CN109787500A - A kind of wide load domain system and its matching process for double E class inverters - Google Patents
A kind of wide load domain system and its matching process for double E class inverters Download PDFInfo
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- CN109787500A CN109787500A CN201910140572.2A CN201910140572A CN109787500A CN 109787500 A CN109787500 A CN 109787500A CN 201910140572 A CN201910140572 A CN 201910140572A CN 109787500 A CN109787500 A CN 109787500A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
A kind of wide load domain system and its matching process for double E class inverters disclosed by the invention increases the freedom degree of load tank circuit design using LLC resonant element is increased in inverter circuit；The equivalent transformation of load is realized by adjusting the ratio of matching inductance and equivalent inductance, realize impedance transformation, load equivalent is transformed in smaller range, double E class inverters are reduced to the sensitivity of load variation, Sofe Switch can be realized in broader loading range, meet the practical application request of induction heating power.
Description
Technical field
The invention belongs to induction heating technique field, be related to a kind of wide load domain system for double E class inverters and its
Matching process.
Background technique
The weak magnetic metal material such as aluminium, copper is widely used in induction heating apparatus, but the magnetic capacity of weak magnetic material
Close to air, it is big to heat difficulty.In order to improve heating efficiency, power volume is saved, the double E classes for generalling use the LC resonance tank circuit are inverse
Become device to improve the frequency of induction heating power, realizes circuit soft switch using resonance principle, reduce switching loss.
The range of double E class inverter zero voltage switch of the second order LC resonance tank circuit is relatively narrow, more quick for the variation of load
Sense, in actual sensed heating process the resistance of heating material can time to time change, the mismatch of load to circuit efficiency have compared with
Big influence.
Double E class inverters of three rank LLC resonant groove paths increase the freedom degree of the load resonant tank circuit, by adjusting matching electricity
Feel with the ratio of equivalent inductance and realize the equivalent transformation of load, load equivalent is transformed in smaller range, reduces Sofe Switch
To the sensitivity of load variation, meet the practical application request of induction heating power.
Summary of the invention
The purpose of the present invention is to provide a kind of wide load domain systems for double E class inverters, realize wide load model
Sofe Switch is enclosed, double E class inverter soft switchings is solved and sensitive issue is changed to load.
Another object of the present invention is to provide a kind of wide load domain matching process for double E class inverters, can be fast
Speed realizes wide loading range Sofe Switch matching.
The present invention use one technical solution to be: a kind of width for double E class inverters loads domain system, including straight
Flow input voltage source Uin, the DC input voitage source UinAnode be separately connected the first choke induction L1With the second choke induction
L2；The first choke induction L1It is separately connected first switch tube S1Drain electrode, first capacitor C1With one end of LLC resonant element；
The second choke induction L2Connect second switch S2Drain electrode and the second capacitor C2；The other end of the LLC resonant element point
Not with the second capacitor C2With the second switch S2Drain electrode connection；The first switch tube S1Source electrode, described first
Capacitor C1, the second capacitor C2With the second switch S2Source electrode with the DC input voitage source UinCathode connect
It connects.
The characteristics of present invention uses a technical solution also resides in,
LLC resonant element includes matching inductance Ls, matching inductance LsConnect equivalent inductance LrWith resonant capacitance Cr, equivalent electricity
Feel LrConnect load resistance r, load resistance r and the resonant capacitance CrConnection.
Matching inductance LsWith the first choke induction L1, first switch tube S1Drain electrode and first capacitor C1Connection；Load resistance
R and second switch S2Drain electrode and the second capacitor C2Connection；Resonant capacitance CrConnect second switch S2Drain electrode and second electricity
Hold C2Connection.
The technical solution of the invention for using another is:
A kind of matching process in the wide load domain for double E class inverters, comprising the following specific steps
Step 1, in resonance point ω0When, matching inductance L is calculated according to LLC resonant element equivalent changing methodsWith equivalent electricity
Feel LrRatio cc；
Step 2, the equivalent transformation between computational load resistance r and equivalent resistance R；Further according to outputting and inputting power-balance
Principle calculates the equivalent resistance of induction heating load；
Step 3, when load resistance r is optimal value roptWhen, load resistance roptGreater than equivalent resistance R, according in step 2
The equivalence changes relationship for calculating load resistance r and equivalent resistance R is ropt≥XLα/2 incude in conjunction with calculating in step 2
R >=r known to the equivalent resistance of heating loadopt, the equivalent resistance R of actual loading resistance value r increase, resonance circuit reduces, inverse
Sofe Switch can be realized by becoming device circuit,；
If r < roptWhen, matching inductance L should be adjusted according to LLC resonant element equivalent changing methodsWith equivalent inductance Lr's
Ratio cc relationship, makes it meet r >=ropt, inverter circuit realization Sofe Switch.
The characteristics of present invention uses another technical solution also resides in,
Equivalent transformation coefficient α is matching inductance L in step 1sWith equivalent inductance LrRatio:
Ls/Lr=α (1).
Equivalent transformation in step 2 between load resistance r and equivalent resistance R are as follows:
R/r≈α2 (10)
In formula, R is equivalent resistance, and r is load resistance, and α is equivalent transformation coefficient.
Basis outputs and inputs power-balance principle, the equivalent resistance of induction heating load in step 2 are as follows:
In formula, R is equivalent resistance, and L is equivalent inductance, XLFor the induction reactance of equivalent inductance L, α is equivalent transformation coefficient.
The beneficial effects of the present invention are: a kind of wide load domain system for double E class inverters of the invention, using inverse
Become in device circuit and increase LLC resonant element, increases the freedom degree of load tank circuit design；By adjust matching inductance with it is equivalent
The ratio of inductance realizes the equivalent transformation of load, realizes impedance transformation, load equivalent is transformed in smaller range, reduce
Double E class inverters can realize Sofe Switch, satisfaction is answered to the sensitivitys of load variation in broader loading range
The practical application request of heating power supply.
The matching process in a kind of wide load domain for double E class inverters of the invention, using the equivalent change of LLC resonant element
Method is changed, in conjunction with power-balance principle is output and input, impedance transformation is realized, load equivalent is transformed in smaller range, is subtracted
Small double E class inverters enable LLC resonant element to realize soft open in broader loading range the sensitivitys of load variation
It closes.
Detailed description of the invention
Fig. 1 is a kind of schematic diagram of the wide load domain system for double E class inverters of the present invention；
Fig. 2 is a kind of match curve figure of the wide load domain system matching process for double E class inverters of the present invention.
Specific embodiment
The following describes the present invention in detail with reference to the accompanying drawings and specific embodiments.
The present invention provides a kind of wide load domain systems for double E class inverters, as shown in Figure 1, including that direct current inputs
Voltage source Uin, DC input voitage source UinAnode be separately connected the first choke induction L1With the second choke induction L2；First grips
Galvanic electricity sense L1It is separately connected first switch tube S1Drain electrode, first capacitor C1With one end of LLC resonant element；Second choke induction
L2Connect second switch S2Drain electrode and the second capacitor C2；The other end of LLC resonant element respectively with the second capacitor C2With second
Switching tube S2Drain electrode connection；First switch tube S1Source electrode, first capacitor C1, the second capacitor C2With second switch S2Source electrode
With DC input voitage source UinCathode connection.
LLC resonant element includes matching inductance Ls, matching inductance LsConnect equivalent inductance LrWith resonant capacitance Cr, equivalent electricity
Feel LrConnect load resistance r, load resistance r and resonant capacitance CrConnection；
Matching inductance LsWith the first choke induction L1, first switch tube S1Drain electrode and first capacitor C1Connection；Load resistance
R and second switch S2Drain electrode and the second capacitor C2Connection；Resonant capacitance CrConnect second switch S2Drain electrode and second electricity
Hold C2Connection.
DC input voitage source UinInput direct-current voltage source passes through dc-battery or the direct current obtained by AC rectification
Electricity provides electric energy for system；First switch tube S1With second switch S2It is respectively load electricity with 50% duty ratio alternate conduction
Hinder r power supply, first switch tube S1With second switch S2MOSFET IGBT constant power pipe is selected, the voltage for needing to bear is
3.55 times of DC input voitage flows through first switch tube S1With second switch S2Electric current be respectively direct current input current
1.6 again；
First choke induction L1With the second choke induction L2To stablize input current, usual this first choke induction L1With
Second choke induction L2Inductance value it is sufficiently large so that output electric current be sine wave；
First capacitor C1With the second capacitor C2It is designed, is realized jointly with LLC resonant element soft according to actual loading situation
Switch.
A kind of matching process in the wide load domain for double E class inverters, implements according to step in detail below:
Step 1, in resonance point ω0When, matching inductance L is calculated according to LLC resonant element equivalent changing methodsWith equivalent electricity
Feel LrRatio cc, load resistance r is transformed to equivalent resistance R；
Step 2, the equivalent transformation between computational load resistance r and equivalent resistance R；Further according to outputting and inputting power-balance
Principle calculates the equivalent resistance of induction heating load；Load equivalent is transformed to smaller range to realize that impedance converts by purpose
It is interior, double E class inverters are reduced to the sensitivity of load variation, keep LLC resonant element real in broader loading range
Existing Sofe Switch；
Step 3, when load resistance r is optimal value roptWhen, load resistance roptGreater than equivalent resistance R, according in step 2
The equivalence changes relationship for calculating load resistance r and equivalent resistance R is ropt≥XLα/2 incude in conjunction with calculating in step 2
R >=r known to the equivalent resistance of heating loadopt, the equivalent resistance R of actual loading resistance value r increase, resonance circuit reduces, inverse
Sofe Switch can be realized by becoming device circuit, and inverter circuit whole efficiency is higher；
If r < roptWhen, by the way that inverter circuit is hard switching at this time known to resonance principle, biggish electric current point can be generated
Peak damages circuit devcie；Matching inductance L should be adjusted according to LLC resonant element equivalent changing methodsWith equivalent inductance LrRatio
Value α relationship, meets r >=ropt, inverter circuit realization Sofe Switch.
As shown in Fig. 2, load resistance r change when laod network equivalent resistance R and equivalent reactance X change curve.Load
The optimal value of resistance is ropt, the equivalent reactance of LLC resonant element is X, equivalent transformation factor alpha is adjusted, when meeting ropt≥X/α
When, with the increase of actual loading resistance value r, the equivalent resistance R of resonance circuit reduces.
In step 1, calculating equivalent transformation factor alpha is matching inductance LsWith equivalent inductance LrRatio cc formula are as follows:
Ls/Lr=α (1)
Wherein, first capacitor C1, the second capacitor C2Are as follows:
In formula, r is load resistance, and the π of ω=2 f is double E class inverters work angular frequencies；
First choke induction L1With the second choke induction L2Are as follows:
Resonant capacitance CrAre as follows:
In formula, f is double E class inverter working frequencies, and Q is inverter quality factor；
Q=ω0L/r (5)
In formula, ω0For resonance angular frequency, L LsLr/(Ls+Lr)。
In step 2, the equivalent transformation between the load resistance r and equivalent resistance R of LLC resonant element is calculated；
In resonance point ω0When, LLC tank circuit input impedance is
If LLC resonant element current gain is load current irWith inverter output current ioThe ratio between, it may be assumed that
In resonance point ω0When
When the quality factor of LLC resonant element are larger
According to outputting and inputting power-balance principle, the equivalent resistance of induction heating load is
R≈α2r (10)
When LLC resonant element works in resonance frequency, equivalent resistance R and equivalent inductive reactance X are respectively as follows:
To R derivation, and enable dR/dt=0 that can obtain:
Equivalent resistance R can be obtained by bringing formula (11) into are as follows:
When load resistance r is gradually increased, when Q tends to 0
X ≈ α ω L=α XL (14)
XLIt is the induction reactance of equivalent inductance L in formula.
It is designed by load matched, in [ropt, ∞] in the range of be able to satisfy when double E class inverters realize Sofe Switch pair
The requirement of load reduces the sensitivity that double E class inverters change load resistance, is suitable for loading during induction heating
The occasion that resistance will increase.
By the above-mentioned means, a kind of wide load domain system and its matching process for double E class inverters of the invention, is adopted
LLC resonant element is increased in inverter circuit, increases the freedom degree of load tank circuit design；By adjusting matching inductance
The equivalent transformation that load is realized with the ratio of equivalent inductance realizes impedance transformation, load equivalent is transformed to smaller range
It is interior, double E class inverters are reduced to the sensitivity of load variation, can realize Sofe Switch in broader loading range,
Meet the practical application request of induction heating power.
Claims (7)
1. a kind of wide load domain system for double E class inverters, which is characterized in that including DC input voitage source Uin, described
DC input voitage source UinAnode be separately connected the first choke induction L1With the second choke induction L2；First choke induction
L1It is separately connected first switch tube S1Drain electrode, first capacitor C1With one end of LLC resonant element；The second choke induction L2
Connect second switch S2Drain electrode and the second capacitor C2；The other end of the LLC resonant element respectively with the second capacitor C2
With the second switch S2Drain electrode connection；The first switch tube S1Source electrode, the first capacitor C1, it is described second electricity
Hold C2With the second switch S2Source electrode with the DC input voitage source UinCathode connection.
2. a kind of wide load domain system for double E class inverters as described in claim 1, which is characterized in that the LLC is humorous
The unit that shakes includes matching inductance Ls, the matching inductance LsConnect equivalent inductance LrWith resonant capacitance Cr, the equivalent inductance LrEven
Meet load resistance r, the load resistance r and the resonant capacitance CrConnection.
3. a kind of wide load domain system for double E class inverters as claimed in claim 2, which is characterized in that the matching
Inductance LsWith the first choke induction L1, the first switch tube S1Drain electrode and the first capacitor C1Connection；The load
The resistance r and second switch S2Drain electrode and the second capacitor C2Connection；The resonant capacitance CrDescribed second is connected to open
Close pipe S2Drain electrode and the second capacitor C2Connection.
4. a kind of matching process in wide load domain for double E class inverters as described in claims 1 to 3, including following tool
Body step:
Step 1, in resonance point ω0When, matching inductance L is calculated according to LLC resonant element equivalent changing methodsWith equivalent inductance Lr
Ratio cc；
Step 2, the equivalent transformation between computational load resistance r and equivalent resistance R；It is former further according to power-balance is output and input
Then, the equivalent resistance of induction heating load is calculated；
Step 3, when load resistance r is optimal value roptWhen, load resistance roptGreater than equivalent resistance R, calculated according in step 2
The equivalence changes relationship of load resistance r and equivalent resistance R is r outopt≥XLα/2, in conjunction with calculating induction heating in step 2
R >=r known to the equivalent resistance of loadopt, actual loading resistance value r increase, the equivalent resistance R reduction of resonance circuit, inverter
Circuit can realize Sofe Switch,；
If r < roptWhen, matching inductance L should be adjusted according to LLC resonant element equivalent changing methodsWith equivalent inductance LrRatio cc
Relationship makes it meet r >=ropt, inverter circuit realization Sofe Switch.
5. a kind of matching process in wide load domain for double E class inverters as claimed in claim 4, the step 1 are medium
Effect transformation coefficient α is matching inductance LsWith equivalent inductance LrRatio:
Ls/Lr=α (1).
6. a kind of matching process in wide load domain for double E class inverters as claimed in claim 4, born in the step 2
Carry the equivalent transformation between resistance r and equivalent resistance R are as follows:
R/r≈α2 (10)
In formula, R is equivalent resistance, and r is load resistance, and α is equivalent transformation coefficient.
7. a kind of matching process in wide load domain for double E class inverters as claimed in claim 4, root in the step 2
According to outputting and inputting power-balance principle, the equivalent resistance of induction heating load are as follows:
In formula, R is equivalent resistance, and L is equivalent inductance, XLFor the induction reactance of equivalent inductance L, α is equivalent transformation coefficient.
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| CN111682789A (en) * | 2020-05-20 | 2020-09-18 | 上海电机学院 | High-frequency double-E inverter system and method for wireless power transmission system |
| CN113364321A (en) * | 2021-06-10 | 2021-09-07 | 南京航空航天大学 | Direct-drive radio frequency plasma power supply |
| CN115589134A (en) * | 2022-10-08 | 2023-01-10 | 中南大学 | Cascading resonance driving structure of class-E inverter and design method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111682789A (en) * | 2020-05-20 | 2020-09-18 | 上海电机学院 | High-frequency double-E inverter system and method for wireless power transmission system |
| CN113364321A (en) * | 2021-06-10 | 2021-09-07 | 南京航空航天大学 | Direct-drive radio frequency plasma power supply |
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| CN115589134A (en) * | 2022-10-08 | 2023-01-10 | 中南大学 | Cascading resonance driving structure of class-E inverter and design method |
| CN115589134B (en) * | 2022-10-08 | 2023-05-23 | 中南大学 | E-type inverter cascade resonance driving structure and design method |
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Application publication date: 20190521 |