CN104601016B - Method for reducing loss of synchronous rectification drive circuit based on coupling coil - Google Patents
Method for reducing loss of synchronous rectification drive circuit based on coupling coil Download PDFInfo
- Publication number
- CN104601016B CN104601016B CN201510017139.1A CN201510017139A CN104601016B CN 104601016 B CN104601016 B CN 104601016B CN 201510017139 A CN201510017139 A CN 201510017139A CN 104601016 B CN104601016 B CN 104601016B
- Authority
- CN
- China
- Prior art keywords
- current
- synchronous rectification
- current transformer
- diode
- driving circuit
- 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.)
- Expired - Fee Related
Links
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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- 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
Abstract
The invention discloses a method for reducing loss of a synchronous rectification drive circuit based on a coupling coil. The method specifically comprises the steps of establishing the synchronous rectification drive circuit, detecting a rectification branch circuit current signal and using the detected current signal to synchronize a driven opening signal, enabling the secondary side of a current transformer a to be subjected to short circuit by conducting internal circuit adjustment on the after the synchronous rectification drive circuit synchronous rectification drive circuit outputs high lever, adjusting voltage pulse width of the secondary side of the current transformer a to be in an optimal state in a self-adaptive mode with change of the rectification branch circuit current, utilizing the relation between exciting current and the current of the secondary side of the current transformer to turn off a synchronous rectification tube. The method for reducing loss of the synchronous rectification drive circuit based on the coupling coil has the advantages of being low power consumption, good in universality and capable of working in a current interruption or continuous mode.
Description
Technical field
The invention belongs to power circuit application process technical field, it is related to a kind of coupling coil that is based on and reduces synchronous rectification drive
The method of dynamic circuit loss.
Background technology
With the fast development of electronic technology, people become increasingly dependent on to electronic equipment, and people are in trip for convenience
Carry electronic product, occur in that increasing portable type electronic product, such as：Mobile phone and panel computer etc..
Nowadays, the volume of portable type electronic product is less and less, and in order to ensure the safety of electronic product, its power supply is powered
Voltage request is more and more lower, and under certain power, its current requirements is bigger；But the rising of electric current can bring one very tight
High problem is it is simply that because the on-state loss that diode rectification brings leads to greatly the low problem of switch converters efficiency.For this
One problem, the power metal oxide semiconductor field-effect transistor (Mosfet) using low on-resistance to replace diode whole
Stream, i.e. synchronous rectification, improved efficiency is acted on clearly；And adopt low-voltage power metal-oxide-semiconductor field effect
Key technical problem that rectification faces is exactly power MOSFET to answer transistor (Mosfet) to synchronize
The stationary problem that transistor (Mosfet) drives.
Power metal oxide semiconductor field-effect transistor (Mosfet) drives and is broadly divided into self-driven and outer driving two
Type.Wherein, the self-driven type according to synchronized signal source is divided into voltage-type self-driven and current mode is self-driven；Outer drive
It is dynamic that voltage-type is self-driven to be affected by change range of input voltage due to relatively costly, so less employing；Current mode is self-driven to be
A kind of comparatively ideal synchronous rectification drive scheme, but the big problem of synchronous rectification driving circuit loss receives much concern always.
Content of the invention
It is an object of the invention to provide a kind of method that synchronous rectification driving circuit loss is reduced based on coupling coil, tool
Have the characteristics that low in energy consumption, versatility is good and is operable with discontinuous current and continuous mode.
The technical solution adopted in the present invention is：Reduce the side of synchronous rectification driving circuit loss based on coupling coil
Method, specifically implements according to following steps：
Step 1, structure synchronous rectification driving circuit；
Step 2, construct after synchronous rectification driving circuit through step 1, detect rectification branch current signal, with detect
Current signal is synchronously driven to open signal；
Step 3, through step 2 commutation driver circuit to be synchronized output high level after, synchronous rectification driving circuit pass through inside
So that current transformer a secondary short circuit, with the change of rectification branch current, adaptive regulation electric current is mutual for the regulation of circuit
The Voltage Pulse Width of sensor a secondary is to optimum state；
Step 4, through step 3, synchronous rectifier is closed by the relation using exciting current summation current transformer a secondary current
Disconnected.
The feature of the present invention also resides in：
Step 1 is specifically implemented in accordance with the following methods：
One current transformer a is added on rectification branch road, current transformer a carrys out sensed current signal；In Current Mutual Inductance
The secondary of device a connects a switching tube, using switching tube conducting, the principle of secondary short circuit is reduced synchronous rectification driving circuit
Loss；
One current transformer b, one two pole of secondary parallel connection of current transformer b are added on the branch road that switching tube is located again
The two ends of pipe c, a diode c triode a in parallel again；Wherein, the negative electrode of diode c meets the base stage of audion a, diode c
Anode connect the emitter stage of audion a；
Again the secondary A terminal of current transformer a is connected to the anode of diode a；The negative electrode of diode a is coupled with two poles
The colelctor electrode of the anode of pipe b, the input of Mosfet driver and audion a；The negative electrode of diode b is connected to audion b
Emitter stage and Mosfet driver power end；
Be connected in parallel with a capacitor in the power end of Mosfet driver and earth terminal, the emitter stage of audion b and base stage it
Between a resistance R in parallel1, the colelctor electrode of audion b and resistance R3One end connect, resistance R3The other end and switching tube grid
Pole connects；The negative electrode of the base stage of audion b and stabilivolt connects, and the anode of stabilivolt is connected with the earth terminal of Mosfet driver
Connect, the outfan of Mosfet driver and input parallel connection one resistance R2, in the grid of switching tube and Mosfet driver
Output one diode d of termination, the negative electrode of described diode d connects the outfan of Mosfet driver, and the anode of diode d connects out
Close the grid of pipe；
By the B end of current transformer a secondary, the drain electrode of switching tube, the emitter stage of audion a, the anode of stabilivolt,
The earth terminal of Mosfet driver is all connected together and then draws single line as the earth terminal of synchronous rectification drive signal, from
The outfan of Mosfet driver draws single line as the other end of synchronous rectification drive signal.
Mosfet drive model in step 1 is TC1413.
Step 2 is specifically implemented according to following steps：
Step 2.1, construct after synchronous rectification driving circuit through step 1, connect synchronous rectification driving circuit, electric current i1Stream
Cross synchronous rectification Mosfet parasitic diode, that is, flow through the former limit of current transformer a, electricity is induced by current transformer a secondary
Stream i2, electric current i2Respectively flow through diode a, diode b, complete to charge to electric capacity；
Step 2.2, through step 2.1 to electric capacity charging after, treat that Mosfet driver input end voltage is equal to electric capacity two ends
After voltage, synchronous rectification Mosfet work is driven by Mosfet driver output high level.
Step 3 is specifically implemented according to following steps：
Step 3.1, current transformer a secondary current continue to charge to electric capacity, treat that electric capacity (6) voltage reaches the steady of stabilivolt
Pressure value, has electric current to flow through so that audion (13) turns in stabilivolt, and then the conducting of driving switch pipe；
Step 3.2, through step 3.1 switching tube conducting after, by current transformer a secondary short circuit, now current transformer a pair
Side electric current all flows through switching tube, but current transformer a secondary voltage becomes zero, reduces current transformer secondary voltage and electricity
Overlapping of stream, reduces the loss of synchronous rectification driving circuit.
Step 4 is specifically implemented in accordance with the following methods：
When equivalent for the current transformer a exciting current to secondary is more than current transformer a secondary current, current transformer
B secondary current drives audion a conducting, and by Mosfet driver input end voltage vanishing, Mosfet driver exports low electricity
Flat shutoff synchronous rectification Mosfet, the gate source voltage of Simultaneous Switching pipe passes through diode discharge, and switching tube turns off, and synchronous rectification is driven
Galvanic electricity road quits work.
The beneficial effects of the present invention is：
1. the present invention is reduced in the method for synchronous rectification driving circuit loss based on coupling coil, adopts current transformer
The mode of a secondary paralleling switch, after synchronous rectification driving circuit output driving meets requirement, opens switching tube in parallel,
Will current transformer a secondary short circuit, short circuit mode make current transformer a secondary voltage x current overlap reduce, thus
Reduce the power attenuation of additional driver circuit.
2., because the electric current flowing through power Mosfet in side circuit is change, lead to current transformer a secondary electricity
Stream be also change, due to each current transformer a secondary current flow through diode a, diode b to electric capacity charge it is necessary to
The voltage stabilizing value being charged to stabilivolt just can make audion b turn on, and then driving switch pipe conducting, with current transformer a secondary
The change of size of current, the Voltage Pulse Width of current transformer a secondary can automatically adjust width, makes current transformer all the time
The Voltage Pulse Width of a secondary is in optimized state, and optimized Voltage Pulse Width reduces the pair of current transformer a
Side is lost.
3. reduce in the method for synchronous rectification driving circuit loss in the present invention based on coupling coil, by switching tube
The mode of current transformer b is added so that the equivalent exciting current to secondary working as current transformer a is mutual more than electric current in branch road
During the secondary current of sensor a, switching tube branch current direction inverts, then current transformer b secondary current drives audion a conducting
The input of Mosfet driver is dragged down, synchronous rectification driving circuit exports low level；Control electric current thus can be passed through
The size of the exciting current of transformer a is accurately synchronized with rectification making the driving low level output of synchronous rectification driving circuit
The current signal of branch road, the further on-state loss reducing rectification branch road.
4. the method based on coupling coil reduction synchronous rectification driving circuit loss for the present invention not only can be in discontinuous current
In the case of use, can also use in the case of electric current is continuous, every need the place using synchronous rectification can
Use.
Brief description
Fig. 1 is that the synchronization being related in the method based on coupling coil reduction synchronous rectification driving circuit loss of the present invention is whole
The structural representation of stream drive circuit.
In figure, 1. synchronous rectification Mosfet parasitic diode, 2. current transformer a, 3. current transformer b, 4.Mosfet
Driver, 5. switching tube, 6. electric capacity, 7. diode a, 8. diode b, 9. diode c, 10. stabilivolt, 11. diode d, 12.
Triode a, 13. audion b, 14. resistance R1, 15. resistance R2, 16. resistance R3.
Specific embodiment
The present invention based on coupling coil reduce synchronous rectification driving circuit loss method, as shown in figure 1, specifically according to
Lower step is implemented：
Step 1, structure synchronous rectification driving circuit, concrete grammar is as follows：
Synchronous rectification driving circuit, concrete as shown in figure 1, what the dotted line inframe in Fig. 1 represented is to substitute existing rectification two
The synchronous rectification Mosfet of pole pipe, the branch road that it is located is rectification branch road；
One current transformer a2 is added on rectification branch road, current transformer a2 carrys out sensed current signal；Mutual in electric current
The secondary of sensor a2 connects a switching tube 5, is turned on using switching tube 5 and the principle of secondary short circuit reduces synchronous rectification driving
The loss of circuit；
One current transformer b3, one in parallel of the secondary of current transformer b3 are added on the branch road that switching tube 5 is located again
The two ends of diode c9, a diode c9 triode a12 in parallel again；Wherein, the negative electrode of diode c9 connects the base of audion a12
Pole, the anode of diode c9 connects the emitter stage of audion a12；
Again the secondary A terminal of current transformer a2 is connected to the anode of diode a7；The negative electrode of diode a7 is coupled with
The colelctor electrode of the anode of diode b8, the input of Mosfet driver 4 and audion a12；The negative electrode of diode b8 is connect
To the emitter stage of audion b13 and the power end of Mosfet driver 4；
It is connected in parallel with a capacitor 6 in the power end of Mosfet driver 4 and earth terminal, in emitter stage and the base of audion b13
A resistance R in parallel between pole114, the colelctor electrode of audion b13 and resistance R316 one end connects, resistance R316 other end
Connect with the grid of switching tube 5；The negative electrode of the base stage of audion b13 and stabilivolt 10 connects, the anode of stabilivolt 10 with
The earth terminal connection of Mosfet driver 4, the outfan of Mosfet driver 4 and input one resistance R of parallel connection215, opening
The output of the grid and Mosfet driver 4 that close pipe 5 terminates a diode d11, and the negative electrode of diode d11 meets Mosfet and drives
The outfan of device 4, the grid of the hot end of switching tube 5 of diode d11；
By the B end of current transformer a2 secondary, the drain electrode of switching tube 5, the emitter stage of audion a12, stabilivolt 10 sun
Pole, the earth terminal of Mosfet driver 4 are all connected together and then draw single line as the ground connection of synchronous rectification drive signal
End, draws single line as the other end of synchronous rectification drive signal from the outfan of Mosfet driver 4.
Wherein, (input terminal voltage is higher than that threshold drive device exports high level, input to the homophase Mosfet driver 4 being related to
Terminal voltage is less than threshold drive device and exports low level), the model that abbreviation PD adopts is TC1413, the homophase Mosfet of other models
Driver is all applicable.
The synchronous rectification driving circuit constructing is not limited to a certain specific circuit topology, and all topologys all can be fitted
With.
Step 2, construct after synchronous rectification driving circuit through step 1, detect rectification branch current signal, with detect
Current signal is synchronously driven to open signal, and concrete grammar is as follows：
Step 2.1, construct after synchronous rectification driving circuit through step 1, connect synchronous rectification driving circuit, electric current i1Stream
Cross synchronous rectification Mosfet parasitic diode 1, that is, flow through the former limit of current transformer a2, induced by current transformer a2 secondary
Electric current i2, electric current i2Respectively flow through diode a7, diode b8, complete to charge to electric capacity 6；
Step 2.2, through step 2.1 give electric capacity 6 charging after, treat Mosfet driver 4 input terminal voltage be equal to electric capacity 6 two ends
Voltage after, by Mosfet driver 4 export high level drive synchronous rectification Mosfet work；
I.e. once there being electric current to flow through synchronous rectification Mosfet, current transformer a2 secondary induces electric current and will trigger synchronization
Commutation driver circuit exports high level, solves synchronous rectification driving circuit outputting drive voltage rising edge and flows through synchronous rectification
The stationary problem of Mosfet electric current rising time.Because synchronous rectification driving circuit response speed is quickly so that rectified current stream
The time of overpower Mosfet parasitic diode 1 is shorter, reduces changer on-state loss；
Step 3, through step 2 commutation driver circuit to be synchronized output high level after, synchronous rectification driving circuit pass through inside
So that current transformer a2 secondary short circuit, with the change of rectification branch current, adaptive regulation electric current is mutual for the regulation of circuit
The Voltage Pulse Width of sensor a2 secondary, to optimum state, is specifically implemented in accordance with the following steps：
Step 3.1, current transformer a2 secondary current continue to charge to electric capacity 6, treat that electric capacity 6 voltage reaches stabilivolt 10
Voltage stabilizing value, has electric current to flow through in stabilivolt 10 so that audion 13 turns on, and then driving switch pipe 5 turns on；
I.e. no matter how rectification branch current changes, and current transformer a2 secondary current is all first by the electricity at electric capacity 6 two ends
Pressure charging requirement value, it is achieved that the Automatic adjusument of circuit, solves circuit under different conditions and is automatically obtained optimized problem；
Step 3.2, through step 3.1 switching tube 5 conducting after, by current transformer a2 secondary short circuit, now current transformer
A2 secondary current all flows through switching tube 5, but current transformer a2 secondary voltage becomes zero, reduces current transformer secondary electricity
Pressure is overlapping with electric current, solves and is overlapped and led to due to synchronous rectification driving circuit current transformer a2 secondary voltage and electric current
The big problem of loss, reduce the loss of synchronous rectification driving circuit.
Step 4, through step 3, synchronous rectifier is closed by the relation using exciting current summation current transformer a2 secondary current
Disconnected, concrete grammar is as follows：
When equivalent for the current transformer a2 exciting current to secondary is more than current transformer a2 secondary current, Current Mutual Inductance
Device b3 secondary current drives audion a12 conducting, and by Mosfet driver 4 input terminal voltage vanishing, Mosfet driver 4 is defeated
Go out low level and turn off synchronous rectification Mosfet, the gate source voltage of Simultaneous Switching pipe 5 is discharged by diode 11, and switching tube 5 turns off,
Synchronous rectification driving circuit quits work；Solve synchronous rectification driving circuit output by adding current transformer b3 well
The trailing edge of driving voltage and flow through synchronous rectification Mosfet current value close to zero moment stationary problem, makes to flow through as far as possible
Synchronous rectification Mosfet electric current flows through conducting channel rather than the parasitic diode of Mosfet, and the on-state reducing changer is damaged
Consumption.
The method that the present invention reduces synchronous rectification driving circuit loss based on coupling coil, adds electric current in rectification branch road
Transformer a2 detection electric current provides synchronizing signal to synchronous rectification driving circuit, and using regulation circuit in changer rectification branch road
The adaptive pulse width adjusting current transformer a2 secondary voltage in the case of curent change, reduces synchronous rectification and drives
The loss of circuit；When synchronous rectifier is opened, synchronous rectification driving circuit can provide transient high-current to synchronous rectifier
Gate-source capacitance charges, and when synchronous rectifier turns off, synchronous rectification driving circuit provides low-resistance to synchronous rectifier gate-source capacitance
Anti- discharge loop, improves the switching speed of synchronous rectifier；And by way of adding current transformer b3, mutual using electric current
The relation of sensor a2 exciting current and secondary current is carried out synchronized rectification and is driven cut-off signals it is achieved that the height of synchronous rectifier
Fast break-make, and reduce changer on-state loss to greatest extent, and reduce synchronous rectification driving circuit added losses.This
Outward, the circuit of synchronous rectification output drive signal of structure does not change with the change of changer working condition, has steady well
Qualitative；And the current transformer volume very little in drive circuit, be conducive to the raising of power density.
Claims (5)
1. the method for synchronous rectification driving circuit loss is reduced it is characterised in that specifically according to following steps based on coupling coil
Implement：
Step 1, structure synchronous rectification driving circuit；
Step 2, construct after synchronous rectification driving circuit through step 1, detect rectification branch current signal, with the electric current detecting
Signal is synchronously driven to open signal；
Step 3, through step 2 commutation driver circuit to be synchronized output high level after, synchronous rectification driving circuit pass through internal circuit
Regulation so that current transformer a (2) secondary short circuit, with the change of rectification branch current, adaptive regulation Current Mutual Inductance
The Voltage Pulse Width of device a (2) secondary, to optimum state, is specifically implemented according to following steps：
Step 3.1, current transformer a (2) secondary current continue to charge to electric capacity (6), treat that electric capacity (6) voltage reaches stabilivolt
(10) voltage stabilizing value, has electric current to flow through in stabilivolt (10) so that audion (13) turns on, and then driving switch pipe (5) conducting；
Step 3.2, through step 3.1 switching tube (5) conducting after, by current transformer a (2) secondary short circuit, now current transformer a
(2) secondary current all flows through switching tube (5), but current transformer a (2) secondary voltage becomes zero, reduces current transformer
Secondary voltage and electric current overlapping, reduce the loss of synchronous rectification driving circuit；
Step 4, through step 3, synchronous rectifier is turned off by the relation using exciting current summation current transformer a (2) secondary current.
2. the method reducing synchronous rectification driving circuit loss based on coupling coil according to claim 1, its feature exists
In described step 1 is specifically implemented in accordance with the following methods：
One current transformer a (2) is added on rectification branch road, current transformer a (2) carrys out sensed current signal；Mutual in electric current
The secondary of sensor a (2) connects a switching tube (5), is reduced the principle of secondary short circuit using switching tube (5) conducting synchronous whole
The loss of stream drive circuit；
One current transformer b (3), the secondary parallel connection one of current transformer b (3) are added on the branch road that switching tube (5) is located again
Individual diode c (9), a two ends triode a (12) in parallel again of diode c (9)；Wherein, the negative electrode of diode c (9) connects three
The base stage of pole pipe a (12), the anode of diode c (9) connects the emitter stage of audion a (12)；
Again the secondary A terminal of current transformer a (2) is connected to the anode of diode a (7)；The negative electrode of diode a (7) connects respectively
Colelctor electrode to the anode, the input of Mosfet driver (4) and audion a (12) of diode b (8)；By diode b
(8) negative electrode is connected to the emitter stage of audion b (13) and the power end of Mosfet driver (4)；
Be connected in parallel with a capacitor (6) in the power end of Mosfet driver (4) and earth terminal, audion b (13) emitter stage and
A resistance R in parallel between base stage1(14), the colelctor electrode of audion b (13) and resistance R3(16) one end connects, described resistance
R3(16) the other end and the grid of switching tube (5) connect；The negative electrode of the base stage of audion b (13) and stabilivolt (10) connects,
The anode of described stabilivolt (10) is connected with the earth terminal of Mosfet driver (4), the outfan of described Mosfet driver (4)
With input one resistance R of parallel connection2(15), indirect the one of the grid of switching tube (5) and the outfan of Mosfet driver (4)
Individual diode d (11), the negative electrode of described diode d (11) connects the outfan of Mosfet driver (4), the sun of diode d (11)
Pole connects the grid of switching tube (5)；
By the B end of current transformer a (2) secondary, the drain electrode of switching tube (5), the emitter stage of audion a (12), stabilivolt (10)
Anode, the earth terminal of Mosfet driver (4) is all connected together and then draws single line as synchronous rectification drive signal
Earth terminal, draw single line as the other end of synchronous rectification drive signal from the outfan of Mosfet driver (4).
3. the method reducing synchronous rectification driving circuit loss based on coupling coil according to claim 2, its feature exists
In Mosfet driver (4) model TC1413 in described step 1.
4. the method reducing synchronous rectification driving circuit loss based on coupling coil according to claim 2, its feature exists
In described step 2 is specifically implemented according to following steps：
Step 2.1, construct after synchronous rectification driving circuit through step 1, connect synchronous rectification driving circuit, electric current i1Flow through same
Step rectification Mosfet parasitic diode (1), that is, flow through the former limit of current transformer a (2), is sensed by current transformer a (2) secondary
Go out electric current i2, electric current i2Respectively flow through diode a (7), diode b (8), complete to charge to electric capacity (6)；
Step 2.2, through step 2.1 give electric capacity (6) charging after, treat Mosfet driver (4) input terminal voltage be equal to electric capacity (6) two
After the voltage at end, synchronous rectification Mosfet work is driven by Mosfet driver (4) output high level.
5. the method reducing synchronous rectification driving circuit loss based on coupling coil according to claim 1, its feature exists
In described step 4 is specifically implemented in accordance with the following methods：
When equivalent for current transformer a (2) exciting current to secondary is more than current transformer a (2) secondary current, Current Mutual Inductance
Device b (3) secondary current drives audion a (12) conducting, and by Mosfet driver (4) input terminal voltage vanishing, Mosfet drives
Dynamic device (4) output low level turns off synchronous rectification Mosfet, and the gate source voltage of Simultaneous Switching pipe (5) is put by diode (11)
Electricity, switching tube (5) turns off, and synchronous rectification driving circuit quits work.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510017139.1A CN104601016B (en) | 2015-01-13 | 2015-01-13 | Method for reducing loss of synchronous rectification drive circuit based on coupling coil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510017139.1A CN104601016B (en) | 2015-01-13 | 2015-01-13 | Method for reducing loss of synchronous rectification drive circuit based on coupling coil |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104601016A CN104601016A (en) | 2015-05-06 |
| CN104601016B true CN104601016B (en) | 2017-02-08 |
Family
ID=53126599
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510017139.1A Expired - Fee Related CN104601016B (en) | 2015-01-13 | 2015-01-13 | Method for reducing loss of synchronous rectification drive circuit based on coupling coil |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104601016B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9991880B2 (en) * | 2016-06-07 | 2018-06-05 | Ford Global Technologies, Llc | Discrete power switching devices with reduced common source inductance |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1387694A (en) * | 1999-11-05 | 2002-12-25 | 艾利森公司 | Externally-driven scheme for synchronous rectification |
| CN1538610A (en) * | 2003-10-24 | 2004-10-20 | 中兴通讯股份有限公司 | Driving device of synchronous rectifier transistor |
| WO2010056989A1 (en) * | 2008-11-14 | 2010-05-20 | Flextronics International Usa, Inc. | Driver for a synchronous rectifier and power converter employing the same |
| CN203859683U (en) * | 2014-05-16 | 2014-10-01 | 西安唯电电气技术有限公司 | Synchronous rectification drive circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9413246B2 (en) * | 2012-04-12 | 2016-08-09 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for regulating power conversion systems with output detection and synchronized rectifying mechanisms |
-
2015
- 2015-01-13 CN CN201510017139.1A patent/CN104601016B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1387694A (en) * | 1999-11-05 | 2002-12-25 | 艾利森公司 | Externally-driven scheme for synchronous rectification |
| CN1538610A (en) * | 2003-10-24 | 2004-10-20 | 中兴通讯股份有限公司 | Driving device of synchronous rectifier transistor |
| WO2010056989A1 (en) * | 2008-11-14 | 2010-05-20 | Flextronics International Usa, Inc. | Driver for a synchronous rectifier and power converter employing the same |
| CN203859683U (en) * | 2014-05-16 | 2014-10-01 | 西安唯电电气技术有限公司 | Synchronous rectification drive circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104601016A (en) | 2015-05-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104539163B (en) | The synchronous rectification control method and its control module of anti exciting converter | |
| CN102983760B (en) | Flyback switching power system and constant current controller thereof | |
| CN107425728B (en) | A kind of digital optimal control method and its system of the synchronous rectification of LLC full-bridge converter | |
| CN102170228B (en) | Dead time control circuit used in a DC-DC converter | |
| CN107017780A (en) | The isolated form DC DC booster converters and its control method of a kind of band pull-up active clamp branch road | |
| CN102684462A (en) | Novel low end metal oxide semiconductor field effect transistor (MOSFET)/ insulated gate bipolar transistor (IGBT) negative pressure clamping driving circuit and control method thereof | |
| CN103683861B (en) | A kind of novel thyristor gating circuit | |
| CN203883693U (en) | Switching inductive current-type synchronous rectifying circuit with phase compensation function | |
| CN202759634U (en) | LED drive circuit without auxiliary winding | |
| CN104601016B (en) | Method for reducing loss of synchronous rectification drive circuit based on coupling coil | |
| CN203911764U (en) | High light-load efficiency digital power supply suitable for server | |
| CN201754562U (en) | Active clamp delay shutdown circuit | |
| CN204156616U (en) | For the self-induction power-supply circuit of intelligent grid sensing device | |
| CN203911763U (en) | Digital power supply suitable for CPU | |
| CN202586786U (en) | Synchronous rectification circuit based on synchronous rectification chip low-voltage-output push-pull converter | |
| CN201985758U (en) | DC-DC (direct current-direct current) converter | |
| CN107482932A (en) | A kind of self-powered double pole triode drive circuit and switching power circuit | |
| CN103997194B (en) | A kind of driving method of BUCK circuits breaker in middle pipe | |
| CN115053443A (en) | Bridgeless Power Factor Correction (PFC) circuit | |
| CN208489798U (en) | The synchronous rectifying controller of adaptive adjustment driving voltage and the circuit for using it | |
| CN202309182U (en) | Charging phase-shifting controller | |
| CN206865428U (en) | Interval electrical equipment power off in standby state of electric energy saver | |
| CN205986627U (en) | Switch power supply circuit | |
| CN102170232A (en) | Self-driven active buffer and flyback switching mode power supply | |
| CN204334375U (en) | Two end rectifying devices and there is the circuit of two end rectifying devices |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170208 Termination date: 20180113 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |