公开(公告)号：US20180367107A1

公开(公告)日：2018-12-20

申请号：US15991321

申请日：2018-05-29

Applicant: ICEpower A/S

Inventor： Patrik BOSTRÖM ,  Martin PERSSON

IPC: H03F3/217 ,  H03F1/02 ,  H03F1/08

CPC classification number: H03F3/2171 ,  H03F3/183 ,  H03F2200/03

Abstract: A new and improved self-oscillating amplifier system is presented, suitable for use in high fidelity audio applications. The self-oscillating amplifier system comprises a feedback path and a forward path including a pulse modulator, a switching power amplification stage and a demodulation filter. The forward path further includes a pair of parallel forward filters preceding the pulse modulators, a differentiating forward filter and an integrating forward filter. The differentiating forward filter is utilized for controlling a switching frequency of the system while the integrating forward filter is utilized for controlling the behavior of the amplifier system within an operating frequency band (e.g. audio band). The self-oscillating amplifier system exhibits improved performance in terms of open loop gain, reduced phase turn and improved robustness as compared to other previously known self-oscillating amplifier systems.