CN103944396A - LLC resonance type three-port DC-DC converter and control method thereof - Google Patents
LLC resonance type three-port DC-DC converter and control method thereof Download PDFInfo
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- CN103944396A CN103944396A CN201410145105.6A CN201410145105A CN103944396A CN 103944396 A CN103944396 A CN 103944396A CN 201410145105 A CN201410145105 A CN 201410145105A CN 103944396 A CN103944396 A CN 103944396A
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Abstract
The invention discloses an LLC resonance type three-port DC-DC converter and a control method thereof. The converter is composed of a primary side circuit, a secondary side circuit, a transformer and LLC resonant network. The primary side circuit is composed of a full-bridge unit integrating two paths of two-way buck-boost circuits connected in parallel in a staggered mode. The secondary side circuit is composed of a rectifier circuit. The transformer and LLC resonant network is composed of a high-frequency transformer, a resonant inductor Lr, an excitation inductor Lm and a resonant capacitor Cr. By adjusting the duty ratios and frequencies of power switch tubes of the primary side circuit, two-way energy transmission and output one-way energy transmission between two ports of the primary side can be effectively controlled at the same time. According to the converter and the method, a non-isolation type two-way buck-boost converter is integrated with an isolation type full-bridge LLC resonant converter, so that multiplexing of the primary side switch tubes is achieved, the number of the switch tubes is reduced, cost is reduced, and power density and reliability are improved. The converter is suitable for renewable energy source power generation, hybrid electric vehicles, fuel cell vehicles, hybrid energy storage systems and other systems.
Description
Technical field
The present invention relates to the converters field in the systems such as renewable energy power generation, hybrid-electric car, fuel cell car, relate in particular to a kind of LLC mode of resonance three port DC-DC converter and control methods thereof.
Background technology
Day by day exhaustion and the people of earth resource make renewable energy system more and more important to the extensive concern of environmental problem.At present, photovoltaic generation and wind power generation are in renewable energy power generation form, to apply more two kinds, but are subject to the impact of natural conditions, and its supply of electric power exists unstable, discontinuous shortcoming.For this reason, generally multiple renewable energy sources and other energy and energy storage device need to be combined and form regenerative resource associating electric power system, utilize the complementarity between them to obtain comparatively stable, continuous electric energy, for example photovoltaic-storage battery associating electric power system is exactly a kind of good selection, due to adding of secondary battery unit, not only the stability of system can be improved, the efficient utilization of energy can also be realized.
In order to make a plurality of input power associating powering loads, need to, with multiport converter as interface, connect generator unit, energy-storage units and load port.In traditional associating electric power system, the energy of each form all needs a DC-DC converter, the regenerative resources such as photovoltaic, fuel cell or storage battery or energy storage device are connected on common DC bus, DC bus can be powered to DC load, also can be by carrying out the exchange of energy between bidirectional DC-DC converter and energy storage device.The converter of this structure is containing more power conversion unit, complex structure; And port of every increase just increases a power converter cell, system cost is higher; And along with the increase of converter and control circuit quantity, the reliability of system reduces.
For the drawback of traditional structure, in order to simplify circuit structure, can replace original a plurality of two port DC-DC converters with three port DC-DC converters, realize the merging of converter topology and function, form novel regenerative resource distributed generation system.Three port DC-DC converters have following advantage: (1) device for power switching number and relevant auxiliary circuit are less, and cost is low, and power density is high; (2) reduce the progression of power conversion, improved the efficiency of system; (3) characteristics of compact layout, the reliability of device is enhanced; (4) be easy to realize the energy management of centralized control and optimization.In addition, three port converters allow the energy input of various ways, and the character of input source, amplitude and characteristic can be identical, also can difference very large, two input sources can power to the load individually or simultaneously, thereby the stability of system and flexibility are significantly improved.
Existing three port converters can be divided three classes, completely isolated form, part isolated form and non-isolation type.Non-isolation type three port converters are not because there is no high-frequency isolation transformer, and applications large at port voltage grade differential or that require to isolate is limited.Utilize three winding high frequency transformers, by magnetic-coupled mode, connect three input/output end ports, form the converter of complete isolated form, more conventional structure is three active bridges (triple active bridge, TAB) three port converters, it can realize three isolation between port, and can connect the energy source port of different in kind.Its major defect is that many power devices can not be multiplexing, and number of elements is more, and circuit structure is complicated.In order to reduce the quantity of switching tube, reduce system cost, some scholars propose again three port converters of part isolated form that Boost circuit and two active bridges (dual active bridge, DAB) or unidirectional phase-shifted full-bridge converter are integrated in succession.This structure had both realized sharing of circuit elements device, had simplified circuit structure, had improved power density, can realize the isolation between input energy sources and load port again simultaneously.But when converter is operated in underloading, converter is difficult for realizing the soft switch of ZVS, is unfavorable for the high-efficiency operation of converter.
Summary of the invention
In order to overcome the above-mentioned problems in the prior art, the advantage that combined circuit element is multiplexing, the object of this invention is to provide a kind of LLC mode of resonance three port DC-DC converter and control methods thereof.
In order to solve the technical problem of above-mentioned existence, the present invention is achieved by the following technical solutions:
A kind of LLC mode of resonance three port DC-DC converters, this converter is by former limit circuit, secondary circuit and transformer, to add LLC resonant network to form, described former limit circuit is that the full bridge unit by the integrated two-way buck-boost circuit of two-way crisscross parallel forms, described secondary circuit is to consist of rectification circuit, and it is by high frequency transformer, resonant inductance L that transformer adds LLC resonant network
r, magnetizing inductance L
mwith resonance capacitor C
rform; By regulating duty ratio and the frequency of former limit contactor pipe, can to the directed energy transmission of the bidirectional energy transmission between the port of two, former limit and output, control effectively simultaneously;
Described former limit circuit comprises the first I/O DC source V
s1, the second I/O DC source V
s2, the first capacitor C
s1, the second capacitor C
s2, the first inductance L
b1, the second inductance L
b2and first to fourth switching tube S
1～S
4; The first switching tube S
1, second switch pipe S
2, the 3rd switching tube S
3with the 4th switching tube S
4form full bridge unit, wherein the first switching tube S
1source electrode and second switch pipe S
2drain electrode connect, form the front brachium pontis of full bridge unit, the 3rd switching tube S
3source electrode and the 4th switching tube S
4drain electrode connect, form the rear brachium pontis of full bridge unit, former and later two brachium pontis are connected in parallel; The first DC source V
s1with the first input capacitance C
s1, full bridge unit is connected in parallel; The second DC source V
s2with the second input capacitance C
s2parallel connection, the second DC source V
s2positive pole connect the first inductance L
b1with the second inductance L
b2common port, the first inductance L
b1the other end be connected with front brachium pontis mid point, the second inductance L
b2the other end be connected with rear brachium pontis mid point;
Described secondary circuit comprises the first output rectifier diode D
o1, the second output rectifier diode D
o2, the 3rd output rectifier diode D
o3, the 4th output rectifier diode D
o4, output capacitance C
owith output resistance R
o, the first output rectifier diode D
o1anode and the second output rectifier diode D
o2negative electrode connect, the 3rd output rectifier diode D
o3anode and the 4th output rectifier diode D
o4negative electrode connect, the first output rectifier diode D
o1with the 3rd output rectifier diode D
o3common cathode connects, the second output rectifier diode D
o2with the 4th output rectifier diode D
o4be total to anodic bonding, output capacitance C
oand output resistance R
obe connected in parallel, their positive pole is connected to the first output rectifier diode D
o1with the 3rd output rectifier diode D
o3common cathode, its negative pole is connected to the second output rectifier diode D
o2with the 4th output rectifier diode D
o4the common anode utmost point;
Described transformer adds LLC resonant network and comprises desirable high frequency transformer T, a resonant inductance L
r, magnetizing inductance L
mwith resonance capacitor C
r; Described desirable high frequency transformer T comprises two winding n
1and n
2, the first winding n
1as former limit winding, the second winding n
2as secondary winding; The first winding n
1with magnetizing inductance L
mparallel connection, resonant inductance L
rone end and the first winding n
1same Name of Ends connect, resonant inductance L
rthe other end and the first switching tube S
1source electrode be connected; Resonant capacitance C
rone end and the first winding n
1non-same polarity connect, resonant capacitance C
rthe other end and the 3rd switching tube S
3source electrode be connected; The second winding n
2same Name of Ends and the first output rectifier diode D
o1anodic bonding, the second winding n
2non-same polarity and the 3rd output rectifier diode D
o3anodic bonding.
The control method of LLC mode of resonance three port DC-DC converters of the present invention, it thes contents are as follows: described four switching tube S in former limit
1～S
4what adopt frequency conversion+duty ratio jointly controls mode, the first switching tube S
1with the 3rd switching tube S
3duty ratio be D, second switch pipe S
2with the 4th switching tube S
4duty ratio be 1-D, the first switching tube S
1leading the 3rd switching tube S of driving
3180 ° of drivings, second switch pipe S
2leading the 4th switching tube S of driving
4180 ° of drivings; Meanwhile, first to fourth switching tube S
1～S
4there is identical switching frequency f
s, change duty ratio D and switching frequency f
scan regulate power output and the output port voltage of DC source simultaneously, realize the transmission of port energy is controlled.
Feature of the present invention and technique effect:
(1) by two-way buck-boost circuit and the full-bridge LLC resonant circuit of crisscross parallel operation are integrated, form three port DC-DC converters, realized the multiplexing of switching tube, reduced the quantity of switching tube, improved the power density of converter;
(2) first I/O DC source V
s1with the second I/O DC source V
s2all can realize bidirectional energy transmission, the energy management of being convenient to system is controlled, and contributes to the efficient utilization of input source energy;
(3) in LLC resonant network, the first inductance L
b1with the second inductance L
b2effect under, it is open-minded that all switching tubes of former limit circuit can be realized ZVS, all rectifying tubes of secondary circuit all can be realized ZCS and turn-off, and reduce the switching loss of converter, thereby can make switching frequency further improve, and are easy to realize the high power density of converter;
(4), because of the work of the two-way buck-boost circuit of former limit circuit crisscross parallel, so can significantly reduce the value of current ripples and filter capacitor, be applicable in the systems such as access new forms of energy and energy storage;
(5) adopt the mode that jointly controls of frequency conversion+duty ratio: the second I/O DC source V
s2to the first I/O DC source V
s1gain be duty ratio D, by regulating duty ratio D can control the first I/O DC source V
s1voltage or the second I/O DC source V
s2voltage; Output voltage V
oto the first I/O DC source V
s1the DC current gain of voltage is relevant with duty ratio, switching frequency and quality factor, and along with duty ratio is away from 0.5, gain reduces gradually; Along with the increase gain of switching frequency reduces gradually; Along with the increase of quality factor, gain reduces gradually.
Accompanying drawing explanation
Fig. 1 is the circuit structure schematic diagram of LLC mode of resonance three port DC-DC converters of the present invention;
Fig. 2 is the groundwork oscillogram of LLC mode of resonance three port DC-DC converters of the present invention;
Fig. 3 is each stage equivalent circuit diagram of LLC mode of resonance three port DC-DC converters of the present invention;
Fig. 4 is that LLC mode of resonance three port DC-DC converters of the present invention are combined in electric power system at photovoltaic-storage battery, the power flow direction figure of each mode of operation;
Fig. 5 is that LLC mode of resonance three port DC-DC converters of the present invention are combined in electric power system at photovoltaic-storage battery, mode of operation analogous diagram;
Symbol implication: V in figure
s1the first I/O DC source, V
s2the second I/O DC source, C
s1the first input capacitance, C
s2the second input capacitance, I
s1the electric current of the first I/O DC source, I
s2the electric current of the second I/O DC source, P
s1the power of the first I/O DC source, P
s2the power of the second I/O DC source, L
b1the first inductance, L
b2the second inductance, i
lb1the electric current of the first inductance, i
lb2the electric current of the second inductance, S
1～S
4first to fourth switching tube, C
oss1～C
oss4respectively first to fourth switching tube S
1～S
4spur performance electric capacity or shunt capacitance, L
rresonant inductance, C
rresonant capacitance, L
mmagnetizing inductance, i
lrresonant inductance electric current, u
tankformer and later two brachium pontis mid-point voltages, i.e. the input voltage of resonant slots, T is high frequency transformer, n
1, n
2the first and second windings of high frequency transformer, D
o1～D
o4first to fourth output diode, C
ooutput capacitance, R
ooutput resistance, I
ooutput current, P
obe power output, D is first and the duty ratio of the 3rd switching tube, T
sswitch periods, t
deaddead Time, P
pvphotovoltaic power output, P
batit is the power output of storage battery.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
For application such as renewable energy power generation, electric automobile and energy-storage systems, the present invention proposes a kind of three port DC-DC converter and control methods thereof of LLC mode of resonance, its circuit structure is as shown in Figure 1.This converter adds LLC resonant network three parts by former limit circuit, secondary circuit, transformer and forms, its limit, Central Plains circuit consists of the full bridge unit of the integrated two-way buck-boost circuit of two-way crisscross parallel, secondary circuit consists of rectification circuit, and transformer adds LLC resonant network by high frequency transformer, resonant inductance L
r, magnetizing inductance L
mwith resonance capacitor C
rform.By regulating duty ratio and the frequency of former limit contactor pipe, can to the directed energy transmission of the bidirectional energy transmission between the port of two, former limit and output, control effectively simultaneously.
As shown in Figure 1, described LLC mode of resonance three port DC-DC converters are by the first I/O DC source V
s1, the second I/O DC source V
s2, the first capacitor C
s1, the second capacitor C
s2, the first inductance L
b1, the second inductance L
b2, the first switching tube S
1, second switch pipe S
2, the 3rd switching tube S
3, the 4th switching tube S
4, the first output rectifier diode D
o1, the second output rectifier diode D
o2, the 3rd output rectifier diode D
o3, the 4th output rectifier diode D
o4, output capacitance C
o, output resistance R
o, desirable high frequency transformer T, resonant inductance L
r, magnetizing inductance L
mwith resonance capacitor C
rform;
First to fourth switching tube S
1～S
4form full bridge unit, wherein the first switching tube S
1source electrode and second switch pipe S
2drain electrode connect, form the front brachium pontis of full bridge unit, the 3rd switching tube S
3source electrode and the 4th switching tube S
4drain electrode connect, form the rear brachium pontis of full bridge unit, former and later two brachium pontis are connected in parallel; The first DC source V
s1with the first input capacitance C
s1, full bridge unit is connected in parallel; The second DC source V
s2with the second input capacitance C
s2parallel connection, their positive pole connects the first inductance L
b1with the second inductance L
b2common port.The first inductance L
b1the other end be connected with front brachium pontis mid point, the second inductance L
b2the other end be connected with rear brachium pontis mid point; The first output rectifier diode D
o1anode and the second output rectifier diode D
o2negative electrode connect, the 3rd output rectifier diode D
o3anode and the 4th output rectifier diode D
o4negative electrode connect, the first output rectifier diode D
o1with the 3rd output rectifier diode D
o3common cathode connects, the second output rectifier diode D
o2with the 4th output rectifier diode D
o4be total to anodic bonding, output capacitance C
oand output resistance R
obe connected in parallel, their positive pole is connected to the first output rectifier diode D
o1with the 3rd output rectifier diode D
o3common cathode, negative pole is connected to the second output rectifier diode D
o2with the 4th output rectifier diode D
o4the common anode utmost point; The first winding n
1as former limit winding, the second winding n
2as secondary winding, the first winding n
1with magnetizing inductance L
min parallel; Resonant inductance L
rone end and the first winding n
1same Name of Ends connect, the other end and the first switching tube S
1source electrode be connected; Resonant capacitance C
rone end and the first winding n
1non-same polarity connect, the other end and the 3rd switching tube S
3source electrode be connected; The second winding n
2same Name of Ends and the first output rectifier diode D
o1anodic bonding, the second winding n
2non-same polarity and the 3rd output rectifier diode D
o3anodic bonding.
The control method of LLC mode of resonance three port DC-DC converters of the present invention: described four switching tube S in former limit
1～S
4what adopt frequency conversion+duty ratio jointly controls mode, the first switching tube S
1with the 3rd switching tube S
3duty ratio be D, second switch pipe S
2with the 4th switching tube S
4duty ratio be 1-D, the first switching tube S
1leading the 3rd switching tube S of driving
3180 ° of drivings, second switch pipe S
2leading the 4th switching tube S of driving
4180 ° of drivings; Meanwhile, first to fourth switching tube S
1～S
4there is identical switching frequency f
s; As shown in Fig. 2 (a), when D<0.5, resonant slots voltage u
tankduty ratio be D; As shown in Fig. 2 (b), when D>=0.5, resonant slots voltage u
tankduty ratio be 1-D; Change duty ratio D and switching frequency f
scan regulate the power output of DC source and the output voltage of output port simultaneously, realize the transmission of port energy is controlled.
Below in conjunction with Fig. 2 and Fig. 3, the specific works process of LLC mode of resonance three port DC-DC converters of the present invention is analyzed.
During duty ratio D<0.5, the driving signal of converter and groundwork waveform are as shown in Figure 2.Converter has ten switch mode, [t in a switch periods
0, t
5] be 5 switch mode in half switch periods, its equivalent electric circuit is as shown in Figure 3.
1) mode 1 (t
0～t
1), corresponding to Fig. 3 (a): at t
0constantly, the 4th switching tube S
4conducting, at t
0constantly, the first switching tube S
1conducting.In this period, resonant slots voltage u
tankequal busbar voltage V
s1, resonance current i
lrbe greater than magnetizing inductance current i
lm, current i
lrand i
lmdifference by transformer, to secondary, power, secondary first output rectifier diode D
o1, the 4th output rectifier diode D
o4conducting, L
mboth end voltage is output voltage clamp to nV
o, i
lmlinear rising.Meanwhile, the first inductance L
b1electric discharge is to the first I/O DC source V
s1, DC source V
s2give the second inductance L
b2linear-charging.In this stage, only has resonant inductance L
rwith resonance capacitor C
rparticipate in resonance.
2) mode 2 (t
1～t
2), corresponding to Fig. 3 (b): at t
1constantly, the first switching tube S
1turn-off second switch pipe S
2not conducting.In this period, i
lrbe greater than i
lm, resonant inductance current i
lrwith inductive current i
lb1acting in conjunction, gives capacitor C
oss1charging, give C
oss2electric discharge.After having discharged and recharged, C
oss2voltage reduce to 0, second switch pipe S
2body diode conducting, be second switch pipe S
2zVS the condition that provides is provided.
3) mode 3 (t
2～t
3), corresponding to Fig. 3 (c): t
2constantly start second switch pipe S
2zVS is open-minded.This stage i
lrbe greater than i
lm, secondary the first output rectifier diode D
o1, the second output rectifier diode D
o4continue conducting, magnetizing inductance L
mboth end voltage continues to be clamped at nV
o, it does not still participate in resonance, i
lmcontinue linear rising.But due to resonant slots voltage u
tankthe=0, first I/O DC source V
s1energy is not provided, and the energy that transmit to secondary on former limit is completely by resonant inductance L
rwith resonance capacitor C
rresonant network provides, so i
lrdecline rapidly.Due to second switch pipe S
2, the 4th switching tube S
4conducting, the second I/O DC source V
s2to the first inductance L
b1with the 2nd L
b2charging, current i
lb1, i
lb2linear rising.
4) mode 4 (t
3～t
4), corresponding to Fig. 3 (d): at t
3constantly, i
lrdrop to and i
lmequate the first output rectifier diode D
o1realizing ZCS turn-offs.In this stage, magnetizing inductance L
mno longer by clamper, itself and resonant inductance L
rwith resonance capacitor C
rparticipate in together resonance.The second I/O DC source V
s2still to the first inductance L
b1with the 2nd L
b2charging, current i
lb1, i
lb2linear rising.Secondary the first output rectifier diode D
o1to the 4th output rectifier diode D
o4all oppositely cut-off, flows through the first output rectifier diode D
o1, the 4th output rectifier diode D
o4electric current be natural zero-crossing, be therefore zero-current switching.Former limit is no longer to secondary output energy, by output capacitance C
opower to the load.
5) mode 5 (t
4～t
5), corresponding to Fig. 3 (e): at t
4constantly, the 4th switching tube S
4turn-off the 3rd switching tube S
3not conducting.In this period, i
lrequal i
lm, i
lrwith i
lb2one same-action is given the 4th switching tube S
4output capacitance C
oss4charging, give the 3rd switching tube S
3output capacitance C
oss3electric discharge, after having discharged and recharged, C
oss3voltage reduce to 0, the three switching tube S
3body diode conducting, be the 3rd switching tube S
3zVS the condition that provides is provided.
At t
5constantly, the 3rd switching tube S
3zVS is open-minded, and converter enters lower half period, and its operation principle is similar to upper half period.Meanwhile, the working condition of D >=0.5 o'clock is similar during to D<0.5, so all repeat no more at this.
By the first I/O DC source V
s1replace to storage battery, the second I/O DC source V
s2replace to photovoltaic cell, can form photovoltaic-storage battery associating electric power system.
Below in conjunction with Fig. 4 and Fig. 5, the photovoltaic of application LLC mode of resonance three port DC-DC converters of the present invention-storage battery associating electric power system is further described.
As shown in Figure 4, photovoltaic-storage battery associating electric power system of applying LLC mode of resonance three port DC-DC converters of the present invention has four kinds of power delivery patterns, is respectively power delivery pattern I～IV.
Power delivery pattern I: bearing power P
oequal the power P that photovoltaic cell sends
pv, photovoltaic cell is separately to bearing power, and storage battery is not worked, in stand-by state.
Power delivery pattern II: bearing power P
obe greater than the power P that photovoltaic cell sends
pv, photovoltaic cell is not enough to provide the most enough power to output loading, and storage battery participation work, also to load through-put power.
Power delivery pattern III: bearing power P
obe less than the power P that photovoltaic cell sends
pv, the unnecessary power of photovoltaic cell is transmitted to storage battery, and stored energy is got up.
Power delivery pattern IV: photovoltaic cell is not worked, and storage battery powers to the load separately.
The analogous diagram of the photovoltaic that Fig. 5 is application LLC mode of resonance three port DC-DC converters of the present invention-storage battery associating electric power system under each power delivery pattern.The first I/O DC source V
s1for storage battery, the second I/O DC source V
s2for photovoltaic cell.Can find out, when LLC mode of resonance three port DC-DC converters of the present invention reach stable state, output voltage can be stabilized in 400V all the time; When condition of work changes, storage battery port can, according to the difference power between photovoltaic cell and load, compensate in real time; Voltage, current overshoot that pattern switching simultaneously causes are less, and required switching frequency adjustable range is also narrow, has not only realized the efficient utilization of energy, and has improved the reliability of photovoltaic cell system.
Claims (2)
1. LLC mode of resonance three port DC-DC converters, it is characterized in that: it is by former limit circuit, secondary circuit and transformer, to add LLC resonant network to form, described former limit circuit is that the full bridge unit by the integrated two-way buck-boost circuit of two-way crisscross parallel forms, described secondary circuit is to consist of rectification circuit, and it is by high frequency transformer, resonant inductance L that transformer adds LLC resonant network
r, magnetizing inductance L
mwith resonance capacitor C
rform; By regulating duty ratio and the frequency of former limit contactor pipe, can to the directed energy transmission of the bidirectional energy transmission between the port of two, former limit and output, control effectively simultaneously;
Described former limit circuit comprises the first I/O DC source V
s1, the second I/O DC source V
s2, the first capacitor C
s1, the second capacitor C
s2, the first inductance L
b1, the second inductance L
b2and first to fourth switching tube S
1～S
4; The first switching tube S
1, second switch pipe S
2, the 3rd switching tube S
3with the 4th switching tube S
4form full bridge unit, wherein the first switching tube S
1source electrode and second switch pipe S
2drain electrode connect, form the front brachium pontis of full bridge unit, the 3rd switching tube S
3source electrode and the 4th switching tube S
4drain electrode connect, form the rear brachium pontis of full bridge unit, former and later two brachium pontis are connected in parallel; The first DC source V
s1with the first input capacitance C
s1, full bridge unit is connected in parallel; The second DC source V
s2with the second input capacitance C
s2parallel connection, the second DC source V
s2positive pole connect the first inductance L
b1with the second inductance L
b2common port, the first inductance L
b1the other end be connected with front brachium pontis mid point, the second inductance L
b2the other end be connected with rear brachium pontis mid point;
Described secondary circuit comprises the first output rectifier diode D
o1, the second output rectifier diode D
o2, the 3rd output rectifier diode D
o3, the 4th output rectifier diode D
o4, output capacitance C
owith output resistance R
o; The first output rectifier diode D
o1anode and the second output rectifier diode D
o2negative electrode connect, the 3rd output rectifier diode D
o3anode and the 4th output rectifier diode D
o4negative electrode connect, the first output rectifier diode D
o1with the 3rd output rectifier diode D
o3common cathode connects, the second output rectifier diode D
o2with the 4th output rectifier diode D
o4be total to anodic bonding, output capacitance C
oand output resistance R
obe connected in parallel, their positive pole is connected to the first output rectifier diode D
o1with the 3rd output rectifier diode D
o3common cathode, its negative pole is connected to the second output rectifier diode D
o2with the 4th output rectifier diode D
o4the common anode utmost point;
Described transformer adds LLC resonant network and comprises a high frequency transformer T, resonant inductance L
r, magnetizing inductance L
mwith resonance capacitor C
r; Described high frequency transformer T comprises two winding n
1and n
2, the first winding n
1as former limit winding, the second winding n
2as secondary winding; The first winding n
1with magnetizing inductance L
mparallel connection, resonant inductance L
rone end and the first winding n
1same Name of Ends connect, resonant inductance L
rthe other end and the first switching tube S
1source electrode be connected; Resonant capacitance C
rone end and the first winding n
1non-same polarity connect, resonant capacitance C
rthe other end and the 3rd switching tube S
3source electrode be connected; The second winding n
2same Name of Ends and the first output rectifier diode D
o1anodic bonding, the second winding n
2non-same polarity and the 3rd output rectifier diode D
o3anodic bonding.
2. the control method of LLC mode of resonance three port DC-DC converters according to claim 1, is characterized in that: it thes contents are as follows: described four switching tube S in former limit
1～S
4what adopt frequency conversion+duty ratio jointly controls mode, the first switching tube S
1with the 3rd switching tube S
3duty ratio be D, second switch pipe S
2with the 4th switching tube S
4duty ratio be 1-D, the first switching tube S
1leading the 3rd switching tube S of driving
3180 ° of drivings, second switch pipe S
2leading the 4th switching tube S of driving
4180 ° of drivings; Meanwhile, first to fourth switching tube S
1～S
4there is identical switching frequency f
s, change duty ratio D and switching frequency f
scan regulate power output and the output port voltage of DC source simultaneously, realize the transmission of port energy is controlled.
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