CN104009645B - A kind of series and parallel combined dual output LLC resonant converter - Google Patents
A kind of series and parallel combined dual output LLC resonant converter Download PDFInfo
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- CN104009645B CN104009645B CN201410269620.5A CN201410269620A CN104009645B CN 104009645 B CN104009645 B CN 104009645B CN 201410269620 A CN201410269620 A CN 201410269620A CN 104009645 B CN104009645 B CN 104009645B
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Abstract
The invention discloses a kind of series and parallel combined dual output LLC resonant converter, belong to converters technical field.Described one series and parallel combined dual output LLC resonant converter is made up of input source, former limit input filter capacitor, former limit LLC resonance circuit, transformer, secondary side rectification circuit, the first and second output filter capacitors, the first and second output loadings.The present invention uses the series and parallel combined structure of input and output, can effectively reduce switch tube voltage, current stress, and Partial Power and need not move through converter process and directly export, therefore, it is possible to be effectively improved transducer effciency；The present invention, without increasing transformer output winding and power device quantity, i.e. achieves the output of two-way voltage；The present invention is that high efficiency, high power density, low cost multiple-channel output direct current power conversion provide key technology solution.
Description
Technical field
The present invention relates to a kind of dual output LLC resonant converter, belong to converters technical field, especially belong to multichannel
Output DC-DC transformation of electrical energy technical field.
Background technology
In the application of the technical fields such as Aeronautics and Astronautics, automobile, medical treatment, computer, communication system, different negative in order to meet
Carry the demand of supply voltage, it is often necessary to use dual output power supply.How to reduce the quantity of power device used by converter, reduction
Cost, raising transducer effciency and power density are always the Important Problems that this technical field is paid close attention to.
When input voltage does not require isolation far above output voltage and input and output, using Buck converter is the most directly to solve
Scheme, but the switching device of Buck converter to need to bear input voltage and output electric current, stress higher, switching tube hard switching,
Switching loss is relatively big, and input and output voltage differ greatly also result in the effective duty cycle of Buck converter reduce, dynamic property
It is deteriorated.Additionally, use single Buck converter to be difficulty with multiple-channel output.
Utilize Sofe Switch isolated converter can also realize non-isolated power conversion, for example with LLC resonant converter, it is possible to real
The Sofe Switch of the most all switching tubes, has the advantages such as high efficiency, high power density, high reliability, low cost, and can compare
Readily realize multiple-channel output.Traditional dual output LLC converter increases output way by increasing transformer coupled winding,
As it is shown in figure 1, the way of output is the most, the quantity of required Transformer Winding quantity and rectifier switch device is the most.This can make
Obtaining power device used by converter the most, cost is of a relatively high.Moreover, it is required for through LLC due to all of power
Converter processes, and is unfavorable for the further raising of efficiency.
Summary of the invention
It is an object of the invention to, for the deficiencies in the prior art, provide a kind of series and parallel combined double for dual output power conversion occasion
Output LLC resonant converter.
It is an object of the invention to be achieved through the following technical solutions:
Described one series and parallel combined dual output LLC resonant converter is by input source (Uin), former limit input filter capacitor (C1)、
Former limit LLC resonance circuit (10), transformer (T), secondary side rectification circuit (20), the first output filter capacitor (Co1), second output
Filter capacitor (Co2), the first output loading (Ro1) and the second output loading (Ro2) constitute, its limit, Central Plains LLC resonance circuit (10) by
Former limit the first switching tube (SP1), former limit second switch pipe (SP2), former limit the 3rd switching tube (SP3), former limit the 4th switching tube (SP4),
One resonant inductance (Lr), the second resonant inductance (Lm) and resonant capacitance (Cr) composition, transformer (T) comprises a primary side winding (NP) and
Two vice-side winding (NS1、NS2), secondary side rectification circuit (20) is by secondary the first switching tube (SS1), secondary second switch pipe (SS2)、
Secondary the 3rd switching tube (SS3) and secondary the 4th switching tube (SS4) composition；The former limit first of described former limit LLC resonance circuit (10) is opened
Close pipe (SP1) drain electrode be connected in former limit the 3rd switching tube (SP3) drain electrode, former limit input filter capacitor (C1) one end and input source (Uin)
Anode, former limit the first switching tube (SP1) source electrode be connected in former limit second switch pipe (SP2) drain electrode and the first resonant inductance (Lr) one
End, the first resonant inductance (Lr) the other end be connected in one end of resonant capacitance (Cr), it is humorous that the other end of resonant capacitance (Cr) is connected in second
Shake inductance (Lm) one end and transformer (T) primary side winding (NP) one end, the second resonant inductance (Lm) the other end be connected in transformer (T)
Primary side winding (NP) the other end, former limit the 3rd switching tube (SP3) source electrode and former limit the 4th switching tube (SP4) drain electrode, former limit the 4th
Switching tube (SP4) source electrode be connected in former limit second switch pipe (SP2) source electrode, former limit input filter capacitor (C1) the other end, first defeated
Go out filter capacitor (Co1) one end, the first output loading (Ro1) one end, secondary the first switching tube (SS1) drain electrode and secondary second
Switching tube (SS2) drain electrode；Described secondary the first switching tube (SS1) source electrode be connected in secondary second switch pipe (SS2) drain electrode and transformer
(T) the first vice-side winding (NS1) Same Name of Ends, transformer (T) the first vice-side winding (NS1) non-same polarity be connected in transformer (T) second
Vice-side winding (NS2) Same Name of Ends, the second output filter capacitor (Co2) one end and the second output loading (Ro2) one end, transformer
(T) the second vice-side winding (NS2) non-same polarity be connected in secondary the 3rd switching tube (SS3) source electrode and secondary the 4th switching tube (SS4) leakage
Pole, secondary the 4th switching tube (SS4) source electrode be connected in secondary second switch pipe (SS2) source electrode, the first output filter capacitor (Co1)
The other end, the second output filter capacitor (Co2) the other end, the first output loading (Ro1) the other end, the second output loading (Ro2)
The other end and input source (Uin) negative terminal.
Described one series and parallel combined dual output LLC resonant converter is by input source (Uin), former limit input filter capacitor (C1)、
Former limit LLC resonance circuit (10), transformer (T), secondary side rectification circuit (20), the first output filter capacitor (Co1), second output
Filter capacitor (Co2), the first output loading (Ro1) and the second output loading (Ro2) constitute, its limit, Central Plains LLC resonance circuit (10) by
Former limit the first switching tube (SP1), former limit second switch pipe (SP2), former limit the 3rd switching tube (SP3), former limit the 4th switching tube (SP4),
One resonant inductance (Lr), the second resonant inductance (Lm) and resonant capacitance (Cr) composition, transformer (T) comprises a primary side winding (NP) and
Two vice-side winding (NS1、NS2), secondary side rectification circuit (20) is by secondary the first diode (DS1), secondary the second diode (DS2)、
Secondary the 3rd diode (DS3) and secondary the 4th diode (DS4) composition；The former limit first of described former limit LLC resonance circuit (10) is opened
Close pipe (SP1) drain electrode be connected in former limit the 3rd switching tube (SP3) drain electrode, former limit input filter capacitor (C1) one end and input source (Uin)
Anode, former limit the first switching tube (SP1) source electrode be connected in former limit second switch pipe (SP2) drain electrode and the first resonant inductance (Lr) one
End, the first resonant inductance (Lr) the other end be connected in one end of resonant capacitance (Cr), it is humorous that the other end of resonant capacitance (Cr) is connected in second
Shake inductance (Lm) one end and transformer (T) primary side winding (NP) one end, the second resonant inductance (Lm) the other end be connected in transformer (T)
Primary side winding (NP) the other end, former limit the 3rd switching tube (SP3) source electrode and former limit the 4th switching tube (SP4) drain electrode, former limit the 4th
Switching tube (SP4) source electrode be connected in former limit second switch pipe (SP2) source electrode, former limit input filter capacitor (C1) the other end, first defeated
Go out filter capacitor (Co1) one end, the first output loading (Ro1) one end, secondary the first diode (DS1) drain electrode and secondary second
Diode (DS2) drain electrode；Described secondary the first diode (DS1) source electrode be connected in secondary the second diode (DS2) drain electrode and transformation
Device (T) the first vice-side winding (NS1) Same Name of Ends, transformer (T) the first vice-side winding (NS1) non-same polarity be connected in transformer (T)
Two vice-side winding (NS2) Same Name of Ends, the second output filter capacitor (Co2) one end and the second output loading (Ro2) one end, transformation
Device (T) the second vice-side winding (NS2) non-same polarity be connected in secondary the 3rd diode (DS3) source electrode and secondary the 4th diode (DS4)
Drain electrode, secondary the 4th diode (DS4) source electrode be connected in secondary the second diode (DS2) source electrode, the first output filter capacitor (Co1)
The other end, the second output filter capacitor (Co2) the other end, the first output loading (Ro1) the other end, the second output loading (Ro2)
The other end and input source (Uin) negative terminal.
Technical solution of the present invention essential difference is in that with existing technical scheme, do not increase LLC converter transformer export around
In the case of group and power device, construct the second tunnel by pulling out secondary centre cap from transformer secondary bridge rectifier structure
Output.The present invention uses the quasi-parallel way of input and output to improve the efficiency of converter further.The present invention can substantially reduce former limit
LLC resonance circuit breaker in middle tube voltage stress, minimizing power device quantity, raising transducer effciency and power density.
There is advantages that
(1) converter secondary uses the mode of centre cap bridge rectifier, it is possible to achieve doubleway output；
(2) reduce converter secondary power device quantity, reduce cost；
(3) converter secondary power semiconductor can realize voltage clamp naturally, and device voltage stress is low；
(4) there is efficiency height, power density advantages of higher；
(5) mode of input and output quasi-parallel connection reduces the voltage stress of former limit LLC resonance circuit breaker in middle pipe；
(6) mode of input and output quasi-parallel connection allows input source directly provide Partial Power to output, improves power-efficient further；
Accompanying drawing explanation
Accompanying drawing 1 is traditional dual output LLC converter principle figure；
Accompanying drawing 2 is that the present invention former limit LLC resonance circuit uses full-bridge LLC circuit topology, secondary side rectification circuit to use bridge-type same
The one series and parallel combined dual output LLC resonant converter schematic diagram of step rectification；
Accompanying drawing 3 is that the present invention former limit LLC resonance circuit uses full-bridge LLC circuit topology, secondary side rectification circuit to use bridge-type two
The one series and parallel combined dual output LLC resonant converter schematic diagram of pole pipe rectification；
Accompanying drawing 4 is that the present invention former limit LLC resonance circuit uses half-bridge LLC circuit topology, secondary side rectification circuit to use bridge-type same
The one series and parallel combined dual output LLC resonant converter schematic diagram of step rectification；
Accompanying drawing 5 is that the present invention former limit LLC resonance circuit uses half-bridge LLC circuit topology, secondary side rectification circuit to use bridge-type two
The one series and parallel combined dual output LLC resonant converter schematic diagram of pole pipe rectification；
Accompanying drawing 6 is that former limit LLC resonance circuit uses full-bridge LLC circuit topology, secondary side rectification circuit to use bridge synchronization rectification
The key operation waveforms of a kind of series and parallel combined dual output LLC resonant converter；
Accompanying drawing 7～10 is that former limit LLC resonance circuit uses full-bridge LLC circuit topology, secondary side rectification circuit to use bridge type synchronous whole
A kind of series and parallel combined dual output LLC resonant converter of stream is at the equivalent circuit diagram of each switch mode；
Designation in the figures above: 10 is former limit LLC resonance circuit；20 is secondary side rectification circuit；T is transformer；
NP、NS1And NS2It is respectively the primary side winding of transformer (T), the first vice-side winding and the second vice-side winding；SP1、SP2、SP3
And SP4It is respectively former limit first, second, third and fourth switching tube；SS1、SS2、SS3And SS4Be respectively secondary first, the
Two, the third and fourth switching tube；LrIt it is the first resonant inductance；LmIt it is the second resonant inductance；CrFor resonant capacitance；C1For input
Filter capacitor；Co1And Co2It is respectively the first and second output filter capacitors；CBusFor bus capacitor；Cin1And Cin2For filtering
Electric capacity；Ro1And Ro2It is respectively the first and second output loadings；UinFor input source；Uo1And Uo2It is respectively first and second defeated
Go out voltage；UBusFor busbar voltage；DS1、DS2、DS3、DS4、DS5、DS6、DS7And DS8For commutation diode；Lo1、
Lo2For filter inductance；SS5、SS6、SS7And SS8For switching tube；iinFor input source UinSupply current；iLrFor flowing through the first resonance
Inductance (Lr) electric current, iLmFor flowing through the second resonant inductance (Lm) electric current, uCrFor resonant capacitance (Cr) voltage at two ends；iSP1、iSP2、
iSP3And iSP4It is respectively and flows into switching tube SP1、SP2、SP3And SP4Drain current；iSS1、iSS2、iSS3And iSS4It is respectively stream
Enter switching tube SS1、SS2、SS3And SS4Drain current；uGSP1、uGSP2、uGSP3And uGSP4It is respectively switching tube SP1、SP2、
SP3And SP4Driving voltage；uGSS1、uGSS2、uGSS3And uGSS4It is respectively switching tube SS1、SS2、SS3And SS4Driving electricity
Pressure；t0、t1、t2、t3And t4For the time.
Detailed description of the invention
Below in conjunction with the accompanying drawings technical scheme is described in detail.
As shown in Figure 2, described one series and parallel combined dual output LLC resonant converter is by input source (Uin), former limit input
Filter capacitor (C1), former limit LLC resonance circuit (10), transformer (T), secondary side rectification circuit (20), the first output filter capacitor (Co1)、
Second output filter capacitor (Co2), the first output loading (Ro1) and the second output loading (Ro2) constitute, its limit, Central Plains LLC resonance electricity
Road (10) is by former limit the first switching tube (SP1), former limit second switch pipe (SP2), former limit the 3rd switching tube (SP3), former limit the 4th switching tube
(SP4), the first resonant inductance (Lr), the second resonant inductance (Lm) and resonant capacitance (Cr) composition, transformer (T) comprise a former limit around
Group (NP) and two vice-side winding (NS1、NS2), secondary side rectification circuit (20) is by secondary the first switching tube (SS1), secondary second switch
Pipe (SS2), secondary the 3rd switching tube (SS3) and secondary the 4th switching tube (SS4) composition；The former limit of described former limit LLC resonance circuit (10)
First switching tube (SP1) drain electrode be connected in former limit the 3rd switching tube (SP3) drain electrode, former limit input filter capacitor (C1) one end and input
Source (Uin) anode, former limit the first switching tube (SP1) source electrode be connected in former limit second switch pipe (SP2) drain electrode and the first resonant inductance
(Lr) one end, the first resonant inductance (Lr) the other end be connected in one end of resonant capacitance (Cr), the other end of resonant capacitance (Cr) is connected in
Second resonant inductance (Lm) one end and transformer (T) primary side winding (NP) one end, the second resonant inductance (Lm) the other end be connected in change
Depressor (T) primary side winding (NP) the other end, former limit the 3rd switching tube (SP3) source electrode and former limit the 4th switching tube (SP4) drain electrode,
Former limit the 4th switching tube (SP4) source electrode be connected in former limit second switch pipe (SP2) source electrode, former limit input filter capacitor (C1) another
End, the first output filter capacitor (Co1) one end, first load (Ro1) one end, secondary the first switching tube (SS1) drain electrode and pair
Limit second switch pipe (SS2) drain electrode；Described secondary the first switching tube (SS1) source electrode be connected in secondary second switch pipe (SS2) drain electrode and
Transformer (T) the first vice-side winding (NS1) Same Name of Ends, transformer (T) the first vice-side winding (NS1) non-same polarity be connected in transformer (T)
Second vice-side winding (NS2) Same Name of Ends, the second output filter capacitor (Co2) one end and the second output loading (Ro2) one end, become
Depressor (T) the second vice-side winding (NS2) non-same polarity be connected in secondary the 3rd switching tube (SS3) source electrode and secondary the 4th switching tube (SS4)
Drain electrode, secondary the 4th switching tube (SS4) source electrode be connected in secondary second switch pipe (SS2) source electrode, the first output filter capacitor (Co1)
The other end, the second output filter capacitor (Co2) the other end, the first output loading (Ro1) the other end, the second output loading (Ro2)
The other end and input source (Uin) negative terminal.
As shown in Figure 4, described one series and parallel combined dual output LLC resonant converter is by input source (Uin), former limit input
Filter capacitor (C1), former limit LLC resonance circuit (10), transformer (T), secondary side rectification circuit (20), the first output filter capacitor (Co1)、
Second output filter capacitor (Co2), the first output loading (Ro1) and the second output loading (Ro2) constitute, its limit, Central Plains LLC resonance electricity
Road (10) is by former limit the first switching tube (SP1), former limit second switch pipe (SP2), former limit the 3rd switching tube (SP3), former limit the 4th switching tube
(SP4), the first resonant inductance (Lr), the second resonant inductance (Lm) and resonant capacitance (Cr) composition, transformer (T) comprise a former limit around
Group (NP) and two vice-side winding (NS1、NS2), secondary side rectification circuit (20) is by secondary the first diode (DS1), secondary the two or two pole
Pipe (DS2), secondary the 3rd diode (DS3) and secondary the 4th diode (DS4) composition；Described former limit LLC resonance circuit (10) former
Limit the first switching tube (SP1) drain electrode be connected in former limit the 3rd switching tube (SP3) drain electrode, former limit input filter capacitor (C1) one end and defeated
Enter source (Uin) anode, former limit the first switching tube (SP1) source electrode be connected in former limit second switch pipe (SP2) drain electrode and the first resonance electricity
Sense (Lr) one end, the first resonant inductance (Lr) the other end be connected in one end of resonant capacitance (Cr), the other end of resonant capacitance (Cr) is even
In the second resonant inductance (Lm) one end and transformer (T) primary side winding (NP) one end, the second resonant inductance (Lm) the other end be connected in
Transformer (T) primary side winding (NP) the other end, former limit the 3rd switching tube (SP3) source electrode and former limit the 4th switching tube (SP4) drain electrode,
Former limit the 4th switching tube (SP4) source electrode be connected in former limit second switch pipe (SP2) source electrode, former limit input filter capacitor (C1) another
End, the first output filter capacitor (Co1) one end, the first output loading (Ro1) one end, secondary the first diode (DS1) drain electrode
With secondary the second diode (DS2) drain electrode；Described secondary the first diode (DS1) source electrode be connected in secondary the second diode (DS2)
Drain electrode and transformer (T) the first vice-side winding (NS1) Same Name of Ends, transformer (T) the first vice-side winding (NS1) non-same polarity be connected in change
Depressor (T) the second vice-side winding (NS2) Same Name of Ends, the second output filter capacitor (Co2) one end and the second output loading (Ro2) one
End, transformer (T) the second vice-side winding (NS2) non-same polarity be connected in secondary the 3rd diode (DS3) source electrode and secondary the four or two pole
Pipe (DS4) drain electrode, secondary the 4th diode (DS4) source electrode be connected in secondary the second diode (DS2) source electrode, first output filtering
Electric capacity (Co1) the other end, the second output filter capacitor (Co2) the other end, the first output loading (Ro1) the other end, second defeated
Go out load (Ro2) the other end and input source (Uin) negative terminal.
In the present invention, the effect of described former limit LLC resonance circuit (10) is to produce Symmetrical resonance current, and is injected into
Primary side winding (N to transformer (T)PIn).In order to realize this purpose, described former limit LLC resonance circuit (10) can be full-bridge
The circuit topologies such as LLC, half-bridge LLC.The effect of described secondary side rectification circuit (20) is to two vice-side winding (N of transformer (T)S1、
NS2Symmetrical pulse current in) carries out rectification, constitutes dual output.In order to realize this purpose, described secondary side rectification circuit (20)
The rectification circuits such as bridge diode rectification, bridge synchronization rectification can be used.Accompanying drawing 2 gives former limit LLC resonance circuit and uses
Full-bridge LLC circuit topology, secondary side rectification circuit use the one series and parallel combined dual output LLC resonance of bridge synchronization rectification
Converter principle figure.Accompanying drawing 3 gives former limit LLC resonance circuit and uses full-bridge LLC circuit topology, secondary side rectification circuit to adopt
With the one of bridge diode rectification series and parallel combined dual output LLC resonant converter schematic diagram.Accompanying drawing 4 gives former limit
LLC resonance circuit use half-bridge LLC circuit topology, secondary side rectification circuit use bridge synchronization rectification one series and parallel combined
Dual output LLC resonant converter schematic diagram.Accompanying drawing 5 give former limit LLC resonance circuit use half-bridge LLC circuit topology,
Secondary side rectification circuit uses the one series and parallel combined dual output LLC resonant converter schematic diagram of bridge diode rectification.
It is an object of the invention to realize the dual output conversion of high efficiency, high power density, low cost, in order to realize this purpose, this
Invention pulls out secondary centre cap in the transformer secondary bridge rectifier structure of LLC converter and constructs the second tunnel output.This
The bright quasi-parallel way of employing input and output improves the efficiency of converter further.The present invention can substantially reduce former limit LLC resonance electricity
Road breaker in middle tube voltage stress, minimizing power device quantity, raising transducer effciency and power density.
Full-bridge LLC circuit topology, secondary side rectification circuit is used to use bridge with the former limit LLC resonance circuit shown in accompanying drawing 2 below
As a example by the one series and parallel combined dual output LLC resonant converter of formula synchronous rectification, the operation principle of the present invention is described.Accompanying drawing
6 give former limit LLC resonance circuit uses full-bridge LLC circuit topology, secondary side rectification circuit to use the one of bridge synchronization rectification
The key operation waveforms of series and parallel combined dual output LLC resonant converter.
t0Before moment, former limit the first switching tube SP1With former limit the 4th switching tube SP4Conducting, former limit full-bridge circuit applies positive voltage
By the first resonant inductance (Lr), the second resonant inductance (Lm), resonant capacitance (Cr) the resonant network two ends that are composed in series, secondary
One switching tube (SS1) and secondary the 4th switching tube (SS4) conducting, output voltage reflexes to transformer (T) primary side winding (NP) voltage at two ends
Clamp the second resonant inductance (Lm) so that it is electric current linear rise, the first resonant inductance (Lr) and resonant capacitance (Cr) resonance, first is humorous
Shake inductance (Lr) and the second resonant inductance (LmElectric current in) is negative value, and both difference between currents have been delivered to its secondary by transformer (T)
Two winding (NS1、NS2In), respectively flow through secondary the first switching tube (SS1) and secondary the 4th switching tube (SS4), former limit first switchs
Pipe SP1, former limit the 4th switching tube SP4, secondary the first switching tube (SS1) and secondary the 4th switching tube (SS4) electric current be all negative value, humorous
Shake electric capacity (Cr) voltage is negative value, resonant network is to input source (Uin) return energy, provide power, input source to two-way output loading
(Uin) by electric current iinDirectly to the first output loading (Ro1) Partial Power is provided；t0Moment, the first resonant inductance (Lr) electric current mistake
Zero, resonant capacitance (Cr) voltage reaches reversed peak, the first resonant inductance (Lr) and resonant capacitance (Cr) continue resonance, the second resonance
Inductance (Lm) continue to be output and reflex to transformer (T) primary side winding (NP) voltage clamp at two ends, electric current linear rise, input source
(Uin) providing power to resonant network and two-way output loading, this mode equivalent circuit is as shown in Figure 7.
t1Moment, former limit the first switching tube SP1With former limit the 4th switching tube SP4Conducting, conducting electric current be on the occasion of, the first resonance is electric
Sense (Lr) electric current and the second resonant inductance (Lm) electric current is equal, the first resonant inductance (Lr), the second resonant inductance (Lm) and resonant capacitance (Cr)
Three's resonance together, two winding (N of transformer (T) secondaryS1、NS2Electric current in) is zero, secondary the first switching tube (SS1) and secondary
4th switching tube (SS4) zero-current switching, transformer (T) disengages with output, input source (Uin) to resonant network provide energy, second
Output filter capacitor (Co2) independent to the second output loading (Ro2) power supply, input source (Uin) and the first output filter capacitor (Co1) one
Rise to the first output loading (Ro1) power supply, this mode equivalent circuit is as shown in Figure 8.
t2Moment, former limit the first switching tube SP1With former limit the 4th switching tube SP4Turning off, output voltage reflexes to transformer (T) former limit
Winding (NP) voltage clamp the second resonant inductance (L at two endsm) so that it is electric current linear decline, the first resonant inductance (Lr) and resonance electricity
Hold (Cr) resonance, former limit the first switching tube SP1With former limit second switch pipe SP2The change of current, former limit the 4th switching tube SP4With former limit the 3rd
Switching tube SP3The change of current, secondary second switch pipe SP2Body diode and secondary the 3rd switching tube SP3Body diode zero current turning-on,
Former limit second switch pipe SP2, former limit the 3rd switching tube SP3, secondary second switch pipe SS2With secondary the 3rd switching tube SS3Electric conduction
Stream is all negative value, and resonant network is to input source (Uin) return energy, provide power, input source (U to two-way output loadingin) pass through
Electric current iinDirectly to the first output loading (Ro1) Partial Power is provided, this mode equivalent circuit is as shown in Figure 9.
t3Moment, former limit second switch pipe SP2With former limit the 3rd switching tube SP3No-voltage is open-minded, and conducting electric current is negative value, former limit
Full-bridge circuit applies negative voltage by the first resonant inductance (Lr), the second resonant inductance (Lm), resonant capacitance (Cr) be composed in series humorous
Vibrating network two ends, secondary second switch pipe (SS2) and the 3rd switching tube (SS3) no-voltage is open-minded, output voltage reflexes to transformer (T)
Primary side winding (NP) voltage clamp the second resonant inductance (L at two endsm) so that it is electric current linear decline, the first resonant inductance (Lr) harmonious
Shake electric capacity (Cr) resonance, the first resonant inductance (Lr) and the second resonant inductance (LmElectric current in) be on the occasion of, both pass through by difference between current
Transformer (T) has been delivered to two winding (N of its secondaryS1、NS2In), respectively flow through secondary second switch pipe (SS2) and secondary the 3rd open
Close pipe (SS3), former limit second switch pipe SP2, former limit the 3rd switching tube SP3, secondary second switch pipe (SS2) and secondary the 3rd switching tube
(SS3Electric current in) is all negative value, resonant capacitance (Cr) voltage be on the occasion of, resonant network is to input source (Uin) return energy, to two-way
Output loading provides power, input source (Uin) by electric current iinDirectly to the first output loading (Ro1) Partial Power, this mode are provided
Equivalent circuit is as shown in Figure 10.
t4In the moment, lower half switch periods starts, and the course of work is similar to, and narration is not repeated.
According to the description of the above-mentioned course of work, input source (U of the present inventionin) directly can provide Partial Power to load, permissible
Realize doubleway output, it is achieved the Sofe Switch of all switching tubes.The present invention can effectively reduce power device quantity, improve power supply change
Change efficiency and power density.
Claims (2)
1. a series and parallel combined dual output LLC resonant converter, it is characterised in that:
Described one series and parallel combined dual output LLC resonant converter is by input source (Uin), former limit input filter capacitor (C1)、
Former limit LLC resonance circuit (10), transformer (T), secondary side rectification circuit (20), the first output filter capacitor (Co1), second output
Filter capacitor (Co2), the first output loading (Ro1) and the second output loading (Ro2) constitute, its limit, Central Plains LLC resonance circuit (10) by
Former limit the first switching tube (SP1), former limit second switch pipe (SP2), former limit the 3rd switching tube (SP3), former limit the 4th switching tube (SP4),
One resonant inductance (Lr), the second resonant inductance (Lm) and resonant capacitance (Cr) composition, transformer (T) comprises a primary side winding (NP) and
Two vice-side winding (NS1、NS2), secondary side rectification circuit (20) is by secondary the first switching tube (SS1), secondary second switch pipe (SS2)、
Secondary the 3rd switching tube (SS3) and secondary the 4th switching tube (SS4) composition；The former limit first of described former limit LLC resonance circuit (10) is opened
Close pipe (SP1) drain electrode be connected in former limit the 3rd switching tube (SP3) drain electrode, former limit input filter capacitor (C1) one end and input source (Uin)
Anode, former limit the first switching tube (SP1) source electrode be connected in former limit second switch pipe (SP2) drain electrode and the first resonant inductance (Lr) one
End, the first resonant inductance (Lr) the other end be connected in one end of resonant capacitance (Cr), it is humorous that the other end of resonant capacitance (Cr) is connected in second
Shake inductance (Lm) one end and transformer (T) primary side winding (NP) one end, the second resonant inductance (Lm) the other end be connected in transformer (T)
Primary side winding (NP) the other end, former limit the 3rd switching tube (SP3) source electrode and former limit the 4th switching tube (SP4) drain electrode, former limit the 4th
Switching tube (SP4) source electrode be connected in former limit second switch pipe (SP2) source electrode, former limit input filter capacitor (C1) the other end, first defeated
Go out filter capacitor (Co1) one end, the first output loading (Ro1) one end, secondary the first switching tube (SS1) drain electrode and secondary the 3rd
Switching tube (SS3) drain electrode；Described secondary the first switching tube (SS1) source electrode be connected in secondary second switch pipe (SS2) drain electrode and transformer
(T) the first vice-side winding (NS1) Same Name of Ends, transformer (T) the first vice-side winding (NS1) non-same polarity be connected in transformer (T) second
Vice-side winding (NS2) Same Name of Ends, the second output filter capacitor (Co2) one end and the second output loading (Ro2) one end, transformer
(T) the second vice-side winding (NS2) non-same polarity be connected in secondary the 3rd switching tube (SS3) source electrode and secondary the 4th switching tube (SS4) leakage
Pole, secondary the 4th switching tube (SS4) source electrode be connected in secondary second switch pipe (SS2) source electrode, the first output filter capacitor (Co1)
The other end, the second output filter capacitor (Co2) the other end, the first output loading (Ro1) the other end, the second output loading (Ro2)
The other end and input source (Uin) negative terminal.
2. a series and parallel combined dual output LLC resonant converter, it is characterised in that:
Described one series and parallel combined dual output LLC resonant converter is by input source (Uin), former limit input filter capacitor (C1)、
Former limit LLC resonance circuit (10), transformer (T), secondary side rectification circuit (20), the first output filter capacitor (Co1), second output
Filter capacitor (Co2), the first output loading (Ro1) and the second output loading (Ro2) constitute, its limit, Central Plains LLC resonance circuit (10) by
Former limit the first switching tube (SP1), former limit second switch pipe (SP2), former limit the 3rd switching tube (SP3), former limit the 4th switching tube (SP4),
One resonant inductance (Lr), the second resonant inductance (Lm) and resonant capacitance (Cr) composition, transformer (T) comprises a primary side winding (NP) and
Two vice-side winding (NS1、NS2), secondary side rectification circuit (20) is by secondary the first diode (DS1), secondary the second diode (DS2)、
Secondary the 3rd diode (DS3) and secondary the 4th diode (DS4) composition；The former limit first of described former limit LLC resonance circuit (10) is opened
Close pipe (SP1) drain electrode be connected in former limit the 3rd switching tube (SP3) drain electrode, the one end on former limit input filter capacitor (C1) and input source (Uin)
Anode, former limit the first switching tube (SP1) source electrode be connected in former limit second switch pipe (SP2) drain electrode and the first resonant inductance (Lr) one
End, the first resonant inductance (Lr) the other end be connected in one end of resonant capacitance (Cr), it is humorous that the other end of resonant capacitance (Cr) is connected in second
Shake inductance (Lm) one end and transformer (T) primary side winding (NP) one end, the second resonant inductance (Lm) the other end be connected in transformer (T)
Primary side winding (NP) the other end, former limit the 3rd switching tube (SP3) source electrode and former limit the 4th switching tube (SP4) drain electrode, former limit the 4th
Switching tube (SP4) source electrode be connected in former limit second switch pipe (SP2) source electrode, former limit input filter capacitor (C1) the other end, first defeated
Go out filter capacitor (Co1) one end, the first output loading (Ro1) one end, secondary the first diode (DS1) negative electrode and secondary the 3rd
Diode (DS3) negative electrode；Described secondary the first diode (DS1) anode be connected in secondary the second diode (DS2) negative electrode and transformation
Device (T) the first vice-side winding (NS1) Same Name of Ends, transformer (T) the first vice-side winding (NS1) non-same polarity be connected in transformer (T)
Two vice-side winding (NS2) Same Name of Ends, the second output filter capacitor (Co2) one end and the second output loading (Ro2) one end, transformation
Device (T) the second vice-side winding (NS2) non-same polarity be connected in secondary the 3rd diode (DS3) anode and secondary the 4th diode (DS4)
Negative electrode, secondary the 4th diode (DS4) anode be connected in secondary the second diode (DS2) anode, the first output filter capacitor (Co1)
The other end, the second output filter capacitor (Co2) the other end, the first output loading (Ro1) the other end, the second output loading (Ro2)
The other end and input source (Uin) negative terminal.
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| CN104935178A (en) * | 2014-12-12 | 2015-09-23 | 武汉绿鼎天舒科技发展有限公司 | Lighting device with adjustable height |
| CN104638932A (en) * | 2015-03-06 | 2015-05-20 | 南京航空航天大学 | Multi-resonant converter |
| CN108616215A (en) * | 2016-12-13 | 2018-10-02 | 深圳职业技术学院 | a kind of resonance circuit |
| CN106712541A (en) * | 2016-12-30 | 2017-05-24 | 深圳英飞源技术有限公司 | Power source converter |
| WO2020154572A1 (en) * | 2019-01-24 | 2020-07-30 | Magna International Inc. | Method and system using a noise filter to drive synchronous rectifiers of an llc dc-dc converter |
| CN111404388B (en) * | 2020-04-13 | 2022-05-03 | 剑桥大学南京科技创新中心有限公司 | Series cascade type switch transformer direct current converter and working method thereof |
| CN113839558A (en) | 2020-06-24 | 2021-12-24 | 台达电子工业股份有限公司 | Conversion device |
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| CN101572488B (en) * | 2009-06-09 | 2011-08-10 | 华中科技大学 | Dual output DC-DC converter for multiplexing bridge arm |
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