CN109217826A - A kind of amplifier compensation circuit of built-in capacitance - Google Patents
A kind of amplifier compensation circuit of built-in capacitance Download PDFInfo
- Publication number
- CN109217826A CN109217826A CN201811187141.3A CN201811187141A CN109217826A CN 109217826 A CN109217826 A CN 109217826A CN 201811187141 A CN201811187141 A CN 201811187141A CN 109217826 A CN109217826 A CN 109217826A
- Authority
- CN
- China
- Prior art keywords
- module
- compensating electric
- electric capacity
- compensation circuit
- analog
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000006243 chemical reaction Methods 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 5
- 239000003990 capacitor Substances 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 230000002457 bidirectional effect Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/08—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements
- H03F1/14—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements by use of neutralising means
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
Abstract
The invention belongs to amplifier compensation technique fields, provide a kind of amplifier compensation circuit of built-in capacitance, on the one hand the voltage signal exported by operational amplifying module carries out charge or discharge to compensating electric capacity, on the other hand count signal is exported after comparison module, so that two-way counting module carries out counting action according to the count signal within a preset time, the digital signal generated after counting is converted to analog signal by analog-to-digital conversion module and is exported, the variable quantity for the analog signal for ensuring to export is preset value, be at the same time in compensating electric capacity from zero load to fully charged or from fully charged to zero load, it only needs to can be realized using the compensating electric capacity compared with low capacity；The compensating electric capacity can be designed in integrated circuit simultaneously, it promotes reliability and reduces cost, therefore the problem of solving existing amplifier compensation circuit, there is compensating electric capacities to be integrated on chip, can be only put on the external circuit board, causes occupied space big and increased costs.
Description
Technical field
The invention belongs to amplifier compensation technique fields, more particularly to a kind of amplifier compensation circuit of built-in capacitance.
Background technique
Fig. 1 is the schematic diagram of amplifier compensation circuit conventional in the prior art, wherein Vref is benchmark voltage, the voltage
It being fixed and invariable, Vfb is external feedback signal, when external feedback signal Vfb is lower than reference voltage Vref, output voltage
Vout rises；Conversely, output voltage Vout voltage declines.In order to eliminate alternating current working frequency ripple wave (50Hz or rectification after
100Hz), compensating electric capacity Ccomp usually requires the magnitude of 1uf or so, and the capacitor of this magnitude is can not to be integrated on chip, only
It can be placed on the external circuit board.
Meanwhile Fig. 2 is the equivalent circuit diagram of Fig. 1, i.e. amplifier can be equivalent to two current sources, and one is reference current source
Isource=K*Vref is a fixed pull-up current；The other is pull-down current source Isink=K*Vfb, be one with
External feedback signal Vfb directly proportional electric current.When external feedback signal Vfb is lower than reference voltage Vref, Isink <
Isource, net current give compensating electric capacity Ccomp charging, and Vout voltage rises, on the contrary then decline.Since Isouece is generally several
Microampere is to tens microamperes, therefore compensating electric capacity Ccomp usually requires uF rank.
Therefore, there is compensating electric capacities to be integrated on chip for existing amplifier compensation circuit, can be only put at external electrical
On the plate of road, the problem of causing occupied space big and increased costs.
Summary of the invention
The purpose of the present invention is to provide a kind of amplifier compensation circuits of built-in capacitance, it is intended to solve existing amplifier compensation
There is compensating electric capacities to be integrated on chip for circuit, can be only put on the external circuit board, causes occupied space big and cost
The problem of increase.
The present invention provides a kind of amplifier compensation circuit of built-in capacitance, the amplifier compensation circuit includes:
Operational amplifying module, comparison module, two-way counting module, analog-to-digital conversion module, restoration module and compensating electric capacity；
The operational amplifying module is connected with the compensating electric capacity, the comparison module and the restoration module respectively
It connects, the comparison module is connected with the two-way counting module, the two-way counting module and the analog-to-digital conversion module phase
Connection；
On the one hand the voltage signal of the operational amplifying module output carries out charge or discharge to the compensating electric capacity, another
Aspect exports count signal after the comparison module, so that the two-way counting module is according to the count signal default
Counting action is carried out in time, the digital signal generated after counting is converted to analog signal by the analog-to-digital conversion module and goes forward side by side
Row output；The restoration module is in default working region for controlling the compensating electric capacity.
In conclusion being exported the present invention provides a kind of amplifier compensation circuit of built-in capacitance by operational amplifying module
Voltage signal on the one hand to compensating electric capacity carry out charge or discharge, count signal is on the other hand exported after comparison module,
So that two-way counting module carries out counting action according to the count signal within a preset time, the digital signal generated after counting is logical
It crosses analog-to-digital conversion module to be converted to analog signal and exported, it is ensured that the variable quantity of the analog signal of output is preset value, i.e.,
Be at the same time in compensating electric capacity from zero load to fully charged or from fully charged to zero load, it is only necessary to using compared with low capacity
Compensating electric capacity can be realized；The compensating electric capacity can be designed in integrated circuit simultaneously, promoted reliability and reduced cost, therefore
Solving existing amplifier compensation circuit, there is compensating electric capacities to be integrated on chip, can be only put on the external circuit board,
The problem of causing occupied space big and increased costs.
Detailed description of the invention
Fig. 1 is the schematic diagram of amplifier compensation circuit conventional in the prior art.
Fig. 2 is the equivalent circuit diagram of above-mentioned Fig. 1.
Fig. 3 is a kind of modular structure schematic diagram of the amplifier compensation circuit of built-in capacitance provided in an embodiment of the present invention.
Fig. 4 is a kind of exemplary circuit figure of the amplifier compensation circuit of built-in capacitance provided in an embodiment of the present invention.
Specific embodiment
In order to which technical problems, technical solutions and advantageous effects to be solved by the present invention are more clearly understood, below in conjunction with
Accompanying drawings and embodiments, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only used
To explain the present invention, it is not intended to limit the present invention.
A kind of amplifier compensation circuit of built-in capacitance provided in an embodiment of the present invention, the electricity exported by operational amplifying module
It presses signal on the one hand to carry out charge or discharge to compensating electric capacity, count signal is on the other hand exported after comparison module, so that
Two-way counting module carries out counting action according to the count signal within a preset time, and the digital signal generated after counting passes through mould
Number conversion modules be converted to analog signal and exported, it is ensured that the variable quantity of the analog signal of output be preset value, be
To compensating electric capacity from zero load to fully charged or from fully charged to zero load in the identical time, it is only necessary to using the benefit compared with low capacity
Repaying capacitor can be realized；The compensating electric capacity can be designed in integrated circuit simultaneously, promoted reliability and reduced cost.
In order to illustrate technical solutions according to the invention, the following is a description of specific embodiments.
Fig. 3 shows a kind of modular structure of the amplifier compensation circuit of built-in capacitance provided in an embodiment of the present invention, in order to
Convenient for explanation, only parts related to embodiments of the present invention are shown, and details are as follows:
A kind of amplifier compensation circuit of above-mentioned built-in capacitance, including operational amplifying module 101, comparison module 104, two-way meter
Digital-to-analogue block 105, analog-to-digital conversion module 106, restoration module 106 and compensating electric capacity 102.
The operational amplifying module 101 respectively with the compensating electric capacity 102, the comparison module 104 and the recovery
Module 106 is connected, and the comparison module 104 is connected with the two-way counting module 105, the two-way counting module 105
It is connected with the analog-to-digital conversion module 106.
On the one hand the voltage signal that the operational amplifying module 101 exports is charged or is put to the compensating electric capacity 102
On the other hand electricity exports count signal after the comparison module 104, so that the two-way counting module 105 is according to described
Count signal carries out counting action within a preset time, and the digital signal generated after counting passes through the analog-to-digital conversion module 106
It is converted to analog signal and is exported；The restoration module 103 is in default workspace for controlling the compensating electric capacity 102
Domain.
As an embodiment of the present invention, in above-mentioned amplifier compensation circuit, it is ensured that the variable quantity of the analog signal of output is
Preset value is at the same time to compensating electric capacity 102 from zero load to fully charged or from fully charged to zero load, it is only necessary to adopt
It can be realized with the compensating electric capacity 102 compared with low capacity；The compensating electric capacity 102 can be designed in integrated circuit simultaneously, be promoted reliable
Property and reduce cost.
As an embodiment of the present invention, when compensating electric capacity 102 exceeds effective operation interval, the complete of counting is being produced
After whole clock, need that the capacitance of compensating electric capacity 102 is retracted default working region by restoration module 103, so that the amplifier
Compensation circuit operates normally.
Fig. 4 shows a kind of exemplary circuit of the amplifier compensation circuit of built-in capacitance provided in an embodiment of the present invention, in order to
Convenient for explanation, only parts related to embodiments of the present invention are shown, and details are as follows:
As an embodiment of the present invention, above-mentioned operational amplifying module 101 includes operational amplifier U1A.
As an embodiment of the present invention, above-mentioned comparison module 104 includes first comparator Com1 and the second comparator Com2,
The inverting input terminal of the first comparator Com1 accesses the first reference voltage VH, the first comparator Com1's
Normal phase input end connects the output end of the operational amplifier U1A, the normal phase input end access second of the second comparator Com2
The anti-phase input of reference voltage VL, the second comparator Com2 terminate the output end of the operational amplifier U1A, and described first
The output of the output end of comparator Com1 and the second comparator Com2 terminate the two-way counting module 105.
As an embodiment of the present invention, above-mentioned two-way counting module 105 include multiple counters, multiple counters according to
Sequence is arranged and is connected in series with each other.
Specifically, the present embodiment is realized using eight bidirectional counters, including the first counter Q1, the second counter Q2,
Third counter Q3, four-counter Q4, the 5th counter Q5, the 6th counter Q6, the 7th counter Q7 and the 8th count
Device Q8, the first counter Q1, the second counter Q2, third counter Q3, four-counter Q4, the 5th counter Q5, the 6th meter
It counts device Q6, the 7th counter Q7 and the 8th counter Q8 sequential and is connected in series with each other.
As an embodiment of the present invention, above-mentioned analog-to-digital conversion module 106 includes analog-digital converter.In the present embodiment, should
Analog-digital converter is realized using 4 analog-digital converters.
As an embodiment of the present invention, above-mentioned restoration module 103 includes or door Or1 and switch Sw1；
Described or door Or1 first input end connects the output end of the first comparator Com1, described or door Or1 second
Input terminates the output end of the second comparator Com2, described or door Or1 output end control the switch Sw1 opening or
It closes, the output end of the first termination operational amplifier U1A of the switch Sw1, the second end ground connection of the switch Sw1.
Below in conjunction with Fig. 3 and Fig. 4 to a kind of above-mentioned working principle of the amplifier compensation circuit of built-in capacitance be illustrated as
Under:
Assuming that Isource=2uA, compensating electric capacity=20pf；As feedback voltage Vfb<reference voltage Vref, Isource>
Ifb, net current charge to the compensating electric capacity of 20pf, then Vo1 rises, and when Vo1 rises to 4V, first comparator Com1 is turned over
Turn, Voh=1, then counter carries out "+1 " movement, and forces to draw by Vo1 by reset pulse and arrive 2.5V；If Vfb still <base
Quasi- voltage Vref then continues to repeat the above movement；Assuming that Vfb=0, then net charging current 2uA, charging time 15us, in addition
1us resetting time, period 16us, that is, every 16us, counter will+1；When above situation repeats 32 times, the 5th meter
Number device Q5 overturning, the input "+1 " of DAC, then Vout rises a step-length (such as 1mv), it is, every 32*16=
512us, Vout rise 1mv；
When the compensating electric capacity of the conventional external 1uF of amplifier, when the same 2uA of net charging current, rise the time that 1mv needs
Are as follows: t=1uf*1mv/2uA=0.5ms=500us, the two time is of substantially equal, that is to say the present embodiment only with the benefit of 20pF
Time constant identical with the routine compensating electric capacity of 1uf can be obtained by repaying capacitor.
, whereas if Vfb > Vref, then net current discharges to 20pf capacitor, voltage Vo1 decline, when Vo1 drops to 1V,
Following comparator overturning, Vol=1, then counter will do it " -1 " movement, and forces to draw by Vo1 by reset pulse and arrive
2.5V；If Vfb still > reference voltage Vref, continue to repeat the above movement；Assuming that Vfb is twice of Vref, then putting only
Electric current 2uA, then discharge time 15us, period 16us；Namely every 16us, counter will " -1 "；When above situation repeats
At 32 times, the 5th counter Q5 overturning, the input " -1 " of DAC, then Vout declines a step-length (such as 1mv), that is,
32*16=512us, Vout decline 1mv；It is identical as the fall time of the compensating electric capacity of conventional 1uF.
When system work tends towards stability, feedback voltage Vfb can carry out the wave of amplitude very little near reference voltage Vref
Dynamic, net charging and discharging currents can be very small, and average value tends to 0 in its long-time, will appear two kinds of possible situations this when:
(1) charging is not charged to 4V also and begins to decline, but drops yet and fluctuate among 1v -4v less than 1V, that is, Vo1,
Counter is without any movement, and Vout stable is in some voltage；
(2) several periods are charged to 4V, and then several periods are put into 1V, that is, counter is constantly alternately "+1 "
" -1 " movement, cancels out each other, and adds up 32 all discontented, and DAC input signal is constant, and Vout is still stable with some voltage.
Certainly, by increasing the number of bidirectional counter and the digit of DAC, it can get higher magnification ratio, higher
Vout precision (smaller step-length) and Vout range.
In conclusion passing through operation amplifier mould the embodiment of the invention provides a kind of amplifier compensation circuit of built-in capacitance
On the one hand the voltage signal of block output carries out charge or discharge to compensating electric capacity, on the other hand export and count after comparison module
Signal, so that two-way counting module carries out counting action, the number generated after counting according to the count signal within a preset time
Signal is converted to analog signal by analog-to-digital conversion module and is exported, it is ensured that the variable quantity of the analog signal of output is default
Value, be at the same time in compensating electric capacity from zero load to fully charged or from fully charged to zero load, it is only necessary to using compared with
The compensating electric capacity of low capacity can be realized；Simultaneously the compensating electric capacity can be designed in integrated circuit, promoted reliability and reduce at
This, therefore solve existing amplifier compensation circuit there is compensating electric capacities to be integrated on chip, it can be only put at external electrical
On the plate of road, the problem of causing occupied space big and increased costs.
Those of ordinary skill in the art will appreciate that: the step of realizing above method embodiment or part steps can pass through
The relevant hardware of program instruction is completed, and program above-mentioned can store in computer-readable storage medium, which exists
When execution, step including the steps of the foregoing method embodiments is executed, and storage medium above-mentioned includes: ROM, RAM, magnetic or disk
Etc. the various media that can store program code.
Embodiment described above is merely illustrative of the technical solution of the present invention, rather than its limitations；Although referring to aforementioned reality
Applying example, invention is explained in detail, those skilled in the art should understand that: it still can be to aforementioned each
Technical solution documented by embodiment is modified or equivalent replacement of some of the technical features；And these are modified
Or replacement, the spirit and model of each embodiment technical solution of the embodiment of the present invention that it does not separate the essence of the corresponding technical solution
It encloses.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (6)
1. a kind of amplifier compensation circuit of built-in capacitance, which is characterized in that the amplifier compensation circuit includes:
Operational amplifying module, comparison module, two-way counting module, analog-to-digital conversion module, restoration module and compensating electric capacity；
The operational amplifying module is connected with the compensating electric capacity, the comparison module and the restoration module respectively, institute
It states comparison module to be connected with the two-way counting module, the two-way counting module is connected with the analog-to-digital conversion module；
On the one hand the voltage signal of the operational amplifying module output carries out charge or discharge to the compensating electric capacity, on the other hand
Count signal is exported after the comparison module, so that the two-way counting module is according to the count signal in preset time
Interior carry out counting action, the digital signal generated after counting are converted to analog signal by the analog-to-digital conversion module and carry out defeated
Out；The restoration module is in default working region for controlling the compensating electric capacity.
2. amplifier compensation circuit as described in claim 1, which is characterized in that the operational amplifying module includes operation amplifier
Device.
3. amplifier compensation circuit as claimed in claim 2, which is characterized in that the comparison module includes first comparator and
Two comparators,
The inverting input terminal of the first comparator accesses the first reference voltage, and the normal phase input end of the first comparator meets institute
The output end of operational amplifier is stated, the normal phase input end of second comparator accesses the second reference voltage, and described second compares
The anti-phase input of device terminates the output end of the operational amplifier, the output end of the first comparator and second comparator
Output terminate the two-way counting module.
4. amplifier compensation circuit as described in claim 1, which is characterized in that the two-way counting module includes multiple countings
Device,
It multiple counter sequentials and is connected in series with each other.
5. amplifier compensation circuit as described in claim 1, which is characterized in that the analog-to-digital conversion module includes analog-to-digital conversion
Device.
6. amplifier compensation circuit as claimed in claim 3, which is characterized in that the restoration module includes:
Or door and switch；
Described or door first input end connects the output end of the first comparator, described or door the second input termination described the
The output end of two comparators, described or door output end control opening or closing for the switch, the first termination of the switch
The output end of the operational amplifier, the second end ground connection of the switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811187141.3A CN109217826A (en) | 2018-10-12 | 2018-10-12 | A kind of amplifier compensation circuit of built-in capacitance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811187141.3A CN109217826A (en) | 2018-10-12 | 2018-10-12 | A kind of amplifier compensation circuit of built-in capacitance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109217826A true CN109217826A (en) | 2019-01-15 |
Family
ID=64979431
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811187141.3A Pending CN109217826A (en) | 2018-10-12 | 2018-10-12 | A kind of amplifier compensation circuit of built-in capacitance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109217826A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060145681A1 (en) * | 2004-12-14 | 2006-07-06 | Stmicroelectronics S.A. | Auto-adjustment of RC cells within a circuit |
| CN202121505U (en) * | 2011-05-27 | 2012-01-18 | 武汉大学 | Frequency compensation device for convertor in DC-DC current mode |
| US20140176102A1 (en) * | 2012-11-08 | 2014-06-26 | Richtek Technology Corporation | Mixed mode compensation circuit |
| CN104503526A (en) * | 2014-11-19 | 2015-04-08 | 矽力杰半导体技术(杭州)有限公司 | Feedback compensation circuit and method based on mixed signals |
| CN105356730A (en) * | 2015-12-10 | 2016-02-24 | 杭州士兰微电子股份有限公司 | Error amplification device and driving circuit comprising same |
| CN107153138A (en) * | 2017-06-23 | 2017-09-12 | 杭州士兰微电子股份有限公司 | Duty detection circuit and dutycycle detection method |
-
2018
- 2018-10-12 CN CN201811187141.3A patent/CN109217826A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060145681A1 (en) * | 2004-12-14 | 2006-07-06 | Stmicroelectronics S.A. | Auto-adjustment of RC cells within a circuit |
| CN202121505U (en) * | 2011-05-27 | 2012-01-18 | 武汉大学 | Frequency compensation device for convertor in DC-DC current mode |
| US20140176102A1 (en) * | 2012-11-08 | 2014-06-26 | Richtek Technology Corporation | Mixed mode compensation circuit |
| CN104503526A (en) * | 2014-11-19 | 2015-04-08 | 矽力杰半导体技术(杭州)有限公司 | Feedback compensation circuit and method based on mixed signals |
| CN105356730A (en) * | 2015-12-10 | 2016-02-24 | 杭州士兰微电子股份有限公司 | Error amplification device and driving circuit comprising same |
| CN107153138A (en) * | 2017-06-23 | 2017-09-12 | 杭州士兰微电子股份有限公司 | Duty detection circuit and dutycycle detection method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9634558B2 (en) | Negative charge pump feedback circuit | |
| US9893623B2 (en) | Windowless H-bridge buck-boost switching converter | |
| US20160226264A1 (en) | Digital controlled battery charging system | |
| CN104079196A (en) | Voltage balancing system and method for multilevel converters | |
| CN108712059A (en) | By the full-time inductive current monitoring method for sensing low-end switch | |
| CN104467095A (en) | Constant-current and constant-voltage charger chip based on ACOT framework | |
| CN106533154A (en) | Load transient and jitter of improved dc-dc converter | |
| CN102403900A (en) | Conversion controller | |
| CN102957430A (en) | Modulus switching circuit | |
| US5099195A (en) | Electronic device for measuring electrical power supply to a load | |
| CN107026566A (en) | Ripple modulation determines ON time power supply unit and its control circuit and control method | |
| CN112485697A (en) | High-voltage power supply ripple measurement and analysis system based on phase-locked amplification algorithm | |
| CN103326560A (en) | Integrated switch-capacitor DC-DC converter and method thereof | |
| EP3739761A1 (en) | Analog-to-digital converter and related chip | |
| CN109217826A (en) | A kind of amplifier compensation circuit of built-in capacitance | |
| JP2022096642A (en) | Inductive sensing method, device, and system | |
| CN101135720B (en) | System for detecting battery electric quantity and mobile phone thereof | |
| US8941366B2 (en) | DC-DC converter having an output that is a measure of the efficiency of the converter | |
| CN218958903U (en) | Analog-to-digital converter | |
| CN109932569B (en) | Signal duty cycle detection circuit and signal duty cycle detection method | |
| CN202004638U (en) | Frequency jittering circuit for switching power supply | |
| CN202652068U (en) | Multiphase DC-DC converter and relevant control device | |
| CN201830219U (en) | High-performance sawtooth wave generating circuit adopting digital circuit control | |
| EP3273231A1 (en) | Arrangement for measuring capacitance | |
| US6157672A (en) | Pulse modulation operation circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190115 |