CN100568693C - AC-to-DC converter with flyback and forward current harmonic correction - Google Patents
AC-to-DC converter with flyback and forward current harmonic correction Download PDFInfo
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- CN100568693C CN100568693C CNB031246206A CN03124620A CN100568693C CN 100568693 C CN100568693 C CN 100568693C CN B031246206 A CNB031246206 A CN B031246206A CN 03124620 A CN03124620 A CN 03124620A CN 100568693 C CN100568693 C CN 100568693C
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Abstract
The invention relates to a flyback current harmonic correction AC-DC converter, which is electrically coupled with an input filter, a full-bridge rectifier, a booster circuit, an AC-DC converter and a control IC, and a transformer is arranged in the booster circuit and the AC-DC converter, the transformer is provided with a first winding, a second winding and a third winding, the first winding and the second winding are wound on a primary side, the third winding is wound on a secondary side, the first winding belongs to a part of the booster circuit , and the second winding and the third winding belong to a part of the converter; therefore, the power factor correction function and the AC-DC conversion circuit can be combined into a single-stage power converter, the use of magnetic components is reduced, the cost is reduced, the volume is reduced, and the harmonic current standard is met.
Description
Technical field
The present invention relates to exchanging of a kind of flyback current harmonics correction changes direct current transducer, refers to that especially a kind of power factor correcting function and AC/DC circuit of making is combined into a single stage type power supply changeover device.
Background technology
At present, the AC power of high power capacity becomes more and more important on power product, so interchange commentaries on classics direct current transducer needs in raising power factor (PF) and reduction high-frequency harmonic, there are a lot of technical literatures that this theme is discussed, the method of its solution roughly can be divided two classes, the first kind is for using the sinusoid line current and having approaching " 1 " high power factor, but need complicated control loop, shown in the 1st figure.
In addition, second class is that non-sine formula line current uses single-stage single-switch to have simple circuit, though do not have approaching " 1 " high power factor, meet the IEC61000-3-2 code requirement.This class circuit has the common loop of boosting (boost circuit) back level serial connection DC-DC transducer (DC/DC converter) formation single-stage single-switch interchange usually changes direct current transducer, use the power factor correcting function, shown in the 2nd figure, yet, (bulk inductor) is applied in the section that boosts because of large-scale inductance, so class transducer volume and weight are all bigger.
Summary of the invention
Technical problem to be solved by this invention is at above-mentioned defective of the prior art, provide exchanging of a kind of flyback current harmonics correction to change direct current transducer, can make power factor correcting function and AC/DC circuit be combined into a single stage type power supply changeover device, the use of assembly deperms, reduce cost and reduced volume, and can meet the harmonic current standard.
The technical scheme that solution the technology of the present invention problem is adopted is that exchanging of this flyback current harmonics correction changeed direct current transducer, as exchanging the power supply unit that changes direct current, mode with electric property coupling is connected with input filter, full-bridge rectifier, booster circuit, exchanging changes direct current transducer and control integrated circuit IC, and in this booster circuit and interchange commentaries on classics direct current transducer, transformer is set, this transformer has first winding, second winding and the tertiary winding, this first winding and second winding are around primary side, this tertiary winding is around secondary side, and this first winding belongs to the part of booster circuit (BOOST), and this second winding and the tertiary winding belong to the part of transducer; By this, can make power factor correcting function and AC/DC circuit be combined into a single stage type power supply changeover device, the use of the assembly that deperms reduces cost and reduced volume, meets the harmonic current standard.
Description of drawings
The present invention is described in further detail below in conjunction with the embodiment accompanying drawing.
Fig. 1 exchanges the calcspar that changes direct current transducer for commonly using.
Fig. 2 is for commonly using the calcspar that single-stage exchanges changes direct current transducer.
Fig. 3 the present invention's flyback circuit diagram.
Fig. 4 the present invention exchanges the calcspar that changes direct current transducer.
Fig. 5, Fig. 6 are the present invention's initial conduction angle curves schematic diagram.
Fig. 7 the present invention's large-scale capacitance terminal voltage schematic diagram.
The schematic diagram of Fig. 8 inductance selection of the present invention.
Fig. 9, Figure 10, Figure 11, Figure 12 the present invention's experimental result schematic diagram, wherein:
The main harmonic wave numerical value distribution map of Fig. 9 line current
Figure 10 is line current and voltage oscillogram (V
Ac=110v, output=48v/2A
Figure 11 is the dynamic response oscillogram of line voltage, line current, output voltage and output current
Figure 12 is the rated voltage of large-scale capacitor and the graph of a relation of line voltage
Figure 13 the present invention's forward type circuit diagram.
Among the figure: the 1-input filter 2-full-bridge rectifier 3-booster circuit 31-first inductance 311-second inductance 32-first diode 33-second diode 34-switch 35-large-scale capacitor 4-flyback converter 41-the 3rd polar body 42-output capacitance 43-the 4th polar body 5-control integrated circuit IC plate 6-direct current input capacitance 7-load 8-transformer 81-first winding 82-second winding 83-tertiary winding
Embodiment
See also Fig. 3-Figure 13.As shown in the figure: the present invention is that exchanging of a kind of flyback current harmonics correction changeed direct current transducer, be applied in and exchange the power supply unit that changes direct current, can make power factor correcting function and AC/DC circuit be combined into a single stage type power supply changeover device, the use of assembly deperms, reduce cost and reduced volume, meet the harmonic current standard.
Direct current transducer is changeed in the interchange of the above-mentioned flyback current harmonics correction of being carried, and it is connected with input filter 1, one full-bridge rectifier 2, one booster circuit 3 (BOOST), one transducer 4 and a control integrated circuit IC 5 (can adopt Pwm38421c) as the embodiment integrated circuit (IC), this institute forms, and this transducer 4 can be according to the transducer 4 of a flyback that is required to be or forward type, now elder generation is an example with the transducer 4 of flyback, this input filter 1, one full-bridge rectifier 2, one booster circuit 3 (BOOST), one flyback converter 4 and a control IC 5, also collocation has a direct current input capacitance 6 and a load 7, and a transformer 8 is set in this booster circuit 3 and flyback converter 4, this transformer 8 has first winding 81, second winding 82 and the tertiary winding 83, this first winding 81 and second winding 82 are around primary side, this tertiary winding 83 is around secondary side, and this first winding 81 belongs to the part of booster circuit 3 (BOOST), and this second winding 82 and the tertiary winding 83 belong to the part of flyback converter 4, and this booster circuit 3 (BOOST) connects first inductance 31 and first diode 32 by one first winding 81, second diode 33, switch 34 (MOSFET) and large-scale capacitor 35 are formed, and this first inductance 31 is the soft handover inductance, and to first diode, one second diode tool soft handover function, when the linearity of electric current reduces to zero, electric current via first inductance 31 and second diode 33 is closed, and have the effect of zero switch cost, the turn ratio n of first winding 81 and second winding 82 in other this transformer 8
1/ n
2Not only determine the initial lead angle of line current, and the leap magnitude of voltage of decision large-scale capacitor 35, again, this flyback converter 4 is made up of second winding 82 and the tertiary winding 83 connection large-scale capacitor 35, switch 34 (MOSFET), the 3rd diode 41 and output capacitance 42; Constitute brand-new exchanging of flyback current harmonics correction in this way and change direct current transducer.
And the restriction that direct current transducer satisfies the input harmonic current of IEC61000-3-2 code requirement is changeed in exchanging of flyback current harmonics of the present invention correction, and provide the reaction of quick output rule to adopt the transformer 8 of multiple coiling, the present invention significantly reduces half to the core size and the weight of transducer, and can be via the turn ratio n that adjusts first winding 81 and second winding 82
1/ n
2, and rationally reduce the large-scale capacitor value, therefore, this patent exchanges shown in the calcspar that changes direct current transducer as Fig. 3 and Fig. 4 the present invention that arranges in pairs or groups applicable to the cataclysm of line voltage.
In addition, by Fig. 5, shown in Figure 6, main current i
N1Be designed to low pass filter in the direct current input capacitance 6 (filter capacitor) of change-over circuit and make the linear heat generation rate signal reach the present invention's transducer, filter and switch signal and lead ground connection, so electric current I ac is i
N1The part of line current frequency basic wave.And ω (t1-t0) is called the initial angle of flow (StartingConduction Angle is called for short SCA), little SCA has high power factor and low THD (Totally Harmonic Distortion total harmonic distortion), ICA is for just establishing condition (abbreviation of Initial Conduction Angle) among Fig. 5, Fig. 6 is initial conduction angle curves, operating condition is at Vo/Vm, and different duty ratio D and n1/n2 are when n2/n3=2.
And by shown in Figure 7, it is to provide chart conveniently to choose first winding 81, the tertiary winding 83 (n1/n3) for design, and SCA is with the scope of decision Vc2.Wherein, large-scale capacitor 35 terminal voltage Vc2 are according to Vm, the SCA and first winding 81, the tertiary winding 83 (n1/n3) change and change, but can not change to load 7 sides, the general commercial Vc2 that uses keeps below 450V, according to selecting first winding 81, the tertiary winding 83 (n1/n3) SCA, second winding 82, the tertiary winding 83 (n2/3) can effectively be adjusted the magnitude of voltage of Vc2 simultaneously.
By shown in Figure 8, it is to provide to select first inductance 31 again, makes to change handoff functionality at first diode 32, second diode 33.Wherein the design of first inductance 31 is changeed handoff functionality to first diode 32 and second diode 33 in order to provide, and when electric current I N1 reduced, it is zero that first inductance 31 causes that electric current I N1 linearity is reduced to, and closes second diode 33 and make and do not have switch cost.In addition, when IN1 increases, first inductance 31 cause IN1 linear increase to start from scratch and 32 conductings of first diode are reached do not have switch cost.
The present invention's experimental result experimental circuit operation input voltage 85V-265V/ac (alternating current) transformer turn ratio n1/n2/n3=2.38/2/1: first inductance 31 compares L1/LN1=0.17, as shown in Figure 9, be the Harmonic Distribution of experimental circuit, harmonic content is observed the demand of grade D; For another shown in Figure 10, its Harmonic Distribution of online circulation line current down adopts IEC6100-3-2 winning post standard, again by shown in Figure 11, under the 220V/ac input voltage to half dynamic response of full load, its output voltage tool fast reaction and the stable characteristic of adjusting; And shown in Figure 12 by this, large-scale capacitor 35 terminal voltages of different input voltages under full load.Large-scale capacitor 35 terminal voltages can be according to the turn ratio n1/n3 of Vac and first winding 81, the tertiary winding 83, but electric capacity 35 terminal voltages can not change to load current.
The present invention has quick dynamic response and the function of voltage adjustment closely in sum, can adopt single-stage single-switch and simple control loop to implement, and one group of coiling of the many employings of the present invention to replace the large-scale inductance of conventional converters, so can be saved 1/2 electromagnetic material volume and weight.Converter current of the present invention shown in this experimental result meets IEC6100-3-2 winning post standard and voltage adjustment closely according to load variations again.Big basic electric capacity can remain under the 450V according to the full range operation (85V-265V/ac) of adjusting turn ratio n1/n3.
Certainly the present invention's transducer 4 is except that the transducer 4 that can be above-mentioned flyback, also can be the transducer 4 (as shown in figure 13) of a forward type, and the transducer 4 of this forward type connects large-scale capacitor 35, switch 34 (MOSFET), the 3rd diode 41, the 4th diode 43, second inductance 311 and output capacitance 42 by second winding 82 and the tertiary winding 83 and is formed, and can reach the above-mentioned effect of being put forward during by the transducer 4 of forward type equally when the present invention's transducer 4.
The present invention possesses quick output loading regulation, transformer in transducer has three windings, and replace big inductance of the prior art, can save the magnetic material of half nearly, the adjustment that sees through three winding number of turns can make the withstand voltage 450v/dc of being lower than of input capacitance, even the scope of input voltage 90v/ac-265v/ac also can allow the withstand voltage 450v/dc of being lower than of input capacitance, this part is very important characteristic, and this novel transducer input current meets the IEC61000-3-2 code requirement simultaneously.
Claims (5)
1, direct current transducer is changeed in exchanging of a kind of flyback current harmonics correction, mode with electric property coupling is connected with input filter, full-bridge rectifier, booster circuit, exchanging changes direct current transducer and control integrated circuit IC, in booster circuit and the interchange commentaries on classics direct current transducer transformer is set, this transformer has first winding, second winding and the tertiary winding, this first winding and second winding are around primary side, this tertiary winding is at secondary side, the tertiary winding and first, the polarity of second winding is opposite, and this first winding belongs to the part of booster circuit, and this second winding and the tertiary winding belong to the part of transducer, it is characterized in that booster circuit connects first inductance and first diode by first winding, second diode, a fet switch and a large-scale capacitor are formed, first winding connects first inductance, one end, the first inductance other end connects first diode, the anode of second diode, the negative terminal of first diode connects large-scale capacitor, and the negative terminal of second diode connects fet switch; Transducer connects described large-scale capacitor, fet switch, the 3rd diode and output capacitance by second winding and the tertiary winding and is formed, one end of second winding connects described large-scale capacitor, the other end of second winding connects fet switch, one end of the tertiary winding connects the anode of the 3rd diode, the negative terminal of the 3rd diode connects output capacitance one end, and the other end of the tertiary winding connects the other end of output capacitance.
2, exchanging of flyback current harmonics according to claim 1 correction changeed direct current transducer, it is characterized in that first inductance is the soft handover inductance, and to first diode, the second diode tool soft handover function, when the linearity of electric current reduces to zero, electric current via first inductance and second diode is closed, and has the effect of zero switch cost.
3, flyback current harmonics according to claim 1 correction exchange to change direct current transducer, it is characterized in that the turn ratio n of first winding and second winding in the transformer
1/ n
2Not only determine the initial lead angle of line current, and the leap magnitude of voltage of decision large-scale capacitor.
4, flyback current harmonics according to claim 1 correction exchange to change direct current transducer, it is characterized in that transducer and the control integrated circuit IC load of also having arranged in pairs or groups.
5, direct current transducer is changeed in exchanging of a kind of forward type current harmonics correction, mode with electric property coupling is connected with input filter, full-bridge rectifier, booster circuit, exchanging changes direct current transducer and control integrated circuit IC, in booster circuit and the interchange commentaries on classics direct current transducer transformer is set, this transformer has first winding, second winding and the tertiary winding, this first winding and second winding are around primary side, this tertiary winding is at secondary side, the tertiary winding and first, the polarity of second winding is identical, and this first winding belongs to the part of booster circuit, and this second winding and the tertiary winding belong to the part of transducer, it is characterized in that booster circuit connects first inductance and first diode by first winding, second diode, a fet switch and a large-scale capacitor are formed, first winding connects first inductance, one end, the first inductance other end connects first diode, the anode of second diode, the negative terminal of first diode connects large-scale capacitor, and the negative terminal of second diode connects fet switch; Transducer connects described large-scale capacitor by second winding and the tertiary winding, fet switch, the 3rd diode, output capacitance, the 4th diode and second inductance are formed, one end of second winding connects described large-scale capacitor, the other end of second winding connects fet switch, one end of the tertiary winding connects the anode of the 3rd diode, the negative terminal of the 3rd diode connects the negative terminal of the 4th diode and an end of second inductance, the other end of second inductance connects an end of output capacitance, and the other end of the tertiary winding connects the other end of output capacitance and the anode of the 4th diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031246206A CN100568693C (en) | 2003-07-04 | 2003-07-04 | AC-to-DC converter with flyback and forward current harmonic correction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031246206A CN100568693C (en) | 2003-07-04 | 2003-07-04 | AC-to-DC converter with flyback and forward current harmonic correction |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1592065A CN1592065A (en) | 2005-03-09 |
| CN100568693C true CN100568693C (en) | 2009-12-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031246206A Expired - Fee Related CN100568693C (en) | 2003-07-04 | 2003-07-04 | AC-to-DC converter with flyback and forward current harmonic correction |
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| Country | Link |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102202438A (en) * | 2010-03-22 | 2011-09-28 | 立锜科技股份有限公司 | Power supply device capable of reducing power consumption |
| AU2012202371A1 (en) * | 2012-04-23 | 2013-11-07 | Lin, Fu Xiang | A half-bridge and full-bridge single stage PFC power converter |
| CN110492717A (en) * | 2019-07-01 | 2019-11-22 | 联想(北京)有限公司 | A kind of processing equipment and processing method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1151630A (en) * | 1995-10-16 | 1997-06-11 | 计算机产品公司 | Input harmonic current corrected AC- to DC converter with multiple coupled primary windings |
| CN1286523A (en) * | 2000-10-19 | 2001-03-07 | 南京航空航天大学 | Sigle-stage AC/DC converter with power factor correction |
| JP2002315327A (en) * | 2001-04-06 | 2002-10-25 | Akihiko Yonetani | Flyback converter with improved power factor |
-
2003
- 2003-07-04 CN CNB031246206A patent/CN100568693C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1151630A (en) * | 1995-10-16 | 1997-06-11 | 计算机产品公司 | Input harmonic current corrected AC- to DC converter with multiple coupled primary windings |
| CN1286523A (en) * | 2000-10-19 | 2001-03-07 | 南京航空航天大学 | Sigle-stage AC/DC converter with power factor correction |
| JP2002315327A (en) * | 2001-04-06 | 2002-10-25 | Akihiko Yonetani | Flyback converter with improved power factor |
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| Publication number | Publication date |
|---|---|
| CN1592065A (en) | 2005-03-09 |
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Effective date of registration: 20090904 Address after: Taiwan, China Hsinchu University Road, No. 1001 Applicant after: Spring Foundation of NCTU Address before: No. 1001, University Road, Hsinchu, Taiwan Applicant before: Zhang Longguo |
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