CN106160522A - A kind of flyback power factor correction pfc converter without bridge construction - Google Patents

A kind of flyback power factor correction pfc converter without bridge construction Download PDF

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Publication number
CN106160522A
CN106160522A CN201510194461.1A CN201510194461A CN106160522A CN 106160522 A CN106160522 A CN 106160522A CN 201510194461 A CN201510194461 A CN 201510194461A CN 106160522 A CN106160522 A CN 106160522A
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CN
China
Prior art keywords
power factor
pfc converter
isolating transformer
factor correction
way switch
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201510194461.1A
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Chinese (zh)
Inventor
陈博洋
李磊
孙正洋
周帆
周一帆
刘志祥
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Nanjing University of Science and Technology
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Nanjing University of Science and Technology
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Priority to CN201510194461.1A priority Critical patent/CN106160522A/en
Publication of CN106160522A publication Critical patent/CN106160522A/en
Pending legal-status Critical Current

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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10Technologies 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
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00Climate change mitigation technologies for sector-wide applications
    • Y02P80/10Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier

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  • Rectifiers (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The present invention provides a kind of flyback power factor correction pfc converter without bridge construction, including: isolating transformer, two-way switch, secondary side diode bridge rectifier, output capacitance and load, wherein: two-way switch is made up of the switching tube of two series connection, wherein the source electrode of these two switching tubes shares with grid, drives signal to be added between grid and the source electrode that two switching tubes share;Any one end, limit former with isolating transformer, one end of voltage source in main power circuit is connected, and the isolating transformer former limit other end is connected with any one end of two-way switch, and the other end of two-way switch is connected with the other end of voltage source;The secondary of isolating transformer is connected with diode rectifier circuit, and diode rectifier circuit is in parallel with storage capacitor and load.The flyback power factor correction pfc converter of the present invention, eliminates the defect of current over-zero distortion, reduces conduction loss simultaneously, in the case of power factor is constant, improve whole efficiency.

Description

A kind of flyback power factor correction pfc converter without bridge construction
Technical field
The present invention relates to electric and electronic technical field, the output of the lowest Harmonics of Input, low pressure, high efficiency power factor Alignment technique, is specifically related to a kind of flyback power factor correction pfc converter without bridge construction.
Background technology
In recent years, Power Electronic Technique develops rapidly, and the power technology as field of power electronics important component part is increasingly becoming Application and the focus of research.Switching Power Supply is high with its efficiency, power density high and establishes its dominant position in field of power supplies, But cause input current to be distorted when accessing different loads, generate reactive power and create the dirt of substantial amounts of electric current higher hamonic wave Dye electrical network.Improving power factor of electric network mainly has two ways, traditional mode to be PPFC, i.e. by passive Element carries out reactive-load compensation, but the raising of limiting device power density is often passive element, i.e. electric capacity and inductance.Novel Switch power technology is Active Power Factor Correction Technology, is switched on-off by control and forces input current to follow input voltage The mode of change improves power factor, has given up the passive element of heaviness, has made the power density of equipment improve further.
PFC PFC belongs to AC-DC conversion, and tradition exists rectifier bridge due to the former limit of isolating transformer, and rectifier bridge In diode there is conduction voltage drop, cause the curent change when current over-zero not follow change in voltage, form current over-zero abnormal Become, need in control circuit, add feedforward link to eliminate current over-zero distortion, considerably increase the complexity of control circuit. Meanwhile, electric current creates certain loss when flowing through the diode in rectifier bridge, and its loss size turns on pressure with the on-state of diode Drop relevant with input average current.And in conventional transducers, the voltage stress being added in commutation diode two ends is relatively big, therefore it is available for choosing The on-state conduction voltage drop of the commutation diode selected is relatively big, and loss is relatively big, thus have impact on whole efficiency.
Summary of the invention
In view of the above deficiency of prior art, present invention aim at providing a kind of flyback power factor correction PFC without bridge construction Changer, has the most succinct, High Power Factor, the advantage of available soft switch technique.
The above-mentioned purpose of the present invention is realized by the technical characteristic of independent claims, and dependent claims is with alternative or favourable side The technical characteristic of formula development independent claims.
For reaching above-mentioned purpose, the present invention proposes a kind of flyback power factor correction pfc converter without bridge construction, including: every From transformator T, two-way switch S, secondary side diode bridge rectifier, output capacitance Co, and load R, wherein:
Two-way switch S is by the switching tube Q of two series connectiona、QbComposition, wherein switching tube Qa, QbSource S and grid G altogether With, drive signal to be added between grid and the source electrode that two switching tubes share;
Any one end, limit former with isolating transformer, one end of voltage source in main power circuit is connected, the isolating transformer former limit other end Being connected with any one end of two-way switch S, the other end of two-way switch S is connected with the other end end of voltage source;
The secondary of isolating transformer is connected with diode rectifier circuit, and diode rectifier circuit is with storage capacitor Co and load R also Connection.
Compared with existing, the invention has the beneficial effects as follows:
1, relative to traditional flyback pfc converter, flyback power factor correction PFC without bridge construction of the present invention is used to become Parallel operation, with tradition flyback PFC compared with, eliminate current over-zero distortion defect, reduce conduction loss simultaneously, power because of In the case of number is constant, improve whole efficiency.
2, the flyback power factor correction pfc converter without bridge construction of the present invention is used, can be according to input voltage, defeated Going out the requirement of voltage, output, overall efficiency, the parameter of appropriate design magnetics, flexible configuration is without the flyback of bridge construction The component parameter of PFC pfc converter.
3, the flyback power factor correction pfc converter without bridge construction of the present invention is succinctly efficient, and only a set of control circuit of need can To realize PFC, low cost, reliability is high.
4, the flyback power factor correction pfc converter without bridge construction of the present invention, primary current can be with two-way flow, for profit Reduce switching loss with soft switch technique and provide theoretical basis.
As long as should be appreciated that all combinations of aforementioned concepts and the extra design described in greater detail below are at such structure Think the most conflicting in the case of can be viewed as the part of subject matter of the disclosure.It addition, theme required for protection All combinations be considered as the part of subject matter of the disclosure.
The foregoing and other aspect that can be more fully appreciated with from the following description in conjunction with accompanying drawing present invention teach that, embodiment and Feature.Feature and/or the beneficial effect of other additional aspect such as illustrative embodiments of the present invention will show in the following description See, or by the practice according to the detailed description of the invention that present invention teach that is learnt.
Accompanying drawing explanation
Accompanying drawing is not intended to drawn to scale.In the accompanying drawings, each identical or approximately uniform ingredient illustrated in each figure Can be indicated by the same numeral.For clarity, in each figure, the most each ingredient is the most labeled.Now, By by example embodiment that various aspects of the invention are described in reference to the drawings, wherein:
Fig. 1 is to illustrate according to certain embodiments of the present invention, without the structure of the flyback power factor correction pfc converter of bridge construction Schematic diagram.
Fig. 2 is the equivalent schematic of the two-way switch S that this present invention is described.
Fig. 3 is that the former secondary current waveform signal that present invention is operated in discontinuous mode (DCM) is described Figure.
Fig. 4 is to illustrate that present invention is 110Vac and 220Vac at input voltage, and frequency is to be operated in electricity during 50Hz The waveform diagram of input current, input voltage and output voltage under inducing current discontinuous mode (DCM).
Fig. 5 is an illustrative diagram of control circuit.
Detailed description of the invention
In order to know more about the technology contents of the present invention, especially exemplified by specific embodiment and coordinate institute's accompanying drawings to be described as follows.
Each side the most with reference to the accompanying drawings to describe the present invention, the embodiment illustrated shown in the drawings of many.The disclosure Embodiment must not be intended to include all aspects of the invention.Should be appreciated that multiple design presented hereinbefore and embodiment, with And describe in more detail below those design and embodiment can in many ways in any one is implemented, this is to should be Design disclosed in this invention and embodiment are not limited to any embodiment.It addition, aspects more disclosed by the invention can be single Solely use, or otherwise any appropriately combined use with disclosed by the invention.
Shown in Fig. 1, a kind of flyback power factor correction pfc converter without bridge construction that the disclosure proposes, including: every From transformator T, two-way switch S, secondary side diode bridge rectifier, output capacitance Co, and load R.
Shown in Fig. 2, two-way switch S is by the switching tube Q of two series connectiona、QbComposition, wherein switching tube Qa, QbSource Pole S shares with grid G, drives signal to be added between grid and the source electrode that two switching tubes share.
Voltage source V in main power circuitinOne end be connected with any one end, former limit of isolating transformer T, isolating transformer T The former limit other end be connected with any one end of two-way switch S, the other end of two-way switch S and voltage source VinOther end end phase Even.
The secondary of isolating transformer T is connected with diode rectifier circuit, diode rectifier circuit and storage capacitor Co and load R In parallel.
As it is shown in figure 1, control circuit be applied to aforementioned two-way switch S two switching tubes share grid and source electrode between, with And it is applied to one end of diode rectifier circuit.As Fig. 5 indicates a concrete example of control circuit.
Shown in Fig. 1, if input voltage is vin=VmSin (ω t), wherein VmFor input voltage maximum, output voltage is Vo, The transformer primary secondary turn ratio meets n > Vm/Vo
The aforementioned flyback power factor correction pfc converter without bridge construction operationally, is divided into two stages: startup stage and steady Determine the stage, separately below the two stage is illustrated.
1. startup stage:
Being zero due to storage capacitor voltage during startup, in each switch periods, during switch conduction, former secondary simultaneously turns on and fills to electric capacity Electricity, during switch OFF, capacitance voltage keeps constant.Startup stage until storage capacitor CoVoltage reaches Vm/n。
2. the stabilization sub stage:
Entering after stablizing mode, in each switch periods, during switch conduction, input voltage is vin=VmSin (ω t), due to folding The voltage swing calculating transformer secondary is Vm/ n < Vo, according to Kirchoff s voltage theorem (KVL), during the conducting of former limit, secondary is not Conducting, energy storage is in transformator.After switch OFF, the energy in transformator transfers to secondary, for storage capacitor and load Power supply.Contrast traditional rectifier bridge flyback PFC on the former limit of isolating transformer, kept off by secondary backward diode during the conducting of former limit Live current flowing, so that secondary is not turned on during the conducting of former limit.And its rectifier bridge of the present invention program is in isolating transformer secondary, profit With Kirchoff s voltage theorem (KVL), by adjusting transformer turns ratio n so that during the conducting of former limit, secondary is not turned on, and rectification In bridge, diode voltage stress is only output voltage size, first eliminates the defect of current over-zero distortion from principle, secondly exists When selecting commutation diode, the diode that optional on-state conduction voltage drop is less, thus improve whole efficiency.
This flyback power factor correction pfc converter is controlled by voltage mode control or peak-current mode.
This flyback power factor correction pfc converter is externally controlled drives and works in the one in following pattern: electric current Continuous mode (CCM), electric current critical continuous conduction mode (CRM), discontinuous conduct mode (DCM).
Fig. 3 is the former secondary current waveform that present example one is operated in discontinuous mode (DCM).
Fig. 4 is that the embodiment of the present invention one is 110Vac and 220Vac at input voltage, and when frequency is 50Hz, output voltage is 100V, Output is 100W, is operated in input current, input voltage and output voltage under discontinuous mode (DCM) Waveform, it can be seen that changer all can work in full voltage range normal table, it is achieved that power factor school Positive function.
Although the present invention is disclosed above with preferred embodiment, so it is not limited to the present invention.The technical field of the invention Middle tool usually intellectual, without departing from the spirit and scope of the present invention, when being used for a variety of modifications and variations.Therefore, originally The protection domain of invention is when being as the criterion depending on those as defined in claim.

Claims (3)

1. the flyback power factor correction pfc converter without bridge construction, it is characterised in that including: isolating transformer, double To switch, secondary side diode bridge rectifier, output capacitance and load, wherein:
Two-way switch is made up of the switching tube of two series connection, and wherein the source electrode of these two switching tubes shares with grid, drives signal to add Between grid and the source electrode that two switching tubes share;
Any one end, limit former with isolating transformer, one end of voltage source in main power circuit is connected, the isolating transformer former limit other end Being connected with any one end of two-way switch, the other end of two-way switch is connected with the other end end of voltage source;
The secondary of isolating transformer is connected with diode rectifier circuit, and diode rectifier circuit is in parallel with storage capacitor and load.
Flyback power factor correction pfc converter without bridge construction the most according to claim 1, it is characterised in that this is anti- Excited power factor correcting pfc converter is controlled by voltage mode control or peak-current mode.
Flyback power factor correction pfc converter without bridge construction the most according to claim 1, it is characterised in that this is anti- Excited power factor correcting pfc converter is externally controlled drives and works in the one in following pattern: continuous current mode (CCM), electric current critical continuous conduction mode (CRM), discontinuous conduct mode (DCM).
CN201510194461.1A 2015-04-22 2015-04-22 A kind of flyback power factor correction pfc converter without bridge construction Pending CN106160522A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106879110A (en) * 2017-02-20 2017-06-20 广东工业大学 A kind of LED drive circuit based on non-bridge PFC
CN106982495A (en) * 2017-05-15 2017-07-25 广东工业大学 A kind of LED drive circuit and LED illumination System
CN109962632A (en) * 2017-12-25 2019-07-02 中国长城科技集团股份有限公司 A kind of no bridge rectification circuit and Switching Power Supply
CN113839547A (en) * 2020-06-23 2021-12-24 维谛公司 Starting method and circuit of totem-pole circuit
CN117060748A (en) * 2023-08-21 2023-11-14 哈尔滨工业大学 Single-stage bridgeless isolation flyback rectifier based on double-capacitance output structure

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US20080238377A1 (en) * 2007-03-30 2008-10-02 Stmicroelcetronics S.R.L. Device for transforming and stabilizing a primary ac voltage for supplying an electric load
US20100181963A1 (en) * 2009-01-20 2010-07-22 Semikron Elektronik Gmbh & Co. Kg Battery Charger and Method for its Operation
CN102368662A (en) * 2011-03-10 2012-03-07 杭州士兰微电子股份有限公司 Current reference generation circuit, constant current switch power supply control circuit and control method thereof

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US20080238377A1 (en) * 2007-03-30 2008-10-02 Stmicroelcetronics S.R.L. Device for transforming and stabilizing a primary ac voltage for supplying an electric load
US20100181963A1 (en) * 2009-01-20 2010-07-22 Semikron Elektronik Gmbh & Co. Kg Battery Charger and Method for its Operation
CN102368662A (en) * 2011-03-10 2012-03-07 杭州士兰微电子股份有限公司 Current reference generation circuit, constant current switch power supply control circuit and control method thereof

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106879110A (en) * 2017-02-20 2017-06-20 广东工业大学 A kind of LED drive circuit based on non-bridge PFC
CN106982495A (en) * 2017-05-15 2017-07-25 广东工业大学 A kind of LED drive circuit and LED illumination System
CN109962632A (en) * 2017-12-25 2019-07-02 中国长城科技集团股份有限公司 A kind of no bridge rectification circuit and Switching Power Supply
CN113839547A (en) * 2020-06-23 2021-12-24 维谛公司 Starting method and circuit of totem-pole circuit
CN113839547B (en) * 2020-06-23 2024-01-30 维谛公司 Starting method and circuit of totem pole circuit
CN117060748A (en) * 2023-08-21 2023-11-14 哈尔滨工业大学 Single-stage bridgeless isolation flyback rectifier based on double-capacitance output structure

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Application publication date: 20161123