CN105429451A - PFC inductor saturation suppression circuit and method and power equipment - Google Patents
PFC inductor saturation suppression circuit and method and power equipment Download PDFInfo
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- CN105429451A CN105429451A CN201510900608.4A CN201510900608A CN105429451A CN 105429451 A CN105429451 A CN 105429451A CN 201510900608 A CN201510900608 A CN 201510900608A CN 105429451 A CN105429451 A CN 105429451A
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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
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Abstract
The invention relates to a PFC inductor saturation suppression circuit and method and power equipment. The circuit comprises a PFC main power circuit, a PFC inductor voltage sampling circuit, a PFC inductor current sampling circuit and a main control module. A PFC inductor value is calculated in real time by detecting voltages at two ends of a PFC inductor and the magnitude of a current which flows through the PFC inductor in real time; the saturation degree of the inductor is judged through the size of the PFC inductor value; and the magnitude of the current which flows through the PFC inductor is controlled according to the inductor saturation degree, so that the target of suppressing PFC inductor saturation is achieved. Only voltage detection circuits are added to two ends of the PFC inductor in the hardware realization aspect; the other operations are achieved through software calculation; and the extra hardware cost does not need to increase. Therefore, compared with an existing PFC inductor saturation suppression technology, the PFC inductor saturation suppression scheme provided by the invention is easy to achieve; and the cost is greatly reduced.
Description
Technical field
The present invention relates to PFC power factor correction technology field, particularly relate to the saturated suppression circuit of a kind of PFC inductance, method and power-supply device.
Background technology
When AC power is after full-wave rectification and bulky capacitor filtering, when straight direct voltage is directly put in each quasi-converter and load thereof, although the waveform of input voltage is sinusoidal wave, but the waveform of input current is but burst pulse, thus make line current contain a large amount of harmonic component, and the power factor of converter is greatly reduced.The power-supply device that a large amount of use is such, will produce many bad consequences, a large amount of harmonic currents causes serious electromagnetic interference and harmonic pollution to electrical network, affects the normal operation of other equipment, causes line fault, even make equipment for power transmission and distribution damage; Low power factor makes the construction cost of generating and equipment for power transmission and distribution and operating cost increase, and efficiency reduces.
In view of this, European Union, China, the U.S. and Japan have successively formulated the power factor standard of power-supply device, and power factor specification is becoming a global mandatory provision.In order to make the power factor of power-supply device reach related standards set quota, between full-bridge rectifier and filtering capacitor, usually add Active Power Factor Correction (PFC) circuit, its principle 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 filtering electrochemical capacitor E and main control MCU composition, the effect of circuit of power factor correction, it is the detection limit relying on main control MCU foundation electric current and voltage, the high-frequency drive pulse produced through simulation trial, come conducting and the shutoff of control switch pipe, thus control flow check is through the electric current of inductor, the waveform of AC power input current and phase place is forced all to reach unanimity with the waveform of input voltage and phase place, make power factor close to 1, amplitude and the total harmonic distortion of certain input current each harmonic also significantly reduce thereupon.
In design PFC inductance process, according to theory calculate inductance value out, under steady-working state, PFC inductance generally can not be saturated.But under abnormal environment, such as fast open shutdown, frequent power-off etc., when PFC inductance and peripheral circuits are arranged in pairs or groups bad, can cause the saturated of PFC inductance, cause the damage of power device in peripheral circuits.In order to suppress the saturated of PFC inductance, prevent the damage of power device in pfc circuit, prior art mainly adopts following two kinds of methods: the magnetic core that 1) Selection radio theory calculate magnetic core specification is out large, the design of inductance itself increases surplus; 2) power device selecting specification larger, but the increase cost that above two kinds of methods all can be larger.
Summary of the invention
Technical problem to be solved by this invention is for the deficiencies in the prior art, provides a kind of PFC inductance saturated suppression circuit, method and comprises the power-supply device of the saturated suppression circuit of PFC inductance.
The technical scheme that the present invention solves the problems of the technologies described above is as follows:
The saturated suppression circuit of a kind of PFC inductance, comprises PFC main power circuit, PFC inductive drop sample circuit, PFC inductive current sample circuit and main control module; The input of described PFC main power circuit is connected with AC power, and its output connects load;
Described PFC inductive drop sample circuit and described PFC inductive current sample circuit are used for the magnitude of voltage U detecting PFC inductance two ends in PFC main power circuit respectively in real time
lwith the current value i flowing through PFC inductance
l, and send to main control module;
Described main control module is used for according to magnitude of voltage U
lwith current value i
lreal-time calculating PFC inductance value L, and compare according to the PFC inductance value L calculated and PFC inductance threshold value, when PFC inductance value L is more than or equal to PFC inductance threshold value, carries out normal PFC and run control; Otherwise carry out the saturated inhibitory control of inductance, the saturated inhibitory control of described inductance refers to produce according to PFC inductive current the pwm signal driving PFC main power circuit switching tube S, make the electric current flowing through PFC inductance lower than current threshold, described current threshold instigates the undersaturated critical value of PFC inductance.
A kind of power-supply device, is characterized in that, comprise the saturated suppression circuit of PFC inductance described in technique scheme.
The saturated suppressing method of a kind of PFC inductance, comprises the steps:
S1, detects the magnitude of voltage U at PFC inductance two ends in PFC main power circuit in real time
lwith the current value i flowing through PFC inductance
l;
S2, according to magnitude of voltage U
lwith current value i
lreal-time calculating PFC inductance value L;
S3, compares according to the PFC inductance value L calculated and PFC inductance threshold value, when PFC inductance value L is more than or equal to PFC inductance threshold value, carries out normal PFC and runs control; Otherwise carry out the saturated inhibitory control of inductance, the saturated inhibitory control of described inductance refers to produce according to PFC inductive current the pwm signal driving PFC main power circuit switching tube S, make the electric current flowing through PFC inductance lower than current threshold, described current threshold instigates the undersaturated critical value of PFC inductance.
The invention has the beneficial effects as follows:
1) suppress PFC inductance saturated by the degree of saturation of Real-Time Monitoring PFC inductance;
2) by suppressing the saturated of PFC inductance thus preventing the damage of PFC power circuit breaker in middle device, the reliability of circuit is increased;
3) hardware implementing aspect only need increase voltage detecting circuit at PFC inductance two ends, all the other computings are all calculated by software and realize, do not need to increase other extra hardware costs, therefore suppress compared with PFC inductance saturation technique with existing, the saturated scheme of suppression PFC inductance proposed by the invention is easy to realize and cost will greatly reduce PFC power circuit cost.
Accompanying drawing explanation
Fig. 1 is power factor correction (PFC) circuit theory diagrams;
Fig. 2 is inductance magnetic linkage and current relationship curve;
Fig. 3 is the embodiment of the present invention one schematic diagram;
Fig. 4 is the embodiment of the present invention two schematic diagram
Fig. 5 is the main power of PFC of the present invention and sample circuit hardware elementary diagram;
Fig. 6 is PFC control principle drawing of the present invention;
Fig. 7 is the saturated suppressing method flow chart of PFC inductance of the present invention.
In accompanying drawing, the list of parts representated by each label is as follows:
1, PFC main power circuit, 2, PFC inductive drop sample circuit, 3, PFC inductive current sample circuit, 4, main control module, 5, AC power, 6 loads, 7, PFC input voltage sample circuit, 8, PFC output voltage sampling circuit.
Embodiment
Be described principle of the present invention and feature below in conjunction with accompanying drawing, example, only for explaining the present invention, is not intended to limit scope of the present invention.
The present invention is by detecting PFC inductance both end voltage in real time and flowing through the size of PFC inductive current, and then extrapolate PFC inductance value in real time, judged the degree of saturation of inductance by PFC inductance value size, reach through the size of PFC inductive current the object suppressing PFC inductance saturated according to inductance degree of saturation control flow check.The present invention only need increase voltage detecting circuit at PFC inductance two ends in hardware implementing, all the other computings are all calculated by software and realize, do not need to increase other extra hardware costs, therefore suppress compared with PFC inductance saturation technique with existing, the saturated scheme of suppression PFC inductance proposed by the invention is easy to realize and cost will greatly reduce.
The inductance of coil is defined as by the magnetic flux and inductance coil the interlinkage magnetic linkage produced and the ratio flowing through induction coil current that flow through induction coil current generation, as shown in Equation 1:
In formula, L is coil inductance; Ψ is the magnetic linkage produced by inductive current; i
lfor induction coil current.
Figure 2 shows that inductance magnetic linkage and current relationship curve, as can be seen from the figure, (i within the specific limits
l≤ i
lH), inductance magnetic linkage and electric current are approximately linear relationship, are therefore approximately definite value in this section of magnetic linkage-current curve scope internal inductance; Work as i
l>i
lHtime, start to occur non-linear relation between inductance magnetic linkage and electric current, along with the increase of electric current, inductance starts to reduce, and namely inductance starts to occur saturated, and electric current is larger, inductance degree of saturation is darker, and inductance is less, analyzes the saturated impact on circuit of inductance below with reference to PFC schematic diagram.
In Fig. 1, PFC input voltage is u
in, output voltage is u
out, because in actual use procedure, the switching frequency of PFC switching tube S is more much higher than input power frequency, therefore in a switch periods, input voltage is similar to constant, when switching tube S opens, and inductive drop u
l=u
in, the inductive drop u when switching tube turns off
l=u
out-u
in, PFC inductive drop and current relationship are such as formula shown in (2):
As can be seen from formula 2, inductive drop is constant, and inductance reduces, inductive current sharply increases, and inductive current sharply increases the possibility that can increase switching tube and diode damage, reduces the reliability of pfc circuit, therefore, inductance saturated phenomenon should be avoided in the PFC course of work as far as possible.
Discretization is carried out to formula 2:
I in formula
ln () is PFC current time inductive current sampled value; i
l(n-1) be a upper moment inductive current sampled value; T is the inductive current sampling period; u
ln () is current time inductive drop sampled value.Can be obtained by formula 3, PFC inductance can represent an accepted way of doing sth 4.
As can be seen from formula 4, as long as knew PFC inductance current voltage sampled value, PFC inductance current and upper moment current sampling data and sampling period, just can be real-time pick out PFC inductance value, realize PFC inductance real time on-line monitoring.
As shown in Figure 3, the saturated suppression circuit of a kind of PFC inductance, comprises PFC main power circuit 1, PFC inductive drop sample circuit 2, PFC inductive current sample circuit 3 and main control module 4; The input of described PFC main power circuit 1 is connected with AC power 5, and its output connects load 6; Described PFC inductive drop sample circuit 2 and described PFC inductive current sample circuit 3 are for detecting the magnitude of voltage U at PFC inductance two ends in PFC main power circuit 1 respectively in real time
lwith the current value i flowing through PFC inductance
l, and send to main control module 4; Described main control module 4 is for according to magnitude of voltage U
lwith current value i
lreal-time calculating PFC inductance value L, and compare according to the PFC inductance value L calculated and PFC inductance threshold value, when PFC inductance value L is more than or equal to PFC inductance threshold value, carries out normal PFC and run control; Otherwise carry out the saturated inhibitory control of inductance, the saturated inhibitory control of described inductance refers to produce according to PFC inductive current the pwm signal driving PFC main power circuit 1 switching tube S, make the electric current flowing through PFC inductance lower than current threshold, described current threshold instigates the undersaturated critical value of PFC inductance.
As shown in Figure 4, technique scheme also comprises PFC input voltage sample circuit 7 and PFC output voltage sampling circuit 8, and described PFC input voltage sample circuit 7 and described PFC output voltage sampling circuit 8 are for detecting the input voltage value U of PFC main power circuit respectively in real time
acwith output voltage U
dc, and send to main control module.
Described main control module 4 comprises normal PFC operation control module and the saturated inhibitory control module of PFC inductance;
Described normal PFC operation control module, for the input voltage U according to PFC main power circuit
ac, output voltage U
dcwith PFC inductive current i
lnormal PFC is carried out to described PFC main power circuit and runs control;
The saturated inhibitory control module of described PFC inductance, for according to PFC inductive current i
lthe saturated inhibitory control of inductance is carried out to described PFC main power circuit.
Described PFC inductance threshold value is 80% of PFC inductance rated value.
As shown in Figure 5, described PFC main power circuit 1 comprises rectification circuit, pfc circuit and electrochemical capacitor E, described pfc circuit comprises PFC inductance L, switching tube S and diode D5, an output of described rectification circuit passes through the first end of PFC inductance L connecting valve pipe S, the other end connects second end of the S that opens the light, the first end of the described pipe S that opens the light connects one end of electrochemical capacitor E by diode D5, second end of switching tube S connects the other end of electrochemical capacitor E.
Described PFC inductive drop sample circuit 2 adopts differential voltage sample circuit, comprise resistance R7-R12, electric capacity C6-C10 and op-amp U2, the resistance R7 of one end by series connection of described PFC inductance and the positive input terminal of resistance R9 concatenation operation amplifier U2, the other end of PFC inductance to be connected described operational amplifier U2 by the resistance R8 of series connection negative input end with resistance R10 connects, and the common port of described resistance R7 and R9 is by electric capacity C7 ground connection; The common port of described resistance R8 and R10 is by electric capacity C6 ground connection, the positive input terminal of described operational amplifier U2 meets power supply Vref by resistance R12 in parallel and electric capacity C8, the negative input end of described operational amplifier U2 connects the output of operational amplifier U2 by parallel resistance R11 electric capacity C9, the output of described operational amplifier U2 is by electric capacity C10 ground connection.Described power sense circuit can adopt conventional operational amplifier add resistance form composition differential voltage sample circuit, make scheme be easy to realize and also cost will reduce further.
Described PFC inductive current sample circuit 3 comprises resistance R13-resistance R19, electric capacity C11-15 and operational amplifier U3, described resistance R13 is series between described rectification circuit and pfc circuit, the resistance R14 of one end by series connection of described resistance R13 and the positive input terminal of resistance R16 concatenation operation amplifier U3, the resistance R15 of the other end by series connection of resistance R13 and the negative input end of resistance R17 concatenation operation amplifier U3, the common port of described resistance R14 and resistance R16 is by electric capacity C12 ground connection, the common port of described resistance R15 and resistance R17 is by electric capacity C11 ground connection, the positive input terminal of described operational amplifier U3 meets power supply Vref by resistance R18 in parallel and electric capacity C15, the resistance R19 of the negative input end passage parallel connection of described operational amplifier U3 and the output of electric capacity C13 concatenation operation amplifier U3, the output of described operational amplifier U3 is by electric capacity C14 ground connection.
Described PFC input voltage sample circuit 4 comprises resistance R1-R6, electric capacity C1-C5 and operational amplifier U1, the resistance R2 of an output by series connection of described AC power and the positive input terminal of resistance R3 concatenation operation amplifier U1, the resistance R1 of another output by series connection and the negative input end of resistance R4 concatenation operation amplifier U1, the common port of described resistance R1 and R4 is by electric capacity C1 ground connection; The common port of described resistance R2 and R3 is by electric capacity C2 ground connection, the positive input terminal of described operational amplifier U1 meets power supply Vref by resistance R5 in parallel and electric capacity C5, the negative input end of described operational amplifier U2 connects the output of operational amplifier U1 by parallel resistance R6 electric capacity C3, the output of described operational amplifier U1 is by electric capacity C4 ground connection;
Described PFC output voltage sampling circuit 5 comprises resistance R20-R21 and electric capacity C16, described resistance R20 and resistance R21 is connected between two outputs of described PFC main power circuit, and the common port of described resistance R20 and resistance R21 passes through resistance R22 and the electric capacity C16 ground connection of series connection.
As shown in Figure 6, described normal PFC operation control module comprises: voltage error calculator, for by the instruction of PFC output voltage
with actual output voltage U
dccarry out asking difference operation, difference signal is sent to voltage regulator; Voltage regulator, for producing inductive current instruction amplitude according to difference signal
and send to synthesizer; Synthesizer, for according to input voltage phase and PFC inductive current instruction amplitude
combination inductance current instruction value
wherein input voltage phase is by the input voltage U of PFC main power circuit
acdivided by its amplitude U
acMcalculate; First current error calculator, for by inductive current command value
with actual inductive current value i
lcarry out asking difference operation, difference signal is sent to current regulator; First current regulator, for producing modulation signal according to difference signal, and sends to impulser; First pulse generator, for producing the pwm signal of driving switch pipe S according to described modulation signal, makes PFC inductive current follow inductive current command value
the real-time inductance value of PFC is calculated by the real-time voltage at PDC inductance two ends and the real-time current that flows through PFC inductance, judge whether it is in saturation condition according to PFC inductance value, if be in unsaturated state, produce the pwm signal of driving switch pipe S according to the actual current of pfc circuit input voltage, output voltage and inductance, pfc circuit is normally controlled.
The saturated inhibitory control module of described PFC inductance comprises: inductive current command value calculator, for current PFC inductor current value i
l90% as inductive current command value
second current error calculator, for by inductive current command value
with actual inductive current value i
lcarry out asking difference operation, difference signal is sent to current regulator; Second current regulator, for producing modulation signal according to difference signal, and sends to impulser; Second pulse generator, for producing the pwm signal of driving switch pipe S according to described modulation signal, makes PFC inductive current follow inductive current command value
the real-time inductance value of PFC is calculated by the real-time voltage at PDC inductance two ends and the real-time current that flows through PFC inductance, judge whether it is in saturation condition according to PFC inductance value, if the saturation condition of being in, produce the pwm signal of driving switch pipe S according to the actual current of PFC inductance, make PFC inductance exit saturation condition.Scheme is simple, real-time.
A kind of power-supply device, is characterized in that, comprise the saturated suppression circuit of PFC inductance described in technique scheme.
As shown in Figure 7, the saturated suppressing method of a kind of PFC inductance, comprises the steps:
S1, detects the magnitude of voltage U at PFC inductance two ends in PFC main power circuit in real time
lwith the current value i flowing through PFC inductance
l;
S2, according to magnitude of voltage U
lwith current value i
lreal-time calculating PFC inductance value L;
S3, compares according to the PFC inductance value L calculated and PFC inductance threshold value, when PFC inductance value L is more than or equal to PFC inductance threshold value, carries out normal PFC and runs control; Otherwise carry out the saturated inhibitory control of inductance, the saturated inhibitory control of described inductance refers to produce according to PFC inductive current the pwm signal driving PFC main power circuit switching tube S, make the electric current flowing through PFC inductance lower than current threshold, described current threshold instigates the undersaturated critical value of PFC inductance.
Step S1 also comprises the input voltage value U detecting PFC main power circuit in real time
acwith output voltage U
dc;
Step S3 is implemented as:
S3.1: the PFC inductance value L calculated in real time and PFC inductance threshold value are compared, when PFC inductance value L is more than or equal to PFC inductance threshold value, performs S3.2, when PFC inductance value L is less than PFC inductance threshold value, performs S3.3;
S3.2, according to the input voltage U of PFC main power circuit
ac, output voltage U
dcwith PFC inductive current i
ldescribed PFC main power circuit is controlled;
S3.3 is according to PFC inductive current i
ldescribed PFC main power circuit is controlled.
Described PFC inductance threshold value is 80% of PFC inductance rated value.
Step S3.2 is implemented as:
S3.2.1, by the instruction of PFC output voltage
with actual output voltage U
dccarry out asking difference operation;
S3.2.2, produces inductive current instruction amplitude according to difference signal
S3.2.3, according to input voltage phase and PFC inductive current instruction amplitude
combination inductance current instruction value
wherein input voltage phase is by the input voltage U of PFC main power circuit
acdivided by its amplitude U
acMcalculate;
S3.2.4, by inductive current command value
with actual inductive current value i
lcarry out asking difference operation;
S3.2.5, produces modulation signal according to difference signal;
S3.2.6, produces the pwm signal of driving switch pipe S, makes PFC inductive current follow inductive current command value according to described modulation signal
Step S3.3 is implemented as:
S3.3.1, with current PFC inductor current value i
l90% as inductive current command value
S3.3.2, by inductive current command value
with actual inductive current value i
lcarry out asking difference operation;
S3.3.3, produces modulation signal according to difference signal;
S3.3.4, produces the pwm signal of driving switch pipe S, makes PFC inductive current follow inductive current command value according to described modulation signal
The present invention adopts PFC inductive drop current signal to calculate PFC inductance value in real time, compare according to PFC calculating inductance value and inductance ratings value and then judge the operating state of PFC inductance, if PFC inductance works in unsaturated state, carrying out normal PFC and run control; If PFC inductance works in saturation condition, carry out the saturated inhibitory control of inductance, until PFC inductance exit saturation condition then system enter normal PFC and run and control thus realize the saturated suppression of real-time online of PFC inductance, suppress compared with PFC inductance saturation technique with existing, scheme cost of the present invention will greatly reduce, and be easy to realize.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the saturated suppression circuit of PFC inductance, is characterized in that, comprises PFC main power circuit (1), PFC inductive drop sample circuit (2), PFC inductive current sample circuit (3) and main control module (4); The input of described PFC main power circuit (1) is connected with AC power (5), and its output connects load (6);
Described PFC inductive drop sample circuit (2) and described PFC inductive current sample circuit (3) are for detecting the magnitude of voltage U at PFC inductance two ends in PFC main power circuit (1) respectively in real time
lwith the current value i flowing through PFC inductance
l, and send to main control module (4);
Described main control module (4) is for according to magnitude of voltage U
lwith current value i
lreal-time calculating PFC inductance value L, and compare according to the PFC inductance value L calculated and PFC inductance threshold value, when PFC inductance value L is more than or equal to PFC inductance threshold value, carries out normal PFC and run control; Otherwise carry out the saturated inhibitory control of inductance, the saturated inhibitory control of described inductance refers to produce according to PFC inductive current the pwm signal driving PFC main power circuit (1) switching tube S, make the electric current flowing through PFC inductance lower than current threshold, described current threshold instigates the undersaturated critical value of PFC inductance.
2. the saturated suppression circuit of a kind of PFC inductance according to claim 1, it is characterized in that, also comprise PFC input voltage sample circuit (7) and PFC output voltage sampling circuit (8), described PFC input voltage sample circuit (7) and described PFC output voltage sampling circuit (8) are for detecting the input voltage value U of PFC main power circuit respectively in real time
acwith output voltage U
dc, and send to main control module;
Described main control module (4) comprises normal PFC operation control module and the saturated inhibitory control module of PFC inductance;
Described normal PFC operation control module, for the input voltage U according to PFC main power circuit
ac, output voltage U
dcwith PFC inductive current i
lnormal PFC is carried out to described PFC main power circuit and runs control;
The saturated inhibitory control module of described PFC inductance, for according to PFC inductive current i
lthe saturated inhibitory control of inductance is carried out to described PFC main power circuit.
3. the saturated suppression circuit of a kind of PFC inductance according to claim 1 or 2, is characterized in that; Described PFC inductance threshold value is 80% of PFC inductance rated value.
4. the saturated suppression circuit of a kind of PFC inductance according to claim 2, is characterized in that,
Described normal PFC operation control module comprises:
Voltage error calculator, for by the instruction of PFC output voltage
with actual output voltage U
dccarry out asking difference operation, difference signal is sent to voltage regulator;
Voltage regulator, for producing inductive current instruction amplitude according to difference signal
and send to synthesizer;
Synthesizer, for according to input voltage phase and PFC inductive current instruction amplitude
combination inductance current instruction value
wherein input voltage phase is by the input voltage U of PFC main power circuit
acdivided by its amplitude U
acMcalculate;
First current error calculator, for by inductive current command value
with actual inductive current value i
lcarry out asking difference operation, difference signal is sent to current regulator;
First current regulator, for producing modulation signal according to difference signal, and sends to impulser;
First pulse generator, for producing the pwm signal of driving switch pipe S according to described modulation signal, makes PFC inductive current follow inductive current command value
The saturated inhibitory control module of described PFC inductance comprises:
Inductive current command value calculator, for current PFC inductor current value i
l90% as inductive current command value
Second current error calculator, for by inductive current command value
with actual inductive current value i
lcarry out asking difference operation, difference signal is sent to current regulator;
Second current regulator, for producing modulation signal according to difference signal, and sends to impulser;
Second pulse generator, for producing the pwm signal of driving switch pipe S according to described modulation signal, makes PFC inductive current follow inductive current command value
5. the saturated suppression circuit of a kind of PFC inductance according to claim 1, it is characterized in that, described PFC inductive drop sample circuit (2) adopts differential voltage sample circuit, comprise resistance R7-R12, electric capacity C6-C10 and op-amp U2, the resistance R7 of one end by series connection of described PFC inductance and the positive input terminal of resistance R9 concatenation operation amplifier U2, the other end of PFC inductance to be connected described operational amplifier U2 by the resistance R8 of series connection negative input end with resistance R10 connects, and the common port of described resistance R7 and R9 is by electric capacity C7 ground connection; The common port of described resistance R8 and R10 is by electric capacity C6 ground connection, the positive input terminal of described operational amplifier U2 meets power supply Vref by resistance R12 in parallel and electric capacity C8, the negative input end of described operational amplifier U2 connects the output of operational amplifier U2 by parallel resistance R11 electric capacity C9, the output of described operational amplifier U2 is by electric capacity C10 ground connection;
Described PFC inductive current sample circuit (3) comprises resistance R13-resistance R19, electric capacity C11-15 and operational amplifier U3, described resistance R13 is series between described rectification circuit and pfc circuit, the resistance R14 of one end by series connection of described resistance R13 and the positive input terminal of resistance R16 concatenation operation amplifier U3, the resistance R15 of the other end by series connection of resistance R13 and the negative input end of resistance R17 concatenation operation amplifier U3, the common port of described resistance R14 and resistance R16 is by electric capacity C12 ground connection, the common port of described resistance R15 and resistance R17 is by electric capacity C11 ground connection, the positive input terminal of described operational amplifier U3 meets power supply Vref by resistance R18 in parallel and electric capacity C15, the resistance R19 of the negative input end passage parallel connection of described operational amplifier U3 and the output of electric capacity C13 concatenation operation amplifier U3, the output of described operational amplifier U3 is by electric capacity C14 ground connection.
6. a power-supply device, is characterized in that, comprises the saturated suppression circuit of PFC inductance described in any one of claim 1-5.
7. the saturated suppressing method of PFC inductance, is characterized in that, comprise the steps:
S1, detects the magnitude of voltage U at PFC inductance two ends in PFC main power circuit in real time
lwith the current value i flowing through PFC inductance
l;
S2, according to magnitude of voltage U
lwith current value i
lreal-time calculating PFC inductance value L;
S3, compares according to the PFC inductance value L calculated and PFC inductance threshold value, when PFC inductance value L is more than or equal to PFC inductance threshold value, carries out normal PFC and runs control; Otherwise carry out the saturated inhibitory control of inductance, the saturated inhibitory control of described inductance refers to produce according to PFC inductive current the pwm signal driving PFC main power circuit switching tube S, make the electric current flowing through PFC inductance lower than current threshold, described current threshold instigates the undersaturated critical value of PFC inductance.
8. the saturated suppressing method of a kind of PFC inductance according to claim 7, is characterized in that,
Step S1 also comprises the input voltage value U detecting PFC main power circuit in real time
acwith output voltage U
dc;
Step S3 is implemented as:
S3.1: the PFC inductance value L calculated in real time and PFC inductance threshold value are compared, when PFC inductance value L is more than or equal to PFC inductance threshold value, performs S3.2, when PFC inductance value L is less than PFC inductance threshold value, performs S3.3;
S3.2, according to the input voltage U of PFC main power circuit
ac, output voltage U
dcwith PFC inductive current i
ldescribed PFC main power circuit is controlled;
S3.3 is according to PFC inductive current i
ldescribed PFC main power circuit is controlled.
9. the saturated suppressing method of a kind of PFC inductance according to claim 7 or 8, described PFC inductance threshold value is 80% of PFC inductance rated value.
10. the saturated suppressing method of a kind of PFC inductance according to claim 8, is characterized in that,
Step S3.2 is implemented as:
S3.2.1, by the instruction of PFC output voltage
with actual output voltage U
dccarry out asking difference operation;
S3.2.2, produces inductive current instruction amplitude according to difference signal
S3.2.3, according to input voltage phase and PFC inductive current instruction amplitude
combination inductance current instruction value
wherein input voltage phase is by the input voltage U of PFC main power circuit
acdivided by its amplitude U
acMcalculate;
S3.2.4, by inductive current command value
with actual inductive current value i
lcarry out asking difference operation;
S3.2.5, produces modulation signal according to difference signal;
S3.2.6, produces the pwm signal of driving switch pipe S, makes PFC inductive current follow inductive current command value according to described modulation signal
Step S3.3 is implemented as:
S3.3.1, with current PFC inductor current value i
l90% as inductive current command value
S3.3.2, by inductive current command value
with actual inductive current value i
lcarry out asking difference operation;
S3.3.3, produces modulation signal according to difference signal;
S3.3.4, produces the pwm signal of driving switch pipe S, makes PFC inductive current follow inductive current command value according to described modulation signal
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