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Introduction of High Power and High Voltage Power Supply for Electron Beam Welde
Source：http://brickdefender.comPublished time：2017-01-12 09:09:00Views：
Electron beam welding is widely used in aerospace, atomic energy, defense and military, automotive and electrical electrical instrumentation and many other industries because of its advantages of no electrode, easy oxidation, good process repeatability and small thermal deformation. The basic principle of electron beam welding is that the cathode in the electron gun emits electrons due to direct or indirect heating. The electron beam can be focused by the electromagnetic field under the acceleration of the high voltage electrostatic field and can form electron beam with high energy density. Workpiece, a huge kinetic energy into heat, welding parts melting, the formation of molten pool, in order to achieve the welding of the workpiece.
High voltage power supply is one of the key technologies of the equipment. It mainly supplies accelerating voltage for the electron gun. Its performance directly determines the electron beam welding process and the welding quality. Electron beam welder with high-voltage power supply and other types of high-voltage power supply has different technical characteristics, the technical requirements for the main ripple factor and stability, ripple factor requirements of less than 1%, stability of ± 1% Wave coefficient of less than 0.5%, the stability of ± 0.5%, while the repeatability requirements of less than 0.5%. The above requirements are based on the electron beam spot and the welding process. Electron beam welding machine with high-voltage power supply operation is to be linked with the relevant system protection, there are vacuum chain, cathode chain, gate valve chain, focusing chain, to ensure equipment and personal safety. High-voltage power supply must comply with EMC standards, with soft-start function, to prevent sudden power on the impact of closing.
This kind of power supply has high requirements for stability accuracy, ripple and voltage regulation rate because of its high power (up to 30kW), high output voltage (150kV) and high operating frequency (20kHz). Selection of advanced three-phase full-controlled rectifier technology, high-power high-frequency inverter, with a new power device IGBT as a power switch. Three-phase full controllable rectifier and inverter each adopt independent control board. IGBT drive adopts import thick film drive circuit, plus input filter and smoothing wave reactor and capacitor filter circuit. So that the power conversion part of the power supply has good technical advance and good power conversion.
High-voltage part: high-voltage transformer core using the latest amorphous materials, using a unique high-frequency high-voltage winding process, double high voltage transformer stack work. Advanced rectification and reasonable voltage doubler circuit and high-voltage equalization technology to ensure high-voltage power supply part of the high-voltage stable and reliable, high-voltage feedback signal and the use of precision divider from the high-voltage output directly sampling to ensure that the power supply has a high voltage regulator Accuracy, voltage regulation and accurate and reliable high-voltage measurement accuracy. The use of reasonable high-voltage filter technology to ensure good power supply ripple. The high-pressure part is placed in a fuel tank.
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