| 摘要 |
<p>1. Low-frequency power amplifier having a pulse modulator (10) which converts a low-frequency input signal into at least two phase-shifted pulse sequences (E1 , E2 ) with identical frequency and containing width-modulated pulses, and at least two switching stages (11, 13) which are controlled by the pulse sequences and the supply-voltage inputs (38, 39) of which are connected in parallel, and a low-pass filter (17) which follows the switching stages in the circuit and at the output of which the power-amplified low-frequency signal appears, characterised in that the phase shift between the pulse sequences (E1 , E2 ) is 180 degrees, and the outputs (44, 45) of the switching stages (11, 13) are electrically isolated from the supply-voltage inputs (38, 39) and are connected in series for the purpose of summing the output voltage.</p> |
