LOW FREQUENCY KEY AMPLIFICATION CHANNEL Russian patent published in 2024 - IPC H03F3/217 

FIELD: amplifier and generator equipment.

SUBSTANCE: used in broadband transmission paths of the audio frequency range for radio broadcasting and hydroacoustic communications. For this purpose, a low-frequency key amplification channel is proposed, containing a pulse-width converter 1 (PW Converter 1), a key power amplifier 2 (KPA 2), a current sensor 3, a threshold feedback circuit 4, an adder 5, a rectifier 6 and a parallel RC circuit 7. In turn, the threshold feedback circuit 4 includes operational amplifiers 4.1 and 4.2, bus of reference voltage 4.3 U_o and diodes 4.4, 4.5.

EFFECT: limiting the amplitude of the output current under overload conditions when operating on a predominantly capacitive load by no more than 20% of the specified limit value with at least a twofold reduction in the harmonic distortion of the amplified signal, which can significantly increase the reliability of operation.

1 cl, 4 dwg