CN102594135B - Boost PFC controller - Google Patents
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- CN102594135B CN102594135B CN2012100489894A CN201210048989A CN102594135B CN 102594135 B CN102594135 B CN 102594135B CN 2012100489894 A CN2012100489894 A CN 2012100489894A CN 201210048989 A CN201210048989 A CN 201210048989A CN 102594135 B CN102594135 B CN 102594135B
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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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- 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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Abstract
According to a boost PFC controller of the present invention, through turning on a signal generation circuit and turning off the signal generation circuit, turn-on and turn-off of a power switch tube are controlled, the PFC controller can control switch frequency of the power switch tube without an internal clock signal, and constant frequency working or variable frequency working can be realized according to an actual need. Design difficulty of an EMI filter is reduced. Further, according to the invention, through an input voltage feedforward circuit, that an output voltage feedback variable is related to input power and is not related to input voltage is realized, and a global electrical network voltage input design requirement is facilitated.
Description
Technical field
The present invention relates to the power factor correction field, in particular, relate to a kind of boost PFC controller.
Background technology
Harmonic pollution electrical network caused in order to reduce power electronic equipment, add power factor correction (PFC) circuit at its input side usually.The normal APFC that adopts is transformed to the input current of power electronic equipment and the synchronous sine wave of input voltage at present, to improve the power factor of power electronic equipment, thereby the minimizing harmonic pollution, active PFC circuit often adopts the boost PFC circuit topological structure at present.In the high-power applications occasion, the boost PFC circuit of continuous conduction mode (CCM) has more attraction, being set forth typical CCM boost PFC circuit below with reference to Fig. 1.
With reference to figure 1, be depicted as typical CCM boost PFC circuit diagram, it comprises a power stage circuit and control circuit.Described power stage circuit comprises inductance L, power switch tube S
m, diode D, input capacitance C
inwith output capacitance C
out, it forms a booster type circuit topological structure.Described control circuit adopts the average current control mode of electric current loop and Voltage loop.The inductive current sample circuit detects inductive current, goes forward side by side with to handle averagely, obtains characterizing the sampled voltage signal V of inductive current mean value
sen, this sampled voltage signal V
senbe transferred to the inverting input of error amplifier W1, the in-phase input end of error amplifier W1 receives the reference signal V of multiplier output
r, two inputs of multiplier receive respectively output voltage feedback variable V
cwith the input voltage V after rectification
g.The sampled voltage signal V of error amplifier W1 to receiving
senwith reference signal V
rafter comparing and amplifying processing, produce an error signal V
e.Pwm control circuit is by described error signal V
ecompare with a sawtooth signal, produce power ratio control switching tube S
mthe signal of turn-on and turn-off, follow input voltage waveform with the waveform of adjusting input current and change, and then reach the purpose of power factor correction.
In the pwm control circuit of this traditional CCM boost PFC circuit, need a built-in oscillator, to produce the sawtooth signal of fixed clock frequency, so power switch tube S
mconstant switching frequency is determined by built-in clock signal; In order to facilitate EMI test, general clock generating circuit need to adopt trembles design frequently to isolate the noise in wide frequency ranges more.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of novel boost PFC controller, described pfc controller can be controlled the switching frequency of described power switch pipe without internal clock signal, can realize according to actual needs constant frequency work or variable frequency work.
According to a kind of boost PFC controller of one embodiment of the invention, be applied to an AC/DC converter, comprising: cut-off signals circuit for generating, Continuity signal circuit for generating and logic control circuit; Wherein,
Described Continuity signal circuit for generating receives the first sampled signal of a sign inductive current, and described the first sampled signal and one first reference voltage are compared, in described AC/DC converter in the turn-off time of power switch pipe, described the first sampled signal continuous decrease, when described the first sampled signal drops to described the first reference voltage, produce Continuity signal;
Described cut-off signals circuit for generating compares described the first sampled signal and the second reference voltage, in the ON time of described power switch pipe, described the first sampled signal continues to rise, and when described the first sampled signal rises to described the second reference voltage, produces cut-off signals;
The difference that wherein said the first reference voltage is the first control signal and the second control signal, described the second reference signal be described the first control signal and the second control signal and value; Described the first control signal is the DC input voitage after rectification and the control of output voltage feedback variable by described AC/DC converter; The proportional routine relation of the duty ratio of described the second control signal and described power switch pipe and the product of described DC input voitage, proportionality coefficient is the first proportionality coefficient;
Described logic control circuit is connected with described cut-off signals circuit for generating with described Continuity signal circuit for generating respectively, when described Continuity signal is effective, controls described power switch pipe conducting; When described cut-off signals is effective, controls described power switch pipe and turn-off.
Preferably, described the first proportionality coefficient is constant, constant with the switch periods that guarantees described power switch pipe.
Preferably, described the first proportionality coefficient is adjustable, so that the switch periods of described power switch pipe changes.
Further, comprise the output voltage feedback loop, it receives the output voltage of described AC/DC converter, to obtain described output voltage feedback variable, described output voltage feedback variable is controlled described the first control signal, thereby guarantees that described output voltage remains constant.
Further, comprise the inductive current sample circuit, cross the electric current of inductance in described AC/DC converter in order to sample streams, and produce described the first sampled signal.
Further, comprise the power feedforward circuit, it receives the DC input voitage after rectification, and carries out the peak value detection, to produce peak voltage signal; After described DC input voitage and described output voltage feedback variable multiply each other, the ratio of itself and described peak voltage signal square is as described the first control signal, with the proportional routine relation of the input power that guarantees described output voltage feedback variable and described AC/DC converter.
Further, comprise the second control signal circuit for generating, described the second control signal circuit for generating comprises an averaging circuit, it receives respectively Continuity signal and the cut-off signals of the first voltage source, described power switch pipe, to produce described the second control signal, the ratio of wherein said the first voltage source and described DC input voitage is described the first proportionality coefficient.
Preferably, described logic control circuit comprises a rest-set flip-flop, the reset terminal of described rest-set flip-flop is connected with described Continuity signal circuit for generating, and the set end is connected with described cut-off signals circuit for generating, and the switch controlling signal of output output is in order to control the switch motion of described power switch pipe.
According to a kind of boost PFC controller of the present invention, can realize that without the onboard clock signal power switch pipe surely frequently works or tremble work frequently by inner control circuit, reduced the design difficulty of electromagnetic interface filter.In addition, the present invention realizes that by the input voltage feed forward circuit output voltage feedback variable is relevant to input power and irrelevant with input voltage, is conducive to the requirement of global line voltage In-put design.
The accompanying drawing explanation
Figure 1 shows that existing CCM boost PFC circuit diagram;
Figure 2 shows that the theory diagram according to the first embodiment of a kind of boost PFC controller of the present invention;
Figure 3 shows that the theory diagram according to the second embodiment of a kind of boost PFC controller of the present invention;
Figure 4 shows that pfc controller shown in Fig. 3 working waveform figure;
Figure 5 shows that the theory diagram according to the 3rd embodiment of a kind of boost PFC controller of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail, but the present invention is not restricted to these embodiment.The present invention contain any on marrow of the present invention and scope, make substitute, modification, equivalent method and scheme.In order to make the public have thoroughly and understand the present invention, describe concrete details in detail in the following preferred embodiment of the present invention, and do not have for a person skilled in the art the description of these details also can understand the present invention fully.
A kind of boost PFC controller described in the present invention is applied in the AC/DC converter, described AC/DC converter also comprises a power stage circuit, it is described in background technology, and each element in the power stage circuit in following each embodiment is with all identical in background technology.
With reference to figure 2, be depicted as the theory diagram according to the first embodiment of a kind of boost PFC controller of the present invention, described boost PFC controller comprises Continuity signal circuit for generating 201, cut-off signals circuit for generating 202 and logic control circuit 203; Described power switch tube S
ma switch periods comprise ON time T
oNwith turn-off time T
oFF; Wherein,
Described Continuity signal circuit for generating 201 receives one and characterizes inductive current I
lthe first sampled signal, and described the first sampled signal and one first reference voltage are compared to power switch tube S in described AC/DC converter
mturn-off time in, described the first sampled signal continuous decrease, when described the first sampled signal drops to described the first reference voltage, produce Continuity signal ON;
Described cut-off signals circuit for generating 202 compares described the first sampled signal and the second reference voltage, in described power switch tube S
moN time in, described the first sampled signal continue to rise, and when described the first sampled signal rises to described the second reference voltage, produces cut-off signals OFF;
The difference that wherein said the first reference voltage is the first control signal and the second control signal, described the second reference signal be described the first control signal and the second control signal and value; Described the first control signal is by the DC input voitage V of described AC/DC converter after rectification
gand output voltage feedback variable V
ccontrol; Described the second control signal and described power switch tube S
mduty ratio D and described DC input voitage V
gthe proportional routine relation of product, proportionality coefficient is the first Proportional coefficient K
1;
Described logic control circuit 203 is connected with described cut-off signals circuit for generating 202 with described Continuity signal circuit for generating 201 respectively, when described Continuity signal ON is effective, controls described power switch tube S
mconducting; When described cut-off signals OFF is effective, control described power switch tube S
mturn-off.
As can be seen from the above, described Continuity signal circuit for generating is mainly used in the shutoff duration of power ratio control switching tube, described cut-off signals circuit for generating is mainly used in the conduction duration of power ratio control switching tube, and, in this process, if described the first proportionality coefficient is constant, the switch periods of described power switch pipe remains constant; If described the first proportionality coefficient is adjustable, the switch periods of described power switch pipe changes.
Can find out from the embodiment shown in Fig. 2, adopt according to boost PFC controller of the present invention, by inner control circuit, without the onboard clock signal, can realize that power switch pipe surely frequently works or tremble work frequently, reduce the design difficulty of electromagnetic interface filter.
With reference to figure 3, be depicted as the theory diagram according to the second embodiment of a kind of boost PFC controller of the present invention.On basis embodiment illustrated in fig. 2, the present embodiment has specifically described a kind of implementation method of Continuity signal circuit for generating 201, cut-off signals circuit for generating 202 and logic control circuit 203, and further comprises output voltage feedback loop 301, inductive current sample circuit 302 and the second control signal circuit for generating 303.
Described output voltage feedback loop 301 receives the output voltage V of described AC/DC converter
out, to obtain described output voltage feedback variable V
c, described DC input voitage V
gwith output voltage feedback variable V
ccarry out product calculation, its output signal is as described the first control signal V
ctr1, i.e. V
ctr1=V
gv
c; Described output voltage feedback variable V
ccontrol described the first control signal V
ctr1thereby, guarantee described output voltage V
outremain constant.
Described inductive current sample circuit 302 is crossed the electric current I of inductance in described AC/DC converter in order to sample streams
l, and produce described the first sampled signal V
sen; In concrete application, described inductive current sample circuit 302 can average processing to the current signal of sampling by sampling resistor, to form the first sampled signal V that characterizes inductive current mean value
sen;
Described the second control signal circuit for generating 303 comprises an averaging circuit, and it receives respectively the first voltage source V
s1, described power switch pipe Continuity signal and cut-off signals, to produce described the second control signal V
ctr2, wherein said the first voltage source V
s1with described DC input voitage V
gratio be described the first Proportional coefficient K
1, i.e. V
s1=K
1* V
g.In the present embodiment, described averaging circuit comprises the first switch S be connected in series
1with second switch S
2, and by the first resistance R
1with the first capacitor C
1the RC filter circuit formed; Wherein,
Described the first switch S
1first end receive described the first voltage source V
s1, described second switch S
2the second end ground connection; Described the first resistance R
1an end be connected to described the first switch S
1with second switch S
2points of common connection, the other end and described the first capacitor C
1ground connection after series connection.Wherein, described the first switch S
1on off state and described power switch tube S
mon off state identical, described second switch S
2on off state and described power switch tube S
mon off state contrary.Described the first capacitor C
1on voltage as described the second control signal V
ctr2.Described the first voltage source V
s1through described the first switch S
1with second switch S
2average processing through the RC filter circuit again after copped wave, obtain described the second control signal V
ctr2, described the second control signal V
ctr2by following formula, determined:
Described Continuity signal circuit for generating comprises comparator 304, and its inverting input receives described the first sampled signal V
sen, its in-phase input end receives the first reference voltage V
ref1, to export described Continuity signal ON, wherein said the first reference voltage V
ref1for described the first control signal V
ctr1with the second control signal V
ctr2difference, i.e. V
ref1=V
ctr1-V
ctr2.
Described cut-off signals circuit for generating comprises comparator 305, and its in-phase input end receives described the first sampled signal V
sen, its inverting input receives the second reference voltage V
ref2, to export described cut-off signals OFF, wherein said the second reference voltage V
ref2for described the first control signal V
ctr1with the second control signal V
ctr2and value, i.e. V
ref2=V
ctr1+ V
ctr2.
Described logic control circuit comprises rest-set flip-flop 306, its reset terminal R end is connected with described Continuity signal circuit for generating, receives described Continuity signal ON, and its set end S end is connected with described cut-off signals circuit for generating, receive described cut-off signals OFF, its reversed-phase output
end and described power switch tube S
mcontrol end connect, its output signal is in order to control described power switch tube S
mswitch motion.
Function and the course of work and the operation principle of the working waveform figure shown in Fig. 4 to describe described pfc controller in detail below in conjunction with each circuit in this embodiment:
As seen from Figure 4, when described power switch tube S
mwhen off state, described the first sampled signal V
sencontinuous decrease, as described the first sampled signal V
sendrop to described the first reference voltage V
ref1the time, described comparator 304 produces Continuity signal ON, and described rest-set flip-flop 308 receives described Continuity signal ON and carries out homing action, its
end output high level is controlled described power switch tube S
mconducting;
When described power switch tube S
mwhen conducting state, described the first sampled signal V
sencontinue to rise, as described the first sampled signal V
senrise to described the second reference voltage V
ref2the time, the described cut-off signals OFF of described comparator 305 output.Described rest-set flip-flop 306 receives described cut-off signals OFF and carries out the set action, its
the end output low level is controlled described power switch tube S
mturn-off.
Because switching frequency is higher, therefore the difference of described the second reference voltage and described the first reference voltage is approximately described power switch tube S
mduring conducting, the rising value of described inductive current sampled signal:
Wherein, R
sfor the equivalent resistance of sampling resistor in inductive current sample circuit 302, bring formula (1) into formula (2) and obtain described power switch tube S
mswitch periods T
sexpression formula be:
Can obtain such inference by formula (3), described power switch tube S
mswitch periods T
swhen the equivalent resistance of main circuit inductance and sampling resistor is definite value, only with described the first Proportional coefficient K
1relevant, can be by regulating described the first Proportional coefficient K
1value be constant or change, constant or change with the switch periods that guarantees described power switch pipe.
Below discuss according to the process that realizes power factor correction in embodiments of the invention: described the first sampled signal V
senmean value can be expressed as the mean value of described the first reference voltage and the second reference voltage, that is:
Described the first sampled signal V
sencan also be expressed as I
l* R
s, I
lfor inductive current, by V
sen=I
l* R
sand V
ctr1=V
g* V
cbring formula (4) into and obtain described inductive current I
lbe shown below:
When the boost PFC circuit working is the CCM pattern, its input impedance Z
infor
formula (5) is brought into and can be released:
Because output voltage feedback circuit transient response is slower, therefore, can think output voltage feedback variable V
cremain unchanged in the cycle at an electrical network, can obtain input impedance Z thus
inbe a constant constant, therefore can draw input current and input voltage same waveform, same-phase, thereby completed the process of power factor correction.
It should be noted that; the way of realization that circuit processed and logic control circuit occur according to Continuity signal circuit for generating in embodiments of the invention and cut-off signals is not limited to the circuit structure diagram shown in Fig. 3, can realize that the circuit structure of described power switch pipe being controlled accordingly to function all drops in protection scope of the present invention.
Can obtain the Mean Input Power P of AC/DC converter the described embodiment of Fig. 3 from formula (6)
infor:
From formula (7), can find out, now, although whole PFC control circuit has been realized power factor emendation function, described output voltage feedback variable V
cinput power P with described AC/DC converter
inand described DC input voitage V
grelated.For making described output voltage feedback variable V
conly and input power P
inchange relevantly, and irrelevant with the circuit input voltage, can on basis embodiment illustrated in fig. 3, add a power feedforward circuit, its theory diagram as shown in Figure 5.
Described boost PFC controller further comprises the power feedforward circuit, and it receives the DC input voitage V after rectification
g, and carry out the peak value detection, to produce peak voltage signal V
gpk; Described DC input voitage V
gwith described output voltage feedback variable V
cafter multiplying each other, itself and described peak voltage signal V
gpksquare ratio as described the first control signal V
ctr1,
Can derive following relationship thus:
The input impedance Z of described boost PFC circuit working now
infor:
Peak voltage signal V described in formula (9)
gpkunder given line voltage condition, be a constant, described output voltage feedback variable V
cremain unchanged in the cycle at an electrical network, can obtain input impedance Z thus
inbe a constant constant, therefore can draw input current and input voltage same waveform, same-phase, thereby completed the process of power factor correction.
The Mean Input Power that can be obtained circuit by formula (9) is:
(V in formula (10)
g)
2(V
pk)
2ratio under given line voltage condition, be definite value, therefore, the input power of described AC/DC converter and described output voltage feedback variable V
cproportional routine relation, and, it can also be seen that described output voltage feedback variable V from formula (10)
conly and input power P
inchange relevant, irrelevant with input voltage.
To sum up, according to pfc controller of the present invention, without built-in oscillator clocking, get final product the switching frequency of power ratio control switching tube by inner control circuit, also reached the purpose of power factor correction simultaneously.Need to carry out to the AC/DC converter occasion of Electromagnetic Interference Test, thus the switching frequency of wishing power switch pipe one among a small circle in drift the harmonic wave interfering energy is relatively disperseed, realize trembling frequently.Than existing switching frequency shake control technology, can regulate as the case may be the numerical value of the first voltage source and the first current source according to the solution of the present invention, thereby realize easily trembling frequently, thereby reduce the design difficulty of input electromagnetic interface filter, meet the requirement of converter to Electromagnetic Interference Test.In addition, the present invention realizes that by the input voltage feed forward circuit output voltage feedback variable is relevant to input power and irrelevant with input voltage, is conducive to the requirement of global line voltage In-put design.
According to embodiments of the invention as described above, these embodiment do not have all details of detailed descriptionthe, and also not limiting this invention is only described specific embodiment.Obviously, according to above description, can make many modifications and variations.These embodiment are chosen and specifically described to this specification, is in order to explain better principle of the present invention and practical application, thereby under making, the technical field technical staff can utilize the present invention and the modification on basis of the present invention to use well.The present invention only is subject to the restriction of claims and four corner and equivalent.
Claims (8)
1. a boost PFC controller, be applied to an AC/DC converter, it is characterized in that, comprising: cut-off signals circuit for generating, Continuity signal circuit for generating and logic control circuit; Wherein,
Described Continuity signal circuit for generating receives the first sampled signal of a sign inductive current, and described the first sampled signal and one first reference voltage are compared, in described AC/DC converter in the turn-off time of power switch pipe, described the first sampled signal continuous decrease, when described the first sampled signal drops to described the first reference voltage, produce Continuity signal;
Described cut-off signals circuit for generating compares described the first sampled signal and the second reference voltage, in the ON time of described power switch pipe, described the first sampled signal continues to rise, and when described the first sampled signal rises to described the second reference voltage, produces cut-off signals;
The difference that wherein said the first reference voltage is the first control signal and the second control signal, described the second reference voltage be described the first control signal and the second control signal and value; Described the first control signal is the DC input voitage after rectification and the control of output voltage feedback variable by described AC/DC converter; The proportional routine relation of the duty ratio of described the second control signal and described power switch pipe and the product of described DC input voitage, proportionality coefficient is the first proportionality coefficient;
Described logic control circuit is connected with described cut-off signals circuit for generating with described Continuity signal circuit for generating respectively, when described Continuity signal is effective, controls described power switch pipe conducting; When described cut-off signals is effective, controls described power switch pipe and turn-off.
2. boost PFC controller according to claim 1, is characterized in that, described the first proportionality coefficient is constant, constant with the switch periods that guarantees described power switch pipe.
3. boost PFC controller according to claim 1, is characterized in that, described the first proportionality coefficient is adjustable, so that the switch periods of described power switch pipe changes.
4. boost PFC controller according to claim 1, it is characterized in that, further comprise the output voltage feedback loop, it receives the output voltage of described AC/DC converter, to obtain described output voltage feedback variable, described output voltage feedback variable is controlled described the first control signal, thereby guarantees that described output voltage remains constant.
5. boost PFC controller according to claim 1, is characterized in that, further comprises the inductive current sample circuit, crosses the electric current of inductance in described AC/DC converter in order to sample streams, and produce described the first sampled signal.
6. according to boost PFC controller claimed in claim 1, it is characterized in that, further comprise the power feedforward circuit, it receives the DC input voitage after rectification, and carries out the peak value detection, to produce peak voltage signal; After described DC input voitage and described output voltage feedback variable multiply each other, the ratio of itself and described peak voltage signal square is as described the first control signal, with the proportional routine relation of the input power that guarantees described output voltage feedback variable and described AC/DC converter.
7. boost PFC controller according to claim 1, it is characterized in that, further comprise the second control signal circuit for generating, described the second control signal circuit for generating comprises an averaging circuit, it receives respectively Continuity signal and the cut-off signals of the first voltage source, described power switch pipe, to produce described the second control signal, the ratio of wherein said the first voltage source and described DC input voitage is described the first proportionality coefficient.
8. boost PFC controller according to claim 1, it is characterized in that, described logic control circuit comprises a rest-set flip-flop, the reset terminal of described rest-set flip-flop is connected with described Continuity signal circuit for generating, the set end is connected with described cut-off signals circuit for generating, and the switch controlling signal of output output is in order to control the switch motion of described power switch pipe.
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| CN102931838A (en) * | 2012-11-15 | 2013-02-13 | 常州大学 | Slope compensation method for voltage-type hysteresis loop control switching converter and device thereof |
| CN103943086B (en) * | 2014-04-02 | 2016-07-06 | 合肥鑫晟光电科技有限公司 | A kind of analog voltage source circuit and display device |
| US9455636B2 (en) | 2014-12-16 | 2016-09-27 | Stmicroelectronics S.R.L. | Control method and device employing primary side regulation in a quasi-resonant AC/DC flyback converter |
| CN104638723B (en) * | 2015-02-02 | 2017-02-22 | 成都芯源系统有限公司 | Battery charging circuit and method thereof |
| US9621029B2 (en) * | 2015-03-18 | 2017-04-11 | Stmicroelectronics S.R.L. | Method and device for high-power-factor flyback converter |
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| KR100206143B1 (en) * | 1996-08-28 | 1999-07-01 | 윤종용 | A power factor correction circuit |
| KR100303450B1 (en) * | 1998-05-29 | 2001-11-30 | 김덕중 | Pfc controller |
| JP2000139073A (en) * | 1998-11-02 | 2000-05-16 | Matsushita Electric Ind Co Ltd | Switching power supply circuit |
| JP5402268B2 (en) * | 2008-10-16 | 2014-01-29 | 富士電機株式会社 | Interleave control power supply device, control circuit for the power supply device, and control method |
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