CN109149931B - Slope-error compensation circuit for peak value comparison method BUCK converter - Google Patents
Slope-error compensation circuit for peak value comparison method BUCK converter Download PDFInfo
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- CN109149931B CN109149931B CN201810997468.0A CN201810997468A CN109149931B CN 109149931 B CN109149931 B CN 109149931B CN 201810997468 A CN201810997468 A CN 201810997468A CN 109149931 B CN109149931 B CN 109149931B
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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
Abstract
The present invention relates to a kind of slope-error compensation circuits for peak value comparison method BUCK converter, belong to switch power technology field, and there are static errors for output electric current after solving the problems, such as peak value comparison method BUCK converter progress slope compensation in the prior art.Slope-error compensation circuit disclosed by the invention includes slope compensation sub-circuit, error compensation sub-circuit, conditioning amplification sub-circuit.The input signal of the error compensation sub-circuit is derived from the output voltage of BUCK converter, and error compensation value and BUCK converter output voltage are proportional, and is equal to the static error of slope compensation sub-circuit output electric current.Error compensation can be achieved in BUCK converter when therefore, to any duty cycle, eliminates static error caused by slope compensation.
Description
Technical field
The present invention relates to switch power technology fields more particularly to a kind of for the oblique of peak value comparison method BUCK converter
Slope-error compensation circuit.
Background technique
In existing Switching Power Supply control, common PWM control mode mainly has Average Current Control and peak value comparison method
Two ways.Compared with Average Current Control, the transient state closed loop response of peak value comparison method is fast, changes to input voltage and exports
The transient response for loading variation is also fast, has instantaneous peak current limitation function, can be realized auto parallel Connection and flow.
The PWM of existing typical peak current-mode control as shown in Figure 1, its characteristic signal waveform as shown in Fig. 2, using
Slope compensation scheme can be improved stability of the Peak Current-Mode Controlled Circuit when duty ratio is greater than 50%, account for although solving it
Open-loop unstable when sky is than greater than 50% reduces time slope oscillation, improves the output of BUCK converter to a certain extent
Current stability, but bring BUCK converter output current peak with target value there is a certain error.Specifically, as schemed
Shown in 3, the error of slope compensation RELATED APPLICATIONS electric current is
ΔIref=Ig-Iref(dTs)=mdTs
In formula, d is duty ratio, IgFor target current given value, IrefFor the current reference value exported after slope compensation, m is
Slope compensation slope, TsFor power switch tube switch periods.
As it can be seen that duty ratio is bigger, error is bigger, causes the accuracy decline of BUCK converter output current control.
Summary of the invention
In view of above-mentioned analysis, the embodiment of the present invention is intended to provide a kind of for the oblique of peak value comparison method BUCK converter
Slope-error compensation circuit carries out the output electric current after slope compensation solving existing peak value comparison method BUCK converter and deposits
The static error the problem of.
On the one hand, the embodiment of the invention provides a kind of slope for peak value comparison method BUCK converter-errors to mend
Repay circuit, including slope compensation sub-circuit, error compensation sub-circuit, conditioning amplification sub-circuit；The slope compensation sub-circuit and
Error compensation sub-circuit is in parallel, then connects with conditioning amplification sub-circuit；
The slope compensation sub-circuit, for receiving sawtooth signal, biasing voltage signal and the mesh of PWM controller output
Current signal is marked, the current reference signal output with slope compensation is converted into；
The error compensation sub-circuit is converted into above-mentioned electric current ginseng for receiving the voltage signal of BUCK converter output
Examine the corresponding error compensating signal output of signal；
Sub-circuit is amplified in the conditioning, for by the above-mentioned current reference signal with slope compensation and corresponding error compensation
Signal sums up, and exports the adduction result as the current reference signal for being used for peak value comparison method.
Above-mentioned technical proposal has the beneficial effect that: first, the input signal of error compensation sub-circuit is derived from BUCK transformation
Device output voltage, error compensation value and BUCK converter output voltage are proportional, therefore BUCK when to any duty cycle
Error compensation can be achieved in converter, eliminates static error caused by slope compensation.Second, slope compensation signal is derived from PWM control
Device processed, it is fully synchronized with VT1 switching frequency.
In another embodiment based on the above method, the slope compensation sub-circuit includes the amplifier module being sequentially connected in series
1, amplifier module 2；
The amplifier module 1 controls PWM for receiving sawtooth signal, the biasing voltage signal of PWM controller output
The sawtooth signal of device output processed is biased and reversely, generates the sawtooth signal of falling changed by zero and be transmitted to amplifier mould
Block 2；
The amplifier module 2 will the sawtooth for receiving above-mentioned sawtooth signal and the target current signal
Wave signal is overlapped with the target current signal, generates the current reference signal with slope compensation.
The beneficial effect of above-mentioned technical proposal is: the sawtooth signal that PWM controller exports is biased by amplifier module 1
With sawtooth signal reversed, that generation changes by zero, amplifier module 2 will the sawtooth signal and target current letter
It number is overlapped, generates the current reference signal with slope compensation.
Further, the error compensation sub-circuit includes the voltage acquisition module being sequentially connected in series, amplifier module 3；
The voltage acquisition module, for acquiring the voltage signal of BUCK converter output, by the voltage signal by height
Pressure signal is converted to low-voltage control signal, and the low-voltage control signal is transmitted to amplifier module 3；
The amplifier module 3 for amplifying the low-voltage control signal received by presupposition multiple, and is converted into electric current letter
Number output；The current signal of the output is the corresponding error compensating signal of the current reference signal with slope compensation.
The beneficial effect of above-mentioned further scheme is: voltage acquisition module acquires the voltage signal of BUCK converter output,
And it is fed back to error compensation sub-circuit, by voltage signal that BUCK converter exports by being converted to low pressure control by high-voltage signal
Signal processed, amplifier module 3 are converted into the electricity with slope compensation for amplifying the low-voltage control signal received by presupposition multiple
The corresponding error compensating signal of flow reference signal.
Further, the conditioning amplification sub-circuit includes reversed summing circuit；
The reversed summing circuit, for mending the current reference signal with slope compensation and the corresponding error
It repays signal to sum up, obtains and exported for the current reference signal of peak value comparison method.
The beneficial effect of above-mentioned further scheme is: the output after eliminating peak value comparison method BUCK converter slope compensation
Electric current static error guarantees that BUCK converter exports current control accuracy.
Further, the amplifier module 1 includes operational amplifier A1, resistance R1~R4；
The negative input of the operational amplifier A1, the sawtooth signal I through resistance R1 and PWM controller outputslope
Connection, connect through resistance R2 with the bias voltage that DC power supply provides, and connects through the output end of resistance R4 and A1；The forward direction of A1
Input terminal is grounded through resistance R3.
The beneficial effect of above-mentioned further scheme is: the circuit of the amplifier module 1 builds simple, Yi Shixian, it is subsequent more
It is easy to operate and cost is relatively low when parallel operation part, maintenance.
Further, the amplifier module 2 includes operational amplifier A2, resistance R5~R8；
The negative input of the operational amplifier A2 is connect, through electricity with the output end of operational amplifier A1 through resistance R6
Hinder R5 and target current signal IgConnection, and connected through the output end of resistance R8 and A2；The positive input of A2 connects through resistance R7
Ground.
The beneficial effect of above-mentioned further scheme is: the circuit of the amplifier module 2 builds simple, Yi Shixian, it is subsequent more
It is easy to operate and cost is relatively low when parallel operation part, maintenance.
Further, the voltage acquisition module includes Hall voltage sensor LEM, resistance R9, R10；
The positive input of the Hall voltage sensor LEM is through resistance R9 and input signal UoutAnode connection, LEM's
Negative input and input signal UoutNegative terminal connection, the output end of LEM are grounded through resistance R10.
The beneficial effect of above-mentioned further scheme is: the circuit of the voltage acquisition module builds simple, Yi Shixian, subsequent
It replaces easy to operate and cost is relatively low when device, maintenance.
Further, the amplifier module 3 includes operational amplifier A3, resistance R11~R13；
The negative input of the operational amplifier A3, through resistance R11 and LEM output end connection, and through resistance R13 with
The output end of A3 connects；The positive input of A3 is grounded through resistance R12.
The beneficial effect of above-mentioned further scheme is: the circuit of the amplifier module 3 builds simple, Yi Shixian, it is subsequent more
It is easy to operate and cost is relatively low when parallel operation part, maintenance.
Further, the reversed summing circuit includes operational amplifier A4, resistance R14~R17；
The negative input of the operational amplifier A4 is connect, through electricity with the output end of operational amplifier A3 through resistance R14
Resistance R16 is connect with the output end of operational amplifier A2, and is connected through the output end of resistance R17 and A4；The positive input of A4 passes through
Resistance R15 ground connection.
The beneficial effect of above-mentioned further scheme is: the circuit of the conditioning amplification sub-circuit builds simple, Yi Shixian, after
It is easy to operate and cost is relatively low when continuous replacement device, maintenance.
Further, the amplification factor of operational amplifier A2 and A4 is 1, and the amplification factor of operational amplifier A1 and A3 are distinguished
Are as follows:
KA1=m/m3
In formula, m is slope compensation slope, m3For the I of falling sawtooth waveslope' slope, UinFor BUCK converter input voltage,
KuFor voltage feedback factor, TsFor switch periods.
The beneficial effect of above-mentioned further scheme is: it gives and is able to achieve a kind of amplification factor setting of the invention, simple,
Easily debugging.
It in the present invention, can also be combined with each other between above-mentioned each technical solution, to realize more preferred assembled schemes.This
Other feature and advantage of invention will illustrate in the following description, also, certain advantages can become from specification it is aobvious and
It is clear to, or understand through the implementation of the invention.The objectives and other advantages of the invention can by specification, claims with
And it is achieved and obtained in specifically noted content in attached drawing.
Detailed description of the invention
Attached drawing is only used for showing the purpose of specific embodiment, and is not to be construed as limiting the invention, in entire attached drawing
In, identical reference symbol indicates identical component.
Fig. 1 is existing peak value comparison method BUCK converter principle figure；
Fig. 2 is existing peak value comparison method BUCK converter characteristic signal waveform；
Fig. 3 is existing peak value comparison method BUCK converter slope compensation RELATED APPLICATIONS current error；
Fig. 4 is 1 slope of the embodiment of the present invention-error compensation circuit structural schematic diagram；
Fig. 5 is 2 slopes of the embodiment of the present invention-error compensation circuit structural schematic diagram；
Fig. 6 is 2 slopes of the embodiment of the present invention-error compensation circuit figure；
Fig. 7 is 2 peak value comparison method BUCK converter principle schematic diagram of the embodiment of the present invention；
Fig. 8 is 2BUCK of embodiment of the present invention converter characteristic signal waveform；
Fig. 9 is that 2PWM of embodiment of the present invention controller generates sawtooth signal circuit composition figure；
Figure 10 is that 2PWM of embodiment of the present invention controller generates sawtooth signal schematic diagram；
Figure 11 is the current reference signal schematic diagram for peak value comparison method that the embodiment of the present invention 2 obtains.
Specific embodiment
Specifically describing the preferred embodiment of the present invention with reference to the accompanying drawing, wherein attached drawing constitutes the application a part, and
Together with embodiments of the present invention for illustrating the principle of the present invention, it is not intended to limit the scope of the present invention.
Embodiment 1
A specific embodiment of the invention, discloses a kind of error compensation for peak value comparison method BUCK converter
Circuit, connection relationship are as shown in Figure 4.Disclosed slope-the error for being used for peak value comparison method BUCK converter of the present embodiment
Compensation circuit includes slope compensation sub-circuit, error compensation sub-circuit, the sub- sub-circuit of conditioning amplification.The slope compensation sub-circuit
It is in parallel with error compensation sub-circuit, then connect with conditioning amplification sub-circuit.A kind of specific connection type is given below.
Specifically, slope compensation sub-circuit includes input terminal 1, input terminal 2, input terminal 3 and output end.Wherein, input terminal 1
The sawtooth signal of PWM controller PWM controller output is received, input terminal 2 receives the biasing voltage signal of user setting, biasing
The size of voltage is determined that input terminal 3 receives target current signal (given value of current signal), output end by sawtooth signal minimum value
Export the current reference signal with slope compensation.
The voltage signal of the input terminal acquisition BUCK converter output of error compensation sub-circuit, output end export above-mentioned electricity
The corresponding error compensating signal of flow reference signal.
Conditioning amplification sub-circuit includes input terminal 1, input terminal 2 and output end.It is defeated that input terminal 1 receives slope compensation sub-circuit
The current reference signal with slope compensation out, input terminal 2 receive the corresponding error compensation letter of error compensation sub-circuit output
Number.Its function is to sum up the above-mentioned current reference signal with slope compensation and corresponding error compensating signal, is used
In the current reference signal of peak value comparison method, output it.
Compared with prior art, slope-error compensation circuit provided in this embodiment has the advantages that following two:
First, the input signal of error compensation sub-circuit is derived from BUCK converter output voltage, error compensation value and BUCK
Converter output voltage is proportional, therefore error compensation can be achieved in BUCK converter when to any duty cycle, eliminates
Static error caused by slope compensation.
Second, slope compensation signal is derived from PWM controller, keeps fully synchronized with VT1 switching frequency, ensure that one is opened
It closes in the period, peak-current signal initial time is identical as slope compensation signal initial time.
Embodiment 2
It optimizes on the basis of the above embodiments, as shown in figure 5, slope compensation sub-circuit includes the fortune being sequentially connected in series
Amplification module 1, amplifier module 2.Amplifier module 1 will for receiving sawtooth signal, the biasing voltage signal of PWM controller output
The sawtooth signal of PWM controller output is biased and reversely, generates the sawtooth signal of falling changed by zero and be transmitted to
Amplifier module 2.Amplifier module 2 will the sawtooth wave for receiving above-mentioned sawtooth signal and the current reference signal
Signal is overlapped with the current reference signal, generates the current reference signal with slope compensation.
Preferably, as shown in fig. 6, amplifier module 1 includes operational amplifier A1, resistance R1~R4, amplifier module 2 includes fortune
Calculate amplifier A2, resistance R5~R8.Wherein, the negative input of operational amplifier A1, through resistance R1 and sawtooth signal Islope
Connection, connect through resistance R2 with -0.8V (bias voltage) DC power supply, and connect through resistance R4 with its output end；The forward direction of A1
Input terminal is grounded through resistance R3.The negative input of operational amplifier A2, the output end connection through resistance R6 and A1, through resistance R5
With target current signal IgConnection, and connected through the output end of resistance R8 and A2；The positive input of A2 is grounded through resistance R7.
Error compensation sub-circuit, including be sequentially connected in series voltage acquisition module, amplifier module 3.Voltage acquisition module is used for
The voltage signal for acquiring the output of BUCK converter, is converted to low-voltage control signal, voltage by high-voltage signal for the voltage signal
Feedback factor is Ku, and the low-voltage control signal is transmitted to amplifier module 3.Amplifier module 3, the low pressure for will receive
It controls signal to amplify by presupposition multiple, and is converted into current signal output；The current signal of the output is with slope compensation
The corresponding error compensating signal of current reference signal.
Preferably, voltage acquisition module includes Hall voltage sensor LEM, resistance R9, R10, and amplifier module 3 includes operation
Amplifier A3, resistance R11~R13.Wherein, the positive input of LEM is through resistance R9 and input signal UoutAnode connection, LEM's
Negative input and input signal UoutNegative terminal connection, output end connect through the negative input of resistance R11 and operational amplifier A3
It connects, and is grounded through resistance R10.Output end connection of the negative input of operational amplifier A3 also through resistance R13 and A3, it is positive
Input terminal is grounded through resistance R12.
Conditioning amplification sub-circuit includes reversed summing circuit.Reversed summing circuit, for by the electricity with slope compensation
Flow reference signal and the corresponding error compensating signal sum up, and obtain the current reference signal for being used for peak value comparison method
Output.
Preferably, reversed summing circuit, including operational amplifier A4, resistance R14~R17.Wherein, operational amplifier A4
Negative input is connect through resistance R14 with the output end of operational amplifier A3, and by the defeated of resistance R16 and operational amplifier A2
Outlet connection, and connected through the output end of resistance R17 and A4.
Preferably, the amplification factor of operational amplifier A2 and A4 is 1, and the amplification factor of operational amplifier A1 and A3 are distinguished
Are as follows:
KA1=m/m3 (1)
In formula, m is slope compensation slope, m3For the I of falling sawtooth waveslope' slope, UinFor BUCK converter input voltage,
KuFor voltage feedback factor, TsFor switch periods.
Parameter is known quantity above, and is immobilized in same BUCK converter.
Below by taking peak value comparison method BUCK converter in the prior art as an example, as shown in fig. 7, of the invention to introduce
Function.
Existing peak value comparison method BUCK converter generally use one by one pulse current limitation (switch periods is one
Pulse) mode, the current waveform of power switch tube is flowed through by real-time detection, decision at the time of its peak value reaches given value
The pulse width of PWM is exported, so that the conducting electric current transient state of power switch tube has relative independentability, can rapidly be become
Ideal current characteristic curve needed for parallel operation work, improves its dynamic responding speed and reliability.Existing peak value comparison method
The control principle of BUCK converter is using the output current signal waveform of power switch tube as carrier signal, with modulated signal
It is compared, to generate pwm control signal, the present embodiment improves the slope compensation circuit of the prior art on this basis, i.e.,
Slope compensation circuit in Fig. 1 is replaced using slope-error compensation circuit of the present embodiment Fig. 6, as shown in Figure 7.The present embodiment
In, BUCK converter characteristic signal waveform is as shown in Figure 8.
DC input voitage UinPositive contact solution capacitor C1Anode, high frequency capacitance C2One end, switching tube VT1 source electrode, direct current
Input voltage UinCathode meets electrolytic capacitor C1Cathode, capacitor C2The other end, sustained diode anode, publicly GND, load R mono-
End.Switching tube VT1 drain electrode is connected with sustained diode cathode, the one end afterflow inductance L, and another terminating load R of afterflow inductance L is another
One end.Pass through the peak-current signal I between switching tube VT1 and sustained diodefAs carrier signal, comparator is connected
Inverting input terminal；Target current signal IgI is believed with slope compensationslopeNew current reference letter is generated after slope compensation circuit
Number IrefAs modulated signal, IrefConnect the non-inverting input terminal of comparator；The R pin phase of comparator output terminal and rest-set flip-flop
Even, rest-set flip-flop S pin connects clock circuit, and rest-set flip-flop output pin Q connects driving circuit one end, another termination of driving circuit
The base stage of switching tube VT1.
After slope-error compensation circuit, sawtooth signal IslopeThe voltage deviation for subtracting 0.8V, by amplifier A1
Become the I of falling sawtooth signal that slope is m afterwardsslope', m=0.7~0.8m2, m2Inductance electricity when for switching tube largest duty cycle
Flow down drop angle rate.
The I of falling sawtooth signalslope' and target current signal IgBecome the current reference signal with slope compensation after superposition
Iref'.Output voltage UoutBecome error compensating signal Δ I after Hall voltage sensor LEM and amplifier A3ref, error benefit
It repays signal and the current reference signal with slope is superimposed, obtain final current controling signal Iref。
In the present embodiment, after peak-current mode controls BUCK converter addition slope compensation sub-circuit, error signal Δ
IrefWith slope compensation slope m, duty ratio d, switch periods TsIt is directly proportional.When circuit structure and fixed parameter, m, TsIt is constant, because
This, error signal is only related with duty ratio d.To eliminate error signal, duty ratio d need to be calculated.When BUCK converter works in electricity
When inducing current continuous mode, converter output voltage UoutWith input voltage UinBetween relationship are as follows:
The relationship of target target current signal amplitude and duty ratio are as follows:
Error compensation sub-circuit has carried out error compensation to the current reference signal after slope compensation, and compensation rate is big
Small related with duty ratio, voltage sensor LEM acquires converter output voltage Uout, feedback factor Ku, after acquisition voltage letter
Number it is input to operational amplifier 3, therefore, operational amplifier 3 exports result and is
With error signal Δ I caused by slope compensationrefIt is equal.
It willAs error compensating signal Δ Iref, the different duty moment (d in a switch periods1Ts、
d2Ts、d3Ts) obtain that one group of slope is identical, and the different parallel lines of intercept, duty ratio is bigger, and intercept is bigger, and compensation rate is bigger, such as
Shown in Figure 11, output electric current static error is compensated according to the size of output voltage.LEM acquires converter output voltage
Uout, the Signal averaging after error compensation circuit, with slope compensation forms new current reference signal Iref, IrefSignal connects
Connect the non-inverting input terminal of comparator.
In the present embodiment, slope compensation signal IslopeIt is derived from the sawtooth signal of PWM controller output, such as Fig. 9 and Figure 10
Shown, the pin 5,6,7 of PWM controller distinguishes external capacitor CT, resistance RTAnd resistance RD, clock oscillation circuit is constituted, 5 feet produce
Raw sawtooth signal, slope m3, the upper and lower thresholding of voltage is respectively UH=3.3V, UL=0.8V.
When implementation, when each switch periods start, rest-set flip-flop set, switching tube VT1Conducting, electric current IfIt is linearly increasing, when
Detect current signal IfGreater than modulated signal IrefWhen, comparator overturns and resets rest-set flip-flop, switching tube VT1Shutdown, inductance L
Energy storage passes through diode D afterflow.And so on, it generates and is used for driving switch pipe VT1The pwm signal being switched on or off.
Compared with Example 1, slope-error compensation provided in this embodiment for peak value comparison method BUCK converter
Circuit builds simpler, Yi Shixian, and when subsequent replacement device, maintenance is more easy to operate and cost is relatively low.
It will be understood by those skilled in the art that realizing all or part of the process of above-described embodiment method, meter can be passed through
Calculation machine program is completed to instruct relevant hardware, and the program can be stored in computer readable storage medium.Wherein, institute
Stating computer readable storage medium is disk, CD, read-only memory or random access memory etc..
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.
Claims (9)
1. a kind of slope-error compensation circuit for peak value comparison method BUCK converter, which is characterized in that mended including slope
Repay sub-circuit, error compensation sub-circuit, conditioning amplification sub-circuit；The slope compensation sub-circuit and error compensation sub-circuit are simultaneously
Connection, then connect with conditioning amplification sub-circuit；
The slope compensation sub-circuit, for receiving sawtooth signal, biasing voltage signal and the target electricity of PWM controller output
Signal is flowed, the current reference signal output with slope compensation is converted into；
The error compensation sub-circuit is converted into above-mentioned current reference letter for receiving the voltage signal of BUCK converter output
Number corresponding error compensating signal output；
Sub-circuit is amplified in the conditioning, for by the above-mentioned current reference signal with slope compensation and corresponding error compensating signal
It sums up, is exported the adduction result as the current reference signal for being used for peak value comparison method；
Above-mentioned slope compensation sub-circuit includes the amplifier module 1 being sequentially connected in series, amplifier module 2；
The amplifier module 1, for receiving sawtooth signal, the biasing voltage signal of PWM controller output, by PWM controller
The sawtooth signal of output is biased and reversely, generates the sawtooth signal of falling changed by zero and be transmitted to amplifier module 2；
The amplifier module 2 will the letter of falling sawtooth wave for receiving above-mentioned sawtooth signal and the target current signal
It number is overlapped with the target current signal, generates the current reference signal with slope compensation.
2. slope-error compensation circuit according to claim 1 for peak value comparison method BUCK converter, feature
It is, the error compensation sub-circuit includes the voltage acquisition module being sequentially connected in series, amplifier module 3；
The voltage acquisition module is believed the voltage signal by high pressure for acquiring the voltage signal of BUCK converter output
Number low-voltage control signal is converted to, and the low-voltage control signal is transmitted to amplifier module 3；
The amplifier module 3, for amplifying the low-voltage control signal received by presupposition multiple, and it is defeated to be converted into current signal
Out；The current signal of the output is the corresponding error compensating signal of the current reference signal with slope compensation.
3. slope-error compensation circuit according to claim 2 for peak value comparison method BUCK converter, feature
It is, the conditioning amplification sub-circuit includes reversed summing circuit；
The reversed summing circuit, for believing the current reference signal with slope compensation and the corresponding error compensation
It number sums up, obtains and exported for the current reference signal of peak value comparison method.
4. slope-error compensation circuit according to claim 3 for peak value comparison method BUCK converter, feature
It is, the amplifier module 1 includes operational amplifier A1, resistance R1~R4；
The negative input of the operational amplifier A1, the sawtooth signal I through resistance R1 and PWM controller outputslopeConnection,
It connect through resistance R2 with the bias voltage that DC power supply provides, and is connected through the output end of resistance R4 and A1；The positive input of A1
End is grounded through resistance R3.
5. slope-error compensation circuit according to claim 4 for peak value comparison method BUCK converter, feature
It is, the amplifier module 2 includes operational amplifier A2, resistance R5~R8；
The negative input of the operational amplifier A2 is connect, through resistance R5 with the output end of operational amplifier A1 through resistance R6
With target current signal IgConnection, and connected through the output end of resistance R8 and A2；The positive input of A2 is grounded through resistance R7.
6. slope-error compensation circuit according to claim 5 for peak value comparison method BUCK converter, feature
It is, the voltage acquisition module includes Hall voltage sensor LEM, resistance R9, R10；
The positive input of the Hall voltage sensor LEM is through resistance R9 and input signal UoutAnode connection, the negative sense of LEM
Input terminal and input signal UoutNegative terminal connection, the output end of LEM are grounded through resistance R10.
7. slope-error compensation circuit according to claim 6 for peak value comparison method BUCK converter, feature
It is, the amplifier module 3 includes operational amplifier A3, resistance R11~R13；
The negative input of the operational amplifier A3, the output end connection through resistance R11 and LEM, and through resistance R13 and A3
Output end connection；The positive input of A3 is grounded through resistance R12.
8. slope-error compensation circuit according to claim 7 for peak value comparison method BUCK converter, feature
It is, the reversed summing circuit includes operational amplifier A4, resistance R14~R17；
The negative input of the operational amplifier A4 is connect, through resistance with the output end of operational amplifier A3 through resistance R14
R16 is connect with the output end of operational amplifier A2, and is connected through the output end of resistance R17 and A4；The positive input of A4 is through electricity
Hinder R15 ground connection.
9. slope-error compensation circuit according to claim 8 for peak value comparison method BUCK converter, feature
It is, the amplification factor of operational amplifier A2 and A4 are 1, and the amplification factor of operational amplifier A1 and A3 are respectively as follows:
KA1=m/m3
In formula, m is slope compensation slope, m3For the I of falling sawtooth waveslope' slope, UinFor BUCK converter input voltage, KuFor
Voltage feedback factor, TsFor switch periods.
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|---|---|---|---|---|
| CN109149931B (en) * | 2018-08-29 | 2019-10-11 | 北京机械设备研究所 | Slope-error compensation circuit for peak value comparison method BUCK converter |
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