CN106899202A - AC-DC converter and its power factor correction circuit - Google Patents
AC-DC converter and its power factor correction circuit Download PDFInfo
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- CN106899202A CN106899202A CN201510973805.9A CN201510973805A CN106899202A CN 106899202 A CN106899202 A CN 106899202A CN 201510973805 A CN201510973805 A CN 201510973805A CN 106899202 A CN106899202 A CN 106899202A
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Classifications
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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
-
- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Rectifiers (AREA)
Abstract
A kind of power factor correction circuit includes：Frequency generator, voltage-controlled oscillator (VCO), frenquency signal selector, replacement signal generating circuit, latch unit and comparator.Frenquency signal selector receives first frequency and second frequency, and exports first frequency with frequency the higher person in second frequency.Latch unit output pulse width modulation signal to the switch of AC-DC converter control end.Comparator compares the first sample signal and upper current limit signal, and when the size of the first sample signal reaches the critical current mode value corresponding to upper current limit signal, comparator controls voltage-controlled oscillator (VCO) that the frequency of the frequency of second frequency and triangular wave signal is risen above into the frequency of first frequency, and controls voltage-controlled oscillator (VCO) to reach the number of times of critical current mode value according to the first sample signal to be incremented by the frequency of second frequency and triangular wave signal.
Description
Technical field
The invention relates to a kind of technology of converter, in particular to one kind exchange-
Direct current transducer and its power factor correction circuit.
Background technology
AC-DC converter has been widely used in various electronic products, and technology is constantly smart
Enter.In order to improve the operating efficiency of AC-DC converter, typically all in AC-DC
Install power factor correction circuit (Power Factor Correction in converter additional；PFC) enter
The improvement of row power factor.
However, traditional AC-DC converter does not all suppress the size of its inductive current,
Therefore the excessive problem of the peak value of inductive current is had.
The content of the invention
The present invention proposes a kind of power factor correction circuit, and it can help AC-DC converter
Suppress the peak value of its inductive current.
The present invention separately proposes a kind of AC-DC conversion comprising above-mentioned power factor correction circuit
Device.
A kind of power factor correction circuit provided by the present invention, it is adaptable to which AC-DC is changed
Device, power factor correction circuit includes：Frequency generator, voltage-controlled oscillator (VCO), frenquency signal choosing
Select device, reset signal generating circuit, latch unit and comparator.Frequency generator is used to produce
Raw first frequency.Voltage-controlled oscillator (VCO) is used to produce second frequency and triangular wave signal.Frequency
Signal selector is used to receive first frequency and second frequency, and exports first frequency and
Frequency the higher person in two frequencies.Signal generating circuit is reset to according to AC-DC conversion
The feedback voltage of the output voltage of device, the first of the inductive current of AC-DC converter take
Sample signal produces replacement signal with triangular wave signal.Latch unit has setting end, resets
End and output end, set the frenquency signal that end is exported to receives frequency signal selector,
End is reset to be used to receive replacement signal, and output end is used to output pulse width modulation signal best friend
One control end of the switch of stream-direct current transducer.Comparator is used to compare the first sample signal
With upper current limit signal, the voltage swing of upper current limit signal is correspondingly to critical current mode
Value, and whenever the size of the first sample signal reaches the inductance corresponding to upper current limit signal
During current critical value, comparator just controls voltage-controlled oscillator (VCO) by the frequency of second frequency and three
The frequency of angle ripple signal rises above the frequency of first frequency, and controls voltage-controlled oscillator (VCO)
The number of times of critical current mode value is reached according to the first sample signal to be incremented by second frequency and three
The frequency of angle ripple signal.
The present invention also provides a kind of AC-DC converter, and it includes：Bridge rectifier,
Inductance, diode, switch and foregoing power factor correction circuit.Bridge rectifier utensil
There are the first ac input end, the second ac input end, positive output end and negative output terminal, the
One ac input end and the second ac input end are used to be coupled to AC power.The one of inductance
End coupling positive output end.The anode of diode couples the other end of inductance, and its negative electrode is used
As the first voltage output end of AC-DC converter.Switch has first end, the
Two ends and control end, first end couple the other end of inductance, and the second end couples negative output terminal,
Wherein second voltage output end of the negative output terminal as AC-DC converter.
Replacement signal generating circuit in above-described embodiment includes：Voltage error amplifier,
Multiplier, current error amplifier and PWM comparator.Voltage error amplifier is used
To compare feedback voltage and reference voltage, and the first error signal is produced according to this.Multiplier
To whole in all-wave with the input voltage of AC-DC converter according to the first error signal
The second acquired sample signal after stream and produce reference current signal.Current error amplifies
Device is used to benchmark current signal and the first sample signal, and produces the second error according to this
Signal.PWM comparator is used to compare the second error signal and triangular wave signal, and
Produce according to this and reset signal.
In the present invention, whenever the size of the first sample signal reaches upper current limit signal institute
During corresponding critical current mode value, the comparator of power factor correction circuit just controls voltage-controlled shake
Swing device and the frequency of the frequency of second frequency and triangular wave signal is risen above into first frequency
Frequency, and control voltage-controlled oscillator (VCO) to reach critical current mode value according to the first sample signal
Number of times be incremented by the frequency of second frequency and triangular wave signal.Therefore, whenever first takes
When the size of sample signal reaches the critical current mode value corresponding to upper current limit signal, pressure
The frequency for controlling oscillator just raises in time to adjust the switching frequency of switch, and then makes electricity
The amplitude of inducing current reduces and changes the peak value of inductive current, so that the peak of inductive current
Value is less than current upper limit value.
It is that above and other objects of the present invention, feature and advantage can be become apparent,
Preferred embodiment cited below particularly simultaneously coordinates institute's accompanying drawings to be described below in detail.
Brief description of the drawings
Fig. 1 is the schematic diagram of the AC-DC converter of one embodiment of the invention；
Fig. 2 is the schematic diagram of the change of the inductive current of one embodiment of the invention；
Fig. 3 illustrates the another of current sampling circuit and implements aspect；
Fig. 4 illustrates another implementation aspect of current sampling circuit；
Fig. 5 illustrates another implementation aspect again of current sampling circuit.
Specific embodiment
Fig. 1 is the schematic diagram of the AC-DC converter of one embodiment of the invention.Refer to
Fig. 1, AC-DC converter 100 includes bridge rectifier 10, inductance 20, two
Pole pipe 30, switch 40, power factor correction circuit 50, electric capacity 60, voltage sample circuit 80,
Current sampling circuit 90 and rectified waveform sample circuit 903.
Bridge rectifier 10 has the first ac input end, the second ac input end, just defeated
Go out end 11 and negative output terminal 12, the first ac input end is used to the second ac input end
It is coupled to AC power AC.One end of inductance 20 couples through current sampling circuit 90
Positive output end 11.The other end of the anode coupling inductance 20 of diode 30, and its negative electrode
With the first voltage output end as AC-DC converter 100.Switch 40 has
First end 41, the second end 42 and control end 43, first end 41 couple the another of inductance 20
One end, the coupling of the second end 42 negative output terminal 12, wherein negative output terminal 12 is with as friendship
The second voltage output end of stream-direct current transducer 100.In this instance, second voltage output
End is coupling earthing potential GND.Switch 40 can for example use a nmos pass transistor
To realize, wherein the gate of nmos pass transistor is with as foregoing control end 43.So
The present invention is not limited, and under coincident circuit operating principle, switch 40 can also other
Kenel is realized, such as realized with PMOS transistor.In addition, electric capacity 60 is coupled to friendship
Between the first voltage output end and second voltage output end of stream-direct current transducer 100.
The first voltage that voltage sample circuit 80 is coupled to AC-DC converter 100 is defeated
Go out between end and earthing potential, to obtain feedback voltage VFB.This voltage sample circuit
80 is to be realized with resistance R1 and R2.Current sampling circuit 90 is then with electric current sense
Coil 901 and diode 902 is answered to realize, this current sampling circuit 90 is used to inductance
20 inductive current is sampled and obtains the first sample signal S2.As for rectified waveform
Sample circuit 903, it is used to the output signal of bridge rectifier 10 (i.e. bridge rectifier
10 pairs of input voltages from AC power AC of device carry out produced news after full-wave rectification
Number) be sampled and obtain the second sample signal S3.This rectified waveform sample circuit 903
It is to be realized with resistance R3 and R4.
Power factor correction circuit 50 includes frequency generator 51, voltage-controlled oscillator (VCO) 52, frequency
Rate signal selector 53, replacement signal generating circuit 54, latch unit 55 and comparator 56.
Frequency generator 51 is used to produce first frequency CLK1.Voltage-controlled oscillator (VCO) 52 is used to produce
Raw second frequency CLK2 and triangular wave signal S522.Frenquency signal selector 53 is used to connect
Receive first frequency CLK1 and second frequency CLK2, and export first frequency CLK1 and the
Frequency the higher person in two frequency CLK2.Signal generating circuit 54 is reset to according to exchange
The output voltage V of-direct current transducer 100OUTFeedback voltage VFB, inductance 20 electricity
The first sample signal S2 and triangular wave signal S of inducing current522Signal S is reset to produce54。
Latch unit 55 has setting end 551, resets end 552 and output end 553, sets end 551
To the frenquency signal that receives frequency signal selector 53 is exported, reset end 552 and be used to
Receive and reset signal S54, and output end 553 is used to output pulse width modulation signal S57To opening
Close 40 control end 43, and then controlling switch 40 open/close states.Comparator 56 is used
To compare the first sample signal S2 and upper current limit signal S1, and whenever the first sampling news
When the size of number S2 reaches the critical current mode value corresponding to upper current limit signal S1,
Comparator 56 just controls voltage-controlled oscillator (VCO) 52 by the frequency and triangle of second frequency CLK2
Ripple signal S522Frequency rise above the frequency of first frequency CLK1, and control pressure
Control oscillator 52 reaches the number of times of critical current mode value to pass according to the first sample signal S2
Increase second frequency CLK2 and triangular wave signal S522Frequency.
In the present embodiment, reset signal generating circuit 54 and include voltage error amplifier
542nd, multiplier 544, current error amplifier 546, PWM comparator 548 with
Electric capacity 549.Voltage error amplifier 542 is used to compare feedback voltage VFBWith reference electricity
Pressure VREF, and the first error signal S is produced according to this543.Multiplier 544 is to according to the
One error signal S543Reference current signal S is produced with the second sample signal S3545.Electricity
Stream error amplifier 546 is used to benchmark current signal S545With the first sample signal
S2, and the second error signal S is produced according to this547.PWM comparator 548 is used to compare
Compared with the second error signal S547With triangular wave signal S522, and replacement signal S is produced according to this54。
In other embodiments, the triangular wave signal S produced by voltage-controlled oscillator (VCO) 52522
It can be sawtooth waveforms signal.Additionally, foregoing latch unit 55 can using SR latch units come
Realize.The right present invention is not limited, under coincident circuit operating principle, latch unit 55
Also can be realized using the latch unit of other kenels or replacement circuit.
Fig. 2 is the schematic diagram of the change of the inductive current of one embodiment of the invention.Please merge
Reference picture 1 and Fig. 2.As shown in time section T1, inductance 20 inductive current with
When the change of voltage and being gradually increasing, because middle comparator 56 can judge during this section
The peak value for going out the inductor current value 70 corresponding to the first sample signal S2 not yet reaches electric current
Critical current mode value 60 corresponding to upper limit signal S1 so that comparator 56 will not go
Voltage-controlled oscillator (VCO) 52 is controlled by the frequency of second frequency CLK2 and triangular wave signal S522
Frequency rise above the frequency of first frequency CLK1, therefore latch unit 55 can foundation
The first frequency CLK1 that frenquency signal selector 53 is exported and replacement signal S54To produce
The relatively low pulse width modulation signal S of raw frequency57, with using pulse width modulation signal S57To control
The open/close states of switch 40.
And as shown in time section T2, with average value (such as label 71 of inductive current
It is shown) critical current mode value 60 is gradually approached, due to the middle comparator 56 during this section
Can judge that the peak value of the inductor current value 70 corresponding to the first sample signal S2 has reached
Critical current mode value 60 corresponding to upper current limit signal S1 so that the meeting of comparator 56
Control voltage-controlled oscillator (VCO) 52 is removed by the frequency of second frequency CLK2 and triangular wave signal S522
Frequency rise above the frequency of first frequency CLK1, therefore latch unit 55 can foundation
The second frequency CLK2 that frenquency signal selector 53 is exported and replacement signal S54To produce
Raw frequency pulse width modulation signal S higher57, with using pulse width modulation signal S57To improve
The switching frequency of switch 40, to reduce the amplitude of inductive current, and then suppresses inductance electricity
The peak value of stream.
Next, as shown in time section T3, inductance 20 inductive current with electricity
The change of pressure and when being gradually reduced, because middle comparator 56 can be judged during this section again
The peak value of the inductor current value 70 corresponding to the first sample signal S2 is not up to upper current limit
Critical current mode value 60 corresponding to signal S1 so that comparator 56 will not go control
Voltage-controlled oscillator (VCO) 52 is by the frequency of second frequency CLK2 and triangular wave signal S522Frequency
The frequency of first frequency CLK1 is risen above, therefore latch unit 55 can be according to frequency news
The first frequency CLK1 that number selector 53 is exported with reset signal S54To produce frequency
Relatively low pulse width modulation signal S57, with using pulse width modulation signal S57Carry out controlling switch 40
Open/close states.
Refer to Fig. 3 to Fig. 5.Fig. 3 to Fig. 5 shows current sampling circuit respectively
Other implement aspect.As shown in figure 3, current sampling circuit 91 is by the electric current line of induction
Circle 911 and diode 912 constituted, and the coupling mode of this current sampling circuit 91 with
The coupling mode of current sampling circuit 90 is different.And as shown in figure 4, current sampling circuit
92 is to be realized with a resistance.As for the current sampling circuit 93 shown in Fig. 5, it is also
Realized with a resistance, and the coupling mode and current sampling circuit of current sampling circuit 93
92 coupling mode is different.Because Fig. 3 to Fig. 5 all clearly shows each current sampling
The coupling mode of circuit, just repeats no more herein.
In sum, in the present invention, whenever the size of the first sample signal reaches electric current
During critical current mode value corresponding to upper limit signal, the comparator of power factor correction circuit is just
Control voltage-controlled oscillator (VCO) improves to big the frequency of second frequency and the frequency of triangular wave signal
In the frequency of first frequency, and voltage-controlled oscillator (VCO) is controlled to reach inductance according to the first sample signal
The number of times of current critical value is incremented by the frequency of second frequency and triangular wave signal.Therefore,
Whenever the inductive current that the size of the first sample signal is reached corresponding to upper current limit signal faces
During dividing value, the frequency of voltage-controlled oscillator (VCO) is just raised in time to adjust the switching frequency of switch,
And then the amplitude of inductive current is reduced and is changed the peak value of inductive current, so that inductance
The peak value of electric current is less than current upper limit value.Peak value by limitation inductive current of the invention,
So that Inductive component is not easy saturation, and then it is able in circuit using relatively low specified
Inductive component and power switch.
Although the present invention is disclosed above with preferred embodiment, so it is not limited to this
Invention, it is any to be familiar with this those skilled in the art, without departing from the spirit and scope of the present invention, when
A little change and retouching can be made, therefore it is claim institute that protection scope of the present invention is worked as
The scope for defining is defined.
Claims (10)
1. a kind of power factor correction circuit a, it is adaptable to AC-DC converter, it is characterised in that
Including：
One frequency generator, is used to produce a first frequency；
One voltage-controlled oscillator (VCO), is used to produce a second frequency and a triangular wave signal；
One frenquency signal selector, is used to receive the first frequency and the second frequency, and
The first frequency is exported with frequency the higher person in the second frequency；
One resets signal generating circuit, to according to an output of the AC-DC converter
The one of one feedback voltage of voltage, an inductive current of the AC-DC converter
One sample signal produces a replacement signal with the triangular wave signal；
One latch unit, end, a replacement end and an output end, the setting end are set with one
It is used to receive the frenquency signal that the frenquency signal selector is exported, the replacement end is used
To receive the replacement signal, and the output end is used to export a pulse width modulation signal extremely
One control end of one switch of the AC-DC converter；And
One comparator, is used to compare first sample signal and a upper current limit signal, should
The voltage swing of upper current limit signal is corresponding to a critical current mode value, and whenever
The size of first sample signal reaches the electricity corresponding to the upper current limit signal
During inducing current critical value, the comparator just controls the voltage-controlled oscillator (VCO) by second frequency
The frequency of rate rises above the first frequency with the frequency of the triangular wave signal
Frequency, and control the voltage-controlled oscillator (VCO) to reach inductance electricity according to first sample signal
The number of times of critical value is flowed to be incremented by the frequency of the second frequency and the triangular wave signal.
2. power factor correction circuit as claimed in claim 1, it is characterised in that the replacement signal
Producing circuit includes：
One voltage error amplifier, is used to compare the feedback voltage and a reference voltage, and
One first error signal is produced according to this；
One multiplier, to according to first error signal and the AC-DC converter
One input voltage is produced in one second sample signal acquired after full-wave rectification
One reference current signal；
One current error amplifier, is used to compare the reference current signal with first sampling
Signal, and one second error signal is produced according to this；And
One PWM comparator, is used to compare second error signal with triangular wave news
Number, and the replacement signal is produced according to this.
3. power factor correction circuit as claimed in claim 1, it is characterised in that the triangular wave is interrogated
Number include a sawtooth waveforms signal.
4. power factor correction circuit as claimed in claim 1, it is characterised in that the switch includes
One nmos pass transistor, and the control end is a gate of the nmos pass transistor.
5. power factor correction circuit as claimed in claim 1, it is characterised in that the latch unit bag
Include a SR latch units.
6. a kind of AC-DC converter, it is characterised in that including：
One bridge rectifier, with one first ac input end, one second ac input end,
One positive output end and a negative output terminal, first ac input end second are exchanged with this
Input is used to be coupled to an AC power；
One inductance, its one end couples the positive output end；
One diode, its anode couples the other end of the inductance, and its negative electrode with as
One first voltage output end of the AC-DC converter；
One switch, with a first end, one second end and a control end, the first end coupling
The other end of the inductance is connect, second end couples the negative output terminal, wherein this is negative defeated
Go out a second voltage output end of the end as the AC-DC converter；And
One power factor correction circuit, it includes：
One frequency generator, is used to produce a first frequency；
One voltage-controlled oscillator (VCO), is used to produce a second frequency and a triangular wave signal；
One frenquency signal selector, is used to receive the first frequency and the second frequency,
And the first frequency is exported with frequency the higher person in the second frequency；
One resets signal generating circuit, to according to the one of the AC-DC converter
One first sampling of one feedback voltage of output voltage, an inductive current of the inductance
Signal produces a replacement signal with the triangular wave signal；
One latch unit, end, a replacement end and an output end, the setting are set with one
End is used to receive the frenquency signal that the frenquency signal selector is exported, the replacement end
It is used to receive the replacement signal, and the output end is used to export a pulse width modulation signal
To the control end of the switch；And
One comparator, is used to compare first sample signal and a upper current limit signal,
The voltage swing of the upper current limit signal is corresponding to a critical current mode value, and often
When the size of first sample signal reaches being somebody's turn to do corresponding to the upper current limit signal
During critical current mode value, the comparator just control the voltage-controlled oscillator (VCO) by this second
The frequency of frequency rises above the first frequency with the frequency of the triangular wave signal
Frequency, and control the voltage-controlled oscillator (VCO) to reach the inductance according to first sample signal
The number of times of current critical value is incremented by the frequency of the second frequency and the triangular wave signal
Rate.
7. AC-DC converter as claimed in claim 6, it is characterised in that the replacement is interrogated
Number produce circuit include：
One voltage error amplifier, is used to compare the feedback voltage and a reference voltage, and
One first error signal is produced according to this；
One multiplier, to according to first error signal and the AC-DC converter
One input voltage is produced in one second sample signal acquired after full-wave rectification
One reference current signal；
One current error amplifier, is used to compare the reference current signal with first sampling
Signal, and one second error signal is produced according to this；And
One PWM comparator, is used to compare second error signal with triangular wave news
Number, and the replacement signal is produced according to this.
8. AC-DC converter as claimed in claim 6, it is characterised in that the triangular wave
Signal includes a sawtooth waveforms signal.
9. AC-DC converter as claimed in claim 6, it is characterised in that the switch bag
A nmos pass transistor is included, and the control end is a gate of the nmos pass transistor.
10. AC-DC converter as claimed in claim 6, it is characterised in that the latch unit
Including a SR latch units.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510973805.9A CN106899202A (en) | 2015-12-18 | 2015-12-18 | AC-DC converter and its power factor correction circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510973805.9A CN106899202A (en) | 2015-12-18 | 2015-12-18 | AC-DC converter and its power factor correction circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106899202A true CN106899202A (en) | 2017-06-27 |
Family
ID=59190351
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510973805.9A Pending CN106899202A (en) | 2015-12-18 | 2015-12-18 | AC-DC converter and its power factor correction circuit |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101090234A (en) * | 2006-06-16 | 2007-12-19 | 富士通株式会社 | Step-up/step-down type dc-dc converter, and control circuit and control method of the same |
| CN101557167A (en) * | 2009-02-25 | 2009-10-14 | 西南交通大学 | Bifrequency control method of switch power supply and device thereof |
| US20090302820A1 (en) * | 2008-06-10 | 2009-12-10 | Ricoh Company, Ltd. | Switching regulator |
| CN101854116A (en) * | 2009-04-02 | 2010-10-06 | 辉芒微电子（深圳）有限公司 | Power factor correcting device and controller and THD (Total Harmonic Distortion) attenuator used therein |
| CN102594118A (en) * | 2012-02-29 | 2012-07-18 | 杭州矽力杰半导体技术有限公司 | Boost PFC controller |
| CN103280965A (en) * | 2011-09-14 | 2013-09-04 | 矽力杰半导体技术(杭州)有限公司 | Power factor correction control circuit capable of reducing EMI |
-
2015
- 2015-12-18 CN CN201510973805.9A patent/CN106899202A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101090234A (en) * | 2006-06-16 | 2007-12-19 | 富士通株式会社 | Step-up/step-down type dc-dc converter, and control circuit and control method of the same |
| US20090302820A1 (en) * | 2008-06-10 | 2009-12-10 | Ricoh Company, Ltd. | Switching regulator |
| CN101557167A (en) * | 2009-02-25 | 2009-10-14 | 西南交通大学 | Bifrequency control method of switch power supply and device thereof |
| CN101854116A (en) * | 2009-04-02 | 2010-10-06 | 辉芒微电子（深圳）有限公司 | Power factor correcting device and controller and THD (Total Harmonic Distortion) attenuator used therein |
| CN103280965A (en) * | 2011-09-14 | 2013-09-04 | 矽力杰半导体技术(杭州)有限公司 | Power factor correction control circuit capable of reducing EMI |
| CN102594118A (en) * | 2012-02-29 | 2012-07-18 | 杭州矽力杰半导体技术有限公司 | Boost PFC controller |
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Application publication date: 20170627 |