准互补推挽电路图.ewb

Multisim2001软件的仿真电路实例261例

Electronics Workbench Circuit File
Version: 5
Charset: ANSI
Description: 
"准互补推挽电路图" 
"	互补推挽输出级的两个器件，具有不同导电型，为了输出波形对称，两个管子的特性应该尽可能对称。但由于工艺上的原因，导电型不同的大功率管，难以做到特性对称，在大功率输出电路中，采用复合管互补对称电路。在这种电路中，输出的一对管子采用同一导电型的PNP或NPN管，互补工作则由驱动输出管的一对小功率的具有相反导电型的PNP或NPN管来完成，故此种电路称为准互补推挽电路。" 
"	复合管有两种连接方式：一种是相同导电型的器件进行复合连接，另一种是不同导电型的器件进行复合连接。两个相同导电型的器件复合，仍为原导电型，而两个不同导电型器件进行复合连接后，其导电型取决于驱动管。这种复合管在许多资料中也被称为达林顿管。" 
"	图中VT1、VT2为输出管，VT3、VT4为驱动管，RE3和RE1的接入是为了均衡推挽两臂的输入电阻。VT5及其偏流电阻R1、R2用来使输出级得到合适的静态工作点，调节R1和R2之比，可以改变输出级静态电流的大小。电阻R1同时从VT5的集电极获取一电压负反馈，使VT5集— 射极之间的交流电阻（VT5的等效输出电阻）很小，以保证输出级推挽两臂有十分接近的推动电压。VT6为前置放大管，电流源I是其集电极有源负载。" 
"	" 

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