CN1667536A - Linear Regulator Circuit with Adjustable Power Distribution - Google Patents
Linear Regulator Circuit with Adjustable Power Distribution Download PDFInfo
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- CN1667536A CN1667536A CN 200410039938 CN200410039938A CN1667536A CN 1667536 A CN1667536 A CN 1667536A CN 200410039938 CN200410039938 CN 200410039938 CN 200410039938 A CN200410039938 A CN 200410039938A CN 1667536 A CN1667536 A CN 1667536A
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Abstract
The invention relates to a linear voltage stabilizing circuit capable of adjusting power distribution. The linear voltage stabilizing circuit is connected between a signal input end and a signal output end and is used for regulating the input voltage of the signal input end and outputting stable regulated voltage by the signal output end, and the linear voltage stabilizing circuit comprises at least two linear voltage stabilizers connected in series and a power distribution circuit. The linear voltage stabilizer is connected between the signal input end and the signal output end, can adjust the input voltage in a power consumption mode and provides stable output voltage, and the power distribution circuit is also connected between the signal input end and the signal output end and is used for controlling the power consumption of each linear voltage stabilizer.
Description
Technical field
The present invention is relevant for a kind of linear voltage-stabilizing circuit, but particularly a kind of elasticity is adjusted the linear voltage-stabilizing circuit of power division.
Background technology
Continuous progress along with manufacture of semiconductor, integrated circuit designs towards the power saving direction of low-voltage always, but the complexity of wafer constantly increases, required supplied amount of current is also to the stage that allows the people be left speechless, with CPU, Pentium II needs 14.2A, and Pentium w/MMX needs 5.7A, and the demand of AMD K6-233 is also up to 9.5A.From as can be known above-mentioned, though the design of low-voltage is arranged, but the work kenel of high electric current makes power consumption also increase fast, power supply supply design traditionally has inner resistance to come the linear voltage regulator (linear regulator) of step-down, and, obtain the switch type voltage stabilizer (switching mode regulator) of different output voltages and electric current by the switching time of adjusting power circuit.Though though the switch type voltage stabilizer has higher power conversion efficiency, but, add under the considering of layout on the motherboard (layout) area, therefore owing to be subject to cost price in the PC industry, in the design of power supply supply, get rid of the switch type voltage stabilizer mostly, and adopt linear voltage regulator.
Shown in the 1st figure, be the circuit diagram of known linear voltage stabilizer (linear regulator), comprise a bleeder circuit 10, one comparers 12 and a npn two-carrier transistor Q1.Wherein, resistance R 1 on the bleeder circuit 10, R2 utilize voltage source Vcc to produce a preset reference voltage Vref, be connected to the positive input terminal of comparer 12 again, wherein the setting of this preset reference voltage value is the output voltage values of predetermined voltage stabilizing, output voltage V out then feedbacks to the negative input end of comparer 12, the collector of npn transistor Q1 connects signal input part Vin, and base stage is the output terminal that connects comparer 12, and the emitter-base bandgap grading of Q1 then is signal output part Vout and links a load capacitance CL.When the output voltage of output end vo ut during less than reference voltage Vref, comparer 12 outputs one high-potential voltage turn-on transistor Q1 improves with the voltage potential that provides electric current to make output end vo ut; If the output voltage of output end vo ut is during greater than reference voltage Vref, close transistor Q1 by comparer 12 outputs one low-potential voltage, the output voltage for the treatment of output end vo ut is during less than reference voltage, and just turn-on transistor Q1 again makes output voltage V out keep mobile equilibrium.
But, the major defect of linear voltage regulator is that power conversion efficiency is relatively poor, calculate its power attenuation Ploss=(Vin-Vout) * Iout with foregoing circuit, the loss of power almost completely is consumed on the transistor Q1, make that transistor Q1 just needs to select to bear more powerful component specification, but as, therefore can make cost high because the expense of high-capacity transistor is higher.And, be in for a long time when element under the situation of high capacity, relative, the element fiduciary level certainly will be affected, and causes the element or the minimizing in circuit life-span.In addition, because converting the form of heat energy to, the power train of loss disperses, it is the mode of operation that also can influence other elements of adjacent domain with the high heat that single area produces, particularly when using high-capacity transistor, the amplitude that the temperature of near zone rises is often quite big, the inhomogeneous problem that linear voltage regulator can not be ignored that also becomes of hereat dispelling the heat.
Because above-mentioned shortcoming, traditional design can be adopted series system power attenuation is scattered on two or more power components, as shown in Figure 2, increase by a diode D1, by power consumption PD1_loss across diode D1, to reduce the loss power load of transistor Q1, make the overall power dissipation of linear voltage regulator become Ploss=PD1_loss+PQ1_loss, and PD1_loss=VD1 * Iout, PQ1_loss=(Vin-VD1-Vout) * Iout, transistor Q1 can select lower power component thus, and reaches the effect that reduces cost.But, above-mentioned way still has shortcoming, and the power that promptly is consumed in diode D1 is fixed, so the consumption major part of power still is dependent on transistor Q1 and reaches, and is not remarkable for the effect of disperseing power attenuation.In view of this, adjust the linear voltage-stabilizing apparatus that power consumption is distributed, and then increase the elasticity of circuit layout and help the lifting of element fiduciary level but the present invention proposes a kind of elasticity.
Summary of the invention
Purpose of the present invention is for providing a kind of design of linear voltage-stabilizing circuit.
A further object of the present invention is adjusted the linear voltage-stabilizing circuit of power division for but a kind of elasticity is provided.
The invention provides the linear voltage-stabilizing circuit that a kind of adjustable power is distributed, this linear voltage-stabilizing circuit is linked between a signal input part and the signal output part, be used for the input voltage of this signal input part is downgraded, and export the stable voltage that downgrades by signal output part.This linear voltage-stabilizing circuit comprises, the linear voltage regulator of at least two series connection, a power distributing circuit.Wherein each linear voltage regulator also comprises a power transistor and a comparer, comparer is according to the size of the output voltage values and the reference voltage level of power transistor, and whether determine the conducting power transistor, when the power transistor conducting, can reduce input voltage in the power consumption mode.Power distributing circuit also is linked between signal input part and signal output part, resistor by at least two series connection constitutes, wherein each resistor is corresponding to a linear voltage regulator, in order to the pressure drop size of control linear voltage regulator, and then control is consumed in the power division ratio of linear voltage regulator power component.
For further specifying above-mentioned purpose of the present invention, design feature and effect, the present invention is described in detail below with reference to accompanying drawing.
Description of drawings
Fig. 1 is the circuit diagram of known linear voltage stabilizer;
Fig. 2 is the circuit diagram of another known linear voltage stabilizer;
Fig. 3 is the mu balanced circuit figure of the preferred embodiment according to the present invention;
Fig. 4 is the mu balanced circuit block diagram of the preferred embodiment according to the present invention; And
Fig. 5 is the circuit blocks figure of the series multistage voltage stabilizing element of design according to the present invention.
Embodiment
Linear voltage-stabilizing circuit of the present invention is to connect with multistage linear voltage regulator series connection (cascade), and by the element on the power distributing circuit, to control the pressure drop of its corresponding linear voltage regulator, reaches the purpose of the power consumption of control linear voltage regulators at different levels.Below enumerate a most preferred embodiment now with explanation the present invention, right those of ordinary skill in the art know that this only is one for example, and are not in order to limit invention itself.The detailed description of relevant this most preferred embodiment is as follows.
At first, see also shown in Figure 3, linear voltage-stabilizing circuit according to the adjustable power that a preferred embodiment of the present invention disclosed is distributed is linked between a signal input part Vin and the signal output part Vout, is used for the input voltage of input end is downgraded, and by output terminal output stable downgrade voltage, this linear voltage-stabilizing circuit comprises, a bleeder circuit 18, the first linear voltage regulators 20, second linear voltage regulator 22, and a power distributing circuit 24.Bleeder circuit 18 comprises first resistance R 3 and second resistance R 4 of series connection, wherein the head end of first resistance R 3 connects certain voltage source Vcc, the tail end of second resistance R 4 is ground connection then, the node place and the head end of the tail end of first resistance R 3 and second resistance R 4 joins, then produce first reference voltage Vref 1, and, its magnitude of voltage is set in the predetermined output voltage value of signal output part Vout by the resistance value of setting resistance R 3, R4.
First linear voltage regulator 20 comprises first comparer 201 and the first transistor Q2, the positive input terminal of first comparer 201 wherein, be connected to above-mentioned bleeder circuit 18 to import first reference voltage Vref 1, negative input end then is connected to signal output part Vout, is connected to the base stage of the first transistor Q2 as for its output terminal.The emitter of the first transistor Q2 is connected to signal output part Vout, and its collector then is connected to the negative input end of second linear voltage regulator 22 of next stage.Therefore, when the voltage potential of signal output part Vout is lower than first reference voltage Vref 1,, improve with the voltage potential that provides electric current to make signal output part Vout by first comparer, 201 outputs, one high-potential voltage conducting the first transistor Q2; If when the voltage potential of signal output part Vout is higher than first reference voltage Vref 1, then close the first transistor Q2, use the voltage potential that reduces signal output part Vout.
Power distributing circuit 24 is connected between signal input part Vin and the signal output part Vout, formed by two resistance in series R_Q3 and R_Q2, wherein the head end of resistance R _ Q3 is connected to signal input part Vin, the tail end of resistance R _ Q2 is connected to signal output part Vout, and two resistance series connection node Vr then are connected to the positive input terminal of second linear voltage regulator 22.In addition, 22 of second linear voltage regulators comprise second comparer 221 and transistor seconds Q3, wherein the positive input terminal of second comparer 221 is connected to the two resistance in series node Vr of place of above-mentioned power distributing circuit 24, negative input end then is connected to the emitter of transistor seconds Q3, the output terminal of comparer then is connected to the base stage of transistor seconds Q3, the collector of transistor seconds Q3 is connected to signal input part Vin, and its emitter then is connected to the collector of the first transistor Q2 of upper level first linear voltage regulator 20.Wherein second linear voltage regulator 22 is by second comparer 221 voltage of Vr and Vq relatively, with the conducting of controlling transistor seconds Q3 whether, be able to voltage with Vr and Vq be adjusted to be close to identical.Adopt the two-carrier transistor in the wherein above-mentioned preferred embodiment; also can select the transistor of metal-oxide half field effect transistor as above-mentioned control; in addition; between the negative input end and its output terminal of above-mentioned comparer; regular meeting adds one group of compensating resistance, electric capacity (not shown), to avoid the instability of output voltage.
By Fig. 4 obviously as can be known, power distributing circuit 24 is in parallel with second linear voltage regulator 22 and first linear voltage regulator 20, seeing through second comparer 221 again makes the voltage of node Vr and Vq equate, so the pressure drop on resistance R _ Q3 and the R_Q2 will be equal to the pressure drop on transistor seconds Q3 and the first transistor Q2, make overall power dissipation Ptotal_loss=(the Vin-Vout) * Iout of this linear voltage-stabilizing circuit, also because the electric current on flow through resistance in series R_Q3 and the R_Q2 is very little, make output current Iout flow through no better than the series connection transistor seconds Q3 and the electric current on the first transistor Q2, so that the overall power dissipation Ptotal_loss=PQ3_loss+PQ2_loss of circuit, the transistor Q3 of series connection and the power attenuation of Q2 then are respectively PQ3_loss=Ptotal_loss * [R_Q3/ (R_Q3+R_Q2)] and PQ2_loss=Ptotal_loss * [R_Q2/ (R_Q3+R_Q2)], so, by each resistance value of adjusting on the power distributing circuit 24, can reach the loss power of adjusting linear voltage-stabilizing circuit and distribute.
The circuit blocks figure that is preferred embodiment shown in Figure 4 according to the present invention, in addition, as shown in Figure 5, also can be in the left side of node 1, cooperate the collocation of linear voltage regulator, series connection (cascade) becomes more multistage linear voltage regulator (as the trilinear voltage stabilizer 26 etc. of arranging in pairs or groups of the R_Q4 shown in scheming to go up), and the distribution of loss power determines the power attenuation of each linear voltage regulator equally according to each resistance value of series connection on the power distributing circuit 28.
Linear voltage-stabilizing circuit design according to the present invention has following advantage:
(1) distribute according to the pressure drop on the power distributing circuit, but with the power division of power component on the flexible adjustment voltage stabilizer, reducing the load value of single power component, when element often is not under the situation of high capacity, the fiduciary level of element can promote relatively.In addition, the load of element reduces, and makes the deviser can select the element of lower-wattage, reduces the purchase cost of single element.
(2) because the power attenuation of linear voltage regulator is to come dissipation with the form of heat energy, when producing the high circuit board that must see through when hot, power component dispel the heat, but by the topological design of circuit design of the present invention with other circuit of resilient engagement, suppose to distribute to the layout areas of mu balanced circuit when big, the element of higher-wattage can be designed in this zone, if layout areas hour, a then optional majority lower powered element is scattered in everywhere, the source that disperses heat energy by this, make circuit layout have more elasticity, in addition, also can avoid the mode of operation of the high heat affecting adjacent circuit elements of single element generation, promote whole fiduciary level indirectly.
Though the present invention describes with reference to current specific embodiment, but those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, under the situation that does not break away from spirit of the present invention, also can make the variation and the modification of various equivalences, therefore, as long as variation, the modification to the foregoing description all will drop in the scope of claims of the present invention in connotation scope of the present invention.
Claims (9)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100399380A CN100386705C (en) | 2004-03-11 | 2004-03-11 | Linear Regulator Circuit with Adjustable Power Distribution |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100399380A CN100386705C (en) | 2004-03-11 | 2004-03-11 | Linear Regulator Circuit with Adjustable Power Distribution |
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| Publication Number | Publication Date |
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| CN1667536A true CN1667536A (en) | 2005-09-14 |
| CN100386705C CN100386705C (en) | 2008-05-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2004100399380A Expired - Lifetime CN100386705C (en) | 2004-03-11 | 2004-03-11 | Linear Regulator Circuit with Adjustable Power Distribution |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102006532A (en) * | 2010-10-09 | 2011-04-06 | 北京昆腾微电子有限公司 | Power supply equipment, processing chip for digital microphone and digital microphone |
| CN102736655A (en) * | 2011-04-07 | 2012-10-17 | 鸿富锦精密工业（深圳）有限公司 | Linear voltage stabilizing circuit |
| CN103226369A (en) * | 2012-01-31 | 2013-07-31 | 富士通天株式会社 | Power circuit |
| CN106484019A (en) * | 2016-11-29 | 2017-03-08 | 合肥中感微电子有限公司 | A kind of linear voltage regulator, electric power system and pressure regulation method |
| CN108536209A (en) * | 2018-06-08 | 2018-09-14 | 洛阳嘉盛电源科技有限公司 | A kind of wide scope linear voltage-stabilizing circuit |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4253055A (en) * | 1977-02-22 | 1981-02-24 | American Optical Corporation | Adjustable switching current regulator |
| CN2136491Y (en) * | 1992-09-10 | 1993-06-16 | 陈连海 | Voltage controlled micro differential voltage linear regulated power supply |
| JP2643813B2 (en) * | 1993-12-24 | 1997-08-20 | 日本電気株式会社 | Stabilized power supply circuit |
| US5982158A (en) * | 1999-04-19 | 1999-11-09 | Delco Electronics Corporaiton | Smart IC power control |
| CN1153108C (en) * | 2000-09-06 | 2004-06-09 | 华硕电脑股份有限公司 | Linear voltage stabilizer capable of absorbing feedback current |
-
2004
- 2004-03-11 CN CNB2004100399380A patent/CN100386705C/en not_active Expired - Lifetime
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102006532A (en) * | 2010-10-09 | 2011-04-06 | 北京昆腾微电子有限公司 | Power supply equipment, processing chip for digital microphone and digital microphone |
| CN102006532B (en) * | 2010-10-09 | 2014-07-02 | 昆腾微电子股份有限公司 | Power supply equipment, processing chip for digital microphone and digital microphone |
| US8810220B2 (en) | 2010-10-09 | 2014-08-19 | Beijing Kt Micro, Ltd. | Power supply device, a processing chip for a digital microphone and related digital microphone |
| CN102736655A (en) * | 2011-04-07 | 2012-10-17 | 鸿富锦精密工业（深圳）有限公司 | Linear voltage stabilizing circuit |
| CN102736655B (en) * | 2011-04-07 | 2014-04-30 | 鸿富锦精密工业（深圳）有限公司 | Linear voltage stabilizing circuit |
| US8791745B2 (en) | 2011-04-07 | 2014-07-29 | Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd. | Linear voltage stabilizing circuit |
| CN103226369A (en) * | 2012-01-31 | 2013-07-31 | 富士通天株式会社 | Power circuit |
| CN106484019A (en) * | 2016-11-29 | 2017-03-08 | 合肥中感微电子有限公司 | A kind of linear voltage regulator, electric power system and pressure regulation method |
| CN106484019B (en) * | 2016-11-29 | 2019-05-21 | 合肥中感微电子有限公司 | A kind of linear voltage regulator, power supply system and pressure regulation method |
| CN108536209A (en) * | 2018-06-08 | 2018-09-14 | 洛阳嘉盛电源科技有限公司 | A kind of wide scope linear voltage-stabilizing circuit |
| CN108536209B (en) * | 2018-06-08 | 2023-12-22 | 洛阳嘉盛电源科技有限公司 | Wide-range linear voltage stabilizing circuit |
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| CN100386705C (en) | 2008-05-07 |
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