模拟电子技术基础学习笔记(九)
目录
摘要
模拟电子技术基础学习笔记(九)。
崔叉叉注
如果要100%理解并掌握这门课的内容,尤其是电路的分析与计算部分,需要基本电路理论这门课作为前置知识。否则不需要。
9 功率放大电路
9.1 概述
9.1.1 电路特点
- 主要指标
- 最大输出功率Pom:负载可获得的最大交流功率。
- 功率(η)= Pom / P直流。
- 晶体管:考虑极限值。
9.1.2 电路的组成
-
共射放大电路做功放电路:
共射放大电路做功放电路1 共射放大电路做功放电路2 -
变压器耦合
变压器耦合功率放大1 变压器耦合功率放大2 -
OTL电路
OTL电路1 OTL电路2 -
OCL电路
OCL电路 -
BTL电路
BTL电路
9.2 OCL电路
9.2.1 组成
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9.2.2 输出功率与效率
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9.2.3 晶体管的选择
10 直流电源
10.1 组成及各部分作用
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10.2 整流电路
10.2.1 单相半波整流电路
10.2.2 单相桥式整流电路
-
工作原理
单相桥式整流电路 单相桥式整流电路画法 单相桥式整流电路波形 -
主要参数
主要参数 -
二极管的选择:与单相半波整流电路相同。
利用单相桥式整流电路实现正负电源 -
三相整流电路
三相整流电路及其波形 - 可以输出比较大的功率
- 得到很小的脉动系数
10.3 滤波电路
10.3.1 电容滤波
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10.3.2 倍压整流电路
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10.3.4 其他滤波电路
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10.4 稳压管稳压电路
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-
工作原理
工作原理 -
稳压系数
稳压系数 -
参数选择
- UI = (2 ~ 3) * U0
- 稳压管:
- Uz = U0
- 负载电流的变化范围一定要在稳压电流的变化范围之内。
- 限流电阻R:让Iz工作在Izmax和Izmin之间。
10.5 串联型稳压电路
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10.6 开关电源
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