CN110445405A - A kind of Switching Power Supply - Google Patents
A kind of Switching Power Supply Download PDFInfo
- Publication number
- CN110445405A CN110445405A CN201910865144.6A CN201910865144A CN110445405A CN 110445405 A CN110445405 A CN 110445405A CN 201910865144 A CN201910865144 A CN 201910865144A CN 110445405 A CN110445405 A CN 110445405A
- Authority
- CN
- China
- Prior art keywords
- capacitor
- circuit
- power supply
- rectification circuit
- switching power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000003990 capacitor Substances 0.000 claims abstract description 99
- 238000012937 correction Methods 0.000 claims abstract description 27
- 238000004804 winding Methods 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 10
- 230000005611 electricity Effects 0.000 description 8
- 238000001914 filtration Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- 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
-
- 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
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
- H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
- H02M7/12—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- 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)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Rectifiers (AREA)
Abstract
The invention discloses a kind of Switching Power Supplies comprising: capacitor filter, input terminal are connected to AC power source；Rectification circuit, input terminal are connected to the output end of the capacitor filter；Circuit of power factor correction, input terminal is connected to the output end of the rectification circuit, and the output end of the circuit of power factor correction is connected to load.Compared with prior art, Switching Power Supply of the invention increases capacitor filter between input AC source and rectification circuit, it can effectively reduce electromagnetic interference, and because capacitor filter is set between input AC source and rectification circuit, capacitor in the capacitor filter is only used as a kind of linear load, in the case where exporting full load state, the distortion of input current can be reduced, and then reduce harmonic wave.
Description
Technical field
The present invention relates to power technique fields, relate more specifically to a kind of Switching Power Supply.
Background technique
With the development of electronic technology and information technology, such as Switching Power Supply have small in size, light-weight, small power consumption and
The electronic product of the features such as high-efficient is widely used.However in Switching Power Supply application, power supply itself can generate great electricity
Magnetic disturbance, this electromagnetic interference can also be transferred to power grid, bring harm to power grid.Therefore, in order to reduce electromagnetic interference, Switching Power Supply
The capacitor filter that capacitor would generally be added between rectifier bridge and circuit of power factor correction, reduces electromagnetic interference, this
Although method realizes the function of inhibiting electromagnetic interference；But when Switching Power Supply is started to work, input voltage can be to capacitor filtering electricity
Filter capacitor in road charges, the filter capacitor energy storage, defeated because filter capacitor contains energy when input voltage zero passage
Enter voltage and be less than electric filtering capacity voltage, filter capacitor can release energy, and input current is zero at this time, it will so that input current lacks
A part is lost, generates harmonic wave, and filter capacitor capacity is bigger, load is smaller, and filter capacitor discharge time is longer, input current
Longer for the zero-time, harmonic wave is also bigger.
In consideration of it, the electromagnetic interference of power supply can be reduced it is necessary to provide one kind and reduced under full load output humorous
The Switching Power Supply of wave is to solve drawbacks described above.
Summary of the invention
Technical problem to be solved by the invention is to provide one kind can reduce the electromagnetic interference of power supply and in full load
The Switching Power Supply of output decline low harmony wave.
In order to solve the above technical problems, the present invention provides a kind of Switching Power Supply comprising:
Capacitor filter, input terminal are connected to AC power source；
Rectification circuit, input terminal are connected to the output end of the capacitor filter；
Circuit of power factor correction, input terminal are connected to the output end of the rectification circuit, and the PFC
The output end of circuit is connected to load.
Its further technical solution are as follows: the capacitor filter includes the first inductance, first capacitor and the second capacitor,
Wherein, the both ends of first inductance are connect with one end of the first capacitor and the second capacitor respectively, the first capacitor it is another
One end connects the other end of the second capacitor, and input terminal of the both ends of the first capacitor as the capacitor filter, even
It is connected to AC power source, output end of the both ends of second capacitor as the capacitor filter is connected to the rectification circuit.
Its further technical solution are as follows: the circuit of power factor correction includes power factor correction chip, the second electricity
Sense, first diode, the first transistor and electrolytic capacitor, wherein one end of second inductance connects the rectification circuit
Just, the other end connects the drain electrode of the anode and the first transistor of first diode for output, and the cathode of the first diode connects
The anode of the electrolytic capacitor is connect, the cathode of the electrolytic capacitor and the source electrode of the first transistor are connected to the defeated of the rectification circuit
It bears out, and output end of the both ends of the electrolytic capacitor as the circuit of power factor correction, connection load, the first crystal
The grid of pipe is connected to the output pin of PFC chip.
Its further technical solution are as follows: the circuit of power factor correction includes power factor correction chip, third electricity
Appearance, first resistor, the second diode, second transistor and the first transformer, wherein the first primary winding it is same
Name end is connect with one end of third capacitor and first resistor, and is connected to the output of the rectification circuit just, secondary windings company
Load is connect, and the different name end of the first primary winding connects the drain electrode of the anode and second transistor of the second diode,
The cathode connection third capacitor of second diode and the other end of first resistor, the source electrode of the second transistor are connected to institute
The output for stating rectification circuit is negative, and grid is connected to the output pin of PFC chip.
Its further technical solution are as follows: the Switching Power Supply further includes having one the 4th capacitor, with the power factor school
Positive circuit is in parallel, is connected to the output end of the rectification circuit.
Its further technical solution are as follows: the rectification circuit is bridge rectifier.
Compared with prior art, Switching Power Supply of the invention increases capacitor filter between input AC source and rectification circuit
Wave circuit can effectively reduce electromagnetic interference, and because capacitor filter is set between input AC source and rectification circuit, the electricity
Capacitor in capacitor filter circuit is only used as a kind of linear load, in the case where exporting full load state, can reduce the distortion of input current,
And then reduce harmonic wave.
Detailed description of the invention
Fig. 1 is the circuit block diagram schematic diagram of Switching Power Supply of the present invention.
Fig. 2 is the physical circuit schematic diagram of Switching Power Supply first embodiment of the present invention.
Fig. 3 is the physical circuit schematic diagram of Switching Power Supply second embodiment of the present invention.
Fig. 4 is the physical circuit schematic diagram of Switching Power Supply 3rd embodiment of the present invention.
Specific embodiment
To make those skilled in the art that the object, technical solutions and advantages of the present invention be more clearly understood, with
Under the present invention is further elaborated in conjunction with the accompanying drawings and embodiments.
Referring to FIG. 1 and FIG. 2, Fig. 1 is the circuit block diagram schematic diagram of Switching Power Supply 10 of the present invention, and Fig. 2 is Switching Power Supply 10 the
The physical circuit schematic diagram of one embodiment.In the embodiment shown in the figures, the Switching Power Supply 10 includes sequentially connected
Capacitor filter 101, rectification circuit 102 and circuit of power factor correction 103, specifically, the capacitor filter 101
Input terminal be connected to AC power source, the input terminal of the rectification circuit 102 is connected to the output of the capacitor filter 101
End, it is preferable that in the present embodiment, the rectification circuit 102 is bridge rectifier, i.e., in the present embodiment, the rectification circuit
102 are realized using rectifier bridge；103 input terminal of circuit of power factor correction is connected to the output end of the rectification circuit 102,
And the output end of the circuit of power factor correction 103 is connected to load.Based on above-mentioned design, Switching Power Supply 10 of the invention is being handed over
Capacitor filter 101 is increased between stream input source and bridge rectifier 102, can effectively reduce electromagnetic interference, and because of electricity
Capacitor filter circuit 101 is set between input AC source and bridge rectifier 102, the capacitor in the capacitor filter 101
It is only used as a kind of linear load, in the case where exporting full load state, the distortion of input current can be reduced, and then reduce harmonic wave.
In certain embodiments, the capacitor filter 101 includes the first inductance L1, first capacitor C1 and the second electricity
Hold C2, wherein the both ends of the first inductance L1 are connect with one end of the first capacitor C1 and the second capacitor C2 respectively, this
The other end of one capacitor C1 connects the other end of the second capacitor C2, and the both ends of the first capacitor C1 are as the capacitor filtering
The input terminal of circuit 101 is connected to AC power source, and the both ends of the second capacitor C2 are as the defeated of the capacitor filter 101
Outlet is connected to the rectification circuit 102.
In the present embodiment, the circuit of power factor correction 103 includes power factor correction chip (not shown), the
Two inductance L2, first diode D1, the first transistor Q1 and electrolytic capacitor E1, wherein one end of the second inductance L2 connects
The positive V+ of output of the rectification circuit 102, the other end connect the drain electrode of the anode and the first transistor Q1 of first diode D1,
The cathode of the first diode D1 connects the anode of the electrolytic capacitor E1, the cathode and the first transistor of electrolytic capacitor E1
The source electrode of Q1 is connected to the negative V- of output of the rectification circuit 102, and the both ends of electrolytic capacitor E1 are as the power factor
The output end of correcting circuit 103, connection load, the grid of the first transistor Q1 are connected to the defeated of PFC chip
Pin out.Preferably, in the present embodiment, the first transistor Q1 is mos pipe, and the PFC chip interior is integrated
There is PWM generator, the grid of the first transistor Q1 is connect with PWM generator, for according to the pulse from PWM generator
Signal adjusts the switch state of the first transistor Q1 and its time of switch, to control the circuit of power factor correction 103
Work.
It is the physical circuit schematic diagram of 10 second embodiment of Switching Power Supply of the present invention referring to Fig. 3, Fig. 3.The present embodiment and
One embodiment is the difference is that the Switching Power Supply 10 further includes having one the 4th capacitor C4, with the PFC
Circuit 103 is in parallel, is connected to the output end of the rectification circuit 102.Specifically, described in one end connection of the 4th capacitor C4
One end of second inductance L2, the 4th capacitor C4 in the positive V+ of output and the circuit of power factor correction 103 of rectification circuit 102
The other end connect the first transistor Q1 in the negative V- of output and the circuit of power factor correction 103 of the rectification circuit 102
Source electrode and electrolytic capacitor E1 cathode.Preferably, in the present embodiment, the 4th capacitor C4 is low capacity capacitor, capacitor
Capacitance of the capacity much smaller than capacitor in capacitor filter 101.Based on the design, in rectification circuit 102 and power factor
The 4th capacitor C4 is increased between correcting circuit 103, the electric current for carrying out self-rectifying circuit 102 can be filtered, and because of the 4th
Capacitor C4 capacity is small, and compared with the scheme referred in background technique, influence very little to input current will not be generated very big
Harmonic wave.
It is the physical circuit schematic diagram of 10 3rd embodiment of Switching Power Supply of the present invention referring to Fig. 4, Fig. 4.The present embodiment and
Two embodiments are the difference is that the particular circuit configurations of the circuit of power factor correction 103 are different, in the present embodiment,
The circuit of power factor correction 103 include power factor correction chip (not shown), third capacitor C3, first resistor R1,
Second diode D2, second transistor Q2 and the first transformer T1, wherein the Same Name of Ends of the first transformer T1 armature winding
Connect with one end of third capacitor C3 and first resistor R1, and be connected to the positive V+ of output of the rectification circuit 102, it is secondary around
Group connection load, and the different name end of the first transformer T1 armature winding connects the anode and second transistor of the second diode D2
The drain electrode of Q2, the other end of the cathode connection third capacitor C3 and first resistor R1 of second diode D2, the second transistor
The source electrode of Q2 is connected to the negative V- of output of the rectification circuit 102, and grid is connected to the output of PFC chip
Pin.Preferably, in the present embodiment, the second transistor Q2 is also mos pipe, and the PFC chip interior is same
It is integrated with PWM generator, the grid of the second transistor Q2 is connect with PWM generator, for according to from PWM generator
Pulse signal adjusts the switch state of second transistor Q2 and its time of switch, to control the circuit of power factor correction
103 work.
In conclusion Switching Power Supply of the invention increases capacitor filtering electricity between input AC source and rectification circuit
Road can effectively reduce electromagnetic interference, and because capacitor filter is set between input AC source and rectification circuit, capacitor filter
Capacitor in wave circuit is only used as a kind of linear load, in the case where exporting full load state, can reduce the distortion of input current, in turn
Reduce harmonic wave.
The above description is only a preferred embodiment of the present invention, rather than does limitation in any form to the present invention.This field
Technical staff can impose various equivalent changes and improvement, all institutes within the scope of the claims on the basis of the above embodiments
The equivalent variations or modification done, should all fall under the scope of the present invention.
Claims (6)
1. a kind of Switching Power Supply, which is characterized in that the Switching Power Supply includes:
Capacitor filter, input terminal are connected to AC power source；
Rectification circuit, input terminal are connected to the output end of the capacitor filter；
Circuit of power factor correction, input terminal are connected to the output end of the rectification circuit, and the circuit of power factor correction
Output end be connected to load.
2. Switching Power Supply as described in claim 1, it is characterised in that: the capacitor filter includes the first inductance,
One capacitor and the second capacitor, wherein the both ends of first inductance connect with one end of the first capacitor and the second capacitor respectively
It connects, the other end of the first capacitor connects the other end of the second capacitor, and the both ends of the first capacitor are filtered as the capacitor
The input terminal of wave circuit, is connected to AC power source, and output end of the both ends of second capacitor as the capacitor filter connects
It is connected to the rectification circuit.
3. Switching Power Supply as described in claim 1, it is characterised in that: the circuit of power factor correction includes power factor
Correcting chip, the second inductance, first diode, the first transistor and electrolytic capacitor, wherein one end of second inductance connects
The output of the rectification circuit just, the other end connect first diode anode and the first transistor drain electrode, described first
The cathode of diode connects the anode of the electrolytic capacitor, and the cathode of the electrolytic capacitor and the source electrode of the first transistor are connected to institute
The output for stating rectification circuit is negative, and output end of the both ends of the electrolytic capacitor as the circuit of power factor correction, and connection is negative
It carries, the grid of the first transistor is connected to the output pin of PFC chip.
4. Switching Power Supply as described in claim 1, it is characterised in that: the circuit of power factor correction includes power factor
Correcting chip, third capacitor, first resistor, the second diode, second transistor and the first transformer, wherein described first becomes
The Same Name of Ends of depressor armature winding is connect with one end of third capacitor and first resistor, and is connected to the output of the rectification circuit
Just, secondary windings connection load, and the different name end of the first primary winding connects the anode and the of the second diode
The drain electrode of two-transistor, the cathode connection third capacitor of second diode and the other end of first resistor, the second transistor
Source electrode be connected to the rectification circuit output it is negative, grid is connected to the output pin of PFC chip.
5. Switching Power Supply as described in claim 1, it is characterised in that: the Switching Power Supply further includes having one the 4th capacitor,
It is in parallel with the circuit of power factor correction, it is connected to the output end of the rectification circuit.
6. Switching Power Supply as described in claim 1, it is characterised in that: the rectification circuit is bridge rectifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910865144.6A CN110445405A (en) | 2019-09-12 | 2019-09-12 | A kind of Switching Power Supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910865144.6A CN110445405A (en) | 2019-09-12 | 2019-09-12 | A kind of Switching Power Supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110445405A true CN110445405A (en) | 2019-11-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910865144.6A Pending CN110445405A (en) | 2019-09-12 | 2019-09-12 | A kind of Switching Power Supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115027354A (en) * | 2022-04-27 | 2022-09-09 | 常州星宇车灯股份有限公司 | Vehicle front LOGO light switch control system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110148318A1 (en) * | 2008-11-28 | 2011-06-23 | Lightech Electronic Industries Ltd. | Phase controlled dimming led driver system and method thereof |
| CN102752940A (en) * | 2012-07-19 | 2012-10-24 | 矽力杰半导体技术(杭州)有限公司 | High-efficiency LED (light-emitting diode) drive circuit and drive method thereof |
| CN203072197U (en) * | 2011-12-01 | 2013-07-17 | Rab照明设备公司 | LED driver protection circuit |
| CN203251469U (en) * | 2013-04-26 | 2013-10-23 | 深圳市瑞之辰科技有限公司 | Light emitting diode driving circuit |
| CN211183823U (en) * | 2019-09-12 | 2020-08-04 | 深圳瓦特智汇科技有限公司 | Switch power supply |
-
2019
- 2019-09-12 CN CN201910865144.6A patent/CN110445405A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110148318A1 (en) * | 2008-11-28 | 2011-06-23 | Lightech Electronic Industries Ltd. | Phase controlled dimming led driver system and method thereof |
| CN203072197U (en) * | 2011-12-01 | 2013-07-17 | Rab照明设备公司 | LED driver protection circuit |
| CN102752940A (en) * | 2012-07-19 | 2012-10-24 | 矽力杰半导体技术(杭州)有限公司 | High-efficiency LED (light-emitting diode) drive circuit and drive method thereof |
| CN203251469U (en) * | 2013-04-26 | 2013-10-23 | 深圳市瑞之辰科技有限公司 | Light emitting diode driving circuit |
| CN211183823U (en) * | 2019-09-12 | 2020-08-04 | 深圳瓦特智汇科技有限公司 | Switch power supply |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115027354A (en) * | 2022-04-27 | 2022-09-09 | 常州星宇车灯股份有限公司 | Vehicle front LOGO light switch control system |
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