【摘要】：傳統(tǒng)的加熱方式是采用電阻一體化線圈來(lái)加熱物體，這種加熱方式具有能耗高、熱效率低、壽命短、工作環(huán)境差等缺點(diǎn)，而感應(yīng)加熱技術(shù)比起傳統(tǒng)的加熱方式優(yōu)點(diǎn)不言而喻。但如今在使用感應(yīng)加熱方式來(lái)加熱物體時(shí)，隨著溫度的升高，其負(fù)載線圈電感值隨之改變，所以感應(yīng)電源不能在其最佳工作點(diǎn)上工作，最后使電源失去諧振開(kāi)關(guān)的工作方式，同時(shí)頻率跟蹤和功率控制不能很好的結(jié)合，使快速性和準(zhǔn)確性不佳。如今感應(yīng)電源加熱工藝控制落后，不具備與上位機(jī)進(jìn)行通訊和監(jiān)測(cè)的能力，不能進(jìn)行在線控制和不能及時(shí)反映故障原因等。 鑒于此，本文研制一套以高性能MCU為核心的數(shù)字化頻率跟蹤感應(yīng)加熱電源，基于數(shù)控思想，搭建數(shù)字化人機(jī)交互系統(tǒng)，使電源可以在線調(diào)節(jié)電參數(shù)，修改電源功率，運(yùn)用高精度頻率跟蹤控制策略，實(shí)時(shí)跟蹤負(fù)載頻率，從而保證了電源的工作效率。同時(shí)設(shè)計(jì)了上位機(jī)通訊電路以及開(kāi)發(fā)基于Qt平臺(tái)上位機(jī)監(jiān)控軟件，方便對(duì)其實(shí)時(shí)觀察和控制。 本文以IGBT作為逆變功率開(kāi)關(guān)管，設(shè)計(jì)選擇串聯(lián)諧振逆變拓?fù)浣Y(jié)構(gòu)，搭建了中小功率感應(yīng)加熱電源。研制了頻率跟蹤控制系統(tǒng)采用PIC18F4520和CD4046為基本組成的數(shù)字和模擬相結(jié)合的閉環(huán)控制，研制并運(yùn)用了改進(jìn)型PFM功率控制策略，改善了電源加熱精度和工藝效果，使感應(yīng)加熱電源工作在弱感性模式下，從而提高了電源的可靠性。同時(shí)還增加了負(fù)載檢測(cè)、過(guò)流保護(hù)、過(guò)壓保護(hù)、過(guò)熱保護(hù)、驅(qū)動(dòng)、死區(qū)生成電路、人機(jī)交互等功能電路。在軟件設(shè)計(jì)方面，采用模塊化的編程方法，，使得控制軟件條理清晰，便于維護(hù)和升級(jí)。 最后，基于所設(shè)計(jì)的感應(yīng)加熱電源試驗(yàn)平臺(tái)，驗(yàn)證了改進(jìn)的PFM功率控制方式可以獲得良好的控制效果，頻率跟蹤控制系統(tǒng)達(dá)到了快速、準(zhǔn)確跟蹤頻率的要求，人機(jī)交互功能較好實(shí)現(xiàn)電源的在線控制。
[Abstract]:The traditional heating method is to use the resistance integrated coil to heat the object. This heating method has the disadvantages of high energy consumption, low thermal efficiency, short life, poor working environment, etc. The advantages of induction heating technology are self-evident compared with the traditional heating method. But now when using induction heating to heat objects, the inductance of the load coil changes with the increase of temperature, so the inductance of the induction power cannot work at its best working point, and finally the power source loses its resonant switch. At the same time, frequency tracking and power control can not be well combined, which makes the speed and accuracy poor. Nowadays, the heating process control of induction power supply is backward, and it does not have the ability to communicate and monitor with the upper computer, can not carry on the on-line control and can not reflect the fault cause in time, and so on. In view of this, a digital frequency tracking induction heating power supply based on high performance MCU is developed in this paper. Based on the idea of numerical control, a digital man-machine interactive system is built to make the power source adjust the electrical parameters and modify the power supply on line. The high precision frequency tracking control strategy is used to track the load frequency in real time, thus ensuring the efficiency of power supply. At the same time, the communication circuit of the host computer and the monitor software based on Qt platform are designed, which is convenient for real-time observation and control. In this paper, IGBT is used as the inverter power switch, the series resonant inverter topology is designed and the medium and small power induction heating power supply is built. A frequency tracking control system is developed, which combines digital and analog control with PIC18F4520 and CD4046. The improved PFM power control strategy is developed and applied to improve the heating accuracy and technological effect of the power supply. It makes the induction heating power working in the weak inductive mode, thus improving the reliability of the power supply. At the same time, load detection, overcurrent protection, overvoltage protection, overheating protection, drive, dead-zone generation circuit, man-machine interaction and other functional circuits are added. In software design, modular programming method is used to make the control software clear, easy to maintain and upgrade. Finally, based on the designed test platform of induction heating power supply, it is verified that the improved PFM power control method can obtain good control effect, and the frequency tracking control system achieves the requirement of fast and accurate tracking frequency. The function of man-machine interaction is better to realize the online control of power supply.
【學(xué)位授予單位】：哈爾濱理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2012
【分類(lèi)號(hào)】：TM919;TP368.1

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本文編號(hào)：2416125