CN105915046A - Charge pump control circuit - Google Patents
Charge pump control circuit Download PDFInfo
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- CN105915046A CN105915046A CN201610270416.4A CN201610270416A CN105915046A CN 105915046 A CN105915046 A CN 105915046A CN 201610270416 A CN201610270416 A CN 201610270416A CN 105915046 A CN105915046 A CN 105915046A
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- Prior art keywords
- voltage
- charge pump
- electric charge
- switching tube
- pole
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Classifications
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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
- H02M3/02—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
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
- H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
- H02M3/073—Charge pumps of the Schenkel-type
-
- 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
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
- H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
- H02M3/073—Charge pumps of the Schenkel-type
- H02M3/077—Charge pumps of the Schenkel-type with parallel connected charge pump stages
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a charge pump control circuit comprising a charge pump, a first feedback circuit and a second feedback circuit. The first feedback circuit is used for sampling the outputted voltage from the charge pump through a first feedback resistor string so as to obtain a first sampled voltage. The first sampled voltage is then compared to a reference voltage and according to the comparison result between the two, the outputted voltage is regulated. The second feedback circuit is used for sampling the outputted voltage from the charge pump through a second feedback resistor string so as to obtain a second sampled voltage. The voltage doubling mode of the charge pump is regulated according to the inputted voltage and the second sampled voltage. According to the invention, the voltage doubling mode of a charge pump can be regulated through a second feedback circuit, and in addition to that, the outputted voltage of the charge pump can be regulated through a first feedback circuit. These advantages make the charge pump control circuit applied more extensively.
Description
Technical field
The present invention relates to power-supply management system circuit engineering field, in particular, relate to a kind of electric charge pump
Control circuit.
Background technology
For portable functional product, the variation of function and the miniaturization trend requirement of volume
Power supply chip uses less package dimension, and therefore volume and area occupied to power supply IC propose higher
Requirement.In addition the height of cost performance also becomes the key factor of various chip product competition, and electric charge pump
Clear superiority on volume, cost, and electric charge pump is without inductance, overcomes power source based on inductance
The EMI problem that may bring so that it is application prospect is more extensive.In high efficiency, low-power consumption, low electromagnetism is done
Disturbing, in the power-supply management system of scalable output, electric charge pump is only choosing.
Electric charge pump needs to be controlled the mode of operation of electric charge pump by control electrical appliances for electric charge pump.Existing electric charge
Pump control circuit can only control the multiplication of voltage mode of operation of electric charge pump according to input voltage so that electric charge pump is not
Constant output voltage is exported under same multiplication of voltage mode of operation.
Owing to existing control electrical appliances for electric charge pump can only make electric charge pump export constant output voltage, it is impossible to
Realize the controllability of the output voltage of electric charge pump.
Summary of the invention
For solving the problems referred to above, the invention provides a kind of control electrical appliances for electric charge pump, described electric charge pump controls
Circuit can regulate the output voltage of electric charge pump,
To achieve these goals, the present invention provides following technical scheme:
A kind of control electrical appliances for electric charge pump, this control electrical appliances for electric charge pump includes:
A kind of control electrical appliances for electric charge pump, this control electrical appliances for electric charge pump includes:
Electric charge pump；
First feedback circuit, described first feedback circuit is used for by the first feedback resistance string described electric charge
The output voltage of pump is sampled, and obtains the first sampled voltage, and by described first sampled voltage and ginseng
The comparative result examining voltage regulates described output voltage；
Second feedback circuit, described second feedback circuit is used for by the second feedback resistance string described electric charge
The output voltage of pump is sampled, and obtains the second sampled voltage, and according to input voltage and described second
Sampled voltage regulates times die pressing type of described electric charge pump.
Optional, in above-mentioned control electrical appliances for electric charge pump, described electric charge pump has input interface, output
Interface, multiplication of voltage control interface and clock interface；
Described input interface is used for inputting described input voltage；
Described output interface is used for exporting described output voltage.
Optional, in above-mentioned control electrical appliances for electric charge pump, described first feedback resistance string includes: first
Resistance and the second resistance；Described first feedback circuit includes: described first resistance, described second resistance
And output voltage feedback control module；
First end of described first resistance is connected with described output interface, and its second end is by described second electricity
Resistance ground connection；
The first input end of described output voltage feedback control module connects with the first end of described first resistance
Connecing, its second input inputs described reference voltage, its outfan and the first of clocked logic control module
Input connects；
The outfan of described clocked logic control module is connected with described clock interface.
Optional, in above-mentioned control electrical appliances for electric charge pump, described second feedback resistance string includes: the 3rd
Resistance and the 4th resistance；Described second feedback circuit includes: described 3rd resistance, described 4th resistance
And electric charge pump multiplication of voltage mode control module；
First end of described 3rd feedback resistance is connected with described output interface, and its second end is by described the
Four resistance eutral groundings；
The first input end of described electric charge pump multiplication of voltage mode control module is connected with the first end of divider resistance,
Its second input is connected with the second end of described 3rd resistance, and its first outfan controls with described multiplication of voltage
Interface connects, and its second outfan is connected with the second input of described clocked logic control module；
Second end of described divider resistance inputs described input voltage.
Optional, in above-mentioned control electrical appliances for electric charge pump, described electric charge pump includes:
First switching tube, the first pole of described first switching tube is connected with described input interface, its second pole
It is connected with primary nodal point；
Second switch pipe, the first pole of described second switch pipe is connected with described primary nodal point, its second pole
It is connected with described output interface；
3rd switching tube, the first pole of described 3rd switching tube is connected with described input interface, its second pole
It is connected with secondary nodal point；
4th switching tube, the first pole of described 4th switching tube is connected with the 3rd node, its second pole and institute
State secondary nodal point to connect；
5th switching tube, the first pole of described 5th switching tube is connected with described input interface, its second pole
It is connected with described 3rd node；
6th switching tube, the first pole of described 6th switching tube is connected with described 3rd node, its second pole
It is connected with described output interface；
7th switching tube, the first pole of described 7th switching tube is connected with described input interface, its second pole
It is connected with fourth node；
8th switching tube, the first pole of described 8th switching tube is connected with described secondary nodal point, its second pole
Ground connection；
9th switching tube, the first pole of described 9th switching tube is connected with described fourth node, its second pole
Ground connection；
First pump electric capacity, a pole plate of described first pump electric capacity connects described primary nodal point, another pole
Plate connects described secondary nodal point；
Second pump electric capacity, a pole plate of described second pump electric capacity connects described 3rd node, another pole
Plate connects described fourth node；
The control end of all switching tubes is all connected with described clock interface.
Optional, in above-mentioned control electrical appliances for electric charge pump,
The substrate of described first switching tube is connected with described primary nodal point；
The substrate of described second switch pipe is connected with described output interface；
The substrate of described 3rd switching tube is connected with described input interface；
The substrate of described 4th switching tube is connected with described 3rd node；
The substrate of described 5th switching tube is with described；
The substrate of described 6th switching tube is connected with described output interface；
The substrate of described 7th switching tube is connected with described input interface；
The Substrate ground of described 8th switching tube；
The Substrate ground of described 9th switching tube.
Optional, in above-mentioned control electrical appliances for electric charge pump, described electric charge pump also includes: No. 2 selectores,
The control end input of described No. 2 selectores controls voltage, and its first input end inputs described output voltage,
Its second input is connected with described 3rd node, and its outfan is connected with the substrate of described 5th switching tube.
Optional, in above-mentioned control electrical appliances for electric charge pump, described electric charge pump has 1.5 multiplication of voltage mode of operations
And 2 multiplication of voltage mode of operations；
When described electric charge pump is in 1.5 multiplication of voltage mode of operation, described control voltage is low level, described 2
The outfan of road selector exports described output voltage；
When described electric charge pump is in 2 multiplication of voltage mode of operation, described control voltage is high level, described 2
The outfan of road selector exports the voltage of the 3rd node described in described output voltage.
Optional, in above-mentioned control electrical appliances for electric charge pump, described first switching tube, described second switch
Pipe, described 3rd switching tube, described 4th switching tube, described 5th switching tube, described 6th switching tube
And described 7th switching tube is PMOS；
Described 8th switching tube and described 9th switching tube are NMOS.
Optional, in above-mentioned control electrical appliances for electric charge pump, the 3rd of described clocked logic control module is defeated
Enter end to be connected with agitator.
By foregoing description, the control electrical appliances for electric charge pump that the present invention provides includes: electric charge pump；First
Feedback circuit, described first feedback circuit is for by the output to described electric charge pump of the first feedback resistance string
Voltage is sampled, and obtains the first sampled voltage, and by described first sampled voltage and reference voltage
Comparative result regulates described output voltage；Second feedback circuit, described second feedback circuit is for by the
The output voltage of described electric charge pump is sampled by two feedback resistance strings, obtains the second sampled voltage, and root
Times die pressing type of described electric charge pump is regulated according to input voltage and described second sampled voltage.Described electric charge pump
Control circuit can be by times die pressing type of the second feedback circuit regulation electric charge pump, it is also possible to anti-by first
The output voltage of current feed circuit regulation electric charge pump, the scope of application of described control electrical appliances for electric charge pump is wider.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to reality
Execute the required accompanying drawing used in example or description of the prior art to be briefly described, it should be apparent that below,
Accompanying drawing in description is only embodiments of the invention, for those of ordinary skill in the art, not
On the premise of paying creative work, it is also possible to obtain other accompanying drawing according to the accompanying drawing provided.
The structural representation of a kind of control electrical appliances for electric charge pump that Fig. 1 provides for the embodiment of the present invention；
Fig. 2 is the multiplication of voltage patten transformation schematic diagram of control electrical appliances for electric charge pump shown in Fig. 1；
The circuit diagram of a kind of electric charge pump that Fig. 3 provides for the embodiment of the present invention.
Detailed description of the invention
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
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the present invention, and
It is not all, of embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art are not doing
Go out the every other embodiment obtained under creative work premise, broadly fall into the scope of protection of the invention.
The output voltage of existing control electrical appliances for electric charge pump is fixed value, generally by contrast input voltage
Sentence with reference voltage and select applicable multiplication of voltage mode of operation, it is impossible to the power that electric charge pump is completely eliminated is opened
Close the impact of the bulk effect of pipe.Owing to existing control electrical appliances for electric charge pump can only export a fixed voltage value,
Then operation strategies can be the most limited, is not suitable for the adjustable applicable cases of output voltage.And due to existing electricity
Lotus pump control circuit can not be completely eliminated the effect of bulk effect of power switch pipe, power switch pipe threshold voltage
Relatively big, thus conversion efficiency and the driving force of this electric charge pump can be reduced.
The embodiment of the present invention is for the fixing output voltage values of existing control electrical appliances for electric charge pump, body effect
Impact, driving force is not enough, the problem that conversion efficiency is relatively low, it is provided that a kind of have double loop feedback
Output voltage is adjustable, can eliminate the control electrical appliances for electric charge pump of effect of bulk effect.
In order to solve the problems referred to above, embodiments provide a kind of control electrical appliances for electric charge pump, this electric charge
Pump control circuit includes:
Electric charge pump；
First feedback circuit, described first feedback circuit is used for by the first feedback resistance string described electric charge
The output voltage of pump is sampled, and obtains the first sampled voltage, and by described first sampled voltage and ginseng
The comparative result examining voltage regulates described output voltage；
Second feedback circuit, described second feedback circuit is used for by the second feedback resistance string described electric charge
The output voltage of pump is sampled, and obtains the second sampled voltage, and according to input voltage and described second
Sampled voltage regulates times die pressing type of described electric charge pump.
Visible, described control electrical appliances for electric charge pump can be by times pressing mold of the second feedback circuit regulation electric charge pump
Formula, it is also possible to by the output voltage of the first feedback circuit regulation electric charge pump, described control electrical appliances for electric charge pump
The scope of application wider.
Technical scheme in order to make the embodiment of the present invention provide is clearer, below in conjunction with the accompanying drawings to above-mentioned side
Case is described in detail.
With reference to the structural representation of a kind of control electrical appliances for electric charge pump that Fig. 1, Fig. 1 provide for the embodiment of the present invention,
Described control electrical appliances for electric charge pump includes: electric charge pump 11；First feedback circuit, described first feedback circuit is used
In by the first feedback resistance string, output voltage VO UT of described electric charge pump 11 being sampled, obtain the
One sampled voltage FB1, and tied by the comparison of described first sampled voltage FB1 and reference voltage VREF
Fruit regulates described output voltage VO UT；Second feedback circuit, described second feedback circuit is for by the
Output voltage VO UT of described electric charge pump 11 is sampled by two feedback resistance strings, obtains the second sampling electricity
Pressure FB2, and regulate described electric charge pump 11 according to input voltage VIN and described second sampled voltage FB2
Times die pressing type.
As it is shown in figure 1, described electric charge pump 11 has input interface D1, output interface D2, multiplication of voltage control
Interface D3 and clock interface D4；Described input interface is used for inputting described input voltage VIN；Described
Output interface D2 is used for exporting described output voltage VO UT.Optionally, described electric charge pump 11 is 1.5X/2X
Adaptive charge pump.Described electric charge pump 11 has 1.5 multiplication of voltage mode of operations and 2 multiplication of voltage mode of operations.
Wherein, 1.5X represents 1.5 multiplication of voltage mode of operations, and 2X represents 2 multiplication of voltage mode of operations.
Optionally, described first feedback resistance string includes: the first resistance R1 and the second resistance R2；Institute
State the first feedback circuit to include: described first resistance R1, described second resistance R2 and output voltage are anti-
Feedback control module 14.First end of described first resistance R1 is connected with described output interface D2, and it is second years old
End is by described second resistance R2 ground connection.The first input end of described output voltage feedback control module 14
Being connected with first end of described first resistance R1, its second input inputs described reference voltage VREF,
Its outfan is connected with the first input end of clocked logic control module 13.Described clocked logic control module
The outfan of 14 is connected with described clock interface D4.Described electric charge pump 11 includes multiple switching tube.Optional
, described switching tube is power switch pipe.Described clocked logic control module 13 can be by time corresponding
Clock signal controls the on off state of the plurality of switching tube.
Described first resistance R1 is adjustable resistance, and its resistance size is by many bit Digital Signals.Pass through
The resistance size of regulation R1, can set the regulation of output voltage VO UT by regulating the first resistance R1
Scope.R1 is adjustable resistance, and resistance size is by Digital Signals, such as when control signal is 000,
Output voltage is minimum, and the resistance of R1 at this moment is minimum；When being 111 such as control signal, output voltage is
Height, the resistance of R1 at this moment is maximum.
Optionally, described second feedback resistance string includes the 3rd resistance R3 and the 4th resistance R4.Described
Second feedback circuit includes: described 3rd resistance R3, described 4th resistance R4 and electric charge pump times pressing mold
Formula control module 12.First end of described 3rd feedback resistance R3 is connected with described output interface D2, its
Second end passes through described 4th resistance R4 ground connection.The first of described electric charge pump multiplication of voltage mode control module 12
Input is connected with first end of divider resistance R5, the of its second input and described 3rd resistance R3
Two ends connect, and its first outfan controls interface D3 with described multiplication of voltage and is connected, and its second outfan is with described
Second input of clocked logic control module 13 connects.Second end of described divider resistance R5 inputs institute
Stating input voltage VIN, its first end passes through divider resistance R6 ground connection.Described electric charge pump multiplication of voltage Schema control
Module 12 output controls voltage VMODE, for controlling times die pressing type of electric charge pump 11.
Described clocked logic controls the 3rd input of mould 13 pieces and is connected with agitator 15.Shaken by described
Swing device 15 and generate square-wave signal.Described clocked logic control mould 13 is according to described square-wave signal, during generation
Clock signal.
Optionally, described control electrical appliances for electric charge pump also includes output capacitance Cout.Described output capacitance Cout
A pole plate be connected with described output interface D2, another pole plate ground connection.Described control electrical appliances for electric charge pump
Also include that mono-pole plate of electrical power by-pass electric capacity Cin, described electrical power by-pass electric capacity Cin inputs described input voltage
VIN, another pole plate ground connection.
Below to the Principles of Regulation of the multiplication of voltage mode of operation of control electrical appliances for electric charge pump described in the embodiment of the present invention with
And the Principles of Regulation of the output voltage of electric charge pump are specifically described.
In control electrical appliances for electric charge pump shown in Fig. 1, output voltage feedback control module 14 is by adjustable the
Output voltage VO UT is sampled by one feedback resistance string, obtains the first sampled voltage FB1.Output electricity
Pressure feedback control module 14 has the first comparator, by described first comparator by the first sampled voltage
FB1 compares with reference voltage VREF, if the first sampled voltage FB1 is higher than reference voltage VREF, the
One comparator output high level then can all close to clock Logic control module 13, the switching tube of electric charge pump 11
Disconnected, electric charge pump 11 stops charging to output capacitance Cout.
When the switching tube of electric charge pump 11 is all off, output capacitance Cout provide electric current to load,
I.e. provide output voltage VO UT by the electric discharge of output capacitance Cout, along with the electric discharge of output capacitance Cout,
Output voltage VO UT is gradually lowered, until current first sampled voltage FB1 is less than reference voltage VREF.
When the first sampled voltage FB1 is less than reference voltage VREF, the first comparator output low level is to clock
Logic control module 13, electric charge pump 11 starts power up, i.e. electric charge pump 11 starts normally to work, to output
Electric capacity Cout charges, and is load supplying, until output voltage VO UT is higher than preset voltage value.Wherein,
Load is connected with output interface.So, output voltage VO UT can be centered by default magnitude of voltage on
Lower fuctuation within a narrow range.
Concrete, when the first comparator judges the first sampled voltage FB1 higher than reference voltage VREF,
Charge pump switches is all off, and at this moment output voltage VO UT reduces, when output voltage VO UT drops to the
When one sampled voltage FB1 is less than reference voltage VREF, electric charge pump 11 can be reworked again, so be exported
Voltage VOUT will be centered by predetermined magnitude of voltage, upper and lower fuctuation within a narrow range, output voltage VO UT ripple
Dynamic amplitude depends on offset voltage and the loop reaction speed of the first comparator.
By foregoing description, control electrical appliances for electric charge pump described in the embodiment of the present invention can be according to sampling electricity
The size of different adjustment output voltage VO UT of pressure, output voltage VO UT can described lower limit with
The voltage range regulation that described higher limit limits.The regulation process of above-mentioned output voltage is pulse skipping modulation,
Also it is simultaneously that the scope of output voltage is adjusted by the Article 1 feedback branch of described control electrical appliances for electric charge pump
Operation principle.The regulation of output voltage VO UT can be set by the size regulating the first resistance R1
Scope.
Second feedback circuit is right by the second feedback resistance string (the 3rd resistance R3 and the 4th resistance R4)
Output voltage VO UT of described electric charge pump is sampled, and obtains the second sampled voltage FB2.Electric charge pump times
Die pressing type control module 12 includes second comparator with lag function, and described second comparator is used for will
Second sampled voltage FB2 and the 3rd sampled voltage FB3 compares.
Optionally, the second sampled voltage FB2 is the 66.7% of output voltage VO UT.3rd feedback resistance
Input voltage VIN is sampled by string, obtains described 3rd sampled voltage FB3.Described 3rd sampling electricity
Pressure FB3 can be the 90% of input voltage VIN.Described 3rd feedback resistance string includes described branch pressure voltage
R5 and divider resistance R6.Can set by arranging the ratio of the 3rd resistance R3 and the 4th resistance R4
Fixed second sampled voltage FB2, can be by arranging dividing potential drop electricity relative to the percentage ratio of output voltage VO UT
The ratio of resistance R5 and divider resistance R6 sets the 3rd sampled voltage FB3 relative to input voltage VIN
Percentage ratio, can design the second sampled voltage FB2 percentage relative to output voltage VO UT as required
Than and the 3rd sampled voltage FB3 relative to the percentage ratio of input voltage VIN, it is not limited to the present invention
The numerical value that embodiment is illustrated.
Initial time, electric charge pump 11 starts power up, and electric charge pump multiplication of voltage mode control module 12 controls electric charge
Pump 11 is first in 1.5 multiplication of voltage mode of operations, and the second sampled voltage FB2 is equal to 66.7%*VOUT.If
66.7%*VOUT is less than 95%*VIN, and output voltage VO UT has reached preset voltage value, electric charge
Pump multiplication of voltage mode control module 12 selects to control electric charge pump 11 and continues under 1.5 multiplication of voltage mode of operations, for electricity
Lotus pump charges, and electric charge pump generates output voltage.Second comparator is hysteresis comparator, has retarding window,
When the second sampled voltage FB2 with 90%*VIN compares, it is output as height if desired for making the second comparator
Level, then the second sampled voltage FB2 95%*VIN to be exceeded, if desired for the output making the second comparator
For low level, then the second sampled voltage FB2 85%*VIN to be less than, the second comparator centered by 90%,
The retarding window of positive and negative 5%.
If 95%*1.5*VIN is still below preset voltage value, then electric charge pump 11 can be in 1.5 multiplication of voltage mode of operations
Lower continuation is charged, until sampling and outputting voltage 66.7%*VOUT is more than 95%*VIN, now, electric charge pump
Multiplication of voltage mode control module 12 can select to control electric charge pump and charge under 2 multiplication of voltage mode of operations, produces output
Voltage.When electric charge pump 11 is at 2 multiplication of voltage mode of operation, when output voltage VO UT reduces or defeated
Enter voltage VIN to raise, then can be under 2 multiplication of voltage mode of operations, electric charge pump multiplication of voltage mode control module 12 is sentenced
Break and output voltage VO UT higher than preset voltage value, and control electric charge pump 11 and stop to output capacitance Cout
Charging, until output voltage VO UT drops to lower limit.If corresponding sampled voltage 66.7%*VOUT is low
In 85%*VIN, now, electric charge pump multiplication of voltage mode control module 12 can select to control electric charge pump at 1.5 times
Charge under pressure mode of operation, produce output voltage VO UT.
As it is shown in figure 1, unlike existing control electrical appliances for electric charge pump scheme, described in the embodiment of the present invention
Output voltage VO UT of control electrical appliances for electric charge pump is adjustable, and output voltage VO UT has certain
Output area.In described control electrical appliances for electric charge pump exist 2 feedback circuits, Article 1 feedback circuit be by
First feedback resistance string, output voltage feedback control module 14, clocked logic control module 14 and electric charge
Pump 11 forms.Article 2 feedback circuit is by the second feedback resistance string, electric charge pump multiplication of voltage mode control module
12, clocked logic control module 14 and electric charge pump 11 form.
Wherein, resistance R1 is adjustable resistor, and its resistance is by many bit Digital Signals, thus meeting
Export adjustable output voltage VO UT.Output voltage VO UT expression formula is:
Article 2 feedback circuit is by being compared by the second sampled voltage FB2 and the 3rd sampled voltage FB3,
Control electric charge pump 11 according to comparative result and be in suitable times of die pressing type.General, the second sampling electricity is set
Pressure FB2=VOUT/1.5=66.7%*VOUT.3rd sampled voltage FB3=90%*VIN is set.
With reference to the multiplication of voltage patten transformation schematic diagram that Fig. 2, Fig. 2 are control electrical appliances for electric charge pump shown in Fig. 1.Such as figure
Shown in 2, when output voltage is relatively low or input voltage is higher, i.e. output voltage is not higher than 95%*1.5*VIN,
Electric charge pump multiplication of voltage mode control module can select to control electric charge pump and be in 1.5 multiplication of voltage mode of operations；Along with output
The rising of voltage or the reduction of input voltage, output voltage is higher than 95%*1.5*VIN, then electric charge pump multiplication of voltage
Mode control module can select to control electric charge pump and be in 2 multiplication of voltage mode of operations；It is in 2 multiplication of voltages at electric charge pump
During mode of operation, if output voltage reduces or input voltage raises, when output voltage is less than
85%*1.5*VIN, then electric charge pump multiplication of voltage mode control module can select to control electric charge pump and be in 1.5 multiplication of voltage works
Operation mode.
By foregoing description, control electrical appliances for electric charge pump described in the embodiment of the present invention, by output voltage
VOUT is designed as the adjustable output voltage of many bit, has bigger output voltage range, simultaneously improves
The multiplication of voltage mode selection mechanism of electric charge pump.The multiplication of voltage mode selection mechanism of existing control electrical appliances for electric charge pump is
By contrast input voltage and reference voltage, the change of monitoring input voltage selects a times die pressing type.And this
The multiplication of voltage mode selection mechanism of the control electrical appliances for electric charge pump of inventive embodiments is with defeated by contrast input voltage
Going out voltage, monitoring input voltage and output voltage size judge to select the output voltage selected by being suitable for
Times die pressing type so that the size scalable of output voltage.
And control electrical appliances for electric charge pump described in the embodiment of the present invention controls for combining complementary 2 multiplication of voltage electric charge pumps
Circuit and 1.5 multiplication of voltage control electrical appliances for electric charge pump circuit, described control electrical appliances for electric charge pump is adaptive charge pump electricity
Road, can be automatically adjusted a times die pressing type according to output voltage and input voltage.Described in the embodiment of the present invention
Control electrical appliances for electric charge pump is higher than the driving force of existing 2 multiplication of voltage control electrical appliances for electric charge pump, and output ripple
Output ripple far below existing 2 multiplication of voltage control electrical appliances for electric charge pump.
With reference to the circuit diagram of a kind of electric charge pump that Fig. 3, Fig. 3 provide for the embodiment of the present invention, shown electric charge pump
Including: the first switching tube M1, second switch pipe M2, the 3rd switching tube M3, the 4th switching tube M4,
5th switching tube M5, the 6th switching tube M6, the 7th switching tube M7, the 8th switching tube M8, the 9th open
Close pipe M9, the first pump electric capacity C1 and the second pump electric capacity C2.
Described first pole of the first switching tube M1 is connected with the input interface of electric charge pump, its second pole and first
1. node connects.1. first pole of described second switch pipe M2 be connected with described primary nodal point, its second pole
It is connected with the output interface of electric charge pump.First pole of described 3rd switching tube M3 is with described input interface even
Connecing, 2. its second pole be connected with secondary nodal point.First pole of described 4th switching tube M4 is with the 3rd node 3.
Connecting, 2. its second pole be connected with described secondary nodal point.First pole of described 5th switching tube M5 is with described
Input interface connects, and 3. its second pole be connected with described 3rd node.The first of described 6th switching tube M6
3. pole be connected with described 3rd node, and its second pole is connected with described output interface.Described 7th switching tube
First pole of M7 is connected with described input interface, and 4. its second pole be connected with fourth node.Described 8th opens
2. the first pole closing pipe M8 be connected with described secondary nodal point, its second pole ground connection.Described 9th switching tube
4. first pole of M9 be connected with described fourth node, its second pole ground connection.Described first pump electric capacity C1's
1. one pole plate connects described primary nodal point, and 2. another pole plate connects described secondary nodal point.Described second
3. one pole plate of pump electric capacity C2 connects described 3rd node, and another pole plate connects described fourth node
④.The end that controls of all switching tubes is all connected with the clock interface of described electric charge pump.
In order to eliminate the bulk effect of each pipe that opens the light, the substrate of described first switching tube M1 and described first segment
Point connects；The substrate of described second switch pipe M2 is connected with described output interface；Described 3rd switching tube
The substrate of M3 is connected with described input interface；The substrate of described 4th switching tube M4 and described 3rd node
Connect；The substrate of described 5th switching tube M5 is with described；The substrate of described 6th switching tube M6 is with described
Output interface connects；The substrate of described 7th switching tube M7 is connected with described input interface；Described 8th opens
Close the Substrate ground of pipe M8；The Substrate ground of described 9th switching tube M9.
Described electric charge pump also includes: No. 2 selectores 31, the control end input control of described No. 2 selectores 31
Voltage VMODE processed, its first input end inputs described output voltage, its second input and described the
3. three nodes connect, and its outfan is connected with the substrate of described 5th switching tube M5.Described No. 2 selectores
The control end of 31 and multiplication of voltage control interface and are connected, so with the electric charge pump times die pressing type of control electrical appliances for electric charge pump
Control module connects.
When described electric charge pump is in 1.5 multiplication of voltage mode of operation, described control voltage VMODE is low electricity
Flat, the outfan of described No. 2 selectores exports described output voltage VO UT.When described electric charge pump is in 2
During multiplication of voltage mode of operation, described control voltage VMODE is high level, the output of described No. 2 selectores
End exports the 3rd node voltage 3. described in described output voltage.
Optionally, described first switching tube M1, described second switch pipe M2, described 3rd switching tube
M3, described 4th switching tube M4, described 5th switching tube M5, described 6th switching tube M6 and institute
State the 7th switching tube M7 and be PMOS；Described 8th switching tube M8 and described 9th switching tube M9
It is NMOS.In the embodiment of the present invention, the one of the first electrode and the second electrode represents the source of MOS
Pole, another one represents the drain electrode of MOS.
Charge pump circuit shown in Fig. 3 is made up of 9 switching tubes and 2 pump electric capacity.In Fig. 3, Cin is electricity
Source shunt capacitance, C1, C2 are pump electric capacity, and Cout is output capacitance.
The control end of all switching tubes connects clock interface, by two clock signals with complementary phases
CK1 and CK2 controls, by the unlatching under out of phase of 9 switching tubes in control Fig. 3 circuit
Or turn off, it is possible to achieve 2 kinds of ideal voltage gain values.Under the control of clock signal CK1 and CK2,
Under different multiplication of voltage mode of operations, the switching tube needing Guan Bi is as shown in table 1.
Table 1
| The perfect Gain | The switching tube of Guan Bi during CK1 | The switching tube of Guan Bi during CK2 |
| 1.5 multiplication of voltage mode of operations | M1、M4、M9 | M2、M3、M6、M7 |
| 2 multiplication of voltage mode of operations | M1、M6、M7、M8 | M2、M3、M5、M9 |
As it is shown on figure 3, the substrate electric potential of all PMOS in this adaptive charge pump circuit is received each
One end relatively high in the source and drain two ends of pipe, the substrate electric potential of all NMOS receives the source of respective pipe
One end that in leakage two ends, current potential is relatively low.
Owing to the 5th switching tube M5 is off under 1.5 multiplication of voltage mode of operations always, then its substrate
Electricity, for should connect maximum potential, i.e. connects output current potential.And under 2 multiplication of voltage mode of operations the 5th switching tube M5
Opening it is in, then in order to eliminate the 5th switching tube M5 body effect in conducting phase in half period
Should, then its substrate electric potential connect M5 need be connected with pump electric capacity C2 so that the 5th switching tube M5 substrate and
One end that in its source and drain two ends, current potential is of a relatively high connects.Owing to being in the 5th switch under different times die pressing type
The substrate electric potential of pipe M5 connects difference, in order to the 5th switching tube M5 affects at conducting phase not receptor effect
Its conducting resistance, does not allow owing to the Under Positive Substrate Bias of the 5th switching tube M5 causes the 5th switch in off-phases
Pipe M5 turns on electric leakage, then need the substrate electric potential making the 5th switching tube M5 to become with the change of die pressing type again
Change, as it is shown on figure 3, control the 5th by No. 2 selectores 31 controlled by multiplication of voltage mode signal
Switching tube M5 substrate electric potential.When 1.5 multiplication of voltage mode of operation, No. 2 selectores 31 can select substrate electric potential
Access output voltage VO UT；When 2 multiplication of voltage mode of operation, No. 2 selectores 31 can select substrate electric potential
It is linked into one end that M5 is connected with pump electric capacity C2.
Electric charge pump described in the embodiment of the present invention is 2 complementary multiplication of voltage electric charge pumps and 1.5 multiplication of voltage electric charge pumps are tied mutually
The adaptive charge pump closed.Output voltage in electric charge pump described in the embodiment of the present invention and existing electric charge pump and
Output impedance is as shown in table 2 below.
Wherein, RiThe equivalent resistance of electric charge pump when turning on for all switching tubes in electric charge pump.C1/2For electric charge pump
The first pump electric capacity or the capacitance of the second pump electric capacity.First pump electric capacity and the capacitance of the second pump electric capacity
Identical.F is the frequency of clock signal.IloadFor load current.
Electric charge pump described in the embodiment of the present invention is for bulk effect problem present in current electric charge pump, by electric charge
One end that current potential that the substrate electric potential of all switching tubes of pump is connected in the two ends of respective metal-oxide-semiconductor is higher,
During switching tube conducting, Vbs is 0, thus eliminates effect of bulk effect, and threshold voltage will not increase, electric conduction
Resistance will not increase.As above table 2 understands, owing to described in the embodiment of the present invention, electric charge pump considers bulk effect pair
The impact of switching tube conducting resistance, therefore the output impedance R of electric charge pump described in the embodiment of the present inventionOUTCan be remote
Output impedance R less than existing electric charge pumpOUT, so the driving force of electric charge pump described in the embodiment of the present invention
Higher, under identical driving current conditions, described in the embodiment of the present invention, the conversion efficiency of electric charge pump is higher.
By foregoing description, the control electrical appliances for electric charge pump that the embodiment of the present invention provides can be automatically adjusted
The size of the output voltage of electric charge pump, goes for needing the application scenarios of different output voltage；Simultaneously
Eliminate the bulk effect of electric charge pump, improve driving force and conversion efficiency.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses
The present invention.Multiple amendment to these embodiments will be aobvious and easy for those skilled in the art
See, generic principles defined herein can without departing from the spirit or scope of the present invention,
Realize in other embodiments.Therefore, the present invention is not intended to be limited to the embodiments shown herein,
And it is to fit to the widest scope consistent with principles disclosed herein and features of novelty.
Claims (10)
1. a control electrical appliances for electric charge pump, it is characterised in that including:
Electric charge pump；
First feedback circuit, described first feedback circuit is used for by the first feedback resistance string described electric charge
The output voltage of pump is sampled, and obtains the first sampled voltage, and by described first sampled voltage and ginseng
The comparative result examining voltage regulates described output voltage；
Second feedback circuit, described second feedback circuit is used for by the second feedback resistance string described electric charge
The output voltage of pump is sampled, and obtains the second sampled voltage, and according to input voltage and described second
Sampled voltage regulates times die pressing type of described electric charge pump.
Control electrical appliances for electric charge pump the most according to claim 1, it is characterised in that described electric charge pump has
Input interface, output interface, multiplication of voltage is had to control interface and clock interface；
Described input interface is used for inputting described input voltage；
Described output interface is used for exporting described output voltage.
Control electrical appliances for electric charge pump the most according to claim 2, it is characterised in that described first feedback
Resistance string includes: the first resistance and the second resistance；Described first feedback circuit includes: described first electricity
Resistance, described second resistance and output voltage feedback control module；
First end of described first resistance is connected with described output interface, and its second end is by described second electricity
Resistance ground connection；
The first input end of described output voltage feedback control module connects with the first end of described first resistance
Connecing, its second input inputs described reference voltage, its outfan and the first of clocked logic control module
Input connects；
The outfan of described clocked logic control module is connected with described clock interface.
Control electrical appliances for electric charge pump the most according to claim 3, it is characterised in that described second feedback
Resistance string includes: the 3rd resistance and the 4th resistance；Described second feedback circuit includes: described 3rd electricity
Resistance, described 4th resistance and electric charge pump multiplication of voltage mode control module；
First end of described 3rd feedback resistance is connected with described output interface, and its second end is by described the
Four resistance eutral groundings；
The first input end of described electric charge pump multiplication of voltage mode control module is connected with the first end of divider resistance,
Its second input is connected with the second end of described 3rd resistance, and its first outfan controls with described multiplication of voltage
Interface connects, and its second outfan is connected with the second input of described clocked logic control module；
Second end of described divider resistance inputs described input voltage.
Control electrical appliances for electric charge pump the most according to claim 2, it is characterised in that described electric charge pump bag
Include:
First switching tube, the first pole of described first switching tube is connected with described input interface, its second pole
It is connected with primary nodal point；
Second switch pipe, the first pole of described second switch pipe is connected with described primary nodal point, its second pole
It is connected with described output interface；
3rd switching tube, the first pole of described 3rd switching tube is connected with described input interface, its second pole
It is connected with secondary nodal point；
4th switching tube, the first pole of described 4th switching tube is connected with the 3rd node, its second pole and institute
State secondary nodal point to connect；
5th switching tube, the first pole of described 5th switching tube is connected with described input interface, its second pole
It is connected with described 3rd node；
6th switching tube, the first pole of described 6th switching tube is connected with described 3rd node, its second pole
It is connected with described output interface；
7th switching tube, the first pole of described 7th switching tube is connected with described input interface, its second pole
It is connected with fourth node；
8th switching tube, the first pole of described 8th switching tube is connected with described secondary nodal point, its second pole
Ground connection；
9th switching tube, the first pole of described 9th switching tube is connected with described fourth node, its second pole
Ground connection；
First pump electric capacity, a pole plate of described first pump electric capacity connects described primary nodal point, another pole
Plate connects described secondary nodal point；
Second pump electric capacity, a pole plate of described second pump electric capacity connects described 3rd node, another pole
Plate connects described fourth node；
The control end of all switching tubes is all connected with described clock interface.
Control electrical appliances for electric charge pump the most according to claim 5, it is characterised in that
The substrate of described first switching tube is connected with described primary nodal point；
The substrate of described second switch pipe is connected with described output interface；
The substrate of described 3rd switching tube is connected with described input interface；
The substrate of described 4th switching tube is connected with described 3rd node；
The substrate of described 5th switching tube is with described；
The substrate of described 6th switching tube is connected with described output interface；
The substrate of described 7th switching tube is connected with described input interface；
The Substrate ground of described 8th switching tube；
The Substrate ground of described 9th switching tube.
Control electrical appliances for electric charge pump the most according to claim 5, it is characterised in that described electric charge pump is also
Including: No. 2 selectores, the control end input of described No. 2 selectores controls voltage, and its first input end is defeated
Entering described output voltage, its second input is connected with described 3rd node, its outfan and the described 5th
The substrate of switching tube connects.
Control electrical appliances for electric charge pump the most according to claim 7, it is characterised in that described electric charge pump has
There are 1.5 multiplication of voltage mode of operations and 2 multiplication of voltage mode of operations；
When described electric charge pump is in 1.5 multiplication of voltage mode of operation, described control voltage is low level, described 2
The outfan of road selector exports described output voltage；
When described electric charge pump is in 2 multiplication of voltage mode of operation, described control voltage is high level, described 2
The outfan of road selector exports the voltage of the 3rd node described in described output voltage.
Control electrical appliances for electric charge pump the most according to claim 5, it is characterised in that described first switch
Pipe, described second switch pipe, described 3rd switching tube, described 4th switching tube, described 5th switching tube,
Described 6th switching tube and described 7th switching tube are PMOS；
Described 8th switching tube and described 9th switching tube are NMOS.
Control electrical appliances for electric charge pump the most according to claim 2, it is characterised in that described clock is patrolled
The 3rd input collecting control module is connected with agitator.
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| CN108347162A (en) * | 2017-01-24 | 2018-07-31 | 意法半导体股份有限公司 | Circuit for operating charge pump and method |
| CN108880233A (en) * | 2018-08-03 | 2018-11-23 | 上海艾为电子技术股份有限公司 | A kind of charge pump circuit |
| CN111740588A (en) * | 2019-03-25 | 2020-10-02 | 罗富尧 | Built-in voltage multiplier in microcontroller unit of single battery remote controller for long distance infrared and low power consumption Bluetooth low energy transmission |
| CN111817553A (en) * | 2020-07-01 | 2020-10-23 | 浙江驰拓科技有限公司 | On-chip charge pump circuit |
| EP3631963A4 (en) * | 2017-05-31 | 2020-12-16 | Intuitive Surgical Operations Inc. | Electrosurgical output stage with integrated dc regulator |
| CN113672017A (en) * | 2021-08-06 | 2021-11-19 | 成都华微电子科技有限公司 | Self-adaptive mode switching charge pump |
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| CN107957770A (en) * | 2016-10-14 | 2018-04-24 | 国民技术股份有限公司 | A kind of Voltagre regulator and terminal device |
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| US11489443B2 (en) | 2020-03-12 | 2022-11-01 | Changxin Memory Technologies, Inc. | Charge pump circuit |
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| CN113965075A (en) * | 2021-10-26 | 2022-01-21 | 武汉市聚芯微电子有限责任公司 | Charge pump circuitry |
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