CN106655815A - Synchronous rectification circuit - Google Patents
Synchronous rectification circuit Download PDFInfo
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- CN106655815A CN106655815A CN201611188157.7A CN201611188157A CN106655815A CN 106655815 A CN106655815 A CN 106655815A CN 201611188157 A CN201611188157 A CN 201611188157A CN 106655815 A CN106655815 A CN 106655815A
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- 230000001360 synchronised effect Effects 0.000 title claims abstract description 35
- 238000001914 filtration Methods 0.000 claims abstract description 30
- 230000009514 concussion Effects 0.000 claims description 45
- 238000004804 winding Methods 0.000 claims description 18
- 238000010521 absorption reaction Methods 0.000 claims description 7
- 230000005611 electricity Effects 0.000 claims description 7
- 210000001699 lower leg Anatomy 0.000 claims description 6
- 101000941170 Homo sapiens U6 snRNA phosphodiesterase 1 Proteins 0.000 claims description 4
- 102100031314 U6 snRNA phosphodiesterase 1 Human genes 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 abstract description 6
- 230000010355 oscillation Effects 0.000 abstract 4
- 230000008859 change Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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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
- 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
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
-
- 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
-
- 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
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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 discloses a synchronous rectification circuit, which comprises a power input circuit, a rectification and filtering circuit, an oscillation IC control circuit, a primary side feedback circuit, a high-frequency transformer and a synchronous rectification output circuit, and is characterized in that the rectification and filtering circuit is connected with the power input circuit and performs rectification and filtering on input current, the high-frequency transformer comprises a primary main coil, a primary auxiliary coil and a secondary output coil, the rectification and filtering circuit is connected with the oscillation IC control circuit and the primary main coil of the high-frequency transformer, the primary side feedback circuit is connected with the oscillation IC control circuit and the primary auxiliary coil of the high-frequency transformer and provides operating voltages for the oscillation IC control circuit, and the secondary output coil of the high-frequency transformer is connected with the synchronous rectification output circuit; and the synchronous rectification output circuit replaces a secondary rectification Schottky diode, improves the current output capacity, improves the conversion efficiency and reduces the temperature of an IC.
Description
Technical field
The present invention relates to charging circuit field, and in particular to circuit of synchronous rectification.
Background technology
Mains charger is a kind of housed device commonly used in people's daily life, many families such as mobile phone, computer, electric motor car
Electrical appliance all can be using to charger；The pattern of existing charger and had nothing in common with each other using object, but adopted more existing charger
Discrete component, the use of a large amount of discrete components cause high processing costs, complex process to cause the repair rate of product higher, in addition electricity
Line structure is complex, and circuit reliability is not high, and circuit linearity, load regulation are poor, also compares power consumption, current output capability
Difference, lifts conversion efficiency low.
The content of the invention
It is an object of the invention to provide a kind of low production cost, circuit reliability height and low-power consumption and current output capability
Height, high conversion efficiency and can reduce the circuit of synchronous rectification of IC temperature.
The present invention is achieved through the following technical solutions：Circuit of synchronous rectification, including power supply input circuit, rectifying and wave-filtering electricity
Road, concussion IC control circuits, primary side feedback circuit, high frequency transformer and synchronous rectification output circuit；The current rectifying and wave filtering circuit
Connection power supply input circuit is that the electric current of input carries out rectifying and wave-filtering, and the high frequency transformer includes that primary main coil, primary are secondary
Coil and secondary output winding, the current rectifying and wave filtering circuit connects respectively concussion IC control circuits and the primary of high frequency transformer is main
Coil, the primary side feedback circuit is connected respectively and to shake with the primary secondary coil of concussion IC control circuits and high frequency transformer
IC control circuits provide running voltage, the secondary output winding connection synchronous rectification output circuit of the high frequency transformer；It is described
Power supply input circuit includes live wire input, zero line input, common mode inductance and bridge heap integrated package, the live wire input connection
4th foot of common mode inductance, the zero line input connects the crus secunda of common mode inductance, the 3rd foot connection of the common mode inductance
The crus secunda of bridge heap integrated package, the first foot of the first foot cross structure heap integrated package of the common mode inductance, the bridge heap integrated package
The 3rd foot connect power supply ground, the 4th foot of the bridge heap integrated package connects current rectifying and wave filtering circuit；The live wire input and common mode electricity
Electric fuse is in series between 4th foot of sense；The current rectifying and wave filtering circuit includes the first electric capacity, the second electric capacity, the second inductance and the
Three electric capacity, the 4th foot of the power supply input circuit jackshaft heap integrated package connects one end of the first electric capacity, first electric capacity
One end is also connected with one end of the second inductance, and the other end of second inductance connects one end of the second electric capacity, second electric capacity
One end be also connected with the other end of one end of the 3rd electric capacity, first electric capacity and the second electric capacity and the 3rd electric capacity and all connect power supply
Ground；One end of 3rd electric capacity is further connected to the 5th pin of the primary main coil of high frequency transformer and concussion IC controls
Circuit；The concussion IC control circuits include the 7th electric capacity, the 8th electric capacity, 3rd resistor, first resistor, the first diode, shake
Swing IC chip, the 5th resistance, the 6th resistance, the 7th resistance, the 9th resistance and the tenth resistance；The 3rd in the current rectifying and wave filtering circuit
One end of electric capacity connects one end of the 7th electric capacity, and one end of the 7th electric capacity is also connected with one end of 3rd resistor, and the described 3rd
One end of resistance is additionally coupled to the 5th pin of the primary main coil of high frequency transformer, the other end connection of the 7th electric capacity the
The other end of three resistance, the other end of the 7th electric capacity is also connected with one end of first resistor, the other end of the first resistor
Connect the negative pole of the first diode, the positive pole of first diode is connected to the 4th of the primary main coil of high frequency transformer and draws
Foot, the 5th pin of the concussion IC chip, the 6th pin, the 7th pin and the 8th pin are connected with each other and connect tremendously high frequency change
4th pin of the primary main coil of depressor, the first pin of the concussion IC chip connects power supply ground, the concussion IC chip
4th pin connects one end of the 5th resistance, and one end of the 5th resistance connects one end of the 6th resistance, the 6th resistance
One end connect one end of the 7th resistance, the other end of the 5th resistance, the 6th resistance and the 7th resistance all connects power supply ground；Institute
The 3rd pin for stating concussion IC chip connects one end of the tenth resistance, another termination power ground of the tenth resistance, and described the
Ten resistance the 8th electric capacity also in parallel, one end of the tenth resistance is also connected with one end of the 9th resistance, the 9th resistance it is another
One end is connected to the first pin of the primary secondary coil of high frequency transformer, and the first of the primary secondary coil of the high frequency transformer draws
Foot is also associated with primary side feedback circuit；3rd pin of the primary secondary coil of the high frequency transformer connects power supply ground, the high frequency
3rd pin of the primary secondary coil of transformator is also associated with being spaced one end of electric capacity, another termination output of the interval electric capacity
Negative pole end；The primary side feedback circuit includes the second diode, the 8th resistance and the 6th electric capacity, the primary of the high frequency transformer
First pin of secondary coil connects the positive pole of the second diode, and the negative pole connection of second diode shakes the second of IC chip
Pin, the second pin of the concussion IC chip is also connected with one end of the 6th electric capacity, another termination power of the 6th electric capacity
Ground；The synchronous rectification output circuit include rectification IC chip, the 4th electric capacity, the 5th electric capacity, the 9th electric capacity, the tenth electric capacity, the
It is 12 resistance, the 13rd resistance, the 14th resistance, the 15th resistance, the 16th resistance, the 21st resistance, the 26th electric
Resistance, the first USB port, the second USB port, the 3rd USB port, output cathode end and output negative pole end；The high frequency transformer
The tenth pin of secondary output winding be connected to the first pin of rectification IC chip, the first pin of the rectification IC chip is also
Connect one end of the 4th electric capacity, one end of the 4th electric capacity is also connected with one end of the 5th electric capacity, one end of the 5th electric capacity
One end of the 15th resistance is also connected with, one end of the 15th resistance is also connected with output cathode end, the rectification IC chip
The other end of the 6th pin, the 7th pin, the 8th pin and the 4th electric capacity, the other end of the 5th electric capacity, the 15th resistance
The other end all connects output negative pole end；5th pin of the rectification IC chip is connected to one end of the 14th resistance, and the described tenth
The other end of four resistance is connected to the second pin of rectification IC chip, and the 5th pin of the rectification IC chip is also connected with high frequency change
9th pin of the secondary output winding of depressor, one end of the 14th resistance is also connected with one end of the 9th electric capacity, and described
The other end of nine electric capacity connects one end of the 12nd resistance, the other end connection output negative pole end of the 12nd resistance；It is described
One end of 3rd pin the 13rd resistance of connection of rectification IC chip, another termination output negative pole end of the 13rd resistance,
4th pin of the rectification IC chip connects one end of the tenth electric capacity, another termination output negative pole end of the tenth electric capacity；
One end of 16th resistance, one end of the 21st resistance and one end of the 26th resistance all connect output negative pole end, institute
The other end for stating the 16th resistance connects the first USB port, and the other end of the 21st resistance connects the second USB port,
The other end of the 26th resistance connects the 3rd USB port；Model PN8305 of the rectification IC chip, the described 4th
Electric capacity and the 5th electric capacity are all polarized electric capacity, and the 13rd resistance and the 15th resistance are current-limiting resistance, the described 12nd
Resistance and the 14th resistance are absorption resistance；Model PN8386 of the concussion IC chip, the 9th resistance and the tenth electric
Hinder for divider resistance, the 5th resistance, the 6th resistance and the 7th resistance are all current-limiting resistance.
The present invention includes power supply input circuit, current rectifying and wave filtering circuit, concussion IC control circuits, primary side feedback circuit, high frequency
Transformator and synchronous rectification output circuit；The current rectifying and wave filtering circuit connection power supply input circuit is that the electric current of input carries out rectification
Filtering, the high frequency transformer includes primary main coil, primary secondary coil and secondary output winding, the current rectifying and wave filtering circuit point
The primary main coil of IC control circuits and high frequency transformer Lian Jie not be shaken, the primary side feedback circuit is controlled respectively with concussion IC
The primary secondary coil of circuit and high frequency transformer connects and provides running voltage, the high frequency transformer to shake IC control circuits
Secondary output winding connection synchronous rectification output circuit；Synchronous rectification output circuit instead of the pole of secondary commutation Schottky two
Pipe, improves current output capability, lifts conversion efficiency and reduces the temperature of IC.
The invention has benefit that：1）Circuit reduction is practical, simple structure, and reliability is improved；2）Improve circuit line
Property and load regulation, reducing energy consumption；3）Improve current output capability and conversion efficiency；4）Reduce the temperature of IC.
Description of the drawings
Fig. 1 is the circuit theory diagrams of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawings with specific embodiment, the invention will be further described.
See Fig. 1, circuit of synchronous rectification, including power supply input circuit, current rectifying and wave filtering circuit, concussion IC control circuits, former limit
Feedback circuit, high frequency transformer and synchronous rectification output circuit；The current rectifying and wave filtering circuit connection power supply input circuit is input
Electric current carry out rectifying and wave-filtering, the high frequency transformer includes primary main coil, primary secondary coil and secondary output winding, described
Current rectifying and wave filtering circuit connects respectively the primary main coil of concussion IC control circuits and high frequency transformer, the primary side feedback circuit point
It is not connected with the primary secondary coil of concussion IC control circuits and high frequency transformer and provides running voltage to shake IC control circuits,
The secondary output winding connection synchronous rectification output circuit of the high frequency transformer；The power supply input circuit is input into including live wire
End L, zero line input N, common mode inductance LF1 and bridge heap integrated package BD1, the of live wire input L connection common mode inductance LF1
Four feet, the zero line input N connects the crus secunda of common mode inductance LF1, and the 3rd foot cross structure of the common mode inductance LF1 is heaped
The crus secunda of in bulk BD1, first foot of the first foot cross structure heap integrated package BD1 of the common mode inductance LF1, the bridge heap is integrated
3rd foot of block BD1 connects power supply ground, and the 4th foot of the bridge heap integrated package BD1 connects current rectifying and wave filtering circuit；The live wire input L
Electric fuse F1 is in series with and the 4th foot of common mode inductance LF1 between；The current rectifying and wave filtering circuit includes the first electric capacity C1, second electric
Hold C2, the second inductance L2 and the 3rd electric capacity C3, the 4th foot connection first of the power supply input circuit jackshaft heap integrated package BD1 is electric
Hold one end of C1, one end of the first electric capacity C1 is also connected with one end of the second inductance L2, the other end of the second inductance L2
Connect one end of the second electric capacity C2, one end of the second electric capacity C2 is also connected with one end of the 3rd electric capacity C3, first electric capacity
The other end of C1 and the second electric capacity C2 and the 3rd electric capacity C3 all connects power supply ground；One end of the 3rd electric capacity C3 is also respectively connected with
5th pin and concussion IC control circuits of the primary main coil of paramount frequency power transformer；The concussion IC control circuits include the 7th
Electric capacity C7, the 8th electric capacity C8,3rd resistor R3, first resistor R1, the first diode D1, concussion IC chip U1, the 5th resistance R5,
6th resistance R6, the 7th resistance R7, the 9th resistance R9 and the tenth resistance R10；3rd electric capacity C3 in the current rectifying and wave filtering circuit
One end connects one end of the 7th electric capacity C7, and one end of the 7th electric capacity C7 is also connected with one end of 3rd resistor R3, and the described 3rd
One end of resistance R3 is additionally coupled to the 5th pin of the primary main coil of high frequency transformer, and the other end of the 7th electric capacity C7 connects
The other end of 3rd resistor R3 is connect, the other end of the 7th electric capacity C7 is also connected with one end of first resistor R1, and described first is electric
The other end of resistance R1 connects the negative pole of the first diode D1, and the positive pole of the first diode D1 is connected to the first of high frequency transformer
4th pin of level main coil, the 5th pin of concussion IC chip U1, the 6th pin, the 7th pin and the 8th pin are mutual
Connect and be connected to the 4th pin of the primary main coil of high frequency transformer, the first pin of concussion IC chip U1 connects power supply
Ground, the 4th pin of concussion IC chip U1 connects one end of the 5th resistance R5, one end connection the of the 5th resistance R5
One end of six resistance R6, one end of the 6th resistance R6 connects one end of the 7th resistance R7, the 5th resistance R5, the 6th electric
The other end of resistance R6 and the 7th resistance R7 all connects power supply ground；3rd pin of concussion IC chip U1 connects the tenth resistance R10
One end, another termination power ground of the tenth resistance R10, the tenth resistance R10 also the 8th electric capacity C8 of parallel connection, described the
One end of ten resistance R10 is also connected with one end of the 9th resistance R9, and the other end of the 9th resistance R9 is connected to high frequency transformer
Primary secondary coil the first pin, the first pin of the primary secondary coil of the high frequency transformer is also associated with primary side feedback electricity
Road；3rd pin of the primary secondary coil of the high frequency transformer connects power supply ground, the primary secondary coil of the high frequency transformer
3rd pin is also associated with being spaced one end of electric capacity CY1, another termination output negative pole end V0- of the interval electric capacity CY1；It is described
Primary side feedback circuit includes the second diode D2, the 8th resistance R8 and the 6th electric capacity C6, the primary by-pass of the high frequency transformer
First pin of circle connects the positive pole of the second diode D2, and the of negative pole connection concussion IC chip U1 of the second diode D2
Two pins, the second pin of concussion IC chip U1 is also connected with one end of the 6th electric capacity C6, and the 6th electric capacity C6's is another
Termination power ground；The synchronous rectification output circuit includes rectification IC chip U2, the 4th electric capacity C4, the 5th electric capacity C5, the 9th electric
Hold C9, the tenth electric capacity C10, the 12nd resistance R12, the 13rd resistance R13, the 14th resistance R14, the 15th resistance R15, the tenth
Six resistance R16, the 21st resistance R21, the 26th resistance R26, the first USB port USB1, the second USB port USB2,
Three USB port USB3, output cathode end V0+ and output negative pole end V0-；The tenth of the secondary output winding of the high frequency transformer
Pin is connected to the first pin of rectification IC chip U2, and the first pin of rectification IC chip U2 is also connected with the 4th electric capacity C4's
One end, one end of the 4th electric capacity C4 is also connected with one end of the 5th electric capacity C5, and one end of the 5th electric capacity C5 is also connected with
One end of 15 resistance R15, one end of the 15th resistance R15 is also connected with output cathode end V0+, rectification IC chip U2
The 6th pin, the 7th pin, the other end of the 8th pin and the 4th electric capacity C4, the other end of the 5th electric capacity C5, the 15th
The other end of resistance R15 all meets output negative pole end V0-；5th pin of rectification IC chip U2 is connected to the 14th resistance
One end of R14, the other end of the 14th resistance R14 is connected to the second pin of rectification IC chip U2, the rectification IC cores
5th pin of piece U2 is also connected with the 9th pin of the secondary output winding of high frequency transformer, and the one of the 14th resistance R14
End is also connected with one end of the 9th electric capacity C9, and the other end of the 9th electric capacity C9 connects one end of the 12nd resistance R12, and described the
The other end connection output negative pole end V0- of 12 resistance R12；3rd pin of rectification IC chip U2 connects the 13rd resistance
One end of R13, another termination output negative pole end V0- of the 13rd resistance R13, the 4th pin of rectification IC chip U2
Connect one end of the tenth electric capacity C10, another termination output negative pole end V0- of the tenth electric capacity C10；16th resistance
One end of one end of R16, one end of the 21st resistance R21 and the 26th resistance R26 all meets output negative pole end V0-, described
The other end of the 16th resistance R16 connects the first USB port USB1, the other end connection second of the 21st resistance R21
The other end of USB port USB3, the 26th resistance R26 connects the 3rd USB port USB3；Rectification IC chip U2
Model PN8305, the 4th electric capacity C4 and the 5th electric capacity C5 is polarized electric capacity, the 13rd resistance R13 and the tenth
Five resistance R15 are current-limiting resistance, and the 12nd resistance R12 and the 14th resistance R14 is absorption resistance；The concussion IC chip
Model PN8386 of U1, the 9th resistance R9 and the tenth resistance R10 is divider resistance, the 5th resistance R5, the 6th electric
Resistance R6 and the 7th resistance R7 is current-limiting resistance.
In present embodiment, 4 SW pins of the first chip U1 are connected to the 7th of main winding and draw after being connected with each other
Foot, and also the clamp circuit absorption constituted by first resistor R1,3rd resistor R3, the 7th electric capacity C7 and the first diode D1
It is connected with each other with the 8th pin of main winding after drain-source end spike voltage inside first chip U1.
In present embodiment, electric fuse F1 is in series between the live wire input L and the 4th foot of common mode inductance LF1,
For protecting power input excessive；Electrical network from live wire input L and zero line input N input powers, through common mode inductance LF1 and
Bridge heap integrated package BD1 rectifications, then the primary main coil of the paramount frequency power transformer T1 of filtering input through current rectifying and wave filtering circuit, and
Also it is controlled with concussion IC control circuits, the primary side feedback circuit being connected with concussion IC control circuits is also concussion IC control electricity
Concussion IC chip U1 in road provides running voltage, and defeated with the synchronous rectification that the secondary output winding of high frequency transformer T1 is connected
Go out circuit and the power supply after transformation is synchronized into rectification, to improve the ability of electric current output and the efficiency of conversion, and can also drop
The temperature of low concussion IC chip U1 and rectification IC chip U2.
In present embodiment, in the concussion IC control circuits, the 7th electric capacity C7 is Absorption Capacitance, and 3rd resistor R3 is suction
Receive resistance, the other end of the 7th electric capacity C7 and the other end of 3rd resistor R3 are connected to one end of first resistor R1, described first
The other end of resistance R1 is connected as the negative pole of the first diode D1 of absorption diode, and the positive pole of the first diode D1 is connected to height
4th pin of the primary main coil of frequency power transformer T1, shake IC chip U1 the 4th pin be current limliting end, remaining the 5th resistance
R5, the 6th resistance R6, one end of the 7th resistance R7, the 3rd pin for shaking IC chip U1 is feedback end, its connection most partial pressure
Tenth resistance R10 of resistance and the junction of the 9th resistance R9.
In present embodiment, in the synchronous rectification output circuit, the first pin of rectification IC chip U2 is input, its
The tenth pin of the secondary output winding of high frequency transformer T1 is connected to, the 5th pin of rectification IC chip U2 is rectification control
End, it is connected to the 9th pin of the secondary output winding of high frequency transformer T1, and the second pin of rectification IC chip U2 is power
Pipe end, it is connected with the other end of the 14th resistance R14 for absorption resistance, and the 3rd pin of rectification IC chip U2 is current limliting
End, it is connected with the one end for current-limiting resistance R13, and the 4th pin of rectification IC chip U2 is power end, its with for filter capacitor
The tenth electric capacity C10 one end connection.
Protection scope of the present invention includes but is not limited to embodiment of above, and protection scope of the present invention is with claims
It is defined, any replacement being readily apparent that to those skilled in the art that this technology is made, deformation, improvement each fall within the present invention's
Protection domain.
Claims (10)
1. circuit of synchronous rectification, it is characterised in that：Including power supply input circuit, current rectifying and wave filtering circuit, concussion IC control circuits, original
Side feedback circuit, high frequency transformer and synchronous rectification output circuit；The current rectifying and wave filtering circuit connection power supply input circuit is defeated
The electric current for entering carries out rectifying and wave-filtering, and the high frequency transformer includes primary main coil, primary secondary coil and secondary output winding, institute
State the primary main coil that current rectifying and wave filtering circuit connects respectively concussion IC control circuits and high frequency transformer, the primary side feedback circuit
It is connected with the primary secondary coil of concussion IC control circuits and high frequency transformer respectively and provides work electricity to shake IC control circuits
Pressure, the secondary output winding connection synchronous rectification output circuit of the high frequency transformer.
2. circuit of synchronous rectification according to claim 1, it is characterised in that：The power supply input circuit is input into including live wire
End（L）, zero line input（N）, common mode inductance（LF1）With bridge heap integrated package（BD1）, the live wire input（L）Connection common mode
Inductance（LF1）The 4th foot, the zero line input（N）Connection common mode inductance（LF1）Crus secunda, the common mode inductance
（LF1）The 3rd foot cross structure heap integrated package（BD1）Crus secunda, the common mode inductance（LF1）The first foot cross structure heap
In bulk（BD1）The first foot, the bridge heap integrated package（BD1）The 3rd foot connect power supply ground, the bridge heap integrated package（BD1）
Four feet connect current rectifying and wave filtering circuit.
3. circuit of synchronous rectification according to claim 2, it is characterised in that：The live wire input（L）And common mode inductance
（LF1）The 4th foot between be in series with electric fuse（F1）.
4. circuit of synchronous rectification according to claim 2, it is characterised in that：The current rectifying and wave filtering circuit includes the first electric capacity
（C1）, the second electric capacity（C2）, the second inductance（L2）With the 3rd electric capacity（C3）, the power supply input circuit jackshaft heap integrated package
（BD1）The 4th foot connect the first electric capacity（C1）One end, first electric capacity（C1）One end be also connected with the second inductance（L2）
One end, second inductance（L2）The other end connect the second electric capacity（C2）One end, second electric capacity（C2）One end
It is also connected with the 3rd electric capacity（C3）One end, first electric capacity（C1）With the second electric capacity（C2）And the 3rd electric capacity（C3）It is another
End all connects power supply ground；3rd electric capacity（C3）One end be further connected to the primary main coil of high frequency transformer and the 5th draw
Foot and concussion IC control circuits.
5. circuit of synchronous rectification according to claim 4, it is characterised in that：The concussion IC control circuits include that the 7th is electric
Hold（C7）, the 8th electric capacity（C8）, 3rd resistor（R3）, first resistor（R1）, the first diode（D1）, concussion IC chip（U1）、
5th resistance（R5）, the 6th resistance（R6）, the 7th resistance（R7）, the 9th resistance（R9）With the tenth resistance（R10）；The rectification filter
3rd electric capacity in wave circuit（C3）One end connect the 7th electric capacity（C7）One end, the 7th electric capacity（C7）One end be also connected with
3rd resistor（R3）One end, the 3rd resistor（R3）One end be additionally coupled to high frequency transformer primary main coil the 5th
Pin, the 7th electric capacity（C7）The other end connection 3rd resistor（R3）The other end, the 7th electric capacity（C7）It is another
End is also connected with first resistor（R1）One end, the first resistor（R1）The other end connect the first diode（D1）Negative pole,
First diode（D1）Positive pole be connected to high frequency transformer primary main coil the 4th pin, the concussion IC chip
（U1）The 5th pin, the 6th pin, the 7th pin and the 8th pin be connected with each other and be connected to high frequency transformer primary it is main
4th pin of coil, the concussion IC chip（U1）The first pin connect power supply ground, the concussion IC chip（U1）The 4th
Pin connects the 5th resistance（R5）One end, the 5th resistance（R5）One end connect the 6th resistance（R6）One end, it is described
6th resistance（R6）One end connect the 7th resistance（R7）One end, the 5th resistance（R5）, the 6th resistance（R6）With the 7th
Resistance（R7）The other end all connect power supply ground；The concussion IC chip（U1）The 3rd pin connect the tenth resistance（R10）One
End, the tenth resistance（R10）Another termination power ground, the tenth resistance（R10）8th electric capacity also in parallel（C8）, it is described
Tenth resistance（R10）One end be also connected with the 9th resistance（R9）One end, the 9th resistance（R9）The other end connection it is paramount
First pin of the primary secondary coil of frequency power transformer, the first pin of the primary secondary coil of the high frequency transformer is also associated with original
Side feedback circuit.
6. circuit of synchronous rectification according to claim 1, it is characterised in that：The primary secondary coil of the high frequency transformer
3rd pin connects power supply ground, and the 3rd pin of the primary secondary coil of the high frequency transformer is also associated with being spaced electric capacity（CY1）'s
One end, the interval electric capacity（CY1）Another termination output negative pole end（V0-）.
7. circuit of synchronous rectification according to claim 5, it is characterised in that：The primary side feedback circuit includes the two or two pole
Pipe（D2）, the 8th resistance（R8）With the 6th electric capacity（C6）, the first pin connection the of the primary secondary coil of the high frequency transformer
Two diodes（D2）Positive pole, second diode（D2）Negative pole connection concussion IC chip（U1）Second pin, it is described
Concussion IC chip（U1）Second pin be also connected with the 6th electric capacity（C6）One end, the 6th electric capacity（C6）Another termination electricity
Source ground.
8. circuit of synchronous rectification according to claim 1, it is characterised in that：The synchronous rectification output circuit includes rectification
IC chip（U2）, the 4th electric capacity（C4）, the 5th electric capacity（C5）, the 9th electric capacity（C9）, the tenth electric capacity（C10）, the 12nd resistance
（R12）, the 13rd resistance（R13）, the 14th resistance（R14）, the 15th resistance（R15）, the 16th resistance（R16）, the 20th
One resistance（R21）, the 26th resistance（R26）, the first USB port（USB1）, the second USB port（USB3）, the 3rd USB port
（USB3）, output cathode end（V0+）With output negative pole end（V0-）；The tenth of the secondary output winding of the high frequency transformer draws
Foot is connected to rectification IC chip（U2）The first pin, the rectification IC chip（U2）The first pin be also connected with the 4th electric capacity
（C4）One end, the 4th electric capacity（C4）One end be also connected with the 5th electric capacity（C5）One end, the 5th electric capacity（C5）'s
One end is also connected with the 15th resistance（R15）One end, the 15th resistance（R15）One end be also connected with output cathode end（V0
+）, the rectification IC chip（U2）The 6th pin, the 7th pin, the 8th pin and the 4th electric capacity（C4）The other end,
Five electric capacity（C5）The other end, the 15th resistance（R15）The other end all connect output negative pole end（V0-）；The rectification IC chip
（U2）The 5th pin be connected to the 14th resistance（R14）One end, the 14th resistance（R14）The other end be connected to it is whole
Stream IC chip（U2）Second pin, the rectification IC chip（U2）The 5th pin be also connected with the secondary output of high frequency transformer
9th pin of coil, the 14th resistance（R14）One end be also connected with the 9th electric capacity（C9）One end, the 9th electric capacity
（C9）The other end connect the 12nd resistance（R12）One end, the 12nd resistance（R12）The other end connection output negative pole
End（V0-）；The rectification IC chip（U2）The 3rd pin connect the 13rd resistance（R13）One end, the 13rd resistance
（R13）Another termination output negative pole end（V0-）, the rectification IC chip（U2）The 4th pin connect the tenth electric capacity（C10）
One end, the tenth electric capacity（C10）Another termination output negative pole end（V0-）；16th resistance（R16）One end,
21st resistance（R21）One end and the 26th resistance（R26）One end all connect output negative pole end（V0-）, the described tenth
Six resistance（R16）The other end connect the first USB port（USB1）, the 21st resistance（R21）Other end connection the
Two USB ports（USB2）, the 26th resistance（R26）The other end connect the 3rd USB port（USB3）.
9. circuit of synchronous rectification according to claim 8, it is characterised in that：The rectification IC chip（U2）Model
PN8305, the 4th electric capacity（C4）With the 5th electric capacity（C5）All it is polarized electric capacity, the 13rd resistance（R13）With the tenth
Five resistance（R15）For current-limiting resistance, the 12nd resistance（R12）With the 14th resistance（R14）For absorption resistance.
10. circuit of synchronous rectification according to claim 5, it is characterised in that：The concussion IC chip（U1）Model
PN8386, the 9th resistance（R9）With the tenth resistance（R10）For divider resistance, the 5th resistance（R5）, the 6th resistance
（R6）With the 7th resistance（R7）All it is current-limiting resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611188157.7A CN106655815A (en) | 2016-12-21 | 2016-12-21 | Synchronous rectification circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611188157.7A CN106655815A (en) | 2016-12-21 | 2016-12-21 | Synchronous rectification circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106655815A true CN106655815A (en) | 2017-05-10 |
Family
ID=58834311
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611188157.7A Pending CN106655815A (en) | 2016-12-21 | 2016-12-21 | Synchronous rectification circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106655815A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201349179Y (en) * | 2009-01-08 | 2009-11-18 | 美的集团有限公司 | Switching power supply circuit of pulping machine |
| CN202068337U (en) * | 2011-02-21 | 2011-12-07 | 上海博湃电子科技有限公司 | Auxiliary power supply for three-phase intelligent ammeter |
| CN203788132U (en) * | 2014-04-04 | 2014-08-20 | 广州勒夫蔓德电器有限公司 | Switch power supply |
| CN206775402U (en) * | 2016-12-21 | 2017-12-19 | 江西佰仕通电子科技有限公司 | Circuit of synchronous rectification |
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2016
- 2016-12-21 CN CN201611188157.7A patent/CN106655815A/en active Pending
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|---|---|---|---|---|
| CN201349179Y (en) * | 2009-01-08 | 2009-11-18 | 美的集团有限公司 | Switching power supply circuit of pulping machine |
| CN202068337U (en) * | 2011-02-21 | 2011-12-07 | 上海博湃电子科技有限公司 | Auxiliary power supply for three-phase intelligent ammeter |
| CN203788132U (en) * | 2014-04-04 | 2014-08-20 | 广州勒夫蔓德电器有限公司 | Switch power supply |
| CN206775402U (en) * | 2016-12-21 | 2017-12-19 | 江西佰仕通电子科技有限公司 | Circuit of synchronous rectification |
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