CN107425719A - A kind of power supply changeover device - Google Patents
A kind of power supply changeover device Download PDFInfo
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- CN107425719A CN107425719A CN201710839577.5A CN201710839577A CN107425719A CN 107425719 A CN107425719 A CN 107425719A CN 201710839577 A CN201710839577 A CN 201710839577A CN 107425719 A CN107425719 A CN 107425719A
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- China
- Prior art keywords
- voltage
- power supply
- supply changeover
- changeover device
- voltage regulator
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0025—Arrangements for modifying reference values, feedback values or error values in the control loop of a converter
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0045—Converters combining the concepts of switch-mode regulation and linear regulation, e.g. linear pre-regulator to switching converter, linear and switching converter in parallel, same converter or same transistor operating either in linear or switching mode
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/1566—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators with means for compensating against rapid load changes, e.g. with auxiliary current source, with dual mode control or with inductance variation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention discloses a kind of power supply changeover device, the power supply changeover device is made up of the DC DC converters of prime and the linear voltage regulator cascade of rear class, the DC DC converters receive a current sampling signal for being used to characterize load current size, it is superimposed with the first predetermined reference voltage and obtains a reference signal, and medium voltage is generated according to the reference signal；The linear voltage regulator receives the medium voltage, so that the difference of the input voltage of the linear voltage regulator and output voltage is not less than the differential pressure requirements of linear voltage regulator.Pass through change of the current sampling circuit to DC DC converter feedback load electric currents, and then adjust the medium voltage, it is final make it that the pressure difference of linear voltage regulator and load current are linear, so as to reduce the waste of the extra power consumption in underloading, high efficiency conversion of the linear voltage regulator in full-load range is realized.
Description
Technical field
The present invention relates to technical field of power management, and in particular to a kind of power supply changeover device.
Background technology
In order to meet increasingly complicated electronic product power source demand, more efficient power conversion is realized, as shown in figure 1, logical
After often low pressure difference linear voltage regulator (LDO) level being associated in into DC-DC converter, make full use of its stability high, good reliability,
The advantages that cost is relatively low provides power supply output in the product, greatly extends the service life of battery.
In LDO circuit, Dropout voltages are that the minimum input and output voltage for referring to export LDO voltage stabilizations is poor,
Certain Dropout voltages are needed to ensure to adjust the amplification region that pipe is operated in high-gain during usual LDO normal works, such as Fig. 2 institutes
Show, Dropout voltages are normally provided as one and are more than maximum load pressure difference VdropmaxFixed value, and when load it is smaller when,
This pressure difference is more than sufficient, and extra power consumption can be caused to cause whole efficiency to reduce.
The content of the invention
In view of this, the invention provides a kind of power supply changeover device, to solve in the prior art, fixed Dropout electricity
Extra power consumption is caused when being pressed in underloading, the problem of causing efficiency to reduce.
The application provides a kind of power supply changeover device, the power supply changeover device by prime DC-DC converter and rear class
Linear voltage regulator cascade is formed；
The reference signal of the DC-DC converter is obtained by the first predetermined reference voltage and current sampling signal superposition
, the current sampling signal is used for the size for characterizing load current, and the DC-DC converter generates according to the reference signal
Medium voltage；
The linear voltage regulator receives the medium voltage, so that the input voltage of the linear voltage regulator and output
Difference in voltage is not less than the differential pressure requirements of linear voltage regulator.
Preferably, an adjustment transistor and current sampling circuit, the current sample electricity are included in the linear voltage regulator
The electric current that the adjustment transistor is flowed through on road by sampling obtains the current sampling signal, and one end of the adjustment transistor
It is connected to the output end of the power supply changeover device.
Preferably, the linear voltage regulator also includes the second error amplifier, and one of second error amplifier is defeated
Enter the feedback signal that end receives the output voltage of the power supply changeover device, another input receives the second reference voltage, and produces
Second error amplification signal goes to drive the adjustment transistor.
Preferably, the DC-DC converter includes power stage circuit, the first error amplifier and feedback gain circuit,
One input of first error amplifier receives the reference signal, and another input receives the DC-DC converter
The feedback signal of the medium voltage of output.
Preferably, the feedback gain circuit receives the medium voltage, after being multiplied by the first predetermined gain
Obtain the feedback signal of the medium voltage.
Preferably, the first predetermined gain is configured as meeting to cause the medium voltage and the output voltage
Difference is not less than the differential pressure requirements of the linear voltage regulator.
Preferably, the difference of the input voltage of the linear voltage regulator and output voltage and the size of the load current are into just
Dependency relation.
Power supply changeover device provided by the invention cascades structure by the DC-DC converter of prime and the linear voltage regulator of rear class
Into the DC-DC converter receives a current sampling signal for being used to characterize load current size, by itself and the first predetermined ginseng
Examine voltage superposition and obtain a reference signal, and medium voltage is generated according to the reference signal；The linear voltage regulator receives institute
Medium voltage is stated, so that the difference of the input voltage of the linear voltage regulator and output voltage is not less than the pressure of linear voltage regulator
Difference requires.By change of the current sampling circuit to DC-DC converter feedback load electric current, and then the medium voltage is adjusted,
It is final make it that the pressure difference of linear voltage regulator and load current are linear, so as to reduce the wave of the extra power consumption in underloading
Take, realize high efficiency conversion of the linear voltage regulator in full-load range.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
The embodiment of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing of offer obtains other accompanying drawings.
Fig. 1 is a kind of circuit structure diagram of power supply changeover device of the prior art；
Fig. 2 is Dropout voltages in the power supply changeover device of prior art and load current IOGraph of relation；
Fig. 3 is the circuit block diagram of the power supply changeover device according to embodiments of the invention one；
Fig. 4 is the particular circuit configurations figure of the power supply changeover device according to embodiments of the invention two；
Fig. 5 is the power supply changeover device medium voltage V according to embodiments of the invention twoPREWith load current IOThe song of change
Line chart；
Fig. 6 is the pressure difference Vd and load current I according to linear voltage regulator in the power supply changeover device of prior art and the present inventionO
Relation contrast curve.
Embodiment
Below based on embodiment, present invention is described, but the present invention is not restricted to these embodiments.Under
It is detailed to describe some specific detail sections in the literary detailed description to the present invention.Do not have for a person skilled in the art
The description of these detail sections can also understand the present invention completely.In order to avoid obscuring the essence of the present invention, known method, mistake
The not narration in detail of journey, flow, element and circuit.
In addition, it should be understood by one skilled in the art that provided herein accompanying drawing be provided to explanation purpose, and
What accompanying drawing was not necessarily drawn to scale.
It will also be appreciated that in the following description, " circuit " refers to be passed through by least one element or sub-circuit electric
The galvanic circle that connection or electromagnetism connect and compose." connected when claiming element or another element of circuit " being connected to " or element/circuit
" between two nodes when, it can directly be coupled or be connected to another element or there may be intermediary element, element it
Between connection can be physically, in logic or its combination.On the contrary, " connect when title element " being directly coupled to " or directly
Be connected to " another element when, it is meant that intermediary element is not present in both.
Unless the context clearly requires otherwise, otherwise entire disclosure is similar with the " comprising " in claims, "comprising" etc.
Word should be construed to the implication included rather than exclusive or exhaustive implication；That is, it is containing for " including but is not limited to "
Justice.
In the description of the invention, it is to be understood that term " first ", " second " etc. are only used for describing purpose, without
It is understood that to indicate or implying relative importance.In addition, in the description of the invention, unless otherwise indicated, the implication of " multiple "
It is two or more.
The invention will be further described with reference to the accompanying drawings and examples.
With reference to figure 3 be according to embodiments of the invention one power supply changeover device circuit block diagram, the power supply changeover device by
Two-stage power-switching circuit forms, including the linear voltage regulator 32 of the DC-DC converter 31 of prime and rear class, and the DC-DC becomes
Parallel operation 31 and the cascade Connection of linear voltage regulator 32.The reference signal of the DC-DC converter 31 is by the first predetermined reference
Voltage and a current sampling signal VloadSuperposition obtains, wherein, the current sampling signal VloadFor characterizing load current IO's
Size, the DC-DC converter 31 receive a d. c. voltage signal VIN, according to the reference signal, it is converted among one
Voltage VPRE, the linear voltage regulator 32 receives the medium voltage VPRE, it is converted into a stable output voltage VO, pass through
The DC-DC converter 31 adjusts medium voltage VPRESize so that the input voltage of the linear voltage regulator 32 and defeated
Go out the differential pressure requirements that difference in voltage is not less than linear voltage regulator.
It can be seen from embodiment provided by the invention, the DC-DC converter 31 can be selected to boost, is depressured, buck
Any one in topology, as long as DC-DC converter can utilize inductive energy storage, realizes highest power supply conversion efficiency, and unlimited
In the buck convertor disclosed in the present embodiment.
It is the particular circuit configurations figure of the power supply changeover device according to embodiments of the invention two with reference to shown in figure 4.It is described
DC-DC converter 41 specifically includes the first error amplifier EA1, PWM circuit 411, and power stage circuit 412 and first is anti-
Feedforward gain circuit 413, the first input end (for example, in-phase input end) of the first error amplifier EA1 are received by predetermined
First reference voltage VREF1With the current sampling signal VloadThe reference signal V generated after superpositionREF, the second input (for example,
Inverting input) receive the feedback signal V of the medium voltage that first feedback gain circuit 413 exportsFB1, the first error puts
Big device EA1 output end exports the first error amplification signal VEA1, the first error amplification signal VEA1Pass through PWM circuit 411
And then the power stage circuit 412 is controlled, wherein, first feedback gain circuit 413 receives the DC-DC converter 41
Output end medium voltage VPRE, and generate the feedback signal V of medium voltageFB1。
The linear voltage regulator 42 specifically includes current sampling circuit 421, adjusts transistor Q1, the second error amplifier
EA2, the second feedback gain circuit 422 and output capacitance C2.It is brilliant that the current sampling circuit 421 is connected in the adjustment in parallel
Between body pipe Q1 first end and the second end, the first end of the adjustment transistor Q1 is connected to the DC-DC converter 41
Output end, the second end are connected to the first end of the output capacitance C2, and the second end of the output capacitance C2 is grounded, and described second
Error amplifier EA2 first input end (for example, inverting input) receives the second reference voltage VREF2, the second input (example
Such as, in-phase input end) receive the second feedback gain circuit 422 output output voltage feedback signal VFB2, output end is connected to
The control terminal of the adjustment transistor Q1, wherein, second feedback gain circuit 422 receives the defeated of the linear voltage regulator 42
Go out voltage VO, and generate the feedback signal V of output voltageFB2。
In the present embodiment, exemplified by adjusting transistor Q1 and be p-type metal-oxide-semiconductor, the first end of the adjustment transistor Q1 is
Source S, the second end are drain D, and control terminal is grid G.Certainly, those skilled in the art can also use other conventional devices,
Such as the device such as N-type metal-oxide-semiconductor, BJT replaces p-type metal-oxide-semiconductor, make some simple adaptability conversion to circuit and realize same work(
Energy.
The operation principle of the DC-DC converter 41 is：As load current IOWhen changing, current sampling circuit 421
The load current of sampling is converted into current sampling signal Vload, and with the first predetermined reference voltage VREF1Institute is inputted after superposition
The first error amplifier EA1 in-phase input end is stated, while the first feedback gain circuit 413 receives the medium voltage VPRE, lead to
Cross the feedback signal V for being multiplied by and the medium voltage being obtained after the first predetermined gain beta 1FB1, and it is inputted described first
Error amplifier EA1 inverting input, the first error amplifier EA1 export the first error after carrying out application condition amplification
Amplified signal VEA1, the first error amplification signal VEA1Controlled by PWM circuit 411 in the power stage circuit 412
Power switch pipe M1 and power rectification pipe M2, the power switch pipe M1 and the power rectification pipe M2 by duty cycle signals control
Alternate conduction processed, continuous inductive current is produced, stable medium voltage V is exported after being filtered by output capacitance C1PRE。
In the present embodiment, so that power rectification pipe M2 is N-type metal-oxide-semiconductor as an example, certainly, those skilled in the art can also adopt
N-type metal-oxide-semiconductor is replaced with other conventional devices, such as diode, makees some simple adaptability conversion to circuit and realizes same
Function.
The operation principle of the linear voltage regulator 42 is：When loading increase, output voltage VODecline, then it is anti-by second
The feedback signal V for the output voltage that feedforward gain circuit 422 obtainsFB2Also can decline, now, the feedback signal of the output voltage
VFB2Less than the second reference voltage VREF2, so as to the second error amplification signal V of the second error amplifier EA2 outputEA2Make tune
Whole transistor Q1 grid voltage declines, i.e. VGSAbsolute value rise (adjustment transistor is PMOS), because of VIN=-VDS+VO,
Then-VDSIncrease, adjustment transistor Q1 conducting depth are increased, and bigger electric current is driven by adjusting transistor Q1, defeated to ensure
Go out voltage VOGradually recover, before error is not up to zero, adjustment transistor Q1 grid voltage may proceed to decline, until error
Adjustment terminates when being zero.On the contrary, work as output voltage VODuring more than required setting value, the driving electricity of adjustment transistor Q1 outputs
Stream reduces, so that output voltage VOReduce.
The operation principle of power supply changeover device：As load current IOIncrease, the current sampling signal VloadIncrease, then institute
State the reference signal V of DC-DC converter 41REFAlso increase therewith, if the value of the first predetermined gain beta 1 gives, reference signal
VREFWith the feedback signal V of medium voltageFB1Difference increase, the first error amplifier EA1 passes through PWM after error is amplified
Circuit 411, and then power switch pipe M1 gate source voltage increase is controlled, inductance L electric current increase is flowed through, then DC-DC converter
The medium voltage V of 41 outputsPREIncrease, i.e. medium voltage VPREWith load current IOIncrease and increase, according to described linear steady
Knowable to the operation principle of depressor 42, output voltage VOA stable constant pressure value, therefore the pressure difference Vd of linear voltage regulator can be remained
Can be with load current IOIncrease and increase.On the contrary, work as load current IODuring reduction, the current sampling signal VloadReduce,
The reference signal V of the DC-DC converter 41REFAlso decrease, if the value of the first predetermined gain beta 1 gives, with reference to letter
Number VREFWith the feedback signal V of medium voltageFB1Difference reduce, then the first error amplifier EA1 carry out application condition amplification
After generate the first error amplification signal VEA1Reduce, the first error amplification signal VEA1Institute is controlled by PWM circuit 411
The gate source voltage for stating power switch pipe M1 in power stage circuit 412 reduces, and the electric current for flowing through inductance L reduces, then DC-DC converter
The medium voltage V of 41 outputsPREReduce, output voltage VOConstant pressure is kept, the pressure difference Vd of linear voltage regulator will reduce, then adjust
Transistor Q1 loss reduces for the product that pressure difference Vd is born at its both ends and flows through its electric current, therefore the present invention is smaller in electric current
When so that the pressure difference Vd of linear voltage regulator is relatively low, so as to reduce circuit power consumption, improves conversion efficiency.
Analysis is understood more than, the current sampling signal VloadWith load current IOIt is directly proportional, described predetermined first
Gain beta 1 is configured as meeting to cause the medium voltage VPREWith the output voltage VODifference be not less than the linear voltage stabilization
The differential pressure requirements of device 42, so current sampling signal VloadFor：
Vload=k*IO*RON*β1 (1)
Wherein, RONTo adjust conduction impedance during transistor Q1 driving voltage maximums, k is the gain of current sampling circuit；
In DC-DC converter 41, due to the presence of negative-feedback, the medium voltage VPREFor：
VPRE=(Vload+VREF1)/β 1=k*IO*RON+VREF1/β1 (2)
Similarly, in linear voltage regulator 42, the output voltage VOFor：
VO=VREF2/β2 (3)
Wherein, β 2 is the second gain of the second feedback gain circuit 422；
Preferable minimum input and output pressure difference VdropIt is to ensure that adjustment transistor Q1 is operated in critical saturation region, then has Vdrop
=VGS-VTH, the electric current for flowing through adjustment transistor Q1 is:
IO=1/2* μ * Cox*W/L*(VGS-VTH)2 (4)
Wherein, W/L be adjustment transistor Q1 raceway grooves breadth length ratio, CoxTo adjust the unit area of transistor Q1 gate oxides
Electric capacity, μ be hole mobility, VTHTo adjust transistor Q1 threshold voltage.From formula (4) as can be seen that preferable Vdrop
With load current IOIt is not linear relationship, so needing to set the minimum value V of an input and output pressure differencedropmin, set herein
First gain beta 1 causes VREF1/ β 1=VO+Vdropmin, can be obtained with reference to formula (2)：
Vdrop=VPRE-VO=Vdropmin+k*IO*RON (5)
It is assumed that load current IOA V is needed when maximumdropFor Vdropmax, can be obtained according to formula (2) (3)：
Vdropmax=k*IOmax*RON+VREF1/β1-VO (6)
Meanwhile Vdropmin=VREF1/β1-VO (7)
K=(V can be obtained with reference to formula (6) (7)dropmax-Vdropmin)/(IOmax*RON), it can be seen that k is constant, then inputs
Export pressure difference VdropWith load current IOIt is linear, and k*RONFor linearity curve slope, the point of interface of linearity curve and y-axis
For Vdropmin, adjust VdropminValue may be such that the pressure difference Vd of the linear voltage regulator in whole loading range is both greater than preferable
VdropVoltage, that is, adjust the first predetermined gain beta 1 and cause the medium voltage VPREWith the output voltage VODifference not
Less than the differential pressure requirements of the linear voltage regulator.
It is the power supply changeover device medium voltage V according to the embodiment of the present invention with reference to shown in figure 5PREWith load current IOChange
Curve map.When load goes to heavy duty from underloading, output voltage VOKeep stable, medium voltage VPRELinear increase, so as to protect
The pressure difference Vd of linear voltage regulator has been demonstrate,proved with load current IOIncrease it is linearly increasing.
With reference to shown in figure 6, be according to prior art and the present invention power supply changeover device in linear voltage regulator pressure difference Vd and
Load current IORelation contrast curve.Because prior art Dropout voltages are a fixed values, in underloading, its
Far above preferable minimum Dropout voltages, and the pressure difference Vd of the linear voltage regulator of the embodiment of the present invention and load current IOIt is in
Linear relationship, and very close to preferable Dropout voltages, so as to reduce the waste of the extra power consumption in underloading, realize
Linear voltage regulator high efficiency in full-load range is changed.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for those skilled in the art
For, the present invention can have various changes and change.All any modifications made within spirit and principles of the present invention, it is equal
Replace, improve etc., it should be included in the scope of the protection.
Claims (7)
1. a kind of power supply changeover device, the power supply changeover device is by the DC-DC converter of prime and the linear voltage regulator level of rear class
Connection is formed, it is characterised in that：
The reference signal of the DC-DC converter is obtained by the first predetermined reference voltage and current sampling signal superposition, institute
The size that current sampling signal is used to characterize load current is stated, the DC-DC converter generates middle according to the reference signal
Voltage；
The linear voltage regulator receives the medium voltage, so that the input voltage and output voltage of the linear voltage regulator
Difference be not less than linear voltage regulator differential pressure requirements.
2. power supply changeover device according to claim 1, it is characterised in that an adjustment crystal is included in the linear voltage regulator
Pipe and current sampling circuit, the electric current that the current sampling circuit flows through the adjustment transistor by sampling obtain the electric current
Sampled signal, and one end of the adjustment transistor is connected to the output end of the power supply changeover device.
3. power supply changeover device according to claim 2, it is characterised in that the linear voltage regulator is also put including the second error
Big device, an input of second error amplifier receive the feedback signal of the output voltage of the power supply changeover device, separately
One input receives the second reference voltage, and produces the second error amplification signal and go to drive the adjustment transistor.
4. power supply changeover device according to claim 1, it is characterised in that the DC-DC converter includes power stage circuit,
First error amplifier and feedback gain circuit, an input of first error amplifier receive the reference letter
Number, another input receives the feedback signal of the medium voltage of the DC-DC converter output.
5. power supply changeover device according to claim 4, it is characterised in that the feedback gain circuit receives electricity among described
Pressure, the feedback signal of the medium voltage is obtained after the first predetermined gain by being multiplied by.
6. power supply changeover device according to claim 5, it is characterised in that the first predetermined gain is configured as meeting
So that the difference of the medium voltage and the output voltage is not less than the differential pressure requirements of the linear voltage regulator.
7. power supply changeover device according to claim 1, it is characterised in that the input voltage of the linear voltage regulator and output
The size of difference in voltage and the load current is into positive correlation.
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| CN201710839577.5A CN107425719B (en) | 2017-09-18 | 2017-09-18 | Power converter |
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|---|---|---|---|
| CN201710839577.5A CN107425719B (en) | 2017-09-18 | 2017-09-18 | Power converter |
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| CN109802562A (en) * | 2019-03-22 | 2019-05-24 | 北京集创北方科技股份有限公司 | Voltage-regulating system |
| CN109802563A (en) * | 2019-03-22 | 2019-05-24 | 北京集创北方科技股份有限公司 | Voltage-regulating system |
| CN110071629A (en) * | 2019-06-05 | 2019-07-30 | 恒信大友（北京）科技有限公司 | A kind of high-precision low noise power supply design method |
| CN110941322A (en) * | 2019-12-06 | 2020-03-31 | 苏州浪潮智能科技有限公司 | Method and system for optimizing server power supply |
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| CN112152422A (en) * | 2019-06-28 | 2020-12-29 | 亚德诺半导体国际无限责任公司 | Linear stage efficiency techniques for H-bridge systems |
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