全负载范围零压零流软开关焊接逆变电源

Full-load range zero-voltage zero-current soft-switching inverter arc welding power supply

关键词:  零压零流软开关  辅助谐振网络  死区时间  全负载范围  焊接逆变电源

Key words:  zero-voltage zero-current soft-switching  auxiliary resonant network  dead time  full-load range  inverter arc welding power supply

摘要:

在对典型全桥软开关功率变换电路进行研究与分类的基础上,提出并设计分析了采用辅助谐振网络的全负载范围零压零流软开关全桥功率变换电路拓扑.通过采用死区时间自适应调节的移相控制方法,使移相控制的死区时间与受电路能量影响的谐振过程协调配合,实现了超前臂功率器件全负载范围的零压开通和效果良好的近似零压软关断.同时,针对全桥移相功率变换电路滞后臂软开通和软关断在全负载范围难以兼顾的问题,提出了零电压与零电流技术相结合的软开关实现方法,通过多种辅助措施的协调配合,实现了滞后臂功率器件全负载范围的零压开通和零压与零流相结合的软关断。

Abstract:

Depending on the research and classification of typical full-bridge soft-switching power converters, a full-load range zero-voltage zero-current soft-switching full-bridge power converter topology with auxiliary resonant network was put forward, designed and analyzed.By using dead time adaptive regulated phase-shift-control method, which makes the dead time conjugate with the resonance processes affected by the circuit energy, the full-load range zero-voltage turn-on and proximate zero-voltage soft turn-off with effective results are realized for the power devices of converter's lead leg.At the same time, aimed at the problem of soft turn-on and soft turn-off being difficult to be compatible in the full-load range for the power devices of converter's lag leg, a realizing method of soft-switching is proposed, which makes the zero-voltage and zero-current technology combined together.Through the cooperative function of various auxiliary measures, the full-load range zero-voltage turn-on, and soft turn-off combined zero-voltage with zero-current are realized for the power devices of converter's lag leg.