超高倍压耦合电感Boost变换器

Ultra-high Voltage Coupled Inductor Boost Converter

为提升、稳定新能源发电系统的输出电压,提出一种超高倍压耦合电感DC-DC变换器。采用耦合电路升压结构,使变换器增加新的增益调节单元;采用开关钳位结构,降低变换器开关器件的电压尖峰,吸收耦合电路的漏感能量,提高电压转换效率;对电路进行闭环控制,稳定变换器的输出电压;推演电路的工作模态和状态空间表达式,并与近几年典型的升压电路做比较。通过仿真和实验,分析电路在闭环控制下的稳态性能。研究结果表明:变换器可将18 V直流电稳定地提升到380 V,为提升新能源发电系统的输出电压奠定基础。

In order to improve and stabilize the output voltage of new energy power generation system,an ultra-high voltage coupled inductor DC-DC converter is proposed.A coupling circuit boost structure is adopted to add a new gain regulating unit to the converter.A switching clamp structure is used to reduce the voltage spike of the converter switching device,absorb the leakage inductance energy of the coupling circuit,and improve the voltage conversion efficiency.The circuit is controlled in a closed loop to stabilize the output voltage of the converter.The operating modes and state space expressions of the circuit are deduced and compared with typical boost circuits in recent years.The steady-state perfor-mance of the circuit under closed-loop control is analyzed by simulation and experiments.The results show that the converter can increase the low voltage of 18 V DC to the high voltage of 380 V stably,which lays a foundation for im-proving the output voltage of the new energy power generation system.