基于LC谐振变换器的电子束焊机高压电源

High-voltage power supply for electronic beam welder based on LC resonant converter

针对传统电子束焊机高压电源频率低,变压器体积、质量大的问题,利用LC谐振变换器,实现功率管的软开关,提高逆变器电路的工作频率,达到减少变压器体积、质量的目的。软开关技术避免了功率管在高速开通、关断下产生的谐波,并减少开关损耗。分析LC谐振变换器的工作原理,采用BUCK电路调节母线电压的方式,避免LC谐振变换器在负载较轻调频很难改变电压的缺点。通过调试电子束焊机高压电源,分析试验参数,验证设计的合理性。

In view of the problems that the low frequency of high-voltage power supply for traditional electronic beam welder and large volume and weight of transformer,the LC resonant converter is used to realize the soft switch of the power tube,improve the working frequency of the inverter circuit,to reduce the volume and weight of transformer. Soft switch technology is also utilized to avoid the harmonic and to reduce the switching loss when the power tube opens and shuts off under high speed. The working principle of LC resonant converter is also analyzed. The fault that the voltage is hard to change by FM in lighter load is avoided using BUCK circuit to adjust busbar voltages. By adjusting the high voltage power supply of the electron beam welding machine,the test parameters are analyzed, and the rationality of the design is verified.