CN109302071A - A kind of all-wave active rectification type LLC resonant converter and its control strategy - Google Patents
A kind of all-wave active rectification type LLC resonant converter and its control strategy Download PDFInfo
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- CN109302071A CN109302071A CN201811233483.4A CN201811233483A CN109302071A CN 109302071 A CN109302071 A CN 109302071A CN 201811233483 A CN201811233483 A CN 201811233483A CN 109302071 A CN109302071 A CN 109302071A
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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
- H02M3/33592—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 having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
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Abstract
The invention discloses a kind of all-wave active rectification type LLC resonant converter and its control strategies, belong to converters technical field.The converter is made of input source, input bus capacitance, primary side switch network, resonant inductance, resonant capacitance, transformer, n (>=1) a secondary full-wave rectification switching network and output filter capacitor and output loading when all-wave active rectification switching network, m (>=0) are a secondary；When input voltage is near rated operation point, secondary side auxiliary active switch pipe is held off, and converter uses frequency control；When input voltage falls, the duty ratio of active switch is assisted by adjusting secondary side, maintains output voltage stabilization；The all-wave active rectification type LLC resonant converter can meet power-supply system simultaneously and maintain two kinds of demands to steady operation point efficiency and transient voltage dip, be particularly suitable for server power supply, rail traffic power supply etc. and power-supply system is required to have the application that power down keeps maintenance ability.
Description
Technical field
The present invention relates to a kind of all-wave active rectification type LLC resonant converter and its control strategies, belong to power electronics change
Exchanger technology field especially belongs to isolated DC-direct current energy converter technique field.
Background technique
With the development of information technology, many applications all use isolated DC power module to be powered, and need
Ask more and more, it is desirable that also higher and higher.Especially in occasions such as server, rail traffics, it is desirable that DC power supplier efficiency
It is high, small in size, while also wanting that output voltage stabilization can be maintained within a certain period of time when input voltage falls, guarantee system
It can complete the operation such as to save critical data, be switched to backup power source.In order to reach this purpose, it will usually it is female to increase input
Line capacitance size to guarantee power down time demand, but will increase the volume of converter.Further decrease bus capacitor body
Product, can maintain output voltage constant in wider input voltage range, while also take into account the work effect of steady operation point
Rate.
In recent years, traditional LLC controlled resonant converter because high-efficient, power density is high, it is at low cost due to be widely used.It
The Sofe Switch of all power semiconductors may be implemented, reduce electromagnetic interference, realize high frequency, therefore obtained extensive
Using.But when LLC resonant converter input voltage range is wider, the magnetizing inductance (L of converterm) it is smaller, caused by ring
Stream is bigger, and the efficiency of entire working range is also lower.Therefore, attached traditional LLC controlled resonant converter shown in FIG. 1 is not appropriate for
The wide occasion of input voltage range.
In order to expand the input voltage range of traditional LLC controlled resonant converter, converter steady-state operation efficiency is combined, text
Offer " Kim Moon-Young, Kim Bong-Chul, Park Ki-Bum, Moon Gun-Woo.LLC Series Resonant
Converter with Auxiliary Hold-Up Time Compensation Circuit[J].8th
International Conference on Power Electronics-ECCE Asia, 2011:628-633 " propose as
Attached secondary side shown in Fig. 3 adds the modified LLC converter of auxiliary winding.On the basis of original low gain operating mode, lead to
Whether crossing the incision of transformer (T) auxiliary winding, secondary side adds the modified LLC converter of auxiliary winding, and there are two types of work in total
Mode.When input voltage is near rated point, auxiliary winding is disconnected, and is not involved in work；When input voltage falls, auxiliary around
Group participates in work, Lifting Transform device gain.But work, when power down is kept, transformer works in asymmetrical state, exists partially
Magnetic, and the introducing of auxiliary winding reduce magnetic core utilization rate so that transformer complex process, is not easy to process.
Summary of the invention
In view of the deficiencies of the prior art, it is an object of the present invention to provide a kind of all-wave active rectification type LLC resonant converters
And its control strategy.
The purpose of the present invention is achieved through the following technical solutions:
A kind of all-wave active rectification type LLC resonant converter is by input source (Uin), input bus capacitance (Cin), it is former
Side switching network (10), resonant inductance (Lr), resonant capacitance (Cr), a secondary side all-wave active rectification of transformer (T), n (>=1)
A secondary side full-wave rectification switching network (30, k (k=n+1~n+m)) of switching network (20, k (k=1~n)), m (>=0), output
Filter capacitor (Co) and output loading (Ro) constitute, wherein transformer (Tk, k=1~n+m) primary side magnetizing inductance value be Lm；Institute
State the input both ends of primary side switch network (10) respectively with input source (Uin) both ends be connected, primary side switch network (10) it is defeated
Outlet a and resonant inductance (Lr) one end be connected, resonant inductance (Lr) other end and transformer (T1) primary side winding Same Name of Ends
It is connected, transformer (T1) primary side winding different name end and transformer (T2) primary side winding Same Name of Ends be connected, and so on, transformation
Device (Tk, k=1~n+m-1) primary side winding different name end and transformer (Tk+1, k=1~n+m-1) primary side winding Same Name of Ends
It is connected, transformer (Tn+m) primary side winding different name end and resonant capacitance (Cr) one end be connected, resonant capacitance (Cr) the other end
It is connected with the output end b of primary side switch network (10), transformer (Tk, k=1~n) vice-side winding Same Name of Ends and secondary side all-wave
The input terminal c of active rectification switching network (20, k (k=1~n))k(k=1~n) is connected, transformer (Tk, k=1~n) and pair side
The input terminal d of the centre cap of winding and secondary side all-wave active rectifying circuit (20, k (k=1~n))k(k=1~n) is connected,
Transformer (Tk, k=1~n) vice-side winding different name end and secondary side all-wave active rectification switching network (20, k (k=1~n))
Input terminal ek(k=1~n) is connected, transformer (Tk, k=n+1~n+m) vice-side winding Same Name of Ends and the secondary whole switch of side all-wave
The input terminal c of network (30, k (k=n+1~n+m))k(k=n+1~n+m) is connected, transformer (Tk, k=n+1~n+m) and pair side
The input terminal d of the centre cap of winding and secondary side full-wave rectifying circuit (30, k (k=n+1~n+m))k(k=n+1~n+m) phase
Even, transformer (Tk, k=n+1~n+m) vice-side winding different name end and secondary side full-wave rectification switching network (30, k (k=n+1
~n+m)) input terminal ek(k=n+1~n+m) is connected, secondary side all-wave active rectification switching network (20, k (k=1~n))
Export both ends, the positive and negative both ends of output of secondary side full-wave rectification switching network (30, k (k=n+1~n+m)) are filtered with output respectively
Capacitor (Co) positive and negative end, output loading (Ro) both ends be connected.
The primary side switch network (10) can be asymmetrical half-bridge switching network, be also possible to symmetrical half bridge switch net
Network can also be full-bridge switching network.
The pair side all-wave active rectification switching network (20, k (k=1~n)) is a kind of all-wave active rectification electricity of common cathode
Road, it is by the first rectifier diode (DK, 1, k=1~n), the second rectifier diode (DK, 2, k=1~n), third rectify two poles
Manage (DK, 3, k=1~n), the 4th rectification tetrode (DK, 4, k=1~n) and pair side auxiliary switch (SK, a, k=1~n) and structure
At the first rectifier diode (DK, 1, k=1~n) anode and third rectifier diode (DK, 3, k=1~n) anode, secondary side
The input terminal c of all-wave active rectification switching network (20, k (k=1~n))k(k=1~n) is connected, the first rectifier diode
(DK, 1, k=1~n) cathode and the second rectifier diode (DK, 2, k=1~n) cathode, auxiliary switch (SK, a, k=1~
N) drain electrode is connected, third rectifier diode (DK, 3, k=1~n) cathode and the 4th rectifier diode (DK, 4, k=1~n)
Cathode, output filter capacitor (Co) anode, output loading (Ro) anode be connected, the second rectifier diode (DK, 2, k=1
~n) anode and the 4th rectifier diode (DK, 4, k=1~n) anode, secondary side all-wave active rectification switching network (20, k
(k=1~n)) input terminal ek(k=1~n) is connected, auxiliary switch (SK, a, k=1~n) source electrode and secondary side all-wave have
The input terminal d of source rectifier switch network (20, k (k=1~n))k(k=1~n), output filter capacitor (Co) cathode, output
Load (Ro) cathode be connected.
The pair side all-wave active rectification switching network (20, k (k=1~n)) is a kind of all-wave active rectification electricity of common anode
Road, it is by the first rectifier diode (DK, 1, k=1~n), the second rectifier diode (DK, 2, k=1~n), third rectify two poles
Manage (DK, 3, k=1~n), the 4th rectification tetrode (DK, 4, k=1~n) and pair side auxiliary switch (SK, a, k=1~n) and structure
At the first rectifier diode (DK, 1, k=1~n) cathode and third rectifier diode (DK, 3, k=1~n) cathode, secondary side
The input terminal c of all-wave active rectification switching network (20, k (k=1~n))k(k=1~n) is connected, the first rectifier diode
(DK, 1, k=1~n) anode and the second rectifier diode (DK, 2, k=1~n) anode, auxiliary switch (SK, a, k=1~
N) source electrode is connected, third rectifier diode (DK, 3, k=1~n) anode and the 4th rectifier diode (DK, 4, k=1~n)
Anode, output filter capacitor (Co) cathode, output loading (Ro) cathode be connected, the second rectifier diode (DK, 2, k=1
~n) cathode and the 4th rectifier diode (DK, 4, k=1~n) cathode, secondary side all-wave active rectification switching network (20, k
(k=1~n)) input terminal ek(k=1~n) is connected, auxiliary switch (SK, a, k=1~n) drain electrode and secondary side all-wave have
The input terminal d of source rectifier switch network (20, k (k=1~n))k(k=1~n), output filter capacitor (Co) anode, output
Load (Ro) anode be connected.
The pair side all-wave active rectification switching network (20, k (k=1~n)) is a kind of all-wave with synchronous rectification
Active rectifying circuit, it is by the first rectifier diode (DK, 1, k=1~n), the second rectifier diode (DK, 2, k=1~n),
One synchronous rectification switch pipe (SK, s1, k=1~n), the second synchronous rectification switch pipe (SK, s2, k=1~n) and auxiliary switch
(SK, a, k=1~n) and it constitutes, the first rectifier diode (DK, 1, k=1~n) anode and the first synchronous rectification switch pipe
(SK, s1, k=1~n) source electrode, secondary side all-wave active rectification switching network (20, k (k=1~n)) input terminal ck(k=1~
N) it is connected, the first rectifier diode (DK, 1, k=1~n) cathode and the second rectifier diode (DK, 2, k=1~n) cathode,
Auxiliary switch (SK, a, k=1~n) drain electrode be connected, the first synchronous rectification switch pipe (SK, s1, k=1~n) drain electrode and
Two synchronous rectification switch pipe (SK, s2, k=1~n) drain electrode, output filter capacitor (Co) anode, output loading (Ro) just
Extremely it is connected, the second rectifier diode (DK, 2, k=1~n) anode and the second synchronous rectification switch pipe (SK, s2, k=1~n)
The input terminal e of source electrode, pair side all-wave active rectifying circuit (20, k (k=1~n))k(k=1~n) is connected, auxiliary switch
(SK, a, k=1~n) source electrode and secondary side all-wave active rectification switching network (20, k (k=1~n)) input terminal dk(k=1
~n), output filter capacitor (Co) cathode, output loading (Ro) cathode be connected.
The pair side all-wave active rectification switching network (20, k (k=1~n)) is another kind with the complete of synchronous rectification
Wave active rectifying circuit, it is by the first rectifier diode (DK, 1, k=1~n), the second rectifier diode (DK, 2, k=1~n),
First synchronous rectification switch pipe (SK, s1, k=1~n), the second synchronous rectification switch pipe (SK, s2, k=1~n) and auxiliary switch
(SK, a, k=1~n) and it constitutes, the first rectifier diode (DK, 1, k=1~n) cathode and the first synchronous rectification switch pipe
(SK, s1, k=1~n) drain electrode, secondary side all-wave active rectification switching network (20, k (k=1~n)) input terminal ck(k=1~
N) it is connected, the first rectifier diode (DK, 1, k=1~n) anode and the second rectifier diode (DK, 2, k=1~n) anode,
Auxiliary switch (SK, a, k=1~n) source electrode be connected, the first synchronous rectification switch pipe (SK, s1, k=1~n) source electrode and
Two synchronous rectification switch pipe (SK, s2, k=1~n) source electrode, output filter capacitor (Co) cathode, output loading (Ro) it is negative
Extremely it is connected, the second rectifier diode (DK, 2, k=1~n) cathode and the second synchronous rectification switch pipe (SK, s2, k=1~n)
It drains, the input terminal e of secondary side all-wave active rectifying circuit (20, k (k=1~n))k(k=1~n) is connected, auxiliary switch
(SK, a, k=1~n) drain electrode and secondary side all-wave active rectification switching network (20, k (k=1~n)) input terminal dk(k=1
~n), output filter capacitor (Co) anode, output loading (Ro) anode be connected.
The pair side full-wave rectification switching network (30, k (k=n+1~n+m)) can be full-wave rectification switching network, or
Full-wave rectification switching network of the person with synchronous rectification.
A kind of control strategy of all-wave active rectification type LLC resonant converter is, when input voltage is in nominal operation
When near point, secondary side auxiliary switch (SK, a, k=1~n) and it is held off, by adjusting opening for converter primary side switch network
Frequency is closed, maintains output voltage constant, converter works near resonant frequency point；When input voltage falls, pass through frequency conversion
When control is unable to maintain that output voltage, secondary side auxiliary switch (SK, a, k=1~n) and pulsewidth modulation strategy (PWM) is used, transformation
The fixed work of device is in resonant frequency point, by increasing pair side auxiliary switch (SK, a, k=1~n) duty ratio, maintain output
Voltage is invariable.
A kind of control strategy of all-wave active rectification type LLC resonant converter is, when input voltage falls, to pass through
When frequency control is unable to maintain that output voltage, increase pair side auxiliary switch (S first1, a) duty ratio, maintain output voltage
It is invariable；As auxiliary switch (S1, a) duty ratio when reaching 1, increases auxiliary switch (S2, a) duty ratio；With such
It pushes away, as auxiliary switch (SK, a, k=1~n-1) and duty ratio when reaching 1, increases auxiliary switch (SK+1, a, k=1~n-1)
Duty ratio；If the quantity m=0 of secondary side full-wave rectification switching network (30, k (k=n+1~n+m)), n-th of secondary side all-wave are active
Rectifier switch network (20, n) duty ratio is necessarily less than 1；If secondary side full-wave rectification switching network (30, k (k=n+1~n+m))
Quantity m >=1, n-th of secondary side all-wave active rectification switching network (20, N) duty ratio can achieve maximum duty cycle 1.
The essential distinction of technical solution of the present invention and existing technical solution is, draws in traditional LLC secondary side rectification circuit
Enter active switching devices, increases a new control amount.When input power power down, the fixed work of converter is in resonance frequency
Rate point, the auxiliary switch of introducing can be improved the gain of converter, the present invention occurred using pulsewidth modulation (PWM) strategy
Specific operating mode.Work as n=1, when m=0, transducer gain formula expression is such as shown in (1).
In formula, n1For transformer T1The turn ratio, D be auxiliary switch S1, aDuty ratio.
Therefore, as n >=1, m=0, the auxiliary in secondary side all-wave active rectification switching network (20, k (k=1~n)) is opened
Close pipe (SK, a, k=1~n-1) driving duty ratio be 1, auxiliary switch (SN, a) driving duty ratio reach design most
Big value DN, maxWhen, the expression formula of converter maximum gain is such as shown in (1).
In formula, nnFor transformer TnThe turn ratio.
And auxiliary switch (the S as m >=1, in secondary side all-wave active rectification switching network (20, k (k=1~n))K, a,
K=1~n) driving duty ratio when being 1, can achieve maximum voltage gain, be
In formula, nkIt (k=n+1...n+m) is transformer Tk(k=n+1...n+m) the turn ratio.
This operating mode is substantially reduced to converter work in the demand of the peak gain of variable mode, passes through optimization
Resonator parameter and transformer parameter can be obviously improved the efficiency of converter, reduce input bus capacitance size, are suitble to fall
Electricity keeps the demand of occasion.
The invention has the following beneficial effects:
(1) in Design of Transformer (Tk, k=1~n+m) magnetizing inductance when, it is only necessary to consider primary side switch pipe in normal work
Sofe Switch when operation mode realizes situation, as far as possible increase transformer (Tk, k=1~n+m) and magnetizing inductance, to reduce change
Parallel operation circulation improves transducer effciency；
(2) when the non-power down of power supply, it is controlled resonant converter best efficiency point that converter, which works near resonance point,；
(3) introducing of multiple transformers can sufficiently optimize transformer device structure, reduce transformer secondary leakage inductance, reduce and become
Depressor difficulty of processing can be suitble to low-voltage, high-current application with Lifting Transform device efficiency；
(4) when power supply power-fail, converter enters PWM operating mode, can achieve biggish gain ranging, can effectively subtract
Small input bus capacitance size improves inverter power density.
Detailed description of the invention
Attached drawing 1 is conventional half-bridge LLC resonant converter schematic diagram；
Attached drawing 2 is conventional half-bridge LLC resonant converter resonance point working waveform figure；
Attached drawing 3 is a kind of modified LLC converter principle figure of secondary side increase auxiliary winding；
Attached drawing 4 is a kind of all-wave active rectification type LLC resonant converter schematic diagram of the invention；
Attached drawing 5 is a kind of all-wave active rectification type LLC that primary side switch network (10) of the present invention uses full-bridge switching network
Controlled resonant converter schematic diagram；
Attached drawing 6 is a kind of all-wave active rectification type that primary side switch network (10) of the present invention uses symmetrical half bridge switching network
LLC controlled resonant converter schematic diagram；
Attached drawing 7 is that primary side switch network (10) of the present invention is active using a kind of all-wave of another symmetrical half bridge switching network
Rectification type LLC resonant converter schematic diagram；
Attached drawing 8 is a kind of all-wave active rectification that primary side switch network (10) of the present invention uses asymmetrical half-bridge switching network
Type LLC controlled resonant converter schematic diagram；
Attached drawing 9 is a kind of common cathode that secondary side all-wave active rectification switching network (20, k (k=1~n)) of the invention uses
All-wave active rectifying circuit；
Attached drawing 10 is a kind of common anode that secondary side all-wave active rectification switching network (20, k (k=1~n)) of the invention uses
All-wave active rectifying circuit；
Attached drawing 11 is that a kind of band that secondary side all-wave active rectification switching network (20, k (k=1~n)) of the invention uses is synchronous
The all-wave active rectifying circuit of rectification function；
Attached drawing 12 is that another band that secondary side all-wave active rectification switching network (20, k (k=1~n)) of the invention uses is same
Walk the all-wave active rectifying circuit of rectification function；
Attached drawing 13 is a kind of common cathode that secondary side full-wave rectification switching network (30, k (k=n+1~n+m)) of the invention uses
Full-wave rectifying circuit；
Attached drawing 14 is a kind of common anode that secondary side full-wave rectification switching network (30, k (k=n+1~n+m)) of the invention uses
Full-wave rectifying circuit；
Attached drawing 15 is that a kind of band that secondary side full-wave rectification switching network (30, k (k=n+1~n+m)) of the invention uses is synchronous
The full-wave rectifying circuit of rectification function；
Attached drawing 16 is that another band that secondary side full-wave rectification switching network (30, k (k=n+1~n+m)) of the invention uses is same
Walk the full-wave rectifying circuit of rectification function；
Attached drawing 17 is that primary side switch network (10) primary side of the present invention is active using asymmetrical half-bridge switching network, secondary side all-wave
Rectifier switch network (20, k (k=1~n)) uses a kind of full-wave rectifying circuit (one and only one) of common cathode, without secondary side
A kind of all-wave active rectification type LLC resonance of full-wave rectification switching network (30, k (k=n+1~n+m)) (n=1, m=0) becomes
Parallel operation schematic diagram；
Attached drawing 18 is that a kind of all-wave active rectification type LLC resonant converter in power down keeps mode in attached drawing 17 of the present invention
Under exemplary operation waveform diagram；
Attached drawing 19 is that primary side switch network (10) primary side of the present invention is active using asymmetrical half-bridge switching network, secondary side all-wave
Rectifier switch network (20, k (k=1~n)) (is had and is only had using a kind of all-wave active rectifying circuit with synchronous rectification
One), a kind of all-wave without secondary side full-wave rectification switching network (30, k (k=n+1~n+m)) (n=1, m=0) it is active whole
Flow pattern LLC controlled resonant converter schematic diagram；
Attached drawing 20 is one of attached drawing 19 of the present invention all-wave active rectification type LLC resonant converter in power down holding mould
Exemplary operation waveform diagram under formula；
Attached drawing 21~23 is the t in attached drawing 18 of converter shown in attached drawing 170~t1、t1~t2、t2~t3、t3~t4Period
Interior each mode equivalent circuit (current direction is labeled as positive direction in figure)；
Attached drawing 24 is that converter shown in attached drawing 17 is illustrated when input supply voltage falls using the voltage gain of PWM control
Figure；
Attached drawing 25 is experimental waveform figure of the converter shown in attached drawing 17 when input supply voltage falls.
Designation in the figures above: UinFor input source；CinFor input bus capacitance；10 be primary side switch network；a,
B is two output ports of primary side switch network (10)；20, k (k=1~n) are secondary side all-wave active rectifying circuit；ck、dk、
ek(k=1~n) is three input ports of secondary side all-wave active rectifying circuit (20, k (k=1~n))；30, k (k=n+1~n
+ m) it is secondary side all-wave active rectifying circuit；ck、dk、ek(k=n+1~n+m) is secondary side rectification circuit (30, k (k=n+1~n+
M) three input ports)；LrFor resonant inductance；CrFor resonant capacitance；Tk(k=1~n+m) is transformer；Lmk(k=1~n+
It m) is transformer (Tk(k=1~n+m)) primary side magnetizing inductance；nk(k=1~n+m) is transformer (Tk(k=1~n+m))
The secondary side turn ratio of original；S1、S2、S3、S4Respectively the first, second, third, fourth switching tube of primary side；DK, 1、DK, 2、DK, 3、 DK, 4
(k=1~n) is respectively the first, second, third, fourth rectification of secondary side all-wave active rectifying circuit (20, k (k=1~n))
Diode；SK, a(k=1~n) is the auxiliary switch of secondary side all-wave active rectifying circuit (20, k (k=1~n))；SK, s1、
SK, s2(k=1~n) is respectively the first, second synchronous rectification switch of secondary side all-wave active rectifying circuit (20, k (k=1~n))
Pipe； DK, 3、DK, 4(k=n+1~n+m) is respectively the third of secondary side full-wave rectifying circuit (30, k (k=n+1~n+m)), the 4th
Rectifier diode；CoFor output filter capacitor；RoFor output loading；UoFor output voltage；IoTo export electric current；M is voltage increasing
Benefit；fnTo mark a Switching frequency；fnminFor the one change value of mark of lowermost switch frequency；fnmaxChange for the mark one of highest switching frequency
Value； iLrTo flow through resonant inductance LrElectric current；iLmk(k=1~n+m) is to flow through transformer magnetizing inductance Lmk(k=1~n+m)
Electric current；iDk, 3、iDk, 4(k=1~n+m) is to flow through secondary side all-wave active rectifying circuit diode DK, 3、DK, 4(k=1~n+m)
Electric current；uLr、uCrRespectively Lr、CrThe voltage at both ends；uGS1、uGS2、uGS3、uGS4And uGSk, a(k=1~n) is respectively to switch
Pipe S1、S2、S3、S4And SK, aThe driving voltage of (k=1~n)；uabFor (10) two, the primary side switch network electricity between port a, b
Pressure；t0~t8For the time.
Specific embodiment
Technical solution of the present invention is described in detail in conjunction with attached drawing.
As shown in Fig. 4, a kind of all-wave active rectification type LLC resonant converter is by input source (Uin), inlet highway
Capacitor (Cin), primary side switch network (10), resonant inductance (Lr), resonant capacitance (Cr), a secondary side transformer (T), n (>=1)
A secondary side full-wave rectification switching network (30, k (k=n+1 of all-wave active rectification switching network (20, k (k=1~n)), m (>=0)
~n+m)), output filter capacitor (Co) and output loading (Ro) constitute, wherein transformer (Tk, k=1~n+m) and primary side excitation electricity
Inductance value is Lm；The input both ends of the primary side switch network (10) respectively with input source (Uin) both ends be connected, primary side switch net
The output end a and resonant inductance (L of network (10)r) one end be connected, resonant inductance (Lr) other end and transformer (T1) primary side around
The Same Name of Ends of group is connected, transformer (T1) primary side winding different name end and transformer (T2) primary side winding Same Name of Ends be connected, with
This analogizes, transformer (Tk, k=1~n+m-1) primary side winding different name end and transformer (Tk+1, k=1~n+m-1) primary side around
The Same Name of Ends of group is connected, transformer (Tn+m) primary side winding different name end and resonant capacitance (Cr) one end be connected, resonant capacitance
(Cr) the other end be connected with the output end b of primary side switch network (10), transformer (Tk, k=1~n) vice-side winding it is of the same name
The input terminal c at end and secondary side all-wave active rectification switching network (20, k (k=1~n))k(k=1~n) is connected, transformer (Tk,
K=1~n) centre cap of vice-side winding and the input terminal (k of secondary side all-wave active rectifying circuit (20, k (k=1~n))
=1~n) it is connected, transformer (Tk, k=1~n) vice-side winding different name end and secondary side all-wave active rectification switching network (20,
K (k=1~n)) input terminal ek(k=1~n) is connected, transformer (Tk, k=n+1~n+m) vice-side winding Same Name of Ends and pair
The input terminal c of the whole switching network of side all-wave (30, k (k=n+1~n+m))k(k=n+1~n+m) is connected, transformer (Tk, k=n
+ 1~n+m) centre cap of vice-side winding and the input terminal d of secondary side full-wave rectifying circuit (30, k (k=n+1~n+m))k(k
=n+1~n+m) it is connected, transformer (Tk, k=n+1~n+m) vice-side winding different name end and secondary side full-wave rectification switching network
The input terminal e of (30, k (k=n+1~n+m))k(k=n+1~n+m) is connected, secondary side all-wave active rectification switching network (20, k
(k=1~n)) output both ends, secondary side full-wave rectification switching network (30, k (k=n+1~n+m)) the positive and negative both ends of output point
Other and output filter capacitor (Co) positive and negative end, output loading (Ro) both ends be connected.
As shown in attached drawing 5, attached drawing 6, attached drawing 7 or attached drawing 8, the primary side switch network (10) can be asymmetric half
Bridge switch network is also possible to symmetrical half bridge switching network, can also be full-bridge switching network.
As shown in Fig. 9, the secondary side all-wave active rectification switching network (20, k (k=1~n)) is a kind of the complete of common cathode
Wave active rectifying circuit, it is by the first rectifier diode (DK, 1, k=1~n), the second rectifier diode (DK, 2, k=1~n),
Third rectifier diode (DK, 3, k=1~n), the 4th rectification tetrode (DK, 4, k=1~n) and pair side auxiliary switch (SK, a,
K=1~n) it constitutes, the first rectifier diode (DK, 1, k=1~n) anode and third rectifier diode (DK, 3, k=1~n)
Anode, secondary side all-wave active rectification switching network (20, k (k=1~n)) input terminal ck(k=1~n) is connected, and first is whole
Flow diode (DK, 1, k=1~n) cathode and the second rectifier diode (DK, 2, k=1~n) cathode, auxiliary switch
(SK, a, k=1~n) drain electrode be connected, third rectifier diode (DK, 3, k=1~n) cathode and the 4th rectifier diode
(DK, 4, k=1~n) cathode, output filter capacitor (Co) anode, output loading (Ro) anode be connected, second rectification two
Pole pipe (DK, 2, k=1~n) anode and the 4th rectifier diode (DK, 4, k=1~n) anode, secondary side all-wave active rectification
The input terminal e of switching network (20, k (k=1~n))k(k=1~n) is connected, auxiliary switch (SK, a, k=1~n) source electrode
With the input terminal d of secondary side all-wave active rectification switching network (20, k (k=1~n))k(k=1~n), output filter capacitor (Co)
Cathode, output loading (Ro) cathode be connected.
As shown in Fig. 10, the secondary side all-wave active rectification switching network (20, k (k=1~n)) is a kind of common anode
All-wave active rectifying circuit, it is by the first rectifier diode (DK, 1, k=1~n), the second rectifier diode (DK, 2, k=1~
N), third rectifier diode (DK, 3, k=1~n), the 4th rectification tetrode (DK, 4, k=1~n) and secondary side auxiliary switch
(SK, a, k=1~n) and it constitutes, the first rectifier diode (DK, 1, k=1~n) cathode and third rectifier diode (DK, 3, k=1
~n) cathode, secondary side all-wave active rectification switching network (20, k (k=1~n)) input terminal ck(k=1~n) is connected, the
One rectifier diode (DK, 1, k=1~n) anode and the second rectifier diode (DK, 2, k=1~n) anode, auxiliary switch
Manage (SK, a, k=1~n) source electrode be connected, third rectifier diode (DK, 3, k=1~n) anode and the 4th rectifier diode
(DK, 4, k=1~n) anode, output filter capacitor (Co) cathode, output loading (Ro) cathode be connected, second rectification two
Pole pipe (DK, 2, k=1~n) cathode and the 4th rectifier diode (DK, 4, k=1~n) cathode, secondary side all-wave active rectification
The input terminal e of switching network (20, k (k=1~n))k(k=1~n) is connected, auxiliary switch (SK, a, k=1~n) drain electrode
With the input terminal d of secondary side all-wave active rectification switching network (20, k (k=1~n))k(k=1~n), output filter capacitor (Co)
Anode, output loading (Ro) anode be connected.
As shown in Fig. 11, the secondary side all-wave active rectification switching network (20, k (k=1~n)) is synchronous for a kind of band
The all-wave active rectifying circuit of rectification function, it is by the first rectifier diode (DK, 1, k=1~n), the second rectifier diode
(DK, 2, k=1~n), the first synchronous rectification switch pipe (SK, s1, k=1~n), the second synchronous rectification switch pipe (SK, s2, k=1~
And auxiliary switch (S n)K, a, k=1~n) and it constitutes, the first rectifier diode (DK, 1, k=1~n) anode and first synchronous
Rectifier switch pipe (SK, s1, k=1~n) source electrode, secondary side all-wave active rectification switching network (20, k (k=1~n)) input
Hold ck(k=1~n) is connected, the first rectifier diode (DK, 1, k=1~n) cathode and the second rectifier diode (DK, 2, k=1
~n) cathode, auxiliary switch (SK, a, k=1~n) drain electrode be connected, the first synchronous rectification switch pipe (SK, s1, k=1~
N) drain electrode and the second synchronous rectification switch pipe (SK, s2, k=1~n) drain electrode, output filter capacitor (Co) anode, output
Load (Ro) anode be connected, the second rectifier diode (DK, 2, k=1~n) anode and the second synchronous rectification switch pipe
(SK, s2, k=1~n) source electrode, secondary side all-wave active rectifying circuit (20, k (k=1~n)) input terminal ek(k=1~n) phase
Even, auxiliary switch (SK, a, k=1~n) source electrode and secondary side all-wave active rectification switching network (20, k (k=1~n))
Input terminal dk(k=1~n), output filter capacitor (Co) cathode, output loading (Ro) cathode be connected.
As shown in Fig. 12, the secondary side all-wave active rectification switching network (20, k (k=1~n)) is that another band is same
The all-wave active rectifying circuit of rectification function is walked, it is by the first rectifier diode (DK, 1, k=1~n), the second rectifier diode
(DK, 2, k=1~n), the first synchronous rectification switch pipe (SK, s1, k=1~n), the second synchronous rectification switch pipe (SK, s2, k=1~
And auxiliary switch (S n)K, a, k=1~n) and it constitutes, the first rectifier diode (DK, 1, k=1~n) cathode and first synchronous
Rectifier switch pipe (SK, s1, k=1~n) drain electrode, secondary side all-wave active rectification switching network (20, k (k=1~n)) input
Hold ck(k=1~n) is connected, the first rectifier diode (DK, 1, k=1~n) anode and the second rectifier diode (DK, 2, k=1
~n) anode, auxiliary switch (SK, a, k=1~n) source electrode be connected, the first synchronous rectification switch pipe (SK, s1, k=1~
N) source electrode and the second synchronous rectification switch pipe (SK, s2, k=1~n) source electrode, output filter capacitor (Co) cathode, output
Load (Ro) cathode be connected, the second rectifier diode (DK, 2, k=1~n) cathode and the second synchronous rectification switch pipe
(SK, s2, k=1~n) drain electrode, secondary side all-wave active rectifying circuit (20, k (k=1~n)) input terminal ek(k=1~n) phase
Even, auxiliary switch (SK, a, k=1~n) drain electrode and secondary side all-wave active rectification switching network (20, k (k=1~n))
Input terminal dk(k=1~n), output filter capacitor (Co) anode, output loading (Ro) anode be connected.
As shown in attached drawing 13, attached drawing 14, attached drawing 15 or attached drawing 16, the pair side full-wave rectification switching network (30, k
(k=n+1~n+m)) it can be full-wave rectification switching network, or the full-wave rectification switching network with synchronous rectification.
A kind of control strategy of all-wave active rectification type LLC resonant converter is, when input voltage is in nominal operation
When near point, secondary side auxiliary switch (SK, a, k=1~n) and it remains turned-off, by adjusting opening for converter primary side switch network
Frequency is closed, maintains output voltage constant, converter works near resonant frequency point.
A kind of control strategy of all-wave active rectification type LLC resonant converter is, when input voltage falls, to pass through
When frequency control is unable to maintain that output voltage, secondary side auxiliary switch (SK, a, k=1~n) and pulsewidth modulation strategy (PWM) is used,
The fixed work of converter is in resonant frequency point, by increasing pair side auxiliary switch (SK, a, k=1~n) duty ratio, maintain
Output voltage is invariable.Increase pair side auxiliary switch (S first1, a) duty ratio, maintain output voltage it is invariable；When
Auxiliary switch (S1, a) duty ratio when reaching 1, increases auxiliary switch (S2, a) duty ratio；And so on, work as auxiliary switch
Manage (SK, a, k=1~n-1) and duty ratio when reaching 1, increases auxiliary switch (SK+1, a, k=1~n-1) duty ratio；If secondary side
The quantity m=0 of full-wave rectification switching network (30, k (k=n+1~n+m)), n-th of secondary side all-wave active rectification switching network
(20, n) duty ratio is necessarily less than 1；If quantity m >=1 of secondary side full-wave rectification switching network (30, k (k=n+1~n+m)), the
N secondary side all-wave active rectification switching network (20, n) duty ratio can achieve maximum duty cycle 1.
The purpose of the present invention is keeping occasion to realize the isolated DC transformation of high efficiency, high power density for power down, it is
Realize that the purpose, the present invention widen the input voltage range of converter by the way of all-wave active rectifying circuit.The present invention
Auxiliary active switch pipe is introduced in the full-wave rectifying circuit of traditional LLC pair side, and work is fixed under power down holding mode in resonance frequency
Rate point, using pulsewidth modulation, there is specific operating mode of the invention, the voltage gain as shown in formula (1) in converter.
This operating mode is substantially reduced to converter work in the demand of the peak gain of variable mode, passes through optimal cavity
Parameter can be obviously improved the efficiency of converter, reduce input bus capacitance size, meet the needs of power down keeps occasion.
It is complete using asymmetrical half-bridge switching network, secondary side with primary side switch network (10) primary side shown in attached drawing 17 below
Wave active rectification switching network (20,1) uses a kind of full-wave rectifying circuit of common cathode, without secondary side full-wave rectification switching network
Illustrate that work of the invention is former for a kind of all-wave active rectification type LLC resonant converter of (30, k) (n=1, m=0)
Reason.When input voltage is near normal rating point, secondary side auxiliary switch (S1, a) remain turned-off, converter is using routine
Frequency control, working principle and characteristic are identical as traditional LLC, and work wave is as shown in Fig. 2, are no longer described in detail herein.
Attached drawing 18 gives exemplary operation waveform of the present invention in input power power down.In attached drawing 18, the converter
Primary side first switch tube (S1) driving uGS1With second switch (S2) driving uGS2For the square wave of duty ratio 50%, and complementation is led
It is logical.The square-wave voltage u of switching network (10) outputabPositive pulse amplitude is Uin, negative pulse amplitude be 0, uabPositive negative pulse stuffing is wide
Degree is all 50%.
t0Before moment, primary side second switch (S2), pair side auxiliary switch (S1, a) it is in opening state, magnetizing inductance
LM, 1It is short-circuited, resonant inductance (Lr) and resonant capacitance (Cr) resonance.Secondary side third, the 4th rectifier diode D1,3And DIsosorbide-5-NitraeAll locate
In reverse blocking state.
t0Moment, primary side second switch (S2) shutdown, resonance current iLrGive primary side first switch tube (S1) parasitic capacitance puts
While electric, primary side second switch (S is given2) parasitic capacitance charging.Secondary current flows through secondary the first rectifier diode of side
(D1,1) and auxiliary switch (S1, a).Due to transformer (T1) secondary voltage be 0, excitation current iLmIt remains unchanged.Resonance
Inductance (Lr) and resonant capacitance (Cr) resonance, output filter capacitor (Co) individually to output loading (Ro) power supply, t0~t1Period
Interior mode equivalent circuit is as shown in Fig. 21.
t1Moment, primary side first switch tube (S1) open-minded, secondary side auxiliary switch (Sa) be held on, secondary side third, the 4th
Rectifier diode D1,3And DIsosorbide-5-NitraeStill in reverse blocking state.Resonant inductance (Lr) continue and resonant capacitance (Cr) resonance, resonance
Electric current iLrIt rises rapidly, from input source (Uin) energy is sucked, secondary current flows through secondary the first, second rectifier diode of side D1,1、
D1,2And auxiliary switch (S1, a).Due to transformer (T1) secondary voltage be 0, excitation current imIt remains unchanged.Output filter
Wave capacitor (Co) to output loading (Ro) power supply, until t2Moment auxiliary switch (S1, a) shutdown.t1~t2Mould in period
State equivalent circuit is as shown in Fig. 22.
t2Moment, secondary side auxiliary switch (S1, a) shutdown, secondary side third rectifier diode D1,3Conducting, transformer are exported
Voltage (Uo) clamp, electric current iLmLinear rise.In the mode, resonant inductance (Lr) and resonant capacitance (Cr) resonance, with input source
(Uin) jointly to load (Ro) energy is provided.t2~t3Mode equivalent circuit in period is as shown in Fig. 23.
t3Moment, secondary side auxiliary switch (S1, a) open-minded, secondary side third, the 4th rectifier diode D1,3And DIsosorbide-5-NitraeIt is reversed to cut
Only, primary side first switch tube (S1) be held on.Resonant inductance (Lr) continue and resonant capacitance (Cr) resonance, from input source (Uin)
Energy is sucked, secondary current flows through secondary the first, second rectifier diode of side D1,1、D1,2And auxiliary switch (S1, a).Transformation
Device (T1) secondary voltage be 0, excitation current iLmIt remains unchanged.Output filter capacitor (Co) to output loading (Ro) power supply.t3
~t4The course of work and t in period1~t2Period is identical, and mode equivalent circuit is as shown in Fig. 22.
t4Moment, primary side first switch tube (S1) turn off, lower half of switch periods start, and the course of work is similar, is not repeated
Narration.
In the whole work process of attached drawing 18, resonant capacitance (Cr) DC offset voltage be input power (Uin) one
Half Uin/2.Assuming that magnetizing inductance (Lm) infinitely great, excitation current is constantly equal to 0, derives converter at this time using temporal analysis
Voltage gain, as shown in formula (1).
Transformer (T1) after secondary side introduces active rectification, the voltage gain range of converter shown in attached drawing 17 has obtained obviously
Extension can achieve wider working range as shown in Fig. 24.Compared with the converter in existing literature, 17 institute of attached drawing
Show the transformer (T of converter1) work is in symmetry status, there is no bias, transformer device structure is also simpler.
As shown in Fig. 25, enter the work that power down keeps mode when input voltage falls for converter shown in attached drawing 17
Waveform can effectively widen transformation after as can be seen from the figure converter shown in attached drawing 17 introduces active rectification on secondary side
Device input voltage working range, and it is consistent with the course of work of theory analysis.
A kind of all-wave active rectification type LLC resonant converter course of work using synchronous rectification as shown in Fig. 19 with
Converter shown in attached drawing 17 is similar, distinguishes the third being only that in attached drawing 17, the 4th rectifier diode D1,3、DIsosorbide-5-NitraeIt is substituted for
The first, second synchronous rectification switch pipe S in attached drawing 191, s1、S1, s2, converter work, can be into one in synchronous rectification mode
Step improves transducer effciency, and work wave is as shown in Fig. 20, is not repeating herein.
According to the description of above-described embodiment it is found that compared with the converter in existing literature, transformer work of the invention
In symmetry status, bias is not present, and structure is simple；Can meet simultaneously power-supply system to steady operation point efficiency and temporarily
State Voltage Drop maintains two kinds of demands, and overcoming traditional frequency conversion control LLC resonant converter cannot be considered in terms of stable state efficiency and transient state
The defect of voltage regulation capability is particularly suitable for server power supply, rail traffic power supply etc. and power-supply system is required to have power down holding
The application of maintenance ability.
Above content is only illustrations made for the present invention described in this specification.Technology belonging to the present invention
The technical staff in field can do various modifications or supplement or is substituted in a similar manner to described specific embodiment,
Content without departing from description of the invention or beyond the scope defined by this claim, should belong to the present invention
Protection scope.
Claims (9)
1. a kind of all-wave active rectification type LLC resonant converter and its control strategy, it is characterised in that:
A kind of all-wave active rectification type LLC resonant converter is by input source (Uin), input bus capacitance (Cin), primary side switch
Network (10), resonant inductance (Lr), resonant capacitance (Cr), a secondary side all-wave active rectification switching network of transformer (T), n (>=1)
A secondary side full-wave rectification switching network (30, k (k=n+1~n+m)) of (20, k (k=1~n)), m (>=0), output filter capacitor
(Co) and output loading (Ro) constitute, wherein transformer (Tk, k=1~n+m) primary side magnetizing inductance value be Lm；The primary side switch
The input both ends of network (10) respectively with input source (Uin) both ends be connected, the output end a and resonance of primary side switch network (10)
Inductance (Lr) one end be connected, resonant inductance (Lr) other end and transformer (T1) primary side winding Same Name of Ends be connected, transformer
(T1) primary side winding different name end and transformer (T2) primary side winding Same Name of Ends be connected, and so on, transformer (Tk, k=1~
N+m-1) the different name end of primary side winding and transformer (Tk+1, k=1~n+m-1) primary side winding Same Name of Ends be connected, transformer
(Tn+m) primary side winding different name end and resonant capacitance (Cr) one end be connected, resonant capacitance (Cr) the other end and primary side switch net
The output end b of network (10) is connected, transformer (Tk, k=1~n) vice-side winding Same Name of Ends and secondary side all-wave active rectification switch
The input terminal c of network (20, k (k=1~n))k(k=1~n) is connected, transformer (Tk, k=1~n) vice-side winding center take out
The input terminal d of head and secondary side all-wave active rectifying circuit (20, k (k=1~n))k(k=1~n) is connected, transformer (Tk, k=1
~n) the different name end of vice-side winding and the input terminal e of secondary side all-wave active rectification switching network (20, k (k=1~n))k(k=1
~n) it is connected, transformer (Tk, k=n+1~n+m) vice-side winding Same Name of Ends and the secondary whole switching network of side all-wave (30, k (k=n
+ 1~n+m)) input terminal ck(k=n+1~n+m) is connected, transformer (Tk, k=n+1~n+m) vice-side winding centre cap
With the input terminal d of secondary side full-wave rectifying circuit (30, k (k=n+1~n+m))k(k=n+1~n+m) is connected, transformer (Tk, k=
N+1~n+m) the different name end of vice-side winding and the input terminal e of secondary side full-wave rectification switching network (30, k (k=n+1~n+m))k
(k=n+1~n+m) is connected, the output both ends of secondary side all-wave active rectification switching network (20, k (k=1~n)), secondary side all-wave
The positive and negative both ends of output of rectifier switch network (30, k (k=n+1~n+m)) respectively with output filter capacitor (Co) positive and negative anodes two
End, output loading (Ro) both ends be connected.
2. a kind of all-wave active rectification type LLC resonant converter according to claim 1 and its control strategy, feature
Be: the primary side switch network (10) can be asymmetrical half-bridge switching network, be also possible to symmetrical half bridge switching network, also
It can be full-bridge switching network.
3. a kind of all-wave active rectification type LLC resonant converter according to claim 1 and its control strategy, feature
Be: the pair side all-wave active rectification switching network (20, k (k=1~n)) is a kind of all-wave active rectifying circuit of common cathode,
It is by the first rectifier diode (DK, 1, k=1~n), the second rectifier diode (DK, 2, k=1~n), third rectifier diode
(DK, 3, k=1~n), the 4th rectification tetrode (DK, 4, k=1~n) and pair side auxiliary switch (SK, a, k=1~n) and it constitutes, the
One rectifier diode (DK, 1, k=1~n) anode and third rectifier diode (DK, 3, k=1~n) anode, secondary side all-wave has
The input terminal c of source rectifier switch network (20, k (k=1~n))k(k=1~n) is connected, the first rectifier diode (DK, 1, k=1
~n) cathode and the second rectifier diode (DK, 2, k=1~n) cathode, auxiliary switch (SK, a, k=1~n) drain electrode phase
Even, third rectifier diode (DK, 3, k=1~n) cathode and the 4th rectifier diode (DK, 4, k=1~n) cathode, output
Filter capacitor (Co) anode, output loading (Ro) anode be connected, the second rectifier diode (DK, 2, k=1~n) anode and
4th rectifier diode (DK, 4, k=1~n) anode, secondary side all-wave active rectification switching network (20, k (k=1~n)) it is defeated
Enter to hold ek(k=1~n) is connected, auxiliary switch (SK, a, k=1~n) source electrode and secondary side all-wave active rectification switching network
The input terminal d of (20, k (k=1~n))k(k=1~n), output filter capacitor (Co) cathode, output loading (Ro) cathode phase
Even.
4. a kind of all-wave active rectification type LLC resonant converter according to claim 1 and its control strategy, feature
Be: the pair side all-wave active rectification switching network (20, k (k=1~n)) is a kind of all-wave active rectifying circuit of common anode,
It is by the first rectifier diode (DK, 1, k=1~n), the second rectifier diode (DK, 2, k=1~n), third rectifier diode
(DK, 3, k=1~n), the 4th rectification tetrode (DK, 4, k=1~n) and pair side auxiliary switch (SK, a, k=1~n) and it constitutes, the
One rectifier diode (DK, 1, k=1~n) cathode and third rectifier diode (DK, 3, k=1~n) cathode, secondary side all-wave has
The input terminal c of source rectifier switch network (20, k (k=1~n))k(k=1~n) is connected, the first rectifier diode (DK, 1, k=1
~n) anode and the second rectifier diode (DK, 2, k=1~n) anode, auxiliary switch (SK, a, k=1~n) source electrode phase
Even, third rectifier diode (DK, 3, k=1~n) anode and the 4th rectifier diode (DK, 4, k=1~n) anode, output
Filter capacitor (Co) cathode, output loading (Ro) cathode be connected, the second rectifier diode (DK, 2, k=1~n) cathode and
4th rectifier diode (DK, 4, k=1~n) cathode, secondary side all-wave active rectification switching network (20, k (k=1~n)) it is defeated
Enter to hold ek(k=1~n) is connected, auxiliary switch (SK, a, k=1~n) drain electrode and secondary side all-wave active rectification switching network
The input terminal d of (20, k (k=1~n))k(k=1~n), output filter capacitor (Co) anode, output loading (Ro) positive phase
Even.
5. a kind of all-wave active rectification type LLC resonant converter according to claim 1 and its control strategy, feature
Be: the pair side all-wave active rectification switching network (20, k (k=1~n)) is that a kind of all-wave with synchronous rectification has
Source rectification circuit, it is by the first rectifier diode (DK, 1, k=1~n), the second rectifier diode (DK, 2, k=1~n), it is first same
Walk rectifier switch pipe (SK, s1, k=1~n), the second synchronous rectification switch pipe (SK, s2, k=1~n) and auxiliary switch (SK, a, k
=1~n) it constitutes, the first rectifier diode (DK, 1, k=1~n) anode and the first synchronous rectification switch pipe (SK, s1, k=1~
N) the input terminal c of source electrode, secondary side all-wave active rectification switching network (20, k (k=1~n))k(k=1~n) is connected, and first
Rectifier diode (DK, 1, k=1~n) cathode and the second rectifier diode (DK, 2, k=1~n) cathode, auxiliary switch
(SK, a, k=1~n) drain electrode be connected, the first synchronous rectification switch pipe (SK, s1, k=1~n) drain electrode and the second synchronous rectification
Switching tube (SK, s2, k=1~n) drain electrode, output filter capacitor (Co) anode, output loading (Ro) anode be connected, second
Rectifier diode (DK, 2, k=1~n) anode and the second synchronous rectification switch pipe (SK, s2, k=1~n) source electrode, secondary side it is complete
The input terminal e of wave active rectifying circuit (20, k (k=1~n))k(k=1~n) is connected, auxiliary switch (SK, a, k=1~n)
Source electrode and secondary side all-wave active rectification switching network (20, k (k=1~n)) input terminal dk(k=1~n), output filtered electrical
Hold (Co) cathode, output loading (Ro) cathode be connected.
6. a kind of all-wave active rectification type LLC resonant converter according to claim 1 and its control strategy, feature
Be: the pair side all-wave active rectification switching network (20, k (k=1~n)) is another all-wave with synchronous rectification
Active rectifying circuit, it is by the first rectifier diode (DK, 1, k=1~n), the second rectifier diode (DK, 2, k=1~n), first
Synchronous rectification switch pipe (SK, s1, k=1~n), the second synchronous rectification switch pipe (SK, s2, k=1~n) and auxiliary switch (SK, a,
K=1~n) it constitutes, the first rectifier diode (DK, 1, k=1~n) cathode and the first synchronous rectification switch pipe (SK, s1, k=1
~n) drain electrode, secondary side all-wave active rectification switching network (20, k (k=1~n)) input terminal ck(k=1~n) is connected, the
One rectifier diode (DK, 1, k=1~n) anode and the second rectifier diode (DK, 2, k=1~n) anode, auxiliary switch
(SK, a, k=1~n) source electrode be connected, the first synchronous rectification switch pipe (SK, s1, k=1~n) source electrode and the second synchronous rectification
Switching tube (SK, s2, k=1~n) source electrode, output filter capacitor (Co) cathode, output loading (Ro) cathode be connected, second
Rectifier diode (DK, 2, k=1~n) cathode and the second synchronous rectification switch pipe (SK, s2, k=1~n) drain electrode, secondary side it is complete
The input terminal e of wave active rectifying circuit (20, k (k=1~n))k(k=1~n) is connected, auxiliary switch (SK, a, k=1~n)
Drain electrode and secondary side all-wave active rectification switching network (20, k (k=1~n)) input terminal dk(k=1~n), output filtered electrical
Hold (Co) anode, output loading (Ro) anode be connected.
7. a kind of all-wave active rectification type LLC resonant converter according to claim 1 and its control strategy, feature
Be: the pair side full-wave rectification switching network (30, k (k=n+1~n+m)) can be full-wave rectification switching network or band
The full-wave rectification switching network of synchronous rectification.
8. a kind of all-wave active rectification type LLC resonant converter and its control strategy, it is characterised in that:
A kind of control strategy of all-wave active rectification type LLC resonant converter is, when input voltage is attached in rated operation point
When close, secondary side auxiliary switch (SK, a, k=1~n) and it is held off, by the switch frequency for adjusting converter primary side switch network
Rate maintains output voltage constant, and converter works near resonant frequency point；When input voltage falls, pass through frequency control
When being unable to maintain that output voltage, secondary side auxiliary switch (SK, a, k=1~n) and pulsewidth modulation strategy (PWM) is used, converter is solid
Fixed work is in resonant frequency point, by increasing pair side auxiliary switch (SK, a, k=1~n) duty ratio, maintain output voltage permanent
It is fixed constant.
9. a kind of all-wave active rectification type LLC resonant converter according to claim 10 and its control strategy, special
Sign is: a kind of control strategy of all-wave active rectification type LLC resonant converter is, when input voltage falls, to pass through
When frequency control is unable to maintain that output voltage, increase pair side auxiliary switch (S first1, a) duty ratio, maintain output voltage permanent
It is fixed constant；As auxiliary switch (S1, a) duty ratio when reaching 1, increases auxiliary switch (S2, a) duty ratio；And so on, when
Auxiliary switch (SK, a, k=1~n-1) and duty ratio when reaching 1, increases auxiliary switch (SK+1, a, k=1~n-1) duty
Than；If the quantity m=0 of secondary side full-wave rectification switching network (30, k (k=n+1~n+m)), n-th of secondary side all-wave active rectification
Switching network (20, n) duty ratio is necessarily less than 1；If the quantity of secondary side full-wave rectification switching network (30, k (k=n+1~n+m))
M >=1, n-th of secondary side all-wave active rectification switching network (20, n) duty ratio can achieve maximum duty cycle 1.
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