CN101262133A - PWM switching control method and device for three-level PFC circuit - Google Patents
PWM switching control method and device for three-level PFC circuit Download PDFInfo
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- CN101262133A CN101262133A CNA2007100800007A CN200710080000A CN101262133A CN 101262133 A CN101262133 A CN 101262133A CN A2007100800007 A CNA2007100800007 A CN A2007100800007A CN 200710080000 A CN200710080000 A CN 200710080000A CN 101262133 A CN101262133 A CN 101262133A
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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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 discloses a PWM switching control method of a three-level PFC circuit, which comprises the following steps: and judging the load level, and selecting a PWM wave-transmitting mode according to the load level. When the load belongs to light load, the PWM wave-sending mode adopts a first wave-sending mode; and when the load is heavy, the PWM wave transmitting mode adopts a second wave transmitting mode. Different wave-sending modes are adopted according to the load grade, so that the problem that the current drop generates distortion during heavy load and the problem that the reliability of a power device is greatly influenced by inductance ripple current during light load are solved.
Description
Technical field
The present invention relates to power or the circuit arrangement or the system field of distribution, relate in particular to a kind of three-level PFC circuit PWM method for handover control and device.
Background technology
Existing three-level PFC (Power Factor Correction: the capability correction factor) in the control of circuit, (Pulse Width Modulation: it is such to PWM commonly used pulse-width modulation) sending out the ripple mode: judge the positive and negative of alternating voltage, positive half cycle at alternating voltage, output with a positive triangular wave and electric current loop is compared, and obtains PWM; At the negative half period of alternating voltage, with a negative triangular wave, promptly be equivalent to triangular wave has been moved 180 degree phase places, compare with the output of electric current loop, obtain PWM.Adopt vector to send out the oscillogram of ripple, i as shown in Figure 2
u *, i
v *And i
w *Be respectively the output of three-phase current ring, in some moment, three-phase alternating voltage is respectively: the U phase voltage is being for just, and the V phase voltage is for negative, and the W phase voltage is being for just, then i
u *And i
w *All relatively obtain PWM, i with a positive triangular wave respectively
v *Then relatively obtain PWM with a negative triangular wave.The PWM that obtains like this is consistent with vector control theory, and we are called " vector is sent out ripple ".Vector is sent out ripple lot of advantages such as the inductive current ripple is little, so often adopted.
But above-mentioned vector is sent out the ripple mode will switch triangular wave at the alternating voltage zero-crossing point, and triangular wave is moved 180 degree phase places, when triangular wave switches, will produce a duty ratio greater than switch periods.The cycle of this big space rate is 1.5 times a switch periods, has moved 180 degree phase angles with regard to the pwm signal that makes this phase like this.After the big space rate, the duty ratio size of this phase is constant, but is equivalent to move 180 degree phase angles.
If electric current should be can be not problematic also fully at zero crossing at this moment.But we often are difficult to accomplish that electric current overlaps when underload (particularly) fully with the phase place of voltage, so work as voltage zero-cross, when switching triangular wave, if electric current is not in zero crossing, then can cause electric current to have one to fall, and distort.Under the heavy duty, the loop of PFC is fast, can very fast adjusting come, so the distortion of electric current is not obvious; But under underload, loop is slow, and then distortion is very obvious.Current distortion all can take place in the voltage over zero of any phase, has influence on other phase simultaneously, and three-phase current is all distorted, the harmonic content height.Through above-mentioned analysis, if alternating voltage is not accomplished to overlap fully with the phase place of electric current, then work as voltage zero-cross, when switching triangular wave, electric current is not in zero crossing fully, can cause electric current to have one to fall, and distorts.This is a kind of intrinsic problem that vector is sent out ripple.
Another kind of send out the ripple mode, no matter alternating voltage all uses positive triangular wave to compare at positive half cycle or negative half period, no matter promptly alternating voltage positive and negative, triangular wave does not carry out any phase shift, is referred to as simply to send out ripple here.Adopt the simple ripple of sending out, do not have 180 phase shifts of spending again at zero crossing PWM, current waveform is also just undistorted under the underloading.The oscillogram of ripple is simply sent out in employing shown in Figure 3.This simple ripple mode solved the problems referred to above that vector is sent out the ripple mode, but the inductance ripple current that this simple ripple modulated out is very big.Inductive current mean value is big under the heavy duty situation, and it is big to add ripple, and then the maximum current of inductance is very big, and this electric current flows through power device, causes the current stress of power device to exceed standard, and influences reliability.
Summary of the invention
The object of the invention is to provide a kind of three-level PFC circuit PWM method for handover control and device, and solution employing vector when heavy duty is sent out ripple and caused current distortion obvious, and adopts the simple ripple of sending out to cause the bigger problem of inductance ripple current when underload.
The present invention proposes a kind of three-level PFC circuit PWM method for handover control, comprises step:
(1) judges load level;
(2) select PWM to send out the ripple mode according to load level.
Preferably, above-mentioned load level is to determine according to the percentage that bearing power accounts for rated power.
Preferably, above-mentioned load level is to determine according to the size of input current or output current.
Wherein, load level comprises underload and heavy duty.
When above-mentioned load level was underload, PWM sent out the ripple mode and adopts first ripple mode; When described load level was heavy duty, PWM sent out the ripple mode and adopts second ripple mode.
Above-mentioned first ripple mode is do not judge three-phase alternating voltage positive and negative, adopts positive triangular wave and the three-phase current ring output simple ripple mode of sending out relatively.
Above-mentioned second ripple mode is to be that timing adopts the output of positive triangular wave and three-phase current ring relatively, adopt negative triangular wave and the vector that the output of three-phase current ring is compared to send out the ripple mode at three-phase alternating voltage when negative at three-phase alternating voltage.
The present invention also proposes a kind of three-level PFC circuit PWM switching control, comprises the load sensor that detects load level.
Preferably, above-mentioned load sensor detects the voltage and current of load output or three-phase electricity input, computational load power.
Above-mentioned load sensor obtains the switching logic control signal according to the ratio of bearing power and rated power, and the control switch controller selects to send out the ripple mode.
Three-level PFC circuit PWM method for handover control provided by the invention and device, adopted the different ripple modes of sending out according to load level, inductance ripple current considerable influence power device reliability problems had obtained solution when the electric current when making heavy duty fell the problem that produces distortion and underload.
Description of drawings
Fig. 1 is the principle schematic of pfc circuit PWM switching control one embodiment of the present invention;
Fig. 2 adopts vector to send out the oscillogram of ripple mode;
Fig. 3 adopts the simple oscillogram of sending out the ripple mode;
Fig. 4 is the three-level PFC circuit schematic diagram;
Fig. 5 is a three-level PFC distortion circuit diagram.
The object of the invention, function and advantage will be in conjunction with the embodiments, are described further with reference to accompanying drawing.
Embodiment
Show the principle schematic of a kind of three-level PFC circuit PWM switching control of first embodiment of the invention proposition as Fig. 1.Three-level PFC circuit PWM switching control comprises high frequency triangle wave generator 11, U phase current ring arithmetic unit 12, comparator 13, on-off controller 14, inverter 15, high frequency triangle wave generator 21, V phase current ring arithmetic unit 22, comparator 23, on-off controller 24, inverter 25, high frequency triangle wave generator 31, W phase current ring arithmetic unit 32, comparator 33, on-off controller 34, inverter 35, pfc circuit 1, load 2 and load sensor 3.
The voltage and current of load sensor 3 sensing lead outputs, computational load power, rated power with bearing power and pfc circuit 1 compares, if bearing power is a underload less than 30% rated power, if bearing power is a heavy duty more than or equal to 30% rated power.
When detecting, load sensor 3 exports switching logic control signal " 0 " when load is underload respectively to on-off controller 14, on-off controller 24 and on-off controller 34, on-off controller 14, on-off controller 24 and on-off controller 34 adopt the simple ripple mode of sending out according to switching logic control signal " 0 ", export positive triangular wave respectively to comparator 13, comparator 23 and comparator 33, comparator 13, comparator 23 and comparator 33 are respectively according to i
u *, i
v *And i
w *Obtain U phase, V phase and W switch controlling signal S11, S22 and S33 mutually, export pfc circuit 1 to.
When load sensor 3 detects bearing power more than or equal to 30% rated power, be judged as heavy duty, load sensor 3 output switching logic control signals " 1 " are to on-off controller 14, on-off controller 24 and on-off controller 34, on-off controller 14, on-off controller 24 and on-off controller 34 adopt vector to send out the ripple mode, detect U phase voltage, W phase voltage and V phase voltage positive and negative of pfc circuit 1 respectively, when on-off controller 14 detects the U phase voltage is timing, export positive triangular wave to comparator 13, comparator 13 is used i
u *With positive triangular wave relatively obtain U mutually switch controlling signal S11 transfer to pfc circuit 1.When on-off controller 24 detects the V phase voltage when negative, the negative triangular wave of output is to comparator 23, and comparator 23 is used i
v *With negative triangular wave relatively obtain V mutually switch controlling signal S22 transfer to pfc circuit 1.When on-off controller 34 detects the W phase voltage is timing, exports positive triangular wave to comparator 33, and comparator 33 is used i
w *With positive triangular wave relatively obtain U mutually switch controlling signal S33 transfer to pfc circuit 1.
In a preferred embodiment, pfc circuit 1 can adopt three-level PFC circuit shown in Figure 4 or three-level PFC distortion circuit shown in Figure 5.Switch controlling signal S11, S22 and S33 be opening and turn-offing by the S1 among Fig. 4 and Fig. 5, S2 and S3 node control switching tube respectively.
(scheme not shown) in an alternative embodiment of the invention, the input of load sensor 3 is connected the input of the three-phase electricity of pfc circuit 1, and remaining circuit is identical with first embodiment of the invention.Load sensor 3 detects pfc circuit 1 three-phase electricity input terminal voltage and electric current, calculate bearing power according to three-phase electricity input terminal voltage and galvanometer, rated power with bearing power and pfc circuit 1 compares, if bearing power is a underload less than 30% rated power, if bearing power is a heavy duty more than or equal to 30% rated power.
Load level judgment mode of the present invention is not limited to judge and can also judge by electric current by power that the criterion of load level also is not limited to 30% a kind of rated power, can carry out percentage according to concrete circuit and set.The source of load detection signal is not limited to the output of load and the input of three-phase electricity, can also be other multiple sources, such as the input of load or the output of three-phase electricity.Same load level is not limited to above-mentioned two kinds of underloads and heavy duty, can also two or more load level be set according to physical circuit, sends out the ripple mode and also is not limited to above-mentioned two kinds, can set according to the kind of load level.Above-mentioned many modifications and variations are possible, and these modifications and variations that will be readily apparent to persons skilled in the art still belong in the scope of patent protection of the present invention.
Claims (10)
1. three-level PFC circuit PWM method for handover control comprises step:
(1) judges load level;
(2) select PWM to send out the ripple mode according to load level.
2. pfc circuit PWM method for handover control as claimed in claim 1 is characterized in that: described load level is to determine according to the percentage that bearing power accounts for rated power.
3. pfc circuit PWM method for handover control as claimed in claim 1 is characterized in that: described load level is to determine according to the size of input current or output current.
4. as the described pfc circuit PWM of the arbitrary claim of claim 1 to 3 method for handover control, it is characterized in that: described load level comprises underload and heavy duty.
5. pfc circuit PWM method for handover control as claimed in claim 4 is characterized in that: when described load level was underload, PWM sent out the ripple mode and adopts first ripple mode; When described load level was heavy duty, PWM sent out the ripple mode and adopts second ripple mode.
6. pfc circuit PWM method for handover control as claimed in claim 5 is characterized in that: described first ripple mode is do not judge three-phase alternating voltage positive and negative, adopts positive triangular wave and the three-phase current ring output simple ripple mode of sending out relatively.
7. pfc circuit PWM method for handover control as claimed in claim 5 is characterized in that: described second ripple mode is to be that timing adopts the output of positive triangular wave and three-phase current ring relatively, adopt negative triangular wave and the vector that the output of three-phase current ring is compared to send out the ripple mode at three-phase alternating voltage when negative at three-phase alternating voltage.
8. a three-level PFC circuit PWM switching control is characterized in that: comprise the load sensor that detects load level.
9. three-level PFC circuit PWM switching control as claimed in claim 8 is characterized in that: described load sensor detects the voltage and current of load output or three-phase electricity input, computational load power.
10. three-level PFC circuit PWM switching control as claimed in claim 8 or 9, it is characterized in that: described load sensor obtains the switching logic control signal according to the ratio of bearing power and rated power, and the control switch controller selects to send out a ripple mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2007100800007A CN101262133B (en) | 2007-03-06 | 2007-03-06 | PWM switching control method and device for three-level PFC circuit |
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|---|---|---|---|
| CN2007100800007A CN101262133B (en) | 2007-03-06 | 2007-03-06 | PWM switching control method and device for three-level PFC circuit |
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| CN101262133A true CN101262133A (en) | 2008-09-10 |
| CN101262133B CN101262133B (en) | 2011-03-23 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101741261B (en) * | 2009-09-29 | 2012-05-23 | 杭州士兰微电子股份有限公司 | Control system and control method for frequency interpolation pattern cascading off-line PFC-PWM switch power converter |
| CN102957190A (en) * | 2012-11-08 | 2013-03-06 | 联正电子(深圳)有限公司 | Square wave UPS (uninterrupted power supply) mode switching control method and square wave UPS |
| CN103607104A (en) * | 2013-11-22 | 2014-02-26 | 乐金电子研发中心(上海)有限公司 | Sine wave modulation circuit and sine wave modulation method |
| CN104184348A (en) * | 2013-05-22 | 2014-12-03 | 全汉企业股份有限公司 | Power supply system capable of maintaining high conversion efficiency for different loads |
| CN112713791A (en) * | 2020-11-25 | 2021-04-27 | 杭州中恒电气股份有限公司 | Vienna rectifier processing method and device, electronic equipment and medium |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100337171C (en) * | 2002-05-16 | 2007-09-12 | 广达电脑股份有限公司 | Double frequency pulse wave width modulating and voltage stabilizer |
| CN1300924C (en) * | 2002-08-15 | 2007-02-14 | 台达电子工业股份有限公司 | Intermittent controlled synchronous rectifying device and its control method |
-
2007
- 2007-03-06 CN CN2007100800007A patent/CN101262133B/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101741261B (en) * | 2009-09-29 | 2012-05-23 | 杭州士兰微电子股份有限公司 | Control system and control method for frequency interpolation pattern cascading off-line PFC-PWM switch power converter |
| CN102957190A (en) * | 2012-11-08 | 2013-03-06 | 联正电子(深圳)有限公司 | Square wave UPS (uninterrupted power supply) mode switching control method and square wave UPS |
| CN102957190B (en) * | 2012-11-08 | 2014-12-10 | 联正电子(深圳)有限公司 | Square wave UPS (uninterrupted power supply) mode switching control method and square wave UPS |
| CN104184348A (en) * | 2013-05-22 | 2014-12-03 | 全汉企业股份有限公司 | Power supply system capable of maintaining high conversion efficiency for different loads |
| CN104184348B (en) * | 2013-05-22 | 2017-04-12 | 全汉企业股份有限公司 | Power supply system |
| CN103607104A (en) * | 2013-11-22 | 2014-02-26 | 乐金电子研发中心(上海)有限公司 | Sine wave modulation circuit and sine wave modulation method |
| CN112713791A (en) * | 2020-11-25 | 2021-04-27 | 杭州中恒电气股份有限公司 | Vienna rectifier processing method and device, electronic equipment and medium |
| CN112713791B (en) * | 2020-11-25 | 2022-05-20 | 杭州中恒电气股份有限公司 | Vienna rectifier processing method and device, electronic equipment and medium |
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| CN101262133B (en) | 2011-03-23 |
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Address after: No. 1510, Kansas Avenue, lureen, Ohio, USA Patentee after: Walteff energy systems company Address before: The United States of Ohio city F Lorain Street No. 1122 Patentee before: Emerson Network Power Co., Ltd. |
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