CN104362844B - The control method and device of PFC - Google Patents
The control method and device of PFC Download PDFInfo
- Publication number
- CN104362844B CN104362844B CN201410715153.4A CN201410715153A CN104362844B CN 104362844 B CN104362844 B CN 104362844B CN 201410715153 A CN201410715153 A CN 201410715153A CN 104362844 B CN104362844 B CN 104362844B
- Authority
- CN
- China
- Prior art keywords
- input
- output voltage
- data
- current
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
-
- 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
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
-
- 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
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Rectifiers (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of control method and device of PFC, this method includes：Obtain input rectifying voltage data, input inductive current data and the output voltage data of pfc circuit；Compare output voltage data and default output voltage reference value, it is poor to obtain output voltage；Calculate the error amount of output voltage difference；According to the error amount of output voltage difference, input rectifying voltage data and input inductive current data, calculate and obtain input current reference value；According to input inductive current data and input current reference value, the dutycycle for obtaining switching signal is calculated, the dutycycle is used for the switch motion for controlling the pfc circuit.Using the embodiment of the present invention, on the premise of same PFC is met, the unnecessary loss of PFC switching tubes and EMC interference are reduced.
Description
Technical field
The present invention relates to electronic circuit technology field, more particularly to a kind of control method and device of PFC.
Background technology
PFC (Power Factor Correction, abbreviation PFC) refers to effective power and total power consumption
Relation between (apparent energy), that is, the ratio of effective power divided by total power consumption (apparent energy).Substantially power because
Element can weigh the degree that electric power is used effectively, and when power factor (PF) value is bigger, it is higher to represent its electric power utilization rate.Current
PFC technologies include：Passive PFC technologies and active PFC technologies.
But PFC corrections are carried out using active PFC technologies, switching tube has switch motion in whole half wave cycles.Tool
Body can be found in Fig. 1, and Fig. 1 is the oscillogram of PFC control electric currents, as shown in figure 1, especially near the crest of half-wave, the peak of electric current
Value and virtual value are all bigger, and now the switching loss of switching tube and peak point current rate of change (di/dt) are all very high.Now,
If switching tube has work, unnecessary loss and serious electromagnetic compatibility problem (Electro Magnetic will result in
Compatibility, abbreviation EMC).
The content of the invention
The embodiment of the present invention proposes a kind of control method and device of PFC, is meeting same power factor school
On the premise of just, the unnecessary loss of PFC switching tubes and EMC interference are reduced.
The embodiments of the invention provide a kind of control method of PFC, including：
The value of the output voltage of pfc circuit is set, and the value of the output voltage is less than the peak value of input rectifying voltage；
Obtain input rectifying voltage data, input inductive current data and the output voltage data of the pfc circuit；Its
In, the input rectifying voltage data includes waveform or the phase angle of input rectifying voltage, the input inductive current packet
Include waveform or the phase angle of the input inductive current；
Compare the output voltage data and default output voltage reference value, it is poor to obtain output voltage；
Calculate the error amount of the output voltage difference；
According to the error amount of output voltage difference, the input rectifying voltage data and the input inductive current number
According to calculating obtains input current reference value；
According to the input inductive current data and input current reference value, the dutycycle for obtaining switching signal, institute are calculated
The switch motion that dutycycle is used to control the pfc circuit is stated, so that the input current of the pfc circuit is automatically same at crest
Walk the phase of the input rectifying voltage.
Further, the input rectifying voltage data for obtaining pfc circuit, input inductive current data and output voltage
Data, it is specially：
Input rectifying voltage signal, input inductor current signal and the output voltage signal of pfc circuit are detected, and to described
The signal of detection carries out digital-to-analogue conversion processing, obtains the input rectifying voltage data, input inductive current data and output electricity
Press data.
Further, according to the error amount of output voltage difference, the input rectifying voltage data and the input electricity
Electrification flow data, calculate and obtain reference input electric current, be specially：
According to the input rectifying voltage data, the average value of the input rectifying voltage is calculated；
By the average value one of the error amount of output voltage difference, input rectifying voltage data and the input rectifying voltage
One is multiplied, and by the value obtained after multiplication with reference to the input inductive current data, calculates and obtains input current reference value.
Further, the average value of the input rectifying voltage is calculated using below equation：
C=1/ (Vdc*Vdc)；
Wherein, C is the average value of the input rectifying voltage, and Vdc is the input rectifying voltage.
Further, it is described according to the input inductive current data and input current reference value, calculate and obtain switch letter
Number dutycycle, be specially：
Compare the input inductive current data and input current reference value, it is poor to obtain input current；
Calculate the error amount of the input current difference；
According to the error amount of input current difference, the dutycycle for obtaining switching signal is calculated.
Further, the error amount for calculating the output voltage difference and the mistake for calculating the input current difference
Difference, it is specially：
Poor according to the output voltage, adoption rate integral and calculating obtains the error amount of the output voltage difference；
With, the error amount of the adoption rate integral and calculating acquisition input current difference poor according to the input current.
On the other hand, the embodiments of the invention provide a kind of control device of PFC, including：
Setup module, the value of the output voltage for setting pfc circuit, the value of the output voltage is less than input rectifying electricity
The peak value of pressure；
Acquisition module, for obtaining input rectifying voltage data, input inductive current data and the output of the pfc circuit
Voltage data, wherein, the input rectifying voltage data includes waveform and the phase angle of input rectifying voltage, the input inductance
Current data includes waveform and the phase angle of the input inductive current；
Comparison module, for the output voltage data and default output voltage reference value, obtain output voltage
Difference；
First computing module, for calculating the error amount of the output voltage difference；
Second computing module, for error amount, the input rectifying voltage data and the institute according to output voltage difference
Input inductive current data are stated, calculates and obtains input current reference value；
3rd computing module, for being opened according to the input inductive current data and input current reference value, calculating
The dutycycle of OFF signal, the dutycycle is used for the switch motion for controlling the pfc circuit, so that the input of the pfc circuit
The phase of electric current input rectifying voltage described in automatic synchronization at crest.
Further, the acquisition module includes：
Detecting signal unit, for detecting input rectifying voltage signal, input inductor current signal and the output of pfc circuit
Voltage signal；
D/A conversion unit, for carrying out digital-to-analogue conversion processing to the signal of the detection, obtain the input rectifying electricity
Press data, input inductive current data and output voltage data.
Further, second computing module includes：
First computing unit, for according to the input rectifying voltage data, calculating being averaged for the input rectifying voltage
Value；
Second computing unit, for by the output voltage difference error amount, input rectifying voltage data and the input
The average value of commutating voltage is multiplied one by one, and by the value obtained after multiplication with reference to the input inductive current data, it is defeated to calculate acquisition
Enter current reference value.
Further, the 3rd computing module includes：
Electric current comparing unit, for the input inductive current data and input current reference value, obtain input electricity
Stream is poor；
3rd computing unit, for calculating the error amount of the input current difference；
4th computing unit, for the error amount according to input current difference, calculate the dutycycle for obtaining switching signal.
It can be seen that implementing the embodiment of the present invention, have the advantages that：
A kind of control method of PFC provided in an embodiment of the present invention, obtain input rectifying voltage data, defeated
Enter inductive current data and output voltage data, the output voltage data of acquisition and default output voltage reference value are compared
Compared with acquisition output voltage is poor, and calculates the error amount of output voltage difference.According to the error amount of output voltage difference and input rectifying electricity
The waveform of pressure and phase angle, the waveform of input inductive current and phase angle, calculate and obtain input current reference value.Further according to input
Inductive current data and input current reference value, calculate the dutycycle for obtaining switching signal.PFC switching tubes enter according to the dutycycle
Row switch motion, switch motion is carried out near peak point current so as to avoid PFC switching tubes.Closed loop is used compared to prior art
The method of control, technical solution of the present invention carries out data processing to the waveform and phase angle that input inductive current, then passes through control
Output voltage makes electric current automatic synchronization input voltage phase at crest, so that PFC switching tubes are without in current peak
Carry out switch motion.On the premise of identical PFC is met, technical solution of the present invention is avoided that PFC switching tubes exist
The loss of peak point current annex and because peak point current rate of change is excessive and caused by EMC disturb, so as to reduce the temperature of PFC switching tubes
Rise the cost with filter circuit.
Further, the peak value of the invention according to input rectifying voltage, the value of output voltage is set, by the value of output voltage
Slightly less than input rectifying voltage peak is arranged to, increases the automatic tracing scope of input current, is further reduced in voltage crest
Reduce the loss of PFC switching tubes and reduce EMC interference.
Brief description of the drawings
Fig. 1 is the oscillogram of the PFC control electric currents of prior art；
Fig. 2 is a kind of schematic flow sheet of embodiment of PFC provided by the invention；
Fig. 3 is a kind of circuit structure schematic diagram of embodiment of PFC provided by the invention；
Fig. 4 is a kind of oscillogram of embodiment of PFC control electric currents provided by the invention；
Fig. 5 is a kind of structural representation of embodiment of power factor correcting provided by the invention；
Fig. 6 is a kind of structural representation of embodiment of acquiring unit provided by the invention；
Fig. 7 is a kind of structural representation of embodiment of the second computing module provided by the invention；
Fig. 8 is a kind of structural representation of embodiment of the 3rd computing module provided by the invention.
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 describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
Embodiment 1
Referring to Fig. 2, Fig. 2 is a kind of schematic flow sheet of embodiment of PFC provided by the invention.The present invention
Technical scheme is applied to pfc circuit, and this method comprises the following steps：
Step 101：Obtain input rectifying voltage data, input inductive current data and the output voltage data of pfc circuit.
In the present embodiment, input rectifying voltage data includes waveform or the phase angle of input rectifying voltage, inputs inductance
Current data includes waveform or the phase angle of input inductive current.The phase angle of input rectifying voltage can be obtained according to its waveform
.
In the present embodiment, when obtaining pfc circuit data, the waveform of voltage x current is not exclusively obtained, can also be obtained
The phase angle of voltage x current data, by carrying out data processing to phase angle or waveform, so as to reach the technique effect of the present invention.
In the present embodiment, by detect in real time pfc circuit input rectifying voltage signal, input inductor current signal and
Output voltage signal, digital-to-analogue conversion processing is carried out to the signal of detection by D/A converter module, changes voltage and current signal
For data signal, input rectifying voltage data, input inductive current data and output voltage data are obtained, and be input to digital letter
Number process chip.
Step 102：Compare output voltage data and default output voltage reference value, it is poor to obtain output voltage.
In the present embodiment, output voltage reference value is manually set, and output voltage reference value is subtracted into output voltage
Value, it is poor to obtain output voltage.
Step 103：Calculate the error amount of output voltage difference.
In the present embodiment, poor according to output voltage, adoption rate integral and calculating obtains the error amount of output voltage difference.Should
Link is by the way that output voltage difference to be passed to the pi regulator of outer voltage, so as to calculate the error for obtaining output voltage difference
Value.
Step 104：According to the error amount of output voltage difference, input rectifying voltage data and the input inductive current number
According to calculating obtains input current reference value.
In the present embodiment, after the error amount that pi regulator obtains output voltage difference, according to the input rectifying of acquisition electricity
Pressure, the reference value for obtaining input current is calculated, be specially：First according to input rectifying voltage data, input rectifying voltage is calculated
Average value, then by the error amount of output voltage difference, the value of input rectifying voltage, input rectifying voltage average value three one by one
It is multiplied, the value obtained after multiplication is combined to waveform and phase angle in input inductive current data, calculates and obtains input current ginseng
Examine value.
Step 105：According to input inductive current data and input current reference value, the duty for obtaining switching signal is calculated
Than the dutycycle is used for the switch motion for controlling pfc circuit.
In the present embodiment, will input inductance electricity in order to realize input current in peak value annex automatic tracing input voltage
Stream subtracts input current reference value the value of input inductive current compared with input current reference value, obtains input current
Difference.Passing ratio integral and calculating obtains the error amount of input current difference again, and according to the error amount of input current difference, calculating is opened
The dutycycle of OFF signal.The dutycycle of switching signal this technology is obtained to be existing due to the error amount according to input current difference
Technology, in this not go into detail.
In the present embodiment, the error amount of adoption rate integral and calculating input current difference, it is specially：Input current difference is passed
The pi regulator of current inner loop is passed, so as to calculate the error amount for obtaining input current difference.
In order to preferably describe the operation principle of technical solution of the present invention and step, referring to Fig. 3, Fig. 3 provides for the present invention
A kind of embodiment circuit structure schematic diagram.Wherein, the schematic diagram is divided into three parts, and first is pfc circuit part, digital-to-analogue turn
Change part and analog portion.As shown in figure 3, input power Vac, rectifier bridge BD1, inductance L1, resistance R2, switching tube Q1, two poles
Pipe D1, electric capacity EC1 and load RL composition pfc circuits part, each annexation of the pfc circuit part is prior art, herein
Repeat no more.
Digital-to-analogue conversion part mainly includes a/d converter and DA converters, detects the input rectifying voltage of pfc circuit respectively
Signal, input inductor current signal and output voltage signal, and the voltage and current signal of detection is carried out by a/d converter
Digital-to-analogue conversion, input rectifying voltage Vdc, input inductive current Iin and output voltage Vo after being handled respectively, the number of acquisition
According to including waveform and phase angle.And corresponding signal is exported to PFC by DA converters in the dutycycle of the invention finally obtained
The control terminal of switching tube, so as to control the switch motion of PFC switching tubes.
Analog portion is specifically calculated by digital signal processing chip DSP, three ends of digital signal processing chip DSP
Mouth receives input rectifying voltage Vdc, input inductive current Iin and output voltage Vo respectively.First, by output voltage Vo and output
Voltage reference value Vref is compared, and it is poor (Vref-Vo) to obtain output voltage.Output voltage poor (Vref-Vo) is sent into electricity again
The pi regulator of outer shroud is pressed, pi regulator is calculated the error amount for obtaining output voltage poor (Vref-Vo) by function Gvea, that is, schemed
B in 2.Then error amount B, C are multiplied one by one with A, wherein, C is input rectifying voltage Vdc average value, and A is input rectifying
Voltage Vdc.Need first to calculate C value before multiplication, according to formula C=1/ (Vdc*Vdc), calculate the value for obtaining C.Three is multiplied
Afterwards, the waveform further according to input inductive current and phase angle, calculate and obtain input current reference value Iref.For example user can be set
When in the range of 120 degree of phase angle to 180 degree, input current reference value is 0 etc., and input current is adjusted by setting phase angle
The scope of automatic tracing, so as to the work period of adjusting switch pipe.Then input current reference value Iref and input inductance are compared
Electric current Iin, acquisition input current is poor (Iref-Iin), and the PI that input current poor (Iref-Iin) is sent into current inner loop is adjusted
Device, the error amount for obtaining input current poor (Iref-Iin) is calculated by function Gea, further according to the poor error amount of input current,
Calculate the dutycycle for obtaining switching signal.Dutycycle is changed through DA and exported, by being passed after PWM peripheral circuits and gate drive circuit
PFC switching tubes are passed, PFC switching tubes are according to the Duty ratio control switch motion.PFC switching tubes are according to the switch of Duty ratio control
Action, avoids the switch motion near peak point current, so as to avoid the loss of switching tube and too high by peak change rate and make
Into EMC interference.
In the present embodiment, when being calculated using input rectifying voltage data Vdc with input inductive current data Iin,
It can be, but not limited to the waveform using input rectifying voltage or phase angle, and the waveform of input inductive current data or phase angle
Calculated.
As one kind citing of the present embodiment, also include before step 101：The value of output voltage, output electricity are set
The value of pressure is less than the peak value of input rectifying voltage.In embodiments of the present invention, ratio output voltage reference value set inputs peak
Threshold voltage is lower, then electric current meeting automatic tracing voltage waveform when input voltage is more than output bulky capacitor voltage, in output voltage
During closer to the peak value of input rectifying voltage, the scope of electric current automatic tracing voltage is bigger.Before PFC is met
Put, avoid loss and EMC problem of the PFC switching tubes near peak point current.Detailed can be found in Fig. 4, and Fig. 4 is the present invention
The PFC current control waveforms obtained based on the technical program that embodiment provides.
A kind of control method of PFC provided in an embodiment of the present invention, obtain input rectifying voltage data, defeated
Enter inductive current data and output voltage data, the output voltage data of acquisition and default output voltage reference value are compared
Compared with acquisition output voltage is poor, and calculates the error amount of output voltage difference.According to the error amount of output voltage difference and input rectifying electricity
The waveform of pressure and phase angle, the waveform of input inductive current and phase angle, calculate and obtain input current reference value.Further according to input
Inductive current data and input current reference value, calculate the dutycycle for obtaining switching signal.PFC switching tubes enter according to the dutycycle
Row switch motion, switch motion is carried out near peak point current so as to avoid PFC switching tubes.Closed loop is used compared to prior art
The method of control, technical solution of the present invention carries out data processing to the waveform and phase angle that input inductive current, then passes through control
Output voltage makes electric current automatic synchronization input voltage phase at crest, so that PFC switching tubes are without in current peak
Carry out switch motion.On the premise of identical PFC is met, technical solution of the present invention is avoided that PFC switching tubes exist
The loss of peak point current annex and because peak point current rate of change is excessive and caused by EMC disturb, so as to reduce the temperature of PFC switching tubes
Rise the cost with filter circuit.
Further, the peak value of the invention according to input rectifying voltage, the value of output voltage is set, by the value of output voltage
Slightly less than input rectifying voltage peak is arranged to, increases the automatic tracing scope of input current, is further reduced in voltage crest
Reduce the loss of PFC switching tubes and reduce EMC interference.
Embodiment 2
Referring to Fig. 5, Fig. 5 is the embodiments of the invention provide a kind of structural representation of embodiment of power factor correcting
Figure, the device are applied to the PFC of pfc circuit, mainly included：
Acquisition module 501, for obtaining input rectifying voltage data, input inductive current data and the output of pfc circuit
Voltage data, wherein, input rectifying voltage data includes waveform or the phase angle of input rectifying voltage, inputs inductive current data
Waveform or phase angle including inputting inductive current；
Comparison module 502, electrically connected with acquisition module 501, for comparing output voltage data and default output voltage
Reference value, it is poor to obtain output voltage；
First computing module 503, is electrically connected with comparison module 502, for calculating the error amount of output voltage difference；
Second computing module 504, it is electrically connected with acquisition module 501, the first computing module 503, for according to output
Error amount, input rectifying voltage data and the input inductive current data of voltage difference, calculate and obtain input current reference value；
3rd computing module 505, it is electrically connected with acquisition module 501, the second computing module 504, for according to input
Inductive current data and input current reference value, calculate the dutycycle for obtaining switching signal, and the dutycycle is described for controlling
The switch motion of pfc circuit.
Referring to Fig. 6, Fig. 6 is a kind of structural representation of embodiment of acquiring unit 501 provided by the invention.Acquiring unit
501 include：Detecting signal unit 601 and the D/A conversion unit 602 being connected electrically.Detecting signal unit 601 is used to detect
The input rectifying voltage signal of pfc circuit, input inductor current signal and output voltage signal, D/A conversion unit 602 are used for
Digital-to-analogue conversion processing is carried out to the signal of the detection, obtains input rectifying voltage data, input inductive current data and output electricity
Press data.
Referring to Fig. 7, Fig. 7 is a kind of structural representation of embodiment of the second computing module 503 provided by the invention.Second
Computing module 503 includes：First computing unit 701 and the second computing unit 702 being connected electrically.First computing unit 701
For according to input rectifying voltage data, the average value of calculating input rectifying voltage.Second computing unit 702, for that will export
Error amount, the input rectifying voltage data of voltage difference are multiplied one by one with the average value of input rectifying voltage, by what is obtained after multiplication
Value combines input inductive current data, calculates and obtains input current reference value.
Referring to Fig. 8, Fig. 8 is a kind of structural representation of embodiment of the 3rd computing module 504 provided by the invention.3rd
Computing module 504 includes：Electric current comparing unit 801, for comparing input inductive current data and input current reference value, obtain
Input current is poor.3rd computing unit 802, electrically connected with electric current comparing unit 801, for calculating the error of input current difference
Value.4th computing unit 803, electrically connected with the 3rd computing unit 802, for the error amount according to input current difference, calculating obtains
Obtain the dutycycle of switching signal.
Referring to Fig. 9, Fig. 9 is the structural representation of another embodiment of control device provided in an embodiment of the present invention.Fig. 9
Difference with Fig. 5 is that Fig. 9 control device also includes：Setup module 901, electrically connected with acquisition module 501, for setting
The value of output voltage, the value of the output voltage are less than the peak value of input rectifying voltage.In embodiments of the present invention, by output voltage
The ratio input crest voltage of setting is lower, then electric current can automatic tracing voltage wave when input voltage is more than output bulky capacitor voltage
Shape, its tracking range are relevant by the arranges value of output voltage.On the premise of PFC is met, PFC switches are avoided
Loss and EMC problem of the pipe near peak point current.
The more detailed step of the present embodiment can be, but not limited to the related record referring to embodiment 1 to operation principle.
Therefore the embodiments of the invention provide a kind of control device of PFC, filled using the present embodiment
Put to input inductive current waveform or phase angle carry out data processing, then by control output voltage make electric current at crest from
Synchronous input voltage phase is moved, so that PFC switching tubes are without carrying out switch motion in current peak.Meeting identical
On the premise of PFC, technical solution of the present invention is avoided that PFC switching tubes in the loss of peak point current annex and because of peak
Be worth current changing rate it is excessive and caused by EMC disturb, so as to reduce the cost of the temperature rise of PFC switching tubes and filter circuit.
Further, the peak value of the invention according to input rectifying voltage, the value of output voltage is set, by the value of output voltage
Slightly less than input rectifying voltage peak is arranged to, increases the automatic tracing scope of input current, is further reduced in voltage crest
Reduce the loss of PFC switching tubes and reduce EMC interference.
One of ordinary skill in the art will appreciate that realize all or part of flow in above-described embodiment method, being can be with
The hardware of correlation is instructed to complete by computer program, described program can be stored in a computer read/write memory medium
In, the program is upon execution, it may include such as the flow of the embodiment of above-mentioned each method.Wherein, described storage medium can be magnetic
Dish, CD, read-only memory (Read-Only Memory, ROM) or random access memory (Random Access
Memory, RAM) etc..
Described above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications are also considered as
Protection scope of the present invention.
Claims (10)
- A kind of 1. control method of PFC, it is characterised in that including：The value of the output voltage of pfc circuit is set, and the value of the output voltage is less than the peak value of input rectifying voltage；Obtain input rectifying voltage data, input inductive current data and the output voltage data of pfc circuit；Wherein, it is described defeated Entering commutating voltage data includes waveform or the phase angle of input rectifying voltage, and the input inductive current data include the input The waveform of inductive current or phase angle；Compare the output voltage data and default output voltage reference value, it is poor to obtain output voltage；Calculate the error amount of the output voltage difference；According to the error amount of output voltage difference, the input rectifying voltage data and the input inductive current data, meter Calculate and obtain input current reference value；According to the input inductive current data and input current reference value, the dutycycle for obtaining switching signal is calculated, it is described to account for The empty switch motion than for controlling the pfc circuit, so that the input current of pfc circuit automatic synchronization institute at crest State the phase of input rectifying voltage.
- 2. the control method of PFC according to claim 1, it is characterised in that the acquisition pfc circuit Input rectifying voltage data, input inductive current data and output voltage data, it is specially：Input rectifying voltage signal, input inductor current signal and the output voltage signal of pfc circuit are detected, and to the detection Signal carry out digital-to-analogue conversion processing, obtain the input rectifying voltage data, input inductive current data and output voltage number According to.
- 3. the control method of PFC according to claim 1, it is characterised in that poor according to the output voltage Error amount, the input rectifying voltage data with it is described input inductive current data, calculate obtain reference input electric current, specifically For：According to the input rectifying voltage data, the average value of the input rectifying voltage is calculated；By the average value phase one by one of the error amount of output voltage difference, input rectifying voltage data and the input rectifying voltage Multiply, by the value obtained after multiplication with reference to the input inductive current data, calculate and obtain input current reference value.
- 4. the control method of PFC according to claim 3, it is characterised in that the input rectifying voltage Average value is calculated using below equation：C=1/ (Vdc*Vdc)；Wherein, C is the average value of the input rectifying voltage, and Vdc is the input rectifying voltage.
- 5. the control method of PFC according to claim 1, it is characterised in that described according to the input electricity Electrification flow data and input current reference value, calculate the dutycycle for obtaining switching signal, are specially：Compare the input inductive current data and input current reference value, it is poor to obtain input current；Calculate the error amount of the input current difference；According to the error amount of input current difference, the dutycycle for obtaining switching signal is calculated.
- 6. the control method of PFC according to claim 5, it is characterised in that described to calculate the output electricity The error amount of pressure difference and the error amount for calculating the input current difference, it is specially：Poor according to the output voltage, adoption rate integral and calculating obtains the error amount of the output voltage difference；With, the error amount of the adoption rate integral and calculating acquisition input current difference poor according to the input current.
- A kind of 7. control device of PFC, it is characterised in that including：Setup module, the value of the output voltage for setting pfc circuit, the value of the output voltage is less than input rectifying voltage Peak value；Acquisition module, for obtaining input rectifying voltage data, input inductive current data and the output voltage of the pfc circuit Data, wherein, the input rectifying voltage data includes waveform and the phase angle of input rectifying voltage, the input inductive current Data include waveform and the phase angle of the input inductive current；Comparison module, for the output voltage data and default output voltage reference value, it is poor to obtain output voltage；First computing module, for calculating the error amount of the output voltage difference；Second computing module, for according to the output voltage difference error amount, the input rectifying voltage data with it is described defeated Enter inductive current data, calculate and obtain input current reference value；3rd computing module, for according to the input inductive current data and input current reference value, calculating and obtaining switch letter Number dutycycle, the dutycycle is used to control the switch motion of the pfc circuit, so that the input current of the pfc circuit The phase of input rectifying voltage described in automatic synchronization at crest.
- 8. the control device of the PFC according to claim requirement 7, it is characterised in that the acquisition module bag Include：Detecting signal unit, for detecting input rectifying voltage signal, input inductor current signal and the output voltage of pfc circuit Signal；D/A conversion unit, for carrying out digital-to-analogue conversion processing to the signal of the detection, obtain the input rectifying voltage number According to, input inductive current data and output voltage data.
- 9. the control device of PFC according to claim 7, it is characterised in that the second computing module bag Include：First computing unit, for according to the input rectifying voltage data, calculating the average value of the input rectifying voltage；Second computing unit, for by the output voltage difference error amount, input rectifying voltage data and the input rectifying The average value of voltage is multiplied one by one, by the value obtained after multiplication with reference to the input inductive current data, calculates and obtains input electricity Flow reference value.
- 10. the control device of PFC according to claim 7, it is characterised in that the 3rd computing module Including：Electric current comparing unit, for the input inductive current data and input current reference value, it is poor to obtain input current；3rd computing unit, for calculating the error amount of the input current difference；4th computing unit, for the error amount according to input current difference, calculate the dutycycle for obtaining switching signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410715153.4A CN104362844B (en) | 2014-11-28 | 2014-11-28 | The control method and device of PFC |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410715153.4A CN104362844B (en) | 2014-11-28 | 2014-11-28 | The control method and device of PFC |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104362844A CN104362844A (en) | 2015-02-18 |
| CN104362844B true CN104362844B (en) | 2018-01-23 |
Family
ID=52530080
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410715153.4A Active CN104362844B (en) | 2014-11-28 | 2014-11-28 | The control method and device of PFC |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104362844B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106452046B (en) * | 2016-10-13 | 2019-03-29 | 广州视源电子科技股份有限公司 | A kind of switch controlled method and device of pfc circuit |
| CN108322038B (en) * | 2018-02-08 | 2020-05-08 | 佛山市顺德区和而泰电子科技有限公司 | PFC circuit control method and loop-free PFC control circuit applying same |
| CN108736716B (en) * | 2018-06-22 | 2023-11-28 | 武汉理工大学 | Digital current-imitating controller of DC/DC converter and control method thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101582633A (en) * | 2008-05-14 | 2009-11-18 | 台达电子工业股份有限公司 | Three-phase boosting and deboosting power factor correction circuit and control method thereof |
| CN101714829A (en) * | 2008-10-01 | 2010-05-26 | 弗莱克斯电子有限责任公司 | Power factor correction circuit |
| CN202121362U (en) * | 2011-07-13 | 2012-01-18 | 山东电力研究院 | Charger based on active power factor correction technology |
| CN102332814A (en) * | 2011-09-14 | 2012-01-25 | 杭州矽力杰半导体技术有限公司 | Power factor correction control circuit for reducing EMI (electro magnetic interference) |
| CN203537228U (en) * | 2013-09-24 | 2014-04-09 | 厦门蓝溪科技有限公司 | Digital PFC (Power Factor Correction) control system for power supply product |
| CN103916004A (en) * | 2014-04-22 | 2014-07-09 | 成都芯源系统有限公司 | Power factor correction circuit and control method thereof |
| WO2014126922A1 (en) * | 2013-02-13 | 2014-08-21 | Power-One, Inc. | Power converter with non-symmetrical totem pole rectifier and current-shaping branch circuits |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203708101U (en) * | 2014-01-09 | 2014-07-09 | 常州隆辉照明科技有限公司 | Switch-free high-power factor compensation circuit |
-
2014
- 2014-11-28 CN CN201410715153.4A patent/CN104362844B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101582633A (en) * | 2008-05-14 | 2009-11-18 | 台达电子工业股份有限公司 | Three-phase boosting and deboosting power factor correction circuit and control method thereof |
| CN101714829A (en) * | 2008-10-01 | 2010-05-26 | 弗莱克斯电子有限责任公司 | Power factor correction circuit |
| CN202121362U (en) * | 2011-07-13 | 2012-01-18 | 山东电力研究院 | Charger based on active power factor correction technology |
| CN102332814A (en) * | 2011-09-14 | 2012-01-25 | 杭州矽力杰半导体技术有限公司 | Power factor correction control circuit for reducing EMI (electro magnetic interference) |
| WO2014126922A1 (en) * | 2013-02-13 | 2014-08-21 | Power-One, Inc. | Power converter with non-symmetrical totem pole rectifier and current-shaping branch circuits |
| CN203537228U (en) * | 2013-09-24 | 2014-04-09 | 厦门蓝溪科技有限公司 | Digital PFC (Power Factor Correction) control system for power supply product |
| CN103916004A (en) * | 2014-04-22 | 2014-07-09 | 成都芯源系统有限公司 | Power factor correction circuit and control method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104362844A (en) | 2015-02-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104917358B (en) | Occupancy controller | |
| CN106100373B (en) | The high frequency CRM boost PFC converters of adaptive optimization THD | |
| US10917006B1 (en) | Active burst ZVS boost PFC converter | |
| JP5326804B2 (en) | Power factor improving power supply device, control circuit used for power supply device, and control method | |
| CN102484425B (en) | Pfc converter | |
| TWI551018B (en) | Power factor correction conversion device and control method thereof | |
| CN100468931C (en) | Voltage boosting type device and method of consecutive correcting power factor in average electric current control mode | |
| US6249108B1 (en) | Unified constant-frequency integration control of active power filters | |
| CA2806870A1 (en) | Digital controller based detection methods for adaptive mixed conduction mode power factor correction circuit | |
| CN106230257A (en) | A kind of two-way DC converter feedback linearization contragradience sliding-mode control | |
| CN106253661A (en) | Control circuit, control method and apply its power inverter | |
| CN110661439B (en) | Device and method for reducing digital switching power supply ripple | |
| CA2751915A1 (en) | Methods and circuits for improving the dynamic response of a dc-dc converter | |
| CN104362844B (en) | The control method and device of PFC | |
| CN112152440A (en) | Discontinuous conduction mode and continuous conduction mode power factor corrector circuit | |
| CN100433513C (en) | Method for controlling power-factor correct circuit | |
| Sivanagaraju et al. | PFC interleaved buck-boost converter for telecom power application | |
| CN101014920A (en) | High frequency partial boost power factor correction control circuit and method | |
| Etz et al. | Comparison between digital average current mode control and digital one cycle control for a bridgeless PFC boost converter | |
| CN105932870B (en) | Method and control circuit for PFC current shaping | |
| CN202750006U (en) | Power-factor correction circuit | |
| Voytenko et al. | Simulation peculiarities of high-frequency zero-current switching quasi-resonant boost converter | |
| Liu et al. | A high-efficiency single-phase AC/DC converter with enabling window control and active input bridge | |
| Batarseh et al. | Power factor correction circuits | |
| CN104009631A (en) | Buck-type power factor converter for eliminating dead zone through pulse auxiliary method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |