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在功率放大器中,无输出变压器的单端推挽电路(OTL)和无输出电容器的单端推挽电路(OCL)用得比较多,如果把两个推挽电路并联起来,将负载R _L跨接在两个推挽电路的输出端之间,就构成了一个桥式推挽电路,其原理电路如图1所示。 桥式推挽电路在工作时,两个输入端A、B加入大小相等,相位相反的输入信号。当A端为正半周、B端为负半周时,晶体管VT1、VT4导通,VT2、VT3截止,电流方向如图1中实线所示;当B端为正半周,A端为负半周时,VT3、VT2导通,VT1、VT4截止,电流方向如图1中虚线所示。这种电路既保持了推挽电
In power amplifiers, single-ended push-pull circuits (OTLs) without output transformers and single-ended push-pull circuits with output capacitors (OCLs) are more used. If two push-pull circuits are connected in parallel, Connected between the output of the two push-pull circuit, constitute a bridge push-pull circuit, the principle circuit shown in Figure 1. Bridge push-pull circuit at work, the two inputs A, B to join the same size, the opposite phase of the input signal. When the A terminal is a positive half-cycle, the B-terminal negative half-cycle, the transistor VT1, VT4 turn, VT2, VT3 ends, the current direction shown in Figure 1 solid line shows; , VT3, VT2 conduction, VT1, VT4 ends, the current direction shown in Figure 1 dotted line. This circuit retains the push-pull