CN109802563A - Voltage-regulating system - Google Patents
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Abstract
The present invention provides a kind of voltage-regulating systems, it include: DC-to-dc converter for generating switching signal based on the feedback signal input voltage is converted into the first output voltage, feedback signal is the adjustable partial pressure ratio according to the first output voltage and generates, and DC-to-dc converter is that adjustable partial pressure ratio is determined according to ratio control signal；And voltage regulation unit, it is for the first output voltage to be changed into one second output voltage；Wherein, voltage regulation unit includes: load current state detection unit, and for generating ratio control signal according to load current to determine adjustable partial pressure ratio, and the relationship reversely changed is presented in adjustable partial pressure ratio and load current.The present invention can adjust the size for adjusting pressure difference, additionally it is possible to which the output voltage for adjusting DC-to-dc converter optimizes efficiency at light load, to improve entire voltage-regulating system in whole combined efficiency at light load.
Description
Technical field
The present invention relates to voltage regulation techniques fields, and in particular to one kind can adjust automatically pressure difference with improve overall conversion effect
The power-supply system of rate.
Background technique
In actual power applications, it is often necessary in DC-DC (direct current-direct current；Directly
Stream-direct current) one or more LDO (low dropout is cascaded after converter；Low adjustment pressure difference) linear voltage regulator, or in DC-
One or more charge pumps are cascaded after DC converter.(1-a to 1-d), wherein by DC-DC converter shown in Fig. 1-a referring to Fig.1
Power-supply management system composed by 10 cascade LDO linear voltage regulators 11；Charge pump is cascaded by DC-DC converter 10 shown in Fig. 1-b
Power-supply management system composed by 12；LDO linear voltage regulator 11 and charge pump 12 are cascaded by DC-DC converter 10 shown in Fig. 1-c
Composed power-supply management system；And multiple LDO linear voltage regulators 11 and are cascaded by DC-DC converter 10 more shown in Fig. 1-d
Power-supply management system composed by a charge pump 12；Wherein, LDO linear voltage regulator 11 and the input voltage of charge pump 12 are required to
Being higher by scheduled adjusting pressure difference (headroom or dropout) than output voltage could work normally.
As shown in Fig. 1-a, DC-DC converter 10 is used for input voltage VinChange into the first output voltage Vreg, and LDO line
Property voltage-stablizer 11 is then for by the first output voltage VregChange into the second output voltage Vldo, wherein VregV must be comparedldoIt is higher by predetermined
Adjusting pressure difference；As shown in Fig. 1-b, DC-DC converter 10 is used for input voltage VinChange into the first output voltage Vreg, and it is electric
Lotus pump 12 is then for by the first output voltage VregChange into the second output voltage Vcp, wherein VregV must be comparedcpIt is higher by scheduled tune
Save pressure difference；As shown in fig 1-c, DC-DC converter 10 is used for input voltage VinChange into the first output voltage Vreg, LDO is linearly steady
Depressor 11 is for by the first output voltage VregChange into the second output voltage Vldo, and charge pump 12 is for the first output is electric
Press VregChange into third output voltage Vcp, wherein VregV must be comparedldoIt is higher by scheduled first adjusting pressure difference and V must be comparedcpIt is higher by predetermined
Second adjust pressure difference；And as shown in Fig. 1-d, DC-DC converter 10 is used for input voltage VinChange into the first output voltage
Vreg, each LDO linear voltage regulator 11 is for by the first output voltage VregChange into the second output voltage Vldoi, i is 1 between n
Positive integer, and each charge pump 12 is for by the first output voltage VregChange into third output voltage Vcpi, i is 1 between n
Positive integer, wherein VregIt must be than each VldoiIt is higher by scheduled first and adjusts pressure difference and must be than each VcpiIt is higher by scheduled second and adjusts pressure
Difference, that is to say, that VregIt sufficiently high must can be worked normally with ensuring each LDO linear voltage regulator 11 and each charge pump 12.
In addition, adjusting pressure difference can generally determine according to maximum load condition, and adjusts pressure difference and exist in voltage-regulating system
After determination, it would not change again during entire work.In addition, the combined efficiency of voltage-regulating system is equal to DC-DC converter
Efficiency multiplied by LDO linear voltage regulator or the efficiency of charge pump, and the ideal maximal efficiency of LDO linear voltage regulator and charge pump
η be with adjust pressure difference it is directly related, ideal maximal efficiency η can be expressed as follows formula:
Wherein, VldoFor the output voltage of LDO linear voltage regulator, VdropoutFor the adjusting pressure difference of the LDO linear voltage regulator.
It can be seen from the above, adjusting pressure difference VdropoutBigger/smaller, ideal maximal efficiency η is lower/higher.
That is, the prior art is to require setting to adjust pressure difference V according to the maximum load in practical applicationdropout, one
Denier adjusts pressure difference VdropoutAfter determination, pressure difference V is adjusteddropoutIt is remained unchanged during entire work.Relationship shown in Figure 2
Curve graph, existing voltage-regulating system is in various load current ILOADUnder all with fixed adjusting pressure difference VdpBy VregChange into Vldoi
And Vcpi.However, since existing voltage-regulating system is only needing lesser adjusting pressure difference V at light loaddpCan normal operating, therefore,
Existing voltage-regulating system uses secured adjusted pressure difference VdpMethod it is lower in voltage conversion efficiency at light load.
In order to solve the above technical problems, this field needs a kind of new voltage-regulating system.
Summary of the invention
For the problems of the prior art, the present invention provides a kind of voltage-regulating system, realizes that improving entire voltage is adjusted
System is in whole combined efficiency at light load.
To achieve the above object, the present invention the following technical schemes are provided:
The present invention provides a kind of voltage-regulating systems, comprising: DC-to-dc converter and voltage regulation unit；
The DC-to-dc converter, comprising: Switching Power Supply converting unit and feedback unit；
The Switching Power Supply converting unit is for generating switching signal based on the feedback signal so that the Switching Power Supply is converted
Input voltage is converted into the first output voltage by unit,
The feedback unit is used to carry out partial pressure operation to the first output voltage according to adjustable partial pressure ratio to generate feedback
Signal, and the feedback unit has control terminal and determines the adjustable partial pressure ratio according to ratio control signal；
The voltage regulation unit is used to the first output voltage being converted to the second output voltage, second output voltage
Lower than first output voltage；
Wherein, the voltage regulation unit, comprising:
Load current state detection unit, for generating the ratio control signal according to load current with can described in determination
Adjust dividing ratios, wherein the relationship reversely changed is presented in the adjustable partial pressure ratio and the load current.
Wherein, the voltage regulation unit is LDO voltage regulation unit or charge pump.
Wherein, the feedback unit is resistance-type serial circuit.
Wherein, the load current state detection unit, comprising: current lens unit；
The current lens unit, which is used to export electric current according to the voltage regulation unit, generates at least one replica current, and
The load current state detection unit generates the ratio control signal according at least one described replica current.
Wherein, the current lens unit is PMOS current lens unit, comprising: output PMOS transistor and at least one PMOS
Sensing circuit；
The output PMOS transistor is for generating the output electric current；At least one described PMOS sensing circuit is to use
In at least one replica current of generation.
Wherein, the PMOS current lens unit, comprising: operational amplifier；
The operational amplifier and the output PMOS transistor and the PMOS sensing circuit form negative-feedback circuit
To promote the accuracy of replica current.
Wherein, the ratio control signal is digital signal, digital code or analog signal.
As shown from the above technical solution, a kind of voltage-regulating system of the present invention, can be in due course according to the size of load
Ground adjustment adjusts the size of pressure difference (dropout), optimizes in voltage mediation system LDO and/or charge pump in efficiency at light load,
To improve entire voltage mediation system in whole combined efficiency at light load；Can also in height-adjusting system at light load direct current-
The voltage feedback factor of direct current transducer is to downgrade the output voltage of DC-to-dc converter, to reduce adjusting pressure difference
(dropout) LDO in optimization system and/or charge pump improve whole system in entirety at light load in efficiency at light load
Combined efficiency.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is the present invention
Some embodiments for those of ordinary skill in the art without creative efforts, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 is the structural schematic diagram of power-supply management system in the prior art；
Wherein, Fig. 1-a is the structural representation for the power-supply management system that DC-DC converter cascades LDO linear voltage regulator composition
Figure；
Fig. 1-b is the structural schematic diagram for the power-supply management system that DC-DC converter cascades charge pump composition；
Fig. 1-c is that the structure for the power-supply management system that DC-DC converter cascades LDO linear voltage regulator and charge pump composition is shown
It is intended to；
Fig. 1-d is the power management that a DC-DC converter cascades multiple LDO linear voltage regulators and multiple charge pumps composition
The structural schematic diagram of system；
Fig. 2 is that voltage-regulating system is all defeated by first with fixed adjusting pressure difference under various load currents in the prior art
Voltage changes into the graph of relation of the second output voltage out；
Fig. 3 is the structural schematic diagram of voltage-regulating system provided in an embodiment of the present invention；
Fig. 4 is the structural schematic diagram of Switching Power Supply converting unit in voltage-regulating system provided in an embodiment of the present invention；
Fig. 5 is the structural schematic diagram of feedback unit in voltage-regulating system provided in an embodiment of the present invention；
Wherein, Fig. 5-a is a kind of structural schematic diagram of feedback unit；Fig. 5-b is the structural representation of another feedback unit
Figure；
Fig. 6 is the structural schematic diagram of voltage regulation unit in voltage-regulating system provided in an embodiment of the present invention；
Wherein, Fig. 6-a is the circuit diagram of voltage regulator circuit, and Fig. 6-b is the circuit for loading current status detection unit 112
Figure.
Fig. 7 provides for the embodiment of the present invention to be formed adjusting pressure difference produced by pressure adjusting unit by Fig. 6-a and Fig. 6-b and is born
Current-carrying relational graph；
Fig. 8 is another structural schematic diagram of voltage regulation unit in voltage-regulating system provided in an embodiment of the present invention；
Wherein, Fig. 8-a is another circuit diagram of voltage regulator circuit, and Fig. 8-b is load current status detection unit 112
Another circuit diagram.
Fig. 9 provides for the embodiment of the present invention to be formed adjusting pressure difference produced by pressure adjusting unit by Fig. 8-a and Fig. 8-b and is born
Current-carrying relational graph.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, the technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
A kind of voltage-regulating system provided in an embodiment of the present invention, referring to Fig. 3, comprising: 100 He of DC-to-dc converter
Voltage regulation unit 110；Wherein, DC-to-dc converter 100 includes: Switching Power Supply converting unit 101 and feedback unit 102,
Voltage regulation unit 110 is LDO voltage regulation unit or charge pump, and voltage regulation unit 110 includes: voltage regulator circuit
111 and load current state detection unit 112.
Switching Power Supply converting unit 101 is to generate switching signal for FB based on the feedback signal with by input voltage VINConversion
At the first output voltage VREG, feedback unit 102 be for according to adjustable partial pressure ratio to first output voltage VREGDivided
Press operation is to generate feedback signal FB, and there is feedback unit 102 control terminal to be used for according to ratio control signal SLDReally
The fixed adjustable partial pressure ratio.
Further, the embodiment of the invention provides the structures of Switching Power Supply converting unit 101 in above embodiment to show
It is intended to, referring to fig. 4, Switching Power Supply converting unit 101, comprising:
Switching signal generates unit 101a and electric energy transmission unit 101b, wherein switching signal generates unit 101a and is used for
FB generates switching signal SW to drive electric energy transmission unit 101b, thus by electric energy by electric energy transmission unit based on the feedback signal
The input terminal of 101b reaches the output end of electric energy transmission unit 101b.
Further, referring to Fig. 5, the embodiment of the invention provides the structural representations of feedback unit in above embodiment
Figure.
In one embodiment, referring to Fig. 5-a, feedback unit 102 includes: the first resistor 102a being sequentially connected in series, can
Power transformation hinders 102b and second resistance 102c, wherein variable resistance 102b is according to ratio control signal SLDControl determine resistance
Value: when the load of voltage regulation unit 110 lightens, ratio control signal SLDIt can make variable resistance 102b that low resistance be presented
Value；When the load of voltage regulation unit 110 becomes weight, ratio control signal SLDIt can make variable resistance 102b that high resistance be presented
Value.
In another embodiment, referring to Fig. 5-b, feedback unit 102 include: the 3rd resistor 102d being sequentially connected in series,
4th resistance 102e and the 5th resistance 102f, ratio control signal SLDElectric current I can be extracted out from feedback unit 102CNTL, wherein when
When the load of voltage regulation unit 110 lightens, ratio control signal SLDIt can make electric current ICNTLLow current value is presented；When voltage is adjusted
When the load of unit 110 becomes weight, ratio control signal SLDIt can make electric current ICNTLHigh current value is presented.
Voltage regulator circuit 111 is for by the first output voltage VREGChange into the second output voltage VOUT, and according to negative
Carry electric current ILOADGenerate at least one sensing electric current ISEN, wherein the second output voltage VOUTLower than the first output voltage VREG, and
First output voltageVREGWith the second output voltage VOUTPressure difference must be greater than scheduled adjusting pressure difference.
Load current state detection unit 112 is for sensing electric current I according at least oneSENGenerate ratio control signal
SLDTo determine the adjustable partial pressure ratio, wherein the adjustable partial pressure ratio and load current ILOADIt is the relationship reversely changed.
Further, referring to Fig. 6, the embodiment of the invention provides the knots of voltage regulation unit 110 in above embodiment
Structure schematic diagram, wherein Fig. 6-a is the circuit diagram of voltage regulator circuit, and Fig. 6-b is the circuit for loading current status detection unit 112
Figure.
As shown in Fig. 6-a, voltage regulator circuit 111 includes: the first operational amplifier 1111, NMOS transistor 1112,
One PMOS transistor 1113, current lens unit 1114, first resistor 1115, second resistance 1116 and filter capacitor 1117.
First operational amplifier 1111 is for according to reference voltage VREFAnd feedback voltage VXDifference generate driving voltage
VGTo drive NMOS transistor 1112, and when stable state, due to the effect of negative-feedback, the first operational amplifier 1111 can generate void
Short circuit phenomenon and make feedback voltage VXApproach reference voltage VREF.In addition, due to the high magnification numbe voltage of the first operational amplifier 1111
Enlarging function, in feedback voltage VXWith reference voltage VREFGap be less than minimum voltage difference in the case where, caused by driving
Voltage VGCan also there be variation space on a large scale, with corresponding load current I under from underloading to heavily loaded various loading conditionsLOAD。
1112 system of NMOS transistor and the first PMOS transistor 1113 repeatedly connect, and the grid of the first PMOS transistor 1113 and
Drain electrode coupling；When stable state, the current potential of driving voltage VG can make the channel current I1 of NMOS transistor 1112 be fixed on current value
And the grid of the first PMOS transistor 1113 is made to generate voltage VY。
Current lens unit 1114 includes: the second PMOS transistor 1114a, multiple current sampling units (respectively by the 3rd PMOS
Transistor 1114b and the 4th PMOS transistor 1114c repeatedly connects) and second operational amplifier 1114d, wherein the 2nd PMOS
The source electrode of transistor 1114a and the first output voltage VREGCoupling, grid and voltage VYCoupling, drain electrode are for providing output electricity
Flow IOUT；The source electrode and the first output voltage V of the third PMOS transistor 1114b of i-th of current sampling unitREGCoupling, grid
With voltage VYCoupling, drain electrode are for providing sensing electric current ISENi, i is 1 to the positive integer between n, and n is positive integer, and each
In current sampling unit, the drain electrode of the source electrode and third PMOS transistor 1114b of the 4th PMOS transistor 1114c is coupled, and the 4th
The grid of PMOS transistor 1114c and the output end of second operational amplifier 1114d couple, the 4th PMOS transistor 1114c's
Drain electrode is for exporting sensing electric current ISENi, i is 1 to the positive integer between n, and n is positive integer.
First resistor 1115 and second resistance 1116 are to be used to form bleeder circuit will be built on filter capacitor 1117
Vertical output voltage VOUTIt is divided to generate feedback voltage VX。
As shown in Fig. 6-b, load current state detection unit 112 includes: multiple electric current comparing units (respectively comprising electric current ratio
Compared with device 1121a and reference current source 1121b) and coding circuit 1122, wherein each electric current comparing unit is for being felt according to output
Survey electric current ISENiWith the constant current I of reference current source 1121bREFiDifference generate digital output voltage OUTi, i is between 1 to n
Integer, and IREF1To IREFnIt is incrementally to configure；Coding circuit 1122 is then for according to OUT1To OUTnNumber
Value generates coding result, and generates ratio control signal S according to the coding resultLD, to determine the resistance of variable resistance 102b
Value, wherein when the load of voltage regulation unit 110 is by gently becoming weight, ratio control signal S caused by coding circuit 1122LD
Can make the resistance value of variable resistance 102b stepwise becomes high from low, to make the first of DC-to-dc converter 100 to export
Voltage VREGStepwise become high from low.Referring to Fig. 7, adjusting caused by voltage regulation unit is formed by Fig. 6-a and Fig. 6-b
Pressure difference and load current ILOADRelational graph.As shown in fig. 7, working as load current ILOADBy gently become weight and when, the first output voltage
VREGIt is stepwise in load current turning point (I1,I2…In) from low become high, while making to adjust pressure difference by Vdp0Stepwise
It is incremented to Vdpn。
Further, referring to Fig. 8, the embodiment of the invention provides in above embodiment voltage regulation unit 110 it is another
One structural schematic diagram, wherein Fig. 8-a is another circuit diagram of voltage regulator circuit 111, and Fig. 8-b is that load current status detection is single
Another circuit diagram of member 112.
As shown in fig 8-a, voltage regulator circuit 111 includes: the first operational amplifier 1111, NMOS transistor 1112,
One PMOS transistor 1113, current lens unit 1114, first resistor 1115, second resistance 1116 and filter capacitor 1117.
First operational amplifier 1111 is for according to reference voltage VREFAnd feedback voltage VXDifference generate driving voltage
VGTo drive NMOS transistor 1112, and when stable state, due to the effect of negative-feedback, the first operational amplifier 1111 can generate void
Short circuit phenomenon and make feedback voltage VXApproach reference voltage VREF.In addition, due to the high magnification numbe voltage of the first operational amplifier 1111
Enlarging function, in feedback voltage VXWith reference voltage VREFGap be less than minimum voltage difference in the case where, caused by driving
Voltage VGCan also there be variation space on a large scale, with corresponding load current I under from underloading to heavily loaded various loading conditionsLOAD。
NMOS transistor 1112 and the first PMOS transistor 1113 repeatedly connect, and the grid of the first PMOS transistor 1113 and leakage
Pole coupling；When stable state, driving voltage VGCurrent potential the channel current I1 of NMOS transistor 1112 can be made to be fixed on current value simultaneously
The grid gate of the first PMOS transistor 1113 is set to generate voltage VY。
Current lens unit 1114 includes: the second PMOS transistor 1114a, current sampling unit (tri- PMOS crystal of You Yi
Pipe 1114b and the 4th PMOS transistor 1114c repeatedly connects) and second operational amplifier 1114d, wherein the 2nd PMOS crystal
The source electrode of pipe 1114a and the first output voltage VREGCoupling, grid and voltage VYCoupling, drain electrode is for providing load current
IOUT；The source electrode and the first output voltage V of the third PMOS transistor 1114b of current sampling unitREGCoupling, grid and voltage VY
Coupling, drain electrode are for providing sensing electric current ISEN, and the source electrode of the 4th PMOS transistor 1114c and third PMOS transistor
The drain electrode of 1114b couples, and the grid of the 4th PMOS transistor 1114c and the output end of second operational amplifier 1114d couple, and
The drain electrode of 4th PMOS transistor 1114c is for exporting sensing electric current ISEN。
First resistor 1115 and second resistance 1116 are to be used to form bleeder circuit will be built on filter capacitor 1117
Vertical output voltage VOUTIt is divided to generate feedback voltage VX。
As shown in Fig. 8-b, load current state detection unit 112 includes: third operational amplifier 1123a, the first NMOS
Transistor 1123b, drain resistance 1123c, source resistance 1123d, the second NMOS transistor 1123e, current-limiting resistance 1123f,
Three NMOS transistor 1123g and the 4th NMOS transistor 1123h, wherein third operational amplifier 1123a, the first NMOS crystal
Pipe 1123b, drain resistance 1123c and source resistance 1123d be used to form negative-feedback circuit so that source resistance 1123d across
Pressure is equal to reference voltage VREFTo generate constant current, so that the output end of third operational amplifier 1123a be made to generate fixed current limliting
Voltage VLIM；And third NMOS transistor 1123g and the 4th NMOS transistor 1123h be for form current mirror so that
Three NMOS transistor 1123g can be according to the sensing electric current I in the channel for flowing through the 4th NMOS transistor 1123hSENGenerate electric current
ICNTL, and the second NMOS transistor 1123e and current-limiting resistance 1123f are then for electric current ICNTLMaximum current limitation is provided
Mechanism, principle are:
(1) fixed limit voltage VLIMGate-source pressure difference+current-limiting resistance of=the second NMOS transistor 1123e
The cross-pressure of 1123f+third NMOS transistor 1123g Drain-Source pressure difference；
(2) therefore, as electric current ICNTLWhen increase, the cross-pressure of current-limiting resistance 1123f can and then increase, and work as current-limiting resistance
The cross-pressure of 1123f increases to limiting value or more and keeps the gate-to-source pressure difference of the second NMOS transistor 1123e or the 3rd NMOS brilliant
When the Drain-Source pressure difference of body pipe 1123g is unable to reach required numerical value, the second NMOS transistor 1123e or the 3rd NMOS are brilliant
Body pipe 1123g just can not work at saturation region (saturation region).
According to this, when the load of voltage regulation unit 110 lightens, ratio control signal SLDIt can make electric current ICNTLIt presents low
Current value is so that feedback unit 102 provides high feedback proportional to generate the first low output voltage VREG；Work as voltage regulation unit
When 110 load becomes weight, ratio control signal SLDIt can make electric current ICNTLHigh current value is presented so that feedback unit 102 provide it is low
Feedback proportional to generate the first high output voltage VREG。
Referring to Fig. 9, adjusting pressure difference and load current caused by the voltage regulation unit be made of Fig. 8-a and Fig. 8-b
Relational graph.As shown in figure 9, working as load current ILOADBy gently become weight and when, the first output voltage VREGSystem is linearly incremented by, simultaneously
Make to adjust pressure difference and also follow linearly to be incremented by.
In conclusion a kind of voltage-regulating system provided in an embodiment of the present invention, can in time adjust according to the size of load
The whole size for adjusting pressure difference (dropout) optimizes in voltage mediation system LDO and/or charge pump in efficiency at light load, thus
Entire voltage mediation system is improved in whole combined efficiency at light load；Can also in height-adjusting system at light load DC-DC
The voltage feedback factor of converter adjusts pressure difference (dropout) to downgrade the output voltage of DC-to-dc converter, to reduce
LDO and/or charge pump in optimization system improve whole system in whole combined efficiency at light load in efficiency at light load.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.Term " on ", "lower" etc. refer to
The orientation or positional relationship shown is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of the description present invention and simplifies
Description, rather than the device or element of indication or suggestion meaning must have a particular orientation, constructed and grasped with specific orientation
Make, therefore is not considered as limiting the invention.Unless otherwise clearly defined and limited, term " installation ", " connected ",
" connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can be
Mechanical connection, is also possible to be electrically connected；It can be directly connected, two can also be can be indirectly connected through an intermediary
Connection inside element.For the ordinary skill in the art, above-mentioned term can be understood at this as the case may be
Concrete meaning in invention.
In specification of the invention, numerous specific details are set forth.Although it is understood that the embodiment of the present invention can
To practice without these specific details.In some instances, well known method, structure and skill is not been shown in detail
Art, so as not to obscure the understanding of this specification.Similarly, it should be understood that disclose in order to simplify the present invention and helps to understand respectively
One or more of a inventive aspect, in the above description of the exemplary embodiment of the present invention, each spy of the invention
Sign is grouped together into a single embodiment, figure, or description thereof sometimes.However, should not be by the method solution of the disclosure
Release is in reflect an intention that i.e. the claimed invention requires more than feature expressly recited in each claim
More features.More precisely, as the following claims reflect, inventive aspect is less than single reality disclosed above
Apply all features of example.Therefore, it then follows thus claims of specific embodiment are expressly incorporated in the specific embodiment,
It is wherein each that the claims themselves are regarded as separate embodiments of the invention.It should be noted that in the absence of conflict, this
The feature in embodiment and embodiment in application can be combined with each other.The invention is not limited to any single aspect,
It is not limited to any single embodiment, is also not limited to any combination and/or displacement of these aspects and/or embodiment.And
And can be used alone each aspect and/or embodiment of the invention or with other one or more aspects and/or its implementation
Example is used in combination.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme should all cover within the scope of the claims and the description of the invention.
Claims (7)
1. a kind of voltage-regulating system characterized by comprising DC-to-dc converter and voltage regulation unit；
The DC-to-dc converter, comprising: Switching Power Supply converting unit and feedback unit；
The Switching Power Supply converting unit for generating switching signal so that the Switching Power Supply converting unit based on the feedback signal
Input voltage is converted into the first output voltage,
The feedback unit is used to carry out partial pressure to the first output voltage according to adjustable partial pressure ratio to operate to generate feedback signal,
And the feedback unit has control terminal and determines the adjustable partial pressure ratio according to ratio control signal；
The voltage regulation unit is used to the first output voltage being converted to the second output voltage, and second output voltage is lower than
First output voltage；
Wherein, the voltage regulation unit, comprising:
Load current state detection unit, for generating the ratio control signal according to load current with described adjustable point of determination
Pressure ratio example, wherein the relationship reversely changed is presented in the adjustable partial pressure ratio and the load current.
2. voltage-regulating system according to claim 1, which is characterized in that the voltage regulation unit is LDO voltage tune
Save unit or charge pump.
3. voltage-regulating system according to claim 1, which is characterized in that the feedback unit is that resistance-type is serially electric
Road.
4. voltage-regulating system according to claim 1, which is characterized in that the load current state detection unit, packet
It includes: current lens unit；
The current lens unit, which is used to export electric current according to the voltage regulation unit, generates at least one replica current, and described
Load current state detection unit generates the ratio control signal according at least one described replica current.
5. voltage-regulating system according to claim 4, which is characterized in that the current lens unit is PMOS current mirror list
Member, comprising: output PMOS transistor and at least one PMOS sensing circuit；
The output PMOS transistor is for generating the output electric current；At least one described PMOS sensing circuit is for producing
At least one raw replica current.
6. voltage-regulating system according to claim 5, which is characterized in that the PMOS current lens unit, comprising: operation
Amplifier；
The operational amplifier and the output PMOS transistor and the PMOS sensing circuit form negative-feedback circuit to mention
Rise the accuracy of replica current.
7. voltage-regulating system according to claim 1, which is characterized in that the ratio control signal be digital signal,
Digital code or analog signal.
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| CN201910224191.2A CN109802563A (en) | 2019-03-22 | 2019-03-22 | Voltage-regulating system |
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