CN206595898U - Secondary inverse-excitation type switch power-supply based on SP6650 - Google Patents
Secondary inverse-excitation type switch power-supply based on SP6650 Download PDFInfo
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- CN206595898U CN206595898U CN201720295226.8U CN201720295226U CN206595898U CN 206595898 U CN206595898 U CN 206595898U CN 201720295226 U CN201720295226 U CN 201720295226U CN 206595898 U CN206595898 U CN 206595898U
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The utility model provides a kind of secondary inverse-excitation type switch power-supply based on SP6650, including：Current rectifying and wave filtering circuit, transformer T1, power supply control chip U1, NMOS tube Q1, optocoupler U2, reference voltage source U3；Power supply control chip U1 uses SP6650；Inverse-excitation type switch power-supply of the utility model relative to primary side; optocoupler U2 collocation reference voltage sources U3 is passed through using the flyback switching voltage of secondary; because optocoupler U2 plays the role of Phototube Coupling in itself; so it can play a part of to primary and secondary electrical isolation in Switching Power Supply; but also the effect breakdown not because of overburden of the power tube of chip internal can be protected; reference voltage source U3 can provide relatively stable reference voltage again so that more preferable stability can be reached when secondary voltage feeds back to primary.Optocoupler and reference voltage source are used in secondary circuit, reaches that sampling is accurate so that the more stable effect of output voltage.
Description
Technical field
The utility model is related to a kind of Switching Power Supply, especially a kind of secondary inverse-excitation type switch power-supply.
Background technology
SP6650 is a high-performance, the pwm chip of multi-operation mode.Chip can be operated in frequency hopping and green mould
Formula, reduces loss during unloaded and underloading with this, can also be operated in QR mode of operations and CCM mode of operations, improves complete machine
Operating efficiency.SP6650 only needs to the electric current of very little in startup and work, can be in start-up circuit using one very big
Resistance, power consumption during with this further to reduce standby.A variety of protections built in SP6650, including：The too low protection of input voltage
（Brown-out）, output voltage short-circuit protection, VDD overvoltage protections（OVP）, VDD overvoltage clamps, VDD under-voltage protections（UVLO）,
Overheat protector（OTP）Deng.Therefore, it is more satisfactory scheme to design a kind of Switching Power Supply based on SP6650.
The content of the invention
The purpose of this utility model is to provide a kind of secondary inverse-excitation type switch power-supply based on SP6650, can reach and adopt
Sample is accurate so that the more stable effect of output voltage.The technical solution adopted in the utility model is：
A kind of secondary inverse-excitation type switch power-supply based on SP6650, including：
Current rectifying and wave filtering circuit, transformer T1, power supply control chip U1, NMOS tube Q1, optocoupler U2, reference voltage source U3；Electricity
Source control chip U1 uses SP6650；
The positive output termination transformer T1 primary Np of current rectifying and wave filtering circuit first end, and resistance R3 one end, electric capacity C4
One end and resistance R4 one end；The primary ground of negative output termination of current rectifying and wave filtering circuit；Primary Np the second terminating diode
The drain electrode of D7 anodes and NMOS tube Q1, diode D7 negative electrodes meet electric capacity C4 and the resistance R4 other ends；Transformer assists winding Naux
The first terminating resistor R1 one end and resistance R5 one end, resistance R5 another terminating diode D6 anode, diode D6
Negative electrode connecting resistance R3 the other end and power supply control chip U1 power input, and electric capacity C2 positive pole, electric capacity C2's
Negative pole connects primary ground；NMOS tube Q1 grid connecting resistance R6 one end and diode D5 anode, the resistance R6 other end and two
Pole pipe D5 negative electrode connects power supply control chip U1 drive output；NMOS tube Q1 source electrode connecting resistance R7 one end and resistance R8
One end, the primary ground of resistance R8 another termination；Resistance R7 another termination power supply control chip U1 current sampling end and electricity
Hold C3 one end；The primary ground of electric capacity C3 another termination；Resistance R1 another terminating resistor R2 one end and power supply control chip
U1 demagnetization terminates sense terminal, the resistance R2 primary ground of another termination；The power supply control chip U1 primary ground of ground connection termination；
T1 level Ns of transformer the first terminating diode D8 anodes, diode D8 negative electrode connects electric capacity C6 one end and electricity
Hinder R9 one end, and resistance R12 and R10 one end；The electric capacity C6 other end, the resistance R9 other end and transformer T1 times
Level Ns the second termination secondary ground；Transformer assists winding Naux the second termination secondary ground；Resistance R12 another termination optocoupler
U2 inputs anode and resistance R13 one end, another termination optocoupler U2 inputs negative electrodes of resistance R13 and electric capacity C7 one end and benchmark
Voltage source U3 anode；The electric capacity C7 other end passes through the resistance R14 connecting resistances R10 other end and resistance R11 one end；Resistance
R11 one end is also connected with reference voltage source U3 reference pole；The resistance R11 other end and reference voltage source U3 anode connect secondary
Ground；Optocoupler U2 output end colelctor electrode connects electric capacity C5 one end and power supply control chip U1 feedback end；The electric capacity C5 other end
Primary ground is connect with optocoupler output emitter stage；
Transformer T1 primary Np second ends, secondary Ns first ends and assists winding Naux first ends are Same Name of Ends.
Further, current rectifying and wave filtering circuit includes diode D1~D4, electric capacity C1；Diode D1~D4 composition rectifier bridges,
C1 is connected in parallel on two output ends of rectifier bridge.
Further, optocoupler U2 uses PC817；Reference voltage source U3 uses TL431.
The utility model has the advantage of：Relative to the inverse-excitation type switch power-supply of primary side, using the flyback switching of secondary
Voltage is by optocoupler U2 collocation reference voltage source U3, because optocoupler U2 plays the role of Phototube Coupling in itself, so in Switching Power Supply
In it can play a part of to primary and secondary electrical isolation, but also the power tube of chip internal can be protected not because of overburden
Breakdown effect, reference voltage source U3 can provide relatively stable reference voltage again so that be fed back to just in secondary voltage
More preferable stability can be reached during level.Optocoupler and reference voltage source are used in secondary circuit, reaches that sampling is accurate so that output electricity
The more stable effect of pressure.
Brief description of the drawings
Fig. 1 is electrical schematic diagram of the present utility model.
Embodiment
With reference to specific drawings and examples, the utility model is described in further detail.
As shown in figure 1, the secondary inverse-excitation type switch power-supply based on SP6650, including：
Current rectifying and wave filtering circuit, transformer T1, power supply control chip U1, NMOS tube Q1, optocoupler U2, reference voltage source U3；Electricity
Source control chip U1 uses SP6650；Optocoupler U2 uses PC817；Reference voltage source U3 uses TL431；
Power supply control chip U1 each pin is as follows：
FB：Feedback end；
DEM：Demagnetization terminates sense terminal；
CS：Current sampling end；
GATE：Drive output；
GND：Earth terminal；
VDD：Power input；
The positive output termination transformer T1 primary Np of current rectifying and wave filtering circuit first end, and resistance R3 one end, electric capacity C4
One end and resistance R4 one end；The primary ground of negative output termination of current rectifying and wave filtering circuit；Primary Np the second terminating diode
The drain electrode of D7 anodes and NMOS tube Q1, diode D7 negative electrodes meet electric capacity C4 and the resistance R4 other ends；Transformer assists winding Naux
The first terminating resistor R1 one end and resistance R5 one end, resistance R5 another terminating diode D6 anode, diode D6
Negative electrode connecting resistance R3 the other end and power supply control chip U1 power input, and electric capacity C2 positive pole, electric capacity C2's
Negative pole connects primary ground；NMOS tube Q1 grid connecting resistance R6 one end and diode D5 anode, the resistance R6 other end and two
Pole pipe D5 negative electrode connects power supply control chip U1 drive output；NMOS tube Q1 source electrode connecting resistance R7 one end and resistance R8
One end, the primary ground of resistance R8 another termination；Resistance R7 another termination power supply control chip U1 current sampling end and electricity
Hold C3 one end；The primary ground of electric capacity C3 another termination；Resistance R1 another terminating resistor R2 one end and power supply control chip
U1 demagnetization terminates sense terminal, the resistance R2 primary ground of another termination；The power supply control chip U1 primary ground of ground connection termination；
T1 level Ns of transformer the first terminating diode D8 anodes, diode D8 negative electrode connects electric capacity C6 one end and electricity
Hinder R9 one end, and resistance R12 and R10 one end；The electric capacity C6 other end, the resistance R9 other end and transformer T1 times
Level Ns the second termination secondary ground；Transformer assists winding Naux the second termination secondary ground；Resistance R12 another termination optocoupler
U2 inputs anode and resistance R13 one end, another termination optocoupler U2 inputs negative electrodes of resistance R13 and electric capacity C7 one end and benchmark
Voltage source U3 anode；The electric capacity C7 other end passes through the resistance R14 connecting resistances R10 other end and resistance R11 one end；Resistance
R11 one end is also connected with reference voltage source U3 reference pole；The resistance R11 other end and reference voltage source U3 anode connect secondary
Ground；Optocoupler U2 output end colelctor electrode connects electric capacity C5 one end and power supply control chip U1 feedback end；The electric capacity C5 other end
Primary ground is connect with optocoupler output emitter stage.
Current rectifying and wave filtering circuit includes diode D1~D4, electric capacity C1；Diode D1~D4 composition rectifier bridges, C1 is connected in parallel on whole
Flow two output ends of bridge；
Transformer T1 primary Np second ends, secondary Ns first ends and assists winding Naux first ends are Same Name of Ends；
Operation principle is as follows：
From the input of high order end alternating current, the rectifier bridge that D1~D4 is made up of four diodes, C1 is filter capacitor, AC ends
Input voltage charged by starting resistance R3 to the electric capacity C2 of VDD pin, the voltage of VDD pin gradually rises, and reaches that chip U1 is opened
Voltage is opened, chip U1 internal electric sources are set up, and internal reference voltage and reference current are also set up therewith, and circuit starts work
Make；
NMOS tube Q1 turns on principle：FB pin can give electric capacity C5 chargings, C5 voltages is increased to high potential, when FB pin voltage liters
Height arrives threshold value（0.77V）When, first time power tube opening signal is produced, GATE pin output pulse signals, NMOS tube Q1 is turned on,
NMOS tube Q1 turns off principle：Cause that electric current rises on primary Np after Q1 conductings, resistance R8 voltages also rise therewith, now
The secondary non-inductive electric current in Ns ends, until the shut-off threshold value that CS pin voltages reach, internal control GATE pin output duty cycles, NMOS tube
Q1 is turned off；Above procedure, makes the transformer T1 continuous charging and dischargings of primary Np, transfers energy to transformer T1 secondary
Ns。
Optocoupler U2 and reference voltage source U3 regulation circuit theories：When output voltage VO UT voltages are gradually risen by 0V, R10,
Two divider resistance sampling VOUT voltages of R11 are contrasted, when less than the 1.25V reference voltage time to U3 with U3 reference voltages 1.25V
Coupling U2 ends, and electric capacity C5 remains in that high potential, and optocoupler U2 is turned on when more than 1.25V, and control C5 voltages decline, so that FB pin
Voltage declines, it is possible to voltage swing on C5 is adjusted by adjusting U3 aperture, so as to adjust GATE pin output duty cycles
And switching frequency, regulation primary Np electric current, so as to adjust secondary Ns electric current, reach the effect of control output voltage size.
Assists winding Naux parts operation principle：Assists winding Naux is that Same Name of Ends is corresponding with secondary windings Ns, its electricity
Pressure is consistent with the sense of current, thus the voltage that secondary windings Ns can be reacted fill can, it is electric that assists winding Naux voltages pass through partial pressure
R1 and R2 is hindered, DEM pin are fed back to, voltage levels can trigger the OVP inside chip U1（Over-voltage protecting function）, Brown-in/
Brown-out (the too small defencive function of input voltage, exit defencive function).
Circuit structure advantage of the present utility model：Relative to the inverse-excitation type switch power-supply of primary side, using the inverse-excitation type of secondary
Switching voltage is by optocoupler U2 collocation reference voltage source U3, because optocoupler U2 plays the role of Phototube Coupling in itself, so in switch
It can play a part of to primary and secondary electrical isolation in power supply, but also can protect the power tube of chip internal not because super negative
Carry and breakdown effect, reference voltage source U3 can provide relatively stable reference voltage again so that in secondary voltage feedback
To more preferable stability can be reached during primary.Optocoupler and reference voltage source are used in secondary circuit, reaches that sampling is accurate so that defeated
Go out the more stable effect of voltage.
Claims (3)
1. a kind of secondary inverse-excitation type switch power-supply based on SP6650, it is characterised in that including：
Current rectifying and wave filtering circuit, transformer T1, power supply control chip U1, NMOS tube Q1, optocoupler U2, reference voltage source U3；Power supply control
Coremaking piece U1 uses SP6650；
The positive output termination transformer T1 primary Np of current rectifying and wave filtering circuit first end, and resistance R3 one end, electric capacity C4 one end
With resistance R4 one end；The primary ground of negative output termination of current rectifying and wave filtering circuit；Primary Np the second terminating diode D7 sun
Pole and NMOS tube Q1 drain electrode, diode D7 negative electrodes meet electric capacity C4 and the resistance R4 other ends；The of transformer assists winding Naux
One terminating resistor R1 one end and resistance R5 one end, resistance R5 another terminating diode D6 anode, diode D6 the moon
The pole connecting resistance R3 other end and power supply control chip U1 power input, and electric capacity C2 positive pole, electric capacity C2 negative pole
Connect primary ground；NMOS tube Q1 grid connecting resistance R6 one end and diode D5 anode, resistance the R6 other end and diode
D5 negative electrode connects power supply control chip U1 drive output；NMOS tube Q1 source electrode connecting resistance R7 one end and the one of resistance R8
End, the resistance R8 primary ground of another termination；Resistance R7 another termination power supply control chip U1 current sampling end and electric capacity C3
One end；The primary ground of electric capacity C3 another termination；Resistance R1 another terminating resistor R2 one end and power supply control chip U1's
Demagnetization terminates sense terminal, the resistance R2 primary ground of another termination；The power supply control chip U1 primary ground of ground connection termination；
T1 level Ns of transformer the first terminating diode D8 anodes, diode D8 negative electrode meets electric capacity C6 one end and resistance R9
One end, and resistance R12 and R10 one end；The electric capacity C6 other end, T1 level Ns of the resistance R9 other end and transformer
Second termination secondary ground；Transformer assists winding Naux the second termination secondary ground；Resistance R12 another termination optocoupler U2 is defeated
Enter Dragon Boat Festival pole and resistance R13 one end, another termination optocoupler U2 inputs negative electrodes of resistance R13 and electric capacity C7 one end and reference voltage
Source U3 anode；The electric capacity C7 other end passes through the resistance R14 connecting resistances R10 other end and resistance R11 one end；Resistance R11
One end be also connected with reference voltage source U3 reference pole；The resistance R11 other end and reference voltage source U3 anode connect secondary ground；
Optocoupler U2 output end colelctor electrode connects electric capacity C5 one end and power supply control chip U1 feedback end；The electric capacity C5 other end and light
Coupling output end emitter stage connects primary ground；
Transformer T1 primary Np second ends, secondary Ns first ends and assists winding Naux first ends are Same Name of Ends.
2. the secondary inverse-excitation type switch power-supply as claimed in claim 1 based on SP6650, it is characterised in that
Current rectifying and wave filtering circuit includes diode D1~D4, electric capacity C1；Diode D1~D4 composition rectifier bridges, C1 are connected in parallel on rectifier bridge
Two output ends.
3. the secondary inverse-excitation type switch power-supply as claimed in claim 1 based on SP6650, it is characterised in that
Optocoupler U2 uses PC817；Reference voltage source U3 uses TL431.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720295226.8U CN206595898U (en) | 2017-03-24 | 2017-03-24 | Secondary inverse-excitation type switch power-supply based on SP6650 |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720295226.8U CN206595898U (en) | 2017-03-24 | 2017-03-24 | Secondary inverse-excitation type switch power-supply based on SP6650 |
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| CN206595898U true CN206595898U (en) | 2017-10-27 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109742956A (en) * | 2018-01-19 | 2019-05-10 | 福建捷联电子有限公司 | Flyback switching power supply with power limiting power supply protection function |
| CN110044492A (en) * | 2019-05-24 | 2019-07-23 | 哈工大机器人（山东）智能装备研究院 | Calculus of differences amplifying circuit and image processing system for image processing system |
| CN110061638A (en) * | 2018-01-19 | 2019-07-26 | 无锡华润矽科微电子有限公司 | AC-DC driving circuit and encapsulating structure |
| CN110265971A (en) * | 2019-07-25 | 2019-09-20 | 杭州必易微电子有限公司 | Control circuit and chip |
| CN112072903A (en) * | 2020-08-28 | 2020-12-11 | 珠海格力电器股份有限公司 | Load protection device and method of flyback transformer switching power supply and electrical equipment |
| CN113315393A (en) * | 2021-05-21 | 2021-08-27 | 安徽省东科半导体有限公司 | Self-adaptive wide-voltage output circuit of switching power supply |
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2017
- 2017-03-24 CN CN201720295226.8U patent/CN206595898U/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109742956A (en) * | 2018-01-19 | 2019-05-10 | 福建捷联电子有限公司 | Flyback switching power supply with power limiting power supply protection function |
| CN110061638A (en) * | 2018-01-19 | 2019-07-26 | 无锡华润矽科微电子有限公司 | AC-DC driving circuit and encapsulating structure |
| CN110061638B (en) * | 2018-01-19 | 2020-12-18 | 无锡华润矽科微电子有限公司 | AC-DC driving circuit and packaging structure |
| CN109742956B (en) * | 2018-01-19 | 2021-04-20 | 福建捷联电子有限公司 | Flyback switching power supply with power limiting power supply protection function |
| CN110044492A (en) * | 2019-05-24 | 2019-07-23 | 哈工大机器人（山东）智能装备研究院 | Calculus of differences amplifying circuit and image processing system for image processing system |
| CN110265971A (en) * | 2019-07-25 | 2019-09-20 | 杭州必易微电子有限公司 | Control circuit and chip |
| CN112072903A (en) * | 2020-08-28 | 2020-12-11 | 珠海格力电器股份有限公司 | Load protection device and method of flyback transformer switching power supply and electrical equipment |
| CN113315393A (en) * | 2021-05-21 | 2021-08-27 | 安徽省东科半导体有限公司 | Self-adaptive wide-voltage output circuit of switching power supply |
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