CN104638926A - Magnetic flux offset type high-efficiency flyback DC-DC (direct current-direct current) converter - Google Patents
Magnetic flux offset type high-efficiency flyback DC-DC (direct current-direct current) converter Download PDFInfo
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- CN104638926A CN104638926A CN201410102108.1A CN201410102108A CN104638926A CN 104638926 A CN104638926 A CN 104638926A CN 201410102108 A CN201410102108 A CN 201410102108A CN 104638926 A CN104638926 A CN 104638926A
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- Prior art keywords
- control
- transformer
- secondary winding
- magnetic flux
- synchronous rectifier
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Classifications
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- 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
- H02M3/33569—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 having several active switching elements
- H02M3/33576—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 having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33592—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 having several active switching elements having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
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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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention relates to a flyback DC-DC (direct current-direct current) converter, discloses a magnetic flux offset type high-efficiency flyback DC-DC converter and mainly solves the problem of power loss in cross conduction of a main switch and a synchronous rectifier of an existing flyback converter or loss caused by reverse recovery of an diode in the synchronous rectifier. The flyback DC-DC converter comprises a main transformer, a main switch S1, an input voltage source, a synchronous rectifier S2, an output load R0 and a capacitor C0. The main switch S1 and the input voltage source are serially connected in a primary winding circuit of the main transformer, the synchronous rectifier S2 and the output load R0 are connected in a secondary winding circuit of the main transformer, and the capacitor C0 is used for filtering an output circuit. The flyback DC-DC converter is characterized in that a driving circuit is connected between an input end of the synchronous rectifier S2 and an output end of the secondary winding circuit of the main transformer. Since the driving circuit formed by a control transformer is connected into the converter, loss caused by cross conduction can be eliminated, and the driving circuit is simple and low in cost.
Description
Technical field
The present invention relates to a kind of dc-dc, particularly relate to a kind of a kind of magnetic flux utilizing the element such as inductance and electric capacity to complete voltage conversion function as energy-storage travelling wave tube and offset formula high-efficiency flyback dc-dc.
Background technology
Dc-dc minimum system by only having a switch, a transformer, a diode and two electric capacity (one input port and second at output port) composition.The transducer of low output voltage, the conduction loss of rectifier diode forward voltage drop becomes to take loss as the leading factor, is thisly lost in the total-power loss that can reach 50% in some cases; The technology of existing inverse-excitation type dc-dc is: replace synchronous rectification diode with the MOSFET with low conducting resistance, and can control by anti-phase primary control signal the normal running being used as synchronous rectification MOSFET flyback converter; Fig. 1 is the general principle figure of known inverse-excitation type dc-dc, an input voltage source provides transformer and a main switch S1 of two armature windings be connected in series 1, the control signal Vc(S1 of main switch S1) there is a variable duty ratio cycle, to guarantee that stable output voltage is constant frequency control signal, concerning output circuit, an alternating polarity voltage is provided by main transformer 2 secondary winding 3, in the shutoff cycle of the switch of main switch S1, synchronous rectifier S2 coupling output circuit comprises a load R0 and filtering capacitor C0; Synchronous rectifier S2 receives the control signal Vc(S2 by an inverter 4).Its shortcoming is: under this inverse-excitation type dc-dc is operated in CCM, DCM or critical conduction mode, all unavoidably there is the loss that in power loss in main switch S1 and synchronous rectifier S2 cross-conduction process or synchronous rectifier S2, diode reverse recovery causes.
The patent of invention zero-voltage switch flyback conversion equipment of Zhejiang University's application, comprise a circuit of reversed excitation, circuit of reversed excitation is provided with a clamp circuit, clamp circuit comprises an auxiliary switch, an electric capacity and a booster diode, auxiliary switch auxiliary switch in parallel with booster diode and capacitances in series form auxiliary branch, auxiliary branch is connected in parallel on the transformer primary side winding two ends of circuit of reversed excitation or is connected in parallel on former limit switch ends, former limit switch and auxiliary switch are not complementary duty, auxiliary switch is conducting a period of time before the switch conduction of former limit only, when former limit switch conduction, the voltage that former limit switch bears is close to zero.This invention has certain limitation, mainly reduces the loss of power of main switch, can not realize reducing MOSFET diode closed, disconnect time loss, therefore its inverse-excitation type dc-dc is only under the condition of unloaded or underloading, could realize high efficiency output.
Summary of the invention
The object of the invention is for above-mentioned deficiency, and a kind of of proposition can eliminate the loss caused by cross-conduction and Reverse recovery, improve the high-efficiency flyback dc-dc of dc-dc efficiency.
Technical solution of the present invention is: inverse-excitation type dc-dc comprises main transformer, be connected to the main switch S1 be connected in series in main transformer armature winding loop and input voltage source, be connected to the synchronous rectifier S2 in main transformer secondary winding loop and output loading R0 and the electric capacity C0 for output circuit filtering, it is characterized in that: be provided with an auxiliary secondary winding in the secondary side of main transformer, between an input and an output of auxiliary secondary winding of synchronous rectifier S2, be connected with a drive circuit.
Drive circuit described in technical solution of the present invention comprises a control transformer, the control secondary winding of this control transformer is connected with the output of main transformer auxiliary secondary winding by a totem pole configuration circuit, control the input of another termination synchronous rectifier S2 of secondary winding, the control armature winding of control transformer is connected with a RC differential circuit.
Totem pole configuration circuit described in technical solution of the present invention is connected in series by two triodes and forms.
Control armature winding described in technical solution of the present invention and control secondary winding are wrapped on the outer magnetic flux path of E+I type core assembly of control transformer respectively, and the main winding of control transformer is wrapped in control transformer center leg.
The present invention adopts a control transformer to separate from main transformer, on control transformer again access control armature winding and control secondary winding; In this way, as long as control armature winding and control secondary winding, under driving magnetic field is not strong situation too, the primary magnetic field that driving magnetic field can not disturb main transformer to produce, result be control secondary winding electric current only and control the current related of armature winding; The present invention can not only realize eliminating or the basic loss eliminated cross-conduction and cause, and drive circuit of the present invention is simple, and cost is low.
Accompanying drawing explanation
Fig. 1 is the electrical schematic diagram of prior art.
Fig. 2 is electrical schematic diagram of the present invention.
Embodiment
As shown in Figure 2, the armature winding 1 of main transformer 2 is connected with input power Vin by main switch S1, the output of main transformer 2 secondary winding 3 is coupled with a load R0 and filtering capacitor C 0 parallel circuits by synchronous rectifier S2, be provided with an auxiliary secondary winding 14 in the secondary side of main transformer 2, between an input and an output of auxiliary secondary winding 14 of synchronous rectifier S2, be connected with a drive circuit, this drive circuit is the control transformer separated from main transformer 2, and this control transformer can be that a discrete transformer or a flat surface transformer embed on a printed circuit, the control secondary winding 16 of this control transformer is connected with the output of main transformer 2 auxiliary secondary winding 14 by a totem pole configuration circuit, totem pole configuration circuit is by two triodes 11 be connected in series, 12 are formed, triode 11 is NPN transistor, triode 12 is PNP transistor, by totem pole configuration circuit for synchronous rectifier S2 provides control signal, two triodes 11, the base stage of 12 connects one end that control transformer controls secondary winding 16, control transformer controls the input of another termination synchronous rectifier S2 of secondary winding 16, the DC offset voltage of this totem pole configuration circuit is provided by the auxiliary winding 14 that main transformer 2 secondary side increases, this auxiliary winding 14 is connected with the collector electrode of triode 11 by rectifier diode 13, the grounded collector of triode 12.By this type of drive, the opening and closing being carried out control synchronization rectifier S2 by main switch S1 control signal can be ensured, thus eliminate or substantially eliminate the loss caused by main switch S1 and synchronous rectifier S2 cross-conduction, improve dc-dc efficiency; The signal source 17 of main switch S1 control signal in main transformer 2 primary return, is connected on the armature winding 15 of control transformer by a RC differential circuit.
The control armature winding 15 of the control transformer in the present invention is wrapped in the outer magnetic flux path 5 of E+I shaped iron core, on 7, the main winding 8 of control transformer is wrapped in the center leg 6 of control transformer, the control secondary winding 16 of control transformer is wrapped in E+I type core assembly 9 equally, the outer magnetic flux path 5 of 10, on 7.Control secondary winding 16 and be wound onto outer magnetic flux path 5,7, make magnetic flux be delivered to outside magnetic flux path from central leg 6, thus basic no current on control secondary winding 16 is flow through; In Fig. 2, control armature winding 15 to be wound around in an identical manner, make magnetic flux path 5 outside, the magnetic flux that 7 magnetic fluxs produced and center leg 6 produce is cancelled out each other, in this way, as long as the driving magnetic field controlling armature winding 15 and control secondary winding 16 is not too strong, the primary magnetic field that driving magnetic field can not disturb control transformer to produce, result be control secondary winding 16 electric current only and control armature winding 15 current related; Control secondary winding 16 and produce the input of output signal as a totem pole configuration circuit, and provide control signal to synchronous rectifier S2.
Claims (4)
1. a magnetic flux offsets formula high-efficiency flyback dc-dc, comprise main transformer (2), be connected to the main switch S1 be connected in series in main transformer (2) armature winding (1) loop and input voltage source, be connected to the synchronous rectifier S2 in main transformer (2) secondary winding (3) loop and output loading R0 and the electric capacity C0 for output circuit filtering, it is characterized in that: be provided with an auxiliary secondary winding (14) in the secondary side of main transformer (2), a drive circuit is connected with between an input and an output of auxiliary secondary winding 14 of synchronous rectifier S2.
2. a kind of magnetic flux according to claim 1 offsets formula high-efficiency flyback dc-dc, it is characterized in that: described drive circuit comprises a control transformer, the control secondary winding (16) of this control transformer is connected by the output of a totem pole configuration circuit with main transformer (2) auxiliary secondary winding (14), control the input of another termination synchronous rectifier S2 of secondary winding (16), the control armature winding (15) of control transformer is connected with a RC differential circuit.
3. a kind of magnetic flux according to claim 2 offsets formula high-efficiency flyback dc-dc, it is characterized in that: described totem pole configuration circuit is connected in series by two pipe triodes (11,12) and forms.
4. a kind of magnetic flux according to claim 2 offsets formula high-efficiency flyback dc-dc, it is characterized in that: described control armature winding (15) and control secondary winding (16) are wrapped in the E+I shaped iron core (9 of control transformer respectively, 10) outer magnetic flux path (5,7), on, the main winding (8) of control transformer is wrapped in control transformer center leg (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410102108.1A CN104638926A (en) | 2014-03-19 | 2014-03-19 | Magnetic flux offset type high-efficiency flyback DC-DC (direct current-direct current) converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410102108.1A CN104638926A (en) | 2014-03-19 | 2014-03-19 | Magnetic flux offset type high-efficiency flyback DC-DC (direct current-direct current) converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104638926A true CN104638926A (en) | 2015-05-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410102108.1A Pending CN104638926A (en) | 2014-03-19 | 2014-03-19 | Magnetic flux offset type high-efficiency flyback DC-DC (direct current-direct current) converter |
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| CN (1) | CN104638926A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106452089A (en) * | 2016-11-21 | 2017-02-22 | 盐城工学院 | Flyback converter having characteristics of constant-frequency working and high current critical continuity |
| CN106487234A (en) * | 2016-11-21 | 2017-03-08 | 盐城工学院 | The output power control method of the anti exciting converter of electric current blend modes of operation |
Citations (6)
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|---|---|---|---|---|
| CN1256550A (en) * | 1999-12-30 | 2000-06-14 | 深圳市华为电气股份有限公司 | Self-driving circuit of DC/DC converter |
| US6256214B1 (en) * | 1999-03-11 | 2001-07-03 | Ericsson Inc. | General self-driven synchronous rectification scheme for synchronous rectifiers having a floating gate |
| CN2519527Y (en) * | 2001-11-27 | 2002-10-30 | 台湾光宝电子股份有限公司 | Reverse exciting type transducer output synchronous rectifier |
| CN1521927A (en) * | 2003-01-31 | 2004-08-18 | 微星科技股份有限公司 | Magnetic energy driver for step-down type synchronous rectification circuit |
| CN101471609A (en) * | 2007-12-28 | 2009-07-01 | 尼克森微电子股份有限公司 | Tri-terminal integration synchronous rectifier and inverse-excitation type synchronous rectifying circuit |
| CN203747658U (en) * | 2014-03-19 | 2014-07-30 | 襄阳南车电气***技术有限公司 | Magnetic flux cancellation type high-efficiency flyback DC-DC converter |
-
2014
- 2014-03-19 CN CN201410102108.1A patent/CN104638926A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6256214B1 (en) * | 1999-03-11 | 2001-07-03 | Ericsson Inc. | General self-driven synchronous rectification scheme for synchronous rectifiers having a floating gate |
| CN1256550A (en) * | 1999-12-30 | 2000-06-14 | 深圳市华为电气股份有限公司 | Self-driving circuit of DC/DC converter |
| CN2519527Y (en) * | 2001-11-27 | 2002-10-30 | 台湾光宝电子股份有限公司 | Reverse exciting type transducer output synchronous rectifier |
| CN1521927A (en) * | 2003-01-31 | 2004-08-18 | 微星科技股份有限公司 | Magnetic energy driver for step-down type synchronous rectification circuit |
| CN101471609A (en) * | 2007-12-28 | 2009-07-01 | 尼克森微电子股份有限公司 | Tri-terminal integration synchronous rectifier and inverse-excitation type synchronous rectifying circuit |
| CN203747658U (en) * | 2014-03-19 | 2014-07-30 | 襄阳南车电气***技术有限公司 | Magnetic flux cancellation type high-efficiency flyback DC-DC converter |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106452089A (en) * | 2016-11-21 | 2017-02-22 | 盐城工学院 | Flyback converter having characteristics of constant-frequency working and high current critical continuity |
| CN106487234A (en) * | 2016-11-21 | 2017-03-08 | 盐城工学院 | The output power control method of the anti exciting converter of electric current blend modes of operation |
| CN106452089B (en) * | 2016-11-21 | 2019-03-08 | 盐城工学院 | A kind of flyback converter of constant frequency work+electric current critical continuous mode |
| CN106487234B (en) * | 2016-11-21 | 2019-03-08 | 盐城工学院 | The output power control method of the flyback converter of electric current blend modes of operation |
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| ASS | Succession or assignment of patent right |
Owner name: XIANGYANG CSR ELECTRIC MACHINERY CO., LTD. Free format text: FORMER OWNER: XIANGYANG CSR ELECTRICAL SYSTEM TECHNOLOGY CO., LTD. Effective date: 20150515 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20150515 Address after: 441047 Xiangfan North Road, Hubei, No. 132 Changhong Applicant after: Xiangyang CSR Electric Machinery Co., Ltd. Address before: 441047 No. 359 mountain road, hi tech Development Zone, Hubei, Xiangfan Applicant before: XIANGYANG CSR ELECTRICAL SYSTEM TECHNOLOGY CO., LTD. |
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| C10 | Entry into substantive examination | ||
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| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150520 |