CN108075663A - The control circuit of Switching Power Supply - Google Patents
The control circuit of Switching Power Supply Download PDFInfo
- Publication number
- CN108075663A CN108075663A CN201610972830.XA CN201610972830A CN108075663A CN 108075663 A CN108075663 A CN 108075663A CN 201610972830 A CN201610972830 A CN 201610972830A CN 108075663 A CN108075663 A CN 108075663A
- Authority
- CN
- China
- Prior art keywords
- power supply
- control port
- switching power
- control circuit
- control
- 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
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
- 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
- H02M3/33507—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 with automatic control of the output voltage or current, e.g. flyback converters
-
- 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
- H02M3/33571—Half-bridge at primary side of an isolation transformer
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
-
- 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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0009—Devices or circuits for detecting current in a 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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0016—Control circuits providing compensation of output voltage deviations using feedforward of disturbance parameters
-
- 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
- H02M1/0064—Magnetic structures combining different functions, e.g. storage, filtering or transformation
-
- 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
- H02M3/01—Resonant DC/DC converters
-
- 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
- H02M3/01—Resonant DC/DC converters
- H02M3/015—Resonant DC/DC converters with means for adaptation of resonance frequency, e.g. by modification of capacitance or inductance of resonance circuit
-
- 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
- H02M3/33538—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 of the forward type
- H02M3/33546—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 of the forward type with automatic control of the output voltage or current
- H02M3/33553—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 of the forward type with automatic control of the output voltage or current with galvanic isolation between input and output of both the power stage and the feedback loop
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/382—Switched mode power supply [SMPS] with galvanic isolation between input and output
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The application provides a kind of control circuit of Switching Power Supply, which there is the high side switching elements being connected in series between the positive potential end of DC power supply and ground terminal and low-side switch element, the control circuit to have：Central control circuit, it has the first control port, the second control port and the 3rd control port, wherein, first control port and the second control port export the control signal that high side switching elements and low-side switch element are turned on and disconnected respectively, and the equiva lent impedance between the 3rd control port and ground terminal is used for resonant frequency during configuration switch power work；And compensation circuit, between the 3rd control port and ground terminal, for the variable quantity of the output voltage according to Switching Power Supply, the equiva lent impedance between the 3rd control port and ground terminal is adjusted, to adjust resonant frequency during Switching Power Supply work.The present embodiment can improve the accuracy of output current.
Description
Technical field
The present invention relates to power technique fields more particularly to a kind of control circuits of Switching Power Supply.
Background technology
Switching Power Supply is that the time ratio of the turn-on and turn-off of switch element is controlled using electronic circuit, and maintenance is stablized defeated
Go out a kind of power supply of voltage.
Switching Power Supply can have rectification circuit, smooth circuit, switch element, transformer, outlet side rectification circuit and in
Heart control circuit etc..Wherein, rectification circuit and smooth circuit can carry out the alternating current of input rectification and smooth；It controls at the center
Circuit processed can have ON/OFF control port, which can export control signal, be opened with control
The turn-on and turn-off of element are closed, so that the electric signal after smooth carries out resonance；Transformer is transported to the electric signal of resonance
The outlet side of Switching Power Supply；The electric signal that outlet side rectification circuit will be delivered to the outlet side of Switching Power Supply carries out rectification, with shape
It is exported into output electric signal.
In general, central control circuit can also have resonant frequency control port, the resonant frequency control port and switch
Impedance between power ground end can control the resonant frequency of Switching Power Supply at work, which can influence this and open
The precision (accuracy) of the output current in powered-down source, therefore, by the resonant frequency control for reasonably setting central control circuit
Impedance between port processed and Switching Power Supply ground terminal, can make the output current of Switching Power Supply have higher precision.Center
Control circuit can be semiconductor integrated circuit, for example, Infineon (Infineon) ICL5101 chips.
Fig. 1 is a schematic diagram of the central controller of the prior art, as shown in Figure 1, central controller 1 is led
Logical/shut-off control port 2 and 3 can be connected with switch element 4 and 5 respectively, also, the resonant frequency control of central controller 1
Resistance R50 and R35 are connected between port 9 processed and ground terminal GND, wherein, resistance R50 and R35 are used to that Switching Power Supply to be controlled to exist
Resonant frequency during work.
It should be noted that the introduction of technical background is intended merely to above it is convenient the technical solution of the application is carried out it is clear,
Complete explanation, and facilitate the understanding of those skilled in the art and illustrate.Cannot merely because these schemes the application's
Background section is set forth and thinks that above-mentioned technical proposal is known to those skilled in the art.
The content of the invention
In existing Switching Power Supply, when the load of output terminal changes, the voltage and current of output terminal also can be with
Change, generate fluctuation so as to cause output current, this variation by loading the output current caused by changing can be with
It is represented by load regulation rate (load regulation).
The inventors of the present application found that in existing Switching Power Supply, since the resonant frequency of central control circuit controls
Impedance between port and Switching Power Supply ground terminal is set to fixed value, and therefore, the resonant frequency of Switching Power Supply is fixed, and
And when the load of output terminal changes, it can not come to adjust the accuracy of output current, institute by adjusting resonant frequency in time
With, it is difficult to improve the accuracy of output current, load regulation rate is higher, for example, about ± 10%.
The embodiment of the present application provides a kind of control circuit of Switching Power Supply, according to the variable quantity of the output voltage of Switching Power Supply
Resonant frequency during Switching Power Supply work is adjusted, so as to reduce load conciliation rate, improves the accuracy of output current.
According to the embodiment of the present application in a first aspect, providing a kind of control circuit of Switching Power Supply, which has
The high side switching elements and low-side switch element being connected in series between the positive potential end of DC power supply and ground terminal, the control
Circuit processed has：
Central control circuit(such as ICL5101), there is the first control port, the second control port and the 3rd control terminal
Mouthful, wherein, first control port and second control port are exported respectively to high side switching elements and described
The control signal that low-side switch element is turned on and disconnected, it is equivalent between the 3rd control port and the ground terminal
Impedance is used to set the resonant frequency during Switching Power Supply work；And
Compensation circuit, between the 3rd control port and the ground terminal, for according to the Switching Power Supply
Output voltage variable quantity, the equiva lent impedance between the 3rd control port and the ground terminal is adjusted, with described in adjustment
Resonant frequency when Switching Power Supply works.
According to the second aspect of the embodiment of the present application, wherein, the compensation circuit has：
Detection unit is used to detect the variable quantity of the output voltage of the Switching Power Supply, to generate detection signal；And
Adjustment unit, according to the detection signal, adjust between the 3rd control port and the ground terminal etc.
Imitate impedance.
According to the third aspect of the embodiment of the present application, wherein, the compensation circuit also has：
Filter unit is filtered the detection signal.
According to the fourth aspect of the embodiment of the present application, wherein, the compensation circuit also has：
Diode, the detection signal for being used to make to flow to the 3rd control port pass through.
According to the 5th of the embodiment of the present application the aspect, wherein, the Switching Power Supply has transformer, which has one
Secondary winding and secondary winding, the detection unit include auxiliary winding, and the auxiliary winding is coupled with the secondary winding, described
Induced current corresponding with the variable quantity of the output voltage of the Switching Power Supply is generated in auxiliary winding, as the detection letter
Number.
According to the 6th of the embodiment of the present application aspect, wherein, the adjustment unit is according to the detection signal, described in adjustment
The current potential of 3rd control port, to adjust the equiva lent impedance.
According to the 7th of the embodiment of the present application the aspect, wherein, the adjustment unit includes resistance.
The advantageous effect of the embodiment of the present application is：Switch electricity is adjusted according to the variable quantity of the output voltage of Switching Power Supply
Resonant frequency when source works so as to reduce load conciliation rate, improves the accuracy of output current.
With reference to following explanation and attached drawing, only certain exemplary embodiments of this invention is disclosed in detail, specifies the original of the present invention
Reason can be in a manner of adopted.It should be understood that embodiments of the present invention are not so limited in scope.In appended power
In the range of the spirit and terms of profit requirement, embodiments of the present invention include many changes, modifications and are equal.
The feature for describing and/or showing for a kind of embodiment can be in a manner of same or similar one or more
Used in a other embodiment, with the feature in other embodiment it is combined or substitute other embodiment in feature.
It should be emphasized that term "comprises/comprising" refers to the presence of feature, one integral piece, step or component when being used herein, but simultaneously
It is not excluded for the presence or additional of one or more other features, one integral piece, step or component.
Description of the drawings
Included attached drawing is used for providing being further understood from the embodiment of the present invention, which constitutes one of specification
Point, for illustrating embodiments of the present invention, and come together with word description to illustrate the principle of the present invention.Under it should be evident that
Attached drawing in the description of face is only some embodiments of the present invention, for those of ordinary skill in the art, is not paying wound
On the premise of the property made is laborious, other attached drawings are can also be obtained according to these attached drawings.In the accompanying drawings：
Fig. 1 is a schematic diagram of existing central control circuit；
Fig. 2 is a schematic diagram of the control circuit of the embodiment of the present application 1.
Specific embodiment
Referring to the drawings, by following specification, foregoing and other feature of the invention will be apparent.In specification
In attached drawing, only certain exemplary embodiments of this invention is specifically disclosed, which show the portions for the principle that the present invention wherein may be employed
Divide embodiment, it will thus be appreciated that the invention is not restricted to described embodiment, on the contrary, the present invention includes falling into appended power
Whole modifications, modification and equivalent in the range of profit requirement.
Embodiment 1
The embodiment of the present application 1 provides a kind of control circuit of Switching Power Supply, and Fig. 2 is a schematic diagram of the control circuit.
As shown in Fig. 2, control circuit 200 is used to be controlled in Switching Power Supply 100.In the present embodiment, the switch
The load of power supply 100 can be the electronic equipment for needing DC power supply, such as light emitting diode (LED) etc..
In the following, the structure of Switching Power Supply 100 is illustrated first.
As shown in Fig. 2, Switching Power Supply 100 can have rectification circuit DB and smoothing capacity C1, wherein, rectification circuit DB
It such as can be diode bridge circuit, rectification can be carried out to the alternating voltage that AC power AC is inputted；Smoothing capacity C1 can
Voltage after rectification circuit DB rectifications is carried out smoothly to form DC power supply.
Switching Power Supply 100 can also have high side switching elements Q1 and low-side switch element Q2, high side switch member
Part Q1 and low-side switch element Q2 are connected between the positive potential end of DC power supply and ground terminal.High side switching elements Q1 and
Low-side switch element Q2 for example can be mos field effect transistor (MOSFET).
Switching Power Supply 100 can also have transformer T and resonant capacitance C2, transformer T to have first winding P1 and two
Secondary winding S1, S2, wherein, the series circuit and low-side switch element Q2 that first winding P1 and resonant capacitance C2 are formed are simultaneously
Connection, also, the leakage inductance between first winding P1 and secondary winding S1, S2 can be represented as reactor Lr.
Switching Power Supply 100 can also have rectifier diode D1, D2 and smoothing capacity C3, wherein, rectifier diode D1, D2
It is connected respectively with secondary winding S1 and S2, for carrying out rectification to the sensing voltage on secondary winding S1 and S2；Smoothing capacity C3
For carrying out smoothly forming output voltage V to the voltage after rectificationOUT1。
As shown in Fig. 2, control circuit 200 can make Q1 and Q2 be alternately turned on and disconnect, so that output voltage VOUT1It is permanent
It is fixed, wherein, Q1 and Q2 can complementally be turned on and disconnect.
In the following, control circuit 200 is illustrated.
As shown in Fig. 2, control circuit 200 includes：Central control circuit 201 and compensation circuit 202.
In the present embodiment, central control circuit 201 can have the first control port 2011, the second control port 2012
With the 3rd control port 2013, wherein, the first control port 2011 and the second control port 2012 export and high-pressure side are opened respectively
Close the control signal that element Q1 and low-side switch element Q2 is turned on and disconnected；3rd control port 2013 and ground terminal it
Between equiva lent impedance for configuration switch power supply 100 work when resonant frequency.
In the present embodiment, compensation circuit 202 can be between the 3rd control port 2013 and ground terminal, for basis
The output voltage V of Switching Power Supply 100OUT1Variable quantity, adjust the equiva lent impedance between the 3rd control port 2013 and ground terminal,
To adjust resonant frequency when Switching Power Supply 100 works.
Through this embodiment, can be adjusted according to the variable quantity of the output voltage of Switching Power Supply when Switching Power Supply works
Resonant frequency thereby, it is possible to reduce load conciliation rate, improves the accuracy of output current.
In the present embodiment, central control circuit 201 is except having the first control port 2011, the second control port 2012
Outside the 3rd control port 2013, there can also be other control ports.Central control circuit 201 can be semiconductor collection
Into circuit chip, for example, Infineon (Infineon) ICL5101 chips, certain the present embodiment is without being limited thereto, central control circuit
201 can also be other chips.On the concrete structure and operation principle of central control circuit 201, the prior art is may be referred to,
It will not be described for the present embodiment.
As shown in Fig. 2, in the present embodiment, compensation circuit 202 can have detection unit 2021 and adjustment unit 2022,
Wherein, detection unit 2021 can be used for the output voltage V of detection switch power supply 100OUT1Variable quantity, with generation detection letter
Number；Adjustment unit 2022 can adjust the equiva lent impedance between the 3rd control port 2013 and ground terminal according to the detection signal.
In the present embodiment, detection unit 2021 can include auxiliary winding P2, and auxiliary winding P2 can be with secondary winding
S1 is coupled, also, the output voltage V with Switching Power Supply 100 can be generated in auxiliary winding P2OUT1Variable quantity corresponding induct
Electric current, the induced current can be by as the detection signals.It should be noted that the present embodiment can be without being limited thereto, detection is single
Member 2021 can also have other compositions.
In the present embodiment, the detection signal that adjustment unit 2022 can be generated according to detection unit 2021, adjustment the 3rd
The current potential of control port 2013, so as to adjust the equiva lent impedance between the 3rd control port 2013 and ground terminal, for example, adjustment is single
Member 2022 can include resistance R51.It should be noted that the present embodiment can be without being limited thereto, adjustment unit 2022 can also have
Be made of other, for example, adjustment unit 2022 can include be arranged between the 3rd control port 2013 and ground terminal can
Become resistance, adjustment unit 2022 according to the detection signal, can adjust the resistance value of the variable resistor, so as to adjust the 3rd control
Equiva lent impedance between port 2013 and ground terminal.
As shown in Fig. 2, in the present embodiment, compensation circuit 202 can also have filter unit 2023, filter unit 2023
The detection signal that can be generated to detection unit 2021 is filtered, and filters out the interference signal in the detection signal as a result,.Example
Such as, which can include the low-pass filter being made of capacitance C34 and resistance R56, and thereby, it is possible to filter detection
High-frequency interferencing signal in signal.
As shown in Fig. 2, in the present embodiment, compensation circuit 202 can also have diode D21, diode D21 to be used for
Pass through the detection signal for flowing to the 3rd control port 2013.
In the present embodiment, it is connected with electricity between the 3rd control port 2013 of central control circuit 201 and ground terminal GND
R50 and R35 is hindered, wherein, in no detection signal, by resistance R50 and R35 configuration switch 100 resonance at work of power supply
Frequency, have detection signal in the case of, compensation circuit 202 by adjusting between the 3rd control port 2013 and ground terminal etc.
Impedance is imitated, to adjust resonant frequency when Switching Power Supply 100 works.
As shown in Fig. 2, in the present embodiment, output voltage VOUT1Variation causes to be generated in auxiliary winding P2 as detection letter
Number sensing electric current, the sensing electric current is by diode D21 rectifications, and the electric current after rectification capacitance C34 and resistance R56 by being made of
Low-pass filter filtering, filtered current flowing resistance R51 improves the current potential of the 3rd control port 2013, as a result, the
Equiva lent impedance between three control ports 2013 and ground terminal is adjusted, so that resonance frequency when Switching Power Supply 100 works
Rate changes.
In the present embodiment, it is possible to it is adjusted according to the variable quantity of the output voltage of Switching Power Supply when Switching Power Supply works
Resonant frequency, thereby, it is possible to improve the accuracy of output current, the load regulation rate of output current is about ± 4%.
The application is described above in association with specific embodiment, it will be appreciated by those skilled in the art that this
A little descriptions are all exemplary, and are not the limitation to the application protection domain.Those skilled in the art can be according to the application
Spirit and principle various variants and modifications are made to the application, these variants and modifications are also within the scope of application.
Claims (7)
1. a kind of control circuit of Switching Power Supply, which has goes here and there between the positive potential end of DC power supply and ground terminal
The high side switching elements and low-side switch element, the control circuit for joining connection have：
Central control circuit has the first control port, the second control port and the 3rd control port, wherein, described first
Control port and second control port export respectively to the high side switching elements and the low-side switch element into
Row conducting and the control signal disconnected, the equiva lent impedance between the 3rd control port and the ground terminal are described for setting
Resonant frequency when Switching Power Supply works；And
Compensation circuit, between the 3rd control port and the ground terminal, for according to the defeated of the Switching Power Supply
Go out the variable quantity of voltage, the equiva lent impedance between the 3rd control port and the ground terminal is adjusted, to adjust the switch
Resonant frequency during power work.
2. control circuit as described in claim 1, wherein, the compensation circuit has：
Detection unit is used to detect the variable quantity of the output voltage of the Switching Power Supply, to generate detection signal；And
Adjustment unit according to the detection signal, adjusts the equivalent resistance between the 3rd control port and the ground terminal
It is anti-.
3. control circuit as claimed in claim 2, wherein, the compensation circuit also has：
Filter unit is filtered the detection signal.
4. control circuit as claimed in claim 2, wherein, the compensation circuit also has：
Diode, the detection signal for being used to make to flow to the 3rd control port pass through.
5. control circuit as claimed in claim 2, wherein,
The Switching Power Supply has transformer, which has first winding and secondary winding,
The detection unit includes auxiliary winding, and the auxiliary winding is coupled with the secondary winding, raw in the auxiliary winding
Into the corresponding induced current of variable quantity of the output voltage with the Switching Power Supply, as the detection signal.
6. control circuit as claimed in claim 2, wherein,
The adjustment unit is according to the detection signal, the current potential of adjustment the 3rd control port, to adjust the equivalent resistance
It is anti-.
7. control circuit as claimed in claim 2, wherein,
The adjustment unit includes resistance.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610972830.XA CN108075663A (en) | 2016-11-07 | 2016-11-07 | The control circuit of Switching Power Supply |
| DE202017106452.2U DE202017106452U1 (en) | 2016-11-07 | 2017-10-25 | Control circuit for a switching power supply |
| ATGM239/2017U AT17797U1 (en) | 2016-11-07 | 2017-10-31 | Control circuit for a switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610972830.XA CN108075663A (en) | 2016-11-07 | 2016-11-07 | The control circuit of Switching Power Supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108075663A true CN108075663A (en) | 2018-05-25 |
Family
ID=61302004
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610972830.XA Pending CN108075663A (en) | 2016-11-07 | 2016-11-07 | The control circuit of Switching Power Supply |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN108075663A (en) |
| AT (1) | AT17797U1 (en) |
| DE (1) | DE202017106452U1 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1845436A (en) * | 2006-04-10 | 2006-10-11 | 吴壬华 | Method and device for controlling resonant transformer |
| CN101056061A (en) * | 2006-04-14 | 2007-10-17 | 艾默生网络能源系统有限公司 | Method and system for modulating and controlling resonant circuit |
| US20070262794A1 (en) * | 2006-05-10 | 2007-11-15 | Houfei Chen | On-die anti-resonance structure for integrated circuit |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI474601B (en) * | 2009-10-08 | 2015-02-21 | Acbel Polytech Inc | High conversion efficiency of the pulse mode resonant power converter |
| CN102281002B (en) * | 2010-06-09 | 2014-05-14 | 光宝电子(广州)有限公司 | Resonant-type electric switching circuit |
| DE102012007477B4 (en) * | 2012-04-13 | 2024-02-22 | Tridonic Gmbh & Co Kg | Method for operating an LLC resonant converter for a lamp, converter and LED converter |
-
2016
- 2016-11-07 CN CN201610972830.XA patent/CN108075663A/en active Pending
-
2017
- 2017-10-25 DE DE202017106452.2U patent/DE202017106452U1/en active Active
- 2017-10-31 AT ATGM239/2017U patent/AT17797U1/en not_active IP Right Cessation
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1845436A (en) * | 2006-04-10 | 2006-10-11 | 吴壬华 | Method and device for controlling resonant transformer |
| CN101056061A (en) * | 2006-04-14 | 2007-10-17 | 艾默生网络能源系统有限公司 | Method and system for modulating and controlling resonant circuit |
| US20070262794A1 (en) * | 2006-05-10 | 2007-11-15 | Houfei Chen | On-die anti-resonance structure for integrated circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| DE202017106452U1 (en) | 2018-02-08 |
| AT17797U1 (en) | 2023-03-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105305848B (en) | No bridge type converter | |
| CN103621179B (en) | For simplifying the drive circuit of form factor solid state light source lamp | |
| CN105071655B (en) | Self-adaptive constant on-time controlled switching power supply, controller and control method | |
| US8717791B2 (en) | Bridgeless boost PFC circuits and systems | |
| CN104488354B (en) | Drive circuit between fluorescent lamp ballast and LED | |
| CN103490629B (en) | Switched-mode power supply and two benches DC to DC transducer | |
| US10741325B2 (en) | Inductive power transfer apparatus with AC and DC output | |
| US10433379B2 (en) | Power distribution | |
| CN105939554B (en) | LED light modulating devices and LED drive power | |
| CN103155703A (en) | Circuit arrangement for operating at least two semiconductor light sources | |
| US9237621B1 (en) | Current control circuit and method for floating IC driven buck-boost converter | |
| CN110506382A (en) | High side signaling interface in power converter | |
| US20140177291A1 (en) | Self-excited push-pull converter | |
| CN107078644B (en) | Operation circuit, the operating method of LED converter and operation circuit powered to lighting means | |
| CN107885128A (en) | The high-power resistive load of continuously adjustabe based on alternating expression PWM | |
| CN108463943A (en) | The resonant power converter with Power MOSFET of circuit of synchronous rectification | |
| KR20130135757A (en) | Apparatus for controlling led string | |
| EP3284319A1 (en) | Converter for light sources | |
| CN205283404U (en) | New fly -Buck -Boost isolated form DC -DC converter circuit topology | |
| CN108075663A (en) | The control circuit of Switching Power Supply | |
| CN106602850B (en) | A kind of power supply ripple suppression circuit and method from coupling | |
| CN107634746A (en) | Semiconductor device | |
| CN208174546U (en) | A kind of medical switch power source adapter | |
| CN207601668U (en) | Programmable voltage clamp circuit | |
| CN206611612U (en) | A kind of proximity magnetic induction switch control chip |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180525 |
|
| RJ01 | Rejection of invention patent application after publication |