CN105896986B - A kind of controlled resonant converter and its control method - Google Patents
A kind of controlled resonant converter and its control method Download PDFInfo
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- CN105896986B CN105896986B CN201410777221.XA CN201410777221A CN105896986B CN 105896986 B CN105896986 B CN 105896986B CN 201410777221 A CN201410777221 A CN 201410777221A CN 105896986 B CN105896986 B CN 105896986B
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Abstract
The invention discloses a kind of controlled resonant converter and its control methods, belong to converters technical field.A kind of controlled resonant converter and its control method are made of input source, primary side LLC resonance circuits, transformer, auxiliary edge active Boost rectification circuits and output loading.Its secondary side rectification circuit is substituted for active Boost rectification circuits by the present invention on the basis of traditional LLC controlled resonant converter, what this both may be implemented converter determines frequency displacement phase control, it can also realize the frequency control of converter, it can also realize the frequency conversion of converter and determine frequency displacement and be combined control, convenient for the design of magnetic element, reduce the voltage stress of primary side switch pipe and secondary side rectifying tube, realize the Sofe Switch of each power semiconductor, voltage gain range, efficiency and the power density of Lifting Transform device meet the needs of Width funtion gain ranging transformation occasion.
Description
Technical field
The present invention relates to a kind of controlled resonant converter and its control methods, belong to converters technical field, especially
Belong to isolated DC-direct current energy converter technique field.
Background technology
Isolated DC Width funtion gain ranging converter be suitable for require input and output electrical isolation and input voltage or
The wider occasion of output voltage range, this quasi-converter have in the every field such as generation of electricity by new energy, industry, civilian, aerospace
It is widely used.How to improve voltage gain range, efficiency and the power density of this quasi-converter is always the technical field
Important Problems of interest.
LLC resonant converter is to obtain the Width funtion gain ranging isolated converter of extensive concern in recent years, such as Fig. 1 institutes
Show.It can realize the Sofe Switch of all switching tubes when voltage gain is more than 1, be particularly suitable for high frequency, high power density
The application of occasion.However, traditional LLC resonant converter needs to realize the adjusting of output voltage by changing switching frequency, when
When load or input voltage fluctuation, switching frequency needs change in wide range, this gives the design and analysis of converter, control
Extreme difficulties are all brought with realizing.Therefore, when voltage gain wider range, under traditional LLC controlled resonant converter efficiency is apparent
Drop.
In Width funtion gain ranging occasion, scholars often combine LLC converters and three level or multilevel converter
Come, this quasi-converter generally use fixed-frequency control, but need many power semiconductors, increase cost and complexity, drops
Low reliability.Document " Haibing Hu, Xiang Fang, Frank Chen, Z.John Shen, Issa Batarseh.A
Modified High-Efficiency LLC Converter With Two Transformers for Wide Input-
Voltage Range Applications [J] .IEEE Transactions on Power Electronics, 2013,28
(4)：1946-1960. " proposes a kind of dual transformer structure, which can obviously increase voltage gain range, but same
Need many power semiconductors.
Invention content
The purpose of the present invention is in view of the deficiencies of the prior art, convert occasion for Width funtion gain ranging and provide a kind of resonance
The control method of converter.
The purpose of the present invention is achieved through the following technical solutions：
A kind of controlled resonant converter is by input source (Uin), primary side LLC resonance circuits (10), transformer (T), auxiliary edge active
Boost rectification circuits (20) and output loading (Ro) constitute, wherein primary side LLC resonance circuits (10) are by primary side first switch pipe
(S1), primary side second switch pipe (S2), primary side third switching tube (S3), the 4th switching tube (S of primary side4), resonant capacitance (Cr), resonance
Inductance (Lr) and magnetizing inductance (Lm) composition, auxiliary edge active Boost rectification circuits (20) are by the 5th switching tube (S of secondary side5), secondary side
6th switching tube (S6), pair side the first rectifier diode (D1), pair side the second rectifier diode (D2), the output filtering of secondary side first
Capacitance (Co1) and pair side the second output filter capacitor (Co2) composition；The primary side first switch pipe (S of the primary circuit (10)1)
Drain electrode is connected in primary side third switching tube (S3) drain electrode and input source (Uin) anode, primary side first switch pipe (S1) source electrode connect
In primary side second switch pipe (S2) drain electrode and resonant capacitance (Cr) one end, resonant capacitance (Cr) the other end be connected in resonance electricity
Feel (Lr) one end, resonant inductance (Lr) the other end be connected in magnetizing inductance (Lm) one end and transformer (T) primary side winding (NP)
Same Name of Ends, transformer (T) primary side winding (NP) non-same polarity be connected in magnetizing inductance (Lm) the other end, primary side third switch
Manage (S3) the 4th switching tube (S of source electrode and primary side4) drain electrode, the 4th switching tube (S of primary side4) source electrode be connected in primary side second and open
Close pipe (S2) source electrode and input source (Uin) negative terminal；Transformer (T) vice-side winding (NS) Same Name of Ends be connected in secondary side and have
The 5th switching tube (S of secondary side of source Boost rectification circuits (20)5) drain, pair side the first rectifier diode (D1) anode and pair
Side the second rectifier diode (D2) cathode, secondary side the first rectifier diode (D1) cathode be connected in secondary side first export filtered electrical
Hold (Co1) one end and output loading (Ro) one end, output loading (Ro) the other end be connected in the second output filter capacitor of secondary side
(Co2) one end and pair side the second rectifier diode (D2) anode, secondary side the second output filter capacitor (Co2) the other end be connected in
Secondary side the first output filter capacitor (Co1) the other end, transformer (T) vice-side winding (NS) non-same polarity and secondary side the 6th open
Close pipe (S6) drain electrode, the 6th switching tube (S of secondary side6) source electrode be connected in the 5th switching tube (S of secondary side5) source electrode.
A kind of method for controlling frequency conversion of controlled resonant converter is as follows：First to fourth switching tube (the S1~S4) open
It is equal to close frequency, the 5th to the 6th switching tube (S5~S6) whole cycle complete switches off, first switch pipe (S1) and second switch pipe
(S2) complementation conducting, third switching tube (S3) and the 4th switching tube (S4) complementation conducting, first switch pipe (S1), second switch pipe
(S2), third switching tube (S3), the 4th switching tube (S4) duty ratio is equal, first switch pipe (S1) and the 4th switching tube (S4) simultaneously
It is connected, simultaneously turns off, second switch pipe (S2) and third switching tube (S3) simultaneously turn on, simultaneously turn off, by adjusting first to the
Four switching tube (S1~S4) switching frequency realize output voltage control, switching frequency more low output voltage gain is bigger, minimum
Output voltage gain highest when switching frequency.
The frequency conversion of a kind of controlled resonant converter and to determine the frequency displacement combination control method that is connected as follows：The controlled resonant converter is being opened
When closing frequency higher than lowermost switch frequency, the 5th switching tube (S5) and the 6th switching tube (S6) whole cycle is held off, first to
4th switching tube (S1~S4) switching frequency it is equal, first switch pipe (S1) and second switch pipe (S2) complementary conducting, third opens
Close pipe (S3) and the 4th switching tube (S4) complementation conducting, first switch pipe (S1), second switch pipe (S2), third switching tube (S3)、
4th switching tube (S4) duty ratio is equal, first switch pipe (S1) and the 4th switching tube (S4) simultaneously turn on, simultaneously turn off, second
Switching tube (S2) and third switching tube (S3) simultaneously turn on, simultaneously turn off, by adjusting first to fourth switching tube (S1~S4)
Switching frequency realizes the frequency control of output voltage, and switching frequency more low output voltage gain is bigger, and when lowermost switch frequency is defeated
Go out voltage gain highest；And the controlled resonant converter switching frequency be equal to lowermost switch frequency when, the 5th switching tube (S5) and
6th switching tube (S6) start to work, the first to the 6th switching tube (S1~S6) switching frequency it is equal and fixed, first switch pipe
(S1) and second switch pipe (S2) complementation conducting, third switching tube (S3) and the 4th switching tube (S4) complementation conducting, the 5th switching tube
(S5) and the 6th switching tube (S6) complementation conducting, first switch pipe (S1), second switch pipe (S2), third switching tube (S3), the 4th
Switching tube (S4), the 5th switching tube (S5) and the 6th switching tube (S6) duty ratio it is equal, first switch pipe (S1) and the 4th switch
Manage (S4) simultaneously turn on, simultaneously turn off, second switch pipe (S2) and third switching tube (S3) simultaneously turn on, simultaneously turn off, first opens
Close pipe (S1) open and be not later than the 6th switching tube (S constantly6) open the moment, third switching tube (S3) to open the moment not late
In the 5th switching tube (S5) open the moment, pass through adjust first switch pipe (S1) and the 6th switching tube (S6) between turn-on instant
Phase shifting angle realize that output voltage determines frequency displacement phase control, phase shifting angle is bigger, output voltage gain is bigger.
The essential distinction of technical solution of the present invention and existing technical solution is that frequency control both may be used in control program
Method, can also use frequency conversion and determine frequency displacement and be connected combination control method, and the buck adjusting to output, this scheme may be implemented
Convenient for the design of magnetic element, while the voltage stress of primary side switch pipe and secondary side rectifying tube can also be reduced, realize each power half
The Sofe Switch of conductor device, voltage gain range, efficiency and the power density of Lifting Transform device meet the change of Width funtion gain ranging
The demand that carry over closes.
The present invention has the advantages that：
(1) control mode, which both may be used, determines frequency displacement phase control method, can also use method for controlling frequency conversion, can also adopt
With frequency conversion and determines frequency displacement and be connected combination control method；
(2) full operating range or part working range can optimize the design of converter using frequency displacement phase control is determined；
(3) voltage gain range is wide, and Width funtion gain ranging is suitble to convert occasion；
(4) voltage of all switching devices can realize that voltage clamp, switching device voltage stress are low naturally；
(5) all switching devices can realize that Sofe Switch, conversion efficiency are high in full-load range；
(6) converter can be worked with HF switch, to effectively reduce the volume weight of inductance and transformer, be realized high
Power density；
Description of the drawings
Attached drawing 1 is traditional LLC resonant converter schematic diagram；
Attached drawing 2 is a kind of controlled resonant converter schematic diagram of the present invention；
Attached drawing 3 is that a kind of controlled resonant converter of the present invention uses key operation waveforms when determining frequency displacement phase control；
Attached drawing 4~8 is that a kind of controlled resonant converter of the present invention switchs the equivalent of mode using when determining frequency displacement phase control each
Circuit diagram；
Designation in the figures above：10 be primary side LLC resonance circuits；20 be auxiliary edge active Boost rectification circuits；T
For transformer；NPAnd NSThe respectively primary side winding and vice-side winding of transformer (T)；S1、S2、S3And S4Respectively primary side first,
Second, third and the 4th switching tube；S5And S6For the five, the 6th switching tube of secondary side；D1And D2For the first and second rectification of secondary side two
Pole pipe；LrFor resonant inductance；LmFor transformer (T) magnetizing inductance；CrFor resonant capacitance；Co1And Co2For output filter capacitor；RoFor
Output loading；UinFor input source；UoFor output voltage；iinFor the output current of input source；IoFor load current；iLrIt is humorous to flow through
Shake inductance (Lr) electric current；iLmTo flow through magnetizing inductance (Lm) electric current；uCrFor resonant capacitance (Cr) both ends voltage；iS1、iS2、
iS3And iS4Respectively flow into primary side switch pipe S1、S2、S3And S4Drain current；iS5S6To flow into secondary-side switch pipe S5Drain electrode
Electric current and S6Source current；isecTo flow out transformer (T) vice-side winding NSThe electric current of Same Name of Ends；iD1And iD2Respectively flow into
Secondary side rectifier diode D1And D2The electric current of anode；uGS1、uGS2、uGS3、uGS4、uGS5And uGS6Respectively switching tube S1、S2、S3、S4、
S5And S6Driving voltage；uDS1、uDS4And uDS6Respectively switching tube S1、S4And S6Drain-source voltage；t0、t1、t2、t3、t4And t5
For the time；TSIt is switch periods；D is secondary-side switch pipe S5And S6Relative to primary side switch pipe S1~S4Phase shift duty ratio.
Specific implementation mode
Technical scheme of the present invention is described in detail in conjunction with attached drawing.
As shown in Fig. 2, a kind of controlled resonant converter is by input source (Uin), primary side LLC resonance circuits (10), transformer
(T), auxiliary edge active Boost rectification circuits (20) and output loading (Ro) constitute, wherein primary side LLC resonance circuits (10) are by primary side
First switch pipe (S1), primary side second switch pipe (S2), primary side third switching tube (S3), the 4th switching tube (S of primary side4), resonance electricity
Hold (Cr), resonant inductance (Lr) and magnetizing inductance (Lm) composition, auxiliary edge active Boost rectification circuits (20) are by the switch of secondary side the 5th
Manage (S5), pair the 6th switching tube (S of side6), pair side the first rectifier diode (D1), pair side the second rectifier diode (D2), secondary side the
One output filter capacitor (Co1) and pair side the second output filter capacitor (Co2) composition；The primary side first of the primary circuit (10)
Switching tube (S1) drain electrode be connected in primary side third switching tube (S3) drain electrode and input source (Uin) anode, primary side first switch pipe
(S1) source electrode be connected in primary side second switch pipe (S2) drain electrode and resonant capacitance (Cr) one end, resonant capacitance (Cr) it is another
End is connected in resonant inductance (Lr) one end, resonant inductance (Lr) the other end be connected in magnetizing inductance (Lm) one end and transformer (T)
Primary side winding (NP) Same Name of Ends, transformer (T) primary side winding (NP) non-same polarity be connected in magnetizing inductance (Lm) the other end,
Primary side third switching tube (S3) the 4th switching tube (S of source electrode and primary side4) drain electrode, the 4th switching tube (S of primary side4) source electrode connect
In primary side second switch pipe (S2) source electrode and input source (Uin) negative terminal；Transformer (T) vice-side winding (NS) it is of the same name
End is connected in the 5th switching tube (S of secondary side of auxiliary edge active Boost rectification circuits (20)5) drain, secondary the first rectifier diode of side
(D1) anode and pair side the second rectifier diode (D2) cathode, secondary side the first rectifier diode (D1) cathode be connected in secondary side
First output filter capacitor (Co1) one end and output loading (Ro) one end, output loading (Ro) the other end be connected in secondary side
Two output filter capacitor (Co2) one end and pair side the second rectifier diode (D2) anode, the second output filter capacitor of secondary side
(Co2) the other end be connected in secondary side the first output filter capacitor (Co1) the other end, transformer (T) vice-side winding (NS) it is non-same
Name end and pair the 6th switching tube (S of side6) drain electrode, the 6th switching tube (S of secondary side6) source electrode be connected in the 5th switching tube (S of secondary side5)
Source electrode.
A kind of controlled resonant converter of the present invention can take following method for controlling frequency conversion in the specific implementation, and described first
To the 4th switching tube (S1~S4) switching frequency it is equal, the 5th to the 6th switching tube (S5~S6) whole cycle complete switches off,
One switching tube (S1) and second switch pipe (S2) complementation conducting, third switching tube (S3) and the 4th switching tube (S4) complementation conducting, the
One switching tube (S1), second switch pipe (S2), third switching tube (S3), the 4th switching tube (S4) duty ratio is equal, first switch pipe
(S1) and the 4th switching tube (S4) simultaneously turn on, simultaneously turn off, second switch pipe (S2) and third switching tube (S3) simultaneously turn on,
It simultaneously turns off, by adjusting first to fourth switching tube (S1~S4) switching frequency realize output voltage control, switching frequency
More low output voltage gain is bigger, output voltage gain highest when lowermost switch frequency.
A kind of controlled resonant converter of the present invention can take such as down coversion and determine frequency displacement and be combined control in the specific implementation
Method processed, the controlled resonant converter is when switching frequency is higher than lowermost switch frequency, the 5th switching tube (S5) and the 6th switching tube
(S6) whole cycle is held off, first to fourth switching tube (S1~S4) switching frequency it is equal, first switch pipe (S1) and the
Two switching tube (S2) complementation conducting, third switching tube (S3) and the 4th switching tube (S4) complementation conducting, first switch pipe (S1),
Two switching tube (S2), third switching tube (S3), the 4th switching tube (S4) duty ratio is equal, first switch pipe (S1) and the 4th switch
Manage (S4) simultaneously turn on, simultaneously turn off, second switch pipe (S2) and third switching tube (S3) simultaneously turn on, simultaneously turn off, pass through tune
Save first to fourth switching tube (S1~S4) switching frequency realize that the frequency control of output voltage, the lower output of switching frequency are electric
Press gain bigger, output voltage gain highest when lowermost switch frequency；And the controlled resonant converter switching frequency be equal to it is minimum
When switching frequency, the 5th switching tube (S5) and the 6th switching tube (S6) start to work, the first to the 6th switching tube (S1~S6) open
It is equal and fixed to close frequency, first switch pipe (S1) and second switch pipe (S2) complementation conducting, third switching tube (S3) opened with the 4th
Close pipe (S4) complementation conducting, the 5th switching tube (S5) and the 6th switching tube (S6) complementation conducting, first switch pipe (S1), second open
Close pipe (S2), third switching tube (S3), the 4th switching tube (S4), the 5th switching tube (S5) and the 6th switching tube (S6) duty ratio phase
Deng first switch pipe (S1) and the 4th switching tube (S4) simultaneously turn on, simultaneously turn off, second switch pipe (S2) and third switching tube
(S3) simultaneously turn on, simultaneously turn off, first switch pipe (S1) open and be not later than the 6th switching tube (S constantly6) open the moment,
Third switching tube (S3) open and be not later than the 5th switching tube (S constantly5) open the moment, pass through adjust first switch pipe (S1)
With the 6th switching tube (S6) phase shifting angle between turn-on instant realize output voltage determine frequency displacement phase control, phase shifting angle is bigger, defeated
It is bigger to go out voltage gain.
In the specific implementation, first switch pipe (S1) and second switch pipe (S2) switching signal between must be provided with rationally
Dead time to realize first switch pipe (S1) and second switch pipe (S2) Sofe Switch, third switching tube (S3) opened with the 4th
Close pipe (S4) switching signal between must be provided with rational dead time to realize third switching tube (S3) and the 4th switching tube
(S4) Sofe Switch；In the method for controlling frequency conversion, the 5th switching tube (S5) and the 6th switching tube (S6) complete in whole cycle
Shutdown；Determine frequency displacement phase control method described, the 5th switching tube (S5) and the 6th switching tube (S6) switching signal between then not
It needs that any dead time is arranged.
In the specific implementation, all switching tubes should select the semiconductor switch device with parasitic body diode, such as
Mos field effect transistor etc..If selected switching tube, should be without parasitic body diode
It drains and source electrode both ends anti-paralleled diode.
The purpose of the present invention is realize the transformation of the isolated DC of Width funtion gain ranging, in order to realize the purpose, the present invention
Its secondary side rectification circuit is substituted for active Boost rectification circuits on the basis of traditional LLC converter, control program both can be with
Using determining frequency displacement phase control method, method for controlling frequency conversion can also be used, frequency conversion can also be used and determine frequency displacement is combined control
Method may be implemented to adjust the buck of output, and this scheme is convenient for the design of magnetic element, while can also reduce primary side and open
The voltage stress for closing pipe and secondary side rectifying tube, realizes the Sofe Switch of each device for power switching, the voltage gain model of Lifting Transform device
It encloses, efficiency and power density, meets the needs of Width funtion gain ranging transformation occasion.
It can visually see from a kind of attached circuit structure of controlled resonant converter of the present invention shown in Fig. 2, the converter is former
The switching device on side is all input directly into voltage clamping, i.e. its voltage stress is equal to input voltage, and converter pair side is opened
Close the half that device is all directly no more than output voltage by output filter capacitor voltage clamping namely its voltage stress, primary side
Due to voltage spikes problem is all not present with all switching devices on secondary side, has the advantages that switching device voltage stress is low.
Assuming that all inductance, capacitance, switching tube and diode are all ideal component, ignore the first output filter capacitor Co1With
Second output filter capacitor Co2On voltage ripple, then the first output filter capacitor Co1With the second output filter capacitor Co2On
Voltage is equal to output voltage 0.5Uo。
Below by taking a kind of attached controlled resonant converter shown in Fig. 2 as an example, illustrate the present invention using work when determining frequency displacement phase control
Make principle.Attached drawing 3 gives key operation waveforms when frequency displacement phase control is determined in this controlled resonant converter use.It is of the invention a kind of humorous
Shaking, there are five types of switch mode altogether in half of switch periods for converter (hereinafter referred to as converter).
Switch 1 [t of mode0, t1]：t0Before moment, primary side second switch pipe (S2), primary side third switching tube (S3) and secondary side
5th switching tube (S5) conducting, resonance current is negative value, the 6th switching tube (S of secondary side6) body diode conducting, secondary side the 5th switchs
Manage (S5) and pair the 6th switching tube (S of side6) constitute branch flow through forward current, resonant capacitance (Cr) and resonant inductance (Lr) humorous
It shakes, input source forms counter voltage and is added in resonant capacitance (Cr), resonant inductance (Lr) and magnetizing inductance (Lm) constitute resonant cavity input
End, transformer (T) vice-side winding (NS) both end voltage is zero, magnetizing inductance (Lm) size of current remains unchanged；t0Moment, shutdown
Primary side second switch pipe (S2) and primary side third switching tube (S3), resonance current is from primary side first switch pipe (S1) body diode and
The 4th switching tube (S of primary side4) body diode afterflow, primary side first switch pipe (S1) and the 4th switching tube (S of primary side4) hourglass source electrode electricity
Pressure is 0, and the corresponding equivalent circuit of the mode is as shown in Figure 4.
Switch 2 [t of mode1, t2]：t1Moment opens primary side first switch pipe (S1) and the 4th switching tube (S of primary side4) can be with
Realize that no-voltage is open-minded, the 6th switching tube (S of secondary side6) body diode conducting, the 5th switching tube (S of secondary side5) and the secondary switch of side the 6th
Manage (S6) constitute branch flow through forward current, secondary side the first rectifier diode (D1) and pair side the second rectifier diode (D2) at
In off state, resonant capacitance (Cr) and resonant inductance (Lr) resonance, input source formed positive voltage be added in resonant capacitance (Cr), it is humorous
Shake inductance (Lr) and magnetizing inductance (Lm) constitute resonant cavity input terminal, transformer (T) vice-side winding (NS) both end voltage is zero,
Magnetizing inductance (Lm) size of current remains unchanged, the corresponding equivalent circuit of the mode is as shown in Figure 5.
Switch 3 [t of mode2, t3]：t2Moment, the 5th switching tube (S of secondary side5) shutdown, the 6th switching tube (S of secondary side6) realize zero
Voltage is open-minded, the 5th switching tube (S of secondary side5) and pair the 6th switching tube (S of side6) constitute branch current fall to 0, secondary side first
Rectifier diode (D1) conducting, resonant capacitance (Cr) and resonant inductance (Lr) resonance, magnetizing inductance (Lm) by output refraction voltage
(nP/nS*Uo) clamp, electric current linear rise, input source is by resonant cavity to output loading (Ro) energy is transmitted, which corresponds to
Equivalent circuit it is as shown in Figure 6.
Switch 4 [t of mode3, t4]：t3Moment, resonant inductance (Lr) electric current and magnetizing inductance (Lm) electric current is equal, resonant capacitance
(Cr), resonant inductance (Lr) and magnetizing inductance (Lm) three's common resonance, secondary side the first rectifier diode (D1) electric current drops to
Zero, realize that zero-current switching, the corresponding equivalent circuit of the mode are as shown in Figure 7.
Switch 5 [t of mode4, t5]：t4Moment, transformer (T) vice-side winding (NS) both end voltage drops to zero, secondary side the 5th
Switching tube (S5) body diode conducting, the 5th switching tube (S of secondary side5) and pair the 6th switching tube (S of side6) constitute branch flow through instead
To electric current, resonant capacitance (Cr) and resonant inductance (Lr) resonance, magnetizing inductance (Lm) size of current remains unchanged, which corresponds to
Equivalent circuit it is as shown in Figure 8.
t5After moment, lower half of switch periods start, and the course of work is similar, are not repeated to describe.
According to the description of the above-mentioned course of work it is found that each switching device of the converter to may be implemented no-voltage open-minded, two
A rectifier diode can realize zero-current switching, and diode reverse recovery problem, therefore, all switching devices is not present
All it is Sofe Switch working condition.In addition, the present invention is convenient for the design of magnetic element, can be promoted using when determining frequency displacement phase control
Output voltage gain range, efficiency and the power density of converter meet the needs of Width funtion gain ranging transformation occasion.
Claims (2)
1. a kind of method for controlling frequency conversion of controlled resonant converter, it is characterised in that：
A kind of controlled resonant converter is by input source (Uin), primary side LLC resonance circuits (10), transformer (T), auxiliary edge active
Boost rectification circuits (20) and output loading (Ro) constitute, wherein primary side LLC resonance circuits (10) are by primary side first switch pipe
(S1), primary side second switch pipe (S2), primary side third switching tube (S3), the 4th switching tube (S of primary side4), resonant capacitance (Cr), resonance
Inductance (Lr) and magnetizing inductance (Lm) composition, auxiliary edge active Boost rectification circuits (20) are by the 5th switching tube (S of secondary side5), secondary side
6th switching tube (S6), pair side the first rectifier diode (D1), pair side the second rectifier diode (D2), the output filtering of secondary side first
Capacitance (Co1) and pair side the second output filter capacitor (Co2) composition；
The primary side first switch pipe (S of the primary circuit (10)1) drain electrode be connected in primary side third switching tube (S3) drain electrode and defeated
Enter source (Uin) anode, primary side first switch pipe (S1) source electrode be connected in primary side second switch pipe (S2) drain electrode and resonant capacitance
(Cr) one end, resonant capacitance (Cr) the other end be connected in resonant inductance (Lr) one end, resonant inductance (Lr) the other end be connected in
Magnetizing inductance (Lm) one end and transformer (T) primary side winding (NP) Same Name of Ends, transformer (T) primary side winding (NP) it is non-same
Name end is connected in magnetizing inductance (Lm) the other end, primary side third switching tube (S3) the 4th switching tube (S of source electrode and primary side4) leakage
Pole, the 4th switching tube (S of primary side4) source electrode be connected in primary side second switch pipe (S2) source electrode and input source (Uin) negative terminal；
Transformer (T) vice-side winding (NS) Same Name of Ends be connected in the secondary sides the 5th of auxiliary edge active Boost rectification circuits (20) and open
Close pipe (S5) drain, pair side the first rectifier diode (D1) anode and pair side the second rectifier diode (D2) cathode, secondary side
First rectifier diode (D1) cathode be connected in secondary side the first output filter capacitor (Co1) one end and output loading (Ro) one
End, output loading (Ro) the other end be connected in secondary side the second output filter capacitor (Co2) one end and secondary the second rectifier diode of side
(D2) anode, secondary side the second output filter capacitor (Co2) the other end be connected in secondary side the first output filter capacitor (Co1) it is another
End, transformer (T) vice-side winding (NS) non-same polarity and pair the 6th switching tube (S of side6) drain electrode, the 6th switching tube of secondary side
(S6) source electrode be connected in the 5th switching tube (S of secondary side5) source electrode；
First to fourth switching tube (the S1~S4) switching frequency it is equal, the 5th to the 6th switching tube (S5~S6) whole cycle
It complete switches off, first switch pipe (S1) and second switch pipe (S2) complementation conducting, third switching tube (S3) and the 4th switching tube (S4)
Complementation conducting, first switch pipe (S1), second switch pipe (S2), third switching tube (S3), the 4th switching tube (S4) duty ratio phase
Deng first switch pipe (S1) and the 4th switching tube (S4) simultaneously turn on, simultaneously turn off, second switch pipe (S2) and third switching tube
(S3) simultaneously turn on, simultaneously turn off, by adjusting first to fourth switching tube (S1~S4) switching frequency realize output voltage
Control, switching frequency more low output voltage gain is bigger, output voltage gain highest when lowermost switch frequency.
2. a kind of frequency conversion of controlled resonant converter and determining frequency displacement and being connected combination control method, it is characterised in that：
A kind of controlled resonant converter is by input source (Uin), primary side LLC resonance circuits (10), transformer (T), auxiliary edge active
Boost rectification circuits (20) and output loading (Ro) constitute, wherein primary side LLC resonance circuits (10) are by primary side first switch pipe
(S1), primary side second switch pipe (S2), primary side third switching tube (S3), the 4th switching tube (S of primary side4), resonant capacitance (Cr), resonance
Inductance (Lr) and magnetizing inductance (Lm) composition, auxiliary edge active Boost rectification circuits (20) are by the 5th switching tube (S of secondary side5), secondary side
6th switching tube (S6), pair side the first rectifier diode (D1), pair side the second rectifier diode (D2), the output filtering of secondary side first
Capacitance (Co1) and pair side the second output filter capacitor (Co2) composition；
The primary side first switch pipe (S of the primary circuit (10)1) drain electrode be connected in primary side third switching tube (S3) drain electrode and defeated
Enter source (Uin) anode, primary side first switch pipe (S1) source electrode be connected in primary side second switch pipe (S2) drain electrode and resonant capacitance
(Cr) one end, resonant capacitance (Cr) the other end be connected in resonant inductance (Lr) one end, resonant inductance (Lr) the other end be connected in
Magnetizing inductance (Lm) one end and transformer (T) primary side winding (NP) Same Name of Ends, transformer (T) primary side winding (NP) it is non-same
Name end is connected in magnetizing inductance (Lm) the other end, primary side third switching tube (S3) the 4th switching tube (S of source electrode and primary side4) leakage
Pole, the 4th switching tube (S of primary side4) source electrode be connected in primary side second switch pipe (S2) source electrode and input source (Uin) negative terminal；
Transformer (T) vice-side winding (NS) Same Name of Ends be connected in the secondary sides the 5th of auxiliary edge active Boost rectification circuits (20) and open
Close pipe (S5) drain, pair side the first rectifier diode (D1) anode and pair side the second rectifier diode (D2) cathode, secondary side
First rectifier diode (D1) cathode be connected in secondary side the first output filter capacitor (Co1) one end and output loading (Ro) one
End, output loading (Ro) the other end be connected in secondary side the second output filter capacitor (Co2) one end and secondary the second rectifier diode of side
(D2) anode, secondary side the second output filter capacitor (Co2) the other end be connected in secondary side the first output filter capacitor (Co1) it is another
End, transformer (T) vice-side winding (NS) non-same polarity and pair the 6th switching tube (S of side6) drain electrode, the 6th switching tube of secondary side
(S6) source electrode be connected in the 5th switching tube (S of secondary side5) source electrode；
The controlled resonant converter is when switching frequency is higher than lowermost switch frequency, the 5th switching tube (S5) and the 6th switching tube (S6)
Whole cycle is held off, first to fourth switching tube (S1~S4) switching frequency it is equal, first switch pipe (S1) opened with second
Close pipe (S2) complementation conducting, third switching tube (S3) and the 4th switching tube (S4) complementation conducting, first switch pipe (S1), second open
Close pipe (S2), third switching tube (S3), the 4th switching tube (S4) duty ratio is equal, first switch pipe (S1) and the 4th switching tube (S4)
It simultaneously turns on, simultaneously turn off, second switch pipe (S2) and third switching tube (S3) simultaneously turn on, simultaneously turn off, by adjusting first
To the 4th switching tube (S1~S4) switching frequency realize the frequency control of output voltage, switching frequency gets over low output voltage gain
It is bigger, output voltage gain highest when lowermost switch frequency；And the controlled resonant converter is equal to lowermost switch frequency in switching frequency
When rate, the 5th switching tube (S5) and the 6th switching tube (S6) start to work, the first to the 6th switching tube (S1~S6) switching frequency
It is equal and fixed, first switch pipe (S1) and second switch pipe (S2) complementation conducting, third switching tube (S3) and the 4th switching tube
(S4) complementation conducting, the 5th switching tube (S5) and the 6th switching tube (S6) complementation conducting, first switch pipe (S1), second switch pipe
(S2), third switching tube (S3), the 4th switching tube (S4), the 5th switching tube (S5) and the 6th switching tube (S6) duty ratio it is equal,
First switch pipe (S1) and the 4th switching tube (S4) simultaneously turn on, simultaneously turn off, second switch pipe (S2) and third switching tube (S3)
It simultaneously turns on, simultaneously turn off, first switch pipe (S1) open and be not later than the 6th switching tube (S constantly6) open the moment, third
Switching tube (S3) open and be not later than the 5th switching tube (S constantly5) open the moment, pass through adjust first switch pipe (S1) and the
Six switching tube (S6) phase shifting angle between turn-on instant realize output voltage determine frequency displacement phase control, phase shifting angle is bigger, output electricity
Press gain bigger.
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| JP2018174648A (en) * | 2017-03-31 | 2018-11-08 | オムロン株式会社 | Llc resonance converter |
| IL255948A (en) * | 2017-11-27 | 2018-01-31 | Abramovici Tal | Constant frequency dc/dc power converter |
| CN108667303B (en) * | 2018-04-13 | 2019-08-20 | 华南理工大学 | A kind of phase-shifted full-bridge converter method for controlling frequency conversion based on load current |
| CN109698627B (en) * | 2018-12-24 | 2020-11-06 | 东北大学 | Full-bridge DC/DC converter based on switched capacitor and modulation strategy thereof |
| CN110380613B (en) * | 2019-08-21 | 2021-05-14 | 南京航空航天大学 | PWM (pulse-width modulation) plus phase shift control method for realizing ZVS (zero voltage switching) of four-tube converter |
| CN110768535B (en) * | 2019-10-22 | 2021-09-14 | 广州金升阳科技有限公司 | Wide gain control method of variable topology LLC resonant converter |
| CN111064368B (en) * | 2019-12-17 | 2021-02-23 | 珠海格力电器股份有限公司 | Frequency conversion control method and device, storage medium and semi-double bridge type resonant converter |
| CN111277145B (en) * | 2020-03-03 | 2021-10-29 | 合肥阳光电动力科技有限公司 | Control device and control method of DC-DC conversion circuit |
| CN112532059A (en) * | 2020-08-13 | 2021-03-19 | 西安理工大学 | Current sharing control method for interleaved parallel LLC |
| CN112366947A (en) * | 2020-11-02 | 2021-02-12 | 杭州瑞旗电子科技有限公司 | Control circuit of high-gain LLC resonant converter |
| CN112366949A (en) * | 2020-11-02 | 2021-02-12 | 杭州瑞旗电子科技有限公司 | High-gain LLC resonant converter |
| CN114268213B (en) * | 2022-03-01 | 2022-05-10 | 常州索维尔电子科技有限公司 | Soft switching circuit, control method and control device based on LLC circuit |
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