半桥式开关电源设计

半橋式開關電源設計

摘要

随着电子技术的高速发展,电子系统的应用领域越来越广,电子设备的种类也越来越多,电子设备与我们的工作、生活的关系日益密切。近年来 ,随着功率电子器件(如IGBT、MOSFET)、PWM技术以及电源理论的快速发展 ,新一代的电源电路开始逐步取代传统的电源电路。该电源电路具有体积小，控制灵活方便，输出特性好、纹波小、负载调整率高等显著优点。

由于開關電源中的功率調整管工作在開關狀態，具有功耗小、效率高、穩壓范圍寬、溫升低、體積小等突出優點，因此在通信設備、數控裝置、儀器儀表、視頻音響、家用電器等電

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子電路中得到廣泛應用。開關電源的高頻變換電路形式很多, 常用的變換電路有推挽、全橋、半橋、單端正激式和單端反激式等形式。本論文采用雙端驅動集成電路——TL494輸的PWM 脈沖控制器設計音響設備供電電源，利用BJT管作為開關管，可以提高電源變壓器的工作效率，有利于抑制脈沖干擾，同時還可以減小電源變壓器的體積。

關鍵詞：TL494，PWM，半橋式電路，開關電源

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Design of Half Bridge Switching Power Supply

ABSTRACT

With the rapid development of electronic technology, electronic systems, more and more extensive applications, the types of electronic equipment, more and more electronic equipment and people work and live closer and closer. In recent years, with the power electronic devices (such as IGBT, MOSFET), PWM switching power supply technology and development of the theory, a new generation of power began to gradually replace the traditional power supply circuits. The circuit is small,

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flexible to control the output characteristics of a good, ripple, load adjustment rate and so on.

Switching power supply in the power adjustment control work in the off state, with low power consumption, high efficiency, wide voltage range, low temperature rise, and other outstanding advantages of small size, the communication equipment, CNC equipment, Instrumentation, video audio, home appliances so widely used in electronic circuits. High frequency converter switching power supply so many forms of commonly used with push-pull converter, full bridge, half bridge, single-ended forward and the form of single-ended flyback. In this

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thesis, two-side driver IC - TL494 PWM pulse output of the controller design car audio power supply in use as a switch MOSFET, can improve the efficiency of the power transformer, is conducive to impulse noise suppression, but also can reduce the size of the power transformer.

KEY WORDS: TL494, PWM, Half bridge circuit, Switching power

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目錄

前言 (1)

第1章開關電源基礎技術 (2)

1.1 開關電源概述 (2)

1.1.1 開關電源的工作原理 (2)

1.1.2 開關電源的構成 (3)

1.1.3 開關電源的特點 (4)

1.2 開關電源典型結構 (4)

1.2.1 串聯開關電源結構 (4)

1.2.2并聯開關電源結構 (5)

1.2.3 正激式結構 (6)

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1.2.4 反激式結構 (7)

1.2.5 半橋型結構 (8)

1.2.6 全橋型結構 (9)

1.3 開關電源的技術指標 (10)

第2章半橋變換電路 (12)

2.1 半橋變換電路工作原理 (12)

2.2 半橋變換電路的應用 (13)

2.3 半橋變換電路中應注意的問題 (14)

2.3.1 偏磁問題 (15)

2.3.2 用作橋臂的兩個電容選用問題 (15)

2.3.3直通問題 (16)

2.3.4 半橋電路的驅動問題 (17)

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