Abstract
Recently, the power amplifiers using semi-conductor switching elements are employed widely in industries, because they have more advantages than the conventional rotating amplifier, magnetic amplifier, etc. In such power amplifiers, the power converters with switching operation (chopper, inverter, converter and cycloconverter) can be incorporated so that the desirable amplifying characteristics may be achieved by an adequate control of switching.
In this paper, we deal with the bridge type power amplifier, because this is simple in the construction and is often used for the power amplification. For the purpose of linear amplification, we study the operation time and the logical functions of the switches when the source voltage in this amplifier is an arbitrary function of time.
Moreover, an output filteris necessary to obtain the desirable wave form of the output voltage, therefore, we analyze the wave form of the instantaneous output voltage and examine the results. We can obtain the design specifications of the filter from these results.
As stated above, the purpose of this paper is to establish a general theory of amplification by assuming that the source voltage is a time variable.
