【摘要】：感應(yīng)加熱電源的工業(yè)發(fā)展趨勢(shì)是高頻化、高效率、體積小、數(shù)字智能化、控制精確化,研究開(kāi)發(fā)基于IGBT的感應(yīng)加熱電源已十分必要。本文以中頻感應(yīng)加熱電源為研究對(duì)象,以IGBT為主功率開(kāi)關(guān)器件,采用并聯(lián)型諧振逆變拓?fù)?完成2kHz/60kW并聯(lián)型中頻感應(yīng)加熱電源的設(shè)計(jì)。 本文首先對(duì)感應(yīng)加熱電源的發(fā)展現(xiàn)狀及前景作了分析,并闡述了感應(yīng)加熱的基本原理。從適用于大功率應(yīng)用場(chǎng)合的電流型并聯(lián)負(fù)載諧振逆變器出發(fā),對(duì)比了并聯(lián)諧振逆變器各種調(diào)功方式的優(yōu)缺點(diǎn),提出采用高頻Buck斬波器做為調(diào)節(jié)電源輸出功率的手段。文中重點(diǎn)對(duì)并聯(lián)諧振逆變器進(jìn)行分析,對(duì)比其各工作狀態(tài),指出為保證逆變器可靠運(yùn)行采用固定重疊角的控制策略,逆變器諧振負(fù)載工作在容性準(zhǔn)諧振狀態(tài)；采用基于DSP的數(shù)字鎖相、頻率自動(dòng)跟蹤控制策略,逆變器開(kāi)關(guān)頻率快速跟隨負(fù)載固有頻率的變化,諧振負(fù)載工作在所期望的弱容性準(zhǔn)諧振狀態(tài)。文中提出了一種精確計(jì)算輸出功率的方法,提高了電源的輸出控制精確度。 本文詳細(xì)闡述了并聯(lián)型感應(yīng)加熱電源的設(shè)計(jì)過(guò)程,分析了主電路的設(shè)計(jì)方法以及關(guān)鍵器件的選型,控制系統(tǒng)采用TI公司的TMS320LF2407A DSP作為控制核心,設(shè)計(jì)了一種可靠的運(yùn)行保護(hù)機(jī)制,并對(duì)電源的散熱系統(tǒng)進(jìn)行了仿真設(shè)計(jì)。在上述分析的基礎(chǔ)上,本文成功研制出了一臺(tái)功率為60kW的高性能的并聯(lián)型中頻感應(yīng)加熱電源。試驗(yàn)結(jié)果表明,該電源的電氣性能達(dá)到了預(yù)期的指標(biāo)要求,有利于提高感應(yīng)加熱熱場(chǎng)的穩(wěn)定性,有利于提高感應(yīng)加熱的諧振頻率。
[Abstract]:The industrial development trend of induction heating power supply is high frequency, high efficiency, small volume, digital intelligence and accurate control. It is necessary to develop induction heating power supply based on IGBT. In this paper, if induction heating power supply is taken as research object, IGBT as main power switch device and parallel resonant inverter topology adopted to complete the design of 2kHz/60kW parallel intermediate frequency induction heating power supply. In this paper, the present situation and prospect of induction heating power supply are analyzed, and the basic principle of induction heating is expounded. Starting from the current-mode parallel load resonant inverter suitable for high power applications, the advantages and disadvantages of various power regulation modes of parallel resonant inverter are compared, and a high frequency Buck chopper is proposed as a means to adjust the output power of the power supply. In this paper, the parallel resonant inverter is analyzed, and its working states are compared. It is pointed out that the resonant load of the inverter works in the capacitive quasi-resonant state in order to ensure the reliable operation of the inverter using the control strategy of fixed overlap angle. Digital phase-locking based on DSP and frequency automatic tracking control strategy are adopted. The switching frequency of inverter follows the change of natural frequency of load quickly. The resonant load works in the expected weak capacitive quasi-resonant state. In this paper, a method to calculate the output power accurately is presented, which improves the output control accuracy of the power supply. In this paper, the design process of parallel induction heating power supply is described in detail, and the design method of main circuit and the selection of key devices are analyzed. The control system adopts TMS320LF2407A DSP of TI Company as the control core, and designs a reliable operation protection mechanism. And the emulation design of the heat dissipation system of the power supply is carried out. Based on the above analysis, a high performance parallel intermediate frequency induction heating power supply with power of 60kW has been successfully developed. The experimental results show that the electrical performance of the power supply meets the expected requirements, which is conducive to improving the stability of the induction heating heat field and the resonant frequency of the induction heating.
【學(xué)位授予單位】：北京交通大學(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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