CN103747551A - Parallel resonance type three-time boost medium-frequency power supply - Google Patents
Parallel resonance type three-time boost medium-frequency power supply Download PDFInfo
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- CN103747551A CN103747551A CN201410020753.9A CN201410020753A CN103747551A CN 103747551 A CN103747551 A CN 103747551A CN 201410020753 A CN201410020753 A CN 201410020753A CN 103747551 A CN103747551 A CN 103747551A
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Abstract
The invention provides a parallel resonance type three-time boost medium-frequency power supply, which comprises four bridged thyristors, and a serial boost capacitor and a furnace induction coil are sequentially connected in series between the two output ends of the four bridged thyristors. The parallel resonance type three-time boost medium-frequency power supply is characterized in that: a parallel boost capacitor is connected in parallel between the serial boost capacitor and the furnace induction coil which are connected in series, and the capacitance of the parallel boost capacitor is higher than the capacitance of the serial boost capacitor. The parallel resonance type three-time boost medium-frequency power supply has the advantages of simple structure, excellent using effect, remarkable energy-saving effect, good current output effect and constant-power output, and the loss of the furnace induction coil is greatly reduced.
Description
Technical field
The present invention relates to induction heating equipment field, particularly relate to three intermediate frequency power supplies that boost of a kind of parallel resonance formula.
Background technology
Thyristor intermediate frequency power supply is the large capacity power source of one conventional on induction heating equipment.The thyristor intermediate frequency power supply of larger capacity adopts many thyristor parallel waies in inverter circuit more, because many Thyristors in series operations can cause insoluble technical problems such as turn-off time cooperation and dynamic voltage balancing in inverter circuit, and many thyristor parallel connections are easier than many Thyristors in series, but this has also caused and adopts the intermediate frequency power supply output voltage of many thyristor parallel waies to be all no more than 1000V.When this intermediate frequency power supply is for the large system of loaded quality factor Q value, such as melting load, the too low problem of frequency power output voltage has just caused very large difficulty, for reaching necessary bearing power, just must increase furnace induction coil electric current, furnace induction coil electric current is too large, must increase the conductor cross-section of oscillation circuit, and furnace induction coil electric current is too large, line loss is also just large, and pressure drop is larger.Therefore, industry wishes a kind of output voltage of intermediate frequency that neither improves inverter circuit, the voltage at the furnace induction coil two ends that can raise again, the thyristor intermediate frequency power supply of reduction furnace induction coil electric current.
Summary of the invention
The object of the invention is to overcome that traditional thyristor intermediate frequency power supply voltage is lower, electric current is large, large, the less economical weak point of line loss, provide a kind of furnace induction coil two ends that can raise on the basis of output voltage of intermediate frequency of not improving inverter circuit voltage, reduce furnace induction coil electric current, greatly reduce three intermediate frequency power supplies that boost of parallel resonance formula of furnace induction coil loss.
The object of the invention is to reach by following technical measures:
Three intermediate frequency power supplies that boost of parallel resonance formula, comprise four thyristors that bridge-type connects, between two outputs of four thyristors that bridge-type connects, be in series with successively series boosting capacitor and furnace induction coil, it is characterized in that: between the series boosting capacitor that is connected in series, furnace induction coil, be parallel with parallel connection boosting capacitor, the capacity of parallel connection boosting capacitor is greater than the capacity of series boosting capacitor.
As a kind of preferred version, the capacity of parallel connection boosting capacitor is the twice of series boosting condenser capacity.
Desirable furnace induction coil is pure inductance, in reality, furnace induction coil also has certain resistance, furnace induction coil is decomposed into the induction coil inductance L of pure inductance part in principle analysis below and induction coil resistance R two parts of active component are analyzed respectively, the series boosting capacitor Cs that is about to be connected in series and furnace induction coil are considered as series boosting capacitor Cs, furnace induction coil L, the series connection of induction coil resistance R, to facilitate boost principle analysis and data reckoning.The principle of boosting of the present invention: accompanying drawing 1 is intermediate frequency power supply illustraton of model, referring to accompanying drawing 1, the intermediate frequency output voltage between two outputs of four thyristor V1～V4 that bridge-type connects is Ua, output current is Ia; Electric current in series boosting capacitor Cs, furnace induction coil L, induction coil resistance R series circuit is IL, with electric current I, L makes reference vector, the voltage U cs on series boosting capacitor C s lags behind IL90 °, the leading IL90 ° of voltage U Ll on furnace induction coil L, voltage U R in induction coil resistance R and electric current I L homophase, hence one can see that, voltage in furnace induction coil L and induction coil resistance R is UL=ULl+UR, and the voltage between two outputs of the thyristor namely voltage on parallel connection boosting capacitor Cv is Ua=ULl+UR+Ucs; Inverter circuit output current Ia=IL+Icp, being ahead of Ua angle is Φ a (Φ a is power-factor angle).The angle of Ia and UL is θ.Accompanying drawing 2 is phasor diagram, and from accompanying drawing 2, series boosting capacitor Cs makes the amplitude of stove voltage U L more much bigger than voltage of intermediate frequency Ua, and phase place approaches homophase; IL > Ia, Icp > Ia, and IL ≈ Icp,
UL≈Ua+Ucs
≈-Ua+{IL×(1／Cs)}／{Icp×(1／Cp)}×Ua
=Ua+(Cp／Cs)×Ua=Ua(1+Cp／Cs)
={(Cs+Cp)／Cs}×Ua
When parallel connection boosting electric capacity equals series boosting electric capacity twice, during Cp=2Cs, above formula UL ≈ 3Ua, the voltage in furnace induction coil is about 3 times of medium frequency inverter circuit output voltage in other words, reaches three objects of boosting of parallel resonance.In practical application test, intermediate frequency power supply electric current output effect disclosed by the invention is good, can constant power output, greatly reduce the loss of induction coil.
Owing to having adopted technique scheme, compared with prior art, advantage of the present invention is:
The invention discloses three intermediate frequency power supplies that boost of a kind of parallel resonance formula, have simple in structure, result of use is good, the obvious advantage of energy conservation and consumption reduction effects, electric current output effect is good, can constant power output, greatly reduce the loss of furnace induction coil.
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
Accompanying drawing explanation
Accompanying drawing 1 is the intermediate frequency power supply illustraton of model of three intermediate frequency power supplies that boost of parallel resonance formula of the present invention;
Accompanying drawing 2 is phasor diagrams of three intermediate frequency power supplies that boost of parallel resonance formula of the present invention.
Embodiment
Embodiment: as shown in Figures 1 and 2, three intermediate frequency power supplies that boost of parallel resonance formula, comprise four thyristor V1～V4 that bridge-type connects, between two outputs of four thyristor V1～V4 that bridge-type connects, be in series with successively series boosting capacitor Cs and furnace induction coil, between the series boosting capacitor Cs that is connected in series, furnace induction coil, be parallel with parallel connection boosting capacitor Cp, the capacity of parallel connection boosting capacitor Cp is greater than the capacity of series boosting capacitor Cs.In the present embodiment, the capacity of parallel connection boosting capacitor Cp is the twice of series boosting capacitor Cs capacity.
In accompanying drawing 1, furnace induction coil is divided into the induction coil inductance L of pure inductance part and induction coil resistance R two parts of active component draw respectively, conveniently analyze, the series boosting capacitor Cs that is about to be connected in series and furnace induction coil are considered as series boosting capacitor Cs, furnace induction coil L, the series connection of induction coil resistance R, to facilitate boost principle analysis and data reckoning.The principle of boosting of the present invention: accompanying drawing 1 is intermediate frequency power supply illustraton of model, referring to accompanying drawing 1, the intermediate frequency output voltage between two outputs of four thyristor Vl～V4 that bridge-type connects is Ua, output current is Ia; Electric current in series boosting capacitor Cs, furnace induction coil L, induction coil resistance R series circuit is IL, with electric current I, L makes reference vector, the voltage U cs on series boosting capacitor C s lags behind IL90 °, referring to accompanying drawing 2, the leading IL90 ° of voltage U Ll on furnace induction coil L, voltage U R in induction coil resistance R and electric current I L homophase, hence one can see that, voltage in furnace induction coil L and induction coil resistance R is UL=ULl+UR, and the voltage between two outputs of the thyristor namely voltage on parallel connection boosting capacitor Cp is Ua=ULl+UR+Ucs; Inverter circuit output current Ia=IL+Icp, being ahead of Ua angle is Φ a (Φ a is power-factor angle).The angle of Ia and UL is θ.Accompanying drawing 2 is phasor diagram, and from accompanying drawing 2, series boosting capacitor Cs makes the amplitude of stove voltage U L more much bigger than voltage of intermediate frequency Ua, and phase place approaches homophase; IL>Ia, Icp>Ia, and IL ≈ Icp,
UL≈Ua+Ucs
≈Ua+{IL×(I／Cs)}／{Icp×(1／Cp)}×Ua
=Ua+(Cp／Cs)×Ua=Ua(1+Cp／Cs)
={(Cs+Cp)／Cs}×Ua
When parallel connection boosting electric capacity equals series boosting electric capacity twice, during Cp=2Cs, above formula UL ≈ 3Ua, the voltage in furnace induction coil is about 3 times of medium frequency inverter circuit output voltage in other words, reaches three objects of boosting of parallel resonance.
In the present embodiment, it is 1696uF electric capacity that Cs selects capacity, and it is 884uF electric capacity that Cp selects capacity, and the above-mentioned principle calculating formula of substitution is known:
UL={(Cs+Cp)／Cs}×Ua
={(1696+884)／884}×Ua
=2.9×Ua
≈3Ua
In practical application test, intermediate frequency power supply electric current output effect disclosed by the invention is good, can constant power output, greatly reduce the loss of induction coil.
Claims (2)
1. three intermediate frequency power supplies that boost of parallel resonance formula, comprise four thyristors that bridge-type connects, between two outputs of four thyristors that bridge-type connects, be in series with successively series boosting capacitor and furnace induction coil, it is characterized in that: between the series boosting capacitor that is connected in series, furnace induction coil, be parallel with parallel connection boosting capacitor, the capacity of parallel connection boosting capacitor is greater than the capacity of series boosting capacitor.
2. three intermediate frequency power supplies that boost of parallel resonance formula according to claim 1, is characterized in that: the capacity of parallel connection boosting capacitor is the twice of series boosting condenser capacity.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410020753.9A CN103747551A (en) | 2014-01-12 | 2014-01-12 | Parallel resonance type three-time boost medium-frequency power supply |
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| CN201410020753.9A CN103747551A (en) | 2014-01-12 | 2014-01-12 | Parallel resonance type three-time boost medium-frequency power supply |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2308218Y (en) * | 1997-05-01 | 1999-02-17 | 王钟秀 | Bypass inductance device for intemediate-frequency booster electric induction furnace |
| US6163019A (en) * | 1999-03-05 | 2000-12-19 | Abb Metallurgy | Resonant frequency induction furnace system using capacitive voltage division |
| CN2814872Y (en) * | 2005-07-28 | 2006-09-06 | 西安博大电炉有限公司 | Medium frequency inductive heating power regulator |
| JP2012018807A (en) * | 2010-07-07 | 2012-01-26 | Sinfonia Technology Co Ltd | Induction heating power source and induction heating device |
-
2014
- 2014-01-12 CN CN201410020753.9A patent/CN103747551A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2308218Y (en) * | 1997-05-01 | 1999-02-17 | 王钟秀 | Bypass inductance device for intemediate-frequency booster electric induction furnace |
| US6163019A (en) * | 1999-03-05 | 2000-12-19 | Abb Metallurgy | Resonant frequency induction furnace system using capacitive voltage division |
| CN2814872Y (en) * | 2005-07-28 | 2006-09-06 | 西安博大电炉有限公司 | Medium frequency inductive heating power regulator |
| JP2012018807A (en) * | 2010-07-07 | 2012-01-26 | Sinfonia Technology Co Ltd | Induction heating power source and induction heating device |
Non-Patent Citations (1)
| Title |
|---|
| 席文娣: "中频电炉节能原理与方法的研究", 《中国优秀硕士学位论文全文数据库工程科技Ⅱ辑》 * |
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Application publication date: 20140423 |