CN105896988A - Current continuous mode flyback switching power supply transformer magnetic core selection method - Google Patents

Current continuous mode flyback switching power supply transformer magnetic core selection method Download PDF

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Publication number
CN105896988A
CN105896988A CN201610214776.2A CN201610214776A CN105896988A CN 105896988 A CN105896988 A CN 105896988A CN 201610214776 A CN201610214776 A CN 201610214776A CN 105896988 A CN105896988 A CN 105896988A
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CN
China
Prior art keywords
transformer
magnetic core
end points
primary side
value
Prior art date
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
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CN201610214776.2A
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Chinese (zh)
Inventor
康龙云
李臻
冯腾
王书彪
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South China University of Technology SCUT
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South China University of Technology SCUT
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Priority to CN201610214776.2A priority Critical patent/CN105896988A/en
Publication of CN105896988A publication Critical patent/CN105896988A/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
    • H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The present invention discloses a current continuous mode flyback switching power supply transformer magnetic core selection method. The method comprises the steps of (1) calculating an effective sectional area theoretical value of a transformer magnetic core; (2) calculating a window area theoretical value of the transformer magnetic core; (3) calculating the product AP of the effective sectional area theoretical value and the window area theoretical value of the transformer magnetic core; (4) querying a manufacturing parameter of an actual EI type transformer magnetic core or EE type transformer magnetic core, calculating the product APre of the magnetic core effective sectional area and the window area of an actual transformer, and selecting the transformer magnetic core of which the product APre is greater than the product AP, and the product APre closest approaches the product AP. The current continuous mode flyback switching power supply transformer magnetic core selection method of the present invention can select the more ideal transformer magnetic core aiming at different power design requirements and frequency design requirements, and has the important significance for the performance improvement of a current continuous mode flyback switching power supply.

Description

A kind of continuous current mode reverse exciting switching voltage regulator magnetic core of transformer system of selection
Technical field
The present invention relates to Switching Power Supply research field, particularly to a kind of continuous current mode reverse exciting switching voltage regulator transformator Magnetic core system of selection.
Background technology
Transformator is the critical component of the storage of continuous current mode reverse exciting switching voltage regulator energy and transmission, the magnetic core of transformator Select most important for the performance of continuous current mode reverse exciting switching voltage regulator.Excessive magnetic core can increase continuous current mode The volume of reverse exciting switching voltage regulator and the utilization rate of magnetic core are low, and too small magnetic core there will be saturated phenomenon and causes continuous current mode anti- Exciting switching voltage regulator cisco unity malfunction.Select the magnetic core of continuous current mode reverse exciting switching voltage regulator for reducing electric current even rightly The volume of Discontinuous Conduction mode reverse exciting switching voltage regulator, the performance of motor current continuous mode reverse exciting switching voltage regulator have great significance.Pass The system of selection of system select high frequency transformer magnetic core, computing formula to open for high frequency according to the selection method of Industrial Frequency Transformer It is inaccurate for closing power supply.
Summary of the invention
It is an object of the invention to the shortcoming overcoming prior art with not enough, it is provided that a kind of continuous current mode flyback switch Mains transformer magnetic core system of selection, can require for different power designs according to the method and Frequency Design requires choosing Selecting out ideal magnetic core of transformer, the performance boost for continuous current mode reverse exciting switching voltage regulator is significant.
The purpose of the present invention is realized by following technical scheme: a kind of continuous current mode reverse exciting switching voltage regulator transformator Magnetic core system of selection, including step:
(1) the net sectional area theoretical value of calculating transformer magnetic coreWherein, UinRepresent the electric current progressive die Formula reverse exciting switching voltage regulator DC input voitage, D is the ratio of switching tube ON time and whole switch periods, referred to as dutycycle, NpFor the coil turn of transformer primary side, Δ BmThe maximum change of magnetic core of transformer intrinsic inductance during turning on for transformator Amount, and residual magnetic flux density B of magnetic core of transformerrWith Δ BmSum is less than saturation induction density B of magnetic core of transformers, f For switching frequency；
(2) the window area theoretical value of calculating transformer magnetic coreWherein, IprmsFor transformator The current value virtual value on former limit, availableCalculate (wherein, IpmElectricity for transformer primary side Stream maximum, Krp=Ir/IpmFor proportionality coefficient, IrFor primary side current of transformer rising value), IsrmsElectric current for transformer secondary Value virtual value, availableCalculate (wherein, IsmElectric current for transformer secondary is maximum Value) NsFor the coil turn of transformer secondary, J is the electric current density flow through in transformer coil, KoWindow for transformator utilizes Rate, 0 < Ko<1；
(3) the net sectional area theoretical value of calculating transformer magnetic core and the product of window area theoretical valueSwitch tube is opened before and after's applied energy conservation law and combines the public affairs of inductance Formula, can obtain relational expression NpIpm=NsIsm, soWherein Po For the rated output power of reverse exciting switching voltage regulator, η is the power transmission efficiency of reverse exciting switching voltage regulator；
(4) inquire about actual EI type magnetic core of transformer or the Fabrication parameter of EE type magnetic core of transformer, calculate real transformer Net sectional area and the product AP of window areare, choose APre>=AP and APreIt is worth the magnetic core of transformer conduct closest to AP value The magnetic core of transformer selected.
Concrete, described magnetic core system of selection is based on following circuit topological structure: DC input voitage UinPositive pole with Transformer primary side end points 1 connects, and the end points 2 of transformer primary side is connected to DC input voitage U through switching tube QinNegative pole, open Closing pipe Q to be used for controlling turning on and off of transformer primary side loop, the end points 3 of transformer secondary is connected with the anode of diode D, The end points that the negative electrode of diode D is high with voltage in electric capacity C is connected, the end points that in electric capacity C, voltage is low and the end points 4 of transformer secondary Connecting, the end points 1 of transformer primary side and end points 4 Same Name of Ends each other of secondary, two end-point voltage polarity of Same Name of Ends are same each other Shi Weizheng or be simultaneously negative.
Further, the work process of described continuous current mode reverse exciting switching voltage regulator is: switch periods T In, switching tube Q turns off after opening the DT time, and D is the ratio of switching tube ON time and whole switch periods, referred to as dutycycle, When switching tube Q turns on, end points 1 voltage of transformer primary side is positive polarity, and end points 3 voltage of secondary is negative polarity, diode Cannot turn on, primary side current of transformerLpFor transformer primary side inductance value, t is the time, at DT moment, transformer primary The current value on limit is maximum, forDT moment switching tube Q turns off, and end points 3 polarity of voltage of transformer secondary is just Polarity, diode current flow, the secondary current of transformator after diode current flowUoFor electric capacity C On voltage, polarity is just, LsSecondary inductance value for transformator.
The present invention compared with prior art, has the advantage that and beneficial effect:
Present invention work process based on continuous current mode reverse exciting switching voltage regulator, disclosing one, to be suitable for electric current continuous The method of the transformator type selecting of pattern reverse exciting switching voltage regulator, can require for different power designs and frequency according to the method Rate design requires to select ideal magnetic core of transformer, and the performance boost for continuous current mode reverse exciting switching voltage regulator has Significant.
Accompanying drawing explanation
Fig. 1 be method described in the present embodiment based on continuous current mode reverse exciting switching voltage regulator circuit topology figure.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention do not limit In this.
Embodiment 1
The present embodiment one continuous current mode reverse exciting switching voltage regulator magnetic core of transformer system of selection, based on shown in Fig. 1 The circuit topology figure of continuous current mode reverse exciting switching voltage regulator, concrete structure is as follows: DC input voitage UinPositive pole and transformation Device primary side end point 1 connects, and the end points 2 of transformer primary side is connected to DC input voitage U through switching tube QinNegative pole, switching tube Q is for controlling turning on and off of transformer primary side loop, and the end points 3 of transformer secondary is connected with the anode of diode D, two poles The end points that the negative electrode of pipe D is high with voltage in electric capacity C is connected, and the end points that in electric capacity C, voltage is low connects with the end points 4 of transformer secondary Connecing, the end points 1 of transformer primary side and end points 4 Same Name of Ends each other of secondary, two end-point voltage polarity of Same Name of Ends are simultaneously each other For being just or simultaneously negative.
The work process of described continuous current mode reverse exciting switching voltage regulator is: in switch periods T, switching tube Q opens Turning off after the logical DT time, D is the ratio of switching tube ON time and whole switch periods, referred to as dutycycle, when switching tube Q turns on Time, end points 1 voltage of transformer primary side is positive polarity, and end points 3 voltage of secondary is negative polarity, and diode cannot turn on, transformation Device primary currentLpFor transformer primary side inductance value, t is the time, and in the DT moment, the current value of transformer primary side is Greatly, forDT moment switching tube Q turns off, and end points 3 polarity of voltage of transformer secondary is positive polarity, diode Conducting, the secondary current of transformator after diode current flowUoFor the voltage on electric capacity C, polarity For just, LsSecondary inductance value for transformator.
The present embodiment one continuous current mode reverse exciting switching voltage regulator magnetic core of transformer system of selection, including step:
The first step, determines net sectional area theoretical value A of magnetic core of transformereExpression formula.
Relational expression is existed for continuous current mode reverse exciting switching voltage regulatorNpFor transformer primary side Coil turn, AeThe net sectional area of magnetic core of transformer, Δ BmMagnetic core of transformer intrinsic inductance during turning on for switching tube Q Maximum variable quantity, residual magnetic flux density B of magnetic core of transformerrWith Δ BmSum is less than the saturation induction of magnetic core of transformer Intensity Bs, therefore the net sectional area theoretical value expression formula of magnetic core of transformer isF be switching frequency and
Second step, determines window area theoretical value A of magnetic core of transformerwExpression formula.
Set the window utilization rate of transformator as 0 < Ko< 1, set the electric current density that flows through in transformer coil as J, according to Relational expressionThe window area determining transformator is
3rd step, determines the net sectional area theoretical value of magnetic core of transformer and the product AP=A of window area theoretical valueeAw。
Transformator net sectional area theoretical value is multiplied with the window area theoretical value of transformator and obtainsSwitch tube is opened before and after's applied energy conservation law and combines the formula of inductance, Relational expression N can be obtainedpIpm=NsIsm, soIts Middle PoFor the rated output power of reverse exciting switching voltage regulator, η is the power transmission efficiency of reverse exciting switching voltage regulator.
4th step, according to the 3rd calculated AP=A of stepeAwSelect transformator.
The net sectional area of real transformer magnetic core and the product of window area are designated as APre, inquire about actual EI type transformator Magnetic core or the Fabrication parameter of EE type magnetic core of transformer, choose APre>=AP and APreIt is worth the magnetic core of transformer closest to AP value to make For the magnetic core of transformer selected.
Above-described embodiment is the present invention preferably embodiment, but embodiments of the present invention are not by above-described embodiment Limit, the change made under other any spirit without departing from the present invention and principle, modify, substitute, combine, simplify, All should be the substitute mode of equivalence, within being included in protection scope of the present invention.

Claims (3)

1. a continuous current mode reverse exciting switching voltage regulator magnetic core of transformer system of selection, it is characterised in that comprise the steps:
(1) the net sectional area theoretical value of calculating transformer magnetic coreWherein UinRepresent that continuous current mode is anti- Exciting switching voltage regulator DC input voitage, D is the ratio of switching tube ON time and whole switch periods, referred to as dutycycle, NpFor The coil turn of transformer primary side, Δ BmThe maximum variable quantity of magnetic core of transformer intrinsic inductance during turning on for transformator, And residual magnetic flux density B of magnetic core of transformerrWith Δ BmSum is less than saturation induction density B of magnetic core of transformers, f is for opening Close frequency；
(2) the window area theoretical value of calculating transformer magnetic coreWherein IprmsFor transformer primary side Current value virtual value, pass throughCalculate, wherein IpmElectric current for transformer primary side is maximum Value, Krp=Ir/IpmFor proportionality coefficient, IrFor primary side current of transformer rising value, IsrmsCurrent value for transformer secondary is effective Value, passes throughCalculate, wherein IsmFor the current maxima of transformer secondary, NsFor becoming The coil turn of depressor secondary, J is the electric current density flow through in transformer coil, KoFor the window utilization rate of transformator, 0 < Ko< 1；
(3) the net sectional area theoretical value of calculating transformer magnetic core and the product of window area theoretical valueSwitch tube is opened before and after's applied energy conservation law and combines inductance Formula, obtain relational expression NpIpm=NsIsm, so
A P = 2 P o ( 2 - K r p ) f&eta;JK o &Delta;B m ( K r p 2 3 - K r p + 1 ) &times; ( D + 1 - D ) ,
Wherein PoFor the rated output power of reverse exciting switching voltage regulator, η is the power transmission efficiency of reverse exciting switching voltage regulator；
(4) inquire about actual EI type magnetic core of transformer or the Fabrication parameter of EE type magnetic core of transformer, calculate having of real transformer Effect sectional area and the product AP of window areare, choose APre>=AP and APreIt is worth closest to the magnetic core of transformer of AP value as selection Magnetic core of transformer.
Continuous current mode reverse exciting switching voltage regulator magnetic core of transformer system of selection the most according to claim 1, its feature exists In, described magnetic core system of selection is based on following circuit topological structure: DC input voitage UinPositive pole and transformer primary side end Point 1 connection, the end points 2 of transformer primary side is connected to DC input voitage U through switching tube QinNegative pole, switching tube Q is used for controlling Turning on and off of transformer primary side loop processed, the end points 3 of transformer secondary is connected with the anode of diode D, the moon of diode D The pole end points high with voltage in electric capacity C is connected, and the end points that in electric capacity C, voltage is low is connected with the end points 4 of transformer secondary, transformator The end points 1 on former limit and end points 4 Same Name of Ends each other of secondary, two end-point voltage polarity of Same Name of Ends be just or together simultaneously each other Time be negative.
Continuous current mode reverse exciting switching voltage regulator magnetic core of transformer system of selection the most according to claim 1 and 2, its feature Being, the work process of described continuous current mode reverse exciting switching voltage regulator is: in switch periods T, switching tube Q opens DT Turning off after time, D is the ratio of switching tube ON time and whole switch periods, referred to as dutycycle, when switching tube Q turns on, End points 1 voltage of transformer primary side is positive polarity, and end points 3 voltage of secondary is negative polarity, and diode cannot turn on, transformer primary Limit electric currentLpFor transformer primary side inductance value, t is the time, and in the DT moment, the current value of transformer primary side is maximum, forDT moment switching tube Q turns off, and end points 3 polarity of voltage of transformer secondary is positive polarity, diode current flow, The secondary current of transformator after diode current flowUoFor the voltage on electric capacity C, polarity is Just, LsSecondary inductance value for transformator.
CN201610214776.2A 2016-04-07 2016-04-07 Current continuous mode flyback switching power supply transformer magnetic core selection method Pending CN105896988A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111900879A (en) * 2020-07-21 2020-11-06 西安石油大学 Transformer of 12W flyback power converter and design method thereof

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101211191A (en) * 2006-12-25 2008-07-02 艾默生网络能源系统有限公司 Directional regulating circuit
CN103730249A (en) * 2013-12-30 2014-04-16 江苏林洋电子股份有限公司 Flyback transformer designing method for preventing interference of external high-intensity magnetic field
CN104967284A (en) * 2015-06-17 2015-10-07 华南理工大学 Discontinuous-current-mode flyback switch power supply transformer magnetic core selection method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101211191A (en) * 2006-12-25 2008-07-02 艾默生网络能源系统有限公司 Directional regulating circuit
CN103730249A (en) * 2013-12-30 2014-04-16 江苏林洋电子股份有限公司 Flyback transformer designing method for preventing interference of external high-intensity magnetic field
CN104967284A (en) * 2015-06-17 2015-10-07 华南理工大学 Discontinuous-current-mode flyback switch power supply transformer magnetic core selection method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111900879A (en) * 2020-07-21 2020-11-06 西安石油大学 Transformer of 12W flyback power converter and design method thereof

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Application publication date: 20160824