CN209676141U - A kind of wide load domain system for double E class inverters - Google Patents
A kind of wide load domain system for double E class inverters Download PDFInfo
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- CN209676141U CN209676141U CN201920240059.6U CN201920240059U CN209676141U CN 209676141 U CN209676141 U CN 209676141U CN 201920240059 U CN201920240059 U CN 201920240059U CN 209676141 U CN209676141 U CN 209676141U
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Abstract
A kind of wide load domain system for double E class inverters disclosed by the utility model, including DC input voitage 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 respectively with the second capacitor C2With the second switch S2Drain electrode connection；The first switch tube S1Source electrode, the first capacitor C1, the second capacitor C2With the second switch S2Source electrode with the DC input voitage source UinCathode connection.LLC resonant element is increased in circuit, is realized impedance transformation, can be realized Sofe Switch in broader loading range.
Description
Technical field
The utility model belongs to induction heating technique field, is related to a kind of wide load domain system for double E class inverters.
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 this utility model is to provide a kind of wide load domain systems for double E class inverters, realize wider
Sofe Switch in loading range solves double E class inverter soft switchings and changes sensitive issue to load.
The utility model uses one technical solution to be: a kind of wide load domain system for double E class inverters, packet
Include DC input voitage source Uin, the DC input voitage source UinAnode be separately connected the first choke induction L1With the second chokes
Inductance L2；First choke induction 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 is respectively with second
Capacitor C2With second switch S2Drain electrode connection；First switch tube S1Source electrode, first capacitor C1, the second capacitor C2It is opened with second
Close pipe S2Source electrode with DC input voitage source UinCathode connection.
The utility model uses the characteristics of technical solution to also reside 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 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 beneficial effects of the utility model are: a kind of wide load domain system for double E class inverters of the utility model,
Using LLC resonant element is increased in inverter circuit, the freedom degree of load tank circuit design is increased；By adjusting matching electricity
Feel with the ratio of equivalent inductance and realize the equivalent transformation of load, realizes impedance transformation, load equivalent is transformed into smaller model
In enclosing, double E class inverters are reduced to the sensitivity of load variation, soft open can be realized in broader loading range
It closes, meets the practical application request of induction heating power.
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 utility model；
Fig. 2 is a kind of match curve figure of the wide load domain system matching process for double E class inverters of the utility model.
Specific embodiment
The utility model is described in detail with reference to the accompanying drawings and detailed description.
The utility model provides a kind of wide load domain system for double E class inverters, as shown in Figure 1, including direct current
Input voltage source Uin, DC input voitage source UinAnode be separately connected the first choke induction L1With the second choke induction L2；The
One choke induction L1It is separately connected first switch tube S1Drain electrode, first capacitor C1With one end of LLC resonant element；Second chokes
Inductance L2Connect second switch S2Drain electrode and the second capacitor C2；The other end of LLC resonant element respectively with the second capacitor C2With
Second switch S2Drain electrode connection；First switch tube S1Source electrode, first capacitor C1, the second capacitor C2With second switch S2's
Source 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 hereby achieved that the change curve of laod network equivalent resistance R and equivalent reactance X is as schemed when load resistance r changes
2.The optimal value of load resistance is ropt, the equivalent reactance of LLC resonant element is X, equivalent transformation factor alpha is adjusted, when meeting ropt
When >=X/ α, with the increase of actual loading resistance value r, the equivalent resistance R of resonance circuit reduces.
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 for double E class inverters of the utility model, using in inversion
LLC resonant element is increased in device circuit, increases the freedom degree of load tank circuit design；By adjusting matching inductance and equivalent electricity
The ratio of sense realizes the equivalent transformation of load, realizes impedance transformation, load equivalent is transformed in smaller range, is reduced
Double E class inverters can realize Sofe Switch, satisfaction should add to the sensitivity of load variation in broader loading range
The practical application request of thermoelectric generator.
Claims (3)
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.
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| CN201920240059.6U CN209676141U (en) | 2019-02-26 | 2019-02-26 | A kind of wide load domain system for double E class inverters |
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| CN201920240059.6U CN209676141U (en) | 2019-02-26 | 2019-02-26 | A kind of wide load domain system for double E class inverters |
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| CN209676141U true CN209676141U (en) | 2019-11-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109787500A (en) * | 2019-02-26 | 2019-05-21 | 西安理工大学 | A kind of wide load domain system and its matching process for double E class inverters |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109787500A (en) * | 2019-02-26 | 2019-05-21 | 西安理工大学 | A kind of wide load domain system and its matching process for double E class inverters |
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