双管正激型开关电源研制

Development of the Double Transistor Forward Switching Power Supply

介绍一种具有辅助谐振网络的双管正激变换器电路,主功率器件采用IGBT元件,由功率二极管、电感、电容组成的辅助谐振网络能改善IGBT的开关条件。详细分析了电路工作原理,给出了主要参数设计方法。设计了一台输出电压为48V、输出功率为1.5kW、工作频率为80kHz、谐振频率为350kHz的开关电源实验样机,在额定工作状态下效率达90.6%。该电路结构简单、成本低、工作频率高、效率高,与普通双管正激变换器相比有较高实用价值。

A double switch forward converter with aided resonant circuit is introduced,in which main power switches uses Insulated Gate Bipolar Transistor（IGBT）.The aided resonant circuit consisted of power diodes,inductor and capacitor can improve the switching state of the IGBT.The operating principle of this converter is analyzed in detail,the design considerations of key circuit parameters for the topology are introduced.An experimental prototype for 48V output voltage, 1.5kW output power, 80kHz operating frequency,and 350kHz resonant frequency has been successfully implemented by using this technology,and 90.6% operating efficiency is arrived at normality.The proposed converter has the features of circuit simple, lower cost, high efficiency and operating frequency, and is more useful than the conventional one.