Electronic ringing signal generator.

摘要

A switching power amplifier circuit has the functions of a power inverter and a switching amplifier embodied into one integral circuit. Two high frequency switching inverter circuits (101, 102) are connected back to back sharing the same inverter power transformer (110). One switching inverter circuit (101) processes power from an input rail to an output capacitor (117) while the other switching inverter (102) circuit processes power from the output capacitor to the input rail. The output capacitor voltage is regulated with respect to a signal input in order to obtain the desired output signal waveform. A blocking capacitor (125) in the output absorbs the DC component of the output capacitor voltage and allows a pure AC ringing signal to be applied to the load. In an application as a ringing generator circuit the signal input is supplied by a ringing signal oscillator circuit (160).