CN108933532A - One kind is for stablizing inverse-excitation type AC power source output system - Google Patents
One kind is for stablizing inverse-excitation type AC power source output system Download PDFInfo
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- CN108933532A CN108933532A CN201810583154.6A CN201810583154A CN108933532A CN 108933532 A CN108933532 A CN 108933532A CN 201810583154 A CN201810583154 A CN 201810583154A CN 108933532 A CN108933532 A CN 108933532A
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- control device
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- capacitor
- power source
- output
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
-
- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- 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
Abstract
The present invention provides one kind and is used to stablize inverse-excitation type AC power source output system, including：Full bridge rectifier controls chip, and first control device, second control device, transformer T, differential circuit, electric current, which flows backward, controls chip, sync control device；When first control device is opened, this signal retains the class triangular wave on upper edge by differential circuit, flows backward the driving signal of chip as trigger current, to forcibly close sync control device, prevents electric current reverse irrigation from causing output voltage unstable.It avoids full bridge rectifier from damaging, effectively stablizes the output voltage of inverse-excitation type AC power source.Control chip can be by connecting with system output, obtain the output voltage of output end, according to the fluctuation of output voltage, obtain current output voltage range, when there is superthreshold, chip is controlled by control first control device, second control device and sync control device turn off route in time, avoid burning out for component.
Description
Technical field
The present invention relates to Electric signal processing fields, more particularly to one kind is for stablizing inverse-excitation type AC power source output system.
Background technique
Energy conservation and environmental protection has become the development trend of electronic product under the overall situation of global energy anxiety, how to improve the energy
Effective rate of utilization reduction influenced current energy waste and caused by environment, various countries have launched corresponding
Energy certification, such as the U.S. are made that the certification of 80PLUS to PC power source, to improve the transfer efficiency of power supply, avoid unnecessary
The wasting of resources.
Because output end obtains energy when primary side winding disconnects power supply, inverse-excitation type AC power source is suitble to inverse-excitation type AC power source
Small-power power and various power supply adaptors.There is inverse-excitation type AC power source inductive current discontinuous mode and inductive current to connect
Discontinuous Conduction mode.Inductive current discontinuous mode is stored in all energy in transformer with ton and all turns in flyback period toff
Move on to output end.It is next that there is inductor current continuous mode the part energy being stored in transformer to remain at the end toff
The beginning in ton period.
When inverse-excitation type AC power source input voltage changes or load current is in larger model in a larger range
When enclosing interior variation, two kinds of working methods are crossed over, therefore flyback converter is required in inductive current discontinuous mode and inductance
Continuous current mode can steady operation.But be in design it is relatively difficult, usually can be with inductive current discontinuous mode
Or inductor current continuous mode critical state makees design basis, and is equipped with Controlled in Current Mode and Based, although this mode can be solved effectively
Certainly control problem when inductive current discontinuous mode, but circuit can not be eliminated in inductor current continuous mode and interfere unstable ask
Topic and electric current flow backward instability problem and cause the unstable of inverse-excitation type AC power source.
Summary of the invention
In order to overcome the deficiencies in the prior art described above, the present invention provides a kind of for stablizing the output of inverse-excitation type AC power source
System, including：Full bridge rectifier controls chip, first control device, second control device, transformer T, differential circuit, electricity
Stream flows backward control chip, sync control device；
The input terminal of full bridge rectifier is connect with AC power source, and the output end of full bridge rectifier is controlled with first respectively
Device first end, second control device first end and the connection of transformer T first input end；Second control device second end and change
The connection of the second input terminal of depressor T；Control chip first end connect with first control device second end, controls chip second end and the
The connection of two control device third ends, control chip third end are connect with differential circuit first end, differential circuit second end and electric current
Flow backward control chip first end connection, electric current flows backward control chip second end and connect with sync control device first end, synchronous control
Device second end processed is connect with transformer T second output terminal, and the first output end of transformer T connects system output one, synchronous control
Device third processed end connects system output two.
Preferably, further include：Photo-coupler and voltage stabilizing chip；
Photo-coupler first end is connect with control chip, and photo-coupler second end is connect with voltage stabilizing chip first end, pressure stabilizing
Chip second end is connect with system output one.
Preferably, first control device includes：First field-effect tube V1；
The pole the G connection of first field-effect tube V1 is connect with control chip first end；
The pole S of first field-effect tube V1 is grounded；
The pole D of first field-effect tube V1 is connect with the output end of full bridge rectifier and transformer T first input end respectively.
Preferably, second control device includes：Second field-effect tube V2, diode VD, capacitor C1 and resistance R；
Capacitor C1 first end, resistance R first end, the output end and transformer T first input end of full bridge rectifier are common
Connection；
Capacitor C1 second end and resistance R second end are connect with diode VD cathode respectively, diode VD anode, transformer T
Second input terminal and the second field-effect tube V2D are extremely connected jointly；Second pole field-effect tube V2S ground connection, the second field-effect tube V2G
Pole is connect with control chip and differential circuit respectively.
Preferably, sync control device includes：Third field-effect tube V3, synchronous rectifying controller；
The third pole field-effect tube V3D is connect with transformer T second output terminal, and the third pole field-effect tube V3S and system export
Two connection of end；The third pole field-effect tube V3G is connect with synchronous rectifying controller first end, synchronous rectifying controller second end and electricity
Stream flows backward control chip connection.
Preferably, further include：Capacitor C2, capacitor C3, capacitor C4；
Capacitor C2 first end, capacitor C3 first end and capacitor C4 first end are connect with the first output end of transformer T respectively；
Capacitor C2 second end, capacitor C3 second end and capacitor C4 second end connect with sync control device third end respectively
It connects.
Preferably, further include：Diode D；
The pole D with the first field-effect tube V1, the output end of full bridge rectifier connect the anode of diode D respectively；
The cathode of diode D is connected with capacitor C1 first end, resistance R first end and transformer T first input end respectively.
Preferably, EMI filter is connected between the input terminal and AC power source of full bridge rectifier；Full-bridge rectification electricity
The output end on road by conjugation inductance L respectively with first control device first end, second control device first end and transformer T
First input end connection.
As can be seen from the above technical solutions, the present invention has the following advantages that：
It controls chip and chip is controlled using PFC+PWM, system increases differential circuit, when first control device is opened
It waits, this signal retains the class triangular wave on upper edge by differential circuit, flows backward the driving signal of chip, as trigger current to force
Sync control device is closed, prevents electric current reverse irrigation from causing output voltage unstable.It avoids full bridge rectifier from damaging, effectively stablizes
The output voltage of inverse-excitation type AC power source.
Control chip can obtain the output voltage of output end, according to output voltage by connecting with system output
Fluctuation obtains current output voltage range, and when there is superthreshold, control chip passes through control first control device, the second control
Device and sync control device turn off route in time, avoid burning out for component.
Detailed description of the invention
In order to illustrate more clearly of technical solution of the present invention, attached drawing needed in description will be made below simple
Ground introduction, it should be apparent that, drawings in the following description are only some embodiments of the invention, for ordinary skill
For personnel, without creative efforts, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is for stablizing inverse-excitation type AC power source output system schematic diagram；
Fig. 2 is for stablizing inverse-excitation type AC power source output system embodiment schematic diagram.
Specific embodiment
It in order to make the invention's purpose, features and advantages of the invention more obvious and easy to understand, below will be with specific
Examples and drawings, the technical solution protected to the present invention are clearly and completely described, it is clear that implementation disclosed below
Example is only a part of the embodiment of the present invention, and not all embodiment.Based on the embodiment in this patent, the common skill in this field
Art personnel all other embodiment obtained without making creative work belongs to the model of this patent protection
It encloses.
The present embodiment provides one kind for stablizing inverse-excitation type AC power source output system, as shown in Figure 1, including：Full-bridge is whole
Current circuit 2 controls chip 3, and first control device 11, second control device 12, transformer T, differential circuit 5, electric current, which flows backward, to be controlled
Coremaking piece 6, sync control device 4；The input terminal of full bridge rectifier 2 is connect with AC power source, the output of full bridge rectifier 2
End is connected with 11 first end of first control device, 12 first end of second control device and transformer T first input end respectively；The
Two control devices, 12 second end is connect with the second input terminal of transformer T；Control 3 first end of chip and first control device 11 second
End connection, control 3 second end of chip connects with 12 third end of second control device, control 3 third end of chip and differential circuit 5 the
One end connection, 5 second end of differential circuit are flowed backward control 6 first end of chip with electric current and are connect, and electric current flows backward control 6 second end of chip
It is connect with 4 first end of sync control device, 4 second end of sync control device is connect with transformer T second output terminal, transformer T
First output end connects system output one, and 4 third end of sync control device connects system output two.
Based on when inverse-excitation type AC power source input voltage change in a larger range or load current compared with
In a wide range of when variation, cross over two kinds of working methods, thus flyback converter require in inductive current discontinuous mode and
Inductor current continuous mode can steady operation.But be in design it is relatively difficult, usually can be discontinuous with inductive current
Mode or inductor current continuous mode critical state make design basis, and are equipped with Controlled in Current Mode and Based, although this mode can have
It imitates various when solving the problems, such as inductive current discontinuous mode but intrinsic not without circuit is eliminated in inductor current continuous mode
Stable problem and electric current flow backward the unstable problem that instability problem causes inverse-excitation type AC power source,
It controls chip 3 and chip is controlled using PFC+PWM, increase differential circuit, when first control device 11 is opened
When to wait MOSFET grid be high level, this signal retains the class triangular wave high level on upper edge by differential circuit, as triggering electricity
Stream flows backward the driving signal of chip, to forcibly close sync control device 4, prevents electric current reverse irrigation from causing output voltage unstable.
In the present embodiment, as shown in Fig. 2, system further includes：Photo-coupler 7 and voltage stabilizing chip 8；7 first end of photo-coupler
It is connect with control chip 3,7 second end of photo-coupler is connect with 8 first end of voltage stabilizing chip, and 8 second end of voltage stabilizing chip and system are defeated
Outlet one connects.
Chip 3 is controlled by the available voltage to system output of photo-coupler 7 and voltage stabilizing chip 8, in turn, by obtaining
The output voltage taken to control the control first control device 11 of chip 3, and the conducting of second control device 12 can be to avoid electric current
Flow backward instability problem.
In the present embodiment, first control device 11 includes：First field-effect tube V1；The pole G of first field-effect tube V1 connects
It is connect with control 3 first end of chip；The pole S of first field-effect tube V1 is grounded；The pole D of first field-effect tube V1 is whole with full-bridge respectively
The output end of current circuit 2 is connected with transformer T first input end.
Certain first control device 11 can also be controlled using other modes, and specific constructive form is without limitation.
In the present embodiment, second control device 12 includes：Second field-effect tube V2, diode VD, capacitor C1 and resistance
R；Capacitor C1 first end, resistance R first end, the output end and transformer T first input end of full bridge rectifier 2 connect jointly；
Capacitor C1 second end and resistance R second end are connect with diode VD cathode respectively, diode VD anode, and transformer T second is inputted
End and the second field-effect tube V2D are extremely connected jointly；Second pole field-effect tube V2S ground connection, the second pole field-effect tube V2G respectively with
It controls chip 3 and differential circuit 5 connects.Certain second control device 12 can also be controlled using other modes, specific to tie
Configuration formula is without limitation.
In the present embodiment, sync control device 4 includes：Third field-effect tube V3, synchronous rectifying controller 13；Third field effect
Should the pole pipe V3D connect with transformer T second output terminal, the third pole field-effect tube V3S is connect with system output two；Third field effect
Should the pole pipe V3G connect with 13 first end of synchronous rectifying controller, 13 second end of synchronous rectifying controller and electric current flow backward control core
Piece 6 connects.Synchronous rectifying controller 13 plays the control to third field-effect tube V3, and then controls the output of transformer T.And
And chip 3 is controlled by the available voltage to system output of photo-coupler 7 and voltage stabilizing chip 8, control chip 3 passes through control
Synchronous rectifying controller 13 controls third field-effect tube V3, plays and electric current is avoided to flow backward instability problem.
In the present embodiment, system further includes：Capacitor C2, capacitor C3, capacitor C4；
Capacitor C2 first end, capacitor C3 first end and capacitor C4 first end are connect with the first output end of transformer T respectively；
Capacitor C2 second end, capacitor C3 second end and capacitor C4 second end are connect with 4 third end of sync control device respectively.
Capacitor C2, capacitor C3, capacitor C4 play the pressure stabilization function to transformer T output.
In the present embodiment, system further includes：Diode D；The anode of the diode D pole D with the first field-effect tube V1 respectively,
The output end of full bridge rectifier 2 connects；The cathode of diode D respectively with capacitor C1 first end, resistance R first end and transformation
The connection of device T first input end.Diode D plays the role of electric current one-way.
In the present embodiment, EMI filter 1 is connected between the input terminal and AC power source of full bridge rectifier 2；Full-bridge
The output end of rectification circuit 2 by conjugation inductance L respectively with 11 first end of first control device, 12 first end of second control device
And transformer T first input end connection.
EMI filter 1, conjugation inductance L play filter action.The usual range of electric main is 110V~220V, first
EMI filter circuit is first passed through, the EMI interference of inverse-excitation type switch power-supply is reduced, to meet the EMC certification of various countries；Using full-bridge
Pulsation high voltage direct current is converted into after rectification and power frequency filter capacitor；Using PFC boost circuit for harmonic wave in electromagnetic compatibility
Testing current reduces electric current higher hamonic wave with this, reduces to characterized by city-power, reduces energy consumption and is converted to high voltage direct current；By PWM
High-pressure pulsating direct current is converted into low pressure pulsating direct current by control circuit and transformer, completes primary side circuit conversion；Most pass through afterwards
It crosses after synchronous rectification and is converted into the low-voltage direct of low ripple, used for load.
Inverse-excitation type AC power source is that each class of electronic devices runs well indispensable premise, to improve efficiency the reduction energy
Waste, synchronous rectification scheme replaces the best means of the diode rectification of traditional type, and efficiency is able to ascend 5 percentage points of left sides
It is right.It is rectified in synchronous rectification scheme with MOSFET, conduction voltage drop only has 0.1V, and high current rectifier diode conduction voltage drop
In 1V or more, influence of the rectifier diode to efficiency is very big.
In inductor current continuous mode, EMI filter 1, conjugation inductance L eliminates the instability problem of circuit interference.
Chip 3 is controlled, first control device 11, second control device 12 is used in combination, with inductive current discontinuous mode
Or inductor current continuous mode critical state makees design basis, and is equipped with Controlled in Current Mode and Based, effectively solves inductive current and does not connect
Various problems when Discontinuous Conduction mode.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment refer to mutually.
Description and claims of this specification and term " first ", " second ", " third " " in above-mentioned attached drawing
Four " etc. if there is being to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should be understood that
The data used in this way are interchangeable under appropriate circumstances, so that the embodiment of the present invention described herein can be in addition at this
In illustrate or description those of other than sequence implement.In addition, term " includes " and " having " and their any deformation, meaning
Figure, which is to cover, non-exclusive includes.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (8)
1. one kind is for stablizing inverse-excitation type AC power source output system, which is characterized in that including：Full bridge rectifier (2), control
Chip (3), first control device (11), second control device (12), transformer (T), differential circuit (5), electric current flow backward control
Chip (6), sync control device (4)；
The input terminal of full bridge rectifier (2) is connect with AC power source, and the output end of full bridge rectifier (2) is controlled with first respectively
Device (11) first end processed, second control device (12) first end and the connection of transformer (T) first input end；Second control dress
(12) second end is set to connect with the second input terminal of transformer (T)；Control chip (3) first end and first control device (11) second
End connection, control chip (3) second end are connect with second control device (12) third end, control chip (3) third end and differential
The connection of circuit (5) first end, differential circuit (5) second end are flowed backward control chip (6) first end with electric current and are connect, and electric current flows backward control
Coremaking piece (6) second end is connect with sync control device (4) first end, sync control device (4) second end and transformer (T) the
The connection of two output ends, the first output end of transformer (T) connect system output one, sync control device (4) third end connection system
System output end two.
2. according to claim 1 for stablizing inverse-excitation type AC power source output system, which is characterized in that
Further include：Photo-coupler (7) and voltage stabilizing chip (8)；
Photo-coupler (7) first end is connect with control chip (3), and photo-coupler (7) second end and voltage stabilizing chip (8) first end connect
It connects, voltage stabilizing chip (8) second end is connect with system output one.
3. according to claim 1 or 2 for stablizing inverse-excitation type AC power source output system, which is characterized in that
First control device (11) includes：First field-effect tube (V1)；
The pole the G connection of first field-effect tube (V1) is connect with control chip (3) first end；
The pole S of first field-effect tube (V1) is grounded；
The pole D of first field-effect tube (V1) connects with the output end of full bridge rectifier (2) and transformer (T) first input end respectively
It connects.
4. according to claim 3 for stablizing inverse-excitation type AC power source output system, which is characterized in that
Second control device (12) includes：Second field-effect tube (V2), diode (VD), capacitor (C1) and resistance (R)；
Capacitor (C1) first end, resistance (R) first end, the output end and transformer (T) first input end of full bridge rectifier (2)
Common connection；
Capacitor (C1) second end and resistance (R) second end are connect with diode (VD) cathode respectively, diode (VD) anode, transformation
The second input terminal of device (T) and the second field-effect tube (V2) D are extremely connected jointly；The second field-effect tube pole (V2) S ground connection, second
The pole effect pipe (V2) G is connect with control chip (3) and differential circuit (5) respectively.
5. according to claim 4 for stablizing inverse-excitation type AC power source output system, which is characterized in that
Sync control device (4) includes：Third field-effect tube (V3), synchronous rectifying controller (13)；
The third field-effect tube pole (V3) D is connect with transformer (T) second output terminal, and the third field-effect tube pole (V3) S and system are defeated
Outlet two connects；The third field-effect tube pole (V3) G is connect with synchronous rectifying controller (13) first end, synchronous rectifying controller
(13) second end is flowed backward control chip (6) with electric current and is connect.
6. according to claim 5 for stablizing inverse-excitation type AC power source output system, which is characterized in that
Further include：Capacitor (C2), capacitor (C3), capacitor (C4)；
Capacitor (C2) first end, capacitor (C3) first end and capacitor (C4) first end respectively with the first output end of transformer (T)
Connection；
Capacitor (C2) second end, capacitor (C3) second end and capacitor (C4) second end respectively with sync control device (4) third
End connection.
7. according to claim 5 for stablizing inverse-excitation type AC power source output system, which is characterized in that
Further include：Diode (D)；
The pole D with the first field-effect tube (V1), the output end of full bridge rectifier (2) connect the anode of diode (D) respectively；
The cathode of diode (D) respectively with capacitor (C1) first end, resistance (R) first end and transformer (T) first input end
Connection.
8. according to claim 1 for stablizing inverse-excitation type AC power source output system, which is characterized in that
EMI filter (1) is connected between the input terminal and AC power source of full bridge rectifier (2)；
The output end of full bridge rectifier (2) is controlled with first control device (11) first end, second respectively by conjugation inductance (L)
Device (12) first end processed and the connection of transformer (T) first input end.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810226638 | 2018-03-19 | ||
| CN2018102266385 | 2018-03-19 |
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| CN108933532A true CN108933532A (en) | 2018-12-04 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103595027A (en) * | 2013-11-07 | 2014-02-19 | 浪潮集团有限公司 | Method for preventing power output currents from flowing backwards |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103595027A (en) * | 2013-11-07 | 2014-02-19 | 浪潮集团有限公司 | Method for preventing power output currents from flowing backwards |
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Application publication date: 20181204 |