CN107546973A - A kind of discontinuous mode pfc converter of low Harmonics of Input - Google Patents
A kind of discontinuous mode pfc converter of low Harmonics of Input Download PDFInfo
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Abstract
The present invention relates to a kind of discontinuous mode pfc converter of low Harmonics of Input, including main power circuit and control circuit, the input of rectifier bridge is AC voltage sources in main power circuit, export the input as Boost circuit, for the series connection of resonance suppression circuit after Boost circuit boost inductance and before switching tube, load is in parallel with the output capacitance of Boost circuit；Sampled from Boost circuit inputted, output voltage signal respectively pass through control circuit in input voltage feed forward module and Voltage loop module, export and give dutycycle generation module, obtain the duty cycle signals required for the switching tube of Boost circuit.The present invention can overcome the influence of discontinuous mode pfc converter parasitic parameter, reduce Harmonics of Input, improve transducer effciency, reduce the requirement of converter switch tube and fly-wheel diode parasitic parameter, save device cost.
Description
Technical field
The present invention relates to converters field, the discontinuous mode PFC of especially a kind of low Harmonics of Input becomes
Parallel operation.
Background technology
The performance of PFC (PFC) circuit and the mode of operation of topology, control mode and circuit are closely related.Such as
What reduces the important indicator that Harmonics of Input is PFC designs.In numerous power electronics topologys, Boost because
The advantages that its topological structure is simple, conversion efficiency is high, control strategy is easily realized, is widely used as pfc circuit.
Whether Boost can continuously be divided into continuous conduction mode (CCM) according to inductive current, critical continuous mode turns on mould
Three kinds of formula (CRM) and discontinuous conduction mode (DCM).According to the inductive current of the DCM Boost pfc converters designed in full power frequency
Discontinuous mode can be all operated in cycle；However, according to the pfc converter of CCM Model Designs when load reduces to a certain extent
When, inductive current can also be fully operational in DCM patterns.Under normal circumstances, when analyzing Boost, each component is thought
It is preferable；And in actual circuit, due to the influence of Boost circuit non-ideal characteristic, inductive current is in the mould of discontinuous mode the 3rd
The state stage, in circuit inductance can and switching tube and fly-wheel diode on parasitic capacitance resonance occurs, produce resonance current, cause
The increase of Harmonics of Input content.When circuit parasitic parameter is larger, input current abnormality is serious, total harmonic distortion factor (THD)
It is very high.
The content of the invention
It is an object of the invention to provide a kind of discontinuous mode pfc converter of low Harmonics of Input.
The technical scheme for realizing the object of the invention is：A kind of discontinuous mode pfc converter of low Harmonics of Input, by leading
Power circuit and control circuit composition；
The main power circuit includes AC voltage sources, rectifier circuit, Boost circuit, resonance suppression circuit and load；Its
The output of middle AC voltage sources connects the input of rectifier circuit, becomes half-sinusoid after the rectified bridge of alternating voltage, as Boost electricity
The input on road, resonance suppression circuit is serially connected between the boost inductance of Boost circuit and switching tube, for suppressing under discontinuous mode
Circuit parasitic parametric resonance, load are connected in parallel on the both ends of Boost circuit output capacitance；
The control circuit includes Voltage loop module, input voltage feed forward module and dutycycle generation module；Wherein from
The output voltage signal that Boost circuit samples to obtain obtains error amplification signal by Voltage loop module, is sampled from Boost circuit
Obtained input voltage signal obtains feed-forward signal by input voltage feed forward module, and error amplification signal and feed-forward signal pass through
Dutycycle generation module exports to obtain the duty cycle signals required for the switching tube of Boost circuit.
Compared with prior art, the present invention has following remarkable advantage：
(1) shadow instant invention overcomes the parasitic parameter for the pfc converter for being operated in discontinuous mode to Harmonics of Input
Ring, the input current THD close to zero can be achieved；
(2) compared with traditional RC/RCD resonance suppression circuit, diode resonance suppression circuit of the invention can reduce electricity
Path loss consumes, and improves transducer effciency；
(3) present invention suppresses the method suppression Boost parasitic parameter resonance of diode using series resonance, reduces conversion
The requirement of device switch tube and fly-wheel diode parasitic parameter, saves device cost；
(4) DCM algorithms can be realized close to 1 using the Duty ratio control method of change in wide input voltage range
Power factor.
Brief description of the drawings
Fig. 1 is the discontinuous mode pfc converter structured flowchart of the low Harmonics of Input of the present invention.
Fig. 2 is Boost pfc converter main power circuit topological diagrams.
Fig. 3 is inductive current average value and peak envelope oscillogram in half of power frequency period.
Fig. 4 is to consider the Boost pfc circuit equivalent model figures after parasitic parameter.
Fig. 5 is the theoretical inductive current oscillogram influenceed in a switch periods by parasitic parameter.
Fig. 6 is switch periods initial time resonant inductance electric current with factor of influence change curve.
Fig. 7 is the resonant stage equivalent circuit diagram with RC/RCD absorbing circuits.
Fig. 8 is the resonant stage equivalent circuit diagram for suppressing diode circuit with resonance.
Fig. 9 is that series resonance suppresses same switch cycle interior resonance inductive current theoretical waveforms before and after diode.
Figure 10 is that the resonance of the different junction capacity of series connection suppresses the influence figure of diode pair input current total harmonic distortion factor.
Figure 11 is the theoretical loss curve map that different resonance suppression circuits change with bearing power.
Embodiment
With reference to Fig. 1, the discontinuous mode pfc converter of a kind of low Harmonics of Input of the invention, by the He of main power circuit 1
Control circuit 2 forms；
The main power circuit 1 includes AC voltage sources 3, rectifier circuit 4, Boost circuit 5, resonance suppression circuit 6 and born
Carry 7；The output of wherein AC voltage sources 3 connects the input of rectifier circuit 4, becomes half-sinusoid after the rectified bridge of alternating voltage, makees
For the input of Boost circuit 5, resonance suppression circuit 6 is serially connected between the boost inductance and switching tube of Boost circuit 5, for pressing down
Circuit parasitic parametric resonance under discontinuous mode processed, load 7 are connected in parallel on the both ends of the output capacitance of Boost circuit 5；
The control circuit 2 includes Voltage loop module 8, input voltage feed forward module 9 and dutycycle generation module 10；Wherein
Obtained output voltage signal is sampled from Boost circuit 5 and obtains error amplification signal by Voltage loop module 8, from Boost circuit
The input voltage signal that 5 samplings obtain obtains feed-forward signal by input voltage feed forward module 9, and error amplification signal and feedforward are believed
Number obtain the duty cycle signals required for the switching tube of Boost circuit 5 by the output of dutycycle generation module 10.
Further, the rectifier circuit 4 include the first diode D1, the second diode D2, the 3rd diode D3 and
4th diode D4, the Boost circuit 5 include input capacitance Cin, boost inductance L, switching tube MOSFET, sustained diode
With output capacitance Co, the resonance suppression circuit 6 is by resonance suppression diode DLComposition, the load 7 is by ohmic load RLGroup
Into；
One the first diode D1 of termination of AC voltage sources 3 anode, the second diode of another termination D2's of AC voltage sources 3
Anode；First diode D1 anode is connected with the 3rd diode D3 negative electrode, the second diode D2 anode and the four or two pole
Pipe D4 negative electrode is connected, and the first diode D1 and the second diode D2 negative electrodes are connected, the 3rd diode D3 and the 4th diode D4
Anode be connected；Input capacitance CinOne end be connected with the first diode D1, the second diode D2 negative electrode, the other end and
Three diode D3 and the 4th diode D4 anode is connected；Boost inductance L one end and the first diode D1, the second diode
D2 negative electrode connection, boost inductance the L other end and resonance suppress diode DLAnode be connected, resonance suppresses diode DL
Negative electrode be connected with the drain electrode of the anode and switching tube MOSFET of sustained diode；Switching tube MOSFET source electrode and
Three diode D3 and the 4th diode D4 anode and output capacitance CoNegative pole be connected；The negative electrode of sustained diode with
Output capacitance CoPositive pole be connected；Output capacitance CoNegative pole ground connection；Ohmic load RLIt is connected in parallel on output capacitance CoBoth ends.
Further, the Voltage loop module 8 includes first voltage Error Calculator and voltage error adjuster, the first electricity
Pressure Error Calculator is used to the output voltage signal that output voltage reference signal obtains with sampling seeking difference operation, and difference is believed
Number it is sent to voltage error adjuster；Voltage error adjuster is used to produce error amplification signal according to difference signal.
Further, the input voltage feed forward module 9 includes second voltage Error Calculator and divider, second voltage
Error Calculator is used to the input voltage signal that output voltage reference signal obtains with sampling seeking difference operation, by difference signal
It is sent to divider；Divider is used to difference signal and output voltage reference signal making division arithmetic, obtains feed-forward signal.
Further, the dutycycle generation module 10 includes multiplier and Kai Gen side's calculator, and multiplier is used for will by mistake
Poor amplified signal and feed-forward signal make multiplying, and product signal is sent to out into root side's calculator；Root side's calculator is driven to be used for
Product signal is opened into the computing of root side, obtains duty cycle signals.
With reference to specific embodiment, the present invention will be further described.
Embodiment
With reference to Fig. 1, the discontinuous mode pfc converter of the low Harmonics of Input of the present embodiment is by main power circuit 1 and control
Circuit 2 processed forms；
(1) main power circuit topological structure
Main power circuit 1 includes AC voltage sources 3, rectifier circuit 4, Boost circuit 5, resonance suppression circuit 6 and load 7；
Fig. 2 is the topological diagram of Boost pfc converter main power circuits, and main circuit topology is Boost circuit, wherein, AC
Voltage source is 3kVA pressure regulators, rectifier circuit model KBJ1510, input capacitance CinFor CBB electric capacity, 630V/474nF, rise
Voltage inductance L is EE FERRITE COREs, and resonance suppresses diode DLFor SiC diode IDH05S60C, switching tube MOSFET is 2*
IPP60R190C6, sustained diode are SiC diode IDH05S60C, output filter capacitor CoFor electrochemical capacitor, 450V/
1000uF, ohmic load RLFor electronic load IT8814B.
(2) discontinuous mode pfc converter control method
For easy analysis, first make the following assumptions：(a) all devices are all preferable；(b) output capacitance is sufficiently large, protects
Demonstrate,prove DC bus-bar voltage VoIt is constant；(c) switching frequency is much larger than input voltage frequency, i.e., input voltage is in a switch periods
Constant.
The expression formula for making input voltage after rectifier bridge is
vg(t)=Vm|sinωt| (1)
In formula, VmFor the amplitude of input ac voltage, ω is input angular frequency；
Under discontinuous mode, inductance both ends meet voltage-second balance principle in each switch periods, can obtain
Wherein DyAnd d2The conducting dutycycle of switching tube and shut-off dutycycle respectively in a switch periods；
The peak value i of inductive current in one switch periodsL_pkFor
T in formulasFor switch periods, L is boost inductance value；
By formula (2) and formula (3), the average value i of inductive current in mono- switch periods of DCM can be obtainedL_avgFor
From formula (3), under discontinuous mode, it is assumed that dutycycle is definite value in half of power frequency period, then inductive current peak
It is worth envelope for sine；However, according to formula (4), now inductive current average value is disturbed factor KdInfluence, the interference factor is
The interference factor is relevant with the instantaneous value of input voltage, changes constantly in half of power frequency period, causes electricity
Inducing current average value distorts, so as to input current abnormality.
In order to eliminate influence of the interference factor to input current, it is assumed that input current is sine, i.e.,
iin(t)=iL_avg(t)=Ipk|sinωt| (6)
Wherein IpkFor the amplitude of sinusoidal reference current；
Formula (6), which is substituted into formula (4) and can obtained, makes input current for sinusoidal variable duty cycle expression formula under discontinuous mode：
Formula (6) is updated to (3) the inductive current peak envelope under variable duty cycle controls can be obtained and be
According to formula (6) and formula (8), the inductive current average value and peak envelope waveform of variable duty cycle control, such as Fig. 3 are obtained
It is shown.It can be seen that although inductive current peak envelope has been saddle ripple, but its average value is sine, it is theoretical
Upper achievable unity power factor.
The control method of discontinuous mode pfc converter is by DSP Digital Implementations, it is necessary to dutycycle expression formula to formula (7)
Carry out certain conversion processing.From formula (6), IpkSin ω t are sinusoidal reference current, and its amplitude can be by the output of Voltage loop
Obtain, its sine degree can be worth to by the sampling of input voltage, then sinusoidal reference current irefIt is expressed as
iref(t)=Ipk| sin ω t |=kvpivg(t) (9)
Wherein, k is reference current regulation coefficient, vpiFor the output of Voltage loop；
Formula (9) is substituted into formula (7), obtains the dutycycle expression formula for being used for the change of Digital Implementation under discontinuous mode
Under actual operating conditions, output voltage has certain ripple, in order to prevent the disturbance output voltage to be incorporated into
In dutycycle, by the sampling quantity of output voltage output voltage reference value VrefInstead of；Then formula (9) can be expressed as
In formula (11), L, Ts、VrefIt is known constant with k, vgObtained by sample circuit and AD conversion.In order to obtain circuit institute
The dutycycle D neededy, it is also necessary to numerical calculation is carried out to the expression formula of formula (11), including Voltage loop calculates, input voltage feed forward
Expression formula calculates and dutycycle generation calculates.
(3) influence of the discontinuous mode parasitic parameter resonance to Harmonics of Input
Being operated in the pfc converter of discontinuous mode mainly has two kinds of situations：
1) discontinuous mode is operated in full power frequency period according to the inductive current of the DCM Boost pfc converters designed；
2) according to the pfc converter of CCM Model Designs when load reduces to a certain extent, inductive current is fully operational in
DCM patterns.
Which kind of either above-mentioned situation, Boost pfc converters are operated under discontinuous mode, due to circuit parasitic parameter
Effect, resonance can occur in the mode stage of discontinuous mode the 3rd, produce resonance current, so as to produce shadow to Harmonics of Input
Ring.
When CCM Boost pfc converters work in DCM, influence of the circuit parasitic parameter to input current abnormality is quite tight
Weight, thus it is non-negligible.Fig. 4 is the typical Boost pfc circuit models considered after parasitic parameter.MOSFET output capacitance
CossMaximum is influenceed in its parasitic capacitance, therefore it is equivalent to and CossWith the parallel connection of parasitic diode；Diode equivalent is knot electricity
Hold CDIt is in parallel with diode；The boost inductance L of Boost circuit is much larger than the stray inductance in circuit, the parasitism electricity in circuit
Sense is ignored；The magnetic loss and copper loss of Boost inductance are equivalent to dead resistance Rs；CinAnd CoCapacity be much larger than parasitic capacitance,
Constant voltage source is can be considered, ignores its influence to resonance.
Under discontinuous mode, because the 3rd mode stage switch pipe and power diode are in off state, now in electricity
In the presence of the parasitic parameter of road, resonance, inductance electricity will occur with boost inductance for the parasitic capacitance on switching tube and power diode
Nonlinear change is presented in stream.The amplitude and cycle expression formula of resonance current can be expressed as formula (12) and formula (13).
Wherein, CnFor equivalent parasitic capacitances, its value is equal to MOS and power diode parasitic capacitance sum, i.e.,
Cn=CD+Coss (14)
It is recognised that its value and vg, L and CnIt is relevant, and in half of power frequency period, vgInstantaneous value changes constantly, and
L and CnAnd it is nonlinear, therefore in the initial time of different switch periods, resonance current value has uncertainty, a switch
The theoretical inductive current waveform influenceed in cycle by parasitic parameter is as shown in Figure 5.
When switching tube is opened, if resonance current is equal to 0, it is assumed that now DCM control algolithms dutycycle output is theoretical meter
Calculation value, then from formula (4), now average current is not influenceed by resonance current, shown in solid such as Fig. 5；If resonance current is big
In or less than 0, i.e. switching tube is opened moment inductive current and is not zero, it is assumed that now DCM control algolithms dutycycle output is reason
Want to be worth, then actual duty cycle is changed into (Dy± Δ d), Δ d are the disturbance quantity of dutycycle, error be present with theoretical value, such as Fig. 5 void
Shown in line, so as to which formula (4) is changed into
Understand, be non-linear relation between inductive current average value and dutycycle, less duty cycle error can also make to put down
Equal electric current has large change, therefore actual average current can be because the influence of resonance current caused by parasitic parameter resonance be presented
Nonlinear change, so as to cause input current fortuitous distortion.
(4) solution of discontinuous mode parasitic parameter resonance is suppressed
The size of switch periods initial time resonant inductance electric current is the main reason for influenceing input current abnormality.For this
Individual reason reduces parasitic parameter to input current, it is necessary to be analyzed each factor of influence in resonance current expression formula to find
The method of the influence of distortion.Resonant stage inductive current is
Assuming that output voltage is constant, input voltage is rated value, and inductance is what Boost pfc converters designed according to CCM
Value, therefore, size and C of the resonant inductance electric current in fixed switch periods initial timen、RsAnd resonance oscillation attenuation time TdThree
Factor of influence is relevant.Assuming that CnAnd resonance oscillation attenuation time TdIt is constant, it is contemplated that different switch periods resonance times are different, take t=
Corresponding switch periods are analyzed during π/4, then by formula (13) can obtain next switch periods initial time resonance current with etc.
Imitate dead resistance RsShown in the curve of change such as Fig. 6 (a), correlation computations parameter is：Input ac voltage virtual value Vin_rmsFor
220V, frequency 50Hz, output voltage VoFor 400V, power output PoFor 76W, switching frequency fsBoosted for 100kHz, boost
Inductance L is 560uH, inductance equivalent parasitic resistance RsFor 4 Ω, input filter capacitor CinFor 0.33uF, output filter capacitor CoFor
980uF。
Next switch periods initial time resonant inductance electric current can similarly be obtained respectively with resonance oscillation attenuation time TdChange
With equivalent parasitic capacitances CnThe curve of change, as shown in Fig. 6 (b) and 6 (c).
According to Fig. 6 as can be seen that in the same switch cycle, the amplitude size of resonance current decay last moment is posted with equivalent
Raw resistance is inversely proportional；The resonance oscillation attenuation time is shorter, and equivalent parasitic capacitances are bigger, then switch periods initial time resonance current amplitude
The possibility for becoming big is bigger, causes the influence of distortion bigger to input current.Therefore, parasitic parameter is reduced to input current abnormality
Influence mainly have three kinds of resolving ideas：
A) equivalent parasitic resistance is increased
Conventional resonance suppressing method is RC or RCD absorbing circuits in parallel, its resonant stage between the hourglass source electrode of metal-oxide-semiconductor
Equivalent circuit is as shown in fig. 7, wherein RrFor the resistance of absorbing circuit, CrFor the electric capacity of absorbing circuit, DrFor two poles of absorbing circuit
Pipe, because resonant tank itself equivalent resistance is smaller, by increasing absorbing circuit in resonant tank, resonance current can be made one
Decay rapidly in individual or several harmonic periods, so as to before next switching tube is opened electric current close to zero.Most hardware
Resonance suppression circuit be by increase resonant tank damp method accelerate resonance current decay, but shortcoming be can produce it is larger
Loss, influences transducer effciency.
B) the resonance oscillation attenuation time is increased
Converter, which is operated in, to be determined under frequency pattern, and after input voltage virtual value and power output determination, inductive current is half
The resonance oscillation attenuation time in individual power frequency period in each switch periods determines.Therefore, to extend the resonance oscillation attenuation time, CCM is worked as
When pfc converter is operated in DCM, convertor controls algorithm can be when by the way of reducing switching frequency to increase resonance oscillation attenuation
Between, so as to reduce influence of the resonance to input current abnormality.
C) equivalent parasitic capacitances are reduced
In actual circuit, to reduce parasitic capacitance to reduce the influence of parasitic parameter under discontinuous mode, in design CCM
The switching tube and power diode that host age preference electric capacity is as small as possible are answered during Boost.But by power device itself
Limitation, switching tube and power diode junction capacity sum are at least in 150pF or so, and compared with the device of same nominal parameter
Price is higher.
(5) the resonance suppression circuit of low Harmonics of Input
From capacitor equivalent characteristic, if one junction capacity of positive series connection is C after boost inductanceDLThe pole of power two
Pipe, then the 3rd modal resonance stage under discontinuous mode, resonant tank equivalent parasitic capacitances are
If the junction capacity of the series diode is sufficiently small, then C'nThe C being less thanDL, it is changed into so as to the expression formula of resonance current
Resonant stage equivalent circuit with series diode circuit is as shown in Figure 8.Due to the junction capacity of power diode
Very little can be reached, understand that, when converter is in resonant stage, this method can significantly reduce next switch according to Fig. 6 (c)
Cycle initial time resonance current amplitude, so as to reduce the influence to input current abnormality.Take and switched corresponding to the places of t=π/4
Exemplified by cycle, the same switch cycle, interior resonance inductive current theoretical waveform was as shown in Figure 9 before and after series diode.
Resonance suppression circuit advantage has：
(1) reduction of Harmonics of Input
The variation delta THDi of input current total harmonic distortion factor is calculated as before and after series diode
Wherein, I is total input current virtual value, I1For input current fundamental wave virtual value.By formula (11), can be calculated
The variable quantity of input current total harmonic distortion factor during the diode for different junction capacity of connecting, as shown in Figure 10.As can be seen that series connection
The parasitic capacitance of diode is smaller, and the improvement to THDi is bigger, and when the parasitic capacitance of series diode is 10pF, THDi can be with
7.9% is reduced, input current total harmonic distortion factor is reduced to 1.99% from 9.97%, close to zero.
(2) raising of efficiency
The loss of series diode includes on-state loss and switching loss.Its switching loss is mainly determined by reverse recovery loss
It is fixed, because inductive current is operated in discontinuous mode, can be neglected in the absence of the switching loss of reverse-recovery problems, therefore series diode
Slightly disregard.
When switching tube conducting and fly-wheel diode conducting, series diode is being in conducting state, now two pole
Pipe can produce additional conduction losses；It is not turned on when in the 3rd mode stage, series diode, only its junction capacity participates in energy biography
Pass, not consumed energy, therefore the on-state average loss of series diode may be calculated under discontinuous mode
Wherein VFFor the conduction voltage drop of series diode, TlineFor power frequency period, iL_avFor inductive current average value.Flow through
The average value of series diode electric current is
By formula (7) (20) (21), on-state average loss caused by series diode can be obtained
Use caused by RC absorbing circuits be lost for
Ps_RC=fsCnVo 2 (23)
fsFor switching frequency；
Loss caused by RCD absorbing circuits is about the half of RC absorbing circuits, RC/RCD parameters according to critical damping with
Lower selection.Under the conditions of same circuits, different resonance suppression circuits with bearing power change caused by theoretical loss curve as scheme
Shown in 11.As seen from Figure 11, under equal bearing power, loss caused by series diode will be much smaller than RC/RCD and absorb
The loss of circuit, therefore this method can also reduce the sacrifice to transducer effciency while input current abnormality is improved.
Claims (5)
1. a kind of discontinuous mode pfc converter of low Harmonics of Input, it is characterised in that by main power circuit (1) and control
Circuit (2) forms；
The main power circuit (1) includes AC voltage sources (3), rectifier circuit (4), Boost circuit (5), resonance suppression circuit
(6) and (7) are loaded；The output of wherein AC voltage sources (3) connects the input of rectifier circuit (4), becomes after the rectified bridge of alternating voltage
Into half-sinusoid, as the input of Boost circuit (5), resonance suppression circuit (6) is serially connected in the boost inductance of Boost circuit (5)
Between switching tube, for suppressing circuit parasitic parametric resonance under discontinuous mode, load (7) is connected in parallel on Boost circuit (5) output
The both ends of electric capacity；
The control circuit (2) includes Voltage loop module (8), input voltage feed forward module (9) and dutycycle generation module (10)；
The output voltage signal obtained from Boost circuit (5) sampling obtains error amplification signal by Voltage loop module (8), from Boost
The input voltage signal that circuit (5) sampling obtains obtains feed-forward signal, error amplification signal by input voltage feed forward module (9)
The dutycycle letter required for the switching tube of Boost circuit (5) is obtained by dutycycle generation module (10) output with feed-forward signal
Number.
2. the discontinuous mode pfc converter of low Harmonics of Input according to claim 1, it is characterised in that described whole
Stream bridge circuit (4) includes the first diode (D1), the second diode (D2), the 3rd diode (D3) and the 4th diode (D4),
The Boost circuit (5) includes input capacitance (Cin), boost inductance (L), switching tube (MOSFET), fly-wheel diode (D) and defeated
Go out electric capacity (Co), the resonance suppression circuit (6) suppresses diode (D by resonanceL) composition, the load (7) is by ohmic load
(RL) composition；
The anode of one the first diode of termination (D1) of AC voltage sources (3), the diode of another termination second of AC voltage sources (3)
(D2) anode；The anode of first diode (D1) is connected with the negative electrode of the 3rd diode (D3), the sun of the second diode (D2)
Pole is connected with the negative electrode of the 4th diode (D4), and the first diode (D1) is connected with the second diode (D2) negative electrode, the three or two pole
Pipe (D3) is connected with the anode of the 4th diode (D4)；Input capacitance (Cin) one end and the first diode (D1), the two or two pole
The negative electrode of pipe (D2) is connected, and the other end is connected with the anode of the 3rd diode (D3) and the 4th diode (D4)；Boosting electricity
Sense (L) one end be connected with the negative electrode of the first diode (D1), the second diode (D2), the other end of boost inductance (L) with it is humorous
Shake and suppress diode (DL) anode be connected, resonance suppresses diode (DL) negative electrode and fly-wheel diode (D) anode and
The drain electrode of switching tube (MOSFET) is connected；The source electrode of switching tube (MOSFET) and the 3rd diode (D3) and the 4th diode
(D4) anode and output capacitance (Co) negative pole be connected；The negative electrode of fly-wheel diode (D) and output capacitance (Co) positive pole
It is connected；Output capacitance (Co) negative pole ground connection；Ohmic load (RL) it is connected in parallel on output capacitance (Co) both ends.
3. the discontinuous mode pfc converter of low Harmonics of Input according to claim 1, it is characterised in that the electricity
Pressure ring module (8) includes first voltage Error Calculator and voltage error adjuster, and first voltage Error Calculator is used for will be defeated
Go out the output voltage signal that voltage reference signal obtains with sampling and seek difference operation, difference signal is sent to voltage error regulation
Device；Voltage error adjuster is used to produce error amplification signal according to difference signal.
4. the discontinuous mode pfc converter of low Harmonics of Input according to claim 1, it is characterised in that described defeated
Entering electric voltage feed forward module (9) includes second voltage Error Calculator and divider, and second voltage Error Calculator is used for will output
The input voltage signal that voltage reference signal obtains with sampling seeks difference operation, and difference signal is sent into divider；Divider
For difference signal and output voltage reference signal to be made into division arithmetic, feed-forward signal is obtained.
5. the discontinuous mode pfc converter of low Harmonics of Input according to claim 4, it is characterised in that described to account for
Empty to include multiplier and Kai Gen side's calculator than generation module (10), multiplier is used to make error amplification signal and feed-forward signal
Multiplying, product signal is sent to out root side's calculator；Root side's calculator is driven to be used to product signal opening the computing of root side,
Obtain duty cycle signals.
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| CN110929373A (en) * | 2019-09-29 | 2020-03-27 | 哈尔滨工程大学 | Method for analyzing parasitic parameters and degradation of Buck converter circuit |
| CN111327184A (en) * | 2018-12-14 | 2020-06-23 | 南京理工大学 | Novel circuit for inhibiting parasitic oscillation of Boost PFC converter |
| CN112117900A (en) * | 2020-08-14 | 2020-12-22 | 南京理工大学 | Parallel fixed switching frequency CRM and DCM boost PFC converter controlled by harmonic mutual elimination and parallel connection |
| CN113141108A (en) * | 2020-01-16 | 2021-07-20 | 宏碁股份有限公司 | Boost converter |
| CN113364264A (en) * | 2021-05-21 | 2021-09-07 | 珠海格力电器股份有限公司 | PFC topological circuit and control method thereof |
| CN114069631A (en) * | 2022-01-11 | 2022-02-18 | 四川大学 | Low-voltage distribution network harmonic suppression circuit |
| WO2024032078A1 (en) * | 2022-08-12 | 2024-02-15 | 上海安世博能源科技有限公司 | Circuit control method and unit, and apparatus |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111327184A (en) * | 2018-12-14 | 2020-06-23 | 南京理工大学 | Novel circuit for inhibiting parasitic oscillation of Boost PFC converter |
| CN110929373A (en) * | 2019-09-29 | 2020-03-27 | 哈尔滨工程大学 | Method for analyzing parasitic parameters and degradation of Buck converter circuit |
| CN110929373B (en) * | 2019-09-29 | 2023-01-03 | 哈尔滨工程大学 | Method for analyzing parasitic parameters and degradation of Buck converter circuit |
| CN113141108A (en) * | 2020-01-16 | 2021-07-20 | 宏碁股份有限公司 | Boost converter |
| CN112117900A (en) * | 2020-08-14 | 2020-12-22 | 南京理工大学 | Parallel fixed switching frequency CRM and DCM boost PFC converter controlled by harmonic mutual elimination and parallel connection |
| CN112117900B (en) * | 2020-08-14 | 2022-08-26 | 南京理工大学 | Parallel fixed switching frequency CRM and DCM boost PFC converter with harmonic cancellation and parallel control |
| CN113364264A (en) * | 2021-05-21 | 2021-09-07 | 珠海格力电器股份有限公司 | PFC topological circuit and control method thereof |
| CN114069631A (en) * | 2022-01-11 | 2022-02-18 | 四川大学 | Low-voltage distribution network harmonic suppression circuit |
| CN114069631B (en) * | 2022-01-11 | 2022-04-29 | 四川大学 | Low-voltage distribution network harmonic control circuit |
| WO2024032078A1 (en) * | 2022-08-12 | 2024-02-15 | 上海安世博能源科技有限公司 | Circuit control method and unit, and apparatus |
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