【摘要】：感應(yīng)加熱技術(shù)就是利用電磁感應(yīng)原理，在螺線管中通入交變的電流，從而產(chǎn)生交變磁場(chǎng)，通過工件切割磁場(chǎng)產(chǎn)生渦流，再利用工件自身的電阻發(fā)熱，來達(dá)到加熱效果的。感應(yīng)加熱電源具有對(duì)金屬材料加熱效率最高、速度最快，且低耗環(huán)保的優(yōu)點(diǎn)。此外，感應(yīng)加熱電源還容易實(shí)現(xiàn)對(duì)溫度的控制，作業(yè)環(huán)境好，能加熱復(fù)雜形狀的工件，因此，感應(yīng)加熱電源已經(jīng)成為我國(guó)研究的熱點(diǎn)問題。 目前，可控硅中頻感應(yīng)加熱電源存在一些問題，如電源功率因數(shù)低、啟動(dòng)困難、啟動(dòng)成功率低、功率調(diào)節(jié)有限、控制系統(tǒng)復(fù)雜等。對(duì)于功率調(diào)節(jié)和控制系統(tǒng)復(fù)雜的問題，制定了DSP和FPGA聯(lián)合控制的解決方案，使得中頻電源的控制更加智能化。對(duì)于電源功率因數(shù)低的缺點(diǎn)，設(shè)計(jì)了數(shù)字鎖相環(huán)，采用定角控制，能夠把電源的逆變角控制在一個(gè)很小的范圍內(nèi)，提高電源的功率因數(shù)。對(duì)于可控硅中頻電源的啟動(dòng)問題，采用了輔助啟動(dòng)加掃頻的啟動(dòng)方式，實(shí)現(xiàn)它激振蕩轉(zhuǎn)自激振蕩，使得可控硅中頻電源的啟動(dòng)成功率上升到99%。 本課題針對(duì)原有傳統(tǒng)模擬300KW并聯(lián)諧振型中頻感應(yīng)加熱電源，分析其負(fù)載特性，電源工作過程以及調(diào)功控制方式，然后，在此基礎(chǔ)上運(yùn)用DSP和FPGA芯片進(jìn)行數(shù)字化的中頻感應(yīng)加熱電源的改造。其中重點(diǎn)分析了傳統(tǒng)模擬電源的控制策略和調(diào)功方式，實(shí)現(xiàn)了相序自適應(yīng)的可控硅移相全橋控制模式。并深入分析了電源在加熱過程中的負(fù)載特性，實(shí)現(xiàn)了逆變角定角控制和大范圍的頻率跟蹤。同時(shí)針對(duì)其調(diào)功方式的不同，本課題設(shè)計(jì)了兩種控制策略，，達(dá)到傳統(tǒng)電源無法達(dá)到的效果。接著，分析了電源啟動(dòng)的問題，設(shè)計(jì)了輔助啟動(dòng)加掃頻的啟動(dòng)方式。最后，進(jìn)行了上機(jī)調(diào)試和帶載實(shí)驗(yàn)，測(cè)量了電路工作時(shí)的相關(guān)波形。
[Abstract]:Induction heating technology is to use the electromagnetic induction principle, in the solenoid into the alternating current, so as to produce an alternating magnetic field, through the cutting magnetic field of the workpiece to generate eddy current, and then use the workpiece's own resistance to heat, to achieve the heating effect. Induction heating power supply has the advantages of the highest heating efficiency, the fastest speed and low consumption of environmental protection. In addition, the induction heating power supply is easy to control the temperature, the working environment is good, and it can heat the workpiece with complex shape. Therefore, the induction heating power supply has become a hot issue in our country. At present, there are some problems in thyristor medium frequency induction heating power supply, such as low power factor, difficult start-up, low success rate, limited power regulation, complex control system and so on. For the complex problem of power regulation and control system, the solution of DSP and FPGA joint control is developed, which makes the control of if power supply more intelligent. For the shortcoming of low power factor, a digital phase-locked loop is designed, which can control the inverter angle of the power source in a small range and improve the power factor of the power supply. For the start up of thyristor if power supply, the auxiliary start and sweep mode is adopted to realize its oscillation to self-excited oscillation, and the success rate of thyristor intermediate frequency power supply is increased to 99%. This topic aims at the traditional analog 300KW parallel resonant medium frequency induction heating power supply, analyzes its load characteristic, power supply working process and power regulation control mode, then, On this basis, DSP and FPGA chips are used to transform the digital if induction heating power supply. The control strategy and power regulation mode of the traditional analog power supply are analyzed, and the phase-sequence adaptive phase-shift full-bridge control mode is realized. The load characteristics of the power supply during heating are analyzed, and the inverter angle control and wide range frequency tracking are realized. At the same time, two control strategies are designed to achieve the effect that the traditional power supply can not achieve. Then, the problem of power supply startup is analyzed, and the starting mode of auxiliary start-up is designed. Finally, debugging and loading experiments are carried out, and the relevant waveforms of the circuit are measured.
【學(xué)位授予單位】：北京工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM924.01

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