【摘要】：D類音頻放大器的概念在1958年就已經(jīng)提出了,而直到功率半導(dǎo)體的崛起,才使得其迅速占領(lǐng)音頻設(shè)備市場。D類音頻放大器設(shè)計技術(shù)的不斷改善,其性能指標(biāo)逐步上升,以效率高、體積小、節(jié)能和數(shù)字化等優(yōu)點不斷取代傳統(tǒng)音頻技術(shù),滿足了更多人的需求。本文從輔助電源、驅(qū)動電路、輸出級電路、保護電路及濾波電路等方面,詳細設(shè)計了一款500W D類音頻放大器。工作內(nèi)容主要包括以下幾個方面:1.首先比較了幾種傳統(tǒng)音頻技術(shù)和D類功放之間的優(yōu)缺點,并且詳細描述了D類音頻放大器的工作原理。闡述了幾種D類放大器的調(diào)制方式及輸出級電路,在此基礎(chǔ)上提出本文的系統(tǒng)結(jié)構(gòu),其中著重解釋Δ-Σ調(diào)制技術(shù)在D類音頻放大器中的重要作用。2.設(shè)計D類音頻放大器的核心電路及電源輔助電路。其中核心電路包括積分器、驅(qū)動電路、輸出級電路、濾波電路和保護電路等。一方面,選擇合適的控制芯片和功率元件,特別是功率元件采用實驗室設(shè)計的MOSFET;另一方面需要對電路的參數(shù)進行詳細設(shè)計以使得電路性能達到最優(yōu)。輔助電路采用開關(guān)電源,為功放提供必要的供電。3.設(shè)計PCB版圖,搭建出實際的電路并且進行調(diào)試。借助實驗室的相關(guān)設(shè)備,對設(shè)計出來的電路在實際應(yīng)用的環(huán)境下進行測試。包括輔助電源模塊,D類音頻放大模塊以及整體的性能,調(diào)試相關(guān)參數(shù)使得測試結(jié)果達到最優(yōu)。測試結(jié)果表明,所設(shè)計的D類音頻放大器,在帶載8Ω的情況下,功率為556W,空載情況下為16W。在選用輸入峰峰值為2V,頻率為1.7KHz的正弦信號時,測試輸出為峰峰值為84.8V,頻率為1.7KHz的正弦信號,信號被放大了約42.4倍,且?guī)缀鯚o失真發(fā)生,基本滿足設(shè)計要求。此外,對電路調(diào)試中出現(xiàn)的功率器件失效問題進行了分析與討論,并且給出了相應(yīng)的解決措施。
[Abstract]:The concept of class D audio amplifier was put forward in 1958, but it was not until the rise of power semiconductor that it rapidly occupied the market of audio equipment. The design technology of class D audio amplifier improved continuously, and its performance index gradually increased. With the advantages of high efficiency, small size, energy saving and digitization, traditional audio technology has been replaced to meet the needs of more people. In this paper, a 500W D audio amplifier is designed in detail from the aspects of auxiliary power supply, drive circuit, output stage circuit, protection circuit and filter circuit. The work includes the following aspects: 1. Firstly, the advantages and disadvantages between several traditional audio technologies and D type power amplifier are compared, and the working principle of D class audio amplifier is described in detail. In this paper, several modulation modes and output stage circuits of class D amplifiers are described. Based on these, the system structure of this paper is presented, and the important role of 螖 危 modulation technology in class D audio amplifiers is explained emphatically. The core circuit and power supply auxiliary circuit of class D audio amplifier are designed. The core circuits include integrator, drive circuit, output circuit, filter circuit and protection circuit. On the one hand, appropriate control chips and power elements are selected, especially the power elements are designed by MOSFETs designed in laboratory; on the other hand, detailed design of circuit parameters is needed to optimize the circuit performance. Auxiliary circuit uses switching power supply to provide the necessary power supply. 3. PCB layout design, build the actual circuit and debugging. With the help of laboratory equipment, the designed circuit is tested in practical application environment. It includes the auxiliary power module and the audio amplifier module of D class, and the whole performance. The test results are optimized by debugging the relevant parameters. The test results show that the power of the class D audio amplifier is 556 W in the case of 8 惟 load and 16 W in the case of no load. When the input peak value is 2 V and the frequency is 1.7 kHz, the test output is a sine signal with a peak of 84.8 V and a frequency of 1.7 kHz. The signal is amplified by about 42.4 times and has almost no distortion, which basically meets the design requirements. In addition, the failure problem of power devices in circuit debugging is analyzed and discussed, and the corresponding solutions are given.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN912.2

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