公开(公告)号：US20240243704A1

公开(公告)日：2024-07-18

申请号：US18562680

申请日：2022-06-02

Applicant: ICEPOWER A/S

Inventor： Patrik BOSTRÖM

IPC: H03F3/183

CPC classification number: H03F3/183 ,  H03F2200/03 ,  H03F2200/171

Abstract: A self-oscillating amplifier system comprising at least two integrator stages connected to receive an input signal and provide a reference signal, a comparator configured to provide a modulation signal based on the reference 5 signal and a modulation feedback signal, and a switching stage connected to form a switching output signal. The system further comprises a voltage limiting circuit connected between the input signal and the reference signal, for limiting a voltage across the at least two integrator stages. By connecting one single voltage limiting circuit across all integrator stages, the modulation signal will be limited to the voltage limit of this voltage limiting circuit.

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.