CN107086794A - A kind of full isolated DC high current circuit of synchronous rectification - Google Patents
A kind of full isolated DC high current circuit of synchronous rectification Download PDFInfo
- Publication number
- CN107086794A CN107086794A CN201710495494.9A CN201710495494A CN107086794A CN 107086794 A CN107086794 A CN 107086794A CN 201710495494 A CN201710495494 A CN 201710495494A CN 107086794 A CN107086794 A CN 107086794A
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- current circuit
- high current
- synchronous rectification
- grid
- mosfet
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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
-
- 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)
- Rectifiers (AREA)
Abstract
The invention belongs to electronic technology field, and in particular to a kind of full isolated DC high current circuit of synchronous rectification.The full isolated DC high current circuit of synchronous rectification, including high frequency transformer L5, high frequency transformer L5 termination R2 one end, C6 one end, D5 negative pole, VT3 drain electrode；L5 another termination R3 one end, C7 one end, D6 negative pole, VT4 drain electrode；R2 other end VT4 grid；R3 another termination VT3 grid；L5 centre cap connects C8 positive pole and load FZ one end；D5 positive pole, the C6 other end, VT3 source electrode and substrate and D6 positive pole, the C7 other end, VT4 source electrode and substrate and C8 negative pole, the other end that loads FZ link together.Its advantage is：The rectifier loss of switched power output is greatly reduced, power supply conversion efficiency is improved, the heating of power supply in itself is reduced.
Description
Technical field
The invention belongs to electronic technology field, and in particular to a kind of full isolated DC high current circuit of synchronous rectification.
Background technology
With the actual requirement developed rapidly with energy-saving and environment friendly of electronic technology so that the supporting power supply of electronic circuit
Operating voltage is more and more lower, working frequency more and more higher, electric current are increasing, and low voltage operating advantageously reduces the entirety of circuit
Power consumption.The loss of Switching Power Supply is mainly made up of three parts：The loss of power switch pipe, the loss of high frequency transformer is defeated
Go out to hold the loss of rectifying tube.In the case of low-voltage, High-current output, the loss of output end rectifying tube is especially prominent, fast extensive
The pressure drop of diode or Ultrafast recovery diode is answered up to 0.7 V~1.2V, even if using the Schottky diode of low pressure drop,
About 0.4V~0.5V pressure drop can be produced, this results in rectifier loss increase, heating seriously, power-efficient reduction.Illustrate
Bright, notebook computer generally uses 3.3V, 1.8V or 1.5V supply voltage, and the electric current consumed is up to 20A.It is now ultrafast extensive
The rectifier loss of multiple diode is close to the 40%~50% of output power of power supply, even if using Schottky diode, on rectifying tube
Loss can also reach 20%~30%.Therefore, traditional diode rectifier circuit can not have been met realizes that low-voltage, high current are opened
The need for closing high efficiency of power supply, low-temperature-rise, the bottleneck as restriction high frequency switch power AC/DC conversion efficiencys.
The content of the invention
There is provided a kind of full isolated DC high current circuit of synchronous rectification for the defect that makes up prior art by the present invention.
The present invention is achieved through the following technical solutions：
A kind of full isolated DC high current circuit of synchronous rectification, including high frequency transformer L5, one end of the high frequency transformer L5
Connect R2 one end, C6 one end, D5 negative pole, VT3 drain electrode；L5 another termination R3 one end, C7 one end, D6 it is negative
Pole, VT4 drain electrode；R2 other end VT4 grid；R3 another termination VT3 grid；L5 centre cap connects C8 positive pole
With load FZ one end；D5 positive pole, the C6 other end, VT3 source electrode and substrate and D6 positive pole, the C7 other end, VT4
Negative pole, the load FZ other end of source electrode and substrate and C8 link together.
Further, the VT3 and VT4 are MOSFET synchronous rectifiers, and D5 and D6 are that to be connected in parallel on VT3 and VT4 MOSFET same
Walk the Schottky diode on the body diode of rectifying tube.
Further, the R2 is VT4 grid divider resistance, and R3 is VT3 grid divider resistance, and C6 is VT3 source-leakage
Electric capacity is protected, C7 is VT4 source-leakage protection electric capacity, and C8 is filter capacitor, and FZ is load.
Further, described R2, R3 are respectively 10 Ω -1K Ω resistance, and C6, C7 are respectively 1nF-220 nF electric capacity.
Further, described D5, D6 are respectively MBR40100 Schottky diodes, and VT3 and VT4 are 30A/100V
The N-channel MOS FET high-power FETs such as 2SK3708 or FDB86102LZ, C8 is 470 μ F -6800 μ F filter capacitor.
The beneficial effects of the invention are as follows：A kind of full isolated DC high current circuit of synchronous rectification low on-resistance of the present invention
MOSFET replaces existing conventional Schottky diode rectification or afterflow, is particularly suitable for output low-voltage, the rectification square of high current
Case, that is, rectifying tube after high frequency transformer is exported are changed to the MOSFET of low conducting internal resistance, and design corresponding driving,
Protection circuit stabilizes it, reliably worked, and can greatly reduce power attenuation during output rectification, improves AC/DC conversion effects
Rate, the secondary symmetrical coiling of high frequency transformer and centre cap, composition half-bridge full-wave rectifying circuit are also reduction rectification power consumption, improved
Property, realize high efficiency, and two MOSFET with the secondary output generating positive and negative voltage of high frequency transformer turn-on and turn-off,
The function of MOSFET synchronous rectifications is realized, is filtered through C8, it is defeated that load FZ can obtain stable DC low-voltage, high current
Go out, greatly reduce the rectifier loss of switched power output, improve power supply conversion efficiency, reduce the hair of power supply in itself
Heat.
Brief description of the drawings
The present invention is further illustrated below in conjunction with the accompanying drawings.
Accompanying drawing 1 is circuit theory schematic diagram of the invention.
Embodiment
Accompanying drawing 1 is a kind of specific embodiment of the invention.A kind of full isolated DC high current circuit of synchronous rectification of the invention,
Including high frequency transformer L5, a termination R2 of high frequency transformer L5 one end, C6 one end, D5 negative pole, VT3 leakage
Pole；L5 another termination R3 one end, C7 one end, D6 negative pole, VT4 drain electrode；R2 other end VT4 grid；R3's
Another termination VT3 grid；L5 centre cap connects C8 positive pole and load FZ one end；D5 positive pole, the C6 other end,
VT3 source electrode and substrate and D6 positive pole, the C7 other end, VT4 source electrode and substrate and C8 negative pole, load FZ it is another
End links together.
Further, the VT3 and VT4 are MOSFET synchronous rectifiers, and D5 and D6 are to be connected in parallel on VT3 and VT4MOSFET is same
Walk the Schottky diode on the body diode of rectifying tube.
Further, the R2 is VT4 grid divider resistance, and R3 is VT3 grid divider resistance, and C6 is VT3 source-leakage
Electric capacity is protected, C7 is VT4 source-leakage protection electric capacity, and C8 is filter capacitor, and FZ is load.
Further, described R2, R3 are respectively 10 Ω -1K Ω resistance, and C6, C7 are respectively 1nF-220 nF electric capacity.
Further, described D5, D6 are respectively MBR40100 Schottky diodes, and VT3 and VT4 are 30A/100V
The N-channel MOS FET high-power FETs such as 2SK3708 or FDB86102LZ, C8 is 470 μ F -6800 μ F filter capacitor.
A kind of full isolated DC high current circuit of synchronous rectification of the invention, VT3 and VT4 are MOSFET synchronous rectifications when using
Pipe, D5 and D6 are the Schottky diodes being connected in parallel on the body diode of VT3 and VT4 MOSFET synchronous rectifiers, and R2 is VT4
Grid divider resistance, R3 is VT3 grid divider resistance, and C6 is VT3 source-leakage protection electric capacity, and source-leakage that C7 is VT4 is protected
Electric capacity is protected, C8 is filter capacitor, and FZ is load.The course of work is：VT1, VT2 of preceding stage high frequency Switching Power Supply are a switch week
Alternating, complementary conducting, cut-off in phase, high frequency voltage are sensed to symmetrical coiling and centre cap by the L4 windings of high frequency transformer
L5 windings, output high-frequency voltage signal direct drive MOSFET synchronous rectifiers, when the secondary L5 windings of high frequency transformer
Output is in positive half cycle, and output cathode voltage adds VT4 grid, VT4 conductings, VT3 shut-offs through R2；Time of high frequency transformer
Level L5 winding outputs are in negative half period, and output cathode voltage adds VT3 grid, VT3 conductings, VT4 shut-offs, two through R3
MOSFET turn-on and turn-off with the secondary L5 windings output generating positive and negative voltage of high frequency transformer, realize MOSFET synchronous rectifications
Function, filtered through C8, load FZ can obtain stable DC low-voltage, High-current output.
Full isolated DC high current circuit of synchronous rectification, the existing pole of conventional Schottky two is replaced with low on-resistance MOSFET
Pipe rectification or afterflow, are particularly suitable for output low-voltage, the rectification scheme of high current, that is, after high frequency transformer is exported
Rectifying tube be changed to the MOSFET of low conducting internal resistance, and design corresponding driving, protection circuit and stabilize it, reliably work,
Power attenuation during output rectification can be greatly reduced, AC/DC conversion efficiencys are improved, in the secondary symmetrical coiling simultaneously of high frequency transformer
Heart tap, composition half-bridge full-wave rectifying circuit is also reduction rectification power consumption, improve property, to realize efficient one important
Aspect.Power MOSFET belongs to voltage-controlled device, it conducting when C-V characteristic it is linear, use power MOSFET
When making rectifier, it is desirable to which phase holding that grid voltage must be with being rectified voltage is synchronous could to complete rectification function,
When MOSFET replaces existing Conventional Schottky rectification control secondary end rectifier, the control of MOSFET turn-on and turn-off is very
It is crucial, especially during shut-off, to determine the region of MOSFET conductings, control MOSFET turn-on and turn-off when
Between, the corresponding driving of design, protection circuit stabilize it, reliably worked.VT3 and VT4 are MOSFET synchronous rectifiers, D5 and
D6 is the Schottky diode being connected in parallel on the body diode of VT3 and VT4MOSFET synchronous rectifiers, and R2 is VT4 grid point
Piezoresistance, R3 is VT3 grid divider resistance, and C6 is VT3 source-leakage protection electric capacity, and electric capacity, C8 are protected in source-leakage that C7 is VT4
It is filter capacitor, FZ is load.The course of work is：VT1, VT2 of preceding stage high frequency Switching Power Supply replace in a switch periods
Complementation conducting, cut-off, high frequency voltage are sensed to symmetrical coiling and centre tapped L5 windings by the L4 windings of high frequency transformer,
The voltage signal directly drives MOSFET synchronous rectifiers, defeated when the secondary L5 windings of high frequency transformer are exported in positive half cycle
Go out the grid that positive polarity voltage adds VT4 through R2, VT4 conductings, VT3 shut-offs；The secondary L5 windings output of high frequency transformer is negative
During half cycle, output cathode voltage adds VT3 grid through R3, and VT3 conductings, VT4 are turned off, and two MOSFET are with high frequency transformation
The secondary output generating positive and negative voltage of device and turn-on and turn-off, realize the function of MOSFET synchronous rectifications, are filtered through C8, load FZ can
To obtain stable DC low-voltage, High-current output, the rectifier loss of switched power output is greatly reduced, electricity is improved
Source conversion efficiency, reduces the heating of power supply in itself.
The present invention is not limited to the above-described embodiments, and anyone should learn that is made under the enlightenment of the present invention has with the present invention
Same or like technical scheme, each falls within protection scope of the present invention.
The technology of the invention not being described in detail, shape, construction part are known technology.
Claims (5)
1. a kind of full isolated DC high current circuit of synchronous rectification, including high frequency transformer L5, it is characterised in that the high frequency becomes
Depressor L5 termination R2 one end, C6 one end, D5 negative pole, VT3 drain electrode；L5 another termination R3 one end, C7
One end, D6 negative pole, VT4 drain electrode；R2 other end VT4 grid；R3 another termination VT3 grid；Take out at L5 center
Head connects C8 positive pole and load FZ one end；D5 positive pole, the C6 other end, VT3 source electrode and substrate and D6 positive pole, C7
The other end, the negative pole of VT4 source electrode and substrate and C8, the load FZ other end link together.
2. a kind of full isolated DC high current circuit of synchronous rectification according to claim 1, it is characterized in that：The VT3 and
VT4 is MOSFET synchronous rectifiers, and D5 and D6 are Xiao being connected in parallel on the body diode of VT3 and VT4 MOSFET synchronous rectifiers
Special based diode.
3. a kind of full isolated DC high current circuit of synchronous rectification according to claim 1, it is characterized in that：The R2 is
VT4 grid divider resistance, R3 is VT3 grid divider resistance, and C6 is VT3 source-leakage protection electric capacity, and C7 is VT4 source-leakage
Electric capacity is protected, C8 is filter capacitor, and FZ is load.
4. a kind of full isolated DC high current circuit of synchronous rectification according to claim 1 or 3, it is characterized in that：The R2,
R3 is respectively 10 Ω -1K Ω resistance, and C6, C7 are respectively 1nF-220 nF electric capacity.
5. a kind of full isolated DC high current circuit of synchronous rectification according to claim 1 or 2, it is characterized in that：It is described
D5, D6 are respectively MBR40100 Schottky diodes, and VT3 and VT4 are the N ditches such as 30A/100V 2SK3708 or FDB86102LZ
Road MOSFET high-power FETs, C8 is 470 μ F -6800 μ F filter capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710495494.9A CN107086794A (en) | 2017-06-26 | 2017-06-26 | A kind of full isolated DC high current circuit of synchronous rectification |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710495494.9A CN107086794A (en) | 2017-06-26 | 2017-06-26 | A kind of full isolated DC high current circuit of synchronous rectification |
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| Publication Number | Publication Date |
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| CN107086794A true CN107086794A (en) | 2017-08-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710495494.9A Withdrawn CN107086794A (en) | 2017-06-26 | 2017-06-26 | A kind of full isolated DC high current circuit of synchronous rectification |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109617415A (en) * | 2018-12-07 | 2019-04-12 | 广州金升阳科技有限公司 | A kind of signal-isolated transmission circuit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102142776A (en) * | 2010-01-29 | 2011-08-03 | 株式会社村田制作所 | Switching power-supply apparatus |
| CN205453506U (en) * | 2016-03-25 | 2016-08-10 | 成都大奇鹰科技有限公司 | Output synchronous Rectifier's push -pull circuit |
-
2017
- 2017-06-26 CN CN201710495494.9A patent/CN107086794A/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102142776A (en) * | 2010-01-29 | 2011-08-03 | 株式会社村田制作所 | Switching power-supply apparatus |
| CN205453506U (en) * | 2016-03-25 | 2016-08-10 | 成都大奇鹰科技有限公司 | Output synchronous Rectifier's push -pull circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109617415A (en) * | 2018-12-07 | 2019-04-12 | 广州金升阳科技有限公司 | A kind of signal-isolated transmission circuit |
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20170822 |
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| WW01 | Invention patent application withdrawn after publication |