CN104836426B - A kind of second harmonic current compensator and its control method - Google Patents
A kind of second harmonic current compensator and its control method Download PDFInfo
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- CN104836426B CN104836426B CN201510309024.XA CN201510309024A CN104836426B CN 104836426 B CN104836426 B CN 104836426B CN 201510309024 A CN201510309024 A CN 201510309024A CN 104836426 B CN104836426 B CN 104836426B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
- H02M1/143—Arrangements for reducing ripples from dc input or output using compensating arrangements
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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 present invention proposes a kind of second harmonic current compensator and its control method.Second-harmonic compensation device is made up of main power circuit and its control circuit, wherein, main power circuit is made up of synchronous rectification Buck converters, input voltage sample circuit, output voltage sampling circuit and current sampling circuit, and control circuit includes single cycle controller, first adder, second adder, divider, multiplier, voltage regulator.Second harmonic current compensator is controlled using proposed monocycle control method, the control method is used as one circle control variable using the supervisor's current sampling signal and sample-offset voltage sum of synchronous rectification Buck converters, benchmark of second harmonic current, the output of voltage regulator and the reference offset voltage sum for absorbing or providing using needed for compensator as one circle control variable, compensator can be made reliablely and stablely to work, with good second harmonic current compensation effect, and compensation effect is not influenceed by operating mode.
Description
Technical field
The present invention relates to a kind of second harmonic current compensator, the compensator can be electric for absorbing pfc converter output
The second harmonic current in second harmonic current or offer input current of inverter in stream, belongs to Technics of Power Electronic Conversion and control
Technical field.
Background technology
Single-phase power factor correcting (PFC) converter and single-phase inverter are widely used in middle low power occasion, wherein
Single-phase PFC converter is to connect the electrical energy changer between input AC source and DC load, and single-phase inverter is then to connect
Connect direct current input source and AC load or the important interface of AC network.
For Single-phase PFC converter, its Instantaneous input power is pulsed with two times of input voltage frequencies, due to being output as putting down
Straight voltage, thus there is the pulsating current of two times of output voltage frequencies, i.e., so-called second harmonic current in its output current；
And for single-phase inverter, its instantaneous output is pulsed with two times of output voltage frequencies, because input is straight voltage,
Thus there is also second harmonic current in its input current.Second harmonic current is by the work to DC load or direct current input source
Performance has adverse effect on.If driving the second harmonic in LED, pfc converter output current using Single-phase PFC converter
Electric current will cause LED stroboscopics, and then human eye is damaged.If the input source of single-phase inverter is photovoltaic cell, inverter
Second harmonic current in input current oscillates around the power output for causing photovoltaic cell in maximum power point, reduces MPPT
Efficiency, and then reduce solar energy utilization rate.If the input source of single-phase inverter is fuel cell or battery, inverter
Second harmonic current in input current will reduce the energy conversion efficiency of battery, increases the caloric value of battery and shortens battery
Service life.Therefore, in order to reduce the adverse effect that second harmonic current is produced to DC loads such as LED, and photovoltaic electric is improved
The utilization ratio of other direct current input sources such as pond, fuel cell, battery is, it is necessary to suppress even to eliminate Single-phase PFC converter
With the second harmonic current in single-phase inverter.
For single stage type Single-phase PFC converter and single-phase inverter, the electricity of increase DC load side or direct current input source side
Have beneficial to reduction second harmonic current；, can also be by increase for two-stage type Single-phase PFC converter and single-phase inverter
Between the method for bus capacitor reduce second harmonic current.However, because required capacitance is generally larger, generally requiring choosing
With the higher electrochemical capacitor of energy storage density.But the service life of electrochemical capacitor only has thousands of hours, and with temperature rise and
Shorten, be to restrict transducer reliability and the main element of service life.
, can also be in DC load side, direct current input source side or intermediate dc in order to suppress and eliminate second harmonic current
A second harmonic current compensator in parallel on bus, is utilized to absorb the second harmonic electricity in pfc converter output current
Second harmonic current in stream or offer input current of inverter.Although being also required to an energy storage in second harmonic current compensator
Electric capacity, but the mains ripple at the storage capacitor two ends can suitably increase, so as to significantly reduce the capacity of storage capacitor, and then
The longer thin-film capacitor of service life replaces electrochemical capacitor as storage capacitor, thus improves the reliability of converter and uses
Life-span.
According to pfc converter and the power grade and input and output voltage size of inverter, second harmonic current compensation
Different circuit topologies may be selected in device.In order to obtain preferable second harmonic current compensation effect, the control method of compensator is extremely
Close important.Krein P etc. are in " Minimum energy and capacitance requirements for single-
phase inverters and rectifiers using a ripple port[J].IEEE Transactions on
Power Electronics,2012,27(11):4690-4698. " full-bridge inverter is used to be compensated as second harmonic current in
Device, has been derived when compensator provides the second harmonic current in input current of inverter completely, output storage capacitor voltage
Transient expression formula, and using this as storage capacitor voltage benchmark.So, as long as the control storage capacitor voltage-tracing voltage base
Standard can obtain preferable second harmonic current compensation effect.However, the amplitude and the power output of inverter of the voltage reference
Related to the amount of capacity of storage capacitor, the phase of voltage reference need to meet strict quantity with the phase of inverter output voltage
Relation, thus it is complex, it is necessary to the power output of calculating inverter, and to storage capacitor voltage in real time to obtain the voltage reference
Carry out lock phase control.At the same time, the amount of capacity of storage capacitor can change with environment temperature and the pressure-resistant of electric capacity two ends,
Thus the change of operating mode can influence the compensation effect of second harmonic current.Wang R and Wang F etc. is in " A high power
density single-phase PWM rectifier with active ripple energy storage[J].IEEE
Transactions on Power Electronics,2011,26(5):1430-1443. " used in and work in DCM patterns
Two-way Buck/boost converters have derived the dutycycle of switching tube with second harmonic electricity as second harmonic current compensator
Flow the changing rule of benchmark.So, the dutycycle of direct controlling switch pipe is changed by the rule being derived by, you can make compensation
Average value tracking second harmonic current benchmark of the input current of device in a switch periods.However, switching tube dutycycle
Changing rule is relevant with the inductance value of output inductor in compensator, and the inductance value of inductance can become with environment temperature and load current
Change and change, thus, the compensation effect of second harmonic current can be influenceed by environment temperature and load.In addition, compensator
The peak value and virtual value for working in electric current in DCM patterns, switching tube are higher, and the conduction loss of compensator is larger.Using similar
Control method, Cao X and Zhong Q etc. is in " Ripple eliminatorto smooth dc-bus voltage and
reduce the total capacitance required[J].IEEE Transactions on Industrial
Electronics,2015,62(4):2224-2235. " made in using the two-way Buck-boost converters for working in DCM patterns
For second harmonic current compensator, preferable second harmonic current compensation effect also obtain.But the benefit of second harmonic current
Repay effect is equally influenceed by environment temperature and load.Because load-side and storage capacitor side are non-DIRECT ENERGY transmission,
Thus the loss of compensator can be also increased slightly.
It is, thus, sought for a kind of Second-harmonic compensation device of new no electrolytic capacitor, has the compensator preferable
Second harmonic current compensation effect, and compensation effect do not influenceed by operating mode.In order to reduce compensator to pfc converter or inverse
Become the influence of device overall efficiency, the loss of compensator should also be as small as possible.
The content of the invention
, should the purpose of the present invention is to propose to a kind of no electrolytic capacitor second harmonic current compensator of use one circle control
Compensator can be for the second harmonic current absorbed in pfc converter output current or provide in input current of inverter two
Subharmonic current.
It is a further object of the present invention to provide a kind of monocycle control method.
A kind of second harmonic current compensator, the compensator is made up of main power circuit and its control circuit, wherein, main work(
Rate circuit includes synchronous rectification Buck converters, input voltage sample circuit, output voltage sampling circuit and current sample electricity
Road, the synchronous rectification Buck converters are made up of supervisor, auxiliary pipe, filter inductance and storage capacitor, it is characterized in that：
Control circuit to include single cycle controller, first adder, second adder, divider, multiplier and voltage to adjust
Save device；Described single cycle controller includes integrator, phase inverter, comparator and trigger；
Input voltage sample circuit and output voltage sampling circuit in main power circuit are respectively with controlling removing in circuit
Musical instruments used in a Buddhist or Taoist mass is connected with voltage regulator, and the current sampling circuit in main power circuit is connected with the first adder in control circuit
Connect, the supervisor of single cycle controller output and the drive signal of auxiliary pipe in synchronous rectification Buck converters respectively with being responsible for and auxiliary pipe
Grid be connected.
The further design of the present invention is：
First adder is by amplifier 1#, resistance R1、R2、R3And R4Composition, wherein, R1One end be connected to the anti-phase of amplifier 1#
Input, other end ground connection；R2One end be connected to amplifier 1# in-phase input end, the other end is connected in main power circuit
Current sampling circuit；R3One end be connected to amplifier 1# in-phase input end, the other end is connected to set in control circuit
Sample-offset voltage isbais；R4It is connected across between amplifier 1# inverting input and output end；First adder is output as list
Periodic Control variable, is connected to the input of integrator in single cycle controller.
Second adder is by amplifier 4#, resistance R9、R10、R11、R12And R13Composition, wherein, R9One end be connected to amplifier 4#
In-phase input end, the other end is connected to the output end of voltage regulator；R10One end be connected to amplifier 4# in-phase input end,
The other end is connected to the second harmonic current benchmark i for absorbing or providing needed for the compensator set in control circuitSHC；R11One
End is connected to amplifier 4# in-phase input end, and the other end is connected to multiplier Mul2 output end；R12One end be connected to amplifier
4# inverting input, other end ground connection；R13It is connected across between amplifier 4# inverting input and output end；Second adder
The benchmark of one circle control variable is output as, the input of comparator in single cycle controller is connected to.
Divider is by amplifier 2#, multiplier Mul1 and Mul3 and resistance R5And R6Composition, wherein, a Mul1 input
End is connected with amplifier 2# output end, and another input is connected to the input voltage sample circuit in main power circuit, defeated
Go out end and R6It is connected in series, R6The other end be connected to amplifier 2# inverting input, R5One end be connected to the anti-phase of amplifier 2#
Input, the other end is connected to -1V benchmark, and a Mul3 input is connected to amplifier 2# output end, another input
It is connected to the output voltage sampling circuit in main power circuit, output signal (calculating obtained dutycycle in real time) access multiplier
A Mul2 input, Mul2 another input is connected to the R in first adder3, output reference bias voltage
irbaisIt is connected to the resistance R of second adder11。
Voltage regulator is by amplifier 3#, resistance R7And R8And electric capacity C1Composition, wherein R7One end be connected to amplifier 3#'s
Inverting input, the other end is connected to the output voltage sampling circuit in main power circuit, resistance R8With electric capacity C1After series connection and connect
Between amplifier 3# inverting input and output end, amplifier 3# in-phase input end and the output voltage set in control circuit
Reference signal vrefIt is connected, the output end of voltage regulator is connected to the resistance R of second adder9。
Storage capacitor uses thin-film capacitor, and there is larger mains ripple at its two ends.The value V of storage capacitorCsWith energy storage electricity
Hold the maximum V of voltageCs_max, storage capacitor voltage pulsation size △ vCs, the second harmonic that absorbs or provide needed for compensator
The frequency f of electric current2ndAnd the pulsating power P of required absorption or offerSHCRelevant (f2ndAnd PSHCIt is previously given), and meet as follows
Relational expression：
Take and determine VCs_maxWith △ vCs, then the f that will be given2ndAnd PSHCSubstitute into above formula, you can obtain the value of storage capacitor.Note
Meaning,
The design of filter inductance is different from conventional design, in addition to the pulsation size that need to limit inductive current, also needs consideration two
The ability of tracking of subharmonic current.The lower limit value L of filter inductancesDetermined by filter inductance pulsation of current size, its expression formula
For
The upper limit value of filter inductance is determined that its expression formula is by the ability of tracking of second harmonic current
V in formulabusIt is the input voltage of compensator, vCsIt is storage capacitor electric capacity, fsFor the switching frequency of compensator, PSHCFor
The pulsating power for absorbing or providing needed for compensator, iLs_SHCIt is the second harmonic current component in filter inductance, i'Ls_SHC(t)
For iLs_SHC(t) derived function.
The synchronous rectification Buck converters work in CCM patterns, by supervisor, auxiliary pipe, filter inductance and energy capacitance set
Into, wherein, supervisor is connected to the input voltage positive pole and filter inductance L of compensatorsBetween, auxiliary pipe be connected to supervisor source electrode and
Between the negative pole of input voltage, storage capacitor CsIt is connected to filter inductance LsBetween the negative pole of input voltage；The input voltage
Sample circuit is parallel between the input both positive and negative polarity of compensator；The output voltage sampling circuit is parallel to storage capacitor two ends；
The current sampling circuit is series in supervisor's current loop.
Described voltage regulator use the double zero point types compensation networks of proportional-integral controller, duopole or ratio-
Integral controller cascade bandreject filtering type compensation network.It is by the output voltage sampled signal of compensator and output electricity that it, which is acted on,
Pressure benchmark compares, and the error signal for comparing generation is amplified, output to second adder.Output voltage benchmark both can be
The average value benchmark of output voltage, can also be the maximum benchmark of output voltage.Compared to the average value of control output voltage,
The DIRECT ENERGY transmission proportion of input and output side when the maximum of control output voltage can improve the work of compensator underloading, can be with
Reduce the underloading loss of compensator, but now need to add peak detection circuit in control circuit.The peak detection circuit bag
Include detection resistance Rp, detection electric capacity CpWith diode Dp, wherein, RpAnd CpIt is connected in parallel, its one end is connected to resistance R7, the other end
It is connected to the ground；Diode DpAnode be connected to output voltage sampling circuit in main power circuit, negative electrode is connected to resistance R7。
Suitable for the monocycle control method of second harmonic current compensator, comprise the following steps：
Supervisor in a, response single cycle controller in the rising edge of clock, synchronous rectification Buck converters is open-minded, auxiliary pipe
Shut-off；
Current sampling circuit sampling supervisor's current signal in b, main power circuit, and configure a constant sample-offset
Voltage, makes sum of the two is permanent in full-load range to be more than 0, and regard sum of the two as one circle control variable；
C, divider calculate the dutycycle of compensator supervisor in real time, and it is passed through into multiplier and above-mentioned constant sample-offset
Voltage is multiplied, and obtains a reference offset voltage；
D, second harmonic current benchmark, the voltage regulator that will be absorbed or provide needed for compensator using second adder
Output and described reference offset voltage are added, and obtain the benchmark of one circle control variable；
Integrator in e, single cycle controller is integrated to described one circle control variable, when integrated value with it is described
One circle control variable benchmark it is equal when, the output state flip of comparator in single cycle controller, trigger reset, together
Supervisor's shut-off of rectification Buck converters is walked, auxiliary pipe is open-minded, until next clock arrives in single cycle controller, compensation is thought highly of
Multiple above-mentioned steps work.
Because integrated value of the above-mentioned sample-offset voltage in a switch periods is equal with reference offset voltage, and voltage
The output of adjuster is approximately 0, therefore integrated value of supervisor's electric current in a switch periods, that is, is responsible for electric current a switch week
Average value in phase is equal to the second harmonic current for absorbing or providing needed for compensator.So, using list proposed by the invention
Cycle control methods, can make compensator have preferable second harmonic current compensation effect.
The second harmonic current compensator that the present invention is designed, can be connected in parallel on DC load side, direct current input source side or in
Between on dc bus, for absorbing the second harmonic current in pfc converter output current or providing in input current of inverter
Second harmonic current.
Compared with prior art, its main feature is as follows by the present invention：
1. the peak value and virtual value that compensator proposed by the invention works in electric current in CCM patterns, switching tube are relatively low, mend
The conduction loss for repaying device is smaller；
2. the second harmonic current compensator that the present invention is designed is designed using no electrolytic capacitor, the compensator has good
Second harmonic current compensation effect, and operating mode influences very little to compensation effect.
3. monocycle control method proposed by the invention can overcome existing basic monocycle control method because in compensation
When device works in discharge mode to inductive current disturb do not restrain and cause compensator can not steady operation defect so that compensation
Device can reliablely and stablely work under charge mode and discharge mode.
Brief description of the drawings
Accompanying drawing 1 is the schematic diagram of synchronous rectification Buck converters in the present invention.
2 points of accompanying drawing is accompanying drawing 2-1,2-2,2-3 and 2-4, is synchronous rectification Buck converters under different working modes
Equivalent circuit diagram.
Accompanying drawing 2-1 is that synchronous rectification Buck converters work in charge mode, equivalent electric when supervisor is opened, auxiliary pipe is turned off
Lu Tu；
Accompanying drawing 2-2 is that synchronous rectification Buck converters work in charge mode, equivalent electric when supervisor is turned off, auxiliary pipe is opened
Lu Tu；
Accompanying drawing 2-3 is that synchronous rectification Buck converters work in discharge mode, equivalent electric when supervisor is opened, auxiliary pipe is turned off
Lu Tu；
Accompanying drawing 2-4 is that synchronous rectification Buck converters work in discharge mode, equivalent electric when supervisor is turned off, auxiliary pipe is opened
Lu Tu.
Solid line in accompanying drawing 2-1,2-2,2-3 and 2-4 represents have electric current to flow through under the operation mode, and dotted line represents the work
No current flows through under mode.
3 points of accompanying drawing is accompanying drawing 3-1,3-2, is second harmonic current when being controlled using basic monocycle control method
Key operation waveforms of the compensator under different working modes.
Accompanying drawing 3-1 is that when being controlled using basic monocycle control method, second harmonic current compensator is in charging mould
Key operation waveforms under formula；
Accompanying drawing 3-2 is that when being controlled using basic monocycle control method, second harmonic current compensator is in electric discharge mould
Key operation waveforms under formula.
Solid line in accompanying drawing 3-1,3-2 is the steady operation waveform of compensator, and dotted line is that disturbance is added in inductive current
Work wave afterwards.
4 points of accompanying drawing is accompanying drawing 4-1,4-2, is when being controlled using monocycle control method proposed by the invention two
Key operation waveforms of the subharmonic current compensator under different working modes.
Accompanying drawing 4-1 is that when being controlled using monocycle control method, second harmonic current compensator is under charge mode
Key operation waveforms；
Accompanying drawing 4-2 is that when being controlled using monocycle control method, second harmonic current compensator is under discharge mode
Key operation waveforms.
Solid line in accompanying drawing 4-1,4-2 is the steady operation waveform of compensator, and dotted line is that disturbance is added in inductive current
Work wave afterwards.
Accompanying drawing 5 is the schematic diagram of control circuit in second harmonic current compensator, and the output voltage of wherein storage capacitor is adopted
Use average value control.
When accompanying drawing 6 is that output voltage is controlled using average value, the work wave of storage capacitor voltage under different loads.
When accompanying drawing 7 is that output voltage uses Maximum constraint, the work wave of storage capacitor voltage under different loads.
Accompanying drawing 8 is another schematic diagram of control circuit in this second harmonic current compensator, and wherein storage capacitor is defeated
Go out voltage and use Maximum constraint.
Accompanying drawing 9 is the circuit theory diagrams for designing example.
Accompanying drawing 10-1,10-2,10-3 and 10-4, simulation waveform when being second harmonic current compensator steady operation, its
Middle output voltage uses average value control.
Accompanying drawing 10-1 is compensator when 10% carries work, second harmonic current benchmark iSHC, compensator actual absorption or carry
The second harmonic current i of confessionQa1_SHC, margin of error err and storage capacitor voltage vCsSimulation waveform；
Accompanying drawing 10-2 is compensator when 10% carries work, reflects the simulation waveform of one circle control circuit operating characteristic；
Accompanying drawing 10-3 is compensator in fully loaded work, second harmonic current benchmark iSHC, compensator actual absorption or offer
Second harmonic current iQa1_SHC, margin of error err and storage capacitor voltage vCsSimulation waveform；
Accompanying drawing 10-4 is compensator in fully loaded work, reflects the simulation waveform of one circle control circuit operating characteristic.
Accompanying drawing 11-1,11-2,11-3 and 11-4, simulation waveform when being second harmonic current compensator steady operation, its
Middle output voltage uses Maximum constraint.
Accompanying drawing 11-1 is compensator when 10% carries work, second harmonic current benchmark iSHC, compensator actual absorption or carry
The second harmonic current i of confessionQa1_SHC, margin of error err and storage capacitor voltage vCsSimulation waveform；
Accompanying drawing 11-2 is compensator when 10% carries work, reflects the simulation waveform of one circle control circuit operating characteristic；
Accompanying drawing 11-3 is compensator in fully loaded work, second harmonic current benchmark iSHC, compensator actual absorption or offer
Second harmonic current iQa1_SHC, margin of error err and storage capacitor voltage vCsSimulation waveform；
Accompanying drawing 11-4 is compensator in fully loaded work, reflects the simulation waveform of one circle control circuit operating characteristic.
Accompanying drawing 12-1,12-2,12-3 and 12-4, are the application examples of second harmonic current compensator.
Accompanying drawing 12-1 is the direct current input side that compensator is parallel to single stage type single-phase inverter；
Accompanying drawing 12-2 is the intermediate dc bus two ends that compensator is parallel to two-stage type single-phase inverter；
Accompanying drawing 12-3 is the DC output side that compensator is parallel to single stage type Single-phase PFC converter；
Accompanying drawing 12-4 is the intermediate dc bus two ends that compensator is parallel to two-stage type Single-phase PFC converter.
Primary symbols title in above-mentioned accompanying drawing：Qa1It is the supervisor of compensator, Qa2It is the auxiliary pipe of compensator, LsFor filtered electrical
Sense, CsFor storage capacitor, vbusAnd vCsIt is input and the output voltage of compensator, v respectivelyCs_min、vCs_aveAnd vCs_maxIt is respectively
Minimum value, average value and the maximum of output voltage, △ vCsIt is the pulsation size of storage capacitor voltage, vbus_fbAnd vCs_fbRespectively
It is the sampled signal of input and output voltage, iQa1And iQa2It is the electric current of supervisor and auxiliary pipe, i respectivelyQa1_fbIt is to be responsible for adopting for electric current
Sample signal, iQa1_SHCIt is the second harmonic current component being responsible in electric current, clk is the clock signal in single cycle controller, iint
For the output voltage of phase inverter in single cycle controller, isbaisAnd irbaisRespectively sample-offset voltage and reference offset voltage,
irefFor the benchmark of one circle control variable in existing basic monocycle control method, i'refFor the monocycle proposed by the present invention
The benchmark of one circle control variable, v in control methodref_aveAnd vref_maxThe respectively average value benchmark and maximum of output voltage
It is worth benchmark, iSHCThe second harmonic current benchmark for absorbing or providing for needed for compensator, ierrIt is iSHCAnd iQa1_SHCResidual quantity, R1、
R2、R3And R4It is the resistance for constituting adder (1), R5And R6It is the resistance for constituting divider, R7、R8It is composition voltage regulator
Resistance, C1It is the electric capacity for constituting voltage regulator, R9、R10、R11、R12And R13It is the resistance for constituting adder (2), R14And R15It is
Constitute the resistance of phase inverter, RintIt is the input resistance of integrator, CintIt is the feedback capacity of integrator, RpIt is peakvalue's checking electricity
Resistance, CpIt is peakvalue's checking electric capacity, Rsv1And Rsv2It is input voltage sampling resistor, Rsv3And Rsv4It is output voltage sampling resistor, Rsi
It is the sampling resistor for being responsible for electric current.
Embodiment
Embodiment one：
The main power circuit that accompanying drawing 1 gives no electrolytic capacitor second harmonic current compensator proposed by the invention is opened up
Flutter.It uses the Buck converters of synchronous rectification, by switching tube Qa1、Qa2, filter inductance LsWith storage capacitor CsComposition.Wherein,
Switching tube Qa1It is supervisor, is connected to the input voltage positive pole and filter inductance L of compensatorsBetween；Switching tube Qa2It is auxiliary pipe, connection
In Qa1Source electrode and input voltage negative pole between；Storage capacitor CsIt is connected to filter inductance LsWith the negative pole of input voltage it
Between, its electric capacity species is long-life thin-film capacitor., can be by compensator according to the changing rule of storage capacitor both end voltage
Mode of operation is divided into charge mode and discharge mode.When compensator works in charge mode, the voltage liter at storage capacitor two ends
It is high；When compensator works in discharge mode, the voltage at storage capacitor two ends declines.
When accompanying drawing 2-1 and 2-2 give charge mode work, equivalent circuit diagram of the compensator under different operating mode.
As supervisor Qa1It is open-minded, auxiliary pipe Qa2During shut-off, iQa1>0, inductive current forward direction is linearly increasing；As supervisor Qa1Shut-off, auxiliary pipe Qa2Conducting
When, inductive current passes through auxiliary pipe Qa2Afterflow, positive linear reduction.
When accompanying drawing 2-3 and 2-4 give discharge mode work, equivalent circuit diagram of the compensator under different operating mode.
As supervisor Qa1It is open-minded, auxiliary pipe Qa2During shut-off, iQa1<0, inductive current negative sense linearly reduces；As supervisor Qa1Shut-off, auxiliary pipe Qa2Conducting
When, storage capacitor gives inductance LsCharging, inductive current negative sense is linearly increasing.
Embodiment two：(existing control method is compared with control method of the present invention)
Fig. 3-1,3-2 gives compensator using key operation waveforms during existing basic monocycle control method, figure
Solid line is the work wave under steady-state working condition in 3-1,3-2, and dotted line is that operating wave after disturbance is added in inductive current
Shape.From the figure 3, it may be seen that during charge mode (accompanying drawing 3-1), compensator is disturbed to inductive current restrains, can be with steady operation.This be because
For when inductive current forward direction increase (or reduce), iQa1It is positive therewith to increase (or reduction), iQa1_fb'sIntegrated value iintWill be in advance
(or delayed) reaches benchmark irefSo that supervisor Qa1Dutycycle reduce (or increase), auxiliary pipe Qa2Dutycycle increase (or subtract
It is small).Because inductive current passes through auxiliary pipe Qa2Time of afterflow increase (or reduce), thus inductive current will reduce (or increase).
After several switch periods, inductive current will be restored to stable state.And during discharge mode (accompanying drawing 3-2), compensator pair
Inductive current disturbance diverging, it is impossible to steady operation.Because when the increase of inductive current negative sense (or reduction), iQa1Bear therewith
To increase (or reduction), iQa1_fbIntegrated value iint(or delayed) benchmark i will be reached in advancerefSo that supervisor Qa1Dutycycle subtract
Small (or increase), auxiliary pipe Qa2Dutycycle increase (or reduce), cause storage capacitor to give inductance LsCharging interval increase (or subtract
It is few) so that inductive current further increases (or reduction), a positive feedback process is formed, until under storage capacitor voltage
0 is dropped to, compensator reenters charge mode.
In order that compensator can in discharge mode steady operation, the monocycle control method that proposes of the present invention, this
The sampled signal i of the method for kind not directly to be responsible for electric currentQa1_fbAs one circle control variable, but in the sampling of supervisor's electric current
Signal iQa1_fbOne sample-offset voltage i of middle superpositionsbaisAfterwards, then with (iQa1_fb+isbais) it is used as one circle control variable.Note
Meaning, sample-offset voltage isbais(i should be causedQa1_fb+isbais) permanent more than 0 in full-load range.So, when compensator works
When discharge mode, if inductive current negative sense increase (or reduction), (iQa1_fb+isbais) reduce forward direction (or increase) so that
It is responsible for Qa1Dutycycle increase (or reduce), auxiliary pipe Qa2Dutycycle reduce (or increase), cause storage capacitor to give inductance LsFill
The time of electricity reduces (or increase), so that inductive current reduces (or increase).After several switch periods, inductive current
Stable state will be restored to.
Accompanying drawing 4-1,4-2 give compensator using key operation waveforms during monocycle control method of the present invention, in figure
Solid line is the work wave under steady-state working condition, and dotted line is that work wave after disturbance is added in inductive current.Can by Fig. 4
Know, using monocycle control method proposed by the invention, compensator can stablize work under charge mode and discharge mode
Make.As can be seen here, the monocycle control method proposed is creative and practical value.
With reference to the accompanying drawings 3 and accompanying drawing 4, iQa1_fb(iQa1_fb+isbais) integrated value in a switch periods should expire respectively
Foot
Wherein, irefThe second harmonic current i for absorbing or providing for needed for compensatorSHCWith the output v of voltage regulatorGvIt
With.V during due to steady operatione≈ 0, thus have
iref=iSHC+ve≈iSHC (3)
It can be obtained by formula (1)~(3)
From formula (4), the monocycle control method of use, compensator supervisor's electric current being averaged in a switch periods
Value is equal to the required second harmonic current for absorbing or providing, thus compensator has preferable second harmonic current compensation effect.
From formula (5), compared to basic monocycle control method, the one circle control variable base of monocycle control method
Need to be superimposed a reference offset voltage i related with sample-offset voltage to compensator dutycycle in standardrbais。
For the synchronous rectifier Buck converters shown in accompanying drawing 1, dutycycle dyFor
Therefore reference offset voltage irbaisFor
Embodiment three：
Accompanying drawing 5 gives the control circuit theory diagrams of monocycle control method of the present invention.From accompanying drawing 5, control electricity
Road includes single cycle controller, first adder, second adder, divider, multiplier and voltage regulator, specific connection
Mode is：First adder is by amplifier 1#, resistance R1、R2、R3And R4Composition, wherein, R1One end be connected to the anti-phase of amplifier 1#
Input, other end ground connection；R2One end be connected to amplifier 1# in-phase input end, the other end is connected in main power circuit
Current sampling circuit；R3One end be connected to amplifier 1# in-phase input end, the other end is connected to sample-offset voltage isbais；R4
It is connected across between amplifier 1# inverting input and output end；First adder is output as one circle control variable, is connected to
The input of integrator in single cycle controller；Divider is by amplifier 2#, multiplier Mul1 and Mul3 and resistance R5And R6Group
Into, wherein, a Mul1 input is connected with amplifier 2# output end, and another input is connected in main power circuit
Input voltage sample circuit, output end and R6It is connected in series, R6The other end be connected to amplifier 2# inverting input, R5's
One end is connected to amplifier 2# inverting input, and the other end is connected to -1V benchmark, and a Mul3 input is connected to amplifier 2#
Output end, another input is connected to the output voltage sampling circuit in main power circuit, and output calculates what is obtained in real time
Dutycycle is to a multiplier Mul2 input, and Mul2 another input is connected to the R in first adder3, output
Reference offset voltage irbaisIt is connected to R11；Voltage regulator is by amplifier 3#, resistance R7And R8And electric capacity C1Composition, wherein R7's
One end is connected to amplifier 3# inverting input, and the other end is connected to the output voltage sampling circuit in main power circuit, resistance
R8With electric capacity C1It is connected to after series connection between amplifier 3# inverting input and output end, amplifier 3# in-phase input end and output
The benchmark v of voltagerefIt is connected, the output end of voltage regulator is connected to R9；Second adder is by amplifier 4#, resistance R9、R10、R11、
R12And R13Composition, wherein, R9One end be connected to amplifier 4# in-phase input end, the other end is connected to the output of voltage regulator
End；R10One end be connected to amplifier 4# in-phase input end, the other end is connected to absorb needed for compensator or provide secondary humorous
Ripple current reference iSHC；R11One end be connected to amplifier 4# in-phase input end, the other end is connected to multiplier Mul2 output
End；R12One end be connected to amplifier 4# inverting input, other end ground connection；R13Be connected across amplifier 4# inverting input and
Between output end；Second adder is output as the benchmark of one circle control variable, is connected to comparator in single cycle controller
Input；Single cycle controller output synchronous rectification Buck converters supervisor and the drive signal of auxiliary pipe, be connected to supervisor and
The grid of auxiliary pipe, control supervisor and auxiliary pipe being opened and turn off.
In figure 5, the voltage reference for being connected to voltage regulator in-phase input end is the average value benchmark of output voltage,
Therefore, adjusted by closed loop, the average value of compensator output voltage keeps constant in full-load range, as shown in Figure 6.But
It should be noted that to ensure synchronous rectification Buck converter normal works, the maximum of storage capacitor voltage have to be lower than benefit
Repay the input voltage of device.And when the timing of output voltage average value one, as power output is raised, storage capacitor mains ripple becomes
Greatly, the maximum of output voltage is uprised.When fully loaded work, the maximum of compensator output voltage reaches highest, thus, compensation
The average value of device output voltage need to be designed according to full-loading condition.But on the other hand, identical output voltage average value condition
Under, when underloading works, storage capacitor mains ripple is smaller, and the input of compensator differs larger with output voltage so that input is defeated
The DIRECT ENERGY transmission proportion for going out side declines, and then is lost when causing compensator underloading to work larger.
If directly controlling the maximum of output voltage, the average value of compensator output voltage can drop with power output
It is low and adaptively improve, the DIRECT ENERGY transmission proportion of compensator input and output side when can so improve underloading work, so that
Reduce the loss of compensator.
Example IV：
When accompanying drawing 7 gives output voltage using Maximum constraint, the operating wave of storage capacitor voltage under different loads
Shape, storage capacitor voltage waveform when figure chain lines are underloading work, storage capacitor voltage wave when solid line is fully loaded work
Shape.From accompanying drawing 7, in full-load range, the maximum of output voltage keeps constant, and the average value of output voltage is with negative
Carry and mitigate and raise.
When accompanying drawing 8 is given using output voltage Maximum constraint, the control circuit theory diagrams of monocycle control method.With
Accompanying drawing 5 is compared, and its main distinction is the control circuit also comprising a peak detection circuit.The circuit includes diode Dp, inspection
Measuring resistance RpWith detection electric capacity Cp, its input is connected to the output voltage sampling circuit in main power circuit, and output end is connected to
Resistance R in voltage regulator7, the connected mode of control circuit portions is identical with accompanying drawing 5 in accompanying drawing 8.
Embodiment five：
Accompanying drawing 9 gives the present invention circuit theory diagrams of design example, and main power circuit also includes compared with accompanying drawing 1 in figure
By Rsv1And Rsv2The input voltage sample circuit of composition, by Rsv3And Rsv4The output voltage sampling circuit and supervisor's electric current of composition
Sampling resistor Rsi, wherein, series resistance Rsv1And Rsv2It is connected to the input of synchronous rectification Buck converters, series resistance
Rsv3And Rsv4It is connected to the output end of synchronous rectification Buck converters, resistance RsiIt is series at compensator input negative pole and auxiliary pipe source electrode
Between.The input voltage sampled signal that input voltage sample circuit is obtained is connected to the input of Mul1 in divider, output electricity
The output voltage sampled signal that pressure sample circuit is obtained is respectively connecting to Mul3 input and diode D in dividerpSun
Pole, supervisor's current sampling resistor RsiObtained supervisor's current sampling signal is connected to R in first adder2；Circuit is controlled in figure
Connected mode it is identical with accompanying drawing 8.
Storage capacitor C in accompanying drawing 9sDesign method it is as follows：
Storage capacitor CsUsing thin-film capacitor, there is larger capacitance voltage pulsation at its two ends.CsCapacitance and storage capacitor electricity
The maximum V of pressureCs_max, storage capacitor voltage pulsation size △ vCs, second harmonic current frequency f2ndAnd required absorption
Or the pulsating power P providedSHCBetween (f2ndAnd PSHCIt is previously given) meet following relation
Take the maximum of storage capacitor voltage and pulsation size when being fully loaded with work surely, you can calculate and stored up according to formula (8)
Can electric capacity CsCapacitance.Note,
Filter inductance L in accompanying drawing 9sDesign method it is as follows：
Filter inductance LsIn second harmonic current component iLs_SHCAnd iSHCBetween meet：
I in formulaSHCAnd v (t)Cs(t) expression formula is respectively
Filter inductance LsValue lower limit be：
Filter inductance LsThe value upper limit be：
I' in formulaLs_SHC(t) it is iLs_SHC(t) derived function, can be obtained, i by formula (9) and formula (10)Ls_SHC(t) expression formula
For
The input resistance R of integrator in accompanying drawing 9intWith feedback capacity CintDesign method it is as follows：
RintAnd CintProduct should meet：
F in formulasFor the switching frequency of compensator.Typically take Cint=100pF, so, takes and determines fsIt can determine that RintTake
Value.
The design principle of voltage regulator is as follows in accompanying drawing 9：
Voltage regulator should be in the frequency f corresponding to second harmonic current2ndPlace has alap gain, to filter out
Second harmonic current component in output voltage sampled signal, so as to ensure that there is compensator preferable second harmonic current to suppress
Effect.Typically desirable C1=1 μ F, R7=10k Ω, R8=1k Ω.
The gain of adder (1) is 1 in accompanying drawing 9, and R is taken during design1=R2=R3=R4In=R, formula R typically take 1k~
10k。
The gain of divider is 1 in accompanying drawing 9, and R is taken during design5=R6=R.
The gain of adder (2) is 1 in accompanying drawing 9, and R is taken during design9=R10=R11=R12=R, R13=2R.
The gain of phase inverter is 1 in accompanying drawing 9, and R is taken during design14=R15=R.
Detection resistance R in accompanying drawing 9 in peak detection circuitpWith detection electric capacity CpDesign principle be：RpCp>(3~5)/
f2nd, f2ndFor the frequency of second harmonic current.
The major parameter of instantiation given by accompanying drawing 9 is as follows：
● input voltage vbus=400V
● the maximum V of output voltageCs_max=380V
● filter inductance Ls=2mH
● storage capacitor Cs=100 μ F
● the switching frequency f of second harmonic current compensators=100kHz
● required absorption or the pulsating power P providedSHC=1kVA
● the frequency f of second harmonic current2nd=100Hz
● composition adder (1) circuit parameter be：R1=R2=R3=R4=1k Ω
● composition is unless the circuit parameter of device is：R5=R6=1k Ω
● composition voltage regulator circuit parameter be：R7=10k Ω, R8=1k Ω, C1=1 μ F
● composition adder (2) circuit parameter be：R9=R10=R11=R12=1k Ω, R13=2k Ω
● composition integrator circuit parameter be：Rint=100k Ω, Cint=100pF
● composition phase inverter circuit parameter be：R14=R15=1k Ω
Composition peak detector circuit parameter be：Rp=51k Ω, Cp=10 μ F
Test case one：
Accompanying drawing 10 gives second harmonic current design of Compensator example (respective figure 9) of the present invention
Steady operation when simulation waveform, wherein output voltage uses average value control.Accompanying drawing 10-1 and accompanying drawing
10-2 is simulation waveform of the compensator when 10% carries work, and accompanying drawing 10-3 and 10-4 are emulation of the compensator in fully loaded work
Waveform.It can be seen from accompanying drawing 10-1 and 10-3 when output voltage is controlled using average value, the average value of storage capacitor voltage
Do not change with load and change, the second harmonic electricity that the input current of compensator absorbs or provided needed for can tracking well
Stream.It can be seen from accompanying drawing 10-2 and accompanying drawing 10-4 compensator under charge mode and discharge mode can with steady operation, by
This shows that the monocycle control method of the present invention has feasibility and validity.
Test case two：
When accompanying drawing 11 gives the steady operation of second harmonic current design of Compensator example (respective figure 9) of the present invention
Simulation waveform, wherein output voltage use Maximum constraint.Accompanying drawing 11-1 and accompanying drawing 11-2 are that compensator carries work 10%
Simulation waveform when making, accompanying drawing 11-3 and 11-4 are simulation waveform of the compensator in fully loaded work.By accompanying drawing 11-1 and 11-3
As can be seen that when output voltage uses Maximum constraint, the maximum of storage capacitor voltage does not change and changed with load, mends
The required second harmonic current for absorbing or providing can be tracked well by repaying the input current of device.By accompanying drawing 11-2 and accompanying drawing 11-4
Again it can be seen that compensator can be with steady operation under charge mode and discharge mode, the one circle control being indicated above
Method has feasibility and validity.
Application example：
Accompanying drawing 12 gives the application example of second harmonic current compensator proposed by the invention.It can both be parallel to
The direct current input side (accompanying drawing 12-1) of single stage type single-phase inverter or the intermediate dc bus two ends of two-stage type single-phase inverter are (attached
Figure 12-2), for providing the second harmonic current in input current of inverter；The conversion of single stage type Single-phase PFC can also be parallel to
The DC output side (accompanying drawing 12-3) of device or the intermediate dc bus two ends (accompanying drawing 12-4) of two-stage type Single-phase PFC converter, are used
To absorb the second harmonic current in pfc converter output current.
As seen from the above description, no electrolytic capacitor second harmonic current compensator proposed by the present invention has the following advantages that：
1. no electrolytic capacitor in compensator；
2. the peak value and virtual value that compensator works in electric current in CCM patterns, switching tube are relatively low, the conduction loss of compensator
It is smaller；
3. the monocycle control method that compensator is used is controlled, basic monocycle control method is overcome because in electric discharge
Pattern does not restrain to inductive current disturbance and causes the unstable defect of compensator, ensure that compensator in charge mode and puts
Reliablely and stablely worked under power mode；
4. compensator has good second harmonic current compensation effect, and operating mode influences very little to compensation effect.
Claims (10)
1. a kind of second harmonic current compensator, the compensator is made up of main power circuit and its control circuit, wherein, main power
Circuit includes synchronous rectification Buck converters, input voltage sample circuit, output voltage sampling circuit and current sampling circuit,
The synchronous rectification Buck converters are made up of supervisor, auxiliary pipe, filter inductance and storage capacitor, it is characterized in that：
Control circuit to include single cycle controller, first adder, second adder, divider, multiplier Mul2 and voltage to adjust
Save device；Described single cycle controller includes integrator, phase inverter, comparator and trigger；
Wherein, two inputs of first adder are connected in the current sampling circuit and control circuit in main power circuit respectively
Set sample-offset voltage isbias, the input for exporting the integrator in connection single cycle controller of first adder；
Three inputs of second adder connect multiplier Mul2 output end, the output end of voltage regulator and second harmonic respectively
Current reference iSHC, second adder output end connection single cycle controller in comparator input；Two of divider
Input connects input voltage sample circuit and output voltage sampling circuit in main power circuit, output end connection multiplication respectively
Device Mul2 input；Multiplier Mul2 two inputs connect the output end and sample-offset voltage of divider respectively
isbias；The input connection output voltage sampling circuit of voltage regulator, one of them of output end connection second adder is defeated
Enter end；
Current sampling circuit in main power circuit is connected with the first adder in control circuit, single cycle controller output
Supervisor and the drive signal of auxiliary pipe be responsible for respectively with synchronous rectification Buck converters and the grid of auxiliary pipe is connected.
2. second harmonic current compensator according to claim 1, it is characterized in that：
First adder is by amplifier 1#, resistance R1、R2、R3And R4Composition, wherein, R1One end be connected to amplifier 1# anti-phase input
End, other end ground connection；R2One end be connected to amplifier 1# in-phase input end, the other end is connected to the electric current in main power circuit
Sample circuit；R3One end be connected to amplifier 1# in-phase input end, the other end is connected to sampling set in control circuit
Bias voltage isbais；R4It is connected across between amplifier 1# inverting input and output end；First adder is output as the monocycle
Variable is controlled, the input of integrator in single cycle controller is connected to.
3. second harmonic current compensator according to claim 1 or claim 2, it is characterized in that：
Second adder is by amplifier 4#, resistance R9、R10、R11、R12And R13Composition, wherein, R9One end be connected to the same of amplifier 4#
Phase input, the other end is connected to the output end of voltage regulator；R10One end be connected to amplifier 4# in-phase input end, it is another
End is connected to the second harmonic current benchmark i for absorbing or providing needed for the compensator set in control circuitSHC；R11One end connect
Amplifier 4# in-phase input end is connected to, the other end is connected to multiplier Mul2 output end；R12One end be connected to amplifier 4#'s
Inverting input, other end ground connection；R13It is connected across between amplifier 4# inverting input and output end；The output of second adder
For the benchmark of one circle control variable, the input of comparator in single cycle controller is connected to.
4. second harmonic current compensator according to claim 3, it is characterized in that：Divider is by amplifier 2#, multiplier Mul1
With Mul3 and resistance R5And R6Composition, wherein, a Mul1 input is connected with amplifier 2# output end, and another is defeated
Enter the input voltage sample circuit that end is connected in main power circuit, output end and R6It is connected in series, R6The other end be connected to fortune
Put 2# inverting input, R5One end be connected to amplifier 2# inverting input, the other end is connected to -1V benchmark, Mul3's
One input is connected to amplifier 2# output end, and another input is connected to the output voltage sampling electricity in main power circuit
Road, an output signal access multiplier Mul2 input, Mul2 another input is connected in first adder
R3, output reference bias voltage irbaisIt is connected to the resistance R of second adder11The other end.
5. second harmonic current compensator according to claim 3, it is characterized in that：
Voltage regulator is by amplifier 3#, resistance R7And R8And electric capacity C1Composition, wherein R7Right-hand member be connected to the anti-phase of amplifier 3#
Input, left end is connected to the output voltage sampling circuit in main power circuit, resistance R8With electric capacity C1Amplifier is connected to after series connection
Between 3# inverting input and output end, amplifier 3# in-phase input end and the benchmark of the output voltage set in control circuit
Signal vrefIt is connected, the output end of voltage regulator is connected to the resistance R of second adder9；The output electricity set in control circuit
Press reference signal vrefThe maximum reference signal of average value reference signal or output voltage for output voltage, when electric to export
, it is necessary to add peak detection circuit in control circuit, the peak detection circuit includes detection during the maximum reference signal of pressure
Resistance Rp, detection electric capacity CpWith diode Dp, wherein, RpAnd CpIt is connected in parallel, its one end is connected to resistance R7Left end, the other end connects
It is connected to ground；Diode DpAnode be connected to output voltage sampling circuit in main power circuit, negative electrode is connected to resistance R7It is left
End.
6. second harmonic current compensator according to claim 1, it is characterized in that：
Storage capacitor uses thin-film capacitor, the value V of storage capacitorCsWith the maximum V of storage capacitor voltageCs_max, storage capacitor
The pulsation size delta v of voltageCs, the frequency f of second harmonic current that absorbs or provide needed for compensator2ndAnd it is required absorption or
The pulsating power P of offerSHCIt is relevant, and meet following relational expression：
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7. second harmonic current compensator according to claim 6, it is characterized in that：
Filter inductance LsLower limit value determine that its expression formula is by filter inductance pulsation of current size
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V in formulabusIt is the input voltage of compensator, vCsIt is storage capacitor electric capacity, fsFor the switching frequency of compensator, PSHCFor compensation
The pulsating power for absorbing or providing needed for device, iLs_SHCIt is the second harmonic current component in filter inductance, i'Ls_SHC(t) it is
iLs_SHC(t) derived function.
8. second harmonic current compensator according to claim 1, it is characterised in that：The synchronous rectification Buck converter works
Make in CCM patterns, be made up of supervisor, auxiliary pipe, filter inductance and storage capacitor, wherein, supervisor is connected to the input electricity of compensator
Positive pressure pole and filter inductance LsBetween, auxiliary pipe is connected between the source electrode of supervisor and the negative pole of input voltage, storage capacitor CsConnection
In filter inductance LsBetween the negative pole of input voltage；The input voltage sample circuit is parallel to the input both positive and negative polarity of compensator
Between；The output voltage sampling circuit is parallel to storage capacitor two ends；The current sampling circuit is series at supervisor's electric current and returned
Lu Zhong.
9. second harmonic current compensator according to claim 1, it is characterised in that：Described voltage regulator use than
Example-integral controller, can also cascade the compensation of bandreject filtering type using the double zero point types of duopole or proportional-integral controller
Network.
10. the monocycle control method of one of the claim 1-9 second harmonic current compensators, comprises the following steps：
Supervisor in a, response single cycle controller in the rising edge of clock, synchronous rectification Buck converters is open-minded, auxiliary pipe shut-off；
Current sampling circuit sampling supervisor's current signal in b, main power circuit, and configure a constant sample-offset electricity
Pressure, makes sum of the two is permanent in full-load range to be more than 0, and regard sum of the two as one circle control variable；
C, divider calculate in real time compensator supervisor dutycycle, by the dutycycle by multiplier Mul2 with it is above-mentioned constant
Sample-offset voltage is multiplied, and obtains a reference offset voltage；
D, using second adder by needed for compensator absorb or provide second harmonic current benchmark, voltage regulator output
And described reference offset voltage is added, and obtains the benchmark of one circle control variable；
Integrator in e, single cycle controller is integrated to described one circle control variable, when integrated value and described list
When the benchmark of periodic Control variable is equal, the output state flip of comparator in single cycle controller, trigger reset is synchronous whole
The supervisor's shut-off for flowing Buck converters, auxiliary pipe is open-minded, on next clock is arrived in single cycle controller, and compensator is repeated
State step work.
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| CN106655734B (en) * | 2015-11-02 | 2019-03-01 | 南京航空航天大学 | A kind of Miniature inverter for eliminating specific subharmonic |
| CN112217381B (en) * | 2020-09-17 | 2022-03-01 | 郑州轻工业大学 | Single-phase converter direct-current bus voltage secondary ripple suppression circuit and method |
| CN113394959B (en) * | 2021-07-09 | 2022-12-13 | 南通大学 | Second harmonic current suppression system and method based on pulse power feedback |
| CN114024464B (en) * | 2021-09-28 | 2024-04-16 | 南京理工大学 | Dynamic regulation strategy for single-period control of electric spark pulse power supply |
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| CN204886680U (en) * | 2015-06-08 | 2015-12-16 | 南京航空航天大学 | Second harmonic current compensation ware |
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| CN101546963A (en) * | 2009-04-22 | 2009-09-30 | 南京航空航天大学 | Digital monocyclic control method of PFC converter |
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