CN101308391B - High precision low pressure difference linear voltage-stabilizing circuit - Google Patents
High precision low pressure difference linear voltage-stabilizing circuit Download PDFInfo
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- CN101308391B CN101308391B CN2008100680480A CN200810068048A CN101308391B CN 101308391 B CN101308391 B CN 101308391B CN 2008100680480 A CN2008100680480 A CN 2008100680480A CN 200810068048 A CN200810068048 A CN 200810068048A CN 101308391 B CN101308391 B CN 101308391B
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Abstract
The invention discloses a high-precision low-dropout linear voltage-regulator circuit, which comprises a first triode (Q1), a second triode (Q2), a parallel type reference voltage generator (U1), a first current-limiting resistor (R1), a second current-limiting resistor (R2), a first divider resistor (R3), a second divider resistor (R4), a bias resistor (R5) and a first capacitor (C1). The invention makes full use of a voltage reference source and an error amplifier inside a voltage-regulator tube TL431 and needs no additional operational amplifier and other special devices, so that the invention can be simply realized with high voltage-regulator precision and good temperature characteristics. At the same time, the circuit output voltage of the invention can be easily regulated by the divider resistors R3, R4 regulation to better realize low-dropout linear voltage regulation to achieve high-performance and low-cost effects.
Description
Technical field
The present invention relates to the circuit engineering field, relate in particular to a kind of high precision low pressure difference linear voltage-stabilizing circuit.
Background technology
Low-dropout linear voltage-regulating circuit is compared with common linear voltage-stabilizing circuit has the advantage that input voltage is low, efficient is high, output current is big.Existing common linear voltage-stabilizing circuit schematic diagram as shown in Figure 1, circuit is made up of reference voltage source (Z1), voltage detecting resistance (R4, R5), error amplifier (U1) and output triode (Q2).Output voltage is compared with reference voltage behind the voltage detecting electric resistance partial pressure, and both differences are control Q2 transistor base electric current after error amplifier amplifies, thereby the conduction voltage drop of adjustment triode reaches the purpose of regulated output voltage.But existing common linear voltage-stabilizing circuit uses stabilivolt to make benchmark, have the low and temperature of precision and float big shortcoming, and input and output pressure reduction is also very big;
Fig. 2 is existing two kinds of high precision linear voltage-stabilizing circuits, uses energy gap benchmark IC to have high-precision advantage as reference voltage, but has the big deficiency of input and output pressure reduction.Circuit uses 2 NPN triodes among the figure, circuit input and output pressure reduction could be worked more than must surpassing 2V, in addition, TL431 cathode load resistance (R1) influences the open-loop gain of entire circuit, in order to obtain the high precision of voltage regulation and response speed (needing to increase R1 resistance and TL431 working current), cause circuit input and output pressure reduction further to increase, the actual use when being suitable for this circuit more than the input and output pressure reduction 5V.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of high precision low pressure difference linear voltage-stabilizing circuit.
For solving the problems of the technologies described above, the objective of the invention is to be achieved through the following technical solutions.
A kind of high precision low pressure difference linear voltage-stabilizing circuit comprises: first triode, second triode, parallel connection type pedestal generator, first current-limiting resistance, second current-limiting resistance, first divider resistance, second divider resistance, biasing resistor, first electric capacity; The emitter of the emitter of described first triode and second triode connects the positive pole of power input, and the collector of first triode links to each other with the base stage of second triode, and the collector of second triode connects power output end; The positive pole of one termination power input end of biasing resistor, the other end links to each other with the negative electrode of parallel connection type pedestal generator by second current-limiting resistance, the plus earth of parallel connection type pedestal generator, the base stage of first triode is connected the mid point of the biasing resistor and second current-limiting resistance, the collector of a termination second triode after first divider resistance is connected with second divider resistance, other end ground connection; The control utmost point of parallel connection type pedestal generator is connected the mid point of first divider resistance and second divider resistance; One end of first current-limiting resistance links to each other other end ground connection with the collector of first triode; First electric capacity is connected in parallel between the negative electrode and the control utmost point of parallel connection type pedestal generator.
Wherein, described second triode is PNP transistor or P channel mosfet pipe.
Wherein, also comprise second electric capacity, described second electric capacity is connected in parallel on power output end.
Beneficial effect of the present invention is as follows:
The present invention makes full use of stabilivolt TL431 internal reference voltage source and error amplifier, need not to add amplifier and other dedicated devices, and it is convenient to realize, precision of voltage regulation height, good temp characteristic.Simultaneously, circuit output voltage of the present invention can be by divider resistance R3, and R4 regulates, and output voltage easy to adjust can better be realized the low pressure difference linearity voltage stabilizing, reaches high-performance, Adjustable Output Voltage and effect cheaply.
Description of drawings
Fig. 1 is existing common linear voltage-stabilizing circuit schematic diagram;
Fig. 2 is existing two kinds of high precision linear voltage-stabilizing circuit schematic diagrams;
Fig. 3 is the embodiment of the invention 1 circuit theory diagrams;
Fig. 4 is the embodiment of the invention 2 circuit theory diagrams.
Embodiment
For ease of the present invention is further understood, now reach specific embodiment in conjunction with the accompanying drawings and describe the present invention.
Embodiment 1:
See also shown in Figure 3ly, comprising: the first triode Q1, the second triode Q2, parallel connection type pedestal generator (TL431) U1, the first current-limiting resistance R1, the second current-limiting resistance R2, the first divider resistance R3, the second divider resistance R4, biasing resistor R5, first capacitor C 1, second capacitor C 2, pull-up resistor RL; The emitter of the emitter of the described first triode Q1 and the second triode Q2 meets the anodal Vin+ of power input, and the collector of the first triode Q1 links to each other with the base stage of the second triode Q2, and the collector of the second triode Q2 meets power output end Vout+; The anodal Vin+ of the termination power input end of biasing resistor R5, the other end links to each other with the negative electrode of parallel connection type pedestal generator U1 by the second current-limiting resistance R2, the plus earth of parallel connection type pedestal generator U1, the base stage of the first triode Q1 is connected the mid point of the biasing resistor R5 and the second current-limiting resistance R2, the collector of a termination second triode Q2 after the first divider resistance R3 connects with the second divider resistance R4, other end ground connection; The control utmost point of parallel connection type pedestal generator U1 is connected the mid point of the first divider resistance R3 and the second divider resistance R4; The end of the first current-limiting resistance R1 links to each other other end ground connection with the collector of the first triode Q1; First capacitor C 1 is connected in parallel between the negative electrode and the control utmost point of parallel connection type pedestal generator U1, and second capacitor C 2 and pull-up resistor RL are connected in parallel on power output end respectively.
Wherein, the second triode Q2 is the PNP transistor.
Among Fig. 3, output voltage is compared with parallel connection type pedestal generator U1 internal reference voltage 2.495V after R3, R4 dividing potential drop, thereby control is flow through the electric current of parallel connection type pedestal generator U1 negative electrode and is changed the electric current that flows through the Q2 base stage, reaches the purpose of regulated output voltage.
Embodiment 2:
See also shown in Figure 4ly, its circuit theory diagrams are consistent with Fig. 3 schematic diagram, and its difference is that the second triode Q2 is a P channel mosfet pipe.
Concrete principle of work is as follows:
The electric current that flows through current-limiting resistance R1 is Q1 collector current and Q2 base current sum.When output load increases (when RL diminishes), output voltage V out reduces, the control utmost point of parallel connection type pedestal generator U1 (1 pin) voltage also can reduce, negative electrode (2 pin) voltage of being known U1 by parallel connection type pedestal generator U1 principle of work raises, the electric current that flows through R2 diminishes, thereby the Q1 collector current is diminished.Substantially remain unchanged owing to the electric current that flows through R1 equals (Vin-Vbe)/R1, so the Q2 base current increases, voltage decreases between Q2 penetrates-collects increases output voltage, reaches the purpose of voltage stabilizing.Otherwise, when output load reduces (RL become big), the adjusting by TL431 can make Q2 penetrate-collect between voltage become greatly, it is stable that output voltage also can keep.
In sum, low-dropout linear voltage-regulating circuit of the present invention is made up of a small-signal PNP triode, power P NP triode, three ends are adjustable shunting reference source TL431 and dividing potential drop and current-limiting resistance, and is with low cost.This circuit makes full use of TL431 internal reference voltage source and error amplifier, need not to add amplifier, and it is convenient to realize, precision of voltage regulation height, good temp characteristic.This circuit output voltage can be by divider resistance R3, and R4 regulates, output voltage easy to adjust.
More than a kind of low-dropout linear voltage-regulating circuit provided by the present invention is described in detail, used specific case herein principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand core concept of the present invention; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (3)
1. high precision low pressure difference linear voltage-stabilizing circuit, it is characterized in that, comprising: first triode (Q1), second triode (Q2), parallel connection type pedestal generator (U1), first current-limiting resistance (R1), second current-limiting resistance (R2), first divider resistance (R3), second divider resistance (R4), biasing resistor (R5), first electric capacity (C1); The emitter of the emitter of described first triode (Q1) and second triode (Q2) connects the positive pole (Vin+) of power input, the collector of first triode (Q1) links to each other with the base stage of second triode (Q2), and the collector of second triode (Q2) connects power output end (Vout+); The positive pole (Vin+) of one termination power input end of biasing resistor (R5), the other end links to each other with the negative electrode of parallel connection type pedestal generator (U1) by second current-limiting resistance (R2), the plus earth of parallel connection type pedestal generator (U1), the base stage of first triode (Q1) is connected the mid point of biasing resistor (R5) and second current-limiting resistance (R2), the collector of a termination second triode (Q2) after first divider resistance (R3) is connected with second divider resistance (R4), other end ground connection; The control utmost point of parallel connection type pedestal generator (U1) is connected the mid point of first divider resistance (R3) and second divider resistance (R4); One end of first current-limiting resistance (R1) links to each other other end ground connection with the collector of first triode (Q1); First electric capacity (C1) is connected in parallel between the negative electrode and the control utmost point of parallel connection type pedestal generator (U1).
2. high precision low pressure difference linear voltage-stabilizing circuit according to claim 1 is characterized in that, described second triode (Q2) is PNP transistor or P channel mosfet pipe.
3. high precision low pressure difference linear voltage-stabilizing circuit according to claim 1 and 2 is characterized in that, also comprises second electric capacity (C2), and described second electric capacity (C2) is connected in parallel on power output end.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100680480A CN101308391B (en) | 2008-06-27 | 2008-06-27 | High precision low pressure difference linear voltage-stabilizing circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100680480A CN101308391B (en) | 2008-06-27 | 2008-06-27 | High precision low pressure difference linear voltage-stabilizing circuit |
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| CN101308391A CN101308391A (en) | 2008-11-19 |
| CN101308391B true CN101308391B (en) | 2010-04-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102035163A (en) * | 2010-12-10 | 2011-04-27 | 上海诺雅克电气有限公司 | Power supply device for residual current protector |
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| CN102081418B (en) * | 2009-12-01 | 2014-07-09 | 鸿富锦精密工业（深圳）有限公司 | Linear constant voltage control circuit |
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| CN102522884B (en) * | 2011-12-19 | 2015-04-01 | 埃泰克汽车电子(芜湖)有限公司 | LDO (Low Dropout Regulator) circuit for high-input voltage |
| CN104022660A (en) * | 2014-06-24 | 2014-09-03 | 苏州塔可盛电子科技有限公司 | Voltage-reducing and voltage-stabilizing circuit |
| CN105634278A (en) * | 2016-03-21 | 2016-06-01 | 江苏峰谷源储能技术研究院有限公司 | MOSFET linear direct-current voltage-stabilizing output circuit |
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| CN109669504B (en) * | 2019-01-04 | 2020-10-27 | 西安微电子技术研究所 | TL431 application power supply line structure, voltage stabilizing method and application |
| CN110260850B (en) * | 2019-06-14 | 2023-10-10 | 哈尔滨工程大学 | High-voltage stable bias circuit of hemispherical harmonic oscillator |
| CN111665896A (en) * | 2020-06-24 | 2020-09-15 | 西安微电子技术研究所 | Controllable low-voltage-difference high-power voltage stabilizing circuit of optical isolating switch |
| CN111796621A (en) * | 2020-07-16 | 2020-10-20 | 山东超越数控电子股份有限公司 | Constant current source control method based on linear voltage stabilizer and constant current source circuit |
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| CN2786682Y (en) * | 2004-12-03 | 2006-06-07 | 广东科龙电器股份有限公司 | Accurate voltage-stabilizing circuit |
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| CN201210261Y (en) * | 2008-06-27 | 2009-03-18 | 深圳市麦格米特驱动技术有限公司 | Highly precise low voltage difference linear voltage stabilizing circuit |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2786682Y (en) * | 2004-12-03 | 2006-06-07 | 广东科龙电器股份有限公司 | Accurate voltage-stabilizing circuit |
| CN101188356A (en) * | 2006-11-21 | 2008-05-28 | 半导体元件工业有限责任公司 | Protection circuit and its method |
| CN201210261Y (en) * | 2008-06-27 | 2009-03-18 | 深圳市麦格米特驱动技术有限公司 | Highly precise low voltage difference linear voltage stabilizing circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102035163A (en) * | 2010-12-10 | 2011-04-27 | 上海诺雅克电气有限公司 | Power supply device for residual current protector |
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