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半桥式开关稳压电源.doc

发布:2017-11-23约2.55万字共38页下载文档
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摘 要 半桥式变换器作为一种功率变换,目前在电力电子及理论电工的研究领域中,涵盖了电力电子、理论电工及控制理论中的众多内容。半桥式PWM开关稳压电源基本工作原理就是在输入电压变化、内部参数变化、外接负载变化的情况下,控制电路通过被控制信号与基准信号的差值进行闭环反馈,调节主电路开关器件的导通脉冲宽度,使得开关电源的输出电压或电流等被控制信号稳定。 半桥式PWM的开关频率一般为恒定,控制取样信号有:输出电压、输入电压、输出电流 、输出电感电压、开关器件峰值电流。由这些信号可以构成单环、双环或多环反馈系统 ,实现稳压、稳流及恒定功率的目的,同时可以实现一些附带的过流保护、过压保护等功能。 关键词:半桥式变换器,PWM,开关,反馈 ABSTRACT The semi-bridge system converter takes one kind of power transformation, at present in electric power electron and in theory electricians research area,Has covered the electric power electron, the theory electrician and in the control theory multitudinous content. The semi-bridge system PWM switch voltage-stabilized source basic principle of work is in the input voltage change, internal parameter change, outside meets the variation of load in the situation, the control circuit through is controlled the signal and the datum signal interpolation carries on the closed loop feedback, adjusts the main circuit switchcomponent to lead passes the pulse width, causes the switching power supply the output voltage or the electric current and so on is controlled the signal to be stable. The semi-bridge system PWM turn-on frequency for is generally constant, the control sample signal includes: Output voltage, input voltage, output current, output inductance voltage, switch component peak value electric current. May constitute Shan Huan, Shuanghuan or the multi- links feedback system by these signals, the realization constant voltage, the stationary stream and the constant power goal, at the same time may realize some supplementaries to flow function and so on protection, overvoltage protection. Key word: Semi-bridge system converter,PWM,switch,Feedback 目 录 摘要……………………………………………………………………………….I 绪论……………………………………………………………………………….1 第1章 概述………………………………………………………………….3 1.1 引言……………………………………………………………………….3 1.1.1 什么是开关变换器和开关电源…………………………………3 1.2 开关变换器所使用的元件及其特性……………………………………....4 1.2.1 开关………………………………………………………………4 1.2.2 电感……………………………………………………………..4 1.2.3 电容……………
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