CN107346933A - Feedforward control circuit and power control system - Google Patents
Feedforward control circuit and power control system Download PDFInfo
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- CN107346933A CN107346933A CN201610297933.0A CN201610297933A CN107346933A CN 107346933 A CN107346933 A CN 107346933A CN 201610297933 A CN201610297933 A CN 201610297933A CN 107346933 A CN107346933 A CN 107346933A
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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
- H02M1/00—Details of apparatus for conversion
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0016—Control circuits providing compensation of output voltage deviations using feedforward of disturbance parameters
- H02M1/0019—Control circuits providing compensation of output voltage deviations using feedforward of disturbance parameters the disturbance parameters being load current fluctuations
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Abstract
The present invention, which provides a kind of feedforward control circuit and power control system, feedforward control circuit, to be included：Output filter capacitor current information acquisition module, is connected with a feedback circuit, suitable for obtaining the current information of output filter capacitor in feedback circuit；Laminating module, it is connected with output filter capacitor current information acquisition module, the current information of output filter capacitor suitable for output filter capacitor current information acquisition module is obtained is superimposed on the first feedback voltage of feedback circuit feedback, to form the output of the second feedback voltage.The feedforward control circuit of the present invention, the feedback signal of output filter capacitor current information can be obtained including again comprising output voltage information, the stable output voltage of power supply output is controlled after the feedback signal back is handled to the control module, is favorably improved the response speed of the power control system；Reduce the compensation requirement of the power control system so that the structure and design of the power control system are simpler.
Description
Technical field
The present invention relates to electronic circuit field, more particularly to a kind of feedforward control circuit and power control system.
Background technology
In power-supply system application, for the output voltage stablized, it is necessary to by output voltage feedback of the information to control module,
Control module is handled the output voltage information of feedback, the output voltage stablized by the adjustment of power tube；And export
The feedback of voltage is typically that output voltage is directly all fed back into control module or control is directly fed back to by divider resistance
Module, it is most directly also effective method that this, which is,.Existing power control system as shown in figure 1, including：It is power stage 11, anti-
Current feed circuit 12 and control module 13；The feedback circuit 12 includes 3rd resistor Rf1, the 4th resistance Rf2, load Rload
And output filter capacitor Cout, the 3rd resistor Rf1 connected with the 4th resistance Rf2 after with the load Rload and institute
State output filter capacitor Cout formation parallel-connection structures in parallel；The power stage is connected with a power supply, one end of the parallel-connection structure
It is connected with the power stage 11, other end ground connection；Described one end of control module 13 is connected to the 3rd resistor Rf1 and institute
Between stating the 4th resistance Rf2, the other end is connected with the power stage.Pass through the 3rd resistor Rf1 and the 4th resistance
Rf2, output voltage Vout a part of Vfb* is directly fed back into the control module 13 and handled, wherein Vfb* with it is defeated
The relational expression for going out voltage Vout is：
This is a kind of most direct effective method, and when output voltage Vout changes, Vfb* will pass through institute with changing
The regulation of control module 13 and the power stage 11 is stated, the output voltage of power supply can be caused to come back in setting value.
Generally, the electronic component such as electronic product inside chip can only work under steady dc voltage, so, in many cases
Need to change power supply, the outside supply voltage provided is transformed into the DC voltage of needs inside suitable electronic product.And
This process can be that switch control can also be Linear Control, and either which kind of control process, output all be unable to do without filtering
This energy-storage travelling wave tube (the output filter capacitor Cout i.e. shown in Fig. 1) of electric capacity, it is equivalent to an energy storage pool, while inhaling
Energy is received, while releasing energy, when the energy of absorption is equal to the energy of release, then output voltage just settles out, when defeated
Enter the energy that energy is more than release, this portion of energy is stored in electric capacity, then the voltage of electric capacity will raise, i.e. output electricity
Pressure rise, vice versa.So this characteristic of electric capacity is widely used in the filtering of dc source output.
However, in existing power control system shown in Fig. 1, the voltage of feedback contains only information of voltage, and have ignored and lead
Cause output voltage change output filter capacitor Cout on current information, this allow for whole system response it is slower, or need
Increasingly complex compensation network compensates to system.
Meanwhile the existing power control system shown in Fig. 1 is acceptable for most application, but change for load
It hurry up, for the application that amplitude of variation is big, then can not meet its requirement.Need at present using change control mode, improve switch frequency
The methods of rate, improves the response speed of system.
The content of the invention
It is existing for solving it is an object of the invention to provide a kind of power control system in view of the above the shortcomings that prior art
Whole system is responded relatively slow or needed more multiple caused by the voltage for having power control system feedback in technology only includes information of voltage
The problem of miscellaneous compensation network compensates to system.
In order to achieve the above objects and other related objects, the present invention provides a kind of feedforward control circuit, the feedforward control circuit bag
Include：
Output filter capacitor current information acquisition module, is connected with a feedback circuit, is exported suitable for obtaining in the feedback circuit
The current information of filter capacitor；
Laminating module, it is connected with the output filter capacitor current information acquisition module, suitable for the output filter capacitor is electric
The current information for the output filter capacitor that stream information acquisition module obtains is superimposed to the first feedback voltage of the feedback circuit feedback
On, to form the output of the second feedback voltage.
As a kind of preferred scheme of the feedforward control circuit of the present invention, the output filter capacitor current information acquisition module includes
Operational amplifier and the first electric capacity；
The operational amplifier includes normal phase input end, inverting input and output end；The normal phase input end of the operational amplifier
It is connected with the feedback circuit；
Described first electric capacity one end is connected with the inverting input of the operational amplifier, other end ground connection.
As a kind of preferred scheme of the feedforward control circuit of the present invention, the output filter capacitor current information acquisition module includes
Operational amplifier, the first electric capacity and first resistor；
The operational amplifier includes normal phase input end, inverting input and output end；The normal phase input end of the operational amplifier
It is connected with the feedback circuit；
First electric capacity connects to form cascaded structure with the first resistor, described cascaded structure one end and the operational amplifier
Inverting input be connected, the other end ground connection.
As a kind of preferred scheme of the feedforward control circuit of the present invention, the laminating module includes second resistance, second electricity
Resistance one end is connected with the inverting input of the operational amplifier, and the other end is connected with the output end of the operational amplifier.
The present invention also provides a kind of power control system, and the power control system includes：Power stage, feedback circuit, feedforward control
Circuit processed and control module；
The power stage includes first input end, the second input and output end, the first input end of the power stage and a power supply
It is connected；
The feedback circuit includes input, and the input of the feedback circuit is connected with the output end of the power stage, is suitable to
Produce the first feedback voltage；
The feedforward control circuit includes input and output end, the input of the feedforward control circuit and the feedback circuit phase
Connection, believe suitable for obtaining the current information of output filter capacitor in the feedback circuit, and by the electric current of the output filter capacitor
Breath, which is superimposed on first feedback voltage, forms the output of the second feedback voltage；
The control module includes input and output end, the output of the input of the control module and the feedforward control circuit
End is connected, and the output end of the control module is connected with the second input of the power stage, suitable for according to the feedforward control
Second feedback voltage of electronic feedback processed is simultaneously adjusted with reference to the power stage to the output voltage of the power supply.
As a kind of preferred scheme of the power control system of the present invention, the feedback circuit includes：3rd resistor, the 4th resistance,
Load and output filter capacitor；
The 3rd resistor forms parallel-connection structure, institute with parallel with the load and the filter capacitor after the 4th resistant series
The one end for stating parallel-connection structure is connected with the output end of the power stage, other end ground connection.
As a kind of preferred scheme of the power control system of the present invention, the feedforward control circuit includes：
Output filter capacitor current information acquisition module, the input of the output filter capacitor current information acquisition module are connected to
Between the 3rd resistor and the 4th resistance, suitable for obtaining the current information of the output filter capacitor；
Laminating module, it is connected with the output filter capacitor current information acquisition module, suitable for the output filter capacitor is electric
The current information for the output filter capacitor that stream information acquisition module obtains is superimposed to the first feedback voltage of the feedback circuit feedback
On, to form the output of the second feedback voltage.
As a kind of preferred scheme of the power control system of the present invention, the output filter capacitor current information acquisition module includes
Operational amplifier and the first electric capacity；
The operational amplifier includes normal phase input end, inverting input and output end；The normal phase input end of the operational amplifier
It is connected between the 3rd resistor and the 4th resistance；
Described first electric capacity one end is connected with the inverting input of the operational amplifier, other end ground connection.
As a kind of preferred scheme of the power control system of the present invention, the output filter capacitor current information acquisition module includes
Operational amplifier, the first electric capacity and first resistor；
The operational amplifier includes normal phase input end, inverting input and output end；The normal phase input end of the operational amplifier
It is connected between the 3rd resistor and the 4th resistance；
First electric capacity connects to form cascaded structure with the first resistor, described cascaded structure one end and the operational amplifier
Inverting input be connected, the other end ground connection.
As a kind of preferred scheme of the power control system of the present invention, the laminating module includes second resistance, second electricity
Resistance one end is connected with the inverting input of the operational amplifier, and the other end is connected with the output end of the operational amplifier.
As described above, the power control system of the present invention, has the advantages that：
The feedforward control circuit of the present invention, it can obtain including output filter capacitor current information again comprising output voltage information
Feedback signal, the stable output voltage of power supply output is controlled after the feedback signal back is handled to control module, is helped
In the response speed for improving power control system；Reduce the compensation requirement of power control system so that the structure of power control system
And design is simpler.
Brief description of the drawings
Fig. 1 is shown as the block schematic illustration of power control system of the prior art.
Fig. 2 is shown as the block schematic illustration of the feedforward control circuit provided in the embodiment of the present invention one.
Fig. 3 is shown as the block schematic illustration of the feedforward control circuit provided in the embodiment of the present invention two.
Fig. 4 is shown as the block schematic illustration of the power control system provided in the embodiment of the present invention three.
Fig. 5 is shown as the block schematic illustration of the power control system provided in the embodiment of the present invention four.
Component label instructions
11 power stages
12 feedback circuits
13 control modules
21 power stages
22 feedback circuits
23 feedforward control circuits
231 output filter capacitor current information acquisition modules
2311 operational amplifiers
232 laminating modules
24 control modules
R1 first resistors
R2 second resistances
The electric capacity of C1 first
Rf1 3rd resistors
The resistance of Rf2 the 4th
Rload is loaded
Cout output filter capacitors
The equivalent series resistance of Resr output filter capacitors
Embodiment
Illustrate embodiments of the present invention below by way of specific instantiation, those skilled in the art can be as disclosed by this specification
Content understand easily the present invention other advantages and effect.The present invention can also add by way of a different and different embodiment
To implement or apply, the various details in this specification can also be based on different viewpoints and application, in the essence without departing from the present invention
God is lower to carry out various modifications or alterations.
Refer to Fig. 2~Fig. 5.It should be noted that the diagram provided in the present embodiment only illustrates the present invention's in a schematic way
Basic conception, though in schema only display with relevant component in the present invention rather than according to component count during actual implement, shape and
Size is drawn, and kenel, quantity and the ratio of each component can be a kind of random change during its actual implementation, and its assembly layout type
State may also be increasingly complex.
Embodiment one
As shown in Fig. 2 the present invention provides a kind of feedforward control circuit 23, in the present embodiment, the feedforward control circuit 23 is suitable
Equivalent series resistance (ESR) for output filter capacitor is equal to zero or very small, negligible power control system.
The feedforward control circuit 23 includes：Output filter capacitor current information acquisition module 231, the output filter capacitor electric current letter
Breath acquisition module 231 is connected with a feedback circuit (not shown), suitable for obtaining output filter capacitor in the feedback circuit
Current information；Laminating module 232, the laminating module 232 and the phase of output filter capacitor current information acquisition module 231
Connection, suitable for the current information superposition for the output filter capacitor for obtaining the output filter capacitor current information acquisition module 231
To the first feedback voltage Vfb of feedback circuit feedback, exported with forming the second feedback voltage Vfb 1.
As an example, the output filter capacitor current information acquisition module 231 includes the electric capacity of operational amplifier 2311 and first
C1；The operational amplifier 2311 includes normal phase input end, inverting input and output end；The operational amplifier 2311
Normal phase input end is connected with the feedback circuit；Described first electric capacity C1 one end is anti-phase defeated with the operational amplifier 2311
Enter end to be connected, other end ground connection.
As an example, the laminating module 232 includes second resistance R2, described second resistance R2 one end and the operation amplifier
The inverting input of device 2311 is connected, and the other end is connected with the output end of the operational amplifier 2311.
The operation principle of feedforward control circuit described in the present embodiment is：According to the empty short empty disconnected original of the operational amplifier 2311
Reason, the normal phase input end of the operational amplifier 2311 and the voltage of inverting input are identical, and described two inputs do not have yet
There is electric current inflow.So can obtain, the voltage at the first electric capacity C1 both ends is be equal to feedback circuit feedback first
Feedback voltage Vfb, so that the electric current for the electric current i2 and the output filter capacitor for flowing through the first electric capacity C1 has one
Fixed relation, because two inputs of the operational amplifier 2311 do not have electric current to flow in or out, electric current is simply by the fortune
The output end of amplifier 2311 is calculated, flows through the second resistance R2, passes through the first electric capacity C1 to ground.Wherein, it is described
Second resistance R2 effect is that flowing through the first electric capacity C1 have certain relation with output filter capacitor electric current
Electric current i2 is converted on the voltage for the inverting input that voltage signal is superimposed to the operational amplifier 2311, and the computing is put
The voltage of the inverting input of big device 2311 is equal to the first feedback voltage Vfb of feedback circuit feedback, so, by described
Second resistance R2 can be obtained by include the first feedback voltage Vfb include again the output filter capacitor electric current it is second anti-
Feedthrough voltage Vfb1.
Embodiment two
As shown in figure 3, the present embodiment also provides a kind of feedforward control circuit 23, the feedforward control circuit 23 in the present embodiment
It is larger suitable for output filter capacitor Cout equivalent series resistance (ESR), it is not possible to the power control system ignored.This reality
The feedforward control circuit 23 applied in example is roughly the same with the structure of the feedforward control circuit 23 in embodiment one, the two
Difference be：In embodiment one, the output filter capacitor current information acquisition module 231 include operational amplifier 2311 and
First electric capacity C1, and in the present embodiment, the output filter capacitor current information acquisition module 231 include operational amplifier 2311,
First electric capacity C1 and first resistor R1；The first electric capacity C1 connects to form cascaded structure with the first resistor R1, described
Cascaded structure one end is connected with the inverting input of the operational amplifier 2311, other end ground connection.
As an example, the first electric capacity C1 ensures to connect with the first resistor R1；Can the first electric capacity C1
One end away from the first resistor R1 is connected with the inverting input of the operational amplifier 2311, the first resistor R1
One end away from the first electric capacity C1 is grounded；Can also the one end of the first resistor R1 away from the first electric capacity C1 with
The inverting input of the operational amplifier 2311 is connected, the one end of the first electric capacity C1 away from the first resistor R1
Ground connection.
The operation principle of feedforward control circuit described in the present embodiment is：According to the empty short empty disconnected original of the operational amplifier 2311
Reason, the normal phase input end of the operational amplifier 2311 and the voltage of inverting input are identical, and described two inputs do not have yet
There is electric current inflow.So it can obtain, the electricity at the cascaded structure both ends of the first electric capacity C1 and first resistor R1 compositions
Pressure is equal to the feedback voltage Vfb of the feedback circuit 22 feedback so that flow through the electric current i2 of the cascaded structure with it is described
The electric current of output filter capacitor has certain relation, due to two inputs of the operational amplifier 2311 do not have electric current flow into or
Outflow, electric current flow through the second resistance R2 simply by the output end of the operational amplifier 2311, pass through described the
The cascaded structure of one electric capacity C1 and first resistor R1 compositions is extremely.Wherein, the effect of the second resistance R2 be by with
The electric current of the output filter capacitor there is the electric current i2 of certain relation to be converted to voltage signal be superimposed to the operational amplifier 2311
Inverting input voltage on, and the voltage of the inverting input of the operational amplifier 2311 equal to the feedback circuit feed back
The first feedback voltage Vfb, so, can be obtained by by the second resistance R2 includes first feedback voltage Vfb
Second feedback voltage Vfb 1 of the electric current including the output filter capacitor again.
Embodiment three
As shown in figure 4, the present invention provides a kind of power control system, in the present embodiment, with the output filter capacitor Cout
Equivalent series resistance (ESR) think to be equal to zero, it is or very small, can be ignored as precondition.The power supply
Control system includes：Power stage 21, feedback circuit 22, the feedforward control circuit 23 as described in embodiment one and control module
24；Wherein,
The power stage 21 includes first input end, the second input and output end, the first input end of the power stage 21 with
One power supply (not shown) is connected；The input voltage vin in the left side of power stage 21 is the output voltage of the power supply；
The feedback circuit 22 includes input, and the input of the feedback circuit 22 is connected with the output end of the power stage 21
Connect, suitable for the first feedback voltage Vfb is fed back into the feedforward control circuit 23；
The feedforward control circuit 23 includes input and output end, input and the feedback of the feedforward control circuit 23
Circuit 22 is connected, suitable for obtaining the information of the electric current i1 of output filter capacitor in the feedback circuit 22, and by the filtering
The second feedback voltage Vfb 1, which is formed, in the electric current i1 of electric capacity information superposition to first feedback voltage Vfb feeds back to the control
Molding block 24；
The control module 24 includes input and output end, input and the feedforward control circuit of the control module 24
23 output end is connected, and the output end of the control module 24 is connected with the second input of the power stage 21, is suitable to
According to the feedforward control circuit 23 feedback the second feedback voltage Vfb 1 and with reference to output of the power stage 21 to the power supply
Voltage is adjusted.
As an example, the feedback circuit 22 includes：3rd resistor Rf1, the 4th resistance Rf2, load Rload and output filter
Ripple electric capacity Cout；The 3rd resistor Rf1 connected with the 4th resistance Rf2 after with the load Rload and the filtered electrical
Hold Cout formation parallel-connection structures in parallel, one end of the parallel-connection structure is connected with the power stage 21, other end ground connection.
As an example, the feedforward control circuit 23 includes：Output filter capacitor current information acquisition module 231, the output
The input of filter capacitor current information acquisition module 231 is connected between the 3rd resistor Rf1 and the 4th resistance Rf2,
Suitable for obtaining the information of output filter capacitor Cout electric current i1 in the feedback circuit 22；Laminating module 232, the superposition
Module 232 is connected with the output filter capacitor current information acquisition module 231, suitable for by the output filter capacitor electric current
Feed back on the electric current i1 for the output filter capacitor Cout that data obtaining module 231 obtains information superposition to electric 22 tunnels of the feedback
In first feedback voltage Vfb, exported with forming the second feedback voltage Vfb 1.
As an example, the output filter capacitor current information acquisition module 231 includes the electric capacity of operational amplifier 2311 and first
C1；The operational amplifier 2311 includes normal phase input end, inverting input and output end；The operational amplifier 2311
Normal phase input end and it is connected between the 3rd resistor Rf1 and the 4th resistance Rf2；Described first electric capacity C1 one end with
The inverting input of the operational amplifier 2311 is connected, other end ground connection.
As an example, the laminating module 232 includes second resistance R2, described second resistance R2 one end and the operation amplifier
The inverting input of device 2311 is connected, and the other end is connected with the output end of the operational amplifier 2311.
The operation principle of power control system described in the present embodiment is：According to the empty short empty disconnected original of the operational amplifier 2311
Reason, the normal phase input end of the operational amplifier 2311 and the voltage of inverting input are identical, and described two inputs do not have yet
There is electric current inflow.So can obtain, the voltage at the first electric capacity C1 both ends is be equal to the feedback circuit 22 feedback the
One feedback voltage Vfb, so that flowing through the electric current i2 and the output filter capacitor Cout of the first electric capacity C1 electric current
I1 has certain relation, because two inputs of the operational amplifier 2311 do not have electric current to flow in or out, and the control
Equally also no electric current flows in or out molding block 24, so output end of the electric current simply by the operational amplifier 2311,
The second resistance R2 is flowed through, passes through the first electric capacity C1 to ground.Wherein, the effect of the second resistance R2 be by
The electric current i2 for having certain relation with the electric current i1 of the output filter capacitor Cout that the first electric capacity C1 flows through is converted to
Voltage signal is superimposed on the voltage of the inverting input of the operational amplifier 2311, and the operational amplifier 2311 is anti-
The voltage of phase input is equal to the first feedback voltage Vfb of the feedback circuit 22 feedback, so, pass through the second resistance
R2 can be obtained by the second feedback for including the electric current i1 that the first feedback voltage Vfb includes the output filter capacitor Cout again
Voltage Vfb1.
Specifically, the first feedback voltage Vfb and the defeated voltage of the feedback circuit 22 output that the feedback circuit 22 feeds back
Vout relation is represented by：
Wherein,
The electric current i2 for flowing through the first electric capacity C1 again can be represented respectively with flowing through the electric current i1 of the output filter capacitor Cout
For：
I2 expression formula can be converted to according to formula (1), formula (2) and formula (3)：
And then the relational expression that can obtain i1 and i2 is：
From formula (5), flow through the electric current i2 of the first electric capacity C1 and flow through the electricity of the output filter capacitor Cout
Stream i1 has linear ratio relation, will flow through the electric current i1 in the output filter capacitor Cout and has been sampled to and flows through described the
In one electric capacity C1 electric current i2.
Again because two inputs of the operational amplifier 2311 do not flow into electric current, and the operational amplifier 2311 is defeated
Go out end also will not flow into electric current to the control module 24, so, the electric current for flowing through the second resistance R2 is described equal to flowing through
First electric capacity C1 electric current, the second feedback voltage Vfb 1 that the feedforward control circuit 23 feeds back to the control module 24 can
It is expressed as：
So far, the feedforward control circuit 23 feeds back in the second feedback voltage Vfb 1 of the control module 24 and contains institute
The first feedback voltage Vfb of the feedback of feedback circuit 22 is stated, contains the electric current letter flowed through in the output filter capacitor Cout again
Breath
It should be noted that formula (1) is into formula (6), Rf1, Rf2 and R2 represent respectively the 3rd resistor Rf1,
The 4th resistance Rf2 and second resistance R2 resistance value, Cout and C1 represent the output filter capacitor Cout respectively
And the capacitance of the first electric capacity C1.
Example IV
Referring to Fig. 5, the present invention also provides a kind of power control system, in the present embodiment, with the output filter capacitor Cout
Equivalent series resistance (ESR) it is larger, it is not possible to ignore as precondition.Power control system described in the present embodiment
Roughly the same with the power control system described in embodiment one, difference of the present embodiment compared to embodiment three is：Embodiment
Feedforward control circuit 23 described in three is the feedforward control circuit 23 described in embodiment one, and described in the present embodiment before
It is the feedforward control circuit 23 described in embodiment two to present control circuit 23,；I.e. in embodiment three, the output filter capacitor electricity
Stream information acquisition module 231 includes the electric capacity C1 of operational amplifier 2311 and first, and in the present embodiment, the output filtered electrical
Capacitance current data obtaining module 231 includes operational amplifier 2311, the first electric capacity C1 and first resistor R1；First electric capacity
C1 connects to form cascaded structure with the first resistor R1, and described cascaded structure one end is anti-phase with the operational amplifier 2311
Input is connected, other end ground connection.
As an example, the first electric capacity C1 ensures to connect with the first resistor R1；Can the first electric capacity C1
One end away from the first resistor R1 is connected with the inverting input of the operational amplifier 2311, the first resistor R1
One end away from the first electric capacity C1 is grounded；Can also the one end of the first resistor R1 away from the first electric capacity C1 with
The inverting input of the operational amplifier 2311 is connected, the one end of the first electric capacity C1 away from the first resistor R1
Ground connection.
The operation principle of power control system described in the present embodiment is：According to the empty short empty disconnected original of the operational amplifier 2311
Reason, the normal phase input end of the operational amplifier 2311 and the voltage of inverting input are identical, and described two inputs do not have yet
There is electric current inflow.So it can obtain, the electricity at the cascaded structure both ends of the first electric capacity C1 and first resistor R1 compositions
Pressure is equal to the first feedback voltage Vfb of the feedback circuit 22 feedback, so that flowing through the output filter capacitor electric current letter
The electric current i1 for ceasing the electric current i2 and the output filter capacitor Cout of acquisition module 231 has certain relation, due to the fortune
Two inputs for calculating amplifier 2311 do not have electric current to flow in or out, and the control module 24 equally also flows into without electric current
Or outflow, so output end of the electric current simply by the operational amplifier 2311, flows through the second resistance R2, passes through
The cascaded structure of the first electric capacity C1 and first resistor R1 compositions is extremely.Wherein, the effect of the second resistance R2
Be by the electric current i2 with certain relation of the electric current i1 with the output filter capacitor Cout be converted to voltage signal be superimposed to it is described
On the voltage of the inverting input of operational amplifier 2311, and the voltage of the inverting input of the operational amplifier 2311 is equal to
The first feedback voltage Vfb that the feedback circuit 22 feeds back, so, can be obtained by by the second resistance R2 includes
First feedback voltage Vfb includes the electric current i1 of the output filter capacitor Cout the second feedback voltage Vfb 1 again.
Specifically, the first feedback voltage Vfb and the defeated voltage of the feedback circuit 22 output that the feedback circuit 22 feeds back
Vout relation is equally represented by the formula (1) in embodiment one, can be obtained by frequency domain according to formula (1)：
Arrangement can obtain：
From formula (8), as the equivalent series resistance Resr and the first resistor R1 of the output filter capacitor Cout
All it is zero or Resr × Cout=R1 × C1, then i2 expression formula is consistent with the structure obtained in embodiment one.As Resr × Cout
During ≠ R1 × C1, i2 and i1 can not keep linear completely, and both meetings have certain phase difference, and this phase difference is in not shadow
Acoustic system is acceptable in the case of working.
Equally, can be obtained by the electric current i2 for flowing through the output filter capacitor current information acquisition module 231：
Equally, the feedforward control circuit 23 obtained feeds back in the second feedback voltage Vfb 1 of the control module 24 and wrapped
The first feedback voltage Vfb that the feedback circuit 22 feeds back is contained, has contained and flowed through in the output filter capacitor Cout again
Current information
Further, by the output voltage Vout of the feedback circuit 22 frequency-domain expression：Substitute into formula (9) and can obtain frequency-domain function expression formulas of the Vfb1 on Vout：
From formula (10), add after the feedforward control circuit 23, actual feedback voltage signal Vfb1 is in tradition
Direct feedback signalOn the basis of add a zero pole point pair, and zero frequency is more leaned on compared to limit
Nearly origin, the size of the second resistance R2 is depended on close to degree.And the phase for causing Vfb1 is compared Vout by the introducing of zero point
Phase it is advanced, and the advanced of phase means smaller system delay and faster response speed.
It should be noted that formula (7) is into formula (10), R1, R2 and Resr represent respectively the first resistor R1,
The equivalent series impedance of second resistance R2 resistance value and the output filter capacitor Cout, Cout and C1 represent institute respectively
State output filter capacitor Cout and the first electric capacity C1 capacitance.
In summary, the present invention provides a kind of feedforward control circuit and power control system, the feedforward control circuit and included：It is defeated
Go out filter capacitor current information acquisition module, be connected with a feedback circuit, filtered electrical is exported suitable for obtaining in the feedback circuit
The current information of appearance；Laminating module, it is connected with the output filter capacitor current information acquisition module, suitable for by the output
The current information for the output filter capacitor that filter capacitor current information acquisition module obtains is superimposed to the first of the feedback circuit feedback
On feedback voltage, to form the output of the second feedback voltage.The feedforward control circuit of the present invention, can obtain including output voltage
Information includes the feedback signal of output filter capacitor current information again, at the feedback signal back to the control module
The stable output voltage of power supply output is controlled after reason, is favorably improved the response speed of the power control system；Reduce the electricity
The compensation requirement of source control system so that the structure and design of the power control system are simpler.
The above-described embodiments merely illustrate the principles and effects of the present invention, not for the limitation present invention.It is any to be familiar with this skill
The personage of art all can carry out modifications and changes under the spirit and scope without prejudice to the present invention to above-described embodiment.Therefore, such as
Those of ordinary skill in the art without departing from disclosed spirit with completed under technological thought all etc.
Modifications and changes are imitated, should be covered by the claim of the present invention.
Claims (10)
1. a kind of feedforward control circuit, it is characterised in that the feedforward control circuit includes：
Output filter capacitor current information acquisition module, is connected with a feedback circuit, defeated in the feedback circuit suitable for obtaining
Go out the current information of filter capacitor；
Laminating module, it is connected with the output filter capacitor current information acquisition module, suitable for by the output filtered electrical
It is first anti-to be superimposed to feedback circuit feedback for the current information for the output filter capacitor that capacitance current data obtaining module obtains
On feedthrough voltage, to form the output of the second feedback voltage.
2. feedforward control circuit according to claim 1, it is characterised in that：The output filter capacitor current information acquisition module
Including operational amplifier and the first electric capacity；
The operational amplifier includes normal phase input end, inverting input and output end；The positive of the operational amplifier is defeated
Enter end with the feedback circuit to be connected；
Described first electric capacity one end is connected with the inverting input of the operational amplifier, other end ground connection.
3. feedforward control circuit according to claim 1, it is characterised in that：The output filter capacitor current information acquisition module
Including operational amplifier, the first electric capacity and first resistor；
The operational amplifier includes normal phase input end, inverting input and output end；The positive of the operational amplifier is defeated
Enter end with the feedback circuit to be connected；
First electric capacity is connected to form cascaded structure with the first resistor, and described cascaded structure one end is put with the computing
The inverting input of big device is connected, other end ground connection.
4. the feedforward control circuit according to Claims 2 or 3, it is characterised in that：The laminating module includes second resistance, institute
The inverting input that second resistance one end is stated with the operational amplifier is connected, the output of the other end and the operational amplifier
End is connected.
5. a kind of power control system, it is characterised in that the power control system includes：Power stage, feedback circuit, feedforward control
Circuit and control module；
The power stage includes first input end, the second input and output end, the first input end of the power stage and one
Power supply is connected；
The feedback circuit includes input, and the input of the feedback circuit is connected with the output end of the power stage,
Suitable for producing the first feedback voltage；
The feedforward control circuit includes input and output end, the input of the feedforward control circuit and the feedback electricity
Road is connected, suitable for obtaining the current information of output filter capacitor in the feedback circuit, and by the output filter capacitor
Current information be superimposed on first feedback voltage formed the second feedback voltage output；
The control module includes input and output end, the input of the control module and the feedforward control circuit
Output end is connected, and the output end of the control module is connected with the second input of the power stage, suitable for according to institute
State the second feedback voltage of feedforward control circuit feedback and the output voltage of the power supply is adjusted with reference to the power stage
It is whole.
6. power control system according to claim 5, it is characterised in that：The feedback circuit includes：3rd resistor, the 4th
Resistance, load and output filter capacitor；
The 3rd resistor is formed and is coupled with the load and filter capacitor parallel connection with after the 4th resistant series
Structure, one end of the parallel-connection structure are connected with the output end of the power stage, other end ground connection.
7. power control system according to claim 6, it is characterised in that：The feedforward control circuit includes：
Output filter capacitor current information acquisition module, the input of the output filter capacitor current information acquisition module connect
It is connected between the 3rd resistor and the 4th resistance, suitable for obtaining the current information of the output filter capacitor；
Laminating module, it is connected with the output filter capacitor current information acquisition module, suitable for by the output filtered electrical
It is first anti-to be superimposed to feedback circuit feedback for the current information for the output filter capacitor that capacitance current data obtaining module obtains
On feedthrough voltage, to form the output of the second feedback voltage.
8. power control system according to claim 7, it is characterised in that：The output filter capacitor current information acquisition module
Including operational amplifier and the first electric capacity；
The operational amplifier includes normal phase input end, inverting input and output end；The positive of the operational amplifier is defeated
Enter end to be connected between the 3rd resistor and the 4th resistance；
Described first electric capacity one end is connected with the inverting input of the operational amplifier, other end ground connection.
9. power control system according to claim 7, it is characterised in that：The output filter capacitor current information acquisition module
Including operational amplifier, the first electric capacity and first resistor；
The operational amplifier includes normal phase input end, inverting input and output end；The positive of the operational amplifier is defeated
Enter end to be connected between the 3rd resistor and the 4th resistance；
First electric capacity is connected to form cascaded structure with the first resistor, and described cascaded structure one end is put with the computing
The inverting input of big device is connected, other end ground connection.
10. power control system according to claim 8 or claim 9, it is characterised in that：The laminating module includes second resistance,
Described second resistance one end is connected with the inverting input of the operational amplifier, and the other end is defeated with the operational amplifier
Go out end to be connected.
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| CN201610297933.0A CN107346933B (en) | 2016-05-06 | 2016-05-06 | Feedforward control circuit and power control system |
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| CN201610297933.0A CN107346933B (en) | 2016-05-06 | 2016-05-06 | Feedforward control circuit and power control system |
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Cited By (1)
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|---|---|---|---|---|
| CN110611432A (en) * | 2019-10-18 | 2019-12-24 | 矽力杰半导体技术(杭州)有限公司 | Control circuit and control method of switching converter |
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