CN106329924A - System for improving load transient response performance - Google Patents
System for improving load transient response performance Download PDFInfo
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- CN106329924A CN106329924A CN201610804047.2A CN201610804047A CN106329924A CN 106329924 A CN106329924 A CN 106329924A CN 201610804047 A CN201610804047 A CN 201610804047A CN 106329924 A CN106329924 A CN 106329924A
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—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
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Abstract
The invention belongs to the field of DC-DC conversion, and particularly relates to a system for improving load transient response performance. The system comprises a PWM control unit, a compensation unit, a sampling unit and an adjustment unit, wherein the PWM control unit is connected with a power input end and generates control signals, and the control signals are used for changing current and voltage at the power output end; the compensation unit is coupled between the PWM control unit and the power output end, slope compensation is carried out according to the current and the voltage at the power output end and current and voltage at the power input end, and the PWM control unit generates control signals according to the compensated slope; the sampling unit is coupled between the compensation unit and the power output end and samples the current and the voltage at the power output end; and the adjustment unit is respectively connected with the PWM control unit, the compensation unit and the sampling unit, when the current or the voltage at the power output end changes, the sampling unit makes computation on the voltage at the power output end, a voltage change amount is obtained, the adjustment unit reduces the voltage change amount, and the PWM control unit generates control signals according to the reduced voltage change amount.
Description
Technical field
The invention belongs to DC-to-dc conversion art, particularly relate to a kind of system improving load transient response performance.
Background technology
At present, the topological structure of BUCK class DC/DC transducer is generally divided into non-isolated BUCK, normal shock, half-bridge and full-bridge etc.
Type, the BUCK class DC/DC converter topologies of the above-mentioned type all comprise pulse width modulator (Pulse Width
Modulator, PWM) control loop, when load current Rapid Variable Design, due to output inductor and control loop delayed
Effect so that output voltage produces the biggest deviation oscillation and needs the long period just can return to initial set value.For understanding
Certainly this problem, traditional scheme is by used in parallel, although this method can efficiently control output for a lot of filter capacitors
The deviation oscillation of voltage, but response speed is very slow, and owing to employing substantial amounts of filter capacitor, cause volume to increase, become
This increase.
Summary of the invention
The problem existed for prior art, the invention provides a kind of BUCK class DC/DC transducer and improves load transient
The system of response performance, this system quick responsive load curent change, the deviation amplitude of reduction output voltage, can reduce simultaneously
The aggregate demand capacity of outside storage capacitor.
The present invention adopts the following technical scheme that
A kind of system improving load transient response performance, is applied in the Buck DC-to-dc circuit that current type PWM controls,
Described system includes:
Power input and power output end；
PWM control unit, is connected with described power input, produces control signal, and utilizes described control signal to change institute
State electric current and the voltage of power output end；
Compensating unit, Rhizoma Nelumbinis is connected between described PWM control unit, described power output end, according to the electricity of described power output end
Stream and voltage, the electric current of described power input and voltage carry out slope-compensation, and described PWM control unit is according to compensation
Slope produces described control signal；
Sampling unit, Rhizoma Nelumbinis is connected between described compensating unit, described power output end, the voltage of described power output end of sampling and
Electric current；
Regulation unit, is connected with described PWM control unit, described compensating unit, described sampling unit respectively, and；
When the curtage of described power output end changes, the described sampling unit voltage to described power output end
Doing computing, obtain voltage variety, described regulation unit reduces described voltage variety, and described PWM control unit is according to reduction
Described voltage variety produce described control signal.
Preferably, described PWM control unit includes:
The first transistor, Rhizoma Nelumbinis is connected between described power input and described compensating unit；
Transistor seconds, Rhizoma Nelumbinis is connected between described the first transistor and an earth terminal；
MOSFET drive circuit, the grid with described the first transistor, described transistor seconds is connected respectively, according to described control
Signal controls described the first transistor, the conducting of described transistor seconds and cut-off；
PWM generator, the forward end of described PWM generator is connected with described compensating unit, the backward end of described PWM generator with
Described regulation unit connects, and the outfan of described PWM generator is connected with described MOSFET drive circuit, produces described control and believes
Number.
Preferably, described MOSFET drive circuit includes trigger, and/or described PWM generator is comparator.
Preferably, described compensating unit includes:
Filter inductance, is connected with described PWM control unit；
First operational amplifier, the forward end of described first operational amplifier is connected with described filter inductance, described first computing
The backward end of amplifier is connected with described power output end, and the outfan of described first operational amplifier and described PWM control single
Unit connects；And
Inductive current according to described filter inductance calculates the compensation voltage needing to compensate slope, by described compensation voltage and described
The value of the first operational amplifier output terminal output, by Voltage loop superposition, obtains composite signal, and described PWM control unit is according to institute
State composite signal and produce described control signal.
Preferably, the slope that described compensating unit compensates is more than 1/2nd of described inductive current descending slope.
Preferably, described sampling unit includes:
After first divider resistance and the second divider resistance, described first divider resistance and described second divider resistance series connection, Rhizoma Nelumbinis is connected to
Between described power output end and an earth terminal；
Operational transconductance amplifier, the backward end of described operational transconductance amplifier respectively with described first divider resistance, described second
Divider resistance connects, and the forward end of described operational transconductance amplifier accesses a reference voltage；And
Described operational transconductance amplifier is defeated by described first divider resistance and/or the described second divider resistance described power supply of sampling
Go out the dividing potential drop of end, utilize the dividing potential drop of described operational amplifier and described reference voltage to make computing, obtain described voltage variety.
Preferably, described regulation unit includes:
Metal-oxide-semiconductor, the source electrode of described metal-oxide-semiconductor and a power supply connect, and the grid of described metal-oxide-semiconductor is connected with described sampling unit, described
The drain electrode of metal-oxide-semiconductor is connected with described PWM control unit by one the 3rd resistance；
First PMOS, the source electrode of described first PMOS is connected with described power supply, and the grid of described first PMOS is with described
The drain electrode of the first PMOS connects；
Second PMOS, the source electrode of described second PMOS is connected with described power supply, described second PMOS grid and described the
The grid of one PMOS connects, and the drain electrode of described second PMOS is connected with described PWM control unit；
NMOS tube, the source electrode of described NMOS tube is connected with the drain electrode of described first PMOS, and the drain electrode of described NMOS tube is by one
4th resistance and an earth terminal connect；
Second operational amplifier, the in-phase end of described second operational amplifier is connected with described compensating unit, described second computing
The backward end of amplifier is connected with described earth terminal by described 4th resistance, the outfan of described second operational amplifier and institute
The grid stating NMOS tube connects；
Common-source common-gate current mirror, a current source is connected with the source electrode of the transistor in described common-source common-gate current mirror, described common
The source electrode of another transistor in the source common-gate current mirror of source respectively with described 3rd resistance, described PWM control unit, described second
The drain electrode of PMOS connects.
Preferably, when the electric current of described power output end is by Iout1It is changed to Iout2Time, the public affairs of described voltage variety △ VC
Formula is:
；
Wherein, VC2 be the electric current of described power output end be Iout2Time, the voltage of described metal-oxide-semiconductor grid, VC1 is described power supply
The electric current of outfan is Iout1Time, the voltage of described metal-oxide-semiconductor grid, VCO2 be the electric current of described power output end be Iout2Time, institute
State regulation unit output to the voltage of described PWM control unit, VCO1 be the electric current of described power output end be Iout1Time, described
The voltage of regulation unit output extremely described PWM control unit, K is relevant to described second operational amplifier and described compensating unit
Constant, R3 is the resistance of the 3rd resistance.
The invention has the beneficial effects as follows:
The variable quantity of load current, by increasing by a regulation unit, is reduced, even without impact to improve PWM DC-DC by the present invention
Load transient response performance in change-over circuit, the present invention can be asked by the subharmonic concussion that harmonic compensation reduction harmonic wave brings
Topic, and the circuit design of the present invention is relatively simple, it is simple to implement.
Accompanying drawing explanation
By the detailed description non-limiting example made with reference to the following drawings of reading, the present invention and feature thereof, outward
Shape and advantage will become more apparent.The part that labelling instruction identical in whole accompanying drawings is identical.Not can according to than
Example draws accompanying drawing, it is preferred that emphasis is illustrate the purport of the present invention.
Fig. 1 is the topological diagram of the current mode PWM BUCK DC-DC change-over circuit of the embodiment of the present invention one；
Fig. 2 a-2c is the principle schematic of slope-compensation of the present invention；
Fig. 3 is the topological diagram of the PWM BUCK DC-DC change-over circuit improved in the embodiment of the present invention two.
Detailed description of the invention
It should be noted that in the case of not conflicting, following technical proposals, can be mutually combined between technical characteristic.
The invention provides a kind of system improving load transient response performance, the system of below embodiment is all with Buck
Type DC-DC change-over circuit is illustrated, frequently with PWM feedback control in Buck type DC-DC circuit design
Mode processed is with regulation output voltage or electric current.The PWM control mode of the present embodiment uses Controlled in Current Mode and Based, current-mode control
Mode processed can be that first the change of current inner loop and outer voltage double-loop control, input voltage and load will react in filtered electrical
On inducing current, when changing, there is faster response speed at input voltage or load.Controlled in Current Mode and Based mode has peak value inductance
Electric current controls and average inductor current controls two ways.
Peak inductive current described in the present embodiment controls to be widely used due to its advantage, but it exists intrinsic opening
Ring wild effect, while improving rapidity, the problem also bringing stability.When input voltage is down to one close to defeated
When going out the value of voltage, dutycycle increases to maximum ON time, and reducing further of input voltage will make master switch more than one
Tending to remain in the time in individual cycle, until dutycycle reaches 100 %, at this moment circuit is it may happen that sub-harmonic oscillation, needs
To be kept the stability of this constant framework by a slope equalizer, be by inductance in the case of big space rate
Current signal increases by one and compensates what slope realized.
The present invention is further illustrated with specific embodiment below in conjunction with the accompanying drawings, but not as the limit of the present invention
Fixed.
Embodiment one
A kind of system improving load transient response performance of the present embodiment, this system can include power input IN, power supply
Outfan OUT, PWM control unit, compensating unit and sampling unit, the system of the present embodiment with current type PWM BUCK direct current-
Direct current (DC-DC) change-over circuit is illustrated.
As it is shown in figure 1, PWM control unit include one be generally internally integrated PWM generator (being expressed as PWM in Fig. 1),
MOSFET drive circuit (Driver circuit) and other such as auxiliary functional circuit such as reference voltage source, soft start；The
One transistor Q1 and transistor seconds Q2 is respectively and controls switching tube and continued flow switch pipe, usually MOSFET, the first transistor
Q1 and transistor seconds Q2 is according to the driving signal conduction of MOSFET drive circuit and cut-off.
Compensating unit includes: inductance L is output inductor, can be equivalent to ideal inductance and equivalent d.c. resistance string
Connection；Slope-compensation loop (not shown), utilizes inductive current IL, inductive drop to carry out slope-compensation；First operation amplifier
Two inputs of device OPAMP1, the first operational amplifier OPAMP1 are connected in parallel on the first resistance Rs, by inductive drop and output
Terminal voltage is as the input value of two inputs of the first operational amplifier OPAMP1, and the first operational amplifier OPAMP1 is by putting
Macrooperation obtains output valve Vsense, and by output valve Vsense of the first operational amplifier OPAMP1 with compensation slope Mc's
Slope-compensation voltage Vslope is overlapped as two inputs of Voltage loop, obtains the input of PWM generator positive input
Value Vsum.
Sampling unit includes the first divider resistance R1 and the second divider resistance R2, the first divider resistance R1 be normally referred to as on
Divider resistance, the second divider resistance R2 are lower divider resistance；Operational transconductance amplifier OTA, operational transconductance amplifier OTA's is reverse
Dividing potential drop FB of end sampling divider resistance is as the input value of the reverse input end of operational transconductance amplifier OTA, and operational transconductance amplifies
The forward end of device OTA inputs a reference voltage VREF, and operational transconductance amplifier OTA is to reference voltage VREF and dividing potential drop FB of sampling
Comparing computing, the outfan of operational transconductance amplifier OTA connects the backward end of PWM generator, operational transconductance amplifier OTA's
Output valve is as the reference voltage of PWM generator.
Based on the structure of each subelement in said system, below to annexation between device in each subelement and
Operation principle illustrates:
In PWM control unit, the first transistor Q1 Rhizoma Nelumbinis is connected between power input and filter inductance L, the Q1 of the first transistor
Grid be connected with MOSFET drive circuit, transistor seconds Q2 Rhizoma Nelumbinis is connected to the joint that filter inductance L and the first transistor Q1 are formed
Between point and earth terminal, and the grid of transistor seconds Q2 is also connected with MOSFET drive circuit, and MOSFET drive circuit produces
The raw signal that drives, control the first transistor Q1 and the conducting of transistor seconds Q2 and cut-off, i.e. MOSFET drive circuit is by changing
Become the first transistor Q1 and the dutycycle of transistor seconds Q2, and then the output electric current I of regulation power output end OUTOUTAnd output
Voltage VOUT。
In the present embodiment, PWM generator can be a comparator, the outfan of PWM generator and MOSFET drive circuit
Connecting, the driving signal that MOSFET drive circuit produces is that the value according to the output of PWM generator outfan produces.
Filter inductance Rhizoma Nelumbinis is connected between the first resistance Rs and the first transistor Q1, the forward of the first operational amplifier OPAMP1
End is connected with filter inductance, the first operational amplifier OPAMP1
Backward end be connected with power output end OUT, filter inductance voltage and power supply are exported by the first operational amplifier OPAMP1
Terminal voltage Vout is amplified computing after comparing, and obtains the output voltage values Vsense of the first operational amplifier OPAMP1, root
It is compensated slope Mc according to slope M1, M2 of inductive current IL and inductive drop, and calculates corresponding oblique of this compensation slope Mc
Rate compensates value Vslope of voltage, and using Vsense and Vslope as two input values of Voltage loop, superposition obtains PWM generator
Input value Vsum of positive input.
The outfan of operational transconductance amplifier OTA is connected with the reverse input end of PWM generator, and, operational transconductance is put
The outfan of big device OTA is also by one second resistance Rc and electric capacity Cc ground connection.Operational transconductance amplifier OTA is by power output end electricity
The pressure dividing potential drop of Vout and a reference voltage VREF compare the input as PWM generator backward end of value Vc that computing obtains, with
Control for follow-up MOSFET drive circuit.
When above-mentioned " slope-compensation " refers to use current control mode, a part of sawtooth voltage is added to control signal
On, to improve control characteristic, vibrate including harmonic carcellation.Switching Power Supply obtains extensively with its advantage such as high efficiency, small size
Application, current type PWM has more preferable voltage regulation factor and load regulation, and stability and the dynamic characteristic of system also obtain
Significantly improve.The BUCK DC-DC converter of current-mode is operated in dutycycle more than 50% and the condition of continuous inductive current
Under, harmonic oscillation can be produced, now the compensation principle that it is basic is analyzed as follows: harmonic oscillation Producing reason is: as Fig. 2 a-schemes
Shown in 2b, in the t0 moment, the first transistor Q1 and transistor seconds Q2 conducting, make inductive current increase with slope m1, this slope
It it is the output voltage Vc1 slope with the function of the electric current Iout1 of power output end of defeated operational transconductance amplifier outfan.During t1
Carving, inductive current IL sampling input reaches to be turned off by the thresholding controlling Voltage Establishment, the first transistor Q1 and transistor seconds Q2,
Now, oblique with the output voltage Vc2 of operational transconductance amplifier outfan and the function of the electric current Iout2 of power output end of electric current
Rate m2 declines, until next cycle of oscillation starts.
Owing to adding current inner loop control, after inductive current sampling, composite signal Vsum and operational transconductance amplifier OTA
Output Vc send into PWM generator and compare, the voltage of operational transconductance amplifier OTA enters PWM generator and participates in dutycycle
Regulation, through MOSFET driver elements such as RS triggers, is effectively ensured stablizing of out-put supply output end vo ut.Wherein duty
Ratio D=Vout/Vin, Vin are power input voltage.Peak inductive current regulation system has its intrinsic limitation, example
As, a road output of agitator controls voltage can be with the change of duty ratio corresponding.
At N all after date, if slope m2 < m1, i.e. dutycycle are less than 50 %, the disturbance of peak inductive current
Convergence;If m2 > m1, i.e. dutycycle are more than 50 %, the disturbance of peak inductive current dissipates, and disturbance is in each week
After the amplification of phase so that system extremely unstable, so not adding the anti-interference extreme difference of the system power supply of slope-compensation.Add and mend
After repaying the inductive current I L after electric current, as shown in Fig. 2 c, as mc > 0. 5 m2 time, i.e. the slope of oblique wave compensation have to
More than 1/2nd of inductive current descending slope, slope-compensation can make inductive current substantially restrain, and can make system well
Reach stable, otherwise can produce subharmonic oscillation when the dutycycle of system is more than 50%.
Embodiment two
On the basis of embodiment one, the system of the present embodiment adds a regulation unit, and this regulation unit can reduce
The variable quantity of operational transconductance amplifier OTA output voltage Vc greatly improves the load wink of current mode PWM DC-DC change-over circuit
State response performance, has evaded the problem reducing the subharmonic oscillation that oblique wave compensation brings completely, and circuit realiration is simpler.
As shown in Figure 2 a, load current Iout is the biggest, and the value of operational transconductance amplifier OTA output voltage VC is the biggest, when negative
Carry electric current by IOUT1Change to IOUT2Constantly, the variable quantity of corresponding operational transconductance amplifier OTA output voltage VC is △ VC.Aobvious
So, when load current Iout changes, the value of corresponding variable quantity △ VC is the least, the load transient response of DC-DC change-over circuit
Performance is the best.
As it is shown on figure 3, the regulation unit of the present embodiment is connected to outfan and the PWM generation of operational transconductance amplifier OTA
Between device, the connection between outfan and the PWM generator of a kind of operational transconductance amplifier OTA of embodiment will disconnect, draw
Enter between outfan and the PWM generator that a regulation unit connects an operational transconductance amplifier OTA.
In the present embodiment, by introducing one and the positively related variable of load current, and this variable and operational transconductance
Computing is done in the output of amplifier OTA so that when load current changes when, and the variable quantity △ VC of VC is greatly reduced, from
And greatly improve the load transient response performance of system.
Above-mentioned regulation unit includes: the first PMOS PM1 and the second PMOS PM2, the source electrode of the first PMOS PM1 with
One power vd D connects, and the grid of the first PMOS PM1 and the drain electrode of the first PMOS PM1 connect, the source of the second PMOS PM2
Pole is connected with power vd D, and the grid of the second PMOS PM2 and the grid of the first PMOS PM1 connect, the second PMOS PM2
Drain electrode is connected with the backward end of PWM generator.
Regulation unit also includes: the in-phase end of the second operational amplifier OPAMP2, the second operational amplifier OPAMP2 and the
The outfan of one operational amplifier connects；Regulation unit also includes NMOS tube N1, the source electrode of NMOS tube N1 and the first PMOS PM1
Drain electrode connect, the outfan connection of the grid of NMOS tube and the second operational amplifier OPAMP2, the source electrode of NMOS tube and second
The unidirectional section of connection of operational amplifier OPAMP2, and the drain electrode of NMOS tube is also by one the 4th resistance R4 ground connection.
Regulation unit also includes a metal-oxide-semiconductor, and the grid of this metal-oxide-semiconductor is connected with the outfan of operational transconductance amplifier OTA,
The source electrode of metal-oxide-semiconductor is connected with power vd D, and the drain electrode of metal-oxide-semiconductor is connected with the backward end of PWM generator by one the 3rd resistance R3.
Regulation unit also includes that a common-source common-gate current mirror, a current source Ib access a common-source common-gate current mirror transistor
Drain electrode, the output transistor of common-source common-gate current mirror and the 3rd resistance connect.
The operation principle of regulation unit is:
Because, wherein Is is the drain current of the second PMOS, and K is the first operational amplifier OPAMP1 and second
The amplification coefficient that operational amplifier OMAMP2 determines.
By, wherein,For between grid and the source electrode of metal-oxide-semiconductor M1
Voltage, therefore can be gone out by the above-mentioned two derivation of equation:
；
When load current is by IOUT1It become greater to IOUT2Time,
；Wherein,
Value before and after changing for Vc,Value before and after changing for Vco.
In like manner, when load current is by IOUT1It is varied down to IOUT2Time:
；
Can be seen that load current Iout changes when from above-mentioned formula, the value contrast of △ VC all diminished in the past.Choose
Suitably R3And k value so that the value of △ VC is close to 0, use the method can greatly improve load transient response and
The impact of oblique wave compensation can be ignored completely.So when load change when, VC is worth fluctuation the most minimum, then bearing of system
The performance carrying transient response will be greatly improved.
In sum, the variable quantity of load current, by increasing by a regulation unit, is reduced by the present invention, even without affect with
Improving load transient response performance in PWM DC-DC change-over circuit, the present invention can reduce what harmonic wave brought by harmonic compensation
Subharmonic concussion problem, and the circuit design of the present invention is relatively simple, it is simple to implement.
Above presently preferred embodiments of the present invention is described.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, the equipment and the structure that do not describe in detail the most to the greatest extent are construed as giving reality with the common mode in this area
Execute；Any those of ordinary skill in the art, without departing under technical solution of the present invention ambit, may utilize the disclosure above
Method and technology contents technical solution of the present invention is made many possible variations and modification, or be revised as equivalent variations etc.
Effect embodiment, this has no effect on the flesh and blood of the present invention.Therefore, every content without departing from technical solution of the present invention, foundation
The technical spirit of the present invention, to any simple modification made for any of the above embodiments, equivalent variations and modification, all still falls within the present invention
In the range of technical scheme protection.
Claims (8)
1. the system improving load transient response performance, it is characterised in that the Buck being applied to current type PWM control is straight
In stream-DC circuit, described system includes:
Power input and power output end；
PWM control unit, is connected with described power input, produces control signal, and utilizes described control signal to change institute
State electric current and the voltage of power output end；
Compensating unit, Rhizoma Nelumbinis is connected between described PWM control unit, described power output end, according to the electricity of described power output end
Stream and voltage, the electric current of described power input and voltage carry out slope-compensation, and described PWM control unit is according to compensation
Slope produces described control signal；
Sampling unit, Rhizoma Nelumbinis is connected between described compensating unit, described power output end, the voltage of described power output end of sampling and
Electric current；
Regulation unit, is connected with described PWM control unit, described compensating unit, described sampling unit respectively, and；
When the curtage of described power output end changes, the described sampling unit voltage to described power output end
Doing computing, obtain voltage variety, described regulation unit reduces described voltage variety, and described PWM control unit is according to reduction
Described voltage variety produce described control signal.
The system of raising load transient response performance the most according to claim 1, it is characterised in that described PWM controls single
Unit includes:
The first transistor, Rhizoma Nelumbinis is connected between described power input and described compensating unit；
Transistor seconds, Rhizoma Nelumbinis is connected between described the first transistor and an earth terminal；
MOSFET drive circuit, the grid with described the first transistor, described transistor seconds is connected respectively, according to described control
Signal controls described the first transistor, the conducting of described transistor seconds and cut-off；
PWM generator, the forward end of described PWM generator is connected with described compensating unit, the backward end of described PWM generator with
Described regulation unit connects, and the outfan of described PWM generator is connected with described MOSFET drive circuit, produces described control and believes
Number.
The system of raising load transient response performance the most according to claim 2, it is characterised in that described MOSFET drives
Circuit includes trigger, and/or described PWM generator is comparator.
The system of raising load transient response performance the most according to claim 1, it is characterised in that described compensating unit bag
Include:
Filter inductance, is connected with described PWM control unit；
First operational amplifier, the forward end of described first operational amplifier is connected with described filter inductance, described first computing
The backward end of amplifier is connected with described power output end, and the outfan of described first operational amplifier and described PWM control single
Unit connects；And
Inductive current according to described filter inductance calculates the compensation voltage needing to compensate slope, by described compensation voltage and described
The value of the first operational amplifier output terminal output, by Voltage loop superposition, obtains composite signal, and described PWM control unit is according to institute
State composite signal and produce described control signal.
The system of raising load transient response performance the most according to claim 4, it is characterised in that described compensating unit is mended
The slope repaid is more than 1/2nd of described inductive current descending slope.
The system of raising load transient response performance the most according to claim 1, it is characterised in that described sampling unit bag
Include:
After first divider resistance and the second divider resistance, described first divider resistance and described second divider resistance series connection, Rhizoma Nelumbinis is connected to
Between described power output end and an earth terminal；
Operational transconductance amplifier, the backward end of described operational transconductance amplifier respectively with described first divider resistance, described second
Divider resistance connects, and the forward end of described operational transconductance amplifier accesses a reference voltage；And
Described operational transconductance amplifier is defeated by described first divider resistance and/or the described second divider resistance described power supply of sampling
Go out the dividing potential drop of end, utilize the dividing potential drop of described operational amplifier and described reference voltage to make computing, obtain described voltage variety.
The system of raising load transient response performance the most according to claim 1, it is characterised in that described regulation unit bag
Include:
Metal-oxide-semiconductor, the source electrode of described metal-oxide-semiconductor and a power supply connect, and the grid of described metal-oxide-semiconductor is connected with described sampling unit, described
The drain electrode of metal-oxide-semiconductor is connected with described PWM control unit by one the 3rd resistance；
First PMOS, the source electrode of described first PMOS is connected with described power supply, and the grid of described first PMOS is with described
The drain electrode of the first PMOS connects；
Second PMOS, the source electrode of described second PMOS is connected with described power supply, described second PMOS grid and described the
The grid of one PMOS connects, and the drain electrode of described second PMOS is connected with described PWM control unit；
NMOS tube, the source electrode of described NMOS tube is connected with the drain electrode of described first PMOS, and the drain electrode of described NMOS tube is by one
4th resistance and an earth terminal connect；
Second operational amplifier, the in-phase end of described second operational amplifier is connected with described compensating unit, described second computing
The backward end of amplifier is connected with described earth terminal by described 4th resistance, the outfan of described second operational amplifier and institute
The grid stating NMOS tube connects；
Common-source common-gate current mirror, a current source is connected with the source electrode of the transistor in described common-source common-gate current mirror, described common
The source electrode of another transistor in the source common-gate current mirror of source respectively with described 3rd resistance, described PWM control unit, described second
The drain electrode of PMOS connects.
The system of raising load transient response performance the most according to claim 7, it is characterised in that when described power supply exports
The electric current of end is by Iout1It is changed to Iout2Time, the formula of described voltage variety △ VC is:
；
Wherein, VC2 be the electric current of described power output end be Iout2Time, the voltage of described metal-oxide-semiconductor grid, VC1 is that described power supply is defeated
The electric current going out end is Iout1Time, the voltage of described metal-oxide-semiconductor grid, VCO2 be the electric current of described power output end be Iout2Time, described
Regulation unit output to the voltage of described PWM control unit, VCO1 be the electric current of described power output end be Iout1Time, described tune
The voltage of joint unit output extremely described PWM control unit, K is relevant to described second operational amplifier and described compensating unit
Constant, R3 is the resistance of the 3rd resistance.
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