公开(公告)号：US3828207A

公开(公告)日：1974-08-06

申请号：US36767673

申请日：1973-06-06

Applicant: BENDIX CORP

Inventor： SHAW B

IPC: H03K5/02 ,  H03K17/60

CPC classification number: H03K5/02

Abstract: A high power, high efficiency transistor amplifier is disclosed having an input drive signal in the form of a square wave with a square wave or saturated voltage output. This amplifier drives a tuned or reactive load with the result that the output current wave form is sinusoidal or some form other than a square wave. A current transformer or other current sensing device is connected into the output circuit, and a portion of the output current is fed back to the input in such sense that resulting sinusoidal voltage pulses are added to each square wave input pulse. Where the output transistors are connected in push-pull in a grounded emitter configuration, resistors are normally connected in the emitter circuit. A sinusoidal voltage is developed across these resistors which subtracts from the input drive square wave voltage pulses. This results in a degradation in the drive signal which may cause the output transistors to drop out of saturation which then causes them to try to deliver excessive power with resulting danger of burning them out. By feeding back a sinusoidal voltage which is added to the base drive, saturation is maintained throughout the length of the drive pulse. In another embodiment a plurality of identical amplifiers are connected into a common output such that their square wave voltage output signals are displaced slightly in time and algebraically added to produce a sine wave synthesis output signal across the load which, in this case, may be either reactive or resistive. A similar current sensing or voltage sensing device connected into the load circuit provides a similar feedback signal to each amplifier to assure saturation.

Abstract translation: 公开了一种具有方波或饱和电压输出的方波形式的输入驱动信号的高功率，高效率晶体管放大器。 该放大器驱动调谐或无功负载，结果是输出电流波形为正弦波或除方波之外的某种形式。 电流互感器或其他电流感测装置连接到输出电路中，并且输出电流的一部分被反馈到输入端，使得所得到的正弦电压脉冲被加到每个方波输入脉冲。 在输出晶体管以接地发射极配置的推挽式连接的情况下，电阻通常连接在发射极电路中。 在这些电阻器之间产生正弦电压，从输入驱动方波电压脉冲中减去正弦电压。 这导致驱动信号的劣化，这可能导致输出晶体管脱落饱和，从而使它们尝试传递过多的功率，从而导致其被烧毁的危险。 通过反馈添加到基极驱动器的正弦电压，在驱动脉冲的整个长度内保持饱和。 在另一个实施例中，多个相同的放大器被连接到公共输出中，使得它们的方波电压输出信号在时间上稍微偏移并且被代数相加以产生横跨负载的正弦波合成输出信号，在这种情况下，这可以是 反应性或电阻性。 连接到负载电路中的类似的电流感测或电压感测装置为每个放大器提供类似的反馈信号以确保饱和。