超宽输入电压范围准谐振反激式电源的设计.doc, No. 11
November 2011
超宽输入电压范围准谐振反激式电源的设计
郭津,马皓
(浙江大学,电气工程学院,浙江杭州310027)
播要:针对实际工业供电开关电源超宽输入电压范围要求,给出一款利用L6565实现超宽输入电压范国自适 应开关管关断时间准谐振反激式开关电源的设计与优化过程,其输入交流电压范围65765 V,提供12 V/500 mA, V/50 mA和36 V/50 mA 3路直流输出。实验结果表明,该电源具有输入电压范围宽、效率髙等优点,可应用 在超宽输入电压范围的电源中。
关竇词:幵关电源;趙宽输入电压范围;准漕振;自适应关断时间
中图分类号:TN86 文献标识码:A 文章编号:1000-100X(2011)11 -0023-03
Design of the Super Wide Input Voltage Range
Quasi-resonant Flyback Power Supply
GUO Jin, MA Hao
(Zhejiang University, Hangzhou 310027, China)
Abstract: Aiming at the requirement of super wide input voltage range of switching power supply used in the industrial applications, the design and optimization of a super wide input voltage range flyback power supply using 1-6565 are introduced,with self-adaptive off-time and quasi-resonant AC input line voltage range is 65-465 V(rms), providing three DC outputs of 12 V/500 mA, V/50 mA and 36 V/50 results indicate that the power supply has the advantages of super wide input voltage range and high can be used in the super wide input voltage range power supply・
Keywords:switching power supply; super wide input voltage range; quasi-resonant; self-adaptive off-time
1引言
反激式变换器具有成本低、体积小、易于实现 多路输出等吮点,因而被广泛应用在中小功率电 源中。一般的单相反激式开关电源的输入电压范 围只能满足于1:3的关系,即85-265 V叫但实际 工业供电系统往往要求供电电源具有更宽的输入 电压范围。准谐振反激式变换器虽然实现了软开 关,提高了效率,但由于变换器工作在变频状态, 当输入电压升高或负载变轻时开关
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