摘要
在電子技術(shù)發(fā)展的越來越快的今天，許多設(shè)備對電源的要求越來越嚴格，本文從D類放大器的應(yīng)用出發(fā)，結(jié)合模擬電子技術(shù)從元器件、電路拓撲結(jié)構(gòu)和電路結(jié)構(gòu)等方面分析開關(guān)電源的工作原理，并從開關(guān)電源的主要元器件D類放大器出發(fā)，分析了D類放大器的工作原理；電壓信號的放大技術(shù)，以及用555定時器設(shè)計施密特觸發(fā)器整形濾波，全面的分析了開關(guān)電源實現(xiàn)的原理、可靠性，元器件對電路產(chǎn)生干擾，討論其對電網(wǎng)產(chǎn)生的危害；在討論開關(guān)電源產(chǎn)生電磁干擾原因之后提出了相對應(yīng)的一些常用的抑制措施，諸如電氣隔離技術(shù)、接地技術(shù)、濾波技術(shù)等等。
關(guān)鍵詞:開關(guān)電源；D類放大器；可靠性設(shè)計；抑制措施；隔離技術(shù)

Abstract:
AT the morden days with the electrinic technology fast development , it is strict to power Supply in the many equipment’ using This paper analyzes the mechanism of electromagnetic disturbance in switching-mode power supply from the three aspects such as the component, the structure of circuit, the topology destruct of circuit according to the theory of electromagnetic and deduces the used of Classed D and power amplifiers of the switching mode power supply. And we analyze the reason that the two kinds of noise interfere to the electric network and discuss the harm of the disturbance to the electric network from the point of the theory of the switching mode power supply. After the discussion of the electronic and component cause of switching mode power supply we supply with some corresponding depressed methods such as the electrical isolation technology, grounding technology, filtering technology, the PCB technology, the method of placing line and so on. At last we discuss the soft switch technology and the frequency-modulation technology that are controversial now. In addition, the computation method about inducer, and capacitance, the design of department about the high frequency capacitance, the choice and setting principle about filters have been introduced detailed in the design of amplifiers filters and so on .

Keywords: Switching Power Supply；class-D Amplifier ；the design of reliability；the ways Of the contain