CN106602882A - Power electronic transformer based on DC-DC converter and control method thereof - Google Patents
Power electronic transformer based on DC-DC converter and control method thereof Download PDFInfo
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- CN106602882A CN106602882A CN201710058735.3A CN201710058735A CN106602882A CN 106602882 A CN106602882 A CN 106602882A CN 201710058735 A CN201710058735 A CN 201710058735A CN 106602882 A CN106602882 A CN 106602882A
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Classifications
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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
- H02M3/338—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 in a self-oscillating arrangement
- H02M3/3382—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 in a self-oscillating arrangement in a push-pull circuit arrangement
-
- 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
- H02M3/305—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 thyratron or thyristor type requiring extinguishing means
- H02M3/315—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 thyratron or thyristor type requiring extinguishing means using semiconductor devices only
-
- 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
- H02M3/33584—Bidirectional converters
Abstract
The present invention provides a power electronic transformer based on DC-DC converter and a control method thereof. The power electronic transformer comprises a DC-AC convertor topology module, an AC-DC converter topology module and a high-frequency transformer; the DC-AC converter topology module and the AC-DC converter topology module employ the symmetrical structures; the DC-AC converter topology module is connected with the primary side of the high-frequency transformer; and the AC-DC converter topology module is connected with the secondary side of the high-frequency transformer. The power electronic transformer takes a DC-DC converter with a simple structure as a basis and employs a symmetrical circuit structure to realize the two-way transmission of energy, and at the aspect of the control method, the power electronic transformer employs a free vibration mode and an energy injection mode to have better control performance.
Description
Technical field
The present invention relates to Power Electronic Technique, more particularly, to a kind of Technics of Power Electronic Conversion based on DC-DC converter
Device and its control method.
Background technology
At present, with the development of science and technology production, in the world DC/DC parts have become main, core in power supply product
Part.Communication equipment, the power supply great majority of computer equipment are DC-voltage supplies.The application of two-way DC/DC changers
Also it is increasingly wider, in being mainly used in the Vehicular power systems such as DC power system, aviation power system and electric automobile.While people
Class increasingly increases the demand of the energy, and with the continuous exhaustion of traditional fossil energy, the utilization of regenerative resource is more and more important.
Although regenerative resource has the advantages that many, most of regenerative resources exist supply of electric power it is unstable, discontinuous,
With defects such as weather conditions changes.
The content of the invention
The present invention is provided and a kind of overcomes the problems referred to above or one kind for solving the above problems at least in part to be become based on DC-DC
The electric power electric transformer and its control method of parallel operation.
According to an aspect of the present invention, there is provided a kind of electric power electric transformer based on DC-DC converter, including：
DC-AC converter topology modules, AC-DC converter topography module and high frequency transformer, the DC-AC changers are opened up
Flutter module and adopt symmetrical structure, the DC-AC converter topologies module and high frequency transformation with the AC-DC converter topography module
The former limit of device is connected, and the AC-DC converter topography module is connected with the secondary of high frequency transformer.
According to a further aspect in the invention, a kind of control of the electric power electric transformer based on DC-DC converter is additionally provided
Method processed, including：
The DC-AC converter topologies module and AC-DC converter topography module of design symmetrical structure, the DC-AC conversion
Electrical isolation is carried out by high frequency transformer between device topography module and the AC-DC converter topography module.
Beneficial effects of the present invention are：The electric power electric transformer based on a kind of DC-DC converter of simple structure,
Using symmetrical circuit structure, the transmitted in both directions of energy is realized so that whole electric power electric transformer can be other systems
Continued power, in terms of control method, using free-run mode and energy injection pattern, with more preferable control performance.
Description of the drawings
Fig. 1 is the electric power electric transformer electrical block diagram based on DC-DC converter of one embodiment of the invention；
Fig. 2 is electric power electric transformer medium/high frequency transformer equivalent circuit diagram；
Fig. 3-a are the energy injection pattern fundamental diagram of DC-AC converter topology modules；
Fig. 3-b are the free-run mode fundamental diagram of DC-AC converter topology modules；
Fig. 4-a are the energy injection pattern fundamental diagram of AC-DC converter topography module；
Fig. 4-b are the free-run mode fundamental diagram of AC-DC converter topography module；
Fig. 5 is the input voltage schematic diagram of former limit high-frequency circuit；
Fig. 6 is the on off sequence and waveform of DC-AC converter topology modules；
Fig. 7 is the on off sequence and waveform of AC-DC converter topography module；
Fig. 8 is the oscillogram that primary input, resonance current and the first HF switch control pulse；
Fig. 9 is the oscillogram of former limit resonance current and secondary load output voltage under load switching.
Specific embodiment
With reference to the accompanying drawings and examples, the specific embodiment of the present invention is described in further detail.Hereinafter implement
Example is not limited to the scope of the present invention for illustrating the present invention.
An embodiment provides the electric power electric transformer based on DC-DC converter, power electronics change
Depressor includes DC-AC converter topologies module 1, AC-DC converter topography module 2 and high frequency transformer 3, the DC-AC conversion
Device topography module 1 and the AC-DC converter topography module 2 adopt symmetrical structure, the DC-AC converter topologies module 1 with
The former limit of high frequency transformer 3 is connected, and the AC-DC converter topography module 2 is connected with the secondary of high frequency transformer 3.This enforcement
Electric power electric transformer in example, using symmetrical circuit structure, is realized based on a kind of DC-DC converter of simple structure
The transmitted in both directions of energy so that whole electric power electric transformer can power for other system bidirectionals, with persistence.
Wherein, DC-AC converter topologies module 1 includes DC source and DC-AC changers, and DC-AC changers include original
Side high-frequency electrical energy change-over circuit 11 and former limit high-frequency circuit 12, DC source passes through the He of former limit high-frequency electrical energy change-over circuit 11
Former limit high-frequency circuit 12 is connected with the former limit of high frequency transformer 3；AC-DC converter topography module 2 includes electric capacity of voltage regulation, bears
Carry and AC-DC converter, AC-DC converter includes secondary high-frequency electrical energy change-over circuit 22 and secondary high-frequency circuit 21, high
The secondary of frequency power transformer 3 is connected by secondary high-frequency circuit 21 and secondary high-frequency electrical energy change-over circuit 22 with load, voltage stabilizing
Electric capacity is in parallel with load, and electric capacity of voltage regulation plays a part of voltage stabilizing to the unidirectional current exported in load.
DC source Jing former limit high-frequency electrical energys change-over circuit 11 obtains the ac square wave signal of constant frequency perseverance width, constant frequency perseverance width
Ac square wave signal Jing former limit high-frequency circuit 12 is converted to the AC signal input tremendously high frequency transformation with permanent envelope trait
Device 3 carries out electrical isolation, and Jing secondary high-frequency circuit 21 produces high-frequency induction electromotive force, and high-frequency induction electromotive force is through secondary
Side high-frequency electrical energy change-over circuit 22 carries out AC-DC conversion, obtains stable DC voltage and exports in load.
Wherein, it is the equivalent schematic diagram of high frequency transformer 3 of the present embodiment referring to Fig. 2, the DC-AC converter topologies in Fig. 1
Module 1 and AC-DC converter topography module 2 are connected by high frequency transformer 3.High frequency transformer 3 in the present embodiment is designed as
Loose coupled transformer, the coefficient of coup of loose coupled transformer is relatively low, and the leakage inductance of both sides winding is larger, L in Fig. 2p、LsPoint
Not Wei the former and deputy side winding of high frequency transformer 3 leakage inductance, Rp、RsThe respectively resistance of the former and deputy side winding of high frequency transformer 3, M is two
The mutual inductance of side winding.This loose coupled transformer can be considered as the both sides that two inductance are connected on close coupling transformator.Institute
To be because that the series resonance link of high-frequency converter needs resonant inductance using this high frequency transformer 3, therefore, it can with pine
Resonant inductance of the leakage inductance of scattered coupling transformer needed for replace resonance link, i.e. LpEqual to former limit resonant inductance, LsEqual to secondary
Resonant inductance.
Above-mentioned former limit high-frequency electrical energy change-over circuit 11 includes the first HF switch and the second HF switch, former limit harmonic high frequency
The circuit 12 that shakes includes that former limit resonant capacitance and one end of former limit resonant inductance, the positive pole of DC source and the first HF switch connect
Connect, the other end of the first HF switch is connected respectively with one end of the second HF switch and one end of former limit resonant capacitance, direct current
The negative pole of power supply is connected with the other end of the second HF switch, and the other end of former limit resonant capacitance is by former limit resonant inductance and the
The other end connection of two HF switches；The leakage inductance of the primary side winding of high frequency transformer 3 replaces the former limit resonant inductance.What is be input into is straight
Stream power supply obtains the ac square wave signal of constant frequency perseverance width through the conversion of former limit high-frequency electrical energy change-over circuit 11, then again through former limit
Ac square wave signal is converted to the form of energy with permanent envelope trait by high-frequency circuit 12, is input into high frequency transformer 3
Former limit carries out electrical isolation.Former limit high-frequency circuit 12 causes DC-AC changers to always work in resonant type soft-switch state, changes
The kind quality of power supply.
Above-mentioned secondary high-frequency circuit 21 includes secondary resonant inductance and secondary resonant capacitance, and secondary high-frequency electrical energy turns
Changing circuit 22 includes the 3rd HF switch and the 4th HF switch, one end of secondary resonant inductance and one end of secondary resonant capacitance
Connection, the other end of secondary resonant capacitance is connected respectively with one end of the 4th HF switch and one end of the 3rd HF switch, secondary
The other end of side resonant inductance is connected with the other end of the 4th HF switch, and the other end of the 3rd HF switch is by load and pair
The other end connection of side resonant inductance；The leakage inductance of the vice-side winding of high frequency transformer 3 replaces the secondary resonant inductance.Former limit high frequency
Ac square wave signal is converted to the form of energy with permanent envelope trait, the basis of secondary high-frequency circuit 21 by resonance circuit 12
Voltage signal with permanent envelope trait produces high-frequency induction electromotive force, then through the AC-DC conversion of secondary high-frequency circuit 21
Afterwards, DC voltage is converted to through load output.Secondary high-frequency circuit 21 causes DC-AC changers to always work in resonance
Sofe Switch state, improves the quality of power supply.
An alternative embodiment of the invention provides a kind of controlling party of the electric power electric transformer based on DC-DC converter
Method, in order to realize the transmitted in both directions of energy, the DC-AC converter topologies module and AC-DC converter for devising symmetrical structure is opened up
Flutter module, between DC-AC converter topologies module and AC-DC converter topography module by high frequency transformer carry out electrically every
From.Based on the DC-DC converter of simple structure, using symmetrical circuit structure, the single-stage two-way that can realize energy is passed
It is defeated.
The mode of operation of DC-AC converter topologies module 1 is controlled by former limit high-frequency electrical energy change-over circuit 11, specially can
Amount two kinds of mode of operations of injection way and free-run mode.Referring to Fig. 3-a and Fig. 3-b, respectively DC-AC converter topologies mould
The operation principle and the operation principle of free-run mode of the energy injection pattern of block 1.
In the positive circulation of the positive transmission of energy, input dc power and the electric current of former limit high-frequency circuit 12, the first high frequency
Switch conduction, the shut-off of the second HF switch, input dc power injects former limit resonant network through HF switch, lifts resonance electricity
Stream, this kind of mode of operation is energy injection pattern；In the positive transmission of energy and the circulation of the electric current negative sense of former limit high-frequency circuit 12
When, the conducting of the second HF switch, the shut-off of the first HF switch, the resonance current of former limit high-frequency circuit 12 is through the second high frequency
Switch flowing, this kind of mode of operation is free-run mode.When to input DC power in DC-AC converter topologies module 1,
By the control of mode of operation so that the first HF switch and the second HF switch alternating, complementary are turned on, and realize zero current
Switching, thus the former limit in high frequency transformer 3 just generates high frequency exciting current.Wherein, DC-AC converter topologies module 1
Energy injection time and free oscillation time are equal to the half of the harmonic period of former limit high-frequency circuit 12.Become in DC-AC
In the mode of operation of parallel operation topography module 1, angle of flow when the first HF switch and second HF switch are turned on is 180
Degree, turn-on cycle is the resonance current cycle of former limit high-frequency circuit 12.
Likewise, the mode of operation of AC-DC converter topography module 2 is controlled by secondary high-frequency electrical energy change-over circuit 22,
Specially two kinds of mode of operations of energy injection pattern and free-run mode.Referring to Fig. 4-a and Fig. 4-b, respectively AC-DC conversion
The operation principle and the operation principle of free-run mode of the energy injection pattern of device topography module 2.
When the resonance current negative sense of the positive transmission of energy and secondary high-frequency circuit 21 circulates, the 4th high frequency is opened
Conducting is closed, the 3rd high frequency switch OFF, the resonance current of the secondary high-frequency circuit 21 flows through the 4th HF switch,
This kind of mode of operation is free-run mode；In the positive transmission of energy and the resonance current forward stream of secondary high-frequency circuit 21
When logical, the 3rd high frequency switch conduction, the shut-off of the 4th HF switch, the resonance current Jing of the secondary high-frequency circuit 21
The injection load of the 3rd HF switch is crossed, this kind of mode of operation is energy injection pattern.Both patterns realize the 3rd high frequency and open
Close and the 4th HF switch zero current switching, complete the conversion and transmission of energy, it is stable straight so as to obtain in load
Stream voltage output.
It is the input voltage schematic diagram of former limit high-frequency circuit 12 referring to Fig. 5, the power electronics that the present embodiment is provided becomes
The operation principle of the free-run mode of depressor and the control method of energy injection pattern is：Direct-flow input signal is carried out in Fu
Leaf decomposes, and the high frequency square wave pulse signal being applied on resonant network is analyzed using area equivalent principle.Fourier
Leaf decomposes certain function representation that will meet certain condition into trigonometric function (sinusoidal and/or cosine function) or their integration
Linear combination.When area equivalent principle is that the equal and variform burst pulse of momentum is applied on inertial element, its output phase
Answer waveform essentially identical.Assume that input DC power amplitude is V, the high-frequency square-wave signal amplitude obtained Jing after HF switch is V, frequently
Rate is fa, the cycle is Ta, resonance current frequency cycle is Tc.Now, input signal being carried out into Fourier decomposition can obtain t
Input voltage instantaneous value VdT () is expressed as:
Because resonant frequency is significantly larger than switching frequency, each integral unit of high frequency voltage pulse is rectangular area SABCD.In order to study
The virtual value of primary resonant electric current, that is, calculate the high frequency voltage pulse V for being applied to primary series resonant networkiArea.Then during j
The potential pulse area S at quarterjFor now alternating voltage instantaneous value ViThe product of (t) and resonance half period：Sj=0.5TcVi(j).For
Power transmission maximized is realized, the series resonance frequency on the former and deputy side of high frequency transformer should be consistent, so the system resonance cycle
TcFor：ω0For system resonance angular frequency, the electricity in half power cycle
Pressure pulse area S be： Wherein N is：So injection resonant network
Alternating voltage virtual value is： Corresponding high frequency transformer primary current iLPFor：
ReqFor the equiva lent impedance that transformer secondary reflexes to former limit, it is under resonance：Wherein M is mutual inductance,
ZsFor transformer secondary total impedance：RfFor transformer secondary resonant network output port
Equivalent resistance, R2For the resistance of high frequency transformer vice-side winding.Resonance current iLPIn the high-frequency electromagnetic that transformer primary side is formed
Field is in secondary inductance LsThe induction electromotive force V of middle formationsFor：VS=ω0MiLP.The then resonance current i of transformer secondaryLSFor：Joint preceding formula can be obtained： Secondary resonance electric current as can be seen from the above equation
The characteristic of constant current is presented, with load RLResistance sizes it is unrelated.Had according to energy conservation principle：In can be to obtain output current to be： Can see from above formula
The size of output current is unrelated with the load resistance in electric power electric transformer.If the coefficient of coup of system medium/high frequency transformer
It is improper to arrange, and system frequency will appear from bifurcated, and output constant current characteristic will be unable to ensure.To guarantee that series resonant circuit is operated in only
One resonance angular frequency ω0, then for different loading ranges, the design of the coefficient of coup should meet： Wherein k is the coefficient of coup,Therefore, as load RLIt is defeated during resistance variations
Go out voltage and corresponding change also occurs, it is proportional.
Fig. 6 is the on off sequence and waveform of DC-AC converter topologies module 1 in the present embodiment, during energy forward direction transmission, when
During input DC power, the first HF switch and the second HF switch alternating, complementary are turned on, when the second HF switch is turned on, first
When HF switch is turned off, the circulation of resonance current negative sense；When the conducting of the first HF switch, when the second HF switch is turned off, resonance electricity
The positive circulation of stream, both are 180 degree at angle of flow.
Fig. 7 be the present embodiment in AC-DC converter topography module 2 on off sequence and waveform, with DC-AC changers
As topography module 1, in the same manner, the 3rd HF switch and the 4th HF switch alternating, complementary are turned on.When the 4th HF switch is turned on,
During the 3rd high frequency switch OFF, the circulation of resonance current negative sense；It is humorous when the 4th HF switch is turned off when the 3rd high frequency switch conduction
The positive circulation of the electric current that shakes, both are 180 degree at angle of flow.
Wherein, the DC-AC converter topologies module 1 of whole electric power electric transformer and AC-DC converter topography module 2
On off state is as shown in table 1 below.
Table 1
In addition, the application sets up phantom under MATLAB/SIMULINK environment, electric energy transmits to be converted from DC-AC
To as a example by AC-DC converter topography module 2, supply voltage is the unidirectional current that amplitude is 100V to device topography module 1, primary and secondary side
Resonant capacitance be 0.15uF, resonant inductance is 423uH, and the mutual inductance of high frequency transformer 3 is 211uH.
Fig. 8 is electric power electric transformer after into stable state, primary input voltage V and resonance current iLPOscillogram and
Stable state resonance current iLPWith the control signal result of the comparison of switching tube S1 after local expansion, it can be seen that primary humorous
Shake electric current iLPPermanent envelope trait is presented, amplitude is 6.4A or so, and this is the reason due to input voltage V for DC source.From
It can be seen that stable state resonance current waveform is the sine wave of the low degree of distortion in comparative result figure, pulse and resonance current phase place are controlled
Unanimously, Sofe Switch is realized.
It can be seen in figure 9 that as load RLDuring from 400 Ω switching at runtime to 200 Ω, resonance current iLPPeak value from
6.4A drops to 4A or so, and exports DC voltage VoAmplitude 150V is dropped to by 300V, still keep it is good continue it is steady
Determine characteristic, realize load RLStable DC voltage output.
A kind of electric power electric transformer and its control method based on DC-DC converter that the present invention is provided, the electric power electricity
Sub- transformator, using symmetrical circuit structure, realizes the two-way biography of energy based on a kind of DC-DC converter of simple structure
It is defeated so that whole electric power electric transformer can power for other systems stays, in terms of control method, using free oscillation
Pattern and energy injection pattern, with more preferable control performance.The electric power electric transformer realizes the single-stage transmission of energy, enters
One step increases the efficiency of transmission of DC-DC transformators, and control is simple, and power device is few, reduces whole electric power electric transformer
Volume；DC-AC changers and AC-DC converter in whole electric power electric transformer always works in resonant type soft-switch shape
State, improves the quality of electric energy so that when switching at runtime is loaded, and electric power electric transformer can keep output corresponding stable
The characteristic of DC voltage.
Finally, the present processes are only preferably embodiment, are not intended to limit protection scope of the present invention.It is all
Within the spirit and principles in the present invention, any modification, equivalent substitution and improvements made etc. should be included in the protection of the present invention
Within the scope of.
Claims (10)
1. a kind of converters based on DC-DC converter, it is characterised in that including DC-AC converter topology modules
(1) and AC-DC converter topography module (2) and high frequency transformer (3), the DC-AC converter topologies module (1) with it is described
AC-DC converter topography module (2) adopts symmetrical structure, the DC-AC converter topologies module (1) and high frequency transformer (3)
Former limit be connected, the AC-DC converter topography module (2) is connected with the secondary of high frequency transformer (3).
2. converters as claimed in claim 1, it is characterised in that DC-AC converter topologies module (1) bag
DC source and DC-AC changers are included, the DC-AC changers include former limit high-frequency electrical energy change-over circuit (11) and former limit high frequency
Resonance circuit (12), the DC source is by the former limit high-frequency electrical energy change-over circuit (11) and former limit high-frequency resonant electricity
Road (12) is connected with the former limit of high frequency transformer (3)；
The former limit high-frequency electrical energy change-over circuit (11), for carrying out being converted to the friendship of constant frequency perseverance width to the DC source being input into
Stream square-wave signal；
The former limit high-frequency circuit (12), for the ac square wave signal of constant frequency perseverance width to be converted to permanent envelope
The high frequency exciting current of characteristic, and be input into the high frequency transformer (3) and carry out electrical isolation.
3. electric power electric transformer as claimed in claim 2, it is characterised in that AC-DC converter topography module (2) bag
Electric capacity of voltage regulation, load and AC-DC converter are included, the AC-DC converter includes that secondary high-frequency circuit (21) and secondary are high
Frequency electrical energy conversion circuit (22), the secondary of the high frequency transformer (3) is by the secondary high-frequency circuit (21) and secondary
High-frequency electrical energy change-over circuit (22) is connected with load, and the electric capacity of voltage regulation is in parallel with the load；
The secondary high-frequency circuit (21), for producing high-frequency induction electromotive force according to the high frequency exciting current；
The secondary high-frequency electrical energy change-over circuit (22), for carrying out AC-DC conversion to the high-frequency induction electromotive force, obtains
Stable DC voltage is exported in load.
4. electric power electric transformer as claimed in claim 3, it is characterised in that the former limit high-frequency electrical energy change-over circuit (11)
Including the first HF switch and the second HF switch, the former limit high-frequency circuit (12) is including former limit resonant capacitance and former limit
Resonant inductance, the positive pole of the DC source is connected with one end of the first HF switch, the other end of first HF switch
Be connected with one end of second HF switch and one end of the former limit resonant capacitance respectively, the negative pole of the DC source with
The other end connection of second HF switch, the other end of the former limit resonant capacitance is by former limit resonant inductance and described the
The other end connection of two HF switches；
The leakage inductance of high frequency transformer (3) primary side winding replaces the former limit resonant inductance.
5. electric power electric transformer as claimed in claim 4, it is characterised in that the secondary high-frequency circuit (21) includes
Secondary resonant inductance and secondary resonant capacitance, the secondary high-frequency electrical energy change-over circuit (22) is including the 3rd HF switch and the 4th
HF switch, one end of the secondary resonant inductance is connected with one end of the secondary resonant capacitance, the secondary resonant capacitance
The other end be connected with one end of the 4th HF switch and one end of the 3rd HF switch respectively, the secondary resonance
The other end of inductance is connected with the other end of the 4th HF switch, the other end of the 3rd HF switch by load with
The other end connection of the secondary resonant inductance；
The leakage inductance of high frequency transformer (3) vice-side winding replaces the secondary resonant inductance.
6. the control method of the electric power electric transformer based on DC-DC converter described in a kind of any one of claim 1-5, its
It is characterised by, including：
DC-AC converter topology modules (1) and AC-DC converter topography module (2) of design symmetrical structure, the DC-AC become
Electrical isolation is carried out by high frequency transformer (3) between parallel operation topography module (1) and the AC-DC converter topography module (2).
7. control method as claimed in claim 6, it is characterised in that controlled by former limit high-frequency electrical energy change-over circuit (11)
The mode of operation of DC-AC converter topology modules (1), specially：
Energy injection pattern：In the positive transmission of energy, input dc power and the positive circulation of former limit high-frequency circuit (12) electric current
When, the conducting of the first HF switch, the shut-off of the second HF switch, input dc power injects former limit resonant network through HF switch；
Free-run mode：When the positive transmission of energy and former limit high-frequency circuit (12) electric current negative sense are circulated, the second high frequency
Switch conduction, the first HF switch shut-off, the resonance current of former limit high-frequency circuit (12) flows through the second HF switch.
8. control method as claimed in claim 7, it is characterised in that the energy note of the DC-AC converter topologies module (1)
The angle of incidence and free oscillation time are equal to the half of the harmonic period of former limit high-frequency circuit (12).
9. control method as claimed in claim 8, it is characterised in that in the work of the DC-AC converter topologies module (1)
In pattern, angle of flow when first HF switch and second HF switch are turned on is 180 degree, and turn-on cycle is original
The resonance current cycle of side high-frequency circuit (12).
10. control method as claimed in claim 9, it is characterised in that controlled by secondary high-frequency electrical energy change-over circuit (22)
The mode of operation of AC-DC converter topography module (2), specially：
Free-run mode：When the resonance current negative sense of the positive transmission of energy and secondary high-frequency circuit (21) circulates, institute
State the conducting of the 4th HF switch, the 3rd high frequency switch OFF, the resonance current of the secondary high-frequency circuit (21) is through the
Four HF switches flow；
Energy injection pattern：In the positive circulation of the resonance current of the positive transmission of energy and secondary high-frequency circuit (21), institute
State the 3rd high frequency switch conduction, the shut-off of the 4th HF switch, the resonance current of the secondary high-frequency circuit (21) is through the
The injection load of three HF switches.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11482938B2 (en) | 2019-09-12 | 2022-10-25 | Delta Electronics (Shanghai) Co., Ltd | Isolated resonant converter |
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| US6301128B1 (en) * | 2000-02-09 | 2001-10-09 | Delta Electronics, Inc. | Contactless electrical energy transmission system |
| CN102201739A (en) * | 2011-05-27 | 2011-09-28 | 华北电力大学（保定） | Symmetrical half-bridge LLC resonant bidirectional DC-DC converter |
| CN105932883A (en) * | 2016-06-03 | 2016-09-07 | 中南大学 | Power electronic transformer based on energy injection type direct AC-AC converter |
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2017
- 2017-01-23 CN CN201710058735.3A patent/CN106602882A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6301128B1 (en) * | 2000-02-09 | 2001-10-09 | Delta Electronics, Inc. | Contactless electrical energy transmission system |
| CN102201739A (en) * | 2011-05-27 | 2011-09-28 | 华北电力大学（保定） | Symmetrical half-bridge LLC resonant bidirectional DC-DC converter |
| CN105932883A (en) * | 2016-06-03 | 2016-09-07 | 中南大学 | Power electronic transformer based on energy injection type direct AC-AC converter |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11482938B2 (en) | 2019-09-12 | 2022-10-25 | Delta Electronics (Shanghai) Co., Ltd | Isolated resonant converter |
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