CN103117654A - Active power-factor correction circuit and related controller - Google Patents
Active power-factor correction circuit and related controller Download PDFInfo
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- CN103117654A CN103117654A CN2011103649566A CN201110364956A CN103117654A CN 103117654 A CN103117654 A CN 103117654A CN 2011103649566 A CN2011103649566 A CN 2011103649566A CN 201110364956 A CN201110364956 A CN 201110364956A CN 103117654 A CN103117654 A CN 103117654A
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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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- 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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention provides an active power-factor correction circuit device which comprises a segment linear gain circuit, an error amplifier, a pulse width modulation controller and a pulse width modulation signal generator. The segment linear gain circuit is used for receiving feed-forward signals and generating corresponding gain signals, wherein sizes of the gain signals and sizes of the feed-forward signals are correlated in a broken line mode. The error amplifier is used for generating error signals according to output voltage of an alternating-current-to-direct-current converter. The pulse width controller is used for generating control signals according to the gain signals, the error signals, and the output voltage after being rectified of the alternating-current-to-direct-current converter. The pulse width modulation signal generator is used for generating pulse width modulation signals used for controlling a power switch of the alternating-current-to-direct-current converter according to the control signals. As a segment linear gain circuit is utilized to replace a traditional squarer, circuit complexity of an active power-factor correction circuit can be lowered, needed bias voltage sources are reduced, a circuit area is reduced, and electricity power consumption and cost are lowered.
Description
Technical field
The relevant circuit of power factor correction of the present invention, espespecially a kind of control circuit for active circuit of power factor correction.
Background technology
Due to the problem of energy worsening shortages, impel people more and more to pay attention to the power consumption efficiency of electronic installation.Traditional AC to DC converter is reached with diode rectification mostly, although this kind framework is simple and cost is low, the serious nonlinear distortion due to input current causes low-frequency harmonics to roll up, cause power factor (power factor, PF) low.Power factor refers to the ratio between effective power and apparent power (apparent power), is the index of weighing electric power utilization ratio height.Power factor is low causes the meaningless waste of the energy except meeting, and a large amount of harmonic waves also can cause the puzzlement of the unstable and generator of electric power system, and has a strong impact on the quality of power supply.
Power factor correction (power factor correction, PFC) circuit all can be set to improve power factor in many AC to DC converter.Change the circuit framework that circuit of power factor correction often can adopt input voltage feed forward to control along with the size of input voltage for fear of power output.Such circuit framework need to utilize squarer (squarer) to calculate the square value of input voltage, and collocation multiplier and divider produce required control signal.
Yet the complex circuit designs degree of squarer is high, circuit area that take is large, manufacturing cost is high, often very power consumption again, thereby at the power consumption efficiency that improves circuit of power factor correction with further dwindle and caused obstruction aspect the circuit chip size.
Summary of the invention
In view of this, how to realize circuit of power factor correction in the situation that omit squarer with the framework of more simplifying, change along with the size of input voltage to avoid power output, real is problems to be solved.
This specification provides a kind of embodiment of active circuit of power factor correction, be used for proofreading and correct the power factor of an AC to DC converter, wherein this AC to DC converter includes an inductance and a power switch, this active circuit of power factor correction includes: a fragment linear gain circuit, when being coupled to this AC to DC converter, be used for receiving a feed-forward signal and producing a corresponding gain signal, wherein the size of this gain signal and this feed-forward signal can present the correlation of polyline shaped; One error amplifier when being coupled to this AC to DC converter, is used for producing an error signal according to an output voltage of this AC to DC converter; One PWM controller when being coupled to this AC to DC converter, is used for according to the input voltage after this gain signal, this error signal and this AC to DC converter rectification, produces a control signal; And a pulse-width modulation signal generator, be coupled to this PWM controller, be used for producing in order to control the pulse-width modulation signal of this power switch according to this control signal.
this specification separately provides a kind of embodiment of the controller for active circuit of power factor correction, be used for controlling a pulse-width modulation signal generator of this active circuit of power factor correction, this controller includes: a fragment linear gain circuit, when this active circuit of power factor correction is coupled to an AC to DC converter, be used for receiving a feed-forward signal, if and this feed-forward signal is less than a threshold values, this feed-forward signal is applied one first and gain to produce a gain signal, if and this feed-forward signal is greater than this threshold values, this feed-forward signal is applied one second and gain to produce this gain signal, wherein this second gain is greater than this first gain, one error amplifier when being coupled to this AC to DC converter, is used for producing an error signal according to an output voltage of this AC to DC converter, an and PWM controller, when being coupled to this AC to DC converter, be used for according to the input voltage after this gain signal, this error signal and this AC to DC converter rectification, produce a control signal to control this pulse-width modulation signal generator.
Aforesaid active circuit of power factor correction and controller utilize the fragment linear gain circuit to replace traditional squarer, can reduce the complexity of circuit framework, and significantly reduce required bias generator, thus circuit area can effectively be dwindled, and reduce electrical power consumed and manufacturing cost required when operating.
Be similar to very much the square value of feed-forward signal size due to the size of the gain signal of aforementioned fragment linear gain circuit output, therefore PWM controller can avoid the power output of AC to DC converter to change along with the size of input voltage the gain signal action of error signal divided by the output of fragment linear gain circuit.
Description of drawings
Fig. 1 is the functional block diagram after an embodiment of the present invention's AC to DC converter simplifies.
Fig. 2 is the functional block diagram after an embodiment of the fragment linear gain circuit in Fig. 1 simplifies.
[primary clustering symbol description]
100 AC to DC converter
102 AC power
104 loads
111 bridge rectifiers
112 low pass filters
113 inductance
114 diodes
115 electric capacity
116,236,246 switches
120 active circuit of power factor correction
122 pulse-width modulation signal generators
124 controllers
130 fragment linear gain circuit
140 error amplifiers
150 PWM controller
210 comparison circuits
220 transduction circuits
230 amplification modules
232,234 amplifiers
240 current adjusting module
242,244 electric current grooves
250 resistance
Embodiment
Below will coordinate correlative type that the present invention's embodiment is described.In these were graphic, identical label represented same or similar assembly or process step.
Used some vocabulary to censure specific assembly in the middle of specification and follow-up claim.The person with usual knowledge in their respective areas should understand, and same assembly may be called with different nouns.This specification and follow-up claim are not used as distinguishing the mode of assembly with the difference of title, but the benchmark that the difference on function is used as distinguishing with assembly.In the middle of specification and follow-up claim, be an open term mentioned " comprising " in the whole text, therefore should be construed to " comprise but be not limited to ... ".In addition, " couple " word this comprise any directly and indirectly connect means.Therefore, be coupled to one second assembly if describe one first assembly in literary composition, representing that this first assembly can directly (comprise through signal connected modes such as electric connection or wireless transmission, optical delivery) is connected in this second assembly, or see through other assembly or connection means indirectly electrically or signal be connected to this second assembly.
Used herein " and/or " describing mode, comprise cited one of them or the combination in any of a plurality of projects.In addition, unless specialize in this specification, the term of any odd number lattice all comprises the connotation of plural lattice simultaneously.
Please refer to Fig. 1, its illustrate is the functional block diagram after simplifying into the AC to DC converter 100 of one embodiment of the invention.The alternating voltage Vac that AC to DC converter 100 is used for AC power 102 is provided converts VD Vout to, to offer load 104.In the present embodiment, AC to DC converter 100 includes bridge rectifier 111, low pass filter 112, inductance 113, diode 114, output capacitance 115, power switch (power switch) 116 and active circuit of power factor correction (power factor correction circuit, PFC circuit) 120.
Bridge rectifier 111 is used for the alternating voltage Vac that AC power 102 provides is rectified into the input voltage vin of m shape ripple.Low pass filter 112 is coupled to the output of bridge rectifier 111, is used for input voltage vin is carried out filtering the feed-forward signal Sff that is directly proportional to the mean value of input voltage vin to produce size.Inductance 113 and diode 114 are coupled between the output and load 104 of bridge rectifier 111.Output capacitance 115 is coupled to diode 114.One end of power switch 116 is coupled between inductance 113 and diode 114, and switches according to the control of active circuit of power factor correction 120.On implementation, power switch 116 can be realized with transistor.
When power switch 116 conductings (on), the diode 114 of AC to DC converter 100 is in the reverse bias cut-off state, and input current Iin can flow to power switch 116 via inductance 113.At this moment, input voltage vin can make inductive current IL linear rising the gradually to inductance 113 chargings, until power switch 116 cut-offs (off).At this moment, the required energy of load 104 is supplied by output capacitance 115.
When power switch 116 cut-off, the polarity of voltage on inductance 113 can be anti-phase, and add that input voltage vin charges via 114 pairs of output capacitances 115 of diode.At this moment, output capacitance 115 is to be in charged state, and inductive current IL can descend gradually, until power switch 116 conducting once again.In this stage, output voltage V out can keep fixing, and its size adds the voltage of inductance 113 for input voltage vin.
As shown in Figure 1, active circuit of power factor correction 120 includes pulse-width modulation signal generator 122 and controller (PFC controller) 124.Controller 124 includes fragment linear gain circuit (piecewise linear gain circuit) 130, error amplifier 140 and PWM controller (PWM controller) 150.When active circuit of power factor correction 120 is coupled to AC to DC converter 100, fragment linear gain circuit 130 is used for receiving the feed-forward signal Sff of low pass filter 112 outputs, and produces the gain signal Sg that size is similar to the square value of feed-forward signal Sff.Error amplifier 140 is used for producing error signal Sea according to the output voltage V out of AC to DC converter 100.For example, error amplifier 140 can with reference to voltage Vref with and the feedback voltage of output voltage V out with a proportionate relationship compare, and resulting difference value is amplified to produce error signal Sea.PWM controller 150 is coupled to fragment linear gain circuit 130 and error amplifier 140, be used for producing control signal Scom according to gain signal Sg, error signal Sea and input voltage vin, and the size that makes control signal Scom is proportional to the size of error signal Sea and input voltage vin, and is inversely proportional to the size of gain signal Sg.On implementation, PWM controller 150 can be multiplier-divider (multiplier-divider), in order to the error signal Sea of the error amplifier 140 output gain signal Sg divided by 130 outputs of fragment linear gain circuit, and resulting numerical value be multiply by again the size of the input voltage vin after rectification, to produce control signal Scom.Perhaps, also can utilize other circuit framework to realize the function of PWM controller 150.122 of pulse-width modulation signal generators can produce pulse-width modulation signal PWM with the switching action of power ratio control switch 116 according to control signal Scom.
In the present embodiment, as feed-forward signal Sff during less than threshold values Vth, fragment linear gain circuit 130 can apply first to feed-forward signal Sff and gain to produce gain signal Sg, and as feed-forward signal Sff during more than or equal to threshold values Vth, 130 of fragment linear gain circuit can apply second to feed-forward signal Sff and gain to produce gain signal Sg, wherein, aforesaid the second gain is greater than the first gain.Thus, will make the size of gain signal Sg and feed-forward signal Sff present the correlation of polyline shaped, that is present the characteristic of fragment linearity.The Fig. 2 that below will arrange in pairs or groups further illustrates enforcement and the function mode of fragment linear gain circuit 130.
Fig. 2 is the functional block diagram after the fragment linear gain circuit 130 of one embodiment of the invention is simplified.As shown in Figure 2, fragment linear gain circuit 130 includes comparison circuit 210, transduction circuit (transconductance circuit) 220, amplification module 230, current adjusting module 240 and resistance 250.Transduction circuit 220 is used for converting feed-forward signal Sff to current signal, to produce the feedforward electric current I ff that is directly proportional to the voltage swing of feed-forward signal Sff.Amplification module 230 is coupled to the output of transduction circuit 220, is used for electric current I ff is amplified to produce the electric current that is directly proportional to the voltage swing of feed-forward signal Sff.Current adjusting module 240 couples output and the comparison circuit 210 of amplification module 230, is used for drawing electric current.When running, comparison circuit 210 can compare feed-forward signal Sff and threshold values Vth, and adjusts total output current size of amplification module 230 and the total current amount of drawing of adjusting current adjusting module 240 according to result relatively.
In the embodiment of Fig. 2, amplification module 230 includes amplifier 232, amplifier 234 and switch 236, and current adjusting module 240 includes electric current groove (current sink) 242, electric current groove 244 and switch 246.Amplifier 232 is used for amplified current Iff to produce the current i 1 that is directly proportional to the voltage swing of feed-forward signal Sff.Amplifier 234 is used for amplified current Iff to produce the current i 2 that is directly proportional to the voltage swing of feed-forward signal Sff.Electric current groove 242 is coupled to the output of amplifier 232, is used for drawing the first scheduled current amount i3.Electric current groove 244 is used for drawing the second scheduled current amount i4.Switch 236 is coupled between the output and electric current groove 242 of amplifier 234, current i 2 can be coupled to the input of electric current groove 242 when conducting.Switch 246 is coupled between the output and electric current groove 244 of amplifier 232, current i 1 can be coupled to the input of electric current groove 244 when conducting.
In the present embodiment, as feed-forward signal Sff during less than threshold values Vth, comparison circuit 210 can be arranged to not on-state with switch 236, make total output current of amplification module 230 become i1, and switch 246 also is arranged to not on-state, make the total current amount of drawing of current adjusting module 240 become i3.As feed-forward signal Sff during more than or equal to threshold values Vth, 210 of comparison circuits can be arranged to conducting state with switch 236, make total output current of amplification module 230 become i1+i2, and switch 246 also is arranged to conducting state, makes the total current amount of drawing of current adjusting module 240 become i3+i4.
Thus, during less than threshold values Vth, the size of the output current i5 of fragment linear gain circuit 130 can equal i1-i3 as feed-forward signal Sff.At this moment, the magnitude of voltage of the gain signal Sg of fragment linear gain circuit 130 outputs can be represented by the formula:
Sg=(G1 * Vin-i3) * R formula (1)
Wherein G1 is the transduction gain of amplifier 232, and R is the resistance value of resistance 250.By formula (1) as can be known, during less than threshold values Vth, the size of gain signal Sg and feed-forward signal Sff can be linear positive correlation as feed-forward signal Sff.
During more than or equal to threshold values Vth, the size of the output current i5 of fragment linear gain circuit 130 can equal i1+i2-i3-i4 as feed-forward signal Sff.At this moment, the magnitude of voltage of the gain signal Sg of fragment linear gain circuit 130 outputs can be represented by the formula:
Sg=[(G1+G2) * Vin-(i3+i4)] * R formula (2)
Wherein G2 is the transduction gain of amplifier 234.By formula (2) as can be known, during more than or equal to threshold values Vth, the size of gain signal Sg and feed-forward signal Sff also can be linear positive correlation as feed-forward signal Sff, but the yield value of gain signal Sg can be than feed-forward signal Sff be greater during less than threshold values Vth.
Can find out from aforementioned formula (1) and the explanation of formula (2), the size of gain signal Sg and feed-forward signal Sff can present the correlation of polyline shaped, that is presents the characteristic of fragment linearity.By the component parameter of suitably selecting in fragment linear gain circuit 130, just can produce with fragment linear gain circuit 130 result of calculation of approximate squarer.
For example, suppose that the voltage range of feed-forward signal Sff is between 0.8～2.5V, in one embodiment, the gain G 2 of the gain G 1 of amplifier 232 and amplifier 234 all can be made as 1.1, with threshold values Vth be made as 1.65V, magnitude of current i3 that electric current groove 242 is drawn is made as 0.6 * Iff and the magnitude of current i4 that electric current groove 244 draws is made as 1.8 * Iff.Under such setting, the size of gain signal Sg will be similar to very much feed-forward signal Sff size square.If the voltage range of feed-forward signal Sff is different from the example of front, can by suitably adjusting the mode of the component parameter of fragment linear gain circuit 130, make fragment linear gain circuit 130 produce the result of calculation of approximate squarer equally.
Therefore, aforesaid fragment linear gain circuit 130 can be used to replace traditional squarer, and its circuit framework is simple more than traditional squarer, and significantly reduce required bias generator, therefore can effectively dwindle the circuit area of controller 124, and required electrical power consumed and manufacturing cost when reducing by 120 running of active circuit of power factor correction.
As previously mentioned, PWM controller 150 in controller 124 can be exported the error signal Sea of error amplifier 140 outputs divided by fragment linear gain circuit 130 gain signal Sg, and resulting numerical value be multiply by again the size of the input voltage vin after rectification, to produce control signal Scom.On implementation, controller 124 can adopt with input voltage vin has the magnitude of voltage of a proportionate relationship or the size that electric current I ac represents input voltage vin.Pulse-width modulation signal generator 122 can produce corresponding pulse-width modulation signal PWM according to control signal Scom, and the switching action with power ratio control switch 116 makes input current Iin follow control signal Scom and changes.Because the waveform of control signal Scom can be identical with the waveform of input voltage vin, therefore front control mode of taking off can make the waveform of input current Iin follow the wave form varies of input voltage vin, and then the bring to power factor.
In addition, be similar to very much the square value of feed-forward signal Sff size due to the size of the gain signal Sg of fragment linear gain circuit 130 output, therefore PWM controller 150 can avoid the power output of AC to DC converter 100 to change along with the size of input voltage vin the action of error signal Sea divided by the gain signal Sg of fragment linear gain circuit 130 outputs equally.
In the aforementioned embodiment, the scope of the feed-forward signal Sff that fragment linear gain circuit 130 can input is divided into two sections and applies respectively different gains so that the size of the gain signal Sg that produces be similar to feed-forward signal Sff size square.This is only an embodiment, but not limits to actual execution mode of the present invention.On implementation, fragment linear gain circuit 130 also can be set up more comparison circuit, amplifier and switch module, be divided into more Multi sectional with the scope with feed-forward signal Sff, and apply respectively with different linear gains, make the size of gain signal Sg and feed-forward signal Sff more level off to quadratic relationship.
In another embodiment, fragment linear gain circuit 130 also can only arrange the amplifier of a gain adjustable and the electric current groove that capable of regulating draws size of current.When feed-forward signal Sff is positioned at different scopes, adopts different amplifier gains and/or make the electric current groove draw different current values, to produce required gain signal Sg.
In another embodiment, the feed-forward signal Sff of low pass filter 112 generations is signals of current forms.At this moment, the transduction circuit 220 in fragment linear gain circuit 130 can be omitted.
At other embodiment, fragment linear gain circuit 130 also can adopt one or more transduction circuits, one or more amplifier and/or one or more electric current groove, when making feed-forward signal Sff be positioned at different scopes, can produce the gain signal Sg of different gains.
The above only is the present invention's preferred embodiment, and all equalizations of being done according to the present patent application the scope of the claims change and modify, and all should belong to the present invention's covering scope.
Claims (14)
1. active circuit of power factor correction, the power factor that is used for proofreading and correct an AC to DC converter, wherein this AC to DC converter includes an inductance and a power switch, and this active circuit of power factor correction includes:
One fragment linear gain circuit when being coupled to this AC to DC converter, is used for receiving a feed-forward signal and producing a corresponding gain signal, and wherein the size of this gain signal and this feed-forward signal can present the correlation of polyline shaped;
One error amplifier when being coupled to this AC to DC converter, is used for producing an error signal according to an output voltage of this AC to DC converter;
One PWM controller when being coupled to this AC to DC converter, is used for according to the input voltage after this gain signal, this error signal and this AC to DC converter rectification, produces a control signal; And
One pulse-width modulation signal generator is coupled to this PWM controller, is used for producing in order to control the pulse-width modulation signal of this power switch according to this control signal.
2. active circuit of power factor correction as claimed in claim 1, wherein this control signal can be proportional to the size of this error signal and this input voltage, and is inversely proportional to the size of this gain signal.
3. active circuit of power factor correction as claimed in claim 2, wherein this feed-forward signal is that a low pass filter by this AC to DC converter is produced according to this input voltage.
4. active circuit of power factor correction as claimed in claim 3, if wherein this feed-forward signal is less than a threshold values, this fragment linear gain circuit can apply one first to this feed-forward signal and gain to produce this gain signal, if and this feed-forward signal is greater than this threshold values, this fragment linear gain circuit can apply one second to this feed-forward signal and gains to produce this gain signal.
5. active circuit of power factor correction as claimed in claim 4, wherein this second gain is greater than this first gain.
6. controller that is used for active circuit of power factor correction is used for controlling a pulse-width modulation signal generator of this active circuit of power factor correction, and this controller includes:
One fragment linear gain circuit, when this active circuit of power factor correction is coupled to an AC to DC converter, be used for receiving a feed-forward signal, if and this feed-forward signal is less than a threshold values, this feed-forward signal is applied one first and gain to produce a gain signal, if and this feed-forward signal is greater than this threshold values, this feed-forward signal being applied one second gains to produce this gain signal, and wherein this second gain is greater than this first gain;
One error amplifier when being coupled to this AC to DC converter, is used for producing an error signal according to an output voltage of this AC to DC converter; And
One PWM controller when being coupled to this AC to DC converter, is used for according to the input voltage after this gain signal, this error signal and this AC to DC converter rectification, produces a control signal to control this pulse-width modulation signal generator.
7. controller as claimed in claim 6, wherein this fragment linear gain circuit includes:
One amplification module is for generation of the electric current that is directly proportional to the voltage swing of this feed-forward signal;
One current adjusting module is coupled to the output of this amplification module, is used for drawing electric current; And
One comparison circuit is coupled to amplification module and this current adjusting module, is used for this feed-forward signal and this threshold values are compared, and adjusts total output current size of this amplification module and the total current amount of drawing of adjusting this current adjusting module according to result relatively.
8. controller as claimed in claim 7, wherein this amplification module includes:
One first amplifier is for generation of one first electric current that is directly proportional to the voltage swing of this feed-forward signal;
One second amplifier is for generation of one second electric current that is directly proportional to the voltage swing of this feed-forward signal; And
One first switch is coupled between the output and this current adjusting module of this second amplifier, this second electric current can be coupled to the input of this current adjusting module when conducting;
Wherein when this feed-forward signal during less than this threshold values, this comparison circuit can be arranged to not on-state with this first switch, and when this feed-forward signal during greater than this threshold values, this comparison circuit can be arranged to conducting state with this first switch.
9. controller as claimed in claim 8, wherein this current adjusting module includes:
One first electric current groove is coupled to the output of this first amplifier, is used for drawing one first scheduled current amount;
One second electric current groove is used for drawing one second scheduled current amount; And
One second switch is coupled between the output and this second electric current groove of this first amplifier, this first electric current can be coupled to the input of this second electric current groove when conducting;
Wherein when this feed-forward signal during less than this threshold values, this comparison circuit can be arranged to not on-state with this second switch, and when this feed-forward signal during greater than this threshold values, this comparison circuit can be arranged to conducting state with this second switch.
10. controller as claimed in claim 9 wherein when this first switch conduction, can be coupled to this second electric current the input of this this first electric current groove.
11. controller as claimed in claim 9, wherein this second scheduled current amount is greater than this first scheduled current amount.
12. controller as claimed in claim 11, wherein the voltage range of this feed-forward signal between the gain of the gain of 0.8～2.5V, this first amplifier and this second amplifier be all 1.1, this threshold values is 1.65V and this second scheduled current amount is 3 times of this first scheduled current amount.
13. controller as claimed in claim 7, wherein this fragment linear gain circuit separately includes:
One transduction circuit is coupled to the input of this amplification module, is used for converting this feed-forward signal to current signal, to produce a front supply current that is directly proportional to the voltage swing of this feed-forward signal.
14. controller as claimed in claim 13, wherein this amplification module at this feed-forward signal the total output current size during greater than this threshold values, 2 times during less than this threshold values at this feed-forward signal, and this current adjusting module is the total current amount of drawing during greater than this threshold values at this feed-forward signal, is 3 times during less than this threshold values at this feed-forward signal.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107579655A (en) * | 2016-07-05 | 2018-01-12 | 台达电子工业股份有限公司 | Have the microwave generator of power factor correcting and its applicable control method |
| CN111416515A (en) * | 2020-04-27 | 2020-07-14 | 亚瑞源科技（深圳）有限公司 | Power factor correction circuit with burst setting and method of operating the same |
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| CN101562922A (en) * | 2009-05-31 | 2009-10-21 | 南京航空航天大学 | High brightness LED driving power without electrolytic capacitor |
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| CN1953307A (en) * | 2004-10-21 | 2007-04-25 | St微电子公司 | Device for the power factor correction in forced switching power supply units |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107579655A (en) * | 2016-07-05 | 2018-01-12 | 台达电子工业股份有限公司 | Have the microwave generator of power factor correcting and its applicable control method |
| US10476433B2 (en) | 2016-07-05 | 2019-11-12 | Delta Electronics, Inc. | Microwave generator with power factor correction function and control method thereof |
| CN107579655B (en) * | 2016-07-05 | 2020-06-05 | 台达电子工业股份有限公司 | Microwave generating device with power factor correction and applicable control method thereof |
| CN111416515A (en) * | 2020-04-27 | 2020-07-14 | 亚瑞源科技（深圳）有限公司 | Power factor correction circuit with burst setting and method of operating the same |
| CN111416515B (en) * | 2020-04-27 | 2022-11-08 | 亚瑞源科技（深圳）有限公司 | Power factor correction circuit with burst setting and method of operating the same |
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| CN103117654B (en) | 2015-01-07 |
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