CN110311560A - A kind of the error amplification control circuit and method of Switching Power Supply constant pressure and flow output circuit - Google Patents
A kind of the error amplification control circuit and method of Switching Power Supply constant pressure and flow output circuit Download PDFInfo
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- CN110311560A CN110311560A CN201910505102.1A CN201910505102A CN110311560A CN 110311560 A CN110311560 A CN 110311560A CN 201910505102 A CN201910505102 A CN 201910505102A CN 110311560 A CN110311560 A CN 110311560A
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- output
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- constant pressure
- power supply
- error
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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
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1584—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of error amplification control circuits of Switching Power Supply constant pressure and flow output circuit, the error amplification control circuit includes: a constant pressure and flow switch unit, for switching over input to output voltage feedback signal FB and output current sampling signal VCS；One error amplifier block, for carrying out error amplification to output voltage feedback signal FB or output current sampling signal VCS；One reference voltage generates unit, for generating error amplifier reference voltage；One error amplifier compensation network unit, for compensating output to error amplifier block output signal.The present invention has simplified control circuit and has reduced the area of control chip, improves chip integration；Greatly reduce the cost of control chip.
Description
Technical field
The present invention relates to error amplification control circuit and method more particularly to a kind of Switching Power Supply constant pressure and flow output circuits
Error amplification control circuit and method.
Background technique
With Switching Power Supply in electronic equipment using more and more extensive, the performance of powered-down power-switching circuit split at this stage
It is required that also higher and higher.Wherein, it is one of the index that must satisfy that Switching Power Supply conversion circuit, which has constant pressure and flow output function,.
Currently, Switching Power Supply constant pressure and flow output function generallys use error amplification control circuit to realize.
Fig. 1 is the error amplification control circuit of traditional Switching Power Supply constant pressure and flow output circuit, is generally included: constant pressure is missed
Poor amplifier unit U1, constant-current error amplifier unit U2, constant voltage reference voltage cell U3, constant current reference voltage unit U4 are permanent
Hold up poor amplifier offset network resistor R1, constant pressure error amplifier compensation network capacitor C1, constant-current error amplifier offset net
Network resistance R2, constant-current error amplifier offset network capacitance C2, level conversion unit PMOS transistor P1, level conversion unit
Resistance R3, level conversion unit PMOS transistor P2, level conversion unit resistance R4, level conversion unit NMOS transistor pipe
N1, current source I1, current source I2 and current source I3.
In Switching Power Supply constant pressure working stage, output voltage feedback signal FB is under constant pressure error amplifier block U1 effect
So that FB=REFV；Output current sampling signal VCS is always less than the reference voltage REFC of constant current reference voltage unit U4 at this time,
The output voltage COMPC of constant-current error amplifier unit U2 is supply voltage.So, the output of constant pressure error amplifier block U1
Voltage COMPV is turned by the level twice of level conversion unit PMOS transistor P1 and level conversion unit NMOS transistor N1
It changes, final output error amplification control signal COMP.
In the Switching Power Supply constant current operation stage, exports current sampling signal VCS and acted in constant-current error amplifier unit U2
Down so that VCS=REFC；Output voltage feedback signal FB is always less than the reference voltage of constant voltage reference voltage cell U3 at this time
The output voltage COMPV of REFV, constant pressure error amplifier block U1 are supply voltage.So, constant-current error amplifier unit U2
Output voltage COMPC by level conversion unit PMOS transistor P2 and level conversion unit NMOS transistor N1 twice
Level conversion, final output error amplification control signal COMP.Therefore, the mistake of traditional Switching Power Supply constant pressure and flow output circuit
Poor amplification control circuit in two stages of constant pressure and constant current respectively by two grouping error amplification control circuits come work, then passes through electricity
Flat turn, which is changed and combined, is converted into an output voltage two groups of error amplification control circuit out-put supply COMPC and COMPV
COMP。
The error amplification control circuit of traditional Switching Power Supply constant pressure and flow output circuit uses two groups of independent errors
Amplification control circuit.This control circuit have the disadvantage in that due to use two groups of independent error amplification control circuits, that
It is also required to two groups of independent error amplifier offset network R1, C1 and R2, C2.In system integration higher and higher today, accidentally
Poor amplifier offset network R1, C1 and R2, C2 need to be integrated in control chip interior, then two independent error amplifiers are mended
Repay network R1, C1 and R2, C2 can occupy the chip area of significant proportion.This affects the integrated level of control chip to improve
The cost of chip.Pursuing high integration and low cost aspect, this traditional two groups of independent error amplifier offsets of use
The error amplification control circuit of network has apparent limitation.Therefore, a kind of Switching Power Supply constant pressure and flow output circuit is researched and developed
Error amplification control circuit and method, become those skilled in the art's urgent problem to be solved.
Summary of the invention
The present invention is to provide a kind of error amplification of Switching Power Supply constant pressure and flow output circuit to solve above-mentioned deficiency
Control circuit and method.
Above-mentioned purpose of the invention is realized by technical solution below: a kind of Switching Power Supply constant pressure and flow output circuit
Error amplification control circuit, the error amplification control circuit includes:
One constant pressure and flow switch unit, for being carried out to output voltage feedback signal FB and output current sampling signal VCS
Switching input；
One error amplifier block, for being carried out to output voltage feedback signal FB or output current sampling signal VCS
Error amplification；
One reference voltage generates unit, for generating error amplifier reference voltage；
One error amplifier compensation network unit, for compensating output to error amplifier block output signal.
Further, the present invention discloses a kind of Switching Power Supply constant pressure and flow output circuit, the Switching Power Supply is permanent
Pressure constant current output circuit includes: an error amplification control unit, an output current sampling unit, power tube current sampling list
Member, a comparator unit, an oscillator unit, a logical drive unit, a high side power pipe, a low side power tube, an input
Filter capacitor, an inductance, an output current sampling resistor, an output voltage feedback resistive network and an output capacitance.
Further, first input terminal of the constant pressure and flow switch unit connects the output voltage feedback resistive network
Output end；Second input terminal of the constant pressure and flow switch unit connects the output end of the output current sampling unit；The mistake
The negative input end of poor amplifier unit connects the output end of the constant pressure and flow switch unit；The positive input of the error amplifier block
End connects the output end that the reference voltage generates unit, and the output end of the error amplifier block connects error amplifier compensation
The input terminal of network unit, while also connecting the positive input terminal of the comparator unit.
Further, which includes: operational amplifier Unit 1, and an operational amplifier 2 is single
Member, a NMOS transistor, first resistor and second resistance.The positive input terminal of operational amplifier Unit 1 connects the output voltage
The output end of feedback resistive network；The negative input end of operational amplifier Unit 1 connects the source electrode of the NMOS transistor, output
End connects the grid of the NMOS transistor；The positive input terminal of operational amplifier Unit 2 connects the output current sampling unit
Output end, the negative input end of operational amplifier Unit 2 connect the source electrode of the NMOS transistor, and output end connects NMOS crystalline substance
The grid of body pipe；One end of the first resistor connects VDD power supply, and the other end connects the drain electrode of the NMOS transistor；This second
One end of resistance connects ground, and the other end connects the source electrode of the NMOS transistor；The source electrode of the NMOS transistor connects the error
The negative input end of amplifier.
The present invention discloses a kind of error amplification control methods for Switching Power Supply constant pressure and flow output circuit.It will
The output voltage feedback signal FB and output current sampling signal VCS of the Switching Power Supply constant pressure and flow output circuit carry out constant pressure and constant
Stream switching, is output to the reference voltage of error amplifier block Yu the error amplifier in constant-voltage phase and constant-current phase respectively
REF carries out error amplification, using the output voltage COMP of resulting error amplifier as the threshold voltage of the comparator.It is closing
In ring control process, which can automatically adjust the threshold value of the comparator by closed loop feedback
Voltage COMP, so that the peak point current of the inductance is automatically had adjusted, so that the positive-negative input end electricity of the error amplifier block
Press it is equal, thus realize Switching Power Supply constant pressure and flow output function.
Amplify compared with control technology with the error for being traditionally used for Switching Power Supply constant pressure and flow output circuit, it is of the invention
For the error amplification control circuit of Switching Power Supply constant pressure and flow output, by constant pressure and flow switch unit, so that constant pressure and perseverance
The stream stage shares an error amplification control circuit, to only need a grouping error amplifier offset network.This is simplified significantly
Control circuit and the area for reducing control chip, improve chip integration；Therefore it has been greatly reduced control chip
Cost.High-performance and low cost aspect are being pursued, control chip applied by the present invention has bigger competitive advantage.
Detailed description of the invention
Fig. 1 is the error amplification control circuit of traditional Switching Power Supply constant pressure and flow output circuit；
Fig. 2 is the error amplification control circuit of Switching Power Supply constant pressure and flow output circuit of the invention；
Fig. 3 is the embodiment using the Switching Power Supply constant pressure and flow output circuit of error amplification control circuit of the invention；
Fig. 4 is a specific embodiment of constant pressure and flow switch unit of the invention；
Fig. 5 is the key node waveform of a specific embodiment of constant pressure and flow switch unit of the invention.
Specific embodiment
Specific embodiments of the present invention are described in further detail with reference to the accompanying drawing.
The present invention solves the error amplification control circuit needs for being traditionally used for Switching Power Supply constant pressure and flow output circuit
The problems such as two groups of independent error amplification control circuits, error amplifier compensation network occupies the chip area of significant proportion.It is logical
Constant pressure and flow switch unit is crossed, so that constant pressure and constant-current phase share an error amplifier circuit, therefore only needs one group of mistake
Poor amplifier offset network.To simplify control circuit and reduce the area of control chip, control integrated chip is improved
Degree also reduces the cost of control chip.
Embodiment:
As shown in Fig. 2, being the error amplification control circuit of Switching Power Supply constant pressure and flow output circuit of the invention.The mistake
Poor amplification control circuit includes:
One constant pressure and flow switch unit, for being carried out to output voltage feedback signal FB and output current sampling signal VCS
Switching input；
One error amplifier block, for being carried out to output voltage feedback signal FB or output current sampling signal VCS
Error amplification；
One reference voltage generates unit, for generating error amplifier reference voltage；
One error amplifier compensation network unit, for compensating output to error amplifier block output signal.
As shown in figure 3, for using the Switching Power Supply constant pressure and flow output circuit of error amplification control circuit of the invention
Embodiment.The Switching Power Supply constant pressure and flow output circuit includes: error amplification control unit 300, exports current sampling unit
301, power tube current sampling unit 302, comparator unit 303, oscillator list 304, logical drive unit 305, high side power
Pipe 306, low side power tube 307, input filter capacitor 308, inductance 309 export current sampling resistor 310, output voltage feedback
Resistor network 311 and output capacitance 312.The error amplification control unit for Switching Power Supply constant pressure and flow output circuit
It include: constant pressure and flow switch unit 200, error amplifier block 201, reference voltage generation unit 202, error amplifier compensation
Network unit 203.
In constant pressure working stage, the output voltage FB of the output voltage feedback resistive network 311 is than the output electric current
The output voltage VCS of sampling unit 301 is big, then the output voltage FB of the output voltage feedback resistive network 311 is transmitted to institute
The output FB_VCS for stating constant pressure and flow switch unit 200, there is FB_VCS=FB.At this point, the reference voltage generates unit 202
The output voltage FB of output voltage REF and the output voltage feedback resistive network 311 is separately input to the error amplifier
201 positive-negative input end carry out error amplification；And using the output voltage COMP of the error amplifier 201 as described in
The threshold voltage of comparator 303.In closed loop control process, the Switching Power Supply constant pressure and flow output circuit passes through closed loop feedback
The threshold voltage COMP of the comparator 303 can be automatically adjusted, to automatically have adjusted the peak value electricity of the inductance 309
Stream, so that the positive-negative input end voltage of the error amplifier block 201 is equal, to realize Switching Power Supply constant voltage output
Function.
In the constant current operation stage, the output voltage FB of the output voltage feedback resistive network 311 is than the output electric current
The output voltage VCS of sampling unit 301 is small, then the output voltage VCS of the output current sampling unit 301 is transmitted to the perseverance
The output FB_VCS for pressing constant current switch unit 200, there is FB_VCS=VCS.At this point, the reference voltage generates the defeated of unit 202
The output voltage VCS of voltage REF and the output current sampling unit 301 is separately input to the 201 of the error amplifier out
Positive-negative input end carry out error amplification；And using the output voltage COMP of the error amplifier 201 as the comparator
303 threshold voltage.In closed loop control process, the Switching Power Supply constant pressure and flow output circuit can be automatic by closed loop feedback
The adjusting comparator 303 threshold voltage COMP, to automatically have adjusted the peak point current of the inductance 309 so that
The positive-negative input end voltage of the error amplifier block 201 is equal, to realize the function of Switching Power Supply constant current output.
Fig. 4 is a specific embodiment of constant pressure and flow switch unit of the invention.The constant pressure and flow switch unit by
1 unit 400 of operational amplifier, 2 unit 401 of operational amplifier, NMOS transistor 402, first resistor 403 and second resistance 404
Composition.When the output voltage FB of the output voltage feedback resistive network 311 is than the output for exporting current sampling unit 301
When voltage VCS is big, 2 unit 401 of the operational amplifier work is in output off state, 1 unit 400 of operational amplifier
Work is in closed loop magnifying state.It can analyze to obtain according to the working characteristics of operational amplifier, the operational amplifier 1 is single at this time
The positive-negative input end voltage of member 400 is equal, then has FB=FB_VCS.When the output of the output voltage feedback resistive network 311
Output voltage VCS hours of voltage FB than the output current sampling unit 301,1 unit 400 of the operational amplifier work
In output off state, 2 unit 401 of the operational amplifier work is in closed loop magnifying state.According to the work of operational amplifier
Characteristic can analyze to obtain, and the positive-negative input end voltage of 2 unit 401 of operational amplifier is equal at this time, then has VCS=FB_
VCS.Therefore, available: as FB > VCS, to there is FB_VCS=FB；As FB < VCS, there is FB_VCS=VCS.To sum up, institute
Stating constant pressure and flow switch unit 200 realizes the handoff functionality of constant pressure and flow sampled voltage.
Fig. 5 is the key node waveform of a specific embodiment of constant pressure and flow switch unit of the invention.It can from figure
To see, gradually risen in the output voltage FB of startup stage, the output voltage feedback resistive network 311, than the output
The output voltage VCS of current sampling unit 301 is big, then the output voltage FB_VCS of the constant pressure and flow switch unit 200 is followed
The output voltage FB of the output voltage feedback resistive network 311, and continue to that constant-voltage phase terminates.It is described in constant-current phase
The output voltage VCS for exporting current sampling unit 301 is bigger than the output voltage FB of the output voltage feedback resistive network 311,
Then the output voltage FB_VCS of the constant pressure and flow switch unit 200 follows the output electricity of the output current sampling unit 301
VCS is pressed, and continues to that constant-current phase terminates.
It is only preferable specific embodiment of the invention described in this specification, for illustrating technical side of the invention
Case, rather than limitation of the present invention, the design of all those skilled in the art according to the present invention by logic analysis, reasoning or
Limited experiment is put to be made that technical solution obtained from some adjustment and change to the present invention, such as by error of the invention
The technical application of big control circuit is being boosted, in the Switching Power Supply of the topology such as buck.It is still main idea place of the invention, all answers
Within the scope of the present invention.
Claims (7)
1. a kind of error amplification control circuit of Switching Power Supply constant pressure and flow output circuit, it is characterised in that: the error amplification
Control circuit includes:
One constant pressure and flow switch unit, for being switched over to output voltage feedback signal FB and output current sampling signal VCS
Input；
One error amplifier block, for carrying out error to output voltage feedback signal FB or output current sampling signal VCS
Amplification；
One reference voltage generates unit, for generating error amplifier reference voltage；
One error amplifier compensation network unit, for compensating output to error amplifier block output signal.
2. a kind of error amplification control circuit of Switching Power Supply constant pressure and flow output circuit as described in claim 1, feature
Be: the Switching Power Supply constant pressure and flow output circuit includes: output current sampling unit, power tube current sampling unit, than
Compared with device unit, oscillator unit, logical drive unit, high side power pipe, low side power tube, input filter capacitor, inductance, output
Current sampling resistor, output voltage feedback resistive network and output capacitance.
3. a kind of error amplification control circuit of Switching Power Supply constant pressure and flow output circuit as described in claim 1, feature
Be: first input terminal of the constant pressure and flow switch unit connects the output end of the output voltage feedback resistive network；
Second input terminal of the constant pressure and flow switch unit connects the output end of the output current sampling unit；The error is put
The negative input end of big device unit connects the output end of the constant pressure and flow switch unit；The positive input of the error amplifier block
End connects the output end that the reference voltage generates unit, and the output end of the error amplifier block connects the error amplification
The input terminal of device compensation network unit, while also connecting the positive input terminal of the comparator unit.
4. a kind of error amplification control circuit of Switching Power Supply constant pressure and flow output circuit as described in claim 1, feature
Be: the constant pressure and flow switch unit includes: operational amplifier Unit 1, operational amplifier Unit 2, NMOS transistor, and first
Resistance and second resistance；The positive input terminal of operational amplifier Unit 1 connects the defeated of the output voltage feedback resistive network
Outlet；The negative input end of operational amplifier Unit 1 connects the source electrode of the NMOS transistor, described in output end connection
The grid of NMOS transistor；The positive input terminal of operational amplifier Unit 2 connects the output of the output current sampling unit
End, the negative input end of operational amplifier Unit 2 connect the source electrode of the NMOS transistor, and output end connects the NMOS
The grid of transistor；One end of the first resistor connects VDD power supply, and the other end connects the drain electrode of the NMOS transistor；
One end of the second resistance connects ground, and the other end connects the source electrode of the NMOS transistor；The source of the NMOS transistor
Pole connects the negative input end of the error amplifier.
5. a kind of error amplification control circuit of Switching Power Supply constant pressure and flow output circuit, it is characterised in that: the error amplification
Control circuit is applied in the switch power supply systems of a variety of topologys such as decompression, boosting, buck.
6. a kind of error amplification control method for Switching Power Supply constant pressure and flow output circuit, it is characterised in that: opened described
The output voltage feedback signal FB of the powered-down source constant pressure and flow output circuit and output current sampling signal VCS carries out constant pressure and constant
Stream switching, is output to the benchmark of the error amplifier block Yu the error amplifier in constant-voltage phase and constant-current phase respectively
Voltage REF carries out error amplification, using the output voltage COMP of the resulting error amplifier as the threshold value of the comparator
Voltage.In closed loop control process, the Switching Power Supply constant pressure and flow output circuit can automatically adjust institute by closed loop feedback
The threshold voltage COMP of comparator is stated, so that the peak point current of the inductance is automatically had adjusted, so that the error amplifier
The positive-negative input end voltage of unit is equal, to realize the function of Switching Power Supply constant pressure and flow output.
7. a kind of error amplification control method for Switching Power Supply constant pressure and flow output circuit according to claim 6,
It is characterized by: using such as Switching Power Supply constant pressure and flow output circuit described in any one of claim 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910505102.1A CN110311560A (en) | 2019-05-29 | 2019-05-29 | A kind of the error amplification control circuit and method of Switching Power Supply constant pressure and flow output circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910505102.1A CN110311560A (en) | 2019-05-29 | 2019-05-29 | A kind of the error amplification control circuit and method of Switching Power Supply constant pressure and flow output circuit |
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| Publication Number | Publication Date |
|---|---|
| CN110311560A true CN110311560A (en) | 2019-10-08 |
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ID=68077324
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910505102.1A Pending CN110311560A (en) | 2019-05-29 | 2019-05-29 | A kind of the error amplification control circuit and method of Switching Power Supply constant pressure and flow output circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110995253A (en) * | 2019-11-05 | 2020-04-10 | 芯创智（北京）微电子有限公司 | Time delay unit circuit and annular voltage-controlled oscillator |
| CN113726195A (en) * | 2021-08-27 | 2021-11-30 | 上海晶丰明源半导体股份有限公司 | Control circuit, control chip and power supply device |
-
2019
- 2019-05-29 CN CN201910505102.1A patent/CN110311560A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110995253A (en) * | 2019-11-05 | 2020-04-10 | 芯创智（北京）微电子有限公司 | Time delay unit circuit and annular voltage-controlled oscillator |
| CN113726195A (en) * | 2021-08-27 | 2021-11-30 | 上海晶丰明源半导体股份有限公司 | Control circuit, control chip and power supply device |
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