CN203747658U - Magnetic flux cancellation type high-efficiency flyback DC-DC converter - Google Patents
Magnetic flux cancellation type high-efficiency flyback DC-DC converter Download PDFInfo
- Publication number
- CN203747658U CN203747658U CN201420124361.2U CN201420124361U CN203747658U CN 203747658 U CN203747658 U CN 203747658U CN 201420124361 U CN201420124361 U CN 201420124361U CN 203747658 U CN203747658 U CN 203747658U
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- transformer
- control
- secondary winding
- converter
- flyback
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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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- Dc-Dc Converters (AREA)
Abstract
The utility model relates to a flyback DC-DC converter, in particular, a magnetic flux cancellation type high-efficiency flyback DC-DC converter. The objective of the magnetic flux cancellation type high-efficiency flyback DC-DC converter is mainly to solve the problem of power loss in the cross conduction process of a main switch and a synchronous rectifier or the problem of loss which is caused by reverse recovery of a diode in the synchronous rectifier of an existing flyback converter. The flyback DC-DC converter of the utility model comprises a main transformer, a main switch S1 and an input voltage source which are in series connection and are connected in the loop of the primary winding of the main transformer, a synchronous rectifier S2 and an output load R0 which are connected in the loop of the secondary winding of the main transformer, and a capacitor C0 which is used for filtering an output circuit. The flyback DC-DC converter is characterized in that a driving circuit is connected between one input end of the synchronous rectifier S2 and one output end of the secondary winding of the main transformer. According to the flyback DC-DC converter of the utility model, the driving circuit composed of a control transformer is connected in the converter, and therefore, loss caused by cross conduction can be eliminated, and the driving circuit simple and is low in cost.
Description
Technical field
The utility model relates to a kind of DC-DC transducer, and concrete a kind of a kind of magnetic flux that utilizes the element such as inductance and electric capacity to complete voltage conversion function as energy-storage travelling wave tube that relates to offsets formula high-efficiency flyback DC-DC transducer.
Background technology
DC-DC transducer minimum system is by only having a switch, a transformer, 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, and this loss can reach 50% total-power loss in some cases; The technology of existing inverse-excitation type DC-DC transducer is: with the MOSFET replacement synchronous rectification diode with low conducting resistance, and can control the normal running as synchronous rectification MOSFET flyback converter by anti-phase primary control signal; Fig. 1 is the general principle figure of known inverse-excitation type DC-DC transducer, an input voltage source provides transformer and a main switch S1 of two armature windings that are 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, provide an alternating polarity voltage 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 by the control signal Vc(S2 of an inverter 4).Its shortcoming is: this inverse-excitation type DC-DC transducer is operated under CCM, DCM or critical conduction mode, all unavoidably has 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 composition 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 work, auxiliary switch is conducting a period of time before the switch conduction of former limit only, in the time of the switch conduction of former limit, the voltage that former limit switch bears is close to zero.This invention has certain limitation, is mainly to reduce the loss of power of main switch, can not realize and reduce MOSFET diode in loss closed, while disconnecting, therefore its inverse-excitation type DC-DC transducer only under the condition of zero load or underloading, could be realized high efficiency output.
Summary of the invention
The purpose of this utility model is for above-mentioned deficiency, and a kind of can the elimination by cross-conduction and the loss that oppositely recovers to cause proposing, the high-efficiency flyback DC-DC transducer of raising DC-DC converter efficiency.
Technical solution of the present utility model is: inverse-excitation type DC-DC transducer comprises main transformer, be connected to the main switch S1 and the input voltage source that are connected in series in main transformer armature winding loop, be connected to synchronous rectifier S2 in main transformer secondary winding loop and output loading R0 and the capacitor C 0 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 of synchronous rectifier S2 and an output of auxiliary secondary winding, be connected with a drive circuit.
Drive circuit described in technical solution of the present utility model comprises a control transformer, the control secondary winding of this control transformer is connected with the output of the auxiliary secondary winding of main transformer by a totem structural circuit, the input of controlling another termination synchronous rectifier S2 of secondary winding, the control armature winding of control transformer is connected with a RC differential circuit.
Totem structural circuit described in technical solution of the present utility model is connected in series and is formed by two triodes.
Control armature winding described in technical solution of the present utility model and control secondary winding are wrapped in respectively on the outer magnetic flux path of E+I type core assembly of control transformer, and the main winding of control transformer is wrapped in control transformer center leg.
The utility model adopt a control transformer 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, in strong situation too at driving magnetic field, the main 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 utility model can not only be realized and eliminates or substantially eliminate the loss that cross-conduction causes, and the utility model drive circuit is simple, and cost is low.
Brief description of the drawings
Fig. 1 is the electrical schematic diagram of prior art.
Fig. 2 is electrical schematic diagram of the present utility model.
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 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 input of synchronous rectifier S2 and an output of auxiliary secondary winding 14, be connected with a drive circuit, this drive circuit is a control transformer of separating from main transformer 2, and this control transformer can be that a discrete transformer or a flat surface transformer are embedded on printed circuit board (PCB), 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 structural circuit, totem structural circuit is by two triodes 11 that are connected in series, 12 form, triode 11 is NPN transistor, triode 12 is PNP transistors, provide control signal by totem structural circuit for synchronous rectifier S2, two triodes 11, 12 base stage connects one end of control transformer control secondary winding 16, the input of another termination synchronous rectifier S2 of control transformer control secondary winding 16, the DC offset voltage of this totem structural circuit is provided by the auxiliary winding 14 increasing in main transformer 2 secondary side, 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, can ensure to be controlled by main switch S1 control signal the opening and closing of synchronous rectifier S2, thereby eliminate or the basic loss being caused by main switch S1 and synchronous rectifier S2 cross-conduction, the raising DC-DC converter efficiency eliminated; The signal source 17 of main switch S1 control signal in main transformer 2 primary returns, is connected on by a RC differential circuit on the armature winding 15 of control transformer.
The control armature winding 15 of the control transformer in the utility model 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, on 10 outer magnetic flux path 5,7.Control secondary winding 16 and be wound onto outer magnetic flux path 5,7, make magnetic flux be delivered to external magnetic path from central leg 6, flow through thereby make to control basic no current on secondary winding 16; In Fig. 2, controlling armature winding 15 is wound around in an identical manner, make magnetic flux path 5 outside, the magnetic flux that 7 magnetic fluxs that produce and center leg 6 produce is cancelled out each other, in this way, as long as the driving magnetic field of controlling armature winding 15 and controlling secondary winding 16 is not too strong, the main magnetic field that driving magnetic field can not disturb control transformer to produce, result be control secondary winding 16 electric current only and control the current related of armature winding 15; Control secondary winding 16 and produce the input of output signal as a totem structural circuit, and control signal is provided to synchronous rectifier S2.
Claims (4)
1. a magnetic flux offsets formula high-efficiency flyback DC-DC transducer, comprise main transformer (2), be connected to the main switch S1 and the input voltage source that are connected in series in main transformer (2) armature winding (1) loop, be connected to synchronous rectifier S2 in main transformer (2) secondary winding (3) loop and output loading R0 and the capacitor C 0 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), between an input of synchronous rectifier S2 and an output of auxiliary secondary winding (14), be connected with a drive circuit.
2. a kind of magnetic flux according to claim 1 offsets formula high-efficiency flyback DC-DC transducer, it is characterized in that: described drive circuit comprises a control transformer, the control secondary winding (16) of this control transformer is connected with the output of the auxiliary secondary winding (14) of main transformer (2) by a totem structural circuit, the input of controlling 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 transducer, it is characterized in that: described totem structural circuit is connected in series formation by two pipe triodes (11,12).
4. a kind of magnetic flux according to claim 2 offsets formula high-efficiency flyback DC-DC transducer, it is characterized in that: described control armature winding (15) and control secondary winding (16) are wrapped in respectively the E+I shaped iron core (9 of control transformer, 10) outer magnetic flux path (5,7) upper, 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 |
|---|---|---|---|
| CN201420124361.2U CN203747658U (en) | 2014-03-19 | 2014-03-19 | Magnetic flux cancellation type high-efficiency flyback DC-DC converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420124361.2U CN203747658U (en) | 2014-03-19 | 2014-03-19 | Magnetic flux cancellation type high-efficiency flyback DC-DC converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203747658U true CN203747658U (en) | 2014-07-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420124361.2U Expired - Fee Related CN203747658U (en) | 2014-03-19 | 2014-03-19 | Magnetic flux cancellation type high-efficiency flyback DC-DC converter |
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| Country | Link |
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| CN (1) | CN203747658U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104638926A (en) * | 2014-03-19 | 2015-05-20 | 襄阳南车电气系统技术有限公司 | Magnetic flux offset type high-efficiency flyback DC-DC (direct current-direct current) converter |
-
2014
- 2014-03-19 CN CN201420124361.2U patent/CN203747658U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104638926A (en) * | 2014-03-19 | 2015-05-20 | 襄阳南车电气系统技术有限公司 | Magnetic flux offset type high-efficiency flyback DC-DC (direct current-direct current) converter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| 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: 20150514 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20150514 Address after: 441047 Xiangfan North Road, Hubei, No. 132 Changhong Patentee after: Xiangyang CSR Electric Machinery Co., Ltd. Address before: 441047 No. 359 mountain road, hi tech Development Zone, Hubei, Xiangfan Patentee before: XIANGYANG CSR ELECTRICAL SYSTEM TECHNOLOGY CO., LTD. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140730 Termination date: 20170319 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |