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一、次级整流点、焊缝机在国外,从七十年代起,大功率可控硅(额定电流2000—3600安)和硅整流管(额定电流2000—5000安)大批生产后,日本、美国、瑞士、法国和英国等电阻焊机生产厂都大力发展了使用大功率可控硅和硅整流元件、使用集成电路或微处理机控制电路的三相大功率的次级整流式电阻焊机。目前已有额定功率高达1000千伏安以上的点焊机、缝焊机,及表1、2列举的一些点、缝焊机。三相次级整流式电阻焊机的焊接变压器初级经可控硅元件接交流电源。如图1、2所示。由时间电路和移相调节电路控制这些可控硅导通的相位角和持续时间,经焊接变压器次级绕组产生二次交流电流。接入次级回路中的大功率硅整流管,将二次交流电流整流,其直流焊接电流波形如图3所示。
First, the secondary rectification point, welding machine in foreign countries, from the seventies, high-power thyristor (rated current 2000-3600 amps) and silicon rectifier (rated current 2000-5000 amps) mass production, Japan, Resistance welding machine manufacturers in the United States, Switzerland, France and the United Kingdom have all made great efforts to develop three-phase high-power secondary rectifier resistance welders that use high-power thyristors and silicon rectifiers and use integrated circuits or microprocessor control circuits . At present there have been rated power up to 1000 KVA spot welding machine, seam welding machine, and some of the points listed in Table 1,2, seam welding machine. The three-phase secondary rectifier welding resistance welding transformer primary SCR components connected to AC power. As shown in Figure 1,2. By the time circuit and phase-shift regulation circuit to control the conduction phase angle and duration of these SCRs, secondary windings of the welding transformer secondary AC current. Connected to the secondary loop of high-power silicon rectifier, the secondary AC current rectification, the DC welding current waveform shown in Figure 3.