CN104079177B - A kind of circuit of voltage adjuster - Google Patents
A kind of circuit of voltage adjuster Download PDFInfo
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- CN104079177B CN104079177B CN201410290251.8A CN201410290251A CN104079177B CN 104079177 B CN104079177 B CN 104079177B CN 201410290251 A CN201410290251 A CN 201410290251A CN 104079177 B CN104079177 B CN 104079177B
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- 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
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
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- Power Engineering (AREA)
- Continuous-Control Power Sources That Use Transistors (AREA)
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Abstract
The embodiment of the invention discloses a kind of circuit of voltage adjuster, including voltage input end, voltage transformation unit, feedback control unit, pressure release unit and voltage output end, wherein, the feedback control unit is used to accordingly reduce or raise when the output voltage of the positive pole of the voltage output end is higher or lower than predetermined threshold value the pressure drop of the voltage transformation unit, the pressure release unit includes switching tube, the feedback control unit is additionally operable to turn on the switching tube in the output voltage saltus step of the positive pole of the voltage output end, clutter of the switching tube for the positive pole of the voltage output end of being released in conducting.Using the present invention, it is possible to reduce the noise of the output voltage of voltage adjuster, the stability of voltage adjuster is improved.
Description
Technical field
The present invention relates to electronic technology field, more particularly to a kind of circuit of voltage adjuster.
Background technology
Voltage adjuster is a kind of linear voltage regulator, is adjusted by the transistor or MOSFET pipes that are run in linear work area
Output voltage, input voltage and output voltage difference are maintained within rated value.Voltage adjuster has the low, Static Electro of loss
The features such as flowing small and simple structure, therefore it is widely used in all kinds of electronic equipments.
In application process, unavoidably, the output voltage of voltage adjuster may change because of temperature, voltage drift or
The reasons such as process node integrated level increase produce noise, and such as spine pulse is born directly to load-strap, as influence is loaded
Energy loss of response speed and high load etc..
The content of the invention
The embodiment of the invention provides a kind of circuit of voltage adjuster, it is possible to reduce the output voltage of voltage adjuster
Noise, improves the stability of voltage adjuster.
Embodiment of the present invention first aspect provides a kind of circuit of voltage adjuster, including voltage input end, transformation list
Unit, feedback control unit, pressure release unit and voltage output end, wherein：
The first end of the voltage transformation unit is connected with the positive pole of the voltage input end, the second end of the voltage transformation unit with
The positive pole of the voltage output end is connected, and the input of the feedback control unit is connected with the positive pole of the voltage output end,
The output end of the feedback control unit is connected with the controlled end of the voltage transformation unit, the first end of the pressure release unit with it is described
The positive pole of voltage output end is connected, and the second end of the pressure release unit is connected with the negative pole of the voltage output end, the pressure release
3rd end of unit is connected with the output end of the feedback control unit；
It is higher or lower than default threshold that the feedback control unit is used in the output voltage of the positive pole of the voltage output end
The pressure drop of the voltage transformation unit is accordingly reduced or raised during value to stablize the output voltage of the positive pole of the voltage output end, institute
Stating pressure release unit includes switching tube, and the feedback control unit is additionally operable to be jumped in the output voltage of the positive pole of the voltage output end
The switching tube, clutter of the switching tube for the positive pole of the voltage output end of being released in conducting are turned on during change.
In the first possible implementation of first aspect, the pressure release unit also includes the first filter capacitor and equivalent
Resistance, the switching tube is NMOS (Negative channel Metal Oxide Semiconductor, N-channel MOS) pipes,
Wherein：
The drain electrode of the switching tube is connected with the positive pole of the voltage output end, the source electrode of the switching tube respectively with it is described
The first end of the first filter capacitor is connected with the first end of the equivalent resistance, the grid of the switching tube and the feedback control
The output end of unit is connected, the negative pole of the voltage output end respectively with the second end of first filter capacitor and described equivalent
Second end of resistance is connected.
With reference to the first possible implementation of first aspect, in second possible implementation, when the voltage is defeated
When the output voltage for going out the positive pole at end occurs saltus step, the output voltage increase of the output end of the feedback control unit is described to open
The voltage for closing the grid of pipe will be greater than the cut-in voltage of the switching tube, and then the switching tube is turned on, first filtered electrical
Hold the clutter that the filter network constituted with the equivalent resistance will filter the positive pole of the voltage output end.
With reference to the possibility implementation of first aspect, in the third possible implementation, the circuit also includes filtering
Unit, the first end of the filter unit is connected with the positive pole of the voltage output end, the second end of the filter unit and institute
The negative pole for stating voltage output end is connected；
The filter unit is used for the clutter of the positive pole for filtering the voltage output end.
With reference to the third possible implementation of first aspect and first aspect, in the 4th kind of possible implementation,
The filter unit includes the second filter capacitor, the first end of second filter capacitor and the positive pole phase of the voltage output end
Even, the second end of second filter capacitor is connected with the negative pole of the voltage output end.
With reference to the possibility implementation of first aspect, in the 5th kind of possible implementation, the feedback control unit bag
The first divider resistance, the second divider resistance and error amplifier are included, wherein：
The first end of first divider resistance is connected with the positive pole of the voltage output end, first divider resistance
Second end is connected with the first end of second divider resistance, the second end and the voltage output end of second divider resistance
Negative pole be connected, the positive input terminal of the error amplifier is connected with the second end of first divider resistance, and the error is put
The negative input end of big device accesses the first reference voltage, and the output end of the error amplifier is controlled with the voltage transformation unit respectively
End is connected with the 3rd end of the pressure release unit.
With reference to first aspect and the 5th kind of possible implementation of first aspect, in the 6th kind of possible implementation,
The voltage transformation unit includes P-Power-MOSFET (Positive channel-Power-Metal Oxide
Semiconductor Field Effect Transistor, P-channel power MOS field effect crystal) pipe, wherein, the P-
The source electrode of Power-MOSFET pipes is connected with the positive pole of the voltage input end, the drain electrode of the P-Power-MOSFET pipes and institute
The positive pole for stating voltage output end is connected, the grid of the P-Power-MOSFET pipes and the output end phase of the error amplifier
Even.
With reference to first aspect and the 6th kind of possible implementation of first aspect, in the 7th kind of possible implementation,
When the output voltage of the positive pole of the voltage output end is higher than predetermined threshold value, the voltage of the positive input terminal of the error amplifier
Difference with first reference voltage increases, and then the output current of the output end of the error amplifier reduces, the P-
The source electrode of Power-MOSFET pipes and the pressure drop of drain electrode increase, and then the output voltage of the positive pole of the voltage output end reduces；
When the output voltage of the positive pole of the voltage output end is less than predetermined threshold value, the positive input of the error amplifier
The difference of the voltage at end and first reference voltage reduces, and then the output current of the output end of the error amplifier increases
Greatly, the output of the pressure drop reduction of the source electrode of the P-Power-MOSFET pipes and drain electrode, and then the positive pole of the voltage output end
Voltage increases.
With reference to the possibility implementation of first aspect, in the 8th kind of possible implementation, the feedback control unit
Output end includes the first output end and the second output end, the first output end and the voltage transformation unit of the feedback control unit
Controlled end is connected, and the second output end of the feedback control unit is connected with the 3rd end of the pressure release unit,
The feedback control unit includes the first divider resistance, the second divider resistance, digital comparator and digital control
Device, wherein：
The first end of first divider resistance is connected with the positive pole of the voltage output end, first divider resistance
Second end is connected with the first end of second divider resistance, the second end and the voltage output end of second divider resistance
Negative pole be connected, the positive input terminal of the digital comparator is connected with the second end of first divider resistance, it is described numeral compare
Negative input end compared with device accesses the second reference voltage, and the output end of the digital comparator is defeated with the digitial controller respectively
Enter end to be connected with the 3rd end of the pressure release unit, the controlled end phase of the output end of the digitial controller and the voltage transformation unit
Even.
With reference to first aspect and the 8th kind of possible implementation of first aspect, in the 9th kind of possible implementation,
The voltage transformation unit includes at least three PMOS (Positive channel Metal Oxide Semiconductor, P-channel
MOS) manage, the port number of the output end of the digitial controller no less than the PMOS number, wherein, described in each
The positive pole that the source electrode of PMOS enters out end with the voltage is connected, the drain electrode of each PMOS with the voltage output
The positive pole at end is connected, and the grid of each PMOS is connected with the corresponding ports of the output end of the digitial controller.
With reference to first aspect and the 9th kind of possible implementation of first aspect, in the tenth kind of possible implementation,
When the output voltage of the positive pole of the voltage output end is higher than predetermined threshold value, the voltage of the positive input terminal of the digital comparator
Difference with second reference voltage increases, and then the output voltage of the output end of the error amplifier increases, the number
Word controller will reduce the number of the PMOS of conducting, and total resistance of the PMOS of the conducting increases, the conducting
The source electrode of PMOS and the overall presure drop of drain electrode increase, and then the output voltage of the positive pole of the voltage output end reduces；
When the output voltage of the positive pole of the voltage output end is less than predetermined threshold value, the positive input of the digital comparator
The difference of the voltage at end and second reference voltage reduces, and then the output voltage of the output end of the error amplifier subtracts
Small, the digitial controller will increase the number of the PMOS of conducting, and total resistance of the PMOS of the conducting is reduced, institute
The overall presure drop of the source electrode and drain electrode of stating the PMOS of conducting reduces, and then the output voltage of the positive pole of the voltage output end increases
Greatly.
Therefore, the feedback control unit in the embodiment of the present invention changes voltage transformation unit according to the voltage of voltage output end
Pressure drop, so as to the input voltage of voltage adjuster and output voltage difference are maintained within rated value, filter unit can be filtered
Except the clutter in voltage output end output voltage, further, when the voltage of voltage output end occurs saltus step, response filtering is single
Switching tube conducting in unit, the switching tube of conducting can discharge voltage output end clutter.
Brief description of the drawings
In order to illustrate more clearly the embodiments of the present invention, below will be to be used needed for embodiment or description of the prior art
Accompanying drawing be briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for this
For the those of ordinary skill of field, on the premise of not paying creative work, can also obtain other according to these accompanying drawings
Accompanying drawing.
Fig. 1 is a kind of structural representation of the circuit of voltage adjuster provided in an embodiment of the present invention；
Fig. 2 is a kind of schematic diagram of the circuit of voltage adjuster provided in an embodiment of the present invention；
Fig. 3 is the schematic diagram of the circuit of another voltage adjuster provided in an embodiment of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
The circuit of the voltage adjuster in the embodiment of the present invention can be applied to smart mobile phone, PC, panel computer, number
The electronic equipment such as word music player and electronic reader, is capable of achieving " DC (Direct Current, direct current)-DC " voltage stabilizing
Effect.
Fig. 1 is a kind of structural representation of the circuit of voltage adjuster provided in an embodiment of the present invention.This reality as shown in the figure
The circuit for applying the voltage adjuster in example can include voltage input end Vi, voltage transformation unit 110, feedback control unit 120, pressure release
Unit 130 and voltage output end Vo, wherein：
The first end of voltage transformation unit 110 and voltage input end ViPositive pole be connected, the second end of voltage transformation unit 110 and voltage
Output end VoPositive pole be connected, the input of feedback control unit 120 and voltage output end VoPositive pole be connected, feedback control list
The output end of unit 120 is connected with the controlled end of voltage transformation unit 110, first end and the voltage output end V of pressure release unit 130oJust
Extremely it is connected, the second end and the voltage output end V of pressure release unit 130oNegative pole be connected, the 3rd end of pressure release unit 130 and feedback
The output end of control unit 120 is connected.
Feedback control unit 120 is used in voltage output end VoPositive pole output voltage be higher or lower than predetermined threshold value when
The pressure drop of voltage transformation unit 110 is accordingly reduced or raised with burning voltage output end VoPositive pole output voltage, pressure release unit
130 include switching tube, and feedback control unit 120 is additionally operable in voltage output end VoPositive pole output voltage saltus step when conducting open
Guan Guan, clutter of the switching tube for the positive pole of the voltage output end of being released in conducting.
Optionally, the circuit of voltage adjuster can also include filter unit 140, first end and the electricity of filter unit 140
Pressure output end VoPositive pole be connected, the second end of filter unit 140 and voltage output end VoNegative pole be connected.Filter unit 140 is used
In filtering voltage output end VoPositive pole clutter.
Fig. 2 is the schematic diagram of the circuit of the optional a kind of voltage adjuster in the embodiment of the present invention.
Used as a kind of optional embodiment, voltage transformation unit 110 includes P-Power-MOSFET (Positive channel-
Power-Metal Oxide Semiconductor Field Effect Transistor, P-channel power MOS field effect is brilliant
Body) pipe, P-Power-MOSFET pipes are as shown in MOSFET in figure；Feedback control unit 120 includes the first divider resistance R1, second
Divider resistance R2 and error amplifier A1；Switching tube is NMOS (Negative channel Metal Oxide
Semiconductor, N-channel MOS) pipe, as shown in NMOS in figure, pressure release unit 130 also includes the first filter capacitor C1 and waits
Effect resistance R3；Filter unit 140 includes the second filter capacitor C2.
Wherein, the drain electrode of switching tube NMOS and voltage output end VoPositive pole be connected, the source electrode of switching tube NMOS respectively with
The first end of the first filter capacitor C1 is connected with the first end of equivalent resistance R3, voltage output end VoNegative pole respectively with first filter
Second end of ripple electric capacity C1 is connected with second end of equivalent resistance R3, the grid of switching tube NMOS and the output of error amplifier A1
End is connected, first end and the voltage output end V of the first divider resistance R1oPositive pole be connected, second end of the first divider resistance R1
First end with the second divider resistance R2 is connected, the second end and the voltage output end V of the second divider resistance R2oNegative pole be connected,
The positive input terminal of error amplifier A1 is connected with second end of the first divider resistance R1, and the negative input end of error amplifier A1 is accessed
First reference voltage Vref 1, the grid of the output end of error amplifier A1 also with power tube MOSFET is connected, power tube MOSFET
Source electrode and voltage input end ViPositive pole be connected, the drain electrode of power tube MOSFET and voltage output end VoPositive pole be connected, second
The first end of filter capacitor C2 and voltage output end VoPositive pole be connected, second end of the second filter capacitor C2 and voltage output end
VoNegative pole be connected.
The operation principle of voltage adjuster is specifically described below in conjunction with Fig. 2：
Voltage input end ViUpper electricity and voltage output end VoAfter external load, the circuit of voltage adjuster is in running order.
If voltage input end ViPositive pole voltage be Vin, voltage output end VoPositive pole voltage be Vout, voltage input end ViWith electricity
Pressure output end VoPressure drop be Vdrop, then Vout=Vin-Vdrop.Wherein, traditional voltage adjuster (chip of such as 78xx series)
Require VdropMore than 2V, otherwise cannot normal work, in some Vdrop(such as V in the case of less than 2Vin=5V, Vout=
3.3V, now Vdrop=1.7V<2V), traditional voltage adjuster can not meet requirement.For above-mentioned situation, the present invention is implemented
Example chooses P-Power-MOSFET pipes as transformation device to realize the low voltage regulator for falling, specifically, P-Power-
Resistance R between the source electrode of MOSFET and drain electrodedsIt is very small, therefore the source electrode of P-Power-MOSFET in linear work area and leakage
The pressure drop of pole is smaller than 2V, is capable of achieving low drop-off voltage.
Further, loop " 1 → 2 → 3 → 4 " constitute feedback loop, as voltage output end VoPositive pole output voltage it is high
When predetermined threshold value, the difference increase of the voltage of the positive input terminal of error amplifier A1 and the first reference voltage Vref 1, by error
" input-output " characteristic of amplifier understands, the output current of the output end of error amplifier A1 increased according to above-mentioned difference and
Reduce.Because now P-Power-MOSFET pipes work is in linear work area, therefore source electrode and the drain electrode of P-Power-MOSFET pipes
Pressure drop with error amplifier A1 output current reduce and increase (concrete principle refers to the characteristic of P-Power-MOSFET pipes
Curve, repeats no more here).Further according to Vout=Vin-VdropUnderstand, if VdropIncrease, then VoutReduce, thus voltage output end
VoPositive pole output voltage will reduce, until returning to predetermined threshold value.For example：Assuming that Vin=5V, VoutPredetermined threshold value be
3.3V, Vref1=1V, and R1=R2, the sampled voltage V of the positive input terminal of error amplifier A1reg=1.65V, i.e. (Vreg-Vref1)
=0.65V, works as VoutFrom 3.3V saltus steps be 4V when, Vreg2V is increased to, now (Vreg-Vref1)=1V>0.65V, and then error puts
The output current of big device A1 accordingly reduces according to the increment value of (Vreg-Vref1), so that the source electrode of P-Power-MOSFET pipes
Pressure drop increase with drain electrode, until increase 0.7V, so that Vout=4V-0.7V=3.3V, recovers predetermined threshold value again.Similarly may be used
Know, on the contrary, working as voltage output end VoPositive pole output voltage be less than predetermined threshold value when, voltage output end VoPositive pole it is defeated
Go out voltage increase, until returning to predetermined threshold value.The embodiment of the present invention realizes the work of the output voltage of burning voltage adjuster
With.
In addition, electric capacity C2 constitutes simple filter unit 140, voltage output end V is filteredoThe non-dc electricity being mingled with, i.e., it is miscellaneous
Ripple.Filter unit 140 is not limited in only including electric capacity C2.
It is pointed out that first, above-mentioned feedback loop (i.e. feedback control unit 120) are although can realize that burning voltage is exported
End VoOutput voltage effect, but whole feedback procedure time delay is more long, and the jitter time delay of clutter is shorter, it is impossible to quick to ring
Should, second, the capacitance of the C1 in above-mentioned electric capacity C2 (i.e. filter unit 140) is bigger, and filter capacity is stronger, but output voltage becomes
The time delay of change will also increase, while the degree-of-difficulty factor for making electric capacity also increases therewith.As can be seen here, only comprising feedback control unit
The voltage adjuster and imperfection of 120 and RC filter units 140.Thus, the circuit of voltage adjuster further comprises pressure release unit
130, specifically, as voltage output end VoOutput voltage occur saltus step (i.e. output voltage values are varied widely in the short time)
When, the difference increase of the voltage of the positive input terminal of error amplifier A1 and the first reference voltage Vref 1, error amplifier A1's is defeated
The output voltage for going out end increases and increases according to above-mentioned difference, and the voltage of the grid of the switching tube will be greater than the switching tube
Cut-in voltage, switching tube NMOS conductings, and then filtered by filter network that the first filter capacitor C1 and equivalent resistance R3 are constituted
Voltage output end VoPositive pole clutter, so as to reduce spine pulse, improve the noiseproof feature of voltage adjuster.
Fig. 3 is the schematic diagram of the circuit of the optional another voltage adjuster in the embodiment of the present invention.In Fig. 3 and Fig. 2
Circuit difference be voltage transformation unit 110 and feedback control unit 120, Fig. 2 is the circuit diagram under analog feedback mode, and Fig. 3 is
Circuit diagram under digital feedback approach.It is pointed out that the operation principle of pressure release unit 130 and filter unit 140 is in this reality
Apply and repeat no more.
Used as a kind of optional embodiment, voltage transformation unit 110 includes at least three PMOS (Positive channel
Metal Oxide Semiconductor, P-channel MOS) pipe, as shown in PMOS in figure；The output end of feedback control unit 120
Including the first output end and the second output end, respectively as shown in end points 5 in figure and end points 6, feedback control unit 120 includes first
Divider resistance R1, the second divider resistance R2, digital comparator A2 and digitial controller A3, the output end of digitial controller A3
Number of the port number no less than PMOS.
Wherein, the first end of the first divider resistance R1 and voltage output end VoPositive pole be connected, the first divider resistance R1's
Second end is connected with the first end of the second divider resistance R2, the second end and the voltage output end V of the second divider resistance R2oNegative pole
It is connected, the positive input terminal of digital comparator A2 is connected with second end of the first divider resistance R1, the negative input of digital comparator A2
Terminate into the second reference voltage Vref 2, the output end of digital comparator A2 respectively with the input and switch of digitial controller A3
The grid of pipe NMOS is connected, and each output end of digitial controller A3 is connected with the grid of corresponding PMOS respectively.
Specifically, the operation principle of voltage transformation unit 110 and feedback control unit 120 is illustrated below in conjunction with Fig. 3：
Voltage input end ViUpper electricity and voltage output end VoAfter external load, the circuit of voltage adjuster is in running order.
Loop " 1 → 2 → 3 → 4 → 5 " constitutes feedback loop, as voltage output end VoPositive pole output voltage be higher than predetermined threshold value when, number
The difference increase of the voltage of the positive input terminal of word comparator A2 and the second reference voltage Vref 2, and then digital comparator A2's is defeated
Go out voltage to be increased according to above-mentioned difference and increased, i.e. the voltage increase of the input of digitial controller A3.Wherein, digitial controller
(DC, Digital Controller) is a kind of common electronic controller, is typically connected with feedback fraction in circuit, including A/
D is changed or D/A conversions, typically by computer software programming or logic circuit, completes specific control algolithm.It is digital control
Device A3 accordingly reduces the number of the PMOS of conducting according to the increment value of the output voltage of digital comparator A2, due to conducting
There is resistance R between the drain electrode of PMOS and source electrodedsIf, the resistance R of parallel connectiondsReduce, then the all-in resistance of the PMOS for turning on will increase
Greatly, its pressure drop also increases, further according to Vout=Vin-VdropUnderstand, VdropIncrease, VoutReduce, thus voltage output end VoPositive pole
Output voltage reduce.For example：Assuming that there is 4 PMOSs in circuit, the output byte of the output end of digitial controller A3 is
" 0011 ", i.e. PMOS M1 and M2 turn on, and M3 and M4 are not turned on, and Vin=5V, VoutPredetermined threshold value be 3.3V, Vref1=1V,
And R1=R2, the sampled voltage V of the positive input terminal of digital comparator A2reg=1.65V, then, work as VoutIt is 4V from 3.3V saltus steps
When, Vreg2V is increased to, now (Vreg-Vref1)=1V>0.65V, the output voltage of digital comparator A2 output ends is according to (Vreg-
Vref1) increment value accordingly increase, output byte after the output voltage of digitial controller A3 analyses digital comparator A2
" 0111 ", i.e. only control PMOS M1 conductings, the resistance of M1 has increased relative to the resistance of M1 and M2 in parallel, so that conducting
PMOS overall presure drop increase 0.7 so that Vout=4V-0.7V=3.3V, recovers predetermined threshold value again.Similarly understand, conversely
Ground, as voltage output end VoPositive pole output voltage be less than predetermined threshold value when, voltage output end VoPositive pole output voltage increase
Greatly.The embodiment of the present invention realizes the effect of the output voltage of burning voltage adjuster.It is pointed out that the number of PMOS
More, the precision of the transformation of voltage transformation unit 110 is higher.
Feedback control unit in the embodiment of the present invention changes the pressure drop of voltage transformation unit according to the voltage of voltage output end, from
And maintain within rated value the input voltage of voltage adjuster and output voltage difference, filter unit can filter voltage output
Clutter in the output voltage of end, further, when there is saltus step in the voltage of voltage output end, the switch in response filter unit
Pipe is turned on, the switching tube of conducting can discharge voltage output end clutter.
The circuit of the voltage adjuster for being provided the embodiment of the present invention above is described in detail, used herein
Specific case is set forth to principle of the invention and implementation method, and the explanation of above example is only intended to help and understands this
The method and its core concept of invention；Simultaneously for those of ordinary skill in the art, according to thought of the invention, specific
Be will change in implementation method and range of application, in sum, this specification content should not be construed as to of the invention
Limitation.
Claims (9)
1. a kind of circuit of voltage adjuster, it is characterised in that the circuit includes voltage input end, voltage transformation unit, feedback control
Unit processed, pressure release unit and voltage output end, wherein：
The voltage transformation unit includes at least three PMOSs, the source electrode of each PMOS with the voltage input end just
Extremely be connected, the positive pole of the drain electrode with the voltage output end of each PMOS is connected, the feedback control unit it is defeated
Enter end to be connected with the positive pole of the voltage output end, the feedback control unit includes digitial controller, the digitial controller
Output end be connected with the controlled end of the voltage transformation unit, the port number of the output end of the digitial controller is no less than described
The number of PMOS, the grid of each PMOS is connected with the corresponding ports of the output end of the digitial controller, described
The first end of pressure release unit is connected with the positive pole of the voltage output end, the second end and the voltage output of the pressure release unit
The negative pole at end is connected, and the 3rd end of the pressure release unit is connected with the output end of the feedback control unit；
The feedback control unit is used for when the output voltage of the positive pole of the voltage output end is higher or lower than predetermined threshold value
The pressure drop of the voltage transformation unit is accordingly reduced or raised to stablize the output voltage of the positive pole of the voltage output end, it is described to let out
Pressure unit includes switching tube, the first filter capacitor and equivalent resistance, and the feedback control unit is additionally operable in the voltage output
During the output voltage saltus step of the positive pole at end, the output voltage increase of the output end of the feedback control unit, the switching tube
The voltage of grid will be greater than the cut-in voltage of the switching tube, and then turn on the switching tube, in switching tube conducting when institute
Stating the filter network that the first filter capacitor and the equivalent resistance constitute is used for the clutter of the positive pole for filtering the voltage output end.
2. the circuit of voltage adjuster as claimed in claim 1, it is characterised in that the switching tube is NMOS (Negative
Channel Metal Oxide Semiconductor, N-channel MOS) pipe, wherein：
The drain electrode of the switching tube is connected with the positive pole of the voltage output end, and the source electrode of the switching tube is respectively with described first
The first end of filter capacitor is connected with the first end of the equivalent resistance, the grid of the switching tube and the feedback control unit
Output end be connected, the negative pole of the voltage output end the second end respectively with first filter capacitor and the equivalent resistance
The second end be connected.
3. the circuit of voltage adjuster as claimed in claim 1, it is characterised in that the circuit also includes filter unit, institute
The first end for stating filter unit is connected with the positive pole of the voltage output end, and the second end of the filter unit is defeated with the voltage
The negative pole for going out end is connected；
The filter unit is used for the clutter of the positive pole for filtering the voltage output end.
4. the circuit of voltage adjuster as claimed in claim 3, it is characterised in that the filter unit includes the second filtered electrical
Hold, the first end of second filter capacitor is connected with the positive pole of the voltage output end, the second of second filter capacitor
End is connected with the negative pole of the voltage output end.
5. the circuit of voltage adjuster as claimed in claim 1, it is characterised in that the feedback control unit includes first point
Piezoresistance, the second divider resistance and error amplifier, wherein：
The first end of first divider resistance is connected with the positive pole of the voltage output end, and the second of first divider resistance
End is connected with the first end of second divider resistance, and the second end of second divider resistance is negative with the voltage output end
Extremely it is connected, the positive input terminal of the error amplifier is connected with the second end of first divider resistance, the error amplifier
Negative input end access the first reference voltage, the output end of the error amplifier respectively with the controlled end of the voltage transformation unit and
3rd end of the pressure release unit is connected.
6. the circuit of voltage adjuster as claimed in claim 5, it is characterised in that the voltage transformation unit includes P-Power-
MOSFET(Positive channel-Power-Metal Oxide Semiconductor Field Effect
Transistor, P-channel power MOS field effect crystal) pipe, wherein, source electrode and the electricity of the P-Power-MOSFET pipes
The positive pole of input is pressed to be connected, the drain electrode of the P-Power-MOSFET pipes is connected with the positive pole of the voltage output end, described
The grid of P-Power-MOSFET pipes is connected with the output end of the error amplifier.
7. the circuit of voltage adjuster as claimed in claim 6, it is characterised in that
When the output voltage of the positive pole of the voltage output end is higher than predetermined threshold value, the positive input terminal of the error amplifier
The difference of voltage and first reference voltage increases, and then the output current of the output end of the error amplifier reduces, institute
The source electrode of P-Power-MOSFET pipes and the pressure drop increase of drain electrode are stated, and then the output voltage of the positive pole of the voltage output end subtracts
It is small；
When the output voltage of the positive pole of the voltage output end is less than predetermined threshold value, the positive input terminal of the error amplifier
The difference of voltage and first reference voltage reduces, and then the output current of the output end of the error amplifier increases, institute
The pressure drop of the source electrode and drain electrode of stating P-Power-MOSFET pipes reduces, and then the output voltage of the positive pole of the voltage output end increases
Greatly.
8. the circuit of voltage adjuster as claimed in claim 1, it is characterised in that the output end bag of the feedback control unit
Include the first output end and the second output end, the first output end of the feedback control unit and the controlled end phase of the voltage transformation unit
Even, the second output end of the feedback control unit is connected with the 3rd end of the pressure release unit,
The feedback control unit also includes the first divider resistance, the second divider resistance and digital comparator, wherein：
The first end of first divider resistance is connected with the positive pole of the voltage output end, and the second of first divider resistance
End is connected with the first end of second divider resistance, and the second end of second divider resistance is negative with the voltage output end
Extremely it is connected, the positive input terminal of the digital comparator is connected with the second end of first divider resistance, the digital comparator
Negative input end access the second reference voltage, the output end of the digital comparator respectively with the input of the digitial controller
The 3rd end with the pressure release unit is connected, and the output end of the digitial controller is connected with the controlled end of the voltage transformation unit.
9. the circuit of voltage adjuster as claimed in claim 8, it is characterised in that
When the output voltage of the positive pole of the voltage output end is higher than predetermined threshold value, the positive input terminal of the digital comparator
The difference of voltage and second reference voltage increases, and then the output voltage of the output end of the digital comparator increases, institute
Stating digitial controller will reduce the number of the PMOS of conducting, and total resistance increase of the PMOS of the conducting is described to lead
The source electrode of logical PMOS and the overall presure drop of drain electrode increase, and then the output voltage of the positive pole of the voltage output end reduces；
When the output voltage of the positive pole of the voltage output end is less than predetermined threshold value, the positive input terminal of the digital comparator
The difference of voltage and second reference voltage reduces, and then the output voltage of the output end of the digital comparator reduces, institute
Stating digitial controller will increase the number of the PMOS of conducting, and total resistance of the PMOS of the conducting is reduced, described to lead
The source electrode of logical PMOS and the overall presure drop of drain electrode reduce, and then the output voltage of the positive pole of the voltage output end increases.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410290251.8A CN104079177B (en) | 2014-06-24 | 2014-06-24 | A kind of circuit of voltage adjuster |
| PCT/CN2015/077506 WO2015196858A1 (en) | 2014-06-24 | 2015-04-27 | Circuit of voltage regulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410290251.8A CN104079177B (en) | 2014-06-24 | 2014-06-24 | A kind of circuit of voltage adjuster |
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| Publication Number | Publication Date |
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| CN104079177A CN104079177A (en) | 2014-10-01 |
| CN104079177B true CN104079177B (en) | 2017-06-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410290251.8A Active CN104079177B (en) | 2014-06-24 | 2014-06-24 | A kind of circuit of voltage adjuster |
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| CN (1) | CN104079177B (en) |
| WO (1) | WO2015196858A1 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104079177B (en) * | 2014-06-24 | 2017-06-20 | 华为技术有限公司 | A kind of circuit of voltage adjuster |
| JP6757857B2 (en) * | 2017-08-16 | 2020-09-23 | 華為技術有限公司Ｈｕａｗｅｉ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｃｏ．，Ｌｔｄ． | Voltage adjustment circuit |
| CN108319318B (en) * | 2018-04-09 | 2024-04-12 | 艾乐德电子（南京）有限公司 | Switching power supply and method with controllable output voltage instantaneous drop and jump amplitude |
| CN110738835B (en) * | 2019-11-12 | 2023-05-12 | 无锡蓝天电子股份有限公司 | Household fire alarm controller with upper computer communication interface function |
| CN112953311B (en) * | 2021-03-03 | 2022-04-26 | 珞石（北京）科技有限公司 | Hysteresis comparison voltage bleeder circuit |
| CN113655837A (en) * | 2021-07-23 | 2021-11-16 | 成都华微电子科技有限公司 | Linear voltage stabilizer with fast transient response |
| CN116073655A (en) * | 2023-01-28 | 2023-05-05 | 深圳通锐微电子技术有限公司 | Boost converter circuit |
| CN116054594B (en) * | 2023-04-01 | 2023-06-23 | 苏州美思迪赛半导体技术有限公司 | Switch power supply system with analog feedback and digital feedback |
| CN116056286B (en) * | 2023-04-03 | 2023-06-09 | 东莞锐视光电科技有限公司 | Method, device, medium and electronic equipment for reducing voltage drop of light source circuit |
| CN117348667B (en) * | 2023-11-07 | 2024-07-05 | 盛泽芯集成电路(无锡)有限公司 | Load switching transient enhanced ultralow static power consumption LDO circuit and working method |
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| US7671663B2 (en) * | 2006-12-12 | 2010-03-02 | Texas Instruments Incorporated | Tunable voltage controller for a sub-circuit and method of operating the same |
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| CN104079177B (en) * | 2014-06-24 | 2017-06-20 | 华为技术有限公司 | A kind of circuit of voltage adjuster |
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- 2014-06-24 CN CN201410290251.8A patent/CN104079177B/en active Active
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2015
- 2015-04-27 WO PCT/CN2015/077506 patent/WO2015196858A1/en active Application Filing
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| CN102148564A (en) * | 2010-02-10 | 2011-08-10 | 上海宏力半导体制造有限公司 | Voltage conversion circuit |
| CN101819448A (en) * | 2010-04-02 | 2010-09-01 | 上海北京大学微电子研究院 | Linear voltage regulator |
| CN202997918U (en) * | 2012-12-11 | 2013-06-12 | 深圳国微技术有限公司 | Power supply chip output voltage ripple suppression circuit |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2015196858A1 (en) | 2015-12-30 |
| CN104079177A (en) | 2014-10-01 |
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