CN103412603A - High performance and low voltage difference type linear voltage stabilizing circuit - Google Patents
High performance and low voltage difference type linear voltage stabilizing circuit Download PDFInfo
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- CN103412603A CN103412603A CN201310393448XA CN201310393448A CN103412603A CN 103412603 A CN103412603 A CN 103412603A CN 201310393448X A CN201310393448X A CN 201310393448XA CN 201310393448 A CN201310393448 A CN 201310393448A CN 103412603 A CN103412603 A CN 103412603A
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Abstract
The invention discloses a high performance and low voltage difference type linear voltage stabilizing circuit. The circuit is characterized by comprising a 5.5V direct current power source, a virtual ground potentiometer generator circuit, an error comparing and amplifying circuit, a resistance feedback network and a voltage stabilizing power driving circuit, wherein a virtual ground potentiometer generator C1 in the virtual ground potentiometer generator circuit adopts the type of TLE2425, and a double-operational amplifier IC2 in the error comparing and amplifying circuit adopts the type of LMC6462. A linear voltage stabilizing power source has low efficiency due to the influence by the minimum voltage difference of an adjusting tube, rectifying efficiency, transformer efficiency, grid voltage fluctuation, rectified and filtered high-amplitude ripple and the like, and the efficiency usually reaches 5 to 8V or higher. The conduction dead area of a power tube has higher voltage, and the usual voltage drop reaches 2.5 to 4V, so the linear voltage stabilizing power source cannot work at low voltage difference or super-low voltage difference. The high performance and low voltage difference type linear voltage stabilizing circuit fundamentally improves the performance of the linear voltage stabilizing power source.
Description
Technical field
The invention belongs to the stabilized voltage supply technical field, is about the linear low voltage difference mu balanced circuit of a kind of high-performance.
Background technology
Linear stabilized power supply once, with the simple structure of circuit, excellent performance, the cheap characteristics such as price, be widely applied in various electrical equipment or instrument, and the quality of linear stabilized power supply performance will directly have influence on the quality of electrical equipment or instrument performance.Along with the development of electronic technology, the problem that linear stabilized power supply exists reveals gradually.
The linear stabilized power supply major defect is that efficiency is low, and the output 5V DC voltage of take is example, and under AC supply voltage fluctuation ± 20% condition, the efficiency when supply voltage is the highest and during nominal value is respectively 27%, 33%.
The inefficient main cause of linear stabilized power supply is the impacts such as high amplitude ripple of adjusting after the minimum differntial pressure of pipe, efficiency of rectification, transformer efficiency, voltage ripple of power network, rectifying and wave-filtering, usually reaches 5～8V even higher.Power tube conducting dead band voltage is higher, and general pressure drop reaches 2.5～4V, causes linear stabilized power supply even can not work during ultra low differential pressure at low voltage difference.When working current was larger, linear stabilized power supply efficiency was lower, loss is larger; In burning voltage, will cause the variation of load current and the change of other output end voltages.Based on the above shortcoming of linear stabilized power supply, the present invention proposes the linear low voltage difference mu balanced circuit of a kind of high-performance, has fundamentally improved the performance of linear stabilized power supply.
The present invention can be very little from the larger 5.5V voltage of ripple, isolating nearly ripple, and output voltage is a little less than 5V low voltage difference burning voltage, and guaranteed that very high output is to input Ripple Suppression ability.In circuit, mainly comprise virtual ground potential device generator, error comparison amplifier and resistance-feedback network etc.
Below describe the linear low voltage difference mu balanced circuit of high-performance of the present invention related correlation technique in implementation process in detail.
Summary of the invention
Goal of the invention and beneficial effect: the inefficient main cause of linear stabilized power supply is the impacts such as high amplitude ripple of adjusting after the minimum differntial pressure of pipe, efficiency of rectification, transformer efficiency, voltage ripple of power network, rectifying and wave-filtering, usually reaches 5～8V even higher.Power tube conducting dead band voltage is higher, and general pressure drop reaches 2.5～4V, causes linear stabilized power supply even can not work during ultra low differential pressure at low voltage difference.When working current was larger, linear stabilized power supply efficiency was lower, loss is larger; In burning voltage, will cause the variation of load current and the change of other output end voltages.Based on the above shortcoming of linear linear stabilized power supply, the present invention proposes the linear low voltage difference mu balanced circuit of a kind of high-performance, has fundamentally improved the performance of linear stabilized power supply.
The circuit working principle: virtual ground potential device generator TLE2425 provides 2.5V precision offset voltage for single supply double operational LMC6462, after circuit is connected the 5.5V direct supply, circuit starts to start, constant-current source circuit provides biasing for whole circuit, the reference voltage Rapid Establishment of virtual ground potential device generator IC1, output voltage is along with input voltage constantly rises, when output voltage is about to reach setting (5V), by resistance R 1, the resistance-feedback network that resistance R 2 forms, the output feedback voltage obtained is delivered to the 2nd pin of dual operational amplifier IC2, now the error small-signal that will export between the 3rd pin of feedback voltage and dual operational amplifier IC2 of the 2nd pin of dual operational amplifier IC2 amplifies, through enhancement mode N channel field-effect pipe VT1, adjust again, when the grid G input signal of enhancement mode N channel field-effect pipe and the resistance between drain-source will constantly change, thereby formation negative feedback, guaranteed the stable of output voltage.The Main Function of electrochemical capacitor C2 is the filtering Alternating Component.In like manner, if input voltage changes or output current changes, this closed loop will make output voltage keep stablizing constant.
Technical characterictic: the linear low voltage difference mu balanced circuit of high-performance, it comprises that 5.5V direct supply, virtual ground potential device generator circuit, error ratio, than amplifying circuit, resistance-feedback network, voltage stabilizing power driving circuit, is characterized in that:
Virtual ground potential device generator circuit: the model that virtual ground potential device generator IC1 selects is TLE2425, the anodal VCC of the positive source connection circuit of virtual ground potential device generator IC1, the power cathode connection circuit ground GND of virtual ground potential device generator IC1, the reference voltage output end of virtual ground potential device generator IC1 connects error ratio than amplifying circuit;
Error ratio is than amplifying circuit: the model that dual operational amplifier IC2 selects is LMC6462, the 3rd pin of dual operational amplifier IC2 connects the reference voltage output end of virtual ground potential device generator IC1, the anodal VCC of the 5th pin connection circuit of dual operational amplifier IC2, the 4th pin connection circuit ground GND of dual operational amplifier IC2, the 2nd pin connecting resistance feedback network of dual operational amplifier IC2;
Resistance-feedback network: the end of the 2nd pin connecting resistance R1 of dual operational amplifier IC2 and an end of resistance R 2, the other end connection circuit ground GND of resistance R 1, the anodal VCC1 of another termination voltage stabilizing power driving circuit of resistance R 2;
The voltage stabilizing power driving circuit: the grid G of enhancement mode N channel field-effect pipe VT1 connects the 1st pin of dual operational amplifier IC2, the anodal VCC of the drain D connection circuit of enhancement mode N channel field-effect pipe VT1, the source S of enhancement mode N channel field-effect pipe VT1 meets the positive pole of electrochemical capacitor C2 and the anodal VCC1 of voltage stabilizing power driving circuit, the negative pole connection circuit ground GND of electrochemical capacitor C2;
5.5V the anodal VCC of DC power anode connection circuit, 5.5V DC power cathode connection circuit ground GND.
The accompanying drawing explanation
Accompanying drawing is embodiment circuit working schematic diagram of the linear low voltage difference mu balanced circuit of high-performance provided by the invention.
Embodiment
According to the linear low voltage difference mu balanced circuit fundamental diagram of high-performance shown in the drawings and accompanying drawing explanation, and according to annexation between components and parts in the described each several part circuit of summary of the invention, and the components and parts technical parameter described in embodiment requires and the circuit production main points are implemented to realize the present invention, below in conjunction with embodiment, correlation technique of the present invention is further described.
The selection of components and parts and technical parameter thereof
IC1 is virtual ground potential device generator, the model TLE2425 that circuit is selected, packing forms: TO-92;
IC2 is single supply low-power consumption dual operational amplifier, and referred to as dual operational amplifier, the model that circuit is selected is LMC6462, and the present invention only uses 1 group in dual operational amplifier;
VT1 is enhancement mode N channel field-effect pipe, the model BSSl39 that enhancement mode N channel field-effect pipe is selected;
Resistance in circuit is all used metalfilmresistor, and the resistance of resistance R 1 is 6.8K Ω; The resistance of resistance R 2 is 5.6K Ω;
C1 is electrochemical capacitor, and capacity is 1000 μ F/16V; C2 is electrochemical capacitor, and capacity is 10 μ F/10V.
Circuit production main points and circuit debugging
Relatively simple for structure because of the linear low voltage difference mu balanced circuit of high-performance, as long as the electronic devices and components performance of generally selecting is intact, and the components and parts annexation in accompanying drawing is welded to specifications, physical connection line and welding quality are after careful inspection is correct, circuit of the present invention does not need to carry out any debugging substantially, and connecting the 5.5V direct supply can work;
For the convenient debugging of circuit, the present invention can be divided into circuit 3 parts and debug respectively;
This circuit input direct voltage >=5.5V, stable output voltage are 5V, maximum output current >=2A.
Claims (1)
1. the linear low voltage difference mu balanced circuit of a high-performance, it comprises that 5.5V direct supply, virtual ground potential device generator circuit, error ratio, than amplifying circuit, resistance-feedback network, voltage stabilizing power driving circuit, is characterized in that:
The model that virtual ground potential device generator IC1 in described virtual ground potential device generator circuit selects is TLE2425, the anodal VCC of the positive source connection circuit of virtual ground potential device generator IC1, the power cathode connection circuit ground GND of virtual ground potential device generator IC1, the reference voltage output end of virtual ground potential device generator IC1 connects error ratio than amplifying circuit;
The model that described error ratio is selected than the dual operational amplifier IC2 in amplifying circuit is LMC6462, the 3rd pin of dual operational amplifier IC2 connects the reference voltage output end of virtual ground potential device generator IC1, the anodal VCC of the 5th pin connection circuit of dual operational amplifier IC2, the 4th pin connection circuit ground GND of dual operational amplifier IC2, the 2nd pin connecting resistance feedback network of dual operational amplifier IC2;
The end of the 2nd pin connecting resistance R1 of dual operational amplifier IC2 in described resistance-feedback network and an end of resistance R 2, the other end connection circuit ground GND of resistance R 1, the anodal VCC1 of another termination voltage stabilizing power driving circuit of resistance R 2;
The grid G of enhancement mode N channel field-effect pipe VT1 in described voltage stabilizing power driving circuit connects the 1st pin of dual operational amplifier IC2, the anodal VCC of the drain D connection circuit of enhancement mode N channel field-effect pipe VT1, the source S of enhancement mode N channel field-effect pipe VT1 meets the positive pole of electrochemical capacitor C2 and the anodal VCC1 of voltage stabilizing power driving circuit, the negative pole connection circuit ground GND of electrochemical capacitor C2;
The anodal VCC of described 5.5V DC power anode connection circuit, 5.5V DC power cathode connection circuit ground GND.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310393448XA CN103412603A (en) | 2013-09-02 | 2013-09-02 | High performance and low voltage difference type linear voltage stabilizing circuit |
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| CN201310393448XA CN103412603A (en) | 2013-09-02 | 2013-09-02 | High performance and low voltage difference type linear voltage stabilizing circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105099392A (en) * | 2014-05-15 | 2015-11-25 | 西安阿普莱特光电科技有限公司 | Full-frequency noise signal filter |
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| US6522111B2 (en) * | 2001-01-26 | 2003-02-18 | Linfinity Microelectronics | Linear voltage regulator using adaptive biasing |
| CN101089770A (en) * | 2006-06-15 | 2007-12-19 | 美国芯源系统股份有限公司 | Low dropout linear regulator having high power supply rejection and low quiescent current |
| CN203397252U (en) * | 2013-09-02 | 2014-01-15 | 黄月华 | High-performance linear low-dropout voltage stabilizing circuit |
-
2013
- 2013-09-02 CN CN201310393448XA patent/CN103412603A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6522111B2 (en) * | 2001-01-26 | 2003-02-18 | Linfinity Microelectronics | Linear voltage regulator using adaptive biasing |
| CN101089770A (en) * | 2006-06-15 | 2007-12-19 | 美国芯源系统股份有限公司 | Low dropout linear regulator having high power supply rejection and low quiescent current |
| CN203397252U (en) * | 2013-09-02 | 2014-01-15 | 黄月华 | High-performance linear low-dropout voltage stabilizing circuit |
Non-Patent Citations (1)
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| 新成: "一款简洁高效的低压差线性（LDO）稳压器", 《电子制作》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105099392A (en) * | 2014-05-15 | 2015-11-25 | 西安阿普莱特光电科技有限公司 | Full-frequency noise signal filter |
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Application publication date: 20131127 |