CN103117654B - Active power-factor correction circuit and related controller - Google Patents
Active power-factor correction circuit and related controller Download PDFInfo
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- CN103117654B CN103117654B CN201110364956.6A CN201110364956A CN103117654B CN 103117654 B CN103117654 B CN 103117654B CN 201110364956 A CN201110364956 A CN 201110364956A CN 103117654 B CN103117654 B CN 103117654B
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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
- 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
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
Relating power factor correcting circuit of the present invention, espespecially a kind of control circuit being used for active power-factor correction circuit.
Background technology
Due to the problem of energy worsening shortages, people are impelled more and more to pay attention to the power consumption efficiency of electronic installation.Traditional AC to DC converter uses diode rectification to reach mostly, although this kind of framework is simple and cost is low, due to the serious nonlinear distortion of input current, low-frequency harmonics is caused 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 weighing electric power utilization ratio height.The low waste except the energy can be caused meaningless of power factor, a large amount of harmonic waves also can cause the instability of electric power system and the puzzlement of generator, and has a strong impact on the quality of power supply.
Power factor correction (power factor correction, PFC) circuit all can be set in many AC to DC converter to improve power factor.In order to avoid power output changes along with the size of input voltage, the circuit framework that circuit of power factor correction often can adopt input voltage feed forward to control.Such circuit framework needs to utilize squarer (squarer) to calculate the square value of input voltage, and arrange in pairs or groups multiplier and divider are to produce required control signal.
But the complex circuit designs degree of squarer circuit area that is high, that take is large, manufacturing cost is high, often very power consumption again, is thus improving the power consumption efficiency of circuit of power factor correction and reducing further in circuit chip size and cause obstruction.
Summary of the invention
In view of this, how to realize circuit of power factor correction when omitting squarer with the framework of more simplifying, to avoid power output to change along with the size of input voltage, real in there being problem to be solved.
Present description provides a kind of embodiment of active power-factor correction circuit, for correcting the power factor of an AC to DC converter, wherein this AC to DC converter includes an inductance and a power switch, this active power-factor correction circuit includes: a fragment linear gain circuit, when being coupled to this AC to DC converter, 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, produces an error signal for the output voltage according to this AC to DC converter; One PWM controller, when being coupled to this AC to DC converter, 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, for producing the pulse-width modulation signal in order to control this power switch according to this control signal.
This specification separately provides a kind of embodiment of the controller for active power-factor correction circuit, for controlling a pulse-width modulation signal generator of this active power-factor correction circuit, this controller includes: a fragment linear gain circuit, when this active power-factor correction circuit is coupled to an AC to DC converter, for receiving a feed-forward signal, if and this feed-forward signal is less than a threshold values, then one first gain is applied to produce a gain signal to this feed-forward signal, if and this feed-forward signal is greater than this threshold values, then one second gain is applied to produce this gain signal to this feed-forward signal, wherein this second gain is greater than this first gain, one error amplifier, when being coupled to this AC to DC converter, produces an error signal for the output voltage according to this AC to DC converter, and a PWM controller, when being coupled to this AC to DC converter, 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 power-factor correction circuit and controller utilize piecewise linear gain circuitry to replace traditional squarer, the complexity of circuit framework can be reduced, and significantly reduce required bias generator, therefore effectively can reduce circuit area, and reduce required electrical power consumed and manufacturing cost when operating.
Size due to the gain signal of foregoing segments linear gain circuit output is similar to the square value of feed-forward signal size very much, therefore the gain signal action that error signal exports divided by piecewise linear gain circuitry by PWM controller, the power output of AC to DC converter can be avoided to change along with the size of input voltage.
Accompanying drawing explanation
Fig. 1 is the functional block diagram after an embodiment of the AC to DC converter of the present invention simplifies.
Fig. 2 is the functional block diagram after an embodiment of piecewise linear gain circuitry 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 power-factor correction circuit
122 pulse-width modulation signal generators
124 controllers
130 piecewise linear gain circuitries
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 cooperation correlative type is illustrated the embodiment of the present invention.In these are graphic, identical label represents same or similar assembly or process step.
Some vocabulary is employed to censure specific assembly in the middle of specification and follow-up claim.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 with the difference of title the mode distinguishing assembly, but are used as the benchmark of differentiation with assembly difference functionally." comprising " mentioned in the middle of specification and follow-up claim is in the whole text an open term, therefore should be construed to " comprise but be not limited to ... ".In addition, " couple " word comprise directly any at this and indirectly connect means.Therefore, if describe one first assembly in literary composition to be coupled to one second assembly, then represent this first assembly and directly (comprise through electric connection or the signal such as wireless transmission, optical delivery connected mode) this second assembly can be connected to, or through other assembly or connection means indirectly electrically or signal be connected to this second assembly.
Used herein " and/or " describing mode, comprise the combination in any of cited one of them or multiple project.In addition, unless specialized in this specification, otherwise the term of any odd number lattice comprises the connotation of plural lattice all simultaneously.
Please refer to Fig. 1, its illustrate into one embodiment of the invention AC to DC converter 100 simplify after functional block diagram.AC to DC converter 100 converts VD Vout to for alternating voltage Vac AC power 102 provided, to be supplied to 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 power-factor correction circuit (power factor correction circuit, PFC circuit) 120.
Bridge rectifier 111 is rectified into the input voltage vin of m shape ripple for alternating voltage Vac AC power 102 provided.Low pass filter 112 is coupled to the output of bridge rectifier 111, for carrying out filtering to input voltage vin, to produce the feed-forward signal Sff that size is directly proportional to the mean value of input voltage vin.Inductance 113 and diode 114 are coupled between the output of bridge rectifier 111 and load 104.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 power-factor correction circuit 120.In implementation, power switch 116 can realize with transistor.
When power switch 116 conducting (on), the diode 114 of AC to DC converter 100 is in reverse bias cut-off state, and input current Iin can flow to power switch 116 via inductance 113.Now, input voltage vin can be charged to inductance 113, makes inductive current IL linearly increase gradually, until power switch 116 ends (off).Now, the energy needed for load 104 is supplied by output capacitance 115.
When power switch 116 ends, the polarity of voltage on inductance 113 can be anti-phase, and add that input voltage vin is charged via diode 114 pairs of output capacitances 115.Now, output capacitance 115 is in charged state, and inductive current IL then can decline gradually, until power switch 116 conducting once again.In this stage, output voltage Vout can remain fixing, and its size is the voltage that input voltage vin adds inductance 113.
As shown in Figure 1, active power-factor correction circuit 120 includes pulse-width modulation signal generator 122 and controller (PFC controller) 124.Controller 124 includes piecewise linear gain circuitry (piecewise linear gain circuit) 130, error amplifier 140 and PWM controller (PWM controller) 150.When active power-factor correction circuit 120 is coupled to AC to DC converter 100, the feed-forward signal Sff that piecewise linear gain circuitry 130 exports for receiving low pass filter 112, and produce the gain signal Sg that size is similar to the square value of feed-forward signal Sff.Error amplifier 140 produces error signal Sea for the output voltage Vout according to AC to DC converter 100.Such as, error amplifier 140 can with reference to voltage Vref with and the output voltage Vout feedback voltage with a proportionate relationship compare, and obtained difference value to be amplified to produce error signal Sea.PWM controller 150 is coupled to piecewise linear gain circuitry 130 and error amplifier 140, for producing control signal Scom according to gain signal Sg, error signal Sea and input voltage vin, and make the size of control signal Scom be proportional to the size of error signal Sea and input voltage vin, and be inversely proportional to the size of gain signal Sg.In implementation, PWM controller 150 can be multiplier-divider (multiplier-divider), in order to the gain signal Sg that the error signal Sea exported by error amplifier 140 exports divided by piecewise linear gain circuitry 130, and obtained numerical value is multiplied by again the size of the input voltage vin after rectification, to produce control signal Scom.Or, other circuit framework also can be utilized to realize the function of PWM controller 150.Pulse-width modulation signal generator 122 can produce pulse-width modulation signal PWM to control the switching action of power switch 116 according to control signal Scom.
In the present embodiment, when feed-forward signal Sff is less than threshold values Vth, piecewise linear gain circuitry 130 can apply the first gain to produce gain signal Sg to feed-forward signal Sff, and when feed-forward signal Sff is more than or equal to threshold values Vth, then piecewise linear gain circuitry 130 can apply the second gain to produce gain signal Sg to feed-forward signal Sff, wherein, aforesaid second gain is greater than the first gain.Thus, the size of gain signal Sg and feed-forward signal Sff will be made to present the correlation of polyline shaped, that is present the characteristic of piecewise linear.Below collocation Fig. 2 is further illustrated enforcement and the function mode of piecewise linear gain circuitry 130.
Fig. 2 is the functional block diagram after the piecewise linear gain circuitry 130 of one embodiment of the invention simplifies.As shown in Figure 2, piecewise linear gain circuitry 130 includes comparison circuit 210, transduction circuit (transconductance circuit) 220, amplification module 230, current adjusting module 240 and resistance 250.Transduction circuit 220 for converting feed-forward signal Sff to current signal, to produce the feedforward current Iff be directly proportional to the voltage swing of feed-forward signal Sff.Amplification module 230 is coupled to the output of transduction circuit 220, for electric current I ff is amplified to produce the electric current be 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, for drawing electric current.When operating, feed-forward signal Sff and threshold values Vth can compare by comparison circuit 210, and according to the total output current size of result adjustment amplification module 230 compared and the total current amount of drawing of adjustment current adjusting module 240.
In the embodiment of fig. 2, amplification module 230 includes amplifier 232, amplifier 234 and switch 236, and current adjusting module 240 then includes electric current groove (current sink) 242, electric current groove 244 and switch 246.The current i 1 that amplifier 232 is directly proportional to the voltage swing of feed-forward signal Sff with generation for amplified current Iff.The current i 2 that amplifier 234 is directly proportional to the voltage swing of feed-forward signal Sff with generation for amplified current Iff.Electric current groove 242 is coupled to the output of amplifier 232, for drawing the first scheduled current amount i3.Electric current groove 244 is for drawing the second scheduled current amount i4.Switch 236 is coupled between the output of amplifier 234 and electric current groove 242, current i 2 can be coupled to the input of electric current groove 242 when closed.Switch 246 is coupled between the output of amplifier 232 and electric current groove 244, current i 1 can be coupled to the input of electric current groove 244 when closed.
In the present embodiment, when feed-forward signal Sff is less than threshold values Vth, switch 236 can be arranged to not on-state by comparison circuit 210, total output current of amplification module 230 is made to become i1, and switch 246 is also arranged to not on-state, make the total current amount of drawing of current adjusting module 240 become i3.When feed-forward signal Sff is more than or equal to threshold values Vth, switch 236 can be arranged to conducting state by comparison circuit 210, make total output current of amplification module 230 become i1+i2, and switch 246 is also arranged to conducting state, makes the total current amount of drawing of current adjusting module 240 become i3+i4.
Thus, when feed-forward signal Sff is less than threshold values Vth, the size of the output current i5 of piecewise linear gain circuitry 130 can equal i1-i3.Now, the magnitude of voltage of the gain signal Sg of piecewise linear gain circuitry 130 output 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.From formula (1), when feed-forward signal Sff is less than threshold values Vth, the size of gain signal Sg and feed-forward signal Sff can linearly positive correlation.
When feed-forward signal Sff is more than or equal to threshold values Vth, the size of the output current i5 of piecewise linear gain circuitry 130 can equal i1+i2-i3-i4.Now, the magnitude of voltage of the gain signal Sg of piecewise linear gain circuitry 130 output can be represented by the formula:
Sg=[(G1+G2) × Vin-(i3+i4)] × R formula (2)
Wherein G2 is the transduction gain of amplifier 234.From formula (2), when feed-forward signal Sff is more than or equal to threshold values Vth, the size of gain signal Sg and feed-forward signal Sff also can linearly positive correlation, but be greater when the yield value of gain signal Sg can be less than threshold values Vth than feed-forward signal Sff.
As can be seen from the explanation of previously described formula (1) and 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 piecewise linear.By the component parameter suitably selected in piecewise linear gain circuitry 130, the result of calculation of approximate squarer just can be produced with piecewise linear gain circuitry 130.
Such as, suppose that the voltage range of feed-forward signal Sff is between 0.8 ~ 2.5V, in one embodiment, the magnitude of current i3 gain G 2 of the gain G 1 of amplifier 232 and amplifier 234 all can be set to 1.1, threshold values Vth is set to 1.65V, drawing electric current groove 242 is set to 0.6 × Iff and the magnitude of current i4 drawn by electric current groove 244 is set to 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 example above, then can, by the mode of the component parameter of suitable adjustment fragment linear gain circuit 130, piecewise linear gain circuitry 130 be made to produce the result of calculation of approximate squarer equally.
Therefore, aforesaid piecewise linear gain circuitry 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 effectively can reduce the circuit area of controller 124, and reduce required electrical power consumed and manufacturing cost when active power-factor correction circuit 120 operates.
As previously mentioned, the gain signal Sg that the error signal Sea that error amplifier 140 can export by the PWM controller 150 in controller 124 exports divided by piecewise linear gain circuitry 130, and obtained numerical value is multiplied by again the size of the input voltage vin after rectification, to produce control signal Scom.In implementation, controller 124 can adopt the magnitude of voltage or electric current I ac with input voltage vin with a proportionate relationship to represent the size of input voltage vin.Pulse-width modulation signal generator 122 can produce corresponding pulse-width modulation signal PWM according to control signal Scom, to control the switching action of power switch 116, makes input current Iin follow control signal Scom and change.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 bring to power factor.
In addition, size due to the gain signal Sg of piecewise linear gain circuitry 130 output is similar to the square value of feed-forward signal Sff size very much, therefore the action of gain signal Sg that error signal Sea exports divided by piecewise linear gain circuitry 130 by PWM controller 150, the power output of AC to DC converter 100 can be avoided equally to change along with the size of input voltage vin.
In the aforementioned embodiment, the scope of the feed-forward signal Sff of input can be divided into two sections and to apply different gains respectively by piecewise linear gain circuitry 130, with the size of the gain signal Sg making generation 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.In implementation, piecewise linear gain circuitry 130 also can set up more comparison circuit, amplifier and switch module, so that the scope of feed-forward signal Sff is divided into more Multi sectional, and apply with different linear gains respectively, make the size of gain signal Sg and feed-forward signal Sff more level off to quadratic relationship.
In another embodiment, piecewise linear gain circuitry 130 also only can arrange the electric current groove that the amplifier of a gain adjustable and adjustable draw size of current.When feed-forward signal Sff is positioned at different scopes, then adopts different amplifier gains and/or make electric current groove draw different current values, to produce required gain signal Sg.
In another embodiment, the feed-forward signal Sff that low pass filter 112 produces is the signal of current forms.Now, the transduction circuit 220 in piecewise linear gain circuitry 130 can be omitted.
In other embodiment, piecewise linear gain circuitry 130 also can adopt one or more transduction circuit, one or more amplifier and/or one or more electric current groove, when making feed-forward signal Sff be positioned at different scopes, the gain signal Sg of different gains can be produced.
The foregoing is only the preferred embodiment of the present invention, all equalizations done according to the present patent application the scope of the claims change and modify, and all should belong to the covering scope of the present invention.
Claims (13)
1. an active power-factor correction circuit, for correcting the power factor of an AC to DC converter, wherein this AC to DC converter includes an inductance and a power switch, and this active power-factor correction circuit includes:
One fragment linear gain circuit, when being coupled to this AC to DC converter, 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, produces an error signal for the output voltage according to this AC to DC converter;
One PWM controller, when being coupled to this AC to DC converter, 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, for producing the pulse-width modulation signal in order to control this power switch according to this control signal;
If wherein this feed-forward signal is less than a threshold values, this piecewise linear gain circuitry can apply one first gain to produce this gain signal to this feed-forward signal, if and this feed-forward signal is greater than this threshold values, then this piecewise linear gain circuitry can apply one second gain to produce this gain signal to this feed-forward signal.
2. active power-factor correction circuit 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 power-factor correction circuit as claimed in claim 2, wherein this feed-forward signal produced according to this input voltage by a low pass filter of this AC to DC converter.
4. active power-factor correction circuit as claimed in claim 1, wherein this second gain is greater than this first gain.
5., for a controller for active power-factor correction circuit, for controlling a pulse-width modulation signal generator of this active power-factor correction circuit, this controller includes:
One fragment linear gain circuit, when this active power-factor correction circuit is coupled to an AC to DC converter, for receiving a feed-forward signal, if and this feed-forward signal is less than a threshold values, then one first gain is applied to produce a gain signal to this feed-forward signal, if and this feed-forward signal is greater than this threshold values, then apply one second gain to produce this gain signal to this feed-forward signal, wherein this second gain is greater than this first gain;
One error amplifier, when being coupled to this AC to DC converter, produces an error signal for the output voltage according to this AC to DC converter; And
One PWM controller, when being coupled to this AC to DC converter, 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.
6. controller as claimed in claim 5, wherein this piecewise linear gain circuitry includes:
One amplification module, for generation of the electric current be directly proportional to the voltage swing of this feed-forward signal;
One current adjusting module, is coupled to the output of this amplification module, for drawing electric current; And
One comparison circuit, is coupled to amplification module and this current adjusting module, for this feed-forward signal and this threshold values being compared, and adjusts total output current size of this amplification module according to the result compared and adjusts the total current amount of drawing of this current adjusting module.
7. controller as claimed in claim 6, wherein this amplification module includes:
One first amplifier, for generation of one first electric current be directly proportional to the voltage swing of this feed-forward signal;
One second amplifier, for generation of one second electric current be directly proportional to the voltage swing of this feed-forward signal; And
One first switch, is coupled between the output of this second amplifier and this current adjusting module, this second electric current can be coupled to the input of this current adjusting module when closed;
Wherein when this feed-forward signal is less than this threshold values, this first switch-linear hybrid can be become not on-state by this comparison circuit, and when this feed-forward signal is greater than this threshold values, this first switch-linear hybrid then can be become conducting state by this comparison circuit.
8. controller as claimed in claim 7, wherein this current adjusting module includes:
One first electric current groove, is coupled to the output of this first amplifier, for drawing one first scheduled current amount;
One second electric current groove, for drawing one second scheduled current amount; And
One second switch, is coupled between the output of this first amplifier and this second electric current groove, this first electric current can be coupled to the input of this second electric current groove when closed;
Wherein when this feed-forward signal is less than this threshold values, this second switch can be arranged to not on-state by this comparison circuit, and when this feed-forward signal is greater than this threshold values, this second switch then can be arranged to conducting state by this comparison circuit.
9. controller as claimed in claim 8, wherein when this first switch conduction, can be coupled to the input of this first electric current groove by this second electric current.
10. controller as claimed in claim 8, wherein this second scheduled current amount is greater than this first scheduled current amount.
11. controllers as claimed in claim 10, wherein the voltage range of this feed-forward signal is between 0.8 ~ 2.5V, the gain of this first amplifier and the gain of this second amplifier are all 1.1, and this threshold values is 1.65V, and this second scheduled current amount is 3 times of this first scheduled current amount.
12. controllers as claimed in claim 6, wherein this piecewise linear gain circuitry separately includes:
One transduction circuit, is coupled to the input of this amplification module, for converting this feed-forward signal to current signal, to produce the feedforward current be directly proportional to the voltage swing of this feed-forward signal.
13. controllers as claimed in claim 12, the wherein total output current size of this amplification module when this feed-forward signal is greater than this threshold values, 2 times when this feed-forward signal is less than this threshold values, and total current the draw amount of this current adjusting module when this feed-forward signal is greater than this threshold values, be 3 times when this feed-forward signal is less than this threshold values.
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| CN201110364956.6A CN103117654B (en) | 2011-11-17 | 2011-11-17 | Active power-factor correction circuit and related controller |
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| CN103117654B true CN103117654B (en) | 2015-01-07 |
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| US10476433B2 (en) * | 2016-07-05 | 2019-11-12 | Delta Electronics, Inc. | Microwave generator with power factor correction function and control method thereof |
| 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 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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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| US7502236B2 (en) * | 2006-10-04 | 2009-03-10 | Power Integrations, Inc. | Power supply controller responsive to a feedforward signal |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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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