CN105429451B - A kind of PFC inductance saturation suppression circuit, method and power-supply device - Google Patents
A kind of PFC inductance saturation suppression circuit, method and power-supply device Download PDFInfo
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- CN105429451B CN105429451B CN201510900608.4A CN201510900608A CN105429451B CN 105429451 B CN105429451 B CN 105429451B CN 201510900608 A CN201510900608 A CN 201510900608A CN 105429451 B CN105429451 B CN 105429451B
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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
- H02M1/4258—Arrangements for improving power factor of AC input using a single converter stage both for correction of AC input power factor and generation of a regulated and galvanically isolated DC output voltage
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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
- H02M1/32—Means for protecting converters other than automatic disconnection
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- 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 relates to a kind of PFC inductance saturation suppression circuit, method and power-supply device.The circuit includes PFC main power circuits, PFC inductive drops sample circuit, PFC inductive currents sample circuit and main control module.The present invention by detecting PFC inductance both end voltage and flowing through the size of PFC inductive currents in real time, and then PFC inductance values are extrapolated in real time, the degree of saturation of inductance is judged by PFC inductance value sizes, the size of PFC inductive currents is flowed through according to the control of inductance degree of saturation so as to achieve the purpose that to suppress PFC inductance saturations.The present invention only need to increase voltage detecting circuit in terms of hardware realization at PFC inductance both ends, remaining computing is calculated by software and realized, it is not required to increase other extra hardware costs, therefore compared with existing suppression PFC inductance saturation techniques, suppression PFC inductance saturation schemes proposed by the invention are easily achieved and cost will be greatly lowered.
Description
Technical field
The present invention relates to PFC power factor correction technologies field, more particularly to a kind of PFC inductance saturation suppression circuit, side
Method and power-supply device.
Background technology
When AC power through full-wave rectification and bulky capacitor filtering after, straight DC voltage is directly applied to all kinds of conversion
When on device and its load, although the waveform of input voltage is sine wave, the waveform of input current is burst pulse, thus is made
Line current contains a large amount of harmonic components, and is greatly lowered the power factor of converter.Such power-supply device is largely used,
Many undesirable consequences will be produced, substantial amounts of harmonic current causes power grid serious electromagnetic interference and harmonic pollution, influences
The normal operation of other equipment, causes line fault, or even damages equipment for power transmission and distribution；Low power factor makes power generation and power transmission and distribution
Construction cost and the operating cost increase of equipment, efficiency reduce.
In view of this, European Union, China, the U.S. and Japan have successively formulated the power factor standard of power-supply device, power because
Number index becomes a global mandatory provision.In order to make the power factor of power-supply device reach as defined in related standard
Index, adds active power factor correction (PFC) circuit, its principle usually between full-bridge rectifier and filter condenser
As shown in Figure 1.As shown in Figure 1, circuit of power factor correction is by an inductor L, switching tube S, rectifying tube D5, output filtered electrical
Capacitance E and main control MCU composition, the effect of circuit of power factor correction are solved, is by inspection of the main control MCU according to electric current and voltage
Measurement, the high-frequency drive pulse produced through simulation trial, comes the conducting and shut-off of controlling switch pipe, inductance is flowed through so as to control
The electric current of device, forces the waveform of the waveform and phase of AC power input current with input voltage to reach unanimity with phase, makes
Power factor is obtained close to 1, the amplitude and total harmonic distortion of certain input current each harmonic also significantly reduce therewith.
During PFC inductance is designed, according to the inductance value of theoretical calculation out, under steady-working state, PFC inductance
Generally will not saturation.But under abnormal environment, such as high-speed switch machine, frequently power-off etc., taken in PFC inductance and peripheral circuits
In the case of bad, the saturation of PFC inductance can be caused, cause the damage of power device in peripheral circuits.In order to suppress PFC electricity
The saturation of sense, prevents the damage of power device in pfc circuit, and the prior art mainly uses following two methods：1) selection is than reason
By the big magnetic core of the magnetic core specification calculated, increase surplus in the design of inductance in itself；2) power of specification bigger is selected
Device, but the increase cost that both the above method all can be larger.
The content of the invention
The technical problems to be solved by the invention are in view of the deficiencies of the prior art, there is provided a kind of PFC inductance saturation suppresses
Circuit, method and the power-supply device for including PFC inductance saturation suppression circuits.
The technical solution that the present invention solves above-mentioned technical problem is as follows：
A kind of PFC inductance saturation suppression circuit, including PFC main power circuits, PFC inductive drops sample circuit, PFC inductance
Current sampling circuit and main control module；The input terminal of the PFC main power circuits is connected with AC power, the connection of its output terminal
Load；
The PFC inductive drops sample circuit and the PFC inductive currents sample circuit are used for respectively detection PFC master in real time
The magnitude of voltage U at PFC inductance both ends in power circuitLWith the current value i for flowing through PFC inductanceL, and it is sent to main control module；
The main control module is used for according to magnitude of voltage ULWith current value iLPFC inductance value L are calculated in real time, and according to calculating
The PFC inductance values L gone out is compared with PFC inductance threshold values, when PFC inductance values L is more than or equal to PFC inductance threshold values, carries out just
Normal PFC operations control；Otherwise carry out inductance saturation and suppress control, the inductance saturation suppresses control and refers to according to PFC inductive currents
The pwm signal of driving PFC main power circuit switching tubes S is produced, the electric current for flowing through PFC inductance is less than current threshold, the electricity
Stream threshold value instigates the undersaturated critical value of PFC inductance.
A kind of power-supply device, it is characterised in that including the PFC inductance saturation suppression circuits described in above-mentioned technical proposal.
A kind of PFC inductance saturation suppressing method, includes the following steps：
S1, detects the magnitude of voltage U at PFC inductance both ends in PFC main power circuits in real timeLWith the current value for flowing through PFC inductance
iL；
S2, according to magnitude of voltage ULWith current value iLPFC inductance values L is calculated in real time；
S3, according to the PFC inductance values L calculated compared with PFC inductance threshold values, when PFC inductance values L is more than or equal to
During PFC inductance threshold values, normal PFC operations control is carried out；Otherwise carry out inductance saturation and suppress control, the inductance saturation suppresses control
System refers to the pwm signal that driving PFC main power circuit switching tubes S is produced according to PFC inductive currents, flows through the electric current of PFC inductance
Less than current threshold, the current threshold instigates the undersaturated critical value of PFC inductance.
The beneficial effects of the invention are as follows：
1) PFC inductance saturations are suppressed by monitoring the degree of saturation of PFC inductance in real time；
2) prevent the damage of switching device in PFC power circuits by suppressing the saturation of PFC inductance, increase circuit
Reliability；
3) only voltage detecting circuit need to be increased at PFC inductance both ends in terms of hardware realization, remaining computing passes through software meter
Calculate and realize, be not required to increase other extra hardware costs, therefore compared with existing suppression PFC inductance saturation techniques, institute of the present invention
The suppression PFC inductance saturation schemes of proposition are easily achieved and cost will be greatly lowered reduction PFC power circuit costs.
Brief description of the drawings
Fig. 1 is PFC (PFC) circuit diagram；
Fig. 2 is inductance magnetic linkage and current relationship curve；
Fig. 3 is one schematic diagram of the embodiment of the present invention；
Fig. 4 is two schematic diagram of the embodiment of the present invention
Fig. 5 is the main power of PFC of the present invention and sample circuit hardware elementary diagram；
Fig. 6 is PFC control principle drawings of the present invention；
Fig. 7 is PFC inductance saturation suppressing method flow chart of the present invention.
In attached drawing, parts list represented by the reference numerals is as follows：
1st, PFC main power circuits, 2, PFC inductive drop sample circuits, 3, PFC inductive current sample circuits, 4, main control
Module, 5, AC power, 6 loads, 7, PFC input voltage sample circuits, 8, PFC output voltage sampling circuits.
Embodiment
The principle and features of the present invention will be described below with reference to the accompanying drawings, and the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the present invention.
The present invention is pushed away in real time by detecting PFC inductance both end voltage in real time and flowing through the size of PFC inductive currents
PFC inductance values are calculated, the degree of saturation of inductance is judged by PFC inductance value sizes, PFC is flowed through according to the control of inductance degree of saturation
The size of inductive current is so as to achieve the purpose that to suppress PFC inductance saturations.The present invention only need to be in PFC inductance in terms of hardware realization
Both ends increase voltage detecting circuit, remaining computing is calculated by software and realized, is not required to increase other extra hardware costs, because
This compared with existing suppression PFC inductance saturation techniques, suppression PFC inductance saturation schemes proposed by the invention be easily achieved and
Cost will be greatly lowered.
The inductance of coil is defined as the magnetic as caused by interlinking with inductance coil the magnetic flux for flowing through induction coil current generation
Chain and the ratio for flowing through induction coil current, as shown in Equation 1：
L is coil inductance in formula；Ψ is the magnetic linkage produced by inductive current；iLFor induction coil current.
Fig. 2 show inductance magnetic linkage and current relationship curve, it can be seen from the figure that (i within the specific limitsL≤iLH),
Inductance magnetic linkage and electric current are approximately linear relationship, therefore inductance is approximately definite value in the range of this section of magnetic linkage-current curve；Work as iL
>iLHWhen, start non-linear relation occur between inductance magnetic linkage and electric current, with the increase of electric current, inductance starts to reduce, that is,
Inductance starts saturation occur, and electric current is bigger, and inductance degree of saturation is deeper, and inductance is smaller, below with reference to PFC principles map analysis electricity
Feel influence of the saturation to circuit.
PFC input voltages are u in Fig. 1in, output voltage uout, due to the switch of PFC switching tubes S in actual use
Frequency is more much higher than input power frequency, therefore in a switch periods, input voltage approximation is constant, when switching tube S is open-minded
When, inductive drop uL=uin, the inductive drop u when switching tube turns offL=uout-uin, PFC inductive drops and current relationship such as formula
(2) shown in：
From formula 2 as can be seen that inductive drop is constant, inductance reduces, and inductive current increased dramatically, and inductive current increased dramatically
The possibility of switching tube and diode damage can be increased, reduce the reliability of pfc circuit, therefore, should in the PFC courses of work
Inductance saturated phenomenon should be avoided as far as possible.
Discretization is carried out to formula 2, is obtained：
I in formulaL(n) it is PFC current time inductive current sampled values；iL(n-1) it is last moment inductive current sampled value；T
For the inductive current sampling period；uL(n) it is current time inductive drop sampled value.It can be obtained by formula 3, PFC inductance can be expressed as
Formula 4.
Only it is to be understood that PFC inductance current voltages sampled value, PFC inductance is current and last moment is electric it can be seen from formula 4
Flow sampled value and sampling period, it is possible to pick out PFC inductance values in real time, realize PFC inductance real time on-line monitorings.
As shown in figure 3, a kind of PFC inductance saturation suppression circuit, including the sampling of PFC main power circuits 1, PFC inductive drops
Circuit 2, PFC inductive currents sample circuit 3 and main control module 4；The input terminal of the PFC main power circuits 1 and AC power 5
Connection, its output terminal connection load 6；The PFC inductive drops sample circuit 2 and the PFC inductive currents sample circuit 3 are used for
Detect the magnitude of voltage U at PFC inductance both ends in PFC main power circuits 1 in real time respectivelyLWith the current value i for flowing through PFC inductanceL, concurrently
Give main control module 4；The main control module 4 is used for according to magnitude of voltage ULWith current value iLPFC inductance value L are calculated in real time, and
According to the PFC inductance values L calculated compared with PFC inductance threshold values, when PFC inductance values L is more than or equal to PFC inductance threshold values
When, carry out normal PFC operations control；Otherwise carry out inductance saturation and suppress control, the inductance saturation suppresses control and refers to according to PFC
Inductive current produces the pwm signal of 1 switching tube S of driving PFC main power circuits, and the electric current for flowing through PFC inductance is less than current threshold
Value, the current threshold instigate the undersaturated critical value of PFC inductance.
As shown in figure 4, above-mentioned technical proposal further includes PFC input voltages sample circuit 7 and PFC output voltage sampling circuits
8, the PFC input voltages sample circuit 7 and the PFC output voltage sampling circuits 8 are used for respectively the detection main power of PFC in real time
The input voltage value U of circuitacWith output voltage Udc, and it is sent to main control module.
The main control module 4 includes normal PFC operation control modules and PFC inductance saturation suppresses control module；
The normal PFC operation control modules, for the input voltage U according to PFC main power circuitsac, output voltage Udc
With PFC inductive currents iLNormal PFC operations control is carried out to the PFC main power circuits；
The PFC inductance saturation suppresses control module, for according to PFC inductive currents iLTo the PFC main power circuits
Carry out inductance saturation and suppress control.
The PFC inductance threshold value is the 80% of PFC inductance rated values.
As shown in figure 5, the PFC main power circuits 1 include rectification circuit, pfc circuit and electrolytic capacitor E, the PFC electricity
Road includes PFC inductance L, switching tube S and diode D5, and an output terminal of the rectification circuit passes through PFC inductance L connecting valves
The first end of pipe S, the other end connect the second end for the S that opens the light, and the first end of the pipe S that opens the light passes through diode D5 connections and is electrolysed electricity
Hold one end of E, the other end of the second end connection electrolytic capacitor E of switching tube S.
The PFC inductive drops sample circuit 2 uses differential voltage sample circuit, including resistance R7-R12, capacitance C6-
C10 and operational amplifier U2, the resistance R7's and resistance R9 concatenation operation amplifiers U2 that one end of the PFC inductance passes through series connection
Positive input terminal, the other end of PFC inductance connect the negative input of the operational amplifier U2 by the resistance R8 and resistance R10 of series connection
End connection, the common port of the resistance R7 and R9 are grounded by capacitance C7；The common port of the resistance R8 and R10 passes through capacitance C6
Ground connection, the positive input terminal of the operational amplifier U2 meet power supply Vref by resistance R12 and capacitance C8 in parallel, and the computing is put
The negative input end of big device U2 connects the output terminal of operational amplifier U2, the operational amplifier by parallel resistance R11 and capacitance C9
The output terminal of U2 is grounded by capacitance C10.The power sense circuit can add resistance form using common operational amplifier
The differential voltage sample circuit of composition, makes that scheme is easily achieved and cost will further decrease.
The PFC inductive currents sample circuit 3 includes resistance R13- resistance R19, capacitance C11-C15 and operational amplifier
U3, the resistance R13 are series between the rectification circuit and pfc circuit, the resistance that one end of the resistance R13 passes through series connection
The positive input terminal of R14 and resistance R16 concatenation operation amplifiers U3, the resistance R15 and resistance that the other end of resistance R13 passes through series connection
The negative input end of R17 concatenation operation amplifiers U3, the common port of the resistance R14 and resistance R16 are grounded by capacitance C12, institute
The common port for stating resistance R15 and resistance R17 is grounded by capacitance C11, and the positive input terminal of the operational amplifier U3 passes through parallel connection
Resistance R18 and capacitance C15 connect the negative input end of power supply Vref, the operational amplifier U3 and pass through in parallel resistance R19 and electricity
Hold the output terminal of C13 concatenation operation amplifiers U3, the output terminal of the operational amplifier U3 is grounded by capacitance C14.
The PFC input voltages sample circuit 4 includes resistance R1-R6, capacitance C1-C5 and operational amplifier U1, the friendship
The positive input terminal of resistance R2 and resistance R3 concatenation operation amplifiers U1 that one output terminal in galvanic electricity source passes through series connection, another is defeated
The negative input end of resistance R1 and resistance R4 concatenation operation amplifiers U1 that outlet passes through series connection, the common port of the resistance R1 and R4
It is grounded by capacitance C1；The common port of the resistance R2 and R3 is grounded by capacitance C2, the positive input of the operational amplifier U1
End meets power supply Vref by resistance R5 and capacitance C5 in parallel, and the negative input end of the operational amplifier U2 passes through parallel resistance R6
A capacitance C3 connects the output terminal of operational amplifier U1, and the output terminal of the operational amplifier U1 is grounded by capacitance C4；
The PFC output voltage sampling circuits 5 include resistance R20-R21 and capacitance C16, the resistance R20 and resistance R21
It is connected between two output terminals of the PFC main power circuits, the common port of the resistance R20 and resistance R21 pass through series connection
Resistance R22 and capacitance C16 ground connection.
As shown in fig. 6, the normal PFC operation control modules include：Voltage error calculator, for PFC to be exported electricity
Pressure instructionWith actual output voltage UdcCarry out seeking difference operation, difference signal is sent to voltage regulator；Voltage regulator,
For producing inductive current instruction amplitude according to difference signalAnd it is sent to synthesizer；Synthesizer, for according to input electricity
Press phase and PFC inductive currents instruction amplitudeCombination inductance current instruction valueWherein input voltage phase passes through the main work(of PFC
The input voltage U of rate circuitacDivided by its amplitude UacMIt is calculated；First current error calculator, for inductive current to be instructed
ValueWith actual inductive current value iLCarry out seeking difference operation, difference signal is sent to the first current regulator；First current regulation
Device, for producing modulated signal according to difference signal, and is sent to the first impulse generator；First impulse generator, for root
The pwm signal of driving switch pipe S is produced according to the modulated signal, PFC inductive currents is followed inductive current command valuePass through
The real-time voltage at PDC inductance both ends calculates the real-time inductance value of PFC with the real-time current for flowing through PFC inductance, according to PFC inductance
Value judges whether it is in saturation state, if unsaturated state is in, according to pfc circuit input voltage, output voltage and electricity
The actual current of sense produces the pwm signal of driving switch pipe S, and pfc circuit is normally controlled.
The PFC inductance saturation, which suppresses control module, to be included：Inductive current command value calculator, for current PFC electricity
Electrification flow valuve iL90% be used as inductive current command valueSecond current error calculator, for by inductive current command value
With actual inductive current value iLCarry out seeking difference operation, difference signal is sent to the second current regulator；Second current regulator,
For producing modulated signal according to difference signal, and it is sent to the second impulse generator；Second impulse generator, for according to institute
The pwm signal that modulated signal produces driving switch pipe S is stated, PFC inductive currents is followed inductive current command valuePass through PDC
The real-time voltage at inductance both ends calculates the real-time inductance value of PFC with the real-time current for flowing through PFC inductance, according to PFC inductance values
Judge whether it is in saturation state, if being in saturation state, driving switch pipe S is produced according to the actual current of PFC inductance
Pwm signal, PFC inductance is exited saturation state.Scheme is simple and practicable, real-time.
A kind of power-supply device, it is characterised in that including the PFC inductance saturation suppression circuits described in above-mentioned technical proposal.
As shown in fig. 7, a kind of PFC inductance saturation suppressing method, includes the following steps：
S1, detects the magnitude of voltage U at PFC inductance both ends in PFC main power circuits in real timeLWith the current value for flowing through PFC inductance
iL；
S2, according to magnitude of voltage ULWith current value iLPFC inductance values L is calculated in real time；
S3, according to the PFC inductance values L calculated compared with PFC inductance threshold values, when PFC inductance values L is more than or equal to
During PFC inductance threshold values, normal PFC operations control is carried out；Otherwise carry out inductance saturation and suppress control, the inductance saturation suppresses control
System refers to the pwm signal that driving PFC main power circuit switching tubes S is produced according to PFC inductive currents, flows through the electric current of PFC inductance
Less than current threshold, the current threshold instigates the undersaturated critical value of PFC inductance.
Step S1 further includes the input voltage value U of detection PFC main power circuits in real timeacWith output voltage Udc；
Step S3's is implemented as：
S3.1：By the PFC inductance values L calculated in real time compared with PFC inductance threshold values, when PFC inductance values L be more than etc.
When PFC inductance threshold values, S3.2 is performed, when PFC inductance values L is less than PFC inductance threshold values, performs S3.3；
S3.2, according to the input voltage U of PFC main power circuitsac, output voltage UdcWith PFC inductive currents iLTo the PFC
Main power circuit is controlled；
S3.3 is according to PFC inductive currents iLThe PFC main power circuits are controlled.
The PFC inductance threshold value is the 80% of PFC inductance rated values.
Step S3.2's is implemented as：
S3.2.1, PFC output voltages are instructedWith actual output voltage UdcCarry out seeking difference operation；
S3.2.2, inductive current instruction amplitude is produced according to difference signal
S3.2.3, amplitude is instructed according to input voltage phase and PFC inductive currentsCombination inductance current instruction valueIts
The input voltage U that middle input voltage phase passes through PFC main power circuitsacDivided by its amplitude UacMIt is calculated；
S3.2.4, by inductive current command valueWith actual inductive current value iLCarry out seeking difference operation；
S3.2.5, modulated signal is produced according to difference signal；
S3.2.6, the pwm signal of driving switch pipe S is produced according to the modulated signal, PFC inductive currents is followed inductance
Current instruction value
Step S3.3's is implemented as：
S3.3.1, with current PFC inductor current values iL90% be used as inductive current command value
S3.3.2, by inductive current command valueWith actual inductive current value iLCarry out seeking difference operation；
S3.3.3, modulated signal is produced according to difference signal；
S3.3.4, the pwm signal of driving switch pipe S is produced according to the modulated signal, PFC inductive currents is followed inductance
Current instruction value
The present invention calculates PFC inductance values in real time using PFC inductive drops current signal, and inductance value and volume are calculated according to PFC
Determine the working status that inductance value is compared and then judges PFC inductance, carried out if PFC inductance works in unsaturated state normal
PFC operation control；Carried out if PFC inductance works in saturation state inductance saturation suppress control, until PFC inductance exit it is full
Then system enters real-time online saturation suppression of the normal PFC operations control so as to fulfill PFC inductance with state, with existing suppression
PFC inductance saturation technique processed is compared, and scheme cost of the present invention will be greatly lowered, and be easily achieved.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent replacement, improvement and so on, should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of PFC inductance saturation suppression circuit, it is characterised in that sampled including PFC main power circuits (1), PFC inductive drops
Circuit (2), PFC inductive currents sample circuit (3) and main control module (4)；The input terminal of the PFC main power circuits (1) with
AC power (5) connects, its output terminal connection load (6)；
The PFC main power circuits (1) include rectification circuit, pfc circuit and electrolytic capacitor E；
The PFC inductive drops sample circuit (2) and the PFC inductive currents sample circuit (3) are used for respectively detection PFC in real time
The magnitude of voltage U at PFC inductance both ends in main power circuit (1)LWith the current value i for flowing through PFC inductanceL, and it is sent to main control module
(4)；
The main control module (4) is used for according to magnitude of voltage ULWith current value iLPFC inductance value L are calculated in real time, and according to calculating
PFC inductance values L compared with PFC inductance threshold values, when PFC inductance values L is more than or equal to PFC inductance threshold values, carry out normal
PFC operation controls；Otherwise carry out inductance saturation and suppress control, the inductance saturation suppresses control and refers to according to the production of PFC inductive currents
The pwm signal of raw driving PFC main power circuits (1) switching tube S, the electric current for flowing through PFC inductance are less than current threshold, the electricity
Stream threshold value instigates the undersaturated critical value of PFC inductance.
2. a kind of PFC inductance saturation suppression circuit according to claim 1, it is characterised in that further include PFC input voltages and adopt
Sample circuit (7) and PFC output voltage sampling circuits (8), the PFC input voltages sample circuit (7) and the PFC output voltages
Sample circuit (8) is used for respectively the input voltage value U of detection PFC main power circuits in real timeacWith output voltage Udc, and be sent to
Main control module；
The main control module (4) includes normal PFC operation control modules and PFC inductance saturation suppresses control module；
The normal PFC operation control modules, for the input voltage U according to PFC main power circuitsac, output voltage UdcAnd PFC
Inductive current iLNormal PFC operations control is carried out to the PFC main power circuits；
The PFC inductance saturation suppresses control module, for according to PFC inductive currents iLElectricity is carried out to the PFC main power circuits
Feel saturation and suppress control.
A kind of 3. PFC inductance saturation suppression circuit according to claim 1 or claim 2, it is characterised in that；The PFC inductance threshold value
For the 80% of PFC inductance rated values.
A kind of 4. PFC inductance saturation suppression circuit according to claim 2, it is characterised in that
The normal PFC operation control modules include：
Voltage error calculator, for PFC output voltages to be instructedWith actual output voltage UdcCarry out seeking difference operation, by difference
Signal is sent to voltage regulator；
Voltage regulator, for producing inductive current instruction amplitude according to difference signalAnd it is sent to synthesizer；
Synthesizer, for instructing amplitude according to input voltage phase and PFC inductive currentsCombination inductance current instruction valueIts
The input voltage U that middle input voltage phase passes through PFC main power circuitsacDivided by its amplitude UacMIt is calculated；
First current error calculator, for by inductive current command valueWith actual inductive current value iLCarry out seeking difference operation, will
Difference signal is sent to the first current regulator；
First current regulator, for producing modulated signal according to difference signal, and is sent to the first impulse generator；
First impulse generator, for producing the pwm signal of driving switch pipe S according to the modulated signal, makes PFC inductive currents
Follow inductive current command value
The PFC inductance saturation, which suppresses control module, to be included：
Inductive current command value calculator, for current PFC inductor current values iL90% be used as inductive current command value
Second current error calculator, for by inductive current command valueWith actual inductive current value iLCarry out seeking difference operation, will
Difference signal is sent to the second current regulator；
Second current regulator, for producing modulated signal according to difference signal, and is sent to the second impulse generator；
Second impulse generator, for producing the pwm signal of driving switch pipe S according to the modulated signal, makes PFC inductive currents
Follow inductive current command value
A kind of 5. PFC inductance saturation suppression circuit according to claim 1, it is characterised in that the PFC inductive drops sampling
Circuit (2) uses differential voltage sample circuit, including resistance R7-R12, capacitance C6-C10 and operational amplifier U2, the PFC electricity
The positive input terminal of resistance R7 and resistance R9 concatenation operation amplifiers U2 that one end of sense passes through series connection, the other end of PFC inductance lead to
The resistance R8 for crossing series connection connects the negative input end of the operational amplifier U2, the common port of the resistance R7 and R9 with resistance R10
It is grounded by capacitance C7；The common port of the resistance R8 and R10 is grounded by capacitance C6, the positive input of the operational amplifier U2
End meets power supply Vref by resistance R12 and capacitance C8 in parallel, and the negative input end of the operational amplifier U2 passes through parallel resistance
R11 and capacitance C9 connects the output terminal of operational amplifier U2, and the output terminal of the operational amplifier U2 is grounded by capacitance C10；
The PFC inductive currents sample circuit (3) includes resistance R13- resistance R19, capacitance C11-C15 and operational amplifier U3,
The resistance R13 is series between the rectification circuit and pfc circuit, the resistance R14 that one end of the resistance R13 passes through series connection
The resistance R15 and resistance R17 for passing through series connection with the positive input terminal of resistance R16 concatenation operation amplifiers U3, the other end of resistance R13
The negative input end of concatenation operation amplifier U3, the common port of the resistance R14 and resistance R16 are grounded by capacitance C12, the electricity
The common port of resistance R15 and resistance R17 is grounded by capacitance C11, and the positive input terminal of the operational amplifier U3 passes through electricity in parallel
The negative input end that resistance R18 and capacitance C15 meets power supply Vref, the operational amplifier U3 passes through resistance R19 and capacitance C13 in parallel
The output terminal of concatenation operation amplifier U3, the output terminal of the operational amplifier U3 are grounded by capacitance C14.
6. a kind of power-supply device, it is characterised in that including claim 1-5 any one of them PFC inductance saturation suppression circuits.
7. a kind of PFC inductance saturation suppressing method, it is characterised in that include the following steps：
S1, detects the magnitude of voltage U at PFC inductance both ends in PFC main power circuits in real timeLWith the current value i for flowing through PFC inductanceL；
S2, according to magnitude of voltage ULWith current value iLPFC inductance values L is calculated in real time；
S3, according to the PFC inductance values L calculated compared with PFC inductance threshold values, when PFC inductance values L is more than or equal to PFC electricity
When feeling threshold value, normal PFC operations control is carried out；Otherwise carry out inductance saturation and suppress control, the inductance saturation suppresses control and refers to
The pwm signal of driving PFC main power circuit switching tubes S is produced according to PFC inductive currents, the electric current for flowing through PFC inductance is less than
Current threshold, the current threshold instigate the undersaturated critical value of PFC inductance.
A kind of 8. PFC inductance saturation suppressing method according to claim 7, it is characterised in that
Step S1 further includes the input voltage value U of detection PFC main power circuits in real timeacWith output voltage Udc；
Step S3's is implemented as：
S3.1：By the PFC inductance values L calculated in real time compared with PFC inductance threshold values, when PFC inductance values L is more than or equal to
During PFC inductance threshold values, S3.2 is performed, when PFC inductance values L is less than PFC inductance threshold values, performs S3.3；
S3.2, according to the input voltage U of PFC main power circuitsac, output voltage UdcWith PFC inductive currents iLTo the main work(of the PFC
Rate circuit is controlled；
S3.3 is according to PFC inductive currents iLThe PFC main power circuits are controlled.
9. according to a kind of PFC inductance saturation suppressing method of claim 7 or 8, the PFC inductance threshold value is PFC inductance volumes
The 80% of definite value.
A kind of 10. PFC inductance saturation suppressing method according to claim 8, it is characterised in that
Step S3.2's is implemented as：
S3.2.1, PFC output voltages are instructedWith actual output voltage UdcCarry out seeking difference operation；
S3.2.2, inductive current instruction amplitude is produced according to difference signal
S3.2.3, amplitude is instructed according to input voltage phase and PFC inductive currentsCombination inductance current instruction valueIt is wherein defeated
Enter input voltage U of the voltage-phase by PFC main power circuitsacDivided by its amplitude UacMIt is calculated；
S3.2.4, by inductive current command valueWith actual inductive current value iLCarry out seeking difference operation；
S3.2.5, modulated signal is produced according to difference signal；
S3.2.6, the pwm signal of driving switch pipe S is produced according to the modulated signal, PFC inductive currents is followed inductive current
Command value
Step S3.3's is implemented as：
S3.3.1, with current PFC inductor current values iL90% be used as inductive current command value
S3.3.2, by inductive current command valueWith actual inductive current value iLCarry out seeking difference operation；
S3.3.3, modulated signal is produced according to difference signal；
S3.3.4, the pwm signal of driving switch pipe S is produced according to the modulated signal, PFC inductive currents is followed inductive current
Command value
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| CN105911416B (en) * | 2016-05-27 | 2019-05-31 | 广东美的制冷设备有限公司 | The method for diagnosing faults and device of PFC pfc circuit |
| CN105811791B (en) * | 2016-05-27 | 2018-07-13 | 广东美的制冷设备有限公司 | PFC pfc circuit and its inductance discrimination method and device |
| CN105929248B (en) * | 2016-05-27 | 2019-01-29 | 广东美的制冷设备有限公司 | The inductance repair method and device of power factor corrector on electric-controlled plate |
| CN105871235B (en) * | 2016-05-27 | 2018-09-11 | 广东美的制冷设备有限公司 | PFC pfc circuit and its inductance discrimination method and device |
| JP2020088978A (en) * | 2018-11-20 | 2020-06-04 | 株式会社日立産機システム | Electric power conversion device |
| CN111641334B (en) * | 2020-06-05 | 2021-11-23 | 广东美的制冷设备有限公司 | Variable frequency control device and air conditioner |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101640421A (en) * | 2008-07-28 | 2010-02-03 | 艾默生网络能源系统北美公司 | Alternating current input voltage sampling circuit, sampling method and bridgeless PFC circuit |
| CN102270932A (en) * | 2010-06-04 | 2011-12-07 | 凌力尔特有限公司 | DC/DC converter with magnetic flux density limits |
| CN103018575A (en) * | 2012-12-05 | 2013-04-03 | 合肥工业大学 | High-power inductance testing device, main circuit thereof and testing method thereof |
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| TW201511455A (en) * | 2013-09-10 | 2015-03-16 | Hon Hai Prec Ind Co Ltd | Power supply |
| CN104578731A (en) * | 2015-01-26 | 2015-04-29 | 湖南城市学院 | Harmonic suppression double closed loop control circuit and harmonic suppression device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101640421A (en) * | 2008-07-28 | 2010-02-03 | 艾默生网络能源系统北美公司 | Alternating current input voltage sampling circuit, sampling method and bridgeless PFC circuit |
| CN102270932A (en) * | 2010-06-04 | 2011-12-07 | 凌力尔特有限公司 | DC/DC converter with magnetic flux density limits |
| CN103018575A (en) * | 2012-12-05 | 2013-04-03 | 合肥工业大学 | High-power inductance testing device, main circuit thereof and testing method thereof |
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