CN106329924B - A kind of system improving load transient response performance - Google Patents
A kind of system improving load transient response performance Download PDFInfo
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- CN106329924B CN106329924B CN201610804047.2A CN201610804047A CN106329924B CN 106329924 B CN106329924 B CN 106329924B CN 201610804047 A CN201610804047 A CN 201610804047A CN 106329924 B CN106329924 B CN 106329924B
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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
Abstract
The invention belongs to DC-DC conversion art more particularly to a kind of systems for improving load transient response performance.System includes: PWM control unit, is connect with power input, and control signal is generated, and changes the electric current and voltage of power output end using control signal；Compensating unit, lotus root are connected between PWM control unit, power output end, carry out slope-compensation according to the electric current of power output end and voltage, the electric current of power input and voltage, and PWM control unit generates control signal according to the slope of compensation；Sampling unit, lotus root are connected between compensating unit, power output end, sample the voltage and current of power output end；Adjust unit, it is connect respectively with PWM control unit, compensating unit, sampling unit, when the current or voltage of power output end changes, sampling unit does operation to the voltage of power output end, obtain voltage variety, it adjusts unit and reduces voltage variety, PWM control unit generates control signal according to reduced voltage variety.
Description
Technical field
The invention belongs to DC-DC conversion art more particularly to a kind of systems for improving load transient response performance.
Background technique
Currently, the topological structure of BUCK class DC/DC converter 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 include pulse width modulator (Pulse Width
Modulator, PWM) control loop, when load current quickly changes, due to the lag of output inductor and control loop
Effect, so that output voltage generates very big deviation oscillation and needs the long period that can just be restored to initial set value.To understand
Certainly this problem, traditional scheme be many filter capacitors are used in parallel, although this method can efficiently control output
The deviation oscillation of voltage, but reaction speed is very slow, and due to having used a large amount of filter capacitor, cause volume to increase, at
This increase.
Summary of the invention
In view of the problems of the existing technology, the present invention provides a kind of BUCK class DC/DC converters to improve load transient
The system of response performance, system quick response load current variation, the deviation amplitude for reducing output voltage, can reduce simultaneously
The aggregate demand capacity of external storage capacitor.
The present invention adopts the following technical scheme:
A kind of system improving load transient response performance, the Buck DC-DC electricity applied to current type PWM control
Lu Zhong, the system comprises:
Power input and power output end；
PWM control unit is connect with the power input, generates control signal, and change using the control signal
Become the electric current and voltage of the power output end；
Compensating unit, lotus root is connected between the PWM control unit, the power output end, according to the power output end
Electric current and voltage, the electric current of the power input and voltage carry out slope-compensation, and the PWM control unit is according to benefit
The slope repaid generates the control signal；
Sampling unit, lotus root are connected between the compensating unit, the power output end, sample the electricity of the power output end
Pressure and electric current；
Unit is adjusted, is connect respectively with the PWM control unit, the compensating unit, the sampling unit, and；
When the current or voltage of the power output end changes, the sampling unit is to the power output end
Voltage does operation, obtains voltage variety, and the adjusting unit reduces the voltage variety, the PWM control unit according to
The voltage variety reduced generates the control signal.
Preferably, the PWM control unit includes:
The first transistor, lotus root are connected between the power input and the compensating unit；
Second transistor, lotus root are connected between the first transistor and a ground terminal；
MOSFET driving circuit is connect, according to described respectively with the grid of the first transistor, the second transistor
Control signal controls the conducting and cut-off of the first transistor, the second transistor；
PWM generator, the forward end of the PWM generator are connect with the compensating unit, the PWM generator it is reversed
End is connect with the adjusting unit, and the output end of the PWM generator is connect with the MOSFET driving circuit, generates the control
Signal processed.
Preferably, the MOSFET driving circuit includes trigger and/or the PWM generator is comparator.
Preferably, the compensating unit includes:
Filter inductance is connect with the PWM control unit；
The forward end of first operational amplifier, first operational amplifier is connect with the filter inductance, and described first
The backward end of operational amplifier is connect with the power output end, and the output end and the PWM of first operational amplifier are controlled
Unit connection processed；And
Calculated according to the inductive current of the filter inductance and need to compensate the offset voltage of slope, by the offset voltage and
The value of the first operational amplifier output terminal output is superimposed by Voltage loop, obtains composite signal, the PWM control unit root
The control signal is generated according to the composite signal.
Preferably, the slope of the compensating unit compensation is greater than the half of the inductive current descending slope.
Preferably, the sampling unit includes:
Lotus root after first divider resistance and the second divider resistance, first divider resistance and second divider resistance series connection
It is connected between the power output end and a ground terminal；
Operational transconductance amplifier, the backward end of the operational transconductance amplifier respectively with first divider resistance, described
The forward end of the connection of second divider resistance, the operational transconductance amplifier accesses a reference voltage；And
The operational transconductance amplifier samples the electricity by first divider resistance and/or second divider resistance
The partial pressure of source output terminal makees operation using the partial pressure and the reference voltage of the operational amplifier, obtains the voltage change
Amount.
Preferably, the adjusting unit includes:
Metal-oxide-semiconductor, the source electrode of the metal-oxide-semiconductor are connect with a power supply, and the grid of the metal-oxide-semiconductor is connect with the sampling unit,
The drain electrode of the metal-oxide-semiconductor is connect by a 3rd resistor with the PWM control unit；
The source electrode of first PMOS tube, first PMOS tube is connect with the power supply, the grid of first PMOS tube with
The drain electrode of first PMOS tube connects；
The source electrode of second PMOS tube, second PMOS tube is connect with the power supply, the second PMOS tube grid and institute
The grid connection of the first PMOS tube is stated, the drain electrode of second PMOS tube is connect with the PWM control unit；
NMOS tube, the source electrode of the NMOS tube are connect with the drain electrode of first PMOS tube, and the drain electrode of the NMOS tube is logical
One the 4th resistance is crossed to connect with a ground terminal；
Second operational amplifier, the in-phase end of the second operational amplifier are connect with the compensating unit, and described second
The backward end of operational amplifier is connect by the 4th resistance with the ground terminal, the output end of the second operational amplifier
It is connect with the grid of the NMOS tube；
Common-source common-gate current mirror, a current source are connect with the source electrode of the transistor in the common-source common-gate current mirror, institute
State the source electrode of another transistor in common-source common-gate current mirror respectively with the 3rd resistor, the PWM control unit, described
The drain electrode of two PMOS tube connects.
Preferably, when the electric current of the power output end is by Iout1It is changed to Iout2When, the public affairs of the voltage variety △ VC
Formula are as follows:
；
Wherein, it is I that VC2, which is the electric current of the power output end,out2When, the voltage of the metal-oxide-semiconductor grid, VC1 is described
The electric current of power output end is Iout1When, the voltage of the metal-oxide-semiconductor grid, VCO2 is that the electric current of the power output end is Iout2
When, the adjusting unit is exported to the voltage of the PWM control unit, and VCO1 is that the electric current of the power output end is Iout1
When, the adjusting unit is exported to the voltage of the PWM control unit, and K is and the second operational amplifier and the compensation
The relevant constant of unit, R3 are the resistance value of 3rd resistor.
The beneficial effects of the present invention are:
The present invention adjusts unit by increasing by one, and the variable quantity of load current is reduced, or even without influence to improve PWM
Load transient response performance in DC-DC conversion circuit, the present invention can reduce the shake of harmonic wave bring subharmonic by harmonic compensation
Problem is swung, and circuit design of the invention is relatively simple, it is convenient to carry out.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, the present invention and its feature, outer
Shape and advantage will become more apparent.Identical label indicates identical part in all the attached drawings.Not can according to than
Example draws attached drawing, it is preferred that emphasis is shows the gist of the present invention.
Fig. 1 is the topological diagram of the current mode PWM BUCK DC-DC conversion circuit of the embodiment of the present invention one；
Fig. 2 a-2c is the schematic illustration of slope-compensation of the present invention；
Fig. 3 is the topological diagram of improved PWM BUCK DC-DC conversion circuit in the embodiment of the present invention two.
Specific embodiment
It should be noted that in the absence of conflict, following technical proposals be can be combined with each other between technical characteristic.
The present invention provides a kind of systems for improving load transient response performance, and the system of following examples is with Buck
Type DC-DC conversion circuit is illustrated, and feeds back and controls frequently with PWM in Buck type DC-DC circuit design
Mode processed is to adjust 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 current inner loop and outer voltage double -loop control, and the variation of input voltage and load will react first in filtered electrical
On inducing current, there is faster response speed when input voltage or load change.Controlled in Current Mode and Based mode has peak value inductance
Current control and average inductor current control two ways.
Peak inductive current control described in this embodiment is since its advantage is widely used, but it has intrinsic open
Ring wild effect, while improving rapidity, the problem of also bringing stability.When input voltage is down to one close to defeated
Out when the value of voltage, duty ratio increases to maximum turn-on time, and further decreasing for input voltage will make main switch more than one
It is tended to remain in the time in a period, until duty ratio is up to 100 %, at this moment sub- harmonic oscillation may occur for circuit, need
The stability that this constant framework is kept by a slope equalizer is by inductance in big space rate
Current signal increases a compensation slope to realize.
The present invention is further illustrated with specific embodiment with reference to the accompanying drawing, but not as limit of the invention
It is fixed.
Embodiment one
A kind of system of the raising load transient response performance of the present embodiment, the system may include power input IN,
Power output end OUT, PWM control unit, compensating unit and sampling unit, the system of the present embodiment is with current type PWM BUCK
DC-DC (DC-DC) conversion circuit is illustrated.
As shown in Figure 1, PWM control unit include one usually be internally integrated PWM generator (PWM is expressed as in Fig. 1),
The auxiliary functional circuits such as MOSFET driving circuit (Driver circuit) and other reference voltage sources, soft start；The
One transistor Q1 and second transistor Q2 is respectively control switch pipe and continued flow switch pipe, usually MOSFET, the first transistor
Q1 and second transistor Q2 is connected and ends according to the driving signal of MOSFET driving circuit.
Compensating unit includes: that inductance L is output inductor, can be equivalent to ideal inductance and equivalent d.c. resistance string
Connection；Slope-compensation circuit (not shown) carries out slope-compensation using inductive current IL, inductive drop；First operation amplifier
Two input terminals of device OPAMP1, the first operational amplifier OPAMP1 are connected in parallel on first resistor Rs, by inductive drop and output
Input value of the voltage as two input terminals of the first operational amplifier OPAMP1 is held, the first operational amplifier OPAMP1 is by putting
Macrooperation obtains output valve Vsense, and by the output valve Vsense's of the first operational amplifier OPAMP1 and compensation slope Mc
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, on the first divider resistance R1 is normally referred to as
Divider resistance, the second divider resistance R2 are lower divider resistance；Operational transconductance amplifier OTA, operational transconductance amplifier OTA's is reversed
Input value of the partial pressure FB of end sampling divider resistance as the reverse input end of operational transconductance amplifier OTA, operational transconductance amplification
The forward end of device OTA inputs a reference voltage VREF, partial pressure FB of the operational transconductance amplifier OTA to reference voltage VREF and sampling
Operation is compared, the output end of operational transconductance amplifier OTA connects the backward end of PWM generator, operational transconductance amplifier OTA's
Reference voltage of the output valve as PWM generator.
Based on the structure of subelement each in above system, below between device in each subelement connection relationship and
Working principle is illustrated:
In PWM control unit, the first transistor Q1 lotus root is connect between power input and filter inductance L, the first transistor
The grid of Q1 connect with MOSFET driving circuit, second transistor Q2 lotus root is connected to filter inductance L and the first transistor Q1 and is formed
Node and ground terminal between, and the grid of second transistor Q2 is also connect with MOSFET driving circuit, MOSFET driving electricity
Road generates driving signal, controls the conducting and cut-off of the first transistor Q1 and second transistor Q2, i.e. MOSFET driving circuit is logical
The duty ratio for changing the first transistor Q1 and second transistor Q2 is crossed, and then adjusts the output electric current I of power output end OUTOUTWith
Output voltage VOUT。
In the present embodiment, PWM generator can be a comparator, the output end and MOSFET driving circuit of PWM generator
Connection, the driving signal that MOSFET driving circuit generates are generated according to the value of PWM generator output end output.
Filter inductance lotus root is connected between first resistor Rs and the first transistor Q1, the forward direction of the first operational amplifier OPAMP1
End is connect with filter inductance, the first operational amplifier OPAMP1
Backward end connect with power output end OUT, the first operational amplifier OPAMP1 is by filter inductance voltage and power supply
Output end voltage Vout amplifies operation after comparing, and obtains the output voltage values of the first operational amplifier OPAMP1
Vsense obtains compensation slope Mc according to slope M1, M2 of inductive current IL and inductive drop, and calculates compensation slope Mc
The value Vslope of corresponding slope-compensation voltage, using Vsense and Vslope as two input values of Voltage loop, superposition is obtained
The input value Vsum of PWM generator positive input.
The output end of operational transconductance amplifier OTA and the reverse input end of PWM generator connect, also, operational transconductance is put
The output end of big device OTA also passes through a second resistance Rc and capacitor Cc ground connection.Operational transconductance amplifier OTA is electric by power output end
The partial pressure of pressure Vout compares the input of value Vc that operation obtains as PWM generator backward end with a reference voltage VREF, with
Control for subsequent MOSFET driving circuit.
When above-mentioned " slope-compensation " is referred to current control mode, a part of sawtooth voltage is added to control signal
On, to improve control characteristic, including harmonic carcellation oscillation.Switching Power Supply is obtained extensively with the advantages that its high efficiency, small size
Application, current type PWM has better voltage regulation factor and load regulation, and the stability and dynamic characteristic of system also obtains
It is apparent to improve.The BUCK DC-DC converter work of current-mode is greater than the condition of 50% and continuous inductive current in duty ratio
Under, harmonic oscillation can be generated, be now analyzed as follows its basic compensation principle: harmonic oscillation Producing reason is: as Fig. 2 a- schemes
Shown in 2b, at the t0 moment, the first transistor Q1 and second transistor Q2 conducting make inductive current with slope m1 rising, the slope
Be defeated operational transconductance amplifier output end output voltage Vc1 and power output end electric current Iout1 function slope.When t1
It carves, inductive current IL sampling input reaches by the thresholding of control Voltage Establishment, the first transistor Q1 and second transistor Q2 shutdown,
At this point, electric current is with the oblique of the function of the output voltage Vc2 of operational transconductance amplifier output end and the electric current Iout2 of power output end
Rate m2 decline, starts until next cycle of oscillation.
Due to increasing current inner loop control, after inductive current sampling, composite signal Vsum and operational transconductance amplifier OTA
Output Vc be sent into PWM generator and compare, the voltage of operational transconductance amplifier OTA enters PWM generator and participates in duty ratio
It adjusts, by the MOSFET driving unit such as RS trigger, the stabilization of out-put supply output end vo ut is effectively ensured.Wherein duty
It is power input voltage than D=Vout/Vin, Vin.The limitation that peak inductive current regulating system has its intrinsic, example
Such as, the control voltage of output all the way of oscillator can be with the variation of duty ratio corresponding.
After N period, if slope m2 < m1, i.e. duty ratio are less than 50 %, the disturbance of peak inductive current
Convergence;If m2 > m1, i.e., when duty ratio is greater than 50 %, the disturbance diverging of peak inductive current was disturbed in each week
After the amplification of phase so that system is extremely unstable, so not adding the anti-interference of the system power supply of slope-compensation very poor.It is added and mends
After inductive current I L after repaying electric current, as shown in Fig. 2 c, as mc > 0. 5 m2, i.e. the slope of oblique wave compensation is had to
Greater than the half of inductive current descending slope, slope-compensation can be such that inductive current obviously restrains, and can make system well
Reach stable, otherwise can generate subharmonic oscillation when the duty ratio of system is greater than 50%.
Embodiment two
On the basis of embodiment one, the system of the present embodiment increases an adjusting unit, which can
The variable quantity for reducing operational transconductance amplifier OTA output voltage Vc greatly improves the negative of current mode PWM DC-DC conversion circuit
The problem of carrying transient response performance, having evaded reduction oblique wave compensation bring subharmonic oscillation completely, and circuit realization is simpler
It is single.
As shown in Figure 2 a, load current Iout is bigger, and the value of operational transconductance amplifier OTA output voltage VC is bigger, when negative
Electric current is carried by IOUT1Change to IOUT2Constantly, the variable quantity of corresponding operational transconductance amplifier OTA output voltage VC is △ VC.It is aobvious
So, when load current Iout changes, the value of corresponding variable quantity △ VC is smaller, the load transient response of DC-DC conversion circuit
Performance is better.
As shown in figure 3, the adjusting unit of the present embodiment is connected to the output end of operational transconductance amplifier OTA and PWM occurs
Between device, i.e., the connection between the output end and PWM generator of the operational transconductance amplifier OTA of embodiment one kind is disconnected, drawn
Enter an adjusting unit to connect between the output end and PWM generator of 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
Operation is done in the output of amplifier OTA, so that the variable quantity △ VC of VC is greatly reduced when load current changes, from
And greatly improve the load transient response performance of system.
Above-mentioned adjusting unit includes: the first PMOS tube PM1 and the second PMOS tube PM2, the source electrode of the first PMOS tube PM1 with
One power vd D connection, the grid of the first PMOS tube PM1 are connect with the drain electrode of the first PMOS tube PM1, the source of the second PMOS tube PM2
Pole is connect with power vd D, and the grid of the second PMOS tube PM2 is connect with the grid of the first PMOS tube PM1, the second PMOS tube PM2's
Drain electrode is connect with the backward end of PWM generator.
Adjust unit further include: second operational amplifier OPAMP2, the in-phase end of second operational amplifier OPAMP2 and the
The output end of one operational amplifier connects；Adjusting unit further includes NMOS tube N1, the source electrode of NMOS tube N1 and the first PMOS tube PM1
Drain electrode connection, the grid of NMOS tube connect with the output end of second operational amplifier OPAMP2, the source electrode of NMOS tube and second
The unidirectional section of operational amplifier OPAMP2 connects, and the drain electrode of NMOS tube also passes through one the 4th resistance R4 ground connection.
Adjusting unit further includes a metal-oxide-semiconductor, and the grid of the metal-oxide-semiconductor is connect with the output end of operational transconductance amplifier OTA,
The source electrode of metal-oxide-semiconductor is connect with power vd D, and the drain electrode of metal-oxide-semiconductor is connected by the backward end of a 3rd resistor R3 and PWM generator.
Adjusting unit further includes a common-source common-gate current mirror, and a current source Ib accesses a common-source common-gate current mirror transistor
Drain electrode, the output transistor of common-source common-gate current mirror are connect with 3rd resistor.
Adjust the working principle of unit are as follows:
Because, wherein Is be the second PMOS tube drain current, K be the first operational amplifier OPAMP1 and
The amplification coefficient that second operational amplifier OMAMP2 is determined.
By, whereinBetween the grid and source electrode of metal-oxide-semiconductor M1
Voltage, therefore can be gone out by above-mentioned two derivation of equation:
；
When load current is by IOUT1It become greater to IOUT2When,
；Wherein,Change the value of front and back for Vc,For the value of Vco variation front and back.
Similarly, when load current is by IOUT1It is varied down to IOUT2When:
；
As can be seen from the above formula that all becoming smaller before the value comparison of △ VC when load current Iout variation.
Choose suitable R3With k value, the value of △ VC can be made close to 0, load transient response can greatly be improved using this method
And the influence of oblique wave compensation can be ignored completely.In this way when loading variation, VC is worth fluctuation just minimum, then system
The performance of load transient response will be greatly improved.
In conclusion the present invention adjusts unit by increasing by one, the variable quantity of load current is reduced, in addition without influence with
Improve load transient response performance in PWM DC-DC conversion circuit, the present invention can reduce harmonic wave bring by harmonic compensation
Subharmonic shakes problem, and circuit design of the invention is relatively simple, convenient to carry out.
Presently preferred embodiments of the present invention is described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, devices and structures not described in detail herein should be understood as gives reality with the common mode in this field
It applies；Anyone skilled in the art, without departing from the scope of the technical proposal of the invention, all using the disclosure above
Methods and technical content many possible changes and modifications are made to technical solution of the present invention, or be revised as equivalent variations etc.
Embodiment is imitated, this is not affected the essence of the present invention.Therefore, anything that does not depart from the technical scheme of the invention, foundation
Technical spirit of the invention any simple modifications, equivalents, and modifications made to the above embodiment, still fall within the present invention
In the range of technical solution protection.
Claims (7)
1. a kind of system for improving load transient response performance, which is characterized in that the Buck applied to current type PWM control is straight
In stream-DC circuit, the system comprises:
Power input and power output end；
PWM control unit is connect with the power input, generates control signal, and change institute using the control signal
State the electric current and voltage of power output end；
Compensating unit, lotus root is connected between the PWM control unit, the power output end, according to the electricity of the power output end
Stream and voltage, the electric current of the power input and voltage carry out slope-compensation, and the PWM control unit is according to compensation
Slope generates the control signal；
Sampling unit, lotus root are connected between the compensating unit, the power output end, sample the power output end voltage and
Electric current；
Unit is adjusted, is connect respectively with the PWM control unit, the compensating unit, the sampling unit, and；
When the current or voltage of the power output end changes, voltage of the sampling unit to the power output end
Operation is done, voltage variety is obtained, the adjusting unit reduces the voltage variety, and the PWM control unit is according to reduction
The voltage variety generate the control signal；
The compensating unit includes:
Filter inductance is connect with the PWM control unit；
The forward end of first operational amplifier, first operational amplifier is connect with the filter inductance, first operation
The backward end of amplifier is connect with the power output end, and the output end of first operational amplifier and PWM control are single
Member connection；And
It is calculated according to the inductive current of the filter inductance and needs to compensate the offset voltage of slope, by the offset voltage and described
The value of first operational amplifier output terminal output is superimposed by Voltage loop, obtains composite signal, the PWM control unit is according to institute
It states composite signal and generates the control signal.
2. the system according to claim 1 for improving load transient response performance, which is characterized in that the PWM control is single
Member includes:
The first transistor, lotus root are connected between the power input and the compensating unit；
Second transistor, lotus root are connected between the first transistor and a ground terminal；
MOSFET driving circuit is connect with the grid of the first transistor, the second transistor respectively, according to the control
Signal controls the conducting and cut-off of the first transistor, the second transistor；
PWM generator, the forward end of the PWM generator are connect with the compensating unit, the backward end of the PWM generator with
The adjusting unit connection, the output end of the PWM generator are connect with the MOSFET driving circuit, generate the control letter
Number.
3. the system according to claim 2 for improving load transient response performance, which is characterized in that the MOSFET driving
Circuit includes trigger and/or the PWM generator is comparator.
4. the system according to claim 1 for improving load transient response performance, which is characterized in that the compensating unit is mended
The slope repaid is greater than the half of the inductive current descending slope.
5. the system according to claim 1 for improving load transient response performance, which is characterized in that the sampling unit packet
It includes:
Lotus root is connected to after first divider resistance and the second divider resistance, first divider resistance and second divider resistance series connection
Between the power output end and a ground terminal；
Operational transconductance amplifier, the backward end of the operational transconductance amplifier respectively with first divider resistance, described second
The forward end of divider resistance connection, the operational transconductance amplifier accesses a reference voltage；And
The operational transconductance amplifier is defeated by first divider resistance and/or second divider resistance sampling power supply
The partial pressure of outlet makees operation using the partial pressure and the reference voltage of the operational amplifier, obtains the voltage variety.
6. the system according to claim 1 for improving load transient response performance, which is characterized in that the adjusting unit packet
It includes:
Metal-oxide-semiconductor, the source electrode of the metal-oxide-semiconductor are connect with a power supply, and the grid of the metal-oxide-semiconductor is connect with the sampling unit, described
The drain electrode of metal-oxide-semiconductor is connect by a 3rd resistor with the PWM control unit；
The source electrode of first PMOS tube, first PMOS tube is connect with the power supply, the grid of first PMOS tube with it is described
The drain electrode of first PMOS tube connects；
The source electrode of second PMOS tube, second PMOS tube is connect with the power supply, the second PMOS tube grid and described the
The grid of one PMOS tube connects, and the drain electrode of second PMOS tube is connect with the PWM control unit；
NMOS tube, the source electrode of the NMOS tube are connect with the drain electrode of first PMOS tube, and the drain electrode of the NMOS tube passes through one
4th resistance is connect with a ground terminal；
Second operational amplifier, the in-phase end of the second operational amplifier are connect with the compensating unit, second operation
The backward end of amplifier is connect by the 4th resistance with the ground terminal, the output end of the second operational amplifier and institute
State the grid connection of NMOS tube；
Common-source common-gate current mirror, a current source is connect with the source electrode of the transistor in the common-source common-gate current mirror, described total
The source electrode of another transistor in the source common-gate current mirror of source respectively with the 3rd resistor, the PWM control unit, described second
The drain electrode of PMOS tube connects.
7. the system according to claim 6 for improving load transient response performance, which is characterized in that when the power supply exports
The electric current at end is by Iout1It is changed to Iout2When, the formula of the voltage variety △ VC are as follows:
△ VC=VC2-VC1=(VCO2-VCO1)-k (IOUT2-IOUT1)·R3；
Wherein, it is I that VC2, which is the electric current of the power output end,out2When, the voltage of the metal-oxide-semiconductor grid, VC1 is that the power supply is defeated
The electric current of outlet is Iout1When, the voltage of the metal-oxide-semiconductor grid, VCO2 is that the electric current of the power output end is Iout2When, it is described
It adjusts unit to export to the voltage of the PWM control unit, VCO1 is that the electric current of the power output end is Iout1When, the tune
Section unit is exported to the voltage of the PWM control unit, and K is relevant to the second operational amplifier and the compensating unit
Constant, R3 are the resistance value of 3rd resistor.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610373306 | 2016-05-30 | ||
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| CN107659151B (en) * | 2017-04-24 | 2023-07-07 | 深圳市华芯邦科技有限公司 | Buck load current detection circuit and method without external sampling resistor |
| US10250118B1 (en) * | 2018-04-16 | 2019-04-02 | Nxp B.V. | PWM mode boost switching regulator with programmable pulse skip mode |
| CN109639119A (en) * | 2018-08-29 | 2019-04-16 | 厦门元顺微电子技术有限公司 | Driving circuit applied to DC-DC converter |
| CN111628646B (en) * | 2019-02-28 | 2021-07-20 | 通嘉科技股份有限公司 | Power supply controller and related control method |
| CN110868069B (en) * | 2019-12-13 | 2021-11-30 | 北京集创北方科技股份有限公司 | Voltage adjusting device, chip and electronic equipment |
| CN111446865B (en) * | 2020-05-08 | 2021-06-25 | 深圳威迈斯新能源股份有限公司 | Slope compensation control circuit and slope compensation control method |
| CN111596715A (en) * | 2020-05-29 | 2020-08-28 | 北京集创北方科技股份有限公司 | Voltage adjusting device, chip, power supply and electronic equipment |
| CN112965003A (en) * | 2021-02-01 | 2021-06-15 | 佛山市博顿光电科技有限公司 | Power supply aging load circuit |
| CN115113674A (en) * | 2022-06-15 | 2022-09-27 | 陕西半导体先导技术中心有限公司 | Controllable magnetic field generating device |
| CN115208190B (en) * | 2022-09-13 | 2022-12-20 | 深圳英集芯科技股份有限公司 | DCDC converter, switching power supply, and electronic device |
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