CN107086798A - Switching power circuit - Google Patents
Switching power circuit Download PDFInfo
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- CN107086798A CN107086798A CN201710203822.3A CN201710203822A CN107086798A CN 107086798 A CN107086798 A CN 107086798A CN 201710203822 A CN201710203822 A CN 201710203822A CN 107086798 A CN107086798 A CN 107086798A
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- 238000002955 isolation Methods 0.000 claims abstract description 19
- 238000012937 correction Methods 0.000 claims abstract description 18
- 230000001629 suppression Effects 0.000 claims description 10
- 230000003750 conditioning effect Effects 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 5
- 101000844751 Metallosphaera cuprina (strain Ar-4) DNA-binding protein 7 Proteins 0.000 description 17
- 238000010586 diagram Methods 0.000 description 11
- 230000001681 protective effect Effects 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 102100024452 DNA-directed RNA polymerase III subunit RPC1 Human genes 0.000 description 1
- 101000689002 Homo sapiens DNA-directed RNA polymerase III subunit RPC1 Proteins 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- 238000012544 monitoring 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
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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
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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
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4225—Arrangements for improving power factor of AC input using a non-isolated boost converter
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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
- H02M1/123—Suppression of common mode voltage or current
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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
Abstract
The invention discloses a kind of switching power circuit, including main power network, electromagnetic interface filter, rectifier bridge, the main power network output end connection electromagnetic interface filter input, the output end of the electromagnetic interface filter connects the input of rectifier bridge, it is characterised in that：Also include power factor correction module, isolation DC/DC modules, adjustable DC/DC modules, MCU, the first acquisition module, the second acquisition module, control circuit, described rectification bridge output end connection power factor correction module, the power factor correction module is connected after isolating DC/DC modules, adjustable DC/DC modules with load successively, the output voltage data of the first acquisition module collection isolation DC/DC modules, second acquisition module gathers the voltage of adjustable DC/DC modules output, current data；Output end, the output end of the second acquisition module of first acquisition module are all connected with MCU input, and the output end of the MCU is through controlling circuit to control to isolate the output voltage of DC/DC modules and adjustable DC/DC modules respectively.
Description
Technical field
This law invention belongs to field of circuit control, more particularly to a kind of switching power circuit.
Background technology
At present, with the development of Power Electronic Technique, huge attention is obtained as the power circuit of electronic equipment heart,
Especially there is the Switching Power Supply of efficient energy-efficient performance.Switching Power Supply is generally by input rectifying wave filter, power switch pipe, defeated
Go out rectifier filter and the part of controller 4 composition, its effect is that input ac voltage is converted into VD.Switch electricity
Source is the requirement for meeting modern electronic equipment development, is mainly opened to intellectuality, high frequency, miniaturization, especially small-power
The miniaturization in powered-down source.
Switching Power Supply has single DC rectifier circuit, the rectification circuit of each device in each user equipment
Good and bad, the influence for big circuit is also to be not quite similar, especially for the suppression of harmonic wave.Why each device needs
The reason for wanting single rectification circuit is that the requirement in device inside circuit for direct current differs, and results in the need for individually designed each
From rectification circuit, which increases the cost of Switching Power Supply.Given this kind of one kind of inexpensive wide range output is designed
Many feedback switch power circuits are particularly important.
The content of the invention
It is contemplated that at least solving one of technical problem present in prior art.Opened therefore, the present invention provides one kind
Powered-down source circuit, it is therefore an objective to improve the direct current output scope of Switching Power Supply and suppress function with safety protection function harmonic.
To achieve these goals, the technical scheme taken of the present invention is：
A kind of switching power circuit, including main power network, electromagnetic interface filter, rectifier bridge, the main power network output end connection EMI
Filter input end, the output end of the electromagnetic interface filter connects the input of rectifier bridge, it is characterised in that：Also include isolation DC/
DC modules, adjustable DC/DC modules, MCU, the first acquisition module, the second acquisition module, control circuit, first acquisition module
The output voltage data of collection isolation DC/DC modules, the voltage of the adjustable DC/DC modules output of the second acquisition module collection,
Current data；Output end, the output end of the second acquisition module of first acquisition module are all connected with MCU input, described
MCU output end is through controlling circuit to control to isolate the output voltage of DC/DC modules and adjustable DC/DC modules respectively.
Described MCU connects isolation DC/DC modules and adjustable DC/ respectively by the first enable circuit, the second enable circuit
DC modules.
Preferably, the control circuit is realized using NCP1397B.
The switching power circuit also includes signal conditioning circuit, and the signal conditioning circuit input connects main power network, its
Output end connects MCU input.
The input of the MCU sets clamping protective circuit, and it is used for the magnitude of voltage for limiting MCU input ports.
The EMI filter circuit include electric capacity C140, C146, C142, common mode inductance L15, electric capacity C150, electric capacity C151,
Electric capacity C139, main power network output signal connects to form common-mode interference suppression circuit, differential mode through electric capacity C140 and electric capacity C146 successively
Suppress the common mode disturbances suppression that electric capacity C142, common mode inductance L15, differential mode suppress electric capacity C142, electric capacity C139 and electric capacity C151 compositions
Exported after circuit processed.
The power factor correction module includes switching tube Q17, fly-wheel diode VD2, control chip, the control chip
Using NPC1654, two output end shunt capacitance C144, electric capacity C144 one end of rectifier bridge connect Q17 source electrode, electric capacity C144
The other end by inductance connection Q17 drain electrode, Q17 grid connects the DRV pin of control chip, Q17 source ground, Q17
Drain electrode be connected with diode VD2 anode, diode VD2 negative electrode connects electric capacity C145 one end and diode VD1 respectively
Negative electrode, electric capacity C145 other end ground connection, diode VD1 anode is connected between electric capacity C144 and inductance L14；In electric capacity
Distinguish shunt capacitance C147, electric capacity C143, electric capacity C149, electric capacity C141 and electric capacity C148 successively in C145 two ends；Control chip
VCC ends input+12V power supplys, the BO pin and CS pin of control chip connect two output ends of rectifier bridge respectively, control chip
FB pin are connected to diode VD2 anode through resistance R140 and resistance R137 successively.
It is an advantage of the invention that the notice that power factor correction circuit suppresses harmonic wave improves efficiency, in isolation
Working frequency is in resonant frequency and improves efficiency in DC/DC modules.In the adjustable DC/DC electricity of outlet side
The requirement of wide range output has been reached in road.Specific voltage electricity can be obtained according to the different demand of user
Flow valuve.The topological structure complexity of use is low, easily realizes, cost is controlled effectively.
Brief description of the drawings
This specification includes the following drawings, and shown content is respectively：
Fig. 1 is the structural principle block diagram of the present invention；
Fig. 2 is the schematic diagram of electromagnetic interface filter；
Fig. 3 is the circuit theory diagrams of power factor correction module；
Fig. 4 is the first enable circuit theory diagrams；
Fig. 5 is the second enable circuit figure；
Fig. 6 controls circuit theory diagrams；
Fig. 7 signal conditioning circuit diagrams；
Fig. 8 is the first acquisition module voltage collection circuit figure；
Fig. 9 is the second collecting unit voltage collection circuit figure；
Figure 10 is the second collecting unit current collection circuit figure；
Figure 11 is MCU chip figure；
Marked in figure：1st, main power network；2nd, electromagnetic interface filter；3rd, rectifier bridge；4th, power factor correction module；5th, DC/ is isolated
DC modules；6th, adjustable DC/DC modules；7、MCU；8th, the first acquisition module；9th, the second acquisition module；10th, circuit is controlled；11st,
One enables circuit；12nd, second circuit is enabled；13rd, signal conditioning circuit.
Embodiment
Below against accompanying drawing, by the description to embodiment, the embodiment to the present invention makees further details of
Explanation, it is therefore an objective to help those skilled in the art to have more complete, accurate and deep reason to design of the invention, technical scheme
Solution, and contribute to it to implement.
As shown in figure 1, a kind of Switching Power Supply, including main power network 1, electromagnetic interface filter 2, rectifier bridge 3, isolation DC/DC modules 5,
Adjustable DC/DC modules 6, MCU7, the first acquisition module 8, the second acquisition module 9, control circuit 10, the main output end of power network 1 connection
The input of electromagnetic interface filter 2, the output end of electromagnetic interface filter 2 connects the input of rectifier bridge 3, the output end connection work(of rectifier bridge 3
Rate factor correction module, power factor correction module output end connection isolation DC/DC modules 5, the output end of isolation DC/DC modules 5
Through adjustable DC/DC output connection loads.The output voltage data of first acquisition module 8 collection isolation DC/DC modules 5, second adopts
Collection module 9 gathers voltage, the current data that adjustable DC/DC modules 6 are exported；The output end of first acquisition module 8, the second collection mould
The output end of block 9 is all connected with MCU7 input, and MCU7 output end is through controlling circuit 10 to control isolation DC/DC modules 5 respectively
With the output voltage of adjustable DC/DC modules 6.MCU7 modules through first enable circuit 11, second enable circuit 12 connect respectively every
From DC/DC modules 5 and adjustable DC/DC modules 6.MCU7 is realized using NCP1397B.
The output of main power network 1 through electromagnetic interface filter 2 filter after be output to after rectifier bridge 3, rectified bridge 3 export to power because
Plain correction module is used to power factor (PF) bringing up to more than 95%, and power factor (PF) adjusts the output end of correction module to sequentially pass through isolation
Load is output to after DC/DC modules 5 and adjustable DC/DC modules 6, while MCU7 is according to the first acquisition module 8, the second acquisition module
9 connect the data message of adjustable DC/DC and isolation DC/DC modules 5 respectively, respectively by enabling circuit and control after analyzing and processing
Circuit 10 processed adjusts the work of DC/DC modules.Control signal is sent after the data analysis that MCU7 passes through collection to isolation DC/DC
The control of module 5 and adjustable DC/DC modules 6 is with the corresponding loading demand of the power for reaching output end.Signal conditioning circuit 13 is used for
The voltage data of main power network 1 is gathered, judges whether main power network 1 normally exports, can be controlled when main power network 1 is normally exported adjustable
The working condition of DC/DC chips is in without voltage transformation or forbids work, to reduce power consumption, by isolating DC/DC outputs
Load can be met.
For the safety of MCU7 output end voltages, clamping protective circuit is set to be used to limit MCU7 in MCU7 inputs here
The magnitude of voltage of input port.The diode that clamping protective circuit is sequentially connected in series by two anode cathodes is constituted, diode D1 sun
Pole connects -5V power supplys, and diode D1 negative electrode connects diode D2 anode, and diode D2 negative electrode connects+5V power supplys, in diode
MCU7 output end is connected between D1 negative electrode and diode D2 anode, to protect I/O port excessive and damage not by voltage
It is bad.
If Fig. 2 is the schematic diagram of electromagnetic interface filter 2, the input of electromagnetic interface filter 2 is connected with the output end of main power network 1, EMI
The output end of wave filter 2 is connected with the output end of rectifier bridge 3.Electromagnetic interface filter 2 is used to filter out High-frequency Interference, EMI filter circuit bag
Include electric capacity C140, C146, C142, common mode inductance L15, electric capacity C150, electric capacity C151, electric capacity C139, the main output signal of power network 1 according to
It is secondary connected through electric capacity C140 and electric capacity C146 to be formed common-mode interference suppression circuit, differential mode suppress electric capacity C142, common mode inductance L15,
Differential mode is exported after suppressing the common-mode interference suppression circuit of electric capacity C142, electric capacity C139 and electric capacity C151 compositions.Simultaneously in electric capacity
C139 and electric capacity C151 indirectly.Output end is drawn in C139 one end, the C139 other end connects C151 one end, C151's
The other end draws lead-out terminal, and two lead-out terminals are connected on two inputs of rectifier bridge 3.Rectifier bridge 3 is Xiao Te
Based diode constitutes bridge rectifier.The rectified half-waves of output are exported to power factor correction module, to improve suppression
Harmonic wave.
The circuit diagram of power factor correction module is illustrated in figure 3, power factor correction module includes switching tube Q17, continued
Diode VD2, control chip are flowed, the control chip uses NPC1654, two output end shunt capacitance C144 of rectifier bridge 3,
Electric capacity C144 one end connects Q17 source electrode, and the electric capacity C144 other end passes through inductance connection Q17 drain electrode, Q17 grid connection
The DRV pin of control chip, Q17 source ground, Q17 drain electrode is connected with diode VD2 anode, diode VD2 negative electrode
Electric capacity C145 one end and diode VD1 negative electrode, electric capacity C145 other end ground connection, diode VD1 anode are connected respectively
It is connected between electric capacity C144 and inductance L14, VD1 protection inductance has consumption loop in instantaneous backward voltage, without going damage
Hardware；Distinguish shunt capacitance C147, electric capacity C143, electric capacity C149, electric capacity C141 and electric capacity successively at electric capacity C145 two ends
C148, the output end of power factor correction module is drawn by electric capacity C148 two ends；The VCC ends input+12V power supplys of control chip,
The BO pin and CS pin of control chip connect two output ends of rectifier bridge 3 respectively, and the FB pin of control chip are successively through resistance R140
Diode VD2 anode is connected to resistance R137.The GND pin ground connection of control chip, the VM pin of control chip are connect by resistance
Ground.The VCON pin of control chip are grounded through resistance R144 and electric capacity C155 successively, and electric capacity C158 is attempted by resistance R144 and electric capacity
The series circuit two ends of C155 compositions.
The schematic diagram of the first enable circuit 11 is illustrated in figure 4, the circuit is by optocoupler HCPL-817-500AE and transistor Q16
Composition, transistor source ground connection, grid is by resistance R115 connection power supplys+15V, power supply+15V through resistance R107 connection optocouplers
One input, another input connection transistor Q16 of optocoupler drain electrode, grid is after resistance R115 through electric capacity C114
Ground connection, optocoupler output connection isolation DC/DC modules 5.As shown in figure 5, be a kind of the second circuit implementations for enabling module,
MCU7 output ends are connected to Q5 drain electrode, and Q5 source ground and source electrode are drained by electric capacity C47 connections, and+15V power supplys are through resistance
R35 connects Q5 drain electrode, and grid connects adjustable DC/DC modules 6, and grid is through resistance R36 connection+15V power supplys.
As shown in fig. 6, being control circuit 10, it is used to control isolation DC/DC modules 5 and adjustable DC/DC modules 6, and it is wrapped
Include chip HEF40106B and amplifier, MCU7 output signals sequentially pass through after chip HEF40106B, resistance R42, resistance R41 with fortune
The in-phase input end connection put, in-phase input end is grounded by electric capacity C50.Inverting input is connected with output end, while anti-phase
Input is connected between resistance R41 and R42 through electric capacity C49.The output end of amplifier through resistance connect adjustable DC/DC modules 6 or every
From DC/DC modules 5.The schematic diagram of Fig. 7 signal conditioning circuits 13, it is used to detecting that the alternating current of main power network 1 to be inputted after being acquired
Into MCU7, two input connects the N lines and L lines of main power network 1 respectively, respectively through being connected to amplifier OP2A's after resistance
In-phase input end and inverting input, inverting input connect output end through resistance R156, resistance R156 two ends shunt capacitance C156,
Inverting input of the amplifier OP2A output ends through resistance R161 connection amplifiers OP3A, its in-phase input end ground connection, amplifier OP3A's
Output end connects amplifier inverting input through electric capacity C160, optocoupler HCNR201 output end is connected through resistance, and its output end is through amplifier
MCU7 AD inputs are input to after OP4A.
If Fig. 8 is to connect electricity after the first acquisition module 8 is used for the circuit diagram of collection voltages, the signal classics group R93 of collection
Hinder R95 and resistance R98 one end, R98 other ends ground connection, resistance R95 other end connection MCU7.Resistance R98 shunt capacitances
C109.While in order to prevent the excessive setting clamping protective circuit of voltage.Fig. 9 and Figure 10 are the electric current and voltage of the second collecting unit
A kind of implementation of Acquisition Circuit, is respectively intended to gather the voltage and current data of adjustable DC/DC modules 6.
If Figure 11 is in the present invention, MCU7 chip concept figure, chip is NCP1397B chips, and it is used to control DC/DC
Module, its CSS pin is grounded through resistance R8, electric capacity C107, and RT pin are grounded after resistance R88 connection electric capacity C107, and RT pin are through resistance
R91 is grounded, and Ctimer pin are grounded through resistance R92, R92 two ends shunt capacitance C106.The chip possesses overcurrent protection function, by
R79, R83, R87, C108, D21, D22, R99 constitute current source, by detecting resonant capacitor voltage, are turned electric current using R102
Voltage output is turned to being transferred to Fault mouthfuls after filter capacitor C112.When Fault mouthfuls of voltages reach 1.04V threshold value when
Waiting CSS inner grounds switch opening has C107 to start electric discharge, and when C107 voltages decline, working frequency rises, and Rt discharging currents increase
Greatly, it is that circuit output voltage rises, electric current declines, and reaches the purpose of protection switch pipe.Simultaneously CTIMER charges to C106,
When C106 is full of also in Fault high-voltage cases, i.e. overcurrent, chip enters overcurrent protection pattern, at this moment
C106, and not in charging, C107 is discharged by R92, and opening chip when reaching 1V monitors Fault port voltages again,
If also in high voltage, continuing C107 discharge and recharge, periodically removing monitoring state, a kind of similar scan period.
The present invention is exemplarily described above in association with accompanying drawing.Obviously, the present invention is implemented not by above-mentioned side
The limitation of formula.As long as employ the improvement of the various unsubstantialities of inventive concept and technical scheme of the present invention progress；Or not
It is improved, the above-mentioned design of the present invention and technical scheme are directly applied into other occasions, in protection scope of the present invention
Within.
Claims (7)
1. switching power circuit, including main power network, electromagnetic interface filter, rectifier bridge, the main power network output end connection electromagnetic interface filter
Input, the output end of the electromagnetic interface filter connects the input of rectifier bridge, it is characterised in that：Also include Active PFC
Module, isolation DC/DC modules, adjustable DC/DC modules, MCU, the first acquisition module, the second acquisition module, control circuit, it is described
Rectification bridge output end connection power factor correction module, the power factor correction module successively through isolate DC/DC modules, can
It is connected after tune DC/DC modules with load, the output voltage data of the first acquisition module collection isolation DC/DC modules are described
Second acquisition module gathers the voltage of adjustable DC/DC modules output, current data；The output end of first acquisition module,
The output end of two acquisition modules is all connected with MCU input, and the output end of the MCU is through controlling circuit to control to isolate DC/ respectively
The output voltage of DC modules and adjustable DC/DC modules.
2. switching power circuit as claimed in claim 1, it is characterised in that：Described MCU enables circuit, second by first
Enable circuit and connect isolation DC/DC modules and adjustable DC/DC modules respectively.
3. switching power circuit as claimed in claim 1, it is characterised in that：The MCU is realized using NCP1397B.
4. switching power circuit as claimed in claim 1, it is characterised in that：Also include signal conditioning circuit, the signal is adjusted
Manage circuit input end and connect main power network, its output end connects MCU input.
5. switching power circuit as claimed in claim 1, it is characterised in that：The input of the MCU sets clamper to protect electricity
Road, it is used for the magnitude of voltage for limiting MCU input ports.
6. switching power circuit as claimed in claim 1, it is characterised in that：The EMI filter circuit include electric capacity C140,
C146, C142, common mode inductance L15, electric capacity C150, electric capacity C151, electric capacity C139, main power network output signal is successively through electric capacity C140
Connect to form common-mode interference suppression circuit, differential mode suppression electric capacity C142, common mode inductance L15, differential mode suppression electric capacity with electric capacity C146
Exported after the common-mode interference suppression circuit of C142, electric capacity C139 and electric capacity C151 compositions.
7. switching power circuit as claimed in claim 1, it is characterised in that：The power factor correction module includes switching tube
Q17, fly-wheel diode VD2, control chip, the control chip use NPC1654, two output end shunt capacitances of rectifier bridge
C144, electric capacity C144 one end connect Q17 source electrode, and the electric capacity C144 other end passes through inductance connection Q17 drain electrode, Q17 grid
Pole connects the DRV pin of control chip, and Q17 source ground, Q17 drain electrode is connected with diode VD2 anode, diode VD2
Negative electrode connect electric capacity C145 one end and diode VD1 negative electrode respectively, electric capacity C145 other end ground connection, diode VD1
Anode be connected between electric capacity C144 and inductance L14；Distinguish shunt capacitance C147, electric capacity successively at electric capacity C145 two ends
C143, electric capacity C149, electric capacity C141 and electric capacity C148；The VCC ends input+12V power supplys of control chip, the BO pin of control chip and
CS pin connect two output ends of rectifier bridge respectively, and the FB pin of control chip are connected to two through resistance R140 and resistance R137 successively
Pole pipe VD2 anode.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710203822.3A CN107086798B (en) | 2017-03-30 | 2017-03-30 | Switching power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710203822.3A CN107086798B (en) | 2017-03-30 | 2017-03-30 | Switching power supply circuit |
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| CN107086798A true CN107086798A (en) | 2017-08-22 |
| CN107086798B CN107086798B (en) | 2024-02-27 |
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|---|---|---|---|
| CN201710203822.3A Active CN107086798B (en) | 2017-03-30 | 2017-03-30 | Switching power supply circuit |
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Cited By (1)
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| CN107086798B (en) | 2024-02-27 |
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