描述
B类放大器
由于晶体管起始导通电压值的存在及起始导通的非线性,B类放大器存在着交越失真,这在高质量的HI-FI放大领域显然是不允许的。所以,常将推挽式电路的两个晶体管均施加少量偏置,使其导通角略大于1800,可避免产生交越失真。这种电路,导通角介于A类和B类之间,称为AB类(甲乙类)放大器oAB类电路的效率要低于B类,只有60%~70%。但因其兼顾了A类与B类的优点(低失真、高效率),故目前得到了广泛的应用。
AB类放大器
甲乙类放大器即末级放大管工作在甲乙类状态的放大器。也叫AB类放大器。AB类属于传统的功放。也是大多数功放的类型。从功率上看,甲乙类的功率数值一般较大。但并不总是工作在最大输出功率的状态,尽管放大类型比起纯A类有所不如,只要经过高水平的调试和校音,甲乙类放大器也可以发出美妙动人的音色。无数HIFI厂商已经用事实证明了这点。
C类放大器
在输入信号超过偏置点时才有电流流过晶体管(即导通角小于1800),这种放大器被称为C类(丙类)放大器C类放大器的效率更高,但其电流波形失真太大,因而不能用于Hi-Fi放大,只能用于采用高Q值调谐回路作为负载的谐振功率放大。由于调谐回路具有滤波能力,回路电流与电压仍然接近于正弦波形,失真很小。
D类放大器
D类功放指的是D类音频功率放大器(有时也称为数字功放)。通过控制开关单元的ON/OFF,驱动扬声器的放大器称D类放大器。D类放大器首次提出于1958年,近些年已逐渐流行起来。与一般的线性AB类功放电路相比,D类功放有效率高、体积小等特点。
从A、B、C类放大器的特性可知,影响放大器效率的主要原因是无信号时的直流功耗。工作于脉冲放大状态的D类(J类)放大器,其工作状态为开关放大,效率极高,理论上可达100%,实际上由于器件未达到理想状态,效率只能达到80%。95%,但这也是放大器中具有的最高效率。由于D类功放的效率高,无功损耗小,故散热器体积也可用的较小,变压器也不必用的那么巨大,使功放的体积、重量及成本大幅度下降,符合人们对新一代功放高效率、轻量化的追求。
D类放大器与A类和AB类放大器不同。后者接收的是模拟信号进行放大,前者则不一定。技术上是存在几种不同做法的。 既有全程数字化的“全数字放大器”(只有数字输入端子,无模拟输入端),也有半程数字的“半数字化放大器”。(带有模拟输入端子)
D类功放是放大元件处于开关工作状态的一种放大模式。无信号输入时放大器处于截止状态,不耗电。工作时,靠输入信号让晶体管进入饱和状态,晶体管相当于一个接通的开关,把电源与负载直接接通。理想晶体管因为没有饱和压降而不耗电,实际上晶体管总会有很小的饱和压降而消耗部分电能。这种耗电只与晶体管特性有关,而与信号输出的大小无关,所以特别有利于超大功率的场合。
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