described three terminal regulator.
6. current increasing and voltage stabilizing circuit according to claim 4 is characterized in that, the model of described three terminal regulator is 78 series types.
7. current increasing and voltage stabilizing circuit according to claim 4 is characterized in that, the model of described three terminal regulator is the LM317 type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102141275A CN101887281A (en) | 2010-06-29 | 2010-06-29 | Current increasing and voltage stabilizing circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102141275A CN101887281A (en) | 2010-06-29 | 2010-06-29 | Current increasing and voltage stabilizing circuit |
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| CN101887281A true CN101887281A (en) | 2010-11-17 |
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| CN2010102141275A Pending CN101887281A (en) | 2010-06-29 | 2010-06-29 | Current increasing and voltage stabilizing circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103616921A (en) * | 2013-11-27 | 2014-03-05 | 苏州贝克微电子有限公司 | Control circuit of low-pressure-drop voltage stabilizer |
| CN104049660A (en) * | 2013-03-15 | 2014-09-17 | 深圳市海洋王照明工程有限公司 | Low drop-out voltage stabilizing circuit and electronic equipment |
| CN109471484A (en) * | 2018-12-18 | 2019-03-15 | 山东超越数控电子股份有限公司 | A kind of self-adaptive current output low pressure difference linear voltage regulator |
| CN110165889A (en) * | 2019-05-21 | 2019-08-23 | 珠海英搏尔电气股份有限公司 | A kind of low dropout voltage regulator device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5025203A (en) * | 1989-10-02 | 1991-06-18 | Motorola, Inc. | Circuit for use with a voltage regulator |
| US5274323A (en) * | 1991-10-31 | 1993-12-28 | Linear Technology Corporation | Control circuit for low dropout regulator |
| CN201392483Y (en) * | 2009-03-06 | 2010-01-27 | 惠州三华工业有限公司 | Voltage reducing type voltage stabilizing circuit |
| CN201477462U (en) * | 2009-08-27 | 2010-05-19 | 青岛海信电器股份有限公司 | Expansive flows steady voltage circuit and television with expansive flows steady voltage circuit |
-
2010
- 2010-06-29 CN CN2010102141275A patent/CN101887281A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5025203A (en) * | 1989-10-02 | 1991-06-18 | Motorola, Inc. | Circuit for use with a voltage regulator |
| US5274323A (en) * | 1991-10-31 | 1993-12-28 | Linear Technology Corporation | Control circuit for low dropout regulator |
| CN201392483Y (en) * | 2009-03-06 | 2010-01-27 | 惠州三华工业有限公司 | Voltage reducing type voltage stabilizing circuit |
| CN201477462U (en) * | 2009-08-27 | 2010-05-19 | 青岛海信电器股份有限公司 | Expansive flows steady voltage circuit and television with expansive flows steady voltage circuit |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104049660A (en) * | 2013-03-15 | 2014-09-17 | 深圳市海洋王照明工程有限公司 | Low drop-out voltage stabilizing circuit and electronic equipment |
| CN103616921A (en) * | 2013-11-27 | 2014-03-05 | 苏州贝克微电子有限公司 | Control circuit of low-pressure-drop voltage stabilizer |
| CN109471484A (en) * | 2018-12-18 | 2019-03-15 | 山东超越数控电子股份有限公司 | A kind of self-adaptive current output low pressure difference linear voltage regulator |
| CN110165889A (en) * | 2019-05-21 | 2019-08-23 | 珠海英搏尔电气股份有限公司 | A kind of low dropout voltage regulator device |
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Application publication date: 20101117 |