本文關(guān)鍵詞： 電阻焊電源 FPGA 恒流控制 2SD315A驅(qū)動(dòng)模塊 Simulink　出處：《河北大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：目前市場上的電阻焊電源主要以單片機(jī)、DSP芯片為控制核心,且工作頻率一般都在1kHz~2kHz。由于電阻焊具有焊接電流大、焊接時(shí)間短等特殊的工藝特點(diǎn),同時(shí)為了滿足工業(yè)自動(dòng)化生產(chǎn)對焊接工藝和焊接質(zhì)量的更高要求,對電阻焊電源的控制提出了新的要求,要求其過程控制更加穩(wěn)定可靠、焊接能量能夠高精度的控制。因此本文選用了實(shí)時(shí)性和控制精度相比單片機(jī)、DSP都要好的FPGA芯片作為控制核心對電阻焊電源進(jìn)行了研究與設(shè)計(jì)。為了獲得控制精度高、實(shí)時(shí)性好的控制效果,本文充分運(yùn)用FPGA并行架構(gòu)的特點(diǎn)對電源的恒流控制器的各個(gè)功能模塊進(jìn)行了設(shè)計(jì),特別是對數(shù)字PID進(jìn)行了改進(jìn),以及避免電源啟動(dòng)和不同電流值間進(jìn)行切換時(shí)的電流沖擊,設(shè)計(jì)了軟切換模塊。應(yīng)用模塊化的設(shè)計(jì)思想將電源控制的各個(gè)功能模塊都以數(shù)字電路的形式集成于芯片中,有效的提高了控制器的抗干擾能力。同時(shí)本文還詳細(xì)的分析了電阻焊的基本原理及焊接工藝。然后確定了電源的整體設(shè)計(jì)方案,對主電路進(jìn)行了分析和設(shè)計(jì),以及對關(guān)鍵元器件進(jìn)行了選型和參數(shù)的確定。最后基于2SD315A模塊對大功率IGBT的驅(qū)動(dòng)電路進(jìn)行了研究與設(shè)計(jì)。另外為了保證整個(gè)系統(tǒng)安全可靠的運(yùn)行,本文還設(shè)計(jì)了電源保護(hù)電路、電流反饋電路等,以及對改善驅(qū)動(dòng)效果的不對稱柵極電路進(jìn)行了分析和設(shè)計(jì)。最后,在不同負(fù)載的條件下,對設(shè)計(jì)的恒流控制器在Modesim中進(jìn)行了時(shí)序仿真,仿真結(jié)果達(dá)到預(yù)期的設(shè)計(jì)目的。對功率IGBT的驅(qū)動(dòng)脈沖進(jìn)行了實(shí)驗(yàn)測試,測試結(jié)果表明該驅(qū)動(dòng)脈沖能可靠驅(qū)動(dòng)IGBT。同時(shí)在空載的條件下,對變壓器進(jìn)行了實(shí)驗(yàn)測試,測試結(jié)果良好。并在Matlab的Simulink中對電源的各個(gè)功能模塊進(jìn)行仿真測試,仿真結(jié)果進(jìn)一步檢驗(yàn)了設(shè)計(jì)的可靠性。
[Abstract]:At present, the main control core of resistance welding power source in the market is single chip microcomputer DSP chip, and the working frequency is generally in 1 kHz or 2 kHz. Because resistance welding has special technological characteristics, such as large welding current and short welding time, etc. At the same time, in order to meet the higher requirements of welding process and welding quality in industrial automation production, a new requirement for the control of resistance welding power source is put forward, which requires the process control to be more stable and reliable. The welding energy can be controlled with high precision. Therefore, FPGA chip, which has better real-time and control precision than single-chip microcomputer, is used as the control core to study and design the resistance welding power source. This paper makes full use of the characteristics of FPGA parallel architecture to design each functional module of constant current controller of power supply, especially the improvement of digital PID. The soft switching module is designed by avoiding the current shock when the power supply is started and switching between different current values. The function modules of the power supply control are integrated into the chip in the form of digital circuit by using the modular design idea. At the same time, the basic principle and welding process of resistance welding are analyzed in detail. Then, the overall design scheme of power supply is determined, and the main circuit is analyzed and designed. Finally, based on 2SD315A module, the driving circuit of high-power IGBT is studied and designed. In addition, in order to ensure the safe and reliable operation of the whole system, the power supply protection circuit is designed. The current feedback circuit and the asymmetric gate circuit to improve the driving effect are analyzed and designed. Finally, the timing simulation of the designed constant current controller in Modesim is carried out under different load conditions. The experimental results show that the driving pulse can drive the IGBT reliably. At the same time, the transformer is tested under the condition of no load. The test results are good, and the simulation test of each function module of power supply is carried out in the Simulink of Matlab. The simulation results further verify the reliability of the design.
【學(xué)位授予單位】：河北大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN86;TN791

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