CN107276385A - The effective value-acquiring method of alternating voltage and device of PFC power supplys - Google Patents

The effective value-acquiring method of alternating voltage and device of PFC power supplys Download PDF

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Publication number
CN107276385A
CN107276385A CN201710483383.6A CN201710483383A CN107276385A CN 107276385 A CN107276385 A CN 107276385A CN 201710483383 A CN201710483383 A CN 201710483383A CN 107276385 A CN107276385 A CN 107276385A
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voltage
power supplys
pfc
pfc power
input
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CN107276385B (en
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黄招彬
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GD Midea Air Conditioning Equipment Co Ltd
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Guangdong Midea Refrigeration Equipment Co Ltd
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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
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

The present invention discloses the effective value-acquiring method of alternating voltage and device of a kind of PFC power supplys, wherein, the effective value-acquiring method of alternating voltage of PFC power supplys comprises the following steps：Obtain the current operating parameters of PFC power supplys；During the condition that the circuit of power factor correction for meeting PFC power supplys in the current operating parameters of PFC power supplys is closed, the circuit of power factor correction of control PFC power supplys is closed, and the first input ac voltage peak value of PFC power supplys is obtained according to the voltage at electrochemical capacitor two ends；During the condition that the circuit of power factor correction for meeting PFC power supplys in the volume current operating parameters of PFC power supplys is opened, control circuit of power factor correction is opened, and the second input ac voltage peak value of PFC power supplys is obtained according to input ac voltage instantaneous value；According to the first input ac voltage peak value or the alternating voltage virtual value of the second input ac voltage peak computational PFC power supplys.Technical solution of the present invention has the characteristics of accuracy is high.

Description

The effective value-acquiring method of alternating voltage and device of PFC power supplys
Technical field
The present invention relates to electric and electronic technical field, the alternating voltage virtual value acquisition side of more particularly to a kind of PFC power supplys Method and device.
Background technology
In the similar systems such as household electrical appliance：It is whole that the single phase alternating current power supply accessed from power network first passes around uncontrollable full-bridge Stream, then by circuit of power factor correction, finally exports dc source, and is load supplying after big capacity electrolyte capacitor. Wherein, circuit of power factor correction typically uses BOOST frameworks.BOOST type circuit of power factor correction, can not only make PFC Power supply reaches higher power factor, and can also boost the stable DC bus-bar voltage of output, to provide the straight of stabilization for load Flow power supply.
The control method of BOOST type PFCs has a variety of, such as, voltage/current double-closed-loop control algorithm, single-revolution Phase control algolithm, etc..In terms of PFC angle, alternating voltage conduct can not needed using one circle control algorithm Input quantity, and cancel alternating voltage sampling circuit, however, needing to use alternating voltage as rotection thresholds in most electric systems Or other control input parameters, this is accomplished by the basis of alternating voltage sampling circuit is cancelled carrying out alternating voltage virtual value Estimation.
Prior art obtains the alternating voltage virtual value of PFC power supplys in the following way：Voltage is used when electric current is smaller Peak computational virtual value, virtual value is calculated when electric current is larger using instantaneous voltage.Wherein, in circuit of power factor correction In any one switch periods of power switch pipe, instantaneous voltage and inductive current variable quantity, inductive current rise time, electricity Inducing current fall time is relevant.
Due to when circuit of power factor correction is operated in discontinuous mode, it is impossible to know that the electric current of inductance declines Time, therefore, prior art can not avoid the alternating voltage under circuit of power factor correction discontinuous current working condition from estimating Error, easily causes the problem of estimation alternating voltage virtual value is bigger than normal.
The content of the invention
The main object of the present invention is to provide a kind of effective value-acquiring method of alternating voltage of PFC power supplys, it is intended to which raising is obtained The accuracy of the alternating voltage virtual value of the PFC power supplys taken.
To achieve the above object, the effective value-acquiring method of alternating voltage of PFC power supplys proposed by the present invention includes following step Suddenly：
S100, the current operating parameters for obtaining PFC power supplys；
S200, the PFC power supplys current operating parameters meet PFC power supplys circuit of power factor correction close bar During part, the circuit of power factor correction of control PFC power supplys is closed, and obtains the voltage at the electrochemical capacitor two ends of PFC power supplys, then The first input ac voltage peak value of PFC power supplys is obtained according to the voltage at the electrochemical capacitor two ends；
S300, the PFC power supplys current operating parameters meet PFC power supplys circuit of power factor correction open bar During part, control the circuit of power factor correction to open, and obtain the input ac voltage instantaneous value of PFC power supplys, then basis The input ac voltage instantaneous value obtains the second input ac voltage peak value of PFC power supplys；
S400, according to the first input ac voltage peak value or the second input ac voltage peak computational PFC The alternating voltage virtual value of power supply.
Preferably, the voltage at the electrochemical capacitor two ends of the acquisition PFC power supplys, then according to the electrochemical capacitor two ends The first input ac voltage peak value that voltage obtains PFC power supplys is specifically included：
The electricity at the electrochemical capacitor two ends of S210, collection in one voltage cycle of input ac power of PFC power supplys Pressure, and it is stored as multiple voltage sample samples；
S220, the voltage sample sample for obtaining magnitude of voltage maximum in multiple voltage sample samples；
S230, the magnitude of voltage according to the maximum voltage sample sample of magnitude of voltage and the first default calculation formula calculate PFC electricity The first input ac voltage peak value in source.
Preferably, the circuit of power factor correction is BOOST frameworks, and the described first default calculation formula is：
Vac_peak 1=Vdc_peak+Vfrd+Vbd；
Wherein, Vac_peak1 is the first input ac voltage peak value of PFC power supplys, and Vdc_peak is to be added in the electrolysis The maximum of electric capacity both end voltage, Vfrd is the conduction voltage drop of fast recovery diode in the circuit of power factor correction, and Vbd is The conduction voltage drop of rectifier bridge in PFC power supplys.
Preferably, the input ac voltage instantaneous value of the acquisition PFC power supplys, then according to the input ac voltage wink The second input ac voltage peak value that duration obtains PFC power supplys is specifically included：
S310, the voltage at the detection electrochemical capacitor two ends, obtain power switch pipe in the circuit of power factor correction Switch periods and the dutycycle of opening time, and, obtain inductance in the circuit of power factor correction and opened in the power Close the current change quantity in a switch periods of pipe；
S320, the voltage according to the electrochemical capacitor two ends, the dutycycle of the power switch pipe opening time, the work( Current change quantity in a switch periods of the power switch pipe of the switch periods of rate switching tube and the inductance and Second default calculation formula calculates the input ac voltage instantaneous value of PFC power supplys；
S330, in a voltage cycle of the input ac power of PFC power supplys, circulation performs the step S310 extremely S320, until the input ac voltage instantaneous value for calculating the PFC power supplys obtained reaches n, the n is more than or equal to 2；
S340, the maximum obtained in the n input ac voltage instantaneous values, and it is used as the second input of PFC power supplys Alternating voltage peak.
Preferably, the circuit of power factor correction is BOOST frameworks, and the described second default calculation formula is：
Vac=Vdc × (1-D)+Vigbt × D+Vfrd × (1-D)+Vbd+L × Δ Iin/Ts；
Wherein, Vac is the input ac voltage instantaneous value of PFC power supplys, and Vdc is the electricity for being added in the electrochemical capacitor two ends Pressure, D is the dutycycle of power switch pipe opening time in the circuit of power factor correction, and Vigbt is the power switch pipe Conduction voltage drop, Vfrd be the circuit of power factor correction in fast recovery diode conduction voltage drop, Vbd be PFC power supplys in The conduction voltage drop of rectifier bridge, L is the inductance value of inductance in the circuit of power factor correction, and Δ Iin is the inductance described Current change quantity in one switch periods of power switch pipe, Ts is the switch periods of the power switch pipe.
Preferably, it is described according to the first input ac voltage peak value or the second input ac voltage peak meter Calculate PFC power supplys alternating voltage virtual value be specially：
It is effective according to the alternating voltage that the first input ac voltage peak value and the 3rd preset formula calculate PFC power supplys Value；Or,
It is effective according to the alternating voltage that the second input ac voltage peak value and the 3rd preset formula calculate PFC power supplys Value；
3rd preset formula is
Wherein, Vac_rms is the alternating voltage virtual value of PFC power supplys, and Vac_peak is alternating voltage peak.
Preferably, the current operating parameters of the PFC power supplys include：
The current power value for the load being connected with PFC power supplys, the present input current value of PFC power supplys and PFC power supplys At least one of present input current peak value three.
Preferably, the current operating parameters of the PFC power supplys meet the bar that the circuit of power factor correction of PFC power supplys is closed Part includes：
The current power value for the load being connected with PFC power supplys be less than default performance number, or, PFC power supplys it is current defeated Enter current value less than default input current value, or, the present input current peak value of PFC power supplys is less than default input current Peak value；
The condition that the circuit of power factor correction that the current operating parameters of the PFC power supplys meet PFC power supplys is opened includes：
The current power value for the load being connected with PFC power supplys is more than or equal to default performance number, or, PFC power supplys Present input current value be more than or equal to default input current value, or, the present input current peak value of PFC power supplys is big In or equal to default input current peak value.
Corresponding, the present invention also proposes a kind of alternating voltage virtual value acquisition device of PFC power supplys, including：
Running parameter acquisition module, the current operating parameters for obtaining PFC power supplys；
First crest voltage acquisition module, the power for meeting PFC power supplys in the current operating parameters of the PFC power supplys During the condition that factor correcting circuit is closed, the circuit of power factor correction of control PFC power supplys is closed, and obtains the electricity of PFC power supplys The voltage at electric capacity two ends is solved, the first input ac voltage of PFC power supplys is then obtained according to the voltage at the electrochemical capacitor two ends Peak value；
Second crest voltage acquisition module, the power for meeting PFC power supplys in the current operating parameters of the PFC power supplys During the condition that factor correcting circuit is opened, the circuit of power factor correction is controlled to open, and obtain the input AC of PFC power supplys Instantaneous voltage, then obtains the second input ac voltage peak value of PFC power supplys according to the input ac voltage instantaneous value；
Virtual value computing module, for according to the first input ac voltage peak value or second input AC electricity Press the alternating voltage virtual value of peak computational PFC power supplys.
Preferably, the first crest voltage acquisition module includes：
Voltage acquisition unit, for gathering the electrolysis in one voltage cycle of input ac power of PFC power supplys The voltage at electric capacity two ends, and it is stored as multiple voltage sample samples；
Maximum voltage acquiring unit, for obtaining the maximum voltage sample sample of magnitude of voltage in multiple voltage sample samples This；
First crest voltage computing unit, it is pre- for the magnitude of voltage according to the maximum voltage sample sample of magnitude of voltage and first If calculation formula calculates the first input ac voltage peak value of PFC power supplys.
Preferably, the circuit of power factor correction is BOOST frameworks, and the described first default calculation formula is：
Vac_peak 1=Vdc_peak+Vfrd+Vbd；
Wherein, Vac_peak1 is the first input ac voltage peak value of PFC power supplys, and Vdc_peak is to be added in the electrolysis The maximum of electric capacity both end voltage, Vfrd is the conduction voltage drop of fast recovery diode in the circuit of power factor correction, and Vbd is The conduction voltage drop of rectifier bridge in PFC power supplys.
Preferably, the second crest voltage acquisition module includes：
Voltage detecting subelement, the voltage for detecting the electrochemical capacitor two ends；
State obtains subelement, for obtaining in the circuit of power factor correction switch periods of power switch pipe and opening Open the dutycycle of time；
Inductive current obtains subelement, for obtaining in the circuit of power factor correction inductance in the power switch pipe A switch periods in current change quantity；
Instantaneous voltage computing unit, when being opened for the voltage according to the electrochemical capacitor two ends, the power switch pipe Between dutycycle, the switch periods of the power switch pipe and the inductance one of power switch pipe switch week The default calculation formula of current change quantity and second in phase calculates the input ac voltage instantaneous value of PFC power supplys；
Maximum instantaneous voltage acquisition unit, in a voltage cycle of the input ac power in PFC power supplys, circulating The input ac voltage instantaneous value of PFC power supplys is obtained, until the input ac voltage instantaneous value for calculating the PFC power supplys obtained reaches N, the n is more than or equal to 2；
Second crest voltage computing unit, for obtaining the maximum in the n input ac voltage instantaneous values, and makees For the second input ac voltage peak value of PFC power supplys.
Preferably, the circuit of power factor correction is BOOST frameworks, and the described second default calculation formula is：
Vac=Vdc × (1-D)+Vigbt × D+Vfrd × (1-D)+Vbd+L × Δ Iin/Ts；
Wherein, Vac is the input ac voltage instantaneous value of PFC power supplys, and Vdc is the electricity for being added in the electrochemical capacitor two ends Pressure, D is the dutycycle of power switch pipe opening time in the circuit of power factor correction, and Vigbt is the power switch pipe Conduction voltage drop, Vfrd be the circuit of power factor correction in fast recovery diode conduction voltage drop, Vbd be PFC power supplys in The conduction voltage drop of rectifier bridge, L is the inductance value of inductance in the circuit of power factor correction, and Δ Iin is the inductance described Current change quantity in one switch periods of power switch pipe, Ts is the switch periods of the power switch pipe.
Preferably, the virtual value computing module specifically for：
It is effective according to the alternating voltage that the first input ac voltage peak value and the 3rd preset formula calculate PFC power supplys Value；Or,
It is effective according to the alternating voltage that the second input ac voltage peak value and the 3rd preset formula calculate PFC power supplys Value；
3rd preset formula is
Wherein, Vac_rms is the alternating voltage virtual value of PFC power supplys, and Vac_peak is alternating voltage peak.
In the effective value-acquiring method of alternating voltage of this PFC power supplys：First, the current operating parameters of PFC power supplys are obtained.So Afterwards, if meeting the condition that the circuit of power factor correction of PFC power supplys is closed in the current operating parameters of PFC power supplys, PFC is controlled The circuit of power factor correction of power supply is closed, and the first input for obtaining PFC power supplys according to the voltage at the two ends of electrochemical capacitor is handed over Flow voltage peak；If during the condition that the circuit of power factor correction that the current operating parameters of PFC power supplys meet PFC power supplys is opened, PFC electric power startings are then controlled, and according to the second input AC of the input ac voltage instantaneous value of PFC power supplys acquisition PFC power supplys Voltage peak.Finally, according to the friendship of the first input ac voltage peak value or the second input ac voltage peak computational PFC power supplys Flow voltage effective value.Because discontinuous conduct mode is only present near current zero-crossing point, and the technical program is in PFC power supplys During the condition that the circuit of power factor correction that current operating parameters meet PFC power supplys is opened, just according to the input AC of PFC power supplys Instantaneous voltage obtains the second input ac voltage peak value of PFC power supplys, and it is effective to calculate the alternating voltage of PFC power supplys accordingly Value.Therefore, the technical program can avoid discontinuous conduct mode from obtaining the dry of result to the alternating voltage virtual value of PFC power supplys Disturb, relative to prior art, technical solution of the present invention has the characteristics of accuracy is high.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with Structure according to these accompanying drawings obtains other accompanying drawings.
Fig. 1 is the electrical block diagram of PFC power supplys of the present invention；
Fig. 2 is the schematic flow sheet of the effective embodiment of value-acquiring method one of alternating voltage of PFC power supplys of the present invention；
The refinement schematic flow sheet that Fig. 3 is step S200 in Fig. 2；
The refinement schematic flow sheet that Fig. 4 is step S300 in Fig. 2；
Fig. 5 is the high-level schematic functional block diagram of the embodiment of alternating voltage virtual value acquisition device one of PFC power supplys of the present invention；
Fig. 6 is the high-level schematic functional block diagram of the embodiment of the first crest voltage acquisition module one in Fig. 5；
Fig. 7 is the high-level schematic functional block diagram of the embodiment of the second crest voltage acquisition module one in Fig. 5.
The realization, functional characteristics and advantage of the object of the invention will be described further referring to the drawings in conjunction with the embodiments.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete Site preparation is described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Base Embodiment in the present invention, those of ordinary skill in the art obtained under the premise of creative work is not made it is all its His embodiment, belongs to the scope of protection of the invention.
It is to be appreciated that the description for being related to " first ", " second " etc. in the present invention is only used for describing purpose, without being understood that To indicate or implying its relative importance or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", At least one this feature can be expressed or be implicitly included to the feature of " second ".In addition, the technical side between each embodiment Case can be combined with each other, but must can be implemented as basis with those of ordinary skill in the art, when the combination of technical scheme It will be understood that the combination of this technical scheme is not present, also not in the guarantor of application claims when appearance is conflicting or can not realize Within the scope of shield.
The present invention proposes a kind of effective value-acquiring method of alternating voltage of PFC power supplys.Wherein, PFC electrical source power factors school Positive circuit, the topological structure of the circuit of power factor correction has multiple choices, such as, BOOST, BUCK, etc..
For ease of being better understood from technical solution of the present invention, here, the present embodiment is with BOOST type circuit of power factor correction Exemplified by the operation principles of PFC power supplys is illustrated.
As shown in figure 1, PFC power supplys include rectifier bridge BD, electrochemical capacitor C and BOOST type circuit of power factor correction 10, BOOST types circuit of power factor correction 10 includes inductance L, power switch pipe IGBT, fast recovery diode FRD and controller.It is whole The AC power AC that bridge BD input is used to connect input is flowed, rectifier bridge BD anode is connected with inductance L first end, inductance The anode interconnection at L the second end, power switch pipe IGBT input and fast recovery diode FRD, fast recovery diode FRD's Negative electrode is connected with electrochemical capacitor C positive pole, and its connecting node is used for the positive pole for connecting load.Rectifier bridge BD negative terminal, power is opened Pipe IGBT output end and electrochemical capacitor C negative pole interconnection are closed, its connecting node is used for the negative pole for connecting load, power switch pipe IGBT controlled end and the control end of controller are connected.
Wherein, controller is used to export PWM ripples to power switch pipe IGBT controlled end, so that circuit of power factor correction 10 open, and realize power factor emendation function.
Specifically, when power switch pipe IGBT is opened, electric current from the output of rectifier bridge BD anode, successively through inductance L and Power switch pipe IGBT returns to rectifier bridge BD negative terminals.In the process, inductance L electric currents linearly rise, and its voltage relationship is met：
Vac=L × pIin+Vigbt+Vbd；(1)
When power switch pipe IGBT is turned off, electric current is exported from rectifier bridge BD anodes, successively through inductance L, two poles of fast recovery Pipe FRD and electrochemical capacitor C (and load) return to rectifier bridge BD negative terminals.In the process：When rectifier bridge BD output voltage is high When electrochemical capacitor C voltage, inductance L electric currents continue to rise；When rectifier bridge BD output voltage is less than electrochemical capacitor C voltage When, inductance L electric current declines.Its voltage relationship is met：
Vac=Vdc+L × pIin+Vfrd+Vbd；(2)
Wherein, Vac is PFC power input alternating voltage instantaneous values (absolute value), and Vdc is electrochemical capacitor C voltage, and Iin is Inductance L current instantaneous values, p is differential operator, and L is inductance L inductance value, and Vbd is that rectifier bridge BD conduction voltage drops, Vigbt are work( Rate switching tube IGBT conduction voltage drops, Vfrd are fast recovery diode FRD conduction voltage drops.
If the cycle of PWM ripples is Ts, in each PWM cycle, the time that power switch pipe IGBT is opened is Ton, and power is opened The time for closing pipe IGBT shut-offs is Toff, there is Ts=Ton+Toff, and note dutycycle is D=Ton/Ts.If in each PWM cycle, The time that inductance L electric currents rise is Tup, and the time that inductance L electric currents decline is Tfall.In each PWM cycle on inductance L electric currents It is ultimate current changes delta Iin to rise and decline sum, i.e.,
(Vac-Vigbt-Vbd) × Tup+ (Vac-Vdc-Vfrd-Vbd) × Tfall=L × Δ Iin；(3)
When circuit of power factor correction 10 is operated in continuous current mode or electric current critical conduction mode, Ton=is met Tup, Toff=Tfall, then have：
Vac=Vdc × (1-D)+Vigbt × D+Vfrd × (1-D)+Vbd+L × Δ Iin/Ts；(4)
When circuit of power factor correction 10 is operated in discontinuous conduct mode, inductance L electric currents are in current PWM cycle from zero Begin to ramp up, finally drop to zero, ultimate current changes delta Iin=0, meet Ton=Tup, Toff>Tfall, then have：
Vac=Vdc × Tfall/ (Ton+Tfall)+Vigbt × Ton/ (Ton+Tfall)+Vfrd × Tfall/ (Ton+ Tfall)+Vbd；(5)
Due to when circuit of power factor correction 10 is operated in discontinuous conduct mode, it is impossible to directly know Tfall, thus it is logical The alternating voltage virtual value of PFC power supplys can not directly be obtained by crossing above formula (5).Because when circuit of power factor correction 10 is operated in electricity When flowing discontinuous mode, Toff>Tfall, so it is effective to obtain alternating voltage with calculating in Toff replacement Tfall substitution above formulas (5) Value will be bigger than normal than actual value.This is to cause the reason for PFC mains alternating voltage virtual values of acquisition are bigger than normal using prior art.
Based on foregoing description, referring to Fig. 2, in one embodiment, the alternating voltage virtual value estimation side of above-mentioned PFC power supplys Method comprises the following steps：
S100, the current operating parameters for obtaining PFC power supplys；
Here, the current operating parameters of PFC power supplys can be the performance number for the load being connected with PFC power supplys；Can also be The input current value of PFC power supplys, or, the input current peak value of PFC power supplys；It can also be the load that is connected with PFC power supplys Any one combination of the input current peak value three of performance number, the input current value of PFC power supplys and PFC power supplys.
When PFC power supply out-put supply powering loads, if circuit of power factor correction 10 is opened, the output of PFC power supplys Power supply after capability correction is extremely loaded；If circuit of power factor correction 10 is closed, electricity of the PFC power supplys output without capability correction Source is extremely loaded.
Load therein, can be actual electrical equipment, such as the analogue means of motor or test, than Such as resistance.
In the present embodiment, the current operating parameters on how to obtain PFC power supplys, using running parameter as the defeated of PFC power supplys Enter and illustrate exemplified by current value.
Specifically, it can be concatenated on the electric current main line of PFC power supplys with detection resistance (not shown), one end of the detection resistance Ground connection, other end connection rectifier bridge BD negative terminal or the negative pole of load.In this way, ignoring the influence detection electricity such as temperature, electric current Hinder under conditions of resistance, the voltage in the detection resistance other end fallen by (not shown) detection of voltage check device, it is possible to Obtain the input current of PFC power supplys.Also, when the other end connection rectifier bridge BD of detection resistance negative terminal, the electricity detected Press as negative voltage；When the negative pole of the other end connection load of detection resistance, the voltage detected is positive voltage.It is preferred that inspection The negative pole of the other end connection load of slowdown monitoring circuit.To widen the range of choice of voltage check device.
It is noted that using aforesaid way, the input current peak value of PFC power supplys can also be obtained.
S200, PFC power supplys current operating parameters meet PFC power supplys circuit of power factor correction 10 close condition When, the circuit of power factor correction 10 of control PFC power supplys is closed, and obtains the voltage at the electrochemical capacitor C two ends of PFC power supplys, so The first input ac voltage peak value of PFC power supplys is obtained according to the voltage at electrochemical capacitor C two ends afterwards；
Here, the condition that the circuit of power factor correction 10 that the current operating parameters of PFC power supplys meet PFC power supplys is closed can Elect as：The current operating parameters of PFC power supplys are less than default running parameter.Such as, the current work(for the load being connected with PFC power supplys Rate value is less than default performance number, the present input current values of PFC power supplys is less than default input current value, and PFC power supplys are worked as Preceding input current peak value is less than default input current peak value, etc., does not enumerate herein.
It should be noted that in PFC power supplys, setting the meaning of circuit of power factor correction 10 to be that the biography of reduction power supply Defeated loss.When the current operating parameters of PFC power supplys (include the input of the performance number of the load being connected with PFC power supplys, PFC power supplys Current value, input current peak value of PFC power supplys etc.) it is smaller when, the transmission loss radix of power supply is smaller, circuit of power factor correction 10 effect embodies relatively weak, or even the power consumption of of emergent power factor correcting circuit 10 itself is more than circuit of power factor correction The situation of the power delivery loss of 10 reductions.Therefore, the technical program can be according to the selection of the actual working state of PFC power supplys It is no to need to open circuit of power factor correction 10, not only facilitate the alternating voltage virtual value of PFC power supplys to obtain, PFC can also be made The reactive power loss of power supply is maintained at a relatively low state.
In addition, in the present embodiment, on how to determine that the current operating parameters of PFC power supplys are less than default running parameter, Various ways can be used.
Such as, the current operating parameters of PFC power supplys are obtained；Calculate the current operating parameters of PFC power supplys and default work The difference of parameter；If the difference is less than zero, it is determined that the current operating parameters of PFC power supplys are less than default running parameter.In this way, It can quickly determine whether the current operating parameters of PFC power supplys are less than default running parameter.
Or, obtain the current operating parameters of PFC power supplys；Calculate the current operating parameters of PFC power supplys and default work The difference of parameter；Circulation performs above-mentioned action, to obtain the current operating parameters and default work of multiple PFC power supplys calculated Make the difference of parameter；Calculate the average value of above-mentioned multiple differences；If the average value of above-mentioned multiple differences is less than zero, it is determined that PFC The current operating parameters of power supply are less than default running parameter.In this way, detection error can be avoided to the shadow of data acquisition result Ring, and then improve reliability.
If it is noted that running parameter is the input current of PFC power supplys, default PFC mains input currents value It can be selected between 1 ampere to 2 amperes.
It is preferred that referring to Fig. 3, the voltage at the electrochemical capacitor C two ends of PFC power supplys can be obtained in the following way, and root The first input ac voltage peak value of PFC power supplys is obtained according to the voltage at electrochemical capacitor C two ends：
The electricity at the electrochemical capacitor C two ends of S210, collection in mono- voltage cycle of input ac power AC of PFC power supplys Pressure, and it is stored as multiple voltage sample samples；
S220, the voltage sample sample for obtaining magnitude of voltage maximum in multiple voltage sample samples；
S230, the magnitude of voltage according to the maximum voltage sample sample of magnitude of voltage and the first default calculation formula calculate PFC electricity The first input ac voltage peak value in source.
It is understood that in mono- voltage cycle of input ac power AC of PFC power supplys, the voltage sample stored Sample is more, and the maximum magnitude of voltage of voltage sample sample of magnitude of voltage more connects with the first input ac voltage peak value of PFC power supplys Closely.It is preferred that in the present embodiment, the voltage sample sample of storage is between 50 to 100.
In addition, it can be seen from the operation principle of above-mentioned PFC power supplys, when circuit of power factor correction 10 is closed, power is opened Pipe IGBT shut-offs are closed, rectifier bridge BD, inductance L, fast recovery diode FRD and electrochemical capacitor C-shaped have into current loop：
Vac_peak 1=Vdc_peak+Vfrd+Vbd；(6)
Wherein, Vac_peak1 is the first input ac voltage peak value of PFC power supplys, and Vdc_peak is to be added in electrochemical capacitor C The maximum of both end voltage.Above formula (6), the as first default calculation formula.
Because when circuit of power factor correction 10 is closed, above formula (6) is permanent establishment, and works as what is stored When voltage sample sample is enough, the magnitude of voltage of the maximum voltage sample sample of magnitude of voltage, fast recovery diode FRD conducting pressure Drop and rectifier bridge BD conduction voltage drop and with PFC power supplys the first input ac voltage peak value are almost equal.Therefore, this implementation Example can obtain to obtain accurate the first input ac voltage peak value.
S300, PFC power supplys current operating parameters meet PFC power supplys circuit of power factor correction 10 open strip Part, control circuit of power factor correction 10 is opened, and obtains the input ac voltage instantaneous value of PFC power supplys, then according to input Alternating voltage instantaneous value obtains the second input ac voltage peak value of PFC power supplys；
Here, the condition that the circuit of power factor correction 10 that the current operating parameters of PFC power supplys meet PFC power supplys is opened can Elect as：The current operating parameters of PFC power supplys are more than or equal to default running parameter.Such as, the load being connected with PFC power supplys Current power value be more than or equal to default performance number, the present input current values of PFC power supplys is more than or equal to default Input current value, the present input current peak values of PFC power supplys is more than or equal to default input current peak value, etc., this Place is not enumerated.
It should be noted that in PFC power supplys, setting the meaning of circuit of power factor correction 10 to be that the biography of reduction power supply Defeated loss.When the current operating parameters of PFC power supplys (include the input of the performance number of the load being connected with PFC power supplys, PFC power supplys Current value, input current peak value of PFC power supplys etc.) it is larger when, the transmission loss radix of power supply is larger, circuit of power factor correction 10 effect embodies relatively obvious.Therefore, the technical program can choose whether need according to the actual working state of PFC power supplys Circuit of power factor correction 10 is opened, not only facilitates the alternating voltage virtual value of PFC power supplys to obtain, PFC power supplys can also be made Reactive power loss be maintained at a relatively low state.
In addition, in the present embodiment, on how to determine that the current operating parameters of PFC power supplys are more than or equal to default work Make parameter, multiple means can be used.
Such as, the current operating parameters of PFC power supplys are obtained；Calculate the current operating parameters of PFC power supplys and default work The difference of parameter；If the difference is more than or equal to zero, it is determined that the current operating parameters of PFC power supplys are more than or equal to default Running parameter.In this way, can quickly determine whether the current operating parameters of PFC power supplys are more than or equal to default work ginseng Number.
Or, obtain the current operating parameters of PFC power supplys；Calculate the current operating parameters of PFC power supplys and default work The difference of parameter；Circulation performs above-mentioned action, to obtain the current operating parameters and default work of multiple PFC power supplys calculated Make the difference of parameter；Calculate the average value of above-mentioned multiple differences；If the average value of above-mentioned multiple differences is more than or equal to zero, Determine that the current operating parameters of PFC power supplys are more than or equal to default running parameter.In this way, detection error logarithm can be avoided According to the influence for obtaining result, and then improve reliability.
If it is noted that running parameter is the input current of PFC power supplys, default PFC mains input currents value It can be selected between 1 ampere to 2 amperes.
It is preferred that referring to Fig. 4, the input ac voltage instantaneous value of PFC power supplys can be obtained in the following way, and according to Input ac voltage instantaneous value obtains the second input ac voltage peak value of PFC power supplys：
S310, the voltage at detection electrochemical capacitor C two ends, obtain power switch pipe IGBT in circuit of power factor correction 10 Switch periods and the dutycycle of opening time, and, inductance L is in power switch pipe IGBT in acquisition circuit of power factor correction 10 A switch periods in current change quantity；
S320, the voltage according to electrochemical capacitor C two ends, the dutycycle of power switch pipe IGBT opening times, power switch Current change quantity and second of the pipe IGBT switch periods and inductance L in a power switch pipe IGBT switch periods Default calculation formula calculates the input ac voltage instantaneous value of PFC power supplys；
S330, in the input ac power AC of a PFC power supplys voltage cycle, circulation performs step S310 extremely S320, until the input ac voltage instantaneous value for calculating the PFC power supplys obtained reaches n, n is more than or equal to 2；
S340, the maximum obtained in n input ac voltage instantaneous value, and it is used as the second input AC of PFC power supplys Voltage peak.
It is understood that in mono- voltage cycle of input ac power AC of PFC power supplys, calculating the PFC electricity obtained The input ac voltage instantaneous value in source is more, the second input of the maximum electricity in input ac voltage instantaneous value and PFC power supplys Alternating voltage peak closer to.It is preferred that in the present embodiment, the input ac voltage instantaneous value for calculating the PFC power supplys obtained exists Between 50 to 100.
In addition, it can be seen from the operation principle of above-mentioned PFC power supplys, when circuit of power factor correction 10 is operated in continuous current When pattern or critical current pattern, input ac voltage instantaneous value can be calculated using following formula：
Vac=Vdc × (1-D)+Vigbt × D+Vfrd × (1-D)+Vbd+L × Δ Iin/Ts；(7)
Above formula (7), the as second default calculation formula.
Because when circuit of power factor correction 10 is in opening, the electric current for flowing through load is larger, has moved away from electricity Zero point is flowed through, circuit of power factor correction 10 is rarely possible to be operated in discontinuous current mode.Therefore, the present embodiment can be obtained Accurate second input ac voltage peak value.
S400, the friendship according to the first input ac voltage peak value or the second input ac voltage peak computational PFC power supplys Flow voltage effective value.
Specifically, the alternating current for calculating PFC power supplys according to the first input ac voltage peak value and the 3rd preset formula is pressed with Valid value；Or, the alternating voltage virtual value of PFC power supplys is calculated according to the second input ac voltage peak value and the 3rd preset formula.
Here, the 3rd preset formula is
Wherein, Vac_rms is the alternating voltage virtual value of PFC power supplys, and Vac_peak is alternating voltage peak.
In the effective value-acquiring method of alternating voltage of this PFC power supplys：First, the current operating parameters of PFC power supplys are obtained.So Afterwards, if the current operating parameters of PFC power supplys meet the condition that the circuit of power factor correction 10 of PFC power supplys is closed, PFC is controlled The circuit of power factor correction 10 of power supply is closed, and the first input for obtaining PFC power supplys according to the voltage at electrochemical capacitor C two ends is handed over Flow voltage peak；If the current operating parameters of PFC power supplys meet the condition that the circuit of power factor correction 10 of PFC power supplys is opened, PFC electric power startings are then controlled, and according to the second input AC of the input ac voltage instantaneous value of PFC power supplys acquisition PFC power supplys Voltage peak.Finally, according to the friendship of the first input ac voltage peak value or the second input ac voltage peak computational PFC power supplys Flow voltage effective value.Because discontinuous conduct mode is only present near current zero-crossing point, and the technical program is in PFC power supplys During the condition that the circuit of power factor correction 10 that current operating parameters meet PFC power supplys is opened, just handed over according to the input of PFC power supplys The second input ac voltage peak value that instantaneous voltage obtains PFC power supplys is flowed, and it is effective to calculate the alternating voltage of PFC power supplys accordingly Value.Therefore, the technical program can avoid discontinuous conduct mode from obtaining the dry of result to the alternating voltage virtual value of PFC power supplys Disturb, relative to prior art, technical solution of the present invention has the characteristics of accuracy is high.
Corresponding, the present invention also proposes a kind of alternating voltage virtual value acquisition device of PFC power supplys, referring to Fig. 5, one In embodiment, the alternating voltage virtual value acquisition device of the PFC power supplys includes：
Running parameter acquisition module 100, the current operating parameters for obtaining PFC power supplys；
Here, the current operating parameters of PFC power supplys can be the performance number for the load being connected with PFC power supplys；Can also be The input current value of PFC power supplys, or, the input current peak value of PFC power supplys；It can also be the load that is connected with PFC power supplys Any one combination of the input current peak value three of performance number, the input current value of PFC power supplys and PFC power supplys.
When PFC power supply out-put supply powering loads, if circuit of power factor correction 10 is opened, the output of PFC power supplys Power supply after capability correction is extremely loaded；If circuit of power factor correction 10 is closed, electricity of the PFC power supplys output without capability correction Source is extremely loaded.
Load therein, can be actual electrical equipment, such as the analogue means of motor or test, than Such as resistance.
In the present embodiment, the current operating parameters on how to obtain PFC power supplys, using running parameter as the defeated of PFC power supplys Enter and illustrate exemplified by current value.
Specifically, it can be concatenated on the electric current main line of PFC power supplys with detection resistance (not shown), one end of the detection resistance Ground connection, other end connection rectifier bridge BD negative terminal or the negative pole of load.In this way, ignoring the influence detection electricity such as temperature, electric current Hinder under conditions of resistance, the voltage in the detection resistance other end fallen by (not shown) detection of voltage check device, it is possible to Obtain the input current of PFC power supplys.Also, when the other end connection rectifier bridge BD of detection resistance negative terminal, the electricity detected Press as negative voltage；When the negative pole of the other end connection load of detection resistance, the voltage detected is positive voltage.It is preferred that inspection The negative pole of the other end connection load of slowdown monitoring circuit.To widen the range of choice of voltage check device.
It is noted that using aforesaid way, the input current peak value of PFC power supplys can also be obtained.
First crest voltage acquisition module 200, the power for meeting PFC power supplys in the current operating parameters of PFC power supplys During the condition that factor correcting circuit 10 is closed, the circuit of power factor correction 10 of control PFC power supplys is closed, and obtains PFC power supplys Electrochemical capacitor C two ends voltage, then according to the voltage at electrochemical capacitor C two ends obtain PFC power supplys the first input AC electricity Voltage crest value；
Here, the condition that the circuit of power factor correction 10 that the current operating parameters of PFC power supplys meet PFC power supplys is closed can Elect as：The current operating parameters of PFC power supplys are less than default running parameter.Such as, the current work(for the load being connected with PFC power supplys Rate value is less than default performance number, the present input current values of PFC power supplys is less than default input current value, and PFC power supplys are worked as Preceding input current peak value is less than default input current peak value, etc., does not enumerate herein.
It should be noted that in PFC power supplys, setting the meaning of circuit of power factor correction 10 to be that the biography of reduction power supply Defeated loss.When the current operating parameters of PFC power supplys (include the input of the performance number of the load being connected with PFC power supplys, PFC power supplys Current value, input current peak value of PFC power supplys etc.) it is smaller when, the transmission loss radix of power supply is smaller, circuit of power factor correction 10 effect embodies relatively weak, or even the power consumption of of emergent power factor correcting circuit 10 itself is more than circuit of power factor correction The situation of the power delivery loss of 10 reductions.Therefore, the technical program can be according to the selection of the actual working state of PFC power supplys It is no to need to open circuit of power factor correction 10, not only facilitate the alternating voltage virtual value of PFC power supplys to obtain, PFC can also be made The reactive power loss of power supply is maintained at a relatively low state.
In addition, in the present embodiment, on how to determine that the current operating parameters of PFC power supplys are less than default running parameter, Various ways can be used.
Such as, the current operating parameters of PFC power supplys are obtained；Calculate the current operating parameters of PFC power supplys and default work The difference of parameter；If the difference is less than zero, it is determined that the current operating parameters of PFC power supplys are less than default running parameter.In this way, It can quickly determine whether the current operating parameters of PFC power supplys are less than default running parameter.
Or, obtain the current operating parameters of PFC power supplys；Calculate the current operating parameters of PFC power supplys and default work The difference of parameter；Circulation performs above-mentioned action, to obtain the current operating parameters and default work of multiple PFC power supplys calculated Make the difference of parameter；Calculate the average value of above-mentioned multiple differences；If the average value of above-mentioned multiple differences is less than zero, it is determined that PFC The current operating parameters of power supply are less than default running parameter.In this way, detection error can be avoided to the shadow of data acquisition result Ring, and then improve reliability.
If it is noted that running parameter is the input current of PFC power supplys, default PFC mains input currents value It can be selected between 1 ampere to 2 amperes.
It is preferred that referring to Fig. 6, above-mentioned first crest voltage acquisition module 200 includes：
Voltage acquisition unit 210, for gathering the electrolysis in mono- voltage cycle of input ac power AC of PFC power supplys The voltage at electric capacity C two ends, and it is stored as multiple voltage sample samples；
Maximum voltage acquiring unit 220, for obtaining the maximum voltage sample sample of magnitude of voltage in multiple voltage sample samples This；
First crest voltage computing unit 230, for the magnitude of voltage according to the maximum voltage sample sample of magnitude of voltage and the One default calculation formula calculates the first input ac voltage peak value of PFC power supplys.
It is understood that in mono- voltage cycle of input ac power AC of PFC power supplys, the voltage sample stored Sample is more, and the maximum magnitude of voltage of voltage sample sample of magnitude of voltage more connects with the first input ac voltage peak value of PFC power supplys Closely.It is preferred that in the present embodiment, the voltage sample sample of storage is between 50 to 100.
In addition, it can be seen from the operation principle of above-mentioned PFC power supplys, when circuit of power factor correction 10 is closed, power is opened Pipe IGBT shut-offs are closed, rectifier bridge BD, inductance L, fast recovery diode FRD and electrochemical capacitor C-shaped have into current loop：
Vac_peak 1=Vdc_peak+Vfrd+Vbd；(6)
Wherein, Vac_peak1 is the first input ac voltage peak value of PFC power supplys, and Vdc_peak is to be added in electrochemical capacitor C The maximum of both end voltage.Above formula (6), the as first default calculation formula.
Because when circuit of power factor correction 10 is closed, above formula (6) is permanent establishment, and works as what is stored When voltage sample sample is enough, the magnitude of voltage of the maximum voltage sample sample of magnitude of voltage, fast recovery diode FRD conducting pressure Drop and rectifier bridge BD conduction voltage drop and with PFC power supplys the first input ac voltage peak value are almost equal.Therefore, this implementation Example can obtain to obtain accurate the first input ac voltage peak value.
Second crest voltage acquisition module 300, the power for meeting PFC power supplys in the current operating parameters of PFC power supplys During the unlocking condition of factor correcting circuit 10, control circuit of power factor correction 10 is opened, and obtains the input AC of PFC power supplys Instantaneous voltage, then obtains the second input ac voltage peak value of PFC power supplys according to input ac voltage instantaneous value；
Here, the condition that the circuit of power factor correction 10 that the current operating parameters of PFC power supplys meet PFC power supplys is opened can Elect as：The current operating parameters of PFC power supplys are more than or equal to default running parameter.Such as, the load being connected with PFC power supplys Current power value be more than or equal to default performance number, the present input current values of PFC power supplys is more than or equal to default Input current value, the present input current peak values of PFC power supplys is more than or equal to default input current peak value, etc., this Place is not enumerated.
It should be noted that in PFC power supplys, setting the meaning of circuit of power factor correction 10 to be that the biography of reduction power supply Defeated loss.When the current operating parameters of PFC power supplys (include the input of the performance number of the load being connected with PFC power supplys, PFC power supplys Current value, input current peak value of PFC power supplys etc.) it is larger when, the transmission loss radix of power supply is larger, circuit of power factor correction 10 effect embodies relatively obvious.Therefore, the technical program can choose whether need according to the actual working state of PFC power supplys Circuit of power factor correction 10 is opened, not only facilitates the alternating voltage virtual value of PFC power supplys to obtain, PFC power supplys can also be made Reactive power loss be maintained at a relatively low state.
In addition, in the present embodiment, on how to determine that the current operating parameters of PFC power supplys are more than or equal to default work Make parameter, multiple means can be used.
Such as, the current operating parameters of PFC power supplys are obtained；Calculate the current operating parameters of PFC power supplys and default work The difference of parameter；If the difference is more than or equal to zero, it is determined that the current operating parameters of PFC power supplys are more than or equal to default Running parameter.In this way, can quickly determine whether the current operating parameters of PFC power supplys are more than or equal to default work ginseng Number.
Or, obtain the current operating parameters of PFC power supplys；Calculate the current operating parameters of PFC power supplys and default work The difference of parameter；Circulation performs above-mentioned action, to obtain the current operating parameters and default work of multiple PFC power supplys calculated Make the difference of parameter；Calculate the average value of above-mentioned multiple differences；If the average value of above-mentioned multiple differences is more than or equal to zero, Determine that the current operating parameters of PFC power supplys are more than or equal to default running parameter.In this way, detection error logarithm can be avoided According to the influence for obtaining result, and then improve reliability.
If it is noted that running parameter is the input current of PFC power supplys, default PFC mains input currents value It can be selected between 1 ampere to 2 amperes.
It is preferred that referring to Fig. 7, the second crest voltage acquisition module 300 includes：
Voltage detecting subelement 311, the voltage for detecting electrochemical capacitor C two ends；
State obtains subelement 312, the switch week for obtaining power switch pipe IGBT in circuit of power factor correction 10 Phase and the dutycycle of opening time；
Inductance L electric currents obtain subelement 313, for obtaining in circuit of power factor correction 10 inductance L in power switch pipe Current change quantity in an IGBT switch periods；
Instantaneous voltage computing unit 320, when being opened for the voltage according to electrochemical capacitor C two ends, power switch pipe IGBT Between dutycycle, power switch pipe IGBT switch periods and inductance L in a power switch pipe IGBT switch periods Current change quantity and the second default calculation formula calculate the input ac voltage instantaneous values of PFC power supplys；
Maximum instantaneous voltage acquisition unit 330, a voltage cycle for the input ac power AC in PFC power supplys Interior, circulation obtains the input ac voltage instantaneous value of PFC power supplys, until calculating the input ac voltage wink of the PFC power supplys obtained Duration reaches n, and n is more than or equal to 2；
Second crest voltage computing unit 340, for obtaining the maximum in n input ac voltage instantaneous value, and makees For the second input ac voltage peak value of PFC power supplys.
It is understood that in mono- voltage cycle of input ac power AC of PFC power supplys, calculating the PFC electricity obtained The input ac voltage instantaneous value in source is more, the second input of the maximum electricity in input ac voltage instantaneous value and PFC power supplys Alternating voltage peak closer to.It is preferred that in the present embodiment, the input ac voltage instantaneous value for calculating the PFC power supplys obtained exists Between 50 to 100.
In addition, it can be seen from the operation principle of above-mentioned PFC power supplys, when circuit of power factor correction 10 is operated in continuous current When pattern or critical current pattern, input ac voltage instantaneous value can be calculated using following formula：
Vac=Vdc × (1-D)+Vigbt × D+Vfrd × (1-D)+Vbd+L × Δ Iin/Ts；(7)
Above formula (7), the as second default calculation formula.
Because when circuit of power factor correction 10 is in opening, the electric current for flowing through load is larger, has moved away from electricity Zero point is flowed through, circuit of power factor correction 10 is rarely possible to be operated in discontinuous current mode.Therefore, the present embodiment can be obtained Accurate second input ac voltage peak value.
Virtual value computing module 400, for according to the first input ac voltage peak value or the second input ac voltage peak Value calculates the alternating voltage virtual value of PFC power supplys.Specifically, for according to the first input ac voltage peak value and the 3rd default public affairs Formula calculates the alternating voltage virtual value of PFC power supplys；Or, calculated according to the second input ac voltage peak value and the 3rd preset formula The alternating voltage virtual value of PFC power supplys.
Here, the 3rd preset formula is
Wherein, Vac_rms is the alternating voltage virtual value of PFC power supplys, and Vac_peak is alternating voltage peak.
In the alternating voltage virtual value acquisition device of this PFC power supplys：First, running parameter acquisition module 100 obtains PFC electricity The current operating parameters in source.Then, the first crest voltage acquisition module 20 meets PFC electricity in the current operating parameters of PFC power supplys During the condition that the circuit of power factor correction 10 in source is closed, the circuit of power factor correction 10 of control PFC power supplys is closed, and according to The voltage at electrochemical capacitor C two ends obtains the first input ac voltage peak value of PFC power supplys；Second crest voltage acquisition module 300 During the condition that the circuit of power factor correction 10 for meeting PFC power supplys in the current operating parameters of PFC power supplys is opened, control PFC electricity Source is opened, and according to the second input ac voltage peak value of the input ac voltage instantaneous value of PFC power supplys acquisition PFC power supplys.Most Afterwards, virtual value computing module 400 is according to the first input ac voltage peak value or the second input ac voltage peak computational PFC electricity The alternating voltage virtual value in source.Because discontinuous conduct mode is only present near current zero-crossing point, and the technical program is in PFC During the condition that the circuit of power factor correction 10 that the current operating parameters of power supply meet PFC power supplys is opened, just according to PFC power supplys Input ac voltage instantaneous value obtains the second input ac voltage peak value of PFC power supplys, and calculates the alternating current of PFC power supplys accordingly It is pressed with valid value.Therefore, the technical program can avoid discontinuous conduct mode from obtaining result to the alternating voltage virtual value of PFC power supplys Interference, relative to prior art, technical solution of the present invention has the characteristics of accuracy is high.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the scope of the invention, it is every at this Under the inventive concept of invention, the equivalent structure transformation made using description of the invention and accompanying drawing content, or directly/use indirectly It is included in other related technical fields in the scope of patent protection of the present invention.

Claims (16)

1. the effective value-acquiring method of alternating voltage of a kind of PFC power supplys, it is characterised in that this method comprises the following steps：
S100, the current operating parameters for obtaining PFC power supplys；
S200, the PFC power supplys current operating parameters meet PFC power supplys circuit of power factor correction close condition When, the circuit of power factor correction of control PFC power supplys is closed, and obtains the voltage at the electrochemical capacitor two ends of PFC power supplys, Ran Hougen The first input ac voltage peak value of PFC power supplys is obtained according to the voltage at the electrochemical capacitor two ends；
S300, the PFC power supplys current operating parameters meet PFC power supplys circuit of power factor correction open condition When, control the circuit of power factor correction to open, and the input ac voltage instantaneous value of PFC power supplys is obtained, then according to institute State the second input ac voltage peak value that input ac voltage instantaneous value obtains PFC power supplys；
S400, according to the first input ac voltage peak value or the second input ac voltage peak computational PFC power supplys Alternating voltage virtual value.
2. the effective value-acquiring method of alternating voltage of PFC power supplys as claimed in claim 1, it is characterised in that the acquisition PFC The voltage at the electrochemical capacitor two ends of power supply, then obtains the first input of PFC power supplys according to the voltage at the electrochemical capacitor two ends Alternating voltage peak is specifically included：
The voltage at the electrochemical capacitor two ends of S210, collection in one voltage cycle of input ac power of PFC power supplys, and It is stored as multiple voltage sample samples；
S220, the voltage sample sample for obtaining magnitude of voltage maximum in multiple voltage sample samples；
S230, the magnitude of voltage according to the maximum voltage sample sample of magnitude of voltage and the first default calculation formula calculate PFC power supplys First input ac voltage peak value.
3. the effective value-acquiring method of alternating voltage of PFC power supplys as claimed in claim 2, it is characterised in that the power because Number correcting circuit is BOOST frameworks, and the described first default calculation formula is：
Vac_peak 1=Vdc_peak+Vfrd+Vbd；
Wherein, Vac_peak1 is the first input ac voltage peak value of PFC power supplys, and Vdc_peak is to be added in the electrochemical capacitor The maximum of both end voltage, Vfrd is the conduction voltage drop of fast recovery diode in the circuit of power factor correction, and Vbd is PFC The conduction voltage drop of rectifier bridge in power supply.
4. the effective value-acquiring method of alternating voltage of PFC power supplys as claimed in claim 1, it is characterised in that the acquisition PFC The input ac voltage instantaneous value of power supply, then obtains the second input of PFC power supplys according to the input ac voltage instantaneous value Alternating voltage peak is specifically included：
Power switch pipe opens in S310, the voltage at the detection electrochemical capacitor two ends, the acquisition circuit of power factor correction Pass cycle and the dutycycle of opening time, and, inductance is in the power switch pipe in the acquisition circuit of power factor correction A switch periods in current change quantity；
S320, the voltage according to the electrochemical capacitor two ends, the dutycycle of the power switch pipe opening time, the power are opened Close the current change quantity and second of the switch periods and the inductance of pipe in a switch periods of the power switch pipe Default calculation formula calculates the input ac voltage instantaneous value of PFC power supplys；
S330, in a voltage cycle of the input ac power of PFC power supplys, circulation performs the step S310 to S320, Until the input ac voltage instantaneous value for calculating the PFC power supplys obtained reaches n, the n is more than or equal to 2；
S340, the maximum obtained in the n input ac voltage instantaneous values, and it is used as the second input AC of PFC power supplys Voltage peak.
5. the effective value-acquiring method of alternating voltage of PFC power supplys as claimed in claim 4, it is characterised in that the power because Number correcting circuit is BOOST frameworks, and the described second default calculation formula is：
Vac=Vdc × (1-D)+Vigbt × D+Vfrd × (1-D)+Vbd+L × Δ Iin/Ts；
Wherein, Vac is the input ac voltage instantaneous value of PFC power supplys, and Vdc is the voltage for being added in the electrochemical capacitor two ends, and D is The dutycycle of power switch pipe opening time in the circuit of power factor correction, Vigbt is the conducting of the power switch pipe Pressure drop, Vfrd is the conduction voltage drop of fast recovery diode in the circuit of power factor correction, and Vbd is rectifier bridge in PFC power supplys Conduction voltage drop, L be the circuit of power factor correction in inductance inductance value, Δ Iin be the inductance opened in the power The current change quantity in a switch periods of pipe is closed, Ts is the switch periods of the power switch pipe.
6. the effective value-acquiring method of alternating voltage of PFC power supplys as claimed in claim 1, it is characterised in that described according to institute State the alternating voltage virtual value of the first input ac voltage peak value or the second input ac voltage peak computational PFC power supplys Specially：
The alternating voltage virtual value of PFC power supplys is calculated according to the first input ac voltage peak value and the 3rd preset formula；Or Person,
The alternating voltage virtual value of PFC power supplys is calculated according to the second input ac voltage peak value and the 3rd preset formula；
3rd preset formula is
Wherein, Vac_rms is the alternating voltage virtual value of PFC power supplys, and Vac_peak is alternating voltage peak.
7. the effective value-acquiring method of alternating voltage of PFC power supplys as claimed in claim 1, it is characterised in that the PFC power supplys Current operating parameters include：
The current power value for the load being connected with PFC power supplys, the present input current value of PFC power supplys and PFC power supplys it is current At least one of input current peak value three.
8. the effective value-acquiring method of alternating voltage of PFC power supplys as claimed in claim 7, it is characterised in that
The condition that the circuit of power factor correction that the current operating parameters of the PFC power supplys meet PFC power supplys is closed includes：
The current power value for the load being connected with PFC power supplys is less than default performance number, or, the current input electricity of PFC power supplys Flow valuve is less than default input current value, or, the present input current peak value of PFC power supplys is less than default input current peak Value；
The condition that the circuit of power factor correction that the current operating parameters of the PFC power supplys meet PFC power supplys is opened includes：
The current power value for the load being connected with PFC power supplys be more than or equal to default performance number, or, PFC power supplys work as Preceding input current value be more than or equal to default input current value, or, the present input current peak value of PFC power supplys be more than or Person is equal to default input current peak value.
9. a kind of alternating voltage virtual value acquisition device of PFC power supplys, it is characterised in that including：
Running parameter acquisition module, the current operating parameters for obtaining PFC power supplys；
First crest voltage acquisition module, the PFC for meeting PFC power supplys in the current operating parameters of PFC power supplys During the condition that circuit is closed, the circuit of power factor correction of control PFC power supplys is closed, and obtains the electrochemical capacitor two of PFC power supplys The voltage at end, then obtains the first input ac voltage peak value of PFC power supplys according to the voltage at the electrochemical capacitor two ends；
Second crest voltage acquisition module, the power factor for meeting PFC power supplys in the current operating parameters of the PFC power supplys During the condition that correcting circuit is opened, the circuit of power factor correction is controlled to open, and obtain the input ac voltage of PFC power supplys Instantaneous value, then obtains the second input ac voltage peak value of PFC power supplys according to the input ac voltage instantaneous value；
Virtual value computing module, for according to the first input ac voltage peak value or the second input ac voltage peak Value calculates the alternating voltage virtual value of PFC power supplys.
10. the alternating voltage virtual value acquisition device of PFC power supplys as claimed in claim 9, it is characterised in that the first peak Threshold voltage acquisition module includes：
Voltage acquisition unit, for gathering the electrochemical capacitor in one voltage cycle of input ac power of PFC power supplys The voltage at two ends, and it is stored as multiple voltage sample samples；
Maximum voltage acquiring unit, for obtaining the maximum voltage sample sample of magnitude of voltage in multiple voltage sample samples；
First crest voltage computing unit, it is pre-designed for the magnitude of voltage according to the maximum voltage sample sample of magnitude of voltage and first Calculate the first input ac voltage peak value that formula calculates PFC power supplys.
11. the alternating voltage virtual value acquisition device of PFC power supplys as claimed in claim 10, it is characterised in that the power Factor correcting circuit is BOOST frameworks, and the described first default calculation formula is：
Vac_peak 1=Vdc_peak+Vfrd+Vbd；
Wherein, Vac_peak1 is the first input ac voltage peak value of PFC power supplys, and Vdc_peak is to be added in the electrochemical capacitor The maximum of both end voltage, Vfrd is the conduction voltage drop of fast recovery diode in the circuit of power factor correction, and Vbd is PFC The conduction voltage drop of rectifier bridge in power supply.
12. the alternating voltage virtual value acquisition device of PFC power supplys as claimed in claim 9, it is characterised in that second peak Threshold voltage acquisition module includes：
Voltage detecting subelement, the voltage for detecting the electrochemical capacitor two ends；
State obtains subelement, for obtaining when the switch periods of power switch pipe and unlatching in the circuit of power factor correction Between dutycycle；
Inductive current obtains subelement, for obtaining inductance in the circuit of power factor correction one in the power switch pipe Current change quantity in individual switch periods；
Instantaneous voltage computing unit, for the voltage according to the electrochemical capacitor two ends, power switch pipe opening time Dutycycle, the switch periods of the power switch pipe and the inductance are in a switch periods of the power switch pipe Current change quantity and the second default calculation formula calculate the input ac voltage instantaneous values of PFC power supplys；
Maximum instantaneous voltage acquisition unit, in a voltage cycle of the input ac power in PFC power supplys, circulation to be obtained The input ac voltage instantaneous value of PFC power supplys, until the input ac voltage instantaneous value for calculating the PFC power supplys obtained reaches n, The n is more than or equal to 2；
Second crest voltage computing unit, for obtaining the maximum in the n input ac voltage instantaneous values, and conduct Second input ac voltage peak value of PFC power supplys.
13. the alternating voltage virtual value acquisition device of PFC power supplys as claimed in claim 12, it is characterised in that the power Factor correcting circuit is BOOST frameworks, and the described second default calculation formula is：
Vac=Vdc × (1-D)+Vigbt × D+Vfrd × (1-D)+Vbd+L × Δ Iin/Ts；
Wherein, Vac is the input ac voltage instantaneous value of PFC power supplys, and Vdc is the voltage for being added in the electrochemical capacitor two ends, and D is The dutycycle of power switch pipe opening time in the circuit of power factor correction, Vigbt is the conducting of the power switch pipe Pressure drop, Vfrd is the conduction voltage drop of fast recovery diode in the circuit of power factor correction, and Vbd is rectifier bridge in PFC power supplys Conduction voltage drop, L be the circuit of power factor correction in inductance inductance value, Δ Iin be the inductance opened in the power The current change quantity in a switch periods of pipe is closed, Ts is the switch periods of the power switch pipe.
14. the alternating voltage virtual value acquisition device of PFC power supplys as claimed in claim 9, it is characterised in that the virtual value Computing module specifically for：
The alternating voltage virtual value of PFC power supplys is calculated according to the first input ac voltage peak value and the 3rd preset formula；Or Person,
The alternating voltage virtual value of PFC power supplys is calculated according to the second input ac voltage peak value and the 3rd preset formula；
3rd preset formula is
Wherein, Vac_rms is the alternating voltage virtual value of PFC power supplys, and Vac_peak is alternating voltage peak.
15. the alternating voltage virtual value acquisition device of PFC power supplys as claimed in claim 9, it is characterised in that the PFC electricity The current operating parameters in source include：
The current power value for the load being connected with PFC power supplys, the present input current value of PFC power supplys and PFC power supplys it is current At least one of input current peak value three.
16. the alternating voltage virtual value acquisition device of PFC power supplys as claimed in claim 15, it is characterised in that
The condition that the circuit of power factor correction that the current operating parameters of the PFC power supplys meet PFC power supplys is closed includes：
The current power value for the load being connected with PFC power supplys is less than default performance number, or, the current input electricity of PFC power supplys Flow valuve is less than default input current value, or, the present input current of PFC power supplys is upright to be less than default input current peak Value；
The condition that the circuit of power factor correction that the current operating parameters of the PFC power supplys meet PFC power supplys is opened includes：
The current power value for the load being connected with PFC power supplys be more than or equal to default performance number, or, PFC power supplys work as Preceding input current value be more than or equal to default input current value, or, the present input current peak value of PFC power supplys be more than or Person is equal to default input current peak value.
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CN110311358A (en) * 2019-07-26 2019-10-08 广东美的制冷设备有限公司 Compressor control device and air conditioner
CN112698081A (en) * 2020-12-10 2021-04-23 北京大华无线电仪器有限责任公司 Current peak value factor calculation control method for alternating current sinusoidal load
CN116545248A (en) * 2023-06-28 2023-08-04 深圳市力生美半导体股份有限公司 Low-temperature starting method of switching power supply, charging pile and power supply equipment

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WO2018232818A1 (en) * 2017-06-21 2018-12-27 广东美的制冷设备有限公司 Method and device for obtaining effective value of alternating current voltage of pfc power supply
CN110311358A (en) * 2019-07-26 2019-10-08 广东美的制冷设备有限公司 Compressor control device and air conditioner
CN112698081A (en) * 2020-12-10 2021-04-23 北京大华无线电仪器有限责任公司 Current peak value factor calculation control method for alternating current sinusoidal load
CN116545248A (en) * 2023-06-28 2023-08-04 深圳市力生美半导体股份有限公司 Low-temperature starting method of switching power supply, charging pile and power supply equipment
CN116545248B (en) * 2023-06-28 2023-12-29 深圳市力生美半导体股份有限公司 Low-temperature starting method of switching power supply, charging pile and power supply equipment

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