CN206775402U - Circuit of synchronous rectification - Google Patents
Circuit of synchronous rectification Download PDFInfo
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- CN206775402U CN206775402U CN201621405075.9U CN201621405075U CN206775402U CN 206775402 U CN206775402 U CN 206775402U CN 201621405075 U CN201621405075 U CN 201621405075U CN 206775402 U CN206775402 U CN 206775402U
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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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Abstract
The utility model discloses circuit of synchronous rectification, including power supply input circuit, current rectifying and wave filtering circuit, 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 carries out rectifying and wave-filtering for the electric current of input, the high frequency transformer includes primary main coil, primary secondary coil and secondary output winding, the current rectifying and wave filtering circuit connects the primary main coil of concussion IC control circuits and high frequency transformer respectively, the primary side feedback circuit is connected with the primary secondary coil of concussion IC control circuits and high frequency transformer and provides operating voltage, the secondary output winding connection synchronous rectification output circuit of the high frequency transformer for concussion IC control circuits respectively；Synchronous rectification output circuit instead of secondary commutation Schottky diode, improve current output capability, lifts conversion efficiency and reduces IC temperature.
Description
Technical field
It the utility model is related to charging circuit field, and in particular to circuit of synchronous rectification.
Background technology
Mains charger is many families such as a kind of housed device, mobile phone, computer, electric car commonly used in people's daily life
Electrical appliance can all use and arrive charger；The pattern of existing charger and had nothing in common with each other using object, but existing charger uses more
The use of discrete component, a large amount of discrete components causes high processing costs, complex process to cause the repair rate of product higher, electric in addition
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, lifting conversion efficiency are low.
Utility model content
The purpose of this utility model is to provide that a kind of production cost is low, circuit reliability is high and low-power consumption and electric current output
Ability is high, high conversion efficiency and the circuit of synchronous rectification that can reduce IC temperature.
The utility model is achieved through the following technical solutions：Circuit of synchronous rectification, including power supply input circuit, rectifying and wave-filtering
Circuit, concussion IC control circuits, primary side feedback circuit, high frequency transformer and synchronous rectification output circuit；The rectifying and wave-filtering electricity
Road connection power supply input circuit carries out rectifying and wave-filtering for the electric current of input, and the high frequency transformer includes primary main coil, primary
Secondary coil and secondary output winding, the current rectifying and wave filtering circuit connect concussion IC control circuits and the primary of high frequency transformer respectively
Main coil, the primary side feedback circuit are connected with the primary secondary coil of concussion IC control circuits and high frequency transformer and are shake respectively
Swing IC control circuits and operating voltage, the secondary output winding connection synchronous rectification output circuit of the high frequency transformer are provided；Institute
Stating power supply input circuit includes live wire input, zero line input, common mode inductance and bridge heap integrated package, and the live wire input connects
The 4th pin of common mode inductance, the crus secunda of the zero line input connection common mode inductance are connect, the 3rd pin of the common mode inductance connects
The crus secunda of bridge heap integrated package, the first pin of the first pin connecting bridge heap integrated package of the common mode inductance are connect, the bridge heap integrates
With connecing power supply, the 4th pin of the bridge heap integrated package connects current rectifying and wave filtering circuit to 3rd pin of block；The live wire input and common mode
Fuse is in series between 4th pin of inductance；The current rectifying and wave filtering circuit include the first electric capacity, the second electric capacity, the second inductance and
3rd electric capacity, the 4th pin of the power supply input circuit jackshaft heap integrated package connect one end of the first electric capacity, first electric capacity
One end be also connected with one end of the second inductance, the other end of second inductance connects one end of the second electric capacity, second electricity
One end of appearance is also connected with one end of the 3rd electric capacity, and first electric capacity and the other end of the second electric capacity and the 3rd electric capacity all connect electricity
Source；One end of 3rd electric capacity is further connected to the 5th pin and the concussion IC controls of the primary main coil of high frequency transformer
Circuit processed；The concussion IC control circuits include the 7th electric capacity, the 8th electric capacity, 3rd resistor, first resistor, the first diode,
Shake IC chip, the 5th resistance, the 6th resistance, the 7th resistance, the 9th resistance and the tenth resistance；In the current rectifying and wave filtering circuit
One end of three 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 described the
One end of three 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 other end of 3rd resistor, the other end of the 7th electric capacity are also connected with one end of first resistor, the first resistor it is another
The negative pole of the first diode of end connection, the positive pole of first diode are connected to the 4th of the primary main coil of high frequency transformer
Pin, the 5th pin, the 6th pin, the 7th pin and the 8th pin of the concussion IC chip are connected with each other and connect tremendously high frequency
4th pin of the primary main coil of transformer, it is described concussion IC chip the first pin with connecing power supply, the concussion IC chip
The 4th pin connect one end of the 5th resistance, one end of the 5th resistance connects one end of the 6th resistance, the 6th electricity
One end of resistance connects one end of the 7th resistance, and the other end of the 5th resistance, the 6th resistance and the 7th resistance is with all connecing power supply；
One end of the 3rd pin the tenth resistance of connection of the concussion IC chip, another termination power of the tenth resistance, it is described
Tenth resistance the 8th electric capacity also in parallel, one end of the tenth resistance are also connected with one end of the 9th resistance, the 9th resistance
The other 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
Pin is also associated with primary side feedback circuit；3rd pin of the primary secondary coil of the high frequency transformer with connecing power supply, the height
3rd pin of the primary secondary coil of frequency power transformer is also associated with being spaced one end of electric capacity, and another termination of the interval electric capacity is defeated
Go out negative pole end；The primary side feedback circuit includes the second diode, the 8th resistance and the 6th electric capacity, the high frequency transformer just
First pin of level secondary coil connects the positive pole of the second diode, and the of the negative pole connection concussion IC chip of second diode
Two pins, the second pin of the concussion IC chip are also connected with one end of the 6th electric capacity, another termination electricity of the 6th electric capacity
Source；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,
12nd resistance, the 13rd resistance, the 14th resistance, the 15th resistance, the 16th resistance, the 21st resistance, the 26th
Resistance, the first USB port, the second USB port, the 3rd USB port, output cathode end and output negative pole end；The high frequency transformation
Tenth pin of the secondary output winding of device is connected to the first pin of rectification IC chip, the first pin of the rectification IC chip
It is also connected with 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, and the one of the 5th electric capacity
End is also connected with one end of the 15th resistance, and one end of the 15th resistance is also connected with output cathode end, the rectification IC chip
The 6th pin, the 7th pin, the other end, the other end, the 15th resistance of the 5th electric capacity of the 8th pin and the 4th electric capacity
The other end all connect output negative pole end；5th pin of the rectification IC chip is connected to one end of the 14th resistance, and described
The other end of 14 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
9th pin of the secondary output winding of transformer, one end of the 14th resistance is also connected with one end of the 9th electric capacity, described
The other end of 9th electric capacity connects one end of the 12nd resistance, the other end connection output negative pole end of the 12nd resistance；Institute
The 3rd pin for stating rectification IC chip connects one end of the 13rd resistance, another termination output negative pole of the 13rd resistance
End, the 4th pin of the rectification IC chip connect one end of the tenth electric capacity, another termination output negative pole of the tenth electric capacity
End；One end, one end of the 21st resistance and one end of the 26th resistance of 16th resistance all connect output negative pole end,
The other end of 16th resistance connects the first USB port, and the other end of the 21st resistance connects the 2nd USB ends
Mouthful, the other end of the 26th resistance connects the 3rd USB port；The model PN8305 of the rectification IC chip, it is 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, described
12 resistance and the 14th resistance are absorption resistance；The model PN8386 of the concussion IC chip, the 9th resistance and the
Ten resistance are divider resistance, and the 5th resistance, the 6th resistance and the 7th resistance are all current-limiting resistance.
The utility model include power supply input circuit, current rectifying and wave filtering circuit, 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 carried out for the electric current of input
Rectifying and wave-filtering, the high frequency transformer include primary main coil, primary secondary coil and secondary output winding, the rectifying and wave-filtering electricity
Road connects the primary main coil of concussion IC control circuits and high frequency transformer respectively, and the primary side feedback circuit is respectively with shaking IC
Control circuit connects with the primary secondary coil of high frequency transformer and provides operating voltage for concussion IC control circuits, and the high frequency becomes
The secondary output winding connection synchronous rectification output circuit of depressor；Synchronous rectification output circuit instead of secondary commutation Schottky two
Pole pipe, current output capability is improved, lift conversion efficiency and reduce IC temperature.
It is of the present utility model to be beneficial in that：1）Circuit reduction is practical, simple in construction, and reliability improves；2）Improve electricity
Linear and load regulation, reduce energy consumption；3）Improve current output capability and conversion efficiency；4）Reduce IC temperature.
Brief description of the drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
Below in conjunction with the accompanying drawings with embodiment, the utility model is further described.
See Fig. 1, circuit of synchronous rectification, including power supply input circuit, current rectifying and wave filtering circuit, 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 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 the primary main coil of concussion IC control circuits and high frequency transformer, the primary side feedback circuit point respectively
It is not connected with the primary secondary coil of concussion IC control circuits and high frequency transformer and provides operating voltage for concussion IC control circuits,
The secondary output winding connection synchronous rectification output circuit of the high frequency transformer；The power supply input circuit inputs including live wire
Hold L, zero line input N, the of common mode inductance LF1 and bridge heap integrated package BD1, the live wire input L connection common mode inductances LF1
Four pin, the crus secunda of the zero line input N connection common mode inductances LF1, the 3rd pin connecting bridge of the common mode inductance LF1 heap
Blocking BD1 crus secunda, the first pin connecting bridge heap integrated package BD1 of the common mode inductance LF1 the first pin, the bridge heap integrate
With connecing power supply, the 4th pin of the bridge heap integrated package BD1 connects current rectifying and wave filtering circuit to block BD1 the 3rd pin；The live wire input L
Fuse F1 is in series between common mode inductance LF1 the 4th pin；The current rectifying and wave filtering circuit includes the first electric capacity C1, the second electricity
Hold C2, the second inductance L2 and the 3rd electric capacity C3, the power supply input circuit jackshaft heap integrated package BD1 electricity of the 4th pin connection first
Hold C1 one end, one end of the first electric capacity C1 is also connected with the second inductance L2 one end, the other end of the second inductance L2
The second electric capacity C2 one end is connected, one end of the second electric capacity C2 is also connected with the 3rd electric capacity C3 one end, first electric capacity
C1 and the second electric capacity C2 and the 3rd electric capacity the C3 other end are with all connecing power supply；One end of the 3rd electric capacity C3 is also respectively connected with
The 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 the 7th electric capacity C7 one end, and one end of the 7th electric capacity C7 is also connected with 3rd resistor R3 one end, and the described 3rd
Resistance R3 one end 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 3rd resistor R3 other end is connect, the other end of the 7th electric capacity C7 is also connected with first resistor R1 one end, first electricity
The other end for hindering R1 connects the first diode D1 negative pole, 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 for shaking 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 the concussion IC chip U1 connects power supply
Ground, the 4th pin of the concussion IC chip U1 connect the 5th resistance R5 one end, one end connection of the 5th resistance R5 the
Six resistance R6 one end, one end of the 6th resistance R6 connect the 7th resistance R7 one end, the 5th resistance R5, the 6th electricity
Hinder R6 and the 7th resistance R7 other end with all connecing power supply；The 3rd pin of the concussion IC chip U1 connects the tenth resistance R10
One end, another termination power of the tenth resistance R10, the tenth resistance R10 also the 8th electric capacity C8 of parallel connection, described
Ten resistance R10 one end is also connected with the 9th resistance R9 one end, 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 with connecing power supply, the primary secondary coil of the high frequency transformer
3rd pin is also associated with being spaced electric capacity CY1 one end, 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 second diode D2 positive pole, and the of the negative pole connection concussion IC chip U1 of the second diode D2
Two pins, the second pin of the concussion IC chip U1 are also connected with the 6th electric capacity C6 one end, and the 6th electric capacity C6's is another
Termination power；The synchronous rectification output circuit includes rectification IC chip U2, the 4th electric capacity C4, the 5th electric capacity C5, the 9th electricity
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 rectification IC chip U2 the first pin, and the first pin of the rectification IC chip U2 is also connected with the 4th electric capacity C4's
One end, one end of the 4th electric capacity C4 are also connected with the 5th electric capacity C5 one end, and one end of the 5th electric capacity C5 is also connected with
15 resistance R15 one end, one end of the 15th resistance R15 are 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 the C4 other end, the 5th electric capacity C5 other end, the 15th
The resistance R15 other end all meets output negative pole end V0-；The 5th pin of the rectification IC chip U2 is connected to the 14th resistance
R14 one end, the other end of the 14th resistance R14 are connected to rectification IC chip U2 second pin, the rectification IC cores
Piece U2 the 5th pin 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 the 9th electric capacity C9 one end, and the other end of the 9th electric capacity C9 connects the 12nd resistance R12 one end, and described the
12 resistance R12 other end connection output negative pole end V0-；The 3rd pin of the rectification IC chip U2 connects the 13rd resistance
R13 one end, another termination output negative pole end V0- of the 13rd resistance R13, the 4th pin of the rectification IC chip U2
Connect the tenth electric capacity C10 one end, another termination output negative pole end V0- of the tenth electric capacity C10；16th resistance
One end of R16 one end, the 21st resistance R21 one end and the 26th resistance R26 all meets output negative pole end V0-, described
The 16th resistance R16 other end connects the first USB port USB1, the other end connection second of the 21st resistance R21
USB port USB3, the 26th resistance R26 other end connect the 3rd USB port USB3；The rectification IC chip U2's
Model PN8305, the 4th electric capacity C4 and the 5th electric capacity C5 are 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
U1 model PN8386, the 9th resistance R9 and the tenth resistance R10 is divider resistance, the 5th resistance R5, the 6th electricity
It is all current-limiting resistance to hinder R6 and the 7th resistance R7.
The 7th of main winding is connected in present embodiment, after 4 SW pins interconnection of the first chip U1 to draw
Pin, and also absorbed by the clamp circuit of first resistor R1,3rd resistor R3, the 7th electric capacity C7 and the first diode D1 composition
The 8th pin after drain-source end spike voltage inside first chip U1 with main winding is connected with each other.
In present embodiment, fuse F1 is in series between the 4th pin of the live wire input L and common mode inductance LF1,
Inputted for protection power source excessive；Power network from live wire input L and zero line input N input powers, by 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 by 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 operating voltage, and the synchronous rectification being connected with high frequency transformer T1 secondary output winding is defeated
Go out circuit and the power supply after transformation is synchronized into rectification, to improve the efficiency of the ability of electric current output and conversion, and can also drop
Low concussion IC chip U1 and rectification IC chip U2 temperature.
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 7th electric capacity C7 other end and the 3rd resistor R3 other end are connected to first resistor R1 one end, and described first
The resistance R1 other end is connected as the first diode D1 of absorption diode negative pole, and the first diode D1 positive pole is connected to height
4th pin of frequency power transformer T1 primary main coil, concussion IC chip U1 the 4th pin are current limliting end, remaining the 5th resistance
R5, the 6th resistance R6, the 7th resistance R7 one end, concussion IC chip U1 the 3rd pin is feedback end, and it connects most partial pressure
Tenth resistance R10 of resistance and the 9th resistance R9 junction.
In present embodiment, in the synchronous rectification output circuit, rectification IC chip U2 the first pin is input, its
The tenth pin of high frequency transformer T1 secondary output winding is connected to, rectification IC chip U2 the 5th pin controls for rectification
End, it is connected to the 9th pin of high frequency transformer T1 secondary output winding, and rectification IC chip U2 second pin is power
Pipe end, it is connected with the other end of the 14th resistance R14 for absorption resistance, and rectification IC chip U2 the 3rd pin is current limliting
End, it is connected with for current-limiting resistance R13 one end, and rectification IC chip U2 the 4th pin is power end, its with for filter capacitor
The tenth electric capacity C10 one end connection.
The scope of protection of the utility model includes but is not limited to embodiment of above, and the scope of protection of the utility model is to weigh
Sharp claim is defined, and any replacement being readily apparent that to those skilled in the art that this technology is made, deformation, improvement are each fallen within
The scope of protection of the utility model.
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 entered 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 concussion IC control circuits and high frequency transformer respectively, the primary side feedback circuit
It is connected respectively with the primary secondary coil of concussion IC control circuits and high frequency transformer and provides work electricity for concussion 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 inputs including live wire
End（L）, zero line input（N）, common mode inductance（LF1）With bridge heap integrated package（BD1）, the live wire input（L）Connect common mode
Inductance（LF1）The 4th pin, the zero line input（N）Connect common mode inductance（LF1）Crus secunda, the common mode inductance
（LF1）The 3rd pin connecting bridge heap integrated package（BD1）Crus secunda, the common mode inductance（LF1）The first pin connecting bridge heap
It is blocking（BD1）The first pin, the bridge heap integrated package（BD1）The 3rd pin with connecing power supply, the bridge heap integrated package（BD1）
Four pin 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 pin between be in series with 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 pin 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 is with all connecing power supply；3rd electric capacity（C3）One end be further connected to the primary main coil of high frequency transformer and the 5th draw
Pin 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 the 7th electricity
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 with connecing power supply, 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 with all connecing power supply；The concussion IC chip（U1）The 3rd pin connect the tenth resistance（R10）One
End, the tenth resistance（R10）Another termination power, 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 are 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
With connecing power supply, the 3rd pin of the primary secondary coil of the high frequency transformer is also associated with being spaced electric capacity 3rd pin（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
Shake 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.
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
Pin 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
Flow 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.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621405075.9U CN206775402U (en) | 2016-12-21 | 2016-12-21 | Circuit of synchronous rectification |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621405075.9U CN206775402U (en) | 2016-12-21 | 2016-12-21 | Circuit of synchronous rectification |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106655815A (en) * | 2016-12-21 | 2017-05-10 | 江西佰仕通电子科技有限公司 | Synchronous rectification circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106655815A (en) * | 2016-12-21 | 2017-05-10 | 江西佰仕通电子科技有限公司 | Synchronous rectification circuit |
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Granted publication date: 20171219 Termination date: 20181221 |