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 PDFInfo
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- 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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- Prior art keywords
- power factor
- pfc converter
- isolating transformer
- factor correction
- way switch
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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- 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
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).
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CN201510194461.1A CN106160522A (en) | 2015-04-22 | 2015-04-22 | A kind of flyback power factor correction pfc converter without bridge construction |
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CN201510194461.1A CN106160522A (en) | 2015-04-22 | 2015-04-22 | A kind of flyback power factor correction pfc converter without bridge construction |
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Cited By (5)
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 |
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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 |
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Cited By (6)
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 |