Switching amplifier

Abstract

Abstract 1. Claims for the contraction states DE and GB Switching amplifier for analog LF signals, having an A/D converter (11) which converts the analog LF signal into at least two pulse sequences, and at least two amplifier states (42, 44, 45), each of which contains a transformer (20) the primary winding (21) of which is connected to a voltage source and the secondary winding of which is connected to a cascaded diode circuit, and at least one switching element, which is controlled by the pulse sequence, for the current to be transferred from the voltage source to the cascaded diode circuit, and a low-pass filter which is connected to the cascaded diode circuit, characterised in that the primary winding (21) of the transformer (20) is connected to an alternating-voltage source (22) and the amplifier stage (43, 44, 45) contains a rectifier circuit (27, 31, 35; 28, 32, 36; 29, 33, 37) which is connected to the secondary winding (23, 24, 25) of the transformer (20), that the rectifier circuit (27, 31, 35; 28, 32, 36; 29, 33, 37) is provided with at least two outputs, one of which is connected to the cascaded diode circuit (47) via the switching element (39, 40, 41) and the other one of which is directly connected to the cascaded diode circuit (47), and between the two connecting points at least one diode (50, 49, 48) is provided and that the transformers of the amplifier stages (43, 44, 45) are combined into one transformer (20) having a primary winding (21) and a number of secondary windings (23, 24, 25) which corresponds to the number of amplifier stages (43, 44, 45). 1. Claims Switching amplifier for analog LF signals, comprising an A/D converter (11) which converts the analog LF signal into at least two pulse sequences, and comprising at least two amplifier stages (43, 44, 45), each of which contains one transformer (20), the primary winding (21) of which is connected to a voltage source and the secondary winding of which is connected to a diode cascade, and contains at least one switching element, controlled by the pulse sequence, for the current to be transferred from the voltage source to the diode cascade, and comprising a lowpass filter which is connected to the diode cascade, characterised in that the primary winding (21) of the transformer (20) is connected to an alternating-voltage source (22) and the amplifier stage (43, 44, 45) contains a rectifier circuit (27, 31, 35; 28, 32, 36; 29, 33, 37) which is connected to the secondary winding (23, 24, 25) of the transformer (20), and that the rectifier circuit (27, 31, 35; 28, 32, 36; 29, 33, 37) is provided with at least two outputs, one of which is connected to the diode cascade (47) via the switching element (39, 40, 41) and the other one of which is connected directly to the diode cascade (47) and that between the two connection points at least one diode (50, 49, 48) is provided.

Inventors

• 👤 Andreas Furrer

Bibliographic Details