弧焊电源（国外英文资料）.docVIP

弧焊电源（国外英文资料） Definition: a direct current (DC) AC transformation between called inverter, realize the device is called a transformation, inverter, to provide electricity to the welding arc, and arc welding process required by the electrical performance of the inverter, known as the arc welding inverter. Particularity: arc welding inverter arc welding power supply is special load, especially the melting is extremely short circuit transition welding, inverter to dramatic changes under the dynamic load, working condition is very complex. Main components: power supply system; Electronic power system; Electronic control system; Given and feedback systems; Welding arc etc. The basic principle of arc welding inverter: In the power supply system, single phase or three phase power frequency communication network voltage, the input rectifier (URl) rectifier and filter (LC1) filter, a smooth dc voltage of inverter main circuit (single-phase rectifier is about 310 v or three-phase rectifier is about 520 v). The dc voltage in electrical power system integrated by inverter main circuit of high-power switch electronics (thyristor, transistors, field effect tube or IGBT) set of Q switch function, alternately into thousands of medium frequency high voltage to two hundred thousand Hertz, then through high frequency transformer (T) (in) fell to suitable for welding of dozens of v low voltage, and with the help of the electronic control system control drive circuit and a given and feedback circuit (M, N, G, etc), as well as the welding circuit impedance, receive the external characteristic and dynamic characteristic of arc welding process. If you need to direct current (dc) is adopted to improve the welding, but also needs the output rectifier U rectifier and the reactor L2, a filtering capacitor C2, the high (medium) frequency ac transformation become dc output. The variable flow process of arc welding inverter can be briefly described as: AC (AC) to direct current (DC) power frequenc