CN106452050B - A kind of circuit of power factor correction, Switching Power Supply and display - Google Patents
A kind of circuit of power factor correction, Switching Power Supply and display Download PDFInfo
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- CN106452050B CN106452050B CN201611075177.3A CN201611075177A CN106452050B CN 106452050 B CN106452050 B CN 106452050B CN 201611075177 A CN201611075177 A CN 201611075177A CN 106452050 B CN106452050 B CN 106452050B
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
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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 present invention discloses a kind of circuit of power factor correction, comprising: converter, input terminal of the input terminal as the power factor correction circuit；Transformer, input terminal are connect with the output end of the converter, output end of the output end as the power factor correction circuit；Wherein, the converter conversion is input to the input voltage of the converter as setting voltage and exports to the transformer, and the transformer carries out transformation to the setting voltage to obtain output voltage.Invention additionally discloses the Switching Power Supplies and display of the above-mentioned power factor correction circuit of application.Circuit of power factor correction of the invention converts input voltage into setting voltage and transformer by converter and carries out transformation to setting voltage, realizes wide-voltage range input, the input voltage range than existing pfc circuit is wide, high conversion efficiency.
Description
Technical field
The present invention relates to technical field of electric power more particularly to a kind of circuit of power factor correction, Switching Power Supply and display.
Background technique
PFC used in television indicator (Power Factor Correction, PFC) circuit is big at present
Boost circuit or transformer are mostly used to carry out isolation boosting, still, in traditional Boost circuit, when output voltage is big
When 10 times of input voltage, circuit efficiency is very low and not can be carried out output and is isolated with input, and then input voltage range compares
It is small；When carrying out transformer boosting using common topology, it is difficult to realize wide scope input.
Summary of the invention
It is an object of the present invention to be directed to the above-mentioned deficiency of existing circuit of power factor correction, a kind of power factor is provided
Correcting circuit, Switching Power Supply and display realize the input of wide-voltage range.
In order to solve the above technical problems, the technical scheme adopted by the invention is that providing a kind of PFC electricity
Road, comprising: converter, input terminal of the input terminal as the circuit of power factor correction；Transformer, input terminal and the transformation
The output end of device connects, output end of the output end as the circuit of power factor correction；Wherein, the converter includes first
Switching tube and second switch, the first switch tube and the second switch are connected in series, and are opened by control described first
The working condition of pipe and second switch is closed to convert the input voltage for being input to the converter to set voltage, and will be described
Voltage output is set to the transformer, the transformer carries out transformation to the setting voltage to obtain output voltage；It is described
Converter further includes first resistor, second resistance, 3rd resistor, the 4th resistance and the 5th resistance, wherein the first switch tube
Grid connect with the first resistor, the second resistance；The grid of the second switch connects by the 3rd resistor
It connects with reference to ground, the source electrode of the second switch is by the 5th resistance connection with reference to ground；The converter further includes first
Capacitor, the second capacitor, inductance and third capacitor, wherein the first capacitor and the second capacitor are connected in series with each other, and are mutually gone here and there
One end of the first capacitor and second capacitor that join connection is connect with the drain electrode connection of the first switch tube, the other end
With reference to ground, the node between the first capacitor and second capacitor is connect with one end of the primary coil of the transformer,
One end of the inductance is connect as the input terminal of the converter, the other end with one end of the third capacitor, the third
The other end of capacitor is connect with the other end of the primary coil of the transformer, and the grid of the first switch tube passes through described the
Node connection between one resistance and the inductance and the third capacitor, the grid of the second switch pass through the third
Resistance is connect with reference；Relationship between the input voltage and the output voltage meets following formula: Vout=Vin*
Ns/ (1-D), Vin indicate that the input voltage of the converter, Vout indicate that the output voltage, Ns indicate the transformer
The turn ratio of primary coil and secondary coil, D indicate to control the drive of the working condition of the first switch tube and second switch
The duty ratio of dynamic signal.
Wherein, the working condition of the first switch tube and the second switch includes: the first switch tube and institute
It states second switch and is in off state, the first switch tube second switch in cut-off
State and the first switch tube are in off state and the second switch is in the conductive state.
In order to solve the above technical problems, there is provided a kind of Switching Power Supply, packets for another technical solution of the present invention
Include: rectifier, input terminal are electrically connected with exchange；Circuit of power factor correction, input terminal are connect with the output end of the rectifier,
Output end and load connect；The converter includes first switch tube and second switch, the first switch tube and described the
Two switching tubes are connected in series, and are converted described in being input to by controlling the working condition of the first switch tube and second switch
The input voltage of converter is setting voltage, and will set voltage output to the transformer, and the transformer is to the setting
Voltage carries out transformation to obtain output voltage and export to the load；
The converter further includes first resistor, second resistance, 3rd resistor, the 4th resistance and the 5th resistance, wherein institute
The grid for stating first switch tube is connect with the first resistor, the second resistance；The grid of the second switch passes through institute
3rd resistor, the 4th resistance connection are stated with reference to ground, the source electrode of the second switch is by the 5th resistance connection ginseng
Examine ground；
The converter further includes first capacitor, the second capacitor, inductance and third capacitor, wherein the first capacitor
It is connected in series with each other with the second capacitor, one end of the first capacitor and second capacitor that are connected in series with each other and described the
The drain electrode connection of one switching tube, other end connection reference ground, node and institute between the first capacitor and second capacitor
One end connection of the primary coil of transformer is stated, one end of the inductance is as the input terminal of the converter, the other end and institute
One end connection of third capacitor is stated, the other end of the third capacitor is connect with the other end of the primary coil of the transformer,
The grid of the first switch tube is connected by the node between the first resistor and the inductance and the third capacitor, institute
The grid for stating second switch is connect by the 3rd resistor with reference；
Relationship between the input voltage and the output voltage meets following formula: Vout=Vin*Ns/ (1-D),
Vin indicates the input voltage of the converter, and Vout indicates the output voltage, Ns indicate the primary coil of the transformer with
The turn ratio of secondary coil, D indicate to control accounting for for the driving signal of the working condition of the first switch tube and second switch
Empty ratio.
Wherein, the Switching Power Supply further includes control circuit, for controlling the first switch tube and the second switch
The working condition of pipe is so that the converter converts the input voltage for being input to the converter as the setting voltage.
Wherein, the working condition of the first switch tube and the second switch includes: the first switch tube and institute
It states second switch and is in off state, the first switch tube second switch in cut-off
State and the first switch tube are in off state and the second switch is in the conductive state.
In order to solve the above technical problems, the technical scheme adopted by the invention is that providing a kind of display, including mainboard
And the above-mentioned Switching Power Supply of power supply is provided to mainboard.
The beneficial effects of the present invention are as follows: pfc circuit converts input voltage into setting voltage and transformation by converter
Device carries out transformation to setting voltage, realizes wide-voltage range input, and the input voltage range than existing pfc circuit is wide, conversion
It is high-efficient, for example, existing pfc circuit is when output voltage is 380V, input voltage range 65-230V, and the application
The input voltage range of pfc circuit is 20-300V.
Further, boosting is realized by the first switch tube of series connection and second switch, relative to existing PFC
Circuit, in the input for realizing same range, first switch tube and the second switch voltage stress to be born are small, thus this Shen
Pfc circuit please further realizes wide-voltage range input.
Detailed description of the invention
Below in conjunction with drawings and the embodiments, the invention will be further described, in attached drawing:
Fig. 1 is the structural schematic diagram of circuit of power factor correction embodiment of the invention；
Fig. 2 is a kind of physical circuit figure of the pfc circuit of the above embodiment of the present invention；
Fig. 3 a-3d is equivalent circuit diagram of the pfc circuit of the above embodiment of the present invention in different moments；
Fig. 4 is the structural schematic diagram of Switching Power Supply embodiment of the invention；
Fig. 5 is a kind of physical circuit figure of the Switching Power Supply of the above embodiment of the present invention；
Fig. 6 is the structural schematic diagram of display embodiment of the invention.
Specific embodiment
To make those skilled in the art more fully understand technical solution of the present invention, with reference to the accompanying drawing and it is embodied
Mode is described in further detail technical solution of the present invention.
As shown in Figure 1, being the structural schematic diagram of circuit of power factor correction embodiment of the invention, the PFC
Circuit (hereinafter referred to as pfc circuit) 100 includes converter 110 and transformer 120, the input terminal and converter 110 of transformer 120
Output end connection, input terminal of the input terminal of converter 110 as the pfc circuit 100, the output end conduct of transformer 120
The output end of the pfc circuit 100, in which:
It is setting voltage Vp that transformer 110, which is converted and is input to the input voltage vin of converter 110, and is output to transformer
120.Transformer carries out transformation to setting voltage Vp to obtain output voltage.
Through the foregoing embodiment, setting voltage is converted input voltage by converter, transformer to setting voltage into
Row transformation realizes the wide-voltage range input of pfc circuit, for example, relative to existing pfc circuit, when output voltage is 380V,
Input voltage range becomes 20-300V by 65-230V, and high conversion efficiency is applicable to the demand of particular surroundings.
Specifically, with reference to Fig. 1 and Fig. 2, converter 110 includes first switch tube S1 and second switch S2, passes through control
The working condition of first switch tube S1 and second switch S2, conversion are input to the input voltage vin of converter 110 as setting electricity
Vp is pressed, and is exported to transformer 120, so that transformer 120 carries out transformation to the setting voltage Vp, and then transformer 120 exports
Corresponding output voltage Vout.
Further, by control first switch tube S1 and second switch S2, the input voltage vin of converter 110 with
Relationship between setting voltage Vp meets following formula: Vp=Vin/ (1-D), D indicate that control first switch tube S1 and second is opened
Close the duty ratio of the driving signal Qs of the working condition of pipe S2.And then after transformer 120 carries out transformation to the setting voltage Vp, if
The relationship between output voltage Vout that constant voltage Vp and transformer 120 are exported is Vout=Vp*Ns, Ns indication transformer
120 primary coil and the turn ratio of secondary coil, due to input terminal of the input terminal as pfc circuit 100 of converter 110,
Output end of the output end of transformer 120 as pfc circuit 100, the then input voltage vin and output voltage of the pfc circuit 100
The relationship of Vout is Vout=Vin*Ns/ (1-D).
Specifically, the working condition of first switch tube S1 and second switch S2 include: that first switch tube S1 and second open
Close that pipe S2 is in that off state, first switch tube S1 be in the conductive state and second switch S2 is in off state and the
One switching tube S1 is in off state and second switch S2 is in the conductive state.
The pfc circuit of above-described embodiment is described in detail below with reference to a physical circuit.
With reference to Fig. 2, first switch tube S1 and second switch S2 are respectively P-channel field-effect transistor (PEFT) pipe, first switch tube S1 with
Second switch S2 is connected in series, i.e., the source electrode of first switch tube S1 is connect with the drain electrode of second switch S2, second switch
The source electrode connection of S2 is with reference to ground.Driving signal Qs includes the first driving signal Qs1 and the second driving signal Qs2, the first driving letter
Number Qs1 is input to the grid of first switch tube S1, and the second driving signal Qs2 is input to the grid of second switch S2, i.e., and first
Driving signal Qs1 controls the working condition of first switch tube S1, and the second driving signal Qs2 controls the work shape of second switch S2
State, at this point, realizing converter 110 by the working condition of the first switch tube S1 and second switch S2 of control series connection
Input voltage vin is converted into setting voltage Vp and is exported to transformer 120.
It include first time period and second time period in the period of driving signal Qs in the present embodiment.At the first time
In section, the first driving signal Qs1 and the second driving signal Qs2 are all cut-off electric signal, so that first switch tube S1 and second is opened
It closes pipe S2 and is in off state；In second time period, the first driving signal Qs1 is complementary with the second driving signal Qs2, wherein
The first driving signal Qs1 phase for indicating the first driving signal Qs1 and the second driving signal Qs2 complementary with the second driving signal Qs2
Potential difference is 180 °, in this way, first switch tube S1 and second switch S2 are not simultaneously on state or off state, into
And another is in off state when as first switch tube S1 and second switch S2, one of them is in the conductive state.
Further, with reference to Fig. 2, converter 110 further includes first capacitor C1, the second capacitor C2, inductance L1 and third
Capacitor C3, wherein first capacitor C1 and the second capacitor C2 are connected in series with each other, the first capacitor C1 being connected in series with each other and second
One end of capacitor C2 is connect with reference to ground, first capacitor C1 and the second capacitor C2 with the drain electrode connection of first switch tube S1, the other end
Between node connect with one end of the primary coil of transformer 120, input terminal of the one end of inductance L1 as converter 110,
It is connect with input voltage vin, the other end of inductance L1 is connect with one end of third capacitor C3, the other end of third capacitor C3 and change
The other end of the primary coil of depressor 120 connects, the section between the grid and inductance L1 and third capacitor C3 of first switch tube S1
Point connection, the grid and source electrode of second switch S2 are connect with reference.
In the present embodiment, converter 110 is realized by the first switch tube S1 and second switch S2 of series connection
Boosting, relative to the Boost circuit in existing pfc circuit, in the input for realizing same range, first switch tube S1 and second is opened
It is small to close the pipe S2 voltage stress to be born, so that the pfc circuit of the present embodiment further realizes wide-voltage range input.
In order to protect first switch tube S1 and second switch S2, converter 110 further includes first resistor R1, second resistance
R2,3rd resistor R3, the 4th resistance R4 and the 5th resistance R5, wherein the grid of first switch tube S1 by first resistor R1 with
Inductance L1 connection, the first driving signal Qs1 are input to the grid of first switch tube S1, second switch S2 by second resistance R2
Grid by 3rd resistor R3 connection with reference to ground, the second driving signal Qs2 pass through the 4th resistance R4 be input to second switch
The grid of S2, the source electrode of second switch S2 is by the 5th resistance R5 connection with reference to ground.Certainly, in order to ensure transformer output
The secondary coil of output voltage Vout stable, transformer passes through rectification circuit, and then obtains output voltage Vout, the rectification circuit
Including rectifier diode and commutation capacitor, in the present embodiment and it is not construed as limiting.
It is described in detail below with reference to working principle of Fig. 3 a-3d equivalent circuit diagram to the pfc circuit in Fig. 2.
As shown in Figure 3a, since moment t0, pfc circuit is started to work, at this point, first switch tube S1 and second switch
S2 cut-off, the electric current i of inductance LLAnd the electric current ip of transformer is as shown, until moment t1, wherein moment t0 to moment t1
As first time period.
As shown in Figure 3b, in moment t1, the equivalent inductance Lr of transformer is started working, at this point, control second switch
Pipe S2 conducting, after a period of time, in moment t2, the electric current ip of transformer starts to reduce, and direction remains unchanged, such as Fig. 3 c institute
Show, when moment t3, the electric current ip of transformer is reduced to 0, at this point, the second capacitor C2 starts to discharge by transformer, transformation
The electric current ip's of device is contrary, and as shown in Figure 3d, after a period of time, in moment t4, the equivalent inductance Lr of transformer starts
It works, at this point, control first switch tube S1 conducting, generates no-voltage turn-on condition, loss is small, after a period of time, from the moment
T5 starts, and the process of first switch tube S1 conducting is identical as the process that above-mentioned second switch S2 is connected, wherein when moment t1-
Carving t5 indicates second time period.Therein, it can be seen that by the first switch tube S1 and second switch S2 of series connection come real
It now boosts, switching tube can realize that no-voltage is connected, and be lost small.
As shown in figure 4, being the structural schematic diagram of Switching Power Supply embodiment of the invention, which includes rectifier
410 and pfc circuit 420, wherein the input terminal of rectifier 410 is electrically connected with exchange, the input terminal and rectifier of pfc circuit 420
410 output end connects, output end is connect with load 430.
The rectifier 410 can be bridge rectifier, the rectifying device being made of two or four diodes.In this implementation
In example, rectifier 410 is made of four diodes.
Pfc circuit 420 includes converter 110 and transformer 120, the output of the input terminal and converter 110 of transformer 120
End connection, input terminal of the input terminal of converter 110 as the pfc circuit 420, the output end of transformer 120 is as PFC electricity
The output end on road 420 is connect with load 430, in which:
Converter 110 is converted the input voltage vin for being input to converter 110 as setting voltage Vp and is exported to transformer
120,120 couples of setting voltage Vp of transformer carry out transformation to obtain output voltage Vout and export to load 430.
Through the foregoing embodiment, setting voltage is converted input voltage by converter, transformer to setting voltage into
Row transformation, realizes the wide-voltage range input of pfc circuit, and then realizes the wide-voltage range input of Switching Power Supply, for example, relatively
In existing pfc circuit, when output voltage is 380V, input voltage range becomes 20-300V by 65-230V, high conversion efficiency,
It is applicable to the demand of particular surroundings.
With reference to Fig. 4, which further includes control circuit 450, and with reference to Fig. 5, converter 110 includes first switch
Pipe S1 and second switch S2, control circuit 450 control the working condition of first switch tube S1 and second switch S2, so as to become
It is setting voltage that parallel operation 110, which is converted and is input to the input voltage of converter 110,.Specifically, with reference to Fig. 5, first switch tube S1 with
Second switch S2 is connected in series, i.e., the source electrode of first switch tube S1 is connect with the drain electrode of second switch S2, second switch
The source electrode connection of S2 is with reference to ground.The control circuit 450 is connect with the grid of first switch tube S1 and second switch S2, for defeated
For driving signal Qs to control the working condition of first switch tube S1 and second switch S2, driving signal Qs includes the first driving out
Signal Qs1 and the second driving signal Qs2, the first driving signal Qs1 are input to the grid of first switch tube S1, the second driving signal
Qs2 is input to the grid of second switch S2, i.e. the first driving signal Qs1 controls the working condition of first switch tube S1, and second
Driving signal Qs2 controls the working condition of second switch S2, at this point, the first switch tube S1 and the being connected in series by control
Input voltage vin is converted to setting voltage Vp realizing converter 110 and exported to transformation by the working condition of two switching tube S2
Device 120.
In the present embodiment, pfc circuit 420 is described in detail in the above-described embodiments, refers to above-described embodiment,
Details are not described herein.
Further, with reference to Fig. 4, which further includes filter circuit 440, which is connected to whole
It flows between the output end of device 410 and the input terminal of pfc circuit 420, with reference to Fig. 5, which includes in parallel the
One filter capacitor C6 and the second filter capacitor C7, wherein one end of the first filter capacitor C6 and the second filter capacitor C7 in parallel
Connection is connected with reference to the output end of ground, the other end and rectifier 410 and the other end of inductance L1.
It should be noted that control circuit 450 includes voltage sample part, comparator etc., physical circuit is in the present embodiment
In be not construed as limiting, it is only different in the working condition of synchronization control first switch tube S1 and second switch S2.In addition, being
Ensureing the output voltage Vout stable for being input to load, the output of the secondary coil of transformer is needed by rectifying part, into
And output voltage Vout is obtained, for example, with reference to Fig. 5, which includes rectifier diode D1, D2 and commutation capacitor C4, C5,
In the present embodiment and it is not construed as limiting.
As shown in fig. 6, being the structural schematic diagram of display embodiment of the invention, which includes 610 He of mainboard
Switching Power Supply 620, wherein mainboard 610 is connect with the output end of Switching Power Supply 620, and the input terminal of Switching Power Supply 620 connects exchange
Electricity, such as household 220V.Switching Power Supply 620 elaborates in the above-described embodiments, please refers to above-described embodiment, and needs
Illustrate, the Switching Power Supply 620 in above-described embodiment is powered display 600, in addition to the mainboard of display 600, also
Backlight module in display 600 can be powered.In the present embodiment, the structure of mainboard 610 is not construed as limiting, it can be with
Using the mainboard 610 of any structure.
Through the foregoing embodiment, display can work in the input voltage of wide scope, suitable for special environment.
The above is only embodiments of the present invention, are not intended to limit the scope of the invention, all to utilize the present invention
Equivalent structure or equivalent flow shift made by specification and accompanying drawing content is applied directly or indirectly in other relevant technologies
Field similarly includes in scope of patent protection of the invention.
Claims (6)
1. a kind of circuit of power factor correction characterized by comprising
Converter, input terminal of the input terminal as the circuit of power factor correction；
Transformer, input terminal are connect with the output end of the converter, and output end is defeated as the circuit of power factor correction
Outlet；
Wherein, the converter includes first switch tube and second switch, the first switch tube and the second switch
It is connected in series, the working condition by controlling the first switch tube and second switch is input to the converter to convert
Input voltage is setting voltage, and by the setting voltage output to the transformer, the transformer is to the setting voltage
Transformation is carried out to obtain output voltage；
The converter further includes first resistor, second resistance, 3rd resistor, the 4th resistance and the 5th resistance, wherein described
The grid of one switching tube is connect with the first resistor, the second resistance；The grid of the second switch is by described the
The connection of three resistance is with reference to ground, and the source electrode of the second switch is by the 5th resistance connection with reference to ground；
The converter further includes first capacitor, the second capacitor, inductance and third capacitor, wherein the first capacitor and
Two capacitors are connected in series with each other, and one end of the first capacitor and second capacitor that are connected in series with each other is opened with described first
Close the node and the change of the drain electrode connection, other end connection of pipe with reference to ground, between the first capacitor and second capacitor
One end of the primary coil of depressor connects, and one end of the inductance is as the input terminal of the converter, the other end and described the
One end of three capacitors connects, and the other end of the third capacitor is connect with the other end of the primary coil of the transformer, described
The grid of first switch tube is connected by node between the first resistor and the inductance and the third capacitor, and described the
The grid of two switching tubes is connect by the 3rd resistor with reference；
Relationship between the input voltage and the output voltage meets following formula: Vout=Vin*Ns/ (1-D), Vin table
Show that the input voltage of the converter, Vout indicate that the output voltage, Ns indicate the primary coil and secondary of the transformer
The turn ratio of coil, D indicate the duty ratio of the driving signal of the working condition of the control first switch tube and second switch,
Wherein, the driving signal includes the first driving signal, the second driving signal, and first driving signal passes through second electricity
Resistance is input to the grid of the first switch tube, and second driving signal is input to described second by the 4th resistance and opens
Close the grid of pipe.
2. circuit according to claim 1, which is characterized in that the work of the first switch tube and the second switch
As state include: the first switch tube and the second switch is in off state, the first switch tube is in and leads
Logical state and the second switch are in off state and the first switch tube is in off state and described second opens
It is in the conductive state to close pipe.
3. a kind of Switching Power Supply characterized by comprising
Rectifier, input terminal are electrically connected with exchange；
Circuit of power factor correction, input terminal are connect with the output end of the rectifier, and output end and load connect；
Wherein, the circuit of power factor correction includes converter and transformer, the input terminal of the converter and the rectification
The output end of device connects, and the input terminal of the transformer is connect with the output end of the converter, output end and load connect；
The converter includes first switch tube and second switch, and the first switch tube is connected company with the second switch
It connects, the input electricity for being input to the converter is converted by controlling the working condition of the first switch tube and second switch
Pressure is setting voltage, and by the setting voltage output to the transformer, the transformer becomes the setting voltage
Pressure is to obtain output voltage and export to the load；
The converter further includes first resistor, second resistance, 3rd resistor, the 4th resistance and the 5th resistance, wherein described
The grid of one switching tube is connect with the first resistor, the second resistance；The grid of the second switch is by described the
The connection of three resistance is with reference to ground, and the source electrode of the second switch is by the 5th resistance connection with reference to ground；
The converter further includes first capacitor, the second capacitor, inductance and third capacitor, wherein the first capacitor and
Two capacitors are connected in series with each other, and one end of the first capacitor and second capacitor that are connected in series with each other is opened with described first
Close the node and the change of the drain electrode connection, other end connection of pipe with reference to ground, between the first capacitor and second capacitor
One end of the primary coil of depressor connects, and one end of the inductance is as the input terminal of the converter, the other end and described the
One end of three capacitors connects, and the other end of the third capacitor is connect with the other end of the primary coil of the transformer, described
The grid of first switch tube is connected by node between the first resistor and the inductance and the third capacitor, and described the
The grid of two switching tubes is connect by the 3rd resistor with reference；
Relationship between the input voltage and the output voltage meets following formula: Vout=Vin*Ns/ (1-D), Vin table
Show that the input voltage of the converter, Vout indicate that the output voltage, Ns indicate the primary coil and secondary of the transformer
The turn ratio of coil, D indicate the duty ratio of the driving signal of the working condition of the control first switch tube and second switch,
Wherein, the driving signal includes the first driving signal, the second driving signal, and first driving signal passes through second electricity
Resistance is input to the grid of the first switch tube, and second driving signal is input to described second by the 4th resistance and opens
Close the grid of pipe.
4. Switching Power Supply according to claim 3, which is characterized in that the Switching Power Supply further includes control circuit, is used
In the working condition for controlling the first switch tube and the second switch so that converter conversion is input to the change
The input voltage of parallel operation is the setting voltage.
5. Switching Power Supply according to claim 4, which is characterized in that the first switch tube and the second switch
Working condition include: the first switch tube and the second switch is in off state, at the first switch tube
In the on state second switch be in off state and the first switch tube is in off state and described
Two switching tubes are in the conductive state.
6. a kind of display, which is characterized in that including mainboard and to mainboard offer power supply as appointed in claim 3-5
Switching Power Supply described in one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611075177.3A CN106452050B (en) | 2016-11-29 | 2016-11-29 | A kind of circuit of power factor correction, Switching Power Supply and display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611075177.3A CN106452050B (en) | 2016-11-29 | 2016-11-29 | A kind of circuit of power factor correction, Switching Power Supply and display |
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| CN106452050A CN106452050A (en) | 2017-02-22 |
| CN106452050B true CN106452050B (en) | 2019-06-11 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1599221A (en) * | 2004-07-23 | 2005-03-23 | 西安交通大学 | Single-phase large power single-stage converter topological and control method based on bridge circuit |
| CN1960149A (en) * | 2005-11-04 | 2007-05-09 | 周春香 | DC/DC isolation convertor of new type twin pipe double-end type soft switch |
| CN101262730A (en) * | 2008-04-28 | 2008-09-10 | 佛山市美博照明有限公司 | Self-adapted sliding frequency trigger ignition method for high-voltage gas discharging lamp electronic rectifier |
| CN101588135A (en) * | 2008-05-21 | 2009-11-25 | 弗莱克斯电子有限责任公司 | Resonant power factor correction converter |
| CN104917412A (en) * | 2015-07-17 | 2015-09-16 | 东南大学 | Single stage power factor correction phase-shift full bridge topology circuit |
-
2016
- 2016-11-29 CN CN201611075177.3A patent/CN106452050B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1599221A (en) * | 2004-07-23 | 2005-03-23 | 西安交通大学 | Single-phase large power single-stage converter topological and control method based on bridge circuit |
| CN1960149A (en) * | 2005-11-04 | 2007-05-09 | 周春香 | DC/DC isolation convertor of new type twin pipe double-end type soft switch |
| CN101262730A (en) * | 2008-04-28 | 2008-09-10 | 佛山市美博照明有限公司 | Self-adapted sliding frequency trigger ignition method for high-voltage gas discharging lamp electronic rectifier |
| CN101588135A (en) * | 2008-05-21 | 2009-11-25 | 弗莱克斯电子有限责任公司 | Resonant power factor correction converter |
| CN104917412A (en) * | 2015-07-17 | 2015-09-16 | 东南大学 | Single stage power factor correction phase-shift full bridge topology circuit |
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| CN106452050A (en) | 2017-02-22 |
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