CN102435856A - Method for measuring induction heating load inductance - Google Patents
Method for measuring induction heating load inductance Download PDFInfo
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- CN102435856A CN102435856A CN2011102590495A CN201110259049A CN102435856A CN 102435856 A CN102435856 A CN 102435856A CN 2011102590495 A CN2011102590495 A CN 2011102590495A CN 201110259049 A CN201110259049 A CN 201110259049A CN 102435856 A CN102435856 A CN 102435856A
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- induction heating
- load inductance
- voltage
- heating power
- inductance
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Abstract
The invention discloses a method for measuring induction heating load inductance, which comprises the following steps: calculating the complex impedance Z of an LC circuit according to acquired voltage U and current I; acquiring phase difference theta between fundamental components of output current and output voltage; calculating the load inductance L according to the complex impedance Z, the phase difference theta and capacitance C; and determining an induction heating power supply according to the load inductance L. The method for measuring the induction heating load inductance is capable of accurately and automatically measuring the load inductance, thereby, the induction heating power supply is determined, so that the induction heating power supply works under the best state, and the conditions that the service life of the induction heating power supply is shortened and the accidents such as machines explode and the like occur are avoided.
Description
Technical field
The present invention relates to automatic field of measurement, relate in particular to a kind of measuring method of induction heating load inductance.
Background technology
In the application of induction heating; Because load inductance amount and induction heating power that the client uses do not match; To making induction heating power not be operated in optimum condition; Cause reducing in induction heating power serviceable life even accident such as aircraft bombing occurs, therefore, in using induction heating power, need carry out a measurement external load inductance amount.In current induction heating is used, the measurement of external load inductance amount generally to pair function of load electrical measurement is also arranged in the induction heating power that has, but measuring accuracy be not high by the instrument and meter of surveying inductance value.
Summary of the invention
In view of the problems referred to above of prior art, the purpose of this invention is to provide a kind of measuring method of induction heating load inductance comparatively accurately.
To achieve these goals, the invention provides a kind of measuring method of induction heating load inductance, comprising:
S1 is according to the complex impedance Z of voltage U that obtains and electric current I calculating lc circuit;
S2 obtains the phase differential θ between output current and the fundamental voltage output of voltage component;
S3 is according to complex impedance Z, phase differential θ, capacitor C computational load inductance L;
S4 confirms induction heating power according to said load inductance L.
As preferably, the voltage U in the said S1 step is tried to achieve by voltage duty cycle and Fourier function.
As preferably, the electric current I in the said S1 step is tried to achieve by the Hall feedback.
As preferably, the phase differential θ in the said S2 step is tried to achieve by voltage width and output frequency.
The invention has the beneficial effects as follows: can comparatively accurately record load inductance automatically, thereby confirm induction heating power, make induction heating power be operated in optimum condition, avoid induction heating power to reduce serviceable life and accident such as aircraft bombing occurs.
Description of drawings
Fig. 1 is the process flow diagram of the measuring method of induction heating load inductance of the present invention.
Fig. 2 is the synoptic diagram that output voltage curve among the present invention, output current curve and fundamental voltage output of voltage are divided flow curve.
Fig. 3 is the graph of a relation of reactance, impedance and capacitive reactance among the present invention.
Embodiment
Specify embodiments of the invention below in conjunction with accompanying drawing.
As shown in Figure 1, the measuring method of induction heating load inductance of the present invention comprises:
S1 is according to the complex impedance Z of voltage U that obtains and electric current I calculating lc circuit;
S2 obtains the phase differential θ between output current and the fundamental voltage output of voltage component;
S3 is according to complex impedance Z, phase differential θ, capacitor C computational load inductance L;
S4 confirms induction heating power according to said load inductance L.
As preferably, the voltage U in the said S1 step is tried to achieve by voltage duty cycle and Fourier function.
As preferably, the electric current I in the said S1 step is tried to achieve by the Hall feedback.
As preferably, the phase differential θ in the said S2 step is tried to achieve by voltage width and output frequency.
As shown in Figures 2 and 3, can find out that there are phase differential θ in output current and fundamental voltage output of voltage component under lock phase situation.
Can know Z=U/I by the LC series resonant circuit, U can be tried to achieve by voltage duty cycle and Fourier function, and I is tried to achieve by the Hall feedback.
According to formula cot (θ)=R/ (X
L-X
C), can know that the θ angle can be tried to achieve by output frequency and voltage width, output frequency and voltage width all are known amount in the induction heating power program.
According to formula Z
2=(X
L-X
C)
2+ R
2, the LC resonant capacitance also is known amount, by the last inductance value that comprehensively can obtain external load.
According to measuring method of the present invention, can comparatively accurately record load inductance automatically, thereby confirm induction heating power, make induction heating power be operated in optimum condition, avoid induction heating power to reduce serviceable life and accident such as aircraft bombing occurs.
Reasoning process:
The effective value of voltage fundamental is U
Rms=4*U
D* COS θ/3.14 ... 1.
Resulting impedance R
z=U
Rms/ I
Rms2.
R
z 2＝R
x 2+R
2………………③
COTθ＝R/R
x………………④
R
x＝2*3.14*f*L-1/(2*3.14*f*C)……………⑤
By 1. 2. 3. 4. getting R
x=1.414*U
D* SIN (2 θ)/(3.14*I
Rms) ... 6.
By 1. 2. 3. 4. 5. getting inductance L=(R
x+ 1/ (2*3.14*f*C))/2*3.14*f
…………………⑦
(annotate: U in the following formula
RmsBe effective output voltage, I
RmsBe efficient output current, U
DBe bus
Voltage, R
zBe resulting impedance, R
xFor the impedance of inductance and electric capacity with, θ is the phasing degree)
Practical measuring examples:
Existing is example with the 50KW induction heating power, and resonant capacitance is 1uF, and the inductance value that load to be measured uses electric bridge to survey is 120uH.
Each parameter that machine shows during the induction heating power inductance measuring is following:
(1) output current effective value I
Rms=55A
(2) output frequency f=16.6KHZ
(3) output duty cycle D=0.79
Can release θ=180*0.21/2 by (3) and Fig. 2
By 6. getting R
x=1.414*U
D* SIN (2 θ)/(3.14*I
Rms)
＝1.414*510*0.324/(3.14*55)＝2.559
By 7. getting L=(R
x+ 1/ (2*3.14*f*C))/2*3.14*f
＝(2.559+1/(6.28*16.6*10
3*10
-6))/(6.28*16.6*10
3)
＝1.166*10
-4H＝116.6uH
Error is (120-116.6)/120*100=2.83%
Above embodiment is merely exemplary embodiment of the present invention, is not used in restriction the present invention, and protection scope of the present invention is defined by the claims.Those skilled in the art can make various modifications or be equal to replacement the present invention in essence of the present invention and protection domain, this modification or be equal to replacement and also should be regarded as dropping in protection scope of the present invention.
Claims (4)
1. the measuring method of an induction heating load inductance is characterized in that, comprising:
S1 is according to the complex impedance Z of voltage U that obtains and electric current I calculating lc circuit;
S2 obtains the phase differential θ between output current and the fundamental voltage output of voltage component;
S3 is according to complex impedance Z, phase differential θ, capacitor C computational load inductance L;
S4 confirms induction heating power according to said load inductance L.
2. the measuring method of induction heating load inductance according to claim 1 is characterized in that, the voltage U in the said S1 step is tried to achieve by voltage duty cycle and Fourier function.
3. the measuring method of induction heating load inductance according to claim 1 is characterized in that, the electric current I in the said S1 step is tried to achieve by the Hall feedback.
4. the measuring method of induction heating load inductance according to claim 1 is characterized in that, the phase differential θ in the said S2 step is tried to achieve by voltage width and output frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102590495A CN102435856A (en) | 2011-09-01 | 2011-09-01 | Method for measuring induction heating load inductance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102590495A CN102435856A (en) | 2011-09-01 | 2011-09-01 | Method for measuring induction heating load inductance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102435856A true CN102435856A (en) | 2012-05-02 |
Family
ID=45984009
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011102590495A Pending CN102435856A (en) | 2011-09-01 | 2011-09-01 | Method for measuring induction heating load inductance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102435856A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201063889Y (en) * | 2007-07-10 | 2008-05-21 | 湘潭科创机电有限公司 | Intermediate frequency power supply induction heater |
| CN101247680A (en) * | 2008-03-24 | 2008-08-20 | 俞正国 | Induction heating power supply circuit |
| CN101925208A (en) * | 2010-06-03 | 2010-12-22 | 湘潭科创机电有限公司 | Maximum power factor control method of intermediate frequency power supply induction heating apparatus |
-
2011
- 2011-09-01 CN CN2011102590495A patent/CN102435856A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201063889Y (en) * | 2007-07-10 | 2008-05-21 | 湘潭科创机电有限公司 | Intermediate frequency power supply induction heater |
| CN101247680A (en) * | 2008-03-24 | 2008-08-20 | 俞正国 | Induction heating power supply circuit |
| CN101925208A (en) * | 2010-06-03 | 2010-12-22 | 湘潭科创机电有限公司 | Maximum power factor control method of intermediate frequency power supply induction heating apparatus |
Non-Patent Citations (1)
| Title |
|---|
| SZWJN: "《交流电路元件参数的测定》", 20 February 2011 * |
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Application publication date: 20120502 |