SWITCHING AMPLIFIER AND METHOD OF TREATING WAVEFORM

摘要

PURPOSE: To obtain high efficiency when a load is inductive by inverting input to one of two modulators and coupling a push-pull bridge output switching circuit with the outputs of the modulators, and coupling a load between 1st and 2nd terminals of a bridge. CONSTITUTION: A triangular wave generator 16 is combined with a clock oscillator 14 to generate a triangular waveform. An amplified electric input signal is inputted from an input port 30 to the negative input of a comparator 22 through the negative input of a comparator 20 and an inverter 28. The comparators 20 and 22 receive the same comparison waveform from the generator 16. The pulse-width modulated pulse signal S1 from the comparator 20 is coupled with a 1st switching element 36 and the pulse-width modulator pulse train S2 from the comparator 22 is coupled with a 2nd switching element 40. The elements 36 and 40 form a 4-element push-pull output bridge. The elements 36 and 40 have the same constitution and are equipped with transistor switches 44 and 46 and an inverter 42, an output signal is generated between conduction members 50 and 52, and the load L can be connected between them.